diff options
Diffstat (limited to 'fs/btrfs/tree-log.c')
| -rw-r--r-- | fs/btrfs/tree-log.c | 4830 |
1 files changed, 2958 insertions, 1872 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 7dd7552f53a4..813986e38258 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -17,7 +17,12 @@ #include "backref.h" #include "compression.h" #include "qgroup.h" -#include "inode-map.h" +#include "block-group.h" +#include "space-info.h" +#include "zoned.h" +#include "inode-item.h" + +#define MAX_CONFLICT_INODES 10 /* magic values for the inode_only field in btrfs_log_inode: * @@ -28,8 +33,6 @@ enum { LOG_INODE_ALL, LOG_INODE_EXISTS, - LOG_OTHER_INODE, - LOG_OTHER_INODE_ALL, }; /* @@ -92,10 +95,8 @@ enum { }; static int btrfs_log_inode(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, + struct btrfs_inode *inode, int inode_only, - const loff_t start, - const loff_t end, struct btrfs_log_ctx *ctx); static int link_to_fixup_dir(struct btrfs_trans_handle *trans, struct btrfs_root *root, @@ -105,6 +106,7 @@ static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, struct btrfs_root *log, struct btrfs_path *path, u64 dirid, int del_all); +static void wait_log_commit(struct btrfs_root *root, int transid); /* * tree logging is a special write ahead log used to make sure that @@ -139,16 +141,45 @@ static int start_log_trans(struct btrfs_trans_handle *trans, struct btrfs_log_ctx *ctx) { struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_root *tree_root = fs_info->tree_root; + const bool zoned = btrfs_is_zoned(fs_info); int ret = 0; + bool created = false; + + /* + * First check if the log root tree was already created. If not, create + * it before locking the root's log_mutex, just to keep lockdep happy. + */ + if (!test_bit(BTRFS_ROOT_HAS_LOG_TREE, &tree_root->state)) { + mutex_lock(&tree_root->log_mutex); + if (!fs_info->log_root_tree) { + ret = btrfs_init_log_root_tree(trans, fs_info); + if (!ret) { + set_bit(BTRFS_ROOT_HAS_LOG_TREE, &tree_root->state); + created = true; + } + } + mutex_unlock(&tree_root->log_mutex); + if (ret) + return ret; + } mutex_lock(&root->log_mutex); +again: if (root->log_root) { + int index = (root->log_transid + 1) % 2; + if (btrfs_need_log_full_commit(trans)) { - ret = -EAGAIN; + ret = BTRFS_LOG_FORCE_COMMIT; goto out; } + if (zoned && atomic_read(&root->log_commit[index])) { + wait_log_commit(root, root->log_transid - 1); + goto again; + } + if (!root->log_start_pid) { clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); root->log_start_pid = current->pid; @@ -156,24 +187,28 @@ static int start_log_trans(struct btrfs_trans_handle *trans, set_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); } } else { - mutex_lock(&fs_info->tree_log_mutex); - if (!fs_info->log_root_tree) - ret = btrfs_init_log_root_tree(trans, fs_info); - mutex_unlock(&fs_info->tree_log_mutex); - if (ret) + /* + * This means fs_info->log_root_tree was already created + * for some other FS trees. Do the full commit not to mix + * nodes from multiple log transactions to do sequential + * writing. + */ + if (zoned && !created) { + ret = BTRFS_LOG_FORCE_COMMIT; goto out; + } ret = btrfs_add_log_tree(trans, root); if (ret) goto out; + set_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state); clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); root->log_start_pid = current->pid; } - atomic_inc(&root->log_batch); atomic_inc(&root->log_writers); - if (ctx) { + if (!ctx->logging_new_name) { int index = root->log_transid % 2; list_add_tail(&ctx->list, &root->log_ctxs[index]); ctx->log_transid = root->log_transid; @@ -191,11 +226,22 @@ out: */ static int join_running_log_trans(struct btrfs_root *root) { + const bool zoned = btrfs_is_zoned(root->fs_info); int ret = -ENOENT; + if (!test_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state)) + return ret; + mutex_lock(&root->log_mutex); +again: if (root->log_root) { + int index = (root->log_transid + 1) % 2; + ret = 0; + if (zoned && atomic_read(&root->log_commit[index])) { + wait_log_commit(root, root->log_transid - 1); + goto again; + } atomic_inc(&root->log_writers); } mutex_unlock(&root->log_mutex); @@ -209,9 +255,7 @@ static int join_running_log_trans(struct btrfs_root *root) */ void btrfs_pin_log_trans(struct btrfs_root *root) { - mutex_lock(&root->log_mutex); atomic_inc(&root->log_writers); - mutex_unlock(&root->log_mutex); } /* @@ -226,12 +270,6 @@ void btrfs_end_log_trans(struct btrfs_root *root) } } -static int btrfs_write_tree_block(struct extent_buffer *buf) -{ - return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start, - buf->start + buf->len - 1); -} - static void btrfs_wait_tree_block_writeback(struct extent_buffer *buf) { filemap_fdatawait_range(buf->pages[0]->mapping, @@ -250,16 +288,6 @@ struct walk_control { */ int free; - /* should we write out the extent buffer? This is used - * while flushing the log tree to disk during a sync - */ - int write; - - /* should we wait for the extent buffer io to finish? Also used - * while flushing the log tree to disk for a sync - */ - int wait; - /* pin only walk, we record which extents on disk belong to the * log trees */ @@ -305,45 +333,29 @@ static int process_one_buffer(struct btrfs_root *log, * pin down any logged extents, so we have to read the block. */ if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { - ret = btrfs_read_buffer(eb, gen, level, NULL); + ret = btrfs_read_extent_buffer(eb, gen, level, NULL); if (ret) return ret; } - if (wc->pin) - ret = btrfs_pin_extent_for_log_replay(fs_info, eb->start, + if (wc->pin) { + ret = btrfs_pin_extent_for_log_replay(wc->trans, eb->start, eb->len); + if (ret) + return ret; - if (!ret && btrfs_buffer_uptodate(eb, gen, 0)) { - if (wc->pin && btrfs_header_level(eb) == 0) + if (btrfs_buffer_uptodate(eb, gen, 0) && + btrfs_header_level(eb) == 0) ret = btrfs_exclude_logged_extents(eb); - if (wc->write) - btrfs_write_tree_block(eb); - if (wc->wait) - btrfs_wait_tree_block_writeback(eb); } return ret; } -/* - * Item overwrite used by replay and tree logging. eb, slot and key all refer - * to the src data we are copying out. - * - * root is the tree we are copying into, and path is a scratch - * path for use in this function (it should be released on entry and - * will be released on exit). - * - * If the key is already in the destination tree the existing item is - * overwritten. If the existing item isn't big enough, it is extended. - * If it is too large, it is truncated. - * - * If the key isn't in the destination yet, a new item is inserted. - */ -static noinline int overwrite_item(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, - struct extent_buffer *eb, int slot, - struct btrfs_key *key) +static int do_overwrite_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct extent_buffer *eb, int slot, + struct btrfs_key *key) { int ret; u32 item_size; @@ -357,18 +369,30 @@ static noinline int overwrite_item(struct btrfs_trans_handle *trans, if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) overwrite_root = 1; - item_size = btrfs_item_size_nr(eb, slot); + item_size = btrfs_item_size(eb, slot); src_ptr = btrfs_item_ptr_offset(eb, slot); - /* look for the key in the destination tree */ - ret = btrfs_search_slot(NULL, root, key, path, 0, 0); - if (ret < 0) - return ret; + /* Our caller must have done a search for the key for us. */ + ASSERT(path->nodes[0] != NULL); + + /* + * And the slot must point to the exact key or the slot where the key + * should be at (the first item with a key greater than 'key') + */ + if (path->slots[0] < btrfs_header_nritems(path->nodes[0])) { + struct btrfs_key found_key; + + btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); + ret = btrfs_comp_cpu_keys(&found_key, key); + ASSERT(ret >= 0); + } else { + ret = 1; + } if (ret == 0) { char *src_copy; char *dst_copy; - u32 dst_size = btrfs_item_size_nr(path->nodes[0], + u32 dst_size = btrfs_item_size(path->nodes[0], path->slots[0]); if (dst_size != item_size) goto insert; @@ -462,7 +486,7 @@ insert: /* make sure any existing item is the correct size */ if (ret == -EEXIST || ret == -EOVERFLOW) { u32 found_size; - found_size = btrfs_item_size_nr(path->nodes[0], + found_size = btrfs_item_size(path->nodes[0], path->slots[0]); if (found_size > item_size) btrfs_truncate_item(path, item_size, 1); @@ -503,13 +527,8 @@ insert: */ if (S_ISREG(btrfs_inode_mode(eb, src_item)) && S_ISREG(btrfs_inode_mode(dst_eb, dst_item)) && - ino_size != 0) { - struct btrfs_map_token token; - - btrfs_init_map_token(&token, dst_eb); - btrfs_set_token_inode_size(dst_eb, dst_item, - ino_size, &token); - } + ino_size != 0) + btrfs_set_inode_size(dst_eb, dst_item, ino_size); goto no_copy; } @@ -547,19 +566,45 @@ no_copy: } /* + * Item overwrite used by replay and tree logging. eb, slot and key all refer + * to the src data we are copying out. + * + * root is the tree we are copying into, and path is a scratch + * path for use in this function (it should be released on entry and + * will be released on exit). + * + * If the key is already in the destination tree the existing item is + * overwritten. If the existing item isn't big enough, it is extended. + * If it is too large, it is truncated. + * + * If the key isn't in the destination yet, a new item is inserted. + */ +static int overwrite_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct extent_buffer *eb, int slot, + struct btrfs_key *key) +{ + int ret; + + /* Look for the key in the destination tree. */ + ret = btrfs_search_slot(NULL, root, key, path, 0, 0); + if (ret < 0) + return ret; + + return do_overwrite_item(trans, root, path, eb, slot, key); +} + +/* * simple helper to read an inode off the disk from a given root * This can only be called for subvolume roots and not for the log */ static noinline struct inode *read_one_inode(struct btrfs_root *root, u64 objectid) { - struct btrfs_key key; struct inode *inode; - key.objectid = objectid; - key.type = BTRFS_INODE_ITEM_KEY; - key.offset = 0; - inode = btrfs_iget(root->fs_info->sb, &key, root); + inode = btrfs_iget(root->fs_info->sb, objectid, root); if (IS_ERR(inode)) inode = NULL; return inode; @@ -583,6 +628,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, struct extent_buffer *eb, int slot, struct btrfs_key *key) { + struct btrfs_drop_extents_args drop_args = { 0 }; struct btrfs_fs_info *fs_info = root->fs_info; int found_type; u64 extent_end; @@ -660,7 +706,10 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, btrfs_release_path(path); /* drop any overlapping extents */ - ret = btrfs_drop_extents(trans, root, inode, start, extent_end, 1); + drop_args.start = start; + drop_args.end = extent_end; + drop_args.drop_cache = true; + ret = btrfs_drop_extents(trans, root, BTRFS_I(inode), &drop_args); if (ret) goto out; @@ -715,13 +764,15 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, */ ret = btrfs_lookup_data_extent(fs_info, ins.objectid, ins.offset); - if (ret == 0) { + if (ret < 0) { + goto out; + } else if (ret == 0) { btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, ins.objectid, ins.offset, 0); btrfs_init_data_ref(&ref, root->root_key.objectid, - key->objectid, offset); + key->objectid, offset, 0, false); ret = btrfs_inc_extent_ref(trans, &ref); if (ret) goto out; @@ -750,7 +801,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, ret = btrfs_lookup_csums_range(root->log_root, csum_start, csum_end - 1, - &ordered_sums, 0); + &ordered_sums, 0, false); if (ret) goto out; /* @@ -804,17 +855,21 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, */ while (!list_empty(&ordered_sums)) { struct btrfs_ordered_sum *sums; + struct btrfs_root *csum_root; + sums = list_entry(ordered_sums.next, struct btrfs_ordered_sum, list); + csum_root = btrfs_csum_root(fs_info, + sums->bytenr); if (!ret) - ret = btrfs_del_csums(trans, - fs_info->csum_root, + ret = btrfs_del_csums(trans, csum_root, sums->bytenr, sums->len); if (!ret) ret = btrfs_csum_file_blocks(trans, - fs_info->csum_root, sums); + csum_root, + sums); list_del(&sums->list); kfree(sums); } @@ -830,15 +885,39 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, goto out; } - inode_add_bytes(inode, nbytes); + ret = btrfs_inode_set_file_extent_range(BTRFS_I(inode), start, + extent_end - start); + if (ret) + goto out; + update_inode: - ret = btrfs_update_inode(trans, root, inode); + btrfs_update_inode_bytes(BTRFS_I(inode), nbytes, drop_args.bytes_found); + ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); out: - if (inode) - iput(inode); + iput(inode); return ret; } +static int unlink_inode_for_log_replay(struct btrfs_trans_handle *trans, + struct btrfs_inode *dir, + struct btrfs_inode *inode, + const char *name, + int name_len) +{ + int ret; + + ret = btrfs_unlink_inode(trans, dir, inode, name, name_len); + if (ret) + return ret; + /* + * Whenever we need to check if a name exists or not, we check the + * fs/subvolume tree. So after an unlink we must run delayed items, so + * that future checks for a name during log replay see that the name + * does not exists anymore. + */ + return btrfs_run_delayed_items(trans); +} + /* * when cleaning up conflicts between the directory names in the * subvolume, directory names in the log and directory names in the @@ -848,11 +927,11 @@ out: * item */ static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_path *path, struct btrfs_inode *dir, struct btrfs_dir_item *di) { + struct btrfs_root *root = dir->root; struct inode *inode; char *name; int name_len; @@ -881,12 +960,8 @@ static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, if (ret) goto out; - ret = btrfs_unlink_inode(trans, root, dir, BTRFS_I(inode), name, + ret = unlink_inode_for_log_replay(trans, dir, BTRFS_I(inode), name, name_len); - if (ret) - goto out; - else - ret = btrfs_run_delayed_items(trans); out: kfree(name); iput(inode); @@ -894,9 +969,11 @@ out: } /* - * helper function to see if a given name and sequence number found - * in an inode back reference are already in a directory and correctly - * point to this inode + * See if a given name and sequence number found in an inode back reference are + * already in a directory and correctly point to this inode. + * + * Returns: < 0 on error, 0 if the directory entry does not exists and 1 if it + * exists. */ static noinline int inode_in_dir(struct btrfs_root *root, struct btrfs_path *path, @@ -905,29 +982,34 @@ static noinline int inode_in_dir(struct btrfs_root *root, { struct btrfs_dir_item *di; struct btrfs_key location; - int match = 0; + int ret = 0; di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, index, name, name_len, 0); - if (di && !IS_ERR(di)) { + if (IS_ERR(di)) { + ret = PTR_ERR(di); + goto out; + } else if (di) { btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); if (location.objectid != objectid) goto out; - } else + } else { goto out; - btrfs_release_path(path); + } + btrfs_release_path(path); di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); - if (di && !IS_ERR(di)) { - btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); - if (location.objectid != objectid) - goto out; - } else + if (IS_ERR(di)) { + ret = PTR_ERR(di); goto out; - match = 1; + } else if (di) { + btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); + if (location.objectid == objectid) + ret = 1; + } out: btrfs_release_path(path); - return match; + return ret; } /* @@ -981,8 +1063,7 @@ static inline int __add_inode_ref(struct btrfs_trans_handle *trans, struct btrfs_inode *dir, struct btrfs_inode *inode, u64 inode_objectid, u64 parent_objectid, - u64 ref_index, char *name, int namelen, - int *search_done) + u64 ref_index, char *name, int namelen) { int ret; char *victim_name; @@ -1016,7 +1097,7 @@ again: * otherwise they must be unlinked as a conflict */ ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); - ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); + ptr_end = ptr + btrfs_item_size(leaf, path->slots[0]); while (ptr < ptr_end) { victim_ref = (struct btrfs_inode_ref *)ptr; victim_name_len = btrfs_inode_ref_name_len(leaf, @@ -1039,27 +1120,17 @@ again: inc_nlink(&inode->vfs_inode); btrfs_release_path(path); - ret = btrfs_unlink_inode(trans, root, dir, inode, + ret = unlink_inode_for_log_replay(trans, dir, inode, victim_name, victim_name_len); kfree(victim_name); if (ret) return ret; - ret = btrfs_run_delayed_items(trans); - if (ret) - return ret; - *search_done = 1; goto again; } kfree(victim_name); ptr = (unsigned long)(victim_ref + 1) + victim_name_len; } - - /* - * NOTE: we have searched root tree and checked the - * corresponding ref, it does not need to check again. - */ - *search_done = 1; } btrfs_release_path(path); @@ -1067,7 +1138,9 @@ again: extref = btrfs_lookup_inode_extref(NULL, root, path, name, namelen, inode_objectid, parent_objectid, 0, 0); - if (!IS_ERR_OR_NULL(extref)) { + if (IS_ERR(extref)) { + return PTR_ERR(extref); + } else if (extref) { u32 item_size; u32 cur_offset = 0; unsigned long base; @@ -1075,7 +1148,7 @@ again: leaf = path->nodes[0]; - item_size = btrfs_item_size_nr(leaf, path->slots[0]); + item_size = btrfs_item_size(leaf, path->slots[0]); base = btrfs_item_ptr_offset(leaf, path->slots[0]); while (cur_offset < item_size) { @@ -1101,6 +1174,7 @@ again: parent_objectid, victim_name, victim_name_len); if (ret < 0) { + kfree(victim_name); return ret; } else if (!ret) { ret = -ENOENT; @@ -1110,35 +1184,32 @@ again: inc_nlink(&inode->vfs_inode); btrfs_release_path(path); - ret = btrfs_unlink_inode(trans, root, + ret = unlink_inode_for_log_replay(trans, BTRFS_I(victim_parent), inode, victim_name, victim_name_len); - if (!ret) - ret = btrfs_run_delayed_items( - trans); } iput(victim_parent); kfree(victim_name); if (ret) return ret; - *search_done = 1; goto again; } kfree(victim_name); next: cur_offset += victim_name_len + sizeof(*extref); } - *search_done = 1; } btrfs_release_path(path); /* look for a conflicting sequence number */ di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir), ref_index, name, namelen, 0); - if (di && !IS_ERR(di)) { - ret = drop_one_dir_item(trans, root, path, dir, di); + if (IS_ERR(di)) { + return PTR_ERR(di); + } else if (di) { + ret = drop_one_dir_item(trans, path, dir, di); if (ret) return ret; } @@ -1147,8 +1218,10 @@ next: /* look for a conflicting name */ di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir), name, namelen, 0); - if (di && !IS_ERR(di)) { - ret = drop_one_dir_item(trans, root, path, dir, di); + if (IS_ERR(di)) { + return PTR_ERR(di); + } else if (di) { + ret = drop_one_dir_item(trans, path, dir, di); if (ret) return ret; } @@ -1233,7 +1306,7 @@ again: eb = path->nodes[0]; ref_ptr = btrfs_item_ptr_offset(eb, path->slots[0]); - ref_end = ref_ptr + btrfs_item_size_nr(eb, path->slots[0]); + ref_end = ref_ptr + btrfs_item_size(eb, path->slots[0]); while (ref_ptr < ref_end) { char *name = NULL; int namelen; @@ -1268,7 +1341,7 @@ again: kfree(name); goto out; } - ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), + ret = unlink_inode_for_log_replay(trans, BTRFS_I(dir), inode, name, namelen); kfree(name); iput(dir); @@ -1290,106 +1363,6 @@ again: return ret; } -static int btrfs_inode_ref_exists(struct inode *inode, struct inode *dir, - const u8 ref_type, const char *name, - const int namelen) -{ - struct btrfs_key key; - struct btrfs_path *path; - const u64 parent_id = btrfs_ino(BTRFS_I(dir)); - int ret; - - path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; - - key.objectid = btrfs_ino(BTRFS_I(inode)); - key.type = ref_type; - if (key.type == BTRFS_INODE_REF_KEY) - key.offset = parent_id; - else - key.offset = btrfs_extref_hash(parent_id, name, namelen); - - ret = btrfs_search_slot(NULL, BTRFS_I(inode)->root, &key, path, 0, 0); - if (ret < 0) - goto out; - if (ret > 0) { - ret = 0; - goto out; - } - if (key.type == BTRFS_INODE_EXTREF_KEY) - ret = !!btrfs_find_name_in_ext_backref(path->nodes[0], - path->slots[0], parent_id, name, namelen); - else - ret = !!btrfs_find_name_in_backref(path->nodes[0], path->slots[0], - name, namelen); - -out: - btrfs_free_path(path); - return ret; -} - -static int add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct inode *dir, struct inode *inode, const char *name, - int namelen, u64 ref_index) -{ - struct btrfs_dir_item *dir_item; - struct btrfs_key key; - struct btrfs_path *path; - struct inode *other_inode = NULL; - int ret; - - path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; - - dir_item = btrfs_lookup_dir_item(NULL, root, path, - btrfs_ino(BTRFS_I(dir)), - name, namelen, 0); - if (!dir_item) { - btrfs_release_path(path); - goto add_link; - } else if (IS_ERR(dir_item)) { - ret = PTR_ERR(dir_item); - goto out; - } - - /* - * Our inode's dentry collides with the dentry of another inode which is - * in the log but not yet processed since it has a higher inode number. - * So delete that other dentry. - */ - btrfs_dir_item_key_to_cpu(path->nodes[0], dir_item, &key); - btrfs_release_path(path); - other_inode = read_one_inode(root, key.objectid); - if (!other_inode) { - ret = -ENOENT; - goto out; - } - ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), BTRFS_I(other_inode), - name, namelen); - if (ret) - goto out; - /* - * If we dropped the link count to 0, bump it so that later the iput() - * on the inode will not free it. We will fixup the link count later. - */ - if (other_inode->i_nlink == 0) - inc_nlink(other_inode); - - ret = btrfs_run_delayed_items(trans); - if (ret) - goto out; -add_link: - ret = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode), - name, namelen, 0, ref_index); -out: - iput(other_inode); - btrfs_free_path(path); - - return ret; -} - /* * replay one inode back reference item found in the log tree. * eb, slot and key refer to the buffer and key found in the log tree. @@ -1410,7 +1383,6 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans, char *name = NULL; int namelen; int ret; - int search_done = 0; int log_ref_ver = 0; u64 parent_objectid; u64 inode_objectid; @@ -1418,7 +1390,7 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans, int ref_struct_size; ref_ptr = btrfs_item_ptr_offset(eb, slot); - ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); + ref_end = ref_ptr + btrfs_item_size(eb, slot); if (key->type == BTRFS_INODE_EXTREF_KEY) { struct btrfs_inode_extref *r; @@ -1472,10 +1444,12 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans, if (ret) goto out; - /* if we already have a perfect match, we're done */ - if (!inode_in_dir(root, path, btrfs_ino(BTRFS_I(dir)), - btrfs_ino(BTRFS_I(inode)), ref_index, - name, namelen)) { + ret = inode_in_dir(root, path, btrfs_ino(BTRFS_I(dir)), + btrfs_ino(BTRFS_I(inode)), ref_index, + name, namelen); + if (ret < 0) { + goto out; + } else if (ret == 0) { /* * look for a conflicting back reference in the * metadata. if we find one we have to unlink that name @@ -1483,56 +1457,27 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans, * overwrite any existing back reference, and we don't * want to create dangling pointers in the directory. */ - - if (!search_done) { - ret = __add_inode_ref(trans, root, path, log, - BTRFS_I(dir), - BTRFS_I(inode), - inode_objectid, - parent_objectid, - ref_index, name, namelen, - &search_done); - if (ret) { - if (ret == 1) - ret = 0; - goto out; - } - } - - /* - * If a reference item already exists for this inode - * with the same parent and name, but different index, - * drop it and the corresponding directory index entries - * from the parent before adding the new reference item - * and dir index entries, otherwise we would fail with - * -EEXIST returned from btrfs_add_link() below. - */ - ret = btrfs_inode_ref_exists(inode, dir, key->type, - name, namelen); - if (ret > 0) { - ret = btrfs_unlink_inode(trans, root, - BTRFS_I(dir), - BTRFS_I(inode), - name, namelen); - /* - * If we dropped the link count to 0, bump it so - * that later the iput() on the inode will not - * free it. We will fixup the link count later. - */ - if (!ret && inode->i_nlink == 0) - inc_nlink(inode); - } - if (ret < 0) + ret = __add_inode_ref(trans, root, path, log, + BTRFS_I(dir), BTRFS_I(inode), + inode_objectid, parent_objectid, + ref_index, name, namelen); + if (ret) { + if (ret == 1) + ret = 0; goto out; + } /* insert our name */ - ret = add_link(trans, root, dir, inode, name, namelen, - ref_index); + ret = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode), + name, namelen, 0, ref_index); if (ret) goto out; - btrfs_update_inode(trans, root, inode); + ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); + if (ret) + goto out; } + /* Else, ret == 1, we already have a perfect match, we're done. */ ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen; kfree(name); @@ -1566,18 +1511,6 @@ out: return ret; } -static int insert_orphan_item(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 ino) -{ - int ret; - - ret = btrfs_insert_orphan_item(trans, root, ino); - if (ret == -EEXIST) - ret = 0; - - return ret; -} - static int count_inode_extrefs(struct btrfs_root *root, struct btrfs_inode *inode, struct btrfs_path *path) { @@ -1599,7 +1532,7 @@ static int count_inode_extrefs(struct btrfs_root *root, break; leaf = path->nodes[0]; - item_size = btrfs_item_size_nr(leaf, path->slots[0]); + item_size = btrfs_item_size(leaf, path->slots[0]); ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); cur_offset = 0; @@ -1653,7 +1586,7 @@ process_slot: key.type != BTRFS_INODE_REF_KEY) break; ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); - ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], + ptr_end = ptr + btrfs_item_size(path->nodes[0], path->slots[0]); while (ptr < ptr_end) { struct btrfs_inode_ref *ref; @@ -1718,7 +1651,9 @@ static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, if (nlink != inode->i_nlink) { set_nlink(inode, nlink); - btrfs_update_inode(trans, root, inode); + ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); + if (ret) + goto out; } BTRFS_I(inode)->index_cnt = (u64)-1; @@ -1729,7 +1664,9 @@ static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, if (ret) goto out; } - ret = insert_orphan_item(trans, root, ino); + ret = btrfs_insert_orphan_item(trans, root, ino); + if (ret == -EEXIST) + ret = 0; } out: @@ -1754,6 +1691,7 @@ static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, break; if (ret == 1) { + ret = 0; if (path->slots[0] == 0) break; path->slots[0]--; @@ -1766,17 +1704,19 @@ static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, ret = btrfs_del_item(trans, root, path); if (ret) - goto out; + break; btrfs_release_path(path); inode = read_one_inode(root, key.offset); - if (!inode) - return -EIO; + if (!inode) { + ret = -EIO; + break; + } ret = fixup_inode_link_count(trans, root, inode); iput(inode); if (ret) - goto out; + break; /* * fixup on a directory may create new entries, @@ -1785,8 +1725,6 @@ static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, */ key.offset = (u64)-1; } - ret = 0; -out: btrfs_release_path(path); return ret; } @@ -1822,11 +1760,9 @@ static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, set_nlink(inode, 1); else inc_nlink(inode); - ret = btrfs_update_inode(trans, root, inode); + ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); } else if (ret == -EEXIST) { ret = 0; - } else { - BUG(); /* Logic Error */ } iput(inode); @@ -1868,6 +1804,34 @@ static noinline int insert_one_name(struct btrfs_trans_handle *trans, return ret; } +static int delete_conflicting_dir_entry(struct btrfs_trans_handle *trans, + struct btrfs_inode *dir, + struct btrfs_path *path, + struct btrfs_dir_item *dst_di, + const struct btrfs_key *log_key, + u8 log_type, + bool exists) +{ + struct btrfs_key found_key; + + btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); + /* The existing dentry points to the same inode, don't delete it. */ + if (found_key.objectid == log_key->objectid && + found_key.type == log_key->type && + found_key.offset == log_key->offset && + btrfs_dir_type(path->nodes[0], dst_di) == log_type) + return 1; + + /* + * Don't drop the conflicting directory entry if the inode for the new + * entry doesn't exist. + */ + if (!exists) + return 0; + + return drop_one_dir_item(trans, path, dir, dst_di); +} + /* * take a single entry in a log directory item and replay it into * the subvolume. @@ -1893,14 +1857,17 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans, { char *name; int name_len; - struct btrfs_dir_item *dst_di; - struct btrfs_key found_key; + struct btrfs_dir_item *dir_dst_di; + struct btrfs_dir_item *index_dst_di; + bool dir_dst_matches = false; + bool index_dst_matches = false; struct btrfs_key log_key; + struct btrfs_key search_key; struct inode *dir; u8 log_type; - int exists; - int ret = 0; - bool update_size = (key->type == BTRFS_DIR_INDEX_KEY); + bool exists; + int ret; + bool update_size = true; bool name_added = false; dir = read_one_inode(root, key->objectid); @@ -1919,79 +1886,60 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans, name_len); btrfs_dir_item_key_to_cpu(eb, di, &log_key); - exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); - if (exists == 0) - exists = 1; - else - exists = 0; + ret = btrfs_lookup_inode(trans, root, path, &log_key, 0); btrfs_release_path(path); + if (ret < 0) + goto out; + exists = (ret == 0); + ret = 0; - if (key->type == BTRFS_DIR_ITEM_KEY) { - dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, - name, name_len, 1); - } else if (key->type == BTRFS_DIR_INDEX_KEY) { - dst_di = btrfs_lookup_dir_index_item(trans, root, path, - key->objectid, - key->offset, name, - name_len, 1); - } else { - /* Corruption */ - ret = -EINVAL; + dir_dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, + name, name_len, 1); + if (IS_ERR(dir_dst_di)) { + ret = PTR_ERR(dir_dst_di); goto out; - } - if (IS_ERR_OR_NULL(dst_di)) { - /* we need a sequence number to insert, so we only - * do inserts for the BTRFS_DIR_INDEX_KEY types - */ - if (key->type != BTRFS_DIR_INDEX_KEY) + } else if (dir_dst_di) { + ret = delete_conflicting_dir_entry(trans, BTRFS_I(dir), path, + dir_dst_di, &log_key, log_type, + exists); + if (ret < 0) goto out; - goto insert; + dir_dst_matches = (ret == 1); } - btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); - /* the existing item matches the logged item */ - if (found_key.objectid == log_key.objectid && - found_key.type == log_key.type && - found_key.offset == log_key.offset && - btrfs_dir_type(path->nodes[0], dst_di) == log_type) { - update_size = false; + btrfs_release_path(path); + + index_dst_di = btrfs_lookup_dir_index_item(trans, root, path, + key->objectid, key->offset, + name, name_len, 1); + if (IS_ERR(index_dst_di)) { + ret = PTR_ERR(index_dst_di); goto out; + } else if (index_dst_di) { + ret = delete_conflicting_dir_entry(trans, BTRFS_I(dir), path, + index_dst_di, &log_key, + log_type, exists); + if (ret < 0) + goto out; + index_dst_matches = (ret == 1); } - /* - * don't drop the conflicting directory entry if the inode - * for the new entry doesn't exist - */ - if (!exists) - goto out; + btrfs_release_path(path); - ret = drop_one_dir_item(trans, root, path, BTRFS_I(dir), dst_di); - if (ret) + if (dir_dst_matches && index_dst_matches) { + ret = 0; + update_size = false; goto out; - - if (key->type == BTRFS_DIR_INDEX_KEY) - goto insert; -out: - btrfs_release_path(path); - if (!ret && update_size) { - btrfs_i_size_write(BTRFS_I(dir), dir->i_size + name_len * 2); - ret = btrfs_update_inode(trans, root, dir); } - kfree(name); - iput(dir); - if (!ret && name_added) - ret = 1; - return ret; -insert: /* * Check if the inode reference exists in the log for the given name, * inode and parent inode */ - found_key.objectid = log_key.objectid; - found_key.type = BTRFS_INODE_REF_KEY; - found_key.offset = key->objectid; - ret = backref_in_log(root->log_root, &found_key, 0, name, name_len); + search_key.objectid = log_key.objectid; + search_key.type = BTRFS_INODE_REF_KEY; + search_key.offset = key->objectid; + ret = backref_in_log(root->log_root, &search_key, 0, name, name_len); if (ret < 0) { goto out; } else if (ret) { @@ -2001,10 +1949,10 @@ insert: goto out; } - found_key.objectid = log_key.objectid; - found_key.type = BTRFS_INODE_EXTREF_KEY; - found_key.offset = key->objectid; - ret = backref_in_log(root->log_root, &found_key, key->objectid, name, + search_key.objectid = log_key.objectid; + search_key.type = BTRFS_INODE_EXTREF_KEY; + search_key.offset = key->objectid; + ret = backref_in_log(root->log_root, &search_key, key->objectid, name, name_len); if (ret < 0) { goto out; @@ -2023,87 +1971,76 @@ insert: name_added = true; update_size = false; ret = 0; - goto out; + +out: + if (!ret && update_size) { + btrfs_i_size_write(BTRFS_I(dir), dir->i_size + name_len * 2); + ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); + } + kfree(name); + iput(dir); + if (!ret && name_added) + ret = 1; + return ret; } -/* - * find all the names in a directory item and reconcile them into - * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than - * one name in a directory item, but the same code gets used for - * both directory index types - */ +/* Replay one dir item from a BTRFS_DIR_INDEX_KEY key. */ static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, struct extent_buffer *eb, int slot, struct btrfs_key *key) { - int ret = 0; - u32 item_size = btrfs_item_size_nr(eb, slot); + int ret; struct btrfs_dir_item *di; - int name_len; - unsigned long ptr; - unsigned long ptr_end; - struct btrfs_path *fixup_path = NULL; - - ptr = btrfs_item_ptr_offset(eb, slot); - ptr_end = ptr + item_size; - while (ptr < ptr_end) { - di = (struct btrfs_dir_item *)ptr; - name_len = btrfs_dir_name_len(eb, di); - ret = replay_one_name(trans, root, path, eb, di, key); - if (ret < 0) - break; - ptr = (unsigned long)(di + 1); - ptr += name_len; - /* - * If this entry refers to a non-directory (directories can not - * have a link count > 1) and it was added in the transaction - * that was not committed, make sure we fixup the link count of - * the inode it the entry points to. Otherwise something like - * the following would result in a directory pointing to an - * inode with a wrong link that does not account for this dir - * entry: - * - * mkdir testdir - * touch testdir/foo - * touch testdir/bar - * sync - * - * ln testdir/bar testdir/bar_link - * ln testdir/foo testdir/foo_link - * xfs_io -c "fsync" testdir/bar - * - * <power failure> - * - * mount fs, log replay happens - * - * File foo would remain with a link count of 1 when it has two - * entries pointing to it in the directory testdir. This would - * make it impossible to ever delete the parent directory has - * it would result in stale dentries that can never be deleted. - */ - if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) { - struct btrfs_key di_key; + /* We only log dir index keys, which only contain a single dir item. */ + ASSERT(key->type == BTRFS_DIR_INDEX_KEY); - if (!fixup_path) { - fixup_path = btrfs_alloc_path(); - if (!fixup_path) { - ret = -ENOMEM; - break; - } - } + di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item); + ret = replay_one_name(trans, root, path, eb, di, key); + if (ret < 0) + return ret; - btrfs_dir_item_key_to_cpu(eb, di, &di_key); - ret = link_to_fixup_dir(trans, root, fixup_path, - di_key.objectid); - if (ret) - break; - } - ret = 0; + /* + * If this entry refers to a non-directory (directories can not have a + * link count > 1) and it was added in the transaction that was not + * committed, make sure we fixup the link count of the inode the entry + * points to. Otherwise something like the following would result in a + * directory pointing to an inode with a wrong link that does not account + * for this dir entry: + * + * mkdir testdir + * touch testdir/foo + * touch testdir/bar + * sync + * + * ln testdir/bar testdir/bar_link + * ln testdir/foo testdir/foo_link + * xfs_io -c "fsync" testdir/bar + * + * <power failure> + * + * mount fs, log replay happens + * + * File foo would remain with a link count of 1 when it has two entries + * pointing to it in the directory testdir. This would make it impossible + * to ever delete the parent directory has it would result in stale + * dentries that can never be deleted. + */ + if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) { + struct btrfs_path *fixup_path; + struct btrfs_key di_key; + + fixup_path = btrfs_alloc_path(); + if (!fixup_path) + return -ENOMEM; + + btrfs_dir_item_key_to_cpu(eb, di, &di_key); + ret = link_to_fixup_dir(trans, root, fixup_path, di_key.objectid); + btrfs_free_path(fixup_path); } - btrfs_free_path(fixup_path); + return ret; } @@ -2120,7 +2057,7 @@ static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, */ static noinline int find_dir_range(struct btrfs_root *root, struct btrfs_path *path, - u64 dirid, int key_type, + u64 dirid, u64 *start_ret, u64 *end_ret) { struct btrfs_key key; @@ -2133,7 +2070,7 @@ static noinline int find_dir_range(struct btrfs_root *root, return 1; key.objectid = dirid; - key.type = key_type; + key.type = BTRFS_DIR_LOG_INDEX_KEY; key.offset = *start_ret; ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); @@ -2147,7 +2084,7 @@ static noinline int find_dir_range(struct btrfs_root *root, if (ret != 0) btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); - if (key.type != key_type || key.objectid != dirid) { + if (key.type != BTRFS_DIR_LOG_INDEX_KEY || key.objectid != dirid) { ret = 1; goto next; } @@ -2174,7 +2111,7 @@ next: btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); - if (key.type != key_type || key.objectid != dirid) { + if (key.type != BTRFS_DIR_LOG_INDEX_KEY || key.objectid != dirid) { ret = 1; goto out; } @@ -2195,105 +2132,85 @@ out: * to is unlinked */ static noinline int check_item_in_log(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_root *log, struct btrfs_path *path, struct btrfs_path *log_path, struct inode *dir, struct btrfs_key *dir_key) { + struct btrfs_root *root = BTRFS_I(dir)->root; int ret; struct extent_buffer *eb; int slot; - u32 item_size; struct btrfs_dir_item *di; - struct btrfs_dir_item *log_di; int name_len; - unsigned long ptr; - unsigned long ptr_end; char *name; - struct inode *inode; + struct inode *inode = NULL; struct btrfs_key location; -again: + /* + * Currently we only log dir index keys. Even if we replay a log created + * by an older kernel that logged both dir index and dir item keys, all + * we need to do is process the dir index keys, we (and our caller) can + * safely ignore dir item keys (key type BTRFS_DIR_ITEM_KEY). + */ + ASSERT(dir_key->type == BTRFS_DIR_INDEX_KEY); + eb = path->nodes[0]; slot = path->slots[0]; - item_size = btrfs_item_size_nr(eb, slot); - ptr = btrfs_item_ptr_offset(eb, slot); - ptr_end = ptr + item_size; - while (ptr < ptr_end) { - di = (struct btrfs_dir_item *)ptr; - name_len = btrfs_dir_name_len(eb, di); - name = kmalloc(name_len, GFP_NOFS); - if (!name) { - ret = -ENOMEM; - goto out; - } - read_extent_buffer(eb, name, (unsigned long)(di + 1), - name_len); - log_di = NULL; - if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { - log_di = btrfs_lookup_dir_item(trans, log, log_path, - dir_key->objectid, - name, name_len, 0); - } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { - log_di = btrfs_lookup_dir_index_item(trans, log, - log_path, - dir_key->objectid, - dir_key->offset, - name, name_len, 0); - } - if (!log_di || log_di == ERR_PTR(-ENOENT)) { - btrfs_dir_item_key_to_cpu(eb, di, &location); - btrfs_release_path(path); - btrfs_release_path(log_path); - inode = read_one_inode(root, location.objectid); - if (!inode) { - kfree(name); - return -EIO; - } + di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item); + name_len = btrfs_dir_name_len(eb, di); + name = kmalloc(name_len, GFP_NOFS); + if (!name) { + ret = -ENOMEM; + goto out; + } - ret = link_to_fixup_dir(trans, root, - path, location.objectid); - if (ret) { - kfree(name); - iput(inode); - goto out; - } + read_extent_buffer(eb, name, (unsigned long)(di + 1), name_len); - inc_nlink(inode); - ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), - BTRFS_I(inode), name, name_len); - if (!ret) - ret = btrfs_run_delayed_items(trans); - kfree(name); - iput(inode); - if (ret) - goto out; + if (log) { + struct btrfs_dir_item *log_di; - /* there might still be more names under this key - * check and repeat if required - */ - ret = btrfs_search_slot(NULL, root, dir_key, path, - 0, 0); - if (ret == 0) - goto again; + log_di = btrfs_lookup_dir_index_item(trans, log, log_path, + dir_key->objectid, + dir_key->offset, + name, name_len, 0); + if (IS_ERR(log_di)) { + ret = PTR_ERR(log_di); + goto out; + } else if (log_di) { + /* The dentry exists in the log, we have nothing to do. */ ret = 0; goto out; - } else if (IS_ERR(log_di)) { - kfree(name); - return PTR_ERR(log_di); } - btrfs_release_path(log_path); - kfree(name); + } - ptr = (unsigned long)(di + 1); - ptr += name_len; + btrfs_dir_item_key_to_cpu(eb, di, &location); + btrfs_release_path(path); + btrfs_release_path(log_path); + inode = read_one_inode(root, location.objectid); + if (!inode) { + ret = -EIO; + goto out; } - ret = 0; + + ret = link_to_fixup_dir(trans, root, path, location.objectid); + if (ret) + goto out; + + inc_nlink(inode); + ret = unlink_inode_for_log_replay(trans, BTRFS_I(dir), BTRFS_I(inode), + name, name_len); + /* + * Unlike dir item keys, dir index keys can only have one name (entry) in + * them, as there are no key collisions since each key has a unique offset + * (an index number), so we're done. + */ out: btrfs_release_path(path); btrfs_release_path(log_path); + kfree(name); + iput(inode); return ret; } @@ -2336,7 +2253,7 @@ process_leaf: } di = btrfs_item_ptr(path->nodes[0], i, struct btrfs_dir_item); - total_size = btrfs_item_size_nr(path->nodes[0], i); + total_size = btrfs_item_size(path->nodes[0], i); cur = 0; while (cur < total_size) { u16 name_len = btrfs_dir_name_len(path->nodes[0], di); @@ -2413,7 +2330,6 @@ static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, { u64 range_start; u64 range_end; - int key_type = BTRFS_DIR_LOG_ITEM_KEY; int ret = 0; struct btrfs_key dir_key; struct btrfs_key found_key; @@ -2421,7 +2337,7 @@ static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, struct inode *dir; dir_key.objectid = dirid; - dir_key.type = BTRFS_DIR_ITEM_KEY; + dir_key.type = BTRFS_DIR_INDEX_KEY; log_path = btrfs_alloc_path(); if (!log_path) return -ENOMEM; @@ -2435,16 +2351,18 @@ static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, btrfs_free_path(log_path); return 0; } -again: + range_start = 0; range_end = 0; while (1) { if (del_all) range_end = (u64)-1; else { - ret = find_dir_range(log, path, dirid, key_type, + ret = find_dir_range(log, path, dirid, &range_start, &range_end); - if (ret != 0) + if (ret < 0) + goto out; + else if (ret > 0) break; } @@ -2467,13 +2385,15 @@ again: btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); if (found_key.objectid != dirid || - found_key.type != dir_key.type) - goto next_type; + found_key.type != dir_key.type) { + ret = 0; + goto out; + } if (found_key.offset > range_end) break; - ret = check_item_in_log(trans, root, log, path, + ret = check_item_in_log(trans, log, path, log_path, dir, &found_key); if (ret) @@ -2487,15 +2407,7 @@ again: break; range_start = range_end + 1; } - -next_type: ret = 0; - if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { - key_type = BTRFS_DIR_LOG_INDEX_KEY; - dir_key.type = BTRFS_DIR_INDEX_KEY; - btrfs_release_path(path); - goto again; - } out: btrfs_release_path(path); btrfs_free_path(log_path); @@ -2524,7 +2436,7 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, int i; int ret; - ret = btrfs_read_buffer(eb, gen, level, NULL); + ret = btrfs_read_extent_buffer(eb, gen, level, NULL); if (ret) return ret; @@ -2588,6 +2500,7 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, * those prealloc extents just after replaying them. */ if (S_ISREG(mode)) { + struct btrfs_drop_extents_args drop_args = { 0 }; struct inode *inode; u64 from; @@ -2598,12 +2511,18 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, } from = ALIGN(i_size_read(inode), root->fs_info->sectorsize); - ret = btrfs_drop_extents(wc->trans, root, inode, - from, (u64)-1, 1); + drop_args.start = from; + drop_args.end = (u64)-1; + drop_args.drop_cache = true; + ret = btrfs_drop_extents(wc->trans, root, + BTRFS_I(inode), + &drop_args); if (!ret) { + inode_sub_bytes(inode, + drop_args.bytes_found); /* Update the inode's nbytes. */ ret = btrfs_update_inode(wc->trans, - root, inode); + root, BTRFS_I(inode)); } iput(inode); if (ret) @@ -2648,29 +2567,51 @@ static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, eb, i, &key); if (ret) break; - } else if (key.type == BTRFS_DIR_ITEM_KEY) { - ret = replay_one_dir_item(wc->trans, root, path, - eb, i, &key); - if (ret) - break; } + /* + * We don't log BTRFS_DIR_ITEM_KEY keys anymore, only the + * BTRFS_DIR_INDEX_KEY items which we use to derive the + * BTRFS_DIR_ITEM_KEY items. If we are replaying a log from an + * older kernel with such keys, ignore them. + */ } btrfs_free_path(path); return ret; } +/* + * Correctly adjust the reserved bytes occupied by a log tree extent buffer + */ +static void unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start) +{ + struct btrfs_block_group *cache; + + cache = btrfs_lookup_block_group(fs_info, start); + if (!cache) { + btrfs_err(fs_info, "unable to find block group for %llu", start); + return; + } + + spin_lock(&cache->space_info->lock); + spin_lock(&cache->lock); + cache->reserved -= fs_info->nodesize; + cache->space_info->bytes_reserved -= fs_info->nodesize; + spin_unlock(&cache->lock); + spin_unlock(&cache->space_info->lock); + + btrfs_put_block_group(cache); +} + static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int *level, struct walk_control *wc) { struct btrfs_fs_info *fs_info = root->fs_info; - u64 root_owner; u64 bytenr; u64 ptr_gen; struct extent_buffer *next; struct extent_buffer *cur; - struct extent_buffer *parent; u32 blocksize; int ret = 0; @@ -2690,10 +2631,9 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, btrfs_node_key_to_cpu(cur, &first_key, path->slots[*level]); blocksize = fs_info->nodesize; - parent = path->nodes[*level]; - root_owner = btrfs_header_owner(parent); - - next = btrfs_find_create_tree_block(fs_info, bytenr); + next = btrfs_find_create_tree_block(fs_info, bytenr, + btrfs_header_owner(cur), + *level - 1); if (IS_ERR(next)) return PTR_ERR(next); @@ -2707,7 +2647,7 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, path->slots[*level]++; if (wc->free) { - ret = btrfs_read_buffer(next, ptr_gen, + ret = btrfs_read_extent_buffer(next, ptr_gen, *level - 1, &first_key); if (ret) { free_extent_buffer(next); @@ -2716,28 +2656,27 @@ static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, if (trans) { btrfs_tree_lock(next); - btrfs_set_lock_blocking_write(next); btrfs_clean_tree_block(next); btrfs_wait_tree_block_writeback(next); btrfs_tree_unlock(next); + ret = btrfs_pin_reserved_extent(trans, + bytenr, blocksize); + if (ret) { + free_extent_buffer(next); + return ret; + } + btrfs_redirty_list_add( + trans->transaction, next); } else { if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags)) clear_extent_buffer_dirty(next); - } - - WARN_ON(root_owner != - BTRFS_TREE_LOG_OBJECTID); - ret = btrfs_pin_reserved_extent(fs_info, - bytenr, blocksize); - if (ret) { - free_extent_buffer(next); - return ret; + unaccount_log_buffer(fs_info, bytenr); } } free_extent_buffer(next); continue; } - ret = btrfs_read_buffer(next, ptr_gen, *level - 1, &first_key); + ret = btrfs_read_extent_buffer(next, ptr_gen, *level - 1, &first_key); if (ret) { free_extent_buffer(next); return ret; @@ -2762,7 +2701,6 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, struct walk_control *wc) { struct btrfs_fs_info *fs_info = root->fs_info; - u64 root_owner; int i; int slot; int ret; @@ -2775,13 +2713,6 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, WARN_ON(*level == 0); return 0; } else { - struct extent_buffer *parent; - if (path->nodes[*level] == root->node) - parent = path->nodes[*level]; - else - parent = path->nodes[*level + 1]; - - root_owner = btrfs_header_owner(parent); ret = wc->process_func(root, path->nodes[*level], wc, btrfs_header_generation(path->nodes[*level]), *level); @@ -2795,21 +2726,23 @@ static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, if (trans) { btrfs_tree_lock(next); - btrfs_set_lock_blocking_write(next); btrfs_clean_tree_block(next); btrfs_wait_tree_block_writeback(next); btrfs_tree_unlock(next); + ret = btrfs_pin_reserved_extent(trans, + path->nodes[*level]->start, + path->nodes[*level]->len); + if (ret) + return ret; + btrfs_redirty_list_add(trans->transaction, + next); } else { if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags)) clear_extent_buffer_dirty(next); - } - WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); - ret = btrfs_pin_reserved_extent(fs_info, - path->nodes[*level]->start, - path->nodes[*level]->len); - if (ret) - return ret; + unaccount_log_buffer(fs_info, + path->nodes[*level]->start); + } } free_extent_buffer(path->nodes[*level]); path->nodes[*level] = NULL; @@ -2876,19 +2809,19 @@ static int walk_log_tree(struct btrfs_trans_handle *trans, if (trans) { btrfs_tree_lock(next); - btrfs_set_lock_blocking_write(next); btrfs_clean_tree_block(next); btrfs_wait_tree_block_writeback(next); btrfs_tree_unlock(next); + ret = btrfs_pin_reserved_extent(trans, + next->start, next->len); + if (ret) + goto out; + btrfs_redirty_list_add(trans->transaction, next); } else { if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags)) clear_extent_buffer_dirty(next); + unaccount_log_buffer(fs_info, next->start); } - - ret = btrfs_pin_reserved_extent(fs_info, next->start, - next->len); - if (ret) - goto out; } } @@ -2964,9 +2897,6 @@ static void wait_for_writer(struct btrfs_root *root) static inline void btrfs_remove_log_ctx(struct btrfs_root *root, struct btrfs_log_ctx *ctx) { - if (!ctx) - return; - mutex_lock(&root->log_mutex); list_del_init(&ctx->list); mutex_unlock(&root->log_mutex); @@ -2986,8 +2916,6 @@ static inline void btrfs_remove_all_log_ctxs(struct btrfs_root *root, list_del_init(&ctx->list); ctx->log_ret = error; } - - INIT_LIST_HEAD(&root->log_ctxs[index]); } /* @@ -3016,6 +2944,8 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, int log_transid = 0; struct btrfs_log_ctx root_log_ctx; struct blk_plug plug; + u64 log_root_start; + u64 log_root_level; mutex_lock(&root->log_mutex); log_transid = ctx->log_transid; @@ -3053,7 +2983,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, /* bail out if we need to do a full commit */ if (btrfs_need_log_full_commit(trans)) { - ret = -EAGAIN; + ret = BTRFS_LOG_FORCE_COMMIT; mutex_unlock(&root->log_mutex); goto out; } @@ -3068,6 +2998,17 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, */ blk_start_plug(&plug); ret = btrfs_write_marked_extents(fs_info, &log->dirty_log_pages, mark); + /* + * -EAGAIN happens when someone, e.g., a concurrent transaction + * commit, writes a dirty extent in this tree-log commit. This + * concurrent write will create a hole writing out the extents, + * and we cannot proceed on a zoned filesystem, requiring + * sequential writing. While we can bail out to a full commit + * here, but we can continue hoping the concurrent writing fills + * the hole. + */ + if (ret == -EAGAIN && btrfs_is_zoned(fs_info)) + ret = 0; if (ret) { blk_finish_plug(&plug); btrfs_abort_transaction(trans, ret); @@ -3102,32 +3043,33 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, */ mutex_unlock(&root->log_mutex); + if (btrfs_is_zoned(fs_info)) { + mutex_lock(&fs_info->tree_root->log_mutex); + if (!log_root_tree->node) { + ret = btrfs_alloc_log_tree_node(trans, log_root_tree); + if (ret) { + mutex_unlock(&fs_info->tree_root->log_mutex); + blk_finish_plug(&plug); + goto out; + } + } + mutex_unlock(&fs_info->tree_root->log_mutex); + } + btrfs_init_log_ctx(&root_log_ctx, NULL); mutex_lock(&log_root_tree->log_mutex); - atomic_inc(&log_root_tree->log_batch); - atomic_inc(&log_root_tree->log_writers); index2 = log_root_tree->log_transid % 2; list_add_tail(&root_log_ctx.list, &log_root_tree->log_ctxs[index2]); root_log_ctx.log_transid = log_root_tree->log_transid; - mutex_unlock(&log_root_tree->log_mutex); - - mutex_lock(&log_root_tree->log_mutex); - /* * Now we are safe to update the log_root_tree because we're under the * log_mutex, and we're a current writer so we're holding the commit * open until we drop the log_mutex. */ ret = update_log_root(trans, log, &new_root_item); - - if (atomic_dec_and_test(&log_root_tree->log_writers)) { - /* atomic_dec_and_test implies a barrier */ - cond_wake_up_nomb(&log_root_tree->log_writer_wait); - } - if (ret) { if (!list_empty(&root_log_ctx.list)) list_del_init(&root_log_ctx.list); @@ -3142,7 +3084,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, } btrfs_wait_tree_log_extents(log, mark); mutex_unlock(&log_root_tree->log_mutex); - ret = -EAGAIN; + ret = BTRFS_LOG_FORCE_COMMIT; goto out; } @@ -3173,8 +3115,6 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, root_log_ctx.log_transid - 1); } - wait_for_writer(log_root_tree); - /* * now that we've moved on to the tree of log tree roots, * check the full commit flag again @@ -3183,7 +3123,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, blk_finish_plug(&plug); btrfs_wait_tree_log_extents(log, mark); mutex_unlock(&log_root_tree->log_mutex); - ret = -EAGAIN; + ret = BTRFS_LOG_FORCE_COMMIT; goto out_wake_log_root; } @@ -3191,7 +3131,17 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, &log_root_tree->dirty_log_pages, EXTENT_DIRTY | EXTENT_NEW); blk_finish_plug(&plug); - if (ret) { + /* + * As described above, -EAGAIN indicates a hole in the extents. We + * cannot wait for these write outs since the waiting cause a + * deadlock. Bail out to the full commit instead. + */ + if (ret == -EAGAIN && btrfs_is_zoned(fs_info)) { + btrfs_set_log_full_commit(trans); + btrfs_wait_tree_log_extents(log, mark); + mutex_unlock(&log_root_tree->log_mutex); + goto out_wake_log_root; + } else if (ret) { btrfs_set_log_full_commit(trans); btrfs_abort_transaction(trans, ret); mutex_unlock(&log_root_tree->log_mutex); @@ -3207,32 +3157,63 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, goto out_wake_log_root; } - btrfs_set_super_log_root(fs_info->super_for_commit, - log_root_tree->node->start); - btrfs_set_super_log_root_level(fs_info->super_for_commit, - btrfs_header_level(log_root_tree->node)); - + log_root_start = log_root_tree->node->start; + log_root_level = btrfs_header_level(log_root_tree->node); log_root_tree->log_transid++; mutex_unlock(&log_root_tree->log_mutex); /* - * Nobody else is going to jump in and write the ctree - * super here because the log_commit atomic below is protecting - * us. We must be called with a transaction handle pinning - * the running transaction open, so a full commit can't hop - * in and cause problems either. + * Here we are guaranteed that nobody is going to write the superblock + * for the current transaction before us and that neither we do write + * our superblock before the previous transaction finishes its commit + * and writes its superblock, because: + * + * 1) We are holding a handle on the current transaction, so no body + * can commit it until we release the handle; + * + * 2) Before writing our superblock we acquire the tree_log_mutex, so + * if the previous transaction is still committing, and hasn't yet + * written its superblock, we wait for it to do it, because a + * transaction commit acquires the tree_log_mutex when the commit + * begins and releases it only after writing its superblock. + */ + mutex_lock(&fs_info->tree_log_mutex); + + /* + * The previous transaction writeout phase could have failed, and thus + * marked the fs in an error state. We must not commit here, as we + * could have updated our generation in the super_for_commit and + * writing the super here would result in transid mismatches. If there + * is an error here just bail. */ + if (BTRFS_FS_ERROR(fs_info)) { + ret = -EIO; + btrfs_set_log_full_commit(trans); + btrfs_abort_transaction(trans, ret); + mutex_unlock(&fs_info->tree_log_mutex); + goto out_wake_log_root; + } + + btrfs_set_super_log_root(fs_info->super_for_commit, log_root_start); + btrfs_set_super_log_root_level(fs_info->super_for_commit, log_root_level); ret = write_all_supers(fs_info, 1); + mutex_unlock(&fs_info->tree_log_mutex); if (ret) { btrfs_set_log_full_commit(trans); btrfs_abort_transaction(trans, ret); goto out_wake_log_root; } - mutex_lock(&root->log_mutex); - if (root->last_log_commit < log_transid) - root->last_log_commit = log_transid; - mutex_unlock(&root->log_mutex); + /* + * We know there can only be one task here, since we have not yet set + * root->log_commit[index1] to 0 and any task attempting to sync the + * log must wait for the previous log transaction to commit if it's + * still in progress or wait for the current log transaction commit if + * someone else already started it. We use <= and not < because the + * first log transaction has an ID of 0. + */ + ASSERT(root->last_log_commit <= log_transid); + root->last_log_commit = log_transid; out_wake_log_root: mutex_lock(&log_root_tree->log_mutex); @@ -3273,18 +3254,44 @@ static void free_log_tree(struct btrfs_trans_handle *trans, .process_func = process_one_buffer }; - ret = walk_log_tree(trans, log, &wc); - if (ret) { - if (trans) - btrfs_abort_transaction(trans, ret); - else - btrfs_handle_fs_error(log->fs_info, ret, NULL); + if (log->node) { + ret = walk_log_tree(trans, log, &wc); + if (ret) { + /* + * We weren't able to traverse the entire log tree, the + * typical scenario is getting an -EIO when reading an + * extent buffer of the tree, due to a previous writeback + * failure of it. + */ + set_bit(BTRFS_FS_STATE_LOG_CLEANUP_ERROR, + &log->fs_info->fs_state); + + /* + * Some extent buffers of the log tree may still be dirty + * and not yet written back to storage, because we may + * have updates to a log tree without syncing a log tree, + * such as during rename and link operations. So flush + * them out and wait for their writeback to complete, so + * that we properly cleanup their state and pages. + */ + btrfs_write_marked_extents(log->fs_info, + &log->dirty_log_pages, + EXTENT_DIRTY | EXTENT_NEW); + btrfs_wait_tree_log_extents(log, + EXTENT_DIRTY | EXTENT_NEW); + + if (trans) + btrfs_abort_transaction(trans, ret); + else + btrfs_handle_fs_error(log->fs_info, ret, NULL); + } } clear_extent_bits(&log->dirty_log_pages, 0, (u64)-1, EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT); - free_extent_buffer(log->node); - kfree(log); + extent_io_tree_release(&log->log_csum_range); + + btrfs_put_root(log); } /* @@ -3296,6 +3303,7 @@ int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) if (root->log_root) { free_log_tree(trans, root->log_root); root->log_root = NULL; + clear_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state); } return 0; } @@ -3306,32 +3314,162 @@ int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, if (fs_info->log_root_tree) { free_log_tree(trans, fs_info->log_root_tree); fs_info->log_root_tree = NULL; + clear_bit(BTRFS_ROOT_HAS_LOG_TREE, &fs_info->tree_root->state); } return 0; } /* - * Check if an inode was logged in the current transaction. We can't always rely - * on an inode's logged_trans value, because it's an in-memory only field and - * therefore not persisted. This means that its value is lost if the inode gets - * evicted and loaded again from disk (in which case it has a value of 0, and - * certainly it is smaller then any possible transaction ID), when that happens - * the full_sync flag is set in the inode's runtime flags, so on that case we - * assume eviction happened and ignore the logged_trans value, assuming the - * worst case, that the inode was logged before in the current transaction. + * Check if an inode was logged in the current transaction. This correctly deals + * with the case where the inode was logged but has a logged_trans of 0, which + * happens if the inode is evicted and loaded again, as logged_trans is an in + * memory only field (not persisted). + * + * Returns 1 if the inode was logged before in the transaction, 0 if it was not, + * and < 0 on error. */ -static bool inode_logged(struct btrfs_trans_handle *trans, - struct btrfs_inode *inode) +static int inode_logged(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path_in) { + struct btrfs_path *path = path_in; + struct btrfs_key key; + int ret; + if (inode->logged_trans == trans->transid) - return true; + return 1; + + /* + * If logged_trans is not 0, then we know the inode logged was not logged + * in this transaction, so we can return false right away. + */ + if (inode->logged_trans > 0) + return 0; + + /* + * If no log tree was created for this root in this transaction, then + * the inode can not have been logged in this transaction. In that case + * set logged_trans to anything greater than 0 and less than the current + * transaction's ID, to avoid the search below in a future call in case + * a log tree gets created after this. + */ + if (!test_bit(BTRFS_ROOT_HAS_LOG_TREE, &inode->root->state)) { + inode->logged_trans = trans->transid - 1; + return 0; + } + + /* + * We have a log tree and the inode's logged_trans is 0. We can't tell + * for sure if the inode was logged before in this transaction by looking + * only at logged_trans. We could be pessimistic and assume it was, but + * that can lead to unnecessarily logging an inode during rename and link + * operations, and then further updating the log in followup rename and + * link operations, specially if it's a directory, which adds latency + * visible to applications doing a series of rename or link operations. + * + * A logged_trans of 0 here can mean several things: + * + * 1) The inode was never logged since the filesystem was mounted, and may + * or may have not been evicted and loaded again; + * + * 2) The inode was logged in a previous transaction, then evicted and + * then loaded again; + * + * 3) The inode was logged in the current transaction, then evicted and + * then loaded again. + * + * For cases 1) and 2) we don't want to return true, but we need to detect + * case 3) and return true. So we do a search in the log root for the inode + * item. + */ + key.objectid = btrfs_ino(inode); + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + + if (!path) { + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + } + + ret = btrfs_search_slot(NULL, inode->root->log_root, &key, path, 0, 0); + + if (path_in) + btrfs_release_path(path); + else + btrfs_free_path(path); + + /* + * Logging an inode always results in logging its inode item. So if we + * did not find the item we know the inode was not logged for sure. + */ + if (ret < 0) { + return ret; + } else if (ret > 0) { + /* + * Set logged_trans to a value greater than 0 and less then the + * current transaction to avoid doing the search in future calls. + */ + inode->logged_trans = trans->transid - 1; + return 0; + } + + /* + * The inode was previously logged and then evicted, set logged_trans to + * the current transacion's ID, to avoid future tree searches as long as + * the inode is not evicted again. + */ + inode->logged_trans = trans->transid; - if (inode->last_trans == trans->transid && - test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags) && - !test_bit(BTRFS_FS_LOG_RECOVERING, &trans->fs_info->flags)) - return true; + /* + * If it's a directory, then we must set last_dir_index_offset to the + * maximum possible value, so that the next attempt to log the inode does + * not skip checking if dir index keys found in modified subvolume tree + * leaves have been logged before, otherwise it would result in attempts + * to insert duplicate dir index keys in the log tree. This must be done + * because last_dir_index_offset is an in-memory only field, not persisted + * in the inode item or any other on-disk structure, so its value is lost + * once the inode is evicted. + */ + if (S_ISDIR(inode->vfs_inode.i_mode)) + inode->last_dir_index_offset = (u64)-1; + + return 1; +} + +/* + * Delete a directory entry from the log if it exists. + * + * Returns < 0 on error + * 1 if the entry does not exists + * 0 if the entry existed and was successfully deleted + */ +static int del_logged_dentry(struct btrfs_trans_handle *trans, + struct btrfs_root *log, + struct btrfs_path *path, + u64 dir_ino, + const char *name, int name_len, + u64 index) +{ + struct btrfs_dir_item *di; + + /* + * We only log dir index items of a directory, so we don't need to look + * for dir item keys. + */ + di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, + index, name, name_len, -1); + if (IS_ERR(di)) + return PTR_ERR(di); + else if (!di) + return 1; - return false; + /* + * We do not need to update the size field of the directory's + * inode item because on log replay we update the field to reflect + * all existing entries in the directory (see overwrite_item()). + */ + return btrfs_delete_one_dir_name(trans, log, path, di); } /* @@ -3355,143 +3493,74 @@ static bool inode_logged(struct btrfs_trans_handle *trans, * This optimizations allows us to avoid relogging the entire inode * or the entire directory. */ -int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - const char *name, int name_len, - struct btrfs_inode *dir, u64 index) +void btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + const char *name, int name_len, + struct btrfs_inode *dir, u64 index) { - struct btrfs_root *log; - struct btrfs_dir_item *di; struct btrfs_path *path; int ret; - int err = 0; - int bytes_del = 0; - u64 dir_ino = btrfs_ino(dir); - if (!inode_logged(trans, dir)) - return 0; + ret = inode_logged(trans, dir, NULL); + if (ret == 0) + return; + else if (ret < 0) { + btrfs_set_log_full_commit(trans); + return; + } ret = join_running_log_trans(root); if (ret) - return 0; + return; mutex_lock(&dir->log_mutex); - log = root->log_root; path = btrfs_alloc_path(); if (!path) { - err = -ENOMEM; + ret = -ENOMEM; goto out_unlock; } - di = btrfs_lookup_dir_item(trans, log, path, dir_ino, - name, name_len, -1); - if (IS_ERR(di)) { - err = PTR_ERR(di); - goto fail; - } - if (di) { - ret = btrfs_delete_one_dir_name(trans, log, path, di); - bytes_del += name_len; - if (ret) { - err = ret; - goto fail; - } - } - btrfs_release_path(path); - di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, - index, name, name_len, -1); - if (IS_ERR(di)) { - err = PTR_ERR(di); - goto fail; - } - if (di) { - ret = btrfs_delete_one_dir_name(trans, log, path, di); - bytes_del += name_len; - if (ret) { - err = ret; - goto fail; - } - } - - /* update the directory size in the log to reflect the names - * we have removed - */ - if (bytes_del) { - struct btrfs_key key; - - key.objectid = dir_ino; - key.offset = 0; - key.type = BTRFS_INODE_ITEM_KEY; - btrfs_release_path(path); - - ret = btrfs_search_slot(trans, log, &key, path, 0, 1); - if (ret < 0) { - err = ret; - goto fail; - } - if (ret == 0) { - struct btrfs_inode_item *item; - u64 i_size; - - item = btrfs_item_ptr(path->nodes[0], path->slots[0], - struct btrfs_inode_item); - i_size = btrfs_inode_size(path->nodes[0], item); - if (i_size > bytes_del) - i_size -= bytes_del; - else - i_size = 0; - btrfs_set_inode_size(path->nodes[0], item, i_size); - btrfs_mark_buffer_dirty(path->nodes[0]); - } else - ret = 0; - btrfs_release_path(path); - } -fail: + ret = del_logged_dentry(trans, root->log_root, path, btrfs_ino(dir), + name, name_len, index); btrfs_free_path(path); out_unlock: mutex_unlock(&dir->log_mutex); - if (ret == -ENOSPC) { + if (ret < 0) btrfs_set_log_full_commit(trans); - ret = 0; - } else if (ret < 0) - btrfs_abort_transaction(trans, ret); - btrfs_end_log_trans(root); - - return err; } /* see comments for btrfs_del_dir_entries_in_log */ -int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - const char *name, int name_len, - struct btrfs_inode *inode, u64 dirid) +void btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + const char *name, int name_len, + struct btrfs_inode *inode, u64 dirid) { struct btrfs_root *log; u64 index; int ret; - if (!inode_logged(trans, inode)) - return 0; + ret = inode_logged(trans, inode, NULL); + if (ret == 0) + return; + else if (ret < 0) { + btrfs_set_log_full_commit(trans); + return; + } ret = join_running_log_trans(root); if (ret) - return 0; + return; log = root->log_root; mutex_lock(&inode->log_mutex); ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode), dirid, &index); mutex_unlock(&inode->log_mutex); - if (ret == -ENOSPC) { + if (ret < 0 && ret != -ENOENT) btrfs_set_log_full_commit(trans); - ret = 0; - } else if (ret < 0 && ret != -ENOENT) - btrfs_abort_transaction(trans, ret); btrfs_end_log_trans(root); - - return ret; } /* @@ -3502,7 +3571,7 @@ int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, struct btrfs_root *log, struct btrfs_path *path, - int key_type, u64 dirid, + u64 dirid, u64 first_offset, u64 last_offset) { int ret; @@ -3511,49 +3580,236 @@ static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, key.objectid = dirid; key.offset = first_offset; - if (key_type == BTRFS_DIR_ITEM_KEY) - key.type = BTRFS_DIR_LOG_ITEM_KEY; - else - key.type = BTRFS_DIR_LOG_INDEX_KEY; + key.type = BTRFS_DIR_LOG_INDEX_KEY; ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); - if (ret) + /* + * -EEXIST is fine and can happen sporadically when we are logging a + * directory and have concurrent insertions in the subvolume's tree for + * items from other inodes and that result in pushing off some dir items + * from one leaf to another in order to accommodate for the new items. + * This results in logging the same dir index range key. + */ + if (ret && ret != -EEXIST) return ret; item = btrfs_item_ptr(path->nodes[0], path->slots[0], struct btrfs_dir_log_item); + if (ret == -EEXIST) { + const u64 curr_end = btrfs_dir_log_end(path->nodes[0], item); + + /* + * btrfs_del_dir_entries_in_log() might have been called during + * an unlink between the initial insertion of this key and the + * current update, or we might be logging a single entry deletion + * during a rename, so set the new last_offset to the max value. + */ + last_offset = max(last_offset, curr_end); + } btrfs_set_dir_log_end(path->nodes[0], item, last_offset); btrfs_mark_buffer_dirty(path->nodes[0]); btrfs_release_path(path); return 0; } +static int flush_dir_items_batch(struct btrfs_trans_handle *trans, + struct btrfs_root *log, + struct extent_buffer *src, + struct btrfs_path *dst_path, + int start_slot, + int count) +{ + char *ins_data = NULL; + struct btrfs_item_batch batch; + struct extent_buffer *dst; + unsigned long src_offset; + unsigned long dst_offset; + struct btrfs_key key; + u32 item_size; + int ret; + int i; + + ASSERT(count > 0); + batch.nr = count; + + if (count == 1) { + btrfs_item_key_to_cpu(src, &key, start_slot); + item_size = btrfs_item_size(src, start_slot); + batch.keys = &key; + batch.data_sizes = &item_size; + batch.total_data_size = item_size; + } else { + struct btrfs_key *ins_keys; + u32 *ins_sizes; + + ins_data = kmalloc(count * sizeof(u32) + + count * sizeof(struct btrfs_key), GFP_NOFS); + if (!ins_data) + return -ENOMEM; + + ins_sizes = (u32 *)ins_data; + ins_keys = (struct btrfs_key *)(ins_data + count * sizeof(u32)); + batch.keys = ins_keys; + batch.data_sizes = ins_sizes; + batch.total_data_size = 0; + + for (i = 0; i < count; i++) { + const int slot = start_slot + i; + + btrfs_item_key_to_cpu(src, &ins_keys[i], slot); + ins_sizes[i] = btrfs_item_size(src, slot); + batch.total_data_size += ins_sizes[i]; + } + } + + ret = btrfs_insert_empty_items(trans, log, dst_path, &batch); + if (ret) + goto out; + + dst = dst_path->nodes[0]; + /* + * Copy all the items in bulk, in a single copy operation. Item data is + * organized such that it's placed at the end of a leaf and from right + * to left. For example, the data for the second item ends at an offset + * that matches the offset where the data for the first item starts, the + * data for the third item ends at an offset that matches the offset + * where the data of the second items starts, and so on. + * Therefore our source and destination start offsets for copy match the + * offsets of the last items (highest slots). + */ + dst_offset = btrfs_item_ptr_offset(dst, dst_path->slots[0] + count - 1); + src_offset = btrfs_item_ptr_offset(src, start_slot + count - 1); + copy_extent_buffer(dst, src, dst_offset, src_offset, batch.total_data_size); + btrfs_release_path(dst_path); +out: + kfree(ins_data); + + return ret; +} + +static int process_dir_items_leaf(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path, + struct btrfs_path *dst_path, + struct btrfs_log_ctx *ctx, + u64 *last_old_dentry_offset) +{ + struct btrfs_root *log = inode->root->log_root; + struct extent_buffer *src = path->nodes[0]; + const int nritems = btrfs_header_nritems(src); + const u64 ino = btrfs_ino(inode); + bool last_found = false; + int batch_start = 0; + int batch_size = 0; + int i; + + for (i = path->slots[0]; i < nritems; i++) { + struct btrfs_dir_item *di; + struct btrfs_key key; + int ret; + + btrfs_item_key_to_cpu(src, &key, i); + + if (key.objectid != ino || key.type != BTRFS_DIR_INDEX_KEY) { + last_found = true; + break; + } + + di = btrfs_item_ptr(src, i, struct btrfs_dir_item); + ctx->last_dir_item_offset = key.offset; + + /* + * Skip ranges of items that consist only of dir item keys created + * in past transactions. However if we find a gap, we must log a + * dir index range item for that gap, so that index keys in that + * gap are deleted during log replay. + */ + if (btrfs_dir_transid(src, di) < trans->transid) { + if (key.offset > *last_old_dentry_offset + 1) { + ret = insert_dir_log_key(trans, log, dst_path, + ino, *last_old_dentry_offset + 1, + key.offset - 1); + if (ret < 0) + return ret; + } + + *last_old_dentry_offset = key.offset; + continue; + } + + /* If we logged this dir index item before, we can skip it. */ + if (key.offset <= inode->last_dir_index_offset) + continue; + + /* + * We must make sure that when we log a directory entry, the + * corresponding inode, after log replay, has a matching link + * count. For example: + * + * touch foo + * mkdir mydir + * sync + * ln foo mydir/bar + * xfs_io -c "fsync" mydir + * <crash> + * <mount fs and log replay> + * + * Would result in a fsync log that when replayed, our file inode + * would have a link count of 1, but we get two directory entries + * pointing to the same inode. After removing one of the names, + * it would not be possible to remove the other name, which + * resulted always in stale file handle errors, and would not be + * possible to rmdir the parent directory, since its i_size could + * never be decremented to the value BTRFS_EMPTY_DIR_SIZE, + * resulting in -ENOTEMPTY errors. + */ + if (!ctx->log_new_dentries) { + struct btrfs_key di_key; + + btrfs_dir_item_key_to_cpu(src, di, &di_key); + if (di_key.type != BTRFS_ROOT_ITEM_KEY) + ctx->log_new_dentries = true; + } + + if (batch_size == 0) + batch_start = i; + batch_size++; + } + + if (batch_size > 0) { + int ret; + + ret = flush_dir_items_batch(trans, log, src, dst_path, + batch_start, batch_size); + if (ret < 0) + return ret; + } + + return last_found ? 1 : 0; +} + /* * log all the items included in the current transaction for a given * directory. This also creates the range items in the log tree required * to replay anything deleted before the fsync */ static noinline int log_dir_items(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, + struct btrfs_inode *inode, struct btrfs_path *path, - struct btrfs_path *dst_path, int key_type, + struct btrfs_path *dst_path, struct btrfs_log_ctx *ctx, u64 min_offset, u64 *last_offset_ret) { struct btrfs_key min_key; + struct btrfs_root *root = inode->root; struct btrfs_root *log = root->log_root; - struct extent_buffer *src; int err = 0; int ret; - int i; - int nritems; - u64 first_offset = min_offset; + u64 last_old_dentry_offset = min_offset - 1; u64 last_offset = (u64)-1; u64 ino = btrfs_ino(inode); - log = root->log_root; - min_key.objectid = ino; - min_key.type = key_type; + min_key.type = BTRFS_DIR_INDEX_KEY; min_key.offset = min_offset; ret = btrfs_search_forward(root, &min_key, path, trans->transid); @@ -3562,9 +3818,10 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, * we didn't find anything from this transaction, see if there * is anything at all */ - if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) { + if (ret != 0 || min_key.objectid != ino || + min_key.type != BTRFS_DIR_INDEX_KEY) { min_key.objectid = ino; - min_key.type = key_type; + min_key.type = BTRFS_DIR_INDEX_KEY; min_key.offset = (u64)-1; btrfs_release_path(path); ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); @@ -3572,7 +3829,7 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, btrfs_release_path(path); return ret; } - ret = btrfs_previous_item(root, path, ino, key_type); + ret = btrfs_previous_item(root, path, ino, BTRFS_DIR_INDEX_KEY); /* if ret == 0 there are items for this type, * create a range to tell us the last key of this type. @@ -3581,29 +3838,31 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, */ if (ret == 0) { struct btrfs_key tmp; + btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); - if (key_type == tmp.type) - first_offset = max(min_offset, tmp.offset) + 1; + if (tmp.type == BTRFS_DIR_INDEX_KEY) + last_old_dentry_offset = tmp.offset; } goto done; } /* go backward to find any previous key */ - ret = btrfs_previous_item(root, path, ino, key_type); + ret = btrfs_previous_item(root, path, ino, BTRFS_DIR_INDEX_KEY); if (ret == 0) { struct btrfs_key tmp; + btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); - if (key_type == tmp.type) { - first_offset = tmp.offset; - ret = overwrite_item(trans, log, dst_path, - path->nodes[0], path->slots[0], - &tmp); - if (ret) { - err = ret; - goto done; - } - } + /* + * The dir index key before the first one we found that needs to + * be logged might be in a previous leaf, and there might be a + * gap between these keys, meaning that we had deletions that + * happened. So the key range item we log (key type + * BTRFS_DIR_LOG_INDEX_KEY) must cover a range that starts at the + * previous key's offset plus 1, so that those deletes are replayed. + */ + if (tmp.type == BTRFS_DIR_INDEX_KEY) + last_old_dentry_offset = tmp.offset; } btrfs_release_path(path); @@ -3615,6 +3874,7 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, * search and this search we'll not find the key again and can just * bail. */ +search: ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); if (ret != 0) goto done; @@ -3624,55 +3884,14 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, * from our directory */ while (1) { - struct btrfs_key tmp; - src = path->nodes[0]; - nritems = btrfs_header_nritems(src); - for (i = path->slots[0]; i < nritems; i++) { - struct btrfs_dir_item *di; - - btrfs_item_key_to_cpu(src, &min_key, i); - - if (min_key.objectid != ino || min_key.type != key_type) - goto done; - ret = overwrite_item(trans, log, dst_path, src, i, - &min_key); - if (ret) { + ret = process_dir_items_leaf(trans, inode, path, dst_path, ctx, + &last_old_dentry_offset); + if (ret != 0) { + if (ret < 0) err = ret; - goto done; - } - - /* - * We must make sure that when we log a directory entry, - * the corresponding inode, after log replay, has a - * matching link count. For example: - * - * touch foo - * mkdir mydir - * sync - * ln foo mydir/bar - * xfs_io -c "fsync" mydir - * <crash> - * <mount fs and log replay> - * - * Would result in a fsync log that when replayed, our - * file inode would have a link count of 1, but we get - * two directory entries pointing to the same inode. - * After removing one of the names, it would not be - * possible to remove the other name, which resulted - * always in stale file handle errors, and would not - * be possible to rmdir the parent directory, since - * its i_size could never decrement to the value - * BTRFS_EMPTY_DIR_SIZE, resulting in -ENOTEMPTY errors. - */ - di = btrfs_item_ptr(src, i, struct btrfs_dir_item); - btrfs_dir_item_key_to_cpu(src, di, &tmp); - if (ctx && - (btrfs_dir_transid(src, di) == trans->transid || - btrfs_dir_type(src, di) == BTRFS_FT_DIR) && - tmp.type != BTRFS_ROOT_ITEM_KEY) - ctx->log_new_dentries = true; + goto done; } - path->slots[0] = nritems; + path->slots[0] = btrfs_header_nritems(path->nodes[0]); /* * look ahead to the next item and see if it is also @@ -3686,21 +3905,29 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans, err = ret; goto done; } - btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); - if (tmp.objectid != ino || tmp.type != key_type) { + btrfs_item_key_to_cpu(path->nodes[0], &min_key, path->slots[0]); + if (min_key.objectid != ino || min_key.type != BTRFS_DIR_INDEX_KEY) { last_offset = (u64)-1; goto done; } if (btrfs_header_generation(path->nodes[0]) != trans->transid) { - ret = overwrite_item(trans, log, dst_path, - path->nodes[0], path->slots[0], - &tmp); - if (ret) - err = ret; - else - last_offset = tmp.offset; + /* + * The next leaf was not changed in the current transaction + * and has at least one dir index key. + * We check for the next key because there might have been + * one or more deletions between the last key we logged and + * that next key. So the key range item we log (key type + * BTRFS_DIR_LOG_INDEX_KEY) must end at the next key's + * offset minus 1, so that those deletes are replayed. + */ + last_offset = min_key.offset - 1; goto done; } + if (need_resched()) { + btrfs_release_path(path); + cond_resched(); + goto search; + } } done: btrfs_release_path(path); @@ -3709,18 +3936,91 @@ done: if (err == 0) { *last_offset_ret = last_offset; /* - * insert the log range keys to indicate where the log - * is valid + * In case the leaf was changed in the current transaction but + * all its dir items are from a past transaction, the last item + * in the leaf is a dir item and there's no gap between that last + * dir item and the first one on the next leaf (which did not + * change in the current transaction), then we don't need to log + * a range, last_old_dentry_offset is == to last_offset. */ - ret = insert_dir_log_key(trans, log, path, key_type, - ino, first_offset, last_offset); - if (ret) - err = ret; + ASSERT(last_old_dentry_offset <= last_offset); + if (last_old_dentry_offset < last_offset) { + ret = insert_dir_log_key(trans, log, path, ino, + last_old_dentry_offset + 1, + last_offset); + if (ret) + err = ret; + } } return err; } /* + * If the inode was logged before and it was evicted, then its + * last_dir_index_offset is (u64)-1, so we don't the value of the last index + * key offset. If that's the case, search for it and update the inode. This + * is to avoid lookups in the log tree every time we try to insert a dir index + * key from a leaf changed in the current transaction, and to allow us to always + * do batch insertions of dir index keys. + */ +static int update_last_dir_index_offset(struct btrfs_inode *inode, + struct btrfs_path *path, + const struct btrfs_log_ctx *ctx) +{ + const u64 ino = btrfs_ino(inode); + struct btrfs_key key; + int ret; + + lockdep_assert_held(&inode->log_mutex); + + if (inode->last_dir_index_offset != (u64)-1) + return 0; + + if (!ctx->logged_before) { + inode->last_dir_index_offset = BTRFS_DIR_START_INDEX - 1; + return 0; + } + + key.objectid = ino; + key.type = BTRFS_DIR_INDEX_KEY; + key.offset = (u64)-1; + + ret = btrfs_search_slot(NULL, inode->root->log_root, &key, path, 0, 0); + /* + * An error happened or we actually have an index key with an offset + * value of (u64)-1. Bail out, we're done. + */ + if (ret <= 0) + goto out; + + ret = 0; + inode->last_dir_index_offset = BTRFS_DIR_START_INDEX - 1; + + /* + * No dir index items, bail out and leave last_dir_index_offset with + * the value right before the first valid index value. + */ + if (path->slots[0] == 0) + goto out; + + /* + * btrfs_search_slot() left us at one slot beyond the slot with the last + * index key, or beyond the last key of the directory that is not an + * index key. If we have an index key before, set last_dir_index_offset + * to its offset value, otherwise leave it with a value right before the + * first valid index value, as it means we have an empty directory. + */ + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0] - 1); + if (key.objectid == ino && key.type == BTRFS_DIR_INDEX_KEY) + inode->last_dir_index_offset = key.offset; + +out: + btrfs_release_path(path); + + return ret; +} + +/* * logging directories is very similar to logging inodes, We find all the items * from the current transaction and write them to the log. * @@ -3733,7 +4033,7 @@ done: * key logged by this transaction. */ static noinline int log_directory_changes(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, + struct btrfs_inode *inode, struct btrfs_path *path, struct btrfs_path *dst_path, struct btrfs_log_ctx *ctx) @@ -3741,13 +4041,17 @@ static noinline int log_directory_changes(struct btrfs_trans_handle *trans, u64 min_key; u64 max_key; int ret; - int key_type = BTRFS_DIR_ITEM_KEY; -again: - min_key = 0; + ret = update_last_dir_index_offset(inode, path, ctx); + if (ret) + return ret; + + min_key = BTRFS_DIR_START_INDEX; max_key = 0; + ctx->last_dir_item_offset = inode->last_dir_index_offset; + while (1) { - ret = log_dir_items(trans, root, inode, path, dst_path, key_type, + ret = log_dir_items(trans, inode, path, dst_path, ctx, min_key, &max_key); if (ret) return ret; @@ -3756,10 +4060,8 @@ again: min_key = max_key + 1; } - if (key_type == BTRFS_DIR_ITEM_KEY) { - key_type = BTRFS_DIR_INDEX_KEY; - goto again; - } + inode->last_dir_index_offset = ctx->last_dir_item_offset; + return 0; } @@ -3769,17 +4071,18 @@ again: * This cannot be run for file data extents because it does not * free the extents they point to. */ -static int drop_objectid_items(struct btrfs_trans_handle *trans, +static int drop_inode_items(struct btrfs_trans_handle *trans, struct btrfs_root *log, struct btrfs_path *path, - u64 objectid, int max_key_type) + struct btrfs_inode *inode, + int max_key_type) { int ret; struct btrfs_key key; struct btrfs_key found_key; int start_slot; - key.objectid = objectid; + key.objectid = btrfs_ino(inode); key.type = max_key_type; key.offset = (u64)-1; @@ -3796,13 +4099,12 @@ static int drop_objectid_items(struct btrfs_trans_handle *trans, btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); - if (found_key.objectid != objectid) + if (found_key.objectid != key.objectid) break; found_key.offset = 0; found_key.type = 0; - ret = btrfs_bin_search(path->nodes[0], &found_key, 0, - &start_slot); + ret = btrfs_bin_search(path->nodes[0], &found_key, &start_slot); if (ret < 0) break; @@ -3822,6 +4124,21 @@ static int drop_objectid_items(struct btrfs_trans_handle *trans, return ret; } +static int truncate_inode_items(struct btrfs_trans_handle *trans, + struct btrfs_root *log_root, + struct btrfs_inode *inode, + u64 new_size, u32 min_type) +{ + struct btrfs_truncate_control control = { + .new_size = new_size, + .ino = btrfs_ino(inode), + .min_type = min_type, + .skip_ref_updates = true, + }; + + return btrfs_truncate_inode_items(trans, log_root, &control); +} + static void fill_inode_item(struct btrfs_trans_handle *trans, struct extent_buffer *leaf, struct btrfs_inode_item *item, @@ -3829,6 +4146,7 @@ static void fill_inode_item(struct btrfs_trans_handle *trans, u64 logged_isize) { struct btrfs_map_token token; + u64 flags; btrfs_init_map_token(&token, leaf); @@ -3838,56 +4156,89 @@ static void fill_inode_item(struct btrfs_trans_handle *trans, * just to say 'this inode exists' and a logging * to say 'update this inode with these values' */ - btrfs_set_token_inode_generation(leaf, item, 0, &token); - btrfs_set_token_inode_size(leaf, item, logged_isize, &token); + btrfs_set_token_inode_generation(&token, item, 0); + btrfs_set_token_inode_size(&token, item, logged_isize); } else { - btrfs_set_token_inode_generation(leaf, item, - BTRFS_I(inode)->generation, - &token); - btrfs_set_token_inode_size(leaf, item, inode->i_size, &token); - } - - btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); - btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); - btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); - btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); - - btrfs_set_token_timespec_sec(leaf, &item->atime, - inode->i_atime.tv_sec, &token); - btrfs_set_token_timespec_nsec(leaf, &item->atime, - inode->i_atime.tv_nsec, &token); - - btrfs_set_token_timespec_sec(leaf, &item->mtime, - inode->i_mtime.tv_sec, &token); - btrfs_set_token_timespec_nsec(leaf, &item->mtime, - inode->i_mtime.tv_nsec, &token); - - btrfs_set_token_timespec_sec(leaf, &item->ctime, - inode->i_ctime.tv_sec, &token); - btrfs_set_token_timespec_nsec(leaf, &item->ctime, - inode->i_ctime.tv_nsec, &token); - - btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), - &token); - - btrfs_set_token_inode_sequence(leaf, item, - inode_peek_iversion(inode), &token); - btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); - btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); - btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); - btrfs_set_token_inode_block_group(leaf, item, 0, &token); + btrfs_set_token_inode_generation(&token, item, + BTRFS_I(inode)->generation); + btrfs_set_token_inode_size(&token, item, inode->i_size); + } + + btrfs_set_token_inode_uid(&token, item, i_uid_read(inode)); + btrfs_set_token_inode_gid(&token, item, i_gid_read(inode)); + btrfs_set_token_inode_mode(&token, item, inode->i_mode); + btrfs_set_token_inode_nlink(&token, item, inode->i_nlink); + + btrfs_set_token_timespec_sec(&token, &item->atime, + inode->i_atime.tv_sec); + btrfs_set_token_timespec_nsec(&token, &item->atime, + inode->i_atime.tv_nsec); + + btrfs_set_token_timespec_sec(&token, &item->mtime, + inode->i_mtime.tv_sec); + btrfs_set_token_timespec_nsec(&token, &item->mtime, + inode->i_mtime.tv_nsec); + + btrfs_set_token_timespec_sec(&token, &item->ctime, + inode->i_ctime.tv_sec); + btrfs_set_token_timespec_nsec(&token, &item->ctime, + inode->i_ctime.tv_nsec); + + /* + * We do not need to set the nbytes field, in fact during a fast fsync + * its value may not even be correct, since a fast fsync does not wait + * for ordered extent completion, which is where we update nbytes, it + * only waits for writeback to complete. During log replay as we find + * file extent items and replay them, we adjust the nbytes field of the + * inode item in subvolume tree as needed (see overwrite_item()). + */ + + btrfs_set_token_inode_sequence(&token, item, inode_peek_iversion(inode)); + btrfs_set_token_inode_transid(&token, item, trans->transid); + btrfs_set_token_inode_rdev(&token, item, inode->i_rdev); + flags = btrfs_inode_combine_flags(BTRFS_I(inode)->flags, + BTRFS_I(inode)->ro_flags); + btrfs_set_token_inode_flags(&token, item, flags); + btrfs_set_token_inode_block_group(&token, item, 0); } static int log_inode_item(struct btrfs_trans_handle *trans, struct btrfs_root *log, struct btrfs_path *path, - struct btrfs_inode *inode) + struct btrfs_inode *inode, bool inode_item_dropped) { struct btrfs_inode_item *inode_item; int ret; - ret = btrfs_insert_empty_item(trans, log, path, - &inode->location, sizeof(*inode_item)); - if (ret && ret != -EEXIST) + /* + * If we are doing a fast fsync and the inode was logged before in the + * current transaction, then we know the inode was previously logged and + * it exists in the log tree. For performance reasons, in this case use + * btrfs_search_slot() directly with ins_len set to 0 so that we never + * attempt a write lock on the leaf's parent, which adds unnecessary lock + * contention in case there are concurrent fsyncs for other inodes of the + * same subvolume. Using btrfs_insert_empty_item() when the inode item + * already exists can also result in unnecessarily splitting a leaf. + */ + if (!inode_item_dropped && inode->logged_trans == trans->transid) { + ret = btrfs_search_slot(trans, log, &inode->location, path, 0, 1); + ASSERT(ret <= 0); + if (ret > 0) + ret = -ENOENT; + } else { + /* + * This means it is the first fsync in the current transaction, + * so the inode item is not in the log and we need to insert it. + * We can never get -EEXIST because we are only called for a fast + * fsync and in case an inode eviction happens after the inode was + * logged before in the current transaction, when we load again + * the inode, we set BTRFS_INODE_NEEDS_FULL_SYNC on its runtime + * flags and set ->logged_trans to 0. + */ + ret = btrfs_insert_empty_item(trans, log, path, &inode->location, + sizeof(*inode_item)); + ASSERT(ret != -EEXIST); + } + if (ret) return ret; inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], struct btrfs_inode_item); @@ -3898,12 +4249,33 @@ static int log_inode_item(struct btrfs_trans_handle *trans, } static int log_csums(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, struct btrfs_root *log_root, struct btrfs_ordered_sum *sums) { + const u64 lock_end = sums->bytenr + sums->len - 1; + struct extent_state *cached_state = NULL; int ret; /* + * If this inode was not used for reflink operations in the current + * transaction with new extents, then do the fast path, no need to + * worry about logging checksum items with overlapping ranges. + */ + if (inode->last_reflink_trans < trans->transid) + return btrfs_csum_file_blocks(trans, log_root, sums); + + /* + * Serialize logging for checksums. This is to avoid racing with the + * same checksum being logged by another task that is logging another + * file which happens to refer to the same extent as well. Such races + * can leave checksum items in the log with overlapping ranges. + */ + ret = lock_extent(&log_root->log_csum_range, sums->bytenr, lock_end, + &cached_state); + if (ret) + return ret; + /* * Due to extent cloning, we might have logged a csum item that covers a * subrange of a cloned extent, and later we can end up logging a csum * item for a larger subrange of the same extent or the entire range. @@ -3913,10 +4285,13 @@ static int log_csums(struct btrfs_trans_handle *trans, * trim and adjust) any existing csum items in the log for this range. */ ret = btrfs_del_csums(trans, log_root, sums->bytenr, sums->len); - if (ret) - return ret; + if (!ret) + ret = btrfs_csum_file_blocks(trans, log_root, sums); + + unlock_extent(&log_root->log_csum_range, sums->bytenr, lock_end, + &cached_state); - return btrfs_csum_file_blocks(trans, log_root, sums); + return ret; } static noinline int copy_items(struct btrfs_trans_handle *trans, @@ -3926,22 +4301,18 @@ static noinline int copy_items(struct btrfs_trans_handle *trans, int start_slot, int nr, int inode_only, u64 logged_isize) { - struct btrfs_fs_info *fs_info = trans->fs_info; - unsigned long src_offset; - unsigned long dst_offset; struct btrfs_root *log = inode->root->log_root; struct btrfs_file_extent_item *extent; - struct btrfs_inode_item *inode_item; struct extent_buffer *src = src_path->nodes[0]; - int ret; + int ret = 0; struct btrfs_key *ins_keys; u32 *ins_sizes; + struct btrfs_item_batch batch; char *ins_data; int i; - struct list_head ordered_sums; - int skip_csum = inode->flags & BTRFS_INODE_NODATASUM; - - INIT_LIST_HEAD(&ordered_sums); + int dst_index; + const bool skip_csum = (inode->flags & BTRFS_INODE_NODATASUM); + const u64 i_size = i_size_read(&inode->vfs_inode); ins_data = kmalloc(nr * sizeof(struct btrfs_key) + nr * sizeof(u32), GFP_NOFS); @@ -3950,27 +4321,155 @@ static noinline int copy_items(struct btrfs_trans_handle *trans, ins_sizes = (u32 *)ins_data; ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); + batch.keys = ins_keys; + batch.data_sizes = ins_sizes; + batch.total_data_size = 0; + batch.nr = 0; + dst_index = 0; for (i = 0; i < nr; i++) { - ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); - btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); - } - ret = btrfs_insert_empty_items(trans, log, dst_path, - ins_keys, ins_sizes, nr); - if (ret) { - kfree(ins_data); - return ret; + const int src_slot = start_slot + i; + struct btrfs_root *csum_root; + struct btrfs_ordered_sum *sums; + struct btrfs_ordered_sum *sums_next; + LIST_HEAD(ordered_sums); + u64 disk_bytenr; + u64 disk_num_bytes; + u64 extent_offset; + u64 extent_num_bytes; + bool is_old_extent; + + btrfs_item_key_to_cpu(src, &ins_keys[dst_index], src_slot); + + if (ins_keys[dst_index].type != BTRFS_EXTENT_DATA_KEY) + goto add_to_batch; + + extent = btrfs_item_ptr(src, src_slot, + struct btrfs_file_extent_item); + + is_old_extent = (btrfs_file_extent_generation(src, extent) < + trans->transid); + + /* + * Don't copy extents from past generations. That would make us + * log a lot more metadata for common cases like doing only a + * few random writes into a file and then fsync it for the first + * time or after the full sync flag is set on the inode. We can + * get leaves full of extent items, most of which are from past + * generations, so we can skip them - as long as the inode has + * not been the target of a reflink operation in this transaction, + * as in that case it might have had file extent items with old + * generations copied into it. We also must always log prealloc + * extents that start at or beyond eof, otherwise we would lose + * them on log replay. + */ + if (is_old_extent && + ins_keys[dst_index].offset < i_size && + inode->last_reflink_trans < trans->transid) + continue; + + if (skip_csum) + goto add_to_batch; + + /* Only regular extents have checksums. */ + if (btrfs_file_extent_type(src, extent) != BTRFS_FILE_EXTENT_REG) + goto add_to_batch; + + /* + * If it's an extent created in a past transaction, then its + * checksums are already accessible from the committed csum tree, + * no need to log them. + */ + if (is_old_extent) + goto add_to_batch; + + disk_bytenr = btrfs_file_extent_disk_bytenr(src, extent); + /* If it's an explicit hole, there are no checksums. */ + if (disk_bytenr == 0) + goto add_to_batch; + + disk_num_bytes = btrfs_file_extent_disk_num_bytes(src, extent); + + if (btrfs_file_extent_compression(src, extent)) { + extent_offset = 0; + extent_num_bytes = disk_num_bytes; + } else { + extent_offset = btrfs_file_extent_offset(src, extent); + extent_num_bytes = btrfs_file_extent_num_bytes(src, extent); + } + + csum_root = btrfs_csum_root(trans->fs_info, disk_bytenr); + disk_bytenr += extent_offset; + ret = btrfs_lookup_csums_range(csum_root, disk_bytenr, + disk_bytenr + extent_num_bytes - 1, + &ordered_sums, 0, false); + if (ret) + goto out; + + list_for_each_entry_safe(sums, sums_next, &ordered_sums, list) { + if (!ret) + ret = log_csums(trans, inode, log, sums); + list_del(&sums->list); + kfree(sums); + } + if (ret) + goto out; + +add_to_batch: + ins_sizes[dst_index] = btrfs_item_size(src, src_slot); + batch.total_data_size += ins_sizes[dst_index]; + batch.nr++; + dst_index++; } - for (i = 0; i < nr; i++, dst_path->slots[0]++) { - dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], - dst_path->slots[0]); + /* + * We have a leaf full of old extent items that don't need to be logged, + * so we don't need to do anything. + */ + if (batch.nr == 0) + goto out; + + ret = btrfs_insert_empty_items(trans, log, dst_path, &batch); + if (ret) + goto out; + + dst_index = 0; + for (i = 0; i < nr; i++) { + const int src_slot = start_slot + i; + const int dst_slot = dst_path->slots[0] + dst_index; + struct btrfs_key key; + unsigned long src_offset; + unsigned long dst_offset; + + /* + * We're done, all the remaining items in the source leaf + * correspond to old file extent items. + */ + if (dst_index >= batch.nr) + break; + + btrfs_item_key_to_cpu(src, &key, src_slot); - src_offset = btrfs_item_ptr_offset(src, start_slot + i); + if (key.type != BTRFS_EXTENT_DATA_KEY) + goto copy_item; + + extent = btrfs_item_ptr(src, src_slot, + struct btrfs_file_extent_item); - if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { - inode_item = btrfs_item_ptr(dst_path->nodes[0], - dst_path->slots[0], + /* See the comment in the previous loop, same logic. */ + if (btrfs_file_extent_generation(src, extent) < trans->transid && + key.offset < i_size && + inode->last_reflink_trans < trans->transid) + continue; + +copy_item: + dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], dst_slot); + src_offset = btrfs_item_ptr_offset(src, src_slot); + + if (key.type == BTRFS_INODE_ITEM_KEY) { + struct btrfs_inode_item *inode_item; + + inode_item = btrfs_item_ptr(dst_path->nodes[0], dst_slot, struct btrfs_inode_item); fill_inode_item(trans, dst_path->nodes[0], inode_item, &inode->vfs_inode, @@ -3978,80 +4477,24 @@ static noinline int copy_items(struct btrfs_trans_handle *trans, logged_isize); } else { copy_extent_buffer(dst_path->nodes[0], src, dst_offset, - src_offset, ins_sizes[i]); + src_offset, ins_sizes[dst_index]); } - /* take a reference on file data extents so that truncates - * or deletes of this inode don't have to relog the inode - * again - */ - if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY && - !skip_csum) { - int found_type; - extent = btrfs_item_ptr(src, start_slot + i, - struct btrfs_file_extent_item); - - if (btrfs_file_extent_generation(src, extent) < trans->transid) - continue; - - found_type = btrfs_file_extent_type(src, extent); - if (found_type == BTRFS_FILE_EXTENT_REG) { - u64 ds, dl, cs, cl; - ds = btrfs_file_extent_disk_bytenr(src, - extent); - /* ds == 0 is a hole */ - if (ds == 0) - continue; - - dl = btrfs_file_extent_disk_num_bytes(src, - extent); - cs = btrfs_file_extent_offset(src, extent); - cl = btrfs_file_extent_num_bytes(src, - extent); - if (btrfs_file_extent_compression(src, - extent)) { - cs = 0; - cl = dl; - } - - ret = btrfs_lookup_csums_range( - fs_info->csum_root, - ds + cs, ds + cs + cl - 1, - &ordered_sums, 0); - if (ret) { - btrfs_release_path(dst_path); - kfree(ins_data); - return ret; - } - } - } + dst_index++; } btrfs_mark_buffer_dirty(dst_path->nodes[0]); btrfs_release_path(dst_path); +out: kfree(ins_data); - /* - * we have to do this after the loop above to avoid changing the - * log tree while trying to change the log tree. - */ - ret = 0; - while (!list_empty(&ordered_sums)) { - struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, - struct btrfs_ordered_sum, - list); - if (!ret) - ret = log_csums(trans, log, sums); - list_del(&sums->list); - kfree(sums); - } - return ret; } -static int extent_cmp(void *priv, struct list_head *a, struct list_head *b) +static int extent_cmp(void *priv, const struct list_head *a, + const struct list_head *b) { - struct extent_map *em1, *em2; + const struct extent_map *em1, *em2; em1 = list_entry(a, struct extent_map, list); em2 = list_entry(b, struct extent_map, list); @@ -4066,10 +4509,15 @@ static int extent_cmp(void *priv, struct list_head *a, struct list_head *b) static int log_extent_csums(struct btrfs_trans_handle *trans, struct btrfs_inode *inode, struct btrfs_root *log_root, - const struct extent_map *em) + const struct extent_map *em, + struct btrfs_log_ctx *ctx) { + struct btrfs_ordered_extent *ordered; + struct btrfs_root *csum_root; u64 csum_offset; u64 csum_len; + u64 mod_start = em->mod_start; + u64 mod_len = em->mod_len; LIST_HEAD(ordered_sums); int ret = 0; @@ -4078,20 +4526,79 @@ static int log_extent_csums(struct btrfs_trans_handle *trans, em->block_start == EXTENT_MAP_HOLE) return 0; + list_for_each_entry(ordered, &ctx->ordered_extents, log_list) { + const u64 ordered_end = ordered->file_offset + ordered->num_bytes; + const u64 mod_end = mod_start + mod_len; + struct btrfs_ordered_sum *sums; + + if (mod_len == 0) + break; + + if (ordered_end <= mod_start) + continue; + if (mod_end <= ordered->file_offset) + break; + + /* + * We are going to copy all the csums on this ordered extent, so + * go ahead and adjust mod_start and mod_len in case this ordered + * extent has already been logged. + */ + if (ordered->file_offset > mod_start) { + if (ordered_end >= mod_end) + mod_len = ordered->file_offset - mod_start; + /* + * If we have this case + * + * |--------- logged extent ---------| + * |----- ordered extent ----| + * + * Just don't mess with mod_start and mod_len, we'll + * just end up logging more csums than we need and it + * will be ok. + */ + } else { + if (ordered_end < mod_end) { + mod_len = mod_end - ordered_end; + mod_start = ordered_end; + } else { + mod_len = 0; + } + } + + /* + * To keep us from looping for the above case of an ordered + * extent that falls inside of the logged extent. + */ + if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM, &ordered->flags)) + continue; + + list_for_each_entry(sums, &ordered->list, list) { + ret = log_csums(trans, inode, log_root, sums); + if (ret) + return ret; + } + } + + /* We're done, found all csums in the ordered extents. */ + if (mod_len == 0) + return 0; + /* If we're compressed we have to save the entire range of csums. */ if (em->compress_type) { csum_offset = 0; csum_len = max(em->block_len, em->orig_block_len); } else { - csum_offset = em->mod_start - em->start; - csum_len = em->mod_len; + csum_offset = mod_start - em->start; + csum_len = mod_len; } /* block start is already adjusted for the file extent offset. */ - ret = btrfs_lookup_csums_range(trans->fs_info->csum_root, + csum_root = btrfs_csum_root(trans->fs_info, em->block_start); + ret = btrfs_lookup_csums_range(csum_root, em->block_start + csum_offset, em->block_start + csum_offset + - csum_len - 1, &ordered_sums, 0); + csum_len - 1, &ordered_sums, 0, false); if (ret) return ret; @@ -4100,7 +4607,7 @@ static int log_extent_csums(struct btrfs_trans_handle *trans, struct btrfs_ordered_sum, list); if (!ret) - ret = log_csums(trans, log_root, sums); + ret = log_csums(trans, inode, log_root, sums); list_del(&sums->list); kfree(sums); } @@ -4109,83 +4616,79 @@ static int log_extent_csums(struct btrfs_trans_handle *trans, } static int log_one_extent(struct btrfs_trans_handle *trans, - struct btrfs_inode *inode, struct btrfs_root *root, + struct btrfs_inode *inode, const struct extent_map *em, struct btrfs_path *path, struct btrfs_log_ctx *ctx) { - struct btrfs_root *log = root->log_root; - struct btrfs_file_extent_item *fi; + struct btrfs_drop_extents_args drop_args = { 0 }; + struct btrfs_root *log = inode->root->log_root; + struct btrfs_file_extent_item fi = { 0 }; struct extent_buffer *leaf; - struct btrfs_map_token token; struct btrfs_key key; u64 extent_offset = em->start - em->orig_start; u64 block_len; int ret; - int extent_inserted = 0; - ret = log_extent_csums(trans, inode, log, em); - if (ret) - return ret; + btrfs_set_stack_file_extent_generation(&fi, trans->transid); + if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) + btrfs_set_stack_file_extent_type(&fi, BTRFS_FILE_EXTENT_PREALLOC); + else + btrfs_set_stack_file_extent_type(&fi, BTRFS_FILE_EXTENT_REG); + + block_len = max(em->block_len, em->orig_block_len); + if (em->compress_type != BTRFS_COMPRESS_NONE) { + btrfs_set_stack_file_extent_disk_bytenr(&fi, em->block_start); + btrfs_set_stack_file_extent_disk_num_bytes(&fi, block_len); + } else if (em->block_start < EXTENT_MAP_LAST_BYTE) { + btrfs_set_stack_file_extent_disk_bytenr(&fi, em->block_start - + extent_offset); + btrfs_set_stack_file_extent_disk_num_bytes(&fi, block_len); + } + + btrfs_set_stack_file_extent_offset(&fi, extent_offset); + btrfs_set_stack_file_extent_num_bytes(&fi, em->len); + btrfs_set_stack_file_extent_ram_bytes(&fi, em->ram_bytes); + btrfs_set_stack_file_extent_compression(&fi, em->compress_type); - ret = __btrfs_drop_extents(trans, log, &inode->vfs_inode, path, em->start, - em->start + em->len, NULL, 0, 1, - sizeof(*fi), &extent_inserted); + ret = log_extent_csums(trans, inode, log, em, ctx); if (ret) return ret; - if (!extent_inserted) { + /* + * If this is the first time we are logging the inode in the current + * transaction, we can avoid btrfs_drop_extents(), which is expensive + * because it does a deletion search, which always acquires write locks + * for extent buffers at levels 2, 1 and 0. This not only wastes time + * but also adds significant contention in a log tree, since log trees + * are small, with a root at level 2 or 3 at most, due to their short + * life span. + */ + if (ctx->logged_before) { + drop_args.path = path; + drop_args.start = em->start; + drop_args.end = em->start + em->len; + drop_args.replace_extent = true; + drop_args.extent_item_size = sizeof(fi); + ret = btrfs_drop_extents(trans, log, inode, &drop_args); + if (ret) + return ret; + } + + if (!drop_args.extent_inserted) { key.objectid = btrfs_ino(inode); key.type = BTRFS_EXTENT_DATA_KEY; key.offset = em->start; ret = btrfs_insert_empty_item(trans, log, path, &key, - sizeof(*fi)); + sizeof(fi)); if (ret) return ret; } leaf = path->nodes[0]; - btrfs_init_map_token(&token, leaf); - fi = btrfs_item_ptr(leaf, path->slots[0], - struct btrfs_file_extent_item); - - btrfs_set_token_file_extent_generation(leaf, fi, trans->transid, - &token); - if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) - btrfs_set_token_file_extent_type(leaf, fi, - BTRFS_FILE_EXTENT_PREALLOC, - &token); - else - btrfs_set_token_file_extent_type(leaf, fi, - BTRFS_FILE_EXTENT_REG, - &token); - - block_len = max(em->block_len, em->orig_block_len); - if (em->compress_type != BTRFS_COMPRESS_NONE) { - btrfs_set_token_file_extent_disk_bytenr(leaf, fi, - em->block_start, - &token); - btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, - &token); - } else if (em->block_start < EXTENT_MAP_LAST_BYTE) { - btrfs_set_token_file_extent_disk_bytenr(leaf, fi, - em->block_start - - extent_offset, &token); - btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, - &token); - } else { - btrfs_set_token_file_extent_disk_bytenr(leaf, fi, 0, &token); - btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, 0, - &token); - } - - btrfs_set_token_file_extent_offset(leaf, fi, extent_offset, &token); - btrfs_set_token_file_extent_num_bytes(leaf, fi, em->len, &token); - btrfs_set_token_file_extent_ram_bytes(leaf, fi, em->ram_bytes, &token); - btrfs_set_token_file_extent_compression(leaf, fi, em->compress_type, - &token); - btrfs_set_token_file_extent_encryption(leaf, fi, 0, &token); - btrfs_set_token_file_extent_other_encoding(leaf, fi, 0, &token); + write_extent_buffer(leaf, &fi, + btrfs_item_ptr_offset(leaf, path->slots[0]), + sizeof(fi)); btrfs_mark_buffer_dirty(leaf); btrfs_release_path(path); @@ -4195,7 +4698,7 @@ static int log_one_extent(struct btrfs_trans_handle *trans, /* * Log all prealloc extents beyond the inode's i_size to make sure we do not - * lose them after doing a fast fsync and replaying the log. We scan the + * lose them after doing a full/fast fsync and replaying the log. We scan the * subvolume's root instead of iterating the inode's extent map tree because * otherwise we can log incorrect extent items based on extent map conversion. * That can happen due to the fact that extent maps are merged when they @@ -4211,6 +4714,9 @@ static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans, const u64 ino = btrfs_ino(inode); struct btrfs_path *dst_path = NULL; bool dropped_extents = false; + u64 truncate_offset = i_size; + struct extent_buffer *leaf; + int slot; int ins_nr = 0; int start_slot; int ret; @@ -4225,9 +4731,43 @@ static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans, if (ret < 0) goto out; + /* + * We must check if there is a prealloc extent that starts before the + * i_size and crosses the i_size boundary. This is to ensure later we + * truncate down to the end of that extent and not to the i_size, as + * otherwise we end up losing part of the prealloc extent after a log + * replay and with an implicit hole if there is another prealloc extent + * that starts at an offset beyond i_size. + */ + ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY); + if (ret < 0) + goto out; + + if (ret == 0) { + struct btrfs_file_extent_item *ei; + + leaf = path->nodes[0]; + slot = path->slots[0]; + ei = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); + + if (btrfs_file_extent_type(leaf, ei) == + BTRFS_FILE_EXTENT_PREALLOC) { + u64 extent_end; + + btrfs_item_key_to_cpu(leaf, &key, slot); + extent_end = key.offset + + btrfs_file_extent_num_bytes(leaf, ei); + + if (extent_end > i_size) + truncate_offset = extent_end; + } + } else { + ret = 0; + } + while (true) { - struct extent_buffer *leaf = path->nodes[0]; - int slot = path->slots[0]; + leaf = path->nodes[0]; + slot = path->slots[0]; if (slot >= btrfs_header_nritems(leaf)) { if (ins_nr > 0) { @@ -4261,13 +4801,9 @@ static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans, * Avoid logging extent items logged in past fsync calls * and leading to duplicate keys in the log tree. */ - do { - ret = btrfs_truncate_inode_items(trans, - root->log_root, - &inode->vfs_inode, - i_size, - BTRFS_EXTENT_DATA_KEY); - } while (ret == -EAGAIN); + ret = truncate_inode_items(trans, root->log_root, inode, + truncate_offset, + BTRFS_EXTENT_DATA_KEY); if (ret) goto out; dropped_extents = true; @@ -4284,12 +4820,9 @@ static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans, } } } - if (ins_nr > 0) { + if (ins_nr > 0) ret = copy_items(trans, inode, dst_path, path, start_slot, ins_nr, 1, 0); - if (ret > 0) - ret = 0; - } out: btrfs_release_path(path); btrfs_free_path(dst_path); @@ -4297,43 +4830,23 @@ out: } static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, struct btrfs_path *path, - struct btrfs_log_ctx *ctx, - const u64 start, - const u64 end) + struct btrfs_log_ctx *ctx) { + struct btrfs_ordered_extent *ordered; + struct btrfs_ordered_extent *tmp; struct extent_map *em, *n; struct list_head extents; struct extent_map_tree *tree = &inode->extent_tree; - u64 test_gen; int ret = 0; int num = 0; INIT_LIST_HEAD(&extents); write_lock(&tree->lock); - test_gen = root->fs_info->last_trans_committed; list_for_each_entry_safe(em, n, &tree->modified_extents, list) { - /* - * Skip extents outside our logging range. It's important to do - * it for correctness because if we don't ignore them, we may - * log them before their ordered extent completes, and therefore - * we could log them without logging their respective checksums - * (the checksum items are added to the csum tree at the very - * end of btrfs_finish_ordered_io()). Also leave such extents - * outside of our range in the list, since we may have another - * ranged fsync in the near future that needs them. If an extent - * outside our range corresponds to a hole, log it to avoid - * leaving gaps between extents (fsck will complain when we are - * not using the NO_HOLES feature). - */ - if ((em->start > end || em->start + em->len <= start) && - em->block_start != EXTENT_MAP_HOLE) - continue; - list_del_init(&em->list); /* * Just an arbitrary number, this can be really CPU intensive @@ -4347,7 +4860,7 @@ static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans, goto process; } - if (em->generation <= test_gen) + if (em->generation < trans->transid) continue; /* We log prealloc extents beyond eof later. */ @@ -4381,7 +4894,7 @@ process: write_unlock(&tree->lock); - ret = log_one_extent(trans, inode, root, em, path, ctx); + ret = log_one_extent(trans, inode, em, path, ctx); write_lock(&tree->lock); clear_em_logging(tree, em); free_extent_map(em); @@ -4389,11 +4902,34 @@ process: WARN_ON(!list_empty(&extents)); write_unlock(&tree->lock); - btrfs_release_path(path); if (!ret) ret = btrfs_log_prealloc_extents(trans, inode, path); + if (ret) + return ret; - return ret; + /* + * We have logged all extents successfully, now make sure the commit of + * the current transaction waits for the ordered extents to complete + * before it commits and wipes out the log trees, otherwise we would + * lose data if an ordered extents completes after the transaction + * commits and a power failure happens after the transaction commit. + */ + list_for_each_entry_safe(ordered, tmp, &ctx->ordered_extents, log_list) { + list_del_init(&ordered->log_list); + set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags); + + if (!test_bit(BTRFS_ORDERED_COMPLETE, &ordered->flags)) { + spin_lock_irq(&inode->ordered_tree.lock); + if (!test_bit(BTRFS_ORDERED_COMPLETE, &ordered->flags)) { + set_bit(BTRFS_ORDERED_PENDING, &ordered->flags); + atomic_inc(&trans->transaction->pending_ordered); + } + spin_unlock_irq(&inode->ordered_tree.lock); + } + btrfs_put_ordered_extent(ordered); + } + + return 0; } static int logged_inode_size(struct btrfs_root *log, struct btrfs_inode *inode, @@ -4446,16 +4982,20 @@ static int logged_inode_size(struct btrfs_root *log, struct btrfs_inode *inode, * with a journal, ext3/4, xfs, f2fs, etc). */ static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, struct btrfs_path *path, struct btrfs_path *dst_path) { + struct btrfs_root *root = inode->root; int ret; struct btrfs_key key; const u64 ino = btrfs_ino(inode); int ins_nr = 0; int start_slot = 0; + bool found_xattrs = false; + + if (test_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags)) + return 0; key.objectid = ino; key.type = BTRFS_XATTR_ITEM_KEY; @@ -4494,6 +5034,7 @@ static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, start_slot = slot; ins_nr++; path->slots[0]++; + found_xattrs = true; cond_resched(); } if (ins_nr > 0) { @@ -4503,6 +5044,9 @@ static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, return ret; } + if (!found_xattrs) + set_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags); + return 0; } @@ -4516,10 +5060,10 @@ static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, * truncate operation that changes the inode's size. */ static int btrfs_log_holes(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, struct btrfs_path *path) { + struct btrfs_root *root = inode->root; struct btrfs_fs_info *fs_info = root->fs_info; struct btrfs_key key; const u64 ino = btrfs_ino(inode); @@ -4539,9 +5083,7 @@ static int btrfs_log_holes(struct btrfs_trans_handle *trans, return ret; while (true) { - struct btrfs_file_extent_item *extent; struct extent_buffer *leaf = path->nodes[0]; - u64 len; if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { ret = btrfs_next_leaf(root, path); @@ -4568,10 +5110,9 @@ static int btrfs_log_holes(struct btrfs_trans_handle *trans, * leafs from the log root. */ btrfs_release_path(path); - ret = btrfs_insert_file_extent(trans, root->log_root, - ino, prev_extent_end, 0, - 0, hole_len, 0, hole_len, - 0, 0, 0); + ret = btrfs_insert_hole_extent(trans, root->log_root, + ino, prev_extent_end, + hole_len); if (ret < 0) return ret; @@ -4590,18 +5131,7 @@ static int btrfs_log_holes(struct btrfs_trans_handle *trans, leaf = path->nodes[0]; } - extent = btrfs_item_ptr(leaf, path->slots[0], - struct btrfs_file_extent_item); - if (btrfs_file_extent_type(leaf, extent) == - BTRFS_FILE_EXTENT_INLINE) { - len = btrfs_file_extent_ram_bytes(leaf, extent); - prev_extent_end = ALIGN(key.offset + len, - fs_info->sectorsize); - } else { - len = btrfs_file_extent_num_bytes(leaf, extent); - prev_extent_end = key.offset + len; - } - + prev_extent_end = btrfs_file_extent_end(path); path->slots[0]++; cond_resched(); } @@ -4611,10 +5141,8 @@ static int btrfs_log_holes(struct btrfs_trans_handle *trans, btrfs_release_path(path); hole_len = ALIGN(i_size - prev_extent_end, fs_info->sectorsize); - ret = btrfs_insert_file_extent(trans, root->log_root, - ino, prev_extent_end, 0, 0, - hole_len, 0, hole_len, - 0, 0, 0); + ret = btrfs_insert_hole_extent(trans, root->log_root, ino, + prev_extent_end, hole_len); if (ret < 0) return ret; } @@ -4674,7 +5202,7 @@ static int btrfs_check_ref_name_override(struct extent_buffer *eb, struct btrfs_path *search_path; char *name = NULL; u32 name_len = 0; - u32 item_size = btrfs_item_size_nr(eb, slot); + u32 item_size = btrfs_item_size(eb, slot); u32 cur_offset = 0; unsigned long ptr = btrfs_item_ptr_offset(eb, slot); @@ -4757,115 +5285,461 @@ out: return ret; } +/* + * Check if we need to log an inode. This is used in contexts where while + * logging an inode we need to log another inode (either that it exists or in + * full mode). This is used instead of btrfs_inode_in_log() because the later + * requires the inode to be in the log and have the log transaction committed, + * while here we do not care if the log transaction was already committed - our + * caller will commit the log later - and we want to avoid logging an inode + * multiple times when multiple tasks have joined the same log transaction. + */ +static bool need_log_inode(const struct btrfs_trans_handle *trans, + const struct btrfs_inode *inode) +{ + /* + * If a directory was not modified, no dentries added or removed, we can + * and should avoid logging it. + */ + if (S_ISDIR(inode->vfs_inode.i_mode) && inode->last_trans < trans->transid) + return false; + + /* + * If this inode does not have new/updated/deleted xattrs since the last + * time it was logged and is flagged as logged in the current transaction, + * we can skip logging it. As for new/deleted names, those are updated in + * the log by link/unlink/rename operations. + * In case the inode was logged and then evicted and reloaded, its + * logged_trans will be 0, in which case we have to fully log it since + * logged_trans is a transient field, not persisted. + */ + if (inode->logged_trans == trans->transid && + !test_bit(BTRFS_INODE_COPY_EVERYTHING, &inode->runtime_flags)) + return false; + + return true; +} + +struct btrfs_dir_list { + u64 ino; + struct list_head list; +}; + +/* + * Log the inodes of the new dentries of a directory. + * See process_dir_items_leaf() for details about why it is needed. + * This is a recursive operation - if an existing dentry corresponds to a + * directory, that directory's new entries are logged too (same behaviour as + * ext3/4, xfs, f2fs, reiserfs, nilfs2). Note that when logging the inodes + * the dentries point to we do not acquire their VFS lock, otherwise lockdep + * complains about the following circular lock dependency / possible deadlock: + * + * CPU0 CPU1 + * ---- ---- + * lock(&type->i_mutex_dir_key#3/2); + * lock(sb_internal#2); + * lock(&type->i_mutex_dir_key#3/2); + * lock(&sb->s_type->i_mutex_key#14); + * + * Where sb_internal is the lock (a counter that works as a lock) acquired by + * sb_start_intwrite() in btrfs_start_transaction(). + * Not acquiring the VFS lock of the inodes is still safe because: + * + * 1) For regular files we log with a mode of LOG_INODE_EXISTS. It's possible + * that while logging the inode new references (names) are added or removed + * from the inode, leaving the logged inode item with a link count that does + * not match the number of logged inode reference items. This is fine because + * at log replay time we compute the real number of links and correct the + * link count in the inode item (see replay_one_buffer() and + * link_to_fixup_dir()); + * + * 2) For directories we log with a mode of LOG_INODE_ALL. It's possible that + * while logging the inode's items new index items (key type + * BTRFS_DIR_INDEX_KEY) are added to fs/subvol tree and the logged inode item + * has a size that doesn't match the sum of the lengths of all the logged + * names - this is ok, not a problem, because at log replay time we set the + * directory's i_size to the correct value (see replay_one_name() and + * do_overwrite_item()). + */ +static int log_new_dir_dentries(struct btrfs_trans_handle *trans, + struct btrfs_inode *start_inode, + struct btrfs_log_ctx *ctx) +{ + struct btrfs_root *root = start_inode->root; + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_path *path; + LIST_HEAD(dir_list); + struct btrfs_dir_list *dir_elem; + u64 ino = btrfs_ino(start_inode); + int ret = 0; + + /* + * If we are logging a new name, as part of a link or rename operation, + * don't bother logging new dentries, as we just want to log the names + * of an inode and that any new parents exist. + */ + if (ctx->logging_new_name) + return 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + while (true) { + struct extent_buffer *leaf; + struct btrfs_key min_key; + bool continue_curr_inode = true; + int nritems; + int i; + + min_key.objectid = ino; + min_key.type = BTRFS_DIR_INDEX_KEY; + min_key.offset = 0; +again: + btrfs_release_path(path); + ret = btrfs_search_forward(root, &min_key, path, trans->transid); + if (ret < 0) { + break; + } else if (ret > 0) { + ret = 0; + goto next; + } + + leaf = path->nodes[0]; + nritems = btrfs_header_nritems(leaf); + for (i = path->slots[0]; i < nritems; i++) { + struct btrfs_dir_item *di; + struct btrfs_key di_key; + struct inode *di_inode; + int log_mode = LOG_INODE_EXISTS; + int type; + + btrfs_item_key_to_cpu(leaf, &min_key, i); + if (min_key.objectid != ino || + min_key.type != BTRFS_DIR_INDEX_KEY) { + continue_curr_inode = false; + break; + } + + di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item); + type = btrfs_dir_type(leaf, di); + if (btrfs_dir_transid(leaf, di) < trans->transid) + continue; + btrfs_dir_item_key_to_cpu(leaf, di, &di_key); + if (di_key.type == BTRFS_ROOT_ITEM_KEY) + continue; + + btrfs_release_path(path); + di_inode = btrfs_iget(fs_info->sb, di_key.objectid, root); + if (IS_ERR(di_inode)) { + ret = PTR_ERR(di_inode); + goto out; + } + + if (!need_log_inode(trans, BTRFS_I(di_inode))) { + btrfs_add_delayed_iput(di_inode); + break; + } + + ctx->log_new_dentries = false; + if (type == BTRFS_FT_DIR) + log_mode = LOG_INODE_ALL; + ret = btrfs_log_inode(trans, BTRFS_I(di_inode), + log_mode, ctx); + btrfs_add_delayed_iput(di_inode); + if (ret) + goto out; + if (ctx->log_new_dentries) { + dir_elem = kmalloc(sizeof(*dir_elem), GFP_NOFS); + if (!dir_elem) { + ret = -ENOMEM; + goto out; + } + dir_elem->ino = di_key.objectid; + list_add_tail(&dir_elem->list, &dir_list); + } + break; + } + + if (continue_curr_inode && min_key.offset < (u64)-1) { + min_key.offset++; + goto again; + } + +next: + if (list_empty(&dir_list)) + break; + + dir_elem = list_first_entry(&dir_list, struct btrfs_dir_list, list); + ino = dir_elem->ino; + list_del(&dir_elem->list); + kfree(dir_elem); + } +out: + btrfs_free_path(path); + if (ret) { + struct btrfs_dir_list *next; + + list_for_each_entry_safe(dir_elem, next, &dir_list, list) + kfree(dir_elem); + } + + return ret; +} + struct btrfs_ino_list { u64 ino; u64 parent; struct list_head list; }; -static int log_conflicting_inodes(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, - struct btrfs_log_ctx *ctx, - u64 ino, u64 parent) +static void free_conflicting_inodes(struct btrfs_log_ctx *ctx) +{ + struct btrfs_ino_list *curr; + struct btrfs_ino_list *next; + + list_for_each_entry_safe(curr, next, &ctx->conflict_inodes, list) { + list_del(&curr->list); + kfree(curr); + } +} + +static int conflicting_inode_is_dir(struct btrfs_root *root, u64 ino, + struct btrfs_path *path) +{ + struct btrfs_key key; + int ret; + + key.objectid = ino; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + + path->search_commit_root = 1; + path->skip_locking = 1; + + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + if (WARN_ON_ONCE(ret > 0)) { + /* + * We have previously found the inode through the commit root + * so this should not happen. If it does, just error out and + * fallback to a transaction commit. + */ + ret = -ENOENT; + } else if (ret == 0) { + struct btrfs_inode_item *item; + + item = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_inode_item); + if (S_ISDIR(btrfs_inode_mode(path->nodes[0], item))) + ret = 1; + } + + btrfs_release_path(path); + path->search_commit_root = 0; + path->skip_locking = 0; + + return ret; +} + +static int add_conflicting_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + u64 ino, u64 parent, + struct btrfs_log_ctx *ctx) { struct btrfs_ino_list *ino_elem; - LIST_HEAD(inode_list); - int ret = 0; + struct inode *inode; + + /* + * It's rare to have a lot of conflicting inodes, in practice it is not + * common to have more than 1 or 2. We don't want to collect too many, + * as we could end up logging too many inodes (even if only in + * LOG_INODE_EXISTS mode) and slow down other fsyncs or transaction + * commits. + */ + if (ctx->num_conflict_inodes >= MAX_CONFLICT_INODES) + return BTRFS_LOG_FORCE_COMMIT; + + inode = btrfs_iget(root->fs_info->sb, ino, root); + /* + * If the other inode that had a conflicting dir entry was deleted in + * the current transaction then we either: + * + * 1) Log the parent directory (later after adding it to the list) if + * the inode is a directory. This is because it may be a deleted + * subvolume/snapshot or it may be a regular directory that had + * deleted subvolumes/snapshots (or subdirectories that had them), + * and at the moment we can't deal with dropping subvolumes/snapshots + * during log replay. So we just log the parent, which will result in + * a fallback to a transaction commit if we are dealing with those + * cases (last_unlink_trans will match the current transaction); + * + * 2) Do nothing if it's not a directory. During log replay we simply + * unlink the conflicting dentry from the parent directory and then + * add the dentry for our inode. Like this we can avoid logging the + * parent directory (and maybe fallback to a transaction commit in + * case it has a last_unlink_trans == trans->transid, due to moving + * some inode from it to some other directory). + */ + if (IS_ERR(inode)) { + int ret = PTR_ERR(inode); + + if (ret != -ENOENT) + return ret; + + ret = conflicting_inode_is_dir(root, ino, path); + /* Not a directory or we got an error. */ + if (ret <= 0) + return ret; + + /* Conflicting inode is a directory, so we'll log its parent. */ + ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS); + if (!ino_elem) + return -ENOMEM; + ino_elem->ino = ino; + ino_elem->parent = parent; + list_add_tail(&ino_elem->list, &ctx->conflict_inodes); + ctx->num_conflict_inodes++; + + return 0; + } + + /* + * If the inode was already logged skip it - otherwise we can hit an + * infinite loop. Example: + * + * From the commit root (previous transaction) we have the following + * inodes: + * + * inode 257 a directory + * inode 258 with references "zz" and "zz_link" on inode 257 + * inode 259 with reference "a" on inode 257 + * + * And in the current (uncommitted) transaction we have: + * + * inode 257 a directory, unchanged + * inode 258 with references "a" and "a2" on inode 257 + * inode 259 with reference "zz_link" on inode 257 + * inode 261 with reference "zz" on inode 257 + * + * When logging inode 261 the following infinite loop could + * happen if we don't skip already logged inodes: + * + * - we detect inode 258 as a conflicting inode, with inode 261 + * on reference "zz", and log it; + * + * - we detect inode 259 as a conflicting inode, with inode 258 + * on reference "a", and log it; + * + * - we detect inode 258 as a conflicting inode, with inode 259 + * on reference "zz_link", and log it - again! After this we + * repeat the above steps forever. + * + * Here we can use need_log_inode() because we only need to log the + * inode in LOG_INODE_EXISTS mode and rename operations update the log, + * so that the log ends up with the new name and without the old name. + */ + if (!need_log_inode(trans, BTRFS_I(inode))) { + btrfs_add_delayed_iput(inode); + return 0; + } + + btrfs_add_delayed_iput(inode); ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS); if (!ino_elem) return -ENOMEM; ino_elem->ino = ino; ino_elem->parent = parent; - list_add_tail(&ino_elem->list, &inode_list); + list_add_tail(&ino_elem->list, &ctx->conflict_inodes); + ctx->num_conflict_inodes++; - while (!list_empty(&inode_list)) { - struct btrfs_fs_info *fs_info = root->fs_info; - struct btrfs_key key; - struct inode *inode; + return 0; +} - ino_elem = list_first_entry(&inode_list, struct btrfs_ino_list, - list); - ino = ino_elem->ino; - parent = ino_elem->parent; - list_del(&ino_elem->list); - kfree(ino_elem); - if (ret) - continue; +static int log_conflicting_inodes(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_log_ctx *ctx) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + int ret = 0; - btrfs_release_path(path); + /* + * Conflicting inodes are logged by the first call to btrfs_log_inode(), + * otherwise we could have unbounded recursion of btrfs_log_inode() + * calls. This check guarantees we can have only 1 level of recursion. + */ + if (ctx->logging_conflict_inodes) + return 0; - key.objectid = ino; - key.type = BTRFS_INODE_ITEM_KEY; - key.offset = 0; - inode = btrfs_iget(fs_info->sb, &key, root); + ctx->logging_conflict_inodes = true; + + /* + * New conflicting inodes may be found and added to the list while we + * are logging a conflicting inode, so keep iterating while the list is + * not empty. + */ + while (!list_empty(&ctx->conflict_inodes)) { + struct btrfs_ino_list *curr; + struct inode *inode; + u64 ino; + u64 parent; + + curr = list_first_entry(&ctx->conflict_inodes, + struct btrfs_ino_list, list); + ino = curr->ino; + parent = curr->parent; + list_del(&curr->list); + kfree(curr); + + inode = btrfs_iget(fs_info->sb, ino, root); /* * If the other inode that had a conflicting dir entry was * deleted in the current transaction, we need to log its parent - * directory. + * directory. See the comment at add_conflicting_inode(). */ if (IS_ERR(inode)) { ret = PTR_ERR(inode); - if (ret == -ENOENT) { - key.objectid = parent; - inode = btrfs_iget(fs_info->sb, &key, root); - if (IS_ERR(inode)) { - ret = PTR_ERR(inode); - } else { - ret = btrfs_log_inode(trans, root, - BTRFS_I(inode), - LOG_OTHER_INODE_ALL, - 0, LLONG_MAX, ctx); - btrfs_add_delayed_iput(inode); - } + if (ret != -ENOENT) + break; + + inode = btrfs_iget(fs_info->sb, parent, root); + if (IS_ERR(inode)) { + ret = PTR_ERR(inode); + break; } + + /* + * Always log the directory, we cannot make this + * conditional on need_log_inode() because the directory + * might have been logged in LOG_INODE_EXISTS mode or + * the dir index of the conflicting inode is not in a + * dir index key range logged for the directory. So we + * must make sure the deletion is recorded. + */ + ret = btrfs_log_inode(trans, BTRFS_I(inode), + LOG_INODE_ALL, ctx); + btrfs_add_delayed_iput(inode); + if (ret) + break; continue; } + /* - * If the inode was already logged skip it - otherwise we can - * hit an infinite loop. Example: - * - * From the commit root (previous transaction) we have the - * following inodes: - * - * inode 257 a directory - * inode 258 with references "zz" and "zz_link" on inode 257 - * inode 259 with reference "a" on inode 257 - * - * And in the current (uncommitted) transaction we have: - * - * inode 257 a directory, unchanged - * inode 258 with references "a" and "a2" on inode 257 - * inode 259 with reference "zz_link" on inode 257 - * inode 261 with reference "zz" on inode 257 - * - * When logging inode 261 the following infinite loop could - * happen if we don't skip already logged inodes: + * Here we can use need_log_inode() because we only need to log + * the inode in LOG_INODE_EXISTS mode and rename operations + * update the log, so that the log ends up with the new name and + * without the old name. * - * - we detect inode 258 as a conflicting inode, with inode 261 - * on reference "zz", and log it; - * - * - we detect inode 259 as a conflicting inode, with inode 258 - * on reference "a", and log it; - * - * - we detect inode 258 as a conflicting inode, with inode 259 - * on reference "zz_link", and log it - again! After this we - * repeat the above steps forever. - */ - spin_lock(&BTRFS_I(inode)->lock); - /* - * Check the inode's logged_trans only instead of - * btrfs_inode_in_log(). This is because the last_log_commit of - * the inode is not updated when we only log that it exists and - * and it has the full sync bit set (see btrfs_log_inode()). + * We did this check at add_conflicting_inode(), but here we do + * it again because if some other task logged the inode after + * that, we can avoid doing it again. */ - if (BTRFS_I(inode)->logged_trans == trans->transid) { - spin_unlock(&BTRFS_I(inode)->lock); + if (!need_log_inode(trans, BTRFS_I(inode))) { btrfs_add_delayed_iput(inode); continue; } - spin_unlock(&BTRFS_I(inode)->lock); + /* * We are safe logging the other inode without acquiring its * lock as long as we log with the LOG_INODE_EXISTS mode. We @@ -4873,68 +5747,539 @@ static int log_conflicting_inodes(struct btrfs_trans_handle *trans, * well because during a rename we pin the log and update the * log with the new name before we unpin it. */ - ret = btrfs_log_inode(trans, root, BTRFS_I(inode), - LOG_OTHER_INODE, 0, LLONG_MAX, ctx); - if (ret) { - btrfs_add_delayed_iput(inode); - continue; - } + ret = btrfs_log_inode(trans, BTRFS_I(inode), LOG_INODE_EXISTS, ctx); + btrfs_add_delayed_iput(inode); + if (ret) + break; + } - key.objectid = ino; - key.type = BTRFS_INODE_REF_KEY; - key.offset = 0; - ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); - if (ret < 0) { - btrfs_add_delayed_iput(inode); - continue; + ctx->logging_conflict_inodes = false; + if (ret) + free_conflicting_inodes(ctx); + + return ret; +} + +static int copy_inode_items_to_log(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_key *min_key, + const struct btrfs_key *max_key, + struct btrfs_path *path, + struct btrfs_path *dst_path, + const u64 logged_isize, + const int inode_only, + struct btrfs_log_ctx *ctx, + bool *need_log_inode_item) +{ + const u64 i_size = i_size_read(&inode->vfs_inode); + struct btrfs_root *root = inode->root; + int ins_start_slot = 0; + int ins_nr = 0; + int ret; + + while (1) { + ret = btrfs_search_forward(root, min_key, path, trans->transid); + if (ret < 0) + return ret; + if (ret > 0) { + ret = 0; + break; } +again: + /* Note, ins_nr might be > 0 here, cleanup outside the loop */ + if (min_key->objectid != max_key->objectid) + break; + if (min_key->type > max_key->type) + break; - while (true) { - struct extent_buffer *leaf = path->nodes[0]; - int slot = path->slots[0]; + if (min_key->type == BTRFS_INODE_ITEM_KEY) { + *need_log_inode_item = false; + } else if (min_key->type == BTRFS_EXTENT_DATA_KEY && + min_key->offset >= i_size) { + /* + * Extents at and beyond eof are logged with + * btrfs_log_prealloc_extents(). + * Only regular files have BTRFS_EXTENT_DATA_KEY keys, + * and no keys greater than that, so bail out. + */ + break; + } else if ((min_key->type == BTRFS_INODE_REF_KEY || + min_key->type == BTRFS_INODE_EXTREF_KEY) && + (inode->generation == trans->transid || + ctx->logging_conflict_inodes)) { u64 other_ino = 0; u64 other_parent = 0; - if (slot >= btrfs_header_nritems(leaf)) { - ret = btrfs_next_leaf(root, path); - if (ret < 0) { - break; - } else if (ret > 0) { - ret = 0; - break; + ret = btrfs_check_ref_name_override(path->nodes[0], + path->slots[0], min_key, inode, + &other_ino, &other_parent); + if (ret < 0) { + return ret; + } else if (ret > 0 && + other_ino != btrfs_ino(BTRFS_I(ctx->inode))) { + if (ins_nr > 0) { + ins_nr++; + } else { + ins_nr = 1; + ins_start_slot = path->slots[0]; } - continue; - } + ret = copy_items(trans, inode, dst_path, path, + ins_start_slot, ins_nr, + inode_only, logged_isize); + if (ret < 0) + return ret; + ins_nr = 0; - btrfs_item_key_to_cpu(leaf, &key, slot); - if (key.objectid != ino || - (key.type != BTRFS_INODE_REF_KEY && - key.type != BTRFS_INODE_EXTREF_KEY)) { - ret = 0; - break; + btrfs_release_path(path); + ret = add_conflicting_inode(trans, root, path, + other_ino, + other_parent, ctx); + if (ret) + return ret; + goto next_key; } + } else if (min_key->type == BTRFS_XATTR_ITEM_KEY) { + /* Skip xattrs, logged later with btrfs_log_all_xattrs() */ + if (ins_nr == 0) + goto next_slot; + ret = copy_items(trans, inode, dst_path, path, + ins_start_slot, + ins_nr, inode_only, logged_isize); + if (ret < 0) + return ret; + ins_nr = 0; + goto next_slot; + } + + if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { + ins_nr++; + goto next_slot; + } else if (!ins_nr) { + ins_start_slot = path->slots[0]; + ins_nr = 1; + goto next_slot; + } - ret = btrfs_check_ref_name_override(leaf, slot, &key, - BTRFS_I(inode), &other_ino, - &other_parent); + ret = copy_items(trans, inode, dst_path, path, ins_start_slot, + ins_nr, inode_only, logged_isize); + if (ret < 0) + return ret; + ins_nr = 1; + ins_start_slot = path->slots[0]; +next_slot: + path->slots[0]++; + if (path->slots[0] < btrfs_header_nritems(path->nodes[0])) { + btrfs_item_key_to_cpu(path->nodes[0], min_key, + path->slots[0]); + goto again; + } + if (ins_nr) { + ret = copy_items(trans, inode, dst_path, path, + ins_start_slot, ins_nr, inode_only, + logged_isize); if (ret < 0) + return ret; + ins_nr = 0; + } + btrfs_release_path(path); +next_key: + if (min_key->offset < (u64)-1) { + min_key->offset++; + } else if (min_key->type < max_key->type) { + min_key->type++; + min_key->offset = 0; + } else { + break; + } + + /* + * We may process many leaves full of items for our inode, so + * avoid monopolizing a cpu for too long by rescheduling while + * not holding locks on any tree. + */ + cond_resched(); + } + if (ins_nr) { + ret = copy_items(trans, inode, dst_path, path, ins_start_slot, + ins_nr, inode_only, logged_isize); + if (ret) + return ret; + } + + if (inode_only == LOG_INODE_ALL && S_ISREG(inode->vfs_inode.i_mode)) { + /* + * Release the path because otherwise we might attempt to double + * lock the same leaf with btrfs_log_prealloc_extents() below. + */ + btrfs_release_path(path); + ret = btrfs_log_prealloc_extents(trans, inode, dst_path); + } + + return ret; +} + +static int insert_delayed_items_batch(struct btrfs_trans_handle *trans, + struct btrfs_root *log, + struct btrfs_path *path, + const struct btrfs_item_batch *batch, + const struct btrfs_delayed_item *first_item) +{ + const struct btrfs_delayed_item *curr = first_item; + int ret; + + ret = btrfs_insert_empty_items(trans, log, path, batch); + if (ret) + return ret; + + for (int i = 0; i < batch->nr; i++) { + char *data_ptr; + + data_ptr = btrfs_item_ptr(path->nodes[0], path->slots[0], char); + write_extent_buffer(path->nodes[0], &curr->data, + (unsigned long)data_ptr, curr->data_len); + curr = list_next_entry(curr, log_list); + path->slots[0]++; + } + + btrfs_release_path(path); + + return 0; +} + +static int log_delayed_insertion_items(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path, + const struct list_head *delayed_ins_list, + struct btrfs_log_ctx *ctx) +{ + /* 195 (4095 bytes of keys and sizes) fits in a single 4K page. */ + const int max_batch_size = 195; + const int leaf_data_size = BTRFS_LEAF_DATA_SIZE(trans->fs_info); + const u64 ino = btrfs_ino(inode); + struct btrfs_root *log = inode->root->log_root; + struct btrfs_item_batch batch = { + .nr = 0, + .total_data_size = 0, + }; + const struct btrfs_delayed_item *first = NULL; + const struct btrfs_delayed_item *curr; + char *ins_data; + struct btrfs_key *ins_keys; + u32 *ins_sizes; + u64 curr_batch_size = 0; + int batch_idx = 0; + int ret; + + /* We are adding dir index items to the log tree. */ + lockdep_assert_held(&inode->log_mutex); + + /* + * We collect delayed items before copying index keys from the subvolume + * to the log tree. However just after we collected them, they may have + * been flushed (all of them or just some of them), and therefore we + * could have copied them from the subvolume tree to the log tree. + * So find the first delayed item that was not yet logged (they are + * sorted by index number). + */ + list_for_each_entry(curr, delayed_ins_list, log_list) { + if (curr->index > inode->last_dir_index_offset) { + first = curr; + break; + } + } + + /* Empty list or all delayed items were already logged. */ + if (!first) + return 0; + + ins_data = kmalloc(max_batch_size * sizeof(u32) + + max_batch_size * sizeof(struct btrfs_key), GFP_NOFS); + if (!ins_data) + return -ENOMEM; + ins_sizes = (u32 *)ins_data; + batch.data_sizes = ins_sizes; + ins_keys = (struct btrfs_key *)(ins_data + max_batch_size * sizeof(u32)); + batch.keys = ins_keys; + + curr = first; + while (!list_entry_is_head(curr, delayed_ins_list, log_list)) { + const u32 curr_size = curr->data_len + sizeof(struct btrfs_item); + + if (curr_batch_size + curr_size > leaf_data_size || + batch.nr == max_batch_size) { + ret = insert_delayed_items_batch(trans, log, path, + &batch, first); + if (ret) + goto out; + batch_idx = 0; + batch.nr = 0; + batch.total_data_size = 0; + curr_batch_size = 0; + first = curr; + } + + ins_sizes[batch_idx] = curr->data_len; + ins_keys[batch_idx].objectid = ino; + ins_keys[batch_idx].type = BTRFS_DIR_INDEX_KEY; + ins_keys[batch_idx].offset = curr->index; + curr_batch_size += curr_size; + batch.total_data_size += curr->data_len; + batch.nr++; + batch_idx++; + curr = list_next_entry(curr, log_list); + } + + ASSERT(batch.nr >= 1); + ret = insert_delayed_items_batch(trans, log, path, &batch, first); + + curr = list_last_entry(delayed_ins_list, struct btrfs_delayed_item, + log_list); + inode->last_dir_index_offset = curr->index; +out: + kfree(ins_data); + + return ret; +} + +static int log_delayed_deletions_full(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path, + const struct list_head *delayed_del_list, + struct btrfs_log_ctx *ctx) +{ + const u64 ino = btrfs_ino(inode); + const struct btrfs_delayed_item *curr; + + curr = list_first_entry(delayed_del_list, struct btrfs_delayed_item, + log_list); + + while (!list_entry_is_head(curr, delayed_del_list, log_list)) { + u64 first_dir_index = curr->index; + u64 last_dir_index; + const struct btrfs_delayed_item *next; + int ret; + + /* + * Find a range of consecutive dir index items to delete. Like + * this we log a single dir range item spanning several contiguous + * dir items instead of logging one range item per dir index item. + */ + next = list_next_entry(curr, log_list); + while (!list_entry_is_head(next, delayed_del_list, log_list)) { + if (next->index != curr->index + 1) break; - if (ret > 0) { - ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS); - if (!ino_elem) { - ret = -ENOMEM; - break; - } - ino_elem->ino = other_ino; - ino_elem->parent = other_parent; - list_add_tail(&ino_elem->list, &inode_list); - ret = 0; - } - path->slots[0]++; + curr = next; + next = list_next_entry(next, log_list); } - btrfs_add_delayed_iput(inode); + + last_dir_index = curr->index; + ASSERT(last_dir_index >= first_dir_index); + + ret = insert_dir_log_key(trans, inode->root->log_root, path, + ino, first_dir_index, last_dir_index); + if (ret) + return ret; + curr = list_next_entry(curr, log_list); + } + + return 0; +} + +static int batch_delete_dir_index_items(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path, + struct btrfs_log_ctx *ctx, + const struct list_head *delayed_del_list, + const struct btrfs_delayed_item *first, + const struct btrfs_delayed_item **last_ret) +{ + const struct btrfs_delayed_item *next; + struct extent_buffer *leaf = path->nodes[0]; + const int last_slot = btrfs_header_nritems(leaf) - 1; + int slot = path->slots[0] + 1; + const u64 ino = btrfs_ino(inode); + + next = list_next_entry(first, log_list); + + while (slot < last_slot && + !list_entry_is_head(next, delayed_del_list, log_list)) { + struct btrfs_key key; + + btrfs_item_key_to_cpu(leaf, &key, slot); + if (key.objectid != ino || + key.type != BTRFS_DIR_INDEX_KEY || + key.offset != next->index) + break; + + slot++; + *last_ret = next; + next = list_next_entry(next, log_list); + } + + return btrfs_del_items(trans, inode->root->log_root, path, + path->slots[0], slot - path->slots[0]); +} + +static int log_delayed_deletions_incremental(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path, + const struct list_head *delayed_del_list, + struct btrfs_log_ctx *ctx) +{ + struct btrfs_root *log = inode->root->log_root; + const struct btrfs_delayed_item *curr; + u64 last_range_start; + u64 last_range_end = 0; + struct btrfs_key key; + + key.objectid = btrfs_ino(inode); + key.type = BTRFS_DIR_INDEX_KEY; + curr = list_first_entry(delayed_del_list, struct btrfs_delayed_item, + log_list); + + while (!list_entry_is_head(curr, delayed_del_list, log_list)) { + const struct btrfs_delayed_item *last = curr; + u64 first_dir_index = curr->index; + u64 last_dir_index; + bool deleted_items = false; + int ret; + + key.offset = curr->index; + ret = btrfs_search_slot(trans, log, &key, path, -1, 1); + if (ret < 0) { + return ret; + } else if (ret == 0) { + ret = batch_delete_dir_index_items(trans, inode, path, ctx, + delayed_del_list, curr, + &last); + if (ret) + return ret; + deleted_items = true; + } + + btrfs_release_path(path); + + /* + * If we deleted items from the leaf, it means we have a range + * item logging their range, so no need to add one or update an + * existing one. Otherwise we have to log a dir range item. + */ + if (deleted_items) + goto next_batch; + + last_dir_index = last->index; + ASSERT(last_dir_index >= first_dir_index); + /* + * If this range starts right after where the previous one ends, + * then we want to reuse the previous range item and change its + * end offset to the end of this range. This is just to minimize + * leaf space usage, by avoiding adding a new range item. + */ + if (last_range_end != 0 && first_dir_index == last_range_end + 1) + first_dir_index = last_range_start; + + ret = insert_dir_log_key(trans, log, path, key.objectid, + first_dir_index, last_dir_index); + if (ret) + return ret; + + last_range_start = first_dir_index; + last_range_end = last_dir_index; +next_batch: + curr = list_next_entry(last, log_list); + } + + return 0; +} + +static int log_delayed_deletion_items(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + struct btrfs_path *path, + const struct list_head *delayed_del_list, + struct btrfs_log_ctx *ctx) +{ + /* + * We are deleting dir index items from the log tree or adding range + * items to it. + */ + lockdep_assert_held(&inode->log_mutex); + + if (list_empty(delayed_del_list)) + return 0; + + if (ctx->logged_before) + return log_delayed_deletions_incremental(trans, inode, path, + delayed_del_list, ctx); + + return log_delayed_deletions_full(trans, inode, path, delayed_del_list, + ctx); +} + +/* + * Similar logic as for log_new_dir_dentries(), but it iterates over the delayed + * items instead of the subvolume tree. + */ +static int log_new_delayed_dentries(struct btrfs_trans_handle *trans, + struct btrfs_inode *inode, + const struct list_head *delayed_ins_list, + struct btrfs_log_ctx *ctx) +{ + const bool orig_log_new_dentries = ctx->log_new_dentries; + struct btrfs_fs_info *fs_info = trans->fs_info; + struct btrfs_delayed_item *item; + int ret = 0; + + /* + * No need for the log mutex, plus to avoid potential deadlocks or + * lockdep annotations due to nesting of delayed inode mutexes and log + * mutexes. + */ + lockdep_assert_not_held(&inode->log_mutex); + + ASSERT(!ctx->logging_new_delayed_dentries); + ctx->logging_new_delayed_dentries = true; + + list_for_each_entry(item, delayed_ins_list, log_list) { + struct btrfs_dir_item *dir_item; + struct inode *di_inode; + struct btrfs_key key; + int log_mode = LOG_INODE_EXISTS; + + dir_item = (struct btrfs_dir_item *)item->data; + btrfs_disk_key_to_cpu(&key, &dir_item->location); + + if (key.type == BTRFS_ROOT_ITEM_KEY) + continue; + + di_inode = btrfs_iget(fs_info->sb, key.objectid, inode->root); + if (IS_ERR(di_inode)) { + ret = PTR_ERR(di_inode); + break; + } + + if (!need_log_inode(trans, BTRFS_I(di_inode))) { + btrfs_add_delayed_iput(di_inode); + continue; + } + + if (btrfs_stack_dir_type(dir_item) == BTRFS_FT_DIR) + log_mode = LOG_INODE_ALL; + + ctx->log_new_dentries = false; + ret = btrfs_log_inode(trans, BTRFS_I(di_inode), log_mode, ctx); + + if (!ret && ctx->log_new_dentries) + ret = log_new_dir_dentries(trans, BTRFS_I(di_inode), ctx); + + btrfs_add_delayed_iput(di_inode); + + if (ret) + break; } + ctx->log_new_dentries = orig_log_new_dentries; + ctx->logging_new_delayed_dentries = false; + return ret; } @@ -4953,30 +6298,26 @@ static int log_conflicting_inodes(struct btrfs_trans_handle *trans, * This handles both files and directories. */ static int btrfs_log_inode(struct btrfs_trans_handle *trans, - struct btrfs_root *root, struct btrfs_inode *inode, + struct btrfs_inode *inode, int inode_only, - const loff_t start, - const loff_t end, struct btrfs_log_ctx *ctx) { - struct btrfs_fs_info *fs_info = root->fs_info; struct btrfs_path *path; struct btrfs_path *dst_path; struct btrfs_key min_key; struct btrfs_key max_key; - struct btrfs_root *log = root->log_root; - int err = 0; + struct btrfs_root *log = inode->root->log_root; int ret; - int nritems; - int ins_start_slot = 0; - int ins_nr; bool fast_search = false; u64 ino = btrfs_ino(inode); struct extent_map_tree *em_tree = &inode->extent_tree; u64 logged_isize = 0; bool need_log_inode_item = true; bool xattrs_logged = false; - bool recursive_logging = false; + bool inode_item_dropped = true; + bool full_dir_logging = false; + LIST_HEAD(delayed_ins_list); + LIST_HEAD(delayed_del_list); path = btrfs_alloc_path(); if (!path) @@ -5004,33 +6345,81 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, max_key.type = (u8)-1; max_key.offset = (u64)-1; + if (S_ISDIR(inode->vfs_inode.i_mode) && inode_only == LOG_INODE_ALL) + full_dir_logging = true; + /* - * Only run delayed items if we are a dir or a new file. - * Otherwise commit the delayed inode only, which is needed in - * order for the log replay code to mark inodes for link count - * fixup (create temporary BTRFS_TREE_LOG_FIXUP_OBJECTID items). + * If we are logging a directory while we are logging dentries of the + * delayed items of some other inode, then we need to flush the delayed + * items of this directory and not log the delayed items directly. This + * is to prevent more than one level of recursion into btrfs_log_inode() + * by having something like this: + * + * $ mkdir -p a/b/c/d/e/f/g/h/... + * $ xfs_io -c "fsync" a + * + * Where all directories in the path did not exist before and are + * created in the current transaction. + * So in such a case we directly log the delayed items of the main + * directory ("a") without flushing them first, while for each of its + * subdirectories we flush their delayed items before logging them. + * This prevents a potential unbounded recursion like this: + * + * btrfs_log_inode() + * log_new_delayed_dentries() + * btrfs_log_inode() + * log_new_delayed_dentries() + * btrfs_log_inode() + * log_new_delayed_dentries() + * (...) + * + * We have thresholds for the maximum number of delayed items to have in + * memory, and once they are hit, the items are flushed asynchronously. + * However the limit is quite high, so lets prevent deep levels of + * recursion to happen by limiting the maximum depth to be 1. */ - if (S_ISDIR(inode->vfs_inode.i_mode) || - inode->generation > fs_info->last_trans_committed) + if (full_dir_logging && ctx->logging_new_delayed_dentries) { ret = btrfs_commit_inode_delayed_items(trans, inode); - else - ret = btrfs_commit_inode_delayed_inode(inode); - - if (ret) { - btrfs_free_path(path); - btrfs_free_path(dst_path); - return ret; + if (ret) + goto out; } - if (inode_only == LOG_OTHER_INODE || inode_only == LOG_OTHER_INODE_ALL) { - recursive_logging = true; - if (inode_only == LOG_OTHER_INODE) - inode_only = LOG_INODE_EXISTS; - else - inode_only = LOG_INODE_ALL; - mutex_lock_nested(&inode->log_mutex, SINGLE_DEPTH_NESTING); - } else { - mutex_lock(&inode->log_mutex); + mutex_lock(&inode->log_mutex); + + /* + * For symlinks, we must always log their content, which is stored in an + * inline extent, otherwise we could end up with an empty symlink after + * log replay, which is invalid on linux (symlink(2) returns -ENOENT if + * one attempts to create an empty symlink). + * We don't need to worry about flushing delalloc, because when we create + * the inline extent when the symlink is created (we never have delalloc + * for symlinks). + */ + if (S_ISLNK(inode->vfs_inode.i_mode)) + inode_only = LOG_INODE_ALL; + + /* + * Before logging the inode item, cache the value returned by + * inode_logged(), because after that we have the need to figure out if + * the inode was previously logged in this transaction. + */ + ret = inode_logged(trans, inode, path); + if (ret < 0) + goto out_unlock; + ctx->logged_before = (ret == 1); + ret = 0; + + /* + * This is for cases where logging a directory could result in losing a + * a file after replaying the log. For example, if we move a file from a + * directory A to a directory B, then fsync directory A, we have no way + * to known the file was moved from A to B, so logging just A would + * result in losing the file after a log replay. + */ + if (full_dir_logging && inode->last_unlink_trans >= trans->transid) { + btrfs_set_log_full_commit(trans); + ret = BTRFS_LOG_FORCE_COMMIT; + goto out_unlock; } /* @@ -5038,13 +6427,12 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, * copies of everything. */ if (S_ISDIR(inode->vfs_inode.i_mode)) { - int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; - - if (inode_only == LOG_INODE_EXISTS) - max_key_type = BTRFS_XATTR_ITEM_KEY; - ret = drop_objectid_items(trans, log, path, ino, max_key_type); + clear_bit(BTRFS_INODE_COPY_EVERYTHING, &inode->runtime_flags); + if (ctx->logged_before) + ret = drop_inode_items(trans, log, path, inode, + BTRFS_XATTR_ITEM_KEY); } else { - if (inode_only == LOG_INODE_EXISTS) { + if (inode_only == LOG_INODE_EXISTS && ctx->logged_before) { /* * Make sure the new inode item we write to the log has * the same isize as the current one (if it exists). @@ -5058,27 +6446,25 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, * (zeroes), as if an expanding truncate happened, * instead of getting a file of 4Kb only. */ - err = logged_inode_size(log, inode, path, &logged_isize); - if (err) + ret = logged_inode_size(log, inode, path, &logged_isize); + if (ret) goto out_unlock; } if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags)) { if (inode_only == LOG_INODE_EXISTS) { max_key.type = BTRFS_XATTR_ITEM_KEY; - ret = drop_objectid_items(trans, log, path, ino, - max_key.type); + if (ctx->logged_before) + ret = drop_inode_items(trans, log, path, + inode, max_key.type); } else { clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); clear_bit(BTRFS_INODE_COPY_EVERYTHING, &inode->runtime_flags); - while(1) { - ret = btrfs_truncate_inode_items(trans, - log, &inode->vfs_inode, 0, 0); - if (ret != -EAGAIN) - break; - } + if (ctx->logged_before) + ret = truncate_inode_items(trans, log, + inode, 0, 0); } } else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING, &inode->runtime_flags) || @@ -5086,520 +6472,163 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans, if (inode_only == LOG_INODE_ALL) fast_search = true; max_key.type = BTRFS_XATTR_ITEM_KEY; - ret = drop_objectid_items(trans, log, path, ino, - max_key.type); + if (ctx->logged_before) + ret = drop_inode_items(trans, log, path, inode, + max_key.type); } else { if (inode_only == LOG_INODE_ALL) fast_search = true; + inode_item_dropped = false; goto log_extents; } } - if (ret) { - err = ret; + if (ret) goto out_unlock; - } - while (1) { - ins_nr = 0; - ret = btrfs_search_forward(root, &min_key, - path, trans->transid); - if (ret < 0) { - err = ret; - goto out_unlock; - } - if (ret != 0) - break; -again: - /* note, ins_nr might be > 0 here, cleanup outside the loop */ - if (min_key.objectid != ino) - break; - if (min_key.type > max_key.type) - break; - - if (min_key.type == BTRFS_INODE_ITEM_KEY) - need_log_inode_item = false; - - if ((min_key.type == BTRFS_INODE_REF_KEY || - min_key.type == BTRFS_INODE_EXTREF_KEY) && - inode->generation == trans->transid && - !recursive_logging) { - u64 other_ino = 0; - u64 other_parent = 0; - - ret = btrfs_check_ref_name_override(path->nodes[0], - path->slots[0], &min_key, inode, - &other_ino, &other_parent); - if (ret < 0) { - err = ret; - goto out_unlock; - } else if (ret > 0 && ctx && - other_ino != btrfs_ino(BTRFS_I(ctx->inode))) { - if (ins_nr > 0) { - ins_nr++; - } else { - ins_nr = 1; - ins_start_slot = path->slots[0]; - } - ret = copy_items(trans, inode, dst_path, path, - ins_start_slot, - ins_nr, inode_only, - logged_isize); - if (ret < 0) { - err = ret; - goto out_unlock; - } - ins_nr = 0; - - err = log_conflicting_inodes(trans, root, path, - ctx, other_ino, other_parent); - if (err) - goto out_unlock; - btrfs_release_path(path); - goto next_key; - } - } - - /* Skip xattrs, we log them later with btrfs_log_all_xattrs() */ - if (min_key.type == BTRFS_XATTR_ITEM_KEY) { - if (ins_nr == 0) - goto next_slot; - ret = copy_items(trans, inode, dst_path, path, - ins_start_slot, - ins_nr, inode_only, logged_isize); - if (ret < 0) { - err = ret; - goto out_unlock; - } - ins_nr = 0; - goto next_slot; - } - - if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { - ins_nr++; - goto next_slot; - } else if (!ins_nr) { - ins_start_slot = path->slots[0]; - ins_nr = 1; - goto next_slot; - } - - ret = copy_items(trans, inode, dst_path, path, - ins_start_slot, ins_nr, inode_only, - logged_isize); - if (ret < 0) { - err = ret; - goto out_unlock; - } - ins_nr = 1; - ins_start_slot = path->slots[0]; -next_slot: - - nritems = btrfs_header_nritems(path->nodes[0]); - path->slots[0]++; - if (path->slots[0] < nritems) { - btrfs_item_key_to_cpu(path->nodes[0], &min_key, - path->slots[0]); - goto again; - } - if (ins_nr) { - ret = copy_items(trans, inode, dst_path, path, - ins_start_slot, - ins_nr, inode_only, logged_isize); - if (ret < 0) { - err = ret; - goto out_unlock; - } - ins_nr = 0; - } - btrfs_release_path(path); -next_key: - if (min_key.offset < (u64)-1) { - min_key.offset++; - } else if (min_key.type < max_key.type) { - min_key.type++; - min_key.offset = 0; - } else { - break; - } - } - if (ins_nr) { - ret = copy_items(trans, inode, dst_path, path, - ins_start_slot, ins_nr, inode_only, - logged_isize); - if (ret < 0) { - err = ret; - goto out_unlock; - } - ins_nr = 0; - } + /* + * If we are logging a directory in full mode, collect the delayed items + * before iterating the subvolume tree, so that we don't miss any new + * dir index items in case they get flushed while or right after we are + * iterating the subvolume tree. + */ + if (full_dir_logging && !ctx->logging_new_delayed_dentries) + btrfs_log_get_delayed_items(inode, &delayed_ins_list, + &delayed_del_list); + + ret = copy_inode_items_to_log(trans, inode, &min_key, &max_key, + path, dst_path, logged_isize, + inode_only, ctx, + &need_log_inode_item); + if (ret) + goto out_unlock; btrfs_release_path(path); btrfs_release_path(dst_path); - err = btrfs_log_all_xattrs(trans, root, inode, path, dst_path); - if (err) + ret = btrfs_log_all_xattrs(trans, inode, path, dst_path); + if (ret) goto out_unlock; xattrs_logged = true; if (max_key.type >= BTRFS_EXTENT_DATA_KEY && !fast_search) { btrfs_release_path(path); btrfs_release_path(dst_path); - err = btrfs_log_holes(trans, root, inode, path); - if (err) + ret = btrfs_log_holes(trans, inode, path); + if (ret) goto out_unlock; } log_extents: btrfs_release_path(path); btrfs_release_path(dst_path); if (need_log_inode_item) { - err = log_inode_item(trans, log, dst_path, inode); - if (!err && !xattrs_logged) { - err = btrfs_log_all_xattrs(trans, root, inode, path, - dst_path); + ret = log_inode_item(trans, log, dst_path, inode, inode_item_dropped); + if (ret) + goto out_unlock; + /* + * If we are doing a fast fsync and the inode was logged before + * in this transaction, we don't need to log the xattrs because + * they were logged before. If xattrs were added, changed or + * deleted since the last time we logged the inode, then we have + * already logged them because the inode had the runtime flag + * BTRFS_INODE_COPY_EVERYTHING set. + */ + if (!xattrs_logged && inode->logged_trans < trans->transid) { + ret = btrfs_log_all_xattrs(trans, inode, path, dst_path); + if (ret) + goto out_unlock; btrfs_release_path(path); } - if (err) - goto out_unlock; } if (fast_search) { - ret = btrfs_log_changed_extents(trans, root, inode, dst_path, - ctx, start, end); - if (ret) { - err = ret; + ret = btrfs_log_changed_extents(trans, inode, dst_path, ctx); + if (ret) goto out_unlock; - } } else if (inode_only == LOG_INODE_ALL) { struct extent_map *em, *n; write_lock(&em_tree->lock); - /* - * We can't just remove every em if we're called for a ranged - * fsync - that is, one that doesn't cover the whole possible - * file range (0 to LLONG_MAX). This is because we can have - * em's that fall outside the range we're logging and therefore - * their ordered operations haven't completed yet - * (btrfs_finish_ordered_io() not invoked yet). This means we - * didn't get their respective file extent item in the fs/subvol - * tree yet, and need to let the next fast fsync (one which - * consults the list of modified extent maps) find the em so - * that it logs a matching file extent item and waits for the - * respective ordered operation to complete (if it's still - * running). - * - * Removing every em outside the range we're logging would make - * the next fast fsync not log their matching file extent items, - * therefore making us lose data after a log replay. - */ - list_for_each_entry_safe(em, n, &em_tree->modified_extents, - list) { - const u64 mod_end = em->mod_start + em->mod_len - 1; - - if (em->mod_start >= start && mod_end <= end) - list_del_init(&em->list); - } + list_for_each_entry_safe(em, n, &em_tree->modified_extents, list) + list_del_init(&em->list); write_unlock(&em_tree->lock); } - if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->vfs_inode.i_mode)) { - ret = log_directory_changes(trans, root, inode, path, dst_path, - ctx); - if (ret) { - err = ret; + if (full_dir_logging) { + ret = log_directory_changes(trans, inode, path, dst_path, ctx); + if (ret) + goto out_unlock; + ret = log_delayed_insertion_items(trans, inode, path, + &delayed_ins_list, ctx); + if (ret) + goto out_unlock; + ret = log_delayed_deletion_items(trans, inode, path, + &delayed_del_list, ctx); + if (ret) goto out_unlock; - } } - /* - * Don't update last_log_commit if we logged that an inode exists after - * it was loaded to memory (full_sync bit set). - * This is to prevent data loss when we do a write to the inode, then - * the inode gets evicted after all delalloc was flushed, then we log - * it exists (due to a rename for example) and then fsync it. This last - * fsync would do nothing (not logging the extents previously written). - */ spin_lock(&inode->lock); inode->logged_trans = trans->transid; - if (inode_only != LOG_INODE_EXISTS || - !test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags)) + /* + * Don't update last_log_commit if we logged that an inode exists. + * We do this for three reasons: + * + * 1) We might have had buffered writes to this inode that were + * flushed and had their ordered extents completed in this + * transaction, but we did not previously log the inode with + * LOG_INODE_ALL. Later the inode was evicted and after that + * it was loaded again and this LOG_INODE_EXISTS log operation + * happened. We must make sure that if an explicit fsync against + * the inode is performed later, it logs the new extents, an + * updated inode item, etc, and syncs the log. The same logic + * applies to direct IO writes instead of buffered writes. + * + * 2) When we log the inode with LOG_INODE_EXISTS, its inode item + * is logged with an i_size of 0 or whatever value was logged + * before. If later the i_size of the inode is increased by a + * truncate operation, the log is synced through an fsync of + * some other inode and then finally an explicit fsync against + * this inode is made, we must make sure this fsync logs the + * inode with the new i_size, the hole between old i_size and + * the new i_size, and syncs the log. + * + * 3) If we are logging that an ancestor inode exists as part of + * logging a new name from a link or rename operation, don't update + * its last_log_commit - otherwise if an explicit fsync is made + * against an ancestor, the fsync considers the inode in the log + * and doesn't sync the log, resulting in the ancestor missing after + * a power failure unless the log was synced as part of an fsync + * against any other unrelated inode. + */ + if (inode_only != LOG_INODE_EXISTS) inode->last_log_commit = inode->last_sub_trans; spin_unlock(&inode->lock); -out_unlock: - mutex_unlock(&inode->log_mutex); - - btrfs_free_path(path); - btrfs_free_path(dst_path); - return err; -} - -/* - * Check if we must fallback to a transaction commit when logging an inode. - * This must be called after logging the inode and is used only in the context - * when fsyncing an inode requires the need to log some other inode - in which - * case we can't lock the i_mutex of each other inode we need to log as that - * can lead to deadlocks with concurrent fsync against other inodes (as we can - * log inodes up or down in the hierarchy) or rename operations for example. So - * we take the log_mutex of the inode after we have logged it and then check for - * its last_unlink_trans value - this is safe because any task setting - * last_unlink_trans must take the log_mutex and it must do this before it does - * the actual unlink operation, so if we do this check before a concurrent task - * sets last_unlink_trans it means we've logged a consistent version/state of - * all the inode items, otherwise we are not sure and must do a transaction - * commit (the concurrent task might have only updated last_unlink_trans before - * we logged the inode or it might have also done the unlink). - */ -static bool btrfs_must_commit_transaction(struct btrfs_trans_handle *trans, - struct btrfs_inode *inode) -{ - struct btrfs_fs_info *fs_info = inode->root->fs_info; - bool ret = false; - - mutex_lock(&inode->log_mutex); - if (inode->last_unlink_trans > fs_info->last_trans_committed) { - /* - * Make sure any commits to the log are forced to be full - * commits. - */ - btrfs_set_log_full_commit(trans); - ret = true; - } - mutex_unlock(&inode->log_mutex); - - return ret; -} - -/* - * follow the dentry parent pointers up the chain and see if any - * of the directories in it require a full commit before they can - * be logged. Returns zero if nothing special needs to be done or 1 if - * a full commit is required. - */ -static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, - struct btrfs_inode *inode, - struct dentry *parent, - struct super_block *sb, - u64 last_committed) -{ - int ret = 0; - struct dentry *old_parent = NULL; /* - * for regular files, if its inode is already on disk, we don't - * have to worry about the parents at all. This is because - * we can use the last_unlink_trans field to record renames - * and other fun in this file. + * Reset the last_reflink_trans so that the next fsync does not need to + * go through the slower path when logging extents and their checksums. */ - if (S_ISREG(inode->vfs_inode.i_mode) && - inode->generation <= last_committed && - inode->last_unlink_trans <= last_committed) - goto out; - - if (!S_ISDIR(inode->vfs_inode.i_mode)) { - if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) - goto out; - inode = BTRFS_I(d_inode(parent)); - } - - while (1) { - if (btrfs_must_commit_transaction(trans, inode)) { - ret = 1; - break; - } - - if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) - break; + if (inode_only == LOG_INODE_ALL) + inode->last_reflink_trans = 0; - if (IS_ROOT(parent)) { - inode = BTRFS_I(d_inode(parent)); - if (btrfs_must_commit_transaction(trans, inode)) - ret = 1; - break; - } - - parent = dget_parent(parent); - dput(old_parent); - old_parent = parent; - inode = BTRFS_I(d_inode(parent)); - - } - dput(old_parent); +out_unlock: + mutex_unlock(&inode->log_mutex); out: - return ret; -} - -struct btrfs_dir_list { - u64 ino; - struct list_head list; -}; - -/* - * Log the inodes of the new dentries of a directory. See log_dir_items() for - * details about the why it is needed. - * This is a recursive operation - if an existing dentry corresponds to a - * directory, that directory's new entries are logged too (same behaviour as - * ext3/4, xfs, f2fs, reiserfs, nilfs2). Note that when logging the inodes - * the dentries point to we do not lock their i_mutex, otherwise lockdep - * complains about the following circular lock dependency / possible deadlock: - * - * CPU0 CPU1 - * ---- ---- - * lock(&type->i_mutex_dir_key#3/2); - * lock(sb_internal#2); - * lock(&type->i_mutex_dir_key#3/2); - * lock(&sb->s_type->i_mutex_key#14); - * - * Where sb_internal is the lock (a counter that works as a lock) acquired by - * sb_start_intwrite() in btrfs_start_transaction(). - * Not locking i_mutex of the inodes is still safe because: - * - * 1) For regular files we log with a mode of LOG_INODE_EXISTS. It's possible - * that while logging the inode new references (names) are added or removed - * from the inode, leaving the logged inode item with a link count that does - * not match the number of logged inode reference items. This is fine because - * at log replay time we compute the real number of links and correct the - * link count in the inode item (see replay_one_buffer() and - * link_to_fixup_dir()); - * - * 2) For directories we log with a mode of LOG_INODE_ALL. It's possible that - * while logging the inode's items new items with keys BTRFS_DIR_ITEM_KEY and - * BTRFS_DIR_INDEX_KEY are added to fs/subvol tree and the logged inode item - * has a size that doesn't match the sum of the lengths of all the logged - * names. This does not result in a problem because if a dir_item key is - * logged but its matching dir_index key is not logged, at log replay time we - * don't use it to replay the respective name (see replay_one_name()). On the - * other hand if only the dir_index key ends up being logged, the respective - * name is added to the fs/subvol tree with both the dir_item and dir_index - * keys created (see replay_one_name()). - * The directory's inode item with a wrong i_size is not a problem as well, - * since we don't use it at log replay time to set the i_size in the inode - * item of the fs/subvol tree (see overwrite_item()). - */ -static int log_new_dir_dentries(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_inode *start_inode, - struct btrfs_log_ctx *ctx) -{ - struct btrfs_fs_info *fs_info = root->fs_info; - struct btrfs_root *log = root->log_root; - struct btrfs_path *path; - LIST_HEAD(dir_list); - struct btrfs_dir_list *dir_elem; - int ret = 0; - - path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; - - dir_elem = kmalloc(sizeof(*dir_elem), GFP_NOFS); - if (!dir_elem) { - btrfs_free_path(path); - return -ENOMEM; - } - dir_elem->ino = btrfs_ino(start_inode); - list_add_tail(&dir_elem->list, &dir_list); - - while (!list_empty(&dir_list)) { - struct extent_buffer *leaf; - struct btrfs_key min_key; - int nritems; - int i; - - dir_elem = list_first_entry(&dir_list, struct btrfs_dir_list, - list); - if (ret) - goto next_dir_inode; - - min_key.objectid = dir_elem->ino; - min_key.type = BTRFS_DIR_ITEM_KEY; - min_key.offset = 0; -again: - btrfs_release_path(path); - ret = btrfs_search_forward(log, &min_key, path, trans->transid); - if (ret < 0) { - goto next_dir_inode; - } else if (ret > 0) { - ret = 0; - goto next_dir_inode; - } - -process_leaf: - leaf = path->nodes[0]; - nritems = btrfs_header_nritems(leaf); - for (i = path->slots[0]; i < nritems; i++) { - struct btrfs_dir_item *di; - struct btrfs_key di_key; - struct inode *di_inode; - struct btrfs_dir_list *new_dir_elem; - int log_mode = LOG_INODE_EXISTS; - int type; - - btrfs_item_key_to_cpu(leaf, &min_key, i); - if (min_key.objectid != dir_elem->ino || - min_key.type != BTRFS_DIR_ITEM_KEY) - goto next_dir_inode; - - di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item); - type = btrfs_dir_type(leaf, di); - if (btrfs_dir_transid(leaf, di) < trans->transid && - type != BTRFS_FT_DIR) - continue; - btrfs_dir_item_key_to_cpu(leaf, di, &di_key); - if (di_key.type == BTRFS_ROOT_ITEM_KEY) - continue; + btrfs_free_path(path); + btrfs_free_path(dst_path); - btrfs_release_path(path); - di_inode = btrfs_iget(fs_info->sb, &di_key, root); - if (IS_ERR(di_inode)) { - ret = PTR_ERR(di_inode); - goto next_dir_inode; - } + if (ret) + free_conflicting_inodes(ctx); + else + ret = log_conflicting_inodes(trans, inode->root, ctx); - if (btrfs_inode_in_log(BTRFS_I(di_inode), trans->transid)) { - btrfs_add_delayed_iput(di_inode); - break; - } + if (full_dir_logging && !ctx->logging_new_delayed_dentries) { + if (!ret) + ret = log_new_delayed_dentries(trans, inode, + &delayed_ins_list, ctx); - ctx->log_new_dentries = false; - if (type == BTRFS_FT_DIR || type == BTRFS_FT_SYMLINK) - log_mode = LOG_INODE_ALL; - ret = btrfs_log_inode(trans, root, BTRFS_I(di_inode), - log_mode, 0, LLONG_MAX, ctx); - if (!ret && - btrfs_must_commit_transaction(trans, BTRFS_I(di_inode))) - ret = 1; - btrfs_add_delayed_iput(di_inode); - if (ret) - goto next_dir_inode; - if (ctx->log_new_dentries) { - new_dir_elem = kmalloc(sizeof(*new_dir_elem), - GFP_NOFS); - if (!new_dir_elem) { - ret = -ENOMEM; - goto next_dir_inode; - } - new_dir_elem->ino = di_key.objectid; - list_add_tail(&new_dir_elem->list, &dir_list); - } - break; - } - if (i == nritems) { - ret = btrfs_next_leaf(log, path); - if (ret < 0) { - goto next_dir_inode; - } else if (ret > 0) { - ret = 0; - goto next_dir_inode; - } - goto process_leaf; - } - if (min_key.offset < (u64)-1) { - min_key.offset++; - goto again; - } -next_dir_inode: - list_del(&dir_elem->list); - kfree(dir_elem); + btrfs_log_put_delayed_items(inode, &delayed_ins_list, + &delayed_del_list); } - btrfs_free_path(path); return ret; } @@ -5648,7 +6677,7 @@ static int btrfs_log_all_parents(struct btrfs_trans_handle *trans, if (key.objectid != ino || key.type > BTRFS_INODE_EXTREF_KEY) break; - item_size = btrfs_item_size_nr(leaf, slot); + item_size = btrfs_item_size(leaf, slot); ptr = btrfs_item_ptr_offset(leaf, slot); while (cur_offset < item_size) { struct btrfs_key inode_key; @@ -5672,7 +6701,8 @@ static int btrfs_log_all_parents(struct btrfs_trans_handle *trans, cur_offset = item_size; } - dir_inode = btrfs_iget(fs_info->sb, &inode_key, root); + dir_inode = btrfs_iget(fs_info->sb, inode_key.objectid, + root); /* * If the parent inode was deleted, return an error to * fallback to a transaction commit. This is to prevent @@ -5701,15 +6731,16 @@ static int btrfs_log_all_parents(struct btrfs_trans_handle *trans, goto out; } - if (ctx) - ctx->log_new_dentries = false; - ret = btrfs_log_inode(trans, root, BTRFS_I(dir_inode), - LOG_INODE_ALL, 0, LLONG_MAX, ctx); - if (!ret && - btrfs_must_commit_transaction(trans, BTRFS_I(dir_inode))) - ret = 1; - if (!ret && ctx && ctx->log_new_dentries) - ret = log_new_dir_dentries(trans, root, + if (!need_log_inode(trans, BTRFS_I(dir_inode))) { + btrfs_add_delayed_iput(dir_inode); + continue; + } + + ctx->log_new_dentries = false; + ret = btrfs_log_inode(trans, BTRFS_I(dir_inode), + LOG_INODE_ALL, ctx); + if (!ret && ctx->log_new_dentries) + ret = log_new_dir_dentries(trans, BTRFS_I(dir_inode), ctx); btrfs_add_delayed_iput(dir_inode); if (ret) @@ -5734,26 +6765,28 @@ static int log_new_ancestors(struct btrfs_trans_handle *trans, while (true) { struct btrfs_fs_info *fs_info = root->fs_info; - const u64 last_committed = fs_info->last_trans_committed; struct extent_buffer *leaf = path->nodes[0]; int slot = path->slots[0]; struct btrfs_key search_key; struct inode *inode; + u64 ino; int ret = 0; btrfs_release_path(path); + ino = found_key.offset; + search_key.objectid = found_key.offset; search_key.type = BTRFS_INODE_ITEM_KEY; search_key.offset = 0; - inode = btrfs_iget(fs_info->sb, &search_key, root); + inode = btrfs_iget(fs_info->sb, ino, root); if (IS_ERR(inode)) return PTR_ERR(inode); - if (BTRFS_I(inode)->generation > last_committed) - ret = btrfs_log_inode(trans, root, BTRFS_I(inode), - LOG_INODE_EXISTS, - 0, LLONG_MAX, ctx); + if (BTRFS_I(inode)->generation >= trans->transid && + need_log_inode(trans, BTRFS_I(inode))) + ret = btrfs_log_inode(trans, BTRFS_I(inode), + LOG_INODE_EXISTS, ctx); btrfs_add_delayed_iput(inode); if (ret) return ret; @@ -5792,7 +6825,6 @@ static int log_new_ancestors_fast(struct btrfs_trans_handle *trans, struct btrfs_log_ctx *ctx) { struct btrfs_root *root = inode->root; - struct btrfs_fs_info *fs_info = root->fs_info; struct dentry *old_parent = NULL; struct super_block *sb = inode->vfs_inode.i_sb; int ret = 0; @@ -5806,9 +6838,10 @@ static int log_new_ancestors_fast(struct btrfs_trans_handle *trans, if (root != inode->root) break; - if (inode->generation > fs_info->last_trans_committed) { - ret = btrfs_log_inode(trans, root, inode, - LOG_INODE_EXISTS, 0, LLONG_MAX, ctx); + if (inode->generation >= trans->transid && + need_log_inode(trans, inode)) { + ret = btrfs_log_inode(trans, inode, + LOG_INODE_EXISTS, ctx); if (ret) break; } @@ -5916,51 +6949,31 @@ out: static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, struct btrfs_inode *inode, struct dentry *parent, - const loff_t start, - const loff_t end, int inode_only, struct btrfs_log_ctx *ctx) { struct btrfs_root *root = inode->root; struct btrfs_fs_info *fs_info = root->fs_info; - struct super_block *sb; int ret = 0; - u64 last_committed = fs_info->last_trans_committed; bool log_dentries = false; - sb = inode->vfs_inode.i_sb; - if (btrfs_test_opt(fs_info, NOTREELOG)) { - ret = 1; - goto end_no_trans; - } - - /* - * The prev transaction commit doesn't complete, we need do - * full commit by ourselves. - */ - if (fs_info->last_trans_log_full_commit > - fs_info->last_trans_committed) { - ret = 1; + ret = BTRFS_LOG_FORCE_COMMIT; goto end_no_trans; } if (btrfs_root_refs(&root->root_item) == 0) { - ret = 1; + ret = BTRFS_LOG_FORCE_COMMIT; goto end_no_trans; } - ret = check_parent_dirs_for_sync(trans, inode, parent, sb, - last_committed); - if (ret) - goto end_no_trans; - /* * Skip already logged inodes or inodes corresponding to tmpfiles * (since logging them is pointless, a link count of 0 means they * will never be accessible). */ - if (btrfs_inode_in_log(inode, trans->transid) || + if ((btrfs_inode_in_log(inode, trans->transid) && + list_empty(&ctx->ordered_extents)) || inode->vfs_inode.i_nlink == 0) { ret = BTRFS_NO_LOG_SYNC; goto end_no_trans; @@ -5970,7 +6983,7 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, if (ret) goto end_no_trans; - ret = btrfs_log_inode(trans, root, inode, inode_only, start, end, ctx); + ret = btrfs_log_inode(trans, inode, inode_only, ctx); if (ret) goto end_trans; @@ -5981,13 +6994,13 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, * and other fun in this file. */ if (S_ISREG(inode->vfs_inode.i_mode) && - inode->generation <= last_committed && - inode->last_unlink_trans <= last_committed) { + inode->generation < trans->transid && + inode->last_unlink_trans < trans->transid) { ret = 0; goto end_trans; } - if (S_ISDIR(inode->vfs_inode.i_mode) && ctx && ctx->log_new_dentries) + if (S_ISDIR(inode->vfs_inode.i_mode) && ctx->log_new_dentries) log_dentries = true; /* @@ -6031,7 +7044,7 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, * but the file inode does not have a matching BTRFS_INODE_REF_KEY item * and has a link count of 2. */ - if (inode->last_unlink_trans > last_committed) { + if (inode->last_unlink_trans >= trans->transid) { ret = btrfs_log_all_parents(trans, inode, ctx); if (ret) goto end_trans; @@ -6042,13 +7055,13 @@ static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, goto end_trans; if (log_dentries) - ret = log_new_dir_dentries(trans, root, inode, ctx); + ret = log_new_dir_dentries(trans, inode, ctx); else ret = 0; end_trans: if (ret < 0) { btrfs_set_log_full_commit(trans); - ret = 1; + ret = BTRFS_LOG_FORCE_COMMIT; } if (ret) @@ -6066,15 +7079,13 @@ end_no_trans: */ int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, struct dentry *dentry, - const loff_t start, - const loff_t end, struct btrfs_log_ctx *ctx) { struct dentry *parent = dget_parent(dentry); int ret; ret = btrfs_log_inode_parent(trans, BTRFS_I(d_inode(dentry)), parent, - start, end, LOG_INODE_ALL, ctx); + LOG_INODE_ALL, ctx); dput(parent); return ret; @@ -6091,7 +7102,6 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) struct btrfs_trans_handle *trans; struct btrfs_key key; struct btrfs_key found_key; - struct btrfs_key tmp_key; struct btrfs_root *log; struct btrfs_fs_info *fs_info = log_root_tree->fs_info; struct walk_control wc = { @@ -6116,8 +7126,7 @@ int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) ret = walk_log_tree(trans, log_root_tree, &wc); if (ret) { - btrfs_handle_fs_error(fs_info, ret, - "Failed to pin buffers while recovering log root tree."); + btrfs_abort_transaction(trans, ret); goto error; } @@ -6130,8 +7139,7 @@ again: ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); if (ret < 0) { - btrfs_handle_fs_error(fs_info, ret, - "Couldn't find tree log root."); + btrfs_abort_transaction(trans, ret); goto error; } if (ret > 0) { @@ -6145,19 +7153,15 @@ again: if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) break; - log = btrfs_read_fs_root(log_root_tree, &found_key); + log = btrfs_read_tree_root(log_root_tree, &found_key); if (IS_ERR(log)) { ret = PTR_ERR(log); - btrfs_handle_fs_error(fs_info, ret, - "Couldn't read tree log root."); + btrfs_abort_transaction(trans, ret); goto error; } - tmp_key.objectid = found_key.offset; - tmp_key.type = BTRFS_ROOT_ITEM_KEY; - tmp_key.offset = (u64)-1; - - wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key); + wc.replay_dest = btrfs_get_fs_root(fs_info, found_key.offset, + true); if (IS_ERR(wc.replay_dest)) { ret = PTR_ERR(wc.replay_dest); @@ -6173,27 +7177,30 @@ again: * each subsequent pass. */ if (ret == -ENOENT) - ret = btrfs_pin_extent_for_log_replay(fs_info, + ret = btrfs_pin_extent_for_log_replay(trans, log->node->start, log->node->len); - free_extent_buffer(log->node); - free_extent_buffer(log->commit_root); - kfree(log); + btrfs_put_root(log); if (!ret) goto next; - btrfs_handle_fs_error(fs_info, ret, - "Couldn't read target root for tree log recovery."); + btrfs_abort_transaction(trans, ret); goto error; } wc.replay_dest->log_root = log; - btrfs_record_root_in_trans(trans, wc.replay_dest); - ret = walk_log_tree(trans, log, &wc); + ret = btrfs_record_root_in_trans(trans, wc.replay_dest); + if (ret) + /* The loop needs to continue due to the root refs */ + btrfs_abort_transaction(trans, ret); + else + ret = walk_log_tree(trans, log, &wc); if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) { ret = fixup_inode_link_counts(trans, wc.replay_dest, path); + if (ret) + btrfs_abort_transaction(trans, ret); } if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) { @@ -6209,14 +7216,14 @@ again: * root->objectid_mutex is not acquired as log replay * could only happen during mount. */ - ret = btrfs_find_highest_objectid(root, - &root->highest_objectid); + ret = btrfs_init_root_free_objectid(root); + if (ret) + btrfs_abort_transaction(trans, ret); } wc.replay_dest->log_root = NULL; - free_extent_buffer(log->node); - free_extent_buffer(log->commit_root); - kfree(log); + btrfs_put_root(wc.replay_dest); + btrfs_put_root(log); if (ret) goto error; @@ -6247,15 +7254,15 @@ next: if (ret) return ret; - free_extent_buffer(log_root_tree->node); log_root_tree->log_root = NULL; clear_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags); - kfree(log_root_tree); + btrfs_put_root(log_root_tree); return 0; error: if (wc.trans) btrfs_end_transaction(wc.trans); + clear_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags); btrfs_free_path(path); return ret; } @@ -6342,28 +7349,31 @@ void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans, mutex_unlock(&dir->log_mutex); } -/* - * Call this after adding a new name for a file and it will properly - * update the log to reflect the new name. +/** + * Update the log after adding a new name for an inode. * - * @ctx can not be NULL when @sync_log is false, and should be NULL when it's - * true (because it's not used). + * @trans: Transaction handle. + * @old_dentry: The dentry associated with the old name and the old + * parent directory. + * @old_dir: The inode of the previous parent directory for the case + * of a rename. For a link operation, it must be NULL. + * @old_dir_index: The index number associated with the old name, meaningful + * only for rename operations (when @old_dir is not NULL). + * Ignored for link operations. + * @parent: The dentry associated with the directory under which the + * new name is located. * - * Return value depends on whether @sync_log is true or false. - * When true: returns BTRFS_NEED_TRANS_COMMIT if the transaction needs to be - * committed by the caller, and BTRFS_DONT_NEED_TRANS_COMMIT - * otherwise. - * When false: returns BTRFS_DONT_NEED_LOG_SYNC if the caller does not need to - * to sync the log, BTRFS_NEED_LOG_SYNC if it needs to sync the log, - * or BTRFS_NEED_TRANS_COMMIT if the transaction needs to be - * committed (without attempting to sync the log). + * Call this after adding a new name for an inode, as a result of a link or + * rename operation, and it will properly update the log to reflect the new name. */ -int btrfs_log_new_name(struct btrfs_trans_handle *trans, - struct btrfs_inode *inode, struct btrfs_inode *old_dir, - struct dentry *parent, - bool sync_log, struct btrfs_log_ctx *ctx) +void btrfs_log_new_name(struct btrfs_trans_handle *trans, + struct dentry *old_dentry, struct btrfs_inode *old_dir, + u64 old_dir_index, struct dentry *parent) { - struct btrfs_fs_info *fs_info = trans->fs_info; + struct btrfs_inode *inode = BTRFS_I(d_inode(old_dentry)); + struct btrfs_root *root = inode->root; + struct btrfs_log_ctx ctx; + bool log_pinned = false; int ret; /* @@ -6377,36 +7387,112 @@ int btrfs_log_new_name(struct btrfs_trans_handle *trans, * if this inode hasn't been logged and directory we're renaming it * from hasn't been logged, we don't need to log it */ - if (inode->logged_trans <= fs_info->last_trans_committed && - (!old_dir || old_dir->logged_trans <= fs_info->last_trans_committed)) - return sync_log ? BTRFS_DONT_NEED_TRANS_COMMIT : - BTRFS_DONT_NEED_LOG_SYNC; - - if (sync_log) { - struct btrfs_log_ctx ctx2; - - btrfs_init_log_ctx(&ctx2, &inode->vfs_inode); - ret = btrfs_log_inode_parent(trans, inode, parent, 0, LLONG_MAX, - LOG_INODE_EXISTS, &ctx2); - if (ret == BTRFS_NO_LOG_SYNC) - return BTRFS_DONT_NEED_TRANS_COMMIT; - else if (ret) - return BTRFS_NEED_TRANS_COMMIT; - - ret = btrfs_sync_log(trans, inode->root, &ctx2); - if (ret) - return BTRFS_NEED_TRANS_COMMIT; - return BTRFS_DONT_NEED_TRANS_COMMIT; + ret = inode_logged(trans, inode, NULL); + if (ret < 0) { + goto out; + } else if (ret == 0) { + if (!old_dir) + return; + /* + * If the inode was not logged and we are doing a rename (old_dir is not + * NULL), check if old_dir was logged - if it was not we can return and + * do nothing. + */ + ret = inode_logged(trans, old_dir, NULL); + if (ret < 0) + goto out; + else if (ret == 0) + return; } + ret = 0; + + /* + * If we are doing a rename (old_dir is not NULL) from a directory that + * was previously logged, make sure that on log replay we get the old + * dir entry deleted. This is needed because we will also log the new + * name of the renamed inode, so we need to make sure that after log + * replay we don't end up with both the new and old dir entries existing. + */ + if (old_dir && old_dir->logged_trans == trans->transid) { + struct btrfs_root *log = old_dir->root->log_root; + struct btrfs_path *path; + + ASSERT(old_dir_index >= BTRFS_DIR_START_INDEX); + + /* + * We have two inodes to update in the log, the old directory and + * the inode that got renamed, so we must pin the log to prevent + * anyone from syncing the log until we have updated both inodes + * in the log. + */ + ret = join_running_log_trans(root); + /* + * At least one of the inodes was logged before, so this should + * not fail, but if it does, it's not serious, just bail out and + * mark the log for a full commit. + */ + if (WARN_ON_ONCE(ret < 0)) + goto out; + log_pinned = true; - ASSERT(ctx); - ret = btrfs_log_inode_parent(trans, inode, parent, 0, LLONG_MAX, - LOG_INODE_EXISTS, ctx); - if (ret == BTRFS_NO_LOG_SYNC) - return BTRFS_DONT_NEED_LOG_SYNC; - else if (ret) - return BTRFS_NEED_TRANS_COMMIT; + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto out; + } - return BTRFS_NEED_LOG_SYNC; + /* + * Other concurrent task might be logging the old directory, + * as it can be triggered when logging other inode that had or + * still has a dentry in the old directory. We lock the old + * directory's log_mutex to ensure the deletion of the old + * name is persisted, because during directory logging we + * delete all BTRFS_DIR_LOG_INDEX_KEY keys and the deletion of + * the old name's dir index item is in the delayed items, so + * it could be missed by an in progress directory logging. + */ + mutex_lock(&old_dir->log_mutex); + ret = del_logged_dentry(trans, log, path, btrfs_ino(old_dir), + old_dentry->d_name.name, + old_dentry->d_name.len, old_dir_index); + if (ret > 0) { + /* + * The dentry does not exist in the log, so record its + * deletion. + */ + btrfs_release_path(path); + ret = insert_dir_log_key(trans, log, path, + btrfs_ino(old_dir), + old_dir_index, old_dir_index); + } + mutex_unlock(&old_dir->log_mutex); + + btrfs_free_path(path); + if (ret < 0) + goto out; + } + + btrfs_init_log_ctx(&ctx, &inode->vfs_inode); + ctx.logging_new_name = true; + /* + * We don't care about the return value. If we fail to log the new name + * then we know the next attempt to sync the log will fallback to a full + * transaction commit (due to a call to btrfs_set_log_full_commit()), so + * we don't need to worry about getting a log committed that has an + * inconsistent state after a rename operation. + */ + btrfs_log_inode_parent(trans, inode, parent, LOG_INODE_EXISTS, &ctx); + ASSERT(list_empty(&ctx.conflict_inodes)); +out: + /* + * If an error happened mark the log for a full commit because it's not + * consistent and up to date or we couldn't find out if one of the + * inodes was logged before in this transaction. Do it before unpinning + * the log, to avoid any races with someone else trying to commit it. + */ + if (ret < 0) + btrfs_set_log_full_commit(trans); + if (log_pinned) + btrfs_end_log_trans(root); } |