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-rw-r--r--fs/btrfs/disk-io.c16
-rw-r--r--fs/btrfs/ioctl.c6
-rw-r--r--fs/btrfs/transaction.c58
3 files changed, 41 insertions, 39 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 02369a3c162e..7d84651e850b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -62,7 +62,7 @@ static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
struct btrfs_root *root);
-static void btrfs_destroy_pending_snapshots(struct btrfs_transaction *t);
+static void btrfs_evict_pending_snapshots(struct btrfs_transaction *t);
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
static int btrfs_destroy_marked_extents(struct btrfs_root *root,
struct extent_io_tree *dirty_pages,
@@ -3687,7 +3687,7 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
return ret;
}
-static void btrfs_destroy_pending_snapshots(struct btrfs_transaction *t)
+static void btrfs_evict_pending_snapshots(struct btrfs_transaction *t)
{
struct btrfs_pending_snapshot *snapshot;
struct list_head splice;
@@ -3700,10 +3700,8 @@ static void btrfs_destroy_pending_snapshots(struct btrfs_transaction *t)
snapshot = list_entry(splice.next,
struct btrfs_pending_snapshot,
list);
-
+ snapshot->error = -ECANCELED;
list_del_init(&snapshot->list);
-
- kfree(snapshot);
}
}
@@ -3840,6 +3838,8 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
cur_trans->blocked = 1;
wake_up(&root->fs_info->transaction_blocked_wait);
+ btrfs_evict_pending_snapshots(cur_trans);
+
cur_trans->blocked = 0;
wake_up(&root->fs_info->transaction_wait);
@@ -3849,8 +3849,6 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
btrfs_destroy_delayed_inodes(root);
btrfs_assert_delayed_root_empty(root);
- btrfs_destroy_pending_snapshots(cur_trans);
-
btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages,
EXTENT_DIRTY);
btrfs_destroy_pinned_extent(root,
@@ -3894,6 +3892,8 @@ int btrfs_cleanup_transaction(struct btrfs_root *root)
if (waitqueue_active(&root->fs_info->transaction_blocked_wait))
wake_up(&root->fs_info->transaction_blocked_wait);
+ btrfs_evict_pending_snapshots(t);
+
t->blocked = 0;
smp_mb();
if (waitqueue_active(&root->fs_info->transaction_wait))
@@ -3907,8 +3907,6 @@ int btrfs_cleanup_transaction(struct btrfs_root *root)
btrfs_destroy_delayed_inodes(root);
btrfs_assert_delayed_root_empty(root);
- btrfs_destroy_pending_snapshots(t);
-
btrfs_destroy_delalloc_inodes(root);
spin_lock(&root->fs_info->trans_lock);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index b908960c9746..94c0e42dfa1e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -596,12 +596,8 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
ret = btrfs_commit_transaction(trans,
root->fs_info->extent_root);
}
- if (ret) {
- /* cleanup_transaction has freed this for us */
- if (trans->aborted)
- pending_snapshot = NULL;
+ if (ret)
goto fail;
- }
ret = pending_snapshot->error;
if (ret)
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f11c2e0a3746..d8fce6fe9cf8 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1053,7 +1053,12 @@ int btrfs_defrag_root(struct btrfs_root *root)
/*
* new snapshots need to be created at a very specific time in the
- * transaction commit. This does the actual creation
+ * transaction commit. This does the actual creation.
+ *
+ * Note:
+ * If the error which may affect the commitment of the current transaction
+ * happens, we should return the error number. If the error which just affect
+ * the creation of the pending snapshots, just return 0.
*/
static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
@@ -1072,7 +1077,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
struct extent_buffer *tmp;
struct extent_buffer *old;
struct timespec cur_time = CURRENT_TIME;
- int ret;
+ int ret = 0;
u64 to_reserve = 0;
u64 index = 0;
u64 objectid;
@@ -1081,40 +1086,36 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
if (!path) {
- ret = pending->error = -ENOMEM;
- return ret;
+ pending->error = -ENOMEM;
+ return 0;
}
new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
if (!new_root_item) {
- ret = pending->error = -ENOMEM;
+ pending->error = -ENOMEM;
goto root_item_alloc_fail;
}
- ret = btrfs_find_free_objectid(tree_root, &objectid);
- if (ret) {
- pending->error = ret;
+ pending->error = btrfs_find_free_objectid(tree_root, &objectid);
+ if (pending->error)
goto no_free_objectid;
- }
btrfs_reloc_pre_snapshot(trans, pending, &to_reserve);
if (to_reserve > 0) {
- ret = btrfs_block_rsv_add(root, &pending->block_rsv,
- to_reserve,
- BTRFS_RESERVE_NO_FLUSH);
- if (ret) {
- pending->error = ret;
+ pending->error = btrfs_block_rsv_add(root,
+ &pending->block_rsv,
+ to_reserve,
+ BTRFS_RESERVE_NO_FLUSH);
+ if (pending->error)
goto no_free_objectid;
- }
}
- ret = btrfs_qgroup_inherit(trans, fs_info, root->root_key.objectid,
- objectid, pending->inherit);
- if (ret) {
- pending->error = ret;
+ pending->error = btrfs_qgroup_inherit(trans, fs_info,
+ root->root_key.objectid,
+ objectid, pending->inherit);
+ if (pending->error)
goto no_free_objectid;
- }
key.objectid = objectid;
key.offset = (u64)-1;
@@ -1142,7 +1143,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
dentry->d_name.len, 0);
if (dir_item != NULL && !IS_ERR(dir_item)) {
pending->error = -EEXIST;
- goto fail;
+ goto dir_item_existed;
} else if (IS_ERR(dir_item)) {
ret = PTR_ERR(dir_item);
btrfs_abort_transaction(trans, root, ret);
@@ -1273,6 +1274,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
if (ret)
btrfs_abort_transaction(trans, root, ret);
fail:
+ pending->error = ret;
+dir_item_existed:
trans->block_rsv = rsv;
trans->bytes_reserved = 0;
no_free_objectid:
@@ -1288,12 +1291,17 @@ root_item_alloc_fail:
static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{
- struct btrfs_pending_snapshot *pending;
+ struct btrfs_pending_snapshot *pending, *next;
struct list_head *head = &trans->transaction->pending_snapshots;
+ int ret = 0;
- list_for_each_entry(pending, head, list)
- create_pending_snapshot(trans, fs_info, pending);
- return 0;
+ list_for_each_entry_safe(pending, next, head, list) {
+ list_del(&pending->list);
+ ret = create_pending_snapshot(trans, fs_info, pending);
+ if (ret)
+ break;
+ }
+ return ret;
}
static void update_super_roots(struct btrfs_root *root)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.