diff options
Diffstat (limited to 'drivers/staging/pohmelfs/dir.c')
| -rw-r--r-- | drivers/staging/pohmelfs/dir.c | 1102 |
1 files changed, 0 insertions, 1102 deletions
diff --git a/drivers/staging/pohmelfs/dir.c b/drivers/staging/pohmelfs/dir.c deleted file mode 100644 index 2ee4491b7136..000000000000 --- a/drivers/staging/pohmelfs/dir.c +++ /dev/null @@ -1,1102 +0,0 @@ -/* - * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> - * All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/jhash.h> -#include <linux/namei.h> -#include <linux/slab.h> -#include <linux/pagemap.h> - -#include "netfs.h" - -static int pohmelfs_cmp_hash(struct pohmelfs_name *n, u32 hash) -{ - if (n->hash > hash) - return -1; - if (n->hash < hash) - return 1; - - return 0; -} - -static struct pohmelfs_name *pohmelfs_search_hash_unprecise(struct pohmelfs_inode *pi, u32 hash) -{ - struct rb_node *n = pi->hash_root.rb_node; - struct pohmelfs_name *tmp = NULL; - int cmp; - - while (n) { - tmp = rb_entry(n, struct pohmelfs_name, hash_node); - - cmp = pohmelfs_cmp_hash(tmp, hash); - if (cmp < 0) - n = n->rb_left; - else if (cmp > 0) - n = n->rb_right; - else - break; - - } - - return tmp; -} - -struct pohmelfs_name *pohmelfs_search_hash(struct pohmelfs_inode *pi, u32 hash) -{ - struct pohmelfs_name *tmp; - - tmp = pohmelfs_search_hash_unprecise(pi, hash); - if (tmp && (tmp->hash == hash)) - return tmp; - - return NULL; -} - -static void __pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *node) -{ - rb_erase(&node->hash_node, &parent->hash_root); -} - -/* - * Remove name cache entry from its caches and free it. - */ -static void pohmelfs_name_free(struct pohmelfs_inode *parent, struct pohmelfs_name *node) -{ - __pohmelfs_name_del(parent, node); - list_del(&node->sync_create_entry); - kfree(node); -} - -static struct pohmelfs_name *pohmelfs_insert_hash(struct pohmelfs_inode *pi, - struct pohmelfs_name *new) -{ - struct rb_node **n = &pi->hash_root.rb_node, *parent = NULL; - struct pohmelfs_name *ret = NULL, *tmp; - int cmp; - - while (*n) { - parent = *n; - - tmp = rb_entry(parent, struct pohmelfs_name, hash_node); - - cmp = pohmelfs_cmp_hash(tmp, new->hash); - if (cmp < 0) - n = &parent->rb_left; - else if (cmp > 0) - n = &parent->rb_right; - else { - ret = tmp; - break; - } - } - - if (ret) { - printk("%s: exist: parent: %llu, ino: %llu, hash: %x, len: %u, data: '%s', " - "new: ino: %llu, hash: %x, len: %u, data: '%s'.\n", - __func__, pi->ino, - ret->ino, ret->hash, ret->len, ret->data, - new->ino, new->hash, new->len, new->data); - ret->ino = new->ino; - return ret; - } - - rb_link_node(&new->hash_node, parent, n); - rb_insert_color(&new->hash_node, &pi->hash_root); - - return NULL; -} - -/* - * Free name cache for given inode. - */ -void pohmelfs_free_names(struct pohmelfs_inode *parent) -{ - struct rb_node *rb_node; - struct pohmelfs_name *n; - - for (rb_node = rb_first(&parent->hash_root); rb_node;) { - n = rb_entry(rb_node, struct pohmelfs_name, hash_node); - rb_node = rb_next(rb_node); - - pohmelfs_name_free(parent, n); - } -} - -static void pohmelfs_fix_offset(struct pohmelfs_inode *parent, struct pohmelfs_name *node) -{ - parent->total_len -= node->len; -} - -/* - * Free name cache entry helper. - */ -void pohmelfs_name_del(struct pohmelfs_inode *parent, struct pohmelfs_name *node) -{ - pohmelfs_fix_offset(parent, node); - pohmelfs_name_free(parent, node); -} - -/* - * Insert new name cache entry into all hash cache. - */ -static int pohmelfs_insert_name(struct pohmelfs_inode *parent, struct pohmelfs_name *n) -{ - struct pohmelfs_name *name; - - name = pohmelfs_insert_hash(parent, n); - if (name) - return -EEXIST; - - parent->total_len += n->len; - list_add_tail(&n->sync_create_entry, &parent->sync_create_list); - - return 0; -} - -/* - * Allocate new name cache entry. - */ -static struct pohmelfs_name *pohmelfs_name_alloc(unsigned int len) -{ - struct pohmelfs_name *n; - - n = kzalloc(sizeof(struct pohmelfs_name) + len, GFP_KERNEL); - if (!n) - return NULL; - - INIT_LIST_HEAD(&n->sync_create_entry); - - n->data = (char *)(n+1); - - return n; -} - -/* - * Add new name entry into directory's cache. - */ -static int pohmelfs_add_dir(struct pohmelfs_sb *psb, struct pohmelfs_inode *parent, - struct pohmelfs_inode *npi, struct qstr *str, unsigned int mode, int link) -{ - int err = -ENOMEM; - struct pohmelfs_name *n; - - n = pohmelfs_name_alloc(str->len + 1); - if (!n) - goto err_out_exit; - - n->ino = npi->ino; - n->mode = mode; - n->len = str->len; - n->hash = str->hash; - sprintf(n->data, "%s", str->name); - - mutex_lock(&parent->offset_lock); - err = pohmelfs_insert_name(parent, n); - mutex_unlock(&parent->offset_lock); - - if (err) { - if (err != -EEXIST) - goto err_out_free; - kfree(n); - } - - return 0; - -err_out_free: - kfree(n); -err_out_exit: - return err; -} - -/* - * Create new inode for given parameters (name, inode info, parent). - * This does not create object on the server, it will be synced there during writeback. - */ -struct pohmelfs_inode *pohmelfs_new_inode(struct pohmelfs_sb *psb, - struct pohmelfs_inode *parent, struct qstr *str, - struct netfs_inode_info *info, int link) -{ - struct inode *new = NULL; - struct pohmelfs_inode *npi; - int err = -EEXIST; - - dprintk("%s: creating inode: parent: %llu, ino: %llu, str: %p.\n", - __func__, (parent) ? parent->ino : 0, info->ino, str); - - err = -ENOMEM; - new = iget_locked(psb->sb, info->ino); - if (!new) - goto err_out_exit; - - npi = POHMELFS_I(new); - npi->ino = info->ino; - err = 0; - - if (new->i_state & I_NEW) { - dprintk("%s: filling VFS inode: %lu/%llu.\n", - __func__, new->i_ino, info->ino); - pohmelfs_fill_inode(new, info); - - if (S_ISDIR(info->mode)) { - struct qstr s; - - s.name = "."; - s.len = 1; - s.hash = jhash(s.name, s.len, 0); - - err = pohmelfs_add_dir(psb, npi, npi, &s, info->mode, 0); - if (err) - goto err_out_put; - - s.name = ".."; - s.len = 2; - s.hash = jhash(s.name, s.len, 0); - - err = pohmelfs_add_dir(psb, npi, (parent) ? parent : npi, &s, - (parent) ? parent->vfs_inode.i_mode : npi->vfs_inode.i_mode, 0); - if (err) - goto err_out_put; - } - } - - if (str) { - if (parent) { - err = pohmelfs_add_dir(psb, parent, npi, str, info->mode, link); - - dprintk("%s: %s inserted name: '%s', new_offset: %llu, ino: %llu, parent: %llu.\n", - __func__, (err) ? "unsuccessfully" : "successfully", - str->name, parent->total_len, info->ino, parent->ino); - - if (err && err != -EEXIST) - goto err_out_put; - } - } - - if (new->i_state & I_NEW) { - if (parent) - mark_inode_dirty(&parent->vfs_inode); - mark_inode_dirty(new); - } - - set_bit(NETFS_INODE_OWNED, &npi->state); - npi->lock_type = POHMELFS_WRITE_LOCK; - unlock_new_inode(new); - - return npi; - -err_out_put: - printk("%s: putting inode: %p, npi: %p, error: %d.\n", __func__, new, npi, err); - iput(new); -err_out_exit: - return ERR_PTR(err); -} - -static int pohmelfs_remote_sync_complete(struct page **pages, unsigned int page_num, - void *private, int err) -{ - struct pohmelfs_inode *pi = private; - struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); - - dprintk("%s: ino: %llu, err: %d.\n", __func__, pi->ino, err); - - if (err) - pi->error = err; - wake_up(&psb->wait); - pohmelfs_put_inode(pi); - - return err; -} - -/* - * Receive directory content from the server. - * This should be only done for objects, which were not created locally, - * and which were not synced previously. - */ -static int pohmelfs_sync_remote_dir(struct pohmelfs_inode *pi) -{ - struct inode *inode = &pi->vfs_inode; - struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); - long ret = psb->wait_on_page_timeout; - int err; - - dprintk("%s: dir: %llu, state: %lx: remote_synced: %d.\n", - __func__, pi->ino, pi->state, test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state)); - - if (test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state)) - return 0; - - if (!igrab(inode)) { - err = -ENOENT; - goto err_out_exit; - } - - err = pohmelfs_meta_command(pi, NETFS_READDIR, NETFS_TRANS_SINGLE_DST, - pohmelfs_remote_sync_complete, pi, 0); - if (err) - goto err_out_exit; - - pi->error = 0; - ret = wait_event_interruptible_timeout(psb->wait, - test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &pi->state) || pi->error, ret); - dprintk("%s: awake dir: %llu, ret: %ld, err: %d.\n", __func__, pi->ino, ret, pi->error); - if (ret <= 0) { - err = ret; - if (!err) - err = -ETIMEDOUT; - goto err_out_exit; - } - - if (pi->error) - return pi->error; - - return 0; - -err_out_exit: - clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); - - return err; -} - -static int pohmelfs_dir_open(struct inode *inode, struct file *file) -{ - file->private_data = NULL; - return 0; -} - -/* - * VFS readdir callback. Syncs directory content from server if needed, - * and provides direntry info to the userspace. - */ -static int pohmelfs_readdir(struct file *file, void *dirent, filldir_t filldir) -{ - struct inode *inode = file->f_path.dentry->d_inode; - struct pohmelfs_inode *pi = POHMELFS_I(inode); - struct pohmelfs_name *n; - struct rb_node *rb_node; - int err = 0, mode; - u64 len; - - dprintk("%s: parent: %llu, fpos: %llu, hash: %08lx.\n", - __func__, pi->ino, (u64)file->f_pos, - (unsigned long)file->private_data); -#if 0 - err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_READ_LOCK); - if (err) - return err; -#endif - err = pohmelfs_sync_remote_dir(pi); - if (err) - return err; - - if (file->private_data && (file->private_data == (void *)(unsigned long)file->f_pos)) - return 0; - - mutex_lock(&pi->offset_lock); - n = pohmelfs_search_hash_unprecise(pi, (unsigned long)file->private_data); - - while (n) { - mode = (n->mode >> 12) & 15; - - dprintk("%s: offset: %llu, parent ino: %llu, name: '%s', len: %u, ino: %llu, " - "mode: %o/%o, fpos: %llu, hash: %08x.\n", - __func__, file->f_pos, pi->ino, n->data, n->len, - n->ino, n->mode, mode, file->f_pos, n->hash); - - file->private_data = (void *)(unsigned long)n->hash; - - len = n->len; - err = filldir(dirent, n->data, n->len, file->f_pos, n->ino, mode); - - if (err < 0) { - dprintk("%s: err: %d.\n", __func__, err); - err = 0; - break; - } - - file->f_pos += len; - - rb_node = rb_next(&n->hash_node); - - if (!rb_node || (rb_node == &n->hash_node)) { - file->private_data = (void *)(unsigned long)file->f_pos; - break; - } - - n = rb_entry(rb_node, struct pohmelfs_name, hash_node); - } - mutex_unlock(&pi->offset_lock); - - return err; -} - -static loff_t pohmelfs_dir_lseek(struct file *file, loff_t offset, int origin) -{ - file->f_pos = offset; - file->private_data = NULL; - return offset; -} - -const struct file_operations pohmelfs_dir_fops = { - .open = pohmelfs_dir_open, - .read = generic_read_dir, - .llseek = pohmelfs_dir_lseek, - .readdir = pohmelfs_readdir, -}; - -/* - * Lookup single object on server. - */ -static int pohmelfs_lookup_single(struct pohmelfs_inode *parent, - struct qstr *str, u64 ino) -{ - struct pohmelfs_sb *psb = POHMELFS_SB(parent->vfs_inode.i_sb); - long ret = msecs_to_jiffies(5000); - int err; - - set_bit(NETFS_COMMAND_PENDING, &parent->state); - err = pohmelfs_meta_command_data(parent, parent->ino, NETFS_LOOKUP, - (char *)str->name, NETFS_TRANS_SINGLE_DST, NULL, NULL, ino); - if (err) - goto err_out_exit; - - err = 0; - ret = wait_event_interruptible_timeout(psb->wait, - !test_bit(NETFS_COMMAND_PENDING, &parent->state), ret); - if (ret <= 0) { - err = ret; - if (!err) - err = -ETIMEDOUT; - } - - if (err) - goto err_out_exit; - - return 0; - -err_out_exit: - clear_bit(NETFS_COMMAND_PENDING, &parent->state); - - printk("%s: failed: parent: %llu, ino: %llu, name: '%s', err: %d.\n", - __func__, parent->ino, ino, str->name, err); - - return err; -} - -/* - * VFS lookup callback. - * We first try to get inode number from local name cache, if we have one, - * then inode can be found in inode cache. If there is no inode or no object in - * local cache, try to lookup it on server. This only should be done for directories, - * which were not created locally, otherwise remote server does not know about dir at all, - * so no need to try to know that. - */ -struct dentry *pohmelfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) -{ - struct pohmelfs_inode *parent = POHMELFS_I(dir); - struct pohmelfs_name *n; - struct inode *inode = NULL; - unsigned long ino = 0; - int err, lock_type = POHMELFS_READ_LOCK, need_lock = 1; - struct qstr str = dentry->d_name; - - if ((nd->intent.open.flags & O_ACCMODE) != O_RDONLY) - lock_type = POHMELFS_WRITE_LOCK; - - if (test_bit(NETFS_INODE_OWNED, &parent->state)) { - if (lock_type == parent->lock_type) - need_lock = 0; - if ((lock_type == POHMELFS_READ_LOCK) && (parent->lock_type == POHMELFS_WRITE_LOCK)) - need_lock = 0; - } - - if ((lock_type == POHMELFS_READ_LOCK) && !test_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state)) - need_lock = 1; - - str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); - - mutex_lock(&parent->offset_lock); - n = pohmelfs_search_hash(parent, str.hash); - if (n) - ino = n->ino; - mutex_unlock(&parent->offset_lock); - - dprintk("%s: start ino: %lu, inode: %p, name: '%s', hash: %x, parent_state: %lx, need_lock: %d.\n", - __func__, ino, inode, str.name, str.hash, parent->state, need_lock); - - if (ino) { - inode = ilookup(dir->i_sb, ino); - if (inode) - goto out; - } - - dprintk("%s: no inode dir: %p, dir_ino: %llu, name: '%s', len: %u, dir_state: %lx, ino: %lu.\n", - __func__, dir, parent->ino, - str.name, str.len, parent->state, ino); - - if (!ino) { - if (!need_lock) - goto out; - } - - err = pohmelfs_data_lock(parent, 0, ~0, lock_type); - if (err) - goto out; - - err = pohmelfs_lookup_single(parent, &str, ino); - if (err) - goto out; - - if (!ino) { - mutex_lock(&parent->offset_lock); - n = pohmelfs_search_hash(parent, str.hash); - if (n) - ino = n->ino; - mutex_unlock(&parent->offset_lock); - } - - if (ino) { - inode = ilookup(dir->i_sb, ino); - dprintk("%s: second lookup ino: %lu, inode: %p, name: '%s', hash: %x.\n", - __func__, ino, inode, str.name, str.hash); - if (!inode) { - dprintk("%s: No inode for ino: %lu, name: '%s', hash: %x.\n", - __func__, ino, str.name, str.hash); - /* return NULL; */ - return ERR_PTR(-EACCES); - } - } else { - printk("%s: No inode number : name: '%s', hash: %x.\n", - __func__, str.name, str.hash); - } -out: - return d_splice_alias(inode, dentry); -} - -/* - * Create new object in local cache. Object will be synced to server - * during writeback for given inode. - */ -struct pohmelfs_inode *pohmelfs_create_entry_local(struct pohmelfs_sb *psb, - struct pohmelfs_inode *parent, struct qstr *str, u64 start, umode_t mode) -{ - struct pohmelfs_inode *npi; - int err = -ENOMEM; - struct netfs_inode_info info; - - dprintk("%s: name: '%s', mode: %ho, start: %llu.\n", - __func__, str->name, mode, start); - - info.mode = mode; - info.ino = start; - - if (!start) - info.ino = pohmelfs_new_ino(psb); - - info.nlink = S_ISDIR(mode) ? 2 : 1; - info.uid = current_fsuid(); - info.gid = current_fsgid(); - info.size = 0; - info.blocksize = 512; - info.blocks = 0; - info.rdev = 0; - info.version = 0; - - npi = pohmelfs_new_inode(psb, parent, str, &info, !!start); - if (IS_ERR(npi)) { - err = PTR_ERR(npi); - goto err_out_unlock; - } - - return npi; - -err_out_unlock: - dprintk("%s: err: %d.\n", __func__, err); - return ERR_PTR(err); -} - -/* - * Create local object and bind it to dentry. - */ -static int pohmelfs_create_entry(struct inode *dir, struct dentry *dentry, - u64 start, umode_t mode) -{ - struct pohmelfs_sb *psb = POHMELFS_SB(dir->i_sb); - struct pohmelfs_inode *npi, *parent; - struct qstr str = dentry->d_name; - int err; - - parent = POHMELFS_I(dir); - - err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK); - if (err) - return err; - - str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); - - npi = pohmelfs_create_entry_local(psb, parent, &str, start, mode); - if (IS_ERR(npi)) - return PTR_ERR(npi); - - d_instantiate(dentry, &npi->vfs_inode); - - dprintk("%s: parent: %llu, inode: %llu, name: '%s', parent_nlink: %d, nlink: %d.\n", - __func__, parent->ino, npi->ino, dentry->d_name.name, - (signed)dir->i_nlink, (signed)npi->vfs_inode.i_nlink); - - return 0; -} - -/* - * VFS create and mkdir callbacks. - */ -static int pohmelfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, - struct nameidata *nd) -{ - return pohmelfs_create_entry(dir, dentry, 0, mode); -} - -static int pohmelfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) -{ - int err; - - inode_inc_link_count(dir); - err = pohmelfs_create_entry(dir, dentry, 0, mode | S_IFDIR); - if (err) - inode_dec_link_count(dir); - - return err; -} - -static int pohmelfs_remove_entry(struct inode *dir, struct dentry *dentry) -{ - struct pohmelfs_sb *psb = POHMELFS_SB(dir->i_sb); - struct inode *inode = dentry->d_inode; - struct pohmelfs_inode *parent = POHMELFS_I(dir), *pi = POHMELFS_I(inode); - struct pohmelfs_name *n; - int err = -ENOENT; - struct qstr str = dentry->d_name; - - err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK); - if (err) - return err; - - str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); - - dprintk("%s: dir_ino: %llu, inode: %llu, name: '%s', nlink: %d.\n", - __func__, parent->ino, pi->ino, - str.name, (signed)inode->i_nlink); - - BUG_ON(!inode); - - mutex_lock(&parent->offset_lock); - n = pohmelfs_search_hash(parent, str.hash); - if (n) { - pohmelfs_fix_offset(parent, n); - if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state)) - pohmelfs_remove_child(pi, n); - - pohmelfs_name_free(parent, n); - err = 0; - } - mutex_unlock(&parent->offset_lock); - - if (!err) { - psb->avail_size += inode->i_size; - - pohmelfs_inode_del_inode(psb, pi); - - mark_inode_dirty(dir); - - inode->i_ctime = dir->i_ctime; - if (inode->i_nlink) - inode_dec_link_count(inode); - } - - return err; -} - -/* - * Unlink and rmdir VFS callbacks. - */ -static int pohmelfs_unlink(struct inode *dir, struct dentry *dentry) -{ - return pohmelfs_remove_entry(dir, dentry); -} - -static int pohmelfs_rmdir(struct inode *dir, struct dentry *dentry) -{ - int err; - struct inode *inode = dentry->d_inode; - - dprintk("%s: parent: %llu, inode: %llu, name: '%s', parent_nlink: %d, nlink: %d.\n", - __func__, POHMELFS_I(dir)->ino, POHMELFS_I(inode)->ino, - dentry->d_name.name, (signed)dir->i_nlink, (signed)inode->i_nlink); - - err = pohmelfs_remove_entry(dir, dentry); - if (!err) { - inode_dec_link_count(dir); - inode_dec_link_count(inode); - } - - return err; -} - -/* - * Link creation is synchronous. - * I'm lazy. - * Earth is somewhat round. - */ -static int pohmelfs_create_link(struct pohmelfs_inode *parent, struct qstr *obj, - struct pohmelfs_inode *target, struct qstr *tstr) -{ - struct super_block *sb = parent->vfs_inode.i_sb; - struct pohmelfs_sb *psb = POHMELFS_SB(sb); - struct netfs_cmd *cmd; - struct netfs_trans *t; - void *data; - int err, parent_len, target_len = 0, cur_len, path_size = 0; - - err = pohmelfs_data_lock(parent, 0, ~0, POHMELFS_WRITE_LOCK); - if (err) - return err; - - err = sb->s_op->write_inode(&parent->vfs_inode, 0); - if (err) - goto err_out_exit; - - if (tstr) - target_len = tstr->len; - - parent_len = pohmelfs_path_length(parent); - if (target) - target_len += pohmelfs_path_length(target); - - if (parent_len < 0) { - err = parent_len; - goto err_out_exit; - } - - if (target_len < 0) { - err = target_len; - goto err_out_exit; - } - - t = netfs_trans_alloc(psb, parent_len + target_len + obj->len + 2, 0, 0); - if (!t) { - err = -ENOMEM; - goto err_out_exit; - } - cur_len = netfs_trans_cur_len(t); - - cmd = netfs_trans_current(t); - if (IS_ERR(cmd)) { - err = PTR_ERR(cmd); - goto err_out_free; - } - - data = (void *)(cmd + 1); - cur_len -= sizeof(struct netfs_cmd); - - err = pohmelfs_construct_path_string(parent, data, parent_len); - if (err > 0) { - /* Do not place null-byte before the slash */ - path_size = err - 1; - cur_len -= path_size; - - err = snprintf(data + path_size, cur_len, "/%s|", obj->name); - - path_size += err; - cur_len -= err; - - cmd->ext = path_size - 1; /* No | symbol */ - - if (target) { - err = pohmelfs_construct_path_string(target, data + path_size, target_len); - if (err > 0) { - path_size += err; - cur_len -= err; - } - } - } - - if (err < 0) - goto err_out_free; - - cmd->start = 0; - - if (!target && tstr) { - if (tstr->len > cur_len - 1) { - err = -ENAMETOOLONG; - goto err_out_free; - } - - err = snprintf(data + path_size, cur_len, "%s", tstr->name) + 1; /* 0-byte */ - path_size += err; - cur_len -= err; - cmd->start = 1; - } - - dprintk("%s: parent: %llu, obj: '%s', target_inode: %llu, target_str: '%s', full: '%s'.\n", - __func__, parent->ino, obj->name, (target) ? target->ino : 0, (tstr) ? tstr->name : NULL, - (char *)data); - - cmd->cmd = NETFS_LINK; - cmd->size = path_size; - cmd->id = parent->ino; - - netfs_convert_cmd(cmd); - - netfs_trans_update(cmd, t, path_size); - - err = netfs_trans_finish(t, psb); - if (err) - goto err_out_exit; - - return 0; - -err_out_free: - t->result = err; - netfs_trans_put(t); -err_out_exit: - return err; -} - -/* - * VFS hard and soft link callbacks. - */ -static int pohmelfs_link(struct dentry *old_dentry, struct inode *dir, - struct dentry *dentry) -{ - struct inode *inode = old_dentry->d_inode; - struct pohmelfs_inode *pi = POHMELFS_I(inode); - int err; - struct qstr str = dentry->d_name; - - str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); - - err = inode->i_sb->s_op->write_inode(inode, 0); - if (err) - return err; - - err = pohmelfs_create_link(POHMELFS_I(dir), &str, pi, NULL); - if (err) - return err; - - return pohmelfs_create_entry(dir, dentry, pi->ino, inode->i_mode); -} - -static int pohmelfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) -{ - struct qstr sym_str; - struct qstr str = dentry->d_name; - struct inode *inode; - int err; - - str.hash = jhash(dentry->d_name.name, dentry->d_name.len, 0); - - sym_str.name = symname; - sym_str.len = strlen(symname); - - err = pohmelfs_create_link(POHMELFS_I(dir), &str, NULL, &sym_str); - if (err) - goto err_out_exit; - - err = pohmelfs_create_entry(dir, dentry, 0, S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO); - if (err) - goto err_out_exit; - - inode = dentry->d_inode; - - err = page_symlink(inode, symname, sym_str.len + 1); - if (err) - goto err_out_put; - - return 0; - -err_out_put: - iput(inode); -err_out_exit: - return err; -} - -static int pohmelfs_send_rename(struct pohmelfs_inode *pi, struct pohmelfs_inode *parent, - struct qstr *str) -{ - int path_len, err, total_len = 0, inode_len, parent_len; - char *path; - struct netfs_trans *t; - struct netfs_cmd *cmd; - struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); - - parent_len = pohmelfs_path_length(parent); - inode_len = pohmelfs_path_length(pi); - - if (parent_len < 0 || inode_len < 0) - return -EINVAL; - - path_len = parent_len + inode_len + str->len + 3; - - t = netfs_trans_alloc(psb, path_len, 0, 0); - if (!t) - return -ENOMEM; - - cmd = netfs_trans_current(t); - path = (char *)(cmd + 1); - - err = pohmelfs_construct_path_string(pi, path, inode_len); - if (err < 0) - goto err_out_unlock; - - cmd->ext = err; - - path += err; - total_len += err; - path_len -= err; - - *path = '|'; - path++; - total_len++; - path_len--; - - err = pohmelfs_construct_path_string(parent, path, parent_len); - if (err < 0) - goto err_out_unlock; - - /* - * Do not place a null-byte before the final slash and the name. - */ - err--; - path += err; - total_len += err; - path_len -= err; - - err = snprintf(path, path_len - 1, "/%s", str->name); - - total_len += err + 1; /* 0 symbol */ - path_len -= err + 1; - - cmd->cmd = NETFS_RENAME; - cmd->id = pi->ino; - cmd->start = parent->ino; - cmd->size = total_len; - - netfs_convert_cmd(cmd); - - netfs_trans_update(cmd, t, total_len); - - return netfs_trans_finish(t, psb); - -err_out_unlock: - netfs_trans_free(t); - return err; -} - -static int pohmelfs_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry) -{ - struct inode *inode = old_dentry->d_inode; - struct pohmelfs_inode *old_parent, *pi, *new_parent; - struct qstr str = new_dentry->d_name; - struct pohmelfs_name *n; - unsigned int old_hash; - int err = -ENOENT; - - pi = POHMELFS_I(inode); - old_parent = POHMELFS_I(old_dir); - - if (new_dir) - new_dir->i_sb->s_op->write_inode(new_dir, 0); - - old_hash = jhash(old_dentry->d_name.name, old_dentry->d_name.len, 0); - str.hash = jhash(new_dentry->d_name.name, new_dentry->d_name.len, 0); - - str.len = new_dentry->d_name.len; - str.name = new_dentry->d_name.name; - str.hash = jhash(new_dentry->d_name.name, new_dentry->d_name.len, 0); - - if (new_dir) { - new_parent = POHMELFS_I(new_dir); - err = -ENOTEMPTY; - - if (S_ISDIR(inode->i_mode) && - new_parent->total_len <= 3) - goto err_out_exit; - } else { - new_parent = old_parent; - } - - dprintk("%s: ino: %llu, parent: %llu, name: '%s' -> parent: %llu, name: '%s', i_size: %llu.\n", - __func__, pi->ino, old_parent->ino, old_dentry->d_name.name, - new_parent->ino, new_dentry->d_name.name, inode->i_size); - - if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state) && - test_bit(NETFS_INODE_OWNED, &pi->state)) { - err = pohmelfs_send_rename(pi, new_parent, &str); - if (err) - goto err_out_exit; - } - - n = pohmelfs_name_alloc(str.len + 1); - if (!n) - goto err_out_exit; - - mutex_lock(&new_parent->offset_lock); - n->ino = pi->ino; - n->mode = inode->i_mode; - n->len = str.len; - n->hash = str.hash; - sprintf(n->data, "%s", str.name); - - err = pohmelfs_insert_name(new_parent, n); - mutex_unlock(&new_parent->offset_lock); - - if (err) - goto err_out_exit; - - mutex_lock(&old_parent->offset_lock); - n = pohmelfs_search_hash(old_parent, old_hash); - if (n) - pohmelfs_name_del(old_parent, n); - mutex_unlock(&old_parent->offset_lock); - - mark_inode_dirty(inode); - mark_inode_dirty(&new_parent->vfs_inode); - - WARN_ON_ONCE(list_empty(&inode->i_dentry)); - - return 0; - -err_out_exit: - - clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); - - return err; -} - -/* - * POHMELFS directory inode operations. - */ -const struct inode_operations pohmelfs_dir_inode_ops = { - .link = pohmelfs_link, - .symlink = pohmelfs_symlink, - .unlink = pohmelfs_unlink, - .mkdir = pohmelfs_mkdir, - .rmdir = pohmelfs_rmdir, - .create = pohmelfs_create, - .lookup = pohmelfs_lookup, - .setattr = pohmelfs_setattr, - .rename = pohmelfs_rename, -}; |