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Btrfs: rename

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-05-23 15:44:28 -04:00 committed by David Woodhouse
parent f9f3c6b666
commit e06afa839e
4 changed files with 143 additions and 18 deletions
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1
fs/btrfs/TODO
View file

@ -8,6 +8,7 @@
* Add generation number to key pointer in nodes
* Add generation number to inode
* Add ability to switch a block group from data to metadata or vice versa
* forbid cross subvolume renames and hardlinks
* Release
* Do real tree locking
* Add extent mirroring (backup copies of blocks)

1
fs/btrfs/ctree.h
View file

@ -32,6 +32,7 @@ extern struct kmem_cache *btrfs_path_cachep;
#define BTRFS_CSUM_SIZE 32
/* four bytes for CRC32 */
#define BTRFS_CRC32_SIZE 4
#define BTRFS_EMPTY_DIR_SIZE 6
/*
* the key defines the order in the tree, and so it also defines (optimal)

27
fs/btrfs/dir-item.c
View file

@ -9,7 +9,9 @@ static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
struct btrfs_root *root,
struct btrfs_path *path,
struct btrfs_key *cpu_key,
u32 data_size)
u32 data_size,
const char *name,
int name_len)
{
int ret;
char *ptr;
@ -18,6 +20,10 @@ static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
if (ret == -EEXIST) {
struct btrfs_dir_item *di;
di = btrfs_match_dir_item_name(root, path, name, name_len);
if (di)
return ERR_PTR(-EEXIST);
ret = btrfs_extend_item(trans, root, path, data_size);
WARN_ON(ret > 0);
if (ret)
@ -37,6 +43,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_key *location, u8 type)
{
int ret = 0;
int ret2 = 0;
struct btrfs_path *path;
struct btrfs_dir_item *dir_item;
char *name_ptr;
@ -51,9 +58,12 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
path = btrfs_alloc_path();
btrfs_init_path(path);
data_size = sizeof(*dir_item) + name_len;
dir_item = insert_with_overflow(trans, root, path, &key, data_size);
dir_item = insert_with_overflow(trans, root, path, &key, data_size,
name, name_len);
if (IS_ERR(dir_item)) {
ret = PTR_ERR(dir_item);
if (ret == -EEXIST)
goto second_insert;
goto out;
}
@ -66,19 +76,20 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
btrfs_mark_buffer_dirty(path->nodes[0]);
second_insert:
/* FIXME, use some real flag for selecting the extra index */
if (root == root->fs_info->tree_root) {
ret = 0;
goto out;
}
btrfs_release_path(root, path);
btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
key.offset = location->objectid;
dir_item = insert_with_overflow(trans, root, path, &key, data_size);
dir_item = insert_with_overflow(trans, root, path, &key, data_size,
name, name_len);
if (IS_ERR(dir_item)) {
ret = PTR_ERR(dir_item);
ret2 = PTR_ERR(dir_item);
goto out;
}
btrfs_cpu_key_to_disk(&dir_item->location, location);
@ -90,7 +101,11 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_free_path(path);
return ret;
if (ret)
return ret;
if (ret2)
return ret2;
return 0;
}
struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,

132
fs/btrfs/super.c
View file

@ -375,6 +375,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_disk_key *found_key;
u32 found_type;
struct btrfs_leaf *leaf;
struct btrfs_file_extent_item *fi = NULL;
u64 extent_start = 0;
@ -386,12 +387,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
/* FIXME, add redo link to tree so we don't leak on crash */
key.objectid = inode->i_ino;
key.offset = (u64)-1;
key.flags = 0;
/*
* use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys
* or extent data
*/
btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY);
key.flags = (u32)-1;
while(1) {
btrfs_init_path(path);
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
@ -405,10 +401,13 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
reada_truncate(root, path, inode->i_ino);
leaf = btrfs_buffer_leaf(path->nodes[0]);
found_key = &leaf->items[path->slots[0]].key;
found_type = btrfs_disk_key_type(found_key);
if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
break;
if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY &&
btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY)
if (found_type != BTRFS_CSUM_ITEM_KEY &&
found_type != BTRFS_DIR_ITEM_KEY &&
found_type != BTRFS_DIR_INDEX_KEY &&
found_type != BTRFS_EXTENT_DATA_KEY)
break;
if (btrfs_disk_key_offset(found_key) < inode->i_size)
break;
@ -460,10 +459,8 @@ static void btrfs_delete_inode(struct inode *inode)
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
if (S_ISREG(inode->i_mode)) {
ret = btrfs_truncate_in_trans(trans, root, inode);
BUG_ON(ret);
}
ret = btrfs_truncate_in_trans(trans, root, inode);
BUG_ON(ret);
btrfs_free_inode(trans, root, inode);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
@ -2504,6 +2501,116 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
return 0;
}
static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
struct inode * new_dir,struct dentry *new_dentry)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(old_dir)->root;
struct inode *new_inode = new_dentry->d_inode;
struct inode *old_inode = old_dentry->d_inode;
struct timespec ctime = CURRENT_TIME;
struct btrfs_path *path;
struct btrfs_dir_item *di;
int ret;
if (S_ISDIR(old_inode->i_mode) && new_inode &&
new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
return -ENOTEMPTY;
}
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, new_dir);
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out_fail;
}
old_dentry->d_inode->i_nlink++;
old_dir->i_ctime = old_dir->i_mtime = ctime;
new_dir->i_ctime = new_dir->i_mtime = ctime;
old_inode->i_ctime = ctime;
if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
struct btrfs_key *location = &BTRFS_I(new_dir)->location;
u64 old_parent_oid;
di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
"..", 2, -1);
if (IS_ERR(di)) {
ret = PTR_ERR(di);
goto out_fail;
}
if (!di) {
ret = -ENOENT;
goto out_fail;
}
old_parent_oid = btrfs_disk_key_objectid(&di->location);
ret = btrfs_del_item(trans, root, path);
if (ret) {
ret = -EIO;
goto out_fail;
}
btrfs_release_path(root, path);
di = btrfs_lookup_dir_index_item(trans, root, path,
old_inode->i_ino,
old_parent_oid,
"..", 2, -1);
if (IS_ERR(di)) {
ret = PTR_ERR(di);
goto out_fail;
}
if (!di) {
ret = -ENOENT;
goto out_fail;
}
ret = btrfs_del_item(trans, root, path);
if (ret) {
ret = -EIO;
goto out_fail;
}
btrfs_release_path(root, path);
ret = btrfs_insert_dir_item(trans, root, "..", 2,
old_inode->i_ino, location, 0);
if (ret)
goto out_fail;
}
ret = btrfs_add_link(trans, new_dentry, old_inode);
if (ret == -EEXIST && new_inode)
ret = 0;
else if (ret)
goto out_fail;
ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
if (ret)
goto out_fail;
if (new_inode) {
new_inode->i_ctime = CURRENT_TIME;
di = btrfs_lookup_dir_index_item(trans, root, path,
new_dir->i_ino,
new_inode->i_ino,
new_dentry->d_name.name,
new_dentry->d_name.len, -1);
if (di && !IS_ERR(di)) {
btrfs_del_item(trans, root, path);
btrfs_release_path(root, path);
}
if (S_ISDIR(new_inode->i_mode))
clear_nlink(new_inode);
else
drop_nlink(new_inode);
btrfs_update_inode(trans, root, new_inode);
}
out_fail:
btrfs_free_path(path);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
return ret;
}
static struct file_system_type btrfs_fs_type = {
.owner = THIS_MODULE,
.name = "btrfs",
@ -2531,6 +2638,7 @@ static struct inode_operations btrfs_dir_inode_operations = {
.unlink = btrfs_unlink,
.mkdir = btrfs_mkdir,
.rmdir = btrfs_rmdir,
.rename = btrfs_rename,
};
static struct inode_operations btrfs_dir_ro_inode_operations = {