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btrfs-progs: Add btrfs_mkdir() function for the incoming 'lost+found' fsck mechanism.

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With the previous btrfs inode operations patches, now we can use
btrfs_mkdir() to create the 'lost+found' dir to do some data salvage in
btrfsck.

This patch along with previous ones will make data salvage easier.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2014-12-09 16:27:26 +08:00 committed by David Sterba
parent 0cc75eddd0
commit 43c36f3cfd
2 changed files with 104 additions and 0 deletions

2
ctree.h
View File

@ -2454,4 +2454,6 @@ int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u64 ino);
int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
char *name, int namelen, u64 parent_ino, u64 *ino, int mode);
#endif

102
inode.c
View File

@ -431,3 +431,105 @@ out:
btrfs_free_path(path);
return ret;
}
/* Fill inode item with 'mode'. Uid/gid to root/root */
static void fill_inode_item(struct btrfs_trans_handle *trans,
struct btrfs_inode_item *inode_item,
u32 mode, u32 nlink)
{
time_t now = time(NULL);
btrfs_set_stack_inode_generation(inode_item, trans->transid);
btrfs_set_stack_inode_uid(inode_item, 0);
btrfs_set_stack_inode_gid(inode_item, 0);
btrfs_set_stack_inode_size(inode_item, 0);
btrfs_set_stack_inode_mode(inode_item, mode);
btrfs_set_stack_inode_nlink(inode_item, nlink);
btrfs_set_stack_timespec_sec(&inode_item->atime, now);
btrfs_set_stack_timespec_nsec(&inode_item->atime, 0);
btrfs_set_stack_timespec_sec(&inode_item->mtime, now);
btrfs_set_stack_timespec_nsec(&inode_item->mtime, 0);
btrfs_set_stack_timespec_sec(&inode_item->ctime, now);
btrfs_set_stack_timespec_nsec(&inode_item->ctime, 0);
}
/*
* Unlike kernel btrfs_new_inode(), we only create the INODE_ITEM, without
* its backref.
* The backref is added by btrfs_add_link().
*/
static int btrfs_new_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 ino, u32 mode)
{
struct btrfs_inode_item inode_item = {0};
int ret = 0;
fill_inode_item(trans, &inode_item, mode, 0);
ret = btrfs_insert_inode(trans, root, ino, &inode_item);
return ret;
}
/*
* Make a dir under the parent inode 'parent_ino' with 'name'
* and 'mode', The owner will be root/root.
*/
int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
char *name, int namelen, u64 parent_ino, u64 *ino, int mode)
{
struct btrfs_dir_item *dir_item;
struct btrfs_path *path;
u64 ret_ino = 0;
int ret = 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
if (ino && *ino)
ret_ino = *ino;
dir_item = btrfs_lookup_dir_item(NULL, root, path, parent_ino,
name, namelen, 0);
if (IS_ERR(dir_item)) {
ret = PTR_ERR(dir_item);
goto out;
}
if (dir_item) {
struct btrfs_key found_key;
/*
* Already have conflicting name, check if it is a dir.
* Either way, no need to continue.
*/
btrfs_dir_item_key_to_cpu(path->nodes[0], dir_item, &found_key);
ret_ino = found_key.objectid;
if (btrfs_dir_type(path->nodes[0], dir_item) != BTRFS_FT_DIR)
ret = -EEXIST;
goto out;
}
if (!ret_ino)
/*
* This is *UNSAFE* if some leaf is corrupted,
* only used as a fallback method. Caller should either
* ensure the fs is OK or pass ino with unused inode number.
*/
ret = btrfs_find_free_objectid(NULL, root, parent_ino,
&ret_ino);
if (ret)
goto out;
ret = btrfs_new_inode(trans, root, ret_ino, mode | S_IFDIR);
if (ret)
goto out;
ret = btrfs_add_link(trans, root, ret_ino, parent_ino, name, namelen,
BTRFS_FT_DIR, NULL, 1);
if (ret)
goto out;
out:
btrfs_free_path(path);
if (ret == 0 && ino)
*ino = ret_ino;
return ret;
}