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fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and btrfs_size()

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After this the only remaining function that still utilizes
__btrfs_lookup_path() is btrfs_read().

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
This commit is contained in:
Qu Wenruo 2020-06-24 18:03:07 +02:00 committed by Tom Rini
parent 325dd1f642
commit 5bbb68d5f0
1 changed files with 48 additions and 17 deletions
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65
fs/btrfs/btrfs.c
View file

@ -188,37 +188,66 @@ int btrfs_ls(const char *path)
int btrfs_exists(const char *file)
{
struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
struct btrfs_fs_info *fs_info = current_fs_info;
struct btrfs_root *root;
u64 ino;
u8 type;
int ret;
inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
ASSERT(fs_info);
return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
file, &root, &ino, &type, 40);
if (ret < 0)
return 0;
if (type == BTRFS_FT_REG_FILE)
return 1;
return 0;
}
int btrfs_size(const char *file, loff_t *size)
{
struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr;
struct btrfs_fs_info *fs_info = current_fs_info;
struct btrfs_inode_item *ii;
struct btrfs_root *root;
struct btrfs_path path;
struct btrfs_key key;
u64 ino;
u8 type;
int ret;
inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
file, &root, &ino, &type, 40);
if (ret < 0) {
printf("Cannot lookup file %s\n", file);
return -1;
return ret;
}
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
return -1;
return -ENOENT;
}
btrfs_init_path(&path);
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
*size = inode.size;
return 0;
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0) {
printf("Cannot lookup ino %llu\n", ino);
return ret;
}
if (ret > 0) {
printf("Ino %llu does not exist\n", ino);
ret = -ENOENT;
goto out;
}
ii = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_inode_item);
*size = btrfs_inode_size(path.nodes[0], ii);
out:
btrfs_release_path(&path);
return ret;
}
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
@ -270,7 +299,9 @@ void btrfs_close(void)
int btrfs_uuid(char *uuid_str)
{
#ifdef CONFIG_LIB_UUID
uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD);
if (current_fs_info)
uuid_bin_to_str(current_fs_info->super_copy->fsid, uuid_str,
UUID_STR_FORMAT_STD);
return 0;
#endif
return -ENOSYS;