[PATCH U-BOOT 20/26] fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and btrfs_size()

Qu Wenruo
2020-04-22T06:50:03Z

The remaining function that still utilize __btrfs_lookup_path() is
btrfs_read().

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 65 +++++++++++++++++++++++++++++++++++-------------
fs/btrfs/inode.c | 1 -
2 files changed, 48 insertions(+), 18 deletions(-)

diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index e7c7ddcfc551..8d1dee2f73c4 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -186,37 +186,66 @@ 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;
+
+ ASSERT(fs_info);

- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0)
+ return 0;

- return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
+ 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,
@@ -268,7 +297,9 @@ 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;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index af4f30bbd50c..ff411d5251e9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -404,7 +404,6 @@ int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
}

while (*cur != '\0') {
-
cur = skip_current_directories(cur);
len = next_length(cur);
if (len > BTRFS_NAME_LEN) {
--
2.26.0