[PATCH v2 0/2] fs: btrfs: add support for readdir

Btrfs in U-boot currently uses a custom callback for ls and doesn't expose
the standard opendir/readdir/closedir interface, making it harder to use
in generic code. One area where this would be useful is in discovering BLS
type 1 entries [1] on a Btrfs filesystem.

Add support for the standard interface, and implement ls in terms of it.

[1] https://lore.kernel.org/u-boot/[email protected]/

Signed-off-by: Alexey Charkov <[email protected]>
---
Changes in v2:
- Cache subvolume id and inode number instead of looking them up on every
  readdir call (thanks Qu)
- Split out the dirent type conversion between btrfs and U-Boot filesystem
  convention into a helper function (thanks Qu)
- Drop redundant check for XATTR entries in btrfs_next_dir_entry (thanks Qu)
- Remove btrfs_ls and show_dir which nothing calls after the second patch
- Use container_of instead of type-casting struct pointers
- Link to v1: https://patch.msgid.link/[email protected]

To: Qu Wenruo <[email protected]>
To: [email protected]
To: [email protected]
Cc: Marek Behún <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Alexey Charkov <[email protected]>
Cc: Peng Fan <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Timo tp Preißl <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: Yao Zi <[email protected]>

---
Alexey Charkov (2):
      fs: btrfs: implement opendir(), readdir() and closedir()
      fs: btrfs: use fs_ls_generic() and drop custom implementation

 fs/btrfs/btrfs.c    | 199 ++++++++++++++++++++++------------------------------
 fs/btrfs/ctree.h    |   7 +-
 fs/btrfs/dir-item.c |  76 ++++++++++++--------
 fs/fs.c             |   6 +-
 include/btrfs.h     |   6 +-
 5 files changed, 143 insertions(+), 151 deletions(-)
---
base-commit: 19eafbadf20f56c1a24abe6b5e8774e776894261
change-id: 20260625-btrfs-readdir-8beac3ac5220

Best regards,
--  
Alexey Charkov <[email protected]>