[PATCH 0/3] Data in direntry (dirdata) feature

[Artem Blagodarenko <artem.blagodarenko@gmail.com>]

EXT4 currently stores a hash in the directory entry
(dirent) immediately after the file name to support
simultaneous fscrypt and casefold functionality.

It has been discussed within the EXT4 community that
this hash could instead be stored in dirdata. This
would make it the second (or third, in the case of
64-bit inode counts) user of dirdata.

At the same time, the existing format—where the hash
is placed after the file name—must continue to be
supported. With these patches, EXT4 can handle the
hash in both formats.

The first user of this feature, LUFID, has been
tested in the Lustre filesystem backend (LDISKFS)
[1].

Support for fscrypt and case-insensitive directories
with dirdata enabled has been verified using a
dedicated xfstest submitted to the EXT4 community as
a separate patch.

e2fsprogs support is provided in a separate patch.

[1] https://review.whamcloud.com/c/fs/lustre-release/+/64439

Artem Blagodarenko (3):
  ext4: make dirdata work with metadata_csum
  ext4: add dirdata support structures and helpers
  ext4: dirdata feature

 fs/ext4/dir.c    |   9 +-
 fs/ext4/ext4.h   | 169 +++++++++++++++++++--
 fs/ext4/inline.c |  22 +--
 fs/ext4/namei.c  | 379 ++++++++++++++++++++++++++++++-----------------
 fs/ext4/super.c  |   4 +-
 fs/ext4/sysfs.c  |   2 +
 6 files changed, 422 insertions(+), 163 deletions(-)

-- 
2.43.5