[v18,0/7] Case insensitive cleanup for ext4/f2fs

Hello,

I am trying to respin the series here :
https://www.spinics.net/lists/linux-ext4/msg85081.html

I resent some of the v9 patches and got some reviews from Gabriel,
I did changes as requested and here is v18.

Changes in v18:
- in patch 2/7 removed the check for folded_name->len
- in patch 4/7 simplified the use of generic_ci_match

Changes in v17:
- in patch 2/7 the case insensitive match helper, I modified the logic a bit,
memcmp params, and return errors properly, also removed patches for logging
errors as the message is now included in the helper itself.

Changes in v16:
- rewrote patch 2/9 without `match`
- changed to return value in generic_ci_match coming from utf8 compare only in
strict mode.
- changed f2fs_warn to *_ratelimited in 7/9
- removed the declaration of f2fs_cf_name_slab in recovery.c as it's no longer
needed.

Changes in v15:
- fix wrong check `ret<0` in 7/9
- fix memleak reintroduced in 8/9

Changes in v14:
- fix wrong kfree unchecked call
- changed the return code in 3/8

Changes in v13:
- removed stray wrong line in 2/8
- removed old R-b as it's too long since they were given
- removed check for null buff in 2/8
- added new patch `f2fs: Log error when lookup of encoded dentry fails` as suggested
- rebased on unicode.git for-next branch

Changes in v12:
- revert to v10 comparison with propagating the error code from utf comparison

Changes in v11:
- revert to the original v9 implementation for the comparison helper.

Changes in v10:
- reworked a bit the comparison helper to improve performance by
first performing the exact lookup.


* Original commit letter

The case-insensitive implementations in f2fs and ext4 have quite a bit
of duplicated code.  This series simplifies the ext4 version, with the
goal of extracting ext4_ci_compare into a helper library that can be
used by both filesystems.  It also reduces the clutter from many
codeguards for CONFIG_UNICODE; as requested by Linus, they are part of
the codeflow now.

While there, I noticed we can leverage the utf8 functions to detect
encoded names that are corrupted in the filesystem. Therefore, it also
adds an ext4 error on that scenario, to mark the filesystem as
corrupted.

This series survived passes of xfstests -g quick.

Gabriel Krisman Bertazi (7):
  ext4: Simplify the handling of cached casefolded names
  f2fs: Simplify the handling of cached casefolded names
  libfs: Introduce case-insensitive string comparison helper
  ext4: Reuse generic_ci_match for ci comparisons
  f2fs: Reuse generic_ci_match for ci comparisons
  ext4: Move CONFIG_UNICODE defguards into the code flow
  f2fs: Move CONFIG_UNICODE defguards into the code flow

 fs/ext4/crypto.c   |  10 +---
 fs/ext4/ext4.h     |  35 ++++++++-----
 fs/ext4/namei.c    | 122 ++++++++++++++-------------------------------
 fs/ext4/super.c    |   4 +-
 fs/f2fs/dir.c      | 105 ++++++++++++--------------------------
 fs/f2fs/f2fs.h     |  16 +++++-
 fs/f2fs/namei.c    |  10 ++--
 fs/f2fs/recovery.c |   9 +---
 fs/f2fs/super.c    |   8 +--
 fs/libfs.c         |  74 +++++++++++++++++++++++++++
 include/linux/fs.h |   4 ++
 11 files changed, 195 insertions(+), 202 deletions(-)

Eugen Hristev <eugen.hristev@collabora.com> writes:

> Hello,
>
> I am trying to respin the series here :
> https://www.spinics.net/lists/linux-ext4/msg85081.html
>
> I resent some of the v9 patches and got some reviews from Gabriel,
> I did changes as requested and here is v18.

The patchset looks good to me.  Feel free to add:

Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>

Bringing Christian into the loop, since this is getting ready and it
should go through the VFS tree, as it touches libfs and a couple
filesystems.

Christian, can you please take a look? Eric has also been involved in
the review, so we should give him a few days to see if he has more
comments.

On Thu, 06 Jun 2024 10:33:46 +0300, Eugen Hristev wrote:
> I am trying to respin the series here :
> https://www.spinics.net/lists/linux-ext4/msg85081.html
> 
> I resent some of the v9 patches and got some reviews from Gabriel,
> I did changes as requested and here is v18.
> 
> Changes in v18:
> - in patch 2/7 removed the check for folded_name->len
> - in patch 4/7 simplified the use of generic_ci_match
> 
> [...]

Applied to the vfs.casefold branch of the vfs/vfs.git tree.
Patches in the vfs.casefold branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.casefold

[1/7] ext4: Simplify the handling of cached casefolded names
      https://git.kernel.org/vfs/vfs/c/f776f02a2c96
[2/7] f2fs: Simplify the handling of cached casefolded names
      https://git.kernel.org/vfs/vfs/c/632f4054b229
[3/7] libfs: Introduce case-insensitive string comparison helper
      https://git.kernel.org/vfs/vfs/c/6a79a4e187bd
[4/7] ext4: Reuse generic_ci_match for ci comparisons
      https://git.kernel.org/vfs/vfs/c/d76b92f61f3b
[5/7] f2fs: Reuse generic_ci_match for ci comparisons
      https://git.kernel.org/vfs/vfs/c/d66858eb0c72
[6/7] ext4: Move CONFIG_UNICODE defguards into the code flow
      https://git.kernel.org/vfs/vfs/c/d98c822232f8
[7/7] f2fs: Move CONFIG_UNICODE defguards into the code flow
      https://git.kernel.org/vfs/vfs/c/28add38d545f

> Christian, can you please take a look? Eric has also been involved in

Thanks! Looks good to me. I've picked it up for testing in -next.

Hello:

This series was applied to jaegeuk/f2fs.git (dev)
by Christian Brauner <brauner@kernel.org>:

On Thu,  6 Jun 2024 10:33:46 +0300 you wrote:
> Hello,
> 
> I am trying to respin the series here :
> https://www.spinics.net/lists/linux-ext4/msg85081.html
> 
> I resent some of the v9 patches and got some reviews from Gabriel,
> I did changes as requested and here is v18.
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,v18,1/7] ext4: Simplify the handling of cached casefolded names
    https://git.kernel.org/jaegeuk/f2fs/c/f776f02a2c96
  - [f2fs-dev,v18,2/7] f2fs: Simplify the handling of cached casefolded names
    https://git.kernel.org/jaegeuk/f2fs/c/632f4054b229
  - [f2fs-dev,v18,3/7] libfs: Introduce case-insensitive string comparison helper
    https://git.kernel.org/jaegeuk/f2fs/c/6a79a4e187bd
  - [f2fs-dev,v18,4/7] ext4: Reuse generic_ci_match for ci comparisons
    https://git.kernel.org/jaegeuk/f2fs/c/d76b92f61f3b
  - [f2fs-dev,v18,5/7] f2fs: Reuse generic_ci_match for ci comparisons
    https://git.kernel.org/jaegeuk/f2fs/c/d66858eb0c72
  - [f2fs-dev,v18,6/7] ext4: Move CONFIG_UNICODE defguards into the code flow
    https://git.kernel.org/jaegeuk/f2fs/c/d98c822232f8
  - [f2fs-dev,v18,7/7] f2fs: Move CONFIG_UNICODE defguards into the code flow
    https://git.kernel.org/jaegeuk/f2fs/c/28add38d545f

You are awesome, thank you!