[PATCH 0/7] namei: clean up retry logic in various do_* functions

[Dmitry Kadashev <dkadashev@gmail.com>]

Suggested by Linus in https://lore.kernel.org/io-uring/CAHk-=wh=cpt_tQCirzFZRPawRpbuFTZ2MxNpXiyUF+eBXF=+sw@mail.gmail.com/

This patchset does all the do_* functions one by one. The idea is to
move the main logic to a helper function and handle stale retries /
struct filename cleanups outside, which makes the logic easier to
follow.

There is one minor change in the behavior: filename_lookup() /
filename_parentat() / filename_create() do their own retries on ESTALE
(regardless of flags), and previously they were exempt from retries in
the do_* functions (but they *were* called on retry - it's just the
return code wasn't checked for ESTALE). And now the retry is done on
the upper level, and so technically it could be called a behavior
change. Hopefully it's an edge case where an additional check does not
matter.

On top of https://lore.kernel.org/io-uring/20210708063447.3556403-1-dkadashev@gmail.com/

Dmitry Kadashev (7):
  namei: clean up do_rmdir retry logic
  namei: clean up do_unlinkat retry logic
  namei: clean up do_mkdirat retry logic
  namei: clean up do_mknodat retry logic
  namei: clean up do_symlinkat retry logic
  namei: clean up do_linkat retry logic
  namei: clean up do_renameat retry logic

 fs/namei.c | 283 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 163 insertions(+), 120 deletions(-)

-- 
2.30.2