[PATCH v2 0/2] open: make RESOLVE_CACHED correctly test for O_TMPFILE

[Aleksa Sarai]

There were a few places that were incorrectly testing for whether an
open(2) operation was O_TMPFILE by doing (flags & O_TMPFILE). As
O_TMPFILE is defined as __O_TMPFILE|O_DIRECTORY, this would cause the
code to assume that O_DIRECTORY is equivalent to O_TMPFILE.

The only places where this happened were in RESOLVE_CACHED and
io_uring's checking related to RESOLVE_CACHED, so the only bug this
really fixes is that now O_DIRECTORY will no longer cause RESOLVE_CACHED
to always fail with -EAGAIN (and io_uring will thus be faster when doing
O_DIRECTORY opens).

Signed-off-by: Aleksa Sarai <cyphar@xxxxxxxxxx>
---
Changes in v2:
- fix io_uring's io_openat_force_async as well.
- v1: <https://lore.kernel.org/r/20230806-resolve_cached-o_tmpfile-v1-1-7ba16308465e@xxxxxxxxxx>

---
Aleksa Sarai (2):
      open: make RESOLVE_CACHED correctly test for O_TMPFILE
      io_uring: correct check for O_TMPFILE

 fs/open.c            | 2 +-
 io_uring/openclose.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
base-commit: bf5ad7af0516cb47121dae1b1c160e4385615274
change-id: 20230806-resolve_cached-o_tmpfile-978cb238bd68

Best regards,
-- 
Aleksa Sarai <cyphar@xxxxxxxxxx>