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filelock: fix deadlock detection in POSIX locking

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The FL_POSIX check in __locks_insert_block was inadvertantly broken
recently and is now inserting only OFD locks instead of only legacy
POSIX locks.

This breaks deadlock detection in POSIX locks, and may also be the root
cause of a performance regression noted by the kernel test robot.
Restore the proper sense of the test.

Fixes: b6be371400 ("filelock: convert __locks_insert_block, conflict and deadlock checks to use file_lock_core")
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202402181229.f8147f40-oliver.sang@intel.com
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20240218-flsplit4-v1-1-26454fc090f2@kernel.org
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jeff Layton 2024-02-18 08:33:28 -05:00 committed by Christian Brauner
parent 582a3bf999
commit 14786d949a
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1 changed files with 1 additions and 1 deletions
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fs/locks.c
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@ -812,7 +812,7 @@ new_blocker:
list_add_tail(&waiter->flc_blocked_member,
&blocker->flc_blocked_requests);
if ((blocker->flc_flags & (FL_POSIX|FL_OFDLCK)) == (FL_POSIX|FL_OFDLCK))
if ((blocker->flc_flags & (FL_POSIX|FL_OFDLCK)) == FL_POSIX)
locks_insert_global_blocked(waiter);
/* The requests in waiter->flc_blocked are known to conflict with