NFSD: Fix possible sleep during nfsd4_release_lockowner()

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nfsd4_release_lockowner() holds clp->cl_lock when it calls
check_for_locks(). However, check_for_locks() calls nfsd_file_get()
/ nfsd_file_put() to access the backing inode's flc_posix list, and
nfsd_file_put() can sleep if the inode was recently removed.

Let's instead rely on the stateowner's reference count to gate
whether the release is permitted. This should be a reliable
indication of locks-in-use since file lock operations and
->lm_get_owner take appropriate references, which are released
appropriately when file locks are removed.

Reported-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org

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This commit is contained in:

Chuck Lever 2022-05-21 19:06:13 -04:00

parent fd5e363eac

commit ce3c4ad7f4

1 changed files with 4 additions and 8 deletions

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12

fs/nfsd/nfs4state.c

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