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nfsd: only set file_lock.fl_lmops in nfsd4_lockt if a stateowner is found

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nfsd4_lockt does a search for a lockstateowner when building the lock
struct to test. If one is found, it'll set fl_owner to it. Regardless of
whether that happens, it'll also set fl_lmops. Given that this lock is
basically a "lightweight" lock that's just used for checking conflicts,
setting fl_lmops is probably not appropriate for it.

This behavior exposed a bug in DLM's GETLK implementation where it
wasn't clearing out the fields in the file_lock before filling in
conflicting lock info. While we were able to fix this in DLM, it
still seems pointless and dangerous to set the fl_lmops this way
when we may have a NULL lockstateowner.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@pig.fieldses.org>
This commit is contained in:
Jeff Layton 2009-01-22 14:16:04 -05:00 committed by J. Bruce Fields
parent b914152a6f
commit fa82a49127
1 changed files with 0 additions and 1 deletions
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fs/nfsd/nfs4state.c
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@ -2871,7 +2871,6 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
file_lock.fl_pid = current->tgid;
file_lock.fl_flags = FL_POSIX;
file_lock.fl_lmops = &nfsd_posix_mng_ops;
file_lock.fl_start = lockt->lt_offset;
file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);