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| author | J. Bruce Fields <bfields@redhat.com> | 2011-09-28 05:42:29 +0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2011-10-11 02:04:45 +0400 |
| commit | 71c3bcd71393a9e67d5b77597a612537f89c30ed (patch) | |
| tree | bb47b74ebf2b0477c5c74449aae241003dbe9e8d | |
| parent | 38c2f4b12a455cb3a108fd5c79a10df2ba3ec9a7 (diff) | |
| download | linux-71c3bcd71393a9e67d5b77597a612537f89c30ed.tar.xz | |
nfsd4: fix state lock usage in LOCKU
In commit 5ec094c1096ab3bb795651855d53f18daa26afde "nfsd4: extend state
lock over seqid replay logic" I modified the exit logic of all the
seqid-based procedures except nfsd4_locku(). Fix the oversight.
The result of the bug was a double-unlock while handling the LOCKU
procedure, and a warning like:
[ 142.150014] WARNING: at kernel/mutex-debug.c:78 debug_mutex_unlock+0xda/0xe0()
...
[ 142.152927] Pid: 742, comm: nfsd Not tainted 3.1.0-rc1-SLIM+ #9
[ 142.152927] Call Trace:
[ 142.152927] [<ffffffff8105fa4f>] warn_slowpath_common+0x7f/0xc0
[ 142.152927] [<ffffffff8105faaa>] warn_slowpath_null+0x1a/0x20
[ 142.152927] [<ffffffff810960ca>] debug_mutex_unlock+0xda/0xe0
[ 142.152927] [<ffffffff813e4200>] __mutex_unlock_slowpath+0x80/0x140
[ 142.152927] [<ffffffff813e42ce>] mutex_unlock+0xe/0x10
[ 142.152927] [<ffffffffa03bd3f5>] nfs4_lock_state+0x35/0x40 [nfsd]
[ 142.152927] [<ffffffffa03b0b71>] nfsd4_proc_compound+0x2a1/0x690
[nfsd]
[ 142.152927] [<ffffffffa039f9fb>] nfsd_dispatch+0xeb/0x230 [nfsd]
[ 142.152927] [<ffffffffa02b1055>] svc_process_common+0x345/0x690
[sunrpc]
[ 142.152927] [<ffffffff81058d10>] ? try_to_wake_up+0x280/0x280
[ 142.152927] [<ffffffffa02b16e2>] svc_process+0x102/0x150 [sunrpc]
[ 142.152927] [<ffffffffa039f0bd>] nfsd+0xbd/0x160 [nfsd]
[ 142.152927] [<ffffffffa039f000>] ? 0xffffffffa039efff
[ 142.152927] [<ffffffff8108230c>] kthread+0x8c/0xa0
[ 142.152927] [<ffffffff813e8694>] kernel_thread_helper+0x4/0x10
[ 142.152927] [<ffffffff81082280>] ? kthread_worker_fn+0x190/0x190
[ 142.152927] [<ffffffff813e8690>] ? gs_change+0x13/0x13
Reported-by: Bryan Schumaker <bjschuma@netapp.com>
Tested-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| -rw-r--r-- | fs/nfsd/nfs4state.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 931155f51ecc..8e253a347649 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -4185,7 +4185,8 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t)); out: - nfs4_unlock_state(); + if (!cstate->replay_owner) + nfs4_unlock_state(); return status; out_nfserr: |