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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-08-08 22:03:13 +0200 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-08-08 22:03:13 +0200 |
| commit | 47fbf7976e0b7d9dcdd799e2a1baba19064d9631 (patch) | |
| tree | 1d2a0b4d69f331f5f0d82f15be9a1f06b3d80aa1 /fs | |
| parent | pnfs-obj: Better IO pattern in case of unaligned offset (diff) | |
| download | linux-47fbf7976e0b7d9dcdd799e2a1baba19064d9631.tar.xz linux-47fbf7976e0b7d9dcdd799e2a1baba19064d9631.zip | |
NFSv4.1: Remove a bogus BUG_ON() in nfs4_layoutreturn_done
Ever since commit 0a57cdac3f (NFSv4.1 send layoutreturn to fence
disconnected data server) we've been sending layoutreturn calls
while there is potentially still outstanding I/O to the data
servers. The reason we do this is to avoid races between replayed
writes to the MDS and the original writes to the DS.
When this happens, the BUG_ON() in nfs4_layoutreturn_done can
be triggered because it assumes that we would never call
layoutreturn without knowing that all I/O to the DS is
finished. The fix is to remove the BUG_ON() now that the
assumptions behind the test are obsolete.
Reported-by: Boaz Harrosh <bharrosh@panasas.com>
Reported-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org [>=3.5]
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/nfs4proc.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index f94f6b3928fc..c77d296bdaa6 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6359,12 +6359,8 @@ static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) return; } spin_lock(&lo->plh_inode->i_lock); - if (task->tk_status == 0) { - if (lrp->res.lrs_present) { - pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); - } else - BUG_ON(!list_empty(&lo->plh_segs)); - } + if (task->tk_status == 0 && lrp->res.lrs_present) + pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); lo->plh_block_lgets--; spin_unlock(&lo->plh_inode->i_lock); dprintk("<-- %s\n", __func__); |