NFSv4.1: Fix a race in pNFS layoutcommit

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We need to clear the NFS_LSEG_LAYOUTCOMMIT bits atomically with the
NFS_INO_LAYOUTCOMMIT bit, otherwise we may end up with situations
where the two are out of sync.
The first half of the problem is to ensure that pnfs_layoutcommit_inode
clears the NFS_LSEG_LAYOUTCOMMIT bit through pnfs_list_write_lseg.
We still need to keep the reference to those segments until the RPC call
is finished, so in order to make it clear _where_ those references come
from, we add a helper pnfs_list_write_lseg_done() that cleans up after
pnfs_list_write_lseg.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Benny Halevy <bhalevy@tonian.com>
Cc: stable@vger.kernel.org

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This commit is contained in:

Trond Myklebust 2013-03-20 12:34:32 -04:00

parent 4376c94618

commit a073dbff35

2 changed files with 18 additions and 15 deletions

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14

fs/nfs/nfs4proc.c

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19

fs/nfs/pnfs.c

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