diff options
| author | Jeff Layton <jlayton@redhat.com> | 2014-01-28 13:47:46 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2014-01-28 14:48:18 -0500 |
| commit | 4db72b40fdbc706f8957e9773ae73b1574b8c694 (patch) | |
| tree | 7ccf6324c0643b0b35c1ccc0895292f51000685e /fs/nfs/write.c | |
| parent | 17dfeb9113397a6119091a491ef7182649f0c5a9 (diff) | |
nfs: add memory barriers around NFS_INO_INVALID_DATA and NFS_INO_INVALIDATING
If the setting of NFS_INO_INVALIDATING gets reordered to before the
clearing of NFS_INO_INVALID_DATA, then another task may hit a race
window where both appear to be clear, even though the inode's pages are
still in need of invalidation. Fix this by adding the appropriate memory
barriers.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/write.c')
| -rw-r--r-- | fs/nfs/write.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 5511a4247190..9a3b6a4cd6b9 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -915,6 +915,7 @@ static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) goto out; if (nfsi->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE)) return false; + smp_rmb(); if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) return false; out: |