diff options
| author | Scott Mayhew <smayhew@redhat.com> | 2014-06-20 08:44:42 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-07-06 18:59:11 -0700 |
| commit | 716f02ac00a77c14cdf18de2e75e49e68e46e1e8 (patch) | |
| tree | 1a602f0986a7af993f021b2cee4079996abd5539 /fs | |
| parent | ff177fb44d47f46567543127e3ad42936b31c71f (diff) | |
nfs: Fix cache_validity check in nfs_write_pageuptodate()
commit 18dd78c427513fb0f89365138be66e6ee8700d1b upstream.
NFS_INO_INVALID_DATA cannot be ignored, even if we have a delegation.
We're still having some problems with data corruption when multiple
clients are appending to a file and those clients are being granted
write delegations on open.
To reproduce:
Client A:
vi /mnt/`hostname -s`
while :; do echo "XXXXXXXXXXXXXXX" >>/mnt/file; sleep $(( $RANDOM % 5 )); done
Client B:
vi /mnt/`hostname -s`
while :; do echo "YYYYYYYYYYYYYYY" >>/mnt/file; sleep $(( $RANDOM % 5 )); done
What's happening is that in nfs_update_inode() we're recognizing that
the file size has changed and we're setting NFS_INO_INVALID_DATA
accordingly, but then we ignore the cache_validity flags in
nfs_write_pageuptodate() because we have a delegation. As a result,
in nfs_updatepage() we're extending the write to cover the full page
even though we've not read in the data to begin with.
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/write.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 9a3b6a4cd6b9..aaa16b31e21e 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -913,12 +913,14 @@ static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) if (nfs_have_delegated_attributes(inode)) goto out; - if (nfsi->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE)) + if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) return false; smp_rmb(); if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) return false; out: + if (nfsi->cache_validity & NFS_INO_INVALID_DATA) + return false; return PageUptodate(page) != 0; } |