3.16.57-rc1 review patch. If anyone has any objections, please let me know.
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From: "J. Bruce Fields" bfields@redhat.com
commit 1b8d97b0a837beaf48a8449955b52c650a7114b4 upstream.
If some of the WRITE calls making up an O_DIRECT write syscall fail, we neglect to commit, even if some of the WRITEs succeed.
We also depend on the commit code to free the reference count on the nfs_page taken in the "if (request_commit)" case at the end of nfs_direct_write_completion(). The problem was originally noticed because ENOSPC's encountered partway through a write would result in a closed file being sillyrenamed when it should have been unlinked.
Signed-off-by: J. Bruce Fields bfields@redhat.com Signed-off-by: Trond Myklebust trond.myklebust@primarydata.com [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- fs/nfs/direct.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
--- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -732,10 +732,8 @@ static void nfs_direct_write_completion(
spin_lock(&dreq->lock);
- if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) { - dreq->flags = 0; + if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) dreq->error = hdr->error; - } if (dreq->error != 0) bit = NFS_IOHDR_ERROR; else {