tree b4133627b503563eadea21aab695df78080402e1
parent 795a88c968eef031f370973512b42124bacb2f17
author Trond Myklebust <Trond.Myklebust@netapp.com> 1347393682 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1348862585 -0400

NFS: Fix fdatasync/fsync() when confronted with a server reboot

If the server reboots before it can commit the unstable writes to disk,
then nfs_commit_release_pages() will detect this when it compares the
verifier returned by COMMIT to the one returned by WRITE. When this
happens, the client needs to resend those writes in order to guarantee
that they make it to stable storage.

This patch adds a signalling mechanism to notify fsync() that it
needs to retry all writes before it can exit.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>