nfsd: assume writeable exportabled filesystems have f_sync

I don't really see how you could claim to support nfsd and not support
fsync somehow.

And in practice a quick look through the exportable filesystems suggests
the only ones without an ->fsync are read-only (efs, isofs, squashfs) or
in-memory (shmem).

Also, performing a write and then returning an error if the sync fails
(as we would do here in the wgather case) seems unhelpful to clients.

Also remove an incorrect comment.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index c120b48..ed3eb59 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1020,21 +1020,8 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
        inode = dentry->d_inode;
        exp   = fhp->fh_export;
 
-       /*
-        * Request sync writes if
-        *  -   the sync export option has been set, or
-        *  -   the client requested O_SYNC behavior (NFSv3 feature).
-        *  -   The file system doesn't support fsync().
-        * When NFSv2 gathered writes have been configured for this volume,
-        * flushing the data to disk is handled separately below.
-        */
        use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
 
-       if (!file->f_op->fsync) {/* COMMIT3 cannot work */
-              stable = 2;
-              *stablep = 2; /* FILE_SYNC */
-       }
-
        if (!EX_ISSYNC(exp))
                stable = 0;
        if (stable && !use_wgather) {