NFSv4 do not send an empty SETATTR compound
Commit 536e43d12b9517bbbf6114cd1a12be27857a4d7a ATTR_OPEN check can result in
an ia_valid with only ATTR_FILE set, and no NFS_VALID_ATTRS attributes to
request from the server.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f23977e..15fc7e4 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2549,6 +2549,14 @@
nfs_fattr_init(fattr);
+ /* Deal with open(O_TRUNC) */
+ if (sattr->ia_valid & ATTR_OPEN)
+ sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
+
+ /* Optimization: if the end result is no change, don't RPC */
+ if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
+ return 0;
+
/* Search for an existing open(O_WRITE) file */
if (sattr->ia_valid & ATTR_FILE) {
struct nfs_open_context *ctx;
@@ -2560,10 +2568,6 @@
}
}
- /* Deal with open(O_TRUNC) */
- if (sattr->ia_valid & ATTR_OPEN)
- sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
-
status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
if (status == 0)
nfs_setattr_update_inode(inode, sattr);