CIFS: Reopen the file if reconnect durable handle failed

This is a follow-on patch for 8/8 patch from the durable handles
series. It fixes the problem when durable file handle timeout
expired on the server and reopen returns -ENOENT for such files.
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index ba7eed2ee662..1dc9dea2ae70 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -681,6 +681,13 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
          * not dirty locally we could do this.
          */
         rc = server->ops->open(xid, &oparms, &oplock, NULL);
+        if (rc == -ENOENT && oparms.reconnect == false) {
+                /* durable handle timeout is expired - open the file again */
+                rc = server->ops->open(xid, &oparms, &oplock, NULL);
+                /* indicate that we need to relock the file */
+                oparms.reconnect = true;
+        }
+
         if (rc) {
                 mutex_unlock(&cfile->fh_mutex);
                 cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc);
@@ -1510,7 +1517,6 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
                 if (!rc)
                         goto out;
 
-
                 /*
                  * Windows 7 server can delay breaking lease from read to None
                  * if we set a byte-range lock on a file - break it explicitly