[PATCH] cifs: Gracefully turn off serverino (when serverino is enabled on mount)

Old servers such as NT4 do not support this level of FindFirst (and
retry with a lower infolevel)

Signed-off-by: Steve French (sfrench@us.ibm.com)
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 7 insertions, 1 deletions

diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index 4e34c89cec5d..dfaabc8d8fb6 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -206,7 +206,7 @@ static const struct {
         {
         ERRDOS, ERRgeneral, NT_STATUS_UNSUCCESSFUL}, {
         ERRDOS, ERRbadfunc, NT_STATUS_NOT_IMPLEMENTED}, {
-        ERRDOS, 87, NT_STATUS_INVALID_INFO_CLASS}, {
+        ERRDOS, ERRinvlevel, NT_STATUS_INVALID_INFO_CLASS}, {
         ERRDOS, 24, NT_STATUS_INFO_LENGTH_MISMATCH}, {
         ERRHRD, ERRgeneral, NT_STATUS_ACCESS_VIOLATION}, {
         ERRHRD, ERRgeneral, NT_STATUS_IN_PAGE_ERROR}, {
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index f8bea395ec9e..07838a5ba3a1 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -323,6 +323,7 @@ static int initiate_cifs_search(const int xid, struct file *file)
 
         cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
 
+ffirst_retry:
         /* test for Unix extensions */
         if (pTcon->ses->capabilities & CAP_UNIX) {
                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 
@@ -336,6 +337,11 @@ static int initiate_cifs_search(const int xid, struct file *file)
                 &cifsFile->netfid, &cifsFile->srch_inf); 
         if(rc == 0)
                 cifsFile->invalidHandle = FALSE;
+        if((rc == -EOPNOTSUPP) && 
+                (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+                cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
+                goto ffirst_retry;
+        }
         kfree(full_path);
         return rc;
 }