cifs: fallback to older infolevels on findfirst queryinfo retry

BugLink: https://bugs.launchpad.net/bugs/1828420

[ Upstream commit 3b7960ca ]

In cases where queryinfo fails, we have cases in cifs (vers=1.0)
where with backupuid mounts we retry the query info with findfirst.
This doesn't work to some NetApp servers which don't support
WindowsXP (and later) infolevel 261 (SMB_FIND_FILE_ID_FULL_DIR_INFO)
so in this case use other info levels (in this case it will usually
be level 257, SMB_FIND_FILE_DIRECTORY_INFO).

(Also fixes some indentation)

See kernel bugzilla 201435
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

fs/cifs/inode.c

@@ -773,7 +773,15 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
 		}
 
 		srchinf->endOfSearch = false;
+		if (tcon->unix_ext)
+			srchinf->info_level = SMB_FIND_FILE_UNIX;
+		else if ((tcon->ses->capabilities &
+			 tcon->ses->server->vals->cap_nt_find) == 0)
+			srchinf->info_level = SMB_FIND_FILE_INFO_STANDARD;
+		else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 			srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
+		else /* no srvino useful for fallback to some netapp */
+			srchinf->info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 
 		srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
 				CIFS_SEARCH_CLOSE_AT_END |
@@ -782,8 +790,7 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
 		rc = CIFSFindFirst(xid, tcon, full_path,
 			cifs_sb, NULL, srchflgs, srchinf, false);
 		if (!rc) {
-				data =
-				(FILE_ALL_INFO *)srchinf->srch_entries_start;
+			data = (FILE_ALL_INFO *)srchinf->srch_entries_start;
 
 			cifs_dir_info_to_fattr(&fattr,
 			(FILE_DIRECTORY_INFO *)data, cifs_sb);