cifs: have find_readable/writable_file filter by fsuid

When we implement multiuser mounts, we'll need to filter filehandles
by fsuid. Add a flag for multiuser mounts and code to filter by
fsuid when it's set.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index ba0afd3acff4..e04e6923d354 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -37,6 +37,7 @@
 #define CIFS_MOUNT_NOSSYNC      0x4000 /* don't do slow SMBflush on every sync*/
 #define CIFS_MOUNT_FSCACHE      0x8000 /* local caching enabled */
 #define CIFS_MOUNT_MF_SYMLINKS  0x10000 /* Minshall+French Symlinks enabled */
+#define CIFS_MOUNT_MULTIUSER    0x20000 /* multiuser mount */
 
 struct cifs_sb_info {
         struct cifsTconInfo *ptcon;     /* primary mount */
@@ -48,7 +49,7 @@ struct cifs_sb_info {
         gid_t   mnt_gid;
         mode_t  mnt_file_mode;
         mode_t  mnt_dir_mode;
-        int     mnt_cifs_flags;
+        unsigned int mnt_cifs_flags;
         int     prepathlen;
         char   *prepath; /* relative path under the share to mount to */
 #ifdef CONFIG_CIFS_DFS_UPCALL