[CIFS] CIFS should honour umask

This patch makes CIFS honour a process' umask like other filesystems.
Of course the server is still free to munge the permissions if it wants
to; but the client will send the "right" permissions to begin with.

A few caveats:

1) It only applies to filesystems that have CAP_UNIX (aka support unix
extensions)
2) It applies the correct mode to the follow up CIFSSMBUnixSetPerms()
after remote creation

When mode to CIFS/NTFS ACL mapping is complete we can do the
same thing for that case for servers which do not
support the Unix Extensions.

Signed-off-by: Matt Keenen <matt@opcode-solutions.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index f085db965788..8e86aaceb68a 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -208,7 +208,8 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                 /* If Open reported that we actually created a file
                 then we now have to set the mode if possible */
                 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
-                        (oplock & CIFS_CREATE_ACTION))
+                        (oplock & CIFS_CREATE_ACTION)) {
+                        mode &= ~current->fs->umask;
                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode,
                                         (__u64)current->fsuid,
@@ -226,7 +227,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
                                         cifs_sb->mnt_cifs_flags &
                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
                         }
-                else {
+                } else {
                         /* BB implement mode setting via Windows security
                            descriptors e.g. */
                         /* CIFSSMBWinSetPerms(xid,pTcon,path,mode,-1,-1,nls);*/
@@ -336,6 +337,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
         if (full_path == NULL)
                 rc = -ENOMEM;
         else if (pTcon->ses->capabilities & CAP_UNIX) {
+                mode &= ~current->fs->umask;
                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
                         rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
                                 mode, (__u64)current->fsuid,