cifs: Call id to SID mapping functions to change owner/group (try #4 repost)

Now build security descriptor to change either owner or group at the
server.  Initially security descriptor was built to change only
(D)ACL, that functionality has been extended.

When either an Owner or a Group of a file object at the server is changed,
rest of security descriptor remains same (DACL etc.).

To set security descriptor, it is necessary to open that file
with permission bits of either WRITE_DAC if DACL is being modified or
WRITE_OWNER (Take Ownership) if Owner or Group is being changed.

It is the server that decides whether a set security descriptor with
either owner or group change succeeds or not.

Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 94834dbb46da..a1fa9cec05d6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -146,11 +146,12 @@ extern int cifs_get_inode_info_unix(struct inode **pinode,
 extern int cifs_acl_to_fattr(struct cifs_sb_info *cifs_sb,
                               struct cifs_fattr *fattr, struct inode *inode,
                               const char *path, const __u16 *pfid);
-extern int mode_to_cifs_acl(struct inode *inode, const char *path, __u64);
+extern int id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64,
+                                        uid_t, gid_t);
 extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *,
                                         const char *, u32 *);
 extern int set_cifs_acl(struct cifs_ntsd *, __u32, struct inode *,
-                                const char *);
+                                const char *, int);
 
 extern void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
                                struct cifs_sb_info *cifs_sb);
@@ -420,7 +421,7 @@ extern int CIFSSMBSetEA(const int xid, struct cifs_tcon *tcon,
 extern int CIFSSMBGetCIFSACL(const int xid, struct cifs_tcon *tcon,
                         __u16 fid, struct cifs_ntsd **acl_inf, __u32 *buflen);
 extern int CIFSSMBSetCIFSACL(const int, struct cifs_tcon *, __u16,
-                        struct cifs_ntsd *, __u32);
+                        struct cifs_ntsd *, __u32, int);
 extern int CIFSSMBGetPosixACL(const int xid, struct cifs_tcon *tcon,
                 const unsigned char *searchName,
                 char *acl_inf, const int buflen, const int acl_type,