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authorShirish Pargaonkar <shirishpargaonkar@gmail.com>2011-09-26 18:56:44 +0400
committerSteve French <smfrench@gmail.com>2011-10-13 08:42:17 +0400
commit3d3ea8e64efbeb3e4289675dbbfab82333395642 (patch)
tree3f7c52039dceefeae2abf010a1a3ec8abef0c459 /fs/cifs/misc.c
parent8bc4392a1e50f346e97f8777aaefd9cfc3d45c9f (diff)
downloadlinux-3d3ea8e64efbeb3e4289675dbbfab82333395642.tar.xz
cifs: Add mount options for backup intent (try #6)
Add mount options backupuid and backugid. It allows an authenticated user to access files with the intent to back them up including their ACLs, who may not have access permission but has "Backup files and directories user right" on them (by virtue of being part of the built-in group Backup Operators. When mount options backupuid is specified, cifs client restricts the use of backup intents to the user whose effective user id is specified along with the mount option. When mount options backupgid is specified, cifs client restricts the use of backup intents to the users whose effective user id belongs to the group id specified along with the mount option. If an authenticated user is not part of the built-in group Backup Operators at the server, access to such files is denied, even if allowed by the client. Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/misc.c')
-rw-r--r--fs/cifs/misc.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 4a1801b3195f..703ef5c6fdb1 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -675,3 +675,18 @@ void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
cinode->clientCanCacheRead = false;
}
}
+
+bool
+backup_cred(struct cifs_sb_info *cifs_sb)
+{
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
+ if (cifs_sb->mnt_backupuid == current_fsuid())
+ return true;
+ }
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
+ if (in_group_p(cifs_sb->mnt_backupgid))
+ return true;
+ }
+
+ return false;
+}