btrfs: deprecate subvolrootid mount option

This mount option was a workaround when subvol= assumed path relative
to the default subvolume, not the toplevel one. This was fixed long time
ago and subvolrootid has no effect.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 4 insertions, 13 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 3fd4f2c3d529..3c404b8e83bb 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -643,7 +643,7 @@ out:
  */
 static int btrfs_parse_early_options(const char *options, fmode_t flags,
                 void *holder, char **subvol_name, u64 *subvol_objectid,
-                u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices)
+                struct btrfs_fs_devices **fs_devices)
 {
         substring_t args[MAX_OPT_ARGS];
         char *device_name, *opts, *orig, *p;
@@ -686,16 +686,8 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
                         }
                         break;
                 case Opt_subvolrootid:
-                        intarg = 0;
-                        error = match_int(&args[0], &intarg);
-                        if (!error) {
-                                /* we want the original fs_tree */
-                                if (!intarg)
-                                        *subvol_rootid =
-                                                BTRFS_FS_TREE_OBJECTID;
-                                else
-                                        *subvol_rootid = intarg;
-                        }
+                        printk(KERN_WARNING
+                                "btrfs: 'subvolrootid' mount option is deprecated and has no effect\n");
                         break;
                 case Opt_device:
                         device_name = match_strdup(&args[0]);
@@ -1073,7 +1065,6 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
         fmode_t mode = FMODE_READ;
         char *subvol_name = NULL;
         u64 subvol_objectid = 0;
-        u64 subvol_rootid = 0;
         int error = 0;
 
         if (!(flags & MS_RDONLY))
@@ -1081,7 +1072,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
 
         error = btrfs_parse_early_options(data, mode, fs_type,
                                           &subvol_name, &subvol_objectid,
-                                          &subvol_rootid, &fs_devices);
+                                          &fs_devices);
         if (error) {
                 kfree(subvol_name);
                 return ERR_PTR(error);