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authorChris Mason <chris.mason@oracle.com>2008-11-17 21:02:50 -0500
committerChris Mason <chris.mason@oracle.com>2008-11-17 21:02:50 -0500
commit3de4586c5278a28107030c336956381f69ff7a9d (patch)
treed636e3806cd5ecff71927d0300e46526fa23de1a /fs/btrfs/super.c
parent4ce4cb526f67775c1cce3e3fa01c292672ba874e (diff)
Btrfs: Allow subvolumes and snapshots anywhere in the directory tree
Before, all snapshots and subvolumes lived in a single flat directory. This was awkward and confusing because the single flat directory was only writable with the ioctls. This commit changes the ioctls to create subvols and snapshots at any point in the directory tree. This requires making separate ioctls for snapshot and subvol creation instead of a combining them into one. The subvol ioctl does: btrfsctl -S subvol_name parent_dir After the ioctl is done subvol_name lives inside parent_dir. The snapshot ioctl does: btrfsctl -s path_for_snapshot root_to_snapshot path_for_snapshot can be an absolute or relative path. btrfsctl breaks it up into directory and basename components. root_to_snapshot can be any file or directory in the FS. The snapshot is taken of the entire root where that file lives. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r--fs/btrfs/super.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 92393cc60d0..77c5eff3e20 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -285,11 +285,11 @@ static int btrfs_parse_early_options(const char *options, int flags,
out:
/*
* If no subvolume name is specified we use the default one. Allocate
- * a copy of the string "default" here so that code later in the
+ * a copy of the string "." here so that code later in the
* mount path doesn't care if it's the default volume or another one.
*/
if (!*subvol_name) {
- *subvol_name = kstrdup("default", GFP_KERNEL);
+ *subvol_name = kstrdup(".", GFP_KERNEL);
if (!*subvol_name)
return -ENOMEM;
}
@@ -323,12 +323,12 @@ static int btrfs_fill_super(struct super_block * sb,
}
sb->s_fs_info = tree_root;
disk_super = &tree_root->fs_info->super_copy;
- inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
- tree_root);
+ inode = btrfs_iget_locked(sb, BTRFS_FIRST_FREE_OBJECTID,
+ tree_root->fs_info->fs_root);
bi = BTRFS_I(inode);
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
- bi->root = tree_root;
+ bi->root = tree_root->fs_info->fs_root;
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);