Btrfs: groundwork for subvolume and snapshot roots
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 66d9fb2..3c9236c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -436,7 +436,6 @@
{
struct btrfs_path *path;
struct btrfs_root_item *ri;
- int ret;
if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
return 0;
@@ -447,22 +446,19 @@
BUG_ON(!path);
mutex_lock(&root->fs_info->fs_mutex);
- ret = btrfs_lookup_inode(NULL, root, path, location, 0);
- if (ret)
- goto out;
- ri = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
- path->slots[0],
- struct btrfs_root_item);
+ *sub_root = btrfs_read_fs_root(root->fs_info, location);
+ if (IS_ERR(*sub_root))
+ return PTR_ERR(*sub_root);
+
+ ri = &(*sub_root)->root_item;
location->objectid = btrfs_root_dirid(ri);
location->flags = 0;
btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
location->offset = 0;
- /* FIXME properly select the root */
- *sub_root = root->fs_info->fs_root;
-out:
+
btrfs_free_path(path);
mutex_unlock(&root->fs_info->fs_mutex);
- return ret;
+ return 0;
}
@@ -494,6 +490,15 @@
if (!inode)
return ERR_PTR(-EACCES);
if (inode->i_state & I_NEW) {
+ if (sub_root != root) {
+ ret = radix_tree_insert(
+ &root->fs_info->fs_roots_radix,
+ (unsigned long)sub_root,
+ sub_root);
+printk("adding new root for inode %lu\n", inode->i_ino);
+ igrab(inode);
+ sub_root->inode = inode;
+ }
BTRFS_I(inode)->root = sub_root;
memcpy(&BTRFS_I(inode)->location, &location,
sizeof(location));
@@ -605,7 +610,7 @@
struct inode * inode;
struct dentry * root_dentry;
struct btrfs_super_block *disk_super;
- struct btrfs_root *root;
+ struct btrfs_root *tree_root;
struct btrfs_inode *bi;
sb->s_maxbytes = MAX_LFS_FILESIZE;
@@ -613,14 +618,14 @@
sb->s_op = &btrfs_super_ops;
sb->s_time_gran = 1;
- root = open_ctree(sb);
+ tree_root = open_ctree(sb);
- if (!root) {
+ if (!tree_root) {
printk("btrfs: open_ctree failed\n");
return -EIO;
}
- sb->s_fs_info = root;
- disk_super = root->fs_info->disk_super;
+ sb->s_fs_info = tree_root;
+ disk_super = tree_root->fs_info->disk_super;
printk("read in super total blocks %Lu root %Lu\n",
btrfs_super_total_blocks(disk_super),
btrfs_super_root_dir(disk_super));
@@ -630,7 +635,7 @@
bi->location.objectid = inode->i_ino;
bi->location.offset = 0;
bi->location.flags = 0;
- bi->root = root->fs_info->tree_root;
+ bi->root = tree_root;
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
if (!inode)