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Btrfs: add snapshot/subvolume destroy ioctl

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This patch adds snapshot/subvolume destroy ioctl.  A subvolume that isn't being
used and doesn't contains links to other subvolumes can be destroyed.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng
2009-09-21 16:00:26 -04:00
committed by Chris Mason
parent 4df27c4d5c
commit 76dda93c6a
12 changed files with 610 additions and 238 deletions
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13
fs/btrfs/tree-log.c
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@@ -2841,7 +2841,7 @@ static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans,
if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb)
break;
if (parent == sb->s_root)
if (IS_ROOT(parent))
break;
parent = parent->d_parent;
@@ -2880,6 +2880,12 @@ int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
goto end_no_trans;
}
if (root != BTRFS_I(inode)->root ||
btrfs_root_refs(&root->root_item) == 0) {
ret = 1;
goto end_no_trans;
}
ret = check_parent_dirs_for_sync(trans, inode, parent,
sb, last_committed);
if (ret)
@@ -2907,12 +2913,15 @@ int btrfs_log_inode_parent(struct btrfs_trans_handle *trans,
break;
inode = parent->d_inode;
if (root != BTRFS_I(inode)->root)
break;
if (BTRFS_I(inode)->generation >
root->fs_info->last_trans_committed) {
ret = btrfs_log_inode(trans, root, inode, inode_only);
BUG_ON(ret);
}
if (parent == sb->s_root)
if (IS_ROOT(parent))
break;
parent = parent->d_parent;