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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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41
fs/btrfs/relocation.c
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@@ -3203,6 +3203,7 @@ static int check_extent_flags(u64 flags)
return 0;
}
static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
{
struct rb_root blocks = RB_ROOT;
@@ -3220,6 +3221,9 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
if (!path)
return -ENOMEM;
rc->extents_found = 0;
rc->extents_skipped = 0;
rc->search_start = rc->block_group->key.objectid;
clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY,
GFP_NOFS);
@@ -3475,14 +3479,15 @@ int btrfs_relocate_block_group(struct btrfs_root *extent_root, u64 group_start)
btrfs_wait_ordered_extents(fs_info->tree_root, 0);
while (1) {
mutex_lock(&fs_info->cleaner_mutex);
btrfs_clean_old_snapshots(fs_info->tree_root);
mutex_unlock(&fs_info->cleaner_mutex);
rc->extents_found = 0;
rc->extents_skipped = 0;
mutex_lock(&fs_info->cleaner_mutex);
btrfs_clean_old_snapshots(fs_info->tree_root);
ret = relocate_block_group(rc);
mutex_unlock(&fs_info->cleaner_mutex);
if (ret < 0) {
err = ret;
break;
@@ -3530,6 +3535,26 @@ out:
return err;
}
static noinline_for_stack int mark_garbage_root(struct btrfs_root *root)
{
struct btrfs_trans_handle *trans;
int ret;
trans = btrfs_start_transaction(root->fs_info->tree_root, 1);
memset(&root->root_item.drop_progress, 0,
sizeof(root->root_item.drop_progress));
root->root_item.drop_level = 0;
btrfs_set_root_refs(&root->root_item, 0);
ret = btrfs_update_root(trans, root->fs_info->tree_root,
&root->root_key, &root->root_item);
BUG_ON(ret);
ret = btrfs_end_transaction(trans, root->fs_info->tree_root);
BUG_ON(ret);
return 0;
}
/*
* recover relocation interrupted by system crash.
*
@@ -3589,8 +3614,12 @@ int btrfs_recover_relocation(struct btrfs_root *root)
fs_root = read_fs_root(root->fs_info,
reloc_root->root_key.offset);
if (IS_ERR(fs_root)) {
err = PTR_ERR(fs_root);
goto out;
ret = PTR_ERR(fs_root);
if (ret != -ENOENT) {
err = ret;
goto out;
}
mark_garbage_root(reloc_root);
}
}