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btrfs: qgroup: Refactor btrfs_qgroup_trace_subtree_swap 

Refactor btrfs_qgroup_trace_subtree_swap() into
qgroup_trace_subtree_swap(), which only needs two extent buffer and some
other bool to control the behavior.

This provides the basis for later delayed subtree scan work.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-01-23 15:15:15 +08:00 committed by David Sterba
parent d2311e6985
commit 5aea1a4fcf
1 changed files with 56 additions and 21 deletions
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77
fs/btrfs/qgroup.c
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@ -2017,6 +2017,59 @@ out:
return ret;
}
static int qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
struct extent_buffer *src_eb,
struct extent_buffer *dst_eb,
u64 last_snapshot, bool trace_leaf)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_path *dst_path = NULL;
int level;
int ret;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
return 0;
/* Wrong parameter order */
if (btrfs_header_generation(src_eb) > btrfs_header_generation(dst_eb)) {
btrfs_err_rl(fs_info,
"%s: bad parameter order, src_gen=%llu dst_gen=%llu", __func__,
btrfs_header_generation(src_eb),
btrfs_header_generation(dst_eb));
return -EUCLEAN;
}
if (!extent_buffer_uptodate(src_eb) || !extent_buffer_uptodate(dst_eb)) {
ret = -EIO;
goto out;
}
level = btrfs_header_level(dst_eb);
dst_path = btrfs_alloc_path();
if (!dst_path) {
ret = -ENOMEM;
goto out;
}
/* For dst_path */
extent_buffer_get(dst_eb);
dst_path->nodes[level] = dst_eb;
dst_path->slots[level] = 0;
dst_path->locks[level] = 0;
/* Do the generation aware breadth-first search */
ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
level, last_snapshot, trace_leaf);
if (ret < 0)
goto out;
ret = 0;
out:
btrfs_free_path(dst_path);
if (ret < 0)
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
return ret;
}
/*
* Inform qgroup to trace subtree swap used in balance.
*
@ -2042,14 +2095,12 @@ int btrfs_qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
u64 last_snapshot)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_path *dst_path = NULL;
struct btrfs_key first_key;
struct extent_buffer *src_eb = NULL;
struct extent_buffer *dst_eb = NULL;
bool trace_leaf = false;
u64 child_gen;
u64 child_bytenr;
int level;
int ret;
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
@ -2100,22 +2151,9 @@ int btrfs_qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
goto out;
}
level = btrfs_header_level(dst_eb);
dst_path = btrfs_alloc_path();
if (!dst_path) {
ret = -ENOMEM;
goto out;
}
/* For dst_path */
extent_buffer_get(dst_eb);
dst_path->nodes[level] = dst_eb;
dst_path->slots[level] = 0;
dst_path->locks[level] = 0;
/* Do the generation-aware breadth-first search */
ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
level, last_snapshot, trace_leaf);
/* Do the generation aware breadth-first search */
ret = qgroup_trace_subtree_swap(trans, src_eb, dst_eb, last_snapshot,
trace_leaf);
if (ret < 0)
goto out;
ret = 0;
@ -2123,9 +2161,6 @@ int btrfs_qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
out:
free_extent_buffer(src_eb);
free_extent_buffer(dst_eb);
btrfs_free_path(dst_path);
if (ret < 0)
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
return ret;
}