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btrfs: qgroup: Switch rescan to new mechanism.

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Switch rescan to use the new new extent oriented mechanism.

As rescan is also based on extent, new mechanism is just a perfect match
for rescan.

With re-designed internal functions, rescan is quite easy, just call
btrfs_find_all_roots() and then btrfs_qgroup_account_one_extent().

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-04-13 11:02:16 +08:00 committed by Chris Mason
parent 550d7a2ed5
commit 9d220c95f5
1 changed files with 7 additions and 36 deletions
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43
fs/btrfs/qgroup.c
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@ -3002,15 +3002,13 @@ void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
*/
static int
qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
struct btrfs_trans_handle *trans, struct ulist *qgroups,
struct ulist *tmp, struct extent_buffer *scratch_leaf)
struct btrfs_trans_handle *trans,
struct extent_buffer *scratch_leaf)
{
struct btrfs_key found;
struct ulist *roots = NULL;
struct seq_list tree_mod_seq_elem = SEQ_LIST_INIT(tree_mod_seq_elem);
u64 num_bytes;
u64 seq;
int new_roots;
int slot;
int ret;
@ -3060,33 +3058,15 @@ qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
else
num_bytes = found.offset;
ulist_reinit(qgroups);
ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
&roots);
if (ret < 0)
goto out;
spin_lock(&fs_info->qgroup_lock);
seq = fs_info->qgroup_seq;
fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */
new_roots = 0;
ret = qgroup_calc_old_refcnt(fs_info, 0, tmp, roots, qgroups,
seq, &new_roots, 1);
if (ret < 0) {
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
/* For rescan, just pass old_roots as NULL */
ret = btrfs_qgroup_account_extent(trans, fs_info,
found.objectid, num_bytes, NULL, roots);
if (ret < 0)
goto out;
}
ret = qgroup_adjust_counters(fs_info, 0, num_bytes, qgroups,
seq, 0, new_roots, 1);
if (ret < 0) {
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
goto out;
}
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
}
out:
btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
@ -3100,7 +3080,6 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
qgroup_rescan_work);
struct btrfs_path *path;
struct btrfs_trans_handle *trans = NULL;
struct ulist *tmp = NULL, *qgroups = NULL;
struct extent_buffer *scratch_leaf = NULL;
int err = -ENOMEM;
int ret = 0;
@ -3108,12 +3087,6 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
path = btrfs_alloc_path();
if (!path)
goto out;
qgroups = ulist_alloc(GFP_NOFS);
if (!qgroups)
goto out;
tmp = ulist_alloc(GFP_NOFS);
if (!tmp)
goto out;
scratch_leaf = kmalloc(sizeof(*scratch_leaf), GFP_NOFS);
if (!scratch_leaf)
goto out;
@ -3129,7 +3102,7 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
err = -EINTR;
} else {
err = qgroup_rescan_leaf(fs_info, path, trans,
qgroups, tmp, scratch_leaf);
scratch_leaf);
}
if (err > 0)
btrfs_commit_transaction(trans, fs_info->fs_root);
@ -3139,8 +3112,6 @@ static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
out:
kfree(scratch_leaf);
ulist_free(qgroups);
ulist_free(tmp);
btrfs_free_path(path);
mutex_lock(&fs_info->qgroup_rescan_lock);