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Btrfs: Further reduce the concurrency penalty of defrag and drop_snapshot

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-08-08 20:17:12 -04:00 committed by David Woodhouse
parent 26b8003f10
commit 409eb95d7f
3 changed files with 11 additions and 12 deletions
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13
fs/btrfs/extent-tree.c
View File

@ -1312,7 +1312,10 @@ static void reada_walk_down(struct btrfs_root *root,
BUG_ON(ret);
if (refs != 1)
continue;
mutex_unlock(&root->fs_info->fs_mutex);
ret = readahead_tree_block(root, blocknr);
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
if (ret)
break;
}
@ -1445,7 +1448,6 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_path *path;
int i;
int orig_level;
int num_walks = 0;
struct btrfs_root_item *root_item = &root->root_item;
path = btrfs_alloc_path();
@ -1486,12 +1488,9 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
break;
if (wret < 0)
ret = wret;
num_walks++;
if (num_walks > 2) {
ret = -EAGAIN;
get_bh(root->node);
break;
}
ret = -EAGAIN;
get_bh(root->node);
break;
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {

3
fs/btrfs/transaction.c
View File

@ -364,6 +364,9 @@ int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info)
break;
}
root->defrag_running = 0;
radix_tree_tag_clear(&info->fs_roots_radix,
(unsigned long)root->root_key.objectid,
BTRFS_ROOT_DEFRAG_TAG);
}
}
btrfs_end_transaction(trans, tree_root);

7
fs/btrfs/tree-defrag.c
View File

@ -148,7 +148,6 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
int level;
int orig_level;
int i;
int num_runs = 0;
if (root->ref_cows == 0) {
goto out;
@ -200,10 +199,8 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
break;
if (wret < 0)
ret = wret;
if (num_runs++ > 8) {
ret = -EAGAIN;
break;
}
ret = -EAGAIN;
break;
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {