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Btrfs: Add btree locking to the tree defragmentation code

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The online btree defragger is simplified and rewritten to use
standard btree searches instead of a walk up / down mechanism.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-06-25 16:01:31 -04:00
parent a74a4b97b6
commit e7a84565bc
4 changed files with 93 additions and 201 deletions
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7
fs/btrfs/extent-tree.c
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@@ -2201,6 +2201,7 @@ int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len,
{
mutex_unlock(&root->fs_info->alloc_mutex);
lookup_extent_ref(NULL, root, start, len, refs);
cond_resched();
mutex_lock(&root->fs_info->alloc_mutex);
return lookup_extent_ref(NULL, root, start, len, refs);
}
@@ -2280,6 +2281,7 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
next = read_tree_block(root, bytenr, blocksize,
ptr_gen);
cond_resched();
mutex_lock(&root->fs_info->alloc_mutex);
/* we've dropped the lock, double check */
@@ -2329,6 +2331,7 @@ out:
*level += 1;
BUG_ON(ret);
mutex_unlock(&root->fs_info->alloc_mutex);
cond_resched();
return 0;
}
@@ -2448,6 +2451,10 @@ int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
break;
if (wret < 0)
ret = wret;
if (trans->transaction->in_commit) {
ret = -EAGAIN;
break;
}
}
for (i = 0; i <= orig_level; i++) {
if (path->nodes[i]) {