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Btrfs: Fix allocation completions in tree log replay 

After a crash, the tree log code uses btrfs_alloc_logged_extent to
record allocations of data extents that it finds in the log tree.  These
come in basically random order, which does not fit how
btrfs_remove_free_space() expects to be called.

btrfs_remove_free_space was changed to support recording an extent
allocation in the middle of a region of free space.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-09-24 11:23:25 -04:00
parent 60582d1e93
commit 9b49c9b9f9
1 changed files with 34 additions and 0 deletions
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34
fs/btrfs/free-space-cache.c
View File

@ -306,11 +306,45 @@ int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
ret = link_free_space(block_group, info);
BUG_ON(ret);
} else if (info && info->offset < offset &&
info->offset + info->bytes >= offset + bytes) {
u64 old_start = info->offset;
/*
* we're freeing space in the middle of the info,
* this can happen during tree log replay
*
* first unlink the old info and then
* insert it again after the hole we're creating
*/
unlink_free_space(block_group, info);
if (offset + bytes < info->offset + info->bytes) {
u64 old_end = info->offset + info->bytes;
info->offset = offset + bytes;
info->bytes = old_end - info->offset;
ret = link_free_space(block_group, info);
BUG_ON(ret);
} else {
/* the hole we're creating ends at the end
* of the info struct, just free the info
*/
kfree(info);
}
/* step two, insert a new info struct to cover anything
* before the hole
*/
spin_unlock(&block_group->lock);
ret = btrfs_add_free_space(block_group, old_start,
offset - old_start);
BUG_ON(ret);
goto out_nolock;
} else {
WARN_ON(1);
}
out:
spin_unlock(&block_group->lock);
out_nolock:
return ret;
}