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btrfs: Check mergeable free space when removing a cluster

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After returing extents from a cluster to the block group, some
extents in the block group may be mergeable.

Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan 2010-11-09 14:57:39 +08:00
parent 120d66eec0
commit f333adb5d6
1 changed files with 20 additions and 6 deletions
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26
fs/btrfs/free-space-cache.c
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@ -987,11 +987,18 @@ tree_search_offset(struct btrfs_block_group_cache *block_group,
return entry;
}
static void unlink_free_space(struct btrfs_block_group_cache *block_group,
struct btrfs_free_space *info)
static inline void
__unlink_free_space(struct btrfs_block_group_cache *block_group,
struct btrfs_free_space *info)
{
rb_erase(&info->offset_index, &block_group->free_space_offset);
block_group->free_extents--;
}
static void unlink_free_space(struct btrfs_block_group_cache *block_group,
struct btrfs_free_space *info)
{
__unlink_free_space(block_group, info);
block_group->free_space -= info->bytes;
}
@ -1364,7 +1371,7 @@ out:
}
bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
struct btrfs_free_space *info)
struct btrfs_free_space *info, bool update_stat)
{
struct btrfs_free_space *left_info;
struct btrfs_free_space *right_info;
@ -1385,7 +1392,10 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
left_info = tree_search_offset(block_group, offset - 1, 0, 0);
if (right_info && !right_info->bitmap) {
unlink_free_space(block_group, right_info);
if (update_stat)
unlink_free_space(block_group, right_info);
else
__unlink_free_space(block_group, right_info);
info->bytes += right_info->bytes;
kfree(right_info);
merged = true;
@ -1393,7 +1403,10 @@ bool try_merge_free_space(struct btrfs_block_group_cache *block_group,
if (left_info && !left_info->bitmap &&
left_info->offset + left_info->bytes == offset) {
unlink_free_space(block_group, left_info);
if (update_stat)
unlink_free_space(block_group, left_info);
else
__unlink_free_space(block_group, left_info);
info->offset = left_info->offset;
info->bytes += left_info->bytes;
kfree(left_info);
@ -1418,7 +1431,7 @@ int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
spin_lock(&block_group->tree_lock);
if (try_merge_free_space(block_group, info))
if (try_merge_free_space(block_group, info, true))
goto link;
/*
@ -1636,6 +1649,7 @@ __btrfs_return_cluster_to_free_space(
node = rb_next(&entry->offset_index);
rb_erase(&entry->offset_index, &cluster->root);
BUG_ON(entry->bitmap);
try_merge_free_space(block_group, entry, false);
tree_insert_offset(&block_group->free_space_offset,
entry->offset, &entry->offset_index, 0);
}