From: Li Zefan <lizf@cn.fujitsu.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: Josef Bacik <josef@redhat.com>,
linux-btrfs@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 6/6] btrfs: check mergeable free space when removing a cluster
Date: Mon, 23 Aug 2010 09:24:07 +0800 [thread overview]
Message-ID: <4C71CDB7.6000602@cn.fujitsu.com> (raw)
In-Reply-To: <4C71CD4B.10606@cn.fujitsu.com>
After returing extents from a cluster to the block group, some
extents in the block group may be mergeable.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
fs/btrfs/free-space-cache.c | 26 ++++++++++++++++++++------
1 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index faeec8f..c11f4f7 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -234,11 +234,18 @@ 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;
}
@@ -611,7 +618,7 @@ 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;
@@ -632,7 +639,10 @@ 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;
@@ -640,7 +650,10 @@ 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);
@@ -665,7 +678,7 @@ 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;
/*
@@ -883,6 +896,7 @@ __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);
}
--
1.7.0.1
next prev parent reply other threads:[~2010-08-23 1:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-23 1:22 [PATCH 0/6] btrfs: some bug fixes for free space cache Li Zefan
2010-08-23 1:22 ` [PATCH 1/6] btrfs: fix threshold calculation for block groups smaller than 1GB Li Zefan
2010-08-23 13:02 ` Josef Bacik
2010-08-23 1:23 ` [PATCH 2/6] btrfs: add helper function free_bitmap() Li Zefan
2010-08-23 13:03 ` Josef Bacik
2010-08-23 1:23 ` [PATCH 3/6] btrfs: free fully occupied bitmap in cluster Li Zefan
2010-08-23 13:04 ` Josef Bacik
2010-08-23 1:23 ` [PATCH 4/6] btrfs: update stats when allocating from a cluster Li Zefan
2010-08-23 13:09 ` Josef Bacik
2010-08-24 0:50 ` Li Zefan
2010-08-24 2:50 ` Josef Bacik
2010-08-23 1:23 ` [PATCH 5/6] btrfs: add a helper try_merge_free_space() Li Zefan
2010-08-23 13:15 ` Josef Bacik
2010-08-23 1:24 ` Li Zefan [this message]
2010-08-23 13:15 ` [PATCH 6/6] btrfs: check mergeable free space when removing a cluster Josef Bacik
2010-08-24 1:04 ` Li Zefan
2010-08-24 2:58 ` Josef Bacik
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