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| author | Liu Bo <bo.li.liu@oracle.com> | 2017-02-14 02:42:30 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-02-17 14:03:48 +0300 |
| commit | 0c9b36e0d72c0648d5274adf9b7a2141e1085208 (patch) | |
| tree | 9d1634ec3c9d3c689ad44a874e6598acc33b1b99 /fs/btrfs/extent-tree.c | |
| parent | 6f6b643e44ef79cbd85e69800a06326805829aa8 (diff) | |
| download | linux-0c9b36e0d72c0648d5274adf9b7a2141e1085208.tar.xz | |
Btrfs: try to avoid acquiring free space ctl's lock
We don't need to take the lock if the block group has not been cached.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 0992cd1393a6..85109de0e140 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7714,18 +7714,20 @@ unclustered_alloc: last_ptr->fragmented = 1; spin_unlock(&last_ptr->lock); } - spin_lock(&block_group->free_space_ctl->tree_lock); - if (cached && - block_group->free_space_ctl->free_space < - num_bytes + empty_cluster + empty_size) { - if (block_group->free_space_ctl->free_space > - max_extent_size) - max_extent_size = - block_group->free_space_ctl->free_space; - spin_unlock(&block_group->free_space_ctl->tree_lock); - goto loop; + if (cached) { + struct btrfs_free_space_ctl *ctl = + block_group->free_space_ctl; + + spin_lock(&ctl->tree_lock); + if (ctl->free_space < + num_bytes + empty_cluster + empty_size) { + if (ctl->free_space > max_extent_size) + max_extent_size = ctl->free_space; + spin_unlock(&ctl->tree_lock); + goto loop; + } + spin_unlock(&ctl->tree_lock); } - spin_unlock(&block_group->free_space_ctl->tree_lock); offset = btrfs_find_space_for_alloc(block_group, search_start, num_bytes, empty_size, |