btrfs: introduce extent allocation policy

This commit introduces extent allocation policy for btrfs. This policy
controls how btrfs allocate an extents from block groups.  There is no
functional change introduced with this commit.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9d5563a63a1f6ed10875a4c7a995624764405efd..bd0d13661ea779706b78de7f7f5dac75fe2d1ef7 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3427,6 +3427,10 @@ btrfs_release_block_group(struct btrfs_block_group *cache,
        btrfs_put_block_group(cache);
 }
 
+enum btrfs_extent_allocation_policy {
+       BTRFS_EXTENT_ALLOC_CLUSTERED,
+};
+
 /*
  * Structure used internally for find_free_extent() function.  Wraps needed
  * parameters.
@@ -3478,6 +3482,9 @@ struct find_free_extent_ctl {
 
        /* Found result */
        u64 found_offset;
+
+       /* Allocation policy */
+       enum btrfs_extent_allocation_policy policy;
 };
 
 
@@ -3815,6 +3822,7 @@ static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
        ffe_ctl.have_caching_bg = false;
        ffe_ctl.orig_have_caching_bg = false;
        ffe_ctl.found_offset = 0;
+       ffe_ctl.policy = BTRFS_EXTENT_ALLOC_CLUSTERED;
 
        ins->type = BTRFS_EXTENT_ITEM_KEY;
        ins->objectid = 0;