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btrfs: introduce extent allocation policy

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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>
This commit is contained in:
Naohiro Aota 2020-02-25 12:56:16 +09:00 committed by David Sterba
parent 6aafb30384
commit cb2f96f8ab
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/extent-tree.c
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@ -3427,6 +3427,10 @@ btrfs_release_block_group(struct btrfs_block_group *cache,
btrfs_put_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 * Structure used internally for find_free_extent() function. Wraps needed
* parameters. * parameters.
@ -3478,6 +3482,9 @@ struct find_free_extent_ctl {
/* Found result */ /* Found result */
u64 found_offset; 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.have_caching_bg = false;
ffe_ctl.orig_have_caching_bg = false; ffe_ctl.orig_have_caching_bg = false;
ffe_ctl.found_offset = 0; ffe_ctl.found_offset = 0;
ffe_ctl.policy = BTRFS_EXTENT_ALLOC_CLUSTERED;
ins->type = BTRFS_EXTENT_ITEM_KEY; ins->type = BTRFS_EXTENT_ITEM_KEY;
ins->objectid = 0; ins->objectid = 0;