diff options
| author | Naohiro Aota <naohiro.aota@wdc.com> | 2021-12-08 00:35:48 +0900 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-01-07 14:18:26 +0100 |
| commit | 50475cd57706359d6cc652be88369dace7a4c2eb (patch) | |
| tree | e15ae8f576248963fcda79291824a0fa1d9eb472 /fs/btrfs | |
| parent | 1ada69f61c88abb75a1038ee457633325658a183 (diff) | |
btrfs: add extent allocator hook to decide to allocate chunk or not
Introduce a new hook for an extent allocator policy. With the new
hook, a policy can decide to allocate a new block group or not. If
not, it will return -ENOSPC, so btrfs_reserve_extent() will cut the
allocation size in half and retry the allocation if min_alloc_size is
large enough.
The hook has a place holder and will be replaced with the real
implementation in the next patch.
CC: stable@vger.kernel.org # 5.16
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 5362b54e3871..910bb08faeb8 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3974,6 +3974,19 @@ static void found_extent(struct find_free_extent_ctl *ffe_ctl, } } +static bool can_allocate_chunk(struct btrfs_fs_info *fs_info, + struct find_free_extent_ctl *ffe_ctl) +{ + switch (ffe_ctl->policy) { + case BTRFS_EXTENT_ALLOC_CLUSTERED: + return true; + case BTRFS_EXTENT_ALLOC_ZONED: + return true; + default: + BUG(); + } +} + static int chunk_allocation_failed(struct find_free_extent_ctl *ffe_ctl) { switch (ffe_ctl->policy) { @@ -4061,6 +4074,10 @@ static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info, struct btrfs_trans_handle *trans; int exist = 0; + /*Check if allocation policy allows to create a new chunk */ + if (!can_allocate_chunk(fs_info, ffe_ctl)) + return -ENOSPC; + trans = current->journal_info; if (trans) exist = 1; |