From: Naohiro Aota naohiro.aota@wdc.com
commit 50475cd57706359d6cc652be88369dace7a4c2eb upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/extent-tree.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
--- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3947,6 +3947,19 @@ static void found_extent(struct find_fre } }
+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) { @@ -4034,6 +4047,10 @@ static int find_free_extent_update_loop( 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;