btrfs: remove fs_info argument from btrfs_reserve_metadata_bytes()

We don't need it since we can grab fs_info from the given space_info.
So remove the fs_info argument.

Reviewed-by: Qu Wenruo <[e-mail]>
Reviewed-by: Johannes Thumshirn <[e-mail]>
Reviewed-by: Anand Jain <[e-mail]>
Signed-off-by: Filipe Manana <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/block-rsv.c

···
 	if (num_bytes == 0)
 		return 0;
 
-	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,
-					   num_bytes, flush);
+	ret = btrfs_reserve_metadata_bytes(block_rsv->space_info, num_bytes, flush);
 	if (!ret)
 		btrfs_block_rsv_add_bytes(block_rsv, num_bytes, true);
 
···
 	if (!ret)
 		return 0;
 
-	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,
-					   num_bytes, flush);
+	ret = btrfs_reserve_metadata_bytes(block_rsv->space_info, num_bytes, flush);
 	if (!ret) {
 		btrfs_block_rsv_add_bytes(block_rsv, num_bytes, false);
 		return 0;
···
 				block_rsv->type, ret);
 	}
 try_reserve:
-	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,
-					   blocksize, BTRFS_RESERVE_NO_FLUSH);
+	ret = btrfs_reserve_metadata_bytes(block_rsv->space_info, blocksize,
+					   BTRFS_RESERVE_NO_FLUSH);
 	if (!ret)
 		return block_rsv;
 	/*
···
 	 * one last time to force a reservation if there's enough actual space
 	 * on disk to make the reservation.
 	 */
-	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info, blocksize,
+	ret = btrfs_reserve_metadata_bytes(block_rsv->space_info, blocksize,
 					   BTRFS_RESERVE_FLUSH_EMERGENCY);
 	if (!ret)
 		return block_rsv;

fs/btrfs/delalloc-space.c

···
 						 noflush);
 	if (ret)
 		return ret;
-	ret = btrfs_reserve_metadata_bytes(fs_info, block_rsv->space_info,
-					   meta_reserve, flush);
+	ret = btrfs_reserve_metadata_bytes(block_rsv->space_info, meta_reserve,
+					   flush);
 	if (ret) {
 		btrfs_qgroup_free_meta_prealloc(root, qgroup_reserve);
 		return ret;

fs/btrfs/delayed-ref.c

···
 	if (!num_bytes)
 		return 0;
 
-	ret = btrfs_reserve_metadata_bytes(fs_info, space_info, num_bytes, flush);
+	ret = btrfs_reserve_metadata_bytes(space_info, num_bytes, flush);
 	if (ret)
 		return ret;
 

fs/btrfs/space-info.c

···
 /*
  * Try to reserve metadata bytes from the block_rsv's space.
  *
- * @fs_info:    the filesystem
  * @space_info: the space_info we're allocating for
  * @orig_bytes: number of bytes we want
  * @flush:      whether or not we can flush to make our reservation
···
  * regain reservations will be made and this will fail if there is not enough
  * space already.
  */
-int btrfs_reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
-				 struct btrfs_space_info *space_info,
+int btrfs_reserve_metadata_bytes(struct btrfs_space_info *space_info,
 				 u64 orig_bytes,
 				 enum btrfs_reserve_flush_enum flush)
 {
···
 
 	ret = __reserve_bytes(space_info, orig_bytes, flush);
 	if (ret == -ENOSPC) {
+		struct btrfs_fs_info *fs_info = space_info->fs_info;
+
 		trace_btrfs_space_reservation(fs_info, "space_info:enospc",
 					      space_info->flags, orig_bytes, 1);
 

fs/btrfs/space-info.h

···
 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
 void btrfs_dump_space_info(struct btrfs_space_info *info, u64 bytes,
 			   bool dump_block_groups);
-int btrfs_reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
-				 struct btrfs_space_info *space_info,
+int btrfs_reserve_metadata_bytes(struct btrfs_space_info *space_info,
 				 u64 orig_bytes,
 				 enum btrfs_reserve_flush_enum flush);
 void btrfs_try_granting_tickets(struct btrfs_space_info *space_info);

fs/btrfs/transaction.c

···
 	 * We want to reserve all the bytes we may need all at once, so we only
 	 * do 1 enospc flushing cycle per transaction start.
 	 */
-	ret = btrfs_reserve_metadata_bytes(fs_info, si, bytes, flush);
+	ret = btrfs_reserve_metadata_bytes(si, bytes, flush);
 
 	/*
 	 * If we are an emergency flush, which can steal from the global block
···
 	if (ret && flush == BTRFS_RESERVE_FLUSH_ALL_STEAL) {
 		bytes -= *delayed_refs_bytes;
 		*delayed_refs_bytes = 0;
-		ret = btrfs_reserve_metadata_bytes(fs_info, si, bytes, flush);
+		ret = btrfs_reserve_metadata_bytes(si, bytes, flush);
 	}
 
 	return ret;