fs/btrfs/volumes.c

6109 	struct btrfs_io_context *bioc;
6111 	bioc = kzalloc(
6118 	if (!bioc)
6121 	refcount_set(&bioc->refs, 1);
6123 	bioc->fs_info = fs_info;
6124 	bioc->replace_stripe_src = -1;
6125 	bioc->full_stripe_logical = (u64)-1;
6126 	bioc->logical = logical;
6128 	return bioc;
6131 void btrfs_get_bioc(struct btrfs_io_context *bioc)
6133 	WARN_ON(!refcount_read(&bioc->refs));
6134 	refcount_inc(&bioc->refs);
6137 void btrfs_put_bioc(struct btrfs_io_context *bioc)
6139 	if (!bioc)
6141 	if (refcount_dec_and_test(&bioc->refs))
6142 		kfree(bioc);
6304 				      struct btrfs_io_context *bioc,
6337 		struct btrfs_io_stripe *old = &bioc->stripes[i];
6338 		struct btrfs_io_stripe *new = &bioc->stripes[num_stripes + nr_extra_stripes];
6345 		if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK)
6346 			bioc->replace_stripe_src = i;
6358 		struct btrfs_io_stripe *first = &bioc->stripes[num_stripes];
6359 		struct btrfs_io_stripe *second = &bioc->stripes[num_stripes + 1];
6362 		ASSERT(bioc->map_type & BTRFS_BLOCK_GROUP_DUP);
6377 	bioc->replace_nr_stripes = nr_extra_stripes;
6642 	struct btrfs_io_context *bioc = NULL;
6742 	bioc = alloc_btrfs_io_context(fs_info, logical, num_alloc_stripes);
6743 	if (!bioc) {
6747 	bioc->map_type = map->type;
6766 		bioc->full_stripe_logical = map->start +
6770 			struct btrfs_io_stripe *dst = &bioc->stripes[i];
6783 		 * stripe into the bioc.
6787 					    &bioc->stripes[i], map, &io_geom);
6796 		btrfs_put_bioc(bioc);
6805 		handle_ops_on_dev_replace(op, bioc, dev_replace, logical,
6809 	*bioc_ret = bioc;
6810 	bioc->num_stripes = io_geom.num_stripes;
6811 	bioc->max_errors = io_geom.max_errors;
6812 	bioc->mirror_num = io_geom.mirror_num;
8319 static void map_raid56_repair_block(struct btrfs_io_context *bioc,
8323 	int data_stripes = nr_bioc_data_stripes(bioc);
8327 		u64 stripe_start = bioc->full_stripe_logical +
8335 	smap->dev = bioc->stripes[i].dev;
8336 	smap->physical = bioc->stripes[i].physical +
8337 			((logical - bioc->full_stripe_logical) &
8358 	struct btrfs_io_context *bioc = NULL;
8366 			      &bioc, smap, &mirror_ret);
8374 	if (!bioc)
8378 	if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
8379 		map_raid56_repair_block(bioc, smap, logical);
8383 	ASSERT(mirror_num <= bioc->num_stripes);
8384 	smap->dev = bioc->stripes[mirror_num - 1].dev;
8385 	smap->physical = bioc->stripes[mirror_num - 1].physical;
8387 	btrfs_put_bioc(bioc);