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Commit 21af804c authored by David Woodhouse's avatar David Woodhouse Committed by Chris Mason
Browse files

Btrfs: Discard sector data in __free_extent() 



Date: Tue, 12 Aug 2008 14:13:26 +0100
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent cbdf5a24

fs/btrfs/extent-tree.c

+25 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/sched.h>

#include <linux/pagemap.h>

#include <linux/writeback.h>

#include <linux/blkdev.h>

#include "hash.h"

#include "crc32c.h"

#include "ctree.h"
@@ -1716,6 +1717,10 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root 
	if (refs == 0) {

		u64 super_used;

		u64 root_used;

#ifdef BIO_RW_DISCARD

		u64 map_length = num_bytes;

		struct btrfs_multi_bio *multi = NULL;

#endif



		if (pin) {

			ret = pin_down_bytes(root, bytenr, num_bytes, 0);
@@ -1743,6 +1748,26 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root 
		ret = update_block_group(trans, root, bytenr, num_bytes, 0,

					 mark_free);

		BUG_ON(ret);



#ifdef BIO_RW_DISCARD

		/* Tell the block device(s) that the sectors can be discarded */

		ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,

				      bytenr, &map_length, &multi, 0);

		if (!ret) {

			struct btrfs_bio_stripe *stripe = multi->stripes;

			int i;



			if (map_length > num_bytes)

				map_length = num_bytes;



			for (i = 0; i < multi->num_stripes; i++, stripe++) {

				blkdev_issue_discard(stripe->dev->bdev,

						     stripe->physical >> 9,

						     map_length >> 9);

			}

			kfree(multi);

		}

#endif

	}

	btrfs_free_path(path);

	finish_current_insert(trans, extent_root);