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Btrfs: Discard sector data in __free_extent() 

Date: Tue, 12 Aug 2008 14:13:26 +0100
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
David Woodhouse 2008-08-12 14:13:26 +01:00 committed by Chris Mason
parent cbdf5a2442
commit 21af804c07
1 changed files with 25 additions and 0 deletions
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25
fs/btrfs/extent-tree.c
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@ -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);