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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>
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cbdf5a2442
commit
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1 changed files with 25 additions and 0 deletions
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@ -18,6 +18,7 @@
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#include <linux/sched.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include "hash.h"
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#include "crc32c.h"
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#include "ctree.h"
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@ -1716,6 +1717,10 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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if (refs == 0) {
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u64 super_used;
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u64 root_used;
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#ifdef BIO_RW_DISCARD
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u64 map_length = num_bytes;
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struct btrfs_multi_bio *multi = NULL;
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#endif
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if (pin) {
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ret = pin_down_bytes(root, bytenr, num_bytes, 0);
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@ -1743,6 +1748,26 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
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ret = update_block_group(trans, root, bytenr, num_bytes, 0,
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mark_free);
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BUG_ON(ret);
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#ifdef BIO_RW_DISCARD
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/* Tell the block device(s) that the sectors can be discarded */
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ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
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bytenr, &map_length, &multi, 0);
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if (!ret) {
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struct btrfs_bio_stripe *stripe = multi->stripes;
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int i;
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if (map_length > num_bytes)
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map_length = num_bytes;
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for (i = 0; i < multi->num_stripes; i++, stripe++) {
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blkdev_issue_discard(stripe->dev->bdev,
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stripe->physical >> 9,
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map_length >> 9);
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}
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kfree(multi);
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}
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#endif
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}
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btrfs_free_path(path);
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finish_current_insert(trans, extent_root);
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