diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index fff219ed61d..e63b3b4bed7 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -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); |