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authorLi Dongyang <lidongyang@novell.com>2011-03-24 10:24:27 +0000
committerroot <Chris Mason chris.mason@oracle.com>2011-03-28 05:37:46 -0400
commit5378e60734f5b7bfe1b43dc191aaf6131c1befe7 (patch)
treeb02c78e744a2a148b60a9c8046abef3f4381f544 /fs/btrfs/extent-tree.c
parentfce3bb9a1bd492793170e117c60d5718b7896af4 (diff)
Btrfs: adjust btrfs_discard_extent() return errors and trimmed bytes
Callers of btrfs_discard_extent() should check if we are mounted with -o discard, as we want to make fitrim to work even the fs is not mounted with -o discard. Also we should use REQ_DISCARD to map the free extent to get a full mapping, last we only return errors if 1. the error is not a EOPNOTSUPP 2. no device supports discard Signed-off-by: Li Dongyang <lidongyang@novell.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c43
1 files changed, 26 insertions, 17 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0671f5b77eb8..e990d2d1ba4a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1738,39 +1738,45 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
return ret;
}
-static void btrfs_issue_discard(struct block_device *bdev,
+static int btrfs_issue_discard(struct block_device *bdev,
u64 start, u64 len)
{
- blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0);
+ return blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_NOFS, 0);
}
static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
- u64 num_bytes)
+ u64 num_bytes, u64 *actual_bytes)
{
int ret;
- u64 map_length = num_bytes;
+ u64 discarded_bytes = 0;
struct btrfs_multi_bio *multi = NULL;
- if (!btrfs_test_opt(root, DISCARD))
- return 0;
/* 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);
+ ret = btrfs_map_block(&root->fs_info->mapping_tree, REQ_DISCARD,
+ bytenr, &num_bytes, &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++) {
- btrfs_issue_discard(stripe->dev->bdev,
- stripe->physical,
- map_length);
+ ret = btrfs_issue_discard(stripe->dev->bdev,
+ stripe->physical,
+ stripe->length);
+ if (!ret)
+ discarded_bytes += stripe->length;
+ else if (ret != -EOPNOTSUPP)
+ break;
}
kfree(multi);
}
+ if (discarded_bytes && ret == -EOPNOTSUPP)
+ ret = 0;
+
+ if (actual_bytes)
+ *actual_bytes = discarded_bytes;
+
return ret;
}
@@ -4371,7 +4377,9 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
if (ret)
break;
- ret = btrfs_discard_extent(root, start, end + 1 - start);
+ if (btrfs_test_opt(root, DISCARD))
+ ret = btrfs_discard_extent(root, start,
+ end + 1 - start, NULL);
clear_extent_dirty(unpin, start, end, GFP_NOFS);
unpin_extent_range(root, start, end);
@@ -5427,7 +5435,8 @@ int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len)
return -ENOSPC;
}
- ret = btrfs_discard_extent(root, start, len);
+ if (btrfs_test_opt(root, DISCARD))
+ ret = btrfs_discard_extent(root, start, len, NULL);
btrfs_add_free_space(cache, start, len);
btrfs_update_reserved_bytes(cache, len, 0, 1);
@@ -8765,7 +8774,7 @@ int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
}
int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
- u64 num_bytes)
+ u64 num_bytes, u64 *actual_bytes)
{
- return btrfs_discard_extent(root, bytenr, num_bytes);
+ return btrfs_discard_extent(root, bytenr, num_bytes, actual_bytes);
}