diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-15 15:06:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-15 15:06:37 -0700 |
| commit | dcbeb0bec5f2695c3ff53f174efb8e03c209f3f3 (patch) | |
| tree | 30d223a3a3c7470c657284ef030657bd1753d4d3 /fs/btrfs/extent-tree.c | |
| parent | 2b650df2cea96e487f2fd9ecaa68e533ea9b5ed7 (diff) | |
| parent | 444528b3e614f7f2391488d9bca8e0b872db909b (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable:
Btrfs: always pin metadata in discard mode
Btrfs: enable discard support
Btrfs: add -o discard option
Btrfs: properly wait log writers during log sync
Btrfs: fix possible ENOSPC problems with truncate
Btrfs: fix btrfs acl #ifdef checks
Btrfs: streamline tree-log btree block writeout
Btrfs: avoid tree log commit when there are no changes
Btrfs: only write one super copy during fsync
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index d0c4d584efa..e238a0cdac6 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1568,23 +1568,23 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans, return ret; } -#ifdef BIO_RW_DISCARD static void btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len) { blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, DISCARD_FL_BARRIER); } -#endif static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, u64 num_bytes) { -#ifdef BIO_RW_DISCARD int ret; u64 map_length = num_bytes; 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); @@ -1604,9 +1604,6 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, } return ret; -#else - return 0; -#endif } int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, @@ -3690,6 +3687,14 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans, if (is_data) goto pinit; + /* + * discard is sloooow, and so triggering discards on + * individual btree blocks isn't a good plan. Just + * pin everything in discard mode. + */ + if (btrfs_test_opt(root, DISCARD)) + goto pinit; + buf = btrfs_find_tree_block(root, bytenr, num_bytes); if (!buf) goto pinit; |