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authorJosef Bacik <josef@redhat.com>2009-07-27 13:57:01 -0400
committerChris Mason <chris.mason@oracle.com>2009-07-27 13:57:01 -0400
commit68b38550ddbea13d296184bf69edff387618b1d3 (patch)
treec0c3901b77f273ac08c39c641586884f41a90b84 /fs/btrfs/disk-io.c
parent631c07c8d12bcc6ce4a0fbfbd64ea843d78e2b10 (diff)
Btrfs: change how we unpin extents
We are racy with async block caching and unpinning extents. This patch makes things much less complicated by only unpinning the extent if the block group is cached. We check the block_group->cached var under the block_group->lock spin lock. If it is set to BTRFS_CACHE_FINISHED then we update the pinned counters, and unpin the extent and add the free space back. If it is not set to this, we start the caching of the block group so the next time we unpin extents we can unpin the extent. This keeps us from racing with the async caching threads, lets us kill the fs wide async thread counter, and keeps us from having to set DELALLOC bits for every extent we hit if there are caching kthreads going. One thing that needed to be changed was btrfs_free_super_mirror_extents. Now instead of just looking for LOCKED extents, we also look for DIRTY extents, since we could have left some extents pinned in the previous transaction that will never get freed now that we are unmounting, which would cause us to leak memory. So btrfs_free_super_mirror_extents has been changed to btrfs_free_pinned_extents, and it will clear the extents locked for the super mirror, and any remaining pinned extents that may be present. Thank you, Signed-off-by: Josef Bacik <jbacik@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index ec2c915f7f4..c658397c747 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1567,7 +1567,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
atomic_set(&fs_info->async_delalloc_pages, 0);
atomic_set(&fs_info->async_submit_draining, 0);
atomic_set(&fs_info->nr_async_bios, 0);
- atomic_set(&fs_info->async_caching_threads, 0);
fs_info->sb = sb;
fs_info->max_extent = (u64)-1;
fs_info->max_inline = 8192 * 1024;
@@ -2339,7 +2338,7 @@ int close_ctree(struct btrfs_root *root)
free_extent_buffer(root->fs_info->csum_root->commit_root);
btrfs_free_block_groups(root->fs_info);
- btrfs_free_super_mirror_extents(root->fs_info);
+ btrfs_free_pinned_extents(root->fs_info);
del_fs_roots(fs_info);