diff options
| author | Zhao Lei <zhaolei@cn.fujitsu.com> | 2016-01-07 18:38:48 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-02-18 10:27:23 +0100 |
| commit | 2fefd5583f8b86171c898f90cadac7c09ccf9d73 (patch) | |
| tree | 6f5c406bc2dc0ba63c36f3fb19e2462c9f42739c /fs/btrfs/ctree.h | |
| parent | 895a11b868347ca8e287f152f7816862ad4b179d (diff) | |
| download | lwn-2fefd5583f8b86171c898f90cadac7c09ccf9d73.tar.gz lwn-2fefd5583f8b86171c898f90cadac7c09ccf9d73.zip | |
btrfs: reada: limit max works count
Reada creates 2 works for each level of tree recursively.
In case of a tree having many levels, the number of created works
is 2^level_of_tree.
Actually we don't need so many works in parallel, this patch limits
max works to BTRFS_MAX_MIRRORS * 2.
The per-fs works_counter will be also used for btrfs_reada_wait() to
check is there are background workers.
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index e557e05d2318..e43d987e1c99 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1822,6 +1822,9 @@ struct btrfs_fs_info { spinlock_t reada_lock; struct radix_tree_root reada_tree; + /* readahead works cnt */ + atomic_t reada_works_cnt; + /* Extent buffer radix tree */ spinlock_t buffer_lock; struct radix_tree_root buffer_radix; |