diff mbox

[v6,85/99] btrfs: Remove unused spinlock

Message ID 20180117202203.19756-86-willy@infradead.org (mailing list archive)
State New, archived
Headers show

Commit Message

Matthew Wilcox (Oracle) Jan. 17, 2018, 8:21 p.m. UTC 
From: Matthew Wilcox <mawilcox@microsoft.com>

The reada_lock in struct btrfs_device was only initialised, and not
actually used.  That's good because there's another lock also called
reada_lock in the btrfs_fs_info that was quite heavily used.  Remove
this one.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
---
 fs/btrfs/volumes.c | 1 -
 fs/btrfs/volumes.h | 1 -
 2 files changed, 2 deletions(-)

Comments

David Sterba Jan. 18, 2018, 2:22 p.m. UTC | #1 
On Wed, Jan 17, 2018 at 12:21:49PM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@microsoft.com>
> 
> The reada_lock in struct btrfs_device was only initialised, and not
> actually used.  That's good because there's another lock also called
> reada_lock in the btrfs_fs_info that was quite heavily used.  Remove
> this one.
> 
> Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>

I'll pick this one now, thanks.
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diff mbox

Patch

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index a25684287501..cba286183ff9 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -244,7 +244,6 @@  static struct btrfs_device *__alloc_device(void)
 
 	spin_lock_init(&dev->io_lock);
 
-	spin_lock_init(&dev->reada_lock);
 	atomic_set(&dev->reada_in_flight, 0);
 	atomic_set(&dev->dev_stats_ccnt, 0);
 	btrfs_device_data_ordered_init(dev);
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index ff15208344a7..335fd1590458 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -136,7 +136,6 @@  struct btrfs_device {
 	struct work_struct rcu_work;
 
 	/* readahead state */
-	spinlock_t reada_lock;
 	atomic_t reada_in_flight;
 	u64 reada_next;
 	struct reada_zone *reada_curr_zone;