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btrfs: Remove unused readahead spinlock

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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>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Matthew Wilcox
2018-01-17 12:21:49 -08:00
committed by David Sterba
parent 7583d8d088
commit 3cbf26da5e
2 changed files with 0 additions and 2 deletions
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1
fs/btrfs/volumes.h
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@@ -137,7 +137,6 @@ struct btrfs_device {
struct rcu_head rcu;
/* readahead state */
spinlock_t reada_lock;
atomic_t reada_in_flight;
u64 reada_next;
struct reada_zone *reada_curr_zone;