Re: [Cluster-devel] gfs2: gfs2_dir_get_hash_table(): avoiding deferred vfree() is easy here...

From: Steven Whitehouse
Date: Thu Nov 20 2014 - 12:19:28 EST


Hi,

All five patches now in the GFS2 -nmw tree. Thanks,

Steve.

On 20/11/14 05:19, Al Viro wrote:
vfree() is allowed under spinlock these days, but it's cheaper when
it doesn't step into deferred case and here it's very easy to avoid.

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/gfs2/dir.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index c247fed..c5a34f0 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -370,11 +370,12 @@ static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
}
spin_lock(&inode->i_lock);
- if (ip->i_hash_cache)
- kvfree(hc);
- else
+ if (likely(!ip->i_hash_cache)) {
ip->i_hash_cache = hc;
+ hc = NULL;
+ }
spin_unlock(&inode->i_lock);
+ kvfree(hc);
return ip->i_hash_cache;
}

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