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| author | Goldwyn Rodrigues <rgoldwyn@suse.com> | 2016-01-14 23:17:35 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 00:00:49 (GMT) |
| commit | 1cce4df04f37d3f7b969e85528fa54f918a06f03 (patch) | |
| tree | 77755e8b83e444e1d7a7be7c9384735446666e8c /fs/ocfs2/dlmglue.c | |
| parent | 1247017f43a93eae3d64b7c25f3637dc545f5a47 (diff) | |
| download | linux-1cce4df04f37d3f7b969e85528fa54f918a06f03.tar.xz | |
ocfs2: do not lock/unlock() inode DLM lock
DLM does not cache locks. So, blocking lock and unlock will only make
the performance worse where contention over the locks is high.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2/dlmglue.c')
| -rw-r--r-- | fs/ocfs2/dlmglue.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 20276e3..f92612e 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2432,12 +2432,6 @@ bail: * done this we have to return AOP_TRUNCATED_PAGE so the aop method * that called us can bubble that back up into the VFS who will then * immediately retry the aop call. - * - * We do a blocking lock and immediate unlock before returning, though, so that - * the lock has a great chance of being cached on this node by the time the VFS - * calls back to retry the aop. This has a potential to livelock as nodes - * ping locks back and forth, but that's a risk we're willing to take to avoid - * the lock inversion simply. */ int ocfs2_inode_lock_with_page(struct inode *inode, struct buffer_head **ret_bh, @@ -2449,8 +2443,6 @@ int ocfs2_inode_lock_with_page(struct inode *inode, ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); if (ret == -EAGAIN) { unlock_page(page); - if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) - ocfs2_inode_unlock(inode, ex); ret = AOP_TRUNCATED_PAGE; } |