[PATCH 24/28] staging/lustre/llite: ll_revalidate_dentry update

Oleg Drokin
2016-06-20T02:11:50Z

From: Oleg Drokin <oleg.drokin@intel.com>

There are a couple of cases in ll_revalidate_dentry() where
we are pretty sure the dentry is valid, so check for them early
and save more expensive checks for later.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
---
drivers/staging/lustre/lustre/llite/dcache.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/staging/lustre/lustre/llite/dcache.c b/drivers/staging/lustre/lustre/llite/dcache.c
index d964f4f..581a63a 100644
--- a/drivers/staging/lustre/lustre/llite/dcache.c
+++ b/drivers/staging/lustre/lustre/llite/dcache.c
@@ -302,6 +302,17 @@ static int ll_revalidate_dentry(struct dentry *dentry,
{
struct inode *dir = d_inode(dentry->d_parent);

+ /* If this is intermediate component path lookup and we were able to get
+ * to this dentry, then its lock has not been revoked and the
+ * path component is valid.
+ */
+ if (lookup_flags & LOOKUP_PARENT)
+ return 1;
+
+ /* Symlink - always valid as long as the dentry was found */
+ if (dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode))
+ return 1;
+
/*
* if open&create is set, talk to MDS to make sure file is created if
* necessary, because we can't do this in ->open() later since that's
--
2.7.4