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Message-ID: <87ha80kqjc.fsf_-_@xmission.com>
Date: Sat, 15 Feb 2014 13:35:35 -0800
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Al Viro <viro@...iv.linux.org.uk>
Cc: "Serge E. Hallyn" <serge@...lyn.com>,
Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...capital.net>,
Rob Landley <rob@...dley.net>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Miklos Szeredi <miklos@...redi.hu>,
Christoph Hellwig <hch@...radead.org>,
Karel Zak <kzak@...hat.com>,
"J. Bruce Fields" <bfields@...ldses.org>
Subject: [PATCH 01/11] vfs: Document the effect of d_revalidate on d_find_alias
d_drop or check_submounts_and_drop called from d_revalidate can result
in renamed directories with child dentries being unhashed. These
renamed and drop directory dentries can be rehashed after
d_materialise_unique uses d_find_alias to find them.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
fs/dcache.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 265e0ce9769c..c71c86f7780e 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -726,7 +726,8 @@ EXPORT_SYMBOL(dget_parent);
* acquire the reference to alias and return it. Otherwise return NULL.
* Notice that if inode is a directory there can be only one alias and
* it can be unhashed only if it has no children, or if it is the root
- * of a filesystem.
+ * of a filesystem, or if the directory was renamed and d_revalidate
+ * was the first vfs operation to notice.
*
* If the inode has an IS_ROOT, DCACHE_DISCONNECTED alias, then prefer
* any other hashed alias over that one unless @want_discon is set,
--
1.7.5.4
--
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