lkml.org 
[lkml]   [2020]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC][PATCH v2 27/34] atomic_open(): return the right dentry in FMODE_OPENED case
Date
From: Al Viro <viro@zeniv.linux.org.uk>

->atomic_open() might have used a different alias than the one we'd
passed to it; in "not opened" case we take care of that, in "opened"
one we don't. Currently we don't care downstream of "opened" case
which alias to return; however, that will change shortly when we
get to unifying may_open() calls.

It's not hard to get right in all cases, anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/namei.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index a7730bbee162..c2244ee4b2f0 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2956,11 +2956,15 @@ static struct dentry *atomic_open(struct nameidata *nd, struct dentry *dentry,
d_lookup_done(dentry);
if (!error) {
if (file->f_mode & FMODE_OPENED) {
+ int acc_mode = op->acc_mode;
+ if (unlikely(dentry != file->f_path.dentry)) {
+ dput(dentry);
+ dentry = dget(file->f_path.dentry);
+ }
/*
* We didn't have the inode before the open, so check open
* permission here.
*/
- int acc_mode = op->acc_mode;
if (file->f_mode & FMODE_CREATED) {
WARN_ON(!(open_flag & O_CREAT));
fsnotify_create(dir, dentry);
--
2.11.0
\
 
 \ /
  Last update: 2020-02-23 02:25    [W:0.316 / U:10.376 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site