linux-kernel - [PATCH 10/10] 9p: honor AT_STATX_DONT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1505896805-12055-11-git-send-email-mszeredi@redhat.com>
Date:   Wed, 20 Sep 2017 10:40:05 +0200
From:   Miklos Szeredi <mszeredi@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        Latchesar Ionkov <lucho@...kov.net>
Subject: [PATCH 10/10] 9p: honor AT_STATX_DONT_SYNC

The description of this flag says "Don't sync attributes with the server".
In other words: always use the attributes cached in the kernel and don't
send network or local messages to refresh the attributes.

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Cc: Eric Van Hensbergen <ericvh@...il.com>
Cc: Ron Minnich <rminnich@...dia.gov>
Cc: Latchesar Ionkov <lucho@...kov.net>
---
 fs/9p/vfs_inode.c      | 4 +++-
 fs/9p/vfs_inode_dotl.c | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 2a5de610dd8f..0a7063f12c0b 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1065,7 +1065,9 @@ v9fs_vfs_getattr(const struct path *path, struct kstat *stat,
 
 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	v9ses = v9fs_dentry2v9ses(dentry);
-	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
+
+	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE ||
+	    (flags & AT_STATX_DONT_SYNC)) {
 		generic_fillattr(d_inode(dentry), stat);
 		return 0;
 	}
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 70f9887c59a9..92bf43981a0d 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -478,7 +478,8 @@ v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
 
 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
 	v9ses = v9fs_dentry2v9ses(dentry);
-	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
+	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE ||
+	    (flags & AT_STATX_DONT_SYNC)) {
 		generic_fillattr(d_inode(dentry), stat);
 		return 0;
 	}
-- 
2.5.5