[5.4,171/191] fs: cifs: Fix atime update check vs mtime
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Message ID 20200107205342.153253181@linuxfoundation.org
State New
Headers show
Series
  • Untitled series #224927
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Commit Message

Greg KH Jan. 7, 2020, 8:54 p.m. UTC
From: Deepa Dinamani <deepa.kernel@gmail.com>

commit 69738cfdfa7032f45d9e7462d24490e61cf163dd upstream.

According to the comment in the code and commit log, some apps
expect atime >= mtime; but the introduced code results in
atime==mtime.  Fix the comparison to guard against atime<mtime.

Fixes: 9b9c5bea0b96 ("cifs: do not return atime less than mtime")
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: stfrench@microsoft.com
Cc: linux-cifs@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -163,7 +163,7 @@  cifs_fattr_to_inode(struct inode *inode,
 
 	spin_lock(&inode->i_lock);
 	/* we do not want atime to be less than mtime, it broke some apps */
-	if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime))
+	if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
 		inode->i_atime = fattr->cf_mtime;
 	else
 		inode->i_atime = fattr->cf_atime;