linux-kernel - [PATCH 12/27] r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch

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Message-Id: <20071101230842.4B1B69CE@kernel>
Date:	Thu, 01 Nov 2007 16:08:42 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, miklos@...redi.hu, hch@...radead.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 12/27] r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime



Acked-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 linux-2.6.git-dave/fs/inode.c |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff -puN fs/inode.c~r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime fs/inode.c
--- linux-2.6.git/fs/inode.c~r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime	2007-11-01 14:46:12.000000000 -0700
+++ linux-2.6.git-dave/fs/inode.c	2007-11-01 14:46:12.000000000 -0700
@@ -1203,22 +1203,23 @@ void touch_atime(struct vfsmount *mnt, s
 	struct inode *inode = dentry->d_inode;
 	struct timespec now;
 
-	if (inode->i_flags & S_NOATIME)
+	if (mnt && mnt_want_write(mnt))
 		return;
+	if (inode->i_flags & S_NOATIME)
+		goto out;
 	if (IS_NOATIME(inode))
-		return;
+		goto out;
 	if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))
-		return;
+		goto out;
 
 	/*
 	 * We may have a NULL vfsmount when coming from NFSD
 	 */
 	if (mnt) {
 		if (mnt->mnt_flags & MNT_NOATIME)
-			return;
+			goto out;
 		if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))
-			return;
-
+			goto out;
 		if (mnt->mnt_flags & MNT_RELATIME) {
 			/*
 			 * With relative atime, only update atime if the
@@ -1229,16 +1230,19 @@ void touch_atime(struct vfsmount *mnt, s
 						&inode->i_atime) < 0 &&
 			    timespec_compare(&inode->i_ctime,
 						&inode->i_atime) < 0)
-				return;
+				goto out;
 		}
 	}
 
 	now = current_fs_time(inode->i_sb);
 	if (timespec_equal(&inode->i_atime, &now))
-		return;
+		goto out;
 
 	inode->i_atime = now;
 	mark_inode_dirty_sync(inode);
+out:
+	if (mnt)
+		mnt_drop_write(mnt);
 }
 EXPORT_SYMBOL(touch_atime);
 
_
-
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