linux-kernel - [PATCH 22/28] elevate write count for do

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Date:	Tue, 01 Aug 2006 16:52:56 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	viro@....linux.org.uk, herbert@...hfloor.at, hch@...radead.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 22/28] elevate write count for do_utimes()



Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---

 lxc-dave/fs/open.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff -puN fs/open.c~C-elevate-writers-opens-part2-do_utimes fs/open.c
--- lxc/fs/open.c~C-elevate-writers-opens-part2-do_utimes	2006-08-01 16:35:29.000000000 -0700
+++ lxc-dave/fs/open.c	2006-08-01 16:35:29.000000000 -0700
@@ -441,16 +441,19 @@ long do_utimes(int dfd, char __user *fil
 		goto out;
 	inode = nd.dentry->d_inode;
 
+	error = mnt_want_write(nd.mnt);
+	if (error)
+		goto dput_and_out;
 	error = -EROFS;
 	if (IS_RDONLY(inode))
-		goto dput_and_out;
+		goto mnt_drop_write_and_out;
 
 	/* Don't worry, the checks are done in inode_change_ok() */
 	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
 	if (times) {
 		error = -EPERM;
                 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-                        goto dput_and_out;
+			goto mnt_drop_write_and_out;
 
 		newattrs.ia_atime.tv_sec = times[0].tv_sec;
 		newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
@@ -460,15 +463,17 @@ long do_utimes(int dfd, char __user *fil
 	} else {
 		error = -EACCES;
                 if (IS_IMMUTABLE(inode))
-                        goto dput_and_out;
+			goto mnt_drop_write_and_out;
 
 		if (current->fsuid != inode->i_uid &&
 		    (error = vfs_permission(&nd, MAY_WRITE)) != 0)
-			goto dput_and_out;
+			goto mnt_drop_write_and_out;
 	}
 	mutex_lock(&inode->i_mutex);
 	error = notify_change(nd.dentry, &newattrs);
 	mutex_unlock(&inode->i_mutex);
+mnt_drop_write_and_out:
+	mnt_drop_write(nd.mnt);
 dput_and_out:
 	path_release(&nd);
 out:
_
-
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