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From: Dave Hansen <haveblue@us.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: hch@lst.de, miklos@szeredi.hu, akpm@osdl.org,
Dave Hansen <haveblue@us.ibm.com>
Subject: [PATCH 12/30] r/o bind mounts: elevate mnt_writers for unlink callers
Date: Fri, 15 Feb 2008 14:37:37 -0800 [thread overview]
Message-ID: <20080215223737.0C17BC2D@kernel> (raw)
In-Reply-To: <20080215223721.9E0A088A@kernel>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---
linux-2.6.git-dave/fs/namei.c | 4 ++++
linux-2.6.git-dave/ipc/mqueue.c | 5 ++++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff -puN fs/namei.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers fs/namei.c
--- linux-2.6.git/fs/namei.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers 2008-02-15 13:25:48.000000000 -0800
+++ linux-2.6.git-dave/fs/namei.c 2008-02-15 13:25:48.000000000 -0800
@@ -2280,7 +2280,11 @@ static long do_unlinkat(int dfd, const c
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto exit2;
error = vfs_unlink(nd.path.dentry->d_inode, dentry);
+ mnt_drop_write(nd.path.mnt);
exit2:
dput(dentry);
}
diff -puN ipc/mqueue.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers ipc/mqueue.c
--- linux-2.6.git/ipc/mqueue.c~r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers 2008-02-15 13:25:48.000000000 -0800
+++ linux-2.6.git-dave/ipc/mqueue.c 2008-02-15 13:25:48.000000000 -0800
@@ -742,8 +742,11 @@ asmlinkage long sys_mq_unlink(const char
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
-
+ err = mnt_want_write(mqueue_mnt);
+ if (err)
+ goto out_err;
err = vfs_unlink(dentry->d_parent->d_inode, dentry);
+ mnt_drop_write(mqueue_mnt);
out_err:
dput(dentry);
_
next prev parent reply other threads:[~2008-02-15 22:43 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 22:37 [PATCH 00/30] Read-only bind mounts (-mm resend) Dave Hansen
2008-02-15 22:37 ` [PATCH 01/30] reiserfs: eliminate private use of struct file in xattr Dave Hansen
2008-02-15 22:37 ` [PATCH 02/30] hppfs pass vfsmount to dentry_open() Dave Hansen
2008-02-15 22:37 ` [PATCH 03/30] check for null vfsmount in dentry_open() Dave Hansen
2008-02-15 22:37 ` [PATCH 04/30] fix up new filp allocators Dave Hansen
2008-02-15 22:37 ` [PATCH 05/30] do namei_flags calculation inside open_namei() Dave Hansen
2008-02-15 22:37 ` [PATCH 06/30] merge open_namei() and do_filp_open() Dave Hansen
2008-02-15 22:37 ` [PATCH 07/30] r/o bind mounts: stub functions Dave Hansen
2008-02-16 0:32 ` Theodore Tso
2008-02-16 0:49 ` Dave Hansen
2008-02-16 1:00 ` Theodore Tso
2008-02-16 1:11 ` Andrew Morton
2008-02-16 6:31 ` Christoph Hellwig
2008-02-16 6:46 ` Andrew Morton
2008-02-18 7:06 ` Dave Hansen
2008-02-20 22:25 ` Dave Hansen
2008-02-20 22:58 ` Christoph Hellwig
2008-02-15 22:37 ` [PATCH 08/30] r/o bind mounts: create helper to drop file write access Dave Hansen
2008-02-15 22:37 ` [PATCH 09/30] r/o bind mounts: drop write during emergency remount Dave Hansen
2008-02-18 16:29 ` Miklos Szeredi
2008-02-23 13:38 ` Al Viro
2008-02-15 22:37 ` [PATCH 10/30] r/o bind mounts: elevate write count for vfs_rmdir() Dave Hansen
2008-02-15 22:37 ` [PATCH 11/30] r/o bind mounts: elevate write count for callers of vfs_mkdir() Dave Hansen
2008-02-15 22:37 ` Dave Hansen [this message]
2008-02-15 22:37 ` [PATCH 13/30] r/o bind mounts: elevate write count for xattr_permission() callers Dave Hansen
2008-02-15 22:37 ` [PATCH 14/30] r/o bind mounts: elevate write count for ncp_ioctl() Dave Hansen
2008-02-15 22:37 ` [PATCH 15/30] r/o bind mounts: write counts for time functions Dave Hansen
2008-02-15 22:37 ` [PATCH 16/30] r/o bind mounts: elevate write count for do_utimes() Dave Hansen
2008-02-15 22:37 ` [PATCH 17/30] r/o bind mounts: write count for file_update_time() Dave Hansen
2008-02-15 22:37 ` [PATCH 18/30] r/o bind mounts: write counts for link/symlink Dave Hansen
2008-02-15 22:37 ` [PATCH 19/30] r/o bind mounts: elevate write count for ioctls() Dave Hansen
2008-02-15 22:37 ` [PATCH 20/30] r/o bind mounts: elevate write count for open()s Dave Hansen
2008-02-15 22:37 ` [PATCH 21/30] r/o bind mounts: get write access for vfs_rename() callers Dave Hansen
2008-02-15 22:37 ` [PATCH 22/30] r/o bind mounts: elevate write count for chmod/chown callers Dave Hansen
2008-02-15 22:37 ` [PATCH 23/30] r/o bind mounts: write counts for truncate() Dave Hansen
2008-02-15 22:37 ` [PATCH 24/30] r/o bind mounts: elevate count for xfs timestamp updates Dave Hansen
2008-02-15 22:37 ` [PATCH 25/30] r/o bind mounts: make access() use new r/o helper Dave Hansen
2008-02-15 22:37 ` [PATCH 26/30] r/o bind mounts: check mnt instead of superblock directly Dave Hansen
2008-02-15 22:37 ` [PATCH 27/30] r/o bind mounts: get callers of vfs_mknod/create() Dave Hansen
2008-02-15 22:37 ` [PATCH 28/30] r/o bind mounts: track numbers of writers to mounts Dave Hansen
2008-02-18 16:10 ` Miklos Szeredi
2008-02-20 21:12 ` Dave Hansen
2008-02-15 22:38 ` [PATCH 29/30] r/o bind mounts: honor mount writer counts at remount Dave Hansen
2008-02-15 22:38 ` [PATCH 30/30] r/o bind mounts: debugging for missed calls Dave Hansen
2008-02-16 1:32 ` [PATCH] r/o bind mounts: stub functions Dave Hansen
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