diff options
| author | Dave Hansen <haveblue@us.ibm.com> | 2008-02-15 14:37:46 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-04-19 00:29:24 -0400 |
| commit | 42a74f206b914db13ee1f5ae932dcd91a77c8579 (patch) | |
| tree | 24e3dbe55edaacc750067ab9e01778255a6bff08 /fs/ocfs2 | |
| parent | 20ddee2c75339cc095f6191c3115f81da8955e96 (diff) | |
| download | lwn-42a74f206b914db13ee1f5ae932dcd91a77c8579.tar.gz lwn-42a74f206b914db13ee1f5ae932dcd91a77c8579.zip | |
[PATCH] r/o bind mounts: elevate write count for ioctls()
Some ioctl()s can cause writes to the filesystem. Take these, and make them
use mnt_want/drop_write() instead.
[AV: updated]
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ocfs2')
| -rw-r--r-- | fs/ocfs2/ioctl.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c index b413166dd163..7b142f0ce995 100644 --- a/fs/ocfs2/ioctl.c +++ b/fs/ocfs2/ioctl.c @@ -60,10 +60,6 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags, goto bail; } - status = -EROFS; - if (IS_RDONLY(inode)) - goto bail_unlock; - status = -EACCES; if (!is_owner_or_cap(inode)) goto bail_unlock; @@ -134,8 +130,13 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (get_user(flags, (int __user *) arg)) return -EFAULT; - return ocfs2_set_inode_attr(inode, flags, + status = mnt_want_write(filp->f_path.mnt); + if (status) + return status; + status = ocfs2_set_inode_attr(inode, flags, OCFS2_FL_MODIFIABLE); + mnt_drop_write(filp->f_path.mnt); + return status; case OCFS2_IOC_RESVSP: case OCFS2_IOC_RESVSP64: case OCFS2_IOC_UNRESVSP: |