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Message-Id: <20070209225340.765CBDFD@localhost.localdomain>
Date: Fri, 09 Feb 2007 14:53:40 -0800
From: Dave Hansen <hansendc@...ibm.com>
To: linux-kernel@...r.kernel.org
Cc: akpm@...l.org, hch@...radead.org, Dave Hansen <hansendc@...ibm.com>
Subject: [PATCH 16/22] sys_mknodat(): elevate write count for vfs_mknod/create()
This takes care of all of the direct callers of vfs_mknod().
Since a few of these cases also handle normal file creation
as well, this also covers some calls to vfs_create().
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---
lxc-dave/fs/namei.c | 12 ++++++++++++
lxc-dave/fs/nfsd/vfs.c | 4 ++++
lxc-dave/net/unix/af_unix.c | 4 ++++
3 files changed, 20 insertions(+)
diff -puN fs/namei.c~18-24-sys-mknodat-elevate-write-count-for-vfs-mknod-create fs/namei.c
--- lxc/fs/namei.c~18-24-sys-mknodat-elevate-write-count-for-vfs-mknod-create 2007-02-09 14:26:57.000000000 -0800
+++ lxc-dave/fs/namei.c 2007-02-09 14:26:57.000000000 -0800
@@ -1903,14 +1903,26 @@ asmlinkage long sys_mknodat(int dfd, con
if (!IS_ERR(dentry)) {
switch (mode & S_IFMT) {
case 0: case S_IFREG:
+ error = mnt_want_write(nd.mnt);
+ if (error)
+ break;
error = vfs_create(nd.dentry->d_inode,dentry,mode,&nd);
+ mnt_drop_write(nd.mnt);
break;
case S_IFCHR: case S_IFBLK:
+ error = mnt_want_write(nd.mnt);
+ if (error)
+ break;
error = vfs_mknod(nd.dentry->d_inode,dentry,mode,
new_decode_dev(dev));
+ mnt_drop_write(nd.mnt);
break;
case S_IFIFO: case S_IFSOCK:
+ error = mnt_want_write(nd.mnt);
+ if (error)
+ break;
error = vfs_mknod(nd.dentry->d_inode,dentry,mode,0);
+ mnt_drop_write(nd.mnt);
break;
case S_IFDIR:
error = -EPERM;
diff -puN fs/nfsd/vfs.c~18-24-sys-mknodat-elevate-write-count-for-vfs-mknod-create fs/nfsd/vfs.c
--- lxc/fs/nfsd/vfs.c~18-24-sys-mknodat-elevate-write-count-for-vfs-mknod-create 2007-02-09 14:26:57.000000000 -0800
+++ lxc-dave/fs/nfsd/vfs.c 2007-02-09 14:26:57.000000000 -0800
@@ -664,6 +664,9 @@ nfsd_open(struct svc_rqst *rqstp, struct
/* Disallow write access to files with the append-only bit set
* or any access when mandatory locking enabled
*/
+ err = mnt_want_write(fhp->fh_export->ex_mnt);
+ if (err)
+ goto out_nfserr;
err = nfserr_perm;
if (IS_APPEND(inode) && (access & MAY_WRITE))
goto out;
@@ -1199,6 +1202,7 @@ nfsd_create(struct svc_rqst *rqstp, stru
printk("nfsd: bad file type %o in nfsd_create\n", type);
host_err = -EINVAL;
}
+ mnt_drop_write(fhp->fh_export->ex_mnt);
if (host_err < 0)
goto out_nfserr;
diff -puN net/unix/af_unix.c~18-24-sys-mknodat-elevate-write-count-for-vfs-mknod-create net/unix/af_unix.c
--- lxc/net/unix/af_unix.c~18-24-sys-mknodat-elevate-write-count-for-vfs-mknod-create 2007-02-09 14:26:57.000000000 -0800
+++ lxc-dave/net/unix/af_unix.c 2007-02-09 14:26:57.000000000 -0800
@@ -816,7 +816,11 @@ static int unix_bind(struct socket *sock
*/
mode = S_IFSOCK |
(SOCK_INODE(sock)->i_mode & ~current->fs->umask);
+ err = mnt_want_write(nd.mnt);
+ if (err)
+ goto out_mknod_dput;
err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0);
+ mnt_drop_write(nd.mnt);
if (err)
goto out_mknod_dput;
mutex_unlock(&nd.dentry->d_inode->i_mutex);
_
-
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