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Message-ID: <20071022070202.GK6489@in.ibm.com>
Date: Mon, 22 Oct 2007 12:32:02 +0530
From: Bharata B Rao <bharata@...ux.vnet.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jan Blunck <jblunck@...e.de>, Andreas Gruenbacher <agruen@...e.de>,
Christoph Hellwig <hch@....de>, viro@...iv.linux.org.uk,
linux-kernel@...r.kernel.org
Subject: [PATCH 10/13] Make set_fs_{root,pwd} take a struct path
From: Jan Blunck <jblunck@...e.de>
In nearly all cases the set_fs_{root,pwd}() calls work on a struct
path. Change the function to reflect this and use path_get() here.
Signed-off-by: Jan Blunck <jblunck@...e.de>
Signed-off-by: Andreas Gruenbacher <agruen@...e.de>
Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
Acked-by: Christoph Hellwig <hch@....de>
---
fs/namespace.c | 28 ++++++++++++++--------------
fs/open.c | 12 ++++--------
include/linux/fs_struct.h | 4 ++--
3 files changed, 20 insertions(+), 24 deletions(-)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2040,15 +2040,14 @@ out1:
* Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values.
* It can block. Requires the big lock held.
*/
-void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
- struct dentry *dentry)
+void set_fs_root(struct fs_struct *fs, struct path *path)
{
struct path old_root;
write_lock(&fs->lock);
old_root = fs->root;
- fs->root.mnt = mntget(mnt);
- fs->root.dentry = dget(dentry);
+ fs->root = *path;
+ path_get(path);
write_unlock(&fs->lock);
if (old_root.dentry)
path_put(&old_root);
@@ -2058,15 +2057,14 @@ void set_fs_root(struct fs_struct *fs, s
* Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values.
* It can block. Requires the big lock held.
*/
-void set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
- struct dentry *dentry)
+void set_fs_pwd(struct fs_struct *fs, struct path *path)
{
struct path old_pwd;
write_lock(&fs->lock);
old_pwd = fs->pwd;
- fs->pwd.mnt = mntget(mnt);
- fs->pwd.dentry = dget(dentry);
+ fs->pwd = *path;
+ path_get(path);
write_unlock(&fs->lock);
if (old_pwd.dentry)
@@ -2087,12 +2085,10 @@ static void chroot_fs_refs(struct nameid
task_unlock(p);
if (fs->root.dentry == old_nd->path.dentry
&& fs->root.mnt == old_nd->path.mnt)
- set_fs_root(fs, new_nd->path.mnt,
- new_nd->path.dentry);
+ set_fs_root(fs, &new_nd->path);
if (fs->pwd.dentry == old_nd->path.dentry
&& fs->pwd.mnt == old_nd->path.mnt)
- set_fs_pwd(fs, new_nd->path.mnt,
- new_nd->path.dentry);
+ set_fs_pwd(fs, &new_nd->path);
put_fs_struct(fs);
} else
task_unlock(p);
@@ -2235,6 +2231,7 @@ static void __init init_mount_tree(void)
{
struct vfsmount *mnt;
struct mnt_namespace *ns;
+ struct path root;
mnt = do_kern_mount("rootfs", 0, "rootfs", NULL);
if (IS_ERR(mnt))
@@ -2253,8 +2250,11 @@ static void __init init_mount_tree(void)
init_task.nsproxy->mnt_ns = ns;
get_mnt_ns(ns);
- set_fs_pwd(current->fs, ns->root, ns->root->mnt_root);
- set_fs_root(current->fs, ns->root, ns->root->mnt_root);
+ root.mnt = ns->root;
+ root.dentry = ns->root->mnt_root;
+
+ set_fs_pwd(current->fs, &root);
+ set_fs_root(current->fs, &root);
}
void __init mnt_init(void)
--- a/fs/open.c
+++ b/fs/open.c
@@ -501,7 +501,7 @@ asmlinkage long sys_chdir(const char __u
if (error)
goto dput_and_out;
- set_fs_pwd(current->fs, nd.path.mnt, nd.path.dentry);
+ set_fs_pwd(current->fs, &nd.path);
dput_and_out:
path_put(&nd.path);
@@ -512,9 +512,7 @@ out:
asmlinkage long sys_fchdir(unsigned int fd)
{
struct file *file;
- struct dentry *dentry;
struct inode *inode;
- struct vfsmount *mnt;
int error;
error = -EBADF;
@@ -522,9 +520,7 @@ asmlinkage long sys_fchdir(unsigned int
if (!file)
goto out;
- dentry = file->f_path.dentry;
- mnt = file->f_path.mnt;
- inode = dentry->d_inode;
+ inode = file->f_path.dentry->d_inode;
error = -ENOTDIR;
if (!S_ISDIR(inode->i_mode))
@@ -532,7 +528,7 @@ asmlinkage long sys_fchdir(unsigned int
error = file_permission(file, MAY_EXEC);
if (!error)
- set_fs_pwd(current->fs, mnt, dentry);
+ set_fs_pwd(current->fs, &file->f_path);
out_putf:
fput(file);
out:
@@ -556,7 +552,7 @@ asmlinkage long sys_chroot(const char __
if (!capable(CAP_SYS_CHROOT))
goto dput_and_out;
- set_fs_root(current->fs, nd.path.mnt, nd.path.dentry);
+ set_fs_root(current->fs, &nd.path);
set_fs_altroot();
error = 0;
dput_and_out:
--- a/include/linux/fs_struct.h
+++ b/include/linux/fs_struct.h
@@ -20,8 +20,8 @@ extern struct kmem_cache *fs_cachep;
extern void exit_fs(struct task_struct *);
extern void set_fs_altroot(void);
-extern void set_fs_root(struct fs_struct *, struct vfsmount *, struct dentry *);
-extern void set_fs_pwd(struct fs_struct *, struct vfsmount *, struct dentry *);
+extern void set_fs_root(struct fs_struct *, struct path *);
+extern void set_fs_pwd(struct fs_struct *, struct path *);
extern struct fs_struct *copy_fs_struct(struct fs_struct *);
extern void put_fs_struct(struct fs_struct *);
-
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