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-rw-r--r--fs/namespace.c57
1 files changed, 25 insertions, 32 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index c77eedd2ac6..ac19212c9bc 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -593,7 +593,7 @@ static int do_umount(struct vfsmount *mnt, int flags)
* (2) the usage count == 1 [parent vfsmount] + 1 [sys_umount]
*/
if (flags & MNT_EXPIRE) {
- if (mnt == current->fs->rootmnt ||
+ if (mnt == current->fs->root.mnt ||
flags & (MNT_FORCE | MNT_DETACH))
return -EINVAL;
@@ -628,7 +628,7 @@ static int do_umount(struct vfsmount *mnt, int flags)
* /reboot - static binary that would close all descriptors and
* call reboot(9). Then init(8) could umount root and exec /reboot.
*/
- if (mnt == current->fs->rootmnt && !(flags & MNT_DETACH)) {
+ if (mnt == current->fs->root.mnt && !(flags & MNT_DETACH)) {
/*
* Special case for "unmounting" root ...
* we just try to remount it readonly.
@@ -1559,17 +1559,17 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
while (p) {
q->mnt_ns = new_ns;
if (fs) {
- if (p == fs->rootmnt) {
+ if (p == fs->root.mnt) {
rootmnt = p;
- fs->rootmnt = mntget(q);
+ fs->root.mnt = mntget(q);
}
- if (p == fs->pwdmnt) {
+ if (p == fs->pwd.mnt) {
pwdmnt = p;
- fs->pwdmnt = mntget(q);
+ fs->pwd.mnt = mntget(q);
}
- if (p == fs->altrootmnt) {
+ if (p == fs->altroot.mnt) {
altrootmnt = p;
- fs->altrootmnt = mntget(q);
+ fs->altroot.mnt = mntget(q);
}
}
p = next_mnt(p, mnt_ns->root);
@@ -1653,18 +1653,15 @@ out1:
void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
struct dentry *dentry)
{
- struct dentry *old_root;
- struct vfsmount *old_rootmnt;
+ struct path old_root;
+
write_lock(&fs->lock);
old_root = fs->root;
- old_rootmnt = fs->rootmnt;
- fs->rootmnt = mntget(mnt);
- fs->root = dget(dentry);
+ fs->root.mnt = mntget(mnt);
+ fs->root.dentry = dget(dentry);
write_unlock(&fs->lock);
- if (old_root) {
- dput(old_root);
- mntput(old_rootmnt);
- }
+ if (old_root.dentry)
+ path_put(&old_root);
}
/*
@@ -1674,20 +1671,16 @@ void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
void set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
struct dentry *dentry)
{
- struct dentry *old_pwd;
- struct vfsmount *old_pwdmnt;
+ struct path old_pwd;
write_lock(&fs->lock);
old_pwd = fs->pwd;
- old_pwdmnt = fs->pwdmnt;
- fs->pwdmnt = mntget(mnt);
- fs->pwd = dget(dentry);
+ fs->pwd.mnt = mntget(mnt);
+ fs->pwd.dentry = dget(dentry);
write_unlock(&fs->lock);
- if (old_pwd) {
- dput(old_pwd);
- mntput(old_pwdmnt);
- }
+ if (old_pwd.dentry)
+ path_put(&old_pwd);
}
static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
@@ -1702,12 +1695,12 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
if (fs) {
atomic_inc(&fs->count);
task_unlock(p);
- if (fs->root == old_nd->path.dentry
- && fs->rootmnt == old_nd->path.mnt)
+ 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);
- if (fs->pwd == old_nd->path.dentry
- && fs->pwdmnt == old_nd->path.mnt)
+ 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);
put_fs_struct(fs);
@@ -1773,8 +1766,8 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
}
read_lock(&current->fs->lock);
- user_nd.path.mnt = mntget(current->fs->rootmnt);
- user_nd.path.dentry = dget(current->fs->root);
+ user_nd.path = current->fs->root;
+ path_get(&current->fs->root);
read_unlock(&current->fs->lock);
down_write(&namespace_sem);
mutex_lock(&old_nd.path.dentry->d_inode->i_mutex);