*/
for_each_possible_cpu(cpu) {
struct mnt_writer *cpu_writer = &per_cpu(mnt_writers, cpu);
- if (cpu_writer->mnt != mnt)
- continue;
spin_lock(&cpu_writer->lock);
+ if (cpu_writer->mnt != mnt) {
+ spin_unlock(&cpu_writer->lock);
+ continue;
+ }
atomic_add(cpu_writer->count, &mnt->__mnt_writers);
cpu_writer->count = 0;
/*
* unixes. Our API is identical to OSF/1 to avoid making a mess of AMD
*/
-asmlinkage long sys_umount(char __user * name, int flags)
+SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
{
- struct nameidata nd;
+ struct path path;
int retval;
- retval = __user_walk(name, LOOKUP_FOLLOW, &nd);
+ retval = user_path(name, &path);
if (retval)
goto out;
retval = -EINVAL;
- if (nd.path.dentry != nd.path.mnt->mnt_root)
+ if (path.dentry != path.mnt->mnt_root)
goto dput_and_out;
- if (!check_mnt(nd.path.mnt))
+ if (!check_mnt(path.mnt))
goto dput_and_out;
retval = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto dput_and_out;
- retval = do_umount(nd.path.mnt, flags);
+ retval = do_umount(path.mnt, flags);
dput_and_out:
/* we mustn't call path_put() as that would clear mnt_expiry_mark */
- dput(nd.path.dentry);
- mntput_no_expire(nd.path.mnt);
+ dput(path.dentry);
+ mntput_no_expire(path.mnt);
out:
return retval;
}
/*
* The 2.0 compatible umount. No flags.
*/
-asmlinkage long sys_oldumount(char __user * name)
+SYSCALL_DEFINE1(oldumount, char __user *, name)
{
return sys_umount(name, 0);
}
#endif
-static int mount_is_safe(struct nameidata *nd)
+static int mount_is_safe(struct path *path)
{
if (capable(CAP_SYS_ADMIN))
return 0;
return -EPERM;
#ifdef notyet
- if (S_ISLNK(nd->path.dentry->d_inode->i_mode))
+ if (S_ISLNK(path->dentry->d_inode->i_mode))
return -EPERM;
- if (nd->path.dentry->d_inode->i_mode & S_ISVTX) {
- if (current->uid != nd->path.dentry->d_inode->i_uid)
+ if (path->dentry->d_inode->i_mode & S_ISVTX) {
+ if (current_uid() != path->dentry->d_inode->i_uid)
return -EPERM;
}
- if (vfs_permission(nd, MAY_WRITE))
+ if (inode_permission(path->dentry->d_inode, MAY_WRITE))
return -EPERM;
return 0;
#endif
/*
* recursively change the type of the mountpoint.
- * noinline this do_mount helper to save do_mount stack space.
*/
-static noinline int do_change_type(struct nameidata *nd, int flag)
+static int do_change_type(struct path *path, int flag)
{
- struct vfsmount *m, *mnt = nd->path.mnt;
+ struct vfsmount *m, *mnt = path->mnt;
int recurse = flag & MS_REC;
int type = flag & ~MS_REC;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (nd->path.dentry != nd->path.mnt->mnt_root)
+ if (path->dentry != path->mnt->mnt_root)
return -EINVAL;
down_write(&namespace_sem);
/*
* do loopback mount.
- * noinline this do_mount helper to save do_mount stack space.
*/
-static noinline int do_loopback(struct nameidata *nd, char *old_name,
+static int do_loopback(struct path *path, char *old_name,
int recurse)
{
- struct nameidata old_nd;
+ struct path old_path;
struct vfsmount *mnt = NULL;
- int err = mount_is_safe(nd);
+ int err = mount_is_safe(path);
if (err)
return err;
if (!old_name || !*old_name)
return -EINVAL;
- err = path_lookup(old_name, LOOKUP_FOLLOW, &old_nd);
+ err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
if (err)
return err;
down_write(&namespace_sem);
err = -EINVAL;
- if (IS_MNT_UNBINDABLE(old_nd.path.mnt))
+ if (IS_MNT_UNBINDABLE(old_path.mnt))
goto out;
- if (!check_mnt(nd->path.mnt) || !check_mnt(old_nd.path.mnt))
+ if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
goto out;
err = -ENOMEM;
if (recurse)
- mnt = copy_tree(old_nd.path.mnt, old_nd.path.dentry, 0);
+ mnt = copy_tree(old_path.mnt, old_path.dentry, 0);
else
- mnt = clone_mnt(old_nd.path.mnt, old_nd.path.dentry, 0);
+ mnt = clone_mnt(old_path.mnt, old_path.dentry, 0);
if (!mnt)
goto out;
- err = graft_tree(mnt, &nd->path);
+ err = graft_tree(mnt, path);
if (err) {
LIST_HEAD(umount_list);
spin_lock(&vfsmount_lock);
out:
up_write(&namespace_sem);
- path_put(&old_nd.path);
+ path_put(&old_path);
return err;
}
* change filesystem flags. dir should be a physical root of filesystem.
* If you've mounted a non-root directory somewhere and want to do remount
* on it - tough luck.
- * noinline this do_mount helper to save do_mount stack space.
*/
-static noinline int do_remount(struct nameidata *nd, int flags, int mnt_flags,
+static int do_remount(struct path *path, int flags, int mnt_flags,
void *data)
{
int err;
- struct super_block *sb = nd->path.mnt->mnt_sb;
+ struct super_block *sb = path->mnt->mnt_sb;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (!check_mnt(nd->path.mnt))
+ if (!check_mnt(path->mnt))
return -EINVAL;
- if (nd->path.dentry != nd->path.mnt->mnt_root)
+ if (path->dentry != path->mnt->mnt_root)
return -EINVAL;
down_write(&sb->s_umount);
if (flags & MS_BIND)
- err = change_mount_flags(nd->path.mnt, flags);
+ err = change_mount_flags(path->mnt, flags);
else
err = do_remount_sb(sb, flags, data, 0);
if (!err)
- nd->path.mnt->mnt_flags = mnt_flags;
+ path->mnt->mnt_flags = mnt_flags;
up_write(&sb->s_umount);
- if (!err)
- security_sb_post_remount(nd->path.mnt, flags, data);
+ if (!err) {
+ security_sb_post_remount(path->mnt, flags, data);
+
+ spin_lock(&vfsmount_lock);
+ touch_mnt_namespace(path->mnt->mnt_ns);
+ spin_unlock(&vfsmount_lock);
+ }
return err;
}
return 0;
}
-/*
- * noinline this do_mount helper to save do_mount stack space.
- */
-static noinline int do_move_mount(struct nameidata *nd, char *old_name)
+static int do_move_mount(struct path *path, char *old_name)
{
- struct nameidata old_nd;
- struct path parent_path;
+ struct path old_path, parent_path;
struct vfsmount *p;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!old_name || !*old_name)
return -EINVAL;
- err = path_lookup(old_name, LOOKUP_FOLLOW, &old_nd);
+ err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
if (err)
return err;
down_write(&namespace_sem);
- while (d_mountpoint(nd->path.dentry) &&
- follow_down(&nd->path.mnt, &nd->path.dentry))
+ while (d_mountpoint(path->dentry) &&
+ follow_down(&path->mnt, &path->dentry))
;
err = -EINVAL;
- if (!check_mnt(nd->path.mnt) || !check_mnt(old_nd.path.mnt))
+ if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
goto out;
err = -ENOENT;
- mutex_lock(&nd->path.dentry->d_inode->i_mutex);
- if (IS_DEADDIR(nd->path.dentry->d_inode))
+ mutex_lock(&path->dentry->d_inode->i_mutex);
+ if (IS_DEADDIR(path->dentry->d_inode))
goto out1;
- if (!IS_ROOT(nd->path.dentry) && d_unhashed(nd->path.dentry))
+ if (!IS_ROOT(path->dentry) && d_unhashed(path->dentry))
goto out1;
err = -EINVAL;
- if (old_nd.path.dentry != old_nd.path.mnt->mnt_root)
+ if (old_path.dentry != old_path.mnt->mnt_root)
goto out1;
- if (old_nd.path.mnt == old_nd.path.mnt->mnt_parent)
+ if (old_path.mnt == old_path.mnt->mnt_parent)
goto out1;
- if (S_ISDIR(nd->path.dentry->d_inode->i_mode) !=
- S_ISDIR(old_nd.path.dentry->d_inode->i_mode))
+ if (S_ISDIR(path->dentry->d_inode->i_mode) !=
+ S_ISDIR(old_path.dentry->d_inode->i_mode))
goto out1;
/*
* Don't move a mount residing in a shared parent.
*/
- if (old_nd.path.mnt->mnt_parent &&
- IS_MNT_SHARED(old_nd.path.mnt->mnt_parent))
+ if (old_path.mnt->mnt_parent &&
+ IS_MNT_SHARED(old_path.mnt->mnt_parent))
goto out1;
/*
* Don't move a mount tree containing unbindable mounts to a destination
* mount which is shared.
*/
- if (IS_MNT_SHARED(nd->path.mnt) &&
- tree_contains_unbindable(old_nd.path.mnt))
+ if (IS_MNT_SHARED(path->mnt) &&
+ tree_contains_unbindable(old_path.mnt))
goto out1;
err = -ELOOP;
- for (p = nd->path.mnt; p->mnt_parent != p; p = p->mnt_parent)
- if (p == old_nd.path.mnt)
+ for (p = path->mnt; p->mnt_parent != p; p = p->mnt_parent)
+ if (p == old_path.mnt)
goto out1;
- err = attach_recursive_mnt(old_nd.path.mnt, &nd->path, &parent_path);
+ err = attach_recursive_mnt(old_path.mnt, path, &parent_path);
if (err)
goto out1;
/* if the mount is moved, it should no longer be expire
* automatically */
- list_del_init(&old_nd.path.mnt->mnt_expire);
+ list_del_init(&old_path.mnt->mnt_expire);
out1:
- mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
+ mutex_unlock(&path->dentry->d_inode->i_mutex);
out:
up_write(&namespace_sem);
if (!err)
path_put(&parent_path);
- path_put(&old_nd.path);
+ path_put(&old_path);
return err;
}
/*
* create a new mount for userspace and request it to be added into the
* namespace's tree
- * noinline this do_mount helper to save do_mount stack space.
*/
-static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
+static int do_new_mount(struct path *path, char *type, int flags,
int mnt_flags, char *name, void *data)
{
struct vfsmount *mnt;
if (IS_ERR(mnt))
return PTR_ERR(mnt);
- return do_add_mount(mnt, nd, mnt_flags, NULL);
+ return do_add_mount(mnt, path, mnt_flags, NULL);
}
/*
* add a mount into a namespace's mount tree
* - provide the option of adding the new mount to an expiration list
*/
-int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
+int do_add_mount(struct vfsmount *newmnt, struct path *path,
int mnt_flags, struct list_head *fslist)
{
int err;
down_write(&namespace_sem);
/* Something was mounted here while we slept */
- while (d_mountpoint(nd->path.dentry) &&
- follow_down(&nd->path.mnt, &nd->path.dentry))
+ while (d_mountpoint(path->dentry) &&
+ follow_down(&path->mnt, &path->dentry))
;
err = -EINVAL;
- if (!check_mnt(nd->path.mnt))
+ if (!check_mnt(path->mnt))
goto unlock;
/* Refuse the same filesystem on the same mount point */
err = -EBUSY;
- if (nd->path.mnt->mnt_sb == newmnt->mnt_sb &&
- nd->path.mnt->mnt_root == nd->path.dentry)
+ if (path->mnt->mnt_sb == newmnt->mnt_sb &&
+ path->mnt->mnt_root == path->dentry)
goto unlock;
err = -EINVAL;
goto unlock;
newmnt->mnt_flags = mnt_flags;
- if ((err = graft_tree(newmnt, &nd->path)))
+ if ((err = graft_tree(newmnt, path)))
goto unlock;
if (fslist) /* add to the specified expiration list */
while (!list_empty(&graveyard)) {
m = list_first_entry(&graveyard, struct vfsmount,
mnt_expire);
- touch_mnt_namespace(mnt->mnt_ns);
- umount_tree(mnt, 1, umounts);
+ touch_mnt_namespace(m->mnt_ns);
+ umount_tree(m, 1, umounts);
}
}
}
long do_mount(char *dev_name, char *dir_name, char *type_page,
unsigned long flags, void *data_page)
{
- struct nameidata nd;
+ struct path path;
int retval = 0;
int mnt_flags = 0;
MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);
/* ... and get the mountpoint */
- retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
+ retval = kern_path(dir_name, LOOKUP_FOLLOW, &path);
if (retval)
return retval;
- retval = security_sb_mount(dev_name, &nd.path,
+ retval = security_sb_mount(dev_name, &path,
type_page, flags, data_page);
if (retval)
goto dput_out;
if (flags & MS_REMOUNT)
- retval = do_remount(&nd, flags & ~MS_REMOUNT, mnt_flags,
+ retval = do_remount(&path, flags & ~MS_REMOUNT, mnt_flags,
data_page);
else if (flags & MS_BIND)
- retval = do_loopback(&nd, dev_name, flags & MS_REC);
+ retval = do_loopback(&path, dev_name, flags & MS_REC);
else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
- retval = do_change_type(&nd, flags);
+ retval = do_change_type(&path, flags);
else if (flags & MS_MOVE)
- retval = do_move_mount(&nd, dev_name);
+ retval = do_move_mount(&path, dev_name);
else
- retval = do_new_mount(&nd, type_page, flags, mnt_flags,
+ retval = do_new_mount(&path, type_page, flags, mnt_flags,
dev_name, data_page);
dput_out:
- path_put(&nd.path);
+ path_put(&path);
return retval;
}
if (!new_ns->root) {
up_write(&namespace_sem);
kfree(new_ns);
- return ERR_PTR(-ENOMEM);;
+ return ERR_PTR(-ENOMEM);
}
spin_lock(&vfsmount_lock);
list_add_tail(&new_ns->list, &new_ns->root->mnt_list);
return new_ns;
}
-asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name,
- char __user * type, unsigned long flags,
- void __user * data)
+SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
+ char __user *, type, unsigned long, flags, void __user *, data)
{
int retval;
unsigned long data_page;
* though, so you may need to say mount --bind /nfs/my_root /nfs/my_root
* first.
*/
-asmlinkage long sys_pivot_root(const char __user * new_root,
- const char __user * put_old)
+SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
+ const char __user *, put_old)
{
struct vfsmount *tmp;
- struct nameidata new_nd, old_nd;
- struct path parent_path, root_parent, root;
+ struct path new, old, parent_path, root_parent, root;
int error;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- error = __user_walk(new_root, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
- &new_nd);
+ error = user_path_dir(new_root, &new);
if (error)
goto out0;
error = -EINVAL;
- if (!check_mnt(new_nd.path.mnt))
+ if (!check_mnt(new.mnt))
goto out1;
- error = __user_walk(put_old, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &old_nd);
+ error = user_path_dir(put_old, &old);
if (error)
goto out1;
- error = security_sb_pivotroot(&old_nd.path, &new_nd.path);
+ error = security_sb_pivotroot(&old, &new);
if (error) {
- path_put(&old_nd.path);
+ path_put(&old);
goto out1;
}
path_get(¤t->fs->root);
read_unlock(¤t->fs->lock);
down_write(&namespace_sem);
- mutex_lock(&old_nd.path.dentry->d_inode->i_mutex);
+ mutex_lock(&old.dentry->d_inode->i_mutex);
error = -EINVAL;
- if (IS_MNT_SHARED(old_nd.path.mnt) ||
- IS_MNT_SHARED(new_nd.path.mnt->mnt_parent) ||
+ if (IS_MNT_SHARED(old.mnt) ||
+ IS_MNT_SHARED(new.mnt->mnt_parent) ||
IS_MNT_SHARED(root.mnt->mnt_parent))
goto out2;
if (!check_mnt(root.mnt))
goto out2;
error = -ENOENT;
- if (IS_DEADDIR(new_nd.path.dentry->d_inode))
+ if (IS_DEADDIR(new.dentry->d_inode))
goto out2;
- if (d_unhashed(new_nd.path.dentry) && !IS_ROOT(new_nd.path.dentry))
+ if (d_unhashed(new.dentry) && !IS_ROOT(new.dentry))
goto out2;
- if (d_unhashed(old_nd.path.dentry) && !IS_ROOT(old_nd.path.dentry))
+ if (d_unhashed(old.dentry) && !IS_ROOT(old.dentry))
goto out2;
error = -EBUSY;
- if (new_nd.path.mnt == root.mnt ||
- old_nd.path.mnt == root.mnt)
+ if (new.mnt == root.mnt ||
+ old.mnt == root.mnt)
goto out2; /* loop, on the same file system */
error = -EINVAL;
if (root.mnt->mnt_root != root.dentry)
goto out2; /* not a mountpoint */
if (root.mnt->mnt_parent == root.mnt)
goto out2; /* not attached */
- if (new_nd.path.mnt->mnt_root != new_nd.path.dentry)
+ if (new.mnt->mnt_root != new.dentry)
goto out2; /* not a mountpoint */
- if (new_nd.path.mnt->mnt_parent == new_nd.path.mnt)
+ if (new.mnt->mnt_parent == new.mnt)
goto out2; /* not attached */
/* make sure we can reach put_old from new_root */
- tmp = old_nd.path.mnt;
+ tmp = old.mnt;
spin_lock(&vfsmount_lock);
- if (tmp != new_nd.path.mnt) {
+ if (tmp != new.mnt) {
for (;;) {
if (tmp->mnt_parent == tmp)
goto out3; /* already mounted on put_old */
- if (tmp->mnt_parent == new_nd.path.mnt)
+ if (tmp->mnt_parent == new.mnt)
break;
tmp = tmp->mnt_parent;
}
- if (!is_subdir(tmp->mnt_mountpoint, new_nd.path.dentry))
+ if (!is_subdir(tmp->mnt_mountpoint, new.dentry))
goto out3;
- } else if (!is_subdir(old_nd.path.dentry, new_nd.path.dentry))
+ } else if (!is_subdir(old.dentry, new.dentry))
goto out3;
- detach_mnt(new_nd.path.mnt, &parent_path);
+ detach_mnt(new.mnt, &parent_path);
detach_mnt(root.mnt, &root_parent);
/* mount old root on put_old */
- attach_mnt(root.mnt, &old_nd.path);
+ attach_mnt(root.mnt, &old);
/* mount new_root on / */
- attach_mnt(new_nd.path.mnt, &root_parent);
+ attach_mnt(new.mnt, &root_parent);
touch_mnt_namespace(current->nsproxy->mnt_ns);
spin_unlock(&vfsmount_lock);
- chroot_fs_refs(&root, &new_nd.path);
- security_sb_post_pivotroot(&root, &new_nd.path);
+ chroot_fs_refs(&root, &new);
+ security_sb_post_pivotroot(&root, &new);
error = 0;
path_put(&root_parent);
path_put(&parent_path);
out2:
- mutex_unlock(&old_nd.path.dentry->d_inode->i_mutex);
+ mutex_unlock(&old.dentry->d_inode->i_mutex);
up_write(&namespace_sem);
path_put(&root);
- path_put(&old_nd.path);
+ path_put(&old);
out1:
- path_put(&new_nd.path);
+ path_put(&new);
out0:
return error;
out3:
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff