diff options
Diffstat (limited to 'fs/namespace.c')
| -rw-r--r-- | fs/namespace.c | 60 |
1 files changed, 25 insertions, 35 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index cd1e9681a0cf..82ef1405260e 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -190,6 +190,14 @@ unsigned int mnt_get_count(struct mount *mnt) #endif } +static void drop_mountpoint(struct fs_pin *p) +{ + struct mount *m = container_of(p, struct mount, mnt_umount); + dput(m->mnt_ex_mountpoint); + pin_remove(p); + mntput(&m->mnt); +} + static struct mount *alloc_vfsmnt(const char *name) { struct mount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL); @@ -201,7 +209,7 @@ static struct mount *alloc_vfsmnt(const char *name) goto out_free_cache; if (name) { - mnt->mnt_devname = kstrdup(name, GFP_KERNEL); + mnt->mnt_devname = kstrdup_const(name, GFP_KERNEL); if (!mnt->mnt_devname) goto out_free_id; } @@ -229,12 +237,13 @@ static struct mount *alloc_vfsmnt(const char *name) #ifdef CONFIG_FSNOTIFY INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks); #endif + init_fs_pin(&mnt->mnt_umount, drop_mountpoint); } return mnt; #ifdef CONFIG_SMP out_free_devname: - kfree(mnt->mnt_devname); + kfree_const(mnt->mnt_devname); #endif out_free_id: mnt_free_id(mnt); @@ -568,7 +577,7 @@ int sb_prepare_remount_readonly(struct super_block *sb) static void free_vfsmnt(struct mount *mnt) { - kfree(mnt->mnt_devname); + kfree_const(mnt->mnt_devname); #ifdef CONFIG_SMP free_percpu(mnt->mnt_pcp); #endif @@ -1289,7 +1298,6 @@ static HLIST_HEAD(unmounted); /* protected by namespace_sem */ static void namespace_unlock(void) { - struct mount *mnt; struct hlist_head head = unmounted; if (likely(hlist_empty(&head))) { @@ -1299,23 +1307,11 @@ static void namespace_unlock(void) head.first->pprev = &head.first; INIT_HLIST_HEAD(&unmounted); - - /* undo decrements we'd done in umount_tree() */ - hlist_for_each_entry(mnt, &head, mnt_hash) - if (mnt->mnt_ex_mountpoint.mnt) - mntget(mnt->mnt_ex_mountpoint.mnt); - up_write(&namespace_sem); synchronize_rcu(); - while (!hlist_empty(&head)) { - mnt = hlist_entry(head.first, struct mount, mnt_hash); - hlist_del_init(&mnt->mnt_hash); - if (mnt->mnt_ex_mountpoint.mnt) - path_put(&mnt->mnt_ex_mountpoint); - mntput(&mnt->mnt); - } + group_pin_kill(&head); } static inline void namespace_lock(void) @@ -1334,7 +1330,6 @@ void umount_tree(struct mount *mnt, int how) { HLIST_HEAD(tmp_list); struct mount *p; - struct mount *last = NULL; for (p = mnt; p; p = next_mnt(p, mnt)) { hlist_del_init_rcu(&p->mnt_hash); @@ -1347,33 +1342,28 @@ void umount_tree(struct mount *mnt, int how) if (how) propagate_umount(&tmp_list); - hlist_for_each_entry(p, &tmp_list, mnt_hash) { + while (!hlist_empty(&tmp_list)) { + p = hlist_entry(tmp_list.first, struct mount, mnt_hash); + hlist_del_init_rcu(&p->mnt_hash); list_del_init(&p->mnt_expire); list_del_init(&p->mnt_list); __touch_mnt_namespace(p->mnt_ns); p->mnt_ns = NULL; if (how < 2) p->mnt.mnt_flags |= MNT_SYNC_UMOUNT; + + pin_insert_group(&p->mnt_umount, &p->mnt_parent->mnt, &unmounted); if (mnt_has_parent(p)) { hlist_del_init(&p->mnt_mp_list); put_mountpoint(p->mnt_mp); mnt_add_count(p->mnt_parent, -1); - /* move the reference to mountpoint into ->mnt_ex_mountpoint */ - p->mnt_ex_mountpoint.dentry = p->mnt_mountpoint; - p->mnt_ex_mountpoint.mnt = &p->mnt_parent->mnt; + /* old mountpoint will be dropped when we can do that */ + p->mnt_ex_mountpoint = p->mnt_mountpoint; p->mnt_mountpoint = p->mnt.mnt_root; p->mnt_parent = p; p->mnt_mp = NULL; } change_mnt_propagation(p, MS_PRIVATE); - last = p; - } - if (last) { - last->mnt_hash.next = unmounted.first; - if (unmounted.first) - unmounted.first->pprev = &last->mnt_hash.next; - unmounted.first = tmp_list.first; - unmounted.first->pprev = &unmounted.first; } } @@ -1917,8 +1907,8 @@ static int graft_tree(struct mount *mnt, struct mount *p, struct mountpoint *mp) if (mnt->mnt.mnt_sb->s_flags & MS_NOUSER) return -EINVAL; - if (S_ISDIR(mp->m_dentry->d_inode->i_mode) != - S_ISDIR(mnt->mnt.mnt_root->d_inode->i_mode)) + if (d_is_dir(mp->m_dentry) != + d_is_dir(mnt->mnt.mnt_root)) return -ENOTDIR; return attach_recursive_mnt(mnt, p, mp, NULL); @@ -2190,8 +2180,8 @@ static int do_move_mount(struct path *path, const char *old_name) if (!mnt_has_parent(old)) goto out1; - if (S_ISDIR(path->dentry->d_inode->i_mode) != - S_ISDIR(old_path.dentry->d_inode->i_mode)) + if (d_is_dir(path->dentry) != + d_is_dir(old_path.dentry)) goto out1; /* * Don't move a mount residing in a shared parent. @@ -2281,7 +2271,7 @@ static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags) goto unlock; err = -EINVAL; - if (S_ISLNK(newmnt->mnt.mnt_root->d_inode->i_mode)) + if (d_is_symlink(newmnt->mnt.mnt_root)) goto unlock; newmnt->mnt.mnt_flags = mnt_flags; |