get rid of full-hash scan on detaching vfsmounts
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
Родитель
e9c5d8a562
Коммит
84d17192d2
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@ -18,6 +18,12 @@ struct mnt_pcp {
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int mnt_writers;
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};
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struct mountpoint {
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struct list_head m_hash;
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struct dentry *m_dentry;
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int m_count;
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};
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struct mount {
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struct list_head mnt_hash;
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struct mount *mnt_parent;
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@ -40,6 +46,7 @@ struct mount {
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struct list_head mnt_slave; /* slave list entry */
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struct mount *mnt_master; /* slave is on master->mnt_slave_list */
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struct mnt_namespace *mnt_ns; /* containing namespace */
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struct mountpoint *mnt_mp; /* where is it mounted */
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#ifdef CONFIG_FSNOTIFY
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struct hlist_head mnt_fsnotify_marks;
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__u32 mnt_fsnotify_mask;
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229
fs/namespace.c
229
fs/namespace.c
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@ -36,6 +36,7 @@ static int mnt_id_start = 0;
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static int mnt_group_start = 1;
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static struct list_head *mount_hashtable __read_mostly;
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static struct list_head *mountpoint_hashtable __read_mostly;
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static struct kmem_cache *mnt_cache __read_mostly;
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static struct rw_semaphore namespace_sem;
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@ -605,6 +606,51 @@ struct vfsmount *lookup_mnt(struct path *path)
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}
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}
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static struct mountpoint *new_mountpoint(struct dentry *dentry)
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{
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struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
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struct mountpoint *mp;
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list_for_each_entry(mp, chain, m_hash) {
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if (mp->m_dentry == dentry) {
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/* might be worth a WARN_ON() */
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if (d_unlinked(dentry))
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return ERR_PTR(-ENOENT);
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mp->m_count++;
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return mp;
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}
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}
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mp = kmalloc(sizeof(struct mountpoint), GFP_KERNEL);
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if (!mp)
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return ERR_PTR(-ENOMEM);
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spin_lock(&dentry->d_lock);
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if (d_unlinked(dentry)) {
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spin_unlock(&dentry->d_lock);
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kfree(mp);
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return ERR_PTR(-ENOENT);
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}
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dentry->d_flags |= DCACHE_MOUNTED;
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spin_unlock(&dentry->d_lock);
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mp->m_dentry = dentry;
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mp->m_count = 1;
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list_add(&mp->m_hash, chain);
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return mp;
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}
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static void put_mountpoint(struct mountpoint *mp)
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{
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if (!--mp->m_count) {
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struct dentry *dentry = mp->m_dentry;
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spin_lock(&dentry->d_lock);
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dentry->d_flags &= ~DCACHE_MOUNTED;
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spin_unlock(&dentry->d_lock);
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list_del(&mp->m_hash);
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kfree(mp);
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}
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}
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static inline int check_mnt(struct mount *mnt)
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{
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return mnt->mnt_ns == current->nsproxy->mnt_ns;
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@ -632,27 +678,6 @@ static void __touch_mnt_namespace(struct mnt_namespace *ns)
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}
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}
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/*
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* Clear dentry's mounted state if it has no remaining mounts.
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* vfsmount_lock must be held for write.
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*/
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static void dentry_reset_mounted(struct dentry *dentry)
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{
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unsigned u;
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for (u = 0; u < HASH_SIZE; u++) {
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struct mount *p;
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list_for_each_entry(p, &mount_hashtable[u], mnt_hash) {
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if (p->mnt_mountpoint == dentry)
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return;
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}
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}
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spin_lock(&dentry->d_lock);
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dentry->d_flags &= ~DCACHE_MOUNTED;
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spin_unlock(&dentry->d_lock);
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}
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/*
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* vfsmount lock must be held for write
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*/
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@ -664,32 +689,35 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
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mnt->mnt_mountpoint = mnt->mnt.mnt_root;
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list_del_init(&mnt->mnt_child);
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list_del_init(&mnt->mnt_hash);
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dentry_reset_mounted(old_path->dentry);
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put_mountpoint(mnt->mnt_mp);
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mnt->mnt_mp = NULL;
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}
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/*
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* vfsmount lock must be held for write
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*/
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void mnt_set_mountpoint(struct mount *mnt, struct dentry *dentry,
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void mnt_set_mountpoint(struct mount *mnt,
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struct mountpoint *mp,
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struct mount *child_mnt)
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{
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mp->m_count++;
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mnt_add_count(mnt, 1); /* essentially, that's mntget */
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child_mnt->mnt_mountpoint = dget(dentry);
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child_mnt->mnt_mountpoint = dget(mp->m_dentry);
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child_mnt->mnt_parent = mnt;
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spin_lock(&dentry->d_lock);
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dentry->d_flags |= DCACHE_MOUNTED;
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spin_unlock(&dentry->d_lock);
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child_mnt->mnt_mp = mp;
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}
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/*
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* vfsmount lock must be held for write
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*/
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static void attach_mnt(struct mount *mnt, struct path *path)
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static void attach_mnt(struct mount *mnt,
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struct mount *parent,
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struct mountpoint *mp)
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{
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mnt_set_mountpoint(real_mount(path->mnt), path->dentry, mnt);
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mnt_set_mountpoint(parent, mp, mnt);
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list_add_tail(&mnt->mnt_hash, mount_hashtable +
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hash(path->mnt, path->dentry));
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list_add_tail(&mnt->mnt_child, &real_mount(path->mnt)->mnt_mounts);
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hash(&parent->mnt, mp->m_dentry));
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list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
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}
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/*
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@ -1138,7 +1166,8 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
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list_del_init(&p->mnt_child);
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if (mnt_has_parent(p)) {
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p->mnt_parent->mnt_ghosts++;
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dentry_reset_mounted(p->mnt_mountpoint);
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put_mountpoint(p->mnt_mp);
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p->mnt_mp = NULL;
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}
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change_mnt_propagation(p, MS_PRIVATE);
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}
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@ -1323,8 +1352,7 @@ static bool mnt_ns_loop(struct path *path)
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struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
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int flag)
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{
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struct mount *res, *p, *q, *r;
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struct path path;
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struct mount *res, *p, *q, *r, *parent;
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if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(mnt))
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return ERR_PTR(-EINVAL);
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@ -1351,14 +1379,13 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
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q = q->mnt_parent;
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}
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p = s;
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path.mnt = &q->mnt;
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path.dentry = p->mnt_mountpoint;
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parent = q;
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q = clone_mnt(p, p->mnt.mnt_root, flag);
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if (IS_ERR(q))
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goto out;
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br_write_lock(&vfsmount_lock);
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list_add_tail(&q->mnt_list, &res->mnt_list);
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attach_mnt(q, &path);
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attach_mnt(q, parent, p->mnt_mp);
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br_write_unlock(&vfsmount_lock);
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}
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}
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@ -1505,11 +1532,11 @@ static int invent_group_ids(struct mount *mnt, bool recurse)
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* in allocations.
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*/
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static int attach_recursive_mnt(struct mount *source_mnt,
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struct path *path, struct path *parent_path)
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struct mount *dest_mnt,
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struct mountpoint *dest_mp,
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struct path *parent_path)
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{
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LIST_HEAD(tree_list);
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struct mount *dest_mnt = real_mount(path->mnt);
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struct dentry *dest_dentry = path->dentry;
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struct mount *child, *p;
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int err;
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@ -1518,7 +1545,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
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if (err)
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goto out;
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}
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err = propagate_mnt(dest_mnt, dest_dentry, source_mnt, &tree_list);
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err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
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if (err)
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goto out_cleanup_ids;
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@ -1530,10 +1557,10 @@ static int attach_recursive_mnt(struct mount *source_mnt,
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}
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if (parent_path) {
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detach_mnt(source_mnt, parent_path);
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attach_mnt(source_mnt, path);
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attach_mnt(source_mnt, dest_mnt, dest_mp);
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touch_mnt_namespace(source_mnt->mnt_ns);
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} else {
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mnt_set_mountpoint(dest_mnt, dest_dentry, source_mnt);
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mnt_set_mountpoint(dest_mnt, dest_mp, source_mnt);
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commit_tree(source_mnt);
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}
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@ -1552,46 +1579,53 @@ static int attach_recursive_mnt(struct mount *source_mnt,
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return err;
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}
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static int lock_mount(struct path *path)
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static struct mountpoint *lock_mount(struct path *path)
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{
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struct vfsmount *mnt;
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struct dentry *dentry = path->dentry;
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retry:
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mutex_lock(&path->dentry->d_inode->i_mutex);
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if (unlikely(cant_mount(path->dentry))) {
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mutex_unlock(&path->dentry->d_inode->i_mutex);
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return -ENOENT;
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mutex_lock(&dentry->d_inode->i_mutex);
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if (unlikely(cant_mount(dentry))) {
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mutex_unlock(&dentry->d_inode->i_mutex);
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return ERR_PTR(-ENOENT);
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}
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down_write(&namespace_sem);
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mnt = lookup_mnt(path);
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if (likely(!mnt))
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return 0;
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if (likely(!mnt)) {
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struct mountpoint *mp = new_mountpoint(dentry);
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if (IS_ERR(mp)) {
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up_write(&namespace_sem);
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mutex_unlock(&dentry->d_inode->i_mutex);
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return mp;
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}
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return mp;
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}
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up_write(&namespace_sem);
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mutex_unlock(&path->dentry->d_inode->i_mutex);
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path_put(path);
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path->mnt = mnt;
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path->dentry = dget(mnt->mnt_root);
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dentry = path->dentry = dget(mnt->mnt_root);
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goto retry;
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}
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static void unlock_mount(struct path *path)
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static void unlock_mount(struct mountpoint *where)
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{
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struct dentry *dentry = where->m_dentry;
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put_mountpoint(where);
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up_write(&namespace_sem);
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mutex_unlock(&path->dentry->d_inode->i_mutex);
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mutex_unlock(&dentry->d_inode->i_mutex);
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}
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static int graft_tree(struct mount *mnt, struct path *path)
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static int graft_tree(struct mount *mnt, struct mount *p, struct mountpoint *mp)
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{
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if (mnt->mnt.mnt_sb->s_flags & MS_NOUSER)
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return -EINVAL;
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if (S_ISDIR(path->dentry->d_inode->i_mode) !=
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if (S_ISDIR(mp->m_dentry->d_inode->i_mode) !=
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S_ISDIR(mnt->mnt.mnt_root->d_inode->i_mode))
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return -ENOTDIR;
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if (d_unlinked(path->dentry))
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return -ENOENT;
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return attach_recursive_mnt(mnt, path, NULL);
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return attach_recursive_mnt(mnt, p, mp, NULL);
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}
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/*
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@ -1654,7 +1688,8 @@ static int do_loopback(struct path *path, const char *old_name,
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{
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LIST_HEAD(umount_list);
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struct path old_path;
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struct mount *mnt = NULL, *old;
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struct mount *mnt = NULL, *old, *parent;
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struct mountpoint *mp;
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int err;
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if (!old_name || !*old_name)
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return -EINVAL;
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@ -1666,17 +1701,19 @@ static int do_loopback(struct path *path, const char *old_name,
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if (mnt_ns_loop(&old_path))
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goto out;
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err = lock_mount(path);
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if (err)
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mp = lock_mount(path);
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err = PTR_ERR(mp);
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if (IS_ERR(mp))
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goto out;
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old = real_mount(old_path.mnt);
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parent = real_mount(path->mnt);
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err = -EINVAL;
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if (IS_MNT_UNBINDABLE(old))
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goto out2;
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if (!check_mnt(real_mount(path->mnt)) || !check_mnt(old))
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if (!check_mnt(parent) || !check_mnt(old))
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goto out2;
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if (recurse)
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@ -1689,14 +1726,14 @@ static int do_loopback(struct path *path, const char *old_name,
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goto out2;
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}
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err = graft_tree(mnt, path);
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err = graft_tree(mnt, parent, mp);
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if (err) {
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br_write_lock(&vfsmount_lock);
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umount_tree(mnt, 0, &umount_list);
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br_write_unlock(&vfsmount_lock);
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}
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out2:
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unlock_mount(path);
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unlock_mount(mp);
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release_mounts(&umount_list);
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out:
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path_put(&old_path);
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@ -1779,6 +1816,7 @@ static int do_move_mount(struct path *path, const char *old_name)
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struct path old_path, parent_path;
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struct mount *p;
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struct mount *old;
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struct mountpoint *mp;
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int err;
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if (!old_name || !*old_name)
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return -EINVAL;
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@ -1786,8 +1824,9 @@ static int do_move_mount(struct path *path, const char *old_name)
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if (err)
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return err;
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err = lock_mount(path);
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if (err < 0)
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mp = lock_mount(path);
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err = PTR_ERR(mp);
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if (IS_ERR(mp))
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goto out;
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old = real_mount(old_path.mnt);
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@ -1797,9 +1836,6 @@ static int do_move_mount(struct path *path, const char *old_name)
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if (!check_mnt(p) || !check_mnt(old))
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goto out1;
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|
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if (d_unlinked(path->dentry))
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goto out1;
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err = -EINVAL;
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if (old_path.dentry != old_path.mnt->mnt_root)
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goto out1;
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|
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@ -1826,7 +1862,7 @@ static int do_move_mount(struct path *path, const char *old_name)
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if (p == old)
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goto out1;
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|
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err = attach_recursive_mnt(old, path, &parent_path);
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err = attach_recursive_mnt(old, real_mount(path->mnt), mp, &parent_path);
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if (err)
|
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goto out1;
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|
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|
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@ -1834,7 +1870,7 @@ static int do_move_mount(struct path *path, const char *old_name)
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* automatically */
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list_del_init(&old->mnt_expire);
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out1:
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unlock_mount(path);
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unlock_mount(mp);
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out:
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if (!err)
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path_put(&parent_path);
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|
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@ -1870,21 +1906,24 @@ static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype)
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*/
|
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static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
|
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{
|
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struct mountpoint *mp;
|
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struct mount *parent;
|
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int err;
|
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|
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mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL);
|
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|
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err = lock_mount(path);
|
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if (err)
|
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return err;
|
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mp = lock_mount(path);
|
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if (IS_ERR(mp))
|
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return PTR_ERR(mp);
|
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|
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parent = real_mount(path->mnt);
|
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err = -EINVAL;
|
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if (unlikely(!check_mnt(real_mount(path->mnt)))) {
|
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if (unlikely(!check_mnt(parent))) {
|
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/* that's acceptable only for automounts done in private ns */
|
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if (!(mnt_flags & MNT_SHRINKABLE))
|
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goto unlock;
|
||||
/* ... and for those we'd better have mountpoint still alive */
|
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if (!real_mount(path->mnt)->mnt_ns)
|
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if (!parent->mnt_ns)
|
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goto unlock;
|
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}
|
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|
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|
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@ -1899,10 +1938,10 @@ static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
|
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goto unlock;
|
||||
|
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newmnt->mnt.mnt_flags = mnt_flags;
|
||||
err = graft_tree(newmnt, path);
|
||||
err = graft_tree(newmnt, parent, mp);
|
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|
||||
unlock:
|
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unlock_mount(path);
|
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unlock_mount(mp);
|
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return err;
|
||||
}
|
||||
|
||||
|
|
@ -2543,7 +2582,8 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
|
|||
const char __user *, put_old)
|
||||
{
|
||||
struct path new, old, parent_path, root_parent, root;
|
||||
struct mount *new_mnt, *root_mnt;
|
||||
struct mount *new_mnt, *root_mnt, *old_mnt;
|
||||
struct mountpoint *old_mp, *root_mp;
|
||||
int error;
|
||||
|
||||
if (!may_mount())
|
||||
|
|
@ -2562,14 +2602,16 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
|
|||
goto out2;
|
||||
|
||||
get_fs_root(current->fs, &root);
|
||||
error = lock_mount(&old);
|
||||
if (error)
|
||||
old_mp = lock_mount(&old);
|
||||
error = PTR_ERR(old_mp);
|
||||
if (IS_ERR(old_mp))
|
||||
goto out3;
|
||||
|
||||
error = -EINVAL;
|
||||
new_mnt = real_mount(new.mnt);
|
||||
root_mnt = real_mount(root.mnt);
|
||||
if (IS_MNT_SHARED(real_mount(old.mnt)) ||
|
||||
old_mnt = real_mount(old.mnt);
|
||||
if (IS_MNT_SHARED(old_mnt) ||
|
||||
IS_MNT_SHARED(new_mnt->mnt_parent) ||
|
||||
IS_MNT_SHARED(root_mnt->mnt_parent))
|
||||
goto out4;
|
||||
|
|
@ -2578,37 +2620,37 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
|
|||
error = -ENOENT;
|
||||
if (d_unlinked(new.dentry))
|
||||
goto out4;
|
||||
if (d_unlinked(old.dentry))
|
||||
goto out4;
|
||||
error = -EBUSY;
|
||||
if (new.mnt == root.mnt ||
|
||||
old.mnt == root.mnt)
|
||||
if (new_mnt == root_mnt || old_mnt == root_mnt)
|
||||
goto out4; /* loop, on the same file system */
|
||||
error = -EINVAL;
|
||||
if (root.mnt->mnt_root != root.dentry)
|
||||
goto out4; /* not a mountpoint */
|
||||
if (!mnt_has_parent(root_mnt))
|
||||
goto out4; /* not attached */
|
||||
root_mp = root_mnt->mnt_mp;
|
||||
if (new.mnt->mnt_root != new.dentry)
|
||||
goto out4; /* not a mountpoint */
|
||||
if (!mnt_has_parent(new_mnt))
|
||||
goto out4; /* not attached */
|
||||
/* make sure we can reach put_old from new_root */
|
||||
if (!is_path_reachable(real_mount(old.mnt), old.dentry, &new))
|
||||
if (!is_path_reachable(old_mnt, old.dentry, &new))
|
||||
goto out4;
|
||||
root_mp->m_count++; /* pin it so it won't go away */
|
||||
br_write_lock(&vfsmount_lock);
|
||||
detach_mnt(new_mnt, &parent_path);
|
||||
detach_mnt(root_mnt, &root_parent);
|
||||
/* mount old root on put_old */
|
||||
attach_mnt(root_mnt, &old);
|
||||
attach_mnt(root_mnt, old_mnt, old_mp);
|
||||
/* mount new_root on / */
|
||||
attach_mnt(new_mnt, &root_parent);
|
||||
attach_mnt(new_mnt, real_mount(root_parent.mnt), root_mp);
|
||||
touch_mnt_namespace(current->nsproxy->mnt_ns);
|
||||
br_write_unlock(&vfsmount_lock);
|
||||
chroot_fs_refs(&root, &new);
|
||||
put_mountpoint(root_mp);
|
||||
error = 0;
|
||||
out4:
|
||||
unlock_mount(&old);
|
||||
unlock_mount(old_mp);
|
||||
if (!error) {
|
||||
path_put(&root_parent);
|
||||
path_put(&parent_path);
|
||||
|
|
@ -2663,14 +2705,17 @@ void __init mnt_init(void)
|
|||
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
|
||||
|
||||
mount_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC);
|
||||
mountpoint_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC);
|
||||
|
||||
if (!mount_hashtable)
|
||||
if (!mount_hashtable || !mountpoint_hashtable)
|
||||
panic("Failed to allocate mount hash table\n");
|
||||
|
||||
printk(KERN_INFO "Mount-cache hash table entries: %lu\n", HASH_SIZE);
|
||||
|
||||
for (u = 0; u < HASH_SIZE; u++)
|
||||
INIT_LIST_HEAD(&mount_hashtable[u]);
|
||||
for (u = 0; u < HASH_SIZE; u++)
|
||||
INIT_LIST_HEAD(&mountpoint_hashtable[u]);
|
||||
|
||||
br_lock_init(&vfsmount_lock);
|
||||
|
||||
|
|
|
|||
|
|
@ -217,7 +217,7 @@ static struct mount *get_source(struct mount *dest,
|
|||
* @source_mnt: source mount.
|
||||
* @tree_list : list of heads of trees to be attached.
|
||||
*/
|
||||
int propagate_mnt(struct mount *dest_mnt, struct dentry *dest_dentry,
|
||||
int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
|
||||
struct mount *source_mnt, struct list_head *tree_list)
|
||||
{
|
||||
struct mount *m, *child;
|
||||
|
|
@ -244,8 +244,8 @@ int propagate_mnt(struct mount *dest_mnt, struct dentry *dest_dentry,
|
|||
goto out;
|
||||
}
|
||||
|
||||
if (is_subdir(dest_dentry, m->mnt.mnt_root)) {
|
||||
mnt_set_mountpoint(m, dest_dentry, child);
|
||||
if (is_subdir(dest_mp->m_dentry, m->mnt.mnt_root)) {
|
||||
mnt_set_mountpoint(m, dest_mp, child);
|
||||
list_add_tail(&child->mnt_hash, tree_list);
|
||||
} else {
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -31,14 +31,14 @@ static inline void set_mnt_shared(struct mount *mnt)
|
|||
}
|
||||
|
||||
void change_mnt_propagation(struct mount *, int);
|
||||
int propagate_mnt(struct mount *, struct dentry *, struct mount *,
|
||||
int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
|
||||
struct list_head *);
|
||||
int propagate_umount(struct list_head *);
|
||||
int propagate_mount_busy(struct mount *, int);
|
||||
void mnt_release_group_id(struct mount *);
|
||||
int get_dominating_id(struct mount *mnt, const struct path *root);
|
||||
unsigned int mnt_get_count(struct mount *mnt);
|
||||
void mnt_set_mountpoint(struct mount *, struct dentry *,
|
||||
void mnt_set_mountpoint(struct mount *, struct mountpoint *,
|
||||
struct mount *);
|
||||
void release_mounts(struct list_head *);
|
||||
void umount_tree(struct mount *, int, struct list_head *);
|
||||
|
|
|
|||
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