mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 02:10:52 +07:00
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
parent
e9c5d8a562
commit
84d17192d2
@ -18,6 +18,12 @@ struct mnt_pcp {
|
||||
int mnt_writers;
|
||||
};
|
||||
|
||||
struct mountpoint {
|
||||
struct list_head m_hash;
|
||||
struct dentry *m_dentry;
|
||||
int m_count;
|
||||
};
|
||||
|
||||
struct mount {
|
||||
struct list_head mnt_hash;
|
||||
struct mount *mnt_parent;
|
||||
@ -40,6 +46,7 @@ struct mount {
|
||||
struct list_head mnt_slave; /* slave list entry */
|
||||
struct mount *mnt_master; /* slave is on master->mnt_slave_list */
|
||||
struct mnt_namespace *mnt_ns; /* containing namespace */
|
||||
struct mountpoint *mnt_mp; /* where is it mounted */
|
||||
#ifdef CONFIG_FSNOTIFY
|
||||
struct hlist_head mnt_fsnotify_marks;
|
||||
__u32 mnt_fsnotify_mask;
|
||||
|
||||
229
fs/namespace.c
229
fs/namespace.c
@ -36,6 +36,7 @@ static int mnt_id_start = 0;
|
||||
static int mnt_group_start = 1;
|
||||
|
||||
static struct list_head *mount_hashtable __read_mostly;
|
||||
static struct list_head *mountpoint_hashtable __read_mostly;
|
||||
static struct kmem_cache *mnt_cache __read_mostly;
|
||||
static struct rw_semaphore namespace_sem;
|
||||
|
||||
@ -605,6 +606,51 @@ struct vfsmount *lookup_mnt(struct path *path)
|
||||
}
|
||||
}
|
||||
|
||||
static struct mountpoint *new_mountpoint(struct dentry *dentry)
|
||||
{
|
||||
struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
|
||||
struct mountpoint *mp;
|
||||
|
||||
list_for_each_entry(mp, chain, m_hash) {
|
||||
if (mp->m_dentry == dentry) {
|
||||
/* might be worth a WARN_ON() */
|
||||
if (d_unlinked(dentry))
|
||||
return ERR_PTR(-ENOENT);
|
||||
mp->m_count++;
|
||||
return mp;
|
||||
}
|
||||
}
|
||||
|
||||
mp = kmalloc(sizeof(struct mountpoint), GFP_KERNEL);
|
||||
if (!mp)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
spin_lock(&dentry->d_lock);
|
||||
if (d_unlinked(dentry)) {
|
||||
spin_unlock(&dentry->d_lock);
|
||||
kfree(mp);
|
||||
return ERR_PTR(-ENOENT);
|
||||
}
|
||||
dentry->d_flags |= DCACHE_MOUNTED;
|
||||
spin_unlock(&dentry->d_lock);
|
||||
mp->m_dentry = dentry;
|
||||
mp->m_count = 1;
|
||||
list_add(&mp->m_hash, chain);
|
||||
return mp;
|
||||
}
|
||||
|
||||
static void put_mountpoint(struct mountpoint *mp)
|
||||
{
|
||||
if (!--mp->m_count) {
|
||||
struct dentry *dentry = mp->m_dentry;
|
||||
spin_lock(&dentry->d_lock);
|
||||
dentry->d_flags &= ~DCACHE_MOUNTED;
|
||||
spin_unlock(&dentry->d_lock);
|
||||
list_del(&mp->m_hash);
|
||||
kfree(mp);
|
||||
}
|
||||
}
|
||||
|
||||
static inline int check_mnt(struct mount *mnt)
|
||||
{
|
||||
return mnt->mnt_ns == current->nsproxy->mnt_ns;
|
||||
@ -632,27 +678,6 @@ static void __touch_mnt_namespace(struct mnt_namespace *ns)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Clear dentry's mounted state if it has no remaining mounts.
|
||||
* vfsmount_lock must be held for write.
|
||||
*/
|
||||
static void dentry_reset_mounted(struct dentry *dentry)
|
||||
{
|
||||
unsigned u;
|
||||
|
||||
for (u = 0; u < HASH_SIZE; u++) {
|
||||
struct mount *p;
|
||||
|
||||
list_for_each_entry(p, &mount_hashtable[u], mnt_hash) {
|
||||
if (p->mnt_mountpoint == dentry)
|
||||
return;
|
||||
}
|
||||
}
|
||||
spin_lock(&dentry->d_lock);
|
||||
dentry->d_flags &= ~DCACHE_MOUNTED;
|
||||
spin_unlock(&dentry->d_lock);
|
||||
}
|
||||
|
||||
/*
|
||||
* vfsmount lock must be held for write
|
||||
*/
|
||||
@ -664,32 +689,35 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
|
||||
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
|
||||
list_del_init(&mnt->mnt_child);
|
||||
list_del_init(&mnt->mnt_hash);
|
||||
dentry_reset_mounted(old_path->dentry);
|
||||
put_mountpoint(mnt->mnt_mp);
|
||||
mnt->mnt_mp = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* vfsmount lock must be held for write
|
||||
*/
|
||||
void mnt_set_mountpoint(struct mount *mnt, struct dentry *dentry,
|
||||
void mnt_set_mountpoint(struct mount *mnt,
|
||||
struct mountpoint *mp,
|
||||
struct mount *child_mnt)
|
||||
{
|
||||
mp->m_count++;
|
||||
mnt_add_count(mnt, 1); /* essentially, that's mntget */
|
||||
child_mnt->mnt_mountpoint = dget(dentry);
|
||||
child_mnt->mnt_mountpoint = dget(mp->m_dentry);
|
||||
child_mnt->mnt_parent = mnt;
|
||||
spin_lock(&dentry->d_lock);
|
||||
dentry->d_flags |= DCACHE_MOUNTED;
|
||||
spin_unlock(&dentry->d_lock);
|
||||
child_mnt->mnt_mp = mp;
|
||||
}
|
||||
|
||||
/*
|
||||
* vfsmount lock must be held for write
|
||||
*/
|
||||
static void attach_mnt(struct mount *mnt, struct path *path)
|
||||
static void attach_mnt(struct mount *mnt,
|
||||
struct mount *parent,
|
||||
struct mountpoint *mp)
|
||||
{
|
||||
mnt_set_mountpoint(real_mount(path->mnt), path->dentry, mnt);
|
||||
mnt_set_mountpoint(parent, mp, mnt);
|
||||
list_add_tail(&mnt->mnt_hash, mount_hashtable +
|
||||
hash(path->mnt, path->dentry));
|
||||
list_add_tail(&mnt->mnt_child, &real_mount(path->mnt)->mnt_mounts);
|
||||
hash(&parent->mnt, mp->m_dentry));
|
||||
list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1138,7 +1166,8 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
|
||||
list_del_init(&p->mnt_child);
|
||||
if (mnt_has_parent(p)) {
|
||||
p->mnt_parent->mnt_ghosts++;
|
||||
dentry_reset_mounted(p->mnt_mountpoint);
|
||||
put_mountpoint(p->mnt_mp);
|
||||
p->mnt_mp = NULL;
|
||||
}
|
||||
change_mnt_propagation(p, MS_PRIVATE);
|
||||
}
|
||||
@ -1323,8 +1352,7 @@ static bool mnt_ns_loop(struct path *path)
|
||||
struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
|
||||
int flag)
|
||||
{
|
||||
struct mount *res, *p, *q, *r;
|
||||
struct path path;
|
||||
struct mount *res, *p, *q, *r, *parent;
|
||||
|
||||
if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(mnt))
|
||||
return ERR_PTR(-EINVAL);
|
||||
@ -1351,14 +1379,13 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
|
||||
q = q->mnt_parent;
|
||||
}
|
||||
p = s;
|
||||
path.mnt = &q->mnt;
|
||||
path.dentry = p->mnt_mountpoint;
|
||||
parent = q;
|
||||
q = clone_mnt(p, p->mnt.mnt_root, flag);
|
||||
if (IS_ERR(q))
|
||||
goto out;
|
||||
br_write_lock(&vfsmount_lock);
|
||||
list_add_tail(&q->mnt_list, &res->mnt_list);
|
||||
attach_mnt(q, &path);
|
||||
attach_mnt(q, parent, p->mnt_mp);
|
||||
br_write_unlock(&vfsmount_lock);
|
||||
}
|
||||
}
|
||||
@ -1505,11 +1532,11 @@ static int invent_group_ids(struct mount *mnt, bool recurse)
|
||||
* in allocations.
|
||||
*/
|
||||
static int attach_recursive_mnt(struct mount *source_mnt,
|
||||
struct path *path, struct path *parent_path)
|
||||
struct mount *dest_mnt,
|
||||
struct mountpoint *dest_mp,
|
||||
struct path *parent_path)
|
||||
{
|
||||
LIST_HEAD(tree_list);
|
||||
struct mount *dest_mnt = real_mount(path->mnt);
|
||||
struct dentry *dest_dentry = path->dentry;
|
||||
struct mount *child, *p;
|
||||
int err;
|
||||
|
||||
@ -1518,7 +1545,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
|
||||
if (err)
|
||||
goto out;
|
||||
}
|
||||
err = propagate_mnt(dest_mnt, dest_dentry, source_mnt, &tree_list);
|
||||
err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
|
||||
if (err)
|
||||
goto out_cleanup_ids;
|
||||
|
||||
@ -1530,10 +1557,10 @@ static int attach_recursive_mnt(struct mount *source_mnt,
|
||||
}
|
||||
if (parent_path) {
|
||||
detach_mnt(source_mnt, parent_path);
|
||||
attach_mnt(source_mnt, path);
|
||||
attach_mnt(source_mnt, dest_mnt, dest_mp);
|
||||
touch_mnt_namespace(source_mnt->mnt_ns);
|
||||
} else {
|
||||
mnt_set_mountpoint(dest_mnt, dest_dentry, source_mnt);
|
||||
mnt_set_mountpoint(dest_mnt, dest_mp, source_mnt);
|
||||
commit_tree(source_mnt);
|
||||
}
|
||||
|
||||
@ -1552,46 +1579,53 @@ static int attach_recursive_mnt(struct mount *source_mnt,
|
||||
return err;
|
||||
}
|
||||
|
||||
static int lock_mount(struct path *path)
|
||||
static struct mountpoint *lock_mount(struct path *path)
|
||||
{
|
||||
struct vfsmount *mnt;
|
||||
struct dentry *dentry = path->dentry;
|
||||
retry:
|
||||
mutex_lock(&path->dentry->d_inode->i_mutex);
|
||||
if (unlikely(cant_mount(path->dentry))) {
|
||||
mutex_unlock(&path->dentry->d_inode->i_mutex);
|
||||
return -ENOENT;
|
||||
mutex_lock(&dentry->d_inode->i_mutex);
|
||||
if (unlikely(cant_mount(dentry))) {
|
||||
mutex_unlock(&dentry->d_inode->i_mutex);
|
||||
return ERR_PTR(-ENOENT);
|
||||
}
|
||||
down_write(&namespace_sem);
|
||||
mnt = lookup_mnt(path);
|
||||
if (likely(!mnt))
|
||||
return 0;
|
||||
if (likely(!mnt)) {
|
||||
struct mountpoint *mp = new_mountpoint(dentry);
|
||||
if (IS_ERR(mp)) {
|
||||
up_write(&namespace_sem);
|
||||
mutex_unlock(&dentry->d_inode->i_mutex);
|
||||
return mp;
|
||||
}
|
||||
return mp;
|
||||
}
|
||||
up_write(&namespace_sem);
|
||||
mutex_unlock(&path->dentry->d_inode->i_mutex);
|
||||
path_put(path);
|
||||
path->mnt = mnt;
|
||||
path->dentry = dget(mnt->mnt_root);
|
||||
dentry = path->dentry = dget(mnt->mnt_root);
|
||||
goto retry;
|
||||
}
|
||||
|
||||
static void unlock_mount(struct path *path)
|
||||
static void unlock_mount(struct mountpoint *where)
|
||||
{
|
||||
struct dentry *dentry = where->m_dentry;
|
||||
put_mountpoint(where);
|
||||
up_write(&namespace_sem);
|
||||
mutex_unlock(&path->dentry->d_inode->i_mutex);
|
||||
mutex_unlock(&dentry->d_inode->i_mutex);
|
||||
}
|
||||
|
||||
static int graft_tree(struct mount *mnt, struct path *path)
|
||||
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(path->dentry->d_inode->i_mode) !=
|
||||
if (S_ISDIR(mp->m_dentry->d_inode->i_mode) !=
|
||||
S_ISDIR(mnt->mnt.mnt_root->d_inode->i_mode))
|
||||
return -ENOTDIR;
|
||||
|
||||
if (d_unlinked(path->dentry))
|
||||
return -ENOENT;
|
||||
|
||||
return attach_recursive_mnt(mnt, path, NULL);
|
||||
return attach_recursive_mnt(mnt, p, mp, NULL);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1654,7 +1688,8 @@ static int do_loopback(struct path *path, const char *old_name,
|
||||
{
|
||||
LIST_HEAD(umount_list);
|
||||
struct path old_path;
|
||||
struct mount *mnt = NULL, *old;
|
||||
struct mount *mnt = NULL, *old, *parent;
|
||||
struct mountpoint *mp;
|
||||
int err;
|
||||
if (!old_name || !*old_name)
|
||||
return -EINVAL;
|
||||
@ -1666,17 +1701,19 @@ static int do_loopback(struct path *path, const char *old_name,
|
||||
if (mnt_ns_loop(&old_path))
|
||||
goto out;
|
||||
|
||||
err = lock_mount(path);
|
||||
if (err)
|
||||
mp = lock_mount(path);
|
||||
err = PTR_ERR(mp);
|
||||
if (IS_ERR(mp))
|
||||
goto out;
|
||||
|
||||
old = real_mount(old_path.mnt);
|
||||
parent = real_mount(path->mnt);
|
||||
|
||||
err = -EINVAL;
|
||||
if (IS_MNT_UNBINDABLE(old))
|
||||
goto out2;
|
||||
|
||||
if (!check_mnt(real_mount(path->mnt)) || !check_mnt(old))
|
||||
if (!check_mnt(parent) || !check_mnt(old))
|
||||
goto out2;
|
||||
|
||||
if (recurse)
|
||||
@ -1689,14 +1726,14 @@ static int do_loopback(struct path *path, const char *old_name,
|
||||
goto out2;
|
||||
}
|
||||
|
||||
err = graft_tree(mnt, path);
|
||||
err = graft_tree(mnt, parent, mp);
|
||||
if (err) {
|
||||
br_write_lock(&vfsmount_lock);
|
||||
umount_tree(mnt, 0, &umount_list);
|
||||
br_write_unlock(&vfsmount_lock);
|
||||
}
|
||||
out2:
|
||||
unlock_mount(path);
|
||||
unlock_mount(mp);
|
||||
release_mounts(&umount_list);
|
||||
out:
|
||||
path_put(&old_path);
|
||||
@ -1779,6 +1816,7 @@ static int do_move_mount(struct path *path, const char *old_name)
|
||||
struct path old_path, parent_path;
|
||||
struct mount *p;
|
||||
struct mount *old;
|
||||
struct mountpoint *mp;
|
||||
int err;
|
||||
if (!old_name || !*old_name)
|
||||
return -EINVAL;
|
||||
@ -1786,8 +1824,9 @@ static int do_move_mount(struct path *path, const char *old_name)
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = lock_mount(path);
|
||||
if (err < 0)
|
||||
mp = lock_mount(path);
|
||||
err = PTR_ERR(mp);
|
||||
if (IS_ERR(mp))
|
||||
goto out;
|
||||
|
||||
old = real_mount(old_path.mnt);
|
||||
@ -1797,9 +1836,6 @@ static int do_move_mount(struct path *path, const char *old_name)
|
||||
if (!check_mnt(p) || !check_mnt(old))
|
||||
goto out1;
|
||||
|
||||
if (d_unlinked(path->dentry))
|
||||
goto out1;
|
||||
|
||||
err = -EINVAL;
|
||||
if (old_path.dentry != old_path.mnt->mnt_root)
|
||||
goto out1;
|
||||
@ -1826,7 +1862,7 @@ static int do_move_mount(struct path *path, const char *old_name)
|
||||
if (p == old)
|
||||
goto out1;
|
||||
|
||||
err = attach_recursive_mnt(old, path, &parent_path);
|
||||
err = attach_recursive_mnt(old, real_mount(path->mnt), mp, &parent_path);
|
||||
if (err)
|
||||
goto out1;
|
||||
|
||||
@ -1834,7 +1870,7 @@ static int do_move_mount(struct path *path, const char *old_name)
|
||||
* automatically */
|
||||
list_del_init(&old->mnt_expire);
|
||||
out1:
|
||||
unlock_mount(path);
|
||||
unlock_mount(mp);
|
||||
out:
|
||||
if (!err)
|
||||
path_put(&parent_path);
|
||||
@ -1870,21 +1906,24 @@ static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype)
|
||||
*/
|
||||
static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
|
||||
{
|
||||
struct mountpoint *mp;
|
||||
struct mount *parent;
|
||||
int err;
|
||||
|
||||
mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL);
|
||||
|
||||
err = lock_mount(path);
|
||||
if (err)
|
||||
return err;
|
||||
mp = lock_mount(path);
|
||||
if (IS_ERR(mp))
|
||||
return PTR_ERR(mp);
|
||||
|
||||
parent = real_mount(path->mnt);
|
||||
err = -EINVAL;
|
||||
if (unlikely(!check_mnt(real_mount(path->mnt)))) {
|
||||
if (unlikely(!check_mnt(parent))) {
|
||||
/* that's acceptable only for automounts done in private ns */
|
||||
if (!(mnt_flags & MNT_SHRINKABLE))
|
||||
goto unlock;
|
||||
/* ... and for those we'd better have mountpoint still alive */
|
||||
if (!real_mount(path->mnt)->mnt_ns)
|
||||
if (!parent->mnt_ns)
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
@ -1899,10 +1938,10 @@ static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
|
||||
goto unlock;
|
||||
|
||||
newmnt->mnt.mnt_flags = mnt_flags;
|
||||
err = graft_tree(newmnt, path);
|
||||
err = graft_tree(newmnt, parent, mp);
|
||||
|
||||
unlock:
|
||||
unlock_mount(path);
|
||||
unlock_mount(mp);
|
||||
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 *);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user