Commit fedc1ed0 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs fixes from Al Viro:
 "Switch mnt_hash to hlist, turning the races between __lookup_mnt() and
  hash modifications into false negatives from __lookup_mnt() (instead
  of hangs)"

On the false negatives from __lookup_mnt():
 "The *only* thing we care about is not getting stuck in __lookup_mnt().
  If it misses an entry because something in front of it just got moved
  around, etc, we are fine.  We'll notice that mount_lock mismatch and
  that'll be it"

* 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  switch mnt_hash to hlist
  don't bother with propagate_mnt() unless the target is shared
  keep shadowed vfsmounts together
  resizable namespace.c hashes
parents 01358e56 38129a13
...@@ -19,13 +19,13 @@ struct mnt_pcp { ...@@ -19,13 +19,13 @@ struct mnt_pcp {
}; };
struct mountpoint { struct mountpoint {
struct list_head m_hash; struct hlist_node m_hash;
struct dentry *m_dentry; struct dentry *m_dentry;
int m_count; int m_count;
}; };
struct mount { struct mount {
struct list_head mnt_hash; struct hlist_node mnt_hash;
struct mount *mnt_parent; struct mount *mnt_parent;
struct dentry *mnt_mountpoint; struct dentry *mnt_mountpoint;
struct vfsmount mnt; struct vfsmount mnt;
......
...@@ -23,11 +23,34 @@ ...@@ -23,11 +23,34 @@
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/proc_ns.h> #include <linux/proc_ns.h>
#include <linux/magic.h> #include <linux/magic.h>
#include <linux/bootmem.h>
#include "pnode.h" #include "pnode.h"
#include "internal.h" #include "internal.h"
#define HASH_SHIFT ilog2(PAGE_SIZE / sizeof(struct list_head)) static unsigned int m_hash_mask __read_mostly;
#define HASH_SIZE (1UL << HASH_SHIFT) static unsigned int m_hash_shift __read_mostly;
static unsigned int mp_hash_mask __read_mostly;
static unsigned int mp_hash_shift __read_mostly;
static __initdata unsigned long mhash_entries;
static int __init set_mhash_entries(char *str)
{
if (!str)
return 0;
mhash_entries = simple_strtoul(str, &str, 0);
return 1;
}
__setup("mhash_entries=", set_mhash_entries);
static __initdata unsigned long mphash_entries;
static int __init set_mphash_entries(char *str)
{
if (!str)
return 0;
mphash_entries = simple_strtoul(str, &str, 0);
return 1;
}
__setup("mphash_entries=", set_mphash_entries);
static int event; static int event;
static DEFINE_IDA(mnt_id_ida); static DEFINE_IDA(mnt_id_ida);
...@@ -36,8 +59,8 @@ static DEFINE_SPINLOCK(mnt_id_lock); ...@@ -36,8 +59,8 @@ static DEFINE_SPINLOCK(mnt_id_lock);
static int mnt_id_start = 0; static int mnt_id_start = 0;
static int mnt_group_start = 1; static int mnt_group_start = 1;
static struct list_head *mount_hashtable __read_mostly; static struct hlist_head *mount_hashtable __read_mostly;
static struct list_head *mountpoint_hashtable __read_mostly; static struct hlist_head *mountpoint_hashtable __read_mostly;
static struct kmem_cache *mnt_cache __read_mostly; static struct kmem_cache *mnt_cache __read_mostly;
static DECLARE_RWSEM(namespace_sem); static DECLARE_RWSEM(namespace_sem);
...@@ -55,12 +78,19 @@ EXPORT_SYMBOL_GPL(fs_kobj); ...@@ -55,12 +78,19 @@ EXPORT_SYMBOL_GPL(fs_kobj);
*/ */
__cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock); __cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock);
static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry) static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct dentry *dentry)
{ {
unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES); unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
tmp += ((unsigned long)dentry / L1_CACHE_BYTES); tmp += ((unsigned long)dentry / L1_CACHE_BYTES);
tmp = tmp + (tmp >> HASH_SHIFT); tmp = tmp + (tmp >> m_hash_shift);
return tmp & (HASH_SIZE - 1); return &mount_hashtable[tmp & m_hash_mask];
}
static inline struct hlist_head *mp_hash(struct dentry *dentry)
{
unsigned long tmp = ((unsigned long)dentry / L1_CACHE_BYTES);
tmp = tmp + (tmp >> mp_hash_shift);
return &mountpoint_hashtable[tmp & mp_hash_mask];
} }
/* /*
...@@ -187,7 +217,7 @@ static struct mount *alloc_vfsmnt(const char *name) ...@@ -187,7 +217,7 @@ static struct mount *alloc_vfsmnt(const char *name)
mnt->mnt_writers = 0; mnt->mnt_writers = 0;
#endif #endif
INIT_LIST_HEAD(&mnt->mnt_hash); INIT_HLIST_NODE(&mnt->mnt_hash);
INIT_LIST_HEAD(&mnt->mnt_child); INIT_LIST_HEAD(&mnt->mnt_child);
INIT_LIST_HEAD(&mnt->mnt_mounts); INIT_LIST_HEAD(&mnt->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list); INIT_LIST_HEAD(&mnt->mnt_list);
...@@ -575,10 +605,10 @@ bool legitimize_mnt(struct vfsmount *bastard, unsigned seq) ...@@ -575,10 +605,10 @@ bool legitimize_mnt(struct vfsmount *bastard, unsigned seq)
*/ */
struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry) struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)
{ {
struct list_head *head = mount_hashtable + hash(mnt, dentry); struct hlist_head *head = m_hash(mnt, dentry);
struct mount *p; struct mount *p;
list_for_each_entry_rcu(p, head, mnt_hash) hlist_for_each_entry_rcu(p, head, mnt_hash)
if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry) if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry)
return p; return p;
return NULL; return NULL;
...@@ -590,13 +620,17 @@ struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry) ...@@ -590,13 +620,17 @@ struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry)
*/ */
struct mount *__lookup_mnt_last(struct vfsmount *mnt, struct dentry *dentry) struct mount *__lookup_mnt_last(struct vfsmount *mnt, struct dentry *dentry)
{ {
struct list_head *head = mount_hashtable + hash(mnt, dentry); struct mount *p, *res;
struct mount *p; res = p = __lookup_mnt(mnt, dentry);
if (!p)
list_for_each_entry_reverse(p, head, mnt_hash) goto out;
if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry) hlist_for_each_entry_continue(p, mnt_hash) {
return p; if (&p->mnt_parent->mnt != mnt || p->mnt_mountpoint != dentry)
return NULL; break;
res = p;
}
out:
return res;
} }
/* /*
...@@ -633,11 +667,11 @@ struct vfsmount *lookup_mnt(struct path *path) ...@@ -633,11 +667,11 @@ struct vfsmount *lookup_mnt(struct path *path)
static struct mountpoint *new_mountpoint(struct dentry *dentry) static struct mountpoint *new_mountpoint(struct dentry *dentry)
{ {
struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry); struct hlist_head *chain = mp_hash(dentry);
struct mountpoint *mp; struct mountpoint *mp;
int ret; int ret;
list_for_each_entry(mp, chain, m_hash) { hlist_for_each_entry(mp, chain, m_hash) {
if (mp->m_dentry == dentry) { if (mp->m_dentry == dentry) {
/* might be worth a WARN_ON() */ /* might be worth a WARN_ON() */
if (d_unlinked(dentry)) if (d_unlinked(dentry))
...@@ -659,7 +693,7 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry) ...@@ -659,7 +693,7 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
mp->m_dentry = dentry; mp->m_dentry = dentry;
mp->m_count = 1; mp->m_count = 1;
list_add(&mp->m_hash, chain); hlist_add_head(&mp->m_hash, chain);
return mp; return mp;
} }
...@@ -670,7 +704,7 @@ static void put_mountpoint(struct mountpoint *mp) ...@@ -670,7 +704,7 @@ static void put_mountpoint(struct mountpoint *mp)
spin_lock(&dentry->d_lock); spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_MOUNTED; dentry->d_flags &= ~DCACHE_MOUNTED;
spin_unlock(&dentry->d_lock); spin_unlock(&dentry->d_lock);
list_del(&mp->m_hash); hlist_del(&mp->m_hash);
kfree(mp); kfree(mp);
} }
} }
...@@ -712,7 +746,7 @@ static void detach_mnt(struct mount *mnt, struct path *old_path) ...@@ -712,7 +746,7 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
mnt->mnt_parent = mnt; mnt->mnt_parent = mnt;
mnt->mnt_mountpoint = mnt->mnt.mnt_root; mnt->mnt_mountpoint = mnt->mnt.mnt_root;
list_del_init(&mnt->mnt_child); list_del_init(&mnt->mnt_child);
list_del_init(&mnt->mnt_hash); hlist_del_init_rcu(&mnt->mnt_hash);
put_mountpoint(mnt->mnt_mp); put_mountpoint(mnt->mnt_mp);
mnt->mnt_mp = NULL; mnt->mnt_mp = NULL;
} }
...@@ -739,15 +773,14 @@ static void attach_mnt(struct mount *mnt, ...@@ -739,15 +773,14 @@ static void attach_mnt(struct mount *mnt,
struct mountpoint *mp) struct mountpoint *mp)
{ {
mnt_set_mountpoint(parent, mp, mnt); mnt_set_mountpoint(parent, mp, mnt);
list_add_tail(&mnt->mnt_hash, mount_hashtable + hlist_add_head_rcu(&mnt->mnt_hash, m_hash(&parent->mnt, mp->m_dentry));
hash(&parent->mnt, mp->m_dentry));
list_add_tail(&mnt->mnt_child, &parent->mnt_mounts); list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
} }
/* /*
* vfsmount lock must be held for write * vfsmount lock must be held for write
*/ */
static void commit_tree(struct mount *mnt) static void commit_tree(struct mount *mnt, struct mount *shadows)
{ {
struct mount *parent = mnt->mnt_parent; struct mount *parent = mnt->mnt_parent;
struct mount *m; struct mount *m;
...@@ -762,8 +795,11 @@ static void commit_tree(struct mount *mnt) ...@@ -762,8 +795,11 @@ static void commit_tree(struct mount *mnt)
list_splice(&head, n->list.prev); list_splice(&head, n->list.prev);
list_add_tail(&mnt->mnt_hash, mount_hashtable + if (shadows)
hash(&parent->mnt, mnt->mnt_mountpoint)); hlist_add_after_rcu(&shadows->mnt_hash, &mnt->mnt_hash);
else
hlist_add_head_rcu(&mnt->mnt_hash,
m_hash(&parent->mnt, mnt->mnt_mountpoint));
list_add_tail(&mnt->mnt_child, &parent->mnt_mounts); list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
touch_mnt_namespace(n); touch_mnt_namespace(n);
} }
...@@ -1153,26 +1189,28 @@ int may_umount(struct vfsmount *mnt) ...@@ -1153,26 +1189,28 @@ int may_umount(struct vfsmount *mnt)
EXPORT_SYMBOL(may_umount); EXPORT_SYMBOL(may_umount);
static LIST_HEAD(unmounted); /* protected by namespace_sem */ static HLIST_HEAD(unmounted); /* protected by namespace_sem */
static void namespace_unlock(void) static void namespace_unlock(void)
{ {
struct mount *mnt; struct mount *mnt;
LIST_HEAD(head); struct hlist_head head = unmounted;
if (likely(list_empty(&unmounted))) { if (likely(hlist_empty(&head))) {
up_write(&namespace_sem); up_write(&namespace_sem);
return; return;
} }
list_splice_init(&unmounted, &head); head.first->pprev = &head.first;
INIT_HLIST_HEAD(&unmounted);
up_write(&namespace_sem); up_write(&namespace_sem);
synchronize_rcu(); synchronize_rcu();
while (!list_empty(&head)) { while (!hlist_empty(&head)) {
mnt = list_first_entry(&head, struct mount, mnt_hash); mnt = hlist_entry(head.first, struct mount, mnt_hash);
list_del_init(&mnt->mnt_hash); hlist_del_init(&mnt->mnt_hash);
if (mnt->mnt_ex_mountpoint.mnt) if (mnt->mnt_ex_mountpoint.mnt)
path_put(&mnt->mnt_ex_mountpoint); path_put(&mnt->mnt_ex_mountpoint);
mntput(&mnt->mnt); mntput(&mnt->mnt);
...@@ -1193,16 +1231,19 @@ static inline void namespace_lock(void) ...@@ -1193,16 +1231,19 @@ static inline void namespace_lock(void)
*/ */
void umount_tree(struct mount *mnt, int how) void umount_tree(struct mount *mnt, int how)
{ {
LIST_HEAD(tmp_list); HLIST_HEAD(tmp_list);
struct mount *p; struct mount *p;
struct mount *last = NULL;
for (p = mnt; p; p = next_mnt(p, mnt)) for (p = mnt; p; p = next_mnt(p, mnt)) {
list_move(&p->mnt_hash, &tmp_list); hlist_del_init_rcu(&p->mnt_hash);
hlist_add_head(&p->mnt_hash, &tmp_list);
}
if (how) if (how)
propagate_umount(&tmp_list); propagate_umount(&tmp_list);
list_for_each_entry(p, &tmp_list, mnt_hash) { hlist_for_each_entry(p, &tmp_list, mnt_hash) {
list_del_init(&p->mnt_expire); list_del_init(&p->mnt_expire);
list_del_init(&p->mnt_list); list_del_init(&p->mnt_list);
__touch_mnt_namespace(p->mnt_ns); __touch_mnt_namespace(p->mnt_ns);
...@@ -1220,8 +1261,13 @@ void umount_tree(struct mount *mnt, int how) ...@@ -1220,8 +1261,13 @@ void umount_tree(struct mount *mnt, int how)
p->mnt_mp = NULL; p->mnt_mp = NULL;
} }
change_mnt_propagation(p, MS_PRIVATE); change_mnt_propagation(p, MS_PRIVATE);
last = p;
}
if (last) {
last->mnt_hash.next = unmounted.first;
unmounted.first = tmp_list.first;
unmounted.first->pprev = &unmounted.first;
} }
list_splice(&tmp_list, &unmounted);
} }
static void shrink_submounts(struct mount *mnt); static void shrink_submounts(struct mount *mnt);
...@@ -1605,24 +1651,23 @@ static int attach_recursive_mnt(struct mount *source_mnt, ...@@ -1605,24 +1651,23 @@ static int attach_recursive_mnt(struct mount *source_mnt,
struct mountpoint *dest_mp, struct mountpoint *dest_mp,
struct path *parent_path) struct path *parent_path)
{ {
LIST_HEAD(tree_list); HLIST_HEAD(tree_list);
struct mount *child, *p; struct mount *child, *p;
struct hlist_node *n;
int err; int err;
if (IS_MNT_SHARED(dest_mnt)) { if (IS_MNT_SHARED(dest_mnt)) {
err = invent_group_ids(source_mnt, true); err = invent_group_ids(source_mnt, true);
if (err) if (err)
goto out; goto out;
}
err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list); err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
if (err) if (err)
goto out_cleanup_ids; goto out_cleanup_ids;
lock_mount_hash(); lock_mount_hash();
if (IS_MNT_SHARED(dest_mnt)) {
for (p = source_mnt; p; p = next_mnt(p, source_mnt)) for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p); set_mnt_shared(p);
} else {
lock_mount_hash();
} }
if (parent_path) { if (parent_path) {
detach_mnt(source_mnt, parent_path); detach_mnt(source_mnt, parent_path);
...@@ -1630,19 +1675,21 @@ static int attach_recursive_mnt(struct mount *source_mnt, ...@@ -1630,19 +1675,21 @@ static int attach_recursive_mnt(struct mount *source_mnt,
touch_mnt_namespace(source_mnt->mnt_ns); touch_mnt_namespace(source_mnt->mnt_ns);
} else { } else {
mnt_set_mountpoint(dest_mnt, dest_mp, source_mnt); mnt_set_mountpoint(dest_mnt, dest_mp, source_mnt);
commit_tree(source_mnt); commit_tree(source_mnt, NULL);
} }
list_for_each_entry_safe(child, p, &tree_list, mnt_hash) { hlist_for_each_entry_safe(child, n, &tree_list, mnt_hash) {
list_del_init(&child->mnt_hash); struct mount *q;
commit_tree(child); hlist_del_init(&child->mnt_hash);
q = __lookup_mnt_last(&child->mnt_parent->mnt,
child->mnt_mountpoint);
commit_tree(child, q);
} }
unlock_mount_hash(); unlock_mount_hash();
return 0; return 0;
out_cleanup_ids: out_cleanup_ids:
if (IS_MNT_SHARED(dest_mnt))
cleanup_group_ids(source_mnt, NULL); cleanup_group_ids(source_mnt, NULL);
out: out:
return err; return err;
...@@ -2777,18 +2824,24 @@ void __init mnt_init(void) ...@@ -2777,18 +2824,24 @@ void __init mnt_init(void)
mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount), mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount),
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
mount_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC); mount_hashtable = alloc_large_system_hash("Mount-cache",
mountpoint_hashtable = (struct list_head *)__get_free_page(GFP_ATOMIC); sizeof(struct hlist_head),
mhash_entries, 19,
0,
&m_hash_shift, &m_hash_mask, 0, 0);
mountpoint_hashtable = alloc_large_system_hash("Mountpoint-cache",
sizeof(struct hlist_head),
mphash_entries, 19,
0,
&mp_hash_shift, &mp_hash_mask, 0, 0);
if (!mount_hashtable || !mountpoint_hashtable) if (!mount_hashtable || !mountpoint_hashtable)
panic("Failed to allocate mount hash table\n"); panic("Failed to allocate mount hash table\n");
printk(KERN_INFO "Mount-cache hash table entries: %lu\n", HASH_SIZE); for (u = 0; u <= m_hash_mask; u++)
INIT_HLIST_HEAD(&mount_hashtable[u]);
for (u = 0; u < HASH_SIZE; u++) for (u = 0; u <= mp_hash_mask; u++)
INIT_LIST_HEAD(&mount_hashtable[u]); INIT_HLIST_HEAD(&mountpoint_hashtable[u]);
for (u = 0; u < HASH_SIZE; u++)
INIT_LIST_HEAD(&mountpoint_hashtable[u]);
kernfs_init(); kernfs_init();
......
...@@ -220,14 +220,14 @@ static struct mount *get_source(struct mount *dest, ...@@ -220,14 +220,14 @@ static struct mount *get_source(struct mount *dest,
* @tree_list : list of heads of trees to be attached. * @tree_list : list of heads of trees to be attached.
*/ */
int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp, int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
struct mount *source_mnt, struct list_head *tree_list) struct mount *source_mnt, struct hlist_head *tree_list)
{ {
struct user_namespace *user_ns = current->nsproxy->mnt_ns->user_ns; struct user_namespace *user_ns = current->nsproxy->mnt_ns->user_ns;
struct mount *m, *child; struct mount *m, *child;
int ret = 0; int ret = 0;
struct mount *prev_dest_mnt = dest_mnt; struct mount *prev_dest_mnt = dest_mnt;
struct mount *prev_src_mnt = source_mnt; struct mount *prev_src_mnt = source_mnt;
LIST_HEAD(tmp_list); HLIST_HEAD(tmp_list);
for (m = propagation_next(dest_mnt, dest_mnt); m; for (m = propagation_next(dest_mnt, dest_mnt); m;
m = propagation_next(m, dest_mnt)) { m = propagation_next(m, dest_mnt)) {
...@@ -246,27 +246,29 @@ int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp, ...@@ -246,27 +246,29 @@ int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
child = copy_tree(source, source->mnt.mnt_root, type); child = copy_tree(source, source->mnt.mnt_root, type);
if (IS_ERR(child)) { if (IS_ERR(child)) {
ret = PTR_ERR(child); ret = PTR_ERR(child);
list_splice(tree_list, tmp_list.prev); tmp_list = *tree_list;
tmp_list.first->pprev = &tmp_list.first;
INIT_HLIST_HEAD(tree_list);
goto out; goto out;
} }
if (is_subdir(dest_mp->m_dentry, m->mnt.mnt_root)) { if (is_subdir(dest_mp->m_dentry, m->mnt.mnt_root)) {
mnt_set_mountpoint(m, dest_mp, child); mnt_set_mountpoint(m, dest_mp, child);
list_add_tail(&child->mnt_hash, tree_list); hlist_add_head(&child->mnt_hash, tree_list);
} else { } else {
/* /*
* This can happen if the parent mount was bind mounted * This can happen if the parent mount was bind mounted
* on some subdirectory of a shared/slave mount. * on some subdirectory of a shared/slave mount.
*/ */
list_add_tail(&child->mnt_hash, &tmp_list); hlist_add_head(&child->mnt_hash, &tmp_list);
} }
prev_dest_mnt = m; prev_dest_mnt = m;
prev_src_mnt = child; prev_src_mnt = child;
} }
out: out:
lock_mount_hash(); lock_mount_hash();
while (!list_empty(&tmp_list)) { while (!hlist_empty(&tmp_list)) {
child = list_first_entry(&tmp_list, struct mount, mnt_hash); child = hlist_entry(tmp_list.first, struct mount, mnt_hash);
umount_tree(child, 0); umount_tree(child, 0);
} }
unlock_mount_hash(); unlock_mount_hash();
...@@ -338,8 +340,10 @@ static void __propagate_umount(struct mount *mnt) ...@@ -338,8 +340,10 @@ static void __propagate_umount(struct mount *mnt)
* umount the child only if the child has no * umount the child only if the child has no
* other children * other children
*/ */
if (child && list_empty(&child->mnt_mounts)) if (child && list_empty(&child->mnt_mounts)) {
list_move_tail(&child->mnt_hash, &mnt->mnt_hash); hlist_del_init_rcu(&child->mnt_hash);
hlist_add_before_rcu(&child->mnt_hash, &mnt->mnt_hash);
}
} }
} }
...@@ -350,11 +354,11 @@ static void __propagate_umount(struct mount *mnt) ...@@ -350,11 +354,11 @@ static void __propagate_umount(struct mount *mnt)
* *
* vfsmount lock must be held for write * vfsmount lock must be held for write
*/ */
int propagate_umount(struct list_head *list) int propagate_umount(struct hlist_head *list)
{ {
struct mount *mnt; struct mount *mnt;
list_for_each_entry(mnt, list, mnt_hash) hlist_for_each_entry(mnt, list, mnt_hash)
__propagate_umount(mnt); __propagate_umount(mnt);
return 0; return 0;
} }
...@@ -36,8 +36,8 @@ static inline void set_mnt_shared(struct mount *mnt) ...@@ -36,8 +36,8 @@ static inline void set_mnt_shared(struct mount *mnt)
void change_mnt_propagation(struct mount *, int); void change_mnt_propagation(struct mount *, int);
int propagate_mnt(struct mount *, struct mountpoint *, struct mount *, int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
struct list_head *); struct hlist_head *);
int propagate_umount(struct list_head *); int propagate_umount(struct hlist_head *);
int propagate_mount_busy(struct mount *, int); int propagate_mount_busy(struct mount *, int);
void mnt_release_group_id(struct mount *); void mnt_release_group_id(struct mount *);
int get_dominating_id(struct mount *mnt, const struct path *root); int get_dominating_id(struct mount *mnt, const struct path *root);
......
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