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Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c142
1 files changed, 72 insertions, 70 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index e6081996c9a2..1e4a5fe3d7b7 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -397,7 +397,7 @@ static int mnt_make_readonly(struct mount *mnt)
{
int ret = 0;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
/*
* After storing MNT_WRITE_HOLD, we'll read the counters. This store
@@ -431,15 +431,15 @@ static int mnt_make_readonly(struct mount *mnt)
*/
smp_wmb();
mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
return ret;
}
static void __mnt_unmake_readonly(struct mount *mnt)
{
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
mnt->mnt.mnt_flags &= ~MNT_READONLY;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
int sb_prepare_remount_readonly(struct super_block *sb)
@@ -451,7 +451,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
if (atomic_long_read(&sb->s_remove_count))
return -EBUSY;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) {
if (!(mnt->mnt.mnt_flags & MNT_READONLY)) {
mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
@@ -473,7 +473,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
if (mnt->mnt.mnt_flags & MNT_WRITE_HOLD)
mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
return err;
}
@@ -522,14 +522,14 @@ struct vfsmount *lookup_mnt(struct path *path)
{
struct mount *child_mnt;
- br_read_lock(vfsmount_lock);
+ br_read_lock(&vfsmount_lock);
child_mnt = __lookup_mnt(path->mnt, path->dentry, 1);
if (child_mnt) {
mnt_add_count(child_mnt, 1);
- br_read_unlock(vfsmount_lock);
+ br_read_unlock(&vfsmount_lock);
return &child_mnt->mnt;
} else {
- br_read_unlock(vfsmount_lock);
+ br_read_unlock(&vfsmount_lock);
return NULL;
}
}
@@ -714,9 +714,9 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
mnt->mnt.mnt_sb = root->d_sb;
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_add_tail(&mnt->mnt_instance, &root->d_sb->s_mounts);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
return &mnt->mnt;
}
EXPORT_SYMBOL_GPL(vfs_kern_mount);
@@ -745,9 +745,9 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
mnt->mnt.mnt_root = dget(root);
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_add_tail(&mnt->mnt_instance, &sb->s_mounts);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
if (flag & CL_SLAVE) {
list_add(&mnt->mnt_slave, &old->mnt_slave_list);
@@ -803,35 +803,36 @@ static void mntput_no_expire(struct mount *mnt)
{
put_again:
#ifdef CONFIG_SMP
- br_read_lock(vfsmount_lock);
+ br_read_lock(&vfsmount_lock);
if (likely(atomic_read(&mnt->mnt_longterm))) {
mnt_add_count(mnt, -1);
- br_read_unlock(vfsmount_lock);
+ br_read_unlock(&vfsmount_lock);
return;
}
- br_read_unlock(vfsmount_lock);
+ br_read_unlock(&vfsmount_lock);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
mnt_add_count(mnt, -1);
if (mnt_get_count(mnt)) {
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
return;
}
#else
mnt_add_count(mnt, -1);
if (likely(mnt_get_count(mnt)))
return;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
#endif
if (unlikely(mnt->mnt_pinned)) {
mnt_add_count(mnt, mnt->mnt_pinned + 1);
mnt->mnt_pinned = 0;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
acct_auto_close_mnt(&mnt->mnt);
goto put_again;
}
+
list_del(&mnt->mnt_instance);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
mntfree(mnt);
}
@@ -857,21 +858,21 @@ EXPORT_SYMBOL(mntget);
void mnt_pin(struct vfsmount *mnt)
{
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
real_mount(mnt)->mnt_pinned++;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
EXPORT_SYMBOL(mnt_pin);
void mnt_unpin(struct vfsmount *m)
{
struct mount *mnt = real_mount(m);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
if (mnt->mnt_pinned) {
mnt_add_count(mnt, 1);
mnt->mnt_pinned--;
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
EXPORT_SYMBOL(mnt_unpin);
@@ -988,12 +989,12 @@ int may_umount_tree(struct vfsmount *m)
BUG_ON(!m);
/* write lock needed for mnt_get_count */
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
for (p = mnt; p; p = next_mnt(p, mnt)) {
actual_refs += mnt_get_count(p);
minimum_refs += 2;
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
if (actual_refs > minimum_refs)
return 0;
@@ -1020,10 +1021,10 @@ int may_umount(struct vfsmount *mnt)
{
int ret = 1;
down_read(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
if (propagate_mount_busy(real_mount(mnt), 2))
ret = 0;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_read(&namespace_sem);
return ret;
}
@@ -1040,13 +1041,13 @@ void release_mounts(struct list_head *head)
struct dentry *dentry;
struct mount *m;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
dentry = mnt->mnt_mountpoint;
m = mnt->mnt_parent;
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
m->mnt_ghosts--;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
dput(dentry);
mntput(&m->mnt);
}
@@ -1073,8 +1074,9 @@ void umount_tree(struct mount *mnt, int propagate, struct list_head *kill)
list_del_init(&p->mnt_expire);
list_del_init(&p->mnt_list);
__touch_mnt_namespace(p->mnt_ns);
+ if (p->mnt_ns)
+ __mnt_make_shortterm(p);
p->mnt_ns = NULL;
- __mnt_make_shortterm(p);
list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
p->mnt_parent->mnt_ghosts++;
@@ -1112,12 +1114,12 @@ static int do_umount(struct mount *mnt, int flags)
* probably don't strictly need the lock here if we examined
* all race cases, but it's a slowpath.
*/
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
if (mnt_get_count(mnt) != 2) {
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
return -EBUSY;
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
if (!xchg(&mnt->mnt_expiry_mark, 1))
return -EAGAIN;
@@ -1159,7 +1161,7 @@ static int do_umount(struct mount *mnt, int flags)
}
down_write(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
event++;
if (!(flags & MNT_DETACH))
@@ -1171,7 +1173,7 @@ static int do_umount(struct mount *mnt, int flags)
umount_tree(mnt, 1, &umount_list);
retval = 0;
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
return retval;
@@ -1286,19 +1288,19 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
q = clone_mnt(p, p->mnt.mnt_root, flag);
if (!q)
goto Enomem;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_add_tail(&q->mnt_list, &res->mnt_list);
attach_mnt(q, &path);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
}
return res;
Enomem:
if (res) {
LIST_HEAD(umount_list);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
umount_tree(res, 0, &umount_list);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
release_mounts(&umount_list);
}
return NULL;
@@ -1318,9 +1320,9 @@ void drop_collected_mounts(struct vfsmount *mnt)
{
LIST_HEAD(umount_list);
down_write(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
umount_tree(real_mount(mnt), 0, &umount_list);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
}
@@ -1448,7 +1450,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
if (err)
goto out_cleanup_ids;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
if (IS_MNT_SHARED(dest_mnt)) {
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
@@ -1467,7 +1469,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
list_del_init(&child->mnt_hash);
commit_tree(child);
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
return 0;
@@ -1565,10 +1567,10 @@ static int do_change_type(struct path *path, int flag)
goto out_unlock;
}
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL))
change_mnt_propagation(m, type);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
out_unlock:
up_write(&namespace_sem);
@@ -1617,9 +1619,9 @@ static int do_loopback(struct path *path, char *old_name,
err = graft_tree(mnt, path);
if (err) {
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
umount_tree(mnt, 0, &umount_list);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
out2:
unlock_mount(path);
@@ -1677,16 +1679,16 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
else
err = do_remount_sb(sb, flags, data, 0);
if (!err) {
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
mnt_flags |= mnt->mnt.mnt_flags & MNT_PROPAGATION_MASK;
mnt->mnt.mnt_flags = mnt_flags;
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
up_write(&sb->s_umount);
if (!err) {
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
touch_mnt_namespace(mnt->mnt_ns);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
}
return err;
}
@@ -1893,9 +1895,9 @@ fail:
/* remove m from any expiration list it may be on */
if (!list_empty(&mnt->mnt_expire)) {
down_write(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_del_init(&mnt->mnt_expire);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
}
mntput(m);
@@ -1911,11 +1913,11 @@ fail:
void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list)
{
down_write(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
}
EXPORT_SYMBOL(mnt_set_expiry);
@@ -1935,7 +1937,7 @@ void mark_mounts_for_expiry(struct list_head *mounts)
return;
down_write(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
/* extract from the expiration list every vfsmount that matches the
* following criteria:
@@ -1954,7 +1956,7 @@ void mark_mounts_for_expiry(struct list_head *mounts)
touch_mnt_namespace(mnt->mnt_ns);
umount_tree(mnt, 1, &umounts);
}
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umounts);
@@ -2218,9 +2220,9 @@ void mnt_make_shortterm(struct vfsmount *m)
struct mount *mnt = real_mount(m);
if (atomic_add_unless(&mnt->mnt_longterm, -1, 1))
return;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
atomic_dec(&mnt->mnt_longterm);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
#endif
}
@@ -2250,9 +2252,9 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
return ERR_PTR(-ENOMEM);
}
new_ns->root = new;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
list_add_tail(&new_ns->list, &new->mnt_list);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
/*
* Second pass: switch the tsk->fs->* elements and mark new vfsmounts
@@ -2416,9 +2418,9 @@ bool is_path_reachable(struct mount *mnt, struct dentry *dentry,
int path_is_under(struct path *path1, struct path *path2)
{
int res;
- br_read_lock(vfsmount_lock);
+ br_read_lock(&vfsmount_lock);
res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);
- br_read_unlock(vfsmount_lock);
+ br_read_unlock(&vfsmount_lock);
return res;
}
EXPORT_SYMBOL(path_is_under);
@@ -2505,7 +2507,7 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
/* make sure we can reach put_old from new_root */
if (!is_path_reachable(real_mount(old.mnt), old.dentry, &new))
goto out4;
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
detach_mnt(new_mnt, &parent_path);
detach_mnt(root_mnt, &root_parent);
/* mount old root on put_old */
@@ -2513,7 +2515,7 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
/* mount new_root on / */
attach_mnt(new_mnt, &root_parent);
touch_mnt_namespace(current->nsproxy->mnt_ns);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
chroot_fs_refs(&root, &new);
error = 0;
out4:
@@ -2576,7 +2578,7 @@ void __init mnt_init(void)
for (u = 0; u < HASH_SIZE; u++)
INIT_LIST_HEAD(&mount_hashtable[u]);
- br_lock_init(vfsmount_lock);
+ br_lock_init(&vfsmount_lock);
err = sysfs_init();
if (err)
@@ -2596,9 +2598,9 @@ void put_mnt_ns(struct mnt_namespace *ns)
if (!atomic_dec_and_test(&ns->count))
return;
down_write(&namespace_sem);
- br_write_lock(vfsmount_lock);
+ br_write_lock(&vfsmount_lock);
umount_tree(ns->root, 0, &umount_list);
- br_write_unlock(vfsmount_lock);
+ br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
kfree(ns);
generated by cgit (git 2.34.1) at 2024-05-20 05:17:39 +0000