*/
#include <linux/syscalls.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-#include <linux/percpu.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/acct.h>
+#include <linux/export.h>
#include <linux/capability.h>
-#include <linux/cpumask.h>
-#include <linux/module.h>
-#include <linux/sysfs.h>
-#include <linux/seq_file.h>
#include <linux/mnt_namespace.h>
#include <linux/namei.h>
-#include <linux/nsproxy.h>
#include <linux/security.h>
-#include <linux/mount.h>
-#include <linux/ramfs.h>
-#include <linux/log2.h>
#include <linux/idr.h>
-#include <linux/fs_struct.h>
-#include <linux/fsnotify.h>
-#include <asm/uaccess.h>
-#include <asm/unistd.h>
+#include <linux/acct.h> /* acct_auto_close_mnt */
+#include <linux/ramfs.h> /* init_rootfs */
+#include <linux/fs_struct.h> /* get_fs_root et.al. */
+#include <linux/fsnotify.h> /* fsnotify_vfsmount_delete */
+#include <linux/uaccess.h>
#include "pnode.h"
#include "internal.h"
retry:
ida_pre_get(&mnt_id_ida, GFP_KERNEL);
spin_lock(&mnt_id_lock);
- res = ida_get_new_above(&mnt_id_ida, mnt_id_start, &mnt->mnt.mnt_id);
+ res = ida_get_new_above(&mnt_id_ida, mnt_id_start, &mnt->mnt_id);
if (!res)
- mnt_id_start = mnt->mnt.mnt_id + 1;
+ mnt_id_start = mnt->mnt_id + 1;
spin_unlock(&mnt_id_lock);
if (res == -EAGAIN)
goto retry;
static void mnt_free_id(struct mount *mnt)
{
- int id = mnt->mnt.mnt_id;
+ int id = mnt->mnt_id;
spin_lock(&mnt_id_lock);
ida_remove(&mnt_id_ida, id);
if (mnt_id_start > id)
res = ida_get_new_above(&mnt_group_ida,
mnt_group_start,
- &mnt->mnt.mnt_group_id);
+ &mnt->mnt_group_id);
if (!res)
- mnt_group_start = mnt->mnt.mnt_group_id + 1;
+ mnt_group_start = mnt->mnt_group_id + 1;
return res;
}
*/
void mnt_release_group_id(struct mount *mnt)
{
- int id = mnt->mnt.mnt_group_id;
+ int id = mnt->mnt_group_id;
ida_remove(&mnt_group_ida, id);
if (mnt_group_start > id)
mnt_group_start = id;
- mnt->mnt.mnt_group_id = 0;
+ mnt->mnt_group_id = 0;
}
/*
* vfsmount lock must be held for read
*/
-static inline void mnt_add_count(struct vfsmount *mnt, int n)
+static inline void mnt_add_count(struct mount *mnt, int n)
{
#ifdef CONFIG_SMP
this_cpu_add(mnt->mnt_pcp->mnt_count, n);
/*
* vfsmount lock must be held for write
*/
-unsigned int mnt_get_count(struct vfsmount *mnt)
+unsigned int mnt_get_count(struct mount *mnt)
{
#ifdef CONFIG_SMP
unsigned int count = 0;
static struct mount *alloc_vfsmnt(const char *name)
{
- struct mount *p = kmem_cache_zalloc(mnt_cache, GFP_KERNEL);
- if (p) {
- struct vfsmount *mnt = &p->mnt;
+ struct mount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL);
+ if (mnt) {
int err;
- err = mnt_alloc_id(p);
+ err = mnt_alloc_id(mnt);
if (err)
goto out_free_cache;
mnt->mnt_writers = 0;
#endif
- INIT_LIST_HEAD(&p->mnt_hash);
+ INIT_LIST_HEAD(&mnt->mnt_hash);
INIT_LIST_HEAD(&mnt->mnt_child);
INIT_LIST_HEAD(&mnt->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list);
INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks);
#endif
}
- return p;
+ return mnt;
#ifdef CONFIG_SMP
out_free_devname:
- kfree(p->mnt.mnt_devname);
+ kfree(mnt->mnt_devname);
#endif
out_free_id:
- mnt_free_id(p);
+ mnt_free_id(mnt);
out_free_cache:
- kmem_cache_free(mnt_cache, p);
+ kmem_cache_free(mnt_cache, mnt);
return NULL;
}
}
EXPORT_SYMBOL_GPL(__mnt_is_readonly);
-static inline void mnt_inc_writers(struct vfsmount *mnt)
+static inline void mnt_inc_writers(struct mount *mnt)
{
#ifdef CONFIG_SMP
this_cpu_inc(mnt->mnt_pcp->mnt_writers);
#endif
}
-static inline void mnt_dec_writers(struct vfsmount *mnt)
+static inline void mnt_dec_writers(struct mount *mnt)
{
#ifdef CONFIG_SMP
this_cpu_dec(mnt->mnt_pcp->mnt_writers);
#endif
}
-static unsigned int mnt_get_writers(struct vfsmount *mnt)
+static unsigned int mnt_get_writers(struct mount *mnt)
{
#ifdef CONFIG_SMP
unsigned int count = 0;
#endif
}
+static int mnt_is_readonly(struct vfsmount *mnt)
+{
+ if (mnt->mnt_sb->s_readonly_remount)
+ return 1;
+ /* Order wrt setting s_flags/s_readonly_remount in do_remount() */
+ smp_rmb();
+ return __mnt_is_readonly(mnt);
+}
+
/*
* Most r/o checks on a fs are for operations that take
* discrete amounts of time, like a write() or unlink().
*/
/**
* mnt_want_write - get write access to a mount
- * @mnt: the mount on which to take a write
+ * @m: the mount on which to take a write
*
* This tells the low-level filesystem that a write is
* about to be performed to it, and makes sure that
* the write operation is finished, mnt_drop_write()
* must be called. This is effectively a refcount.
*/
-int mnt_want_write(struct vfsmount *mnt)
+int mnt_want_write(struct vfsmount *m)
{
+ struct mount *mnt = real_mount(m);
int ret = 0;
preempt_disable();
* incremented count after it has set MNT_WRITE_HOLD.
*/
smp_mb();
- while (mnt->mnt_flags & MNT_WRITE_HOLD)
+ while (mnt->mnt.mnt_flags & MNT_WRITE_HOLD)
cpu_relax();
/*
* After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will
* MNT_WRITE_HOLD is cleared.
*/
smp_rmb();
- if (__mnt_is_readonly(mnt)) {
+ if (mnt_is_readonly(m)) {
mnt_dec_writers(mnt);
ret = -EROFS;
- goto out;
}
-out:
preempt_enable();
return ret;
}
if (__mnt_is_readonly(mnt))
return -EROFS;
preempt_disable();
- mnt_inc_writers(mnt);
+ mnt_inc_writers(real_mount(mnt));
preempt_enable();
return 0;
}
void mnt_drop_write(struct vfsmount *mnt)
{
preempt_disable();
- mnt_dec_writers(mnt);
+ mnt_dec_writers(real_mount(mnt));
preempt_enable();
}
EXPORT_SYMBOL_GPL(mnt_drop_write);
}
EXPORT_SYMBOL(mnt_drop_write_file);
-static int mnt_make_readonly(struct vfsmount *mnt)
+static int mnt_make_readonly(struct mount *mnt)
{
int ret = 0;
br_write_lock(vfsmount_lock);
- mnt->mnt_flags |= MNT_WRITE_HOLD;
+ mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
/*
* After storing MNT_WRITE_HOLD, we'll read the counters. This store
* should be visible before we do.
if (mnt_get_writers(mnt) > 0)
ret = -EBUSY;
else
- mnt->mnt_flags |= MNT_READONLY;
+ mnt->mnt.mnt_flags |= MNT_READONLY;
/*
* MNT_READONLY must become visible before ~MNT_WRITE_HOLD, so writers
* that become unheld will see MNT_READONLY.
*/
smp_wmb();
- mnt->mnt_flags &= ~MNT_WRITE_HOLD;
+ mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
br_write_unlock(vfsmount_lock);
return ret;
}
-static void __mnt_unmake_readonly(struct vfsmount *mnt)
+static void __mnt_unmake_readonly(struct mount *mnt)
{
br_write_lock(vfsmount_lock);
- mnt->mnt_flags &= ~MNT_READONLY;
+ mnt->mnt.mnt_flags &= ~MNT_READONLY;
br_write_unlock(vfsmount_lock);
}
+int sb_prepare_remount_readonly(struct super_block *sb)
+{
+ struct mount *mnt;
+ int err = 0;
+
+ /* Racy optimization. Recheck the counter under MNT_WRITE_HOLD */
+ if (atomic_long_read(&sb->s_remove_count))
+ return -EBUSY;
+
+ 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;
+ smp_mb();
+ if (mnt_get_writers(mnt) > 0) {
+ err = -EBUSY;
+ break;
+ }
+ }
+ }
+ if (!err && atomic_long_read(&sb->s_remove_count))
+ err = -EBUSY;
+
+ if (!err) {
+ sb->s_readonly_remount = 1;
+ smp_wmb();
+ }
+ list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) {
+ if (mnt->mnt.mnt_flags & MNT_WRITE_HOLD)
+ mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
+ }
+ br_write_unlock(vfsmount_lock);
+
+ return err;
+}
+
static void free_vfsmnt(struct mount *mnt)
{
- kfree(mnt->mnt.mnt_devname);
+ kfree(mnt->mnt_devname);
mnt_free_id(mnt);
#ifdef CONFIG_SMP
- free_percpu(mnt->mnt.mnt_pcp);
+ free_percpu(mnt->mnt_pcp);
#endif
kmem_cache_free(mnt_cache, mnt);
}
if (tmp == head)
break;
p = list_entry(tmp, struct mount, mnt_hash);
- if (p->mnt.mnt_parent == mnt && p->mnt.mnt_mountpoint == dentry) {
+ if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry) {
found = p;
break;
}
}
}
-static inline int check_mnt(struct vfsmount *mnt)
+static inline int check_mnt(struct mount *mnt)
{
return mnt->mnt_ns == current->nsproxy->mnt_ns;
}
struct mount *p;
list_for_each_entry(p, &mount_hashtable[u], mnt_hash) {
- if (p->mnt.mnt_mountpoint == dentry)
+ if (p->mnt_mountpoint == dentry)
return;
}
}
*/
static void detach_mnt(struct mount *mnt, struct path *old_path)
{
- old_path->dentry = mnt->mnt.mnt_mountpoint;
- old_path->mnt = mnt->mnt.mnt_parent;
- mnt->mnt.mnt_parent = &mnt->mnt;
- mnt->mnt.mnt_mountpoint = mnt->mnt.mnt_root;
- list_del_init(&mnt->mnt.mnt_child);
+ old_path->dentry = mnt->mnt_mountpoint;
+ old_path->mnt = &mnt->mnt_parent->mnt;
+ mnt->mnt_parent = mnt;
+ 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);
}
/*
* vfsmount lock must be held for write
*/
-void mnt_set_mountpoint(struct vfsmount *mnt, struct dentry *dentry,
+void mnt_set_mountpoint(struct mount *mnt, struct dentry *dentry,
struct mount *child_mnt)
{
- child_mnt->mnt.mnt_parent = mntget(mnt);
- child_mnt->mnt.mnt_mountpoint = dget(dentry);
+ mnt_add_count(mnt, 1); /* essentially, that's mntget */
+ child_mnt->mnt_mountpoint = dget(dentry);
+ child_mnt->mnt_parent = mnt;
spin_lock(&dentry->d_lock);
dentry->d_flags |= DCACHE_MOUNTED;
spin_unlock(&dentry->d_lock);
*/
static void attach_mnt(struct mount *mnt, struct path *path)
{
- mnt_set_mountpoint(path->mnt, path->dentry, mnt);
+ mnt_set_mountpoint(real_mount(path->mnt), path->dentry, mnt);
list_add_tail(&mnt->mnt_hash, mount_hashtable +
hash(path->mnt, path->dentry));
- list_add_tail(&mnt->mnt.mnt_child, &path->mnt->mnt_mounts);
+ list_add_tail(&mnt->mnt_child, &real_mount(path->mnt)->mnt_mounts);
}
-static inline void __mnt_make_longterm(struct vfsmount *mnt)
+static inline void __mnt_make_longterm(struct mount *mnt)
{
#ifdef CONFIG_SMP
atomic_inc(&mnt->mnt_longterm);
}
/* needs vfsmount lock for write */
-static inline void __mnt_make_shortterm(struct vfsmount *mnt)
+static inline void __mnt_make_shortterm(struct mount *mnt)
{
#ifdef CONFIG_SMP
atomic_dec(&mnt->mnt_longterm);
*/
static void commit_tree(struct mount *mnt)
{
- struct vfsmount *parent = mnt->mnt.mnt_parent;
- struct vfsmount *m;
+ struct mount *parent = mnt->mnt_parent;
+ struct mount *m;
LIST_HEAD(head);
struct mnt_namespace *n = parent->mnt_ns;
- BUG_ON(parent == &mnt->mnt);
+ BUG_ON(parent == mnt);
- list_add_tail(&head, &mnt->mnt.mnt_list);
+ list_add_tail(&head, &mnt->mnt_list);
list_for_each_entry(m, &head, mnt_list) {
m->mnt_ns = n;
__mnt_make_longterm(m);
list_splice(&head, n->list.prev);
list_add_tail(&mnt->mnt_hash, mount_hashtable +
- hash(parent, mnt->mnt.mnt_mountpoint));
- list_add_tail(&mnt->mnt.mnt_child, &parent->mnt_mounts);
+ hash(&parent->mnt, mnt->mnt_mountpoint));
+ list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
touch_mnt_namespace(n);
}
-static struct mount *next_mnt(struct mount *p, struct vfsmount *root)
+static struct mount *next_mnt(struct mount *p, struct mount *root)
{
- struct list_head *next = p->mnt.mnt_mounts.next;
- if (next == &p->mnt.mnt_mounts) {
+ struct list_head *next = p->mnt_mounts.next;
+ if (next == &p->mnt_mounts) {
while (1) {
- if (&p->mnt == root)
+ if (p == root)
return NULL;
- next = p->mnt.mnt_child.next;
- if (next != &p->mnt.mnt_parent->mnt_mounts)
+ next = p->mnt_child.next;
+ if (next != &p->mnt_parent->mnt_mounts)
break;
- p = real_mount(p->mnt.mnt_parent);
+ p = p->mnt_parent;
}
}
- return list_entry(next, struct mount, mnt.mnt_child);
+ return list_entry(next, struct mount, mnt_child);
}
static struct mount *skip_mnt_tree(struct mount *p)
{
- struct list_head *prev = p->mnt.mnt_mounts.prev;
- while (prev != &p->mnt.mnt_mounts) {
- p = list_entry(prev, struct mount, mnt.mnt_child);
- prev = p->mnt.mnt_mounts.prev;
+ struct list_head *prev = p->mnt_mounts.prev;
+ while (prev != &p->mnt_mounts) {
+ p = list_entry(prev, struct mount, mnt_child);
+ prev = p->mnt_mounts.prev;
}
return p;
}
mnt->mnt.mnt_root = root;
mnt->mnt.mnt_sb = root->d_sb;
- mnt->mnt.mnt_mountpoint = mnt->mnt.mnt_root;
- mnt->mnt.mnt_parent = &mnt->mnt;
+ mnt->mnt_mountpoint = mnt->mnt.mnt_root;
+ mnt->mnt_parent = mnt;
+ br_write_lock(vfsmount_lock);
+ list_add_tail(&mnt->mnt_instance, &root->d_sb->s_mounts);
+ br_write_unlock(vfsmount_lock);
return &mnt->mnt;
}
EXPORT_SYMBOL_GPL(vfs_kern_mount);
int flag)
{
struct super_block *sb = old->mnt.mnt_sb;
- struct mount *mnt = alloc_vfsmnt(old->mnt.mnt_devname);
+ struct mount *mnt = alloc_vfsmnt(old->mnt_devname);
if (mnt) {
if (flag & (CL_SLAVE | CL_PRIVATE))
- mnt->mnt.mnt_group_id = 0; /* not a peer of original */
+ mnt->mnt_group_id = 0; /* not a peer of original */
else
- mnt->mnt.mnt_group_id = old->mnt.mnt_group_id;
+ mnt->mnt_group_id = old->mnt_group_id;
- if ((flag & CL_MAKE_SHARED) && !mnt->mnt.mnt_group_id) {
+ if ((flag & CL_MAKE_SHARED) && !mnt->mnt_group_id) {
int err = mnt_alloc_group_id(mnt);
if (err)
goto out_free;
atomic_inc(&sb->s_active);
mnt->mnt.mnt_sb = sb;
mnt->mnt.mnt_root = dget(root);
- mnt->mnt.mnt_mountpoint = mnt->mnt.mnt_root;
- mnt->mnt.mnt_parent = &mnt->mnt;
+ mnt->mnt_mountpoint = mnt->mnt.mnt_root;
+ mnt->mnt_parent = mnt;
+ br_write_lock(vfsmount_lock);
+ list_add_tail(&mnt->mnt_instance, &sb->s_mounts);
+ br_write_unlock(vfsmount_lock);
if (flag & CL_SLAVE) {
- list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave_list);
- mnt->mnt.mnt_master = &old->mnt;
- CLEAR_MNT_SHARED(&mnt->mnt);
+ list_add(&mnt->mnt_slave, &old->mnt_slave_list);
+ mnt->mnt_master = old;
+ CLEAR_MNT_SHARED(mnt);
} else if (!(flag & CL_PRIVATE)) {
- if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(&old->mnt))
- list_add(&mnt->mnt.mnt_share, &old->mnt.mnt_share);
- if (IS_MNT_SLAVE(&old->mnt))
- list_add(&mnt->mnt.mnt_slave, &old->mnt.mnt_slave);
- mnt->mnt.mnt_master = old->mnt.mnt_master;
+ if ((flag & CL_MAKE_SHARED) || IS_MNT_SHARED(old))
+ list_add(&mnt->mnt_share, &old->mnt_share);
+ if (IS_MNT_SLAVE(old))
+ list_add(&mnt->mnt_slave, &old->mnt_slave);
+ mnt->mnt_master = old->mnt_master;
}
if (flag & CL_MAKE_SHARED)
set_mnt_shared(mnt);
/* stick the duplicate mount on the same expiry list
* as the original if that was on one */
if (flag & CL_EXPIRE) {
- if (!list_empty(&old->mnt.mnt_expire))
- list_add(&mnt->mnt.mnt_expire, &old->mnt.mnt_expire);
+ if (!list_empty(&old->mnt_expire))
+ list_add(&mnt->mnt_expire, &old->mnt_expire);
}
}
return mnt;
return NULL;
}
-static inline void mntfree(struct vfsmount *mnt)
+static inline void mntfree(struct mount *mnt)
{
- struct super_block *sb = mnt->mnt_sb;
+ struct vfsmount *m = &mnt->mnt;
+ struct super_block *sb = m->mnt_sb;
/*
* This probably indicates that somebody messed
* so mnt_get_writers() below is safe.
*/
WARN_ON(mnt_get_writers(mnt));
- fsnotify_vfsmount_delete(mnt);
- dput(mnt->mnt_root);
- free_vfsmnt(real_mount(mnt));
+ fsnotify_vfsmount_delete(m);
+ dput(m->mnt_root);
+ free_vfsmnt(mnt);
deactivate_super(sb);
}
-static void mntput_no_expire(struct vfsmount *mnt)
+static void mntput_no_expire(struct mount *mnt)
{
put_again:
#ifdef CONFIG_SMP
mnt_add_count(mnt, mnt->mnt_pinned + 1);
mnt->mnt_pinned = 0;
br_write_unlock(vfsmount_lock);
- acct_auto_close_mnt(mnt);
+ acct_auto_close_mnt(&mnt->mnt);
goto put_again;
}
+ list_del(&mnt->mnt_instance);
br_write_unlock(vfsmount_lock);
mntfree(mnt);
}
void mntput(struct vfsmount *mnt)
{
if (mnt) {
+ struct mount *m = real_mount(mnt);
/* avoid cacheline pingpong, hope gcc doesn't get "smart" */
- if (unlikely(mnt->mnt_expiry_mark))
- mnt->mnt_expiry_mark = 0;
- mntput_no_expire(mnt);
+ if (unlikely(m->mnt_expiry_mark))
+ m->mnt_expiry_mark = 0;
+ mntput_no_expire(m);
}
}
EXPORT_SYMBOL(mntput);
struct vfsmount *mntget(struct vfsmount *mnt)
{
if (mnt)
- mnt_add_count(mnt, 1);
+ mnt_add_count(real_mount(mnt), 1);
return mnt;
}
EXPORT_SYMBOL(mntget);
void mnt_pin(struct vfsmount *mnt)
{
br_write_lock(vfsmount_lock);
- mnt->mnt_pinned++;
+ real_mount(mnt)->mnt_pinned++;
br_write_unlock(vfsmount_lock);
}
EXPORT_SYMBOL(mnt_pin);
-void mnt_unpin(struct vfsmount *mnt)
+void mnt_unpin(struct vfsmount *m)
{
+ struct mount *mnt = real_mount(m);
br_write_lock(vfsmount_lock);
if (mnt->mnt_pinned) {
mnt_add_count(mnt, 1);
*
* See also save_mount_options().
*/
-int generic_show_options(struct seq_file *m, struct vfsmount *mnt)
+int generic_show_options(struct seq_file *m, struct dentry *root)
{
const char *options;
rcu_read_lock();
- options = rcu_dereference(mnt->mnt_sb->s_options);
+ options = rcu_dereference(root->d_sb->s_options);
if (options != NULL && options[0]) {
seq_putc(m, ',');
EXPORT_SYMBOL(replace_mount_options);
#ifdef CONFIG_PROC_FS
-/* iterator */
+/* iterator; we want it to have access to namespace_sem, thus here... */
static void *m_start(struct seq_file *m, loff_t *pos)
{
- struct proc_mounts *p = m->private;
+ struct proc_mounts *p = container_of(m, struct proc_mounts, m);
down_read(&namespace_sem);
return seq_list_start(&p->ns->list, *pos);
static void *m_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct proc_mounts *p = m->private;
+ struct proc_mounts *p = container_of(m, struct proc_mounts, m);
return seq_list_next(v, &p->ns->list, pos);
}
up_read(&namespace_sem);
}
-int mnt_had_events(struct proc_mounts *p)
-{
- struct mnt_namespace *ns = p->ns;
- int res = 0;
-
- br_read_lock(vfsmount_lock);
- if (p->m.poll_event != ns->event) {
- p->m.poll_event = ns->event;
- res = 1;
- }
- br_read_unlock(vfsmount_lock);
-
- return res;
-}
-
-struct proc_fs_info {
- int flag;
- const char *str;
-};
-
-static int show_sb_opts(struct seq_file *m, struct super_block *sb)
-{
- static const struct proc_fs_info fs_info[] = {
- { MS_SYNCHRONOUS, ",sync" },
- { MS_DIRSYNC, ",dirsync" },
- { MS_MANDLOCK, ",mand" },
- { 0, NULL }
- };
- const struct proc_fs_info *fs_infop;
-
- for (fs_infop = fs_info; fs_infop->flag; fs_infop++) {
- if (sb->s_flags & fs_infop->flag)
- seq_puts(m, fs_infop->str);
- }
-
- return security_sb_show_options(m, sb);
-}
-
-static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
-{
- static const struct proc_fs_info mnt_info[] = {
- { MNT_NOSUID, ",nosuid" },
- { MNT_NODEV, ",nodev" },
- { MNT_NOEXEC, ",noexec" },
- { MNT_NOATIME, ",noatime" },
- { MNT_NODIRATIME, ",nodiratime" },
- { MNT_RELATIME, ",relatime" },
- { 0, NULL }
- };
- const struct proc_fs_info *fs_infop;
-
- for (fs_infop = mnt_info; fs_infop->flag; fs_infop++) {
- if (mnt->mnt_flags & fs_infop->flag)
- seq_puts(m, fs_infop->str);
- }
-}
-
-static void show_type(struct seq_file *m, struct super_block *sb)
-{
- mangle(m, sb->s_type->name);
- if (sb->s_subtype && sb->s_subtype[0]) {
- seq_putc(m, '.');
- mangle(m, sb->s_subtype);
- }
-}
-
-static int show_vfsmnt(struct seq_file *m, void *v)
+static int m_show(struct seq_file *m, void *v)
{
- struct vfsmount *mnt = list_entry(v, struct vfsmount, mnt_list);
- int err = 0;
- struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
-
- if (mnt->mnt_sb->s_op->show_devname) {
- err = mnt->mnt_sb->s_op->show_devname(m, mnt);
- if (err)
- goto out;
- } else {
- mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
- }
- seq_putc(m, ' ');
- seq_path(m, &mnt_path, " \t\n\\");
- seq_putc(m, ' ');
- show_type(m, mnt->mnt_sb);
- seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
- err = show_sb_opts(m, mnt->mnt_sb);
- if (err)
- goto out;
- show_mnt_opts(m, mnt);
- if (mnt->mnt_sb->s_op->show_options)
- err = mnt->mnt_sb->s_op->show_options(m, mnt);
- seq_puts(m, " 0 0\n");
-out:
- return err;
+ struct proc_mounts *p = container_of(m, struct proc_mounts, m);
+ struct mount *r = list_entry(v, struct mount, mnt_list);
+ return p->show(m, &r->mnt);
}
const struct seq_operations mounts_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
- .show = show_vfsmnt
-};
-
-static int show_mountinfo(struct seq_file *m, void *v)
-{
- struct proc_mounts *p = m->private;
- struct vfsmount *mnt = list_entry(v, struct vfsmount, mnt_list);
- struct super_block *sb = mnt->mnt_sb;
- struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
- struct path root = p->root;
- int err = 0;
-
- seq_printf(m, "%i %i %u:%u ", mnt->mnt_id, mnt->mnt_parent->mnt_id,
- MAJOR(sb->s_dev), MINOR(sb->s_dev));
- if (sb->s_op->show_path)
- err = sb->s_op->show_path(m, mnt);
- else
- seq_dentry(m, mnt->mnt_root, " \t\n\\");
- if (err)
- goto out;
- seq_putc(m, ' ');
-
- /* mountpoints outside of chroot jail will give SEQ_SKIP on this */
- err = seq_path_root(m, &mnt_path, &root, " \t\n\\");
- if (err)
- goto out;
-
- seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");
- show_mnt_opts(m, mnt);
-
- /* Tagged fields ("foo:X" or "bar") */
- if (IS_MNT_SHARED(mnt))
- seq_printf(m, " shared:%i", mnt->mnt_group_id);
- if (IS_MNT_SLAVE(mnt)) {
- int master = mnt->mnt_master->mnt_group_id;
- int dom = get_dominating_id(mnt, &p->root);
- seq_printf(m, " master:%i", master);
- if (dom && dom != master)
- seq_printf(m, " propagate_from:%i", dom);
- }
- if (IS_MNT_UNBINDABLE(mnt))
- seq_puts(m, " unbindable");
-
- /* Filesystem specific data */
- seq_puts(m, " - ");
- show_type(m, sb);
- seq_putc(m, ' ');
- if (sb->s_op->show_devname)
- err = sb->s_op->show_devname(m, mnt);
- else
- mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
- if (err)
- goto out;
- seq_puts(m, sb->s_flags & MS_RDONLY ? " ro" : " rw");
- err = show_sb_opts(m, sb);
- if (err)
- goto out;
- if (sb->s_op->show_options)
- err = sb->s_op->show_options(m, mnt);
- seq_putc(m, '\n');
-out:
- return err;
-}
-
-const struct seq_operations mountinfo_op = {
- .start = m_start,
- .next = m_next,
- .stop = m_stop,
- .show = show_mountinfo,
-};
-
-static int show_vfsstat(struct seq_file *m, void *v)
-{
- struct vfsmount *mnt = list_entry(v, struct vfsmount, mnt_list);
- struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
- int err = 0;
-
- /* device */
- if (mnt->mnt_sb->s_op->show_devname) {
- seq_puts(m, "device ");
- err = mnt->mnt_sb->s_op->show_devname(m, mnt);
- } else {
- if (mnt->mnt_devname) {
- seq_puts(m, "device ");
- mangle(m, mnt->mnt_devname);
- } else
- seq_puts(m, "no device");
- }
-
- /* mount point */
- seq_puts(m, " mounted on ");
- seq_path(m, &mnt_path, " \t\n\\");
- seq_putc(m, ' ');
-
- /* file system type */
- seq_puts(m, "with fstype ");
- show_type(m, mnt->mnt_sb);
-
- /* optional statistics */
- if (mnt->mnt_sb->s_op->show_stats) {
- seq_putc(m, ' ');
- if (!err)
- err = mnt->mnt_sb->s_op->show_stats(m, mnt);
- }
-
- seq_putc(m, '\n');
- return err;
-}
-
-const struct seq_operations mountstats_op = {
- .start = m_start,
- .next = m_next,
- .stop = m_stop,
- .show = show_vfsstat,
+ .show = m_show,
};
#endif /* CONFIG_PROC_FS */
* open files, pwds, chroots or sub mounts that are
* busy.
*/
-int may_umount_tree(struct vfsmount *mnt)
+int may_umount_tree(struct vfsmount *m)
{
+ struct mount *mnt = real_mount(m);
int actual_refs = 0;
int minimum_refs = 0;
struct mount *p;
- BUG_ON(!mnt);
+ BUG_ON(!m);
/* write lock needed for mnt_get_count */
br_write_lock(vfsmount_lock);
- for (p = real_mount(mnt); p; p = next_mnt(p, mnt)) {
- actual_refs += mnt_get_count(&p->mnt);
+ for (p = mnt; p; p = next_mnt(p, mnt)) {
+ actual_refs += mnt_get_count(p);
minimum_refs += 2;
}
br_write_unlock(vfsmount_lock);
int ret = 1;
down_read(&namespace_sem);
br_write_lock(vfsmount_lock);
- if (propagate_mount_busy(mnt, 2))
+ if (propagate_mount_busy(real_mount(mnt), 2))
ret = 0;
br_write_unlock(vfsmount_lock);
up_read(&namespace_sem);
while (!list_empty(head)) {
mnt = list_first_entry(head, struct mount, mnt_hash);
list_del_init(&mnt->mnt_hash);
- if (mnt_has_parent(&mnt->mnt)) {
+ if (mnt_has_parent(mnt)) {
struct dentry *dentry;
- struct vfsmount *m;
+ struct mount *m;
br_write_lock(vfsmount_lock);
- dentry = mnt->mnt.mnt_mountpoint;
- m = mnt->mnt.mnt_parent;
- mnt->mnt.mnt_mountpoint = mnt->mnt.mnt_root;
- mnt->mnt.mnt_parent = &mnt->mnt;
+ 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);
dput(dentry);
- mntput(m);
+ mntput(&m->mnt);
}
mntput(&mnt->mnt);
}
LIST_HEAD(tmp_list);
struct mount *p;
- for (p = mnt; p; p = next_mnt(p, &mnt->mnt))
+ for (p = mnt; p; p = next_mnt(p, mnt))
list_move(&p->mnt_hash, &tmp_list);
if (propagate)
propagate_umount(&tmp_list);
list_for_each_entry(p, &tmp_list, mnt_hash) {
- list_del_init(&p->mnt.mnt_expire);
- list_del_init(&p->mnt.mnt_list);
- __touch_mnt_namespace(p->mnt.mnt_ns);
- p->mnt.mnt_ns = NULL;
- __mnt_make_shortterm(&p->mnt);
- list_del_init(&p->mnt.mnt_child);
- if (mnt_has_parent(&p->mnt)) {
- p->mnt.mnt_parent->mnt_ghosts++;
- dentry_reset_mounted(p->mnt.mnt_mountpoint);
+ list_del_init(&p->mnt_expire);
+ list_del_init(&p->mnt_list);
+ __touch_mnt_namespace(p->mnt_ns);
+ p->mnt_ns = NULL;
+ __mnt_make_shortterm(p);
+ list_del_init(&p->mnt_child);
+ if (mnt_has_parent(p)) {
+ p->mnt_parent->mnt_ghosts++;
+ dentry_reset_mounted(p->mnt_mountpoint);
}
change_mnt_propagation(p, MS_PRIVATE);
}
static void shrink_submounts(struct mount *mnt, struct list_head *umounts);
-static int do_umount(struct vfsmount *mnt, int flags)
+static int do_umount(struct mount *mnt, int flags)
{
- struct super_block *sb = mnt->mnt_sb;
+ struct super_block *sb = mnt->mnt.mnt_sb;
int retval;
LIST_HEAD(umount_list);
- retval = security_sb_umount(mnt, flags);
+ retval = security_sb_umount(&mnt->mnt, flags);
if (retval)
return retval;
* (2) the usage count == 1 [parent vfsmount] + 1 [sys_umount]
*/
if (flags & MNT_EXPIRE) {
- if (mnt == current->fs->root.mnt ||
+ if (&mnt->mnt == current->fs->root.mnt ||
flags & (MNT_FORCE | MNT_DETACH))
return -EINVAL;
* /reboot - static binary that would close all descriptors and
* call reboot(9). Then init(8) could umount root and exec /reboot.
*/
- if (mnt == current->fs->root.mnt && !(flags & MNT_DETACH)) {
+ if (&mnt->mnt == current->fs->root.mnt && !(flags & MNT_DETACH)) {
/*
* Special case for "unmounting" root ...
* we just try to remount it readonly.
event++;
if (!(flags & MNT_DETACH))
- shrink_submounts(real_mount(mnt), &umount_list);
+ shrink_submounts(mnt, &umount_list);
retval = -EBUSY;
if (flags & MNT_DETACH || !propagate_mount_busy(mnt, 2)) {
if (!list_empty(&mnt->mnt_list))
- umount_tree(real_mount(mnt), 1, &umount_list);
+ umount_tree(mnt, 1, &umount_list);
retval = 0;
}
br_write_unlock(vfsmount_lock);
SYSCALL_DEFINE2(umount, char __user *, name, int, flags)
{
struct path path;
+ struct mount *mnt;
int retval;
int lookup_flags = 0;
retval = user_path_at(AT_FDCWD, name, lookup_flags, &path);
if (retval)
goto out;
+ mnt = real_mount(path.mnt);
retval = -EINVAL;
if (path.dentry != path.mnt->mnt_root)
goto dput_and_out;
- if (!check_mnt(path.mnt))
+ if (!check_mnt(mnt))
goto dput_and_out;
retval = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto dput_and_out;
- retval = do_umount(path.mnt, flags);
+ retval = do_umount(mnt, flags);
dput_and_out:
/* we mustn't call path_put() as that would clear mnt_expiry_mark */
dput(path.dentry);
- mntput_no_expire(path.mnt);
+ mntput_no_expire(mnt);
out:
return retval;
}
struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
int flag)
{
- struct mount *res, *p, *q;
- struct vfsmount *r;
+ struct mount *res, *p, *q, *r;
struct path path;
- if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(&mnt->mnt))
+ if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(mnt))
return NULL;
res = q = clone_mnt(mnt, dentry, flag);
if (!q)
goto Enomem;
- q->mnt.mnt_mountpoint = mnt->mnt.mnt_mountpoint;
+ q->mnt_mountpoint = mnt->mnt_mountpoint;
p = mnt;
- list_for_each_entry(r, &mnt->mnt.mnt_mounts, mnt_child) {
+ list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) {
struct mount *s;
if (!is_subdir(r->mnt_mountpoint, dentry))
continue;
- for (s = real_mount(r); s; s = next_mnt(s, r)) {
- if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(&s->mnt)) {
+ for (s = r; s; s = next_mnt(s, r)) {
+ if (!(flag & CL_COPY_ALL) && IS_MNT_UNBINDABLE(s)) {
s = skip_mnt_tree(s);
continue;
}
- while (p != real_mount(s->mnt.mnt_parent)) {
- p = real_mount(p->mnt.mnt_parent);
- q = real_mount(q->mnt.mnt_parent);
+ while (p != s->mnt_parent) {
+ p = p->mnt_parent;
+ q = q->mnt_parent;
}
p = s;
path.mnt = &q->mnt;
- path.dentry = p->mnt.mnt_mountpoint;
+ path.dentry = p->mnt_mountpoint;
q = clone_mnt(p, p->mnt.mnt_root, flag);
if (!q)
goto Enomem;
br_write_lock(vfsmount_lock);
- list_add_tail(&q->mnt.mnt_list, &res->mnt.mnt_list);
+ list_add_tail(&q->mnt_list, &res->mnt_list);
attach_mnt(q, &path);
br_write_unlock(vfsmount_lock);
}
int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
struct vfsmount *root)
{
- struct vfsmount *mnt;
+ struct mount *mnt;
int res = f(root, arg);
if (res)
return res;
- list_for_each_entry(mnt, &root->mnt_list, mnt_list) {
- res = f(mnt, arg);
+ list_for_each_entry(mnt, &real_mount(root)->mnt_list, mnt_list) {
+ res = f(&mnt->mnt, arg);
if (res)
return res;
}
{
struct mount *p;
- for (p = mnt; p != end; p = next_mnt(p, &mnt->mnt)) {
- if (p->mnt.mnt_group_id && !IS_MNT_SHARED(&p->mnt))
+ for (p = mnt; p != end; p = next_mnt(p, mnt)) {
+ if (p->mnt_group_id && !IS_MNT_SHARED(p))
mnt_release_group_id(p);
}
}
{
struct mount *p;
- for (p = mnt; p; p = recurse ? next_mnt(p, &mnt->mnt) : NULL) {
- if (!p->mnt.mnt_group_id && !IS_MNT_SHARED(&p->mnt)) {
+ for (p = mnt; p; p = recurse ? next_mnt(p, mnt) : NULL) {
+ if (!p->mnt_group_id && !IS_MNT_SHARED(p)) {
int err = mnt_alloc_group_id(p);
if (err) {
cleanup_group_ids(mnt, p);
struct path *path, struct path *parent_path)
{
LIST_HEAD(tree_list);
- struct vfsmount *dest_mnt = path->mnt;
+ struct mount *dest_mnt = real_mount(path->mnt);
struct dentry *dest_dentry = path->dentry;
struct mount *child, *p;
int err;
if (err)
goto out;
}
- err = propagate_mnt(dest_mnt, dest_dentry, &source_mnt->mnt, &tree_list);
+ err = propagate_mnt(dest_mnt, dest_dentry, source_mnt, &tree_list);
if (err)
goto out_cleanup_ids;
br_write_lock(vfsmount_lock);
if (IS_MNT_SHARED(dest_mnt)) {
- for (p = source_mnt; p; p = next_mnt(p, &source_mnt->mnt))
+ for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p);
}
if (parent_path) {
detach_mnt(source_mnt, parent_path);
attach_mnt(source_mnt, path);
- touch_mnt_namespace(parent_path->mnt->mnt_ns);
+ touch_mnt_namespace(source_mnt->mnt_ns);
} else {
mnt_set_mountpoint(dest_mnt, dest_dentry, source_mnt);
commit_tree(source_mnt);
mutex_unlock(&path->dentry->d_inode->i_mutex);
}
-static int graft_tree(struct vfsmount *mnt, struct path *path)
+static int graft_tree(struct mount *mnt, struct path *path)
{
- if (mnt->mnt_sb->s_flags & MS_NOUSER)
+ if (mnt->mnt.mnt_sb->s_flags & MS_NOUSER)
return -EINVAL;
if (S_ISDIR(path->dentry->d_inode->i_mode) !=
- S_ISDIR(mnt->mnt_root->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(real_mount(mnt), path, NULL);
+ return attach_recursive_mnt(mnt, path, NULL);
}
/*
}
br_write_lock(vfsmount_lock);
- for (m = mnt; m; m = (recurse ? next_mnt(m, &mnt->mnt) : NULL))
+ for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL))
change_mnt_propagation(m, type);
br_write_unlock(vfsmount_lock);
old = real_mount(old_path.mnt);
err = -EINVAL;
- if (IS_MNT_UNBINDABLE(old_path.mnt))
+ if (IS_MNT_UNBINDABLE(old))
goto out2;
- if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
+ if (!check_mnt(real_mount(path->mnt)) || !check_mnt(old))
goto out2;
err = -ENOMEM;
if (!mnt)
goto out2;
- err = graft_tree(&mnt->mnt, path);
+ err = graft_tree(mnt, path);
if (err) {
br_write_lock(vfsmount_lock);
umount_tree(mnt, 0, &umount_list);
return 0;
if (readonly_request)
- error = mnt_make_readonly(mnt);
+ error = mnt_make_readonly(real_mount(mnt));
else
- __mnt_unmake_readonly(mnt);
+ __mnt_unmake_readonly(real_mount(mnt));
return error;
}
{
int err;
struct super_block *sb = path->mnt->mnt_sb;
+ struct mount *mnt = real_mount(path->mnt);
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (!check_mnt(path->mnt))
+ if (!check_mnt(mnt))
return -EINVAL;
if (path->dentry != path->mnt->mnt_root)
err = do_remount_sb(sb, flags, data, 0);
if (!err) {
br_write_lock(vfsmount_lock);
- mnt_flags |= path->mnt->mnt_flags & MNT_PROPAGATION_MASK;
- path->mnt->mnt_flags = mnt_flags;
+ mnt_flags |= mnt->mnt.mnt_flags & MNT_PROPAGATION_MASK;
+ mnt->mnt.mnt_flags = mnt_flags;
br_write_unlock(vfsmount_lock);
}
up_write(&sb->s_umount);
if (!err) {
br_write_lock(vfsmount_lock);
- touch_mnt_namespace(path->mnt->mnt_ns);
+ touch_mnt_namespace(mnt->mnt_ns);
br_write_unlock(vfsmount_lock);
}
return err;
static inline int tree_contains_unbindable(struct mount *mnt)
{
struct mount *p;
- for (p = mnt; p; p = next_mnt(p, &mnt->mnt)) {
- if (IS_MNT_UNBINDABLE(&p->mnt))
+ for (p = mnt; p; p = next_mnt(p, mnt)) {
+ if (IS_MNT_UNBINDABLE(p))
return 1;
}
return 0;
static int do_move_mount(struct path *path, char *old_name)
{
struct path old_path, parent_path;
- struct vfsmount *p;
+ struct mount *p;
struct mount *old;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
if (err < 0)
goto out;
+ old = real_mount(old_path.mnt);
+ p = real_mount(path->mnt);
+
err = -EINVAL;
- if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
+ if (!check_mnt(p) || !check_mnt(old))
goto out1;
if (d_unlinked(path->dentry))
if (old_path.dentry != old_path.mnt->mnt_root)
goto out1;
- old = real_mount(old_path.mnt);
-
- if (!mnt_has_parent(old_path.mnt))
+ if (!mnt_has_parent(old))
goto out1;
if (S_ISDIR(path->dentry->d_inode->i_mode) !=
/*
* Don't move a mount residing in a shared parent.
*/
- if (IS_MNT_SHARED(old_path.mnt->mnt_parent))
+ if (IS_MNT_SHARED(old->mnt_parent))
goto out1;
/*
* Don't move a mount tree containing unbindable mounts to a destination
* mount which is shared.
*/
- if (IS_MNT_SHARED(path->mnt) &&
- tree_contains_unbindable(old))
+ if (IS_MNT_SHARED(p) && tree_contains_unbindable(old))
goto out1;
err = -ELOOP;
- for (p = path->mnt; mnt_has_parent(p); p = p->mnt_parent)
- if (p == old_path.mnt)
+ for (; mnt_has_parent(p); p = p->mnt_parent)
+ if (p == old)
goto out1;
err = attach_recursive_mnt(old, path, &parent_path);
/* if the mount is moved, it should no longer be expire
* automatically */
- list_del_init(&old_path.mnt->mnt_expire);
+ list_del_init(&old->mnt_expire);
out1:
unlock_mount(path);
out:
/*
* add a mount into a namespace's mount tree
*/
-static int do_add_mount(struct vfsmount *newmnt, struct path *path, int mnt_flags)
+static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
{
int err;
return err;
err = -EINVAL;
- if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
+ if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(real_mount(path->mnt)))
goto unlock;
/* Refuse the same filesystem on the same mount point */
err = -EBUSY;
- if (path->mnt->mnt_sb == newmnt->mnt_sb &&
+ if (path->mnt->mnt_sb == newmnt->mnt.mnt_sb &&
path->mnt->mnt_root == path->dentry)
goto unlock;
err = -EINVAL;
- if (S_ISLNK(newmnt->mnt_root->d_inode->i_mode))
+ if (S_ISLNK(newmnt->mnt.mnt_root->d_inode->i_mode))
goto unlock;
- newmnt->mnt_flags = mnt_flags;
+ newmnt->mnt.mnt_flags = mnt_flags;
err = graft_tree(newmnt, path);
unlock:
if (IS_ERR(mnt))
return PTR_ERR(mnt);
- err = do_add_mount(mnt, path, mnt_flags);
+ err = do_add_mount(real_mount(mnt), path, mnt_flags);
if (err)
mntput(mnt);
return err;
int finish_automount(struct vfsmount *m, struct path *path)
{
+ struct mount *mnt = real_mount(m);
int err;
/* The new mount record should have at least 2 refs to prevent it being
* expired before we get a chance to add it
*/
- BUG_ON(mnt_get_count(m) < 2);
+ BUG_ON(mnt_get_count(mnt) < 2);
if (m->mnt_sb == path->mnt->mnt_sb &&
m->mnt_root == path->dentry) {
goto fail;
}
- err = do_add_mount(m, path, path->mnt->mnt_flags | MNT_SHRINKABLE);
+ err = do_add_mount(mnt, path, path->mnt->mnt_flags | MNT_SHRINKABLE);
if (!err)
return 0;
fail:
/* remove m from any expiration list it may be on */
- if (!list_empty(&m->mnt_expire)) {
+ if (!list_empty(&mnt->mnt_expire)) {
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
- list_del_init(&m->mnt_expire);
+ list_del_init(&mnt->mnt_expire);
br_write_unlock(vfsmount_lock);
up_write(&namespace_sem);
}
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
- list_add_tail(&mnt->mnt_expire, expiry_list);
+ list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list);
br_write_unlock(vfsmount_lock);
up_write(&namespace_sem);
* - still marked for expiry (marked on the last call here; marks are
* cleared by mntput())
*/
- list_for_each_entry_safe(mnt, next, mounts, mnt.mnt_expire) {
- if (!xchg(&mnt->mnt.mnt_expiry_mark, 1) ||
- propagate_mount_busy(&mnt->mnt, 1))
+ list_for_each_entry_safe(mnt, next, mounts, mnt_expire) {
+ if (!xchg(&mnt->mnt_expiry_mark, 1) ||
+ propagate_mount_busy(mnt, 1))
continue;
- list_move(&mnt->mnt.mnt_expire, &graveyard);
+ list_move(&mnt->mnt_expire, &graveyard);
}
while (!list_empty(&graveyard)) {
- mnt = list_first_entry(&graveyard, struct mount, mnt.mnt_expire);
- touch_mnt_namespace(mnt->mnt.mnt_ns);
+ mnt = list_first_entry(&graveyard, struct mount, mnt_expire);
+ touch_mnt_namespace(mnt->mnt_ns);
umount_tree(mnt, 1, &umounts);
}
br_write_unlock(vfsmount_lock);
int found = 0;
repeat:
- next = this_parent->mnt.mnt_mounts.next;
+ next = this_parent->mnt_mounts.next;
resume:
- while (next != &this_parent->mnt.mnt_mounts) {
+ while (next != &this_parent->mnt_mounts) {
struct list_head *tmp = next;
- struct mount *mnt = list_entry(tmp, struct mount, mnt.mnt_child);
+ struct mount *mnt = list_entry(tmp, struct mount, mnt_child);
next = tmp->next;
if (!(mnt->mnt.mnt_flags & MNT_SHRINKABLE))
/*
* Descend a level if the d_mounts list is non-empty.
*/
- if (!list_empty(&mnt->mnt.mnt_mounts)) {
+ if (!list_empty(&mnt->mnt_mounts)) {
this_parent = mnt;
goto repeat;
}
- if (!propagate_mount_busy(&mnt->mnt, 1)) {
- list_move_tail(&mnt->mnt.mnt_expire, graveyard);
+ if (!propagate_mount_busy(mnt, 1)) {
+ list_move_tail(&mnt->mnt_expire, graveyard);
found++;
}
}
* All done at this level ... ascend and resume the search
*/
if (this_parent != parent) {
- next = this_parent->mnt.mnt_child.next;
- this_parent = real_mount(this_parent->mnt.mnt_parent);
+ next = this_parent->mnt_child.next;
+ this_parent = this_parent->mnt_parent;
goto resume;
}
return found;
while (select_submounts(mnt, &graveyard)) {
while (!list_empty(&graveyard)) {
m = list_first_entry(&graveyard, struct mount,
- mnt.mnt_expire);
- touch_mnt_namespace(m->mnt.mnt_ns);
+ mnt_expire);
+ touch_mnt_namespace(m->mnt_ns);
umount_tree(m, 1, umounts);
}
}
void mnt_make_longterm(struct vfsmount *mnt)
{
- __mnt_make_longterm(mnt);
+ __mnt_make_longterm(real_mount(mnt));
}
-void mnt_make_shortterm(struct vfsmount *mnt)
+void mnt_make_shortterm(struct vfsmount *m)
{
#ifdef CONFIG_SMP
+ struct mount *mnt = real_mount(m);
if (atomic_add_unless(&mnt->mnt_longterm, -1, 1))
return;
br_write_lock(vfsmount_lock);
struct mnt_namespace *new_ns;
struct vfsmount *rootmnt = NULL, *pwdmnt = NULL;
struct mount *p, *q;
+ struct mount *old = mnt_ns->root;
struct mount *new;
new_ns = alloc_mnt_ns();
down_write(&namespace_sem);
/* First pass: copy the tree topology */
- new = copy_tree(real_mount(mnt_ns->root), mnt_ns->root->mnt_root,
- CL_COPY_ALL | CL_EXPIRE);
+ new = copy_tree(old, old->mnt.mnt_root, CL_COPY_ALL | CL_EXPIRE);
if (!new) {
up_write(&namespace_sem);
kfree(new_ns);
return ERR_PTR(-ENOMEM);
}
- new_ns->root = &new->mnt;
+ new_ns->root = new;
br_write_lock(vfsmount_lock);
- list_add_tail(&new_ns->list, &new_ns->root->mnt_list);
+ list_add_tail(&new_ns->list, &new->mnt_list);
br_write_unlock(vfsmount_lock);
/*
* as belonging to new namespace. We have already acquired a private
* fs_struct, so tsk->fs->lock is not needed.
*/
- p = real_mount(mnt_ns->root);
+ p = old;
q = new;
while (p) {
- q->mnt.mnt_ns = new_ns;
- __mnt_make_longterm(&q->mnt);
+ q->mnt_ns = new_ns;
+ __mnt_make_longterm(q);
if (fs) {
if (&p->mnt == fs->root.mnt) {
fs->root.mnt = mntget(&q->mnt);
- __mnt_make_longterm(&q->mnt);
+ __mnt_make_longterm(q);
mnt_make_shortterm(&p->mnt);
rootmnt = &p->mnt;
}
if (&p->mnt == fs->pwd.mnt) {
fs->pwd.mnt = mntget(&q->mnt);
- __mnt_make_longterm(&q->mnt);
+ __mnt_make_longterm(q);
mnt_make_shortterm(&p->mnt);
pwdmnt = &p->mnt;
}
}
- p = next_mnt(p, mnt_ns->root);
- q = next_mnt(q, new_ns->root);
+ p = next_mnt(p, old);
+ q = next_mnt(q, new);
}
up_write(&namespace_sem);
* create_mnt_ns - creates a private namespace and adds a root filesystem
* @mnt: pointer to the new root filesystem mountpoint
*/
-static struct mnt_namespace *create_mnt_ns(struct vfsmount *mnt)
+static struct mnt_namespace *create_mnt_ns(struct vfsmount *m)
{
- struct mnt_namespace *new_ns;
-
- new_ns = alloc_mnt_ns();
+ struct mnt_namespace *new_ns = alloc_mnt_ns();
if (!IS_ERR(new_ns)) {
+ struct mount *mnt = real_mount(m);
mnt->mnt_ns = new_ns;
__mnt_make_longterm(mnt);
new_ns->root = mnt;
- list_add(&new_ns->list, &new_ns->root->mnt_list);
+ list_add(&new_ns->list, &mnt->mnt_list);
} else {
- mntput(mnt);
+ mntput(m);
}
return new_ns;
}
*
* namespace_sem or vfsmount_lock is held
*/
-bool is_path_reachable(struct vfsmount *mnt, struct dentry *dentry,
+bool is_path_reachable(struct mount *mnt, struct dentry *dentry,
const struct path *root)
{
- while (mnt != root->mnt && mnt_has_parent(mnt)) {
+ while (&mnt->mnt != root->mnt && mnt_has_parent(mnt)) {
dentry = mnt->mnt_mountpoint;
mnt = mnt->mnt_parent;
}
- return mnt == root->mnt && is_subdir(dentry, root->dentry);
+ return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry);
}
int path_is_under(struct path *path1, struct path *path2)
{
int res;
br_read_lock(vfsmount_lock);
- res = is_path_reachable(path1->mnt, path1->dentry, path2);
+ res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);
br_read_unlock(vfsmount_lock);
return res;
}
error = -EINVAL;
new_mnt = real_mount(new.mnt);
root_mnt = real_mount(root.mnt);
- if (IS_MNT_SHARED(old.mnt) ||
- IS_MNT_SHARED(new.mnt->mnt_parent) ||
- IS_MNT_SHARED(root.mnt->mnt_parent))
+ if (IS_MNT_SHARED(real_mount(old.mnt)) ||
+ IS_MNT_SHARED(new_mnt->mnt_parent) ||
+ IS_MNT_SHARED(root_mnt->mnt_parent))
goto out4;
- if (!check_mnt(root.mnt) || !check_mnt(new.mnt))
+ if (!check_mnt(root_mnt) || !check_mnt(new_mnt))
goto out4;
error = -ENOENT;
if (d_unlinked(new.dentry))
error = -EINVAL;
if (root.mnt->mnt_root != root.dentry)
goto out4; /* not a mountpoint */
- if (!mnt_has_parent(root.mnt))
+ if (!mnt_has_parent(root_mnt))
goto out4; /* not attached */
if (new.mnt->mnt_root != new.dentry)
goto out4; /* not a mountpoint */
- if (!mnt_has_parent(new.mnt))
+ if (!mnt_has_parent(new_mnt))
goto out4; /* not attached */
/* make sure we can reach put_old from new_root */
- if (!is_path_reachable(old.mnt, old.dentry, &new))
+ if (!is_path_reachable(real_mount(old.mnt), old.dentry, &new))
goto out4;
br_write_lock(vfsmount_lock);
detach_mnt(new_mnt, &parent_path);
init_task.nsproxy->mnt_ns = ns;
get_mnt_ns(ns);
- root.mnt = ns->root;
- root.dentry = ns->root->mnt_root;
+ root.mnt = mnt;
+ root.dentry = mnt->mnt_root;
set_fs_pwd(current->fs, &root);
set_fs_root(current->fs, &root);
return;
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
- umount_tree(real_mount(ns->root), 0, &umount_list);
+ umount_tree(ns->root, 0, &umount_list);
br_write_unlock(vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
bool our_mnt(struct vfsmount *mnt)
{
- return check_mnt(mnt);
+ return check_mnt(real_mount(mnt));
}
projects / karo-tx-linux.git / blobdiff