*/
#include <linux/config.h>
+#include <linux/syscalls.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/mount.h>
-#include <linux/vs_base.h>
#include <linux/vserver/namespace.h>
+#include <linux/vserver/xid.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#endif
/* spinlock for vfsmount related operations, inplace of dcache_lock */
-spinlock_t vfsmount_lock __cacheline_aligned_in_smp = SPIN_LOCK_UNLOCKED;
+ __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock);
static struct list_head *mount_hashtable;
static int hash_mask, hash_bits;
return found;
}
-EXPORT_SYMBOL(lookup_mnt);
-
static inline int check_mnt(struct vfsmount *mnt)
{
return mnt->mnt_namespace == current->namespace;
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;
mnt->mnt_namespace = old->mnt_namespace;
+ mnt->mnt_xid = old->mnt_xid;
/* stick the duplicate mount on the same expiry list
* as the original if that was on one */
seq_escape(m, s, " \t\n\\");
}
+static int mnt_is_reachable(struct vfsmount *mnt)
+{
+ struct vfsmount *root_mnt;
+ struct dentry *root, *point;
+ int ret;
+
+ if (!mnt)
+ return 1;
+ if (mnt == mnt->mnt_namespace->root)
+ return 1;
+
+ spin_lock(&dcache_lock);
+ root_mnt = current->fs->rootmnt;
+ root = current->fs->root;
+ point = root;
+
+ while ((mnt != mnt->mnt_parent) && (mnt != root_mnt)) {
+ point = mnt->mnt_mountpoint;
+ mnt = mnt->mnt_parent;
+ }
+
+ ret = (mnt == root_mnt) && is_subdir(point, root);
+
+ spin_unlock(&dcache_lock);
+
+ return ret;
+}
+
static int show_vfsmnt(struct seq_file *m, void *v)
{
struct vfsmount *mnt = v;
if (vx_flags(VXF_HIDE_MOUNT, 0))
return 0;
- if (!vx_check_vfsmount(current->vx_info, mnt))
+ if (!mnt_is_reachable(mnt))
return 0;
- mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
- seq_putc(m, ' ');
- seq_path(m, mnt, mnt->mnt_root, " \t\n\\");
- seq_putc(m, ' ');
+ if (!vx_check(0, VX_ADMIN|VX_WATCH) &&
+ mnt == current->fs->rootmnt) {
+ seq_puts(m, "/dev/root / ");
+ } else {
+ mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
+ seq_putc(m, ' ');
+ seq_path(m, mnt, mnt->mnt_root, " \t\n\\");
+ seq_putc(m, ' ');
+ }
mangle(m, mnt->mnt_sb->s_type->name);
seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? " ro" : " rw");
for (fs_infop = fs_info; fs_infop->flag; fs_infop++) {
if (mnt->mnt_flags & fs_infop->flag)
seq_puts(m, fs_infop->str);
}
+ if (mnt->mnt_flags & MNT_XID)
+ seq_printf(m, ",xid=%d", mnt->mnt_xid);
if (mnt->mnt_sb->s_op->show_options)
err = mnt->mnt_sb->s_op->show_options(m, mnt);
seq_puts(m, " 0 0\n");
EXPORT_SYMBOL(may_umount);
-static inline void __umount_tree(struct vfsmount *mnt, struct list_head *kill)
+static inline void __umount_list(struct list_head *kill)
{
+ struct vfsmount *mnt;
+
while (!list_empty(kill)) {
mnt = list_entry(kill->next, struct vfsmount, mnt_list);
list_del_init(&mnt->mnt_list);
list_del(&p->mnt_list);
list_add(&p->mnt_list, &kill);
}
- __umount_tree(mnt, &kill);
+ __umount_list(&kill);
}
void umount_unused(struct vfsmount *mnt, struct fs_struct *fs)
list_del(&p->mnt_list);
list_add(&p->mnt_list, &kill);
}
- __umount_tree(mnt, &kill);
+ __umount_list(&kill);
}
static int do_umount(struct vfsmount *mnt, int flags)
down_write(&sb->s_umount);
if (!(sb->s_flags & MS_RDONLY)) {
lock_kernel();
+ DQUOT_OFF(sb);
retval = do_remount_sb(sb, MS_RDONLY, NULL, 0);
unlock_kernel();
}
/*
* do loopback mount.
*/
-static int do_loopback(struct nameidata *nd, char *old_name, int recurse)
+static int do_loopback(struct nameidata *nd, char *old_name, xid_t xid, int flags)
{
struct nameidata old_nd;
struct vfsmount *mnt = NULL;
int err = mount_is_safe(nd);
+ int recurse = flags & MS_REC;
if (err)
return err;
if (!old_name || !*old_name)
list_del_init(&mnt->mnt_fslink);
spin_unlock(&vfsmount_lock);
+ if (flags & MS_XID) {
+ mnt->mnt_xid = xid;
+ mnt->mnt_flags |= MNT_XID;
+ }
err = graft_tree(mnt, nd);
if (err) {
spin_lock(&vfsmount_lock);
*/
static int do_remount(struct nameidata *nd, int flags, int mnt_flags,
- void *data)
+ void *data, xid_t xid)
{
int err;
struct super_block * sb = nd->mnt->mnt_sb;
mnt_flags |= MNT_NODEV;
down_write(&sb->s_umount);
err = do_remount_sb(sb, flags, data, 0);
- if (!err)
+ if (!err) {
nd->mnt->mnt_flags=mnt_flags;
+ if (flags & MS_XID)
+ nd->mnt->mnt_xid = xid;
+ }
up_write(&sb->s_umount);
if (!err)
security_sb_post_remount(nd->mnt, flags, data);
struct nameidata nd;
int retval = 0;
int mnt_flags = 0;
+ xid_t xid = 0;
/* Discard magic */
if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
if (data_page)
((char *)data_page)[PAGE_SIZE - 1] = 0;
+ retval = vx_parse_xid(data_page, &xid, 1);
+ if (retval) {
+ mnt_flags |= MNT_XID;
+ /* bind and re-mounts get xid flag */
+ if (flags & (MS_BIND|MS_REMOUNT))
+ flags |= MS_XID;
+ }
+
/* Separate the per-mountpoint flags */
if (flags & MS_NOSUID)
mnt_flags |= MNT_NOSUID;
if (flags & MS_REMOUNT)
retval = do_remount(&nd, flags & ~MS_REMOUNT, mnt_flags,
- data_page);
+ data_page, xid);
else if (flags & MS_BIND)
- retval = do_loopback(&nd, dev_name, flags & MS_REC);
+ retval = do_loopback(&nd, dev_name, xid, flags);
else if (flags & MS_MOVE)
retval = do_move_mount(&nd, dev_name);
else
}
}
-EXPORT_SYMBOL(set_fs_root);
-
/*
* Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values.
* It can block. Requires the big lock held.
}
}
-EXPORT_SYMBOL(set_fs_pwd);
-
static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
{
struct task_struct *g, *p;
git://git.onelab.eu / linux-2.6.git / blobdiff