KVM: unbreak userspace that does not sets tss address

[pandora-kernel.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index d1edf26..d751348 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -978,7 +978,13 @@ static int show_vfsmnt(struct seq_file *m, void *v)
        int err = 0;
        struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
 
-       mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
+       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, ' ');
@@ -1002,6 +1008,18 @@ const struct seq_operations mounts_op = {
        .show   = show_vfsmnt
 };
 
+static int uuid_is_nil(u8 *uuid)
+{
+       int i;
+       u8  *cp = (u8 *)uuid;
+
+       for (i = 0; i < 16; i++) {
+               if (*cp++)
+                       return 0;
+       }
+       return 1;
+}
+
 static int show_mountinfo(struct seq_file *m, void *v)
 {
        struct proc_mounts *p = m->private;
@@ -1013,7 +1031,12 @@ static int show_mountinfo(struct seq_file *m, void *v)
 
        seq_printf(m, "%i %i %u:%u ", mnt->mnt_id, mnt->mnt_parent->mnt_id,
                   MAJOR(sb->s_dev), MINOR(sb->s_dev));
-       seq_dentry(m, mnt->mnt_root, " \t\n\\");
+       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, ' ');
        seq_path_root(m, &mnt_path, &root, " \t\n\\");
        if (root.mnt != p->root.mnt || root.dentry != p->root.dentry) {
@@ -1040,11 +1063,20 @@ static int show_mountinfo(struct seq_file *m, void *v)
        if (IS_MNT_UNBINDABLE(mnt))
                seq_puts(m, " unbindable");
 
+       if (!uuid_is_nil(mnt->mnt_sb->s_uuid))
+               /* print the uuid */
+               seq_printf(m, " uuid:%pU", mnt->mnt_sb->s_uuid);
+
        /* Filesystem specific data */
        seq_puts(m, " - ");
        show_type(m, sb);
        seq_putc(m, ' ');
-       mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
+       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)
@@ -1070,11 +1102,15 @@ static int show_vfsstat(struct seq_file *m, void *v)
        int err = 0;
 
        /* device */
-       if (mnt->mnt_devname) {
-               seq_puts(m, "device ");
-               mangle(m, mnt->mnt_devname);
-       } else
-               seq_puts(m, "no device");
+       if (mnt->mnt_sb->s_op->show_devname) {
+               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 ");
@@ -1088,7 +1124,8 @@ static int show_vfsstat(struct seq_file *m, void *v)
        /* optional statistics */
        if (mnt->mnt_sb->s_op->show_stats) {
                seq_putc(m, ' ');
-               err = mnt->mnt_sb->s_op->show_stats(m, mnt);
+               if (!err)
+                       err = mnt->mnt_sb->s_op->show_stats(m, mnt);
        }
 
        seq_putc(m, '\n');
@@ -1767,6 +1804,10 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
        if (path->dentry != path->mnt->mnt_root)
                return -EINVAL;
 
+       err = security_sb_remount(sb, data);
+       if (err)
+               return err;
+
        down_write(&sb->s_umount);
        if (flags & MS_BIND)
                err = change_mount_flags(path->mnt, flags);