mnt_flags fixes in do_remount()
* need vfsmount_lock over modifying it * need to preserve MNT_SHARED/MNT_UNBINDABLE Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -1536,8 +1536,12 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
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err = change_mount_flags(path->mnt, flags);
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err = change_mount_flags(path->mnt, flags);
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else
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else
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err = do_remount_sb(sb, flags, data, 0);
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err = do_remount_sb(sb, flags, data, 0);
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if (!err)
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if (!err) {
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spin_lock(&vfsmount_lock);
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mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;
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path->mnt->mnt_flags = mnt_flags;
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path->mnt->mnt_flags = mnt_flags;
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spin_unlock(&vfsmount_lock);
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}
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up_write(&sb->s_umount);
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up_write(&sb->s_umount);
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if (!err) {
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if (!err) {
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security_sb_post_remount(path->mnt, flags, data);
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security_sb_post_remount(path->mnt, flags, data);
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