Commit 7a254053 authored by Hongbo Li's avatar Hongbo Li Committed by Kent Overstreet
Browse files

bcachefs: support FS_IOC_SETFSLABEL 



Implement support for FS_IOC_SETFSLABEL ioctl to set filesystem
label.

Signed-off-by: default avatarHongbo Li <lihongbo22@huawei.com>
Signed-off-by: default avatarKent Overstreet <kent.overstreet@linux.dev>
parent 81bce3cf

fs/bcachefs/fs-ioctl.c

+40 −0
Original line number Diff line number Diff line
@@ -301,6 +301,41 @@ static int bch2_ioc_getlabel(struct bch_fs *c, char __user *user_label) 
	return ret ? -EFAULT : 0;

}



static int bch2_ioc_setlabel(struct bch_fs *c,

			     struct file *file,

			     struct bch_inode_info *inode,

			     const char __user *user_label)

{

	int ret;

	char label[BCH_SB_LABEL_SIZE];



	if (!capable(CAP_SYS_ADMIN))

		return -EPERM;



	if (copy_from_user(label, user_label, sizeof(label)))

		return -EFAULT;



	if (strnlen(label, BCH_SB_LABEL_SIZE) == BCH_SB_LABEL_SIZE) {

		bch_err(c,

			"unable to set label with more than %d bytes",

			BCH_SB_LABEL_SIZE - 1);

		return -EINVAL;

	}



	ret = mnt_want_write_file(file);

	if (ret)

		return ret;



	mutex_lock(&c->sb_lock);

	strscpy(c->disk_sb.sb->label, label, BCH_SB_LABEL_SIZE);

	mutex_unlock(&c->sb_lock);



	ret = bch2_write_super(c);



	mnt_drop_write_file(file);

	return ret;

}



static int bch2_ioc_goingdown(struct bch_fs *c, u32 __user *arg)

{

	u32 flags;
@@ -539,6 +574,10 @@ long bch2_fs_file_ioctl(struct file *file, unsigned cmd, unsigned long arg) 
		ret = bch2_ioc_getlabel(c, (void __user *) arg);

		break;



	case FS_IOC_SETFSLABEL:

		ret = bch2_ioc_setlabel(c, file, inode, (const void __user *) arg);

		break;



	case FS_IOC_GOINGDOWN:

		ret = bch2_ioc_goingdown(c, (u32 __user *) arg);

		break;
@@ -584,6 +623,7 @@ long bch2_compat_fs_ioctl(struct file *file, unsigned cmd, unsigned long arg) 
		cmd = FS_IOC_GETVERSION;

		break;

	case FS_IOC_GETFSLABEL:

	case FS_IOC_SETFSLABEL:

		break;

	default:

		return -ENOIOCTLCMD;