ioctl_fslabel(2)

NAME

ioctl_fslabel – get or set a filesystem label

SYNOPSIS

#include <sys/ioctl.h>
#include <linux/fs.h>

int ioctl(int fd, FS_IOC_GETFSLABEL, char label[FSLABEL_MAX]);
int ioctl(int fd, FS_IOC_SETFSLABEL, char label[FSLABEL_MAX]);

DESCRIPTION

If a filesystem supports online label manipulation, these ioctl(2) operations can be used to get or set the filesystem label for the filesystem on which fd resides. The FS_IOC_SETFSLABEL operation requires privilege (CAP_SYS_ADMIN).

RETURN VALUE

On success zero is returned. On error, -1 is returned, and errno is set to indicate the error.

ERRORS

Error can include (but are not limited to) the following:

EFAULT

label references an inaccessible memory area.

EINVAL

The specified label exceeds the maximum label length for the filesystem.

ENOTTY

This can appear if the filesystem does not support online label manipulation.

EPERM

The calling process does not have sufficient permissions to set the label.

VERSIONS

These ioctl(2) operations first appeared in Linux 4.18. They were previously known as BTRFS_IOC_GET_FSLABEL and BTRFS_IOC_SET_FSLABEL and were private to Btrfs.

CONFORMING TO

This API is Linux-specific.

NOTES

The maximum string length for this interface is FSLABEL_MAX, including the terminating null byte (‘