2. System calls (functions provided by the kernel)
IOCTL_FSLABELSection: Linux Programmer's Manual (2)
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NAMEioctl_fslabel - get or set a filesystem label
int ioctl(int fd, FS_IOC_GETFSLABEL, char label[FSLABEL_MAX]);
int ioctl(int fd, FS_IOC_SETFSLABEL, char label[FSLABEL_MAX]);
DESCRIPTIONIf 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 VALUEOn success zero is returned. On error, -1 is returned, and errno is set to indicate the error.
ERRORSError can include (but are not limited to) the following:
- label references an inaccessible memory area.
- The specified label exceeds the maximum label length for the filesystem.
- This can appear if the filesystem does not support online label manipulation.
- The calling process does not have sufficient permissions to set the label.
VERSIONSThese 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 TOThis API is Linux-specific.
NOTESThe maximum string length for this interface is FSLABEL_MAX, including the terminating null byte ('\0'). Filesystems have differing maximum label lengths, which may or may not include the terminating null. The string provided to FS_IOC_SETFSLABEL must always be null-terminated, and the string returned by FS_IOC_GETFSLABEL will always be null-terminated.
SEE ALSOioctl(2), blkid(8)
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