Name
ioctl_fslabel - get or set a filesystem labelLibrary
Standard C library ( libc ", " -lc )Synopsis
"#include <linux/fs.h>" " /* Definition of " *FSLABEL* " constants */"#include <sys/ioctl.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
Possible errors 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.
Standards
Linux.History
Linux 4.18.They were previously known as BTRFS_IOC_GET_FSLABEL and BTRFS_IOC_SET_FSLABEL and were private to Btrfs.