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FS_IOC_SETFSLABEL(2const) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

FS_IOC_SETFSLABEL(2const)FS_IOC_SETFSLABEL(2const)

NAME top

       FS_IOC_GETFSLABEL, FS_IOC_SETFSLABEL - get or set a filesystem       label

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <linux/fs.h>/* Definition of*FSLABEL*constants */#include <sys/ioctl.h>int ioctl(intfd, FS_IOC_GETFSLABEL, charlabel[FSLABEL_MAX]);int ioctl(intfd, FS_IOC_SETFSLABEL, charlabel[FSLABEL_MAX]);

DESCRIPTION top

       If a filesystem supports online label manipulation, theseioctl(2)       operations can be used to get or set the filesystem label for the       filesystem on whichfd resides.  TheFS_IOC_SETFSLABELoperation       requires privilege (CAP_SYS_ADMIN).

RETURN VALUE top

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

ERRORS top

       Possible errors include (but are not limited to) the following:EFAULTlabel references an inaccessible memory area.EINVALThe specified label exceeds the maximum label length for              the filesystem.ENOTTYThis can appear if the filesystem does not support online              label manipulation.EPERMThe calling process does not have sufficient permissions to              set the label.

STANDARDS top

       Linux.

HISTORY top

       Linux 4.18.       They were previously known asBTRFS_IOC_GET_FSLABELandBTRFS_IOC_SET_FSLABELand were private to Btrfs.

NOTES top

       The maximum string length for this interface isFSLABEL_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 toFS_IOC_SETFSLABELmust       always be null-terminated, and the string returned byFS_IOC_GETFSLABELwill always be null-terminated.

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17FS_IOC_SETFSLABEL(2const)

Pages that refer to this page:ioctl_fs(2)

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