FS_IOC_SETFSLABEL(2const) - Linux manual page (original) (raw)

FSIOCSETFSLABEL(2const) FSIOCSETFSLABEL(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(int** _fd_**, FS_IOC_GETFSLABEL, char** _label_**[FSLABEL_MAX]);**
   **int ioctl(int** _fd_**, FS_IOC_SETFSLABEL, char** _label_**[FSLABEL_MAX]);**

DESCRIPTION top

   If a filesystem supports online label manipulation, these [ioctl(2)](../man2/ioctl.2.html)
   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 top

   On success zero is returned.  On error, -1 is returned, and _[errno](../man3/errno.3.html)_
   is set to indicate the error.

ERRORS top

   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 top

   Linux.

HISTORY top

   Linux 4.18.

   They were previously known as **BTRFS_IOC_GET_FSLABEL** and
   **BTRFS_IOC_SET_FSLABEL** and were private to Btrfs.

NOTES top

   The 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 ALSO top

   [ioctl(2)](../man2/ioctl.2.html), [blkid(8)](../man8/blkid.8.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 FSIOCSETFSLABEL(2const)

Pages that refer to this page:ioctl_fs(2)