ioctl_xfs_rtgroup_geometry - query XFS realtime group geometry information

NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO

NAME

ioctl_xfs_rtgroup_geometry − query XFS realtime group geometry information

SYNOPSIS

#include <xfs/xfs_fs.h>

int ioctl(int fd, XFS_IOC_RTGROUP_GEOMETRY, struct xfs_rtgroup_geometry *arg);

DESCRIPTION

This XFS ioctl retrieves the geometry information for a given realtime group. The geometry information is conveyed in a structure of the following form:

struct xfs_rtgroup_geometry {

		__u32 rg_number;
		__u32 rg_length;
		__u32 rg_sick;
		__u32 rg_checked;
		__u32 rg_flags;
		__u32 rg_reserved[27];

};

rg_number

The caller must set this field to the index of the realtime group that the caller wishes to learn about.

rg_length

The length of the realtime group is returned in this field, in units of filesystem blocks. rg_flags The caller can set this field to change the operational behavior of the ioctl. Currently no flags are defined, so this field must be zero.

rg_reserved and rg_pad

All reserved fields will be set to zero on return.

The fields rg_sick and rg_checked indicate the relative health of various realtime group metadata:

	•		If a given sick flag is set in rg_sick, then that piece of metadata has been observed to be damaged. The same bit will be set in rg_checked.
	•		If a given sick flag is set in rg_checked and is not set in rg_sick, then that piece of metadata has been checked and is not faulty.
	•		If a given sick flag is not set in rg_checked, then no conclusion can be made.

The following flags apply to these fields:

XFS_RTGROUP_GEOM_SICK_SUPER

Realtime group superblock.

XFS_RTGROUP_GEOM_SICK_BITMAP

Realtime bitmap for this group.

XFS_RTGROUP_GEOM_SICK_SUMMARY

Realtime summary for this group.

XFS_RTGROUP_GEOM_SICK_RTRMAPBT

Reverse mapping btree for this group.

RETURN VALUE

On error, −1 is returned, and errno is set to indicate the error.

ERRORS

Error codes can be one of, but are not limited to, the following:
EFSBADCRC

Metadata checksum validation failed while performing the query.

EFSCORRUPTED

Metadata corruption was encountered while performing the query.

	EINVAL		The specified realtime group number is not valid for this filesystem.
	EIO		An I/O error was encountered while performing the query.

CONFORMING TO

This API is specific to XFS filesystem on the Linux kernel.