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[6/8] libxfs: break out FSCOUNTS manpage

Message ID 155839432577.68923.82903957299262051.stgit@magnolia (mailing list archive)
State Superseded
Headers show
Series xfsprogs: document the ioctls scrub uses | expand

Commit Message

Darrick J. Wong May 20, 2019, 11:18 p.m. UTC 
From: Darrick J. Wong <darrick.wong@oracle.com>

Create a separate manual page for the FSCOUNTS ioctl so we can document
how it works.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 man/man2/ioctl_xfs_fscounts.2 |   67 +++++++++++++++++++++++++++++++++++++++++
 man/man3/xfsctl.3             |   13 ++++----
 2 files changed, 74 insertions(+), 6 deletions(-)
 create mode 100644 man/man2/ioctl_xfs_fscounts.2
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Patch

diff --git a/man/man2/ioctl_xfs_fscounts.2 b/man/man2/ioctl_xfs_fscounts.2
new file mode 100644
index 00000000..44b214a1
--- /dev/null
+++ b/man/man2/ioctl_xfs_fscounts.2
@@ -0,0 +1,67 @@ 
+.\" Copyright (c) 2019, Oracle.  All rights reserved.
+.\"
+.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
+.\" SPDX-License-Identifier: GPL-2.0+
+.\" %%%LICENSE_END
+.TH IOCTL-XFS-FSCOUNTS 2 2019-04-16 "XFS"
+.SH NAME
+ioctl_xfs_fscounts \- query XFS summary counter information
+.SH SYNOPSIS
+.br
+.B #include <xfs/xfs_fs.h>
+.PP
+.BI "int ioctl(int " fd ", XFS_IOC_FSCOUNTS, struct xfs_fsop_counts *" arg );
+.SH DESCRIPTION
+Query the raw filesystem summary counters.
+Unlike
+.BR statvfs (3),
+the values returned here are the raw values, which do not reflect any
+alterations or limits set by quotas.
+The counter information is conveyed in a structure of the following form:
+.PP
+.in +4n
+.nf
+struct xfs_fscounts {
+	__u64   freedata;
+	__u64   freertx;
+	__u64   freeino;
+	__u64   allocino;
+};
+.fi
+.in
+.PP
+.I freedata
+is the number of free filesystem blocks on the data device.
+.PP
+.I freertx
+is the number of free xtents on the realtime device.
+.PP
+.I freeino
+is the number of inode records that are not in use within the space that has
+been allocated for them.
+.PP
+.I allocino
+is the number of inode records for which space has been allocated.
+.SH RETURN VALUE
+On error, \-1 is returned, and
+.I errno
+is set to indicate the error.
+.PP
+.SH ERRORS
+Error codes can be one of, but are not limited to, the following:
+.TP
+.B EFSBADCRC
+Metadata checksum validation failed while performing the query.
+.TP
+.B EFSCORRUPTED
+Metadata corruption was encountered while performing the query.
+.TP
+.B EINVAL
+The specified allocation group number is not valid for this filesystem.
+.TP
+.B EIO
+An I/O error was encountered while performing the query.
+.SH CONFORMING TO
+This API is specific to XFS filesystem on the Linux kernel.
+.SH SEE ALSO
+.BR ioctl (2)
diff --git a/man/man3/xfsctl.3 b/man/man3/xfsctl.3
index dab4243d..9b8b52f4 100644
--- a/man/man3/xfsctl.3
+++ b/man/man3/xfsctl.3
@@ -390,6 +390,12 @@  See
 .BR ioctl_xfs_scrub_metadata (2)
 for more information.
 
+.TP
+.B XFS_IOC_FSCOUNTS
+See
+.BR ioctl_xfs_fscounts (2)
+for more information.
+
 .PP
 .nf
 .B XFS_IOC_THAW
@@ -398,16 +404,11 @@  for more information.
 .B XFS_IOC_SET_RESBLKS
 .B XFS_IOC_FSGROWFSDATA
 .B XFS_IOC_FSGROWFSLOG
-.B XFS_IOC_FSGROWFSRT
 .fi
 .TP
-.B XFS_IOC_FSCOUNTS
+.B XFS_IOC_FSGROWFSRT
 These interfaces are used to implement various filesystem internal
 operations on XFS filesystems.
-For
-.B XFS_FS_COUNTS
-(get filesystem dynamic global information), the output structure is of type
-.BR xfs_fsop_counts_t .
 The remainder of these operations will not be described further
 as they are not of general use to applications.