man: create a separate xfs shutdown ioctl manpage
Create a separate manual page for the xfs shutdown ioctl so we can
document how it works.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
diff --git a/man/man2/ioctl_xfs_goingdown.2 b/man/man2/ioctl_xfs_goingdown.2
new file mode 100644
index 0000000..bedc85c
--- /dev/null
+++ b/man/man2/ioctl_xfs_goingdown.2
@@ -0,0 +1,63 @@
+.\" Copyright (c) 2019, Oracle. All rights reserved.
+.\"
+.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
+.\" SPDX-License-Identifier: GPL-2.0+
+.\" %%%LICENSE_END
+.TH IOCTL-XFS-GOINGDOWN 2 2019-06-17 "XFS"
+.SH NAME
+ioctl_xfs_goingdown \- shut down an XFS filesystem
+.SH SYNOPSIS
+.br
+.B #include <xfs/xfs_fs.h>
+.PP
+.BI "int ioctl(int " fd ", XFS_IOC_GOINGDOWN, uint32_t " flags );
+.SH DESCRIPTION
+Shuts down a live XFS filesystem.
+This is a software initiated hard shutdown and should be avoided whenever
+possible.
+After this call completes, the filesystem will be totally unusable and must be
+unmounted.
+
+.PP
+.I flags
+can be one of the following:
+.RS 0.4i
+.TP
+.B XFS_FSOP_GOING_FLAGS_DEFAULT
+Flush all dirty data and in-core state to disk, flush pending transactions to
+the log, and shut down.
+.TP
+.B XFS_FSOP_GOING_FLAGS_LOGFLUSH
+Flush all pending transactions to the log and shut down, leaving all dirty
+data unwritten.
+.TP
+.B XFS_FSOP_GOING_FLAGS_NOLOGFLUSH
+Shut down immediately, without writing pending transactions or dirty data
+to disk.
+
+.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.
+.TP
+.B EPERM
+Caller did not have permission to shut down the filesystem.
+.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 077dd41..7e6588b 100644
--- a/man/man3/xfsctl.3
+++ b/man/man3/xfsctl.3
@@ -365,6 +365,12 @@
for more information.
Save yourself a lot of frustration and avoid these ioctls.
+.TP
+.B XFS_IOC_GOINGDOWN
+See
+.BR ioctl_xfs_goingdown (2)
+for more information.
+
.PP
.nf
.B XFS_IOC_THAW
@@ -388,6 +394,7 @@
.BR ioctl_xfs_fscounts (2),
.BR ioctl_xfs_getresblks (2),
.BR ioctl_xfs_getbmap (2),
+.BR ioctl_xfs_goingdown (2),
.BR fstatfs (2),
.BR statfs (2),
.BR xfs (5),
