[36/45] xfs_io: add a command to display allocation group information

Commit Message

Darrick J. Wong Dec. 30, 2022, 10:19 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Add a new 'aginfo' command to xfs_io so that we can display allocation
group geometry.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 io/Makefile       |    2 -
 io/aginfo.c       |  119 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 io/init.c         |    1 
 io/io.h           |    1 
 man/man8/xfs_io.8 |   12 +++++
 5 files changed, 133 insertions(+), 2 deletions(-)
 create mode 100644 io/aginfo.c

Patch

diff --git a/io/Makefile b/io/Makefile
index aa0d216b25f..2b7748bfc13 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -8,7 +8,7 @@  include $(TOPDIR)/include/builddefs
 LTCOMMAND = xfs_io
 LSRCFILES = xfs_bmap.sh xfs_freeze.sh xfs_mkfile.sh
 HFILES = init.h io.h
-CFILES = init.c \
+CFILES = init.c aginfo.c \
 	attr.c bmap.c bulkstat.c crc32cselftest.c cowextsize.c encrypt.c \
 	file.c freeze.c fsync.c getrusage.c imap.c inject.c label.c link.c \
 	mmap.c open.c parent.c pread.c prealloc.c pwrite.c reflink.c \
diff --git a/io/aginfo.c b/io/aginfo.c
new file mode 100644
index 00000000000..06e1cb7ba88
--- /dev/null
+++ b/io/aginfo.c
@@ -0,0 +1,119 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2022 Oracle.
+ * All Rights Reserved.
+ */
+#include "platform_defs.h"
+#include "libxfs.h"
+#include "command.h"
+#include "input.h"
+#include "init.h"
+#include "io.h"
+#include "libfrog/logging.h"
+#include "libfrog/paths.h"
+#include "libfrog/fsgeom.h"
+
+static cmdinfo_t aginfo_cmd;
+
+static int
+report_aginfo(
+	struct xfs_fd		*xfd,
+	xfs_agnumber_t		agno)
+{
+	struct xfs_ag_geometry	ageo = { 0 };
+	int			ret;
+
+	ret = -xfrog_ag_geometry(xfd->fd, agno, &ageo);
+	if (ret) {
+		xfrog_perror(ret, "aginfo");
+		return 1;
+	}
+
+	printf(_("AG: %u\n"),		ageo.ag_number);
+	printf(_("Blocks: %u\n"),	ageo.ag_length);
+	printf(_("Free Blocks: %u\n"),	ageo.ag_freeblks);
+	printf(_("Inodes: %u\n"),	ageo.ag_icount);
+	printf(_("Free Inodes: %u\n"),	ageo.ag_ifree);
+	printf(_("Sick: 0x%x\n"),	ageo.ag_sick);
+	printf(_("Checked: 0x%x\n"),	ageo.ag_checked);
+	printf(_("Flags: 0x%x\n"),	ageo.ag_flags);
+
+	return 0;
+}
+
+/* Display AG status. */
+static int
+aginfo_f(
+	int			argc,
+	char			**argv)
+{
+	struct xfs_fd		xfd = XFS_FD_INIT(file->fd);
+	unsigned long long	x;
+	xfs_agnumber_t		agno = NULLAGNUMBER;
+	int			c;
+	int			ret = 0;
+
+	ret = -xfd_prepare_geometry(&xfd);
+	if (ret) {
+		xfrog_perror(ret, "xfd_prepare_geometry");
+		exitcode = 1;
+		return 1;
+	}
+
+	while ((c = getopt(argc, argv, "a:")) != EOF) {
+		switch (c) {
+		case 'a':
+			errno = 0;
+			x = strtoll(optarg, NULL, 10);
+			if (!errno && x >= NULLAGNUMBER)
+				errno = ERANGE;
+			if (errno) {
+				perror("aginfo");
+				return 1;
+			}
+			agno = x;
+			break;
+		default:
+			return command_usage(&aginfo_cmd);
+		}
+	}
+
+	if (agno != NULLAGNUMBER) {
+		ret = report_aginfo(&xfd, agno);
+	} else {
+		for (agno = 0; !ret && agno < xfd.fsgeom.agcount; agno++) {
+			ret = report_aginfo(&xfd, agno);
+		}
+	}
+
+	return ret;
+}
+
+static void
+aginfo_help(void)
+{
+	printf(_(
+"\n"
+"Report allocation group geometry.\n"
+"\n"
+" -a agno  -- Report on the given allocation group.\n"
+"\n"));
+
+}
+
+static cmdinfo_t aginfo_cmd = {
+	.name = "aginfo",
+	.cfunc = aginfo_f,
+	.argmin = 0,
+	.argmax = -1,
+	.args = "[-a agno]",
+	.flags = CMD_NOMAP_OK,
+	.help = aginfo_help,
+};
+
+void
+aginfo_init(void)
+{
+	aginfo_cmd.oneline = _("Get XFS allocation group state.");
+	add_command(&aginfo_cmd);
+}
diff --git a/io/init.c b/io/init.c
index 96536a25a1f..78d7d04e7a6 100644
--- a/io/init.c
+++ b/io/init.c
@@ -44,6 +44,7 @@  init_cvtnum(
 static void
 init_commands(void)
 {
+	aginfo_init();
 	atomicupdate_init();
 	attr_init();
 	bmap_init();
diff --git a/io/io.h b/io/io.h
index 1cfe8edc2db..77bedf5159d 100644
--- a/io/io.h
+++ b/io/io.h
@@ -189,3 +189,4 @@  extern void		repair_init(void);
 extern void		crc32cselftest_init(void);
 extern void		bulkstat_init(void);
 extern void		atomicupdate_init(void);
+extern void		aginfo_init(void);
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 0c0b00b5712..95c63f32a2a 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -1545,7 +1545,17 @@  This option is not compatible with the
 flag.
 .RE
 .PD
-
+.TP
+.BI "aginfo [ \-a " agno " ]"
+Show information about or update the state of allocation groups.
+.RE
+.RS 1.0i
+.PD 0
+.TP
+.BI \-a
+Act only on a specific allocation group.
+.PD
+.RE
 
 .SH OTHER COMMANDS
 .TP