From 4893718570dac172f639cc5e8687e782c4f759ee Mon Sep 17 00:00:00 2001

From: "Darrick J. Wong" <darrick.wong@oracle.com>

Date: Fri, 20 Nov 2020 17:03:28 -0500

Subject: [PATCH] xfs_db: support printing time limits

Support printing the minimum and maxium timestamp limits on this

filesystem.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

Reviewed-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

---

diff --git a/db/Makefile b/db/Makefile

index 8fecfc1..68ab659 100644

--- a/db/Makefile

+++ b/db/Makefile

@@ -14,7 +14,7 @@ HFILES = addr.h agf.h agfl.h agi.h attr.h attrshort.h bit.h block.h bmap.h \

 	io.h logformat.h malloc.h metadump.h output.h print.h quit.h sb.h \

 	sig.h strvec.h text.h type.h write.h attrset.h symlink.h fsmap.h \

 	fuzz.h

-CFILES = $(HFILES:.h=.c) btdump.c info.c

+CFILES = $(HFILES:.h=.c) btdump.c info.c timelimit.c

 LSRCFILES = xfs_admin.sh xfs_ncheck.sh xfs_metadump.sh

 LLDLIBS	= $(LIBXFS) $(LIBXLOG) $(LIBFROG) $(LIBUUID) $(LIBRT) $(LIBPTHREAD)

diff --git a/db/command.c b/db/command.c

index c7c5234..73b06a7 100644

--- a/db/command.c

+++ b/db/command.c

@@ -139,4 +139,5 @@ init_commands(void)

 	write_init();

 	dquot_init();

 	fuzz_init();

+	timelimit_init();

 }

diff --git a/db/command.h b/db/command.h

index eacfd46..1a9b4d2 100644

--- a/db/command.h

+++ b/db/command.h

@@ -30,3 +30,4 @@ extern void		init_commands(void);

 extern void		btdump_init(void);

 extern void		info_init(void);

+extern void		timelimit_init(void);

diff --git a/db/timelimit.c b/db/timelimit.c

new file mode 100644

index 0000000..53a0a39

--- /dev/null

+++ b/db/timelimit.c

@@ -0,0 +1,160 @@

+// SPDX-License-Identifier: GPL-2.0-or-later

+/*

+ * Copyright (C) 2020 Oracle.  All Rights Reserved.

+ * Author: Darrick J. Wong <darrick.wong@oracle.com>

+ */

+#include "libxfs.h"

+#include "command.h"

+#include "output.h"

+#include "init.h"

+

+enum show_what {

+	SHOW_AUTO,

+	SHOW_CLASSIC,

+	SHOW_BIGTIME,

+};

+

+

+enum print_how {

+	PRINT_RAW,

+	PRINT_PRETTY,

+	PRINT_COMPACT,

+};

+

+static void

+show_limit(

+	const char	*tag,

+	int64_t		limit,

+	enum print_how	how)

+{

+	if (how == PRINT_COMPACT) {

+		dbprintf("%" PRId64 " ", limit);

+		return;

+	}

+

+	if (how == PRINT_PRETTY && limit <= LONG_MAX && limit >= LONG_MIN) {

+		time_t	tt = limit;

+		char	*c;

+

+		c = ctime(&tt;;

+		if (c) {

+			dbprintf("%s = %24.24s\n", tag, c);

+			return;

+		}

+	}

+

+	dbprintf("%s = %" PRId64 "\n", tag, limit);

+}

+

+static void

+show_limits(

+	enum show_what	whatkind,

+	enum print_how	how)

+{

+	enum print_how	grace_how = how;

+

+	switch (whatkind) {

+	case SHOW_AUTO:

+		/* should never get here */

+		break;

+	case SHOW_CLASSIC:

+		show_limit("time.min", XFS_LEGACY_TIME_MIN, how);

+		show_limit("time.max", XFS_LEGACY_TIME_MAX, how);

+		show_limit("dqtimer.min", XFS_DQ_LEGACY_EXPIRY_MIN, how);

+		show_limit("dqtimer.max", XFS_DQ_LEGACY_EXPIRY_MAX, how);

+		break;

+	case SHOW_BIGTIME:

+		show_limit("time.min",

+				xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MIN), how);

+		show_limit("time.max",

+				xfs_bigtime_to_unix(XFS_BIGTIME_TIME_MAX), how);

+		show_limit("dqtimer.min",

+				xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MIN),

+				how);

+		show_limit("dqtimer.max",

+				xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MAX),

+				how);

+		break;

+	}

+

+	/* grace periods are always integers */

+	if (grace_how != PRINT_COMPACT)

+		grace_how = PRINT_RAW;

+	show_limit("dqgrace.min", XFS_DQ_GRACE_MIN, grace_how);

+	show_limit("dqgrace.min", XFS_DQ_GRACE_MAX, grace_how);

+

+	if (how == PRINT_COMPACT)

+		dbprintf("\n");

+}

+

+static int

+timelimit_f(

+	int		argc,

+	char		**argv)

+{

+	enum show_what	whatkind = SHOW_AUTO;

+	enum print_how	how = PRINT_RAW;

+	int		i;

+

+	for (i = 1; i < argc; i++) {

+		if (!strcmp("--classic", argv[i]))

+			whatkind = SHOW_CLASSIC;

+		else if (!strcmp("--bigtime", argv[i]))

+			whatkind = SHOW_BIGTIME;

+		else if (!strcmp("--pretty", argv[i]))

+			how = PRINT_PRETTY;

+		else if (!strcmp("--compact", argv[i]))

+			how = PRINT_COMPACT;

+		else {

+			dbprintf(_("%s: bad option for timelimit command\n"),

+					argv[i]);

+			return 1;

+		}

+	}

+

+	if (whatkind == SHOW_AUTO) {

+		if (xfs_sb_version_hasbigtime(&mp->m_sb))

+			whatkind = SHOW_BIGTIME;

+		else

+			whatkind = SHOW_CLASSIC;

+	}

+

+	show_limits(whatkind, how);

+	return 0;

+}

+

+static void

+timelimit_help(void)

+{

+	dbprintf(_(

+"\n"

+" Print the minimum and maximum supported values for inode timestamps,\n"

+" disk quota expiration timers, and disk quota grace periods supported\n"

+" by this filesystem.\n"

+"\n"

+" Options:\n"

+"   --classic -- Force printing of the classic time limits.\n"

+"   --bigtime -- Force printing of the bigtime limits.\n"

+"   --pretty  -- Pretty-print the time limits.\n"

+"   --compact -- Print the limits in a single line.\n"

+"\n"

+));

+

+}

+

+static const cmdinfo_t	timelimit_cmd = {

+	.name		= "timelimit",

+	.cfunc		= timelimit_f,

+	.argmin		= 0,

+	.argmax		= -1,

+	.canpush	= 0,

+	.args		= N_("[--classic|--bigtime] [--pretty]"),

+	.oneline	= N_("display timestamp limits"),

+	.help		= timelimit_help,

+};

+

+void

+timelimit_init(void)

+{

+	add_command(&timelimit_cmd);

+}

diff --git a/man/man8/xfs_db.8 b/man/man8/xfs_db.8

index a1ee351..f46e936 100644

--- a/man/man8/xfs_db.8

+++ b/man/man8/xfs_db.8

@@ -785,6 +785,29 @@ The possible data types are:

 .BR rtsummary ", " sb ", " symlink " and " text .

 See the TYPES section below for more information on these data types.

 .TP

+.BI "timelimit [" OPTIONS ]

+Print the minimum and maximum supported values for inode timestamps,

+quota expiration timers, and quota grace periods supported by this

+filesystem.

+Options include:

+.RS 1.0i

+.TP 0.4i

+.B \--bigtime

+Print the time limits of an XFS filesystem with the

+.B bigtime

+feature enabled.

+.TP 0.4i

+.B \--classic

+Print the time limits of a classic XFS filesystem.

+.TP 0.4i

+.B \--compact

+Print all limits as raw values on a single line.

+.TP 0.4i

+.B \--pretty

+Print the timestamps in the current locale's date and time format instead of

+raw seconds since the Unix epoch.

+.RE

+.TP

 .BI "uuid [" uuid " | " generate " | " rewrite " | " restore ]

 Set the filesystem universally unique identifier (UUID).

 The filesystem UUID can be used by