From: Darrick J. Wong <djwong@kernel.org>
Date: Mon, 24 Feb 2025 18:21:59 +0000 (-0800)
Subject: xfs_db: add an rgresv command
X-Git-Tag: v6.14.0~78
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=66ae8591b1cd51bce7e9b0bcbe10d3fd8caf5fab;p=thirdparty%2Fxfsprogs-dev.git

xfs_db: add an rgresv command

Create a command to dump rtgroup btree space reservations.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/db/info.c b/db/info.c
index 9a86d247..ce6f3584 100644
--- a/db/info.c
+++ b/db/info.c
@@ -151,9 +151,128 @@ static const struct cmdinfo agresv_cmd = {
 	.help =		agresv_help,
 };
 
+static void
+rgresv_help(void)
+{
+	dbprintf(_(
+"\n"
+" Print the size and per-rtgroup reservation information for some realtime allocation groups.\n"
+"\n"
+" Specific realtime allocation group numbers can be provided as command line\n"
+" arguments.  If no arguments are provided, all allocation groups are iterated.\n"
+"\n"
+));
+
+}
+
+static void
+print_rgresv_info(
+	struct xfs_rtgroup	*rtg)
+{
+	struct xfs_trans	*tp;
+	xfs_filblks_t		ask = 0;
+	xfs_filblks_t		used = 0;
+	int			error;
+
+	error = -libxfs_trans_alloc_empty(mp, &tp);
+	if (error) {
+		dbprintf(
+ _("Cannot alloc transaction to look up rtgroup %u rmap inode\n"),
+				rtg_rgno(rtg));
+		return;
+	}
+
+	error = -libxfs_rtginode_load_parent(tp);
+	if (error) {
+		dbprintf(_("Cannot load realtime metadir, error %d\n"),
+			error);
+		goto out_trans;
+	}
+
+	/* rtrmapbt */
+	error = -libxfs_rtginode_load(rtg, XFS_RTGI_RMAP, tp);
+	if (error) {
+		dbprintf(_("Cannot load rtgroup %u rmap inode, error %d\n"),
+			rtg_rgno(rtg), error);
+		goto out_rele_dp;
+	}
+	if (rtg_rmap(rtg))
+		used += rtg_rmap(rtg)->i_nblocks;
+	libxfs_rtginode_irele(&rtg->rtg_inodes[XFS_RTGI_RMAP]);
+
+	ask += libxfs_rtrmapbt_calc_reserves(mp);
+
+	printf(_("rtg %d: dblocks: %llu fdblocks: %llu reserved: %llu used: %llu"),
+			rtg_rgno(rtg),
+			(unsigned long long)mp->m_sb.sb_dblocks,
+			(unsigned long long)mp->m_sb.sb_fdblocks,
+			(unsigned long long)ask,
+			(unsigned long long)used);
+	if (ask - used > mp->m_sb.sb_fdblocks)
+		printf(_(" <not enough space>"));
+	printf("\n");
+out_rele_dp:
+	libxfs_rtginode_irele(&mp->m_rtdirip);
+out_trans:
+	libxfs_trans_cancel(tp);
+}
+
+static int
+rgresv_f(
+	int			argc,
+	char			**argv)
+{
+	struct xfs_rtgroup	*rtg = NULL;
+	int			i;
+
+	if (argc > 1) {
+		for (i = 1; i < argc; i++) {
+			long	a;
+			char	*p;
+
+			errno = 0;
+			a = strtol(argv[i], &p, 0);
+			if (p == argv[i])
+				errno = ERANGE;
+			if (errno) {
+				perror(argv[i]);
+				continue;
+			}
+
+			if (a < 0 || a >= mp->m_sb.sb_rgcount) {
+				fprintf(stderr, "%ld: Not a rtgroup.\n", a);
+				continue;
+			}
+
+			rtg = libxfs_rtgroup_get(mp, a);
+			print_rgresv_info(rtg);
+			libxfs_rtgroup_put(rtg);
+		}
+		return 0;
+	}
+
+	while ((rtg = xfs_rtgroup_next(mp, rtg)))
+		print_rgresv_info(rtg);
+
+	return 0;
+}
+
+static const struct cmdinfo rgresv_cmd = {
+	.name =		"rgresv",
+	.altname =	NULL,
+	.cfunc =	rgresv_f,
+	.argmin =	0,
+	.argmax =	-1,
+	.canpush =	0,
+	.args =		NULL,
+	.oneline =	N_("print rtgroup reservation stats"),
+	.help =		rgresv_help,
+};
+
 void
 info_init(void)
 {
 	add_command(&info_cmd);
 	add_command(&agresv_cmd);
+	add_command(&rgresv_cmd);
 }
diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 3e521cd0..9beea4f7 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -311,7 +311,9 @@
 #define xfs_rtfree_extent		libxfs_rtfree_extent
 #define xfs_rtfree_blocks		libxfs_rtfree_blocks
 #define xfs_update_rtsb			libxfs_update_rtsb
+#define xfs_rtgroup_get			libxfs_rtgroup_get
 #define xfs_rtgroup_put			libxfs_rtgroup_put
+#define xfs_rtrmapbt_calc_reserves	libxfs_rtrmapbt_calc_reserves
 #define xfs_rtrmapbt_droot_maxrecs	libxfs_rtrmapbt_droot_maxrecs
 #define xfs_rtrmapbt_maxlevels_ondisk	libxfs_rtrmapbt_maxlevels_ondisk
 #define xfs_rtrmapbt_init_cursor	libxfs_rtrmapbt_init_cursor
diff --git a/man/man8/xfs_db.8 b/man/man8/xfs_db.8
index 83a8734d..784aa3cb 100644
--- a/man/man8/xfs_db.8
+++ b/man/man8/xfs_db.8
@@ -1131,6 +1131,11 @@ command.
 Exit
 .BR xfs_db .
 .TP
+.BI "rgresv [" rgno ]
+Displays the per-rtgroup reservation size, and per-rtgroup
+reservation usage for a given realtime allocation group.
+If no argument is given, display information for all rtgroups.
+.TP
 .BI "rtblock [" rtbno ]
 Set current address to the location on the realtime device given by
 .IR rtbno .