linux-kernel - [PATCH] resize.f2fs: add option to manually specify new overprovision

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Date:   Fri, 23 Jul 2021 11:46:22 +0800
From:   Chao Liu <chaoliu719@...il.com>
To:     chao@...nel.org, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH] resize.f2fs: add option to manually specify new overprovision

Make.f2fs supports manually specifying overprovision, and we expect
resize.f2fs to support it as well.

This change add a new '-o' option to manually specify overprovision.

Signed-off-by: Chao Liu <liuchao12@...omi.com>
---
 fsck/main.c   | 8 ++++++--
 fsck/resize.c | 9 ++++++++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/fsck/main.c b/fsck/main.c
index 260ff29..06253e2 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -124,7 +124,8 @@ void resize_usage()
 	MSG(0, "[options]:\n");
 	MSG(0, "  -d debug level [default:0]\n");
 	MSG(0, "  -i extended node bitmap, node ratio is 20%% by default\n");
-	MSG(0, "  -s safe resize (Does not resize metadata)");
+	MSG(0, "  -o overprovision percentage [default:auto]\n");
+	MSG(0, "  -s safe resize (Does not resize metadata)\n");
 	MSG(0, "  -t target sectors [default: device size]\n");
 	MSG(0, "  -V print the version number and exit\n");
 	exit(1);
@@ -529,7 +530,7 @@ void f2fs_parse_options(int argc, char *argv[])
 #endif
 	} else if (!strcmp("resize.f2fs", prog)) {
 #ifdef WITH_RESIZE
-		const char *option_string = "d:fst:iV";
+		const char *option_string = "d:fst:io:V";
 
 		c.func = RESIZE;
 		while ((option = getopt(argc, argv, option_string)) != EOF) {
@@ -563,6 +564,9 @@ void f2fs_parse_options(int argc, char *argv[])
 			case 'i':
 				c.large_nat_bitmap = 1;
 				break;
+			case 'o':
+				c.new_overprovision = atof(optarg);
+				break;
 			case 'V':
 				show_version(prog);
 				exit(0);
diff --git a/fsck/resize.c b/fsck/resize.c
index 78d578e..85a53c5 100644
--- a/fsck/resize.c
+++ b/fsck/resize.c
@@ -146,7 +146,9 @@ safe_resize:
 						get_sb(segs_per_sec));
 
 	/* Let's determine the best reserved and overprovisioned space */
-	c.new_overprovision = get_best_overprovision(sb);
+	if (c.new_overprovision == 0)
+		c.new_overprovision = get_best_overprovision(sb);
+
 	c.new_reserved_segments =
 		(2 * (100 / c.new_overprovision + 1) + 6) *
 						get_sb(segs_per_sec);
@@ -476,6 +478,11 @@ static void rebuild_checkpoint(struct f2fs_sb_info *sbi,
 	set_cp(overprov_segment_count, get_cp(overprov_segment_count) +
 						get_cp(rsvd_segment_count));
 
+	MSG(0, "Info: Overprovision ratio = %.3lf%%\n", c.new_overprovision);
+	MSG(0, "Info: Overprovision segments = %u (GC reserved = %u)\n",
+					get_cp(overprov_segment_count),
+					c.new_reserved_segments);
+
 	free_segment_count = get_free_segments(sbi);
 	new_segment_count = get_newsb(segment_count_main) -
 					get_sb(segment_count_main);
-- 
2.32.0