linux-kernel - [PATCH 2/2] f2fs-tools: fix to check free space before grow

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Message-Id: <20220614114929.6897-2-qixiaoyu1@xiaomi.com>
Date:   Tue, 14 Jun 2022 19:49:29 +0800
From:   qixiaoyu1 <qxy65535@...il.com>
To:     jaegeuk@...nel.org
Cc:     chao@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, qixiaoyu1 <qixiaoyu1@...omi.com>
Subject: [PATCH 2/2] f2fs-tools: fix to check free space before grow

Otherwise, after grow, kernel may report below error message
when we mount the image if -o parameter is specified during resize:

F2FS-fs (loop0): invalid crc_offset: 0
F2FS-fs (loop0): Wrong valid_user_blocks: 16404, user_block_count: 13312
F2FS-fs (loop0): Failed to get valid F2FS checkpoint
mount(2) system call failed: Structure needs cleaning.

Signed-off-by: qixiaoyu1 <qixiaoyu1@...omi.com>
---
 fsck/resize.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/fsck/resize.c b/fsck/resize.c
index d19c6fa..e135b66 100644
--- a/fsck/resize.c
+++ b/fsck/resize.c
@@ -599,6 +599,26 @@ static void rebuild_checkpoint(struct f2fs_sb_info *sbi,
 	DBG(0, "Info: Done to rebuild checkpoint blocks\n");
 }
 
+static int f2fs_resize_check(struct f2fs_sb_info *sbi, struct f2fs_super_block *new_sb)
+{
+	struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
+	block_t user_block_count;
+	unsigned int overprov_segment_count;
+
+	overprov_segment_count = (get_newsb(segment_count_main) -
+			c.new_reserved_segments) *
+			c.new_overprovision / 100;
+	overprov_segment_count += c.new_reserved_segments;
+
+	user_block_count = (get_newsb(segment_count_main) -
+			overprov_segment_count) * c.blks_per_seg;
+
+	if (get_cp(valid_block_count) > user_block_count)
+		return -1;
+
+	return 0;
+}
+
 static int f2fs_resize_grow(struct f2fs_sb_info *sbi)
 {
 	struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
@@ -616,6 +636,9 @@ static int f2fs_resize_grow(struct f2fs_sb_info *sbi)
 	if (get_new_sb(new_sb))
 		return -1;
 
+	if (f2fs_resize_check(sbi, new_sb) < 0)
+		return -1;
+
 	/* check nat availability */
 	if (get_sb(segment_count_nat) > get_newsb(segment_count_nat)) {
 		err = shrink_nats(sbi, new_sb);
@@ -659,11 +682,8 @@ static int f2fs_resize_shrink(struct f2fs_sb_info *sbi)
 	struct f2fs_super_block *sb = F2FS_RAW_SUPER(sbi);
 	struct f2fs_super_block new_sb_raw;
 	struct f2fs_super_block *new_sb = &new_sb_raw;
-	struct f2fs_checkpoint *cp = F2FS_CKPT(sbi);
 	block_t old_end_blkaddr, old_main_blkaddr;
 	block_t new_end_blkaddr, new_main_blkaddr, tmp_end_blkaddr;
-	block_t user_block_count;
-	unsigned int overprov_segment_count;
 	unsigned int offset;
 	int err = -1;
 
@@ -674,15 +694,7 @@ static int f2fs_resize_shrink(struct f2fs_sb_info *sbi)
 	if (get_new_sb(new_sb))
 		return -1;
 
-	overprov_segment_count = (get_newsb(segment_count_main) -
-			c.new_reserved_segments) *
-			c.new_overprovision / 100;
-	overprov_segment_count += c.new_reserved_segments;
-
-	user_block_count = (get_newsb(segment_count_main) -
-			overprov_segment_count) * c.blks_per_seg;
-
-	if (get_cp(valid_block_count) > user_block_count)
+	if (f2fs_resize_check(sbi, new_sb) < 0)
 		return -1;
 
 	/* check nat availability */
-- 
2.36.1