[f2fs-dev] [PATCH] resize.f2fs: fix to check free space before shrink

[Chao Yu <yuchao0@huawei.com>]

Otherwise, after shrink, kernel will report below error message
when we mount the image:

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.

Reported-by: beroal <me@beroal.in.ua>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
 fsck/resize.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fsck/resize.c b/fsck/resize.c
index a083f68a809f..b043cd984dc6 100644
--- a/fsck/resize.c
+++ b/fsck/resize.c
@@ -650,8 +650,11 @@ 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;
 
@@ -662,6 +665,17 @@ 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)
+		return -1;
+
 	/* check nat availability */
 	if (get_sb(segment_count_nat) > get_newsb(segment_count_nat)) {
 		err = shrink_nats(sbi, new_sb);
-- 
2.29.2



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