linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: fix to avoid touching checkpointed data in get

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Message-ID: <c9b7ddbc-bba4-c024-4750-f2283a65bb18@huawei.com>
Date:   Tue, 13 Apr 2021 17:56:18 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: fix to avoid touching checkpointed
 data in get_victim()

On 2021/4/13 10:59, Jaegeuk Kim wrote:
> On 04/11, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> Could you please help to merge below cleanup diff into original patch?
>> or merge this separately if it is too late since it is near rc7.
> 
> I didn't review this tho, this gives an error in xfstests/083.
> 

 From 59c2bd34fb0c77bcede2af7e5d308c014c544a1e Mon Sep 17 00:00:00 2001
From: Chao Yu <yuchao0@...wei.com>
Date: Sun, 11 Apr 2021 14:29:34 +0800
Subject: [PATCH] f2fs: avoid duplicated codes for cleanup

f2fs_segment_has_free_slot() was copied and modified from
__next_free_blkoff(), they are almost the same, clean up to
reuse common code as much as possible.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
- fix to assign .next_blkoff in change_curseg()
  fs/f2fs/segment.c | 32 ++++++++++----------------------
  1 file changed, 10 insertions(+), 22 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index d6c6c13feb43..6e740ecf0814 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2638,22 +2638,20 @@ static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
  	curseg->alloc_type = LFS;
  }

-static void __next_free_blkoff(struct f2fs_sb_info *sbi,
-			struct curseg_info *seg, block_t start)
+static int __next_free_blkoff(struct f2fs_sb_info *sbi,
+					int segno, block_t start)
  {
-	struct seg_entry *se = get_seg_entry(sbi, seg->segno);
+	struct seg_entry *se = get_seg_entry(sbi, segno);
  	int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
  	unsigned long *target_map = SIT_I(sbi)->tmp_map;
  	unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
  	unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
-	int i, pos;
+	int i;

  	for (i = 0; i < entries; i++)
  		target_map[i] = ckpt_map[i] | cur_map[i];

-	pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
-
-	seg->next_blkoff = pos;
+	return __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
  }

  /*
@@ -2665,26 +2663,16 @@ static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
  				struct curseg_info *seg)
  {
  	if (seg->alloc_type == SSR)
-		__next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
+		seg->next_blkoff =
+			__next_free_blkoff(sbi, seg->segno,
+						seg->next_blkoff + 1);
  	else
  		seg->next_blkoff++;
  }

  bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno)
  {
-	struct seg_entry *se = get_seg_entry(sbi, segno);
-	int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
-	unsigned long *target_map = SIT_I(sbi)->tmp_map;
-	unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
-	unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
-	int i, pos;
-
-	for (i = 0; i < entries; i++)
-		target_map[i] = ckpt_map[i] | cur_map[i];
-
-	pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, 0);
-
-	return pos < sbi->blocks_per_seg;
+	return __next_free_blkoff(sbi, segno, 0) < sbi->blocks_per_seg;
  }

  /*
@@ -2712,7 +2700,7 @@ static void change_curseg(struct f2fs_sb_info *sbi, int type, bool flush)

  	reset_curseg(sbi, type, 1);
  	curseg->alloc_type = SSR;
-	__next_free_blkoff(sbi, curseg, 0);
+	curseg->next_blkoff = __next_free_blkoff(sbi, curseg->segno, 0);

  	sum_page = f2fs_get_sum_page(sbi, new_segno);
  	if (IS_ERR(sum_page)) {
-- 
2.29.2