Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@kernel.org>, stable@vger.kernel.org,
        Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Subject: [PATCH] Revert "f2fs: clean up w/ sbi->log_sectors_per_block"
Date:   Mon,  7 Aug 2023 12:52:19 -0700
Message-ID: <20230807195219.371131-1-jaegeuk@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

This reverts commit bfd476623999118d9c509cb0fa9380f2912bc225.

Shinichiro Kawasaki reported:

When I ran workloads on f2fs using v6.5-rcX with fixes [1][2] and a zoned block
devices with 4kb logical block size, I observe mount failure as follows. When
I revert this commit, the failure goes away.

[  167.781975][ T1555] F2FS-fs (dm-0): IO Block Size:        4 KB
[  167.890728][ T1555] F2FS-fs (dm-0): Found nat_bits in checkpoint
[  171.482588][ T1555] F2FS-fs (dm-0): Zone without valid block has non-zero write pointer. Reset the write pointer: wp[0x1300,0x8]
[  171.496000][ T1555] F2FS-fs (dm-0): (0) : Unaligned zone reset attempted (block 280000 + 80000)
[  171.505037][ T1555] F2FS-fs (dm-0): Discard zone failed:  (errno=-5)

The patch replaced "sbi->log_blocksize - SECTOR_SHIFT" with
"sbi->log_sectors_per_block". However, I think these two are not equal when the
device has 4k logical block size. The former uses Linux kernel sector size 512
byte. The latter use 512b sector size or 4kb sector size depending on the
device. mkfs.f2fs obtains logical block size via BLKSSZGET ioctl from the device
and reflects it to the value sbi->log_sector_size_per_block. This causes
unexpected write pointer calculations in check_zone_write_pointer(). This
resulted in unexpected zone reset and the mount failure.

[1] https://lkml.kernel.org/linux-f2fs-devel/20230711050101.GA19128@lst.de/
[2] https://lore.kernel.org/linux-f2fs-devel/20230804091556.2372567-1-shinichiro.kawasaki@wdc.com/

Cc: stable@vger.kernel.org
Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Fixes: bfd476623999 ("f2fs: clean up w/ sbi->log_sectors_per_block")
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/segment.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 0457d620011f..cbb4bd95ea19 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4846,17 +4846,17 @@ static int check_zone_write_pointer(struct f2fs_sb_info *sbi,
 {
 	unsigned int wp_segno, wp_blkoff, zone_secno, zone_segno, segno;
 	block_t zone_block, wp_block, last_valid_block;
+	unsigned int log_sectors_per_block = sbi->log_blocksize - SECTOR_SHIFT;
 	int i, s, b, ret;
 	struct seg_entry *se;
 
 	if (zone->type != BLK_ZONE_TYPE_SEQWRITE_REQ)
 		return 0;
 
-	wp_block = fdev->start_blk + (zone->wp >> sbi->log_sectors_per_block);
+	wp_block = fdev->start_blk + (zone->wp >> log_sectors_per_block);
 	wp_segno = GET_SEGNO(sbi, wp_block);
 	wp_blkoff = wp_block - START_BLOCK(sbi, wp_segno);
-	zone_block = fdev->start_blk + (zone->start >>
-						sbi->log_sectors_per_block);
+	zone_block = fdev->start_blk + (zone->start >> log_sectors_per_block);
 	zone_segno = GET_SEGNO(sbi, zone_block);
 	zone_secno = GET_SEC_FROM_SEG(sbi, zone_segno);
 
@@ -4906,7 +4906,7 @@ static int check_zone_write_pointer(struct f2fs_sb_info *sbi,
 			    "pointer. Reset the write pointer: wp[0x%x,0x%x]",
 			    wp_segno, wp_blkoff);
 		ret = __f2fs_issue_discard_zone(sbi, fdev->bdev, zone_block,
-				zone->len >> sbi->log_sectors_per_block);
+					zone->len >> log_sectors_per_block);
 		if (ret)
 			f2fs_err(sbi, "Discard zone failed: %s (errno=%d)",
 				 fdev->path, ret);
@@ -4967,6 +4967,7 @@ static int fix_curseg_write_pointer(struct f2fs_sb_info *sbi, int type)
 	struct blk_zone zone;
 	unsigned int cs_section, wp_segno, wp_blkoff, wp_sector_off;
 	block_t cs_zone_block, wp_block;
+	unsigned int log_sectors_per_block = sbi->log_blocksize - SECTOR_SHIFT;
 	sector_t zone_sector;
 	int err;
 
@@ -4978,8 +4979,8 @@ static int fix_curseg_write_pointer(struct f2fs_sb_info *sbi, int type)
 		return 0;
 
 	/* report zone for the sector the curseg points to */
-	zone_sector = (sector_t)(cs_zone_block - zbd->start_blk) <<
-						sbi->log_sectors_per_block;
+	zone_sector = (sector_t)(cs_zone_block - zbd->start_blk)
+		<< log_sectors_per_block;
 	err = blkdev_report_zones(zbd->bdev, zone_sector, 1,
 				  report_one_zone_cb, &zone);
 	if (err != 1) {
@@ -4991,10 +4992,10 @@ static int fix_curseg_write_pointer(struct f2fs_sb_info *sbi, int type)
 	if (zone.type != BLK_ZONE_TYPE_SEQWRITE_REQ)
 		return 0;
 
-	wp_block = zbd->start_blk + (zone.wp >> sbi->log_sectors_per_block);
+	wp_block = zbd->start_blk + (zone.wp >> log_sectors_per_block);
 	wp_segno = GET_SEGNO(sbi, wp_block);
 	wp_blkoff = wp_block - START_BLOCK(sbi, wp_segno);
-	wp_sector_off = zone.wp & GENMASK(sbi->log_sectors_per_block - 1, 0);
+	wp_sector_off = zone.wp & GENMASK(log_sectors_per_block - 1, 0);
 
 	if (cs->segno == wp_segno && cs->next_blkoff == wp_blkoff &&
 		wp_sector_off == 0)
@@ -5021,8 +5022,8 @@ static int fix_curseg_write_pointer(struct f2fs_sb_info *sbi, int type)
 	if (!zbd)
 		return 0;
 
-	zone_sector = (sector_t)(cs_zone_block - zbd->start_blk) <<
-						sbi->log_sectors_per_block;
+	zone_sector = (sector_t)(cs_zone_block - zbd->start_blk)
+		<< log_sectors_per_block;
 	err = blkdev_report_zones(zbd->bdev, zone_sector, 1,
 				  report_one_zone_cb, &zone);
 	if (err != 1) {
@@ -5040,7 +5041,7 @@ static int fix_curseg_write_pointer(struct f2fs_sb_info *sbi, int type)
 			    "Reset the zone: curseg[0x%x,0x%x]",
 			    type, cs->segno, cs->next_blkoff);
 		err = __f2fs_issue_discard_zone(sbi, zbd->bdev,	cs_zone_block,
-					zone.len >> sbi->log_sectors_per_block);
+					zone.len >> log_sectors_per_block);
 		if (err) {
 			f2fs_err(sbi, "Discard zone failed: %s (errno=%d)",
 				 zbd->path, err);
-- 
2.41.0.640.ga95def55d0-goog