[f2fs-dev] [PATCH] Revert "f2fs: clean up w/ sbi->log_sectors_per_block"

[f2fs-dev] [PATCH] Revert "f2fs: clean up w/ sbi->log_sectors_per_block"

[Jaegeuk Kim]

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



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Re: [f2fs-dev] [PATCH] Revert "f2fs: clean up w/ sbi->log_sectors_per_block"

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Mon,  7 Aug 2023 12:52:19 -0700 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] Revert "f2fs: clean up w/ sbi->log_sectors_per_block"
    https://git.kernel.org/jaegeuk/f2fs/c/f7a177b8690e

You are awesome, thank you!
-- 
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Re: [f2fs-dev] [PATCH] Revert "f2fs: clean up w/ sbi->log_sectors_per_block"

[Chao Yu]

On 2023/8/8 3:52, Jaegeuk Kim wrote:
> 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>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,


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