On 2019-8-29 14:35, Shin'ichiro Kawasaki wrote:
> On sudden f2fs shutdown, zoned block device status and f2fs current
> segment positions in meta data can be inconsistent. When f2fs shutdown
> happens before write operations completes, write pointers of zoned block
> devices can go further but f2fs meta data keeps current segments at
> positions before the write operations. After remounting the f2fs, the
> inconsistency causes write operations not at write pointers and
> "Unaligned write command" error is reported. This error was observed when
> xfstests test case generic/388 was run with f2fs on a zoned block device.
>
> To avoid the error, have f2fs.fsck check consistency between each current
> segment's position and the write pointer of the zone the current segment
> points to. If the write pointer goes advance from the current segment,
> fix the current segment position setting at same as the write pointer
> position. In case the write pointer is behind the current segment, write
> zero data at the write pointer position to make write pointer position at
> same as the current segment.
>
> When inconsistencies are found, turn on c.bug_on flag in fsck_verify() to
> ask users to fix them or not. When inconsistencies get fixed, turn on
> 'force' flag in fsck_verify() to enforce fixes in following checks. This
> position fix is done at the beginning of do_fsck() function so that other
> checks reflect the current segment modification.
>
> Signed-off-by: Shin'ichiro Kawasaki <[email protected]>
> Reviewed-by: Chao Yu <[email protected]>
> ---
> fsck/fsck.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> fsck/fsck.h | 3 ++
> fsck/main.c | 2 +
> 3 files changed, 136 insertions(+)
>
> diff --git a/fsck/fsck.c b/fsck/fsck.c
> index 8953ca1..f45ca39 100644
> --- a/fsck/fsck.c
> +++ b/fsck/fsck.c
> @@ -2574,6 +2574,123 @@ out:
> return cnt;
> }
>
> +struct write_pointer_check_data {
> + struct f2fs_sb_info *sbi;
> + struct device_info *dev;
> +};
> +
> +static int fsck_chk_write_pointer(int i, struct blk_zone *blkz, void *opaque)
> +{
> + struct write_pointer_check_data *wpd = opaque;
> + struct f2fs_sb_info *sbi = wpd->sbi;
> + struct device_info *dev = wpd->dev;
> + struct f2fs_fsck *fsck = F2FS_FSCK(sbi);
> + block_t zone_block, wp_block, wp_blkoff, cs_block, b;
> + unsigned int zone_segno, wp_segno;
> + struct seg_entry *se;
> + struct curseg_info *cs;
> + int cs_index, ret;
> + int log_sectors_per_block = sbi->log_blocksize - SECTOR_SHIFT;
> + unsigned int segs_per_zone = sbi->segs_per_sec * sbi->secs_per_zone;
> + void *zero_blk;
> +
> + if (blk_zone_conv(blkz))
> + return 0;
> +
> + zone_block = dev->start_blkaddr
> + + (blk_zone_sector(blkz) >> log_sectors_per_block);
> + zone_segno = GET_SEGNO(sbi, zone_block);
> + wp_block = dev->start_blkaddr
> + + (blk_zone_wp_sector(blkz) >> log_sectors_per_block);
> + wp_segno = GET_SEGNO(sbi, wp_block);
> + wp_blkoff = wp_block - START_BLOCK(sbi, wp_segno);
> +
> + /* find the curseg which points to the zone */
> + for (cs_index = 0; cs_index < NO_CHECK_TYPE; cs_index++) {
> + cs = &SM_I(sbi)->curseg_array[cs_index];
> + if (zone_segno <= cs->segno &&
> + cs->segno < zone_segno + segs_per_zone)
> + break;
> + }
> +
> + if (cs_index >= NR_CURSEG_TYPE)
> + return 0;
> +
> + /* check write pointer consistency with the curseg in the zone */
> + cs_block = START_BLOCK(sbi, cs->segno) + cs->next_blkoff;
> + if (wp_block == cs_block)
> + return 0;
> +
> + if (!c.fix_on) {
> + MSG(0, "Inconsistent write pointer: "
> + "curseg %d[0x%x,0x%x] wp[0x%x,0x%x]\n",
> + cs_index, cs->segno, cs->next_blkoff, wp_segno, wp_blkoff);
> + fsck->chk.wp_inconsistent_zones++;
> + return 0;
> + }
> +
> + /*
> + * If the curseg is in advance from the write pointer, write zero to
> + * move the write pointer forward to the same position as the curseg.
> + */
> + if (wp_block < cs_block) {
> + ret = 0;
> + zero_blk = calloc(BLOCK_SZ, 1);
> + if (!zero_blk)
> + return -EINVAL;
> +
> + FIX_MSG("Advance write pointer to match with curseg %d: "
> + "[0x%x,0x%x]->[0x%x,0x%x]",
> + cs_index, wp_segno, wp_blkoff,
> + cs->segno, cs->next_blkoff);
> + for (b = wp_block; b < cs_block && !ret; b++)
> + ret = dev_write_block(zero_blk, b);
> +
> + fsck->chk.wp_fixed_zones++;
> + free(zero_blk);
> + return ret;
> + }
> +
> + /*
> + * If the write pointer is in advance from the curseg, modify the
> + * curseg position to be same as the write pointer.
> + */
> + FIX_MSG("Advance curseg %d: [0x%x,0x%x]->[0x%x,0x%x]",
> + cs_index, cs->segno, cs->next_blkoff, wp_segno, wp_blkoff);
> + se = get_seg_entry(sbi, wp_segno);
> + se->type = cs_index;
> + cs->segno = wp_segno;
> + cs->next_blkoff = wp_blkoff;
I have one more question, if current zone is closed, will wp_blkoff equal to
segment size (wp_block equal to zone size)?
As you know, .next_blkoff should never equal to segment size.
Thanks,
> + fsck->chk.wp_fixed_zones++;
> +
> + return 0;
> +}
> +
> +void fsck_chk_write_pointers(struct f2fs_sb_info *sbi)
> +{
> + unsigned int i;
> + struct f2fs_fsck *fsck = F2FS_FSCK(sbi);
> + struct write_pointer_check_data wpd = { sbi, NULL };
> +
> + if (c.zoned_model != F2FS_ZONED_HM)
> + return;
> +
> + for (i = 0; i < MAX_DEVICES; i++) {
> + if (!c.devices[i].path)
> + break;
> +
> + wpd.dev = c.devices + i;
> + if (f2fs_report_zones(i, fsck_chk_write_pointer, &wpd)) {
> + printf("[FSCK] Write pointer check failed: %s\n",
> + c.devices[i].path);
> + return;
> + }
> + }
> +
> + if (fsck->chk.wp_fixed_zones && c.fix_on)
> + write_curseg_info(sbi);
> +}
> +
> int fsck_chk_curseg_info(struct f2fs_sb_info *sbi)
> {
> struct curseg_info *curseg;
> @@ -2624,6 +2741,20 @@ int fsck_verify(struct f2fs_sb_info *sbi)
>
> printf("\n");
>
> + if (c.zoned_model == F2FS_ZONED_HM) {
> + printf("[FSCK] Write pointers consistency ");
> + if (fsck->chk.wp_inconsistent_zones == 0x0) {
> + printf(" [Ok..]\n");
> + } else {
> + printf(" [Fail] [0x%x]\n",
> + fsck->chk.wp_inconsistent_zones);
> + c.bug_on = 1;
> + }
> +
> + if (fsck->chk.wp_fixed_zones && c.fix_on)
> + force = 1;
> + }
> +
> if (c.feature & cpu_to_le32(F2FS_FEATURE_LOST_FOUND)) {
> for (i = 0; i < fsck->nr_nat_entries; i++)
> if (f2fs_test_bit(i, fsck->nat_area_bitmap) != 0)
> diff --git a/fsck/fsck.h b/fsck/fsck.h
> index d38e8de..aa3dbe7 100644
> --- a/fsck/fsck.h
> +++ b/fsck/fsck.h
> @@ -80,6 +80,8 @@ struct f2fs_fsck {
> u32 multi_hard_link_files;
> u64 sit_valid_blocks;
> u32 sit_free_segs;
> + u32 wp_fixed_zones;
> + u32 wp_inconsistent_zones;
> } chk;
>
> struct hard_link_node *hard_link_list_head;
> @@ -156,6 +158,7 @@ int fsck_chk_inline_dentries(struct f2fs_sb_info *,
> struct f2fs_node *,
> struct child_info *);
> void fsck_chk_checkpoint(struct f2fs_sb_info *sbi);
> int fsck_chk_meta(struct f2fs_sb_info *sbi);
> +void fsck_chk_write_pointers(struct f2fs_sb_info *);
> int fsck_chk_curseg_info(struct f2fs_sb_info *);
> void pretty_print_filename(const u8 *raw_name, u32 len,
> char out[F2FS_PRINT_NAMELEN], int enc_name);
> diff --git a/fsck/main.c b/fsck/main.c
> index 9aca024..4b4a789 100644
> --- a/fsck/main.c
> +++ b/fsck/main.c
> @@ -584,6 +584,8 @@ static void do_fsck(struct f2fs_sb_info *sbi)
>
> print_cp_state(flag);
>
> + fsck_chk_write_pointers(sbi);
> +
> fsck_chk_curseg_info(sbi);
>
> if (!c.fix_on && !c.bug_on) {
>
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