Re: [f2fs-dev] [PATCH v6] f2fs: fix zoned block device information initialization

[Daeho Jeong <daeho43@gmail.com>]

On Thu, Mar 28, 2024 at 12:23 AM Chao Yu <chao@kernel.org> wrote:
>
> From: Wenjie Qi <qwjhust@gmail.com>
>
> If the max open zones of zoned devices are less than
> the active logs of F2FS, the device may error due to
> insufficient zone resources when multiple active logs
> are being written at the same time.
>
> Signed-off-by: Wenjie Qi <qwjhust@gmail.com>
> Signed-off-by: Chao Yu <chao@kernel.org>
> ---
> v6:
> - add check condition to avoid remount failure.
>  fs/f2fs/f2fs.h  |  1 +
>  fs/f2fs/super.c | 27 +++++++++++++++++++++++++++
>  2 files changed, 28 insertions(+)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 0550929dc6e5..694f8a52cb84 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1559,6 +1559,7 @@ struct f2fs_sb_info {
>
>  #ifdef CONFIG_BLK_DEV_ZONED
>         unsigned int blocks_per_blkz;           /* F2FS blocks per zone */
> +       unsigned int max_open_zones;            /* max open zone resources of the zoned device */
>  #endif
>
>         /* for node-related operations */
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 7c45929671ad..642540782471 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2326,6 +2326,17 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
>         if (err)
>                 goto restore_opts;
>
> +#ifdef CONFIG_BLK_DEV_ZONED
> +       if (f2fs_is_multi_device(sbi) &&

Why do we check multiple devices' condition here?

Thanks,

> +               sbi->max_open_zones < F2FS_OPTION(sbi).active_logs) {
> +               f2fs_err(sbi,
> +                       "zoned: max open zones %u is too small, need at least %u open zones",
> +                                sbi->max_open_zones, F2FS_OPTION(sbi).active_logs);
> +               err = -EINVAL;
> +               goto restore_opts;
> +       }
> +#endif
> +
>         /* flush outstanding errors before changing fs state */
>         flush_work(&sbi->s_error_work);
>
> @@ -3868,11 +3879,24 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
>         sector_t nr_sectors = bdev_nr_sectors(bdev);
>         struct f2fs_report_zones_args rep_zone_arg;
>         u64 zone_sectors;
> +       unsigned int max_open_zones;
>         int ret;
>
>         if (!f2fs_sb_has_blkzoned(sbi))
>                 return 0;
>
> +       if (bdev_is_zoned(FDEV(devi).bdev)) {
> +               max_open_zones = bdev_max_open_zones(bdev);
> +               if (max_open_zones && (max_open_zones < sbi->max_open_zones))
> +                       sbi->max_open_zones = max_open_zones;
> +               if (sbi->max_open_zones < F2FS_OPTION(sbi).active_logs) {
> +                       f2fs_err(sbi,
> +                               "zoned: max open zones %u is too small, need at least %u open zones",
> +                               sbi->max_open_zones, F2FS_OPTION(sbi).active_logs);
> +                       return -EINVAL;
> +               }
> +       }
> +
>         zone_sectors = bdev_zone_sectors(bdev);
>         if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
>                                 SECTOR_TO_BLOCK(zone_sectors))
> @@ -4186,6 +4210,9 @@ static int f2fs_scan_devices(struct f2fs_sb_info *sbi)
>
>         logical_blksize = bdev_logical_block_size(sbi->sb->s_bdev);
>         sbi->aligned_blksize = true;
> +#ifdef CONFIG_BLK_DEV_ZONED
> +       sbi->max_open_zones = UINT_MAX;
> +#endif
>
>         for (i = 0; i < max_devices; i++) {
>                 if (i == 0)
> --
> 2.40.1
>
>
>
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