| Message ID | 20210122080014.174391-4-damien.lemoal@wdc.com |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
Damien, > Zoned block devices have different granularity constraints for write > operations into sequential zones. E.g. ZBC and ZAC devices require > that writes be aligned to the device physical block size while NVMe > ZNS devices allow logical block size aligned write operations. To > correctly handle such difference, use the device zone write > granularity limit to set the block size of a zonefs volume, thus > allowing the smallest possible write unit for all zoned device types. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> -- Martin K. Petersen Oracle Linux Engineering
diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c index bec47f2d074b..8973d77ba000 100644 --- a/fs/zonefs/super.c +++ b/fs/zonefs/super.c @@ -1581,12 +1581,11 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent) sb->s_time_gran = 1; /* - * The block size is set to the device physical sector size to ensure - * that write operations on 512e devices (512B logical block and 4KB - * physical block) are always aligned to the device physical blocks, - * as mandated by the ZBC/ZAC specifications. + * The block size is set to the device zone write granularity to ensure + * that write operations are always aligned according to the device + * interface constraints. */ - sb_set_blocksize(sb, bdev_physical_block_size(sb->s_bdev)); + sb_set_blocksize(sb, bdev_zone_write_granularity(sb->s_bdev)); sbi->s_zone_sectors_shift = ilog2(bdev_zone_sectors(sb->s_bdev)); sbi->s_uid = GLOBAL_ROOT_UID; sbi->s_gid = GLOBAL_ROOT_GID;
Zoned block devices have different granularity constraints for write operations into sequential zones. E.g. ZBC and ZAC devices require that writes be aligned to the device physical block size while NVMe ZNS devices allow logical block size aligned write operations. To correctly handle such difference, use the device zone write granularity limit to set the block size of a zonefs volume, thus allowing the smallest possible write unit for all zoned device types. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> --- fs/zonefs/super.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)