Re: [f2fs-dev] [PATCH] f2fs-tools: prefer physical over logical block size

[Chao Yu via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

On 4/27/25 17:30, nl6720 wrote:
> On Sunday, 27 April 2025 11:45:59 EEST Chao Yu wrote:
>> On 4/25/25 09:36, nl6720 via Linux-f2fs-devel wrote:
>>> Some drives operate in "512e" configuration with their logical block
>>> size set to 512 bytes for legacy compatibility reasons while providing
>>> a more optimal 4096 byte value as the physical block size.
>>>
>>> Since the physical block size is the smallest unit a physical storage
>>> device can write atomically, prefer it over the logical block size.
>>>
>>> Closes: https://github.com/jaegeuk/f2fs-tools/issues/29
>>
>> f2fs uses PAGE_SIZE as block size, commonly it's 4096 rather than 512?
> 
> The thing mkfs.f2fs calls "sector size" in its output is 512 on 512e drives
> instead of 4096.

How about printing block size of f2fs as below:

output of mkfs.f2fs:

Info: sector size = 512
Info: total sectors = 16777216 (8192 MB)
Info: block size = 4096

Thanks,

> E.g.:
> 
>     F2FS-tools: mkfs.f2fs Ver: 1.16.0 (2023-04-11)
> 
> Info: Disable heap-based policy
> Info: Debug level = 0
> Info: Trim is enabled
> Info: [/dev/disk/by-partlabel/512e] Disk Model: QEMU HARDDISK   
> Info: Segments per section = 1
> Info: Sections per zone = 1
> Info: sector size = 512
> Info: total sectors = 124997632 (61034 MB)
> Info: zone aligned segment0 blkaddr: 512
> Info: format version with
>   "Linux version 6.13.8-arch1-1 (linux@archlinux) (gcc (GCC) 14.2.1 20250207, GNU ld (GNU Binutils) 2.44) #1 SMP PREEMPT_DYNAMIC Sun, 23 Mar 2025 17:17:30 +0000"
> Info: [/dev/disk/by-partlabel/512e] Discarding device
> Info: This device doesn't support BLKSECDISCARD
> Info: Discarded 61034 MB
> Info: Overprovision ratio = 0.590%
> Info: Overprovision segments = 179 (GC reserved = 176)
> Info: format successful
> 
> 
> nl6720
> 
> 



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