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

[nl6720 via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

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.
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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