[PATCH 2/3] erofs-utils: lib: avoid using lseek in diskbuf

[Gao Xiang]

On 2025/9/18 23:12, Yifan Zhao wrote:
> From: zhaoyifan <zhaoyifan28 at huawei.com>
> 
> The current `diskbuf` implementation uses `lseek` to operate file offset,
> preventing multiple streams from writing to the same file. Let's replace
> `write` + `lseek` with `pwrite` to enable this use pattern.
> 
> Signed-off-by: Yifan Zhao <zhaoyifan28 at huawei.com>

It seems this patch breaks CI,
https://github.com/erofs/erofsnightly/actions/runs/17902749255/job/50898433325

2025-09-22T02:28:33.7178065Z Processing linux-5.4.256/virt/kvm/arm/vgic/vgic-v3.c ...
2025-09-22T02:28:33.7178615Z Processing linux-5.4.256/virt/kvm/arm/vgic/vgic-v4.c ...
2025-09-22T02:28:33.7179125Z Processing linux-5.4.256/virt/kvm/arm/vgic/vgic.c ...
2025-09-22T02:28:33.7179623Z Processing linux-5.4.256/virt/kvm/arm/vgic/vgic.h ...
2025-09-22T02:28:33.7180092Z Processing linux-5.4.256/virt/lib/Kconfig ...
2025-09-22T02:28:33.7180516Z Processing linux-5.4.256/virt/lib/Makefile ...
2025-09-22T02:28:33.7180965Z Processing linux-5.4.256/virt/lib/irqbypass.c ...
2025-09-22T02:28:33.7181377Z Build completed.
2025-09-22T02:28:33.7181556Z
2025-09-22T02:28:33.7181658Z ------
2025-09-22T02:28:33.7181969Z Filesystem UUID: 83e743e1-72ca-40cb-bc27-7621af1f88fc
2025-09-22T02:28:33.7182448Z Filesystem total blocks: 239166 (of 4096-byte blocks)
2025-09-22T02:28:33.7182882Z Filesystem total inodes: 70074
2025-09-22T02:28:33.7183231Z Filesystem total metadata blocks: 2060
2025-09-22T02:28:33.7183705Z Filesystem total deduplicated bytes (of source files): 1021788
2025-09-22T02:28:33.8980774Z erofsfuse 1.8.10-g475e9afd
2025-09-22T02:28:33.8981380Z <W> erofs: main() Line[755] lowerdir.erofs.img mounted on lowerdir with offset 0
2025-09-22T02:28:34.0928040Z Makefile:1: *** missing separator.  Stop.

...

Thanks,
Gao Xiang