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huaicheng avatar huaicheng commented on August 14, 2024

To extend the NVMe command set, if it's an admin cmd, check https://github.com/vtess/FEMU/blob/master/hw/femu/nvme-admin.c#L1029. Yes, you need to define your new NVMe command and implement the processing logics for both the software (e.g., NVMe driver) and FEMU.

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chillsoul avatar chillsoul commented on August 14, 2024

I have some new question now.

When i run FEMU, there is two disk (qemu image's and BBSSD's), I want to know the LBA of a file in BBSSD to do something with BBSSD FTL.

If i use FIEMAP ioctl, it will print a filesystem logical address (FS LBA). And after that i found the FS LBA is not the LBA in BBSSD.I think it's because the two disk shared the filesystem logical address space (e.g. 0~100 for qemu image, 101~150 for BBSSD,if the file's FS LBA is 101,in fact the device LBA is 1).

Is there a easy way to get the true device LBA of a file? @huaicheng

Here is the detail: https://stackoverflow.com/questions/76762319/how-to-get-the-start-logical-address-of-a-block-device-partition.

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huaicheng avatar huaicheng commented on August 14, 2024

If your file system is mounted on FEMU BBSSD, it owns the entire LBA space.

It seems filefrag is reporting offsets in blocks of 4096 bytes, by default, FEMU BBSSD is using 512 block sizes. You might need to do the conversion here by yourself.

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