Re: [PATCH 03/21] fs/bdev: Add atomic write support info to statx

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Bart,

> Neither the SCSI SBC standard nor the NVMe standard defines a "minimum
> atomic write unit". So why to introduce something in the Linux kernel
> that is not defined in common storage standards?

>From SBC-5:

"The ATOMIC TRANSFER LENGTH GRANULARITY field indicates the minimum
transfer length for an atomic write command."

> I propose to leave out stx_atomic_write_unit_min from
> struct statx and also to leave out atomic_write_unit_min_sectors from
> struct queue_limits. My opinion is that we should not support block
> devices in the Linux kernel that do not write logical blocks atomically.

The statx values exist to describe the limits for I/Os sent using
RWF_ATOMIC and IOCB_ATOMIC. These limits may be different from other
reported values such as the filesystem block size and the logical block
size of the underlying device.

-- 
Martin K. Petersen	Oracle Linux Engineering



[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux