Tejun Heo wrote:
Mark Lord wrote:
The READ/WRITE LONG commands are theoretically obsolete,
but the majority of drives in existance still implement them.
The WRITE_LONG and WRITE_LONG_ONCE commands are of particular
interest for fault injection testing -- eg. creating "media errors"
at specific locations on a disk.
The fussy bit is that these commands require a non-standard
sector size, usually 520 bytes instead of 512.
This patch adds support to libata for READ/WRITE LONG commands
issued via SG_IO/ATA_16.
This patch was generated against a 2.6.21-rc3-git7 base:
I think it would be better if this comes in two patches. One to add
qc->sect_size and convert all users of ATA_SECT_SIZE to qc->sect_size
and the other one to implement READ/WRITE LONG. Another question is
whether this needs to be included into mainline. This is definitely
useful but it is mostly for debugging/testing.
Hmmm... But we're gonna need qc->sect_size anyway for devices with
larger sector sizes and overhead for supporting READ/WRITE LONG is
nearly nill, so I'm voting for inclusion.
Thanks.
I just want to add that this patch has been incredibly useful for us in
testing the error handling & RAID. Nothing like "real" media errors on
demand to validate your assumptions ;-)
ric
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