User: Password:
|
|
Subscribe / Log in / New account

"doesn't support DPO or FUA"

"doesn't support DPO or FUA"

Posted Aug 19, 2010 20:58 UTC (Thu) by willy (subscriber, #9762)
In reply to: "doesn't support DPO or FUA" by cesarb
Parent article: The end of block barriers

If the drive doesn't support FUA, the block layer sends down the FUA-tagged command, then sends down another flush. So you get:

write, write, write, flush, important write, flush, write, write, write

instead of:

write, write, write, flush, important write FUA, write, write, write

This is documented in Documentation/block/barrier.txt if you're curious in learning more.


(Log in to post comments)

"doesn't support DPO or FUA"

Posted Aug 20, 2010 11:14 UTC (Fri) by Hknr (guest, #67789) [Link]

From Documentation/block/barrier.txt:

»All low level drivers have to are implementing its prepare_flush_fn»...

Does nobody ever (proof-)read these Documents?

"doesn't support DPO or FUA"

Posted Aug 20, 2010 22:37 UTC (Fri) by cesarb (subscriber, #6266) [Link]

> Does nobody ever (proof-)read these Documents?

Some people do. Every once in a while I see a batch of spelling fix patches on the git history of the kernel. After all, anyone can send a spelling fix patch.

"doesn't support DPO or FUA"

Posted Aug 29, 2010 22:24 UTC (Sun) by Duncan (guest, #6647) [Link]

>> "drivers have are implementing its prepare_flush_fn"...

Gaah! Spammers in the kernel docs!


Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds