On Tue, Mar 11 2008 at 0:39 +0200, FUJITA Tomonori <tomof@xxxxxxx> wrote: > CC'ed linux-ide, > > On Mon, 10 Mar 2008 16:10:36 +0200 > Boaz Harrosh <bharrosh@xxxxxxxxxxx> wrote: > >> On Sun, Mar 09 2008 at 6:44 +0200, FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx> wrote: >>> This patchset adds new two helper functions to copy data between an SG >>> table and liner buffer, and converts severl LLDs to use them. >>> >>> The new APIs are used mainly in the code to spoof SCSI commands >>> (INQUIRY, READ CAPACITY, MODE SENSE etc), that is, LLDs build a fake >>> reposense and copy it to the sg list in scsi_cmnd struct. Several LLDs >>> have similar functions for such code. This patchset removes such >>> duplication. >>> >>> Another reason to do this work is that because we relaxed the default >>> alignment requirements (from 511 to 3) post 2.6.24, the above commands >>> might come with multiple scatter gather entries but several LLDs make >>> the assumption that such commands come with only one sg entries and >>> can't handle multiple sg entries. The new APIs can handle multiple sg >>> entries so LLDs don't need to care about anything. >>> >>> The first patch adds the new APIs to lib/scatterlist.c and the rest >>> are for SCSI. I like to push the whole patchset via scsi-misc (since >>> it's easier). >>> >>> This is against scsi-misc (a6680f71ca27ea78c4c4e577076aecb9ace476f1). >>> >>> arch/ia64/hp/sim/simscsi.c | 23 ++-------- >>> drivers/scsi/3w-9xxx.c | 21 ++++----- >>> drivers/scsi/3w-xxxx.c | 12 +---- >>> drivers/scsi/aacraid/aachba.c | 49 ++++++++-------------- >>> drivers/scsi/ips.c | 50 ++++------------------- >>> drivers/scsi/ps3rom.c | 92 ++++------------------------------------ >>> drivers/scsi/scsi_debug.c | 79 ++++++----------------------------- >>> drivers/scsi/stex.c | 66 ++++------------------------- >>> include/linux/scatterlist.h | 5 ++ >>> include/scsi/scsi_cmnd.h | 14 ++++++ >>> lib/scatterlist.c | 90 ++++++++++++++++++++++++++++++++++++++++ >>> 11 files changed, 182 insertions(+), 319 deletions(-) >>> >>> >> Hi Tomo. Nice cleanup, Cheers. >> >> Have you had a look at drivers/usb/storage/protocol.c usb_stor_access_xfer_buf() ? >> It looks like it could also use these, but there they have a twist where they want >> to do it in parts. Do you think that the code there could also use the helpers >> presented here somehow? (I know that one of the USB guys was asking about it) > > I've not. If the USB people are eager to use the new APIs, I'll try > though I prefer to keep them simple. > CC: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> CC: Matthew Dharm <mdharm-scsi@xxxxxxxxxxxxxxxxxx> > There are other potential users of the new APIs, gdth and libata. > > I think that gdth can use the APIs without any changes to the APIs but > I leave it to a gdth expert. Sure I can do that. Thanks > > ata_scsi_simulate could use the new APIs but it directly builds a > response in the buffer of a sg list instead of building a response in > temporary buffer and copying it to a sg list. So the new APIs are not > fit for it. If libata people are fine with switching to the latter, > I'll send a patch. Boaz -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
