From: Ravish Tayal <ravish.tayal@gmail.com>
To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org
Subject: generic_make_request fucntion for scsi_disk
Date: Sat, 20 Jun 2009 19:35:03 +0530 [thread overview]
Message-ID: <e42309110906200705j6a731ecay204969f639af5330@mail.gmail.com> (raw)
Hello,
I am debugging Filesystem code for USB mass storage devices. I need
help to figure out after generic_make_request how the request is
placed to scsi disk (sd) requeset queue and than how sd qeueuecommand
to usb_storeage thread. (in which context, is it system call context)
inside generic_make_request
1. q = bdev_get_queue(bio->bi_bdev); [is sd.c register queue this
queue or any other scsi file?]
2. ret = q->make_request_fn(q, bio); [which file contain this
make_request_fn for scsi disk driver (generic)]
As per my unsderanding flow is like
Fat_writepage ->_block_write_full_page --> blkdev_writepage-->
block_write_full_page-->submit_bh-->generic_make_request ??? (sd ??)
----> queuecommand
Please suggest any sorce file, link or document.
with thanks
Ravish
next reply other threads:[~2009-06-20 14:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-20 14:05 Ravish Tayal [this message]
2009-06-20 14:20 ` generic_make_request fucntion for scsi_disk James Bottomley
[not found] ` <e42309110906200741x28595685jf56cd505d01cc795@mail.gmail.com>
2009-06-20 14:53 ` James Bottomley
[not found] ` <e42309110906200705j6a731ecay204969f639af5330-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-06-20 14:39 ` Alan Stern
[not found] <e42309110906200746u441b82acvec4e3e513253af0@mail.gmail.com>
2009-06-20 14:56 ` Alan Stern
2009-06-20 15:33 ` Ravish Tayal
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