Sets two variables that limit the size of the request.
- The request queue's max_sectors, which is a soft size in
- in units of 512 byte sectors, and could be dynamically varied
+ units of 512 byte sectors, and could be dynamically varied
by the core kernel.
- The request queue's max_hw_sectors, which is a hard limit
blk_queue_invalidate_tags(request_queue_t *q)
- Clear the internal block tag queue and readd all the pending requests
+ Clear the internal block tag queue and re-add all the pending requests
to the request queue. The driver will receive them again on the
next request_fn run, just like it did the first time it encountered
them.
Kvec i/o:
- Ben LaHaise's aio code uses a slighly different structure instead
+ Ben LaHaise's aio code uses a slightly different structure instead
of kiobufs, called a kvec_cb. This contains an array of <page, offset, len>
tuples (very much like the networking code), together with a callback function
and data pointer. This is embedded into a brw_cb structure when passed
for a queue.
4.2 Request flows seen by I/O schedulers
-All requests seens by I/O schedulers strictly follow one of the following three
+All requests seen by I/O schedulers strictly follow one of the following three
flows.
set_req_fn ->
and Linus' comments - Jan 2001)
9.2 Discussions about kiobuf and bh design on lkml between sct, linus, alan
et al - Feb-March 2001 (many of the initial thoughts that led to bio were
-brought up in this discusion thread)
+brought up in this discussion thread)
9.3 Discussions on mempool on lkml - Dec 2001.