Never mind...
The following code covers it:
+ if (split) {
+ bio_chain(split, *bio);
+ generic_make_request(*bio);
+ *bio = split;
+ }
My other question is, can we avoid calling the queue_split from
individual drivers make_request()? Can
Kent,
The blk_queue_split(), splits a bio into at most two bios right? So,
if the original bio spans larger space than two bios can cover
(restriction by the lower driver in the stack), this might not work?
Am I reading it incorrectly?
Thanks!
Regards,
Muthu
On Wed, Feb 26, 2014 at 3:39 PM,
Kent,
The blk_queue_split(), splits a bio into at most two bios right? So,
if the original bio spans larger space than two bios can cover
(restriction by the lower driver in the stack), this might not work?
Am I reading it incorrectly?
Thanks!
Regards,
Muthu
On Wed, Feb 26, 2014 at 3:39 PM,
Never mind...
The following code covers it:
+ if (split) {
+ bio_chain(split, *bio);
+ generic_make_request(*bio);
+ *bio = split;
+ }
My other question is, can we avoid calling the queue_split from
individual drivers make_request()? Can
On Fri, 28 Feb 2014, Kent Overstreet wrote:
On Thu, Feb 27, 2014 at 12:22:54PM -0500, Matthew Wilcox wrote:
On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
We do this by adding calls to blk_queue_split() to the various
make_request functions that need it - a few can already
On Fri, 28 Feb 2014, Kent Overstreet wrote:
On Thu, Feb 27, 2014 at 12:22:54PM -0500, Matthew Wilcox wrote:
On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
We do this by adding calls to blk_queue_split() to the various
make_request functions that need it - a few can already
On Thu, Feb 27, 2014 at 12:22:54PM -0500, Matthew Wilcox wrote:
> On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
> > We do this by adding calls to blk_queue_split() to the various
> > make_request functions that need it - a few can already handle arbitrary
> > size bios. Note
On Thu, Feb 27, 2014 at 12:22:54PM -0500, Matthew Wilcox wrote:
On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
We do this by adding calls to blk_queue_split() to the various
make_request functions that need it - a few can already handle arbitrary
size bios. Note that we
On Thu, Feb 27, 2014 at 12:22:54PM -0500, Matthew Wilcox wrote:
> On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
> > We do this by adding calls to blk_queue_split() to the various
> > make_request functions that need it - a few can already handle arbitrary
> > size bios. Note
On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
> We do this by adding calls to blk_queue_split() to the various
> make_request functions that need it - a few can already handle arbitrary
> size bios. Note that we add the call _after_ any call to blk_queue_bounce();
> this means
On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
We do this by adding calls to blk_queue_split() to the various
make_request functions that need it - a few can already handle arbitrary
size bios. Note that we add the call _after_ any call to blk_queue_bounce();
this means that
On Thu, Feb 27, 2014 at 12:22:54PM -0500, Matthew Wilcox wrote:
On Wed, Feb 26, 2014 at 03:39:49PM -0800, Kent Overstreet wrote:
We do this by adding calls to blk_queue_split() to the various
make_request functions that need it - a few can already handle arbitrary
size bios. Note that we
The way the block layer is currently written, it goes to great lengths
to avoid having to split bios; upper layer code (such as bio_add_page())
checks what the underlying device can handle and tries to always create
bios that don't need to be split.
But this approach becomes unwieldy and
The way the block layer is currently written, it goes to great lengths
to avoid having to split bios; upper layer code (such as bio_add_page())
checks what the underlying device can handle and tries to always create
bios that don't need to be split.
But this approach becomes unwieldy and
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