linux-toradex.git/include/linux/bio.h, branch v5.0-rc3

blkcg: remove bio_disassociate_task()

2018-12-08T05:26:38+00:00

Now that a bio only holds a blkg reference, so clean up is simply
putting back that reference. Remove bio_disassociate_task() as it just
calls bio_disassociate_blkg() and call the latter directly.

Signed-off-by: Dennis Zhou 
Acked-by: Tejun Heo 
Reviewed-by: Josef Bacik 
Signed-off-by: Jens Axboe

blkcg: remove bio->bi_css and instead use bio->bi_blkg

2018-12-08T05:26:37+00:00

Prior patches ensured that any bio that interacts with a request_queue
is properly associated with a blkg. This makes bio->bi_css unnecessary
as blkg maintains a reference to blkcg already.

This removes the bio field bi_css and transfers corresponding uses to
access via bi_blkg.

Signed-off-by: Dennis Zhou 
Reviewed-by: Josef Bacik 
Acked-by: Tejun Heo 
Signed-off-by: Jens Axboe

blkcg: associate writeback bios with a blkg

2018-12-08T05:26:37+00:00

One of the goals of this series is to remove a separate reference to
the css of the bio. This can and should be accessed via bio_blkcg(). In
this patch, wbc_init_bio() now requires a bio to have a device
associated with it.

Signed-off-by: Dennis Zhou 
Reviewed-by: Josef Bacik 
Acked-by: Tejun Heo 
Signed-off-by: Jens Axboe

blkcg: associate a blkg for pages being evicted by swap

2018-12-08T05:26:37+00:00

A prior patch in this series added blkg association to bios issued by
cgroups. There are two other paths that we want to attribute work back
to the appropriate cgroup: swap and writeback. Here we modify the way
swap tags bios to include the blkg. Writeback will be tackle in the next
patch.

Signed-off-by: Dennis Zhou 
Reviewed-by: Josef Bacik 
Acked-by: Tejun Heo 
Signed-off-by: Jens Axboe

blkcg: associate blkg when associating a device

2018-12-08T05:26:37+00:00

Previously, blkg association was handled by controller specific code in
blk-throttle and blk-iolatency. However, because a blkg represents a
relationship between a blkcg and a request_queue, it makes sense to keep
the blkg->q and bio->bi_disk->queue consistent.

This patch moves association into the bio_set_dev macro(). This should
cover the majority of cases where the device is set/changed keeping the
two pointers consistent. Fallback code is added to
blkcg_bio_issue_check() to catch any missing paths.

Signed-off-by: Dennis Zhou 
Reviewed-by: Josef Bacik 
Signed-off-by: Jens Axboe

blkcg: introduce common blkg association logic

2018-12-08T05:26:36+00:00

There are 3 ways blkg association can happen: association with the
current css, with the page css (swap), or from the wbc css (writeback).

This patch handles how association is done for the first case where we
are associating bsaed on the current css. If there is already a blkg
associated, the css will be reused and association will be redone as the
request_queue may have changed.

Signed-off-by: Dennis Zhou 
Reviewed-by: Josef Bacik 
Acked-by: Tejun Heo 
Signed-off-by: Jens Axboe

blkcg: revert blkcg cleanups series

2018-11-02T01:59:53+00:00

This reverts a series committed earlier due to null pointer exception
bug report in [1]. It seems there are edge case interactions that I did
not consider and will need some time to understand what causes the
adverse interactions.

The original series can be found in [2] with a follow up series in [3].

[1] https://www.spinics.net/lists/cgroups/msg20719.html
[2] https://lore.kernel.org/lkml/20180911184137.35897-1-dennisszhou@gmail.com/
[3] https://lore.kernel.org/lkml/20181020185612.51587-1-dennis@kernel.org/

This reverts the following commits:
d459d853c2ed, b2c3fa546705, 101246ec02b5, b3b9f24f5fcc, e2b0989954ae,
f0fcb3ec89f3, c839e7a03f92, bdc2491708c4, 74b7c02a9bc1, 5bf9a1f3b4ef,
a7b39b4e961c, 07b05bcc3213, 49f4c2dc2b50, 27e6fa996c53

Signed-off-by: Dennis Zhou 
Signed-off-by: Jens Axboe

blkcg: reassociate bios when make_request() is called recursively

2018-10-20T21:39:55+00:00

When submitting a bio, multiple recursive calls to make_request() may
occur. This causes the initial associate done in blkcg_bio_issue_check()
to be incorrect and reference the prior request_queue. This introduces
a helper to do reassociation when make_request() is recursively called.

Fixes: a7b39b4e961c ("blkcg: always associate a bio with a blkg")
Reported-by: Valdis Kletnieks 
Signed-off-by: Dennis Zhou 
Tested-by: Valdis Kletnieks 
Signed-off-by: Jens Axboe

block: don't include bug.h from bio.h

2018-09-24T18:34:02+00:00

No need to pull in the BUG() defintion.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: don't include io.h from bio.h

2018-09-24T18:34:00+00:00

Now that we don't need an override for BIOVEC_PHYS_MERGEABLE there is
no need to drag this header in.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe