linux.git/drivers/md/bcache/util.c, branch v4.18

bcache: Move couple of functions to sysfs.c

2018-05-28T20:53:20+00:00

There is couple of functions that are used exclusively in sysfs.c.
Move it to there and make them static.

Besides above, it will allow further clean up.

No functional change intended.

Signed-off-by: Andy Shevchenko 
Signed-off-by: Coly Li 
Signed-off-by: Jens Axboe

bcache: Fix kernel-doc warnings

2018-03-19T02:15:20+00:00

Avoid that building with W=1 triggers warnings about the kernel-doc
headers.

Signed-off-by: Bart Van Assche 
Reviewed-by: Michael Lyle 
Signed-off-by: Jens Axboe

bcache: Annotate switch fall-through

2018-03-19T02:15:20+00:00

This patch avoids that building with W=1 triggers complaints about
switch fall-throughs.

Signed-off-by: Bart Van Assche 
Reviewed-by: Michael Lyle 
Signed-off-by: Jens Axboe

block: move bio_alloc_pages() to bcache

2018-01-06T16:18:00+00:00

bcache is the only user of bio_alloc_pages(), so move this function into
bcache, and avoid it being misused in the future.

Also rename it to bch_bio_allo_pages() since it is bcache only.

Signed-off-by: Ming Lei 
Signed-off-by: Jens Axboe

bcache: comment on direct access to bvec table

2018-01-06T16:18:00+00:00

All direct access to bvec table are safe even after multipage bvec is
supported.

Cc: linux-bcache@vger.kernel.org
Acked-by: Coly Li 
Signed-off-by: Ming Lei 
Signed-off-by: Jens Axboe

bcache: writeback rate clamping: make 32 bit safe

2017-10-16T19:00:10+00:00

Sorry this got through to linux-block, was detected by the kbuilds test
robot.  NSEC_PER_SEC is a long constant; 2.5 * 10^9 doesn't fit in a
signed long constant.

Fixes: e41166c5c44e ("bcache: writeback rate shouldn't artifically clamp")
Reviewed-by: Coly Li 
Signed-off-by: Michael Lyle 
Signed-off-by: Jens Axboe

bcache: smooth writeback rate control

2017-10-16T15:07:26+00:00

This works in conjunction with the new PI controller.  Currently, in
real-world workloads, the rate controller attempts to write back 1
sector per second.  In practice, these minimum-rate writebacks are
between 4k and 60k in test scenarios, since bcache aggregates and
attempts to do contiguous writes and because filesystems on top of
bcachefs typically write 4k or more.

Previously, bcache used to guarantee to write at least once per second.
This means that the actual writeback rate would exceed the configured
amount by a factor of 8-120 or more.

This patch adjusts to be willing to sleep up to 2.5 seconds, and to
target writing 4k/second.  On the smallest writes, it will sleep 1
second like before, but many times it will sleep longer and load the
backing device less.  This keeps the loading on the cache and backing
device related to writeback more consistent when writing back at low
rates.

Signed-off-by: Michael Lyle 
Reviewed-by: Coly Li 
Signed-off-by: Jens Axboe

bcache: fix bch_hprint crash and improve output

2017-09-06T14:17:33+00:00

Most importantly, solve a crash where %llu was used to format signed
numbers.  This would cause a buffer overflow when reading sysfs
writeback_rate_debug, as only 20 bytes were allocated for this and
%llu writes 20 characters plus a null.

Always use the units mechanism rather than having different output
paths for simplicity.

Also, correct problems with display output where 1.10 was a larger
number than 1.09, by multiplying by 10 and then dividing by 1024 instead
of dividing by 100.  (Remainders of >= 1000 would print as .10).

Minor changes: Always display the decimal point instead of trying to
omit it based on number of digits shown.  Decide what units to use
based on 1000 as a threshold, not 1024 (in other words, always print
at most 3 digits before the decimal point).

Signed-off-by: Michael Lyle 
Reported-by: Dmitry Yu Okunev 
Acked-by: Kent Overstreet 
Reviewed-by: Coly Li 
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe

sched/headers: Prepare for new header dependencies before moving code to

2017-03-02T07:42:27+00:00

We are going to split  out of , which
will have to be picked up from other headers and .c files.

Create a trivial placeholder  file that just
maps to  to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

md: more open-coded offset_in_page()

2016-01-04T15:29:12+00:00

Signed-off-by: Al Viro