linux-toradex.git/block/blk-wbt.c, branch v4.10-rc7

block: Avoid that sparse complains about context imbalance in __wbt_wait()

2017-01-02T16:48:47+00:00

This patch does not change any functionality.

Fixes: e34cbd307477 ("blk-wbt: add general throttling mechanism")
Signed-off-by: Bart Van Assche 
Signed-off-by: Jens Axboe

block: Make wbt_wait() definition consistent with declaration

2017-01-02T16:46:15+00:00

Fixes: e34cbd307477 ("blk-wbt: add general throttling mechanism")
Signed-off-by: Bart Van Assche 
Signed-off-by: Jens Axboe

blk-wbt: don't throttle discard or write zeroes

2016-12-09T15:29:35+00:00

Both of these are metadata only commands that are not issued by the
writeback code and not directly relevant to the writeback bandwith.

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

block: add support for REQ_OP_WRITE_ZEROES

2016-12-01T14:58:40+00:00

This adds a new block layer operation to zero out a range of
LBAs. This allows to implement zeroing for devices that don't use
either discard with a predictable zero pattern or WRITE SAME of zeroes.
The prominent example of that is NVMe with the Write Zeroes command,
but in the future, this should also help with improving the way
zeroing discards work. For this operation, suitable entry is exported in
sysfs which indicate the number of maximum bytes allowed in one
write zeroes operation by the device.

Signed-off-by: Chaitanya Kulkarni 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

blk-wbt: allow wbt to be enabled always through sysfs

2016-11-28T17:27:03+00:00

Currently there's no way to enable wbt if it's not enabled in the
kernel config by default for a device. Allow a write to the
'wbt_lat_usec' queue sysfs file to enable wbt.

This is useful for both the kernel config case, but also if the
device is CFQ managed and it was turned off by default.

Signed-off-by: Jens Axboe

blk-wbt: cleanup disable-by-default for CFQ

2016-11-28T17:27:03+00:00

Make it clear that we are disabling wbt for the specified queued,
if it was enabled by default. This is in preparation for allowing
users to re-enable wbt, and not have it disabled automatically
again.

Signed-off-by: Jens Axboe

blk-wbt: allow reset of default latency through sysfs

2016-11-28T17:27:03+00:00

Allow a write of '-1' to reset the default latency target for
a given device. This removes knowledge of the different default
settings for rotational vs non-rotational from user space.

Signed-off-by: Jens Axboe

blk-wbt: fix old-style function declaration

2016-11-16T15:32:40+00:00

The newly added driver causes a harmless warning in some configurations:

block/blk-wbt.c:250:1: error: ‘inline’ is not at beginning of declaration [-Werror=old-style-declaration]
 static bool inline stat_sample_valid(struct blk_rq_stat *stat)

This makes it use the expected format for the declaration.

Signed-off-by: Arnd Bergmann 
Signed-off-by: Jens Axboe

blk-wbt: use BLK_STAT_{READ,WRITE} instead of 0/1

2016-11-11T23:18:29+00:00

Since we have proper enums for the stats directions, use them.

Signed-off-by: Jens Axboe

blk-wbt: remove stat ops

2016-11-11T23:18:24+00:00

Again a leftover from when the throttling code was generic. Now that we
just have the block user, get rid of the stat ops and indirections.

Signed-off-by: Jens Axboe