linux-stable.git/include/linux/blk_types.h, branch v4.11.2

block: fold cmd_type into the REQ_OP_ space

2017-01-31T21:00:44+00:00

Instead of keeping two levels of indirection for requests types, fold it
all into the operations.  The little caveat here is that previously
cmd_type only applied to struct request, while the request and bio op
fields were set to plain REQ_OP_READ/WRITE even for passthrough
operations.

Instead this patch adds new REQ_OP_* for SCSI passthrough and driver
private requests, althought it has to add two for each so that we
can communicate the data in/out nature of the request.

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

block: add a op_is_flush helper

2017-01-27T16:01:45+00:00

This centralizes the checks for bios that needs to be go into the flush
state machine.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Martin K. Petersen 
Reviewed-by: Bart Van Assche 
Signed-off-by: Jens Axboe

blk-mq: add support for carrying internal tag information in blk_qc_t

2017-01-17T17:04:09+00:00

No functional change in this patch, just in preparation for having
two types of tags available to the block layer for a single request.

Signed-off-by: Jens Axboe 
Reviewed-by: Omar Sandoval

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

block: clear all of bi_opf in bio_set_op_attrs

2016-11-21T16:35:05+00:00

Since commit 87374179 ("block: add a proper block layer data direction
encoding") we only or the new op and flags into bi_opf in bio_set_op_attrs
instead of clearing the old value.  I've not seen any breakage with the
new behavior, but it seems dangerous.

Also convert it to an inline function to make the argument passing
safer.

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

block: add scalable completion tracking of requests

2016-11-10T20:53:26+00:00

For legacy block, we simply track them in the request queue. For
blk-mq, we track them on a per-sw queue basis, which we can then
sum up through the hardware queues and finally to a per device
state.

The stats are tracked in, roughly, 0.1s interval windows.

Add sysfs files to display the stats.

The feature is off by default, to avoid any extra overhead. In-kernel
users of it can turn it on by setting QUEUE_FLAG_STATS in the queue
flags. We currently don't turn it on if someone just reads any of
the stats files, that is something we could add as well.

Signed-off-by: Jens Axboe

block: add REQ_BACKGROUND

2016-11-02T16:24:01+00:00

This adds a new request flag, REQ_BACKGROUND, that callers can use to
tell the block layer that this is background (non-urgent) IO.

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

block: remove the CONFIG_BLOCK ifdef in blk_types.h

2016-11-01T15:43:26+00:00

Now that we have a separate header for struct bio_vec there is absolutely
no excuse for including this header from non-block I/O code.

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

block: replace REQ_NOIDLE with REQ_IDLE

2016-11-01T15:43:26+00:00

Noidle should be the default for writes as seen by all the compounds
definitions in fs.h using it.  In fact only direct I/O really should
be using NODILE, so turn the whole flag around to get the defaults
right, which will make our life much easier especially onces the
WRITE_* defines go away.

This assumes all the existing "raw" users of REQ_SYNC for writes
want noidle behavior, which seems to be spot on from a quick audit.

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

block: treat REQ_FUA and REQ_PREFLUSH as synchronous

2016-11-01T15:43:26+00:00

Instead of requiring everyone to specify the REQ_SYNC flag aѕ well.

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