linux-stable.git/include/linux/blk_types.h, branch v4.10.2

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

block: add a proper block layer data direction encoding

2016-10-28T14:48:54+00:00

Currently the block layer op_is_write, bio_data_dir and rq_data_dir
helper treat every operation that is not a READ as a data out operation.
This worked surprisingly long, but the new REQ_OP_ZONE_REPORT operation
actually adds a second operation that reads data from the device.
Surprisingly nothing critical relied on this direction, but this might
be a good opportunity to properly fix this issue up.

We take a little inspiration and use the least significant bit of the
operation number to encode the data direction, which just requires us
to renumber the operations to fix this scheme.

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

block: better op and flags encoding

2016-10-28T14:48:16+00:00

Now that we don't need the common flags to overflow outside the range
of a 32-bit type we can encode them the same way for both the bio and
request fields.  This in addition allows us to place the operation
first (and make some room for more ops while we're at it) and to
stop having to shift around the operation values.

In addition this allows passing around only one value in the block layer
instead of two (and eventuall also in the file systems, but we can do
that later) and thus clean up a lot of code.

Last but not least this allows decreasing the size of the cmd_flags
field in struct request to 32-bits.  Various functions passing this
value could also be updated, but I'd like to avoid the churn for now.

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

block: split out request-only flags into a new namespace

2016-10-28T14:45:17+00:00

A lot of the REQ_* flags are only used on struct requests, and only of
use to the block layer and a few drivers that dig into struct request
internals.

This patch adds a new req_flags_t rq_flags field to struct request for
them, and thus dramatically shrinks the number of common requests.  It
also removes the unfortunate situation where we have to fit the fields
from the same enum into 32 bits for struct bio and 64 bits for
struct request.

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