linux-stable.git/block/blk-exec.c, branch v4.11.2

block: introduce blk_rq_is_passthrough

2017-01-31T21:00:34+00:00

This can be used to check for fs vs non-fs requests and basically
removes all knowledge of BLOCK_PC specific from the block layer,
as well as preparing for removing the cmd_type field in struct request.

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

block: split scsi_request out of struct request

2017-01-27T22:08:35+00:00

And require all drivers that want to support BLOCK_PC to allocate it
as the first thing of their private data.  To support this the legacy
IDE and BSG code is switched to set cmd_size on their queues to let
the block layer allocate the additional space.

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

blk-mq-sched: add flush insertion into blk_mq_sched_insert_request()

2017-01-27T16:03:14+00:00

Instead of letting the caller check this and handle the details
of inserting a flush request, put the logic in the scheduler
insertion function. This fixes direct flush insertion outside
of the usual make_request_fn calls, like from dm via
blk_insert_cloned_request().

Signed-off-by: Jens Axboe

blk-mq-sched: add framework for MQ capable IO schedulers

2017-01-17T17:04:20+00:00

This adds a set of hooks that intercepts the blk-mq path of
allocating/inserting/issuing/completing requests, allowing
us to develop a scheduler within that framework.

We reuse the existing elevator scheduler API on the registration
side, but augment that with the scheduler flagging support for
the blk-mq interfce, and with a separate set of ops hooks for MQ
devices.

We split driver and scheduler tags, so we can run the scheduling
independently of device queue depth.

Signed-off-by: Jens Axboe 
Reviewed-by: Bart Van Assche 
Reviewed-by: Omar Sandoval

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

block: Fix spelling in a source code comment

2016-07-21T03:28:22+00:00

Signed-off-by: Bart Van Assche 
Cc: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: move PM request support to IDE

2015-05-05T19:40:42+00:00

This removes the request types and hacks from the block code and into the
old IDE driver.  There is a small amunt of code duplication due to this,
but it's not too bad.

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

blk-mq: avoid infinite recursion with the FUA flag

2014-09-22T17:55:19+00:00

We should not insert requests into the flush state machine from
blk_mq_insert_request.  All incoming flush requests come through
blk_{m,s}q_make_request and are handled there, while blk_execute_rq_nowait
should only be called for BLOCK_PC requests.  All other callers
deal with requests that already went through the flush statemchine
and shouldn't be reinserted into it.

Reported-by: Robert Elliott  
Debugged-by: Ming Lei 
Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: blk-exec.c: Cleaning up local variable address returnd

2014-06-09T01:51:31+00:00

Address of local variable assigned to a function parameter

This was partly found using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist 
Signed-off-by: Jens Axboe

blk-mq: merge blk_mq_insert_request and blk_mq_run_request

2014-02-21T16:58:48+00:00

It's almost identical to blk_mq_insert_request, so fold the two into one
slightly more generic function by making the flush special case a bit
smarted.

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