kernel/block/blk-exec.c, branch linux-5.10.y

block: add a blk_account_io_merge_bio helper

2020-05-27T11:21:23Z

Move the non-"new_io" branch of blk_account_io_start() into separate function. Fix merge accounting for discards (they were counted as write merges). The new blk_account_io_merge_bio() doesn't call update_io_ticks() unlike blk_account_io_start(), as there is no reason for that. [hch: rebased] Signed-off-by: Konstantin Khlebnikov Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: account statistics for passthrough requests

2019-10-10T23:52:31Z

Presently, passthrough requests are not accounted for because blk_do_io_stat() expressly rejects them. Based on some digging in the history, this doesn't seem like a concious decision but one that evolved from the change from blk_fs_request() to blk_rq_is_passthrough(). To support this, call blk_account_io_start() in blk_execute_rq_nowait() and remove the passthrough check in blk_do_io_stat(). Link: https://lore.kernel.org/linux-block/20191010100526.GA27209@lst.de/ Signed-off-by: Logan Gunthorpe Cc: Jens Axboe Cc: Christoph Hellwig Signed-off-by: Jens Axboe

block: add SPDX tags to block layer files missing licensing information

2019-04-30T22:12:03Z

Various block layer files do not have any licensing information at all. Add SPDX tags for the default kernel GPLv2 license to those. Reviewed-by: Chaitanya Kulkarni Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: remove dead elevator code

2018-11-07T20:42:32Z

This removes a bunch of core and elevator related code. On the core front, we remove anything related to queue running, draining, initialization, plugging, and congestions. We also kill anything related to request allocation, merging, retrieval, and completion. Remove any checking for single queue IO schedulers, as they no longer exist. This means we can also delete a bunch of code related to request issue, adding, completion, etc - and all the SQ related ops and helpers. Also kill the load_default_modules(), as all that did was provide for a way to load the default single queue elevator. Tested-by: Ming Lei Reviewed-by: Omar Sandoval Signed-off-by: Jens Axboe

blk-mq-sched: remove unused 'can_block' arg from blk_mq_sched_insert_request

2018-01-17T16:49:21Z

After commit: 923218f6166a ("blk-mq: don't allocate driver tag upfront for flush rq") we no longer use the 'can_block' argument in blk_mq_sched_insert_request(). Kill it. Signed-off-by: Mike Snitzer Added actual commit message as to why it's being removed. Signed-off-by: Jens Axboe

block: introduce new block status code type

2017-06-09T15:27:32Z

Currently we use nornal Linux errno values in the block layer, and while we accept any error a few have overloaded magic meanings. This patch instead introduces a new blk_status_t value that holds block layer specific status codes and explicitly explains their meaning. Helpers to convert from and to the previous special meanings are provided for now, but I suspect we want to get rid of them in the long run - those drivers that have a errno input (e.g. networking) usually get errnos that don't know about the special block layer overloads, and similarly returning them to userspace will usually return somethings that strictly speaking isn't correct for file system operations, but that's left as an exercise for later. For now the set of errors is a very limited set that closely corresponds to the previous overloaded errno values, but there is some low hanging fruite to improve it. blk_status_t (ab)uses the sparse __bitwise annotations to allow for sparse typechecking, so that we can easily catch places passing the wrong values. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: remove the errors field from struct request

2017-04-20T18:16:10Z

Signed-off-by: Christoph Hellwig Reviewed-by: Bart Van Assche Acked-by: Roger Pau Monné Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Jens Axboe

block: remove the blk_execute_rq return value

2017-04-20T18:16:10Z

The function only returns -EIO if rq->errors is non-zero, which is not very useful and lets a large number of callers ignore the return value. Just let the callers figure out their error themselves. Signed-off-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Reviewed-by: Bart Van Assche Signed-off-by: Jens Axboe

block: introduce blk_rq_is_passthrough

2017-01-31T21:00:34Z

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

2017-01-27T22:08:35Z

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