Commit 80201fe1 authored Mar 08, 2019 by Linus Torvalds

linux-block

Pull block layer updates from Jens Axboe:
 "Not a huge amount of changes in this round, the biggest one is that we
  finally have Mings multi-page bvec support merged. Apart from that,
  this pull request contains:

   - Small series that avoids quiescing the queue for sysfs changes that
     match what we currently have (Aleksei)

   - Series of bcache fixes (via Coly)

   - Series of lightnvm fixes (via Mathias)

   - NVMe pull request from Christoph. Nothing major, just SPDX/license
     cleanups, RR mp policy (Hannes), and little fixes (Bart,
     Chaitanya).

   - BFQ series (Paolo)

   - Save blk-mq cpu -> hw queue mapping, removing a pointer indirection
     for the fast path (Jianchao)

   - fops->iopoll() added for async IO polling, this is a feature that
     the upcoming io_uring interface will use (Christoph, me)

   - Partition scan loop fixes (Dongli)

   - mtip32xx conversion from managed resource API (Christoph)

   - cdrom registration race fix (Guenter)

   - MD pull from Song, two minor fixes.

   - Various documentation fixes (Marcos)

   - Multi-page bvec feature. This brings a lot of nice improvements
     with it, like more efficient splitting, larger IOs can be supported
     without growing the bvec table size, and so on. (Ming)

   - Various little fixes to core and drivers"

* tag 'for-5.1/block-20190302' of git://git.kernel.dk/linux-block: (117 commits)
  block: fix updating bio's front segment size
  block: Replace function name in string with __func__
  nbd: propagate genlmsg_reply return code
  floppy: remove set but not used variable 'q'
  null_blk: fix checking for REQ_FUA
  block: fix NULL pointer dereference in register_disk
  fs: fix guard_bio_eod to check for real EOD errors
  blk-mq: use HCTX_TYPE_DEFAULT but not 0 to index blk_mq_tag_set->map
  block: optimize bvec iteration in bvec_iter_advance
  block: introduce mp_bvec_for_each_page() for iterating over page
  block: optimize blk_bio_segment_split for single-page bvec
  block: optimize __blk_segment_map_sg() for single-page bvec
  block: introduce bvec_nth_page()
  iomap: wire up the iopoll method
  block: add bio_set_polled() helper
  block: wire up block device iopoll method
  fs: add an iopoll method to struct file_operations
  loop: set GENHD_FL_NO_PART_SCAN after blkdev_reread_part()
  loop: do not print warn message if partition scan is successful
  block: bounce: make sure that bvec table is updated
  ...

parents 4221b807 aaeee62c

Documentation/block/biovecs.txt

+25 −0

Original line number	Diff line number	Diff line
		@@ -117,3 +117,28 @@ Other implications:
		size limitations and the limitations of the underlying devices. Thus
		there's no need to define ->merge_bvec_fn() callbacks for individual block
		drivers.

		Usage of helpers:
		=================

		* The following helpers whose names have the suffix of "_all" can only be used
		on non-BIO_CLONED bio. They are usually used by filesystem code. Drivers
		shouldn't use them because the bio may have been split before it reached the
		driver.

		bio_for_each_segment_all()
		bio_first_bvec_all()
		bio_first_page_all()
		bio_last_bvec_all()

		* The following helpers iterate over single-page segment. The passed 'struct
		bio_vec' will contain a single-page IO vector during the iteration

		bio_for_each_segment()
		bio_for_each_segment_all()

		* The following helpers iterate over multi-page bvec. The passed 'struct
		bio_vec' will contain a multi-page IO vector during the iteration

		bio_for_each_bvec()
		rq_for_each_bvec()

Documentation/filesystems/vfs.txt

+3 −0

Original line number	Diff line number	Diff line
		@@ -857,6 +857,7 @@ struct file_operations {
		ssize_t (write) (struct file , const char __user , size_t, loff_t );
		ssize_t (read_iter) (struct kiocb , struct iov_iter *);
		ssize_t (write_iter) (struct kiocb , struct iov_iter *);
		int (iopoll)(struct kiocb kiocb, bool spin);
		int (iterate) (struct file , struct dir_context *);
		int (iterate_shared) (struct file , struct dir_context *);
		__poll_t (poll) (struct file , struct poll_table_struct *);
		@@ -902,6 +903,8 @@ otherwise noted.

		write_iter: possibly asynchronous write with iov_iter as source

		iopoll: called when aio wants to poll for completions on HIPRI iocbs

		iterate: called when the VFS needs to read the directory contents

		iterate_shared: called when the VFS needs to read the directory contents

block/bfq-iosched.c

+380 −325

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block/bfq-iosched.h

+8 −3

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block/bfq-wf2q.c

+12 −6

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