linux-toradex.git/include/linux/bio.h, branch v5.12-rc7

block: rename BIO_MAX_PAGES to BIO_MAX_VECS

2021-03-11T14:47:48+00:00

Ever since the addition of multipage bio_vecs BIO_MAX_PAGES has been
horribly confusingly misnamed.  Rename it to BIO_MAX_VECS to stop
confusing users of the bio API.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Matthew Wilcox (Oracle) 
Reviewed-by: Martin K. Petersen 
Link: https://lore.kernel.org/r/20210311110137.1132391-2-hch@lst.de
Signed-off-by: Jens Axboe

block: Add bio_max_segs

2021-02-26T22:49:51+00:00

It's often inconvenient to use BIO_MAX_PAGES due to min() requiring the
sign to be the same.  Introduce bio_max_segs() and change BIO_MAX_PAGES to
be unsigned to make it easier for the users.

Reviewed-by: Chaitanya Kulkarni 
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Jens Axboe

Merge tag 'for-5.12/block-2021-02-17' of git://git.kernel.dk/linux-block

2021-02-21T19:02:48+00:00

Pull core block updates from Jens Axboe:
 "Another nice round of removing more code than what is added, mostly
  due to Christoph's relentless pursuit of tech debt removal/cleanups.
  This pull request contains:

   - Two series of BFQ improvements (Paolo, Jan, Jia)

   - Block iov_iter improvements (Pavel)

   - bsg error path fix (Pan)

   - blk-mq scheduler improvements (Jan)

   - -EBUSY discard fix (Jan)

   - bvec allocation improvements (Ming, Christoph)

   - bio allocation and init improvements (Christoph)

   - Store bdev pointer in bio instead of gendisk + partno (Christoph)

   - Block trace point cleanups (Christoph)

   - hard read-only vs read-only split (Christoph)

   - Block based swap cleanups (Christoph)

   - Zoned write granularity support (Damien)

   - Various fixes/tweaks (Chunguang, Guoqing, Lei, Lukas, Huhai)"

* tag 'for-5.12/block-2021-02-17' of git://git.kernel.dk/linux-block: (104 commits)
  mm: simplify swapdev_block
  sd_zbc: clear zone resources for non-zoned case
  block: introduce blk_queue_clear_zone_settings()
  zonefs: use zone write granularity as block size
  block: introduce zone_write_granularity limit
  block: use blk_queue_set_zoned in add_partition()
  nullb: use blk_queue_set_zoned() to setup zoned devices
  nvme: cleanup zone information initialization
  block: document zone_append_max_bytes attribute
  block: use bi_max_vecs to find the bvec pool
  md/raid10: remove dead code in reshape_request
  block: mark the bio as cloned in bio_iov_bvec_set
  block: set BIO_NO_PAGE_REF in bio_iov_bvec_set
  block: remove a layer of indentation in bio_iov_iter_get_pages
  block: turn the nr_iovecs argument to bio_alloc* into an unsigned short
  block: remove the 1 and 4 vec bvec_slabs entries
  block: streamline bvec_alloc
  block: factor out a bvec_alloc_gfp helper
  block: move struct biovec_slab to bio.c
  block: reuse BIO_INLINE_VECS for integrity bvecs
  ...

block: add bio_add_zone_append_page

2021-02-08T23:52:19+00:00

Add bio_add_zone_append_page(), a wrapper around bio_add_hw_page() which
is intended to be used by file systems that directly add pages to a bio
instead of using bio_iov_iter_get_pages().

Reviewed-by: Christoph Hellwig 
Reviewed-by: Josef Bacik 
Reviewed-by: Chaitanya Kulkarni 
Acked-by: Jens Axboe 
Signed-off-by: Johannes Thumshirn 
Signed-off-by: David Sterba

block: use bi_max_vecs to find the bvec pool

2021-02-08T15:33:16+00:00

Instead of encoding of the bvec pool using magic bio flags, just use
a helper to find the pool based on the max_vecs value.

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

block: turn the nr_iovecs argument to bio_alloc* into an unsigned short

2021-02-08T15:33:16+00:00

The bi_max_vecs and bi_vcnt fields are defined as unsigned short, so
don't allow passing larger values in.

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

block: move struct biovec_slab to bio.c

2021-02-08T15:33:16+00:00

struct biovec_slab is only used inside of bio.c, so move it there.

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

block: split bio_kmalloc from bio_alloc_bioset

2021-01-27T16:51:48+00:00

bio_kmalloc shares almost no logic with the bio_set based fast path
in bio_alloc_bioset.  Split it into an entirely separate implementation.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Reviewed-by: Chaitanya Kulkarni 
Acked-by: Damien Le Moal 
Signed-off-by: Jens Axboe

bio: don't copy bvec for direct IO

2021-01-25T15:58:24+00:00

The block layer spends quite a while in blkdev_direct_IO() to copy and
initialise bio's bvec. However, if we've already got a bvec in the input
iterator it might be reused in some cases, i.e. when new
ITER_BVEC_FLAG_FIXED flag is set. Simple tests show considerable
performance boost, and it also reduces memory footprint.

Suggested-by: Matthew Wilcox 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Pavel Begunkov 
Reviewed-by: Ming Lei 
Signed-off-by: Jens Axboe

bio: add a helper calculating nr segments to alloc

2021-01-25T15:58:24+00:00

Add a helper function calculating the number of bvec segments we need to
allocate to construct a bio. It doesn't change anything functionally,
but will be used to not duplicate special cases in the future.

Reviewed-by: Christoph Hellwig 
Signed-off-by: Pavel Begunkov 
Reviewed-by: Ming Lei 
Signed-off-by: Jens Axboe