| Age | Commit message (Collapse) | Author |
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Pull block updates from Jens Axboe:
- NVMe updates via Keith:
- Device initialization memory leak fixes (Keith)
- More constants defined (Weiwen)
- Target debugfs support (Hannes)
- PCIe subsystem reset enhancements (Keith)
- Queue-depth multipath policy (Redhat and PureStorage)
- Implement get_unique_id (Christoph)
- Authentication error fixes (Gaosheng)
- MD updates via Song
- sync_action fix and refactoring (Yu Kuai)
- Various small fixes (Christoph Hellwig, Li Nan, and Ofir Gal, Yu
Kuai, Benjamin Marzinski, Christophe JAILLET, Yang Li)
- Fix loop detach/open race (Gulam)
- Fix lower control limit for blk-throttle (Yu)
- Add module descriptions to various drivers (Jeff)
- Add support for atomic writes for block devices, and statx reporting
for same. Includes SCSI and NVMe (John, Prasad, Alan)
- Add IO priority information to block trace points (Dongliang)
- Various zone improvements and tweaks (Damien)
- mq-deadline tag reservation improvements (Bart)
- Ignore direct reclaim swap writes in writeback throttling (Baokun)
- Block integrity improvements and fixes (Anuj)
- Add basic support for rust based block drivers. Has a dummy null_blk
variant for now (Andreas)
- Series converting driver settings to queue limits, and cleanups and
fixes related to that (Christoph)
- Cleanup for poking too deeply into the bvec internals, in preparation
for DMA mapping API changes (Christoph)
- Various minor tweaks and fixes (Jiapeng, John, Kanchan, Mikulas,
Ming, Zhu, Damien, Christophe, Chaitanya)
* tag 'for-6.11/block-20240710' of git://git.kernel.dk/linux: (206 commits)
floppy: add missing MODULE_DESCRIPTION() macro
loop: add missing MODULE_DESCRIPTION() macro
ublk_drv: add missing MODULE_DESCRIPTION() macro
xen/blkback: add missing MODULE_DESCRIPTION() macro
block/rnbd: Constify struct kobj_type
block: take offset into account in blk_bvec_map_sg again
block: fix get_max_segment_size() warning
loop: Don't bother validating blocksize
virtio_blk: Don't bother validating blocksize
null_blk: Don't bother validating blocksize
block: Validate logical block size in blk_validate_limits()
virtio_blk: Fix default logical block size fallback
nvmet-auth: fix nvmet_auth hash error handling
nvme: implement ->get_unique_id
block: pass a phys_addr_t to get_max_segment_size
block: add a bvec_phys helper
blk-lib: check for kill signal in ioctl BLKZEROOUT
block: limit the Write Zeroes to manually writing zeroes fallback
block: refacto blkdev_issue_zeroout
block: move read-only and supported checks into (__)blkdev_issue_zeroout
...
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The rebase of commit 09595e0c9d65 ("block: pass a phys_addr_t to
get_max_segment_size") lost adding the total to to the offset in
blk_bvec_map_sg. Add it back.
Fixes: 09595e0c9d65 ("block: pass a phys_addr_t to get_max_segment_size")
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Reported-by: Chaitanya Kulkarni <chaitanyak@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240709070126.3019940-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Correct the parameter name in the comment of get_max_segment_size()
to fix following warning:-
block/blk-merge.c:220: warning: Function parameter or struct member 'len' not described in 'get_max_segment_size'
block/blk-merge.c:220: warning: Excess function parameter 'max_len' description in 'get_max_segment_size'
Signed-off-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240709045432.8688-1-kch@nvidia.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Some drivers validate that their own logical block size. It is no harm to
always do this, so validate in blk_validate_limits().
This allows us to remove the validation in most of those drivers.
Add a comment to blk_validate_block_size() to inform users that self-
validation of LBS is usually unnecessary.
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240708091651.177447-3-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Work on a single address to simplify the logic, and prepare the callers
from using better helpers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20240706075228.2350978-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Get callers out of poking into bvec internals a bit more. Not a huge win
right now, but with the proposed new DMA mapping API we might end up with
a lot more of this otherwise.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20240706075228.2350978-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Zeroout can access a significant capacity and take longer than the user
expected. A user may change their mind about wanting to run that
command and attempt to kill the process and do something else with their
device. But since the task is uninterruptable, they have to wait for it
to finish, which could be many hours.
Add a new BLKDEV_ZERO_KILLABLE flag for blkdev_issue_zeroout that checks
for a fatal signal at each iteration so the user doesn't have to wait for
their regretted operation to complete naturally.
Heavily based on an earlier patch from Keith Busch.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-11-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Only fall back from hardware Write Zeroes failures when
blkdev_issue_write_zeroes returns -EOPNOTSUPP;
Note that blkdev_issue_write_zeroes turns any failure into -EOPNOTSUPP
when the write zeroes queue limit has been cleared to 0, so this still
catches all I/O errors where the driver detected missing support
for the hardware acceleration.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Split out two well-defined helpers for hardware supported Write Zeroes
and manually writing zeroes using the Write command.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Move these checks out of the lower level helpers and into the higher level
ones to prepare for refactoring.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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__blkdev_issue_zeroout is a purely kernel internal API and thus can rely
on the block layer sector alignment checks.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Contrary to the comment in __blkdev_issue_write_zeroes, nothing here
checks for a potential bi_size overflow. Add a helper mirroring
the secure erase code for the check.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240701165219.1571322-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Remove the helper function blk_alloc_zone_bitmap() and replace its
single call site with a call to bitmap_alloc(). To be consistent with
this change, use bitmap_free() to free a disk convnetional zone bitmap.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240704052816.623865-6-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Now that device mapper can handle resetting all zones of a mapped zoned
device using REQ_OP_ZONE_RESET_ALL, all zoned block device drivers
support this operation. With this, the request queue feature
BLK_FEAT_ZONE_RESETALL is not necessary and the emulation code in
blk-zone.c can be removed.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240704052816.623865-5-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Modify bio_integrity_clone to reuse the original bvec array instead of
allocating and copying it, similar to how bio data path is cloned.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240702100753.2168-1-anuj20.g@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The current tag reservation code is based on a misunderstanding of the
meaning of data->shallow_depth. Fix the tag reservation code as follows:
* By default, do not reserve any tags for synchronous requests because
for certain use cases reserving tags reduces performance. See also
Harshit Mogalapalli, [bug-report] Performance regression with fio
sequential-write on a multipath setup, 2024-03-07
(https://lore.kernel.org/linux-block/5ce2ae5d-61e2-4ede-ad55-551112602401@oracle.com/)
* Reduce min_shallow_depth to one because min_shallow_depth must be less
than or equal any shallow_depth value.
* Scale dd->async_depth from the range [1, nr_requests] to [1,
bits_per_sbitmap_word].
Cc: Christoph Hellwig <hch@lst.de>
Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: Zhiguo Niu <zhiguo.niu@unisoc.com>
Fixes: 07757588e507 ("block/mq-deadline: Reserve 25% of scheduler tags for synchronous requests")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240509170149.7639-3-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Call .limit_depth() after data->hctx has been set such that data->hctx can
be used in .limit_depth() implementations.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: Zhiguo Niu <zhiguo.niu@unisoc.com>
Fixes: 07757588e507 ("block/mq-deadline: Reserve 25% of scheduler tags for synchronous requests")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240509170149.7639-2-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Don't reduce the max_sectors value below the normal cap when the driver
advertsizes a very low io_opt. This restores the behavior we had before
the recent changes to the max_sectors calculation.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240701051800.1245240-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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If io_min is larger than the cap, it must by definition be non-zero.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240701051800.1245240-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Now we avoid throttling swap writes by determining whether the current
process is kswapd (aka current_is_kswapd()), but swap writes can come
from either kswapd or direct reclaim, so the swap writes from direct
reclaim will still be throttled.
When a process holds a lock to allocate a free page, and enters direct
reclaim because there is no free memory, then it might trigger a hung
due to the wbt throttling that causes other processes to fail to get
the lock.
Both kswapd and direct reclaim set the REQ_SWAP flag, so use REQ_SWAP
instead of current_is_kswapd() to avoid throttling swap writes. Also
renamed WBT_KSWAPD to WBT_SWAP and WBT_RWQ_KSWAPD to WBT_RWQ_SWAP.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240604030522.3686177-1-libaokun@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The kobject for the queue entries is embedded into a struct gendisk.
Pass it to the sysfs methods instead of the request_queue derived from
it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240627111407.476276-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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A lof the code to implement the queue sysfs attributes is repetitive.
Add a few macros to generate the common cases.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240627111407.476276-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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User will configure allowed iops limit in 1s, and calculate_io_allowed()
will calculate allowed iops in the slice by:
limit * HZ / throtl_slice
However, if limit is quite low, the result can be 0, then
allowed IO in the slice is 0, this will cause missing dispatch and
control will be lower than limit.
For example, set iops_limit to 5 with HD disk, and test will found that
iops will be 3.
This is usually not a big deal, because user will unlikely to configure
such low iops limit, however, this is still a problem in the extreme
scene.
Fix the problem by making sure the wait time calculated by
tg_within_iops_limit() should allow at least one IO to be dispatched.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240618062108.3680835-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Set the bip_vcnt correctly in bio_integrity_init_user and
bio_integrity_copy_user. If the bio gets split at a later point,
this value is required to set the right bip_vcnt in the cloned bio.
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240626100700.3629-3-anuj20.g@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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IO logical block size is one fundamental queue limit, and every IO has
to be aligned with logical block size because our bio split can't deal
with unaligned bio.
The check has to be done with queue usage counter grabbed because device
reconfiguration may change logical block size, and we can prevent the
reconfiguration from happening by holding queue usage counter.
logical_block_size stays in the 1st cache line of queue_limits, and this
cache line is always fetched in fast path via bio_may_exceed_limits(),
so IO perf won't be affected by this check.
Cc: Yi Zhang <yi.zhang@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ye Bin <yebin10@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240620030631.3114026-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Move the bvec interation into the generate/verify helpers to avoid a bit
of argument passing churn.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240626045950.189758-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Use a single switch to perform read and write specific checks and exit
early for other operations instead of having two checks using different
predicates.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240626045950.189758-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Allocation failures already leave a stack trace, so don't spew another
warning.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240626045950.189758-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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bio_integrity_add_page can add physically contiguous regions of any size,
so don't bother chunking up the kmalloced buffer.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240626045950.189758-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The PI generation helpers already zero the app tag, so relax the zeroing
to non-PI metadata.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240626045950.189758-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Since commit 70200574cc22 ("block: remove QUEUE_FLAG_DISCARD"),
blk_queue_flag_test_and_set() has not been used, so delete it.
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240627160735.842189-1-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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It is odd to check the offset amidst a series of assignments. Moving this
check to the beginning of the function makes the code look better.
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240625115517.1472120-1-linan666@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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dma_pad_mask is a queue_limits by all ways of looking at it, so move it
there and set it through the atomic queue limits APIs.
Add a little helper that takes the alignment and pad into account to
simplify the code that is touched a bit.
Note that there never was any need for the > check in
blk_queue_update_dma_pad, this probably was just copy and paste from
dma_update_dma_alignment.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240626142637.300624-9-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Mark blk_apply_bdi_limits non-static and open code disk_update_readahead
in the only caller.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240626142637.300624-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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"static" never goes on a line of its own.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240626142637.300624-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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... and let sparse help us catch mismatches or abuses.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240626142637.300624-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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This is a flag for ->flags and not a feature for ->features. And fix the
one place that actually incorrectly cleared it from ->features.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240626142637.300624-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Check the features flag and the override flag using the
blk_queue_write_cache, helper otherwise we're going to always
report "write through".
Fixes: 1122c0c1cc71 ("block: move cache control settings out of queue->flags")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240626142637.300624-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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For arm32, we get the following build warning:
In file included from /tmp/next/build/include/linux/printk.h:10,
from /tmp/next/build/include/linux/kernel.h:31,
from /tmp/next/build/block/blk-settings.c:5:
/tmp/next/build/block/blk-settings.c: In function 'blk_validate_atomic_write_limits':
/tmp/next/build/include/asm-generic/div64.h:222:35: warning: comparison of distinct pointer types lacks a cast
222 | (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
| ^~
The divident for do_div() should be 64b, which it is not. Since we want to
check 2x unsigned ints, just use % operator. This allows us to drop the
chunk_sectors variable.
Fixes: 9da3d1e912f3 ("block: Add core atomic write support")
Reported-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/linux-next/b765d200-4e0f-48b1-a962-7dfa1c4aef9c@kernel.dk/T/#mbf067b1edd89c7f9d7dac6e258c516199953a108
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20240621183016.3092518-1-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There is no need for bdev_nr_zones() to be an exported function
calculating the number of zones of a block device. Instead, given that
all callers use this helper with a fully initialized block device that
has a gendisk, we can redefine this function as an inline helper in
blkdev.h.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240621031506.759397-3-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Support atomic writes by submitting a single BIO with the REQ_ATOMIC set.
It must be ensured that the atomic write adheres to its rules, like
naturally aligned offset, so call blkdev_dio_invalid() ->
blkdev_atomic_write_valid() [with renaming blkdev_dio_unaligned() to
blkdev_dio_invalid()] for this purpose. The BIO submission path currently
checks for atomic writes which are too large, so no need to check here.
In blkdev_direct_IO(), if the nr_pages exceeds BIO_MAX_VECS, then we cannot
produce a single BIO, so error in this case.
Finally set FMODE_CAN_ATOMIC_WRITE when the bdev can support atomic writes
and the associated file flag is for O_DIRECT.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-8-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Extend statx system call to return additional info for atomic write support
support if the specified file is a block device.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Prasad Singamsetty <prasad.singamsetty@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-7-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Add atomic write support, as follows:
- add helper functions to get request_queue atomic write limits
- report request_queue atomic write support limits to sysfs and update Doc
- support to safely merge atomic writes
- deal with splitting atomic writes
- misc helper functions
- add a per-request atomic write flag
New request_queue limits are added, as follows:
- atomic_write_hw_max is set by the block driver and is the maximum length
of an atomic write which the device may support. It is not
necessarily a power-of-2.
- atomic_write_max_sectors is derived from atomic_write_hw_max_sectors and
max_hw_sectors. It is always a power-of-2. Atomic writes may be merged,
and atomic_write_max_sectors would be the limit on a merged atomic write
request size. This value is not capped at max_sectors, as the value in
max_sectors can be controlled from userspace, and it would only cause
trouble if userspace could limit atomic_write_unit_max_bytes and the
other atomic write limits.
- atomic_write_hw_unit_{min,max} are set by the block driver and are the
min/max length of an atomic write unit which the device may support. They
both must be a power-of-2. Typically atomic_write_hw_unit_max will hold
the same value as atomic_write_hw_max.
- atomic_write_unit_{min,max} are derived from
atomic_write_hw_unit_{min,max}, max_hw_sectors, and block core limits.
Both min and max values must be a power-of-2.
- atomic_write_hw_boundary is set by the block driver. If non-zero, it
indicates an LBA space boundary at which an atomic write straddles no
longer is atomically executed by the disk. The value must be a
power-of-2. Note that it would be acceptable to enforce a rule that
atomic_write_hw_boundary_sectors is a multiple of
atomic_write_hw_unit_max, but the resultant code would be more
complicated.
All atomic writes limits are by default set 0 to indicate no atomic write
support. Even though it is assumed by Linux that a logical block can always
be atomically written, we ignore this as it is not of particular interest.
Stacked devices are just not supported either for now.
An atomic write must always be submitted to the block driver as part of a
single request. As such, only a single BIO must be submitted to the block
layer for an atomic write. When a single atomic write BIO is submitted, it
cannot be split. As such, atomic_write_unit_{max, min}_bytes are limited
by the maximum guaranteed BIO size which will not be required to be split.
This max size is calculated by request_queue max segments and the number
of bvecs a BIO can fit, BIO_MAX_VECS. Currently we rely on userspace
issuing a write with iovcnt=1 for pwritev2() - as such, we can rely on each
segment containing PAGE_SIZE of data, apart from the first+last, which each
can fit logical block size of data. The first+last will be LBS
length/aligned as we rely on direct IO alignment rules also.
New sysfs files are added to report the following atomic write limits:
- atomic_write_unit_max_bytes - same as atomic_write_unit_max_sectors in
bytes
- atomic_write_unit_min_bytes - same as atomic_write_unit_min_sectors in
bytes
- atomic_write_boundary_bytes - same as atomic_write_hw_boundary_sectors in
bytes
- atomic_write_max_bytes - same as atomic_write_max_sectors in bytes
Atomic writes may only be merged with other atomic writes and only under
the following conditions:
- total resultant request length <= atomic_write_max_bytes
- the merged write does not straddle a boundary
Helper function bdev_can_atomic_write() is added to indicate whether
atomic writes may be issued to a bdev. If a bdev is a partition, the
partition start must be aligned with both atomic_write_unit_min_sectors
and atomic_write_hw_boundary_sectors.
FSes will rely on the block layer to validate that an atomic write BIO
submitted will be of valid size, so add blk_validate_atomic_write_op_size()
for this purpose. Userspace expects an atomic write which is of invalid
size to be rejected with -EINVAL, so add BLK_STS_INVAL for this. Also use
BLK_STS_INVAL for when a BIO needs to be split, as this should mean an
invalid size BIO.
Flag REQ_ATOMIC is used for indicating an atomic write.
Co-developed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-6-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The purpose of the chunk_sectors limit is to ensure that a mergeble request
fits within the boundary of the chunck_sector value.
Such a feature will be useful for other request_queue boundary limits, so
generalize the chunk_sectors merge code.
This idea was proposed by Hannes Reinecke.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-3-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Currently blk_queue_get_max_sectors() is passed a enum req_op. In future
the value returned from blk_queue_get_max_sectors() may depend on certain
request flags, so pass a request pointer.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-2-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Merge in queue limits cleanups.
* for-6.11/block-limits:
block: move the raid_partial_stripes_expensive flag into the features field
block: remove the discard_alignment flag
block: move the misaligned flag into the features field
block: renumber and rename the cache disabled flag
block: fix spelling and grammar for in writeback_cache_control.rst
block: remove the unused blk_bounce enum
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Move the raid_partial_stripes_expensive flags into the features field to
reclaim a little bit of space.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240619154623.450048-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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queue_limits.discard_alignment is never read except in the places
where it is stacked into another limit.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240619154623.450048-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Move the misaligned flags into the features field to reclaim a little
bit of space.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240619154623.450048-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Start with the first bit, and drop the plural-S from the name.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20240619154623.450048-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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