Pass the cgroup_subsys_state instead of a the blkg so that blktrace
doesn't need to poke into blk-cgroup internals, and give the name a
blk prefix as the current name is way too generic for a public
interface.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-9-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

There is no real need to expose the blkcg structure to the whole kernel.
Move it to the private header an expose a helper to let the writeback
code access the cgwb_list member.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-8-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Move these two functions out of line as there is no good reason
to inline them.  Also switch to passing a cgroup_subsys_state
instead of doing the conversion in the caller to prepare for making
the blkcg structure private to blk-cgroup.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-7-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

There is no urgent need to inline this function, so move it out of line.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-6-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

No need to have these helpers inline.  Also remove the stubs and just use
an IS_ENABLED for the get side (the set side already is only built
conditionlly).
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-5-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

No need for this wrapper.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-4-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

nvme-fc appid support needs CONFIG_BLK_CGROUP_FC_APPID to work, so disable
the whole code if the option is not set.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-3-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Remove the unused and deprecated __bio_blkcg helper.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NTejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-2-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

So far bio is marked as REQ_POLLED if RWF_HIPRI/IOCB_HIPRI is passed
from userspace sync io interface, then block layer tries to poll until
the bio is completed. But the current implementation calls
blk_io_schedule() if bio_poll() returns 0, and this way causes io hang or
timeout easily.

But looks no one reports this kind of issue, which should have been
triggered in normal io poll sanity test or blktests block/007 as
observed by Changhui, that means it is very likely that no one uses it
or no one cares it.

Also after io_uring is invented, io poll for sync dio becomes legacy
interface.

So ignore RWF_HIPRI hint for sync dio.

CC: linux-mm@kvack.org
Cc: linux-xfs@vger.kernel.org
Reported-by: NChanghui Zhong <czhong@redhat.com>
Suggested-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NMing Lei <ming.lei@redhat.com>
Tested-by: NChanghui Zhong <czhong@redhat.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220420143110.2679002-1-ming.lei@redhat.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

Get rid of the following redundant assignments:
- to a variable r_cols from function ldm_parse_cmp3
- to variables r_id1 and r_id2 from functions ldm_parse_dgr3 and ldm_parse_dgr4
- to a variable r_index from function ldm_parse_prt3
that end up in values not being read until the end of function.

Reported by clang-tidy [deadcode.DeadStores]
Signed-off-by: NMichal Orzel <michalorzel.eng@gmail.com>
Link: https://lore.kernel.org/r/20220423113811.13335-5-michalorzel.eng@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

Get rid of redundant assignment to a variable part_fmt from function
atari_partition. It is being assigned a value that is never read until
the end of function.

Reported by clang-tidy [deadcode.DeadStores]
Signed-off-by: NMichal Orzel <michalorzel.eng@gmail.com>
Link: https://lore.kernel.org/r/20220423113811.13335-4-michalorzel.eng@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

Get rid of redundant assignments to a variable slot from function
adfspart_check_ADFS. It is being assigned a value that is never read
as we are breaking out from the switch case and the function ends.

Reported by clang-tidy [deadcode.DeadStores]
Signed-off-by: NMichal Orzel <michalorzel.eng@gmail.com>
Link: https://lore.kernel.org/r/20220423113811.13335-3-michalorzel.eng@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

Get rid of redundant assignment to a variable ret from function
bio_map_user_iov as it is being assigned a value that is never read.
It is being re-assigned in the first instruction after the while loop

Reported by clang-tidy [deadcode.DeadStores]
Signed-off-by: NMichal Orzel <michalorzel.eng@gmail.com>
Link: https://lore.kernel.org/r/20220423113811.13335-2-michalorzel.eng@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

Get rid of redundant assignments to a variable sectors from functions
badblocks_check and badblocks_clear. This variable, that is a function
parameter, is being assigned a value that is never read until the end of
function.

Reported by clang-tidy [deadcode.DeadStores]
Signed-off-by: NMichal Orzel <michalorzel.eng@gmail.com>
Link: https://lore.kernel.org/r/20220423113811.13335-1-michalorzel.eng@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>

Export IO accounting interfaces in terms of block_device now that
gendisk has become more internal to block core.

Rename __part_{start,end}_io_acct's first argument from part to bdev.
Rename __part_{start,end}_io_acct to bdev_{start,end}_io_acct and
export them.  Remove disk_{start,end}_io_acct and update caller (zram)
to use bdev_{start,end}_io_acct.

DM can now be updated to use bdev_{start,end}_io_acct.
Signed-off-by: NMing Lei <ming.lei@redhat.com>
Signed-off-by: NMike Snitzer <snitzer@kernel.org>
Link: https://lore.kernel.org/r/20220418022733.56168-2-snitzer@kernel.orgSigned-off-by: NJens Axboe <axboe@kernel.dk>

Randomly poking into block device internals for manual prefetches isn't
exactly a very maintainable thing to do.  And none of the performance
critical direct I/O implementations still use this library function
anyway, so just drop it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Link: https://lore.kernel.org/r/20220415045258.199825-28-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Secure erase is a very different operation from discard in that it is
a data integrity operation vs hint.  Fully split the limits and helper
infrastructure to make the separation more clear.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd]
Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> [nifs2]
Acked-by: Jaegeuk Kim <jaegeuk@kernel.org> [f2fs]
Acked-by: Coly Li <colyli@suse.de> [bcache]
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Acked-by: NChao Yu <chao@kernel.org>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-27-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Abstract away implementation details from file systems by providing a
block_device based helper to retrieve the discard granularity.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd]
Acked-by: NRyusuke Konishi <konishi.ryusuke@gmail.com>
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Link: https://lore.kernel.org/r/20220415045258.199825-26-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Just use a non-zero max_discard_sectors as an indicator for discard
support, similar to what is done for write zeroes.

The only places where needs special attention is the RAID5 driver,
which must clear discard support for security reasons by default,
even if the default stacking rules would allow for it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd]
Acked-by: Jan Höppner <hoeppner@linux.ibm.com> [s390]
Acked-by: Coly Li <colyli@suse.de> [bcache]
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-25-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Add a helper to query the number of sectors support per each discard bio
based on the block device and use this helper to stop various places from
poking into the request_queue to see if discard is supported and if so how
much.  This mirrors what is done e.g. for write zeroes as well.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd]
Acked-by: Coly Li <colyli@suse.de> [bcache]
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-24-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Move all the logic to limit the discard bio size into a common helper
so that it is better documented.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: NColy Li <colyli@suse.de>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-23-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

No need to inline these fairly larger helpers.  Also fix the return value
to be unsigned, just like the field in struct queue_limits.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220415045258.199825-22-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Use the bdev based alignment helper instead of open coding it.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220415045258.199825-21-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Just use bdev_alignment_offset in disk_discard_alignment_show instead.
That helpers is the same except for an always false branch that doesn't
matter in this slow path.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220415045258.199825-20-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

No need to inline these fairly larger helpers.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220415045258.199825-19-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

This does the same as the open coded variant except for an extra branch,
and allows to remove queue_alignment_offset entirely.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20220415045258.199825-18-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Replace the open coded offset calculation with the proper helper.
This is an ABI change in that the -1 for a misaligned partition is
properly propagated, which can be considered a bug fix and matches
what is done on the whole device.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-17-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Add a helper to check the max supported sectors for zone append based on
the block_device instead of having to poke into the block layer internal
request_queue.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-16-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Add a helper to check the stable writes flag based on the block_device
instead of having to poke into the block layer internal request_queue.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-15-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Add a helper to check the FUA flag based on the block_device instead of
having to poke into the block layer internal request_queue.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-14-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Add a helper to check the write cache flag based on the block_device
instead of having to poke into the block layer internal request_queue.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-13-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Add a helper to check the nonrot flag based on the block_device instead
of having to poke into the block layer internal request_queue.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-12-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Use the bdev based helper instead of poking into the queue.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDamien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-11-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220415045258.199825-10-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com>
Acked-by: NDavid Sterba <dsterba@suse.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-9-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Sanitize the calling conventions and use a goto label to cleanup the
code flow.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NChristoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220415045258.199825-8-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

The bdev version does the right thing for partitions, so use that.

Fixes: 9104d31a ("drbd: introduce WRITE_SAME support")
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NChristoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220415045258.199825-7-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Use the bdev based limits helpers where they exist.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NChristoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220415045258.199825-6-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Fold each branch into its only caller.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NChristoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220415045258.199825-5-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>

Use the proper bdev_discard_alignment helper that accounts for partition
offsets.

Fixes: c66ac9db ("[SCSI] target: Add LIO target core v4.0.0-rc6")
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-4-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>