dm-verity: support block number limits for different ioprio classes

Calling verity_verify_io in bh for IO of all sizes is not suitable for
embedded devices. From our tests, it can improve the perfor

dm-verity: support block number limits for different ioprio classes

Calling verity_verify_io in bh for IO of all sizes is not suitable for
embedded devices. From our tests, it can improve the performance of 4K
synchronise random reads.
For example:
./fio --name=rand_read --ioengine=psync --rw=randread --bs=4K \
--direct=1 --numjobs=8 --runtime=60 --time_based --group_reporting \
--filename=/dev/block/mapper/xx-verity

But it will degrade the performance of 512K synchronise sequential reads
on our devices.
For example:
./fio --name=read --ioengine=psync --rw=read --bs=512K --direct=1 \
--numjobs=8 --runtime=60 --time_based --group_reporting \
--filename=/dev/block/mapper/xx-verity

A parameter array is introduced by this change. And users can modify the
default config by /sys/module/dm_verity/parameters/use_bh_bytes.

The default limits for NONE/RT/BE is set to 8192.
The default limits for IDLE is set to 0.

Call verity_verify_io directly when verity_end_io is not in hardirq.

Signed-off-by: LongPing Wei <weilongping@oppo.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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dm-crypt: Document integrity_key_size option.

This patch adds documentation for new option introduced in commit
4441686b24a1 ("dm-crypt: Allow to specify the integrity key size as option").

Signed-

dm-crypt: Document integrity_key_size option.

This patch adds documentation for new option introduced in commit
4441686b24a1 ("dm-crypt: Allow to specify the integrity key size as option").

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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dm-integrity: Document Inline mode for storing integrity data

This patch adds documentation for new 'I' mode for dm-integrity
introduced in commit
fb0987682c62 ("dm-integrity: introduce the Inline m

dm-integrity: Document Inline mode for storing integrity data

This patch adds documentation for new 'I' mode for dm-integrity
introduced in commit
fb0987682c62 ("dm-integrity: introduce the Inline mode").

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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dm-verity: Document restart_on_error and panic_on_error options

This patch adds documentation for options introduced in commit
f811b83879fb ("dm-verity: introduce the options restart_on_error and pa

dm-verity: Document restart_on_error and panic_on_error options

This patch adds documentation for options introduced in commit
f811b83879fb ("dm-verity: introduce the options restart_on_error and panic_on_error").

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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