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docs: block: biodoc.rst: Drop the obsolete and incorrect content 

Since commit 7eaceaccab ("block: remove per-queue plugging"), kernel
has removed blk_run_address_space(), blk_unplug() and sync_buffer(),
and moved to on-stack plugging. The document has been obsolete for
years.
Given that there is no obvious counterparts in the new mechinism to
replace old APIs, this patch drops the content directly.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Link: https://lore.kernel.org/r/20220207074931.20067-1-song.bao.hua@hisilicon.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Barry Song 2022-02-07 15:49:31 +08:00 committed by Jens Axboe
parent 672fdcf0e7
commit 2e2f0199a2
1 changed files with 1 additions and 5 deletions
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Documentation/block/biodoc.rst
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@ -965,11 +965,7 @@ till it fills up with a few more requests, before starting to service
the requests. This provides an opportunity to merge/sort the requests before
passing them down to the device. There are various conditions when the queue is
unplugged (to open up the flow again), either through a scheduled task or
could be on demand. For example wait_on_buffer sets the unplugging going
through sync_buffer() running blk_run_address_space(mapping). Or the caller
can do it explicity through blk_unplug(bdev). So in the read case,
the queue gets explicitly unplugged as part of waiting for completion on that
buffer.
could be on demand.
Aside:
This is kind of controversial territory, as it's not clear if plugging is