btrfs: limit max discard size for async discard

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Throttle the maximum size of a discard so that we can provide an upper
bound for the rate of async discard. While the block layer is able to
split discards into the appropriate sized discards, we want to be able
to account more accurately the rate at which we are consuming NCQ slots
as well as limit the upper bound of work for a discard.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Dennis Zhou 2020-01-02 16:26:37 -05:00 • committed by David Sterba

parent e93591bb6e

commit 4aa9ad5203

2 changed files with 37 additions and 9 deletions

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5

fs/btrfs/discard.h

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41

fs/btrfs/free-space-cache.c

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