Btrfs fixes for 6.3-rc8

Hi,

two patches fixing the problem with aync discard. The default settings had a low IOPS limit and processing a large batch to discard would take a long time. On laptops this can cause increased power consumption due to disk activity. As async discard has been on by default since 6.2 this likely affects a lot of users.

Please pull, thanks.

- increase the default IOPS limit 10x which reportedly helped

- setting the sysfs IOPS value to 0 now does not throttle anymore allowing the discards to be processed at full speed, previously there was an arbitrary 6 hour target for processing the pending batch

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The following changes since commit 68d99ab0e9221ef54506f827576c5a914680eeaf:

btrfs: fix fast csum implementation detection (2023-04-06 16:34:13 +0200)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-6.3-rc7-tag

for you to fetch changes up to ef9cddfe57d86aac6b509b550136395669159b30:

btrfs: reinterpret async discard iops_limit=0 as no delay (2023-04-21 00:28:23 +0200)

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Boris Burkov (2):
btrfs: set default discard iops_limit to 1000
btrfs: reinterpret async discard iops_limit=0 as no delay

 fs/btrfs/discard.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)