xiaomi-sm8450/android_kernel_xiaomi_sm8450
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f2fs: introduce DEFAULT_IO_TIMEOUT

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As Geert Uytterhoeven reported:

for parameter HZ/50 in congestion_wait(BLK_RW_ASYNC, HZ/50);

On some platforms, HZ can be less than 50, then unexpected 0 timeout
jiffies will be set in congestion_wait().

This patch introduces a macro DEFAULT_IO_TIMEOUT to wrap a determinate
value with msecs_to_jiffies(20) to instead HZ/50 to avoid such issue.

Quoted from Geert Uytterhoeven:

"A timeout of HZ means 1 second.
HZ/50 means 20 ms, but has the risk of being zero, if HZ < 50.

If you want to use a timeout of 20 ms, you best use msecs_to_jiffies(20),
as that takes care of the special cases, and never returns 0."

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2020-02-17 17:45:44 +08:00
committed by Jaegeuk Kim
parent 2bac07635d
commit 5df7731f60
10 changed files with 25 additions and 15 deletions
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3
fs/f2fs/compress.c
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@@ -988,7 +988,8 @@ retry_write:
} else if (ret == -EAGAIN) {
ret = 0;
cond_resched();
congestion_wait(BLK_RW_ASYNC, HZ/50);
congestion_wait(BLK_RW_ASYNC,
DEFAULT_IO_TIMEOUT);
lock_page(cc->rpages[i]);
clear_page_dirty_for_io(cc->rpages[i]);
goto retry_write;