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f2fs: avoid hungtask problem caused by losing wake_up

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The D state of wait_on_all_pages_writeback should be waken by
function f2fs_write_end_io when all writeback pages have been
succesfully written to device. It's possible that wake_up comes
between get_pages and io_schedule. Maybe in this case it will
lost wake_up and still in D state even if all pages have been
write back to device, and finally, the whole system will be into
the hungtask state.

                if (!get_pages(sbi, F2FS_WRITEBACK))
                         break;
					<---------  wake_up
                io_schedule();

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Biao He <hebiao6@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yunlei He 2016-02-23 12:07:56 +08:00 committed by Zhao Wei Liew
parent d37aaf04b7
commit 76fa243e45
2 changed files with 2 additions and 1 deletions
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2
fs/f2fs/checkpoint.c
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@ -921,7 +921,7 @@ static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
if (!get_pages(sbi, F2FS_WRITEBACK))
break;
io_schedule();
io_schedule_timeout(5*HZ);
}
finish_wait(&sbi->cp_wait, &wait);
}

1
kernel/sched/core.c
View file

@ -4767,6 +4767,7 @@ long __sched io_schedule_timeout(long timeout)
delayacct_blkio_end();
return ret;
}
EXPORT_SYMBOL(io_schedule_timeout);
/**
* sys_sched_get_priority_max - return maximum RT priority.