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md/r5cache: sysfs entry journal_mode

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With write cache, journal_mode is the knob to switch between
write-back and write-through.

Below is an example:

root@virt-test:~/# cat /sys/block/md0/md/journal_mode
[write-through] write-back
root@virt-test:~/# echo write-back > /sys/block/md0/md/journal_mode
root@virt-test:~/# cat /sys/block/md0/md/journal_mode
write-through [write-back]

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2016-11-17 15:24:41 -08:00 • committed by Shaohua Li
parent a39f7afde3
commit 2c7da14b90
3 changed files with 67 additions and 0 deletions
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1
drivers/md/raid5.c
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@ -6319,6 +6319,7 @@ static struct attribute *raid5_attrs[] = {
&raid5_group_thread_cnt.attr,
&raid5_skip_copy.attr,
&raid5_rmw_level.attr,
&r5c_journal_mode.attr,
NULL,
};
static struct attribute_group raid5_attrs_group = {