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authorSong Liu <songliubraving@fb.com>2016-11-17 15:24:41 -0800
committerShaohua Li <shli@fb.com>2016-11-18 13:27:24 -0800
commit2c7da14b90a01e48b17a028de6050a796cfd6d8d (patch)
tree69f8c6710e71f270146978d7e99744962a5eadc8 /drivers/md/raid5.h
parenta39f7afde358ca89e9fc09a5525d3f8631a98a3a (diff)
downloadlinux-2c7da14b90a01e48b17a028de6050a796cfd6d8d.tar.bz2
md/r5cache: sysfs entry journal_mode
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>
Diffstat (limited to 'drivers/md/raid5.h')
-rw-r--r--drivers/md/raid5.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 35b4c0f0a850..a698113c6188 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -773,4 +773,5 @@ extern void r5c_make_stripe_write_out(struct stripe_head *sh);
extern void r5c_flush_cache(struct r5conf *conf, int num);
extern void r5c_check_stripe_cache_usage(struct r5conf *conf);
extern void r5c_check_cached_full_stripe(struct r5conf *conf);
+extern struct md_sysfs_entry r5c_journal_mode;
#endif