GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

md/r5cache: handle FLUSH and FUA

Browse source 
With raid5 cache, we committing data from journal device. When
there is flush request, we need to flush journal device's cache.
This was not needed in raid5 journal, because we will flush the
journal before committing data to raid disks.

This is similar to FUA, except that we also need flush journal for
FUA. Otherwise, corruptions in earlier meta data will stop recovery
from reaching FUA data.

slightly changed the code by Shaohua

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Song Liu 2016-11-18 16:46:50 -08:00 • committed by Shaohua Li
parent 5aabf7c49d
commit 3bddb7f8f2
3 changed files with 157 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

12
drivers/md/raid5.c
View file

@ -5248,6 +5248,7 @@ static void raid5_make_request(struct mddev *mddev, struct bio * bi)
int remaining;
DEFINE_WAIT(w);
bool do_prepare;
bool do_flush = false;
if (unlikely(bi->bi_opf & REQ_PREFLUSH)) {
int ret = r5l_handle_flush_request(conf->log, bi);
@ -5259,6 +5260,11 @@ static void raid5_make_request(struct mddev *mddev, struct bio * bi)
return;
}
/* ret == -EAGAIN, fallback */
/*
* if r5l_handle_flush_request() didn't clear REQ_PREFLUSH,
* we need to flush journal device
*/
do_flush = bi->bi_opf & REQ_PREFLUSH;
}
md_write_start(mddev, bi);
@ -5398,6 +5404,12 @@ static void raid5_make_request(struct mddev *mddev, struct bio * bi)
do_prepare = true;
goto retry;
}
if (do_flush) {
set_bit(STRIPE_R5C_PREFLUSH, &sh->state);
/* we only need flush for one stripe */
do_flush = false;
}
set_bit(STRIPE_HANDLE, &sh->state);
clear_bit(STRIPE_DELAYED, &sh->state);
if ((!sh->batch_head || sh == sh->batch_head) &&