bcachefs: Journal writes are now IOPRIO_CLASS_RT

System performance is particularly sensitive to journal write latency,
the number of outstanding journal writes is bounded and we can't issue
journal flushes until other journal writes have completed.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/journal_io.c b/fs/bcachefs/journal_io.c
index 7f2efe85a805292da39fcf06724c9d4aea27551c..11c39e0c34f4cb393b0dca68a65e864c7515f313 100644 (file)
--- a/fs/bcachefs/journal_io.c
+++ b/fs/bcachefs/journal_io.c
@@ -17,6 +17,7 @@
 #include "sb-clean.h"
 #include "trace.h"
 
+#include <linux/ioprio.h>
 #include <linux/string_choices.h>
 
 void bch2_journal_pos_from_member_info_set(struct bch_fs *c)
@@ -1763,6 +1764,7 @@ static CLOSURE_CALLBACK(journal_write_submit)
                bio->bi_iter.bi_sector  = ptr->offset;
                bio->bi_end_io          = journal_write_endio;
                bio->bi_private         = ca;
+               bio->bi_ioprio          = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_RT, 0);
 
                BUG_ON(bio->bi_iter.bi_sector == ca->prev_journal_sector);
                ca->prev_journal_sector = bio->bi_iter.bi_sector;