1 files changed, 63 insertions, 0 deletions

diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c
index 0b096ddc9c1e..17e9e7d51097 100644
--- a/drivers/md/raid5-ppl.c
+++ b/drivers/md/raid5-ppl.c
@@ -20,6 +20,7 @@
 #include <linux/raid/md_p.h>
 #include "md.h"
 #include "raid5.h"
+#include "raid5-log.h"
 
 /*
  * PPL consists of a 4KB header (struct ppl_header) and at least 128KB for
@@ -115,6 +116,8 @@ struct ppl_conf {
         /* stripes to retry if failed to allocate io_unit */
         struct list_head no_mem_stripes;
         spinlock_t no_mem_stripes_lock;
+
+        unsigned short write_hint;
 };
 
 struct ppl_log {
@@ -474,6 +477,7 @@ static void ppl_submit_iounit(struct ppl_io_unit *io)
         bio_set_dev(bio, log->rdev->bdev);
         bio->bi_iter.bi_sector = log->next_io_sector;
         bio_add_page(bio, io->header_page, PAGE_SIZE, 0);
+        bio->bi_write_hint = ppl_conf->write_hint;
 
         pr_debug("%s: log->current_io_sector: %llu\n", __func__,
             (unsigned long long)log->next_io_sector);
@@ -503,6 +507,7 @@ static void ppl_submit_iounit(struct ppl_io_unit *io)
                         bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_PAGES,
                                                &ppl_conf->bs);
                         bio->bi_opf = prev->bi_opf;
+                        bio->bi_write_hint = prev->bi_write_hint;
                         bio_copy_dev(bio, prev);
                         bio->bi_iter.bi_sector = bio_end_sector(prev);
                         bio_add_page(bio, sh->ppl_page, PAGE_SIZE, 0);
@@ -1407,6 +1412,7 @@ int ppl_init_log(struct r5conf *conf)
         atomic64_set(&ppl_conf->seq, 0);
         INIT_LIST_HEAD(&ppl_conf->no_mem_stripes);
         spin_lock_init(&ppl_conf->no_mem_stripes_lock);
+        ppl_conf->write_hint = RWF_WRITE_LIFE_NOT_SET;
 
         if (!mddev->external) {
                 ppl_conf->signature = ~crc32c_le(~0, mddev->uuid, sizeof(mddev->uuid));
@@ -1501,3 +1507,60 @@ int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add)
 
         return ret;
 }
+
+static ssize_t
+ppl_write_hint_show(struct mddev *mddev, char *buf)
+{
+        size_t ret = 0;
+        struct r5conf *conf;
+        struct ppl_conf *ppl_conf = NULL;
+
+        spin_lock(&mddev->lock);
+        conf = mddev->private;
+        if (conf && raid5_has_ppl(conf))
+                ppl_conf = conf->log_private;
+        ret = sprintf(buf, "%d\n", ppl_conf ? ppl_conf->write_hint : 0);
+        spin_unlock(&mddev->lock);
+
+        return ret;
+}
+
+static ssize_t
+ppl_write_hint_store(struct mddev *mddev, const char *page, size_t len)
+{
+        struct r5conf *conf;
+        struct ppl_conf *ppl_conf;
+        int err = 0;
+        unsigned short new;
+
+        if (len >= PAGE_SIZE)
+                return -EINVAL;
+        if (kstrtou16(page, 10, &new))
+                return -EINVAL;
+
+        err = mddev_lock(mddev);
+        if (err)
+                return err;
+
+        conf = mddev->private;
+        if (!conf) {
+                err = -ENODEV;
+        } else if (raid5_has_ppl(conf)) {
+                ppl_conf = conf->log_private;
+                if (!ppl_conf)
+                        err = -EINVAL;
+                else
+                        ppl_conf->write_hint = new;
+        } else {
+                err = -EINVAL;
+        }
+
+        mddev_unlock(mddev);
+
+        return err ?: len;
+}
+
+struct md_sysfs_entry
+ppl_write_hint = __ATTR(ppl_write_hint, S_IRUGO | S_IWUSR,
+                        ppl_write_hint_show,
+                        ppl_write_hint_store);