[dm-devel] [PATCH v2 06/11] dm: move zone related code to dm-zone.c
Damien Le Moal
damien.lemoal at wdc.com
Thu May 20 04:22:23 UTC 2021
Move core and table code used for zoned targets and conditionally
defined with #ifdef CONFIG_BLK_DEV_ZONED to the new file dm-zone.c.
This file is conditionally compiled depending on CONFIG_BLK_DEV_ZONED.
The small helper dm_set_zones_restrictions() is introduced to
initialize a mapped device request queue zone attributes in
dm_table_set_restrictions().
Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn at wdc.com>
---
drivers/md/Makefile | 4 ++
drivers/md/dm-table.c | 14 ++----
drivers/md/dm-zone.c | 102 ++++++++++++++++++++++++++++++++++++++++++
drivers/md/dm.c | 78 --------------------------------
drivers/md/dm.h | 11 +++++
5 files changed, 120 insertions(+), 89 deletions(-)
create mode 100644 drivers/md/dm-zone.c
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index ef7ddc27685c..a74aaf8b1445 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -92,6 +92,10 @@ ifeq ($(CONFIG_DM_UEVENT),y)
dm-mod-objs += dm-uevent.o
endif
+ifeq ($(CONFIG_BLK_DEV_ZONED),y)
+dm-mod-objs += dm-zone.o
+endif
+
ifeq ($(CONFIG_DM_VERITY_FEC),y)
dm-verity-objs += dm-verity-fec.o
endif
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 21fd9cd4da32..dd9f648ab598 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -2064,17 +2064,9 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
dm_table_any_dev_attr(t, device_is_not_random, NULL))
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
- /*
- * For a zoned target, the number of zones should be updated for the
- * correct value to be exposed in sysfs queue/nr_zones. For a BIO based
- * target, this is all that is needed.
- */
-#ifdef CONFIG_BLK_DEV_ZONED
- if (blk_queue_is_zoned(q)) {
- WARN_ON_ONCE(queue_is_mq(q));
- q->nr_zones = blkdev_nr_zones(t->md->disk);
- }
-#endif
+ /* For a zoned target, setup the zones related queue attributes */
+ if (blk_queue_is_zoned(q))
+ dm_set_zones_restrictions(t, q);
dm_update_keyslot_manager(q, t);
blk_queue_update_readahead(q);
diff --git a/drivers/md/dm-zone.c b/drivers/md/dm-zone.c
new file mode 100644
index 000000000000..3243c42b7951
--- /dev/null
+++ b/drivers/md/dm-zone.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/blkdev.h>
+
+#include "dm-core.h"
+
+/*
+ * User facing dm device block device report zone operation. This calls the
+ * report_zones operation for each target of a device table. This operation is
+ * generally implemented by targets using dm_report_zones().
+ */
+int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
+ unsigned int nr_zones, report_zones_cb cb, void *data)
+{
+ struct mapped_device *md = disk->private_data;
+ struct dm_table *map;
+ int srcu_idx, ret;
+ struct dm_report_zones_args args = {
+ .next_sector = sector,
+ .orig_data = data,
+ .orig_cb = cb,
+ };
+
+ if (dm_suspended_md(md))
+ return -EAGAIN;
+
+ map = dm_get_live_table(md, &srcu_idx);
+ if (!map) {
+ ret = -EIO;
+ goto out;
+ }
+
+ do {
+ struct dm_target *tgt;
+
+ tgt = dm_table_find_target(map, args.next_sector);
+ if (WARN_ON_ONCE(!tgt->type->report_zones)) {
+ ret = -EIO;
+ goto out;
+ }
+
+ args.tgt = tgt;
+ ret = tgt->type->report_zones(tgt, &args,
+ nr_zones - args.zone_idx);
+ if (ret < 0)
+ goto out;
+ } while (args.zone_idx < nr_zones &&
+ args.next_sector < get_capacity(disk));
+
+ ret = args.zone_idx;
+out:
+ dm_put_live_table(md, srcu_idx);
+ return ret;
+}
+
+int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data)
+{
+ struct dm_report_zones_args *args = data;
+ sector_t sector_diff = args->tgt->begin - args->start;
+
+ /*
+ * Ignore zones beyond the target range.
+ */
+ if (zone->start >= args->start + args->tgt->len)
+ return 0;
+
+ /*
+ * Remap the start sector and write pointer position of the zone
+ * to match its position in the target range.
+ */
+ zone->start += sector_diff;
+ if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) {
+ if (zone->cond == BLK_ZONE_COND_FULL)
+ zone->wp = zone->start + zone->len;
+ else if (zone->cond == BLK_ZONE_COND_EMPTY)
+ zone->wp = zone->start;
+ else
+ zone->wp += sector_diff;
+ }
+
+ args->next_sector = zone->start + zone->len;
+ return args->orig_cb(zone, args->zone_idx++, args->orig_data);
+}
+EXPORT_SYMBOL_GPL(dm_report_zones_cb);
+
+void dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q)
+{
+ if (!blk_queue_is_zoned(q))
+ return;
+
+ /*
+ * For a zoned target, the number of zones should be updated for the
+ * correct value to be exposed in sysfs queue/nr_zones. For a BIO based
+ * target, this is all that is needed.
+ */
+ WARN_ON_ONCE(queue_is_mq(q));
+ q->nr_zones = blkdev_nr_zones(t->md->disk);
+}
+
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index a9211575bfed..45d2dc2ee844 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -444,84 +444,6 @@ static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
return dm_get_geometry(md, geo);
}
-#ifdef CONFIG_BLK_DEV_ZONED
-int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data)
-{
- struct dm_report_zones_args *args = data;
- sector_t sector_diff = args->tgt->begin - args->start;
-
- /*
- * Ignore zones beyond the target range.
- */
- if (zone->start >= args->start + args->tgt->len)
- return 0;
-
- /*
- * Remap the start sector and write pointer position of the zone
- * to match its position in the target range.
- */
- zone->start += sector_diff;
- if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) {
- if (zone->cond == BLK_ZONE_COND_FULL)
- zone->wp = zone->start + zone->len;
- else if (zone->cond == BLK_ZONE_COND_EMPTY)
- zone->wp = zone->start;
- else
- zone->wp += sector_diff;
- }
-
- args->next_sector = zone->start + zone->len;
- return args->orig_cb(zone, args->zone_idx++, args->orig_data);
-}
-EXPORT_SYMBOL_GPL(dm_report_zones_cb);
-
-static int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
- unsigned int nr_zones, report_zones_cb cb, void *data)
-{
- struct mapped_device *md = disk->private_data;
- struct dm_table *map;
- int srcu_idx, ret;
- struct dm_report_zones_args args = {
- .next_sector = sector,
- .orig_data = data,
- .orig_cb = cb,
- };
-
- if (dm_suspended_md(md))
- return -EAGAIN;
-
- map = dm_get_live_table(md, &srcu_idx);
- if (!map) {
- ret = -EIO;
- goto out;
- }
-
- do {
- struct dm_target *tgt;
-
- tgt = dm_table_find_target(map, args.next_sector);
- if (WARN_ON_ONCE(!tgt->type->report_zones)) {
- ret = -EIO;
- goto out;
- }
-
- args.tgt = tgt;
- ret = tgt->type->report_zones(tgt, &args,
- nr_zones - args.zone_idx);
- if (ret < 0)
- goto out;
- } while (args.zone_idx < nr_zones &&
- args.next_sector < get_capacity(disk));
-
- ret = args.zone_idx;
-out:
- dm_put_live_table(md, srcu_idx);
- return ret;
-}
-#else
-#define dm_blk_report_zones NULL
-#endif /* CONFIG_BLK_DEV_ZONED */
-
static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx,
struct block_device **bdev)
{
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index b441ad772c18..fdf1536a4b62 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -100,6 +100,17 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
*/
#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
+/*
+ * Zoned targets related functions.
+ */
+void dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
+#ifdef CONFIG_BLK_DEV_ZONED
+int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
+ unsigned int nr_zones, report_zones_cb cb, void *data);
+#else
+#define dm_blk_report_zones NULL
+#endif
+
/*-----------------------------------------------------------------
* A registry of target types.
*---------------------------------------------------------------*/
--
2.31.1
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