[PATCH v8 06/11] block: Modify revalidate zones
From: Johannes Thumshirn <hidden>
Date: 2020-04-27 11:32:23
Also in:
linux-fsdevel, linux-scsi
Subsystem:
block layer, the rest, zoned block device (block layer) · Maintainers:
Jens Axboe, Linus Torvalds, Damien Le Moal
From: Damien Le Moal <redacted> Modify the interface of blk_revalidate_disk_zones() to add an optional driver callback function that a driver can use to extend processing done during zone revalidation. The callback, if defined, is executed with the device request queue frozen, after all zones have been inspected. Signed-off-by: Damien Le Moal <redacted> Signed-off-by: Johannes Thumshirn <redacted> Reviewed-by: Christoph Hellwig <hch@lst.de> --- block/blk-zoned.c | 9 ++++++++- drivers/block/null_blk_zoned.c | 2 +- include/linux/blkdev.h | 3 ++- 3 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index c822cfa7a102..23831fa8701d 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c@@ -471,14 +471,19 @@ static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx, /** * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps * @disk: Target disk + * @update_driver_data: Callback to update driver data on the frozen disk * * Helper function for low-level device drivers to (re) allocate and initialize * a disk request queue zone bitmaps. This functions should normally be called * within the disk ->revalidate method for blk-mq based drivers. For BIO based * drivers only q->nr_zones needs to be updated so that the sysfs exposed value * is correct. + * If the @update_driver_data callback function is not NULL, the callback is + * executed with the device request queue frozen after all zones have been + * checked. */ -int blk_revalidate_disk_zones(struct gendisk *disk) +int blk_revalidate_disk_zones(struct gendisk *disk, + void (*update_driver_data)(struct gendisk *disk)) { struct request_queue *q = disk->queue; struct blk_revalidate_zone_args args = {
@@ -512,6 +517,8 @@ int blk_revalidate_disk_zones(struct gendisk *disk) q->nr_zones = args.nr_zones; swap(q->seq_zones_wlock, args.seq_zones_wlock); swap(q->conv_zones_bitmap, args.conv_zones_bitmap); + if (update_driver_data) + update_driver_data(disk); ret = 0; } else { pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
index 9e4bcdad1a80..46641df2e58e 100644
--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c@@ -73,7 +73,7 @@ int null_register_zoned_dev(struct nullb *nullb) struct request_queue *q = nullb->q; if (queue_is_mq(q)) - return blk_revalidate_disk_zones(nullb->disk); + return blk_revalidate_disk_zones(nullb->disk, NULL); blk_queue_chunk_sectors(q, nullb->dev->zone_size_sects); q->nr_zones = blkdev_nr_zones(nullb->disk);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d6e6ce3dc656..fd405dac8eb0 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h@@ -357,7 +357,8 @@ unsigned int blkdev_nr_zones(struct gendisk *disk); extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, sector_t sectors, sector_t nr_sectors, gfp_t gfp_mask); -extern int blk_revalidate_disk_zones(struct gendisk *disk); +int blk_revalidate_disk_zones(struct gendisk *disk, + void (*update_driver_data)(struct gendisk *disk)); extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg);
--
2.24.1