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Message-Id: <20201029145841.144173-18-hch@lst.de>
Date: Thu, 29 Oct 2020 15:58:40 +0100
From: Christoph Hellwig <hch@....de>
To: Jens Axboe <axboe@...nel.dk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Denis Efremov <efremov@...ux.com>,
"David S. Miller" <davem@...emloft.net>,
Song Liu <song@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
Finn Thain <fthain@...egraphics.com.au>,
Michael Schmitz <schmitzmic@...il.com>,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-ide@...r.kernel.org, linux-raid@...r.kernel.org,
linux-scsi@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
Hannes Reinecke <hare@...e.de>
Subject: [PATCH 17/18] z2ram: use separate gendisk for the different modes
Use separate gendisks (which share a tag_set) for the different operating
modes instead of redirecting the gendisk lookup using a probe callback.
This avoids potential problems with aliased block_device instances and
will eventually allow for removing the blk_register_region framework.
Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Hannes Reinecke <hare@...e.de>
---
drivers/block/z2ram.c | 100 ++++++++++++++++++++++++------------------
1 file changed, 58 insertions(+), 42 deletions(-)
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index eafecc9a72b38d..c1d20818e64920 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -63,7 +63,7 @@ static int current_device = -1;
static DEFINE_SPINLOCK(z2ram_lock);
-static struct gendisk *z2ram_gendisk;
+static struct gendisk *z2ram_gendisk[Z2MINOR_COUNT];
static blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
@@ -283,7 +283,7 @@ static int z2_open(struct block_device *bdev, fmode_t mode)
current_device = device;
z2ram_size <<= Z2RAM_CHUNKSHIFT;
- set_capacity(z2ram_gendisk, z2ram_size >> 9);
+ set_capacity(z2ram_gendisk[device], z2ram_size >> 9);
}
mutex_unlock(&z2ram_mutex);
@@ -315,71 +315,87 @@ static const struct block_device_operations z2_fops = {
.release = z2_release,
};
-static struct kobject *z2_find(dev_t dev, int *part, void *data)
-{
- *part = 0;
- return get_disk_and_module(z2ram_gendisk);
-}
-
-static struct request_queue *z2_queue;
static struct blk_mq_tag_set tag_set;
static const struct blk_mq_ops z2_mq_ops = {
.queue_rq = z2_queue_rq,
};
+static int z2ram_register_disk(int minor)
+{
+ struct request_queue *q;
+ struct gendisk *disk;
+
+ disk = alloc_disk(1);
+ if (!disk)
+ return -ENOMEM;
+
+ q = blk_mq_init_queue(&tag_set);
+ if (IS_ERR(q)) {
+ put_disk(disk);
+ return PTR_ERR(q);
+ }
+
+ disk->major = Z2RAM_MAJOR;
+ disk->first_minor = minor;
+ disk->fops = &z2_fops;
+ if (minor)
+ sprintf(disk->disk_name, "z2ram%d", minor);
+ else
+ sprintf(disk->disk_name, "z2ram");
+ disk->queue = q;
+
+ z2ram_gendisk[minor] = disk;
+ add_disk(disk);
+ return 0;
+}
+
static int __init z2_init(void)
{
- int ret;
+ int ret, i;
if (!MACH_IS_AMIGA)
return -ENODEV;
- ret = -EBUSY;
if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
- goto err;
-
- ret = -ENOMEM;
- z2ram_gendisk = alloc_disk(1);
- if (!z2ram_gendisk)
- goto out_disk;
-
- z2_queue = blk_mq_init_sq_queue(&tag_set, &z2_mq_ops, 16,
- BLK_MQ_F_SHOULD_MERGE);
- if (IS_ERR(z2_queue)) {
- ret = PTR_ERR(z2_queue);
- z2_queue = NULL;
- goto out_queue;
+ return -EBUSY;
+
+ tag_set.ops = &z2_mq_ops;
+ tag_set.nr_hw_queues = 1;
+ tag_set.nr_maps = 1;
+ tag_set.queue_depth = 16;
+ tag_set.numa_node = NUMA_NO_NODE;
+ tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
+ ret = blk_mq_alloc_tag_set(&tag_set);
+ if (ret)
+ goto out_unregister_blkdev;
+
+ for (i = 0; i < Z2MINOR_COUNT; i++) {
+ ret = z2ram_register_disk(i);
+ if (ret && i == 0)
+ goto out_free_tagset;
}
- z2ram_gendisk->major = Z2RAM_MAJOR;
- z2ram_gendisk->first_minor = 0;
- z2ram_gendisk->fops = &z2_fops;
- sprintf(z2ram_gendisk->disk_name, "z2ram");
-
- z2ram_gendisk->queue = z2_queue;
- add_disk(z2ram_gendisk);
- blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
- z2_find, NULL, NULL);
-
return 0;
-out_queue:
- put_disk(z2ram_gendisk);
-out_disk:
+out_free_tagset:
+ blk_mq_free_tag_set(&tag_set);
+out_unregister_blkdev:
unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
-err:
return ret;
}
static void __exit z2_exit(void)
{
int i, j;
- blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
+
unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
- del_gendisk(z2ram_gendisk);
- put_disk(z2ram_gendisk);
- blk_cleanup_queue(z2_queue);
+
+ for (i = 0; i < Z2MINOR_COUNT; i++) {
+ del_gendisk(z2ram_gendisk[i]);
+ blk_cleanup_queue(z2ram_gendisk[i]->queue);
+ put_disk(z2ram_gendisk[i]);
+ }
blk_mq_free_tag_set(&tag_set);
if (current_device != -1) {
--
2.28.0
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