[mirror_ubuntu-eoan-kernel.git] / drivers / block / aoe / aoeblk.c

/* Copyright (c) 2013 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoeblk.c
 * block device routines
 */

#include <linux/kernel.h>
#include <linux/hdreg.h>
#include <linux/blk-mq.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/genhd.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/moduleparam.h>
#include <linux/debugfs.h>
#include <scsi/sg.h>
#include "aoe.h"

static DEFINE_MUTEX(aoeblk_mutex);
static struct kmem_cache *buf_pool_cache;
static struct dentry *aoe_debugfs_dir;

/* GPFS needs a larger value than the default. */
static int aoe_maxsectors;
module_param(aoe_maxsectors, int, 0644);
MODULE_PARM_DESC(aoe_maxsectors,
	"When nonzero, set the maximum number of sectors per I/O request");

static ssize_t aoedisk_show_state(struct device *dev,
				  struct device_attribute *attr, char *page)
{
	struct gendisk *disk = dev_to_disk(dev);
	struct aoedev *d = disk->private_data;

	return snprintf(page, PAGE_SIZE,
			"%s%s\n",
			(d->flags & DEVFL_UP) ? "up" : "down",
			(d->flags & DEVFL_KICKME) ? ",kickme" :
			(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
	/* I'd rather see nopen exported so we can ditch closewait */
}
static ssize_t aoedisk_show_mac(struct device *dev,
				struct device_attribute *attr, char *page)
{
	struct gendisk *disk = dev_to_disk(dev);
	struct aoedev *d = disk->private_data;
	struct aoetgt *t = d->targets[0];

	if (t == NULL)
		return snprintf(page, PAGE_SIZE, "none\n");
	return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
}
static ssize_t aoedisk_show_netif(struct device *dev,
				  struct device_attribute *attr, char *page)
{
	struct gendisk *disk = dev_to_disk(dev);
	struct aoedev *d = disk->private_data;
	struct net_device *nds[8], **nd, **nnd, **ne;
	struct aoetgt **t, **te;
	struct aoeif *ifp, *e;
	char *p;

	memset(nds, 0, sizeof nds);
	nd = nds;
	ne = nd + ARRAY_SIZE(nds);
	t = d->targets;
	te = t + d->ntargets;
	for (; t < te && *t; t++) {
		ifp = (*t)->ifs;
		e = ifp + NAOEIFS;
		for (; ifp < e && ifp->nd; ifp++) {
			for (nnd = nds; nnd < nd; nnd++)
				if (*nnd == ifp->nd)
					break;
			if (nnd == nd && nd != ne)
				*nd++ = ifp->nd;
		}
	}

	ne = nd;
	nd = nds;
	if (*nd == NULL)
		return snprintf(page, PAGE_SIZE, "none\n");
	for (p = page; nd < ne; nd++)
		p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
			p == page ? "" : ",", (*nd)->name);
	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
	return p-page;
}
/* firmware version */
static ssize_t aoedisk_show_fwver(struct device *dev,
				  struct device_attribute *attr, char *page)
{
	struct gendisk *disk = dev_to_disk(dev);
	struct aoedev *d = disk->private_data;

	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
}
static ssize_t aoedisk_show_payload(struct device *dev,
				    struct device_attribute *attr, char *page)
{
	struct gendisk *disk = dev_to_disk(dev);
	struct aoedev *d = disk->private_data;

	return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
}

static int aoedisk_debugfs_show(struct seq_file *s, void *ignored)
{
	struct aoedev *d;
	struct aoetgt **t, **te;
	struct aoeif *ifp, *ife;
	unsigned long flags;
	char c;

	d = s->private;
	seq_printf(s, "rttavg: %d rttdev: %d\n",
		d->rttavg >> RTTSCALE,
		d->rttdev >> RTTDSCALE);
	seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool));
	seq_printf(s, "kicked: %ld\n", d->kicked);
	seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt);
	seq_printf(s, "ref: %ld\n", d->ref);

	spin_lock_irqsave(&d->lock, flags);
	t = d->targets;
	te = t + d->ntargets;
	for (; t < te && *t; t++) {
		c = '\t';
		seq_printf(s, "falloc: %ld\n", (*t)->falloc);
		seq_printf(s, "ffree: %p\n",
			list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next);
		seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout,
			(*t)->maxout, (*t)->nframes);
		seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh);
		seq_printf(s, "\ttaint:%d\n", (*t)->taint);
		seq_printf(s, "\tr:%d\n", (*t)->rpkts);
		seq_printf(s, "\tw:%d\n", (*t)->wpkts);
		ifp = (*t)->ifs;
		ife = ifp + ARRAY_SIZE((*t)->ifs);
		for (; ifp->nd && ifp < ife; ifp++) {
			seq_printf(s, "%c%s", c, ifp->nd->name);
			c = ',';
		}
		seq_puts(s, "\n");
	}
	spin_unlock_irqrestore(&d->lock, flags);

	return 0;
}

static int aoe_debugfs_open(struct inode *inode, struct file *file)
{
	return single_open(file, aoedisk_debugfs_show, inode->i_private);
}

static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL);
static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL);
static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL);
static struct device_attribute dev_attr_firmware_version = {
	.attr = { .name = "firmware-version", .mode = 0444 },
	.show = aoedisk_show_fwver,
};
static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL);

static struct attribute *aoe_attrs[] = {
	&dev_attr_state.attr,
	&dev_attr_mac.attr,
	&dev_attr_netif.attr,
	&dev_attr_firmware_version.attr,
	&dev_attr_payload.attr,
	NULL,
};

static const struct attribute_group aoe_attr_group = {
	.attrs = aoe_attrs,
};

static const struct attribute_group *aoe_attr_groups[] = {
	&aoe_attr_group,
	NULL,
};

static const struct file_operations aoe_debugfs_fops = {
	.open = aoe_debugfs_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static void
aoedisk_add_debugfs(struct aoedev *d)
{
	char *p;

	if (aoe_debugfs_dir == NULL)
		return;
	p = strchr(d->gd->disk_name, '/');
	if (p == NULL)
		p = d->gd->disk_name;
	else
		p++;
	BUG_ON(*p == '\0');
	d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
					 &aoe_debugfs_fops);
}
void
aoedisk_rm_debugfs(struct aoedev *d)
{
	debugfs_remove(d->debugfs);
	d->debugfs = NULL;
}

static int
aoeblk_open(struct block_device *bdev, fmode_t mode)
{
	struct aoedev *d = bdev->bd_disk->private_data;
	ulong flags;

	if (!virt_addr_valid(d)) {
		pr_crit("aoe: invalid device pointer in %s\n",
			__func__);
		WARN_ON(1);
		return -ENODEV;
	}
	if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
		return -ENODEV;

	mutex_lock(&aoeblk_mutex);
	spin_lock_irqsave(&d->lock, flags);
	if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
		d->nopen++;
		spin_unlock_irqrestore(&d->lock, flags);
		mutex_unlock(&aoeblk_mutex);
		return 0;
	}
	spin_unlock_irqrestore(&d->lock, flags);
	mutex_unlock(&aoeblk_mutex);
	return -ENODEV;
}

static void
aoeblk_release(struct gendisk *disk, fmode_t mode)
{
	struct aoedev *d = disk->private_data;
	ulong flags;

	spin_lock_irqsave(&d->lock, flags);

	if (--d->nopen == 0) {
		spin_unlock_irqrestore(&d->lock, flags);
		aoecmd_cfg(d->aoemajor, d->aoeminor);
		return;
	}
	spin_unlock_irqrestore(&d->lock, flags);
}

static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx,
				    const struct blk_mq_queue_data *bd)
{
	struct aoedev *d = hctx->queue->queuedata;

	spin_lock_irq(&d->lock);

	if ((d->flags & DEVFL_UP) == 0) {
		pr_info_ratelimited("aoe: device %ld.%d is not up\n",
			d->aoemajor, d->aoeminor);
		spin_unlock_irq(&d->lock);
		blk_mq_start_request(bd->rq);
		return BLK_STS_IOERR;
	}

	list_add_tail(&bd->rq->queuelist, &d->rq_list);
	aoecmd_work(d);
	spin_unlock_irq(&d->lock);
	return BLK_STS_OK;
}

static int
aoeblk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct aoedev *d = bdev->bd_disk->private_data;

	if ((d->flags & DEVFL_UP) == 0) {
		printk(KERN_ERR "aoe: disk not up\n");
		return -ENODEV;
	}

	geo->cylinders = d->geo.cylinders;
	geo->heads = d->geo.heads;
	geo->sectors = d->geo.sectors;
	return 0;
}

static int
aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
{
	struct aoedev *d;

	if (!arg)
		return -EINVAL;

	d = bdev->bd_disk->private_data;
	if ((d->flags & DEVFL_UP) == 0) {
		pr_err("aoe: disk not up\n");
		return -ENODEV;
	}

	if (cmd == HDIO_GET_IDENTITY) {
		if (!copy_to_user((void __user *) arg, &d->ident,
			sizeof(d->ident)))
			return 0;
		return -EFAULT;
	}

	/* udev calls scsi_id, which uses SG_IO, resulting in noise */
	if (cmd != SG_IO)
		pr_info("aoe: unknown ioctl 0x%x\n", cmd);

	return -ENOTTY;
}

static const struct block_device_operations aoe_bdops = {
	.open = aoeblk_open,
	.release = aoeblk_release,
	.ioctl = aoeblk_ioctl,
	.getgeo = aoeblk_getgeo,
	.owner = THIS_MODULE,
};

static const struct blk_mq_ops aoeblk_mq_ops = {
	.queue_rq	= aoeblk_queue_rq,
};

/* alloc_disk and add_disk can sleep */
void
aoeblk_gdalloc(void *vp)
{
	struct aoedev *d = vp;
	struct gendisk *gd;
	mempool_t *mp;
	struct request_queue *q;
	struct blk_mq_tag_set *set;
	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
	ulong flags;
	int late = 0;
	int err;

	spin_lock_irqsave(&d->lock, flags);
	if (d->flags & DEVFL_GDALLOC
	&& !(d->flags & DEVFL_TKILL)
	&& !(d->flags & DEVFL_GD_NOW))
		d->flags |= DEVFL_GD_NOW;
	else
		late = 1;
	spin_unlock_irqrestore(&d->lock, flags);
	if (late)
		return;

	gd = alloc_disk(AOE_PARTITIONS);
	if (gd == NULL) {
		pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		goto err;
	}

	mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
		buf_pool_cache);
	if (mp == NULL) {
		printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		goto err_disk;
	}

	set = &d->tag_set;
	set->ops = &aoeblk_mq_ops;
	set->cmd_size = sizeof(struct aoe_req);
	set->nr_hw_queues = 1;
	set->queue_depth = 128;
	set->numa_node = NUMA_NO_NODE;
	set->flags = BLK_MQ_F_SHOULD_MERGE;
	err = blk_mq_alloc_tag_set(set);
	if (err) {
		pr_err("aoe: cannot allocate tag set for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		goto err_mempool;
	}

	q = blk_mq_init_queue(set);
	if (IS_ERR(q)) {
		pr_err("aoe: cannot allocate block queue for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		blk_mq_free_tag_set(set);
		goto err_mempool;
	}

	spin_lock_irqsave(&d->lock, flags);
	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	WARN_ON(!(d->flags & DEVFL_GDALLOC));
	WARN_ON(d->flags & DEVFL_TKILL);
	WARN_ON(d->gd);
	WARN_ON(d->flags & DEVFL_UP);
	blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
	q->backing_dev_info->name = "aoe";
	q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE;
	d->bufpool = mp;
	d->blkq = gd->queue = q;
	q->queuedata = d;
	d->gd = gd;
	if (aoe_maxsectors)
		blk_queue_max_hw_sectors(q, aoe_maxsectors);
	gd->major = AOE_MAJOR;
	gd->first_minor = d->sysminor;
	gd->fops = &aoe_bdops;
	gd->private_data = d;
	set_capacity(gd, d->ssize);
	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
		d->aoemajor, d->aoeminor);

	d->flags &= ~DEVFL_GDALLOC;
	d->flags |= DEVFL_UP;

	spin_unlock_irqrestore(&d->lock, flags);

	device_add_disk(NULL, gd, aoe_attr_groups);
	aoedisk_add_debugfs(d);

	spin_lock_irqsave(&d->lock, flags);
	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	d->flags &= ~DEVFL_GD_NOW;
	spin_unlock_irqrestore(&d->lock, flags);
	return;

err_mempool:
	mempool_destroy(mp);
err_disk:
	put_disk(gd);
err:
	spin_lock_irqsave(&d->lock, flags);
	d->flags &= ~DEVFL_GD_NOW;
	schedule_work(&d->work);
	spin_unlock_irqrestore(&d->lock, flags);
}

void
aoeblk_exit(void)
{
	debugfs_remove_recursive(aoe_debugfs_dir);
	aoe_debugfs_dir = NULL;
	kmem_cache_destroy(buf_pool_cache);
}

int __init
aoeblk_init(void)
{
	buf_pool_cache = kmem_cache_create("aoe_bufs",
					   sizeof(struct buf),
					   0, 0, NULL);
	if (buf_pool_cache == NULL)
		return -ENOMEM;
	aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
	return 0;
}
Commit	Line	Data
	1	/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
	2	/*
	3	* aoeblk.c
	4	* block device routines
	5	*/
	6
	7	#include <linux/kernel.h>
	8	#include <linux/hdreg.h>
	9	#include <linux/blk-mq.h>
	10	#include <linux/backing-dev.h>
	11	#include <linux/fs.h>
	12	#include <linux/ioctl.h>
	13	#include <linux/slab.h>
	14	#include <linux/ratelimit.h>
	15	#include <linux/genhd.h>
	16	#include <linux/netdevice.h>
	17	#include <linux/mutex.h>
	18	#include <linux/export.h>
	19	#include <linux/moduleparam.h>
	20	#include <linux/debugfs.h>
	21	#include <scsi/sg.h>
	22	#include "aoe.h"
	23
	24	static DEFINE_MUTEX(aoeblk_mutex);
	25	static struct kmem_cache *buf_pool_cache;
	26	static struct dentry *aoe_debugfs_dir;
	27
	28	/* GPFS needs a larger value than the default. */
	29	static int aoe_maxsectors;
	30	module_param(aoe_maxsectors, int, 0644);
	31	MODULE_PARM_DESC(aoe_maxsectors,
	32	"When nonzero, set the maximum number of sectors per I/O request");
	33
	34	static ssize_t aoedisk_show_state(struct device *dev,
	35	struct device_attribute attr, char page)
	36	{
	37	struct gendisk *disk = dev_to_disk(dev);
	38	struct aoedev *d = disk->private_data;
	39
	40	return snprintf(page, PAGE_SIZE,
	41	"%s%s\n",
	42	(d->flags & DEVFL_UP) ? "up" : "down",
	43	(d->flags & DEVFL_KICKME) ? ",kickme" :
	44	(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
	45	/* I'd rather see nopen exported so we can ditch closewait */
	46	}
	47	static ssize_t aoedisk_show_mac(struct device *dev,
	48	struct device_attribute attr, char page)
	49	{
	50	struct gendisk *disk = dev_to_disk(dev);
	51	struct aoedev *d = disk->private_data;
	52	struct aoetgt *t = d->targets[0];
	53
	54	if (t == NULL)
	55	return snprintf(page, PAGE_SIZE, "none\n");
	56	return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
	57	}
	58	static ssize_t aoedisk_show_netif(struct device *dev,
	59	struct device_attribute attr, char page)
	60	{
	61	struct gendisk *disk = dev_to_disk(dev);
	62	struct aoedev *d = disk->private_data;
	63	struct net_device nds[8], nd, nnd, *ne;
	64	struct aoetgt t, te;
	65	struct aoeif ifp, e;
	66	char *p;
	67
	68	memset(nds, 0, sizeof nds);
	69	nd = nds;
	70	ne = nd + ARRAY_SIZE(nds);
	71	t = d->targets;
	72	te = t + d->ntargets;
	73	for (; t < te && *t; t++) {
	74	ifp = (*t)->ifs;
	75	e = ifp + NAOEIFS;
	76	for (; ifp < e && ifp->nd; ifp++) {
	77	for (nnd = nds; nnd < nd; nnd++)
	78	if (*nnd == ifp->nd)
	79	break;
	80	if (nnd == nd && nd != ne)
	81	*nd++ = ifp->nd;
	82	}
	83	}
	84
	85	ne = nd;
	86	nd = nds;
	87	if (*nd == NULL)
	88	return snprintf(page, PAGE_SIZE, "none\n");
	89	for (p = page; nd < ne; nd++)
	90	p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
	91	p == page ? "" : ",", (*nd)->name);
	92	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
	93	return p-page;
	94	}
	95	/* firmware version */
	96	static ssize_t aoedisk_show_fwver(struct device *dev,
	97	struct device_attribute attr, char page)
	98	{
	99	struct gendisk *disk = dev_to_disk(dev);
	100	struct aoedev *d = disk->private_data;
	101
	102	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
	103	}
	104	static ssize_t aoedisk_show_payload(struct device *dev,
	105	struct device_attribute attr, char page)
	106	{
	107	struct gendisk *disk = dev_to_disk(dev);
	108	struct aoedev *d = disk->private_data;
	109
	110	return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
	111	}
	112
	113	static int aoedisk_debugfs_show(struct seq_file s, void ignored)
	114	{
	115	struct aoedev *d;
	116	struct aoetgt t, te;
	117	struct aoeif ifp, ife;
	118	unsigned long flags;
	119	char c;
	120
	121	d = s->private;
	122	seq_printf(s, "rttavg: %d rttdev: %d\n",
	123	d->rttavg >> RTTSCALE,
	124	d->rttdev >> RTTDSCALE);
	125	seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool));
	126	seq_printf(s, "kicked: %ld\n", d->kicked);
	127	seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt);
	128	seq_printf(s, "ref: %ld\n", d->ref);
	129
	130	spin_lock_irqsave(&d->lock, flags);
	131	t = d->targets;
	132	te = t + d->ntargets;
	133	for (; t < te && *t; t++) {
	134	c = '\t';
	135	seq_printf(s, "falloc: %ld\n", (*t)->falloc);
	136	seq_printf(s, "ffree: %p\n",
	137	list_empty(&(t)->ffree) ? NULL : (t)->ffree.next);
	138	seq_printf(s, "%pm:%d:%d:%d\n", (t)->addr, (t)->nout,
	139	(t)->maxout, (t)->nframes);
	140	seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh);
	141	seq_printf(s, "\ttaint:%d\n", (*t)->taint);
	142	seq_printf(s, "\tr:%d\n", (*t)->rpkts);
	143	seq_printf(s, "\tw:%d\n", (*t)->wpkts);
	144	ifp = (*t)->ifs;
	145	ife = ifp + ARRAY_SIZE((*t)->ifs);
	146	for (; ifp->nd && ifp < ife; ifp++) {
	147	seq_printf(s, "%c%s", c, ifp->nd->name);
	148	c = ',';
	149	}
	150	seq_puts(s, "\n");
	151	}
	152	spin_unlock_irqrestore(&d->lock, flags);
	153
	154	return 0;
	155	}
	156
	157	static int aoe_debugfs_open(struct inode inode, struct file file)
	158	{
	159	return single_open(file, aoedisk_debugfs_show, inode->i_private);
	160	}
	161
	162	static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL);
	163	static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL);
	164	static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL);
	165	static struct device_attribute dev_attr_firmware_version = {
	166	.attr = { .name = "firmware-version", .mode = 0444 },
	167	.show = aoedisk_show_fwver,
	168	};
	169	static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL);
	170
	171	static struct attribute *aoe_attrs[] = {
	172	&dev_attr_state.attr,
	173	&dev_attr_mac.attr,
	174	&dev_attr_netif.attr,
	175	&dev_attr_firmware_version.attr,
	176	&dev_attr_payload.attr,
	177	NULL,
	178	};
	179
	180	static const struct attribute_group aoe_attr_group = {
	181	.attrs = aoe_attrs,
	182	};
	183
	184	static const struct attribute_group *aoe_attr_groups[] = {
	185	&aoe_attr_group,
	186	NULL,
	187	};
	188
	189	static const struct file_operations aoe_debugfs_fops = {
	190	.open = aoe_debugfs_open,
	191	.read = seq_read,
	192	.llseek = seq_lseek,
	193	.release = single_release,
	194	};
	195
	196	static void
	197	aoedisk_add_debugfs(struct aoedev *d)
	198	{
	199	char *p;
	200
	201	if (aoe_debugfs_dir == NULL)
	202	return;
	203	p = strchr(d->gd->disk_name, '/');
	204	if (p == NULL)
	205	p = d->gd->disk_name;
	206	else
	207	p++;
	208	BUG_ON(*p == '\0');
	209	d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
	210	&aoe_debugfs_fops);
	211	}
	212	void
	213	aoedisk_rm_debugfs(struct aoedev *d)
	214	{
	215	debugfs_remove(d->debugfs);
	216	d->debugfs = NULL;
	217	}
	218
	219	static int
	220	aoeblk_open(struct block_device *bdev, fmode_t mode)
	221	{
	222	struct aoedev *d = bdev->bd_disk->private_data;
	223	ulong flags;
	224
	225	if (!virt_addr_valid(d)) {
	226	pr_crit("aoe: invalid device pointer in %s\n",
	227	__func__);
	228	WARN_ON(1);
	229	return -ENODEV;
	230	}
	231	if (!(d->flags & DEVFL_UP) \|\| d->flags & DEVFL_TKILL)
	232	return -ENODEV;
	233
	234	mutex_lock(&aoeblk_mutex);
	235	spin_lock_irqsave(&d->lock, flags);
	236	if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
	237	d->nopen++;
	238	spin_unlock_irqrestore(&d->lock, flags);
	239	mutex_unlock(&aoeblk_mutex);
	240	return 0;
	241	}
	242	spin_unlock_irqrestore(&d->lock, flags);
	243	mutex_unlock(&aoeblk_mutex);
	244	return -ENODEV;
	245	}
	246
	247	static void
	248	aoeblk_release(struct gendisk *disk, fmode_t mode)
	249	{
	250	struct aoedev *d = disk->private_data;
	251	ulong flags;
	252
	253	spin_lock_irqsave(&d->lock, flags);
	254
	255	if (--d->nopen == 0) {
	256	spin_unlock_irqrestore(&d->lock, flags);
	257	aoecmd_cfg(d->aoemajor, d->aoeminor);
	258	return;
	259	}
	260	spin_unlock_irqrestore(&d->lock, flags);
	261	}
	262
	263	static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx,
	264	const struct blk_mq_queue_data *bd)
	265	{
	266	struct aoedev *d = hctx->queue->queuedata;
	267
	268	spin_lock_irq(&d->lock);
	269
	270	if ((d->flags & DEVFL_UP) == 0) {
	271	pr_info_ratelimited("aoe: device %ld.%d is not up\n",
	272	d->aoemajor, d->aoeminor);
	273	spin_unlock_irq(&d->lock);
	274	blk_mq_start_request(bd->rq);
	275	return BLK_STS_IOERR;
	276	}
	277
	278	list_add_tail(&bd->rq->queuelist, &d->rq_list);
	279	aoecmd_work(d);
	280	spin_unlock_irq(&d->lock);
	281	return BLK_STS_OK;
	282	}
	283
	284	static int
	285	aoeblk_getgeo(struct block_device bdev, struct hd_geometry geo)
	286	{
	287	struct aoedev *d = bdev->bd_disk->private_data;
	288
	289	if ((d->flags & DEVFL_UP) == 0) {
	290	printk(KERN_ERR "aoe: disk not up\n");
	291	return -ENODEV;
	292	}
	293
	294	geo->cylinders = d->geo.cylinders;
	295	geo->heads = d->geo.heads;
	296	geo->sectors = d->geo.sectors;
	297	return 0;
	298	}
	299
	300	static int
	301	aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
	302	{
	303	struct aoedev *d;
	304
	305	if (!arg)
	306	return -EINVAL;
	307
	308	d = bdev->bd_disk->private_data;
	309	if ((d->flags & DEVFL_UP) == 0) {
	310	pr_err("aoe: disk not up\n");
	311	return -ENODEV;
	312	}
	313
	314	if (cmd == HDIO_GET_IDENTITY) {
	315	if (!copy_to_user((void __user *) arg, &d->ident,
	316	sizeof(d->ident)))
	317	return 0;
	318	return -EFAULT;
	319	}
	320
	321	/* udev calls scsi_id, which uses SG_IO, resulting in noise */
	322	if (cmd != SG_IO)
	323	pr_info("aoe: unknown ioctl 0x%x\n", cmd);
	324
	325	return -ENOTTY;
	326	}
	327
	328	static const struct block_device_operations aoe_bdops = {
	329	.open = aoeblk_open,
	330	.release = aoeblk_release,
	331	.ioctl = aoeblk_ioctl,
	332	.getgeo = aoeblk_getgeo,
	333	.owner = THIS_MODULE,
	334	};
	335
	336	static const struct blk_mq_ops aoeblk_mq_ops = {
	337	.queue_rq = aoeblk_queue_rq,
	338	};
	339
	340	/* alloc_disk and add_disk can sleep */
	341	void
	342	aoeblk_gdalloc(void *vp)
	343	{
	344	struct aoedev *d = vp;
	345	struct gendisk *gd;
	346	mempool_t *mp;
	347	struct request_queue *q;
	348	struct blk_mq_tag_set *set;
	349	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
	350	ulong flags;
	351	int late = 0;
	352	int err;
	353
	354	spin_lock_irqsave(&d->lock, flags);
	355	if (d->flags & DEVFL_GDALLOC
	356	&& !(d->flags & DEVFL_TKILL)
	357	&& !(d->flags & DEVFL_GD_NOW))
	358	d->flags \|= DEVFL_GD_NOW;
	359	else
	360	late = 1;
	361	spin_unlock_irqrestore(&d->lock, flags);
	362	if (late)
	363	return;
	364
	365	gd = alloc_disk(AOE_PARTITIONS);
	366	if (gd == NULL) {
	367	pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
	368	d->aoemajor, d->aoeminor);
	369	goto err;
	370	}
	371
	372	mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
	373	buf_pool_cache);
	374	if (mp == NULL) {
	375	printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
	376	d->aoemajor, d->aoeminor);
	377	goto err_disk;
	378	}
	379
	380	set = &d->tag_set;
	381	set->ops = &aoeblk_mq_ops;
	382	set->cmd_size = sizeof(struct aoe_req);
	383	set->nr_hw_queues = 1;
	384	set->queue_depth = 128;
	385	set->numa_node = NUMA_NO_NODE;
	386	set->flags = BLK_MQ_F_SHOULD_MERGE;
	387	err = blk_mq_alloc_tag_set(set);
	388	if (err) {
	389	pr_err("aoe: cannot allocate tag set for %ld.%d\n",
	390	d->aoemajor, d->aoeminor);
	391	goto err_mempool;
	392	}
	393
	394	q = blk_mq_init_queue(set);
	395	if (IS_ERR(q)) {
	396	pr_err("aoe: cannot allocate block queue for %ld.%d\n",
	397	d->aoemajor, d->aoeminor);
	398	blk_mq_free_tag_set(set);
	399	goto err_mempool;
	400	}
	401
	402	spin_lock_irqsave(&d->lock, flags);
	403	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	404	WARN_ON(!(d->flags & DEVFL_GDALLOC));
	405	WARN_ON(d->flags & DEVFL_TKILL);
	406	WARN_ON(d->gd);
	407	WARN_ON(d->flags & DEVFL_UP);
	408	blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
	409	q->backing_dev_info->name = "aoe";
	410	q->backing_dev_info->ra_pages = READ_AHEAD / PAGE_SIZE;
	411	d->bufpool = mp;
	412	d->blkq = gd->queue = q;
	413	q->queuedata = d;
	414	d->gd = gd;
	415	if (aoe_maxsectors)
	416	blk_queue_max_hw_sectors(q, aoe_maxsectors);
	417	gd->major = AOE_MAJOR;
	418	gd->first_minor = d->sysminor;
	419	gd->fops = &aoe_bdops;
	420	gd->private_data = d;
	421	set_capacity(gd, d->ssize);
	422	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
	423	d->aoemajor, d->aoeminor);
	424
	425	d->flags &= ~DEVFL_GDALLOC;
	426	d->flags \|= DEVFL_UP;
	427
	428	spin_unlock_irqrestore(&d->lock, flags);
	429
	430	device_add_disk(NULL, gd, aoe_attr_groups);
	431	aoedisk_add_debugfs(d);
	432
	433	spin_lock_irqsave(&d->lock, flags);
	434	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	435	d->flags &= ~DEVFL_GD_NOW;
	436	spin_unlock_irqrestore(&d->lock, flags);
	437	return;
	438
	439	err_mempool:
	440	mempool_destroy(mp);
	441	err_disk:
	442	put_disk(gd);
	443	err:
	444	spin_lock_irqsave(&d->lock, flags);
	445	d->flags &= ~DEVFL_GD_NOW;
	446	schedule_work(&d->work);
	447	spin_unlock_irqrestore(&d->lock, flags);
	448	}
	449
	450	void
	451	aoeblk_exit(void)
	452	{
	453	debugfs_remove_recursive(aoe_debugfs_dir);
	454	aoe_debugfs_dir = NULL;
	455	kmem_cache_destroy(buf_pool_cache);
	456	}
	457
	458	int __init
	459	aoeblk_init(void)
	460	{
	461	buf_pool_cache = kmem_cache_create("aoe_bufs",
	462	sizeof(struct buf),
	463	0, 0, NULL);
	464	if (buf_pool_cache == NULL)
	465	return -ENOMEM;
	466	aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
	467	return 0;
	468	}
	469