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

/* Copyright (c) 2012 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoeblk.c
 * block device routines
 */

#include <linux/kernel.h>
#include <linux/hdreg.h>
#include <linux/blkdev.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 <scsi/sg.h>
#include "aoe.h"

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

/* 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 DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
static struct device_attribute dev_attr_firmware_version = {
	.attr = { .name = "firmware-version", .mode = S_IRUGO },
	.show = aoedisk_show_fwver,
};
static DEVICE_ATTR(payload, S_IRUGO, 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 attr_group = {
	.attrs = aoe_attrs,
};

static int
aoedisk_add_sysfs(struct aoedev *d)
{
	return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
	sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
}

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 int
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 0;
	}
	spin_unlock_irqrestore(&d->lock, flags);

	return 0;
}

static void
aoeblk_request(struct request_queue *q)
{
	struct aoedev *d;
	struct request *rq;

	d = q->queuedata;
	if ((d->flags & DEVFL_UP) == 0) {
		pr_info_ratelimited("aoe: device %ld.%d is not up\n",
			d->aoemajor, d->aoeminor);
		while ((rq = blk_peek_request(q))) {
			blk_start_request(rq);
			aoe_end_request(d, rq, 1);
		}
		return;
	}
	aoecmd_work(d);
}

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,
};

/* 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;
	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
	ulong flags;
	int late = 0;

	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;
	}
	q = blk_init_queue(aoeblk_request, &d->lock);
	if (q == NULL) {
		pr_err("aoe: cannot allocate block queue for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		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_CACHE_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);

	add_disk(gd);
	aoedisk_add_sysfs(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)
{
	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;

	return 0;
}
Commit	Line	Data
fea05a26	1	/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
1da177e4 LT	2	/*
	3	* aoeblk.c
	4	* block device routines
	5	*/
	6
027b180d	7	#include <linux/kernel.h>
1da177e4 LT	8	#include <linux/hdreg.h>
1da177e4 LT	9	#include <linux/blkdev.h>
43cbe2cb	10	#include <linux/backing-dev.h>
1da177e4 LT	11	#include <linux/fs.h>
1da177e4 LT	12	#include <linux/ioctl.h>
5a0e3ad6	13	#include <linux/slab.h>
027b180d	14	#include <linux/ratelimit.h>
1da177e4 LT	15	#include <linux/genhd.h>
1da177e4 LT	16	#include <linux/netdevice.h>
2a48fc0a	17	#include <linux/mutex.h>
d5decd3b	18	#include <linux/export.h>
aa304fde	19	#include <linux/moduleparam.h>
667be1e7	20	#include <scsi/sg.h>
1da177e4 LT	21	#include "aoe.h"
1da177e4 LT	22
2a48fc0a	23	static DEFINE_MUTEX(aoeblk_mutex);
e18b890b	24	static struct kmem_cache *buf_pool_cache;
1da177e4	25
aa304fde EC	26	/* GPFS needs a larger value than the default. */
	27	static int aoe_maxsectors;
	28	module_param(aoe_maxsectors, int, 0644);
	29	MODULE_PARM_DESC(aoe_maxsectors,
	30	"When nonzero, set the maximum number of sectors per I/O request");
	31
edfaa7c3 KS	32	static ssize_t aoedisk_show_state(struct device *dev,
edfaa7c3 KS	33	struct device_attribute attr, char page)
1da177e4	34	{
edfaa7c3	35	struct gendisk *disk = dev_to_disk(dev);
1da177e4 LT	36	struct aoedev *d = disk->private_data;
	37
	38	return snprintf(page, PAGE_SIZE,
	39	"%s%s\n",
	40	(d->flags & DEVFL_UP) ? "up" : "down",
68e0d42f	41	(d->flags & DEVFL_KICKME) ? ",kickme" :
3ae1c24e EC	42	(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
3ae1c24e EC	43	/* I'd rather see nopen exported so we can ditch closewait */
1da177e4	44	}
edfaa7c3 KS	45	static ssize_t aoedisk_show_mac(struct device *dev,
edfaa7c3 KS	46	struct device_attribute attr, char page)
1da177e4	47	{
edfaa7c3	48	struct gendisk *disk = dev_to_disk(dev);
1da177e4	49	struct aoedev *d = disk->private_data;
68e0d42f	50	struct aoetgt *t = d->targets[0];
1da177e4	51
68e0d42f EC	52	if (t == NULL)
68e0d42f EC	53	return snprintf(page, PAGE_SIZE, "none\n");
411c41ee	54	return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
1da177e4	55	}
edfaa7c3 KS	56	static ssize_t aoedisk_show_netif(struct device *dev,
edfaa7c3 KS	57	struct device_attribute attr, char page)
1da177e4	58	{
edfaa7c3	59	struct gendisk *disk = dev_to_disk(dev);
1da177e4	60	struct aoedev *d = disk->private_data;
68e0d42f EC	61	struct net_device nds[8], nd, nnd, *ne;
	62	struct aoetgt t, te;
	63	struct aoeif ifp, e;
	64	char *p;
	65
	66	memset(nds, 0, sizeof nds);
	67	nd = nds;
	68	ne = nd + ARRAY_SIZE(nds);
	69	t = d->targets;
71114ec4	70	te = t + d->ntargets;
68e0d42f EC	71	for (; t < te && *t; t++) {
	72	ifp = (*t)->ifs;
	73	e = ifp + NAOEIFS;
	74	for (; ifp < e && ifp->nd; ifp++) {
	75	for (nnd = nds; nnd < nd; nnd++)
	76	if (*nnd == ifp->nd)
	77	break;
	78	if (nnd == nd && nd != ne)
	79	*nd++ = ifp->nd;
	80	}
	81	}
1da177e4	82
68e0d42f EC	83	ne = nd;
	84	nd = nds;
	85	if (*nd == NULL)
	86	return snprintf(page, PAGE_SIZE, "none\n");
	87	for (p = page; nd < ne; nd++)
	88	p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
	89	p == page ? "" : ",", (*nd)->name);
	90	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
	91	return p-page;
1da177e4	92	}
4613ed27	93	/* firmware version */
edfaa7c3 KS	94	static ssize_t aoedisk_show_fwver(struct device *dev,
edfaa7c3 KS	95	struct device_attribute attr, char page)
4613ed27	96	{
edfaa7c3	97	struct gendisk *disk = dev_to_disk(dev);
4613ed27 EC	98	struct aoedev *d = disk->private_data;
	99
	100	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
	101	}
90a2508d EC	102	static ssize_t aoedisk_show_payload(struct device *dev,
	103	struct device_attribute attr, char page)
	104	{
	105	struct gendisk *disk = dev_to_disk(dev);
	106	struct aoedev *d = disk->private_data;
	107
	108	return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
	109	}
1da177e4	110
edfaa7c3 KS	111	static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
	112	static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
	113	static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
	114	static struct device_attribute dev_attr_firmware_version = {
01e8ef11	115	.attr = { .name = "firmware-version", .mode = S_IRUGO },
edfaa7c3	116	.show = aoedisk_show_fwver,
4613ed27	117	};
90a2508d	118	static DEVICE_ATTR(payload, S_IRUGO, aoedisk_show_payload, NULL);
1da177e4	119
4ca5224f	120	static struct attribute *aoe_attrs[] = {
edfaa7c3 KS	121	&dev_attr_state.attr,
	122	&dev_attr_mac.attr,
	123	&dev_attr_netif.attr,
	124	&dev_attr_firmware_version.attr,
90a2508d	125	&dev_attr_payload.attr,
edfaa7c3	126	NULL,
4ca5224f GKH	127	};
	128
	129	static const struct attribute_group attr_group = {
	130	.attrs = aoe_attrs,
	131	};
	132
	133	static int
1da177e4 LT	134	aoedisk_add_sysfs(struct aoedev *d)
1da177e4 LT	135	{
ed9e1982	136	return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
1da177e4 LT	137	}
	138	void
	139	aoedisk_rm_sysfs(struct aoedev *d)
	140	{
ed9e1982	141	sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
1da177e4 LT	142	}
	143
	144	static int
94562c17	145	aoeblk_open(struct block_device *bdev, fmode_t mode)
1da177e4	146	{
94562c17	147	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4 LT	148	ulong flags;
1da177e4 LT	149
e52a2932 EC	150	if (!virt_addr_valid(d)) {
	151	pr_crit("aoe: invalid device pointer in %s\n",
	152	__func__);
	153	WARN_ON(1);
	154	return -ENODEV;
	155	}
	156	if (!(d->flags & DEVFL_UP) \|\| d->flags & DEVFL_TKILL)
	157	return -ENODEV;
	158
2a48fc0a	159	mutex_lock(&aoeblk_mutex);
1da177e4	160	spin_lock_irqsave(&d->lock, flags);
e52a2932	161	if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
1da177e4 LT	162	d->nopen++;
1da177e4 LT	163	spin_unlock_irqrestore(&d->lock, flags);
2a48fc0a	164	mutex_unlock(&aoeblk_mutex);
1da177e4 LT	165	return 0;
	166	}
	167	spin_unlock_irqrestore(&d->lock, flags);
2a48fc0a	168	mutex_unlock(&aoeblk_mutex);
1da177e4 LT	169	return -ENODEV;
	170	}
	171
	172	static int
94562c17	173	aoeblk_release(struct gendisk *disk, fmode_t mode)
1da177e4	174	{
94562c17	175	struct aoedev *d = disk->private_data;
1da177e4 LT	176	ulong flags;
1da177e4 LT	177
1da177e4 LT	178	spin_lock_irqsave(&d->lock, flags);
1da177e4 LT	179
5f7702fd	180	if (--d->nopen == 0) {
1da177e4 LT	181	spin_unlock_irqrestore(&d->lock, flags);
	182	aoecmd_cfg(d->aoemajor, d->aoeminor);
	183	return 0;
	184	}
	185	spin_unlock_irqrestore(&d->lock, flags);
	186
	187	return 0;
	188	}
	189
5a7bbad2	190	static void
69cf2d85	191	aoeblk_request(struct request_queue *q)
1da177e4 LT	192	{
1da177e4 LT	193	struct aoedev *d;
69cf2d85	194	struct request *rq;
1da177e4	195
69cf2d85	196	d = q->queuedata;
1da177e4	197	if ((d->flags & DEVFL_UP) == 0) {
027b180d	198	pr_info_ratelimited("aoe: device %ld.%d is not up\n",
a12c93f0	199	d->aoemajor, d->aoeminor);
69cf2d85 EC	200	while ((rq = blk_peek_request(q))) {
	201	blk_start_request(rq);
	202	aoe_end_request(d, rq, 1);
	203	}
5a7bbad2	204	return;
1da177e4	205	}
3ae1c24e	206	aoecmd_work(d);
1da177e4 LT	207	}
1da177e4 LT	208
1da177e4	209	static int
a885c8c4	210	aoeblk_getgeo(struct block_device bdev, struct hd_geometry geo)
1da177e4	211	{
a885c8c4	212	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4	213
1da177e4	214	if ((d->flags & DEVFL_UP) == 0) {
a12c93f0	215	printk(KERN_ERR "aoe: disk not up\n");
1da177e4 LT	216	return -ENODEV;
	217	}
	218
a885c8c4 CH	219	geo->cylinders = d->geo.cylinders;
	220	geo->heads = d->geo.heads;
	221	geo->sectors = d->geo.sectors;
	222	return 0;
1da177e4 LT	223	}
1da177e4 LT	224
667be1e7 EC	225	static int
	226	aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
	227	{
	228	struct aoedev *d;
	229
	230	if (!arg)
	231	return -EINVAL;
	232
	233	d = bdev->bd_disk->private_data;
	234	if ((d->flags & DEVFL_UP) == 0) {
	235	pr_err("aoe: disk not up\n");
	236	return -ENODEV;
	237	}
	238
	239	if (cmd == HDIO_GET_IDENTITY) {
	240	if (!copy_to_user((void __user *) arg, &d->ident,
	241	sizeof(d->ident)))
	242	return 0;
	243	return -EFAULT;
	244	}
	245
	246	/* udev calls scsi_id, which uses SG_IO, resulting in noise */
	247	if (cmd != SG_IO)
	248	pr_info("aoe: unknown ioctl 0x%x\n", cmd);
	249
	250	return -ENOTTY;
	251	}
	252
83d5cde4	253	static const struct block_device_operations aoe_bdops = {
94562c17 AV	254	.open = aoeblk_open,
94562c17 AV	255	.release = aoeblk_release,
667be1e7	256	.ioctl = aoeblk_ioctl,
a885c8c4	257	.getgeo = aoeblk_getgeo,
1da177e4 LT	258	.owner = THIS_MODULE,
	259	};
	260
	261	/* alloc_disk and add_disk can sleep */
	262	void
	263	aoeblk_gdalloc(void *vp)
	264	{
	265	struct aoedev *d = vp;
	266	struct gendisk *gd;
69cf2d85 EC	267	mempool_t *mp;
	268	struct request_queue *q;
	269	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
1da177e4	270	ulong flags;
e52a2932 EC	271	int late = 0;
	272
	273	spin_lock_irqsave(&d->lock, flags);
	274	if (d->flags & DEVFL_GDALLOC
	275	&& !(d->flags & DEVFL_TKILL)
	276	&& !(d->flags & DEVFL_GD_NOW))
	277	d->flags \|= DEVFL_GD_NOW;
	278	else
	279	late = 1;
	280	spin_unlock_irqrestore(&d->lock, flags);
	281	if (late)
	282	return;
1da177e4 LT	283
	284	gd = alloc_disk(AOE_PARTITIONS);
	285	if (gd == NULL) {
69cf2d85	286	pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
6bb6285f	287	d->aoemajor, d->aoeminor);
43cbe2cb	288	goto err;
1da177e4 LT	289	}
1da177e4 LT	290
69cf2d85 EC	291	mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
	292	buf_pool_cache);
	293	if (mp == NULL) {
1d75981a	294	printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
6bb6285f	295	d->aoemajor, d->aoeminor);
43cbe2cb	296	goto err_disk;
1da177e4	297	}
69cf2d85 EC	298	q = blk_init_queue(aoeblk_request, &d->lock);
	299	if (q == NULL) {
	300	pr_err("aoe: cannot allocate block queue for %ld.%d\n",
	301	d->aoemajor, d->aoeminor);
0a41409c	302	goto err_mempool;
69cf2d85	303	}
1da177e4	304
43cbe2cb	305	spin_lock_irqsave(&d->lock, flags);
e52a2932 EC	306	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	307	WARN_ON(!(d->flags & DEVFL_GDALLOC));
	308	WARN_ON(d->flags & DEVFL_TKILL);
	309	WARN_ON(d->gd);
	310	WARN_ON(d->flags & DEVFL_UP);
0a41409c EC	311	blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
0a41409c EC	312	q->backing_dev_info.name = "aoe";
69cf2d85 EC	313	q->backing_dev_info.ra_pages = READ_AHEAD / PAGE_CACHE_SIZE;
	314	d->bufpool = mp;
	315	d->blkq = gd->queue = q;
	316	q->queuedata = d;
	317	d->gd = gd;
aa304fde EC	318	if (aoe_maxsectors)
aa304fde EC	319	blk_queue_max_hw_sectors(q, aoe_maxsectors);
1da177e4	320	gd->major = AOE_MAJOR;
0c966214	321	gd->first_minor = d->sysminor;
1da177e4 LT	322	gd->fops = &aoe_bdops;
1da177e4 LT	323	gd->private_data = d;
80795aef	324	set_capacity(gd, d->ssize);
68e0d42f	325	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
1da177e4 LT	326	d->aoemajor, d->aoeminor);
1da177e4 LT	327
3ae1c24e	328	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	329	d->flags \|= DEVFL_UP;
	330
	331	spin_unlock_irqrestore(&d->lock, flags);
	332
	333	add_disk(gd);
	334	aoedisk_add_sysfs(d);
e52a2932 EC	335
	336	spin_lock_irqsave(&d->lock, flags);
	337	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	338	d->flags &= ~DEVFL_GD_NOW;
	339	spin_unlock_irqrestore(&d->lock, flags);
43cbe2cb AM	340	return;
	341
	342	err_mempool:
0a41409c	343	mempool_destroy(mp);
43cbe2cb AM	344	err_disk:
	345	put_disk(gd);
	346	err:
	347	spin_lock_irqsave(&d->lock, flags);
e52a2932 EC	348	d->flags &= ~DEVFL_GD_NOW;
e52a2932 EC	349	schedule_work(&d->work);
43cbe2cb	350	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	351	}
	352
	353	void
	354	aoeblk_exit(void)
	355	{
	356	kmem_cache_destroy(buf_pool_cache);
	357	}
	358
	359	int __init
	360	aoeblk_init(void)
	361	{
20c2df83	362	buf_pool_cache = kmem_cache_create("aoe_bufs",
1da177e4	363	sizeof(struct buf),
20c2df83	364	0, 0, NULL);
1da177e4 LT	365	if (buf_pool_cache == NULL)
	366	return -ENOMEM;
	367
	368	return 0;
	369	}
	370