[net-next-2.6.git] / drivers / block / aoe / aoeblk.c

/* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoeblk.c
 * block device routines
 */

#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/genhd.h>
#include <linux/netdevice.h>
#include <linux/smp_lock.h>
#include "aoe.h"

static struct kmem_cache *buf_pool_cache;

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 + 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 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 struct attribute *aoe_attrs[] = {
	&dev_attr_state.attr,
	&dev_attr_mac.attr,
	&dev_attr_netif.attr,
	&dev_attr_firmware_version.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;

	lock_kernel();
	spin_lock_irqsave(&d->lock, flags);
	if (d->flags & DEVFL_UP) {
		d->nopen++;
		spin_unlock_irqrestore(&d->lock, flags);
		unlock_kernel();
		return 0;
	}
	spin_unlock_irqrestore(&d->lock, flags);
	unlock_kernel();
	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 int
aoeblk_make_request(struct request_queue *q, struct bio *bio)
{
	struct sk_buff_head queue;
	struct aoedev *d;
	struct buf *buf;
	ulong flags;

	blk_queue_bounce(q, &bio);

	if (bio == NULL) {
		printk(KERN_ERR "aoe: bio is NULL\n");
		BUG();
		return 0;
	}
	d = bio->bi_bdev->bd_disk->private_data;
	if (d == NULL) {
		printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
		BUG();
		bio_endio(bio, -ENXIO);
		return 0;
	} else if (bio->bi_rw & REQ_HARDBARRIER) {
		bio_endio(bio, -EOPNOTSUPP);
		return 0;
	} else if (bio->bi_io_vec == NULL) {
		printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
		BUG();
		bio_endio(bio, -ENXIO);
		return 0;
	}
	buf = mempool_alloc(d->bufpool, GFP_NOIO);
	if (buf == NULL) {
		printk(KERN_INFO "aoe: buf allocation failure\n");
		bio_endio(bio, -ENOMEM);
		return 0;
	}
	memset(buf, 0, sizeof(*buf));
	INIT_LIST_HEAD(&buf->bufs);
	buf->stime = jiffies;
	buf->bio = bio;
	buf->resid = bio->bi_size;
	buf->sector = bio->bi_sector;
	buf->bv = &bio->bi_io_vec[bio->bi_idx];
	buf->bv_resid = buf->bv->bv_len;
	WARN_ON(buf->bv_resid == 0);
	buf->bv_off = buf->bv->bv_offset;

	spin_lock_irqsave(&d->lock, flags);

	if ((d->flags & DEVFL_UP) == 0) {
		printk(KERN_INFO "aoe: device %ld.%d is not up\n",
			d->aoemajor, d->aoeminor);
		spin_unlock_irqrestore(&d->lock, flags);
		mempool_free(buf, d->bufpool);
		bio_endio(bio, -ENXIO);
		return 0;
	}

	list_add_tail(&buf->bufs, &d->bufq);

	aoecmd_work(d);
	__skb_queue_head_init(&queue);
	skb_queue_splice_init(&d->sendq, &queue);

	spin_unlock_irqrestore(&d->lock, flags);
	aoenet_xmit(&queue);

	return 0;
}

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 const struct block_device_operations aoe_bdops = {
	.open = aoeblk_open,
	.release = aoeblk_release,
	.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;
	ulong flags;

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

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

	d->blkq = blk_alloc_queue(GFP_KERNEL);
	if (!d->blkq)
		goto err_mempool;
	blk_queue_make_request(d->blkq, aoeblk_make_request);
	d->blkq->backing_dev_info.name = "aoe";
	if (bdi_init(&d->blkq->backing_dev_info))
		goto err_blkq;
	spin_lock_irqsave(&d->lock, flags);
	gd->major = AOE_MAJOR;
	gd->first_minor = d->sysminor * AOE_PARTITIONS;
	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);

	gd->queue = d->blkq;
	d->gd = gd;
	d->flags &= ~DEVFL_GDALLOC;
	d->flags |= DEVFL_UP;

	spin_unlock_irqrestore(&d->lock, flags);

	add_disk(gd);
	aoedisk_add_sysfs(d);
	return;

err_blkq:
	blk_cleanup_queue(d->blkq);
	d->blkq = NULL;
err_mempool:
	mempool_destroy(d->bufpool);
err_disk:
	put_disk(gd);
err:
	spin_lock_irqsave(&d->lock, flags);
	d->flags &= ~DEVFL_GDALLOC;
	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
52e112b3	1	/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
1da177e4 LT	2	/*
	3	* aoeblk.c
	4	* block device routines
	5	*/
	6
	7	#include <linux/hdreg.h>
	8	#include <linux/blkdev.h>
43cbe2cb	9	#include <linux/backing-dev.h>
1da177e4 LT	10	#include <linux/fs.h>
1da177e4 LT	11	#include <linux/ioctl.h>
5a0e3ad6	12	#include <linux/slab.h>
1da177e4 LT	13	#include <linux/genhd.h>
1da177e4 LT	14	#include <linux/netdevice.h>
6e9624b8	15	#include <linux/smp_lock.h>
1da177e4 LT	16	#include "aoe.h"
1da177e4 LT	17
e18b890b	18	static struct kmem_cache *buf_pool_cache;
1da177e4	19
edfaa7c3 KS	20	static ssize_t aoedisk_show_state(struct device *dev,
edfaa7c3 KS	21	struct device_attribute attr, char page)
1da177e4	22	{
edfaa7c3	23	struct gendisk *disk = dev_to_disk(dev);
1da177e4 LT	24	struct aoedev *d = disk->private_data;
	25
	26	return snprintf(page, PAGE_SIZE,
	27	"%s%s\n",
	28	(d->flags & DEVFL_UP) ? "up" : "down",
68e0d42f	29	(d->flags & DEVFL_KICKME) ? ",kickme" :
3ae1c24e EC	30	(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
3ae1c24e EC	31	/* I'd rather see nopen exported so we can ditch closewait */
1da177e4	32	}
edfaa7c3 KS	33	static ssize_t aoedisk_show_mac(struct device *dev,
edfaa7c3 KS	34	struct device_attribute attr, char page)
1da177e4	35	{
edfaa7c3	36	struct gendisk *disk = dev_to_disk(dev);
1da177e4	37	struct aoedev *d = disk->private_data;
68e0d42f	38	struct aoetgt *t = d->targets[0];
1da177e4	39
68e0d42f EC	40	if (t == NULL)
68e0d42f EC	41	return snprintf(page, PAGE_SIZE, "none\n");
411c41ee	42	return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
1da177e4	43	}
edfaa7c3 KS	44	static ssize_t aoedisk_show_netif(struct device *dev,
edfaa7c3 KS	45	struct device_attribute attr, char page)
1da177e4	46	{
edfaa7c3	47	struct gendisk *disk = dev_to_disk(dev);
1da177e4	48	struct aoedev *d = disk->private_data;
68e0d42f EC	49	struct net_device nds[8], nd, nnd, *ne;
	50	struct aoetgt t, te;
	51	struct aoeif ifp, e;
	52	char *p;
	53
	54	memset(nds, 0, sizeof nds);
	55	nd = nds;
	56	ne = nd + ARRAY_SIZE(nds);
	57	t = d->targets;
	58	te = t + NTARGETS;
	59	for (; t < te && *t; t++) {
	60	ifp = (*t)->ifs;
	61	e = ifp + NAOEIFS;
	62	for (; ifp < e && ifp->nd; ifp++) {
	63	for (nnd = nds; nnd < nd; nnd++)
	64	if (*nnd == ifp->nd)
	65	break;
	66	if (nnd == nd && nd != ne)
	67	*nd++ = ifp->nd;
	68	}
	69	}
1da177e4	70
68e0d42f EC	71	ne = nd;
	72	nd = nds;
	73	if (*nd == NULL)
	74	return snprintf(page, PAGE_SIZE, "none\n");
	75	for (p = page; nd < ne; nd++)
	76	p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
	77	p == page ? "" : ",", (*nd)->name);
	78	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
	79	return p-page;
1da177e4	80	}
4613ed27	81	/* firmware version */
edfaa7c3 KS	82	static ssize_t aoedisk_show_fwver(struct device *dev,
edfaa7c3 KS	83	struct device_attribute attr, char page)
4613ed27	84	{
edfaa7c3	85	struct gendisk *disk = dev_to_disk(dev);
4613ed27 EC	86	struct aoedev *d = disk->private_data;
	87
	88	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
	89	}
1da177e4	90
edfaa7c3 KS	91	static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
	92	static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
	93	static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
	94	static struct device_attribute dev_attr_firmware_version = {
01e8ef11	95	.attr = { .name = "firmware-version", .mode = S_IRUGO },
edfaa7c3	96	.show = aoedisk_show_fwver,
4613ed27	97	};
1da177e4	98
4ca5224f	99	static struct attribute *aoe_attrs[] = {
edfaa7c3 KS	100	&dev_attr_state.attr,
	101	&dev_attr_mac.attr,
	102	&dev_attr_netif.attr,
	103	&dev_attr_firmware_version.attr,
	104	NULL,
4ca5224f GKH	105	};
	106
	107	static const struct attribute_group attr_group = {
	108	.attrs = aoe_attrs,
	109	};
	110
	111	static int
1da177e4 LT	112	aoedisk_add_sysfs(struct aoedev *d)
1da177e4 LT	113	{
ed9e1982	114	return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
1da177e4 LT	115	}
	116	void
	117	aoedisk_rm_sysfs(struct aoedev *d)
	118	{
ed9e1982	119	sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
1da177e4 LT	120	}
	121
	122	static int
94562c17	123	aoeblk_open(struct block_device *bdev, fmode_t mode)
1da177e4	124	{
94562c17	125	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4 LT	126	ulong flags;
1da177e4 LT	127
6e9624b8	128	lock_kernel();
1da177e4 LT	129	spin_lock_irqsave(&d->lock, flags);
	130	if (d->flags & DEVFL_UP) {
	131	d->nopen++;
	132	spin_unlock_irqrestore(&d->lock, flags);
6e9624b8	133	unlock_kernel();
1da177e4 LT	134	return 0;
	135	}
	136	spin_unlock_irqrestore(&d->lock, flags);
6e9624b8	137	unlock_kernel();
1da177e4 LT	138	return -ENODEV;
	139	}
	140
	141	static int
94562c17	142	aoeblk_release(struct gendisk *disk, fmode_t mode)
1da177e4	143	{
94562c17	144	struct aoedev *d = disk->private_data;
1da177e4 LT	145	ulong flags;
1da177e4 LT	146
1da177e4 LT	147	spin_lock_irqsave(&d->lock, flags);
1da177e4 LT	148
5f7702fd	149	if (--d->nopen == 0) {
1da177e4 LT	150	spin_unlock_irqrestore(&d->lock, flags);
	151	aoecmd_cfg(d->aoemajor, d->aoeminor);
	152	return 0;
	153	}
	154	spin_unlock_irqrestore(&d->lock, flags);
	155
	156	return 0;
	157	}
	158
	159	static int
165125e1	160	aoeblk_make_request(struct request_queue q, struct bio bio)
1da177e4	161	{
e9bb8fb0	162	struct sk_buff_head queue;
1da177e4 LT	163	struct aoedev *d;
1da177e4 LT	164	struct buf *buf;
1da177e4 LT	165	ulong flags;
	166
	167	blk_queue_bounce(q, &bio);
	168
68e0d42f EC	169	if (bio == NULL) {
	170	printk(KERN_ERR "aoe: bio is NULL\n");
	171	BUG();
	172	return 0;
	173	}
1da177e4	174	d = bio->bi_bdev->bd_disk->private_data;
68e0d42f EC	175	if (d == NULL) {
	176	printk(KERN_ERR "aoe: bd_disk->private_data is NULL\n");
	177	BUG();
	178	bio_endio(bio, -ENXIO);
	179	return 0;
7b6d91da	180	} else if (bio->bi_rw & REQ_HARDBARRIER) {
18d8217b EC	181	bio_endio(bio, -EOPNOTSUPP);
18d8217b EC	182	return 0;
68e0d42f EC	183	} else if (bio->bi_io_vec == NULL) {
	184	printk(KERN_ERR "aoe: bi_io_vec is NULL\n");
	185	BUG();
	186	bio_endio(bio, -ENXIO);
	187	return 0;
	188	}
1da177e4 LT	189	buf = mempool_alloc(d->bufpool, GFP_NOIO);
1da177e4 LT	190	if (buf == NULL) {
a12c93f0	191	printk(KERN_INFO "aoe: buf allocation failure\n");
6712ecf8	192	bio_endio(bio, -ENOMEM);
1da177e4 LT	193	return 0;
	194	}
	195	memset(buf, 0, sizeof(*buf));
	196	INIT_LIST_HEAD(&buf->bufs);
68e0d42f	197	buf->stime = jiffies;
1da177e4 LT	198	buf->bio = bio;
	199	buf->resid = bio->bi_size;
	200	buf->sector = bio->bi_sector;
392e4845	201	buf->bv = &bio->bi_io_vec[bio->bi_idx];
1da177e4	202	buf->bv_resid = buf->bv->bv_len;
68e0d42f EC	203	WARN_ON(buf->bv_resid == 0);
68e0d42f EC	204	buf->bv_off = buf->bv->bv_offset;
1da177e4 LT	205
	206	spin_lock_irqsave(&d->lock, flags);
	207
	208	if ((d->flags & DEVFL_UP) == 0) {
1d75981a	209	printk(KERN_INFO "aoe: device %ld.%d is not up\n",
a12c93f0	210	d->aoemajor, d->aoeminor);
1da177e4 LT	211	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	212	mempool_free(buf, d->bufpool);
6712ecf8	213	bio_endio(bio, -ENXIO);
1da177e4 LT	214	return 0;
	215	}
	216
	217	list_add_tail(&buf->bufs, &d->bufq);
1da177e4	218
3ae1c24e	219	aoecmd_work(d);
e9bb8fb0 DM	220	__skb_queue_head_init(&queue);
e9bb8fb0 DM	221	skb_queue_splice_init(&d->sendq, &queue);
1da177e4 LT	222
1da177e4 LT	223	spin_unlock_irqrestore(&d->lock, flags);
e9bb8fb0	224	aoenet_xmit(&queue);
3ae1c24e	225
1da177e4 LT	226	return 0;
	227	}
	228
1da177e4	229	static int
a885c8c4	230	aoeblk_getgeo(struct block_device bdev, struct hd_geometry geo)
1da177e4	231	{
a885c8c4	232	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4	233
1da177e4	234	if ((d->flags & DEVFL_UP) == 0) {
a12c93f0	235	printk(KERN_ERR "aoe: disk not up\n");
1da177e4 LT	236	return -ENODEV;
	237	}
	238
a885c8c4 CH	239	geo->cylinders = d->geo.cylinders;
	240	geo->heads = d->geo.heads;
	241	geo->sectors = d->geo.sectors;
	242	return 0;
1da177e4 LT	243	}
1da177e4 LT	244
83d5cde4	245	static const struct block_device_operations aoe_bdops = {
94562c17 AV	246	.open = aoeblk_open,
94562c17 AV	247	.release = aoeblk_release,
a885c8c4	248	.getgeo = aoeblk_getgeo,
1da177e4 LT	249	.owner = THIS_MODULE,
	250	};
	251
	252	/* alloc_disk and add_disk can sleep */
	253	void
	254	aoeblk_gdalloc(void *vp)
	255	{
	256	struct aoedev *d = vp;
	257	struct gendisk *gd;
	258	ulong flags;
	259
	260	gd = alloc_disk(AOE_PARTITIONS);
	261	if (gd == NULL) {
1d75981a EC	262	printk(KERN_ERR
1d75981a EC	263	"aoe: cannot allocate disk structure for %ld.%d\n",
6bb6285f	264	d->aoemajor, d->aoeminor);
43cbe2cb	265	goto err;
1da177e4 LT	266	}
1da177e4 LT	267
93d2341c	268	d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
1da177e4	269	if (d->bufpool == NULL) {
1d75981a	270	printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
6bb6285f	271	d->aoemajor, d->aoeminor);
43cbe2cb	272	goto err_disk;
1da177e4 LT	273	}
1da177e4 LT	274
7135a71b EC	275	d->blkq = blk_alloc_queue(GFP_KERNEL);
7135a71b EC	276	if (!d->blkq)
43cbe2cb	277	goto err_mempool;
7135a71b	278	blk_queue_make_request(d->blkq, aoeblk_make_request);
d993831f	279	d->blkq->backing_dev_info.name = "aoe";
7135a71b EC	280	if (bdi_init(&d->blkq->backing_dev_info))
7135a71b EC	281	goto err_blkq;
43cbe2cb	282	spin_lock_irqsave(&d->lock, flags);
1da177e4 LT	283	gd->major = AOE_MAJOR;
	284	gd->first_minor = d->sysminor * AOE_PARTITIONS;
	285	gd->fops = &aoe_bdops;
	286	gd->private_data = d;
80795aef	287	set_capacity(gd, d->ssize);
68e0d42f	288	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
1da177e4 LT	289	d->aoemajor, d->aoeminor);
1da177e4 LT	290
7135a71b	291	gd->queue = d->blkq;
1da177e4	292	d->gd = gd;
3ae1c24e	293	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	294	d->flags \|= DEVFL_UP;
	295
	296	spin_unlock_irqrestore(&d->lock, flags);
	297
	298	add_disk(gd);
	299	aoedisk_add_sysfs(d);
43cbe2cb AM	300	return;
43cbe2cb AM	301
7135a71b EC	302	err_blkq:
	303	blk_cleanup_queue(d->blkq);
	304	d->blkq = NULL;
43cbe2cb AM	305	err_mempool:
	306	mempool_destroy(d->bufpool);
	307	err_disk:
	308	put_disk(gd);
	309	err:
	310	spin_lock_irqsave(&d->lock, flags);
	311	d->flags &= ~DEVFL_GDALLOC;
	312	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	313	}
	314
	315	void
	316	aoeblk_exit(void)
	317	{
	318	kmem_cache_destroy(buf_pool_cache);
	319	}
	320
	321	int __init
	322	aoeblk_init(void)
	323	{
20c2df83	324	buf_pool_cache = kmem_cache_create("aoe_bufs",
1da177e4	325	sizeof(struct buf),
20c2df83	326	0, 0, NULL);
1da177e4 LT	327	if (buf_pool_cache == NULL)
	328	return -ENOMEM;
	329
	330	return 0;
	331	}
	332