[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/genhd.h>
#include <linux/netdevice.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;

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