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