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

/* Copyright (c) 2006 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_PAUSE) ? ",paused" :
			(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;

	return snprintf(page, PAGE_SIZE, "%012llx\n",
			(unsigned long long)mac_addr(d->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;

	return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
}
/* 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, .owner = THIS_MODULE },
	.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(&d->gd->dev.kobj, &attr_group);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
	sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
}

static int
aoeblk_open(struct inode *inode, struct file *filp)
{
	struct aoedev *d;
	ulong flags;

	d = inode->i_bdev->bd_disk->private_data;

	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 inode *inode, struct file *filp)
{
	struct aoedev *d;
	ulong flags;

	d = inode->i_bdev->bd_disk->private_data;

	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 aoedev *d;
	struct buf *buf;
	struct sk_buff *sl;
	ulong flags;

	blk_queue_bounce(q, &bio);

	d = bio->bi_bdev->bd_disk->private_data;
	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->start_time = jiffies;
	buf->bio = bio;
	buf->resid = bio->bi_size;
	buf->sector = bio->bi_sector;
	buf->bv = &bio->bi_io_vec[bio->bi_idx];
	WARN_ON(buf->bv->bv_len == 0);
	buf->bv_resid = buf->bv->bv_len;
	buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;

	spin_lock_irqsave(&d->lock, flags);

	if ((d->flags & DEVFL_UP) == 0) {
		printk(KERN_INFO "aoe: device %ld.%ld 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);
	sl = d->sendq_hd;
	d->sendq_hd = d->sendq_tl = NULL;

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

	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 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.%ld\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.%ld\n",
			d->aoemajor, d->aoeminor);
		goto err_disk;
	}

	blk_queue_make_request(&d->blkq, aoeblk_make_request);
	if (bdi_init(&d->blkq.backing_dev_info))
		goto err_mempool;
	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;
	gd->capacity = d->ssize;
	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
		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_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
2611464d	1	/* Copyright (c) 2006 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",
3ae1c24e EC	27	(d->flags & DEVFL_PAUSE) ? ",paused" :
	28	(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
	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 LT	35	struct aoedev *d = disk->private_data;
	36
	37	return snprintf(page, PAGE_SIZE, "%012llx\n",
	38	(unsigned long long)mac_addr(d->addr));
	39	}
edfaa7c3 KS	40	static ssize_t aoedisk_show_netif(struct device *dev,
edfaa7c3 KS	41	struct device_attribute attr, char page)
1da177e4	42	{
edfaa7c3	43	struct gendisk *disk = dev_to_disk(dev);
1da177e4 LT	44	struct aoedev *d = disk->private_data;
	45
	46	return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
	47	}
4613ed27	48	/* firmware version */
edfaa7c3 KS	49	static ssize_t aoedisk_show_fwver(struct device *dev,
edfaa7c3 KS	50	struct device_attribute attr, char page)
4613ed27	51	{
edfaa7c3	52	struct gendisk *disk = dev_to_disk(dev);
4613ed27 EC	53	struct aoedev *d = disk->private_data;
	54
	55	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
	56	}
1da177e4	57
edfaa7c3 KS	58	static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
	59	static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
	60	static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
	61	static struct device_attribute dev_attr_firmware_version = {
	62	.attr = { .name = "firmware-version", .mode = S_IRUGO, .owner = THIS_MODULE },
	63	.show = aoedisk_show_fwver,
4613ed27	64	};
1da177e4	65
4ca5224f	66	static struct attribute *aoe_attrs[] = {
edfaa7c3 KS	67	&dev_attr_state.attr,
	68	&dev_attr_mac.attr,
	69	&dev_attr_netif.attr,
	70	&dev_attr_firmware_version.attr,
	71	NULL,
4ca5224f GKH	72	};
	73
	74	static const struct attribute_group attr_group = {
	75	.attrs = aoe_attrs,
	76	};
	77
	78	static int
1da177e4 LT	79	aoedisk_add_sysfs(struct aoedev *d)
1da177e4 LT	80	{
edfaa7c3	81	return sysfs_create_group(&d->gd->dev.kobj, &attr_group);
1da177e4 LT	82	}
	83	void
	84	aoedisk_rm_sysfs(struct aoedev *d)
	85	{
edfaa7c3	86	sysfs_remove_group(&d->gd->dev.kobj, &attr_group);
1da177e4 LT	87	}
	88
	89	static int
	90	aoeblk_open(struct inode inode, struct file filp)
	91	{
	92	struct aoedev *d;
	93	ulong flags;
	94
	95	d = inode->i_bdev->bd_disk->private_data;
	96
	97	spin_lock_irqsave(&d->lock, flags);
	98	if (d->flags & DEVFL_UP) {
	99	d->nopen++;
	100	spin_unlock_irqrestore(&d->lock, flags);
	101	return 0;
	102	}
	103	spin_unlock_irqrestore(&d->lock, flags);
	104	return -ENODEV;
	105	}
	106
	107	static int
	108	aoeblk_release(struct inode inode, struct file filp)
	109	{
	110	struct aoedev *d;
	111	ulong flags;
	112
	113	d = inode->i_bdev->bd_disk->private_data;
	114
	115	spin_lock_irqsave(&d->lock, flags);
	116
5f7702fd	117	if (--d->nopen == 0) {
1da177e4 LT	118	spin_unlock_irqrestore(&d->lock, flags);
	119	aoecmd_cfg(d->aoemajor, d->aoeminor);
	120	return 0;
	121	}
	122	spin_unlock_irqrestore(&d->lock, flags);
	123
	124	return 0;
	125	}
	126
	127	static int
165125e1	128	aoeblk_make_request(struct request_queue q, struct bio bio)
1da177e4 LT	129	{
	130	struct aoedev *d;
	131	struct buf *buf;
	132	struct sk_buff *sl;
	133	ulong flags;
	134
	135	blk_queue_bounce(q, &bio);
	136
	137	d = bio->bi_bdev->bd_disk->private_data;
	138	buf = mempool_alloc(d->bufpool, GFP_NOIO);
	139	if (buf == NULL) {
a12c93f0	140	printk(KERN_INFO "aoe: buf allocation failure\n");
6712ecf8	141	bio_endio(bio, -ENOMEM);
1da177e4 LT	142	return 0;
	143	}
	144	memset(buf, 0, sizeof(*buf));
	145	INIT_LIST_HEAD(&buf->bufs);
0c6f0e79	146	buf->start_time = jiffies;
1da177e4 LT	147	buf->bio = bio;
	148	buf->resid = bio->bi_size;
	149	buf->sector = bio->bi_sector;
392e4845 EC	150	buf->bv = &bio->bi_io_vec[bio->bi_idx];
392e4845 EC	151	WARN_ON(buf->bv->bv_len == 0);
1da177e4 LT	152	buf->bv_resid = buf->bv->bv_len;
	153	buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
	154
	155	spin_lock_irqsave(&d->lock, flags);
	156
	157	if ((d->flags & DEVFL_UP) == 0) {
a12c93f0 EC	158	printk(KERN_INFO "aoe: device %ld.%ld is not up\n",
a12c93f0 EC	159	d->aoemajor, d->aoeminor);
1da177e4 LT	160	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	161	mempool_free(buf, d->bufpool);
6712ecf8	162	bio_endio(bio, -ENXIO);
1da177e4 LT	163	return 0;
	164	}
	165
	166	list_add_tail(&buf->bufs, &d->bufq);
1da177e4	167
3ae1c24e	168	aoecmd_work(d);
a4b38364	169	sl = d->sendq_hd;
a4b38364	170	d->sendq_hd = d->sendq_tl = NULL;
1da177e4 LT	171
1da177e4 LT	172	spin_unlock_irqrestore(&d->lock, flags);
1da177e4	173	aoenet_xmit(sl);
3ae1c24e	174
1da177e4 LT	175	return 0;
	176	}
	177
1da177e4	178	static int
a885c8c4	179	aoeblk_getgeo(struct block_device bdev, struct hd_geometry geo)
1da177e4	180	{
a885c8c4	181	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4	182
1da177e4	183	if ((d->flags & DEVFL_UP) == 0) {
a12c93f0	184	printk(KERN_ERR "aoe: disk not up\n");
1da177e4 LT	185	return -ENODEV;
	186	}
	187
a885c8c4 CH	188	geo->cylinders = d->geo.cylinders;
	189	geo->heads = d->geo.heads;
	190	geo->sectors = d->geo.sectors;
	191	return 0;
1da177e4 LT	192	}
	193
	194	static struct block_device_operations aoe_bdops = {
	195	.open = aoeblk_open,
	196	.release = aoeblk_release,
a885c8c4	197	.getgeo = aoeblk_getgeo,
1da177e4 LT	198	.owner = THIS_MODULE,
	199	};
	200
	201	/* alloc_disk and add_disk can sleep */
	202	void
	203	aoeblk_gdalloc(void *vp)
	204	{
	205	struct aoedev *d = vp;
	206	struct gendisk *gd;
	207	ulong flags;
	208
	209	gd = alloc_disk(AOE_PARTITIONS);
	210	if (gd == NULL) {
a12c93f0	211	printk(KERN_ERR "aoe: cannot allocate disk structure for %ld.%ld\n",
6bb6285f	212	d->aoemajor, d->aoeminor);
43cbe2cb	213	goto err;
1da177e4 LT	214	}
1da177e4 LT	215
93d2341c	216	d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
1da177e4	217	if (d->bufpool == NULL) {
a12c93f0	218	printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%ld\n",
6bb6285f	219	d->aoemajor, d->aoeminor);
43cbe2cb	220	goto err_disk;
1da177e4 LT	221	}
1da177e4 LT	222
1da177e4	223	blk_queue_make_request(&d->blkq, aoeblk_make_request);
43cbe2cb AM	224	if (bdi_init(&d->blkq.backing_dev_info))
	225	goto err_mempool;
	226	spin_lock_irqsave(&d->lock, flags);
1da177e4 LT	227	gd->major = AOE_MAJOR;
	228	gd->first_minor = d->sysminor * AOE_PARTITIONS;
	229	gd->fops = &aoe_bdops;
	230	gd->private_data = d;
	231	gd->capacity = d->ssize;
	232	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
	233	d->aoemajor, d->aoeminor);
	234
	235	gd->queue = &d->blkq;
	236	d->gd = gd;
3ae1c24e	237	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	238	d->flags \|= DEVFL_UP;
	239
	240	spin_unlock_irqrestore(&d->lock, flags);
	241
	242	add_disk(gd);
	243	aoedisk_add_sysfs(d);
43cbe2cb AM	244	return;
	245
	246	err_mempool:
	247	mempool_destroy(d->bufpool);
	248	err_disk:
	249	put_disk(gd);
	250	err:
	251	spin_lock_irqsave(&d->lock, flags);
	252	d->flags &= ~DEVFL_GDALLOC;
	253	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	254	}
	255
	256	void
	257	aoeblk_exit(void)
	258	{
	259	kmem_cache_destroy(buf_pool_cache);
	260	}
	261
	262	int __init
	263	aoeblk_init(void)
	264	{
20c2df83	265	buf_pool_cache = kmem_cache_create("aoe_bufs",
1da177e4	266	sizeof(struct buf),
20c2df83	267	0, 0, NULL);
1da177e4 LT	268	if (buf_pool_cache == NULL)
	269	return -ENOMEM;
	270
	271	return 0;
	272	}
	273