[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/fs.h>
#include <linux/ioctl.h>
#include <linux/genhd.h>
#include <linux/netdevice.h>
#include "aoe.h"

static kmem_cache_t *buf_pool_cache;

static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
{
	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 gendisk * disk, char *page)
{
	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 gendisk * disk, char *page)
{
	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 gendisk * disk, char *page)
{
	struct aoedev *d = disk->private_data;

	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
}

static struct disk_attribute disk_attr_state = {
	.attr = {.name = "state", .mode = S_IRUGO },
	.show = aoedisk_show_state
};
static struct disk_attribute disk_attr_mac = {
	.attr = {.name = "mac", .mode = S_IRUGO },
	.show = aoedisk_show_mac
};
static struct disk_attribute disk_attr_netif = {
	.attr = {.name = "netif", .mode = S_IRUGO },
	.show = aoedisk_show_netif
};
static struct disk_attribute disk_attr_fwver = {
	.attr = {.name = "firmware-version", .mode = S_IRUGO },
	.show = aoedisk_show_fwver
};

static void
aoedisk_add_sysfs(struct aoedev *d)
{
	sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
	sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
	sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
	sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr);
}
void
aoedisk_rm_sysfs(struct aoedev *d)
{
	sysfs_remove_link(&d->gd->kobj, "state");
	sysfs_remove_link(&d->gd->kobj, "mac");
	sysfs_remove_link(&d->gd->kobj, "netif");
	sysfs_remove_link(&d->gd->kobj, "firmware-version");
}

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(request_queue_t *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) {
		iprintk("buf allocation failure\n");
		bio_endio(bio, bio->bi_size, -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) {
		iprintk("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, bio->bi_size, -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) {
		eprintk("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) {
		eprintk("cannot allocate disk structure for %ld.%ld\n",
			d->aoemajor, d->aoeminor);
		spin_lock_irqsave(&d->lock, flags);
		d->flags &= ~DEVFL_GDALLOC;
		spin_unlock_irqrestore(&d->lock, flags);
		return;
	}

	d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
	if (d->bufpool == NULL) {
		eprintk("cannot allocate bufpool for %ld.%ld\n",
			d->aoemajor, d->aoeminor);
		put_disk(gd);
		spin_lock_irqsave(&d->lock, flags);
		d->flags &= ~DEVFL_GDALLOC;
		spin_unlock_irqrestore(&d->lock, flags);
		return;
	}

	spin_lock_irqsave(&d->lock, flags);
	blk_queue_make_request(&d->blkq, aoeblk_make_request);
	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);
}

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, 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>
	9	#include <linux/fs.h>
	10	#include <linux/ioctl.h>
	11	#include <linux/genhd.h>
	12	#include <linux/netdevice.h>
	13	#include "aoe.h"
	14
	15	static kmem_cache_t *buf_pool_cache;
	16
1da177e4 LT	17	static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
	18	{
	19	struct aoedev *d = disk->private_data;
	20
	21	return snprintf(page, PAGE_SIZE,
	22	"%s%s\n",
	23	(d->flags & DEVFL_UP) ? "up" : "down",
3ae1c24e EC	24	(d->flags & DEVFL_PAUSE) ? ",paused" :
	25	(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
	26	/* I'd rather see nopen exported so we can ditch closewait */
1da177e4 LT	27	}
	28	static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
	29	{
	30	struct aoedev *d = disk->private_data;
	31
	32	return snprintf(page, PAGE_SIZE, "%012llx\n",
	33	(unsigned long long)mac_addr(d->addr));
	34	}
	35	static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
	36	{
	37	struct aoedev *d = disk->private_data;
	38
	39	return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
	40	}
4613ed27 EC	41	/* firmware version */
	42	static ssize_t aoedisk_show_fwver(struct gendisk * disk, char *page)
	43	{
	44	struct aoedev *d = disk->private_data;
	45
	46	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
	47	}
1da177e4 LT	48
	49	static struct disk_attribute disk_attr_state = {
	50	.attr = {.name = "state", .mode = S_IRUGO },
	51	.show = aoedisk_show_state
	52	};
	53	static struct disk_attribute disk_attr_mac = {
	54	.attr = {.name = "mac", .mode = S_IRUGO },
	55	.show = aoedisk_show_mac
	56	};
	57	static struct disk_attribute disk_attr_netif = {
	58	.attr = {.name = "netif", .mode = S_IRUGO },
	59	.show = aoedisk_show_netif
	60	};
4613ed27 EC	61	static struct disk_attribute disk_attr_fwver = {
	62	.attr = {.name = "firmware-version", .mode = S_IRUGO },
	63	.show = aoedisk_show_fwver
	64	};
1da177e4 LT	65
	66	static void
	67	aoedisk_add_sysfs(struct aoedev *d)
	68	{
	69	sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
	70	sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
	71	sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
4613ed27	72	sysfs_create_file(&d->gd->kobj, &disk_attr_fwver.attr);
1da177e4 LT	73	}
	74	void
	75	aoedisk_rm_sysfs(struct aoedev *d)
	76	{
	77	sysfs_remove_link(&d->gd->kobj, "state");
	78	sysfs_remove_link(&d->gd->kobj, "mac");
	79	sysfs_remove_link(&d->gd->kobj, "netif");
4613ed27	80	sysfs_remove_link(&d->gd->kobj, "firmware-version");
1da177e4 LT	81	}
	82
	83	static int
	84	aoeblk_open(struct inode inode, struct file filp)
	85	{
	86	struct aoedev *d;
	87	ulong flags;
	88
	89	d = inode->i_bdev->bd_disk->private_data;
	90
	91	spin_lock_irqsave(&d->lock, flags);
	92	if (d->flags & DEVFL_UP) {
	93	d->nopen++;
	94	spin_unlock_irqrestore(&d->lock, flags);
	95	return 0;
	96	}
	97	spin_unlock_irqrestore(&d->lock, flags);
	98	return -ENODEV;
	99	}
	100
	101	static int
	102	aoeblk_release(struct inode inode, struct file filp)
	103	{
	104	struct aoedev *d;
	105	ulong flags;
	106
	107	d = inode->i_bdev->bd_disk->private_data;
	108
	109	spin_lock_irqsave(&d->lock, flags);
	110
5f7702fd	111	if (--d->nopen == 0) {
1da177e4 LT	112	spin_unlock_irqrestore(&d->lock, flags);
	113	aoecmd_cfg(d->aoemajor, d->aoeminor);
	114	return 0;
	115	}
	116	spin_unlock_irqrestore(&d->lock, flags);
	117
	118	return 0;
	119	}
	120
	121	static int
	122	aoeblk_make_request(request_queue_t q, struct bio bio)
	123	{
	124	struct aoedev *d;
	125	struct buf *buf;
	126	struct sk_buff *sl;
	127	ulong flags;
	128
	129	blk_queue_bounce(q, &bio);
	130
	131	d = bio->bi_bdev->bd_disk->private_data;
	132	buf = mempool_alloc(d->bufpool, GFP_NOIO);
	133	if (buf == NULL) {
6bb6285f	134	iprintk("buf allocation failure\n");
1da177e4 LT	135	bio_endio(bio, bio->bi_size, -ENOMEM);
	136	return 0;
	137	}
	138	memset(buf, 0, sizeof(*buf));
	139	INIT_LIST_HEAD(&buf->bufs);
0c6f0e79	140	buf->start_time = jiffies;
1da177e4 LT	141	buf->bio = bio;
	142	buf->resid = bio->bi_size;
	143	buf->sector = bio->bi_sector;
392e4845 EC	144	buf->bv = &bio->bi_io_vec[bio->bi_idx];
392e4845 EC	145	WARN_ON(buf->bv->bv_len == 0);
1da177e4 LT	146	buf->bv_resid = buf->bv->bv_len;
	147	buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
	148
	149	spin_lock_irqsave(&d->lock, flags);
	150
	151	if ((d->flags & DEVFL_UP) == 0) {
6bb6285f	152	iprintk("device %ld.%ld is not up\n", d->aoemajor, d->aoeminor);
1da177e4 LT	153	spin_unlock_irqrestore(&d->lock, flags);
	154	mempool_free(buf, d->bufpool);
	155	bio_endio(bio, bio->bi_size, -ENXIO);
	156	return 0;
	157	}
	158
	159	list_add_tail(&buf->bufs, &d->bufq);
1da177e4	160
3ae1c24e	161	aoecmd_work(d);
a4b38364	162	sl = d->sendq_hd;
a4b38364	163	d->sendq_hd = d->sendq_tl = NULL;
1da177e4 LT	164
1da177e4 LT	165	spin_unlock_irqrestore(&d->lock, flags);
1da177e4	166	aoenet_xmit(sl);
3ae1c24e	167
1da177e4 LT	168	return 0;
	169	}
	170
1da177e4	171	static int
a885c8c4	172	aoeblk_getgeo(struct block_device bdev, struct hd_geometry geo)
1da177e4	173	{
a885c8c4	174	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4	175
1da177e4	176	if ((d->flags & DEVFL_UP) == 0) {
6bb6285f	177	eprintk("disk not up\n");
1da177e4 LT	178	return -ENODEV;
	179	}
	180
a885c8c4 CH	181	geo->cylinders = d->geo.cylinders;
	182	geo->heads = d->geo.heads;
	183	geo->sectors = d->geo.sectors;
	184	return 0;
1da177e4 LT	185	}
	186
	187	static struct block_device_operations aoe_bdops = {
	188	.open = aoeblk_open,
	189	.release = aoeblk_release,
a885c8c4	190	.getgeo = aoeblk_getgeo,
1da177e4 LT	191	.owner = THIS_MODULE,
	192	};
	193
	194	/* alloc_disk and add_disk can sleep */
	195	void
	196	aoeblk_gdalloc(void *vp)
	197	{
	198	struct aoedev *d = vp;
	199	struct gendisk *gd;
	200	ulong flags;
	201
	202	gd = alloc_disk(AOE_PARTITIONS);
	203	if (gd == NULL) {
6bb6285f EC	204	eprintk("cannot allocate disk structure for %ld.%ld\n",
6bb6285f EC	205	d->aoemajor, d->aoeminor);
1da177e4	206	spin_lock_irqsave(&d->lock, flags);
3ae1c24e	207	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	208	spin_unlock_irqrestore(&d->lock, flags);
	209	return;
	210	}
	211
93d2341c	212	d->bufpool = mempool_create_slab_pool(MIN_BUFS, buf_pool_cache);
1da177e4	213	if (d->bufpool == NULL) {
6bb6285f EC	214	eprintk("cannot allocate bufpool for %ld.%ld\n",
6bb6285f EC	215	d->aoemajor, d->aoeminor);
1da177e4 LT	216	put_disk(gd);
1da177e4 LT	217	spin_lock_irqsave(&d->lock, flags);
3ae1c24e	218	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	219	spin_unlock_irqrestore(&d->lock, flags);
	220	return;
	221	}
	222
	223	spin_lock_irqsave(&d->lock, flags);
	224	blk_queue_make_request(&d->blkq, aoeblk_make_request);
	225	gd->major = AOE_MAJOR;
	226	gd->first_minor = d->sysminor * AOE_PARTITIONS;
	227	gd->fops = &aoe_bdops;
	228	gd->private_data = d;
	229	gd->capacity = d->ssize;
	230	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%ld",
	231	d->aoemajor, d->aoeminor);
	232
	233	gd->queue = &d->blkq;
	234	d->gd = gd;
3ae1c24e	235	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	236	d->flags \|= DEVFL_UP;
	237
	238	spin_unlock_irqrestore(&d->lock, flags);
	239
	240	add_disk(gd);
	241	aoedisk_add_sysfs(d);
1da177e4 LT	242	}
	243
	244	void
	245	aoeblk_exit(void)
	246	{
	247	kmem_cache_destroy(buf_pool_cache);
	248	}
	249
	250	int __init
	251	aoeblk_init(void)
	252	{
	253	buf_pool_cache = kmem_cache_create("aoe_bufs",
	254	sizeof(struct buf),
	255	0, 0, NULL, NULL);
	256	if (buf_pool_cache == NULL)
	257	return -ENOMEM;
	258
	259	return 0;
	260	}
	261