[deliverable/linux.git] / drivers / block / aoe / aoeblk.c

/* Copyright (c) 2004 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;

/* add attributes for our block devices in sysfs */
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_CLOSEWAIT) ? ",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);
}

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 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);
}
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");
}

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 && (d->flags & DEVFL_CLOSEWAIT)) {
		d->flags &= ~DEVFL_CLOSEWAIT;
		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) {
		printk(KERN_INFO "aoe: aoeblk_make_request: 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 = buf->bio->bi_io_vec;
	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: aoeblk_make_request: 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->skblist;
	d->skblist = NULL;

	spin_unlock_irqrestore(&d->lock, flags);

	aoenet_xmit(sl);
	return 0;
}

/* This ioctl implementation expects userland to have the device node
 * permissions set so that only priviledged users can open an aoe
 * block device directly.
 */
static int
aoeblk_ioctl(struct inode *inode, struct file *filp, uint cmd, ulong arg)
{
	struct aoedev *d;

	if (!arg)
		return -EINVAL;

	d = inode->i_bdev->bd_disk->private_data;
	if ((d->flags & DEVFL_UP) == 0) {
		printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
		return -ENODEV;
	}

	if (cmd == HDIO_GETGEO) {
		d->geo.start = get_start_sect(inode->i_bdev);
		if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo))
			return 0;
		return -EFAULT;
	}
	printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd);
	return -EINVAL;
}

static struct block_device_operations aoe_bdops = {
	.open = aoeblk_open,
	.release = aoeblk_release,
	.ioctl = aoeblk_ioctl,
	.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: aoeblk_gdalloc: cannot allocate disk "
			"structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
		spin_lock_irqsave(&d->lock, flags);
		d->flags &= ~DEVFL_WORKON;
		spin_unlock_irqrestore(&d->lock, flags);
		return;
	}

	d->bufpool = mempool_create(MIN_BUFS,
				    mempool_alloc_slab, mempool_free_slab,
				    buf_pool_cache);
	if (d->bufpool == NULL) {
		printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
			"for %ld.%ld\n", d->aoemajor, d->aoeminor);
		put_disk(gd);
		spin_lock_irqsave(&d->lock, flags);
		d->flags &= ~DEVFL_WORKON;
		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_WORKON;
	d->flags |= DEVFL_UP;

	spin_unlock_irqrestore(&d->lock, flags);

	add_disk(gd);
	aoedisk_add_sysfs(d);
	
	printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
		"sectors\n", (unsigned long long)mac_addr(d->addr),
		d->aoemajor, d->aoeminor,
		d->fw_ver, (long long)d->ssize);
}

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
1da177e4 LT	1	/* Copyright (c) 2004 Coraid, Inc. See COPYING for GPL terms. */
	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
	17	/* add attributes for our block devices in sysfs */
	18	static ssize_t aoedisk_show_state(struct gendisk * disk, char *page)
	19	{
	20	struct aoedev *d = disk->private_data;
	21
	22	return snprintf(page, PAGE_SIZE,
	23	"%s%s\n",
	24	(d->flags & DEVFL_UP) ? "up" : "down",
	25	(d->flags & DEVFL_CLOSEWAIT) ? ",closewait" : "");
	26	}
	27	static ssize_t aoedisk_show_mac(struct gendisk * disk, char *page)
	28	{
	29	struct aoedev *d = disk->private_data;
	30
	31	return snprintf(page, PAGE_SIZE, "%012llx\n",
	32	(unsigned long long)mac_addr(d->addr));
	33	}
	34	static ssize_t aoedisk_show_netif(struct gendisk * disk, char *page)
	35	{
	36	struct aoedev *d = disk->private_data;
	37
	38	return snprintf(page, PAGE_SIZE, "%s\n", d->ifp->name);
	39	}
	40
	41	static struct disk_attribute disk_attr_state = {
	42	.attr = {.name = "state", .mode = S_IRUGO },
	43	.show = aoedisk_show_state
	44	};
	45	static struct disk_attribute disk_attr_mac = {
	46	.attr = {.name = "mac", .mode = S_IRUGO },
	47	.show = aoedisk_show_mac
	48	};
	49	static struct disk_attribute disk_attr_netif = {
	50	.attr = {.name = "netif", .mode = S_IRUGO },
	51	.show = aoedisk_show_netif
	52	};
	53
	54	static void
	55	aoedisk_add_sysfs(struct aoedev *d)
	56	{
	57	sysfs_create_file(&d->gd->kobj, &disk_attr_state.attr);
	58	sysfs_create_file(&d->gd->kobj, &disk_attr_mac.attr);
	59	sysfs_create_file(&d->gd->kobj, &disk_attr_netif.attr);
	60	}
	61	void
	62	aoedisk_rm_sysfs(struct aoedev *d)
	63	{
	64	sysfs_remove_link(&d->gd->kobj, "state");
65	sysfs_remove_link(&d->gd->kobj, "mac");
66	sysfs_remove_link(&d->gd->kobj, "netif");
67	}
68
69	static int
70	aoeblk_open(struct inode inode, struct file filp)
71	{
72	struct aoedev *d;
73	ulong flags;
74
75	d = inode->i_bdev->bd_disk->private_data;
76
77	spin_lock_irqsave(&d->lock, flags);
78	if (d->flags & DEVFL_UP) {
79	d->nopen++;
80	spin_unlock_irqrestore(&d->lock, flags);
81	return 0;
82	}
83	spin_unlock_irqrestore(&d->lock, flags);
84	return -ENODEV;
85	}
86
87	static int
88	aoeblk_release(struct inode inode, struct file filp)
89	{
90	struct aoedev *d;
91	ulong flags;
92
93	d = inode->i_bdev->bd_disk->private_data;
94
95	spin_lock_irqsave(&d->lock, flags);
96
97	if (--d->nopen == 0 && (d->flags & DEVFL_CLOSEWAIT)) {
98	d->flags &= ~DEVFL_CLOSEWAIT;
99	spin_unlock_irqrestore(&d->lock, flags);
100	aoecmd_cfg(d->aoemajor, d->aoeminor);
101	return 0;
102	}
103	spin_unlock_irqrestore(&d->lock, flags);
104
105	return 0;
106	}
107
108	static int
109	aoeblk_make_request(request_queue_t q, struct bio bio)
110	{
111	struct aoedev *d;
112	struct buf *buf;
113	struct sk_buff *sl;
114	ulong flags;
115
116	blk_queue_bounce(q, &bio);
117
118	d = bio->bi_bdev->bd_disk->private_data;
119	buf = mempool_alloc(d->bufpool, GFP_NOIO);
120	if (buf == NULL) {
121	printk(KERN_INFO "aoe: aoeblk_make_request: buf allocation "
122	"failure\n");
123	bio_endio(bio, bio->bi_size, -ENOMEM);
124	return 0;
125	}
126	memset(buf, 0, sizeof(*buf));
127	INIT_LIST_HEAD(&buf->bufs);
0c6f0e79	128	buf->start_time = jiffies;
1da177e4 LT	129	buf->bio = bio;
	130	buf->resid = bio->bi_size;
	131	buf->sector = bio->bi_sector;
	132	buf->bv = buf->bio->bi_io_vec;
	133	buf->bv_resid = buf->bv->bv_len;
	134	buf->bufaddr = page_address(buf->bv->bv_page) + buf->bv->bv_offset;
	135
	136	spin_lock_irqsave(&d->lock, flags);
	137
	138	if ((d->flags & DEVFL_UP) == 0) {
	139	printk(KERN_INFO "aoe: aoeblk_make_request: device %ld.%ld is not up\n",
	140	d->aoemajor, d->aoeminor);
	141	spin_unlock_irqrestore(&d->lock, flags);
	142	mempool_free(buf, d->bufpool);
	143	bio_endio(bio, bio->bi_size, -ENXIO);
	144	return 0;
	145	}
	146
	147	list_add_tail(&buf->bufs, &d->bufq);
	148	aoecmd_work(d);
	149
	150	sl = d->skblist;
	151	d->skblist = NULL;
	152
	153	spin_unlock_irqrestore(&d->lock, flags);
	154
	155	aoenet_xmit(sl);
	156	return 0;
	157	}
	158
	159	/* This ioctl implementation expects userland to have the device node
	160	* permissions set so that only priviledged users can open an aoe
	161	* block device directly.
	162	*/
	163	static int
	164	aoeblk_ioctl(struct inode inode, struct file filp, uint cmd, ulong arg)
	165	{
	166	struct aoedev *d;
	167
	168	if (!arg)
	169	return -EINVAL;
	170
	171	d = inode->i_bdev->bd_disk->private_data;
	172	if ((d->flags & DEVFL_UP) == 0) {
	173	printk(KERN_ERR "aoe: aoeblk_ioctl: disk not up\n");
	174	return -ENODEV;
	175	}
	176
	177	if (cmd == HDIO_GETGEO) {
	178	d->geo.start = get_start_sect(inode->i_bdev);
	179	if (!copy_to_user((void __user *) arg, &d->geo, sizeof d->geo))
	180	return 0;
	181	return -EFAULT;
	182	}
	183	printk(KERN_INFO "aoe: aoeblk_ioctl: unknown ioctl %d\n", cmd);
	184	return -EINVAL;
	185	}
	186
	187	static struct block_device_operations aoe_bdops = {
	188	.open = aoeblk_open,
	189	.release = aoeblk_release,
	190	.ioctl = aoeblk_ioctl,
	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) {
204	printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate disk "
205	"structure for %ld.%ld\n", d->aoemajor, d->aoeminor);
206	spin_lock_irqsave(&d->lock, flags);
207	d->flags &= ~DEVFL_WORKON;
208	spin_unlock_irqrestore(&d->lock, flags);
209	return;
210	}
211
212	d->bufpool = mempool_create(MIN_BUFS,
213	mempool_alloc_slab, mempool_free_slab,
214	buf_pool_cache);
215	if (d->bufpool == NULL) {
216	printk(KERN_ERR "aoe: aoeblk_gdalloc: cannot allocate bufpool "
217	"for %ld.%ld\n", d->aoemajor, d->aoeminor);
218	put_disk(gd);
219	spin_lock_irqsave(&d->lock, flags);
220	d->flags &= ~DEVFL_WORKON;
221	spin_unlock_irqrestore(&d->lock, flags);
222	return;
223	}
224
225	spin_lock_irqsave(&d->lock, flags);
226	blk_queue_make_request(&d->blkq, aoeblk_make_request);
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;
237	d->flags &= ~DEVFL_WORKON;
238	d->flags \|= DEVFL_UP;
239
240	spin_unlock_irqrestore(&d->lock, flags);
241
242	add_disk(gd);
243	aoedisk_add_sysfs(d);
244
245	printk(KERN_INFO "aoe: %012llx e%lu.%lu v%04x has %llu "
246	"sectors\n", (unsigned long long)mac_addr(d->addr),
247	d->aoemajor, d->aoeminor,
248	d->fw_ver, (long long)d->ssize);
249	}
250
251	void
252	aoeblk_exit(void)
253	{
254	kmem_cache_destroy(buf_pool_cache);
255	}
256
257	int __init
258	aoeblk_init(void)
259	{
260	buf_pool_cache = kmem_cache_create("aoe_bufs",
261	sizeof(struct buf),
262	0, 0, NULL, NULL);
263	if (buf_pool_cache == NULL)
264	return -ENOMEM;
265
266	return 0;
267	}
268