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

/* Copyright (c) 2012 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoeblk.c
 * block device routines
 */

#include <linux/kernel.h>
#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/ratelimit.h>
#include <linux/genhd.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/moduleparam.h>
#include <linux/debugfs.h>
#include <scsi/sg.h>
#include "aoe.h"

static DEFINE_MUTEX(aoeblk_mutex);
static struct kmem_cache *buf_pool_cache;
static struct dentry *aoe_debugfs_dir;

/* GPFS needs a larger value than the default. */
static int aoe_maxsectors;
module_param(aoe_maxsectors, int, 0644);
MODULE_PARM_DESC(aoe_maxsectors,
	"When nonzero, set the maximum number of sectors per I/O request");

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 + d->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 ssize_t aoedisk_show_payload(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, "%lu\n", d->maxbcnt);
}

static int aoedisk_debugfs_show(struct seq_file *s, void *ignored)
{
	struct aoedev *d;
	unsigned long flags;

	d = s->private;
	spin_lock_irqsave(&d->lock, flags);
	seq_printf(s, "%s\n", d->gd->disk_name); /* place holder */
	spin_unlock_irqrestore(&d->lock, flags);

	return 0;
}

static int aoe_debugfs_open(struct inode *inode, struct file *file)
{
	return single_open(file, aoedisk_debugfs_show, inode->i_private);
}

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 DEVICE_ATTR(payload, S_IRUGO, aoedisk_show_payload, NULL);

static struct attribute *aoe_attrs[] = {
	&dev_attr_state.attr,
	&dev_attr_mac.attr,
	&dev_attr_netif.attr,
	&dev_attr_firmware_version.attr,
	&dev_attr_payload.attr,
	NULL,
};

static const struct attribute_group attr_group = {
	.attrs = aoe_attrs,
};

static const struct file_operations aoe_debugfs_fops = {
	.open = aoe_debugfs_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static void
aoedisk_add_debugfs(struct aoedev *d)
{
	struct dentry *entry;
	char *p;

	if (aoe_debugfs_dir == NULL)
		return;
	p = strchr(d->gd->disk_name, '/');
	if (p == NULL)
		p = d->gd->disk_name;
	else
		p++;
	BUG_ON(*p == '\0');
	entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
				    &aoe_debugfs_fops);
	if (IS_ERR_OR_NULL(entry)) {
		pr_info("aoe: cannot create debugfs file for %s\n",
			d->gd->disk_name);
		return;
	}
	BUG_ON(d->debugfs);
	d->debugfs = entry;
}
void
aoedisk_rm_debugfs(struct aoedev *d)
{
	BUG_ON(d->debugfs == NULL);
	debugfs_remove(d->debugfs);
	d->debugfs = NULL;
}

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;

	if (!virt_addr_valid(d)) {
		pr_crit("aoe: invalid device pointer in %s\n",
			__func__);
		WARN_ON(1);
		return -ENODEV;
	}
	if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
		return -ENODEV;

	mutex_lock(&aoeblk_mutex);
	spin_lock_irqsave(&d->lock, flags);
	if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
		d->nopen++;
		spin_unlock_irqrestore(&d->lock, flags);
		mutex_unlock(&aoeblk_mutex);
		return 0;
	}
	spin_unlock_irqrestore(&d->lock, flags);
	mutex_unlock(&aoeblk_mutex);
	return -ENODEV;
}

static void
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;
	}
	spin_unlock_irqrestore(&d->lock, flags);
}

static void
aoeblk_request(struct request_queue *q)
{
	struct aoedev *d;
	struct request *rq;

	d = q->queuedata;
	if ((d->flags & DEVFL_UP) == 0) {
		pr_info_ratelimited("aoe: device %ld.%d is not up\n",
			d->aoemajor, d->aoeminor);
		while ((rq = blk_peek_request(q))) {
			blk_start_request(rq);
			aoe_end_request(d, rq, 1);
		}
		return;
	}
	aoecmd_work(d);
}

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 int
aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
{
	struct aoedev *d;

	if (!arg)
		return -EINVAL;

	d = bdev->bd_disk->private_data;
	if ((d->flags & DEVFL_UP) == 0) {
		pr_err("aoe: disk not up\n");
		return -ENODEV;
	}

	if (cmd == HDIO_GET_IDENTITY) {
		if (!copy_to_user((void __user *) arg, &d->ident,
			sizeof(d->ident)))
			return 0;
		return -EFAULT;
	}

	/* udev calls scsi_id, which uses SG_IO, resulting in noise */
	if (cmd != SG_IO)
		pr_info("aoe: unknown ioctl 0x%x\n", cmd);

	return -ENOTTY;
}

static const struct block_device_operations aoe_bdops = {
	.open = aoeblk_open,
	.release = aoeblk_release,
	.ioctl = aoeblk_ioctl,
	.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;
	mempool_t *mp;
	struct request_queue *q;
	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
	ulong flags;
	int late = 0;

	spin_lock_irqsave(&d->lock, flags);
	if (d->flags & DEVFL_GDALLOC
	&& !(d->flags & DEVFL_TKILL)
	&& !(d->flags & DEVFL_GD_NOW))
		d->flags |= DEVFL_GD_NOW;
	else
		late = 1;
	spin_unlock_irqrestore(&d->lock, flags);
	if (late)
		return;

	gd = alloc_disk(AOE_PARTITIONS);
	if (gd == NULL) {
		pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		goto err;
	}

	mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
		buf_pool_cache);
	if (mp == NULL) {
		printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		goto err_disk;
	}
	q = blk_init_queue(aoeblk_request, &d->lock);
	if (q == NULL) {
		pr_err("aoe: cannot allocate block queue for %ld.%d\n",
			d->aoemajor, d->aoeminor);
		goto err_mempool;
	}

	spin_lock_irqsave(&d->lock, flags);
	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	WARN_ON(!(d->flags & DEVFL_GDALLOC));
	WARN_ON(d->flags & DEVFL_TKILL);
	WARN_ON(d->gd);
	WARN_ON(d->flags & DEVFL_UP);
	blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
	q->backing_dev_info.name = "aoe";
	q->backing_dev_info.ra_pages = READ_AHEAD / PAGE_CACHE_SIZE;
	d->bufpool = mp;
	d->blkq = gd->queue = q;
	q->queuedata = d;
	d->gd = gd;
	if (aoe_maxsectors)
		blk_queue_max_hw_sectors(q, aoe_maxsectors);
	gd->major = AOE_MAJOR;
	gd->first_minor = d->sysminor;
	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);

	d->flags &= ~DEVFL_GDALLOC;
	d->flags |= DEVFL_UP;

	spin_unlock_irqrestore(&d->lock, flags);

	add_disk(gd);
	aoedisk_add_sysfs(d);
	aoedisk_add_debugfs(d);

	spin_lock_irqsave(&d->lock, flags);
	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	d->flags &= ~DEVFL_GD_NOW;
	spin_unlock_irqrestore(&d->lock, flags);
	return;

err_mempool:
	mempool_destroy(mp);
err_disk:
	put_disk(gd);
err:
	spin_lock_irqsave(&d->lock, flags);
	d->flags &= ~DEVFL_GD_NOW;
	schedule_work(&d->work);
	spin_unlock_irqrestore(&d->lock, flags);
}

void
aoeblk_exit(void)
{
	debugfs_remove_recursive(aoe_debugfs_dir);
	aoe_debugfs_dir = NULL;
	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;
	aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
	if (IS_ERR_OR_NULL(aoe_debugfs_dir)) {
		pr_info("aoe: cannot create debugfs directory\n");
		aoe_debugfs_dir = NULL;
	}
	return 0;
}
Commit	Line	Data
fea05a26	1	/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
1da177e4 LT	2	/*
	3	* aoeblk.c
	4	* block device routines
	5	*/
	6
027b180d	7	#include <linux/kernel.h>
1da177e4 LT	8	#include <linux/hdreg.h>
1da177e4 LT	9	#include <linux/blkdev.h>
43cbe2cb	10	#include <linux/backing-dev.h>
1da177e4 LT	11	#include <linux/fs.h>
1da177e4 LT	12	#include <linux/ioctl.h>
5a0e3ad6	13	#include <linux/slab.h>
027b180d	14	#include <linux/ratelimit.h>
1da177e4 LT	15	#include <linux/genhd.h>
1da177e4 LT	16	#include <linux/netdevice.h>
2a48fc0a	17	#include <linux/mutex.h>
d5decd3b	18	#include <linux/export.h>
aa304fde	19	#include <linux/moduleparam.h>
190519cd	20	#include <linux/debugfs.h>
667be1e7	21	#include <scsi/sg.h>
1da177e4 LT	22	#include "aoe.h"
1da177e4 LT	23
2a48fc0a	24	static DEFINE_MUTEX(aoeblk_mutex);
e18b890b	25	static struct kmem_cache *buf_pool_cache;
190519cd	26	static struct dentry *aoe_debugfs_dir;
1da177e4	27
aa304fde EC	28	/* GPFS needs a larger value than the default. */
	29	static int aoe_maxsectors;
	30	module_param(aoe_maxsectors, int, 0644);
	31	MODULE_PARM_DESC(aoe_maxsectors,
	32	"When nonzero, set the maximum number of sectors per I/O request");
	33
edfaa7c3 KS	34	static ssize_t aoedisk_show_state(struct device *dev,
edfaa7c3 KS	35	struct device_attribute attr, char page)
1da177e4	36	{
edfaa7c3	37	struct gendisk *disk = dev_to_disk(dev);
1da177e4 LT	38	struct aoedev *d = disk->private_data;
	39
	40	return snprintf(page, PAGE_SIZE,
	41	"%s%s\n",
	42	(d->flags & DEVFL_UP) ? "up" : "down",
68e0d42f	43	(d->flags & DEVFL_KICKME) ? ",kickme" :
3ae1c24e EC	44	(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
3ae1c24e EC	45	/* I'd rather see nopen exported so we can ditch closewait */
1da177e4	46	}
edfaa7c3 KS	47	static ssize_t aoedisk_show_mac(struct device *dev,
edfaa7c3 KS	48	struct device_attribute attr, char page)
1da177e4	49	{
edfaa7c3	50	struct gendisk *disk = dev_to_disk(dev);
1da177e4	51	struct aoedev *d = disk->private_data;
68e0d42f	52	struct aoetgt *t = d->targets[0];
1da177e4	53
68e0d42f EC	54	if (t == NULL)
68e0d42f EC	55	return snprintf(page, PAGE_SIZE, "none\n");
411c41ee	56	return snprintf(page, PAGE_SIZE, "%pm\n", t->addr);
1da177e4	57	}
edfaa7c3 KS	58	static ssize_t aoedisk_show_netif(struct device *dev,
edfaa7c3 KS	59	struct device_attribute attr, char page)
1da177e4	60	{
edfaa7c3	61	struct gendisk *disk = dev_to_disk(dev);
1da177e4	62	struct aoedev *d = disk->private_data;
68e0d42f EC	63	struct net_device nds[8], nd, nnd, *ne;
	64	struct aoetgt t, te;
	65	struct aoeif ifp, e;
	66	char *p;
	67
	68	memset(nds, 0, sizeof nds);
	69	nd = nds;
	70	ne = nd + ARRAY_SIZE(nds);
	71	t = d->targets;
71114ec4	72	te = t + d->ntargets;
68e0d42f EC	73	for (; t < te && *t; t++) {
	74	ifp = (*t)->ifs;
	75	e = ifp + NAOEIFS;
	76	for (; ifp < e && ifp->nd; ifp++) {
	77	for (nnd = nds; nnd < nd; nnd++)
	78	if (*nnd == ifp->nd)
	79	break;
	80	if (nnd == nd && nd != ne)
	81	*nd++ = ifp->nd;
	82	}
	83	}
1da177e4	84
68e0d42f EC	85	ne = nd;
	86	nd = nds;
	87	if (*nd == NULL)
	88	return snprintf(page, PAGE_SIZE, "none\n");
	89	for (p = page; nd < ne; nd++)
	90	p += snprintf(p, PAGE_SIZE - (p-page), "%s%s",
	91	p == page ? "" : ",", (*nd)->name);
	92	p += snprintf(p, PAGE_SIZE - (p-page), "\n");
	93	return p-page;
1da177e4	94	}
4613ed27	95	/* firmware version */
edfaa7c3 KS	96	static ssize_t aoedisk_show_fwver(struct device *dev,
edfaa7c3 KS	97	struct device_attribute attr, char page)
4613ed27	98	{
edfaa7c3	99	struct gendisk *disk = dev_to_disk(dev);
4613ed27 EC	100	struct aoedev *d = disk->private_data;
	101
	102	return snprintf(page, PAGE_SIZE, "0x%04x\n", (unsigned int) d->fw_ver);
	103	}
90a2508d EC	104	static ssize_t aoedisk_show_payload(struct device *dev,
	105	struct device_attribute attr, char page)
	106	{
	107	struct gendisk *disk = dev_to_disk(dev);
	108	struct aoedev *d = disk->private_data;
	109
	110	return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
	111	}
1da177e4	112
1cf94797 EC	113	static int aoedisk_debugfs_show(struct seq_file s, void ignored)
	114	{
	115	struct aoedev *d;
	116	unsigned long flags;
	117
	118	d = s->private;
	119	spin_lock_irqsave(&d->lock, flags);
	120	seq_printf(s, "%s\n", d->gd->disk_name); /* place holder */
	121	spin_unlock_irqrestore(&d->lock, flags);
	122
	123	return 0;
	124	}
	125
	126	static int aoe_debugfs_open(struct inode inode, struct file file)
	127	{
	128	return single_open(file, aoedisk_debugfs_show, inode->i_private);
	129	}
	130
edfaa7c3 KS	131	static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
	132	static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
	133	static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
	134	static struct device_attribute dev_attr_firmware_version = {
01e8ef11	135	.attr = { .name = "firmware-version", .mode = S_IRUGO },
edfaa7c3	136	.show = aoedisk_show_fwver,
4613ed27	137	};
90a2508d	138	static DEVICE_ATTR(payload, S_IRUGO, aoedisk_show_payload, NULL);
1da177e4	139
4ca5224f	140	static struct attribute *aoe_attrs[] = {
edfaa7c3 KS	141	&dev_attr_state.attr,
	142	&dev_attr_mac.attr,
	143	&dev_attr_netif.attr,
	144	&dev_attr_firmware_version.attr,
90a2508d	145	&dev_attr_payload.attr,
edfaa7c3	146	NULL,
4ca5224f GKH	147	};
	148
	149	static const struct attribute_group attr_group = {
	150	.attrs = aoe_attrs,
	151	};
	152
1cf94797 EC	153	static const struct file_operations aoe_debugfs_fops = {
	154	.open = aoe_debugfs_open,
	155	.read = seq_read,
	156	.llseek = seq_lseek,
	157	.release = single_release,
	158	};
e8866cf2 EC	159
	160	static void
	161	aoedisk_add_debugfs(struct aoedev *d)
	162	{
	163	struct dentry *entry;
	164	char *p;
	165
	166	if (aoe_debugfs_dir == NULL)
	167	return;
	168	p = strchr(d->gd->disk_name, '/');
	169	if (p == NULL)
	170	p = d->gd->disk_name;
	171	else
	172	p++;
	173	BUG_ON(*p == '\0');
	174	entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
	175	&aoe_debugfs_fops);
	176	if (IS_ERR_OR_NULL(entry)) {
	177	pr_info("aoe: cannot create debugfs file for %s\n",
	178	d->gd->disk_name);
	179	return;
	180	}
	181	BUG_ON(d->debugfs);
	182	d->debugfs = entry;
	183	}
	184	void
	185	aoedisk_rm_debugfs(struct aoedev *d)
	186	{
	187	BUG_ON(d->debugfs == NULL);
	188	debugfs_remove(d->debugfs);
	189	d->debugfs = NULL;
	190	}
	191
4ca5224f	192	static int
1da177e4 LT	193	aoedisk_add_sysfs(struct aoedev *d)
1da177e4 LT	194	{
ed9e1982	195	return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
1da177e4 LT	196	}
	197	void
	198	aoedisk_rm_sysfs(struct aoedev *d)
	199	{
ed9e1982	200	sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
1da177e4 LT	201	}
	202
	203	static int
94562c17	204	aoeblk_open(struct block_device *bdev, fmode_t mode)
1da177e4	205	{
94562c17	206	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4 LT	207	ulong flags;
1da177e4 LT	208
e52a2932 EC	209	if (!virt_addr_valid(d)) {
	210	pr_crit("aoe: invalid device pointer in %s\n",
	211	__func__);
	212	WARN_ON(1);
	213	return -ENODEV;
	214	}
	215	if (!(d->flags & DEVFL_UP) \|\| d->flags & DEVFL_TKILL)
	216	return -ENODEV;
	217
2a48fc0a	218	mutex_lock(&aoeblk_mutex);
1da177e4	219	spin_lock_irqsave(&d->lock, flags);
e52a2932	220	if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
1da177e4 LT	221	d->nopen++;
1da177e4 LT	222	spin_unlock_irqrestore(&d->lock, flags);
2a48fc0a	223	mutex_unlock(&aoeblk_mutex);
1da177e4 LT	224	return 0;
	225	}
	226	spin_unlock_irqrestore(&d->lock, flags);
2a48fc0a	227	mutex_unlock(&aoeblk_mutex);
1da177e4 LT	228	return -ENODEV;
	229	}
	230
db2a144b	231	static void
94562c17	232	aoeblk_release(struct gendisk *disk, fmode_t mode)
1da177e4	233	{
94562c17	234	struct aoedev *d = disk->private_data;
1da177e4 LT	235	ulong flags;
1da177e4 LT	236
1da177e4 LT	237	spin_lock_irqsave(&d->lock, flags);
1da177e4 LT	238
5f7702fd	239	if (--d->nopen == 0) {
1da177e4 LT	240	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	241	aoecmd_cfg(d->aoemajor, d->aoeminor);
db2a144b	242	return;
1da177e4 LT	243	}
1da177e4 LT	244	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	245	}
1da177e4 LT	246
5a7bbad2	247	static void
69cf2d85	248	aoeblk_request(struct request_queue *q)
1da177e4 LT	249	{
1da177e4 LT	250	struct aoedev *d;
69cf2d85	251	struct request *rq;
1da177e4	252
69cf2d85	253	d = q->queuedata;
1da177e4	254	if ((d->flags & DEVFL_UP) == 0) {
027b180d	255	pr_info_ratelimited("aoe: device %ld.%d is not up\n",
a12c93f0	256	d->aoemajor, d->aoeminor);
69cf2d85 EC	257	while ((rq = blk_peek_request(q))) {
	258	blk_start_request(rq);
	259	aoe_end_request(d, rq, 1);
	260	}
5a7bbad2	261	return;
1da177e4	262	}
3ae1c24e	263	aoecmd_work(d);
1da177e4 LT	264	}
1da177e4 LT	265
1da177e4	266	static int
a885c8c4	267	aoeblk_getgeo(struct block_device bdev, struct hd_geometry geo)
1da177e4	268	{
a885c8c4	269	struct aoedev *d = bdev->bd_disk->private_data;
1da177e4	270
1da177e4	271	if ((d->flags & DEVFL_UP) == 0) {
a12c93f0	272	printk(KERN_ERR "aoe: disk not up\n");
1da177e4 LT	273	return -ENODEV;
	274	}
	275
a885c8c4 CH	276	geo->cylinders = d->geo.cylinders;
	277	geo->heads = d->geo.heads;
	278	geo->sectors = d->geo.sectors;
	279	return 0;
1da177e4 LT	280	}
1da177e4 LT	281
667be1e7 EC	282	static int
	283	aoeblk_ioctl(struct block_device *bdev, fmode_t mode, uint cmd, ulong arg)
	284	{
	285	struct aoedev *d;
	286
	287	if (!arg)
	288	return -EINVAL;
	289
	290	d = bdev->bd_disk->private_data;
	291	if ((d->flags & DEVFL_UP) == 0) {
	292	pr_err("aoe: disk not up\n");
	293	return -ENODEV;
	294	}
	295
	296	if (cmd == HDIO_GET_IDENTITY) {
	297	if (!copy_to_user((void __user *) arg, &d->ident,
	298	sizeof(d->ident)))
	299	return 0;
	300	return -EFAULT;
	301	}
	302
	303	/* udev calls scsi_id, which uses SG_IO, resulting in noise */
	304	if (cmd != SG_IO)
	305	pr_info("aoe: unknown ioctl 0x%x\n", cmd);
	306
	307	return -ENOTTY;
	308	}
	309
83d5cde4	310	static const struct block_device_operations aoe_bdops = {
94562c17 AV	311	.open = aoeblk_open,
94562c17 AV	312	.release = aoeblk_release,
667be1e7	313	.ioctl = aoeblk_ioctl,
a885c8c4	314	.getgeo = aoeblk_getgeo,
1da177e4 LT	315	.owner = THIS_MODULE,
	316	};
	317
	318	/* alloc_disk and add_disk can sleep */
	319	void
	320	aoeblk_gdalloc(void *vp)
	321	{
	322	struct aoedev *d = vp;
	323	struct gendisk *gd;
69cf2d85 EC	324	mempool_t *mp;
	325	struct request_queue *q;
	326	enum { KB = 1024, MB = KB * KB, READ_AHEAD = 2 * MB, };
1da177e4	327	ulong flags;
e52a2932 EC	328	int late = 0;
	329
	330	spin_lock_irqsave(&d->lock, flags);
	331	if (d->flags & DEVFL_GDALLOC
	332	&& !(d->flags & DEVFL_TKILL)
	333	&& !(d->flags & DEVFL_GD_NOW))
	334	d->flags \|= DEVFL_GD_NOW;
	335	else
	336	late = 1;
	337	spin_unlock_irqrestore(&d->lock, flags);
	338	if (late)
	339	return;
1da177e4 LT	340
	341	gd = alloc_disk(AOE_PARTITIONS);
	342	if (gd == NULL) {
69cf2d85	343	pr_err("aoe: cannot allocate disk structure for %ld.%d\n",
6bb6285f	344	d->aoemajor, d->aoeminor);
43cbe2cb	345	goto err;
1da177e4 LT	346	}
1da177e4 LT	347
69cf2d85 EC	348	mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
	349	buf_pool_cache);
	350	if (mp == NULL) {
1d75981a	351	printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
6bb6285f	352	d->aoemajor, d->aoeminor);
43cbe2cb	353	goto err_disk;
1da177e4	354	}
69cf2d85 EC	355	q = blk_init_queue(aoeblk_request, &d->lock);
	356	if (q == NULL) {
	357	pr_err("aoe: cannot allocate block queue for %ld.%d\n",
	358	d->aoemajor, d->aoeminor);
0a41409c	359	goto err_mempool;
69cf2d85	360	}
1da177e4	361
43cbe2cb	362	spin_lock_irqsave(&d->lock, flags);
e52a2932 EC	363	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	364	WARN_ON(!(d->flags & DEVFL_GDALLOC));
	365	WARN_ON(d->flags & DEVFL_TKILL);
	366	WARN_ON(d->gd);
	367	WARN_ON(d->flags & DEVFL_UP);
0a41409c EC	368	blk_queue_max_hw_sectors(q, BLK_DEF_MAX_SECTORS);
0a41409c EC	369	q->backing_dev_info.name = "aoe";
69cf2d85 EC	370	q->backing_dev_info.ra_pages = READ_AHEAD / PAGE_CACHE_SIZE;
	371	d->bufpool = mp;
	372	d->blkq = gd->queue = q;
	373	q->queuedata = d;
	374	d->gd = gd;
aa304fde EC	375	if (aoe_maxsectors)
aa304fde EC	376	blk_queue_max_hw_sectors(q, aoe_maxsectors);
1da177e4	377	gd->major = AOE_MAJOR;
0c966214	378	gd->first_minor = d->sysminor;
1da177e4 LT	379	gd->fops = &aoe_bdops;
1da177e4 LT	380	gd->private_data = d;
80795aef	381	set_capacity(gd, d->ssize);
68e0d42f	382	snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
1da177e4 LT	383	d->aoemajor, d->aoeminor);
1da177e4 LT	384
3ae1c24e	385	d->flags &= ~DEVFL_GDALLOC;
1da177e4 LT	386	d->flags \|= DEVFL_UP;
	387
	388	spin_unlock_irqrestore(&d->lock, flags);
	389
	390	add_disk(gd);
	391	aoedisk_add_sysfs(d);
e8866cf2	392	aoedisk_add_debugfs(d);
e52a2932 EC	393
	394	spin_lock_irqsave(&d->lock, flags);
	395	WARN_ON(!(d->flags & DEVFL_GD_NOW));
	396	d->flags &= ~DEVFL_GD_NOW;
	397	spin_unlock_irqrestore(&d->lock, flags);
43cbe2cb AM	398	return;
	399
	400	err_mempool:
0a41409c	401	mempool_destroy(mp);
43cbe2cb AM	402	err_disk:
	403	put_disk(gd);
	404	err:
	405	spin_lock_irqsave(&d->lock, flags);
e52a2932 EC	406	d->flags &= ~DEVFL_GD_NOW;
e52a2932 EC	407	schedule_work(&d->work);
43cbe2cb	408	spin_unlock_irqrestore(&d->lock, flags);
1da177e4 LT	409	}
	410
	411	void
	412	aoeblk_exit(void)
	413	{
190519cd EC	414	debugfs_remove_recursive(aoe_debugfs_dir);
190519cd EC	415	aoe_debugfs_dir = NULL;
1da177e4 LT	416	kmem_cache_destroy(buf_pool_cache);
	417	}
	418
	419	int __init
	420	aoeblk_init(void)
	421	{
20c2df83	422	buf_pool_cache = kmem_cache_create("aoe_bufs",
1da177e4	423	sizeof(struct buf),
20c2df83	424	0, 0, NULL);
1da177e4 LT	425	if (buf_pool_cache == NULL)
1da177e4 LT	426	return -ENOMEM;
190519cd EC	427	aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
	428	if (IS_ERR_OR_NULL(aoe_debugfs_dir)) {
	429	pr_info("aoe: cannot create debugfs directory\n");
	430	aoe_debugfs_dir = NULL;
	431	}
1da177e4 LT	432	return 0;
	433	}
	434