[linux-2.6-block.git] / fs / nfs / blocklayout / dev.c

/*
 * Copyright (c) 2014-2016 Christoph Hellwig.
 */
#include <linux/sunrpc/svc.h>
#include <linux/blkdev.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_xdr.h>
#include <linux/pr.h>

#include "blocklayout.h"

#define NFSDBG_FACILITY		NFSDBG_PNFS_LD

static void
bl_free_device(struct pnfs_block_dev *dev)
{
	if (dev->nr_children) {
		int i;

		for (i = 0; i < dev->nr_children; i++)
			bl_free_device(&dev->children[i]);
		kfree(dev->children);
	} else {
		if (dev->pr_registered) {
			const struct pr_ops *ops =
				dev->bdev->bd_disk->fops->pr_ops;
			int error;

			error = ops->pr_register(dev->bdev, dev->pr_key, 0,
				false);
			if (error)
				pr_err("failed to unregister PR key.\n");
		}

		if (dev->bdev)
			blkdev_put(dev->bdev, FMODE_READ | FMODE_WRITE);
	}
}

void
bl_free_deviceid_node(struct nfs4_deviceid_node *d)
{
	struct pnfs_block_dev *dev =
		container_of(d, struct pnfs_block_dev, node);

	bl_free_device(dev);
	kfree_rcu(dev, node.rcu);
}

static int
nfs4_block_decode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
{
	__be32 *p;
	int i;

	p = xdr_inline_decode(xdr, 4);
	if (!p)
		return -EIO;
	b->type = be32_to_cpup(p++);

	switch (b->type) {
	case PNFS_BLOCK_VOLUME_SIMPLE:
		p = xdr_inline_decode(xdr, 4);
		if (!p)
			return -EIO;
		b->simple.nr_sigs = be32_to_cpup(p++);
		if (!b->simple.nr_sigs) {
			dprintk("no signature\n");
			return -EIO;
		}

		b->simple.len = 4 + 4;
		for (i = 0; i < b->simple.nr_sigs; i++) {
			p = xdr_inline_decode(xdr, 8 + 4);
			if (!p)
				return -EIO;
			p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
			b->simple.sigs[i].sig_len = be32_to_cpup(p++);
			if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {
				pr_info("signature too long: %d\n",
					b->simple.sigs[i].sig_len);
				return -EIO;
			}

			p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
			if (!p)
				return -EIO;
			memcpy(&b->simple.sigs[i].sig, p,
				b->simple.sigs[i].sig_len);

			b->simple.len += 8 + 4 + b->simple.sigs[i].sig_len;
		}
		break;
	case PNFS_BLOCK_VOLUME_SLICE:
		p = xdr_inline_decode(xdr, 8 + 8 + 4);
		if (!p)
			return -EIO;
		p = xdr_decode_hyper(p, &b->slice.start);
		p = xdr_decode_hyper(p, &b->slice.len);
		b->slice.volume = be32_to_cpup(p++);
		break;
	case PNFS_BLOCK_VOLUME_CONCAT:
		p = xdr_inline_decode(xdr, 4);
		if (!p)
			return -EIO;
		b->concat.volumes_count = be32_to_cpup(p++);

		p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
		if (!p)
			return -EIO;
		for (i = 0; i < b->concat.volumes_count; i++)
			b->concat.volumes[i] = be32_to_cpup(p++);
		break;
	case PNFS_BLOCK_VOLUME_STRIPE:
		p = xdr_inline_decode(xdr, 8 + 4);
		if (!p)
			return -EIO;
		p = xdr_decode_hyper(p, &b->stripe.chunk_size);
		b->stripe.volumes_count = be32_to_cpup(p++);

		p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
		if (!p)
			return -EIO;
		for (i = 0; i < b->stripe.volumes_count; i++)
			b->stripe.volumes[i] = be32_to_cpup(p++);
		break;
	case PNFS_BLOCK_VOLUME_SCSI:
		p = xdr_inline_decode(xdr, 4 + 4 + 4);
		if (!p)
			return -EIO;
		b->scsi.code_set = be32_to_cpup(p++);
		b->scsi.designator_type = be32_to_cpup(p++);
		b->scsi.designator_len = be32_to_cpup(p++);
		p = xdr_inline_decode(xdr, b->scsi.designator_len);
		if (!p)
			return -EIO;
		if (b->scsi.designator_len > 256)
			return -EIO;
		memcpy(&b->scsi.designator, p, b->scsi.designator_len);
		p = xdr_inline_decode(xdr, 8);
		if (!p)
			return -EIO;
		p = xdr_decode_hyper(p, &b->scsi.pr_key);
		break;
	default:
		dprintk("unknown volume type!\n");
		return -EIO;
	}

	return 0;
}

static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
		struct pnfs_block_dev_map *map)
{
	map->start = dev->start;
	map->len = dev->len;
	map->disk_offset = dev->disk_offset;
	map->bdev = dev->bdev;
	return true;
}

static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
		struct pnfs_block_dev_map *map)
{
	int i;

	for (i = 0; i < dev->nr_children; i++) {
		struct pnfs_block_dev *child = &dev->children[i];

		if (child->start > offset ||
		    child->start + child->len <= offset)
			continue;

		child->map(child, offset - child->start, map);
		return true;
	}

	dprintk("%s: ran off loop!\n", __func__);
	return false;
}

static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
		struct pnfs_block_dev_map *map)
{
	struct pnfs_block_dev *child;
	u64 chunk;
	u32 chunk_idx;
	u64 disk_offset;

	chunk = div_u64(offset, dev->chunk_size);
	div_u64_rem(chunk, dev->nr_children, &chunk_idx);

	if (chunk_idx > dev->nr_children) {
		dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
			__func__, chunk_idx, offset, dev->chunk_size);
		/* error, should not happen */
		return false;
	}

	/* truncate offset to the beginning of the stripe */
	offset = chunk * dev->chunk_size;

	/* disk offset of the stripe */
	disk_offset = div_u64(offset, dev->nr_children);

	child = &dev->children[chunk_idx];
	child->map(child, disk_offset, map);

	map->start += offset;
	map->disk_offset += disk_offset;
	map->len = dev->chunk_size;
	return true;
}

static int
bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);


static int
bl_parse_simple(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
	struct pnfs_block_volume *v = &volumes[idx];
	dev_t dev;

	dev = bl_resolve_deviceid(server, v, gfp_mask);
	if (!dev)
		return -EIO;

	d->bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);
	if (IS_ERR(d->bdev)) {
		printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
			MAJOR(dev), MINOR(dev), PTR_ERR(d->bdev));
		return PTR_ERR(d->bdev);
	}


	d->len = i_size_read(d->bdev->bd_inode);
	d->map = bl_map_simple;

	printk(KERN_INFO "pNFS: using block device %s\n",
		d->bdev->bd_disk->disk_name);
	return 0;
}

static bool
bl_validate_designator(struct pnfs_block_volume *v)
{
	switch (v->scsi.designator_type) {
	case PS_DESIGNATOR_EUI64:
		if (v->scsi.code_set != PS_CODE_SET_BINARY)
			return false;

		if (v->scsi.designator_len != 8 &&
		    v->scsi.designator_len != 10 &&
		    v->scsi.designator_len != 16)
			return false;

		return true;
	case PS_DESIGNATOR_NAA:
		if (v->scsi.code_set != PS_CODE_SET_BINARY)
			return false;

		if (v->scsi.designator_len != 8 &&
		    v->scsi.designator_len != 16)
			return false;

		return true;
	case PS_DESIGNATOR_T10:
	case PS_DESIGNATOR_NAME:
		pr_err("pNFS: unsupported designator "
			"(code set %d, type %d, len %d.\n",
			v->scsi.code_set,
			v->scsi.designator_type,
			v->scsi.designator_len);
		return false;
	default:
		pr_err("pNFS: invalid designator "
			"(code set %d, type %d, len %d.\n",
			v->scsi.code_set,
			v->scsi.designator_type,
			v->scsi.designator_len);
		return false;
	}
}

static int
bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
	struct pnfs_block_volume *v = &volumes[idx];
	const struct pr_ops *ops;
	const char *devname;
	int error;

	if (!bl_validate_designator(v))
		return -EINVAL;

	switch (v->scsi.designator_len) {
	case 8:
		devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%8phN",
				v->scsi.designator);
		break;
	case 12:
		devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%12phN",
				v->scsi.designator);
		break;
	case 16:
		devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%16phN",
				v->scsi.designator);
		break;
	default:
		return -EINVAL;
	}

	d->bdev = blkdev_get_by_path(devname, FMODE_READ, NULL);
	if (IS_ERR(d->bdev)) {
		pr_warn("pNFS: failed to open device %s (%ld)\n",
			devname, PTR_ERR(d->bdev));
		kfree(devname);
		return PTR_ERR(d->bdev);
	}

	kfree(devname);

	d->len = i_size_read(d->bdev->bd_inode);
	d->map = bl_map_simple;
	d->pr_key = v->scsi.pr_key;

	pr_info("pNFS: using block device %s (reservation key 0x%llx)\n",
		d->bdev->bd_disk->disk_name, d->pr_key);

	ops = d->bdev->bd_disk->fops->pr_ops;
	if (!ops) {
		pr_err("pNFS: block device %s does not support reservations.",
				d->bdev->bd_disk->disk_name);
		error = -EINVAL;
		goto out_blkdev_put;
	}

	error = ops->pr_register(d->bdev, 0, d->pr_key, true);
	if (error) {
		pr_err("pNFS: failed to register key for block device %s.",
				d->bdev->bd_disk->disk_name);
		goto out_blkdev_put;
	}

	d->pr_registered = true;
	return 0;

out_blkdev_put:
	blkdev_put(d->bdev, FMODE_READ);
	return error;
}

static int
bl_parse_slice(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
	struct pnfs_block_volume *v = &volumes[idx];
	int ret;

	ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
	if (ret)
		return ret;

	d->disk_offset = v->slice.start;
	d->len = v->slice.len;
	return 0;
}

static int
bl_parse_concat(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
	struct pnfs_block_volume *v = &volumes[idx];
	u64 len = 0;
	int ret, i;

	d->children = kcalloc(v->concat.volumes_count,
			sizeof(struct pnfs_block_dev), GFP_KERNEL);
	if (!d->children)
		return -ENOMEM;

	for (i = 0; i < v->concat.volumes_count; i++) {
		ret = bl_parse_deviceid(server, &d->children[i],
				volumes, v->concat.volumes[i], gfp_mask);
		if (ret)
			return ret;

		d->nr_children++;
		d->children[i].start += len;
		len += d->children[i].len;
	}

	d->len = len;
	d->map = bl_map_concat;
	return 0;
}

static int
bl_parse_stripe(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
	struct pnfs_block_volume *v = &volumes[idx];
	u64 len = 0;
	int ret, i;

	d->children = kcalloc(v->stripe.volumes_count,
			sizeof(struct pnfs_block_dev), GFP_KERNEL);
	if (!d->children)
		return -ENOMEM;

	for (i = 0; i < v->stripe.volumes_count; i++) {
		ret = bl_parse_deviceid(server, &d->children[i],
				volumes, v->stripe.volumes[i], gfp_mask);
		if (ret)
			return ret;

		d->nr_children++;
		len += d->children[i].len;
	}

	d->len = len;
	d->chunk_size = v->stripe.chunk_size;
	d->map = bl_map_stripe;
	return 0;
}

static int
bl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,
		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
{
	switch (volumes[idx].type) {
	case PNFS_BLOCK_VOLUME_SIMPLE:
		return bl_parse_simple(server, d, volumes, idx, gfp_mask);
	case PNFS_BLOCK_VOLUME_SLICE:
		return bl_parse_slice(server, d, volumes, idx, gfp_mask);
	case PNFS_BLOCK_VOLUME_CONCAT:
		return bl_parse_concat(server, d, volumes, idx, gfp_mask);
	case PNFS_BLOCK_VOLUME_STRIPE:
		return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
	case PNFS_BLOCK_VOLUME_SCSI:
		return bl_parse_scsi(server, d, volumes, idx, gfp_mask);
	default:
		dprintk("unsupported volume type: %d\n", volumes[idx].type);
		return -EIO;
	}
}

struct nfs4_deviceid_node *
bl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
		gfp_t gfp_mask)
{
	struct nfs4_deviceid_node *node = NULL;
	struct pnfs_block_volume *volumes;
	struct pnfs_block_dev *top;
	struct xdr_stream xdr;
	struct xdr_buf buf;
	struct page *scratch;
	int nr_volumes, ret, i;
	__be32 *p;

	scratch = alloc_page(gfp_mask);
	if (!scratch)
		goto out;

	xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
	xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);

	p = xdr_inline_decode(&xdr, sizeof(__be32));
	if (!p)
		goto out_free_scratch;
	nr_volumes = be32_to_cpup(p++);

	volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
			  gfp_mask);
	if (!volumes)
		goto out_free_scratch;

	for (i = 0; i < nr_volumes; i++) {
		ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
		if (ret < 0)
			goto out_free_volumes;
	}

	top = kzalloc(sizeof(*top), gfp_mask);
	if (!top)
		goto out_free_volumes;

	ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
	if (ret) {
		bl_free_device(top);
		kfree(top);
		goto out_free_volumes;
	}

	node = &top->node;
	nfs4_init_deviceid_node(node, server, &pdev->dev_id);

out_free_volumes:
	kfree(volumes);
out_free_scratch:
	__free_page(scratch);
out:
	return node;
}
Commit	Line	Data
5c83746a	1	/*
d9186c03	2	* Copyright (c) 2014-2016 Christoph Hellwig.
5c83746a CH	3	*/
	4	#include <linux/sunrpc/svc.h>
	5	#include <linux/blkdev.h>
	6	#include <linux/nfs4.h>
	7	#include <linux/nfs_fs.h>
	8	#include <linux/nfs_xdr.h>
d9186c03	9	#include <linux/pr.h>
5c83746a CH	10
	11	#include "blocklayout.h"
	12
	13	#define NFSDBG_FACILITY NFSDBG_PNFS_LD
	14
	15	static void
	16	bl_free_device(struct pnfs_block_dev *dev)
	17	{
	18	if (dev->nr_children) {
	19	int i;
	20
	21	for (i = 0; i < dev->nr_children; i++)
	22	bl_free_device(&dev->children[i]);
	23	kfree(dev->children);
	24	} else {
d9186c03 CH	25	if (dev->pr_registered) {
	26	const struct pr_ops *ops =
	27	dev->bdev->bd_disk->fops->pr_ops;
	28	int error;
	29
	30	error = ops->pr_register(dev->bdev, dev->pr_key, 0,
	31	false);
	32	if (error)
	33	pr_err("failed to unregister PR key.\n");
	34	}
	35
5c83746a	36	if (dev->bdev)
513d6d7a	37	blkdev_put(dev->bdev, FMODE_READ \| FMODE_WRITE);
5c83746a CH	38	}
	39	}
	40
	41	void
	42	bl_free_deviceid_node(struct nfs4_deviceid_node *d)
	43	{
	44	struct pnfs_block_dev *dev =
	45	container_of(d, struct pnfs_block_dev, node);
	46
	47	bl_free_device(dev);
84a80f62	48	kfree_rcu(dev, node.rcu);
5c83746a CH	49	}
	50
	51	static int
	52	nfs4_block_decode_volume(struct xdr_stream xdr, struct pnfs_block_volume b)
	53	{
	54	__be32 *p;
	55	int i;
	56
	57	p = xdr_inline_decode(xdr, 4);
	58	if (!p)
	59	return -EIO;
	60	b->type = be32_to_cpup(p++);
	61
	62	switch (b->type) {
	63	case PNFS_BLOCK_VOLUME_SIMPLE:
	64	p = xdr_inline_decode(xdr, 4);
	65	if (!p)
	66	return -EIO;
	67	b->simple.nr_sigs = be32_to_cpup(p++);
	68	if (!b->simple.nr_sigs) {
	69	dprintk("no signature\n");
	70	return -EIO;
	71	}
	72
	73	b->simple.len = 4 + 4;
	74	for (i = 0; i < b->simple.nr_sigs; i++) {
	75	p = xdr_inline_decode(xdr, 8 + 4);
	76	if (!p)
	77	return -EIO;
	78	p = xdr_decode_hyper(p, &b->simple.sigs[i].offset);
	79	b->simple.sigs[i].sig_len = be32_to_cpup(p++);
2bd3c63a CH	80	if (b->simple.sigs[i].sig_len > PNFS_BLOCK_UUID_LEN) {
	81	pr_info("signature too long: %d\n",
	82	b->simple.sigs[i].sig_len);
	83	return -EIO;
	84	}
5c83746a CH	85
	86	p = xdr_inline_decode(xdr, b->simple.sigs[i].sig_len);
	87	if (!p)
	88	return -EIO;
	89	memcpy(&b->simple.sigs[i].sig, p,
	90	b->simple.sigs[i].sig_len);
	91
	92	b->simple.len += 8 + 4 + b->simple.sigs[i].sig_len;
	93	}
	94	break;
	95	case PNFS_BLOCK_VOLUME_SLICE:
	96	p = xdr_inline_decode(xdr, 8 + 8 + 4);
	97	if (!p)
	98	return -EIO;
	99	p = xdr_decode_hyper(p, &b->slice.start);
	100	p = xdr_decode_hyper(p, &b->slice.len);
	101	b->slice.volume = be32_to_cpup(p++);
	102	break;
	103	case PNFS_BLOCK_VOLUME_CONCAT:
	104	p = xdr_inline_decode(xdr, 4);
	105	if (!p)
	106	return -EIO;
	107	b->concat.volumes_count = be32_to_cpup(p++);
	108
	109	p = xdr_inline_decode(xdr, b->concat.volumes_count * 4);
	110	if (!p)
	111	return -EIO;
	112	for (i = 0; i < b->concat.volumes_count; i++)
	113	b->concat.volumes[i] = be32_to_cpup(p++);
	114	break;
	115	case PNFS_BLOCK_VOLUME_STRIPE:
	116	p = xdr_inline_decode(xdr, 8 + 4);
	117	if (!p)
	118	return -EIO;
	119	p = xdr_decode_hyper(p, &b->stripe.chunk_size);
	120	b->stripe.volumes_count = be32_to_cpup(p++);
	121
	122	p = xdr_inline_decode(xdr, b->stripe.volumes_count * 4);
	123	if (!p)
	124	return -EIO;
	125	for (i = 0; i < b->stripe.volumes_count; i++)
	126	b->stripe.volumes[i] = be32_to_cpup(p++);
	127	break;
d9186c03 CH	128	case PNFS_BLOCK_VOLUME_SCSI:
	129	p = xdr_inline_decode(xdr, 4 + 4 + 4);
	130	if (!p)
	131	return -EIO;
	132	b->scsi.code_set = be32_to_cpup(p++);
	133	b->scsi.designator_type = be32_to_cpup(p++);
	134	b->scsi.designator_len = be32_to_cpup(p++);
	135	p = xdr_inline_decode(xdr, b->scsi.designator_len);
	136	if (!p)
	137	return -EIO;
	138	if (b->scsi.designator_len > 256)
	139	return -EIO;
	140	memcpy(&b->scsi.designator, p, b->scsi.designator_len);
	141	p = xdr_inline_decode(xdr, 8);
	142	if (!p)
	143	return -EIO;
	144	p = xdr_decode_hyper(p, &b->scsi.pr_key);
	145	break;
5c83746a CH	146	default:
	147	dprintk("unknown volume type!\n");
	148	return -EIO;
	149	}
	150
	151	return 0;
	152	}
	153
	154	static bool bl_map_simple(struct pnfs_block_dev *dev, u64 offset,
	155	struct pnfs_block_dev_map *map)
	156	{
	157	map->start = dev->start;
	158	map->len = dev->len;
	159	map->disk_offset = dev->disk_offset;
	160	map->bdev = dev->bdev;
	161	return true;
	162	}
	163
	164	static bool bl_map_concat(struct pnfs_block_dev *dev, u64 offset,
	165	struct pnfs_block_dev_map *map)
	166	{
	167	int i;
	168
	169	for (i = 0; i < dev->nr_children; i++) {
	170	struct pnfs_block_dev *child = &dev->children[i];
	171
	172	if (child->start > offset \|\|
	173	child->start + child->len <= offset)
	174	continue;
	175
	176	child->map(child, offset - child->start, map);
	177	return true;
	178	}
	179
	180	dprintk("%s: ran off loop!\n", __func__);
	181	return false;
	182	}
	183
	184	static bool bl_map_stripe(struct pnfs_block_dev *dev, u64 offset,
	185	struct pnfs_block_dev_map *map)
	186	{
	187	struct pnfs_block_dev *child;
5466112f TM	188	u64 chunk;
5466112f TM	189	u32 chunk_idx;
5c83746a CH	190	u64 disk_offset;
5c83746a CH	191
5466112f TM	192	chunk = div_u64(offset, dev->chunk_size);
	193	div_u64_rem(chunk, dev->nr_children, &chunk_idx);
	194
5c83746a CH	195	if (chunk_idx > dev->nr_children) {
	196	dprintk("%s: invalid chunk idx %d (%lld/%lld)\n",
	197	__func__, chunk_idx, offset, dev->chunk_size);
	198	/* error, should not happen */
	199	return false;
	200	}
	201
	202	/* truncate offset to the beginning of the stripe */
	203	offset = chunk * dev->chunk_size;
	204
	205	/* disk offset of the stripe */
5466112f	206	disk_offset = div_u64(offset, dev->nr_children);
5c83746a CH	207
	208	child = &dev->children[chunk_idx];
	209	child->map(child, disk_offset, map);
	210
	211	map->start += offset;
	212	map->disk_offset += disk_offset;
	213	map->len = dev->chunk_size;
	214	return true;
	215	}
	216
	217	static int
	218	bl_parse_deviceid(struct nfs_server server, struct pnfs_block_dev d,
	219	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);
	220
	221
	222	static int
	223	bl_parse_simple(struct nfs_server server, struct pnfs_block_dev d,
	224	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
	225	{
	226	struct pnfs_block_volume *v = &volumes[idx];
	227	dev_t dev;
	228
	229	dev = bl_resolve_deviceid(server, v, gfp_mask);
	230	if (!dev)
	231	return -EIO;
	232
513d6d7a	233	d->bdev = blkdev_get_by_dev(dev, FMODE_READ \| FMODE_WRITE, NULL);
5c83746a CH	234	if (IS_ERR(d->bdev)) {
	235	printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",
	236	MAJOR(dev), MINOR(dev), PTR_ERR(d->bdev));
	237	return PTR_ERR(d->bdev);
	238	}
	239
	240
	241	d->len = i_size_read(d->bdev->bd_inode);
	242	d->map = bl_map_simple;
	243
	244	printk(KERN_INFO "pNFS: using block device %s\n",
	245	d->bdev->bd_disk->disk_name);
	246	return 0;
	247	}
	248
d9186c03 CH	249	static bool
	250	bl_validate_designator(struct pnfs_block_volume *v)
	251	{
	252	switch (v->scsi.designator_type) {
	253	case PS_DESIGNATOR_EUI64:
	254	if (v->scsi.code_set != PS_CODE_SET_BINARY)
	255	return false;
	256
	257	if (v->scsi.designator_len != 8 &&
	258	v->scsi.designator_len != 10 &&
	259	v->scsi.designator_len != 16)
	260	return false;
	261
	262	return true;
	263	case PS_DESIGNATOR_NAA:
	264	if (v->scsi.code_set != PS_CODE_SET_BINARY)
	265	return false;
	266
	267	if (v->scsi.designator_len != 8 &&
	268	v->scsi.designator_len != 16)
	269	return false;
	270
	271	return true;
	272	case PS_DESIGNATOR_T10:
	273	case PS_DESIGNATOR_NAME:
	274	pr_err("pNFS: unsupported designator "
	275	"(code set %d, type %d, len %d.\n",
	276	v->scsi.code_set,
	277	v->scsi.designator_type,
	278	v->scsi.designator_len);
	279	return false;
	280	default:
	281	pr_err("pNFS: invalid designator "
	282	"(code set %d, type %d, len %d.\n",
	283	v->scsi.code_set,
	284	v->scsi.designator_type,
	285	v->scsi.designator_len);
	286	return false;
	287	}
	288	}
	289
	290	static int
	291	bl_parse_scsi(struct nfs_server server, struct pnfs_block_dev d,
	292	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
	293	{
	294	struct pnfs_block_volume *v = &volumes[idx];
	295	const struct pr_ops *ops;
	296	const char *devname;
	297	int error;
	298
	299	if (!bl_validate_designator(v))
	300	return -EINVAL;
	301
	302	switch (v->scsi.designator_len) {
	303	case 8:
	304	devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%8phN",
	305	v->scsi.designator);
	306	break;
	307	case 12:
	308	devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%12phN",
	309	v->scsi.designator);
	310	break;
	311	case 16:
	312	devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%16phN",
313	v->scsi.designator);
314	break;
315	default:
316	return -EINVAL;
317	}
318
319	d->bdev = blkdev_get_by_path(devname, FMODE_READ, NULL);
320	if (IS_ERR(d->bdev)) {
321	pr_warn("pNFS: failed to open device %s (%ld)\n",
322	devname, PTR_ERR(d->bdev));
323	kfree(devname);
324	return PTR_ERR(d->bdev);
325	}
326
327	kfree(devname);
328
329	d->len = i_size_read(d->bdev->bd_inode);
330	d->map = bl_map_simple;
331	d->pr_key = v->scsi.pr_key;
332
333	pr_info("pNFS: using block device %s (reservation key 0x%llx)\n",
334	d->bdev->bd_disk->disk_name, d->pr_key);
335
336	ops = d->bdev->bd_disk->fops->pr_ops;
337	if (!ops) {
338	pr_err("pNFS: block device %s does not support reservations.",
339	d->bdev->bd_disk->disk_name);
340	error = -EINVAL;
341	goto out_blkdev_put;
342	}
343
344	error = ops->pr_register(d->bdev, 0, d->pr_key, true);
345	if (error) {
346	pr_err("pNFS: failed to register key for block device %s.",
347	d->bdev->bd_disk->disk_name);
348	goto out_blkdev_put;
349	}
350
351	d->pr_registered = true;
352	return 0;
353
354	out_blkdev_put:
355	blkdev_put(d->bdev, FMODE_READ);
356	return error;
357	}
358
5c83746a CH	359	static int
	360	bl_parse_slice(struct nfs_server server, struct pnfs_block_dev d,
	361	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
	362	{
	363	struct pnfs_block_volume *v = &volumes[idx];
	364	int ret;
	365
	366	ret = bl_parse_deviceid(server, d, volumes, v->slice.volume, gfp_mask);
	367	if (ret)
	368	return ret;
	369
	370	d->disk_offset = v->slice.start;
	371	d->len = v->slice.len;
	372	return 0;
	373	}
	374
	375	static int
	376	bl_parse_concat(struct nfs_server server, struct pnfs_block_dev d,
	377	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
	378	{
	379	struct pnfs_block_volume *v = &volumes[idx];
	380	u64 len = 0;
	381	int ret, i;
	382
	383	d->children = kcalloc(v->concat.volumes_count,
	384	sizeof(struct pnfs_block_dev), GFP_KERNEL);
	385	if (!d->children)
	386	return -ENOMEM;
	387
	388	for (i = 0; i < v->concat.volumes_count; i++) {
	389	ret = bl_parse_deviceid(server, &d->children[i],
	390	volumes, v->concat.volumes[i], gfp_mask);
	391	if (ret)
	392	return ret;
	393
	394	d->nr_children++;
	395	d->children[i].start += len;
	396	len += d->children[i].len;
	397	}
	398
	399	d->len = len;
	400	d->map = bl_map_concat;
	401	return 0;
	402	}
	403
	404	static int
	405	bl_parse_stripe(struct nfs_server server, struct pnfs_block_dev d,
	406	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
	407	{
	408	struct pnfs_block_volume *v = &volumes[idx];
	409	u64 len = 0;
	410	int ret, i;
	411
	412	d->children = kcalloc(v->stripe.volumes_count,
	413	sizeof(struct pnfs_block_dev), GFP_KERNEL);
	414	if (!d->children)
	415	return -ENOMEM;
	416
	417	for (i = 0; i < v->stripe.volumes_count; i++) {
	418	ret = bl_parse_deviceid(server, &d->children[i],
	419	volumes, v->stripe.volumes[i], gfp_mask);
	420	if (ret)
	421	return ret;
	422
423	d->nr_children++;
424	len += d->children[i].len;
425	}
426
427	d->len = len;
428	d->chunk_size = v->stripe.chunk_size;
429	d->map = bl_map_stripe;
430	return 0;
431	}
432
433	static int
434	bl_parse_deviceid(struct nfs_server server, struct pnfs_block_dev d,
435	struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask)
436	{
437	switch (volumes[idx].type) {
438	case PNFS_BLOCK_VOLUME_SIMPLE:
439	return bl_parse_simple(server, d, volumes, idx, gfp_mask);
440	case PNFS_BLOCK_VOLUME_SLICE:
441	return bl_parse_slice(server, d, volumes, idx, gfp_mask);
442	case PNFS_BLOCK_VOLUME_CONCAT:
443	return bl_parse_concat(server, d, volumes, idx, gfp_mask);
444	case PNFS_BLOCK_VOLUME_STRIPE:
445	return bl_parse_stripe(server, d, volumes, idx, gfp_mask);
d9186c03 CH	446	case PNFS_BLOCK_VOLUME_SCSI:
d9186c03 CH	447	return bl_parse_scsi(server, d, volumes, idx, gfp_mask);
5c83746a CH	448	default:
	449	dprintk("unsupported volume type: %d\n", volumes[idx].type);
	450	return -EIO;
	451	}
	452	}
	453
	454	struct nfs4_deviceid_node *
	455	bl_alloc_deviceid_node(struct nfs_server server, struct pnfs_device pdev,
	456	gfp_t gfp_mask)
	457	{
	458	struct nfs4_deviceid_node *node = NULL;
	459	struct pnfs_block_volume *volumes;
	460	struct pnfs_block_dev *top;
	461	struct xdr_stream xdr;
	462	struct xdr_buf buf;
	463	struct page *scratch;
	464	int nr_volumes, ret, i;
	465	__be32 *p;
	466
	467	scratch = alloc_page(gfp_mask);
	468	if (!scratch)
	469	goto out;
	470
	471	xdr_init_decode_pages(&xdr, &buf, pdev->pages, pdev->pglen);
	472	xdr_set_scratch_buffer(&xdr, page_address(scratch), PAGE_SIZE);
	473
	474	p = xdr_inline_decode(&xdr, sizeof(__be32));
	475	if (!p)
	476	goto out_free_scratch;
	477	nr_volumes = be32_to_cpup(p++);
	478
	479	volumes = kcalloc(nr_volumes, sizeof(struct pnfs_block_volume),
	480	gfp_mask);
	481	if (!volumes)
	482	goto out_free_scratch;
	483
	484	for (i = 0; i < nr_volumes; i++) {
	485	ret = nfs4_block_decode_volume(&xdr, &volumes[i]);
	486	if (ret < 0)
	487	goto out_free_volumes;
	488	}
	489
	490	top = kzalloc(sizeof(*top), gfp_mask);
	491	if (!top)
	492	goto out_free_volumes;
	493
	494	ret = bl_parse_deviceid(server, top, volumes, nr_volumes - 1, gfp_mask);
	495	if (ret) {
	496	bl_free_device(top);
	497	kfree(top);
	498	goto out_free_volumes;
	499	}
	500
	501	node = &top->node;
	502	nfs4_init_deviceid_node(node, server, &pdev->dev_id);
	503
	504	out_free_volumes:
	505	kfree(volumes);
	506	out_free_scratch:
	507	__free_page(scratch);
	508	out:
	509	return node;
	510	}