// SPDX-License-Identifier: GPL-2.0/* * 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 voidbl_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);	}} voidbl_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 intnfs4_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 || b->simple.nr_sigs > PNFS_BLOCK_MAX_UUIDS) {			dprintk("Bad signature count: %d\n", b->simple.nr_sigs);			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 + \				(XDR_QUADLEN(b->simple.sigs[i].sig_len) << 2);		}		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++);		if (b->concat.volumes_count > PNFS_BLOCK_MAX_DEVICES) {			dprintk("Too many volumes: %d\n", b->concat.volumes_count);			return -EIO;		} 		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++);		if (b->stripe.volumes_count > PNFS_BLOCK_MAX_DEVICES) {			dprintk("Too many volumes: %d\n", b->stripe.volumes_count);			return -EIO;		} 		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 intbl_parse_deviceid(struct nfs_server *server, struct pnfs_block_dev *d,		struct pnfs_block_volume *volumes, int idx, gfp_t gfp_mask);  static intbl_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];	struct block_device *bdev;	dev_t dev; 	dev = bl_resolve_deviceid(server, v, gfp_mask);	if (!dev)		return -EIO; 	bdev = blkdev_get_by_dev(dev, FMODE_READ | FMODE_WRITE, NULL);	if (IS_ERR(bdev)) {		printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",			MAJOR(dev), MINOR(dev), PTR_ERR(bdev));		return PTR_ERR(bdev);	}	d->bdev = 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 boolbl_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;	}} /* * Try to open the udev path for the WWN.  At least on Debian the udev * by-id path will always point to the dm-multipath device if one exists. */static struct block_device *bl_open_udev_path(struct pnfs_block_volume *v){	struct block_device *bdev;	const char *devname; 	devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/wwn-0x%*phN",				v->scsi.designator_len, v->scsi.designator);	if (!devname)		return ERR_PTR(-ENOMEM); 	bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);	if (IS_ERR(bdev)) {		pr_warn("pNFS: failed to open device %s (%ld)\n",			devname, PTR_ERR(bdev));	} 	kfree(devname);	return bdev;} /* * Try to open the RH/Fedora specific dm-mpath udev path for this WWN, as the * wwn- links will only point to the first discovered SCSI device there. */static struct block_device *bl_open_dm_mpath_udev_path(struct pnfs_block_volume *v){	struct block_device *bdev;	const char *devname; 	devname = kasprintf(GFP_KERNEL,			"/dev/disk/by-id/dm-uuid-mpath-%d%*phN",			v->scsi.designator_type,			v->scsi.designator_len, v->scsi.designator);	if (!devname)		return ERR_PTR(-ENOMEM); 	bdev = blkdev_get_by_path(devname, FMODE_READ | FMODE_WRITE, NULL);	kfree(devname);	return bdev;} static intbl_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];	struct block_device *bdev;	const struct pr_ops *ops;	int error; 	if (!bl_validate_designator(v))		return -EINVAL; 	bdev = bl_open_dm_mpath_udev_path(v);	if (IS_ERR(bdev))		bdev = bl_open_udev_path(v);	if (IS_ERR(bdev))		return PTR_ERR(bdev);	d->bdev = bdev; 	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 | FMODE_WRITE);	return error;} static intbl_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 intbl_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 intbl_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 intbl_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;

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