// SPDX-License-Identifier: GPL-2.0/* * Copyright (c) 2014-2016 Christoph Hellwig. */#include <linux/sunrpc/svc.h>#include <linux/blkdev.h>#include <linux/fs_struct.h>#include <linux/nfs4.h>#include <linux/nfs_fs.h>#include <linux/nfs_xdr.h>#include <linux/pr.h> #include "blocklayout.h"#include "../nfs4trace.h" #define NFSDBG_FACILITY		NFSDBG_PNFS_LD static void bl_unregister_scsi(struct pnfs_block_dev *dev){	struct block_device *bdev = file_bdev(dev->bdev_file);	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;	int status; 	status = ops->pr_register(bdev, dev->pr_key, 0, false);	if (status)		trace_bl_pr_key_unreg_err(bdev, dev->pr_key, status);	else		trace_bl_pr_key_unreg(bdev, dev->pr_key);} static bool bl_register_scsi(struct pnfs_block_dev *dev){	struct block_device *bdev = file_bdev(dev->bdev_file);	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;	int status; 	if (test_and_set_bit(PNFS_BDEV_REGISTERED, &dev->flags))		return true; 	status = ops->pr_register(bdev, 0, dev->pr_key, true);	if (status) {		trace_bl_pr_key_reg_err(bdev, dev->pr_key, status);		return false;	}	trace_bl_pr_key_reg(bdev, dev->pr_key);	return true;} static void bl_unregister_dev(struct pnfs_block_dev *dev){	u32 i; 	if (dev->nr_children) {		for (i = 0; i < dev->nr_children; i++)			bl_unregister_dev(&dev->children[i]);		return;	} 	if (dev->type == PNFS_BLOCK_VOLUME_SCSI &&		test_and_clear_bit(PNFS_BDEV_REGISTERED, &dev->flags))		bl_unregister_scsi(dev);} bool bl_register_dev(struct pnfs_block_dev *dev){	u32 i; 	if (dev->nr_children) {		for (i = 0; i < dev->nr_children; i++) {			if (!bl_register_dev(&dev->children[i])) {				while (i > 0)					bl_unregister_dev(&dev->children[--i]);				return false;			}		}		return true;	} 	if (dev->type == PNFS_BLOCK_VOLUME_SCSI)		return bl_register_scsi(dev);	return true;} static voidbl_free_device(struct pnfs_block_dev *dev){	bl_unregister_dev(dev); 	if (dev->children) {		int i; 		for (i = 0; i < dev->nr_children; i++)			bl_free_device(&dev->children[i]);		kfree(dev->children);		dev->children = NULL;		dev->nr_children = 0;	} else if (dev->bdev_file) {		fput(dev->bdev_file);		dev->bdev_file = NULL;	}} 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 = file_bdev(dev->bdev_file);	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_chunk;	u64 disk_offset; 	chunk = div_u64(offset, dev->chunk_size);	disk_chunk = 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 = disk_chunk * dev->chunk_size; 	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 file *bdev_file;	dev_t dev; 	dev = bl_resolve_deviceid(server, v, gfp_mask);	if (!dev)		return -EIO; 	bdev_file = bdev_file_open_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_WRITE,				       NULL, NULL);	if (IS_ERR(bdev_file)) {		printk(KERN_WARNING "pNFS: failed to open device %d:%d (%ld)\n",			MAJOR(dev), MINOR(dev), PTR_ERR(bdev_file));		return PTR_ERR(bdev_file);	}	d->bdev_file = bdev_file;	d->len = bdev_nr_bytes(file_bdev(bdev_file));	d->map = bl_map_simple; 	printk(KERN_INFO "pNFS: using block device %s\n",		file_bdev(bdev_file)->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;	}} static struct file *bl_open_path(struct pnfs_block_volume *v, const char *prefix){	struct file *bdev_file;	const char *devname __free(kfree) = NULL; 	devname = kasprintf(GFP_KERNEL, "/dev/disk/by-id/%s%*phN",			prefix, v->scsi.designator_len, v->scsi.designator);	if (!devname)		return ERR_PTR(-ENOMEM); 	if (tsk_is_kthread(current)) {		scoped_with_init_fs()			bdev_file = bdev_file_open_by_path(devname,					BLK_OPEN_READ | BLK_OPEN_WRITE,					NULL, NULL);	} else {		bdev_file = bdev_file_open_by_path(devname,				BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, NULL);	}	if (IS_ERR(bdev_file)) {		dprintk("failed to open device %s (%ld)\n",			devname, PTR_ERR(bdev_file));	} else {		pr_info("pNFS: using block device %s\n",			file_bdev(bdev_file)->bd_disk->disk_name);	} 	return bdev_file;} 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;	struct file *bdev_file;	int error; 	if (!bl_validate_designator(v))		return -EINVAL; 	/*	 * Try to open the RH/Fedora specific dm-mpath udev path first, as the	 * wwn- links will only point to the first discovered SCSI device there.	 * On other distributions like Debian, the default SCSI by-id path will	 * point to the dm-multipath device if one exists.	 */	bdev_file = bl_open_path(v, "dm-uuid-mpath-0x");	if (IS_ERR(bdev_file))		bdev_file = bl_open_path(v, "wwn-0x");	if (IS_ERR(bdev_file))		bdev_file = bl_open_path(v, "nvme-eui.");	if (IS_ERR(bdev_file)) {		pr_warn("pNFS: no device found for volume %*phN\n",			v->scsi.designator_len, v->scsi.designator);		return PTR_ERR(bdev_file);	}	d->bdev_file = bdev_file;	bdev = file_bdev(bdev_file); 	d->len = bdev_nr_bytes(bdev);	d->map = bl_map_simple;	d->pr_key = v->scsi.pr_key; 	if (d->len == 0) {		error = -ENODEV;		goto out_blkdev_put;	} 	ops = bdev->bd_disk->fops->pr_ops;	if (!ops) {		pr_err("pNFS: block device %s does not support reservations.",				bdev->bd_disk->disk_name);		error = -EINVAL;		goto out_blkdev_put;	} 	return 0; out_blkdev_put:	fput(d->bdev_file);	d->bdev_file = NULL;	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 = kzalloc_objs(struct pnfs_block_dev,				   v->concat.volumes_count, gfp_mask);	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) {			bl_free_device(&d->children[i]);			bl_free_device(d);			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;} 

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