[linux-2.6-block.git] / fs / nfsd / blocklayoutxdr.c

/*
 * Copyright (c) 2014-2016 Christoph Hellwig.
 */
#include <linux/sunrpc/svc.h>
#include <linux/exportfs.h>
#include <linux/iomap.h>
#include <linux/nfs4.h>

#include "nfsd.h"
#include "blocklayoutxdr.h"

#define NFSDDBG_FACILITY	NFSDDBG_PNFS


__be32
nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
		struct nfsd4_layoutget *lgp)
{
	struct pnfs_block_extent *b = lgp->lg_content;
	int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
	__be32 *p;

	p = xdr_reserve_space(xdr, sizeof(__be32) + len);
	if (!p)
		return nfserr_toosmall;

	*p++ = cpu_to_be32(len);
	*p++ = cpu_to_be32(1);		/* we always return a single extent */

	p = xdr_encode_opaque_fixed(p, &b->vol_id,
			sizeof(struct nfsd4_deviceid));
	p = xdr_encode_hyper(p, b->foff);
	p = xdr_encode_hyper(p, b->len);
	p = xdr_encode_hyper(p, b->soff);
	*p++ = cpu_to_be32(b->es);
	return 0;
}

static int
nfsd4_block_encode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
{
	__be32 *p;
	int len;

	switch (b->type) {
	case PNFS_BLOCK_VOLUME_SIMPLE:
		len = 4 + 4 + 8 + 4 + (XDR_QUADLEN(b->simple.sig_len) << 2);
		p = xdr_reserve_space(xdr, len);
		if (!p)
			return -ETOOSMALL;

		*p++ = cpu_to_be32(b->type);
		*p++ = cpu_to_be32(1);	/* single signature */
		p = xdr_encode_hyper(p, b->simple.offset);
		p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
		break;
	case PNFS_BLOCK_VOLUME_SCSI:
		len = 4 + 4 + 4 + 4 + (XDR_QUADLEN(b->scsi.designator_len) << 2) + 8;
		p = xdr_reserve_space(xdr, len);
		if (!p)
			return -ETOOSMALL;

		*p++ = cpu_to_be32(b->type);
		*p++ = cpu_to_be32(b->scsi.code_set);
		*p++ = cpu_to_be32(b->scsi.designator_type);
		p = xdr_encode_opaque(p, b->scsi.designator, b->scsi.designator_len);
		p = xdr_encode_hyper(p, b->scsi.pr_key);
		break;
	default:
		return -ENOTSUPP;
	}

	return len;
}

__be32
nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
		struct nfsd4_getdeviceinfo *gdp)
{
	struct pnfs_block_deviceaddr *dev = gdp->gd_device;
	int len = sizeof(__be32), ret, i;
	__be32 *p;

	p = xdr_reserve_space(xdr, len + sizeof(__be32));
	if (!p)
		return nfserr_resource;

	for (i = 0; i < dev->nr_volumes; i++) {
		ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
		if (ret < 0)
			return nfserrno(ret);
		len += ret;
	}

	/*
	 * Fill in the overall length and number of volumes at the beginning
	 * of the layout.
	 */
	*p++ = cpu_to_be32(len);
	*p++ = cpu_to_be32(dev->nr_volumes);
	return 0;
}

int
nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
		u32 block_size)
{
	struct iomap *iomaps;
	u32 nr_iomaps, i;

	if (len < sizeof(u32)) {
		dprintk("%s: extent array too small: %u\n", __func__, len);
		return -EINVAL;
	}
	len -= sizeof(u32);
	if (len % PNFS_BLOCK_EXTENT_SIZE) {
		dprintk("%s: extent array invalid: %u\n", __func__, len);
		return -EINVAL;
	}

	nr_iomaps = be32_to_cpup(p++);
	if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) {
		dprintk("%s: extent array size mismatch: %u/%u\n",
			__func__, len, nr_iomaps);
		return -EINVAL;
	}

	iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
	if (!iomaps) {
		dprintk("%s: failed to allocate extent array\n", __func__);
		return -ENOMEM;
	}

	for (i = 0; i < nr_iomaps; i++) {
		struct pnfs_block_extent bex;

		memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
		p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));

		p = xdr_decode_hyper(p, &bex.foff);
		if (bex.foff & (block_size - 1)) {
			dprintk("%s: unaligned offset 0x%llx\n",
				__func__, bex.foff);
			goto fail;
		}
		p = xdr_decode_hyper(p, &bex.len);
		if (bex.len & (block_size - 1)) {
			dprintk("%s: unaligned length 0x%llx\n",
				__func__, bex.foff);
			goto fail;
		}
		p = xdr_decode_hyper(p, &bex.soff);
		if (bex.soff & (block_size - 1)) {
			dprintk("%s: unaligned disk offset 0x%llx\n",
				__func__, bex.soff);
			goto fail;
		}
		bex.es = be32_to_cpup(p++);
		if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
			dprintk("%s: incorrect extent state %d\n",
				__func__, bex.es);
			goto fail;
		}

		iomaps[i].offset = bex.foff;
		iomaps[i].length = bex.len;
	}

	*iomapp = iomaps;
	return nr_iomaps;
fail:
	kfree(iomaps);
	return -EINVAL;
}

int
nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
		u32 block_size)
{
	struct iomap *iomaps;
	u32 nr_iomaps, expected, i;

	if (len < sizeof(u32)) {
		dprintk("%s: extent array too small: %u\n", __func__, len);
		return -EINVAL;
	}

	nr_iomaps = be32_to_cpup(p++);
	expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
	if (len != expected) {
		dprintk("%s: extent array size mismatch: %u/%u\n",
			__func__, len, expected);
		return -EINVAL;
	}

	iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
	if (!iomaps) {
		dprintk("%s: failed to allocate extent array\n", __func__);
		return -ENOMEM;
	}

	for (i = 0; i < nr_iomaps; i++) {
		u64 val;

		p = xdr_decode_hyper(p, &val);
		if (val & (block_size - 1)) {
			dprintk("%s: unaligned offset 0x%llx\n", __func__, val);
			goto fail;
		}
		iomaps[i].offset = val;

		p = xdr_decode_hyper(p, &val);
		if (val & (block_size - 1)) {
			dprintk("%s: unaligned length 0x%llx\n", __func__, val);
			goto fail;
		}
		iomaps[i].length = val;
	}

	*iomapp = iomaps;
	return nr_iomaps;
fail:
	kfree(iomaps);
	return -EINVAL;
}
Commit	Line	Data
8650b8a0	1	/*
f99d4fbd	2	* Copyright (c) 2014-2016 Christoph Hellwig.
8650b8a0 CH	3	*/
	4	#include <linux/sunrpc/svc.h>
	5	#include <linux/exportfs.h>
199a31c6	6	#include <linux/iomap.h>
8650b8a0 CH	7	#include <linux/nfs4.h>
	8
	9	#include "nfsd.h"
	10	#include "blocklayoutxdr.h"
	11
	12	#define NFSDDBG_FACILITY NFSDDBG_PNFS
	13
	14
	15	__be32
	16	nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
	17	struct nfsd4_layoutget *lgp)
	18	{
	19	struct pnfs_block_extent *b = lgp->lg_content;
	20	int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
	21	__be32 *p;
	22
	23	p = xdr_reserve_space(xdr, sizeof(__be32) + len);
	24	if (!p)
	25	return nfserr_toosmall;
	26
	27	*p++ = cpu_to_be32(len);
	28	p++ = cpu_to_be32(1); / we always return a single extent */
	29
	30	p = xdr_encode_opaque_fixed(p, &b->vol_id,
	31	sizeof(struct nfsd4_deviceid));
	32	p = xdr_encode_hyper(p, b->foff);
	33	p = xdr_encode_hyper(p, b->len);
	34	p = xdr_encode_hyper(p, b->soff);
	35	*p++ = cpu_to_be32(b->es);
	36	return 0;
	37	}
	38
	39	static int
	40	nfsd4_block_encode_volume(struct xdr_stream xdr, struct pnfs_block_volume b)
	41	{
	42	__be32 *p;
	43	int len;
	44
	45	switch (b->type) {
	46	case PNFS_BLOCK_VOLUME_SIMPLE:
dd51db18	47	len = 4 + 4 + 8 + 4 + (XDR_QUADLEN(b->simple.sig_len) << 2);
8650b8a0 CH	48	p = xdr_reserve_space(xdr, len);
	49	if (!p)
	50	return -ETOOSMALL;
	51
	52	*p++ = cpu_to_be32(b->type);
	53	p++ = cpu_to_be32(1); / single signature */
	54	p = xdr_encode_hyper(p, b->simple.offset);
	55	p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
	56	break;
f99d4fbd	57	case PNFS_BLOCK_VOLUME_SCSI:
dd51db18	58	len = 4 + 4 + 4 + 4 + (XDR_QUADLEN(b->scsi.designator_len) << 2) + 8;
f99d4fbd CH	59	p = xdr_reserve_space(xdr, len);
	60	if (!p)
	61	return -ETOOSMALL;
	62
	63	*p++ = cpu_to_be32(b->type);
	64	*p++ = cpu_to_be32(b->scsi.code_set);
	65	*p++ = cpu_to_be32(b->scsi.designator_type);
	66	p = xdr_encode_opaque(p, b->scsi.designator, b->scsi.designator_len);
	67	p = xdr_encode_hyper(p, b->scsi.pr_key);
	68	break;
8650b8a0 CH	69	default:
	70	return -ENOTSUPP;
	71	}
	72
	73	return len;
	74	}
	75
	76	__be32
	77	nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
	78	struct nfsd4_getdeviceinfo *gdp)
	79	{
	80	struct pnfs_block_deviceaddr *dev = gdp->gd_device;
	81	int len = sizeof(__be32), ret, i;
	82	__be32 *p;
	83
	84	p = xdr_reserve_space(xdr, len + sizeof(__be32));
	85	if (!p)
	86	return nfserr_resource;
	87
	88	for (i = 0; i < dev->nr_volumes; i++) {
	89	ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
	90	if (ret < 0)
	91	return nfserrno(ret);
	92	len += ret;
	93	}
	94
	95	/*
	96	* Fill in the overall length and number of volumes at the beginning
	97	* of the layout.
	98	*/
	99	*p++ = cpu_to_be32(len);
	100	*p++ = cpu_to_be32(dev->nr_volumes);
	101	return 0;
	102	}
	103
	104	int
	105	nfsd4_block_decode_layoutupdate(__be32 p, u32 len, struct iomap *iomapp,
	106	u32 block_size)
	107	{
	108	struct iomap *iomaps;
4b15da44	109	u32 nr_iomaps, i;
8650b8a0 CH	110
	111	if (len < sizeof(u32)) {
	112	dprintk("%s: extent array too small: %u\n", __func__, len);
	113	return -EINVAL;
	114	}
4b15da44 BF	115	len -= sizeof(u32);
	116	if (len % PNFS_BLOCK_EXTENT_SIZE) {
	117	dprintk("%s: extent array invalid: %u\n", __func__, len);
	118	return -EINVAL;
	119	}
8650b8a0 CH	120
8650b8a0 CH	121	nr_iomaps = be32_to_cpup(p++);
4b15da44	122	if (nr_iomaps != len / PNFS_BLOCK_EXTENT_SIZE) {
8650b8a0	123	dprintk("%s: extent array size mismatch: %u/%u\n",
4b15da44	124	__func__, len, nr_iomaps);
8650b8a0 CH	125	return -EINVAL;
	126	}
	127
	128	iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
	129	if (!iomaps) {
	130	dprintk("%s: failed to allocate extent array\n", __func__);
	131	return -ENOMEM;
	132	}
	133
	134	for (i = 0; i < nr_iomaps; i++) {
	135	struct pnfs_block_extent bex;
	136
	137	memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
	138	p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
	139
	140	p = xdr_decode_hyper(p, &bex.foff);
	141	if (bex.foff & (block_size - 1)) {
85369523	142	dprintk("%s: unaligned offset 0x%llx\n",
8650b8a0 CH	143	__func__, bex.foff);
	144	goto fail;
	145	}
	146	p = xdr_decode_hyper(p, &bex.len);
	147	if (bex.len & (block_size - 1)) {
85369523	148	dprintk("%s: unaligned length 0x%llx\n",
8650b8a0 CH	149	__func__, bex.foff);
	150	goto fail;
	151	}
	152	p = xdr_decode_hyper(p, &bex.soff);
	153	if (bex.soff & (block_size - 1)) {
85369523	154	dprintk("%s: unaligned disk offset 0x%llx\n",
8650b8a0 CH	155	__func__, bex.soff);
	156	goto fail;
	157	}
	158	bex.es = be32_to_cpup(p++);
	159	if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
	160	dprintk("%s: incorrect extent state %d\n",
	161	__func__, bex.es);
	162	goto fail;
	163	}
	164
	165	iomaps[i].offset = bex.foff;
	166	iomaps[i].length = bex.len;
	167	}
	168
	169	*iomapp = iomaps;
	170	return nr_iomaps;
	171	fail:
	172	kfree(iomaps);
	173	return -EINVAL;
	174	}
f99d4fbd CH	175
	176	int
	177	nfsd4_scsi_decode_layoutupdate(__be32 p, u32 len, struct iomap *iomapp,
	178	u32 block_size)
	179	{
	180	struct iomap *iomaps;
	181	u32 nr_iomaps, expected, i;
	182
	183	if (len < sizeof(u32)) {
	184	dprintk("%s: extent array too small: %u\n", __func__, len);
	185	return -EINVAL;
	186	}
	187
	188	nr_iomaps = be32_to_cpup(p++);
	189	expected = sizeof(__be32) + nr_iomaps * PNFS_SCSI_RANGE_SIZE;
	190	if (len != expected) {
	191	dprintk("%s: extent array size mismatch: %u/%u\n",
	192	__func__, len, expected);
	193	return -EINVAL;
	194	}
	195
	196	iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
	197	if (!iomaps) {
	198	dprintk("%s: failed to allocate extent array\n", __func__);
	199	return -ENOMEM;
	200	}
	201
	202	for (i = 0; i < nr_iomaps; i++) {
	203	u64 val;
	204
	205	p = xdr_decode_hyper(p, &val);
	206	if (val & (block_size - 1)) {
	207	dprintk("%s: unaligned offset 0x%llx\n", __func__, val);
	208	goto fail;
	209	}
	210	iomaps[i].offset = val;
	211
	212	p = xdr_decode_hyper(p, &val);
	213	if (val & (block_size - 1)) {
	214	dprintk("%s: unaligned length 0x%llx\n", __func__, val);
	215	goto fail;
	216	}
	217	iomaps[i].length = val;
	218	}
	219
	220	*iomapp = iomaps;
	221	return nr_iomaps;
	222	fail:
	223	kfree(iomaps);
	224	return -EINVAL;
	225	}