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// SPDX-License-Identifier: GPL-2.0
/*
* 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"
#include "vfs.h"
#define NFSDDBG_FACILITY NFSDDBG_PNFS
__be32
nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
const struct nfsd4_layoutget *lgp)
{
const 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;
/*
* See paragraph 5 of RFC 8881 S18.40.3.
*/
if (!gdp->gd_maxcount) {
if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
return nfserr_resource;
return nfs_ok;
}
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;
}
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