blob: 9da89fddab338fcebbeb51fc0ec71534e0defc5a [file] [log] [blame]
Christoph Hellwig8650b8a2015-01-21 11:40:00 +01001/*
2 * Copyright (c) 2014 Christoph Hellwig.
3 */
4#include <linux/sunrpc/svc.h>
5#include <linux/exportfs.h>
6#include <linux/nfs4.h>
7
8#include "nfsd.h"
9#include "blocklayoutxdr.h"
10
11#define NFSDDBG_FACILITY NFSDDBG_PNFS
12
13
14__be32
15nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
16 struct nfsd4_layoutget *lgp)
17{
18 struct pnfs_block_extent *b = lgp->lg_content;
19 int len = sizeof(__be32) + 5 * sizeof(__be64) + sizeof(__be32);
20 __be32 *p;
21
22 p = xdr_reserve_space(xdr, sizeof(__be32) + len);
23 if (!p)
24 return nfserr_toosmall;
25
26 *p++ = cpu_to_be32(len);
27 *p++ = cpu_to_be32(1); /* we always return a single extent */
28
29 p = xdr_encode_opaque_fixed(p, &b->vol_id,
30 sizeof(struct nfsd4_deviceid));
31 p = xdr_encode_hyper(p, b->foff);
32 p = xdr_encode_hyper(p, b->len);
33 p = xdr_encode_hyper(p, b->soff);
34 *p++ = cpu_to_be32(b->es);
35 return 0;
36}
37
38static int
39nfsd4_block_encode_volume(struct xdr_stream *xdr, struct pnfs_block_volume *b)
40{
41 __be32 *p;
42 int len;
43
44 switch (b->type) {
45 case PNFS_BLOCK_VOLUME_SIMPLE:
46 len = 4 + 4 + 8 + 4 + b->simple.sig_len;
47 p = xdr_reserve_space(xdr, len);
48 if (!p)
49 return -ETOOSMALL;
50
51 *p++ = cpu_to_be32(b->type);
52 *p++ = cpu_to_be32(1); /* single signature */
53 p = xdr_encode_hyper(p, b->simple.offset);
54 p = xdr_encode_opaque(p, b->simple.sig, b->simple.sig_len);
55 break;
56 default:
57 return -ENOTSUPP;
58 }
59
60 return len;
61}
62
63__be32
64nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
65 struct nfsd4_getdeviceinfo *gdp)
66{
67 struct pnfs_block_deviceaddr *dev = gdp->gd_device;
68 int len = sizeof(__be32), ret, i;
69 __be32 *p;
70
71 p = xdr_reserve_space(xdr, len + sizeof(__be32));
72 if (!p)
73 return nfserr_resource;
74
75 for (i = 0; i < dev->nr_volumes; i++) {
76 ret = nfsd4_block_encode_volume(xdr, &dev->volumes[i]);
77 if (ret < 0)
78 return nfserrno(ret);
79 len += ret;
80 }
81
82 /*
83 * Fill in the overall length and number of volumes at the beginning
84 * of the layout.
85 */
86 *p++ = cpu_to_be32(len);
87 *p++ = cpu_to_be32(dev->nr_volumes);
88 return 0;
89}
90
91int
92nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
93 u32 block_size)
94{
95 struct iomap *iomaps;
96 u32 nr_iomaps, expected, i;
97
98 if (len < sizeof(u32)) {
99 dprintk("%s: extent array too small: %u\n", __func__, len);
100 return -EINVAL;
101 }
102
103 nr_iomaps = be32_to_cpup(p++);
104 expected = sizeof(__be32) + nr_iomaps * NFS4_BLOCK_EXTENT_SIZE;
105 if (len != expected) {
106 dprintk("%s: extent array size mismatch: %u/%u\n",
107 __func__, len, expected);
108 return -EINVAL;
109 }
110
111 iomaps = kcalloc(nr_iomaps, sizeof(*iomaps), GFP_KERNEL);
112 if (!iomaps) {
113 dprintk("%s: failed to allocate extent array\n", __func__);
114 return -ENOMEM;
115 }
116
117 for (i = 0; i < nr_iomaps; i++) {
118 struct pnfs_block_extent bex;
119
120 memcpy(&bex.vol_id, p, sizeof(struct nfsd4_deviceid));
121 p += XDR_QUADLEN(sizeof(struct nfsd4_deviceid));
122
123 p = xdr_decode_hyper(p, &bex.foff);
124 if (bex.foff & (block_size - 1)) {
125 dprintk("%s: unaligned offset %lld\n",
126 __func__, bex.foff);
127 goto fail;
128 }
129 p = xdr_decode_hyper(p, &bex.len);
130 if (bex.len & (block_size - 1)) {
131 dprintk("%s: unaligned length %lld\n",
132 __func__, bex.foff);
133 goto fail;
134 }
135 p = xdr_decode_hyper(p, &bex.soff);
136 if (bex.soff & (block_size - 1)) {
137 dprintk("%s: unaligned disk offset %lld\n",
138 __func__, bex.soff);
139 goto fail;
140 }
141 bex.es = be32_to_cpup(p++);
142 if (bex.es != PNFS_BLOCK_READWRITE_DATA) {
143 dprintk("%s: incorrect extent state %d\n",
144 __func__, bex.es);
145 goto fail;
146 }
147
148 iomaps[i].offset = bex.foff;
149 iomaps[i].length = bex.len;
150 }
151
152 *iomapp = iomaps;
153 return nr_iomaps;
154fail:
155 kfree(iomaps);
156 return -EINVAL;
157}