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8650b8a0 CH |
1 | /* |
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 | |
15 | nfsd4_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 | ||
38 | static int | |
39 | nfsd4_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 | |
64 | nfsd4_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 | ||
91 | int | |
92 | nfsd4_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; | |
154 | fail: | |
155 | kfree(iomaps); | |
156 | return -EINVAL; | |
157 | } |