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 0x%llx\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 0x%llx\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 0x%llx\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 } 158