Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/nfs2xdr.c |
| 3 | * |
| 4 | * XDR functions to encode/decode NFS RPC arguments and results. |
| 5 | * |
| 6 | * Copyright (C) 1992, 1993, 1994 Rick Sladkey |
| 7 | * Copyright (C) 1996 Olaf Kirch |
| 8 | * 04 Aug 1998 Ion Badulescu <ionut@cs.columbia.edu> |
| 9 | * FIFO's need special handling in NFSv2 |
| 10 | */ |
| 11 | |
| 12 | #include <linux/param.h> |
| 13 | #include <linux/time.h> |
| 14 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/errno.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/in.h> |
| 18 | #include <linux/pagemap.h> |
| 19 | #include <linux/proc_fs.h> |
| 20 | #include <linux/sunrpc/clnt.h> |
| 21 | #include <linux/nfs.h> |
| 22 | #include <linux/nfs2.h> |
| 23 | #include <linux/nfs_fs.h> |
Trond Myklebust | 816724e | 2006-06-24 08:41:41 -0400 | [diff] [blame] | 24 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #define NFSDBG_FACILITY NFSDBG_XDR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | /* Mapping from NFS error code to "errno" error code. */ |
| 29 | #define errno_NFSERR_IO EIO |
| 30 | |
| 31 | /* |
| 32 | * Declare the space requirements for NFS arguments and replies as |
| 33 | * number of 32bit-words |
| 34 | */ |
| 35 | #define NFS_fhandle_sz (8) |
| 36 | #define NFS_sattr_sz (8) |
| 37 | #define NFS_filename_sz (1+(NFS2_MAXNAMLEN>>2)) |
| 38 | #define NFS_path_sz (1+(NFS2_MAXPATHLEN>>2)) |
| 39 | #define NFS_fattr_sz (17) |
| 40 | #define NFS_info_sz (5) |
| 41 | #define NFS_entry_sz (NFS_filename_sz+3) |
| 42 | |
| 43 | #define NFS_diropargs_sz (NFS_fhandle_sz+NFS_filename_sz) |
Trond Myklebust | 4fdc17b | 2007-07-14 15:39:57 -0400 | [diff] [blame] | 44 | #define NFS_removeargs_sz (NFS_fhandle_sz+NFS_filename_sz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #define NFS_sattrargs_sz (NFS_fhandle_sz+NFS_sattr_sz) |
| 46 | #define NFS_readlinkargs_sz (NFS_fhandle_sz) |
| 47 | #define NFS_readargs_sz (NFS_fhandle_sz+3) |
| 48 | #define NFS_writeargs_sz (NFS_fhandle_sz+4) |
| 49 | #define NFS_createargs_sz (NFS_diropargs_sz+NFS_sattr_sz) |
| 50 | #define NFS_renameargs_sz (NFS_diropargs_sz+NFS_diropargs_sz) |
| 51 | #define NFS_linkargs_sz (NFS_fhandle_sz+NFS_diropargs_sz) |
Chuck Lever | 94a6d75 | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 52 | #define NFS_symlinkargs_sz (NFS_diropargs_sz+1+NFS_sattr_sz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #define NFS_readdirargs_sz (NFS_fhandle_sz+2) |
| 54 | |
| 55 | #define NFS_attrstat_sz (1+NFS_fattr_sz) |
| 56 | #define NFS_diropres_sz (1+NFS_fhandle_sz+NFS_fattr_sz) |
| 57 | #define NFS_readlinkres_sz (2) |
| 58 | #define NFS_readres_sz (1+NFS_fattr_sz+1) |
| 59 | #define NFS_writeres_sz (NFS_attrstat_sz) |
| 60 | #define NFS_stat_sz (1) |
| 61 | #define NFS_readdirres_sz (1) |
| 62 | #define NFS_statfsres_sz (1+NFS_info_sz) |
| 63 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 64 | |
| 65 | /* |
| 66 | * While encoding arguments, set up the reply buffer in advance to |
| 67 | * receive reply data directly into the page cache. |
| 68 | */ |
| 69 | static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages, |
| 70 | unsigned int base, unsigned int len, |
| 71 | unsigned int bufsize) |
| 72 | { |
| 73 | struct rpc_auth *auth = req->rq_cred->cr_auth; |
| 74 | unsigned int replen; |
| 75 | |
| 76 | replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize; |
| 77 | xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len); |
| 78 | } |
| 79 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 80 | /* |
| 81 | * Handle decode buffer overflows out-of-line. |
| 82 | */ |
| 83 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) |
| 84 | { |
| 85 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
| 86 | "Remaining buffer length is %tu words.\n", |
| 87 | func, xdr->end - xdr->p); |
| 88 | } |
| 89 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /* |
| 92 | * Common NFS XDR functions as inlines |
| 93 | */ |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 94 | static inline __be32 * |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 95 | xdr_decode_fhandle(__be32 *p, struct nfs_fh *fhandle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | /* NFSv2 handles have a fixed length */ |
| 98 | fhandle->size = NFS2_FHSIZE; |
| 99 | memcpy(fhandle->data, p, NFS2_FHSIZE); |
| 100 | return p + XDR_QUADLEN(NFS2_FHSIZE); |
| 101 | } |
| 102 | |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 103 | static inline __be32* |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 104 | xdr_decode_time(__be32 *p, struct timespec *timep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
| 106 | timep->tv_sec = ntohl(*p++); |
| 107 | /* Convert microseconds into nanoseconds */ |
| 108 | timep->tv_nsec = ntohl(*p++) * 1000; |
| 109 | return p; |
| 110 | } |
| 111 | |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 112 | static __be32 * |
| 113 | xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
Trond Myklebust | bca7947 | 2009-03-11 14:10:26 -0400 | [diff] [blame] | 115 | u32 rdev, type; |
| 116 | type = ntohl(*p++); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | fattr->mode = ntohl(*p++); |
| 118 | fattr->nlink = ntohl(*p++); |
| 119 | fattr->uid = ntohl(*p++); |
| 120 | fattr->gid = ntohl(*p++); |
| 121 | fattr->size = ntohl(*p++); |
| 122 | fattr->du.nfs2.blocksize = ntohl(*p++); |
| 123 | rdev = ntohl(*p++); |
| 124 | fattr->du.nfs2.blocks = ntohl(*p++); |
Trond Myklebust | 8b4bdcf | 2006-06-09 09:34:19 -0400 | [diff] [blame] | 125 | fattr->fsid.major = ntohl(*p++); |
| 126 | fattr->fsid.minor = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | fattr->fileid = ntohl(*p++); |
| 128 | p = xdr_decode_time(p, &fattr->atime); |
| 129 | p = xdr_decode_time(p, &fattr->mtime); |
| 130 | p = xdr_decode_time(p, &fattr->ctime); |
Trond Myklebust | 9e6e70f | 2009-03-11 14:10:24 -0400 | [diff] [blame] | 131 | fattr->valid |= NFS_ATTR_FATTR_V2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | fattr->rdev = new_decode_dev(rdev); |
Trond Myklebust | bca7947 | 2009-03-11 14:10:26 -0400 | [diff] [blame] | 133 | if (type == NFCHR && rdev == NFS2_FIFO_DEV) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO; |
| 135 | fattr->rdev = 0; |
| 136 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | return p; |
| 138 | } |
| 139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 141 | * Encode/decode NFSv2 basic data types |
| 142 | * |
| 143 | * Basic NFSv2 data types are defined in section 2.3 of RFC 1094: |
| 144 | * "NFS: Network File System Protocol Specification". |
| 145 | * |
| 146 | * Not all basic data types have their own encoding and decoding |
| 147 | * functions. For run-time efficiency, some data types are encoded |
| 148 | * or decoded inline. |
| 149 | */ |
| 150 | |
| 151 | /* |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 152 | * typedef opaque nfsdata<>; |
| 153 | */ |
| 154 | static int decode_nfsdata(struct xdr_stream *xdr, struct nfs_readres *result) |
| 155 | { |
| 156 | u32 recvd, count; |
| 157 | size_t hdrlen; |
| 158 | __be32 *p; |
| 159 | |
| 160 | p = xdr_inline_decode(xdr, 4); |
| 161 | if (unlikely(p == NULL)) |
| 162 | goto out_overflow; |
| 163 | count = be32_to_cpup(p); |
| 164 | hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base; |
| 165 | recvd = xdr->buf->len - hdrlen; |
| 166 | if (unlikely(count > recvd)) |
| 167 | goto out_cheating; |
| 168 | out: |
| 169 | xdr_read_pages(xdr, count); |
| 170 | result->eof = 0; /* NFSv2 does not pass EOF flag on the wire. */ |
| 171 | result->count = count; |
| 172 | return count; |
| 173 | out_cheating: |
| 174 | dprintk("NFS: server cheating in read result: " |
| 175 | "count %u > recvd %u\n", count, recvd); |
| 176 | count = recvd; |
| 177 | goto out; |
| 178 | out_overflow: |
| 179 | print_overflow_msg(__func__, xdr); |
| 180 | return -EIO; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * enum stat { |
| 185 | * NFS_OK = 0, |
| 186 | * NFSERR_PERM = 1, |
| 187 | * NFSERR_NOENT = 2, |
| 188 | * NFSERR_IO = 5, |
| 189 | * NFSERR_NXIO = 6, |
| 190 | * NFSERR_ACCES = 13, |
| 191 | * NFSERR_EXIST = 17, |
| 192 | * NFSERR_NODEV = 19, |
| 193 | * NFSERR_NOTDIR = 20, |
| 194 | * NFSERR_ISDIR = 21, |
| 195 | * NFSERR_FBIG = 27, |
| 196 | * NFSERR_NOSPC = 28, |
| 197 | * NFSERR_ROFS = 30, |
| 198 | * NFSERR_NAMETOOLONG = 63, |
| 199 | * NFSERR_NOTEMPTY = 66, |
| 200 | * NFSERR_DQUOT = 69, |
| 201 | * NFSERR_STALE = 70, |
| 202 | * NFSERR_WFLUSH = 99 |
| 203 | * }; |
| 204 | */ |
| 205 | static int decode_stat(struct xdr_stream *xdr, enum nfs_stat *status) |
| 206 | { |
| 207 | __be32 *p; |
| 208 | |
| 209 | p = xdr_inline_decode(xdr, 4); |
| 210 | if (unlikely(p == NULL)) |
| 211 | goto out_overflow; |
| 212 | *status = be32_to_cpup(p); |
| 213 | return 0; |
| 214 | out_overflow: |
| 215 | print_overflow_msg(__func__, xdr); |
| 216 | return -EIO; |
| 217 | } |
| 218 | |
| 219 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 220 | * 2.3.3. fhandle |
| 221 | * |
| 222 | * typedef opaque fhandle[FHSIZE]; |
| 223 | */ |
| 224 | static void encode_fhandle(struct xdr_stream *xdr, const struct nfs_fh *fh) |
| 225 | { |
| 226 | __be32 *p; |
| 227 | |
| 228 | BUG_ON(fh->size != NFS2_FHSIZE); |
| 229 | p = xdr_reserve_space(xdr, NFS2_FHSIZE); |
| 230 | memcpy(p, fh->data, NFS2_FHSIZE); |
| 231 | } |
| 232 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 233 | static int decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh) |
| 234 | { |
| 235 | __be32 *p; |
| 236 | |
| 237 | p = xdr_inline_decode(xdr, NFS2_FHSIZE); |
| 238 | if (unlikely(p == NULL)) |
| 239 | goto out_overflow; |
| 240 | fh->size = NFS2_FHSIZE; |
| 241 | memcpy(fh->data, p, NFS2_FHSIZE); |
| 242 | return 0; |
| 243 | out_overflow: |
| 244 | print_overflow_msg(__func__, xdr); |
| 245 | return -EIO; |
| 246 | } |
| 247 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 248 | /* |
Chuck Lever | 282ac2a | 2010-12-14 14:54:50 +0000 | [diff] [blame] | 249 | * 2.3.4. timeval |
| 250 | * |
| 251 | * struct timeval { |
| 252 | * unsigned int seconds; |
| 253 | * unsigned int useconds; |
| 254 | * }; |
| 255 | */ |
| 256 | static __be32 *xdr_encode_time(__be32 *p, const struct timespec *timep) |
| 257 | { |
| 258 | *p++ = cpu_to_be32(timep->tv_sec); |
| 259 | if (timep->tv_nsec != 0) |
| 260 | *p++ = cpu_to_be32(timep->tv_nsec / NSEC_PER_USEC); |
| 261 | else |
| 262 | *p++ = cpu_to_be32(0); |
| 263 | return p; |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Passing the invalid value useconds=1000000 is a Sun convention for |
| 268 | * "set to current server time". It's needed to make permissions checks |
| 269 | * for the "touch" program across v2 mounts to Solaris and Irix servers |
| 270 | * work correctly. See description of sattr in section 6.1 of "NFS |
| 271 | * Illustrated" by Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5. |
| 272 | */ |
| 273 | static __be32 *xdr_encode_current_server_time(__be32 *p, |
| 274 | const struct timespec *timep) |
| 275 | { |
| 276 | *p++ = cpu_to_be32(timep->tv_sec); |
| 277 | *p++ = cpu_to_be32(1000000); |
| 278 | return p; |
| 279 | } |
| 280 | |
| 281 | /* |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 282 | * 2.3.5. fattr |
| 283 | * |
| 284 | * struct fattr { |
| 285 | * ftype type; |
| 286 | * unsigned int mode; |
| 287 | * unsigned int nlink; |
| 288 | * unsigned int uid; |
| 289 | * unsigned int gid; |
| 290 | * unsigned int size; |
| 291 | * unsigned int blocksize; |
| 292 | * unsigned int rdev; |
| 293 | * unsigned int blocks; |
| 294 | * unsigned int fsid; |
| 295 | * unsigned int fileid; |
| 296 | * timeval atime; |
| 297 | * timeval mtime; |
| 298 | * timeval ctime; |
| 299 | * }; |
| 300 | * |
| 301 | */ |
| 302 | static int decode_fattr(struct xdr_stream *xdr, struct nfs_fattr *fattr) |
| 303 | { |
| 304 | __be32 *p; |
| 305 | |
| 306 | p = xdr_inline_decode(xdr, NFS_fattr_sz << 2); |
| 307 | if (unlikely(p == NULL)) |
| 308 | goto out_overflow; |
| 309 | xdr_decode_fattr(p, fattr); |
| 310 | return 0; |
| 311 | out_overflow: |
| 312 | print_overflow_msg(__func__, xdr); |
| 313 | return -EIO; |
| 314 | } |
| 315 | |
| 316 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 317 | * 2.3.6. sattr |
| 318 | * |
| 319 | * struct sattr { |
| 320 | * unsigned int mode; |
| 321 | * unsigned int uid; |
| 322 | * unsigned int gid; |
| 323 | * unsigned int size; |
| 324 | * timeval atime; |
| 325 | * timeval mtime; |
| 326 | * }; |
| 327 | */ |
| 328 | |
| 329 | #define NFS2_SATTR_NOT_SET (0xffffffff) |
| 330 | |
| 331 | static __be32 *xdr_time_not_set(__be32 *p) |
| 332 | { |
| 333 | *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); |
| 334 | *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); |
| 335 | return p; |
| 336 | } |
| 337 | |
| 338 | static void encode_sattr(struct xdr_stream *xdr, const struct iattr *attr) |
| 339 | { |
| 340 | __be32 *p; |
| 341 | |
| 342 | p = xdr_reserve_space(xdr, NFS_sattr_sz << 2); |
| 343 | |
| 344 | if (attr->ia_valid & ATTR_MODE) |
| 345 | *p++ = cpu_to_be32(attr->ia_mode); |
| 346 | else |
| 347 | *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); |
| 348 | if (attr->ia_valid & ATTR_UID) |
| 349 | *p++ = cpu_to_be32(attr->ia_uid); |
| 350 | else |
| 351 | *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); |
| 352 | if (attr->ia_valid & ATTR_GID) |
| 353 | *p++ = cpu_to_be32(attr->ia_gid); |
| 354 | else |
| 355 | *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); |
| 356 | if (attr->ia_valid & ATTR_SIZE) |
| 357 | *p++ = cpu_to_be32((u32)attr->ia_size); |
| 358 | else |
| 359 | *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); |
| 360 | |
| 361 | if (attr->ia_valid & ATTR_ATIME_SET) |
| 362 | p = xdr_encode_time(p, &attr->ia_atime); |
| 363 | else if (attr->ia_valid & ATTR_ATIME) |
| 364 | p = xdr_encode_current_server_time(p, &attr->ia_atime); |
| 365 | else |
| 366 | p = xdr_time_not_set(p); |
| 367 | if (attr->ia_valid & ATTR_MTIME_SET) |
| 368 | xdr_encode_time(p, &attr->ia_mtime); |
| 369 | else if (attr->ia_valid & ATTR_MTIME) |
| 370 | xdr_encode_current_server_time(p, &attr->ia_mtime); |
| 371 | else |
| 372 | xdr_time_not_set(p); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * 2.3.7. filename |
| 377 | * |
| 378 | * typedef string filename<MAXNAMLEN>; |
| 379 | */ |
| 380 | static void encode_filename(struct xdr_stream *xdr, |
| 381 | const char *name, u32 length) |
| 382 | { |
| 383 | __be32 *p; |
| 384 | |
| 385 | BUG_ON(length > NFS2_MAXNAMLEN); |
| 386 | p = xdr_reserve_space(xdr, 4 + length); |
| 387 | xdr_encode_opaque(p, name, length); |
| 388 | } |
| 389 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 390 | static int decode_filename_inline(struct xdr_stream *xdr, |
| 391 | const char **name, u32 *length) |
| 392 | { |
| 393 | __be32 *p; |
| 394 | u32 count; |
| 395 | |
| 396 | p = xdr_inline_decode(xdr, 4); |
| 397 | if (unlikely(p == NULL)) |
| 398 | goto out_overflow; |
| 399 | count = be32_to_cpup(p); |
| 400 | if (count > NFS3_MAXNAMLEN) |
| 401 | goto out_nametoolong; |
| 402 | p = xdr_inline_decode(xdr, count); |
| 403 | if (unlikely(p == NULL)) |
| 404 | goto out_overflow; |
| 405 | *name = (const char *)p; |
| 406 | *length = count; |
| 407 | return 0; |
| 408 | out_nametoolong: |
| 409 | dprintk("NFS: returned filename too long: %u\n", count); |
| 410 | return -ENAMETOOLONG; |
| 411 | out_overflow: |
| 412 | print_overflow_msg(__func__, xdr); |
| 413 | return -EIO; |
| 414 | } |
| 415 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 416 | /* |
| 417 | * 2.3.8. path |
| 418 | * |
| 419 | * typedef string path<MAXPATHLEN>; |
| 420 | */ |
| 421 | static void encode_path(struct xdr_stream *xdr, struct page **pages, u32 length) |
| 422 | { |
| 423 | __be32 *p; |
| 424 | |
| 425 | BUG_ON(length > NFS2_MAXPATHLEN); |
| 426 | p = xdr_reserve_space(xdr, 4); |
| 427 | *p = cpu_to_be32(length); |
| 428 | xdr_write_pages(xdr, pages, 0, length); |
| 429 | } |
| 430 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 431 | static int decode_path(struct xdr_stream *xdr) |
| 432 | { |
| 433 | u32 length, recvd; |
| 434 | size_t hdrlen; |
| 435 | __be32 *p; |
| 436 | |
| 437 | p = xdr_inline_decode(xdr, 4); |
| 438 | if (unlikely(p == NULL)) |
| 439 | goto out_overflow; |
| 440 | length = be32_to_cpup(p); |
| 441 | if (unlikely(length >= xdr->buf->page_len || length > NFS_MAXPATHLEN)) |
| 442 | goto out_size; |
| 443 | hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base; |
| 444 | recvd = xdr->buf->len - hdrlen; |
| 445 | if (unlikely(length > recvd)) |
| 446 | goto out_cheating; |
| 447 | |
| 448 | xdr_read_pages(xdr, length); |
| 449 | xdr_terminate_string(xdr->buf, length); |
| 450 | return 0; |
| 451 | out_size: |
| 452 | dprintk("NFS: returned pathname too long: %u\n", length); |
| 453 | return -ENAMETOOLONG; |
| 454 | out_cheating: |
| 455 | dprintk("NFS: server cheating in pathname result: " |
| 456 | "length %u > received %u\n", length, recvd); |
| 457 | return -EIO; |
| 458 | out_overflow: |
| 459 | print_overflow_msg(__func__, xdr); |
| 460 | return -EIO; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * 2.3.9. attrstat |
| 465 | * |
| 466 | * union attrstat switch (stat status) { |
| 467 | * case NFS_OK: |
| 468 | * fattr attributes; |
| 469 | * default: |
| 470 | * void; |
| 471 | * }; |
| 472 | */ |
| 473 | static int decode_attrstat(struct xdr_stream *xdr, struct nfs_fattr *result) |
| 474 | { |
| 475 | enum nfs_stat status; |
| 476 | int error; |
| 477 | |
| 478 | error = decode_stat(xdr, &status); |
| 479 | if (unlikely(error)) |
| 480 | goto out; |
| 481 | if (status != NFS_OK) |
| 482 | goto out_default; |
| 483 | error = decode_fattr(xdr, result); |
| 484 | out: |
| 485 | return error; |
| 486 | out_default: |
| 487 | return nfs_stat_to_errno(status); |
| 488 | } |
| 489 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 490 | /* |
| 491 | * 2.3.10. diropargs |
| 492 | * |
| 493 | * struct diropargs { |
| 494 | * fhandle dir; |
| 495 | * filename name; |
| 496 | * }; |
| 497 | */ |
| 498 | static void encode_diropargs(struct xdr_stream *xdr, const struct nfs_fh *fh, |
| 499 | const char *name, u32 length) |
| 500 | { |
| 501 | encode_fhandle(xdr, fh); |
| 502 | encode_filename(xdr, name, length); |
| 503 | } |
| 504 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 505 | /* |
| 506 | * 2.3.11. diropres |
| 507 | * |
| 508 | * union diropres switch (stat status) { |
| 509 | * case NFS_OK: |
| 510 | * struct { |
| 511 | * fhandle file; |
| 512 | * fattr attributes; |
| 513 | * } diropok; |
| 514 | * default: |
| 515 | * void; |
| 516 | * }; |
| 517 | */ |
| 518 | static int decode_diropok(struct xdr_stream *xdr, struct nfs_diropok *result) |
| 519 | { |
| 520 | int error; |
| 521 | |
| 522 | error = decode_fhandle(xdr, result->fh); |
| 523 | if (unlikely(error)) |
| 524 | goto out; |
| 525 | error = decode_fattr(xdr, result->fattr); |
| 526 | out: |
| 527 | return error; |
| 528 | } |
| 529 | |
| 530 | static int decode_diropres(struct xdr_stream *xdr, struct nfs_diropok *result) |
| 531 | { |
| 532 | enum nfs_stat status; |
| 533 | int error; |
| 534 | |
| 535 | error = decode_stat(xdr, &status); |
| 536 | if (unlikely(error)) |
| 537 | goto out; |
| 538 | if (status != NFS_OK) |
| 539 | goto out_default; |
| 540 | error = decode_diropok(xdr, result); |
| 541 | out: |
| 542 | return error; |
| 543 | out_default: |
| 544 | return nfs_stat_to_errno(status); |
| 545 | } |
| 546 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 547 | |
| 548 | /* |
Chuck Lever | 2d70f53 | 2010-12-14 14:54:40 +0000 | [diff] [blame] | 549 | * NFSv2 XDR encode functions |
| 550 | * |
| 551 | * NFSv2 argument types are defined in section 2.2 of RFC 1094: |
| 552 | * "NFS: Network File System Protocol Specification". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 555 | static int nfs2_xdr_enc_fhandle(struct rpc_rqst *req, __be32 *p, |
| 556 | const struct nfs_fh *fh) |
| 557 | { |
| 558 | struct xdr_stream xdr; |
| 559 | |
| 560 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 561 | encode_fhandle(&xdr, fh); |
| 562 | return 0; |
| 563 | } |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 566 | * 2.2.3. sattrargs |
| 567 | * |
| 568 | * struct sattrargs { |
| 569 | * fhandle file; |
| 570 | * sattr attributes; |
| 571 | * }; |
| 572 | */ |
| 573 | static int nfs2_xdr_enc_sattrargs(struct rpc_rqst *req, __be32 *p, |
| 574 | const struct nfs_sattrargs *args) |
| 575 | { |
| 576 | struct xdr_stream xdr; |
| 577 | |
| 578 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 579 | encode_fhandle(&xdr, args->fh); |
| 580 | encode_sattr(&xdr, args->sattr); |
| 581 | return 0; |
| 582 | } |
| 583 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 584 | static int nfs2_xdr_enc_diropargs(struct rpc_rqst *req, __be32 *p, |
| 585 | const struct nfs_diropargs *args) |
| 586 | { |
| 587 | struct xdr_stream xdr; |
| 588 | |
| 589 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 590 | encode_diropargs(&xdr, args->fh, args->name, args->len); |
| 591 | return 0; |
| 592 | } |
| 593 | |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 594 | static int nfs2_xdr_enc_readlinkargs(struct rpc_rqst *req, __be32 *p, |
| 595 | const struct nfs_readlinkargs *args) |
| 596 | { |
| 597 | struct xdr_stream xdr; |
| 598 | |
| 599 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 600 | encode_fhandle(&xdr, args->fh); |
| 601 | prepare_reply_buffer(req, args->pages, args->pgbase, |
| 602 | args->pglen, NFS_readlinkres_sz); |
| 603 | return 0; |
| 604 | } |
| 605 | |
Trond Myklebust | 4fdc17b | 2007-07-14 15:39:57 -0400 | [diff] [blame] | 606 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 607 | * 2.2.7. readargs |
| 608 | * |
| 609 | * struct readargs { |
| 610 | * fhandle file; |
| 611 | * unsigned offset; |
| 612 | * unsigned count; |
| 613 | * unsigned totalcount; |
| 614 | * }; |
| 615 | */ |
| 616 | static void encode_readargs(struct xdr_stream *xdr, |
| 617 | const struct nfs_readargs *args) |
| 618 | { |
| 619 | u32 offset = args->offset; |
| 620 | u32 count = args->count; |
| 621 | __be32 *p; |
| 622 | |
| 623 | encode_fhandle(xdr, args->fh); |
| 624 | |
| 625 | p = xdr_reserve_space(xdr, 4 + 4 + 4); |
| 626 | *p++ = cpu_to_be32(offset); |
| 627 | *p++ = cpu_to_be32(count); |
| 628 | *p = cpu_to_be32(count); |
| 629 | } |
| 630 | |
| 631 | static int nfs2_xdr_enc_readargs(struct rpc_rqst *req, __be32 *p, |
| 632 | const struct nfs_readargs *args) |
| 633 | { |
| 634 | struct xdr_stream xdr; |
| 635 | |
| 636 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 637 | encode_readargs(&xdr, args); |
| 638 | prepare_reply_buffer(req, args->pages, args->pgbase, |
| 639 | args->count, NFS_readres_sz); |
| 640 | req->rq_rcv_buf.flags |= XDRBUF_READ; |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | * Decode READ reply |
| 646 | */ |
| 647 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 648 | nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | { |
| 650 | struct kvec *iov = req->rq_rcv_buf.head; |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 651 | size_t hdrlen; |
| 652 | u32 count, recvd; |
| 653 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | if ((status = ntohl(*p++))) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 656 | return nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | p = xdr_decode_fattr(p, res->fattr); |
| 658 | |
| 659 | count = ntohl(*p++); |
| 660 | res->eof = 0; |
| 661 | hdrlen = (u8 *) p - (u8 *) iov->iov_base; |
| 662 | if (iov->iov_len < hdrlen) { |
Chuck Lever | fe82a18 | 2007-09-11 18:01:10 -0400 | [diff] [blame] | 663 | dprintk("NFS: READ reply header overflowed:" |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 664 | "length %Zu > %Zu\n", hdrlen, iov->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return -errno_NFSERR_IO; |
| 666 | } else if (iov->iov_len != hdrlen) { |
| 667 | dprintk("NFS: READ header is short. iovec will be shifted.\n"); |
| 668 | xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen); |
| 669 | } |
| 670 | |
| 671 | recvd = req->rq_rcv_buf.len - hdrlen; |
| 672 | if (count > recvd) { |
Chuck Lever | fe82a18 | 2007-09-11 18:01:10 -0400 | [diff] [blame] | 673 | dprintk("NFS: server cheating in read reply: " |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 674 | "count %u > recvd %u\n", count, recvd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | count = recvd; |
| 676 | } |
| 677 | |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 678 | dprintk("RPC: readres OK count %u\n", count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | if (count < res->count) |
| 680 | res->count = count; |
| 681 | |
| 682 | return count; |
| 683 | } |
| 684 | |
| 685 | |
| 686 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 687 | * 2.2.9. writeargs |
| 688 | * |
| 689 | * struct writeargs { |
| 690 | * fhandle file; |
| 691 | * unsigned beginoffset; |
| 692 | * unsigned offset; |
| 693 | * unsigned totalcount; |
| 694 | * nfsdata data; |
| 695 | * }; |
| 696 | */ |
| 697 | static void encode_writeargs(struct xdr_stream *xdr, |
| 698 | const struct nfs_writeargs *args) |
| 699 | { |
| 700 | u32 offset = args->offset; |
| 701 | u32 count = args->count; |
| 702 | __be32 *p; |
| 703 | |
| 704 | encode_fhandle(xdr, args->fh); |
| 705 | |
| 706 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
| 707 | *p++ = cpu_to_be32(offset); |
| 708 | *p++ = cpu_to_be32(offset); |
| 709 | *p++ = cpu_to_be32(count); |
| 710 | |
| 711 | /* nfsdata */ |
| 712 | *p = cpu_to_be32(count); |
| 713 | xdr_write_pages(xdr, args->pages, args->pgbase, count); |
| 714 | } |
| 715 | |
| 716 | static int nfs2_xdr_enc_writeargs(struct rpc_rqst *req, __be32 *p, |
| 717 | const struct nfs_writeargs *args) |
| 718 | { |
| 719 | struct xdr_stream xdr; |
| 720 | |
| 721 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 722 | encode_writeargs(&xdr, args); |
| 723 | xdr.buf->flags |= XDRBUF_WRITE; |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 728 | * 2.2.10. createargs |
| 729 | * |
| 730 | * struct createargs { |
| 731 | * diropargs where; |
| 732 | * sattr attributes; |
| 733 | * }; |
| 734 | */ |
| 735 | static int nfs2_xdr_enc_createargs(struct rpc_rqst *req, __be32 *p, |
| 736 | const struct nfs_createargs *args) |
| 737 | { |
| 738 | struct xdr_stream xdr; |
| 739 | |
| 740 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 741 | encode_diropargs(&xdr, args->fh, args->name, args->len); |
| 742 | encode_sattr(&xdr, args->sattr); |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | static int nfs2_xdr_enc_removeargs(struct rpc_rqst *req, __be32 *p, |
| 747 | const struct nfs_removeargs *args) |
| 748 | { |
| 749 | struct xdr_stream xdr; |
| 750 | |
| 751 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 752 | encode_diropargs(&xdr, args->fh, args->name.name, args->name.len); |
| 753 | return 0; |
| 754 | } |
| 755 | |
| 756 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 757 | * 2.2.12. renameargs |
| 758 | * |
| 759 | * struct renameargs { |
| 760 | * diropargs from; |
| 761 | * diropargs to; |
| 762 | * }; |
| 763 | */ |
| 764 | static int nfs2_xdr_enc_renameargs(struct rpc_rqst *req, __be32 *p, |
| 765 | const struct nfs_renameargs *args) |
| 766 | { |
| 767 | const struct qstr *old = args->old_name; |
| 768 | const struct qstr *new = args->new_name; |
| 769 | struct xdr_stream xdr; |
| 770 | |
| 771 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 772 | encode_diropargs(&xdr, args->old_dir, old->name, old->len); |
| 773 | encode_diropargs(&xdr, args->new_dir, new->name, new->len); |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 778 | * 2.2.13. linkargs |
| 779 | * |
| 780 | * struct linkargs { |
| 781 | * fhandle from; |
| 782 | * diropargs to; |
| 783 | * }; |
| 784 | */ |
| 785 | static int nfs2_xdr_enc_linkargs(struct rpc_rqst *req, __be32 *p, |
| 786 | const struct nfs_linkargs *args) |
| 787 | { |
| 788 | struct xdr_stream xdr; |
| 789 | |
| 790 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 791 | encode_fhandle(&xdr, args->fromfh); |
| 792 | encode_diropargs(&xdr, args->tofh, args->toname, args->tolen); |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 797 | * 2.2.14. symlinkargs |
| 798 | * |
| 799 | * struct symlinkargs { |
| 800 | * diropargs from; |
| 801 | * path to; |
| 802 | * sattr attributes; |
| 803 | * }; |
| 804 | */ |
| 805 | static int nfs2_xdr_enc_symlinkargs(struct rpc_rqst *req, __be32 *p, |
| 806 | const struct nfs_symlinkargs *args) |
| 807 | { |
| 808 | struct xdr_stream xdr; |
| 809 | |
| 810 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 811 | encode_diropargs(&xdr, args->fromfh, args->fromname, args->fromlen); |
| 812 | encode_path(&xdr, args->pages, args->pathlen); |
| 813 | encode_sattr(&xdr, args->sattr); |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | /* |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 818 | * 2.2.17. readdirargs |
| 819 | * |
| 820 | * struct readdirargs { |
| 821 | * fhandle dir; |
| 822 | * nfscookie cookie; |
| 823 | * unsigned count; |
| 824 | * }; |
| 825 | */ |
| 826 | static void encode_readdirargs(struct xdr_stream *xdr, |
| 827 | const struct nfs_readdirargs *args) |
| 828 | { |
| 829 | __be32 *p; |
| 830 | |
| 831 | encode_fhandle(xdr, args->fh); |
| 832 | |
| 833 | p = xdr_reserve_space(xdr, 4 + 4); |
| 834 | *p++ = cpu_to_be32(args->cookie); |
| 835 | *p = cpu_to_be32(args->count); |
| 836 | } |
| 837 | |
| 838 | static int nfs2_xdr_enc_readdirargs(struct rpc_rqst *req, __be32 *p, |
| 839 | const struct nfs_readdirargs *args) |
| 840 | { |
| 841 | struct xdr_stream xdr; |
| 842 | |
| 843 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 844 | encode_readdirargs(&xdr, args); |
| 845 | prepare_reply_buffer(req, args->pages, 0, |
| 846 | args->count, NFS_readdirres_sz); |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | * Decode the result of a readdir call. |
| 852 | * We're not really decoding anymore, we just leave the buffer untouched |
| 853 | * and only check that it is syntactically correct. |
| 854 | * The real decoding happens in nfs_decode_entry below, called directly |
| 855 | * from nfs_readdir for each entry. |
| 856 | */ |
| 857 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 858 | nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
| 860 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; |
| 861 | struct kvec *iov = rcvbuf->head; |
| 862 | struct page **page; |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 863 | size_t hdrlen; |
| 864 | unsigned int pglen, recvd; |
Trond Myklebust | ac39612 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 865 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | if ((status = ntohl(*p++))) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 868 | return nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | hdrlen = (u8 *) p - (u8 *) iov->iov_base; |
| 871 | if (iov->iov_len < hdrlen) { |
Chuck Lever | fe82a18 | 2007-09-11 18:01:10 -0400 | [diff] [blame] | 872 | dprintk("NFS: READDIR reply header overflowed:" |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 873 | "length %Zu > %Zu\n", hdrlen, iov->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | return -errno_NFSERR_IO; |
| 875 | } else if (iov->iov_len != hdrlen) { |
| 876 | dprintk("NFS: READDIR header is short. iovec will be shifted.\n"); |
| 877 | xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen); |
| 878 | } |
| 879 | |
| 880 | pglen = rcvbuf->page_len; |
| 881 | recvd = rcvbuf->len - hdrlen; |
| 882 | if (pglen > recvd) |
| 883 | pglen = recvd; |
| 884 | page = rcvbuf->pages; |
Trond Myklebust | ac39612 | 2010-11-15 20:26:22 -0500 | [diff] [blame] | 885 | return pglen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | } |
| 887 | |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 888 | __be32 * |
Bryan Schumaker | 82f2e54 | 2010-10-21 16:33:18 -0400 | [diff] [blame] | 889 | nfs_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, struct nfs_server *server, int plus) |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 890 | { |
| 891 | __be32 *p; |
| 892 | p = xdr_inline_decode(xdr, 4); |
| 893 | if (unlikely(!p)) |
| 894 | goto out_overflow; |
| 895 | if (!ntohl(*p++)) { |
| 896 | p = xdr_inline_decode(xdr, 4); |
| 897 | if (unlikely(!p)) |
| 898 | goto out_overflow; |
| 899 | if (!ntohl(*p++)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | return ERR_PTR(-EAGAIN); |
| 901 | entry->eof = 1; |
| 902 | return ERR_PTR(-EBADCOOKIE); |
| 903 | } |
| 904 | |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 905 | p = xdr_inline_decode(xdr, 8); |
| 906 | if (unlikely(!p)) |
| 907 | goto out_overflow; |
| 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | entry->ino = ntohl(*p++); |
| 910 | entry->len = ntohl(*p++); |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 911 | |
| 912 | p = xdr_inline_decode(xdr, entry->len + 4); |
| 913 | if (unlikely(!p)) |
| 914 | goto out_overflow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | entry->name = (const char *) p; |
| 916 | p += XDR_QUADLEN(entry->len); |
| 917 | entry->prev_cookie = entry->cookie; |
| 918 | entry->cookie = ntohl(*p++); |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 919 | |
Trond Myklebust | 0b26a0b | 2010-11-20 14:26:44 -0500 | [diff] [blame] | 920 | entry->d_type = DT_UNKNOWN; |
| 921 | |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 922 | p = xdr_inline_peek(xdr, 8); |
| 923 | if (p != NULL) |
| 924 | entry->eof = !p[0] && p[1]; |
| 925 | else |
| 926 | entry->eof = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
| 928 | return p; |
Bryan Schumaker | babddc7 | 2010-10-20 15:44:29 -0400 | [diff] [blame] | 929 | |
| 930 | out_overflow: |
| 931 | print_overflow_msg(__func__, xdr); |
Trond Myklebust | 463a376 | 2010-11-20 12:22:20 -0500 | [diff] [blame] | 932 | return ERR_PTR(-EAGAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } |
| 934 | |
| 935 | /* |
| 936 | * NFS XDR decode functions |
| 937 | */ |
| 938 | /* |
| 939 | * Decode simple status reply |
| 940 | */ |
| 941 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 942 | nfs_xdr_stat(struct rpc_rqst *req, __be32 *p, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { |
| 944 | int status; |
| 945 | |
| 946 | if ((status = ntohl(*p++)) != 0) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 947 | status = nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | return status; |
| 949 | } |
| 950 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 951 | static int nfs2_xdr_dec_stat(struct rpc_rqst *req, __be32 *p, |
| 952 | void *__unused) |
| 953 | { |
| 954 | struct xdr_stream xdr; |
| 955 | enum nfs_stat status; |
| 956 | int error; |
| 957 | |
| 958 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 959 | error = decode_stat(&xdr, &status); |
| 960 | if (unlikely(error)) |
| 961 | goto out; |
| 962 | if (status != NFS_OK) |
| 963 | goto out_default; |
| 964 | out: |
| 965 | return error; |
| 966 | out_default: |
| 967 | return nfs_stat_to_errno(status); |
| 968 | } |
| 969 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | /* |
| 971 | * Decode attrstat reply |
| 972 | * GETATTR, SETATTR, WRITE |
| 973 | */ |
| 974 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 975 | nfs_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | { |
| 977 | int status; |
| 978 | |
| 979 | if ((status = ntohl(*p++))) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 980 | return nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | xdr_decode_fattr(p, fattr); |
| 982 | return 0; |
| 983 | } |
| 984 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 985 | static int nfs2_xdr_dec_attrstat(struct rpc_rqst *req, __be32 *p, |
| 986 | struct nfs_fattr *result) |
| 987 | { |
| 988 | struct xdr_stream xdr; |
| 989 | |
| 990 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 991 | return decode_attrstat(&xdr, result); |
| 992 | } |
| 993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | /* |
| 995 | * Decode diropres reply |
| 996 | * LOOKUP, CREATE, MKDIR |
| 997 | */ |
| 998 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 999 | nfs_xdr_diropres(struct rpc_rqst *req, __be32 *p, struct nfs_diropok *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | { |
| 1001 | int status; |
| 1002 | |
| 1003 | if ((status = ntohl(*p++))) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1004 | return nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | p = xdr_decode_fhandle(p, res->fh); |
| 1006 | xdr_decode_fattr(p, res->fattr); |
| 1007 | return 0; |
| 1008 | } |
| 1009 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 1010 | static int nfs2_xdr_dec_diropres(struct rpc_rqst *req, __be32 *p, |
| 1011 | struct nfs_diropok *result) |
| 1012 | { |
| 1013 | struct xdr_stream xdr; |
| 1014 | |
| 1015 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 1016 | return decode_diropres(&xdr, result); |
| 1017 | } |
| 1018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | * Decode READLINK reply |
| 1021 | */ |
| 1022 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 1023 | nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | { |
| 1025 | struct xdr_buf *rcvbuf = &req->rq_rcv_buf; |
| 1026 | struct kvec *iov = rcvbuf->head; |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 1027 | size_t hdrlen; |
| 1028 | u32 len, recvd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | int status; |
| 1030 | |
| 1031 | if ((status = ntohl(*p++))) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1032 | return nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | /* Convert length of symlink */ |
| 1034 | len = ntohl(*p++); |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 1035 | if (len >= rcvbuf->page_len) { |
Chuck Lever | fe82a18 | 2007-09-11 18:01:10 -0400 | [diff] [blame] | 1036 | dprintk("nfs: server returned giant symlink!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | return -ENAMETOOLONG; |
| 1038 | } |
| 1039 | hdrlen = (u8 *) p - (u8 *) iov->iov_base; |
| 1040 | if (iov->iov_len < hdrlen) { |
Chuck Lever | fe82a18 | 2007-09-11 18:01:10 -0400 | [diff] [blame] | 1041 | dprintk("NFS: READLINK reply header overflowed:" |
Chuck Lever | 6232dbb | 2007-10-26 13:31:52 -0400 | [diff] [blame] | 1042 | "length %Zu > %Zu\n", hdrlen, iov->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | return -errno_NFSERR_IO; |
| 1044 | } else if (iov->iov_len != hdrlen) { |
| 1045 | dprintk("NFS: READLINK header is short. iovec will be shifted.\n"); |
| 1046 | xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen); |
| 1047 | } |
| 1048 | recvd = req->rq_rcv_buf.len - hdrlen; |
| 1049 | if (recvd < len) { |
Chuck Lever | fe82a18 | 2007-09-11 18:01:10 -0400 | [diff] [blame] | 1050 | dprintk("NFS: server cheating in readlink reply: " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | "count %u > recvd %u\n", len, recvd); |
| 1052 | return -EIO; |
| 1053 | } |
| 1054 | |
Chuck Lever | b4687da | 2010-09-21 16:55:48 -0400 | [diff] [blame] | 1055 | xdr_terminate_string(rcvbuf, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | return 0; |
| 1057 | } |
| 1058 | |
| 1059 | /* |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 1060 | * 2.2.6. readlinkres |
| 1061 | * |
| 1062 | * union readlinkres switch (stat status) { |
| 1063 | * case NFS_OK: |
| 1064 | * path data; |
| 1065 | * default: |
| 1066 | * void; |
| 1067 | * }; |
| 1068 | */ |
| 1069 | static int nfs2_xdr_dec_readlinkres(struct rpc_rqst *req, __be32 *p, |
| 1070 | void *__unused) |
| 1071 | { |
| 1072 | struct xdr_stream xdr; |
| 1073 | enum nfs_stat status; |
| 1074 | int error; |
| 1075 | |
| 1076 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 1077 | error = decode_stat(&xdr, &status); |
| 1078 | if (unlikely(error)) |
| 1079 | goto out; |
| 1080 | if (status != NFS_OK) |
| 1081 | goto out_default; |
| 1082 | error = decode_path(&xdr); |
| 1083 | out: |
| 1084 | return error; |
| 1085 | out_default: |
| 1086 | return nfs_stat_to_errno(status); |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * 2.2.7. readres |
| 1091 | * |
| 1092 | * union readres switch (stat status) { |
| 1093 | * case NFS_OK: |
| 1094 | * fattr attributes; |
| 1095 | * nfsdata data; |
| 1096 | * default: |
| 1097 | * void; |
| 1098 | * }; |
| 1099 | */ |
| 1100 | static int nfs2_xdr_dec_readres(struct rpc_rqst *req, __be32 *p, |
| 1101 | struct nfs_readres *result) |
| 1102 | { |
| 1103 | struct xdr_stream xdr; |
| 1104 | enum nfs_stat status; |
| 1105 | int error; |
| 1106 | |
| 1107 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 1108 | error = decode_stat(&xdr, &status); |
| 1109 | if (unlikely(error)) |
| 1110 | goto out; |
| 1111 | if (status != NFS_OK) |
| 1112 | goto out_default; |
| 1113 | error = decode_fattr(&xdr, result->fattr); |
| 1114 | if (unlikely(error)) |
| 1115 | goto out; |
| 1116 | error = decode_nfsdata(&xdr, result); |
| 1117 | out: |
| 1118 | return error; |
| 1119 | out_default: |
| 1120 | return nfs_stat_to_errno(status); |
| 1121 | } |
| 1122 | |
| 1123 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | * Decode WRITE reply |
| 1125 | */ |
| 1126 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 1127 | nfs_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | { |
| 1129 | res->verf->committed = NFS_FILE_SYNC; |
| 1130 | return nfs_xdr_attrstat(req, p, res->fattr); |
| 1131 | } |
| 1132 | |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 1133 | static int nfs2_xdr_dec_writeres(struct rpc_rqst *req, __be32 *p, |
| 1134 | struct nfs_writeres *result) |
| 1135 | { |
| 1136 | struct xdr_stream xdr; |
| 1137 | |
| 1138 | /* All NFSv2 writes are "file sync" writes */ |
| 1139 | result->verf->committed = NFS_FILE_SYNC; |
| 1140 | |
| 1141 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 1142 | return decode_attrstat(&xdr, result->fattr); |
| 1143 | } |
| 1144 | |
| 1145 | /** |
| 1146 | * nfs2_decode_dirent - Decode a single NFSv2 directory entry stored in |
| 1147 | * the local page cache. |
| 1148 | * @xdr: XDR stream where entry resides |
| 1149 | * @entry: buffer to fill in with entry data |
| 1150 | * @server: nfs_server data for this directory |
| 1151 | * @plus: boolean indicating whether this should be a readdirplus entry |
| 1152 | * |
| 1153 | * Returns the position of the next item in the buffer, or an ERR_PTR. |
| 1154 | * |
| 1155 | * This function is not invoked during READDIR reply decoding, but |
| 1156 | * rather whenever an application invokes the getdents(2) system call |
| 1157 | * on a directory already in our cache. |
| 1158 | * |
| 1159 | * 2.2.17. entry |
| 1160 | * |
| 1161 | * struct entry { |
| 1162 | * unsigned fileid; |
| 1163 | * filename name; |
| 1164 | * nfscookie cookie; |
| 1165 | * entry *nextentry; |
| 1166 | * }; |
| 1167 | */ |
| 1168 | __be32 *nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, |
| 1169 | struct nfs_server *server, int plus) |
| 1170 | { |
| 1171 | __be32 *p; |
| 1172 | int error; |
| 1173 | |
| 1174 | p = xdr_inline_decode(xdr, 4); |
| 1175 | if (unlikely(p == NULL)) |
| 1176 | goto out_overflow; |
| 1177 | if (*p++ == xdr_zero) { |
| 1178 | p = xdr_inline_decode(xdr, 4); |
| 1179 | if (unlikely(p == NULL)) |
| 1180 | goto out_overflow; |
| 1181 | if (*p++ == xdr_zero) |
| 1182 | return ERR_PTR(-EAGAIN); |
| 1183 | entry->eof = 1; |
| 1184 | return ERR_PTR(-EBADCOOKIE); |
| 1185 | } |
| 1186 | |
| 1187 | p = xdr_inline_decode(xdr, 4); |
| 1188 | if (unlikely(p == NULL)) |
| 1189 | goto out_overflow; |
| 1190 | entry->ino = be32_to_cpup(p); |
| 1191 | |
| 1192 | error = decode_filename_inline(xdr, &entry->name, &entry->len); |
| 1193 | if (unlikely(error)) |
| 1194 | return ERR_PTR(error); |
| 1195 | |
| 1196 | /* |
| 1197 | * The type (size and byte order) of nfscookie isn't defined in |
| 1198 | * RFC 1094. This implementation assumes that it's an XDR uint32. |
| 1199 | */ |
| 1200 | entry->prev_cookie = entry->cookie; |
| 1201 | p = xdr_inline_decode(xdr, 4); |
| 1202 | if (unlikely(p == NULL)) |
| 1203 | goto out_overflow; |
| 1204 | entry->cookie = be32_to_cpup(p); |
| 1205 | |
| 1206 | entry->d_type = DT_UNKNOWN; |
| 1207 | |
| 1208 | /* Peek at the next entry to see if we're at EOD */ |
| 1209 | p = xdr_inline_peek(xdr, 4 + 4); |
| 1210 | entry->eof = 0; |
| 1211 | if (p != NULL) |
| 1212 | entry->eof = (p[0] == xdr_zero) && (p[1] != xdr_zero); |
| 1213 | return p; |
| 1214 | |
| 1215 | out_overflow: |
| 1216 | print_overflow_msg(__func__, xdr); |
| 1217 | return ERR_PTR(-EAGAIN); |
| 1218 | } |
| 1219 | |
| 1220 | /* |
| 1221 | * 2.2.17. readdirres |
| 1222 | * |
| 1223 | * union readdirres switch (stat status) { |
| 1224 | * case NFS_OK: |
| 1225 | * struct { |
| 1226 | * entry *entries; |
| 1227 | * bool eof; |
| 1228 | * } readdirok; |
| 1229 | * default: |
| 1230 | * void; |
| 1231 | * }; |
| 1232 | * |
| 1233 | * Read the directory contents into the page cache, but don't |
| 1234 | * touch them. The actual decoding is done by nfs2_decode_dirent() |
| 1235 | * during subsequent nfs_readdir() calls. |
| 1236 | */ |
| 1237 | static int decode_readdirok(struct xdr_stream *xdr) |
| 1238 | { |
| 1239 | u32 recvd, pglen; |
| 1240 | size_t hdrlen; |
| 1241 | |
| 1242 | pglen = xdr->buf->page_len; |
| 1243 | hdrlen = (u8 *)xdr->p - (u8 *)xdr->iov->iov_base; |
| 1244 | recvd = xdr->buf->len - hdrlen; |
| 1245 | if (unlikely(pglen > recvd)) |
| 1246 | goto out_cheating; |
| 1247 | out: |
| 1248 | xdr_read_pages(xdr, pglen); |
| 1249 | return pglen; |
| 1250 | out_cheating: |
| 1251 | dprintk("NFS: server cheating in readdir result: " |
| 1252 | "pglen %u > recvd %u\n", pglen, recvd); |
| 1253 | pglen = recvd; |
| 1254 | goto out; |
| 1255 | } |
| 1256 | |
| 1257 | static int nfs2_xdr_dec_readdirres(struct rpc_rqst *req, __be32 *p, |
| 1258 | void *__unused) |
| 1259 | { |
| 1260 | struct xdr_stream xdr; |
| 1261 | enum nfs_stat status; |
| 1262 | int error; |
| 1263 | |
| 1264 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 1265 | error = decode_stat(&xdr, &status); |
| 1266 | if (unlikely(error)) |
| 1267 | goto out; |
| 1268 | if (status != NFS_OK) |
| 1269 | goto out_default; |
| 1270 | error = decode_readdirok(&xdr); |
| 1271 | out: |
| 1272 | return error; |
| 1273 | out_default: |
| 1274 | return nfs_stat_to_errno(status); |
| 1275 | } |
| 1276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | /* |
| 1278 | * Decode STATFS reply |
| 1279 | */ |
| 1280 | static int |
Al Viro | 9d787a7 | 2006-10-19 23:28:47 -0700 | [diff] [blame] | 1281 | nfs_xdr_statfsres(struct rpc_rqst *req, __be32 *p, struct nfs2_fsstat *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | { |
| 1283 | int status; |
| 1284 | |
| 1285 | if ((status = ntohl(*p++))) |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1286 | return nfs_stat_to_errno(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | |
| 1288 | res->tsize = ntohl(*p++); |
| 1289 | res->bsize = ntohl(*p++); |
| 1290 | res->blocks = ntohl(*p++); |
| 1291 | res->bfree = ntohl(*p++); |
| 1292 | res->bavail = ntohl(*p++); |
| 1293 | return 0; |
| 1294 | } |
| 1295 | |
| 1296 | /* |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 1297 | * 2.2.18. statfsres |
| 1298 | * |
| 1299 | * union statfsres (stat status) { |
| 1300 | * case NFS_OK: |
| 1301 | * struct { |
| 1302 | * unsigned tsize; |
| 1303 | * unsigned bsize; |
| 1304 | * unsigned blocks; |
| 1305 | * unsigned bfree; |
| 1306 | * unsigned bavail; |
| 1307 | * } info; |
| 1308 | * default: |
| 1309 | * void; |
| 1310 | * }; |
| 1311 | */ |
| 1312 | static int decode_info(struct xdr_stream *xdr, struct nfs2_fsstat *result) |
| 1313 | { |
| 1314 | __be32 *p; |
| 1315 | |
| 1316 | p = xdr_inline_decode(xdr, NFS_info_sz << 2); |
| 1317 | if (unlikely(p == NULL)) |
| 1318 | goto out_overflow; |
| 1319 | result->tsize = be32_to_cpup(p++); |
| 1320 | result->bsize = be32_to_cpup(p++); |
| 1321 | result->blocks = be32_to_cpup(p++); |
| 1322 | result->bfree = be32_to_cpup(p++); |
| 1323 | result->bavail = be32_to_cpup(p); |
| 1324 | return 0; |
| 1325 | out_overflow: |
| 1326 | print_overflow_msg(__func__, xdr); |
| 1327 | return -EIO; |
| 1328 | } |
| 1329 | |
| 1330 | static int nfs2_xdr_dec_statfsres(struct rpc_rqst *req, __be32 *p, |
| 1331 | struct nfs2_fsstat *result) |
| 1332 | { |
| 1333 | struct xdr_stream xdr; |
| 1334 | enum nfs_stat status; |
| 1335 | int error; |
| 1336 | |
| 1337 | xdr_init_decode(&xdr, &req->rq_rcv_buf, p); |
| 1338 | error = decode_stat(&xdr, &status); |
| 1339 | if (unlikely(error)) |
| 1340 | goto out; |
| 1341 | if (status != NFS_OK) |
| 1342 | goto out_default; |
| 1343 | error = decode_info(&xdr, result); |
| 1344 | out: |
| 1345 | return error; |
| 1346 | out_default: |
| 1347 | return nfs_stat_to_errno(status); |
| 1348 | } |
| 1349 | |
| 1350 | |
| 1351 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | * We need to translate between nfs status return values and |
| 1353 | * the local errno values which may not be the same. |
| 1354 | */ |
Chuck Lever | 8582849 | 2010-12-14 14:55:00 +0000 | [diff] [blame] | 1355 | static const struct { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | int stat; |
| 1357 | int errno; |
| 1358 | } nfs_errtbl[] = { |
| 1359 | { NFS_OK, 0 }, |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1360 | { NFSERR_PERM, -EPERM }, |
| 1361 | { NFSERR_NOENT, -ENOENT }, |
| 1362 | { NFSERR_IO, -errno_NFSERR_IO}, |
| 1363 | { NFSERR_NXIO, -ENXIO }, |
| 1364 | /* { NFSERR_EAGAIN, -EAGAIN }, */ |
| 1365 | { NFSERR_ACCES, -EACCES }, |
| 1366 | { NFSERR_EXIST, -EEXIST }, |
| 1367 | { NFSERR_XDEV, -EXDEV }, |
| 1368 | { NFSERR_NODEV, -ENODEV }, |
| 1369 | { NFSERR_NOTDIR, -ENOTDIR }, |
| 1370 | { NFSERR_ISDIR, -EISDIR }, |
| 1371 | { NFSERR_INVAL, -EINVAL }, |
| 1372 | { NFSERR_FBIG, -EFBIG }, |
| 1373 | { NFSERR_NOSPC, -ENOSPC }, |
| 1374 | { NFSERR_ROFS, -EROFS }, |
| 1375 | { NFSERR_MLINK, -EMLINK }, |
| 1376 | { NFSERR_NAMETOOLONG, -ENAMETOOLONG }, |
| 1377 | { NFSERR_NOTEMPTY, -ENOTEMPTY }, |
| 1378 | { NFSERR_DQUOT, -EDQUOT }, |
| 1379 | { NFSERR_STALE, -ESTALE }, |
| 1380 | { NFSERR_REMOTE, -EREMOTE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | #ifdef EWFLUSH |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1382 | { NFSERR_WFLUSH, -EWFLUSH }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | #endif |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1384 | { NFSERR_BADHANDLE, -EBADHANDLE }, |
| 1385 | { NFSERR_NOT_SYNC, -ENOTSYNC }, |
| 1386 | { NFSERR_BAD_COOKIE, -EBADCOOKIE }, |
| 1387 | { NFSERR_NOTSUPP, -ENOTSUPP }, |
| 1388 | { NFSERR_TOOSMALL, -ETOOSMALL }, |
Trond Myklebust | fdcb457 | 2010-02-08 09:32:40 -0500 | [diff] [blame] | 1389 | { NFSERR_SERVERFAULT, -EREMOTEIO }, |
Benny Halevy | 856dff3 | 2008-03-31 17:39:06 +0300 | [diff] [blame] | 1390 | { NFSERR_BADTYPE, -EBADTYPE }, |
| 1391 | { NFSERR_JUKEBOX, -EJUKEBOX }, |
| 1392 | { -1, -EIO } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | }; |
| 1394 | |
Chuck Lever | 8582849 | 2010-12-14 14:55:00 +0000 | [diff] [blame] | 1395 | /** |
| 1396 | * nfs_stat_to_errno - convert an NFS status code to a local errno |
| 1397 | * @status: NFS status code to convert |
| 1398 | * |
| 1399 | * Returns a local errno value, or -EIO if the NFS status code is |
| 1400 | * not recognized. This function is used jointly by NFSv2 and NFSv3. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | */ |
Chuck Lever | 8582849 | 2010-12-14 14:55:00 +0000 | [diff] [blame] | 1402 | int nfs_stat_to_errno(enum nfs_stat status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | { |
| 1404 | int i; |
| 1405 | |
| 1406 | for (i = 0; nfs_errtbl[i].stat != -1; i++) { |
Chuck Lever | 8582849 | 2010-12-14 14:55:00 +0000 | [diff] [blame] | 1407 | if (nfs_errtbl[i].stat == (int)status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | return nfs_errtbl[i].errno; |
| 1409 | } |
Chuck Lever | 8582849 | 2010-12-14 14:55:00 +0000 | [diff] [blame] | 1410 | dprintk("NFS: Unrecognized nfs status value: %u\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | return nfs_errtbl[i].errno; |
| 1412 | } |
| 1413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | #define PROC(proc, argtype, restype, timer) \ |
| 1415 | [NFSPROC_##proc] = { \ |
| 1416 | .p_proc = NFSPROC_##proc, \ |
Chuck Lever | 25a0866 | 2010-12-14 14:54:30 +0000 | [diff] [blame] | 1417 | .p_encode = (kxdrproc_t)nfs2_xdr_enc_##argtype, \ |
Chuck Lever | f796f8b | 2010-12-14 14:55:10 +0000 | [diff] [blame^] | 1418 | .p_decode = (kxdrproc_t)nfs2_xdr_dec_##restype, \ |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 1419 | .p_arglen = NFS_##argtype##_sz, \ |
| 1420 | .p_replen = NFS_##restype##_sz, \ |
Chuck Lever | cc0175c | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 1421 | .p_timer = timer, \ |
| 1422 | .p_statidx = NFSPROC_##proc, \ |
| 1423 | .p_name = #proc, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | } |
| 1425 | struct rpc_procinfo nfs_procedures[] = { |
| 1426 | PROC(GETATTR, fhandle, attrstat, 1), |
| 1427 | PROC(SETATTR, sattrargs, attrstat, 0), |
| 1428 | PROC(LOOKUP, diropargs, diropres, 2), |
| 1429 | PROC(READLINK, readlinkargs, readlinkres, 3), |
| 1430 | PROC(READ, readargs, readres, 3), |
| 1431 | PROC(WRITE, writeargs, writeres, 4), |
| 1432 | PROC(CREATE, createargs, diropres, 0), |
Trond Myklebust | 4fdc17b | 2007-07-14 15:39:57 -0400 | [diff] [blame] | 1433 | PROC(REMOVE, removeargs, stat, 0), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | PROC(RENAME, renameargs, stat, 0), |
| 1435 | PROC(LINK, linkargs, stat, 0), |
| 1436 | PROC(SYMLINK, symlinkargs, stat, 0), |
| 1437 | PROC(MKDIR, createargs, diropres, 0), |
| 1438 | PROC(RMDIR, diropargs, stat, 0), |
| 1439 | PROC(READDIR, readdirargs, readdirres, 3), |
| 1440 | PROC(STATFS, fhandle, statfsres, 0), |
| 1441 | }; |
| 1442 | |
| 1443 | struct rpc_version nfs_version2 = { |
| 1444 | .number = 2, |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 1445 | .nrprocs = ARRAY_SIZE(nfs_procedures), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | .procs = nfs_procedures |
| 1447 | }; |