Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (c) 2001 The Regents of the University of Michigan. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Kendrick Smith <kmsmith@umich.edu> |
| 6 | * Andy Adamson <andros@umich.edu> |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/sunrpc/clnt.h> |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 35 | #include <linux/sunrpc/svc_xprt.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 36 | #include <linux/slab.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 37 | #include "nfsd.h" |
| 38 | #include "state.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #define NFSDDBG_FACILITY NFSDDBG_PROC |
| 41 | |
Benny Halevy | 5423732 | 2011-10-19 19:12:58 -0700 | [diff] [blame] | 42 | static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define NFSPROC4_CB_NULL 0 |
| 45 | #define NFSPROC4_CB_COMPOUND 1 |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | /* Index of predefined Linux callback client operations */ |
| 48 | |
| 49 | enum { |
Benny Halevy | 4be36ca | 2009-09-10 12:25:46 +0300 | [diff] [blame] | 50 | NFSPROC4_CLNT_CB_NULL = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | NFSPROC4_CLNT_CB_RECALL, |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 52 | NFSPROC4_CLNT_CB_SEQUENCE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | }; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define NFS4_MAXTAGLEN 20 |
| 56 | |
| 57 | #define NFS4_enc_cb_null_sz 0 |
| 58 | #define NFS4_dec_cb_null_sz 0 |
| 59 | #define cb_compound_enc_hdr_sz 4 |
| 60 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 61 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
| 62 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ |
| 63 | 1 /* no referring calls list yet */) |
| 64 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define op_enc_sz 1 |
| 67 | #define op_dec_sz 2 |
| 68 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) |
Benny Halevy | 0ac68d1 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 69 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 71 | cb_sequence_enc_sz + \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | 1 + enc_stateid_sz + \ |
| 73 | enc_nfs4_fh_sz) |
| 74 | |
| 75 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 76 | cb_sequence_dec_sz + \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | op_dec_sz) |
| 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | struct nfs4_cb_compound_hdr { |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 80 | /* args */ |
| 81 | u32 ident; /* minorversion 0 only */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | u32 nops; |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 83 | __be32 *nops_p; |
Andy Adamson | ab52ae6 | 2009-06-16 04:20:53 +0300 | [diff] [blame] | 84 | u32 minorversion; |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 85 | /* res */ |
| 86 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | }; |
| 88 | |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 89 | /* |
| 90 | * Handle decode buffer overflows out-of-line. |
| 91 | */ |
| 92 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 94 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
| 95 | "Remaining buffer length is %tu words.\n", |
| 96 | func, xdr->end - xdr->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 99 | static __be32 *xdr_encode_empty_array(__be32 *p) |
| 100 | { |
| 101 | *p++ = xdr_zero; |
| 102 | return p; |
| 103 | } |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | /* |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 106 | * Encode/decode NFSv4 CB basic data types |
| 107 | * |
| 108 | * Basic NFSv4 callback data types are defined in section 15 of RFC |
| 109 | * 3530: "Network File System (NFS) version 4 Protocol" and section |
| 110 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version |
| 111 | * 1 Protocol" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | */ |
| 113 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 114 | /* |
| 115 | * nfs_cb_opnum4 |
| 116 | * |
| 117 | * enum nfs_cb_opnum4 { |
| 118 | * OP_CB_GETATTR = 3, |
| 119 | * ... |
| 120 | * }; |
| 121 | */ |
| 122 | enum nfs_cb_opnum4 { |
| 123 | OP_CB_GETATTR = 3, |
| 124 | OP_CB_RECALL = 4, |
| 125 | OP_CB_LAYOUTRECALL = 5, |
| 126 | OP_CB_NOTIFY = 6, |
| 127 | OP_CB_PUSH_DELEG = 7, |
| 128 | OP_CB_RECALL_ANY = 8, |
| 129 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, |
| 130 | OP_CB_RECALL_SLOT = 10, |
| 131 | OP_CB_SEQUENCE = 11, |
| 132 | OP_CB_WANTS_CANCELLED = 12, |
| 133 | OP_CB_NOTIFY_LOCK = 13, |
| 134 | OP_CB_NOTIFY_DEVICEID = 14, |
| 135 | OP_CB_ILLEGAL = 10044 |
| 136 | }; |
| 137 | |
| 138 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) |
Benny Halevy | 9303bbd | 2010-05-25 09:50:23 +0300 | [diff] [blame] | 139 | { |
| 140 | __be32 *p; |
| 141 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 142 | p = xdr_reserve_space(xdr, 4); |
| 143 | *p = cpu_to_be32(op); |
Benny Halevy | 9303bbd | 2010-05-25 09:50:23 +0300 | [diff] [blame] | 144 | } |
| 145 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 146 | /* |
| 147 | * nfs_fh4 |
| 148 | * |
| 149 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; |
| 150 | */ |
| 151 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) |
| 152 | { |
| 153 | u32 length = fh->fh_size; |
| 154 | __be32 *p; |
| 155 | |
| 156 | BUG_ON(length > NFS4_FHSIZE); |
| 157 | p = xdr_reserve_space(xdr, 4 + length); |
| 158 | xdr_encode_opaque(p, &fh->fh_base, length); |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * stateid4 |
| 163 | * |
| 164 | * struct stateid4 { |
| 165 | * uint32_t seqid; |
| 166 | * opaque other[12]; |
| 167 | * }; |
| 168 | */ |
| 169 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
| 170 | { |
| 171 | __be32 *p; |
| 172 | |
| 173 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
| 174 | *p++ = cpu_to_be32(sid->si_generation); |
| 175 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * sessionid4 |
| 180 | * |
| 181 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; |
| 182 | */ |
| 183 | static void encode_sessionid4(struct xdr_stream *xdr, |
| 184 | const struct nfsd4_session *session) |
| 185 | { |
| 186 | __be32 *p; |
| 187 | |
| 188 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
| 189 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, |
| 190 | NFS4_MAX_SESSIONID_LEN); |
| 191 | } |
| 192 | |
| 193 | /* |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 194 | * nfsstat4 |
| 195 | */ |
| 196 | static const struct { |
| 197 | int stat; |
| 198 | int errno; |
| 199 | } nfs_cb_errtbl[] = { |
| 200 | { NFS4_OK, 0 }, |
| 201 | { NFS4ERR_PERM, -EPERM }, |
| 202 | { NFS4ERR_NOENT, -ENOENT }, |
| 203 | { NFS4ERR_IO, -EIO }, |
| 204 | { NFS4ERR_NXIO, -ENXIO }, |
| 205 | { NFS4ERR_ACCESS, -EACCES }, |
| 206 | { NFS4ERR_EXIST, -EEXIST }, |
| 207 | { NFS4ERR_XDEV, -EXDEV }, |
| 208 | { NFS4ERR_NOTDIR, -ENOTDIR }, |
| 209 | { NFS4ERR_ISDIR, -EISDIR }, |
| 210 | { NFS4ERR_INVAL, -EINVAL }, |
| 211 | { NFS4ERR_FBIG, -EFBIG }, |
| 212 | { NFS4ERR_NOSPC, -ENOSPC }, |
| 213 | { NFS4ERR_ROFS, -EROFS }, |
| 214 | { NFS4ERR_MLINK, -EMLINK }, |
| 215 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, |
| 216 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, |
| 217 | { NFS4ERR_DQUOT, -EDQUOT }, |
| 218 | { NFS4ERR_STALE, -ESTALE }, |
| 219 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, |
| 220 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, |
| 221 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, |
| 222 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, |
| 223 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, |
| 224 | { NFS4ERR_BADTYPE, -EBADTYPE }, |
| 225 | { NFS4ERR_LOCKED, -EAGAIN }, |
| 226 | { NFS4ERR_RESOURCE, -EREMOTEIO }, |
| 227 | { NFS4ERR_SYMLINK, -ELOOP }, |
| 228 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, |
| 229 | { NFS4ERR_DEADLOCK, -EDEADLK }, |
| 230 | { -1, -EIO } |
| 231 | }; |
| 232 | |
| 233 | /* |
| 234 | * If we cannot translate the error, the recovery routines should |
| 235 | * handle it. |
| 236 | * |
| 237 | * Note: remaining NFSv4 error codes have values > 10000, so should |
| 238 | * not conflict with native Linux error codes. |
| 239 | */ |
| 240 | static int nfs_cb_stat_to_errno(int status) |
| 241 | { |
| 242 | int i; |
| 243 | |
| 244 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { |
| 245 | if (nfs_cb_errtbl[i].stat == status) |
| 246 | return nfs_cb_errtbl[i].errno; |
| 247 | } |
| 248 | |
| 249 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); |
| 250 | return -status; |
| 251 | } |
| 252 | |
| 253 | static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, |
| 254 | enum nfsstat4 *status) |
| 255 | { |
| 256 | __be32 *p; |
| 257 | u32 op; |
| 258 | |
| 259 | p = xdr_inline_decode(xdr, 4 + 4); |
| 260 | if (unlikely(p == NULL)) |
| 261 | goto out_overflow; |
| 262 | op = be32_to_cpup(p++); |
| 263 | if (unlikely(op != expected)) |
| 264 | goto out_unexpected; |
| 265 | *status = be32_to_cpup(p); |
| 266 | return 0; |
| 267 | out_overflow: |
| 268 | print_overflow_msg(__func__, xdr); |
| 269 | return -EIO; |
| 270 | out_unexpected: |
| 271 | dprintk("NFSD: Callback server returned operation %d but " |
| 272 | "we issued a request for %d\n", op, expected); |
| 273 | return -EIO; |
| 274 | } |
| 275 | |
| 276 | /* |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 277 | * CB_COMPOUND4args |
| 278 | * |
| 279 | * struct CB_COMPOUND4args { |
| 280 | * utf8str_cs tag; |
| 281 | * uint32_t minorversion; |
| 282 | * uint32_t callback_ident; |
| 283 | * nfs_cb_argop4 argarray<>; |
| 284 | * }; |
| 285 | */ |
| 286 | static void encode_cb_compound4args(struct xdr_stream *xdr, |
| 287 | struct nfs4_cb_compound_hdr *hdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 289 | __be32 * p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 291 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
| 292 | p = xdr_encode_empty_array(p); /* empty tag */ |
| 293 | *p++ = cpu_to_be32(hdr->minorversion); |
| 294 | *p++ = cpu_to_be32(hdr->ident); |
| 295 | |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 296 | hdr->nops_p = p; |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 297 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 300 | /* |
| 301 | * Update argarray element count |
| 302 | */ |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 303 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
| 304 | { |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 305 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
| 306 | *hdr->nops_p = cpu_to_be32(hdr->nops); |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 307 | } |
| 308 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 309 | /* |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 310 | * CB_COMPOUND4res |
| 311 | * |
| 312 | * struct CB_COMPOUND4res { |
| 313 | * nfsstat4 status; |
| 314 | * utf8str_cs tag; |
| 315 | * nfs_cb_resop4 resarray<>; |
| 316 | * }; |
| 317 | */ |
| 318 | static int decode_cb_compound4res(struct xdr_stream *xdr, |
| 319 | struct nfs4_cb_compound_hdr *hdr) |
| 320 | { |
| 321 | u32 length; |
| 322 | __be32 *p; |
| 323 | |
| 324 | p = xdr_inline_decode(xdr, 4 + 4); |
| 325 | if (unlikely(p == NULL)) |
| 326 | goto out_overflow; |
| 327 | hdr->status = be32_to_cpup(p++); |
| 328 | /* Ignore the tag */ |
| 329 | length = be32_to_cpup(p++); |
| 330 | p = xdr_inline_decode(xdr, length + 4); |
| 331 | if (unlikely(p == NULL)) |
| 332 | goto out_overflow; |
| 333 | hdr->nops = be32_to_cpup(p); |
| 334 | return 0; |
| 335 | out_overflow: |
| 336 | print_overflow_msg(__func__, xdr); |
| 337 | return -EIO; |
| 338 | } |
| 339 | |
| 340 | /* |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 341 | * CB_RECALL4args |
| 342 | * |
| 343 | * struct CB_RECALL4args { |
| 344 | * stateid4 stateid; |
| 345 | * bool truncate; |
| 346 | * nfs_fh4 fh; |
| 347 | * }; |
| 348 | */ |
| 349 | static void encode_cb_recall4args(struct xdr_stream *xdr, |
| 350 | const struct nfs4_delegation *dp, |
| 351 | struct nfs4_cb_compound_hdr *hdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 353 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 355 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); |
J. Bruce Fields | d5477a8 | 2011-09-08 12:07:44 -0400 | [diff] [blame] | 356 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 357 | |
| 358 | p = xdr_reserve_space(xdr, 4); |
| 359 | *p++ = xdr_zero; /* truncate */ |
| 360 | |
| 361 | encode_nfs_fh4(xdr, &dp->dl_fh); |
| 362 | |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 363 | hdr->nops++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } |
| 365 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 366 | /* |
| 367 | * CB_SEQUENCE4args |
| 368 | * |
| 369 | * struct CB_SEQUENCE4args { |
| 370 | * sessionid4 csa_sessionid; |
| 371 | * sequenceid4 csa_sequenceid; |
| 372 | * slotid4 csa_slotid; |
| 373 | * slotid4 csa_highest_slotid; |
| 374 | * bool csa_cachethis; |
| 375 | * referring_call_list4 csa_referring_call_lists<>; |
| 376 | * }; |
| 377 | */ |
| 378 | static void encode_cb_sequence4args(struct xdr_stream *xdr, |
| 379 | const struct nfsd4_callback *cb, |
| 380 | struct nfs4_cb_compound_hdr *hdr) |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 381 | { |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 382 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 383 | __be32 *p; |
| 384 | |
| 385 | if (hdr->minorversion == 0) |
| 386 | return; |
| 387 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 388 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
| 389 | encode_sessionid4(xdr, session); |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 390 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 391 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); |
| 392 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ |
| 393 | *p++ = xdr_zero; /* csa_slotid */ |
| 394 | *p++ = xdr_zero; /* csa_highest_slotid */ |
| 395 | *p++ = xdr_zero; /* csa_cachethis */ |
| 396 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ |
| 397 | |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 398 | hdr->nops++; |
| 399 | } |
| 400 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 401 | /* |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 402 | * CB_SEQUENCE4resok |
| 403 | * |
| 404 | * struct CB_SEQUENCE4resok { |
| 405 | * sessionid4 csr_sessionid; |
| 406 | * sequenceid4 csr_sequenceid; |
| 407 | * slotid4 csr_slotid; |
| 408 | * slotid4 csr_highest_slotid; |
| 409 | * slotid4 csr_target_highest_slotid; |
| 410 | * }; |
| 411 | * |
| 412 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { |
| 413 | * case NFS4_OK: |
| 414 | * CB_SEQUENCE4resok csr_resok4; |
| 415 | * default: |
| 416 | * void; |
| 417 | * }; |
| 418 | * |
| 419 | * Our current back channel implmentation supports a single backchannel |
| 420 | * with a single slot. |
| 421 | */ |
| 422 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, |
| 423 | struct nfsd4_callback *cb) |
| 424 | { |
| 425 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
| 426 | struct nfs4_sessionid id; |
| 427 | int status; |
| 428 | __be32 *p; |
| 429 | u32 dummy; |
| 430 | |
| 431 | status = -ESERVERFAULT; |
| 432 | |
| 433 | /* |
| 434 | * If the server returns different values for sessionID, slotID or |
| 435 | * sequence number, the server is looney tunes. |
| 436 | */ |
Benny Halevy | 2c9c8f3 | 2011-02-22 14:43:22 -0800 | [diff] [blame] | 437 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 438 | if (unlikely(p == NULL)) |
| 439 | goto out_overflow; |
| 440 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); |
| 441 | if (memcmp(id.data, session->se_sessionid.data, |
| 442 | NFS4_MAX_SESSIONID_LEN) != 0) { |
| 443 | dprintk("NFS: %s Invalid session id\n", __func__); |
| 444 | goto out; |
| 445 | } |
| 446 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); |
| 447 | |
| 448 | dummy = be32_to_cpup(p++); |
| 449 | if (dummy != session->se_cb_seq_nr) { |
| 450 | dprintk("NFS: %s Invalid sequence number\n", __func__); |
| 451 | goto out; |
| 452 | } |
| 453 | |
| 454 | dummy = be32_to_cpup(p++); |
| 455 | if (dummy != 0) { |
| 456 | dprintk("NFS: %s Invalid slotid\n", __func__); |
| 457 | goto out; |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * FIXME: process highest slotid and target highest slotid |
| 462 | */ |
| 463 | status = 0; |
| 464 | out: |
Benny Halevy | 5423732 | 2011-10-19 19:12:58 -0700 | [diff] [blame] | 465 | if (status) |
| 466 | nfsd4_mark_cb_fault(cb->cb_clp, status); |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 467 | return status; |
| 468 | out_overflow: |
| 469 | print_overflow_msg(__func__, xdr); |
| 470 | return -EIO; |
| 471 | } |
| 472 | |
| 473 | static int decode_cb_sequence4res(struct xdr_stream *xdr, |
| 474 | struct nfsd4_callback *cb) |
| 475 | { |
| 476 | enum nfsstat4 nfserr; |
| 477 | int status; |
| 478 | |
| 479 | if (cb->cb_minorversion == 0) |
| 480 | return 0; |
| 481 | |
| 482 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); |
| 483 | if (unlikely(status)) |
| 484 | goto out; |
| 485 | if (unlikely(nfserr != NFS4_OK)) |
| 486 | goto out_default; |
| 487 | status = decode_cb_sequence4resok(xdr, cb); |
| 488 | out: |
| 489 | return status; |
| 490 | out_default: |
Benny Halevy | 0af3f81 | 2011-01-13 11:25:31 +0200 | [diff] [blame] | 491 | return nfs_cb_stat_to_errno(nfserr); |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | /* |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 495 | * NFSv4.0 and NFSv4.1 XDR encode functions |
| 496 | * |
| 497 | * NFSv4.0 callback argument types are defined in section 15 of RFC |
| 498 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 |
| 499 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 |
| 500 | * Protocol". |
| 501 | */ |
| 502 | |
| 503 | /* |
| 504 | * NB: Without this zero space reservation, callbacks over krb5p fail |
| 505 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 506 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
| 507 | void *__unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | { |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 509 | xdr_reserve_space(xdr, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 512 | /* |
| 513 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation |
| 514 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 515 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
| 516 | const struct nfsd4_callback *cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | { |
Chuck Lever | a033db4 | 2010-12-14 14:57:22 +0000 | [diff] [blame] | 518 | const struct nfs4_delegation *args = cb->cb_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | struct nfs4_cb_compound_hdr hdr = { |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 520 | .ident = cb->cb_clp->cl_cb_ident, |
J. Bruce Fields | fb00392 | 2010-05-31 18:21:37 -0400 | [diff] [blame] | 521 | .minorversion = cb->cb_minorversion, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | }; |
| 523 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 524 | encode_cb_compound4args(xdr, &hdr); |
| 525 | encode_cb_sequence4args(xdr, cb, &hdr); |
| 526 | encode_cb_recall4args(xdr, args, &hdr); |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 527 | encode_cb_nops(&hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 531 | /* |
| 532 | * NFSv4.0 and NFSv4.1 XDR decode functions |
| 533 | * |
| 534 | * NFSv4.0 callback result types are defined in section 15 of RFC |
| 535 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 |
| 536 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 |
| 537 | * Protocol". |
| 538 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 540 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
| 541 | void *__unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | return 0; |
| 544 | } |
| 545 | |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 546 | /* |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 547 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 548 | */ |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 549 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
| 550 | struct xdr_stream *xdr, |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 551 | struct nfsd4_callback *cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | struct nfs4_cb_compound_hdr hdr; |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 554 | enum nfsstat4 nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | int status; |
| 556 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 557 | status = decode_cb_compound4res(xdr, &hdr); |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 558 | if (unlikely(status)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | goto out; |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 560 | |
| 561 | if (cb != NULL) { |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 562 | status = decode_cb_sequence4res(xdr, cb); |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 563 | if (unlikely(status)) |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 564 | goto out; |
| 565 | } |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 566 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 567 | status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr); |
Chuck Lever | 85a5648 | 2010-12-14 14:57:32 +0000 | [diff] [blame] | 568 | if (unlikely(status)) |
| 569 | goto out; |
| 570 | if (unlikely(nfserr != NFS4_OK)) |
Benny Halevy | 0af3f81 | 2011-01-13 11:25:31 +0200 | [diff] [blame] | 571 | status = nfs_cb_stat_to_errno(nfserr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | out: |
| 573 | return status; |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * RPC procedure tables |
| 578 | */ |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 579 | #define PROC(proc, call, argtype, restype) \ |
| 580 | [NFSPROC4_CLNT_##proc] = { \ |
| 581 | .p_proc = NFSPROC4_CB_##call, \ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 582 | .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 583 | .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \ |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 584 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
| 585 | .p_replen = NFS4_dec_##restype##_sz, \ |
| 586 | .p_statidx = NFSPROC4_CB_##call, \ |
| 587 | .p_name = #proc, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 590 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
| 591 | PROC(CB_NULL, NULL, cb_null, cb_null), |
| 592 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | }; |
| 594 | |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 595 | static struct rpc_version nfs_cb_version4 = { |
J. Bruce Fields | b7299f4 | 2010-05-14 17:57:35 -0400 | [diff] [blame] | 596 | /* |
| 597 | * Note on the callback rpc program version number: despite language in rfc |
| 598 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the |
| 599 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and |
| 600 | * in practice that appears to be what implementations use. The section |
| 601 | * 18.36.3 language is expected to be fixed in an erratum. |
| 602 | */ |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 603 | .number = 1, |
| 604 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
| 605 | .procs = nfs4_cb_procedures |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | }; |
| 607 | |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 608 | static struct rpc_version *nfs_cb_version[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | &nfs_cb_version4, |
| 610 | }; |
| 611 | |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 612 | static struct rpc_program cb_program; |
| 613 | |
| 614 | static struct rpc_stat cb_stats = { |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 615 | .program = &cb_program |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 616 | }; |
| 617 | |
| 618 | #define NFS4_CALLBACK 0x40000000 |
| 619 | static struct rpc_program cb_program = { |
Chuck Lever | 7d93bd71 | 2010-12-14 14:57:42 +0000 | [diff] [blame] | 620 | .name = "nfs4_cb", |
| 621 | .number = NFS4_CALLBACK, |
| 622 | .nrvers = ARRAY_SIZE(nfs_cb_version), |
| 623 | .version = nfs_cb_version, |
| 624 | .stats = &cb_stats, |
| 625 | .pipe_dir_name = "/nfsd4_cb", |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 626 | }; |
| 627 | |
J. Bruce Fields | 595947a | 2009-03-05 17:18:10 -0500 | [diff] [blame] | 628 | static int max_cb_time(void) |
| 629 | { |
J. Bruce Fields | cf07d2e | 2010-02-28 23:20:19 -0500 | [diff] [blame] | 630 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
J. Bruce Fields | 595947a | 2009-03-05 17:18:10 -0500 | [diff] [blame] | 631 | } |
| 632 | |
J. Bruce Fields | 2b47eec | 2007-07-27 18:06:50 -0400 | [diff] [blame] | 633 | |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 634 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
J. Bruce Fields | 2b47eec | 2007-07-27 18:06:50 -0400 | [diff] [blame] | 635 | { |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 636 | struct rpc_timeout timeparms = { |
J. Bruce Fields | 595947a | 2009-03-05 17:18:10 -0500 | [diff] [blame] | 637 | .to_initval = max_cb_time(), |
| 638 | .to_retries = 0, |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 639 | }; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 640 | struct rpc_create_args args = { |
Pavel Emelyanov | c653ce3 | 2010-09-29 16:04:45 +0400 | [diff] [blame] | 641 | .net = &init_net, |
J. Bruce Fields | 07263f1 | 2010-05-31 19:09:40 -0400 | [diff] [blame] | 642 | .address = (struct sockaddr *) &conn->cb_addr, |
| 643 | .addrsize = conn->cb_addrlen, |
Takuma Umeya | 6f3d772 | 2010-12-15 14:09:01 +0900 | [diff] [blame] | 644 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 645 | .timeout = &timeparms, |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 646 | .program = &cb_program, |
J. Bruce Fields | b7299f4 | 2010-05-14 17:57:35 -0400 | [diff] [blame] | 647 | .version = 0, |
Olga Kornievskaia | 61054b1 | 2008-12-23 16:19:00 -0500 | [diff] [blame] | 648 | .authflavor = clp->cl_flavor, |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 649 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 650 | }; |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 651 | struct rpc_clnt *client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
J. Bruce Fields | 5d18c1c | 2010-10-19 23:00:12 -0400 | [diff] [blame] | 653 | if (clp->cl_minorversion == 0) { |
| 654 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
| 655 | return -EINVAL; |
| 656 | args.client_name = clp->cl_principal; |
| 657 | args.prognumber = conn->cb_prog, |
| 658 | args.protocol = XPRT_TRANSPORT_TCP; |
| 659 | clp->cl_cb_ident = conn->cb_ident; |
| 660 | } else { |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 661 | if (!conn->cb_xprt) |
| 662 | return -EINVAL; |
| 663 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; |
| 664 | clp->cl_cb_session = ses; |
J. Bruce Fields | 07263f1 | 2010-05-31 19:09:40 -0400 | [diff] [blame] | 665 | args.bc_xprt = conn->cb_xprt; |
J. Bruce Fields | 8b5ce5c | 2010-10-19 17:31:50 -0400 | [diff] [blame] | 666 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
Alexandros Batsakis | 3ddc8bf | 2009-09-10 12:27:21 +0300 | [diff] [blame] | 667 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
| 668 | } |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 669 | /* Create RPC client */ |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 670 | client = rpc_create(&args); |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 671 | if (IS_ERR(client)) { |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 672 | dprintk("NFSD: couldn't create callback client: %ld\n", |
| 673 | PTR_ERR(client)); |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 674 | return PTR_ERR(client); |
| 675 | } |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 676 | clp->cl_cb_client = client; |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 677 | return 0; |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 678 | |
| 679 | } |
| 680 | |
J. Bruce Fields | ecdd03b | 2009-02-23 19:35:22 -0800 | [diff] [blame] | 681 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
| 682 | { |
| 683 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", |
| 684 | (int)clp->cl_name.len, clp->cl_name.data, reason); |
| 685 | } |
| 686 | |
J. Bruce Fields | 77a3569 | 2010-04-30 18:51:44 -0400 | [diff] [blame] | 687 | static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
| 688 | { |
| 689 | clp->cl_cb_state = NFSD4_CB_DOWN; |
| 690 | warn_no_callback_path(clp, reason); |
| 691 | } |
| 692 | |
Benny Halevy | 5423732 | 2011-10-19 19:12:58 -0700 | [diff] [blame] | 693 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
| 694 | { |
| 695 | clp->cl_cb_state = NFSD4_CB_FAULT; |
| 696 | warn_no_callback_path(clp, reason); |
| 697 | } |
| 698 | |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 699 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
| 700 | { |
J. Bruce Fields | cee277d | 2010-05-26 17:52:14 -0400 | [diff] [blame] | 701 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 702 | |
| 703 | if (task->tk_status) |
J. Bruce Fields | 77a3569 | 2010-04-30 18:51:44 -0400 | [diff] [blame] | 704 | nfsd4_mark_cb_down(clp, task->tk_status); |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 705 | else |
J. Bruce Fields | 77a3569 | 2010-04-30 18:51:44 -0400 | [diff] [blame] | 706 | clp->cl_cb_state = NFSD4_CB_UP; |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { |
J. Bruce Fields | cee277d | 2010-05-26 17:52:14 -0400 | [diff] [blame] | 710 | /* XXX: release method to ensure we set the cb channel down if |
| 711 | * necessary on early failure? */ |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 712 | .rpc_call_done = nfsd4_cb_probe_done, |
| 713 | }; |
| 714 | |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 715 | static struct rpc_cred *callback_cred; |
J. Bruce Fields | 3cef9ab | 2009-02-23 21:42:10 -0800 | [diff] [blame] | 716 | |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 717 | int set_callback_cred(void) |
| 718 | { |
J. Bruce Fields | 8d75da8 | 2010-03-03 16:13:29 -0500 | [diff] [blame] | 719 | if (callback_cred) |
| 720 | return 0; |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 721 | callback_cred = rpc_lookup_machine_cred(); |
| 722 | if (!callback_cred) |
| 723 | return -ENOMEM; |
| 724 | return 0; |
J. Bruce Fields | 3cef9ab | 2009-02-23 21:42:10 -0800 | [diff] [blame] | 725 | } |
| 726 | |
J. Bruce Fields | cee277d | 2010-05-26 17:52:14 -0400 | [diff] [blame] | 727 | static struct workqueue_struct *callback_wq; |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 728 | |
J. Bruce Fields | 229b2a0 | 2010-12-10 17:37:44 -0500 | [diff] [blame] | 729 | static void run_nfsd4_cb(struct nfsd4_callback *cb) |
| 730 | { |
| 731 | queue_work(callback_wq, &cb->cb_work); |
| 732 | } |
| 733 | |
J. Bruce Fields | 5a3c9d7 | 2010-10-19 17:56:52 -0400 | [diff] [blame] | 734 | static void do_probe_callback(struct nfs4_client *clp) |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 735 | { |
J. Bruce Fields | cee277d | 2010-05-26 17:52:14 -0400 | [diff] [blame] | 736 | struct nfsd4_callback *cb = &clp->cl_cb_null; |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 737 | |
J. Bruce Fields | fb00392 | 2010-05-31 18:21:37 -0400 | [diff] [blame] | 738 | cb->cb_op = NULL; |
| 739 | cb->cb_clp = clp; |
J. Bruce Fields | cee277d | 2010-05-26 17:52:14 -0400 | [diff] [blame] | 740 | |
| 741 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; |
| 742 | cb->cb_msg.rpc_argp = NULL; |
| 743 | cb->cb_msg.rpc_resp = NULL; |
| 744 | cb->cb_msg.rpc_cred = callback_cred; |
| 745 | |
| 746 | cb->cb_ops = &nfsd4_cb_probe_ops; |
| 747 | |
J. Bruce Fields | 229b2a0 | 2010-12-10 17:37:44 -0500 | [diff] [blame] | 748 | run_nfsd4_cb(cb); |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | /* |
J. Bruce Fields | 5a3c9d7 | 2010-10-19 17:56:52 -0400 | [diff] [blame] | 752 | * Poke the callback thread to process any updates to the callback |
| 753 | * parameters, and send a null probe. |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 754 | */ |
J. Bruce Fields | 5a3c9d7 | 2010-10-19 17:56:52 -0400 | [diff] [blame] | 755 | void nfsd4_probe_callback(struct nfs4_client *clp) |
| 756 | { |
J. Bruce Fields | 77a3569 | 2010-04-30 18:51:44 -0400 | [diff] [blame] | 757 | /* XXX: atomicity? Also, should we be using cl_cb_flags? */ |
| 758 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
J. Bruce Fields | 5a3c9d7 | 2010-10-19 17:56:52 -0400 | [diff] [blame] | 759 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); |
| 760 | do_probe_callback(clp); |
| 761 | } |
| 762 | |
J. Bruce Fields | 84f5f7c | 2010-12-09 15:52:19 -0500 | [diff] [blame] | 763 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
| 764 | { |
| 765 | nfsd4_probe_callback(clp); |
| 766 | flush_workqueue(callback_wq); |
| 767 | } |
| 768 | |
J. Bruce Fields | 5a3c9d7 | 2010-10-19 17:56:52 -0400 | [diff] [blame] | 769 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 770 | { |
J. Bruce Fields | 77a3569 | 2010-04-30 18:51:44 -0400 | [diff] [blame] | 771 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 772 | spin_lock(&clp->cl_lock); |
| 773 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 774 | spin_unlock(&clp->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | } |
| 776 | |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 777 | /* |
| 778 | * There's currently a single callback channel slot. |
| 779 | * If the slot is available, then mark it busy. Otherwise, set the |
| 780 | * thread for sleeping on the callback RPC wait queue. |
| 781 | */ |
J. Bruce Fields | 3ff3600 | 2011-01-10 16:37:51 -0500 | [diff] [blame] | 782 | static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 783 | { |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 784 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
| 785 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); |
| 786 | dprintk("%s slot is busy\n", __func__); |
J. Bruce Fields | 3ff3600 | 2011-01-10 16:37:51 -0500 | [diff] [blame] | 787 | return false; |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 788 | } |
J. Bruce Fields | 3ff3600 | 2011-01-10 16:37:51 -0500 | [diff] [blame] | 789 | return true; |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 790 | } |
| 791 | |
| 792 | /* |
| 793 | * TODO: cb_sequence should support referring call lists, cachethis, multiple |
| 794 | * slots, and mark callback channel down on communication errors. |
| 795 | */ |
| 796 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) |
| 797 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 798 | struct nfsd4_callback *cb = calldata; |
| 799 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
J. Bruce Fields | 2a74aba | 2011-09-23 17:20:02 -0400 | [diff] [blame] | 800 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
J. Bruce Fields | 8323c3b | 2010-10-19 19:36:51 -0400 | [diff] [blame] | 801 | u32 minorversion = clp->cl_minorversion; |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 802 | |
J. Bruce Fields | fb00392 | 2010-05-31 18:21:37 -0400 | [diff] [blame] | 803 | cb->cb_minorversion = minorversion; |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 804 | if (minorversion) { |
J. Bruce Fields | 3ff3600 | 2011-01-10 16:37:51 -0500 | [diff] [blame] | 805 | if (!nfsd41_cb_get_slot(clp, task)) |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 806 | return; |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 807 | } |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 808 | spin_lock(&clp->cl_lock); |
J. Bruce Fields | a8f2800 | 2011-01-14 14:25:48 -0500 | [diff] [blame] | 809 | if (list_empty(&cb->cb_per_client)) { |
| 810 | /* This is the first call, not a restart */ |
| 811 | cb->cb_done = false; |
| 812 | list_add(&cb->cb_per_client, &clp->cl_callbacks); |
| 813 | } |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 814 | spin_unlock(&clp->cl_lock); |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 815 | rpc_call_start(task); |
| 816 | } |
| 817 | |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 818 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
| 819 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 820 | struct nfsd4_callback *cb = calldata; |
| 821 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
J. Bruce Fields | 2a74aba | 2011-09-23 17:20:02 -0400 | [diff] [blame] | 822 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 823 | |
| 824 | dprintk("%s: minorversion=%d\n", __func__, |
J. Bruce Fields | 8323c3b | 2010-10-19 19:36:51 -0400 | [diff] [blame] | 825 | clp->cl_minorversion); |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 826 | |
J. Bruce Fields | 8323c3b | 2010-10-19 19:36:51 -0400 | [diff] [blame] | 827 | if (clp->cl_minorversion) { |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 828 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
J. Bruce Fields | ac7c46f | 2010-06-14 19:01:57 -0400 | [diff] [blame] | 829 | ++clp->cl_cb_session->se_cb_seq_nr; |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 830 | clear_bit(0, &clp->cl_cb_slot_busy); |
| 831 | rpc_wake_up_next(&clp->cl_cb_waitq); |
| 832 | dprintk("%s: freed slot, new seqid=%d\n", __func__, |
J. Bruce Fields | ac7c46f | 2010-06-14 19:01:57 -0400 | [diff] [blame] | 833 | clp->cl_cb_session->se_cb_seq_nr); |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 834 | |
| 835 | /* We're done looking into the sequence information */ |
| 836 | task->tk_msg.rpc_resp = NULL; |
| 837 | } |
| 838 | } |
| 839 | |
J. Bruce Fields | 4b21d0d | 2010-03-07 23:39:01 -0500 | [diff] [blame] | 840 | |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 841 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
| 842 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 843 | struct nfsd4_callback *cb = calldata; |
| 844 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
J. Bruce Fields | 2a74aba | 2011-09-23 17:20:02 -0400 | [diff] [blame] | 845 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
J. Bruce Fields | 4b21d0d | 2010-03-07 23:39:01 -0500 | [diff] [blame] | 846 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 847 | |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 848 | nfsd4_cb_done(task, calldata); |
| 849 | |
J. Bruce Fields | a8f2800 | 2011-01-14 14:25:48 -0500 | [diff] [blame] | 850 | if (current_rpc_client != task->tk_client) { |
| 851 | /* We're shutting down or changing cl_cb_client; leave |
| 852 | * it to nfsd4_process_cb_update to restart the call if |
| 853 | * necessary. */ |
J. Bruce Fields | 4b21d0d | 2010-03-07 23:39:01 -0500 | [diff] [blame] | 854 | return; |
| 855 | } |
| 856 | |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 857 | if (cb->cb_done) |
| 858 | return; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 859 | switch (task->tk_status) { |
J. Bruce Fields | 172c85d | 2010-05-30 11:53:12 -0400 | [diff] [blame] | 860 | case 0: |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 861 | cb->cb_done = true; |
J. Bruce Fields | 172c85d | 2010-05-30 11:53:12 -0400 | [diff] [blame] | 862 | return; |
| 863 | case -EBADHANDLE: |
| 864 | case -NFS4ERR_BAD_STATEID: |
| 865 | /* Race: client probably got cb_recall |
| 866 | * before open reply granting delegation */ |
| 867 | break; |
| 868 | default: |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 869 | /* Network partition? */ |
J. Bruce Fields | 77a3569 | 2010-04-30 18:51:44 -0400 | [diff] [blame] | 870 | nfsd4_mark_cb_down(clp, task->tk_status); |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 871 | } |
| 872 | if (dp->dl_retries--) { |
| 873 | rpc_delay(task, 2*HZ); |
| 874 | task->tk_status = 0; |
Boaz Harrosh | c18c821 | 2010-06-29 14:33:55 +0300 | [diff] [blame] | 875 | rpc_restart_call_prepare(task); |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 876 | return; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 877 | } |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 878 | nfsd4_mark_cb_down(clp, task->tk_status); |
| 879 | cb->cb_done = true; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | static void nfsd4_cb_recall_release(void *calldata) |
| 883 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 884 | struct nfsd4_callback *cb = calldata; |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 885 | struct nfs4_client *clp = cb->cb_clp; |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 886 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 887 | |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 888 | if (cb->cb_done) { |
| 889 | spin_lock(&clp->cl_lock); |
| 890 | list_del(&cb->cb_per_client); |
| 891 | spin_unlock(&clp->cl_lock); |
| 892 | nfs4_put_delegation(dp); |
| 893 | } |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 897 | .rpc_call_prepare = nfsd4_cb_prepare, |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 898 | .rpc_call_done = nfsd4_cb_recall_done, |
| 899 | .rpc_release = nfsd4_cb_recall_release, |
| 900 | }; |
| 901 | |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 902 | int nfsd4_create_callback_queue(void) |
| 903 | { |
| 904 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); |
| 905 | if (!callback_wq) |
| 906 | return -ENOMEM; |
| 907 | return 0; |
| 908 | } |
| 909 | |
| 910 | void nfsd4_destroy_callback_queue(void) |
| 911 | { |
| 912 | destroy_workqueue(callback_wq); |
| 913 | } |
| 914 | |
Benny Halevy | ab707e15 | 2010-05-12 00:14:06 +0300 | [diff] [blame] | 915 | /* must be called under the state lock */ |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 916 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 917 | { |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 918 | set_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags); |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 919 | /* |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 920 | * Note this won't actually result in a null callback; |
| 921 | * instead, nfsd4_do_callback_rpc() will detect the killed |
| 922 | * client, destroy the rpc client, and stop: |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 923 | */ |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 924 | do_probe_callback(clp); |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 925 | flush_workqueue(callback_wq); |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 926 | } |
| 927 | |
Kirill A. Shutemov | 65e4c89 | 2010-12-16 15:25:54 +0200 | [diff] [blame] | 928 | static void nfsd4_release_cb(struct nfsd4_callback *cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 930 | if (cb->cb_ops->rpc_release) |
| 931 | cb->cb_ops->rpc_release(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | } |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 933 | |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 934 | /* requires cl_lock: */ |
| 935 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) |
| 936 | { |
| 937 | struct nfsd4_session *s; |
| 938 | struct nfsd4_conn *c; |
| 939 | |
| 940 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { |
| 941 | list_for_each_entry(c, &s->se_conns, cn_persession) { |
| 942 | if (c->cn_flags & NFS4_CDFC4_BACK) |
| 943 | return c; |
| 944 | } |
| 945 | } |
| 946 | return NULL; |
| 947 | } |
| 948 | |
Kirill A. Shutemov | 65e4c89 | 2010-12-16 15:25:54 +0200 | [diff] [blame] | 949 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 950 | { |
| 951 | struct nfs4_cb_conn conn; |
| 952 | struct nfs4_client *clp = cb->cb_clp; |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 953 | struct nfsd4_session *ses = NULL; |
| 954 | struct nfsd4_conn *c; |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 955 | int err; |
| 956 | |
| 957 | /* |
| 958 | * This is either an update, or the client dying; in either case, |
| 959 | * kill the old client: |
| 960 | */ |
| 961 | if (clp->cl_cb_client) { |
| 962 | rpc_shutdown_client(clp->cl_cb_client); |
| 963 | clp->cl_cb_client = NULL; |
| 964 | } |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 965 | if (clp->cl_cb_conn.cb_xprt) { |
| 966 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); |
| 967 | clp->cl_cb_conn.cb_xprt = NULL; |
| 968 | } |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 969 | if (test_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags)) |
| 970 | return; |
| 971 | spin_lock(&clp->cl_lock); |
| 972 | /* |
| 973 | * Only serialized callback code is allowed to clear these |
| 974 | * flags; main nfsd code can only set them: |
| 975 | */ |
| 976 | BUG_ON(!clp->cl_cb_flags); |
| 977 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); |
| 978 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 979 | c = __nfsd4_find_backchannel(clp); |
| 980 | if (c) { |
| 981 | svc_xprt_get(c->cn_xprt); |
| 982 | conn.cb_xprt = c->cn_xprt; |
| 983 | ses = c->cn_session; |
| 984 | } |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 985 | spin_unlock(&clp->cl_lock); |
| 986 | |
J. Bruce Fields | dcbeaa6 | 2010-06-15 17:25:45 -0400 | [diff] [blame] | 987 | err = setup_callback_client(clp, &conn, ses); |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 988 | if (err) { |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 989 | warn_no_callback_path(clp, err); |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 990 | return; |
| 991 | } |
| 992 | /* Yay, the callback channel's back! Restart any callbacks: */ |
| 993 | list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client) |
| 994 | run_nfsd4_cb(cb); |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 995 | } |
| 996 | |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 997 | void nfsd4_do_callback_rpc(struct work_struct *w) |
| 998 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 999 | struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); |
J. Bruce Fields | fb00392 | 2010-05-31 18:21:37 -0400 | [diff] [blame] | 1000 | struct nfs4_client *clp = cb->cb_clp; |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 1001 | struct rpc_clnt *clnt; |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 1002 | |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 1003 | if (clp->cl_cb_flags) |
| 1004 | nfsd4_process_cb_update(cb); |
| 1005 | |
| 1006 | clnt = clp->cl_cb_client; |
| 1007 | if (!clnt) { |
| 1008 | /* Callback channel broken, or client killed; give up: */ |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 1009 | nfsd4_release_cb(cb); |
J. Bruce Fields | 6ff8da0 | 2010-06-04 20:04:45 -0400 | [diff] [blame] | 1010 | return; |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 1011 | } |
J. Bruce Fields | cee277d | 2010-05-26 17:52:14 -0400 | [diff] [blame] | 1012 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
| 1013 | cb->cb_ops, cb); |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 1014 | } |
| 1015 | |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 1016 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
| 1017 | { |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 1018 | struct nfsd4_callback *cb = &dp->dl_recall; |
J. Bruce Fields | 2a74aba | 2011-09-23 17:20:02 -0400 | [diff] [blame] | 1019 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 1020 | |
| 1021 | dp->dl_retries = 1; |
J. Bruce Fields | fb00392 | 2010-05-31 18:21:37 -0400 | [diff] [blame] | 1022 | cb->cb_op = dp; |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 1023 | cb->cb_clp = clp; |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 1024 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; |
J. Bruce Fields | fb00392 | 2010-05-31 18:21:37 -0400 | [diff] [blame] | 1025 | cb->cb_msg.rpc_argp = cb; |
| 1026 | cb->cb_msg.rpc_resp = cb; |
J. Bruce Fields | 5878453 | 2010-05-16 16:47:08 -0400 | [diff] [blame] | 1027 | cb->cb_msg.rpc_cred = callback_cred; |
| 1028 | |
| 1029 | cb->cb_ops = &nfsd4_cb_recall_ops; |
| 1030 | dp->dl_retries = 1; |
| 1031 | |
J. Bruce Fields | 9ee1ba5 | 2011-01-13 17:08:19 -0500 | [diff] [blame] | 1032 | INIT_LIST_HEAD(&cb->cb_per_client); |
J. Bruce Fields | 5ce8ba2 | 2011-01-10 16:44:41 -0500 | [diff] [blame] | 1033 | cb->cb_done = true; |
| 1034 | |
J. Bruce Fields | 229b2a0 | 2010-12-10 17:37:44 -0500 | [diff] [blame] | 1035 | run_nfsd4_cb(&dp->dl_recall); |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame] | 1036 | } |