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> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 36 | #include "nfsd.h" |
| 37 | #include "state.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define NFSDDBG_FACILITY NFSDDBG_PROC |
| 40 | |
| 41 | #define NFSPROC4_CB_NULL 0 |
| 42 | #define NFSPROC4_CB_COMPOUND 1 |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 43 | #define NFS4_STATEID_SIZE 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | /* Index of predefined Linux callback client operations */ |
| 46 | |
| 47 | enum { |
Benny Halevy | 4be36ca | 2009-09-10 12:25:46 +0300 | [diff] [blame] | 48 | NFSPROC4_CLNT_CB_NULL = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | NFSPROC4_CLNT_CB_RECALL, |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 50 | NFSPROC4_CLNT_CB_SEQUENCE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | }; |
| 52 | |
| 53 | enum nfs_cb_opnum4 { |
| 54 | OP_CB_RECALL = 4, |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 55 | OP_CB_SEQUENCE = 11, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | #define NFS4_MAXTAGLEN 20 |
| 59 | |
| 60 | #define NFS4_enc_cb_null_sz 0 |
| 61 | #define NFS4_dec_cb_null_sz 0 |
| 62 | #define cb_compound_enc_hdr_sz 4 |
| 63 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 64 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
| 65 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ |
| 66 | 1 /* no referring calls list yet */) |
| 67 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #define op_enc_sz 1 |
| 70 | #define op_dec_sz 2 |
| 71 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) |
Benny Halevy | 0ac68d1 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 72 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 74 | cb_sequence_enc_sz + \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | 1 + enc_stateid_sz + \ |
| 76 | enc_nfs4_fh_sz) |
| 77 | |
| 78 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 79 | cb_sequence_dec_sz + \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | op_dec_sz) |
| 81 | |
| 82 | /* |
| 83 | * Generic encode routines from fs/nfs/nfs4xdr.c |
| 84 | */ |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 85 | static inline __be32 * |
| 86 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | { |
| 88 | int tmp = XDR_QUADLEN(nbytes); |
| 89 | if (!tmp) |
| 90 | return p; |
| 91 | p[tmp-1] = 0; |
| 92 | memcpy(p, ptr, nbytes); |
| 93 | return p + tmp; |
| 94 | } |
| 95 | |
| 96 | #define WRITE32(n) *p++ = htonl(n) |
| 97 | #define WRITEMEM(ptr,nbytes) do { \ |
| 98 | p = xdr_writemem(p, ptr, nbytes); \ |
| 99 | } while (0) |
| 100 | #define RESERVE_SPACE(nbytes) do { \ |
| 101 | p = xdr_reserve_space(xdr, nbytes); \ |
Harvey Harrison | 8e24eea | 2008-04-30 00:55:09 -0700 | [diff] [blame] | 102 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | BUG_ON(!p); \ |
| 104 | } while (0) |
| 105 | |
| 106 | /* |
| 107 | * Generic decode routines from fs/nfs/nfs4xdr.c |
| 108 | */ |
| 109 | #define DECODE_TAIL \ |
| 110 | status = 0; \ |
| 111 | out: \ |
| 112 | return status; \ |
| 113 | xdr_error: \ |
| 114 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ |
| 115 | status = -EIO; \ |
| 116 | goto out |
| 117 | |
| 118 | #define READ32(x) (x) = ntohl(*p++) |
| 119 | #define READ64(x) do { \ |
| 120 | (x) = (u64)ntohl(*p++) << 32; \ |
| 121 | (x) |= ntohl(*p++); \ |
| 122 | } while (0) |
| 123 | #define READTIME(x) do { \ |
| 124 | p++; \ |
| 125 | (x.tv_sec) = ntohl(*p++); \ |
| 126 | (x.tv_nsec) = ntohl(*p++); \ |
| 127 | } while (0) |
| 128 | #define READ_BUF(nbytes) do { \ |
| 129 | p = xdr_inline_decode(xdr, nbytes); \ |
| 130 | if (!p) { \ |
Greg Banks | 3e3b480 | 2006-10-02 02:17:41 -0700 | [diff] [blame] | 131 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
Harvey Harrison | 8e24eea | 2008-04-30 00:55:09 -0700 | [diff] [blame] | 132 | __func__, __LINE__); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | return -EIO; \ |
| 134 | } \ |
| 135 | } while (0) |
| 136 | |
| 137 | struct nfs4_cb_compound_hdr { |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 138 | /* args */ |
| 139 | u32 ident; /* minorversion 0 only */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | u32 nops; |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 141 | __be32 *nops_p; |
Andy Adamson | ab52ae6 | 2009-06-16 04:20:53 +0300 | [diff] [blame] | 142 | u32 minorversion; |
Andy Adamson | 38524ab | 2009-09-10 12:25:59 +0300 | [diff] [blame] | 143 | /* res */ |
| 144 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | u32 taglen; |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 146 | char *tag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | }; |
| 148 | |
| 149 | static struct { |
| 150 | int stat; |
| 151 | int errno; |
| 152 | } nfs_cb_errtbl[] = { |
| 153 | { NFS4_OK, 0 }, |
| 154 | { NFS4ERR_PERM, EPERM }, |
| 155 | { NFS4ERR_NOENT, ENOENT }, |
| 156 | { NFS4ERR_IO, EIO }, |
| 157 | { NFS4ERR_NXIO, ENXIO }, |
| 158 | { NFS4ERR_ACCESS, EACCES }, |
| 159 | { NFS4ERR_EXIST, EEXIST }, |
| 160 | { NFS4ERR_XDEV, EXDEV }, |
| 161 | { NFS4ERR_NOTDIR, ENOTDIR }, |
| 162 | { NFS4ERR_ISDIR, EISDIR }, |
| 163 | { NFS4ERR_INVAL, EINVAL }, |
| 164 | { NFS4ERR_FBIG, EFBIG }, |
| 165 | { NFS4ERR_NOSPC, ENOSPC }, |
| 166 | { NFS4ERR_ROFS, EROFS }, |
| 167 | { NFS4ERR_MLINK, EMLINK }, |
| 168 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, |
| 169 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, |
| 170 | { NFS4ERR_DQUOT, EDQUOT }, |
| 171 | { NFS4ERR_STALE, ESTALE }, |
| 172 | { NFS4ERR_BADHANDLE, EBADHANDLE }, |
| 173 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, |
| 174 | { NFS4ERR_NOTSUPP, ENOTSUPP }, |
| 175 | { NFS4ERR_TOOSMALL, ETOOSMALL }, |
| 176 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, |
| 177 | { NFS4ERR_BADTYPE, EBADTYPE }, |
| 178 | { NFS4ERR_LOCKED, EAGAIN }, |
| 179 | { NFS4ERR_RESOURCE, EREMOTEIO }, |
| 180 | { NFS4ERR_SYMLINK, ELOOP }, |
| 181 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, |
| 182 | { NFS4ERR_DEADLOCK, EDEADLK }, |
| 183 | { -1, EIO } |
| 184 | }; |
| 185 | |
| 186 | static int |
| 187 | nfs_cb_stat_to_errno(int stat) |
| 188 | { |
| 189 | int i; |
| 190 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { |
| 191 | if (nfs_cb_errtbl[i].stat == stat) |
| 192 | return nfs_cb_errtbl[i].errno; |
| 193 | } |
| 194 | /* If we cannot translate the error, the recovery routines should |
| 195 | * handle it. |
| 196 | * Note: remaining NFSv4 error codes have values > 10000, so should |
| 197 | * not conflict with native Linux error codes. |
| 198 | */ |
| 199 | return stat; |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * XDR encode |
| 204 | */ |
| 205 | |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 206 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
| 208 | { |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 209 | __be32 * p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | RESERVE_SPACE(16); |
| 212 | WRITE32(0); /* tag length is always 0 */ |
Andy Adamson | ab52ae6 | 2009-06-16 04:20:53 +0300 | [diff] [blame] | 213 | WRITE32(hdr->minorversion); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | WRITE32(hdr->ident); |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 215 | hdr->nops_p = p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | WRITE32(hdr->nops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 219 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
| 220 | { |
| 221 | *hdr->nops_p = htonl(hdr->nops); |
| 222 | } |
| 223 | |
| 224 | static void |
| 225 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, |
| 226 | struct nfs4_cb_compound_hdr *hdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | { |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 228 | __be32 *p; |
J. Bruce Fields | b53d40c | 2009-05-01 19:50:00 -0400 | [diff] [blame] | 229 | int len = dp->dl_fh.fh_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
J. Bruce Fields | b53d40c | 2009-05-01 19:50:00 -0400 | [diff] [blame] | 231 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | WRITE32(OP_CB_RECALL); |
J. Bruce Fields | b53d40c | 2009-05-01 19:50:00 -0400 | [diff] [blame] | 233 | WRITE32(dp->dl_stateid.si_generation); |
| 234 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); |
J. Bruce Fields | 6707bd3 | 2009-05-01 19:57:46 -0400 | [diff] [blame] | 235 | WRITE32(0); /* truncate optimization not implemented */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | WRITE32(len); |
J. Bruce Fields | b53d40c | 2009-05-01 19:50:00 -0400 | [diff] [blame] | 237 | WRITEMEM(&dp->dl_fh.fh_base, len); |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 238 | hdr->nops++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 241 | static void |
| 242 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, |
| 243 | struct nfs4_cb_compound_hdr *hdr) |
| 244 | { |
| 245 | __be32 *p; |
| 246 | |
| 247 | if (hdr->minorversion == 0) |
| 248 | return; |
| 249 | |
| 250 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); |
| 251 | |
| 252 | WRITE32(OP_CB_SEQUENCE); |
| 253 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); |
| 254 | WRITE32(args->cbs_clp->cl_cb_seq_nr); |
| 255 | WRITE32(0); /* slotid, always 0 */ |
| 256 | WRITE32(0); /* highest slotid always 0 */ |
| 257 | WRITE32(0); /* cachethis always 0 */ |
| 258 | WRITE32(0); /* FIXME: support referring_call_lists */ |
| 259 | hdr->nops++; |
| 260 | } |
| 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | static int |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 263 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | { |
| 265 | struct xdr_stream xdrs, *xdr = &xdrs; |
| 266 | |
| 267 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); |
| 268 | RESERVE_SPACE(0); |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 273 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, |
| 274 | struct nfs4_rpc_args *rpc_args) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
| 276 | struct xdr_stream xdr; |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 277 | struct nfs4_delegation *args = rpc_args->args_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | struct nfs4_cb_compound_hdr hdr = { |
J. Bruce Fields | b53d40c | 2009-05-01 19:50:00 -0400 | [diff] [blame] | 279 | .ident = args->dl_ident, |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 280 | .minorversion = rpc_args->args_seq.cbs_minorversion, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | }; |
| 282 | |
| 283 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); |
| 284 | encode_cb_compound_hdr(&xdr, &hdr); |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 285 | encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr); |
Andy Adamson | ef52bff | 2009-06-16 04:20:50 +0300 | [diff] [blame] | 286 | encode_cb_recall(&xdr, args, &hdr); |
| 287 | encode_cb_nops(&hdr); |
| 288 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | |
| 292 | static int |
| 293 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 294 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
| 296 | READ_BUF(8); |
| 297 | READ32(hdr->status); |
| 298 | READ32(hdr->taglen); |
| 299 | READ_BUF(hdr->taglen + 4); |
| 300 | hdr->tag = (char *)p; |
| 301 | p += XDR_QUADLEN(hdr->taglen); |
| 302 | READ32(hdr->nops); |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | static int |
| 307 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) |
| 308 | { |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 309 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | u32 op; |
| 311 | int32_t nfserr; |
| 312 | |
| 313 | READ_BUF(8); |
| 314 | READ32(op); |
| 315 | if (op != expected) { |
| 316 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " |
| 317 | " operation %d but we issued a request for %d\n", |
| 318 | op, expected); |
| 319 | return -EIO; |
| 320 | } |
| 321 | READ32(nfserr); |
| 322 | if (nfserr != NFS_OK) |
| 323 | return -nfs_cb_stat_to_errno(nfserr); |
| 324 | return 0; |
| 325 | } |
| 326 | |
Benny Halevy | 2af7358 | 2009-09-10 12:26:51 +0300 | [diff] [blame] | 327 | /* |
| 328 | * Our current back channel implmentation supports a single backchannel |
| 329 | * with a single slot. |
| 330 | */ |
| 331 | static int |
| 332 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, |
| 333 | struct rpc_rqst *rqstp) |
| 334 | { |
| 335 | struct nfs4_sessionid id; |
| 336 | int status; |
| 337 | u32 dummy; |
| 338 | __be32 *p; |
| 339 | |
| 340 | if (res->cbs_minorversion == 0) |
| 341 | return 0; |
| 342 | |
| 343 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); |
| 344 | if (status) |
| 345 | return status; |
| 346 | |
| 347 | /* |
| 348 | * If the server returns different values for sessionID, slotID or |
| 349 | * sequence number, the server is looney tunes. |
| 350 | */ |
| 351 | status = -ESERVERFAULT; |
| 352 | |
| 353 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); |
| 354 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); |
| 355 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); |
| 356 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, |
| 357 | NFS4_MAX_SESSIONID_LEN)) { |
| 358 | dprintk("%s Invalid session id\n", __func__); |
| 359 | goto out; |
| 360 | } |
| 361 | READ32(dummy); |
| 362 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { |
| 363 | dprintk("%s Invalid sequence number\n", __func__); |
| 364 | goto out; |
| 365 | } |
| 366 | READ32(dummy); /* slotid must be 0 */ |
| 367 | if (dummy != 0) { |
| 368 | dprintk("%s Invalid slotid\n", __func__); |
| 369 | goto out; |
| 370 | } |
| 371 | /* FIXME: process highest slotid and target highest slotid */ |
| 372 | status = 0; |
| 373 | out: |
| 374 | return status; |
| 375 | } |
| 376 | |
| 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | static int |
Al Viro | f00f328 | 2006-10-19 23:29:01 -0700 | [diff] [blame] | 379 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static int |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 385 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, |
| 386 | struct nfsd4_cb_sequence *seq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | { |
| 388 | struct xdr_stream xdr; |
| 389 | struct nfs4_cb_compound_hdr hdr; |
| 390 | int status; |
| 391 | |
| 392 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); |
| 393 | status = decode_cb_compound_hdr(&xdr, &hdr); |
| 394 | if (status) |
| 395 | goto out; |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 396 | if (seq) { |
| 397 | status = decode_cb_sequence(&xdr, seq, rqstp); |
| 398 | if (status) |
| 399 | goto out; |
| 400 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); |
| 402 | out: |
| 403 | return status; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * RPC procedure tables |
| 408 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | #define PROC(proc, call, argtype, restype) \ |
| 410 | [NFSPROC4_CLNT_##proc] = { \ |
| 411 | .p_proc = NFSPROC4_CB_##call, \ |
| 412 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ |
| 413 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ |
Chuck Lever | 2bea90d | 2007-03-29 16:47:53 -0400 | [diff] [blame] | 414 | .p_arglen = NFS4_##argtype##_sz, \ |
| 415 | .p_replen = NFS4_##restype##_sz, \ |
Chuck Lever | cc0175c | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 416 | .p_statidx = NFSPROC4_CB_##call, \ |
| 417 | .p_name = #proc, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | |
NeilBrown | fd39ca9 | 2005-06-23 22:04:03 -0700 | [diff] [blame] | 420 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
| 422 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), |
| 423 | }; |
| 424 | |
NeilBrown | fd39ca9 | 2005-06-23 22:04:03 -0700 | [diff] [blame] | 425 | static struct rpc_version nfs_cb_version4 = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | .number = 1, |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 427 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | .procs = nfs4_cb_procedures |
| 429 | }; |
| 430 | |
| 431 | static struct rpc_version * nfs_cb_version[] = { |
| 432 | NULL, |
| 433 | &nfs_cb_version4, |
| 434 | }; |
| 435 | |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 436 | static struct rpc_program cb_program; |
| 437 | |
| 438 | static struct rpc_stat cb_stats = { |
| 439 | .program = &cb_program |
| 440 | }; |
| 441 | |
| 442 | #define NFS4_CALLBACK 0x40000000 |
| 443 | static struct rpc_program cb_program = { |
| 444 | .name = "nfs4_cb", |
| 445 | .number = NFS4_CALLBACK, |
| 446 | .nrvers = ARRAY_SIZE(nfs_cb_version), |
| 447 | .version = nfs_cb_version, |
| 448 | .stats = &cb_stats, |
Olga Kornievskaia | 61054b1 | 2008-12-23 16:19:00 -0500 | [diff] [blame] | 449 | .pipe_dir_name = "/nfsd4_cb", |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 450 | }; |
| 451 | |
J. Bruce Fields | 595947a | 2009-03-05 17:18:10 -0500 | [diff] [blame] | 452 | static int max_cb_time(void) |
| 453 | { |
J. Bruce Fields | cf07d2e | 2010-02-28 23:20:19 -0500 | [diff] [blame] | 454 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
J. Bruce Fields | 595947a | 2009-03-05 17:18:10 -0500 | [diff] [blame] | 455 | } |
| 456 | |
J. Bruce Fields | 2b47eec | 2007-07-27 18:06:50 -0400 | [diff] [blame] | 457 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
| 458 | * And why is cb_set an atomic? */ |
| 459 | |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 460 | int setup_callback_client(struct nfs4_client *clp) |
J. Bruce Fields | 2b47eec | 2007-07-27 18:06:50 -0400 | [diff] [blame] | 461 | { |
J. Bruce Fields | c237dc0 | 2009-04-29 19:09:19 -0400 | [diff] [blame] | 462 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 463 | struct rpc_timeout timeparms = { |
J. Bruce Fields | 595947a | 2009-03-05 17:18:10 -0500 | [diff] [blame] | 464 | .to_initval = max_cb_time(), |
| 465 | .to_retries = 0, |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 466 | }; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 467 | struct rpc_create_args args = { |
Alexandros Batsakis | 3ddc8bf | 2009-09-10 12:27:21 +0300 | [diff] [blame] | 468 | .protocol = XPRT_TRANSPORT_TCP, |
Jeff Layton | aa9a4ec | 2009-08-14 12:57:57 -0400 | [diff] [blame] | 469 | .address = (struct sockaddr *) &cb->cb_addr, |
| 470 | .addrsize = cb->cb_addrlen, |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 471 | .timeout = &timeparms, |
Olga Kornievskaia | ff7d975 | 2008-03-28 16:04:56 -0400 | [diff] [blame] | 472 | .program = &cb_program, |
Benny Halevy | d5b337b | 2008-09-28 09:21:26 +0300 | [diff] [blame] | 473 | .prognumber = cb->cb_prog, |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 474 | .version = nfs_cb_version[1]->number, |
Olga Kornievskaia | 61054b1 | 2008-12-23 16:19:00 -0500 | [diff] [blame] | 475 | .authflavor = clp->cl_flavor, |
Olga Kornievskaia | b6b6152 | 2008-06-09 16:51:31 -0400 | [diff] [blame] | 476 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
Olga Kornievskaia | 608207e | 2008-12-23 16:17:40 -0500 | [diff] [blame] | 477 | .client_name = clp->cl_principal, |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 478 | }; |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 479 | struct rpc_clnt *client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
J. Bruce Fields | 418cd20 | 2009-02-22 15:52:13 -0800 | [diff] [blame] | 481 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 482 | return -EINVAL; |
Alexandros Batsakis | 3ddc8bf | 2009-09-10 12:27:21 +0300 | [diff] [blame] | 483 | if (cb->cb_minorversion) { |
| 484 | args.bc_xprt = clp->cl_cb_xprt; |
| 485 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
| 486 | } |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 487 | /* Create RPC client */ |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 488 | client = rpc_create(&args); |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 489 | if (IS_ERR(client)) { |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 490 | dprintk("NFSD: couldn't create callback client: %ld\n", |
| 491 | PTR_ERR(client)); |
J. Bruce Fields | e1cab5a5 | 2009-02-23 10:45:27 -0800 | [diff] [blame] | 492 | return PTR_ERR(client); |
| 493 | } |
| 494 | cb->cb_client = client; |
| 495 | return 0; |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 496 | |
| 497 | } |
| 498 | |
J. Bruce Fields | ecdd03b | 2009-02-23 19:35:22 -0800 | [diff] [blame] | 499 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
| 500 | { |
| 501 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", |
| 502 | (int)clp->cl_name.len, clp->cl_name.data, reason); |
| 503 | } |
| 504 | |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 505 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
| 506 | { |
| 507 | struct nfs4_client *clp = calldata; |
| 508 | |
| 509 | if (task->tk_status) |
| 510 | warn_no_callback_path(clp, task->tk_status); |
| 511 | else |
J. Bruce Fields | c237dc0 | 2009-04-29 19:09:19 -0400 | [diff] [blame] | 512 | atomic_set(&clp->cl_cb_conn.cb_set, 1); |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 513 | } |
| 514 | |
| 515 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { |
| 516 | .rpc_call_done = nfsd4_cb_probe_done, |
| 517 | }; |
| 518 | |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 519 | static struct rpc_cred *callback_cred; |
J. Bruce Fields | 3cef9ab | 2009-02-23 21:42:10 -0800 | [diff] [blame] | 520 | |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 521 | int set_callback_cred(void) |
| 522 | { |
J. Bruce Fields | 8d75da8a | 2010-03-03 16:13:29 -0500 | [diff] [blame] | 523 | if (callback_cred) |
| 524 | return 0; |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 525 | callback_cred = rpc_lookup_machine_cred(); |
| 526 | if (!callback_cred) |
| 527 | return -ENOMEM; |
| 528 | return 0; |
J. Bruce Fields | 3cef9ab | 2009-02-23 21:42:10 -0800 | [diff] [blame] | 529 | } |
| 530 | |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 531 | |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 532 | void do_probe_callback(struct nfs4_client *clp) |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 533 | { |
J. Bruce Fields | c237dc0 | 2009-04-29 19:09:19 -0400 | [diff] [blame] | 534 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 535 | struct rpc_message msg = { |
| 536 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], |
| 537 | .rpc_argp = clp, |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 538 | .rpc_cred = callback_cred |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 539 | }; |
J. Bruce Fields | a601cae | 2009-02-22 16:43:45 -0800 | [diff] [blame] | 540 | int status; |
| 541 | |
Chuck Lever | 58255a4 | 2010-02-24 13:48:06 -0800 | [diff] [blame] | 542 | status = rpc_call_async(cb->cb_client, &msg, |
| 543 | RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 544 | &nfsd4_cb_probe_ops, (void *)clp); |
J. Bruce Fields | 9045b4b | 2010-02-21 17:53:04 -0800 | [diff] [blame] | 545 | if (status) |
J. Bruce Fields | ecdd03b | 2009-02-23 19:35:22 -0800 | [diff] [blame] | 546 | warn_no_callback_path(clp, status); |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | /* |
| 550 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... |
| 551 | */ |
| 552 | void |
| 553 | nfsd4_probe_callback(struct nfs4_client *clp) |
| 554 | { |
J. Bruce Fields | ecdd03b | 2009-02-23 19:35:22 -0800 | [diff] [blame] | 555 | int status; |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 556 | |
J. Bruce Fields | c237dc0 | 2009-04-29 19:09:19 -0400 | [diff] [blame] | 557 | BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set)); |
J. Bruce Fields | 63c8671 | 2007-10-25 19:00:26 -0400 | [diff] [blame] | 558 | |
J. Bruce Fields | ecdd03b | 2009-02-23 19:35:22 -0800 | [diff] [blame] | 559 | status = setup_callback_client(clp); |
| 560 | if (status) { |
| 561 | warn_no_callback_path(clp, status); |
| 562 | return; |
| 563 | } |
J. Bruce Fields | e300a63 | 2009-03-05 15:01:11 -0500 | [diff] [blame] | 564 | do_probe_callback(clp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 567 | /* |
| 568 | * There's currently a single callback channel slot. |
| 569 | * If the slot is available, then mark it busy. Otherwise, set the |
| 570 | * thread for sleeping on the callback RPC wait queue. |
| 571 | */ |
| 572 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, |
| 573 | struct rpc_task *task) |
| 574 | { |
| 575 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; |
| 576 | u32 *ptr = (u32 *)clp->cl_sessionid.data; |
| 577 | int status = 0; |
| 578 | |
| 579 | dprintk("%s: %u:%u:%u:%u\n", __func__, |
| 580 | ptr[0], ptr[1], ptr[2], ptr[3]); |
| 581 | |
| 582 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
| 583 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); |
| 584 | dprintk("%s slot is busy\n", __func__); |
| 585 | status = -EAGAIN; |
| 586 | goto out; |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * We'll need the clp during XDR encoding and decoding, |
| 591 | * and the sequence during decoding to verify the reply |
| 592 | */ |
| 593 | args->args_seq.cbs_clp = clp; |
| 594 | task->tk_msg.rpc_resp = &args->args_seq; |
| 595 | |
| 596 | out: |
| 597 | dprintk("%s status=%d\n", __func__, status); |
| 598 | return status; |
| 599 | } |
| 600 | |
| 601 | /* |
| 602 | * TODO: cb_sequence should support referring call lists, cachethis, multiple |
| 603 | * slots, and mark callback channel down on communication errors. |
| 604 | */ |
| 605 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) |
| 606 | { |
| 607 | struct nfs4_delegation *dp = calldata; |
| 608 | struct nfs4_client *clp = dp->dl_client; |
| 609 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; |
| 610 | u32 minorversion = clp->cl_cb_conn.cb_minorversion; |
| 611 | int status = 0; |
| 612 | |
| 613 | args->args_seq.cbs_minorversion = minorversion; |
| 614 | if (minorversion) { |
| 615 | status = nfsd41_cb_setup_sequence(clp, task); |
| 616 | if (status) { |
| 617 | if (status != -EAGAIN) { |
| 618 | /* terminate rpc task */ |
| 619 | task->tk_status = status; |
| 620 | task->tk_action = NULL; |
| 621 | } |
| 622 | return; |
| 623 | } |
| 624 | } |
| 625 | rpc_call_start(task); |
| 626 | } |
| 627 | |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 628 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
| 629 | { |
| 630 | struct nfs4_delegation *dp = calldata; |
| 631 | struct nfs4_client *clp = dp->dl_client; |
| 632 | |
| 633 | dprintk("%s: minorversion=%d\n", __func__, |
| 634 | clp->cl_cb_conn.cb_minorversion); |
| 635 | |
| 636 | if (clp->cl_cb_conn.cb_minorversion) { |
| 637 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
| 638 | ++clp->cl_cb_seq_nr; |
| 639 | clear_bit(0, &clp->cl_cb_slot_busy); |
| 640 | rpc_wake_up_next(&clp->cl_cb_waitq); |
| 641 | dprintk("%s: freed slot, new seqid=%d\n", __func__, |
| 642 | clp->cl_cb_seq_nr); |
| 643 | |
| 644 | /* We're done looking into the sequence information */ |
| 645 | task->tk_msg.rpc_resp = NULL; |
| 646 | } |
| 647 | } |
| 648 | |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 649 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
| 650 | { |
| 651 | struct nfs4_delegation *dp = calldata; |
| 652 | struct nfs4_client *clp = dp->dl_client; |
| 653 | |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 654 | nfsd4_cb_done(task, calldata); |
| 655 | |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 656 | switch (task->tk_status) { |
| 657 | case -EIO: |
| 658 | /* Network partition? */ |
| 659 | atomic_set(&clp->cl_cb_conn.cb_set, 0); |
| 660 | warn_no_callback_path(clp, task->tk_status); |
| 661 | case -EBADHANDLE: |
| 662 | case -NFS4ERR_BAD_STATEID: |
| 663 | /* Race: client probably got cb_recall |
| 664 | * before open reply granting delegation */ |
| 665 | break; |
| 666 | default: |
| 667 | /* success, or error we can't handle */ |
J. Bruce Fields | 227f98d9 | 2010-02-18 08:27:24 -0800 | [diff] [blame] | 668 | return; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 669 | } |
| 670 | if (dp->dl_retries--) { |
| 671 | rpc_delay(task, 2*HZ); |
| 672 | task->tk_status = 0; |
| 673 | rpc_restart_call(task); |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 674 | return; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 675 | } else { |
| 676 | atomic_set(&clp->cl_cb_conn.cb_set, 0); |
| 677 | warn_no_callback_path(clp, task->tk_status); |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | static void nfsd4_cb_recall_release(void *calldata) |
| 682 | { |
| 683 | struct nfs4_delegation *dp = calldata; |
| 684 | struct nfs4_client *clp = dp->dl_client; |
| 685 | |
| 686 | nfs4_put_delegation(dp); |
| 687 | put_nfs4_client(clp); |
| 688 | } |
| 689 | |
| 690 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { |
Ricardo Labiaga | 2a1d1b5 | 2009-09-10 12:26:38 +0300 | [diff] [blame] | 691 | .rpc_call_prepare = nfsd4_cb_prepare, |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 692 | .rpc_call_done = nfsd4_cb_recall_done, |
| 693 | .rpc_release = nfsd4_cb_recall_release, |
| 694 | }; |
| 695 | |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame^] | 696 | static struct workqueue_struct *callback_wq; |
| 697 | |
| 698 | int nfsd4_create_callback_queue(void) |
| 699 | { |
| 700 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); |
| 701 | if (!callback_wq) |
| 702 | return -ENOMEM; |
| 703 | return 0; |
| 704 | } |
| 705 | |
| 706 | void nfsd4_destroy_callback_queue(void) |
| 707 | { |
| 708 | destroy_workqueue(callback_wq); |
| 709 | } |
| 710 | |
| 711 | void nfsd4_set_callback_client(struct nfs4_client *clp, struct rpc_clnt |
| 712 | *new) |
| 713 | { |
| 714 | struct rpc_clnt *old = clp->cl_cb_conn.cb_client; |
| 715 | |
| 716 | clp->cl_cb_conn.cb_client = new; |
| 717 | /* |
| 718 | * After this, any work that saw the old value of cb_client will |
| 719 | * be gone: |
| 720 | */ |
| 721 | flush_workqueue(callback_wq); |
| 722 | /* So we can safely shut it down: */ |
| 723 | if (old) |
| 724 | rpc_shutdown_client(old); |
| 725 | } |
| 726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | /* |
| 728 | * called with dp->dl_count inc'ed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | */ |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame^] | 730 | static void _nfsd4_cb_recall(struct nfs4_delegation *dp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | { |
| 732 | struct nfs4_client *clp = dp->dl_client; |
J. Bruce Fields | c237dc0 | 2009-04-29 19:09:19 -0400 | [diff] [blame] | 733 | struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; |
J. Bruce Fields | 227f98d9 | 2010-02-18 08:27:24 -0800 | [diff] [blame] | 734 | struct nfs4_rpc_args *args = &dp->dl_recall.cb_args; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | struct rpc_message msg = { |
| 736 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], |
J. Bruce Fields | 80fc015 | 2009-09-15 18:07:35 -0400 | [diff] [blame] | 737 | .rpc_cred = callback_cred |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | }; |
J. Bruce Fields | 227f98d9 | 2010-02-18 08:27:24 -0800 | [diff] [blame] | 739 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame^] | 741 | if (clnt == NULL) |
| 742 | return; /* Client is shutting down; give up. */ |
| 743 | |
Ricardo Labiaga | 0421b5c | 2009-09-10 12:27:04 +0300 | [diff] [blame] | 744 | args->args_op = dp; |
| 745 | msg.rpc_argp = args; |
J. Bruce Fields | 3aea09d | 2009-05-01 20:11:12 -0400 | [diff] [blame] | 746 | dp->dl_retries = 1; |
J. Bruce Fields | 63e4863 | 2009-05-01 22:36:55 -0400 | [diff] [blame] | 747 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
| 748 | &nfsd4_cb_recall_ops, dp); |
| 749 | if (status) { |
| 750 | put_nfs4_client(clp); |
| 751 | nfs4_put_delegation(dp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
J. Bruce Fields | b5a1a81 | 2010-03-03 14:52:55 -0500 | [diff] [blame^] | 754 | |
| 755 | void nfsd4_do_callback_rpc(struct work_struct *w) |
| 756 | { |
| 757 | /* XXX: for now, just send off delegation recall. */ |
| 758 | /* In future, generalize to handle any sort of callback. */ |
| 759 | struct nfsd4_callback *c = container_of(w, struct nfsd4_callback, cb_work); |
| 760 | struct nfs4_delegation *dp = container_of(c, struct nfs4_delegation, dl_recall); |
| 761 | |
| 762 | _nfsd4_cb_recall(dp); |
| 763 | } |
| 764 | |
| 765 | |
| 766 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
| 767 | { |
| 768 | queue_work(callback_wq, &dp->dl_recall.cb_work); |
| 769 | } |