Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Common NFS I/O operations for the pnfs file based |
| 3 | * layout drivers. |
| 4 | * |
| 5 | * Copyright (c) 2014, Primary Data, Inc. All rights reserved. |
| 6 | * |
| 7 | * Tom Haynes <loghyr@primarydata.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/nfs_fs.h> |
| 11 | #include <linux/nfs_page.h> |
Peng Tao | 6b7f3cf | 2014-05-29 21:06:59 +0800 | [diff] [blame^] | 12 | #include <linux/sunrpc/addr.h> |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 13 | |
| 14 | #include "internal.h" |
| 15 | #include "pnfs.h" |
| 16 | |
Peng Tao | 875ae06 | 2014-05-29 21:06:57 +0800 | [diff] [blame] | 17 | #define NFSDBG_FACILITY NFSDBG_PNFS |
| 18 | |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 19 | static void pnfs_generic_fenceme(struct inode *inode, |
| 20 | struct pnfs_layout_hdr *lo) |
| 21 | { |
| 22 | if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) |
| 23 | return; |
| 24 | pnfs_return_layout(inode); |
| 25 | } |
| 26 | |
| 27 | void pnfs_generic_rw_release(void *data) |
| 28 | { |
| 29 | struct nfs_pgio_header *hdr = data; |
| 30 | struct pnfs_layout_hdr *lo = hdr->lseg->pls_layout; |
| 31 | |
| 32 | pnfs_generic_fenceme(lo->plh_inode, lo); |
| 33 | nfs_put_client(hdr->ds_clp); |
| 34 | hdr->mds_ops->rpc_release(data); |
| 35 | } |
| 36 | EXPORT_SYMBOL_GPL(pnfs_generic_rw_release); |
| 37 | |
| 38 | /* Fake up some data that will cause nfs_commit_release to retry the writes. */ |
| 39 | void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data) |
| 40 | { |
| 41 | struct nfs_page *first = nfs_list_entry(data->pages.next); |
| 42 | |
| 43 | data->task.tk_status = 0; |
| 44 | memcpy(&data->verf.verifier, &first->wb_verf, |
| 45 | sizeof(data->verf.verifier)); |
| 46 | data->verf.verifier.data[0]++; /* ensure verifier mismatch */ |
| 47 | } |
| 48 | EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes); |
| 49 | |
| 50 | void pnfs_generic_write_commit_done(struct rpc_task *task, void *data) |
| 51 | { |
| 52 | struct nfs_commit_data *wdata = data; |
| 53 | |
| 54 | /* Note this may cause RPC to be resent */ |
| 55 | wdata->mds_ops->rpc_call_done(task, data); |
| 56 | } |
| 57 | EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done); |
| 58 | |
| 59 | void pnfs_generic_commit_release(void *calldata) |
| 60 | { |
| 61 | struct nfs_commit_data *data = calldata; |
| 62 | |
| 63 | data->completion_ops->completion(data); |
| 64 | pnfs_put_lseg(data->lseg); |
| 65 | nfs_put_client(data->ds_clp); |
| 66 | nfs_commitdata_release(data); |
| 67 | } |
| 68 | EXPORT_SYMBOL_GPL(pnfs_generic_commit_release); |
| 69 | |
| 70 | /* The generic layer is about to remove the req from the commit list. |
| 71 | * If this will make the bucket empty, it will need to put the lseg reference. |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 72 | * Note this must be called holding the inode (/cinfo) lock |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 73 | */ |
| 74 | void |
| 75 | pnfs_generic_clear_request_commit(struct nfs_page *req, |
| 76 | struct nfs_commit_info *cinfo) |
| 77 | { |
| 78 | struct pnfs_layout_segment *freeme = NULL; |
| 79 | |
| 80 | if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags)) |
| 81 | goto out; |
| 82 | cinfo->ds->nwritten--; |
| 83 | if (list_is_singular(&req->wb_list)) { |
| 84 | struct pnfs_commit_bucket *bucket; |
| 85 | |
| 86 | bucket = list_first_entry(&req->wb_list, |
| 87 | struct pnfs_commit_bucket, |
| 88 | written); |
| 89 | freeme = bucket->wlseg; |
| 90 | bucket->wlseg = NULL; |
| 91 | } |
| 92 | out: |
| 93 | nfs_request_remove_commit_list(req, cinfo); |
| 94 | pnfs_put_lseg_locked(freeme); |
| 95 | } |
| 96 | EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); |
| 97 | |
| 98 | static int |
| 99 | pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst, |
| 100 | struct nfs_commit_info *cinfo, int max) |
| 101 | { |
| 102 | struct nfs_page *req, *tmp; |
| 103 | int ret = 0; |
| 104 | |
| 105 | list_for_each_entry_safe(req, tmp, src, wb_list) { |
| 106 | if (!nfs_lock_request(req)) |
| 107 | continue; |
| 108 | kref_get(&req->wb_kref); |
| 109 | if (cond_resched_lock(cinfo->lock)) |
| 110 | list_safe_reset_next(req, tmp, wb_list); |
| 111 | nfs_request_remove_commit_list(req, cinfo); |
| 112 | clear_bit(PG_COMMIT_TO_DS, &req->wb_flags); |
| 113 | nfs_list_add_request(req, dst); |
| 114 | ret++; |
| 115 | if ((ret == max) && !cinfo->dreq) |
| 116 | break; |
| 117 | } |
| 118 | return ret; |
| 119 | } |
| 120 | |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 121 | static int |
| 122 | pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket, |
| 123 | struct nfs_commit_info *cinfo, |
| 124 | int max) |
| 125 | { |
| 126 | struct list_head *src = &bucket->written; |
| 127 | struct list_head *dst = &bucket->committing; |
| 128 | int ret; |
| 129 | |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 130 | lockdep_assert_held(cinfo->lock); |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 131 | ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max); |
| 132 | if (ret) { |
| 133 | cinfo->ds->nwritten -= ret; |
| 134 | cinfo->ds->ncommitting += ret; |
| 135 | bucket->clseg = bucket->wlseg; |
| 136 | if (list_empty(src)) |
| 137 | bucket->wlseg = NULL; |
| 138 | else |
| 139 | pnfs_get_lseg(bucket->clseg); |
| 140 | } |
| 141 | return ret; |
| 142 | } |
| 143 | |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 144 | /* Move reqs from written to committing lists, returning count |
| 145 | * of number moved. |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 146 | */ |
| 147 | int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, |
| 148 | int max) |
| 149 | { |
| 150 | int i, rv = 0, cnt; |
| 151 | |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 152 | lockdep_assert_held(cinfo->lock); |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 153 | for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) { |
| 154 | cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i], |
| 155 | cinfo, max); |
| 156 | max -= cnt; |
| 157 | rv += cnt; |
| 158 | } |
| 159 | return rv; |
| 160 | } |
| 161 | EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists); |
| 162 | |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 163 | /* Pull everything off the committing lists and dump into @dst. */ |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 164 | void pnfs_generic_recover_commit_reqs(struct list_head *dst, |
| 165 | struct nfs_commit_info *cinfo) |
| 166 | { |
| 167 | struct pnfs_commit_bucket *b; |
| 168 | struct pnfs_layout_segment *freeme; |
| 169 | int i; |
| 170 | |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 171 | lockdep_assert_held(cinfo->lock); |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 172 | restart: |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 173 | for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { |
| 174 | if (pnfs_generic_transfer_commit_list(&b->written, dst, |
| 175 | cinfo, 0)) { |
| 176 | freeme = b->wlseg; |
| 177 | b->wlseg = NULL; |
| 178 | spin_unlock(cinfo->lock); |
| 179 | pnfs_put_lseg(freeme); |
Tom Haynes | 085d1e3 | 2014-12-11 13:04:55 -0500 | [diff] [blame] | 180 | spin_lock(cinfo->lock); |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 181 | goto restart; |
| 182 | } |
| 183 | } |
| 184 | cinfo->ds->nwritten = 0; |
Tom Haynes | f54bcf2 | 2014-12-11 15:34:59 -0500 | [diff] [blame] | 185 | } |
| 186 | EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); |
| 187 | |
| 188 | static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) |
| 189 | { |
| 190 | struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; |
| 191 | struct pnfs_commit_bucket *bucket; |
| 192 | struct pnfs_layout_segment *freeme; |
| 193 | int i; |
| 194 | |
| 195 | for (i = idx; i < fl_cinfo->nbuckets; i++) { |
| 196 | bucket = &fl_cinfo->buckets[i]; |
| 197 | if (list_empty(&bucket->committing)) |
| 198 | continue; |
| 199 | nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo); |
| 200 | spin_lock(cinfo->lock); |
| 201 | freeme = bucket->clseg; |
| 202 | bucket->clseg = NULL; |
| 203 | spin_unlock(cinfo->lock); |
| 204 | pnfs_put_lseg(freeme); |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | static unsigned int |
| 209 | pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, |
| 210 | struct list_head *list) |
| 211 | { |
| 212 | struct pnfs_ds_commit_info *fl_cinfo; |
| 213 | struct pnfs_commit_bucket *bucket; |
| 214 | struct nfs_commit_data *data; |
| 215 | int i; |
| 216 | unsigned int nreq = 0; |
| 217 | |
| 218 | fl_cinfo = cinfo->ds; |
| 219 | bucket = fl_cinfo->buckets; |
| 220 | for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { |
| 221 | if (list_empty(&bucket->committing)) |
| 222 | continue; |
| 223 | data = nfs_commitdata_alloc(); |
| 224 | if (!data) |
| 225 | break; |
| 226 | data->ds_commit_index = i; |
| 227 | spin_lock(cinfo->lock); |
| 228 | data->lseg = bucket->clseg; |
| 229 | bucket->clseg = NULL; |
| 230 | spin_unlock(cinfo->lock); |
| 231 | list_add(&data->pages, list); |
| 232 | nreq++; |
| 233 | } |
| 234 | |
| 235 | /* Clean up on error */ |
| 236 | pnfs_generic_retry_commit(cinfo, i); |
| 237 | return nreq; |
| 238 | } |
| 239 | |
| 240 | /* This follows nfs_commit_list pretty closely */ |
| 241 | int |
| 242 | pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, |
| 243 | int how, struct nfs_commit_info *cinfo, |
| 244 | int (*initiate_commit)(struct nfs_commit_data *data, |
| 245 | int how)) |
| 246 | { |
| 247 | struct nfs_commit_data *data, *tmp; |
| 248 | LIST_HEAD(list); |
| 249 | unsigned int nreq = 0; |
| 250 | |
| 251 | if (!list_empty(mds_pages)) { |
| 252 | data = nfs_commitdata_alloc(); |
| 253 | if (data != NULL) { |
| 254 | data->lseg = NULL; |
| 255 | list_add(&data->pages, &list); |
| 256 | nreq++; |
| 257 | } else { |
| 258 | nfs_retry_commit(mds_pages, NULL, cinfo); |
| 259 | pnfs_generic_retry_commit(cinfo, 0); |
| 260 | cinfo->completion_ops->error_cleanup(NFS_I(inode)); |
| 261 | return -ENOMEM; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); |
| 266 | |
| 267 | if (nreq == 0) { |
| 268 | cinfo->completion_ops->error_cleanup(NFS_I(inode)); |
| 269 | goto out; |
| 270 | } |
| 271 | |
| 272 | atomic_add(nreq, &cinfo->mds->rpcs_out); |
| 273 | |
| 274 | list_for_each_entry_safe(data, tmp, &list, pages) { |
| 275 | list_del_init(&data->pages); |
| 276 | if (!data->lseg) { |
| 277 | nfs_init_commit(data, mds_pages, NULL, cinfo); |
| 278 | nfs_initiate_commit(NFS_CLIENT(inode), data, |
| 279 | data->mds_ops, how, 0); |
| 280 | } else { |
| 281 | struct pnfs_commit_bucket *buckets; |
| 282 | |
| 283 | buckets = cinfo->ds->buckets; |
| 284 | nfs_init_commit(data, |
| 285 | &buckets[data->ds_commit_index].committing, |
| 286 | data->lseg, |
| 287 | cinfo); |
| 288 | initiate_commit(data, how); |
| 289 | } |
| 290 | } |
| 291 | out: |
| 292 | cinfo->ds->ncommitting = 0; |
| 293 | return PNFS_ATTEMPTED; |
| 294 | } |
| 295 | EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); |
Peng Tao | 875ae06 | 2014-05-29 21:06:57 +0800 | [diff] [blame] | 296 | |
| 297 | /* |
| 298 | * Data server cache |
| 299 | * |
| 300 | * Data servers can be mapped to different device ids. |
| 301 | * nfs4_pnfs_ds reference counting |
| 302 | * - set to 1 on allocation |
| 303 | * - incremented when a device id maps a data server already in the cache. |
| 304 | * - decremented when deviceid is removed from the cache. |
| 305 | */ |
| 306 | static DEFINE_SPINLOCK(nfs4_ds_cache_lock); |
| 307 | static LIST_HEAD(nfs4_data_server_cache); |
| 308 | |
| 309 | /* Debug routines */ |
| 310 | static void |
| 311 | print_ds(struct nfs4_pnfs_ds *ds) |
| 312 | { |
| 313 | if (ds == NULL) { |
| 314 | printk(KERN_WARNING "%s NULL device\n", __func__); |
| 315 | return; |
| 316 | } |
| 317 | printk(KERN_WARNING " ds %s\n" |
| 318 | " ref count %d\n" |
| 319 | " client %p\n" |
| 320 | " cl_exchange_flags %x\n", |
| 321 | ds->ds_remotestr, |
| 322 | atomic_read(&ds->ds_count), ds->ds_clp, |
| 323 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); |
| 324 | } |
| 325 | |
| 326 | static bool |
| 327 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) |
| 328 | { |
| 329 | struct sockaddr_in *a, *b; |
| 330 | struct sockaddr_in6 *a6, *b6; |
| 331 | |
| 332 | if (addr1->sa_family != addr2->sa_family) |
| 333 | return false; |
| 334 | |
| 335 | switch (addr1->sa_family) { |
| 336 | case AF_INET: |
| 337 | a = (struct sockaddr_in *)addr1; |
| 338 | b = (struct sockaddr_in *)addr2; |
| 339 | |
| 340 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && |
| 341 | a->sin_port == b->sin_port) |
| 342 | return true; |
| 343 | break; |
| 344 | |
| 345 | case AF_INET6: |
| 346 | a6 = (struct sockaddr_in6 *)addr1; |
| 347 | b6 = (struct sockaddr_in6 *)addr2; |
| 348 | |
| 349 | /* LINKLOCAL addresses must have matching scope_id */ |
| 350 | if (ipv6_addr_src_scope(&a6->sin6_addr) == |
| 351 | IPV6_ADDR_SCOPE_LINKLOCAL && |
| 352 | a6->sin6_scope_id != b6->sin6_scope_id) |
| 353 | return false; |
| 354 | |
| 355 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && |
| 356 | a6->sin6_port == b6->sin6_port) |
| 357 | return true; |
| 358 | break; |
| 359 | |
| 360 | default: |
| 361 | dprintk("%s: unhandled address family: %u\n", |
| 362 | __func__, addr1->sa_family); |
| 363 | return false; |
| 364 | } |
| 365 | |
| 366 | return false; |
| 367 | } |
| 368 | |
| 369 | static bool |
| 370 | _same_data_server_addrs_locked(const struct list_head *dsaddrs1, |
| 371 | const struct list_head *dsaddrs2) |
| 372 | { |
| 373 | struct nfs4_pnfs_ds_addr *da1, *da2; |
| 374 | |
| 375 | /* step through both lists, comparing as we go */ |
| 376 | for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node), |
| 377 | da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node); |
| 378 | da1 != NULL && da2 != NULL; |
| 379 | da1 = list_entry(da1->da_node.next, typeof(*da1), da_node), |
| 380 | da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) { |
| 381 | if (!same_sockaddr((struct sockaddr *)&da1->da_addr, |
| 382 | (struct sockaddr *)&da2->da_addr)) |
| 383 | return false; |
| 384 | } |
| 385 | if (da1 == NULL && da2 == NULL) |
| 386 | return true; |
| 387 | |
| 388 | return false; |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Lookup DS by addresses. nfs4_ds_cache_lock is held |
| 393 | */ |
| 394 | static struct nfs4_pnfs_ds * |
| 395 | _data_server_lookup_locked(const struct list_head *dsaddrs) |
| 396 | { |
| 397 | struct nfs4_pnfs_ds *ds; |
| 398 | |
| 399 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) |
| 400 | if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) |
| 401 | return ds; |
| 402 | return NULL; |
| 403 | } |
| 404 | |
| 405 | static void destroy_ds(struct nfs4_pnfs_ds *ds) |
| 406 | { |
| 407 | struct nfs4_pnfs_ds_addr *da; |
| 408 | |
| 409 | dprintk("--> %s\n", __func__); |
| 410 | ifdebug(FACILITY) |
| 411 | print_ds(ds); |
| 412 | |
| 413 | nfs_put_client(ds->ds_clp); |
| 414 | |
| 415 | while (!list_empty(&ds->ds_addrs)) { |
| 416 | da = list_first_entry(&ds->ds_addrs, |
| 417 | struct nfs4_pnfs_ds_addr, |
| 418 | da_node); |
| 419 | list_del_init(&da->da_node); |
| 420 | kfree(da->da_remotestr); |
| 421 | kfree(da); |
| 422 | } |
| 423 | |
| 424 | kfree(ds->ds_remotestr); |
| 425 | kfree(ds); |
| 426 | } |
| 427 | |
| 428 | void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) |
| 429 | { |
| 430 | if (atomic_dec_and_lock(&ds->ds_count, |
| 431 | &nfs4_ds_cache_lock)) { |
| 432 | list_del_init(&ds->ds_node); |
| 433 | spin_unlock(&nfs4_ds_cache_lock); |
| 434 | destroy_ds(ds); |
| 435 | } |
| 436 | } |
| 437 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); |
| 438 | |
| 439 | /* |
| 440 | * Create a string with a human readable address and port to avoid |
| 441 | * complicated setup around many dprinks. |
| 442 | */ |
| 443 | static char * |
| 444 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) |
| 445 | { |
| 446 | struct nfs4_pnfs_ds_addr *da; |
| 447 | char *remotestr; |
| 448 | size_t len; |
| 449 | char *p; |
| 450 | |
| 451 | len = 3; /* '{', '}' and eol */ |
| 452 | list_for_each_entry(da, dsaddrs, da_node) { |
| 453 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ |
| 454 | } |
| 455 | |
| 456 | remotestr = kzalloc(len, gfp_flags); |
| 457 | if (!remotestr) |
| 458 | return NULL; |
| 459 | |
| 460 | p = remotestr; |
| 461 | *(p++) = '{'; |
| 462 | len--; |
| 463 | list_for_each_entry(da, dsaddrs, da_node) { |
| 464 | size_t ll = strlen(da->da_remotestr); |
| 465 | |
| 466 | if (ll > len) |
| 467 | goto out_err; |
| 468 | |
| 469 | memcpy(p, da->da_remotestr, ll); |
| 470 | p += ll; |
| 471 | len -= ll; |
| 472 | |
| 473 | if (len < 1) |
| 474 | goto out_err; |
| 475 | (*p++) = ','; |
| 476 | len--; |
| 477 | } |
| 478 | if (len < 2) |
| 479 | goto out_err; |
| 480 | *(p++) = '}'; |
| 481 | *p = '\0'; |
| 482 | return remotestr; |
| 483 | out_err: |
| 484 | kfree(remotestr); |
| 485 | return NULL; |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if |
| 490 | * uncached and return cached struct nfs4_pnfs_ds. |
| 491 | */ |
| 492 | struct nfs4_pnfs_ds * |
| 493 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) |
| 494 | { |
| 495 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; |
| 496 | char *remotestr; |
| 497 | |
| 498 | if (list_empty(dsaddrs)) { |
| 499 | dprintk("%s: no addresses defined\n", __func__); |
| 500 | goto out; |
| 501 | } |
| 502 | |
| 503 | ds = kzalloc(sizeof(*ds), gfp_flags); |
| 504 | if (!ds) |
| 505 | goto out; |
| 506 | |
| 507 | /* this is only used for debugging, so it's ok if its NULL */ |
| 508 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); |
| 509 | |
| 510 | spin_lock(&nfs4_ds_cache_lock); |
| 511 | tmp_ds = _data_server_lookup_locked(dsaddrs); |
| 512 | if (tmp_ds == NULL) { |
| 513 | INIT_LIST_HEAD(&ds->ds_addrs); |
| 514 | list_splice_init(dsaddrs, &ds->ds_addrs); |
| 515 | ds->ds_remotestr = remotestr; |
| 516 | atomic_set(&ds->ds_count, 1); |
| 517 | INIT_LIST_HEAD(&ds->ds_node); |
| 518 | ds->ds_clp = NULL; |
| 519 | list_add(&ds->ds_node, &nfs4_data_server_cache); |
| 520 | dprintk("%s add new data server %s\n", __func__, |
| 521 | ds->ds_remotestr); |
| 522 | } else { |
| 523 | kfree(remotestr); |
| 524 | kfree(ds); |
| 525 | atomic_inc(&tmp_ds->ds_count); |
| 526 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", |
| 527 | __func__, tmp_ds->ds_remotestr, |
| 528 | atomic_read(&tmp_ds->ds_count)); |
| 529 | ds = tmp_ds; |
| 530 | } |
| 531 | spin_unlock(&nfs4_ds_cache_lock); |
| 532 | out: |
| 533 | return ds; |
| 534 | } |
| 535 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); |
Peng Tao | 6b7f3cf | 2014-05-29 21:06:59 +0800 | [diff] [blame^] | 536 | |
| 537 | /* |
| 538 | * Currently only supports ipv4, ipv6 and one multi-path address. |
| 539 | */ |
| 540 | struct nfs4_pnfs_ds_addr * |
| 541 | nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) |
| 542 | { |
| 543 | struct nfs4_pnfs_ds_addr *da = NULL; |
| 544 | char *buf, *portstr; |
| 545 | __be16 port; |
| 546 | int nlen, rlen; |
| 547 | int tmp[2]; |
| 548 | __be32 *p; |
| 549 | char *netid, *match_netid; |
| 550 | size_t len, match_netid_len; |
| 551 | char *startsep = ""; |
| 552 | char *endsep = ""; |
| 553 | |
| 554 | |
| 555 | /* r_netid */ |
| 556 | p = xdr_inline_decode(xdr, 4); |
| 557 | if (unlikely(!p)) |
| 558 | goto out_err; |
| 559 | nlen = be32_to_cpup(p++); |
| 560 | |
| 561 | p = xdr_inline_decode(xdr, nlen); |
| 562 | if (unlikely(!p)) |
| 563 | goto out_err; |
| 564 | |
| 565 | netid = kmalloc(nlen+1, gfp_flags); |
| 566 | if (unlikely(!netid)) |
| 567 | goto out_err; |
| 568 | |
| 569 | netid[nlen] = '\0'; |
| 570 | memcpy(netid, p, nlen); |
| 571 | |
| 572 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ |
| 573 | p = xdr_inline_decode(xdr, 4); |
| 574 | if (unlikely(!p)) |
| 575 | goto out_free_netid; |
| 576 | rlen = be32_to_cpup(p); |
| 577 | |
| 578 | p = xdr_inline_decode(xdr, rlen); |
| 579 | if (unlikely(!p)) |
| 580 | goto out_free_netid; |
| 581 | |
| 582 | /* port is ".ABC.DEF", 8 chars max */ |
| 583 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { |
| 584 | dprintk("%s: Invalid address, length %d\n", __func__, |
| 585 | rlen); |
| 586 | goto out_free_netid; |
| 587 | } |
| 588 | buf = kmalloc(rlen + 1, gfp_flags); |
| 589 | if (!buf) { |
| 590 | dprintk("%s: Not enough memory\n", __func__); |
| 591 | goto out_free_netid; |
| 592 | } |
| 593 | buf[rlen] = '\0'; |
| 594 | memcpy(buf, p, rlen); |
| 595 | |
| 596 | /* replace port '.' with '-' */ |
| 597 | portstr = strrchr(buf, '.'); |
| 598 | if (!portstr) { |
| 599 | dprintk("%s: Failed finding expected dot in port\n", |
| 600 | __func__); |
| 601 | goto out_free_buf; |
| 602 | } |
| 603 | *portstr = '-'; |
| 604 | |
| 605 | /* find '.' between address and port */ |
| 606 | portstr = strrchr(buf, '.'); |
| 607 | if (!portstr) { |
| 608 | dprintk("%s: Failed finding expected dot between address and " |
| 609 | "port\n", __func__); |
| 610 | goto out_free_buf; |
| 611 | } |
| 612 | *portstr = '\0'; |
| 613 | |
| 614 | da = kzalloc(sizeof(*da), gfp_flags); |
| 615 | if (unlikely(!da)) |
| 616 | goto out_free_buf; |
| 617 | |
| 618 | INIT_LIST_HEAD(&da->da_node); |
| 619 | |
| 620 | if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, |
| 621 | sizeof(da->da_addr))) { |
| 622 | dprintk("%s: error parsing address %s\n", __func__, buf); |
| 623 | goto out_free_da; |
| 624 | } |
| 625 | |
| 626 | portstr++; |
| 627 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); |
| 628 | port = htons((tmp[0] << 8) | (tmp[1])); |
| 629 | |
| 630 | switch (da->da_addr.ss_family) { |
| 631 | case AF_INET: |
| 632 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; |
| 633 | da->da_addrlen = sizeof(struct sockaddr_in); |
| 634 | match_netid = "tcp"; |
| 635 | match_netid_len = 3; |
| 636 | break; |
| 637 | |
| 638 | case AF_INET6: |
| 639 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; |
| 640 | da->da_addrlen = sizeof(struct sockaddr_in6); |
| 641 | match_netid = "tcp6"; |
| 642 | match_netid_len = 4; |
| 643 | startsep = "["; |
| 644 | endsep = "]"; |
| 645 | break; |
| 646 | |
| 647 | default: |
| 648 | dprintk("%s: unsupported address family: %u\n", |
| 649 | __func__, da->da_addr.ss_family); |
| 650 | goto out_free_da; |
| 651 | } |
| 652 | |
| 653 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { |
| 654 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", |
| 655 | __func__, netid, match_netid); |
| 656 | goto out_free_da; |
| 657 | } |
| 658 | |
| 659 | /* save human readable address */ |
| 660 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; |
| 661 | da->da_remotestr = kzalloc(len, gfp_flags); |
| 662 | |
| 663 | /* NULL is ok, only used for dprintk */ |
| 664 | if (da->da_remotestr) |
| 665 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, |
| 666 | buf, endsep, ntohs(port)); |
| 667 | |
| 668 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); |
| 669 | kfree(buf); |
| 670 | kfree(netid); |
| 671 | return da; |
| 672 | |
| 673 | out_free_da: |
| 674 | kfree(da); |
| 675 | out_free_buf: |
| 676 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); |
| 677 | kfree(buf); |
| 678 | out_free_netid: |
| 679 | kfree(netid); |
| 680 | out_err: |
| 681 | return NULL; |
| 682 | } |
| 683 | EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); |