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9#include <linux/nfs_fs.h>
10#include <linux/vmalloc.h>
11#include <linux/module.h>
12#include <linux/sunrpc/addr.h>
13
14#include "../internal.h"
15#include "../nfs4session.h"
16#include "flexfilelayout.h"
17
18#define NFSDBG_FACILITY NFSDBG_PNFS_LD
19
20static unsigned int dataserver_timeo = NFS_DEF_TCP_RETRANS;
21static unsigned int dataserver_retrans;
22
23void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
24{
25 if (mirror_ds)
26 nfs4_put_deviceid_node(&mirror_ds->id_node);
27}
28
29void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
30{
31 nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
32 nfs4_pnfs_ds_put(mirror_ds->ds);
33 kfree_rcu(mirror_ds, id_node.rcu);
34}
35
36
37struct nfs4_ff_layout_ds *
38nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
39 gfp_t gfp_flags)
40{
41 struct xdr_stream stream;
42 struct xdr_buf buf;
43 struct page *scratch;
44 struct list_head dsaddrs;
45 struct nfs4_pnfs_ds_addr *da;
46 struct nfs4_ff_layout_ds *new_ds = NULL;
47 struct nfs4_ff_ds_version *ds_versions = NULL;
48 u32 mp_count;
49 u32 version_count;
50 __be32 *p;
51 int i, ret = -ENOMEM;
52
53
54 scratch = alloc_page(gfp_flags);
55 if (!scratch)
56 goto out_err;
57
58 new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
59 if (!new_ds)
60 goto out_scratch;
61
62 nfs4_init_deviceid_node(&new_ds->id_node,
63 server,
64 &pdev->dev_id);
65 INIT_LIST_HEAD(&dsaddrs);
66
67 xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
68 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
69
70
71 p = xdr_inline_decode(&stream, 4);
72 if (unlikely(!p))
73 goto out_err_drain_dsaddrs;
74 mp_count = be32_to_cpup(p);
75 dprintk("%s: multipath ds count %d\n", __func__, mp_count);
76
77 for (i = 0; i < mp_count; i++) {
78
79 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
80 &stream, gfp_flags);
81 if (da)
82 list_add_tail(&da->da_node, &dsaddrs);
83 }
84 if (list_empty(&dsaddrs)) {
85 dprintk("%s: no suitable DS addresses found\n",
86 __func__);
87 ret = -ENOMEDIUM;
88 goto out_err_drain_dsaddrs;
89 }
90
91
92 p = xdr_inline_decode(&stream, 4);
93 if (unlikely(!p))
94 goto out_err_drain_dsaddrs;
95 version_count = be32_to_cpup(p);
96 dprintk("%s: version count %d\n", __func__, version_count);
97
98 ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),
99 gfp_flags);
100 if (!ds_versions)
101 goto out_scratch;
102
103 for (i = 0; i < version_count; i++) {
104
105
106 p = xdr_inline_decode(&stream, 20);
107 if (unlikely(!p))
108 goto out_err_drain_dsaddrs;
109 ds_versions[i].version = be32_to_cpup(p++);
110 ds_versions[i].minor_version = be32_to_cpup(p++);
111 ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
112 ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
113 ds_versions[i].tightly_coupled = be32_to_cpup(p);
114
115 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
116 ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
117 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
118 ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
119
120 if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) {
121 dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
122 i, ds_versions[i].version,
123 ds_versions[i].minor_version);
124 ret = -EPROTONOSUPPORT;
125 goto out_err_drain_dsaddrs;
126 }
127
128 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
129 __func__, i, ds_versions[i].version,
130 ds_versions[i].minor_version,
131 ds_versions[i].rsize,
132 ds_versions[i].wsize,
133 ds_versions[i].tightly_coupled);
134 }
135
136 new_ds->ds_versions = ds_versions;
137 new_ds->ds_versions_cnt = version_count;
138
139 new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
140 if (!new_ds->ds)
141 goto out_err_drain_dsaddrs;
142
143
144 while (!list_empty(&dsaddrs)) {
145 da = list_first_entry(&dsaddrs,
146 struct nfs4_pnfs_ds_addr,
147 da_node);
148 list_del_init(&da->da_node);
149 kfree(da->da_remotestr);
150 kfree(da);
151 }
152
153 __free_page(scratch);
154 return new_ds;
155
156out_err_drain_dsaddrs:
157 while (!list_empty(&dsaddrs)) {
158 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
159 da_node);
160 list_del_init(&da->da_node);
161 kfree(da->da_remotestr);
162 kfree(da);
163 }
164
165 kfree(ds_versions);
166out_scratch:
167 __free_page(scratch);
168out_err:
169 kfree(new_ds);
170
171 dprintk("%s ERROR: returning %d\n", __func__, ret);
172 return NULL;
173}
174
175static void ff_layout_mark_devid_invalid(struct pnfs_layout_segment *lseg,
176 struct nfs4_deviceid_node *devid)
177{
178 nfs4_mark_deviceid_unavailable(devid);
179 if (!ff_layout_has_available_ds(lseg))
180 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
181 lseg);
182}
183
184static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
185 struct nfs4_ff_layout_mirror *mirror)
186{
187 if (mirror == NULL || mirror->mirror_ds == NULL) {
188 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
189 lseg);
190 return false;
191 }
192 if (mirror->mirror_ds->ds == NULL) {
193 struct nfs4_deviceid_node *devid;
194 devid = &mirror->mirror_ds->id_node;
195 ff_layout_mark_devid_invalid(lseg, devid);
196 return false;
197 }
198 return true;
199}
200
201static u64
202end_offset(u64 start, u64 len)
203{
204 u64 end;
205
206 end = start + len;
207 return end >= start ? end : NFS4_MAX_UINT64;
208}
209
210static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
211 u64 offset, u64 length)
212{
213 u64 end;
214
215 end = max_t(u64, end_offset(err->offset, err->length),
216 end_offset(offset, length));
217 err->offset = min_t(u64, err->offset, offset);
218 err->length = end - err->offset;
219}
220
221static int
222ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
223 const struct nfs4_ff_layout_ds_err *e2)
224{
225 int ret;
226
227 if (e1->opnum != e2->opnum)
228 return e1->opnum < e2->opnum ? -1 : 1;
229 if (e1->status != e2->status)
230 return e1->status < e2->status ? -1 : 1;
231 ret = memcmp(e1->stateid.data, e2->stateid.data,
232 sizeof(e1->stateid.data));
233 if (ret != 0)
234 return ret;
235 ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
236 if (ret != 0)
237 return ret;
238 if (end_offset(e1->offset, e1->length) < e2->offset)
239 return -1;
240 if (e1->offset > end_offset(e2->offset, e2->length))
241 return 1;
242
243 return 0;
244}
245
246static void
247ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
248 struct nfs4_ff_layout_ds_err *dserr)
249{
250 struct nfs4_ff_layout_ds_err *err, *tmp;
251 struct list_head *head = &flo->error_list;
252 int match;
253
254
255 list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
256 match = ff_ds_error_match(err, dserr);
257 if (match < 0)
258 continue;
259 if (match > 0) {
260
261 head = &err->list;
262 break;
263 }
264
265 extend_ds_error(dserr, err->offset, err->length);
266 list_del(&err->list);
267 kfree(err);
268 }
269
270 list_add_tail(&dserr->list, head);
271}
272
273int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
274 struct nfs4_ff_layout_mirror *mirror, u64 offset,
275 u64 length, int status, enum nfs_opnum4 opnum,
276 gfp_t gfp_flags)
277{
278 struct nfs4_ff_layout_ds_err *dserr;
279
280 if (status == 0)
281 return 0;
282
283 if (mirror->mirror_ds == NULL)
284 return -EINVAL;
285
286 dserr = kmalloc(sizeof(*dserr), gfp_flags);
287 if (!dserr)
288 return -ENOMEM;
289
290 INIT_LIST_HEAD(&dserr->list);
291 dserr->offset = offset;
292 dserr->length = length;
293 dserr->status = status;
294 dserr->opnum = opnum;
295 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
296 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
297 NFS4_DEVICEID4_SIZE);
298
299 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
300 ff_layout_add_ds_error_locked(flo, dserr);
301 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
302
303 return 0;
304}
305
306static struct rpc_cred *
307ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
308{
309 struct rpc_cred *cred, __rcu **pcred;
310
311 if (iomode == IOMODE_READ)
312 pcred = &mirror->ro_cred;
313 else
314 pcred = &mirror->rw_cred;
315
316 rcu_read_lock();
317 do {
318 cred = rcu_dereference(*pcred);
319 if (!cred)
320 break;
321
322 cred = get_rpccred_rcu(cred);
323 } while(!cred);
324 rcu_read_unlock();
325 return cred;
326}
327
328struct nfs_fh *
329nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
330{
331 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
332 struct nfs_fh *fh = NULL;
333
334 if (!ff_layout_mirror_valid(lseg, mirror)) {
335 pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
336 __func__, mirror_idx);
337 goto out;
338 }
339
340
341 fh = &mirror->fh_versions[0];
342out:
343 return fh;
344}
345
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361
362
363struct nfs4_pnfs_ds *
364nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
365 bool fail_return)
366{
367 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
368 struct nfs4_pnfs_ds *ds = NULL;
369 struct nfs4_deviceid_node *devid;
370 struct inode *ino = lseg->pls_layout->plh_inode;
371 struct nfs_server *s = NFS_SERVER(ino);
372 unsigned int max_payload;
373
374 if (!ff_layout_mirror_valid(lseg, mirror)) {
375 pr_err_ratelimited("NFS: %s: No data server for offset index %d\n",
376 __func__, ds_idx);
377 goto out;
378 }
379
380 devid = &mirror->mirror_ds->id_node;
381 if (ff_layout_test_devid_unavailable(devid))
382 goto out_fail;
383
384 ds = mirror->mirror_ds->ds;
385
386 smp_rmb();
387 if (ds->ds_clp)
388 goto out;
389
390
391
392
393 nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
394 dataserver_retrans,
395 mirror->mirror_ds->ds_versions[0].version,
396 mirror->mirror_ds->ds_versions[0].minor_version,
397 RPC_AUTH_UNIX);
398
399
400 if (ds->ds_clp) {
401 max_payload =
402 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
403 NULL);
404 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
405 mirror->mirror_ds->ds_versions[0].rsize = max_payload;
406 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
407 mirror->mirror_ds->ds_versions[0].wsize = max_payload;
408 goto out;
409 }
410 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
411 mirror, lseg->pls_range.offset,
412 lseg->pls_range.length, NFS4ERR_NXIO,
413 OP_ILLEGAL, GFP_NOIO);
414out_fail:
415 if (fail_return || !ff_layout_has_available_ds(lseg))
416 pnfs_error_mark_layout_for_return(ino, lseg);
417 ds = NULL;
418out:
419 return ds;
420}
421
422struct rpc_cred *
423ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
424 struct rpc_cred *mdscred)
425{
426 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
427 struct rpc_cred *cred;
428
429 if (mirror) {
430 cred = ff_layout_get_mirror_cred(mirror, lseg->pls_range.iomode);
431 if (!cred)
432 cred = get_rpccred(mdscred);
433 } else {
434 cred = get_rpccred(mdscred);
435 }
436 return cred;
437}
438
439
440
441
442
443struct rpc_clnt *
444nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
445 struct nfs_client *ds_clp, struct inode *inode)
446{
447 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
448
449 switch (mirror->mirror_ds->ds_versions[0].version) {
450 case 3:
451
452 return ds_clp->cl_rpcclient;
453 case 4:
454 return nfs4_find_or_create_ds_client(ds_clp, inode);
455 default:
456 BUG();
457 }
458}
459
460static bool is_range_intersecting(u64 offset1, u64 length1,
461 u64 offset2, u64 length2)
462{
463 u64 end1 = end_offset(offset1, length1);
464 u64 end2 = end_offset(offset2, length2);
465
466 return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
467 (end2 == NFS4_MAX_UINT64 || end2 > offset1);
468}
469
470
471int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
472 struct xdr_stream *xdr, int *count,
473 const struct pnfs_layout_range *range)
474{
475 struct nfs4_ff_layout_ds_err *err, *n;
476 __be32 *p;
477
478 list_for_each_entry_safe(err, n, &flo->error_list, list) {
479 if (!is_range_intersecting(err->offset, err->length,
480 range->offset, range->length))
481 continue;
482
483
484
485
486 p = xdr_reserve_space(xdr,
487 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
488 if (unlikely(!p))
489 return -ENOBUFS;
490 p = xdr_encode_hyper(p, err->offset);
491 p = xdr_encode_hyper(p, err->length);
492 p = xdr_encode_opaque_fixed(p, &err->stateid,
493 NFS4_STATEID_SIZE);
494
495 *p++ = cpu_to_be32(1);
496 p = xdr_encode_opaque_fixed(p, &err->deviceid,
497 NFS4_DEVICEID4_SIZE);
498 *p++ = cpu_to_be32(err->status);
499 *p++ = cpu_to_be32(err->opnum);
500 *count += 1;
501 list_del(&err->list);
502 dprintk("%s: offset %llu length %llu status %d op %d count %d\n",
503 __func__, err->offset, err->length, err->status,
504 err->opnum, *count);
505 kfree(err);
506 }
507
508 return 0;
509}
510
511static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
512{
513 struct nfs4_ff_layout_mirror *mirror;
514 struct nfs4_deviceid_node *devid;
515 u32 idx;
516
517 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
518 mirror = FF_LAYOUT_COMP(lseg, idx);
519 if (mirror && mirror->mirror_ds) {
520 devid = &mirror->mirror_ds->id_node;
521 if (!ff_layout_test_devid_unavailable(devid))
522 return true;
523 }
524 }
525
526 return false;
527}
528
529static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
530{
531 struct nfs4_ff_layout_mirror *mirror;
532 struct nfs4_deviceid_node *devid;
533 u32 idx;
534
535 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
536 mirror = FF_LAYOUT_COMP(lseg, idx);
537 if (!mirror || !mirror->mirror_ds)
538 return false;
539 devid = &mirror->mirror_ds->id_node;
540 if (ff_layout_test_devid_unavailable(devid))
541 return false;
542 }
543
544 return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
545}
546
547bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
548{
549 if (lseg->pls_range.iomode == IOMODE_READ)
550 return ff_read_layout_has_available_ds(lseg);
551
552 return ff_rw_layout_has_available_ds(lseg);
553}
554
555bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg)
556{
557 return ff_layout_no_fallback_to_mds(lseg) ||
558 ff_layout_has_available_ds(lseg);
559}
560
561bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg)
562{
563 return lseg->pls_range.iomode == IOMODE_RW &&
564 ff_layout_no_read_on_rw(lseg);
565}
566
567module_param(dataserver_retrans, uint, 0644);
568MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
569 "retries a request before it attempts further "
570 " recovery action.");
571module_param(dataserver_timeo, uint, 0644);
572MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
573 "NFSv4.1 client waits for a response from a "
574 " data server before it retries an NFS request.");
575
