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1/*
2 * Device operations for the pnfs nfs4 file layout driver.
3 *
4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
5 *
6 * Tao Peng <bergwolf@primarydata.com>
7 */
8
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 = NFS4_DEF_DS_TIMEO;
21static unsigned int dataserver_retrans = NFS4_DEF_DS_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/* Decode opaque device data and construct new_ds using it */
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 /* set up xdr stream */
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 /* multipath count */
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 /* multipath ds */
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 /* version count */
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 /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
105 * tightly_coupled(4) */
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 /* If DS was already in cache, free ds addrs */
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, &e2->stateid, sizeof(e1->stateid));
232 if (ret != 0)
233 return ret;
234 ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
235 if (ret != 0)
236 return ret;
237 if (end_offset(e1->offset, e1->length) < e2->offset)
238 return -1;
239 if (e1->offset > end_offset(e2->offset, e2->length))
240 return 1;
241 /* If ranges overlap or are contiguous, they are the same */
242 return 0;
243}
244
245static void
246ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
247 struct nfs4_ff_layout_ds_err *dserr)
248{
249 struct nfs4_ff_layout_ds_err *err, *tmp;
250 struct list_head *head = &flo->error_list;
251 int match;
252
253 /* Do insertion sort w/ merges */
254 list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
255 match = ff_ds_error_match(err, dserr);
256 if (match < 0)
257 continue;
258 if (match > 0) {
259 /* Add entry "dserr" _before_ entry "err" */
260 head = &err->list;
261 break;
262 }
263 /* Entries match, so merge "err" into "dserr" */
264 extend_ds_error(dserr, err->offset, err->length);
265 list_del(&err->list);
266 kfree(err);
267 }
268
269 list_add_tail(&dserr->list, head);
270}
271
272int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
273 struct nfs4_ff_layout_mirror *mirror, u64 offset,
274 u64 length, int status, enum nfs_opnum4 opnum,
275 gfp_t gfp_flags)
276{
277 struct nfs4_ff_layout_ds_err *dserr;
278
279 if (status == 0)
280 return 0;
281
282 if (mirror->mirror_ds == NULL)
283 return -EINVAL;
284
285 dserr = kmalloc(sizeof(*dserr), gfp_flags);
286 if (!dserr)
287 return -ENOMEM;
288
289 INIT_LIST_HEAD(&dserr->list);
290 dserr->offset = offset;
291 dserr->length = length;
292 dserr->status = status;
293 dserr->opnum = opnum;
294 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
295 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
296 NFS4_DEVICEID4_SIZE);
297
298 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
299 ff_layout_add_ds_error_locked(flo, dserr);
300 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
301
302 return 0;
303}
304
305/* currently we only support AUTH_NONE and AUTH_SYS */
306static rpc_authflavor_t
307nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror)
308{
309 if (mirror->uid == (u32)-1)
310 return RPC_AUTH_NULL;
311 return RPC_AUTH_UNIX;
312}
313
314/* fetch cred for NFSv3 DS */
315static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror,
316 struct nfs4_pnfs_ds *ds)
317{
318 if (ds->ds_clp && !mirror->cred &&
319 mirror->mirror_ds->ds_versions[0].version == 3) {
320 struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth;
321 struct rpc_cred *cred;
322 struct auth_cred acred = {
323 .uid = make_kuid(&init_user_ns, mirror->uid),
324 .gid = make_kgid(&init_user_ns, mirror->gid),
325 };
326
327 /* AUTH_NULL ignores acred */
328 cred = auth->au_ops->lookup_cred(auth, &acred, 0);
329 if (IS_ERR(cred)) {
330 dprintk("%s: lookup_cred failed with %ld\n",
331 __func__, PTR_ERR(cred));
332 return PTR_ERR(cred);
333 } else {
334 if (cmpxchg(&mirror->cred, NULL, cred))
335 put_rpccred(cred);
336 }
337 }
338 return 0;
339}
340
341struct nfs_fh *
342nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
343{
344 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
345 struct nfs_fh *fh = NULL;
346
347 if (!ff_layout_mirror_valid(lseg, mirror)) {
348 pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
349 __func__, mirror_idx);
350 goto out;
351 }
352
353 /* FIXME: For now assume there is only 1 version available for the DS */
354 fh = &mirror->fh_versions[0];
355out:
356 return fh;
357}
358
359/* Upon return, either ds is connected, or ds is NULL */
360struct nfs4_pnfs_ds *
361nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
362 bool fail_return)
363{
364 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
365 struct nfs4_pnfs_ds *ds = NULL;
366 struct nfs4_deviceid_node *devid;
367 struct inode *ino = lseg->pls_layout->plh_inode;
368 struct nfs_server *s = NFS_SERVER(ino);
369 unsigned int max_payload;
370 rpc_authflavor_t flavor;
371
372 if (!ff_layout_mirror_valid(lseg, mirror)) {
373 pr_err_ratelimited("NFS: %s: No data server for offset index %d\n",
374 __func__, ds_idx);
375 goto out;
376 }
377
378 devid = &mirror->mirror_ds->id_node;
379 if (ff_layout_test_devid_unavailable(devid))
380 goto out;
381
382 ds = mirror->mirror_ds->ds;
383 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
384 smp_rmb();
385 if (ds->ds_clp)
386 goto out_update_creds;
387
388 flavor = nfs4_ff_layout_choose_authflavor(mirror);
389
390 /* FIXME: For now we assume the server sent only one version of NFS
391 * to use for the DS.
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 flavor);
398
399 /* connect success, check rsize/wsize limit */
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 } else {
409 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
410 mirror, lseg->pls_range.offset,
411 lseg->pls_range.length, NFS4ERR_NXIO,
412 OP_ILLEGAL, GFP_NOIO);
413 if (!fail_return) {
414 if (ff_layout_has_available_ds(lseg))
415 set_bit(NFS_LAYOUT_RETURN_REQUESTED,
416 &lseg->pls_layout->plh_flags);
417 else
418 pnfs_error_mark_layout_for_return(ino, lseg);
419 } else
420 pnfs_error_mark_layout_for_return(ino, lseg);
421 ds = NULL;
422 goto out;
423 }
424out_update_creds:
425 if (ff_layout_update_mirror_cred(mirror, ds))
426 ds = NULL;
427out:
428 return ds;
429}
430
431struct rpc_cred *
432ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
433 struct rpc_cred *mdscred)
434{
435 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
436 struct rpc_cred *cred = ERR_PTR(-EINVAL);
437
438 if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true))
439 goto out;
440
441 if (mirror && mirror->cred)
442 cred = mirror->cred;
443 else
444 cred = mdscred;
445out:
446 return cred;
447}
448
449/**
450* Find or create a DS rpc client with th MDS server rpc client auth flavor
451* in the nfs_client cl_ds_clients list.
452*/
453struct rpc_clnt *
454nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
455 struct nfs_client *ds_clp, struct inode *inode)
456{
457 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
458
459 switch (mirror->mirror_ds->ds_versions[0].version) {
460 case 3:
461 /* For NFSv3 DS, flavor is set when creating DS connections */
462 return ds_clp->cl_rpcclient;
463 case 4:
464 return nfs4_find_or_create_ds_client(ds_clp, inode);
465 default:
466 BUG();
467 }
468}
469
470static bool is_range_intersecting(u64 offset1, u64 length1,
471 u64 offset2, u64 length2)
472{
473 u64 end1 = end_offset(offset1, length1);
474 u64 end2 = end_offset(offset2, length2);
475
476 return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
477 (end2 == NFS4_MAX_UINT64 || end2 > offset1);
478}
479
480/* called with inode i_lock held */
481int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
482 struct xdr_stream *xdr, int *count,
483 const struct pnfs_layout_range *range)
484{
485 struct nfs4_ff_layout_ds_err *err, *n;
486 __be32 *p;
487
488 list_for_each_entry_safe(err, n, &flo->error_list, list) {
489 if (!is_range_intersecting(err->offset, err->length,
490 range->offset, range->length))
491 continue;
492 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
493 * + array length + deviceid(NFS4_DEVICEID4_SIZE)
494 * + status(4) + opnum(4)
495 */
496 p = xdr_reserve_space(xdr,
497 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
498 if (unlikely(!p))
499 return -ENOBUFS;
500 p = xdr_encode_hyper(p, err->offset);
501 p = xdr_encode_hyper(p, err->length);
502 p = xdr_encode_opaque_fixed(p, &err->stateid,
503 NFS4_STATEID_SIZE);
504 /* Encode 1 error */
505 *p++ = cpu_to_be32(1);
506 p = xdr_encode_opaque_fixed(p, &err->deviceid,
507 NFS4_DEVICEID4_SIZE);
508 *p++ = cpu_to_be32(err->status);
509 *p++ = cpu_to_be32(err->opnum);
510 *count += 1;
511 list_del(&err->list);
512 dprintk("%s: offset %llu length %llu status %d op %d count %d\n",
513 __func__, err->offset, err->length, err->status,
514 err->opnum, *count);
515 kfree(err);
516 }
517
518 return 0;
519}
520
521static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
522{
523 struct nfs4_ff_layout_mirror *mirror;
524 struct nfs4_deviceid_node *devid;
525 u32 idx;
526
527 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
528 mirror = FF_LAYOUT_COMP(lseg, idx);
529 if (mirror && mirror->mirror_ds) {
530 devid = &mirror->mirror_ds->id_node;
531 if (!ff_layout_test_devid_unavailable(devid))
532 return true;
533 }
534 }
535
536 return false;
537}
538
539static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
540{
541 struct nfs4_ff_layout_mirror *mirror;
542 struct nfs4_deviceid_node *devid;
543 u32 idx;
544
545 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
546 mirror = FF_LAYOUT_COMP(lseg, idx);
547 if (!mirror || !mirror->mirror_ds)
548 return false;
549 devid = &mirror->mirror_ds->id_node;
550 if (ff_layout_test_devid_unavailable(devid))
551 return false;
552 }
553
554 return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
555}
556
557bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
558{
559 if (lseg->pls_range.iomode == IOMODE_READ)
560 return ff_read_layout_has_available_ds(lseg);
561 /* Note: RW layout needs all mirrors available */
562 return ff_rw_layout_has_available_ds(lseg);
563}
564
565module_param(dataserver_retrans, uint, 0644);
566MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
567 "retries a request before it attempts further "
568 " recovery action.");
569module_param(dataserver_timeo, uint, 0644);
570MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
571 "NFSv4.1 client waits for a response from a "
572 " data server before it retries an NFS request.");