Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Device operations for the pnfs nfs4 file layout driver.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tao Peng <bergwolf@primarydata.com>
8 */
9
10#include <linux/nfs_fs.h>
11#include <linux/vmalloc.h>
12#include <linux/module.h>
13#include <linux/sunrpc/addr.h>
14
15#include "../internal.h"
16#include "../nfs4session.h"
17#include "flexfilelayout.h"
18
19#define NFSDBG_FACILITY NFSDBG_PNFS_LD
20
21static unsigned int dataserver_timeo = NFS_DEF_TCP_TIMEO;
22static unsigned int dataserver_retrans;
23
24static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
25
26void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
27{
28 if (!IS_ERR_OR_NULL(mirror_ds))
29 nfs4_put_deviceid_node(&mirror_ds->id_node);
30}
31
32void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
33{
34 nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
35 nfs4_pnfs_ds_put(mirror_ds->ds);
36 kfree(mirror_ds->ds_versions);
37 kfree_rcu(mirror_ds, id_node.rcu);
38}
39
40/* Decode opaque device data and construct new_ds using it */
41struct nfs4_ff_layout_ds *
42nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
43 gfp_t gfp_flags)
44{
45 struct xdr_stream stream;
46 struct xdr_buf buf;
47 struct page *scratch;
48 struct list_head dsaddrs;
49 struct nfs4_pnfs_ds_addr *da;
50 struct nfs4_ff_layout_ds *new_ds = NULL;
51 struct nfs4_ff_ds_version *ds_versions = NULL;
52 u32 mp_count;
53 u32 version_count;
54 __be32 *p;
55 int i, ret = -ENOMEM;
56
57 /* set up xdr stream */
58 scratch = alloc_page(gfp_flags);
59 if (!scratch)
60 goto out_err;
61
62 new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
63 if (!new_ds)
64 goto out_scratch;
65
66 nfs4_init_deviceid_node(&new_ds->id_node,
67 server,
68 &pdev->dev_id);
69 INIT_LIST_HEAD(&dsaddrs);
70
71 xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
72 xdr_set_scratch_page(&stream, scratch);
73
74 /* multipath count */
75 p = xdr_inline_decode(&stream, 4);
76 if (unlikely(!p))
77 goto out_err_drain_dsaddrs;
78 mp_count = be32_to_cpup(p);
79 dprintk("%s: multipath ds count %d\n", __func__, mp_count);
80
81 for (i = 0; i < mp_count; i++) {
82 /* multipath ds */
83 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
84 &stream, gfp_flags);
85 if (da)
86 list_add_tail(&da->da_node, &dsaddrs);
87 }
88 if (list_empty(&dsaddrs)) {
89 dprintk("%s: no suitable DS addresses found\n",
90 __func__);
91 ret = -ENOMEDIUM;
92 goto out_err_drain_dsaddrs;
93 }
94
95 /* version count */
96 p = xdr_inline_decode(&stream, 4);
97 if (unlikely(!p))
98 goto out_err_drain_dsaddrs;
99 version_count = be32_to_cpup(p);
100 dprintk("%s: version count %d\n", __func__, version_count);
101
102 ds_versions = kcalloc(version_count,
103 sizeof(struct nfs4_ff_ds_version),
104 gfp_flags);
105 if (!ds_versions)
106 goto out_scratch;
107
108 for (i = 0; i < version_count; i++) {
109 /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
110 * tightly_coupled(4) */
111 p = xdr_inline_decode(&stream, 20);
112 if (unlikely(!p))
113 goto out_err_drain_dsaddrs;
114 ds_versions[i].version = be32_to_cpup(p++);
115 ds_versions[i].minor_version = be32_to_cpup(p++);
116 ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
117 ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
118 ds_versions[i].tightly_coupled = be32_to_cpup(p);
119
120 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
121 ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
122 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
123 ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
124
125 /*
126 * check for valid major/minor combination.
127 * currently we support dataserver which talk:
128 * v3, v4.0, v4.1, v4.2
129 */
130 if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||
131 (ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {
132 dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
133 i, ds_versions[i].version,
134 ds_versions[i].minor_version);
135 ret = -EPROTONOSUPPORT;
136 goto out_err_drain_dsaddrs;
137 }
138
139 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
140 __func__, i, ds_versions[i].version,
141 ds_versions[i].minor_version,
142 ds_versions[i].rsize,
143 ds_versions[i].wsize,
144 ds_versions[i].tightly_coupled);
145 }
146
147 new_ds->ds_versions = ds_versions;
148 new_ds->ds_versions_cnt = version_count;
149
150 new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
151 if (!new_ds->ds)
152 goto out_err_drain_dsaddrs;
153
154 /* If DS was already in cache, free ds addrs */
155 while (!list_empty(&dsaddrs)) {
156 da = list_first_entry(&dsaddrs,
157 struct nfs4_pnfs_ds_addr,
158 da_node);
159 list_del_init(&da->da_node);
160 kfree(da->da_remotestr);
161 kfree(da);
162 }
163
164 __free_page(scratch);
165 return new_ds;
166
167out_err_drain_dsaddrs:
168 while (!list_empty(&dsaddrs)) {
169 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
170 da_node);
171 list_del_init(&da->da_node);
172 kfree(da->da_remotestr);
173 kfree(da);
174 }
175
176 kfree(ds_versions);
177out_scratch:
178 __free_page(scratch);
179out_err:
180 kfree(new_ds);
181
182 dprintk("%s ERROR: returning %d\n", __func__, ret);
183 return NULL;
184}
185
186static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
187 u64 offset, u64 length)
188{
189 u64 end;
190
191 end = max_t(u64, pnfs_end_offset(err->offset, err->length),
192 pnfs_end_offset(offset, length));
193 err->offset = min_t(u64, err->offset, offset);
194 err->length = end - err->offset;
195}
196
197static int
198ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
199 const struct nfs4_ff_layout_ds_err *e2)
200{
201 int ret;
202
203 if (e1->opnum != e2->opnum)
204 return e1->opnum < e2->opnum ? -1 : 1;
205 if (e1->status != e2->status)
206 return e1->status < e2->status ? -1 : 1;
207 ret = memcmp(e1->stateid.data, e2->stateid.data,
208 sizeof(e1->stateid.data));
209 if (ret != 0)
210 return ret;
211 ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
212 if (ret != 0)
213 return ret;
214 if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)
215 return -1;
216 if (e1->offset > pnfs_end_offset(e2->offset, e2->length))
217 return 1;
218 /* If ranges overlap or are contiguous, they are the same */
219 return 0;
220}
221
222static void
223ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
224 struct nfs4_ff_layout_ds_err *dserr)
225{
226 struct nfs4_ff_layout_ds_err *err, *tmp;
227 struct list_head *head = &flo->error_list;
228 int match;
229
230 /* Do insertion sort w/ merges */
231 list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
232 match = ff_ds_error_match(err, dserr);
233 if (match < 0)
234 continue;
235 if (match > 0) {
236 /* Add entry "dserr" _before_ entry "err" */
237 head = &err->list;
238 break;
239 }
240 /* Entries match, so merge "err" into "dserr" */
241 extend_ds_error(dserr, err->offset, err->length);
242 list_replace(&err->list, &dserr->list);
243 kfree(err);
244 return;
245 }
246
247 list_add_tail(&dserr->list, head);
248}
249
250int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
251 struct nfs4_ff_layout_mirror *mirror, u64 offset,
252 u64 length, int status, enum nfs_opnum4 opnum,
253 gfp_t gfp_flags)
254{
255 struct nfs4_ff_layout_ds_err *dserr;
256
257 if (status == 0)
258 return 0;
259
260 if (IS_ERR_OR_NULL(mirror->mirror_ds))
261 return -EINVAL;
262
263 dserr = kmalloc(sizeof(*dserr), gfp_flags);
264 if (!dserr)
265 return -ENOMEM;
266
267 INIT_LIST_HEAD(&dserr->list);
268 dserr->offset = offset;
269 dserr->length = length;
270 dserr->status = status;
271 dserr->opnum = opnum;
272 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
273 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
274 NFS4_DEVICEID4_SIZE);
275
276 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
277 ff_layout_add_ds_error_locked(flo, dserr);
278 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
279 return 0;
280}
281
282static const struct cred *
283ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
284{
285 const struct cred *cred, __rcu **pcred;
286
287 if (iomode == IOMODE_READ)
288 pcred = &mirror->ro_cred;
289 else
290 pcred = &mirror->rw_cred;
291
292 rcu_read_lock();
293 do {
294 cred = rcu_dereference(*pcred);
295 if (!cred)
296 break;
297
298 cred = get_cred_rcu(cred);
299 } while(!cred);
300 rcu_read_unlock();
301 return cred;
302}
303
304struct nfs_fh *
305nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror)
306{
307 /* FIXME: For now assume there is only 1 version available for the DS */
308 return &mirror->fh_versions[0];
309}
310
311void
312nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
313 nfs4_stateid *stateid)
314{
315 if (nfs4_ff_layout_ds_version(mirror) == 4)
316 nfs4_stateid_copy(stateid, &mirror->stateid);
317}
318
319static bool
320ff_layout_init_mirror_ds(struct pnfs_layout_hdr *lo,
321 struct nfs4_ff_layout_mirror *mirror)
322{
323 if (mirror == NULL)
324 goto outerr;
325 if (mirror->mirror_ds == NULL) {
326 struct nfs4_deviceid_node *node;
327 struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
328
329 node = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode),
330 &mirror->devid, lo->plh_lc_cred,
331 GFP_KERNEL);
332 if (node)
333 mirror_ds = FF_LAYOUT_MIRROR_DS(node);
334
335 /* check for race with another call to this function */
336 if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
337 mirror_ds != ERR_PTR(-ENODEV))
338 nfs4_put_deviceid_node(node);
339 }
340
341 if (IS_ERR(mirror->mirror_ds))
342 goto outerr;
343
344 return true;
345outerr:
346 return false;
347}
348
349/**
350 * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
351 * @lseg: the layout segment we're operating on
352 * @mirror: layout mirror describing the DS to use
353 * @fail_return: return layout on connect failure?
354 *
355 * Try to prepare a DS connection to accept an RPC call. This involves
356 * selecting a mirror to use and connecting the client to it if it's not
357 * already connected.
358 *
359 * Since we only need a single functioning mirror to satisfy a read, we don't
360 * want to return the layout if there is one. For writes though, any down
361 * mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish
362 * between the two cases.
363 *
364 * Returns a pointer to a connected DS object on success or NULL on failure.
365 */
366struct nfs4_pnfs_ds *
367nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
368 struct nfs4_ff_layout_mirror *mirror,
369 bool fail_return)
370{
371 struct nfs4_pnfs_ds *ds = NULL;
372 struct inode *ino = lseg->pls_layout->plh_inode;
373 struct nfs_server *s = NFS_SERVER(ino);
374 unsigned int max_payload;
375 int status;
376
377 if (!ff_layout_init_mirror_ds(lseg->pls_layout, mirror))
378 goto noconnect;
379
380 ds = mirror->mirror_ds->ds;
381 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
382 smp_rmb();
383 if (ds->ds_clp)
384 goto out;
385
386 /* FIXME: For now we assume the server sent only one version of NFS
387 * to use for the DS.
388 */
389 status = nfs4_pnfs_ds_connect(s, ds, &mirror->mirror_ds->id_node,
390 dataserver_timeo, dataserver_retrans,
391 mirror->mirror_ds->ds_versions[0].version,
392 mirror->mirror_ds->ds_versions[0].minor_version);
393
394 /* connect success, check rsize/wsize limit */
395 if (!status) {
396 max_payload =
397 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
398 NULL);
399 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
400 mirror->mirror_ds->ds_versions[0].rsize = max_payload;
401 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
402 mirror->mirror_ds->ds_versions[0].wsize = max_payload;
403 goto out;
404 }
405noconnect:
406 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
407 mirror, lseg->pls_range.offset,
408 lseg->pls_range.length, NFS4ERR_NXIO,
409 OP_ILLEGAL, GFP_NOIO);
410 ff_layout_send_layouterror(lseg);
411 if (fail_return || !ff_layout_has_available_ds(lseg))
412 pnfs_error_mark_layout_for_return(ino, lseg);
413 ds = NULL;
414out:
415 return ds;
416}
417
418const struct cred *
419ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror,
420 const struct pnfs_layout_range *range,
421 const struct cred *mdscred)
422{
423 const struct cred *cred;
424
425 if (mirror && !mirror->mirror_ds->ds_versions[0].tightly_coupled) {
426 cred = ff_layout_get_mirror_cred(mirror, range->iomode);
427 if (!cred)
428 cred = get_cred(mdscred);
429 } else {
430 cred = get_cred(mdscred);
431 }
432 return cred;
433}
434
435/**
436 * nfs4_ff_find_or_create_ds_client - Find or create a DS rpc client
437 * @mirror: pointer to the mirror
438 * @ds_clp: nfs_client for the DS
439 * @inode: pointer to inode
440 *
441 * Find or create a DS rpc client with th MDS server rpc client auth flavor
442 * in the nfs_client cl_ds_clients list.
443 */
444struct rpc_clnt *
445nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror,
446 struct nfs_client *ds_clp, struct inode *inode)
447{
448 switch (mirror->mirror_ds->ds_versions[0].version) {
449 case 3:
450 /* For NFSv3 DS, flavor is set when creating DS connections */
451 return ds_clp->cl_rpcclient;
452 case 4:
453 return nfs4_find_or_create_ds_client(ds_clp, inode);
454 default:
455 BUG();
456 }
457}
458
459void ff_layout_free_ds_ioerr(struct list_head *head)
460{
461 struct nfs4_ff_layout_ds_err *err;
462
463 while (!list_empty(head)) {
464 err = list_first_entry(head,
465 struct nfs4_ff_layout_ds_err,
466 list);
467 list_del(&err->list);
468 kfree(err);
469 }
470}
471
472/* called with inode i_lock held */
473int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head)
474{
475 struct nfs4_ff_layout_ds_err *err;
476 __be32 *p;
477
478 list_for_each_entry(err, head, list) {
479 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
480 * + array length + deviceid(NFS4_DEVICEID4_SIZE)
481 * + status(4) + opnum(4)
482 */
483 p = xdr_reserve_space(xdr,
484 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
485 if (unlikely(!p))
486 return -ENOBUFS;
487 p = xdr_encode_hyper(p, err->offset);
488 p = xdr_encode_hyper(p, err->length);
489 p = xdr_encode_opaque_fixed(p, &err->stateid,
490 NFS4_STATEID_SIZE);
491 /* Encode 1 error */
492 *p++ = cpu_to_be32(1);
493 p = xdr_encode_opaque_fixed(p, &err->deviceid,
494 NFS4_DEVICEID4_SIZE);
495 *p++ = cpu_to_be32(err->status);
496 *p++ = cpu_to_be32(err->opnum);
497 dprintk("%s: offset %llu length %llu status %d op %d\n",
498 __func__, err->offset, err->length, err->status,
499 err->opnum);
500 }
501
502 return 0;
503}
504
505static
506unsigned int do_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
507 const struct pnfs_layout_range *range,
508 struct list_head *head,
509 unsigned int maxnum)
510{
511 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
512 struct inode *inode = lo->plh_inode;
513 struct nfs4_ff_layout_ds_err *err, *n;
514 unsigned int ret = 0;
515
516 spin_lock(&inode->i_lock);
517 list_for_each_entry_safe(err, n, &flo->error_list, list) {
518 if (!pnfs_is_range_intersecting(err->offset,
519 pnfs_end_offset(err->offset, err->length),
520 range->offset,
521 pnfs_end_offset(range->offset, range->length)))
522 continue;
523 if (!maxnum)
524 break;
525 list_move(&err->list, head);
526 maxnum--;
527 ret++;
528 }
529 spin_unlock(&inode->i_lock);
530 return ret;
531}
532
533unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
534 const struct pnfs_layout_range *range,
535 struct list_head *head,
536 unsigned int maxnum)
537{
538 unsigned int ret;
539
540 ret = do_layout_fetch_ds_ioerr(lo, range, head, maxnum);
541 /* If we're over the max, discard all remaining entries */
542 if (ret == maxnum) {
543 LIST_HEAD(discard);
544 do_layout_fetch_ds_ioerr(lo, range, &discard, -1);
545 ff_layout_free_ds_ioerr(&discard);
546 }
547 return ret;
548}
549
550static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
551{
552 struct nfs4_ff_layout_mirror *mirror;
553 struct nfs4_deviceid_node *devid;
554 u32 idx;
555
556 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
557 mirror = FF_LAYOUT_COMP(lseg, idx);
558 if (mirror) {
559 if (!mirror->mirror_ds)
560 return true;
561 if (IS_ERR(mirror->mirror_ds))
562 continue;
563 devid = &mirror->mirror_ds->id_node;
564 if (!nfs4_test_deviceid_unavailable(devid))
565 return true;
566 }
567 }
568
569 return false;
570}
571
572static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
573{
574 struct nfs4_ff_layout_mirror *mirror;
575 struct nfs4_deviceid_node *devid;
576 u32 idx;
577
578 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
579 mirror = FF_LAYOUT_COMP(lseg, idx);
580 if (!mirror || IS_ERR(mirror->mirror_ds))
581 return false;
582 if (!mirror->mirror_ds)
583 continue;
584 devid = &mirror->mirror_ds->id_node;
585 if (nfs4_test_deviceid_unavailable(devid))
586 return false;
587 }
588
589 return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
590}
591
592static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
593{
594 if (lseg->pls_range.iomode == IOMODE_READ)
595 return ff_read_layout_has_available_ds(lseg);
596 /* Note: RW layout needs all mirrors available */
597 return ff_rw_layout_has_available_ds(lseg);
598}
599
600bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg)
601{
602 return ff_layout_no_fallback_to_mds(lseg) ||
603 ff_layout_has_available_ds(lseg);
604}
605
606bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg)
607{
608 return lseg->pls_range.iomode == IOMODE_RW &&
609 ff_layout_no_read_on_rw(lseg);
610}
611
612module_param(dataserver_retrans, uint, 0644);
613MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
614 "retries a request before it attempts further "
615 " recovery action.");
616module_param(dataserver_timeo, uint, 0644);
617MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
618 "NFSv4.1 client waits for a response from a "
619 " data server before it retries an NFS request.");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Device operations for the pnfs nfs4 file layout driver.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tao Peng <bergwolf@primarydata.com>
8 */
9
10#include <linux/nfs_fs.h>
11#include <linux/vmalloc.h>
12#include <linux/module.h>
13#include <linux/sunrpc/addr.h>
14
15#include "../internal.h"
16#include "../nfs4session.h"
17#include "flexfilelayout.h"
18
19#define NFSDBG_FACILITY NFSDBG_PNFS_LD
20
21static unsigned int dataserver_timeo = NFS_DEF_TCP_TIMEO;
22static unsigned int dataserver_retrans;
23
24static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
25
26void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
27{
28 if (!IS_ERR_OR_NULL(mirror_ds))
29 nfs4_put_deviceid_node(&mirror_ds->id_node);
30}
31
32void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
33{
34 nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
35 nfs4_pnfs_ds_put(mirror_ds->ds);
36 kfree(mirror_ds->ds_versions);
37 kfree_rcu(mirror_ds, id_node.rcu);
38}
39
40/* Decode opaque device data and construct new_ds using it */
41struct nfs4_ff_layout_ds *
42nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
43 gfp_t gfp_flags)
44{
45 struct xdr_stream stream;
46 struct xdr_buf buf;
47 struct page *scratch;
48 struct list_head dsaddrs;
49 struct nfs4_pnfs_ds_addr *da;
50 struct nfs4_ff_layout_ds *new_ds = NULL;
51 struct nfs4_ff_ds_version *ds_versions = NULL;
52 u32 mp_count;
53 u32 version_count;
54 __be32 *p;
55 int i, ret = -ENOMEM;
56
57 /* set up xdr stream */
58 scratch = alloc_page(gfp_flags);
59 if (!scratch)
60 goto out_err;
61
62 new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
63 if (!new_ds)
64 goto out_scratch;
65
66 nfs4_init_deviceid_node(&new_ds->id_node,
67 server,
68 &pdev->dev_id);
69 INIT_LIST_HEAD(&dsaddrs);
70
71 xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
72 xdr_set_scratch_page(&stream, scratch);
73
74 /* multipath count */
75 p = xdr_inline_decode(&stream, 4);
76 if (unlikely(!p))
77 goto out_err_drain_dsaddrs;
78 mp_count = be32_to_cpup(p);
79 dprintk("%s: multipath ds count %d\n", __func__, mp_count);
80
81 for (i = 0; i < mp_count; i++) {
82 /* multipath ds */
83 da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
84 &stream, gfp_flags);
85 if (da)
86 list_add_tail(&da->da_node, &dsaddrs);
87 }
88 if (list_empty(&dsaddrs)) {
89 dprintk("%s: no suitable DS addresses found\n",
90 __func__);
91 ret = -ENOMEDIUM;
92 goto out_err_drain_dsaddrs;
93 }
94
95 /* version count */
96 p = xdr_inline_decode(&stream, 4);
97 if (unlikely(!p))
98 goto out_err_drain_dsaddrs;
99 version_count = be32_to_cpup(p);
100 dprintk("%s: version count %d\n", __func__, version_count);
101
102 ds_versions = kcalloc(version_count,
103 sizeof(struct nfs4_ff_ds_version),
104 gfp_flags);
105 if (!ds_versions)
106 goto out_scratch;
107
108 for (i = 0; i < version_count; i++) {
109 /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
110 * tightly_coupled(4) */
111 p = xdr_inline_decode(&stream, 20);
112 if (unlikely(!p))
113 goto out_err_drain_dsaddrs;
114 ds_versions[i].version = be32_to_cpup(p++);
115 ds_versions[i].minor_version = be32_to_cpup(p++);
116 ds_versions[i].rsize = nfs_io_size(be32_to_cpup(p++),
117 server->nfs_client->cl_proto);
118 ds_versions[i].wsize = nfs_io_size(be32_to_cpup(p++),
119 server->nfs_client->cl_proto);
120 ds_versions[i].tightly_coupled = be32_to_cpup(p);
121
122 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
123 ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
124 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
125 ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
126
127 /*
128 * check for valid major/minor combination.
129 * currently we support dataserver which talk:
130 * v3, v4.0, v4.1, v4.2
131 */
132 if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||
133 (ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {
134 dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
135 i, ds_versions[i].version,
136 ds_versions[i].minor_version);
137 ret = -EPROTONOSUPPORT;
138 goto out_err_drain_dsaddrs;
139 }
140
141 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
142 __func__, i, ds_versions[i].version,
143 ds_versions[i].minor_version,
144 ds_versions[i].rsize,
145 ds_versions[i].wsize,
146 ds_versions[i].tightly_coupled);
147 }
148
149 new_ds->ds_versions = ds_versions;
150 new_ds->ds_versions_cnt = version_count;
151
152 new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
153 if (!new_ds->ds)
154 goto out_err_drain_dsaddrs;
155
156 /* If DS was already in cache, free ds addrs */
157 while (!list_empty(&dsaddrs)) {
158 da = list_first_entry(&dsaddrs,
159 struct nfs4_pnfs_ds_addr,
160 da_node);
161 list_del_init(&da->da_node);
162 kfree(da->da_remotestr);
163 kfree(da);
164 }
165
166 __free_page(scratch);
167 return new_ds;
168
169out_err_drain_dsaddrs:
170 while (!list_empty(&dsaddrs)) {
171 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
172 da_node);
173 list_del_init(&da->da_node);
174 kfree(da->da_remotestr);
175 kfree(da);
176 }
177
178 kfree(ds_versions);
179out_scratch:
180 __free_page(scratch);
181out_err:
182 kfree(new_ds);
183
184 dprintk("%s ERROR: returning %d\n", __func__, ret);
185 return NULL;
186}
187
188static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
189 u64 offset, u64 length)
190{
191 u64 end;
192
193 end = max_t(u64, pnfs_end_offset(err->offset, err->length),
194 pnfs_end_offset(offset, length));
195 err->offset = min_t(u64, err->offset, offset);
196 err->length = end - err->offset;
197}
198
199static int
200ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
201 const struct nfs4_ff_layout_ds_err *e2)
202{
203 int ret;
204
205 if (e1->opnum != e2->opnum)
206 return e1->opnum < e2->opnum ? -1 : 1;
207 if (e1->status != e2->status)
208 return e1->status < e2->status ? -1 : 1;
209 ret = memcmp(e1->stateid.data, e2->stateid.data,
210 sizeof(e1->stateid.data));
211 if (ret != 0)
212 return ret;
213 ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
214 if (ret != 0)
215 return ret;
216 if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)
217 return -1;
218 if (e1->offset > pnfs_end_offset(e2->offset, e2->length))
219 return 1;
220 /* If ranges overlap or are contiguous, they are the same */
221 return 0;
222}
223
224static void
225ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
226 struct nfs4_ff_layout_ds_err *dserr)
227{
228 struct nfs4_ff_layout_ds_err *err, *tmp;
229 struct list_head *head = &flo->error_list;
230 int match;
231
232 /* Do insertion sort w/ merges */
233 list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
234 match = ff_ds_error_match(err, dserr);
235 if (match < 0)
236 continue;
237 if (match > 0) {
238 /* Add entry "dserr" _before_ entry "err" */
239 head = &err->list;
240 break;
241 }
242 /* Entries match, so merge "err" into "dserr" */
243 extend_ds_error(dserr, err->offset, err->length);
244 list_replace(&err->list, &dserr->list);
245 kfree(err);
246 return;
247 }
248
249 list_add_tail(&dserr->list, head);
250}
251
252int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
253 struct nfs4_ff_layout_mirror *mirror, u64 offset,
254 u64 length, int status, enum nfs_opnum4 opnum,
255 gfp_t gfp_flags)
256{
257 struct nfs4_ff_layout_ds_err *dserr;
258
259 if (status == 0)
260 return 0;
261
262 if (IS_ERR_OR_NULL(mirror->mirror_ds))
263 return -EINVAL;
264
265 dserr = kmalloc(sizeof(*dserr), gfp_flags);
266 if (!dserr)
267 return -ENOMEM;
268
269 INIT_LIST_HEAD(&dserr->list);
270 dserr->offset = offset;
271 dserr->length = length;
272 dserr->status = status;
273 dserr->opnum = opnum;
274 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
275 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
276 NFS4_DEVICEID4_SIZE);
277
278 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
279 ff_layout_add_ds_error_locked(flo, dserr);
280 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
281 return 0;
282}
283
284static const struct cred *
285ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
286{
287 const struct cred *cred, __rcu **pcred;
288
289 if (iomode == IOMODE_READ)
290 pcred = &mirror->ro_cred;
291 else
292 pcred = &mirror->rw_cred;
293
294 rcu_read_lock();
295 do {
296 cred = rcu_dereference(*pcred);
297 if (!cred)
298 break;
299
300 cred = get_cred_rcu(cred);
301 } while(!cred);
302 rcu_read_unlock();
303 return cred;
304}
305
306struct nfs_fh *
307nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror)
308{
309 /* FIXME: For now assume there is only 1 version available for the DS */
310 return &mirror->fh_versions[0];
311}
312
313void
314nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
315 nfs4_stateid *stateid)
316{
317 if (nfs4_ff_layout_ds_version(mirror) == 4)
318 nfs4_stateid_copy(stateid, &mirror->stateid);
319}
320
321static bool
322ff_layout_init_mirror_ds(struct pnfs_layout_hdr *lo,
323 struct nfs4_ff_layout_mirror *mirror)
324{
325 if (mirror == NULL)
326 goto outerr;
327 if (mirror->mirror_ds == NULL) {
328 struct nfs4_deviceid_node *node;
329 struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
330
331 node = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode),
332 &mirror->devid, lo->plh_lc_cred,
333 GFP_KERNEL);
334 if (node)
335 mirror_ds = FF_LAYOUT_MIRROR_DS(node);
336
337 /* check for race with another call to this function */
338 if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
339 mirror_ds != ERR_PTR(-ENODEV))
340 nfs4_put_deviceid_node(node);
341 }
342
343 if (IS_ERR(mirror->mirror_ds))
344 goto outerr;
345
346 return true;
347outerr:
348 return false;
349}
350
351/**
352 * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
353 * @lseg: the layout segment we're operating on
354 * @mirror: layout mirror describing the DS to use
355 * @fail_return: return layout on connect failure?
356 *
357 * Try to prepare a DS connection to accept an RPC call. This involves
358 * selecting a mirror to use and connecting the client to it if it's not
359 * already connected.
360 *
361 * Since we only need a single functioning mirror to satisfy a read, we don't
362 * want to return the layout if there is one. For writes though, any down
363 * mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish
364 * between the two cases.
365 *
366 * Returns a pointer to a connected DS object on success or NULL on failure.
367 */
368struct nfs4_pnfs_ds *
369nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
370 struct nfs4_ff_layout_mirror *mirror,
371 bool fail_return)
372{
373 struct nfs4_pnfs_ds *ds = NULL;
374 struct inode *ino = lseg->pls_layout->plh_inode;
375 struct nfs_server *s = NFS_SERVER(ino);
376 unsigned int max_payload;
377 int status;
378
379 if (!ff_layout_init_mirror_ds(lseg->pls_layout, mirror))
380 goto noconnect;
381
382 ds = mirror->mirror_ds->ds;
383 if (READ_ONCE(ds->ds_clp))
384 goto out;
385 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
386 smp_rmb();
387
388 /* FIXME: For now we assume the server sent only one version of NFS
389 * to use for the DS.
390 */
391 status = nfs4_pnfs_ds_connect(s, ds, &mirror->mirror_ds->id_node,
392 dataserver_timeo, dataserver_retrans,
393 mirror->mirror_ds->ds_versions[0].version,
394 mirror->mirror_ds->ds_versions[0].minor_version);
395
396 /* connect success, check rsize/wsize limit */
397 if (!status) {
398 max_payload =
399 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
400 NULL);
401 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
402 mirror->mirror_ds->ds_versions[0].rsize = max_payload;
403 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
404 mirror->mirror_ds->ds_versions[0].wsize = max_payload;
405 goto out;
406 }
407noconnect:
408 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
409 mirror, lseg->pls_range.offset,
410 lseg->pls_range.length, NFS4ERR_NXIO,
411 OP_ILLEGAL, GFP_NOIO);
412 ff_layout_send_layouterror(lseg);
413 if (fail_return || !ff_layout_has_available_ds(lseg))
414 pnfs_error_mark_layout_for_return(ino, lseg);
415 ds = NULL;
416out:
417 return ds;
418}
419
420const struct cred *
421ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror,
422 const struct pnfs_layout_range *range,
423 const struct cred *mdscred)
424{
425 const struct cred *cred;
426
427 if (mirror && !mirror->mirror_ds->ds_versions[0].tightly_coupled) {
428 cred = ff_layout_get_mirror_cred(mirror, range->iomode);
429 if (!cred)
430 cred = get_cred(mdscred);
431 } else {
432 cred = get_cred(mdscred);
433 }
434 return cred;
435}
436
437/**
438 * nfs4_ff_find_or_create_ds_client - Find or create a DS rpc client
439 * @mirror: pointer to the mirror
440 * @ds_clp: nfs_client for the DS
441 * @inode: pointer to inode
442 *
443 * Find or create a DS rpc client with th MDS server rpc client auth flavor
444 * in the nfs_client cl_ds_clients list.
445 */
446struct rpc_clnt *
447nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror,
448 struct nfs_client *ds_clp, struct inode *inode)
449{
450 switch (mirror->mirror_ds->ds_versions[0].version) {
451 case 3:
452 /* For NFSv3 DS, flavor is set when creating DS connections */
453 return ds_clp->cl_rpcclient;
454 case 4:
455 return nfs4_find_or_create_ds_client(ds_clp, inode);
456 default:
457 BUG();
458 }
459}
460
461void ff_layout_free_ds_ioerr(struct list_head *head)
462{
463 struct nfs4_ff_layout_ds_err *err;
464
465 while (!list_empty(head)) {
466 err = list_first_entry(head,
467 struct nfs4_ff_layout_ds_err,
468 list);
469 list_del(&err->list);
470 kfree(err);
471 }
472}
473
474/* called with inode i_lock held */
475int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head)
476{
477 struct nfs4_ff_layout_ds_err *err;
478 __be32 *p;
479
480 list_for_each_entry(err, head, list) {
481 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
482 * + array length + deviceid(NFS4_DEVICEID4_SIZE)
483 * + status(4) + opnum(4)
484 */
485 p = xdr_reserve_space(xdr,
486 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
487 if (unlikely(!p))
488 return -ENOBUFS;
489 p = xdr_encode_hyper(p, err->offset);
490 p = xdr_encode_hyper(p, err->length);
491 p = xdr_encode_opaque_fixed(p, &err->stateid,
492 NFS4_STATEID_SIZE);
493 /* Encode 1 error */
494 *p++ = cpu_to_be32(1);
495 p = xdr_encode_opaque_fixed(p, &err->deviceid,
496 NFS4_DEVICEID4_SIZE);
497 *p++ = cpu_to_be32(err->status);
498 *p++ = cpu_to_be32(err->opnum);
499 dprintk("%s: offset %llu length %llu status %d op %d\n",
500 __func__, err->offset, err->length, err->status,
501 err->opnum);
502 }
503
504 return 0;
505}
506
507static
508unsigned int do_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
509 const struct pnfs_layout_range *range,
510 struct list_head *head,
511 unsigned int maxnum)
512{
513 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
514 struct inode *inode = lo->plh_inode;
515 struct nfs4_ff_layout_ds_err *err, *n;
516 unsigned int ret = 0;
517
518 spin_lock(&inode->i_lock);
519 list_for_each_entry_safe(err, n, &flo->error_list, list) {
520 if (!pnfs_is_range_intersecting(err->offset,
521 pnfs_end_offset(err->offset, err->length),
522 range->offset,
523 pnfs_end_offset(range->offset, range->length)))
524 continue;
525 if (!maxnum)
526 break;
527 list_move(&err->list, head);
528 maxnum--;
529 ret++;
530 }
531 spin_unlock(&inode->i_lock);
532 return ret;
533}
534
535unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
536 const struct pnfs_layout_range *range,
537 struct list_head *head,
538 unsigned int maxnum)
539{
540 unsigned int ret;
541
542 ret = do_layout_fetch_ds_ioerr(lo, range, head, maxnum);
543 /* If we're over the max, discard all remaining entries */
544 if (ret == maxnum) {
545 LIST_HEAD(discard);
546 do_layout_fetch_ds_ioerr(lo, range, &discard, -1);
547 ff_layout_free_ds_ioerr(&discard);
548 }
549 return ret;
550}
551
552static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
553{
554 struct nfs4_ff_layout_mirror *mirror;
555 struct nfs4_deviceid_node *devid;
556 u32 idx;
557
558 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
559 mirror = FF_LAYOUT_COMP(lseg, idx);
560 if (mirror) {
561 if (!mirror->mirror_ds)
562 return true;
563 if (IS_ERR(mirror->mirror_ds))
564 continue;
565 devid = &mirror->mirror_ds->id_node;
566 if (!nfs4_test_deviceid_unavailable(devid))
567 return true;
568 }
569 }
570
571 return false;
572}
573
574static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
575{
576 struct nfs4_ff_layout_mirror *mirror;
577 struct nfs4_deviceid_node *devid;
578 u32 idx;
579
580 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
581 mirror = FF_LAYOUT_COMP(lseg, idx);
582 if (!mirror || IS_ERR(mirror->mirror_ds))
583 return false;
584 if (!mirror->mirror_ds)
585 continue;
586 devid = &mirror->mirror_ds->id_node;
587 if (nfs4_test_deviceid_unavailable(devid))
588 return false;
589 }
590
591 return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
592}
593
594static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
595{
596 if (lseg->pls_range.iomode == IOMODE_READ)
597 return ff_read_layout_has_available_ds(lseg);
598 /* Note: RW layout needs all mirrors available */
599 return ff_rw_layout_has_available_ds(lseg);
600}
601
602bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg)
603{
604 return ff_layout_no_fallback_to_mds(lseg) ||
605 ff_layout_has_available_ds(lseg);
606}
607
608bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg)
609{
610 return lseg->pls_range.iomode == IOMODE_RW &&
611 ff_layout_no_read_on_rw(lseg);
612}
613
614module_param(dataserver_retrans, uint, 0644);
615MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
616 "retries a request before it attempts further "
617 " recovery action.");
618module_param(dataserver_timeo, uint, 0644);
619MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
620 "NFSv4.1 client waits for a response from a "
621 " data server before it retries an NFS request.");