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
21 static unsigned int dataserver_timeo = NFS_DEF_TCP_TIMEO;
22 static unsigned int dataserver_retrans;
23
24 static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
25
nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds * mirror_ds)26 void 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
nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds * mirror_ds)32 void 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 */
41 struct nfs4_ff_layout_ds *
nfs4_ff_alloc_deviceid_node(struct nfs_server * server,struct pnfs_device * pdev,gfp_t gfp_flags)42 nfs4_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_buffer(&stream, page_address(scratch), PAGE_SIZE);
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 = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),
103 gfp_flags);
104 if (!ds_versions)
105 goto out_scratch;
106
107 for (i = 0; i < version_count; i++) {
108 /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
109 * tightly_coupled(4) */
110 p = xdr_inline_decode(&stream, 20);
111 if (unlikely(!p))
112 goto out_err_drain_dsaddrs;
113 ds_versions[i].version = be32_to_cpup(p++);
114 ds_versions[i].minor_version = be32_to_cpup(p++);
115 ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
116 ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
117 ds_versions[i].tightly_coupled = be32_to_cpup(p);
118
119 if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
120 ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
121 if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
122 ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
123
124 /*
125 * check for valid major/minor combination.
126 * currently we support dataserver which talk:
127 * v3, v4.0, v4.1, v4.2
128 */
129 if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||
130 (ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {
131 dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
132 i, ds_versions[i].version,
133 ds_versions[i].minor_version);
134 ret = -EPROTONOSUPPORT;
135 goto out_err_drain_dsaddrs;
136 }
137
138 dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
139 __func__, i, ds_versions[i].version,
140 ds_versions[i].minor_version,
141 ds_versions[i].rsize,
142 ds_versions[i].wsize,
143 ds_versions[i].tightly_coupled);
144 }
145
146 new_ds->ds_versions = ds_versions;
147 new_ds->ds_versions_cnt = version_count;
148
149 new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
150 if (!new_ds->ds)
151 goto out_err_drain_dsaddrs;
152
153 /* If DS was already in cache, free ds addrs */
154 while (!list_empty(&dsaddrs)) {
155 da = list_first_entry(&dsaddrs,
156 struct nfs4_pnfs_ds_addr,
157 da_node);
158 list_del_init(&da->da_node);
159 kfree(da->da_remotestr);
160 kfree(da);
161 }
162
163 __free_page(scratch);
164 return new_ds;
165
166 out_err_drain_dsaddrs:
167 while (!list_empty(&dsaddrs)) {
168 da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
169 da_node);
170 list_del_init(&da->da_node);
171 kfree(da->da_remotestr);
172 kfree(da);
173 }
174
175 kfree(ds_versions);
176 out_scratch:
177 __free_page(scratch);
178 out_err:
179 kfree(new_ds);
180
181 dprintk("%s ERROR: returning %d\n", __func__, ret);
182 return NULL;
183 }
184
ff_layout_mark_devid_invalid(struct pnfs_layout_segment * lseg,struct nfs4_deviceid_node * devid)185 static void ff_layout_mark_devid_invalid(struct pnfs_layout_segment *lseg,
186 struct nfs4_deviceid_node *devid)
187 {
188 nfs4_delete_deviceid(devid->ld, devid->nfs_client, &devid->deviceid);
189 if (!ff_layout_has_available_ds(lseg))
190 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
191 lseg);
192 }
193
ff_layout_mirror_valid(struct pnfs_layout_segment * lseg,struct nfs4_ff_layout_mirror * mirror,bool create)194 static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
195 struct nfs4_ff_layout_mirror *mirror,
196 bool create)
197 {
198 if (mirror == NULL || IS_ERR(mirror->mirror_ds))
199 goto outerr;
200 if (mirror->mirror_ds == NULL) {
201 if (create) {
202 struct nfs4_deviceid_node *node;
203 struct pnfs_layout_hdr *lh = lseg->pls_layout;
204 struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
205
206 node = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
207 &mirror->devid, lh->plh_lc_cred,
208 GFP_KERNEL);
209 if (node)
210 mirror_ds = FF_LAYOUT_MIRROR_DS(node);
211
212 /* check for race with another call to this function */
213 if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
214 mirror_ds != ERR_PTR(-ENODEV))
215 nfs4_put_deviceid_node(node);
216 } else
217 goto outerr;
218 }
219
220 if (IS_ERR(mirror->mirror_ds))
221 goto outerr;
222
223 if (mirror->mirror_ds->ds == NULL) {
224 struct nfs4_deviceid_node *devid;
225 devid = &mirror->mirror_ds->id_node;
226 ff_layout_mark_devid_invalid(lseg, devid);
227 return false;
228 }
229 return true;
230 outerr:
231 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
232 return false;
233 }
234
extend_ds_error(struct nfs4_ff_layout_ds_err * err,u64 offset,u64 length)235 static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
236 u64 offset, u64 length)
237 {
238 u64 end;
239
240 end = max_t(u64, pnfs_end_offset(err->offset, err->length),
241 pnfs_end_offset(offset, length));
242 err->offset = min_t(u64, err->offset, offset);
243 err->length = end - err->offset;
244 }
245
246 static int
ff_ds_error_match(const struct nfs4_ff_layout_ds_err * e1,const struct nfs4_ff_layout_ds_err * e2)247 ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
248 const struct nfs4_ff_layout_ds_err *e2)
249 {
250 int ret;
251
252 if (e1->opnum != e2->opnum)
253 return e1->opnum < e2->opnum ? -1 : 1;
254 if (e1->status != e2->status)
255 return e1->status < e2->status ? -1 : 1;
256 ret = memcmp(e1->stateid.data, e2->stateid.data,
257 sizeof(e1->stateid.data));
258 if (ret != 0)
259 return ret;
260 ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
261 if (ret != 0)
262 return ret;
263 if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)
264 return -1;
265 if (e1->offset > pnfs_end_offset(e2->offset, e2->length))
266 return 1;
267 /* If ranges overlap or are contiguous, they are the same */
268 return 0;
269 }
270
271 static void
ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout * flo,struct nfs4_ff_layout_ds_err * dserr)272 ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
273 struct nfs4_ff_layout_ds_err *dserr)
274 {
275 struct nfs4_ff_layout_ds_err *err, *tmp;
276 struct list_head *head = &flo->error_list;
277 int match;
278
279 /* Do insertion sort w/ merges */
280 list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
281 match = ff_ds_error_match(err, dserr);
282 if (match < 0)
283 continue;
284 if (match > 0) {
285 /* Add entry "dserr" _before_ entry "err" */
286 head = &err->list;
287 break;
288 }
289 /* Entries match, so merge "err" into "dserr" */
290 extend_ds_error(dserr, err->offset, err->length);
291 list_replace(&err->list, &dserr->list);
292 kfree(err);
293 return;
294 }
295
296 list_add_tail(&dserr->list, head);
297 }
298
ff_layout_track_ds_error(struct nfs4_flexfile_layout * flo,struct nfs4_ff_layout_mirror * mirror,u64 offset,u64 length,int status,enum nfs_opnum4 opnum,gfp_t gfp_flags)299 int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
300 struct nfs4_ff_layout_mirror *mirror, u64 offset,
301 u64 length, int status, enum nfs_opnum4 opnum,
302 gfp_t gfp_flags)
303 {
304 struct nfs4_ff_layout_ds_err *dserr;
305
306 if (status == 0)
307 return 0;
308
309 if (IS_ERR_OR_NULL(mirror->mirror_ds))
310 return -EINVAL;
311
312 dserr = kmalloc(sizeof(*dserr), gfp_flags);
313 if (!dserr)
314 return -ENOMEM;
315
316 INIT_LIST_HEAD(&dserr->list);
317 dserr->offset = offset;
318 dserr->length = length;
319 dserr->status = status;
320 dserr->opnum = opnum;
321 nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
322 memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
323 NFS4_DEVICEID4_SIZE);
324
325 spin_lock(&flo->generic_hdr.plh_inode->i_lock);
326 ff_layout_add_ds_error_locked(flo, dserr);
327 spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
328
329 return 0;
330 }
331
332 static struct rpc_cred *
ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror * mirror,u32 iomode)333 ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
334 {
335 struct rpc_cred *cred, __rcu **pcred;
336
337 if (iomode == IOMODE_READ)
338 pcred = &mirror->ro_cred;
339 else
340 pcred = &mirror->rw_cred;
341
342 rcu_read_lock();
343 do {
344 cred = rcu_dereference(*pcred);
345 if (!cred)
346 break;
347
348 cred = get_rpccred_rcu(cred);
349 } while(!cred);
350 rcu_read_unlock();
351 return cred;
352 }
353
354 struct nfs_fh *
nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment * lseg,u32 mirror_idx)355 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
356 {
357 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
358 struct nfs_fh *fh = NULL;
359
360 if (!ff_layout_mirror_valid(lseg, mirror, false)) {
361 pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
362 __func__, mirror_idx);
363 goto out;
364 }
365
366 /* FIXME: For now assume there is only 1 version available for the DS */
367 fh = &mirror->fh_versions[0];
368 out:
369 return fh;
370 }
371
372 int
nfs4_ff_layout_select_ds_stateid(struct pnfs_layout_segment * lseg,u32 mirror_idx,nfs4_stateid * stateid)373 nfs4_ff_layout_select_ds_stateid(struct pnfs_layout_segment *lseg,
374 u32 mirror_idx,
375 nfs4_stateid *stateid)
376 {
377 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
378
379 if (!ff_layout_mirror_valid(lseg, mirror, false)) {
380 pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
381 __func__, mirror_idx);
382 goto out;
383 }
384
385 nfs4_stateid_copy(stateid, &mirror->stateid);
386 return 1;
387 out:
388 return 0;
389 }
390
391 /**
392 * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
393 * @lseg: the layout segment we're operating on
394 * @ds_idx: index of the DS to use
395 * @fail_return: return layout on connect failure?
396 *
397 * Try to prepare a DS connection to accept an RPC call. This involves
398 * selecting a mirror to use and connecting the client to it if it's not
399 * already connected.
400 *
401 * Since we only need a single functioning mirror to satisfy a read, we don't
402 * want to return the layout if there is one. For writes though, any down
403 * mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish
404 * between the two cases.
405 *
406 * Returns a pointer to a connected DS object on success or NULL on failure.
407 */
408 struct nfs4_pnfs_ds *
nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment * lseg,u32 ds_idx,bool fail_return)409 nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
410 bool fail_return)
411 {
412 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
413 struct nfs4_pnfs_ds *ds = NULL;
414 struct nfs4_deviceid_node *devid;
415 struct inode *ino = lseg->pls_layout->plh_inode;
416 struct nfs_server *s = NFS_SERVER(ino);
417 unsigned int max_payload;
418 int status;
419
420 if (!ff_layout_mirror_valid(lseg, mirror, true)) {
421 pr_err_ratelimited("NFS: %s: No data server for offset index %d\n",
422 __func__, ds_idx);
423 goto out;
424 }
425
426 devid = &mirror->mirror_ds->id_node;
427 if (ff_layout_test_devid_unavailable(devid))
428 goto out_fail;
429
430 ds = mirror->mirror_ds->ds;
431 /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
432 smp_rmb();
433 if (ds->ds_clp)
434 goto out;
435
436 /* FIXME: For now we assume the server sent only one version of NFS
437 * to use for the DS.
438 */
439 status = nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
440 dataserver_retrans,
441 mirror->mirror_ds->ds_versions[0].version,
442 mirror->mirror_ds->ds_versions[0].minor_version);
443
444 /* connect success, check rsize/wsize limit */
445 if (!status) {
446 max_payload =
447 nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
448 NULL);
449 if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
450 mirror->mirror_ds->ds_versions[0].rsize = max_payload;
451 if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
452 mirror->mirror_ds->ds_versions[0].wsize = max_payload;
453 goto out;
454 }
455 out_fail:
456 ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
457 mirror, lseg->pls_range.offset,
458 lseg->pls_range.length, NFS4ERR_NXIO,
459 OP_ILLEGAL, GFP_NOIO);
460 if (fail_return || !ff_layout_has_available_ds(lseg))
461 pnfs_error_mark_layout_for_return(ino, lseg);
462 ds = NULL;
463 out:
464 return ds;
465 }
466
467 struct rpc_cred *
ff_layout_get_ds_cred(struct pnfs_layout_segment * lseg,u32 ds_idx,struct rpc_cred * mdscred)468 ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
469 struct rpc_cred *mdscred)
470 {
471 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
472 struct rpc_cred *cred;
473
474 if (mirror) {
475 cred = ff_layout_get_mirror_cred(mirror, lseg->pls_range.iomode);
476 if (!cred)
477 cred = get_rpccred(mdscred);
478 } else {
479 cred = get_rpccred(mdscred);
480 }
481 return cred;
482 }
483
484 /**
485 * Find or create a DS rpc client with th MDS server rpc client auth flavor
486 * in the nfs_client cl_ds_clients list.
487 */
488 struct rpc_clnt *
nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment * lseg,u32 ds_idx,struct nfs_client * ds_clp,struct inode * inode)489 nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
490 struct nfs_client *ds_clp, struct inode *inode)
491 {
492 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
493
494 switch (mirror->mirror_ds->ds_versions[0].version) {
495 case 3:
496 /* For NFSv3 DS, flavor is set when creating DS connections */
497 return ds_clp->cl_rpcclient;
498 case 4:
499 return nfs4_find_or_create_ds_client(ds_clp, inode);
500 default:
501 BUG();
502 }
503 }
504
ff_layout_free_ds_ioerr(struct list_head * head)505 void ff_layout_free_ds_ioerr(struct list_head *head)
506 {
507 struct nfs4_ff_layout_ds_err *err;
508
509 while (!list_empty(head)) {
510 err = list_first_entry(head,
511 struct nfs4_ff_layout_ds_err,
512 list);
513 list_del(&err->list);
514 kfree(err);
515 }
516 }
517
518 /* called with inode i_lock held */
ff_layout_encode_ds_ioerr(struct xdr_stream * xdr,const struct list_head * head)519 int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head)
520 {
521 struct nfs4_ff_layout_ds_err *err;
522 __be32 *p;
523
524 list_for_each_entry(err, head, list) {
525 /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
526 * + array length + deviceid(NFS4_DEVICEID4_SIZE)
527 * + status(4) + opnum(4)
528 */
529 p = xdr_reserve_space(xdr,
530 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
531 if (unlikely(!p))
532 return -ENOBUFS;
533 p = xdr_encode_hyper(p, err->offset);
534 p = xdr_encode_hyper(p, err->length);
535 p = xdr_encode_opaque_fixed(p, &err->stateid,
536 NFS4_STATEID_SIZE);
537 /* Encode 1 error */
538 *p++ = cpu_to_be32(1);
539 p = xdr_encode_opaque_fixed(p, &err->deviceid,
540 NFS4_DEVICEID4_SIZE);
541 *p++ = cpu_to_be32(err->status);
542 *p++ = cpu_to_be32(err->opnum);
543 dprintk("%s: offset %llu length %llu status %d op %d\n",
544 __func__, err->offset, err->length, err->status,
545 err->opnum);
546 }
547
548 return 0;
549 }
550
551 static
do_layout_fetch_ds_ioerr(struct pnfs_layout_hdr * lo,const struct pnfs_layout_range * range,struct list_head * head,unsigned int maxnum)552 unsigned int do_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
553 const struct pnfs_layout_range *range,
554 struct list_head *head,
555 unsigned int maxnum)
556 {
557 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
558 struct inode *inode = lo->plh_inode;
559 struct nfs4_ff_layout_ds_err *err, *n;
560 unsigned int ret = 0;
561
562 spin_lock(&inode->i_lock);
563 list_for_each_entry_safe(err, n, &flo->error_list, list) {
564 if (!pnfs_is_range_intersecting(err->offset,
565 pnfs_end_offset(err->offset, err->length),
566 range->offset,
567 pnfs_end_offset(range->offset, range->length)))
568 continue;
569 if (!maxnum)
570 break;
571 list_move(&err->list, head);
572 maxnum--;
573 ret++;
574 }
575 spin_unlock(&inode->i_lock);
576 return ret;
577 }
578
ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr * lo,const struct pnfs_layout_range * range,struct list_head * head,unsigned int maxnum)579 unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
580 const struct pnfs_layout_range *range,
581 struct list_head *head,
582 unsigned int maxnum)
583 {
584 unsigned int ret;
585
586 ret = do_layout_fetch_ds_ioerr(lo, range, head, maxnum);
587 /* If we're over the max, discard all remaining entries */
588 if (ret == maxnum) {
589 LIST_HEAD(discard);
590 do_layout_fetch_ds_ioerr(lo, range, &discard, -1);
591 ff_layout_free_ds_ioerr(&discard);
592 }
593 return ret;
594 }
595
ff_read_layout_has_available_ds(struct pnfs_layout_segment * lseg)596 static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
597 {
598 struct nfs4_ff_layout_mirror *mirror;
599 struct nfs4_deviceid_node *devid;
600 u32 idx;
601
602 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
603 mirror = FF_LAYOUT_COMP(lseg, idx);
604 if (mirror) {
605 if (!mirror->mirror_ds)
606 return true;
607 if (IS_ERR(mirror->mirror_ds))
608 continue;
609 devid = &mirror->mirror_ds->id_node;
610 if (!ff_layout_test_devid_unavailable(devid))
611 return true;
612 }
613 }
614
615 return false;
616 }
617
ff_rw_layout_has_available_ds(struct pnfs_layout_segment * lseg)618 static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
619 {
620 struct nfs4_ff_layout_mirror *mirror;
621 struct nfs4_deviceid_node *devid;
622 u32 idx;
623
624 for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
625 mirror = FF_LAYOUT_COMP(lseg, idx);
626 if (!mirror || IS_ERR(mirror->mirror_ds))
627 return false;
628 if (!mirror->mirror_ds)
629 continue;
630 devid = &mirror->mirror_ds->id_node;
631 if (ff_layout_test_devid_unavailable(devid))
632 return false;
633 }
634
635 return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
636 }
637
ff_layout_has_available_ds(struct pnfs_layout_segment * lseg)638 static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
639 {
640 if (lseg->pls_range.iomode == IOMODE_READ)
641 return ff_read_layout_has_available_ds(lseg);
642 /* Note: RW layout needs all mirrors available */
643 return ff_rw_layout_has_available_ds(lseg);
644 }
645
ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment * lseg)646 bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg)
647 {
648 return ff_layout_no_fallback_to_mds(lseg) ||
649 ff_layout_has_available_ds(lseg);
650 }
651
ff_layout_avoid_read_on_rw(struct pnfs_layout_segment * lseg)652 bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg)
653 {
654 return lseg->pls_range.iomode == IOMODE_RW &&
655 ff_layout_no_read_on_rw(lseg);
656 }
657
658 module_param(dataserver_retrans, uint, 0644);
659 MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
660 "retries a request before it attempts further "
661 " recovery action.");
662 module_param(dataserver_timeo, uint, 0644);
663 MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
664 "NFSv4.1 client waits for a response from a "
665 " data server before it retries an NFS request.");
666