aboutsummaryrefslogtreecommitdiffstats
path: root/fs/nfs/objlayout/objio_osd.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfs/objlayout/objio_osd.c')
-rw-r--r--fs/nfs/objlayout/objio_osd.c1057
1 files changed, 1057 insertions, 0 deletions
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
new file mode 100644
index 000000000000..9cf208df1f25
--- /dev/null
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -0,0 +1,1057 @@
1/*
2 * pNFS Objects layout implementation over open-osd initiator library
3 *
4 * Copyright (C) 2009 Panasas Inc. [year of first publication]
5 * All rights reserved.
6 *
7 * Benny Halevy <bhalevy@panasas.com>
8 * Boaz Harrosh <bharrosh@panasas.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * See the file COPYING included with this distribution for more details.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 *
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the Panasas company nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
28 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
30 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
34 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
35 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
36 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
37 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 */
39
40#include <linux/module.h>
41#include <scsi/osd_initiator.h>
42
43#include "objlayout.h"
44
45#define NFSDBG_FACILITY NFSDBG_PNFS_LD
46
47#define _LLU(x) ((unsigned long long)x)
48
49enum { BIO_MAX_PAGES_KMALLOC =
50 (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
51};
52
53struct objio_dev_ent {
54 struct nfs4_deviceid_node id_node;
55 struct osd_dev *od;
56};
57
58static void
59objio_free_deviceid_node(struct nfs4_deviceid_node *d)
60{
61 struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node);
62
63 dprintk("%s: free od=%p\n", __func__, de->od);
64 osduld_put_device(de->od);
65 kfree(de);
66}
67
68static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss,
69 const struct nfs4_deviceid *d_id)
70{
71 struct nfs4_deviceid_node *d;
72 struct objio_dev_ent *de;
73
74 d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id);
75 if (!d)
76 return NULL;
77
78 de = container_of(d, struct objio_dev_ent, id_node);
79 return de;
80}
81
82static struct objio_dev_ent *
83_dev_list_add(const struct nfs_server *nfss,
84 const struct nfs4_deviceid *d_id, struct osd_dev *od,
85 gfp_t gfp_flags)
86{
87 struct nfs4_deviceid_node *d;
88 struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
89 struct objio_dev_ent *n;
90
91 if (!de) {
92 dprintk("%s: -ENOMEM od=%p\n", __func__, od);
93 return NULL;
94 }
95
96 dprintk("%s: Adding od=%p\n", __func__, od);
97 nfs4_init_deviceid_node(&de->id_node,
98 nfss->pnfs_curr_ld,
99 nfss->nfs_client,
100 d_id);
101 de->od = od;
102
103 d = nfs4_insert_deviceid_node(&de->id_node);
104 n = container_of(d, struct objio_dev_ent, id_node);
105 if (n != de) {
106 dprintk("%s: Race with other n->od=%p\n", __func__, n->od);
107 objio_free_deviceid_node(&de->id_node);
108 de = n;
109 }
110
111 atomic_inc(&de->id_node.ref);
112 return de;
113}
114
115struct caps_buffers {
116 u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
117 u8 creds[OSD_CAP_LEN];
118};
119
120struct objio_segment {
121 struct pnfs_layout_segment lseg;
122
123 struct pnfs_osd_object_cred *comps;
124
125 unsigned mirrors_p1;
126 unsigned stripe_unit;
127 unsigned group_width; /* Data stripe_units without integrity comps */
128 u64 group_depth;
129 unsigned group_count;
130
131 unsigned max_io_size;
132
133 unsigned comps_index;
134 unsigned num_comps;
135 /* variable length */
136 struct objio_dev_ent *ods[];
137};
138
139static inline struct objio_segment *
140OBJIO_LSEG(struct pnfs_layout_segment *lseg)
141{
142 return container_of(lseg, struct objio_segment, lseg);
143}
144
145struct objio_state;
146typedef ssize_t (*objio_done_fn)(struct objio_state *ios);
147
148struct objio_state {
149 /* Generic layer */
150 struct objlayout_io_state ol_state;
151
152 struct objio_segment *layout;
153
154 struct kref kref;
155 objio_done_fn done;
156 void *private;
157
158 unsigned long length;
159 unsigned numdevs; /* Actually used devs in this IO */
160 /* A per-device variable array of size numdevs */
161 struct _objio_per_comp {
162 struct bio *bio;
163 struct osd_request *or;
164 unsigned long length;
165 u64 offset;
166 unsigned dev;
167 } per_dev[];
168};
169
170/* Send and wait for a get_device_info of devices in the layout,
171 then look them up with the osd_initiator library */
172static struct objio_dev_ent *_device_lookup(struct pnfs_layout_hdr *pnfslay,
173 struct objio_segment *objio_seg, unsigned comp,
174 gfp_t gfp_flags)
175{
176 struct pnfs_osd_deviceaddr *deviceaddr;
177 struct nfs4_deviceid *d_id;
178 struct objio_dev_ent *ode;
179 struct osd_dev *od;
180 struct osd_dev_info odi;
181 int err;
182
183 d_id = &objio_seg->comps[comp].oc_object_id.oid_device_id;
184
185 ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id);
186 if (ode)
187 return ode;
188
189 err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
190 if (unlikely(err)) {
191 dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
192 __func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
193 return ERR_PTR(err);
194 }
195
196 odi.systemid_len = deviceaddr->oda_systemid.len;
197 if (odi.systemid_len > sizeof(odi.systemid)) {
198 err = -EINVAL;
199 goto out;
200 } else if (odi.systemid_len)
201 memcpy(odi.systemid, deviceaddr->oda_systemid.data,
202 odi.systemid_len);
203 odi.osdname_len = deviceaddr->oda_osdname.len;
204 odi.osdname = (u8 *)deviceaddr->oda_osdname.data;
205
206 if (!odi.osdname_len && !odi.systemid_len) {
207 dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
208 __func__);
209 err = -ENODEV;
210 goto out;
211 }
212
213 od = osduld_info_lookup(&odi);
214 if (unlikely(IS_ERR(od))) {
215 err = PTR_ERR(od);
216 dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
217 goto out;
218 }
219
220 ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od,
221 gfp_flags);
222
223out:
224 dprintk("%s: return=%d\n", __func__, err);
225 objlayout_put_deviceinfo(deviceaddr);
226 return err ? ERR_PTR(err) : ode;
227}
228
229static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
230 struct objio_segment *objio_seg,
231 gfp_t gfp_flags)
232{
233 unsigned i;
234 int err;
235
236 /* lookup all devices */
237 for (i = 0; i < objio_seg->num_comps; i++) {
238 struct objio_dev_ent *ode;
239
240 ode = _device_lookup(pnfslay, objio_seg, i, gfp_flags);
241 if (unlikely(IS_ERR(ode))) {
242 err = PTR_ERR(ode);
243 goto out;
244 }
245 objio_seg->ods[i] = ode;
246 }
247 err = 0;
248
249out:
250 dprintk("%s: return=%d\n", __func__, err);
251 return err;
252}
253
254static int _verify_data_map(struct pnfs_osd_layout *layout)
255{
256 struct pnfs_osd_data_map *data_map = &layout->olo_map;
257 u64 stripe_length;
258 u32 group_width;
259
260/* FIXME: Only raid0 for now. if not go through MDS */
261 if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) {
262 printk(KERN_ERR "Only RAID_0 for now\n");
263 return -ENOTSUPP;
264 }
265 if (0 != (data_map->odm_num_comps % (data_map->odm_mirror_cnt + 1))) {
266 printk(KERN_ERR "Data Map wrong, num_comps=%u mirrors=%u\n",
267 data_map->odm_num_comps, data_map->odm_mirror_cnt);
268 return -EINVAL;
269 }
270
271 if (data_map->odm_group_width)
272 group_width = data_map->odm_group_width;
273 else
274 group_width = data_map->odm_num_comps /
275 (data_map->odm_mirror_cnt + 1);
276
277 stripe_length = (u64)data_map->odm_stripe_unit * group_width;
278 if (stripe_length >= (1ULL << 32)) {
279 printk(KERN_ERR "Total Stripe length(0x%llx)"
280 " >= 32bit is not supported\n", _LLU(stripe_length));
281 return -ENOTSUPP;
282 }
283
284 if (0 != (data_map->odm_stripe_unit & ~PAGE_MASK)) {
285 printk(KERN_ERR "Stripe Unit(0x%llx)"
286 " must be Multples of PAGE_SIZE(0x%lx)\n",
287 _LLU(data_map->odm_stripe_unit), PAGE_SIZE);
288 return -ENOTSUPP;
289 }
290
291 return 0;
292}
293
294static void copy_single_comp(struct pnfs_osd_object_cred *cur_comp,
295 struct pnfs_osd_object_cred *src_comp,
296 struct caps_buffers *caps_p)
297{
298 WARN_ON(src_comp->oc_cap_key.cred_len > sizeof(caps_p->caps_key));
299 WARN_ON(src_comp->oc_cap.cred_len > sizeof(caps_p->creds));
300
301 *cur_comp = *src_comp;
302
303 memcpy(caps_p->caps_key, src_comp->oc_cap_key.cred,
304 sizeof(caps_p->caps_key));
305 cur_comp->oc_cap_key.cred = caps_p->caps_key;
306
307 memcpy(caps_p->creds, src_comp->oc_cap.cred,
308 sizeof(caps_p->creds));
309 cur_comp->oc_cap.cred = caps_p->creds;
310}
311
312int objio_alloc_lseg(struct pnfs_layout_segment **outp,
313 struct pnfs_layout_hdr *pnfslay,
314 struct pnfs_layout_range *range,
315 struct xdr_stream *xdr,
316 gfp_t gfp_flags)
317{
318 struct objio_segment *objio_seg;
319 struct pnfs_osd_xdr_decode_layout_iter iter;
320 struct pnfs_osd_layout layout;
321 struct pnfs_osd_object_cred *cur_comp, src_comp;
322 struct caps_buffers *caps_p;
323 int err;
324
325 err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
326 if (unlikely(err))
327 return err;
328
329 err = _verify_data_map(&layout);
330 if (unlikely(err))
331 return err;
332
333 objio_seg = kzalloc(sizeof(*objio_seg) +
334 sizeof(objio_seg->ods[0]) * layout.olo_num_comps +
335 sizeof(*objio_seg->comps) * layout.olo_num_comps +
336 sizeof(struct caps_buffers) * layout.olo_num_comps,
337 gfp_flags);
338 if (!objio_seg)
339 return -ENOMEM;
340
341 objio_seg->comps = (void *)(objio_seg->ods + layout.olo_num_comps);
342 cur_comp = objio_seg->comps;
343 caps_p = (void *)(cur_comp + layout.olo_num_comps);
344 while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err))
345 copy_single_comp(cur_comp++, &src_comp, caps_p++);
346 if (unlikely(err))
347 goto err;
348
349 objio_seg->num_comps = layout.olo_num_comps;
350 objio_seg->comps_index = layout.olo_comps_index;
351 err = objio_devices_lookup(pnfslay, objio_seg, gfp_flags);
352 if (err)
353 goto err;
354
355 objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
356 objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit;
357 if (layout.olo_map.odm_group_width) {
358 objio_seg->group_width = layout.olo_map.odm_group_width;
359 objio_seg->group_depth = layout.olo_map.odm_group_depth;
360 objio_seg->group_count = layout.olo_map.odm_num_comps /
361 objio_seg->mirrors_p1 /
362 objio_seg->group_width;
363 } else {
364 objio_seg->group_width = layout.olo_map.odm_num_comps /
365 objio_seg->mirrors_p1;
366 objio_seg->group_depth = -1;
367 objio_seg->group_count = 1;
368 }
369
370 /* Cache this calculation it will hit for every page */
371 objio_seg->max_io_size = (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE -
372 objio_seg->stripe_unit) *
373 objio_seg->group_width;
374
375 *outp = &objio_seg->lseg;
376 return 0;
377
378err:
379 kfree(objio_seg);
380 dprintk("%s: Error: return %d\n", __func__, err);
381 *outp = NULL;
382 return err;
383}
384
385void objio_free_lseg(struct pnfs_layout_segment *lseg)
386{
387 int i;
388 struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
389
390 for (i = 0; i < objio_seg->num_comps; i++) {
391 if (!objio_seg->ods[i])
392 break;
393 nfs4_put_deviceid_node(&objio_seg->ods[i]->id_node);
394 }
395 kfree(objio_seg);
396}
397
398int objio_alloc_io_state(struct pnfs_layout_segment *lseg,
399 struct objlayout_io_state **outp,
400 gfp_t gfp_flags)
401{
402 struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
403 struct objio_state *ios;
404 const unsigned first_size = sizeof(*ios) +
405 objio_seg->num_comps * sizeof(ios->per_dev[0]);
406 const unsigned sec_size = objio_seg->num_comps *
407 sizeof(ios->ol_state.ioerrs[0]);
408
409 ios = kzalloc(first_size + sec_size, gfp_flags);
410 if (unlikely(!ios))
411 return -ENOMEM;
412
413 ios->layout = objio_seg;
414 ios->ol_state.ioerrs = ((void *)ios) + first_size;
415 ios->ol_state.num_comps = objio_seg->num_comps;
416
417 *outp = &ios->ol_state;
418 return 0;
419}
420
421void objio_free_io_state(struct objlayout_io_state *ol_state)
422{
423 struct objio_state *ios = container_of(ol_state, struct objio_state,
424 ol_state);
425
426 kfree(ios);
427}
428
429enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep)
430{
431 switch (oep) {
432 case OSD_ERR_PRI_NO_ERROR:
433 return (enum pnfs_osd_errno)0;
434
435 case OSD_ERR_PRI_CLEAR_PAGES:
436 BUG_ON(1);
437 return 0;
438
439 case OSD_ERR_PRI_RESOURCE:
440 return PNFS_OSD_ERR_RESOURCE;
441 case OSD_ERR_PRI_BAD_CRED:
442 return PNFS_OSD_ERR_BAD_CRED;
443 case OSD_ERR_PRI_NO_ACCESS:
444 return PNFS_OSD_ERR_NO_ACCESS;
445 case OSD_ERR_PRI_UNREACHABLE:
446 return PNFS_OSD_ERR_UNREACHABLE;
447 case OSD_ERR_PRI_NOT_FOUND:
448 return PNFS_OSD_ERR_NOT_FOUND;
449 case OSD_ERR_PRI_NO_SPACE:
450 return PNFS_OSD_ERR_NO_SPACE;
451 default:
452 WARN_ON(1);
453 /* fallthrough */
454 case OSD_ERR_PRI_EIO:
455 return PNFS_OSD_ERR_EIO;
456 }
457}
458
459static void _clear_bio(struct bio *bio)
460{
461 struct bio_vec *bv;
462 unsigned i;
463
464 __bio_for_each_segment(bv, bio, i, 0) {
465 unsigned this_count = bv->bv_len;
466
467 if (likely(PAGE_SIZE == this_count))
468 clear_highpage(bv->bv_page);
469 else
470 zero_user(bv->bv_page, bv->bv_offset, this_count);
471 }
472}
473
474static int _io_check(struct objio_state *ios, bool is_write)
475{
476 enum osd_err_priority oep = OSD_ERR_PRI_NO_ERROR;
477 int lin_ret = 0;
478 int i;
479
480 for (i = 0; i < ios->numdevs; i++) {
481 struct osd_sense_info osi;
482 struct osd_request *or = ios->per_dev[i].or;
483 unsigned dev;
484 int ret;
485
486 if (!or)
487 continue;
488
489 ret = osd_req_decode_sense(or, &osi);
490 if (likely(!ret))
491 continue;
492
493 if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
494 /* start read offset passed endof file */
495 BUG_ON(is_write);
496 _clear_bio(ios->per_dev[i].bio);
497 dprintk("%s: start read offset passed end of file "
498 "offset=0x%llx, length=0x%lx\n", __func__,
499 _LLU(ios->per_dev[i].offset),
500 ios->per_dev[i].length);
501
502 continue; /* we recovered */
503 }
504 dev = ios->per_dev[i].dev;
505 objlayout_io_set_result(&ios->ol_state, dev,
506 &ios->layout->comps[dev].oc_object_id,
507 osd_pri_2_pnfs_err(osi.osd_err_pri),
508 ios->per_dev[i].offset,
509 ios->per_dev[i].length,
510 is_write);
511
512 if (osi.osd_err_pri >= oep) {
513 oep = osi.osd_err_pri;
514 lin_ret = ret;
515 }
516 }
517
518 return lin_ret;
519}
520
521/*
522 * Common IO state helpers.
523 */
524static void _io_free(struct objio_state *ios)
525{
526 unsigned i;
527
528 for (i = 0; i < ios->numdevs; i++) {
529 struct _objio_per_comp *per_dev = &ios->per_dev[i];
530
531 if (per_dev->or) {
532 osd_end_request(per_dev->or);
533 per_dev->or = NULL;
534 }
535
536 if (per_dev->bio) {
537 bio_put(per_dev->bio);
538 per_dev->bio = NULL;
539 }
540 }
541}
542
543struct osd_dev *_io_od(struct objio_state *ios, unsigned dev)
544{
545 unsigned min_dev = ios->layout->comps_index;
546 unsigned max_dev = min_dev + ios->layout->num_comps;
547
548 BUG_ON(dev < min_dev || max_dev <= dev);
549 return ios->layout->ods[dev - min_dev]->od;
550}
551
552struct _striping_info {
553 u64 obj_offset;
554 u64 group_length;
555 unsigned dev;
556 unsigned unit_off;
557};
558
559static void _calc_stripe_info(struct objio_state *ios, u64 file_offset,
560 struct _striping_info *si)
561{
562 u32 stripe_unit = ios->layout->stripe_unit;
563 u32 group_width = ios->layout->group_width;
564 u64 group_depth = ios->layout->group_depth;
565 u32 U = stripe_unit * group_width;
566
567 u64 T = U * group_depth;
568 u64 S = T * ios->layout->group_count;
569 u64 M = div64_u64(file_offset, S);
570
571 /*
572 G = (L - (M * S)) / T
573 H = (L - (M * S)) % T
574 */
575 u64 LmodU = file_offset - M * S;
576 u32 G = div64_u64(LmodU, T);
577 u64 H = LmodU - G * T;
578
579 u32 N = div_u64(H, U);
580
581 div_u64_rem(file_offset, stripe_unit, &si->unit_off);
582 si->obj_offset = si->unit_off + (N * stripe_unit) +
583 (M * group_depth * stripe_unit);
584
585 /* "H - (N * U)" is just "H % U" so it's bound to u32 */
586 si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
587 si->dev *= ios->layout->mirrors_p1;
588
589 si->group_length = T - H;
590}
591
592static int _add_stripe_unit(struct objio_state *ios, unsigned *cur_pg,
593 unsigned pgbase, struct _objio_per_comp *per_dev, int cur_len,
594 gfp_t gfp_flags)
595{
596 unsigned pg = *cur_pg;
597 struct request_queue *q =
598 osd_request_queue(_io_od(ios, per_dev->dev));
599
600 per_dev->length += cur_len;
601
602 if (per_dev->bio == NULL) {
603 unsigned stripes = ios->layout->num_comps /
604 ios->layout->mirrors_p1;
605 unsigned pages_in_stripe = stripes *
606 (ios->layout->stripe_unit / PAGE_SIZE);
607 unsigned bio_size = (ios->ol_state.nr_pages + pages_in_stripe) /
608 stripes;
609
610 if (BIO_MAX_PAGES_KMALLOC < bio_size)
611 bio_size = BIO_MAX_PAGES_KMALLOC;
612
613 per_dev->bio = bio_kmalloc(gfp_flags, bio_size);
614 if (unlikely(!per_dev->bio)) {
615 dprintk("Faild to allocate BIO size=%u\n", bio_size);
616 return -ENOMEM;
617 }
618 }
619
620 while (cur_len > 0) {
621 unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
622 unsigned added_len;
623
624 BUG_ON(ios->ol_state.nr_pages <= pg);
625 cur_len -= pglen;
626
627 added_len = bio_add_pc_page(q, per_dev->bio,
628 ios->ol_state.pages[pg], pglen, pgbase);
629 if (unlikely(pglen != added_len))
630 return -ENOMEM;
631 pgbase = 0;
632 ++pg;
633 }
634 BUG_ON(cur_len);
635
636 *cur_pg = pg;
637 return 0;
638}
639
640static int _prepare_one_group(struct objio_state *ios, u64 length,
641 struct _striping_info *si, unsigned *last_pg,
642 gfp_t gfp_flags)
643{
644 unsigned stripe_unit = ios->layout->stripe_unit;
645 unsigned mirrors_p1 = ios->layout->mirrors_p1;
646 unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
647 unsigned dev = si->dev;
648 unsigned first_dev = dev - (dev % devs_in_group);
649 unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
650 unsigned cur_pg = *last_pg;
651 int ret = 0;
652
653 while (length) {
654 struct _objio_per_comp *per_dev = &ios->per_dev[dev];
655 unsigned cur_len, page_off = 0;
656
657 if (!per_dev->length) {
658 per_dev->dev = dev;
659 if (dev < si->dev) {
660 per_dev->offset = si->obj_offset + stripe_unit -
661 si->unit_off;
662 cur_len = stripe_unit;
663 } else if (dev == si->dev) {
664 per_dev->offset = si->obj_offset;
665 cur_len = stripe_unit - si->unit_off;
666 page_off = si->unit_off & ~PAGE_MASK;
667 BUG_ON(page_off &&
668 (page_off != ios->ol_state.pgbase));
669 } else { /* dev > si->dev */
670 per_dev->offset = si->obj_offset - si->unit_off;
671 cur_len = stripe_unit;
672 }
673
674 if (max_comp < dev)
675 max_comp = dev;
676 } else {
677 cur_len = stripe_unit;
678 }
679 if (cur_len >= length)
680 cur_len = length;
681
682 ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
683 cur_len, gfp_flags);
684 if (unlikely(ret))
685 goto out;
686
687 dev += mirrors_p1;
688 dev = (dev % devs_in_group) + first_dev;
689
690 length -= cur_len;
691 ios->length += cur_len;
692 }
693out:
694 ios->numdevs = max_comp + mirrors_p1;
695 *last_pg = cur_pg;
696 return ret;
697}
698
699static int _io_rw_pagelist(struct objio_state *ios, gfp_t gfp_flags)
700{
701 u64 length = ios->ol_state.count;
702 u64 offset = ios->ol_state.offset;
703 struct _striping_info si;
704 unsigned last_pg = 0;
705 int ret = 0;
706
707 while (length) {
708 _calc_stripe_info(ios, offset, &si);
709
710 if (length < si.group_length)
711 si.group_length = length;
712
713 ret = _prepare_one_group(ios, si.group_length, &si, &last_pg, gfp_flags);
714 if (unlikely(ret))
715 goto out;
716
717 offset += si.group_length;
718 length -= si.group_length;
719 }
720
721out:
722 if (!ios->length)
723 return ret;
724
725 return 0;
726}
727
728static ssize_t _sync_done(struct objio_state *ios)
729{
730 struct completion *waiting = ios->private;
731
732 complete(waiting);
733 return 0;
734}
735
736static void _last_io(struct kref *kref)
737{
738 struct objio_state *ios = container_of(kref, struct objio_state, kref);
739
740 ios->done(ios);
741}
742
743static void _done_io(struct osd_request *or, void *p)
744{
745 struct objio_state *ios = p;
746
747 kref_put(&ios->kref, _last_io);
748}
749
750static ssize_t _io_exec(struct objio_state *ios)
751{
752 DECLARE_COMPLETION_ONSTACK(wait);
753 ssize_t status = 0; /* sync status */
754 unsigned i;
755 objio_done_fn saved_done_fn = ios->done;
756 bool sync = ios->ol_state.sync;
757
758 if (sync) {
759 ios->done = _sync_done;
760 ios->private = &wait;
761 }
762
763 kref_init(&ios->kref);
764
765 for (i = 0; i < ios->numdevs; i++) {
766 struct osd_request *or = ios->per_dev[i].or;
767
768 if (!or)
769 continue;
770
771 kref_get(&ios->kref);
772 osd_execute_request_async(or, _done_io, ios);
773 }
774
775 kref_put(&ios->kref, _last_io);
776
777 if (sync) {
778 wait_for_completion(&wait);
779 status = saved_done_fn(ios);
780 }
781
782 return status;
783}
784
785/*
786 * read
787 */
788static ssize_t _read_done(struct objio_state *ios)
789{
790 ssize_t status;
791 int ret = _io_check(ios, false);
792
793 _io_free(ios);
794
795 if (likely(!ret))
796 status = ios->length;
797 else
798 status = ret;
799
800 objlayout_read_done(&ios->ol_state, status, ios->ol_state.sync);
801 return status;
802}
803
804static int _read_mirrors(struct objio_state *ios, unsigned cur_comp)
805{
806 struct osd_request *or = NULL;
807 struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
808 unsigned dev = per_dev->dev;
809 struct pnfs_osd_object_cred *cred =
810 &ios->layout->comps[dev];
811 struct osd_obj_id obj = {
812 .partition = cred->oc_object_id.oid_partition_id,
813 .id = cred->oc_object_id.oid_object_id,
814 };
815 int ret;
816
817 or = osd_start_request(_io_od(ios, dev), GFP_KERNEL);
818 if (unlikely(!or)) {
819 ret = -ENOMEM;
820 goto err;
821 }
822 per_dev->or = or;
823
824 osd_req_read(or, &obj, per_dev->offset, per_dev->bio, per_dev->length);
825
826 ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL);
827 if (ret) {
828 dprintk("%s: Faild to osd_finalize_request() => %d\n",
829 __func__, ret);
830 goto err;
831 }
832
833 dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
834 __func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
835 per_dev->length);
836
837err:
838 return ret;
839}
840
841static ssize_t _read_exec(struct objio_state *ios)
842{
843 unsigned i;
844 int ret;
845
846 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
847 if (!ios->per_dev[i].length)
848 continue;
849 ret = _read_mirrors(ios, i);
850 if (unlikely(ret))
851 goto err;
852 }
853
854 ios->done = _read_done;
855 return _io_exec(ios); /* In sync mode exec returns the io status */
856
857err:
858 _io_free(ios);
859 return ret;
860}
861
862ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state)
863{
864 struct objio_state *ios = container_of(ol_state, struct objio_state,
865 ol_state);
866 int ret;
867
868 ret = _io_rw_pagelist(ios, GFP_KERNEL);
869 if (unlikely(ret))
870 return ret;
871
872 return _read_exec(ios);
873}
874
875/*
876 * write
877 */
878static ssize_t _write_done(struct objio_state *ios)
879{
880 ssize_t status;
881 int ret = _io_check(ios, true);
882
883 _io_free(ios);
884
885 if (likely(!ret)) {
886 /* FIXME: should be based on the OSD's persistence model
887 * See OSD2r05 Section 4.13 Data persistence model */
888 ios->ol_state.committed = NFS_FILE_SYNC;
889 status = ios->length;
890 } else {
891 status = ret;
892 }
893
894 objlayout_write_done(&ios->ol_state, status, ios->ol_state.sync);
895 return status;
896}
897
898static int _write_mirrors(struct objio_state *ios, unsigned cur_comp)
899{
900 struct _objio_per_comp *master_dev = &ios->per_dev[cur_comp];
901 unsigned dev = ios->per_dev[cur_comp].dev;
902 unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
903 int ret;
904
905 for (; cur_comp < last_comp; ++cur_comp, ++dev) {
906 struct osd_request *or = NULL;
907 struct pnfs_osd_object_cred *cred =
908 &ios->layout->comps[dev];
909 struct osd_obj_id obj = {
910 .partition = cred->oc_object_id.oid_partition_id,
911 .id = cred->oc_object_id.oid_object_id,
912 };
913 struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
914 struct bio *bio;
915
916 or = osd_start_request(_io_od(ios, dev), GFP_NOFS);
917 if (unlikely(!or)) {
918 ret = -ENOMEM;
919 goto err;
920 }
921 per_dev->or = or;
922
923 if (per_dev != master_dev) {
924 bio = bio_kmalloc(GFP_NOFS,
925 master_dev->bio->bi_max_vecs);
926 if (unlikely(!bio)) {
927 dprintk("Faild to allocate BIO size=%u\n",
928 master_dev->bio->bi_max_vecs);
929 ret = -ENOMEM;
930 goto err;
931 }
932
933 __bio_clone(bio, master_dev->bio);
934 bio->bi_bdev = NULL;
935 bio->bi_next = NULL;
936 per_dev->bio = bio;
937 per_dev->dev = dev;
938 per_dev->length = master_dev->length;
939 per_dev->offset = master_dev->offset;
940 } else {
941 bio = master_dev->bio;
942 bio->bi_rw |= REQ_WRITE;
943 }
944
945 osd_req_write(or, &obj, per_dev->offset, bio, per_dev->length);
946
947 ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL);
948 if (ret) {
949 dprintk("%s: Faild to osd_finalize_request() => %d\n",
950 __func__, ret);
951 goto err;
952 }
953
954 dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
955 __func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
956 per_dev->length);
957 }
958
959err:
960 return ret;
961}
962
963static ssize_t _write_exec(struct objio_state *ios)
964{
965 unsigned i;
966 int ret;
967
968 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
969 if (!ios->per_dev[i].length)
970 continue;
971 ret = _write_mirrors(ios, i);
972 if (unlikely(ret))
973 goto err;
974 }
975
976 ios->done = _write_done;
977 return _io_exec(ios); /* In sync mode exec returns the io->status */
978
979err:
980 _io_free(ios);
981 return ret;
982}
983
984ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
985{
986 struct objio_state *ios = container_of(ol_state, struct objio_state,
987 ol_state);
988 int ret;
989
990 /* TODO: ios->stable = stable; */
991 ret = _io_rw_pagelist(ios, GFP_NOFS);
992 if (unlikely(ret))
993 return ret;
994
995 return _write_exec(ios);
996}
997
998static bool objio_pg_test(struct nfs_pageio_descriptor *pgio,
999 struct nfs_page *prev, struct nfs_page *req)
1000{
1001 if (!pnfs_generic_pg_test(pgio, prev, req))
1002 return false;
1003
1004 return pgio->pg_count + req->wb_bytes <=
1005 OBJIO_LSEG(pgio->pg_lseg)->max_io_size;
1006}
1007
1008static struct pnfs_layoutdriver_type objlayout_type = {
1009 .id = LAYOUT_OSD2_OBJECTS,
1010 .name = "LAYOUT_OSD2_OBJECTS",
1011 .flags = PNFS_LAYOUTRET_ON_SETATTR,
1012
1013 .alloc_layout_hdr = objlayout_alloc_layout_hdr,
1014 .free_layout_hdr = objlayout_free_layout_hdr,
1015
1016 .alloc_lseg = objlayout_alloc_lseg,
1017 .free_lseg = objlayout_free_lseg,
1018
1019 .read_pagelist = objlayout_read_pagelist,
1020 .write_pagelist = objlayout_write_pagelist,
1021 .pg_test = objio_pg_test,
1022
1023 .free_deviceid_node = objio_free_deviceid_node,
1024
1025 .encode_layoutcommit = objlayout_encode_layoutcommit,
1026 .encode_layoutreturn = objlayout_encode_layoutreturn,
1027};
1028
1029MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
1030MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>");
1031MODULE_LICENSE("GPL");
1032
1033static int __init
1034objlayout_init(void)
1035{
1036 int ret = pnfs_register_layoutdriver(&objlayout_type);
1037
1038 if (ret)
1039 printk(KERN_INFO
1040 "%s: Registering OSD pNFS Layout Driver failed: error=%d\n",
1041 __func__, ret);
1042 else
1043 printk(KERN_INFO "%s: Registered OSD pNFS Layout Driver\n",
1044 __func__);
1045 return ret;
1046}
1047
1048static void __exit
1049objlayout_exit(void)
1050{
1051 pnfs_unregister_layoutdriver(&objlayout_type);
1052 printk(KERN_INFO "%s: Unregistered OSD pNFS Layout Driver\n",
1053 __func__);
1054}
1055
1056module_init(objlayout_init);
1057module_exit(objlayout_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-21 02:48:23 -0400