fs/nfs/objlayout/objio_osd.c

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