fs/nfs/objlayout/objlayout.c

   1 /*
   2  *  pNFS Objects layout driver high level definitions
   3  *
   4  *  Copyright (C) 2007 Panasas Inc. [year of first publication]
   5  *  All rights reserved.
   6  *
   7  *  Benny Halevy <bhalevy@panasas.com>
   8  *  Boaz Harrosh <ooo@electrozaur.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/kmod.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/ratelimit.h>
  43 #include <scsi/osd_initiator.h>
  44 #include "objlayout.h"
  45
  46 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  47 /*
  48  * Create a objlayout layout structure for the given inode and return it.
  49  */
  50 struct pnfs_layout_hdr *
  51 objlayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
  52 {
  53         struct objlayout *objlay;
  54
  55         objlay = kzalloc(sizeof(struct objlayout), gfp_flags);
  56         if (!objlay)
  57                 return NULL;
  58         spin_lock_init(&objlay->lock);
  59         INIT_LIST_HEAD(&objlay->err_list);
  60         dprintk("%s: Return %p\n", __func__, objlay);
  61         return &objlay->pnfs_layout;
  62 }
  63
  64 /*
  65  * Free an objlayout layout structure
  66  */
  67 void
  68 objlayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
  69 {
  70         struct objlayout *objlay = OBJLAYOUT(lo);
  71
  72         dprintk("%s: objlay %p\n", __func__, objlay);
  73
  74         WARN_ON(!list_empty(&objlay->err_list));
  75         kfree(objlay);
  76 }
  77
  78 /*
  79  * Unmarshall layout and store it in pnfslay.
  80  */
  81 struct pnfs_layout_segment *
  82 objlayout_alloc_lseg(struct pnfs_layout_hdr *pnfslay,
  83                      struct nfs4_layoutget_res *lgr,
  84                      gfp_t gfp_flags)
  85 {
  86         int status = -ENOMEM;
  87         struct xdr_stream stream;
  88         struct xdr_buf buf = {
  89                 .pages =  lgr->layoutp->pages,
  90                 .page_len =  lgr->layoutp->len,
  91                 .buflen =  lgr->layoutp->len,
  92                 .len = lgr->layoutp->len,
  93         };
  94         struct page *scratch;
  95         struct pnfs_layout_segment *lseg;
  96
  97         dprintk("%s: Begin pnfslay %p\n", __func__, pnfslay);
  98
  99         scratch = alloc_page(gfp_flags);
 100         if (!scratch)
 101                 goto err_nofree;
 102
 103         xdr_init_decode(&stream, &buf, NULL);
 104         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 105
 106         status = objio_alloc_lseg(&lseg, pnfslay, &lgr->range, &stream, gfp_flags);
 107         if (unlikely(status)) {
 108                 dprintk("%s: objio_alloc_lseg Return err %d\n", __func__,
 109                         status);
 110                 goto err;
 111         }
 112
 113         __free_page(scratch);
 114
 115         dprintk("%s: Return %p\n", __func__, lseg);
 116         return lseg;
 117
 118 err:
 119         __free_page(scratch);
 120 err_nofree:
 121         dprintk("%s: Err Return=>%d\n", __func__, status);
 122         return ERR_PTR(status);
 123 }
 124
 125 /*
 126  * Free a layout segement
 127  */
 128 void
 129 objlayout_free_lseg(struct pnfs_layout_segment *lseg)
 130 {
 131         dprintk("%s: freeing layout segment %p\n", __func__, lseg);
 132
 133         if (unlikely(!lseg))
 134                 return;
 135
 136         objio_free_lseg(lseg);
 137 }
 138
 139 /*
 140  * I/O Operations
 141  */
 142 static inline u64
 143 end_offset(u64 start, u64 len)
 144 {
 145         u64 end;
 146
 147         end = start + len;
 148         return end >= start ? end : NFS4_MAX_UINT64;
 149 }
 150
 151 static void _fix_verify_io_params(struct pnfs_layout_segment *lseg,
 152                            struct page ***p_pages, unsigned *p_pgbase,
 153                            u64 offset, unsigned long count)
 154 {
 155         u64 lseg_end_offset;
 156
 157         BUG_ON(offset < lseg->pls_range.offset);
 158         lseg_end_offset = end_offset(lseg->pls_range.offset,
 159                                      lseg->pls_range.length);
 160         BUG_ON(offset >= lseg_end_offset);
 161         WARN_ON(offset + count > lseg_end_offset);
 162
 163         if (*p_pgbase > PAGE_SIZE) {
 164                 dprintk("%s: pgbase(0x%x) > PAGE_SIZE\n", __func__, *p_pgbase);
 165                 *p_pages += *p_pgbase >> PAGE_SHIFT;
 166                 *p_pgbase &= ~PAGE_MASK;
 167         }
 168 }
 169
 170 /*
 171  * I/O done common code
 172  */
 173 static void
 174 objlayout_iodone(struct objlayout_io_res *oir)
 175 {
 176         if (likely(oir->status >= 0)) {
 177                 objio_free_result(oir);
 178         } else {
 179                 struct objlayout *objlay = oir->objlay;
 180
 181                 spin_lock(&objlay->lock);
 182                 objlay->delta_space_valid = OBJ_DSU_INVALID;
 183                 list_add(&objlay->err_list, &oir->err_list);
 184                 spin_unlock(&objlay->lock);
 185         }
 186 }
 187
 188 /*
 189  * objlayout_io_set_result - Set an osd_error code on a specific osd comp.
 190  *
 191  * The @index component IO failed (error returned from target). Register
 192  * the error for later reporting at layout-return.
 193  */
 194 void
 195 objlayout_io_set_result(struct objlayout_io_res *oir, unsigned index,
 196                         struct pnfs_osd_objid *pooid, int osd_error,
 197                         u64 offset, u64 length, bool is_write)
 198 {
 199         struct pnfs_osd_ioerr *ioerr = &oir->ioerrs[index];
 200
 201         BUG_ON(index >= oir->num_comps);
 202         if (osd_error) {
 203                 ioerr->oer_component = *pooid;
 204                 ioerr->oer_comp_offset = offset;
 205                 ioerr->oer_comp_length = length;
 206                 ioerr->oer_iswrite = is_write;
 207                 ioerr->oer_errno = osd_error;
 208
 209                 dprintk("%s: err[%d]: errno=%d is_write=%d dev(%llx:%llx) "
 210                         "par=0x%llx obj=0x%llx offset=0x%llx length=0x%llx\n",
 211                         __func__, index, ioerr->oer_errno,
 212                         ioerr->oer_iswrite,
 213                         _DEVID_LO(&ioerr->oer_component.oid_device_id),
 214                         _DEVID_HI(&ioerr->oer_component.oid_device_id),
 215                         ioerr->oer_component.oid_partition_id,
 216                         ioerr->oer_component.oid_object_id,
 217                         ioerr->oer_comp_offset,
 218                         ioerr->oer_comp_length);
 219         } else {
 220                 /* User need not call if no error is reported */
 221                 ioerr->oer_errno = 0;
 222         }
 223 }
 224
 225 /* Function scheduled on rpc workqueue to call ->nfs_readlist_complete().
 226  * This is because the osd completion is called with ints-off from
 227  * the block layer
 228  */
 229 static void _rpc_read_complete(struct work_struct *work)
 230 {
 231         struct rpc_task *task;
 232         struct nfs_pgio_header *hdr;
 233
 234         dprintk("%s enter\n", __func__);
 235         task = container_of(work, struct rpc_task, u.tk_work);
 236         hdr = container_of(task, struct nfs_pgio_header, task);
 237
 238         pnfs_ld_read_done(hdr);
 239 }
 240
 241 void
 242 objlayout_read_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
 243 {
 244         struct nfs_pgio_header *hdr = oir->rpcdata;
 245
 246         oir->status = hdr->task.tk_status = status;
 247         if (status >= 0)
 248                 hdr->res.count = status;
 249         else
 250                 hdr->pnfs_error = status;
 251         objlayout_iodone(oir);
 252         /* must not use oir after this point */
 253
 254         dprintk("%s: Return status=%zd eof=%d sync=%d\n", __func__,
 255                 status, hdr->res.eof, sync);
 256
 257         if (sync)
 258                 pnfs_ld_read_done(hdr);
 259         else {
 260                 INIT_WORK(&hdr->task.u.tk_work, _rpc_read_complete);
 261                 schedule_work(&hdr->task.u.tk_work);
 262         }
 263 }
 264
 265 /*
 266  * Perform sync or async reads.
 267  */
 268 enum pnfs_try_status
 269 objlayout_read_pagelist(struct nfs_pgio_header *hdr)
 270 {
 271         struct inode *inode = hdr->inode;
 272         loff_t offset = hdr->args.offset;
 273         size_t count = hdr->args.count;
 274         int err;
 275         loff_t eof;
 276
 277         eof = i_size_read(inode);
 278         if (unlikely(offset + count > eof)) {
 279                 if (offset >= eof) {
 280                         err = 0;
 281                         hdr->res.count = 0;
 282                         hdr->res.eof = 1;
 283                         /*FIXME: do we need to call pnfs_ld_read_done() */
 284                         goto out;
 285                 }
 286                 count = eof - offset;
 287         }
 288
 289         hdr->res.eof = (offset + count) >= eof;
 290         _fix_verify_io_params(hdr->lseg, &hdr->args.pages,
 291                               &hdr->args.pgbase,
 292                               hdr->args.offset, hdr->args.count);
 293
 294         dprintk("%s: inode(%lx) offset 0x%llx count 0x%Zx eof=%d\n",
 295                 __func__, inode->i_ino, offset, count, hdr->res.eof);
 296
 297         err = objio_read_pagelist(hdr);
 298  out:
 299         if (unlikely(err)) {
 300                 hdr->pnfs_error = err;
 301                 dprintk("%s: Returned Error %d\n", __func__, err);
 302                 return PNFS_NOT_ATTEMPTED;
 303         }
 304         return PNFS_ATTEMPTED;
 305 }
 306
 307 /* Function scheduled on rpc workqueue to call ->nfs_writelist_complete().
 308  * This is because the osd completion is called with ints-off from
 309  * the block layer
 310  */
 311 static void _rpc_write_complete(struct work_struct *work)
 312 {
 313         struct rpc_task *task;
 314         struct nfs_pgio_header *hdr;
 315
 316         dprintk("%s enter\n", __func__);
 317         task = container_of(work, struct rpc_task, u.tk_work);
 318         hdr = container_of(task, struct nfs_pgio_header, task);
 319
 320         pnfs_ld_write_done(hdr);
 321 }
 322
 323 void
 324 objlayout_write_done(struct objlayout_io_res *oir, ssize_t status, bool sync)
 325 {
 326         struct nfs_pgio_header *hdr = oir->rpcdata;
 327
 328         oir->status = hdr->task.tk_status = status;
 329         if (status >= 0) {
 330                 hdr->res.count = status;
 331                 hdr->verf.committed = oir->committed;
 332         } else {
 333                 hdr->pnfs_error = status;
 334         }
 335         objlayout_iodone(oir);
 336         /* must not use oir after this point */
 337
 338         dprintk("%s: Return status %zd committed %d sync=%d\n", __func__,
 339                 status, hdr->verf.committed, sync);
 340
 341         if (sync)
 342                 pnfs_ld_write_done(hdr);
 343         else {
 344                 INIT_WORK(&hdr->task.u.tk_work, _rpc_write_complete);
 345                 schedule_work(&hdr->task.u.tk_work);
 346         }
 347 }
 348
 349 /*
 350  * Perform sync or async writes.
 351  */
 352 enum pnfs_try_status
 353 objlayout_write_pagelist(struct nfs_pgio_header *hdr, int how)
 354 {
 355         int err;
 356
 357         _fix_verify_io_params(hdr->lseg, &hdr->args.pages,
 358                               &hdr->args.pgbase,
 359                               hdr->args.offset, hdr->args.count);
 360
 361         err = objio_write_pagelist(hdr, how);
 362         if (unlikely(err)) {
 363                 hdr->pnfs_error = err;
 364                 dprintk("%s: Returned Error %d\n", __func__, err);
 365                 return PNFS_NOT_ATTEMPTED;
 366         }
 367         return PNFS_ATTEMPTED;
 368 }
 369
 370 void
 371 objlayout_encode_layoutcommit(struct pnfs_layout_hdr *pnfslay,
 372                               struct xdr_stream *xdr,
 373                               const struct nfs4_layoutcommit_args *args)
 374 {
 375         struct objlayout *objlay = OBJLAYOUT(pnfslay);
 376         struct pnfs_osd_layoutupdate lou;
 377         __be32 *start;
 378
 379         dprintk("%s: Begin\n", __func__);
 380
 381         spin_lock(&objlay->lock);
 382         lou.dsu_valid = (objlay->delta_space_valid == OBJ_DSU_VALID);
 383         lou.dsu_delta = objlay->delta_space_used;
 384         objlay->delta_space_used = 0;
 385         objlay->delta_space_valid = OBJ_DSU_INIT;
 386         lou.olu_ioerr_flag = !list_empty(&objlay->err_list);
 387         spin_unlock(&objlay->lock);
 388
 389         start = xdr_reserve_space(xdr, 4);
 390
 391         BUG_ON(pnfs_osd_xdr_encode_layoutupdate(xdr, &lou));
 392
 393         *start = cpu_to_be32((xdr->p - start - 1) * 4);
 394
 395         dprintk("%s: Return delta_space_used %lld err %d\n", __func__,
 396                 lou.dsu_delta, lou.olu_ioerr_flag);
 397 }
 398
 399 static int
 400 err_prio(u32 oer_errno)
 401 {
 402         switch (oer_errno) {
 403         case 0:
 404                 return 0;
 405
 406         case PNFS_OSD_ERR_RESOURCE:
 407                 return OSD_ERR_PRI_RESOURCE;
 408         case PNFS_OSD_ERR_BAD_CRED:
 409                 return OSD_ERR_PRI_BAD_CRED;
 410         case PNFS_OSD_ERR_NO_ACCESS:
 411                 return OSD_ERR_PRI_NO_ACCESS;
 412         case PNFS_OSD_ERR_UNREACHABLE:
 413                 return OSD_ERR_PRI_UNREACHABLE;
 414         case PNFS_OSD_ERR_NOT_FOUND:
 415                 return OSD_ERR_PRI_NOT_FOUND;
 416         case PNFS_OSD_ERR_NO_SPACE:
 417                 return OSD_ERR_PRI_NO_SPACE;
 418         default:
 419                 WARN_ON(1);
 420                 /* fallthrough */
 421         case PNFS_OSD_ERR_EIO:
 422                 return OSD_ERR_PRI_EIO;
 423         }
 424 }
 425
 426 static void
 427 merge_ioerr(struct pnfs_osd_ioerr *dest_err,
 428             const struct pnfs_osd_ioerr *src_err)
 429 {
 430         u64 dest_end, src_end;
 431
 432         if (!dest_err->oer_errno) {
 433                 *dest_err = *src_err;
 434                 /* accumulated device must be blank */
 435                 memset(&dest_err->oer_component.oid_device_id, 0,
 436                         sizeof(dest_err->oer_component.oid_device_id));
 437
 438                 return;
 439         }
 440
 441         if (dest_err->oer_component.oid_partition_id !=
 442                                 src_err->oer_component.oid_partition_id)
 443                 dest_err->oer_component.oid_partition_id = 0;
 444
 445         if (dest_err->oer_component.oid_object_id !=
 446                                 src_err->oer_component.oid_object_id)
 447                 dest_err->oer_component.oid_object_id = 0;
 448
 449         if (dest_err->oer_comp_offset > src_err->oer_comp_offset)
 450                 dest_err->oer_comp_offset = src_err->oer_comp_offset;
 451
 452         dest_end = end_offset(dest_err->oer_comp_offset,
 453                               dest_err->oer_comp_length);
 454         src_end =  end_offset(src_err->oer_comp_offset,
 455                               src_err->oer_comp_length);
 456         if (dest_end < src_end)
 457                 dest_end = src_end;
 458
 459         dest_err->oer_comp_length = dest_end - dest_err->oer_comp_offset;
 460
 461         if ((src_err->oer_iswrite == dest_err->oer_iswrite) &&
 462             (err_prio(src_err->oer_errno) > err_prio(dest_err->oer_errno))) {
 463                         dest_err->oer_errno = src_err->oer_errno;
 464         } else if (src_err->oer_iswrite) {
 465                 dest_err->oer_iswrite = true;
 466                 dest_err->oer_errno = src_err->oer_errno;
 467         }
 468 }
 469
 470 static void
 471 encode_accumulated_error(struct objlayout *objlay, __be32 *p)
 472 {
 473         struct objlayout_io_res *oir, *tmp;
 474         struct pnfs_osd_ioerr accumulated_err = {.oer_errno = 0};
 475
 476         list_for_each_entry_safe(oir, tmp, &objlay->err_list, err_list) {
 477                 unsigned i;
 478
 479                 for (i = 0; i < oir->num_comps; i++) {
 480                         struct pnfs_osd_ioerr *ioerr = &oir->ioerrs[i];
 481
 482                         if (!ioerr->oer_errno)
 483                                 continue;
 484
 485                         printk(KERN_ERR "NFS: %s: err[%d]: errno=%d "
 486                                 "is_write=%d dev(%llx:%llx) par=0x%llx "
 487                                 "obj=0x%llx offset=0x%llx length=0x%llx\n",
 488                                 __func__, i, ioerr->oer_errno,
 489                                 ioerr->oer_iswrite,
 490                                 _DEVID_LO(&ioerr->oer_component.oid_device_id),
 491                                 _DEVID_HI(&ioerr->oer_component.oid_device_id),
 492                                 ioerr->oer_component.oid_partition_id,
 493                                 ioerr->oer_component.oid_object_id,
 494                                 ioerr->oer_comp_offset,
 495                                 ioerr->oer_comp_length);
 496
 497                         merge_ioerr(&accumulated_err, ioerr);
 498                 }
 499                 list_del(&oir->err_list);
 500                 objio_free_result(oir);
 501         }
 502
 503         pnfs_osd_xdr_encode_ioerr(p, &accumulated_err);
 504 }
 505
 506 void
 507 objlayout_encode_layoutreturn(struct pnfs_layout_hdr *pnfslay,
 508                               struct xdr_stream *xdr,
 509                               const struct nfs4_layoutreturn_args *args)
 510 {
 511         struct objlayout *objlay = OBJLAYOUT(pnfslay);
 512         struct objlayout_io_res *oir, *tmp;
 513         __be32 *start;
 514
 515         dprintk("%s: Begin\n", __func__);
 516         start = xdr_reserve_space(xdr, 4);
 517         BUG_ON(!start);
 518
 519         spin_lock(&objlay->lock);
 520
 521         list_for_each_entry_safe(oir, tmp, &objlay->err_list, err_list) {
 522                 __be32 *last_xdr = NULL, *p;
 523                 unsigned i;
 524                 int res = 0;
 525
 526                 for (i = 0; i < oir->num_comps; i++) {
 527                         struct pnfs_osd_ioerr *ioerr = &oir->ioerrs[i];
 528
 529                         if (!ioerr->oer_errno)
 530                                 continue;
 531
 532                         dprintk("%s: err[%d]: errno=%d is_write=%d "
 533                                 "dev(%llx:%llx) par=0x%llx obj=0x%llx "
 534                                 "offset=0x%llx length=0x%llx\n",
 535                                 __func__, i, ioerr->oer_errno,
 536                                 ioerr->oer_iswrite,
 537                                 _DEVID_LO(&ioerr->oer_component.oid_device_id),
 538                                 _DEVID_HI(&ioerr->oer_component.oid_device_id),
 539                                 ioerr->oer_component.oid_partition_id,
 540                                 ioerr->oer_component.oid_object_id,
 541                                 ioerr->oer_comp_offset,
 542                                 ioerr->oer_comp_length);
 543
 544                         p = pnfs_osd_xdr_ioerr_reserve_space(xdr);
 545                         if (unlikely(!p)) {
 546                                 res = -E2BIG;
 547                                 break; /* accumulated_error */
 548                         }
 549
 550                         last_xdr = p;
 551                         pnfs_osd_xdr_encode_ioerr(p, &oir->ioerrs[i]);
 552                 }
 553
 554                 /* TODO: use xdr_write_pages */
 555                 if (unlikely(res)) {
 556                         /* no space for even one error descriptor */
 557                         BUG_ON(!last_xdr);
 558
 559                         /* we've encountered a situation with lots and lots of
 560                          * errors and no space to encode them all. Use the last
 561                          * available slot to report the union of all the
 562                          * remaining errors.
 563                          */
 564                         encode_accumulated_error(objlay, last_xdr);
 565                         goto loop_done;
 566                 }
 567                 list_del(&oir->err_list);
 568                 objio_free_result(oir);
 569         }
 570 loop_done:
 571         spin_unlock(&objlay->lock);
 572
 573         *start = cpu_to_be32((xdr->p - start - 1) * 4);
 574         dprintk("%s: Return\n", __func__);
 575 }
 576
 577 enum {
 578         OBJLAYOUT_MAX_URI_LEN = 256, OBJLAYOUT_MAX_OSDNAME_LEN = 64,
 579         OBJLAYOUT_MAX_SYSID_HEX_LEN = OSD_SYSTEMID_LEN * 2 + 1,
 580         OSD_LOGIN_UPCALL_PATHLEN  = 256
 581 };
 582
 583 static char osd_login_prog[OSD_LOGIN_UPCALL_PATHLEN] = "/sbin/osd_login";
 584
 585 module_param_string(osd_login_prog, osd_login_prog, sizeof(osd_login_prog),
 586                     0600);
 587 MODULE_PARM_DESC(osd_login_prog, "Path to the osd_login upcall program");
 588
 589 struct __auto_login {
 590         char uri[OBJLAYOUT_MAX_URI_LEN];
 591         char osdname[OBJLAYOUT_MAX_OSDNAME_LEN];
 592         char systemid_hex[OBJLAYOUT_MAX_SYSID_HEX_LEN];
 593 };
 594
 595 static int __objlayout_upcall(struct __auto_login *login)
 596 {
 597         static char *envp[] = { "HOME=/",
 598                 "TERM=linux",
 599                 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 600                 NULL
 601         };
 602         char *argv[8];
 603         int ret;
 604
 605         if (unlikely(!osd_login_prog[0])) {
 606                 dprintk("%s: osd_login_prog is disabled\n", __func__);
 607                 return -EACCES;
 608         }
 609
 610         dprintk("%s uri: %s\n", __func__, login->uri);
 611         dprintk("%s osdname %s\n", __func__, login->osdname);
 612         dprintk("%s systemid_hex %s\n", __func__, login->systemid_hex);
 613
 614         argv[0] = (char *)osd_login_prog;
 615         argv[1] = "-u";
 616         argv[2] = login->uri;
 617         argv[3] = "-o";
 618         argv[4] = login->osdname;
 619         argv[5] = "-s";
 620         argv[6] = login->systemid_hex;
 621         argv[7] = NULL;
 622
 623         ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
 624         /*
 625          * Disable the upcall mechanism if we're getting an ENOENT or
 626          * EACCES error. The admin can re-enable it on the fly by using
 627          * sysfs to set the objlayoutdriver.osd_login_prog module parameter once
 628          * the problem has been fixed.
 629          */
 630         if (ret == -ENOENT || ret == -EACCES) {
 631                 printk(KERN_ERR "PNFS-OBJ: %s was not found please set "
 632                         "objlayoutdriver.osd_login_prog kernel parameter!\n",
 633                         osd_login_prog);
 634                 osd_login_prog[0] = '\0';
 635         }
 636         dprintk("%s %s return value: %d\n", __func__, osd_login_prog, ret);
 637
 638         return ret;
 639 }
 640
 641 /* Assume dest is all zeros */
 642 static void __copy_nfsS_and_zero_terminate(struct nfs4_string s,
 643                                            char *dest, int max_len,
 644                                            const char *var_name)
 645 {
 646         if (!s.len)
 647                 return;
 648
 649         if (s.len >= max_len) {
 650                 pr_warn_ratelimited(
 651                         "objlayout_autologin: %s: s.len(%d) >= max_len(%d)",
 652                         var_name, s.len, max_len);
 653                 s.len = max_len - 1; /* space for null terminator */
 654         }
 655
 656         memcpy(dest, s.data, s.len);
 657 }
 658
 659 /* Assume sysid is all zeros */
 660 static void _sysid_2_hex(struct nfs4_string s,
 661                   char sysid[OBJLAYOUT_MAX_SYSID_HEX_LEN])
 662 {
 663         int i;
 664         char *cur;
 665
 666         if (!s.len)
 667                 return;
 668
 669         if (s.len != OSD_SYSTEMID_LEN) {
 670                 pr_warn_ratelimited(
 671                     "objlayout_autologin: systemid_len(%d) != OSD_SYSTEMID_LEN",
 672                     s.len);
 673                 if (s.len > OSD_SYSTEMID_LEN)
 674                         s.len = OSD_SYSTEMID_LEN;
 675         }
 676
 677         cur = sysid;
 678         for (i = 0; i < s.len; i++)
 679                 cur = hex_byte_pack(cur, s.data[i]);
 680 }
 681
 682 int objlayout_autologin(struct pnfs_osd_deviceaddr *deviceaddr)
 683 {
 684         int rc;
 685         struct __auto_login login;
 686
 687         if (!deviceaddr->oda_targetaddr.ota_netaddr.r_addr.len)
 688                 return -ENODEV;
 689
 690         memset(&login, 0, sizeof(login));
 691         __copy_nfsS_and_zero_terminate(
 692                 deviceaddr->oda_targetaddr.ota_netaddr.r_addr,
 693                 login.uri, sizeof(login.uri), "URI");
 694
 695         __copy_nfsS_and_zero_terminate(
 696                 deviceaddr->oda_osdname,
 697                 login.osdname, sizeof(login.osdname), "OSDNAME");
 698
 699         _sysid_2_hex(deviceaddr->oda_systemid, login.systemid_hex);
 700
 701         rc = __objlayout_upcall(&login);
 702         if (rc > 0) /* script returns positive values */
 703                 rc = -ENODEV;
 704
 705         return rc;
 706 }