src/afs/afs_bypasscache.c

   1 /*
   2  * COPYRIGHT  ©  2000
   3  * THE REGENTS OF THE UNIVERSITY OF MICHIGAN
   4  * ALL RIGHTS RESERVED
   5  *
   6  * Permission is granted to use, copy, create derivative works
   7  * and redistribute this software and such derivative works
   8  * for any purpose, so long as the name of The University of
   9  * Michigan is not used in any advertising or publicity
  10  * pertaining to the use of distribution of this software
  11  * without specific, written prior authorization.  If the
  12  * above copyright notice or any other identification of the
  13  * University of Michigan is included in any copy of any
  14  * portion of this software, then the disclaimer below must
  15  * also be included.
  16  *
  17  * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
  18  * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
  19  * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY O
  20  * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
  21  * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
  22  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
  23  * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
  24  * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
  25  * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
  26  * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
  27  * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGES.
  29  */
  30
  31  /*
  32  * Portions Copyright (c) 2008
  33  * The Linux Box Corporation
  34  * ALL RIGHTS RESERVED
  35  *
  36  * Permission is granted to use, copy, create derivative works
  37  * and redistribute this software and such derivative works
  38  * for any purpose, so long as the name of the Linux Box
  39  * Corporation is not used in any advertising or publicity
  40  * pertaining to the use or distribution of this software
  41  * without specific, written prior authorization.  If the
  42  * above copyright notice or any other identification of the
  43  * Linux Box Corporation is included in any copy of any
  44  * portion of this software, then the disclaimer below must
  45  * also be included.
  46  *
  47  * This software is provided as is, without representation
  48  * from the Linux Box Corporation as to its fitness for any
  49  * purpose, and without warranty by the Linux Box Corporation
  50  * of any kind, either express or implied, including
  51  * without limitation the implied warranties of
  52  * merchantability and fitness for a particular purpose.  The
  53  * Linux Box Corporation shall not be liable for any damages,
  54  * including special, indirect, incidental, or consequential
  55  * damages, with respect to any claim arising out of or in
  56  * connection with the use of the software, even if it has been
  57  * or is hereafter advised of the possibility of such damages.
  58  */
  59
  60
  61 #include <afsconfig.h>
  62 #include "afs/param.h"
  63 #if defined(AFS_CACHE_BYPASS) || defined(UKERNEL)
  64 #include "afs/afs_bypasscache.h"
  65
  66 /*
  67  * afs_bypasscache.c
  68  *
  69  */
  70 #include "afs/sysincludes.h" /* Standard vendor system headers */
  71 #include "afs/afsincludes.h" /* Afs-based standard headers */
  72 #include "afs/afs_stats.h"   /* statistics */
  73 #include "afs/nfsclient.h"
  74 #include "rx/rx_globals.h"
  75
  76 #ifndef afs_min
  77 #define afs_min(A,B) ((A)<(B)) ? (A) : (B)
  78 #endif
  79
  80 /* conditional GLOCK macros */
  81 #define COND_GLOCK(var) \
  82         do { \
  83                 var = ISAFS_GLOCK(); \
  84                 if(!var) \
  85                         RX_AFS_GLOCK(); \
  86         } while(0)
  87
  88 #define COND_RE_GUNLOCK(var) \
  89         do { \
  90                 if(var) \
  91                         RX_AFS_GUNLOCK(); \
  92         } while(0)
  93
  94
  95 /* conditional GUNLOCK macros */
  96
  97 #define COND_GUNLOCK(var) \
  98         do {    \
  99                 var = ISAFS_GLOCK(); \
 100                 if(var) \
 101                         RX_AFS_GUNLOCK(); \
 102         } while(0)
 103
 104 #define COND_RE_GLOCK(var) \
 105         do { \
 106                 if(var) \
 107                         RX_AFS_GLOCK(); \
 108         } while(0)
 109
 110
 111 int cache_bypass_strategy   =   NEVER_BYPASS_CACHE;
 112 afs_size_t cache_bypass_threshold  =    AFS_CACHE_BYPASS_DISABLED; /* file size > threshold triggers bypass */
 113 int cache_bypass_prefetch = 1;  /* Should we do prefetching ? */
 114
 115 extern afs_rwlock_t afs_xcbhash;
 116
 117 /*
 118  * This is almost exactly like the PFlush() routine in afs_pioctl.c,
 119  * but that routine is static.  We are about to change a file from
 120  * normal caching to bypass it's caching.  Therefore, we want to
 121  * free up any cache space in use by the file, and throw out any
 122  * existing VM pages for the file.  We keep track of the number of
 123  * times we go back and forth from caching to bypass.
 124  */
 125 void
 126 afs_TransitionToBypass(struct vcache *avc,
 127                        afs_ucred_t *acred, int aflags)
 128 {
 129
 130     afs_int32 code;
 131     int setDesire = 0;
 132     int setManual = 0;
 133
 134     if (!avc)
 135         return;
 136
 137     if (aflags & TRANSChangeDesiredBit)
 138         setDesire = 1;
 139     if (aflags & TRANSSetManualBit)
 140         setManual = 1;
 141
 142     AFS_GLOCK();
 143
 144     ObtainWriteLock(&avc->lock, 925);
 145     /*
 146      * Someone may have beat us to doing the transition - we had no lock
 147      * when we checked the flag earlier.  No cause to panic, just return.
 148      */
 149     if (avc->cachingStates & FCSBypass)
 150         goto done;
 151
 152     /* If we never cached this, just change state */
 153     if (setDesire && (!(avc->cachingStates & FCSBypass))) {
 154         avc->cachingStates |= FCSBypass;
 155         goto done;
 156     }
 157
 158     /* cg2v, try to store any chunks not written 20071204 */
 159     if (avc->execsOrWriters > 0) {
 160         struct vrequest *treq = NULL;
 161
 162         code = afs_CreateReq(&treq, acred);
 163         if (!code) {
 164             code = afs_StoreAllSegments(avc, treq, AFS_SYNC | AFS_LASTSTORE);
 165             afs_DestroyReq(treq);
 166         }
 167     }
 168
 169     /* also cg2v, don't dequeue the callback */
 170     /* next reference will re-stat */
 171     afs_StaleVCacheFlags(avc, AFS_STALEVC_NOCB, CDirty);
 172     /* now find the disk cache entries */
 173     afs_TryToSmush(avc, acred, 1);
 174     if (avc->linkData && !(avc->f.states & CCore)) {
 175         afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1);
 176         avc->linkData = NULL;
 177     }
 178
 179     avc->cachingStates |= FCSBypass;    /* Set the bypass flag */
 180     if(setDesire)
 181         avc->cachingStates |= FCSDesireBypass;
 182     if(setManual)
 183         avc->cachingStates |= FCSManuallySet;
 184     avc->cachingTransitions++;
 185
 186 done:
 187     ReleaseWriteLock(&avc->lock);
 188     AFS_GUNLOCK();
 189 }
 190
 191 /*
 192  * This is almost exactly like the PFlush() routine in afs_pioctl.c,
 193  * but that routine is static.  We are about to change a file from
 194  * bypassing caching to normal caching.  Therefore, we want to
 195  * throw out any existing VM pages for the file.  We keep track of
 196  * the number of times we go back and forth from caching to bypass.
 197  */
 198 void
 199 afs_TransitionToCaching(struct vcache *avc,
 200                         afs_ucred_t *acred,
 201                         int aflags)
 202 {
 203     int resetDesire = 0;
 204     int setManual = 0;
 205
 206     if (!avc)
 207         return;
 208
 209     if (aflags & TRANSChangeDesiredBit)
 210         resetDesire = 1;
 211     if (aflags & TRANSSetManualBit)
 212         setManual = 1;
 213
 214     AFS_GLOCK();
 215     ObtainWriteLock(&avc->lock, 926);
 216     /*
 217      * Someone may have beat us to doing the transition - we had no lock
 218      * when we checked the flag earlier.  No cause to panic, just return.
 219      */
 220     if (!(avc->cachingStates & FCSBypass))
 221         goto done;
 222
 223     /* Ok, we actually do need to flush */
 224     /* next reference will re-stat cache entry */
 225     afs_StaleVCacheFlags(avc, 0, CDirty);
 226
 227     /* now find the disk cache entries */
 228     afs_TryToSmush(avc, acred, 1);
 229     if (avc->linkData && !(avc->f.states & CCore)) {
 230         afs_osi_Free(avc->linkData, strlen(avc->linkData) + 1);
 231         avc->linkData = NULL;
 232     }
 233
 234     avc->cachingStates &= ~(FCSBypass);    /* Reset the bypass flag */
 235     if (resetDesire)
 236         avc->cachingStates &= ~(FCSDesireBypass);
 237     if (setManual)
 238         avc->cachingStates |= FCSManuallySet;
 239     avc->cachingTransitions++;
 240
 241 done:
 242     ReleaseWriteLock(&avc->lock);
 243     AFS_GUNLOCK();
 244 }
 245
 246 /* In the case where there's an error in afs_NoCacheFetchProc or
 247  * afs_PrefetchNoCache, all of the pages they've been passed need
 248  * to be unlocked.
 249  */
 250 #ifdef UKERNEL
 251 typedef void * bypass_page_t;
 252
 253 #define unlock_and_release_pages(auio)
 254 #define release_full_page(pp, pageoff)
 255
 256 #else
 257 typedef struct page * bypass_page_t;
 258
 259 #define unlock_and_release_pages(auio) \
 260     do { \
 261         struct iovec *ciov;     \
 262         bypass_page_t pp; \
 263         afs_int32 iovmax; \
 264         afs_int32 iovno = 0; \
 265         ciov = auio->uio_iov; \
 266         iovmax = auio->uio_iovcnt - 1;  \
 267         pp = (bypass_page_t) ciov->iov_base;    \
 268         while(1) { \
 269             if (pp) { \
 270                 if (PageLocked(pp)) \
 271                     unlock_page(pp);    \
 272                 put_page(pp); /* decrement refcount */ \
 273             } \
 274             iovno++; \
 275             if(iovno > iovmax) \
 276                 break; \
 277             ciov = (auio->uio_iov + iovno);     \
 278             pp = (bypass_page_t) ciov->iov_base;        \
 279         } \
 280     } while(0)
 281
 282 #define release_full_page(pp, pageoff)                  \
 283     do { \
 284         /* this is appropriate when no caller intends to unlock \
 285          * and release the page */ \
 286         SetPageUptodate(pp); \
 287         if(PageLocked(pp)) \
 288             unlock_page(pp); \
 289         else \
 290             afs_warn("afs_NoCacheFetchProc: page not locked!\n"); \
 291         put_page(pp); /* decrement refcount */ \
 292     } while(0)
 293 #endif
 294
 295 static void
 296 afs_bypass_copy_page(bypass_page_t pp, int pageoff, struct iovec *rxiov,
 297         int iovno, int iovoff, struct uio *auio, int curiov, int partial)
 298 {
 299     char *address;
 300     int dolen;
 301
 302     if (partial)
 303         dolen = auio->uio_iov[curiov].iov_len - pageoff;
 304     else
 305         dolen = rxiov[iovno].iov_len - iovoff;
 306
 307 #if !defined(UKERNEL)
 308 # if defined(KMAP_ATOMIC_TAKES_NO_KM_TYPE)
 309     address = kmap_atomic(pp);
 310 # else
 311     address = kmap_atomic(pp, KM_USER0);
 312 # endif
 313 #else
 314     address = pp;
 315 #endif
 316     memcpy(address + pageoff, (char *)(rxiov[iovno].iov_base) + iovoff, dolen);
 317 #if !defined(UKERNEL)
 318 # if defined(KMAP_ATOMIC_TAKES_NO_KM_TYPE)
 319     kunmap_atomic(address);
 320 # else
 321     kunmap_atomic(address, KM_USER0);
 322 # endif
 323 #endif
 324 }
 325
 326 /* no-cache prefetch routine */
 327 static afs_int32
 328 afs_NoCacheFetchProc(struct rx_call *acall,
 329                      struct vcache *avc,
 330                      struct uio *auio,
 331                      afs_int32 release_pages,
 332                      afs_int32 size)
 333 {
 334     afs_int32 length;
 335     afs_int32 code;
 336     int moredata, iovno, iovoff, iovmax, result, locked;
 337     struct iovec *ciov;
 338     struct iovec *rxiov;
 339     int nio = 0;
 340     bypass_page_t pp;
 341
 342     int curpage, bytes;
 343     int pageoff;
 344
 345     rxiov = osi_AllocSmallSpace(sizeof(struct iovec) * RX_MAXIOVECS);
 346     ciov = auio->uio_iov;
 347     pp = (bypass_page_t) ciov->iov_base;
 348     iovmax = auio->uio_iovcnt - 1;
 349     iovno = iovoff = result = 0;
 350
 351     do {
 352         COND_GUNLOCK(locked);
 353         code = rx_Read(acall, (char *)&length, sizeof(afs_int32));
 354         COND_RE_GLOCK(locked);
 355         if (code != sizeof(afs_int32)) {
 356             result = EIO;
 357             afs_warn("Preread error. code: %d instead of %d\n",
 358                 code, (int)sizeof(afs_int32));
 359             unlock_and_release_pages(auio);
 360             goto done;
 361         } else
 362             length = ntohl(length);
 363
 364         if (length > size) {
 365             result = EIO;
 366             afs_warn("Preread error. Got length %d, which is greater than size %d\n",
 367                      length, size);
 368             unlock_and_release_pages(auio);
 369             goto done;
 370         }
 371
 372         /* If we get a 0 length reply, time to cleanup and return */
 373         if (length == 0) {
 374             unlock_and_release_pages(auio);
 375             result = 0;
 376             goto done;
 377         }
 378
 379         /*
 380          * The fetch protocol is extended for the AFS/DFS translator
 381          * to allow multiple blocks of data, each with its own length,
 382          * to be returned. As long as the top bit is set, there are more
 383          * blocks expected.
 384          *
 385          * We do not do this for AFS file servers because they sometimes
 386          * return large negative numbers as the transfer size.
 387          */
 388         if (avc->f.states & CForeign) {
 389             moredata = length & 0x80000000;
 390             length &= ~0x80000000;
 391         } else {
 392             moredata = 0;
 393         }
 394
 395         for (curpage = 0; curpage <= iovmax; curpage++) {
 396             pageoff = 0;
 397             /* properly, this should track uio_resid, not a fixed page size! */
 398             while (pageoff < auio->uio_iov[curpage].iov_len) {
 399                 /* If no more iovs, issue new read. */
 400                 if (iovno >= nio) {
 401                     COND_GUNLOCK(locked);
 402                     bytes = rx_Readv(acall, rxiov, &nio, RX_MAXIOVECS, length);
 403                     COND_RE_GLOCK(locked);
 404                     if (bytes < 0) {
 405                         afs_warn("afs_NoCacheFetchProc: rx_Read error. Return code was %d\n", bytes);
 406                         result = bytes;
 407                         unlock_and_release_pages(auio);
 408                         goto done;
 409                     } else if (bytes == 0) {
 410                         /* we failed to read the full length */
 411                         result = EIO;
 412                         afs_warn("afs_NoCacheFetchProc: rx_Read returned zero. Aborting.\n");
 413                         unlock_and_release_pages(auio);
 414                         goto done;
 415                     }
 416                     size -= bytes;
 417                     auio->uio_resid -= bytes;
 418                     iovno = 0;
 419                 }
 420                 pp = (bypass_page_t)auio->uio_iov[curpage].iov_base;
 421                 if (pageoff + (rxiov[iovno].iov_len - iovoff) <= auio->uio_iov[curpage].iov_len) {
 422                     /* Copy entire (or rest of) current iovec into current page */
 423                     if (pp)
 424                         afs_bypass_copy_page(pp, pageoff, rxiov, iovno, iovoff, auio, curpage, 0);
 425                     length -= (rxiov[iovno].iov_len - iovoff);
 426                     pageoff += rxiov[iovno].iov_len - iovoff;
 427                     iovno++;
 428                     iovoff = 0;
 429                 } else {
 430                     /* Copy only what's needed to fill current page */
 431                     if (pp)
 432                         afs_bypass_copy_page(pp, pageoff, rxiov, iovno, iovoff, auio, curpage, 1);
 433                     length -= (auio->uio_iov[curpage].iov_len - pageoff);
 434                     iovoff += auio->uio_iov[curpage].iov_len - pageoff;
 435                     pageoff = auio->uio_iov[curpage].iov_len;
 436                 }
 437
 438                 /* we filled a page, or this is the last page.  conditionally release it */
 439                 if (pp && ((pageoff == auio->uio_iov[curpage].iov_len &&
 440                             release_pages) || (length == 0 && iovno >= nio)))
 441                     release_full_page(pp, pageoff);
 442
 443                 if (length == 0 && iovno >= nio)
 444                     goto done;
 445             }
 446         }
 447     } while (moredata);
 448
 449 done:
 450     osi_FreeSmallSpace(rxiov);
 451     return result;
 452 }
 453
 454
 455 /* dispatch a no-cache read request */
 456 afs_int32
 457 afs_ReadNoCache(struct vcache *avc,
 458                 struct nocache_read_request *bparms,
 459                 afs_ucred_t *acred)
 460 {
 461     afs_int32 code;
 462     afs_int32 bcnt;
 463     struct brequest *breq;
 464     struct vrequest *areq = NULL;
 465
 466     if (avc->vc_error) {
 467         code = EIO;
 468         afs_warn("afs_ReadNoCache VCache Error!\n");
 469         goto cleanup;
 470     }
 471
 472     AFS_GLOCK();
 473     /* the receiver will free areq */
 474     code = afs_CreateReq(&areq, acred);
 475     if (code) {
 476         afs_warn("afs_ReadNoCache afs_CreateReq error!\n");
 477     } else {
 478         code = afs_VerifyVCache(avc, areq);
 479         if (code) {
 480             afs_warn("afs_ReadNoCache Failed to verify VCache!\n");
 481         }
 482     }
 483     AFS_GUNLOCK();
 484
 485     if (code) {
 486         code = afs_CheckCode(code, areq, 11);   /* failed to get it */
 487         goto cleanup;
 488     }
 489
 490     bparms->areq = areq;
 491
 492     /* and queue this one */
 493     bcnt = 1;
 494     AFS_GLOCK();
 495     while(bcnt < 20) {
 496         breq = afs_BQueue(BOP_FETCH_NOCACHE, avc, B_DONTWAIT, 0, acred, 1, 1,
 497                           bparms, (void *)0, (void *)0);
 498         if(breq != 0) {
 499             code = 0;
 500             break;
 501         }
 502         afs_osi_Wait(10 * bcnt, 0, 0);
 503     }
 504     AFS_GUNLOCK();
 505
 506     if(!breq) {
 507         code = EBUSY;
 508         goto cleanup;
 509     }
 510
 511     return code;
 512
 513 cleanup:
 514     /* If there's a problem before we queue the request, we need to
 515      * do everything that would normally happen when the request was
 516      * processed, like unlocking the pages and freeing memory.
 517      */
 518     unlock_and_release_pages(bparms->auio);
 519     AFS_GLOCK();
 520     afs_DestroyReq(areq);
 521     AFS_GUNLOCK();
 522     osi_Free(bparms->auio->uio_iov,
 523              bparms->auio->uio_iovcnt * sizeof(struct iovec));
 524     osi_Free(bparms->auio, sizeof(struct uio));
 525     osi_Free(bparms, sizeof(struct nocache_read_request));
 526     return code;
 527 }
 528
 529
 530 /* Cannot have static linkage--called from BPrefetch (afs_daemons) */
 531 afs_int32
 532 afs_PrefetchNoCache(struct vcache *avc,
 533                     afs_ucred_t *acred,
 534                     struct nocache_read_request *bparms)
 535 {
 536     struct uio *auio;
 537 #ifndef UKERNEL
 538     struct iovec *iovecp;
 539 #endif
 540     struct vrequest *areq;
 541     afs_int32 code = 0;
 542     struct rx_connection *rxconn;
 543 #ifdef AFS_64BIT_CLIENT
 544     afs_int32 length_hi, bytes, locked;
 545 #endif
 546
 547     struct afs_conn *tc;
 548     struct rx_call *tcall;
 549     struct tlocal1 {
 550         struct AFSVolSync tsync;
 551         struct AFSFetchStatus OutStatus;
 552         struct AFSCallBack CallBack;
 553     };
 554     struct tlocal1 *tcallspec;
 555
 556     auio = bparms->auio;
 557     areq = bparms->areq;
 558 #ifndef UKERNEL
 559     iovecp = auio->uio_iov;
 560 #endif
 561
 562     tcallspec = osi_Alloc(sizeof(struct tlocal1));
 563     do {
 564         tc = afs_Conn(&avc->f.fid, areq, SHARED_LOCK /* ignored */, &rxconn);
 565         if (tc) {
 566             avc->callback = tc->parent->srvr->server;
 567             tcall = rx_NewCall(rxconn);
 568 #ifdef AFS_64BIT_CLIENT
 569             if (!afs_serverHasNo64Bit(tc)) {
 570                 code = StartRXAFS_FetchData64(tcall,
 571                                               (struct AFSFid *) &avc->f.fid.Fid,
 572                                               auio->uio_offset,
 573                                               bparms->length);
 574                 if (code == 0) {
 575                     COND_GUNLOCK(locked);
 576                     bytes = rx_Read(tcall, (char *)&length_hi,
 577                                     sizeof(afs_int32));
 578                     COND_RE_GLOCK(locked);
 579
 580                     if (bytes != sizeof(afs_int32)) {
 581                         length_hi = 0;
 582                         COND_GUNLOCK(locked);
 583                         code = rx_EndCall(tcall, RX_PROTOCOL_ERROR);
 584                         COND_RE_GLOCK(locked);
 585                         tcall = NULL;
 586                     }
 587                 }
 588             } /* afs_serverHasNo64Bit */
 589             if (code == RXGEN_OPCODE || afs_serverHasNo64Bit(tc)) {
 590                 if (auio->uio_offset > 0x7FFFFFFF) {
 591                     code = EFBIG;
 592                 } else {
 593                     afs_int32 pos;
 594                     pos = auio->uio_offset;
 595                     COND_GUNLOCK(locked);
 596                     if (!tcall)
 597                         tcall = rx_NewCall(rxconn);
 598                     code = StartRXAFS_FetchData(tcall,
 599                                         (struct AFSFid *) &avc->f.fid.Fid,
 600                                         pos, bparms->length);
 601                     COND_RE_GLOCK(locked);
 602                 }
 603                 afs_serverSetNo64Bit(tc);
 604             }
 605 #else
 606             code = StartRXAFS_FetchData(tcall,
 607                                         (struct AFSFid *) &avc->f.fid.Fid,
 608                                         auio->uio_offset, bparms->length);
 609 #endif
 610             if (code == 0) {
 611                 code = afs_NoCacheFetchProc(tcall, avc, auio,
 612                                             1 /* release_pages */,
 613                                             bparms->length);
 614             } else {
 615                 afs_warn("BYPASS: StartRXAFS_FetchData failed: %d\n", code);
 616                 unlock_and_release_pages(auio);
 617                 (void)afs_Analyze(tc, rxconn, code, &avc->f.fid, areq,
 618                                   AFS_STATS_FS_RPCIDX_FETCHDATA,
 619                                   SHARED_LOCK, NULL);
 620                 goto done;
 621             }
 622             if (code == 0) {
 623                 code = EndRXAFS_FetchData(tcall, &tcallspec->OutStatus,
 624                                           &tcallspec->CallBack,
 625                                           &tcallspec->tsync);
 626             } else {
 627                 afs_warn("BYPASS: NoCacheFetchProc failed: %d\n", code);
 628             }
 629             code = rx_EndCall(tcall, code);
 630         } else {
 631             afs_warn("BYPASS: No connection.\n");
 632             code = -1;
 633             unlock_and_release_pages(auio);
 634             (void)afs_Analyze(tc, rxconn, code, &avc->f.fid, areq,
 635                               AFS_STATS_FS_RPCIDX_FETCHDATA,
 636                               SHARED_LOCK, NULL);
 637             goto done;
 638         }
 639     } while (afs_Analyze(tc, rxconn, code, &avc->f.fid, areq,
 640                                                  AFS_STATS_FS_RPCIDX_FETCHDATA,
 641                                                  SHARED_LOCK,0));
 642 done:
 643     /*
 644      * Copy appropriate fields into vcache
 645      */
 646
 647     if (!code)
 648         afs_ProcessFS(avc, &tcallspec->OutStatus, areq);
 649
 650     afs_DestroyReq(areq);
 651     osi_Free(tcallspec, sizeof(struct tlocal1));
 652     osi_Free(bparms, sizeof(struct nocache_read_request));
 653 #ifndef UKERNEL
 654     /* in UKERNEL, the "pages" are passed in */
 655     osi_Free(iovecp, auio->uio_iovcnt * sizeof(struct iovec));
 656     osi_Free(auio, sizeof(struct uio));
 657 #endif
 658     return code;
 659 }
 660 #endif