src/afs/VNOPS/afs_vnop_write.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Implements:
  12  * afs_write
  13  * afs_UFSWriteUIO
  14  * afs_StoreOnLastReference
  15  * afs_close
  16  * afs_fsync
  17  */
  18
  19 #include <afsconfig.h>
  20 #include "afs/param.h"
  21
  22
  23 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  24 #include "afsincludes.h"        /* Afs-based standard headers */
  25 #include "afs/afs_stats.h"      /* statistics */
  26 #include "afs/afs_cbqueue.h"
  27 #include "afs/nfsclient.h"
  28 #include "afs/afs_osidnlc.h"
  29
  30
  31 extern unsigned char *afs_indexFlags;
  32
  33 /* Called by all write-on-close routines: regular afs_close,
  34  * store via background daemon and store via the
  35  * afs_FlushActiveVCaches routine (when CCORE is on).
  36  * avc->lock must be write-locked.
  37  */
  38 int
  39 afs_StoreOnLastReference(struct vcache *avc,
  40                          struct vrequest *treq)
  41 {
  42     int code = 0;
  43
  44     AFS_STATCNT(afs_StoreOnLastReference);
  45     /* if CCore flag is set, we clear it and do the extra decrement
  46      * ourselves now. If we're called by the CCore clearer, the CCore
  47      * flag will already be clear, so we don't have to worry about
  48      * clearing it twice. */
  49     if (avc->f.states & CCore) {
  50         afs_ucred_t *cred;
  51
  52         avc->f.states &= ~CCore;
  53 #if defined(AFS_SGI_ENV)
  54         osi_Assert(avc->opens > 0 && avc->execsOrWriters > 0);
  55 #endif
  56         /* WARNING: Our linux cm code treats the execsOrWriters counter differently
  57          * depending on the flags the file was opened with. So, if you make any
  58          * changes to the way the execsOrWriters flag is handled check with the
  59          * top level code.  */
  60         avc->opens--;
  61         avc->execsOrWriters--;
  62         AFS_RELE(AFSTOV(avc));  /* VN_HOLD at set CCore(afs_FakeClose) */
  63         cred = (afs_ucred_t *)avc->linkData;    /* "crheld" in afs_FakeClose */
  64         crfree(cred);
  65         avc->linkData = NULL;
  66     }
  67
  68     if (!AFS_IS_DISCONNECTED) {
  69         /* Connected. */
  70
  71         /* Now, send the file back.  Used to require 0 writers left, but now do
  72          * it on every close for write, since two closes in a row are harmless
  73          * since first will clean all chunks, and second will be noop.  Note that
  74          * this will also save confusion when someone keeps a file open
  75          * inadvertently, since with old system, writes to the server would never
  76          * happen again.
  77          */
  78         code = afs_StoreAllSegments(avc, treq, AFS_LASTSTORE /*!sync-to-disk */ );
  79         /*
  80          * We have to do these after the above store in done: in some systems
  81          * like aix they'll need to flush all the vm dirty pages to the disk via
  82          * the strategy routine. During that all procedure (done under no avc
  83          * locks) opens, refcounts would be zero, since it didn't reach the
  84          * afs_{rd,wr} routines which means the vcache is a perfect candidate
  85          * for flushing!
  86          */
  87      } else if (AFS_IS_DISCON_RW) {
  88         afs_DisconAddDirty(avc, VDisconWriteClose, 0);
  89      }          /* if not disconnected */
  90
  91 #if defined(AFS_SGI_ENV)
  92     osi_Assert(avc->opens > 0 && avc->execsOrWriters > 0);
  93 #endif
  94
  95     avc->opens--;
  96     avc->execsOrWriters--;
  97     return code;
  98 }
  99
 100 int
 101 afs_UFSWriteUIO(struct vcache *avc, afs_dcache_id_t *inode, struct uio *tuiop)
 102 {
 103     struct osi_file *tfile;
 104     int code;
 105
 106     tfile = (struct osi_file *)osi_UFSOpen(inode);
 107     if (!tfile)
 108         return -1;
 109
 110 #if defined(AFS_AIX41_ENV)
 111     AFS_GUNLOCK();
 112     code = VNOP_RDWR(tfile->vnode, UIO_WRITE, FWRITE, tuiop, NULL, NULL,
 113                      NULL, afs_osi_credp);
 114     AFS_GLOCK();
 115 #elif defined(AFS_AIX32_ENV)
 116     code = VNOP_RDWR(tfile->vnode, UIO_WRITE, FWRITE, tuiop, NULL, NULL);
 117 #elif defined(AFS_AIX_ENV)
 118     code = VNOP_RDWR(tfile->vnode, UIO_WRITE, FWRITE, (off_t) &offset,
 119                      tuiop, NULL, NULL, -1);
 120 #elif defined(AFS_SUN5_ENV)
 121     AFS_GUNLOCK();
 122 # ifdef AFS_SUN510_ENV
 123     VOP_RWLOCK(tfile->vnode, 1, NULL);
 124     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp, NULL);
 125     VOP_RWUNLOCK(tfile->vnode, 1, NULL);
 126 # else
 127     VOP_RWLOCK(tfile->vnode, 1);
 128     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp);
 129     VOP_RWUNLOCK(tfile->vnode, 1);
 130 # endif
 131     AFS_GLOCK();
 132     if (code == ENOSPC)
 133         afs_WarnENOSPC();
 134 #elif defined(AFS_SGI_ENV)
 135     AFS_GUNLOCK();
 136     avc->f.states |= CWritingUFS;
 137     AFS_VOP_RWLOCK(tfile->vnode, VRWLOCK_WRITE);
 138     AFS_VOP_WRITE(tfile->vnode, tuiop, IO_ISLOCKED, afs_osi_credp, code);
 139     AFS_VOP_RWUNLOCK(tfile->vnode, VRWLOCK_WRITE);
 140     avc->f.states &= ~CWritingUFS;
 141     AFS_GLOCK();
 142 #elif defined(AFS_HPUX100_ENV)
 143     {
 144         AFS_GUNLOCK();
 145         code = VOP_RDWR(tfile->vnode, tuiop, UIO_WRITE, 0, afs_osi_credp);
 146         AFS_GLOCK();
 147     }
 148 #elif defined(AFS_LINUX20_ENV)
 149     AFS_GUNLOCK();
 150     code = osi_rdwr(tfile, tuiop, UIO_WRITE);
 151     AFS_GLOCK();
 152 #elif defined(AFS_DARWIN80_ENV)
 153     AFS_GUNLOCK();
 154     code = VNOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_ctxtp);
 155     AFS_GLOCK();
 156 #elif defined(AFS_DARWIN_ENV)
 157     AFS_GUNLOCK();
 158     VOP_LOCK(tfile->vnode, LK_EXCLUSIVE, current_proc());
 159     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp);
 160     VOP_UNLOCK(tfile->vnode, 0, current_proc());
 161     AFS_GLOCK();
 162 #elif defined(AFS_FBSD80_ENV)
 163     AFS_GUNLOCK();
 164     VOP_LOCK(tfile->vnode, LK_EXCLUSIVE);
 165     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp);
 166     VOP_UNLOCK(tfile->vnode, 0);
 167     AFS_GLOCK();
 168 #elif defined(AFS_FBSD_ENV)
 169     AFS_GUNLOCK();
 170     VOP_LOCK(tfile->vnode, LK_EXCLUSIVE, curthread);
 171     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp);
 172     VOP_UNLOCK(tfile->vnode, 0, curthread);
 173     AFS_GLOCK();
 174 #elif defined(AFS_NBSD_ENV)
 175     AFS_GUNLOCK();
 176     VOP_LOCK(tfile->vnode, LK_EXCLUSIVE);
 177     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp);
 178 #if defined(AFS_NBSD60_ENV)
 179     VOP_UNLOCK(tfile->vnode);
 180 #else
 181     VOP_UNLOCK(tfile->vnode, 0);
 182 #endif
 183     AFS_GLOCK();
 184 #elif defined(AFS_XBSD_ENV)
 185     AFS_GUNLOCK();
 186     VOP_LOCK(tfile->vnode, LK_EXCLUSIVE, curproc);
 187     code = VOP_WRITE(tfile->vnode, tuiop, 0, afs_osi_credp);
 188     VOP_UNLOCK(tfile->vnode, 0, curproc);
 189     AFS_GLOCK();
 190 #else
 191 # ifdef AFS_HPUX_ENV
 192     tuio.uio_fpflags &= ~FSYNCIO;       /* don't do sync io */
 193 # endif
 194     code = VOP_RDWR(tfile->vnode, tuiop, UIO_WRITE, 0, afs_osi_credp);
 195 #endif
 196     osi_UFSClose(tfile);
 197
 198     return code;
 199 }
 200
 201 /* called on writes */
 202 int
 203 afs_write(struct vcache *avc, struct uio *auio, int aio,
 204              afs_ucred_t *acred, int noLock)
 205 {
 206     afs_size_t totalLength;
 207     afs_size_t transferLength;
 208     afs_size_t filePos;
 209     afs_size_t offset, len;
 210     afs_int32 tlen;
 211     afs_int32 trimlen;
 212     afs_int32 startDate;
 213     afs_int32 max;
 214     struct dcache *tdc;
 215 #ifdef _HIGHC_
 216     volatile
 217 #endif
 218     afs_int32 error;
 219 #if defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV)
 220     struct vnode *vp = AFSTOV(avc);
 221 #endif
 222     struct uio *tuiop = NULL;
 223     afs_int32 code;
 224     struct vrequest *treq = NULL;
 225
 226     AFS_STATCNT(afs_write);
 227
 228     if (avc->vc_error)
 229         return avc->vc_error;
 230
 231     if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW)
 232         return ENETDOWN;
 233
 234     startDate = osi_Time();
 235     if ((code = afs_CreateReq(&treq, acred)))
 236         return code;
 237     /* otherwise we read */
 238     totalLength = AFS_UIO_RESID(auio);
 239     filePos = AFS_UIO_OFFSET(auio);
 240     error = 0;
 241     transferLength = 0;
 242     afs_Trace4(afs_iclSetp, CM_TRACE_WRITE, ICL_TYPE_POINTER, avc,
 243                ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(filePos), ICL_TYPE_OFFSET,
 244                ICL_HANDLE_OFFSET(totalLength), ICL_TYPE_OFFSET,
 245                ICL_HANDLE_OFFSET(avc->f.m.Length));
 246     if (!noLock) {
 247         afs_MaybeWakeupTruncateDaemon();
 248         ObtainWriteLock(&avc->lock, 556);
 249     }
 250 #if defined(AFS_SGI_ENV)
 251     {
 252         off_t diff;
 253         /*
 254          * afs_xwrite handles setting m.Length
 255          * and handles APPEND mode.
 256          * Since we are called via strategy, we need to trim the write to
 257          * the actual size of the file
 258          */
 259         osi_Assert(filePos <= avc->f.m.Length);
 260         diff = avc->f.m.Length - filePos;
 261         AFS_UIO_SETRESID(auio, MIN(totalLength, diff));
 262         totalLength = AFS_UIO_RESID(auio);
 263     }
 264 #else
 265     if (aio & IO_APPEND) {
 266         /* append mode, start it at the right spot */
 267 #if     defined(AFS_SUN5_ENV)
 268         auio->uio_loffset = 0;
 269 #endif
 270         filePos = avc->f.m.Length;
 271         AFS_UIO_SETOFFSET(auio, avc->f.m.Length);
 272     }
 273 #endif
 274     /*
 275      * Note that we use startDate rather than calling osi_Time() here.
 276      * This is to avoid counting lock-waiting time in file date (for ranlib).
 277      */
 278     avc->f.m.Date = startDate;
 279
 280 #if     defined(AFS_HPUX_ENV)
 281 #if     defined(AFS_HPUX101_ENV)
 282     if ((totalLength + filePos) >> 9 >
 283         p_rlimit(u.u_procp)[RLIMIT_FSIZE].rlim_cur) {
 284 #else
 285     if ((totalLength + filePos) >> 9 > u.u_rlimit[RLIMIT_FSIZE].rlim_cur) {
 286 #endif
 287         if (!noLock)
 288             ReleaseWriteLock(&avc->lock);
 289         afs_DestroyReq(treq);
 290         return (EFBIG);
 291     }
 292 #endif
 293 #if defined(AFS_VM_RDWR_ENV) && !defined(AFS_FAKEOPEN_ENV)
 294     /*
 295      * If write is implemented via VM, afs_FakeOpen() is called from the
 296      * high-level write op.
 297      */
 298     if (avc->execsOrWriters <= 0) {
 299         afs_warn("WARNING: afs_ufswr vcp=%lx, exOrW=%d\n", (unsigned long)avc,
 300                avc->execsOrWriters);
 301     }
 302 #else
 303     afs_FakeOpen(avc);
 304 #endif
 305     avc->f.states |= CDirty;
 306
 307     while (totalLength > 0) {
 308         tdc = afs_ObtainDCacheForWriting(avc, filePos, totalLength, treq,
 309                                          noLock);
 310         if (!tdc) {
 311             error = EIO;
 312             break;
 313         }
 314         len = totalLength;      /* write this amount by default */
 315         offset = filePos - AFS_CHUNKTOBASE(tdc->f.chunk);
 316         max = AFS_CHUNKTOSIZE(tdc->f.chunk);    /* max size of this chunk */
 317         if (max <= len + offset) {      /*if we'd go past the end of this chunk */
 318             /* it won't all fit in this chunk, so write as much
 319              * as will fit */
 320             len = max - offset;
 321         }
 322
 323         if (tuiop)
 324             afsio_free(tuiop);
 325         trimlen = len;
 326         tuiop = afsio_partialcopy(auio, trimlen);
 327         AFS_UIO_SETOFFSET(tuiop, offset);
 328
 329         code = (*(afs_cacheType->vwriteUIO))(avc, &tdc->f.inode, tuiop);
 330
 331         if (code) {
 332             void *cfile;
 333
 334             error = code;
 335             ZapDCE(tdc);        /* bad data */
 336             cfile = afs_CFileOpen(&tdc->f.inode);
 337             osi_Assert(cfile);
 338             afs_CFileTruncate(cfile, 0);
 339             afs_CFileClose(cfile);
 340             afs_AdjustSize(tdc, 0);     /* sets f.chunkSize to 0 */
 341
 342             afs_stats_cmperf.cacheCurrDirtyChunks--;
 343             afs_indexFlags[tdc->index] &= ~IFDataMod;   /* so it does disappear */
 344             ReleaseWriteLock(&tdc->lock);
 345             afs_PutDCache(tdc);
 346             break;
 347         }
 348         /* otherwise we've written some, fixup length, etc and continue with next seg */
 349         len = len - AFS_UIO_RESID(tuiop);       /* compute amount really transferred */
 350         tlen = len;
 351         afsio_skip(auio, tlen); /* advance auio over data written */
 352         /* compute new file size */
 353         if (offset + len > tdc->f.chunkBytes) {
 354             afs_int32 tlength = offset + len;
 355             afs_AdjustSize(tdc, tlength);
 356             if (tdc->validPos < filePos + len)
 357                 tdc->validPos = filePos + len;
 358         }
 359         totalLength -= len;
 360         transferLength += len;
 361         filePos += len;
 362 #if defined(AFS_SGI_ENV)
 363         /* afs_xwrite handles setting m.Length */
 364         osi_Assert(filePos <= avc->f.m.Length);
 365 #else
 366         if (filePos > avc->f.m.Length) {
 367             if (AFS_IS_DISCON_RW)
 368                 afs_PopulateDCache(avc, filePos, treq);
 369             afs_Trace4(afs_iclSetp, CM_TRACE_SETLENGTH, ICL_TYPE_STRING,
 370                        __FILE__, ICL_TYPE_LONG, __LINE__, ICL_TYPE_OFFSET,
 371                        ICL_HANDLE_OFFSET(avc->f.m.Length), ICL_TYPE_OFFSET,
 372                        ICL_HANDLE_OFFSET(filePos));
 373             avc->f.m.Length = filePos;
 374 #if defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV)
 375             vnode_pager_setsize(vp, filePos);
 376 #endif
 377         }
 378 #endif
 379         ReleaseWriteLock(&tdc->lock);
 380         afs_PutDCache(tdc);
 381 #if !defined(AFS_VM_RDWR_ENV)
 382         /*
 383          * If write is implemented via VM, afs_DoPartialWrite() is called from
 384          * the high-level write op.
 385          */
 386         if (!noLock) {
 387             code = afs_DoPartialWrite(avc, treq);
 388             if (code) {
 389                 error = code;
 390                 break;
 391             }
 392         }
 393 #endif
 394     }
 395 #if !defined(AFS_VM_RDWR_ENV) || defined(AFS_FAKEOPEN_ENV)
 396     afs_FakeClose(avc, acred);
 397 #endif
 398     error = afs_CheckCode(error, treq, 7);
 399     /* This set is here so we get the CheckCode. */
 400     if (error && !avc->vc_error)
 401         avc->vc_error = error;
 402     if (!noLock)
 403         ReleaseWriteLock(&avc->lock);
 404     if (tuiop)
 405         afsio_free(tuiop);
 406
 407 #ifndef AFS_VM_RDWR_ENV
 408     /*
 409      * If write is implemented via VM, afs_fsync() is called from the high-level
 410      * write op.
 411      */
 412 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 413     if (noLock && (aio & IO_SYNC)) {
 414 #else
 415 #ifdef  AFS_HPUX_ENV
 416     /* On hpux on synchronous writes syncio will be set to IO_SYNC. If
 417      * we're doing them because the file was opened with O_SYNCIO specified,
 418      * we have to look in the u area. No single mechanism here!!
 419      */
 420     if (noLock && ((aio & IO_SYNC) | (auio->uio_fpflags & FSYNCIO))) {
 421 #else
 422     if (noLock && (aio & FSYNC)) {
 423 #endif
 424 #endif
 425         if (!AFS_NFSXLATORREQ(acred))
 426             afs_fsync(avc, acred);
 427     }
 428 #endif
 429     afs_DestroyReq(treq);
 430     return error;
 431 }
 432
 433 /* do partial write if we're low on unmodified chunks */
 434 int
 435 afs_DoPartialWrite(struct vcache *avc, struct vrequest *areq)
 436 {
 437     afs_int32 code;
 438
 439     if (afs_stats_cmperf.cacheCurrDirtyChunks <=
 440         afs_stats_cmperf.cacheMaxDirtyChunks
 441         || AFS_IS_DISCONNECTED)
 442         return 0;               /* nothing to do */
 443     /* otherwise, call afs_StoreDCache (later try to do this async, if possible) */
 444     afs_Trace2(afs_iclSetp, CM_TRACE_PARTIALWRITE, ICL_TYPE_POINTER, avc,
 445                ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
 446
 447 #if     defined(AFS_SUN5_ENV)
 448     code = afs_StoreAllSegments(avc, areq, AFS_ASYNC | AFS_VMSYNC_INVAL);
 449 #else
 450     code = afs_StoreAllSegments(avc, areq, AFS_ASYNC);
 451 #endif
 452     return code;
 453 }
 454
 455 /* handle any closing cleanup stuff */
 456 int
 457 #if defined(AFS_SGI65_ENV)
 458 afs_close(OSI_VC_DECL(avc), afs_int32 aflags, lastclose_t lastclose,
 459           afs_ucred_t *acred)
 460 #elif defined(AFS_SGI64_ENV)
 461 afs_close(OSI_VC_DECL(avc), afs_int32 aflags, lastclose_t lastclose,
 462           off_t offset, afs_ucred_t *acred, struct flid *flp)
 463 #elif defined(AFS_SGI_ENV)
 464 afs_close(OSI_VC_DECL(avc), afs_int32 aflags, lastclose_t lastclose
 465           off_t offset, afs_ucred_t *acred)
 466 #elif defined(AFS_SUN5_ENV)
 467 afs_close(OSI_VC_DECL(avc), afs_int32 aflags, int count, offset_t offset,
 468          afs_ucred_t *acred)
 469 #else
 470 afs_close(OSI_VC_DECL(avc), afs_int32 aflags, afs_ucred_t *acred)
 471 #endif
 472 {
 473     afs_int32 code;
 474     afs_int32 code_checkcode = 0;
 475     struct brequest *tb;
 476     struct vrequest *treq = NULL;
 477 #ifdef AFS_SGI65_ENV
 478     struct flid flid;
 479 #endif
 480     struct afs_fakestat_state fakestat;
 481     OSI_VC_CONVERT(avc);
 482
 483     AFS_STATCNT(afs_close);
 484     afs_Trace2(afs_iclSetp, CM_TRACE_CLOSE, ICL_TYPE_POINTER, avc,
 485                ICL_TYPE_INT32, aflags);
 486     code = afs_CreateReq(&treq, acred);
 487     if (code)
 488         return code;
 489     afs_InitFakeStat(&fakestat);
 490     code = afs_EvalFakeStat(&avc, &fakestat, treq);
 491     if (code) {
 492         afs_PutFakeStat(&fakestat);
 493         afs_DestroyReq(treq);
 494         return code;
 495     }
 496     AFS_DISCON_LOCK();
 497 #ifdef  AFS_SUN5_ENV
 498     if (avc->flockCount) {
 499         HandleFlock(avc, LOCK_UN, treq, 0, 1 /*onlymine */ );
 500     }
 501 #endif
 502 #if defined(AFS_SGI_ENV)
 503     if (!lastclose) {
 504         afs_PutFakeStat(&fakestat);
 505         AFS_DISCON_UNLOCK();
 506         afs_DestroyReq(treq);
 507         return 0;
 508     }
 509     /* unlock any locks for pid - could be wrong for child .. */
 510     AFS_RWLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 511 # ifdef AFS_SGI65_ENV
 512     get_current_flid(&flid);
 513     cleanlocks((vnode_t *) avc, flid.fl_pid, flid.fl_sysid);
 514     HandleFlock(avc, LOCK_UN, treq, flid.fl_pid, 1 /*onlymine */ );
 515 # else
 516 #  ifdef AFS_SGI64_ENV
 517     cleanlocks((vnode_t *) avc, flp);
 518 #  else /* AFS_SGI64_ENV */
 519     cleanlocks((vnode_t *) avc, u.u_procp->p_epid, u.u_procp->p_sysid);
 520 #  endif /* AFS_SGI64_ENV */
 521     HandleFlock(avc, LOCK_UN, treq, OSI_GET_CURRENT_PID(), 1 /*onlymine */ );
 522 # endif /* AFS_SGI65_ENV */
 523     /* afs_chkpgoob will drop and re-acquire the global lock. */
 524     afs_chkpgoob(&avc->v, btoc(avc->f.m.Length));
 525 #elif defined(AFS_SUN5_ENV)
 526     if (count > 1) {
 527         /* The vfs layer may call this repeatedly with higher "count"; only
 528          * on the last close (i.e. count = 1) we should actually proceed
 529          * with the close. */
 530         afs_PutFakeStat(&fakestat);
 531         AFS_DISCON_UNLOCK();
 532         afs_DestroyReq(treq);
 533         return 0;
 534     }
 535 #else
 536     if (avc->flockCount) {      /* Release Lock */
 537         HandleFlock(avc, LOCK_UN, treq, 0, 1 /*onlymine */ );
 538     }
 539 #endif
 540     if (aflags & (FWRITE | FTRUNC)) {
 541         if (afs_BBusy() || (AFS_NFSXLATORREQ(acred)) || AFS_IS_DISCONNECTED) {
 542             /* do it yourself if daemons are all busy */
 543             ObtainWriteLock(&avc->lock, 124);
 544             code = afs_StoreOnLastReference(avc, treq);
 545             ReleaseWriteLock(&avc->lock);
 546 #if defined(AFS_SGI_ENV)
 547             AFS_RWUNLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 548 #endif
 549         } else {
 550 #if defined(AFS_SGI_ENV)
 551             AFS_RWUNLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 552 #endif
 553             /* at least one daemon is idle, so ask it to do the store.
 554              * Also, note that  we don't lock it any more... */
 555             tb = afs_BQueue(BOP_STORE, avc, 0, 1, acred,
 556                             (afs_size_t) afs_cr_uid(acred), (afs_size_t) 0,
 557                             (void *)0, (void *)0, (void *)0);
 558             /* sleep waiting for the store to start, then retrieve error code */
 559             while ((tb->flags & BUVALID) == 0) {
 560                 tb->flags |= BUWAIT;
 561                 afs_osi_Sleep(tb);
 562             }
 563             code = tb->code_raw;
 564             code_checkcode = tb->code_checkcode;
 565             afs_BRelease(tb);
 566         }
 567
 568         /* VNOVNODE is "acceptable" error code from close, since
 569          * may happen when deleting a file on another machine while
 570          * it is open here. */
 571         if (code == VNOVNODE)
 572             code = 0;
 573
 574         /* Ensure last closer gets the error. If another thread caused
 575          * DoPartialWrite and this thread does not actually store the data,
 576          * it may not see the quota error.
 577          */
 578         ObtainWriteLock(&avc->lock, 406);
 579         if (avc->vc_error) {
 580 #ifdef AFS_AIX32_ENV
 581             osi_ReleaseVM(avc, acred);
 582 #endif
 583             /* We don't know what the original raw error code was, so set
 584              * 'code' to 0. But we have the afs_CheckCode-translated error
 585              * code, so put that in code_checkcode. We cannot just set code
 586              * to avc->vc_error, since vc_error is a checkcode-translated
 587              * error code, and 'code' is supposed to be a raw error code. */
 588             code = 0;
 589             code_checkcode = avc->vc_error;
 590             avc->vc_error = 0;
 591         }
 592         ReleaseWriteLock(&avc->lock);
 593
 594         /* some codes merit specific complaint */
 595         if (code < 0) {
 596             afs_warnuser("afs: failed to store file (network problems)\n");
 597         }
 598 #ifdef  AFS_SUN5_ENV
 599         else if (code == ENOSPC || code_checkcode == ENOSPC) {
 600             afs_warnuser
 601                 ("afs: failed to store file (over quota or partition full)\n");
 602         }
 603 #else
 604         else if (code == ENOSPC || code_checkcode == ENOSPC) {
 605             afs_warnuser("afs: failed to store file (partition full)\n");
 606         } else if (code == EDQUOT || code_checkcode == EDQUOT) {
 607             afs_warnuser("afs: failed to store file (over quota)\n");
 608         }
 609 #endif
 610         else if (code || code_checkcode)
 611             afs_warnuser("afs: failed to store file (%d/%d)\n", code, code_checkcode);
 612
 613         /* finally, we flush any text pages lying around here */
 614         hzero(avc->flushDV);
 615         osi_FlushText(avc);
 616     } else {
 617 #if defined(AFS_SGI_ENV)
 618         AFS_RWUNLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 619         osi_Assert(avc->opens > 0);
 620 #endif
 621         /* file open for read */
 622         ObtainWriteLock(&avc->lock, 411);
 623         if (avc->vc_error) {
 624 #ifdef AFS_AIX32_ENV
 625             osi_ReleaseVM(avc, acred);
 626 #endif
 627             code = 0;
 628             code_checkcode = avc->vc_error;
 629             avc->vc_error = 0;
 630         }
 631 #if defined(AFS_FBSD80_ENV)
 632         /* XXX */
 633         if (!avc->opens) {
 634             afs_int32 opens, is_free, is_gone, is_doomed, iflag;
 635             struct vnode *vp = AFSTOV(avc);
 636             VI_LOCK(vp);
 637             is_doomed =  vp->v_iflag & VI_DOOMED;
 638             is_free = vp->v_iflag & VI_FREE;
 639             is_gone = vp->v_iflag & VI_DOINGINACT;
 640             iflag = vp->v_iflag;
 641             VI_UNLOCK(vp);
 642             opens = avc->opens;
 643             afs_warn("afs_close avc %p vp %p opens %d free %d doinginact %d doomed %d iflag %d\n",
 644                      avc, vp, opens, is_free, is_gone, is_doomed, iflag);
 645         }
 646 #endif
 647         avc->opens--;
 648         ReleaseWriteLock(&avc->lock);
 649     }
 650     AFS_DISCON_UNLOCK();
 651     afs_PutFakeStat(&fakestat);
 652
 653     if (code_checkcode) {
 654         code = code_checkcode;
 655     } else {
 656         code = afs_CheckCode(code, treq, 5);
 657     }
 658     afs_DestroyReq(treq);
 659     return code;
 660 }
 661
 662
 663 int
 664 #if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV)
 665 afs_fsync(OSI_VC_DECL(avc), int flag, afs_ucred_t *acred
 666 # ifdef AFS_SGI65_ENV
 667           , off_t start, off_t stop
 668 # endif /* AFS_SGI65_ENV */
 669     )
 670 #else /* !SUN5 && !SGI */
 671 afs_fsync(OSI_VC_DECL(avc), afs_ucred_t *acred)
 672 #endif
 673 {
 674     afs_int32 code;
 675     struct vrequest *treq = NULL;
 676     OSI_VC_CONVERT(avc);
 677
 678     if (avc->vc_error)
 679         return avc->vc_error;
 680
 681 #if defined(AFS_SUN5_ENV)
 682     /* back out if called from NFS server */
 683     if (curthread->t_flag & T_DONTPEND)
 684         return 0;
 685 #endif
 686
 687     AFS_STATCNT(afs_fsync);
 688     afs_Trace1(afs_iclSetp, CM_TRACE_FSYNC, ICL_TYPE_POINTER, avc);
 689     if ((code = afs_CreateReq(&treq, acred)))
 690         return code;
 691     AFS_DISCON_LOCK();
 692 #if defined(AFS_SGI_ENV)
 693     AFS_RWLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 694     if (flag & FSYNC_INVAL)
 695         osi_VM_FSyncInval(avc);
 696 #endif /* AFS_SGI_ENV */
 697
 698     ObtainSharedLock(&avc->lock, 18);
 699     code = 0;
 700     if (avc->execsOrWriters > 0) {
 701         if (!AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
 702             /* Your average flush. */
 703
 704             /* put the file back */
 705             UpgradeSToWLock(&avc->lock, 41);
 706             code = afs_StoreAllSegments(avc, treq, AFS_SYNC);
 707             ConvertWToSLock(&avc->lock);
 708         } else {
 709             UpgradeSToWLock(&avc->lock, 711);
 710             afs_DisconAddDirty(avc, VDisconWriteFlush, 1);
 711             ConvertWToSLock(&avc->lock);
 712         }               /* if not disconnected */
 713     }                   /* if (avc->execsOrWriters > 0) */
 714
 715 #if defined(AFS_SGI_ENV)
 716     AFS_RWUNLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 717     if (code == VNOVNODE) {
 718         /* syncing an unlinked file! - non-informative to pass an errno
 719          * 102 (== VNOVNODE) to user
 720          */
 721         code = ENOENT;
 722     }
 723 #endif
 724     AFS_DISCON_UNLOCK();
 725     code = afs_CheckCode(code, treq, 33);
 726     afs_DestroyReq(treq);
 727     ReleaseSharedLock(&avc->lock);
 728     return code;
 729 }