src/afs/VNOPS/afs_vnop_attrs.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  * Portions Copyright (c) 2003 Apple Computer, Inc.
  10  */
  11
  12 /*
  13  * afs_vnop_attrs.c - setattr and getattr vnodeops
  14  *
  15  * Implements:
  16  * afs_CopyOutAttrs
  17  * afs_getattr
  18  * afs_VAttrToAS
  19  * afs_setattr
  20  * afs_CreateAttr
  21  * afs_DestroyAttr
  22  *
  23  */
  24
  25 #include <afsconfig.h>
  26 #include "afs/param.h"
  27
  28
  29 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  30 #include "afsincludes.h"        /* Afs-based standard headers */
  31 #include "afs/afs_stats.h"      /* statistics */
  32 #include "afs/afs_cbqueue.h"
  33 #include "afs/nfsclient.h"
  34 #include "afs/afs_osidnlc.h"
  35
  36 extern afs_rwlock_t afs_xcbhash;
  37 struct afs_exporter *afs_nfsexporter;
  38 extern struct vcache *afs_globalVp;
  39 #if defined(AFS_HPUX110_ENV)
  40 extern struct vfs *afs_globalVFS;
  41 #endif
  42
  43
  44 /* copy out attributes from cache entry */
  45 int
  46 afs_CopyOutAttrs(struct vcache *avc, struct vattr *attrs)
  47 {
  48     struct volume *tvp;
  49     struct cell *tcell;
  50 #if defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV)
  51     struct vnode *vp = AFSTOV(avc);
  52 #endif
  53     int fakedir = 0;
  54
  55     AFS_STATCNT(afs_CopyOutAttrs);
  56     if (afs_fakestat_enable && avc->mvstat == AFS_MVSTAT_MTPT)
  57         fakedir = 1;
  58     attrs->va_type = fakedir ? VDIR : vType(avc);
  59 #if defined(AFS_SGI_ENV) || defined(AFS_AIX32_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_DARWIN_ENV)
  60     attrs->va_mode = fakedir ? S_IFDIR | 0755 : (mode_t) (avc->f.m.Mode & 0xffff);
  61 #else
  62     attrs->va_mode = fakedir ? VDIR | 0755 : avc->f.m.Mode;
  63 #endif
  64
  65     if (avc->f.m.Mode & (VSUID | VSGID)) {
  66         /* setuid or setgid, make sure we're allowed to run them from this cell */
  67         tcell = afs_GetCell(avc->f.fid.Cell, 0);
  68         if (tcell && (tcell->states & CNoSUID))
  69             attrs->va_mode &= ~(VSUID | VSGID);
  70     }
  71 #if defined(AFS_DARWIN_ENV)
  72     {
  73         if (!afs_darwin_realmodes) {
  74             /* Mac OS X uses the mode bits to determine whether a file or
  75              * directory is accessible, and believes them, even though under
  76              * AFS they're almost assuredly wrong, especially if the local uid
  77              * does not match the AFS ID.  So we set the mode bits
  78              * conservatively.
  79              */
  80             if (S_ISDIR(attrs->va_mode)) {
  81                 /* all access bits need to be set for directories, since even
  82                  * a mode 0 directory can still be used normally.
  83                  */
  84                 attrs->va_mode |= ACCESSPERMS;
  85             } else {
  86                 /* for other files, replicate the user bits to group and other */
  87                 mode_t ubits = (attrs->va_mode & S_IRWXU) >> 6;
  88                 attrs->va_mode |= ubits | (ubits << 3);
  89             }
  90         }
  91     }
  92 #endif /* AFS_DARWIN_ENV */
  93     attrs->va_uid = fakedir ? 0 : avc->f.m.Owner;
  94     attrs->va_gid = fakedir ? 0 : avc->f.m.Group;       /* yeah! */
  95 #if defined(AFS_SUN5_ENV)
  96     attrs->va_fsid = AFSTOV(avc)->v_vfsp->vfs_fsid.val[0];
  97 #elif defined(AFS_DARWIN80_ENV)
  98     VATTR_RETURN(attrs, va_fsid, vfs_statfs(vnode_mount(AFSTOV(avc)))->f_fsid.val[0]);
  99 #elif defined(AFS_DARWIN_ENV)
 100     attrs->va_fsid = avc->v->v_mount->mnt_stat.f_fsid.val[0];
 101 #else /* ! AFS_DARWIN_ENV */
 102     attrs->va_fsid = 1;
 103 #endif
 104     if (avc->mvstat == AFS_MVSTAT_ROOT) {
 105         tvp = afs_GetVolume(&avc->f.fid, 0, READ_LOCK);
 106         /* The mount point's vnode. */
 107         if (tvp) {
 108             attrs->va_nodeid =
 109               afs_calc_inum(tvp->mtpoint.Cell,
 110                             tvp->mtpoint.Fid.Volume,
 111                             tvp->mtpoint.Fid.Vnode);
 112             if (FidCmp(&afs_rootFid, &avc->f.fid) && !attrs->va_nodeid)
 113                 attrs->va_nodeid = 2;
 114             afs_PutVolume(tvp, READ_LOCK);
 115         } else
 116             attrs->va_nodeid = 2;
 117     } else
 118         attrs->va_nodeid =
 119               afs_calc_inum(avc->f.fid.Cell,
 120                             avc->f.fid.Fid.Volume,
 121                             avc->f.fid.Fid.Vnode);
 122     attrs->va_nodeid &= 0x7fffffff;     /* Saber C hates negative inode #s! */
 123     attrs->va_nlink = fakedir ? 100 : avc->f.m.LinkCount;
 124     attrs->va_size = fakedir ? 4096 : avc->f.m.Length;
 125 #if defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV)
 126         vnode_pager_setsize(vp, (u_long) attrs->va_size);
 127 #endif
 128     attrs->va_atime.tv_sec = attrs->va_mtime.tv_sec = attrs->va_ctime.tv_sec =
 129         fakedir ? 0 : (int)avc->f.m.Date;
 130     /* set microseconds to be dataversion # so that we approximate NFS-style
 131      * use of mtime as a dataversion #.  We take it mod 512K because
 132      * microseconds *must* be less than a million, and 512K is the biggest
 133      * power of 2 less than such.  DataVersions are typically pretty small
 134      * anyway, so the difference between 512K and 1000000 shouldn't matter
 135      * much, and "&" is a lot faster than "%".
 136      */
 137 #if defined(AFS_DARWIN_ENV) || defined(AFS_FBSD_ENV)
 138     /* nfs on these systems puts an 0 in nsec and stores the nfs usec (aka
 139      * dataversion) in va_gen */
 140
 141     attrs->va_atime.tv_nsec = attrs->va_mtime.tv_nsec =
 142         attrs->va_ctime.tv_nsec = 0;
 143     attrs->va_gen = hgetlo(avc->f.m.DataVersion);
 144 #elif defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_AIX41_ENV) || defined(AFS_OBSD_ENV) || defined(AFS_NBSD_ENV)
 145     attrs->va_atime.tv_nsec = attrs->va_mtime.tv_nsec =
 146         attrs->va_ctime.tv_nsec =
 147         (hgetlo(avc->f.m.DataVersion) & 0x7ffff) * 1000;
 148 #else
 149     attrs->va_atime.tv_usec = attrs->va_mtime.tv_usec =
 150         attrs->va_ctime.tv_usec = (hgetlo(avc->f.m.DataVersion) & 0x7ffff);
 151 #endif
 152 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 153     attrs->va_flags = 0;
 154 #endif
 155 #if defined(AFS_SGI_ENV) || defined(AFS_SUN5_ENV)
 156     attrs->va_blksize = AFS_BLKSIZE;    /* XXX Was 8192 XXX */
 157 #else
 158     attrs->va_blocksize = AFS_BLKSIZE;  /* XXX Was 8192 XXX */
 159 #endif
 160     attrs->va_rdev = 1;
 161 #if defined(AFS_HPUX110_ENV)
 162     if (afs_globalVFS)
 163         attrs->va_fstype = afs_globalVFS->vfs_mtype;
 164 #endif
 165
 166     /*
 167      * Below return 0 (and not 1) blocks if the file is zero length. This conforms
 168      * better with the other filesystems that do return 0.
 169      */
 170 #if defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 171     attrs->va_bytes = (attrs->va_size ? (attrs->va_size + 1023) : 1024);
 172 #ifdef  va_bytes_rsv
 173     attrs->va_bytes_rsv = -1;
 174 #endif
 175 #elif defined(AFS_HPUX_ENV)
 176     attrs->va_blocks = (attrs->va_size ? ((attrs->va_size + 1023)>>10) : 0);
 177 #elif defined(AFS_SGI_ENV)
 178     attrs->va_blocks = BTOBB(attrs->va_size);
 179 #elif defined(AFS_SUN5_ENV)
 180     attrs->va_nblocks = (attrs->va_size ? ((attrs->va_size + 1023)>>10)<<1:0);
 181 #else /* everything else */
 182     attrs->va_blocks = (attrs->va_size ? ((attrs->va_size + 1023)>>10)<<1:0);
 183 #endif
 184     return 0;
 185 }
 186
 187
 188
 189 #if     defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 190 int
 191 afs_getattr(OSI_VC_DECL(avc), struct vattr *attrs, int flags,
 192             afs_ucred_t *acred)
 193 #else
 194 int
 195 afs_getattr(OSI_VC_DECL(avc), struct vattr *attrs, afs_ucred_t *acred)
 196 #endif
 197 {
 198     afs_int32 code;
 199     struct vrequest *treq = NULL;
 200     struct unixuser *au;
 201     int inited = 0;
 202     OSI_VC_CONVERT(avc);
 203
 204     AFS_STATCNT(afs_getattr);
 205     afs_Trace2(afs_iclSetp, CM_TRACE_GETATTR, ICL_TYPE_POINTER, avc,
 206                ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->f.m.Length));
 207
 208     if (afs_fakestat_enable && avc->mvstat == AFS_MVSTAT_MTPT) {
 209         struct afs_fakestat_state fakestat;
 210         struct vrequest *ureq = NULL;
 211
 212         code = afs_CreateReq(&ureq, acred);
 213         if (code) {
 214             return code;
 215         }
 216         afs_InitFakeStat(&fakestat);
 217         code = afs_TryEvalFakeStat(&avc, &fakestat, ureq);
 218         if (code) {
 219             afs_PutFakeStat(&fakestat);
 220             afs_DestroyReq(ureq);
 221             return code;
 222         }
 223
 224         code = afs_CopyOutAttrs(avc, attrs);
 225         afs_PutFakeStat(&fakestat);
 226         afs_DestroyReq(ureq);
 227         return code;
 228     }
 229 #if defined(AFS_SUN5_ENV)
 230     if (flags & ATTR_HINT) {
 231         code = afs_CopyOutAttrs(avc, attrs);
 232         return code;
 233     }
 234 #endif
 235 #if defined(AFS_DARWIN_ENV) && !defined(AFS_DARWIN80_ENV)
 236     if (avc->f.states & CUBCinit) {
 237         code = afs_CopyOutAttrs(avc, attrs);
 238         return code;
 239     }
 240 #endif
 241
 242     AFS_DISCON_LOCK();
 243
 244     if (afs_shuttingdown != AFS_RUNNING) {
 245         AFS_DISCON_UNLOCK();
 246         return EIO;
 247     }
 248
 249     if (!(avc->f.states & CStatd)) {
 250         if (!(code = afs_CreateReq(&treq, acred))) {
 251             code = afs_VerifyVCache2(avc, treq);
 252             inited = 1;
 253         }
 254     } else
 255         code = 0;
 256
 257 #if defined(AFS_SUN5_ENV)
 258     if (code == 0)
 259         osi_FlushPages(avc, acred);
 260 #endif
 261
 262     if (code == 0) {
 263         osi_FlushText(avc);     /* only needed to flush text if text locked last time */
 264         code = afs_CopyOutAttrs(avc, attrs);
 265
 266         if (afs_nfsexporter) {
 267             if (!inited) {
 268                 if ((code = afs_CreateReq(&treq, acred))) {
 269                     return code;
 270                 }
 271                 inited = 1;
 272             }
 273             if (AFS_NFSXLATORREQ(acred)) {
 274                 if ((vType(avc) != VDIR)
 275                     && !afs_AccessOK(avc, PRSFS_READ, treq,
 276                                      CHECK_MODE_BITS |
 277                                      CMB_ALLOW_EXEC_AS_READ)) {
 278                     afs_DestroyReq(treq);
 279                     return EACCES;
 280                 }
 281             }
 282             if ((au = afs_FindUser(treq->uid, -1, READ_LOCK))) {
 283                 struct afs_exporter *exporter = au->exporter;
 284
 285                 if (exporter && !(afs_nfsexporter->exp_states & EXP_UNIXMODE)) {
 286                     unsigned int ubits;
 287                     /*
 288                      *  If the remote user wishes to enforce default Unix mode semantics,
 289                      *  like in the nfs exporter case, we OR in the user bits
 290                      *  into the group and other bits. We need to do this
 291                      *  because there is no RFS_ACCESS call and thus nfs
 292                      *  clients implement nfs_access by interpreting the
 293                      *  mode bits in the traditional way, which of course
 294                      *  loses with afs.
 295                      */
 296                     ubits = (attrs->va_mode & 0700) >> 6;
 297                     attrs->va_mode = attrs->va_mode | ubits | (ubits << 3);
 298                     /* If it's the root of AFS, replace the inode number with the
 299                      * inode number of the mounted on directory; otherwise this
 300                      * confuses getwd()... */
 301 #ifdef AFS_LINUX22_ENV
 302                     if (avc == afs_globalVp) {
 303                         struct inode *ip = AFSTOV(avc)->i_sb->s_root->d_inode;
 304                         attrs->va_nodeid = ip->i_ino;   /* VTOI()? */
 305                     }
 306 #else
 307                     if (
 308 #if defined(AFS_DARWIN_ENV)
 309                         vnode_isvroot(AFSTOV(avc))
 310 #elif defined(AFS_NBSD50_ENV)
 311                         AFSTOV(avc)->v_vflag & VV_ROOT
 312 #else
 313                         AFSTOV(avc)->v_flag & VROOT
 314 #endif
 315                         ) {
 316                         struct vnode *vp = AFSTOV(avc);
 317
 318 #ifdef AFS_DARWIN80_ENV
 319                         /* XXX vp = vnode_mount(vp)->mnt_vnodecovered; */
 320                         vp = 0;
 321 #else
 322                         vp = vp->v_vfsp->vfs_vnodecovered;
 323                         if (vp) {       /* Ignore weird failures */
 324 #ifdef AFS_SGI62_ENV
 325                             attrs->va_nodeid = VnodeToIno(vp);
 326 #else
 327                             struct inode *ip;
 328
 329                             ip = (struct inode *)VTOI(vp);
 330                             if (ip)     /* Ignore weird failures */
 331                                 attrs->va_nodeid = ip->i_number;
 332 #endif
 333                         }
 334 #endif
 335                     }
 336 #endif /* AFS_LINUX22_ENV */
 337                 }
 338                 afs_PutUser(au, READ_LOCK);
 339             }
 340         }
 341     }
 342
 343     AFS_DISCON_UNLOCK();
 344
 345     if (!code) {
 346         afs_DestroyReq(treq);
 347         return 0;
 348     }
 349     code = afs_CheckCode(code, treq, 14);
 350     afs_DestroyReq(treq);
 351     return code;
 352 }
 353
 354 /* convert a Unix request into a status store request */
 355 int
 356 afs_VAttrToAS(struct vcache *avc, struct vattr *av,
 357               struct AFSStoreStatus *as)
 358 {
 359     int mask;
 360     mask = 0;
 361
 362     AFS_STATCNT(afs_VAttrToAS);
 363 #if     defined(AFS_DARWIN80_ENV)
 364     if (VATTR_IS_ACTIVE(av, va_mode)) {
 365 #elif   defined(AFS_AIX_ENV)
 366 /* Boy, was this machine dependent bogosity hard to swallow????.... */
 367     if (av->va_mode != -1) {
 368 #elif   defined(AFS_LINUX22_ENV) || defined(UKERNEL)
 369     if (av->va_mask & ATTR_MODE) {
 370 #elif   defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 371     if (av->va_mask & AT_MODE) {
 372 #elif   defined(AFS_XBSD_ENV)
 373     if (av->va_mode != (mode_t)VNOVAL) {
 374 #else
 375     if (av->va_mode != ((unsigned short)-1)) {
 376 #endif
 377         mask |= AFS_SETMODE;
 378         as->UnixModeBits = av->va_mode & 0xffff;
 379         if (avc->f.states & CForeign) {
 380             ObtainWriteLock(&avc->lock, 127);
 381             afs_FreeAllAxs(&(avc->Access));
 382             ReleaseWriteLock(&avc->lock);
 383         }
 384     }
 385 #if     defined(AFS_DARWIN80_ENV)
 386     if (VATTR_IS_ACTIVE(av, va_gid)) {
 387 #elif defined(AFS_LINUX22_ENV) || defined(UKERNEL)
 388     if (av->va_mask & ATTR_GID) {
 389 #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 390     if (av->va_mask & AT_GID) {
 391 #elif defined(AFS_HPUX_ENV)
 392 #if     defined(AFS_HPUX102_ENV)
 393     if (av->va_gid != GID_NO_CHANGE) {
 394 #else
 395     if (av->va_gid != ((unsigned short)-1)) {
 396 #endif
 397 #elif   defined(AFS_XBSD_ENV)
 398     if (av->va_gid != (gid_t)VNOVAL) {
 399 #else
 400     if (av->va_gid != -1) {
 401 #endif /* AFS_LINUX22_ENV */
 402         mask |= AFS_SETGROUP;
 403         as->Group = av->va_gid;
 404     }
 405 #if     defined(AFS_DARWIN80_ENV)
 406     if (VATTR_IS_ACTIVE(av, va_uid)) {
 407 #elif defined(AFS_LINUX22_ENV) || defined(UKERNEL)
 408     if (av->va_mask & ATTR_UID) {
 409 #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 410     if (av->va_mask & AT_UID) {
 411 #elif defined(AFS_HPUX_ENV)
 412 #if     defined(AFS_HPUX102_ENV)
 413     if (av->va_uid != UID_NO_CHANGE) {
 414 #elif   defined(AFS_XBSD_ENV)
 415     if (av->va_uid != (uid_t)VNOVAL) {
 416 #else
 417     if (av->va_uid != ((unsigned short)-1)) {
 418 #endif
 419 #else
 420     if (av->va_uid != -1) {
 421 #endif /* AFS_LINUX22_ENV */
 422         mask |= AFS_SETOWNER;
 423         as->Owner = av->va_uid;
 424     }
 425 #if     defined(AFS_DARWIN80_ENV)
 426     if (VATTR_IS_ACTIVE(av, va_modify_time)) {
 427 #elif   defined(AFS_LINUX22_ENV) || defined(UKERNEL)
 428     if (av->va_mask & ATTR_MTIME) {
 429 #elif   defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 430     if (av->va_mask & AT_MTIME) {
 431 #else
 432     if (av->va_mtime.tv_sec != -1) {
 433 #endif
 434         mask |= AFS_SETMODTIME;
 435 #ifndef AFS_SGI_ENV
 436 #if     defined(AFS_SUN5_ENV) || defined(AFS_AIX41_ENV) || defined(AFS_DARWIN_ENV) || defined(AFS_XBSD_ENV)
 437         if (av->va_mtime.tv_nsec == -1)
 438 #else
 439         if (av->va_mtime.tv_usec == -1)
 440 #endif
 441             as->ClientModTime = osi_Time();     /* special Sys V compat hack for Suns */
 442         else
 443 #endif
 444             as->ClientModTime = av->va_mtime.tv_sec;
 445     }
 446     as->Mask = mask;
 447     return 0;
 448 }
 449
 450 /* We don't set CDirty bit in avc->f.states because setattr calls WriteVCache
 451  * synchronously, therefore, it's not needed.
 452  */
 453 #if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 454 int
 455 afs_setattr(OSI_VC_DECL(avc), struct vattr *attrs, int flags,
 456             afs_ucred_t *acred)
 457 #else
 458 int
 459 afs_setattr(OSI_VC_DECL(avc), struct vattr *attrs,
 460             afs_ucred_t *acred)
 461 #endif
 462 {
 463     struct vrequest *treq = NULL;
 464     struct AFSStoreStatus astat;
 465     afs_int32 code;
 466 #if defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV)
 467     struct vnode *vp = AFSTOV(avc);
 468 #endif
 469     struct afs_fakestat_state fakestate;
 470     OSI_VC_CONVERT(avc);
 471
 472     AFS_STATCNT(afs_setattr);
 473 #if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) || defined(AFS_LINUX22_ENV)
 474     afs_Trace4(afs_iclSetp, CM_TRACE_SETATTR, ICL_TYPE_POINTER, avc,
 475                ICL_TYPE_INT32, attrs->va_mask, ICL_TYPE_OFFSET,
 476                ICL_HANDLE_OFFSET(attrs->va_size), ICL_TYPE_OFFSET,
 477                ICL_HANDLE_OFFSET(avc->f.m.Length));
 478 #else
 479     afs_Trace4(afs_iclSetp, CM_TRACE_SETATTR, ICL_TYPE_POINTER, avc,
 480                ICL_TYPE_INT32, attrs->va_mode, ICL_TYPE_OFFSET,
 481                ICL_HANDLE_OFFSET(attrs->va_size), ICL_TYPE_OFFSET,
 482                ICL_HANDLE_OFFSET(avc->f.m.Length));
 483 #endif
 484     if ((code = afs_CreateReq(&treq, acred)))
 485         return code;
 486
 487     memset(&astat, 0, sizeof(astat));
 488
 489     AFS_DISCON_LOCK();
 490
 491     afs_InitFakeStat(&fakestate);
 492     code = afs_EvalFakeStat(&avc, &fakestate, treq);
 493     if (code)
 494         goto done;
 495
 496     if (avc->f.states & CRO) {
 497         code = EROFS;
 498         goto done;
 499     }
 500 #if defined(AFS_SGI_ENV)
 501     /* ignore ATTR_LAZY calls - they are really only for keeping
 502      * the access/mtime of mmaped files up to date
 503      */
 504     if (flags & ATTR_LAZY)
 505         goto done;
 506 #endif
 507     /* if file size has changed, we need write access, otherwise (e.g.
 508      * chmod) give it a shot; if it fails, we'll discard the status
 509      * info.
 510      */
 511 #if     defined(AFS_DARWIN80_ENV)
 512     if (VATTR_IS_ACTIVE(attrs, va_data_size)) {
 513 #elif   defined(AFS_LINUX22_ENV) || defined(UKERNEL)
 514     if (attrs->va_mask & ATTR_SIZE) {
 515 #elif   defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 516     if (attrs->va_mask & AT_SIZE) {
 517 #elif   defined(AFS_XBSD_ENV)
 518     if (attrs->va_size != VNOVAL) {
 519 #elif   defined(AFS_AIX41_ENV)
 520     if (attrs->va_size != -1) {
 521 #else
 522     if (attrs->va_size != ~0) {
 523 #endif
 524         if (!afs_AccessOK(avc, PRSFS_WRITE, treq, DONT_CHECK_MODE_BITS)) {
 525             code = EACCES;
 526             goto done;
 527         }
 528     }
 529
 530     if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
 531         code = ENETDOWN;
 532         goto done;
 533     }
 534
 535     afs_VAttrToAS(avc, attrs, &astat);  /* interpret request */
 536     code = 0;
 537 #if     defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 538     if (AFS_NFSXLATORREQ(acred)) {
 539         avc->execsOrWriters++;
 540     }
 541 #endif
 542
 543 #if defined(AFS_SGI_ENV)
 544     AFS_RWLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 545 #endif
 546 #if     defined(AFS_DARWIN80_ENV)
 547     if (VATTR_IS_ACTIVE(attrs, va_data_size)) {
 548 #elif   defined(AFS_LINUX22_ENV) || defined(UKERNEL)
 549     if (attrs->va_mask & ATTR_SIZE) {
 550 #elif   defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 551     if (attrs->va_mask & AT_SIZE) {
 552 #elif   defined(AFS_XBSD_ENV)
 553     if (attrs->va_size != VNOVAL) {
 554 #elif   defined(AFS_AIX41_ENV)
 555     if (attrs->va_size != -1) {
 556 #else
 557     if (attrs->va_size != ~0) {
 558 #endif
 559         afs_size_t tsize = attrs->va_size;
 560         ObtainWriteLock(&avc->lock, 128);
 561         avc->f.states |= CDirty;
 562
 563         if (AFS_IS_DISCONNECTED && tsize >=avc->f.m.Length) {
 564             /* If we're growing the file, and we're disconnected, we need
 565              * to make the relevant dcache chunks appear ourselves. */
 566             code = afs_ExtendSegments(avc, tsize, treq);
 567         } else {
 568             code = afs_TruncateAllSegments(avc, tsize, treq, acred);
 569         }
 570 #ifdef AFS_LINUX26_ENV
 571         /* We must update the Linux kernel's idea of file size as soon as
 572          * possible, to avoid racing with delayed writepages delivered by
 573          * pdflush */
 574         if (code == 0)
 575             i_size_write(AFSTOV(avc), tsize);
 576 #endif
 577 #if defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV)
 578         vnode_pager_setsize(vp, (u_long) tsize);
 579 #endif
 580         /* if date not explicitly set by this call, set it ourselves, since we
 581          * changed the data */
 582         if (!(astat.Mask & AFS_SETMODTIME)) {
 583             astat.Mask |= AFS_SETMODTIME;
 584             astat.ClientModTime = osi_Time();
 585         }
 586
 587         if (code == 0) {
 588             if (((avc->execsOrWriters <= 0) && (avc->f.states & CCreating) == 0)
 589                 || (avc->execsOrWriters == 1 && AFS_NFSXLATORREQ(acred))) {
 590
 591                 /* Store files now if not disconnected. */
 592                 /* XXX: AFS_IS_DISCON_RW handled. */
 593                 if (!AFS_IS_DISCONNECTED) {
 594                         code = afs_StoreAllSegments(avc, treq, AFS_ASYNC);
 595                         if (!code)
 596                                 avc->f.states &= ~CDirty;
 597                 }
 598             }
 599         } else
 600             avc->f.states &= ~CDirty;
 601
 602         ReleaseWriteLock(&avc->lock);
 603         hzero(avc->flushDV);
 604         osi_FlushText(avc);     /* do this after releasing all locks */
 605     }
 606
 607     if (!AFS_IS_DISCONNECTED) {
 608         if (code == 0) {
 609             ObtainSharedLock(&avc->lock, 16);   /* lock entry */
 610             code = afs_WriteVCache(avc, &astat, treq);  /* send request */
 611             ReleaseSharedLock(&avc->lock);      /* release lock */
 612         }
 613         if (code) {
 614             /* error?  erase any changes we made to vcache entry */
 615             afs_StaleVCache(avc);
 616         }
 617     } else {
 618         ObtainSharedLock(&avc->lock, 712);
 619         /* Write changes locally. */
 620         code = afs_WriteVCacheDiscon(avc, &astat, attrs);
 621         ReleaseSharedLock(&avc->lock);
 622     }           /* if (!AFS_IS_DISCONNECTED) */
 623
 624 #if     defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 625     if (AFS_NFSXLATORREQ(acred)) {
 626         avc->execsOrWriters--;
 627     }
 628 #endif
 629 #if defined(AFS_SGI_ENV)
 630     AFS_RWUNLOCK((vnode_t *) avc, VRWLOCK_WRITE);
 631 #endif
 632   done:
 633     afs_PutFakeStat(&fakestate);
 634
 635     AFS_DISCON_UNLOCK();
 636     code = afs_CheckCode(code, treq, 15);
 637     afs_DestroyReq(treq);
 638     return code;
 639 }
 640
 641 /*!
 642  * Allocate a vattr.
 643  *
 644  * \note The caller must free the allocated vattr with
 645  *       afs_DestroyAttr() if this function returns successfully (zero).
 646  *
 647  * \note The GLOCK must be held on platforms which require the GLOCK
 648  *       for osi_AllocSmallSpace() and osi_FreeSmallSpace().
 649  *
 650  * \param[out] out   address of the vattr pointer
 651  * \return     0 on success
 652  */
 653 int
 654 afs_CreateAttr(struct vattr **out)
 655 {
 656     struct vattr *vattr = NULL;
 657
 658     if (!out) {
 659         return EINVAL;
 660     }
 661     vattr = osi_AllocSmallSpace(sizeof(struct vattr));
 662     if (!vattr) {
 663         return ENOMEM;
 664     }
 665     memset(vattr, 0, sizeof(struct vattr));
 666     *out = vattr;
 667     return 0;
 668 }
 669
 670 /*!
 671  * Deallocate a vattr.
 672  *
 673  * \note The GLOCK must be held on platforms which require the GLOCK
 674  *       for osi_FreeSmallSpace().
 675  *
 676  * \param[in]  vattr  pointer to the vattr to free; may be NULL
 677  */
 678 void
 679 afs_DestroyAttr(struct vattr *vattr)
 680 {
 681     if (vattr) {
 682         osi_FreeSmallSpace(vattr);
 683     }
 684 }
 685