src/afs/VNOPS/afs_vnop_dirops.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  * afs_vnop_dirops.c - make and remove directories
  12  *
  13  * Implements:
  14  *
  15  * afs_mkdir
  16  * afs_rmdir
  17  *
  18  */
  19
  20 #include <afsconfig.h>
  21 #include "afs/param.h"
  22
  23
  24 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  25 #include "afsincludes.h"        /* Afs-based standard headers */
  26 #include "afs/afs_stats.h"      /* statistics */
  27 #include "afs/afs_cbqueue.h"
  28 #include "afs/nfsclient.h"
  29 #include "afs/afs_osidnlc.h"
  30
  31 extern afs_rwlock_t afs_xvcache;
  32 extern afs_rwlock_t afs_xcbhash;
  33
  34 /* don't set CDirty in here because RPC is called synchronously */
  35
  36 int
  37 afs_mkdir(OSI_VC_DECL(adp), char *aname, struct vattr *attrs,
  38      struct vcache **avcp, afs_ucred_t *acred)
  39 {
  40     struct vrequest *treq = NULL;
  41     afs_int32 code;
  42     struct afs_conn *tc;
  43     struct rx_connection *rxconn;
  44     struct VenusFid newFid;
  45     struct dcache *tdc;
  46     struct dcache *new_dc;
  47     afs_size_t offset, len;
  48     struct vcache *tvc;
  49     struct AFSStoreStatus InStatus;
  50     struct AFSFetchStatus *OutFidStatus, *OutDirStatus;
  51     struct AFSCallBack CallBack;
  52     struct AFSVolSync tsync;
  53     afs_int32 now;
  54     struct afs_fakestat_state fakestate;
  55     XSTATS_DECLS;
  56     OSI_VC_CONVERT(adp);
  57
  58     AFS_STATCNT(afs_mkdir);
  59     afs_Trace2(afs_iclSetp, CM_TRACE_MKDIR, ICL_TYPE_POINTER, adp,
  60                ICL_TYPE_STRING, aname);
  61
  62     OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
  63     OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
  64     memset(&InStatus, 0, sizeof(InStatus));
  65
  66     if ((code = afs_CreateReq(&treq, acred)))
  67         goto done2;
  68     afs_InitFakeStat(&fakestate);
  69
  70     if (strlen(aname) > AFSNAMEMAX) {
  71         code = ENAMETOOLONG;
  72         goto done3;
  73     }
  74
  75     if (!afs_ENameOK(aname)) {
  76         code = EINVAL;
  77         goto done3;
  78     }
  79
  80     AFS_DISCON_LOCK();
  81
  82     code = afs_EvalFakeStat(&adp, &fakestate, treq);
  83     if (code)
  84         goto done;
  85     code = afs_VerifyVCache(adp, treq);
  86     if (code)
  87         goto done;
  88
  89     /** If the volume is read-only, return error without making an RPC to the
  90       * fileserver
  91       */
  92     if (adp->f.states & CRO) {
  93         code = EROFS;
  94         goto done;
  95     }
  96
  97     if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
  98         /*printf("Network is down in afs_mkdir\n");*/
  99         code = ENETDOWN;
 100         goto done;
 101     }
 102     InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE | AFS_SETGROUP;
 103     InStatus.ClientModTime = osi_Time();
 104     InStatus.UnixModeBits = attrs->va_mode & 0xffff;    /* only care about protection bits */
 105     InStatus.Group = (afs_int32) afs_cr_gid(acred);
 106     tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1);
 107     ObtainWriteLock(&adp->lock, 153);
 108
 109     if (!AFS_IS_DISCON_RW) {
 110         do {
 111             tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn);
 112             if (tc) {
 113                 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_MAKEDIR);
 114                 now = osi_Time();
 115                 RX_AFS_GUNLOCK();
 116                 code =
 117                     RXAFS_MakeDir(rxconn,
 118                                 (struct AFSFid *)&adp->f.fid.Fid,
 119                                 aname,
 120                                 &InStatus,
 121                                 (struct AFSFid *)&newFid.Fid,
 122                                 OutFidStatus,
 123                                 OutDirStatus,
 124                                 &CallBack,
 125                                 &tsync);
 126                 RX_AFS_GLOCK();
 127                 XSTATS_END_TIME;
 128                 CallBack.ExpirationTime += now;
 129                 /* DON'T forget to Set the callback value... */
 130             } else
 131                 code = -1;
 132         } while (afs_Analyze
 133                     (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_MAKEDIR,
 134                      SHARED_LOCK, NULL));
 135
 136         if (code) {
 137             if (code < 0) {
 138                 afs_StaleVCache(adp);
 139             }
 140             ReleaseWriteLock(&adp->lock);
 141             if (tdc)
 142                 afs_PutDCache(tdc);
 143             goto done;
 144         }
 145
 146     } else {
 147         /* Disconnected. */
 148
 149         /* We have the dir entry now, we can use it while disconnected. */
 150         if (adp->mvid.target_root == NULL) {
 151             /* If not mount point, generate a new fid. */
 152             newFid.Cell = adp->f.fid.Cell;
 153             newFid.Fid.Volume = adp->f.fid.Fid.Volume;
 154             afs_GenFakeFid(&newFid, VDIR, 1);
 155         }
 156         /* XXX: If mount point???*/
 157
 158         /* Operations with the actual dir's cache entry are further
 159          * down, where the dir entry gets created.
 160          */
 161     }                   /* if (!AFS_IS_DISCON_RW) */
 162
 163     /* otherwise, we should see if we can make the change to the dir locally */
 164     if (tdc)
 165         ObtainWriteLock(&tdc->lock, 632);
 166     if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) {
 167         /* we can do it locally */
 168         ObtainWriteLock(&afs_xdcache, 294);
 169         code = afs_dir_Create(tdc, aname, &newFid.Fid);
 170         ReleaseWriteLock(&afs_xdcache);
 171         if (code) {
 172             ZapDCE(tdc);        /* surprise error -- use invalid value */
 173             DZap(tdc);
 174         }
 175     }
 176     if (tdc) {
 177         ReleaseWriteLock(&tdc->lock);
 178         afs_PutDCache(tdc);
 179     }
 180
 181     if (AFS_IS_DISCON_RW)
 182         /* We will have to settle with the local link count. */
 183         adp->f.m.LinkCount++;
 184     else
 185         adp->f.m.LinkCount = OutDirStatus->LinkCount;
 186     newFid.Cell = adp->f.fid.Cell;
 187     newFid.Fid.Volume = adp->f.fid.Fid.Volume;
 188     ReleaseWriteLock(&adp->lock);
 189     if (AFS_IS_DISCON_RW) {
 190         /* When disconnected, we have to create the full dir here. */
 191
 192         /* Generate a new vcache and fill it. */
 193         tvc = afs_NewVCache(&newFid, NULL);
 194         if (tvc) {
 195             *avcp = tvc;
 196         } else {
 197             code = EIO;
 198             goto done;
 199         }
 200
 201         ObtainWriteLock(&tvc->lock, 738);
 202         afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VDIR);
 203         ReleaseWriteLock(&tvc->lock);
 204
 205         /* And now make an empty dir, containing . and .. : */
 206         /* Get a new dcache for it first. */
 207         new_dc = afs_GetDCache(tvc, (afs_size_t) 0, treq, &offset, &len, 1);
 208         if (!new_dc) {
 209             /* printf("afs_mkdir: can't get new dcache for dir.\n"); */
 210             code = EIO;
 211             goto done;
 212         }
 213
 214         ObtainWriteLock(&afs_xdcache, 739);
 215         code = afs_dir_MakeDir(new_dc,
 216                                (afs_int32 *) &newFid.Fid,
 217                                (afs_int32 *) &adp->f.fid.Fid);
 218         ReleaseWriteLock(&afs_xdcache);
 219         /* if (code) printf("afs_mkdir: afs_dirMakeDir code = %u\n", code); */
 220
 221         afs_PutDCache(new_dc);
 222
 223         ObtainWriteLock(&tvc->lock, 731);
 224         /* Update length in the vcache. */
 225         tvc->f.m.Length = new_dc->f.chunkBytes;
 226
 227         afs_DisconAddDirty(tvc, VDisconCreate, 1);
 228         ReleaseWriteLock(&tvc->lock);
 229     } else {
 230         /* now we're done with parent dir, create the real dir's cache entry */
 231         tvc = afs_GetVCache(&newFid, treq, NULL, NULL);
 232         if (tvc) {
 233             code = 0;
 234             *avcp = tvc;
 235
 236         } else {
 237             /* For some reason, we cannot fetch the vcache for our
 238              * newly-created dir. */
 239             code = EIO;
 240         }
 241     }                           /* if (AFS_DISCON_RW) */
 242
 243   done:
 244     AFS_DISCON_UNLOCK();
 245   done3:
 246     afs_PutFakeStat(&fakestate);
 247     code = afs_CheckCode(code, treq, 26);
 248     afs_DestroyReq(treq);
 249   done2:
 250     osi_FreeSmallSpace(OutFidStatus);
 251     osi_FreeSmallSpace(OutDirStatus);
 252     return code;
 253 }
 254
 255
 256 int
 257 /* don't set CDirty in here because RPC is called synchronously */
 258 #if     defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV)
 259 afs_rmdir(OSI_VC_DECL(adp), char *aname, struct vnode *cdirp,
 260           afs_ucred_t *acred)
 261 #else
 262 afs_rmdir(OSI_VC_DECL(adp), char *aname, afs_ucred_t *acred)
 263 #endif
 264 {
 265     struct vrequest *treq = NULL;
 266     struct dcache *tdc;
 267     struct vcache *tvc = NULL;
 268     afs_int32 code;
 269     struct afs_conn *tc;
 270     afs_size_t offset, len;
 271     struct AFSFetchStatus OutDirStatus;
 272     struct AFSVolSync tsync;
 273     struct afs_fakestat_state fakestate;
 274     struct rx_connection *rxconn;
 275     XSTATS_DECLS;
 276     OSI_VC_CONVERT(adp);
 277
 278     AFS_STATCNT(afs_rmdir);
 279
 280     afs_Trace2(afs_iclSetp, CM_TRACE_RMDIR, ICL_TYPE_POINTER, adp,
 281                ICL_TYPE_STRING, aname);
 282
 283     if ((code = afs_CreateReq(&treq, acred)))
 284         goto done2;
 285     afs_InitFakeStat(&fakestate);
 286
 287     if (strlen(aname) > AFSNAMEMAX) {
 288         code = ENAMETOOLONG;
 289         goto done;
 290     }
 291
 292     AFS_DISCON_LOCK();
 293
 294     code = afs_EvalFakeStat(&adp, &fakestate, treq);
 295     if (code)
 296         goto done;
 297
 298     code = afs_VerifyVCache(adp, treq);
 299     if (code)
 300         goto done;
 301
 302     /** If the volume is read-only, return error without making an RPC to the
 303       * fileserver
 304       */
 305     if (adp->f.states & CRO) {
 306         code = EROFS;
 307         goto done;
 308     }
 309
 310    if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
 311         /* Disconnected read only mode. */
 312         code = ENETDOWN;
 313         goto done;
 314     }
 315
 316     tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1);   /* test for error below */
 317     ObtainWriteLock(&adp->lock, 154);
 318     if (tdc)
 319         ObtainSharedLock(&tdc->lock, 633);
 320     if (tdc && (adp->f.states & CForeign)) {
 321         struct VenusFid unlinkFid;
 322
 323         unlinkFid.Fid.Vnode = 0;
 324         code = afs_dir_Lookup(tdc, aname, &unlinkFid.Fid);
 325         if (code == 0) {
 326             afs_int32 cached = 0;
 327
 328             unlinkFid.Cell = adp->f.fid.Cell;
 329             unlinkFid.Fid.Volume = adp->f.fid.Fid.Volume;
 330             if (unlinkFid.Fid.Unique == 0) {
 331                 tvc =
 332                     afs_LookupVCache(&unlinkFid, treq, &cached, adp, aname);
 333             } else {
 334                 ObtainReadLock(&afs_xvcache);
 335                 tvc = afs_FindVCache(&unlinkFid, 0, 1 /* do xstats */ );
 336                 ReleaseReadLock(&afs_xvcache);
 337             }
 338         }
 339     }
 340
 341     if (!AFS_IS_DISCON_RW) {
 342         /* Not disconnected, can connect to server. */
 343         do {
 344             tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn);
 345             if (tc) {
 346                 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_REMOVEDIR);
 347                 RX_AFS_GUNLOCK();
 348                 code =
 349                     RXAFS_RemoveDir(rxconn,
 350                                 (struct AFSFid *)&adp->f.fid.Fid,
 351                                 aname,
 352                                 &OutDirStatus,
 353                                 &tsync);
 354                 RX_AFS_GLOCK();
 355                 XSTATS_END_TIME;
 356             } else
 357                 code = -1;
 358         } while (afs_Analyze
 359                  (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_REMOVEDIR,
 360                  SHARED_LOCK, NULL));
 361
 362         if (code) {
 363             if (tdc) {
 364                 ReleaseSharedLock(&tdc->lock);
 365                 afs_PutDCache(tdc);
 366             }
 367
 368             if (code < 0) {
 369                 afs_StaleVCache(adp);
 370             }
 371             ReleaseWriteLock(&adp->lock);
 372             goto done;
 373         }
 374
 375         /* here if rpc worked; update the in-core link count */
 376         adp->f.m.LinkCount = OutDirStatus.LinkCount;
 377
 378     } else {
 379         /* Disconnected. */
 380
 381         if (!tdc) {
 382             ReleaseWriteLock(&adp->lock);
 383             /* printf("afs_rmdir: No local dcache!\n"); */
 384             code = ENETDOWN;
 385             goto done;
 386         }
 387
 388         if (!tvc) {
 389             /* Find the vcache. */
 390             struct VenusFid tfid;
 391
 392             tfid.Cell = adp->f.fid.Cell;
 393             tfid.Fid.Volume = adp->f.fid.Fid.Volume;
 394             code = afs_dir_Lookup(tdc, aname, &tfid.Fid);
 395
 396             ObtainSharedLock(&afs_xvcache, 764);
 397             tvc = afs_FindVCache(&tfid, 0, 1 /* do xstats */ );
 398             ReleaseSharedLock(&afs_xvcache);
 399
 400             if (!tvc) {
 401                 /* printf("afs_rmdir: Can't find dir's vcache!\n"); */
 402                 ReleaseSharedLock(&tdc->lock);
 403                 afs_PutDCache(tdc);     /* drop ref count */
 404                 ReleaseWriteLock(&adp->lock);
 405                 code = ENETDOWN;
 406                 goto done;
 407             }
 408         }
 409
 410         if (tvc->f.m.LinkCount > 2) {
 411             /* This dir contains more than . and .., thus it can't be
 412              * deleted.
 413              */
 414             ReleaseSharedLock(&tdc->lock);
 415             afs_PutDCache(tdc);
 416             afs_PutVCache(tvc);
 417             ReleaseWriteLock(&adp->lock);
 418             code = ENOTEMPTY;
 419             goto done;
 420         }
 421
 422         /* Make a shadow copy of the parent dir (if not done already).
 423          * If we were created locally, then we don't need to have a shadow
 424          * directory (as there's no server state to remember)
 425          */
 426         if (!adp->f.shadow.vnode && !(adp->f.ddirty_flags & VDisconCreate)) {
 427             afs_MakeShadowDir(adp, tdc);
 428         }
 429
 430         adp->f.m.LinkCount--;
 431     }                           /* if (!AFS_IS_DISCON_RW) */
 432
 433     if (tdc)
 434         UpgradeSToWLock(&tdc->lock, 634);
 435     if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, &OutDirStatus, 1)) {
 436         /* we can do it locally */
 437         code = afs_dir_Delete(tdc, aname);
 438         if (code) {
 439             ZapDCE(tdc);        /* surprise error -- invalid value */
 440             DZap(tdc);
 441         }
 442     }
 443     if (tdc) {
 444         ReleaseWriteLock(&tdc->lock);
 445         afs_PutDCache(tdc);     /* drop ref count */
 446     }
 447
 448     if (tvc)
 449         osi_dnlc_purgedp(tvc);  /* get rid of any entries for this directory */
 450     else
 451         osi_dnlc_remove(adp, aname, 0);
 452
 453     if (tvc) {
 454         ObtainWriteLock(&tvc->lock, 155);
 455         tvc->f.states &= ~CUnique;      /* For the dfs xlator */
 456         if (AFS_IS_DISCON_RW) {
 457             if (tvc->f.ddirty_flags & VDisconCreate) {
 458                 /* If we we were created whilst disconnected, removal doesn't
 459                  * need to get logged. Just go away gracefully */
 460                 afs_DisconRemoveDirty(tvc);
 461             } else {
 462                 afs_DisconAddDirty(tvc, VDisconRemove, 1);
 463             }
 464         }
 465         ReleaseWriteLock(&tvc->lock);
 466         afs_PutVCache(tvc);
 467     }
 468     ReleaseWriteLock(&adp->lock);
 469     /* don't worry about link count since dirs can not be hardlinked */
 470     code = 0;
 471
 472   done:
 473     AFS_DISCON_UNLOCK();
 474     afs_PutFakeStat(&fakestate);
 475     code = afs_CheckCode(code, treq, 27);
 476     afs_DestroyReq(treq);
 477   done2:
 478     return code;
 479 }