src/afs/VNOPS/afs_vnop_rename.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  * afsrename
  13  * afs_rename
  14  *
  15  */
  16
  17 #include <afsconfig.h>
  18 #include "afs/param.h"
  19
  20
  21 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  22 #include "afsincludes.h"        /* Afs-based standard headers */
  23 #include "afs/afs_stats.h"      /* statistics */
  24 #include "afs/afs_cbqueue.h"
  25 #include "afs/nfsclient.h"
  26 #include "afs/afs_osidnlc.h"
  27
  28 extern afs_rwlock_t afs_xcbhash;
  29
  30 /* Note that we don't set CDirty here, this is OK because the rename
  31  * RPC is called synchronously. */
  32
  33 int
  34 afsrename(struct vcache *aodp, char *aname1, struct vcache *andp,
  35           char *aname2, afs_ucred_t *acred, struct vrequest *areq)
  36 {
  37     struct afs_conn *tc;
  38     afs_int32 code = 0;
  39     afs_int32 returnCode;
  40     int oneDir, doLocally;
  41     afs_size_t offset, len;
  42     struct VenusFid unlinkFid, fileFid;
  43     struct vcache *tvc;
  44     struct dcache *tdc1, *tdc2;
  45     struct AFSFetchStatus *OutOldDirStatus, *OutNewDirStatus;
  46     struct AFSVolSync tsync;
  47     struct rx_connection *rxconn;
  48     XSTATS_DECLS;
  49     AFS_STATCNT(afs_rename);
  50     afs_Trace4(afs_iclSetp, CM_TRACE_RENAME, ICL_TYPE_POINTER, aodp,
  51                ICL_TYPE_STRING, aname1, ICL_TYPE_POINTER, andp,
  52                ICL_TYPE_STRING, aname2);
  53
  54     OutOldDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
  55     OutNewDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus));
  56
  57     if (strlen(aname1) > AFSNAMEMAX || strlen(aname2) > AFSNAMEMAX) {
  58         code = ENAMETOOLONG;
  59         goto done;
  60     }
  61
  62     /* verify the latest versions of the stat cache entries */
  63   tagain:
  64     code = afs_VerifyVCache(aodp, areq);
  65     if (code)
  66         goto done;
  67     code = afs_VerifyVCache(andp, areq);
  68     if (code)
  69         goto done;
  70
  71     /* lock in appropriate order, after some checks */
  72     if (aodp->f.fid.Cell != andp->f.fid.Cell
  73         || aodp->f.fid.Fid.Volume != andp->f.fid.Fid.Volume) {
  74         code = EXDEV;
  75         goto done;
  76     }
  77     oneDir = 0;
  78     code = 0;
  79     if (andp->f.fid.Fid.Vnode == aodp->f.fid.Fid.Vnode) {
  80         if (!strcmp(aname1, aname2)) {
  81             /* Same directory and same name; this is a noop and just return success
  82              * to save cycles and follow posix standards */
  83
  84             code = 0;
  85             goto done;
  86         }
  87
  88         if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
  89             code = ENETDOWN;
  90             goto done;
  91         }
  92
  93         ObtainWriteLock(&andp->lock, 147);
  94         tdc1 = afs_GetDCache(aodp, (afs_size_t) 0, areq, &offset, &len, 0);
  95         if (!tdc1) {
  96             code = EIO;
  97         } else {
  98             ObtainWriteLock(&tdc1->lock, 643);
  99         }
 100         tdc2 = tdc1;
 101         oneDir = 1;             /* only one dude locked */
 102     } else if ((andp->f.states & CRO) || (aodp->f.states & CRO)) {
 103         code = EROFS;
 104         goto done;
 105     } else if (andp->f.fid.Fid.Vnode < aodp->f.fid.Fid.Vnode) {
 106         ObtainWriteLock(&andp->lock, 148);      /* lock smaller one first */
 107         ObtainWriteLock(&aodp->lock, 149);
 108         tdc2 = afs_FindDCache(andp, (afs_size_t) 0);
 109         if (tdc2)
 110             ObtainWriteLock(&tdc2->lock, 644);
 111         tdc1 = afs_GetDCache(aodp, (afs_size_t) 0, areq, &offset, &len, 0);
 112         if (tdc1)
 113             ObtainWriteLock(&tdc1->lock, 645);
 114         else
 115             code = EIO;
 116     } else {
 117         ObtainWriteLock(&aodp->lock, 150);      /* lock smaller one first */
 118         ObtainWriteLock(&andp->lock, 557);
 119         tdc1 = afs_GetDCache(aodp, (afs_size_t) 0, areq, &offset, &len, 0);
 120         if (tdc1)
 121             ObtainWriteLock(&tdc1->lock, 646);
 122         else
 123             code = EIO;
 124         tdc2 = afs_FindDCache(andp, (afs_size_t) 0);
 125         if (tdc2)
 126             ObtainWriteLock(&tdc2->lock, 647);
 127     }
 128
 129     osi_dnlc_remove(aodp, aname1, 0);
 130     osi_dnlc_remove(andp, aname2, 0);
 131
 132     /*
 133      * Make sure that the data in the cache is current. We may have
 134      * received a callback while we were waiting for the write lock.
 135      */
 136     if (tdc1) {
 137         if (!(aodp->f.states & CStatd)
 138             || !hsame(aodp->f.m.DataVersion, tdc1->f.versionNo)) {
 139
 140             ReleaseWriteLock(&aodp->lock);
 141             if (!oneDir) {
 142                 if (tdc2) {
 143                     ReleaseWriteLock(&tdc2->lock);
 144                     afs_PutDCache(tdc2);
 145                 }
 146                 ReleaseWriteLock(&andp->lock);
 147             }
 148             ReleaseWriteLock(&tdc1->lock);
 149             afs_PutDCache(tdc1);
 150             goto tagain;
 151         }
 152     }
 153
 154     if (code == 0)
 155         code = afs_dir_Lookup(tdc1, aname1, &fileFid.Fid);
 156     if (code) {
 157         if (tdc1) {
 158             ReleaseWriteLock(&tdc1->lock);
 159             afs_PutDCache(tdc1);
 160         }
 161         ReleaseWriteLock(&aodp->lock);
 162         if (!oneDir) {
 163             if (tdc2) {
 164                 ReleaseWriteLock(&tdc2->lock);
 165                 afs_PutDCache(tdc2);
 166             }
 167             ReleaseWriteLock(&andp->lock);
 168         }
 169         goto done;
 170     }
 171
 172     if (!AFS_IS_DISCON_RW) {
 173         /* Connected. */
 174         do {
 175             tc = afs_Conn(&aodp->f.fid, areq, SHARED_LOCK, &rxconn);
 176             if (tc) {
 177                 XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_RENAME);
 178                 RX_AFS_GUNLOCK();
 179                 code =
 180                     RXAFS_Rename(rxconn,
 181                                         (struct AFSFid *)&aodp->f.fid.Fid,
 182                                         aname1,
 183                                         (struct AFSFid *)&andp->f.fid.Fid,
 184                                         aname2,
 185                                         OutOldDirStatus,
 186                                         OutNewDirStatus,
 187                                         &tsync);
 188                 RX_AFS_GLOCK();
 189                 XSTATS_END_TIME;
 190             } else
 191                 code = -1;
 192
 193         } while (afs_Analyze
 194              (tc, rxconn, code, &andp->f.fid, areq, AFS_STATS_FS_RPCIDX_RENAME,
 195               SHARED_LOCK, NULL));
 196
 197     } else {
 198         /* Disconnected. */
 199
 200         /* Seek moved file vcache. */
 201         fileFid.Cell = aodp->f.fid.Cell;
 202         fileFid.Fid.Volume = aodp->f.fid.Fid.Volume;
 203         ObtainSharedLock(&afs_xvcache, 754);
 204         tvc = afs_FindVCache(&fileFid, 0 , 1);
 205         ReleaseSharedLock(&afs_xvcache);
 206
 207         if (tvc) {
 208             /* XXX - We're locking this vcache whilst holding dcaches. Ooops */
 209             ObtainWriteLock(&tvc->lock, 750);
 210             if (!(tvc->f.ddirty_flags & (VDisconRename|VDisconCreate))) {
 211                 /* If the vnode was created locally, then we don't care
 212                  * about recording the rename - we'll do it automatically
 213                  * on replay. If we've already renamed, we've already stored
 214                  * the required information about where we came from.
 215                  */
 216
 217                 if (!aodp->f.shadow.vnode) {
 218                     /* Make shadow copy of parent dir only. */
 219                     afs_MakeShadowDir(aodp, tdc1);
 220                 }
 221
 222                 /* Save old parent dir fid so it will be searchable
 223                  * in the shadow dir.
 224                  */
 225                 tvc->f.oldParent.vnode = aodp->f.fid.Fid.Vnode;
 226                 tvc->f.oldParent.unique = aodp->f.fid.Fid.Unique;
 227
 228                 afs_DisconAddDirty(tvc,
 229                                    VDisconRename
 230                                      | (oneDir ? VDisconRenameSameDir:0),
 231                                    1);
 232             }
 233
 234             ReleaseWriteLock(&tvc->lock);
 235             afs_PutVCache(tvc);
 236         } else {
 237             code = ENETDOWN;
 238         }                       /* if (tvc) */
 239     }                           /* if !(AFS_IS_DISCON_RW)*/
 240     returnCode = code;          /* remember for later */
 241
 242     /* Now we try to do things locally.  This is really loathsome code. */
 243     unlinkFid.Fid.Vnode = 0;
 244     if (code == 0) {
 245         /*  In any event, we don't really care if the data (tdc2) is not
 246          * in the cache; if it isn't, we won't do the update locally.  */
 247         /* see if version numbers increased properly */
 248         doLocally = 1;
 249         if (!AFS_IS_DISCON_RW) {
 250             if (oneDir) {
 251                 /* number increases by 1 for whole rename operation */
 252                 if (!afs_LocalHero(aodp, tdc1, OutOldDirStatus, 1)) {
 253                     doLocally = 0;
 254                 }
 255             } else {
 256                 /* two separate dirs, each increasing by 1 */
 257                 if (!afs_LocalHero(aodp, tdc1, OutOldDirStatus, 1))
 258                     doLocally = 0;
 259                 if (!afs_LocalHero(andp, tdc2, OutNewDirStatus, 1))
 260                     doLocally = 0;
 261                 if (!doLocally) {
 262                     if (tdc1) {
 263                         ZapDCE(tdc1);
 264                         DZap(tdc1);
 265                     }
 266                     if (tdc2) {
 267                         ZapDCE(tdc2);
 268                         DZap(tdc2);
 269                     }
 270                 }
 271             }
 272         }                       /* if (!AFS_IS_DISCON_RW) */
 273
 274         /* now really do the work */
 275         if (doLocally) {
 276             /* first lookup the fid of the dude we're moving */
 277             code = afs_dir_Lookup(tdc1, aname1, &fileFid.Fid);
 278             if (code == 0) {
 279                 /* delete the source */
 280                 code = afs_dir_Delete(tdc1, aname1);
 281             }
 282             /* first see if target is there */
 283             if (code == 0
 284                 && afs_dir_Lookup(tdc2, aname2,
 285                                   &unlinkFid.Fid) == 0) {
 286                 /* target already exists, and will be unlinked by server */
 287                 code = afs_dir_Delete(tdc2, aname2);
 288             }
 289             if (code == 0) {
 290                 ObtainWriteLock(&afs_xdcache, 292);
 291                 code = afs_dir_Create(tdc2, aname2, &fileFid.Fid);
 292                 ReleaseWriteLock(&afs_xdcache);
 293             }
 294             if (code != 0) {
 295                 ZapDCE(tdc1);
 296                 DZap(tdc1);
 297                 if (!oneDir) {
 298                     ZapDCE(tdc2);
 299                     DZap(tdc2);
 300                 }
 301             }
 302         }
 303
 304
 305         /* update dir link counts */
 306         if (AFS_IS_DISCON_RW) {
 307             if (!oneDir) {
 308                 aodp->f.m.LinkCount--;
 309                 andp->f.m.LinkCount++;
 310             }
 311             /* If we're in the same directory, link count doesn't change */
 312         } else {
 313             aodp->f.m.LinkCount = OutOldDirStatus->LinkCount;
 314             if (!oneDir)
 315                 andp->f.m.LinkCount = OutNewDirStatus->LinkCount;
 316         }
 317
 318     } else {                    /* operation failed (code != 0) */
 319         if (code < 0) {
 320             /* if failed, server might have done something anyway, and
 321              * assume that we know about it */
 322             ObtainWriteLock(&afs_xcbhash, 498);
 323             afs_StaleVCacheFlags(aodp, AFS_STALEVC_CBLOCKED, 0);
 324             afs_StaleVCacheFlags(andp, AFS_STALEVC_CBLOCKED, 0);
 325             ReleaseWriteLock(&afs_xcbhash);
 326         }
 327     }
 328
 329     /* release locks */
 330     if (tdc1) {
 331         ReleaseWriteLock(&tdc1->lock);
 332         afs_PutDCache(tdc1);
 333     }
 334
 335     if ((!oneDir) && tdc2) {
 336         ReleaseWriteLock(&tdc2->lock);
 337         afs_PutDCache(tdc2);
 338     }
 339
 340     ReleaseWriteLock(&aodp->lock);
 341
 342     if (!oneDir) {
 343         ReleaseWriteLock(&andp->lock);
 344     }
 345
 346     if (returnCode) {
 347         code = returnCode;
 348         goto done;
 349     }
 350
 351     /* now, some more details.  if unlinkFid.Fid.Vnode then we should decrement
 352      * the link count on this file.  Note that if fileFid is a dir, then we don't
 353      * have to invalidate its ".." entry, since its DataVersion # should have
 354      * changed. However, interface is not good enough to tell us the
 355      * *file*'s new DataVersion, so we're stuck.  Our hack: delete mark
 356      * the data as having an "unknown" version (effectively discarding the ".."
 357      * entry */
 358     if (unlinkFid.Fid.Vnode) {
 359
 360         unlinkFid.Fid.Volume = aodp->f.fid.Fid.Volume;
 361         unlinkFid.Cell = aodp->f.fid.Cell;
 362         tvc = NULL;
 363         if (!unlinkFid.Fid.Unique) {
 364             tvc = afs_LookupVCache(&unlinkFid, areq, NULL, aodp, aname1);
 365         }
 366         if (!tvc)               /* lookup failed or wasn't called */
 367             tvc = afs_GetVCache(&unlinkFid, areq, NULL, NULL);
 368
 369         if (tvc) {
 370             ObtainWriteLock(&tvc->lock, 151);
 371             tvc->f.m.LinkCount--;
 372             tvc->f.states &= ~CUnique;  /* For the dfs xlator */
 373             if (tvc->f.m.LinkCount == 0 && !osi_Active(tvc)) {
 374                 /* if this was last guy (probably) discard from cache.
 375                  * We have to be careful to not get rid of the stat
 376                  * information, since otherwise operations will start
 377                  * failing even if the file was still open (or
 378                  * otherwise active), and the server no longer has the
 379                  * info.  If the file still has valid links, we'll get
 380                  * a break-callback msg from the server, so it doesn't
 381                  * matter that we don't discard the status info */
 382                 if (!AFS_NFSXLATORREQ(acred))
 383                     afs_TryToSmush(tvc, acred, 0);
 384             }
 385             ReleaseWriteLock(&tvc->lock);
 386             afs_PutVCache(tvc);
 387         }
 388     }
 389
 390     /* now handle ".." invalidation */
 391     if (!oneDir) {
 392         fileFid.Fid.Volume = aodp->f.fid.Fid.Volume;
 393         fileFid.Cell = aodp->f.fid.Cell;
 394         if (!fileFid.Fid.Unique)
 395             tvc = afs_LookupVCache(&fileFid, areq, NULL, andp, aname2);
 396         else
 397             tvc = afs_GetVCache(&fileFid, areq, NULL, (struct vcache *)0);
 398         if (tvc && (vType(tvc) == VDIR)) {
 399             ObtainWriteLock(&tvc->lock, 152);
 400             tdc1 = afs_FindDCache(tvc, (afs_size_t) 0);
 401             if (tdc1) {
 402                 if (AFS_IS_DISCON_RW) {
 403                     /* If disconnected, we need to fix (not discard) the "..".*/
 404                     afs_dir_ChangeFid(tdc1,
 405                         "..",
 406                         &aodp->f.fid.Fid.Vnode,
 407                         &andp->f.fid.Fid.Vnode);
 408                 } else {
 409                     ObtainWriteLock(&tdc1->lock, 648);
 410                     ZapDCE(tdc1);       /* mark as unknown */
 411                     DZap(tdc1);
 412                     ReleaseWriteLock(&tdc1->lock);
 413                     afs_PutDCache(tdc1);        /* put it back */
 414                 }
 415             }
 416             osi_dnlc_remove(tvc, "..", 0);
 417             ReleaseWriteLock(&tvc->lock);
 418             afs_PutVCache(tvc);
 419         } else if (AFS_IS_DISCON_RW && tvc && (vType(tvc) == VREG)) {
 420             /* XXX - Should tvc not get locked here? */
 421             tvc->f.parent.vnode = andp->f.fid.Fid.Vnode;
 422             tvc->f.parent.unique = andp->f.fid.Fid.Unique;
 423         } else if (tvc) {
 424             /* True we shouldn't come here since tvc SHOULD be a dir, but we
 425              * 'syntactically' need to unless  we change the 'if' above...
 426              */
 427             afs_PutVCache(tvc);
 428         }
 429     }
 430     code = returnCode;
 431   done:
 432     osi_FreeSmallSpace(OutOldDirStatus);
 433     osi_FreeSmallSpace(OutNewDirStatus);
 434     return code;
 435 }
 436
 437 int
 438 #if defined(AFS_SGI_ENV)
 439 afs_rename(OSI_VC_DECL(aodp), char *aname1, struct vcache *andp, char *aname2, struct pathname *npnp, afs_ucred_t *acred)
 440 #else
 441 afs_rename(OSI_VC_DECL(aodp), char *aname1, struct vcache *andp, char *aname2, afs_ucred_t *acred)
 442 #endif
 443 {
 444     afs_int32 code;
 445     struct afs_fakestat_state ofakestate;
 446     struct afs_fakestat_state nfakestate;
 447     struct vrequest *treq = NULL;
 448     OSI_VC_CONVERT(aodp);
 449
 450     code = afs_CreateReq(&treq, acred);
 451     if (code)
 452         return code;
 453
 454     afs_InitFakeStat(&ofakestate);
 455     afs_InitFakeStat(&nfakestate);
 456
 457     AFS_DISCON_LOCK();
 458
 459     code = afs_EvalFakeStat(&aodp, &ofakestate, treq);
 460     if (code)
 461         goto done;
 462     code = afs_EvalFakeStat(&andp, &nfakestate, treq);
 463     if (code)
 464         goto done;
 465     code = afsrename(aodp, aname1, andp, aname2, acred, treq);
 466   done:
 467     afs_PutFakeStat(&ofakestate);
 468     afs_PutFakeStat(&nfakestate);
 469
 470     AFS_DISCON_UNLOCK();
 471
 472     code = afs_CheckCode(code, treq, 25);
 473     afs_DestroyReq(treq);
 474     return code;
 475 }