/* don't set CDirty in here because RPC is called synchronously */ int afs_symlink(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, char *atargetName, struct vcache **tvcp, afs_ucred_t *acred) { afs_uint32 now = 0; struct vrequest *treq = NULL; afs_int32 code = 0; struct afs_conn *tc; struct VenusFid newFid; struct dcache *tdc; afs_size_t offset, len; afs_int32 alen; struct server *hostp = 0; struct vcache *tvc; struct AFSStoreStatus InStatus; struct AFSFetchStatus *OutFidStatus, *OutDirStatus; struct AFSCallBack CallBack; struct AFSVolSync tsync; struct volume *volp = 0; struct afs_fakestat_state fakestate; struct rx_connection *rxconn; XSTATS_DECLS; OSI_VC_CONVERT(adp); AFS_STATCNT(afs_symlink); afs_Trace2(afs_iclSetp, CM_TRACE_SYMLINK, ICL_TYPE_POINTER, adp, ICL_TYPE_STRING, aname); OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus)); OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus)); memset(&InStatus, 0, sizeof(InStatus)); if ((code = afs_CreateReq(&treq, acred))) goto done2; afs_InitFakeStat(&fakestate); AFS_DISCON_LOCK(); code = afs_EvalFakeStat(&adp, &fakestate, treq); if (code) goto done; if (strlen(aname) > AFSNAMEMAX || strlen(atargetName) > AFSPATHMAX) { code = ENAMETOOLONG; goto done; } if (afs_IsDynroot(adp)) { code = afs_DynrootVOPSymlink(adp, acred, aname, atargetName); goto done; } if (afs_IsDynrootMount(adp)) { code = EROFS; goto done; } code = afs_VerifyVCache(adp, treq); if (code) { code = afs_CheckCode(code, treq, 30); goto done; } /** If the volume is read-only, return error without making an RPC to the * fileserver */ if (adp->f.states & CRO) { code = EROFS; goto done; } if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) { code = ENETDOWN; goto done; } InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE; InStatus.ClientModTime = osi_Time(); alen = strlen(atargetName); /* we want it to include the null */ if ( (*atargetName == '#' || *atargetName == '%') && alen > 1 && atargetName[alen-1] == '.') { InStatus.UnixModeBits = 0644; /* mt pt: null from "." at end */ if (alen == 1) alen++; /* Empty string */ } else { InStatus.UnixModeBits = 0755; alen++; /* add in the null */ } tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1); volp = afs_FindVolume(&adp->f.fid, READ_LOCK); /*parent is also in same vol */ ObtainWriteLock(&adp->lock, 156); if (tdc) ObtainWriteLock(&tdc->lock, 636); /* No further locks: if the SymLink succeeds, it does not matter what happens * to our local copy of the directory. If somebody tampers with it in the meantime, * the copy will be invalidated */ if (!AFS_IS_DISCON_RW) { do { tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn); if (tc) { hostp = tc->parent->srvr->server; XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_SYMLINK); if (adp->f.states & CForeign) { now = osi_Time(); RX_AFS_GUNLOCK(); code = RXAFS_DFSSymlink(rxconn, (struct AFSFid *)&adp->f.fid.Fid, aname, atargetName, &InStatus, (struct AFSFid *)&newFid.Fid, OutFidStatus, OutDirStatus, &CallBack, &tsync); RX_AFS_GLOCK(); } else { RX_AFS_GUNLOCK(); code = RXAFS_Symlink(rxconn, (struct AFSFid *)&adp->f.fid.Fid, aname, atargetName, &InStatus, (struct AFSFid *)&newFid.Fid, OutFidStatus, OutDirStatus, &tsync); RX_AFS_GLOCK(); } XSTATS_END_TIME; } else code = -1; } while (afs_Analyze (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_SYMLINK, SHARED_LOCK, NULL)); } else { newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; afs_GenFakeFid(&newFid, VREG, 0); } ObtainWriteLock(&afs_xvcache, 40); if (code) { if (code < 0) { afs_StaleVCache(adp); } ReleaseWriteLock(&adp->lock); ReleaseWriteLock(&afs_xvcache); if (tdc) { ReleaseWriteLock(&tdc->lock); afs_PutDCache(tdc); } goto done; } /* otherwise, we should see if we can make the change to the dir locally */ if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) { /* we can do it locally */ ObtainWriteLock(&afs_xdcache, 293); /* If the following fails because the name has been created in the meantime, the * directory is out-of-date - the file server knows best! */ code = afs_dir_Create(tdc, aname, &newFid.Fid); ReleaseWriteLock(&afs_xdcache); if (code && !AFS_IS_DISCON_RW) { ZapDCE(tdc); /* surprise error -- use invalid value */ DZap(tdc); } } if (tdc) { ReleaseWriteLock(&tdc->lock); afs_PutDCache(tdc); } newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; ReleaseWriteLock(&adp->lock); /* now we're done with parent dir, create the link's entry. Note that * no one can get a pointer to the new cache entry until we release * the xvcache lock. */ tvc = afs_NewVCache(&newFid, hostp); if (!tvc) { code = -2; ReleaseWriteLock(&afs_xvcache); goto done; } ObtainWriteLock(&tvc->lock, 157); ObtainWriteLock(&afs_xcbhash, 500); tvc->f.states |= CStatd; /* have valid info */ tvc->f.states &= ~CBulkFetching; if (adp->f.states & CForeign) { tvc->f.states |= CForeign; /* We don't have to worry about losing the callback since we're doing it * under the afs_xvcache lock actually, afs_NewVCache may drop the * afs_xvcache lock, if it calls afs_FlushVCache */ tvc->cbExpires = CallBack.ExpirationTime + now; afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp); } else { tvc->cbExpires = 0x7fffffff; /* never expires, they can't change */ /* since it never expires, we don't have to queue the callback */ } ReleaseWriteLock(&afs_xcbhash); if (AFS_IS_DISCON_RW) { attrs->va_mode = InStatus.UnixModeBits; afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VLNK); code = afs_DisconCreateSymlink(tvc, atargetName, treq); if (code) { /* XXX - When this goes wrong, we need to tidy up the changes we made to * the parent, and get rid of the vcache we just created */ ReleaseWriteLock(&tvc->lock); ReleaseWriteLock(&afs_xvcache); afs_PutVCache(tvc); goto done; } afs_DisconAddDirty(tvc, VDisconCreate, 0); } else { afs_ProcessFS(tvc, OutFidStatus, treq); } if (!tvc->linkData) { tvc->linkData = afs_osi_Alloc(alen); osi_Assert(tvc->linkData != NULL); strncpy(tvc->linkData, atargetName, alen - 1); tvc->linkData[alen - 1] = 0; } ReleaseWriteLock(&tvc->lock); ReleaseWriteLock(&afs_xvcache); if (tvcp) *tvcp = tvc; else afs_PutVCache(tvc); code = 0; done: afs_PutFakeStat(&fakestate); if (volp) afs_PutVolume(volp, READ_LOCK); AFS_DISCON_UNLOCK(); code = afs_CheckCode(code, treq, 31); afs_DestroyReq(treq); done2: osi_FreeSmallSpace(OutFidStatus); osi_FreeSmallSpace(OutDirStatus); return code; }
/* question: does afs_create need to set CDirty in the adp or the avc? * I think we can get away without it, but I'm not sure. Note that * afs_setattr is called in here for truncation. */ #ifdef AFS_SGI64_ENV int afs_create(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, int flags, int amode, struct vcache **avcp, afs_ucred_t *acred) #else /* AFS_SGI64_ENV */ int afs_create(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, enum vcexcl aexcl, int amode, struct vcache **avcp, afs_ucred_t *acred) #endif /* AFS_SGI64_ENV */ { afs_int32 origCBs, origZaps, finalZaps; struct vrequest *treq = NULL; afs_int32 code; struct afs_conn *tc; struct VenusFid newFid; struct AFSStoreStatus InStatus; struct AFSFetchStatus *OutFidStatus, *OutDirStatus; struct AFSVolSync tsync; struct AFSCallBack CallBack; afs_int32 now; struct dcache *tdc; afs_size_t offset, len; struct server *hostp = 0; struct vcache *tvc; struct volume *volp = 0; struct afs_fakestat_state fakestate; struct rx_connection *rxconn; XSTATS_DECLS; OSI_VC_CONVERT(adp); AFS_STATCNT(afs_create); OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus)); OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus)); memset(&InStatus, 0, sizeof(InStatus)); if ((code = afs_CreateReq(&treq, acred))) goto done2; afs_Trace3(afs_iclSetp, CM_TRACE_CREATE, ICL_TYPE_POINTER, adp, ICL_TYPE_STRING, aname, ICL_TYPE_INT32, amode); afs_InitFakeStat(&fakestate); #ifdef AFS_SGI65_ENV /* If avcp is passed not null, it's the old reference to this file. * We can use this to avoid create races. For now, just decrement * the reference count on it. */ if (*avcp) { AFS_RELE(AFSTOV(*avcp)); *avcp = NULL; } #endif if (strlen(aname) > AFSNAMEMAX) { code = ENAMETOOLONG; goto done3; } if (!afs_ENameOK(aname)) { code = EINVAL; goto done3; } switch (attrs->va_type) { case VBLK: case VCHR: #if !defined(AFS_SUN5_ENV) case VSOCK: #endif case VFIFO: /* We don't support special devices or FIFOs */ code = EINVAL; goto done3; default: ; } AFS_DISCON_LOCK(); code = afs_EvalFakeStat(&adp, &fakestate, treq); if (code) goto done; tagain: code = afs_VerifyVCache(adp, treq); if (code) goto done; /** If the volume is read-only, return error without making an RPC to the * fileserver */ if (adp->f.states & CRO) { code = EROFS; goto done; } if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) { code = ENETDOWN; goto done; } tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1); ObtainWriteLock(&adp->lock, 135); if (tdc) ObtainSharedLock(&tdc->lock, 630); /* * Make sure that the data in the cache is current. We may have * received a callback while we were waiting for the write lock. */ if (!(adp->f.states & CStatd) || (tdc && !hsame(adp->f.m.DataVersion, tdc->f.versionNo))) { ReleaseWriteLock(&adp->lock); if (tdc) { ReleaseSharedLock(&tdc->lock); afs_PutDCache(tdc); } goto tagain; } if (tdc) { /* see if file already exists. If it does, we only set * the size attributes (to handle O_TRUNC) */ code = afs_dir_Lookup(tdc, aname, &newFid.Fid); /* use dnlc first xxx */ if (code == 0) { ReleaseSharedLock(&tdc->lock); afs_PutDCache(tdc); ReleaseWriteLock(&adp->lock); #ifdef AFS_SGI64_ENV if (flags & VEXCL) { #else if (aexcl != NONEXCL) { #endif code = EEXIST; /* file exists in excl mode open */ goto done; } /* found the file, so use it */ newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; tvc = NULL; if (newFid.Fid.Unique == 0) { tvc = afs_LookupVCache(&newFid, treq, NULL, adp, aname); } if (!tvc) /* lookup failed or wasn't called */ tvc = afs_GetVCache(&newFid, treq, NULL, NULL); if (tvc) { /* if the thing exists, we need the right access to open it. * we must check that here, since no other checks are * made by the open system call */ len = attrs->va_size; /* only do the truncate */ /* * We used to check always for READ access before; the * problem is that we will fail if the existing file * has mode -w-w-w, which is wrong. */ if ((amode & VREAD) && !afs_AccessOK(tvc, PRSFS_READ, treq, CHECK_MODE_BITS)) { afs_PutVCache(tvc); code = EACCES; goto done; } #if defined(AFS_DARWIN80_ENV) if ((amode & VWRITE) || VATTR_IS_ACTIVE(attrs, va_data_size)) #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) if ((amode & VWRITE) || (attrs->va_mask & AT_SIZE)) #else if ((amode & VWRITE) || len != 0xffffffff) #endif { /* needed for write access check */ tvc->f.parent.vnode = adp->f.fid.Fid.Vnode; tvc->f.parent.unique = adp->f.fid.Fid.Unique; /* need write mode for these guys */ if (!afs_AccessOK (tvc, PRSFS_WRITE, treq, CHECK_MODE_BITS)) { afs_PutVCache(tvc); code = EACCES; goto done; } } #if defined(AFS_DARWIN80_ENV) if (VATTR_IS_ACTIVE(attrs, va_data_size)) #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) if (attrs->va_mask & AT_SIZE) #else if (len != 0xffffffff) #endif { if (vType(tvc) != VREG) { afs_PutVCache(tvc); code = EISDIR; goto done; } /* do a truncate */ #if defined(AFS_DARWIN80_ENV) VATTR_INIT(attrs); VATTR_SET_SUPPORTED(attrs, va_data_size); VATTR_SET_ACTIVE(attrs, va_data_size); #elif defined(UKERNEL) attrs->va_mask = ATTR_SIZE; #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) attrs->va_mask = AT_SIZE; #else VATTR_NULL(attrs); #endif attrs->va_size = len; ObtainWriteLock(&tvc->lock, 136); tvc->f.states |= CCreating; ReleaseWriteLock(&tvc->lock); #if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) #if defined(AFS_SGI64_ENV) code = afs_setattr(VNODE_TO_FIRST_BHV((vnode_t *) tvc), attrs, 0, acred); #else code = afs_setattr(tvc, attrs, 0, acred); #endif /* AFS_SGI64_ENV */ #else /* SUN5 || SGI */ code = afs_setattr(tvc, attrs, acred); #endif /* SUN5 || SGI */ ObtainWriteLock(&tvc->lock, 137); tvc->f.states &= ~CCreating; ReleaseWriteLock(&tvc->lock); if (code) { afs_PutVCache(tvc); goto done; } } *avcp = tvc; } else code = ENOENT; /* shouldn't get here */ /* make sure vrefCount bumped only if code == 0 */ goto done; } } /* if we create the file, we don't do any access checks, since * that's how O_CREAT is supposed to work */ if (adp->f.states & CForeign) { origCBs = afs_allCBs; origZaps = afs_allZaps; } else { origCBs = afs_evenCBs; /* if changes, we don't really have a callback */ origZaps = afs_evenZaps; /* number of even numbered vnodes discarded */ } InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE | AFS_SETGROUP; InStatus.ClientModTime = osi_Time(); InStatus.Group = (afs_int32) afs_cr_gid(acred); if (AFS_NFSXLATORREQ(acred)) { /* * XXX The following is mainly used to fix a bug in the HP-UX * nfs client where they create files with mode of 0 without * doing any setattr later on to fix it. * XXX */ #if defined(AFS_AIX_ENV) if (attrs->va_mode != -1) { #else #if defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) if (attrs->va_mask & AT_MODE) { #else if (attrs->va_mode != ((unsigned short)-1)) { #endif #endif if (!attrs->va_mode) attrs->va_mode = 0x1b6; /* XXX default mode: rw-rw-rw XXX */ } } if (!AFS_IS_DISCONNECTED) { /* If not disconnected, connect to the server.*/ InStatus.UnixModeBits = attrs->va_mode & 0xffff; /* only care about protection bits */ do { tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn); if (tc) { hostp = tc->srvr->server; /* remember for callback processing */ now = osi_Time(); XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_CREATEFILE); RX_AFS_GUNLOCK(); code = RXAFS_CreateFile(rxconn, (struct AFSFid *)&adp->f.fid.Fid, aname, &InStatus, (struct AFSFid *) &newFid.Fid, OutFidStatus, OutDirStatus, &CallBack, &tsync); RX_AFS_GLOCK(); XSTATS_END_TIME; CallBack.ExpirationTime += now; } else code = -1; } while (afs_Analyze (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_CREATEFILE, SHARED_LOCK, NULL)); if ((code == EEXIST || code == UAEEXIST) && #ifdef AFS_SGI64_ENV !(flags & VEXCL) #else /* AFS_SGI64_ENV */ aexcl == NONEXCL #endif ) { /* if we get an EEXIST in nonexcl mode, just do a lookup */ if (tdc) { ReleaseSharedLock(&tdc->lock); afs_PutDCache(tdc); } ReleaseWriteLock(&adp->lock); #if defined(AFS_SGI64_ENV) code = afs_lookup(VNODE_TO_FIRST_BHV((vnode_t *) adp), aname, avcp, NULL, 0, NULL, acred); #elif defined(AFS_SUN5_ENV) || defined(AFS_SGI_ENV) code = afs_lookup(adp, aname, avcp, NULL, 0, NULL, acred); #elif defined(UKERNEL) code = afs_lookup(adp, aname, avcp, acred, 0); #elif !defined(AFS_DARWIN_ENV) code = afs_lookup(adp, aname, avcp, acred); #endif goto done; } if (code) { if (code < 0) { ObtainWriteLock(&afs_xcbhash, 488); afs_DequeueCallback(adp); adp->f.states &= ~CStatd; ReleaseWriteLock(&afs_xcbhash); osi_dnlc_purgedp(adp); } ReleaseWriteLock(&adp->lock); if (tdc) { ReleaseSharedLock(&tdc->lock); afs_PutDCache(tdc); } goto done; } } else { /* Generate a fake FID for disconnected mode. */ newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; afs_GenFakeFid(&newFid, VREG, 1); } /* if (!AFS_IS_DISCON_RW) */ /* otherwise, we should see if we can make the change to the dir locally */ if (tdc) UpgradeSToWLock(&tdc->lock, 631); if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) { /* we can do it locally */ ObtainWriteLock(&afs_xdcache, 291); code = afs_dir_Create(tdc, aname, &newFid.Fid); ReleaseWriteLock(&afs_xdcache); if (code) { ZapDCE(tdc); DZap(tdc); } } if (tdc) { ReleaseWriteLock(&tdc->lock); afs_PutDCache(tdc); } if (AFS_IS_DISCON_RW) adp->f.m.LinkCount++; newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; ReleaseWriteLock(&adp->lock); volp = afs_FindVolume(&newFid, READ_LOCK); /* New tricky optimistic callback handling algorithm for file creation works * as follows. We create the file essentially with no locks set at all. File * server may thus handle operations from others cache managers as well as from * this very own cache manager that reference the file in question before * we managed to create the cache entry. However, if anyone else changes * any of the status information for a file, we'll see afs_evenCBs increase * (files always have even fids). If someone on this workstation manages * to do something to the file, they'll end up having to create a cache * entry for the new file. Either we'll find it once we've got the afs_xvcache * lock set, or it was also *deleted* the vnode before we got there, in which case * we will find evenZaps has changed, too. Thus, we only assume we have the right * status information if no callbacks or vnode removals have occurred to even * numbered files from the time the call started until the time that we got the xvcache * lock set. Of course, this also assumes that any call that modifies a file first * gets a write lock on the file's vnode, but if that weren't true, the whole cache manager * would fail, since no call would be able to update the local vnode status after modifying * a file on a file server. */ ObtainWriteLock(&afs_xvcache, 138); if (adp->f.states & CForeign) finalZaps = afs_allZaps; /* do this before calling newvcache */ else finalZaps = afs_evenZaps; /* do this before calling newvcache */ /* don't need to call RemoveVCB, since only path leaving a callback is the * one where we pass through afs_NewVCache. Can't have queued a VCB unless * we created and freed an entry between file creation time and here, and the * freeing of the vnode will change evenZaps. Don't need to update the VLRU * queue, since the find will only succeed in the event of a create race, and * then the vcache will be at the front of the VLRU queue anyway... */ if (!(tvc = afs_FindVCache(&newFid, 0, DO_STATS))) { tvc = afs_NewVCache(&newFid, hostp); if (tvc) { int finalCBs; ObtainWriteLock(&tvc->lock, 139); ObtainWriteLock(&afs_xcbhash, 489); finalCBs = afs_evenCBs; /* add the callback in */ if (adp->f.states & CForeign) { tvc->f.states |= CForeign; finalCBs = afs_allCBs; } if (origCBs == finalCBs && origZaps == finalZaps) { tvc->f.states |= CStatd; /* we've fake entire thing, so don't stat */ tvc->f.states &= ~CBulkFetching; if (!AFS_IS_DISCON_RW) { tvc->cbExpires = CallBack.ExpirationTime; afs_QueueCallback(tvc, CBHash(CallBack.ExpirationTime), volp); } } else { afs_DequeueCallback(tvc); tvc->f.states &= ~(CStatd | CUnique); tvc->callback = 0; if (tvc->f.fid.Fid.Vnode & 1 || (vType(tvc) == VDIR)) osi_dnlc_purgedp(tvc); } ReleaseWriteLock(&afs_xcbhash); if (AFS_IS_DISCON_RW) { afs_DisconAddDirty(tvc, VDisconCreate, 0); afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VREG); } else { afs_ProcessFS(tvc, OutFidStatus, treq); } tvc->f.parent.vnode = adp->f.fid.Fid.Vnode; tvc->f.parent.unique = adp->f.fid.Fid.Unique; #if !defined(UKERNEL) if (volp && (volp->states & VPartVisible)) tvc->f.states |= CPartVisible; #endif ReleaseWriteLock(&tvc->lock); *avcp = tvc; code = 0; } else code = ENOENT; } else { /* otherwise cache entry already exists, someone else must * have created it. Comments used to say: "don't need write * lock to *clear* these flags" but we should do it anyway. * Code used to clear stat bit and callback, but I don't see * the point -- we didn't have a create race, somebody else just * snuck into NewVCache before we got here, probably a racing * lookup. */ *avcp = tvc; code = 0; } ReleaseWriteLock(&afs_xvcache); done: AFS_DISCON_UNLOCK(); done3: if (volp) afs_PutVolume(volp, READ_LOCK); if (code == 0) { if (afs_mariner) afs_AddMarinerName(aname, *avcp); /* return the new status in vattr */ afs_CopyOutAttrs(*avcp, attrs); if (afs_mariner) afs_MarinerLog("store$Creating", *avcp); } afs_PutFakeStat(&fakestate); code = afs_CheckCode(code, treq, 20); afs_DestroyReq(treq); done2: osi_FreeSmallSpace(OutFidStatus); osi_FreeSmallSpace(OutDirStatus); return code; } /* * Check to see if we can track the change locally: requires that * we have sufficiently recent info in data cache. If so, we * know the new DataVersion number, and place it correctly in both the * data and stat cache entries. This routine returns 1 if we should * do the operation locally, and 0 otherwise. * * This routine must be called with the stat cache entry write-locked, * and dcache entry write-locked. */ int afs_LocalHero(struct vcache *avc, struct dcache *adc, AFSFetchStatus * astat, int aincr) { afs_int32 ok; afs_hyper_t avers; AFS_STATCNT(afs_LocalHero); hset64(avers, astat->dataVersionHigh, astat->DataVersion); /* avers *is* the version number now, no matter what */ if (adc) { /* does what's in the dcache *now* match what's in the vcache *now*, * and do we have a valid callback? if not, our local copy is not "ok" */ ok = (hsame(avc->f.m.DataVersion, adc->f.versionNo) && avc->callback && (avc->f.states & CStatd) && avc->cbExpires >= osi_Time()); } else { ok = 0; } if (ok) { /* check that the DV on the server is what we expect it to be */ afs_hyper_t newDV; hset(newDV, adc->f.versionNo); hadd32(newDV, aincr); if (!hsame(avers, newDV)) { ok = 0; } } #if defined(AFS_SGI_ENV) osi_Assert(avc->v.v_type == VDIR); #endif /* The bulk status code used the length as a sequence number. */ /* Don't update the vcache entry unless the stats are current. */ if (avc->f.states & CStatd) { hset(avc->f.m.DataVersion, avers); #ifdef AFS_64BIT_CLIENT FillInt64(avc->f.m.Length, astat->Length_hi, astat->Length); #else /* AFS_64BIT_CLIENT */ avc->f.m.Length = astat->Length; #endif /* AFS_64BIT_CLIENT */ avc->f.m.Date = astat->ClientModTime; } if (ok) { /* we've been tracking things correctly */ adc->dflags |= DFEntryMod; adc->f.versionNo = avers; return 1; } else { if (adc) { ZapDCE(adc); DZap(adc); } if (avc->f.states & CStatd) { osi_dnlc_purgedp(avc); } return 0; } }
int afs_mkdir(OSI_VC_DECL(adp), char *aname, struct vattr *attrs, struct vcache **avcp, afs_ucred_t *acred) { struct vrequest *treq = NULL; afs_int32 code; struct afs_conn *tc; struct rx_connection *rxconn; struct VenusFid newFid; struct dcache *tdc; struct dcache *new_dc; afs_size_t offset, len; struct vcache *tvc; struct AFSStoreStatus InStatus; struct AFSFetchStatus *OutFidStatus, *OutDirStatus; struct AFSCallBack CallBack; struct AFSVolSync tsync; afs_int32 now; struct afs_fakestat_state fakestate; XSTATS_DECLS; OSI_VC_CONVERT(adp); AFS_STATCNT(afs_mkdir); afs_Trace2(afs_iclSetp, CM_TRACE_MKDIR, ICL_TYPE_POINTER, adp, ICL_TYPE_STRING, aname); OutFidStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus)); OutDirStatus = osi_AllocSmallSpace(sizeof(struct AFSFetchStatus)); memset(&InStatus, 0, sizeof(InStatus)); if ((code = afs_CreateReq(&treq, acred))) goto done2; afs_InitFakeStat(&fakestate); if (strlen(aname) > AFSNAMEMAX) { code = ENAMETOOLONG; goto done3; } if (!afs_ENameOK(aname)) { code = EINVAL; goto done3; } AFS_DISCON_LOCK(); code = afs_EvalFakeStat(&adp, &fakestate, treq); if (code) goto done; code = afs_VerifyVCache(adp, treq); if (code) goto done; /** If the volume is read-only, return error without making an RPC to the * fileserver */ if (adp->f.states & CRO) { code = EROFS; goto done; } if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) { /*printf("Network is down in afs_mkdir\n");*/ code = ENETDOWN; goto done; } InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE | AFS_SETGROUP; InStatus.ClientModTime = osi_Time(); InStatus.UnixModeBits = attrs->va_mode & 0xffff; /* only care about protection bits */ InStatus.Group = (afs_int32) afs_cr_gid(acred); tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1); ObtainWriteLock(&adp->lock, 153); if (!AFS_IS_DISCON_RW) { do { tc = afs_Conn(&adp->f.fid, treq, SHARED_LOCK, &rxconn); if (tc) { XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_MAKEDIR); now = osi_Time(); RX_AFS_GUNLOCK(); code = RXAFS_MakeDir(rxconn, (struct AFSFid *)&adp->f.fid.Fid, aname, &InStatus, (struct AFSFid *)&newFid.Fid, OutFidStatus, OutDirStatus, &CallBack, &tsync); RX_AFS_GLOCK(); XSTATS_END_TIME; CallBack.ExpirationTime += now; /* DON'T forget to Set the callback value... */ } else code = -1; } while (afs_Analyze (tc, rxconn, code, &adp->f.fid, treq, AFS_STATS_FS_RPCIDX_MAKEDIR, SHARED_LOCK, NULL)); if (code) { if (code < 0) { afs_StaleVCache(adp); } ReleaseWriteLock(&adp->lock); if (tdc) afs_PutDCache(tdc); goto done; } } else { /* Disconnected. */ /* We have the dir entry now, we can use it while disconnected. */ if (adp->mvid.target_root == NULL) { /* If not mount point, generate a new fid. */ newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; afs_GenFakeFid(&newFid, VDIR, 1); } /* XXX: If mount point???*/ /* Operations with the actual dir's cache entry are further * down, where the dir entry gets created. */ } /* if (!AFS_IS_DISCON_RW) */ /* otherwise, we should see if we can make the change to the dir locally */ if (tdc) ObtainWriteLock(&tdc->lock, 632); if (AFS_IS_DISCON_RW || afs_LocalHero(adp, tdc, OutDirStatus, 1)) { /* we can do it locally */ ObtainWriteLock(&afs_xdcache, 294); code = afs_dir_Create(tdc, aname, &newFid.Fid); ReleaseWriteLock(&afs_xdcache); if (code) { ZapDCE(tdc); /* surprise error -- use invalid value */ DZap(tdc); } } if (tdc) { ReleaseWriteLock(&tdc->lock); afs_PutDCache(tdc); } if (AFS_IS_DISCON_RW) /* We will have to settle with the local link count. */ adp->f.m.LinkCount++; else adp->f.m.LinkCount = OutDirStatus->LinkCount; newFid.Cell = adp->f.fid.Cell; newFid.Fid.Volume = adp->f.fid.Fid.Volume; ReleaseWriteLock(&adp->lock); if (AFS_IS_DISCON_RW) { /* When disconnected, we have to create the full dir here. */ /* Generate a new vcache and fill it. */ tvc = afs_NewVCache(&newFid, NULL); if (tvc) { *avcp = tvc; } else { code = EIO; goto done; } ObtainWriteLock(&tvc->lock, 738); afs_GenDisconStatus(adp, tvc, &newFid, attrs, treq, VDIR); ReleaseWriteLock(&tvc->lock); /* And now make an empty dir, containing . and .. : */ /* Get a new dcache for it first. */ new_dc = afs_GetDCache(tvc, (afs_size_t) 0, treq, &offset, &len, 1); if (!new_dc) { /* printf("afs_mkdir: can't get new dcache for dir.\n"); */ code = EIO; goto done; } ObtainWriteLock(&afs_xdcache, 739); code = afs_dir_MakeDir(new_dc, (afs_int32 *) &newFid.Fid, (afs_int32 *) &adp->f.fid.Fid); ReleaseWriteLock(&afs_xdcache); /* if (code) printf("afs_mkdir: afs_dirMakeDir code = %u\n", code); */ afs_PutDCache(new_dc); ObtainWriteLock(&tvc->lock, 731); /* Update length in the vcache. */ tvc->f.m.Length = new_dc->f.chunkBytes; afs_DisconAddDirty(tvc, VDisconCreate, 1); ReleaseWriteLock(&tvc->lock); } else { /* now we're done with parent dir, create the real dir's cache entry */ tvc = afs_GetVCache(&newFid, treq, NULL, NULL); if (tvc) { code = 0; *avcp = tvc; } else { /* For some reason, we cannot fetch the vcache for our * newly-created dir. */ code = EIO; } } /* if (AFS_DISCON_RW) */ done: AFS_DISCON_UNLOCK(); done3: afs_PutFakeStat(&fakestate); code = afs_CheckCode(code, treq, 26); afs_DestroyReq(treq); done2: osi_FreeSmallSpace(OutFidStatus); osi_FreeSmallSpace(OutDirStatus); return code; }