/*!
* Changes a file's parent fid references.
*/
static int
fix_children_fids_hook(void *hdata, char *aname, afs_int32 vnode,
afs_int32 unique)
{
struct VenusFid tfid;
struct VenusFid *afid = (struct VenusFid *) hdata;
struct vcache *tvc;
struct dcache *tdc = NULL;
if ((aname[0] == '.') && !aname[1])
return 0;
if ((aname[0] == '.') && (aname[1] == '.') && !aname[2])
return 0;
tfid.Cell = afid->Cell;
tfid.Fid.Volume = afid->Fid.Volume;
tfid.Fid.Vnode = vnode;
tfid.Fid.Unique = unique;
if (!(vnode % 2)) {
/* vnode's parity indicates that it's a file. */
/* Get the vcache. */
ObtainSharedLock(&afs_xvcache, 759);
tvc = afs_FindVCache(&tfid, 0, 1);
ReleaseSharedLock(&afs_xvcache);
/* Change the fields. */
if (tvc) {
tvc->f.parent.vnode = afid->Fid.Vnode;
tvc->f.parent.unique = afid->Fid.Unique;
afs_PutVCache(tvc);
}
} else {
/* It's a dir. Fix this dir's .. entry to contain the new fid. */
/* Seek the dir's dcache. */
tdc = afs_FindDCacheByFid(&tfid);
if (tdc) {
/* Change the .. entry fid. */
afs_dir_ChangeFid(tdc, "..", NULL, &afid->Fid.Vnode);
afs_PutDCache(tdc);
}
} /* if (!(vnode % 2))*/
return 0;
}
int
afsrename(struct vcache *aodp, char *aname1, struct vcache *andp,
char *aname2, struct AFS_UCRED *acred, struct vrequest *areq)
{
register struct afs_conn *tc;
register afs_int32 code = 0;
afs_int32 returnCode;
int oneDir, doLocally;
afs_size_t offset, len;
struct VenusFid unlinkFid, fileFid;
struct vcache *tvc;
struct dcache *tdc1, *tdc2;
struct AFSFetchStatus OutOldDirStatus, OutNewDirStatus;
struct AFSVolSync tsync;
XSTATS_DECLS;
AFS_STATCNT(afs_rename);
afs_Trace4(afs_iclSetp, CM_TRACE_RENAME, ICL_TYPE_POINTER, aodp,
ICL_TYPE_STRING, aname1, ICL_TYPE_POINTER, andp,
ICL_TYPE_STRING, aname2);
if (strlen(aname1) > AFSNAMEMAX || strlen(aname2) > AFSNAMEMAX) {
code = ENAMETOOLONG;
goto done;
}
/* verify the latest versions of the stat cache entries */
tagain:
code = afs_VerifyVCache(aodp, areq);
if (code)
goto done;
code = afs_VerifyVCache(andp, areq);
if (code)
goto done;
/* lock in appropriate order, after some checks */
if (aodp->f.fid.Cell != andp->f.fid.Cell
|| aodp->f.fid.Fid.Volume != andp->f.fid.Fid.Volume) {
code = EXDEV;
goto done;
}
oneDir = 0;
code = 0;
if (andp->f.fid.Fid.Vnode == aodp->f.fid.Fid.Vnode) {
if (!strcmp(aname1, aname2)) {
/* Same directory and same name; this is a noop and just return success
* to save cycles and follow posix standards */
code = 0;
goto done;
}
if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
code = ENETDOWN;
goto done;
}
ObtainWriteLock(&andp->lock, 147);
tdc1 = afs_GetDCache(aodp, (afs_size_t) 0, areq, &offset, &len, 0);
if (!tdc1) {
code = ENOENT;
} else {
ObtainWriteLock(&tdc1->lock, 643);
}
tdc2 = tdc1;
oneDir = 1; /* only one dude locked */
} else if ((andp->f.states & CRO) || (aodp->f.states & CRO)) {
code = EROFS;
goto done;
} else if (andp->f.fid.Fid.Vnode < aodp->f.fid.Fid.Vnode) {
ObtainWriteLock(&andp->lock, 148); /* lock smaller one first */
ObtainWriteLock(&aodp->lock, 149);
tdc2 = afs_FindDCache(andp, (afs_size_t) 0);
if (tdc2)
ObtainWriteLock(&tdc2->lock, 644);
tdc1 = afs_GetDCache(aodp, (afs_size_t) 0, areq, &offset, &len, 0);
if (tdc1)
ObtainWriteLock(&tdc1->lock, 645);
else
code = ENOENT;
} else {
ObtainWriteLock(&aodp->lock, 150); /* lock smaller one first */
ObtainWriteLock(&andp->lock, 557);
tdc1 = afs_GetDCache(aodp, (afs_size_t) 0, areq, &offset, &len, 0);
if (tdc1)
ObtainWriteLock(&tdc1->lock, 646);
else
code = ENOENT;
tdc2 = afs_FindDCache(andp, (afs_size_t) 0);
if (tdc2)
ObtainWriteLock(&tdc2->lock, 647);
}
osi_dnlc_remove(aodp, aname1, 0);
osi_dnlc_remove(andp, aname2, 0);
/*
* 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 (tdc1) {
if (!(aodp->f.states & CStatd)
|| !hsame(aodp->f.m.DataVersion, tdc1->f.versionNo)) {
ReleaseWriteLock(&aodp->lock);
if (!oneDir) {
if (tdc2) {
ReleaseWriteLock(&tdc2->lock);
afs_PutDCache(tdc2);
}
ReleaseWriteLock(&andp->lock);
}
ReleaseWriteLock(&tdc1->lock);
afs_PutDCache(tdc1);
goto tagain;
}
}
if (code == 0)
code = afs_dir_Lookup(tdc1, aname1, &fileFid.Fid);
if (code) {
if (tdc1) {
ReleaseWriteLock(&tdc1->lock);
afs_PutDCache(tdc1);
}
ReleaseWriteLock(&aodp->lock);
if (!oneDir) {
if (tdc2) {
ReleaseWriteLock(&tdc2->lock);
afs_PutDCache(tdc2);
}
ReleaseWriteLock(&andp->lock);
}
goto done;
}
if (!AFS_IS_DISCON_RW) {
/* Connected. */
do {
tc = afs_Conn(&aodp->f.fid, areq, SHARED_LOCK);
if (tc) {
XSTATS_START_TIME(AFS_STATS_FS_RPCIDX_RENAME);
RX_AFS_GUNLOCK();
code =
RXAFS_Rename(tc->id,
(struct AFSFid *)&aodp->f.fid.Fid,
aname1,
(struct AFSFid *)&andp->f.fid.Fid,
aname2,
&OutOldDirStatus,
&OutNewDirStatus,
&tsync);
RX_AFS_GLOCK();
XSTATS_END_TIME;
} else
code = -1;
} while (afs_Analyze
(tc, code, &andp->f.fid, areq, AFS_STATS_FS_RPCIDX_RENAME,
SHARED_LOCK, NULL));
} else {
#if defined(AFS_DISCON_ENV)
/* Disconnected. */
/* Seek moved file vcache. */
fileFid.Cell = aodp->f.fid.Cell;
fileFid.Fid.Volume = aodp->f.fid.Fid.Volume;
ObtainSharedLock(&afs_xvcache, 754);
tvc = afs_FindVCache(&fileFid, 0 , 1);
ReleaseSharedLock(&afs_xvcache);
if (tvc) {
/* XXX - We're locking this vcache whilst holding dcaches. Ooops */
ObtainWriteLock(&tvc->lock, 750);
if (!(tvc->f.ddirty_flags & (VDisconRename|VDisconCreate))) {
/* If the vnode was created locally, then we don't care
* about recording the rename - we'll do it automatically
* on replay. If we've already renamed, we've already stored
* the required information about where we came from.
*/
if (!aodp->f.shadow.vnode) {
/* Make shadow copy of parent dir only. */
afs_MakeShadowDir(aodp, tdc1);
}
/* Save old parent dir fid so it will be searchable
* in the shadow dir.
*/
tvc->f.oldParent.vnode = aodp->f.fid.Fid.Vnode;
tvc->f.oldParent.unique = aodp->f.fid.Fid.Unique;
afs_DisconAddDirty(tvc,
VDisconRename
| (oneDir ? VDisconRenameSameDir:0),
1);
}
ReleaseWriteLock(&tvc->lock);
afs_PutVCache(tvc);
} else {
code = ENOENT;
} /* if (tvc) */
#endif
} /* if !(AFS_IS_DISCON_RW)*/
returnCode = code; /* remember for later */
/* Now we try to do things locally. This is really loathsome code. */
unlinkFid.Fid.Vnode = 0;
if (code == 0) {
/* In any event, we don't really care if the data (tdc2) is not
* in the cache; if it isn't, we won't do the update locally. */
/* see if version numbers increased properly */
doLocally = 1;
if (!AFS_IS_DISCON_RW) {
if (oneDir) {
/* number increases by 1 for whole rename operation */
if (!afs_LocalHero(aodp, tdc1, &OutOldDirStatus, 1)) {
doLocally = 0;
}
} else {
/* two separate dirs, each increasing by 1 */
if (!afs_LocalHero(aodp, tdc1, &OutOldDirStatus, 1))
doLocally = 0;
if (!afs_LocalHero(andp, tdc2, &OutNewDirStatus, 1))
doLocally = 0;
if (!doLocally) {
if (tdc1) {
ZapDCE(tdc1);
DZap(tdc1);
}
if (tdc2) {
ZapDCE(tdc2);
DZap(tdc2);
}
}
}
} /* if (!AFS_IS_DISCON_RW) */
/* now really do the work */
if (doLocally) {
/* first lookup the fid of the dude we're moving */
code = afs_dir_Lookup(tdc1, aname1, &fileFid.Fid);
if (code == 0) {
/* delete the source */
code = afs_dir_Delete(tdc1, aname1);
}
/* first see if target is there */
if (code == 0
&& afs_dir_Lookup(tdc2, aname2,
&unlinkFid.Fid) == 0) {
/* target already exists, and will be unlinked by server */
code = afs_dir_Delete(tdc2, aname2);
}
if (code == 0) {
ObtainWriteLock(&afs_xdcache, 292);
code = afs_dir_Create(tdc2, aname2, &fileFid.Fid);
ReleaseWriteLock(&afs_xdcache);
}
if (code != 0) {
ZapDCE(tdc1);
DZap(tdc1);
if (!oneDir) {
ZapDCE(tdc2);
DZap(tdc2);
}
}
}
/* update dir link counts */
if (AFS_IS_DISCON_RW) {
if (!oneDir) {
aodp->f.m.LinkCount--;
andp->f.m.LinkCount++;
}
/* If we're in the same directory, link count doesn't change */
} else {
aodp->f.m.LinkCount = OutOldDirStatus.LinkCount;
if (!oneDir)
andp->f.m.LinkCount = OutNewDirStatus.LinkCount;
}
} else { /* operation failed (code != 0) */
if (code < 0) {
/* if failed, server might have done something anyway, and
* assume that we know about it */
ObtainWriteLock(&afs_xcbhash, 498);
afs_DequeueCallback(aodp);
afs_DequeueCallback(andp);
andp->f.states &= ~CStatd;
aodp->f.states &= ~CStatd;
ReleaseWriteLock(&afs_xcbhash);
osi_dnlc_purgedp(andp);
osi_dnlc_purgedp(aodp);
}
}
/* release locks */
if (tdc1) {
ReleaseWriteLock(&tdc1->lock);
afs_PutDCache(tdc1);
}
if ((!oneDir) && tdc2) {
ReleaseWriteLock(&tdc2->lock);
afs_PutDCache(tdc2);
}
ReleaseWriteLock(&aodp->lock);
if (!oneDir) {
ReleaseWriteLock(&andp->lock);
}
if (returnCode) {
code = returnCode;
goto done;
}
/* now, some more details. if unlinkFid.Fid.Vnode then we should decrement
* the link count on this file. Note that if fileFid is a dir, then we don't
* have to invalidate its ".." entry, since its DataVersion # should have
* changed. However, interface is not good enough to tell us the
* *file*'s new DataVersion, so we're stuck. Our hack: delete mark
* the data as having an "unknown" version (effectively discarding the ".."
* entry */
if (unlinkFid.Fid.Vnode) {
unlinkFid.Fid.Volume = aodp->f.fid.Fid.Volume;
unlinkFid.Cell = aodp->f.fid.Cell;
tvc = NULL;
if (!unlinkFid.Fid.Unique) {
tvc = afs_LookupVCache(&unlinkFid, areq, NULL, aodp, aname1);
}
if (!tvc) /* lookup failed or wasn't called */
tvc = afs_GetVCache(&unlinkFid, areq, NULL, NULL);
if (tvc) {
#ifdef AFS_BOZONLOCK_ENV
afs_BozonLock(&tvc->pvnLock, tvc); /* Since afs_TryToSmush will do a pvn_vptrunc */
#endif
ObtainWriteLock(&tvc->lock, 151);
tvc->f.m.LinkCount--;
tvc->f.states &= ~CUnique; /* For the dfs xlator */
if (tvc->f.m.LinkCount == 0 && !osi_Active(tvc)) {
/* if this was last guy (probably) discard from cache.
* We have to be careful to not get rid of the stat
* information, since otherwise operations will start
* failing even if the file was still open (or
* otherwise active), and the server no longer has the
* info. If the file still has valid links, we'll get
* a break-callback msg from the server, so it doesn't
* matter that we don't discard the status info */
if (!AFS_NFSXLATORREQ(acred))
afs_TryToSmush(tvc, acred, 0);
}
ReleaseWriteLock(&tvc->lock);
#ifdef AFS_BOZONLOCK_ENV
afs_BozonUnlock(&tvc->pvnLock, tvc);
#endif
afs_PutVCache(tvc);
}
}
/* now handle ".." invalidation */
if (!oneDir) {
fileFid.Fid.Volume = aodp->f.fid.Fid.Volume;
fileFid.Cell = aodp->f.fid.Cell;
if (!fileFid.Fid.Unique)
tvc = afs_LookupVCache(&fileFid, areq, NULL, andp, aname2);
else
tvc = afs_GetVCache(&fileFid, areq, NULL, (struct vcache *)0);
if (tvc && (vType(tvc) == VDIR)) {
ObtainWriteLock(&tvc->lock, 152);
tdc1 = afs_FindDCache(tvc, (afs_size_t) 0);
if (tdc1) {
if (AFS_IS_DISCON_RW) {
#if defined(AFS_DISCON_ENV)
/* If disconnected, we need to fix (not discard) the "..".*/
afs_dir_ChangeFid(tdc1,
"..",
&aodp->f.fid.Fid.Vnode,
&andp->f.fid.Fid.Vnode);
#endif
} else {
ObtainWriteLock(&tdc1->lock, 648);
ZapDCE(tdc1); /* mark as unknown */
DZap(tdc1);
ReleaseWriteLock(&tdc1->lock);
afs_PutDCache(tdc1); /* put it back */
}
}
osi_dnlc_remove(tvc, "..", 0);
ReleaseWriteLock(&tvc->lock);
afs_PutVCache(tvc);
} else if (AFS_IS_DISCON_RW && tvc && (vType(tvc) == VREG)) {
/* XXX - Should tvc not get locked here? */
tvc->f.parent.vnode = andp->f.fid.Fid.Vnode;
tvc->f.parent.unique = andp->f.fid.Fid.Unique;
} else if (tvc) {
/* True we shouldn't come here since tvc SHOULD be a dir, but we
* 'syntactically' need to unless we change the 'if' above...
*/
afs_PutVCache(tvc);
}
}
code = returnCode;
done:
return code;
}
/*!
* Handles all the reconnection details:
* - Get all the details about the vnode: name, fid, and parent dir fid.
* - Send data to server.
* - Handle errors.
* - Reorder vhash and dcaches in their hashes, using the newly acquired fid.
*/
int
afs_ProcessOpCreate(struct vcache *avc, struct vrequest *areq,
afs_ucred_t *acred)
{
char *tname = NULL, *ttargetName = NULL;
struct AFSStoreStatus InStatus;
struct AFSFetchStatus OutFidStatus, OutDirStatus;
struct VenusFid pdir_fid, newFid;
struct AFSCallBack CallBack;
struct AFSVolSync tsync;
struct vcache *tdp = NULL, *tvc = NULL;
struct dcache *tdc = NULL;
struct afs_conn *tc;
struct rx_connection *rxconn;
afs_int32 hash, new_hash, index;
afs_size_t tlen;
int code, op = 0;
XSTATS_DECLS;
tname = afs_osi_Alloc(AFSNAMEMAX);
if (!tname)
return ENOMEM;
code = afs_GetParentVCache(avc, 0, &pdir_fid, tname, &tdp);
if (code)
goto end;
/* This data may also be in linkData, but then we have to deal with
* the joy of terminating NULLs and . and file modes. So just get
* it from the dcache where it won't have been fiddled with.
*/
if (vType(avc) == VLNK) {
afs_size_t offset;
struct dcache *tdc;
struct osi_file *tfile;
tdc = afs_GetDCache(avc, 0, areq, &offset, &tlen, 0);
if (!tdc) {
code = ENOENT;
goto end;
}
if (tlen > 1024) {
afs_PutDCache(tdc);
code = EFAULT;
goto end;
}
tlen++; /* space for NULL */
ttargetName = afs_osi_Alloc(tlen);
if (!ttargetName) {
afs_PutDCache(tdc);
return ENOMEM;
}
ObtainReadLock(&tdc->lock);
tfile = afs_CFileOpen(&tdc->f.inode);
code = afs_CFileRead(tfile, 0, ttargetName, tlen);
ttargetName[tlen-1] = '\0';
afs_CFileClose(tfile);
ReleaseReadLock(&tdc->lock);
afs_PutDCache(tdc);
}
/* Set status. */
InStatus.Mask = AFS_SETMODTIME | AFS_SETMODE | AFS_SETGROUP;
InStatus.ClientModTime = avc->f.m.Date;
InStatus.Owner = avc->f.m.Owner;
InStatus.Group = (afs_int32) afs_cr_gid(acred);
/* Only care about protection bits. */
InStatus.UnixModeBits = avc->f.m.Mode & 0xffff;
do {
tc = afs_Conn(&tdp->f.fid, areq, SHARED_LOCK, &rxconn);
if (tc) {
switch (vType(avc)) {
case VREG:
/* Make file on server. */
op = AFS_STATS_FS_RPCIDX_CREATEFILE;
XSTATS_START_TIME(op);
RX_AFS_GUNLOCK();
code = RXAFS_CreateFile(tc->id,
(struct AFSFid *)&tdp->f.fid.Fid,
tname, &InStatus,
(struct AFSFid *) &newFid.Fid,
&OutFidStatus, &OutDirStatus,
&CallBack, &tsync);
RX_AFS_GLOCK();
XSTATS_END_TIME;
break;
case VDIR:
/* Make dir on server. */
op = AFS_STATS_FS_RPCIDX_MAKEDIR;
XSTATS_START_TIME(op);
RX_AFS_GUNLOCK();
code = RXAFS_MakeDir(rxconn, (struct AFSFid *) &tdp->f.fid.Fid,
tname, &InStatus,
(struct AFSFid *) &newFid.Fid,
&OutFidStatus, &OutDirStatus,
&CallBack, &tsync);
RX_AFS_GLOCK();
XSTATS_END_TIME;
break;
case VLNK:
/* Make symlink on server. */
op = AFS_STATS_FS_RPCIDX_SYMLINK;
XSTATS_START_TIME(op);
RX_AFS_GUNLOCK();
code = RXAFS_Symlink(rxconn,
(struct AFSFid *) &tdp->f.fid.Fid,
tname, ttargetName, &InStatus,
(struct AFSFid *) &newFid.Fid,
&OutFidStatus, &OutDirStatus, &tsync);
RX_AFS_GLOCK();
XSTATS_END_TIME;
break;
default:
op = AFS_STATS_FS_RPCIDX_CREATEFILE;
code = 1;
break;
}
} else
code = -1;
} while (afs_Analyze(tc, rxconn, code, &tdp->f.fid, areq, op, SHARED_LOCK, NULL));
/* TODO: Handle errors. */
if (code) {
/* printf("afs_ProcessOpCreate: error while creating vnode on server, code=%d .\n", code); */
goto end;
}
/* The rpc doesn't set the cell number. */
newFid.Cell = avc->f.fid.Cell;
/*
* Change the fid in the dir entry.
*/
/* Seek the dir's dcache. */
tdc = afs_FindDCacheByFid(&tdp->f.fid);
if (tdc) {
/* And now change the fid in the parent dir entry. */
afs_dir_ChangeFid(tdc, tname, &avc->f.fid.Fid.Vnode, &newFid.Fid.Vnode);
afs_PutDCache(tdc);
}
if (vType(avc) == VDIR) {
/* Change fid in the dir for the "." entry. ".." has alredy been
* handled by afs_FixChildrenFids when processing the parent dir.
*/
tdc = afs_FindDCacheByFid(&avc->f.fid);
if (tdc) {
afs_dir_ChangeFid(tdc, ".", &avc->f.fid.Fid.Vnode,
&newFid.Fid.Vnode);
if (avc->f.m.LinkCount >= 2)
/* For non empty dirs, fix children's parentVnode and
* parentUnique reference.
*/
afs_FixChildrenFids(&avc->f.fid, &newFid);
afs_PutDCache(tdc);
}
}
/* Recompute hash chain positions for vnode and dcaches.
* Then change to the new FID.
*/
/* The vcache goes first. */
ObtainWriteLock(&afs_xvcache, 735);
/* Old fid hash. */
hash = VCHash(&avc->f.fid);
/* New fid hash. */
new_hash = VCHash(&newFid);
/* Remove hash from old position. */
/* XXX: not checking array element contents. It shouldn't be empty.
* If it oopses, then something else might be wrong.
*/
if (afs_vhashT[hash] == avc) {
/* First in hash chain (might be the only one). */
afs_vhashT[hash] = avc->hnext;
} else {
/* More elements in hash chain. */
for (tvc = afs_vhashT[hash]; tvc; tvc = tvc->hnext) {
if (tvc->hnext == avc) {
tvc->hnext = avc->hnext;
break;
}
}
} /* if (!afs_vhashT[i]->hnext) */
QRemove(&avc->vhashq);
/* Insert hash in new position. */
avc->hnext = afs_vhashT[new_hash];
afs_vhashT[new_hash] = avc;
QAdd(&afs_vhashTV[VCHashV(&newFid)], &avc->vhashq);
ReleaseWriteLock(&afs_xvcache);
/* Do the same thing for all dcaches. */
hash = DVHash(&avc->f.fid);
ObtainWriteLock(&afs_xdcache, 743);
for (index = afs_dvhashTbl[hash]; index != NULLIDX; index = hash) {
hash = afs_dvnextTbl[index];
tdc = afs_GetValidDSlot(index);
ReleaseReadLock(&tdc->tlock);
if (afs_indexUnique[index] == avc->f.fid.Fid.Unique) {
if (!FidCmp(&tdc->f.fid, &avc->f.fid)) {
/* Safer but slower. */
afs_HashOutDCache(tdc, 0);
/* Put dcache in new positions in the dchash and dvhash. */
new_hash = DCHash(&newFid, tdc->f.chunk);
afs_dcnextTbl[tdc->index] = afs_dchashTbl[new_hash];
afs_dchashTbl[new_hash] = tdc->index;
new_hash = DVHash(&newFid);
afs_dvnextTbl[tdc->index] = afs_dvhashTbl[new_hash];
afs_dvhashTbl[new_hash] = tdc->index;
afs_indexUnique[tdc->index] = newFid.Fid.Unique;
memcpy(&tdc->f.fid, &newFid, sizeof(struct VenusFid));
} /* if fid match */
} /* if uniquifier match */
if (tdc)
afs_PutDCache(tdc);
} /* for all dcaches in this hash bucket */
ReleaseWriteLock(&afs_xdcache);
/* Now we can set the new fid. */
memcpy(&avc->f.fid, &newFid, sizeof(struct VenusFid));
end:
if (tdp)
afs_PutVCache(tdp);
afs_osi_Free(tname, AFSNAMEMAX);
if (ttargetName)
afs_osi_Free(ttargetName, tlen);
return code;
}