static struct dentry *afs_export_get_parent(struct dentry *child)
{
struct VenusFid tfid;
struct vrequest treq;
struct cell *tcell;
struct vcache *vcp;
struct dentry *dp = NULL;
cred_t *credp;
afs_uint32 cellidx;
int code;
if (!child->d_inode) {
/* can't find the parent of a negative dentry */
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_parent(%s): no inode\n",
child->d_name.name ? (char *)child->d_name.name : "?");
#endif
return ERR_PTR(-EIO);
}
credp = crref();
AFS_GLOCK();
vcp = VTOAFS(child->d_inode);
if (afs_IsDynrootMount(vcp)) {
/* the dynmount directory; parent is always the AFS root */
tfid = afs_globalVp->f.fid;
} else if (afs_IsDynrootAny(vcp) &&
VNUM_TO_VNTYPE(vcp->f.fid.Fid.Vnode) == VN_TYPE_MOUNT) {
/* a mount point in the dynmount directory */
afs_GetDynrootMountFid(&tfid);
} else if (vcp->mvstat == 2) {
/* volume root */
ObtainReadLock(&vcp->lock);
if (vcp->mvid && vcp->mvid->Fid.Volume) {
tfid = *vcp->mvid;
ReleaseReadLock(&vcp->lock);
} else {
ReleaseReadLock(&vcp->lock);
tcell = afs_GetCell(vcp->f.fid.Cell, READ_LOCK);
if (!tcell) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_parent(0x%08x/%d/%d.%d): no cell\n",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique);
#endif
dp = ERR_PTR(-ENOENT);
goto done;
}
cellidx = tcell->cellIndex;
afs_PutCell(tcell, READ_LOCK);
afs_GetDynrootMountFid(&tfid);
tfid.Fid.Vnode = VNUM_FROM_TYPEID(VN_TYPE_MOUNT, cellidx << 2);
tfid.Fid.Unique = vcp->f.fid.Fid.Volume;
}
} else {
/* any other vnode */
if (vType(vcp) == VDIR && !vcp->f.parent.vnode && vcp->mvstat != 1) {
code = afs_InitReq(&treq, credp);
if (code) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_parent(0x%08x/%d/%d.%d): InitReq: %d\n",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique, code);
#endif
dp = ERR_PTR(-ENOENT);
goto done;
} else {
code = update_dir_parent(&treq, vcp);
if (code) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_parent(0x%08x/%d/%d.%d): update_dir_parent: %d\n",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique, code);
#endif
dp = ERR_PTR(-ENOENT);
goto done;
}
}
}
tfid.Cell = vcp->f.fid.Cell;
tfid.Fid.Volume = vcp->f.fid.Fid.Volume;
tfid.Fid.Vnode = vcp->f.parent.vnode;
tfid.Fid.Unique = vcp->f.parent.unique;
}
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_parent(0x%08x/%d/%d.%d): => 0x%08x/%d/%d.%d\n",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique,
tfid.Cell, tfid.Fid.Volume, tfid.Fid.Vnode, tfid.Fid.Unique);
#endif
dp = get_dentry_from_fid(credp, &tfid);
if (!dp) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_parent(0x%08x/%d/%d.%d): no dentry\n",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique);
#endif
dp = ERR_PTR(-ENOENT);
}
done:
AFS_GUNLOCK();
crfree(credp);
return dp;
}
/* 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;
}
static int afs_export_get_name(struct dentry *parent, char *name,
struct dentry *child)
{
struct afs_fakestat_state fakestate;
struct get_name_data data;
struct vrequest treq;
struct volume *tvp;
struct vcache *vcp;
struct dcache *tdc;
cred_t *credp;
afs_size_t dirOffset, dirLen;
afs_int32 code = 0;
if (!parent->d_inode) {
#ifdef OSI_EXPORT_DEBUG
/* can't lookup name in a negative dentry */
printk("afs: get_name(%s, %s): no parent inode\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
child->d_name.name ? (char *)child->d_name.name : "?");
#endif
return -EIO;
}
if (!child->d_inode) {
#ifdef OSI_EXPORT_DEBUG
/* can't find the FID of negative dentry */
printk("afs: get_name(%s, %s): no child inode\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
child->d_name.name ? (char *)child->d_name.name : "?");
#endif
return -ENOENT;
}
afs_InitFakeStat(&fakestate);
credp = crref();
AFS_GLOCK();
vcp = VTOAFS(child->d_inode);
/* special case dynamic mount directory */
if (afs_IsDynrootMount(vcp)) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): this is the dynmount dir\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique);
#endif
data.fid = vcp->f.fid;
if (VTOAFS(parent->d_inode) == afs_globalVp)
strcpy(name, AFS_DYNROOT_MOUNTNAME);
else
code = -ENOENT;
goto done;
}
/* Figure out what FID to look for */
if (vcp->mvstat == 2) { /* volume root */
tvp = afs_GetVolume(&vcp->f.fid, 0, READ_LOCK);
if (!tvp) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): no volume for root\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique);
#endif
code = ENOENT;
goto done;
}
data.fid = tvp->mtpoint;
afs_PutVolume(tvp, READ_LOCK);
} else {
data.fid = vcp->f.fid;
}
vcp = VTOAFS(parent->d_inode);
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): parent is 0x%08x/%d/%d.%d\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique,
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique);
#endif
code = afs_InitReq(&treq, credp);
if (code) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): afs_InitReq: %d\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique, code);
#endif
goto done;
}
/* a dynamic mount point in the dynamic mount directory */
if (afs_IsDynrootMount(vcp) && afs_IsDynrootAnyFid(&data.fid)
&& VNUM_TO_VNTYPE(data.fid.Fid.Vnode) == VN_TYPE_MOUNT) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): dynamic mount point\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique);
#endif
vcp = afs_GetVCache(&data.fid, &treq, NULL, NULL);
if (vcp) {
ObtainReadLock(&vcp->lock);
if (strlen(vcp->linkData + 1) <= NAME_MAX)
strcpy(name, vcp->linkData + 1);
else
code = ENOENT;
ReleaseReadLock(&vcp->lock);
afs_PutVCache(vcp);
} else {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): no vcache\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique);
#endif
code = ENOENT;
}
goto done;
}
code = afs_EvalFakeStat(&vcp, &fakestate, &treq);
if (code)
goto done;
if (vcp->f.fid.Cell != data.fid.Cell ||
vcp->f.fid.Fid.Volume != data.fid.Fid.Volume) {
/* parent is not the expected cell and volume; thus it
* cannot possibly contain the fid we are looking for */
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): wrong parent 0x%08x/%d\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique,
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume);
#endif
code = ENOENT;
goto done;
}
redo:
if (!(vcp->f.states & CStatd)) {
if ((code = afs_VerifyVCache2(vcp, &treq))) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): VerifyVCache2(0x%08x/%d/%d.%d): %d\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique,
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique, code);
#endif
goto done;
}
}
tdc = afs_GetDCache(vcp, (afs_size_t) 0, &treq, &dirOffset, &dirLen, 1);
if (!tdc) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): GetDCache(0x%08x/%d/%d.%d): %d\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique,
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique, code);
#endif
code = EIO;
goto done;
}
ObtainReadLock(&vcp->lock);
ObtainReadLock(&tdc->lock);
/*
* Make sure that the data in the cache is current. There are two
* cases we need to worry about:
* 1. The cache data is being fetched by another process.
* 2. The cache data is no longer valid
*/
while ((vcp->f.states & CStatd)
&& (tdc->dflags & DFFetching)
&& hsame(vcp->f.m.DataVersion, tdc->f.versionNo)) {
ReleaseReadLock(&tdc->lock);
ReleaseReadLock(&vcp->lock);
afs_osi_Sleep(&tdc->validPos);
ObtainReadLock(&vcp->lock);
ObtainReadLock(&tdc->lock);
}
if (!(vcp->f.states & CStatd)
|| !hsame(vcp->f.m.DataVersion, tdc->f.versionNo)) {
ReleaseReadLock(&tdc->lock);
ReleaseReadLock(&vcp->lock);
afs_PutDCache(tdc);
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): dir (0x%08x/%d/%d.%d) changed; retrying\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique,
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique);
#endif
goto redo;
}
data.name = name;
data.found = 0;
code = afs_dir_EnumerateDir(tdc, get_name_hook, &data);
if (!code && !data.found) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): not found\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique);
#endif
code = ENOENT;
} else if (code) {
#ifdef OSI_EXPORT_DEBUG
printk("afs: get_name(%s, 0x%08x/%d/%d.%d): Enumeratedir(0x%08x/%d/%d.%d): %d\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique,
vcp->f.fid.Cell, vcp->f.fid.Fid.Volume,
vcp->f.fid.Fid.Vnode, vcp->f.fid.Fid.Unique, code);
#endif
}
ReleaseReadLock(&tdc->lock);
ReleaseReadLock(&vcp->lock);
afs_PutDCache(tdc);
done:
if (!code) {
printk("afs: get_name(%s, 0x%08x/%d/%d.%d) => %s\n",
parent->d_name.name ? (char *)parent->d_name.name : "?",
data.fid.Cell, data.fid.Fid.Volume,
data.fid.Fid.Vnode, data.fid.Fid.Unique, name);
}
afs_PutFakeStat(&fakestate);
AFS_GUNLOCK();
crfree(credp);
code = afs_CheckCode(code, &treq, 102);
return -code;
}
/* Note that we don't set CDirty here, this is OK because the unlink
* RPC is called synchronously */
int
afs_remove(OSI_VC_DECL(adp), char *aname, afs_ucred_t *acred)
{
struct vrequest *treq = NULL;
struct dcache *tdc;
struct VenusFid unlinkFid;
afs_int32 code;
struct vcache *tvc;
afs_size_t offset, len;
struct afs_fakestat_state fakestate;
OSI_VC_CONVERT(adp);
AFS_STATCNT(afs_remove);
afs_Trace2(afs_iclSetp, CM_TRACE_REMOVE, ICL_TYPE_POINTER, adp,
ICL_TYPE_STRING, aname);
if ((code = afs_CreateReq(&treq, acred))) {
return code;
}
afs_InitFakeStat(&fakestate);
AFS_DISCON_LOCK();
code = afs_EvalFakeStat(&adp, &fakestate, treq);
if (code)
goto done;
/* Check if this is dynroot */
if (afs_IsDynroot(adp)) {
code = afs_DynrootVOPRemove(adp, acred, aname);
goto done;
}
if (afs_IsDynrootMount(adp)) {
code = EROFS;
goto done;
}
if (strlen(aname) > AFSNAMEMAX) {
code = ENAMETOOLONG;
goto done;
}
tagain:
code = afs_VerifyVCache(adp, treq);
tvc = NULL;
if (code) {
code = afs_CheckCode(code, treq, 23);
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 we're running disconnected without logging, go no further... */
if (AFS_IS_DISCONNECTED && !AFS_IS_DISCON_RW) {
code = ENETDOWN;
goto done;
}
tdc = afs_GetDCache(adp, (afs_size_t) 0, treq, &offset, &len, 1); /* test for error below */
ObtainWriteLock(&adp->lock, 142);
if (tdc)
ObtainSharedLock(&tdc->lock, 638);
/*
* 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;
}
unlinkFid.Fid.Vnode = 0;
if (!tvc) {
tvc = osi_dnlc_lookup(adp, aname, WRITE_LOCK);
}
/* This should not be necessary since afs_lookup() has already
* done the work.
*/
if (!tvc)
if (tdc) {
code = afs_dir_Lookup(tdc, aname, &unlinkFid.Fid);
if (code == 0) {
afs_int32 cached = 0;
unlinkFid.Cell = adp->f.fid.Cell;
unlinkFid.Fid.Volume = adp->f.fid.Fid.Volume;
if (unlinkFid.Fid.Unique == 0) {
tvc =
afs_LookupVCache(&unlinkFid, treq, &cached, adp,
aname);
} else {
ObtainReadLock(&afs_xvcache);
tvc = afs_FindVCache(&unlinkFid, 0, DO_STATS);
ReleaseReadLock(&afs_xvcache);
}
}
}
if (AFS_IS_DISCON_RW) {
if (!adp->f.shadow.vnode && !(adp->f.ddirty_flags & VDisconCreate)) {
/* Make shadow copy of parent dir. */
afs_MakeShadowDir(adp, tdc);
}
/* Can't hold a dcache lock whilst we're getting a vcache one */
if (tdc)
ReleaseSharedLock(&tdc->lock);
/* XXX - We're holding adp->lock still, and we've got no
* guarantee about whether the ordering matches the lock hierarchy */
ObtainWriteLock(&tvc->lock, 713);
/* If we were locally created, then we don't need to do very
* much beyond ensuring that we don't exist anymore */
if (tvc->f.ddirty_flags & VDisconCreate) {
afs_DisconRemoveDirty(tvc);
} else {
/* Add removed file vcache to dirty list. */
afs_DisconAddDirty(tvc, VDisconRemove, 1);
}
adp->f.m.LinkCount--;
ReleaseWriteLock(&tvc->lock);
if (tdc)
ObtainSharedLock(&tdc->lock, 714);
}
if (tvc && osi_Active(tvc)) {
/* about to delete whole file, prefetch it first */
ReleaseWriteLock(&adp->lock);
if (tdc)
ReleaseSharedLock(&tdc->lock);
ObtainWriteLock(&tvc->lock, 143);
FetchWholeEnchilada(tvc, treq);
ReleaseWriteLock(&tvc->lock);
ObtainWriteLock(&adp->lock, 144);
/* Technically I don't think we need this back, but let's hold it
anyway; The "got" reference should actually be sufficient. */
if (tdc)
ObtainSharedLock(&tdc->lock, 640);
}
osi_dnlc_remove(adp, aname, tvc);
Tadp1 = adp;
#ifndef AFS_DARWIN80_ENV
Tadpr = VREFCOUNT(adp);
#endif
Ttvc = tvc;
Tnam = aname;
Tnam1 = 0;
#ifndef AFS_DARWIN80_ENV
if (tvc)
Ttvcr = VREFCOUNT(tvc);
#endif
#ifdef AFS_AIX_ENV
if (tvc && VREFCOUNT_GT(tvc, 2) && tvc->opens > 0
&& !(tvc->f.states & CUnlinked)) {
#else
if (tvc && VREFCOUNT_GT(tvc, 1) && tvc->opens > 0
&& !(tvc->f.states & CUnlinked)) {
#endif
char *unlname = afs_newname();
ReleaseWriteLock(&adp->lock);
if (tdc)
ReleaseSharedLock(&tdc->lock);
code = afsrename(adp, aname, adp, unlname, acred, treq);
Tnam1 = unlname;
if (!code) {
void *oldmvid = NULL;
if (tvc->mvid.silly_name)
oldmvid = tvc->mvid.silly_name;
tvc->mvid.silly_name = unlname;
if (oldmvid)
osi_FreeSmallSpace(oldmvid);
crhold(acred);
if (tvc->uncred) {
crfree(tvc->uncred);
}
tvc->uncred = acred;
tvc->f.states |= CUnlinked;
/* if rename succeeded, remove should not */
ObtainWriteLock(&tvc->lock, 715);
if (tvc->f.ddirty_flags & VDisconRemove) {
tvc->f.ddirty_flags &= ~VDisconRemove;
}
ReleaseWriteLock(&tvc->lock);
} else {
osi_FreeSmallSpace(unlname);
}
if (tdc)
afs_PutDCache(tdc);
afs_PutVCache(tvc);
} else {
code = afsremove(adp, tdc, tvc, aname, acred, treq);
}
done:
afs_PutFakeStat(&fakestate);
#if !defined(AFS_DARWIN80_ENV) && !defined(UKERNEL)
/* we can't track by thread, it's not exported in the KPI; only do
this on !macos */
osi_Assert(!WriteLocked(&adp->lock) || (adp->lock.pid_writer != MyPidxx));
#endif
AFS_DISCON_UNLOCK();
afs_DestroyReq(treq);
return code;
}
/* afs_remunlink -- This tries to delete the file at the server after it has
* been renamed when unlinked locally but now has been finally released.
*
* CAUTION -- may be called with avc unheld. */
int
afs_remunlink(struct vcache *avc, int doit)
{
afs_ucred_t *cred;
char *unlname;
struct vcache *adp;
struct VenusFid dirFid;
struct dcache *tdc;
afs_int32 code = 0;
if (NBObtainWriteLock(&avc->lock, 423))
return 0;
#if defined(AFS_DARWIN80_ENV)
if (vnode_get(AFSTOV(avc))) {
ReleaseWriteLock(&avc->lock);
return 0;
}
#endif
if (avc->mvid.silly_name && (doit || (avc->f.states & CUnlinkedDel))) {
struct vrequest *treq = NULL;
if ((code = afs_CreateReq(&treq, avc->uncred))) {
ReleaseWriteLock(&avc->lock);
} else {
/* Must bump the refCount because GetVCache may block.
* Also clear mvid so no other thread comes here if we block.
*/
unlname = avc->mvid.silly_name;
avc->mvid.silly_name = NULL;
cred = avc->uncred;
avc->uncred = NULL;
#if defined(AFS_DARWIN_ENV) && !defined(AFS_DARWIN80_ENV)
VREF(AFSTOV(avc));
#else
AFS_FAST_HOLD(avc);
#endif
/* We'll only try this once. If it fails, just release the vnode.
* Clear after doing hold so that NewVCache doesn't find us yet.
*/
avc->f.states &= ~(CUnlinked | CUnlinkedDel);
ReleaseWriteLock(&avc->lock);
dirFid.Cell = avc->f.fid.Cell;
dirFid.Fid.Volume = avc->f.fid.Fid.Volume;
dirFid.Fid.Vnode = avc->f.parent.vnode;
dirFid.Fid.Unique = avc->f.parent.unique;
adp = afs_GetVCache(&dirFid, treq, NULL, NULL);
if (adp) {
tdc = afs_FindDCache(adp, (afs_size_t) 0);
ObtainWriteLock(&adp->lock, 159);
if (tdc)
ObtainSharedLock(&tdc->lock, 639);
/* afsremove releases the adp & tdc locks, and does vn_rele(avc) */
code = afsremove(adp, tdc, avc, unlname, cred, treq);
afs_PutVCache(adp);
} else {
/* we failed - and won't be back to try again. */
afs_PutVCache(avc);
}
osi_FreeSmallSpace(unlname);
crfree(cred);
afs_DestroyReq(treq);
}
} else {
#if defined(AFS_DARWIN80_ENV)
vnode_put(AFSTOV(avc));
#endif
ReleaseWriteLock(&avc->lock);
}
return code;
}
