/*
* Inform dynroot that a new vnode is being created. Return value
* is non-zero if this vnode is handled by dynroot, in which case
* FetchStatus will be filled in.
*/
int
afs_DynrootNewVnode(struct vcache *avc, struct AFSFetchStatus *status)
{
char *bp, tbuf[CVBS];
if (_afs_IsDynrootFid(&avc->f.fid)) {
if (!afs_dynrootEnable)
return 0;
afs_GetDynroot(0, 0, status);
afs_PutDynroot();
return 1;
}
if (afs_IsDynrootMount(avc)) {
afs_GetDynrootMount(0, 0, status);
afs_PutDynroot();
return 1;
}
/*
* Check if this is an entry under /afs, e.g. /afs/cellname.
*/
if (avc->f.fid.Cell == afs_dynrootCell
&& avc->f.fid.Fid.Volume == AFS_DYNROOT_VOLUME) {
struct cell *c;
struct cell_alias *ca;
int namelen, linklen, cellidx, rw;
memset(status, 0, sizeof(struct AFSFetchStatus));
status->FileType = SymbolicLink;
status->LinkCount = 1;
status->DataVersion = 1;
status->CallerAccess = PRSFS_LOOKUP | PRSFS_READ;
status->AnonymousAccess = PRSFS_LOOKUP | PRSFS_READ;
status->ParentVnode = 1;
status->ParentUnique = 1;
if (VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode) == VN_TYPE_SYMLINK) {
struct afs_dynSymlink *ts;
int index = VNUM_TO_VNID(avc->f.fid.Fid.Vnode);
ObtainReadLock(&afs_dynSymlinkLock);
ts = afs_dynSymlinkBase;
while (ts) {
if (ts->index == index)
break;
ts = ts->next;
}
if (ts) {
linklen = strlen(ts->target);
avc->linkData = afs_osi_Alloc(linklen + 1);
strcpy(avc->linkData, ts->target);
status->Length = linklen;
status->UnixModeBits = 0755;
}
ReleaseReadLock(&afs_dynSymlinkLock);
return ts ? 1 : 0;
}
if (VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode) != VN_TYPE_CELL
&& VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode) != VN_TYPE_ALIAS
&& VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode) != VN_TYPE_MOUNT) {
afs_warn("dynroot vnode inconsistency, unknown VNTYPE %d\n",
VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode));
return 0;
}
cellidx = VNUM_TO_CIDX(avc->f.fid.Fid.Vnode);
rw = VNUM_TO_RW(avc->f.fid.Fid.Vnode);
if (VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode) == VN_TYPE_ALIAS) {
char *realName;
ca = afs_GetCellAlias(cellidx);
if (!ca) {
afs_warn("dynroot vnode inconsistency, can't find alias %d\n",
cellidx);
return 0;
}
/*
* linkData needs to contain the name of the cell
* we're aliasing for.
*/
realName = ca->cell;
if (!realName) {
afs_warn("dynroot: alias %s missing real cell name\n",
ca->alias);
avc->linkData = afs_strdup("unknown");
linklen = 7;
} else {
int namelen = strlen(realName);
linklen = rw + namelen;
avc->linkData = afs_osi_Alloc(linklen + 1);
strcpy(avc->linkData, rw ? "." : "");
afs_strcat(avc->linkData, realName);
}
status->UnixModeBits = 0755;
afs_PutCellAlias(ca);
} else if (VNUM_TO_VNTYPE(avc->f.fid.Fid.Vnode) == VN_TYPE_MOUNT) {
c = afs_GetCellByIndex(cellidx, READ_LOCK);
if (!c) {
afs_warn("dynroot vnode inconsistency, can't find cell %d\n",
cellidx);
return 0;
}
/*
* linkData needs to contain "%cell:volumeid"
*/
namelen = strlen(c->cellName);
bp = afs_cv2string(&tbuf[CVBS], avc->f.fid.Fid.Unique);
linklen = 2 + namelen + strlen(bp);
avc->linkData = afs_osi_Alloc(linklen + 1);
strcpy(avc->linkData, "%");
afs_strcat(avc->linkData, c->cellName);
afs_strcat(avc->linkData, ":");
afs_strcat(avc->linkData, bp);
status->UnixModeBits = 0644;
status->ParentVnode = AFS_DYNROOT_MOUNT_VNODE;
afs_PutCell(c, READ_LOCK);
} else {
c = afs_GetCellByIndex(cellidx, READ_LOCK);
if (!c) {
afs_warn("dynroot vnode inconsistency, can't find cell %d\n",
cellidx);
return 0;
}
/*
* linkData needs to contain "#cell:root.cell" or "%cell:root.cell"
*/
namelen = strlen(c->cellName);
linklen = 1 + namelen + 10;
avc->linkData = afs_osi_Alloc(linklen + 1);
strcpy(avc->linkData, rw ? "%" : "#");
afs_strcat(avc->linkData, c->cellName);
afs_strcat(avc->linkData, ":root.cell");
status->UnixModeBits = 0644;
afs_PutCell(c, READ_LOCK);
}
status->Length = linklen;
return 1;
}
return 0;
}
static int afs_encode_fh(struct dentry *de, __u32 *fh, int *max_len,
int connectable)
{
struct vcache *tvc;
struct cell *tc;
int vntype;
if (!de->d_inode) /* encode a negative dentry?! */
return 255;
if (*max_len < 4) /* not enough space */
return 255;
tvc = VTOAFS(de->d_inode);
#ifdef OSI_EXPORT_DEBUG
printk("afs: encode_fh(0x%08x/%d/%d.%d)\n",
tvc->f.fid.Cell, tvc->f.fid.Fid.Volume,
tvc->f.fid.Fid.Vnode, tvc->f.fid.Fid.Unique);
#endif
if (afs_IsDynrootAnyFid(&tvc->f.fid)) {
vntype = VNUM_TO_VNTYPE(tvc->f.fid.Fid.Vnode);
switch (vntype) {
case 0:
/* encode as a normal filehandle */
break;
case VN_TYPE_MOUNT:
if (*max_len < 5) {
return 255;
}
/* fall through */
case VN_TYPE_CELL:
case VN_TYPE_ALIAS:
AFS_GLOCK();
tc = afs_GetCellByIndex(VNUM_TO_CIDX(tvc->f.fid.Fid.Vnode),
READ_LOCK);
if (!tc) {
AFS_GUNLOCK();
return 255;
}
memcpy((void *)fh, tc->cellHandle, 16);
afs_PutCell(tc, READ_LOCK);
AFS_GUNLOCK();
if (vntype == VN_TYPE_MOUNT) {
fh[4] = htonl(tvc->f.fid.Fid.Unique);
*max_len = 5;
return AFSFH_DYN_MOUNT;
}
*max_len = 4;
if (vntype == VN_TYPE_CELL) {
return AFSFH_DYN_RO_CELL | VNUM_TO_RW(tvc->f.fid.Fid.Vnode);
} else {
return AFSFH_DYN_RO_LINK | VNUM_TO_RW(tvc->f.fid.Fid.Vnode);
}
case VN_TYPE_SYMLINK:
/* XXX fill in filehandle for dynroot symlink */
/* XXX return AFSFH_DYN_SYMLINK; */
default:
return 255;
}
}
if (*max_len < 7) {
/* not big enough for a migratable filehandle */
/* always encode in network order */
fh[0] = htonl(tvc->f.fid.Cell);
fh[1] = htonl(tvc->f.fid.Fid.Volume);
fh[2] = htonl(tvc->f.fid.Fid.Vnode);
fh[3] = htonl(tvc->f.fid.Fid.Unique);
*max_len = 4;
return AFSFH_NET_VENUSFID;
}
AFS_GLOCK();
tc = afs_GetCell(tvc->f.fid.Cell, READ_LOCK);
if (!tc) {
AFS_GUNLOCK();
return 255;
}
memcpy((void *)fh, tc->cellHandle, 16);
afs_PutCell(tc, READ_LOCK);
AFS_GUNLOCK();
/* always encode in network order */
fh[4] = htonl(tvc->f.fid.Fid.Volume);
fh[5] = htonl(tvc->f.fid.Fid.Vnode);
fh[6] = htonl(tvc->f.fid.Fid.Unique);
*max_len = 7;
return AFSFH_NET_CELLFID;
}
