/*
* Lookup the user file name,
* Handle allocation and freeing of pathname buffer, return error.
*/
int
lookupnameatcred(
char *fnamep, /* user pathname */
enum uio_seg seg, /* addr space that name is in */
int followlink, /* follow sym links */
vnode_t **dirvpp, /* ret for ptr to parent dir vnode */
vnode_t **compvpp, /* ret for ptr to component vnode */
vnode_t *startvp, /* start path search from vp */
cred_t *cr) /* credential */
{
char namebuf[TYPICALMAXPATHLEN];
struct pathname lookpn;
int error;
error = pn_get_buf(fnamep, seg, &lookpn, namebuf, sizeof (namebuf));
if (error == 0) {
error = lookuppnatcred(&lookpn, NULL, followlink,
dirvpp, compvpp, startvp, cr);
}
if (error == ENAMETOOLONG) {
/*
* This thread used a pathname > TYPICALMAXPATHLEN bytes long.
*/
if (error = pn_get(fnamep, seg, &lookpn))
return (error);
error = lookuppnatcred(&lookpn, NULL, followlink,
dirvpp, compvpp, startvp, cr);
pn_free(&lookpn);
}
return (error);
}
/*
* Pull a path name from user or kernel space.
*/
int
pn_get(char *str, enum uio_seg seg, struct pathname *pnp)
{
int error;
void *buf;
buf = kmem_alloc(MAXPATHLEN, KM_SLEEP);
if ((error = pn_get_buf(str, seg, pnp, buf, MAXPATHLEN)) != 0)
pn_free(pnp);
return (error);
}
void *
osi_UfsOpen(afs_dcache_id_t *ainode)
{
#ifdef AFS_CACHE_VNODE_PATH
struct vnode *vp;
#else
struct inode *ip;
#endif
struct osi_file *afile = NULL;
afs_int32 code = 0;
int dummy;
#ifdef AFS_CACHE_VNODE_PATH
char namebuf[1024];
struct pathname lookpn;
#endif
struct osi_stat tstat;
afile = osi_AllocSmallSpace(sizeof(struct osi_file));
AFS_GUNLOCK();
/*
* AFS_CACHE_VNODE_PATH can be used with any file system, including ZFS or tmpfs.
* The ainode is not an inode number but a path.
*/
#ifdef AFS_CACHE_VNODE_PATH
/* Can not use vn_open or lookupname, they use user's CRED()
* We need to run as root So must use low level lookuppnvp
* assume fname starts with /
*/
code = pn_get_buf(ainode->ufs, AFS_UIOSYS, &lookpn, namebuf, sizeof(namebuf));
if (code != 0)
osi_Panic("UfsOpen: pn_get_buf failed %ld %s", code, ainode->ufs);
VN_HOLD(rootdir); /* released in loopuppnvp */
code = lookuppnvp(&lookpn, NULL, FOLLOW, NULL, &vp,
rootdir, rootdir, afs_osi_credp);
if (code != 0)
osi_Panic("UfsOpen: lookuppnvp failed %ld %s", code, ainode->ufs);
#ifdef AFS_SUN511_ENV
code = VOP_OPEN(&vp, FREAD|FWRITE, afs_osi_credp, NULL);
#else
code = VOP_OPEN(&vp, FREAD|FWRITE, afs_osi_credp);
#endif
if (code != 0)
osi_Panic("UfsOpen: VOP_OPEN failed %ld %s", code, ainode->ufs);
#else
code =
igetinode(afs_cacheVfsp, (dev_t) cacheDev.dev, ainode->ufs, &ip,
CRED(), &dummy);
#endif
AFS_GLOCK();
if (code) {
osi_FreeSmallSpace(afile);
osi_Panic("UfsOpen: igetinode failed %ld %s", code, ainode->ufs);
}
#ifdef AFS_CACHE_VNODE_PATH
afile->vnode = vp;
code = afs_osi_Stat(afile, &tstat);
afile->size = tstat.size;
#else
afile->vnode = ITOV(ip);
afile->size = VTOI(afile->vnode)->i_size;
#endif
afile->offset = 0;
afile->proc = (int (*)())0;
return (void *)afile;
}
