STATIC int
linvfs_readlink(
struct dentry *dentry,
char *buf,
int size)
{
vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
uio_t uio;
iovec_t iov;
int error;
iov.iov_base = buf;
iov.iov_len = size;
uio.uio_iov = &iov;
uio.uio_offset = 0;
uio.uio_segflg = UIO_USERSPACE;
uio.uio_resid = size;
uio.uio_iovcnt = 1;
VOP_READLINK(vp, &uio, 0, NULL, error);
if (error)
return -error;
return (size - uio.uio_resid);
}
int
#endif
vnode_iop_follow_link(
DENT_T *dentry, /* link */
struct nameidata *nd /* link resolution */
)
{
INODE_T *ip;
struct uio uio;
iovec_t iov;
int err = 0;
char *buf = KMEM_ALLOC(PATH_MAX, KM_SLEEP);
CALL_DATA_T cd;
if (buf == NULL)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
return ERR_PTR(-ENOMEM);
#else
return -ENOMEM;
#endif
uio.uio_iov = &iov;
mfs_uioset(&uio, buf, PATH_MAX-1, 0, UIO_SYSSPACE);
mdki_linux_init_call_data(&cd);
ip = dentry->d_inode;
ASSERT_KERNEL_UNLOCKED();
ASSERT_I_SEM_NOT_MINE(ip);
err = VOP_READLINK(ITOV(ip), &uio, &cd);
err = mdki_errno_unix_to_linux(err);
mdki_linux_destroy_call_data(&cd);
if (err == 0) {
if (uio.uio_resid == 0)
err = -ENAMETOOLONG;
else {
/* readlink doesn't copy a NUL at the end, we must do it */
buf[uio.uio_offset] = '\0';
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
/* follow the link */
err = vfs_follow_link(nd, buf);
#else
nd_set_link(nd, buf);
return(buf); /* vnop_iop_put_link() will free this buf. */
#endif
}
}
KMEM_FREE(buf, PATH_MAX);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
return ERR_PTR(err);
#else
return(err);
#endif
}
/*
* Read the contents of a symbolic link.
*/
ssize_t
readlink(char *name, char *buf, size_t count)
{
vnode_t *vp;
struct iovec aiov;
struct uio auio;
int error;
struct vattr vattr;
ssize_t cnt;
int estale_retry = 0;
if ((cnt = (ssize_t)count) < 0)
return (set_errno(EINVAL));
lookup:
if (error = lookupname(name, UIO_USERSPACE, NO_FOLLOW, NULLVPP, &vp)) {
if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
goto lookup;
return (set_errno(error));
}
if (vp->v_type != VLNK) {
/*
* Ask the underlying filesystem if it wants this
* object to look like a symlink at user-level.
*/
vattr.va_mask = AT_TYPE;
error = VOP_GETATTR(vp, &vattr, 0, CRED(), NULL);
if (error || vattr.va_type != VLNK) {
VN_RELE(vp);
if ((error == ESTALE) &&
fs_need_estale_retry(estale_retry++))
goto lookup;
return (set_errno(EINVAL));
}
}
aiov.iov_base = buf;
aiov.iov_len = cnt;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_loffset = 0;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_extflg = UIO_COPY_CACHED;
auio.uio_resid = cnt;
error = VOP_READLINK(vp, &auio, CRED(), NULL);
VN_RELE(vp);
if (error) {
if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
goto lookup;
return (set_errno(error));
}
return ((ssize_t)(cnt - auio.uio_resid));
}
int
RUMP_VOP_READLINK(struct vnode *vp,
struct uio *uio,
struct kauth_cred *cred)
{
int error;
rump_schedule();
error = VOP_READLINK(vp, uio, cred);
rump_unschedule();
return error;
}
static int zfsfuse_readlink(fuse_req_t req, fuse_ino_t ino)
{
vfs_t *vfs = (vfs_t *) fuse_req_userdata(req);
zfsvfs_t *zfsvfs = vfs->vfs_data;
ZFS_ENTER(zfsvfs);
znode_t *znode;
int error = zfs_zget(zfsvfs, ino, &znode, B_FALSE);
if(error) {
ZFS_EXIT(zfsvfs);
/* If the inode we are trying to get was recently deleted
dnode_hold_impl will return EEXIST instead of ENOENT */
return error == EEXIST ? ENOENT : error;
}
ASSERT(znode != NULL);
vnode_t *vp = ZTOV(znode);
ASSERT(vp != NULL);
char buffer[PATH_MAX + 1];
iovec_t iovec;
uio_t uio;
uio.uio_iov = &iovec;
uio.uio_iovcnt = 1;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_fmode = 0;
uio.uio_llimit = RLIM64_INFINITY;
iovec.iov_base = buffer;
iovec.iov_len = sizeof(buffer) - 1;
uio.uio_resid = iovec.iov_len;
uio.uio_loffset = 0;
cred_t cred;
zfsfuse_getcred(req, &cred);
error = VOP_READLINK(vp, &uio, &cred, NULL);
VN_RELE(vp);
ZFS_EXIT(zfsvfs);
if(!error) {
VERIFY(uio.uio_loffset < sizeof(buffer));
buffer[uio.uio_loffset] = '\0';
fuse_reply_readlink(req, buffer);
}
return error;
}
/*
* careful here - this function can get called recursively, so
* we need to be very careful about how much stack we use.
* uio is kmalloced for this reason...
*/
STATIC int
linvfs_follow_link(
struct dentry *dentry,
struct nameidata *nd)
{
vnode_t *vp;
uio_t *uio;
iovec_t iov;
int error;
char *link;
ASSERT(dentry);
ASSERT(nd);
link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
if (!link)
return -ENOMEM;
uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
if (!uio) {
kfree(link);
return -ENOMEM;
}
vp = LINVFS_GET_VP(dentry->d_inode);
iov.iov_base = link;
iov.iov_len = MAXNAMELEN;
uio->uio_iov = &iov;
uio->uio_offset = 0;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_resid = MAXNAMELEN;
uio->uio_iovcnt = 1;
VOP_READLINK(vp, uio, 0, NULL, error);
if (error) {
kfree(uio);
kfree(link);
return -error;
}
link[MAXNAMELEN - uio->uio_resid] = '\0';
kfree(uio);
/* vfs_follow_link returns (-) errors */
error = vfs_follow_link(nd, link);
kfree(link);
return error;
}
/*
* careful here - this function can get called recursively, so
* we need to be very careful about how much stack we use.
* uio is kmalloced for this reason...
*/
STATIC void *
linvfs_follow_link(
struct dentry *dentry,
struct nameidata *nd)
{
vnode_t *vp;
uio_t *uio;
iovec_t iov;
int error;
char *link;
ASSERT(dentry);
ASSERT(nd);
link = (char *)kmalloc(MAXPATHLEN+1, GFP_KERNEL);
if (!link) {
nd_set_link(nd, ERR_PTR(-ENOMEM));
return NULL;
}
uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
if (!uio) {
kfree(link);
nd_set_link(nd, ERR_PTR(-ENOMEM));
return NULL;
}
vp = LINVFS_GET_VP(dentry->d_inode);
iov.iov_base = link;
iov.iov_len = MAXPATHLEN;
uio->uio_iov = &iov;
uio->uio_offset = 0;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_resid = MAXPATHLEN;
uio->uio_iovcnt = 1;
VOP_READLINK(vp, uio, 0, NULL, error);
if (error) {
kfree(link);
link = ERR_PTR(-error);
} else {
link[MAXPATHLEN - uio->uio_resid] = '\0';
}
kfree(uio);
nd_set_link(nd, link);
return NULL;
}
STATIC int
xfs_readlink_by_handle(
xfs_mount_t *mp,
void __user *arg,
struct file *parfilp,
struct inode *parinode)
{
int error;
struct iovec aiov;
struct uio auio;
struct inode *inode;
xfs_fsop_handlereq_t hreq;
vnode_t *vp;
__u32 olen;
if (!capable(CAP_SYS_ADMIN))
return -XFS_ERROR(EPERM);
if (copy_from_user(&hreq, arg, sizeof(xfs_fsop_handlereq_t)))
return -XFS_ERROR(EFAULT);
error = xfs_vget_fsop_handlereq(mp, parinode, &hreq, &vp, &inode);
if (error)
return -error;
/* Restrict this handle operation to symlinks only. */
if (!S_ISLNK(inode->i_mode)) {
VN_RELE(vp);
return -XFS_ERROR(EINVAL);
}
if (copy_from_user(&olen, hreq.ohandlen, sizeof(__u32))) {
VN_RELE(vp);
return -XFS_ERROR(EFAULT);
}
aiov.iov_len = olen;
aiov.iov_base = hreq.ohandle;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_resid = olen;
VOP_READLINK(vp, &auio, IO_INVIS, NULL, error);
VN_RELE(vp);
return (olen - auio.uio_resid);
}
/*
* Read the contents of a symlink, allocate a path buffer out of the
* namei_oc and initialize the supplied nlcomponent with the result.
*
* If an error occurs no buffer will be allocated or returned in the nlc.
*/
int
nreadsymlink(struct nlookupdata *nd, struct nchandle *nch,
struct nlcomponent *nlc)
{
struct vnode *vp;
struct iovec aiov;
struct uio auio;
int linklen;
int error;
char *cp;
nlc->nlc_nameptr = NULL;
nlc->nlc_namelen = 0;
if (nch->ncp->nc_vp == NULL)
return(ENOENT);
if ((error = cache_vget(nch, nd->nl_cred, LK_SHARED, &vp)) != 0)
return(error);
cp = objcache_get(namei_oc, M_WAITOK);
aiov.iov_base = cp;
aiov.iov_len = MAXPATHLEN;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_td = nd->nl_td;
auio.uio_resid = MAXPATHLEN - 1;
error = VOP_READLINK(vp, &auio, nd->nl_cred);
if (error)
goto fail;
linklen = MAXPATHLEN - 1 - auio.uio_resid;
if (varsym_enable) {
linklen = varsymreplace(cp, linklen, MAXPATHLEN - 1);
if (linklen < 0) {
error = ENAMETOOLONG;
goto fail;
}
}
cp[linklen] = 0;
nlc->nlc_nameptr = cp;
nlc->nlc_namelen = linklen;
vput(vp);
return(0);
fail:
objcache_put(namei_oc, cp);
vput(vp);
return(error);
}
/*
* Does most of the work for readlink().
*
* Note, however, if you're implementing symlinks, that various
* other parts of the VFS layer are missing crucial elements of
* support for symlinks.
*/
int
vfs_readlink(char *path, struct uio *uio)
{
struct vnode *vn;
int result;
result = vfs_lookup(path, &vn);
if (result) {
return result;
}
result = VOP_READLINK(vn, uio);
VOP_DECREF(vn);
return result;
}
static int
unionfs_readlink(void *v)
{
struct vop_readlink_args *ap = v;
int error;
struct unionfs_node *unp;
struct vnode *vp;
UNIONFS_INTERNAL_DEBUG("unionfs_readlink: enter\n");
unp = VTOUNIONFS(ap->a_vp);
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
error = VOP_READLINK(vp, ap->a_uio, ap->a_cred);
UNIONFS_INTERNAL_DEBUG("unionfs_readlink: leave (%d)\n", error);
return (error);
}
int
pn_getsymlink(vnode_t *vp, struct pathname *pnp, cred_t *crp)
{
struct iovec aiov;
struct uio auio;
int error;
aiov.iov_base = pnp->pn_path = pnp->pn_buf;
aiov.iov_len = pnp->pn_bufsize;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_loffset = 0;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_extflg = UIO_COPY_CACHED;
auio.uio_resid = pnp->pn_bufsize;
if ((error = VOP_READLINK(vp, &auio, crp, NULL)) == 0) {
pnp->pn_pathlen = pnp->pn_bufsize - auio.uio_resid;
if (pnp->pn_pathlen == pnp->pn_bufsize)
error = ENAMETOOLONG;
else
pnp->pn_path[pnp->pn_pathlen] = '\0';
}
return (error);
}
extern int
vnode_iop_readlink(
DENT_T *dentry,
char * buf,
int buflen
)
{
INODE_T *ip;
struct uio uio;
iovec_t iov;
int err = 0;
CALL_DATA_T cd;
/*
* This routine is not called for shadow objects which need
* special handling; they're done in shadow_readlink.
*/
uio.uio_iov = &iov;
mdki_linux_uioset(&uio, buf, buflen, 0, UIO_USERSPACE);
mdki_linux_init_call_data(&cd);
ip = dentry->d_inode;
ASSERT_KERNEL_UNLOCKED();
ASSERT_I_SEM_NOT_MINE(ip);
err = VOP_READLINK(ITOV(ip), &uio, &cd);
err = mdki_errno_unix_to_linux(err);
mdki_linux_destroy_call_data(&cd);
if (err == 0) {
/* return count of bytes */
err = buflen - uio.uio_resid;
}
return(err);
}
/*
* Set up nameidata for a lookup() call and do it.
*
* If pubflag is set, this call is done for a lookup operation on the
* public filehandle. In that case we allow crossing mountpoints and
* absolute pathnames. However, the caller is expected to check that
* the lookup result is within the public fs, and deny access if
* it is not.
*
* nfs_namei() clears out garbage fields that namei() might leave garbage.
* This is mainly ni_vp and ni_dvp when an error occurs, and ni_dvp when no
* error occurs but the parent was not requested.
*
* dirp may be set whether an error is returned or not, and must be
* released by the caller.
*/
int
nfs_namei(struct nameidata *ndp, struct nfsrv_descript *nfsd,
fhandle_t *fhp, int len, struct nfssvc_sock *slp,
struct sockaddr *nam, struct mbuf **mdp,
caddr_t *dposp, struct vnode **retdirp, int v3, struct vattr *retdirattrp,
int *retdirattr_retp, int pubflag)
{
int i, rem;
struct mbuf *md;
char *fromcp, *tocp, *cp;
struct iovec aiov;
struct uio auio;
struct vnode *dp;
int error, rdonly, linklen;
struct componentname *cnp = &ndp->ni_cnd;
int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0;
*retdirp = NULL;
cnp->cn_flags |= NOMACCHECK;
cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
/*
* Copy the name from the mbuf list to ndp->ni_pnbuf
* and set the various ndp fields appropriately.
*/
fromcp = *dposp;
tocp = cnp->cn_pnbuf;
md = *mdp;
rem = mtod(md, caddr_t) + md->m_len - fromcp;
for (i = 0; i < len; i++) {
while (rem == 0) {
md = md->m_next;
if (md == NULL) {
error = EBADRPC;
goto out;
}
fromcp = mtod(md, caddr_t);
rem = md->m_len;
}
if (*fromcp == '\0' || (!pubflag && *fromcp == '/')) {
error = EACCES;
goto out;
}
*tocp++ = *fromcp++;
rem--;
}
*tocp = '\0';
*mdp = md;
*dposp = fromcp;
len = nfsm_rndup(len)-len;
if (len > 0) {
if (rem >= len)
*dposp += len;
else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
goto out;
}
if (!pubflag && nfs_ispublicfh(fhp))
return (ESTALE);
/*
* Extract and set starting directory.
*/
error = nfsrv_fhtovp(fhp, 0, &dp, nfsd, slp, nam, &rdonly);
if (error)
goto out;
if (dp->v_type != VDIR) {
vput(dp);
error = ENOTDIR;
goto out;
}
if (rdonly)
cnp->cn_flags |= RDONLY;
/*
* Set return directory. Reference to dp is implicitly transfered
* to the returned pointer
*/
*retdirp = dp;
if (v3) {
*retdirattr_retp = VOP_GETATTR(dp, retdirattrp,
ndp->ni_cnd.cn_cred);
}
VOP_UNLOCK(dp, 0);
if (pubflag) {
/*
* Oh joy. For WebNFS, handle those pesky '%' escapes,
* and the 'native path' indicator.
*/
cp = uma_zalloc(namei_zone, M_WAITOK);
fromcp = cnp->cn_pnbuf;
tocp = cp;
if ((unsigned char)*fromcp >= WEBNFS_SPECCHAR_START) {
switch ((unsigned char)*fromcp) {
case WEBNFS_NATIVE_CHAR:
/*
* 'Native' path for us is the same
* as a path according to the NFS spec,
* just skip the escape char.
*/
fromcp++;
break;
/*
* More may be added in the future, range 0x80-0xff
*/
default:
error = EIO;
uma_zfree(namei_zone, cp);
goto out;
}
}
/*
* Translate the '%' escapes, URL-style.
*/
while (*fromcp != '\0') {
if (*fromcp == WEBNFS_ESC_CHAR) {
if (fromcp[1] != '\0' && fromcp[2] != '\0') {
fromcp++;
*tocp++ = HEXSTRTOI(fromcp);
fromcp += 2;
continue;
} else {
error = ENOENT;
uma_zfree(namei_zone, cp);
goto out;
}
} else
*tocp++ = *fromcp++;
}
*tocp = '\0';
uma_zfree(namei_zone, cnp->cn_pnbuf);
cnp->cn_pnbuf = cp;
}
ndp->ni_pathlen = (tocp - cnp->cn_pnbuf) + 1;
ndp->ni_segflg = UIO_SYSSPACE;
if (pubflag) {
ndp->ni_rootdir = rootvnode;
ndp->ni_loopcnt = 0;
if (cnp->cn_pnbuf[0] == '/')
dp = rootvnode;
} else {
cnp->cn_flags |= NOCROSSMOUNT;
}
/*
* Initialize for scan, set ni_startdir and bump ref on dp again
* because lookup() will dereference ni_startdir.
*/
cnp->cn_thread = curthread;
VREF(dp);
ndp->ni_startdir = dp;
if (!lockleaf)
cnp->cn_flags |= LOCKLEAF;
for (;;) {
cnp->cn_nameptr = cnp->cn_pnbuf;
/*
* Call lookup() to do the real work. If an error occurs,
* ndp->ni_vp and ni_dvp are left uninitialized or NULL and
* we do not have to dereference anything before returning.
* In either case ni_startdir will be dereferenced and NULLed
* out.
*/
error = lookup(ndp);
if (error)
break;
/*
* Check for encountering a symbolic link. Trivial
* termination occurs if no symlink encountered.
* Note: zfree is safe because error is 0, so we will
* not zfree it again when we break.
*/
if ((cnp->cn_flags & ISSYMLINK) == 0) {
if (cnp->cn_flags & (SAVENAME | SAVESTART))
cnp->cn_flags |= HASBUF;
else
uma_zfree(namei_zone, cnp->cn_pnbuf);
if (ndp->ni_vp && !lockleaf)
VOP_UNLOCK(ndp->ni_vp, 0);
break;
}
/*
* Validate symlink
*/
if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
VOP_UNLOCK(ndp->ni_dvp, 0);
if (!pubflag) {
error = EINVAL;
goto badlink2;
}
if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
error = ELOOP;
goto badlink2;
}
if (ndp->ni_pathlen > 1)
cp = uma_zalloc(namei_zone, M_WAITOK);
else
cp = cnp->cn_pnbuf;
aiov.iov_base = cp;
aiov.iov_len = MAXPATHLEN;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_td = NULL;
auio.uio_resid = MAXPATHLEN;
error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
if (error) {
badlink1:
if (ndp->ni_pathlen > 1)
uma_zfree(namei_zone, cp);
badlink2:
vput(ndp->ni_vp);
vrele(ndp->ni_dvp);
break;
}
linklen = MAXPATHLEN - auio.uio_resid;
if (linklen == 0) {
error = ENOENT;
goto badlink1;
}
if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
error = ENAMETOOLONG;
goto badlink1;
}
/*
* Adjust or replace path
*/
if (ndp->ni_pathlen > 1) {
bcopy(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
uma_zfree(namei_zone, cnp->cn_pnbuf);
cnp->cn_pnbuf = cp;
} else
cnp->cn_pnbuf[linklen] = '\0';
ndp->ni_pathlen += linklen;
/*
* Cleanup refs for next loop and check if root directory
* should replace current directory. Normally ni_dvp
* becomes the new base directory and is cleaned up when
* we loop. Explicitly null pointers after invalidation
* to clarify operation.
*/
vput(ndp->ni_vp);
ndp->ni_vp = NULL;
if (cnp->cn_pnbuf[0] == '/') {
vrele(ndp->ni_dvp);
ndp->ni_dvp = ndp->ni_rootdir;
VREF(ndp->ni_dvp);
}
ndp->ni_startdir = ndp->ni_dvp;
ndp->ni_dvp = NULL;
}
if (!lockleaf)
cnp->cn_flags &= ~LOCKLEAF;
/*
* nfs_namei() guarentees that fields will not contain garbage
* whether an error occurs or not. This allows the caller to track
* cleanup state trivially.
*/
out:
if (error) {
uma_zfree(namei_zone, cnp->cn_pnbuf);
ndp->ni_vp = NULL;
ndp->ni_dvp = NULL;
ndp->ni_startdir = NULL;
cnp->cn_flags &= ~HASBUF;
} else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
ndp->ni_dvp = NULL;
}
return (error);
}
/*
* Convert a pathname into a pointer to a vnode.
*
* The FOLLOW flag is set when symbolic links are to be followed
* when they occur at the end of the name translation process.
* Symbolic links are always followed for all other pathname
* components other than the last.
*
* If the LOCKLEAF flag is set, a locked vnode is returned.
*
* The segflg defines whether the name is to be copied from user
* space or kernel space.
*
* Overall outline of namei:
*
* copy in name
* get starting directory
* while (!done && !error) {
* call lookup to search path.
* if symbolic link, massage name in buffer and continue
* }
*/
int
namei(struct nameidata *ndp)
{
struct filedesc *fdp; /* pointer to file descriptor state */
char *cp; /* pointer into pathname argument */
struct vnode *dp; /* the directory we are searching */
struct iovec aiov; /* uio for reading symbolic links */
struct uio auio;
int error, linklen;
struct componentname *cnp = &ndp->ni_cnd;
struct proc *p = cnp->cn_proc;
ndp->ni_cnd.cn_cred = ndp->ni_cnd.cn_proc->p_ucred;
#ifdef DIAGNOSTIC
if (!cnp->cn_cred || !cnp->cn_proc)
panic ("namei: bad cred/proc");
if (cnp->cn_nameiop & (~OPMASK))
panic ("namei: nameiop contaminated with flags");
if (cnp->cn_flags & OPMASK)
panic ("namei: flags contaminated with nameiops");
#endif
fdp = cnp->cn_proc->p_fd;
/*
* Get a buffer for the name to be translated, and copy the
* name into the buffer.
*/
if ((cnp->cn_flags & HASBUF) == 0)
cnp->cn_pnbuf = pool_get(&namei_pool, PR_WAITOK);
if (ndp->ni_segflg == UIO_SYSSPACE)
error = copystr(ndp->ni_dirp, cnp->cn_pnbuf,
MAXPATHLEN, &ndp->ni_pathlen);
else
error = copyinstr(ndp->ni_dirp, cnp->cn_pnbuf,
MAXPATHLEN, &ndp->ni_pathlen);
/*
* Fail on null pathnames
*/
if (error == 0 && ndp->ni_pathlen == 1)
error = ENOENT;
if (error) {
pool_put(&namei_pool, cnp->cn_pnbuf);
ndp->ni_vp = NULL;
return (error);
}
#ifdef KTRACE
if (KTRPOINT(cnp->cn_proc, KTR_NAMEI))
ktrnamei(cnp->cn_proc, cnp->cn_pnbuf);
#endif
#if NSYSTRACE > 0
if (ISSET(cnp->cn_proc->p_flag, P_SYSTRACE))
systrace_namei(ndp);
#endif
/*
* Strip trailing slashes, as requested
*/
if (cnp->cn_flags & STRIPSLASHES) {
char *end = cnp->cn_pnbuf + ndp->ni_pathlen - 2;
cp = end;
while (cp >= cnp->cn_pnbuf && (*cp == '/'))
cp--;
/* Still some remaining characters in the buffer */
if (cp >= cnp->cn_pnbuf) {
ndp->ni_pathlen -= (end - cp);
*(cp + 1) = '\0';
}
}
ndp->ni_loopcnt = 0;
/*
* Get starting point for the translation.
*/
if ((ndp->ni_rootdir = fdp->fd_rdir) == NULL)
ndp->ni_rootdir = rootvnode;
/*
* Check if starting from root directory or current directory.
*/
if (cnp->cn_pnbuf[0] == '/') {
dp = ndp->ni_rootdir;
vref(dp);
} else {
dp = fdp->fd_cdir;
vref(dp);
}
for (;;) {
if (!dp->v_mount) {
/* Give up if the directory is no longer mounted */
pool_put(&namei_pool, cnp->cn_pnbuf);
return (ENOENT);
}
cnp->cn_nameptr = cnp->cn_pnbuf;
ndp->ni_startdir = dp;
if ((error = lookup(ndp)) != 0) {
pool_put(&namei_pool, cnp->cn_pnbuf);
return (error);
}
/*
* If not a symbolic link, return search result.
*/
if ((cnp->cn_flags & ISSYMLINK) == 0) {
if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
pool_put(&namei_pool, cnp->cn_pnbuf);
else
cnp->cn_flags |= HASBUF;
return (0);
}
if ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))
VOP_UNLOCK(ndp->ni_dvp, 0, p);
if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
error = ELOOP;
break;
}
if (ndp->ni_pathlen > 1)
cp = pool_get(&namei_pool, PR_WAITOK);
else
cp = cnp->cn_pnbuf;
aiov.iov_base = cp;
aiov.iov_len = MAXPATHLEN;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = cnp->cn_proc;
auio.uio_resid = MAXPATHLEN;
error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
if (error) {
badlink:
if (ndp->ni_pathlen > 1)
pool_put(&namei_pool, cp);
break;
}
linklen = MAXPATHLEN - auio.uio_resid;
if (linklen == 0) {
error = ENOENT;
goto badlink;
}
if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
error = ENAMETOOLONG;
goto badlink;
}
if (ndp->ni_pathlen > 1) {
bcopy(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
pool_put(&namei_pool, cnp->cn_pnbuf);
cnp->cn_pnbuf = cp;
} else
cnp->cn_pnbuf[linklen] = '\0';
ndp->ni_pathlen += linklen;
vput(ndp->ni_vp);
dp = ndp->ni_dvp;
/*
* Check if root directory should replace current directory.
*/
if (cnp->cn_pnbuf[0] == '/') {
vrele(dp);
dp = ndp->ni_rootdir;
vref(dp);
}
}
pool_put(&namei_pool, cnp->cn_pnbuf);
vrele(ndp->ni_dvp);
vput(ndp->ni_vp);
ndp->ni_vp = NULL;
return (error);
}
int
fscache_name_to_fsid(cachefscache_t *cachep, char *namep, ino64_t *fsidp)
{
int error;
char dirname[CFS_FRONTFILE_NAME_SIZE];
vnode_t *linkvp = NULL;
struct uio uio;
struct iovec iov;
ino64_t nodeid;
char *pd;
int xx;
int c;
/* get the vnode of the name */
error = VOP_LOOKUP(cachep->c_dirvp, namep, &linkvp, NULL, 0, NULL,
kcred, NULL, NULL, NULL);
if (error)
goto out;
/* the vnode had better be a link */
if (linkvp->v_type != VLNK) {
error = EINVAL;
goto out;
}
/* read the contents of the link */
iov.iov_len = CFS_FRONTFILE_NAME_SIZE;
iov.iov_base = dirname;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_resid = iov.iov_len;
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_loffset = 0;
uio.uio_fmode = 0;
uio.uio_extflg = UIO_COPY_CACHED;
error = VOP_READLINK(linkvp, &uio, kcred, NULL);
if (error) {
cmn_err(CE_WARN, "cachefs: Can't read filesystem cache link");
goto out;
}
/* convert the contents of the link to a ino64_t */
nodeid = 0;
pd = dirname;
for (xx = 0; xx < (CFS_FRONTFILE_NAME_SIZE - 2); xx++) {
nodeid <<= 4;
c = *pd++;
if (c <= '9')
c -= '0';
else if (c <= 'F')
c = c - 'A' + 10;
else
c = c - 'a' + 10;
nodeid += c;
}
*fsidp = nodeid;
out:
if (linkvp)
VN_RELE(linkvp);
return (error);
}
