/*
* wput(9E) is symmetric for master and slave sides, so this handles both
* without splitting the codepath. (The only exception to this is the
* processing of zcons ioctls, which is restricted to the master side.)
*
* zc_wput() looks at the other side; if there is no process holding that
* side open, it frees the message. This prevents processes from hanging
* if no one is holding open the console. Otherwise, it putnext's high
* priority messages, putnext's normal messages if possible, and otherwise
* enqueues the messages; in the case that something is enqueued, wsrv(9E)
* will take care of eventually shuttling I/O to the other side.
*/
static void
zc_wput(queue_t *qp, mblk_t *mp)
{
unsigned char type = mp->b_datap->db_type;
zc_state_t *zcs;
struct iocblk *iocbp;
file_t *slave_filep;
struct snode *slave_snodep;
int slave_fd;
ASSERT(qp->q_ptr);
DBG1("entering zc_wput, %s side", zc_side(qp));
/*
* Process zcons ioctl messages if qp is the master console's write
* queue.
*/
zcs = (zc_state_t *)qp->q_ptr;
if (zcs->zc_master_rdq != NULL && qp == WR(zcs->zc_master_rdq) &&
type == M_IOCTL) {
iocbp = (struct iocblk *)(void *)mp->b_rptr;
switch (iocbp->ioc_cmd) {
case ZC_HOLDSLAVE:
/*
* Hold the slave's vnode and increment the refcount
* of the snode. If the vnode is already held, then
* indicate success.
*/
if (iocbp->ioc_count != TRANSPARENT) {
miocack(qp, mp, 0, EINVAL);
return;
}
if (zcs->zc_slave_vnode != NULL) {
miocack(qp, mp, 0, 0);
return;
}
/*
* The process that passed the ioctl must be running in
* the global zone.
*/
if (curzone != global_zone) {
miocack(qp, mp, 0, EINVAL);
return;
}
/*
* The calling process must pass a file descriptor for
* the slave device.
*/
slave_fd =
(int)(intptr_t)*(caddr_t *)(void *)mp->b_cont->
b_rptr;
slave_filep = getf(slave_fd);
if (slave_filep == NULL) {
miocack(qp, mp, 0, EINVAL);
return;
}
if (ZC_STATE_TO_SLAVEDEV(zcs) !=
slave_filep->f_vnode->v_rdev) {
releasef(slave_fd);
miocack(qp, mp, 0, EINVAL);
return;
}
/*
* Get a reference to the slave's vnode. Also bump the
* reference count on the associated snode.
*/
ASSERT(vn_matchops(slave_filep->f_vnode,
spec_getvnodeops()));
zcs->zc_slave_vnode = slave_filep->f_vnode;
VN_HOLD(zcs->zc_slave_vnode);
slave_snodep = VTOCS(zcs->zc_slave_vnode);
mutex_enter(&slave_snodep->s_lock);
++slave_snodep->s_count;
mutex_exit(&slave_snodep->s_lock);
releasef(slave_fd);
miocack(qp, mp, 0, 0);
return;
case ZC_RELEASESLAVE:
/*
* Release the master's handle on the slave's vnode.
* If there isn't a handle for the vnode, then indicate
* success.
*/
if (iocbp->ioc_count != TRANSPARENT) {
miocack(qp, mp, 0, EINVAL);
return;
}
if (zcs->zc_slave_vnode == NULL) {
miocack(qp, mp, 0, 0);
return;
}
/*
* The process that passed the ioctl must be running in
* the global zone.
*/
if (curzone != global_zone) {
miocack(qp, mp, 0, EINVAL);
return;
}
/*
* The process that passed the ioctl must have provided
* a file descriptor for the slave device. Make sure
* this is correct.
*/
slave_fd =
(int)(intptr_t)*(caddr_t *)(void *)mp->b_cont->
b_rptr;
slave_filep = getf(slave_fd);
if (slave_filep == NULL) {
miocack(qp, mp, 0, EINVAL);
return;
}
if (zcs->zc_slave_vnode->v_rdev !=
slave_filep->f_vnode->v_rdev) {
releasef(slave_fd);
miocack(qp, mp, 0, EINVAL);
return;
}
/*
* Decrement the snode's reference count and release the
* vnode.
*/
ASSERT(vn_matchops(slave_filep->f_vnode,
spec_getvnodeops()));
slave_snodep = VTOCS(zcs->zc_slave_vnode);
mutex_enter(&slave_snodep->s_lock);
--slave_snodep->s_count;
mutex_exit(&slave_snodep->s_lock);
VN_RELE(zcs->zc_slave_vnode);
zcs->zc_slave_vnode = NULL;
releasef(slave_fd);
miocack(qp, mp, 0, 0);
return;
default:
break;
}
}
if (zc_switch(RD(qp)) == NULL) {
DBG1("wput to %s side (no one listening)", zc_side(qp));
switch (type) {
case M_FLUSH:
handle_mflush(qp, mp);
break;
case M_IOCTL:
miocnak(qp, mp, 0, 0);
break;
default:
freemsg(mp);
break;
}
return;
}
if (type >= QPCTL) {
DBG1("(hipri) wput, %s side", zc_side(qp));
switch (type) {
case M_READ: /* supposedly from ldterm? */
DBG("zc_wput: tossing M_READ\n");
freemsg(mp);
break;
case M_FLUSH:
handle_mflush(qp, mp);
break;
default:
/*
* Put this to the other side.
*/
ASSERT(zc_switch(RD(qp)) != NULL);
putnext(zc_switch(RD(qp)), mp);
break;
}
DBG1("done (hipri) wput, %s side", zc_side(qp));
return;
}
/*
* Only putnext if there isn't already something in the queue.
* otherwise things would wind up out of order.
*/
if (qp->q_first == NULL && bcanputnext(RD(zc_switch(qp)), mp->b_band)) {
DBG("wput: putting message to other side\n");
putnext(RD(zc_switch(qp)), mp);
} else {
DBG("wput: putting msg onto queue\n");
(void) putq(qp, mp);
}
DBG1("done wput, %s side", zc_side(qp));
}
/*
* Mount a file descriptor onto the node in the file system.
* Create a new vnode, update the attributes with info from the
* file descriptor and the mount point. The mask, mode, uid, gid,
* atime, mtime and ctime are taken from the mountpt. Link count is
* set to one, the file system id is namedev and nodeid is unique
* for each mounted object. Other attributes are taken from mount point.
* Make sure user is owner (or root) with write permissions on mount point.
* Hash the new vnode and return 0.
* Upon entry to this routine, the file descriptor is in the
* fd field of a struct namefd. Copy that structure from user
* space and retrieve the file descriptor.
*/
static int
nm_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *crp)
{
struct namefd namefdp;
struct vnode *filevp; /* file descriptor vnode */
struct file *fp;
struct vnode *newvp; /* vnode representing this mount */
struct vnode *rvp; /* realvp (if any) for the mountpt */
struct namenode *nodep; /* namenode for this mount */
struct vattr filevattr; /* attributes of file dec. */
struct vattr *vattrp; /* attributes of this mount */
char *resource_name;
char *resource_nodetype;
statvfs64_t *svfsp;
int error = 0;
/*
* Get the file descriptor from user space.
* Make sure the file descriptor is valid and has an
* associated file pointer.
* If so, extract the vnode from the file pointer.
*/
if (uap->datalen != sizeof (struct namefd))
return (EINVAL);
if (copyin(uap->dataptr, &namefdp, uap->datalen))
return (EFAULT);
if ((fp = getf(namefdp.fd)) == NULL)
return (EBADF);
/*
* If the mount point already has something mounted
* on it, disallow this mount. (This restriction may
* be removed in a later release).
* Or unmount has completed but the namefs ROOT vnode
* count has not decremented to zero, disallow this mount.
*/
mutex_enter(&mvp->v_lock);
if ((mvp->v_flag & VROOT) ||
vfs_matchops(mvp->v_vfsp, namefs_vfsops)) {
mutex_exit(&mvp->v_lock);
releasef(namefdp.fd);
return (EBUSY);
}
mutex_exit(&mvp->v_lock);
/*
* Cannot allow users to fattach() in /dev/pts.
* First, there is no need for doing so and secondly
* we cannot allow arbitrary users to park on a node in
* /dev/pts or /dev/vt.
*/
rvp = NULLVP;
if (vn_matchops(mvp, spec_getvnodeops()) &&
VOP_REALVP(mvp, &rvp, NULL) == 0 && rvp &&
(vn_matchops(rvp, devpts_getvnodeops()) ||
vn_matchops(rvp, devvt_getvnodeops()))) {
releasef(namefdp.fd);
return (ENOTSUP);
}
filevp = fp->f_vnode;
if (filevp->v_type == VDIR || filevp->v_type == VPORT) {
releasef(namefdp.fd);
return (EINVAL);
}
/*
* If the fd being mounted refers to neither a door nor a stream,
* make sure the caller is privileged.
*/
if (filevp->v_type != VDOOR && filevp->v_stream == NULL) {
if (secpolicy_fs_mount(crp, filevp, vfsp) != 0) {
/* fd is neither a stream nor a door */
releasef(namefdp.fd);
return (EINVAL);
}
}
/*
* Make sure the file descriptor is not the root of some
* file system.
* If it's not, create a reference and allocate a namenode
* to represent this mount request.
*/
if (filevp->v_flag & VROOT) {
releasef(namefdp.fd);
return (EBUSY);
}
nodep = kmem_zalloc(sizeof (struct namenode), KM_SLEEP);
mutex_init(&nodep->nm_lock, NULL, MUTEX_DEFAULT, NULL);
vattrp = &nodep->nm_vattr;
vattrp->va_mask = AT_ALL;
if (error = VOP_GETATTR(mvp, vattrp, 0, crp, NULL))
goto out;
filevattr.va_mask = AT_ALL;
if (error = VOP_GETATTR(filevp, &filevattr, 0, crp, NULL))
goto out;
/*
* Make sure the user is the owner of the mount point
* or has sufficient privileges.
*/
if (error = secpolicy_vnode_owner(crp, vattrp->va_uid))
goto out;
/*
* Make sure the user has write permissions on the
* mount point (or has sufficient privileges).
*/
if (!(vattrp->va_mode & VWRITE) &&
secpolicy_vnode_access(crp, mvp, vattrp->va_uid, VWRITE) != 0) {
error = EACCES;
goto out;
}
/*
* If the file descriptor has file/record locking, don't
* allow the mount to succeed.
*/
if (vn_has_flocks(filevp)) {
error = EACCES;
goto out;
}
/*
* Initialize the namenode.
*/
if (filevp->v_stream) {
struct stdata *stp = filevp->v_stream;
mutex_enter(&stp->sd_lock);
stp->sd_flag |= STRMOUNT;
mutex_exit(&stp->sd_lock);
}
nodep->nm_filevp = filevp;
mutex_enter(&fp->f_tlock);
fp->f_count++;
mutex_exit(&fp->f_tlock);
releasef(namefdp.fd);
nodep->nm_filep = fp;
nodep->nm_mountpt = mvp;
/*
* The attributes for the mounted file descriptor were initialized
* above by applying VOP_GETATTR to the mount point. Some of
* the fields of the attributes structure will be overwritten
* by the attributes from the file descriptor.
*/
vattrp->va_type = filevattr.va_type;
vattrp->va_fsid = namedev;
vattrp->va_nodeid = namenodeno_alloc();
vattrp->va_nlink = 1;
vattrp->va_size = filevattr.va_size;
vattrp->va_rdev = filevattr.va_rdev;
vattrp->va_blksize = filevattr.va_blksize;
vattrp->va_nblocks = filevattr.va_nblocks;
vattrp->va_seq = 0;
/*
* Initialize new vnode structure for the mounted file descriptor.
*/
nodep->nm_vnode = vn_alloc(KM_SLEEP);
newvp = NMTOV(nodep);
newvp->v_flag = filevp->v_flag | VROOT | VNOMAP | VNOSWAP;
vn_setops(newvp, nm_vnodeops);
newvp->v_vfsp = vfsp;
newvp->v_stream = filevp->v_stream;
newvp->v_type = filevp->v_type;
newvp->v_rdev = filevp->v_rdev;
newvp->v_data = (caddr_t)nodep;
VFS_HOLD(vfsp);
vn_exists(newvp);
/*
* Initialize the vfs structure.
*/
vfsp->vfs_vnodecovered = NULL;
vfsp->vfs_flag |= VFS_UNLINKABLE;
vfsp->vfs_bsize = 1024;
vfsp->vfs_fstype = namefstype;
vfs_make_fsid(&vfsp->vfs_fsid, namedev, namefstype);
vfsp->vfs_data = (caddr_t)nodep;
vfsp->vfs_dev = namedev;
vfsp->vfs_bcount = 0;
/*
* Set the name we mounted from.
*/
switch (filevp->v_type) {
case VPROC: /* VOP_GETATTR() translates this to VREG */
case VREG: resource_nodetype = "file"; break;
case VDIR: resource_nodetype = "directory"; break;
case VBLK: resource_nodetype = "device"; break;
case VCHR: resource_nodetype = "device"; break;
case VLNK: resource_nodetype = "link"; break;
case VFIFO: resource_nodetype = "fifo"; break;
case VDOOR: resource_nodetype = "door"; break;
case VSOCK: resource_nodetype = "socket"; break;
default: resource_nodetype = "resource"; break;
}
#define RESOURCE_NAME_SZ 128 /* Maximum length of the resource name */
resource_name = kmem_alloc(RESOURCE_NAME_SZ, KM_SLEEP);
svfsp = kmem_alloc(sizeof (statvfs64_t), KM_SLEEP);
error = VFS_STATVFS(filevp->v_vfsp, svfsp);
if (error == 0) {
(void) snprintf(resource_name, RESOURCE_NAME_SZ,
"unspecified_%s_%s", svfsp->f_basetype, resource_nodetype);
} else {
(void) snprintf(resource_name, RESOURCE_NAME_SZ,
"unspecified_%s", resource_nodetype);
}
vfs_setresource(vfsp, resource_name);
kmem_free(svfsp, sizeof (statvfs64_t));
kmem_free(resource_name, RESOURCE_NAME_SZ);
#undef RESOURCE_NAME_SZ
/*
* Insert the namenode.
*/
mutex_enter(&ntable_lock);
nameinsert(nodep);
mutex_exit(&ntable_lock);
return (0);
out:
releasef(namefdp.fd);
kmem_free(nodep, sizeof (struct namenode));
return (error);
}
