/*===========================================================================*
* do_mount *
*===========================================================================*/
PUBLIC int do_mount()
{
/* Perform the mount(name, mfile, mount_flags) system call. */
endpoint_t fs_e;
int r, slot, rdonly, nodev;
char fullpath[PATH_MAX];
char mount_label[LABEL_MAX];
dev_t dev;
/* Only the super-user may do MOUNT. */
if (!super_user) return(EPERM);
/* FS process' endpoint number */
if (m_in.mount_flags & MS_LABEL16) {
/* Get the label from the caller, and ask DS for the endpoint. */
r = sys_datacopy(who_e, (vir_bytes) m_in.fs_label, SELF,
(vir_bytes) mount_label, (phys_bytes) sizeof(mount_label));
if (r != OK) return(r);
mount_label[sizeof(mount_label)-1] = 0;
r = ds_retrieve_label_endpt(mount_label, &fs_e);
if (r != OK) return(r);
} else {
/* Legacy support: get the endpoint from the request itself. */
fs_e = (endpoint_t) m_in.fs_label;
mount_label[0] = 0;
}
/* Sanity check on process number. */
if (isokendpt(fs_e, &slot) != OK) return(EINVAL);
/* Should the file system be mounted read-only? */
rdonly = (m_in.mount_flags & MS_RDONLY);
/* A null string for block special device means don't use a device at all. */
nodev = (m_in.name1_length == 0);
if (!nodev) {
/* If 'name' is not for a block special file, return error. */
if (fetch_name(m_in.name1, m_in.name1_length, M1, fullpath) != OK)
return(err_code);
if ((dev = name_to_dev(FALSE /*allow_mountpt*/, fullpath)) == NO_DEV)
return(err_code);
} else {
/* Find a free pseudo-device as substitute for an actual device. */
if ((dev = find_free_nonedev()) == NO_DEV)
return(err_code);
}
/* Fetch the name of the mountpoint */
if (fetch_name(m_in.name2, m_in.name2_length, M1, fullpath) != OK)
return(err_code);
/* Do the actual job */
return mount_fs(dev, fullpath, fs_e, rdonly, mount_label);
}
/*===========================================================================*
* mount_pfs *
*===========================================================================*/
void mount_pfs(void)
{
/* Mount the Pipe File Server. It's not really mounted onto the file system,
but it's necessary it has a vmnt entry to make locking easier */
dev_t dev;
struct vmnt *vmp;
struct fproc *rfp;
if ((dev = find_free_nonedev()) == NO_DEV)
panic("VFS: no nonedev to initialize PFS");
if ((vmp = get_free_vmnt()) == NULL)
panic("VFS: no vmnt to initialize PFS");
alloc_nonedev(dev);
vmp->m_dev = dev;
vmp->m_fs_e = PFS_PROC_NR;
strlcpy(vmp->m_label, "pfs", LABEL_MAX);
rfp = &fproc[_ENDPOINT_P(PFS_PROC_NR)];
}
