/* Remove registration of a filesystem type */
static int
vfs_unregister(struct vfsconf *vfc)
{
struct vfsconf *vfsp;
int error, i, maxtypenum;
i = vfc->vfc_typenum;
vfsp = vfs_byname(vfc->vfc_name);
if (vfsp == NULL)
return EINVAL;
if (vfsp->vfc_refcount)
return EBUSY;
if (vfc->vfc_vfsops->vfs_uninit != NULL) {
error = (*vfc->vfc_vfsops->vfs_uninit)(vfsp);
if (error)
return (error);
}
TAILQ_REMOVE(&vfsconf, vfsp, vfc_list);
maxtypenum = VFS_GENERIC;
TAILQ_FOREACH(vfsp, &vfsconf, vfc_list)
if (maxtypenum < vfsp->vfc_typenum)
maxtypenum = vfsp->vfc_typenum;
maxvfsconf = maxtypenum + 1;
return 0;
}
struct vfsconf *
vfs_byname_kld(const char *fstype, struct thread *td, int *error)
{
struct vfsconf *vfsp;
int fileid;
vfsp = vfs_byname(fstype);
if (vfsp != NULL)
return (vfsp);
/* Try to load the respective module. */
*error = kern_kldload(td, fstype, &fileid);
if (*error)
return (NULL);
/* Look up again to see if the VFS was loaded. */
vfsp = vfs_byname(fstype);
if (vfsp == NULL) {
(void)kern_kldunload(td, fileid, LINKER_UNLOAD_FORCE);
*error = ENODEV;
return (NULL);
}
return (vfsp);
}
static int
vfs_mountroot_devfs(struct thread *td, struct mount **mpp)
{
struct vfsoptlist *opts;
struct vfsconf *vfsp;
struct mount *mp;
int error;
*mpp = NULL;
vfsp = vfs_byname("devfs");
KASSERT(vfsp != NULL, ("Could not find devfs by name"));
if (vfsp == NULL)
return (ENOENT);
mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred);
error = VFS_MOUNT(mp);
KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error));
if (error)
return (error);
opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
TAILQ_INIT(opts);
mp->mnt_opt = opts;
mtx_lock(&mountlist_mtx);
TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list);
mtx_unlock(&mountlist_mtx);
*mpp = mp;
rootdevmp = mp;
set_rootvnode();
error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE);
if (error)
printf("kern_symlink /dev -> / returns %d\n", error);
return (error);
}
static int
parse_mount(char **conf)
{
char *errmsg;
struct mntarg *ma;
char *dev, *fs, *opts, *tok;
int delay, error, timeout;
error = parse_token(conf, &tok);
if (error)
return (error);
fs = tok;
error = parse_skipto(&tok, ':');
if (error) {
free(fs, M_TEMP);
return (error);
}
parse_poke(&tok, '\0');
parse_advance(&tok);
dev = tok;
if (root_mount_mddev != -1) {
/* Handle substitution for the md unit number. */
tok = strstr(dev, "md#");
if (tok != NULL)
tok[2] = '0' + root_mount_mddev;
}
/* Parse options. */
error = parse_token(conf, &tok);
opts = (error == 0) ? tok : NULL;
printf("Trying to mount root from %s:%s [%s]...\n", fs, dev,
(opts != NULL) ? opts : "");
errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO);
if (vfs_byname(fs) == NULL) {
strlcpy(errmsg, "unknown file system", ERRMSGL);
error = ENOENT;
goto out;
}
if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL &&
dev[0] != '\0' && !parse_mount_dev_present(dev)) {
printf("mountroot: waiting for device %s ...\n", dev);
delay = hz / 10;
timeout = root_mount_timeout * hz;
do {
pause("rmdev", delay);
timeout -= delay;
} while (timeout > 0 && !parse_mount_dev_present(dev));
if (timeout <= 0) {
error = ENODEV;
goto out;
}
}
ma = NULL;
ma = mount_arg(ma, "fstype", fs, -1);
ma = mount_arg(ma, "fspath", "/", -1);
ma = mount_arg(ma, "from", dev, -1);
ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL);
ma = mount_arg(ma, "ro", NULL, 0);
ma = parse_mountroot_options(ma, opts);
error = kernel_mount(ma, MNT_ROOTFS);
out:
if (error) {
printf("Mounting from %s:%s failed with error %d",
fs, dev, error);
if (errmsg[0] != '\0')
printf(": %s", errmsg);
printf(".\n");
}
free(fs, M_TEMP);
free(errmsg, M_TEMP);
if (opts != NULL)
free(opts, M_TEMP);
/* kernel_mount can return -1 on error. */
return ((error < 0) ? EDOOFUS : error);
}
/* Register a new filesystem type in the global table */
static int
vfs_register(struct vfsconf *vfc)
{
struct sysctl_oid *oidp;
struct vfsops *vfsops;
static int once;
if (!once) {
vattr_null(&va_null);
once = 1;
}
if (vfc->vfc_version != VFS_VERSION) {
printf("ERROR: filesystem %s, unsupported ABI version %x\n",
vfc->vfc_name, vfc->vfc_version);
return (EINVAL);
}
if (vfs_byname(vfc->vfc_name) != NULL)
return EEXIST;
vfc->vfc_typenum = maxvfsconf++;
TAILQ_INSERT_TAIL(&vfsconf, vfc, vfc_list);
/*
* If this filesystem has a sysctl node under vfs
* (i.e. vfs.xxfs), then change the oid number of that node to
* match the filesystem's type number. This allows user code
* which uses the type number to read sysctl variables defined
* by the filesystem to continue working. Since the oids are
* in a sorted list, we need to make sure the order is
* preserved by re-registering the oid after modifying its
* number.
*/
sysctl_lock();
SLIST_FOREACH(oidp, &sysctl__vfs_children, oid_link)
if (strcmp(oidp->oid_name, vfc->vfc_name) == 0) {
sysctl_unregister_oid(oidp);
oidp->oid_number = vfc->vfc_typenum;
sysctl_register_oid(oidp);
break;
}
sysctl_unlock();
/*
* Initialise unused ``struct vfsops'' fields, to use
* the vfs_std*() functions. Note, we need the mount
* and unmount operations, at the least. The check
* for vfsops available is just a debugging aid.
*/
KASSERT(vfc->vfc_vfsops != NULL,
("Filesystem %s has no vfsops", vfc->vfc_name));
/*
* Check the mount and unmount operations.
*/
vfsops = vfc->vfc_vfsops;
KASSERT(vfsops->vfs_mount != NULL,
("Filesystem %s has no mount op", vfc->vfc_name));
KASSERT(vfsops->vfs_unmount != NULL,
("Filesystem %s has no unmount op", vfc->vfc_name));
if (vfsops->vfs_root == NULL)
/* return file system's root vnode */
vfsops->vfs_root = vfs_stdroot;
if (vfsops->vfs_quotactl == NULL)
/* quota control */
vfsops->vfs_quotactl = vfs_stdquotactl;
if (vfsops->vfs_statfs == NULL)
/* return file system's status */
vfsops->vfs_statfs = vfs_stdstatfs;
if (vfsops->vfs_sync == NULL)
/*
* flush unwritten data (nosync)
* file systems can use vfs_stdsync
* explicitly by setting it in the
* vfsop vector.
*/
vfsops->vfs_sync = vfs_stdnosync;
if (vfsops->vfs_vget == NULL)
/* convert an inode number to a vnode */
vfsops->vfs_vget = vfs_stdvget;
if (vfsops->vfs_fhtovp == NULL)
/* turn an NFS file handle into a vnode */
vfsops->vfs_fhtovp = vfs_stdfhtovp;
if (vfsops->vfs_checkexp == NULL)
/* check if file system is exported */
vfsops->vfs_checkexp = vfs_stdcheckexp;
if (vfsops->vfs_init == NULL)
/* file system specific initialisation */
vfsops->vfs_init = vfs_stdinit;
if (vfsops->vfs_uninit == NULL)
/* file system specific uninitialisation */
vfsops->vfs_uninit = vfs_stduninit;
if (vfsops->vfs_extattrctl == NULL)
/* extended attribute control */
vfsops->vfs_extattrctl = vfs_stdextattrctl;
if (vfsops->vfs_sysctl == NULL)
vfsops->vfs_sysctl = vfs_stdsysctl;
/*
* Call init function for this VFS...
*/
(*(vfc->vfc_vfsops->vfs_init))(vfc);
return 0;
}
