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/*
* Written by Julian Elischer (julian@DIALix.oz.au)
*
* $Header: /home/ncvs/src/sys/miscfs/devfs/devfs_vfsops.c,v 1.13 1996/06/15 20:37:22 gpalmer Exp $
*
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/malloc.h>
#include <miscfs/devfs/devfsdefs.h>
#include <miscfs/specfs/specdev.h> /* defines v_rdev */
static int devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p);
static int mountdevfs( struct mount *mp, struct proc *p);
static int
devfs_init(void)
{
/*
* fill in the missing members on the "hidden" mount
*/
dev_root->dnp->dvm->mount->mnt_op = vfssw[MOUNT_DEVFS];
dev_root->dnp->dvm->mount->mnt_vfc = vfsconf[MOUNT_DEVFS];
/* Mark a reference for the "invisible" blueprint mount */
dev_root->dnp->dvm->mount->mnt_vfc->vfc_refcount++;
printf("DEVFS: ready to run\n");
return 0; /*XXX*/
}
/*
* mp - pointer to 'mount' structure
* path - addr in user space of mount point (ie /usr or whatever)
* data - addr in user space of mount params including the
* name of the block special file to treat as a filesystem.
* ndp - namei data pointer
* p - proc pointer
* devfs is special in that it doesn't require any device to be mounted..
* It makes up it's data as it goes along.
* it must be mounted during single user.. until it is, only std{in/out/err}
* and the root filesystem are available.
*/
/*proto*/
int
devfs_mount(struct mount *mp, char *path, caddr_t data,
struct nameidata *ndp, struct proc *p)
{
struct devfsmount *devfs_mp_p; /* devfs specific mount control block */
int error;
u_int size;
DBPRINT(("mount "));
/*
* If they just want to update, we don't need to do anything.
*/
if (mp->mnt_flag & MNT_UPDATE)
{
return 0;
}
/*
* Well, it's not an update, it's a real mount request.
* Time to get dirty.
* HERE we should check to see if we are already mounted here.
*/
if(error = mountdevfs( mp, p))
return (error);
/*
* Copy in the name of the directory the filesystem
* is to be mounted on.
* And we clear the remainder of the character strings
* to be tidy.
* Then, we try to fill in the filesystem stats structure
* as best we can with whatever we can think of at the time
*/
devfs_mp_p = (struct devfsmount *)mp->mnt_data;
if(devfs_up_and_going) {
copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname,
sizeof(mp->mnt_stat.f_mntonname)-1, &size);
bzero(mp->mnt_stat.f_mntonname + size,
sizeof(mp->mnt_stat.f_mntonname) - size);
} else {
bcopy("dummy_mount", (caddr_t)mp->mnt_stat.f_mntonname,12);
}
bzero(mp->mnt_stat.f_mntfromname , MNAMELEN );
bcopy("devfs",mp->mnt_stat.f_mntfromname, 5);
(void)devfs_statfs(mp, &mp->mnt_stat, p);
return 0;
}
static int
mountdevfs( struct mount *mp, struct proc *p)
{
int error = 0;
struct devfsmount *devfs_mp_p;
devfs_mp_p = (struct devfsmount *)malloc(sizeof *devfs_mp_p,
M_DEVFSMNT, M_WAITOK);
bzero(devfs_mp_p,sizeof(*devfs_mp_p));
devfs_mp_p->mount = mp;
/*
* Fill out some fields
*/
mp->mnt_data = (qaddr_t)devfs_mp_p;
mp->mnt_stat.f_type = MOUNT_DEVFS;
mp->mnt_stat.f_fsid.val[0] = (long)devfs_mp_p;
mp->mnt_stat.f_fsid.val[1] = MOUNT_DEVFS;
mp->mnt_flag |= MNT_LOCAL;
if(error = dev_dup_plane(devfs_mp_p))
{
mp->mnt_data = (qaddr_t)0;
free((caddr_t)devfs_mp_p, M_DEVFSMNT);
}
return error;
}
static int
devfs_start(struct mount *mp, int flags, struct proc *p)
{
DBPRINT(("start "));
return 0;
}
/*
* Unmount the filesystem described by mp.
* Note: vnodes from this FS may hang around if being used..
* This should not be a problem, they should be self contained.
*/
static int
devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
{
struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
DBPRINT(("unmount "));
devfs_free_plane(devfs_mp_p);
free((caddr_t)devfs_mp_p, M_DEVFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return 0;
}
/* return the address of the root vnode in *vpp */
static int
devfs_root(struct mount *mp, struct vnode **vpp)
{
struct devfsmount *devfs_mp_p = (struct devfsmount *)(mp->mnt_data);
DBPRINT(("root "));
devfs_dntovn(devfs_mp_p->plane_root->dnp,vpp);
return 0;
}
static int
devfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
struct proc *p)
{
DBPRINT(("quotactl "));
return EOPNOTSUPP;
}
static int
devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p)
{
struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
/*
* Fill in the stat block.
*/
DBPRINT(("statfs "));
sbp->f_type = MOUNT_DEVFS;
sbp->f_flags = 0; /* XXX */
sbp->f_bsize = 128;
sbp->f_iosize = 1024; /* XXX*/
sbp->f_blocks = 128;
sbp->f_bfree = 0;
sbp->f_bavail = 0;
sbp->f_files = 128;
sbp->f_ffree = 0; /* what to put in here? */
sbp->f_fsid.val[0] = (long)devfs_mp_p;
sbp->f_fsid.val[1] = MOUNT_DEVFS;
/*
* Copy the mounted on and mounted from names into
* the passed in stat block, if it is not the one
* in the mount structure.
*/
if (sbp != &mp->mnt_stat) {
bcopy((caddr_t)mp->mnt_stat.f_mntonname,
(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
}
return 0;
}
static int
devfs_sync(struct mount *mp, int waitfor,struct ucred *cred,struct proc *p)
{
DBPRINT(("sync "));
return 0;
}
static int
devfs_vget(struct mount *mp, ino_t ino,struct vnode **vpp)
{
DBPRINT(("vget "));
return EOPNOTSUPP;
}
/*************************************************************
* The concept of exporting a kernel generated devfs is stupid
* So don't handle filehandles
*/
static int
devfs_fhtovp (struct mount *mp, struct fid *fhp, struct mbuf *nam,
struct vnode **vpp, int *exflagsp, struct ucred **credanonp)
{
DBPRINT(("fhtovp "));
return (EINVAL);
}
static int
devfs_vptofh (struct vnode *vp, struct fid *fhp)
{
DBPRINT(("vptofh "));
return (EINVAL);
}
static struct vfsops devfs_vfsops = {
devfs_mount,
devfs_start,
devfs_unmount,
devfs_root,
devfs_quotactl,
devfs_statfs,
devfs_sync,
devfs_vget,
devfs_fhtovp,
devfs_vptofh,
devfs_init
};
VFS_SET(devfs_vfsops, devfs, MOUNT_DEVFS, 0);
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