/*- * Written by Julian Elischer (julian@DIALix.oz.au) * * $Header: /home/ncvs/src/sys/miscfs/devfs/devfs_vfsops.c,v 1.24 1997/10/16 07:28:50 julian Exp $ * * */ #include #include #include #include #include #include #include static MALLOC_DEFINE(M_DEVFSMNT, "DEVFS mount", "DEVFS mount structure"); static int devfs_statfs( struct mount *mp, struct statfs *sbp, struct proc *p); /*- * Called from the generic VFS startups. * This is the second stage of DEVFS initialisation. * The probed devices have already been loaded and the * basic structure of the DEVFS created. * We take the oportunity to mount the hidden DEVFS layer, so that * devices from devfs get sync'd. */ static int devfs_init(struct vfsconf *vfsp) { struct mount *mp = dev_root->dnp->dvm->mount; /*- * fill in the missing members on the "hidden" mount * we could almost use vfs_rootmountalloc() to do this. */ lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); mp->mnt_op = vfsp->vfc_vfsops; mp->mnt_vfc = vfsp; mp->mnt_stat.f_type = vfsp->vfc_typenum; mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); mp->mnt_vnodecovered = NULLVP; /* Mark a reference for the "invisible" blueprint mount */ mp->mnt_vfc->vfc_refcount++; CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 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 info */ 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. */ devfs_mp_p = (struct devfsmount *)malloc(sizeof *devfs_mp_p, M_DEVFSMNT, M_WAITOK); if (devfs_mp_p == NULL) return (ENOMEM); bzero(devfs_mp_p,sizeof(*devfs_mp_p)); devfs_mp_p->mount = mp; mp->mnt_data = (void *)devfs_mp_p; /*- * 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); } /*- * 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 */ 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 devfs_start(struct mount *mp, int flags, struct proc *p) { DBPRINT(("start ")); return 0; } /*- * Unmount the filesystem described by mp. */ static int devfs_unmount( struct mount *mp, int mntflags, struct proc *p) { struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data; int flags = 0; int error; if (mntflags & MNT_FORCE) { flags |= FORCECLOSE; } error = vflush(mp, NULLVP, flags); if (error) return error; 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; } /*- * Go through the disk queues to initiate sandbagged IO; * go through the inodes to write those that have been modified; * initiate the writing of the super block if it has been modified. * * Note: we are always called with the filesystem marked `MPBUSY'. */ static int devfs_sync(struct mount *mp, int waitfor,struct ucred *cred,struct proc *p) { register struct vnode *vp, *nvp; struct timeval tv; int error, allerror = 0; DBPRINT(("sync ")); /*- * Write back modified superblock. * Consistency check that the superblock * is still in the buffer cache. */ /*- * Write back each (modified) inode. */ loop: for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { /*- * If the vnode that we are about to sync is no longer * associated with this mount point, start over. */ if (vp->v_mount != mp) goto loop; nvp = vp->v_mntvnodes.le_next; if (VOP_ISLOCKED(vp)) continue; if ( vp->v_dirtyblkhd.lh_first == NULL) continue; if (vp->v_type == VBLK) { if (vget(vp, LK_EXCLUSIVE, p)) goto loop; error = VOP_FSYNC(vp, cred, waitfor, p); if (error) allerror = error; vput(vp); } #ifdef NOTYET else { tv = time; /* VOP_UPDATE(vp, &tv, &tv, waitfor == MNT_WAIT); */ VOP_UPDATE(vp, &tv, &tv, 0); } #endif } /*- * Force stale file system control information to be flushed. *( except that htat makes no sense with devfs */ return (allerror); } 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 sockaddr *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);