/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed * to Berkeley by John Heidemann of the UCLA Ficus project. * * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * * $FreeBSD: src/sys/kern/vfs_default.c,v 1.28.2.7 2003/01/10 18:23:26 bde Exp $ * $DragonFly: src/sys/kern/vfs_default.c,v 1.9 2004/03/01 06:33:17 dillon Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int vop_nolookup (struct vop_lookup_args *); static int vop_nostrategy (struct vop_strategy_args *); /* * This vnode table stores what we want to do if the filesystem doesn't * implement a particular VOP. * * If there is no specific entry here, we will return EOPNOTSUPP. * */ vop_t **default_vnodeop_p; static struct vnodeopv_entry_desc default_vnodeop_entries[] = { { &vop_default_desc, (vop_t *) vop_eopnotsupp }, { &vop_advlock_desc, (vop_t *) vop_einval }, { &vop_bwrite_desc, (vop_t *) vop_stdbwrite }, { &vop_close_desc, (vop_t *) vop_null }, { &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject }, { &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject }, { &vop_fsync_desc, (vop_t *) vop_null }, { &vop_getvobject_desc, (vop_t *) vop_stdgetvobject }, { &vop_ioctl_desc, (vop_t *) vop_enotty }, { &vop_islocked_desc, (vop_t *) vop_noislocked }, { &vop_lease_desc, (vop_t *) vop_null }, { &vop_lock_desc, (vop_t *) vop_nolock }, { &vop_mmap_desc, (vop_t *) vop_einval }, { &vop_lookup_desc, (vop_t *) vop_nolookup }, { &vop_open_desc, (vop_t *) vop_null }, { &vop_pathconf_desc, (vop_t *) vop_einval }, { &vop_poll_desc, (vop_t *) vop_nopoll }, { &vop_readlink_desc, (vop_t *) vop_einval }, { &vop_reallocblks_desc, (vop_t *) vop_eopnotsupp }, { &vop_revoke_desc, (vop_t *) vop_revoke }, { &vop_strategy_desc, (vop_t *) vop_nostrategy }, { &vop_unlock_desc, (vop_t *) vop_nounlock }, { &vop_getacl_desc, (vop_t *) vop_eopnotsupp }, { &vop_setacl_desc, (vop_t *) vop_eopnotsupp }, { &vop_aclcheck_desc, (vop_t *) vop_eopnotsupp }, { &vop_getextattr_desc, (vop_t *) vop_eopnotsupp }, { &vop_setextattr_desc, (vop_t *) vop_eopnotsupp }, { NULL, NULL } }; static struct vnodeopv_desc default_vnodeop_opv_desc = { &default_vnodeop_p, default_vnodeop_entries }; VNODEOP_SET(default_vnodeop_opv_desc); int vop_eopnotsupp(struct vop_generic_args *ap) { /* printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); */ return (EOPNOTSUPP); } int vop_ebadf(struct vop_generic_args *ap) { return (EBADF); } int vop_enotty(struct vop_generic_args *ap) { return (ENOTTY); } int vop_einval(struct vop_generic_args *ap) { return (EINVAL); } int vop_null(struct vop_generic_args *ap) { return (0); } int vop_defaultop(struct vop_generic_args *ap) { return (VOCALL(default_vnodeop_p, ap->a_desc->vdesc_offset, ap)); } int vop_panic(struct vop_generic_args *ap) { panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); } static int vop_nolookup(ap) struct vop_lookup_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; } */ *ap; { *ap->a_vpp = NULL; return (ENOTDIR); } /* * vop_nostrategy: * * Strategy routine for VFS devices that have none. * * B_ERROR and B_INVAL must be cleared prior to calling any strategy * routine. Typically this is done for a B_READ strategy call. Typically * B_INVAL is assumed to already be clear prior to a write and should not * be cleared manually unless you just made the buffer invalid. B_ERROR * should be cleared either way. */ static int vop_nostrategy (struct vop_strategy_args *ap) { printf("No strategy for buffer at %p\n", ap->a_bp); vprint("", ap->a_vp); vprint("", ap->a_bp->b_vp); ap->a_bp->b_flags |= B_ERROR; ap->a_bp->b_error = EOPNOTSUPP; biodone(ap->a_bp); return (EOPNOTSUPP); } int vop_stdpathconf(ap) struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; int *a_retval; } */ *ap; { switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = LINK_MAX; return (0); case _PC_MAX_CANON: *ap->a_retval = MAX_CANON; return (0); case _PC_MAX_INPUT: *ap->a_retval = MAX_INPUT; return (0); case _PC_PIPE_BUF: *ap->a_retval = PIPE_BUF; return (0); case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; return (0); case _PC_VDISABLE: *ap->a_retval = _POSIX_VDISABLE; return (0); default: return (EINVAL); } /* NOTREACHED */ } /* * Standard lock, unlock and islocked functions. * * These depend on the lock structure being the first element in the * inode, ie: vp->v_data points to the the lock! */ int vop_stdlock(ap) struct vop_lock_args /* { struct vnode *a_vp; lwkt_tokref_t a_vlock; int a_flags; struct proc *a_p; } */ *ap; { struct lock *l; if ((l = (struct lock *)ap->a_vp->v_data) == NULL) { if (ap->a_flags & LK_INTERLOCK) lwkt_reltoken(ap->a_vlock); return 0; } #ifndef DEBUG_LOCKS return (lockmgr(l, ap->a_flags, ap->a_vlock, ap->a_td)); #else return (debuglockmgr(l, ap->a_flags, ap->a_vlock, ap->a_td, "vop_stdlock", ap->a_vp->filename, ap->a_vp->line)); #endif } int vop_stdunlock(ap) struct vop_unlock_args /* { struct vnode *a_vp; lwkt_tokref_t a_vlock; int a_flags; struct thread *a_td; } */ *ap; { struct lock *l; if ((l = (struct lock *)ap->a_vp->v_data) == NULL) { if (ap->a_flags & LK_INTERLOCK) lwkt_reltoken(ap->a_vlock); return 0; } return (lockmgr(l, ap->a_flags | LK_RELEASE, ap->a_vlock, ap->a_td)); } int vop_stdislocked(ap) struct vop_islocked_args /* { struct vnode *a_vp; struct thread *a_td; } */ *ap; { struct lock *l; if ((l = (struct lock *)ap->a_vp->v_data) == NULL) return 0; return (lockstatus(l, ap->a_td)); } /* * Return true for select/poll. */ int vop_nopoll(ap) struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct ucred *a_cred; struct proc *a_p; } */ *ap; { /* * Return true for read/write. If the user asked for something * special, return POLLNVAL, so that clients have a way of * determining reliably whether or not the extended * functionality is present without hard-coding knowledge * of specific filesystem implementations. */ if (ap->a_events & ~POLLSTANDARD) return (POLLNVAL); return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); } /* * Implement poll for local filesystems that support it. */ int vop_stdpoll(ap) struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct ucred *a_cred; struct thread *a_td; } */ *ap; { if (ap->a_events & ~POLLSTANDARD) return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); } int vop_stdbwrite(ap) struct vop_bwrite_args *ap; { return (bwrite(ap->a_bp)); } /* * Stubs to use when there is no locking to be done on the underlying object. * A minimal shared lock is necessary to ensure that the underlying object * is not revoked while an operation is in progress. So, an active shared * count is maintained in an auxillary vnode lock structure. */ int vop_sharedlock(ap) struct vop_lock_args /* { struct vnode *a_vp; lwkt_tokref_t a_vlock; int a_flags; struct proc *a_p; } */ *ap; { /* * This code cannot be used until all the non-locking filesystems * (notably NFS) are converted to properly lock and release nodes. * Also, certain vnode operations change the locking state within * the operation (create, mknod, remove, link, rename, mkdir, rmdir, * and symlink). Ideally these operations should not change the * lock state, but should be changed to let the caller of the * function unlock them. Otherwise all intermediate vnode layers * (such as union, umapfs, etc) must catch these functions to do * the necessary locking at their layer. Note that the inactive * and lookup operations also change their lock state, but this * cannot be avoided, so these two operations will always need * to be handled in intermediate layers. */ struct vnode *vp = ap->a_vp; struct lock *l = (struct lock *)vp->v_data; int vnflags, flags = ap->a_flags; if (l == NULL) { if (ap->a_flags & LK_INTERLOCK) lwkt_reltoken(ap->a_vlock); return 0; } switch (flags & LK_TYPE_MASK) { case LK_DRAIN: vnflags = LK_DRAIN; break; case LK_EXCLUSIVE: #ifdef DEBUG_VFS_LOCKS /* * Normally, we use shared locks here, but that confuses * the locking assertions. */ vnflags = LK_EXCLUSIVE; break; #endif case LK_SHARED: vnflags = LK_SHARED; break; case LK_UPGRADE: case LK_EXCLUPGRADE: case LK_DOWNGRADE: return (0); case LK_RELEASE: default: panic("vop_sharedlock: bad operation %d", flags & LK_TYPE_MASK); } if (flags & LK_INTERLOCK) vnflags |= LK_INTERLOCK; #ifndef DEBUG_LOCKS return (lockmgr(l, vnflags, ap->a_vlock, ap->a_td)); #else return (debuglockmgr(l, vnflags, ap->a_vlock, ap->a_td, "vop_sharedlock", vp->filename, vp->line)); #endif } /* * Stubs to use when there is no locking to be done on the underlying object. * A minimal shared lock is necessary to ensure that the underlying object * is not revoked while an operation is in progress. So, an active shared * count is maintained in an auxillary vnode lock structure. */ int vop_nolock(ap) struct vop_lock_args /* { struct vnode *a_vp; lwkt_tokref_t a_vlock; int a_flags; struct proc *a_p; } */ *ap; { #ifdef notyet /* * This code cannot be used until all the non-locking filesystems * (notably NFS) are converted to properly lock and release nodes. * Also, certain vnode operations change the locking state within * the operation (create, mknod, remove, link, rename, mkdir, rmdir, * and symlink). Ideally these operations should not change the * lock state, but should be changed to let the caller of the * function unlock them. Otherwise all intermediate vnode layers * (such as union, umapfs, etc) must catch these functions to do * the necessary locking at their layer. Note that the inactive * and lookup operations also change their lock state, but this * cannot be avoided, so these two operations will always need * to be handled in intermediate layers. */ struct vnode *vp = ap->a_vp; int vnflags, flags = ap->a_flags; switch (flags & LK_TYPE_MASK) { case LK_DRAIN: vnflags = LK_DRAIN; break; case LK_EXCLUSIVE: case LK_SHARED: vnflags = LK_SHARED; break; case LK_UPGRADE: case LK_EXCLUPGRADE: case LK_DOWNGRADE: return (0); case LK_RELEASE: default: panic("vop_nolock: bad operation %d", flags & LK_TYPE_MASK); } if (flags & LK_INTERLOCK) vnflags |= LK_INTERLOCK; return(lockmgr(vp->v_vnlock, vnflags, ap->a_vlock, ap->a_p)); #else /* for now */ /* * Since we are not using the lock manager, we must clear * the interlock here. */ if (ap->a_flags & LK_INTERLOCK) lwkt_reltoken(ap->a_vlock); return (0); #endif } /* * Do the inverse of vop_nolock, handling the interlock in a compatible way. */ int vop_nounlock(ap) struct vop_unlock_args /* { struct vnode *a_vp; lwkt_tokref_t a_vlock; int a_flags; struct proc *a_p; } */ *ap; { if (ap->a_flags & LK_INTERLOCK) lwkt_reltoken(ap->a_vlock); return (0); } /* * Return whether or not the node is in use. */ int vop_noislocked(ap) struct vop_islocked_args /* { struct vnode *a_vp; struct proc *a_p; } */ *ap; { return (0); } int vop_stdcreatevobject(ap) struct vop_createvobject_args /* { struct vnode *a_vp; struct proc *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct thread *td = ap->a_td; struct vattr vat; vm_object_t object; int error = 0; if (!vn_isdisk(vp, NULL) && vn_canvmio(vp) == FALSE) return (0); retry: if ((object = vp->v_object) == NULL) { if (vp->v_type == VREG || vp->v_type == VDIR) { if ((error = VOP_GETATTR(vp, &vat, td)) != 0) goto retn; object = vnode_pager_alloc(vp, vat.va_size, 0, 0); } else if (dev_dport(vp->v_rdev) != NULL) { /* * This simply allocates the biggest object possible * for a disk vnode. This should be fixed, but doesn't * cause any problems (yet). */ object = vnode_pager_alloc(vp, IDX_TO_OFF(INT_MAX), 0, 0); } else { goto retn; } /* * Dereference the reference we just created. This assumes * that the object is associated with the vp. */ object->ref_count--; vp->v_usecount--; } else { if (object->flags & OBJ_DEAD) { VOP_UNLOCK(vp, NULL, 0, td); tsleep(object, 0, "vodead", 0); vn_lock(vp, NULL, LK_EXCLUSIVE | LK_RETRY, td); goto retry; } } KASSERT(vp->v_object != NULL, ("vfs_object_create: NULL object")); vp->v_flag |= VOBJBUF; retn: return (error); } int vop_stddestroyvobject(ap) struct vop_destroyvobject_args /* { struct vnode *vp; } */ *ap; { struct vnode *vp = ap->a_vp; vm_object_t obj = vp->v_object; if (vp->v_object == NULL) return (0); if (obj->ref_count == 0) { /* * vclean() may be called twice. The first time * removes the primary reference to the object, * the second time goes one further and is a * special-case to terminate the object. * * don't double-terminate the object. */ if ((obj->flags & OBJ_DEAD) == 0) vm_object_terminate(obj); } else { /* * Woe to the process that tries to page now :-). */ vm_pager_deallocate(obj); } return (0); } /* * Return the underlying VM object. This routine may be called with or * without the vnode interlock held. If called without, the returned * object is not guarenteed to be valid. The syncer typically gets the * object without holding the interlock in order to quickly test whether * it might be dirty before going heavy-weight. vm_object's use zalloc * and thus stable-storage, so this is safe. */ int vop_stdgetvobject(ap) struct vop_getvobject_args /* { struct vnode *vp; struct vm_object **objpp; } */ *ap; { struct vnode *vp = ap->a_vp; struct vm_object **objpp = ap->a_objpp; if (objpp) *objpp = vp->v_object; return (vp->v_object ? 0 : EINVAL); } /* * vfs default ops * used to fill the vfs fucntion table to get reasonable default return values. */ int vfs_stdmount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, struct thread *td) { return (0); } int vfs_stdunmount(struct mount *mp, int mntflags, struct thread *td) { return (0); } int vfs_stdroot(struct mount *mp, struct vnode **vpp) { return (EOPNOTSUPP); } int vfs_stdstatfs(struct mount *mp, struct statfs *sbp, struct thread *td) { return (EOPNOTSUPP); } int vfs_stdvptofh(struct vnode *vp, struct fid *fhp) { return (EOPNOTSUPP); } int vfs_stdstart(struct mount *mp, int flags, struct thread *td) { return (0); } int vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, struct thread *td) { return (EOPNOTSUPP); } int vfs_stdsync(struct mount *mp, int waitfor, struct thread *td) { return (0); } int vfs_stdvget(struct mount *mp, ino_t ino, struct vnode **vpp) { return (EOPNOTSUPP); } int vfs_stdfhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { return (EOPNOTSUPP); } int vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp, struct ucred **credanonp) { return (EOPNOTSUPP); } int vfs_stdinit(struct vfsconf *vfsp) { return (0); } int vfs_stduninit(struct vfsconf *vfsp) { return(0); } int vfs_stdextattrctl(struct mount *mp, int cmd, const char *attrname, caddr_t arg, struct thread *td) { return(EOPNOTSUPP); } /* end of vfs default ops */