cec0f20ce7
1. Add new file "sys/kern/vfs_default.c" where default actions for
VOPs go. Implement proper defaults for ABORTOP, BWRITE, LEASE,
POLL, REVOKE and STRATEGY. Various stuff spread over the entire
tree belongs here.
2. Change VOP_BLKATOFF to a normal function in cd9660.
3. Kill VOP_BLKATOFF, VOP_TRUNCATE, VOP_VFREE, VOP_VALLOC. These
are private interface functions between UFS and the underlying
storage manager layer (FFS/LFS/MFS/EXT2FS). The functions now
live in struct ufsmount instead.
4. Remove a kludge of VOP_ functions in all filesystems, that did
nothing but obscure the simplicity and break the expandability.
If a filesystem doesn't implement VOP_FOO, it shouldn't have an
entry for it in its vnops table. The system will try to DTRT
if it is not implemented. There are still some cruft left, but
the bulk of it is done.
5. Fix another VCALL in vfs_cache.c (thanks Bruce!)
561 lines
14 KiB
C
561 lines
14 KiB
C
/*
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* Copyright (c) 1990, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fifo_vnops.c 8.10 (Berkeley) 5/27/95
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* $Id: fifo_vnops.c,v 1.31 1997/10/15 13:23:12 phk Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/unistd.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/vnode.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/filio.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/poll.h>
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#include <sys/un.h>
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#include <miscfs/fifofs/fifo.h>
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/*
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* This structure is associated with the FIFO vnode and stores
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* the state associated with the FIFO.
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*/
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struct fifoinfo {
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struct socket *fi_readsock;
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struct socket *fi_writesock;
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long fi_readers;
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long fi_writers;
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};
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static int fifo_ebadf __P((void));
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static int fifo_badop __P((void));
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static int fifo_print __P((struct vop_print_args *));
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static int fifo_lookup __P((struct vop_lookup_args *));
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static int fifo_open __P((struct vop_open_args *));
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static int fifo_close __P((struct vop_close_args *));
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static int fifo_read __P((struct vop_read_args *));
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static int fifo_write __P((struct vop_write_args *));
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static int fifo_ioctl __P((struct vop_ioctl_args *));
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static int fifo_poll __P((struct vop_poll_args *));
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static int fifo_inactive __P((struct vop_inactive_args *));
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static int fifo_bmap __P((struct vop_bmap_args *));
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static int fifo_pathconf __P((struct vop_pathconf_args *));
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static int fifo_advlock __P((struct vop_advlock_args *));
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vop_t **fifo_vnodeop_p;
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static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) vn_default_error },
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{ &vop_abortop_desc, (vop_t *) fifo_badop },
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{ &vop_access_desc, (vop_t *) fifo_ebadf },
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{ &vop_advlock_desc, (vop_t *) fifo_advlock },
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{ &vop_bmap_desc, (vop_t *) fifo_bmap },
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{ &vop_close_desc, (vop_t *) fifo_close },
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{ &vop_create_desc, (vop_t *) fifo_badop },
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{ &vop_fsync_desc, (vop_t *) nullop },
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{ &vop_getattr_desc, (vop_t *) fifo_ebadf },
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{ &vop_inactive_desc, (vop_t *) fifo_inactive },
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{ &vop_ioctl_desc, (vop_t *) fifo_ioctl },
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{ &vop_islocked_desc, (vop_t *) vop_noislocked },
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{ &vop_lease_desc, (vop_t *) nullop },
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{ &vop_link_desc, (vop_t *) fifo_badop },
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{ &vop_lock_desc, (vop_t *) vop_nolock },
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{ &vop_lookup_desc, (vop_t *) fifo_lookup },
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{ &vop_mkdir_desc, (vop_t *) fifo_badop },
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{ &vop_mknod_desc, (vop_t *) fifo_badop },
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{ &vop_mmap_desc, (vop_t *) fifo_badop },
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{ &vop_open_desc, (vop_t *) fifo_open },
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{ &vop_pathconf_desc, (vop_t *) fifo_pathconf },
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{ &vop_poll_desc, (vop_t *) fifo_poll },
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{ &vop_print_desc, (vop_t *) fifo_print },
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{ &vop_read_desc, (vop_t *) fifo_read },
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{ &vop_readdir_desc, (vop_t *) fifo_badop },
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{ &vop_readlink_desc, (vop_t *) fifo_badop },
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{ &vop_reallocblks_desc, (vop_t *) fifo_badop },
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{ &vop_reclaim_desc, (vop_t *) nullop },
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{ &vop_remove_desc, (vop_t *) fifo_badop },
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{ &vop_rename_desc, (vop_t *) fifo_badop },
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{ &vop_rmdir_desc, (vop_t *) fifo_badop },
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{ &vop_seek_desc, (vop_t *) fifo_badop },
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{ &vop_setattr_desc, (vop_t *) fifo_ebadf },
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{ &vop_symlink_desc, (vop_t *) fifo_badop },
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{ &vop_unlock_desc, (vop_t *) vop_nounlock },
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{ &vop_update_desc, (vop_t *) nullop },
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{ &vop_write_desc, (vop_t *) fifo_write },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc fifo_vnodeop_opv_desc =
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{ &fifo_vnodeop_p, fifo_vnodeop_entries };
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VNODEOP_SET(fifo_vnodeop_opv_desc);
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int
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fifo_vnoperate(ap)
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struct vop_generic_args /* {
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struct vnodeop_desc *a_desc;
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<other random data follows, presumably>
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} */ *ap;
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{
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return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
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}
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/*
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* Trivial lookup routine that always fails.
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*/
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/* ARGSUSED */
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static int
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fifo_lookup(ap)
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struct vop_lookup_args /* {
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struct vnode * a_dvp;
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struct vnode ** a_vpp;
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struct componentname * a_cnp;
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} */ *ap;
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{
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*ap->a_vpp = NULL;
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return (ENOTDIR);
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}
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/*
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* Open called to set up a new instance of a fifo or
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* to find an active instance of a fifo.
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*/
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/* ARGSUSED */
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static int
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fifo_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct fifoinfo *fip;
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struct proc *p = ap->a_p;
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struct socket *rso, *wso;
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int error;
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static char openstr[] = "fifo";
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if ((fip = vp->v_fifoinfo) == NULL) {
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MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
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vp->v_fifoinfo = fip;
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error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_p);
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if (error) {
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free(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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return (error);
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}
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fip->fi_readsock = rso;
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error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_p);
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if (error) {
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(void)soclose(rso);
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free(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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return (error);
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}
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fip->fi_writesock = wso;
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error = unp_connect2(wso, rso);
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if (error) {
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(void)soclose(wso);
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(void)soclose(rso);
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free(fip, M_VNODE);
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vp->v_fifoinfo = NULL;
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return (error);
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}
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fip->fi_readers = fip->fi_writers = 0;
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wso->so_state |= SS_CANTRCVMORE;
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rso->so_state |= SS_CANTSENDMORE;
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}
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if (ap->a_mode & FREAD) {
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fip->fi_readers++;
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if (fip->fi_readers == 1) {
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fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
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if (fip->fi_writers > 0)
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wakeup((caddr_t)&fip->fi_writers);
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}
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}
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if (ap->a_mode & FWRITE) {
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fip->fi_writers++;
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if (fip->fi_writers == 1) {
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fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
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if (fip->fi_readers > 0)
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wakeup((caddr_t)&fip->fi_readers);
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}
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}
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if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
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while (fip->fi_writers == 0) {
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VOP_UNLOCK(vp, 0, p);
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error = tsleep((caddr_t)&fip->fi_readers,
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PCATCH | PSOCK, openstr, 0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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if (error)
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goto bad;
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}
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}
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if (ap->a_mode & FWRITE) {
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if (ap->a_mode & O_NONBLOCK) {
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if (fip->fi_readers == 0) {
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error = ENXIO;
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goto bad;
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}
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} else {
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while (fip->fi_readers == 0) {
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VOP_UNLOCK(vp, 0, p);
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error = tsleep((caddr_t)&fip->fi_writers,
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PCATCH | PSOCK, openstr, 0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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if (error)
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goto bad;
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}
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}
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}
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return (0);
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bad:
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VOP_CLOSE(vp, ap->a_mode, ap->a_cred, p);
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return (error);
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}
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/*
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* Vnode op for read
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*/
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/* ARGSUSED */
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static int
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fifo_read(ap)
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struct vop_read_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap;
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{
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struct uio *uio = ap->a_uio;
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struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
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struct proc *p = uio->uio_procp;
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int error, startresid;
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#ifdef DIAGNOSTIC
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if (uio->uio_rw != UIO_READ)
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panic("fifo_read mode");
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#endif
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if (uio->uio_resid == 0)
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return (0);
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if (ap->a_ioflag & IO_NDELAY)
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rso->so_state |= SS_NBIO;
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startresid = uio->uio_resid;
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VOP_UNLOCK(ap->a_vp, 0, p);
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error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
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(struct mbuf **)0, (int *)0);
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vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
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/*
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* Clear EOF indication after first such return.
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*/
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if (uio->uio_resid == startresid)
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rso->so_state &= ~SS_CANTRCVMORE;
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if (ap->a_ioflag & IO_NDELAY)
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rso->so_state &= ~SS_NBIO;
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return (error);
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}
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/*
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* Vnode op for write
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*/
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/* ARGSUSED */
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static int
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fifo_write(ap)
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struct vop_write_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap;
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{
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struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
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struct proc *p = ap->a_uio->uio_procp;
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int error;
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#ifdef DIAGNOSTIC
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if (ap->a_uio->uio_rw != UIO_WRITE)
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panic("fifo_write mode");
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#endif
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if (ap->a_ioflag & IO_NDELAY)
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wso->so_state |= SS_NBIO;
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VOP_UNLOCK(ap->a_vp, 0, p);
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error = sosend(wso, (struct sockaddr *)0, ap->a_uio, 0,
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(struct mbuf *)0, 0, p);
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vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
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if (ap->a_ioflag & IO_NDELAY)
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wso->so_state &= ~SS_NBIO;
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return (error);
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}
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/*
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* Device ioctl operation.
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*/
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/* ARGSUSED */
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static int
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fifo_ioctl(ap)
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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int a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct file filetmp;
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int error;
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if (ap->a_command == FIONBIO)
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return (0);
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if (ap->a_fflag & FREAD) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
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error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
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if (error)
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return (error);
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}
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if (ap->a_fflag & FWRITE) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
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error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
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if (error)
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return (error);
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}
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return (0);
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}
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/* ARGSUSED */
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static int
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fifo_poll(ap)
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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struct file filetmp;
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int revents = 0;
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if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
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if (filetmp.f_data)
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revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
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ap->a_p);
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}
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if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
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filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
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if (filetmp.f_data)
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revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
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ap->a_p);
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}
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return (revents);
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}
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static int
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fifo_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap;
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{
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VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
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return (0);
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}
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/*
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* This is a noop, simply returning what one has been given.
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*/
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static int
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fifo_bmap(ap)
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct vnode **a_vpp;
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daddr_t *a_bnp;
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int *a_runp;
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int *a_runb;
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} */ *ap;
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{
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|
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if (ap->a_vpp != NULL)
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*ap->a_vpp = ap->a_vp;
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if (ap->a_bnp != NULL)
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*ap->a_bnp = ap->a_bn;
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if (ap->a_runp != NULL)
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*ap->a_runp = 0;
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if (ap->a_runb != NULL)
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*ap->a_runb = 0;
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return (0);
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}
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/*
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* Device close routine
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|
*/
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/* ARGSUSED */
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static int
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fifo_close(ap)
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struct vop_close_args /* {
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struct vnode *a_vp;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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register struct vnode *vp = ap->a_vp;
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register struct fifoinfo *fip = vp->v_fifoinfo;
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int error1, error2;
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if (ap->a_fflag & FREAD) {
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fip->fi_readers--;
|
|
if (fip->fi_readers == 0)
|
|
socantsendmore(fip->fi_writesock);
|
|
}
|
|
if (ap->a_fflag & FWRITE) {
|
|
fip->fi_writers--;
|
|
if (fip->fi_writers == 0)
|
|
socantrcvmore(fip->fi_readsock);
|
|
}
|
|
if (vp->v_usecount > 1)
|
|
return (0);
|
|
error1 = soclose(fip->fi_readsock);
|
|
error2 = soclose(fip->fi_writesock);
|
|
FREE(fip, M_VNODE);
|
|
vp->v_fifoinfo = NULL;
|
|
if (error1)
|
|
return (error1);
|
|
return (error2);
|
|
}
|
|
|
|
|
|
/*
|
|
* Print out internal contents of a fifo vnode.
|
|
*/
|
|
int
|
|
fifo_printinfo(vp)
|
|
struct vnode *vp;
|
|
{
|
|
register struct fifoinfo *fip = vp->v_fifoinfo;
|
|
|
|
printf(", fifo with %ld readers and %ld writers",
|
|
fip->fi_readers, fip->fi_writers);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a fifo vnode.
|
|
*/
|
|
static int
|
|
fifo_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
printf("tag VT_NON");
|
|
fifo_printinfo(ap->a_vp);
|
|
printf("\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to fifo's.
|
|
*/
|
|
static int
|
|
fifo_pathconf(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_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Fifo failed operation
|
|
*/
|
|
static int
|
|
fifo_ebadf()
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* Fifo advisory byte-level locks.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
fifo_advlock(ap)
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
caddr_t a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Fifo bad operation
|
|
*/
|
|
static int
|
|
fifo_badop()
|
|
{
|
|
|
|
panic("fifo_badop called");
|
|
/* NOTREACHED */
|
|
}
|