21144e3bf1
field in struct buf: b_iocmd. The b_iocmd is enforced to have exactly one bit set. B_WRITE was bogusly defined as zero giving rise to obvious coding mistakes. Also eliminate the redundant struct buf flag B_CALL, it can just as efficiently be done by comparing b_iodone to NULL. Should you get a panic or drop into the debugger, complaining about "b_iocmd", don't continue. It is likely to write on your disk where it should have been reading. This change is a step in the direction towards a stackable BIO capability. A lot of this patch were machine generated (Thanks to style(9) compliance!) Vinum users: Greg has not had time to test this yet, be careful.
635 lines
15 KiB
C
635 lines
15 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed
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* to Berkeley by John Heidemann of the UCLA Ficus project.
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*
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* Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
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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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*
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* $FreeBSD$
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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/buf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/poll.h>
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static int vop_nostrategy __P((struct vop_strategy_args *));
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/*
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* This vnode table stores what we want to do if the filesystem doesn't
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* implement a particular VOP.
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*
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* If there is no specific entry here, we will return EOPNOTSUPP.
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*
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*/
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vop_t **default_vnodeop_p;
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static struct vnodeopv_entry_desc default_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_advlock_desc, (vop_t *) vop_einval },
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{ &vop_bwrite_desc, (vop_t *) vop_stdbwrite },
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{ &vop_close_desc, (vop_t *) vop_null },
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{ &vop_fsync_desc, (vop_t *) vop_null },
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{ &vop_ioctl_desc, (vop_t *) vop_enotty },
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{ &vop_islocked_desc, (vop_t *) vop_noislocked },
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{ &vop_lease_desc, (vop_t *) vop_null },
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{ &vop_lock_desc, (vop_t *) vop_nolock },
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{ &vop_mmap_desc, (vop_t *) vop_einval },
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{ &vop_open_desc, (vop_t *) vop_null },
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{ &vop_pathconf_desc, (vop_t *) vop_einval },
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{ &vop_poll_desc, (vop_t *) vop_nopoll },
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{ &vop_readlink_desc, (vop_t *) vop_einval },
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{ &vop_reallocblks_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_revoke_desc, (vop_t *) vop_revoke },
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{ &vop_strategy_desc, (vop_t *) vop_nostrategy },
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{ &vop_unlock_desc, (vop_t *) vop_nounlock },
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{ &vop_getacl_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_setacl_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_aclcheck_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_getextattr_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_setextattr_desc, (vop_t *) vop_eopnotsupp },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc default_vnodeop_opv_desc =
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{ &default_vnodeop_p, default_vnodeop_entries };
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VNODEOP_SET(default_vnodeop_opv_desc);
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int
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vop_eopnotsupp(struct vop_generic_args *ap)
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{
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/*
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printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
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*/
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return (EOPNOTSUPP);
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}
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int
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vop_ebadf(struct vop_generic_args *ap)
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{
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return (EBADF);
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}
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int
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vop_enotty(struct vop_generic_args *ap)
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{
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return (ENOTTY);
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}
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int
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vop_einval(struct vop_generic_args *ap)
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{
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return (EINVAL);
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}
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int
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vop_null(struct vop_generic_args *ap)
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{
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return (0);
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}
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int
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vop_defaultop(struct vop_generic_args *ap)
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{
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return (VOCALL(default_vnodeop_p, ap->a_desc->vdesc_offset, ap));
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}
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int
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vop_panic(struct vop_generic_args *ap)
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{
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printf("vop_panic[%s]\n", ap->a_desc->vdesc_name);
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panic("Filesystem goof");
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return (0);
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}
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/*
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* vop_nostrategy:
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*
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* Strategy routine for VFS devices that have none.
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*
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* B_ERROR and B_INVAL must be cleared prior to calling any strategy
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* routine. Typically this is done for a BIO_READ strategy call.
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* Typically B_INVAL is assumed to already be clear prior to a write
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* and should not be cleared manually unless you just made the buffer
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* invalid. B_ERROR should be cleared either way.
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*/
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static int
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vop_nostrategy (struct vop_strategy_args *ap)
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{
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printf("No strategy for buffer at %p\n", ap->a_bp);
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vprint("", ap->a_vp);
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vprint("", ap->a_bp->b_vp);
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ap->a_bp->b_flags |= B_ERROR;
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ap->a_bp->b_error = EOPNOTSUPP;
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biodone(ap->a_bp);
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return (EOPNOTSUPP);
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}
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int
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vop_stdpathconf(ap)
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struct vop_pathconf_args /* {
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struct vnode *a_vp;
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int a_name;
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int *a_retval;
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} */ *ap;
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{
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switch (ap->a_name) {
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case _PC_LINK_MAX:
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*ap->a_retval = LINK_MAX;
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return (0);
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case _PC_MAX_CANON:
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*ap->a_retval = MAX_CANON;
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return (0);
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case _PC_MAX_INPUT:
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*ap->a_retval = MAX_INPUT;
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return (0);
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case _PC_PIPE_BUF:
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*ap->a_retval = PIPE_BUF;
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return (0);
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case _PC_CHOWN_RESTRICTED:
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*ap->a_retval = 1;
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return (0);
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case _PC_VDISABLE:
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*ap->a_retval = _POSIX_VDISABLE;
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return (0);
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default:
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return (EINVAL);
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}
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/* NOTREACHED */
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}
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/*
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* Standard lock, unlock and islocked functions.
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*
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* These depend on the lock structure being the first element in the
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* inode, ie: vp->v_data points to the the lock!
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*/
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int
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vop_stdlock(ap)
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct proc *a_p;
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} */ *ap;
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{
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struct lock *l;
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if ((l = (struct lock *)ap->a_vp->v_data) == NULL) {
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if (ap->a_flags & LK_INTERLOCK)
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simple_unlock(&ap->a_vp->v_interlock);
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return 0;
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}
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#ifndef DEBUG_LOCKS
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return (lockmgr(l, ap->a_flags, &ap->a_vp->v_interlock, ap->a_p));
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#else
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return (debuglockmgr(l, ap->a_flags, &ap->a_vp->v_interlock, ap->a_p,
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"vop_stdlock", ap->a_vp->filename, ap->a_vp->line));
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#endif
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}
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int
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vop_stdunlock(ap)
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struct vop_unlock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct proc *a_p;
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} */ *ap;
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{
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struct lock *l;
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if ((l = (struct lock *)ap->a_vp->v_data) == NULL) {
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if (ap->a_flags & LK_INTERLOCK)
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simple_unlock(&ap->a_vp->v_interlock);
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return 0;
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}
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return (lockmgr(l, ap->a_flags | LK_RELEASE, &ap->a_vp->v_interlock,
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ap->a_p));
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}
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int
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vop_stdislocked(ap)
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struct vop_islocked_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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struct lock *l;
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if ((l = (struct lock *)ap->a_vp->v_data) == NULL)
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return 0;
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return (lockstatus(l, ap->a_p));
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}
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/*
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* Return true for select/poll.
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*/
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int
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vop_nopoll(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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/*
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* Return true for read/write. If the user asked for something
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* special, return POLLNVAL, so that clients have a way of
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* determining reliably whether or not the extended
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* functionality is present without hard-coding knowledge
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* of specific filesystem implementations.
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*/
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if (ap->a_events & ~POLLSTANDARD)
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return (POLLNVAL);
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return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
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}
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/*
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* Implement poll for local filesystems that support it.
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*/
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int
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vop_stdpoll(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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if ((ap->a_events & ~POLLSTANDARD) == 0)
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return (ap->a_events & (POLLRDNORM|POLLWRNORM));
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return (vn_pollrecord(ap->a_vp, ap->a_p, ap->a_events));
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}
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int
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vop_stdbwrite(ap)
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struct vop_bwrite_args *ap;
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{
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return (bwrite(ap->a_bp));
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}
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/*
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* Stubs to use when there is no locking to be done on the underlying object.
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* A minimal shared lock is necessary to ensure that the underlying object
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* is not revoked while an operation is in progress. So, an active shared
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* count is maintained in an auxillary vnode lock structure.
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*/
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int
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vop_sharedlock(ap)
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct proc *a_p;
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} */ *ap;
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{
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/*
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* This code cannot be used until all the non-locking filesystems
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* (notably NFS) are converted to properly lock and release nodes.
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* Also, certain vnode operations change the locking state within
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* the operation (create, mknod, remove, link, rename, mkdir, rmdir,
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* and symlink). Ideally these operations should not change the
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* lock state, but should be changed to let the caller of the
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* function unlock them. Otherwise all intermediate vnode layers
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* (such as union, umapfs, etc) must catch these functions to do
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* the necessary locking at their layer. Note that the inactive
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* and lookup operations also change their lock state, but this
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* cannot be avoided, so these two operations will always need
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* to be handled in intermediate layers.
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*/
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struct vnode *vp = ap->a_vp;
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int vnflags, flags = ap->a_flags;
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if (vp->v_vnlock == NULL) {
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if ((flags & LK_TYPE_MASK) == LK_DRAIN)
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return (0);
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MALLOC(vp->v_vnlock, struct lock *, sizeof(struct lock),
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M_VNODE, M_WAITOK);
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lockinit(vp->v_vnlock, PVFS, "vnlock", 0, LK_NOPAUSE);
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}
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switch (flags & LK_TYPE_MASK) {
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case LK_DRAIN:
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vnflags = LK_DRAIN;
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break;
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case LK_EXCLUSIVE:
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#ifdef DEBUG_VFS_LOCKS
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/*
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* Normally, we use shared locks here, but that confuses
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* the locking assertions.
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*/
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vnflags = LK_EXCLUSIVE;
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break;
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#endif
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case LK_SHARED:
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vnflags = LK_SHARED;
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break;
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case LK_UPGRADE:
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case LK_EXCLUPGRADE:
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case LK_DOWNGRADE:
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return (0);
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case LK_RELEASE:
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default:
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panic("vop_sharedlock: bad operation %d", flags & LK_TYPE_MASK);
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}
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if (flags & LK_INTERLOCK)
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vnflags |= LK_INTERLOCK;
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#ifndef DEBUG_LOCKS
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return (lockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p));
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#else
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return (debuglockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p,
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"vop_sharedlock", vp->filename, vp->line));
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#endif
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}
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/*
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* Stubs to use when there is no locking to be done on the underlying object.
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* A minimal shared lock is necessary to ensure that the underlying object
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* is not revoked while an operation is in progress. So, an active shared
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* count is maintained in an auxillary vnode lock structure.
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*/
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int
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vop_nolock(ap)
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struct vop_lock_args /* {
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struct vnode *a_vp;
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int a_flags;
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struct proc *a_p;
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} */ *ap;
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{
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#ifdef notyet
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/*
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* This code cannot be used until all the non-locking filesystems
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* (notably NFS) are converted to properly lock and release nodes.
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* Also, certain vnode operations change the locking state within
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* the operation (create, mknod, remove, link, rename, mkdir, rmdir,
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* and symlink). Ideally these operations should not change the
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* lock state, but should be changed to let the caller of the
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* function unlock them. Otherwise all intermediate vnode layers
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* (such as union, umapfs, etc) must catch these functions to do
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* the necessary locking at their layer. Note that the inactive
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* and lookup operations also change their lock state, but this
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* cannot be avoided, so these two operations will always need
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* to be handled in intermediate layers.
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*/
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struct vnode *vp = ap->a_vp;
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int vnflags, flags = ap->a_flags;
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if (vp->v_vnlock == NULL) {
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if ((flags & LK_TYPE_MASK) == LK_DRAIN)
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return (0);
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MALLOC(vp->v_vnlock, struct lock *, sizeof(struct lock),
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M_VNODE, M_WAITOK);
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lockinit(vp->v_vnlock, PVFS, "vnlock", 0, LK_NOPAUSE);
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}
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switch (flags & LK_TYPE_MASK) {
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case LK_DRAIN:
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vnflags = LK_DRAIN;
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break;
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case LK_EXCLUSIVE:
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case LK_SHARED:
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vnflags = LK_SHARED;
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break;
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case LK_UPGRADE:
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case LK_EXCLUPGRADE:
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case LK_DOWNGRADE:
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return (0);
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case LK_RELEASE:
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default:
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panic("vop_nolock: bad operation %d", flags & LK_TYPE_MASK);
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}
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if (flags & LK_INTERLOCK)
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vnflags |= LK_INTERLOCK;
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return(lockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p));
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#else /* for now */
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/*
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* Since we are not using the lock manager, we must clear
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* the interlock here.
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*/
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if (ap->a_flags & LK_INTERLOCK)
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simple_unlock(&ap->a_vp->v_interlock);
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return (0);
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#endif
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}
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/*
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* Do the inverse of vop_nolock, handling the interlock in a compatible way.
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*/
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int
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vop_nounlock(ap)
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struct vop_unlock_args /* {
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struct vnode *a_vp;
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int a_flags;
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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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if (vp->v_vnlock == NULL) {
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if (ap->a_flags & LK_INTERLOCK)
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simple_unlock(&ap->a_vp->v_interlock);
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return (0);
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}
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return (lockmgr(vp->v_vnlock, LK_RELEASE | ap->a_flags,
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&ap->a_vp->v_interlock, ap->a_p));
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}
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/*
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* Return whether or not the node is in use.
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*/
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int
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vop_noislocked(ap)
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struct vop_islocked_args /* {
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struct vnode *a_vp;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
if (vp->v_vnlock == NULL)
|
|
return (0);
|
|
return (lockstatus(vp->v_vnlock, ap->a_p));
|
|
}
|
|
|
|
/*
|
|
* vfs default ops
|
|
* used to fill the vfs fucntion table to get reasonable default return values.
|
|
*/
|
|
int
|
|
vfs_stdmount (mp, path, data, ndp, p)
|
|
struct mount *mp;
|
|
char *path;
|
|
caddr_t data;
|
|
struct nameidata *ndp;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdunmount (mp, mntflags, p)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdroot (mp, vpp)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstatfs (mp, sbp, p)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdvptofh (vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdstart (mp, flags, p)
|
|
struct mount *mp;
|
|
int flags;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdquotactl (mp, cmds, uid, arg, p)
|
|
struct mount *mp;
|
|
int cmds;
|
|
uid_t uid;
|
|
caddr_t arg;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdsync (mp, waitfor, cred, p)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stdvget (mp, ino, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdfhtovp (mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdcheckexp (mp, nam, extflagsp, credanonp)
|
|
struct mount *mp;
|
|
struct sockaddr *nam;
|
|
int *extflagsp;
|
|
struct ucred **credanonp;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
int
|
|
vfs_stdinit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vfs_stduninit (vfsp)
|
|
struct vfsconf *vfsp;
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
vfs_stdextattrctl(mp, cmd, attrname, arg, p)
|
|
struct mount *mp;
|
|
int cmd;
|
|
const char *attrname;
|
|
caddr_t arg;
|
|
struct proc *p;
|
|
{
|
|
return(EOPNOTSUPP);
|
|
}
|
|
|
|
/* end of vfs default ops */
|