xref: /csrg-svn/sys/ufs/mfs/mfs_vnops.c (revision 69611)
139019Smckusick /*
263375Sbostic  * Copyright (c) 1989, 1993
363375Sbostic  *	The Regents of the University of California.  All rights reserved.
439019Smckusick  *
544536Sbostic  * %sccs.include.redist.c%
639019Smckusick  *
7*69611Smckusick  *	@(#)mfs_vnops.c	8.11 (Berkeley) 05/22/95
839019Smckusick  */
939019Smckusick 
1051477Sbostic #include <sys/param.h>
1151477Sbostic #include <sys/systm.h>
1251477Sbostic #include <sys/time.h>
1351477Sbostic #include <sys/kernel.h>
1451477Sbostic #include <sys/proc.h>
1551477Sbostic #include <sys/buf.h>
1651477Sbostic #include <sys/map.h>
1751477Sbostic #include <sys/vnode.h>
1851981Smckusick #include <sys/malloc.h>
1947571Skarels 
2055093Spendry #include <miscfs/specfs/specdev.h>
2155093Spendry 
2251477Sbostic #include <machine/vmparam.h>
2347571Skarels 
2451477Sbostic #include <ufs/mfs/mfsnode.h>
2551477Sbostic #include <ufs/mfs/mfsiom.h>
2651477Sbostic #include <ufs/mfs/mfs_extern.h>
2739019Smckusick 
2839019Smckusick /*
2939019Smckusick  * mfs vnode operations.
3039019Smckusick  */
3153534Sheideman int (**mfs_vnodeop_p)();
3253534Sheideman struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
3353534Sheideman 	{ &vop_default_desc, vn_default_error },
3453534Sheideman 	{ &vop_lookup_desc, mfs_lookup },		/* lookup */
3553534Sheideman 	{ &vop_create_desc, mfs_create },		/* create */
3654457Smckusick 	{ &vop_mknod_desc, mfs_mknod },			/* mknod */
3754457Smckusick 	{ &vop_open_desc, mfs_open },			/* open */
3854457Smckusick 	{ &vop_close_desc, mfs_close },			/* close */
3953534Sheideman 	{ &vop_access_desc, mfs_access },		/* access */
4053534Sheideman 	{ &vop_getattr_desc, mfs_getattr },		/* getattr */
4153534Sheideman 	{ &vop_setattr_desc, mfs_setattr },		/* setattr */
4254457Smckusick 	{ &vop_read_desc, mfs_read },			/* read */
4354457Smckusick 	{ &vop_write_desc, mfs_write },			/* write */
4454457Smckusick 	{ &vop_ioctl_desc, mfs_ioctl },			/* ioctl */
4553534Sheideman 	{ &vop_select_desc, mfs_select },		/* select */
4668415Smckusick 	{ &vop_revoke_desc, mfs_revoke },		/* revoke */
4754457Smckusick 	{ &vop_mmap_desc, mfs_mmap },			/* mmap */
4854458Smckusick 	{ &vop_fsync_desc, spec_fsync },		/* fsync */
4954457Smckusick 	{ &vop_seek_desc, mfs_seek },			/* seek */
5053534Sheideman 	{ &vop_remove_desc, mfs_remove },		/* remove */
5154457Smckusick 	{ &vop_link_desc, mfs_link },			/* link */
5253534Sheideman 	{ &vop_rename_desc, mfs_rename },		/* rename */
5354457Smckusick 	{ &vop_mkdir_desc, mfs_mkdir },			/* mkdir */
5454457Smckusick 	{ &vop_rmdir_desc, mfs_rmdir },			/* rmdir */
5553534Sheideman 	{ &vop_symlink_desc, mfs_symlink },		/* symlink */
5653534Sheideman 	{ &vop_readdir_desc, mfs_readdir },		/* readdir */
5753534Sheideman 	{ &vop_readlink_desc, mfs_readlink },		/* readlink */
5853534Sheideman 	{ &vop_abortop_desc, mfs_abortop },		/* abortop */
5953534Sheideman 	{ &vop_inactive_desc, mfs_inactive },		/* inactive */
6053534Sheideman 	{ &vop_reclaim_desc, mfs_reclaim },		/* reclaim */
6154457Smckusick 	{ &vop_lock_desc, mfs_lock },			/* lock */
6253534Sheideman 	{ &vop_unlock_desc, mfs_unlock },		/* unlock */
6354457Smckusick 	{ &vop_bmap_desc, mfs_bmap },			/* bmap */
6453534Sheideman 	{ &vop_strategy_desc, mfs_strategy },		/* strategy */
6554457Smckusick 	{ &vop_print_desc, mfs_print },			/* print */
6653534Sheideman 	{ &vop_islocked_desc, mfs_islocked },		/* islocked */
6764179Smckusick 	{ &vop_pathconf_desc, mfs_pathconf },		/* pathconf */
6853534Sheideman 	{ &vop_advlock_desc, mfs_advlock },		/* advlock */
6953534Sheideman 	{ &vop_blkatoff_desc, mfs_blkatoff },		/* blkatoff */
7053534Sheideman 	{ &vop_valloc_desc, mfs_valloc },		/* valloc */
7154457Smckusick 	{ &vop_vfree_desc, mfs_vfree },			/* vfree */
7253534Sheideman 	{ &vop_truncate_desc, mfs_truncate },		/* truncate */
7353534Sheideman 	{ &vop_update_desc, mfs_update },		/* update */
7453534Sheideman 	{ &vop_bwrite_desc, mfs_bwrite },		/* bwrite */
7553534Sheideman 	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
7639019Smckusick };
7753534Sheideman struct vnodeopv_desc mfs_vnodeop_opv_desc =
7853534Sheideman 	{ &mfs_vnodeop_p, mfs_vnodeop_entries };
7939019Smckusick 
8039019Smckusick /*
8139019Smckusick  * Vnode Operations.
8239019Smckusick  *
8339019Smckusick  * Open called to allow memory filesystem to initialize and
8439357Smckusick  * validate before actual IO. Record our process identifier
8539357Smckusick  * so we can tell when we are doing I/O to ourself.
8639019Smckusick  */
8739019Smckusick /* ARGSUSED */
8851477Sbostic int
mfs_open(ap)8954660Smckusick mfs_open(ap)
9054660Smckusick 	struct vop_open_args /* {
9154660Smckusick 		struct vnode *a_vp;
9254660Smckusick 		int  a_mode;
9354660Smckusick 		struct ucred *a_cred;
9454660Smckusick 		struct proc *a_p;
9554660Smckusick 	} */ *ap;
9639019Smckusick {
9739019Smckusick 
9853594Sheideman 	if (ap->a_vp->v_type != VBLK) {
9939019Smckusick 		panic("mfs_ioctl not VBLK");
10039019Smckusick 		/* NOTREACHED */
10139019Smckusick 	}
10239019Smckusick 	return (0);
10339019Smckusick }
10439019Smckusick 
10539019Smckusick /*
10639019Smckusick  * Ioctl operation.
10739019Smckusick  */
10839019Smckusick /* ARGSUSED */
10951477Sbostic int
mfs_ioctl(ap)11054660Smckusick mfs_ioctl(ap)
11154660Smckusick 	struct vop_ioctl_args /* {
11254660Smckusick 		struct vnode *a_vp;
11354660Smckusick 		int  a_command;
11454660Smckusick 		caddr_t  a_data;
11554660Smckusick 		int  a_fflag;
11654660Smckusick 		struct ucred *a_cred;
11754660Smckusick 		struct proc *a_p;
11854660Smckusick 	} */ *ap;
11939019Smckusick {
12039019Smckusick 
12153043Sralph 	return (ENOTTY);
12239019Smckusick }
12339019Smckusick 
12439019Smckusick /*
12539019Smckusick  * Pass I/O requests to the memory filesystem process.
12639019Smckusick  */
12751477Sbostic int
mfs_strategy(ap)12854660Smckusick mfs_strategy(ap)
12954660Smckusick 	struct vop_strategy_args /* {
13054660Smckusick 		struct buf *a_bp;
13154660Smckusick 	} */ *ap;
13239019Smckusick {
13353866Sheideman 	register struct buf *bp = ap->a_bp;
13439822Smckusick 	register struct mfsnode *mfsp;
13539822Smckusick 	struct vnode *vp;
13648038Smckusick 	struct proc *p = curproc;		/* XXX */
13739019Smckusick 
13859485Smckusick 	if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
13939822Smckusick 		panic("mfs_strategy: bad dev");
14039822Smckusick 	mfsp = VTOMFS(vp);
14153043Sralph 	/* check for mini-root access */
14253043Sralph 	if (mfsp->mfs_pid == 0) {
14353043Sralph 		caddr_t base;
14453043Sralph 
14553866Sheideman 		base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
14653866Sheideman 		if (bp->b_flags & B_READ)
14764545Sbostic 			bcopy(base, bp->b_data, bp->b_bcount);
14853043Sralph 		else
14964545Sbostic 			bcopy(bp->b_data, base, bp->b_bcount);
15053866Sheideman 		biodone(bp);
15153043Sralph 	} else if (mfsp->mfs_pid == p->p_pid) {
15253866Sheideman 		mfs_doio(bp, mfsp->mfs_baseoff);
15339019Smckusick 	} else {
15456392Smckusick 		bp->b_actf = mfsp->mfs_buflist;
15553866Sheideman 		mfsp->mfs_buflist = bp;
15639822Smckusick 		wakeup((caddr_t)vp);
15739019Smckusick 	}
15839357Smckusick 	return (0);
15939019Smckusick }
16039019Smckusick 
16139019Smckusick /*
16239019Smckusick  * Memory file system I/O.
16339019Smckusick  *
16443412Shibler  * Trivial on the HP since buffer has already been mapping into KVA space.
16543412Shibler  */
16651477Sbostic void
mfs_doio(bp,base)16743412Shibler mfs_doio(bp, base)
16843412Shibler 	register struct buf *bp;
16943412Shibler 	caddr_t base;
17043412Shibler {
17153043Sralph 
17243412Shibler 	base += (bp->b_blkno << DEV_BSHIFT);
17343412Shibler 	if (bp->b_flags & B_READ)
17464545Sbostic 		bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
17543412Shibler 	else
17664545Sbostic 		bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
17743412Shibler 	if (bp->b_error)
17843412Shibler 		bp->b_flags |= B_ERROR;
17943412Shibler 	biodone(bp);
18043412Shibler }
18143412Shibler 
18243412Shibler /*
18339680Smckusick  * This is a noop, simply returning what one has been given.
18439680Smckusick  */
18551477Sbostic int
mfs_bmap(ap)18654660Smckusick mfs_bmap(ap)
18754660Smckusick 	struct vop_bmap_args /* {
18854660Smckusick 		struct vnode *a_vp;
18968555Smckusick 		ufs_daddr_t  a_bn;
19054660Smckusick 		struct vnode **a_vpp;
19168555Smckusick 		ufs_daddr_t *a_bnp;
19256454Smargo 		int *a_runp;
19354660Smckusick 	} */ *ap;
19439680Smckusick {
19539680Smckusick 
19653594Sheideman 	if (ap->a_vpp != NULL)
19753594Sheideman 		*ap->a_vpp = ap->a_vp;
19853594Sheideman 	if (ap->a_bnp != NULL)
19953594Sheideman 		*ap->a_bnp = ap->a_bn;
20068407Smckusick 	if (ap->a_runp != NULL)
20168407Smckusick 		*ap->a_runp = 0;
20239680Smckusick 	return (0);
20339680Smckusick }
20439680Smckusick 
20539680Smckusick /*
20639019Smckusick  * Memory filesystem close routine
20739019Smckusick  */
20839019Smckusick /* ARGSUSED */
20951477Sbostic int
mfs_close(ap)21054660Smckusick mfs_close(ap)
21154660Smckusick 	struct vop_close_args /* {
21254660Smckusick 		struct vnode *a_vp;
21354660Smckusick 		int  a_fflag;
21454660Smckusick 		struct ucred *a_cred;
21554660Smckusick 		struct proc *a_p;
21654660Smckusick 	} */ *ap;
21739019Smckusick {
21853866Sheideman 	register struct vnode *vp = ap->a_vp;
21953866Sheideman 	register struct mfsnode *mfsp = VTOMFS(vp);
22039438Smckusick 	register struct buf *bp;
22154458Smckusick 	int error;
22239019Smckusick 
22339019Smckusick 	/*
22439438Smckusick 	 * Finish any pending I/O requests.
22539438Smckusick 	 */
22639438Smckusick 	while (bp = mfsp->mfs_buflist) {
22756392Smckusick 		mfsp->mfs_buflist = bp->b_actf;
22839438Smckusick 		mfs_doio(bp, mfsp->mfs_baseoff);
22939438Smckusick 		wakeup((caddr_t)bp);
23039438Smckusick 	}
23139438Smckusick 	/*
23239019Smckusick 	 * On last close of a memory filesystem
23339019Smckusick 	 * we must invalidate any in core blocks, so that
23439019Smckusick 	 * we can, free up its vnode.
23539019Smckusick 	 */
23657807Smckusick 	if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
23754458Smckusick 		return (error);
23839019Smckusick 	/*
23939438Smckusick 	 * There should be no way to have any more uses of this
24039438Smckusick 	 * vnode, so if we find any other uses, it is a panic.
24139019Smckusick 	 */
24253866Sheideman 	if (vp->v_usecount > 1)
24353866Sheideman 		printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
24453866Sheideman 	if (vp->v_usecount > 1 || mfsp->mfs_buflist)
24539438Smckusick 		panic("mfs_close");
24639019Smckusick 	/*
24739019Smckusick 	 * Send a request to the filesystem server to exit.
24839019Smckusick 	 */
24939389Smckusick 	mfsp->mfs_buflist = (struct buf *)(-1);
25053866Sheideman 	wakeup((caddr_t)vp);
25139019Smckusick 	return (0);
25239019Smckusick }
25339019Smckusick 
25439019Smckusick /*
25539389Smckusick  * Memory filesystem inactive routine
25639389Smckusick  */
25739389Smckusick /* ARGSUSED */
25851477Sbostic int
mfs_inactive(ap)25954660Smckusick mfs_inactive(ap)
26054660Smckusick 	struct vop_inactive_args /* {
26154660Smckusick 		struct vnode *a_vp;
262*69611Smckusick 		struct proc *a_p;
26354660Smckusick 	} */ *ap;
26439389Smckusick {
265*69611Smckusick 	struct vnode *vp = ap->a_vp;
266*69611Smckusick 	struct mfsnode *mfsp = VTOMFS(vp);
26739389Smckusick 
26853197Sralph 	if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
26953197Sralph 		panic("mfs_inactive: not inactive (mfs_buflist %x)",
27053197Sralph 			mfsp->mfs_buflist);
271*69611Smckusick 	VOP_UNLOCK(vp, 0, ap->a_p);
27239389Smckusick 	return (0);
27339389Smckusick }
27439389Smckusick 
27539389Smckusick /*
27651981Smckusick  * Reclaim a memory filesystem devvp so that it can be reused.
27751981Smckusick  */
27851981Smckusick int
mfs_reclaim(ap)27954660Smckusick mfs_reclaim(ap)
28054660Smckusick 	struct vop_reclaim_args /* {
28154660Smckusick 		struct vnode *a_vp;
28254660Smckusick 	} */ *ap;
28351981Smckusick {
28467408Smckusick 	register struct vnode *vp = ap->a_vp;
28551981Smckusick 
28667408Smckusick 	FREE(vp->v_data, M_MFSNODE);
28767408Smckusick 	vp->v_data = NULL;
28851981Smckusick 	return (0);
28951981Smckusick }
29051981Smckusick 
29151981Smckusick /*
29239677Smckusick  * Print out the contents of an mfsnode.
29339677Smckusick  */
29451477Sbostic int
mfs_print(ap)29554660Smckusick mfs_print(ap)
29654660Smckusick 	struct vop_print_args /* {
29754660Smckusick 		struct vnode *a_vp;
29854660Smckusick 	} */ *ap;
29939677Smckusick {
30053594Sheideman 	register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
30139677Smckusick 
30239677Smckusick 	printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
30339677Smckusick 		mfsp->mfs_baseoff, mfsp->mfs_size);
30451477Sbostic 	return (0);
30539677Smckusick }
30639677Smckusick 
30739677Smckusick /*
30839019Smckusick  * Block device bad operation
30939019Smckusick  */
31051477Sbostic int
mfs_badop()31139019Smckusick mfs_badop()
31239019Smckusick {
31339019Smckusick 
31439389Smckusick 	panic("mfs_badop called\n");
31539389Smckusick 	/* NOTREACHED */
31639019Smckusick }
31739019Smckusick 
31839019Smckusick /*
31939019Smckusick  * Memory based filesystem initialization.
32039019Smckusick  */
32168678Smckusick mfs_init(vfsp)
32268678Smckusick 	struct vfsconf *vfsp;
32339019Smckusick {
32439019Smckusick 
32568120Smckusick 	return;
32639019Smckusick }
327