[unix-history] / usr / src / sys / ufs / ffs / ffs_vfsops.c

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)ffs_vfsops.c	6.13 (Berkeley) %G%
 */

#include "param.h"
#include "systm.h"
#include "dir.h"
#include "user.h"
#include "inode.h"
#include "proc.h"
#include "fs.h"
#include "buf.h"
#include "mount.h"
#include "file.h"
#include "conf.h"

smount()
{
	register struct a {
		char	*fspec;
		char	*freg;
		int	ronly;
	} *uap = (struct a *)u.u_ap;
	dev_t dev;
	register struct inode *ip;
	register struct fs *fs;
	register struct nameidata *ndp = &u.u_nd;
	u_int len;

	u.u_error = getmdev(&dev, uap->fspec);
	if (u.u_error)
		return;
	ndp->ni_nameiop = LOOKUP | NOCACHE | FOLLOW;
	ndp->ni_segflg = UIO_USERSPACE;
	ndp->ni_dirp = (caddr_t)uap->freg;
	ip = namei(ndp);
	if (ip == NULL)
		return;
	if (ip->i_count != 1) {
		iput(ip);
		u.u_error = EBUSY;
		return;
	}
	if ((ip->i_mode&IFMT) != IFDIR) {
		iput(ip);
		u.u_error = ENOTDIR;
		return;
	}
	fs = mountfs(dev, uap->ronly, ip);
	if (fs == 0)
		return;
	(void) copyinstr(uap->freg, fs->fs_fsmnt, sizeof(fs->fs_fsmnt)-1, &len);
	bzero(fs->fs_fsmnt + len, sizeof (fs->fs_fsmnt) - len);
}

/* this routine has races if running twice */
struct fs *
mountfs(dev, ronly, ip)
	dev_t dev;
	int ronly;
	struct inode *ip;
{
	register struct mount *mp = 0;
	struct buf *tp = 0;
	register struct buf *bp = 0;
	register struct fs *fs;
	int blks;
	caddr_t space;
	int i, size;
	register error;
	int needclose = 0;

	error =
	    (*bdevsw[major(dev)].d_open)(dev, ronly ? FREAD : FREAD|FWRITE);
	if (error)
		goto out;
	needclose = 1;
	tp = bread(dev, SBLOCK, SBSIZE);
	if (tp->b_flags & B_ERROR)
		goto out;
	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
		if (mp->m_bufp != 0 && dev == mp->m_dev) {
			mp = 0;
			error = EBUSY;
			needclose = 0;
			goto out;
		}
	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
		if (mp->m_bufp == 0)
			goto found;
	mp = 0;
	error = EMFILE;		/* needs translation */
	goto out;
found:
	mp->m_bufp = tp;	/* just to reserve this slot */
	mp->m_dev = NODEV;
	fs = tp->b_un.b_fs;
	if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE
	    || fs->fs_bsize < sizeof(struct fs)) {
		error = EINVAL;		/* also needs translation */
		goto out;
	}
	bp = geteblk((int)fs->fs_sbsize);
	mp->m_bufp = bp;
	bcopy((caddr_t)tp->b_un.b_addr, (caddr_t)bp->b_un.b_addr,
	   (u_int)fs->fs_sbsize);
	brelse(tp);
	tp = 0;
	fs = bp->b_un.b_fs;
	fs->fs_ronly = (ronly != 0);
	if (ronly == 0)
		fs->fs_fmod = 1;
	blks = howmany(fs->fs_cssize, fs->fs_fsize);
	space = wmemall(vmemall, (int)fs->fs_cssize);
	if (space == 0) {
		error = ENOMEM;
		goto out;
	}
	for (i = 0; i < blks; i += fs->fs_frag) {
		size = fs->fs_bsize;
		if (i + fs->fs_frag > blks)
			size = (blks - i) * fs->fs_fsize;
		tp = bread(dev, fsbtodb(fs, fs->fs_csaddr + i), size);
		if (tp->b_flags&B_ERROR) {
			wmemfree(space, (int)fs->fs_cssize);
			goto out;
		}
		bcopy((caddr_t)tp->b_un.b_addr, space, (u_int)size);
		fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
		space += size;
		brelse(tp);
		tp = 0;
	}
	mp->m_inodp = ip;
	mp->m_dev = dev;
	if (ip) {
		ip->i_flag |= IMOUNT;
		iunlock(ip);
	}
	return (fs);
out:
	if (error == 0)
		error = EIO;
	if (ip)
		iput(ip);
	if (mp)
		mp->m_bufp = 0;
	if (bp)
		brelse(bp);
	if (tp)
		brelse(tp);
	if (needclose) {
		(*bdevsw[major(dev)].d_close)(dev, ronly? FREAD : FREAD|FWRITE);
		binval(dev);
	}
	u.u_error = error;
	return (0);
}

umount()
{
	struct a {
		char	*fspec;
	} *uap = (struct a *)u.u_ap;

	u.u_error = unmount1(uap->fspec, 0);
}

unmount1(fname, forcibly)
	caddr_t fname;
	int forcibly;
{
	dev_t dev;
	register struct mount *mp;
	int stillopen, flag, error;
	register struct inode *ip;
	register struct fs *fs;

	error = getmdev(&dev, fname);
	if (error)
		return (error);
	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
		if (mp->m_bufp != NULL && dev == mp->m_dev)
			goto found;
	return (EINVAL);
found:
	xumount(dev);	/* remove unused sticky files from text table */
	nchinval(dev);	/* flush the name cache */
	update();
#ifdef QUOTA
	if ((stillopen = iflush(dev, mp->m_qinod)) < 0 && !forcibly)
#else
	if ((stillopen = iflush(dev)) < 0 && !forcibly)
#endif
		return (EBUSY);
	if (stillopen < 0)
		return (EBUSY);			/* XXX */
#ifdef QUOTA
	closedq(mp);
	/*
	 * Here we have to iflush again to get rid of the quota inode.
	 * A drag, but it would be ugly to cheat, & this doesn't happen often
	 */
	(void)iflush(dev, (struct inode *)NULL);
#endif
	ip = mp->m_inodp;
	ip->i_flag &= ~IMOUNT;
	irele(ip);
	fs = mp->m_bufp->b_un.b_fs;
	wmemfree((caddr_t)fs->fs_csp[0], (int)fs->fs_cssize);
	flag = !fs->fs_ronly;
	brelse(mp->m_bufp);
	mp->m_bufp = 0;
	mp->m_dev = 0;
	mpurge(mp - &mount[0]);
	if (!stillopen) {
		(*bdevsw[major(dev)].d_close)(dev, flag);
		binval(dev);
	}
	return (0);
}

sbupdate(mp)
	struct mount *mp;
{
	register struct fs *fs = mp->m_bufp->b_un.b_fs;
	register struct buf *bp;
	int blks;
	caddr_t space;
	int i, size;

	bp = getblk(mp->m_dev, SBLOCK, (int)fs->fs_sbsize);
	bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
	bwrite(bp);
	blks = howmany(fs->fs_cssize, fs->fs_fsize);
	space = (caddr_t)fs->fs_csp[0];
	for (i = 0; i < blks; i += fs->fs_frag) {
		size = fs->fs_bsize;
		if (i + fs->fs_frag > blks)
			size = (blks - i) * fs->fs_fsize;
		bp = getblk(mp->m_dev, fsbtodb(fs, fs->fs_csaddr + i), size);
		bcopy(space, bp->b_un.b_addr, (u_int)size);
		space += size;
		bwrite(bp);
	}
}

/*
 * Common code for mount and umount.
 * Check that the user's argument is a reasonable
 * thing on which to mount, and return the device number if so.
 */
getmdev(pdev, fname)
	caddr_t fname;
	dev_t *pdev;
{
	dev_t dev;
	register struct inode *ip;
	register struct nameidata *ndp = &u.u_nd;

	if (!suser())
		return (u.u_error);
	ndp->ni_nameiop = LOOKUP | FOLLOW;
	ndp->ni_segflg = UIO_USERSPACE;
	ndp->ni_dirp = fname;
	ip = namei(ndp);
	if (ip == NULL) {
		if (u.u_error == ENOENT)
			return (ENODEV); /* needs translation */
		return (u.u_error);
	}
	if ((ip->i_mode&IFMT) != IFBLK) {
		iput(ip);
		return (ENOTBLK);
	}
	dev = (dev_t)ip->i_rdev;
	iput(ip);
	if (major(dev) >= nblkdev)
		return (ENXIO);
	*pdev = dev;
	return (0);
}
Commit	Line	Data
da7c5cc6 KM	1	/*
	2	* Copyright (c) 1982 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*
86b729dd	6	* @(#)ffs_vfsops.c 6.13 (Berkeley) %G%
da7c5cc6	7	*/
71e4e98b	8
94368568 JB	9	#include "param.h"
	10	#include "systm.h"
	11	#include "dir.h"
	12	#include "user.h"
	13	#include "inode.h"
	14	#include "proc.h"
	15	#include "fs.h"
	16	#include "buf.h"
	17	#include "mount.h"
	18	#include "file.h"
	19	#include "conf.h"
71e4e98b SL	20
	21	smount()
	22	{
	23	register struct a {
	24	char *fspec;
	25	char *freg;
	26	int ronly;
715baff1	27	} uap = (struct a )u.u_ap;
71e4e98b SL	28	dev_t dev;
	29	register struct inode *ip;
	30	register struct fs *fs;
715baff1	31	register struct nameidata *ndp = &u.u_nd;
76335100	32	u_int len;
71e4e98b	33
715baff1	34	u.u_error = getmdev(&dev, uap->fspec);
71e4e98b SL	35	if (u.u_error)
71e4e98b SL	36	return;
715baff1 KM	37	ndp->ni_nameiop = LOOKUP \| NOCACHE \| FOLLOW;
	38	ndp->ni_segflg = UIO_USERSPACE;
	39	ndp->ni_dirp = (caddr_t)uap->freg;
	40	ip = namei(ndp);
71e4e98b SL	41	if (ip == NULL)
71e4e98b SL	42	return;
6d07f4cd	43	if (ip->i_count != 1) {
71e4e98b SL	44	iput(ip);
	45	u.u_error = EBUSY;
	46	return;
	47	}
6d07f4cd KM	48	if ((ip->i_mode&IFMT) != IFDIR) {
	49	iput(ip);
	50	u.u_error = ENOTDIR;
	51	return;
	52	}
71e4e98b SL	53	fs = mountfs(dev, uap->ronly, ip);
	54	if (fs == 0)
	55	return;
76335100	56	(void) copyinstr(uap->freg, fs->fs_fsmnt, sizeof(fs->fs_fsmnt)-1, &len);
32af08ce	57	bzero(fs->fs_fsmnt + len, sizeof (fs->fs_fsmnt) - len);
71e4e98b SL	58	}
71e4e98b SL	59
71e4e98b SL	60	/* this routine has races if running twice */
	61	struct fs *
	62	mountfs(dev, ronly, ip)
	63	dev_t dev;
	64	int ronly;
	65	struct inode *ip;
	66	{
	67	register struct mount *mp = 0;
	68	struct buf *tp = 0;
	69	register struct buf *bp = 0;
	70	register struct fs *fs;
	71	int blks;
	72	caddr_t space;
	73	int i, size;
1c281610	74	register error;
6d07f4cd	75	int needclose = 0;
71e4e98b	76
1c281610	77	error =
71e4e98b	78	(*bdevsw[major(dev)].d_open)(dev, ronly ? FREAD : FREAD\|FWRITE);
1c281610	79	if (error)
71e4e98b	80	goto out;
6d07f4cd	81	needclose = 1;
71e4e98b SL	82	tp = bread(dev, SBLOCK, SBSIZE);
	83	if (tp->b_flags & B_ERROR)
	84	goto out;
	85	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
	86	if (mp->m_bufp != 0 && dev == mp->m_dev) {
	87	mp = 0;
1c281610	88	error = EBUSY;
86b729dd	89	needclose = 0;
71e4e98b SL	90	goto out;
	91	}
	92	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
	93	if (mp->m_bufp == 0)
	94	goto found;
	95	mp = 0;
1c281610	96	error = EMFILE; /* needs translation */
71e4e98b SL	97	goto out;
	98	found:
	99	mp->m_bufp = tp; /* just to reserve this slot */
	100	mp->m_dev = NODEV;
	101	fs = tp->b_un.b_fs;
1c281610 MK	102	if (fs->fs_magic != FS_MAGIC \|\| fs->fs_bsize > MAXBSIZE
	103	\|\| fs->fs_bsize < sizeof(struct fs)) {
	104	error = EINVAL; /* also needs translation */
	105	goto out;
	106	}
71e4e98b SL	107	bp = geteblk((int)fs->fs_sbsize);
	108	mp->m_bufp = bp;
	109	bcopy((caddr_t)tp->b_un.b_addr, (caddr_t)bp->b_un.b_addr,
	110	(u_int)fs->fs_sbsize);
	111	brelse(tp);
	112	tp = 0;
	113	fs = bp->b_un.b_fs;
71e4e98b SL	114	fs->fs_ronly = (ronly != 0);
	115	if (ronly == 0)
	116	fs->fs_fmod = 1;
	117	blks = howmany(fs->fs_cssize, fs->fs_fsize);
	118	space = wmemall(vmemall, (int)fs->fs_cssize);
1c281610 MK	119	if (space == 0) {
1c281610 MK	120	error = ENOMEM;
71e4e98b	121	goto out;
1c281610	122	}
71e4e98b SL	123	for (i = 0; i < blks; i += fs->fs_frag) {
	124	size = fs->fs_bsize;
	125	if (i + fs->fs_frag > blks)
	126	size = (blks - i) * fs->fs_fsize;
	127	tp = bread(dev, fsbtodb(fs, fs->fs_csaddr + i), size);
	128	if (tp->b_flags&B_ERROR) {
	129	wmemfree(space, (int)fs->fs_cssize);
	130	goto out;
	131	}
	132	bcopy((caddr_t)tp->b_un.b_addr, space, (u_int)size);
60f9c9e3	133	fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
71e4e98b SL	134	space += size;
	135	brelse(tp);
	136	tp = 0;
	137	}
	138	mp->m_inodp = ip;
	139	mp->m_dev = dev;
	140	if (ip) {
	141	ip->i_flag \|= IMOUNT;
	142	iunlock(ip);
	143	}
	144	return (fs);
	145	out:
1c281610 MK	146	if (error == 0)
1c281610 MK	147	error = EIO;
71e4e98b SL	148	if (ip)
	149	iput(ip);
	150	if (mp)
	151	mp->m_bufp = 0;
	152	if (bp)
	153	brelse(bp);
	154	if (tp)
	155	brelse(tp);
86b729dd MK	156	if (needclose) {
	157	(*bdevsw[major(dev)].d_close)(dev, ronly? FREAD : FREAD\|FWRITE);
	158	binval(dev);
	159	}
1c281610	160	u.u_error = error;
71e4e98b SL	161	return (0);
	162	}
	163
	164	umount()
	165	{
	166	struct a {
	167	char *fspec;
715baff1	168	} uap = (struct a )u.u_ap;
71e4e98b	169
715baff1	170	u.u_error = unmount1(uap->fspec, 0);
71e4e98b SL	171	}
71e4e98b SL	172
715baff1 KM	173	unmount1(fname, forcibly)
715baff1 KM	174	caddr_t fname;
71e4e98b SL	175	int forcibly;
	176	{
	177	dev_t dev;
	178	register struct mount *mp;
	179	int stillopen, flag, error;
	180	register struct inode *ip;
	181	register struct fs *fs;
	182
715baff1	183	error = getmdev(&dev, fname);
71e4e98b SL	184	if (error)
	185	return (error);
	186	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
	187	if (mp->m_bufp != NULL && dev == mp->m_dev)
	188	goto found;
	189	return (EINVAL);
	190	found:
	191	xumount(dev); /* remove unused sticky files from text table */
f93197fc	192	nchinval(dev); /* flush the name cache */
71e4e98b SL	193	update();
	194	#ifdef QUOTA
	195	if ((stillopen = iflush(dev, mp->m_qinod)) < 0 && !forcibly)
	196	#else
	197	if ((stillopen = iflush(dev)) < 0 && !forcibly)
	198	#endif
	199	return (EBUSY);
	200	if (stillopen < 0)
	201	return (EBUSY); /* XXX */
	202	#ifdef QUOTA
	203	closedq(mp);
	204	/*
	205	* Here we have to iflush again to get rid of the quota inode.
	206	* A drag, but it would be ugly to cheat, & this doesn't happen often
	207	*/
	208	(void)iflush(dev, (struct inode *)NULL);
	209	#endif
	210	ip = mp->m_inodp;
	211	ip->i_flag &= ~IMOUNT;
	212	irele(ip);
	213	fs = mp->m_bufp->b_un.b_fs;
	214	wmemfree((caddr_t)fs->fs_csp[0], (int)fs->fs_cssize);
	215	flag = !fs->fs_ronly;
	216	brelse(mp->m_bufp);
	217	mp->m_bufp = 0;
	218	mp->m_dev = 0;
	219	mpurge(mp - &mount[0]);
	220	if (!stillopen) {
	221	(*bdevsw[major(dev)].d_close)(dev, flag);
	222	binval(dev);
	223	}
	224	return (0);
	225	}
	226
	227	sbupdate(mp)
	228	struct mount *mp;
	229	{
	230	register struct fs *fs = mp->m_bufp->b_un.b_fs;
	231	register struct buf *bp;
	232	int blks;
	233	caddr_t space;
	234	int i, size;
	235
	236	bp = getblk(mp->m_dev, SBLOCK, (int)fs->fs_sbsize);
	237	bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
	238	bwrite(bp);
	239	blks = howmany(fs->fs_cssize, fs->fs_fsize);
	240	space = (caddr_t)fs->fs_csp[0];
	241	for (i = 0; i < blks; i += fs->fs_frag) {
	242	size = fs->fs_bsize;
	243	if (i + fs->fs_frag > blks)
	244	size = (blks - i) * fs->fs_fsize;
	245	bp = getblk(mp->m_dev, fsbtodb(fs, fs->fs_csaddr + i), size);
	246	bcopy(space, bp->b_un.b_addr, (u_int)size);
	247	space += size;
	248	bwrite(bp);
	249	}
	250	}
	251
	252	/*
	253	* Common code for mount and umount.
	254	* Check that the user's argument is a reasonable
	255	* thing on which to mount, and return the device number if so.
	256	*/
715baff1 KM	257	getmdev(pdev, fname)
715baff1 KM	258	caddr_t fname;
71e4e98b SL	259	dev_t *pdev;
	260	{
	261	dev_t dev;
	262	register struct inode *ip;
715baff1	263	register struct nameidata *ndp = &u.u_nd;
71e4e98b SL	264
	265	if (!suser())
	266	return (u.u_error);
715baff1 KM	267	ndp->ni_nameiop = LOOKUP \| FOLLOW;
	268	ndp->ni_segflg = UIO_USERSPACE;
	269	ndp->ni_dirp = fname;
	270	ip = namei(ndp);
6d07f4cd KM	271	if (ip == NULL) {
	272	if (u.u_error == ENOENT)
	273	return (ENODEV); /* needs translation */
71e4e98b	274	return (u.u_error);
6d07f4cd	275	}
e95cdf5c MK	276	if ((ip->i_mode&IFMT) != IFBLK) {
e95cdf5c MK	277	iput(ip);
71e4e98b	278	return (ENOTBLK);
e95cdf5c	279	}
71e4e98b	280	dev = (dev_t)ip->i_rdev;
e95cdf5c	281	iput(ip);
71e4e98b SL	282	if (major(dev) >= nblkdev)
71e4e98b SL	283	return (ENXIO);
71e4e98b SL	284	*pdev = dev;
	285	return (0);
	286	}