[unix-history] / usr / src / sys / ufs / lfs / lfs_vfsops.c

/*	lfs_vfsops.c	6.4	84/06/26	*/

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

smount()
{
	register struct a {
		char	*fspec;
		char	*freg;
		int	ronly;
	} *uap;
	dev_t dev;
	register struct inode *ip;
	register struct fs *fs;
	register char *cp;

	uap = (struct a *)u.u_ap;
	u.u_error = getmdev(&dev);
	if (u.u_error)
		return;
	u.u_dirp = (caddr_t)uap->freg;
	ip = namei(uchar, LOOKUP | NOCACHE, 1);
	if (ip == NULL)
		return;
	if (ip->i_count!=1 || (ip->i_mode&IFMT) != IFDIR) {
		iput(ip);
		u.u_error = EBUSY;
		return;
	}
	fs = mountfs(dev, uap->ronly, ip);
	if (fs == 0)
		return;
	u.u_dirp = uap->freg;
	for (cp = fs->fs_fsmnt; cp < &fs->fs_fsmnt[sizeof(fs->fs_fsmnt) - 2]; )
		if ((*cp++ = uchar()) == 0)
			u.u_dirp--;		/* get 0 again */
	*cp = 0;
}

/* 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;

	error =
	    (*bdevsw[major(dev)].d_open)(dev, ronly ? FREAD : FREAD|FWRITE);
	if (error)
		goto out;
	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;
			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[i / fs->fs_frag] = (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);
	u.u_error = error;
	return (0);
}

umount()
{
	struct a {
		char	*fspec;
	};

	u.u_error = unmount1(0);
}

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

	error = getmdev(&dev);
	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)
	dev_t *pdev;
{
	dev_t dev;
	register struct inode *ip;

	if (!suser())
		return (u.u_error);
	ip = namei(uchar, LOOKUP, 1);
	if (ip == NULL)
		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
1c281610	1	/* lfs_vfsops.c 6.4 84/06/26 */
71e4e98b SL	2
	3	#include "../h/param.h"
	4	#include "../h/systm.h"
	5	#include "../h/dir.h"
	6	#include "../h/user.h"
	7	#include "../h/inode.h"
	8	#include "../h/proc.h"
	9	#include "../h/fs.h"
	10	#include "../h/buf.h"
	11	#include "../h/mount.h"
	12	#include "../h/file.h"
	13	#include "../h/nami.h"
	14	#include "../h/conf.h"
	15
	16	smount()
	17	{
	18	register struct a {
	19	char *fspec;
	20	char *freg;
	21	int ronly;
	22	} *uap;
	23	dev_t dev;
	24	register struct inode *ip;
	25	register struct fs *fs;
	26	register char *cp;
	27
	28	uap = (struct a *)u.u_ap;
	29	u.u_error = getmdev(&dev);
	30	if (u.u_error)
	31	return;
	32	u.u_dirp = (caddr_t)uap->freg;
f93197fc	33	ip = namei(uchar, LOOKUP \| NOCACHE, 1);
71e4e98b SL	34	if (ip == NULL)
	35	return;
	36	if (ip->i_count!=1 \|\| (ip->i_mode&IFMT) != IFDIR) {
	37	iput(ip);
	38	u.u_error = EBUSY;
	39	return;
	40	}
	41	fs = mountfs(dev, uap->ronly, ip);
	42	if (fs == 0)
	43	return;
	44	u.u_dirp = uap->freg;
	45	for (cp = fs->fs_fsmnt; cp < &fs->fs_fsmnt[sizeof(fs->fs_fsmnt) - 2]; )
	46	if ((*cp++ = uchar()) == 0)
	47	u.u_dirp--; /* get 0 again */
	48	*cp = 0;
	49	}
	50
71e4e98b SL	51	/* this routine has races if running twice */
	52	struct fs *
	53	mountfs(dev, ronly, ip)
	54	dev_t dev;
	55	int ronly;
	56	struct inode *ip;
	57	{
	58	register struct mount *mp = 0;
	59	struct buf *tp = 0;
	60	register struct buf *bp = 0;
	61	register struct fs *fs;
	62	int blks;
	63	caddr_t space;
	64	int i, size;
1c281610	65	register error;
71e4e98b	66
1c281610	67	error =
71e4e98b	68	(*bdevsw[major(dev)].d_open)(dev, ronly ? FREAD : FREAD\|FWRITE);
1c281610	69	if (error)
71e4e98b	70	goto out;
71e4e98b SL	71	tp = bread(dev, SBLOCK, SBSIZE);
	72	if (tp->b_flags & B_ERROR)
	73	goto out;
	74	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
	75	if (mp->m_bufp != 0 && dev == mp->m_dev) {
	76	mp = 0;
1c281610	77	error = EBUSY;
71e4e98b SL	78	goto out;
	79	}
	80	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
	81	if (mp->m_bufp == 0)
	82	goto found;
	83	mp = 0;
1c281610	84	error = EMFILE; /* needs translation */
71e4e98b SL	85	goto out;
	86	found:
	87	mp->m_bufp = tp; /* just to reserve this slot */
	88	mp->m_dev = NODEV;
	89	fs = tp->b_un.b_fs;
1c281610 MK	90	if (fs->fs_magic != FS_MAGIC \|\| fs->fs_bsize > MAXBSIZE
	91	\|\| fs->fs_bsize < sizeof(struct fs)) {
	92	error = EINVAL; /* also needs translation */
	93	goto out;
	94	}
71e4e98b SL	95	bp = geteblk((int)fs->fs_sbsize);
	96	mp->m_bufp = bp;
	97	bcopy((caddr_t)tp->b_un.b_addr, (caddr_t)bp->b_un.b_addr,
	98	(u_int)fs->fs_sbsize);
	99	brelse(tp);
	100	tp = 0;
	101	fs = bp->b_un.b_fs;
71e4e98b SL	102	fs->fs_ronly = (ronly != 0);
	103	if (ronly == 0)
	104	fs->fs_fmod = 1;
	105	blks = howmany(fs->fs_cssize, fs->fs_fsize);
	106	space = wmemall(vmemall, (int)fs->fs_cssize);
1c281610 MK	107	if (space == 0) {
1c281610 MK	108	error = ENOMEM;
71e4e98b	109	goto out;
1c281610	110	}
71e4e98b SL	111	for (i = 0; i < blks; i += fs->fs_frag) {
	112	size = fs->fs_bsize;
	113	if (i + fs->fs_frag > blks)
	114	size = (blks - i) * fs->fs_fsize;
	115	tp = bread(dev, fsbtodb(fs, fs->fs_csaddr + i), size);
	116	if (tp->b_flags&B_ERROR) {
	117	wmemfree(space, (int)fs->fs_cssize);
	118	goto out;
	119	}
	120	bcopy((caddr_t)tp->b_un.b_addr, space, (u_int)size);
	121	fs->fs_csp[i / fs->fs_frag] = (struct csum *)space;
	122	space += size;
	123	brelse(tp);
	124	tp = 0;
	125	}
	126	mp->m_inodp = ip;
	127	mp->m_dev = dev;
	128	if (ip) {
	129	ip->i_flag \|= IMOUNT;
	130	iunlock(ip);
	131	}
	132	return (fs);
	133	out:
1c281610 MK	134	if (error == 0)
1c281610 MK	135	error = EIO;
71e4e98b SL	136	if (ip)
	137	iput(ip);
	138	if (mp)
	139	mp->m_bufp = 0;
	140	if (bp)
	141	brelse(bp);
	142	if (tp)
	143	brelse(tp);
1c281610	144	u.u_error = error;
71e4e98b SL	145	return (0);
	146	}
	147
	148	umount()
	149	{
	150	struct a {
	151	char *fspec;
	152	};
	153
	154	u.u_error = unmount1(0);
	155	}
	156
	157	unmount1(forcibly)
	158	int forcibly;
	159	{
	160	dev_t dev;
	161	register struct mount *mp;
	162	int stillopen, flag, error;
	163	register struct inode *ip;
	164	register struct fs *fs;
	165
	166	error = getmdev(&dev);
	167	if (error)
	168	return (error);
	169	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
	170	if (mp->m_bufp != NULL && dev == mp->m_dev)
	171	goto found;
	172	return (EINVAL);
	173	found:
	174	xumount(dev); /* remove unused sticky files from text table */
f93197fc	175	nchinval(dev); /* flush the name cache */
71e4e98b SL	176	update();
	177	#ifdef QUOTA
	178	if ((stillopen = iflush(dev, mp->m_qinod)) < 0 && !forcibly)
	179	#else
	180	if ((stillopen = iflush(dev)) < 0 && !forcibly)
	181	#endif
	182	return (EBUSY);
	183	if (stillopen < 0)
	184	return (EBUSY); /* XXX */
	185	#ifdef QUOTA
	186	closedq(mp);
	187	/*
	188	* Here we have to iflush again to get rid of the quota inode.
	189	* A drag, but it would be ugly to cheat, & this doesn't happen often
	190	*/
	191	(void)iflush(dev, (struct inode *)NULL);
	192	#endif
	193	ip = mp->m_inodp;
	194	ip->i_flag &= ~IMOUNT;
	195	irele(ip);
	196	fs = mp->m_bufp->b_un.b_fs;
	197	wmemfree((caddr_t)fs->fs_csp[0], (int)fs->fs_cssize);
	198	flag = !fs->fs_ronly;
	199	brelse(mp->m_bufp);
	200	mp->m_bufp = 0;
	201	mp->m_dev = 0;
	202	mpurge(mp - &mount[0]);
	203	if (!stillopen) {
	204	(*bdevsw[major(dev)].d_close)(dev, flag);
	205	binval(dev);
	206	}
	207	return (0);
	208	}
	209
	210	sbupdate(mp)
	211	struct mount *mp;
	212	{
	213	register struct fs *fs = mp->m_bufp->b_un.b_fs;
	214	register struct buf *bp;
	215	int blks;
	216	caddr_t space;
	217	int i, size;
	218
	219	bp = getblk(mp->m_dev, SBLOCK, (int)fs->fs_sbsize);
	220	bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
	221	bwrite(bp);
	222	blks = howmany(fs->fs_cssize, fs->fs_fsize);
	223	space = (caddr_t)fs->fs_csp[0];
	224	for (i = 0; i < blks; i += fs->fs_frag) {
	225	size = fs->fs_bsize;
	226	if (i + fs->fs_frag > blks)
	227	size = (blks - i) * fs->fs_fsize;
	228	bp = getblk(mp->m_dev, fsbtodb(fs, fs->fs_csaddr + i), size);
	229	bcopy(space, bp->b_un.b_addr, (u_int)size);
	230	space += size;
	231	bwrite(bp);
	232	}
	233	}
	234
	235	/*
	236	* Common code for mount and umount.
	237	* Check that the user's argument is a reasonable
	238	* thing on which to mount, and return the device number if so.
	239	*/
240	getmdev(pdev)
241	dev_t *pdev;
242	{
243	dev_t dev;
244	register struct inode *ip;
245
246	if (!suser())
247	return (u.u_error);
248	ip = namei(uchar, LOOKUP, 1);
249	if (ip == NULL)
250	return (u.u_error);
e95cdf5c MK	251	if ((ip->i_mode&IFMT) != IFBLK) {
e95cdf5c MK	252	iput(ip);
71e4e98b	253	return (ENOTBLK);
e95cdf5c	254	}
71e4e98b	255	dev = (dev_t)ip->i_rdev;
e95cdf5c	256	iput(ip);
71e4e98b SL	257	if (major(dev) >= nblkdev)
71e4e98b SL	258	return (ENXIO);
71e4e98b SL	259	*pdev = dev;
	260	return (0);
	261	}