BSD 4.4 Lite Kernel Sources

1 files changed, 573 insertions, 0 deletions

diff --git a/sys/ufs/lfs/lfs_vfsops.c b/sys/ufs/lfs/lfs_vfsops.c
new file mode 100644
index 0000000..0c8186e
--- /dev/null
+++ b/sys/ufs/lfs/lfs_vfsops.c
@@ -0,0 +1,573 @@
+/*
+ * Copyright (c) 1989, 1991, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)lfs_vfsops.c	8.7 (Berkeley) 4/16/94
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/namei.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/buf.h>
+#include <sys/mbuf.h>
+#include <sys/file.h>
+#include <sys/disklabel.h>
+#include <sys/ioctl.h>
+#include <sys/errno.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+
+#include <miscfs/specfs/specdev.h>
+
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+#include <ufs/ufs/ufsmount.h>
+#include <ufs/ufs/ufs_extern.h>
+
+#include <ufs/lfs/lfs.h>
+#include <ufs/lfs/lfs_extern.h>
+
+int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *));
+
+struct vfsops lfs_vfsops = {
+	lfs_mount,
+	ufs_start,
+	lfs_unmount,
+	ufs_root,
+	ufs_quotactl,
+	lfs_statfs,
+	lfs_sync,
+	lfs_vget,
+	lfs_fhtovp,
+	lfs_vptofh,
+	lfs_init,
+};
+
+int
+lfs_mountroot()
+{
+	panic("lfs_mountroot");		/* XXX -- implement */
+}
+
+/*
+ * VFS Operations.
+ *
+ * mount system call
+ */
+lfs_mount(mp, path, data, ndp, p)
+	register struct mount *mp;
+	char *path;
+	caddr_t data;
+	struct nameidata *ndp;
+	struct proc *p;
+{
+	struct vnode *devvp;
+	struct ufs_args args;
+	struct ufsmount *ump;
+	register struct lfs *fs;				/* LFS */
+	u_int size;
+	int error;
+
+	if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
+		return (error);
+
+	/* Until LFS can do NFS right.		XXX */
+	if (args.export.ex_flags & MNT_EXPORTED)
+		return (EINVAL);
+
+	/*
+	 * If updating, check whether changing from read-only to
+	 * read/write; if there is no device name, that's all we do.
+	 */
+	if (mp->mnt_flag & MNT_UPDATE) {
+		ump = VFSTOUFS(mp);
+#ifdef NOTLFS							/* LFS */
+		fs = ump->um_fs;
+		if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
+			fs->fs_ronly = 0;
+#else
+		fs = ump->um_lfs;
+		if (fs->lfs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
+			fs->lfs_ronly = 0;
+#endif
+		if (args.fspec == 0) {
+			/*
+			 * Process export requests.
+			 */
+			return (vfs_export(mp, &ump->um_export, &args.export));
+		}
+	}
+	/*
+	 * Not an update, or updating the name: look up the name
+	 * and verify that it refers to a sensible block device.
+	 */
+	NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
+	if (error = namei(ndp))
+		return (error);
+	devvp = ndp->ni_vp;
+	if (devvp->v_type != VBLK) {
+		vrele(devvp);
+		return (ENOTBLK);
+	}
+	if (major(devvp->v_rdev) >= nblkdev) {
+		vrele(devvp);
+		return (ENXIO);
+	}
+	if ((mp->mnt_flag & MNT_UPDATE) == 0)
+		error = lfs_mountfs(devvp, mp, p);		/* LFS */
+	else {
+		if (devvp != ump->um_devvp)
+			error = EINVAL;	/* needs translation */
+		else
+			vrele(devvp);
+	}
+	if (error) {
+		vrele(devvp);
+		return (error);
+	}
+	ump = VFSTOUFS(mp);
+	fs = ump->um_lfs;					/* LFS */
+#ifdef NOTLFS							/* LFS */
+	(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
+	bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
+	bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
+	    MNAMELEN);
+	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
+	    &size);
+	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
+	(void) ufs_statfs(mp, &mp->mnt_stat, p);
+#else
+	(void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size);
+	bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size);
+	bcopy((caddr_t)fs->lfs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
+	    MNAMELEN);
+	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
+	    &size);
+	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
+	(void) lfs_statfs(mp, &mp->mnt_stat, p);
+#endif
+	return (0);
+}
+
+/*
+ * Common code for mount and mountroot
+ * LFS specific
+ */
+int
+lfs_mountfs(devvp, mp, p)
+	register struct vnode *devvp;
+	struct mount *mp;
+	struct proc *p;
+{
+	extern struct vnode *rootvp;
+	register struct lfs *fs;
+	register struct ufsmount *ump;
+	struct vnode *vp;
+	struct buf *bp;
+	struct partinfo dpart;
+	dev_t dev;
+	int error, i, ronly, size;
+
+	/*
+	 * Disallow multiple mounts of the same device.
+	 * Disallow mounting of a device that is currently in use
+	 * (except for root, which might share swap device for miniroot).
+	 * Flush out any old buffers remaining from a previous use.
+	 */
+	if (error = vfs_mountedon(devvp))
+		return (error);
+	if (vcount(devvp) > 1 && devvp != rootvp)
+		return (EBUSY);
+	if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
+		return (error);
+
+	ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
+	if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
+		return (error);
+
+	if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
+		size = DEV_BSIZE;
+	else {
+		size = dpart.disklab->d_secsize;
+#ifdef NEVER_USED
+		dpart.part->p_fstype = FS_LFS;
+		dpart.part->p_fsize = fs->lfs_fsize;	/* frag size */
+		dpart.part->p_frag = fs->lfs_frag;	/* frags per block */
+		dpart.part->p_cpg = fs->lfs_segshift;	/* segment shift */
+#endif
+	}
+
+	/* Don't free random space on error. */
+	bp = NULL;
+	ump = NULL;
+
+	/* Read in the superblock. */
+	if (error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, NOCRED, &bp))
+		goto out;
+	fs = (struct lfs *)bp->b_data;
+
+	/* Check the basics. */
+	if (fs->lfs_magic != LFS_MAGIC || fs->lfs_bsize > MAXBSIZE ||
+	    fs->lfs_bsize < sizeof(struct lfs)) {
+		error = EINVAL;		/* XXX needs translation */
+		goto out;
+	}
+
+	/* Allocate the mount structure, copy the superblock into it. */
+	ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
+	fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
+	bcopy(bp->b_data, fs, sizeof(struct lfs));
+	if (sizeof(struct lfs) < LFS_SBPAD)			/* XXX why? */
+		bp->b_flags |= B_INVAL;
+	brelse(bp);
+	bp = NULL;
+
+	/* Set up the I/O information */
+	fs->lfs_iocount = 0;
+
+	/* Set up the ifile and lock aflags */
+	fs->lfs_doifile = 0;
+	fs->lfs_writer = 0;
+	fs->lfs_dirops = 0;
+	fs->lfs_seglock = 0;
+
+	/* Set the file system readonly/modify bits. */
+	fs->lfs_ronly = ronly;
+	if (ronly == 0)
+		fs->lfs_fmod = 1;
+
+	/* Initialize the mount structure. */
+	dev = devvp->v_rdev;
+	mp->mnt_data = (qaddr_t)ump;
+	mp->mnt_stat.f_fsid.val[0] = (long)dev;
+	mp->mnt_stat.f_fsid.val[1] = MOUNT_LFS;
+	mp->mnt_flag |= MNT_LOCAL;
+	ump->um_mountp = mp;
+	ump->um_dev = dev;
+	ump->um_devvp = devvp;
+	ump->um_bptrtodb = 0;
+	ump->um_seqinc = 1 << fs->lfs_fsbtodb;
+	ump->um_nindir = fs->lfs_nindir;
+	for (i = 0; i < MAXQUOTAS; i++)
+		ump->um_quotas[i] = NULLVP;
+	devvp->v_specflags |= SI_MOUNTEDON;
+
+	/*
+	 * We use the ifile vnode for almost every operation.  Instead of
+	 * retrieving it from the hash table each time we retrieve it here,
+	 * artificially increment the reference count and keep a pointer
+	 * to it in the incore copy of the superblock.
+	 */
+	if (error = VFS_VGET(mp, LFS_IFILE_INUM, &vp))
+		goto out;
+	fs->lfs_ivnode = vp;
+	VREF(vp);
+	vput(vp);
+
+	return (0);
+out:
+	if (bp)
+		brelse(bp);
+	(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
+	if (ump) {
+		free(ump->um_lfs, M_UFSMNT);
+		free(ump, M_UFSMNT);
+		mp->mnt_data = (qaddr_t)0;
+	}
+	return (error);
+}
+
+/*
+ * unmount system call
+ */
+lfs_unmount(mp, mntflags, p)
+	struct mount *mp;
+	int mntflags;
+	struct proc *p;
+{
+	extern int doforce;
+	register struct ufsmount *ump;
+	register struct lfs *fs;
+	int i, error, flags, ronly;
+
+	flags = 0;
+	if (mntflags & MNT_FORCE) {
+		if (!doforce || (mp->mnt_flag & MNT_ROOTFS))
+			return (EINVAL);
+		flags |= FORCECLOSE;
+	}
+
+	ump = VFSTOUFS(mp);
+	fs = ump->um_lfs;
+#ifdef QUOTA
+	if (mp->mnt_flag & MNT_QUOTA) {
+		if (error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags))
+			return (error);
+		for (i = 0; i < MAXQUOTAS; i++) {
+			if (ump->um_quotas[i] == NULLVP)
+				continue;
+			quotaoff(p, mp, i);
+		}
+		/*
+		 * Here we fall through to vflush again to ensure
+		 * that we have gotten rid of all the system vnodes.
+		 */
+	}
+#endif
+	if (error = vflush(mp, fs->lfs_ivnode, flags))
+		return (error);
+	fs->lfs_clean = 1;
+	if (error = VFS_SYNC(mp, 1, p->p_ucred, p))
+		return (error);
+	if (fs->lfs_ivnode->v_dirtyblkhd.lh_first)
+		panic("lfs_unmount: still dirty blocks on ifile vnode\n");
+	vrele(fs->lfs_ivnode);
+	vgone(fs->lfs_ivnode);
+
+	ronly = !fs->lfs_ronly;
+	ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
+	error = VOP_CLOSE(ump->um_devvp,
+	    ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
+	vrele(ump->um_devvp);
+	free(fs, M_UFSMNT);
+	free(ump, M_UFSMNT);
+	mp->mnt_data = (qaddr_t)0;
+	mp->mnt_flag &= ~MNT_LOCAL;
+	return (error);
+}
+
+/*
+ * Get file system statistics.
+ */
+lfs_statfs(mp, sbp, p)
+	struct mount *mp;
+	register struct statfs *sbp;
+	struct proc *p;
+{
+	register struct lfs *fs;
+	register struct ufsmount *ump;
+
+	ump = VFSTOUFS(mp);
+	fs = ump->um_lfs;
+	if (fs->lfs_magic != LFS_MAGIC)
+		panic("lfs_statfs: magic");
+	sbp->f_type = MOUNT_LFS;
+	sbp->f_bsize = fs->lfs_bsize;
+	sbp->f_iosize = fs->lfs_bsize;
+	sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize);
+	sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree);
+	sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) -
+		(fs->lfs_dsize - fs->lfs_bfree);
+	sbp->f_bavail = dbtofsb(fs, sbp->f_bavail);
+	sbp->f_files = fs->lfs_nfiles;
+	sbp->f_ffree = sbp->f_bfree * INOPB(fs);
+	if (sbp != &mp->mnt_stat) {
+		bcopy((caddr_t)mp->mnt_stat.f_mntonname,
+			(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
+		bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
+			(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
+	}
+	return (0);
+}
+
+/*
+ * Go through the disk queues to initiate sandbagged IO;
+ * go through the inodes to write those that have been modified;
+ * initiate the writing of the super block if it has been modified.
+ *
+ * Note: we are always called with the filesystem marked `MPBUSY'.
+ */
+lfs_sync(mp, waitfor, cred, p)
+	struct mount *mp;
+	int waitfor;
+	struct ucred *cred;
+	struct proc *p;
+{
+	int error;
+
+	/* All syncs must be checkpoints until roll-forward is implemented. */
+	error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
+#ifdef QUOTA
+	qsync(mp);
+#endif
+	return (error);
+}
+
+/*
+ * Look up an LFS dinode number to find its incore vnode.  If not already
+ * in core, read it in from the specified device.  Return the inode locked.
+ * Detection and handling of mount points must be done by the calling routine.
+ */
+int
+lfs_vget(mp, ino, vpp)
+	struct mount *mp;
+	ino_t ino;
+	struct vnode **vpp;
+{
+	register struct lfs *fs;
+	register struct inode *ip;
+	struct buf *bp;
+	struct ifile *ifp;
+	struct vnode *vp;
+	struct ufsmount *ump;
+	daddr_t daddr;
+	dev_t dev;
+	int error;
+
+	ump = VFSTOUFS(mp);
+	dev = ump->um_dev;
+	if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
+		return (0);
+
+	/* Translate the inode number to a disk address. */
+	fs = ump->um_lfs;
+	if (ino == LFS_IFILE_INUM)
+		daddr = fs->lfs_idaddr;
+	else {
+		LFS_IENTRY(ifp, fs, ino, bp);
+		daddr = ifp->if_daddr;
+		brelse(bp);
+		if (daddr == LFS_UNUSED_DADDR)
+			return (ENOENT);
+	}
+
+	/* Allocate new vnode/inode. */
+	if (error = lfs_vcreate(mp, ino, &vp)) {
+		*vpp = NULL;
+		return (error);
+	}
+
+	/*
+	 * Put it onto its hash chain and lock it so that other requests for
+	 * this inode will block if they arrive while we are sleeping waiting
+	 * for old data structures to be purged or for the contents of the
+	 * disk portion of this inode to be read.
+	 */
+	ip = VTOI(vp);
+	ufs_ihashins(ip);
+
+	/*
+	 * XXX
+	 * This may not need to be here, logically it should go down with
+	 * the i_devvp initialization.
+	 * Ask Kirk.
+	 */
+	ip->i_lfs = ump->um_lfs;
+
+	/* Read in the disk contents for the inode, copy into the inode. */
+	if (error =
+	    bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) {
+		/*
+		 * The inode does not contain anything useful, so it would
+		 * be misleading to leave it on its hash chain. With mode
+		 * still zero, it will be unlinked and returned to the free
+		 * list by vput().
+		 */
+		vput(vp);
+		brelse(bp);
+		*vpp = NULL;
+		return (error);
+	}
+	ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data);
+	brelse(bp);
+
+	/*
+	 * Initialize the vnode from the inode, check for aliases.  In all
+	 * cases re-init ip, the underlying vnode/inode may have changed.
+	 */
+	if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) {
+		vput(vp);
+		*vpp = NULL;
+		return (error);
+	}
+	/*
+	 * Finish inode initialization now that aliasing has been resolved.
+	 */
+	ip->i_devvp = ump->um_devvp;
+	VREF(ip->i_devvp);
+	*vpp = vp;
+	return (0);
+}
+
+/*
+ * File handle to vnode
+ *
+ * Have to be really careful about stale file handles:
+ * - check that the inode number is valid
+ * - call lfs_vget() to get the locked inode
+ * - check for an unallocated inode (i_mode == 0)
+ * - check that the given client host has export rights and return
+ *   those rights via. exflagsp and credanonp
+ *
+ * XXX
+ * use ifile to see if inode is allocated instead of reading off disk
+ * what is the relationship between my generational number and the NFS
+ * generational number.
+ */
+int
+lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
+	register struct mount *mp;
+	struct fid *fhp;
+	struct mbuf *nam;
+	struct vnode **vpp;
+	int *exflagsp;
+	struct ucred **credanonp;
+{
+	register struct ufid *ufhp;
+
+	ufhp = (struct ufid *)fhp;
+	if (ufhp->ufid_ino < ROOTINO)
+		return (ESTALE);
+	return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
+}
+
+/*
+ * Vnode pointer to File handle
+ */
+/* ARGSUSED */
+lfs_vptofh(vp, fhp)
+	struct vnode *vp;
+	struct fid *fhp;
+{
+	register struct inode *ip;
+	register struct ufid *ufhp;
+
+	ip = VTOI(vp);
+	ufhp = (struct ufid *)fhp;
+	ufhp->ufid_len = sizeof(struct ufid);
+	ufhp->ufid_ino = ip->i_number;
+	ufhp->ufid_gen = ip->i_gen;
+	return (0);
+}