BSD 4.4 Lite Kernel Sources

1 files changed, 251 insertions, 0 deletions

diff --git a/sys/ufs/lfs/lfs_alloc.c b/sys/ufs/lfs/lfs_alloc.c
new file mode 100644
index 0000000..3f06c81
--- /dev/null
+++ b/sys/ufs/lfs/lfs_alloc.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright (c) 1991, 1993
+ *	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_alloc.c	8.4 (Berkeley) 1/4/94
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/buf.h>
+#include <sys/vnode.h>
+#include <sys/syslog.h>
+#include <sys/mount.h>
+#include <sys/malloc.h>
+
+#include <vm/vm.h>
+
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+#include <ufs/ufs/ufsmount.h>
+
+#include <ufs/lfs/lfs.h>
+#include <ufs/lfs/lfs_extern.h>
+
+extern u_long nextgennumber;
+
+/* Allocate a new inode. */
+/* ARGSUSED */
+int
+lfs_valloc(ap)
+	struct vop_valloc_args /* {
+		struct vnode *a_pvp;
+		int a_mode;
+		struct ucred *a_cred;
+		struct vnode **a_vpp;
+	} */ *ap;
+{
+	struct lfs *fs;
+	struct buf *bp;
+	struct ifile *ifp;
+	struct inode *ip;
+	struct vnode *vp;
+	daddr_t blkno;
+	ino_t new_ino;
+	u_long i, max;
+	int error;
+
+	/* Get the head of the freelist. */
+	fs = VTOI(ap->a_pvp)->i_lfs;
+	new_ino = fs->lfs_free;
+#ifdef ALLOCPRINT
+	printf("lfs_ialloc: allocate inode %d\n", new_ino);
+#endif
+
+	/*
+	 * Remove the inode from the free list and write the new start
+	 * of the free list into the superblock.
+	 */
+	LFS_IENTRY(ifp, fs, new_ino, bp);
+	if (ifp->if_daddr != LFS_UNUSED_DADDR)
+		panic("lfs_ialloc: inuse inode on the free list");
+	fs->lfs_free = ifp->if_nextfree;
+	brelse(bp);
+
+	/* Extend IFILE so that the next lfs_valloc will succeed. */
+	if (fs->lfs_free == LFS_UNUSED_INUM) {
+		vp = fs->lfs_ivnode;
+		ip = VTOI(vp);
+		blkno = lblkno(fs, ip->i_size);
+		lfs_balloc(vp, fs->lfs_bsize, blkno, &bp);
+		ip->i_size += fs->lfs_bsize;
+		vnode_pager_setsize(vp, (u_long)ip->i_size);
+		vnode_pager_uncache(vp);
+
+		i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) *
+		    fs->lfs_ifpb;
+		fs->lfs_free = i;
+		max = i + fs->lfs_ifpb;
+		for (ifp = (struct ifile *)bp->b_data; i < max; ++ifp) {
+			ifp->if_version = 1;
+			ifp->if_daddr = LFS_UNUSED_DADDR;
+			ifp->if_nextfree = ++i;
+		}
+		ifp--;
+		ifp->if_nextfree = LFS_UNUSED_INUM;
+		if (error = VOP_BWRITE(bp))
+			return (error);
+	}
+
+	/* Create a vnode to associate with the inode. */
+	if (error = lfs_vcreate(ap->a_pvp->v_mount, new_ino, &vp))
+		return (error);
+
+
+	ip = VTOI(vp);
+	/* Zero out the direct and indirect block addresses. */
+	bzero(&ip->i_din, sizeof(struct dinode));
+	ip->i_din.di_inumber = new_ino;
+
+	/* Set a new generation number for this inode. */
+	if (++nextgennumber < (u_long)time.tv_sec)
+		nextgennumber = time.tv_sec;
+	ip->i_gen = nextgennumber;
+
+	/* Insert into the inode hash table. */
+	ufs_ihashins(ip);
+
+	if (error = ufs_vinit(vp->v_mount, lfs_specop_p, LFS_FIFOOPS, &vp)) {
+		vput(vp);
+		*ap->a_vpp = NULL;
+		return (error);
+	}
+
+	*ap->a_vpp = vp;
+	vp->v_flag |= VDIROP;
+	VREF(ip->i_devvp);
+
+	/* Set superblock modified bit and increment file count. */
+	fs->lfs_fmod = 1;
+	++fs->lfs_nfiles;
+	return (0);
+}
+
+/* Create a new vnode/inode pair and initialize what fields we can. */
+int
+lfs_vcreate(mp, ino, vpp)
+	struct mount *mp;
+	ino_t ino;
+	struct vnode **vpp;
+{
+	extern int (**lfs_vnodeop_p)();
+	struct inode *ip;
+	struct ufsmount *ump;
+	int error, i;
+
+	/* Create the vnode. */
+	if (error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, vpp)) {
+		*vpp = NULL;
+		return (error);
+	}
+
+	/* Get a pointer to the private mount structure. */
+	ump = VFSTOUFS(mp);
+
+	/* Initialize the inode. */
+	MALLOC(ip, struct inode *, sizeof(struct inode), M_LFSNODE, M_WAITOK);
+	(*vpp)->v_data = ip;
+	ip->i_vnode = *vpp;
+	ip->i_devvp = ump->um_devvp;
+	ip->i_flag = IN_MODIFIED;
+	ip->i_dev = ump->um_dev;
+	ip->i_number = ip->i_din.di_inumber = ino;
+ip->i_din.di_spare[0] = 0xdeadbeef;
+ip->i_din.di_spare[1] = 0xdeadbeef;
+	ip->i_lfs = ump->um_lfs;
+#ifdef QUOTA
+	for (i = 0; i < MAXQUOTAS; i++)
+		ip->i_dquot[i] = NODQUOT;
+#endif
+	ip->i_lockf = 0;
+	ip->i_diroff = 0;
+	ip->i_mode = 0;
+	ip->i_size = 0;
+	ip->i_blocks = 0;
+	++ump->um_lfs->lfs_uinodes;
+	return (0);
+}
+
+/* Free an inode. */
+/* ARGUSED */
+int
+lfs_vfree(ap)
+	struct vop_vfree_args /* {
+		struct vnode *a_pvp;
+		ino_t a_ino;
+		int a_mode;
+	} */ *ap;
+{
+	SEGUSE *sup;
+	struct buf *bp;
+	struct ifile *ifp;
+	struct inode *ip;
+	struct lfs *fs;
+	daddr_t old_iaddr;
+	ino_t ino;
+
+	/* Get the inode number and file system. */
+	ip = VTOI(ap->a_pvp);
+	fs = ip->i_lfs;
+	ino = ip->i_number;
+	if (ip->i_flag & IN_MODIFIED) {
+		--fs->lfs_uinodes;
+		ip->i_flag &=
+		    ~(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE);
+	}
+	/*
+	 * Set the ifile's inode entry to unused, increment its version number
+	 * and link it into the free chain.
+	 */
+	LFS_IENTRY(ifp, fs, ino, bp);
+	old_iaddr = ifp->if_daddr;
+	ifp->if_daddr = LFS_UNUSED_DADDR;
+	++ifp->if_version;
+	ifp->if_nextfree = fs->lfs_free;
+	fs->lfs_free = ino;
+	(void) VOP_BWRITE(bp);
+
+	if (old_iaddr != LFS_UNUSED_DADDR) {
+		LFS_SEGENTRY(sup, fs, datosn(fs, old_iaddr), bp);
+#ifdef DIAGNOSTIC
+		if (sup->su_nbytes < sizeof(struct dinode))
+			panic("lfs_vfree: negative byte count (segment %d)\n",
+			    datosn(fs, old_iaddr));
+#endif
+		sup->su_nbytes -= sizeof(struct dinode);
+		(void) VOP_BWRITE(bp);
+	}
+
+	/* Set superblock modified bit and decrement file count. */
+	fs->lfs_fmod = 1;
+	--fs->lfs_nfiles;
+	return (0);
+}