51369649b0
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
354 lines
7.9 KiB
C
354 lines
7.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_subr.c 8.5 (Berkeley) 3/21/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#ifndef _KERNEL
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#else
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/ucred.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <ufs/ffs/fs.h>
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/*
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* Return buffer with the contents of block "offset" from the beginning of
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* directory "ip". If "res" is non-zero, fill it in with a pointer to the
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* remaining space in the directory.
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*/
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int
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ffs_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
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{
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struct inode *ip;
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struct fs *fs;
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struct buf *bp;
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ufs_lbn_t lbn;
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int bsize, error;
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ip = VTOI(vp);
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fs = ITOFS(ip);
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lbn = lblkno(fs, offset);
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bsize = blksize(fs, ip, lbn);
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*bpp = NULL;
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error = bread(vp, lbn, bsize, NOCRED, &bp);
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if (error) {
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brelse(bp);
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return (error);
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}
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if (res)
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*res = (char *)bp->b_data + blkoff(fs, offset);
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*bpp = bp;
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return (0);
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}
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/*
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* Load up the contents of an inode and copy the appropriate pieces
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* to the incore copy.
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*/
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void
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ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino)
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{
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if (I_IS_UFS1(ip)) {
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*ip->i_din1 =
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*((struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
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ip->i_mode = ip->i_din1->di_mode;
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ip->i_nlink = ip->i_din1->di_nlink;
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ip->i_size = ip->i_din1->di_size;
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ip->i_flags = ip->i_din1->di_flags;
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ip->i_gen = ip->i_din1->di_gen;
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ip->i_uid = ip->i_din1->di_uid;
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ip->i_gid = ip->i_din1->di_gid;
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} else {
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*ip->i_din2 =
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*((struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
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ip->i_mode = ip->i_din2->di_mode;
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ip->i_nlink = ip->i_din2->di_nlink;
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ip->i_size = ip->i_din2->di_size;
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ip->i_flags = ip->i_din2->di_flags;
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ip->i_gen = ip->i_din2->di_gen;
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ip->i_uid = ip->i_din2->di_uid;
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ip->i_gid = ip->i_din2->di_gid;
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}
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}
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#endif /* KERNEL */
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/*
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* Update the frsum fields to reflect addition or deletion
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* of some frags.
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*/
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void
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ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt)
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{
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int inblk;
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int field, subfield;
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int siz, pos;
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inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1;
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fragmap <<= 1;
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for (siz = 1; siz < fs->fs_frag; siz++) {
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if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0)
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continue;
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field = around[siz];
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subfield = inside[siz];
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for (pos = siz; pos <= fs->fs_frag; pos++) {
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if ((fragmap & field) == subfield) {
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fraglist[siz] += cnt;
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pos += siz;
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field <<= siz;
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subfield <<= siz;
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}
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field <<= 1;
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subfield <<= 1;
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}
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}
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}
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/*
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* block operations
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*
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* check if a block is available
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*/
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int
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ffs_isblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
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{
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unsigned char mask;
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switch ((int)fs->fs_frag) {
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case 8:
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return (cp[h] == 0xff);
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case 4:
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mask = 0x0f << ((h & 0x1) << 2);
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return ((cp[h >> 1] & mask) == mask);
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case 2:
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mask = 0x03 << ((h & 0x3) << 1);
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return ((cp[h >> 2] & mask) == mask);
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case 1:
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mask = 0x01 << (h & 0x7);
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return ((cp[h >> 3] & mask) == mask);
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default:
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#ifdef _KERNEL
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panic("ffs_isblock");
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#endif
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break;
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}
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return (0);
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}
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/*
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* check if a block is free
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*/
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int
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ffs_isfreeblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
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{
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switch ((int)fs->fs_frag) {
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case 8:
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return (cp[h] == 0);
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case 4:
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return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
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case 2:
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return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
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case 1:
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return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
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default:
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#ifdef _KERNEL
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panic("ffs_isfreeblock");
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#endif
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break;
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}
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return (0);
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}
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/*
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* take a block out of the map
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*/
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void
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ffs_clrblock(struct fs *fs, u_char *cp, ufs1_daddr_t h)
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{
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switch ((int)fs->fs_frag) {
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case 8:
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cp[h] = 0;
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return;
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case 4:
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cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2));
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return;
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case 2:
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cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1));
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return;
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case 1:
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cp[h >> 3] &= ~(0x01 << (h & 0x7));
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return;
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default:
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#ifdef _KERNEL
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panic("ffs_clrblock");
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#endif
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break;
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}
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}
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/*
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* put a block into the map
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*/
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void
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ffs_setblock(struct fs *fs, unsigned char *cp, ufs1_daddr_t h)
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{
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switch ((int)fs->fs_frag) {
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case 8:
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cp[h] = 0xff;
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return;
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case 4:
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cp[h >> 1] |= (0x0f << ((h & 0x1) << 2));
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return;
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case 2:
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cp[h >> 2] |= (0x03 << ((h & 0x3) << 1));
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return;
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case 1:
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cp[h >> 3] |= (0x01 << (h & 0x7));
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return;
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default:
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#ifdef _KERNEL
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panic("ffs_setblock");
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#endif
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break;
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}
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}
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/*
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* Update the cluster map because of an allocation or free.
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*
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* Cnt == 1 means free; cnt == -1 means allocating.
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*/
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void
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ffs_clusteracct(struct fs *fs, struct cg *cgp, ufs1_daddr_t blkno, int cnt)
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{
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int32_t *sump;
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int32_t *lp;
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u_char *freemapp, *mapp;
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int i, start, end, forw, back, map, bit;
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if (fs->fs_contigsumsize <= 0)
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return;
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freemapp = cg_clustersfree(cgp);
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sump = cg_clustersum(cgp);
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/*
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* Allocate or clear the actual block.
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*/
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if (cnt > 0)
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setbit(freemapp, blkno);
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else
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clrbit(freemapp, blkno);
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/*
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* Find the size of the cluster going forward.
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*/
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start = blkno + 1;
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end = start + fs->fs_contigsumsize;
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if (end >= cgp->cg_nclusterblks)
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end = cgp->cg_nclusterblks;
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mapp = &freemapp[start / NBBY];
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map = *mapp++;
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bit = 1 << (start % NBBY);
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for (i = start; i < end; i++) {
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if ((map & bit) == 0)
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break;
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if ((i & (NBBY - 1)) != (NBBY - 1)) {
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bit <<= 1;
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} else {
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map = *mapp++;
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bit = 1;
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}
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}
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forw = i - start;
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/*
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* Find the size of the cluster going backward.
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*/
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start = blkno - 1;
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end = start - fs->fs_contigsumsize;
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if (end < 0)
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end = -1;
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mapp = &freemapp[start / NBBY];
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map = *mapp--;
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bit = 1 << (start % NBBY);
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for (i = start; i > end; i--) {
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if ((map & bit) == 0)
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break;
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if ((i & (NBBY - 1)) != 0) {
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bit >>= 1;
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} else {
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map = *mapp--;
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bit = 1 << (NBBY - 1);
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}
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}
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back = start - i;
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/*
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* Account for old cluster and the possibly new forward and
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* back clusters.
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*/
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i = back + forw + 1;
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if (i > fs->fs_contigsumsize)
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i = fs->fs_contigsumsize;
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sump[i] += cnt;
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if (back > 0)
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sump[back] -= cnt;
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if (forw > 0)
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sump[forw] -= cnt;
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/*
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* Update cluster summary information.
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*/
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lp = &sump[fs->fs_contigsumsize];
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for (i = fs->fs_contigsumsize; i > 0; i--)
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if (*lp-- > 0)
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break;
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fs->fs_maxcluster[cgp->cg_cgx] = i;
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}
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