diff options
Diffstat (limited to 'sys/ufs/ffs/ffs_subr.c')
| -rw-r--r-- | sys/ufs/ffs/ffs_subr.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/sys/ufs/ffs/ffs_subr.c b/sys/ufs/ffs/ffs_subr.c new file mode 100644 index 00000000000..ab971d75712 --- /dev/null +++ b/sys/ufs/ffs/ffs_subr.c @@ -0,0 +1,240 @@ +/* $NetBSD: ffs_subr.c,v 1.4 1995/03/28 20:01:44 jtc Exp $ */ + +/* + * Copyright (c) 1982, 1986, 1989, 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. + * + * @(#)ffs_subr.c 8.2 (Berkeley) 9/21/93 + */ + +#include <sys/param.h> +#include <ufs/ffs/fs.h> + +#ifdef _KERNEL +#include <sys/systm.h> +#include <sys/vnode.h> +#include <ufs/ffs/ffs_extern.h> +#include <sys/buf.h> +#include <ufs/ufs/quota.h> +#include <ufs/ufs/inode.h> + +/* + * Return buffer with the contents of block "offset" from the beginning of + * directory "ip". If "res" is non-zero, fill it in with a pointer to the + * remaining space in the directory. + */ +int +ffs_blkatoff(ap) + struct vop_blkatoff_args /* { + struct vnode *a_vp; + off_t a_offset; + char **a_res; + struct buf **a_bpp; + } */ *ap; +{ + struct inode *ip; + register struct fs *fs; + struct buf *bp; + daddr_t lbn; + int bsize, error; + + ip = VTOI(ap->a_vp); + fs = ip->i_fs; + lbn = lblkno(fs, ap->a_offset); + bsize = blksize(fs, ip, lbn); + + *ap->a_bpp = NULL; + if (error = bread(ap->a_vp, lbn, bsize, NOCRED, &bp)) { + brelse(bp); + return (error); + } + if (ap->a_res) + *ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset); + *ap->a_bpp = bp; + return (0); +} +#endif + +/* + * Update the frsum fields to reflect addition or deletion + * of some frags. + */ +void +ffs_fragacct(fs, fragmap, fraglist, cnt) + struct fs *fs; + int fragmap; + int32_t fraglist[]; + int cnt; +{ + int inblk; + register int field, subfield; + register int siz, pos; + + inblk = (int)(fragtbl[fs->fs_frag][fragmap]) << 1; + fragmap <<= 1; + for (siz = 1; siz < fs->fs_frag; siz++) { + if ((inblk & (1 << (siz + (fs->fs_frag % NBBY)))) == 0) + continue; + field = around[siz]; + subfield = inside[siz]; + for (pos = siz; pos <= fs->fs_frag; pos++) { + if ((fragmap & field) == subfield) { + fraglist[siz] += cnt; + pos += siz; + field <<= siz; + subfield <<= siz; + } + field <<= 1; + subfield <<= 1; + } + } +} + +#if defined(_KERNEL) && defined(DIAGNOSTIC) +void +ffs_checkoverlap(bp, ip) + struct buf *bp; + struct inode *ip; +{ + register struct buf *ebp, *ep; + register daddr_t start, last; + struct vnode *vp; + + ebp = &buf[nbuf]; + start = bp->b_blkno; + last = start + btodb(bp->b_bcount) - 1; + for (ep = buf; ep < ebp; ep++) { + if (ep == bp || (ep->b_flags & B_INVAL) || + ep->b_vp == NULLVP) + continue; + if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0, NULL)) + continue; + if (vp != ip->i_devvp) + continue; + /* look for overlap */ + if (ep->b_bcount == 0 || ep->b_blkno > last || + ep->b_blkno + btodb(ep->b_bcount) <= start) + continue; + vprint("Disk overlap", vp); + (void)printf("\tstart %d, end %d overlap start %d, end %d\n", + start, last, ep->b_blkno, + ep->b_blkno + btodb(ep->b_bcount) - 1); + panic("Disk buffer overlap"); + } +} +#endif /* DIAGNOSTIC */ + +/* + * block operations + * + * check if a block is available + */ +int +ffs_isblock(fs, cp, h) + struct fs *fs; + unsigned char *cp; + daddr_t h; +{ + unsigned char mask; + + switch ((int)fs->fs_frag) { + case 8: + return (cp[h] == 0xff); + case 4: + mask = 0x0f << ((h & 0x1) << 2); + return ((cp[h >> 1] & mask) == mask); + case 2: + mask = 0x03 << ((h & 0x3) << 1); + return ((cp[h >> 2] & mask) == mask); + case 1: + mask = 0x01 << (h & 0x7); + return ((cp[h >> 3] & mask) == mask); + default: + panic("ffs_isblock"); + } +} + +/* + * take a block out of the map + */ +void +ffs_clrblock(fs, cp, h) + struct fs *fs; + u_char *cp; + daddr_t h; +{ + + switch ((int)fs->fs_frag) { + case 8: + cp[h] = 0; + return; + case 4: + cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2)); + return; + case 2: + cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1)); + return; + case 1: + cp[h >> 3] &= ~(0x01 << (h & 0x7)); + return; + default: + panic("ffs_clrblock"); + } +} + +/* + * put a block into the map + */ +void +ffs_setblock(fs, cp, h) + struct fs *fs; + unsigned char *cp; + daddr_t h; +{ + + switch ((int)fs->fs_frag) { + + case 8: + cp[h] = 0xff; + return; + case 4: + cp[h >> 1] |= (0x0f << ((h & 0x1) << 2)); + return; + case 2: + cp[h >> 2] |= (0x03 << ((h & 0x3) << 1)); + return; + case 1: + cp[h >> 3] |= (0x01 << (h & 0x7)); + return; + default: + panic("ffs_setblock"); + } +} |