| Current Path : /usr/src/sys/ufs/ffs/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sys/ufs/ffs/ffs_subr.c |
/*-
* 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.
* 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 8.5 (Berkeley) 3/21/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/ufs/ffs/ffs_subr.c 207141 2010-04-24 07:05:35Z jeff $");
#include <sys/param.h>
#ifndef _KERNEL
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#else
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/ucred.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/ffs/fs.h>
#ifdef KDB
void ffs_checkoverlap(struct buf *, struct inode *);
#endif
/*
* 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(vp, offset, res, bpp)
struct vnode *vp;
off_t offset;
char **res;
struct buf **bpp;
{
struct inode *ip;
struct fs *fs;
struct buf *bp;
ufs_lbn_t lbn;
int bsize, error;
ip = VTOI(vp);
fs = ip->i_fs;
lbn = lblkno(fs, offset);
bsize = blksize(fs, ip, lbn);
*bpp = NULL;
error = bread(vp, lbn, bsize, NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
if (res)
*res = (char *)bp->b_data + blkoff(fs, offset);
*bpp = bp;
return (0);
}
/*
* Load up the contents of an inode and copy the appropriate pieces
* to the incore copy.
*/
void
ffs_load_inode(bp, ip, fs, ino)
struct buf *bp;
struct inode *ip;
struct fs *fs;
ino_t ino;
{
if (ip->i_ump->um_fstype == UFS1) {
*ip->i_din1 =
*((struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
ip->i_mode = ip->i_din1->di_mode;
ip->i_nlink = ip->i_din1->di_nlink;
ip->i_size = ip->i_din1->di_size;
ip->i_flags = ip->i_din1->di_flags;
ip->i_gen = ip->i_din1->di_gen;
ip->i_uid = ip->i_din1->di_uid;
ip->i_gid = ip->i_din1->di_gid;
} else {
*ip->i_din2 =
*((struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino));
ip->i_mode = ip->i_din2->di_mode;
ip->i_nlink = ip->i_din2->di_nlink;
ip->i_size = ip->i_din2->di_size;
ip->i_flags = ip->i_din2->di_flags;
ip->i_gen = ip->i_din2->di_gen;
ip->i_uid = ip->i_din2->di_uid;
ip->i_gid = ip->i_din2->di_gid;
}
}
#endif /* KERNEL */
/*
* 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;
int field, subfield;
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;
}
}
}
#ifdef KDB
void
ffs_checkoverlap(bp, ip)
struct buf *bp;
struct inode *ip;
{
struct buf *ebp, *ep;
ufs2_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;
vp = ip->i_devvp;
/* 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);
printf("\tstart %jd, end %jd overlap start %jd, end %jd\n",
(intmax_t)start, (intmax_t)last, (intmax_t)ep->b_blkno,
(intmax_t)(ep->b_blkno + btodb(ep->b_bcount) - 1));
panic("ffs_checkoverlap: Disk buffer overlap");
}
}
#endif /* KDB */
/*
* block operations
*
* check if a block is available
*/
int
ffs_isblock(fs, cp, h)
struct fs *fs;
unsigned char *cp;
ufs1_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:
#ifdef _KERNEL
panic("ffs_isblock");
#endif
break;
}
return (0);
}
/*
* check if a block is free
*/
int
ffs_isfreeblock(fs, cp, h)
struct fs *fs;
u_char *cp;
ufs1_daddr_t h;
{
switch ((int)fs->fs_frag) {
case 8:
return (cp[h] == 0);
case 4:
return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0);
case 2:
return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0);
case 1:
return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0);
default:
#ifdef _KERNEL
panic("ffs_isfreeblock");
#endif
break;
}
return (0);
}
/*
* take a block out of the map
*/
void
ffs_clrblock(fs, cp, h)
struct fs *fs;
u_char *cp;
ufs1_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:
#ifdef _KERNEL
panic("ffs_clrblock");
#endif
break;
}
}
/*
* put a block into the map
*/
void
ffs_setblock(fs, cp, h)
struct fs *fs;
unsigned char *cp;
ufs1_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:
#ifdef _KERNEL
panic("ffs_setblock");
#endif
break;
}
}
/*
* Update the cluster map because of an allocation or free.
*
* Cnt == 1 means free; cnt == -1 means allocating.
*/
void
ffs_clusteracct(fs, cgp, blkno, cnt)
struct fs *fs;
struct cg *cgp;
ufs1_daddr_t blkno;
int cnt;
{
int32_t *sump;
int32_t *lp;
u_char *freemapp, *mapp;
int i, start, end, forw, back, map, bit;
if (fs->fs_contigsumsize <= 0)
return;
freemapp = cg_clustersfree(cgp);
sump = cg_clustersum(cgp);
/*
* Allocate or clear the actual block.
*/
if (cnt > 0)
setbit(freemapp, blkno);
else
clrbit(freemapp, blkno);
/*
* Find the size of the cluster going forward.
*/
start = blkno + 1;
end = start + fs->fs_contigsumsize;
if (end >= cgp->cg_nclusterblks)
end = cgp->cg_nclusterblks;
mapp = &freemapp[start / NBBY];
map = *mapp++;
bit = 1 << (start % NBBY);
for (i = start; i < end; i++) {
if ((map & bit) == 0)
break;
if ((i & (NBBY - 1)) != (NBBY - 1)) {
bit <<= 1;
} else {
map = *mapp++;
bit = 1;
}
}
forw = i - start;
/*
* Find the size of the cluster going backward.
*/
start = blkno - 1;
end = start - fs->fs_contigsumsize;
if (end < 0)
end = -1;
mapp = &freemapp[start / NBBY];
map = *mapp--;
bit = 1 << (start % NBBY);
for (i = start; i > end; i--) {
if ((map & bit) == 0)
break;
if ((i & (NBBY - 1)) != 0) {
bit >>= 1;
} else {
map = *mapp--;
bit = 1 << (NBBY - 1);
}
}
back = start - i;
/*
* Account for old cluster and the possibly new forward and
* back clusters.
*/
i = back + forw + 1;
if (i > fs->fs_contigsumsize)
i = fs->fs_contigsumsize;
sump[i] += cnt;
if (back > 0)
sump[back] -= cnt;
if (forw > 0)
sump[forw] -= cnt;
/*
* Update cluster summary information.
*/
lp = &sump[fs->fs_contigsumsize];
for (i = fs->fs_contigsumsize; i > 0; i--)
if (*lp-- > 0)
break;
fs->fs_maxcluster[cgp->cg_cgx] = i;
}