/* $NetBSD: ffs_subr.c,v 1.44.40.1 2008/06/05 19:14:37 mjf 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. 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 */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include __KERNEL_RCSID(0, "$NetBSD: ffs_subr.c,v 1.44.40.1 2008/06/05 19:14:37 mjf Exp $"); #include /* in ffs_tables.c */ extern const int inside[], around[]; extern const u_char * const fragtbl[]; #include #include #include #ifndef _KERNEL #include void panic(const char *, ...) __attribute__((__noreturn__,__format__(__printf__,1,2))); #else /* _KERNEL */ #include #include #include #include #include #include #include #include #include #include /* * Load up the contents of an inode and copy the appropriate pieces * to the incore copy. */ void ffs_load_inode(struct buf *bp, struct inode *ip, struct fs *fs, ino_t ino) { struct ufs1_dinode *dp1; struct ufs2_dinode *dp2; if (ip->i_ump->um_fstype == UFS1) { dp1 = (struct ufs1_dinode *)bp->b_data + ino_to_fsbo(fs, ino); #ifdef FFS_EI if (UFS_FSNEEDSWAP(fs)) ffs_dinode1_swap(dp1, ip->i_din.ffs1_din); else #endif *ip->i_din.ffs1_din = *dp1; ip->i_mode = ip->i_ffs1_mode; ip->i_nlink = ip->i_ffs1_nlink; ip->i_size = ip->i_ffs1_size; ip->i_flags = ip->i_ffs1_flags; ip->i_gen = ip->i_ffs1_gen; ip->i_uid = ip->i_ffs1_uid; ip->i_gid = ip->i_ffs1_gid; } else { dp2 = (struct ufs2_dinode *)bp->b_data + ino_to_fsbo(fs, ino); #ifdef FFS_EI if (UFS_FSNEEDSWAP(fs)) ffs_dinode2_swap(dp2, ip->i_din.ffs2_din); else #endif *ip->i_din.ffs2_din = *dp2; ip->i_mode = ip->i_ffs2_mode; ip->i_nlink = ip->i_ffs2_nlink; ip->i_size = ip->i_ffs2_size; ip->i_flags = ip->i_ffs2_flags; ip->i_gen = ip->i_ffs2_gen; ip->i_uid = ip->i_ffs2_uid; ip->i_gid = ip->i_ffs2_gid; } } int ffs_getblk(struct vnode *vp, daddr_t lblkno, daddr_t blkno, int size, bool clearbuf, buf_t **bpp) { int error = 0; KASSERT(blkno >= 0 || blkno == FFS_NOBLK); if ((*bpp = getblk(vp, lblkno, size, 0, 0)) == NULL) return ENOMEM; if (blkno != FFS_NOBLK) (*bpp)->b_blkno = blkno; if (clearbuf) clrbuf(*bpp); if ((*bpp)->b_blkno >= 0 && (error = fscow_run(*bpp, false)) != 0) brelse(*bpp, BC_INVAL); return error; } #endif /* _KERNEL */ /* * Update the frsum fields to reflect addition or deletion * of some frags. */ void ffs_fragacct(struct fs *fs, int fragmap, int32_t fraglist[], int cnt, int needswap) { 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 - 1))))) == 0) continue; field = around[siz]; subfield = inside[siz]; for (pos = siz; pos <= fs->fs_frag; pos++) { if ((fragmap & field) == subfield) { fraglist[siz] = ufs_rw32( ufs_rw32(fraglist[siz], needswap) + cnt, needswap); pos += siz; field <<= siz; subfield <<= siz; } field <<= 1; subfield <<= 1; } } } /* * block operations * * check if a block is available * returns true if all the correponding bits in the free map are 1 * returns false if any corresponding bit in the free map is 0 */ int ffs_isblock(struct fs *fs, u_char *cp, int32_t h) { u_char mask; switch ((int)fs->fs_fragshift) { case 3: return (cp[h] == 0xff); case 2: mask = 0x0f << ((h & 0x1) << 2); return ((cp[h >> 1] & mask) == mask); case 1: mask = 0x03 << ((h & 0x3) << 1); return ((cp[h >> 2] & mask) == mask); case 0: mask = 0x01 << (h & 0x7); return ((cp[h >> 3] & mask) == mask); default: panic("ffs_isblock: unknown fs_fragshift %d", (int)fs->fs_fragshift); } } /* * check if a block is completely allocated * returns true if all the corresponding bits in the free map are 0 * returns false if any corresponding bit in the free map is 1 */ int ffs_isfreeblock(struct fs *fs, u_char *cp, int32_t h) { switch ((int)fs->fs_fragshift) { case 3: return (cp[h] == 0); case 2: return ((cp[h >> 1] & (0x0f << ((h & 0x1) << 2))) == 0); case 1: return ((cp[h >> 2] & (0x03 << ((h & 0x3) << 1))) == 0); case 0: return ((cp[h >> 3] & (0x01 << (h & 0x7))) == 0); default: panic("ffs_isfreeblock: unknown fs_fragshift %d", (int)fs->fs_fragshift); } } /* * take a block out of the map */ void ffs_clrblock(struct fs *fs, u_char *cp, int32_t h) { switch ((int)fs->fs_fragshift) { case 3: cp[h] = 0; return; case 2: cp[h >> 1] &= ~(0x0f << ((h & 0x1) << 2)); return; case 1: cp[h >> 2] &= ~(0x03 << ((h & 0x3) << 1)); return; case 0: cp[h >> 3] &= ~(0x01 << (h & 0x7)); return; default: panic("ffs_clrblock: unknown fs_fragshift %d", (int)fs->fs_fragshift); } } /* * put a block into the map */ void ffs_setblock(struct fs *fs, u_char *cp, int32_t h) { switch ((int)fs->fs_fragshift) { case 3: cp[h] = 0xff; return; case 2: cp[h >> 1] |= (0x0f << ((h & 0x1) << 2)); return; case 1: cp[h >> 2] |= (0x03 << ((h & 0x3) << 1)); return; case 0: cp[h >> 3] |= (0x01 << (h & 0x7)); return; default: panic("ffs_setblock: unknown fs_fragshift %d", (int)fs->fs_fragshift); } }