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authorMichael I. Bushnell <mib@gnu.org>1994-02-10 18:38:52 +0000
committerMichael I. Bushnell <mib@gnu.org>1994-02-10 18:38:52 +0000
commita090495b15bdb34e9918190d3d0b6860a845f2cd (patch)
treec46dd3313b2d4fcf425621092a4b3b0e55eb0a35 /ufs
parent8f37efc92fb4d3ee85fc3945210a5418e076b1d0 (diff)
Initial revision
Diffstat (limited to 'ufs')
-rw-r--r--ufs/devio.c74
-rw-r--r--ufs/subr.c187
-rw-r--r--ufs/tables.c122
3 files changed, 383 insertions, 0 deletions
diff --git a/ufs/devio.c b/ufs/devio.c
new file mode 100644
index 00000000..957f2504
--- /dev/null
+++ b/ufs/devio.c
@@ -0,0 +1,74 @@
+/* Device input and output
+ Copyright (C) 1992, 1993, 1994 Free Software Foundation
+
+This file is part of the GNU Hurd.
+
+The GNU Hurd is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+The GNU Hurd is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU Hurd; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Written by Michael I. Bushnell. */
+
+#include "ufs.h"
+#include <device/device.h>
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+
+/* Write disk block ADDR with DATA of LEN bytes, waiting for completion. */
+error_t
+dev_write_sync (daddr_t addr,
+ vm_address_t data,
+ long len)
+{
+ int foo;
+ assert (!readonly);
+ if (device_write (ufs_device, 0, addr, (io_buf_ptr_t) data, len, &foo)
+ || foo != len)
+ return EIO;
+ return 0;
+}
+
+/* Write diskblock ADDR with DATA of LEN bytes; don't bother waiting
+ for completion. */
+error_t
+dev_write (daddr_t addr,
+ vm_address_t data,
+ long len)
+{
+ int foo;
+ assert (!readonly);
+ if (device_write_request (ufs_device, MACH_PORT_NULL, 0, addr,
+ (io_buf_ptr_t) data, len, &foo)
+ || foo != len)
+ return EIO;
+ return 0;
+}
+
+static int deverr;
+
+/* Read disk block ADDR; put the address of the data in DATA; read LEN
+ bytes. Always *DATA should be a full page no matter what. */
+error_t
+dev_read_sync (daddr_t addr,
+ vm_address_t *data,
+ long len)
+{
+ int foo;
+ deverr = device_read (ufs_device, 0, addr, len, (io_buf_ptr_t *)data,
+ (u_int *)&foo);
+ if (deverr || foo != len)
+ return EIO;
+ return 0;
+}
+
diff --git a/ufs/subr.c b/ufs/subr.c
new file mode 100644
index 00000000..b61b09d6
--- /dev/null
+++ b/ufs/subr.c
@@ -0,0 +1,187 @@
+/* Miscellaneous map manipulation routines
+ Copyright (C) 1991, 1992, 1994 Free Software Foundation
+
+This file is part of the GNU Hurd.
+
+The GNU Hurd is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+The GNU Hurd is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU Hurd; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Slightly modified from UCB by Michael I. Bushnell. */
+
+/*
+ * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution is only permitted until one year after the first shipment
+ * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
+ * binary forms are permitted provided that: (1) source distributions retain
+ * this entire copyright notice and comment, and (2) distributions including
+ * binaries display the following acknowledgement: This product includes
+ * software developed by the University of California, Berkeley and its
+ * contributors'' in the documentation or other materials provided with the
+ * distribution and in all advertising materials mentioning features or use
+ * of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * @(#)ufs_subr.c 7.13 (Berkeley) 6/28/90
+ */
+
+
+#include <assert.h>
+
+extern int around[9];
+extern int inside[9];
+extern u_char *fragtbl[];
+
+/*
+ * Update the frsum fields to reflect addition or deletion
+ * of some frags.
+ */
+void
+fragacct(int fragmap,
+ long fraglist[],
+ int cnt)
+{
+ int inblk;
+ int field, subfield;
+ int siz, pos;
+
+ inblk = (int)(fragtbl[sblock->fs_frag][fragmap]) << 1;
+ fragmap <<= 1;
+ for (siz = 1; siz < sblock->fs_frag; siz++) {
+ if ((inblk & (1 << (siz + (sblock->fs_frag % NBBY)))) == 0)
+ continue;
+ field = around[siz];
+ subfield = inside[siz];
+ for (pos = siz; pos <= sblock->fs_frag; pos++) {
+ if ((fragmap & field) == subfield) {
+ fraglist[siz] += cnt;
+ pos += siz;
+ field <<= siz;
+ subfield <<= siz;
+ }
+ field <<= 1;
+ subfield <<= 1;
+ }
+ }
+}
+
+/*
+ * block operations
+ *
+ * check if a block is available
+ */
+int
+isblock(u_char *cp,
+ daddr_t h)
+{
+ u_char mask;
+
+ switch ((int)sblock->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:
+ assert (0);
+ }
+}
+
+/*
+ * take a block out of the map
+ */
+void
+clrblock(u_char *cp,
+ daddr_t h)
+{
+
+ switch ((int)sblock->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:
+ assert (0);
+ }
+}
+
+/*
+ * put a block into the map
+ */
+void
+setblock(u_char *cp,
+ daddr_t h)
+{
+ switch ((int)sblock->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:
+ assert (0);
+ }
+}
+
+int
+skpc(u_char mask,
+ u_int size,
+ u_char *cp)
+{
+ u_char *end = &cp[size];
+
+ while (cp < end && *cp == mask)
+ cp++;
+ return (end - cp);
+}
+
+int
+scanc(u_int size,
+ u_char *cp,
+ u_char table[],
+ u_char mask)
+{
+ register u_char *end = &cp[size];
+
+ while (cp < end && (table[*cp] & mask) == 0)
+ cp++;
+ return (end - cp);
+}
diff --git a/ufs/tables.c b/ufs/tables.c
new file mode 100644
index 00000000..42badaed
--- /dev/null
+++ b/ufs/tables.c
@@ -0,0 +1,122 @@
+/* Tables for fast computation */
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution is only permitted until one year after the first shipment
+ * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
+ * binary forms are permitted provided that: (1) source distributions retain
+ * this entire copyright notice and comment, and (2) distributions including
+ * binaries display the following acknowledgement: This product includes
+ * software developed by the University of California, Berkeley and its
+ * contributors'' in the documentation or other materials provided with the
+ * distribution and in all advertising materials mentioning features or use
+ * of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * @(#)ufs_tables.c 7.4 (Berkeley) 6/28/90
+ */
+
+/*
+ * Bit patterns for identifying fragments in the block map
+ * used as ((map & around) == inside)
+ */
+int around[9] = {
+ 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
+};
+int inside[9] = {
+ 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
+};
+
+/*
+ * Given a block map bit pattern, the frag tables tell whether a
+ * particular size fragment is available.
+ *
+ * used as:
+ * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
+ * at least one fragment of the indicated size is available
+ * }
+ *
+ * These tables are used by the scanc instruction on the VAX to
+ * quickly find an appropriate fragment.
+ */
+u_char fragtbl124[256] = {
+ 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
+ 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
+ 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
+ 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
+ 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
+ 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
+ 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
+ 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
+ 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
+ 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
+ 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
+ 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
+};
+
+u_char fragtbl8[256] = {
+ 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
+ 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
+ 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
+ 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
+ 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
+ 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
+ 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
+ 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
+ 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
+ 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
+ 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
+ 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
+ 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
+ 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
+ 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
+ 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
+ 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
+ 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
+ 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
+};
+
+/*
+ * The actual fragtbl array.
+ */
+u_char *fragtbl[MAXFRAG + 1] = {
+ 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
+};