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+/*-
+ * Copyright (c) 1991, 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.
+ *
+ * @(#)config.h 8.2 (Berkeley) 4/22/94
+ */
+
+/*
+ * The first boot and super blocks are given in absolute disk addresses.
+ * The byte-offset forms are preferred, as they don't imply a sector size.
+ */
+#define BBSIZE 8192
+#define SBSIZE 8192
+
+/*
+ * The following two constants set the default block and fragment sizes.
+ * Both constants must be a power of 2 and meet the following constraints:
+ * MINBSIZE <= DESBLKSIZE <= MAXBSIZE
+ * sectorsize <= DESFRAGSIZE <= DESBLKSIZE
+ * DESBLKSIZE / DESFRAGSIZE <= 8
+ */
+#define DFL_FRAGSIZE 1024
+#define DFL_BLKSIZE 8192
+
+/*
+ * Cylinder groups may have up to many cylinders. The actual
+ * number used depends upon how much information can be stored
+ * on a single cylinder. The default is to use 16 cylinders
+ * per group.
+ */
+#define DESCPG 16 /* desired fs_cpg */
+
+/*
+ * MINFREE gives the minimum acceptable percentage of file system
+ * blocks which may be free. If the freelist drops below this level
+ * only the superuser may continue to allocate blocks. This may
+ * be set to 0 if no reserve of free blocks is deemed necessary,
+ * however throughput drops by fifty percent if the file system
+ * is run at between 90% and 100% full; thus the default value of
+ * fs_minfree is 10%. With 10% free space, fragmentation is not a
+ * problem, so we choose to optimize for time.
+ */
+#define MINFREE 10
+#define DEFAULTOPT FS_OPTTIME
+
+/*
+ * Preference for optimization.
+ */
+#define FS_OPTTIME 0 /* minimize allocation time */
+#define FS_OPTSPACE 1 /* minimize disk fragmentation */
+
+
+/*
+ * ROTDELAY gives the minimum number of milliseconds to initiate
+ * another disk transfer on the same cylinder. It is used in
+ * determining the rotationally optimal layout for disk blocks
+ * within a file; the default of fs_rotdelay is 4ms.
+ */
+#define ROTDELAY 4
+
+/*
+ * MAXCONTIG sets the default for the maximum number of blocks
+ * that may be allocated sequentially. Since UNIX drivers are
+ * not capable of scheduling multi-block transfers, this defaults
+ * to 1 (ie no contiguous blocks are allocated).
+ */
+#define MAXCONTIG 1
+
+/*
+ * MAXBLKPG determines the maximum number of data blocks which are
+ * placed in a single cylinder group. The default is one indirect
+ * block worth of data blocks.
+ */
+#define MAXBLKPG(bsize) ((bsize) / sizeof(daddr_t))
+
+/*
+ * Each file system has a number of inodes statically allocated.
+ * We allocate one inode slot per NFPI fragments, expecting this
+ * to be far more than we will ever need.
+ */
+#define NFPI 4
+
+/*
+ * For each cylinder we keep track of the availability of blocks at different
+ * rotational positions, so that we can lay out the data to be picked
+ * up with minimum rotational latency. NRPOS is the default number of
+ * rotational positions that we distinguish. With NRPOS of 8 the resolution
+ * of our summary information is 2ms for a typical 3600 rpm drive.
+ */
+#define NRPOS 8 /* number distinct rotational positions */
+
+/*
+ * The following constants set the default block and segment size for a log
+ * structured file system. Both must be powers of two and the segment size
+ * must be a multiple of the block size. We also set minimum block and segment
+ * sizes.
+ */
+#define LFS_MINSEGSIZE (64*1024)
+#define DFL_LFSSEG (1024 * 1024)
+#define DFL_LFSSEG_SHIFT 20
+#define DFL_LFSSEG_MASK 0xFFFFF
+
+#define LFS_MINBLOCKSIZE 1024
+#define DFL_LFSBLOCK 4096
+#define DFL_LFSBLOCK_SHIFT 12
+#define DFL_LFSBLOCK_MASK 0xFFF
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