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that are committed to being freed and reflect these blocks in the counts returned by statfs (and thus also by the `df' command). This change allows programs such as those that do news expiration to know when to stop if they are trying to create a certain percentage of free space. Note that this change does not solve the much harder problem of making this to-be-freed space available to applications that want it (thus on a nearly full filesystem, you may still encounter out-of-space conditions even though the free space will show up eventually). Hopefully this harder problem will be the subject of a future enhancement.
598 lines
25 KiB
C
598 lines
25 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)fs.h 8.13 (Berkeley) 3/21/95
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* $FreeBSD$
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*/
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#ifndef _UFS_FFS_FS_H_
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#define _UFS_FFS_FS_H_
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/*
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* Each disk drive contains some number of file systems.
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* A file system consists of a number of cylinder groups.
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* Each cylinder group has inodes and data.
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*
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* A file system is described by its super-block, which in turn
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* describes the cylinder groups. The super-block is critical
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* data and is replicated in each cylinder group to protect against
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* catastrophic loss. This is done at `newfs' time and the critical
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* super-block data does not change, so the copies need not be
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* referenced further unless disaster strikes.
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*
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* For file system fs, the offsets of the various blocks of interest
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* are given in the super block as:
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* [fs->fs_sblkno] Super-block
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* [fs->fs_cblkno] Cylinder group block
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* [fs->fs_iblkno] Inode blocks
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* [fs->fs_dblkno] Data blocks
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* The beginning of cylinder group cg in fs, is given by
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* the ``cgbase(fs, cg)'' macro.
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*
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* The first boot and super blocks are given in absolute disk addresses.
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* The byte-offset forms are preferred, as they don't imply a sector size.
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*/
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#define BBSIZE 8192
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#define SBSIZE 8192
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#define BBOFF ((off_t)(0))
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#define SBOFF ((off_t)(BBOFF + BBSIZE))
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#define BBLOCK ((ufs_daddr_t)(0))
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#define SBLOCK ((ufs_daddr_t)(BBLOCK + BBSIZE / DEV_BSIZE))
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/*
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* Addresses stored in inodes are capable of addressing fragments
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* of `blocks'. File system blocks of at most size MAXBSIZE can
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* be optionally broken into 2, 4, or 8 pieces, each of which is
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* addressable; these pieces may be DEV_BSIZE, or some multiple of
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* a DEV_BSIZE unit.
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*
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* Large files consist of exclusively large data blocks. To avoid
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* undue wasted disk space, the last data block of a small file may be
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* allocated as only as many fragments of a large block as are
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* necessary. The file system format retains only a single pointer
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* to such a fragment, which is a piece of a single large block that
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* has been divided. The size of such a fragment is determinable from
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* information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
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*
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* The file system records space availability at the fragment level;
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* to determine block availability, aligned fragments are examined.
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*/
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/*
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* MINBSIZE is the smallest allowable block size.
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* In order to insure that it is possible to create files of size
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* 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
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* MINBSIZE must be big enough to hold a cylinder group block,
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* thus changes to (struct cg) must keep its size within MINBSIZE.
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* Note that super blocks are always of size SBSIZE,
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* and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
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*/
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#define MINBSIZE 4096
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/*
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* The path name on which the file system is mounted is maintained
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* in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
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* the super block for this name.
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*/
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#define MAXMNTLEN 512
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/*
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* There is a 128-byte region in the superblock reserved for in-core
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* pointers to summary information. Originally this included an array
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* of pointers to blocks of struct csum; now there are just three
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* pointers and the remaining space is padded with fs_ocsp[].
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*
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* NOCSPTRS determines the size of this padding. One pointer (fs_csp)
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* is taken away to point to a contiguous array of struct csum for
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* all cylinder groups; a second (fs_maxcluster) points to an array
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* of cluster sizes that is computed as cylinder groups are inspected,
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* and the third points to an array that tracks the creation of new
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* directories.
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*/
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#define NOCSPTRS ((128 / sizeof(void *)) - 3)
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/*
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* A summary of contiguous blocks of various sizes is maintained
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* in each cylinder group. Normally this is set by the initial
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* value of fs_maxcontig. To conserve space, a maximum summary size
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* is set by FS_MAXCONTIG.
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*/
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#define FS_MAXCONTIG 16
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/*
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* MINFREE gives the minimum acceptable percentage of file system
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* blocks which may be free. If the freelist drops below this level
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* only the superuser may continue to allocate blocks. This may
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* be set to 0 if no reserve of free blocks is deemed necessary,
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* however throughput drops by fifty percent if the file system
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* is run at between 95% and 100% full; thus the minimum default
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* value of fs_minfree is 5%. However, to get good clustering
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* performance, 10% is a better choice. hence we use 10% as our
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* default value. With 10% free space, fragmentation is not a
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* problem, so we choose to optimize for time.
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*/
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#define MINFREE 8
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#define DEFAULTOPT FS_OPTTIME
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/*
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* Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
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* tune the layout preferences for directories within a filesystem.
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* His algorithm can be tuned by adjusting the following parameters
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* which tell the system the average file size and the average number
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* of files per directory. These defaults are well selected for typical
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* filesystems, but may need to be tuned for odd cases like filesystems
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* being used for sqiud caches or news spools.
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*/
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#define AVFILESIZ 16384 /* expected average file size */
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#define AFPDIR 64 /* expected number of files per directory */
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/*
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* The maximum number of snapshot nodes that can be associated
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* with each filesystem. This limit affects only the number of
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* snapshot files that can be recorded within the superblock so
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* that they can be found when the filesystem is mounted. However,
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* maintaining too many will slow the filesystem performance, so
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* having this limit is a good idea.
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*/
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#define FSMAXSNAP 20
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/*
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* Used to identify special blocks in snapshots:
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*
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* BLK_NOCOPY - A block that was unallocated at the time the snapshot
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* was taken, hence does not need to be copied when written.
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* BLK_SNAP - A block held by another snapshot that is not needed by this
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* snapshot. When the other snapshot is freed, the BLK_SNAP entries
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* are converted to BLK_NOCOPY. These are needed to allow fsck to
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* identify blocks that are in use by other snapshots (which are
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* expunged from this snapshot).
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*/
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#define BLK_NOCOPY ((ufs_daddr_t)(1))
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#define BLK_SNAP ((ufs_daddr_t)(2))
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/*
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* Sysctl values for the fast filesystem.
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*/
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#define FFS_ADJ_REFCNT 1 /* adjust inode reference count */
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#define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */
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#define FFS_BLK_FREE 3 /* free range of blocks in map */
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#define FFS_DIR_FREE 4 /* free specified dir inodes in map */
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#define FFS_FILE_FREE 5 /* free specified file inodes in map */
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#define FFS_SET_FLAGS 6 /* set filesystem flags */
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#define FFS_MAXID 7 /* number of valid ffs ids */
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/*
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* Command structure passed in to the filesystem to adjust filesystem values.
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*/
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#define FFS_CMD_VERSION 0x05181979 /* version ID */
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struct fsck_cmd {
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int version; /* version of command structure */
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int handle; /* reference to filesystem to be changed */
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off_t value; /* inode or block number to be affected */
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long size; /* amount or range to be adjusted */
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};
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/*
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* Per cylinder group information; summarized in blocks allocated
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* from first cylinder group data blocks. These blocks have to be
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* read in from fs_csaddr (size fs_cssize) in addition to the
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* super block.
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*/
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struct csum {
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int32_t cs_ndir; /* number of directories */
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int32_t cs_nbfree; /* number of free blocks */
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int32_t cs_nifree; /* number of free inodes */
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int32_t cs_nffree; /* number of free frags */
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};
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/*
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* Super block for an FFS file system.
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*/
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struct fs {
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int32_t fs_firstfield; /* historic file system linked list, */
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int32_t fs_unused_1; /* used for incore super blocks */
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ufs_daddr_t fs_sblkno; /* addr of super-block in filesys */
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ufs_daddr_t fs_cblkno; /* offset of cyl-block in filesys */
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ufs_daddr_t fs_iblkno; /* offset of inode-blocks in filesys */
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ufs_daddr_t fs_dblkno; /* offset of first data after cg */
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int32_t fs_cgoffset; /* cylinder group offset in cylinder */
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int32_t fs_cgmask; /* used to calc mod fs_ntrak */
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time_t fs_time; /* last time written */
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int32_t fs_size; /* number of blocks in fs */
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int32_t fs_dsize; /* number of data blocks in fs */
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int32_t fs_ncg; /* number of cylinder groups */
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int32_t fs_bsize; /* size of basic blocks in fs */
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int32_t fs_fsize; /* size of frag blocks in fs */
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int32_t fs_frag; /* number of frags in a block in fs */
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/* these are configuration parameters */
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int32_t fs_minfree; /* minimum percentage of free blocks */
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int32_t fs_rotdelay; /* num of ms for optimal next block */
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int32_t fs_rps; /* disk revolutions per second */
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/* these fields can be computed from the others */
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int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
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int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
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int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
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int32_t fs_fshift; /* ``numfrags'' calc number of frags */
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/* these are configuration parameters */
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int32_t fs_maxcontig; /* max number of contiguous blks */
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int32_t fs_maxbpg; /* max number of blks per cyl group */
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/* these fields can be computed from the others */
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int32_t fs_fragshift; /* block to frag shift */
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int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
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int32_t fs_sbsize; /* actual size of super block */
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int32_t fs_csmask; /* csum block offset (now unused) */
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int32_t fs_csshift; /* csum block number (now unused) */
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int32_t fs_nindir; /* value of NINDIR */
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int32_t fs_inopb; /* value of INOPB */
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int32_t fs_nspf; /* value of NSPF */
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/* yet another configuration parameter */
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int32_t fs_optim; /* optimization preference, see below */
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/* these fields are derived from the hardware */
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int32_t fs_npsect; /* # sectors/track including spares */
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int32_t fs_interleave; /* hardware sector interleave */
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int32_t fs_trackskew; /* sector 0 skew, per track */
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/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
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int32_t fs_id[2]; /* unique filesystem id */
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/* sizes determined by number of cylinder groups and their sizes */
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ufs_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */
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int32_t fs_cssize; /* size of cyl grp summary area */
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int32_t fs_cgsize; /* cylinder group size */
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/* these fields are derived from the hardware */
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int32_t fs_ntrak; /* tracks per cylinder */
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int32_t fs_nsect; /* sectors per track */
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int32_t fs_spc; /* sectors per cylinder */
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/* this comes from the disk driver partitioning */
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int32_t fs_ncyl; /* cylinders in file system */
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/* these fields can be computed from the others */
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int32_t fs_cpg; /* cylinders per group */
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int32_t fs_ipg; /* inodes per group */
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int32_t fs_fpg; /* blocks per group * fs_frag */
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/* this data must be re-computed after crashes */
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struct csum fs_cstotal; /* cylinder summary information */
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/* these fields are cleared at mount time */
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int8_t fs_fmod; /* super block modified flag */
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int8_t fs_clean; /* file system is clean flag */
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int8_t fs_ronly; /* mounted read-only flag */
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int8_t fs_flags; /* see FS_ flags below */
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u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
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/* these fields retain the current block allocation info */
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int32_t fs_cgrotor; /* last cg searched */
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void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
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u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
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struct csum *fs_csp; /* cg summary info buffer for fs_cs */
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int32_t *fs_maxcluster; /* max cluster in each cyl group */
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int32_t fs_cpc; /* cyl per cycle in postbl */
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int16_t fs_opostbl[16][8]; /* old rotation block list head */
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int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
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int32_t fs_avgfilesize; /* expected average file size */
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int32_t fs_avgfpdir; /* expected # of files per directory */
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int32_t fs_sparecon[26]; /* reserved for future constants */
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int32_t fs_pendingblocks; /* blocks in process of being freed */
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int32_t fs_pendinginodes; /* inodes in process of being freed */
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int32_t fs_contigsumsize; /* size of cluster summary array */
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int32_t fs_maxsymlinklen; /* max length of an internal symlink */
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int32_t fs_inodefmt; /* format of on-disk inodes */
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u_int64_t fs_maxfilesize; /* maximum representable file size */
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int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
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int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
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int32_t fs_state; /* validate fs_clean field */
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int32_t fs_postblformat; /* format of positional layout tables */
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int32_t fs_nrpos; /* number of rotational positions */
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int32_t fs_postbloff; /* (u_int16) rotation block list head */
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int32_t fs_rotbloff; /* (u_int8) blocks for each rotation */
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int32_t fs_magic; /* magic number */
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u_int8_t fs_space[1]; /* list of blocks for each rotation */
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/* actually longer */
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};
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/*
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* Filesystem identification
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*/
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#define FS_MAGIC 0x011954 /* the fast filesystem magic number */
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#define FS_OKAY 0x7c269d38 /* superblock checksum */
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#define FS_42INODEFMT -1 /* 4.2BSD inode format */
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#define FS_44INODEFMT 2 /* 4.4BSD inode format */
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/*
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* Preference for optimization.
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*/
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#define FS_OPTTIME 0 /* minimize allocation time */
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#define FS_OPTSPACE 1 /* minimize disk fragmentation */
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/*
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* Filesystem flags.
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*
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* Note that the FS_NEEDSFSCK flag is set and cleared only by the
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* fsck utility. It is set when background fsck finds an unexpected
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* inconsistency which requires a traditional foreground fsck to be
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* run. Such inconsistencies should only be found after an uncorrectable
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* disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when
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* it has successfully cleaned up the filesystem. The kernel uses this
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* flag to enforce that inconsistent filesystems be mounted read-only.
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*/
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#define FS_UNCLEAN 0x01 /* filesystem not clean at mount */
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#define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */
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#define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */
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/*
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* Rotational layout table format types
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*/
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#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
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#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
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/*
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* Macros for access to superblock array structures
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*/
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#define fs_postbl(fs, cylno) \
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(((fs)->fs_postblformat == FS_42POSTBLFMT) \
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? ((fs)->fs_opostbl[cylno]) \
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: ((int16_t *)((u_int8_t *)(fs) + \
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(fs)->fs_postbloff) + (cylno) * (fs)->fs_nrpos))
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#define fs_rotbl(fs) \
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(((fs)->fs_postblformat == FS_42POSTBLFMT) \
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? ((fs)->fs_space) \
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: ((u_int8_t *)((u_int8_t *)(fs) + (fs)->fs_rotbloff)))
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/*
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* The size of a cylinder group is calculated by CGSIZE. The maximum size
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* is limited by the fact that cylinder groups are at most one block.
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* Its size is derived from the size of the maps maintained in the
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* cylinder group and the (struct cg) size.
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*/
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#define CGSIZE(fs) \
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/* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
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/* blktot size */ (fs)->fs_cpg * sizeof(int32_t) + \
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/* blks size */ (fs)->fs_cpg * (fs)->fs_nrpos * sizeof(int16_t) + \
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/* inode map */ howmany((fs)->fs_ipg, NBBY) + \
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/* block map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPF(fs), NBBY) +\
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/* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
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/* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
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/* cluster map */ howmany((fs)->fs_cpg * (fs)->fs_spc / NSPB(fs), NBBY)))
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/*
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* Convert cylinder group to base address of its global summary info.
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*/
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#define fs_cs(fs, indx) fs_csp[indx]
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/*
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* Cylinder group block for a file system.
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*/
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#define CG_MAGIC 0x090255
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struct cg {
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int32_t cg_firstfield; /* historic cyl groups linked list */
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int32_t cg_magic; /* magic number */
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time_t cg_time; /* time last written */
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int32_t cg_cgx; /* we are the cgx'th cylinder group */
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int16_t cg_ncyl; /* number of cyl's this cg */
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int16_t cg_niblk; /* number of inode blocks this cg */
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int32_t cg_ndblk; /* number of data blocks this cg */
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struct csum cg_cs; /* cylinder summary information */
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int32_t cg_rotor; /* position of last used block */
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int32_t cg_frotor; /* position of last used frag */
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int32_t cg_irotor; /* position of last used inode */
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int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
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int32_t cg_btotoff; /* (int32) block totals per cylinder */
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int32_t cg_boff; /* (u_int16) free block positions */
|
|
int32_t cg_iusedoff; /* (u_int8) used inode map */
|
|
int32_t cg_freeoff; /* (u_int8) free block map */
|
|
int32_t cg_nextfreeoff; /* (u_int8) next available space */
|
|
int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
|
|
int32_t cg_clusteroff; /* (u_int8) free cluster map */
|
|
int32_t cg_nclusterblks; /* number of clusters this cg */
|
|
int32_t cg_sparecon[13]; /* reserved for future use */
|
|
u_int8_t cg_space[1]; /* space for cylinder group maps */
|
|
/* actually longer */
|
|
};
|
|
|
|
/*
|
|
* Macros for access to cylinder group array structures
|
|
*/
|
|
#define cg_blktot(cgp) \
|
|
(((cgp)->cg_magic != CG_MAGIC) \
|
|
? (((struct ocg *)(cgp))->cg_btot) \
|
|
: ((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_btotoff)))
|
|
#define cg_blks(fs, cgp, cylno) \
|
|
(((cgp)->cg_magic != CG_MAGIC) \
|
|
? (((struct ocg *)(cgp))->cg_b[cylno]) \
|
|
: ((int16_t *)((u_int8_t *)(cgp) + \
|
|
(cgp)->cg_boff) + (cylno) * (fs)->fs_nrpos))
|
|
#define cg_inosused(cgp) \
|
|
(((cgp)->cg_magic != CG_MAGIC) \
|
|
? (((struct ocg *)(cgp))->cg_iused) \
|
|
: ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_iusedoff)))
|
|
#define cg_blksfree(cgp) \
|
|
(((cgp)->cg_magic != CG_MAGIC) \
|
|
? (((struct ocg *)(cgp))->cg_free) \
|
|
: ((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_freeoff)))
|
|
#define cg_chkmagic(cgp) \
|
|
((cgp)->cg_magic == CG_MAGIC || ((struct ocg *)(cgp))->cg_magic == CG_MAGIC)
|
|
#define cg_clustersfree(cgp) \
|
|
((u_int8_t *)((u_int8_t *)(cgp) + (cgp)->cg_clusteroff))
|
|
#define cg_clustersum(cgp) \
|
|
((int32_t *)((u_int8_t *)(cgp) + (cgp)->cg_clustersumoff))
|
|
|
|
/*
|
|
* The following structure is defined
|
|
* for compatibility with old file systems.
|
|
*/
|
|
struct ocg {
|
|
int32_t cg_firstfield; /* historic linked list of cyl groups */
|
|
int32_t cg_unused_1; /* used for incore cyl groups */
|
|
time_t cg_time; /* time last written */
|
|
int32_t cg_cgx; /* we are the cgx'th cylinder group */
|
|
int16_t cg_ncyl; /* number of cyl's this cg */
|
|
int16_t cg_niblk; /* number of inode blocks this cg */
|
|
int32_t cg_ndblk; /* number of data blocks this cg */
|
|
struct csum cg_cs; /* cylinder summary information */
|
|
int32_t cg_rotor; /* position of last used block */
|
|
int32_t cg_frotor; /* position of last used frag */
|
|
int32_t cg_irotor; /* position of last used inode */
|
|
int32_t cg_frsum[8]; /* counts of available frags */
|
|
int32_t cg_btot[32]; /* block totals per cylinder */
|
|
int16_t cg_b[32][8]; /* positions of free blocks */
|
|
u_int8_t cg_iused[256]; /* used inode map */
|
|
int32_t cg_magic; /* magic number */
|
|
u_int8_t cg_free[1]; /* free block map */
|
|
/* actually longer */
|
|
};
|
|
|
|
/*
|
|
* Turn file system block numbers into disk block addresses.
|
|
* This maps file system blocks to device size blocks.
|
|
*/
|
|
#define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
|
|
#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
|
|
|
|
/*
|
|
* Cylinder group macros to locate things in cylinder groups.
|
|
* They calc file system addresses of cylinder group data structures.
|
|
*/
|
|
#define cgbase(fs, c) ((ufs_daddr_t)((fs)->fs_fpg * (c)))
|
|
#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
|
|
#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
|
|
#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
|
|
#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
|
|
#define cgstart(fs, c) \
|
|
(cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask)))
|
|
|
|
/*
|
|
* Macros for handling inode numbers:
|
|
* inode number to file system block offset.
|
|
* inode number to cylinder group number.
|
|
* inode number to file system block address.
|
|
*/
|
|
#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
|
|
#define ino_to_fsba(fs, x) \
|
|
((ufs_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
|
|
(blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
|
|
#define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
|
|
|
|
/*
|
|
* Give cylinder group number for a file system block.
|
|
* Give cylinder group block number for a file system block.
|
|
*/
|
|
#define dtog(fs, d) ((d) / (fs)->fs_fpg)
|
|
#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
|
|
|
|
/*
|
|
* Extract the bits for a block from a map.
|
|
* Compute the cylinder and rotational position of a cyl block addr.
|
|
*/
|
|
#define blkmap(fs, map, loc) \
|
|
(((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
|
|
#define cbtocylno(fs, bno) \
|
|
((bno) * NSPF(fs) / (fs)->fs_spc)
|
|
#define cbtorpos(fs, bno) \
|
|
(((bno) * NSPF(fs) % (fs)->fs_spc / (fs)->fs_nsect * (fs)->fs_trackskew + \
|
|
(bno) * NSPF(fs) % (fs)->fs_spc % (fs)->fs_nsect * (fs)->fs_interleave) % \
|
|
(fs)->fs_nsect * (fs)->fs_nrpos / (fs)->fs_npsect)
|
|
|
|
/*
|
|
* The following macros optimize certain frequently calculated
|
|
* quantities by using shifts and masks in place of divisions
|
|
* modulos and multiplications.
|
|
*/
|
|
#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
|
|
((loc) & (fs)->fs_qbmask)
|
|
#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
|
|
((loc) & (fs)->fs_qfmask)
|
|
#define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
|
|
((off_t)(blk) << (fs)->fs_bshift)
|
|
/* Use this only when `blk' is known to be small, e.g., < NDADDR. */
|
|
#define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \
|
|
((blk) << (fs)->fs_bshift)
|
|
#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
|
|
((loc) >> (fs)->fs_bshift)
|
|
#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
|
|
((loc) >> (fs)->fs_fshift)
|
|
#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
|
|
(((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
|
|
#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
|
|
(((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
|
|
#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
|
|
((frags) >> (fs)->fs_fragshift)
|
|
#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
|
|
((blks) << (fs)->fs_fragshift)
|
|
#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
|
|
((fsb) & ((fs)->fs_frag - 1))
|
|
#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
|
|
((fsb) &~ ((fs)->fs_frag - 1))
|
|
|
|
/*
|
|
* Determine the number of available frags given a
|
|
* percentage to hold in reserve.
|
|
*/
|
|
#define freespace(fs, percentreserved) \
|
|
(blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
|
|
(fs)->fs_cstotal.cs_nffree - \
|
|
((off_t)((fs)->fs_dsize) * (percentreserved) / 100))
|
|
|
|
/*
|
|
* Determining the size of a file block in the file system.
|
|
*/
|
|
#define blksize(fs, ip, lbn) \
|
|
(((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \
|
|
? (fs)->fs_bsize \
|
|
: (fragroundup(fs, blkoff(fs, (ip)->i_size))))
|
|
#define dblksize(fs, dip, lbn) \
|
|
(((lbn) >= NDADDR || \
|
|
(dip)->di_size >= (u_int64_t)smalllblktosize(fs, (lbn) + 1)) \
|
|
? (fs)->fs_bsize \
|
|
: (fragroundup(fs, blkoff(fs, (dip)->di_size))))
|
|
#define sblksize(fs, size, lbn) \
|
|
(((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
|
|
? (fs)->fs_bsize \
|
|
: (fragroundup(fs, blkoff(fs, (size)))))
|
|
|
|
|
|
/*
|
|
* Number of disk sectors per block/fragment; assumes DEV_BSIZE byte
|
|
* sector size.
|
|
*/
|
|
#define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift)
|
|
#define NSPF(fs) ((fs)->fs_nspf)
|
|
|
|
/*
|
|
* Number of inodes in a secondary storage block/fragment.
|
|
*/
|
|
#define INOPB(fs) ((fs)->fs_inopb)
|
|
#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
|
|
|
|
/*
|
|
* Number of indirects in a file system block.
|
|
*/
|
|
#define NINDIR(fs) ((fs)->fs_nindir)
|
|
|
|
extern int inside[], around[];
|
|
extern u_char *fragtbl[];
|
|
|
|
#endif
|