8a16b7a18f
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
172 lines
7.5 KiB
C
172 lines
7.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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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. 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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* @(#)tables.h 8.1 (Berkeley) 5/31/93
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* $FreeBSD$
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*/
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/*
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* data structures and constants used by the different databases kept by pax
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*/
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/*
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* Hash Table Sizes MUST BE PRIME, if set too small performance suffers.
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* Probably safe to expect 500000 inodes per tape. Assuming good key
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* distribution (inodes) chains of under 50 long (worse case) is ok.
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*/
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#define L_TAB_SZ 2503 /* hard link hash table size */
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#define F_TAB_SZ 50503 /* file time hash table size */
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#define N_TAB_SZ 541 /* interactive rename hash table */
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#define D_TAB_SZ 317 /* unique device mapping table */
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#define A_TAB_SZ 317 /* ftree dir access time reset table */
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#define MAXKEYLEN 64 /* max number of chars for hash */
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/*
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* file hard link structure (hashed by dev/ino and chained) used to find the
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* hard links in a file system or with some archive formats (cpio)
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*/
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typedef struct hrdlnk {
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char *name; /* name of first file seen with this ino/dev */
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dev_t dev; /* files device number */
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ino_t ino; /* files inode number */
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u_long nlink; /* expected link count */
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struct hrdlnk *fow;
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} HRDLNK;
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/*
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* Archive write update file time table (the -u, -C flag), hashed by filename.
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* Filenames are stored in a scratch file at seek offset into the file. The
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* file time (mod time) and the file name length (for a quick check) are
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* stored in a hash table node. We were forced to use a scratch file because
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* with -u, the mtime for every node in the archive must always be available
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* to compare against (and this data can get REALLY large with big archives).
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* By being careful to read only when we have a good chance of a match, the
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* performance loss is not measurable (and the size of the archive we can
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* handle is greatly increased).
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*/
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typedef struct ftm {
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int namelen; /* file name length */
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time_t mtime; /* files last modification time */
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off_t seek; /* location in scratch file */
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struct ftm *fow;
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} FTM;
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/*
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* Interactive rename table (-i flag), hashed by orig filename.
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* We assume this will not be a large table as this mapping data can only be
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* obtained through interactive input by the user. Nobody is going to type in
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* changes for 500000 files? We use chaining to resolve collisions.
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*/
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typedef struct namt {
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char *oname; /* old name */
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char *nname; /* new name typed in by the user */
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struct namt *fow;
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} NAMT;
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/*
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* Unique device mapping tables. Some protocols (e.g. cpio) require that the
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* <c_dev,c_ino> pair will uniquely identify a file in an archive unless they
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* are links to the same file. Appending to archives can break this. For those
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* protocols that have this requirement we map c_dev to a unique value not seen
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* in the archive when we append. We also try to handle inode truncation with
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* this table. (When the inode field in the archive header are too small, we
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* remap the dev on writes to remove accidental collisions).
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*
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* The list is hashed by device number using chain collision resolution. Off of
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* each DEVT are linked the various remaps for this device based on those bits
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* in the inode which were truncated. For example if we are just remapping to
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* avoid a device number during an update append, off the DEVT we would have
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* only a single DLIST that has a truncation id of 0 (no inode bits were
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* stripped for this device so far). When we spot inode truncation we create
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* a new mapping based on the set of bits in the inode which were stripped off.
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* so if the top four bits of the inode are stripped and they have a pattern of
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* 0110...... (where . are those bits not truncated) we would have a mapping
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* assigned for all inodes that has the same 0110.... pattern (with this dev
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* number of course). This keeps the mapping sparse and should be able to store
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* close to the limit of files which can be represented by the optimal
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* combination of dev and inode bits, and without creating a fouled up archive.
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* Note we also remap truncated devs in the same way (an exercise for the
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* dedicated reader; always wanted to say that...:)
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*/
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typedef struct devt {
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dev_t dev; /* the orig device number we now have to map */
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struct devt *fow; /* new device map list */
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struct dlist *list; /* map list based on inode truncation bits */
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} DEVT;
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typedef struct dlist {
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ino_t trunc_bits; /* truncation pattern for a specific map */
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dev_t dev; /* the new device id we use */
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struct dlist *fow;
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} DLIST;
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/*
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* ftree directory access time reset table. When we are done with with a
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* subtree we reset the access and mod time of the directory when the tflag is
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* set. Not really explicitly specified in the pax spec, but easy and fast to
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* do (and this may have even been intended in the spec, it is not clear).
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* table is hashed by inode with chaining.
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*/
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typedef struct atdir {
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char *name; /* name of directory to reset */
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dev_t dev; /* dev and inode for fast lookup */
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ino_t ino;
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time_t mtime; /* access and mod time to reset to */
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time_t atime;
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struct atdir *fow;
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} ATDIR;
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/*
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* created directory time and mode storage entry. After pax is finished during
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* extraction or copy, we must reset directory access modes and times that
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* may have been modified after creation (they no longer have the specified
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* times and/or modes). We must reset time in the reverse order of creation,
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* because entries are added from the top of the file tree to the bottom.
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* We MUST reset times from leaf to root (it will not work the other
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* direction). Entries are recorded into a spool file to make reverse
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* reading faster.
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*/
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typedef struct dirdata {
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int nlen; /* length of the directory name (includes \0) */
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off_t npos; /* position in file where this dir name starts */
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mode_t mode; /* file mode to restore */
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time_t mtime; /* mtime to set */
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time_t atime; /* atime to set */
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int frc_mode; /* do we force mode settings? */
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} DIRDATA;
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