From 19777ba573894f1b93ec9cd130c3b5c084956258 Mon Sep 17 00:00:00 2001 From: guenther Date: Fri, 26 Aug 2016 04:23:44 +0000 Subject: [PATCH] tables.h is only used by tables.c; merge it into the .c file is unnecessary; sort the #includes --- bin/pax/tables.c | 137 +++++++++++++++++++++++++++++++++++++-- bin/pax/tables.h | 165 ----------------------------------------------- 2 files changed, 132 insertions(+), 170 deletions(-) delete mode 100644 bin/pax/tables.h diff --git a/bin/pax/tables.c b/bin/pax/tables.c index 74f01023903..3f29f6fba8d 100644 --- a/bin/pax/tables.c +++ b/bin/pax/tables.c @@ -1,4 +1,4 @@ -/* $OpenBSD: tables.c,v 1.48 2016/08/14 18:30:33 guenther Exp $ */ +/* $OpenBSD: tables.c,v 1.49 2016/08/26 04:23:44 guenther Exp $ */ /* $NetBSD: tables.c,v 1.4 1995/03/21 09:07:45 cgd Exp $ */ /*- @@ -35,18 +35,17 @@ */ #include -#include #include +#include #include #include #include #include +#include #include #include -#include -#include + #include "pax.h" -#include "tables.h" #include "extern.h" /* @@ -64,6 +63,134 @@ * time well spent. */ +/* + * data structures and constants used by the different databases kept by pax + */ + +/* + * Hash Table Sizes MUST BE PRIME, if set too small performance suffers. + * Probably safe to expect 500000 inodes per tape. Assuming good key + * distribution (inodes) chains of under 50 long (worst case) is ok. + */ +#define L_TAB_SZ 2503 /* hard link hash table size */ +#define F_TAB_SZ 50503 /* file time hash table size */ +#define N_TAB_SZ 541 /* interactive rename hash table */ +#define D_TAB_SZ 317 /* unique device mapping table */ +#define A_TAB_SZ 317 /* ftree dir access time reset table */ +#define SL_TAB_SZ 317 /* escape symlink tables */ +#define MAXKEYLEN 64 /* max number of chars for hash */ +#define DIRP_SIZE 64 /* initial size of created dir table */ + +/* + * file hard link structure (hashed by dev/ino and chained) used to find the + * hard links in a file system or with some archive formats (cpio) + */ +typedef struct hrdlnk { + ino_t ino; /* files inode number */ + char *name; /* name of first file seen with this ino/dev */ + dev_t dev; /* files device number */ + u_long nlink; /* expected link count */ + struct hrdlnk *fow; +} HRDLNK; + +/* + * Archive write update file time table (the -u, -C flag), hashed by filename. + * Filenames are stored in a scratch file at seek offset into the file. The + * file time (mod time) and the file name length (for a quick check) are + * stored in a hash table node. We were forced to use a scratch file because + * with -u, the mtime for every node in the archive must always be available + * to compare against (and this data can get REALLY large with big archives). + * By being careful to read only when we have a good chance of a match, the + * performance loss is not measurable (and the size of the archive we can + * handle is greatly increased). + */ +typedef struct ftm { + off_t seek; /* location in scratch file */ + struct timespec mtim; /* files last modification time */ + struct ftm *fow; + int namelen; /* file name length */ +} FTM; + +/* + * Interactive rename table (-i flag), hashed by orig filename. + * We assume this will not be a large table as this mapping data can only be + * obtained through interactive input by the user. Nobody is going to type in + * changes for 500000 files? We use chaining to resolve collisions. + */ + +typedef struct namt { + char *oname; /* old name */ + char *nname; /* new name typed in by the user */ + struct namt *fow; +} NAMT; + +/* + * Unique device mapping tables. Some protocols (e.g. cpio) require that the + * pair will uniquely identify a file in an archive unless they + * are links to the same file. Appending to archives can break this. For those + * protocols that have this requirement we map c_dev to a unique value not seen + * in the archive when we append. We also try to handle inode truncation with + * this table. (When the inode field in the archive header are too small, we + * remap the dev on writes to remove accidental collisions). + * + * The list is hashed by device number using chain collision resolution. Off of + * each DEVT are linked the various remaps for this device based on those bits + * in the inode which were truncated. For example if we are just remapping to + * avoid a device number during an update append, off the DEVT we would have + * only a single DLIST that has a truncation id of 0 (no inode bits were + * stripped for this device so far). When we spot inode truncation we create + * a new mapping based on the set of bits in the inode which were stripped off. + * so if the top four bits of the inode are stripped and they have a pattern of + * 0110...... (where . are those bits not truncated) we would have a mapping + * assigned for all inodes that has the same 0110.... pattern (with this dev + * number of course). This keeps the mapping sparse and should be able to store + * close to the limit of files which can be represented by the optimal + * combination of dev and inode bits, and without creating a fouled up archive. + * Note we also remap truncated devs in the same way (an exercise for the + * dedicated reader; always wanted to say that...:) + */ + +typedef struct devt { + dev_t dev; /* the orig device number we now have to map */ + struct devt *fow; /* new device map list */ + struct dlist *list; /* map list based on inode truncation bits */ +} DEVT; + +typedef struct dlist { + ino_t trunc_bits; /* truncation pattern for a specific map */ + dev_t dev; /* the new device id we use */ + struct dlist *fow; +} DLIST; + +/* + * ftree directory access time reset table. When we are done with a + * subtree we reset the access and mod time of the directory when the tflag is + * set. Not really explicitly specified in the pax spec, but easy and fast to + * do (and this may have even been intended in the spec, it is not clear). + * table is hashed by inode with chaining. + */ + +typedef struct atdir { + struct file_times ft; + struct atdir *fow; +} ATDIR; + +/* + * created directory time and mode storage entry. After pax is finished during + * extraction or copy, we must reset directory access modes and times that + * may have been modified after creation (they no longer have the specified + * times and/or modes). We must reset time in the reverse order of creation, + * because entries are added from the top of the file tree to the bottom. + * We MUST reset times from leaf to root (it will not work the other + * direction). + */ + +typedef struct dirdata { + struct file_times ft; + u_int16_t mode; /* file mode to restore */ + u_int16_t frc_mode; /* do we force mode settings? */ +} DIRDATA; + static HRDLNK **ltab = NULL; /* hard link table for detecting hard links */ static FTM **ftab = NULL; /* file time table for updating arch */ static NAMT **ntab = NULL; /* interactive rename storage table */ diff --git a/bin/pax/tables.h b/bin/pax/tables.h deleted file mode 100644 index 55eeb959284..00000000000 --- a/bin/pax/tables.h +++ /dev/null @@ -1,165 +0,0 @@ -/* $OpenBSD: tables.h,v 1.16 2015/03/19 05:14:24 guenther Exp $ */ -/* $NetBSD: tables.h,v 1.3 1995/03/21 09:07:47 cgd Exp $ */ - -/*- - * Copyright (c) 1992 Keith Muller. - * Copyright (c) 1992, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Keith Muller of the University of California, San Diego. - * - * 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. - * - * @(#)tables.h 8.1 (Berkeley) 5/31/93 - */ - -/* - * data structures and constants used by the different databases kept by pax - */ - -/* - * Hash Table Sizes MUST BE PRIME, if set too small performance suffers. - * Probably safe to expect 500000 inodes per tape. Assuming good key - * distribution (inodes) chains of under 50 long (worst case) is ok. - */ -#define L_TAB_SZ 2503 /* hard link hash table size */ -#define F_TAB_SZ 50503 /* file time hash table size */ -#define N_TAB_SZ 541 /* interactive rename hash table */ -#define D_TAB_SZ 317 /* unique device mapping table */ -#define A_TAB_SZ 317 /* ftree dir access time reset table */ -#define SL_TAB_SZ 317 /* escape symlink tables */ -#define MAXKEYLEN 64 /* max number of chars for hash */ -#define DIRP_SIZE 64 /* initial size of created dir table */ - -/* - * file hard link structure (hashed by dev/ino and chained) used to find the - * hard links in a file system or with some archive formats (cpio) - */ -typedef struct hrdlnk { - ino_t ino; /* files inode number */ - char *name; /* name of first file seen with this ino/dev */ - dev_t dev; /* files device number */ - u_long nlink; /* expected link count */ - struct hrdlnk *fow; -} HRDLNK; - -/* - * Archive write update file time table (the -u, -C flag), hashed by filename. - * Filenames are stored in a scratch file at seek offset into the file. The - * file time (mod time) and the file name length (for a quick check) are - * stored in a hash table node. We were forced to use a scratch file because - * with -u, the mtime for every node in the archive must always be available - * to compare against (and this data can get REALLY large with big archives). - * By being careful to read only when we have a good chance of a match, the - * performance loss is not measurable (and the size of the archive we can - * handle is greatly increased). - */ -typedef struct ftm { - off_t seek; /* location in scratch file */ - struct timespec mtim; /* files last modification time */ - struct ftm *fow; - int namelen; /* file name length */ -} FTM; - -/* - * Interactive rename table (-i flag), hashed by orig filename. - * We assume this will not be a large table as this mapping data can only be - * obtained through interactive input by the user. Nobody is going to type in - * changes for 500000 files? We use chaining to resolve collisions. - */ - -typedef struct namt { - char *oname; /* old name */ - char *nname; /* new name typed in by the user */ - struct namt *fow; -} NAMT; - -/* - * Unique device mapping tables. Some protocols (e.g. cpio) require that the - * pair will uniquely identify a file in an archive unless they - * are links to the same file. Appending to archives can break this. For those - * protocols that have this requirement we map c_dev to a unique value not seen - * in the archive when we append. We also try to handle inode truncation with - * this table. (When the inode field in the archive header are too small, we - * remap the dev on writes to remove accidental collisions). - * - * The list is hashed by device number using chain collision resolution. Off of - * each DEVT are linked the various remaps for this device based on those bits - * in the inode which were truncated. For example if we are just remapping to - * avoid a device number during an update append, off the DEVT we would have - * only a single DLIST that has a truncation id of 0 (no inode bits were - * stripped for this device so far). When we spot inode truncation we create - * a new mapping based on the set of bits in the inode which were stripped off. - * so if the top four bits of the inode are stripped and they have a pattern of - * 0110...... (where . are those bits not truncated) we would have a mapping - * assigned for all inodes that has the same 0110.... pattern (with this dev - * number of course). This keeps the mapping sparse and should be able to store - * close to the limit of files which can be represented by the optimal - * combination of dev and inode bits, and without creating a fouled up archive. - * Note we also remap truncated devs in the same way (an exercise for the - * dedicated reader; always wanted to say that...:) - */ - -typedef struct devt { - dev_t dev; /* the orig device number we now have to map */ - struct devt *fow; /* new device map list */ - struct dlist *list; /* map list based on inode truncation bits */ -} DEVT; - -typedef struct dlist { - ino_t trunc_bits; /* truncation pattern for a specific map */ - dev_t dev; /* the new device id we use */ - struct dlist *fow; -} DLIST; - -/* - * ftree directory access time reset table. When we are done with a - * subtree we reset the access and mod time of the directory when the tflag is - * set. Not really explicitly specified in the pax spec, but easy and fast to - * do (and this may have even been intended in the spec, it is not clear). - * table is hashed by inode with chaining. - */ - -typedef struct atdir { - struct file_times ft; - struct atdir *fow; -} ATDIR; - -/* - * created directory time and mode storage entry. After pax is finished during - * extraction or copy, we must reset directory access modes and times that - * may have been modified after creation (they no longer have the specified - * times and/or modes). We must reset time in the reverse order of creation, - * because entries are added from the top of the file tree to the bottom. - * We MUST reset times from leaf to root (it will not work the other - * direction). - */ - -typedef struct dirdata { - struct file_times ft; - u_int16_t mode; /* file mode to restore */ - u_int16_t frc_mode; /* do we force mode settings? */ -} DIRDATA; -- 2.20.1