fuse-ext2-0.0.7

/* URL: svn://svnanon.samba.org/samba/branches/SAMBA_4_0/source/lib/tdb/common Rev: 23590 Last Changed Date: 2007-06-22 13:36:10 -0400 (Fri, 22 Jun 2007) */ /* trivial database library - standalone version Copyright (C) Andrew Tridgell 1999-2005 Copyright (C) Jeremy Allison 2000-2006 Copyright (C) Paul `Rusty' Russell 2000 ** NOTE! The following LGPL license applies to the tdb ** library. This does NOT imply that all of Samba is released ** under the LGPL This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifdef CONFIG_STAND_ALONE #define HAVE_MMAP #define HAVE_STRDUP #define HAVE_SYS_MMAN_H #define HAVE_UTIME_H #define HAVE_UTIME #endif #define _XOPEN_SOURCE 600 #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <stddef.h> #include <errno.h> #include <string.h> #ifdef HAVE_SYS_SELECT_H #include <sys/select.h> #endif #include <sys/time.h> #include <sys/types.h> #include <time.h> #ifdef HAVE_UTIME_H #include <utime.h> #endif #include <sys/stat.h> #include <sys/file.h> #include <fcntl.h> #ifdef HAVE_SYS_MMAN_H #include <sys/mman.h> #endif #ifndef MAP_FILE #define MAP_FILE 0 #endif #ifndef MAP_FAILED #define MAP_FAILED ((void *)-1) #endif #ifndef HAVE_STRDUP #define strdup rep_strdup static char *rep_strdup(const char *s) { char *ret; int length; if (!s) return NULL; if (!length) length = strlen(s); ret = malloc(length + 1); if (ret) { strncpy(ret, s, length); ret[length] = '\0'; } return ret; } #endif #ifndef PRINTF_ATTRIBUTE #if (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) /** Use gcc attribute to check printf fns. a1 is the 1-based index of * the parameter containing the format, and a2 the index of the first * argument. Note that some gcc 2.x versions don't handle this * properly **/ #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2))) #else #define PRINTF_ATTRIBUTE(a1, a2) #endif #endif typedef int bool; #include "tdb.h" #ifndef u32 #define u32 unsigned #endif #ifndef HAVE_GETPAGESIZE #define getpagesize() 0x2000 #endif typedef u32 tdb_len_t; typedef u32 tdb_off_t; #ifndef offsetof #define offsetof(t,f) ((unsigned int)&((t *)0)->f) #endif #define TDB_MAGIC_FOOD "TDB file\n" #define TDB_VERSION (0x26011967 + 6) #define TDB_MAGIC (0x26011999U) #define TDB_FREE_MAGIC (~TDB_MAGIC) #define TDB_DEAD_MAGIC (0xFEE1DEAD) #define TDB_RECOVERY_MAGIC (0xf53bc0e7U) #define TDB_ALIGNMENT 4 #define MIN_REC_SIZE (2*sizeof(struct list_struct) + TDB_ALIGNMENT) #define DEFAULT_HASH_SIZE 131 #define FREELIST_TOP (sizeof(struct tdb_header)) #define TDB_ALIGN(x,a) (((x) + (a)-1) & ~((a)-1)) #define TDB_BYTEREV(x) (((((x)&0xff)<<24)|((x)&0xFF00)<<8)|(((x)>>8)&0xFF00)|((x)>>24)) #define TDB_DEAD(r) ((r)->magic == TDB_DEAD_MAGIC) #define TDB_BAD_MAGIC(r) ((r)->magic != TDB_MAGIC && !TDB_DEAD(r)) #define TDB_HASH_TOP(hash) (FREELIST_TOP + (BUCKET(hash)+1)*sizeof(tdb_off_t)) #define TDB_HASHTABLE_SIZE(tdb) ((tdb->header.hash_size+1)*sizeof(tdb_off_t)) #define TDB_DATA_START(hash_size) TDB_HASH_TOP(hash_size-1) #define TDB_RECOVERY_HEAD offsetof(struct tdb_header, recovery_start) #define TDB_SEQNUM_OFS offsetof(struct tdb_header, sequence_number) #define TDB_PAD_BYTE 0x42 #define TDB_PAD_U32 0x42424242 /* NB assumes there is a local variable called "tdb" that is the * current context, also takes doubly-parenthesized print-style * argument. */ #define TDB_LOG(x) tdb->log.log_fn x /* lock offsets */ #define GLOBAL_LOCK 0 #define ACTIVE_LOCK 4 #define TRANSACTION_LOCK 8 /* free memory if the pointer is valid and zero the pointer */ #ifndef SAFE_FREE #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0) #endif #define BUCKET(hash) ((hash) % tdb->header.hash_size) #define DOCONV() (tdb->flags & TDB_CONVERT) #define CONVERT(x) (DOCONV() ? tdb_convert(&x, sizeof(x)) : &x) /* the body of the database is made of one list_struct for the free space plus a separate data list for each hash value */ struct list_struct { tdb_off_t next; /* offset of the next record in the list */ tdb_len_t rec_len; /* total byte length of record */ tdb_len_t key_len; /* byte length of key */ tdb_len_t data_len; /* byte length of data */ u32 full_hash; /* the full 32 bit hash of the key */ u32 magic; /* try to catch errors */ /* the following union is implied: union { char record[rec_len]; struct { char key[key_len]; char data[data_len]; } u32 totalsize; (tailer) } */ }; /* this is stored at the front of every database */ struct tdb_header { char magic_food[32]; /* for /etc/magic */ u32 version; /* version of the code */ u32 hash_size; /* number of hash entries */ tdb_off_t rwlocks; /* obsolete - kept to detect old formats */ tdb_off_t recovery_start; /* offset of transaction recovery region */ tdb_off_t sequence_number; /* used when TDB_SEQNUM is set */ tdb_off_t reserved[29]; }; struct tdb_lock_type { int list; u32 count; u32 ltype; }; struct tdb_traverse_lock { struct tdb_traverse_lock *next; u32 off; u32 hash; int lock_rw; }; struct tdb_methods { int (*tdb_read)(struct tdb_context *, tdb_off_t , void *, tdb_len_t , int ); int (*tdb_write)(struct tdb_context *, tdb_off_t, const void *, tdb_len_t); void (*next_hash_chain)(struct tdb_context *, u32 *); int (*tdb_oob)(struct tdb_context *, tdb_off_t , int ); int (*tdb_expand_file)(struct tdb_context *, tdb_off_t , tdb_off_t ); int (*tdb_brlock)(struct tdb_context *, tdb_off_t , int, int, int, size_t); }; struct tdb_context { char *name; /* the name of the database */ void *map_ptr; /* where it is currently mapped */ int fd; /* open file descriptor for the database */ tdb_len_t map_size; /* how much space has been mapped */ int read_only; /* opened read-only */ int traverse_read; /* read-only traversal */ struct tdb_lock_type global_lock; int num_lockrecs; struct tdb_lock_type *lockrecs; /* only real locks, all with count>0 */ enum TDB_ERROR ecode; /* error code for last tdb error */ struct tdb_header header; /* a cached copy of the header */ u32 flags; /* the flags passed to tdb_open */ struct tdb_traverse_lock travlocks; /* current traversal locks */ struct tdb_context *next; /* all tdbs to avoid multiple opens */ dev_t device; /* uniquely identifies this tdb */ ino_t inode; /* uniquely identifies this tdb */ struct tdb_logging_context log; unsigned int (*hash_fn)(TDB_DATA *key); int open_flags; /* flags used in the open - needed by reopen */ unsigned int num_locks; /* number of chain locks held */ const struct tdb_methods *methods; struct tdb_transaction *transaction; int page_size; int max_dead_records; bool have_transaction_lock; }; /* internal prototypes */ static int tdb_munmap(struct tdb_context *tdb); static void tdb_mmap(struct tdb_context *tdb); static int tdb_lock(struct tdb_context *tdb, int list, int ltype); static int tdb_unlock(struct tdb_context *tdb, int list, int ltype); static int tdb_brlock(struct tdb_context *tdb, tdb_off_t offset, int rw_type, int lck_type, int probe, size_t len); static int tdb_transaction_lock(struct tdb_context *tdb, int ltype); static int tdb_transaction_unlock(struct tdb_context *tdb); static int tdb_brlock_upgrade(struct tdb_context *tdb, tdb_off_t off