From 7111645d3c46e55b2c180e3db0ba8a3c670a3c31 Mon Sep 17 00:00:00 2001 From: Jelmer Vernooij Date: Tue, 16 Sep 2008 15:16:31 +0200 Subject: Use single copy of tdb in both samba3 and samba4. --- source4/lib/tdb/common/io.c | 473 -------------------------------------------- 1 file changed, 473 deletions(-) delete mode 100644 source4/lib/tdb/common/io.c (limited to 'source4/lib/tdb/common/io.c') diff --git a/source4/lib/tdb/common/io.c b/source4/lib/tdb/common/io.c deleted file mode 100644 index 661f761489..0000000000 --- a/source4/lib/tdb/common/io.c +++ /dev/null @@ -1,473 +0,0 @@ - /* - Unix SMB/CIFS implementation. - - trivial database library - - Copyright (C) Andrew Tridgell 1999-2005 - Copyright (C) Paul `Rusty' Russell 2000 - Copyright (C) Jeremy Allison 2000-2003 - - ** 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 3 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, see . -*/ - - -#include "tdb_private.h" - -/* check for an out of bounds access - if it is out of bounds then - see if the database has been expanded by someone else and expand - if necessary - note that "len" is the minimum length needed for the db -*/ -static int tdb_oob(struct tdb_context *tdb, tdb_off_t len, int probe) -{ - struct stat st; - if (len <= tdb->map_size) - return 0; - if (tdb->flags & TDB_INTERNAL) { - if (!probe) { - /* Ensure ecode is set for log fn. */ - tdb->ecode = TDB_ERR_IO; - TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %d beyond internal malloc size %d\n", - (int)len, (int)tdb->map_size)); - } - return TDB_ERRCODE(TDB_ERR_IO, -1); - } - - if (fstat(tdb->fd, &st) == -1) { - return TDB_ERRCODE(TDB_ERR_IO, -1); - } - - if (st.st_size < (size_t)len) { - if (!probe) { - /* Ensure ecode is set for log fn. */ - tdb->ecode = TDB_ERR_IO; - TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_oob len %d beyond eof at %d\n", - (int)len, (int)st.st_size)); - } - return TDB_ERRCODE(TDB_ERR_IO, -1); - } - - /* Unmap, update size, remap */ - if (tdb_munmap(tdb) == -1) - return TDB_ERRCODE(TDB_ERR_IO, -1); - tdb->map_size = st.st_size; - tdb_mmap(tdb); - return 0; -} - -/* write a lump of data at a specified offset */ -static int tdb_write(struct tdb_context *tdb, tdb_off_t off, - const void *buf, tdb_len_t len) -{ - if (len == 0) { - return 0; - } - - if (tdb->read_only || tdb->traverse_read) { - tdb->ecode = TDB_ERR_RDONLY; - return -1; - } - - if (tdb->methods->tdb_oob(tdb, off + len, 0) != 0) - return -1; - - if (tdb->map_ptr) { - memcpy(off + (char *)tdb->map_ptr, buf, len); - } else { - ssize_t written = pwrite(tdb->fd, buf, len, off); - if ((written != (ssize_t)len) && (written != -1)) { - /* try once more */ - TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_write: wrote only " - "%d of %d bytes at %d, trying once more\n", - (int)written, len, off)); - errno = ENOSPC; - written = pwrite(tdb->fd, (const void *)((const char *)buf+written), - len-written, - off+written); - } - if (written == -1) { - /* Ensure ecode is set for log fn. */ - tdb->ecode = TDB_ERR_IO; - TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_write failed at %d " - "len=%d (%s)\n", off, len, strerror(errno))); - return TDB_ERRCODE(TDB_ERR_IO, -1); - } else if (written != (ssize_t)len) { - TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_write: failed to " - "write %d bytes at %d in two attempts\n", - len, off)); - errno = ENOSPC; - return TDB_ERRCODE(TDB_ERR_IO, -1); - } - } - return 0; -} - -/* Endian conversion: we only ever deal with 4 byte quantities */ -void *tdb_convert(void *buf, uint32_t size) -{ - uint32_t i, *p = (uint32_t *)buf; - for (i = 0; i < size / 4; i++) - p[i] = TDB_BYTEREV(p[i]); - return buf; -} - - -/* read a lump of data at a specified offset, maybe convert */ -static int tdb_read(struct tdb_context *tdb, tdb_off_t off, void *buf, - tdb_len_t len, int cv) -{ - if (tdb->methods->tdb_oob(tdb, off + len, 0) != 0) { - return -1; - } - - if (tdb->map_ptr) { - memcpy(buf, off + (char *)tdb->map_ptr, len); - } else { - ssize_t ret = pread(tdb->fd, buf, len, off); - if (ret != (ssize_t)len) { - /* Ensure ecode is set for log fn. */ - tdb->ecode = TDB_ERR_IO; - TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_read failed at %d " - "len=%d ret=%d (%s) map_size=%d\n", - (int)off, (int)len, (int)ret, strerror(errno), - (int)tdb->map_size)); - return TDB_ERRCODE(TDB_ERR_IO, -1); - } - } - if (cv) { - tdb_convert(buf, len); - } - return 0; -} - - - -/* - do an unlocked scan of the hash table heads to find the next non-zero head. The value - will then be confirmed with the lock held -*/ -static void tdb_next_hash_chain(struct tdb_context *tdb, uint32_t *chain) -{ - uint32_t h = *chain; - if (tdb->map_ptr) { - for (;h < tdb->header.hash_size;h++) { - if (0 != *(uint32_t *)(TDB_HASH_TOP(h) + (unsigned char *)tdb->map_ptr)) { - break; - } - } - } else { - uint32_t off=0; - for (;h < tdb->header.hash_size;h++) { - if (tdb_ofs_read(tdb, TDB_HASH_TOP(h), &off) != 0 || off != 0) { - break; - } - } - } - (*chain) = h; -} - - -int tdb_munmap(struct tdb_context *tdb) -{ - if (tdb->flags & TDB_INTERNAL) - return 0; - -#ifdef HAVE_MMAP - if (tdb->map_ptr) { - int ret; - - ret = munmap(tdb->map_ptr, tdb->map_size); - if (ret != 0) - return ret; - } -#endif - tdb->map_ptr = NULL; - return 0; -} - -void tdb_mmap(struct tdb_context *tdb) -{ - if (tdb->flags & TDB_INTERNAL) - return; - -#ifdef HAVE_MMAP - if (!(tdb->flags & TDB_NOMMAP)) { - tdb->map_ptr = mmap(NULL, tdb->map_size, - PROT_READ|(tdb->read_only? 0:PROT_WRITE), - MAP_SHARED|MAP_FILE, tdb->fd, 0); - - /* - * NB. When mmap fails it returns MAP_FAILED *NOT* NULL !!!! - */ - - if (tdb->map_ptr == MAP_FAILED) { - tdb->map_ptr = NULL; - TDB_LOG((tdb, TDB_DEBUG_WARNING, "tdb_mmap failed for size %d (%s)\n", - tdb->map_size, strerror(errno))); - } - } else { - tdb->map_ptr = NULL; - } -#else - tdb->map_ptr = NULL; -#endif -} - -/* expand a file. we prefer to use ftruncate, as that is what posix - says to use for mmap expansion */ -static int tdb_expand_file(struct tdb_context *tdb, tdb_off_t size, tdb_off_t addition) -{ - char buf[8192]; - - if (tdb->read_only || tdb->traverse_read) { - tdb->ecode = TDB_ERR_RDONLY; - return -1; - } - - if (ftruncate(tdb->fd, size+addition) == -1) { - char b = 0; - ssize_t written = pwrite(tdb->fd, &b, 1, (size+addition) - 1); - if (written == 0) { - /* try once more, potentially revealing errno */ - written = pwrite(tdb->fd, &b, 1, (size+addition) - 1); - } - if (written == 0) { - /* again - give up, guessing errno */ - errno = ENOSPC; - } - if (written != 1) { - TDB_LOG((tdb, TDB_DEBUG_FATAL, "expand_file to %d failed (%s)\n", - size+addition, strerror(errno))); - return -1; - } - } - - /* now fill the file with something. This ensures that the - file isn't sparse, which would be very bad if we ran out of - disk. This must be done with write, not via mmap */ - memset(buf, TDB_PAD_BYTE, sizeof(buf)); - while (addition) { - size_t n = addition>sizeof(buf)?sizeof(buf):addition; - ssize_t written = pwrite(tdb->fd, buf, n, size); - if (written == 0) { - /* prevent infinite loops: try _once_ more */ - written = pwrite(tdb->fd, buf, n, size); - } - if (written == 0) { - /* give up, trying to provide a useful errno */ - TDB_LOG((tdb, TDB_DEBUG_FATAL, "expand_file write " - "returned 0 twice: giving up!\n")); - errno = ENOSPC; - return -1; - } else if (written == -1) { - TDB_LOG((tdb, TDB_DEBUG_FATAL, "expand_file write of " - "%d bytes failed (%s)\n", (int)n, - strerror(errno))); - return -1; - } else if (written != n) { - TDB_LOG((tdb, TDB_DEBUG_WARNING, "expand_file: wrote " - "only %d of %d bytes - retrying\n", (int)written, - (int)n)); - } - addition -= written; - size += written; - } - return 0; -} - - -/* expand the database at least size bytes by expanding the underlying - file and doing the mmap again if necessary */ -int tdb_expand(struct tdb_context *tdb, tdb_off_t size) -{ - struct list_struct rec; - tdb_off_t offset, new_size; - - if (tdb_lock(tdb, -1, F_WRLCK) == -1) { - TDB_LOG((tdb, TDB_DEBUG_ERROR, "lock failed in tdb_expand\n")); - return -1; - } - - /* must know about any previous expansions by another process */ - tdb->methods->tdb_oob(tdb, tdb->map_size + 1, 1); - - /* always make room for at least 100 more records, and at - least 25% more space. Round the database up to a multiple - of the page size */ - new_size = MAX(tdb->map_size + size*100, tdb->map_size * 1.25); - size = TDB_ALIGN(new_size, tdb->page_size) - tdb->map_size; - - if (!(tdb->flags & TDB_INTERNAL)) - tdb_munmap(tdb); - - /* - * We must ensure the file is unmapped before doing this - * to ensure consistency with systems like OpenBSD where - * writes and mmaps are not consistent. - */ - - /* expand the file itself */ - if (!(tdb->flags & TDB_INTERNAL)) { - if (tdb->methods->tdb_expand_file(tdb, tdb->map_size, size) != 0) - goto fail; - } - - tdb->map_size += size; - - if (tdb->flags & TDB_INTERNAL) { - char *new_map_ptr = (char *)realloc(tdb->map_ptr, - tdb->map_size); - if (!new_map_ptr) { - tdb->map_size -= size; - goto fail; - } - tdb->map_ptr = new_map_ptr; - } else { - /* - * We must ensure the file is remapped before adding the space - * to ensure consistency with systems like OpenBSD where - * writes and mmaps are not consistent. - */ - - /* We're ok if the mmap fails as we'll fallback to read/write */ - tdb_mmap(tdb); - } - - /* form a new freelist record */ - memset(&rec,'\0',sizeof(rec)); - rec.rec_len = size - sizeof(rec); - - /* link it into the free list */ - offset = tdb->map_size - size; - if (tdb_free(tdb, offset, &rec) == -1) - goto fail; - - tdb_unlock(tdb, -1, F_WRLCK); - return 0; - fail: - tdb_unlock(tdb, -1, F_WRLCK); - return -1; -} - -/* read/write a tdb_off_t */ -int tdb_ofs_read(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d) -{ - return tdb->methods->tdb_read(tdb, offset, (char*)d, sizeof(*d), DOCONV()); -} - -int tdb_ofs_write(struct tdb_context *tdb, tdb_off_t offset, tdb_off_t *d) -{ - tdb_off_t off = *d; - return tdb->methods->tdb_write(tdb, offset, CONVERT(off), sizeof(*d)); -} - - -/* read a lump of data, allocating the space for it */ -unsigned char *tdb_alloc_read(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t len) -{ - unsigned char *buf; - - /* some systems don't like zero length malloc */ - if (len == 0) { - len = 1; - } - - if (!(buf = (unsigned char *)malloc(len))) { - /* Ensure ecode is set for log fn. */ - tdb->ecode = TDB_ERR_OOM; - TDB_LOG((tdb, TDB_DEBUG_ERROR,"tdb_alloc_read malloc failed len=%d (%s)\n", - len, strerror(errno))); - return TDB_ERRCODE(TDB_ERR_OOM, buf); - } - if (tdb->methods->tdb_read(tdb, offset, buf, len, 0) == -1) { - SAFE_FREE(buf); - return NULL; - } - return buf; -} - -/* Give a piece of tdb data to a parser */ - -int tdb_parse_data(struct tdb_context *tdb, TDB_DATA key, - tdb_off_t offset, tdb_len_t len, - int (*parser)(TDB_DATA key, TDB_DATA data, - void *private_data), - void *private_data) -{ - TDB_DATA data; - int result; - - data.dsize = len; - - if ((tdb->transaction == NULL) && (tdb->map_ptr != NULL)) { - /* - * Optimize by avoiding the malloc/memcpy/free, point the - * parser directly at the mmap area. - */ - if (tdb->methods->tdb_oob(tdb, offset+len, 0) != 0) { - return -1; - } - data.dptr = offset + (unsigned char *)tdb->map_ptr; - return parser(key, data, private_data); - } - - if (!(data.dptr = tdb_alloc_read(tdb, offset, len))) { - return -1; - } - - result = parser(key, data, private_data); - free(data.dptr); - return result; -} - -/* read/write a record */ -int tdb_rec_read(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec) -{ - if (tdb->methods->tdb_read(tdb, offset, rec, sizeof(*rec),DOCONV()) == -1) - return -1; - if (TDB_BAD_MAGIC(rec)) { - /* Ensure ecode is set for log fn. */ - tdb->ecode = TDB_ERR_CORRUPT; - TDB_LOG((tdb, TDB_DEBUG_FATAL,"tdb_rec_read bad magic 0x%x at offset=%d\n", rec->magic, offset)); - return TDB_ERRCODE(TDB_ERR_CORRUPT, -1); - } - return tdb->methods->tdb_oob(tdb, rec->next+sizeof(*rec), 0); -} - -int tdb_rec_write(struct tdb_context *tdb, tdb_off_t offset, struct list_struct *rec) -{ - struct list_struct r = *rec; - return tdb->methods->tdb_write(tdb, offset, CONVERT(r), sizeof(r)); -} - -static const struct tdb_methods io_methods = { - tdb_read, - tdb_write, - tdb_next_hash_chain, - tdb_oob, - tdb_expand_file, - tdb_brlock -}; - -/* - initialise the default methods table -*/ -void tdb_io_init(struct tdb_context *tdb) -{ - tdb->methods = &io_methods; -} -- cgit