root / vhd / lib / libvhd.c @ abdb293f
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/*
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* Copyright (c) 2008, XenSource Inc.
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* Copyright (c) 2010, Citrix Systems, Inc.
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*
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* 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 are met:
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* * 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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* * 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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* * Neither the name of XenSource Inc. 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h" |
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#endif
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <stdio.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <libgen.h> |
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#include <iconv.h> |
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#include <limits.h> |
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#include <sys/mman.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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|
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#include "libvhd.h" |
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#include "relative-path.h" |
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|
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#define VHD_HEADER_MAX_RETRIES 10 |
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|
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static int libvhd_dbg = 0; |
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|
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void
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libvhd_set_log_level(int level)
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{
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if (level)
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libvhd_dbg = 1;
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} |
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|
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#define VHDLOG(_f, _a...) \
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do { \
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if (libvhd_dbg) \
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syslog(LOG_INFO, "libvhd::%s: "_f, \
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__func__, ##_a); \ |
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} while (0) |
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|
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#define ASSERT(_p) \
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if (!(_p)) { \
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libvhd_set_log_level(1); \
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VHDLOG("%s:%d: FAILED ASSERTION: '%s'\n", \
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__FILE__, __LINE__, #_p); \
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*(int*)0 = 0; \ |
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} |
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|
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#ifdef ENABLE_FAILURE_TESTING
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const char* ENV_VAR_FAIL[NUM_FAIL_TESTS] = { |
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"VHD_UTIL_TEST_FAIL_REPARENT_BEGIN",
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"VHD_UTIL_TEST_FAIL_REPARENT_LOCATOR",
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"VHD_UTIL_TEST_FAIL_REPARENT_END",
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"VHD_UTIL_TEST_FAIL_RESIZE_BEGIN",
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"VHD_UTIL_TEST_FAIL_RESIZE_DATA_MOVED",
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"VHD_UTIL_TEST_FAIL_RESIZE_METADATA_MOVED",
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"VHD_UTIL_TEST_FAIL_RESIZE_END"
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}; |
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int TEST_FAIL[NUM_FAIL_TESTS];
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#endif // ENABLE_FAILURE_TESTING |
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|
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static void vhd_cache_init(vhd_context_t *); |
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static int vhd_cache_enabled(vhd_context_t *); |
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static int vhd_cache_load(vhd_context_t *); |
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static int vhd_cache_unload(vhd_context_t *); |
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static vhd_context_t * vhd_cache_get_parent(vhd_context_t *);
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|
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static inline int |
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old_test_bit(volatile char *addr, int nr) |
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{
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return (((uint32_t *)addr)[nr >> 5] >> (nr & 31)) & 1; |
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} |
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static inline void |
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old_set_bit(volatile char *addr, int nr) |
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{
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((uint32_t *)addr)[nr >> 5] |= (1 << (nr & 31)); |
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} |
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static inline void |
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old_clear_bit(volatile char *addr, int nr) |
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{
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((uint32_t *)addr)[nr >> 5] &= ~(1 << (nr & 31)); |
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} |
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void
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vhd_footer_in(vhd_footer_t *footer) |
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{
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BE32_IN(&footer->features); |
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BE32_IN(&footer->ff_version); |
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BE64_IN(&footer->data_offset); |
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BE32_IN(&footer->timestamp); |
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BE32_IN(&footer->crtr_ver); |
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BE32_IN(&footer->crtr_os); |
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BE64_IN(&footer->orig_size); |
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BE64_IN(&footer->curr_size); |
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BE32_IN(&footer->geometry); |
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BE32_IN(&footer->type); |
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BE32_IN(&footer->checksum); |
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} |
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|
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void
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vhd_footer_out(vhd_footer_t *footer) |
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{
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BE32_OUT(&footer->features); |
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BE32_OUT(&footer->ff_version); |
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BE64_OUT(&footer->data_offset); |
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BE32_OUT(&footer->timestamp); |
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BE32_OUT(&footer->crtr_ver); |
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BE32_OUT(&footer->crtr_os); |
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BE64_OUT(&footer->orig_size); |
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BE64_OUT(&footer->curr_size); |
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BE32_OUT(&footer->geometry); |
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BE32_OUT(&footer->type); |
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BE32_OUT(&footer->checksum); |
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} |
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|
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void
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vhd_header_in(vhd_header_t *header) |
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{
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int i, n;
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BE64_IN(&header->data_offset); |
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BE64_IN(&header->table_offset); |
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BE32_IN(&header->hdr_ver); |
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BE32_IN(&header->max_bat_size); |
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BE32_IN(&header->block_size); |
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BE32_IN(&header->checksum); |
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BE32_IN(&header->prt_ts); |
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n = sizeof(header->loc) / sizeof(vhd_parent_locator_t); |
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for (i = 0; i < n; i++) { |
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BE32_IN(&header->loc[i].code); |
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BE32_IN(&header->loc[i].data_space); |
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BE32_IN(&header->loc[i].data_len); |
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BE64_IN(&header->loc[i].data_offset); |
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} |
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} |
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|
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void
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vhd_header_out(vhd_header_t *header) |
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{
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int i, n;
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BE64_OUT(&header->data_offset); |
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BE64_OUT(&header->table_offset); |
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BE32_OUT(&header->hdr_ver); |
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BE32_OUT(&header->max_bat_size); |
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BE32_OUT(&header->block_size); |
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BE32_OUT(&header->checksum); |
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BE32_OUT(&header->prt_ts); |
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n = sizeof(header->loc) / sizeof(vhd_parent_locator_t); |
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for (i = 0; i < n; i++) { |
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BE32_OUT(&header->loc[i].code); |
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BE32_OUT(&header->loc[i].data_space); |
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BE32_OUT(&header->loc[i].data_len); |
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BE64_OUT(&header->loc[i].data_offset); |
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} |
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} |
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|
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void
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vhd_batmap_header_in(vhd_batmap_t *batmap) |
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{
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BE64_IN(&batmap->header.batmap_offset); |
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BE32_IN(&batmap->header.batmap_size); |
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BE32_IN(&batmap->header.batmap_version); |
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BE32_IN(&batmap->header.checksum); |
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} |
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|
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void
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vhd_batmap_header_out(vhd_batmap_t *batmap) |
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{
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BE64_OUT(&batmap->header.batmap_offset); |
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BE32_OUT(&batmap->header.batmap_size); |
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BE32_OUT(&batmap->header.batmap_version); |
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BE32_OUT(&batmap->header.checksum); |
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} |
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void
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vhd_bat_in(vhd_bat_t *bat) |
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{
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int i;
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for (i = 0; i < bat->entries; i++) |
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BE32_IN(&bat->bat[i]); |
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} |
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|
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void
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vhd_bat_out(vhd_bat_t *bat) |
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{
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int i;
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for (i = 0; i < bat->entries; i++) |
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BE32_OUT(&bat->bat[i]); |
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} |
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|
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uint32_t |
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vhd_checksum_footer(vhd_footer_t *footer) |
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{
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int i;
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unsigned char *blob; |
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uint32_t checksum, tmp; |
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checksum = 0;
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tmp = footer->checksum; |
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footer->checksum = 0;
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|
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blob = (unsigned char *)footer; |
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for (i = 0; i < sizeof(vhd_footer_t); i++) |
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checksum += (uint32_t)blob[i]; |
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|
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footer->checksum = tmp; |
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return ~checksum;
|
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} |
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|
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int
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vhd_validate_footer(vhd_footer_t *footer) |
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{
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int csize;
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uint32_t checksum; |
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csize = sizeof(footer->cookie);
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if (memcmp(footer->cookie, HD_COOKIE, csize) != 0 && |
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memcmp(footer->cookie, VHD_POISON_COOKIE, csize) != 0) {
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char buf[9]; |
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memcpy(buf, footer->cookie, 8);
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buf[8]= '\0'; |
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VHDLOG("invalid footer cookie: %s\n", buf);
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return -EINVAL;
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} |
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checksum = vhd_checksum_footer(footer); |
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if (checksum != footer->checksum) {
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/*
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* early td-util did not re-calculate
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* checksum when marking vhds 'hidden'
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*/
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if (footer->hidden &&
|
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!strncmp(footer->crtr_app, "tap", 3) && |
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(footer->crtr_ver == VHD_VERSION(0, 1) || |
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footer->crtr_ver == VHD_VERSION(1, 1))) { |
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char tmp = footer->hidden;
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footer->hidden = 0;
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checksum = vhd_checksum_footer(footer); |
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footer->hidden = tmp; |
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|
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if (checksum == footer->checksum)
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return 0; |
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} |
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VHDLOG("invalid footer checksum: "
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"footer = 0x%08x, calculated = 0x%08x\n",
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footer->checksum, checksum); |
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return -EINVAL;
|
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} |
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return 0; |
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} |
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|
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uint32_t |
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vhd_checksum_header(vhd_header_t *header) |
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{
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int i;
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unsigned char *blob; |
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uint32_t checksum, tmp; |
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|
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checksum = 0;
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tmp = header->checksum; |
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header->checksum = 0;
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|
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blob = (unsigned char *)header; |
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for (i = 0; i < sizeof(vhd_header_t); i++) |
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checksum += (uint32_t)blob[i]; |
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|
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header->checksum = tmp; |
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return ~checksum;
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} |
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|
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int
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vhd_validate_header(vhd_header_t *header) |
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{
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int i, n;
|
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uint32_t checksum; |
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|
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if (memcmp(header->cookie, DD_COOKIE, 8) != 0) { |
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char buf[9]; |
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memcpy(buf, header->cookie, 8);
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buf[8] = '\0'; |
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VHDLOG("invalid header cookie: %s\n", buf);
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return -EINVAL;
|
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} |
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|
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if (header->hdr_ver != 0x00010000) { |
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VHDLOG("invalid header version 0x%08x\n", header->hdr_ver);
|
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return -EINVAL;
|
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} |
| 331 |
|
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if (header->data_offset != 0xFFFFFFFFFFFFFFFFULL) { |
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VHDLOG("invalid header data_offset 0x%016"PRIx64"\n", |
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header->data_offset); |
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return -EINVAL;
|
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} |
| 337 |
|
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n = sizeof(header->loc) / sizeof(vhd_parent_locator_t); |
| 339 |
for (i = 0; i < n; i++) |
| 340 |
if (vhd_validate_platform_code(header->loc[i].code))
|
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return -EINVAL;
|
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|
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checksum = vhd_checksum_header(header); |
| 344 |
if (checksum != header->checksum) {
|
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VHDLOG("invalid header checksum: "
|
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"header = 0x%08x, calculated = 0x%08x\n",
|
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header->checksum, checksum); |
| 348 |
return -EINVAL;
|
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} |
| 350 |
|
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return 0; |
| 352 |
} |
| 353 |
|
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static inline int |
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vhd_validate_bat(vhd_bat_t *bat) |
| 356 |
{
|
| 357 |
if (!bat->bat)
|
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return -EINVAL;
|
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|
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return 0; |
| 361 |
} |
| 362 |
|
| 363 |
uint32_t |
| 364 |
vhd_checksum_batmap(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 365 |
{
|
| 366 |
int i;
|
| 367 |
char *blob;
|
| 368 |
uint32_t checksum; |
| 369 |
size_t map_size; |
| 370 |
|
| 371 |
blob = batmap->map; |
| 372 |
checksum = 0;
|
| 373 |
|
| 374 |
map_size = vhd_sectors_to_bytes(secs_round_up_no_zero( |
| 375 |
ctx->footer.curr_size >> (VHD_BLOCK_SHIFT + 3)));
|
| 376 |
|
| 377 |
for (i = 0; i < map_size; i++) { |
| 378 |
if (batmap->header.batmap_version == VHD_BATMAP_VERSION(1, 1)) |
| 379 |
checksum += (uint32_t)blob[i]; |
| 380 |
else
|
| 381 |
checksum += (uint32_t)(unsigned char)blob[i]; |
| 382 |
} |
| 383 |
|
| 384 |
return ~checksum;
|
| 385 |
} |
| 386 |
|
| 387 |
int
|
| 388 |
vhd_validate_batmap_header(vhd_batmap_t *batmap) |
| 389 |
{
|
| 390 |
if (memcmp(batmap->header.cookie, VHD_BATMAP_COOKIE, 8)) |
| 391 |
return -EINVAL;
|
| 392 |
|
| 393 |
if (batmap->header.batmap_version > VHD_BATMAP_CURRENT_VERSION)
|
| 394 |
return -EINVAL;
|
| 395 |
|
| 396 |
return 0; |
| 397 |
} |
| 398 |
|
| 399 |
int
|
| 400 |
vhd_validate_batmap(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 401 |
{
|
| 402 |
uint32_t checksum; |
| 403 |
|
| 404 |
if (!batmap->map)
|
| 405 |
return -EINVAL;
|
| 406 |
|
| 407 |
checksum = vhd_checksum_batmap(ctx, batmap); |
| 408 |
if (checksum != batmap->header.checksum)
|
| 409 |
return -EINVAL;
|
| 410 |
|
| 411 |
return 0; |
| 412 |
} |
| 413 |
|
| 414 |
int
|
| 415 |
vhd_batmap_header_offset(vhd_context_t *ctx, off64_t *_off) |
| 416 |
{
|
| 417 |
off64_t off; |
| 418 |
size_t bat; |
| 419 |
|
| 420 |
*_off = 0;
|
| 421 |
|
| 422 |
off = ctx->header.table_offset; |
| 423 |
bat = ctx->header.max_bat_size * sizeof(uint32_t);
|
| 424 |
off += vhd_bytes_padded(bat); |
| 425 |
|
| 426 |
*_off = off; |
| 427 |
return 0; |
| 428 |
} |
| 429 |
|
| 430 |
int
|
| 431 |
vhd_validate_platform_code(uint32_t code) |
| 432 |
{
|
| 433 |
switch (code) {
|
| 434 |
case PLAT_CODE_NONE:
|
| 435 |
case PLAT_CODE_WI2R:
|
| 436 |
case PLAT_CODE_WI2K:
|
| 437 |
case PLAT_CODE_W2RU:
|
| 438 |
case PLAT_CODE_W2KU:
|
| 439 |
case PLAT_CODE_MAC:
|
| 440 |
case PLAT_CODE_MACX:
|
| 441 |
return 0; |
| 442 |
default:
|
| 443 |
VHDLOG("invalid parent locator code %u\n", code);
|
| 444 |
return -EINVAL;
|
| 445 |
} |
| 446 |
} |
| 447 |
|
| 448 |
int
|
| 449 |
vhd_parent_locator_count(vhd_context_t *ctx) |
| 450 |
{
|
| 451 |
return (sizeof(ctx->header.loc) / sizeof(vhd_parent_locator_t)); |
| 452 |
} |
| 453 |
|
| 454 |
int
|
| 455 |
vhd_hidden(vhd_context_t *ctx, int *hidden)
|
| 456 |
{
|
| 457 |
int err;
|
| 458 |
|
| 459 |
*hidden = 0;
|
| 460 |
|
| 461 |
if (vhd_type_dynamic(ctx) && vhd_creator_tapdisk(ctx) &&
|
| 462 |
(ctx->footer.crtr_ver == VHD_VERSION(0, 1) || |
| 463 |
ctx->footer.crtr_ver == VHD_VERSION(1, 1))) { |
| 464 |
vhd_footer_t copy; |
| 465 |
|
| 466 |
err = vhd_read_footer_at(ctx, ©, 0);
|
| 467 |
if (err) {
|
| 468 |
VHDLOG("error reading backup footer of %s: %d\n",
|
| 469 |
ctx->file, err); |
| 470 |
return err;
|
| 471 |
} |
| 472 |
*hidden = copy.hidden; |
| 473 |
} else
|
| 474 |
*hidden = ctx->footer.hidden; |
| 475 |
|
| 476 |
return 0; |
| 477 |
} |
| 478 |
|
| 479 |
int
|
| 480 |
vhd_chain_depth(vhd_context_t *ctx, int *depth)
|
| 481 |
{
|
| 482 |
char *file;
|
| 483 |
int err, cnt;
|
| 484 |
vhd_context_t vhd, *cur; |
| 485 |
|
| 486 |
err = 0;
|
| 487 |
cnt = 0;
|
| 488 |
*depth = 0;
|
| 489 |
file = NULL;
|
| 490 |
cur = ctx; |
| 491 |
|
| 492 |
for (;;) {
|
| 493 |
cnt++; |
| 494 |
|
| 495 |
if (cur->footer.type != HD_TYPE_DIFF)
|
| 496 |
break;
|
| 497 |
|
| 498 |
if (vhd_parent_raw(cur)) {
|
| 499 |
cnt++; |
| 500 |
break;
|
| 501 |
} |
| 502 |
|
| 503 |
err = vhd_parent_locator_get(cur, &file); |
| 504 |
if (err) {
|
| 505 |
file = NULL;
|
| 506 |
break;
|
| 507 |
} |
| 508 |
|
| 509 |
if (cur != ctx) {
|
| 510 |
vhd_close(cur); |
| 511 |
cur = NULL;
|
| 512 |
} |
| 513 |
|
| 514 |
err = vhd_open(&vhd, file, VHD_OPEN_RDONLY); |
| 515 |
if (err)
|
| 516 |
break;
|
| 517 |
|
| 518 |
cur = &vhd; |
| 519 |
free(file); |
| 520 |
file = NULL;
|
| 521 |
} |
| 522 |
|
| 523 |
free(file); |
| 524 |
if (cur && cur != ctx)
|
| 525 |
vhd_close(cur); |
| 526 |
|
| 527 |
if (!err)
|
| 528 |
*depth = cnt; |
| 529 |
|
| 530 |
return err;
|
| 531 |
} |
| 532 |
|
| 533 |
int
|
| 534 |
vhd_batmap_test(vhd_context_t *ctx, vhd_batmap_t *batmap, uint32_t block) |
| 535 |
{
|
| 536 |
if (!vhd_has_batmap(ctx) || !batmap->map)
|
| 537 |
return 0; |
| 538 |
|
| 539 |
if (block >= (batmap->header.batmap_size << (VHD_SECTOR_SHIFT + 3))) |
| 540 |
return 0; |
| 541 |
|
| 542 |
return test_bit(batmap->map, block);
|
| 543 |
} |
| 544 |
|
| 545 |
void
|
| 546 |
vhd_batmap_set(vhd_context_t *ctx, vhd_batmap_t *batmap, uint32_t block) |
| 547 |
{
|
| 548 |
if (!vhd_has_batmap(ctx) || !batmap->map)
|
| 549 |
return;
|
| 550 |
|
| 551 |
if (block >= (batmap->header.batmap_size << (VHD_SECTOR_SHIFT + 3))) |
| 552 |
return;
|
| 553 |
|
| 554 |
set_bit(batmap->map, block); |
| 555 |
} |
| 556 |
|
| 557 |
void
|
| 558 |
vhd_batmap_clear(vhd_context_t *ctx, vhd_batmap_t *batmap, uint32_t block) |
| 559 |
{
|
| 560 |
if (!vhd_has_batmap(ctx) || !batmap->map)
|
| 561 |
return;
|
| 562 |
|
| 563 |
if (block >= (batmap->header.batmap_size << (VHD_SECTOR_SHIFT + 3))) |
| 564 |
return;
|
| 565 |
|
| 566 |
clear_bit(batmap->map, block); |
| 567 |
} |
| 568 |
|
| 569 |
int
|
| 570 |
vhd_bitmap_test(vhd_context_t *ctx, char *map, uint32_t block)
|
| 571 |
{
|
| 572 |
if (vhd_creator_tapdisk(ctx) &&
|
| 573 |
ctx->footer.crtr_ver == 0x00000001)
|
| 574 |
return old_test_bit(map, block);
|
| 575 |
|
| 576 |
return test_bit(map, block);
|
| 577 |
} |
| 578 |
|
| 579 |
void
|
| 580 |
vhd_bitmap_set(vhd_context_t *ctx, char *map, uint32_t block)
|
| 581 |
{
|
| 582 |
if (vhd_creator_tapdisk(ctx) &&
|
| 583 |
ctx->footer.crtr_ver == 0x00000001)
|
| 584 |
return old_set_bit(map, block);
|
| 585 |
|
| 586 |
return set_bit(map, block);
|
| 587 |
} |
| 588 |
|
| 589 |
void
|
| 590 |
vhd_bitmap_clear(vhd_context_t *ctx, char *map, uint32_t block)
|
| 591 |
{
|
| 592 |
if (vhd_creator_tapdisk(ctx) &&
|
| 593 |
ctx->footer.crtr_ver == 0x00000001)
|
| 594 |
return old_clear_bit(map, block);
|
| 595 |
|
| 596 |
return clear_bit(map, block);
|
| 597 |
} |
| 598 |
|
| 599 |
/*
|
| 600 |
* returns absolute offset of the first
|
| 601 |
* byte of the file which is not vhd metadata
|
| 602 |
*/
|
| 603 |
int
|
| 604 |
vhd_end_of_headers(vhd_context_t *ctx, off64_t *end) |
| 605 |
{
|
| 606 |
int err, i, n;
|
| 607 |
uint32_t bat_bytes; |
| 608 |
off64_t eom, bat_end; |
| 609 |
vhd_parent_locator_t *loc; |
| 610 |
|
| 611 |
*end = 0;
|
| 612 |
|
| 613 |
if (!vhd_type_dynamic(ctx))
|
| 614 |
return 0; |
| 615 |
|
| 616 |
eom = ctx->footer.data_offset + sizeof(vhd_header_t);
|
| 617 |
|
| 618 |
bat_bytes = vhd_bytes_padded(ctx->header.max_bat_size * sizeof(uint32_t));
|
| 619 |
bat_end = ctx->header.table_offset + bat_bytes; |
| 620 |
|
| 621 |
eom = MAX(eom, bat_end); |
| 622 |
|
| 623 |
if (vhd_has_batmap(ctx)) {
|
| 624 |
off64_t hdr_end, hdr_secs, map_end, map_secs; |
| 625 |
|
| 626 |
err = vhd_get_batmap(ctx); |
| 627 |
if (err)
|
| 628 |
return err;
|
| 629 |
|
| 630 |
hdr_secs = secs_round_up_no_zero(sizeof(vhd_batmap_header_t));
|
| 631 |
err = vhd_batmap_header_offset(ctx, &hdr_end); |
| 632 |
if (err)
|
| 633 |
return err;
|
| 634 |
|
| 635 |
hdr_end += vhd_sectors_to_bytes(hdr_secs); |
| 636 |
eom = MAX(eom, hdr_end); |
| 637 |
|
| 638 |
map_secs = ctx->batmap.header.batmap_size; |
| 639 |
map_end = (ctx->batmap.header.batmap_offset + |
| 640 |
vhd_sectors_to_bytes(map_secs)); |
| 641 |
eom = MAX(eom, map_end); |
| 642 |
} |
| 643 |
|
| 644 |
/* parent locators */
|
| 645 |
n = sizeof(ctx->header.loc) / sizeof(vhd_parent_locator_t); |
| 646 |
|
| 647 |
for (i = 0; i < n; i++) { |
| 648 |
off64_t loc_end; |
| 649 |
|
| 650 |
loc = &ctx->header.loc[i]; |
| 651 |
if (loc->code == PLAT_CODE_NONE)
|
| 652 |
continue;
|
| 653 |
|
| 654 |
loc_end = loc->data_offset + vhd_parent_locator_size(loc); |
| 655 |
eom = MAX(eom, loc_end); |
| 656 |
} |
| 657 |
|
| 658 |
*end = eom; |
| 659 |
return 0; |
| 660 |
} |
| 661 |
|
| 662 |
int
|
| 663 |
vhd_end_of_data(vhd_context_t *ctx, off64_t *end) |
| 664 |
{
|
| 665 |
int i, err;
|
| 666 |
off64_t max; |
| 667 |
uint64_t blk; |
| 668 |
|
| 669 |
if (!vhd_type_dynamic(ctx)) {
|
| 670 |
err = vhd_seek(ctx, 0, SEEK_END);
|
| 671 |
if (err)
|
| 672 |
return err;
|
| 673 |
|
| 674 |
max = vhd_position(ctx); |
| 675 |
if (max == (off64_t)-1) |
| 676 |
return -errno;
|
| 677 |
|
| 678 |
*end = max - sizeof(vhd_footer_t);
|
| 679 |
return 0; |
| 680 |
} |
| 681 |
|
| 682 |
err = vhd_end_of_headers(ctx, &max); |
| 683 |
if (err)
|
| 684 |
return err;
|
| 685 |
|
| 686 |
err = vhd_get_bat(ctx); |
| 687 |
if (err)
|
| 688 |
return err;
|
| 689 |
|
| 690 |
max >>= VHD_SECTOR_SHIFT; |
| 691 |
|
| 692 |
for (i = 0; i < ctx->bat.entries; i++) { |
| 693 |
blk = ctx->bat.bat[i]; |
| 694 |
|
| 695 |
if (blk != DD_BLK_UNUSED) {
|
| 696 |
blk += ctx->spb + ctx->bm_secs; |
| 697 |
max = MAX(blk, max); |
| 698 |
} |
| 699 |
} |
| 700 |
|
| 701 |
*end = vhd_sectors_to_bytes(max); |
| 702 |
return 0; |
| 703 |
} |
| 704 |
|
| 705 |
uint32_t |
| 706 |
vhd_time(time_t time) |
| 707 |
{
|
| 708 |
struct tm tm;
|
| 709 |
time_t micro_epoch; |
| 710 |
|
| 711 |
memset(&tm, 0, sizeof(struct tm)); |
| 712 |
tm.tm_year = 100;
|
| 713 |
tm.tm_mon = 0;
|
| 714 |
tm.tm_mday = 1;
|
| 715 |
micro_epoch = mktime(&tm); |
| 716 |
|
| 717 |
return (uint32_t)(time - micro_epoch);
|
| 718 |
} |
| 719 |
|
| 720 |
/*
|
| 721 |
* Stringify the VHD timestamp for printing.
|
| 722 |
* As with ctime_r, target must be >=26 bytes.
|
| 723 |
*/
|
| 724 |
size_t |
| 725 |
vhd_time_to_string(uint32_t timestamp, char *target)
|
| 726 |
{
|
| 727 |
char *cr;
|
| 728 |
struct tm tm;
|
| 729 |
time_t t1, t2; |
| 730 |
|
| 731 |
memset(&tm, 0, sizeof(struct tm)); |
| 732 |
|
| 733 |
/* VHD uses an epoch of 12:00AM, Jan 1, 2000. */
|
| 734 |
/* Need to adjust this to the expected epoch of 1970. */
|
| 735 |
tm.tm_year = 100;
|
| 736 |
tm.tm_mon = 0;
|
| 737 |
tm.tm_mday = 1;
|
| 738 |
|
| 739 |
t1 = mktime(&tm); |
| 740 |
t2 = t1 + (time_t)timestamp; |
| 741 |
ctime_r(&t2, target); |
| 742 |
|
| 743 |
/* handle mad ctime_r newline appending. */
|
| 744 |
if ((cr = strchr(target, '\n')) != NULL) |
| 745 |
*cr = '\0';
|
| 746 |
|
| 747 |
return (strlen(target));
|
| 748 |
} |
| 749 |
|
| 750 |
/*
|
| 751 |
* nabbed from vhd specs.
|
| 752 |
*/
|
| 753 |
uint32_t |
| 754 |
vhd_chs(uint64_t size) |
| 755 |
{
|
| 756 |
uint32_t secs, cylinders, heads, spt, cth; |
| 757 |
|
| 758 |
secs = secs_round_up_no_zero(size); |
| 759 |
|
| 760 |
if (secs > 65535 * 16 * 255) |
| 761 |
secs = 65535 * 16 * 255; |
| 762 |
|
| 763 |
if (secs >= 65535 * 16 * 63) { |
| 764 |
spt = 255;
|
| 765 |
cth = secs / spt; |
| 766 |
heads = 16;
|
| 767 |
} else {
|
| 768 |
spt = 17;
|
| 769 |
cth = secs / spt; |
| 770 |
heads = (cth + 1023) / 1024; |
| 771 |
|
| 772 |
if (heads < 4) |
| 773 |
heads = 4;
|
| 774 |
|
| 775 |
if (cth >= (heads * 1024) || heads > 16) { |
| 776 |
spt = 31;
|
| 777 |
cth = secs / spt; |
| 778 |
heads = 16;
|
| 779 |
} |
| 780 |
|
| 781 |
if (cth >= heads * 1024) { |
| 782 |
spt = 63;
|
| 783 |
cth = secs / spt; |
| 784 |
heads = 16;
|
| 785 |
} |
| 786 |
} |
| 787 |
|
| 788 |
cylinders = cth / heads; |
| 789 |
|
| 790 |
return GEOM_ENCODE(cylinders, heads, spt);
|
| 791 |
} |
| 792 |
|
| 793 |
int
|
| 794 |
vhd_get_footer(vhd_context_t *ctx) |
| 795 |
{
|
| 796 |
if (!vhd_validate_footer(&ctx->footer))
|
| 797 |
return 0; |
| 798 |
|
| 799 |
return vhd_read_footer(ctx, &ctx->footer);
|
| 800 |
} |
| 801 |
|
| 802 |
int
|
| 803 |
vhd_get_header(vhd_context_t *ctx) |
| 804 |
{
|
| 805 |
if (!vhd_type_dynamic(ctx))
|
| 806 |
return -EINVAL;
|
| 807 |
|
| 808 |
if (!vhd_validate_header(&ctx->header))
|
| 809 |
return 0; |
| 810 |
|
| 811 |
return vhd_read_header(ctx, &ctx->header);
|
| 812 |
} |
| 813 |
|
| 814 |
int
|
| 815 |
vhd_get_bat(vhd_context_t *ctx) |
| 816 |
{
|
| 817 |
if (!vhd_type_dynamic(ctx))
|
| 818 |
return -EINVAL;
|
| 819 |
|
| 820 |
if (!vhd_validate_bat(&ctx->bat))
|
| 821 |
return 0; |
| 822 |
|
| 823 |
vhd_put_bat(ctx); |
| 824 |
return vhd_read_bat(ctx, &ctx->bat);
|
| 825 |
} |
| 826 |
|
| 827 |
int
|
| 828 |
vhd_get_batmap(vhd_context_t *ctx) |
| 829 |
{
|
| 830 |
if (!vhd_has_batmap(ctx))
|
| 831 |
return -EINVAL;
|
| 832 |
|
| 833 |
if (!vhd_validate_batmap(ctx, &ctx->batmap))
|
| 834 |
return 0; |
| 835 |
|
| 836 |
vhd_put_batmap(ctx); |
| 837 |
return vhd_read_batmap(ctx, &ctx->batmap);
|
| 838 |
} |
| 839 |
|
| 840 |
void
|
| 841 |
vhd_put_footer(vhd_context_t *ctx) |
| 842 |
{
|
| 843 |
memset(&ctx->footer, 0, sizeof(vhd_footer_t)); |
| 844 |
} |
| 845 |
|
| 846 |
void
|
| 847 |
vhd_put_header(vhd_context_t *ctx) |
| 848 |
{
|
| 849 |
memset(&ctx->header, 0, sizeof(vhd_header_t)); |
| 850 |
} |
| 851 |
|
| 852 |
void
|
| 853 |
vhd_put_bat(vhd_context_t *ctx) |
| 854 |
{
|
| 855 |
if (!vhd_type_dynamic(ctx))
|
| 856 |
return;
|
| 857 |
|
| 858 |
free(ctx->bat.bat); |
| 859 |
memset(&ctx->bat, 0, sizeof(vhd_bat_t)); |
| 860 |
} |
| 861 |
|
| 862 |
void
|
| 863 |
vhd_put_batmap(vhd_context_t *ctx) |
| 864 |
{
|
| 865 |
if (!vhd_type_dynamic(ctx))
|
| 866 |
return;
|
| 867 |
|
| 868 |
if (!vhd_has_batmap(ctx))
|
| 869 |
return;
|
| 870 |
|
| 871 |
free(ctx->batmap.map); |
| 872 |
memset(&ctx->batmap, 0, sizeof(vhd_batmap_t)); |
| 873 |
} |
| 874 |
|
| 875 |
/*
|
| 876 |
* look for 511 byte footer at end of file
|
| 877 |
*/
|
| 878 |
int
|
| 879 |
vhd_read_short_footer(vhd_context_t *ctx, vhd_footer_t *footer) |
| 880 |
{
|
| 881 |
off64_t eof; |
| 882 |
void *buf;
|
| 883 |
int err;
|
| 884 |
|
| 885 |
buf = NULL;
|
| 886 |
|
| 887 |
err = vhd_seek(ctx, 0, SEEK_END);
|
| 888 |
if (err)
|
| 889 |
goto out;
|
| 890 |
|
| 891 |
eof = vhd_position(ctx); |
| 892 |
if (eof == (off64_t)-1) { |
| 893 |
err = -errno; |
| 894 |
goto out;
|
| 895 |
} |
| 896 |
|
| 897 |
err = vhd_seek(ctx, eof - 511, SEEK_SET);
|
| 898 |
if (err)
|
| 899 |
goto out;
|
| 900 |
|
| 901 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, sizeof(vhd_footer_t));
|
| 902 |
if (err) {
|
| 903 |
buf = NULL;
|
| 904 |
err = -err; |
| 905 |
goto out;
|
| 906 |
} |
| 907 |
|
| 908 |
memset(buf, 0, sizeof(vhd_footer_t)); |
| 909 |
|
| 910 |
/*
|
| 911 |
* expecting short read here
|
| 912 |
*/
|
| 913 |
vhd_read(ctx, buf, sizeof(vhd_footer_t));
|
| 914 |
|
| 915 |
memcpy(footer, buf, sizeof(vhd_footer_t));
|
| 916 |
|
| 917 |
vhd_footer_in(footer); |
| 918 |
err = vhd_validate_footer(footer); |
| 919 |
|
| 920 |
out:
|
| 921 |
if (err)
|
| 922 |
VHDLOG("%s: failed reading short footer: %d\n",
|
| 923 |
ctx->file, err); |
| 924 |
free(buf); |
| 925 |
return err;
|
| 926 |
} |
| 927 |
|
| 928 |
int
|
| 929 |
vhd_read_footer_at(vhd_context_t *ctx, vhd_footer_t *footer, off64_t off) |
| 930 |
{
|
| 931 |
void *buf;
|
| 932 |
int err;
|
| 933 |
|
| 934 |
buf = NULL;
|
| 935 |
|
| 936 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 937 |
if (err)
|
| 938 |
goto out;
|
| 939 |
|
| 940 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, sizeof(vhd_footer_t));
|
| 941 |
if (err) {
|
| 942 |
buf = NULL;
|
| 943 |
err = -err; |
| 944 |
goto out;
|
| 945 |
} |
| 946 |
|
| 947 |
err = vhd_read(ctx, buf, sizeof(vhd_footer_t));
|
| 948 |
if (err)
|
| 949 |
goto out;
|
| 950 |
|
| 951 |
memcpy(footer, buf, sizeof(vhd_footer_t));
|
| 952 |
|
| 953 |
vhd_footer_in(footer); |
| 954 |
err = vhd_validate_footer(footer); |
| 955 |
|
| 956 |
out:
|
| 957 |
if (err)
|
| 958 |
VHDLOG("%s: reading footer at 0x%08"PRIx64" failed: %d\n", |
| 959 |
ctx->file, off, err); |
| 960 |
free(buf); |
| 961 |
return err;
|
| 962 |
} |
| 963 |
|
| 964 |
int
|
| 965 |
vhd_read_footer(vhd_context_t *ctx, vhd_footer_t *footer) |
| 966 |
{
|
| 967 |
int err;
|
| 968 |
off64_t off; |
| 969 |
|
| 970 |
err = vhd_seek(ctx, 0, SEEK_END);
|
| 971 |
if (err)
|
| 972 |
return err;
|
| 973 |
|
| 974 |
off = vhd_position(ctx); |
| 975 |
if (off == (off64_t)-1) |
| 976 |
return -errno;
|
| 977 |
|
| 978 |
err = vhd_read_footer_at(ctx, footer, off - 512);
|
| 979 |
if (err != -EINVAL)
|
| 980 |
return err;
|
| 981 |
|
| 982 |
err = vhd_read_short_footer(ctx, footer); |
| 983 |
if (err != -EINVAL)
|
| 984 |
return err;
|
| 985 |
|
| 986 |
/*
|
| 987 |
* Disable the enforcement of VHD_OPEN_STRICT until we figure out how
|
| 988 |
* to recover from crashes. Note that we never enforced it before
|
| 989 |
* anyways due to a bug (CA-28285) and everything was ok.
|
| 990 |
*/
|
| 991 |
/* if (ctx->oflags & VHD_OPEN_STRICT)
|
| 992 |
return -EINVAL; */
|
| 993 |
|
| 994 |
return vhd_read_footer_at(ctx, footer, 0); |
| 995 |
} |
| 996 |
|
| 997 |
int
|
| 998 |
vhd_read_header_at(vhd_context_t *ctx, vhd_header_t *header, off64_t off) |
| 999 |
{
|
| 1000 |
void *buf;
|
| 1001 |
int err;
|
| 1002 |
|
| 1003 |
buf = NULL;
|
| 1004 |
|
| 1005 |
if (!vhd_type_dynamic(ctx)) {
|
| 1006 |
err = -EINVAL; |
| 1007 |
goto out;
|
| 1008 |
} |
| 1009 |
|
| 1010 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1011 |
if (err)
|
| 1012 |
goto out;
|
| 1013 |
|
| 1014 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, sizeof(vhd_header_t));
|
| 1015 |
if (err) {
|
| 1016 |
buf = NULL;
|
| 1017 |
err = -err; |
| 1018 |
goto out;
|
| 1019 |
} |
| 1020 |
|
| 1021 |
err = vhd_read(ctx, buf, sizeof(vhd_header_t));
|
| 1022 |
if (err)
|
| 1023 |
goto out;
|
| 1024 |
|
| 1025 |
memcpy(header, buf, sizeof(vhd_header_t));
|
| 1026 |
|
| 1027 |
vhd_header_in(header); |
| 1028 |
err = vhd_validate_header(header); |
| 1029 |
|
| 1030 |
out:
|
| 1031 |
if (err)
|
| 1032 |
VHDLOG("%s: reading header at 0x%08"PRIx64" failed: %d\n", |
| 1033 |
ctx->file, off, err); |
| 1034 |
free(buf); |
| 1035 |
return err;
|
| 1036 |
} |
| 1037 |
|
| 1038 |
int
|
| 1039 |
vhd_read_header(vhd_context_t *ctx, vhd_header_t *header) |
| 1040 |
{
|
| 1041 |
off64_t off; |
| 1042 |
|
| 1043 |
if (!vhd_type_dynamic(ctx)) {
|
| 1044 |
VHDLOG("%s is not dynamic!\n", ctx->file);
|
| 1045 |
return -EINVAL;
|
| 1046 |
} |
| 1047 |
|
| 1048 |
off = ctx->footer.data_offset; |
| 1049 |
return vhd_read_header_at(ctx, header, off);
|
| 1050 |
} |
| 1051 |
|
| 1052 |
int
|
| 1053 |
vhd_read_bat(vhd_context_t *ctx, vhd_bat_t *bat) |
| 1054 |
{
|
| 1055 |
int err;
|
| 1056 |
void *buf;
|
| 1057 |
off64_t off; |
| 1058 |
uint32_t vhd_blks; |
| 1059 |
size_t size; |
| 1060 |
|
| 1061 |
buf = NULL;
|
| 1062 |
|
| 1063 |
if (!vhd_type_dynamic(ctx)) {
|
| 1064 |
err = -EINVAL; |
| 1065 |
goto fail;
|
| 1066 |
} |
| 1067 |
|
| 1068 |
off = ctx->header.table_offset; |
| 1069 |
/* The BAT size is stored in ctx->header.max_bat_size. However, we
|
| 1070 |
* sometimes preallocate BAT + batmap for max VHD size, so only read in
|
| 1071 |
* the BAT entries that are in use for curr_size */
|
| 1072 |
vhd_blks = ctx->footer.curr_size >> VHD_BLOCK_SHIFT; |
| 1073 |
ASSERT(ctx->header.max_bat_size >= vhd_blks); |
| 1074 |
size = vhd_bytes_padded(vhd_blks * sizeof(uint32_t));
|
| 1075 |
|
| 1076 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 1077 |
if (err) {
|
| 1078 |
buf = NULL;
|
| 1079 |
err = -err; |
| 1080 |
goto fail;
|
| 1081 |
} |
| 1082 |
|
| 1083 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1084 |
if (err)
|
| 1085 |
goto fail;
|
| 1086 |
|
| 1087 |
err = vhd_read(ctx, buf, size); |
| 1088 |
if (err)
|
| 1089 |
goto fail;
|
| 1090 |
|
| 1091 |
bat->spb = ctx->header.block_size >> VHD_SECTOR_SHIFT; |
| 1092 |
bat->entries = vhd_blks; |
| 1093 |
bat->bat = (uint32_t *)buf; |
| 1094 |
|
| 1095 |
vhd_bat_in(bat); |
| 1096 |
|
| 1097 |
return 0; |
| 1098 |
|
| 1099 |
fail:
|
| 1100 |
free(buf); |
| 1101 |
memset(bat, 0, sizeof(vhd_bat_t)); |
| 1102 |
VHDLOG("%s: failed to read bat: %d\n", ctx->file, err);
|
| 1103 |
return err;
|
| 1104 |
} |
| 1105 |
|
| 1106 |
static int |
| 1107 |
vhd_read_batmap_header(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 1108 |
{
|
| 1109 |
int err;
|
| 1110 |
void *buf;
|
| 1111 |
off64_t off; |
| 1112 |
size_t size; |
| 1113 |
|
| 1114 |
buf = NULL;
|
| 1115 |
|
| 1116 |
err = vhd_batmap_header_offset(ctx, &off); |
| 1117 |
if (err)
|
| 1118 |
goto fail;
|
| 1119 |
|
| 1120 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1121 |
if (err)
|
| 1122 |
goto fail;
|
| 1123 |
|
| 1124 |
size = vhd_bytes_padded(sizeof(vhd_batmap_header_t));
|
| 1125 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 1126 |
if (err) {
|
| 1127 |
buf = NULL;
|
| 1128 |
err = -err; |
| 1129 |
goto fail;
|
| 1130 |
} |
| 1131 |
|
| 1132 |
err = vhd_read(ctx, buf, size); |
| 1133 |
if (err)
|
| 1134 |
goto fail;
|
| 1135 |
|
| 1136 |
memcpy(&batmap->header, buf, sizeof(vhd_batmap_header_t));
|
| 1137 |
free(buf); |
| 1138 |
buf = NULL;
|
| 1139 |
|
| 1140 |
vhd_batmap_header_in(batmap); |
| 1141 |
|
| 1142 |
return 0; |
| 1143 |
|
| 1144 |
fail:
|
| 1145 |
free(buf); |
| 1146 |
memset(&batmap->header, 0, sizeof(vhd_batmap_header_t)); |
| 1147 |
VHDLOG("%s: failed to read batmap header: %d\n", ctx->file, err);
|
| 1148 |
return err;
|
| 1149 |
} |
| 1150 |
|
| 1151 |
static int |
| 1152 |
vhd_read_batmap_map(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 1153 |
{
|
| 1154 |
int err;
|
| 1155 |
void *buf;
|
| 1156 |
off64_t off; |
| 1157 |
size_t map_size; |
| 1158 |
|
| 1159 |
map_size = vhd_sectors_to_bytes(secs_round_up_no_zero( |
| 1160 |
ctx->footer.curr_size >> (VHD_BLOCK_SHIFT + 3)));
|
| 1161 |
ASSERT(vhd_sectors_to_bytes(batmap->header.batmap_size) >= map_size); |
| 1162 |
|
| 1163 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, map_size); |
| 1164 |
if (err) {
|
| 1165 |
buf = NULL;
|
| 1166 |
err = -err; |
| 1167 |
goto fail;
|
| 1168 |
} |
| 1169 |
|
| 1170 |
off = batmap->header.batmap_offset; |
| 1171 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1172 |
if (err)
|
| 1173 |
goto fail;
|
| 1174 |
|
| 1175 |
err = vhd_read(ctx, buf, map_size); |
| 1176 |
if (err)
|
| 1177 |
goto fail;
|
| 1178 |
|
| 1179 |
batmap->map = buf; |
| 1180 |
return 0; |
| 1181 |
|
| 1182 |
fail:
|
| 1183 |
free(buf); |
| 1184 |
batmap->map = NULL;
|
| 1185 |
VHDLOG("%s: failed to read batmap: %d\n", ctx->file, err);
|
| 1186 |
return err;
|
| 1187 |
} |
| 1188 |
|
| 1189 |
int
|
| 1190 |
vhd_read_batmap(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 1191 |
{
|
| 1192 |
int err;
|
| 1193 |
|
| 1194 |
if (!vhd_has_batmap(ctx))
|
| 1195 |
return -EINVAL;
|
| 1196 |
|
| 1197 |
memset(batmap, 0, sizeof(vhd_batmap_t)); |
| 1198 |
|
| 1199 |
err = vhd_read_batmap_header(ctx, batmap); |
| 1200 |
if (err)
|
| 1201 |
return err;
|
| 1202 |
|
| 1203 |
err = vhd_validate_batmap_header(batmap); |
| 1204 |
if (err)
|
| 1205 |
return err;
|
| 1206 |
|
| 1207 |
err = vhd_read_batmap_map(ctx, batmap); |
| 1208 |
if (err)
|
| 1209 |
return err;
|
| 1210 |
|
| 1211 |
err = vhd_validate_batmap(ctx, batmap); |
| 1212 |
if (err)
|
| 1213 |
goto fail;
|
| 1214 |
|
| 1215 |
return 0; |
| 1216 |
|
| 1217 |
fail:
|
| 1218 |
free(batmap->map); |
| 1219 |
memset(batmap, 0, sizeof(vhd_batmap_t)); |
| 1220 |
return err;
|
| 1221 |
} |
| 1222 |
|
| 1223 |
int
|
| 1224 |
vhd_has_batmap(vhd_context_t *ctx) |
| 1225 |
{
|
| 1226 |
if (!vhd_type_dynamic(ctx))
|
| 1227 |
return 0; |
| 1228 |
|
| 1229 |
if (!vhd_creator_tapdisk(ctx))
|
| 1230 |
return 0; |
| 1231 |
|
| 1232 |
if (ctx->footer.crtr_ver <= VHD_VERSION(0, 1)) |
| 1233 |
return 0; |
| 1234 |
|
| 1235 |
if (ctx->footer.crtr_ver >= VHD_VERSION(1, 2)) |
| 1236 |
return 1; |
| 1237 |
|
| 1238 |
/*
|
| 1239 |
* VHDs of version 1.1 probably have a batmap, but may not
|
| 1240 |
* if they were updated from version 0.1 via vhd-update.
|
| 1241 |
*/
|
| 1242 |
if (!vhd_validate_batmap_header(&ctx->batmap))
|
| 1243 |
return 1; |
| 1244 |
|
| 1245 |
if (vhd_read_batmap_header(ctx, &ctx->batmap))
|
| 1246 |
return 0; |
| 1247 |
|
| 1248 |
return (!vhd_validate_batmap_header(&ctx->batmap));
|
| 1249 |
} |
| 1250 |
|
| 1251 |
/*
|
| 1252 |
* Is this a block device (with a fixed size)? This affects whether the file
|
| 1253 |
* can be truncated and where the footer is written for VHDs.
|
| 1254 |
*/
|
| 1255 |
int
|
| 1256 |
vhd_test_file_fixed(const char *file, int *is_block) |
| 1257 |
{
|
| 1258 |
int err;
|
| 1259 |
struct stat stats;
|
| 1260 |
|
| 1261 |
err = stat(file, &stats); |
| 1262 |
if (err == -1) |
| 1263 |
return -errno;
|
| 1264 |
|
| 1265 |
*is_block = !!(S_ISBLK(stats.st_mode)); |
| 1266 |
return err;
|
| 1267 |
} |
| 1268 |
|
| 1269 |
int
|
| 1270 |
vhd_find_parent(vhd_context_t *ctx, const char *parent, char **_location) |
| 1271 |
{
|
| 1272 |
char *location, __location[PATH_MAX];
|
| 1273 |
char *cpath, __cpath[PATH_MAX];
|
| 1274 |
char *cdir, *path;
|
| 1275 |
int err;
|
| 1276 |
|
| 1277 |
err = 0;
|
| 1278 |
path = NULL;
|
| 1279 |
cpath = NULL;
|
| 1280 |
location = NULL;
|
| 1281 |
*_location = NULL;
|
| 1282 |
|
| 1283 |
if (!parent)
|
| 1284 |
return -EINVAL;
|
| 1285 |
|
| 1286 |
if (parent[0] == '/') { |
| 1287 |
if (!access(parent, R_OK)) {
|
| 1288 |
*_location = strdup(parent); |
| 1289 |
if (!*_location)
|
| 1290 |
return -errno;
|
| 1291 |
return 0; |
| 1292 |
} |
| 1293 |
} |
| 1294 |
|
| 1295 |
/* check parent path relative to child's directory */
|
| 1296 |
cpath = realpath(ctx->file, __cpath); |
| 1297 |
if (!cpath) {
|
| 1298 |
err = -errno; |
| 1299 |
goto out;
|
| 1300 |
} |
| 1301 |
|
| 1302 |
cdir = dirname(cpath); |
| 1303 |
if (asprintf(&location, "%s/%s", cdir, parent) == -1) { |
| 1304 |
err = -errno; |
| 1305 |
location = NULL;
|
| 1306 |
goto out;
|
| 1307 |
} |
| 1308 |
|
| 1309 |
if (!access(location, R_OK)) {
|
| 1310 |
path = realpath(location, __location); |
| 1311 |
if (path) {
|
| 1312 |
*_location = strdup(path); |
| 1313 |
if (!*_location)
|
| 1314 |
return -errno;
|
| 1315 |
return 0; |
| 1316 |
} |
| 1317 |
} |
| 1318 |
|
| 1319 |
out:
|
| 1320 |
return err;
|
| 1321 |
} |
| 1322 |
|
| 1323 |
int
|
| 1324 |
vhd_macx_encode_location(char *name, char **out, int *outlen) |
| 1325 |
{
|
| 1326 |
iconv_t cd; |
| 1327 |
int len, err;
|
| 1328 |
size_t ibl, obl; |
| 1329 |
char *uri, *urip, *uri_utf8, *uri_utf8p, *ret;
|
| 1330 |
|
| 1331 |
err = 0;
|
| 1332 |
ret = NULL;
|
| 1333 |
*out = NULL;
|
| 1334 |
*outlen = 0;
|
| 1335 |
len = strlen(name) + strlen("file://");
|
| 1336 |
|
| 1337 |
ibl = len; |
| 1338 |
obl = len; |
| 1339 |
|
| 1340 |
uri = urip = malloc(ibl + 1);
|
| 1341 |
uri_utf8 = uri_utf8p = malloc(obl); |
| 1342 |
|
| 1343 |
if (!uri || !uri_utf8)
|
| 1344 |
return -ENOMEM;
|
| 1345 |
|
| 1346 |
cd = iconv_open("UTF-8", "ASCII"); |
| 1347 |
if (cd == (iconv_t)-1) { |
| 1348 |
err = -errno; |
| 1349 |
goto out;
|
| 1350 |
} |
| 1351 |
|
| 1352 |
sprintf(uri, "file://%s", name);
|
| 1353 |
|
| 1354 |
if (iconv(cd, &urip, &ibl, &uri_utf8p, &obl) == (size_t)-1 || |
| 1355 |
ibl || obl) {
|
| 1356 |
err = (errno ? -errno : -EIO); |
| 1357 |
goto out;
|
| 1358 |
} |
| 1359 |
|
| 1360 |
ret = malloc(len); |
| 1361 |
if (!ret) {
|
| 1362 |
err = -ENOMEM; |
| 1363 |
goto out;
|
| 1364 |
} |
| 1365 |
|
| 1366 |
memcpy(ret, uri_utf8, len); |
| 1367 |
*outlen = len; |
| 1368 |
*out = ret; |
| 1369 |
|
| 1370 |
out:
|
| 1371 |
free(uri); |
| 1372 |
free(uri_utf8); |
| 1373 |
if (cd != (iconv_t)-1) |
| 1374 |
iconv_close(cd); |
| 1375 |
|
| 1376 |
return err;
|
| 1377 |
} |
| 1378 |
|
| 1379 |
int
|
| 1380 |
vhd_w2u_encode_location(char *name, char **out, int *outlen) |
| 1381 |
{
|
| 1382 |
iconv_t cd; |
| 1383 |
int len, err;
|
| 1384 |
size_t ibl, obl; |
| 1385 |
char *uri, *urip, *uri_utf16, *uri_utf16p, *tmp, *ret;
|
| 1386 |
|
| 1387 |
err = 0;
|
| 1388 |
ret = NULL;
|
| 1389 |
*out = NULL;
|
| 1390 |
*outlen = 0;
|
| 1391 |
cd = (iconv_t) -1;
|
| 1392 |
|
| 1393 |
/*
|
| 1394 |
* MICROSOFT_COMPAT
|
| 1395 |
* relative paths must start with ".\"
|
| 1396 |
*/
|
| 1397 |
if (name[0] != '/') { |
| 1398 |
tmp = strstr(name, "./");
|
| 1399 |
if (tmp == name)
|
| 1400 |
tmp += strlen("./");
|
| 1401 |
else
|
| 1402 |
tmp = name; |
| 1403 |
|
| 1404 |
err = asprintf(&uri, ".\\%s", tmp);
|
| 1405 |
} else
|
| 1406 |
err = asprintf(&uri, "%s", name);
|
| 1407 |
|
| 1408 |
if (err == -1) |
| 1409 |
return -ENOMEM;
|
| 1410 |
|
| 1411 |
tmp = uri; |
| 1412 |
while (*tmp != '\0') { |
| 1413 |
if (*tmp == '/') |
| 1414 |
*tmp = '\\';
|
| 1415 |
tmp++; |
| 1416 |
} |
| 1417 |
|
| 1418 |
len = strlen(uri); |
| 1419 |
ibl = len; |
| 1420 |
obl = len * 2;
|
| 1421 |
urip = uri; |
| 1422 |
|
| 1423 |
uri_utf16 = uri_utf16p = malloc(obl); |
| 1424 |
if (!uri_utf16) {
|
| 1425 |
err = -ENOMEM; |
| 1426 |
goto out;
|
| 1427 |
} |
| 1428 |
|
| 1429 |
/*
|
| 1430 |
* MICROSOFT_COMPAT
|
| 1431 |
* little endian unicode here
|
| 1432 |
*/
|
| 1433 |
cd = iconv_open("UTF-16LE", "ASCII"); |
| 1434 |
if (cd == (iconv_t)-1) { |
| 1435 |
err = -errno; |
| 1436 |
goto out;
|
| 1437 |
} |
| 1438 |
|
| 1439 |
if (iconv(cd, &urip, &ibl, &uri_utf16p, &obl) == (size_t)-1 || |
| 1440 |
ibl || obl) {
|
| 1441 |
err = (errno ? -errno : -EIO); |
| 1442 |
goto out;
|
| 1443 |
} |
| 1444 |
|
| 1445 |
len = len * 2;
|
| 1446 |
ret = malloc(len); |
| 1447 |
if (!ret) {
|
| 1448 |
err = -ENOMEM; |
| 1449 |
goto out;
|
| 1450 |
} |
| 1451 |
|
| 1452 |
memcpy(ret, uri_utf16, len); |
| 1453 |
*outlen = len; |
| 1454 |
*out = ret; |
| 1455 |
err = 0;
|
| 1456 |
|
| 1457 |
out:
|
| 1458 |
free(uri); |
| 1459 |
free(uri_utf16); |
| 1460 |
if (cd != (iconv_t)-1) |
| 1461 |
iconv_close(cd); |
| 1462 |
|
| 1463 |
return err;
|
| 1464 |
} |
| 1465 |
|
| 1466 |
static char * |
| 1467 |
vhd_macx_decode_location(char *in, char *out, int len) |
| 1468 |
{
|
| 1469 |
iconv_t cd; |
| 1470 |
char *name;
|
| 1471 |
size_t ibl, obl; |
| 1472 |
|
| 1473 |
name = out; |
| 1474 |
ibl = obl = len; |
| 1475 |
|
| 1476 |
cd = iconv_open("ASCII", "UTF-8"); |
| 1477 |
if (cd == (iconv_t)-1) |
| 1478 |
return NULL; |
| 1479 |
|
| 1480 |
if (iconv(cd, &in, &ibl, &out, &obl) == (size_t)-1 || ibl) |
| 1481 |
return NULL; |
| 1482 |
|
| 1483 |
iconv_close(cd); |
| 1484 |
*out = '\0';
|
| 1485 |
|
| 1486 |
if (strstr(name, "file://") != name) |
| 1487 |
return NULL; |
| 1488 |
|
| 1489 |
name += strlen("file://");
|
| 1490 |
|
| 1491 |
return strdup(name);
|
| 1492 |
} |
| 1493 |
|
| 1494 |
static char * |
| 1495 |
vhd_w2u_decode_location(char *in, char *out, int len, char *utf_type) |
| 1496 |
{
|
| 1497 |
iconv_t cd; |
| 1498 |
char *name, *tmp;
|
| 1499 |
size_t ibl, obl; |
| 1500 |
|
| 1501 |
tmp = name = out; |
| 1502 |
ibl = obl = len; |
| 1503 |
|
| 1504 |
cd = iconv_open("ASCII", utf_type);
|
| 1505 |
if (cd == (iconv_t)-1) |
| 1506 |
return NULL; |
| 1507 |
|
| 1508 |
if (iconv(cd, &in, &ibl, &out, &obl) == (size_t)-1 || ibl) |
| 1509 |
return NULL; |
| 1510 |
|
| 1511 |
iconv_close(cd); |
| 1512 |
*out = '\0';
|
| 1513 |
|
| 1514 |
/* TODO: spaces */
|
| 1515 |
while (tmp != out) {
|
| 1516 |
if (*tmp == '\\') |
| 1517 |
*tmp = '/';
|
| 1518 |
tmp++; |
| 1519 |
} |
| 1520 |
|
| 1521 |
if (strstr(name, "C:") == name || strstr(name, "c:") == name) |
| 1522 |
name += strlen("c:");
|
| 1523 |
|
| 1524 |
return strdup(name);
|
| 1525 |
} |
| 1526 |
|
| 1527 |
int
|
| 1528 |
vhd_header_decode_parent(vhd_context_t *ctx, vhd_header_t *header, char **buf)
|
| 1529 |
{
|
| 1530 |
char *code, out[512]; |
| 1531 |
|
| 1532 |
if (vhd_creator_tapdisk(ctx) &&
|
| 1533 |
ctx->footer.crtr_ver == VHD_VERSION(0, 1)) |
| 1534 |
code = UTF_16; |
| 1535 |
else
|
| 1536 |
code = UTF_16BE; |
| 1537 |
|
| 1538 |
*buf = vhd_w2u_decode_location(header->prt_name, out, 512, code);
|
| 1539 |
return (*buf == NULL ? -EINVAL : 0); |
| 1540 |
} |
| 1541 |
|
| 1542 |
int
|
| 1543 |
vhd_parent_locator_read(vhd_context_t *ctx, |
| 1544 |
vhd_parent_locator_t *loc, char **parent)
|
| 1545 |
{
|
| 1546 |
int err, size;
|
| 1547 |
void *raw, *out, *name;
|
| 1548 |
|
| 1549 |
raw = NULL;
|
| 1550 |
out = NULL;
|
| 1551 |
name = NULL;
|
| 1552 |
*parent = NULL;
|
| 1553 |
|
| 1554 |
if (ctx->footer.type != HD_TYPE_DIFF) {
|
| 1555 |
err = -EINVAL; |
| 1556 |
goto out;
|
| 1557 |
} |
| 1558 |
|
| 1559 |
switch (loc->code) {
|
| 1560 |
case PLAT_CODE_MACX:
|
| 1561 |
case PLAT_CODE_W2KU:
|
| 1562 |
case PLAT_CODE_W2RU:
|
| 1563 |
break;
|
| 1564 |
default:
|
| 1565 |
err = -EINVAL; |
| 1566 |
goto out;
|
| 1567 |
} |
| 1568 |
|
| 1569 |
err = vhd_seek(ctx, loc->data_offset, SEEK_SET); |
| 1570 |
if (err)
|
| 1571 |
goto out;
|
| 1572 |
|
| 1573 |
size = vhd_parent_locator_size(loc); |
| 1574 |
if (size <= 0) { |
| 1575 |
err = -EINVAL; |
| 1576 |
goto out;
|
| 1577 |
} |
| 1578 |
|
| 1579 |
err = posix_memalign(&raw, VHD_SECTOR_SIZE, size); |
| 1580 |
if (err) {
|
| 1581 |
raw = NULL;
|
| 1582 |
err = -err; |
| 1583 |
goto out;
|
| 1584 |
} |
| 1585 |
|
| 1586 |
err = vhd_read(ctx, raw, size); |
| 1587 |
if (err)
|
| 1588 |
goto out;
|
| 1589 |
|
| 1590 |
out = malloc(loc->data_len + 1);
|
| 1591 |
if (!out) {
|
| 1592 |
err = -ENOMEM; |
| 1593 |
goto out;
|
| 1594 |
} |
| 1595 |
|
| 1596 |
switch (loc->code) {
|
| 1597 |
case PLAT_CODE_MACX:
|
| 1598 |
name = vhd_macx_decode_location(raw, out, loc->data_len); |
| 1599 |
break;
|
| 1600 |
case PLAT_CODE_W2KU:
|
| 1601 |
case PLAT_CODE_W2RU:
|
| 1602 |
name = vhd_w2u_decode_location(raw, out, |
| 1603 |
loc->data_len, UTF_16LE); |
| 1604 |
break;
|
| 1605 |
} |
| 1606 |
|
| 1607 |
if (!name) {
|
| 1608 |
err = -EINVAL; |
| 1609 |
goto out;
|
| 1610 |
} |
| 1611 |
|
| 1612 |
err = 0;
|
| 1613 |
*parent = name; |
| 1614 |
|
| 1615 |
out:
|
| 1616 |
free(raw); |
| 1617 |
free(out); |
| 1618 |
|
| 1619 |
if (err) {
|
| 1620 |
VHDLOG("%s: error reading parent locator: %d\n",
|
| 1621 |
ctx->file, err); |
| 1622 |
VHDLOG("%s: locator: code %u, space 0x%x, len 0x%x, "
|
| 1623 |
"off 0x%"PRIx64"\n", ctx->file, loc->code, loc->data_space, |
| 1624 |
loc->data_len, loc->data_offset); |
| 1625 |
} |
| 1626 |
|
| 1627 |
return err;
|
| 1628 |
} |
| 1629 |
|
| 1630 |
int
|
| 1631 |
vhd_parent_locator_get(vhd_context_t *ctx, char **parent)
|
| 1632 |
{
|
| 1633 |
int i, n, err;
|
| 1634 |
char *name, *location;
|
| 1635 |
vhd_parent_locator_t *loc; |
| 1636 |
|
| 1637 |
err = -EINVAL; |
| 1638 |
*parent = NULL;
|
| 1639 |
|
| 1640 |
if (ctx->footer.type != HD_TYPE_DIFF)
|
| 1641 |
return -EINVAL;
|
| 1642 |
|
| 1643 |
n = vhd_parent_locator_count(ctx); |
| 1644 |
for (i = 0; i < n; i++) { |
| 1645 |
int _err;
|
| 1646 |
|
| 1647 |
loc = ctx->header.loc + i; |
| 1648 |
_err = vhd_parent_locator_read(ctx, loc, &name); |
| 1649 |
if (_err)
|
| 1650 |
continue;
|
| 1651 |
|
| 1652 |
err = vhd_find_parent(ctx, name, &location); |
| 1653 |
if (err)
|
| 1654 |
VHDLOG("%s: couldn't find parent %s (%d)\n",
|
| 1655 |
ctx->file, name, err); |
| 1656 |
free(name); |
| 1657 |
|
| 1658 |
if (!err) {
|
| 1659 |
*parent = location; |
| 1660 |
return 0; |
| 1661 |
} |
| 1662 |
} |
| 1663 |
|
| 1664 |
return err;
|
| 1665 |
} |
| 1666 |
|
| 1667 |
int
|
| 1668 |
vhd_parent_locator_write_at(vhd_context_t *ctx, |
| 1669 |
const char *parent, off64_t off, uint32_t code, |
| 1670 |
size_t max_bytes, vhd_parent_locator_t *loc) |
| 1671 |
{
|
| 1672 |
struct stat stats;
|
| 1673 |
int err, len, size;
|
| 1674 |
char *absolute_path, *relative_path, *encoded;
|
| 1675 |
char __parent[PATH_MAX];
|
| 1676 |
void *block;
|
| 1677 |
|
| 1678 |
memset(loc, 0, sizeof(vhd_parent_locator_t)); |
| 1679 |
|
| 1680 |
if (ctx->footer.type != HD_TYPE_DIFF)
|
| 1681 |
return -EINVAL;
|
| 1682 |
|
| 1683 |
absolute_path = NULL;
|
| 1684 |
relative_path = NULL;
|
| 1685 |
encoded = NULL;
|
| 1686 |
block = NULL;
|
| 1687 |
size = 0;
|
| 1688 |
len = 0;
|
| 1689 |
|
| 1690 |
switch (code) {
|
| 1691 |
case PLAT_CODE_MACX:
|
| 1692 |
case PLAT_CODE_W2KU:
|
| 1693 |
case PLAT_CODE_W2RU:
|
| 1694 |
break;
|
| 1695 |
default:
|
| 1696 |
return -EINVAL;
|
| 1697 |
} |
| 1698 |
|
| 1699 |
absolute_path = realpath(parent, __parent); |
| 1700 |
if (!absolute_path) {
|
| 1701 |
err = -errno; |
| 1702 |
goto out;
|
| 1703 |
} |
| 1704 |
|
| 1705 |
err = stat(absolute_path, &stats); |
| 1706 |
if (err) {
|
| 1707 |
err = -errno; |
| 1708 |
goto out;
|
| 1709 |
} |
| 1710 |
|
| 1711 |
if (!S_ISREG(stats.st_mode) && !S_ISBLK(stats.st_mode)) {
|
| 1712 |
err = -EINVAL; |
| 1713 |
goto out;
|
| 1714 |
} |
| 1715 |
|
| 1716 |
relative_path = relative_path_to(ctx->file, absolute_path, &err); |
| 1717 |
if (!relative_path || err) {
|
| 1718 |
err = (err ? err : -EINVAL); |
| 1719 |
goto out;
|
| 1720 |
} |
| 1721 |
|
| 1722 |
switch (code) {
|
| 1723 |
case PLAT_CODE_MACX:
|
| 1724 |
err = vhd_macx_encode_location(relative_path, &encoded, &len); |
| 1725 |
break;
|
| 1726 |
case PLAT_CODE_W2KU:
|
| 1727 |
case PLAT_CODE_W2RU:
|
| 1728 |
err = vhd_w2u_encode_location(relative_path, &encoded, &len); |
| 1729 |
break;
|
| 1730 |
default:
|
| 1731 |
err = -EINVAL; |
| 1732 |
} |
| 1733 |
|
| 1734 |
if (err)
|
| 1735 |
goto out;
|
| 1736 |
|
| 1737 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1738 |
if (err)
|
| 1739 |
goto out;
|
| 1740 |
|
| 1741 |
size = vhd_bytes_padded(len); |
| 1742 |
|
| 1743 |
if (max_bytes && size > max_bytes) {
|
| 1744 |
err = -ENAMETOOLONG; |
| 1745 |
goto out;
|
| 1746 |
} |
| 1747 |
|
| 1748 |
err = posix_memalign(&block, VHD_SECTOR_SIZE, size); |
| 1749 |
if (err) {
|
| 1750 |
block = NULL;
|
| 1751 |
err = -err; |
| 1752 |
goto out;
|
| 1753 |
} |
| 1754 |
|
| 1755 |
memset(block, 0, size);
|
| 1756 |
memcpy(block, encoded, len); |
| 1757 |
|
| 1758 |
err = vhd_write(ctx, block, size); |
| 1759 |
if (err)
|
| 1760 |
goto out;
|
| 1761 |
|
| 1762 |
err = 0;
|
| 1763 |
|
| 1764 |
out:
|
| 1765 |
free(relative_path); |
| 1766 |
free(encoded); |
| 1767 |
free(block); |
| 1768 |
|
| 1769 |
if (!err) {
|
| 1770 |
loc->res = 0;
|
| 1771 |
loc->code = code; |
| 1772 |
loc->data_len = len; |
| 1773 |
/*
|
| 1774 |
* write number of bytes ('size') instead of number of sectors
|
| 1775 |
* into loc->data_space to be compatible with MSFT, even though
|
| 1776 |
* this goes against the specs
|
| 1777 |
*/
|
| 1778 |
loc->data_space = size; |
| 1779 |
loc->data_offset = off; |
| 1780 |
} |
| 1781 |
|
| 1782 |
return err;
|
| 1783 |
} |
| 1784 |
|
| 1785 |
static int |
| 1786 |
vhd_footer_offset_at_eof(vhd_context_t *ctx, off64_t *off) |
| 1787 |
{
|
| 1788 |
int err;
|
| 1789 |
if ((err = vhd_seek(ctx, 0, SEEK_END))) |
| 1790 |
return errno;
|
| 1791 |
*off = vhd_position(ctx) - sizeof(vhd_footer_t);
|
| 1792 |
return 0; |
| 1793 |
} |
| 1794 |
|
| 1795 |
int
|
| 1796 |
vhd_read_bitmap(vhd_context_t *ctx, uint32_t block, char **bufp)
|
| 1797 |
{
|
| 1798 |
int err;
|
| 1799 |
void *buf;
|
| 1800 |
size_t size; |
| 1801 |
off64_t off; |
| 1802 |
uint64_t blk; |
| 1803 |
|
| 1804 |
buf = NULL;
|
| 1805 |
*bufp = NULL;
|
| 1806 |
|
| 1807 |
if (!vhd_type_dynamic(ctx))
|
| 1808 |
return -EINVAL;
|
| 1809 |
|
| 1810 |
err = vhd_get_bat(ctx); |
| 1811 |
if (err)
|
| 1812 |
return err;
|
| 1813 |
|
| 1814 |
if (block >= ctx->bat.entries)
|
| 1815 |
return -ERANGE;
|
| 1816 |
|
| 1817 |
blk = ctx->bat.bat[block]; |
| 1818 |
if (blk == DD_BLK_UNUSED)
|
| 1819 |
return -EINVAL;
|
| 1820 |
|
| 1821 |
off = vhd_sectors_to_bytes(blk); |
| 1822 |
size = vhd_bytes_padded(ctx->spb >> 3);
|
| 1823 |
|
| 1824 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1825 |
if (err)
|
| 1826 |
return err;
|
| 1827 |
|
| 1828 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 1829 |
if (err)
|
| 1830 |
return -err;
|
| 1831 |
|
| 1832 |
err = vhd_read(ctx, buf, size); |
| 1833 |
if (err)
|
| 1834 |
goto fail;
|
| 1835 |
|
| 1836 |
*bufp = buf; |
| 1837 |
return 0; |
| 1838 |
|
| 1839 |
fail:
|
| 1840 |
free(buf); |
| 1841 |
return err;
|
| 1842 |
} |
| 1843 |
|
| 1844 |
int
|
| 1845 |
vhd_read_block(vhd_context_t *ctx, uint32_t block, char **bufp)
|
| 1846 |
{
|
| 1847 |
int err;
|
| 1848 |
void *buf;
|
| 1849 |
size_t size; |
| 1850 |
uint64_t blk; |
| 1851 |
off64_t end, off; |
| 1852 |
|
| 1853 |
buf = NULL;
|
| 1854 |
*bufp = NULL;
|
| 1855 |
|
| 1856 |
if (!vhd_type_dynamic(ctx))
|
| 1857 |
return -EINVAL;
|
| 1858 |
|
| 1859 |
err = vhd_get_bat(ctx); |
| 1860 |
if (err)
|
| 1861 |
return err;
|
| 1862 |
|
| 1863 |
if (block >= ctx->bat.entries)
|
| 1864 |
return -ERANGE;
|
| 1865 |
|
| 1866 |
blk = ctx->bat.bat[block]; |
| 1867 |
if (blk == DD_BLK_UNUSED)
|
| 1868 |
return -EINVAL;
|
| 1869 |
|
| 1870 |
off = vhd_sectors_to_bytes(blk + ctx->bm_secs); |
| 1871 |
size = vhd_sectors_to_bytes(ctx->spb); |
| 1872 |
|
| 1873 |
err = vhd_footer_offset_at_eof(ctx, &end); |
| 1874 |
if (err)
|
| 1875 |
return err;
|
| 1876 |
|
| 1877 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 1878 |
if (err) {
|
| 1879 |
err = -err; |
| 1880 |
goto fail;
|
| 1881 |
} |
| 1882 |
|
| 1883 |
if (end < off + ctx->header.block_size) {
|
| 1884 |
size = end - off; |
| 1885 |
memset(buf + size, 0, ctx->header.block_size - size);
|
| 1886 |
} |
| 1887 |
|
| 1888 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1889 |
if (err)
|
| 1890 |
goto fail;
|
| 1891 |
|
| 1892 |
err = vhd_read(ctx, buf, size); |
| 1893 |
if (err)
|
| 1894 |
goto fail;
|
| 1895 |
|
| 1896 |
*bufp = buf; |
| 1897 |
return 0; |
| 1898 |
|
| 1899 |
fail:
|
| 1900 |
free(buf); |
| 1901 |
return err;
|
| 1902 |
} |
| 1903 |
|
| 1904 |
int
|
| 1905 |
vhd_write_footer_at(vhd_context_t *ctx, vhd_footer_t *footer, off64_t off) |
| 1906 |
{
|
| 1907 |
int err;
|
| 1908 |
void *buf;
|
| 1909 |
vhd_footer_t *f; |
| 1910 |
|
| 1911 |
f = NULL;
|
| 1912 |
|
| 1913 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, sizeof(vhd_footer_t));
|
| 1914 |
if (err) {
|
| 1915 |
err = -err; |
| 1916 |
goto out;
|
| 1917 |
} |
| 1918 |
f = buf; |
| 1919 |
|
| 1920 |
memcpy(f, footer, sizeof(vhd_footer_t));
|
| 1921 |
f->checksum = vhd_checksum_footer(f); |
| 1922 |
|
| 1923 |
err = vhd_validate_footer(f); |
| 1924 |
if (err)
|
| 1925 |
goto out;
|
| 1926 |
|
| 1927 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 1928 |
if (err)
|
| 1929 |
goto out;
|
| 1930 |
|
| 1931 |
vhd_footer_out(f); |
| 1932 |
|
| 1933 |
err = vhd_write(ctx, f, sizeof(vhd_footer_t));
|
| 1934 |
|
| 1935 |
out:
|
| 1936 |
if (err)
|
| 1937 |
VHDLOG("%s: failed writing footer at 0x%08"PRIx64": %d\n", |
| 1938 |
ctx->file, off, err); |
| 1939 |
free(f); |
| 1940 |
return err;
|
| 1941 |
} |
| 1942 |
|
| 1943 |
int
|
| 1944 |
vhd_write_footer(vhd_context_t *ctx, vhd_footer_t *footer) |
| 1945 |
{
|
| 1946 |
int err;
|
| 1947 |
off64_t off; |
| 1948 |
|
| 1949 |
if (ctx->is_block)
|
| 1950 |
err = vhd_footer_offset_at_eof(ctx, &off); |
| 1951 |
else
|
| 1952 |
err = vhd_end_of_data(ctx, &off); |
| 1953 |
if (err)
|
| 1954 |
return err;
|
| 1955 |
|
| 1956 |
err = vhd_write_footer_at(ctx, footer, off); |
| 1957 |
if (err)
|
| 1958 |
return err;
|
| 1959 |
|
| 1960 |
if (!ctx->is_block) {
|
| 1961 |
err = ftruncate(ctx->fd, off + sizeof(vhd_footer_t));
|
| 1962 |
if (err)
|
| 1963 |
return -errno;
|
| 1964 |
} |
| 1965 |
|
| 1966 |
if (!vhd_type_dynamic(ctx))
|
| 1967 |
return 0; |
| 1968 |
|
| 1969 |
return vhd_write_footer_at(ctx, footer, 0); |
| 1970 |
} |
| 1971 |
|
| 1972 |
int
|
| 1973 |
vhd_write_header_at(vhd_context_t *ctx, vhd_header_t *header, off64_t off) |
| 1974 |
{
|
| 1975 |
int err;
|
| 1976 |
vhd_header_t *h; |
| 1977 |
void *buf;
|
| 1978 |
|
| 1979 |
h = NULL;
|
| 1980 |
|
| 1981 |
if (!vhd_type_dynamic(ctx)) {
|
| 1982 |
err = -EINVAL; |
| 1983 |
goto out;
|
| 1984 |
} |
| 1985 |
|
| 1986 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, sizeof(vhd_header_t));
|
| 1987 |
if (err) {
|
| 1988 |
err = -err; |
| 1989 |
goto out;
|
| 1990 |
} |
| 1991 |
h = buf; |
| 1992 |
|
| 1993 |
memcpy(h, header, sizeof(vhd_header_t));
|
| 1994 |
|
| 1995 |
h->checksum = vhd_checksum_header(h); |
| 1996 |
err = vhd_validate_header(h); |
| 1997 |
if (err)
|
| 1998 |
goto out;
|
| 1999 |
|
| 2000 |
vhd_header_out(h); |
| 2001 |
|
| 2002 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2003 |
if (err)
|
| 2004 |
goto out;
|
| 2005 |
|
| 2006 |
err = vhd_write(ctx, h, sizeof(vhd_header_t));
|
| 2007 |
|
| 2008 |
out:
|
| 2009 |
if (err)
|
| 2010 |
VHDLOG("%s: failed writing header at 0x%08"PRIx64": %d\n", |
| 2011 |
ctx->file, off, err); |
| 2012 |
free(h); |
| 2013 |
return err;
|
| 2014 |
} |
| 2015 |
|
| 2016 |
int
|
| 2017 |
vhd_write_header(vhd_context_t *ctx, vhd_header_t *header) |
| 2018 |
{
|
| 2019 |
off64_t off; |
| 2020 |
|
| 2021 |
if (!vhd_type_dynamic(ctx))
|
| 2022 |
return -EINVAL;
|
| 2023 |
|
| 2024 |
off = ctx->footer.data_offset; |
| 2025 |
return vhd_write_header_at(ctx, header, off);
|
| 2026 |
} |
| 2027 |
|
| 2028 |
int
|
| 2029 |
vhd_write_bat(vhd_context_t *ctx, vhd_bat_t *bat) |
| 2030 |
{
|
| 2031 |
int err;
|
| 2032 |
off64_t off; |
| 2033 |
vhd_bat_t b; |
| 2034 |
void *buf;
|
| 2035 |
size_t size; |
| 2036 |
|
| 2037 |
if (!vhd_type_dynamic(ctx))
|
| 2038 |
return -EINVAL;
|
| 2039 |
|
| 2040 |
err = vhd_validate_bat(&ctx->bat); |
| 2041 |
if (err)
|
| 2042 |
return err;
|
| 2043 |
|
| 2044 |
err = vhd_validate_bat(bat); |
| 2045 |
if (err)
|
| 2046 |
return err;
|
| 2047 |
|
| 2048 |
memset(&b, 0, sizeof(vhd_bat_t)); |
| 2049 |
|
| 2050 |
off = ctx->header.table_offset; |
| 2051 |
size = vhd_bytes_padded(bat->entries * sizeof(uint32_t));
|
| 2052 |
|
| 2053 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2054 |
if (err)
|
| 2055 |
return err;
|
| 2056 |
|
| 2057 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 2058 |
if (err)
|
| 2059 |
return -err;
|
| 2060 |
b.bat = buf; |
| 2061 |
|
| 2062 |
memcpy(b.bat, bat->bat, size); |
| 2063 |
b.spb = bat->spb; |
| 2064 |
b.entries = bat->entries; |
| 2065 |
vhd_bat_out(&b); |
| 2066 |
|
| 2067 |
err = vhd_write(ctx, b.bat, size); |
| 2068 |
free(b.bat); |
| 2069 |
|
| 2070 |
return err;
|
| 2071 |
} |
| 2072 |
|
| 2073 |
static int |
| 2074 |
vhd_write_batmap_header(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 2075 |
{
|
| 2076 |
int err;
|
| 2077 |
size_t size; |
| 2078 |
off64_t off; |
| 2079 |
void *buf = NULL; |
| 2080 |
|
| 2081 |
err = vhd_batmap_header_offset(ctx, &off); |
| 2082 |
if (err)
|
| 2083 |
goto out;
|
| 2084 |
|
| 2085 |
size = vhd_bytes_padded(sizeof(*batmap));
|
| 2086 |
|
| 2087 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2088 |
if (err)
|
| 2089 |
goto out;
|
| 2090 |
|
| 2091 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 2092 |
if (err) {
|
| 2093 |
err = -err; |
| 2094 |
goto out;
|
| 2095 |
} |
| 2096 |
|
| 2097 |
vhd_batmap_header_out(batmap); |
| 2098 |
memset(buf, 0, size);
|
| 2099 |
memcpy(buf, &batmap->header, sizeof(batmap->header));
|
| 2100 |
|
| 2101 |
err = vhd_write(ctx, buf, size); |
| 2102 |
|
| 2103 |
out:
|
| 2104 |
if (err)
|
| 2105 |
VHDLOG("%s: failed writing batmap: %d\n", ctx->file, err);
|
| 2106 |
free(buf); |
| 2107 |
return err;
|
| 2108 |
} |
| 2109 |
|
| 2110 |
int
|
| 2111 |
vhd_write_batmap(vhd_context_t *ctx, vhd_batmap_t *batmap) |
| 2112 |
{
|
| 2113 |
int err;
|
| 2114 |
off64_t off; |
| 2115 |
vhd_batmap_t b; |
| 2116 |
void *buf, *map;
|
| 2117 |
size_t size, map_size; |
| 2118 |
|
| 2119 |
buf = NULL;
|
| 2120 |
map = NULL;
|
| 2121 |
|
| 2122 |
if (!vhd_has_batmap(ctx)) {
|
| 2123 |
err = -EINVAL; |
| 2124 |
goto out;
|
| 2125 |
} |
| 2126 |
|
| 2127 |
b.header = batmap->header; |
| 2128 |
b.map = batmap->map; |
| 2129 |
|
| 2130 |
b.header.checksum = vhd_checksum_batmap(ctx, &b); |
| 2131 |
err = vhd_validate_batmap(ctx, &b); |
| 2132 |
if (err)
|
| 2133 |
goto out;
|
| 2134 |
|
| 2135 |
off = b.header.batmap_offset; |
| 2136 |
map_size = vhd_sectors_to_bytes(secs_round_up_no_zero( |
| 2137 |
ctx->footer.curr_size >> (VHD_BLOCK_SHIFT + 3)));
|
| 2138 |
ASSERT(vhd_sectors_to_bytes(b.header.batmap_size) >= map_size); |
| 2139 |
|
| 2140 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2141 |
if (err)
|
| 2142 |
goto out;
|
| 2143 |
|
| 2144 |
err = posix_memalign(&map, VHD_SECTOR_SIZE, map_size); |
| 2145 |
if (err) {
|
| 2146 |
map = NULL;
|
| 2147 |
err = -err; |
| 2148 |
goto out;
|
| 2149 |
} |
| 2150 |
|
| 2151 |
memcpy(map, b.map, map_size); |
| 2152 |
|
| 2153 |
err = vhd_write(ctx, map, map_size); |
| 2154 |
if (err)
|
| 2155 |
goto out;
|
| 2156 |
|
| 2157 |
err = vhd_batmap_header_offset(ctx, &off); |
| 2158 |
if (err)
|
| 2159 |
goto out;
|
| 2160 |
|
| 2161 |
size = vhd_bytes_padded(sizeof(vhd_batmap_header_t));
|
| 2162 |
|
| 2163 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2164 |
if (err)
|
| 2165 |
goto out;
|
| 2166 |
|
| 2167 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 2168 |
if (err) {
|
| 2169 |
err = -err; |
| 2170 |
buf = NULL;
|
| 2171 |
goto out;
|
| 2172 |
} |
| 2173 |
|
| 2174 |
vhd_batmap_header_out(&b); |
| 2175 |
memset(buf, 0, size);
|
| 2176 |
memcpy(buf, &b.header, sizeof(vhd_batmap_header_t));
|
| 2177 |
|
| 2178 |
err = vhd_write(ctx, buf, size); |
| 2179 |
|
| 2180 |
out:
|
| 2181 |
if (err)
|
| 2182 |
VHDLOG("%s: failed writing batmap: %d\n", ctx->file, err);
|
| 2183 |
free(buf); |
| 2184 |
free(map); |
| 2185 |
return 0; |
| 2186 |
} |
| 2187 |
|
| 2188 |
int
|
| 2189 |
vhd_write_bitmap(vhd_context_t *ctx, uint32_t block, char *bitmap)
|
| 2190 |
{
|
| 2191 |
int err;
|
| 2192 |
off64_t off; |
| 2193 |
uint64_t blk; |
| 2194 |
size_t size; |
| 2195 |
|
| 2196 |
if (!vhd_type_dynamic(ctx))
|
| 2197 |
return -EINVAL;
|
| 2198 |
|
| 2199 |
err = vhd_validate_bat(&ctx->bat); |
| 2200 |
if (err)
|
| 2201 |
return err;
|
| 2202 |
|
| 2203 |
if (block >= ctx->bat.entries)
|
| 2204 |
return -ERANGE;
|
| 2205 |
|
| 2206 |
if ((unsigned long)bitmap & (VHD_SECTOR_SIZE - 1)) |
| 2207 |
return -EINVAL;
|
| 2208 |
|
| 2209 |
blk = ctx->bat.bat[block]; |
| 2210 |
if (blk == DD_BLK_UNUSED)
|
| 2211 |
return -EINVAL;
|
| 2212 |
|
| 2213 |
off = vhd_sectors_to_bytes(blk); |
| 2214 |
size = vhd_sectors_to_bytes(ctx->bm_secs); |
| 2215 |
|
| 2216 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2217 |
if (err)
|
| 2218 |
return err;
|
| 2219 |
|
| 2220 |
err = vhd_write(ctx, bitmap, size); |
| 2221 |
if (err)
|
| 2222 |
return err;
|
| 2223 |
|
| 2224 |
return 0; |
| 2225 |
} |
| 2226 |
|
| 2227 |
int
|
| 2228 |
vhd_write_block(vhd_context_t *ctx, uint32_t block, char *data)
|
| 2229 |
{
|
| 2230 |
int err;
|
| 2231 |
off64_t off; |
| 2232 |
size_t size; |
| 2233 |
uint64_t blk; |
| 2234 |
|
| 2235 |
if (!vhd_type_dynamic(ctx))
|
| 2236 |
return -EINVAL;
|
| 2237 |
|
| 2238 |
err = vhd_validate_bat(&ctx->bat); |
| 2239 |
if (err)
|
| 2240 |
return err;
|
| 2241 |
|
| 2242 |
if (block >= ctx->bat.entries)
|
| 2243 |
return -ERANGE;
|
| 2244 |
|
| 2245 |
if ((unsigned long)data & ~(VHD_SECTOR_SIZE -1)) |
| 2246 |
return -EINVAL;
|
| 2247 |
|
| 2248 |
blk = ctx->bat.bat[block]; |
| 2249 |
if (blk == DD_BLK_UNUSED)
|
| 2250 |
return -EINVAL;
|
| 2251 |
|
| 2252 |
off = vhd_sectors_to_bytes(blk + ctx->bm_secs); |
| 2253 |
size = vhd_sectors_to_bytes(ctx->spb); |
| 2254 |
|
| 2255 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 2256 |
if (err)
|
| 2257 |
return err;
|
| 2258 |
|
| 2259 |
err = vhd_write(ctx, data, size); |
| 2260 |
if (err)
|
| 2261 |
return err;
|
| 2262 |
|
| 2263 |
return 0; |
| 2264 |
} |
| 2265 |
|
| 2266 |
static inline int |
| 2267 |
namedup(char **dup, const char *name) |
| 2268 |
{
|
| 2269 |
*dup = NULL;
|
| 2270 |
|
| 2271 |
if (strnlen(name, MAX_NAME_LEN) >= MAX_NAME_LEN)
|
| 2272 |
return -ENAMETOOLONG;
|
| 2273 |
|
| 2274 |
*dup = strdup(name); |
| 2275 |
if (*dup == NULL) |
| 2276 |
return -ENOMEM;
|
| 2277 |
|
| 2278 |
return 0; |
| 2279 |
} |
| 2280 |
|
| 2281 |
#define vwrite (ssize_t (*)(int, void *, size_t))write |
| 2282 |
#define vpwrite (ssize_t (*)(int, void *, size_t, off_t))pwrite |
| 2283 |
|
| 2284 |
static ssize_t
|
| 2285 |
vhd_atomic_pio(ssize_t (*f) (int, void *, size_t, off_t), |
| 2286 |
int fd, void *_s, size_t n, off_t off) |
| 2287 |
{
|
| 2288 |
char *s = _s;
|
| 2289 |
size_t pos = 0;
|
| 2290 |
ssize_t res; |
| 2291 |
struct stat st;
|
| 2292 |
|
| 2293 |
memset(&st, 0, sizeof(st)); |
| 2294 |
|
| 2295 |
for (;;) {
|
| 2296 |
res = (f) (fd, s + pos, n - pos, off + pos); |
| 2297 |
switch (res) {
|
| 2298 |
case -1: |
| 2299 |
if (errno == EINTR || errno == EAGAIN)
|
| 2300 |
continue;
|
| 2301 |
else
|
| 2302 |
return 0; |
| 2303 |
break;
|
| 2304 |
case 0: |
| 2305 |
errno = EPIPE; |
| 2306 |
return pos;
|
| 2307 |
} |
| 2308 |
|
| 2309 |
if (pos + res == n)
|
| 2310 |
return n;
|
| 2311 |
|
| 2312 |
if (!st.st_size)
|
| 2313 |
if (fstat(fd, &st) == -1) |
| 2314 |
return -1; |
| 2315 |
|
| 2316 |
if (off + pos + res == st.st_size)
|
| 2317 |
return pos + res;
|
| 2318 |
|
| 2319 |
pos += (res & ~(VHD_SECTOR_SIZE - 1));
|
| 2320 |
} |
| 2321 |
|
| 2322 |
return -1; |
| 2323 |
} |
| 2324 |
|
| 2325 |
static ssize_t
|
| 2326 |
vhd_atomic_io(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) |
| 2327 |
{
|
| 2328 |
off64_t off; |
| 2329 |
ssize_t res; |
| 2330 |
ssize_t (*pf) (int, void *, size_t, off_t); |
| 2331 |
|
| 2332 |
off = lseek64(fd, 0, SEEK_CUR);
|
| 2333 |
if (off == (off_t)-1) |
| 2334 |
return -1; |
| 2335 |
|
| 2336 |
pf = (f == read ? pread : vpwrite); |
| 2337 |
res = vhd_atomic_pio(pf, fd, _s, n, off); |
| 2338 |
|
| 2339 |
if (res > 0) |
| 2340 |
if (lseek64(fd, off + res, SEEK_SET) == (off64_t)-1) |
| 2341 |
return -1; |
| 2342 |
|
| 2343 |
return res;
|
| 2344 |
} |
| 2345 |
|
| 2346 |
int
|
| 2347 |
vhd_seek(vhd_context_t *ctx, off64_t offset, int whence)
|
| 2348 |
{
|
| 2349 |
off64_t off; |
| 2350 |
|
| 2351 |
off = lseek64(ctx->fd, offset, whence); |
| 2352 |
if (off == (off64_t)-1) { |
| 2353 |
VHDLOG("%s: seek(0x%08"PRIx64", %d) failed: %d\n", |
| 2354 |
ctx->file, offset, whence, -errno); |
| 2355 |
return -errno;
|
| 2356 |
} |
| 2357 |
|
| 2358 |
return 0; |
| 2359 |
} |
| 2360 |
|
| 2361 |
off64_t |
| 2362 |
vhd_position(vhd_context_t *ctx) |
| 2363 |
{
|
| 2364 |
return lseek64(ctx->fd, 0, SEEK_CUR); |
| 2365 |
} |
| 2366 |
|
| 2367 |
int
|
| 2368 |
vhd_read(vhd_context_t *ctx, void *buf, size_t size)
|
| 2369 |
{
|
| 2370 |
size_t ret; |
| 2371 |
|
| 2372 |
errno = 0;
|
| 2373 |
|
| 2374 |
ret = vhd_atomic_io(read, ctx->fd, buf, size); |
| 2375 |
if (ret == size)
|
| 2376 |
return 0; |
| 2377 |
|
| 2378 |
VHDLOG("%s: read of %zu returned %zd, errno: %d\n",
|
| 2379 |
ctx->file, size, ret, -errno); |
| 2380 |
|
| 2381 |
return (errno ? -errno : -EIO);
|
| 2382 |
} |
| 2383 |
|
| 2384 |
int
|
| 2385 |
vhd_write(vhd_context_t *ctx, void *buf, size_t size)
|
| 2386 |
{
|
| 2387 |
size_t ret; |
| 2388 |
|
| 2389 |
errno = 0;
|
| 2390 |
|
| 2391 |
ret = vhd_atomic_io(vwrite, ctx->fd, buf, size); |
| 2392 |
if (ret == size)
|
| 2393 |
return 0; |
| 2394 |
|
| 2395 |
VHDLOG("%s: write of %zu returned %zd, errno: %d\n",
|
| 2396 |
ctx->file, size, ret, -errno); |
| 2397 |
|
| 2398 |
return (errno ? -errno : -EIO);
|
| 2399 |
} |
| 2400 |
|
| 2401 |
static int |
| 2402 |
vhd_pread(vhd_context_t *ctx, void *buf, size_t size, off64_t offset)
|
| 2403 |
{
|
| 2404 |
ssize_t ret; |
| 2405 |
|
| 2406 |
errno = 0;
|
| 2407 |
|
| 2408 |
ret = vhd_atomic_pio(pread, ctx->fd, buf, size, offset); |
| 2409 |
if (ret == size)
|
| 2410 |
return 0; |
| 2411 |
|
| 2412 |
VHDLOG("%s: pread of %zu returned %zd, errno: %d\n",
|
| 2413 |
ctx->file, size, ret, -errno); |
| 2414 |
|
| 2415 |
return (errno ? -errno : -EIO);
|
| 2416 |
} |
| 2417 |
|
| 2418 |
static int |
| 2419 |
vhd_pwrite(vhd_context_t *ctx, void *buf, size_t size, off64_t offset)
|
| 2420 |
{
|
| 2421 |
ssize_t ret; |
| 2422 |
|
| 2423 |
errno = 0;
|
| 2424 |
|
| 2425 |
ret = vhd_atomic_pio(vpwrite, ctx->fd, buf, size, offset); |
| 2426 |
if (ret == size)
|
| 2427 |
return 0; |
| 2428 |
|
| 2429 |
VHDLOG("%s: pwrite of %zu returned %zd, errno: %d\n",
|
| 2430 |
ctx->file, size, ret, -errno); |
| 2431 |
|
| 2432 |
return (errno ? -errno : -EIO);
|
| 2433 |
} |
| 2434 |
|
| 2435 |
int
|
| 2436 |
vhd_offset(vhd_context_t *ctx, uint32_t sector, uint32_t *offset) |
| 2437 |
{
|
| 2438 |
int err;
|
| 2439 |
uint32_t block; |
| 2440 |
|
| 2441 |
if (!vhd_type_dynamic(ctx))
|
| 2442 |
return sector;
|
| 2443 |
|
| 2444 |
err = vhd_get_bat(ctx); |
| 2445 |
if (err)
|
| 2446 |
return err;
|
| 2447 |
|
| 2448 |
block = sector / ctx->spb; |
| 2449 |
if (ctx->bat.bat[block] == DD_BLK_UNUSED)
|
| 2450 |
*offset = DD_BLK_UNUSED; |
| 2451 |
else
|
| 2452 |
*offset = ctx->bat.bat[block] + |
| 2453 |
ctx->bm_secs + (sector % ctx->spb); |
| 2454 |
|
| 2455 |
return 0; |
| 2456 |
} |
| 2457 |
|
| 2458 |
int
|
| 2459 |
vhd_open_fast(vhd_context_t *ctx) |
| 2460 |
{
|
| 2461 |
int err;
|
| 2462 |
void *buf;
|
| 2463 |
size_t size; |
| 2464 |
|
| 2465 |
size = sizeof(vhd_footer_t) + sizeof(vhd_header_t); |
| 2466 |
err = posix_memalign(&buf, VHD_SECTOR_SIZE, size); |
| 2467 |
if (err) {
|
| 2468 |
VHDLOG("failed allocating %s: %d\n", ctx->file, -err);
|
| 2469 |
return -err;
|
| 2470 |
} |
| 2471 |
|
| 2472 |
err = vhd_read(ctx, buf, size); |
| 2473 |
if (err) {
|
| 2474 |
VHDLOG("failed reading %s: %d\n", ctx->file, err);
|
| 2475 |
goto out;
|
| 2476 |
} |
| 2477 |
|
| 2478 |
memcpy(&ctx->footer, buf, sizeof(vhd_footer_t));
|
| 2479 |
vhd_footer_in(&ctx->footer); |
| 2480 |
err = vhd_validate_footer(&ctx->footer); |
| 2481 |
if (err)
|
| 2482 |
goto out;
|
| 2483 |
|
| 2484 |
if (vhd_type_dynamic(ctx)) {
|
| 2485 |
if (ctx->footer.data_offset != sizeof(vhd_footer_t)) |
| 2486 |
err = vhd_read_header(ctx, &ctx->header); |
| 2487 |
else {
|
| 2488 |
memcpy(&ctx->header, |
| 2489 |
buf + sizeof(vhd_footer_t),
|
| 2490 |
sizeof(vhd_header_t));
|
| 2491 |
vhd_header_in(&ctx->header); |
| 2492 |
err = vhd_validate_header(&ctx->header); |
| 2493 |
} |
| 2494 |
|
| 2495 |
if (err)
|
| 2496 |
goto out;
|
| 2497 |
|
| 2498 |
ctx->spb = ctx->header.block_size >> VHD_SECTOR_SHIFT; |
| 2499 |
ctx->bm_secs = secs_round_up_no_zero(ctx->spb >> 3);
|
| 2500 |
} |
| 2501 |
|
| 2502 |
out:
|
| 2503 |
free(buf); |
| 2504 |
return err;
|
| 2505 |
} |
| 2506 |
|
| 2507 |
int
|
| 2508 |
vhd_open(vhd_context_t *ctx, const char *file, int flags) |
| 2509 |
{
|
| 2510 |
int i, err, oflags;
|
| 2511 |
|
| 2512 |
if (flags & VHD_OPEN_STRICT)
|
| 2513 |
vhd_flag_clear(flags, VHD_OPEN_FAST); |
| 2514 |
|
| 2515 |
memset(ctx, 0, sizeof(vhd_context_t)); |
| 2516 |
vhd_cache_init(ctx); |
| 2517 |
|
| 2518 |
ctx->fd = -1;
|
| 2519 |
ctx->oflags = flags; |
| 2520 |
|
| 2521 |
err = namedup(&ctx->file, file); |
| 2522 |
if (err)
|
| 2523 |
return err;
|
| 2524 |
|
| 2525 |
oflags = O_LARGEFILE; |
| 2526 |
if (!(flags & VHD_OPEN_CACHED))
|
| 2527 |
oflags |= O_DIRECT; |
| 2528 |
if (flags & VHD_OPEN_RDONLY)
|
| 2529 |
oflags |= O_RDONLY; |
| 2530 |
if (flags & VHD_OPEN_RDWR)
|
| 2531 |
oflags |= O_RDWR; |
| 2532 |
|
| 2533 |
ctx->fd = open(ctx->file, oflags, 0644);
|
| 2534 |
if (ctx->fd == -1) { |
| 2535 |
err = -errno; |
| 2536 |
VHDLOG("failed to open %s: %d\n", ctx->file, err);
|
| 2537 |
goto fail;
|
| 2538 |
} |
| 2539 |
|
| 2540 |
err = vhd_test_file_fixed(ctx->file, &ctx->is_block); |
| 2541 |
if (err)
|
| 2542 |
goto fail;
|
| 2543 |
|
| 2544 |
if (flags & VHD_OPEN_FAST) {
|
| 2545 |
err = vhd_open_fast(ctx); |
| 2546 |
if (err)
|
| 2547 |
goto fail;
|
| 2548 |
|
| 2549 |
return 0; |
| 2550 |
} |
| 2551 |
|
| 2552 |
err = vhd_read_footer(ctx, &ctx->footer); |
| 2553 |
if (err)
|
| 2554 |
goto fail;
|
| 2555 |
|
| 2556 |
if (!(flags & VHD_OPEN_IGNORE_DISABLED) && vhd_disabled(ctx)) {
|
| 2557 |
err = -EINVAL; |
| 2558 |
goto fail;
|
| 2559 |
} |
| 2560 |
|
| 2561 |
if (vhd_type_dynamic(ctx)) {
|
| 2562 |
for (i = 0; i < VHD_HEADER_MAX_RETRIES; i++) { |
| 2563 |
err = vhd_read_header(ctx, &ctx->header); |
| 2564 |
if (!err)
|
| 2565 |
break;
|
| 2566 |
VHDLOG("Error reading header, retry %d\n", i);
|
| 2567 |
sleep(1);
|
| 2568 |
} |
| 2569 |
if (err)
|
| 2570 |
goto fail;
|
| 2571 |
|
| 2572 |
ctx->spb = ctx->header.block_size >> VHD_SECTOR_SHIFT; |
| 2573 |
ctx->bm_secs = secs_round_up_no_zero(ctx->spb >> 3);
|
| 2574 |
} |
| 2575 |
|
| 2576 |
err = vhd_cache_load(ctx); |
| 2577 |
if (err) {
|
| 2578 |
VHDLOG("failed to load cache: %d\n", err);
|
| 2579 |
goto fail;
|
| 2580 |
} |
| 2581 |
|
| 2582 |
return 0; |
| 2583 |
|
| 2584 |
fail:
|
| 2585 |
if (ctx->fd != -1) |
| 2586 |
close(ctx->fd); |
| 2587 |
free(ctx->file); |
| 2588 |
memset(ctx, 0, sizeof(vhd_context_t)); |
| 2589 |
return err;
|
| 2590 |
} |
| 2591 |
|
| 2592 |
void
|
| 2593 |
vhd_close(vhd_context_t *ctx) |
| 2594 |
{
|
| 2595 |
vhd_cache_unload(ctx); |
| 2596 |
|
| 2597 |
if (ctx->file) {
|
| 2598 |
fsync(ctx->fd); |
| 2599 |
close(ctx->fd); |
| 2600 |
} |
| 2601 |
|
| 2602 |
free(ctx->file); |
| 2603 |
free(ctx->bat.bat); |
| 2604 |
free(ctx->batmap.map); |
| 2605 |
memset(ctx, 0, sizeof(vhd_context_t)); |
| 2606 |
} |
| 2607 |
|
| 2608 |
static inline void |
| 2609 |
vhd_initialize_footer(vhd_context_t *ctx, int type, uint64_t size)
|
| 2610 |
{
|
| 2611 |
memset(&ctx->footer, 0, sizeof(vhd_footer_t)); |
| 2612 |
memcpy(ctx->footer.cookie, HD_COOKIE, sizeof(ctx->footer.cookie));
|
| 2613 |
ctx->footer.features = HD_RESERVED; |
| 2614 |
ctx->footer.ff_version = HD_FF_VERSION; |
| 2615 |
ctx->footer.timestamp = vhd_time(time(NULL));
|
| 2616 |
ctx->footer.crtr_ver = VHD_CURRENT_VERSION; |
| 2617 |
ctx->footer.crtr_os = 0x00000000;
|
| 2618 |
ctx->footer.orig_size = size; |
| 2619 |
ctx->footer.curr_size = size; |
| 2620 |
ctx->footer.geometry = vhd_chs(size); |
| 2621 |
ctx->footer.type = type; |
| 2622 |
ctx->footer.saved = 0;
|
| 2623 |
ctx->footer.data_offset = 0xFFFFFFFFFFFFFFFFULL;
|
| 2624 |
strcpy(ctx->footer.crtr_app, "tap");
|
| 2625 |
uuid_generate(ctx->footer.uuid); |
| 2626 |
} |
| 2627 |
|
| 2628 |
int
|
| 2629 |
vhd_initialize_header_parent_name(vhd_context_t *ctx, const char *parent_path) |
| 2630 |
{
|
| 2631 |
int err;
|
| 2632 |
iconv_t cd; |
| 2633 |
size_t ibl, obl; |
| 2634 |
char *pname, *ppath, *dst;
|
| 2635 |
|
| 2636 |
err = 0;
|
| 2637 |
pname = NULL;
|
| 2638 |
ppath = NULL;
|
| 2639 |
|
| 2640 |
/*
|
| 2641 |
* MICROSOFT_COMPAT
|
| 2642 |
* big endian unicode here
|
| 2643 |
*/
|
| 2644 |
cd = iconv_open(UTF_16BE, "ASCII");
|
| 2645 |
if (cd == (iconv_t)-1) { |
| 2646 |
err = -errno; |
| 2647 |
goto out;
|
| 2648 |
} |
| 2649 |
|
| 2650 |
ppath = strdup(parent_path); |
| 2651 |
if (!ppath) {
|
| 2652 |
err = -ENOMEM; |
| 2653 |
goto out;
|
| 2654 |
} |
| 2655 |
|
| 2656 |
pname = basename(ppath); |
| 2657 |
if (!strcmp(pname, "")) { |
| 2658 |
err = -EINVAL; |
| 2659 |
goto out;
|
| 2660 |
} |
| 2661 |
|
| 2662 |
ibl = strlen(pname); |
| 2663 |
obl = sizeof(ctx->header.prt_name);
|
| 2664 |
dst = ctx->header.prt_name; |
| 2665 |
|
| 2666 |
memset(dst, 0, obl);
|
| 2667 |
|
| 2668 |
if (iconv(cd, &pname, &ibl, &dst, &obl) == (size_t)-1 || ibl) |
| 2669 |
err = (errno ? -errno : -EINVAL); |
| 2670 |
|
| 2671 |
out:
|
| 2672 |
iconv_close(cd); |
| 2673 |
free(ppath); |
| 2674 |
return err;
|
| 2675 |
} |
| 2676 |
|
| 2677 |
static off64_t
|
| 2678 |
get_file_size(const char *name) |
| 2679 |
{
|
| 2680 |
int fd;
|
| 2681 |
off64_t end; |
| 2682 |
|
| 2683 |
fd = open(name, O_LARGEFILE | O_RDONLY); |
| 2684 |
if (fd == -1) { |
| 2685 |
VHDLOG("unable to open '%s': %d\n", name, errno);
|
| 2686 |
return -errno;
|
| 2687 |
} |
| 2688 |
end = lseek64(fd, 0, SEEK_END);
|
| 2689 |
close(fd); |
| 2690 |
return end;
|
| 2691 |
} |
| 2692 |
|
| 2693 |
static int |
| 2694 |
vhd_initialize_header(vhd_context_t *ctx, const char *parent_path, |
| 2695 |
uint64_t size, int raw, uint64_t *psize)
|
| 2696 |
{
|
| 2697 |
int err;
|
| 2698 |
struct stat stats;
|
| 2699 |
vhd_context_t parent; |
| 2700 |
|
| 2701 |
if (!vhd_type_dynamic(ctx))
|
| 2702 |
return -EINVAL;
|
| 2703 |
|
| 2704 |
memset(&ctx->header, 0, sizeof(vhd_header_t)); |
| 2705 |
memcpy(ctx->header.cookie, DD_COOKIE, sizeof(ctx->header.cookie));
|
| 2706 |
ctx->header.data_offset = (uint64_t)-1;
|
| 2707 |
ctx->header.table_offset = VHD_SECTOR_SIZE * 3; /* 1 ftr + 2 hdr */ |
| 2708 |
ctx->header.hdr_ver = DD_VERSION; |
| 2709 |
ctx->header.block_size = VHD_BLOCK_SIZE; |
| 2710 |
ctx->header.prt_ts = 0;
|
| 2711 |
ctx->header.res1 = 0;
|
| 2712 |
ctx->header.max_bat_size = (ctx->footer.curr_size + |
| 2713 |
VHD_BLOCK_SIZE - 1) >> VHD_BLOCK_SHIFT;
|
| 2714 |
|
| 2715 |
ctx->footer.data_offset = VHD_SECTOR_SIZE; |
| 2716 |
|
| 2717 |
if (ctx->footer.type == HD_TYPE_DYNAMIC)
|
| 2718 |
return 0; |
| 2719 |
|
| 2720 |
err = stat(parent_path, &stats); |
| 2721 |
if (err == -1) |
| 2722 |
return -errno;
|
| 2723 |
|
| 2724 |
if (raw) {
|
| 2725 |
ctx->header.prt_ts = vhd_time(stats.st_mtime); |
| 2726 |
*psize = get_file_size(parent_path); |
| 2727 |
if (!size)
|
| 2728 |
size = *psize; |
| 2729 |
} |
| 2730 |
else {
|
| 2731 |
err = vhd_open(&parent, parent_path, VHD_OPEN_RDONLY); |
| 2732 |
if (err)
|
| 2733 |
return err;
|
| 2734 |
|
| 2735 |
ctx->header.prt_ts = vhd_time(stats.st_mtime); |
| 2736 |
uuid_copy(ctx->header.prt_uuid, parent.footer.uuid); |
| 2737 |
*psize = parent.footer.curr_size; |
| 2738 |
if (!size)
|
| 2739 |
size = *psize; |
| 2740 |
vhd_close(&parent); |
| 2741 |
} |
| 2742 |
if (size < *psize) {
|
| 2743 |
VHDLOG("snapshot size (%"PRIu64") < parent size (%"PRIu64")\n", |
| 2744 |
size, *psize); |
| 2745 |
return -EINVAL;
|
| 2746 |
} |
| 2747 |
ctx->footer.orig_size = size; |
| 2748 |
ctx->footer.curr_size = size; |
| 2749 |
ctx->footer.geometry = vhd_chs(size); |
| 2750 |
ctx->header.max_bat_size = |
| 2751 |
(size + VHD_BLOCK_SIZE - 1) >> VHD_BLOCK_SHIFT;
|
| 2752 |
|
| 2753 |
return vhd_initialize_header_parent_name(ctx, parent_path);
|
| 2754 |
} |
| 2755 |
|
| 2756 |
int
|
| 2757 |
vhd_write_parent_locators(vhd_context_t *ctx, const char *parent) |
| 2758 |
{
|
| 2759 |
int i, err;
|
| 2760 |
off64_t off; |
| 2761 |
uint32_t code; |
| 2762 |
|
| 2763 |
code = PLAT_CODE_NONE; |
| 2764 |
|
| 2765 |
if (ctx->footer.type != HD_TYPE_DIFF)
|
| 2766 |
return -EINVAL;
|
| 2767 |
|
| 2768 |
off = ctx->batmap.header.batmap_offset + |
| 2769 |
vhd_sectors_to_bytes(ctx->batmap.header.batmap_size); |
| 2770 |
if (off & (VHD_SECTOR_SIZE - 1)) |
| 2771 |
off = vhd_bytes_padded(off); |
| 2772 |
|
| 2773 |
for (i = 0; i < 3; i++) { |
| 2774 |
switch (i) {
|
| 2775 |
case 0: |
| 2776 |
code = PLAT_CODE_MACX; |
| 2777 |
break;
|
| 2778 |
case 1: |
| 2779 |
code = PLAT_CODE_W2KU; |
| 2780 |
break;
|
| 2781 |
case 2: |
| 2782 |
code = PLAT_CODE_W2RU; |
| 2783 |
break;
|
| 2784 |
} |
| 2785 |
|
| 2786 |
err = vhd_parent_locator_write_at(ctx, parent, off, code, |
| 2787 |
0, ctx->header.loc + i);
|
| 2788 |
if (err)
|
| 2789 |
return err;
|
| 2790 |
|
| 2791 |
off += vhd_parent_locator_size(ctx->header.loc + i); |
| 2792 |
} |
| 2793 |
|
| 2794 |
return 0; |
| 2795 |
} |
| 2796 |
|
| 2797 |
int
|
| 2798 |
vhd_change_parent(vhd_context_t *child, char *parent_path, int raw) |
| 2799 |
{
|
| 2800 |
int i, err;
|
| 2801 |
char *ppath;
|
| 2802 |
struct stat stats;
|
| 2803 |
vhd_context_t parent; |
| 2804 |
char __parent_path[PATH_MAX];
|
| 2805 |
|
| 2806 |
ppath = realpath(parent_path, __parent_path); |
| 2807 |
if (!ppath) {
|
| 2808 |
VHDLOG("error resolving parent path %s for %s: %d\n",
|
| 2809 |
parent_path, child->file, errno); |
| 2810 |
return -errno;
|
| 2811 |
} |
| 2812 |
|
| 2813 |
err = stat(ppath, &stats); |
| 2814 |
if (err == -1) { |
| 2815 |
err = -errno; |
| 2816 |
goto out;
|
| 2817 |
} |
| 2818 |
|
| 2819 |
if (!S_ISREG(stats.st_mode) && !S_ISBLK(stats.st_mode)) {
|
| 2820 |
err = -EINVAL; |
| 2821 |
goto out;
|
| 2822 |
} |
| 2823 |
|
| 2824 |
if (raw) {
|
| 2825 |
uuid_clear(child->header.prt_uuid); |
| 2826 |
} else {
|
| 2827 |
err = vhd_open(&parent, ppath, VHD_OPEN_RDONLY); |
| 2828 |
if (err) {
|
| 2829 |
VHDLOG("error opening parent %s for %s: %d\n",
|
| 2830 |
ppath, child->file, err); |
| 2831 |
goto out;
|
| 2832 |
} |
| 2833 |
uuid_copy(child->header.prt_uuid, parent.footer.uuid); |
| 2834 |
vhd_close(&parent); |
| 2835 |
} |
| 2836 |
|
| 2837 |
vhd_initialize_header_parent_name(child, ppath); |
| 2838 |
child->header.prt_ts = vhd_time(stats.st_mtime); |
| 2839 |
|
| 2840 |
for (i = 0; i < vhd_parent_locator_count(child); i++) { |
| 2841 |
vhd_parent_locator_t *loc = child->header.loc + i; |
| 2842 |
size_t max = vhd_parent_locator_size(loc); |
| 2843 |
|
| 2844 |
switch (loc->code) {
|
| 2845 |
case PLAT_CODE_MACX:
|
| 2846 |
case PLAT_CODE_W2KU:
|
| 2847 |
case PLAT_CODE_W2RU:
|
| 2848 |
break;
|
| 2849 |
default:
|
| 2850 |
continue;
|
| 2851 |
} |
| 2852 |
|
| 2853 |
err = vhd_parent_locator_write_at(child, ppath, |
| 2854 |
loc->data_offset, |
| 2855 |
loc->code, max, loc); |
| 2856 |
if (err) {
|
| 2857 |
VHDLOG("error writing parent locator %d for %s: %d\n",
|
| 2858 |
i, child->file, err); |
| 2859 |
goto out;
|
| 2860 |
} |
| 2861 |
} |
| 2862 |
|
| 2863 |
TEST_FAIL_AT(FAIL_REPARENT_LOCATOR); |
| 2864 |
|
| 2865 |
err = vhd_write_header(child, &child->header); |
| 2866 |
if (err) {
|
| 2867 |
VHDLOG("error writing header for %s: %d\n", child->file, err);
|
| 2868 |
goto out;
|
| 2869 |
} |
| 2870 |
|
| 2871 |
err = 0;
|
| 2872 |
|
| 2873 |
out:
|
| 2874 |
return err;
|
| 2875 |
} |
| 2876 |
|
| 2877 |
static int |
| 2878 |
vhd_create_batmap(vhd_context_t *ctx) |
| 2879 |
{
|
| 2880 |
off64_t off; |
| 2881 |
int err, map_bytes;
|
| 2882 |
vhd_batmap_header_t *header; |
| 2883 |
void *map;
|
| 2884 |
|
| 2885 |
if (!vhd_type_dynamic(ctx))
|
| 2886 |
return -EINVAL;
|
| 2887 |
|
| 2888 |
map_bytes = (ctx->header.max_bat_size + 7) >> 3; |
| 2889 |
header = &ctx->batmap.header; |
| 2890 |
|
| 2891 |
memset(header, 0, sizeof(vhd_batmap_header_t)); |
| 2892 |
memcpy(header->cookie, VHD_BATMAP_COOKIE, sizeof(header->cookie));
|
| 2893 |
|
| 2894 |
err = vhd_batmap_header_offset(ctx, &off); |
| 2895 |
if (err)
|
| 2896 |
return err;
|
| 2897 |
|
| 2898 |
header->batmap_offset = off + |
| 2899 |
vhd_bytes_padded(sizeof(vhd_batmap_header_t));
|
| 2900 |
header->batmap_size = secs_round_up_no_zero(map_bytes); |
| 2901 |
header->batmap_version = VHD_BATMAP_CURRENT_VERSION; |
| 2902 |
|
| 2903 |
map_bytes = vhd_sectors_to_bytes(header->batmap_size); |
| 2904 |
|
| 2905 |
err = posix_memalign(&map, VHD_SECTOR_SIZE, map_bytes); |
| 2906 |
if (err)
|
| 2907 |
return -err;
|
| 2908 |
|
| 2909 |
memset(map, 0, map_bytes);
|
| 2910 |
ctx->batmap.map = map; |
| 2911 |
|
| 2912 |
return vhd_write_batmap(ctx, &ctx->batmap);
|
| 2913 |
} |
| 2914 |
|
| 2915 |
static int |
| 2916 |
vhd_create_bat(vhd_context_t *ctx) |
| 2917 |
{
|
| 2918 |
int i, err;
|
| 2919 |
size_t size; |
| 2920 |
void *bat;
|
| 2921 |
|
| 2922 |
if (!vhd_type_dynamic(ctx))
|
| 2923 |
return -EINVAL;
|
| 2924 |
|
| 2925 |
size = vhd_bytes_padded(ctx->header.max_bat_size * sizeof(uint32_t));
|
| 2926 |
err = posix_memalign(&bat, VHD_SECTOR_SIZE, size); |
| 2927 |
if (err)
|
| 2928 |
return err;
|
| 2929 |
|
| 2930 |
ctx->bat.bat = bat; |
| 2931 |
|
| 2932 |
memset(ctx->bat.bat, 0, size);
|
| 2933 |
for (i = 0; i < ctx->header.max_bat_size; i++) |
| 2934 |
ctx->bat.bat[i] = DD_BLK_UNUSED; |
| 2935 |
|
| 2936 |
err = vhd_seek(ctx, ctx->header.table_offset, SEEK_SET); |
| 2937 |
if (err)
|
| 2938 |
return err;
|
| 2939 |
|
| 2940 |
ctx->bat.entries = ctx->header.max_bat_size; |
| 2941 |
ctx->bat.spb = ctx->header.block_size >> VHD_SECTOR_SHIFT; |
| 2942 |
|
| 2943 |
return vhd_write_bat(ctx, &ctx->bat);
|
| 2944 |
} |
| 2945 |
|
| 2946 |
static int |
| 2947 |
vhd_initialize_fixed_disk(vhd_context_t *ctx) |
| 2948 |
{
|
| 2949 |
char *buf;
|
| 2950 |
int i, err;
|
| 2951 |
|
| 2952 |
if (ctx->footer.type != HD_TYPE_FIXED)
|
| 2953 |
return -EINVAL;
|
| 2954 |
|
| 2955 |
err = vhd_seek(ctx, 0, SEEK_SET);
|
| 2956 |
if (err)
|
| 2957 |
return err;
|
| 2958 |
|
| 2959 |
buf = mmap(0, VHD_BLOCK_SIZE, PROT_READ,
|
| 2960 |
MAP_SHARED | MAP_ANONYMOUS, -1, 0); |
| 2961 |
if (buf == MAP_FAILED)
|
| 2962 |
return -errno;
|
| 2963 |
|
| 2964 |
for (i = 0; i < ctx->footer.curr_size >> VHD_BLOCK_SHIFT; i++) { |
| 2965 |
err = vhd_write(ctx, buf, VHD_BLOCK_SIZE); |
| 2966 |
if (err)
|
| 2967 |
goto out;
|
| 2968 |
} |
| 2969 |
|
| 2970 |
err = 0;
|
| 2971 |
|
| 2972 |
out:
|
| 2973 |
munmap(buf, VHD_BLOCK_SIZE); |
| 2974 |
return err;
|
| 2975 |
} |
| 2976 |
|
| 2977 |
int
|
| 2978 |
vhd_get_phys_size(vhd_context_t *ctx, off64_t *size) |
| 2979 |
{
|
| 2980 |
int err;
|
| 2981 |
|
| 2982 |
if ((err = vhd_end_of_data(ctx, size)))
|
| 2983 |
return err;
|
| 2984 |
*size += sizeof(vhd_footer_t);
|
| 2985 |
return 0; |
| 2986 |
} |
| 2987 |
|
| 2988 |
int
|
| 2989 |
vhd_set_phys_size(vhd_context_t *ctx, off64_t size) |
| 2990 |
{
|
| 2991 |
off64_t phys_size; |
| 2992 |
int err;
|
| 2993 |
|
| 2994 |
err = vhd_get_phys_size(ctx, &phys_size); |
| 2995 |
if (err)
|
| 2996 |
return err;
|
| 2997 |
if (size < phys_size) {
|
| 2998 |
// would result in data loss
|
| 2999 |
VHDLOG("ERROR: new size (%"PRIu64") < phys size (%"PRIu64")\n", |
| 3000 |
size, phys_size); |
| 3001 |
return -EINVAL;
|
| 3002 |
} |
| 3003 |
return vhd_write_footer_at(ctx, &ctx->footer,
|
| 3004 |
size - sizeof(vhd_footer_t));
|
| 3005 |
} |
| 3006 |
|
| 3007 |
static int |
| 3008 |
vhd_set_virt_size_no_write(vhd_context_t *ctx, uint64_t size) |
| 3009 |
{
|
| 3010 |
if ((size >> VHD_BLOCK_SHIFT) > ctx->header.max_bat_size) {
|
| 3011 |
VHDLOG("not enough metadata space reserved for fast "
|
| 3012 |
"resize (BAT size %u, need %"PRIu64")\n", |
| 3013 |
ctx->header.max_bat_size, |
| 3014 |
size >> VHD_BLOCK_SHIFT); |
| 3015 |
return -EINVAL;
|
| 3016 |
} |
| 3017 |
|
| 3018 |
/* update footer */
|
| 3019 |
ctx->footer.curr_size = size; |
| 3020 |
ctx->footer.geometry = vhd_chs(ctx->footer.curr_size); |
| 3021 |
ctx->footer.checksum = vhd_checksum_footer(&ctx->footer); |
| 3022 |
return 0; |
| 3023 |
} |
| 3024 |
|
| 3025 |
int
|
| 3026 |
vhd_set_virt_size(vhd_context_t *ctx, uint64_t size) |
| 3027 |
{
|
| 3028 |
int err;
|
| 3029 |
|
| 3030 |
err = vhd_set_virt_size_no_write(ctx, size); |
| 3031 |
if (err)
|
| 3032 |
return err;
|
| 3033 |
return vhd_write_footer(ctx, &ctx->footer);
|
| 3034 |
} |
| 3035 |
|
| 3036 |
static int |
| 3037 |
__vhd_create(const char *name, const char *parent, uint64_t bytes, int type, |
| 3038 |
uint64_t mbytes, vhd_flag_creat_t flags) |
| 3039 |
{
|
| 3040 |
int err;
|
| 3041 |
off64_t off; |
| 3042 |
vhd_context_t ctx; |
| 3043 |
uint64_t size, psize, blks; |
| 3044 |
|
| 3045 |
switch (type) {
|
| 3046 |
case HD_TYPE_DIFF:
|
| 3047 |
if (!parent)
|
| 3048 |
return -EINVAL;
|
| 3049 |
case HD_TYPE_FIXED:
|
| 3050 |
case HD_TYPE_DYNAMIC:
|
| 3051 |
break;
|
| 3052 |
default:
|
| 3053 |
return -EINVAL;
|
| 3054 |
} |
| 3055 |
|
| 3056 |
if (strnlen(name, VHD_MAX_NAME_LEN - 1) == VHD_MAX_NAME_LEN - 1) |
| 3057 |
return -ENAMETOOLONG;
|
| 3058 |
|
| 3059 |
if (bytes && mbytes && mbytes < bytes)
|
| 3060 |
return -EINVAL;
|
| 3061 |
|
| 3062 |
memset(&ctx, 0, sizeof(vhd_context_t)); |
| 3063 |
psize = 0;
|
| 3064 |
blks = (bytes + VHD_BLOCK_SIZE - 1) >> VHD_BLOCK_SHIFT;
|
| 3065 |
/* If mbytes is provided (virtual-size-for-metadata-preallocation),
|
| 3066 |
* create the VHD of size mbytes, which will create the BAT & the
|
| 3067 |
* batmap of the appropriate size. Once the BAT & batmap are
|
| 3068 |
* initialized, reset the virtual size to the requested one.
|
| 3069 |
*/
|
| 3070 |
if (mbytes)
|
| 3071 |
blks = (mbytes + VHD_BLOCK_SIZE - 1) >> VHD_BLOCK_SHIFT;
|
| 3072 |
size = blks << VHD_BLOCK_SHIFT; |
| 3073 |
|
| 3074 |
ctx.fd = open(name, O_WRONLY | O_CREAT | |
| 3075 |
O_TRUNC | O_LARGEFILE | O_DIRECT, 0644);
|
| 3076 |
if (ctx.fd == -1) |
| 3077 |
return -errno;
|
| 3078 |
|
| 3079 |
ctx.file = strdup(name); |
| 3080 |
if (!ctx.file) {
|
| 3081 |
err = -ENOMEM; |
| 3082 |
goto out;
|
| 3083 |
} |
| 3084 |
|
| 3085 |
err = vhd_test_file_fixed(ctx.file, &ctx.is_block); |
| 3086 |
if (err)
|
| 3087 |
goto out;
|
| 3088 |
|
| 3089 |
vhd_initialize_footer(&ctx, type, size); |
| 3090 |
|
| 3091 |
if (type == HD_TYPE_FIXED) {
|
| 3092 |
err = vhd_initialize_fixed_disk(&ctx); |
| 3093 |
if (err)
|
| 3094 |
goto out;
|
| 3095 |
} else {
|
| 3096 |
int raw = vhd_flag_test(flags, VHD_FLAG_CREAT_PARENT_RAW);
|
| 3097 |
err = vhd_initialize_header(&ctx, parent, size, raw, &psize); |
| 3098 |
if (err)
|
| 3099 |
goto out;
|
| 3100 |
|
| 3101 |
err = vhd_create_batmap(&ctx); |
| 3102 |
if (err)
|
| 3103 |
goto out;
|
| 3104 |
|
| 3105 |
err = vhd_create_bat(&ctx); |
| 3106 |
if (err)
|
| 3107 |
goto out;
|
| 3108 |
|
| 3109 |
if (type == HD_TYPE_DIFF) {
|
| 3110 |
err = vhd_write_parent_locators(&ctx, parent); |
| 3111 |
if (err)
|
| 3112 |
goto out;
|
| 3113 |
} |
| 3114 |
} |
| 3115 |
|
| 3116 |
if (mbytes) {
|
| 3117 |
/* set the virtual size to the requested size */
|
| 3118 |
if (bytes) {
|
| 3119 |
blks = (bytes + VHD_BLOCK_SIZE - 1) >> VHD_BLOCK_SHIFT;
|
| 3120 |
size = blks << VHD_BLOCK_SHIFT; |
| 3121 |
|
| 3122 |
} |
| 3123 |
else {
|
| 3124 |
size = psize; |
| 3125 |
} |
| 3126 |
ctx.footer.orig_size = size; |
| 3127 |
err = vhd_set_virt_size_no_write(&ctx, size); |
| 3128 |
if (err)
|
| 3129 |
goto out;
|
| 3130 |
} |
| 3131 |
|
| 3132 |
if (type != HD_TYPE_FIXED) {
|
| 3133 |
err = vhd_write_footer_at(&ctx, &ctx.footer, 0);
|
| 3134 |
if (err)
|
| 3135 |
goto out;
|
| 3136 |
|
| 3137 |
err = vhd_write_header_at(&ctx, &ctx.header, VHD_SECTOR_SIZE); |
| 3138 |
if (err)
|
| 3139 |
goto out;
|
| 3140 |
} |
| 3141 |
|
| 3142 |
err = vhd_seek(&ctx, 0, SEEK_END);
|
| 3143 |
if (err)
|
| 3144 |
goto out;
|
| 3145 |
|
| 3146 |
off = vhd_position(&ctx); |
| 3147 |
if (off == (off64_t)-1) { |
| 3148 |
err = -errno; |
| 3149 |
goto out;
|
| 3150 |
} |
| 3151 |
|
| 3152 |
if (ctx.is_block)
|
| 3153 |
off -= sizeof(vhd_footer_t);
|
| 3154 |
|
| 3155 |
err = vhd_write_footer_at(&ctx, &ctx.footer, off); |
| 3156 |
if (err)
|
| 3157 |
goto out;
|
| 3158 |
|
| 3159 |
err = 0;
|
| 3160 |
|
| 3161 |
out:
|
| 3162 |
vhd_close(&ctx); |
| 3163 |
if (err && !ctx.is_block)
|
| 3164 |
unlink(name); |
| 3165 |
return err;
|
| 3166 |
} |
| 3167 |
|
| 3168 |
int
|
| 3169 |
vhd_create(const char *name, uint64_t bytes, int type, uint64_t mbytes, |
| 3170 |
vhd_flag_creat_t flags) |
| 3171 |
{
|
| 3172 |
return __vhd_create(name, NULL, bytes, type, mbytes, flags); |
| 3173 |
} |
| 3174 |
|
| 3175 |
int
|
| 3176 |
vhd_snapshot(const char *name, uint64_t bytes, const char *parent, |
| 3177 |
uint64_t mbytes, vhd_flag_creat_t flags) |
| 3178 |
{
|
| 3179 |
return __vhd_create(name, parent, bytes, HD_TYPE_DIFF, mbytes, flags);
|
| 3180 |
} |
| 3181 |
|
| 3182 |
static int |
| 3183 |
__vhd_io_fixed_read(vhd_context_t *ctx, |
| 3184 |
char *buf, uint64_t sec, uint32_t secs)
|
| 3185 |
{
|
| 3186 |
int err;
|
| 3187 |
|
| 3188 |
err = vhd_seek(ctx, vhd_sectors_to_bytes(sec), SEEK_SET); |
| 3189 |
if (err)
|
| 3190 |
return err;
|
| 3191 |
|
| 3192 |
return vhd_read(ctx, buf, vhd_sectors_to_bytes(secs));
|
| 3193 |
} |
| 3194 |
|
| 3195 |
static void |
| 3196 |
__vhd_io_dynamic_copy_data(vhd_context_t *ctx, |
| 3197 |
char *map, int map_off, |
| 3198 |
char *bitmap, int bitmap_off, |
| 3199 |
char *dst, char *src, int secs) |
| 3200 |
{
|
| 3201 |
int i;
|
| 3202 |
|
| 3203 |
for (i = 0; i < secs; i++) { |
| 3204 |
if (test_bit(map, map_off + i))
|
| 3205 |
goto next;
|
| 3206 |
|
| 3207 |
if (ctx && !vhd_bitmap_test(ctx, bitmap, bitmap_off + i))
|
| 3208 |
goto next;
|
| 3209 |
|
| 3210 |
memcpy(dst, src, VHD_SECTOR_SIZE); |
| 3211 |
set_bit(map, map_off + i); |
| 3212 |
|
| 3213 |
next:
|
| 3214 |
src += VHD_SECTOR_SIZE; |
| 3215 |
dst += VHD_SECTOR_SIZE; |
| 3216 |
} |
| 3217 |
} |
| 3218 |
|
| 3219 |
static int |
| 3220 |
__vhd_io_dynamic_read_link(vhd_context_t *ctx, char *map,
|
| 3221 |
char *buf, uint64_t sector, uint32_t secs)
|
| 3222 |
{
|
| 3223 |
off64_t off; |
| 3224 |
uint32_t blk, sec; |
| 3225 |
int err, cnt, map_off;
|
| 3226 |
char *bitmap, *data, *src;
|
| 3227 |
|
| 3228 |
map_off = 0;
|
| 3229 |
|
| 3230 |
do {
|
| 3231 |
blk = sector / ctx->spb; |
| 3232 |
sec = sector % ctx->spb; |
| 3233 |
off = ctx->bat.bat[blk]; |
| 3234 |
data = NULL;
|
| 3235 |
bitmap = NULL;
|
| 3236 |
|
| 3237 |
if (off == DD_BLK_UNUSED) {
|
| 3238 |
cnt = MIN(secs, ctx->spb); |
| 3239 |
goto next;
|
| 3240 |
} |
| 3241 |
|
| 3242 |
err = vhd_read_bitmap(ctx, blk, &bitmap); |
| 3243 |
if (err)
|
| 3244 |
return err;
|
| 3245 |
|
| 3246 |
err = vhd_read_block(ctx, blk, &data); |
| 3247 |
if (err) {
|
| 3248 |
free(bitmap); |
| 3249 |
return err;
|
| 3250 |
} |
| 3251 |
|
| 3252 |
cnt = MIN(secs, ctx->spb - sec); |
| 3253 |
src = data + vhd_sectors_to_bytes(sec); |
| 3254 |
|
| 3255 |
__vhd_io_dynamic_copy_data(ctx, |
| 3256 |
map, map_off, |
| 3257 |
bitmap, sec, |
| 3258 |
buf, src, cnt); |
| 3259 |
|
| 3260 |
next:
|
| 3261 |
free(data); |
| 3262 |
free(bitmap); |
| 3263 |
|
| 3264 |
secs -= cnt; |
| 3265 |
sector += cnt; |
| 3266 |
map_off += cnt; |
| 3267 |
buf += vhd_sectors_to_bytes(cnt); |
| 3268 |
|
| 3269 |
} while (secs);
|
| 3270 |
|
| 3271 |
return 0; |
| 3272 |
} |
| 3273 |
|
| 3274 |
static int |
| 3275 |
__raw_read_link(char *filename,
|
| 3276 |
char *map, char *buf, uint64_t sec, uint32_t secs) |
| 3277 |
{
|
| 3278 |
int fd, err;
|
| 3279 |
off64_t off; |
| 3280 |
uint64_t size; |
| 3281 |
void *data;
|
| 3282 |
|
| 3283 |
err = 0;
|
| 3284 |
errno = 0;
|
| 3285 |
fd = open(filename, O_RDONLY | O_DIRECT | O_LARGEFILE); |
| 3286 |
if (fd == -1) { |
| 3287 |
VHDLOG("%s: failed to open: %d\n", filename, -errno);
|
| 3288 |
return -errno;
|
| 3289 |
} |
| 3290 |
|
| 3291 |
off = lseek64(fd, vhd_sectors_to_bytes(sec), SEEK_SET); |
| 3292 |
if (off == (off64_t)-1) { |
| 3293 |
VHDLOG("%s: seek(0x%08"PRIx64") failed: %d\n", |
| 3294 |
filename, vhd_sectors_to_bytes(sec), -errno); |
| 3295 |
err = -errno; |
| 3296 |
goto close;
|
| 3297 |
} |
| 3298 |
|
| 3299 |
size = vhd_sectors_to_bytes(secs); |
| 3300 |
err = posix_memalign(&data, VHD_SECTOR_SIZE, size); |
| 3301 |
if (err)
|
| 3302 |
goto close;
|
| 3303 |
|
| 3304 |
err = read(fd, data, size); |
| 3305 |
if (err != size) {
|
| 3306 |
VHDLOG("%s: reading of %"PRIu64" returned %d, errno: %d\n", |
| 3307 |
filename, size, err, -errno); |
| 3308 |
free(data); |
| 3309 |
err = errno ? -errno : -EIO; |
| 3310 |
goto close;
|
| 3311 |
} |
| 3312 |
__vhd_io_dynamic_copy_data(NULL, map, 0, NULL, 0, buf, data, secs); |
| 3313 |
free(data); |
| 3314 |
err = 0;
|
| 3315 |
|
| 3316 |
close:
|
| 3317 |
close(fd); |
| 3318 |
return err;
|
| 3319 |
} |
| 3320 |
|
| 3321 |
static int |
| 3322 |
__vhd_io_dynamic_read(vhd_context_t *ctx, |
| 3323 |
char *buf, uint64_t sec, uint32_t secs)
|
| 3324 |
{
|
| 3325 |
int err;
|
| 3326 |
uint32_t i, done; |
| 3327 |
char *map, *next;
|
| 3328 |
vhd_context_t parent, *vhd; |
| 3329 |
|
| 3330 |
err = vhd_get_bat(ctx); |
| 3331 |
if (err)
|
| 3332 |
return err;
|
| 3333 |
|
| 3334 |
vhd = ctx; |
| 3335 |
next = NULL;
|
| 3336 |
map = calloc(1, secs << (VHD_SECTOR_SHIFT - 3)); |
| 3337 |
if (!map)
|
| 3338 |
return -ENOMEM;
|
| 3339 |
|
| 3340 |
memset(buf, 0, vhd_sectors_to_bytes(secs));
|
| 3341 |
|
| 3342 |
for (;;) {
|
| 3343 |
err = __vhd_io_dynamic_read_link(vhd, map, buf, sec, secs); |
| 3344 |
if (err)
|
| 3345 |
goto close;
|
| 3346 |
|
| 3347 |
for (done = 0, i = 0; i < secs; i++) |
| 3348 |
if (test_bit(map, i))
|
| 3349 |
done++; |
| 3350 |
|
| 3351 |
if (done == secs) {
|
| 3352 |
err = 0;
|
| 3353 |
goto close;
|
| 3354 |
} |
| 3355 |
|
| 3356 |
if (vhd->footer.type == HD_TYPE_DIFF) {
|
| 3357 |
vhd_context_t *p; |
| 3358 |
p = vhd_cache_get_parent(vhd); |
| 3359 |
if (p) {
|
| 3360 |
vhd = p; |
| 3361 |
err = vhd_get_bat(vhd); |
| 3362 |
if (err)
|
| 3363 |
goto out;
|
| 3364 |
continue;
|
| 3365 |
} |
| 3366 |
|
| 3367 |
err = vhd_parent_locator_get(vhd, &next); |
| 3368 |
if (err)
|
| 3369 |
goto close;
|
| 3370 |
if (vhd_parent_raw(vhd)) {
|
| 3371 |
err = __raw_read_link(next, map, buf, sec, |
| 3372 |
secs); |
| 3373 |
goto close;
|
| 3374 |
} |
| 3375 |
} else {
|
| 3376 |
err = 0;
|
| 3377 |
goto close;
|
| 3378 |
} |
| 3379 |
|
| 3380 |
if (vhd != ctx)
|
| 3381 |
vhd_close(vhd); |
| 3382 |
vhd = &parent; |
| 3383 |
|
| 3384 |
err = vhd_open(vhd, next, VHD_OPEN_RDONLY); |
| 3385 |
if (err)
|
| 3386 |
goto out;
|
| 3387 |
|
| 3388 |
err = vhd_get_bat(vhd); |
| 3389 |
if (err)
|
| 3390 |
goto close;
|
| 3391 |
|
| 3392 |
free(next); |
| 3393 |
next = NULL;
|
| 3394 |
} |
| 3395 |
|
| 3396 |
close:
|
| 3397 |
if (vhd != ctx && !vhd_flag_test(vhd->oflags, VHD_OPEN_CACHED))
|
| 3398 |
vhd_close(vhd); |
| 3399 |
out:
|
| 3400 |
free(map); |
| 3401 |
free(next); |
| 3402 |
return err;
|
| 3403 |
} |
| 3404 |
|
| 3405 |
int
|
| 3406 |
vhd_io_read(vhd_context_t *ctx, char *buf, uint64_t sec, uint32_t secs)
|
| 3407 |
{
|
| 3408 |
if (vhd_sectors_to_bytes(sec + secs) > ctx->footer.curr_size)
|
| 3409 |
return -ERANGE;
|
| 3410 |
|
| 3411 |
if (!vhd_type_dynamic(ctx))
|
| 3412 |
return __vhd_io_fixed_read(ctx, buf, sec, secs);
|
| 3413 |
|
| 3414 |
return __vhd_io_dynamic_read(ctx, buf, sec, secs);
|
| 3415 |
} |
| 3416 |
|
| 3417 |
static int |
| 3418 |
__vhd_io_fixed_write(vhd_context_t *ctx, |
| 3419 |
char *buf, uint64_t sec, uint32_t secs)
|
| 3420 |
{
|
| 3421 |
int err;
|
| 3422 |
|
| 3423 |
err = vhd_seek(ctx, vhd_sectors_to_bytes(sec), SEEK_SET); |
| 3424 |
if (err)
|
| 3425 |
return err;
|
| 3426 |
|
| 3427 |
return vhd_write(ctx, buf, vhd_sectors_to_bytes(secs));
|
| 3428 |
} |
| 3429 |
|
| 3430 |
static int |
| 3431 |
__vhd_io_allocate_block(vhd_context_t *ctx, uint32_t block) |
| 3432 |
{
|
| 3433 |
char *buf;
|
| 3434 |
size_t size; |
| 3435 |
off64_t off, max; |
| 3436 |
int err, gap, spp, secs;
|
| 3437 |
|
| 3438 |
spp = getpagesize() >> VHD_SECTOR_SHIFT; |
| 3439 |
|
| 3440 |
err = vhd_end_of_data(ctx, &max); |
| 3441 |
if (err)
|
| 3442 |
return err;
|
| 3443 |
|
| 3444 |
gap = 0;
|
| 3445 |
off = max; |
| 3446 |
max >>= VHD_SECTOR_SHIFT; |
| 3447 |
|
| 3448 |
/* data region of segment should begin on page boundary */
|
| 3449 |
if ((max + ctx->bm_secs) % spp) {
|
| 3450 |
gap = (spp - ((max + ctx->bm_secs) % spp)); |
| 3451 |
max += gap; |
| 3452 |
} |
| 3453 |
|
| 3454 |
err = vhd_seek(ctx, off, SEEK_SET); |
| 3455 |
if (err)
|
| 3456 |
return err;
|
| 3457 |
|
| 3458 |
secs = ctx->bm_secs + gap; |
| 3459 |
if (!vhd_flag_test(ctx->oflags, VHD_OPEN_IO_WRITE_SPARSE))
|
| 3460 |
secs += ctx->spb; |
| 3461 |
|
| 3462 |
size = vhd_sectors_to_bytes(secs); |
| 3463 |
buf = mmap(0, size, PROT_READ, MAP_SHARED | MAP_ANONYMOUS, -1, 0); |
| 3464 |
if (buf == MAP_FAILED)
|
| 3465 |
return -errno;
|
| 3466 |
|
| 3467 |
err = vhd_write(ctx, buf, size); |
| 3468 |
if (err)
|
| 3469 |
goto out;
|
| 3470 |
|
| 3471 |
ctx->bat.bat[block] = max; |
| 3472 |
err = vhd_write_bat(ctx, &ctx->bat); |
| 3473 |
if (err)
|
| 3474 |
goto out;
|
| 3475 |
|
| 3476 |
err = 0;
|
| 3477 |
|
| 3478 |
out:
|
| 3479 |
munmap(buf, size); |
| 3480 |
return err;
|
| 3481 |
} |
| 3482 |
|
| 3483 |
static int |
| 3484 |
__vhd_io_dynamic_write(vhd_context_t *ctx, |
| 3485 |
char *buf, uint64_t sector, uint32_t secs)
|
| 3486 |
{
|
| 3487 |
char *map;
|
| 3488 |
off64_t off; |
| 3489 |
uint32_t blk, sec; |
| 3490 |
int i, err, cnt, ret;
|
| 3491 |
|
| 3492 |
if (vhd_sectors_to_bytes(sector + secs) > ctx->footer.curr_size)
|
| 3493 |
return -ERANGE;
|
| 3494 |
|
| 3495 |
err = vhd_get_bat(ctx); |
| 3496 |
if (err)
|
| 3497 |
return err;
|
| 3498 |
|
| 3499 |
if (vhd_has_batmap(ctx)) {
|
| 3500 |
err = vhd_get_batmap(ctx); |
| 3501 |
if (err)
|
| 3502 |
return err;
|
| 3503 |
} |
| 3504 |
|
| 3505 |
do {
|
| 3506 |
blk = sector / ctx->spb; |
| 3507 |
sec = sector % ctx->spb; |
| 3508 |
|
| 3509 |
off = ctx->bat.bat[blk]; |
| 3510 |
if (off == DD_BLK_UNUSED) {
|
| 3511 |
err = __vhd_io_allocate_block(ctx, blk); |
| 3512 |
if (err)
|
| 3513 |
return err;
|
| 3514 |
|
| 3515 |
off = ctx->bat.bat[blk]; |
| 3516 |
} |
| 3517 |
|
| 3518 |
off += ctx->bm_secs + sec; |
| 3519 |
err = vhd_seek(ctx, vhd_sectors_to_bytes(off), SEEK_SET); |
| 3520 |
if (err)
|
| 3521 |
return err;
|
| 3522 |
|
| 3523 |
cnt = MIN(secs, ctx->spb - sec); |
| 3524 |
err = vhd_write(ctx, buf, vhd_sectors_to_bytes(cnt)); |
| 3525 |
if (err)
|
| 3526 |
return err;
|
| 3527 |
|
| 3528 |
if (vhd_has_batmap(ctx) &&
|
| 3529 |
vhd_batmap_test(ctx, &ctx->batmap, blk)) |
| 3530 |
goto next;
|
| 3531 |
|
| 3532 |
err = vhd_read_bitmap(ctx, blk, &map); |
| 3533 |
if (err)
|
| 3534 |
return err;
|
| 3535 |
|
| 3536 |
for (i = 0; i < cnt; i++) |
| 3537 |
vhd_bitmap_set(ctx, map, sec + i); |
| 3538 |
|
| 3539 |
err = vhd_write_bitmap(ctx, blk, map); |
| 3540 |
if (err)
|
| 3541 |
goto fail;
|
| 3542 |
|
| 3543 |
if (vhd_has_batmap(ctx)) {
|
| 3544 |
for (i = 0; i < ctx->spb; i++) |
| 3545 |
if (!vhd_bitmap_test(ctx, map, i)) {
|
| 3546 |
free(map); |
| 3547 |
goto next;
|
| 3548 |
} |
| 3549 |
|
| 3550 |
vhd_batmap_set(ctx, &ctx->batmap, blk); |
| 3551 |
err = vhd_write_batmap(ctx, &ctx->batmap); |
| 3552 |
if (err)
|
| 3553 |
goto fail;
|
| 3554 |
} |
| 3555 |
|
| 3556 |
free(map); |
| 3557 |
map = NULL;
|
| 3558 |
|
| 3559 |
next:
|
| 3560 |
secs -= cnt; |
| 3561 |
sector += cnt; |
| 3562 |
buf += vhd_sectors_to_bytes(cnt); |
| 3563 |
} while (secs);
|
| 3564 |
|
| 3565 |
err = 0;
|
| 3566 |
|
| 3567 |
out:
|
| 3568 |
ret = vhd_write_footer(ctx, &ctx->footer); |
| 3569 |
return (err ? err : ret);
|
| 3570 |
|
| 3571 |
fail:
|
| 3572 |
free(map); |
| 3573 |
goto out;
|
| 3574 |
} |
| 3575 |
|
| 3576 |
int
|
| 3577 |
vhd_io_write(vhd_context_t *ctx, char *buf, uint64_t sec, uint32_t secs)
|
| 3578 |
{
|
| 3579 |
if (vhd_sectors_to_bytes(sec + secs) > ctx->footer.curr_size)
|
| 3580 |
return -ERANGE;
|
| 3581 |
|
| 3582 |
if (!vhd_type_dynamic(ctx))
|
| 3583 |
return __vhd_io_fixed_write(ctx, buf, sec, secs);
|
| 3584 |
|
| 3585 |
return __vhd_io_dynamic_write(ctx, buf, sec, secs);
|
| 3586 |
} |
| 3587 |
|
| 3588 |
static void |
| 3589 |
vhd_cache_init(vhd_context_t *ctx) |
| 3590 |
{
|
| 3591 |
INIT_LIST_HEAD(&ctx->next); |
| 3592 |
} |
| 3593 |
|
| 3594 |
static int |
| 3595 |
vhd_cache_enabled(vhd_context_t *ctx) |
| 3596 |
{
|
| 3597 |
return vhd_flag_test(ctx->oflags, VHD_OPEN_CACHED);
|
| 3598 |
} |
| 3599 |
|
| 3600 |
static int |
| 3601 |
vhd_cache_load(vhd_context_t *ctx) |
| 3602 |
{
|
| 3603 |
char *next;
|
| 3604 |
int err, pflags;
|
| 3605 |
vhd_context_t *vhd; |
| 3606 |
|
| 3607 |
err = 1;
|
| 3608 |
pflags = ctx->oflags; |
| 3609 |
vhd = ctx; |
| 3610 |
next = NULL;
|
| 3611 |
|
| 3612 |
vhd_flag_set(pflags, VHD_OPEN_RDONLY); |
| 3613 |
vhd_flag_clear(pflags, VHD_OPEN_CACHED); |
| 3614 |
|
| 3615 |
if (!vhd_cache_enabled(vhd))
|
| 3616 |
goto done;
|
| 3617 |
|
| 3618 |
while (vhd->footer.type == HD_TYPE_DIFF) {
|
| 3619 |
vhd_context_t *parent; |
| 3620 |
|
| 3621 |
parent = NULL;
|
| 3622 |
|
| 3623 |
if (vhd_parent_raw(vhd))
|
| 3624 |
goto done;
|
| 3625 |
|
| 3626 |
err = vhd_parent_locator_get(vhd, &next); |
| 3627 |
if (err)
|
| 3628 |
goto out;
|
| 3629 |
|
| 3630 |
parent = calloc(1, sizeof(*parent)); |
| 3631 |
if (!parent)
|
| 3632 |
goto out;
|
| 3633 |
|
| 3634 |
err = vhd_open(parent, next, pflags); |
| 3635 |
if (err) {
|
| 3636 |
free(parent); |
| 3637 |
parent = NULL;
|
| 3638 |
goto out;
|
| 3639 |
} |
| 3640 |
|
| 3641 |
fcntl(parent->fd, F_SETFL, |
| 3642 |
fcntl(parent->fd, F_GETFL) & ~O_DIRECT); |
| 3643 |
vhd_flag_set(parent->oflags, VHD_OPEN_CACHED); |
| 3644 |
list_add(&parent->next, &vhd->next); |
| 3645 |
|
| 3646 |
free(next); |
| 3647 |
next = NULL;
|
| 3648 |
vhd = parent; |
| 3649 |
} |
| 3650 |
|
| 3651 |
done:
|
| 3652 |
err = 0;
|
| 3653 |
out:
|
| 3654 |
free(next); |
| 3655 |
if (err)
|
| 3656 |
vhd_cache_unload(vhd); |
| 3657 |
|
| 3658 |
return err;
|
| 3659 |
} |
| 3660 |
|
| 3661 |
static int |
| 3662 |
vhd_cache_unload(vhd_context_t *ctx) |
| 3663 |
{
|
| 3664 |
vhd_context_t *vhd, *tmp; |
| 3665 |
|
| 3666 |
if (!vhd_cache_enabled(ctx))
|
| 3667 |
goto out;
|
| 3668 |
|
| 3669 |
list_for_each_entry_safe(vhd, tmp, &ctx->next, next) {
|
| 3670 |
list_del_init(&vhd->next); |
| 3671 |
vhd_close(vhd); |
| 3672 |
free(vhd); |
| 3673 |
} |
| 3674 |
|
| 3675 |
INIT_LIST_HEAD(&ctx->next); |
| 3676 |
|
| 3677 |
out:
|
| 3678 |
return 0; |
| 3679 |
} |
| 3680 |
|
| 3681 |
static vhd_context_t *
|
| 3682 |
vhd_cache_get_parent(vhd_context_t *ctx) |
| 3683 |
{
|
| 3684 |
vhd_context_t *vhd; |
| 3685 |
|
| 3686 |
vhd = NULL;
|
| 3687 |
|
| 3688 |
if (!vhd_cache_enabled(ctx))
|
| 3689 |
goto out;
|
| 3690 |
|
| 3691 |
if (list_empty(&ctx->next))
|
| 3692 |
goto out;
|
| 3693 |
|
| 3694 |
vhd = list_entry(ctx->next.next, vhd_context_t, next); |
| 3695 |
|
| 3696 |
out:
|
| 3697 |
return vhd;
|
| 3698 |
} |
| 3699 |
|
| 3700 |
typedef struct vhd_block_vector vhd_block_vector_t; |
| 3701 |
typedef struct vhd_block_vector_entry vhd_block_vector_entry_t; |
| 3702 |
|
| 3703 |
struct vhd_block_vector_entry {
|
| 3704 |
uint64_t off; /* byte offset from block */
|
| 3705 |
uint32_t bytes; /* size in bytes */
|
| 3706 |
char *buf; /* destination buffer */ |
| 3707 |
}; |
| 3708 |
|
| 3709 |
struct vhd_block_vector {
|
| 3710 |
uint32_t block; /* logical block in vhd */
|
| 3711 |
int entries; /* number of vector entries */ |
| 3712 |
vhd_block_vector_entry_t *array; /* vector list */
|
| 3713 |
}; |
| 3714 |
|
| 3715 |
/**
|
| 3716 |
* @vec: block vector describing read
|
| 3717 |
*
|
| 3718 |
* @vec describes a list of byte-spans within a given block
|
| 3719 |
* and a corresponding list of destination buffers.
|
| 3720 |
*/
|
| 3721 |
static int |
| 3722 |
vhd_block_vector_read(vhd_context_t *ctx, vhd_block_vector_t *vec) |
| 3723 |
{
|
| 3724 |
int err, i;
|
| 3725 |
off64_t off; |
| 3726 |
uint32_t blk; |
| 3727 |
|
| 3728 |
err = vhd_get_bat(ctx); |
| 3729 |
if (err)
|
| 3730 |
goto out;
|
| 3731 |
|
| 3732 |
if (vec->block >= ctx->bat.entries) {
|
| 3733 |
err = -ERANGE; |
| 3734 |
goto out;
|
| 3735 |
} |
| 3736 |
|
| 3737 |
blk = ctx->bat.bat[vec->block]; |
| 3738 |
if (blk == DD_BLK_UNUSED) {
|
| 3739 |
err = -EINVAL; |
| 3740 |
goto out;
|
| 3741 |
} |
| 3742 |
|
| 3743 |
off = vhd_sectors_to_bytes(blk + ctx->bm_secs); |
| 3744 |
|
| 3745 |
for (i = 0; i < vec->entries; i++) { |
| 3746 |
vhd_block_vector_entry_t *v = vec->array + i; |
| 3747 |
err = vhd_pread(ctx, v->buf, v->bytes, off + v->off); |
| 3748 |
if (err)
|
| 3749 |
goto out;
|
| 3750 |
} |
| 3751 |
|
| 3752 |
out:
|
| 3753 |
return err;
|
| 3754 |
} |
| 3755 |
|
| 3756 |
/**
|
| 3757 |
* @vec: block vector to initialize
|
| 3758 |
* @block: vhd block number
|
| 3759 |
* @map: optional bitmap of sectors to map (relative to beginning of block)
|
| 3760 |
* @buf: destination buffer
|
| 3761 |
* @blk_start: byte offset relative to beginning of block
|
| 3762 |
* @blk_end: byte offset relative to beginning of block
|
| 3763 |
*
|
| 3764 |
* initializes @vec to describe a read into a contiguous buffer
|
| 3765 |
* of potentially non-contiguous byte ranges in a given vhd block.
|
| 3766 |
* only sectors with corresponding bits set in @map (if it is not NULL)
|
| 3767 |
* will be mapped; bits corresponding to unmapped sectors will be cleared.
|
| 3768 |
* first and last sector maps may be smaller than vhd sector size.
|
| 3769 |
*/
|
| 3770 |
static int |
| 3771 |
vhd_block_vector_init(vhd_context_t *ctx, |
| 3772 |
vhd_block_vector_t *vec, uint32_t block, char *map,
|
| 3773 |
char *buf, uint64_t blk_start, uint64_t blk_end)
|
| 3774 |
{
|
| 3775 |
int err, sec;
|
| 3776 |
char *bitmap;
|
| 3777 |
uint32_t first_sec, last_sec; |
| 3778 |
|
| 3779 |
bitmap = NULL;
|
| 3780 |
memset(vec, 0, sizeof(*vec)); |
| 3781 |
|
| 3782 |
first_sec = blk_start >> VHD_SECTOR_SHIFT; |
| 3783 |
last_sec = secs_round_up_no_zero(blk_end); |
| 3784 |
|
| 3785 |
err = vhd_read_bitmap(ctx, block, &bitmap); |
| 3786 |
if (err)
|
| 3787 |
goto out;
|
| 3788 |
|
| 3789 |
vec->array = calloc(ctx->spb, sizeof(vhd_block_vector_entry_t));
|
| 3790 |
if (!vec->array) {
|
| 3791 |
err = -ENOMEM; |
| 3792 |
goto out;
|
| 3793 |
} |
| 3794 |
|
| 3795 |
for (sec = first_sec; sec < last_sec; sec++) {
|
| 3796 |
uint32_t cnt; |
| 3797 |
vhd_block_vector_entry_t *v; |
| 3798 |
|
| 3799 |
cnt = VHD_SECTOR_SIZE - (blk_start & (VHD_SECTOR_SIZE - 1));
|
| 3800 |
if (cnt > blk_end - blk_start)
|
| 3801 |
cnt = blk_end - blk_start; |
| 3802 |
|
| 3803 |
if (map && !test_bit(map, sec))
|
| 3804 |
goto next;
|
| 3805 |
|
| 3806 |
if (vhd_bitmap_test(ctx, bitmap, sec)) {
|
| 3807 |
if (vec->entries > 0) { |
| 3808 |
v = vec->array + vec->entries - 1;
|
| 3809 |
if (v->off + v->bytes == blk_start) {
|
| 3810 |
v->bytes += cnt; |
| 3811 |
goto next;
|
| 3812 |
} |
| 3813 |
} |
| 3814 |
|
| 3815 |
v = vec->array + vec->entries; |
| 3816 |
v->off = blk_start; |
| 3817 |
v->bytes = cnt; |
| 3818 |
v->buf = buf; |
| 3819 |
|
| 3820 |
vec->entries++; |
| 3821 |
|
| 3822 |
} else if (map) { |
| 3823 |
clear_bit(map, sec); |
| 3824 |
} |
| 3825 |
|
| 3826 |
next:
|
| 3827 |
blk_start += cnt; |
| 3828 |
buf += cnt; |
| 3829 |
} |
| 3830 |
|
| 3831 |
vec->block = block; |
| 3832 |
|
| 3833 |
out:
|
| 3834 |
free(bitmap); |
| 3835 |
return err;
|
| 3836 |
} |
| 3837 |
|
| 3838 |
#if 0
|
| 3839 |
/**
|
| 3840 |
* @block: vhd block number
|
| 3841 |
* @buf: buffer to place data in
|
| 3842 |
* @size: number of bytes to read
|
| 3843 |
* @start: byte offset into block from which to start reading
|
| 3844 |
* @end: byte offset in block at which to stop reading
|
| 3845 |
*
|
| 3846 |
* reads data (if it exists) into @buf. partial reads may occur
|
| 3847 |
* for the first and last sectors if @start and @end are not multiples
|
| 3848 |
* of vhd sector size.
|
| 3849 |
*/
|
| 3850 |
static int
|
| 3851 |
vhd_block_vector_read_allocated(vhd_context_t *ctx, uint32_t block,
|
| 3852 |
char *buf, uint64_t start, uint64_t end)
|
| 3853 |
{
|
| 3854 |
int err;
|
| 3855 |
vhd_block_vector_t vec;
|
| 3856 |
|
| 3857 |
vec.array = NULL;
|
| 3858 |
|
| 3859 |
err = vhd_block_vector_init(ctx, &vec, block, NULL, buf, start, end);
|
| 3860 |
if (err)
|
| 3861 |
goto out;
|
| 3862 |
|
| 3863 |
err = vhd_block_vector_read(ctx, &vec);
|
| 3864 |
|
| 3865 |
out:
|
| 3866 |
free(vec.array);
|
| 3867 |
return err;
|
| 3868 |
}
|
| 3869 |
#endif
|
| 3870 |
|
| 3871 |
/**
|
| 3872 |
* @block: vhd block number
|
| 3873 |
* @map: bitmap of sectors in block which should be read
|
| 3874 |
* @buf: buffer to place data in
|
| 3875 |
* @start: byte offset into block from which to start reading
|
| 3876 |
* @end: byte offset in block at which to stop reading
|
| 3877 |
*
|
| 3878 |
* for every bit set in @map (corresponding to sectors in @block),
|
| 3879 |
* reads data (if it exists) into @buf. if data does not exist,
|
| 3880 |
* clears corresponding bit in @map. partial reads may occur
|
| 3881 |
* for the first and last sectors if @start and @end are not multiples
|
| 3882 |
* of vhd sector size.
|
| 3883 |
*/
|
| 3884 |
static int |
| 3885 |
vhd_block_vector_read_allocated_selective(vhd_context_t *ctx, |
| 3886 |
uint32_t block, char *map, char *buf, |
| 3887 |
uint64_t start, uint64_t end) |
| 3888 |
{
|
| 3889 |
int err;
|
| 3890 |
vhd_block_vector_t vec; |
| 3891 |
|
| 3892 |
vec.array = NULL;
|
| 3893 |
|
| 3894 |
err = vhd_block_vector_init(ctx, &vec, block, map, buf, start, end); |
| 3895 |
if (err)
|
| 3896 |
goto out;
|
| 3897 |
|
| 3898 |
err = vhd_block_vector_read(ctx, &vec); |
| 3899 |
|
| 3900 |
out:
|
| 3901 |
free(vec.array); |
| 3902 |
return err;
|
| 3903 |
} |
| 3904 |
|
| 3905 |
/**
|
| 3906 |
* @map: bitmap of sectors which have already been read
|
| 3907 |
* @buf: destination buffer
|
| 3908 |
* @size: size in bytes to read
|
| 3909 |
* @off: byte offset in virtual disk to read
|
| 3910 |
*
|
| 3911 |
* reads @size bytes into @buf, starting at @off, skipping sectors
|
| 3912 |
* which have corresponding bits set in @map
|
| 3913 |
*/
|
| 3914 |
static int |
| 3915 |
__vhd_io_dynamic_read_link_bytes(vhd_context_t *ctx, char *map,
|
| 3916 |
char *buf, size_t size, uint64_t off)
|
| 3917 |
{
|
| 3918 |
char *blkmap;
|
| 3919 |
int i, err, map_off;
|
| 3920 |
off64_t blk_off, blk_size; |
| 3921 |
uint32_t blk, bytes, first_sec, last_sec; |
| 3922 |
|
| 3923 |
blkmap = malloc((ctx->spb + 7) >> 3); |
| 3924 |
if (!blkmap) {
|
| 3925 |
err = -ENOMEM; |
| 3926 |
goto out;
|
| 3927 |
} |
| 3928 |
|
| 3929 |
map_off = 0;
|
| 3930 |
blk_size = vhd_sectors_to_bytes(ctx->spb); |
| 3931 |
|
| 3932 |
do {
|
| 3933 |
blk = off / blk_size; |
| 3934 |
blk_off = off % blk_size; |
| 3935 |
bytes = MIN(blk_size - blk_off, size); |
| 3936 |
|
| 3937 |
first_sec = blk_off >> VHD_SECTOR_SHIFT; |
| 3938 |
last_sec = secs_round_up_no_zero(blk_off + bytes); |
| 3939 |
|
| 3940 |
if (ctx->bat.bat[blk] == DD_BLK_UNUSED)
|
| 3941 |
goto next;
|
| 3942 |
|
| 3943 |
memset(blkmap, 0, (ctx->spb + 7) >> 3); |
| 3944 |
|
| 3945 |
for (i = 0; i < (last_sec - first_sec); i++) |
| 3946 |
if (!test_bit(map, map_off + i))
|
| 3947 |
set_bit(blkmap, first_sec + i); |
| 3948 |
|
| 3949 |
err = vhd_block_vector_read_allocated_selective(ctx, blk, |
| 3950 |
blkmap, buf, |
| 3951 |
blk_off, |
| 3952 |
blk_off + |
| 3953 |
bytes); |
| 3954 |
if (err)
|
| 3955 |
goto out;
|
| 3956 |
|
| 3957 |
for (i = 0; i < (last_sec - first_sec); i++) |
| 3958 |
if (test_bit(blkmap, first_sec + i))
|
| 3959 |
set_bit(map, map_off + i); |
| 3960 |
|
| 3961 |
next:
|
| 3962 |
size -= bytes; |
| 3963 |
off += bytes; |
| 3964 |
map_off += (last_sec - first_sec); |
| 3965 |
buf += bytes; |
| 3966 |
|
| 3967 |
} while (size);
|
| 3968 |
|
| 3969 |
err = 0;
|
| 3970 |
out:
|
| 3971 |
free(blkmap); |
| 3972 |
return err;
|
| 3973 |
} |
| 3974 |
|
| 3975 |
static int |
| 3976 |
__raw_read_link_bytes(const char *filename, |
| 3977 |
char *map, char *buf, size_t size, uint64_t off) |
| 3978 |
{
|
| 3979 |
int fd, err;
|
| 3980 |
uint32_t i, first_sec, last_sec; |
| 3981 |
|
| 3982 |
fd = open(filename, O_RDONLY | O_LARGEFILE); |
| 3983 |
if (fd == -1) { |
| 3984 |
VHDLOG("%s: failed to open: %d\n", filename, -errno);
|
| 3985 |
return -errno;
|
| 3986 |
} |
| 3987 |
|
| 3988 |
first_sec = off >> VHD_SECTOR_SHIFT; |
| 3989 |
last_sec = secs_round_up_no_zero(off + size); |
| 3990 |
|
| 3991 |
for (i = first_sec; i < last_sec; i++) {
|
| 3992 |
if (!test_bit(map, i - first_sec)) {
|
| 3993 |
uint32_t secs = 0;
|
| 3994 |
uint64_t coff, csize; |
| 3995 |
|
| 3996 |
while (i + secs < last_sec &&
|
| 3997 |
!test_bit(map, i + secs - first_sec)) |
| 3998 |
secs++; |
| 3999 |
|
| 4000 |
coff = vhd_sectors_to_bytes(i); |
| 4001 |
csize = vhd_sectors_to_bytes(secs); |
| 4002 |
|
| 4003 |
if (i == first_sec)
|
| 4004 |
coff = off; |
| 4005 |
if (secs == last_sec - 1) |
| 4006 |
csize = (off + size) - coff; |
| 4007 |
|
| 4008 |
if (pread(fd, buf + coff - off, csize, coff) != csize) {
|
| 4009 |
err = (errno ? -errno : -EIO); |
| 4010 |
goto close;
|
| 4011 |
} |
| 4012 |
|
| 4013 |
i += secs - 1;
|
| 4014 |
} |
| 4015 |
} |
| 4016 |
|
| 4017 |
err = 0;
|
| 4018 |
|
| 4019 |
close:
|
| 4020 |
close(fd); |
| 4021 |
return err;
|
| 4022 |
} |
| 4023 |
|
| 4024 |
static int |
| 4025 |
__vhd_io_dynamic_read_bytes(vhd_context_t *ctx, |
| 4026 |
char *buf, size_t size, uint64_t off)
|
| 4027 |
{
|
| 4028 |
int err;
|
| 4029 |
char *next, *map;
|
| 4030 |
vhd_context_t parent, *vhd; |
| 4031 |
uint32_t i, done, first_sec, last_sec; |
| 4032 |
|
| 4033 |
err = vhd_get_bat(ctx); |
| 4034 |
if (err)
|
| 4035 |
return err;
|
| 4036 |
|
| 4037 |
first_sec = off >> VHD_SECTOR_SHIFT; |
| 4038 |
last_sec = secs_round_up_no_zero(off + size); |
| 4039 |
|
| 4040 |
vhd = ctx; |
| 4041 |
next = NULL;
|
| 4042 |
map = calloc(1, ((last_sec - first_sec) + 7) >> 3); |
| 4043 |
if (!map) {
|
| 4044 |
err = -ENOMEM; |
| 4045 |
goto out;
|
| 4046 |
} |
| 4047 |
|
| 4048 |
for (;;) {
|
| 4049 |
err = __vhd_io_dynamic_read_link_bytes(vhd, map, |
| 4050 |
buf, size, off); |
| 4051 |
if (err)
|
| 4052 |
goto close;
|
| 4053 |
|
| 4054 |
for (done = 0, i = 0; i < (last_sec - first_sec); i++) |
| 4055 |
if (test_bit(map, i))
|
| 4056 |
done++; |
| 4057 |
|
| 4058 |
if (done == last_sec - first_sec) {
|
| 4059 |
err = 0;
|
| 4060 |
goto close;
|
| 4061 |
} |
| 4062 |
|
| 4063 |
if (vhd->footer.type == HD_TYPE_DIFF) {
|
| 4064 |
vhd_context_t *p; |
| 4065 |
p = vhd_cache_get_parent(vhd); |
| 4066 |
if (p) {
|
| 4067 |
vhd = p; |
| 4068 |
err = vhd_get_bat(vhd); |
| 4069 |
if (err)
|
| 4070 |
goto out;
|
| 4071 |
continue;
|
| 4072 |
} |
| 4073 |
|
| 4074 |
err = vhd_parent_locator_get(vhd, &next); |
| 4075 |
if (err)
|
| 4076 |
goto close;
|
| 4077 |
|
| 4078 |
if (vhd_parent_raw(vhd)) {
|
| 4079 |
err = __raw_read_link_bytes(next, map, |
| 4080 |
buf, size, off); |
| 4081 |
goto close;
|
| 4082 |
} |
| 4083 |
} else {
|
| 4084 |
err = 0;
|
| 4085 |
goto close;
|
| 4086 |
} |
| 4087 |
|
| 4088 |
if (vhd != ctx)
|
| 4089 |
vhd_close(vhd); |
| 4090 |
vhd = &parent; |
| 4091 |
|
| 4092 |
err = vhd_open(vhd, next, VHD_OPEN_RDONLY); |
| 4093 |
if (err)
|
| 4094 |
goto out;
|
| 4095 |
|
| 4096 |
err = vhd_get_bat(vhd); |
| 4097 |
if (err)
|
| 4098 |
goto close;
|
| 4099 |
|
| 4100 |
free(next); |
| 4101 |
next = NULL;
|
| 4102 |
} |
| 4103 |
|
| 4104 |
close:
|
| 4105 |
if (!err) {
|
| 4106 |
/*
|
| 4107 |
* clear any regions not present on disk
|
| 4108 |
*/
|
| 4109 |
for (i = first_sec; i < last_sec; i++) {
|
| 4110 |
if (!test_bit(map, i - first_sec)) {
|
| 4111 |
uint64_t coff = vhd_sectors_to_bytes(i); |
| 4112 |
uint32_t csize = VHD_SECTOR_SIZE; |
| 4113 |
|
| 4114 |
if (i == first_sec)
|
| 4115 |
coff = off; |
| 4116 |
if (i == last_sec - 1) |
| 4117 |
csize = (off + size) - coff; |
| 4118 |
|
| 4119 |
memset(buf + coff - off, 0, csize);
|
| 4120 |
} |
| 4121 |
} |
| 4122 |
} |
| 4123 |
|
| 4124 |
if (vhd != ctx && !vhd_flag_test(vhd->oflags, VHD_OPEN_CACHED))
|
| 4125 |
vhd_close(vhd); |
| 4126 |
out:
|
| 4127 |
free(map); |
| 4128 |
free(next); |
| 4129 |
return err;
|
| 4130 |
} |
| 4131 |
|
| 4132 |
int
|
| 4133 |
vhd_io_read_bytes(vhd_context_t *ctx, void *buf, size_t size, uint64_t off)
|
| 4134 |
{
|
| 4135 |
if (off + size > ctx->footer.curr_size)
|
| 4136 |
return -ERANGE;
|
| 4137 |
|
| 4138 |
if (!vhd_type_dynamic(ctx))
|
| 4139 |
return vhd_pread(ctx, buf, size, off);
|
| 4140 |
|
| 4141 |
return __vhd_io_dynamic_read_bytes(ctx, buf, size, off);
|
| 4142 |
} |
| 4143 |
|
| 4144 |
static int |
| 4145 |
__vhd_io_dynamic_write_bytes_aligned(vhd_context_t *ctx, |
| 4146 |
char *buf, size_t size, uint64_t off)
|
| 4147 |
{
|
| 4148 |
char *map;
|
| 4149 |
int i, err, ret;
|
| 4150 |
uint64_t blk_off, blk_size, blk_start; |
| 4151 |
uint32_t blk, bytes, first_sec, last_sec; |
| 4152 |
|
| 4153 |
if (off & (VHD_SECTOR_SIZE - 1) || size & (VHD_SECTOR_SIZE - 1)) |
| 4154 |
return -EINVAL;
|
| 4155 |
|
| 4156 |
err = vhd_get_bat(ctx); |
| 4157 |
if (err)
|
| 4158 |
return err;
|
| 4159 |
|
| 4160 |
if (vhd_has_batmap(ctx)) {
|
| 4161 |
err = vhd_get_batmap(ctx); |
| 4162 |
if (err)
|
| 4163 |
return err;
|
| 4164 |
} |
| 4165 |
|
| 4166 |
map = NULL;
|
| 4167 |
blk_size = vhd_sectors_to_bytes(ctx->spb); |
| 4168 |
|
| 4169 |
do {
|
| 4170 |
blk = off / blk_size; |
| 4171 |
blk_off = off % blk_size; |
| 4172 |
bytes = MIN(blk_size - blk_off, size); |
| 4173 |
|
| 4174 |
first_sec = blk_off >> VHD_SECTOR_SHIFT; |
| 4175 |
last_sec = secs_round_up_no_zero(blk_off + bytes); |
| 4176 |
|
| 4177 |
blk_start = ctx->bat.bat[blk]; |
| 4178 |
if (blk_start == DD_BLK_UNUSED) {
|
| 4179 |
err = __vhd_io_allocate_block(ctx, blk); |
| 4180 |
if (err)
|
| 4181 |
goto fail;
|
| 4182 |
|
| 4183 |
blk_start = ctx->bat.bat[blk]; |
| 4184 |
} |
| 4185 |
|
| 4186 |
blk_start = vhd_sectors_to_bytes(blk_start + ctx->bm_secs); |
| 4187 |
|
| 4188 |
err = vhd_pwrite(ctx, buf, bytes, blk_start + blk_off); |
| 4189 |
if (err)
|
| 4190 |
goto fail;
|
| 4191 |
|
| 4192 |
if (vhd_has_batmap(ctx) &&
|
| 4193 |
vhd_batmap_test(ctx, &ctx->batmap, blk)) |
| 4194 |
goto next;
|
| 4195 |
|
| 4196 |
err = vhd_read_bitmap(ctx, blk, &map); |
| 4197 |
if (err) {
|
| 4198 |
map = NULL;
|
| 4199 |
goto fail;
|
| 4200 |
} |
| 4201 |
|
| 4202 |
for (i = first_sec; i < last_sec; i++)
|
| 4203 |
vhd_bitmap_set(ctx, map, i); |
| 4204 |
|
| 4205 |
err = vhd_write_bitmap(ctx, blk, map); |
| 4206 |
if (err)
|
| 4207 |
goto fail;
|
| 4208 |
|
| 4209 |
if (vhd_has_batmap(ctx)) {
|
| 4210 |
for (i = 0; i < ctx->spb; i++) |
| 4211 |
if (!vhd_bitmap_test(ctx, map, i)) {
|
| 4212 |
free(map); |
| 4213 |
map = NULL;
|
| 4214 |
goto next;
|
| 4215 |
} |
| 4216 |
|
| 4217 |
vhd_batmap_set(ctx, &ctx->batmap, blk); |
| 4218 |
err = vhd_write_batmap(ctx, &ctx->batmap); |
| 4219 |
if (err)
|
| 4220 |
goto fail;
|
| 4221 |
} |
| 4222 |
|
| 4223 |
free(map); |
| 4224 |
map = NULL;
|
| 4225 |
|
| 4226 |
next:
|
| 4227 |
size -= bytes; |
| 4228 |
off += bytes; |
| 4229 |
buf += bytes; |
| 4230 |
|
| 4231 |
} while (size);
|
| 4232 |
|
| 4233 |
err = 0;
|
| 4234 |
|
| 4235 |
out:
|
| 4236 |
ret = vhd_write_footer(ctx, &ctx->footer); |
| 4237 |
return (err ? err : ret);
|
| 4238 |
|
| 4239 |
fail:
|
| 4240 |
free(map); |
| 4241 |
goto out;
|
| 4242 |
} |
| 4243 |
|
| 4244 |
static int |
| 4245 |
__vhd_io_dynamic_write_bytes(vhd_context_t *ctx, |
| 4246 |
char *buf, size_t size, uint64_t off)
|
| 4247 |
{
|
| 4248 |
int err;
|
| 4249 |
char *tmp;
|
| 4250 |
uint32_t first_sec, last_sec, first_sec_off, last_sec_off; |
| 4251 |
|
| 4252 |
err = 0;
|
| 4253 |
tmp = NULL;
|
| 4254 |
|
| 4255 |
first_sec = off >> VHD_SECTOR_SHIFT; |
| 4256 |
last_sec = secs_round_up_no_zero(off + size); |
| 4257 |
|
| 4258 |
first_sec_off = off & (VHD_SECTOR_SIZE - 1);
|
| 4259 |
last_sec_off = (off + size) & (VHD_SECTOR_SIZE - 1);
|
| 4260 |
|
| 4261 |
if (first_sec_off || last_sec_off) {
|
| 4262 |
tmp = malloc(VHD_SECTOR_SIZE); |
| 4263 |
if (!tmp) {
|
| 4264 |
err = -ENOMEM; |
| 4265 |
goto out;
|
| 4266 |
} |
| 4267 |
|
| 4268 |
if (first_sec_off) {
|
| 4269 |
uint32_t new = VHD_SECTOR_SIZE - first_sec_off; |
| 4270 |
if (new > size)
|
| 4271 |
new = size; |
| 4272 |
|
| 4273 |
err = vhd_io_read_bytes( |
| 4274 |
ctx, tmp, VHD_SECTOR_SIZE, |
| 4275 |
vhd_sectors_to_bytes(first_sec)); |
| 4276 |
if (err)
|
| 4277 |
goto out;
|
| 4278 |
|
| 4279 |
memcpy(tmp + first_sec_off, buf, new); |
| 4280 |
|
| 4281 |
err = __vhd_io_dynamic_write_bytes_aligned( |
| 4282 |
ctx, tmp, VHD_SECTOR_SIZE, |
| 4283 |
vhd_sectors_to_bytes(first_sec)); |
| 4284 |
if (err)
|
| 4285 |
goto out;
|
| 4286 |
|
| 4287 |
buf += new; |
| 4288 |
off += new; |
| 4289 |
size -= new; |
| 4290 |
} |
| 4291 |
|
| 4292 |
if (last_sec_off &&
|
| 4293 |
(last_sec - first_sec > 1 || !first_sec_off)) {
|
| 4294 |
uint32_t new = last_sec_off; |
| 4295 |
|
| 4296 |
err = vhd_io_read_bytes( |
| 4297 |
ctx, tmp, VHD_SECTOR_SIZE, |
| 4298 |
vhd_sectors_to_bytes(last_sec - 1));
|
| 4299 |
if (err)
|
| 4300 |
goto out;
|
| 4301 |
|
| 4302 |
memcpy(tmp, buf + size - new, new); |
| 4303 |
|
| 4304 |
err = __vhd_io_dynamic_write_bytes_aligned( |
| 4305 |
ctx, tmp, VHD_SECTOR_SIZE, |
| 4306 |
vhd_sectors_to_bytes(last_sec - 1));
|
| 4307 |
if (err)
|
| 4308 |
goto out;
|
| 4309 |
|
| 4310 |
size -= new; |
| 4311 |
} |
| 4312 |
} |
| 4313 |
|
| 4314 |
if (size)
|
| 4315 |
err = __vhd_io_dynamic_write_bytes_aligned(ctx, buf, size, off); |
| 4316 |
|
| 4317 |
out:
|
| 4318 |
free(tmp); |
| 4319 |
return err;
|
| 4320 |
} |
| 4321 |
|
| 4322 |
int
|
| 4323 |
vhd_io_write_bytes(vhd_context_t *ctx, void *buf, size_t size, uint64_t off)
|
| 4324 |
{
|
| 4325 |
if (off + size > ctx->footer.curr_size)
|
| 4326 |
return -ERANGE;
|
| 4327 |
|
| 4328 |
if (!vhd_type_dynamic(ctx))
|
| 4329 |
return vhd_pwrite(ctx, buf, size, off);
|
| 4330 |
|
| 4331 |
return __vhd_io_dynamic_write_bytes(ctx, buf, size, off);
|
| 4332 |
} |
| 4333 |
|
| 4334 |
int
|
| 4335 |
vhd_marker(vhd_context_t *ctx, char *marker)
|
| 4336 |
{
|
| 4337 |
int err;
|
| 4338 |
vhd_batmap_t batmap; |
| 4339 |
|
| 4340 |
*marker = 0;
|
| 4341 |
|
| 4342 |
if (!vhd_has_batmap(ctx))
|
| 4343 |
return -ENOSYS;
|
| 4344 |
|
| 4345 |
err = vhd_read_batmap_header(ctx, &batmap); |
| 4346 |
if (err)
|
| 4347 |
return err;
|
| 4348 |
|
| 4349 |
*marker = batmap.header.marker; |
| 4350 |
return 0; |
| 4351 |
} |
| 4352 |
|
| 4353 |
int
|
| 4354 |
vhd_set_marker(vhd_context_t *ctx, char marker)
|
| 4355 |
{
|
| 4356 |
int err;
|
| 4357 |
vhd_batmap_t batmap; |
| 4358 |
|
| 4359 |
if (!vhd_has_batmap(ctx))
|
| 4360 |
return -ENOSYS;
|
| 4361 |
|
| 4362 |
err = vhd_read_batmap_header(ctx, &batmap); |
| 4363 |
if (err)
|
| 4364 |
return err;
|
| 4365 |
|
| 4366 |
batmap.header.marker = marker; |
| 4367 |
return vhd_write_batmap_header(ctx, &batmap);
|
| 4368 |
} |