2 * Block driver for Parallels disk image format
4 * Copyright (c) 2007 Alex Beregszaszi
5 * Copyright (c) 2015 Denis V. Lunev <den@openvz.org>
7 * This code was originally based on comparing different disk images created
8 * by Parallels. Currently it is based on opened OpenVZ sources
10 * http://git.openvz.org/?p=ploop;a=summary
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this software and associated documentation files (the "Software"), to deal
14 * in the Software without restriction, including without limitation the rights
15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
16 * copies of the Software, and to permit persons to whom the Software is
17 * furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
31 #include "qemu/osdep.h"
32 #include "qemu/error-report.h"
33 #include "qapi/error.h"
34 #include "block/block_int.h"
35 #include "block/qdict.h"
36 #include "sysemu/block-backend.h"
37 #include "qemu/module.h"
38 #include "qemu/option.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qobject-input-visitor.h"
41 #include "qapi/qapi-visit-block-core.h"
42 #include "qemu/bswap.h"
43 #include "qemu/bitmap.h"
44 #include "qemu/memalign.h"
45 #include "migration/blocker.h"
46 #include "parallels.h"
48 /**************************************************************/
50 #define HEADER_MAGIC "WithoutFreeSpace"
51 #define HEADER_MAGIC2 "WithouFreSpacExt"
52 #define HEADER_VERSION 2
53 #define HEADER_INUSE_MAGIC (0x746F6E59)
54 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
56 static QEnumLookup prealloc_mode_lookup = {
57 .array = (const char *const[]) {
61 .size = PRL_PREALLOC_MODE__MAX
64 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode"
65 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size"
67 static QemuOptsList parallels_runtime_opts = {
69 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
72 .name = PARALLELS_OPT_PREALLOC_SIZE,
73 .type = QEMU_OPT_SIZE,
74 .help = "Preallocation size on image expansion",
75 .def_value_str = "128M",
78 .name = PARALLELS_OPT_PREALLOC_MODE,
79 .type = QEMU_OPT_STRING,
80 .help = "Preallocation mode on image expansion "
81 "(allowed values: falloc, truncate)",
82 .def_value_str = "falloc",
84 { /* end of list */ },
88 static QemuOptsList parallels_create_opts = {
89 .name = "parallels-create-opts",
90 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
93 .name = BLOCK_OPT_SIZE,
94 .type = QEMU_OPT_SIZE,
95 .help = "Virtual disk size",
98 .name = BLOCK_OPT_CLUSTER_SIZE,
99 .type = QEMU_OPT_SIZE,
100 .help = "Parallels image cluster size",
101 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
103 { /* end of list */ }
108 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
110 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
113 static uint32_t bat_entry_off(uint32_t idx)
115 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
118 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
120 uint32_t index, offset;
122 index = sector_num / s->tracks;
123 offset = sector_num % s->tracks;
126 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
129 return bat2sect(s, index) + offset;
132 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
135 int ret = s->tracks - sector_num % s->tracks;
136 return MIN(nb_sectors, ret);
139 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
140 int nb_sectors, int *pnum)
142 int64_t start_off = -2, prev_end_off = -2;
145 while (nb_sectors > 0 || start_off == -2) {
146 int64_t offset = seek_to_sector(s, sector_num);
149 if (start_off == -2) {
151 prev_end_off = offset;
152 } else if (offset != prev_end_off) {
156 to_end = cluster_remainder(s, sector_num, nb_sectors);
157 nb_sectors -= to_end;
158 sector_num += to_end;
162 prev_end_off += to_end;
168 static void parallels_set_bat_entry(BDRVParallelsState *s,
169 uint32_t index, uint32_t offset)
171 s->bat_bitmap[index] = cpu_to_le32(offset);
172 bitmap_set(s->bat_dirty_bmap, bat_entry_off(index) / s->bat_dirty_block, 1);
175 static int64_t coroutine_fn GRAPH_RDLOCK
176 allocate_clusters(BlockDriverState *bs, int64_t sector_num,
177 int nb_sectors, int *pnum)
180 BDRVParallelsState *s = bs->opaque;
181 int64_t pos, space, idx, to_allocate, i, len;
183 pos = block_status(s, sector_num, nb_sectors, pnum);
188 idx = sector_num / s->tracks;
189 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx;
192 * This function is called only by parallels_co_writev(), which will never
193 * pass a sector_num at or beyond the end of the image (because the block
194 * layer never passes such a sector_num to that function). Therefore, idx
195 * is always below s->bat_size.
196 * block_status() will limit *pnum so that sector_num + *pnum will not
197 * exceed the image end. Therefore, idx + to_allocate cannot exceed
199 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate
200 * will always fit into a uint32_t.
202 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size);
204 space = to_allocate * s->tracks;
205 len = bdrv_co_getlength(bs->file->bs);
209 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) {
210 space += s->prealloc_size;
212 * We require the expanded size to read back as zero. If the
213 * user permitted truncation, we try that; but if it fails, we
214 * force the safer-but-slower fallocate.
216 if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) {
217 ret = bdrv_co_truncate(bs->file,
218 (s->data_end + space) << BDRV_SECTOR_BITS,
219 false, PREALLOC_MODE_OFF,
220 BDRV_REQ_ZERO_WRITE, NULL);
221 if (ret == -ENOTSUP) {
222 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
225 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
226 ret = bdrv_co_pwrite_zeroes(bs->file,
227 s->data_end << BDRV_SECTOR_BITS,
228 space << BDRV_SECTOR_BITS, 0);
236 * Try to read from backing to fill empty clusters
237 * FIXME: 1. previous write_zeroes may be redundant
238 * 2. most of data we read from backing will be rewritten by
239 * parallels_co_writev. On aligned-to-cluster write we do not need
241 * 3. it would be good to combine write of data from backing and new
242 * data into one write call.
245 int64_t nb_cow_sectors = to_allocate * s->tracks;
246 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS;
247 void *buf = qemu_blockalign(bs, nb_cow_bytes);
249 ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE,
250 nb_cow_bytes, buf, 0);
256 ret = bdrv_co_pwrite(bs->file, s->data_end * BDRV_SECTOR_SIZE,
257 nb_cow_bytes, buf, 0);
264 for (i = 0; i < to_allocate; i++) {
265 parallels_set_bat_entry(s, idx + i, s->data_end / s->off_multiplier);
266 s->data_end += s->tracks;
269 return bat2sect(s, idx) + sector_num % s->tracks;
273 static int coroutine_fn GRAPH_RDLOCK
274 parallels_co_flush_to_os(BlockDriverState *bs)
276 BDRVParallelsState *s = bs->opaque;
277 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
280 qemu_co_mutex_lock(&s->lock);
282 bit = find_first_bit(s->bat_dirty_bmap, size);
284 uint32_t off = bit * s->bat_dirty_block;
285 uint32_t to_write = s->bat_dirty_block;
288 if (off + to_write > s->header_size) {
289 to_write = s->header_size - off;
291 ret = bdrv_co_pwrite(bs->file, off, to_write,
292 (uint8_t *)s->header + off, 0);
294 qemu_co_mutex_unlock(&s->lock);
297 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
299 bitmap_zero(s->bat_dirty_bmap, size);
301 qemu_co_mutex_unlock(&s->lock);
306 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
312 BlockDriverState **file)
314 BDRVParallelsState *s = bs->opaque;
317 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
318 qemu_co_mutex_lock(&s->lock);
319 offset = block_status(s, offset >> BDRV_SECTOR_BITS,
320 bytes >> BDRV_SECTOR_BITS, &count);
321 qemu_co_mutex_unlock(&s->lock);
323 *pnum = count * BDRV_SECTOR_SIZE;
328 *map = offset * BDRV_SECTOR_SIZE;
329 *file = bs->file->bs;
330 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
333 static int coroutine_fn GRAPH_RDLOCK
334 parallels_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
335 QEMUIOVector *qiov, int flags)
337 BDRVParallelsState *s = bs->opaque;
338 uint64_t bytes_done = 0;
339 QEMUIOVector hd_qiov;
342 qemu_iovec_init(&hd_qiov, qiov->niov);
344 while (nb_sectors > 0) {
348 qemu_co_mutex_lock(&s->lock);
349 position = allocate_clusters(bs, sector_num, nb_sectors, &n);
350 qemu_co_mutex_unlock(&s->lock);
356 nbytes = n << BDRV_SECTOR_BITS;
358 qemu_iovec_reset(&hd_qiov);
359 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
361 ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes,
369 bytes_done += nbytes;
372 qemu_iovec_destroy(&hd_qiov);
376 static int coroutine_fn GRAPH_RDLOCK
377 parallels_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
380 BDRVParallelsState *s = bs->opaque;
381 uint64_t bytes_done = 0;
382 QEMUIOVector hd_qiov;
385 qemu_iovec_init(&hd_qiov, qiov->niov);
387 while (nb_sectors > 0) {
391 qemu_co_mutex_lock(&s->lock);
392 position = block_status(s, sector_num, nb_sectors, &n);
393 qemu_co_mutex_unlock(&s->lock);
395 nbytes = n << BDRV_SECTOR_BITS;
397 qemu_iovec_reset(&hd_qiov);
398 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
402 ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE,
403 nbytes, &hd_qiov, 0);
408 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes);
411 ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes,
420 bytes_done += nbytes;
423 qemu_iovec_destroy(&hd_qiov);
427 static void parallels_check_unclean(BlockDriverState *bs,
428 BdrvCheckResult *res,
431 BDRVParallelsState *s = bs->opaque;
433 if (!s->header_unclean) {
437 fprintf(stderr, "%s image was not closed correctly\n",
438 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
440 if (fix & BDRV_FIX_ERRORS) {
441 /* parallels_close will do the job right */
442 res->corruptions_fixed++;
443 s->header_unclean = false;
447 static int coroutine_fn GRAPH_RDLOCK
448 parallels_check_outside_image(BlockDriverState *bs, BdrvCheckResult *res,
451 BDRVParallelsState *s = bs->opaque;
453 int64_t off, high_off, size;
455 size = bdrv_co_getlength(bs->file->bs);
462 for (i = 0; i < s->bat_size; i++) {
463 off = bat2sect(s, i) << BDRV_SECTOR_BITS;
464 if (off + s->cluster_size > size) {
465 fprintf(stderr, "%s cluster %u is outside image\n",
466 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
468 if (fix & BDRV_FIX_ERRORS) {
469 parallels_set_bat_entry(s, i, 0);
470 res->corruptions_fixed++;
474 if (high_off < off) {
480 res->image_end_offset = s->data_end << BDRV_SECTOR_BITS;
482 res->image_end_offset = high_off + s->cluster_size;
483 s->data_end = res->image_end_offset >> BDRV_SECTOR_BITS;
489 static int coroutine_fn GRAPH_RDLOCK
490 parallels_check_leak(BlockDriverState *bs, BdrvCheckResult *res,
493 BDRVParallelsState *s = bs->opaque;
497 size = bdrv_getlength(bs->file->bs);
503 if (size > res->image_end_offset) {
505 count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size);
506 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
507 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
508 size - res->image_end_offset);
510 if (fix & BDRV_FIX_LEAKS) {
511 Error *local_err = NULL;
514 * In order to really repair the image, we must shrink it.
515 * That means we have to pass exact=true.
517 ret = bdrv_co_truncate(bs->file, res->image_end_offset, true,
518 PREALLOC_MODE_OFF, 0, &local_err);
520 error_report_err(local_err);
524 res->leaks_fixed += count;
531 static void parallels_collect_statistics(BlockDriverState *bs,
532 BdrvCheckResult *res,
535 BDRVParallelsState *s = bs->opaque;
536 int64_t off, prev_off;
539 res->bfi.total_clusters = s->bat_size;
540 res->bfi.compressed_clusters = 0; /* compression is not supported */
543 for (i = 0; i < s->bat_size; i++) {
544 off = bat2sect(s, i) << BDRV_SECTOR_BITS;
546 * If BDRV_FIX_ERRORS is not set, out-of-image BAT entries were not
547 * fixed. Skip not allocated and out-of-image BAT entries.
549 if (off == 0 || off + s->cluster_size > res->image_end_offset) {
554 if (prev_off != 0 && (prev_off + s->cluster_size) != off) {
555 res->bfi.fragmented_clusters++;
558 res->bfi.allocated_clusters++;
562 static int coroutine_fn GRAPH_RDLOCK
563 parallels_co_check(BlockDriverState *bs, BdrvCheckResult *res,
566 BDRVParallelsState *s = bs->opaque;
569 WITH_QEMU_LOCK_GUARD(&s->lock) {
570 parallels_check_unclean(bs, res, fix);
572 ret = parallels_check_outside_image(bs, res, fix);
577 ret = parallels_check_leak(bs, res, fix);
582 parallels_collect_statistics(bs, res, fix);
585 ret = bdrv_co_flush(bs);
594 static int coroutine_fn GRAPH_UNLOCKED
595 parallels_co_create(BlockdevCreateOptions* opts, Error **errp)
597 BlockdevCreateOptionsParallels *parallels_opts;
598 BlockDriverState *bs;
600 int64_t total_size, cl_size;
601 uint32_t bat_entries, bat_sectors;
602 ParallelsHeader header;
603 uint8_t tmp[BDRV_SECTOR_SIZE];
606 assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS);
607 parallels_opts = &opts->u.parallels;
610 total_size = parallels_opts->size;
612 if (parallels_opts->has_cluster_size) {
613 cl_size = parallels_opts->cluster_size;
615 cl_size = DEFAULT_CLUSTER_SIZE;
618 /* XXX What is the real limit here? This is an insanely large maximum. */
619 if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) {
620 error_setg(errp, "Cluster size is too large");
623 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
624 error_setg(errp, "Image size is too large for this cluster size");
628 if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) {
629 error_setg(errp, "Image size must be a multiple of 512 bytes");
633 if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) {
634 error_setg(errp, "Cluster size must be a multiple of 512 bytes");
638 /* Create BlockBackend to write to the image */
639 bs = bdrv_co_open_blockdev_ref(parallels_opts->file, errp);
644 blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL,
650 blk_set_allow_write_beyond_eof(blk, true);
652 /* Create image format */
653 bat_entries = DIV_ROUND_UP(total_size, cl_size);
654 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
655 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS;
657 memset(&header, 0, sizeof(header));
658 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
659 header.version = cpu_to_le32(HEADER_VERSION);
660 /* don't care much about geometry, it is not used on image level */
661 header.heads = cpu_to_le32(HEADS_NUMBER);
662 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE
663 / HEADS_NUMBER / SEC_IN_CYL);
664 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
665 header.bat_entries = cpu_to_le32(bat_entries);
666 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
667 header.data_off = cpu_to_le32(bat_sectors);
669 /* write all the data */
670 memset(tmp, 0, sizeof(tmp));
671 memcpy(tmp, &header, sizeof(header));
673 ret = blk_co_pwrite(blk, 0, BDRV_SECTOR_SIZE, tmp, 0);
677 ret = blk_co_pwrite_zeroes(blk, BDRV_SECTOR_SIZE,
678 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
690 error_setg_errno(errp, -ret, "Failed to create Parallels image");
694 static int coroutine_fn GRAPH_UNLOCKED
695 parallels_co_create_opts(BlockDriver *drv, const char *filename,
696 QemuOpts *opts, Error **errp)
698 BlockdevCreateOptions *create_options = NULL;
699 BlockDriverState *bs = NULL;
704 static const QDictRenames opt_renames[] = {
705 { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" },
709 /* Parse options and convert legacy syntax */
710 qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts,
713 if (!qdict_rename_keys(qdict, opt_renames, errp)) {
718 /* Create and open the file (protocol layer) */
719 ret = bdrv_co_create_file(filename, opts, errp);
724 bs = bdrv_co_open(filename, NULL, NULL,
725 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
731 /* Now get the QAPI type BlockdevCreateOptions */
732 qdict_put_str(qdict, "driver", "parallels");
733 qdict_put_str(qdict, "file", bs->node_name);
735 v = qobject_input_visitor_new_flat_confused(qdict, errp);
741 visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp);
743 if (!create_options) {
748 /* Silently round up sizes */
749 create_options->u.parallels.size =
750 ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE);
751 create_options->u.parallels.cluster_size =
752 ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE);
754 /* Create the Parallels image (format layer) */
755 ret = parallels_co_create(create_options, errp);
762 qobject_unref(qdict);
764 qapi_free_BlockdevCreateOptions(create_options);
769 static int parallels_probe(const uint8_t *buf, int buf_size,
770 const char *filename)
772 const ParallelsHeader *ph = (const void *)buf;
774 if (buf_size < sizeof(ParallelsHeader)) {
778 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
779 !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
780 (le32_to_cpu(ph->version) == HEADER_VERSION)) {
787 static int parallels_update_header(BlockDriverState *bs)
789 BDRVParallelsState *s = bs->opaque;
790 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
791 sizeof(ParallelsHeader));
793 if (size > s->header_size) {
794 size = s->header_size;
796 return bdrv_pwrite_sync(bs->file, 0, size, s->header, 0);
799 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
802 BDRVParallelsState *s = bs->opaque;
805 int64_t file_nb_sectors;
806 QemuOpts *opts = NULL;
807 Error *local_err = NULL;
810 ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
815 file_nb_sectors = bdrv_nb_sectors(bs->file->bs);
816 if (file_nb_sectors < 0) {
820 ret = bdrv_pread(bs->file, 0, sizeof(ph), &ph, 0);
825 bs->total_sectors = le64_to_cpu(ph.nb_sectors);
827 if (le32_to_cpu(ph.version) != HEADER_VERSION) {
830 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
831 s->off_multiplier = 1;
832 bs->total_sectors = 0xffffffff & bs->total_sectors;
833 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
834 s->off_multiplier = le32_to_cpu(ph.tracks);
839 s->tracks = le32_to_cpu(ph.tracks);
840 if (s->tracks == 0) {
841 error_setg(errp, "Invalid image: Zero sectors per track");
845 if (s->tracks > INT32_MAX/513) {
846 error_setg(errp, "Invalid image: Too big cluster");
850 s->cluster_size = s->tracks << BDRV_SECTOR_BITS;
852 s->bat_size = le32_to_cpu(ph.bat_entries);
853 if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
854 error_setg(errp, "Catalog too large");
859 size = bat_entry_off(s->bat_size);
860 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
861 s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
862 if (s->header == NULL) {
866 s->data_end = le32_to_cpu(ph.data_off);
867 if (s->data_end == 0) {
868 s->data_end = DIV_ROUND_UP(size, BDRV_SECTOR_SIZE);
870 if (s->data_end < (s->header_size >> BDRV_SECTOR_BITS)) {
872 * There is not enough unused space to fit to block align between BAT
873 * and actual data. We can't avoid read-modify-write...
875 s->header_size = size;
878 ret = bdrv_pread(bs->file, 0, s->header_size, s->header, 0);
882 s->bat_bitmap = (uint32_t *)(s->header + 1);
884 for (i = 0; i < s->bat_size; i++) {
885 int64_t off = bat2sect(s, i);
886 if (off >= file_nb_sectors) {
887 if (flags & BDRV_O_CHECK) {
890 error_setg(errp, "parallels: Offset %" PRIi64 " in BAT[%d] entry "
891 "is larger than file size (%" PRIi64 ")",
892 off << BDRV_SECTOR_BITS, i,
893 file_nb_sectors << BDRV_SECTOR_BITS);
897 if (off >= s->data_end) {
898 s->data_end = off + s->tracks;
902 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
903 /* Image was not closed correctly. The check is mandatory */
904 s->header_unclean = true;
905 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
906 error_setg(errp, "parallels: Image was not closed correctly; "
907 "cannot be opened read/write");
913 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp);
918 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
923 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
924 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
925 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
926 /* prealloc_mode can be downgraded later during allocate_clusters */
927 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf,
928 PRL_PREALLOC_MODE_FALLOCATE,
931 if (local_err != NULL) {
932 error_propagate(errp, local_err);
937 if (flags & BDRV_O_RDWR) {
939 * It's unsafe to open image RW if there is an extension (as we
940 * don't support it). But parallels driver in QEMU historically
941 * ignores the extension, so print warning and don't care.
943 warn_report("Format Extension ignored in RW mode");
945 ret = parallels_read_format_extension(
946 bs, le64_to_cpu(ph.ext_off) << BDRV_SECTOR_BITS, errp);
953 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) {
954 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
955 ret = parallels_update_header(bs);
961 s->bat_dirty_block = 4 * qemu_real_host_page_size();
963 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
965 /* Disable migration until bdrv_activate method is added */
966 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' "
967 "does not support live migration",
968 bdrv_get_device_or_node_name(bs));
969 ret = migrate_add_blocker(s->migration_blocker, errp);
971 error_free(s->migration_blocker);
974 qemu_co_mutex_init(&s->lock);
978 error_setg(errp, "Image not in Parallels format");
982 qemu_vfree(s->header);
987 static void parallels_close(BlockDriverState *bs)
989 BDRVParallelsState *s = bs->opaque;
991 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) {
992 s->header->inuse = 0;
993 parallels_update_header(bs);
995 /* errors are ignored, so we might as well pass exact=true */
996 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true,
997 PREALLOC_MODE_OFF, 0, NULL);
1000 g_free(s->bat_dirty_bmap);
1001 qemu_vfree(s->header);
1003 migrate_del_blocker(s->migration_blocker);
1004 error_free(s->migration_blocker);
1007 static BlockDriver bdrv_parallels = {
1008 .format_name = "parallels",
1009 .instance_size = sizeof(BDRVParallelsState),
1010 .bdrv_probe = parallels_probe,
1011 .bdrv_open = parallels_open,
1012 .bdrv_close = parallels_close,
1013 .bdrv_child_perm = bdrv_default_perms,
1014 .bdrv_co_block_status = parallels_co_block_status,
1015 .bdrv_has_zero_init = bdrv_has_zero_init_1,
1016 .bdrv_co_flush_to_os = parallels_co_flush_to_os,
1017 .bdrv_co_readv = parallels_co_readv,
1018 .bdrv_co_writev = parallels_co_writev,
1020 .supports_backing = true,
1021 .bdrv_co_create = parallels_co_create,
1022 .bdrv_co_create_opts = parallels_co_create_opts,
1023 .bdrv_co_check = parallels_co_check,
1024 .create_opts = ¶llels_create_opts,
1027 static void bdrv_parallels_init(void)
1029 bdrv_register(&bdrv_parallels);
1032 block_init(bdrv_parallels_init);