/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
#define BDRV_O_FLAGS BDRV_O_CACHE_WB
+#define BDRV_DEFAULT_CACHE "writeback"
static void format_print(void *opaque, const char *name)
{
"Command parameters:\n"
" 'filename' is a disk image filename\n"
" 'fmt' is the disk image format. It is guessed automatically in most cases\n"
+ " 'cache' is the cache mode used to write the output disk image, the valid\n"
+ " options are: 'none', 'writeback' (default), 'writethrough', 'directsync'\n"
+ " and 'unsafe'\n"
" 'size' is the disk image size in bytes. Optional suffixes\n"
" 'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
" and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
" rebasing in this case (useful for renaming the backing file)\n"
" '-h' with or without a command shows this help and lists the supported formats\n"
" '-p' show progress of command (only certain commands)\n"
+ " '-S' indicates the consecutive number of bytes that must contain only zeros\n"
+ " for qemu-img to create a sparse image during conversion\n"
"\n"
"Parameters to snapshot subcommand:\n"
" 'snapshot' is the name of the snapshot to create, apply or delete\n"
static int img_commit(int argc, char **argv)
{
- int c, ret;
- const char *filename, *fmt;
+ int c, ret, flags;
+ const char *filename, *fmt, *cache;
BlockDriverState *bs;
fmt = NULL;
+ cache = BDRV_DEFAULT_CACHE;
for(;;) {
- c = getopt(argc, argv, "f:h");
+ c = getopt(argc, argv, "f:ht:");
if (c == -1) {
break;
}
case 'f':
fmt = optarg;
break;
+ case 't':
+ cache = optarg;
+ break;
}
}
if (optind >= argc) {
}
filename = argv[optind++];
- bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
+ flags = BDRV_O_RDWR;
+ ret = bdrv_parse_cache_flags(cache, &flags);
+ if (ret < 0) {
+ error_report("Invalid cache option: %s", cache);
+ return -1;
+ }
+
+ bs = bdrv_new_open(filename, fmt, flags);
if (!bs) {
return 1;
}
return v;
}
+/*
+ * Like is_allocated_sectors, but if the buffer starts with a used sector,
+ * up to 'min' consecutive sectors containing zeros are ignored. This avoids
+ * breaking up write requests for only small sparse areas.
+ */
+static int is_allocated_sectors_min(const uint8_t *buf, int n, int *pnum,
+ int min)
+{
+ int ret;
+ int num_checked, num_used;
+
+ if (n < min) {
+ min = n;
+ }
+
+ ret = is_allocated_sectors(buf, n, pnum);
+ if (!ret) {
+ return ret;
+ }
+
+ num_used = *pnum;
+ buf += BDRV_SECTOR_SIZE * *pnum;
+ n -= *pnum;
+ num_checked = num_used;
+
+ while (n > 0) {
+ ret = is_allocated_sectors(buf, n, pnum);
+
+ buf += BDRV_SECTOR_SIZE * *pnum;
+ n -= *pnum;
+ num_checked += *pnum;
+ if (ret) {
+ num_used = num_checked;
+ } else if (*pnum >= min) {
+ break;
+ }
+ }
+
+ *pnum = num_used;
+ return 1;
+}
+
/*
* Compares two buffers sector by sector. Returns 0 if the first sector of both
* buffers matches, non-zero otherwise.
static int img_convert(int argc, char **argv)
{
int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors;
- int progress = 0;
- const char *fmt, *out_fmt, *out_baseimg, *out_filename;
+ int progress = 0, flags;
+ const char *fmt, *out_fmt, *cache, *out_baseimg, *out_filename;
BlockDriver *drv, *proto_drv;
BlockDriverState **bs = NULL, *out_bs = NULL;
int64_t total_sectors, nb_sectors, sector_num, bs_offset;
char *options = NULL;
const char *snapshot_name = NULL;
float local_progress;
+ int min_sparse = 8; /* Need at least 4k of zeros for sparse detection */
fmt = NULL;
out_fmt = "raw";
+ cache = "unsafe";
out_baseimg = NULL;
compress = 0;
for(;;) {
- c = getopt(argc, argv, "f:O:B:s:hce6o:p");
+ c = getopt(argc, argv, "f:O:B:s:hce6o:pS:t:");
if (c == -1) {
break;
}
case 's':
snapshot_name = optarg;
break;
+ case 'S':
+ {
+ int64_t sval;
+ sval = strtosz_suffix(optarg, NULL, STRTOSZ_DEFSUFFIX_B);
+ if (sval < 0) {
+ error_report("Invalid minimum zero buffer size for sparse output specified");
+ return 1;
+ }
+
+ min_sparse = sval / BDRV_SECTOR_SIZE;
+ break;
+ }
case 'p':
progress = 1;
break;
+ case 't':
+ cache = optarg;
+ break;
}
}
qemu_progress_init(progress, 2.0);
qemu_progress_print(0, 100);
- bs = qemu_mallocz(bs_n * sizeof(BlockDriverState *));
+ bs = g_malloc0(bs_n * sizeof(BlockDriverState *));
total_sectors = 0;
for (bs_i = 0; bs_i < bs_n; bs_i++) {
if (compress) {
QEMUOptionParameter *encryption =
get_option_parameter(param, BLOCK_OPT_ENCRYPT);
+ QEMUOptionParameter *preallocation =
+ get_option_parameter(param, BLOCK_OPT_PREALLOC);
if (!drv->bdrv_write_compressed) {
error_report("Compression not supported for this file format");
ret = -1;
goto out;
}
+
+ if (preallocation && preallocation->value.s
+ && strcmp(preallocation->value.s, "off"))
+ {
+ error_report("Compression and preallocation not supported at "
+ "the same time");
+ ret = -1;
+ goto out;
+ }
}
/* Create the new image */
goto out;
}
- out_bs = bdrv_new_open(out_filename, out_fmt,
- BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH);
+ flags = BDRV_O_RDWR;
+ ret = bdrv_parse_cache_flags(cache, &flags);
+ if (ret < 0) {
+ error_report("Invalid cache option: %s", cache);
+ return -1;
+ }
+
+ out_bs = bdrv_new_open(out_filename, out_fmt, flags);
if (!out_bs) {
ret = -1;
goto out;
bs_i = 0;
bs_offset = 0;
bdrv_get_geometry(bs[0], &bs_sectors);
- buf = qemu_malloc(IO_BUF_SIZE);
+ buf = qemu_blockalign(out_bs, IO_BUF_SIZE);
if (compress) {
ret = bdrv_get_info(out_bs, &bdi);
ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow);
if (ret < 0) {
- error_report("error while reading");
+ error_report("error while reading sector %" PRId64 ": %s",
+ bs_num, strerror(-ret));
goto out;
}
ret = bdrv_write_compressed(out_bs, sector_num, buf,
cluster_sectors);
if (ret != 0) {
- error_report("error while compressing sector %" PRId64,
- sector_num);
+ error_report("error while compressing sector %" PRId64
+ ": %s", sector_num, strerror(-ret));
goto out;
}
}
ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n);
if (ret < 0) {
- error_report("error while reading");
+ error_report("error while reading sector %" PRId64 ": %s",
+ sector_num - bs_offset, strerror(-ret));
goto out;
}
/* NOTE: at the same time we convert, we do not write zero
sectors that are entirely 0, since whatever data was
already there is garbage, not 0s. */
if (!has_zero_init || out_baseimg ||
- is_allocated_sectors(buf1, n, &n1)) {
+ is_allocated_sectors_min(buf1, n, &n1, min_sparse)) {
ret = bdrv_write(out_bs, sector_num, buf1, n1);
if (ret < 0) {
- error_report("error while writing");
+ error_report("error while writing sector %" PRId64
+ ": %s", sector_num, strerror(-ret));
goto out;
}
}
qemu_progress_end();
free_option_parameters(create_options);
free_option_parameters(param);
- qemu_free(buf);
+ qemu_vfree(buf);
if (out_bs) {
bdrv_delete(out_bs);
}
bdrv_delete(bs[bs_i]);
}
}
- qemu_free(bs);
+ g_free(bs);
}
if (ret) {
return 1;
return 0;
}
-#ifdef _WIN32
-static int64_t get_allocated_file_size(const char *filename)
-{
- typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
- get_compressed_t get_compressed;
- struct _stati64 st;
-
- /* WinNT support GetCompressedFileSize to determine allocate size */
- get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
- if (get_compressed) {
- DWORD high, low;
- low = get_compressed(filename, &high);
- if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
- return (((int64_t) high) << 32) + low;
- }
-
- if (_stati64(filename, &st) < 0)
- return -1;
- return st.st_size;
-}
-#else
-static int64_t get_allocated_file_size(const char *filename)
-{
- struct stat st;
- if (stat(filename, &st) < 0)
- return -1;
- return (int64_t)st.st_blocks * 512;
-}
-#endif
static void dump_snapshots(BlockDriverState *bs)
{
sn = &sn_tab[i];
printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
}
- qemu_free(sn_tab);
+ g_free(sn_tab);
}
static int img_info(int argc, char **argv)
bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
bdrv_get_geometry(bs, &total_sectors);
get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
- allocated_size = get_allocated_file_size(filename);
+ allocated_size = bdrv_get_allocated_file_size(bs);
if (allocated_size < 0) {
snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
} else {
BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL;
BlockDriver *old_backing_drv, *new_backing_drv;
char *filename;
- const char *fmt, *out_basefmt, *out_baseimg;
+ const char *fmt, *cache, *out_basefmt, *out_baseimg;
int c, flags, ret;
int unsafe = 0;
int progress = 0;
/* Parse commandline parameters */
fmt = NULL;
+ cache = BDRV_DEFAULT_CACHE;
out_baseimg = NULL;
out_basefmt = NULL;
-
for(;;) {
- c = getopt(argc, argv, "uhf:F:b:p");
+ c = getopt(argc, argv, "uhf:F:b:pt:");
if (c == -1) {
break;
}
case 'p':
progress = 1;
break;
+ case 't':
+ cache = optarg;
+ break;
}
}
qemu_progress_init(progress, 2.0);
qemu_progress_print(0, 100);
+ flags = BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
+ ret = bdrv_parse_cache_flags(cache, &flags);
+ if (ret < 0) {
+ error_report("Invalid cache option: %s", cache);
+ return -1;
+ }
+
/*
* Open the images.
*
* Ignore the old backing file for unsafe rebase in case we want to correct
* the reference to a renamed or moved backing file.
*/
- flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
bs = bdrv_new_open(filename, fmt, flags);
if (!bs) {
return 1;
uint8_t * buf_new;
float local_progress;
- buf_old = qemu_malloc(IO_BUF_SIZE);
- buf_new = qemu_malloc(IO_BUF_SIZE);
+ buf_old = qemu_blockalign(bs, IO_BUF_SIZE);
+ buf_new = qemu_blockalign(bs, IO_BUF_SIZE);
bdrv_get_geometry(bs, &num_sectors);
qemu_progress_print(local_progress, 100);
}
- qemu_free(buf_old);
- qemu_free(buf_new);
+ qemu_vfree(buf_old);
+ qemu_vfree(buf_new);
}
/*
projects / qemu.git / blobdiff