This patch adds a new option preallocation for raw format, and implements
full preallocation.
Signed-off-by: Hu Tao <hu...@cn.fujitsu.com>
---
block/raw-posix.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 19181f2..e09e170 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1199,11 +1199,22 @@ static int raw_create(const char *filename,
QEMUOptionParameter *options,
int fd;
int result = 0;
int64_t total_size = 0;
+ int prealloc = PREALLOC_OFF;
/* Read out options */
while (options && options->name) {
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
total_size = options->value.n / BDRV_SECTOR_SIZE;
+ } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) {
+ if (!options->value.s || !strcmp(options->value.s, "off")) {
+ prealloc = PREALLOC_OFF;
+ } else if (!strcmp(options->value.s, "full")) {
+ prealloc = PREALLOC_FULL;
+ } else {
+ error_setg(errp, "Invalid preallocation mode: '%s'",
+ options->value.s);
+ return -EINVAL;
+ }
}
options++;
}
@@ -1218,6 +1229,12 @@ static int raw_create(const char *filename,
QEMUOptionParameter *options,
result = -errno;
error_setg_errno(errp, -result, "Could not resize file");
}
+ if (prealloc == PREALLOC_FULL &&
+ raw_preallocate2(fd, 0, total_size * BDRV_SECTOR_SIZE) != 0) {
+ result = -errno;
+ error_setg_errno(errp, -result,
+ "Could not preallocate data for the new file");
+ }
if (qemu_close(fd) != 0) {
result = -errno;
error_setg_errno(errp, -result, "Could not close the new file");
@@ -1373,6 +1390,11 @@ static QEMUOptionParameter raw_create_options[] = {
.type = OPT_SIZE,
.help = "Virtual disk size"
},
+ {
+ .name = BLOCK_OPT_PREALLOC,
+ .type = OPT_STRING,
+ .help = "Preallocation mode (allowed values: off, full)"
+ },
{ NULL }
};
--
1.7.11.7
