diff options
| -rw-r--r-- | block/file-posix.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/block/file-posix.c b/block/file-posix.c index 442f080eaa..d24e34be36 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1604,6 +1604,17 @@ static int raw_create(const char *filename, QemuOpts *opts, Error **errp) #endif case PREALLOC_MODE_FULL: { + /* + * Knowing the final size from the beginning could allow the file + * system driver to do less allocations and possibly avoid + * fragmentation of the file. + */ + if (ftruncate(fd, total_size) != 0) { + result = -errno; + error_setg_errno(errp, -result, "Could not resize file"); + goto out_close; + } + int64_t num = 0, left = total_size; buf = g_malloc0(65536); @@ -1642,6 +1653,7 @@ static int raw_create(const char *filename, QemuOpts *opts, Error **errp) break; } +out_close: if (qemu_close(fd) != 0 && result == 0) { result = -errno; error_setg_errno(errp, -result, "Could not close the new file"); |