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[Qemu-devel] [PATCH RFC v11 5/6] raw-posix: Add falloc and full prealloc
From: |
Hu Tao |
Subject: |
[Qemu-devel] [PATCH RFC v11 5/6] raw-posix: Add falloc and full preallocation option |
Date: |
Wed, 2 Jul 2014 16:17:32 +0800 |
This patch adds a new option preallocation for raw format, and implements
falloc and full preallocation.
Signed-off-by: Hu Tao <address@hidden>
---
block/raw-posix.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 55 insertions(+), 7 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 58c51d8..5dcd465 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -30,6 +30,7 @@
#include "block/thread-pool.h"
#include "qemu/iov.h"
#include "raw-aio.h"
+#include "qapi/util.h"
#if defined(__APPLE__) && (__MACH__)
#include <paths.h>
@@ -1278,28 +1279,70 @@ static int raw_create(const char *filename, QemuOpts
*opts, Error **errp)
int fd;
int result = 0;
int64_t total_size = 0;
+ PreallocMode prealloc = PREALLOC_MODE_OFF;
+ char *buf = NULL;
+ Error *local_err = NULL;
strstart(filename, "file:", &filename);
/* Read out options */
total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
BDRV_SECTOR_SIZE);
+ buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
+ prealloc = qapi_enum_parse(PreallocMode_lookup, buf,
+ PREALLOC_MODE_MAX, PREALLOC_MODE_OFF,
+ &local_err);
+ g_free(buf);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ result = -EINVAL;
+ goto out;
+ }
fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
0644);
if (fd < 0) {
result = -errno;
error_setg_errno(errp, -result, "Could not create file");
- } else {
- if (ftruncate(fd, total_size) != 0) {
- result = -errno;
- error_setg_errno(errp, -result, "Could not resize file");
+ goto out;
+ }
+ if (ftruncate(fd, total_size) != 0) {
+ result = -errno;
+ error_setg_errno(errp, -result, "Could not resize file");
+ goto out_close;
+ }
+ if (prealloc == PREALLOC_MODE_FALLOC) {
+ /* posix_fallocate() doesn't set errno. */
+ result = -posix_fallocate(fd, 0, total_size);
+ if (result != 0) {
+ 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");
+ } else if (prealloc == PREALLOC_MODE_FULL) {
+ buf = g_malloc0(65536);
+ int64_t num = 0, left = total_size;
+
+ while (left > 0) {
+ num = MIN(left, 65536);
+ result = write(fd, buf, num);
+ if (result < 0) {
+ result = -errno;
+ error_setg_errno(errp, -result,
+ "Could not write to the new file");
+ g_free(buf);
+ goto out_close;
+ }
+ left -= num;
}
+ fsync(fd);
+ g_free(buf);
+ }
+out_close:
+ if (qemu_close(fd) != 0 && result == 0) {
+ result = -errno;
+ error_setg_errno(errp, -result, "Could not close the new file");
}
+out:
return result;
}
@@ -1477,6 +1520,11 @@ static QemuOptsList raw_create_opts = {
.type = QEMU_OPT_SIZE,
.help = "Virtual disk size"
},
+ {
+ .name = BLOCK_OPT_PREALLOC,
+ .type = QEMU_OPT_STRING,
+ .help = "Preallocation mode (allowed values: off, falloc, full)"
+ },
{ /* end of list */ }
}
};
--
1.9.3
- [Qemu-devel] [PATCH RFC v11 0/6] qcow2, raw: add preallocation=full and preallocation=falloc, Hu Tao, 2014/07/02
- [Qemu-devel] [PATCH RFC v11 1/6] block: round up file size to nearest sector, Hu Tao, 2014/07/02
- [Qemu-devel] [PATCH RFC v11 2/6] raw, qcow2: don't convert file size to sector size, Hu Tao, 2014/07/02
- [Qemu-devel] [PATCH RFC v11 3/6] rename parse_enum_option to qapi_enum_parse and make it public, Hu Tao, 2014/07/02
- [Qemu-devel] [PATCH RFC v11 4/6] qapi: introduce PreallocMode and a new PreallocMode full., Hu Tao, 2014/07/02
- [Qemu-devel] [PATCH RFC v11 5/6] raw-posix: Add falloc and full preallocation option,
Hu Tao <=
- [Qemu-devel] [PATCH RFC v11 6/6] qcow2: Add falloc and full preallocation option, Hu Tao, 2014/07/02