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[Qemu-devel] [PATCH 1/4] block: add image fragmentation statistics to qe
From: |
Dong Xu Wang |
Subject: |
[Qemu-devel] [PATCH 1/4] block: add image fragmentation statistics to qemu-img |
Date: |
Wed, 7 Mar 2012 17:22:56 +0800 |
From: Dong Xu Wang <address@hidden>
Discussion can be found at:
http://patchwork.ozlabs.org/patch/128730/
This patch add image fragmentation statistics while using qemu-img info.
Signed-off-by: Dong Xu Wang <address@hidden>
---
block.c | 13 +++++++++++++
block.h | 7 +++++++
block_int.h | 1 +
qemu-img.c | 9 +++++++++
4 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index 52ffe14..947607b 100644
--- a/block.c
+++ b/block.c
@@ -2588,6 +2588,19 @@ int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo
*bdi)
return drv->bdrv_get_info(bs, bdi);
}
+int bdrv_get_fragment(BlockDriverState *bs, BlockFragInfo *bfi)
+{
+ BlockDriver *drv = bs->drv;
+ if (!drv) {
+ return -ENOMEDIUM;
+ }
+ if (!drv->bdrv_get_fragment) {
+ return -ENOTSUP;
+ }
+ memset(bfi, 0, sizeof(*bfi));
+ return drv->bdrv_get_fragment(bs, bfi);
+}
+
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size)
{
diff --git a/block.h b/block.h
index 48d0bf3..d76d386 100644
--- a/block.h
+++ b/block.h
@@ -17,6 +17,12 @@ typedef struct BlockDriverInfo {
int64_t vm_state_offset;
} BlockDriverInfo;
+typedef struct BlockFragInfo {
+ uint64_t allocated_clusters;
+ uint64_t total_clusters;
+ uint64_t fragmented_clusters;
+} BlockFragInfo;
+
typedef struct QEMUSnapshotInfo {
char id_str[128]; /* unique snapshot id */
/* the following fields are informative. They are not needed for
@@ -290,6 +296,7 @@ const char *bdrv_get_device_name(BlockDriverState *bs);
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
+int bdrv_get_fragment(BlockDriverState *bs, BlockFragInfo *bfi);
const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
void bdrv_get_backing_filename(BlockDriverState *bs,
diff --git a/block_int.h b/block_int.h
index b460c36..339a5ac 100644
--- a/block_int.h
+++ b/block_int.h
@@ -179,6 +179,7 @@ struct BlockDriver {
int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
const char *snapshot_name);
int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
+ int (*bdrv_get_fragment)(BlockDriverState *bs, BlockFragInfo *bdi);
int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
int64_t pos, int size);
diff --git a/qemu-img.c b/qemu-img.c
index 8df3564..17731a9 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1075,6 +1075,7 @@ static int img_info(int argc, char **argv)
char backing_filename[1024];
char backing_filename2[1024];
BlockDriverInfo bdi;
+ BlockFragInfo bfi;
fmt = NULL;
for(;;) {
@@ -1126,6 +1127,14 @@ static int img_info(int argc, char **argv)
printf("cluster_size: %d\n", bdi.cluster_size);
}
}
+ if (bdrv_get_fragment(bs, &bfi) >= 0) {
+ if (bfi.total_clusters != 0 && bfi.allocated_clusters != 0) {
+ printf("%lld/%lld = %0.2f%% allocated, %0.2f%% fragmented\n",
+ bfi.allocated_clusters, bfi.total_clusters,
+ bfi.allocated_clusters * 100.0 / bfi.total_clusters,
+ bfi.fragmented_clusters * 100.0 / bfi.allocated_clusters);
+ }
+ }
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
if (backing_filename[0] != '\0') {
path_combine(backing_filename2, sizeof(backing_filename2),
--
1.7.5.4
- [Qemu-devel] [PATCH 1/4] block: add image fragmentation statistics to qemu-img,
Dong Xu Wang <=
Re: [Qemu-devel] [PATCH 1/4] block: add image fragmentation statistics to qemu-img, Stefan Hajnoczi, 2012/03/12