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[Qemu-devel] [PATCH 2/4] block: image fragmentation statistics for qed
From: |
Dong Xu Wang |
Subject: |
[Qemu-devel] [PATCH 2/4] block: image fragmentation statistics for qed |
Date: |
Wed, 7 Mar 2012 17:22:57 +0800 |
From: Dong Xu Wang <address@hidden>
Add fragmentation statistics for qed file format.
Signed-off-by: Dong Xu Wang <address@hidden>
---
block/qed.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/block/qed.c b/block/qed.c
index a041d31..eb4dd90 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1444,6 +1444,46 @@ static int bdrv_qed_get_info(BlockDriverState *bs,
BlockDriverInfo *bdi)
return 0;
}
+static int bdrv_qed_get_fragment(BlockDriverState *bs, BlockFragInfo *bfi)
+{
+ BDRVQEDState *s = bs->opaque;
+ uint32_t cluster_size = s->header.cluster_size;
+ uint64_t table_noffsets = s->header.table_size * cluster_size /
sizeof(uint64_t);
+ uint64_t i, j;
+ uint64_t l2_offset;
+ int ret = 0;
+ uint64_t last_offset = 0;
+ uint64_t size = s->header.table_size * cluster_size;
+ uint64_t *table = qemu_blockalign(s->bs, size);
+
+ for (i = 0; i < table_noffsets; i++) {
+ l2_offset = s->l1_table->offsets[i];
+ if (l2_offset == 0) {
+ continue;
+ }
+ ret = bdrv_pread(bs->file, l2_offset, table, size);
+ if (ret < 0) {
+ qemu_vfree(table);
+ return ret;
+ }
+ for (j = 0; j < size/sizeof(uint64_t); j++) {
+ uint64_t *offset = (uint64_t *)(table + j);
+ if (*offset < cluster_size) {
+ continue;
+ }
+ bfi->allocated_clusters++;
+ if (last_offset && (last_offset + cluster_size) != *offset) {
+ bfi->fragmented_clusters++;
+ }
+ last_offset = *offset;
+ }
+ }
+ bfi->total_clusters = (s->header.image_size + s->header.cluster_size - 1) /
+ s->header.cluster_size;
+ qemu_vfree(table);
+ return ret;
+}
+
static int bdrv_qed_change_backing_file(BlockDriverState *bs,
const char *backing_file,
const char *backing_fmt)
@@ -1569,6 +1609,7 @@ static BlockDriver bdrv_qed = {
.bdrv_get_info = bdrv_qed_get_info,
.bdrv_change_backing_file = bdrv_qed_change_backing_file,
.bdrv_check = bdrv_qed_check,
+ .bdrv_get_fragment = bdrv_qed_get_fragment,
};
static void bdrv_qed_init(void)
--
1.7.5.4
Re: [Qemu-devel] [PATCH 1/4] block: add image fragmentation statistics to qemu-img, Stefan Hajnoczi, 2012/03/12