[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 10/21] qcow2: handle_alloc(): Get rid of keep_clu
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH v2 10/21] qcow2: handle_alloc(): Get rid of keep_clusters parameter |
Date: |
Tue, 26 Mar 2013 17:50:02 +0100 |
handle_alloc() is now called with the offset at which the actual new
allocation starts instead of the offset at which the whole write request
starts, part of which may already be processed.
Signed-off-by: Kevin Wolf <address@hidden>
---
block/qcow2-cluster.c | 44 +++++++++++++++++++++++++++-----------------
block/qcow2.h | 5 +++++
2 files changed, 32 insertions(+), 17 deletions(-)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 009f62a..8f4ef0d 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -876,12 +876,12 @@ static int do_alloc_cluster_offset(BlockDriverState *bs,
uint64_t guest_offset,
*
* -errno: in error cases
*
- * TODO Get rid of keep_clusters, n_start, n_end
+ * TODO Get rid of n_start, n_end
* TODO Make *bytes actually behave as specified above
*/
static int handle_alloc(BlockDriverState *bs, uint64_t guest_offset,
uint64_t *host_offset, uint64_t *bytes, QCowL2Meta **m,
- int keep_clusters, int n_start, int n_end)
+ int n_start, int n_end)
{
BDRVQcowState *s = bs->opaque;
int l2_index;
@@ -892,7 +892,6 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
uint64_t alloc_offset;
uint64_t alloc_cluster_offset;
- uint64_t keep_bytes = keep_clusters * s->cluster_size;
trace_qcow2_handle_alloc(qemu_coroutine_self(), guest_offset, *host_offset,
*bytes);
@@ -911,14 +910,13 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
return ret;
}
- entry = be64_to_cpu(l2_table[l2_index + keep_clusters]);
+ entry = be64_to_cpu(l2_table[l2_index]);
/* For the moment, overwrite compressed clusters one by one */
if (entry & QCOW_OFLAG_COMPRESSED) {
nb_clusters = 1;
} else {
- nb_clusters = count_cow_clusters(s, nb_clusters, l2_table,
- l2_index + keep_clusters);
+ nb_clusters = count_cow_clusters(s, nb_clusters, l2_table, l2_index);
}
ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
@@ -932,13 +930,8 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
}
/* Calculate start and size of allocation */
- alloc_offset = guest_offset + keep_bytes;
-
- if (keep_clusters == 0) {
- alloc_cluster_offset = 0;
- } else {
- alloc_cluster_offset = *host_offset + keep_bytes;
- }
+ alloc_offset = guest_offset;
+ alloc_cluster_offset = *host_offset;
/* Allocate, if necessary at a given offset in the image file */
ret = do_alloc_cluster_offset(bs, alloc_offset, &alloc_cluster_offset,
@@ -961,13 +954,13 @@ static int handle_alloc(BlockDriverState *bs, uint64_t
guest_offset,
* newly allocated cluster to the end of the aread that the write
* request actually writes to (excluding COW at the end)
*/
- int requested_sectors = n_end - keep_clusters * s->cluster_sectors;
+ int requested_sectors = n_end;
int avail_sectors = nb_clusters
<< (s->cluster_bits - BDRV_SECTOR_BITS);
- int alloc_n_start = keep_clusters == 0 ? n_start : 0;
+ int alloc_n_start = *host_offset == 0 ? n_start : 0;
int nb_sectors = MIN(requested_sectors, avail_sectors);
- if (keep_clusters == 0) {
+ if (*host_offset == 0) {
*host_offset = alloc_cluster_offset;
}
@@ -1130,9 +1123,26 @@ again:
goto done;
}
+ int alloc_n_start;
+ int alloc_n_end;
+
+ if (keep_clusters != 0) {
+ offset = start_of_cluster(s, offset
+ + keep_clusters *
s->cluster_size);
+ cluster_offset = start_of_cluster(s, cluster_offset
+ + keep_clusters *
s->cluster_size);
+
+ alloc_n_start = 0;
+ alloc_n_end = n_end - keep_clusters * s->cluster_sectors;
+ } else {
+ alloc_n_start = n_start;
+ alloc_n_end = n_end;
+ }
+
cur_bytes = nb_clusters * s->cluster_size;
+
ret = handle_alloc(bs, offset, &cluster_offset, &cur_bytes, m,
- keep_clusters, n_start, n_end);
+ alloc_n_start, alloc_n_end);
if (ret < 0) {
return ret;
}
diff --git a/block/qcow2.h b/block/qcow2.h
index a99d51b..c4eaf67 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -266,6 +266,11 @@ enum {
#define REFT_OFFSET_MASK 0xffffffffffffff00ULL
+static inline int64_t start_of_cluster(BDRVQcowState *s, int64_t offset)
+{
+ return offset & ~(s->cluster_size - 1);
+}
+
static inline int size_to_clusters(BDRVQcowState *s, int64_t size)
{
return (size + (s->cluster_size - 1)) >> s->cluster_bits;
--
1.8.1.4
- [Qemu-devel] [PATCH v2 00/21] qcow2: Rework cluster allocation even more, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 02/21] qcow2: Fix "total clusters" number in bdrv_check, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 01/21] qemu-iotests: More concurrent allocation scenarios, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 04/21] qcow2: Handle dependencies earlier, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 03/21] qcow2: Remove bogus unlock of s->lock, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 06/21] qcow2: Change handle_dependency to byte granularity, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 08/21] qcow2: Factor out handle_alloc(), Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 07/21] qcow2: Decouple cluster allocation from cluster reuse code, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 05/21] qcow2: Improve check for overlapping allocations, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 09/21] qcow2: handle_alloc(): Get rid of nb_clusters parameter, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 10/21] qcow2: handle_alloc(): Get rid of keep_clusters parameter,
Kevin Wolf <=
- [Qemu-devel] [PATCH v2 12/21] qcow2: Clean up handle_alloc(), Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 15/21] qcow2: handle_copied(): Get rid of keep_clusters parameter, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 13/21] qcow2: Factor out handle_copied(), Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 14/21] qcow2: handle_copied(): Get rid of nb_clusters parameter, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 16/21] qcow2: handle_copied(): Implement non-zero host_offset, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 17/21] qcow2: Prepare handle_alloc/copied() for byte granularity, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 11/21] qcow2: Finalise interface of handle_alloc(), Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 18/21] qcow2: Use byte granularity in qcow2_alloc_cluster_offset(), Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 19/21] qcow2: Allow requests with multiple l2metas, Kevin Wolf, 2013/03/26
- [Qemu-devel] [PATCH v2 21/21] qcow2: Gather clusters in a looping loop, Kevin Wolf, 2013/03/26