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[PATCH v2 2/4] qcow2: Don't round the L1 table allocation up to the sect
From: |
Alberto Garcia |
Subject: |
[PATCH v2 2/4] qcow2: Don't round the L1 table allocation up to the sector size |
Date: |
Thu, 9 Jan 2020 20:13:00 +0100 |
The L1 table is read from disk using the byte-based bdrv_pread() and
is never accessed beyond its last element, so there's no need to
allocate more memory than that.
Signed-off-by: Alberto Garcia <address@hidden>
---
block/qcow2-cluster.c | 5 ++---
block/qcow2-refcount.c | 2 +-
block/qcow2-snapshot.c | 3 +--
block/qcow2.c | 2 +-
4 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 8982b7b762..932fc48919 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -124,12 +124,11 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t
min_size,
#endif
new_l1_size2 = sizeof(uint64_t) * new_l1_size;
- new_l1_table = qemu_try_blockalign(bs->file->bs,
- ROUND_UP(new_l1_size2, 512));
+ new_l1_table = qemu_try_blockalign(bs->file->bs, new_l1_size2);
if (new_l1_table == NULL) {
return -ENOMEM;
}
- memset(new_l1_table, 0, ROUND_UP(new_l1_size2, 512));
+ memset(new_l1_table, 0, new_l1_size2);
if (s->l1_size) {
memcpy(new_l1_table, s->l1_table, s->l1_size * sizeof(uint64_t));
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index f67ac6b2d8..c963bc8de1 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1262,7 +1262,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
* l1_table_offset when it is the current s->l1_table_offset! Be careful
* when changing this! */
if (l1_table_offset != s->l1_table_offset) {
- l1_table = g_try_malloc0(ROUND_UP(l1_size2, 512));
+ l1_table = g_try_malloc0(l1_size2);
if (l1_size2 && l1_table == NULL) {
ret = -ENOMEM;
goto fail;
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 5ab64da1ec..82c32d4c9b 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -1024,8 +1024,7 @@ int qcow2_snapshot_load_tmp(BlockDriverState *bs,
return ret;
}
new_l1_bytes = sn->l1_size * sizeof(uint64_t);
- new_l1_table = qemu_try_blockalign(bs->file->bs,
- ROUND_UP(new_l1_bytes, 512));
+ new_l1_table = qemu_try_blockalign(bs->file->bs, new_l1_bytes);
if (new_l1_table == NULL) {
return -ENOMEM;
}
diff --git a/block/qcow2.c b/block/qcow2.c
index 87ca2832f0..848a6c5182 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1499,7 +1499,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverState
*bs, QDict *options,
if (s->l1_size > 0) {
s->l1_table = qemu_try_blockalign(bs->file->bs,
- ROUND_UP(s->l1_size * sizeof(uint64_t), 512));
+ s->l1_size * sizeof(uint64_t));
if (s->l1_table == NULL) {
error_setg(errp, "Could not allocate L1 table");
ret = -ENOMEM;
--
2.20.1
- Re: [PATCH v2 1/4] qcow2: Require that the virtual size is a multiple of the sector size, (continued)
- [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Alberto Garcia, 2020/01/09
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Max Reitz, 2020/01/14
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Alberto Garcia, 2020/01/16
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Max Reitz, 2020/01/17
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Kevin Wolf, 2020/01/17
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Max Reitz, 2020/01/17
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Kevin Wolf, 2020/01/17
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Alberto Garcia, 2020/01/17
- Re: [PATCH v2 4/4] qcow2: Use BDRV_SECTOR_SIZE instead of the hardcoded value, Alberto Garcia, 2020/01/18
[PATCH v2 2/4] qcow2: Don't round the L1 table allocation up to the sector size,
Alberto Garcia <=