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Re: [Qemu-devel] [PATCH v3] qcow2: Replace align_offset() with ROUND_UP(
From: |
Alberto Garcia |
Subject: |
Re: [Qemu-devel] [PATCH v3] qcow2: Replace align_offset() with ROUND_UP() |
Date: |
Thu, 22 Feb 2018 14:40:34 +0100 |
User-agent: |
Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu) |
ping
On Thu 15 Feb 2018 02:10:08 PM CET, Alberto Garcia wrote:
> The align_offset() function is equivalent to the ROUND_UP() macro so
> there's no need to use the former. The ROUND_UP() name is also a bit
> more explicit.
>
> This patch uses ROUND_UP() instead of the slower QEMU_ALIGN_UP()
> because align_offset() already requires that the second parameter is a
> power of two.
>
> Signed-off-by: Alberto Garcia <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
> ---
> v3 is the same as v2, but rebased on top of the current master fixing
> a merge conflict.
> ---
> block/qcow2-bitmap.c | 4 ++--
> block/qcow2-cluster.c | 4 ++--
> block/qcow2-refcount.c | 4 ++--
> block/qcow2-snapshot.c | 10 +++++-----
> block/qcow2.c | 14 +++++++-------
> block/qcow2.h | 6 ------
> 6 files changed, 18 insertions(+), 24 deletions(-)
>
> diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
> index 4f6fd863ea..5127276f90 100644
> --- a/block/qcow2-bitmap.c
> +++ b/block/qcow2-bitmap.c
> @@ -413,8 +413,8 @@ static inline void
> bitmap_dir_entry_to_be(Qcow2BitmapDirEntry *entry)
>
> static inline int calc_dir_entry_size(size_t name_size, size_t
> extra_data_size)
> {
> - return align_offset(sizeof(Qcow2BitmapDirEntry) +
> - name_size + extra_data_size, 8);
> + int size = sizeof(Qcow2BitmapDirEntry) + name_size + extra_data_size;
> + return ROUND_UP(size, 8);
> }
>
> static inline int dir_entry_size(Qcow2BitmapDirEntry *entry)
> diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
> index e406b0f3b9..98908c4264 100644
> --- a/block/qcow2-cluster.c
> +++ b/block/qcow2-cluster.c
> @@ -126,11 +126,11 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t
> min_size,
>
> new_l1_size2 = sizeof(uint64_t) * new_l1_size;
> new_l1_table = qemu_try_blockalign(bs->file->bs,
> - align_offset(new_l1_size2, 512));
> + ROUND_UP(new_l1_size2, 512));
> if (new_l1_table == NULL) {
> return -ENOMEM;
> }
> - memset(new_l1_table, 0, align_offset(new_l1_size2, 512));
> + memset(new_l1_table, 0, ROUND_UP(new_l1_size2, 512));
>
> 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 d46b69d7f3..126cca3276 100644
> --- a/block/qcow2-refcount.c
> +++ b/block/qcow2-refcount.c
> @@ -1204,7 +1204,7 @@ 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(align_offset(l1_size2, 512));
> + l1_table = g_try_malloc0(ROUND_UP(l1_size2, 512));
> if (l1_size2 && l1_table == NULL) {
> ret = -ENOMEM;
> goto fail;
> @@ -2553,7 +2553,7 @@ int qcow2_check_metadata_overlap(BlockDriverState *bs,
> int ign, int64_t offset,
> }
>
> /* align range to test to cluster boundaries */
> - size = align_offset(offset_into_cluster(s, offset) + size,
> s->cluster_size);
> + size = ROUND_UP(offset_into_cluster(s, offset) + size, s->cluster_size);
> offset = start_of_cluster(s, offset);
>
> if ((chk & QCOW2_OL_ACTIVE_L1) && s->l1_size) {
> diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
> index 44243e0e95..cee25f582b 100644
> --- a/block/qcow2-snapshot.c
> +++ b/block/qcow2-snapshot.c
> @@ -66,7 +66,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
>
> for(i = 0; i < s->nb_snapshots; i++) {
> /* Read statically sized part of the snapshot header */
> - offset = align_offset(offset, 8);
> + offset = ROUND_UP(offset, 8);
> ret = bdrv_pread(bs->file, offset, &h, sizeof(h));
> if (ret < 0) {
> goto fail;
> @@ -155,7 +155,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
> offset = 0;
> for(i = 0; i < s->nb_snapshots; i++) {
> sn = s->snapshots + i;
> - offset = align_offset(offset, 8);
> + offset = ROUND_UP(offset, 8);
> offset += sizeof(h);
> offset += sizeof(extra);
> offset += strlen(sn->id_str);
> @@ -215,7 +215,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
> assert(id_str_size <= UINT16_MAX && name_size <= UINT16_MAX);
> h.id_str_size = cpu_to_be16(id_str_size);
> h.name_size = cpu_to_be16(name_size);
> - offset = align_offset(offset, 8);
> + offset = ROUND_UP(offset, 8);
>
> ret = bdrv_pwrite(bs->file, offset, &h, sizeof(h));
> if (ret < 0) {
> @@ -441,7 +441,7 @@ int qcow2_snapshot_create(BlockDriverState *bs,
> QEMUSnapshotInfo *sn_info)
> /* The VM state isn't needed any more in the active L1 table; in fact, it
> * hurts by causing expensive COW for the next snapshot. */
> qcow2_cluster_discard(bs, qcow2_vm_state_offset(s),
> - align_offset(sn->vm_state_size, s->cluster_size),
> + ROUND_UP(sn->vm_state_size, s->cluster_size),
> QCOW2_DISCARD_NEVER, false);
>
> #ifdef DEBUG_ALLOC
> @@ -710,7 +710,7 @@ int qcow2_snapshot_load_tmp(BlockDriverState *bs,
> }
> new_l1_bytes = sn->l1_size * sizeof(uint64_t);
> new_l1_table = qemu_try_blockalign(bs->file->bs,
> - align_offset(new_l1_bytes, 512));
> + ROUND_UP(new_l1_bytes, 512));
> if (new_l1_table == NULL) {
> return -ENOMEM;
> }
> diff --git a/block/qcow2.c b/block/qcow2.c
> index 57a517e2bd..2c6c33b67c 100644
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -1379,7 +1379,7 @@ static int qcow2_do_open(BlockDriverState *bs, QDict
> *options, int flags,
>
> if (s->l1_size > 0) {
> s->l1_table = qemu_try_blockalign(bs->file->bs,
> - align_offset(s->l1_size * sizeof(uint64_t), 512));
> + ROUND_UP(s->l1_size * sizeof(uint64_t), 512));
> if (s->l1_table == NULL) {
> error_setg(errp, "Could not allocate L1 table");
> ret = -ENOMEM;
> @@ -2640,19 +2640,19 @@ static int64_t qcow2_calc_prealloc_size(int64_t
> total_size,
> {
> int64_t meta_size = 0;
> uint64_t nl1e, nl2e;
> - int64_t aligned_total_size = align_offset(total_size, cluster_size);
> + int64_t aligned_total_size = ROUND_UP(total_size, cluster_size);
>
> /* header: 1 cluster */
> meta_size += cluster_size;
>
> /* total size of L2 tables */
> nl2e = aligned_total_size / cluster_size;
> - nl2e = align_offset(nl2e, cluster_size / sizeof(uint64_t));
> + nl2e = ROUND_UP(nl2e, cluster_size / sizeof(uint64_t));
> meta_size += nl2e * sizeof(uint64_t);
>
> /* total size of L1 tables */
> nl1e = nl2e * sizeof(uint64_t) / cluster_size;
> - nl1e = align_offset(nl1e, cluster_size / sizeof(uint64_t));
> + nl1e = ROUND_UP(nl1e, cluster_size / sizeof(uint64_t));
> meta_size += nl1e * sizeof(uint64_t);
>
> /* total size of refcount table and blocks */
> @@ -3706,8 +3706,8 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts,
> BlockDriverState *in_bs,
> has_backing_file = !!optstr;
> g_free(optstr);
>
> - virtual_size = align_offset(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE,
> 0),
> - cluster_size);
> + virtual_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
> + virtual_size = ROUND_UP(virtual_size, cluster_size);
>
> /* Check that virtual disk size is valid */
> l2_tables = DIV_ROUND_UP(virtual_size / cluster_size,
> @@ -3727,7 +3727,7 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts,
> BlockDriverState *in_bs,
> goto err;
> }
>
> - virtual_size = align_offset(ssize, cluster_size);
> + virtual_size = ROUND_UP(ssize, cluster_size);
>
> if (has_backing_file) {
> /* We don't how much of the backing chain is shared by the input
> diff --git a/block/qcow2.h b/block/qcow2.h
> index 883802241f..1a84cc77b0 100644
> --- a/block/qcow2.h
> +++ b/block/qcow2.h
> @@ -480,12 +480,6 @@ static inline int
> offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset)
> return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
> }
>
> -static inline int64_t align_offset(int64_t offset, int n)
> -{
> - offset = (offset + n - 1) & ~(n - 1);
> - return offset;
> -}
> -
> static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
> {
> return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
> --
> 2.11.0