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block/block-copy: introduce block_copy_set_copy_opts()

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We'll need a possibility to set compress and use_copy_range options
after initialization of the state. So make corresponding part of
block_copy_state_new() separate and public.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210824083856.17408-8-vsementsov@virtuozzo.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-08-24 11:38:29 +03:00 committed by Hanna Reitz
parent 49577723d4
commit f8b9504bac
2 changed files with 32 additions and 20 deletions
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49
block/block-copy.c
View file

@ -315,6 +315,33 @@ static uint32_t block_copy_max_transfer(BdrvChild *source, BdrvChild *target)
target->bs->bl.max_transfer));
}
void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
bool compress)
{
/* Keep BDRV_REQ_SERIALISING set (or not set) in block_copy_state_new() */
s->write_flags = (s->write_flags & BDRV_REQ_SERIALISING) |
(compress ? BDRV_REQ_WRITE_COMPRESSED : 0);
if (s->max_transfer < s->cluster_size) {
/*
* copy_range does not respect max_transfer. We don't want to bother
* with requests smaller than block-copy cluster size, so fallback to
* buffered copying (read and write respect max_transfer on their
* behalf).
*/
s->method = COPY_READ_WRITE_CLUSTER;
} else if (compress) {
/* Compression supports only cluster-size writes and no copy-range. */
s->method = COPY_READ_WRITE_CLUSTER;
} else {
/*
* If copy range enabled, start with COPY_RANGE_SMALL, until first
* successful copy_range (look at block_copy_do_copy).
*/
s->method = use_copy_range ? COPY_RANGE_SMALL : COPY_READ_WRITE;
}
}
BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size, bool use_copy_range,
bool compress, Error **errp)
@ -353,32 +380,14 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
.copy_bitmap = copy_bitmap,
.cluster_size = cluster_size,
.len = bdrv_dirty_bitmap_size(copy_bitmap),
.write_flags = (is_fleecing ? BDRV_REQ_SERIALISING : 0) |
(compress ? BDRV_REQ_WRITE_COMPRESSED : 0),
.write_flags = (is_fleecing ? BDRV_REQ_SERIALISING : 0),
.mem = shres_create(BLOCK_COPY_MAX_MEM),
.max_transfer = QEMU_ALIGN_DOWN(
block_copy_max_transfer(source, target),
cluster_size),
};
if (s->max_transfer < cluster_size) {
/*
* copy_range does not respect max_transfer. We don't want to bother
* with requests smaller than block-copy cluster size, so fallback to
* buffered copying (read and write respect max_transfer on their
* behalf).
*/
s->method = COPY_READ_WRITE_CLUSTER;
} else if (compress) {
/* Compression supports only cluster-size writes and no copy-range. */
s->method = COPY_READ_WRITE_CLUSTER;
} else {
/*
* If copy range enabled, start with COPY_RANGE_SMALL, until first
* successful copy_range (look at block_copy_do_copy).
*/
s->method = use_copy_range ? COPY_RANGE_SMALL : COPY_READ_WRITE;
}
block_copy_set_copy_opts(s, use_copy_range, compress);
ratelimit_init(&s->rate_limit);
qemu_co_mutex_init(&s->lock);

3
include/block/block-copy.h
View file

@ -28,6 +28,9 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
int64_t cluster_size, bool use_copy_range,
bool compress, Error **errp);
/* Function should be called prior any actual copy request */
void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
bool compress);
void block_copy_set_progress_meter(BlockCopyState *s, ProgressMeter *pm);
void block_copy_state_free(BlockCopyState *s);