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qed: Remove callback from qed_copy_from_backing_file()

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With this change, qed_aio_write_prefill() and qed_aio_write_postfill()
collapse into a single function. This is reflected by a rename of the
combined function to qed_aio_write_cow().

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-11-15 11:14:01 +01:00
parent 0f7aa24d2c
commit b4ac32f34f
1 changed files with 23 additions and 34 deletions
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57
block/qed.c
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@ -861,13 +861,9 @@ static int qed_read_backing_file(BDRVQEDState *s, uint64_t pos,
* @pos: Byte position in device
* @len: Number of bytes
* @offset: Byte offset in image file
* @cb: Completion function
* @opaque: User data for completion function
*/
static void qed_copy_from_backing_file(BDRVQEDState *s, uint64_t pos,
uint64_t len, uint64_t offset,
BlockCompletionFunc *cb,
void *opaque)
static int qed_copy_from_backing_file(BDRVQEDState *s, uint64_t pos,
uint64_t len, uint64_t offset)
{
QEMUIOVector qiov;
QEMUIOVector *backing_qiov = NULL;
@ -876,8 +872,7 @@ static void qed_copy_from_backing_file(BDRVQEDState *s, uint64_t pos,
/* Skip copy entirely if there is no work to do */
if (len == 0) {
cb(opaque, 0);
return;
return 0;
}
iov = (struct iovec) {
@ -906,7 +901,7 @@ static void qed_copy_from_backing_file(BDRVQEDState *s, uint64_t pos,
ret = 0;
out:
qemu_vfree(iov.iov_base);
cb(opaque, ret);
return ret;
}
/**
@ -1133,42 +1128,36 @@ static void qed_aio_write_main(void *opaque, int ret)
}
/**
* Populate back untouched region of new data cluster
* Populate untouched regions of new data cluster
*/
static void qed_aio_write_postfill(void *opaque, int ret)
static void qed_aio_write_cow(void *opaque, int ret)
{
QEDAIOCB *acb = opaque;
BDRVQEDState *s = acb_to_s(acb);
uint64_t start = acb->cur_pos + acb->cur_qiov.size;
uint64_t len =
qed_start_of_cluster(s, start + s->header.cluster_size - 1) - start;
uint64_t offset = acb->cur_cluster +
qed_offset_into_cluster(s, acb->cur_pos) +
acb->cur_qiov.size;
uint64_t start, len, offset;
/* Populate front untouched region of new data cluster */
start = qed_start_of_cluster(s, acb->cur_pos);
len = qed_offset_into_cluster(s, acb->cur_pos);
trace_qed_aio_write_prefill(s, acb, start, len, acb->cur_cluster);
ret = qed_copy_from_backing_file(s, start, len, acb->cur_cluster);
if (ret) {
qed_aio_complete(acb, ret);
return;
}
/* Populate back untouched region of new data cluster */
start = acb->cur_pos + acb->cur_qiov.size;
len = qed_start_of_cluster(s, start + s->header.cluster_size - 1) - start;
offset = acb->cur_cluster +
qed_offset_into_cluster(s, acb->cur_pos) +
acb->cur_qiov.size;
trace_qed_aio_write_postfill(s, acb, start, len, offset);
qed_copy_from_backing_file(s, start, len, offset,
qed_aio_write_main, acb);
}
ret = qed_copy_from_backing_file(s, start, len, offset);
/**
* Populate front untouched region of new data cluster
*/
static void qed_aio_write_prefill(void *opaque, int ret)
{
QEDAIOCB *acb = opaque;
BDRVQEDState *s = acb_to_s(acb);
uint64_t start = qed_start_of_cluster(s, acb->cur_pos);
uint64_t len = qed_offset_into_cluster(s, acb->cur_pos);
trace_qed_aio_write_prefill(s, acb, start, len, acb->cur_cluster);
qed_copy_from_backing_file(s, start, len, acb->cur_cluster,
qed_aio_write_postfill, acb);
qed_aio_write_main(acb, ret);
}
/**
@ -1236,7 +1225,7 @@ static void qed_aio_write_alloc(QEDAIOCB *acb, size_t len)
cb = qed_aio_write_zero_cluster;
} else {
cb = qed_aio_write_prefill;
cb = qed_aio_write_cow;
acb->cur_cluster = qed_alloc_clusters(s, acb->cur_nclusters);
}