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qcow: move some blocks of code to avoid useless variable initialization 

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Frediano Ziglio 2011-08-23 15:21:10 +02:00 committed by Kevin Wolf
parent 430bbaaa95
commit 43ca85b559
1 changed files with 26 additions and 27 deletions
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53
block/qcow.c
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@ -522,35 +522,18 @@ static int qcow_aio_read_cb(QCowAIOCB *acb)
BlockDriverState *bs = acb->bs; BlockDriverState *bs = acb->bs;
BDRVQcowState *s = bs->opaque; BDRVQcowState *s = bs->opaque;
int index_in_cluster; int index_in_cluster;
int ret, n = 0; int ret, n;
uint64_t cluster_offset = 0; uint64_t cluster_offset;
struct iovec hd_iov; struct iovec hd_iov;
QEMUIOVector hd_qiov; QEMUIOVector hd_qiov;
redo: redo:
/* post process the read buffer */
if (!cluster_offset) {
/* nothing to do */
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* nothing to do */
} else {
if (s->crypt_method) {
encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf,
n, 0,
&s->aes_decrypt_key);
}
}
acb->nb_sectors -= n;
acb->sector_num += n;
acb->buf += n * 512;
if (acb->nb_sectors == 0) { if (acb->nb_sectors == 0) {
/* request completed */ /* request completed */
return 0; return 0;
} }
/* prepare next AIO request */ /* prepare next request */
cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, cluster_offset = get_cluster_offset(bs, acb->sector_num << 9,
0, 0, 0, 0); 0, 0, 0, 0);
index_in_cluster = acb->sector_num & (s->cluster_sectors - 1); index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
@ -575,7 +558,6 @@ static int qcow_aio_read_cb(QCowAIOCB *acb)
} else { } else {
/* Note: in this case, no need to wait */ /* Note: in this case, no need to wait */
memset(acb->buf, 0, 512 * n); memset(acb->buf, 0, 512 * n);
goto redo;
} }
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* add AIO support for compressed blocks ? */ /* add AIO support for compressed blocks ? */
@ -584,7 +566,6 @@ static int qcow_aio_read_cb(QCowAIOCB *acb)
} }
memcpy(acb->buf, memcpy(acb->buf,
s->cluster_cache + index_in_cluster * 512, 512 * n); s->cluster_cache + index_in_cluster * 512, 512 * n);
goto redo;
} else { } else {
if ((cluster_offset & 511) != 0) { if ((cluster_offset & 511) != 0) {
return -EIO; return -EIO;
@ -602,6 +583,23 @@ static int qcow_aio_read_cb(QCowAIOCB *acb)
} }
} }
/* post process the read buffer */
if (!cluster_offset) {
/* nothing to do */
} else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
/* nothing to do */
} else {
if (s->crypt_method) {
encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf,
n, 0,
&s->aes_decrypt_key);
}
}
acb->nb_sectors -= n;
acb->sector_num += n;
acb->buf += n * 512;
goto redo; goto redo;
} }
@ -633,16 +631,12 @@ static int qcow_aio_write_cb(QCowAIOCB *acb)
int index_in_cluster; int index_in_cluster;
uint64_t cluster_offset; uint64_t cluster_offset;
const uint8_t *src_buf; const uint8_t *src_buf;
int ret, n = 0; int ret, n;
uint8_t *cluster_data = NULL; uint8_t *cluster_data = NULL;
struct iovec hd_iov; struct iovec hd_iov;
QEMUIOVector hd_qiov; QEMUIOVector hd_qiov;
redo: redo:
acb->nb_sectors -= n;
acb->sector_num += n;
acb->buf += n * 512;
if (acb->nb_sectors == 0) { if (acb->nb_sectors == 0) {
/* request completed */ /* request completed */
return 0; return 0;
@ -685,6 +679,11 @@ redo:
if (ret < 0) { if (ret < 0) {
return ret; return ret;
} }
acb->nb_sectors -= n;
acb->sector_num += n;
acb->buf += n * 512;
goto redo; goto redo;
} }