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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2012-02-07 13:27:27 +0000
committerKevin Wolf <kwolf@redhat.com>2012-02-09 16:17:50 +0100
commit6e4f59bd0d69f0a7aa4010b49a5c49a01987b9d8 (patch)
treecb700373b4032a2fa495234789aa327eba304c51 /block
parent79c053bde9fa40595670ae274d047da07f1df88c (diff)
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qed: replace is_write with flags field
Per-request attributes like read/write are currently implemented as bool fields in the QEDAIOCB struct. This becomes unwiedly as the number of attributes grows. For example, the qed_aio_setup() function would have to take multiple bool arguments and at call sites it would be hard to distinguish the meaning of each bool. Instead use a flags field with bitmask constants. This will be used when zero write support is added. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/qed.c15
-rw-r--r--block/qed.h6
2 files changed, 13 insertions, 8 deletions
diff --git a/block/qed.c b/block/qed.c
index 8da3ebe..b66dd17 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1233,8 +1233,8 @@ static void qed_aio_next_io(void *opaque, int ret)
{
QEDAIOCB *acb = opaque;
BDRVQEDState *s = acb_to_s(acb);
- QEDFindClusterFunc *io_fn =
- acb->is_write ? qed_aio_write_data : qed_aio_read_data;
+ QEDFindClusterFunc *io_fn = (acb->flags & QED_AIOCB_WRITE) ?
+ qed_aio_write_data : qed_aio_read_data;
trace_qed_aio_next_io(s, acb, ret, acb->cur_pos + acb->cur_qiov.size);
@@ -1264,14 +1264,14 @@ static BlockDriverAIOCB *qed_aio_setup(BlockDriverState *bs,
int64_t sector_num,
QEMUIOVector *qiov, int nb_sectors,
BlockDriverCompletionFunc *cb,
- void *opaque, bool is_write)
+ void *opaque, int flags)
{
QEDAIOCB *acb = qemu_aio_get(&qed_aio_pool, bs, cb, opaque);
trace_qed_aio_setup(bs->opaque, acb, sector_num, nb_sectors,
- opaque, is_write);
+ opaque, flags);
- acb->is_write = is_write;
+ acb->flags = flags;
acb->finished = NULL;
acb->qiov = qiov;
acb->qiov_offset = 0;
@@ -1291,7 +1291,7 @@ static BlockDriverAIOCB *bdrv_qed_aio_readv(BlockDriverState *bs,
BlockDriverCompletionFunc *cb,
void *opaque)
{
- return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, false);
+ return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
}
static BlockDriverAIOCB *bdrv_qed_aio_writev(BlockDriverState *bs,
@@ -1300,7 +1300,8 @@ static BlockDriverAIOCB *bdrv_qed_aio_writev(BlockDriverState *bs,
BlockDriverCompletionFunc *cb,
void *opaque)
{
- return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, true);
+ return qed_aio_setup(bs, sector_num, qiov, nb_sectors, cb,
+ opaque, QED_AIOCB_WRITE);
}
static BlockDriverAIOCB *bdrv_qed_aio_flush(BlockDriverState *bs,
diff --git a/block/qed.h b/block/qed.h
index 62cbd3b..abed147 100644
--- a/block/qed.h
+++ b/block/qed.h
@@ -123,12 +123,16 @@ typedef struct QEDRequest {
CachedL2Table *l2_table;
} QEDRequest;
+enum {
+ QED_AIOCB_WRITE = 0x0001, /* read or write? */
+};
+
typedef struct QEDAIOCB {
BlockDriverAIOCB common;
QEMUBH *bh;
int bh_ret; /* final return status for completion bh */
QSIMPLEQ_ENTRY(QEDAIOCB) next; /* next request */
- bool is_write; /* false - read, true - write */
+ int flags; /* QED_AIOCB_* bits ORed together */
bool *finished; /* signal for cancel completion */
uint64_t end_pos; /* request end on block device, in bytes */