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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>
This commit is contained in:
Stefan Hajnoczi 2012-02-07 13:27:27 +00:00 committed by Kevin Wolf
parent 79c053bde9
commit 6e4f59bd0d
3 changed files with 14 additions and 9 deletions
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15
block/qed.c
View File

@ -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,

6
block/qed.h
View File

@ -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 */

2
trace-events
View File

@ -321,7 +321,7 @@ qed_need_check_timer_cb(void *s) "s %p"
qed_start_need_check_timer(void *s) "s %p"
qed_cancel_need_check_timer(void *s) "s %p"
qed_aio_complete(void *s, void *acb, int ret) "s %p acb %p ret %d"
qed_aio_setup(void *s, void *acb, int64_t sector_num, int nb_sectors, void *opaque, int is_write) "s %p acb %p sector_num %"PRId64" nb_sectors %d opaque %p is_write %d"
qed_aio_setup(void *s, void *acb, int64_t sector_num, int nb_sectors, void *opaque, int flags) "s %p acb %p sector_num %"PRId64" nb_sectors %d opaque %p flags %#x"
qed_aio_next_io(void *s, void *acb, int ret, uint64_t cur_pos) "s %p acb %p ret %d cur_pos %"PRIu64
qed_aio_read_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
qed_aio_write_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"