scsi-generic: identify AIO callbacks more clearly
Functions that are not callbacks should assert that aiocb is NULL and have a SCSIGenericReq argument. AIO callbacks should assert that aiocb is not NULL. They also have an opaque argument. Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
parent
5fd2b563a7
commit
fa0d653b06
|
@ -88,12 +88,12 @@ static void scsi_free_request(SCSIRequest *req)
|
|||
}
|
||||
|
||||
/* Helper function for command completion. */
|
||||
static void scsi_command_complete(void *opaque, int ret)
|
||||
static void scsi_command_complete_noio(SCSIGenericReq *r, int ret)
|
||||
{
|
||||
int status;
|
||||
SCSIGenericReq *r = (SCSIGenericReq *)opaque;
|
||||
|
||||
r->req.aiocb = NULL;
|
||||
assert(r->req.aiocb == NULL);
|
||||
|
||||
if (r->req.io_canceled) {
|
||||
scsi_req_cancel_complete(&r->req);
|
||||
goto done;
|
||||
|
@ -142,6 +142,15 @@ done:
|
|||
scsi_req_unref(&r->req);
|
||||
}
|
||||
|
||||
static void scsi_command_complete(void *opaque, int ret)
|
||||
{
|
||||
SCSIGenericReq *r = (SCSIGenericReq *)opaque;
|
||||
|
||||
assert(r->req.aiocb != NULL);
|
||||
r->req.aiocb = NULL;
|
||||
scsi_command_complete_noio(r, ret);
|
||||
}
|
||||
|
||||
static int execute_command(BlockBackend *blk,
|
||||
SCSIGenericReq *r, int direction,
|
||||
BlockCompletionFunc *complete)
|
||||
|
@ -172,18 +181,23 @@ static void scsi_read_complete(void * opaque, int ret)
|
|||
SCSIDevice *s = r->req.dev;
|
||||
int len;
|
||||
|
||||
assert(r->req.aiocb != NULL);
|
||||
r->req.aiocb = NULL;
|
||||
|
||||
if (ret || r->req.io_canceled) {
|
||||
scsi_command_complete(r, ret);
|
||||
scsi_command_complete_noio(r, ret);
|
||||
return;
|
||||
}
|
||||
|
||||
len = r->io_header.dxfer_len - r->io_header.resid;
|
||||
DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len);
|
||||
|
||||
r->len = -1;
|
||||
if (len == 0) {
|
||||
scsi_command_complete(r, 0);
|
||||
} else {
|
||||
scsi_command_complete_noio(r, 0);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Snoop READ CAPACITY output to set the blocksize. */
|
||||
if (r->req.cmd.buf[0] == READ_CAPACITY_10 &&
|
||||
(ldl_be_p(&r->buf[0]) != 0xffffffffU || s->max_lba == 0)) {
|
||||
|
@ -199,7 +213,6 @@ static void scsi_read_complete(void * opaque, int ret)
|
|||
scsi_req_data(&r->req, len);
|
||||
scsi_req_unref(&r->req);
|
||||
}
|
||||
}
|
||||
|
||||
/* Read more data from scsi device into buffer. */
|
||||
static void scsi_read_data(SCSIRequest *req)
|
||||
|
@ -213,14 +226,14 @@ static void scsi_read_data(SCSIRequest *req)
|
|||
/* The request is used as the AIO opaque value, so add a ref. */
|
||||
scsi_req_ref(&r->req);
|
||||
if (r->len == -1) {
|
||||
scsi_command_complete(r, 0);
|
||||
scsi_command_complete_noio(r, 0);
|
||||
return;
|
||||
}
|
||||
|
||||
ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV,
|
||||
scsi_read_complete);
|
||||
if (ret < 0) {
|
||||
scsi_command_complete(r, ret);
|
||||
scsi_command_complete_noio(r, ret);
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -230,9 +243,12 @@ static void scsi_write_complete(void * opaque, int ret)
|
|||
SCSIDevice *s = r->req.dev;
|
||||
|
||||
DPRINTF("scsi_write_complete() ret = %d\n", ret);
|
||||
|
||||
assert(r->req.aiocb != NULL);
|
||||
r->req.aiocb = NULL;
|
||||
|
||||
if (ret || r->req.io_canceled) {
|
||||
scsi_command_complete(r, ret);
|
||||
scsi_command_complete_noio(r, ret);
|
||||
return;
|
||||
}
|
||||
|
||||
|
@ -242,7 +258,7 @@ static void scsi_write_complete(void * opaque, int ret)
|
|||
DPRINTF("block size %d\n", s->blocksize);
|
||||
}
|
||||
|
||||
scsi_command_complete(r, ret);
|
||||
scsi_command_complete_noio(r, ret);
|
||||
}
|
||||
|
||||
/* Write data to a scsi device. Returns nonzero on failure.
|
||||
|
@ -264,7 +280,7 @@ static void scsi_write_data(SCSIRequest *req)
|
|||
scsi_req_ref(&r->req);
|
||||
ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete);
|
||||
if (ret < 0) {
|
||||
scsi_command_complete(r, ret);
|
||||
scsi_command_complete_noio(r, ret);
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -306,7 +322,7 @@ static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
|
|||
ret = execute_command(s->conf.blk, r, SG_DXFER_NONE,
|
||||
scsi_command_complete);
|
||||
if (ret < 0) {
|
||||
scsi_command_complete(r, ret);
|
||||
scsi_command_complete_noio(r, ret);
|
||||
return 0;
|
||||
}
|
||||
return 0;
|
||||
|
|
Loading…
Reference in a new issue