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rbd: define an rbd object request flags field 

We're going to need some more Boolean values for object requests,
so create a flags bit field and use it to record whether the request
is done.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-02-11 12:33:24 -06:00 committed by Sage Weil
parent 1217857fbf
commit 926f9b3f08
1 changed files with 29 additions and 29 deletions
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58
drivers/block/rbd.c
View File

@ -170,10 +170,15 @@ enum obj_request_type {
OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES
}; };
enum obj_req_flags {
OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */
};
struct rbd_obj_request { struct rbd_obj_request {
const char *object_name; const char *object_name;
u64 offset; /* object start byte */ u64 offset; /* object start byte */
u64 length; /* bytes from offset */ u64 length; /* bytes from offset */
unsigned long flags;
struct rbd_img_request *img_request; struct rbd_img_request *img_request;
u64 img_offset; /* image relative offset */ u64 img_offset; /* image relative offset */
@ -194,7 +199,6 @@ struct rbd_obj_request {
u64 xferred; /* bytes transferred */ u64 xferred; /* bytes transferred */
u64 version; u64 version;
int result; int result;
atomic_t done;
rbd_obj_callback_t callback; rbd_obj_callback_t callback;
struct completion completion; struct completion completion;
@ -1072,6 +1076,29 @@ out_err:
return NULL; return NULL;
} }
/*
* The default/initial value for all object request flags is 0. For
* each flag, once its value is set to 1 it is never reset to 0
* again.
*/
static void obj_request_done_set(struct rbd_obj_request *obj_request)
{
if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) {
struct rbd_img_request *img_request = obj_request->img_request;
struct rbd_device *rbd_dev;
rbd_dev = img_request ? img_request->rbd_dev : NULL;
rbd_warn(rbd_dev, "obj_request %p already marked done\n",
obj_request);
}
}
static bool obj_request_done_test(struct rbd_obj_request *obj_request)
{
smp_mb();
return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0;
}
static void rbd_obj_request_get(struct rbd_obj_request *obj_request) static void rbd_obj_request_get(struct rbd_obj_request *obj_request)
{ {
dout("%s: obj %p (was %d)\n", __func__, obj_request, dout("%s: obj %p (was %d)\n", __func__, obj_request,
@ -1192,33 +1219,6 @@ static int rbd_obj_request_wait(struct rbd_obj_request *obj_request)
return wait_for_completion_interruptible(&obj_request->completion); return wait_for_completion_interruptible(&obj_request->completion);
} }
static void obj_request_done_init(struct rbd_obj_request *obj_request)
{
atomic_set(&obj_request->done, 0);
smp_wmb();
}
static void obj_request_done_set(struct rbd_obj_request *obj_request)
{
int done;
done = atomic_inc_return(&obj_request->done);
if (done > 1) {
struct rbd_img_request *img_request = obj_request->img_request;
struct rbd_device *rbd_dev;
rbd_dev = img_request ? img_request->rbd_dev : NULL;
rbd_warn(rbd_dev, "obj_request %p was already done\n",
obj_request);
}
}
static bool obj_request_done_test(struct rbd_obj_request *obj_request)
{
smp_mb();
return atomic_read(&obj_request->done) != 0;
}
/* /*
* The default/initial value for all image request flags is 0. Each * The default/initial value for all image request flags is 0. Each
* is conditionally set to 1 at image request initialization time * is conditionally set to 1 at image request initialization time
@ -1475,10 +1475,10 @@ static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
obj_request->object_name = memcpy(name, object_name, size); obj_request->object_name = memcpy(name, object_name, size);
obj_request->offset = offset; obj_request->offset = offset;
obj_request->length = length; obj_request->length = length;
obj_request->flags = 0;
obj_request->which = BAD_WHICH; obj_request->which = BAD_WHICH;
obj_request->type = type; obj_request->type = type;
INIT_LIST_HEAD(&obj_request->links); INIT_LIST_HEAD(&obj_request->links);
obj_request_done_init(obj_request);
init_completion(&obj_request->completion); init_completion(&obj_request->completion);
kref_init(&obj_request->kref); kref_init(&obj_request->kref);