return do_get_request(fc);
}
+/* Must be called with fuse_lock held */
static void fuse_putback_request(struct fuse_conn *fc, struct fuse_req *req)
{
- spin_lock(&fuse_lock);
if (req->preallocated) {
atomic_dec(&fc->num_waiting);
list_add(&req->list, &fc->unused_list);
fc->outstanding_debt--;
else
up(&fc->outstanding_sem);
- spin_unlock(&fuse_lock);
}
void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
+{
+ if (atomic_dec_and_test(&req->count)) {
+ spin_lock(&fuse_lock);
+ fuse_putback_request(fc, req);
+ spin_unlock(&fuse_lock);
+ }
+}
+
+static void fuse_put_request_locked(struct fuse_conn *fc, struct fuse_req *req)
{
if (atomic_dec_and_test(&req->count))
fuse_putback_request(fc, req);
spin_unlock(&fuse_lock);
}
-static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
-{
- int i;
- struct fuse_init_out *arg = &req->misc.init_out;
-
- if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
- fc->conn_error = 1;
- else {
- fc->minor = arg->minor;
- fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
- }
-
- /* After INIT reply is received other requests can go
- out. So do (FUSE_MAX_OUTSTANDING - 1) number of
- up()s on outstanding_sem. The last up() is done in
- fuse_putback_request() */
- for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
- up(&fc->outstanding_sem);
-}
-
/*
* This function is called when a request is finished. Either a reply
* has arrived or it was interrupted (and not yet sent) or some error
* occurred during communication with userspace, or the device file
* was closed. In case of a background request the reference to the
* stored objects are released. The requester thread is woken up (if
- * still waiting), and finally the reference to the request is
- * released
+ * still waiting), the 'end' callback is called if given, else the
+ * reference to the request is released
+ *
+ * Releasing extra reference for foreground requests must be done
+ * within the same locked region as setting state to finished. This
+ * is because fuse_reset_request() may be called after request is
+ * finished and it must be the sole possessor. If request is
+ * interrupted and put in the background, it will return with an error
+ * and hence never be reset and reused.
*
* Called with fuse_lock, unlocks it
*/
{
list_del(&req->list);
req->state = FUSE_REQ_FINISHED;
- spin_unlock(&fuse_lock);
- if (req->background) {
+ if (!req->background) {
+ wake_up(&req->waitq);
+ fuse_put_request_locked(fc, req);
+ spin_unlock(&fuse_lock);
+ } else {
+ void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
+ req->end = NULL;
+ spin_unlock(&fuse_lock);
down_read(&fc->sbput_sem);
if (fc->mounted)
fuse_release_background(req);
up_read(&fc->sbput_sem);
+ if (end)
+ end(fc, req);
+ else
+ fuse_put_request(fc, req);
}
- wake_up(&req->waitq);
- if (req->in.h.opcode == FUSE_INIT)
- process_init_reply(fc, req);
- else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {
- /* Special case for failed iget in CREATE */
- u64 nodeid = req->in.h.nodeid;
- fuse_reset_request(req);
- fuse_send_forget(fc, req, nodeid, 1);
- return;
- }
- fuse_put_request(fc, req);
}
/*
request_send_nowait(fc, req);
}
-void fuse_send_init(struct fuse_conn *fc)
-{
- /* This is called from fuse_read_super() so there's guaranteed
- to be exactly one request available */
- struct fuse_req *req = fuse_get_request(fc);
- struct fuse_init_in *arg = &req->misc.init_in;
- arg->major = FUSE_KERNEL_VERSION;
- arg->minor = FUSE_KERNEL_MINOR_VERSION;
- req->in.h.opcode = FUSE_INIT;
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(*arg);
- req->in.args[0].value = arg;
- req->out.numargs = 1;
- /* Variable length arguement used for backward compatibility
- with interface version < 7.5. Rest of init_out is zeroed
- by do_get_request(), so a short reply is not a problem */
- req->out.argvar = 1;
- req->out.args[0].size = sizeof(struct fuse_init_out);
- req->out.args[0].value = &req->misc.init_out;
- request_send_background(fc, req);
-}
-
/*
* Lock the request. Up to the next unlock_request() there mustn't be
* anything that could cause a page-fault. If the request was already
* The requests are set to interrupted and finished, and the request
* waiter is woken up. This will make request_wait_answer() wait
* until the request is unlocked and then return.
+ *
+ * If the request is asynchronous, then the end function needs to be
+ * called after waiting for the request to be unlocked (if it was
+ * locked).
*/
static void end_io_requests(struct fuse_conn *fc)
{
while (!list_empty(&fc->io)) {
- struct fuse_req *req;
- req = list_entry(fc->io.next, struct fuse_req, list);
+ struct fuse_req *req =
+ list_entry(fc->io.next, struct fuse_req, list);
+ void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
+
req->interrupted = 1;
req->out.h.error = -ECONNABORTED;
req->state = FUSE_REQ_FINISHED;
list_del_init(&req->list);
wake_up(&req->waitq);
+ if (end) {
+ req->end = NULL;
+ /* The end function will consume this reference */
+ __fuse_get_request(req);
+ spin_unlock(&fuse_lock);
+ wait_event(req->waitq, !req->locked);
+ end(fc, req);
+ spin_lock(&fuse_lock);
+ }
}
}
projects / karo-tx-linux.git / blobdiff