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fuse: iqueue locking
Use fiq->waitq.lock for protecting members of struct fuse_iqueue and FR_PENDING request flag, previously protected by fc->lock. Following patches will remove fc->lock protection from these members. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
This commit is contained in:
parent
ef75925886
commit
4ce6081260
1 changed files with 45 additions and 6 deletions
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@ -328,7 +328,7 @@ static void queue_request(struct fuse_iqueue *fiq, struct fuse_req *req)
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req->in.h.len = sizeof(struct fuse_in_header) +
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len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
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list_add_tail(&req->list, &fiq->pending);
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wake_up(&fiq->waitq);
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wake_up_locked(&fiq->waitq);
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kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
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}
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@ -341,14 +341,16 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
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forget->forget_one.nlookup = nlookup;
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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if (fiq->connected) {
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fiq->forget_list_tail->next = forget;
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fiq->forget_list_tail = forget;
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wake_up(&fiq->waitq);
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wake_up_locked(&fiq->waitq);
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kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
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} else {
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kfree(forget);
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}
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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}
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@ -362,8 +364,10 @@ static void flush_bg_queue(struct fuse_conn *fc)
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req = list_entry(fc->bg_queue.next, struct fuse_req, list);
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list_del(&req->list);
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fc->active_background++;
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spin_lock(&fiq->waitq.lock);
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req->in.h.unique = fuse_get_unique(fiq);
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queue_request(fiq, req);
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spin_unlock(&fiq->waitq.lock);
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}
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}
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@ -380,10 +384,13 @@ static void flush_bg_queue(struct fuse_conn *fc)
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static void request_end(struct fuse_conn *fc, struct fuse_req *req)
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__releases(fc->lock)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
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req->end = NULL;
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list_del_init(&req->list);
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spin_lock(&fiq->waitq.lock);
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list_del_init(&req->intr_entry);
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spin_unlock(&fiq->waitq.lock);
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WARN_ON(test_bit(FR_PENDING, &req->flags));
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WARN_ON(test_bit(FR_SENT, &req->flags));
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smp_wmb();
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@ -415,13 +422,16 @@ __releases(fc->lock)
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static void queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req)
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{
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spin_lock(&fiq->waitq.lock);
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list_add_tail(&req->intr_entry, &fiq->interrupts);
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wake_up(&fiq->waitq);
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wake_up_locked(&fiq->waitq);
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spin_unlock(&fiq->waitq.lock);
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kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
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}
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static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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int err;
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if (!fc->no_interrupt) {
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@ -434,7 +444,7 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
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spin_lock(&fc->lock);
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set_bit(FR_INTERRUPTED, &req->flags);
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if (test_bit(FR_SENT, &req->flags))
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queue_interrupt(&fc->iq, req);
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queue_interrupt(fiq, req);
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spin_unlock(&fc->lock);
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}
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@ -451,14 +461,17 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
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return;
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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/* Request is not yet in userspace, bail out */
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if (test_bit(FR_PENDING, &req->flags)) {
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list_del(&req->list);
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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__fuse_put_request(req);
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req->out.h.error = -EINTR;
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return;
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}
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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}
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@ -475,8 +488,10 @@ static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
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BUG_ON(test_bit(FR_BACKGROUND, &req->flags));
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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if (!fiq->connected) {
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spin_unlock(&fc->lock);
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spin_unlock(&fiq->waitq.lock);
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req->out.h.error = -ENOTCONN;
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} else {
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req->in.h.unique = fuse_get_unique(fiq);
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@ -484,6 +499,7 @@ static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
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/* acquire extra reference, since request is still needed
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after request_end() */
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__fuse_get_request(req);
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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request_wait_answer(fc, req);
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@ -619,10 +635,12 @@ static int fuse_request_send_notify_reply(struct fuse_conn *fc,
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__clear_bit(FR_ISREPLY, &req->flags);
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req->in.h.unique = unique;
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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if (fiq->connected) {
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queue_request(fiq, req);
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err = 0;
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}
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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return err;
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@ -1064,8 +1082,10 @@ static int request_pending(struct fuse_iqueue *fiq)
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/* Wait until a request is available on the pending list */
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static void request_wait(struct fuse_conn *fc)
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__releases(fc->iq.waitq.lock)
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__releases(fc->lock)
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__acquires(fc->lock)
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__acquires(fc->iq.waitq.lock)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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DECLARE_WAITQUEUE(wait, current);
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@ -1076,9 +1096,11 @@ __acquires(fc->lock)
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if (signal_pending(current))
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break;
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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schedule();
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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}
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&fiq->waitq, &wait);
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@ -1094,15 +1116,17 @@ __acquires(fc->lock)
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*/
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static int fuse_read_interrupt(struct fuse_conn *fc, struct fuse_copy_state *cs,
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size_t nbytes, struct fuse_req *req)
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__releases(fc->iq.waitq.lock)
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__releases(fc->lock)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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struct fuse_in_header ih;
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struct fuse_interrupt_in arg;
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unsigned reqsize = sizeof(ih) + sizeof(arg);
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int err;
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list_del_init(&req->intr_entry);
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req->intr_unique = fuse_get_unique(&fc->iq);
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req->intr_unique = fuse_get_unique(fiq);
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memset(&ih, 0, sizeof(ih));
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memset(&arg, 0, sizeof(arg));
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ih.len = reqsize;
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@ -1110,6 +1134,7 @@ __releases(fc->lock)
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ih.unique = req->intr_unique;
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arg.unique = req->in.h.unique;
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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if (nbytes < reqsize)
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return -EINVAL;
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@ -1147,6 +1172,7 @@ static struct fuse_forget_link *dequeue_forget(struct fuse_iqueue *fiq,
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static int fuse_read_single_forget(struct fuse_conn *fc,
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struct fuse_copy_state *cs,
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size_t nbytes)
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__releases(fc->iq.waitq.lock)
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__releases(fc->lock)
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{
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int err;
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@ -1162,6 +1188,7 @@ __releases(fc->lock)
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.len = sizeof(ih) + sizeof(arg),
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};
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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kfree(forget);
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if (nbytes < ih.len)
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@ -1180,6 +1207,7 @@ __releases(fc->lock)
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static int fuse_read_batch_forget(struct fuse_conn *fc,
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struct fuse_copy_state *cs, size_t nbytes)
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__releases(fc->iq.waitq.lock)
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__releases(fc->lock)
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{
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int err;
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@ -1195,12 +1223,14 @@ __releases(fc->lock)
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};
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if (nbytes < ih.len) {
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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return -EINVAL;
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}
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max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one);
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head = dequeue_forget(fiq, max_forgets, &count);
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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arg.count = count;
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@ -1230,6 +1260,7 @@ __releases(fc->lock)
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static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs,
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size_t nbytes)
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__releases(fc->iq.waitq.lock)
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__releases(fc->lock)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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@ -1260,6 +1291,7 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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restart:
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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err = -EAGAIN;
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if ((file->f_flags & O_NONBLOCK) && fiq->connected &&
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!request_pending(fiq))
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@ -1290,6 +1322,8 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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req = list_entry(fiq->pending.next, struct fuse_req, list);
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clear_bit(FR_PENDING, &req->flags);
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list_del_init(&req->list);
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spin_unlock(&fiq->waitq.lock);
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list_add(&req->list, &fc->io);
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in = &req->in;
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@ -1333,6 +1367,7 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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return reqsize;
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err_unlock:
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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return err;
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}
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@ -2055,10 +2090,12 @@ static unsigned fuse_dev_poll(struct file *file, poll_table *wait)
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poll_wait(file, &fiq->waitq, wait);
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spin_lock(&fc->lock);
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spin_lock(&fiq->waitq.lock);
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if (!fiq->connected)
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mask = POLLERR;
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else if (request_pending(fiq))
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mask |= POLLIN | POLLRDNORM;
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spin_unlock(&fiq->waitq.lock);
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spin_unlock(&fc->lock);
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return mask;
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@ -2141,11 +2178,13 @@ void fuse_abort_conn(struct fuse_conn *fc)
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fc->max_background = UINT_MAX;
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flush_bg_queue(fc);
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spin_lock(&fiq->waitq.lock);
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fiq->connected = 0;
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list_splice_init(&fiq->pending, &to_end2);
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while (forget_pending(fiq))
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kfree(dequeue_forget(fiq, 1, NULL));
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wake_up_all(&fiq->waitq);
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wake_up_all_locked(&fiq->waitq);
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spin_unlock(&fiq->waitq.lock);
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kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
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list_splice_init(&fc->processing, &to_end2);
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