fuse: no fc->lock for iqueue parts
Remove fc->lock protection from input queue members, now protected by fiq->waitq.lock. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
This commit is contained in:
Miklos Szeredi
parent
8f7bb368db
commit
fd22d62ed0
1 changed files with 20 additions and 51 deletions
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@ -340,7 +340,6 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
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forget->forget_one.nodeid = nodeid;
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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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@ -351,7 +350,6 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
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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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static void flush_bg_queue(struct fuse_conn *fc)
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@ -443,13 +441,11 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
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if (!err)
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return;
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spin_lock(&fc->lock);
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set_bit(FR_INTERRUPTED, &req->flags);
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/* matches barrier in fuse_dev_do_read() */
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smp_mb__after_atomic();
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if (test_bit(FR_SENT, &req->flags))
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queue_interrupt(fiq, req);
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spin_unlock(&fc->lock);
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}
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if (!test_bit(FR_FORCE, &req->flags)) {
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@ -464,19 +460,16 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
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if (!err)
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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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/*
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@ -491,10 +484,8 @@ static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
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struct fuse_iqueue *fiq = &fc->iq;
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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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@ -504,7 +495,6 @@ static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
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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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/* Pairs with smp_wmb() in request_end() */
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@ -638,14 +628,12 @@ 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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}
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@ -1085,13 +1073,10 @@ static int request_pending(struct fuse_iqueue *fiq)
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}
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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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static void request_wait(struct fuse_iqueue *fiq)
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__releases(fiq->waitq.lock)
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__acquires(fiq->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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add_wait_queue_exclusive(&fiq->waitq, &wait);
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@ -1101,9 +1086,7 @@ __acquires(fc->iq.waitq.lock)
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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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@ -1116,14 +1099,13 @@ __acquires(fc->iq.waitq.lock)
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* Unlike other requests this is assembled on demand, without a need
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* to allocate a separate fuse_req structure.
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*
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* Called with fc->lock held, releases it
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* Called with fiq->waitq.lock held, releases it
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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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static int fuse_read_interrupt(struct fuse_iqueue *fiq,
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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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__releases(fiq->waitq.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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@ -1139,7 +1121,6 @@ __releases(fc->lock)
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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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@ -1173,14 +1154,12 @@ static struct fuse_forget_link *dequeue_forget(struct fuse_iqueue *fiq,
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return head;
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}
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static int fuse_read_single_forget(struct fuse_conn *fc,
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static int fuse_read_single_forget(struct fuse_iqueue *fiq,
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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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__releases(fiq->waitq.lock)
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{
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int err;
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struct fuse_iqueue *fiq = &fc->iq;
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struct fuse_forget_link *forget = dequeue_forget(fiq, 1, NULL);
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struct fuse_forget_in arg = {
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.nlookup = forget->forget_one.nlookup,
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@ -1193,7 +1172,6 @@ __releases(fc->lock)
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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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return -EINVAL;
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@ -1209,16 +1187,14 @@ __releases(fc->lock)
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return ih.len;
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}
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static int fuse_read_batch_forget(struct fuse_conn *fc,
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static int fuse_read_batch_forget(struct fuse_iqueue *fiq,
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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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__releases(fiq->waitq.lock)
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{
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int err;
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unsigned max_forgets;
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unsigned count;
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struct fuse_forget_link *head;
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struct fuse_iqueue *fiq = &fc->iq;
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struct fuse_batch_forget_in arg = { .count = 0 };
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struct fuse_in_header ih = {
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.opcode = FUSE_BATCH_FORGET,
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@ -1228,14 +1204,12 @@ __releases(fc->lock)
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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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ih.len += count * sizeof(struct fuse_forget_one);
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@ -1262,17 +1236,15 @@ __releases(fc->lock)
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return ih.len;
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}
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static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs,
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static int fuse_read_forget(struct fuse_conn *fc, struct fuse_iqueue *fiq,
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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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__releases(fiq->waitq.lock)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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if (fc->minor < 16 || fiq->forget_list_head.next->next == NULL)
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return fuse_read_single_forget(fc, cs, nbytes);
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return fuse_read_single_forget(fiq, cs, nbytes);
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else
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return fuse_read_batch_forget(fc, cs, nbytes);
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return fuse_read_batch_forget(fiq, cs, nbytes);
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}
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/*
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@ -1294,14 +1266,13 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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unsigned reqsize;
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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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goto err_unlock;
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request_wait(fc);
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request_wait(fiq);
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err = -ENODEV;
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if (!fiq->connected)
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goto err_unlock;
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@ -1312,12 +1283,12 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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if (!list_empty(&fiq->interrupts)) {
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req = list_entry(fiq->interrupts.next, struct fuse_req,
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intr_entry);
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return fuse_read_interrupt(fc, cs, nbytes, req);
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return fuse_read_interrupt(fiq, cs, nbytes, req);
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}
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if (forget_pending(fiq)) {
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if (list_empty(&fiq->pending) || fiq->forget_batch-- > 0)
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return fuse_read_forget(fc, cs, nbytes);
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return fuse_read_forget(fc, fiq, cs, nbytes);
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if (fiq->forget_batch <= -8)
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fiq->forget_batch = 16;
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@ -1328,6 +1299,7 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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list_del_init(&req->list);
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spin_unlock(&fiq->waitq.lock);
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spin_lock(&fc->lock);
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list_add(&req->list, &fc->io);
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in = &req->in;
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@ -1374,7 +1346,6 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file,
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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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@ -2095,14 +2066,12 @@ static unsigned fuse_dev_poll(struct file *file, poll_table *wait)
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fiq = &fc->iq;
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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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}
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