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Redfs ubuntu noble 6.8.0 58.60 updates reduce queues #6

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Redfs ubuntu noble 6.8.0 58.60 updates reduce queues #6

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d7dc318
fuse: {io-uring} Add queue length counters
bsbernd Jun 2, 2025
191c2c5
fuse: {io-uring} Rename ring->nr_queues to max_nr_queues
bsbernd Jun 13, 2025
3bcbcde
fuse: {io-uring}: Use a bitmap which queues are available
bsbernd Jun 10, 2025
251ceb6
fuse: {io-uring} Distribute load among queues
bsbernd Jun 14, 2025
d763efd
fuse: {io-uring} Allow reduced number of ring queues
bsbernd Jun 4, 2025
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fuse: {io-uring} Allow reduced number of ring queues 
Now that queue selection for fuse requests supports missing
queues we don't need to wait for full queue initialization.
In fact, fuse-server (daemon) might want to run with a reduced
number of queues, for example to reduce memory usage.
This also simplifies startup - after first queue entry
registration fuse-io-uring is ready to be used.

Signed-off-by: Bernd Schubert <[email protected]>
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@bsbernd
bsbernd committed Jun 26, 2025
commit d763efd86aece25cc43542a29703104e7fb66fdc
35 changes: 3 additions & 32 deletions fs/fuse/dev_uring.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1113,31 +1113,6 @@ static int fuse_uring_commit_fetch(struct io_uring_cmd *cmd, int issue_flags,
return 0;
}

static bool is_ring_ready(struct fuse_ring *ring, int current_qid)
{
int qid;
struct fuse_ring_queue *queue;
bool ready = true;

for (qid = 0; qid < ring->max_nr_queues && ready; qid++) {
if (current_qid == qid)
continue;

queue = ring->queues[qid];
if (!queue) {
ready = false;
break;
}

spin_lock(&queue->lock);
if (list_empty(&queue->ent_avail_queue))
ready = false;
spin_unlock(&queue->lock);
}

return ready;
}

/*
* fuse_uring_req_fetch command handling
*/
Expand All @@ -1158,13 +1133,9 @@ static void fuse_uring_do_register(struct fuse_ring_ent *ent,
spin_unlock(&queue->lock);

if (!ring->ready) {
bool ready = is_ring_ready(ring, queue->qid);

if (ready) {
WRITE_ONCE(fiq->ops, &fuse_io_uring_ops);
WRITE_ONCE(ring->ready, true);
wake_up_all(&fc->blocked_waitq);
}
WRITE_ONCE(fiq->ops, &fuse_io_uring_ops);
WRITE_ONCE(ring->ready, true);
wake_up_all(&fc->blocked_waitq);
}
}

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