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fuse: reserve io-uring entries for critical requests with writeback c… #249

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Merged
hbirth merged 1 commit into from
Oct 11, 2026
Merged

fuse: reserve io-uring entries for critical requests with writeback c… #249

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13 changes: 12 additions & 1 deletion fs/fuse/dev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -764,10 +764,21 @@ int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args,
return -ENOMEM;
__set_bit(FR_BACKGROUND, &req->flags);
} else {
/*
* A critical request must not wait for the background budget:
* async readahead holds its folios locked here, and the budget
* might be held by requests blocked in userspace on a DLM revoke
* that waits for those folios. It still counts in the budget,
* and the limits on active background requests still apply.
*/
bool critical = args->uring_critical && fm->fc->writeback_cache;

WARN_ON(args->nocreds);
req = fuse_get_req(&invalid_mnt_idmap, fm, true);
req = fuse_get_req(&invalid_mnt_idmap, fm, !critical);
if (IS_ERR(req))
return PTR_ERR(req);
if (critical)
__set_bit(FR_BACKGROUND, &req->flags);
}

fuse_args_to_req(req, args);
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