diff options
| -rw-r--r-- | block/io_uring.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/block/io_uring.c b/block/io_uring.c index 00a3ee9..dfa475c 100644 --- a/block/io_uring.c +++ b/block/io_uring.c @@ -165,7 +165,21 @@ static void luring_process_completions(LuringState *s) total_bytes = ret + luringcb->total_read; if (ret < 0) { - if (ret == -EINTR) { + /* + * Only writev/readv/fsync requests on regular files or host block + * devices are submitted. Therefore -EAGAIN is not expected but it's + * known to happen sometimes with Linux SCSI. Submit again and hope + * the request completes successfully. + * + * For more information, see: + * https://lore.kernel.org/io-uring/20210727165811.284510-3-axboe@kernel.dk/T/#u + * + * If the code is changed to submit other types of requests in the + * future, then this workaround may need to be extended to deal with + * genuine -EAGAIN results that should not be resubmitted + * immediately. + */ + if (ret == -EINTR || ret == -EAGAIN) { luring_resubmit(s, luringcb); continue; } |