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linux: fs_read to use io_uring if iovcnt > IOV_MAX (#4023)

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Just cap it to `IOV_MAX` as it's already done when performing reads
using the threadpool.
This commit is contained in:
Santiago Gimeno 2023-05-25 12:09:51 +02:00 committed by GitHub
parent 1b01b786c0
commit e7b9633170
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1 changed files with 8 additions and 4 deletions
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12
src/unix/linux.c
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@ -914,10 +914,14 @@ int uv__iou_fs_read_or_write(uv_loop_t* loop,
struct uv__io_uring_sqe* sqe;
struct uv__iou* iou;
/* For the moment, if iovcnt is greater than IOV_MAX, fallback to the
* threadpool. In the future we might take advantage of IOSQE_IO_LINK. */
if (req->nbufs > IOV_MAX)
return 0;
/* If iovcnt is greater than IOV_MAX, cap it to IOV_MAX on reads and fallback
* to the threadpool on writes */
if (req->nbufs > IOV_MAX) {
if (is_read)
req->nbufs = IOV_MAX;
else
return 0;
}
iou = &uv__get_internal_fields(loop)->iou;