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Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

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# gpg: Signature made Thu 07 Jul 2022 01:42:38 PM +0530
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  block/io_uring: clarify that short reads can happen
  io_uring: fix short read slow path

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-07-07 14:32:08 +05:30
commit a74c66b1b9
1 changed files with 4 additions and 8 deletions
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12
block/io_uring.c
View File

@ -73,12 +73,8 @@ static void luring_resubmit(LuringState *s, LuringAIOCB *luringcb)
/**
* luring_resubmit_short_read:
*
* Before Linux commit 9d93a3f5a0c ("io_uring: punt short reads to async
* context") a buffered I/O request with the start of the file range in the
* page cache could result in a short read. Applications need to resubmit the
* remaining read request.
*
* This is a slow path but recent kernels never take it.
* Short reads are rare but may occur. The remaining read request needs to be
* resubmitted.
*/
static void luring_resubmit_short_read(LuringState *s, LuringAIOCB *luringcb,
int nread)
@ -89,7 +85,7 @@ static void luring_resubmit_short_read(LuringState *s, LuringAIOCB *luringcb,
trace_luring_resubmit_short_read(s, luringcb, nread);
/* Update read position */
luringcb->total_read = nread;
luringcb->total_read += nread;
remaining = luringcb->qiov->size - luringcb->total_read;
/* Shorten qiov */
@ -103,7 +99,7 @@ static void luring_resubmit_short_read(LuringState *s, LuringAIOCB *luringcb,
remaining);
/* Update sqe */
luringcb->sqeq.off = nread;
luringcb->sqeq.off += nread;
luringcb->sqeq.addr = (__u64)(uintptr_t)luringcb->resubmit_qiov.iov;
luringcb->sqeq.len = luringcb->resubmit_qiov.niov;