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UPSTREAM: io_uring: add flag for disabling provided buffer recycling

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commit 8a3e8ee564 upstream.

If we need to continue doing this IO, then we don't want a potentially
selected buffer recycled. Add a flag for that.

Set this for recv/recvmsg if they do partial IO.

Change-Id: If9381bd6a5695c8c85c7a51c3adccc0dc09f8999
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Bug: 268174392
(cherry picked from commit 96ccba4a1a)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Jens Axboe 2022-03-23 09:30:05 -06:00 • committed by Treehugger Robot
commit cf7ef78842
1 changed files with 5 additions and 0 deletions
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5
io_uring/io_uring.c
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@ -750,6 +750,7 @@ enum {
REQ_F_CREDS_BIT,
REQ_F_REFCOUNT_BIT,
REQ_F_ARM_LTIMEOUT_BIT,
REQ_F_PARTIAL_IO_BIT,
/* keep async read/write and isreg together and in order */
REQ_F_NOWAIT_READ_BIT,
REQ_F_NOWAIT_WRITE_BIT,
@ -805,6 +806,8 @@ enum {
REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT),
/* there is a linked timeout that has to be armed */
REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT),
/* request has already done partial IO */
REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT),
};
struct async_poll {
@ -4973,6 +4976,7 @@ static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
ret = -EINTR;
if (ret > 0 && io_net_retry(sock, flags)) {
sr->done_io += ret;
req->flags |= REQ_F_PARTIAL_IO;
return io_setup_async_msg(req, kmsg);
}
req_set_fail(req);
@ -5046,6 +5050,7 @@ out_free:
sr->len -= ret;
sr->buf += ret;
sr->done_io += ret;
req->flags |= REQ_F_PARTIAL_IO;
return -EAGAIN;
}
req_set_fail(req);