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io_uring: ensure reads re-import for selected buffers

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If we drop buffers between scheduling a retry, then we need to re-import
when we start the request again.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-03-10 09:54:25 -07:00
parent 9af177ee3e
commit 2be2eb02e2
1 changed files with 10 additions and 0 deletions
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10
fs/io_uring.c
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@ -3737,6 +3737,16 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
if (unlikely(ret < 0))
return ret;
} else {
/*
* Safe and required to re-import if we're using provided
* buffers, as we dropped the selected one before retry.
*/
if (req->flags & REQ_F_BUFFER_SELECT) {
ret = io_import_iovec(READ, req, &iovec, s, issue_flags);
if (unlikely(ret < 0))
return ret;
}
rw = req->async_data;
s = &rw->s;
/*