linux-kernel - [PATCH 05/15] mm: allow read-ahead with IOCB

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Message-Id: <20200618144355.17324-6-axboe@kernel.dk>
Date:   Thu, 18 Jun 2020 08:43:45 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     io-uring@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 05/15] mm: allow read-ahead with IOCB_NOWAIT set

The read-ahead shouldn't block, so allow it to be done even if
IOCB_NOWAIT is set in the kiocb.

Acked-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 mm/filemap.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index f0ae9a6308cb..3378d4fca883 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2028,8 +2028,6 @@ ssize_t generic_file_buffered_read(struct kiocb *iocb,
 
 		page = find_get_page(mapping, index);
 		if (!page) {
-			if (iocb->ki_flags & IOCB_NOWAIT)
-				goto would_block;
 			page_cache_sync_readahead(mapping,
 					ra, filp,
 					index, last_index - index);
-- 
2.27.0