linux-kernel - [PATCH] ubifs: Change gfp flags in page allocation for bulk read

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Date:   Tue, 13 Jun 2017 15:30:47 +0900
From:   Hyunchul Lee <hyc.lee@...il.com>
To:     Richard Weinberger <richard@....at>
Cc:     Artem Bityutskiy <dedekind1@...il.com>, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, kernel-team@....com
Subject: [PATCH] ubifs: Change gfp flags in page allocation for bulk read

From: Hyunchul Lee <cheol.lee@....com>

Use readahead_gfp_mask for gfp flags when allocating pages.
This set additional flags which are __GFP_NORETRY and
__GFP_NOWARN. So OOMs and a failure message can be
avoided.
And we should remove __GFP_FS from flags to prevent from
calling ubifs_writepage during page reclaim.

Signed-off-by: Hyunchul Lee <cheol.lee@....com>
---
 fs/ubifs/file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index d9ae86f..4396c04 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -735,6 +735,7 @@ static int ubifs_do_bulk_read(struct ubifs_info *c, struct bu_info *bu,
 	int err, page_idx, page_cnt, ret = 0, n = 0;
 	int allocate = bu->buf ? 0 : 1;
 	loff_t isize;
+	gfp_t ra_gfp_mask = readahead_gfp_mask(mapping) & ~__GFP_FS;
 
 	err = ubifs_tnc_get_bu_keys(c, bu);
 	if (err)
@@ -796,8 +797,7 @@ static int ubifs_do_bulk_read(struct ubifs_info *c, struct bu_info *bu,
 
 		if (page_offset > end_index)
 			break;
-		page = find_or_create_page(mapping, page_offset,
-					   GFP_NOFS | __GFP_COLD);
+		page = find_or_create_page(mapping, page_offset, ra_gfp_mask);
 		if (!page)
 			break;
 		if (!PageUptodate(page))
-- 
1.9.1