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Subject[PATCH v3] ubifs: Change gfp flags in page allocation for bulk read
Date
From: Hyunchul Lee <cheol.lee@lge.com>

In low memory situations, page allocations for bulk read
can kill applications for reclaiming memory, and print an
failure message when allocations are failed.
Because bulk read is just an optimization, we don't have
to do these and can stop page allocations.

Though this siutation happens rarely, add __GFP_NORETRY
to prevent from excessive memory reclaim and killing
applications, and __GFP_WARN to suppress this failure
message.

For this, Use readahead_gfp_mask for gfp flags when
allocating pages.

Signed-off-by: Hyunchul Lee <cheol.lee@lge.com>
---
v3:
* fix the invalid format of version history in
this patch.

v2:
* rewrite a commit message for explaining why this
patch is needed.

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
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