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UPSTREAM: erofs: avoid memory allocation failure during rolling decompression

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Currently, err would be treated as io error. Therefore, it'd be
better to ensure memory allocation during rolling decompression
to avoid such io error.

In the long term, we might consider adding another !Uptodate case
for such case.

Link: https://lore.kernel.org/r/20210316031515.90954-1-huangjianan@oppo.com
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Signed-off-by: Guo Weichao <guoweichao@oppo.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>

Bug: 190585249
Change-Id: I8bab4ab3e0d26b698fc0054517065872eafa5d15
(cherry picked from commit b4892fa3e7fd69e78a82356de45b90758589cafc)
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
This commit is contained in:
Huang Jianan 2021-03-16 11:15:14 +08:00 • committed by Michael Bestas
commit cdb254fa4d
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GPG key ID: CC95044519BE6669
1 changed files with 2 additions and 3 deletions
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5
fs/erofs/decompressor.c
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@ -77,9 +77,8 @@ static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq,
victim = availables[--top];
get_page(victim);
} else {
victim = erofs_allocpage(pagepool, GFP_KERNEL);
if (!victim)
return -ENOMEM;
victim = erofs_allocpage(pagepool,
GFP_KERNEL | __GFP_NOFAIL);
set_page_private(victim, Z_EROFS_SHORTLIVED_PAGE);
}
rq->out[i] = victim;