Huang Jianan a60cb39186 erofs: avoid using generic_block_bmap
[ Upstream commit d8b3df8b1048405e73558b88cba2adf29490d468 ]

Surprisingly, `block' in sector_t indicates the number of
i_blkbits-sized blocks rather than sectors for bmap.

In addition, considering buffer_head limits mapped size to 32-bits,
should avoid using generic_block_bmap.

Link: https://lore.kernel.org/r/20201209115740.18802-1-huangjianan@oppo.com
Fixes: 9da681e017a3 ("staging: erofs: support bmap")
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Huang Jianan <huangjianan@oppo.com>
Signed-off-by: Guo Weichao <guoweichao@oppo.com>
[ Gao Xiang: slightly update the commit message description. ]
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-12-30 11:53:46 +01:00
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