erofs-utils: support 64-bit internal buffer cache

Previously, the type of off in struct erofs_buffer_head
is unsigned int, it's not enough for large files.

Fix to a 64-bit field in order to support large files.

Reviewed-by: Li Guifu <blucerlee@gmail.com>
Tested-by: Li Guifu <blucerlee@gmail.com>
Link: https://lore.kernel.org/r/20191004204630.22696-1-hsiangkao@aol.com
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
3 files changed