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由 Al Viro 提交于
... returning -E... upon error and amount of data left in iter after (possible) truncation upon success. Note, that normal case gives a non-zero (positive) return value, so any tests for != 0 _must_ be updated. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk> Conflicts: fs/ext4/file.c
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