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This is the per-I/O equivalent of O_APPEND to support atomic append operations on any open file. If a file is opened with O_APPEND, pwrite() ignores the offset and always appends data to the end of the file. RWF_APPEND enables atomic append and pwrite() with offset on a single file descriptor. Signed-off-by: Jürg Billeter <j@bitron.ch> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>