fs: add RWF_APPEND
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>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6276f83..85c8ddc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3224,6 +3224,8 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
ki->ki_flags |= IOCB_DSYNC;
if (flags & RWF_SYNC)
ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
+ if (flags & RWF_APPEND)
+ ki->ki_flags |= IOCB_APPEND;
return 0;
}