@@ -3187,6 +3187,8 @@ 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;
}
@@ -330,7 +330,11 @@ typedef int __bitwise __kernel_rwf_t;
/* per-IO, return -EAGAIN if operation would block */
#define RWF_NOWAIT ((__force __kernel_rwf_t)0x00000008)
+/* per-IO O_APPEND */
+#define RWF_APPEND ((__force __kernel_rwf_t)0x00000010)
+
/* mask of flags supported by the kernel */
-#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT)
+#define RWF_SUPPORTED \
+ (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT | RWF_APPEND)
#endif /* _UAPI_LINUX_FS_H */
This is the per-I/O equivalent of O_APPEND to support atomic append operations on any open file. On Linux, 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> --- include/linux/fs.h | 2 ++ include/uapi/linux/fs.h | 6 +++++- 2 files changed, 7 insertions(+), 1 deletion(-)