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40fe89c6e8
According to fsync specification [1] some special files (e.g., a pipe, FIFO, or socket) don't support synchronization and return either EROFS or EINVAL. On the linux side the sys_fsync -> do_fsync() checks if the requested file has f_op->fsync defined. If not it returns EINVAL [2]. This commit prevents writing error messages for files (devices), which do not support fsync(). [1] - http://man7.org/linux/man-pages/man2/fsync.2.html [2] - http://elixir.free-electrons.com/linux/v4.13-rc6/source/fs/sync.c#L183 Signed-off-by: Lukasz Majewski <lukma@denx.de> Acked-by: Michael Heimpold <mhei@heimpold.de>