https://bugzilla.kernel.org/show_bug.cgi?id=70121 Bug ID: 70121 Summary: Increasing efficiency of full data journaling Product: File System Version: 2.5 Kernel Version: 3.13.1 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: enhancement Priority: P1 Component: ext4 Assignee: fs_ext4@xxxxxxxxxxxxxxxxxxxx Reporter: sworddragon2@xxxxxxx Regression: No Full data journaling provides the ability that it is guaranteed that a file will never be saved visible for the user in a damaged state (except a hardware defect appears afterwards). But this has the disadvantage that the writing througput is ~halfed as all files are written 2 times. Here comes the idea: From a logical view to achieve this safety it is not needed to write the file 2 times. A simple committing should achieve the same level of safety. Here is an example: The filesystem could store a value for the file which is reflecting its state. It is initialized as empty value indicating the file has not successfully be written. As soon as the file has been written it is set to 1. This would avoid writing the file 2 times and still guarantee that the file will never be visible for te user in a damaged state on a crash as the filesystem check would see that the file state is unequal to 1 and correct the problem. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
