Hi, It seems that overlayfs requires RENAME_WHITEOUT and RENAME_EXCHANGE. However, these two flags aren't currently supported in ubifs (or anything other than ext4, f2fs, and xfs). This causes any atomic renames to fail (e.g. using 'mv' command). I'm currently trying to implement these flags, but I'm having some issues as I'm pretty vanilla when it comes to implementation details on ubifs. I'm taking inspiration from patches [1] and [2], but I'm kind of coming up short. Is there anyone currently working on this? If not, I would certainly appreciate any advice for implementing these features. What I'm doing: I'm attempting to create a 'whiteout' object from within the ubifs_rename function. However, I noticed that it calls ubifs_jnl_rename, which is where I believe I should try to implement this. I haven't touched RENAME_EXCHANGE yet. [1] https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-4.4/110-jffs2-use-.rename2-and-add-RENAME_WHITEOUT-support.patch [2] https://dev.openwrt.org/browser/trunk/target/linux/generic/patches-4.4/111-jffs2-add-RENAME_EXCHANGE-support.patch Thanks, - Pushpal -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
