On Mon, Nov 6, 2017 at 10:43 PM, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote: > On Thu, Nov 02, 2017 at 10:38:08PM +0200, Amir Goldstein wrote: >> For the case of all layers not on the same fs, return the copy up origin >> inode st_dev/st_ino for non-dir from stat(2). >> >> This guaranties constant st_dev/st_ino for non-dir across copy up. >> Like the same fs case, st_ino of non-dir is also persistent. >> >> If the st_dev/st_ino for copied up object would have been the same as >> that of the real underlying lower file, running diff on underlying lower >> file and overlay copied up file would result in diff reporting that the >> two files are equal when in fact, they may have different content. >> >> Therefore, unlike the same fs case, st_dev is not persistent because it >> uses the unique anonymous bdev allocated for the lower layer. > > I have a stupid question. I thought st_dev is allocated dynamically and > is not persistent across reboot. Is that not the case? If yes, then > it is not persistent for same fs case as well. If yes, above does not > make sense. > True. That's a garbage text. Will delete it for v8. Thanks! Amir. -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
