On Sat, Jan 17, 2026 at 12:21:16AM +0800, Gao Xiang wrote: > Hi Christoph, > > On 2026/1/16 23:46, Christoph Hellwig wrote: >> I don't really understand the fingerprint idea. Files with the >> same content will point to the same physical disk blocks, so that >> should be a much better indicator than a finger print? Also how does > > Page cache sharing should apply to different EROFS > filesystem images on the same machine too, so the > physical disk block number idea cannot be applied > to this.
Oh. That's kinda unexpected and adds another twist to the whole scheme. So in that case the on-disk data actually is duplicated in each image and then de-duplicated in memory only? Ewwww...
