On 2012-02-05, at 10:23 AM, Eric Sandeen wrote: > On 2/5/12 10:55 AM, Andreas Dilger wrote: >> On 2012-02-05, at 9:36, Eric Sandeen <sandeen@xxxxxxxxxx> wrote: >>> On 2/5/12 3:33 AM, Ron Yorston wrote: >>>> Eric Sandeen wrote: >>>>> Now that ext4, xfs, & ocfs2 can support punch hole, a tool to >>>>> "re-sparsify" a file by punching out ranges of 0s might be in order. >>>>> >>>>> I'll see if util-linux wants it after it gets beat into shape. >>>>> (or did a tool like this already exist and I missed it?) >>> >>> Matthias' suggestion of adding SEEK_HOLE/SEEK_DATA makes very good sense too. >> >> I thought about this, but if SEEK_HOLE/SEEK_DATA (or FIEMAP) worked, >> then the file would already be sparse, so I don't think that will >> help in this case... > > But only if other tools originally used them, and there will probably be plenty > of cases where they don't, or legacy files, or .... I was thinking that the suggestion was to use SEEK_HOLE/SEEK_DATA to find the holes in the file... Of course, it makes a lot of sense if you use them to skip the existing holes, and only look for strings of zeros in the data parts... Cheers, Andreas -- 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
