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Date: Sun, 5 Feb 2012 18:23:02 +0100 From: Matthias Schniedermeyer <ms@...d.de> To: Andreas Dilger <adilger@...ger.ca> Cc: Eric Sandeen <sandeen@...hat.com>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, Ron Yorston <rmy@...ress.co.uk>, "xfs@....sgi.com" <xfs@....sgi.com> Subject: Re: sparsify - utility to punch out blocks of 0s in a file On 05.02.2012 09:55, Andreas Dilger wrote: > > 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... With that argumentation you wouldn't need the tool in the first place. "How can a bunch of zeros be in a file in the first place?" "Can only be because of the deficiency of another program." And who is to say that you wouldn't want to repeat such a thing from time to time, without SEEK_HOLE/SEEK_DATE you MAY crunch through big regions of zeros for no gain at all. Bis denn -- Real Programmers consider "what you see is what you get" to be just as bad a concept in Text Editors as it is in women. No, the Real Programmer wants a "you asked for it, you got it" text editor -- complicated, cryptic, powerful, unforgiving, dangerous. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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