| To: | Andreas Dilger <adilger@xxxxxxxxx> |
|---|---|
| Subject: | Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?) |
| From: | Theodore Tso <tytso@xxxxxxx> |
| Date: | Sat, 16 Apr 2011 08:21:28 -0400 |
| Cc: | Dave Chinner <david@xxxxxxxxxxxxx>, Pádraig Brady <P@xxxxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, "coreutils@xxxxxxx" <coreutils@xxxxxxx>, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx> |
| In-reply-to: | <E7438588-5C5A-42B9-9B6C-FADF7CAC6D3A@xxxxxxxxx> |
| References: | <20110414102608.GA1678@xxxxxxxxxxxxxx> <20110414120635.GB1678@xxxxxxxxxxxxxx> <20110414140222.GB1679@xxxxxxxxxxxxxx> <4DA70BD3.1070409@xxxxxxxxxxxxxx> <4DA717B2.3020305@xxxxxxxxxxx> <20110414225904.GK21395@dastard> <4DA7836A.5040604@xxxxxxxxxxxxxx> <20110415000940.GL21395@dastard> <76FFF648-CA02-494B-A862-566C66A8CB82@xxxxxxxxx> <20110416005040.GP21395@dastard> <E7438588-5C5A-42B9-9B6C-FADF7CAC6D3A@xxxxxxxxx> |
On Apr 16, 2011, at 1:11 AM, Andreas Dilger wrote: > In that case, it means cp should just always use FIEMAP_FLAG_SYNC, which is > fine. Except that if someone is copying a large delay allocated file, it will cause the file to immediately snapped to disk, which might not be the greatest thing in the world. Christoph is write, SEEK_HOLE and SEEK_DATA are a much better API for what cp woulld lke to do. Unfortunately it hasn't been implemented yet in the VFS... - Ted |
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