Re: [Bug-tar] [PATCH] Remove nonportable check for files containing only zeroes

[Joerg Schilling]

Mark H Weaver <address@hidden> wrote:

> > Now many bytes have been written past the hole?
>
> Did you read my entire message?  The answer to your question was just a
> few lines beyond the excerpt that you quoted above.  I wrote:
>
> >> Yes, on Btrfs I reliably see (st_blocks == 0) on a recently written,
> >> mostly sparse file with size > 8G, using linux-libre-4.14.14.  More
> >> specifically, the "storing sparse files > 8G" test in tar's test suite
> >> reliably fails on my system:
> >> 
> >>   140: storing sparse files > 8G                       FAILED 
> >> (sparse03.at:29)
> >> 
> >> The test creates a sparse file consisting of 8 gibibytes of hole
> >> followed by 512 bytes of 'A's at the end.  [...]

Sorry, I did not see this.

Well then it would be of interest whether btrfs is able to keep 512 bytes of 
data in the meta data space.

Jörg

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