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    SubjectRe: [PATCH 1/2 v2] fs: add SEEK_HOLE and SEEK_DATA flags
    On 05/04/2011 03:31 PM, wrote:
    > On Wed, 04 May 2011 13:58:39 EDT, Josef Bacik said:
    >> +#define SEEK_HOLE 3 /* seek to the closest hole */
    >> +#define SEEK_DATA 4 /* seek to the closest data */
    > Comments here need nearest/next fixing as well - otherwise the ext[34] crew may
    > actually implement the commented semantics. ;)

    Balls, thanks I'll fix that.

    > Other than that, patch 1/2 looks OK to me (not that there's much code to
    > review), and 2/2 *seems* sane and implement the "next" semantics, though I only
    > examined the while/if structure and am assuming the btrfs innards are done
    > correctly. In particular, that 'while (1)' looks like it can be painful for a
    > sufficiently large and fragmented file (think a gigabyte file in 4K chunks,
    > producing a million extents), but I'll let a btrfs expert analyse that
    > performance issue ;)

    Heh well we do while (1) in btrfs _everywhere_, so this isn't anything
    new, tho I should probably throw a cond_resched() in there. Thanks,


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