[Bug 13320] file contents cause rsync to fail (with certains args and dir structure)

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=13320

--- Comment #3 from Dave Gordon <dg32768 at zoho.eu> ---
Problem introduced by
    commit f3873b3d88b61167b106e7b9227a20147f8f6197
    Author: Wayne Davison <wayned at samba.org>
    Date:   Mon Oct 10 11:49:50 2016 -0700

    Support --sparse combined with --preallocate or --inplace.

    The new code tries to punch holes in the destination file using newer
    Linux fallocate features. It also supports a --whole-file + --sparse +
    --inplace copy on any filesystem by truncating the destination file.

Root cause is that the new variable 'sparse_past_write' is not reset
when switching files, thus leading to miscalculation of the current
seek position in do_punch_hole().

Quick fix is to reset this variable to the current seek position on
each call to write_sparse() - probably not the most efficient fix,
but it seems to work.

.Dave.

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