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authorPádraig Brady <P@draigBrady.com>2014-10-02 14:07:42 +0100
committerPádraig Brady <P@draigBrady.com>2014-10-15 02:19:16 +0100
commit759b0ac9e7f3fbd0f04090e3142087bf692e47bc (patch)
treea3d72b4d1a25bec8fb4101e8baecf90ee1a28afa /m4/jm-macros.m4
parentcb4fc9356f9167f1f92d42a7550c5f5f170179c3 (diff)
downloadcoreutils-759b0ac9e7f3fbd0f04090e3142087bf692e47bc.tar.xz
copy: detect smaller holes than the copy buffer size
Previously cp would not detect runs of NULs that were smaller than the buffer size used for I/O (currently 128KiB). * src/copy.c (copy_reg): Use an independent hole_size, set to st_blksize, to increase the chances of detecting a representable hole, in a run of NULs read from the input. (create_hole): A new function refactored from sparse_copy() and extent_copy() so we have a single place to handle holes. (sparse_copy): Adjust to loop over the larger input buffer in chunks of the passed hole size. Also adjust to only call lseek once per hole, rather than at least once per input buffer. * tests/cp/sparse.sh: Add test cases for various sparse chunk sizes. * NEWS: Mention the improvement.
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