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* src/copy-file-data.c (lseek_copy): hole_start is initialized
only when ext_start == ipos.
(infer_scantype): Update the hole_start initialization to
the more logically correct POS, even though that init
is only needed to suppress a -Wmaybe-uninitialized warning.
Note gcc 15.2 at least doesn't seem to need that suppression.
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* src/copy-file-data.c (copy_file_data): Only give the
POSIX_FADV_SEQUENTIAL hint when we _know_ we'll definitely
use a read/write loop to copy the data. Also only apply
the hint to the whole file, as we've seen OpenZFS at least
special case that.
(sparse_copy): Update stale comment.
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* src/copy-file-data.c (infer_scantype): Fall back to a plain copy
if SEEK_HOLE indicates non-sparse, as zero copy avoids copy offload.
This was seen with transparently compressed files on OpenZFS.
* tests/cp/sparse-perf.sh: Add a test case even though it might
only trigger on compressed file systems that don't support reflink.
* NEWS: Mention the bug fix.
Addresses https://github.com/coreutils/coreutils/issues/122
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* src/copy-file-data.c (): pass 0 to posix_fadvise to indicate to EOF.
coreutils 9.8 used OFF_T_MAX instead, which triggered OpenZFS 2.2.2
at least to synchronously (decompress and) populate the page cache.
Addresses https://github.com/coreutils/coreutils/issues/122
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* src/copy-file-data.c (copy_file_data):
Redo conditionals for clarity.
This pacifies the clang in FreeBSD 11 and OpenBSD 7.6.
Problem reported by Bruno Haible in:
https://lists.gnu.org/r/coreutils/2025-09/msg00104.html
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* cfg.mk: Avoid spellcheck failures.
* src/copy-file-data.c: Avoid sc_tight_scope and long_lines failure.
* src/copy.h: Avoid indentation issues.
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* src/copy-file-data.c (create_hole): Refactor by returning
resulting offset, not bool. All callers changed.
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* src/copy-file-data.c (sparse_copy, lseek_copy)
(copy_file_data): Prefer idx_t to size_t.
(copy_file_data): Defend against st_size < 0, which can happen on
ancient buggy platforms. Check for overflow; the old code was
wrong on theoretical-but-valid hosts where SIZE_MAX <= INT_MAX.
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* src/copy-file-data.c (write_zeros): New args abuf, buf_size.
Use the lazily-allocated buffer, which most likely already exists,
rather than allocating a separate buffer just for zeros.
This makes the code more reentrant as there is no longer
a need for static storage here. Although there is some CPU
overhead due to the need to zero out the buffer for each file,
the overhead is relatively small as the buffer is smallish
and should be cached. All callers changed.
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This doesn’t change behavior; it simplifies future changes.
* src/copy-file-data.c (sparse_copy, lseek_copy, copy_file_data):
Return the number of bytes copied, or -1 on failure,
instead of merely returning a success indication.
All callers changed.
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This does not affect current coreutils behavior;
it is merely to help make copy_file_data more useful in the future.
* src/copy-file-data.c (lseek_copy): New arg ibytes.
Caller changed.
(copy_file_data): Implement the ibytes arg; formerly
it was always treated as COUNT_MAX, though all callers
currently pass COUNT_MAX so there was no problem in practice.
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* src/copy-file-data.c (sparse_copy): max_n_read arg is now
of type count_t, not uintmax_t. This is better for debugging
with -fsanitize=undefined.
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Port better ancient platforms where OFF_T_MAX is only 2**31 - 1,
but some devices have more than that many bytes.
* src/copy-file-data.c (copy_file_data): Byte count is now
count_t, not off_t. All callers changed. Since we need to check
for overflow anyway, also check for too-small calls to fadvise.
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* po/POTFILES.in, src/local.mk (copy_sources): Add the new file.
* src/copy.c: Move the #includes of alignalloc.h, buffer-lcm.h,
fadvise.h, full-write.h, ioblksize.h to copy-file-data.c.
(enum copy_debug_val, struct copy_debug): Move these decls to copy.h.
(punch_hole, create_hole, is_CLONENOTSUP, sparse_copy)
(write_zeros, lseek_copy, HAVE_STRUCT_STAT_ST_BLOCKS)
(enum scantype, struct scan_inference, infer_scantype):
Move to copy-file-data.c.
(copy_reg): Move the data-copying part of this function
to the new function copy_file_data in copy-file-data.c.
* src/copy-file-data.c: New file, taken from part of copy.c.
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