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* extent-scan.h (extent_scan_free): Init the pointer to NULL,
and reset the count to 0, so that we can realloc the buffer.
* src/extent-scan.c (extent_scan_init): Likewise.
(extent_scan_read): Loop over multiple fiemap scans, so we handle
mergeable extents that span across fiemap scan boundaries. Once
we have enough unique extents, return so as to minimize memory use.
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* cfg.mk (sc_prohibit_strncmp): New rule, mostly from libvirt.
* src/system.h (STREQ_LEN, STRPREFIX, STRNCMP_LIT): Define.
* src/df.c (get_dev, get_point): Convert.
* src/extent-scan.c (extent_need_sync): Likewise.
* src/ls.c (is_colored, decode_switches): Likewise.
(parse_ls_color, (print_color_indicator): Likewise.
* src/md5sum.c (split_3): Likewise.
* src/split.c (main, emit_ancillary_info): Likewise.
* src/tr.c (look_up_char_class): Likewise.
* src/uname.c (main): Likewise.
* src/who.c (scan_entries): Likewise.
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* src/extent-scan.c (extent_need_sync): Require sync also for 2.6.38.
Without this, part of the cp/fiemap-empty test would fail both on
F15-to-be (2.6.38.1-6.fc15.x86_64) and rawhide. For details, see
http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/22190
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* src/extent-scan.c (extent_scan_read): Add a more stringent check
for OFF_T overflow, to ensure subsequent code is immune.
Detect overlapping extents and adjust, so as files always copied.
Detection using a single scan with fallback to a standard copy
was thought too expensive in memory or time.
* NEWS: Mention the fix
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* src/extent-scan.h (struct extent_scan): Add the fm_flags member to
pass to the fiemap scan.
* src/extent-scan.c (extent_need_sync): A new function used to
detect Linux kernels before 2.6.38.
(extent_scan_init): Add FIEMAP_FLAG_SYNC when needed.
* tests/cp/sparse-fiemap: Adjust comment.
* NEWS: Mention the change in behavior.
Indirectly suggested by Mike Frysinger
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* src/extent-scan.c (extent_scan_read): Merge adjacent extents
that vary only in size, so that we may process them more efficiently.
This will be especially useful when we introduce fallocate()
so that we don't reproduce fragmentation in the destination.
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* src/extent-scan.c (extent_scan_read) [!linux]: Always set
scan->initial_scan_failed so caller knows not to report the failure.
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* src/extent-scan.h: Update copyright year list.
* src/extent-scan.c: Likewise.
* tests/cp/sparse-fiemap: Likewise.
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* src/extent-scan.h [struct extent_scan]: Rename member:
s/hit_last_extent/hit_final_extent/. "final" is clearer,
since "last" can be interpreted as "preceding".
Rename extent-scan functions to start with extent_scan_.
* src/Makefile.am (copy_sources): Also distribute extent-scan.h.
* src/extent-scan.c: Don't include error.h or quote.h. Neither is used.
* src/copy.c: shorten a comment to fit in 80 columns
* src/extent-scan.c, src/extent-scan.h: Correct formatting.
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Changes:
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1. fix write_zeros() per Jim's comments.
2. remove char const *fname from struct extent_scan.
3. change the signature of open_extent_scan() from
"void open_extent_scan(struct extent_scan **scan)" to
"void open_extent_scan(struct extent_scan *scan)" to avoid having
to malloc the extent_scan variable; instead save it on the stack.
4. move close_extent_scan() from a function defined in extent-scan.c
to extent-scan.h as a macro definition, but it does nothing for now,
since initial extent scan defined at stack.
5. add a macro "free_extents_info()" defined at extent-scan.h to
release the memory allocated to extent info which should be called
combine with get_extents_info(), it just one line, so IMHO, define
it as macro should be ok.
* src/extent-scan.c: New file; functions to read "extents".
* src/extent-scan.h: Header file of extent-scan.c.
* src/Makefile.am: Reference it and link it to copy_source.
* src/copy.c: Use the new functions and avoid double-free.
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