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fs: fix FIEMAP_MAX_OFFSET type silliness in fiemap.h

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In fiemap.h the members of struct fiemap are declared as __u64, but the
FIEMAP_MAX_OFFSET macro is an unsigned long long value:

	$ grep FIEMAP_MAX_OFFSET -r /usr/include/
	/usr/include/linux/fiemap.h:#define FIEMAP_MAX_OFFSET   (~0ULL)
	$ grep fe_length -r /usr/include/
	/usr/include/linux/fiemap.h:    __u64 fe_length;   /* length in bytes for this extent */

This results in a type mismatch error on architectures like ppc64le:

	fiemap.cc:31:35: note:   deduced conflicting types for parameter 'const _Tp' ('long unsigned int' and 'long long unsigned int')
	    31 |                 fm.fm_length = min(fm.fm_length, FIEMAP_MAX_OFFSET - fm.fm_start);
	       |                                ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Work around this by copying the macro into a uint64_t constant,
and not using the macro any more.

Fixes: https://github.com/Zygo/bees/issues/194

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2021-10-06 15:05:28 -04:00
parent b436f8483b
commit 12e80658a8
2 changed files with 7 additions and 3 deletions
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6
include/crucible/fs.h
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@ -143,8 +143,12 @@ namespace crucible {
struct Fiemap : public fiemap {
// because fiemap.h insists on giving FIEMAP_MAX_OFFSET
// a different type from the struct fiemap members
static const uint64_t s_fiemap_max_offset = FIEMAP_MAX_OFFSET;
// Get entire file
Fiemap(uint64_t start = 0, uint64_t length = FIEMAP_MAX_OFFSET);
Fiemap(uint64_t start = 0, uint64_t length = s_fiemap_max_offset);
void do_ioctl(int fd);