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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
Download Patch File Download Diff File Expand all files Collapse all files

6
include/crucible/fs.h
View File

@ -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);

4
src/fiemap.cc
View File

@ -28,13 +28,13 @@ main(int argc, char **argv)
if (argc > 2) { fm.fm_start = stoull(argv[2], nullptr, 0); }
if (argc > 3) { fm.fm_length = stoull(argv[3], nullptr, 0); }
if (argc > 4) { fm.fm_flags = stoull(argv[4], nullptr, 0); }
fm.fm_length = min(fm.fm_length, FIEMAP_MAX_OFFSET - fm.fm_start);
fm.fm_length = min(fm.fm_length, Fiemap::s_fiemap_max_offset - fm.fm_start);
uint64_t stop_at = fm.fm_start + fm.fm_length;
uint64_t last_byte = fm.fm_start;
do {
fm.do_ioctl(fd);
// cerr << fm;
uint64_t last_logical = FIEMAP_MAX_OFFSET;
uint64_t last_logical = Fiemap::s_fiemap_max_offset;
for (auto &extent : fm.m_extents) {
if (extent.fe_logical > last_byte) {
cout << "Log " << to_hex(last_byte) << ".." << to_hex(extent.fe_logical) << " Hole" << endl;