So far the read file system usage figures, read via the file system
interface classes using file system specific tools, have been checked to
the exact sector for:
0 <= used <= size
0 <= unused <= size
unallocated = 0
used + unused = size
However for JFS and NTFS this fails like this:
# ./test_SupportedFileSystems --gtest_filter='*ReadUsage/*' | fgrep ' ms'
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/btrfs (335 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/exfat (0 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/ext2 (38 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/ext3 (131 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/ext4 (32 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/f2fs (47 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/fat16 (19 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/fat32 (48 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/hfs (0 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/hfsplus (0 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/jfs, where GetParam() = 17 (73 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/linuxswap (20 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/luks (0 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/lvm2pv (410 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/minix (0 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/nilfs2 (226 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/ntfs, where GetParam() = 23 (56 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/reiser4 (49 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/reiserfs (139 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/udf (34 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndReadUsage/xfs (67 ms)
[----------] 21 tests from My/SupportedFileSystemsTest (1726 ms total)
[==========] 21 tests from 1 test case ran. (1726 ms total)
# ./test_SupportedFileSystems --gtest_filter='*ReadUsage/jfs:*ReadUsage/ntfs'
Running main() from test_SupportedFileSystems.cc
Note: Google Test filter = *ReadUsage/jfs:*ReadUsage/ntfs
[==========] Running 2 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 2 tests from My/SupportedFileSystemsTest
[ RUN ] My/SupportedFileSystemsTest.CreateAndReadUsage/jfs
test_SupportedFileSystems.cc:465: Failure
Expected equality of these values:
m_partition.sectors_unallocated
Which is: 2472
0
test_SupportedFileSystems.cc:517: Failure
Expected equality of these values:
m_partition.sectors_used + m_partition.sectors_unused
Which is: 521816
m_partition.get_sector_length()
Which is: 524288
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/jfs, where GetParam() = 17 (36 ms)
[ RUN ] My/SupportedFileSystemsTest.CreateAndReadUsage/ntfs
test_SupportedFileSystems.cc:465: Failure
Expected equality of these values:
m_partition.sectors_unallocated
Which is: 8
0
test_SupportedFileSystems.cc:517: Failure
Expected equality of these values:
m_partition.sectors_used + m_partition.sectors_unused
Which is: 524280
m_partition.get_sector_length()
Which is: 524288
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/ntfs, where GetParam() = 23 (35 ms)
[----------] 2 tests from My/SupportedFileSystemsTest (71 ms total)
[----------] Global test environment tear-down
[==========] 2 tests from 1 test case ran. (72 ms total)
[ PASSED ] 0 tests.
[ FAILED ] 2 tests, listed below:
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/jfs, where GetParam() = 17
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/ntfs, where GetParam() = 23
2 FAILED TESTS
So JFS is reporting 2472 unallocated sectors in a size of 524288 sectors
and NTFS is reporting 8 unallocated sectors in the same size. This
exact issue is already solved for GParted so that it doesn't show a
small amount of unallocated space by commits [1][2] from Bug 499202 [3].
Fix the same way, use the accessors to the file system usage figures
which don't show unallocated space when it is below the significant
threshold.
[1] b5c80f18a9
Enhance calculation of significant unallocated space (#499202)
[2] 7ebedc4bb3
Don't show intrinsic unallocated space (#499202)
[3] Bug 499202 - gparted does not see the difference if partition size
differs from filesystem size
https://bugzilla.gnome.org/show_bug.cgi?id=499202Closes!49 - Add file system interface tests
c15d0cd6aa