For BTRFS the read (and resize) tests fail when using an image file,
however the create, write and check tests pass. Selected output from
the test program:
$ ./test_SupportedFileSystems --gtest_filter='*/btrfs' | fgrep ' ms'
[ OK ] My/SupportedFileSystemsTest.Create/btrfs (43 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUsage/btrfs, where GetParam() = 7 (95 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadLabel/btrfs, where GetParam() = 7 (158 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndReadUUID/btrfs, where GetParam() = 7 (164 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndWriteLabel/btrfs (164 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndWriteUUID/btrfs (132 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndCheck/btrfs (129 ms)
[ OK ] My/SupportedFileSystemsTest.CreateAndRemove/btrfs (0 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndGrow/btrfs, where GetParam() = 7 (155 ms)
[ FAILED ] My/SupportedFileSystemsTest.CreateAndShrink/btrfs, where GetParam() = 7 (97 ms)
[----------] 10 tests from My/SupportedFileSystemsTest (1137 ms total)
[==========] 10 tests from 1 test case ran. (1137 ms total)
The read operations fail because 'btrfs filesystem show' doesn't work on
am image file:
$ truncate -s 256M test.img
$ mkfs.btrfs test.img
btrfs-progs v4.9.1
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: de1624ae-39bb-4796-aee4-7ee1fa24c06a
Node side: 16384
Sector size: 4096
Filesystem size: 256.00MiB
Block group profiles:
Data: single
Metadata: DUP
System: DUP
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 1
Devices:
ID SIZE PATH
1 256.00MiB test.img
$ btrfs filesystem show test.img
ERROR: not a valid btrfs filesystem: /home/centos/programming/c/gparted/tests/test.img
$ echo $1
1
Querying a BTRFS image file also fails as root:
$ su
Password:
# btrfs filesystem show test.img
ERROR: not a valid btrfs filesystem: /home/centos/programming/c/gparted/tests/test.img
# echo $1
1
However querying the BTRFS via a loop device succeeds:
# losetup --show --find test.img
/dev/loop0
# btrfs filesystem show /dev/loop0
Label: none uuid: de1624ae-39bb-4796-aee4-7ee1fa24c06a
Total devices 1 FS bytes used 112.00KiB
devid 1 size 256.00MiB used 88.00MiB path /root/test.img
There must be some kernel level BTRFS file system device discovery
happening because now after creating a loop device for the image file,
the BTRFS can be shown via the image file directly:
# btrfs filesystem show test.img
Label: none uuid: de1624ae-39bb-4796-aee4-7ee1fa24c06a
Total devices 1 FS bytes used 112.00KiB
devid 1 size 256.00MiB used 88.00MiB path /root/test.img
Anyway for the BTRFS reading tests make them required a loop device and
therefore root only. Now these tests are skipped as non-root user and
pass as root.
Addressing BTRFS resizing test failures will be handled in a following
commit.
Closes!49 - Add file system interface tests
07ad43a107