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Create loop devices for BTRFS read file system interface tests (!49) 

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
This commit is contained in:
Mike Fleetwood 2019-10-09 13:35:17 +01:00 committed by Curtis Gedak
parent 268c34e398
commit 07ad43a107
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tests/test_SupportedFileSystems.cc
View File

@ -486,6 +486,7 @@ TEST_P(SupportedFileSystemsTest, CreateAndReadUsage)
{
SKIP_IF_FS_DOESNT_SUPPORT(create);
SKIP_IF_FS_DOESNT_SUPPORT(read);
SKIP_IF_NOT_ROOT_FOR_REQUIRED_LOOPDEV_FOR_FS(FS_BTRFS);
SKIP_IF_NOT_ROOT_FOR_REQUIRED_LOOPDEV_FOR_FS(FS_LVM2_PV);
extra_setup();
@ -514,6 +515,7 @@ TEST_P(SupportedFileSystemsTest, CreateAndReadLabel)
{
SKIP_IF_FS_DOESNT_SUPPORT(create);
SKIP_IF_FS_DOESNT_SUPPORT(read_label);
SKIP_IF_NOT_ROOT_FOR_REQUIRED_LOOPDEV_FOR_FS(FS_BTRFS);
SKIP_IF_NOT_ROOT_FOR_REQUIRED_LOOPDEV_FOR_FS(FS_LVM2_PV);
const char* fs_label = "TEST_LABEL";
@ -535,6 +537,7 @@ TEST_P(SupportedFileSystemsTest, CreateAndReadUUID)
{
SKIP_IF_FS_DOESNT_SUPPORT(create);
SKIP_IF_FS_DOESNT_SUPPORT(read_uuid);
SKIP_IF_NOT_ROOT_FOR_REQUIRED_LOOPDEV_FOR_FS(FS_BTRFS);
SKIP_IF_NOT_ROOT_FOR_REQUIRED_LOOPDEV_FOR_FS(FS_LVM2_PV);
extra_setup();