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* libbtrfsutil: relax the privileges of subvolume iteratorOmar Sandoval2018-11-26
| | | | | | | | | | | | | We can use the new BTRFS_IOC_GET_SUBVOL_ROOTREF and BTRFS_IOC_INO_LOOKUP_USER ioctls to allow non-root users to list subvolumes. This is based on a patch from Misono Tomohiro but takes a different approach (mainly, this approach is more similar to the existing tree search approach). Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: relax the privileges of subvolume_info()Omar Sandoval2018-11-26
| | | | | | | | | | | | Attempt to use the BTRFS_IOC_GET_SUBVOL_INFO ioctl (added in kernel 4.18) for subvolume_info() if not root. Also, rename get_subvolume_info_root() -> get_subvolume_info_privileged() for consistency with further changes. This is based on a patch from Misono Tomohiro. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: allow tests to create multiple Btrfs instancesOmar Sandoval2018-11-26
| | | | | | | | Some upcoming tests will need to create a second Btrfs filesystem, so add support for this to the test helpers. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add test helpers for dropping privilegesOmar Sandoval2018-11-26
| | | | | | | | These will be used for testing some upcoming changes which allow unprivileged operations. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: use SubvolumeIterator as context manager in testsOmar Sandoval2018-11-26
| | | | | | | | We're leaking file descriptors, which makes it impossible to clean up the temporary mount point created by the test. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: change async parameters to async_ in Python bindingsOmar Sandoval2018-11-26
| | | | | | | | | | async became a keyword in Python 3.7, so, e.g., create_subvolume('foo', async=True) is now a syntax error. Fix it with the Python convention of adding a trailing underscore to the keyword (async -> async_). This is what several other Python libraries did to handle this. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: use top=0 as default for SubvolumeIterator()Omar Sandoval2018-11-26
| | | | | | | | | | Right now, we're defaulting to top=5 (i.e, all subvolumes). The documented default is top=0 (i.e, only beneath the given path). This is the expected behavior. Fix it and make the test cases cover it. Reported-by: Jonathan Lemon <bsd@fb.com> Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: fix test assumptions about top-level subvolumeOmar Sandoval2018-03-30
| | | | | | | | | | Since "btrfs-progs: mkfs: add uuid and otime to ROOT_ITEM of, FS_TREE", the top-level subvolume has a non-zero UUID, ctime, and otime. Fix the subvolume_info() test to not check for zero. Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: use local mkfs.btrfs for tests if it existsOmar Sandoval2018-03-30
| | | | | | | The system might not have mkfs installed at all. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_deleted_subvolumes()Omar Sandoval2018-03-06
| | | | | Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_delete_subvolume()Omar Sandoval2018-03-06
| | | | | | | We also support recursive deletion using a subvolume iterator. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_create_snapshot()Omar Sandoval2018-03-06
| | | | | | | | Thanks to subvolume iterators, we can also implement recursive snapshot fairly easily. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add subvolume iterator helpersOmar Sandoval2018-03-06
| | | | | | | | | | | | This is how we can implement stuff like `btrfs subvol list`. Rather than producing the entire list upfront, the iterator approach uses less memory in the common case where the whole list is not stored (O(max subvolume path length)). It supports both pre-order traversal (useful for, e.g, recursive snapshot) and post-order traversal (useful for recursive delete). Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_[gs]et_default_subvolume()Omar Sandoval2018-03-06
| | | | | | | | set_default_subvolume() is a trivial ioctl(), but there's no ioctl() for get_default_subvolume(), so we need to search the root tree. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_[gs]et_read_only()Omar Sandoval2018-03-06
| | | | | | | | | In the future, btrfs_util_[gs]et_subvolume_flags() might be useful, but since these are the only subvolume flags we've defined in all this time, this will do for now. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_subvolume_info()Omar Sandoval2018-03-06
| | | | | | | | This gets the the information in `btrfs subvolume show` from the root item. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_subvolume_path()Omar Sandoval2018-03-06
| | | | | | | | We can just walk up root backrefs with BTRFS_IOC_TREE_SEARCH and inode paths with BTRFS_IOC_INO_LOOKUP. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_create_subvolume()Omar Sandoval2018-03-06
| | | | | | | | Doing the ioctl() directly isn't too bad, but passing in a full path is more convenient than opening the parent and passing the path component. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add btrfs_util_is_subvolume() and btrfs_util_subvolume_id()Omar Sandoval2018-03-06
| | | | | | | | These are the most trivial helpers in the library and will be used to implement several of the more involved functions. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: fix Python testsOmar Sandoval2018-03-06
| | | | | | | These were broken when the patch series got shuffled around. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add filesystem sync helpersOmar Sandoval2018-02-24
| | | | | | | Namely, sync, start_sync, and wait_sync. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add qgroup inheritance helpersOmar Sandoval2018-02-24
| | | | | | | | | | We want to hide struct btrfs_qgroup_inherit from the user because that comes from the Btrfs UAPI headers. Instead, wrap it in a struct btrfs_util_qgroup_inherit and provide helpers to manipulate it. This will be used for subvolume and snapshot creation. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
* libbtrfsutil: add Python bindingsOmar Sandoval2018-02-24
The C libbtrfsutil library isn't very useful for scripting, so we also want bindings for Python. Writing unit tests in Python is also much easier than doing so in C. Only Python 3 is supported; if someone really wants Python 2 support, they can write their own bindings. This commit is just the scaffolding. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
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