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5c08f76951
Closes: https://bugs.gentoo.org/908452 Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com> Closes: https://github.com/gentoo/gentoo/pull/31416 Signed-off-by: Sam James <sam@gentoo.org>
59 lines
2.9 KiB
Diff
59 lines
2.9 KiB
Diff
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Patch from:
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https://github.com/knorrie/python-btrfs/commit/be867c10e30b7d8e4d3cfd939a433cc19f362966
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From be867c10e30b7d8e4d3cfd939a433cc19f362966 Mon Sep 17 00:00:00 2001
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From: Hans van Kranenburg <hans@knorrie.org>
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Date: Sun, 21 May 2023 18:40:28 +0200
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Subject: [PATCH] WIP ctree: FileSystem: add block_groups function
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In the past, I did not really want to add this helper function, since
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it's not just translating some function parameters to another function
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call, but, to get all Block Group objects, we needed to search the Chunk
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tree and get all of them individually. So, to make it more explicit to
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the user of the library that it was a bit weird inefficient process, I
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let the user do that little dance.
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Now, with the new Block Group Tree, we can actually just to a cheap
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lookup of a Block Group range! So, well, let's add the convenience
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function now, and let it handle both the old and new case.
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Note that the difference in behaviour between error handling for looking
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up a range or a single items stays the same. block_groups(...) will
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return an iterator which has no objects to produce, and block_group(...)
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will throw the ItemNotFoundError.
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--- a/btrfs/ctree.py
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+++ b/btrfs/ctree.py
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@@ -866,6 +866,31 @@ def dev_extents(self, min_devid=1, max_devid=ULLONG_MAX):
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for header, data in btrfs.ioctl.search_v2(self.fd, tree, min_key, max_key):
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yield DevExtent(header, data)
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+ def block_groups(self, min_vaddr=0, max_vaddr=ULLONG_MAX, nr_items=None):
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+ """
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+ :param int min_vaddr: Lowest virtual address to search for.
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+ :param int max_vaddr: Highest virtual address to search for.
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+ :param int nr_items: Maximum amount of items to return. Defaults to no limit.
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+ :returns: Block Group items from the Extent Tree or Block Group Tree
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+ :rtype: Iterator[:class:`~btrfs.ctree.BlockGroupItem`]
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+ """
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+ if not self._block_group_tree:
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+ for chunk in self.chunks(min_vaddr, max_vaddr, nr_items):
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+ try:
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+ yield self.block_group(chunk.vaddr, chunk.length)
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+ except btrfs.ctree.ItemNotFoundError:
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+ # This is simply to prevent the program from aborting when a block
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+ # group is removed in between doing the chunks lookup and the block
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+ # group item lookup.
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+ pass
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+ else:
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+ tree = BLOCK_GROUP_TREE_OBJECTID
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+ min_key = Key(min_vaddr, BLOCK_GROUP_ITEM_KEY, 0)
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+ max_key = Key(max_vaddr, BLOCK_GROUP_ITEM_KEY, ULLONG_MAX)
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+ for header, data in btrfs.ioctl.search_v2(self.fd, tree, min_key, max_key,
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+ nr_items=nr_items):
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+ yield BlockGroupItem(header, data)
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+
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def block_group(self, vaddr, length=None):
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"""
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:param int vaddr: Starting virtual address of the block group.
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