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由 Al Viro 提交于
Do *NOT* skip doomed superblocks in btrfs_test_super(); we want sget() to wait for their shutdown to complete. Since we don't mutilate ->s_fs_info in ->put_super() anymore (or free what it used to point to until the superblock is past being findable by sget()), we can just DTRT there and report a match. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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