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The commit "util: Do not clear parent mount flags when setting up namespaces" introduced a statvfs call read the flags of the original mount and have them applied to the bind mount. This has two problems: (1) The mount flags returned by statvfs(2) do not match the flags accepted by mount(2). For example, the value 4096 means ST_RELATIME when returned by statvfs(2), but means MS_BIND when passed to mount(2). (2) A call to statvfs blocks indefinitely when ran against a disconnected network drive ( https://github.com/systemd/systemd/issues/12667 ). We already use libmount to parse `/proc/self/mountinfo` but did not use the mount flag information from there. This patch changes that to use the mount flags parsed by libmount instead of calling statvfs. Only if getting the flags through libmount fails we call statvfs. Fixes https://github.com/systemd/systemd/issues/12667
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