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ext4: update the s_last_mounted field in the superblock
This field can be very helpful when a system administrator is trying to sort through large numbers of block devices or filesystem images. What is stored in this field can be ambiguous if multiple filesystem namespaces are in play; what we store in practice is the mountpoint interpreted by the process's namespace which first opens a file in the filesystem. Signed-off-by: "Theodore Ts'o" <firstname.lastname@example.org>
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