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I want to find the mount options for /var. I can get a list of mounts and their options with mount. but how do I find the right one for a particular file? I could start with the filename (/var) and chip away at it until the directory matches a mount point, but is there already something that can do this?

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statvfs contains some options for any given file's path on the mounted filesystem in its f_flags member.

You can also parse /etc/mtab or /etc/fstab.

Beware of the listed options however, since some are just ignored by the kernel depending on the kernel config/options, and since you can't know what the kernel will do, you should limit to the minimum set of options.

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