proc_pid_mountstats(5)

💖 /proc/pid/mountstats — mount statistics 💖

okay bestie, pull up a chair, this is the Linux proc_pid_mountstats(5) page and it's a short one but it's so useful 🫶

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✨ NAME ✨

/proc/pid/mountstats — literally just mount statistics, that's the whole vibe 💅

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🌸 DESCRIPTION 🌸

🦋 /proc/pid/mountstats (since Linux 2.6.17)

So this file (yes it's a file, not a dir, stay with me) exports info — statistics, configuration info, the whole little bundle — about the mounts inside the process's mount namespace. If you need a refresher on what a mount namespace even is, go check mount_namespaces(7), iykyk 💜

The lines in this file look like this:

device /dev/sda7 mounted on /home with fstype ext3 [stats]
(       1      )            ( 2 )             (3 ) (  4  )

and those little numbers underneath? they're a map, bestie. here's what each field means:

• (1) — the name of the mounted device. or, if there's no device behind it, it says "nodevice". iconic honestly 🌈
• (2) — the mount point, aka where it lives in the filesystem tree.
• (3) — the filesystem type.
• (4) — optional stats and configuration info. and this is the tea: currently (as at Linux 2.6.26), only NFS filesystems actually export anything through this field. everyone else leaves it empty 😭

heads up: this file is readable only by the owner of the process. no peeking, no cap 🔥

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👑 SEE ALSO 👑

• proc(5)

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star sign moment: this page is from Linux man-pages 6.20, dated 2026-02-08. periodt 💖✨🎀