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-.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com>
-.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org>
-.\"
-.\" SPDX-License-Identifier: GPL-3.0-or-later
-.\"
-.TH proc_pid_mountinfo 5 (date) "Linux man-pages (unreleased)"
-.SH NAME
-/proc/pid/mountinfo \- mount information
-.SH DESCRIPTION
-.TP
-.IR /proc/ pid /mountinfo " (since Linux 2.6.26)"
-.\" This info adapted from Documentation/filesystems/proc.txt
-.\" commit 2d4d4864ac08caff5c204a752bd004eed4f08760
-This file contains information about mounts
-in the process's mount namespace (see
-.BR mount_namespaces (7)).
-It supplies various information
-(e.g., propagation state, root of mount for bind mounts,
-identifier for each mount and its parent) that is missing from the (older)
-.IR /proc/ pid /mounts
-file, and fixes various other problems with that file
-(e.g., nonextensibility,
-failure to distinguish per-mount versus per-superblock options).
-.IP
-The file contains lines of the form:
-.IP
-.EX
-36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 \- ext3 /dev/root rw,errors=continue
-(1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
-.EE
-.IP
-The numbers in parentheses are labels for the descriptions below:
-.RS 7
-.TP 5
-(1)
-mount ID: a unique ID for the mount (may be reused after
-.BR umount (2)).
-.TP
-(2)
-parent ID: the ID of the parent mount
-(or of self for the root of this mount namespace's mount tree).
-.IP
-If a new mount is stacked on top of a previous existing mount
-(so that it hides the existing mount) at pathname P,
-then the parent of the new mount is the previous mount at that location.
-Thus, when looking at all the mounts stacked at a particular location,
-the top-most mount is the one that is not the parent
-of any other mount at the same location.
-(Note, however, that this top-most mount will be accessible only if
-the longest path subprefix of P that is a mount point
-is not itself hidden by a stacked mount.)
-.IP
-If the parent mount lies outside the process's root directory (see
-.BR chroot (2)),
-the ID shown here won't have a corresponding record in
-.I mountinfo
-whose mount ID (field 1) matches this parent mount ID
-(because mounts that lie outside the process's root directory
-are not shown in
-.IR mountinfo ).
-As a special case of this point,
-the process's root mount may have a parent mount
-(for the initramfs filesystem) that lies
-.\" Miklos Szeredi, Nov 2017: The hidden one is the initramfs, I believe
-.\" mtk: In the initial mount namespace, this hidden ID has the value 0
-outside the process's root directory,
-and an entry for that mount will not appear in
-.IR mountinfo .
-.TP
-(3)
-major:minor: the value of
-.I st_dev
-for files on this filesystem (see
-.BR stat (2)).
-.TP
-(4)
-root: the pathname of the directory in the filesystem
-which forms the root of this mount.
-.TP
-(5)
-mount point: the pathname of the mount point relative
-to the process's root directory.
-.TP
-(6)
-mount options: per-mount options (see
-.BR mount (2)).
-.TP
-(7)
-optional fields: zero or more fields of the form "tag[:value]"; see below.
-.TP
-(8)
-separator: the end of the optional fields is marked by a single hyphen.
-.TP
-(9)
-filesystem type: the filesystem type in the form "type[.subtype]".
-.TP
-(10)
-mount source: filesystem-specific information or "none".
-.TP
-(11)
-super options: per-superblock options (see
-.BR mount (2)).
-.RE
-.IP
-Currently, the possible optional fields are
-.IR shared ,
-.IR master ,
-.IR propagate_from ,
-and
-.IR unbindable .
-See
-.BR mount_namespaces (7)
-for a description of these fields.
-Parsers should ignore all unrecognized optional fields.
-.IP
-For more information on mount propagation see
-.I Documentation/filesystems/sharedsubtree.rst
-(or
-.I Documentation/filesystems/sharedsubtree.txt
-before Linux 5.8)
-in the Linux kernel source tree.
-.SH SEE ALSO
-.BR proc (5)