|
HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | DESCRIPTION | SEE ALSO | COLOPHON |
|
|
|
proc_pid_mountinfo(5) File Formats Manual proc_pid_mountinfo(5)
/proc/pid/mountinfo - mount information
/proc/pid/mountinfo (since Linux 2.6.26)
This file contains information about mounts in the
process's mount namespace (see 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) /proc/pid/mounts
file, and fixes various other problems with that file
(e.g., nonextensibility, failure to distinguish per-mount
versus per-superblock options).
The file contains lines of the form:
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)
The numbers in parentheses are labels for the descriptions
below:
(1) mount ID: a unique ID for the mount (may be reused
after umount(2)).
(2) parent ID: the ID of the parent mount (or of self for
the root of this mount namespace's mount tree).
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.)
If the parent mount lies outside the process's root
directory (see chroot(2)), the ID shown here won't
have a corresponding record in 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 mountinfo). As a special case of
this point, the process's root mount may have a parent
mount (for the initramfs filesystem) that lies outside
the process's root directory, and an entry for that
mount will not appear in mountinfo.
(3) major:minor: the value of st_dev for files on this
filesystem (see stat(2)).
(4) root: the pathname of the directory in the filesystem
which forms the root of this mount.
(5) mount point: the pathname of the mount point relative
to the process's root directory.
(6) mount options: per-mount options (see mount(2)).
(7) optional fields: zero or more fields of the form
"tag[:value]"; see below.
(8) separator: the end of the optional fields is marked by
a single hyphen.
(9) filesystem type: the filesystem type in the form
"type[.subtype]".
(10) mount source: filesystem-specific information or
"none".
(11) super options: per-superblock options (see mount(2)).
Currently, the possible optional fields are shared, master,
propagate_from, and unbindable. See mount_namespaces(7)
for a description of these fields. Parsers should ignore
all unrecognized optional fields.
For more information on mount propagation see
Documentation/filesystems/sharedsubtree.rst (or
Documentation/filesystems/sharedsubtree.txt before Linux
5.8) in the Linux kernel source tree.
proc(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.10 2024-05-02 proc_pid_mountinfo(5)
|
HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|