====== Proc - Mount Information ======

**/proc/<pid>/mountinfo** provides information about mounts.

This file contains lines of the form:

<code>
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)
</code>

where:

  * (1) mount ID:  unique identifier of the mount (may be reused after umount)
  * (2) parent ID:  ID of parent (or of self for the top of the mount tree)
  * (3) major:minor:  value of st_dev for files on filesystem
  * (4) root:  root of the mount within the filesystem
  * (5) mount point:  mount point relative to the process's root
  * (6) mount options:  per mount options
  * (7) optional fields:  zero or more fields of the form "tag[:value]"
  * (8) separator:  marks the end of the optional fields
  * (9) filesystem type:  name of filesystem of the form "type[.subtype]"
  * (10) mount source:  filesystem specific information or "none"
  * (11) super options:  per super block options

Parsers should ignore all unrecognised optional fields.  Currently the possible optional fields are:

  * **shared:X**  mount is shared in peer group X
  * **master:X**  mount is slave to peer group X
  * **propagate_from:X**  mount is slave and receives propagation from peer group X (*)
  * **unbindable**  mount is unbindable

where:

  * (*) X is the closest dominant peer group under the process's root.  If X is the immediate master of the mount, or if there's no dominant peer group under the same root, then only the **"master:X"** field is present and not the **"propagate_from:X"** field.


===== References =====

For more information on mount propagation see:

  Documentation/filesystems/sharedsubtree.txt