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| author | Sukadev Bhattiprolu | 2009-01-16 07:41:42 +0100 |
|---|---|---|
| committer | Karel Zak | 2009-01-21 13:06:53 +0100 |
| commit | 22b51bd22dce0bcf0bb785ad8eaf491dd6f986dc (patch) | |
| tree | 2b8f5ef2bb5e8027f6ad48c63b31879e8124fc6b /mount/mount.8 | |
| parent | mount: cleans up mount(8) troff markup (diff) | |
| download | kernel-qcow2-util-linux-22b51bd22dce0bcf0bb785ad8eaf491dd6f986dc.tar.gz kernel-qcow2-util-linux-22b51bd22dce0bcf0bb785ad8eaf491dd6f986dc.tar.xz kernel-qcow2-util-linux-22b51bd22dce0bcf0bb785ad8eaf491dd6f986dc.zip | |
mount: document newinstance and ptmxmode options to devpts
Support for multiple instances of devpts were included in 2.6.29-rc1.
Update man pages to document the new options. Additional details about
the new options are described in 'Documentation/filesystems/devpts.txt'
of kernel source tree.
Reviewed-by: WANG Cong <wangcong@zeuux.org>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'mount/mount.8')
| -rw-r--r-- | mount/mount.8 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/mount/mount.8 b/mount/mount.8 index 956e10fad..e3eb81041 100644 --- a/mount/mount.8 +++ b/mount/mount.8 @@ -991,6 +991,61 @@ A value of and .B gid=5 makes "mesg y" the default on newly created PTYs. +.TP +\fBnewinstance +Create a private instance of devpts filesystem, such that +indices of ptys allocated in this new instance are +independent of indices created in other instances of devpts. + +All mounts of devpts without this +.B newinstance +option share the same set of pty indices (i.e legacy mode). +Each mount of devpts with the +.B newinstance +option has a private set of pty indices. + +This option is mainly used to support containers in the +linux kernel. It is implemented in linux kernel versions +starting with 2.6.29. Further, this mount option is valid +only if CONFIG_DEVPTS_MULTIPLE_INSTANCES is enabled in the +kernel configuration. + +To use this option effectively, +.IR /dev/ptmx +must be a symbolic link to +.IR pts/ptmx. +See +.IR Documentation/filesystems/devpts.txt +in the linux kernel source tree for details. +.TP +.BI ptmxmode= value + +Set the mode for the new +.IR ptmx +device node in the devpts filesystem. + +With the support for multiple instances of devpts (see +.B newinstance +option above), each instance has a private +.IR ptmx +node in the root of the devpts filesystem (typically +.IR /dev/pts/ptmx). + +For compatibility with older versions of the kernel, the +default mode of the new +.IR ptmx +node is 0000. +.BI ptmxmode= value +specifies a more useful mode for the +.IR ptmx +node and is highly recommended when the +.B newinstance +option is specified. + +This option is only implemented in linux kernel versions +starting with 2.6.29. Further this option is valid only if +CONFIG_DEVPTS_MULTIPLE_INSTANCES is enabled in the kernel +configuration. .SH "Mount options for ext" None. |