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| author | Karel Zak | 2018-07-19 11:41:31 +0200 |
|---|---|---|
| committer | Karel Zak | 2018-07-19 11:41:31 +0200 |
| commit | b6cc121043854e1048d020bc1d73d932df89eb4b (patch) | |
| tree | 74733c9d82c838ab11f1aecb7ff6b4af15ceadd5 /sys-utils/mount.8 | |
| parent | libmount: add since tag for new functions (diff) | |
| download | kernel-qcow2-util-linux-b6cc121043854e1048d020bc1d73d932df89eb4b.tar.gz kernel-qcow2-util-linux-b6cc121043854e1048d020bc1d73d932df89eb4b.tar.xz kernel-qcow2-util-linux-b6cc121043854e1048d020bc1d73d932df89eb4b.zip | |
mount: add details about mtab and --namespace to mount.8
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/mount.8')
| -rw-r--r-- | sys-utils/mount.8 | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/sys-utils/mount.8 b/sys-utils/mount.8 index a27fcf086..a04a11a67 100644 --- a/sys-utils/mount.8 +++ b/sys-utils/mount.8 @@ -238,11 +238,15 @@ and .B umount traditionally maintained a list of currently mounted filesystems in the file .IR /etc/mtab . -This real mtab file is still supported, but on current Linux systems it is -better to make it a symlink to +The support for regular classic +.IR /etc/mtab +is completely disabled in compile time by default, because on current Linux +systems it is better to make it a symlink to .I /proc/mounts -instead, because a regular mtab file maintained in userspace cannot reliably +instead. The regular mtab file maintained in userspace cannot reliably work with namespaces, containers and other advanced Linux features. +If the regular mtab support is enabled than it's possible to +use the file as well as the symlink. .sp If no arguments are given to .BR mount , @@ -648,6 +652,15 @@ is on a read-only filesystem. Perform mount in namespace specified by \fIns\fR. \fIns\fR is either PID of process running in that namespace or special file representing that namespace. +.sp +.BR mount (8) +switches to the namespace when it reads /etc/fstab, writes /etc/mtab (or writes to /run/mount) and calls +.BR mount(2) +system call, otherwise it runs in the original namespace. It means that the target namespace does not have +to contain any libraries or another requirements necessary to execute +.BR mount(2) +command. +.sp See \fBnamespaces\fR(7) for more information. .TP .BR \-O , " \-\-test\-opts " \fIopts @@ -2452,18 +2465,22 @@ to the mount.<suffix> helpers. All other options are used in a comma-separated list as argument to the \fB\-o\fR option. .SH FILES +See also "\fBThe files /etc/fstab, /etc/mtab and /proc/mounts\fR" section above. .TP 18n .I /etc/fstab filesystem table .TP +.I /run/mount +libmount private runtime directory +.TP .I /etc/mtab -table of mounted filesystems +table of mounted filesystems or symlink to /proc/mounts .TP .I /etc/mtab\s+3~\s0 -lock file +lock file (unused on systems with mtab symlink) .TP .I /etc/mtab.tmp -temporary file +temporary file (unused on systems with mtab symlink) .TP .I /etc/filesystems a list of filesystem types to try |