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| author | Jonathan Corbet <corbet@lwn.net> | 2020-06-26 11:35:10 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2020-06-26 11:35:10 -0600 |
| commit | 435a77434653faabcdf26c3d08c4fd25602c8613 (patch) | |
| tree | c123be30b03ba5614201b726143c7d3e6d500c98 /Documentation/filesystems | |
| parent | 0b227076d509c2facf177d7cdb67cbbb885cb661 (diff) | |
| parent | 4ac250814dfdc8606ac643283f26a63b0d5cbc73 (diff) | |
| download | linux-435a77434653faabcdf26c3d08c4fd25602c8613.tar.bz2 | |
Merge branch 'mauro' into docs-next
A big set of fixes and RST conversions from Mauro. He swears that this is
the last RST conversion set, which is certainly cause for celebration.
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/proc.rst | 44 |
1 files changed, 21 insertions, 23 deletions
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 53a0230a08e2..cc0fd2685562 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -2179,46 +2179,44 @@ subset=pid hides all top level files and directories in the procfs that are not related to tasks. 5 Filesystem behavior ----------------------------- +--------------------------- Originally, before the advent of pid namepsace, procfs was a global file system. It means that there was only one procfs instance in the system. When pid namespace was added, a separate procfs instance was mounted in each pid namespace. So, procfs mount options are global among all -mountpoints within the same namespace. - -:: +mountpoints within the same namespace:: -# grep ^proc /proc/mounts -proc /proc proc rw,relatime,hidepid=2 0 0 + # grep ^proc /proc/mounts + proc /proc proc rw,relatime,hidepid=2 0 0 -# strace -e mount mount -o hidepid=1 -t proc proc /tmp/proc -mount("proc", "/tmp/proc", "proc", 0, "hidepid=1") = 0 -+++ exited with 0 +++ + # strace -e mount mount -o hidepid=1 -t proc proc /tmp/proc + mount("proc", "/tmp/proc", "proc", 0, "hidepid=1") = 0 + +++ exited with 0 +++ -# grep ^proc /proc/mounts -proc /proc proc rw,relatime,hidepid=2 0 0 -proc /tmp/proc proc rw,relatime,hidepid=2 0 0 + # grep ^proc /proc/mounts + proc /proc proc rw,relatime,hidepid=2 0 0 + proc /tmp/proc proc rw,relatime,hidepid=2 0 0 and only after remounting procfs mount options will change at all -mountpoints. +mountpoints:: -# mount -o remount,hidepid=1 -t proc proc /tmp/proc + # mount -o remount,hidepid=1 -t proc proc /tmp/proc -# grep ^proc /proc/mounts -proc /proc proc rw,relatime,hidepid=1 0 0 -proc /tmp/proc proc rw,relatime,hidepid=1 0 0 + # grep ^proc /proc/mounts + proc /proc proc rw,relatime,hidepid=1 0 0 + proc /tmp/proc proc rw,relatime,hidepid=1 0 0 This behavior is different from the behavior of other filesystems. The new procfs behavior is more like other filesystems. Each procfs mount creates a new procfs instance. Mount options affect own procfs instance. It means that it became possible to have several procfs instances -displaying tasks with different filtering options in one pid namespace. +displaying tasks with different filtering options in one pid namespace:: -# mount -o hidepid=invisible -t proc proc /proc -# mount -o hidepid=noaccess -t proc proc /tmp/proc -# grep ^proc /proc/mounts -proc /proc proc rw,relatime,hidepid=invisible 0 0 -proc /tmp/proc proc rw,relatime,hidepid=noaccess 0 0 + # mount -o hidepid=invisible -t proc proc /proc + # mount -o hidepid=noaccess -t proc proc /tmp/proc + # grep ^proc /proc/mounts + proc /proc proc rw,relatime,hidepid=invisible 0 0 + proc /tmp/proc proc rw,relatime,hidepid=noaccess 0 0 |