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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2019-07-30 13:47:12 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2019-09-23 13:11:19 +0200 |
| commit | fc2f474d77fbe64283ea233508bc86bb1b45e892 (patch) | |
| tree | 80c0c9a86a59482c71430a04efa9175a3eee10bd /man2 | |
| parent | b647c4c93a4fb4c21617d8dbb705d9ab14a8d6e5 (diff) | |
| download | man-pages-fc2f474d77fbe64283ea233508bc86bb1b45e892.tar.gz | |
pivot_root.2: Relocate details about kernel threads to NOTES
This text is a side point that somewhat distracts from the
flow in DESCRIPTION.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man2')
| -rw-r--r-- | man2/pivot_root.2 | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/man2/pivot_root.2 b/man2/pivot_root.2 index 3e16b430e9..3845e5f24d 100644 --- a/man2/pivot_root.2 +++ b/man2/pivot_root.2 @@ -52,14 +52,7 @@ changes the root directory and the current working directory of each process or thread in the same mount namespace to .I new_root if they point to the old root directory. -This is necessary in order to prevent kernel threads from keeping the old -root directory busy with their root and current working directory, -even if they never access -the filesystem in any way. -Perhaps one day there may be a mechanism for -kernel threads to explicitly relinquish any access to the filesystem, -such that this fairly intrusive mechanism can be removed from -.BR pivot_root (). +See also NOTES. .PP Note that this also applies to the calling process: .BR pivot_root () @@ -195,6 +188,19 @@ the current root of all relevant processes or threads. A modern use is to set up a root filesystem during the creation of a container. .PP +The fact that +.BR pivot_root () +modifies process root and current working directories in the +manner noted in DESCRIPTION +is necessary in order to prevent kernel threads from keeping the old +root directory busy with their root and current working directory, +even if they never access +the filesystem in any way. +Perhaps one day there may be a mechanism for +kernel threads to explicitly relinquish any access to the filesystem, +such that this fairly intrusive mechanism can be removed from +.BR pivot_root (). +.PP The rootfs (initial ramfs) cannot be .BR pivot_root ()ed. The recommended method of changing the root filesystem in this case is |