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Diffstat (limited to 'util-linux/Config.in')
| -rw-r--r-- | util-linux/Config.in | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/util-linux/Config.in b/util-linux/Config.in index dc6d8fdad..fe71dac2c 100644 --- a/util-linux/Config.in +++ b/util-linux/Config.in @@ -288,6 +288,28 @@ config CONFIG_PIVOT_ROOT of wild and crazy things with your Linux system and is far more powerful than 'chroot'. + Note: This is for initrd in linux 2.4. Under initramfs (introduced + in linux 2.6) use switch_root instead. + +config CONFIG_SWITCH_ROOT + bool "switch_root" + default n + help + The switch_root utility is used from initramfs to select a new + root device. Under initramfs, you have to use this instead of + pivot_root. (Stop reading here if you don't care why.) + + Booting with initramfs extracts a gzipped cpio archive into rootfs + (which is a variant of ramfs/tmpfs). Because rootfs can't be moved + or unmounted*, pivot_root will not work from initramfs. Instead, + switch_root deletes everything out of rootfs (including itself), + does a mount --move that overmounts rootfs with the new root, and + then execs the specified init program. + + * Because the Linux kernel uses rootfs internally as the starting + and ending point for searching through the kernel's doubly linked + list of active mount points. That's why. + config CONFIG_RDATE bool "rdate" default n |