Messages in this thread | | | Date | Tue, 29 Jul 2003 16:08:23 +0200 | From | Andreas Haumer <> | Subject | 2.4.22-pre4: devfs on initrd stays busy after pivot_root |
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Hi!
Marcelo Tosatti wrote: > Hi, > > Here goes -pre4. It contains a lot of updates and fixes. > > We decided to include this new code quota code which allows usage of > quotas with 32bit UID/GIDs. > > Most Toshibas should work now due to an important ACPI fix. > > Please help and test. > Beginning with 2.4.22-pre4 I can't unmount devfs on my initial ramdisk anymore because of EBUSY
I use initrd and let the kernel mount devfs on /dev on boot. I then set up all the drivers needed to mount the real root device, do a "pivot_root" and continue with /sbin/init, just like it is described in Documentation/initrd.txt
When the boot process is finished, filesystems are mounted as follows:
root@install:~ {520} $ mount rootfs on / type rootfs (rw) /dev/root on /initrd type romfs (ro) none on /initrd/dev type devfs (rw) /dev/ide/host0/bus0/target0/lun0/part3 on / type ext2 (rw) devfs on /dev type devfs (rw) proc on /proc type proc (rw)
I then want to get rid of everything mounted under /initrd
root@install:~ {521} $ umount /initrd/dev umount: /initrd/dev: device is busy
This used to work just fine with 2.4.21 and 2.4.22-pre[123]
It does not work with 2.4.22-pre4 and 2.4.22-pre8 Also, with linux-2.4.21-ac4 unmounting /initrd/dev does not work.
I made a diff between pre3 and pre4 and some changes in fs/exec.c, fs/binfmt_elf.c and kernel/fork.c (around new function "unshare_files()") look suspicious to me. I find these changes in both 2.4.21-ac4 and 2.4.22-pre4 patchset (but I'm not a kernel hacker, so I might be wrong)
Any idea anyone?
- - andreas
- -- Andreas Haumer | mailto:andreas@xss.co.at *x Software + Systeme | http://www.xss.co.at/ Karmarschgasse 51/2/20 | Tel: +43-1-6060114-0 A-1100 Vienna, Austria | Fax: +43-1-6060114-71 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
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