I tried the verbose option, but it doesn't produce enough output.
> mkdir union a b
> mount -t aufs aufs union -o verbose,br:a=rw:b=rw
> cat > union/lock # in separate term
> mount union -o remount,del:a
[ 114.704254] aufs au_br_del:758:mount[1215]: 1 file(s) opened
mount: /tmp/union is busy
It doesn't produce any output for other operations.
> mount union -o remount,ro,mod:a=ro
mount: /tmp/union is busy
I recompiled and tried the sysrq, which produced hundreds of lines of
output (snippet of the "lock" file below)
> echo a > /proc/sysrq-trigger
[ 131.748018] aufs: files
[ 131.748018] f-1: mode 0x1e, flags 0100001, cnt 1, v 0, pos 0, mmapped 0
[ 131.748018] d-1: /?/lock, aufs, cnt 1, flags 0x0
[ 131.748018] i-1: i11, aufs, cnt 1, nl 1, 0100666, sz 0, blk 0, ct
4562, np 0, st 0x0, f 0x0, v 2, g 33601049
[ 131.748018] f0: mode 0x1e, flags 0100001, cnt 1, v 0, pos 0
[ 131.748018] d0: a?/lock, tmpfs, cnt 3, flags 0x0
[ 131.748018] i0: i1717, tmpfs, cnt 2, nl 1, 0100666, sz 0, blk 0, ct
4562, np 0, st 0x0, f 0x0, v 0, g 4c4cf59f
Well, I'm not happy with the answer, but I have to admit you did answer
my question.
I don't think I want to go down the route of parsing the output from a
debugging interface.
It'll be easier to kill and restart all the processes on the union when
a branch is locked.
Thanks again,
Lou
BTW, I have a simple perl script which shows the mounts, including aufs
branches, in a columnar layout.
If anyone wants it let me know; I'll clean it up and post it somewhere.
/ aufs rw,relatime,si=49b928fd /mnt/root=rw
/mnt/initrd=rr
/dev tmpfs rw,relatime,size=2048k tmpfs
/dev/pts devpts rw,relatime,mode=600 devpts
/dev/shm tmpfs rw,relatime,size=262144k tmpfs
/mnt/boot ext2 rw,relatime,errors=continue /dev/hda1
/mnt/initrd squashfs ro,relatime /dev/loop0
/mnt/root ext2 rw,relatime,errors=continue /dev/hda1
/proc proc rw,relatime proc
/sys sysfs rw,relatime sysfs
/tmp tmpfs rw,relatime,size=262144k tmpfs
/tmp/union aufs rw,relatime,si=4b0e66fd,verbose /tmp/a=rw
/tmp/b=rw
On 07/25/2010 07:57 PM, sf...@users.sourceforge.net wrote:
> Lou Gosselin:
>
>> How do I know which processes are locking a specific branch?
>>
> :::
>
>> # Any manipulation on the union results in locked file errors
>> > mount union -o remount,del:branch1
>> mount: /tmp/union is busy
>>
> How about the "verbose" option?
>
> (from the aufs manual)
> ----------------------------------------------------------------------
> .B verbose | v
> Print some information.
> Currently, it is only busy file (or inode) at deleting a branch.
> ----------------------------------------------------------------------
>
> If you enable AUFS_DEBUG and MAGIC_SYSRQ, then Magic SysRq + A will
> print the all opened files.
>
>
> J. R. Okajima
>
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