[ ssic-linux-Bugs-1949568 ] st_dev from stat(2) doesn't include node

Bugs item #1949568, was opened at 2008-04-23 07:37
Message generated for change (Comment added) made by rogertsang
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>Category: Filesystem
>Group: default
>Status: Closed
>Resolution: Wont Fix
>Priority: 1
Private: No
Submitted By: John Hughes (hughesj)
Assigned to: Nobody/Anonymous (nobody)
Summary: st_dev from stat(2) doesn't include node

Initial Comment:
Recipe for confusion.  Two nodes have identical hardware, they both have an identical filesystem on /dev/hda1.

Mount the two filesystems, and try to copy a file with the same inode# from one to another:

# onall grep hda1 /proc/mounts
(node 1)
/dev/1/hda1 /boot cfs rw,node=1 0 0
(node 2)
/dev/hda1 /mnt cfs rw,node=2 0 0
# ls -li /boot/grub/menu.lst /mnt/grub/menu.lst
46190 -rw-r--r-- 1 root root 4033 2008-04-22 15:18 /boot/grub/menu.lst
46190 -rw-r--r-- 1 root root 4033 2008-04-22 15:34 /mnt/grub/menu.lst
# cp /boot/grub/menu.lst /mnt/grub/menu.lst
cp: `/boot/grub/menu.lst' and `/mnt/grub/menu.lst' are the same file

Problem is that cp thinks they're the same file if they've got the same st_dev (which they do) and st_inode (which they do).

In this case it happened 'cos I copied the filesystem between the two nodes, but it could happen randomly if filesystems are mounted on more than one node.


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>Comment By: Roger Tsang (rogertsang)
Date: 2008-05-23 20:18

Message:
Logged In: YES 
user_id=1246761
Originator: NO

Not worth mucking with coreutils for something this rare plus we're not
going to touch VFS, ask the architect.  Can be worked around by sysadmin.

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