[Cluster-devel] [PATCH] Fix change nlink deadlock

[Wendy Cheng]

Bugzilla 215088

Fix deadlock in gfs2_change_nlink() while installing RHEL5 into GFS2 
partition. The gfs2_rename() apparently needs block allocation for the 
new name (into the directory) where it requires rg locks. At the same 
time, while updating the nlink count for the replaced file, 
gfs2_change_nlink() tries to return the inode meta-data back to resource 
group where it needs rg locks too. Our logic doesn't allow process to 
acquire these locks recursively by the same process  (RHEL installer) 
that results a BUG call. This only happens within rename code path and 
only if the destination file exists before the rename operation.

Patch passed a simulated test program created for this issue yesterday - 
havn't really tried it out on installer yet. Will continue to installer 
test today. Pass it up for a quick eyeball examine.

-- Wendy
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