How to safely access inode/dentry obtained from struct page *?

[Valdis.Kletnieks at vt.edu]

On Sat, 30 Aug 2014 10:41:16 +0530, Joshi said:
> I am trying to obtain file name at block layer level (above IO scheduler).

Nope.  Won't work.  There is no single unique name for a file.

Consider:

touch a
ln a b

There's now 2 names for the same inode.

And why should the block level care about the file name, anyhow?  It doesn't
even know if it's a file or metadata... or even if there's a filesystem
on the partition at all.....
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