Re: VM subsystem bug in 2.4.0 ?

[Linus Torvalds]

On 9 Jan 2001, Christoph Rohland wrote:

> Hi Stephen,
> 
> On Tue, 9 Jan 2001, Stephen C. Tweedie wrote:
> > D'oh, right --- so can't you lock a segment just by bumping
> > page_count on its pages?
> 
> Looks like a good idea. 
> 
> Oh, and my last posting was partly bogus: I can directly get the pages
> with page cache lookups on the file.

Even more appropriately, you have the inode->i_mapping lists that you can
use directly (no need to do lookups, just walk the list).

Note that bumping the counts is _NOT_ as easy as you seem to think. The
problem: vmtruncate() and friends. It's much easier to just have a flag
that gets cleared on truncate.

                Linus

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