Re: [PATCH-2.5.13] NTFS 2.0.6 Bugfix/adapt to 2.5.12 changes

[Andrew Morton <akpm@zip.com.au>]

Anton Altaparmakov wrote:
> 
> Hi,
> 
> I have just sent the below NTFS update to Linus for inclusion. Andrew
> Morton's changes to 2.5.12 broke NTFS because they added fields to
> struct address_space which ntfs obviously wasn't initializing...

Sorry about that, Chief.  ra_pages, presumably.  That's one
which *has* to be initialised.

I've added quite a lot of "if you didn't provide one then I'll 
do the default" code, but that's an interim step - later, all
the address_spaces need to be populated with the right stuff.

> ...
> +       /* Initialize the mftbmp address space mapping.  */
> +       INIT_RADIX_TREE(&vol->mftbmp_mapping.page_tree, GFP_ATOMIC);
> +       rwlock_init(&vol->mftbmp_mapping.page_lock);
> +       INIT_LIST_HEAD(&vol->mftbmp_mapping.clean_pages);
> +       INIT_LIST_HEAD(&vol->mftbmp_mapping.dirty_pages);
> +       INIT_LIST_HEAD(&vol->mftbmp_mapping.locked_pages);
> +       INIT_LIST_HEAD(&vol->mftbmp_mapping.io_pages);
> +       vol->mftbmp_mapping.nrpages = 0;
> +       vol->mftbmp_mapping.a_ops = NULL;
> +       vol->mftbmp_mapping.host = NULL;
> +       INIT_LIST_HEAD(&vol->mftbmp_mapping.i_mmap);
> +       INIT_LIST_HEAD(&vol->mftbmp_mapping.i_mmap_shared);
> +       spin_lock_init(&vol->mftbmp_mapping.i_shared_lock);
> +       vol->mftbmp_mapping.dirtied_when = 0;
> +       vol->mftbmp_mapping.gfp_mask = GFP_HIGHUSER;

That's all generic code.   It's initialising core
kernel fields.  If should be done in the core kernel.

It would be better to split the address_space initialisation
parts out of inode_init_once(), and export the new function...

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