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SubjectRe: 2.6.0-test6-mm2
On Thu, Oct 02, 2003 at 09:04:32PM +0400, Nikita Danilov wrote:
> Andrew Morton writes:
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test6/2.6.0-test6-mm2/
> >
> > . A large series of VFS patches from Al Viro which replace usage of
> > file->f_dentry->d_inode->i_mapping with the new file->f_mapping.
> >
> > This is mainly so we can get disk hot removal right.
>
> What consequences does this have for (out-of-the-tree) file systems,
> beyond s/->f_dentry->d_inode->i_mapping/->f_mapping/g ?

None. It only matters for block device inodes. Out-of-tree fs is free to
do whatever it does with inodes of regular files/directories/etc.

In quite a few cases you can cut down on dereferencing that way, but that's
covered by what you've mentioned.

If you take a look at the patchset you'll see
* change of method prototypes in block devices (aka "you don't need
to start with bdev = inode->i_bdev, you get it from arguments" - check RD1--RD6
and you'll see)
* a lot of places in mm/* that got aforementioned search-and-replace
treatment
* very few changes in fs code, most of them of the same variety (same
search-and-replace)
* couple of helper functions changed their prototypes:
generic_write_checks() lost "inode" argument
generic_osync_inode(), OTOH, got explicit address_space one.
That's it.
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