Tigran Aivazian wrote:
> Actually, the idea of union-ing things is probably broken anyway. Imagine
> clear_inode() is called on a pipe (because pipefs does iput(), e.g. from
> get_pipe_inode()):
>
> if (inode->i_bdev) {
> bdput(inode->i_bdev);
> inode->i_bdev = NULL;
> }
>
> in the union version, for a pipe, inode->i_bdev may well be not NULL and
> so bdput() will be called illegally. So, my yesterday's patch appears to
> be broken. (which is why I left Linus in cc to this message, I would not
> have wasted his time otherwise).
1. Make the name explicit: inode->i_union->bdev.
2. Change all the code that refers to the newly unioned fields.
It should be clear from the name i_union that no code should
read a field until it knows the type of the inode.
3. Do something similar for struct page. At least that would
remove the ugly overloading of page->next_hash fields on the Sparc.
-- Jamie
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This archive was generated by hypermail 2b29 : Tue Jul 25 2000 - 20:44:39 EDT