[Jan Kara - Fri, Jun 01, 2007 at 11:10:36PM +0200]
| On Wed 30-05-07 16:46:28, Eric Sandeen wrote:
| > Jan Kara wrote:
| > > Hello,
| > >
| > > On Thu 24-05-07 19:05:54, Jan Kara wrote:
| > >> Hello,
| > >>
| > >> attached is a patch that fixes possible leakage of free blocks / use of
| > >> free blocks in UDF (which spilled nice assertion failures I've added in my
| > >> first round of patches). More details in the changelog. Andrew, please apply.
| > >> Both changes have survived some time of fsx and fsstress testing so they
| > >> should be reasonably safe.
| > > Sorry for replying to myself but this patch had a minor problem of
| > > printing some bogus warnings when directories were deleted (I wonder why
| > > fsstress didn't find it). Attached is a new version of the patch without
| > > this problem.
| >
| > Jan, something seems busted here. I'm getting lockups when testing udf
| > on a single cpu with this last patch in place...
| Hmm, strange, I was also testing on UP and without problems. And I didn't
| change any locking...
|
| > I think it's the BKL stumbling on itself.
| >
| > for example...
| >
| > static int udf_symlink(struct inode * dir, struct dentry * dentry, const
| > char * symname)
| > {
| > ...
| > lock_kernel();
| > ...
| > out:
| > unlock_kernel();
| > return err;
| >
| > out_no_entry:
| > inode_dec_link_count(inode);
| > iput(inode);
| > goto out;
| > }
| >
| > but iput goes
| > iput->iput_final->drop_inode->udf_drop_inode->lock_kernel() again
| As Andrew already wrote, BKL is free to recurse...
|
| > looking for the right way around it but figured I'd ping you early :)
| Thanks for info - I'm now mostly out of email for a few days but I'll
| have a look at it as soon as I return.
|
| Honza
| --
| Jan Kara <[email protected]>
| SuSE CR Labs
|
Hi Jan,
why can't we combine udf_delete_inode() with udf_drop_inode()?
It'll avoid deadlock.
Cyrill
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