lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 13 Jan 2016 10:44:11 +0100 From: Jan Kara <jack@...e.cz> To: Ross Zwisler <ross.zwisler@...ux.intel.com> Cc: linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, "J. Bruce Fields" <bfields@...ldses.org>, Theodore Ts'o <tytso@....edu>, Alexander Viro <viro@...iv.linux.org.uk>, Andreas Dilger <adilger.kernel@...ger.ca>, Andrew Morton <akpm@...ux-foundation.org>, Dan Williams <dan.j.williams@...el.com>, Dave Chinner <david@...morbit.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, Jan Kara <jack@...e.com>, Jeff Layton <jlayton@...chiereds.net>, Matthew Wilcox <matthew.r.wilcox@...el.com>, Matthew Wilcox <willy@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, linux-nvdimm@...ts.01.org, x86@...nel.org, xfs@....sgi.com Subject: Re: [PATCH v8 4/9] dax: support dirty DAX entries in radix tree On Thu 07-01-16 22:27:54, Ross Zwisler wrote: > Add support for tracking dirty DAX entries in the struct address_space > radix tree. This tree is already used for dirty page writeback, and it > already supports the use of exceptional (non struct page*) entries. > > In order to properly track dirty DAX pages we will insert new exceptional > entries into the radix tree that represent dirty DAX PTE or PMD pages. > These exceptional entries will also contain the writeback sectors for the > PTE or PMD faults that we can use at fsync/msync time. > > There are currently two types of exceptional entries (shmem and shadow) > that can be placed into the radix tree, and this adds a third. We rely on > the fact that only one type of exceptional entry can be found in a given > radix tree based on its usage. This happens for free with DAX vs shmem but > we explicitly prevent shadow entries from being added to radix trees for > DAX mappings. > > The only shadow entries that would be generated for DAX radix trees would > be to track zero page mappings that were created for holes. These pages > would receive minimal benefit from having shadow entries, and the choice > to have only one type of exceptional entry in a given radix tree makes the > logic simpler both in clear_exceptional_entry() and in the rest of DAX. > > Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com> > Reviewed-by: Jan Kara <jack@...e.cz> I have realized there's one issue with this code. See below: > @@ -34,31 +35,39 @@ static void clear_exceptional_entry(struct address_space *mapping, > return; > > spin_lock_irq(&mapping->tree_lock); > - /* > - * Regular page slots are stabilized by the page lock even > - * without the tree itself locked. These unlocked entries > - * need verification under the tree lock. > - */ > - if (!__radix_tree_lookup(&mapping->page_tree, index, &node, &slot)) > - goto unlock; > - if (*slot != entry) > - goto unlock; > - radix_tree_replace_slot(slot, NULL); > - mapping->nrshadows--; > - if (!node) > - goto unlock; > - workingset_node_shadows_dec(node); > - /* > - * Don't track node without shadow entries. > - * > - * Avoid acquiring the list_lru lock if already untracked. > - * The list_empty() test is safe as node->private_list is > - * protected by mapping->tree_lock. > - */ > - if (!workingset_node_shadows(node) && > - !list_empty(&node->private_list)) > - list_lru_del(&workingset_shadow_nodes, &node->private_list); > - __radix_tree_delete_node(&mapping->page_tree, node); > + > + if (dax_mapping(mapping)) { > + if (radix_tree_delete_item(&mapping->page_tree, index, entry)) > + mapping->nrexceptional--; So when you punch hole in a file, you can delete a PMD entry from a radix tree which covers part of the file which still stays. So in this case you have to split the PMD entry into PTE entries (probably that needs to happen up in truncate_inode_pages_range()) or something similar... Honza -- Jan Kara <jack@...e.com> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists