Subject: +
mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch added
to -mm tree
To: [email protected],[email protected]
From: [email protected]
Date: Wed, 05 Feb 2014 13:37:52 -0800
The patch titled
Subject: mm: __set_page_dirty uses spin_lock_irqsave instead of
spin_lock_irq
has been added to the -mm tree. Its filename is
mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
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------------------------------------------------------
From: KOSAKI Motohiro <[email protected]>
Subject: mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq
To use spin_{un}lock_irq is dangerous if caller disabled interrupt.
During aio buffer migration, we have a possibility to see the following
call stack.
aio_migratepage [disable interrupt]
migrate_page_copy
clear_page_dirty_for_io
set_page_dirty
__set_page_dirty_buffers
__set_page_dirty
spin_lock_irq
This mean, current aio migration is a deadlockable. spin_lock_irqsave is
a safer alternative and we should use it.
Signed-off-by: KOSAKI Motohiro <[email protected]>
Reported-by: David Rientjes [email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
fs/buffer.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN
fs/buffer.c~mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq
fs/buffer.c
---
a/fs/buffer.c~mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq
+++ a/fs/buffer.c
@@ -654,14 +654,16 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
static void __set_page_dirty(struct page *page,
struct address_space *mapping, int warn)
{
- spin_lock_irq(&mapping->tree_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&mapping->tree_lock, flags);
if (page->mapping) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
- spin_unlock_irq(&mapping->tree_lock);
+ spin_unlock_irqrestore(&mapping->tree_lock, flags);
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
}
_
Patches currently in -mm which might be from [email protected] are
mm-__set_page_dirty_nobuffers-uses-spin_lock_irqseve-instead-of-spin_lock_irq.patch
mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
mm-vmstat-fix-up-zone-state-accounting.patch
fs-cachefiles-use-add_to_page_cache_lru.patch
lib-radix-tree-radix_tree_delete_item.patch
mm-shmem-save-one-radix-tree-lookup-when-truncating-swapped-pages.patch
mm-filemap-move-radix-tree-hole-searching-here.patch
mm-fs-prepare-for-non-page-entries-in-page-cache-radix-trees.patch
mm-fs-store-shadow-entries-in-page-cache.patch
mm-thrash-detection-based-file-cache-sizing.patch
lib-radix_tree-tree-node-interface.patch
mm-keep-page-cache-radix-tree-nodes-in-check.patch
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