diff options
Diffstat (limited to 'fs/btrfs/extent_io.c')
| -rw-r--r-- | fs/btrfs/extent_io.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 5368e3b6eb96..1cf4baba4342 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2649,9 +2649,24 @@ static inline struct page *extent_buffer_page(struct extent_buffer *eb, mapping = eb->first_page->mapping; if (!mapping) return NULL; + + /* + * extent_buffer_page is only called after pinning the page + * by increasing the reference count. So we know the page must + * be in the radix tree. + */ +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) + rcu_read_lock(); +#else read_lock_irq(&mapping->tree_lock); +#endif p = radix_tree_lookup(&mapping->page_tree, i); + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) + rcu_read_unlock(); +#else read_unlock_irq(&mapping->tree_lock); +#endif return p; } @@ -2843,13 +2858,21 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree, } } clear_page_dirty_for_io(page); +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) + spin_lock_irq(&page->mapping->tree_lock); +#else read_lock_irq(&page->mapping->tree_lock); +#endif if (!PageDirty(page)) { radix_tree_tag_clear(&page->mapping->page_tree, page_index(page), PAGECACHE_TAG_DIRTY); } +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) + spin_unlock_irq(&page->mapping->tree_lock); +#else read_unlock_irq(&page->mapping->tree_lock); +#endif unlock_page(page); } return 0; |