From 5d2361db48899789fb466ff62db5d5fc7b070e86 Mon Sep 17 00:00:00 2001 From: Forrest Liu Date: Mon, 9 Feb 2015 17:31:45 +0800 Subject: [PATCH] Btrfs: btrfs_release_extent_buffer_page didn't free pages of dummy extent btrfs_release_extent_buffer_page() can't handle dummy extent that allocated by btrfs_clone_extent_buffer() properly. That is because reference count of pages that allocated by btrfs_clone_extent_buffer() was 2, 1 by alloc_page(), and another by attach_extent_buffer_page(). Running following command repeatly can check this memory leak problem btrfs inspect-internal inode-resolve 256 /mnt/btrfs Signed-off-by: Chien-Kuan Yeh Signed-off-by: Forrest Liu Reviewed-by: Filipe Manana Tested-by: Filipe Manana Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 51 ++++++++++++++++++++++---------------------- 1 file changed, 26 insertions(+), 25 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index ea100eb188de..43af5a61ad25 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4560,36 +4560,37 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb) do { index--; page = eb->pages[index]; - if (page && mapped) { + if (!page) + continue; + if (mapped) spin_lock(&page->mapping->private_lock); + /* + * We do this since we'll remove the pages after we've + * removed the eb from the radix tree, so we could race + * and have this page now attached to the new eb. So + * only clear page_private if it's still connected to + * this eb. + */ + if (PagePrivate(page) && + page->private == (unsigned long)eb) { + BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); + BUG_ON(PageDirty(page)); + BUG_ON(PageWriteback(page)); /* - * We do this since we'll remove the pages after we've - * removed the eb from the radix tree, so we could race - * and have this page now attached to the new eb. So - * only clear page_private if it's still connected to - * this eb. + * We need to make sure we haven't be attached + * to a new eb. */ - if (PagePrivate(page) && - page->private == (unsigned long)eb) { - BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); - BUG_ON(PageDirty(page)); - BUG_ON(PageWriteback(page)); - /* - * We need to make sure we haven't be attached - * to a new eb. - */ - ClearPagePrivate(page); - set_page_private(page, 0); - /* One for the page private */ - page_cache_release(page); - } - spin_unlock(&page->mapping->private_lock); - - } - if (page) { - /* One for when we alloced the page */ + ClearPagePrivate(page); + set_page_private(page, 0); + /* One for the page private */ page_cache_release(page); } + + if (mapped) + spin_unlock(&page->mapping->private_lock); + + /* One for when we alloced the page */ + page_cache_release(page); } while (index != 0); }