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Btrfs: fix btrfs_release_extent_buffer_page with the right usage of num_extent_pages 

num_extent_pages returns the number of pages in the specific range, not
the index of the last page in the eb range.

btrfs_release_extent_buffer_page is called with start_idx set 0 in current
codes, so it's not a problem yet. But the logic is indeed wrong.

Fix it here.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
This commit is contained in:
Wang Sheng-Hui 2012-04-06 14:35:31 +08:00 committed by Josef Bacik
parent 1b303fc054
commit 39bab87ba6
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/extent_io.c
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@ -3981,11 +3981,13 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb,
unsigned long start_idx)
{
unsigned long index;
unsigned long num_pages;
struct page *page;
BUG_ON(extent_buffer_under_io(eb));
index = num_extent_pages(eb->start, eb->len);
num_pages = num_extent_pages(eb->start, eb->len);
index = start_idx + num_pages;
if (start_idx >= index)
return;