Hello,
When i_size is multiples of PAGE_CACHE_SIZE, the last page's index
computed by the right-shift is larger than the correct value.
Regards
YZ
diff -r d0921c0349a9 extent_map.c
--- a/extent_map.c Fri Sep 14 10:23:29 2007 -0400
+++ b/extent_map.c Wed Sep 19 16:50:16 2007 +0800
@@ -1527,6 +1527,11 @@ int extent_write_full_page(struct extent
if (page->index == end_index) {
size_t offset = i_size & (PAGE_CACHE_SIZE - 1);
+ if (!offset) {
+ clear_extent_dirty(tree, start, page_end, GFP_NOFS);
+ unlock_page(page);
+ return 0;
+ }
zero_user_page(page, offset,
PAGE_CACHE_SIZE - offset, KM_USER0);
}
diff -r d0921c0349a9 inode.c
--- a/inode.c Fri Sep 14 10:23:29 2007 -0400
+++ b/inode.c Wed Sep 19 17:06:20 2007 +0800
@@ -1922,7 +1923,9 @@ int btrfs_defrag_file(struct file *file)
mutex_lock(&inode->i_mutex);
last_index = inode->i_size >> PAGE_CACHE_SHIFT;
- for (i = 0; i <= last_index; i++) {
+ if (inode->i_size & (PAGE_CACHE_SIZE - 1))
+ last_index++;
+ for (i = 0; i < last_index; i++) {
if (i == ra_index) {
ra_index = force_ra(inode->i_mapping, &file->f_ra,
file, ra_index, last_index);
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