X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Ffs%2Fbtrfs%2Finode.c;fp=kernel%2Ffs%2Fbtrfs%2Finode.c;h=3cff6523f27d57590a5ab4c29422614acb8e13aa;hb=52f993b8e89487ec9ee15a7fb4979e0f09a45b27;hp=4bc9dbf29a73fbde861d9a8cab06db3876c8bf20;hpb=c189ccac5702322ed843fe17057035b7222a59b6;p=kvmfornfv.git

diff --git a/kernel/fs/btrfs/inode.c b/kernel/fs/btrfs/inode.c
index 4bc9dbf29..3cff6523f 100644
--- a/kernel/fs/btrfs/inode.c
+++ b/kernel/fs/btrfs/inode.c
@@ -8691,9 +8691,14 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
 	 *    So even we call qgroup_free_data(), it won't decrease reserved
 	 *    space.
 	 * 2) Not written to disk
-	 *    This means the reserved space should be freed here.
+	 *    This means the reserved space should be freed here. However,
+	 *    if a truncate invalidates the page (by clearing PageDirty)
+	 *    and the page is accounted for while allocating extent
+	 *    in btrfs_check_data_free_space() we let delayed_ref to
+	 *    free the entire extent.
 	 */
-	btrfs_qgroup_free_data(inode, page_start, PAGE_CACHE_SIZE);
+	if (PageDirty(page))
+		btrfs_qgroup_free_data(inode, page_start, PAGE_SIZE);
 	if (!inode_evicting) {
 		clear_extent_bit(tree, page_start, page_end,
 				 EXTENT_LOCKED | EXTENT_DIRTY |