disk space caching generation missmatch

Commit Message

Josef Bacik Dec. 1, 2010, 8:03 p.m. UTC

None

Patch

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 87aae66..4fd5659 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2794,13 +2794,17 @@  again:
 	if (i_size_read(inode) > 0) {
 		ret = btrfs_truncate_free_space_cache(root, trans, path,
 						      inode);
-		if (ret)
+		if (ret) {
+			printk(KERN_ERR "truncate free space cache failed for %llu, %d\n",
+			       block_group->key.objectid, ret);
 			goto out_put;
+		}
 	}
 
 	spin_lock(&block_group->lock);
 	if (block_group->cached != BTRFS_CACHE_FINISHED) {
 		spin_unlock(&block_group->lock);
+		printk(KERN_ERR "block group %llu not cached\n", block_group->key.objectid);
 		goto out_put;
 	}
 	spin_unlock(&block_group->lock);
@@ -2820,8 +2824,10 @@  again:
 	num_pages *= PAGE_CACHE_SIZE;
 
 	ret = btrfs_check_data_free_space(inode, num_pages);
-	if (ret)
+	if (ret) {
+		printk(KERN_ERR "not enough free space for cache %llu\n", block_group->key.objectid);
 		goto out_put;
+	}
 
 	ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages,
 					      num_pages, num_pages,
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 22ee0dc..0078172 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -511,6 +511,8 @@  int btrfs_write_out_cache(struct btrfs_root *root,
 	spin_lock(&block_group->lock);
 	if (block_group->disk_cache_state < BTRFS_DC_SETUP) {
 		spin_unlock(&block_group->lock);
+		printk(KERN_ERR "block group %llu, wrong dcs %d\n", block_group->key.objectid,
+		       block_group->disk_cache_state);
 		return 0;
 	}
 	spin_unlock(&block_group->lock);
@@ -520,6 +522,7 @@  int btrfs_write_out_cache(struct btrfs_root *root,
 		return 0;
 
 	if (!i_size_read(inode)) {
+		printk(KERN_ERR "no allocated space for block group %llu\n", block_group->key.objectid);
 		iput(inode);
 		return 0;
 	}
@@ -771,6 +774,7 @@  out_free:
 		block_group->disk_cache_state = BTRFS_DC_ERROR;
 		spin_unlock(&block_group->lock);
 		BTRFS_I(inode)->generation = 0;
+		printk(KERN_ERR "problem writing out block group cache for %llu\n", block_group->key.objectid);
 	}
 	kfree(checksums);
 	btrfs_update_inode(trans, root, inode);