Btrfs: do not allow logged extents to be merged or removed

We drop the extent map tree lock while we're logging extents, so somebody
could come in and merge another extent into this one and screw up our
logging, or they could even remove us from the list which would keep us from
logging the extent or freeing our ref on it, so we need to make sure to not
clear LOGGING until after the extent is logged, and then we can merge it to
adjacent extents.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

3 files changed, 16 insertions, 3 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index fff2c28497b6..ed88f5ee4bea 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -171,6 +171,10 @@ static int mergable_maps(struct extent_map *prev, struct extent_map *next)
         if (test_bit(EXTENT_FLAG_COMPRESSED, &prev->flags))
                 return 0;
 
+        if (test_bit(EXTENT_FLAG_LOGGING, &prev->flags) ||
+            test_bit(EXTENT_FLAG_LOGGING, &next->flags))
+                return 0;
+
         if (extent_map_end(prev) == next->start &&
             prev->flags == next->flags &&
             prev->bdev == next->bdev &&
@@ -256,7 +260,8 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
         if (!em)
                 goto out;
 
-        list_move(&em->list, &tree->modified_extents);
+        if (!test_bit(EXTENT_FLAG_LOGGING, &em->flags))
+                list_move(&em->list, &tree->modified_extents);
         em->generation = gen;
         clear_bit(EXTENT_FLAG_PINNED, &em->flags);
         em->mod_start = em->start;
@@ -281,6 +286,12 @@ out:
 
 }
 
+void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em)
+{
+        clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
+        try_merge_map(tree, em);
+}
+
 /**
  * add_extent_mapping - add new extent map to the extent tree
  * @tree:       tree to insert new map in
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 922943ce29e8..c6598c89cff8 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -69,6 +69,7 @@ void free_extent_map(struct extent_map *em);
 int __init extent_map_init(void);
 void extent_map_exit(void);
 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
+void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
                                          u64 start, u64 len);
 #endif
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 83186c7e45d4..de8899b04d69 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3410,13 +3410,13 @@ static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans,
                 em = list_entry(extents.next, struct extent_map, list);
 
                 list_del_init(&em->list);
-                clear_bit(EXTENT_FLAG_LOGGING, &em->flags);
 
                 /*
                  * If we had an error we just need to delete everybody from our
                  * private list.
                  */
                 if (ret) {
+                        clear_em_logging(tree, em);
                         free_extent_map(em);
                         continue;
                 }
@@ -3424,8 +3424,9 @@ static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans,
                 write_unlock(&tree->lock);
 
                 ret = log_one_extent(trans, inode, root, em, path);
-                free_extent_map(em);
                 write_lock(&tree->lock);
+                clear_em_logging(tree, em);
+                free_extent_map(em);
         }
         WARN_ON(!list_empty(&extents));
         write_unlock(&tree->lock);