Btrfs: change how we track dirty roots

I've been overloading root->dirty_list to keep track of dirty roots and which
roots need to have their commit roots switched at transaction commit time.  This
could cause us to lose an update to the root which could corrupt the file
system.  To fix this use a state bit to know if the root is dirty, and if it
isn't set we go ahead and move the root to the dirty list.  This way if we
re-dirty the root after adding it to the switch_commit list we make sure to
update it.  This also makes it so that the extent root is always the last root
on the dirty list to try and keep the amount of churn down at this point in the
commit.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
(cherry picked from commit e7070be198b34c26f39bd9010a29ce6462dc4f3e)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 20d1f2b0403d2e99c4f05577db4d63ac32370f4a..f64471e95e331514a906b4447ea5aa68fbbffc7f 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -213,11 +213,19 @@ static struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root)
  */
 static void add_root_to_dirty_list(struct btrfs_root *root)
 {
+       if (test_bit(BTRFS_ROOT_DIRTY, &root->state) ||
+           !test_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state))
+               return;
+
        spin_lock(&root->fs_info->trans_lock);
-       if (test_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state) &&
-           list_empty(&root->dirty_list)) {
-               list_add(&root->dirty_list,
-                        &root->fs_info->dirty_cowonly_roots);
+       if (!test_and_set_bit(BTRFS_ROOT_DIRTY, &root->state)) {
+               /* Want the extent tree to be the last on the list */
+               if (root->objectid == BTRFS_EXTENT_TREE_OBJECTID)
+                       list_move_tail(&root->dirty_list,
+                                      &root->fs_info->dirty_cowonly_roots);
+               else
+                       list_move(&root->dirty_list,
+                                 &root->fs_info->dirty_cowonly_roots);
        }
        spin_unlock(&root->fs_info->trans_lock);
 }

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 0b180708bf79d87a36c9dcc78bbd6d72772101df..782b322ee82fda38d4b27cd11dcc94b363d4aeab 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1776,6 +1776,7 @@ struct btrfs_subvolume_writers {
 #define BTRFS_ROOT_DEFRAG_RUNNING      6
 #define BTRFS_ROOT_FORCE_COW           7
 #define BTRFS_ROOT_MULTI_LOG_TASKS     8
+#define BTRFS_ROOT_DIRTY               9
 
 /*
  * in ram representation of the tree.  extent_root is used for all allocations

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index e88b59d13439690f15810359ee7be343ad86b7a9..ab02293ad1468c7bb373b243cfc19c39d57e9f2a 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1020,6 +1020,7 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
        u64 old_root_bytenr;
        u64 old_root_used;
        struct btrfs_root *tree_root = root->fs_info->tree_root;
+       bool extent_root = (root->objectid == BTRFS_EXTENT_TREE_OBJECTID);
 
        old_root_used = btrfs_root_used(&root->root_item);
        btrfs_write_dirty_block_groups(trans, root);
@@ -1038,7 +1039,12 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
                        return ret;
 
                old_root_used = btrfs_root_used(&root->root_item);
-               ret = btrfs_write_dirty_block_groups(trans, root);
+               if (extent_root) {
+                       ret = btrfs_write_dirty_block_groups(trans, root);
+                       if (ret)
+                               return ret;
+               }
+               ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
                if (ret)
                        return ret;
        }
@@ -1097,6 +1103,7 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
                next = fs_info->dirty_cowonly_roots.next;
                list_del_init(next);
                root = list_entry(next, struct btrfs_root, dirty_list);
+               clear_bit(BTRFS_ROOT_DIRTY, &root->state);
 
                if (root != fs_info->extent_root)
                        list_add_tail(&root->dirty_list,