Btrfs: fixup dirty_inode related deadlocks

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index c076474..5bbccbc 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -120,6 +120,58 @@ make_bad:
        make_bad_inode(inode);
 }
 
+static void fill_inode_item(struct btrfs_inode_item *item,
+                           struct inode *inode)
+{
+       btrfs_set_inode_uid(item, inode->i_uid);
+       btrfs_set_inode_gid(item, inode->i_gid);
+       btrfs_set_inode_size(item, inode->i_size);
+       btrfs_set_inode_mode(item, inode->i_mode);
+       btrfs_set_inode_nlink(item, inode->i_nlink);
+       btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
+       btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
+       btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
+       btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
+       btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
+       btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
+       btrfs_set_inode_nblocks(item, inode->i_blocks);
+       btrfs_set_inode_generation(item, inode->i_generation);
+}
+
+
+static int btrfs_update_inode(struct btrfs_trans_handle *trans,
+                             struct btrfs_root *root,
+                             struct inode *inode)
+{
+       struct btrfs_inode_item *inode_item;
+       struct btrfs_path *path;
+       int ret;
+
+       path = btrfs_alloc_path();
+       BUG_ON(!path);
+       btrfs_init_path(path);
+       ret = btrfs_lookup_inode(trans, root, path,
+                                &BTRFS_I(inode)->location, 1);
+       if (ret) {
+               if (ret > 0)
+                       ret = -ENOENT;
+               goto failed;
+       }
+
+       inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
+                                 path->slots[0],
+                                 struct btrfs_inode_item);
+
+       fill_inode_item(inode_item, inode);
+       btrfs_mark_buffer_dirty(path->nodes[0]);
+       ret = 0;
+failed:
+       btrfs_release_path(root, path);
+       btrfs_free_path(path);
+       return ret;
+}
+
+
 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
                              struct btrfs_root *root,
                              struct inode *dir,
@@ -166,10 +218,11 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
        dentry->d_inode->i_ctime = dir->i_ctime;
 err:
        btrfs_free_path(path);
-       if (ret == 0) {
-               inode_dec_link_count(dentry->d_inode);
+       if (!ret) {
                dir->i_size -= name_len * 2;
-               mark_inode_dirty(dir);
+               btrfs_update_inode(trans, root, dir);
+               drop_nlink(dentry->d_inode);
+               btrfs_update_inode(trans, root, dentry->d_inode);
        }
        return ret;
 }
@@ -668,56 +721,6 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
        return 0;
 }
 
-static void fill_inode_item(struct btrfs_inode_item *item,
-                           struct inode *inode)
-{
-       btrfs_set_inode_uid(item, inode->i_uid);
-       btrfs_set_inode_gid(item, inode->i_gid);
-       btrfs_set_inode_size(item, inode->i_size);
-       btrfs_set_inode_mode(item, inode->i_mode);
-       btrfs_set_inode_nlink(item, inode->i_nlink);
-       btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
-       btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
-       btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
-       btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
-       btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
-       btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
-       btrfs_set_inode_nblocks(item, inode->i_blocks);
-       btrfs_set_inode_generation(item, inode->i_generation);
-}
-
-static int btrfs_update_inode(struct btrfs_trans_handle *trans,
-                             struct btrfs_root *root,
-                             struct inode *inode)
-{
-       struct btrfs_inode_item *inode_item;
-       struct btrfs_path *path;
-       int ret;
-
-       path = btrfs_alloc_path();
-       BUG_ON(!path);
-       btrfs_init_path(path);
-       ret = btrfs_lookup_inode(trans, root, path,
-                                &BTRFS_I(inode)->location, 1);
-       if (ret) {
-               if (ret > 0)
-                       ret = -ENOENT;
-               goto failed;
-       }
-
-       inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
-                                 path->slots[0],
-                                 struct btrfs_inode_item);
-
-       fill_inode_item(inode_item, inode);
-       btrfs_mark_buffer_dirty(path->nodes[0]);
-       ret = 0;
-failed:
-       btrfs_release_path(root, path);
-       btrfs_free_path(path);
-       return ret;
-}
-
 static int btrfs_write_inode(struct inode *inode, int wait)
 {
        struct btrfs_root *root = BTRFS_I(inode)->root;