Re: [PATCH 3/4] configfs: implement committable items

[kernel test robot]

Hi Bartosz,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hch-configfs/for-next]
[also build test WARNING on linux/master linus/master v5.10-rc5 next-20201125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Bartosz-Golaszewski/configfs-implement-committable-items-and-add-sample-code/20201125-232501
base:   git://git.infradead.org/users/hch/configfs.git for-next
config: arm-randconfig-r031-20201125 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/9ddc94acfed5f87493359f719d6eb5c259b6bd6d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Bartosz-Golaszewski/configfs-implement-committable-items-and-add-sample-code/20201125-232501
        git checkout 9ddc94acfed5f87493359f719d6eb5c259b6bd6d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   fs/configfs/dir.c: In function 'configfs_rename':
>> fs/configfs/dir.c:1714:26: warning: variable 'committable_group_sd' set but not used [-Wunused-but-set-variable]
    1714 |  struct configfs_dirent *committable_group_sd;
         |                          ^~~~~~~~~~~~~~~~~~~~

vim +/committable_group_sd +1714 fs/configfs/dir.c

  1707	
  1708	static int configfs_rename(struct inode *old_dir, struct dentry *old_dentry,
  1709				   struct inode *new_dir, struct dentry *new_dentry,
  1710				   unsigned int flags)
  1711	{
  1712		struct configfs_dirent *sd, *old_parent_sd, *new_parent_sd;
  1713		struct dentry *old_parent_dentry, *new_parent_dentry;
> 1714		struct configfs_dirent *committable_group_sd;
  1715		struct dentry *committable_group_dentry;
  1716		struct config_item *committable_group_item, *item, *new_parent_item;
  1717		struct configfs_subsystem *committable_group_subsys;
  1718		struct configfs_group_operations *committable_group_ops;
  1719		int ret = 0;
  1720	
  1721		if (flags)
  1722			return -EINVAL;
  1723	
  1724		old_parent_dentry = old_dentry->d_parent;
  1725		new_parent_dentry = new_dentry->d_parent;
  1726	
  1727		sd = old_dentry->d_fsdata;
  1728		old_parent_sd = old_dentry->d_parent->d_fsdata;
  1729		new_parent_sd = new_dentry->d_parent->d_fsdata;
  1730	
  1731		if (!old_parent_sd || !new_parent_sd)
  1732			return -EPERM;
  1733	
  1734		/*
  1735		 * Renaming must always be between a 'pending' and a 'live' group and
  1736		 * both need to have the same parent.
  1737		 */
  1738		if (!((old_parent_sd->s_type & CONFIGFS_GROUP_PENDING) &&
  1739		      (new_parent_sd->s_type & CONFIGFS_GROUP_LIVE)) &&
  1740		    !((old_parent_sd->s_type & CONFIGFS_GROUP_LIVE) &&
  1741		      (new_parent_sd->s_type & CONFIGFS_GROUP_PENDING)))
  1742			return -EPERM;
  1743	
  1744		if (old_parent_dentry->d_parent != new_parent_dentry->d_parent)
  1745			return -EPERM;
  1746	
  1747		committable_group_dentry = old_parent_dentry->d_parent;
  1748		committable_group_sd = committable_group_dentry->d_fsdata;
  1749		/*
  1750		 * Grab a reference to the committable group for the duration of
  1751		 * this function.
  1752		 */
  1753		committable_group_item =
  1754			configfs_get_config_item(committable_group_dentry);
  1755		committable_group_subsys =
  1756			to_config_group(committable_group_item)->cg_subsys;
  1757		committable_group_ops = committable_group_item->ci_type->ct_group_ops;
  1758	
  1759		item = sd->s_element;
  1760		new_parent_item = new_parent_sd->s_element;
  1761	
  1762		if (WARN_ON(!is_committable_group(committable_group_item))) {
  1763			/* This would be a result of a programming error in configfs. */
  1764			config_item_put(committable_group_item);
  1765			return -EPERM;
  1766		}
  1767	
  1768		mutex_lock(&committable_group_subsys->su_mutex);
  1769		spin_lock(&configfs_dirent_lock);
  1770	
  1771		if ((old_parent_sd->s_type & CONFIGFS_GROUP_PENDING) &&
  1772		    (new_parent_sd->s_type & CONFIGFS_GROUP_LIVE))
  1773			ret = committable_group_ops->commit_item(item);
  1774		else
  1775			ret = committable_group_ops->uncommit_item(item);
  1776		if (ret)
  1777			goto out;
  1778	
  1779		new_dentry->d_fsdata = sd;
  1780		list_move(&sd->s_sibling, &new_parent_sd->s_children);
  1781		item->ci_parent = new_parent_item;
  1782		d_move(old_dentry, new_dentry);
  1783	
  1784	out:
  1785		spin_unlock(&configfs_dirent_lock);
  1786		mutex_unlock(&committable_group_subsys->su_mutex);
  1787		config_item_put(committable_group_item);
  1788	
  1789		return ret;
  1790	}
  1791	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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