Re: [PATCH 5/5] btrfs: Switch seed device to list api

[kernel test robot <lkp@intel.com>]

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Hi Nikolay,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kdave/for-next]
[also build test ERROR on next-20200715]
[cannot apply to v5.8-rc5]
[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/Nikolay-Borisov/Convert-seed-devices-to-proper-list-API/20200715-185102
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
config: x86_64-rhel-7.6-kselftests (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All error/warnings (new ones prefixed by >>):

   In file included from fs/btrfs/volumes.c:17:
   fs/btrfs/ctree.h:2271:8: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
    2271 | size_t __const btrfs_get_num_csums(void);
         |        ^~~~~~~
   In file included from fs/btrfs/volumes.c:28:
   fs/btrfs/sysfs.h:16:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
      16 | const char * const btrfs_feature_set_name(enum btrfs_feature_set set);
         | ^~~~~
   fs/btrfs/volumes.c:1030:6: warning: no previous prototype for '__btrfs_free_extra_devids' [-Wmissing-prototypes]
    1030 | void __btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step,
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   fs/btrfs/volumes.c: In function 'btrfs_rm_dev_replace_free_srcdev':
>> fs/btrfs/volumes.c:2219:28: warning: variable 'tmp_fs_devices' set but not used [-Wunused-but-set-variable]
    2219 |   struct btrfs_fs_devices *tmp_fs_devices;
         |                            ^~~~~~~~~~~~~~
--
   In file included from fs/btrfs/delayed-inode.h:17,
                    from fs/btrfs/super.c:30:
   fs/btrfs/ctree.h:2271:8: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
    2271 | size_t __const btrfs_get_num_csums(void);
         |        ^~~~~~~
   In file included from fs/btrfs/super.c:46:
   fs/btrfs/sysfs.h:16:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
      16 | const char * const btrfs_feature_set_name(enum btrfs_feature_set set);
         | ^~~~~
   fs/btrfs/super.c: In function 'btrfs_show_devname':
>> fs/btrfs/super.c:2404:28: error: 'struct btrfs_fs_devices' has no member named 'seed'
    2404 |   cur_devices = cur_devices->seed;
         |                            ^~

vim +2404 fs/btrfs/super.c

9e7cc91a6d18a4 Wang Xiaoguang  2016-08-01  2377  
9c5085c147989d Josef Bacik     2012-06-05  2378  static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
9c5085c147989d Josef Bacik     2012-06-05  2379  {
9c5085c147989d Josef Bacik     2012-06-05  2380  	struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
9c5085c147989d Josef Bacik     2012-06-05  2381  	struct btrfs_fs_devices *cur_devices;
9c5085c147989d Josef Bacik     2012-06-05  2382  	struct btrfs_device *dev, *first_dev = NULL;
9c5085c147989d Josef Bacik     2012-06-05  2383  	struct list_head *head;
9c5085c147989d Josef Bacik     2012-06-05  2384  
88c14590cdd6f3 David Sterba    2018-03-16  2385  	/*
88c14590cdd6f3 David Sterba    2018-03-16  2386  	 * Lightweight locking of the devices. We should not need
88c14590cdd6f3 David Sterba    2018-03-16  2387  	 * device_list_mutex here as we only read the device data and the list
88c14590cdd6f3 David Sterba    2018-03-16  2388  	 * is protected by RCU.  Even if a device is deleted during the list
88c14590cdd6f3 David Sterba    2018-03-16  2389  	 * traversals, we'll get valid data, the freeing callback will wait at
52042d8e82ff50 Andrea Gelmini  2018-11-28  2390  	 * least until the rcu_read_unlock.
88c14590cdd6f3 David Sterba    2018-03-16  2391  	 */
88c14590cdd6f3 David Sterba    2018-03-16  2392  	rcu_read_lock();
9c5085c147989d Josef Bacik     2012-06-05  2393  	cur_devices = fs_info->fs_devices;
9c5085c147989d Josef Bacik     2012-06-05  2394  	while (cur_devices) {
9c5085c147989d Josef Bacik     2012-06-05  2395  		head = &cur_devices->devices;
88c14590cdd6f3 David Sterba    2018-03-16  2396  		list_for_each_entry_rcu(dev, head, dev_list) {
e6e674bd4d54fe Anand Jain      2017-12-04  2397  			if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
aa9ddcd4b55571 Josef Bacik     2012-08-02  2398  				continue;
0aeb8a6e67cdde Anand Jain      2014-06-30  2399  			if (!dev->name)
0aeb8a6e67cdde Anand Jain      2014-06-30  2400  				continue;
9c5085c147989d Josef Bacik     2012-06-05  2401  			if (!first_dev || dev->devid < first_dev->devid)
9c5085c147989d Josef Bacik     2012-06-05  2402  				first_dev = dev;
9c5085c147989d Josef Bacik     2012-06-05  2403  		}
9c5085c147989d Josef Bacik     2012-06-05 @2404  		cur_devices = cur_devices->seed;
9c5085c147989d Josef Bacik     2012-06-05  2405  	}
9c5085c147989d Josef Bacik     2012-06-05  2406  
672d599041c862 Misono Tomohiro 2018-08-02  2407  	if (first_dev)
672d599041c862 Misono Tomohiro 2018-08-02  2408  		seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\");
672d599041c862 Misono Tomohiro 2018-08-02  2409  	else
9c5085c147989d Josef Bacik     2012-06-05  2410  		WARN_ON(1);
88c14590cdd6f3 David Sterba    2018-03-16  2411  	rcu_read_unlock();
9c5085c147989d Josef Bacik     2012-06-05  2412  	return 0;
9c5085c147989d Josef Bacik     2012-06-05  2413  }
9c5085c147989d Josef Bacik     2012-06-05  2414  

---
0-DAY CI Kernel Test Service, Intel Corporation
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