fs/btrfs/tree-checker.c:1038:9: warning: missing braces around initializer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   358feceebbf68f33c44c6650d14455389e65282d
commit: 1465af12e254a68706e110846f59cf0f09683184 btrfs: tree-checker: fix false alert caused by legacy btrfs root item
date:   4 months ago
config: i386-randconfig-a014-20200624 (attached as .config)
compiler: gcc-4.9 (Ubuntu 4.9.3-13ubuntu2) 4.9.3
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1465af12e254a68706e110846f59cf0f09683184
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 1465af12e254a68706e110846f59cf0f09683184
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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/btrfs/tree-checker.c: In function 'check_root_item':
>> fs/btrfs/tree-checker.c:1038:9: warning: missing braces around initializer [-Wmissing-braces]
     struct btrfs_root_item ri = { 0 };
            ^
   fs/btrfs/tree-checker.c:1038:9: warning: (near initialization for 'ri.inode') [-Wmissing-braces]


vim +1038 fs/btrfs/tree-checker.c

  1033	
  1034	static int check_root_item(struct extent_buffer *leaf, struct btrfs_key *key,
  1035				   int slot)
  1036	{
  1037		struct btrfs_fs_info *fs_info = leaf->fs_info;
> 1038		struct btrfs_root_item ri = { 0 };
  1039		const u64 valid_root_flags = BTRFS_ROOT_SUBVOL_RDONLY |
  1040					     BTRFS_ROOT_SUBVOL_DEAD;
  1041		int ret;
  1042	
  1043		ret = check_root_key(leaf, key, slot);
  1044		if (ret < 0)
  1045			return ret;
  1046	
  1047		if (btrfs_item_size_nr(leaf, slot) != sizeof(ri) &&
  1048		    btrfs_item_size_nr(leaf, slot) != btrfs_legacy_root_item_size()) {
  1049			generic_err(leaf, slot,
  1050				    "invalid root item size, have %u expect %zu or %u",
  1051				    btrfs_item_size_nr(leaf, slot), sizeof(ri),
  1052				    btrfs_legacy_root_item_size());
  1053		}
  1054	
  1055		/*
  1056		 * For legacy root item, the members starting at generation_v2 will be
  1057		 * all filled with 0.
  1058		 * And since we allow geneartion_v2 as 0, it will still pass the check.
  1059		 */
  1060		read_extent_buffer(leaf, &ri, btrfs_item_ptr_offset(leaf, slot),
  1061				   btrfs_item_size_nr(leaf, slot));
  1062	
  1063		/* Generation related */
  1064		if (btrfs_root_generation(&ri) >
  1065		    btrfs_super_generation(fs_info->super_copy) + 1) {
  1066			generic_err(leaf, slot,
  1067				"invalid root generation, have %llu expect (0, %llu]",
  1068				    btrfs_root_generation(&ri),
  1069				    btrfs_super_generation(fs_info->super_copy) + 1);
  1070			return -EUCLEAN;
  1071		}
  1072		if (btrfs_root_generation_v2(&ri) >
  1073		    btrfs_super_generation(fs_info->super_copy) + 1) {
  1074			generic_err(leaf, slot,
  1075			"invalid root v2 generation, have %llu expect (0, %llu]",
  1076				    btrfs_root_generation_v2(&ri),
  1077				    btrfs_super_generation(fs_info->super_copy) + 1);
  1078			return -EUCLEAN;
  1079		}
  1080		if (btrfs_root_last_snapshot(&ri) >
  1081		    btrfs_super_generation(fs_info->super_copy) + 1) {
  1082			generic_err(leaf, slot,
  1083			"invalid root last_snapshot, have %llu expect (0, %llu]",
  1084				    btrfs_root_last_snapshot(&ri),
  1085				    btrfs_super_generation(fs_info->super_copy) + 1);
  1086			return -EUCLEAN;
  1087		}
  1088	
  1089		/* Alignment and level check */
  1090		if (!IS_ALIGNED(btrfs_root_bytenr(&ri), fs_info->sectorsize)) {
  1091			generic_err(leaf, slot,
  1092			"invalid root bytenr, have %llu expect to be aligned to %u",
  1093				    btrfs_root_bytenr(&ri), fs_info->sectorsize);
  1094			return -EUCLEAN;
  1095		}
  1096		if (btrfs_root_level(&ri) >= BTRFS_MAX_LEVEL) {
  1097			generic_err(leaf, slot,
  1098				    "invalid root level, have %u expect [0, %u]",
  1099				    btrfs_root_level(&ri), BTRFS_MAX_LEVEL - 1);
  1100			return -EUCLEAN;
  1101		}
  1102		if (ri.drop_level >= BTRFS_MAX_LEVEL) {
  1103			generic_err(leaf, slot,
  1104				    "invalid root level, have %u expect [0, %u]",
  1105				    ri.drop_level, BTRFS_MAX_LEVEL - 1);
  1106			return -EUCLEAN;
  1107		}
  1108	
  1109		/* Flags check */
  1110		if (btrfs_root_flags(&ri) & ~valid_root_flags) {
  1111			generic_err(leaf, slot,
  1112				    "invalid root flags, have 0x%llx expect mask 0x%llx",
  1113				    btrfs_root_flags(&ri), valid_root_flags);
  1114			return -EUCLEAN;
  1115		}
  1116		return 0;
  1117	}
  1118	

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Attachment: .config.gz
Description: application/gzip