* [hare-scsi-devel:configfs-ns.v1 8/8] fs/configfs/mount.c:70:16: error: incomplete definition of type 'struct configfs_super_info'
@ 2026-05-11 13:06 kernel test robot
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From: kernel test robot @ 2026-05-11 13:06 UTC (permalink / raw)
To: Hannes Reinecke; +Cc: llvm, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git configfs-ns.v1
head: c924e1daab3eb4efc26275918155673d5e90c6ba
commit: c924e1daab3eb4efc26275918155673d5e90c6ba [8/8] configfs: configfs_create_root()
config: arm-randconfig-003-20260511 (https://download.01.org/0day-ci/archive/20260511/202605112124.QNu9jQRj-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260511/202605112124.QNu9jQRj-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605112124.QNu9jQRj-lkp@intel.com/
All errors (new ones prefixed by >>):
>> fs/configfs/mount.c:70:16: error: incomplete definition of type 'struct configfs_super_info'
70 | return sb_info->root == info->root && sb_info->ns == info->ns;
| ~~~~~~~^
fs/configfs/mount.c:66:9: note: forward declaration of 'struct configfs_super_info'
66 | struct configfs_super_info *sb_info =
| ^
fs/configfs/mount.c:70:30: error: incomplete definition of type 'struct configfs_super_info'
70 | return sb_info->root == info->root && sb_info->ns == info->ns;
| ~~~~^
fs/configfs/mount.c:66:9: note: forward declaration of 'struct configfs_super_info'
66 | struct configfs_super_info *sb_info =
| ^
fs/configfs/mount.c:70:47: error: incomplete definition of type 'struct configfs_super_info'
70 | return sb_info->root == info->root && sb_info->ns == info->ns;
| ~~~~~~~^
fs/configfs/mount.c:66:9: note: forward declaration of 'struct configfs_super_info'
66 | struct configfs_super_info *sb_info =
| ^
fs/configfs/mount.c:70:59: error: incomplete definition of type 'struct configfs_super_info'
70 | return sb_info->root == info->root && sb_info->ns == info->ns;
| ~~~~^
fs/configfs/mount.c:66:9: note: forward declaration of 'struct configfs_super_info'
66 | struct configfs_super_info *sb_info =
| ^
>> fs/configfs/mount.c:80:9: error: invalid application of 'sizeof' to an incomplete type 'typeof (*info)' (aka 'struct configfs_super_info')
80 | info = kzalloc_obj(*info);
| ^~~~~~~~~~~~~~~~~~
include/linux/slab.h:1040:2: note: expanded from macro 'kzalloc_obj'
1040 | __alloc_objs(kzalloc, default_gfp(__VA_ARGS__), typeof(P), 1)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/slab.h:973:37: note: expanded from macro '__alloc_objs'
973 | const size_t __obj_size = size_mul(sizeof(TYPE), COUNT); \
| ^ ~~~~~~
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:84:22: error: incomplete definition of type 'struct configfs_super_info'
84 | INIT_LIST_HEAD(&info->root.s_sibling);
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:85:22: error: incomplete definition of type 'struct configfs_super_info'
85 | INIT_LIST_HEAD(&info->root.s_children);
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:86:6: error: incomplete definition of type 'struct configfs_super_info'
86 | info->root.s_type = CONFIGFS_ROOT;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:87:6: error: incomplete definition of type 'struct configfs_super_info'
87 | info->root.s_element = &info->group.cg_item;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:87:30: error: incomplete definition of type 'struct configfs_super_info'
87 | info->root.s_element = &info->group.cg_item;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:88:6: error: incomplete definition of type 'struct configfs_super_info'
88 | info->ns = fsi->ns;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:90:6: error: incomplete definition of type 'struct configfs_super_info'
90 | info->group.cg_item.ci_name = (char *)root_name;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:98:13: error: incomplete definition of type 'struct configfs_super_info'
98 | &info->root, sb);
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:114:25: error: incomplete definition of type 'struct configfs_super_info'
114 | config_group_init(&info->group);
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:115:6: error: incomplete definition of type 'struct configfs_super_info'
115 | info->group.cg_item.ci_dentry = root;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
fs/configfs/mount.c:116:24: error: incomplete definition of type 'struct configfs_super_info'
116 | root->d_fsdata = &info->root;
| ~~~~^
fs/configfs/mount.c:76:9: note: forward declaration of 'struct configfs_super_info'
76 | struct configfs_super_info *info;
| ^
>> fs/configfs/mount.c:126:9: error: call to undeclared function 'vfs_get_super'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
126 | return vfs_get_super(fc, configfs_test_super, configfs_fill_super);
| ^
fs/configfs/mount.c:126:9: note: did you mean 'vfs_get_tree'?
include/linux/fs_context.h:147:12: note: 'vfs_get_tree' declared here
147 | extern int vfs_get_tree(struct fs_context *fc);
| ^
>> fs/configfs/mount.c:188:2: error: use of undeclared identifier 'err'
188 | err = idr_alloc(&configfs_mount, root, ns->ns_id,
| ^~~
fs/configfs/mount.c:190:6: error: use of undeclared identifier 'err'
190 | if (err < 0) {
| ^~~
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
vim +70 fs/configfs/mount.c
63
64 static int configfs_test_super(struct super_block *sb, struct fs_context *fc)
65 {
> 66 struct configfs_super_info *sb_info =
67 (struct configfs_super_info *)sb->s_fs_info;
68 struct configfs_super_info *info = fc->s_fs_info;
69
> 70 return sb_info->root == info->root && sb_info->ns == info->ns;
71 }
72
73 static int configfs_fill_super(struct super_block *sb, struct fs_context *fc)
74 {
75 struct configfs_fs_info *fsi = fc->fs_private;
> 76 struct configfs_super_info *info;
77 struct inode *inode;
78 struct dentry *root;
79
> 80 info = kzalloc_obj(*info);
81 if (!info)
82 return -ENOMEM;
83
84 INIT_LIST_HEAD(&info->root.s_sibling);
85 INIT_LIST_HEAD(&info->root.s_children);
86 info->root.s_type = CONFIGFS_ROOT;
87 info->root.s_element = &info->group.cg_item;
88 info->ns = fsi->ns;
89
90 info->group.cg_item.ci_name = (char *)root_name;
91 sb->s_blocksize = PAGE_SIZE;
92 sb->s_blocksize_bits = PAGE_SHIFT;
93 sb->s_magic = CONFIGFS_MAGIC;
94 sb->s_op = &configfs_ops;
95 sb->s_time_gran = 1;
96
97 inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
98 &info->root, sb);
99 if (inode) {
100 inode->i_op = &configfs_root_inode_operations;
101 inode->i_fop = &configfs_dir_operations;
102 /* directory inodes start off with i_nlink == 2 (for "." entry) */
103 inc_nlink(inode);
104 } else {
105 pr_debug("could not get root inode\n");
106 return -ENOMEM;
107 }
108
109 root = d_make_root(inode);
110 if (!root) {
111 pr_debug("%s: could not get root dentry!\n",__func__);
112 return -ENOMEM;
113 }
114 config_group_init(&info->group);
115 info->group.cg_item.ci_dentry = root;
116 root->d_fsdata = &info->root;
117 sb->s_root = root;
118 set_default_d_op(sb, &configfs_dentry_ops); /* the rest get that */
119 sb->s_d_flags |= DCACHE_DONTCACHE;
120 sb->s_fs_info = info;
121 return 0;
122 }
123
124 static int configfs_get_tree(struct fs_context *fc)
125 {
> 126 return vfs_get_super(fc, configfs_test_super, configfs_fill_super);
127 }
128
129 static void configfs_fs_context_free(struct fs_context *fc)
130 {
131 struct configfs_fs_info *fsi = fc->fs_private;
132
133 if (fsi->ns)
134 kobj_ns_drop(KOBJ_NS_TYPE_NET, fsi->ns);
135
136 kfree(fsi);
137 }
138
139 static const struct fs_context_operations configfs_context_ops = {
140 .get_tree = configfs_get_tree,
141 .free = configfs_fs_context_free,
142 };
143
144 static int configfs_init_fs_context(struct fs_context *fc)
145 {
146 struct configfs_fs_info *fsi;
147
148 fsi = kzalloc_obj(*fsi);
149 if (!fsi)
150 return -ENOMEM;
151 fsi->ns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);
152 if (fsi->ns) {
153 struct net *netns = to_net_ns(fsi->ns);
154
155 put_user_ns(fc->user_ns);
156 fc->user_ns = get_user_ns(netns->user_ns);
157 }
158 fc->fs_private = fsi;
159 fc->ops = &configfs_context_ops;
160 fc->global = true;
161 return 0;
162 }
163
164 static void configfs_kill_sb(struct super_block *sb)
165 {
166 struct configfs_sb_info *info =
167 (struct configfs_sb_info *)(sb->s_fs_info);
168
169 kill_anon_super(sb);
170 kfree(info);
171 }
172
173 static struct file_system_type configfs_fs_type = {
174 .owner = THIS_MODULE,
175 .name = "configfs",
176 .init_fs_context = configfs_init_fs_context,
177 .kill_sb = configfs_kill_sb,
178 };
179 MODULE_ALIAS_FS("configfs");
180
181 struct configfs_root_info *configfs_get_root(struct ns_common *ns)
182 {
183 struct configfs_root_info *root =
184 kzalloc_obj(*root);
185
186 if (!root)
187 return ERR_PTR(-ENOMEM);
> 188 err = idr_alloc(&configfs_mount, root, ns->ns_id,
189 ns->ns_id + 1, GFP_KERNEL);
190 if (err < 0) {
191 kfree(root);
192 return ERR_PTR(err);
193 }
194 WARN_ON(err != ns->ns_id);
195 return root;
196 }
197
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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