Re: [PATCH V2] ovl: fix mount fail because the upper doesn't have space
From: kernel test robot
Date: Wed Jul 19 2023 - 07:26:55 EST
Hi Yunlong,
kernel test robot noticed the following build warnings:
[auto build test WARNING on mszeredi-vfs/overlayfs-next]
[also build test WARNING on linus/master v6.5-rc2 next-20230719]
[cannot apply to mszeredi-vfs/next]
[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#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Yunlong-Xing/ovl-fix-mount-fail-because-the-upper-doesn-t-have-space/20230719-165654
base: https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-next
patch link: https://lore.kernel.org/r/20230719085434.154834-1-yunlong.xing%40unisoc.com
patch subject: [PATCH V2] ovl: fix mount fail because the upper doesn't have space
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20230719/202307191949.czbm8CT2-lkp@xxxxxxxxx/config)
compiler: alpha-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230719/202307191949.czbm8CT2-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307191949.czbm8CT2-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
fs/overlayfs/super.c: In function 'ovl_make_workdir':
>> fs/overlayfs/super.c:1192:25: warning: missing terminating " character
1192 | pr_warn("upper fs does not support RENAME_WHITEOUT (%i).\n,
| ^
fs/overlayfs/super.c:1193:28: warning: missing terminating " character
1193 | err");
| ^
fs/overlayfs/super.c:2065:23: error: unterminated argument list invoking macro "pr_warn"
2065 | module_exit(ovl_exit);
| ^
fs/overlayfs/super.c:1192:17: error: 'pr_warn' undeclared (first use in this function)
1192 | pr_warn("upper fs does not support RENAME_WHITEOUT (%i).\n,
| ^~~~~~~
fs/overlayfs/super.c:1192:17: note: each undeclared identifier is reported only once for each function it appears in
fs/overlayfs/super.c:1192:24: error: expected ';' at end of input
1192 | pr_warn("upper fs does not support RENAME_WHITEOUT (%i).\n,
| ^
| ;
......
fs/overlayfs/super.c:1191:9: note: '-Wmisleading-indentation' is disabled from this point onwards, since column-tracking was disabled due to the size of the code/headers
1191 | if (!rename_whiteout)
| ^~
fs/overlayfs/super.c:1191:9: note: adding '-flarge-source-files' will allow for more column-tracking support, at the expense of compilation time and memory
fs/overlayfs/super.c:1192:17: error: expected declaration or statement at end of input
1192 | pr_warn("upper fs does not support RENAME_WHITEOUT (%i).\n,
| ^~~~~~~
fs/overlayfs/super.c:1188:17: error: label 'out' used but not defined
1188 | goto out;
| ^~~~
fs/overlayfs/super.c:1144:13: warning: unused variable 'fh_type' [-Wunused-variable]
1144 | int fh_type;
| ^~~~~~~
fs/overlayfs/super.c: At top level:
fs/overlayfs/super.c:1136:12: warning: 'ovl_make_workdir' defined but not used [-Wunused-function]
1136 | static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs,
| ^~~~~~~~~~~~~~~~
fs/overlayfs/super.c:1118:12: warning: 'ovl_create_volatile_dirty' defined but not used [-Wunused-function]
1118 | static int ovl_create_volatile_dirty(struct ovl_fs *ofs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
fs/overlayfs/super.c:969:12: warning: 'ovl_get_upper' defined but not used [-Wunused-function]
969 | static int ovl_get_upper(struct super_block *sb, struct ovl_fs *ofs,
| ^~~~~~~~~~~~~
fs/overlayfs/super.c:926:36: warning: 'ovl_user_xattr_handlers' defined but not used [-Wunused-variable]
926 | static const struct xattr_handler *ovl_user_xattr_handlers[] = {
| ^~~~~~~~~~~~~~~~~~~~~~~
fs/overlayfs/super.c:920:36: warning: 'ovl_trusted_xattr_handlers' defined but not used [-Wunused-variable]
920 | static const struct xattr_handler *ovl_trusted_xattr_handlers[] = {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
fs/overlayfs/super.c:859:13: warning: 'ovl_workdir_ok' defined but not used [-Wunused-function]
859 | static bool ovl_workdir_ok(struct dentry *workdir, struct dentry *upperdir)
| ^~~~~~~~~~~~~~
fs/overlayfs/super.c:816:12: warning: 'ovl_lower_dir' defined but not used [-Wunused-function]
816 | static int ovl_lower_dir(const char *name, struct path *path,
| ^~~~~~~~~~~~~
fs/overlayfs/super.c:580:12: warning: 'ovl_fs_params_verify' defined but not used [-Wunused-function]
580 | static int ovl_fs_params_verify(const struct ovl_fs_context *ctx,
| ^~~~~~~~~~~~~~~~~~~~
fs/overlayfs/super.c:493:12: warning: 'ovl_parse_param' defined but not used [-Wunused-function]
493 | static int ovl_parse_param(struct fs_context *fc, struct fs_parameter *param)
| ^~~~~~~~~~~~~~~
fs/overlayfs/super.c:442:38: warning: 'ovl_super_operations' defined but not used [-Wunused-const-variable=]
442 | static const struct super_operations ovl_super_operations = {
| ^~~~~~~~~~~~~~~~~~~~
fs/overlayfs/super.c:420:12: warning: 'ovl_reconfigure' defined but not used [-Wunused-function]
420 | static int ovl_reconfigure(struct fs_context *fc)
| ^~~~~~~~~~~~~~~
fs/overlayfs/super.c:166:39: warning: 'ovl_dentry_operations' defined but not used [-Wunused-const-variable=]
166 | static const struct dentry_operations ovl_dentry_operations = {
| ^~~~~~~~~~~~~~~~~~~~~
vim +1192 fs/overlayfs/super.c
1135
1136 static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs,
1137 const struct path *workpath)
1138 {
1139 struct vfsmount *mnt = ovl_upper_mnt(ofs);
1140 struct dentry *workdir;
1141 struct file *tmpfile;
1142 bool rename_whiteout;
1143 bool d_type;
1144 int fh_type;
1145 int err;
1146
1147 err = mnt_want_write(mnt);
1148 if (err)
1149 return err;
1150
1151 workdir = ovl_workdir_create(ofs, OVL_WORKDIR_NAME, false);
1152 err = PTR_ERR(workdir);
1153 if (IS_ERR_OR_NULL(workdir))
1154 goto out;
1155
1156 ofs->workdir = workdir;
1157
1158 err = ovl_setup_trap(sb, ofs->workdir, &ofs->workdir_trap, "workdir");
1159 if (err)
1160 goto out;
1161
1162 /*
1163 * Upper should support d_type, else whiteouts are visible. Given
1164 * workdir and upper are on same fs, we can do iterate_dir() on
1165 * workdir. This check requires successful creation of workdir in
1166 * previous step.
1167 */
1168 err = ovl_check_d_type_supported(workpath);
1169 if (err < 0)
1170 goto out;
1171
1172 d_type = err;
1173 if (!d_type)
1174 pr_warn("upper fs needs to support d_type.\n");
1175
1176 /* Check if upper/work fs supports O_TMPFILE */
1177 tmpfile = ovl_do_tmpfile(ofs, ofs->workdir, S_IFREG | 0);
1178 ofs->tmpfile = !IS_ERR(tmpfile);
1179 if (ofs->tmpfile)
1180 fput(tmpfile);
1181 else
1182 pr_warn("upper fs does not support tmpfile.\n");
1183
1184
1185 /* Check if upper/work fs supports RENAME_WHITEOUT */
1186 err = ovl_check_rename_whiteout(ofs);
1187 if (err < 0 && err != -ENOSPC)
1188 goto out;
1189
1190 rename_whiteout = err > 0;
1191 if (!rename_whiteout)
> 1192 pr_warn("upper fs does not support RENAME_WHITEOUT (%i).\n,
1193 err");
1194
1195 /*
1196 * Check if upper/work fs supports (trusted|user).overlay.* xattr
1197 */
1198 err = ovl_setxattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE, "0", 1);
1199 if (err) {
1200 pr_warn("failed to set xattr on upper\n");
1201 ofs->noxattr = true;
1202 if (ovl_redirect_follow(ofs)) {
1203 ofs->config.redirect_mode = OVL_REDIRECT_NOFOLLOW;
1204 pr_warn("...falling back to redirect_dir=nofollow.\n");
1205 }
1206 if (ofs->config.metacopy) {
1207 ofs->config.metacopy = false;
1208 pr_warn("...falling back to metacopy=off.\n");
1209 }
1210 if (ofs->config.index) {
1211 ofs->config.index = false;
1212 pr_warn("...falling back to index=off.\n");
1213 }
1214 /*
1215 * xattr support is required for persistent st_ino.
1216 * Without persistent st_ino, xino=auto falls back to xino=off.
1217 */
1218 if (ofs->config.xino == OVL_XINO_AUTO) {
1219 ofs->config.xino = OVL_XINO_OFF;
1220 pr_warn("...falling back to xino=off.\n");
1221 }
1222 if (err == -EPERM && !ofs->config.userxattr)
1223 pr_info("try mounting with 'userxattr' option\n");
1224 err = 0;
1225 } else {
1226 ovl_removexattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE);
1227 }
1228
1229 /*
1230 * We allowed sub-optimal upper fs configuration and don't want to break
1231 * users over kernel upgrade, but we never allowed remote upper fs, so
1232 * we can enforce strict requirements for remote upper fs.
1233 */
1234 if (ovl_dentry_remote(ofs->workdir) &&
1235 (!d_type || !rename_whiteout || ofs->noxattr)) {
1236 pr_err("upper fs missing required features.\n");
1237 err = -EINVAL;
1238 goto out;
1239 }
1240
1241 /*
1242 * For volatile mount, create a incompat/volatile/dirty file to keep
1243 * track of it.
1244 */
1245 if (ofs->config.ovl_volatile) {
1246 err = ovl_create_volatile_dirty(ofs);
1247 if (err < 0) {
1248 pr_err("Failed to create volatile/dirty file.\n");
1249 goto out;
1250 }
1251 }
1252
1253 /* Check if upper/work fs supports file handles */
1254 fh_type = ovl_can_decode_fh(ofs->workdir->d_sb);
1255 if (ofs->config.index && !fh_type) {
1256 ofs->config.index = false;
1257 pr_warn("upper fs does not support file handles, falling back to index=off.\n");
1258 }
1259
1260 /* Check if upper fs has 32bit inode numbers */
1261 if (fh_type != FILEID_INO32_GEN)
1262 ofs->xino_mode = -1;
1263
1264 /* NFS export of r/w mount depends on index */
1265 if (ofs->config.nfs_export && !ofs->config.index) {
1266 pr_warn("NFS export requires \"index=on\", falling back to nfs_export=off.\n");
1267 ofs->config.nfs_export = false;
1268 }
1269 out:
1270 mnt_drop_write(mnt);
1271 return err;
1272 }
1273
--
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