216 static void ovl_free_fs(struct ovl_fs *ofs)  in ovl_free_fs()  argument
220 	dput(ofs->indexdir);  in ovl_free_fs()
221 	dput(ofs->workdir);  in ovl_free_fs()
222 	if (ofs->workdir_locked)  in ovl_free_fs()
223 		ovl_inuse_unlock(ofs->workbasedir);  in ovl_free_fs()
224 	dput(ofs->workbasedir);  in ovl_free_fs()
225 	if (ofs->upperdir_locked)  in ovl_free_fs()
226 		ovl_inuse_unlock(ofs->upper_mnt->mnt_root);  in ovl_free_fs()
227 	mntput(ofs->upper_mnt);  in ovl_free_fs()
228 	for (i = 0; i < ofs->numlower; i++)  in ovl_free_fs()
229 		mntput(ofs->lower_layers[i].mnt);  in ovl_free_fs()
230 	for (i = 0; i < ofs->numlowerfs; i++)  in ovl_free_fs()
231 		free_anon_bdev(ofs->lower_fs[i].pseudo_dev);  in ovl_free_fs()
232 	kfree(ofs->lower_layers);  in ovl_free_fs()
233 	kfree(ofs->lower_fs);  in ovl_free_fs()
235 	kfree(ofs->config.lowerdir);  in ovl_free_fs()
236 	kfree(ofs->config.upperdir);  in ovl_free_fs()
237 	kfree(ofs->config.workdir);  in ovl_free_fs()
238 	kfree(ofs->config.redirect_mode);  in ovl_free_fs()
239 	if (ofs->creator_cred)  in ovl_free_fs()
240 		put_cred(ofs->creator_cred);  in ovl_free_fs()
241 	kfree(ofs);  in ovl_free_fs()
246 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_put_super()  local
248 	ovl_free_fs(ofs);  in ovl_put_super()
254 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_sync_fs()  local
258 	if (!ofs->upper_mnt)  in ovl_sync_fs()
272 	upper_sb = ofs->upper_mnt->mnt_sb;  in ovl_sync_fs()
291 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;  in ovl_statfs()  local
300 		buf->f_namelen = ofs->namelen;  in ovl_statfs()
308 static bool ovl_force_readonly(struct ovl_fs *ofs)  in ovl_force_readonly()  argument
310 	return (!ofs->upper_mnt || !ofs->workdir);  in ovl_force_readonly()
344 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_show_options()  local
346 	seq_show_option(m, "lowerdir", ofs->config.lowerdir);  in ovl_show_options()
347 	if (ofs->config.upperdir) {  in ovl_show_options()
348 		seq_show_option(m, "upperdir", ofs->config.upperdir);  in ovl_show_options()
349 		seq_show_option(m, "workdir", ofs->config.workdir);  in ovl_show_options()
351 	if (ofs->config.default_permissions)  in ovl_show_options()
353 	if (strcmp(ofs->config.redirect_mode, ovl_redirect_mode_def()) != 0)  in ovl_show_options()
354 		seq_printf(m, ",redirect_dir=%s", ofs->config.redirect_mode);  in ovl_show_options()
355 	if (ofs->config.index != ovl_index_def)  in ovl_show_options()
356 		seq_printf(m, ",index=%s", ofs->config.index ? "on" : "off");  in ovl_show_options()
357 	if (ofs->config.nfs_export != ovl_nfs_export_def)  in ovl_show_options()
358 		seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ?  in ovl_show_options()
360 	if (ofs->config.xino != ovl_xino_def())  in ovl_show_options()
361 		seq_printf(m, ",xino=%s", ovl_xino_str[ofs->config.xino]);  in ovl_show_options()
362 	if (ofs->config.metacopy != ovl_metacopy_def)  in ovl_show_options()
364 			   ofs->config.metacopy ? "on" : "off");  in ovl_show_options()
370 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_remount()  local
372 	if (!(*flags & SB_RDONLY) && ovl_force_readonly(ofs))  in ovl_remount()
590 static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,  in ovl_workdir_create()  argument
593 	struct inode *dir =  ofs->workbasedir->d_inode;  in ovl_workdir_create()
594 	struct vfsmount *mnt = ofs->upper_mnt;  in ovl_workdir_create()
604 	work = lookup_one_len(name, ofs->workbasedir, strlen(name));  in ovl_workdir_create()
672 		ofs->config.workdir, name, -err);  in ovl_workdir_create()
741 static int ovl_check_namelen(struct path *path, struct ovl_fs *ofs,  in ovl_check_namelen()  argument
750 		ofs->namelen = max(ofs->namelen, statfs.f_namelen);  in ovl_check_namelen()
756 			 struct ovl_fs *ofs, int *stack_depth, bool *remote)  in ovl_lower_dir()  argument
765 	err = ovl_check_namelen(path, ofs, name);  in ovl_lower_dir()
779 	if ((ofs->config.nfs_export ||  in ovl_lower_dir()
780 	     (ofs->config.index && ofs->config.upperdir)) && !fh_type) {  in ovl_lower_dir()
781 		ofs->config.index = false;  in ovl_lower_dir()
782 		ofs->config.nfs_export = false;  in ovl_lower_dir()
789 		ofs->xino_bits = 0;  in ovl_lower_dir()
965 static int ovl_get_upper(struct ovl_fs *ofs, struct path *upperpath)  in ovl_get_upper()  argument
970 	err = ovl_mount_dir(ofs->config.upperdir, upperpath);  in ovl_get_upper()
981 	err = ovl_check_namelen(upperpath, ofs, ofs->config.upperdir);  in ovl_get_upper()
994 	ofs->upper_mnt = upper_mnt;  in ovl_get_upper()
997 	if (ovl_inuse_trylock(ofs->upper_mnt->mnt_root)) {  in ovl_get_upper()
998 		ofs->upperdir_locked = true;  in ovl_get_upper()
999 	} else if (ofs->config.index) {  in ovl_get_upper()
1011 static int ovl_make_workdir(struct ovl_fs *ofs, struct path *workpath)  in ovl_make_workdir()  argument
1013 	struct vfsmount *mnt = ofs->upper_mnt;  in ovl_make_workdir()
1022 	ofs->workdir = ovl_workdir_create(ofs, OVL_WORKDIR_NAME, false);  in ovl_make_workdir()
1023 	if (!ofs->workdir)  in ovl_make_workdir()
1044 	temp = ovl_do_tmpfile(ofs->workdir, S_IFREG | 0);  in ovl_make_workdir()
1045 	ofs->tmpfile = !IS_ERR(temp);  in ovl_make_workdir()
1046 	if (ofs->tmpfile)  in ovl_make_workdir()
1054 	err = ovl_do_setxattr(ofs->workdir, OVL_XATTR_OPAQUE, "0", 1, 0);  in ovl_make_workdir()
1056 		ofs->noxattr = true;  in ovl_make_workdir()
1057 		ofs->config.index = false;  in ovl_make_workdir()
1058 		ofs->config.metacopy = false;  in ovl_make_workdir()
1062 		vfs_removexattr(ofs->workdir, OVL_XATTR_OPAQUE);  in ovl_make_workdir()
1066 	fh_type = ovl_can_decode_fh(ofs->workdir->d_sb);  in ovl_make_workdir()
1067 	if (ofs->config.index && !fh_type) {  in ovl_make_workdir()
1068 		ofs->config.index = false;  in ovl_make_workdir()
1074 		ofs->xino_bits = 0;  in ovl_make_workdir()
1077 	if (ofs->config.nfs_export && !ofs->config.index) {  in ovl_make_workdir()
1079 		ofs->config.nfs_export = false;  in ovl_make_workdir()
1086 static int ovl_get_workdir(struct ovl_fs *ofs, struct path *upperpath)  in ovl_get_workdir()  argument
1091 	err = ovl_mount_dir(ofs->config.workdir, &workpath);  in ovl_get_workdir()
1105 	ofs->workbasedir = dget(workpath.dentry);  in ovl_get_workdir()
1108 	if (ovl_inuse_trylock(ofs->workbasedir)) {  in ovl_get_workdir()
1109 		ofs->workdir_locked = true;  in ovl_get_workdir()
1110 	} else if (ofs->config.index) {  in ovl_get_workdir()
1117 	err = ovl_make_workdir(ofs, &workpath);  in ovl_get_workdir()
1128 static int ovl_get_indexdir(struct ovl_fs *ofs, struct ovl_entry *oe,  in ovl_get_indexdir()  argument
1131 	struct vfsmount *mnt = ofs->upper_mnt;  in ovl_get_indexdir()
1146 	ofs->indexdir = ovl_workdir_create(ofs, OVL_INDEXDIR_NAME, true);  in ovl_get_indexdir()
1147 	if (ofs->indexdir) {  in ovl_get_indexdir()
1156 		if (ovl_check_origin_xattr(ofs->indexdir)) {  in ovl_get_indexdir()
1157 			err = ovl_verify_set_fh(ofs->indexdir, OVL_XATTR_ORIGIN,  in ovl_get_indexdir()
1162 		err = ovl_verify_upper(ofs->indexdir, upperpath->dentry, true);  in ovl_get_indexdir()
1168 			err = ovl_indexdir_cleanup(ofs);  in ovl_get_indexdir()
1170 	if (err || !ofs->indexdir)  in ovl_get_indexdir()
1179 static int ovl_get_fsid(struct ovl_fs *ofs, struct super_block *sb)  in ovl_get_fsid()  argument
1186 	if (ofs->upper_mnt && ofs->upper_mnt->mnt_sb == sb)  in ovl_get_fsid()
1189 	for (i = 0; i < ofs->numlowerfs; i++) {  in ovl_get_fsid()
1190 		if (ofs->lower_fs[i].sb == sb)  in ovl_get_fsid()
1200 	ofs->lower_fs[ofs->numlowerfs].sb = sb;  in ovl_get_fsid()
1201 	ofs->lower_fs[ofs->numlowerfs].pseudo_dev = dev;  in ovl_get_fsid()
1202 	ofs->numlowerfs++;  in ovl_get_fsid()
1204 	return ofs->numlowerfs;  in ovl_get_fsid()
1207 static int ovl_get_lower_layers(struct ovl_fs *ofs, struct path *stack,  in ovl_get_lower_layers()  argument
1214 	ofs->lower_layers = kcalloc(numlower, sizeof(struct ovl_layer),  in ovl_get_lower_layers()
1216 	if (ofs->lower_layers == NULL)  in ovl_get_lower_layers()
1219 	ofs->lower_fs = kcalloc(numlower, sizeof(struct ovl_sb),  in ovl_get_lower_layers()
1221 	if (ofs->lower_fs == NULL)  in ovl_get_lower_layers()
1228 		err = fsid = ovl_get_fsid(ofs, stack[i].mnt->mnt_sb);  in ovl_get_lower_layers()
1245 		ofs->lower_layers[ofs->numlower].mnt = mnt;  in ovl_get_lower_layers()
1246 		ofs->lower_layers[ofs->numlower].idx = i + 1;  in ovl_get_lower_layers()
1247 		ofs->lower_layers[ofs->numlower].fsid = fsid;  in ovl_get_lower_layers()
1249 			ofs->lower_layers[ofs->numlower].fs =  in ovl_get_lower_layers()
1250 				&ofs->lower_fs[fsid - 1];  in ovl_get_lower_layers()
1252 		ofs->numlower++;  in ovl_get_lower_layers()
1263 	if (!ofs->numlowerfs || (ofs->numlowerfs == 1 && !ofs->upper_mnt)) {  in ovl_get_lower_layers()
1264 		ofs->xino_bits = 0;  in ovl_get_lower_layers()
1265 		ofs->config.xino = OVL_XINO_OFF;  in ovl_get_lower_layers()
1266 	} else if (ofs->config.xino == OVL_XINO_ON && !ofs->xino_bits) {  in ovl_get_lower_layers()
1273 		ofs->xino_bits = ilog2(ofs->numlowerfs) + 1;  in ovl_get_lower_layers()
1276 	if (ofs->xino_bits) {  in ovl_get_lower_layers()
1278 			ofs->xino_bits);  in ovl_get_lower_layers()
1287 					    struct ovl_fs *ofs)  in ovl_get_lowerstack()  argument
1297 	lowertmp = kstrdup(ofs->config.lowerdir, GFP_KERNEL);  in ovl_get_lowerstack()
1307 	} else if (!ofs->config.upperdir && stacklen == 1) {  in ovl_get_lowerstack()
1310 	} else if (!ofs->config.upperdir && ofs->config.nfs_export &&  in ovl_get_lowerstack()
1311 		   ofs->config.redirect_follow) {  in ovl_get_lowerstack()
1313 		ofs->config.nfs_export = false;  in ovl_get_lowerstack()
1324 		err = ovl_lower_dir(lower, &stack[numlower], ofs,  in ovl_get_lowerstack()
1339 	err = ovl_get_lower_layers(ofs, stack, numlower);  in ovl_get_lowerstack()
1350 		oe->lowerstack[i].layer = &ofs->lower_layers[i];  in ovl_get_lowerstack()
1376 	struct ovl_fs *ofs;  in ovl_fill_super()  local
1381 	ofs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);  in ovl_fill_super()
1382 	if (!ofs)  in ovl_fill_super()
1385 	ofs->creator_cred = cred = prepare_creds();  in ovl_fill_super()
1389 	ofs->config.index = ovl_index_def;  in ovl_fill_super()
1390 	ofs->config.nfs_export = ovl_nfs_export_def;  in ovl_fill_super()
1391 	ofs->config.xino = ovl_xino_def();  in ovl_fill_super()
1392 	ofs->config.metacopy = ovl_metacopy_def;  in ovl_fill_super()
1393 	err = ovl_parse_opt((char *) data, &ofs->config);  in ovl_fill_super()
1398 	if (!ofs->config.lowerdir) {  in ovl_fill_super()
1407 	if (ofs->config.xino != OVL_XINO_OFF)  in ovl_fill_super()
1408 		ofs->xino_bits = BITS_PER_LONG - 32;  in ovl_fill_super()
1410 	if (ofs->config.upperdir) {  in ovl_fill_super()
1411 		if (!ofs->config.workdir) {  in ovl_fill_super()
1416 		err = ovl_get_upper(ofs, &upperpath);  in ovl_fill_super()
1420 		err = ovl_get_workdir(ofs, &upperpath);  in ovl_fill_super()
1424 		if (!ofs->workdir)  in ovl_fill_super()
1427 		sb->s_stack_depth = ofs->upper_mnt->mnt_sb->s_stack_depth;  in ovl_fill_super()
1428 		sb->s_time_gran = ofs->upper_mnt->mnt_sb->s_time_gran;  in ovl_fill_super()
1431 	oe = ovl_get_lowerstack(sb, ofs);  in ovl_fill_super()
1437 	if (!ofs->upper_mnt)  in ovl_fill_super()
1440 	if (!(ovl_force_readonly(ofs)) && ofs->config.index) {  in ovl_fill_super()
1441 		err = ovl_get_indexdir(ofs, oe, &upperpath);  in ovl_fill_super()
1446 		if (!ofs->indexdir) {  in ovl_fill_super()
1447 			dput(ofs->workdir);  in ovl_fill_super()
1448 			ofs->workdir = NULL;  in ovl_fill_super()
1455 	if (!ofs->indexdir) {  in ovl_fill_super()
1456 		ofs->config.index = false;  in ovl_fill_super()
1457 		if (ofs->upper_mnt && ofs->config.nfs_export) {  in ovl_fill_super()
1459 			ofs->config.nfs_export = false;  in ovl_fill_super()
1463 	if (ofs->config.metacopy && ofs->config.nfs_export) {  in ovl_fill_super()
1465 		ofs->config.nfs_export = false;  in ovl_fill_super()
1468 	if (ofs->config.nfs_export)  in ovl_fill_super()
1477 	sb->s_fs_info = ofs;  in ovl_fill_super()
1510 	ovl_free_fs(ofs);  in ovl_fill_super()