211 static void ovl_free_fs(struct ovl_fs *ofs)  in ovl_free_fs()  argument
215 	iput(ofs->workbasedir_trap);  in ovl_free_fs()
216 	iput(ofs->indexdir_trap);  in ovl_free_fs()
217 	iput(ofs->workdir_trap);  in ovl_free_fs()
218 	iput(ofs->upperdir_trap);  in ovl_free_fs()
219 	dput(ofs->indexdir);  in ovl_free_fs()
220 	dput(ofs->workdir);  in ovl_free_fs()
221 	if (ofs->workdir_locked)  in ovl_free_fs()
222 		ovl_inuse_unlock(ofs->workbasedir);  in ovl_free_fs()
223 	dput(ofs->workbasedir);  in ovl_free_fs()
224 	if (ofs->upperdir_locked)  in ovl_free_fs()
225 		ovl_inuse_unlock(ofs->upper_mnt->mnt_root);  in ovl_free_fs()
226 	mntput(ofs->upper_mnt);  in ovl_free_fs()
227 	for (i = 0; i < ofs->numlower; i++) {  in ovl_free_fs()
228 		iput(ofs->lower_layers[i].trap);  in ovl_free_fs()
229 		mntput(ofs->lower_layers[i].mnt);  in ovl_free_fs()
231 	for (i = 0; i < ofs->numlowerfs; i++)  in ovl_free_fs()
232 		free_anon_bdev(ofs->lower_fs[i].pseudo_dev);  in ovl_free_fs()
233 	kfree(ofs->lower_layers);  in ovl_free_fs()
234 	kfree(ofs->lower_fs);  in ovl_free_fs()
236 	kfree(ofs->config.lowerdir);  in ovl_free_fs()
237 	kfree(ofs->config.upperdir);  in ovl_free_fs()
238 	kfree(ofs->config.workdir);  in ovl_free_fs()
239 	kfree(ofs->config.redirect_mode);  in ovl_free_fs()
240 	if (ofs->creator_cred)  in ovl_free_fs()
241 		put_cred(ofs->creator_cred);  in ovl_free_fs()
242 	kfree(ofs);  in ovl_free_fs()
247 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_put_super()  local
249 	ovl_free_fs(ofs);  in ovl_put_super()
255 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_sync_fs()  local
259 	if (!ofs->upper_mnt)  in ovl_sync_fs()
273 	upper_sb = ofs->upper_mnt->mnt_sb;  in ovl_sync_fs()
292 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;  in ovl_statfs()  local
301 		buf->f_namelen = ofs->namelen;  in ovl_statfs()
309 static bool ovl_force_readonly(struct ovl_fs *ofs)  in ovl_force_readonly()  argument
311 	return (!ofs->upper_mnt || !ofs->workdir);  in ovl_force_readonly()
345 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_show_options()  local
347 	seq_show_option(m, "lowerdir", ofs->config.lowerdir);  in ovl_show_options()
348 	if (ofs->config.upperdir) {  in ovl_show_options()
349 		seq_show_option(m, "upperdir", ofs->config.upperdir);  in ovl_show_options()
350 		seq_show_option(m, "workdir", ofs->config.workdir);  in ovl_show_options()
352 	if (ofs->config.default_permissions)  in ovl_show_options()
354 	if (strcmp(ofs->config.redirect_mode, ovl_redirect_mode_def()) != 0)  in ovl_show_options()
355 		seq_printf(m, ",redirect_dir=%s", ofs->config.redirect_mode);  in ovl_show_options()
356 	if (ofs->config.index != ovl_index_def)  in ovl_show_options()
357 		seq_printf(m, ",index=%s", ofs->config.index ? "on" : "off");  in ovl_show_options()
358 	if (ofs->config.nfs_export != ovl_nfs_export_def)  in ovl_show_options()
359 		seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ?  in ovl_show_options()
361 	if (ofs->config.xino != ovl_xino_def())  in ovl_show_options()
362 		seq_printf(m, ",xino=%s", ovl_xino_str[ofs->config.xino]);  in ovl_show_options()
363 	if (ofs->config.metacopy != ovl_metacopy_def)  in ovl_show_options()
365 			   ofs->config.metacopy ? "on" : "off");  in ovl_show_options()
371 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_remount()  local
373 	if (!(*flags & SB_RDONLY) && ovl_force_readonly(ofs))  in ovl_remount()
614 static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,  in ovl_workdir_create()  argument
617 	struct inode *dir =  ofs->workbasedir->d_inode;  in ovl_workdir_create()
618 	struct vfsmount *mnt = ofs->upper_mnt;  in ovl_workdir_create()
628 	work = lookup_one_len(name, ofs->workbasedir, strlen(name));  in ovl_workdir_create()
696 		ofs->config.workdir, name, -err);  in ovl_workdir_create()
765 static int ovl_check_namelen(struct path *path, struct ovl_fs *ofs,  in ovl_check_namelen()  argument
774 		ofs->namelen = max(ofs->namelen, statfs.f_namelen);  in ovl_check_namelen()
780 			 struct ovl_fs *ofs, int *stack_depth, bool *remote)  in ovl_lower_dir()  argument
789 	err = ovl_check_namelen(path, ofs, name);  in ovl_lower_dir()
803 	if ((ofs->config.nfs_export ||  in ovl_lower_dir()
804 	     (ofs->config.index && ofs->config.upperdir)) && !fh_type) {  in ovl_lower_dir()
805 		ofs->config.index = false;  in ovl_lower_dir()
806 		ofs->config.nfs_export = false;  in ovl_lower_dir()
813 		ofs->xino_bits = 0;  in ovl_lower_dir()
1013 static int ovl_report_in_use(struct ovl_fs *ofs, const char *name)  in ovl_report_in_use()  argument
1015 	if (ofs->config.index) {  in ovl_report_in_use()
1026 static int ovl_get_upper(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_upper()  argument
1032 	err = ovl_mount_dir(ofs->config.upperdir, upperpath);  in ovl_get_upper()
1043 	err = ovl_check_namelen(upperpath, ofs, ofs->config.upperdir);  in ovl_get_upper()
1047 	err = ovl_setup_trap(sb, upperpath->dentry, &ofs->upperdir_trap,  in ovl_get_upper()
1061 	ofs->upper_mnt = upper_mnt;  in ovl_get_upper()
1063 	if (ovl_inuse_trylock(ofs->upper_mnt->mnt_root)) {  in ovl_get_upper()
1064 		ofs->upperdir_locked = true;  in ovl_get_upper()
1066 		err = ovl_report_in_use(ofs, "upperdir");  in ovl_get_upper()
1076 static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs,  in ovl_make_workdir()  argument
1079 	struct vfsmount *mnt = ofs->upper_mnt;  in ovl_make_workdir()
1088 	ofs->workdir = ovl_workdir_create(ofs, OVL_WORKDIR_NAME, false);  in ovl_make_workdir()
1089 	if (!ofs->workdir)  in ovl_make_workdir()
1092 	err = ovl_setup_trap(sb, ofs->workdir, &ofs->workdir_trap, "workdir");  in ovl_make_workdir()
1114 	temp = ovl_do_tmpfile(ofs->workdir, S_IFREG | 0);  in ovl_make_workdir()
1115 	ofs->tmpfile = !IS_ERR(temp);  in ovl_make_workdir()
1116 	if (ofs->tmpfile)  in ovl_make_workdir()
1124 	err = ovl_do_setxattr(ofs->workdir, OVL_XATTR_OPAQUE, "0", 1, 0);  in ovl_make_workdir()
1126 		ofs->noxattr = true;  in ovl_make_workdir()
1127 		ofs->config.index = false;  in ovl_make_workdir()
1128 		ofs->config.metacopy = false;  in ovl_make_workdir()
1132 		vfs_removexattr(ofs->workdir, OVL_XATTR_OPAQUE);  in ovl_make_workdir()
1136 	fh_type = ovl_can_decode_fh(ofs->workdir->d_sb);  in ovl_make_workdir()
1137 	if (ofs->config.index && !fh_type) {  in ovl_make_workdir()
1138 		ofs->config.index = false;  in ovl_make_workdir()
1144 		ofs->xino_bits = 0;  in ovl_make_workdir()
1147 	if (ofs->config.nfs_export && !ofs->config.index) {  in ovl_make_workdir()
1149 		ofs->config.nfs_export = false;  in ovl_make_workdir()
1156 static int ovl_get_workdir(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_workdir()  argument
1162 	err = ovl_mount_dir(ofs->config.workdir, &workpath);  in ovl_get_workdir()
1176 	ofs->workbasedir = dget(workpath.dentry);  in ovl_get_workdir()
1178 	if (ovl_inuse_trylock(ofs->workbasedir)) {  in ovl_get_workdir()
1179 		ofs->workdir_locked = true;  in ovl_get_workdir()
1181 		err = ovl_report_in_use(ofs, "workdir");  in ovl_get_workdir()
1186 	err = ovl_setup_trap(sb, ofs->workbasedir, &ofs->workbasedir_trap,  in ovl_get_workdir()
1191 	err = ovl_make_workdir(sb, ofs, &workpath);  in ovl_get_workdir()
1199 static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_indexdir()  argument
1202 	struct vfsmount *mnt = ofs->upper_mnt;  in ovl_get_indexdir()
1217 	ofs->indexdir = ovl_workdir_create(ofs, OVL_INDEXDIR_NAME, true);  in ovl_get_indexdir()
1218 	if (ofs->indexdir) {  in ovl_get_indexdir()
1219 		err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap,  in ovl_get_indexdir()
1232 		if (ovl_check_origin_xattr(ofs->indexdir)) {  in ovl_get_indexdir()
1233 			err = ovl_verify_set_fh(ofs->indexdir, OVL_XATTR_ORIGIN,  in ovl_get_indexdir()
1238 		err = ovl_verify_upper(ofs->indexdir, upperpath->dentry, true);  in ovl_get_indexdir()
1244 			err = ovl_indexdir_cleanup(ofs);  in ovl_get_indexdir()
1246 	if (err || !ofs->indexdir)  in ovl_get_indexdir()
1254 static bool ovl_lower_uuid_ok(struct ovl_fs *ofs, const uuid_t *uuid)  in ovl_lower_uuid_ok()  argument
1258 	if (!ofs->config.nfs_export && !(ofs->config.index && ofs->upper_mnt))  in ovl_lower_uuid_ok()
1261 	for (i = 0; i < ofs->numlowerfs; i++) {  in ovl_lower_uuid_ok()
1267 		if (uuid_equal(&ofs->lower_fs[i].sb->s_uuid, uuid))  in ovl_lower_uuid_ok()
1274 static int ovl_get_fsid(struct ovl_fs *ofs, const struct path *path)  in ovl_get_fsid()  argument
1282 	if (ofs->upper_mnt && ofs->upper_mnt->mnt_sb == sb)  in ovl_get_fsid()
1285 	for (i = 0; i < ofs->numlowerfs; i++) {  in ovl_get_fsid()
1286 		if (ofs->lower_fs[i].sb == sb)  in ovl_get_fsid()
1290 	if (!ovl_lower_uuid_ok(ofs, &sb->s_uuid)) {  in ovl_get_fsid()
1291 		ofs->config.index = false;  in ovl_get_fsid()
1292 		ofs->config.nfs_export = false;  in ovl_get_fsid()
1304 	ofs->lower_fs[ofs->numlowerfs].sb = sb;  in ovl_get_fsid()
1305 	ofs->lower_fs[ofs->numlowerfs].pseudo_dev = dev;  in ovl_get_fsid()
1306 	ofs->numlowerfs++;  in ovl_get_fsid()
1308 	return ofs->numlowerfs;  in ovl_get_fsid()
1311 static int ovl_get_lower_layers(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_lower_layers()  argument
1318 	ofs->lower_layers = kcalloc(numlower, sizeof(struct ovl_layer),  in ovl_get_lower_layers()
1320 	if (ofs->lower_layers == NULL)  in ovl_get_lower_layers()
1323 	ofs->lower_fs = kcalloc(numlower, sizeof(struct ovl_sb),  in ovl_get_lower_layers()
1325 	if (ofs->lower_fs == NULL)  in ovl_get_lower_layers()
1333 		err = fsid = ovl_get_fsid(ofs, &stack[i]);  in ovl_get_lower_layers()
1342 			err = ovl_report_in_use(ofs, "lowerdir");  in ovl_get_lower_layers()
1361 		ofs->lower_layers[ofs->numlower].trap = trap;  in ovl_get_lower_layers()
1362 		ofs->lower_layers[ofs->numlower].mnt = mnt;  in ovl_get_lower_layers()
1363 		ofs->lower_layers[ofs->numlower].idx = i + 1;  in ovl_get_lower_layers()
1364 		ofs->lower_layers[ofs->numlower].fsid = fsid;  in ovl_get_lower_layers()
1366 			ofs->lower_layers[ofs->numlower].fs =  in ovl_get_lower_layers()
1367 				&ofs->lower_fs[fsid - 1];  in ovl_get_lower_layers()
1369 		ofs->numlower++;  in ovl_get_lower_layers()
1380 	if (!ofs->numlowerfs || (ofs->numlowerfs == 1 && !ofs->upper_mnt)) {  in ovl_get_lower_layers()
1381 		ofs->xino_bits = 0;  in ovl_get_lower_layers()
1382 		ofs->config.xino = OVL_XINO_OFF;  in ovl_get_lower_layers()
1383 	} else if (ofs->config.xino == OVL_XINO_ON && !ofs->xino_bits) {  in ovl_get_lower_layers()
1390 		ofs->xino_bits = ilog2(ofs->numlowerfs) + 1;  in ovl_get_lower_layers()
1393 	if (ofs->xino_bits) {  in ovl_get_lower_layers()
1395 			ofs->xino_bits);  in ovl_get_lower_layers()
1404 					    struct ovl_fs *ofs)  in ovl_get_lowerstack()  argument
1414 	lowertmp = kstrdup(ofs->config.lowerdir, GFP_KERNEL);  in ovl_get_lowerstack()
1424 	} else if (!ofs->config.upperdir && stacklen == 1) {  in ovl_get_lowerstack()
1427 	} else if (!ofs->config.upperdir && ofs->config.nfs_export &&  in ovl_get_lowerstack()
1428 		   ofs->config.redirect_follow) {  in ovl_get_lowerstack()
1430 		ofs->config.nfs_export = false;  in ovl_get_lowerstack()
1441 		err = ovl_lower_dir(lower, &stack[numlower], ofs,  in ovl_get_lowerstack()
1456 	err = ovl_get_lower_layers(sb, ofs, stack, numlower);  in ovl_get_lowerstack()
1467 		oe->lowerstack[i].layer = &ofs->lower_layers[i];  in ovl_get_lowerstack()
1493 static int ovl_check_layer(struct super_block *sb, struct ovl_fs *ofs,  in ovl_check_layer()  argument
1510 			err = ovl_report_in_use(ofs, name);  in ovl_check_layer()
1526 					struct ovl_fs *ofs)  in ovl_check_overlapping_layers()  argument
1530 	if (ofs->upper_mnt) {  in ovl_check_overlapping_layers()
1531 		err = ovl_check_layer(sb, ofs, ofs->upper_mnt->mnt_root,  in ovl_check_overlapping_layers()
1543 		err = ovl_check_layer(sb, ofs, ofs->workbasedir, "workdir");  in ovl_check_overlapping_layers()
1548 	for (i = 0; i < ofs->numlower; i++) {  in ovl_check_overlapping_layers()
1549 		err = ovl_check_layer(sb, ofs,  in ovl_check_overlapping_layers()
1550 				      ofs->lower_layers[i].mnt->mnt_root,  in ovl_check_overlapping_layers()
1564 	struct ovl_fs *ofs;  in ovl_fill_super()  local
1569 	ofs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);  in ovl_fill_super()
1570 	if (!ofs)  in ovl_fill_super()
1573 	ofs->creator_cred = cred = prepare_creds();  in ovl_fill_super()
1577 	ofs->config.index = ovl_index_def;  in ovl_fill_super()
1578 	ofs->config.nfs_export = ovl_nfs_export_def;  in ovl_fill_super()
1579 	ofs->config.xino = ovl_xino_def();  in ovl_fill_super()
1580 	ofs->config.metacopy = ovl_metacopy_def;  in ovl_fill_super()
1581 	err = ovl_parse_opt((char *) data, &ofs->config);  in ovl_fill_super()
1586 	if (!ofs->config.lowerdir) {  in ovl_fill_super()
1595 	if (ofs->config.xino != OVL_XINO_OFF)  in ovl_fill_super()
1596 		ofs->xino_bits = BITS_PER_LONG - 32;  in ovl_fill_super()
1601 	if (ofs->config.upperdir) {  in ovl_fill_super()
1602 		if (!ofs->config.workdir) {  in ovl_fill_super()
1607 		err = ovl_get_upper(sb, ofs, &upperpath);  in ovl_fill_super()
1611 		err = ovl_get_workdir(sb, ofs, &upperpath);  in ovl_fill_super()
1615 		if (!ofs->workdir)  in ovl_fill_super()
1618 		sb->s_stack_depth = ofs->upper_mnt->mnt_sb->s_stack_depth;  in ovl_fill_super()
1619 		sb->s_time_gran = ofs->upper_mnt->mnt_sb->s_time_gran;  in ovl_fill_super()
1622 	oe = ovl_get_lowerstack(sb, ofs);  in ovl_fill_super()
1628 	if (!ofs->upper_mnt)  in ovl_fill_super()
1631 	if (!(ovl_force_readonly(ofs)) && ofs->config.index) {  in ovl_fill_super()
1632 		err = ovl_get_indexdir(sb, ofs, oe, &upperpath);  in ovl_fill_super()
1637 		if (!ofs->indexdir) {  in ovl_fill_super()
1638 			dput(ofs->workdir);  in ovl_fill_super()
1639 			ofs->workdir = NULL;  in ovl_fill_super()
1645 	err = ovl_check_overlapping_layers(sb, ofs);  in ovl_fill_super()
1650 	if (!ofs->indexdir) {  in ovl_fill_super()
1651 		ofs->config.index = false;  in ovl_fill_super()
1652 		if (ofs->upper_mnt && ofs->config.nfs_export) {  in ovl_fill_super()
1654 			ofs->config.nfs_export = false;  in ovl_fill_super()
1658 	if (ofs->config.metacopy && ofs->config.nfs_export) {  in ovl_fill_super()
1660 		ofs->config.nfs_export = false;  in ovl_fill_super()
1663 	if (ofs->config.nfs_export)  in ovl_fill_super()
1671 	sb->s_fs_info = ofs;  in ovl_fill_super()
1704 	ovl_free_fs(ofs);  in ovl_fill_super()