215 static void ovl_free_fs(struct ovl_fs *ofs)  in ovl_free_fs()  argument
220 	iput(ofs->workbasedir_trap);  in ovl_free_fs()
221 	iput(ofs->indexdir_trap);  in ovl_free_fs()
222 	iput(ofs->workdir_trap);  in ovl_free_fs()
223 	dput(ofs->whiteout);  in ovl_free_fs()
224 	dput(ofs->indexdir);  in ovl_free_fs()
225 	dput(ofs->workdir);  in ovl_free_fs()
226 	if (ofs->workdir_locked)  in ovl_free_fs()
227 		ovl_inuse_unlock(ofs->workbasedir);  in ovl_free_fs()
228 	dput(ofs->workbasedir);  in ovl_free_fs()
229 	if (ofs->upperdir_locked)  in ovl_free_fs()
230 		ovl_inuse_unlock(ovl_upper_mnt(ofs)->mnt_root);  in ovl_free_fs()
233 	mounts = (struct vfsmount **) ofs->layers;  in ovl_free_fs()
234 	for (i = 0; i < ofs->numlayer; i++) {  in ovl_free_fs()
235 		iput(ofs->layers[i].trap);  in ovl_free_fs()
236 		mounts[i] = ofs->layers[i].mnt;  in ovl_free_fs()
238 	kern_unmount_array(mounts, ofs->numlayer);  in ovl_free_fs()
239 	kfree(ofs->layers);  in ovl_free_fs()
240 	for (i = 0; i < ofs->numfs; i++)  in ovl_free_fs()
241 		free_anon_bdev(ofs->fs[i].pseudo_dev);  in ovl_free_fs()
242 	kfree(ofs->fs);  in ovl_free_fs()
244 	kfree(ofs->config.lowerdir);  in ovl_free_fs()
245 	kfree(ofs->config.upperdir);  in ovl_free_fs()
246 	kfree(ofs->config.workdir);  in ovl_free_fs()
247 	kfree(ofs->config.redirect_mode);  in ovl_free_fs()
248 	if (ofs->creator_cred)  in ovl_free_fs()
249 		put_cred(ofs->creator_cred);  in ovl_free_fs()
250 	kfree(ofs);  in ovl_free_fs()
255 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_put_super()  local
257 	ovl_free_fs(ofs);  in ovl_put_super()
263 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_sync_fs()  local
267 	ret = ovl_sync_status(ofs);  in ovl_sync_fs()
292 	upper_sb = ovl_upper_mnt(ofs)->mnt_sb;  in ovl_sync_fs()
311 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;  in ovl_statfs()  local
320 		buf->f_namelen = ofs->namelen;  in ovl_statfs()
328 static bool ovl_force_readonly(struct ovl_fs *ofs)  in ovl_force_readonly()  argument
330 	return (!ovl_upper_mnt(ofs) || !ofs->workdir);  in ovl_force_readonly()
358 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_show_options()  local
360 	seq_show_option(m, "lowerdir", ofs->config.lowerdir);  in ovl_show_options()
361 	if (ofs->config.upperdir) {  in ovl_show_options()
362 		seq_show_option(m, "upperdir", ofs->config.upperdir);  in ovl_show_options()
363 		seq_show_option(m, "workdir", ofs->config.workdir);  in ovl_show_options()
365 	if (ofs->config.default_permissions)  in ovl_show_options()
367 	if (strcmp(ofs->config.redirect_mode, ovl_redirect_mode_def()) != 0)  in ovl_show_options()
368 		seq_printf(m, ",redirect_dir=%s", ofs->config.redirect_mode);  in ovl_show_options()
369 	if (ofs->config.index != ovl_index_def)  in ovl_show_options()
370 		seq_printf(m, ",index=%s", ofs->config.index ? "on" : "off");  in ovl_show_options()
371 	if (!ofs->config.uuid)  in ovl_show_options()
373 	if (ofs->config.nfs_export != ovl_nfs_export_def)  in ovl_show_options()
374 		seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ?  in ovl_show_options()
376 	if (ofs->config.xino != ovl_xino_def() && !ovl_same_fs(sb))  in ovl_show_options()
377 		seq_printf(m, ",xino=%s", ovl_xino_str[ofs->config.xino]);  in ovl_show_options()
378 	if (ofs->config.metacopy != ovl_metacopy_def)  in ovl_show_options()
380 			   ofs->config.metacopy ? "on" : "off");  in ovl_show_options()
381 	if (ofs->config.ovl_volatile)  in ovl_show_options()
383 	if (ofs->config.userxattr)  in ovl_show_options()
390 	struct ovl_fs *ofs = sb->s_fs_info;  in ovl_remount()  local
394 	if (!(*flags & SB_RDONLY) && ovl_force_readonly(ofs))  in ovl_remount()
398 		upper_sb = ovl_upper_mnt(ofs)->mnt_sb;  in ovl_remount()
399 		if (ovl_should_sync(ofs)) {  in ovl_remount()
753 static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,  in ovl_workdir_create()  argument
756 	struct inode *dir =  ofs->workbasedir->d_inode;  in ovl_workdir_create()
757 	struct vfsmount *mnt = ovl_upper_mnt(ofs);  in ovl_workdir_create()
764 	work = lookup_one_len(name, ofs->workbasedir, strlen(name));  in ovl_workdir_create()
836 		ofs->config.workdir, name, -err);  in ovl_workdir_create()
908 static int ovl_check_namelen(struct path *path, struct ovl_fs *ofs,  in ovl_check_namelen()  argument
917 		ofs->namelen = max(ofs->namelen, statfs.f_namelen);  in ovl_check_namelen()
923 			 struct ovl_fs *ofs, int *stack_depth)  in ovl_lower_dir()  argument
932 	err = ovl_check_namelen(path, ofs, name);  in ovl_lower_dir()
943 	if ((ofs->config.nfs_export ||  in ovl_lower_dir()
944 	     (ofs->config.index && ofs->config.upperdir)) && !fh_type) {  in ovl_lower_dir()
945 		ofs->config.index = false;  in ovl_lower_dir()
946 		ofs->config.nfs_export = false;  in ovl_lower_dir()
954 	if (ofs->config.xino == OVL_XINO_AUTO &&  in ovl_lower_dir()
955 	    ofs->config.upperdir && !fh_type) {  in ovl_lower_dir()
956 		ofs->config.xino = OVL_XINO_OFF;  in ovl_lower_dir()
963 		ofs->xino_mode = -1;  in ovl_lower_dir()
1174 static int ovl_report_in_use(struct ovl_fs *ofs, const char *name)  in ovl_report_in_use()  argument
1176 	if (ofs->config.index) {  in ovl_report_in_use()
1187 static int ovl_get_upper(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_upper()  argument
1193 	err = ovl_mount_dir(ofs->config.upperdir, upperpath);  in ovl_get_upper()
1204 	err = ovl_check_namelen(upperpath, ofs, ofs->config.upperdir);  in ovl_get_upper()
1238 	if (ovl_inuse_trylock(ovl_upper_mnt(ofs)->mnt_root)) {  in ovl_get_upper()
1239 		ofs->upperdir_locked = true;  in ovl_get_upper()
1241 		err = ovl_report_in_use(ofs, "upperdir");  in ovl_get_upper()
1332 static int ovl_create_volatile_dirty(struct ovl_fs *ofs)  in ovl_create_volatile_dirty()  argument
1335 	struct dentry *d = dget(ofs->workbasedir);  in ovl_create_volatile_dirty()
1350 static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs,  in ovl_make_workdir()  argument
1353 	struct vfsmount *mnt = ovl_upper_mnt(ofs);  in ovl_make_workdir()
1364 	workdir = ovl_workdir_create(ofs, OVL_WORKDIR_NAME, false);  in ovl_make_workdir()
1369 	ofs->workdir = workdir;  in ovl_make_workdir()
1371 	err = ovl_setup_trap(sb, ofs->workdir, &ofs->workdir_trap, "workdir");  in ovl_make_workdir()
1390 	temp = ovl_do_tmpfile(ofs->workdir, S_IFREG | 0);  in ovl_make_workdir()
1391 	ofs->tmpfile = !IS_ERR(temp);  in ovl_make_workdir()
1392 	if (ofs->tmpfile)  in ovl_make_workdir()
1399 	err = ovl_check_rename_whiteout(ofs->workdir);  in ovl_make_workdir()
1410 	err = ovl_do_setxattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE, "0", 1);  in ovl_make_workdir()
1412 		ofs->noxattr = true;  in ovl_make_workdir()
1413 		if (ofs->config.index || ofs->config.metacopy) {  in ovl_make_workdir()
1414 			ofs->config.index = false;  in ovl_make_workdir()
1415 			ofs->config.metacopy = false;  in ovl_make_workdir()
1422 		if (ofs->config.xino == OVL_XINO_AUTO) {  in ovl_make_workdir()
1423 			ofs->config.xino = OVL_XINO_OFF;  in ovl_make_workdir()
1428 		ovl_do_removexattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE);  in ovl_make_workdir()
1436 	if (ovl_dentry_remote(ofs->workdir) &&  in ovl_make_workdir()
1437 	    (!d_type || !rename_whiteout || ofs->noxattr)) {  in ovl_make_workdir()
1447 	if (ofs->config.ovl_volatile) {  in ovl_make_workdir()
1448 		err = ovl_create_volatile_dirty(ofs);  in ovl_make_workdir()
1456 	fh_type = ovl_can_decode_fh(ofs->workdir->d_sb);  in ovl_make_workdir()
1457 	if (ofs->config.index && !fh_type) {  in ovl_make_workdir()
1458 		ofs->config.index = false;  in ovl_make_workdir()
1464 		ofs->xino_mode = -1;  in ovl_make_workdir()
1467 	if (ofs->config.nfs_export && !ofs->config.index) {  in ovl_make_workdir()
1469 		ofs->config.nfs_export = false;  in ovl_make_workdir()
1476 static int ovl_get_workdir(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_workdir()  argument
1482 	err = ovl_mount_dir(ofs->config.workdir, &workpath);  in ovl_get_workdir()
1496 	ofs->workbasedir = dget(workpath.dentry);  in ovl_get_workdir()
1498 	if (ovl_inuse_trylock(ofs->workbasedir)) {  in ovl_get_workdir()
1499 		ofs->workdir_locked = true;  in ovl_get_workdir()
1501 		err = ovl_report_in_use(ofs, "workdir");  in ovl_get_workdir()
1506 	err = ovl_setup_trap(sb, ofs->workbasedir, &ofs->workbasedir_trap,  in ovl_get_workdir()
1511 	err = ovl_make_workdir(sb, ofs, &workpath);  in ovl_get_workdir()
1519 static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_indexdir()  argument
1522 	struct vfsmount *mnt = ovl_upper_mnt(ofs);  in ovl_get_indexdir()
1531 	err = ovl_verify_origin(ofs, upperpath->dentry,  in ovl_get_indexdir()
1539 	iput(ofs->workdir_trap);  in ovl_get_indexdir()
1540 	ofs->workdir_trap = NULL;  in ovl_get_indexdir()
1541 	dput(ofs->workdir);  in ovl_get_indexdir()
1542 	ofs->workdir = NULL;  in ovl_get_indexdir()
1543 	indexdir = ovl_workdir_create(ofs, OVL_INDEXDIR_NAME, true);  in ovl_get_indexdir()
1547 		ofs->indexdir = indexdir;  in ovl_get_indexdir()
1548 		ofs->workdir = dget(indexdir);  in ovl_get_indexdir()
1550 		err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap,  in ovl_get_indexdir()
1563 		if (ovl_check_origin_xattr(ofs, ofs->indexdir)) {  in ovl_get_indexdir()
1564 			err = ovl_verify_set_fh(ofs, ofs->indexdir,  in ovl_get_indexdir()
1570 		err = ovl_verify_upper(ofs, ofs->indexdir, upperpath->dentry,  in ovl_get_indexdir()
1577 			err = ovl_indexdir_cleanup(ofs);  in ovl_get_indexdir()
1579 	if (err || !ofs->indexdir)  in ovl_get_indexdir()
1587 static bool ovl_lower_uuid_ok(struct ovl_fs *ofs, const uuid_t *uuid)  in ovl_lower_uuid_ok()  argument
1591 	if (!ofs->config.nfs_export && !ovl_upper_mnt(ofs))  in ovl_lower_uuid_ok()
1602 	if (ovl_allow_offline_changes(ofs) && uuid_is_null(uuid))  in ovl_lower_uuid_ok()
1605 	for (i = 0; i < ofs->numfs; i++) {  in ovl_lower_uuid_ok()
1613 		if (ofs->fs[i].is_lower &&  in ovl_lower_uuid_ok()
1614 		    uuid_equal(&ofs->fs[i].sb->s_uuid, uuid)) {  in ovl_lower_uuid_ok()
1615 			ofs->fs[i].bad_uuid = true;  in ovl_lower_uuid_ok()
1623 static int ovl_get_fsid(struct ovl_fs *ofs, const struct path *path)  in ovl_get_fsid()  argument
1632 	for (i = 0; i < ofs->numfs; i++) {  in ovl_get_fsid()
1633 		if (ofs->fs[i].sb == sb)  in ovl_get_fsid()
1637 	if (!ovl_lower_uuid_ok(ofs, &sb->s_uuid)) {  in ovl_get_fsid()
1639 		if (ofs->config.xino == OVL_XINO_AUTO) {  in ovl_get_fsid()
1640 			ofs->config.xino = OVL_XINO_OFF;  in ovl_get_fsid()
1643 		if (ofs->config.index || ofs->config.nfs_export) {  in ovl_get_fsid()
1644 			ofs->config.index = false;  in ovl_get_fsid()
1645 			ofs->config.nfs_export = false;  in ovl_get_fsid()
1652 				path->dentry, ovl_xino_str[ofs->config.xino]);  in ovl_get_fsid()
1662 	ofs->fs[ofs->numfs].sb = sb;  in ovl_get_fsid()
1663 	ofs->fs[ofs->numfs].pseudo_dev = dev;  in ovl_get_fsid()
1664 	ofs->fs[ofs->numfs].bad_uuid = bad_uuid;  in ovl_get_fsid()
1666 	return ofs->numfs++;  in ovl_get_fsid()
1669 static int ovl_get_layers(struct super_block *sb, struct ovl_fs *ofs,  in ovl_get_layers()  argument
1677 	ofs->fs = kcalloc(numlower + 1, sizeof(struct ovl_sb), GFP_KERNEL);  in ovl_get_layers()
1678 	if (ofs->fs == NULL)  in ovl_get_layers()
1682 	ofs->numfs++;  in ovl_get_layers()
1690 	err = get_anon_bdev(&ofs->fs[0].pseudo_dev);  in ovl_get_layers()
1696 	if (ovl_upper_mnt(ofs)) {  in ovl_get_layers()
1697 		ofs->fs[0].sb = ovl_upper_mnt(ofs)->mnt_sb;  in ovl_get_layers()
1698 		ofs->fs[0].is_lower = false;  in ovl_get_layers()
1706 		err = fsid = ovl_get_fsid(ofs, &stack[i]);  in ovl_get_layers()
1722 			err = ovl_report_in_use(ofs, "lowerdir");  in ovl_get_layers()
1743 		layers[ofs->numlayer].trap = trap;  in ovl_get_layers()
1744 		layers[ofs->numlayer].mnt = mnt;  in ovl_get_layers()
1745 		layers[ofs->numlayer].idx = ofs->numlayer;  in ovl_get_layers()
1746 		layers[ofs->numlayer].fsid = fsid;  in ovl_get_layers()
1747 		layers[ofs->numlayer].fs = &ofs->fs[fsid];  in ovl_get_layers()
1748 		ofs->numlayer++;  in ovl_get_layers()
1749 		ofs->fs[fsid].is_lower = true;  in ovl_get_layers()
1761 	if (ofs->numfs - !ovl_upper_mnt(ofs) == 1) {  in ovl_get_layers()
1762 		if (ofs->config.xino == OVL_XINO_ON)  in ovl_get_layers()
1764 		ofs->xino_mode = 0;  in ovl_get_layers()
1765 	} else if (ofs->config.xino == OVL_XINO_OFF) {  in ovl_get_layers()
1766 		ofs->xino_mode = -1;  in ovl_get_layers()
1767 	} else if (ofs->xino_mode < 0) {  in ovl_get_layers()
1776 		ofs->xino_mode = ilog2(ofs->numfs - 1) + 2;  in ovl_get_layers()
1779 	if (ofs->xino_mode > 0) {  in ovl_get_layers()
1781 			ofs->xino_mode);  in ovl_get_layers()
1791 				struct ovl_fs *ofs, struct ovl_layer *layers)  in ovl_get_lowerstack()  argument
1798 	if (!ofs->config.upperdir && numlower == 1) {  in ovl_get_lowerstack()
1809 		err = ovl_lower_dir(lower, &stack[i], ofs, &sb->s_stack_depth);  in ovl_get_lowerstack()
1823 	err = ovl_get_layers(sb, ofs, stack, numlower, layers);  in ovl_get_lowerstack()
1834 		oe->lowerstack[i].layer = &ofs->layers[i+1];  in ovl_get_lowerstack()
1854 static int ovl_check_layer(struct super_block *sb, struct ovl_fs *ofs,  in ovl_check_layer()  argument
1872 			err = ovl_report_in_use(ofs, name);  in ovl_check_layer()
1888 					struct ovl_fs *ofs)  in ovl_check_overlapping_layers()  argument
1892 	if (ovl_upper_mnt(ofs)) {  in ovl_check_overlapping_layers()
1893 		err = ovl_check_layer(sb, ofs, ovl_upper_mnt(ofs)->mnt_root,  in ovl_check_overlapping_layers()
1905 		err = ovl_check_layer(sb, ofs, ofs->workbasedir, "workdir",  in ovl_check_overlapping_layers()
1911 	for (i = 1; i < ofs->numlayer; i++) {  in ovl_check_overlapping_layers()
1912 		err = ovl_check_layer(sb, ofs,  in ovl_check_overlapping_layers()
1913 				      ofs->layers[i].mnt->mnt_root,  in ovl_check_overlapping_layers()
1965 	struct ovl_fs *ofs;  in ovl_fill_super()  local
1979 	ofs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);  in ovl_fill_super()
1980 	if (!ofs)  in ovl_fill_super()
1984 	ofs->creator_cred = cred = prepare_creds();  in ovl_fill_super()
1989 	ofs->share_whiteout = true;  in ovl_fill_super()
1991 	ofs->config.index = ovl_index_def;  in ovl_fill_super()
1992 	ofs->config.uuid = true;  in ovl_fill_super()
1993 	ofs->config.nfs_export = ovl_nfs_export_def;  in ovl_fill_super()
1994 	ofs->config.xino = ovl_xino_def();  in ovl_fill_super()
1995 	ofs->config.metacopy = ovl_metacopy_def;  in ovl_fill_super()
1996 	err = ovl_parse_opt((char *) data, &ofs->config);  in ovl_fill_super()
2001 	if (!ofs->config.lowerdir) {  in ovl_fill_super()
2008 	splitlower = kstrdup(ofs->config.lowerdir, GFP_KERNEL);  in ovl_fill_super()
2025 	ofs->layers = layers;  in ovl_fill_super()
2027 	ofs->numlayer = 1;  in ovl_fill_super()
2031 	atomic_long_set(&ofs->last_ino, 1);  in ovl_fill_super()
2033 	if (ofs->config.xino != OVL_XINO_OFF) {  in ovl_fill_super()
2034 		ofs->xino_mode = BITS_PER_LONG - 32;  in ovl_fill_super()
2035 		if (!ofs->xino_mode) {  in ovl_fill_super()
2037 			ofs->config.xino = OVL_XINO_OFF;  in ovl_fill_super()
2044 	if (ofs->config.upperdir) {  in ovl_fill_super()
2048 		if (!ofs->config.workdir) {  in ovl_fill_super()
2053 		err = ovl_get_upper(sb, ofs, &layers[0], &upperpath);  in ovl_fill_super()
2057 		upper_sb = ovl_upper_mnt(ofs)->mnt_sb;  in ovl_fill_super()
2058 		if (!ovl_should_sync(ofs)) {  in ovl_fill_super()
2059 			ofs->errseq = errseq_sample(&upper_sb->s_wb_err);  in ovl_fill_super()
2060 			if (errseq_check(&upper_sb->s_wb_err, ofs->errseq)) {  in ovl_fill_super()
2067 		err = ovl_get_workdir(sb, ofs, &upperpath);  in ovl_fill_super()
2071 		if (!ofs->workdir)  in ovl_fill_super()
2077 	oe = ovl_get_lowerstack(sb, splitlower, numlower, ofs, layers);  in ovl_fill_super()
2083 	if (!ovl_upper_mnt(ofs))  in ovl_fill_super()
2086 	if (!ofs->config.uuid && ofs->numfs > 1) {  in ovl_fill_super()
2088 		ofs->config.uuid = true;  in ovl_fill_super()
2091 	if (!ovl_force_readonly(ofs) && ofs->config.index) {  in ovl_fill_super()
2092 		err = ovl_get_indexdir(sb, ofs, oe, &upperpath);  in ovl_fill_super()
2097 		if (!ofs->indexdir)  in ovl_fill_super()
2101 	err = ovl_check_overlapping_layers(sb, ofs);  in ovl_fill_super()
2106 	if (!ofs->indexdir) {  in ovl_fill_super()
2107 		ofs->config.index = false;  in ovl_fill_super()
2108 		if (ovl_upper_mnt(ofs) && ofs->config.nfs_export) {  in ovl_fill_super()
2110 			ofs->config.nfs_export = false;  in ovl_fill_super()
2114 	if (ofs->config.metacopy && ofs->config.nfs_export) {  in ovl_fill_super()
2116 		ofs->config.nfs_export = false;  in ovl_fill_super()
2119 	if (ofs->config.nfs_export)  in ovl_fill_super()
2126 	sb->s_xattr = ofs->config.userxattr ? ovl_user_xattr_handlers :  in ovl_fill_super()
2128 	sb->s_fs_info = ofs;  in ovl_fill_super()
2150 	ovl_free_fs(ofs);  in ovl_fill_super()