1 // SPDX-License-Identifier: GPL-2.0-only
4 #include <linux/module.h>
5 #include <linux/namei.h>
6 #include <linux/fs_context.h>
7 #include <linux/fs_parser.h>
8 #include <linux/posix_acl_xattr.h>
9 #include <linux/seq_file.h>
10 #include <linux/xattr.h>
11 #include "overlayfs.h"
14 static bool ovl_redirect_dir_def = IS_ENABLED(CONFIG_OVERLAY_FS_REDIRECT_DIR);
15 module_param_named(redirect_dir, ovl_redirect_dir_def, bool, 0644);
16 MODULE_PARM_DESC(redirect_dir,
17 "Default to on or off for the redirect_dir feature");
19 static bool ovl_redirect_always_follow =
20 IS_ENABLED(CONFIG_OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW);
21 module_param_named(redirect_always_follow, ovl_redirect_always_follow,
23 MODULE_PARM_DESC(redirect_always_follow,
24 "Follow redirects even if redirect_dir feature is turned off");
26 static bool ovl_xino_auto_def = IS_ENABLED(CONFIG_OVERLAY_FS_XINO_AUTO);
27 module_param_named(xino_auto, ovl_xino_auto_def, bool, 0644);
28 MODULE_PARM_DESC(xino_auto,
29 "Auto enable xino feature");
31 static bool ovl_index_def = IS_ENABLED(CONFIG_OVERLAY_FS_INDEX);
32 module_param_named(index, ovl_index_def, bool, 0644);
33 MODULE_PARM_DESC(index,
34 "Default to on or off for the inodes index feature");
36 static bool ovl_nfs_export_def = IS_ENABLED(CONFIG_OVERLAY_FS_NFS_EXPORT);
37 module_param_named(nfs_export, ovl_nfs_export_def, bool, 0644);
38 MODULE_PARM_DESC(nfs_export,
39 "Default to on or off for the NFS export feature");
41 static bool ovl_metacopy_def = IS_ENABLED(CONFIG_OVERLAY_FS_METACOPY);
42 module_param_named(metacopy, ovl_metacopy_def, bool, 0644);
43 MODULE_PARM_DESC(metacopy,
44 "Default to on or off for the metadata only copy up feature");
50 Opt_default_permissions,
62 static const struct constant_table ovl_parameter_bool[] = {
68 static const struct constant_table ovl_parameter_uuid[] = {
69 { "off", OVL_UUID_OFF },
70 { "null", OVL_UUID_NULL },
71 { "auto", OVL_UUID_AUTO },
72 { "on", OVL_UUID_ON },
76 static const char *ovl_uuid_mode(struct ovl_config *config)
78 return ovl_parameter_uuid[config->uuid].name;
81 static int ovl_uuid_def(void)
86 static const struct constant_table ovl_parameter_xino[] = {
87 { "off", OVL_XINO_OFF },
88 { "auto", OVL_XINO_AUTO },
89 { "on", OVL_XINO_ON },
93 const char *ovl_xino_mode(struct ovl_config *config)
95 return ovl_parameter_xino[config->xino].name;
98 static int ovl_xino_def(void)
100 return ovl_xino_auto_def ? OVL_XINO_AUTO : OVL_XINO_OFF;
103 const struct constant_table ovl_parameter_redirect_dir[] = {
104 { "off", OVL_REDIRECT_OFF },
105 { "follow", OVL_REDIRECT_FOLLOW },
106 { "nofollow", OVL_REDIRECT_NOFOLLOW },
107 { "on", OVL_REDIRECT_ON },
111 static const char *ovl_redirect_mode(struct ovl_config *config)
113 return ovl_parameter_redirect_dir[config->redirect_mode].name;
116 static int ovl_redirect_mode_def(void)
118 return ovl_redirect_dir_def ? OVL_REDIRECT_ON :
119 ovl_redirect_always_follow ? OVL_REDIRECT_FOLLOW :
120 OVL_REDIRECT_NOFOLLOW;
123 static const struct constant_table ovl_parameter_verity[] = {
124 { "off", OVL_VERITY_OFF },
125 { "on", OVL_VERITY_ON },
126 { "require", OVL_VERITY_REQUIRE },
130 static const char *ovl_verity_mode(struct ovl_config *config)
132 return ovl_parameter_verity[config->verity_mode].name;
135 static int ovl_verity_mode_def(void)
137 return OVL_VERITY_OFF;
140 #define fsparam_string_empty(NAME, OPT) \
141 __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
143 const struct fs_parameter_spec ovl_parameter_spec[] = {
144 fsparam_string_empty("lowerdir", Opt_lowerdir),
145 fsparam_string("upperdir", Opt_upperdir),
146 fsparam_string("workdir", Opt_workdir),
147 fsparam_flag("default_permissions", Opt_default_permissions),
148 fsparam_enum("redirect_dir", Opt_redirect_dir, ovl_parameter_redirect_dir),
149 fsparam_enum("index", Opt_index, ovl_parameter_bool),
150 fsparam_enum("uuid", Opt_uuid, ovl_parameter_uuid),
151 fsparam_enum("nfs_export", Opt_nfs_export, ovl_parameter_bool),
152 fsparam_flag("userxattr", Opt_userxattr),
153 fsparam_enum("xino", Opt_xino, ovl_parameter_xino),
154 fsparam_enum("metacopy", Opt_metacopy, ovl_parameter_bool),
155 fsparam_enum("verity", Opt_verity, ovl_parameter_verity),
156 fsparam_flag("volatile", Opt_volatile),
160 static char *ovl_next_opt(char **s)
168 for (p = sbegin; *p; p++) {
173 } else if (*p == ',') {
183 static int ovl_parse_monolithic(struct fs_context *fc, void *data)
185 return vfs_parse_monolithic_sep(fc, data, ovl_next_opt);
188 static ssize_t ovl_parse_param_split_lowerdirs(char *str)
190 ssize_t nr_layers = 1, nr_colons = 0;
193 for (s = d = str;; s++, d++) {
195 /* keep esc chars in split lowerdir */
197 } else if (*s == ':') {
198 bool next_colon = (*(s + 1) == ':');
201 if (nr_colons == 2 && next_colon) {
202 pr_err("only single ':' or double '::' sequences of unescaped colons in lowerdir mount option allowed.\n");
205 /* count layers, not colons */
215 /* trailing colons */
217 pr_err("unescaped trailing colons in lowerdir mount option.\n");
228 static int ovl_mount_dir_noesc(const char *name, struct path *path)
233 pr_err("empty lowerdir\n");
236 err = kern_path(name, LOOKUP_FOLLOW, path);
238 pr_err("failed to resolve '%s': %i\n", name, err);
242 if (ovl_dentry_weird(path->dentry)) {
243 pr_err("filesystem on '%s' not supported\n", name);
246 if (!d_is_dir(path->dentry)) {
247 pr_err("'%s' not a directory\n", name);
258 static void ovl_unescape(char *s)
271 static int ovl_mount_dir(const char *name, struct path *path, bool upper)
274 char *tmp = kstrdup(name, GFP_KERNEL);
278 err = ovl_mount_dir_noesc(tmp, path);
280 if (!err && upper && path->dentry->d_flags & DCACHE_OP_REAL) {
281 pr_err("filesystem on '%s' not supported as upperdir\n",
291 static int ovl_parse_param_upperdir(const char *name, struct fs_context *fc,
295 struct ovl_fs *ofs = fc->s_fs_info;
296 struct ovl_config *config = &ofs->config;
297 struct ovl_fs_context *ctx = fc->fs_private;
301 err = ovl_mount_dir(name, &path, true);
306 * Check whether upper path is read-only here to report failures
307 * early. Don't forget to recheck when the superblock is created
308 * as the mount attributes could change.
310 if (__mnt_is_readonly(path.mnt)) {
315 dup = kstrdup(name, GFP_KERNEL);
322 kfree(config->workdir);
323 config->workdir = dup;
324 path_put(&ctx->work);
327 kfree(config->upperdir);
328 config->upperdir = dup;
329 path_put(&ctx->upper);
335 static void ovl_parse_param_drop_lowerdir(struct ovl_fs_context *ctx)
337 for (size_t nr = 0; nr < ctx->nr; nr++) {
338 path_put(&ctx->lower[nr].path);
339 kfree(ctx->lower[nr].name);
340 ctx->lower[nr].name = NULL;
347 * Parse lowerdir= mount option:
349 * (1) lowerdir=/lower1:/lower2:/lower3::/data1::/data2
350 * Set "/lower1", "/lower2", and "/lower3" as lower layers and
351 * "/data1" and "/data2" as data lower layers. Any existing lower
352 * layers are replaced.
354 static int ovl_parse_param_lowerdir(const char *name, struct fs_context *fc)
357 struct ovl_fs_context *ctx = fc->fs_private;
358 struct ovl_fs_context_layer *l;
359 char *dup = NULL, *dup_iter;
360 ssize_t nr_lower = 0, nr = 0, nr_data = 0;
361 bool append = false, data_layer = false;
364 * Ensure we're backwards compatible with mount(2)
365 * by allowing relative paths.
368 /* drop all existing lower layers */
370 ovl_parse_param_drop_lowerdir(ctx);
375 pr_err("cannot append lower layer");
379 dup = kstrdup(name, GFP_KERNEL);
384 nr_lower = ovl_parse_param_split_lowerdirs(dup);
388 if ((nr_lower > OVL_MAX_STACK) ||
389 (append && (size_add(ctx->nr, nr_lower) > OVL_MAX_STACK))) {
390 pr_err("too many lower directories, limit is %d\n", OVL_MAX_STACK);
395 ovl_parse_param_drop_lowerdir(ctx);
400 * We want nr <= nr_lower <= capacity We know nr > 0 and nr <=
401 * capacity. If nr == 0 this wouldn't be append. If nr +
402 * nr_lower is <= capacity then nr <= nr_lower <= capacity
403 * already holds. If nr + nr_lower exceeds capacity, we realloc.
407 * Ensure we're backwards compatible with mount(2) which allows
408 * "lowerdir=/a:/b:/c,lowerdir=/d:/e:/f" causing the last
409 * specified lowerdir mount option to win.
411 * We want nr <= nr_lower <= capacity We know either (i) nr == 0
412 * or (ii) nr > 0. We also know nr_lower > 0. The capacity
413 * could've been changed multiple times already so we only know
414 * nr <= capacity. If nr + nr_lower > capacity we realloc,
415 * otherwise nr <= nr_lower <= capacity holds already.
418 if (nr_lower > ctx->capacity) {
420 l = krealloc_array(ctx->lower, nr_lower, sizeof(*ctx->lower),
426 ctx->capacity = nr_lower;
430 * (3) By (1) and (2) we know nr <= nr_lower <= capacity.
431 * (4) If ctx->nr == 0 => replace
432 * We have verified above that the lowerdir mount option
433 * isn't an append, i.e., the lowerdir mount option
434 * doesn't start with ":" or "::".
435 * (4.1) The lowerdir mount options only contains regular lower
437 * => Nothing to verify.
438 * (4.2) The lowerdir mount options contains regular ":" and
440 * => We need to verify that data lower layers "::" aren't
441 * followed by regular ":" lower layers
442 * (5) If ctx->nr > 0 => append
443 * We know that there's at least one regular layer
444 * otherwise we would've failed when parsing the previous
445 * lowerdir mount option.
446 * (5.1) The lowerdir mount option is a regular layer ":" append
447 * => We need to verify that no data layers have been
449 * (5.2) The lowerdir mount option is a data layer "::" append
450 * We know that there's at least one regular layer or
451 * other data layers. => There's nothing to verify.
454 for (nr = ctx->nr; nr < nr_lower; nr++) {
456 memset(l, 0, sizeof(*l));
458 err = ovl_mount_dir(dup_iter, &l->path, false);
463 l->name = kstrdup(dup_iter, GFP_KERNEL_ACCOUNT);
470 /* Calling strchr() again would overrun. */
471 if ((nr + 1) == nr_lower)
475 dup_iter = strchr(dup_iter, '\0') + 1;
478 * This is a regular layer so we require that
479 * there are no data layers.
481 if ((ctx->nr_data + nr_data) > 0) {
482 pr_err("regular lower layers cannot follow data lower layers");
490 /* This is a data lower layer. */
495 ctx->nr_data += nr_data;
501 * We know nr >= ctx->nr < nr_lower. If we failed somewhere
502 * we want to undo until nr == ctx->nr. This is correct for
503 * both ctx->nr == 0 and ctx->nr > 0.
505 for (; nr >= ctx->nr; nr--) {
519 /* Intentionally don't realloc to a smaller size. */
523 static int ovl_parse_param(struct fs_context *fc, struct fs_parameter *param)
526 struct fs_parse_result result;
527 struct ovl_fs *ofs = fc->s_fs_info;
528 struct ovl_config *config = &ofs->config;
529 struct ovl_fs_context *ctx = fc->fs_private;
532 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
534 * On remount overlayfs has always ignored all mount
535 * options no matter if malformed or not so for
536 * backwards compatibility we do the same here.
542 * Give us the freedom to allow changing mount options
543 * with the new mount api in the future. So instead of
544 * silently ignoring everything we report a proper
545 * error. This is only visible for users of the new
548 return invalfc(fc, "No changes allowed in reconfigure");
551 opt = fs_parse(fc, ovl_parameter_spec, param, &result);
557 err = ovl_parse_param_lowerdir(param->string, fc);
562 err = ovl_parse_param_upperdir(param->string, fc,
563 (Opt_workdir == opt));
565 case Opt_default_permissions:
566 config->default_permissions = true;
568 case Opt_redirect_dir:
569 config->redirect_mode = result.uint_32;
570 if (config->redirect_mode == OVL_REDIRECT_OFF) {
571 config->redirect_mode = ovl_redirect_always_follow ?
572 OVL_REDIRECT_FOLLOW :
573 OVL_REDIRECT_NOFOLLOW;
575 ctx->set.redirect = true;
578 config->index = result.uint_32;
579 ctx->set.index = true;
582 config->uuid = result.uint_32;
585 config->nfs_export = result.uint_32;
586 ctx->set.nfs_export = true;
589 config->xino = result.uint_32;
592 config->metacopy = result.uint_32;
593 ctx->set.metacopy = true;
596 config->verity_mode = result.uint_32;
599 config->ovl_volatile = true;
602 config->userxattr = true;
605 pr_err("unrecognized mount option \"%s\" or missing value\n",
613 static int ovl_get_tree(struct fs_context *fc)
615 return get_tree_nodev(fc, ovl_fill_super);
618 static inline void ovl_fs_context_free(struct ovl_fs_context *ctx)
620 ovl_parse_param_drop_lowerdir(ctx);
621 path_put(&ctx->upper);
622 path_put(&ctx->work);
627 static void ovl_free(struct fs_context *fc)
629 struct ovl_fs *ofs = fc->s_fs_info;
630 struct ovl_fs_context *ctx = fc->fs_private;
633 * ofs is stored in the fs_context when it is initialized.
634 * ofs is transferred to the superblock on a successful mount,
635 * but if an error occurs before the transfer we have to free
642 ovl_fs_context_free(ctx);
645 static int ovl_reconfigure(struct fs_context *fc)
647 struct super_block *sb = fc->root->d_sb;
648 struct ovl_fs *ofs = OVL_FS(sb);
649 struct super_block *upper_sb;
652 if (!(fc->sb_flags & SB_RDONLY) && ovl_force_readonly(ofs))
655 if (fc->sb_flags & SB_RDONLY && !sb_rdonly(sb)) {
656 upper_sb = ovl_upper_mnt(ofs)->mnt_sb;
657 if (ovl_should_sync(ofs)) {
658 down_read(&upper_sb->s_umount);
659 ret = sync_filesystem(upper_sb);
660 up_read(&upper_sb->s_umount);
667 static const struct fs_context_operations ovl_context_ops = {
668 .parse_monolithic = ovl_parse_monolithic,
669 .parse_param = ovl_parse_param,
670 .get_tree = ovl_get_tree,
671 .reconfigure = ovl_reconfigure,
676 * This is called during fsopen() and will record the user namespace of
677 * the caller in fc->user_ns since we've raised FS_USERNS_MOUNT. We'll
678 * need it when we actually create the superblock to verify that the
679 * process creating the superblock is in the same user namespace as
680 * process that called fsopen().
682 int ovl_init_fs_context(struct fs_context *fc)
684 struct ovl_fs_context *ctx;
687 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
692 * By default we allocate for three lower layers. It's likely
693 * that it'll cover most users.
695 ctx->lower = kmalloc_array(3, sizeof(*ctx->lower), GFP_KERNEL_ACCOUNT);
700 ofs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);
704 ofs->config.redirect_mode = ovl_redirect_mode_def();
705 ofs->config.index = ovl_index_def;
706 ofs->config.uuid = ovl_uuid_def();
707 ofs->config.nfs_export = ovl_nfs_export_def;
708 ofs->config.xino = ovl_xino_def();
709 ofs->config.metacopy = ovl_metacopy_def;
712 fc->fs_private = ctx;
713 fc->ops = &ovl_context_ops;
717 ovl_fs_context_free(ctx);
722 void ovl_free_fs(struct ovl_fs *ofs)
724 struct vfsmount **mounts;
727 iput(ofs->workbasedir_trap);
728 iput(ofs->indexdir_trap);
729 iput(ofs->workdir_trap);
733 if (ofs->workdir_locked)
734 ovl_inuse_unlock(ofs->workbasedir);
735 dput(ofs->workbasedir);
736 if (ofs->upperdir_locked)
737 ovl_inuse_unlock(ovl_upper_mnt(ofs)->mnt_root);
739 /* Reuse ofs->config.lowerdirs as a vfsmount array before freeing it */
740 mounts = (struct vfsmount **) ofs->config.lowerdirs;
741 for (i = 0; i < ofs->numlayer; i++) {
742 iput(ofs->layers[i].trap);
743 kfree(ofs->config.lowerdirs[i]);
744 mounts[i] = ofs->layers[i].mnt;
746 kern_unmount_array(mounts, ofs->numlayer);
748 for (i = 0; i < ofs->numfs; i++)
749 free_anon_bdev(ofs->fs[i].pseudo_dev);
752 kfree(ofs->config.lowerdirs);
753 kfree(ofs->config.upperdir);
754 kfree(ofs->config.workdir);
755 if (ofs->creator_cred)
756 put_cred(ofs->creator_cred);
760 int ovl_fs_params_verify(const struct ovl_fs_context *ctx,
761 struct ovl_config *config)
763 struct ovl_opt_set set = ctx->set;
765 if (ctx->nr_data > 0 && !config->metacopy) {
766 pr_err("lower data-only dirs require metacopy support.\n");
770 /* Workdir/index are useless in non-upper mount */
771 if (!config->upperdir) {
772 if (config->workdir) {
773 pr_info("option \"workdir=%s\" is useless in a non-upper mount, ignore\n",
775 kfree(config->workdir);
776 config->workdir = NULL;
778 if (config->index && set.index) {
779 pr_info("option \"index=on\" is useless in a non-upper mount, ignore\n");
782 config->index = false;
785 if (!config->upperdir && config->ovl_volatile) {
786 pr_info("option \"volatile\" is meaningless in a non-upper mount, ignoring it.\n");
787 config->ovl_volatile = false;
790 if (!config->upperdir && config->uuid == OVL_UUID_ON) {
791 pr_info("option \"uuid=on\" requires an upper fs, falling back to uuid=null.\n");
792 config->uuid = OVL_UUID_NULL;
795 /* Resolve verity -> metacopy dependency */
796 if (config->verity_mode && !config->metacopy) {
797 /* Don't allow explicit specified conflicting combinations */
799 pr_err("conflicting options: metacopy=off,verity=%s\n",
800 ovl_verity_mode(config));
803 /* Otherwise automatically enable metacopy. */
804 config->metacopy = true;
808 * This is to make the logic below simpler. It doesn't make any other
809 * difference, since redirect_dir=on is only used for upper.
811 if (!config->upperdir && config->redirect_mode == OVL_REDIRECT_FOLLOW)
812 config->redirect_mode = OVL_REDIRECT_ON;
814 /* Resolve verity -> metacopy -> redirect_dir dependency */
815 if (config->metacopy && config->redirect_mode != OVL_REDIRECT_ON) {
816 if (set.metacopy && set.redirect) {
817 pr_err("conflicting options: metacopy=on,redirect_dir=%s\n",
818 ovl_redirect_mode(config));
821 if (config->verity_mode && set.redirect) {
822 pr_err("conflicting options: verity=%s,redirect_dir=%s\n",
823 ovl_verity_mode(config), ovl_redirect_mode(config));
828 * There was an explicit redirect_dir=... that resulted
831 pr_info("disabling metacopy due to redirect_dir=%s\n",
832 ovl_redirect_mode(config));
833 config->metacopy = false;
835 /* Automatically enable redirect otherwise. */
836 config->redirect_mode = OVL_REDIRECT_ON;
840 /* Resolve nfs_export -> index dependency */
841 if (config->nfs_export && !config->index) {
842 if (!config->upperdir &&
843 config->redirect_mode != OVL_REDIRECT_NOFOLLOW) {
844 pr_info("NFS export requires \"redirect_dir=nofollow\" on non-upper mount, falling back to nfs_export=off.\n");
845 config->nfs_export = false;
846 } else if (set.nfs_export && set.index) {
847 pr_err("conflicting options: nfs_export=on,index=off\n");
849 } else if (set.index) {
851 * There was an explicit index=off that resulted
854 pr_info("disabling nfs_export due to index=off\n");
855 config->nfs_export = false;
857 /* Automatically enable index otherwise. */
858 config->index = true;
862 /* Resolve nfs_export -> !metacopy && !verity dependency */
863 if (config->nfs_export && config->metacopy) {
864 if (set.nfs_export && set.metacopy) {
865 pr_err("conflicting options: nfs_export=on,metacopy=on\n");
870 * There was an explicit metacopy=on that resulted
873 pr_info("disabling nfs_export due to metacopy=on\n");
874 config->nfs_export = false;
875 } else if (config->verity_mode) {
877 * There was an explicit verity=.. that resulted
880 pr_info("disabling nfs_export due to verity=%s\n",
881 ovl_verity_mode(config));
882 config->nfs_export = false;
885 * There was an explicit nfs_export=on that resulted
888 pr_info("disabling metacopy due to nfs_export=on\n");
889 config->metacopy = false;
894 /* Resolve userxattr -> !redirect && !metacopy && !verity dependency */
895 if (config->userxattr) {
897 config->redirect_mode != OVL_REDIRECT_NOFOLLOW) {
898 pr_err("conflicting options: userxattr,redirect_dir=%s\n",
899 ovl_redirect_mode(config));
902 if (config->metacopy && set.metacopy) {
903 pr_err("conflicting options: userxattr,metacopy=on\n");
906 if (config->verity_mode) {
907 pr_err("conflicting options: userxattr,verity=%s\n",
908 ovl_verity_mode(config));
912 * Silently disable default setting of redirect and metacopy.
913 * This shall be the default in the future as well: these
914 * options must be explicitly enabled if used together with
917 config->redirect_mode = OVL_REDIRECT_NOFOLLOW;
918 config->metacopy = false;
926 * @m: the seq_file handle
927 * @dentry: The dentry to query
929 * Prints the mount options for a given superblock.
930 * Returns zero; does not fail.
932 int ovl_show_options(struct seq_file *m, struct dentry *dentry)
934 struct super_block *sb = dentry->d_sb;
935 struct ovl_fs *ofs = OVL_FS(sb);
936 size_t nr, nr_merged_lower = ofs->numlayer - ofs->numdatalayer;
939 * lowerdirs[] starts from offset 1, then
940 * >= 0 regular lower layers prefixed with : and
941 * >= 0 data-only lower layers prefixed with ::
943 * we need to escase comma and space like seq_show_option() does and
944 * we also need to escape the colon separator from lowerdir paths.
946 seq_puts(m, ",lowerdir=");
947 for (nr = 1; nr < ofs->numlayer; nr++) {
950 if (nr >= nr_merged_lower)
952 seq_escape(m, ofs->config.lowerdirs[nr], ":, \t\n\\");
954 if (ofs->config.upperdir) {
955 seq_show_option(m, "upperdir", ofs->config.upperdir);
956 seq_show_option(m, "workdir", ofs->config.workdir);
958 if (ofs->config.default_permissions)
959 seq_puts(m, ",default_permissions");
960 if (ofs->config.redirect_mode != ovl_redirect_mode_def())
961 seq_printf(m, ",redirect_dir=%s",
962 ovl_redirect_mode(&ofs->config));
963 if (ofs->config.index != ovl_index_def)
964 seq_printf(m, ",index=%s", ofs->config.index ? "on" : "off");
965 if (ofs->config.uuid != ovl_uuid_def())
966 seq_printf(m, ",uuid=%s", ovl_uuid_mode(&ofs->config));
967 if (ofs->config.nfs_export != ovl_nfs_export_def)
968 seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ?
970 if (ofs->config.xino != ovl_xino_def() && !ovl_same_fs(ofs))
971 seq_printf(m, ",xino=%s", ovl_xino_mode(&ofs->config));
972 if (ofs->config.metacopy != ovl_metacopy_def)
973 seq_printf(m, ",metacopy=%s",
974 ofs->config.metacopy ? "on" : "off");
975 if (ofs->config.ovl_volatile)
976 seq_puts(m, ",volatile");
977 if (ofs->config.userxattr)
978 seq_puts(m, ",userxattr");
979 if (ofs->config.verity_mode != ovl_verity_mode_def())
980 seq_printf(m, ",verity=%s",
981 ovl_verity_mode(&ofs->config));