Lines Matching +full:lower +full:- +full:case
1 // SPDX-License-Identifier: GPL-2.0-only
60 for (i = 0; i < oe->numlower; i++) in ovl_entry_stack_free()
61 dput(oe->lowerstack[i].dentry); in ovl_entry_stack_free()
71 struct ovl_entry *oe = dentry->d_fsdata; in ovl_dentry_release()
82 struct dentry *real = NULL, *lower; in ovl_d_real() local
101 lower = ovl_dentry_lowerdata(dentry); in ovl_d_real()
102 if (!lower) in ovl_d_real()
104 real = lower; in ovl_d_real()
113 __func__, dentry, inode ? inode->i_sb->s_id : "NULL", in ovl_d_real()
114 inode ? inode->i_ino : 0, real, in ovl_d_real()
115 real && d_inode(real) ? d_inode(real)->i_ino : 0); in ovl_d_real()
124 if (d->d_flags & DCACHE_OP_WEAK_REVALIDATE) in ovl_revalidate_real()
125 ret = d->d_op->d_weak_revalidate(d, flags); in ovl_revalidate_real()
126 } else if (d->d_flags & DCACHE_OP_REVALIDATE) { in ovl_revalidate_real()
127 ret = d->d_op->d_revalidate(d, flags); in ovl_revalidate_real()
131 ret = -ESTALE; in ovl_revalidate_real()
140 struct ovl_entry *oe = dentry->d_fsdata; in ovl_dentry_revalidate_common()
149 for (i = 0; ret > 0 && i < oe->numlower; i++) { in ovl_dentry_revalidate_common()
150 ret = ovl_revalidate_real(oe->lowerstack[i].dentry, flags, in ovl_dentry_revalidate_common()
182 oi->cache = NULL; in ovl_alloc_inode()
183 oi->redirect = NULL; in ovl_alloc_inode()
184 oi->version = 0; in ovl_alloc_inode()
185 oi->flags = 0; in ovl_alloc_inode()
186 oi->__upperdentry = NULL; in ovl_alloc_inode()
187 oi->lower = NULL; in ovl_alloc_inode()
188 oi->lowerdata = NULL; in ovl_alloc_inode()
189 mutex_init(&oi->lock); in ovl_alloc_inode()
191 return &oi->vfs_inode; in ovl_alloc_inode()
198 kfree(oi->redirect); in ovl_free_inode()
199 mutex_destroy(&oi->lock); in ovl_free_inode()
207 dput(oi->__upperdentry); in ovl_destroy_inode()
208 iput(oi->lower); in ovl_destroy_inode()
209 if (S_ISDIR(inode->i_mode)) in ovl_destroy_inode()
212 iput(oi->lowerdata); in ovl_destroy_inode()
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()
232 /* Hack! Reuse ofs->layers as a vfsmount array before freeing it */ 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()
255 struct ovl_fs *ofs = sb->s_fs_info; in ovl_put_super()
263 struct ovl_fs *ofs = sb->s_fs_info; in ovl_sync_fs()
274 errseq_set(&sb->s_wb_err, -EIO); in ovl_sync_fs()
275 return -EIO; in ovl_sync_fs()
292 upper_sb = ovl_upper_mnt(ofs)->mnt_sb; in ovl_sync_fs()
294 down_read(&upper_sb->s_umount); in ovl_sync_fs()
296 up_read(&upper_sb->s_umount); in ovl_sync_fs()
311 struct ovl_fs *ofs = dentry->d_sb->s_fs_info; in ovl_statfs()
312 struct dentry *root_dentry = dentry->d_sb->s_root; in ovl_statfs()
320 buf->f_namelen = ofs->namelen; in ovl_statfs()
321 buf->f_type = OVERLAYFS_SUPER_MAGIC; in ovl_statfs()
330 return (!ovl_upper_mnt(ofs) || !ofs->workdir); in ovl_force_readonly()
357 struct super_block *sb = dentry->d_sb; in ovl_show_options()
358 struct ovl_fs *ofs = sb->s_fs_info; in ovl_show_options()
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.nfs_export != ovl_nfs_export_def) in ovl_show_options()
372 seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ? in ovl_show_options()
374 if (ofs->config.xino != ovl_xino_def() && !ovl_same_fs(sb)) in ovl_show_options()
375 seq_printf(m, ",xino=%s", ovl_xino_str[ofs->config.xino]); in ovl_show_options()
376 if (ofs->config.metacopy != ovl_metacopy_def) in ovl_show_options()
378 ofs->config.metacopy ? "on" : "off"); in ovl_show_options()
379 if (ofs->config.ovl_volatile) in ovl_show_options()
386 struct ovl_fs *ofs = sb->s_fs_info; in ovl_remount()
391 return -EROFS; in ovl_remount()
394 upper_sb = ovl_upper_mnt(ofs)->mnt_sb; in ovl_remount()
396 down_read(&upper_sb->s_umount); in ovl_remount()
398 up_read(&upper_sb->s_umount); in ovl_remount()
481 config->redirect_dir = true; in ovl_parse_redirect_mode()
486 config->redirect_follow = true; in ovl_parse_redirect_mode()
488 config->redirect_follow = true; in ovl_parse_redirect_mode()
491 config->redirect_follow = true; in ovl_parse_redirect_mode()
495 return -EINVAL; in ovl_parse_redirect_mode()
508 config->redirect_mode = kstrdup(ovl_redirect_mode_def(), GFP_KERNEL); in ovl_parse_opt()
509 if (!config->redirect_mode) in ovl_parse_opt()
510 return -ENOMEM; in ovl_parse_opt()
521 case OPT_UPPERDIR: in ovl_parse_opt()
522 kfree(config->upperdir); in ovl_parse_opt()
523 config->upperdir = match_strdup(&args[0]); in ovl_parse_opt()
524 if (!config->upperdir) in ovl_parse_opt()
525 return -ENOMEM; in ovl_parse_opt()
528 case OPT_LOWERDIR: in ovl_parse_opt()
529 kfree(config->lowerdir); in ovl_parse_opt()
530 config->lowerdir = match_strdup(&args[0]); in ovl_parse_opt()
531 if (!config->lowerdir) in ovl_parse_opt()
532 return -ENOMEM; in ovl_parse_opt()
535 case OPT_WORKDIR: in ovl_parse_opt()
536 kfree(config->workdir); in ovl_parse_opt()
537 config->workdir = match_strdup(&args[0]); in ovl_parse_opt()
538 if (!config->workdir) in ovl_parse_opt()
539 return -ENOMEM; in ovl_parse_opt()
542 case OPT_DEFAULT_PERMISSIONS: in ovl_parse_opt()
543 config->default_permissions = true; in ovl_parse_opt()
546 case OPT_REDIRECT_DIR: in ovl_parse_opt()
547 kfree(config->redirect_mode); in ovl_parse_opt()
548 config->redirect_mode = match_strdup(&args[0]); in ovl_parse_opt()
549 if (!config->redirect_mode) in ovl_parse_opt()
550 return -ENOMEM; in ovl_parse_opt()
554 case OPT_INDEX_ON: in ovl_parse_opt()
555 config->index = true; in ovl_parse_opt()
559 case OPT_INDEX_OFF: in ovl_parse_opt()
560 config->index = false; in ovl_parse_opt()
564 case OPT_NFS_EXPORT_ON: in ovl_parse_opt()
565 config->nfs_export = true; in ovl_parse_opt()
569 case OPT_NFS_EXPORT_OFF: in ovl_parse_opt()
570 config->nfs_export = false; in ovl_parse_opt()
574 case OPT_XINO_ON: in ovl_parse_opt()
575 config->xino = OVL_XINO_ON; in ovl_parse_opt()
578 case OPT_XINO_OFF: in ovl_parse_opt()
579 config->xino = OVL_XINO_OFF; in ovl_parse_opt()
582 case OPT_XINO_AUTO: in ovl_parse_opt()
583 config->xino = OVL_XINO_AUTO; in ovl_parse_opt()
586 case OPT_METACOPY_ON: in ovl_parse_opt()
587 config->metacopy = true; in ovl_parse_opt()
591 case OPT_METACOPY_OFF: in ovl_parse_opt()
592 config->metacopy = false; in ovl_parse_opt()
596 case OPT_VOLATILE: in ovl_parse_opt()
597 config->ovl_volatile = true; in ovl_parse_opt()
603 return -EINVAL; in ovl_parse_opt()
607 /* Workdir/index are useless in non-upper mount */ in ovl_parse_opt()
608 if (!config->upperdir) { in ovl_parse_opt()
609 if (config->workdir) { in ovl_parse_opt()
610 pr_info("option \"workdir=%s\" is useless in a non-upper mount, ignore\n", in ovl_parse_opt()
611 config->workdir); in ovl_parse_opt()
612 kfree(config->workdir); in ovl_parse_opt()
613 config->workdir = NULL; in ovl_parse_opt()
615 if (config->index && index_opt) { in ovl_parse_opt()
616 pr_info("option \"index=on\" is useless in a non-upper mount, ignore\n"); in ovl_parse_opt()
619 config->index = false; in ovl_parse_opt()
622 if (!config->upperdir && config->ovl_volatile) { in ovl_parse_opt()
623 pr_info("option \"volatile\" is meaningless in a non-upper mount, ignoring it.\n"); in ovl_parse_opt()
624 config->ovl_volatile = false; in ovl_parse_opt()
627 err = ovl_parse_redirect_mode(config, config->redirect_mode); in ovl_parse_opt()
633 * difference, since config->redirect_dir is only used for upper. in ovl_parse_opt()
635 if (!config->upperdir && config->redirect_follow) in ovl_parse_opt()
636 config->redirect_dir = true; in ovl_parse_opt()
638 /* Resolve metacopy -> redirect_dir dependency */ in ovl_parse_opt()
639 if (config->metacopy && !config->redirect_dir) { in ovl_parse_opt()
642 config->redirect_mode); in ovl_parse_opt()
643 return -EINVAL; in ovl_parse_opt()
651 config->redirect_mode); in ovl_parse_opt()
652 config->metacopy = false; in ovl_parse_opt()
655 config->redirect_follow = config->redirect_dir = true; in ovl_parse_opt()
659 /* Resolve nfs_export -> index dependency */ in ovl_parse_opt()
660 if (config->nfs_export && !config->index) { in ovl_parse_opt()
661 if (!config->upperdir && config->redirect_follow) { in ovl_parse_opt()
662 …pr_info("NFS export requires \"redirect_dir=nofollow\" on non-upper mount, falling back to nfs_exp… in ovl_parse_opt()
663 config->nfs_export = false; in ovl_parse_opt()
666 return -EINVAL; in ovl_parse_opt()
673 config->nfs_export = false; in ovl_parse_opt()
676 config->index = true; in ovl_parse_opt()
680 /* Resolve nfs_export -> !metacopy dependency */ in ovl_parse_opt()
681 if (config->nfs_export && config->metacopy) { in ovl_parse_opt()
684 return -EINVAL; in ovl_parse_opt()
692 config->nfs_export = false; in ovl_parse_opt()
699 config->metacopy = false; in ovl_parse_opt()
712 struct inode *dir = ofs->workbasedir->d_inode; in ovl_workdir_create()
720 work = lookup_one_len(name, ofs->workbasedir, strlen(name)); in ovl_workdir_create()
728 if (work->d_inode) { in ovl_workdir_create()
729 err = -EEXIST; in ovl_workdir_create()
739 if (err == -EINVAL) { in ovl_workdir_create()
751 err = -EINVAL; in ovl_workdir_create()
759 * b) -ENODATA (there was no POSIX ACL xattr) in ovl_workdir_create()
760 * c) -EOPNOTSUPP (POSIX ACL xattrs are not supported) in ovl_workdir_create()
763 * mean that the xattr doesn't exist (e.g. -ERANGE is returned in ovl_workdir_create()
769 if (err && err != -ENODATA && err != -EOPNOTSUPP) in ovl_workdir_create()
773 if (err && err != -ENODATA && err != -EOPNOTSUPP) in ovl_workdir_create()
777 inode_lock(work->d_inode); in ovl_workdir_create()
779 inode_unlock(work->d_inode); in ovl_workdir_create()
793 pr_warn("failed to create directory %s/%s (errno: %i); mounting read-only\n", in ovl_workdir_create()
794 ofs->config.workdir, name, -err); in ovl_workdir_create()
814 int err = -EINVAL; in ovl_mount_dir_noesc()
825 err = -EINVAL; in ovl_mount_dir_noesc()
826 if (ovl_dentry_weird(path->dentry)) { in ovl_mount_dir_noesc()
830 if (!d_is_dir(path->dentry)) { in ovl_mount_dir_noesc()
844 int err = -ENOMEM; in ovl_mount_dir()
851 if (!err && path->dentry->d_flags & DCACHE_OP_REAL) { in ovl_mount_dir()
855 err = -EINVAL; in ovl_mount_dir()
871 ofs->namelen = max(ofs->namelen, statfs.f_namelen); in ovl_check_namelen()
890 *stack_depth = max(*stack_depth, path->mnt->mnt_sb->s_stack_depth); in ovl_lower_dir()
896 fh_type = ovl_can_decode_fh(path->dentry->d_sb); in ovl_lower_dir()
897 if ((ofs->config.nfs_export || in ovl_lower_dir()
898 (ofs->config.index && ofs->config.upperdir)) && !fh_type) { in ovl_lower_dir()
899 ofs->config.index = false; in ovl_lower_dir()
900 ofs->config.nfs_export = false; in ovl_lower_dir()
905 /* Check if lower fs has 32bit inode numbers */ in ovl_lower_dir()
907 ofs->xino_mode = -1; in ovl_lower_dir()
949 return ovl_xattr_get(dentry, inode, handler->name, buffer, size); in ovl_posix_acl_xattr_get()
963 /* Check that everything is OK before copy-up */ in ovl_posix_acl_xattr_set()
969 err = -EOPNOTSUPP; in ovl_posix_acl_xattr_set()
972 if (!realinode->i_op->set_acl) in ovl_posix_acl_xattr_set()
974 if (handler->flags == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) { in ovl_posix_acl_xattr_set()
975 err = acl ? -EACCES : 0; in ovl_posix_acl_xattr_set()
978 err = -EPERM; in ovl_posix_acl_xattr_set()
988 if (unlikely(inode->i_mode & S_ISGID) && in ovl_posix_acl_xattr_set()
989 handler->flags == ACL_TYPE_ACCESS && in ovl_posix_acl_xattr_set()
990 !in_group_p(inode->i_gid) && in ovl_posix_acl_xattr_set()
999 err = ovl_xattr_set(dentry, inode, handler->name, value, size, flags); in ovl_posix_acl_xattr_set()
1014 return -EOPNOTSUPP; in ovl_own_xattr_get()
1022 return -EOPNOTSUPP; in ovl_own_xattr_set()
1087 if (err == -ELOOP) in ovl_setup_trap()
1100 * attempted to be used as a lower layer in a new overlay mount.
1104 if (ofs->config.index) { in ovl_report_in_use()
1105 …pr_err("%s is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override e… in ovl_report_in_use()
1107 return -EBUSY; in ovl_report_in_use()
1109 …pr_warn("%s is in-use as upperdir/workdir of another mount, accessing files from both mounts will … in ovl_report_in_use()
1121 err = ovl_mount_dir(ofs->config.upperdir, upperpath); in ovl_get_upper()
1126 if (sb_rdonly(upperpath->mnt->mnt_sb)) { in ovl_get_upper()
1127 pr_err("upper fs is r/o, try multi-lower layers mount\n"); in ovl_get_upper()
1128 err = -EINVAL; in ovl_get_upper()
1132 err = ovl_check_namelen(upperpath, ofs, ofs->config.upperdir); in ovl_get_upper()
1136 err = ovl_setup_trap(sb, upperpath->dentry, &upper_layer->trap, in ovl_get_upper()
1149 upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME); in ovl_get_upper()
1150 upper_layer->mnt = upper_mnt; in ovl_get_upper()
1151 upper_layer->idx = 0; in ovl_get_upper()
1152 upper_layer->fsid = 0; in ovl_get_upper()
1159 * okay because we don't yet have guarantees in that case, but it will in ovl_get_upper()
1163 if (upper_mnt->mnt_sb->s_flags & SB_NOSEC) in ovl_get_upper()
1164 sb->s_flags |= SB_NOSEC; in ovl_get_upper()
1166 if (ovl_inuse_trylock(ovl_upper_mnt(ofs)->mnt_root)) { in ovl_get_upper()
1167 ofs->upperdir_locked = true; in ovl_get_upper()
1206 /* Name is inline and stable - using snapshot as a copy helper */ in ovl_check_rename_whiteout()
1210 if (err == -EINVAL) in ovl_check_rename_whiteout()
1245 inode_lock_nested(parent->d_inode, I_MUTEX_PARENT); in ovl_lookup_or_create()
1247 if (!IS_ERR(child) && !child->d_inode) in ovl_lookup_or_create()
1248 child = ovl_create_real(parent->d_inode, child, in ovl_lookup_or_create()
1250 inode_unlock(parent->d_inode); in ovl_lookup_or_create()
1263 struct dentry *d = dget(ofs->workbasedir); in ovl_create_volatile_dirty()
1269 for (ctr = ARRAY_SIZE(volatile_path); ctr; ctr--, name++) { in ovl_create_volatile_dirty()
1297 ofs->workdir = workdir; in ovl_make_workdir()
1299 err = ovl_setup_trap(sb, ofs->workdir, &ofs->workdir_trap, "workdir"); in ovl_make_workdir()
1318 temp = ovl_do_tmpfile(ofs->workdir, S_IFREG | 0); in ovl_make_workdir()
1319 ofs->tmpfile = !IS_ERR(temp); in ovl_make_workdir()
1320 if (ofs->tmpfile) in ovl_make_workdir()
1327 err = ovl_check_rename_whiteout(ofs->workdir); in ovl_make_workdir()
1338 err = ovl_do_setxattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE, "0", 1); in ovl_make_workdir()
1340 ofs->noxattr = true; in ovl_make_workdir()
1341 ofs->config.index = false; in ovl_make_workdir()
1342 ofs->config.metacopy = false; in ovl_make_workdir()
1346 ovl_do_removexattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE); in ovl_make_workdir()
1350 * We allowed sub-optimal upper fs configuration and don't want to break in ovl_make_workdir()
1354 if (ovl_dentry_remote(ofs->workdir) && in ovl_make_workdir()
1355 (!d_type || !rename_whiteout || ofs->noxattr)) { in ovl_make_workdir()
1357 err = -EINVAL; in ovl_make_workdir()
1365 if (ofs->config.ovl_volatile) { in ovl_make_workdir()
1374 fh_type = ovl_can_decode_fh(ofs->workdir->d_sb); in ovl_make_workdir()
1375 if (ofs->config.index && !fh_type) { in ovl_make_workdir()
1376 ofs->config.index = false; in ovl_make_workdir()
1382 ofs->xino_mode = -1; in ovl_make_workdir()
1385 if (ofs->config.nfs_export && !ofs->config.index) { in ovl_make_workdir()
1387 ofs->config.nfs_export = false; in ovl_make_workdir()
1400 err = ovl_mount_dir(ofs->config.workdir, &workpath); in ovl_get_workdir()
1404 err = -EINVAL; in ovl_get_workdir()
1405 if (upperpath->mnt != workpath.mnt) { in ovl_get_workdir()
1409 if (!ovl_workdir_ok(workpath.dentry, upperpath->dentry)) { in ovl_get_workdir()
1414 ofs->workbasedir = dget(workpath.dentry); in ovl_get_workdir()
1416 if (ovl_inuse_trylock(ofs->workbasedir)) { in ovl_get_workdir()
1417 ofs->workdir_locked = true; in ovl_get_workdir()
1424 err = ovl_setup_trap(sb, ofs->workbasedir, &ofs->workbasedir_trap, in ovl_get_workdir()
1448 /* Verify lower root is upper root origin */ in ovl_get_indexdir()
1449 err = ovl_verify_origin(ofs, upperpath->dentry, in ovl_get_indexdir()
1450 oe->lowerstack[0].dentry, true); in ovl_get_indexdir()
1457 iput(ofs->workdir_trap); in ovl_get_indexdir()
1458 ofs->workdir_trap = NULL; in ovl_get_indexdir()
1459 dput(ofs->workdir); in ovl_get_indexdir()
1460 ofs->workdir = NULL; in ovl_get_indexdir()
1465 ofs->indexdir = indexdir; in ovl_get_indexdir()
1466 ofs->workdir = dget(indexdir); in ovl_get_indexdir()
1468 err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap, in ovl_get_indexdir()
1477 * upper dir file handle. In any case, verify or set xattr in ovl_get_indexdir()
1481 if (ovl_check_origin_xattr(ofs, ofs->indexdir)) { in ovl_get_indexdir()
1482 err = ovl_verify_set_fh(ofs, ofs->indexdir, in ovl_get_indexdir()
1484 upperpath->dentry, true, false); in ovl_get_indexdir()
1488 err = ovl_verify_upper(ofs, ofs->indexdir, upperpath->dentry, in ovl_get_indexdir()
1497 if (err || !ofs->indexdir) in ovl_get_indexdir()
1498 pr_warn("try deleting index dir or mounting with '-o index=off' to disable inodes index.\n"); in ovl_get_indexdir()
1509 if (!ofs->config.nfs_export && !ovl_upper_mnt(ofs)) in ovl_lower_uuid_ok()
1513 * We allow using single lower with null uuid for index and nfs_export in ovl_lower_uuid_ok()
1514 * for example to support those features with single lower squashfs. in ovl_lower_uuid_ok()
1515 * To avoid regressions in setups of overlay with re-formatted lower in ovl_lower_uuid_ok()
1516 * squashfs, do not allow decoding origin with lower null uuid unless in ovl_lower_uuid_ok()
1517 * user opted-in to one of the new features that require following the in ovl_lower_uuid_ok()
1518 * lower inode of non-dir upper. in ovl_lower_uuid_ok()
1520 if (!ofs->config.index && !ofs->config.metacopy && !ofs->config.xino && in ovl_lower_uuid_ok()
1524 for (i = 0; i < ofs->numfs; i++) { in ovl_lower_uuid_ok()
1526 * We use uuid to associate an overlay lower file handle with a in ovl_lower_uuid_ok()
1527 * lower layer, so we can accept lower fs with null uuid as long in ovl_lower_uuid_ok()
1528 * as all lower layers with null uuid are on the same fs. in ovl_lower_uuid_ok()
1529 * if we detect multiple lower fs with the same uuid, we in ovl_lower_uuid_ok()
1530 * disable lower file handle decoding on all of them. in ovl_lower_uuid_ok()
1532 if (ofs->fs[i].is_lower && in ovl_lower_uuid_ok()
1533 uuid_equal(&ofs->fs[i].sb->s_uuid, uuid)) { in ovl_lower_uuid_ok()
1534 ofs->fs[i].bad_uuid = true; in ovl_lower_uuid_ok()
1544 struct super_block *sb = path->mnt->mnt_sb; in ovl_get_fsid()
1550 for (i = 0; i < ofs->numfs; i++) { in ovl_get_fsid()
1551 if (ofs->fs[i].sb == sb) in ovl_get_fsid()
1555 if (!ovl_lower_uuid_ok(ofs, &sb->s_uuid)) { in ovl_get_fsid()
1557 if (ofs->config.index || ofs->config.nfs_export) { in ovl_get_fsid()
1558 ofs->config.index = false; in ovl_get_fsid()
1559 ofs->config.nfs_export = false; in ovl_get_fsid()
1560 pr_warn("%s uuid detected in lower fs '%pd2', falling back to index=off,nfs_export=off.\n", in ovl_get_fsid()
1561 uuid_is_null(&sb->s_uuid) ? "null" : in ovl_get_fsid()
1563 path->dentry); in ovl_get_fsid()
1573 ofs->fs[ofs->numfs].sb = sb; in ovl_get_fsid()
1574 ofs->fs[ofs->numfs].pseudo_dev = dev; in ovl_get_fsid()
1575 ofs->fs[ofs->numfs].bad_uuid = bad_uuid; in ovl_get_fsid()
1577 return ofs->numfs++; in ovl_get_fsid()
1587 err = -ENOMEM; in ovl_get_layers()
1588 ofs->fs = kcalloc(numlower + 1, sizeof(struct ovl_sb), GFP_KERNEL); in ovl_get_layers()
1589 if (ofs->fs == NULL) in ovl_get_layers()
1592 /* idx/fsid 0 are reserved for upper fs even with lower only overlay */ in ovl_get_layers()
1593 ofs->numfs++; in ovl_get_layers()
1596 * All lower layers that share the same fs as upper layer, use the same in ovl_get_layers()
1597 * pseudo_dev as upper layer. Allocate fs[0].pseudo_dev even for lower in ovl_get_layers()
1599 * is_lower will be set if upper fs is shared with a lower layer. in ovl_get_layers()
1601 err = get_anon_bdev(&ofs->fs[0].pseudo_dev); in ovl_get_layers()
1608 ofs->fs[0].sb = ovl_upper_mnt(ofs)->mnt_sb; in ovl_get_layers()
1609 ofs->fs[0].is_lower = false; in ovl_get_layers()
1622 * Check if lower root conflicts with this overlay layers before in ovl_get_layers()
1623 * checking if it is in-use as upperdir/workdir of "another" in ovl_get_layers()
1625 * the upperdir/workdir is in fact in-use by our in ovl_get_layers()
1649 * Make lower layers R/O. That way fchmod/fchown on lower file in ovl_get_layers()
1650 * will fail instead of modifying lower fs. in ovl_get_layers()
1652 mnt->mnt_flags |= MNT_READONLY | MNT_NOATIME; in ovl_get_layers()
1654 layers[ofs->numlayer].trap = trap; in ovl_get_layers()
1655 layers[ofs->numlayer].mnt = mnt; in ovl_get_layers()
1656 layers[ofs->numlayer].idx = ofs->numlayer; in ovl_get_layers()
1657 layers[ofs->numlayer].fsid = fsid; in ovl_get_layers()
1658 layers[ofs->numlayer].fs = &ofs->fs[fsid]; in ovl_get_layers()
1659 ofs->numlayer++; in ovl_get_layers()
1660 ofs->fs[fsid].is_lower = true; in ovl_get_layers()
1672 if (ofs->numfs - !ovl_upper_mnt(ofs) == 1) { in ovl_get_layers()
1673 if (ofs->config.xino == OVL_XINO_ON) in ovl_get_layers()
1675 ofs->xino_mode = 0; in ovl_get_layers()
1676 } else if (ofs->config.xino == OVL_XINO_OFF) { in ovl_get_layers()
1677 ofs->xino_mode = -1; in ovl_get_layers()
1678 } else if (ofs->xino_mode < 0) { in ovl_get_layers()
1682 * lower only overlay) +1 extra bit is reserved for the non in ovl_get_layers()
1684 * xino lower bits overflow. in ovl_get_layers()
1687 ofs->xino_mode = ilog2(ofs->numfs - 1) + 2; in ovl_get_layers()
1690 if (ofs->xino_mode > 0) { in ovl_get_layers()
1692 ofs->xino_mode); in ovl_get_layers()
1701 const char *lower, unsigned int numlower, in ovl_get_lowerstack() argument
1709 if (!ofs->config.upperdir && numlower == 1) { in ovl_get_lowerstack()
1711 return ERR_PTR(-EINVAL); in ovl_get_lowerstack()
1716 return ERR_PTR(-ENOMEM); in ovl_get_lowerstack()
1718 err = -EINVAL; in ovl_get_lowerstack()
1720 err = ovl_lower_dir(lower, &stack[i], ofs, &sb->s_stack_depth); in ovl_get_lowerstack()
1724 lower = strchr(lower, '\0') + 1; in ovl_get_lowerstack()
1727 err = -EINVAL; in ovl_get_lowerstack()
1728 sb->s_stack_depth++; in ovl_get_lowerstack()
1729 if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) { in ovl_get_lowerstack()
1738 err = -ENOMEM; in ovl_get_lowerstack()
1744 oe->lowerstack[i].dentry = dget(stack[i].dentry); in ovl_get_lowerstack()
1745 oe->lowerstack[i].layer = &ofs->layers[i+1]; in ovl_get_lowerstack()
1762 * - another layer of this overlayfs instance
1763 * - upper/work dir of any overlayfs instance
1780 err = -ELOOP; in ovl_check_layer()
1804 err = ovl_check_layer(sb, ofs, ovl_upper_mnt(ofs)->mnt_root, in ovl_check_overlapping_layers()
1813 * workbasedir. In that case, we already have their traps in in ovl_check_overlapping_layers()
1814 * inode cache and we will catch that case on lookup. in ovl_check_overlapping_layers()
1816 err = ovl_check_layer(sb, ofs, ofs->workbasedir, "workdir", in ovl_check_overlapping_layers()
1822 for (i = 1; i < ofs->numlayer; i++) { in ovl_check_overlapping_layers()
1824 ofs->layers[i].mnt->mnt_root, in ovl_check_overlapping_layers()
1838 struct ovl_path *lowerpath = &oe->lowerstack[0]; in ovl_get_root()
1839 unsigned long ino = d_inode(lowerpath->dentry)->i_ino; in ovl_get_root()
1840 int fsid = lowerpath->layer->fsid; in ovl_get_root()
1850 root->d_fsdata = oe; in ovl_get_root()
1854 ino = d_inode(upperdentry)->i_ino; in ovl_get_root()
1861 /* Root is always merge -> can have whiteouts */ in ovl_get_root()
1883 sb->s_d_op = &ovl_dentry_operations; in ovl_fill_super()
1885 err = -ENOMEM; in ovl_fill_super()
1890 ofs->creator_cred = cred = prepare_creds(); in ovl_fill_super()
1895 ofs->share_whiteout = true; in ovl_fill_super()
1897 ofs->config.index = ovl_index_def; in ovl_fill_super()
1898 ofs->config.nfs_export = ovl_nfs_export_def; in ovl_fill_super()
1899 ofs->config.xino = ovl_xino_def(); in ovl_fill_super()
1900 ofs->config.metacopy = ovl_metacopy_def; in ovl_fill_super()
1901 err = ovl_parse_opt((char *) data, &ofs->config); in ovl_fill_super()
1905 err = -EINVAL; in ovl_fill_super()
1906 if (!ofs->config.lowerdir) { in ovl_fill_super()
1912 err = -ENOMEM; in ovl_fill_super()
1913 splitlower = kstrdup(ofs->config.lowerdir, GFP_KERNEL); in ovl_fill_super()
1919 pr_err("too many lower directories, limit is %d\n", in ovl_fill_super()
1928 ofs->layers = layers; in ovl_fill_super()
1930 ofs->numlayer = 1; in ovl_fill_super()
1932 sb->s_stack_depth = 0; in ovl_fill_super()
1933 sb->s_maxbytes = MAX_LFS_FILESIZE; in ovl_fill_super()
1934 atomic_long_set(&ofs->last_ino, 1); in ovl_fill_super()
1936 if (ofs->config.xino != OVL_XINO_OFF) { in ovl_fill_super()
1937 ofs->xino_mode = BITS_PER_LONG - 32; in ovl_fill_super()
1938 if (!ofs->xino_mode) { in ovl_fill_super()
1940 ofs->config.xino = OVL_XINO_OFF; in ovl_fill_super()
1945 sb->s_op = &ovl_super_operations; in ovl_fill_super()
1947 if (ofs->config.upperdir) { in ovl_fill_super()
1950 if (!ofs->config.workdir) { in ovl_fill_super()
1959 upper_sb = ovl_upper_mnt(ofs)->mnt_sb; in ovl_fill_super()
1961 ofs->errseq = errseq_sample(&upper_sb->s_wb_err); in ovl_fill_super()
1962 if (errseq_check(&upper_sb->s_wb_err, ofs->errseq)) { in ovl_fill_super()
1963 err = -EIO; in ovl_fill_super()
1973 if (!ofs->workdir) in ovl_fill_super()
1974 sb->s_flags |= SB_RDONLY; in ovl_fill_super()
1976 sb->s_stack_depth = upper_sb->s_stack_depth; in ovl_fill_super()
1977 sb->s_time_gran = upper_sb->s_time_gran; in ovl_fill_super()
1986 sb->s_flags |= SB_RDONLY; in ovl_fill_super()
1988 if (!ovl_force_readonly(ofs) && ofs->config.index) { in ovl_fill_super()
1994 if (!ofs->indexdir) in ovl_fill_super()
1995 sb->s_flags |= SB_RDONLY; in ovl_fill_super()
2003 if (!ofs->indexdir) { in ovl_fill_super()
2004 ofs->config.index = false; in ovl_fill_super()
2005 if (ovl_upper_mnt(ofs) && ofs->config.nfs_export) { in ovl_fill_super()
2007 ofs->config.nfs_export = false; in ovl_fill_super()
2011 if (ofs->config.metacopy && ofs->config.nfs_export) { in ovl_fill_super()
2013 ofs->config.nfs_export = false; in ovl_fill_super()
2016 if (ofs->config.nfs_export) in ovl_fill_super()
2017 sb->s_export_op = &ovl_export_operations; in ovl_fill_super()
2020 cap_lower(cred->cap_effective, CAP_SYS_RESOURCE); in ovl_fill_super()
2022 sb->s_magic = OVERLAYFS_SUPER_MAGIC; in ovl_fill_super()
2023 sb->s_xattr = ovl_xattr_handlers; in ovl_fill_super()
2024 sb->s_fs_info = ofs; in ovl_fill_super()
2025 sb->s_flags |= SB_POSIXACL; in ovl_fill_super()
2026 sb->s_iflags |= SB_I_SKIP_SYNC; in ovl_fill_super()
2028 err = -ENOMEM; in ovl_fill_super()
2036 sb->s_root = root_dentry; in ovl_fill_super()
2069 inode_init_once(&oi->vfs_inode); in ovl_inode_init_once()
2082 return -ENOMEM; in ovl_init()