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From 93c33e6a7f3b0aef99d02252e6232a3d8b80f2d5 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Sun, 21 Jan 2018 15:47:50 +0100
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Subject: ubifs: Add option to create UBI FS version 4 on empty UBI volume
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Instead of creating an ubifs file system with format version 5 by
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default on empty UBI volumes add a compile option to create an older ubi
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with file system format version 4 instated. This allows it to be mount
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as a volume on kernel versions < 4.10, which does not support format
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version 5.
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We saw that some people can not access their older data when they
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downgraded from kernel 4.14 to kernel 4.9 to prevent this this option
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would help.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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fs/ubifs/Kconfig | 13 +++++++++++++
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fs/ubifs/sb.c | 6 ++++++
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2 files changed, 19 insertions(+)
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--- a/fs/ubifs/Kconfig
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+++ b/fs/ubifs/Kconfig
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@@ -85,3 +85,16 @@ config UBIFS_FS_SECURITY
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the extended attribute support in advance.
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If you are not using a security module, say N.
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+
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+config UBIFS_FS_FORMAT4
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+ bool "Use file system format version 4 for new file systems"
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+ depends on UBIFS_FS
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+ help
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+ Instead of creating new file systems with the new ubifs file
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+ system version 5, use the old format version 4 for implicitly
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+ by the driver created file systems on an empty UBI volume. This
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+ makes it possible to mount these file systems also with kernel
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+ versions before 4.10. The driver will still support file system
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+ format version 5 for ubifs file systems created with version 5.
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+
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+ If you are unsure, say N.
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--- a/fs/ubifs/sb.c
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+++ b/fs/ubifs/sb.c
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@@ -176,7 +176,9 @@ static int create_default_filesystem(str
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tmp64 = (long long)max_buds * c->leb_size;
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if (big_lpt)
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sup_flags |= UBIFS_FLG_BIGLPT;
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+#ifndef CONFIG_UBIFS_FS_FORMAT4
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sup_flags |= UBIFS_FLG_DOUBLE_HASH;
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+#endif
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sup->ch.node_type = UBIFS_SB_NODE;
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sup->key_hash = UBIFS_KEY_HASH_R5;
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@@ -192,7 +194,11 @@ static int create_default_filesystem(str
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sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT);
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sup->fanout = cpu_to_le32(DEFAULT_FANOUT);
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sup->lsave_cnt = cpu_to_le32(c->lsave_cnt);
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+#ifdef CONFIG_UBIFS_FS_FORMAT4
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+ sup->fmt_version = cpu_to_le32(4);
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+#else
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sup->fmt_version = cpu_to_le32(UBIFS_FORMAT_VERSION);
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+#endif
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sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN);
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if (c->mount_opts.override_compr)
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sup->default_compr = cpu_to_le16(c->mount_opts.compr_type);
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