kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 63 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.4/553-ubifs-Add-option-to-create-UBI-FS-version-4-on-empty.patch b/target/linux/generic/pending-5.4/553-ubifs-Add-option-to-create-UBI-FS-version-4-on-empty.patch
new file mode 100644
index 0000000000..02c9b4c0fa
--- /dev/null
+++ b/target/linux/generic/pending-5.4/553-ubifs-Add-option-to-create-UBI-FS-version-4-on-empty.patch
@@ -0,0 +1,63 @@
+From 93c33e6a7f3b0aef99d02252e6232a3d8b80f2d5 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Sun, 21 Jan 2018 15:47:50 +0100
+Subject: ubifs: Add option to create UBI FS version 4 on empty UBI volume
+
+Instead of creating an ubifs file system with format version 5 by
+default on empty UBI volumes add a compile option to create an older ubi
+with file system format version 4 instated. This allows it to be mount
+as a volume on kernel versions < 4.10, which does not support format
+version 5.
+We saw that some people can not access their older data when they
+downgraded from kernel 4.14 to kernel 4.9 to prevent this this option
+would help.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+---
+ fs/ubifs/Kconfig | 13 +++++++++++++
+ fs/ubifs/sb.c    |  6 ++++++
+ 2 files changed, 19 insertions(+)
+
+--- a/fs/ubifs/Kconfig
++++ b/fs/ubifs/Kconfig
+@@ -85,3 +85,16 @@ config UBIFS_FS_SECURITY
+ 	  the extended attribute support in advance.
+ 
+ 	  If you are not using a security module, say N.
++
++config UBIFS_FS_FORMAT4
++	bool "Use file system format version 4 for new file systems"
++	depends on UBIFS_FS
++	help
++	  Instead of creating new file systems with the new ubifs file
++	  system version 5, use the old format version 4 for implicitly
++	  by the driver created file systems on an empty UBI volume. This
++	  makes it possible to  mount these file systems also with kernel
++	  versions before 4.10. The driver will still support file system
++	  format version 5 for ubifs file systems created with version 5.
++
++	  If you are unsure, say N.
+--- a/fs/ubifs/sb.c
++++ b/fs/ubifs/sb.c
+@@ -176,7 +176,9 @@ static int create_default_filesystem(str
+ 	tmp64 = (long long)max_buds * c->leb_size;
+ 	if (big_lpt)
+ 		sup_flags |= UBIFS_FLG_BIGLPT;
++#ifndef CONFIG_UBIFS_FS_FORMAT4
+ 	sup_flags |= UBIFS_FLG_DOUBLE_HASH;
++#endif
+ 
+ 	sup->ch.node_type  = UBIFS_SB_NODE;
+ 	sup->key_hash      = UBIFS_KEY_HASH_R5;
+@@ -192,7 +194,11 @@ static int create_default_filesystem(str
+ 	sup->jhead_cnt     = cpu_to_le32(DEFAULT_JHEADS_CNT);
+ 	sup->fanout        = cpu_to_le32(DEFAULT_FANOUT);
+ 	sup->lsave_cnt     = cpu_to_le32(c->lsave_cnt);
++#ifdef CONFIG_UBIFS_FS_FORMAT4
++	sup->fmt_version   = cpu_to_le32(4);
++#else
+ 	sup->fmt_version   = cpu_to_le32(UBIFS_FORMAT_VERSION);
++#endif
+ 	sup->time_gran     = cpu_to_le32(DEFAULT_TIME_GRAN);
+ 	if (c->mount_opts.override_compr)
+ 		sup->default_compr = cpu_to_le16(c->mount_opts.compr_type);