From bd8fbd8a13b8a696aed312753f46432b19b61fd6 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Fri, 21 Jun 2019 15:35:35 +0200 Subject: [PATCH] ext4: add support for filesystems without JOURNAL JOURNAL is optional for EXT4 (and EXT3) filesystems, so add support for skipping it. This fixes corrupting EXT4 volumes without JOURNAL after using uboot's 'ext4write' command. Signed-off-by: Marek Szyprowski Reviewed-by: Lukasz Majewski --- fs/ext4/ext4_journal.c | 4 ++++ fs/ext4/ext4_journal.h | 2 ++ 2 files changed, 6 insertions(+) diff --git a/fs/ext4/ext4_journal.c b/fs/ext4/ext4_journal.c index 6adbab93a6..3559daf11d 100644 --- a/fs/ext4/ext4_journal.c +++ b/fs/ext4/ext4_journal.c @@ -645,6 +645,10 @@ void ext4fs_update_journal(void) struct ext_filesystem *fs = get_fs(); long int blknr; int i; + + if (!(fs->sb->feature_compatibility & EXT4_FEATURE_COMPAT_HAS_JOURNAL)) + return; + ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO, &inode_journal); blknr = read_allocated_block(&inode_journal, jrnl_blk_idx++, NULL); update_descriptor_block(blknr); diff --git a/fs/ext4/ext4_journal.h b/fs/ext4/ext4_journal.h index c9cf195f33..43fb8e7664 100644 --- a/fs/ext4/ext4_journal.h +++ b/fs/ext4/ext4_journal.h @@ -17,6 +17,8 @@ #ifndef __EXT4_JRNL__ #define __EXT4_JRNL__ +#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 + #define EXT2_JOURNAL_INO 8 /* Journal inode */ #define EXT2_JOURNAL_SUPERBLOCK 0 /* Journal Superblock number */ -- 2.25.1