[U-Boot] [PATCH] ext4: add support for filesystems without JOURNAL

[Lukasz Majewski <lukma@denx.de>]

On Fri, 21 Jun 2019 15:35:35 +0200
Marek Szyprowski <m.szyprowski@samsung.com> wrote:

> 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 <m.szyprowski@samsung.com>
> ---
>  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 6adbab93a68..3559daf11d2 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 c9cf195f333..43fb8e76641 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 */ 

Reviewed-by: Lukasz Majewski <lukma@denx.de>


Best regards,

Lukasz Majewski

--

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