linux-ext4 - Re: [PATCH v4 1/7] e2fsck: add support for dirdata feature

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Date:   Fri, 4 May 2018 03:03:35 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Artem Blagodarenko <artem.blagodarenko@...il.com>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Zhenyu Xu <bobijam.xu@...el.com>,
        Manisha Salve <msalve@....com>,
        Pravin Shelar <pravin@...sterfs.com>
Subject: Re: [PATCH v4 1/7] e2fsck: add support for dirdata feature

On May 4, 2018, at 1:09 AM, c17828 <artem.blagodarenko@...il.com> wrote:
> 
> From: Andreas Dilger <andreas.dilger@...el.com>
> 
> Add support for the INCOMPAT_DIRDATA feature, which allows
> storing extra data in the directory entry beyond the name.
> This allows the Lustre File IDentifier to be accessed in
> an efficient manner, and would be useful for expanding a
> filesystem to allow more than 2^32 inodes in the future.
> 
> Lustre-bug: https://jira.hpdd.intel.com/browse/LU-4677
> Signed-off-by: Pravin Shelar <pravin@...sterfs.com>
> Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...il.com>
> ---
> 
> +/*
> + * check for dirent data in ext3 dirent.
> + * return 0 if dirent data is ok.
> + * return 1 if dirent data does not exist.
> + * return 2 if dirent was modified due to error.
> + */
> +int e2fsck_check_dirent_data(e2fsck_t ctx, struct ext2_dir_entry *de,
> +			     unsigned int offset, struct problem_context *pctx)
> +{
> +	if (!(ctx->fs->super->s_feature_incompat &
> +			EXT4_FEATURE_INCOMPAT_DIRDATA)) {

This should use:
	if (ext2fs_has_feature_incompat_dirdata(ctx->fs->super)) {

but it wasn't in the original patch since those macros didn't exist back then.
However, it looks like the EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, 4, DIRDATA)
macro already exists in both e2fsprogs and the kernel, so it doesn't need to
be added.

> #endif	/* _LINUX_EXT2_FS_H */
> diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
> index 6774e32c..fbe4398f 100644
> --- a/lib/ext2fs/ext2fs.h
> +++ b/lib/ext2fs/ext2fs.h
> 
> +_INLINE_ struct ext2_dx_root_info *get_ext2_dx_root_info(ext2_filsys fs,
> +							 char *buf)
> +{
> +	struct ext2_dir_entry *de = (struct ext2_dir_entry *)buf;
> +
> +	if (!(fs->super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_DIRDATA))

Similarly, this should use the proper macro:

	if (!ext2fs_has_feature_incompat_dirdata(fs->super))


Cheers, Andreas






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