linux-kernel - Re: [PATCH v10 04/14] exfat: add directory operations

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Message-ID: <20200117111342.nijcivt4z6io6xtt@pali>
Date:   Fri, 17 Jan 2020 12:13:42 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Namjae Jeon <namjae.jeon@...sung.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        gregkh@...uxfoundation.org, valdis.kletnieks@...edu, hch@....de,
        sj1557.seo@...sung.com, linkinjeon@...il.com, arnd@...db.de
Subject: Re: [PATCH v10 04/14] exfat: add directory operations

On Wednesday 15 January 2020 17:24:37 Namjae Jeon wrote:
> This adds the implementation of directory operations for exfat.
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> Signed-off-by: Sungjong Seo <sj1557.seo@...sung.com>
> ---
>  fs/exfat/dir.c | 1244 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 1244 insertions(+)
>  create mode 100644 fs/exfat/dir.c
> 
> diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
> new file mode 100644
> index 000000000000..81a95557a6a3
> --- /dev/null
> +++ b/fs/exfat/dir.c

...

> +/* read a directory entry from the opened directory */
> +static int exfat_readdir(struct inode *inode, struct exfat_dir_entry *dir_entry)
> +{

...

> +	while (clu.dir != EXFAT_EOF_CLUSTER) {
> +		i = dentry & (dentries_per_clu - 1);
> +
> +		for ( ; i < dentries_per_clu; i++, dentry++) {
> +			ep = exfat_get_dentry(sb, &clu, i, &bh, &sector);
> +			if (!ep)
> +				return -EIO;
> +
> +			type = exfat_get_entry_type(ep);
> +			if (type == TYPE_UNUSED) {
> +				brelse(bh);
> +				break;
> +			}
> +
> +			if (type != TYPE_FILE && type != TYPE_DIR) {
> +				brelse(bh);
> +				continue;
> +			}
> +
> +			dir_entry->attr = le16_to_cpu(ep->dentry.file.attr);
> +			exfat_get_entry_time(sbi, &dir_entry->ctime,
> +					ep->dentry.file.create_time,
> +					ep->dentry.file.create_date,
> +					ep->dentry.file.create_tz);

Hello, here is missing processing of create_time_ms entry. I think that
exfat_get_entry_time() should be extended to take (optional) time_ms
parameter. time_ms is only for create_time nad modify_time (not for
access_time).

> +			exfat_get_entry_time(sbi, &dir_entry->mtime,
> +					ep->dentry.file.modify_time,
> +					ep->dentry.file.modify_date,
> +					ep->dentry.file.modify_tz);

Similarly there is missing processing of modify_time_ms entry.

> +			exfat_get_entry_time(sbi, &dir_entry->atime,
> +					ep->dentry.file.access_time,
> +					ep->dentry.file.access_date,
> +					ep->dentry.file.access_tz);
> +
> +			*uni_name.name = 0x0;
> +			exfat_get_uniname_from_ext_entry(sb, &dir, dentry,
> +				uni_name.name);
> +			exfat_utf16_to_nls(sb, &uni_name,
> +				dir_entry->namebuf.lfn,
> +				dir_entry->namebuf.lfnbuf_len);
> +			brelse(bh);
> +
> +			ep = exfat_get_dentry(sb, &clu, i + 1, &bh, NULL);
> +			if (!ep)
> +				return -EIO;
> +			dir_entry->size =
> +				le64_to_cpu(ep->dentry.stream.valid_size);
> +			brelse(bh);
> +
> +			ei->hint_bmap.off = dentry >> dentries_per_clu_bits;
> +			ei->hint_bmap.clu = clu.dir;
> +
> +			ei->rwoffset = ++dentry;
> +			return 0;
> +		}
> +

-- 
Pali Rohár
pali.rohar@...il.com