On Thu, Jan 02, 2020 at 04:20:24PM +0800, Namjae Jeon wrote:
> This adds in-memory and on-disk structures and headers.
>
> Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
> Signed-off-by: Sungjong Seo <sj1557.seo@xxxxxxxxxxx>
This looks good modulo a few cosmetic nitpicks below.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> --- /dev/null
> +++ b/fs/exfat/exfat_fs.h
> @@ -0,0 +1,569 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
> + */
> +
> +#ifndef _EXFAT_H
> +#define _EXFAT_H
This should probably be _EXFAT_FS_H to match the actual file name.
> +
> +#include <linux/fs.h>
> +#include <linux/ratelimit.h>
> +
> +#define EXFAT_SUPER_MAGIC (0x2011BAB0UL)
No need for the braces.
> +/*
> + * exfat common MACRO
> + */
Not sure this comment is all that helpful.
> +#define CLUSTER_32(x) ((unsigned int)((x) & 0xFFFFFFFFU))
This could just use lower_32_bits().
> +#define EXFAT_BAD_CLUSTER (0xFFFFFFF7U)
> +#define EXFAT_FREE_CLUSTER (0)
> +/* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */
> +#define EXFAT_RESERVED_CLUSTERS (2)
> +#define EXFAT_FIRST_CLUSTER (2)
No need for the braces.
> +/* type values */
> +#define TYPE_UNUSED 0x0000
> +#define TYPE_DELETED 0x0001
> +#define TYPE_INVALID 0x0002
> +#define TYPE_CRITICAL_PRI 0x0100
> +#define TYPE_BITMAP 0x0101
> +#define TYPE_UPCASE 0x0102
> +#define TYPE_VOLUME 0x0103
> +#define TYPE_DIR 0x0104
> +#define TYPE_FILE 0x011F
> +#define TYPE_CRITICAL_SEC 0x0200
> +#define TYPE_STREAM 0x0201
> +#define TYPE_EXTEND 0x0202
> +#define TYPE_ACL 0x0203
> +#define TYPE_BENIGN_PRI 0x0400
> +#define TYPE_GUID 0x0401
> +#define TYPE_PADDING 0x0402
> +#define TYPE_ACLTAB 0x0403
> +#define TYPE_BENIGN_SEC 0x0800
> +#define TYPE_ALL 0x0FFF
Shouldn't this go into exfat_raw.h? Maybe check if a few other
values should as well if they define an on-disk format.
> +static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,
> + unsigned int clus)
> +{
> + return ((clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits)
> + + sbi->data_start_sector;
Nitpick: normally we put the operators at the of the previous line in
Linux code.
> +#define EXFAT_DELETE ~(0x80)
The braces would more useful outside the ~.
> +#define file_num_ext dentry.file.num_ext
> +#define file_checksum dentry.file.checksum
> +#define file_attr dentry.file.attr
> +#define file_create_time dentry.file.create_time
> +#define file_create_date dentry.file.create_date
> +#define file_modify_time dentry.file.modify_time
> +#define file_modify_date dentry.file.modify_date
> +#define file_access_time dentry.file.access_time
> +#define file_access_date dentry.file.access_date
> +#define file_create_time_ms dentry.file.create_time_ms
> +#define file_modify_time_ms dentry.file.modify_time_ms
> +#define file_create_tz dentry.file.create_tz
> +#define file_modify_tz dentry.file.modify_tz
> +#define file_access_tz dentry.file.access_tz
> +#define stream_flags dentry.stream.flags
> +#define stream_name_len dentry.stream.name_len
> +#define stream_name_hash dentry.stream.name_hash
> +#define stream_start_clu dentry.stream.start_clu
> +#define stream_valid_size dentry.stream.valid_size
> +#define stream_size dentry.stream.size
> +#define name_flags dentry.name.flags
> +#define name_unicode dentry.name.unicode_0_14
> +#define bitmap_flags dentry.bitmap.flags
> +#define bitmap_start_clu dentry.bitmap.start_clu
> +#define bitmap_size dentry.bitmap.size
> +#define upcase_start_clu dentry.upcase.start_clu
> +#define upcase_size dentry.upcase.size
> +#define upcase_checksum dentry.upcase.checksum
Personally I don't find these defines very helpful - directly seeing
the field name makes the code much easier to read.
