RE: [PATCH v2] exfat: remove 'rwoffset' in exfat_inode_info

["Sungjong Seo" <sj1557.seo@samsung.com>]

> Remove 'rwoffset' in exfat_inode_info and replace it with the parameter of
> exfat_readdir().
> Since rwoffset is referenced only by exfat_readdir(), it is not necessary
> a exfat_inode_info's member.
> Also, change cpos to point to the next of entry-set, and return the index
> of dir-entry via dir_entry->entry.
> 
> Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com>

Acked-by: Sungjong Seo <sj1557.seo@samsung.com>
> ---
> Changes in v2
>  - 'cpos' point to the next of entry-set
>  - return the index of dir-entry via dir_entry->entry
>  - fix commit-message
> 
>  fs/exfat/dir.c      | 21 +++++++++------------
>  fs/exfat/exfat_fs.h |  2 --
>  fs/exfat/file.c     |  2 --
>  fs/exfat/inode.c    |  3 ---
>  fs/exfat/super.c    |  1 -
>  5 files changed, 9 insertions(+), 20 deletions(-)
> 
> diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c index
> a9b13ae3f325..82bee625549d 100644
> --- a/fs/exfat/dir.c
> +++ b/fs/exfat/dir.c
> @@ -59,9 +59,9 @@ static void exfat_get_uniname_from_ext_entry(struct
> super_block *sb,  }
> 
>  /* read a directory entry from the opened directory */ -static int
> exfat_readdir(struct inode *inode, struct exfat_dir_entry *dir_entry)
> +static int exfat_readdir(struct inode *inode, loff_t *cpos, struct
> +exfat_dir_entry *dir_entry)
>  {
> -	int i, dentries_per_clu, dentries_per_clu_bits = 0;
> +	int i, dentries_per_clu, dentries_per_clu_bits = 0, num_ext;
>  	unsigned int type, clu_offset;
>  	sector_t sector;
>  	struct exfat_chain dir, clu;
> @@ -70,7 +70,7 @@ static int exfat_readdir(struct inode *inode, struct
> exfat_dir_entry *dir_entry)
>  	struct super_block *sb = inode->i_sb;
>  	struct exfat_sb_info *sbi = EXFAT_SB(sb);
>  	struct exfat_inode_info *ei = EXFAT_I(inode);
> -	unsigned int dentry = ei->rwoffset & 0xFFFFFFFF;
> +	unsigned int dentry = EXFAT_B_TO_DEN(*cpos) & 0xFFFFFFFF;
>  	struct buffer_head *bh;
> 
>  	/* check if the given file ID is opened */ @@ -127,6 +127,7 @@
> static int exfat_readdir(struct inode *inode, struct exfat_dir_entry
> *dir_entry)
>  				continue;
>  			}
> 
> +			num_ext = ep->dentry.file.num_ext;
>  			dir_entry->attr = le16_to_cpu(ep->dentry.file.attr);
>  			exfat_get_entry_time(sbi, &dir_entry->crtime,
>  					ep->dentry.file.create_tz,
> @@ -157,12 +158,13 @@ static int exfat_readdir(struct inode *inode, struct
> exfat_dir_entry *dir_entry)
>  				return -EIO;
>  			dir_entry->size =
>  				le64_to_cpu(ep->dentry.stream.valid_size);
> +			dir_entry->entry = dentry;
>  			brelse(bh);
> 
>  			ei->hint_bmap.off = dentry >> dentries_per_clu_bits;
>  			ei->hint_bmap.clu = clu.dir;
> 
> -			ei->rwoffset = ++dentry;
> +			*cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext);
>  			return 0;
>  		}
> 
> @@ -178,7 +180,7 @@ static int exfat_readdir(struct inode *inode, struct
> exfat_dir_entry *dir_entry)
>  	}
> 
>  	dir_entry->namebuf.lfn[0] = '\0';
> -	ei->rwoffset = dentry;
> +	*cpos = EXFAT_DEN_TO_B(dentry);
>  	return 0;
>  }
> 
> @@ -242,12 +244,10 @@ static int exfat_iterate(struct file *filp, struct
> dir_context *ctx)
>  	if (err)
>  		goto unlock;
>  get_new:
> -	ei->rwoffset = EXFAT_B_TO_DEN(cpos);
> -
>  	if (cpos >= i_size_read(inode))
>  		goto end_of_dir;
> 
> -	err = exfat_readdir(inode, &de);
> +	err = exfat_readdir(inode, &cpos, &de);
>  	if (err) {
>  		/*
>  		 * At least we tried to read a sector.  Move cpos to next
> sector @@ -262,13 +262,10 @@ static int exfat_iterate(struct file *filp,
> struct dir_context *ctx)
>  		goto end_of_dir;
>  	}
> 
> -	cpos = EXFAT_DEN_TO_B(ei->rwoffset);
> -
>  	if (!nb->lfn[0])
>  		goto end_of_dir;
> 
> -	i_pos = ((loff_t)ei->start_clu << 32) |
> -		((ei->rwoffset - 1) & 0xffffffff);
> +	i_pos = ((loff_t)ei->start_clu << 32) |	(de.entry & 0xffffffff);
>  	tmp = exfat_iget(sb, i_pos);
>  	if (tmp) {
>  		inum = tmp->i_ino;
> diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h index
> 44dc04520175..e586daf5a2e7 100644
> --- a/fs/exfat/exfat_fs.h
> +++ b/fs/exfat/exfat_fs.h
> @@ -263,8 +263,6 @@ struct exfat_inode_info {
>  	 * the validation of hint_stat.
>  	 */
>  	unsigned int version;
> -	/* file offset or dentry index for readdir */
> -	loff_t rwoffset;
> 
>  	/* hint for cluster last accessed */
>  	struct exfat_hint hint_bmap;
> diff --git a/fs/exfat/file.c b/fs/exfat/file.c index
> 4831a39632a1..a92478eabfa4 100644
> --- a/fs/exfat/file.c
> +++ b/fs/exfat/file.c
> @@ -208,8 +208,6 @@ int __exfat_truncate(struct inode *inode, loff_t
> new_size)
>  	/* hint information */
>  	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
>  	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
> -	if (ei->rwoffset > new_size)
> -		ei->rwoffset = new_size;
> 
>  	/* hint_stat will be used if this is directory. */
>  	ei->hint_stat.eidx = 0;
> diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c index
> 7f90204adef5..70a33d4807c3 100644
> --- a/fs/exfat/inode.c
> +++ b/fs/exfat/inode.c
> @@ -114,8 +114,6 @@ static int exfat_map_cluster(struct inode *inode,
> unsigned int clu_offset,
>  	unsigned int local_clu_offset = clu_offset;
>  	unsigned int num_to_be_allocated = 0, num_clusters = 0;
> 
> -	ei->rwoffset = EXFAT_CLU_TO_B(clu_offset, sbi);
> -
>  	if (EXFAT_I(inode)->i_size_ondisk > 0)
>  		num_clusters =
>
EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk,
> @@ -567,7 +565,6 @@ static int exfat_fill_inode(struct inode *inode,
> struct exfat_dir_entry *info)
>  	ei->hint_stat.eidx = 0;
>  	ei->hint_stat.clu = info->start_clu;
>  	ei->hint_femp.eidx = EXFAT_HINT_NONE;
> -	ei->rwoffset = 0;
>  	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
>  	ei->i_pos = 0;
> 
> diff --git a/fs/exfat/super.c b/fs/exfat/super.c index
> 3b6a1659892f..b29935a91b9b 100644
> --- a/fs/exfat/super.c
> +++ b/fs/exfat/super.c
> @@ -342,7 +342,6 @@ static int exfat_read_root(struct inode *inode)
>  	ei->flags = ALLOC_FAT_CHAIN;
>  	ei->type = TYPE_DIR;
>  	ei->version = 0;
> -	ei->rwoffset = 0;
>  	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
>  	ei->hint_stat.eidx = 0;
>  	ei->hint_stat.clu = sbi->root_dir;
> --
> 2.25.1