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Message-ID: <716101d692d6$ef1dc2d0$cd594870$@samsung.com>
Date: Fri, 25 Sep 2020 09:58:08 +0900
From: "Sungjong Seo" <sj1557.seo@...sung.com>
To: "'Tetsuhiro Kohada'" <kohada.t2@...il.com>
Cc: <kohada.tetsuhiro@...mitsubishielectric.co.jp>,
<mori.takahiro@...mitsubishielectric.co.jp>,
"'Namjae Jeon'" <namjae.jeon@...sung.com>,
<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] exfat: remove 'rwoffset' in exfat_inode_info
> 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@...il.com>
Acked-by: Sungjong Seo <sj1557.seo@...sung.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
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