Re: [PATCH v2] staging: exfat: remove 'vol_type' variable.

From: Greg Kroah-Hartman
Date: Fri Feb 07 2020 - 04:42:59 EST

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On Thu, Jan 30, 2020 at 04:06:13PM +0900, Tetsuhiro Kohada wrote:
> remove 'vol_type' variable.
>
> The following issues are described in exfat's TODO.
> > clean up the remaining vol_type checks, which are of two types:
> > some are ?: operators with magic numbers, and the rest are places
> > where we're doing stuff with '.' and '..'.
>
> The vol_type variable is always set to 'EXFAT'.
> The variable checks are unnessesary, so remove unused code.
>
> Signed-off-by: Tetsuhiro Kohada <Kohada.Tetsuhiro@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Mori Takahiro <Mori.Takahiro@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> Changes in v2:
> - Remove wrong check in exfat_readdir(), as suggested by Dan Carpenter.
> - Update comment in exfat_readdir().
>
> drivers/staging/exfat/exfat.h | 1 -
> drivers/staging/exfat/exfat_core.c | 26 +++----------
> drivers/staging/exfat/exfat_super.c | 60 ++++++++++-------------------
> 3 files changed, 27 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/staging/exfat/exfat.h b/drivers/staging/exfat/exfat.h
> index 4d87360fab35..28d245b10e82 100644
> --- a/drivers/staging/exfat/exfat.h
> +++ b/drivers/staging/exfat/exfat.h
> @@ -518,7 +518,6 @@ struct buf_cache_t {
>
> struct fs_info_t {
> u32 drv; /* drive ID */
> - u32 vol_type; /* volume FAT type */
> u32 vol_id; /* volume serial number */
>
> u64 num_sectors; /* num of sectors in volume */
> diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
> index 07b460d01334..5a686289a1db 100644
> --- a/drivers/staging/exfat/exfat_core.c
> +++ b/drivers/staging/exfat/exfat_core.c
> @@ -1560,11 +1560,7 @@ static s32 search_deleted_or_unused_entry(struct super_block *sb,
> if (num_empty >= num_entries) {
> p_fs->hint_uentry.dir = CLUSTER_32(~0);
> p_fs->hint_uentry.entry = -1;
> -
> - if (p_fs->vol_type == EXFAT)
> - return dentry - (num_entries - 1);
> - else
> - return dentry;
> + return dentry - (num_entries - 1);
> }
> }
>
> @@ -1914,7 +1910,7 @@ s32 count_dos_name_entries(struct super_block *sb, struct chain_t *p_dir,
>
> bool is_dir_empty(struct super_block *sb, struct chain_t *p_dir)
> {
> - int i, count = 0;
> + int i;
> s32 dentries_per_clu;
> u32 type;
> struct chain_t clu;
> @@ -1943,15 +1939,7 @@ bool is_dir_empty(struct super_block *sb, struct chain_t *p_dir)
>
> if (type == TYPE_UNUSED)
> return true;
> - if ((type != TYPE_FILE) && (type != TYPE_DIR))
> - continue;
> -
> - if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
> - return false;
> -
> - if (p_fs->vol_type == EXFAT)
> - return false;
> - if ((p_dir->dir == p_fs->root_dir) || ((++count) > 2))
> + if ((type == TYPE_FILE) || (type == TYPE_DIR))
> return false;
> }
>
> @@ -2128,7 +2116,6 @@ s32 exfat_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
> p_fs->num_clusters = GET32(p_bpb->clu_count) + 2;
> /* because the cluster index starts with 2 */
>
> - p_fs->vol_type = EXFAT;
> p_fs->vol_id = GET32(p_bpb->vol_serial);
>
> p_fs->root_dir = GET32(p_bpb->root_cluster);
> @@ -2165,7 +2152,7 @@ s32 create_dir(struct inode *inode, struct chain_t *p_dir,
>
> clu.dir = CLUSTER_32(~0);
> clu.size = 0;
> - clu.flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + clu.flags = 0x03;
>
> /* (1) allocate a cluster */
> ret = exfat_alloc_cluster(sb, 1, &clu);
> @@ -2198,7 +2185,7 @@ s32 create_dir(struct inode *inode, struct chain_t *p_dir,
> fid->entry = dentry;
>
> fid->attr = ATTR_SUBDIR;
> - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + fid->flags = 0x03;
> fid->size = size;
> fid->start_clu = clu.dir;
>
> @@ -2215,7 +2202,6 @@ s32 create_file(struct inode *inode, struct chain_t *p_dir,
> s32 ret, dentry, num_entries;
> struct dos_name_t dos_name;
> struct super_block *sb = inode->i_sb;
> - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
>
> ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
> &dos_name);
> @@ -2247,7 +2233,7 @@ s32 create_file(struct inode *inode, struct chain_t *p_dir,
> fid->entry = dentry;
>
> fid->attr = ATTR_ARCHIVE | mode;
> - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + fid->flags = 0x03;
> fid->size = 0;
> fid->start_clu = CLUSTER_32(~0);
>
> diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c
> index b81d2a87b82e..da4ee387b70b 100644
> --- a/drivers/staging/exfat/exfat_super.c
> +++ b/drivers/staging/exfat/exfat_super.c
> @@ -494,7 +494,7 @@ static int ffsGetVolInfo(struct super_block *sb, struct vol_info_t *info)
> if (p_fs->used_clusters == UINT_MAX)
> p_fs->used_clusters = exfat_count_used_clusters(sb);
>
> - info->FatType = p_fs->vol_type;
> + info->FatType = EXFAT;
> info->ClusterSize = p_fs->cluster_size;
> info->NumClusters = p_fs->num_clusters - 2; /* clu 0 & 1 */
> info->UsedClusters = p_fs->used_clusters;
> @@ -602,7 +602,7 @@ static int ffsLookupFile(struct inode *inode, char *path, struct file_id_t *fid)
>
> fid->size = exfat_get_entry_size(ep2);
> if ((fid->type == TYPE_FILE) && (fid->size == 0)) {
> - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + fid->flags = 0x03;
> fid->start_clu = CLUSTER_32(~0);
> } else {
> fid->flags = exfat_get_entry_flag(ep2);
> @@ -1095,7 +1095,7 @@ static int ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size)
> fid->size = new_size;
> fid->attr |= ATTR_ARCHIVE;
> if (new_size == 0) {
> - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + fid->flags = 0x03;
> fid->start_clu = CLUSTER_32(~0);
> }
>
> @@ -1203,14 +1203,6 @@ static int ffsMoveFile(struct inode *old_parent_inode, struct file_id_t *fid,
>
> dentry = fid->entry;
>
> - /* check if the old file is "." or ".." */
> - if (p_fs->vol_type != EXFAT) {
> - if ((olddir.dir != p_fs->root_dir) && (dentry < 2)) {
> - ret = -EPERM;
> - goto out2;
> - }
> - }
> -
> ep = get_entry_in_dir(sb, &olddir, dentry, NULL);
> if (!ep) {
> ret = -ENOENT;
> @@ -1342,7 +1334,7 @@ static int ffsRemoveFile(struct inode *inode, struct file_id_t *fid)
>
> fid->size = 0;
> fid->start_clu = CLUSTER_32(~0);
> - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + fid->flags = 0x03;
>
> #ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC
> fs_sync(sb, true);
> @@ -2020,12 +2012,6 @@ static int ffsRemoveDir(struct inode *inode, struct file_id_t *fid)
>
> dentry = fid->entry;
>
> - /* check if the file is "." or ".." */
> - if (p_fs->vol_type != EXFAT) {
> - if ((dir.dir != p_fs->root_dir) && (dentry < 2))
> - return -EPERM;
> - }
> -
> /* acquire the lock for file system critical section */
> mutex_lock(&p_fs->v_mutex);
>
> @@ -2048,7 +2034,7 @@ static int ffsRemoveDir(struct inode *inode, struct file_id_t *fid)
>
> fid->size = 0;
> fid->start_clu = CLUSTER_32(~0);
> - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
> + fid->flags = 0x03;
>
> #ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC
> fs_sync(sb, true);
> @@ -2073,8 +2059,6 @@ static int exfat_readdir(struct file *filp, struct dir_context *ctx)
> {
> struct inode *inode = file_inode(filp);
> struct super_block *sb = inode->i_sb;
> - struct exfat_sb_info *sbi = EXFAT_SB(sb);
> - struct fs_info_t *p_fs = &sbi->fs_info;
> struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
> struct dir_entry_t de;
> unsigned long inum;
> @@ -2084,24 +2068,22 @@ static int exfat_readdir(struct file *filp, struct dir_context *ctx)
> __lock_super(sb);
>
> cpos = ctx->pos;
> - /* Fake . and .. for the root directory. */
> - if ((p_fs->vol_type == EXFAT) || (inode->i_ino == EXFAT_ROOT_INO)) {
> - while (cpos < 2) {
> - if (inode->i_ino == EXFAT_ROOT_INO)
> - inum = EXFAT_ROOT_INO;
> - else if (cpos == 0)
> - inum = inode->i_ino;
> - else /* (cpos == 1) */
> - inum = parent_ino(filp->f_path.dentry);
> -
> - if (!dir_emit_dots(filp, ctx))
> - goto out;
> - cpos++;
> - ctx->pos++;
> - }
> - if (cpos == 2)
> - cpos = 0;
> + /* Fake . and .. for any directory. */
> + while (cpos < 2) {
> + if (inode->i_ino == EXFAT_ROOT_INO)
> + inum = EXFAT_ROOT_INO;
> + else if (cpos == 0)
> + inum = inode->i_ino;
> + else /* (cpos == 1) */
> + inum = parent_ino(filp->f_path.dentry);
> +

Always run checkpatch on your patches :(

I've fixed this trailing whitespace up on my own...

greg k-h

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