[lustre-devel] [PATCH 01/37] lustre: obdclass: char obd_ioctl_getdata type.

[James Simmons <jsimmons@infradead.org>]

> Instead of having obd_ioctl_getdata() return the allocated
> data as a "char *", return it as it really is,
>  struct obd_ioctl_data *
> 
> This avoids the need for extra variables and casts.

Reviewed-by: James Simmons <jsimmons@infradead.org>
 
> Signed-off-by: NeilBrown <neilb@suse.com>
> ---
>  drivers/staging/lustre/lustre/include/obd_class.h  |    3 ++-
>  drivers/staging/lustre/lustre/llite/dir.c          |   18 ++++++------------
>  drivers/staging/lustre/lustre/llite/llite_lib.c    |    8 +++-----
>  drivers/staging/lustre/lustre/lov/lov_obd.c        |   15 ++++++---------
>  drivers/staging/lustre/lustre/obdclass/class_obd.c |   18 ++++++++----------
>  5 files changed, 25 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/staging/lustre/lustre/include/obd_class.h b/drivers/staging/lustre/lustre/include/obd_class.h
> index 30b3e2c69f83..32d4ab6e78a0 100644
> --- a/drivers/staging/lustre/lustre/include/obd_class.h
> +++ b/drivers/staging/lustre/lustre/include/obd_class.h
> @@ -1697,6 +1697,7 @@ struct root_squash_info {
>  };
>  
>  /* linux-module.c */
> -int obd_ioctl_getdata(char **buf, int *len, void __user *arg);
> +struct obd_ioctl_data;
> +int obd_ioctl_getdata(struct obd_ioctl_data **data, int *len, void __user *arg);
>  
>  #endif /* __LINUX_OBD_CLASS_H */
> diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
> index fd1af4a5cdad..17bb6185ba87 100644
> --- a/drivers/staging/lustre/lustre/llite/dir.c
> +++ b/drivers/staging/lustre/lustre/llite/dir.c
> @@ -1130,13 +1130,11 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  	}
>  	case IOC_MDC_LOOKUP: {
>  		int namelen, len = 0;
> -		char *buf = NULL;
>  		char *filename;
>  
> -		rc = obd_ioctl_getdata(&buf, &len, (void __user *)arg);
> +		rc = obd_ioctl_getdata(&data, &len, (void __user *)arg);
>  		if (rc)
>  			return rc;
> -		data = (void *)buf;
>  
>  		filename = data->ioc_inlbuf1;
>  		namelen = strlen(filename);
> @@ -1155,12 +1153,11 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  			goto out_free;
>  		}
>  out_free:
> -		kvfree(buf);
> +		kvfree(data);
>  		return rc;
>  	}
>  	case LL_IOC_LMV_SETSTRIPE: {
>  		struct lmv_user_md  *lum;
> -		char *buf = NULL;
>  		char *filename;
>  		int namelen = 0;
>  		int lumlen = 0;
> @@ -1168,11 +1165,10 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  		int len;
>  		int rc;
>  
> -		rc = obd_ioctl_getdata(&buf, &len, (void __user *)arg);
> +		rc = obd_ioctl_getdata(&data, &len, (void __user *)arg);
>  		if (rc)
>  			return rc;
>  
> -		data = (void *)buf;
>  		if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
>  		    data->ioc_inllen1 == 0 || data->ioc_inllen2 == 0) {
>  			rc = -EINVAL;
> @@ -1205,7 +1201,7 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  #endif
>  		rc = ll_dir_setdirstripe(dentry, lum, filename, mode);
>  lmv_out_free:
> -		kvfree(buf);
> +		kvfree(data);
>  		return rc;
>  	}
>  	case LL_IOC_LMV_SET_DEFAULT_STRIPE: {
> @@ -1651,18 +1647,16 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  		return rc;
>  	}
>  	case LL_IOC_MIGRATE: {
> -		char *buf = NULL;
>  		const char *filename;
>  		int namelen = 0;
>  		int len;
>  		int rc;
>  		int mdtidx;
>  
> -		rc = obd_ioctl_getdata(&buf, &len, (void __user *)arg);
> +		rc = obd_ioctl_getdata(&data, &len, (void __user *)arg);
>  		if (rc < 0)
>  			return rc;
>  
> -		data = (struct obd_ioctl_data *)buf;
>  		if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
>  		    !data->ioc_inllen1 || !data->ioc_inllen2) {
>  			rc = -EINVAL;
> @@ -1684,7 +1678,7 @@ static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  
>  		rc = ll_migrate(inode, file, mdtidx, filename, namelen - 1);
>  migrate_free:
> -		kvfree(buf);
> +		kvfree(data);
>  
>  		return rc;
>  	}
> diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
> index 8e09fdd7a96e..e2417cd5aaed 100644
> --- a/drivers/staging/lustre/lustre/llite/llite_lib.c
> +++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
> @@ -2295,7 +2295,6 @@ int ll_obd_statfs(struct inode *inode, void __user *arg)
>  {
>  	struct ll_sb_info *sbi = NULL;
>  	struct obd_export *exp;
> -	char *buf = NULL;
>  	struct obd_ioctl_data *data = NULL;
>  	u32 type;
>  	int len = 0, rc;
> @@ -2311,11 +2310,10 @@ int ll_obd_statfs(struct inode *inode, void __user *arg)
>  		goto out_statfs;
>  	}
>  
> -	rc = obd_ioctl_getdata(&buf, &len, arg);
> +	rc = obd_ioctl_getdata(&data, &len, arg);
>  	if (rc)
>  		goto out_statfs;
>  
> -	data = (void *)buf;
>  	if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
>  	    !data->ioc_pbuf1 || !data->ioc_pbuf2) {
>  		rc = -EINVAL;
> @@ -2340,11 +2338,11 @@ int ll_obd_statfs(struct inode *inode, void __user *arg)
>  		goto out_statfs;
>  	}
>  
> -	rc = obd_iocontrol(IOC_OBD_STATFS, exp, len, buf, NULL);
> +	rc = obd_iocontrol(IOC_OBD_STATFS, exp, len, data, NULL);
>  	if (rc)
>  		goto out_statfs;
>  out_statfs:
> -	kvfree(buf);
> +	kvfree(data);
>  	return rc;
>  }
>  
> diff --git a/drivers/staging/lustre/lustre/lov/lov_obd.c b/drivers/staging/lustre/lustre/lov/lov_obd.c
> index 04d0a9ed1d05..fd769c39b482 100644
> --- a/drivers/staging/lustre/lustre/lov/lov_obd.c
> +++ b/drivers/staging/lustre/lustre/lov/lov_obd.c
> @@ -1039,27 +1039,24 @@ static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
>  	case OBD_IOC_LOV_GET_CONFIG: {
>  		struct obd_ioctl_data *data;
>  		struct lov_desc *desc;
> -		char *buf = NULL;
>  		u32 *genp;
>  
>  		len = 0;
> -		if (obd_ioctl_getdata(&buf, &len, uarg))
> +		if (obd_ioctl_getdata(&data, &len, uarg))
>  			return -EINVAL;
>  
> -		data = (struct obd_ioctl_data *)buf;
> -
>  		if (sizeof(*desc) > data->ioc_inllen1) {
> -			kvfree(buf);
> +			kvfree(data);
>  			return -EINVAL;
>  		}
>  
>  		if (sizeof(uuidp->uuid) * count > data->ioc_inllen2) {
> -			kvfree(buf);
> +			kvfree(data);
>  			return -EINVAL;
>  		}
>  
>  		if (sizeof(u32) * count > data->ioc_inllen3) {
> -			kvfree(buf);
> +			kvfree(data);
>  			return -EINVAL;
>  		}
>  
> @@ -1076,9 +1073,9 @@ static int lov_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
>  			*genp = lov->lov_tgts[i]->ltd_gen;
>  		}
>  
> -		if (copy_to_user(uarg, buf, len))
> +		if (copy_to_user(uarg, data, len))
>  			rc = -EFAULT;
> -		kvfree(buf);
> +		kvfree(data);
>  		break;
>  	}
>  	case OBD_IOC_QUOTACTL: {
> diff --git a/drivers/staging/lustre/lustre/obdclass/class_obd.c b/drivers/staging/lustre/lustre/obdclass/class_obd.c
> index 2ee6b96f4830..b8fc74044fe3 100644
> --- a/drivers/staging/lustre/lustre/obdclass/class_obd.c
> +++ b/drivers/staging/lustre/lustre/obdclass/class_obd.c
> @@ -229,7 +229,7 @@ static int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
>  }
>  
>  /* buffer MUST be at least the size of obd_ioctl_hdr */
> -int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
> +int obd_ioctl_getdata(struct obd_ioctl_data **datap, int *len, void __user *arg)
>  {
>  	struct obd_ioctl_data *data;
>  	struct obd_ioctl_hdr hdr;
> @@ -261,16 +261,16 @@ int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
>  	 * obdfilter-survey is an example, which relies on ioctl. So we'd
>  	 * better avoid vmalloc on ioctl path. LU-66
>  	 */
> -	*buf = kvzalloc(hdr.ioc_len, GFP_KERNEL);
> -	if (!*buf) {
> +	data = kvzalloc(hdr.ioc_len, GFP_KERNEL);
> +	if (!data) {
>  		CERROR("Cannot allocate control buffer of len %d\n",
>  		       hdr.ioc_len);
>  		return -EINVAL;
>  	}
>  	*len = hdr.ioc_len;
> -	data = (struct obd_ioctl_data *)*buf;
> +	*datap = data;
>  
> -	if (copy_from_user(*buf, arg, hdr.ioc_len)) {
> +	if (copy_from_user(data, arg, hdr.ioc_len)) {
>  		err = -EFAULT;
>  		goto free_buf;
>  	}
> @@ -307,14 +307,13 @@ int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
>  	return 0;
>  
>  free_buf:
> -	kvfree(*buf);
> +	kvfree(data);
>  	return err;
>  }
>  EXPORT_SYMBOL(obd_ioctl_getdata);
>  
>  int class_handle_ioctl(unsigned int cmd, unsigned long arg)
>  {
> -	char *buf = NULL;
>  	struct obd_ioctl_data *data;
>  	struct libcfs_debug_ioctl_data *debug_data;
>  	struct obd_device *obd = NULL;
> @@ -329,11 +328,10 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
>  	}
>  
>  	CDEBUG(D_IOCTL, "cmd = %x\n", cmd);
> -	if (obd_ioctl_getdata(&buf, &len, (void __user *)arg)) {
> +	if (obd_ioctl_getdata(&data, &len, (void __user *)arg)) {
>  		CERROR("OBD ioctl: data error\n");
>  		return -EINVAL;
>  	}
> -	data = (struct obd_ioctl_data *)buf;
>  
>  	switch (cmd) {
>  	case OBD_IOC_PROCESS_CFG: {
> @@ -542,7 +540,7 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
>  	}
>  
>   out:
> -	kvfree(buf);
> +	kvfree(data);
>  	return err;
>  } /* class_handle_ioctl */
>  
> 
> 
>