linux-kernel - Re: [PATCH] btrfs: ioctl: Try to use btrfs_fs

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Date:   Fri, 11 Oct 2019 09:38:09 +0300
From:   Nikolay Borisov <nborisov@...e.com>
To:     Marcos Paulo de Souza <marcos.souza.org@...il.com>, clm@...com,
        David Sterba <dsterba@...e.com>
Cc:     Marcos Paulo de Souza <mpdesouza@...e.com>,
        Josef Bacik <josef@...icpanda.com>,
        "open list:BTRFS FILE SYSTEM" <linux-btrfs@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] btrfs: ioctl: Try to use btrfs_fs_info instead of *file



On 11.10.19 г. 3:23 ч., Marcos Paulo de Souza wrote:
> Some functions are doing some bikeshedding to reach the btrfs_fs_info
> struct. Change these functions to receive a btrfs_fs_info struct instead
> of a *file.
> 
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@...e.com>

Changes seems pretty self-explanatory so :

Reviewed-by: Nikolay Borisov <nborisov@...e.com>

> ---
>  The kernel survived btrfs-progs tests with this patch applied.
> 
>  fs/btrfs/ioctl.c | 36 +++++++++++++++---------------------
>  1 file changed, 15 insertions(+), 21 deletions(-)
> 
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index de730e56d3f5..870e5c48b362 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -479,10 +479,9 @@ static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
>  	return put_user(inode->i_generation, arg);
>  }
>  
> -static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
> +static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
> +					void __user *arg)
>  {
> -	struct inode *inode = file_inode(file);
> -	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
>  	struct btrfs_device *device;
>  	struct request_queue *q;
>  	struct fstrim_range range;
> @@ -4960,10 +4959,9 @@ static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
>  	return ret;
>  }
>  
> -static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
> +static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
> +						void __user *arg)
>  {
> -	struct inode *inode = file_inode(file);
> -	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
>  	struct btrfs_ioctl_quota_rescan_args *qsa;
>  	int ret = 0;
>  
> @@ -4986,11 +4984,9 @@ static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
>  	return ret;
>  }
>  
> -static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
> +static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
> +						void __user *arg)
>  {
> -	struct inode *inode = file_inode(file);
> -	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
> -
>  	if (!capable(CAP_SYS_ADMIN))
>  		return -EPERM;
>  
> @@ -5162,10 +5158,9 @@ static long btrfs_ioctl_set_received_subvol(struct file *file,
>  	return ret;
>  }
>  
> -static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
> +static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info *fs_info,
> +					void __user *arg)
>  {
> -	struct inode *inode = file_inode(file);
> -	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
>  	size_t len;
>  	int ret;
>  	char label[BTRFS_LABEL_SIZE];
> @@ -5249,10 +5244,9 @@ int btrfs_ioctl_get_supported_features(void __user *arg)
>  	return 0;
>  }
>  
> -static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
> +static int btrfs_ioctl_get_features(struct btrfs_fs_info *fs_info,
> +					void __user *arg)
>  {
> -	struct inode *inode = file_inode(file);
> -	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
>  	struct btrfs_super_block *super_block = fs_info->super_copy;
>  	struct btrfs_ioctl_feature_flags features;
>  
> @@ -5453,11 +5447,11 @@ long btrfs_ioctl(struct file *file, unsigned int
>  	case FS_IOC_GETVERSION:
>  		return btrfs_ioctl_getversion(file, argp);
>  	case FS_IOC_GETFSLABEL:
> -		return btrfs_ioctl_get_fslabel(file, argp);
> +		return btrfs_ioctl_get_fslabel(fs_info, argp);
>  	case FS_IOC_SETFSLABEL:
>  		return btrfs_ioctl_set_fslabel(file, argp);
>  	case FITRIM:
> -		return btrfs_ioctl_fitrim(file, argp);
> +		return btrfs_ioctl_fitrim(fs_info, argp);
>  	case BTRFS_IOC_SNAP_CREATE:
>  		return btrfs_ioctl_snap_create(file, argp, 0);
>  	case BTRFS_IOC_SNAP_CREATE_V2:
> @@ -5562,15 +5556,15 @@ long btrfs_ioctl(struct file *file, unsigned int
>  	case BTRFS_IOC_QUOTA_RESCAN:
>  		return btrfs_ioctl_quota_rescan(file, argp);
>  	case BTRFS_IOC_QUOTA_RESCAN_STATUS:
> -		return btrfs_ioctl_quota_rescan_status(file, argp);
> +		return btrfs_ioctl_quota_rescan_status(fs_info, argp);
>  	case BTRFS_IOC_QUOTA_RESCAN_WAIT:
> -		return btrfs_ioctl_quota_rescan_wait(file, argp);
> +		return btrfs_ioctl_quota_rescan_wait(fs_info, argp);
>  	case BTRFS_IOC_DEV_REPLACE:
>  		return btrfs_ioctl_dev_replace(fs_info, argp);
>  	case BTRFS_IOC_GET_SUPPORTED_FEATURES:
>  		return btrfs_ioctl_get_supported_features(argp);
>  	case BTRFS_IOC_GET_FEATURES:
> -		return btrfs_ioctl_get_features(file, argp);
> +		return btrfs_ioctl_get_features(fs_info, argp);
>  	case BTRFS_IOC_SET_FEATURES:
>  		return btrfs_ioctl_set_features(file, argp);
>  	case FS_IOC_FSGETXATTR:
>