Re: [f2fs-dev] [PATCH] f2fs: export pin_file flag to user

[Chao Yu <yuchao0@huawei.com>]

On 2019/1/4 12:19, Jaegeuk Kim wrote:
> This exports pin_file status to user.

Semantics of pin_file flag is the same as nocow flag which is more widely
used in lsattr/chattr and vfs now.

#define FS_NOCOW_FL                     0x00800000 /* Do not cow file */

lsattr/chattr
no copy on write (C)

How about exporting it via F2FS_NOCOW_FL(0x00800000)?

Thanks,

> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
>  fs/f2fs/f2fs.h | 3 ++-
>  fs/f2fs/file.c | 2 ++
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 12fabd6735dd..036fd62010c1 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -2303,9 +2303,10 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr)
>  #define F2FS_EOFBLOCKS_FL		0x00400000 /* Blocks allocated beyond EOF */
>  #define F2FS_INLINE_DATA_FL		0x10000000 /* Inode has inline data. */
>  #define F2FS_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
> +#define F2FS_PIN_FILE_FL		0x40000000 /* pin_file status */
>  #define F2FS_RESERVED_FL		0x80000000 /* reserved for ext4 lib */
>  
> -#define F2FS_FL_USER_VISIBLE		0x304BDFFF /* User visible flags */
> +#define F2FS_FL_USER_VISIBLE		0x704BDFFF /* User visible flags */
>  #define F2FS_FL_USER_MODIFIABLE		0x204BC0FF /* User modifiable flags */
>  
>  /* Flags we can manipulate with through F2FS_IOC_FSSETXATTR */
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index ae2b45e75847..eb099f1ee937 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1651,6 +1651,8 @@ static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
>  		flags |= F2FS_ENCRYPT_FL;
>  	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode))
>  		flags |= F2FS_INLINE_DATA_FL;
> +	if (is_inode_flag_set(inode, FI_PIN_FILE))
> +		flags |= F2FS_PIN_FILE_FL;
>  
>  	flags &= F2FS_FL_USER_VISIBLE;
>  
>