f2fs: introduce F2FS_IOC_GET_COMPRESS_BLOCKS

With this newly introduced interface, user can get block
number compression saved in target inode.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 14f7af37ff4bb0a8823e00f3716eb5d82c503402..60e9da1c1c0a69cb1c21257fa9b441e8d85dc625 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -426,6 +426,7 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
 #define F2FS_IOC_GET_PIN_FILE          _IOR(F2FS_IOCTL_MAGIC, 14, __u32)
 #define F2FS_IOC_PRECACHE_EXTENTS      _IO(F2FS_IOCTL_MAGIC, 15)
 #define F2FS_IOC_RESIZE_FS             _IOW(F2FS_IOCTL_MAGIC, 16, __u64)
+#define F2FS_IOC_GET_COMPRESS_BLOCKS   _IOR(F2FS_IOCTL_MAGIC, 17, __u64)
 
 #define F2FS_IOC_GET_VOLUME_NAME       FS_IOC_GETFSLABEL
 #define F2FS_IOC_SET_VOLUME_NAME       FS_IOC_SETFSLABEL

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index b318e4d9f825129b57e5653c371c64285c835997..9abd6cfe3e5ad706f094528a61333b04652212bf 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3398,6 +3398,21 @@ out:
        return err;
 }
 
+static int f2fs_get_compress_blocks(struct file *filp, unsigned long arg)
+{
+       struct inode *inode = file_inode(filp);
+       __u64 blocks;
+
+       if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
+               return -EOPNOTSUPP;
+
+       if (!f2fs_compressed_file(inode))
+               return -EINVAL;
+
+       blocks = F2FS_I(inode)->i_compr_blocks;
+       return put_user(blocks, (u64 __user *)arg);
+}
+
 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
        if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
@@ -3476,6 +3491,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                return f2fs_get_volume_name(filp, arg);
        case F2FS_IOC_SET_VOLUME_NAME:
                return f2fs_set_volume_name(filp, arg);
+       case F2FS_IOC_GET_COMPRESS_BLOCKS:
+               return f2fs_get_compress_blocks(filp, arg);
        default:
                return -ENOTTY;
        }
@@ -3633,6 +3650,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        case FS_IOC_MEASURE_VERITY:
        case F2FS_IOC_GET_VOLUME_NAME:
        case F2FS_IOC_SET_VOLUME_NAME:
+       case F2FS_IOC_GET_COMPRESS_BLOCKS:
                break;
        default:
                return -ENOIOCTLCMD;