Commit e1e8debe authored by Daeho Jeong's avatar Daeho Jeong Committed by Jaegeuk Kim
Browse files

f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl 



Added a new F2FS_IOC_SET_COMPRESS_OPTION ioctl to change file
compression option of a file.

struct f2fs_comp_option {
    u8 algorithm;         => compression algorithm
                          => 0:lzo, 1:lz4, 2:zstd, 3:lzorle
    u8 log_cluster_size;  => log scale cluster size
                          => 2 ~ 8
};

struct f2fs_comp_option option;

option.algorithm = 1;
option.log_cluster_size = 7;

ioctl(fd, F2FS_IOC_SET_COMPRESS_OPTION, &option);

Signed-off-by: default avatarDaeho Jeong <daehojeong@google.com>
[Chao Yu: remove f2fs_is_compress_algorithm_valid()]
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 9e2a5f8c

fs/f2fs/file.c

+54 −0
Original line number Diff line number Diff line
@@ -3972,6 +3972,57 @@ static int f2fs_ioc_get_compress_option(struct file *filp, unsigned long arg) 
	return 0;

}



static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	struct f2fs_comp_option option;

	int ret = 0;



	if (!f2fs_sb_has_compression(sbi))

		return -EOPNOTSUPP;



	if (!(filp->f_mode & FMODE_WRITE))

		return -EBADF;



	if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,

				sizeof(option)))

		return -EFAULT;



	if (!f2fs_compressed_file(inode) ||

			option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||

			option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||

			option.algorithm >= COMPRESS_MAX)

		return -EINVAL;



	file_start_write(filp);

	inode_lock(inode);



	if (f2fs_is_mmap_file(inode) || get_dirty_pages(inode)) {

		ret = -EBUSY;

		goto out;

	}



	if (inode->i_size != 0) {

		ret = -EFBIG;

		goto out;

	}



	F2FS_I(inode)->i_compress_algorithm = option.algorithm;

	F2FS_I(inode)->i_log_cluster_size = option.log_cluster_size;

	F2FS_I(inode)->i_cluster_size = 1 << option.log_cluster_size;

	f2fs_mark_inode_dirty_sync(inode, true);



	if (!f2fs_is_compress_backend_ready(inode))

		f2fs_warn(sbi, "compression algorithm is successfully set, "

			"but current kernel doesn't support this algorithm.");

out:

	inode_unlock(inode);

	file_end_write(filp);



	return ret;

}



long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
@@ -4062,6 +4113,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 
		return f2fs_sec_trim_file(filp, arg);

	case F2FS_IOC_GET_COMPRESS_OPTION:

		return f2fs_ioc_get_compress_option(filp, arg);

	case F2FS_IOC_SET_COMPRESS_OPTION:

		return f2fs_ioc_set_compress_option(filp, arg);

	default:

		return -ENOTTY;

	}
@@ -4233,6 +4286,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 
	case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:

	case F2FS_IOC_SEC_TRIM_FILE:

	case F2FS_IOC_GET_COMPRESS_OPTION:

	case F2FS_IOC_SET_COMPRESS_OPTION:

		break;

	default:

		return -ENOIOCTLCMD;

include/uapi/linux/f2fs.h

+2 −0
Original line number Diff line number Diff line
@@ -38,6 +38,8 @@ 
						struct f2fs_sectrim_range)

#define F2FS_IOC_GET_COMPRESS_OPTION	_IOR(F2FS_IOCTL_MAGIC, 21,	\

						struct f2fs_comp_option)

#define F2FS_IOC_SET_COMPRESS_OPTION	_IOW(F2FS_IOCTL_MAGIC, 22,	\

						struct f2fs_comp_option)



/*

 * should be same as XFS_IOC_GOINGDOWN.

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