Commit 4dd6f977 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: support an ioctl to move a range of data blocks 



This patch implements moving a range of data blocks from source file to
destination file.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 91246c21

fs/f2fs/f2fs.h

+9 −0
Original line number Diff line number Diff line
@@ -268,6 +268,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal, 
#define F2FS_IOC_GARBAGE_COLLECT	_IO(F2FS_IOCTL_MAGIC, 6)

#define F2FS_IOC_WRITE_CHECKPOINT	_IO(F2FS_IOCTL_MAGIC, 7)

#define F2FS_IOC_DEFRAGMENT		_IO(F2FS_IOCTL_MAGIC, 8)

#define F2FS_IOC_MOVE_RANGE		_IOWR(F2FS_IOCTL_MAGIC, 9,	\

						struct f2fs_move_range)



#define F2FS_IOC_SET_ENCRYPTION_POLICY	FS_IOC_SET_ENCRYPTION_POLICY

#define F2FS_IOC_GET_ENCRYPTION_POLICY	FS_IOC_GET_ENCRYPTION_POLICY
@@ -297,6 +299,13 @@ struct f2fs_defragment { 
	u64 len;

};



struct f2fs_move_range {

	u32 dst_fd;		/* destination fd */

	u64 pos_in;		/* start position in src_fd */

	u64 pos_out;		/* start position in dst_fd */

	u64 len;		/* size to move */

};



/*

 * For INODE and NODE manager

 */

fs/f2fs/file.c

+132 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/mount.h>

#include <linux/pagevec.h>

#include <linux/uuid.h>

#include <linux/file.h>



#include "f2fs.h"

#include "node.h"
@@ -2068,6 +2069,133 @@ static int f2fs_ioc_defragment(struct file *filp, unsigned long arg) 
	return err;

}



static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,

			struct file *file_out, loff_t pos_out, size_t len)

{

	struct inode *src = file_inode(file_in);

	struct inode *dst = file_inode(file_out);

	struct f2fs_sb_info *sbi = F2FS_I_SB(src);

	size_t olen = len, dst_max_i_size = 0;

	size_t dst_osize;

	int ret;



	if (file_in->f_path.mnt != file_out->f_path.mnt ||

				src->i_sb != dst->i_sb)

		return -EXDEV;



	if (unlikely(f2fs_readonly(src->i_sb)))

		return -EROFS;



	if (S_ISDIR(src->i_mode) || S_ISDIR(dst->i_mode))

		return -EISDIR;



	if (f2fs_encrypted_inode(src) || f2fs_encrypted_inode(dst))

		return -EOPNOTSUPP;



	inode_lock(src);

	if (src != dst)

		inode_lock(dst);



	ret = -EINVAL;

	if (pos_in + len > src->i_size || pos_in + len < pos_in)

		goto out_unlock;

	if (len == 0)

		olen = len = src->i_size - pos_in;

	if (pos_in + len == src->i_size)

		len = ALIGN(src->i_size, F2FS_BLKSIZE) - pos_in;

	if (len == 0) {

		ret = 0;

		goto out_unlock;

	}



	dst_osize = dst->i_size;

	if (pos_out + olen > dst->i_size)

		dst_max_i_size = pos_out + olen;



	/* verify the end result is block aligned */

	if (!IS_ALIGNED(pos_in, F2FS_BLKSIZE) ||

			!IS_ALIGNED(pos_in + len, F2FS_BLKSIZE) ||

			!IS_ALIGNED(pos_out, F2FS_BLKSIZE))

		goto out_unlock;



	ret = f2fs_convert_inline_inode(src);

	if (ret)

		goto out_unlock;



	ret = f2fs_convert_inline_inode(dst);

	if (ret)

		goto out_unlock;



	/* write out all dirty pages from offset */

	ret = filemap_write_and_wait_range(src->i_mapping,

					pos_in, pos_in + len);

	if (ret)

		goto out_unlock;



	ret = filemap_write_and_wait_range(dst->i_mapping,

					pos_out, pos_out + len);

	if (ret)

		goto out_unlock;



	f2fs_balance_fs(sbi, true);

	f2fs_lock_op(sbi);

	ret = __exchange_data_block(src, dst, pos_in,

				pos_out, len >> F2FS_BLKSIZE_BITS, false);



	if (!ret) {

		if (dst_max_i_size)

			f2fs_i_size_write(dst, dst_max_i_size);

		else if (dst_osize != dst->i_size)

			f2fs_i_size_write(dst, dst_osize);

	}

	f2fs_unlock_op(sbi);

out_unlock:

	if (src != dst)

		inode_unlock(dst);

	inode_unlock(src);

	return ret;

}



static int f2fs_ioc_move_range(struct file *filp, unsigned long arg)

{

	struct f2fs_move_range range;

	struct fd dst;

	int err;



	if (!(filp->f_mode & FMODE_READ) ||

			!(filp->f_mode & FMODE_WRITE))

		return -EBADF;



	if (copy_from_user(&range, (struct f2fs_move_range __user *)arg,

							sizeof(range)))

		return -EFAULT;



	dst = fdget(range.dst_fd);

	if (!dst.file)

		return -EBADF;



	if (!(dst.file->f_mode & FMODE_WRITE)) {

		err = -EBADF;

		goto err_out;

	}



	err = mnt_want_write_file(filp);

	if (err)

		goto err_out;



	err = f2fs_move_file_range(filp, range.pos_in, dst.file,

					range.pos_out, range.len);



	mnt_drop_write_file(filp);



	if (copy_to_user((struct f2fs_move_range __user *)arg,

						&range, sizeof(range)))

		err = -EFAULT;

err_out:

	fdput(dst);

	return err;

}



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

{

	switch (cmd) {
@@ -2103,6 +2231,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 
		return f2fs_ioc_write_checkpoint(filp, arg);

	case F2FS_IOC_DEFRAGMENT:

		return f2fs_ioc_defragment(filp, arg);

	case F2FS_IOC_MOVE_RANGE:

		return f2fs_ioc_move_range(filp, arg);

	default:

		return -ENOTTY;

	}
@@ -2163,6 +2293,8 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 
	case F2FS_IOC_WRITE_CHECKPOINT:

	case F2FS_IOC_DEFRAGMENT:

		break;

	case F2FS_IOC_MOVE_RANGE:

		break;

	default:

		return -ENOIOCTLCMD;

	}