[PATCH 3/5] f2fs: support copy_file_range

Jaegeuk Kim
2016-07-15T00:47:12Z

This patch implements copy_file_range in f2fs.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/file.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index dd399b3..c529884 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2201,6 +2201,72 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
return ret;
}

+ssize_t f2fs_copy_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ size_t len, unsigned int flags)
+{
+ 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 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;
+
+ 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;
+ }
+ 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;
+
+ f2fs_balance_fs(sbi, true);
+ f2fs_lock_op(sbi);
+ ret = __exchange_data_block(src, dst, pos_in, pos_out, len, false);
+ if (!ret && dst->i_size > dst_max_i_size)
+ f2fs_i_size_write(dst, dst_max_i_size);
+ f2fs_unlock_op(sbi);
+out_unlock:
+ if (src != dst)
+ inode_unlock(dst);
+ inode_unlock(src);
+ if (!ret)
+ ret = olen;
+ return ret;
+}
+
#ifdef CONFIG_COMPAT
long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
@@ -2247,6 +2313,7 @@ const struct file_operations f2fs_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = f2fs_compat_ioctl,
#endif
+ .copy_file_range = f2fs_copy_file_range,
.splice_read = generic_file_splice_read,
.splice_write = iter_file_splice_write,
};
--
2.8.3