From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim Subject: [PATCH 2/3] f2fs: support copy_file_range Date: Sat, 16 Jul 2016 23:24:26 -0700 Message-Id: <20160717062427.56718-2-jaegeuk@kernel.org> In-Reply-To: <20160717062427.56718-1-jaegeuk@kernel.org> References: <20160717062427.56718-1-jaegeuk@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: This patch implements copy_file_range in f2fs. Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 3573b07..c2b7e35 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -2215,6 +2215,103 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) return ret; } +static int f2fs_clone_files(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; + + 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; +} + +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) +{ + ssize_t ret; + + ret = f2fs_clone_files(file_in, pos_in, file_out, pos_out, len); + if (!ret) + ret = len; + return ret; +} + #ifdef CONFIG_COMPAT long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -2261,6 +2358,7 @@ 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