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From:   Daeho Jeong <daeho43@gmail.com>
To:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com
Cc:     Daeho Jeong <daehojeong@google.com>
Subject: [PATCH 2/2] f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE
Date:   Mon, 23 Nov 2020 12:17:51 +0900
Message-Id: <20201123031751.36811-2-daeho43@gmail.com>
In-Reply-To: <20201123031751.36811-1-daeho43@gmail.com>
References: <20201123031751.36811-1-daeho43@gmail.com>
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From: Daeho Jeong <daehojeong@google.com>

Added two ioctl to decompress/compress explicitly the compression
enabled file in "compress_mode=user-based" mount option.

Using these two ioctls, the users can make a control of compression
and decompression of their files.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
 fs/f2fs/file.c            | 181 +++++++++++++++++++++++++++++++++++++-
 include/uapi/linux/f2fs.h |   2 +
 2 files changed, 182 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index be8db06aca27..e8f142470e87 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4026,6 +4026,180 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
 	return ret;
 }
 
+static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len)
+{
+	DEFINE_READAHEAD(ractl, NULL, inode->i_mapping, page_idx);
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct address_space *mapping = inode->i_mapping;
+	struct page *page;
+	pgoff_t redirty_idx = page_idx;
+	int i, page_len = 0, ret = 0;
+
+	page_cache_ra_unbounded(&ractl, len, 0);
+
+	for (i = 0; i < len; i++, page_idx++) {
+		page = read_cache_page(mapping, page_idx, NULL, NULL);
+		if (IS_ERR(page)) {
+			ret = PTR_ERR(page);
+			f2fs_warn(sbi, "%s: inode (%lu) : page_index (%lu) "
+				"couldn't be read (errno:%d).\n",
+				__func__, inode->i_ino, page_idx, ret);
+			break;
+		}
+		page_len++;
+	}
+
+	for (i = 0; i < page_len; i++, redirty_idx++) {
+		page = find_lock_page(mapping, redirty_idx);
+		if (!page) {
+			ret = -ENOENT;
+			f2fs_warn(sbi, "%s: inode (%lu) : page_index (%lu) "
+				"couldn't be found (errno:%d).\n",
+				__func__, inode->i_ino, redirty_idx, ret);
+		}
+		set_page_dirty(page);
+		f2fs_put_page(page, 1);
+		f2fs_put_page(page, 0);
+	}
+
+	return ret;
+}
+
+static int f2fs_ioc_decompress_file(struct file *filp, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct f2fs_inode_info *fi = F2FS_I(inode);
+	pgoff_t page_idx = 0, last_idx;
+	int cluster_size = F2FS_I(inode)->i_cluster_size;
+	int count, ret;
+
+	if (!f2fs_sb_has_compression(sbi))
+		return -EOPNOTSUPP;
+
+	if (!(filp->f_mode & FMODE_WRITE))
+		return -EBADF;
+
+	if (!f2fs_compressed_file(inode))
+		return -EINVAL;
+
+	f2fs_balance_fs(F2FS_I_SB(inode), true);
+
+	file_start_write(filp);
+	inode_lock(inode);
+
+	if (f2fs_is_mmap_file(inode)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
+	if (ret)
+		goto out;
+
+	if (!atomic_read(&fi->i_compr_blocks))
+		goto out;
+
+	last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+
+	count = last_idx - page_idx;
+	while (count) {
+		int len = min(cluster_size, count);
+
+		ret = redirty_blocks(inode, page_idx, len);
+
+		if (ret < 0)
+			break;
+
+		page_idx += len;
+		count -= len;
+	}
+
+	if (!ret)
+		ret = filemap_write_and_wait_range(inode->i_mapping, 0,
+							LLONG_MAX);
+
+	if (!ret) {
+		stat_sub_compr_blocks(inode, atomic_read(&fi->i_compr_blocks));
+		atomic_set(&fi->i_compr_blocks, 0);
+		f2fs_mark_inode_dirty_sync(inode, true);
+	} else {
+		f2fs_warn(sbi, "%s: The file might be partially decompressed "
+				"(errno=%d). Please delete the file.\n",
+				__func__, ret);
+	}
+out:
+	inode_unlock(inode);
+	file_end_write(filp);
+
+	return ret;
+}
+
+static int f2fs_ioc_compress_file(struct file *filp, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	pgoff_t page_idx = 0, last_idx;
+	int cluster_size = F2FS_I(inode)->i_cluster_size;
+	int count, ret;
+
+	if (!f2fs_sb_has_compression(sbi))
+		return -EOPNOTSUPP;
+
+	if (!(filp->f_mode & FMODE_WRITE))
+		return -EBADF;
+
+	if (!f2fs_compressed_file(inode))
+		return -EINVAL;
+
+	f2fs_balance_fs(F2FS_I_SB(inode), true);
+
+	file_start_write(filp);
+	inode_lock(inode);
+
+	if (f2fs_is_mmap_file(inode)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
+	if (ret)
+		goto out;
+
+	set_inode_flag(inode, FI_ENABLE_COMPRESS);
+
+	last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+
+	count = last_idx - page_idx;
+	while (count) {
+		int len = min(cluster_size, count);
+
+		ret = redirty_blocks(inode, page_idx, len);
+
+		if (ret < 0)
+			break;
+
+		page_idx += len;
+		count -= len;
+	}
+
+	if (!ret)
+		ret = filemap_write_and_wait_range(inode->i_mapping, 0,
+							LLONG_MAX);
+
+	clear_inode_flag(inode, FI_ENABLE_COMPRESS);
+
+	if (ret)
+		f2fs_warn(sbi, "%s: The file might be partially compressed "
+				"(errno=%d). Please delete the file.\n",
+				__func__, ret);
+out:
+	inode_unlock(inode);
+	file_end_write(filp);
+
+	return ret;
+}
+
 static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	switch (cmd) {
@@ -4113,6 +4287,10 @@ static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return f2fs_ioc_get_compress_option(filp, arg);
 	case F2FS_IOC_SET_COMPRESS_OPTION:
 		return f2fs_ioc_set_compress_option(filp, arg);
+	case F2FS_IOC_DECOMPRESS_FILE:
+		return f2fs_ioc_decompress_file(filp, arg);
+	case F2FS_IOC_COMPRESS_FILE:
+		return f2fs_ioc_compress_file(filp, arg);
 	default:
 		return -ENOTTY;
 	}
@@ -4352,7 +4530,8 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case F2FS_IOC_SEC_TRIM_FILE:
 	case F2FS_IOC_GET_COMPRESS_OPTION:
 	case F2FS_IOC_SET_COMPRESS_OPTION:
-		break;
+	case F2FS_IOC_DECOMPRESS_FILE:
+	case F2FS_IOC_COMPRESS_FILE:
 	default:
 		return -ENOIOCTLCMD;
 	}
diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h
index f00199a2e38b..352a822d4370 100644
--- a/include/uapi/linux/f2fs.h
+++ b/include/uapi/linux/f2fs.h
@@ -40,6 +40,8 @@
 						struct f2fs_comp_option)
 #define F2FS_IOC_SET_COMPRESS_OPTION	_IOW(F2FS_IOCTL_MAGIC, 22,	\
 						struct f2fs_comp_option)
+#define F2FS_IOC_DECOMPRESS_FILE	_IO(F2FS_IOCTL_MAGIC, 23)
+#define F2FS_IOC_COMPRESS_FILE		_IO(F2FS_IOCTL_MAGIC, 24)
 
 /*
  * should be same as XFS_IOC_GOINGDOWN.
-- 
2.29.2.454.gaff20da3a2-goog