path: root/fs/f2fs/inline.c

// SPDX-License-Identifier: GPL-2.0
/*
 * fs/f2fs/inline.c
 * Copyright (c) 2013, Intel Corporation
 * Authors: Huajun Li <huajun.li@intel.com>
 *          Haicheng Li <haicheng.li@intel.com>
 */

#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/fiemap.h>

#include "f2fs.h"
#include "node.h"
#include <trace/events/f2fs.h>

static bool support_inline_data(struct inode *inode)
{
	if (f2fs_used_in_atomic_write(inode))
		return false;
	if (!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))
		return false;
	if (i_size_read(inode) > MAX_INLINE_DATA(inode))
		return false;
	return true;
}

bool f2fs_may_inline_data(struct inode *inode)
{
	if (!support_inline_data(inode))
		return false;

	return !f2fs_post_read_required(inode);
}

static bool inode_has_blocks(struct inode *inode, struct folio *ifolio)
{
	struct f2fs_inode *ri = F2FS_INODE(ifolio);
	int i;

	if (F2FS_HAS_BLOCKS(inode))
		return true;

	for (i = 0; i < DEF_NIDS_PER_INODE; i++) {
		if (ri->i_nid[i])
			return true;
	}
	return false;
}

bool f2fs_sanity_check_inline_data(struct inode *inode, struct folio *ifolio)
{
	if (!f2fs_has_inline_data(inode))
		return false;

	if (inode_has_blocks(inode, ifolio))
		return false;

	if (!support_inline_data(inode))
		return true;

	/*
	 * used by sanity_check_inode(), when disk layout fields has not
	 * been synchronized to inmem fields.
	 */
	return (S_ISREG(inode->i_mode) &&
		(file_is_encrypt(inode) || file_is_verity(inode) ||
		(F2FS_I(inode)->i_flags & F2FS_COMPR_FL)));
}

bool f2fs_may_inline_dentry(struct inode *inode)
{
	if (!test_opt(F2FS_I_SB(inode), INLINE_DENTRY))
		return false;

	if (!S_ISDIR(inode->i_mode))
		return false;

	return true;
}

void f2fs_do_read_inline_data(struct folio *folio, struct folio *ifolio)
{
	struct inode *inode = folio->mapping->host;

	if (folio_test_uptodate(folio))
		return;

	f2fs_bug_on(F2FS_I_SB(inode), folio->index);

	folio_zero_segment(folio, MAX_INLINE_DATA(inode), folio_size(folio));

	/* Copy the whole inline data block */
	memcpy_to_folio(folio, 0, inline_data_addr(inode, ifolio),
		       MAX_INLINE_DATA(inode));
	if (!folio_test_uptodate(folio))
		folio_mark_uptodate(folio);
}

void f2fs_truncate_inline_inode(struct inode *inode, struct folio *ifolio,
		u64 from)
{
	void *addr;

	if (from >= MAX_INLINE_DATA(inode))
		return;

	addr = inline_data_addr(inode, ifolio);

	f2fs_folio_wait_writeback(ifolio, NODE, true, true);
	memset(addr + from, 0, MAX_INLINE_DATA(inode) - from);
	folio_mark_dirty(ifolio);

	if (from == 0)
		clear_inode_flag(inode, FI_DATA_EXIST);
}

int f2fs_read_inline_data(struct inode *inode, struct folio *folio)
{
	struct folio *ifolio;

	ifolio = f2fs_get_inode_folio(F2FS_I_SB(inode), inode->i_ino);
	if (IS_ERR(ifolio)) {
		folio_unlock(folio);
		return PTR_ERR(ifolio);
	}

	if (!f2fs_has_inline_data(inode)) {
		f2fs_folio_put(ifolio, true);
		return -EAGAIN;
	}

	if (folio->index)
		folio_zero_segment(folio, 0, folio_size(folio));
	else
		f2fs_do_read_inline_data(folio, ifolio);

	if (!folio_test_uptodate(folio))
		folio_mark_uptodate(folio);
	f2fs_folio_put(ifolio, true);
	folio_unlock(folio);
	return 0;
}

int f2fs_convert_inline_folio(struct dnode_of_data *dn, struct folio *folio)
{
	struct f2fs_io_info fio = {
		.sbi = F2FS_I_SB(dn->inode),
		.ino = dn->inode->i_ino,
		.type = DATA,
		.op = REQ_OP_WRITE,
		.op_flags = REQ_SYNC | REQ_PRIO,
		.folio = folio,
		.encrypted_page = NULL,
		.io_type = FS_DATA_IO,
	};
	struct node_info ni;
	int dirty, err;

	if (!f2fs_exist_data(dn->inode))
		goto clear_out;

	err = f2fs_reserve_block(dn, 0);
	if (err)
		return err;

	err = f2fs_get_node_info(fio.sbi, dn->nid, &ni, false);
	if (err) {
		f2fs_truncate_data_blocks_range(dn, 1);
		f2fs_put_dnode(dn);
		return err;
	}

	fio.version = ni.version;

	if (unlikely(dn->data_blkaddr != NEW_ADDR)) {
		f2fs_put_dnode(dn);
		set_sbi_flag(fio.sbi, SBI_NEED_FSCK