fs/f2fs/inline.c - kernel/msm-4.9 - Gitiles

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

 bool f2fs_may_inline_data(struct inode *inode)
 {
 	if (f2fs_is_atomic_file(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;

 	if (f2fs_post_read_required(inode))
 		return false;

 	return true;
 }

 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 page *page, struct page *ipage)
 {
 	struct inode *inode = page->mapping->host;
 	void *src_addr, *dst_addr;

 	if (PageUptodate(page))
 		return;

 	f2fs_bug_on(F2FS_P_SB(page), page->index);

 	zero_user_segment(page, MAX_INLINE_DATA(inode), PAGE_SIZE);

 	/* Copy the whole inline data block */
 	src_addr = inline_data_addr(inode, ipage);
 	dst_addr = kmap_atomic(page);
 	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
 	flush_dcache_page(page);
 	kunmap_atomic(dst_addr);
 	if (!PageUptodate(page))
 		SetPageUptodate(page);
 }

 void f2fs_truncate_inline_inode(struct inode *inode,
 					struct page *ipage, u64 from)
 {
 	void *addr;

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

 	addr = inline_data_addr(inode, ipage);

 	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
 	memset(addr + from, 0, MAX_INLINE_DATA(inode) - from);
 	set_page_dirty(ipage);

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

 int f2fs_read_inline_data(struct inode *inode, struct page *page)
 {
 	struct page *ipage;

 	if (trace_android_fs_dataread_start_enabled()) {
 		char *path, pathbuf[MAX_TRACE_PATHBUF_LEN];

 		path = android_fstrace_get_pathname(pathbuf,
 						    MAX_TRACE_PATHBUF_LEN,
 						    inode);
 		trace_android_fs_dataread_start(inode, page_offset(page),
 						PAGE_SIZE, current->pid,
 						path, current->comm);
 	}

 	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
 	if (IS_ERR(ipage)) {
 		trace_android_fs_dataread_end(inode, page_offset(page),
 					      PAGE_SIZE);
 		unlock_page(page);
 		return PTR_ERR(ipage);
 	}

 	if (!f2fs_has_inline_data(inode)) {
 		f2fs_put_page(ipage, 1);
 		trace_android_fs_dataread_end(inode, page_offset(page),
 					      PAGE_SIZE);
 		return -EAGAIN;
 	}

 	if (page->index)
 		zero_user_segment(page, 0, PAGE_SIZE);
 	else
 		f2fs_do_read_inline_data(page, ipage);

 	if (!PageUptodate(page))
 		SetPageUptodate(page);
 	f2fs_put_page(ipage, 1);
 	trace_android_fs_dataread_end(inode, page_offset(page),
 				      PAGE_SIZE);
 	unlock_page(page);
 	return 0;
 }

 int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 {
 	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,
 		.page = page,
 		.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);
 	if (err) {
 		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);
 		f2fs_msg(fio.sbi->sb, KERN_WARNING,
 			"%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, "
 			"run fsck to fix.",
 			__func__, dn->inode->i_ino, dn->data_blkaddr);
 		return -EINVAL;
 	}

 	f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));

 	f2fs_do_read_inline_data(page, dn->inode_page);
 	set_page_dirty(page);

 	/* clear dirty state */
 	dirty = clear_page_dirty_for_io(page);

 	/* write data page to try to make data consistent */
 	set_page_writeback(page);
 	ClearPageError(page);
 	fio.old_blkaddr = dn->data_blkaddr;
 	set_inode_flag(dn->inode, FI_HOT_DATA);
 	f2fs_outplace_write_data(dn, &fio);
 	f2fs_wait_on_page_writeback(page, DATA, true, true);
 	if (dirty) {
 		inode_dec_dirty_pages(dn->inode);
 		f2fs_remove_dirty_inode(dn->inode);
 	}

 	/* this converted inline_data should be recovered. */
 	set_inode_flag(dn->inode, FI_APPEND_WRITE);

 	/* clear inline data and flag after data writeback */
 	f2fs_truncate_inline_inode(dn->inode, dn->inode_page, 0);
 	clear_inline_node(dn->inode_page);
 clear_out:
 	stat_dec_inline_inode(dn->inode);
 	clear_inode_flag(dn->inode, FI_INLINE_DATA);
 	f2fs_put_dnode(dn);
 	return 0;
 }

 int f2fs_convert_inline_inode(struct inode *inode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct dnode_of_data dn;
 	struct page *ipage, *page;
 	int err = 0;

 	if (!f2fs_has_inline_data(inode))
 		return 0;

 	page = f2fs_grab_cache_page(inode->i_mapping, 0, false);
 	if (!page)
 		return -ENOMEM;

 	f2fs_lock_op(sbi);

 	ipage = f2fs_get_node_page(sbi, inode->i_ino);
 	if (IS_ERR(ipage)) {
 		err = PTR_ERR(ipage);
 		goto out;
 	}

 	set_new_dnode(&dn, inode, ipage, ipage, 0);

 	if (f2fs_has_inline_data(inode))
 		err = f2fs_convert_inline_page(&dn, page);

 	f2fs_put_dnode(&dn);
 out:
 	f2fs_unlock_op(sbi);

 	f2fs_put_page(page, 1);

 	f2fs_balance_fs(sbi, dn.node_changed);

 	return err;
 }

 int f2fs_write_inline_data(struct inode *inode, struct page *page)
 {
 	void *src_addr, *dst_addr;
 	struct dnode_of_data dn;
 	int err;

 	set_new_dnode(&dn, inode, NULL, NULL, 0);
 	err = f2fs_get_dnode_of_data(&dn, 0, LOOKUP_NODE);
 	if (err)
 		return err;

 	if (!f2fs_has_inline_data(inode)) {
 		f2fs_put_dnode(&dn);
 		return -EAGAIN;
 	}

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

 	f2fs_wait_on_page_writeback(dn.inode_page, NODE, true, true);
 	src_addr = kmap_atomic(page);
 	dst_addr = inline_data_addr(inode, dn.inode_page);
 	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
 	kunmap_atomic(src_addr);
 	set_page_dirty(dn.inode_page);

 	f2fs_clear_radix_tree_dirty_tag(page);

 	set_inode_flag(inode, FI_APPEND_WRITE);
 	set_inode_flag(inode, FI_DATA_EXIST);

 	clear_inline_node(dn.inode_page);
 	f2fs_put_dnode(&dn);
 	return 0;
 }

 bool f2fs_recover_inline_data(struct inode *inode, struct page *npage)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct f2fs_inode *ri = NULL;
 	void *src_addr, *dst_addr;
 	struct page *ipage;

 	/*
 	 * The inline_data recovery policy is as follows.
 	 * [prev.] [next] of inline_data flag
 	 *    o       o  -> recover inline_data
 	 *    o       x  -> remove inline_data, and then recover data blocks
 	 *    x       o  -> remove inline_data, and then recover inline_data
 	 *    x       x  -> recover data blocks
 	 */
 	if (IS_INODE(npage))
 		ri = F2FS_INODE(npage);

 	if (f2fs_has_inline_data(inode) &&
 			ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 process_inline:
 		ipage = f2fs_get_node_page(sbi, inode->i_ino);
 		f2fs_bug_on(sbi, IS_ERR(ipage));

 		f2fs_wait_on_page_writeback(ipage, NODE, true, true);

 		src_addr = inline_data_addr(inode, npage);
 		dst_addr = inline_data_addr(inode, ipage);
 		memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));

 		set_inode_flag(inode, FI_INLINE_DATA);
 		set_inode_flag(inode, FI_DATA_EXIST);

 		set_page_dirty(ipage);
 		f2fs_put_page(ipage, 1);
 		return true;
 	}

 	if (f2fs_has_inline_data(inode)) {
 		ipage = f2fs_get_node_page(sbi, inode->i_ino);
 		f2fs_bug_on(sbi, IS_ERR(ipage));
 		f2fs_truncate_inline_inode(inode, ipage, 0);
 		clear_inode_flag(inode, FI_INLINE_DATA);
 		f2fs_put_page(ipage, 1);
 	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
 		if (f2fs_truncate_blocks(inode, 0, false))
 			return false;
 		goto process_inline;
 	}
 	return false;
 }

 struct f2fs_dir_entry *f2fs_find_in_inline_dir(struct inode *dir,
 			struct fscrypt_name *fname, struct page **res_page)
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 	struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
 	struct f2fs_dir_entry *de;
 	struct f2fs_dentry_ptr d;
 	struct page *ipage;
 	void *inline_dentry;
 	f2fs_hash_t namehash;

 	ipage = f2fs_get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage)) {
 		*res_page = ipage;
 		return NULL;
 	}

 	namehash = f2fs_dentry_hash(&name, fname);

 	inline_dentry = inline_data_addr(dir, ipage);

 	make_dentry_ptr_inline(dir, &d, inline_dentry);
 	de = f2fs_find_target_dentry(fname, namehash, NULL, &d);
 	unlock_page(ipage);
 	if (de)
 		*res_page = ipage;
 	else
 		f2fs_put_page(ipage, 0);

 	return de;
 }

 int f2fs_make_empty_inline_dir(struct inode *inode, struct inode *parent,
 							struct page *ipage)
 {
 	struct f2fs_dentry_ptr d;
 	void *inline_dentry;

 	inline_dentry = inline_data_addr(inode, ipage);

 	make_dentry_ptr_inline(inode, &d, inline_dentry);
 	f2fs_do_make_empty_dir(inode, parent, &d);

 	set_page_dirty(ipage);

 	/* update i_size to MAX_INLINE_DATA */
 	if (i_size_read(inode) < MAX_INLINE_DATA(inode))
 		f2fs_i_size_write(inode, MAX_INLINE_DATA(inode));
 	return 0;
 }

 /*
  * NOTE: ipage is grabbed by caller, but if any error occurs, we should
  * release ipage in this function.
  */
 static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
 							void *inline_dentry)
 {
 	struct page *page;
 	struct dnode_of_data dn;
 	struct f2fs_dentry_block *dentry_blk;
 	struct f2fs_dentry_ptr src, dst;
 	int err;

 	page = f2fs_grab_cache_page(dir->i_mapping, 0, false);
 	if (!page) {
 		f2fs_put_page(ipage, 1);
 		return -ENOMEM;
 	}

 	set_new_dnode(&dn, dir, ipage, NULL, 0);
 	err = f2fs_reserve_block(&dn, 0);
 	if (err)
 		goto out;

 	if (unlikely(dn.data_blkaddr != NEW_ADDR)) {
 		f2fs_put_dnode(&dn);
 		set_sbi_flag(F2FS_P_SB(page), SBI_NEED_FSCK);
 		f2fs_msg(F2FS_P_SB(page)->sb, KERN_WARNING,
 			"%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, "
 			"run fsck to fix.",
 			__func__, dir->i_ino, dn.data_blkaddr);
 		err = -EINVAL;
 		goto out;
 	}

 	f2fs_wait_on_page_writeback(page, DATA, true, true);

 	dentry_blk = page_address(page);

 	make_dentry_ptr_inline(dir, &src, inline_dentry);
 	make_dentry_ptr_block(dir, &dst, dentry_blk);

 	/* copy data from inline dentry block to new dentry block */
 	memcpy(dst.bitmap, src.bitmap, src.nr_bitmap);
 	memset(dst.bitmap + src.nr_bitmap, 0, dst.nr_bitmap - src.nr_bitmap);
 	/*
 	 * we do not need to zero out remainder part of dentry and filename
 	 * field, since we have used bitmap for marking the usage status of
 	 * them, besides, we can also ignore copying/zeroing reserved space
 	 * of dentry block, because them haven't been used so far.
 	 */
 	memcpy(dst.dentry, src.dentry, SIZE_OF_DIR_ENTRY * src.max);
 	memcpy(dst.filename, src.filename, src.max * F2FS_SLOT_LEN);

 	if (!PageUptodate(page))
 		SetPageUptodate(page);
 	set_page_dirty(page);

 	/* clear inline dir and flag after data writeback */
 	f2fs_truncate_inline_inode(dir, ipage, 0);

 	stat_dec_inline_dir(dir);
 	clear_inode_flag(dir, FI_INLINE_DENTRY);

 	f2fs_i_depth_write(dir, 1);
 	if (i_size_read(dir) < PAGE_SIZE)
 		f2fs_i_size_write(dir, PAGE_SIZE);
 out:
 	f2fs_put_page(page, 1);
 	return err;
 }

 static int f2fs_add_inline_entries(struct inode *dir, void *inline_dentry)
 {
 	struct f2fs_dentry_ptr d;
 	unsigned long bit_pos = 0;
 	int err = 0;

 	make_dentry_ptr_inline(dir, &d, inline_dentry);

 	while (bit_pos < d.max) {
 		struct f2fs_dir_entry *de;
 		struct qstr new_name;
 		nid_t ino;
 		umode_t fake_mode;

 		if (!test_bit_le(bit_pos, d.bitmap)) {
 			bit_pos++;
 			continue;
 		}

 		de = &d.dentry[bit_pos];

 		if (unlikely(!de->name_len)) {
 			bit_pos++;
 			continue;
 		}

 		new_name.name = d.filename[bit_pos];
 		new_name.len = le16_to_cpu(de->name_len);

 		ino = le32_to_cpu(de->ino);
 		fake_mode = f2fs_get_de_type(de) << S_SHIFT;

 		err = f2fs_add_regular_entry(dir, &new_name, NULL, NULL,
 							ino, fake_mode);
 		if (err)
 			goto punch_dentry_pages;

 		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 	}
 	return 0;
 punch_dentry_pages:
 	truncate_inode_pages(&dir->i_data, 0);
 	f2fs_truncate_blocks(dir, 0, false);
 	f2fs_remove_dirty_inode(dir);
 	return err;
 }

 static int f2fs_move_rehashed_dirents(struct inode *dir, struct page *ipage,
 							void *inline_dentry)
 {
 	void *backup_dentry;
 	int err;

 	backup_dentry = f2fs_kmalloc(F2FS_I_SB(dir),
 				MAX_INLINE_DATA(dir), GFP_F2FS_ZERO);
 	if (!backup_dentry) {
 		f2fs_put_page(ipage, 1);
 		return -ENOMEM;
 	}

 	memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA(dir));
 	f2fs_truncate_inline_inode(dir, ipage, 0);

 	unlock_page(ipage);

 	err = f2fs_add_inline_entries(dir, backup_dentry);
 	if (err)
 		goto recover;

 	lock_page(ipage);

 	stat_dec_inline_dir(dir);
 	clear_inode_flag(dir, FI_INLINE_DENTRY);
 	kvfree(backup_dentry);
 	return 0;
 recover:
 	lock_page(ipage);
 	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
 	memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA(dir));
 	f2fs_i_depth_write(dir, 0);
 	f2fs_i_size_write(dir, MAX_INLINE_DATA(dir));
 	set_page_dirty(ipage);
 	f2fs_put_page(ipage, 1);

 	kvfree(backup_dentry);
 	return err;
 }

 static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage,
 							void *inline_dentry)
 {
 	if (!F2FS_I(dir)->i_dir_level)
 		return f2fs_move_inline_dirents(dir, ipage, inline_dentry);
 	else
 		return f2fs_move_rehashed_dirents(dir, ipage, inline_dentry);
 }

 int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
 				const struct qstr *orig_name,
 				struct inode *inode, nid_t ino, umode_t mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct page *ipage;
 	unsigned int bit_pos;
 	f2fs_hash_t name_hash;
 	void *inline_dentry = NULL;
 	struct f2fs_dentry_ptr d;
 	int slots = GET_DENTRY_SLOTS(new_name->len);
 	struct page *page = NULL;
 	int err = 0;

 	ipage = f2fs_get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage))
 		return PTR_ERR(ipage);

 	inline_dentry = inline_data_addr(dir, ipage);
 	make_dentry_ptr_inline(dir, &d, inline_dentry);

 	bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
 	if (bit_pos >= d.max) {
 		err = f2fs_convert_inline_dir(dir, ipage, inline_dentry);
 		if (err)
 			return err;
 		err = -EAGAIN;
 		goto out;
 	}

 	if (inode) {
 		down_write(&F2FS_I(inode)->i_sem);
 		page = f2fs_init_inode_metadata(inode, dir, new_name,
 						orig_name, ipage);
 		if (IS_ERR(page)) {
 			err = PTR_ERR(page);
 			goto fail;
 		}
 	}

 	f2fs_wait_on_page_writeback(ipage, NODE, true, true);

 	name_hash = f2fs_dentry_hash(new_name, NULL);
 	f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos);

 	set_page_dirty(ipage);

 	/* we don't need to mark_inode_dirty now */
 	if (inode) {
 		f2fs_i_pino_write(inode, dir->i_ino);
 		f2fs_put_page(page, 1);
 	}

 	f2fs_update_parent_metadata(dir, inode, 0);
 fail:
 	if (inode)
 		up_write(&F2FS_I(inode)->i_sem);
 out:
 	f2fs_put_page(ipage, 1);
 	return err;
 }

 void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 					struct inode *dir, struct inode *inode)
 {
 	struct f2fs_dentry_ptr d;
 	void *inline_dentry;
 	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
 	unsigned int bit_pos;
 	int i;

 	lock_page(page);
 	f2fs_wait_on_page_writeback(page, NODE, true, true);

 	inline_dentry = inline_data_addr(dir, page);
 	make_dentry_ptr_inline(dir, &d, inline_dentry);

 	bit_pos = dentry - d.dentry;
 	for (i = 0; i < slots; i++)
 		__clear_bit_le(bit_pos + i, d.bitmap);

 	set_page_dirty(page);
 	f2fs_put_page(page, 1);

 	dir->i_ctime = dir->i_mtime = current_time(dir);
 	f2fs_mark_inode_dirty_sync(dir, false);

 	if (inode)
 		f2fs_drop_nlink(dir, inode);
 }

 bool f2fs_empty_inline_dir(struct inode *dir)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 	struct page *ipage;
 	unsigned int bit_pos = 2;
 	void *inline_dentry;
 	struct f2fs_dentry_ptr d;

 	ipage = f2fs_get_node_page(sbi, dir->i_ino);
 	if (IS_ERR(ipage))
 		return false;

 	inline_dentry = inline_data_addr(dir, ipage);
 	make_dentry_ptr_inline(dir, &d, inline_dentry);

 	bit_pos = find_next_bit_le(d.bitmap, d.max, bit_pos);

 	f2fs_put_page(ipage, 1);

 	if (bit_pos < d.max)
 		return false;

 	return true;
 }

 int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 				struct fscrypt_str *fstr)
 {
 	struct inode *inode = file_inode(file);
 	struct page *ipage = NULL;
 	struct f2fs_dentry_ptr d;
 	void *inline_dentry = NULL;
 	int err;

 	make_dentry_ptr_inline(inode, &d, inline_dentry);

 	if (ctx->pos == d.max)
 		return 0;

 	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
 	if (IS_ERR(ipage))
 		return PTR_ERR(ipage);

 	/*
 	 * f2fs_readdir was protected by inode.i_rwsem, it is safe to access
 	 * ipage without page's lock held.
 	 */
 	unlock_page(ipage);

 	inline_dentry = inline_data_addr(inode, ipage);

 	make_dentry_ptr_inline(inode, &d, inline_dentry);

 	err = f2fs_fill_dentries(ctx, &d, 0, fstr);
 	if (!err)
 		ctx->pos = d.max;

 	f2fs_put_page(ipage, 0);
 	return err < 0 ? err : 0;
 }

 int f2fs_inline_data_fiemap(struct inode *inode,
 		struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
 {
 	__u64 byteaddr, ilen;
 	__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
 		FIEMAP_EXTENT_LAST;
 	struct node_info ni;
 	struct page *ipage;
 	int err = 0;

 	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
 	if (IS_ERR(ipage))
 		return PTR_ERR(ipage);

 	if (!f2fs_has_inline_data(inode)) {
 		err = -EAGAIN;
 		goto out;
 	}

 	ilen = min_t(size_t, MAX_INLINE_DATA(inode), i_size_read(inode));
 	if (start >= ilen)
 		goto out;
 	if (start + len < ilen)
 		ilen = start + len;
 	ilen -= start;

 	err = f2fs_get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
 	if (err)
 		goto out;

 	byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
 	byteaddr += (char *)inline_data_addr(inode, ipage) -
 					(char *)F2FS_INODE(ipage);
 	err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
 out:
 	f2fs_put_page(ipage, 1);
 	return err;
 }
	// 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 "f2fs.h"
	#include "node.h"
	#include <trace/events/android_fs.h>

	bool f2fs_may_inline_data(struct inode *inode)
	{
	if (f2fs_is_atomic_file(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;

	if (f2fs_post_read_required(inode))
	return false;

	return true;
	}

	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 page page, struct page ipage)
	{
	struct inode *inode = page->mapping->host;
	void src_addr, dst_addr;

	if (PageUptodate(page))
	return;

	f2fs_bug_on(F2FS_P_SB(page), page->index);

	zero_user_segment(page, MAX_INLINE_DATA(inode), PAGE_SIZE);

	/* Copy the whole inline data block */
	src_addr = inline_data_addr(inode, ipage);
	dst_addr = kmap_atomic(page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
	flush_dcache_page(page);
	kunmap_atomic(dst_addr);
	if (!PageUptodate(page))
	SetPageUptodate(page);
	}

	void f2fs_truncate_inline_inode(struct inode *inode,
	struct page *ipage, u64 from)
	{
	void *addr;

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

	addr = inline_data_addr(inode, ipage);

	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
	memset(addr + from, 0, MAX_INLINE_DATA(inode) - from);
	set_page_dirty(ipage);

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

	int f2fs_read_inline_data(struct inode inode, struct page page)
	{
	struct page *ipage;

	if (trace_android_fs_dataread_start_enabled()) {
	char *path, pathbuf[MAX_TRACE_PATHBUF_LEN];

	path = android_fstrace_get_pathname(pathbuf,
	MAX_TRACE_PATHBUF_LEN,
	inode);
	trace_android_fs_dataread_start(inode, page_offset(page),
	PAGE_SIZE, current->pid,
	path, current->comm);
	}

	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
	if (IS_ERR(ipage)) {
	trace_android_fs_dataread_end(inode, page_offset(page),
	PAGE_SIZE);
	unlock_page(page);
	return PTR_ERR(ipage);
	}

	if (!f2fs_has_inline_data(inode)) {
	f2fs_put_page(ipage, 1);
	trace_android_fs_dataread_end(inode, page_offset(page),
	PAGE_SIZE);
	return -EAGAIN;
	}

	if (page->index)
	zero_user_segment(page, 0, PAGE_SIZE);
	else
	f2fs_do_read_inline_data(page, ipage);

	if (!PageUptodate(page))
	SetPageUptodate(page);
	f2fs_put_page(ipage, 1);
	trace_android_fs_dataread_end(inode, page_offset(page),
	PAGE_SIZE);
	unlock_page(page);
	return 0;
	}

	int f2fs_convert_inline_page(struct dnode_of_data dn, struct page page)
	{
	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,
	.page = page,
	.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);
	if (err) {
	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);
	f2fs_msg(fio.sbi->sb, KERN_WARNING,
	"%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, "
	"run fsck to fix.",
	__func__, dn->inode->i_ino, dn->data_blkaddr);
	return -EINVAL;
	}

	f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));

	f2fs_do_read_inline_data(page, dn->inode_page);
	set_page_dirty(page);

	/* clear dirty state */
	dirty = clear_page_dirty_for_io(page);

	/* write data page to try to make data consistent */
	set_page_writeback(page);
	ClearPageError(page);
	fio.old_blkaddr = dn->data_blkaddr;
	set_inode_flag(dn->inode, FI_HOT_DATA);
	f2fs_outplace_write_data(dn, &fio);
	f2fs_wait_on_page_writeback(page, DATA, true, true);
	if (dirty) {
	inode_dec_dirty_pages(dn->inode);
	f2fs_remove_dirty_inode(dn->inode);
	}

	/* this converted inline_data should be recovered. */
	set_inode_flag(dn->inode, FI_APPEND_WRITE);

	/* clear inline data and flag after data writeback */
	f2fs_truncate_inline_inode(dn->inode, dn->inode_page, 0);
	clear_inline_node(dn->inode_page);
	clear_out:
	stat_dec_inline_inode(dn->inode);
	clear_inode_flag(dn->inode, FI_INLINE_DATA);
	f2fs_put_dnode(dn);
	return 0;
	}

	int f2fs_convert_inline_inode(struct inode *inode)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct dnode_of_data dn;
	struct page ipage, page;
	int err = 0;

	if (!f2fs_has_inline_data(inode))
	return 0;

	page = f2fs_grab_cache_page(inode->i_mapping, 0, false);
	if (!page)
	return -ENOMEM;

	f2fs_lock_op(sbi);

	ipage = f2fs_get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage)) {
	err = PTR_ERR(ipage);
	goto out;
	}

	set_new_dnode(&dn, inode, ipage, ipage, 0);

	if (f2fs_has_inline_data(inode))
	err = f2fs_convert_inline_page(&dn, page);

	f2fs_put_dnode(&dn);
	out:
	f2fs_unlock_op(sbi);

	f2fs_put_page(page, 1);

	f2fs_balance_fs(sbi, dn.node_changed);

	return err;
	}

	int f2fs_write_inline_data(struct inode inode, struct page page)
	{
	void src_addr, dst_addr;
	struct dnode_of_data dn;
	int err;

	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = f2fs_get_dnode_of_data(&dn, 0, LOOKUP_NODE);
	if (err)
	return err;

	if (!f2fs_has_inline_data(inode)) {
	f2fs_put_dnode(&dn);
	return -EAGAIN;
	}

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

	f2fs_wait_on_page_writeback(dn.inode_page, NODE, true, true);
	src_addr = kmap_atomic(page);
	dst_addr = inline_data_addr(inode, dn.inode_page);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));
	kunmap_atomic(src_addr);
	set_page_dirty(dn.inode_page);

	f2fs_clear_radix_tree_dirty_tag(page);

	set_inode_flag(inode, FI_APPEND_WRITE);
	set_inode_flag(inode, FI_DATA_EXIST);

	clear_inline_node(dn.inode_page);
	f2fs_put_dnode(&dn);
	return 0;
	}

	bool f2fs_recover_inline_data(struct inode inode, struct page npage)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
	struct f2fs_inode *ri = NULL;
	void src_addr, dst_addr;
	struct page *ipage;

	/*
	* The inline_data recovery policy is as follows.
	* [prev.] [next] of inline_data flag
	* o o -> recover inline_data
	* o x -> remove inline_data, and then recover data blocks
	* x o -> remove inline_data, and then recover inline_data
	* x x -> recover data blocks
	*/
	if (IS_INODE(npage))
	ri = F2FS_INODE(npage);

	if (f2fs_has_inline_data(inode) &&
	ri && (ri->i_inline & F2FS_INLINE_DATA)) {
	process_inline:
	ipage = f2fs_get_node_page(sbi, inode->i_ino);
	f2fs_bug_on(sbi, IS_ERR(ipage));

	f2fs_wait_on_page_writeback(ipage, NODE, true, true);

	src_addr = inline_data_addr(inode, npage);
	dst_addr = inline_data_addr(inode, ipage);
	memcpy(dst_addr, src_addr, MAX_INLINE_DATA(inode));

	set_inode_flag(inode, FI_INLINE_DATA);
	set_inode_flag(inode, FI_DATA_EXIST);

	set_page_dirty(ipage);
	f2fs_put_page(ipage, 1);
	return true;
	}

	if (f2fs_has_inline_data(inode)) {
	ipage = f2fs_get_node_page(sbi, inode->i_ino);
	f2fs_bug_on(sbi, IS_ERR(ipage));
	f2fs_truncate_inline_inode(inode, ipage, 0);
	clear_inode_flag(inode, FI_INLINE_DATA);
	f2fs_put_page(ipage, 1);
	} else if (ri && (ri->i_inline & F2FS_INLINE_DATA)) {
	if (f2fs_truncate_blocks(inode, 0, false))
	return false;
	goto process_inline;
	}
	return false;
	}

	struct f2fs_dir_entry f2fs_find_in_inline_dir(struct inode dir,
	struct fscrypt_name fname, struct page *res_page)
	{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	struct qstr name = FSTR_TO_QSTR(&fname->disk_name);
	struct f2fs_dir_entry *de;
	struct f2fs_dentry_ptr d;
	struct page *ipage;
	void *inline_dentry;
	f2fs_hash_t namehash;

	ipage = f2fs_get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage)) {
	*res_page = ipage;
	return NULL;
	}

	namehash = f2fs_dentry_hash(&name, fname);

	inline_dentry = inline_data_addr(dir, ipage);

	make_dentry_ptr_inline(dir, &d, inline_dentry);
	de = f2fs_find_target_dentry(fname, namehash, NULL, &d);
	unlock_page(ipage);
	if (de)
	*res_page = ipage;
	else
	f2fs_put_page(ipage, 0);

	return de;
	}

	int f2fs_make_empty_inline_dir(struct inode inode, struct inode parent,
	struct page *ipage)
	{
	struct f2fs_dentry_ptr d;
	void *inline_dentry;

	inline_dentry = inline_data_addr(inode, ipage);

	make_dentry_ptr_inline(inode, &d, inline_dentry);
	f2fs_do_make_empty_dir(inode, parent, &d);

	set_page_dirty(ipage);

	/* update i_size to MAX_INLINE_DATA */
	if (i_size_read(inode) < MAX_INLINE_DATA(inode))
	f2fs_i_size_write(inode, MAX_INLINE_DATA(inode));
	return 0;
	}

	/*
	* NOTE: ipage is grabbed by caller, but if any error occurs, we should
	* release ipage in this function.
	*/
	static int f2fs_move_inline_dirents(struct inode dir, struct page ipage,
	void *inline_dentry)
	{
	struct page *page;
	struct dnode_of_data dn;
	struct f2fs_dentry_block *dentry_blk;
	struct f2fs_dentry_ptr src, dst;
	int err;

	page = f2fs_grab_cache_page(dir->i_mapping, 0, false);
	if (!page) {
	f2fs_put_page(ipage, 1);
	return -ENOMEM;
	}

	set_new_dnode(&dn, dir, ipage, NULL, 0);
	err = f2fs_reserve_block(&dn, 0);
	if (err)
	goto out;

	if (unlikely(dn.data_blkaddr != NEW_ADDR)) {
	f2fs_put_dnode(&dn);
	set_sbi_flag(F2FS_P_SB(page), SBI_NEED_FSCK);
	f2fs_msg(F2FS_P_SB(page)->sb, KERN_WARNING,
	"%s: corrupted inline inode ino=%lx, i_addr[0]:0x%x, "
	"run fsck to fix.",
	__func__, dir->i_ino, dn.data_blkaddr);
	err = -EINVAL;
	goto out;
	}

	f2fs_wait_on_page_writeback(page, DATA, true, true);

	dentry_blk = page_address(page);

	make_dentry_ptr_inline(dir, &src, inline_dentry);
	make_dentry_ptr_block(dir, &dst, dentry_blk);

	/* copy data from inline dentry block to new dentry block */
	memcpy(dst.bitmap, src.bitmap, src.nr_bitmap);
	memset(dst.bitmap + src.nr_bitmap, 0, dst.nr_bitmap - src.nr_bitmap);
	/*
	* we do not need to zero out remainder part of dentry and filename
	* field, since we have used bitmap for marking the usage status of
	* them, besides, we can also ignore copying/zeroing reserved space
	* of dentry block, because them haven't been used so far.
	*/
	memcpy(dst.dentry, src.dentry, SIZE_OF_DIR_ENTRY * src.max);
	memcpy(dst.filename, src.filename, src.max * F2FS_SLOT_LEN);

	if (!PageUptodate(page))
	SetPageUptodate(page);
	set_page_dirty(page);

	/* clear inline dir and flag after data writeback */
	f2fs_truncate_inline_inode(dir, ipage, 0);

	stat_dec_inline_dir(dir);
	clear_inode_flag(dir, FI_INLINE_DENTRY);

	f2fs_i_depth_write(dir, 1);
	if (i_size_read(dir) < PAGE_SIZE)
	f2fs_i_size_write(dir, PAGE_SIZE);
	out:
	f2fs_put_page(page, 1);
	return err;
	}

	static int f2fs_add_inline_entries(struct inode dir, void inline_dentry)
	{
	struct f2fs_dentry_ptr d;
	unsigned long bit_pos = 0;
	int err = 0;

	make_dentry_ptr_inline(dir, &d, inline_dentry);

	while (bit_pos < d.max) {
	struct f2fs_dir_entry *de;
	struct qstr new_name;
	nid_t ino;
	umode_t fake_mode;

	if (!test_bit_le(bit_pos, d.bitmap)) {
	bit_pos++;
	continue;
	}

	de = &d.dentry[bit_pos];

	if (unlikely(!de->name_len)) {
	bit_pos++;
	continue;
	}

	new_name.name = d.filename[bit_pos];
	new_name.len = le16_to_cpu(de->name_len);

	ino = le32_to_cpu(de->ino);
	fake_mode = f2fs_get_de_type(de) << S_SHIFT;

	err = f2fs_add_regular_entry(dir, &new_name, NULL, NULL,
	ino, fake_mode);
	if (err)
	goto punch_dentry_pages;

	bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
	}
	return 0;
	punch_dentry_pages:
	truncate_inode_pages(&dir->i_data, 0);
	f2fs_truncate_blocks(dir, 0, false);
	f2fs_remove_dirty_inode(dir);
	return err;
	}

	static int f2fs_move_rehashed_dirents(struct inode dir, struct page ipage,
	void *inline_dentry)
	{
	void *backup_dentry;
	int err;

	backup_dentry = f2fs_kmalloc(F2FS_I_SB(dir),
	MAX_INLINE_DATA(dir), GFP_F2FS_ZERO);
	if (!backup_dentry) {
	f2fs_put_page(ipage, 1);
	return -ENOMEM;
	}

	memcpy(backup_dentry, inline_dentry, MAX_INLINE_DATA(dir));
	f2fs_truncate_inline_inode(dir, ipage, 0);

	unlock_page(ipage);

	err = f2fs_add_inline_entries(dir, backup_dentry);
	if (err)
	goto recover;

	lock_page(ipage);

	stat_dec_inline_dir(dir);
	clear_inode_flag(dir, FI_INLINE_DENTRY);
	kvfree(backup_dentry);
	return 0;
	recover:
	lock_page(ipage);
	f2fs_wait_on_page_writeback(ipage, NODE, true, true);
	memcpy(inline_dentry, backup_dentry, MAX_INLINE_DATA(dir));
	f2fs_i_depth_write(dir, 0);
	f2fs_i_size_write(dir, MAX_INLINE_DATA(dir));
	set_page_dirty(ipage);
	f2fs_put_page(ipage, 1);

	kvfree(backup_dentry);
	return err;
	}

	static int f2fs_convert_inline_dir(struct inode dir, struct page ipage,
	void *inline_dentry)
	{
	if (!F2FS_I(dir)->i_dir_level)
	return f2fs_move_inline_dirents(dir, ipage, inline_dentry);
	else
	return f2fs_move_rehashed_dirents(dir, ipage, inline_dentry);
	}

	int f2fs_add_inline_entry(struct inode dir, const struct qstr new_name,
	const struct qstr *orig_name,
	struct inode *inode, nid_t ino, umode_t mode)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct page *ipage;
	unsigned int bit_pos;
	f2fs_hash_t name_hash;
	void *inline_dentry = NULL;
	struct f2fs_dentry_ptr d;
	int slots = GET_DENTRY_SLOTS(new_name->len);
	struct page *page = NULL;
	int err = 0;

	ipage = f2fs_get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage))
	return PTR_ERR(ipage);

	inline_dentry = inline_data_addr(dir, ipage);
	make_dentry_ptr_inline(dir, &d, inline_dentry);

	bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max);
	if (bit_pos >= d.max) {
	err = f2fs_convert_inline_dir(dir, ipage, inline_dentry);
	if (err)
	return err;
	err = -EAGAIN;
	goto out;
	}

	if (inode) {
	down_write(&F2FS_I(inode)->i_sem);
	page = f2fs_init_inode_metadata(inode, dir, new_name,
	orig_name, ipage);
	if (IS_ERR(page)) {
	err = PTR_ERR(page);
	goto fail;
	}
	}

	f2fs_wait_on_page_writeback(ipage, NODE, true, true);

	name_hash = f2fs_dentry_hash(new_name, NULL);
	f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos);

	set_page_dirty(ipage);

	/* we don't need to mark_inode_dirty now */
	if (inode) {
	f2fs_i_pino_write(inode, dir->i_ino);
	f2fs_put_page(page, 1);
	}

	f2fs_update_parent_metadata(dir, inode, 0);
	fail:
	if (inode)
	up_write(&F2FS_I(inode)->i_sem);
	out:
	f2fs_put_page(ipage, 1);
	return err;
	}

	void f2fs_delete_inline_entry(struct f2fs_dir_entry dentry, struct page page,
	struct inode dir, struct inode inode)
	{
	struct f2fs_dentry_ptr d;
	void *inline_dentry;
	int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
	unsigned int bit_pos;
	int i;

	lock_page(page);
	f2fs_wait_on_page_writeback(page, NODE, true, true);

	inline_dentry = inline_data_addr(dir, page);
	make_dentry_ptr_inline(dir, &d, inline_dentry);

	bit_pos = dentry - d.dentry;
	for (i = 0; i < slots; i++)
	__clear_bit_le(bit_pos + i, d.bitmap);

	set_page_dirty(page);
	f2fs_put_page(page, 1);

	dir->i_ctime = dir->i_mtime = current_time(dir);
	f2fs_mark_inode_dirty_sync(dir, false);

	if (inode)
	f2fs_drop_nlink(dir, inode);
	}

	bool f2fs_empty_inline_dir(struct inode *dir)
	{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct page *ipage;
	unsigned int bit_pos = 2;
	void *inline_dentry;
	struct f2fs_dentry_ptr d;

	ipage = f2fs_get_node_page(sbi, dir->i_ino);
	if (IS_ERR(ipage))
	return false;

	inline_dentry = inline_data_addr(dir, ipage);
	make_dentry_ptr_inline(dir, &d, inline_dentry);

	bit_pos = find_next_bit_le(d.bitmap, d.max, bit_pos);

	f2fs_put_page(ipage, 1);

	if (bit_pos < d.max)
	return false;

	return true;
	}

	int f2fs_read_inline_dir(struct file file, struct dir_context ctx,
	struct fscrypt_str *fstr)
	{
	struct inode *inode = file_inode(file);
	struct page *ipage = NULL;
	struct f2fs_dentry_ptr d;
	void *inline_dentry = NULL;
	int err;

	make_dentry_ptr_inline(inode, &d, inline_dentry);

	if (ctx->pos == d.max)
	return 0;

	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
	if (IS_ERR(ipage))
	return PTR_ERR(ipage);

	/*
	* f2fs_readdir was protected by inode.i_rwsem, it is safe to access
	* ipage without page's lock held.
	*/
	unlock_page(ipage);

	inline_dentry = inline_data_addr(inode, ipage);

	make_dentry_ptr_inline(inode, &d, inline_dentry);

	err = f2fs_fill_dentries(ctx, &d, 0, fstr);
	if (!err)
	ctx->pos = d.max;

	f2fs_put_page(ipage, 0);
	return err < 0 ? err : 0;
	}

	int f2fs_inline_data_fiemap(struct inode *inode,
	struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
	{
	__u64 byteaddr, ilen;
	__u32 flags = FIEMAP_EXTENT_DATA_INLINE \| FIEMAP_EXTENT_NOT_ALIGNED \|
	FIEMAP_EXTENT_LAST;
	struct node_info ni;
	struct page *ipage;
	int err = 0;

	ipage = f2fs_get_node_page(F2FS_I_SB(inode), inode->i_ino);
	if (IS_ERR(ipage))
	return PTR_ERR(ipage);

	if (!f2fs_has_inline_data(inode)) {
	err = -EAGAIN;
	goto out;
	}

	ilen = min_t(size_t, MAX_INLINE_DATA(inode), i_size_read(inode));
	if (start >= ilen)
	goto out;
	if (start + len < ilen)
	ilen = start + len;
	ilen -= start;

	err = f2fs_get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni);
	if (err)
	goto out;

	byteaddr = (__u64)ni.blk_addr << inode->i_sb->s_blocksize_bits;
	byteaddr += (char *)inline_data_addr(inode, ipage) -
	(char *)F2FS_INODE(ipage);
	err = fiemap_fill_next_extent(fieinfo, start, byteaddr, ilen, flags);
	out:
	f2fs_put_page(ipage, 1);
	return err;
	}