text: // SPDX-License-Identifier: GPL-2.0
  /*
   * fs/f2fs/file.c
   *
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   *             http://www.samsung.com/
   */
  #include <linux/fs.h>
  #include <linux/f2fs_fs.h>
  #include <linux/stat.h>
  #include <linux/buffer_head.h>
  #include <linux/writeback.h>
  #include <linux/blkdev.h>
  #include <linux/falloc.h>
  #include <linux/types.h>
  #include <linux/compat.h>
  #include <linux/uaccess.h>
  #include <linux/mount.h>
  #include <linux/pagevec.h>
  #include <linux/uio.h>
  #include <linux/uuid.h>
  #include <linux/file.h>
  
  #include "f2fs.h"
  #include "node.h"
  #include "segment.h"
  #include "xattr.h"
  #include "acl.h"
  #include "gc.h"
  #include "trace.h"
  #include <trace/events/f2fs.h>
  
  static int f2fs_filemap_fault(struct vm_area_struct *vma,
  					struct vm_fault *vmf)
  {
  	struct inode *inode = file_inode(vma->vm_file);
  	int err;
  
  	down_read(&F2FS_I(inode)->i_mmap_sem);
  	err = filemap_fault(vma, vmf);
  	up_read(&F2FS_I(inode)->i_mmap_sem);
  
  	trace_f2fs_filemap_fault(inode, vmf->pgoff, (unsigned long)err);
  
  	return err;
  }
  
  static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
  						struct vm_fault *vmf)
  {
  	struct page *page = vmf->page;
  	struct inode *inode = file_inode(vma->vm_file);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct dnode_of_data dn = { .node_changed = false };
  	int err;
  
  	if (unlikely(f2fs_cp_error(sbi))) {
  		err = -EIO;
  		goto err;
  	}
  
  	sb_start_pagefault(inode->i_sb);
  
  	f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
  
  	file_update_time(vma->vm_file);
  	down_read(&F2FS_I(inode)->i_mmap_sem);
  	lock_page(page);
  	if (unlikely(page->mapping != inode->i_mapping ||
  			page_offset(page) > i_size_read(inode) ||
  			!PageUptodate(page))) {
  		unlock_page(page);
  		err = -EFAULT;
  		goto out_sem;
  	}
  
  	/* block allocation */
  	__do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
  	set_new_dnode(&dn, inode, NULL, NULL, 0);
  	err = f2fs_get_block(&dn, page->index);
  	f2fs_put_dnode(&dn);
  	__do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
  	if (err) {
  		unlock_page(page);
  		goto out_sem;
  	}
  
  	/* fill the page */
  	f2fs_wait_on_page_writeback(page, DATA, false, true);
  
  	/* wait for GCed page writeback via META_MAPPING */
  	f2fs_wait_on_block_writeback(inode, dn.data_blkaddr);
  
  	/*
  	 * check to see if the page is mapped already (no holes)
  	 */
  	if (PageMappedToDisk(page))
  		goto out_sem;
  
  	/* page is wholly or partially inside EOF */
  	if (((loff_t)(page->index + 1) << PAGE_SHIFT) >
  						i_size_read(inode)) {
  		loff_t offset;
  
  		offset = i_size_read(inode) & ~PAGE_MASK;
  		zero_user_segment(page, offset, PAGE_SIZE);
  	}
  	set_page_dirty(page);
  	if (!PageUptodate(page))
  		SetPageUptodate(page);
  
  	f2fs_update_iostat(sbi, APP_MAPPED_IO, F2FS_BLKSIZE);
  	f2fs_update_time(sbi, REQ_TIME);
  
  	trace_f2fs_vm_page_mkwrite(page, DATA);
  out_sem:
  	up_read(&F2FS_I(inode)->i_mmap_sem);
  
  	f2fs_balance_fs(sbi, dn.node_changed);
  
  	sb_end_pagefault(inode->i_sb);
  err:
  	return block_page_mkwrite_return(err);
  }
  
  static const struct vm_operations_struct f2fs_file_vm_ops = {
  	.fault		= f2fs_filemap_fault,
  	.map_pages	= filemap_map_pages,
  	.page_mkwrite	= f2fs_vm_page_mkwrite,
  };
  
  static int get_parent_ino(struct inode *inode, nid_t *pino)
  {
  	struct dentry *dentry;
  
  	inode = igrab(inode);
  	dentry = d_find_any_alias(inode);
  	iput(inode);
  	if (!dentry)
  		return 0;
  
  	*pino = parent_ino(dentry);
  	dput(dentry);
  	return 1;
  }
  
  static inline enum cp_reason_type need_do_checkpoint(struct inode *inode)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	enum cp_reason_type cp_reason = CP_NO_NEEDED;
  
  	if (!S_ISREG(inode->i_mode))
  		cp_reason = CP_NON_REGULAR;
  	else if (inode->i_nlink != 1)
  		cp_reason = CP_HARDLINK;
  	else if (is_sbi_flag_set(sbi, SBI_NEED_CP))
  		cp_reason = CP_SB_NEED_CP;
  	else if (file_wrong_pino(inode))
  		cp_reason = CP_WRONG_PINO;
  	else if (!f2fs_space_for_roll_forward(sbi))
  		cp_reason = CP_NO_SPC_ROLL;
  	else if (!f2fs_is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
  		cp_reason = CP_NODE_NEED_CP;
  	else if (test_opt(sbi, FASTBOOT))
  		cp_reason = CP_FASTBOOT_MODE;
  	else if (F2FS_OPTION(sbi).active_logs == 2)
  		cp_reason = CP_SPEC_LOG_NUM;
  	else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT &&
  		f2fs_need_dentry_mark(sbi, inode->i_ino) &&
  		f2fs_exist_written_data(sbi, F2FS_I(inode)->i_pino,
  							TRANS_DIR_INO))
  		cp_reason = CP_RECOVER_DIR;
  
  	return cp_reason;
  }
  
  static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
  {
  	struct page *i = find_get_page(NODE_MAPPING(sbi), ino);
  	bool ret = false;
  	/* But we need to avoid that there are some inode updates */
  	if ((i && PageDirty(i)) || f2fs_need_inode_block_update(sbi, ino))
  		ret = true;
  	f2fs_put_page(i, 0);
  	return ret;
  }
  
  static void try_to_fix_pino(struct inode *inode)
  {
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	nid_t pino;
  
  	down_write(&fi->i_sem);
  	if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
  			get_parent_ino(inode, &pino)) {
  		f2fs_i_pino_write(inode, pino);
  		file_got_pino(inode);
  	}
  	up_write(&fi->i_sem);
  }
  
  static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
  						int datasync, bool atomic)
  {
  	struct inode *inode = file->f_mapping->host;
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	nid_t ino = inode->i_ino;
  	int ret = 0;
  	enum cp_reason_type cp_reason = 0;
  	struct writeback_control wbc = {
  		.sync_mode = WB_SYNC_ALL,
  		.nr_to_write = LONG_MAX,
  		.for_reclaim = 0,
  	};
  	unsigned int seq_id = 0;
  
  	if (unlikely(f2fs_readonly(inode->i_sb) ||
  				is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
  		return 0;
  
  	trace_f2fs_sync_file_enter(inode);
  
  	if (S_ISDIR(inode->i_mode))
  		goto go_write;
  
  	/* if fdatasync is triggered, let's do in-place-update */
  	if (datasync || get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
  		set_inode_flag(inode, FI_NEED_IPU);
  	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
  	clear_inode_flag(inode, FI_NEED_IPU);
  
  	if (ret) {
  		trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
  		return ret;
  	}
  
  	/* if the inode is dirty, let's recover all the time */
  	if (!f2fs_skip_inode_update(inode, datasync)) {
  		f2fs_write_inode(inode, NULL);
  		goto go_write;
  	}
  
  	/*
  	 * if there is no written data, don't waste time to write recovery info.
  	 */
  	if (!is_inode_flag_set(inode, FI_APPEND_WRITE) &&
  			!f2fs_exist_written_data(sbi, ino, APPEND_INO)) {
  
  		/* it may call write_inode just prior to fsync */
  		if (need_inode_page_update(sbi, ino))
  			goto go_write;
  
  		if (is_inode_flag_set(inode, FI_UPDATE_WRITE) ||
  				f2fs_exist_written_data(sbi, ino, UPDATE_INO))
  			goto flush_out;
  		goto out;
  	}
  go_write:
  	/*
  	 * Both of fdatasync() and fsync() are able to be recovered from
  	 * sudden-power-off.
  	 */
  	down_read(&F2FS_I(inode)->i_sem);
  	cp_reason = need_do_checkpoint(inode);
  	up_read(&F2FS_I(inode)->i_sem);
  
  	if (cp_reason) {
  		/* all the dirty node pages should be flushed for POR */
  		ret = f2fs_sync_fs(inode->i_sb, 1);
  
  		/*
  		 * We've secured consistency through sync_fs. Following pino
  		 * will be used only for fsynced inodes after checkpoint.
  		 */
  		try_to_fix_pino(inode);
  		clear_inode_flag(inode, FI_APPEND_WRITE);
  		clear_inode_flag(inode, FI_UPDATE_WRITE);
  		goto out;
  	}
  sync_nodes:
  	atomic_inc(&sbi->wb_sync_req[NODE]);
  	ret = f2fs_fsync_node_pages(sbi, inode, &wbc, atomic, &seq_id);
  	atomic_dec(&sbi->wb_sync_req[NODE]);
  	if (ret)
  		goto out;
  
  	/* if cp_error was enabled, we should avoid infinite loop */
  	if (unlikely(f2fs_cp_error(sbi))) {
  		ret = -EIO;
  		goto out;
  	}
  
  	if (f2fs_need_inode_block_update(sbi, ino)) {
  		f2fs_mark_inode_dirty_sync(inode, true);
  		f2fs_write_inode(inode, NULL);
  		goto sync_nodes;
  	}
  
  	/*
  	 * If it's atomic_write, it's just fine to keep write ordering. So
  	 * here we don't need to wait for node write completion, since we use
  	 * node chain which serializes node blocks. If one of node writes are
  	 * reordered, we can see simply broken chain, resulting in stopping
  	 * roll-forward recovery. It means we'll recover all or none node blocks
  	 * given fsync mark.
  	 */
  	if (!atomic) {
  		ret = f2fs_wait_on_node_pages_writeback(sbi, seq_id);
  		if (ret)
  			goto out;
  	}
  
  	/* once recovery info is written, don't need to tack this */
  	f2fs_remove_ino_entry(sbi, ino, APPEND_INO);
  	clear_inode_flag(inode, FI_APPEND_WRITE);
  flush_out:
  	if (!atomic && F2FS_OPTION(sbi).fsync_mode != FSYNC_MODE_NOBARRIER)
  		ret = f2fs_issue_flush(sbi, inode->i_ino);
  	if (!ret) {
  		f2fs_remove_ino_entry(sbi, ino, UPDATE_INO);
  		clear_inode_flag(inode, FI_UPDATE_WRITE);
  		f2fs_remove_ino_entry(sbi, ino, FLUSH_INO);
  	}
  	f2fs_update_time(sbi, REQ_TIME);
  out:
  	trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
  	f2fs_trace_ios(NULL, 1);
  	return ret;
  }
  
  int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
  {
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(file)))))
  		return -EIO;
  	return f2fs_do_sync_file(file, start, end, datasync, false);
  }
  
  static pgoff_t __get_first_dirty_index(struct address_space *mapping,
  						pgoff_t pgofs, int whence)
  {
  	struct page *page;
  	int nr_pages;
  
  	if (whence != SEEK_DATA)
  		return 0;
  
  	/* find first dirty page index */
  	nr_pages = find_get_pages_tag(mapping, &pgofs, PAGECACHE_TAG_DIRTY,
  				      1, &page);
  	if (!nr_pages)
  		return ULONG_MAX;
  	pgofs = page->index;
  	put_page(page);
  	return pgofs;
  }
  
  static bool __found_offset(struct f2fs_sb_info *sbi, block_t blkaddr,
  				pgoff_t dirty, pgoff_t pgofs, int whence)
  {
  	switch (whence) {
  	case SEEK_DATA:
  		if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
  			__is_valid_data_blkaddr(blkaddr))
  			return true;
  		break;
  	case SEEK_HOLE:
  		if (blkaddr == NULL_ADDR)
  			return true;
  		break;
  	}
  	return false;
  }
  
  static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
  {
  	struct inode *inode = file->f_mapping->host;
  	loff_t maxbytes = inode->i_sb->s_maxbytes;
  	struct dnode_of_data dn;
  	pgoff_t pgofs, end_offset, dirty;
  	loff_t data_ofs = offset;
  	loff_t isize;
  	int err = 0;
  
  	inode_lock(inode);
  
  	isize = i_size_read(inode);
  	if (offset >= isize)
  		goto fail;
  
  	/* handle inline data case */
  	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
  		if (whence == SEEK_HOLE)
  			data_ofs = isize;
  		goto found;
  	}
  
  	pgofs = (pgoff_t)(offset >> PAGE_SHIFT);
  
  	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);
  
  	for (; data_ofs < isize; data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
  		set_new_dnode(&dn, inode, NULL, NULL, 0);
  		err = f2fs_get_dnode_of_data(&dn, pgofs, LOOKUP_NODE);
  		if (err && err != -ENOENT) {
  			goto fail;
  		} else if (err == -ENOENT) {
  			/* direct node does not exists */
  			if (whence == SEEK_DATA) {
  				pgofs = f2fs_get_next_page_offset(&dn, pgofs);
  				continue;
  			} else {
  				goto found;
  			}
  		}
  
  		end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
  
  		/* find data/hole in dnode block */
  		for (; dn.ofs_in_node < end_offset;
  				dn.ofs_in_node++, pgofs++,
  				data_ofs = (loff_t)pgofs << PAGE_SHIFT) {
  			block_t blkaddr;
  
  			blkaddr = datablock_addr(dn.inode,
  					dn.node_page, dn.ofs_in_node);
  
  			if (__is_valid_data_blkaddr(blkaddr) &&
  				!f2fs_is_valid_blkaddr(F2FS_I_SB(inode),
  					blkaddr, DATA_GENERIC_ENHANCE)) {
  				f2fs_put_dnode(&dn);
  				goto fail;
  			}
  
  			if (__found_offset(F2FS_I_SB(inode), blkaddr, dirty,
  							pgofs, whence)) {
  				f2fs_put_dnode(&dn);
  				goto found;
  			}
  		}
  		f2fs_put_dnode(&dn);
  	}
  
  	if (whence == SEEK_DATA)
  		goto fail;
  found:
  	if (whence == SEEK_HOLE && data_ofs > isize)
  		data_ofs = isize;
  	inode_unlock(inode);
  	return vfs_setpos(file, data_ofs, maxbytes);
  fail:
  	inode_unlock(inode);
  	return -ENXIO;
  }
  
  static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
  {
  	struct inode *inode = file->f_mapping->host;
  	loff_t maxbytes = inode->i_sb->s_maxbytes;
  
  	switch (whence) {
  	case SEEK_SET:
  	case SEEK_CUR:
  	case SEEK_END:
  		return generic_file_llseek_size(file, offset, whence,
  						maxbytes, i_size_read(inode));
  	case SEEK_DATA:
  	case SEEK_HOLE:
  		if (offset < 0)
  			return -ENXIO;
  		return f2fs_seek_block(file, offset, whence);
  	}
  
  	return -EINVAL;
  }
  
  static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
  {
  	struct inode *inode = file_inode(file);
  	int err;
  
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
  		return -EIO;
  
  	/* we don't need to use inline_data strictly */
  	err = f2fs_convert_inline_inode(inode);
  	if (err)
  		return err;
  
  	file_accessed(file);
  	vma->vm_ops = &f2fs_file_vm_ops;
  	return 0;
  }
  
  static int f2fs_file_open(struct inode *inode, struct file *filp)
  {
  	int err = fscrypt_file_open(inode, filp);
  
  	if (err)
  		return err;
  
  	filp->f_mode |= FMODE_NOWAIT;
  
  	return dquot_file_open(inode, filp);
  }
  
  void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
  	struct f2fs_node *raw_node;
  	int nr_free = 0, ofs = dn->ofs_in_node, len = count;
  	__le32 *addr;
  	int base = 0;
  
  	if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
  		base = get_extra_isize(dn->inode);
  
  	raw_node = F2FS_NODE(dn->node_page);
  	addr = blkaddr_in_node(raw_node) + base + ofs;
  
  	for (; count > 0; count--, addr++, dn->ofs_in_node++) {
  		block_t blkaddr = le32_to_cpu(*addr);
  
  		if (blkaddr == NULL_ADDR)
  			continue;
  
  		dn->data_blkaddr = NULL_ADDR;
  		f2fs_set_data_blkaddr(dn);
  
  		if (__is_valid_data_blkaddr(blkaddr) &&
  			!f2fs_is_valid_blkaddr(sbi, blkaddr,
  					DATA_GENERIC_ENHANCE))
  			continue;
  
  		f2fs_invalidate_blocks(sbi, blkaddr);
  		if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
  			clear_inode_flag(dn->inode, FI_FIRST_BLOCK_WRITTEN);
  		nr_free++;
  	}
  
  	if (nr_free) {
  		pgoff_t fofs;
  		/*
  		 * once we invalidate valid blkaddr in range [ofs, ofs + count],
  		 * we will invalidate all blkaddr in the whole range.
  		 */
  		fofs = f2fs_start_bidx_of_node(ofs_of_node(dn->node_page),
  							dn->inode) + ofs;
  		f2fs_update_extent_cache_range(dn, fofs, 0, len);
  		dec_valid_block_count(sbi, dn->inode, nr_free);
  	}
  	dn->ofs_in_node = ofs;
  
  	f2fs_update_time(sbi, REQ_TIME);
  	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
  					 dn->ofs_in_node, nr_free);
  }
  
  void f2fs_truncate_data_blocks(struct dnode_of_data *dn)
  {
  	f2fs_truncate_data_blocks_range(dn, ADDRS_PER_BLOCK(dn->inode));
  }
  
  static int truncate_partial_data_page(struct inode *inode, u64 from,
  								bool cache_only)
  {
  	loff_t offset = from & (PAGE_SIZE - 1);
  	pgoff_t index = from >> PAGE_SHIFT;
  	struct address_space *mapping = inode->i_mapping;
  	struct page *page;
  
  	if (!offset && !cache_only)
  		return 0;
  
  	if (cache_only) {
  		page = find_lock_page(mapping, index);
  		if (page && PageUptodate(page))
  			goto truncate_out;
  		f2fs_put_page(page, 1);
  		return 0;
  	}
  
  	page = f2fs_get_lock_data_page(inode, index, true);
  	if (IS_ERR(page))
  		return PTR_ERR(page) == -ENOENT ? 0 : PTR_ERR(page);
  truncate_out:
  	f2fs_wait_on_page_writeback(page, DATA, true, true);
  	zero_user(page, offset, PAGE_SIZE - offset);
  
  	/* An encrypted inode should have a key and truncate the last page. */
  	f2fs_bug_on(F2FS_I_SB(inode), cache_only && IS_ENCRYPTED(inode));
  	if (!cache_only)
  		set_page_dirty(page);
  	f2fs_put_page(page, 1);
  	return 0;
  }
  
  int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct dnode_of_data dn;
  	pgoff_t free_from;
  	int count = 0, err = 0;
  	struct page *ipage;
  	bool truncate_page = false;
  
  	trace_f2fs_truncate_blocks_enter(inode, from);
  
  	free_from = (pgoff_t)F2FS_BLK_ALIGN(from);
  
  	if (free_from >= sbi->max_file_blocks)
  		goto free_partial;
  
  	if (lock)
  		f2fs_lock_op(sbi);
  
  	ipage = f2fs_get_node_page(sbi, inode->i_ino);
  	if (IS_ERR(ipage)) {
  		err = PTR_ERR(ipage);
  		goto out;
  	}
  
  	if (f2fs_has_inline_data(inode)) {
  		f2fs_truncate_inline_inode(inode, ipage, from);
  		f2fs_put_page(ipage, 1);
  		truncate_page = true;
  		goto out;
  	}
  
  	set_new_dnode(&dn, inode, ipage, NULL, 0);
  	err = f2fs_get_dnode_of_data(&dn, free_from, LOOKUP_NODE_RA);
  	if (err) {
  		if (err == -ENOENT)
  			goto free_next;
  		goto out;
  	}
  
  	count = ADDRS_PER_PAGE(dn.node_page, inode);
  
  	count -= dn.ofs_in_node;
  	f2fs_bug_on(sbi, count < 0);
  
  	if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
  		f2fs_truncate_data_blocks_range(&dn, count);
  		free_from += count;
  	}
  
  	f2fs_put_dnode(&dn);
  free_next:
  	err = f2fs_truncate_inode_blocks(inode, free_from);
  out:
  	if (lock)
  		f2fs_unlock_op(sbi);
  free_partial:
  	/* lastly zero out the first data page */
  	if (!err)
  		err = truncate_partial_data_page(inode, from, truncate_page);
  
  	trace_f2fs_truncate_blocks_exit(inode, err);
  	return err;
  }
  
  int f2fs_truncate(struct inode *inode)
  {
  	int err;
  
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
  		return -EIO;
  
  	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
  				S_ISLNK(inode->i_mode)))
  		return 0;
  
  	trace_f2fs_truncate(inode);
  
  	if (time_to_inject(F2FS_I_SB(inode), FAULT_TRUNCATE)) {
  		f2fs_show_injection_info(FAULT_TRUNCATE);
  		return -EIO;
  	}
  
  	/* we should check inline_data size */
  	if (!f2fs_may_inline_data(inode)) {
  		err = f2fs_convert_inline_inode(inode);
  		if (err)
  			return err;
  	}
  
  	err = f2fs_truncate_blocks(inode, i_size_read(inode), true);
  	if (err)
  		return err;
  
  	inode->i_mtime = inode->i_ctime = current_time(inode);
  	f2fs_mark_inode_dirty_sync(inode, false);
  	return 0;
  }
  
  int f2fs_getattr(struct vfsmount *mnt,
  			struct dentry *dentry, struct kstat *stat)
  {
  	struct inode *inode = d_inode(dentry);
  #if 0
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	struct f2fs_inode *ri;
  	unsigned int flags;
  
  	if (f2fs_has_extra_attr(inode) &&
  			f2fs_sb_has_inode_crtime(F2FS_I_SB(inode)) &&
  			F2FS_FITS_IN_INODE(ri, fi->i_extra_isize, i_crtime)) {
  		stat->result_mask |= STATX_BTIME;
  		stat->btime.tv_sec = fi->i_crtime.tv_sec;
  		stat->btime.tv_nsec = fi->i_crtime.tv_nsec;
  	}
  
  	flags = fi->i_flags;
  	if (flags & F2FS_APPEND_FL)
  		stat->attributes |= STATX_ATTR_APPEND;
  	if (IS_ENCRYPTED(inode))
  		stat->attributes |= STATX_ATTR_ENCRYPTED;
  	if (flags & F2FS_IMMUTABLE_FL)
  		stat->attributes |= STATX_ATTR_IMMUTABLE;
  	if (flags & F2FS_NODUMP_FL)
  		stat->attributes |= STATX_ATTR_NODUMP;
  
  	stat->attributes_mask |= (STATX_ATTR_APPEND |
  				  STATX_ATTR_ENCRYPTED |
  				  STATX_ATTR_IMMUTABLE |
  				  STATX_ATTR_NODUMP);
  #endif
  	generic_fillattr(inode, stat);
  
  	/* we need to show initial sectors used for inline_data/dentries */
  	if ((S_ISREG(inode->i_mode) && f2fs_has_inline_data(inode)) ||
  					f2fs_has_inline_dentry(inode))
  		stat->blocks += (stat->size + 511) >> 9;
  
  	return 0;
  }
  
  #ifdef CONFIG_F2FS_FS_POSIX_ACL
  static void __setattr_copy(struct inode *inode, const struct iattr *attr)
  {
  	unsigned int ia_valid = attr->ia_valid;
  
  	if (ia_valid & ATTR_UID)
  		inode->i_uid = attr->ia_uid;
  	if (ia_valid & ATTR_GID)
  		inode->i_gid = attr->ia_gid;
  	if (ia_valid & ATTR_ATIME)
  		inode->i_atime = timespec_trunc(attr->ia_atime,
  						inode->i_sb->s_time_gran);
  	if (ia_valid & ATTR_MTIME)
  		inode->i_mtime = timespec_trunc(attr->ia_mtime,
  						inode->i_sb->s_time_gran);
  	if (ia_valid & ATTR_CTIME)
  		inode->i_ctime = timespec_trunc(attr->ia_ctime,
  						inode->i_sb->s_time_gran);
  	if (ia_valid & ATTR_MODE) {
  		umode_t mode = attr->ia_mode;
  
  		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
  			mode &= ~S_ISGID;
  		set_acl_inode(inode, mode);
  	}
  }
  #else
  #define __setattr_copy setattr_copy
  #endif
  
  int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
  {
  	struct inode *inode = d_inode(dentry);
  	int err;
  
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
  		return -EIO;
  
  	err = setattr_prepare(dentry, attr);
  	if (err)
  		return err;
  
  	err = fscrypt_prepare_setattr(dentry, attr);
  	if (err)
  		return err;
  
  	if (is_quota_modification(inode, attr)) {
  		err = dquot_initialize(inode);
  		if (err)
  			return err;
  	}
  	if ((attr->ia_valid & ATTR_UID &&
  		!uid_eq(attr->ia_uid, inode->i_uid)) ||
  		(attr->ia_valid & ATTR_GID &&
  		!gid_eq(attr->ia_gid, inode->i_gid))) {
  		f2fs_lock_op(F2FS_I_SB(inode));
  		err = dquot_transfer(inode, attr);
  		if (err) {
  			set_sbi_flag(F2FS_I_SB(inode),
  					SBI_QUOTA_NEED_REPAIR);
  			f2fs_unlock_op(F2FS_I_SB(inode));
  			return err;
  		}
  		/*
  		 * update uid/gid under lock_op(), so that dquot and inode can
  		 * be updated atomically.
  		 */
  		if (attr->ia_valid & ATTR_UID)
  			inode->i_uid = attr->ia_uid;
  		if (attr->ia_valid & ATTR_GID)
  			inode->i_gid = attr->ia_gid;
  		f2fs_mark_inode_dirty_sync(inode, true);
  		f2fs_unlock_op(F2FS_I_SB(inode));
  	}
  
  	if (attr->ia_valid & ATTR_SIZE) {
  		bool to_smaller = (attr->ia_size <= i_size_read(inode));
  
  		down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  		down_write(&F2FS_I(inode)->i_mmap_sem);
  
  		truncate_setsize(inode, attr->ia_size);
  
  		if (to_smaller)
  			err = f2fs_truncate(inode);
  		/*
  		 * do not trim all blocks after i_size if target size is
  		 * larger than i_size.
  		 */
  		up_write(&F2FS_I(inode)->i_mmap_sem);
  		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  
  		if (err)
  			return err;
  
  		if (!to_smaller) {
  			/* should convert inline inode here */
  			if (!f2fs_may_inline_data(inode)) {
  				err = f2fs_convert_inline_inode(inode);
  				if (err)
  					return err;
  			}
  			inode->i_mtime = inode->i_ctime = current_time(inode);
  		}
  
  		down_write(&F2FS_I(inode)->i_sem);
  		F2FS_I(inode)->last_disk_size = i_size_read(inode);
  		up_write(&F2FS_I(inode)->i_sem);
  	}
  
  	__setattr_copy(inode, attr);
  
  	if (attr->ia_valid & ATTR_MODE) {
  		err = posix_acl_chmod(inode, f2fs_get_inode_mode(inode));
  		if (err || is_inode_flag_set(inode, FI_ACL_MODE)) {
  			inode->i_mode = F2FS_I(inode)->i_acl_mode;
  			clear_inode_flag(inode, FI_ACL_MODE);
  		}
  	}
  
  	/* file size may changed here */
  	f2fs_mark_inode_dirty_sync(inode, true);
  
  	/* inode change will produce dirty node pages flushed by checkpoint */
  	f2fs_balance_fs(F2FS_I_SB(inode), true);
  
  	return err;
  }
  
  const struct inode_operations f2fs_file_inode_operations = {
  	.getattr	= f2fs_getattr,
  	.setattr	= f2fs_setattr,
  	.get_acl	= f2fs_get_acl,
  	.set_acl	= f2fs_set_acl,
  #ifdef CONFIG_F2FS_FS_XATTR
  	.listxattr	= f2fs_listxattr,
  #endif
  	.fiemap		= f2fs_fiemap,
  };
  
  static int fill_zero(struct inode *inode, pgoff_t index,
  					loff_t start, loff_t len)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct page *page;
  
  	if (!len)
  		return 0;
  
  	f2fs_balance_fs(sbi, true);
  
  	f2fs_lock_op(sbi);
  	page = f2fs_get_new_data_page(inode, NULL, index, false);
  	f2fs_unlock_op(sbi);
  
  	if (IS_ERR(page))
  		return PTR_ERR(page);
  
  	f2fs_wait_on_page_writeback(page, DATA, true, true);
  	zero_user(page, start, len);
  	set_page_dirty(page);
  	f2fs_put_page(page, 1);
  	return 0;
  }
  
  int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
  {
  	int err;
  
  	while (pg_start < pg_end) {
  		struct dnode_of_data dn;
  		pgoff_t end_offset, count;
  
  		set_new_dnode(&dn, inode, NULL, NULL, 0);
  		err = f2fs_get_dnode_of_data(&dn, pg_start, LOOKUP_NODE);
  		if (err) {
  			if (err == -ENOENT) {
  				pg_start = f2fs_get_next_page_offset(&dn,
  								pg_start);
  				continue;
  			}
  			return err;
  		}
  
  		end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
  		count = min(end_offset - dn.ofs_in_node, pg_end - pg_start);
  
  		f2fs_bug_on(F2FS_I_SB(inode), count == 0 || count > end_offset);
  
  		f2fs_truncate_data_blocks_range(&dn, count);
  		f2fs_put_dnode(&dn);
  
  		pg_start += count;
  	}
  	return 0;
  }
  
  static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
  {
  	pgoff_t pg_start, pg_end;
  	loff_t off_start, off_end;
  	int ret;
  
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		return ret;
  
  	pg_start = ((unsigned long long) offset) >> PAGE_SHIFT;
  	pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT;
  
  	off_start = offset & (PAGE_SIZE - 1);
  	off_end = (offset + len) & (PAGE_SIZE - 1);
  
  	if (pg_start == pg_end) {
  		ret = fill_zero(inode, pg_start, off_start,
  						off_end - off_start);
  		if (ret)
  			return ret;
  	} else {
  		if (off_start) {
  			ret = fill_zero(inode, pg_start++, off_start,
  						PAGE_SIZE - off_start);
  			if (ret)
  				return ret;
  		}
  		if (off_end) {
  			ret = fill_zero(inode, pg_end, 0, off_end);
  			if (ret)
  				return ret;
  		}
  
  		if (pg_start < pg_end) {
  			struct address_space *mapping = inode->i_mapping;
  			loff_t blk_start, blk_end;
  			struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  
  			f2fs_balance_fs(sbi, true);
  
  			blk_start = (loff_t)pg_start << PAGE_SHIFT;
  			blk_end = (loff_t)pg_end << PAGE_SHIFT;
  
  			down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  			down_write(&F2FS_I(inode)->i_mmap_sem);
  
  			truncate_inode_pages_range(mapping, blk_start,
  					blk_end - 1);
  
  			f2fs_lock_op(sbi);
  			ret = f2fs_truncate_hole(inode, pg_start, pg_end);
  			f2fs_unlock_op(sbi);
  
  			up_write(&F2FS_I(inode)->i_mmap_sem);
  			up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  		}
  	}
  
  	return ret;
  }
  
  static int __read_out_blkaddrs(struct inode *inode, block_t *blkaddr,
  				int *do_replace, pgoff_t off, pgoff_t len)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct dnode_of_data dn;
  	int ret, done, i;
  
  next_dnode:
  	set_new_dnode(&dn, inode, NULL, NULL, 0);
  	ret = f2fs_get_dnode_of_data(&dn, off, LOOKUP_NODE_RA);
  	if (ret && ret != -ENOENT) {
  		return ret;
  	} else if (ret == -ENOENT) {
  		if (dn.max_level == 0)
  			return -ENOENT;
  		done = min((pgoff_t)ADDRS_PER_BLOCK(inode) - dn.ofs_in_node,
  									len);
  		blkaddr += done;
  		do_replace += done;
  		goto next;
  	}
  
  	done = min((pgoff_t)ADDRS_PER_PAGE(dn.node_page, inode) -
  							dn.ofs_in_node, len);
  	for (i = 0; i < done; i++, blkaddr++, do_replace++, dn.ofs_in_node++) {
  		*blkaddr = datablock_addr(dn.inode,
  					dn.node_page, dn.ofs_in_node);
  
  		if (__is_valid_data_blkaddr(*blkaddr) &&
  			!f2fs_is_valid_blkaddr(sbi, *blkaddr,
  					DATA_GENERIC_ENHANCE)) {
  			f2fs_put_dnode(&dn);
  			return -EFSCORRUPTED;
  		}
  
  		if (!f2fs_is_checkpointed_data(sbi, *blkaddr)) {
  
  			if (test_opt(sbi, LFS)) {
  				f2fs_put_dnode(&dn);
  				return -ENOTSUPP;
  			}
  
  			/* do not invalidate this block address */
  			f2fs_update_data_blkaddr(&dn, NULL_ADDR);
  			*do_replace = 1;
  		}
  	}
  	f2fs_put_dnode(&dn);
  next:
  	len -= done;
  	off += done;
  	if (len)
  		goto next_dnode;
  	return 0;
  }
  
  static int __roll_back_blkaddrs(struct inode *inode, block_t *blkaddr,
  				int *do_replace, pgoff_t off, int len)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct dnode_of_data dn;
  	int ret, i;
  
  	for (i = 0; i < len; i++, do_replace++, blkaddr++) {
  		if (*do_replace == 0)
  			continue;
  
  		set_new_dnode(&dn, inode, NULL, NULL, 0);
  		ret = f2fs_get_dnode_of_data(&dn, off + i, LOOKUP_NODE_RA);
  		if (ret) {
  			dec_valid_block_count(sbi, inode, 1);
  			f2fs_invalidate_blocks(sbi, *blkaddr);
  		} else {
  			f2fs_update_data_blkaddr(&dn, *blkaddr);
  		}
  		f2fs_put_dnode(&dn);
  	}
  	return 0;
  }
  
  static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_inode,
  			block_t *blkaddr, int *do_replace,
  			pgoff_t src, pgoff_t dst, pgoff_t len, bool full)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(src_inode);
  	pgoff_t i = 0;
  	int ret;
  
  	while (i < len) {
  		if (blkaddr[i] == NULL_ADDR && !full) {
  			i++;
  			continue;
  		}
  
  		if (do_replace[i] || blkaddr[i] == NULL_ADDR) {
  			struct dnode_of_data dn;
  			struct node_info ni;
  			size_t new_size;
  			pgoff_t ilen;
  
  			set_new_dnode(&dn, dst_inode, NULL, NULL, 0);
  			ret = f2fs_get_dnode_of_data(&dn, dst + i, ALLOC_NODE);
  			if (ret)
  				return ret;
  
  			ret = f2fs_get_node_info(sbi, dn.nid, &ni);
  			if (ret) {
  				f2fs_put_dnode(&dn);
  				return ret;
  			}
  
  			ilen = min((pgoff_t)
  				ADDRS_PER_PAGE(dn.node_page, dst_inode) -
  						dn.ofs_in_node, len - i);
  			do {
  				dn.data_blkaddr = datablock_addr(dn.inode,
  						dn.node_page, dn.ofs_in_node);
  				f2fs_truncate_data_blocks_range(&dn, 1);
  
  				if (do_replace[i]) {
  					f2fs_i_blocks_write(src_inode,
  							1, false, false);
  					f2fs_i_blocks_write(dst_inode,
  							1, true, false);
  					f2fs_replace_block(sbi, &dn, dn.data_blkaddr,
  					blkaddr[i], ni.version, true, false);
  
  					do_replace[i] = 0;
  				}
  				dn.ofs_in_node++;
  				i++;
  				new_size = (loff_t)(dst + i) << PAGE_SHIFT;
  				if (dst_inode->i_size < new_size)
  					f2fs_i_size_write(dst_inode, new_size);
  			} while (--ilen && (do_replace[i] || blkaddr[i] == NULL_ADDR));
  
  			f2fs_put_dnode(&dn);
  		} else {
  			struct page *psrc, *pdst;
  
  			psrc = f2fs_get_lock_data_page(src_inode,
  							src + i, true);
  			if (IS_ERR(psrc))
  				return PTR_ERR(psrc);
  			pdst = f2fs_get_new_data_page(dst_inode, NULL, dst + i,
  								true);
  			if (IS_ERR(pdst)) {
  				f2fs_put_page(psrc, 1);
  				return PTR_ERR(pdst);
  			}
  			f2fs_copy_page(psrc, pdst);
  			set_page_dirty(pdst);
  			f2fs_put_page(pdst, 1);
  			f2fs_put_page(psrc, 1);
  
  			ret = f2fs_truncate_hole(src_inode,
  						src + i, src + i + 1);
  			if (ret)
  				return ret;
  			i++;
  		}
  	}
  	return 0;
  }
  
  static int __exchange_data_block(struct inode *src_inode,
  			struct inode *dst_inode, pgoff_t src, pgoff_t dst,
  			pgoff_t len, bool full)
  {
  	block_t *src_blkaddr;
  	int *do_replace;
  	pgoff_t olen;
  	int ret;
  
  	while (len) {
  		olen = min((pgoff_t)4 * ADDRS_PER_BLOCK(src_inode), len);
  
  		src_blkaddr = f2fs_kvzalloc(F2FS_I_SB(src_inode),
  					array_size(olen, sizeof(block_t)),
  					GFP_KERNEL);
  		if (!src_blkaddr)
  			return -ENOMEM;
  
  		do_replace = f2fs_kvzalloc(F2FS_I_SB(src_inode),
  					array_size(olen, sizeof(int)),
  					GFP_KERNEL);
  		if (!do_replace) {
  			kvfree(src_blkaddr);
  			return -ENOMEM;
  		}
  
  		ret = __read_out_blkaddrs(src_inode, src_blkaddr,
  					do_replace, src, olen);
  		if (ret)
  			goto roll_back;
  
  		ret = __clone_blkaddrs(src_inode, dst_inode, src_blkaddr,
  					do_replace, src, dst, olen, full);
  		if (ret)
  			goto roll_back;
  
  		src += olen;
  		dst += olen;
  		len -= olen;
  
  		kvfree(src_blkaddr);
  		kvfree(do_replace);
  	}
  	return 0;
  
  roll_back:
  	__roll_back_blkaddrs(src_inode, src_blkaddr, do_replace, src, olen);
  	kvfree(src_blkaddr);
  	kvfree(do_replace);
  	return ret;
  }
  
  static int f2fs_do_collapse(struct inode *inode, loff_t offset, loff_t len)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	pgoff_t nrpages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
  	pgoff_t start = offset >> PAGE_SHIFT;
  	pgoff_t end = (offset + len) >> PAGE_SHIFT;
  	int ret;
  
  	f2fs_balance_fs(sbi, true);
  
  	/* avoid gc operation during block exchange */
  	down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  	down_write(&F2FS_I(inode)->i_mmap_sem);
  
  	f2fs_lock_op(sbi);
  	f2fs_drop_extent_tree(inode);
  	truncate_pagecache(inode, offset);
  	ret = __exchange_data_block(inode, inode, end, start, nrpages - end, true);
  	f2fs_unlock_op(sbi);
  
  	up_write(&F2FS_I(inode)->i_mmap_sem);
  	up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  	return ret;
  }
  
  static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
  {
  	loff_t new_size;
  	int ret;
  
  	if (offset + len >= i_size_read(inode))
  		return -EINVAL;
  
  	/* collapse range should be aligned to block size of f2fs. */
  	if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
  		return -EINVAL;
  
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		return ret;
  
  	/* write out all dirty pages from offset */
  	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
  	if (ret)
  		return ret;
  
  	ret = f2fs_do_collapse(inode, offset, len);
  	if (ret)
  		return ret;
  
  	/* write out all moved pages, if possible */
  	down_write(&F2FS_I(inode)->i_mmap_sem);
  	filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
  	truncate_pagecache(inode, offset);
  
  	new_size = i_size_read(inode) - len;
  	truncate_pagecache(inode, new_size);
  
  	ret = f2fs_truncate_blocks(inode, new_size, true);
  	up_write(&F2FS_I(inode)->i_mmap_sem);
  	if (!ret)
  		f2fs_i_size_write(inode, new_size);
  	return ret;
  }
  
  static int f2fs_do_zero_range(struct dnode_of_data *dn, pgoff_t start,
  								pgoff_t end)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
  	pgoff_t index = start;
  	unsigned int ofs_in_node = dn->ofs_in_node;
  	blkcnt_t count = 0;
  	int ret;
  
  	for (; index < end; index++, dn->ofs_in_node++) {
  		if (datablock_addr(dn->inode, dn->node_page,
  					dn->ofs_in_node) == NULL_ADDR)
  			count++;
  	}
  
  	dn->ofs_in_node = ofs_in_node;
  	ret = f2fs_reserve_new_blocks(dn, count);
  	if (ret)
  		return ret;
  
  	dn->ofs_in_node = ofs_in_node;
  	for (index = start; index < end; index++, dn->ofs_in_node++) {
  		dn->data_blkaddr = datablock_addr(dn->inode,
  					dn->node_page, dn->ofs_in_node);
  		/*
  		 * f2fs_reserve_new_blocks will not guarantee entire block
  		 * allocation.
  		 */
  		if (dn->data_blkaddr == NULL_ADDR) {
  			ret = -ENOSPC;
  			break;
  		}
  		if (dn->data_blkaddr != NEW_ADDR) {
  			f2fs_invalidate_blocks(sbi, dn->data_blkaddr);
  			dn->data_blkaddr = NEW_ADDR;
  			f2fs_set_data_blkaddr(dn);
  		}
  	}
  
  	f2fs_update_extent_cache_range(dn, start, 0, index - start);
  
  	return ret;
  }
  
  static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
  								int mode)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct address_space *mapping = inode->i_mapping;
  	pgoff_t index, pg_start, pg_end;
  	loff_t new_size = i_size_read(inode);
  	loff_t off_start, off_end;
  	int ret = 0;
  
  	ret = inode_newsize_ok(inode, (len + offset));
  	if (ret)
  		return ret;
  
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		return ret;
  
  	ret = filemap_write_and_wait_range(mapping, offset, offset + len - 1);
  	if (ret)
  		return ret;
  
  	pg_start = ((unsigned long long) offset) >> PAGE_SHIFT;
  	pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT;
  
  	off_start = offset & (PAGE_SIZE - 1);
  	off_end = (offset + len) & (PAGE_SIZE - 1);
  
  	if (pg_start == pg_end) {
  		ret = fill_zero(inode, pg_start, off_start,
  						off_end - off_start);
  		if (ret)
  			return ret;
  
  		new_size = max_t(loff_t, new_size, offset + len);
  	} else {
  		if (off_start) {
  			ret = fill_zero(inode, pg_start++, off_start,
  						PAGE_SIZE - off_start);
  			if (ret)
  				return ret;
  
  			new_size = max_t(loff_t, new_size,
  					(loff_t)pg_start << PAGE_SHIFT);
  		}
  
  		for (index = pg_start; index < pg_end;) {
  			struct dnode_of_data dn;
  			unsigned int end_offset;
  			pgoff_t end;
  
  			down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  			down_write(&F2FS_I(inode)->i_mmap_sem);
  
  			truncate_pagecache_range(inode,
  				(loff_t)index << PAGE_SHIFT,
  				((loff_t)pg_end << PAGE_SHIFT) - 1);
  
  			f2fs_lock_op(sbi);
  
  			set_new_dnode(&dn, inode, NULL, NULL, 0);
  			ret = f2fs_get_dnode_of_data(&dn, index, ALLOC_NODE);
  			if (ret) {
  				f2fs_unlock_op(sbi);
  				up_write(&F2FS_I(inode)->i_mmap_sem);
  				up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  				goto out;
  			}
  
  			end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
  			end = min(pg_end, end_offset - dn.ofs_in_node + index);
  
  			ret = f2fs_do_zero_range(&dn, index, end);
  			f2fs_put_dnode(&dn);
  
  			f2fs_unlock_op(sbi);
  			up_write(&F2FS_I(inode)->i_mmap_sem);
  			up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  
  			f2fs_balance_fs(sbi, dn.node_changed);
  
  			if (ret)
  				goto out;
  
  			index = end;
  			new_size = max_t(loff_t, new_size,
  					(loff_t)index << PAGE_SHIFT);
  		}
  
  		if (off_end) {
  			ret = fill_zero(inode, pg_end, 0, off_end);
  			if (ret)
  				goto out;
  
  			new_size = max_t(loff_t, new_size, offset + len);
  		}
  	}
  
  out:
  	if (new_size > i_size_read(inode)) {
  		if (mode & FALLOC_FL_KEEP_SIZE)
  			file_set_keep_isize(inode);
  		else
  			f2fs_i_size_write(inode, new_size);
  	}
  	return ret;
  }
  
  static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	pgoff_t nr, pg_start, pg_end, delta, idx;
  	loff_t new_size;
  	int ret = 0;
  
  	new_size = i_size_read(inode) + len;
  	ret = inode_newsize_ok(inode, new_size);
  	if (ret)
  		return ret;
  
  	if (offset >= i_size_read(inode))
  		return -EINVAL;
  
  	/* insert range should be aligned to block size of f2fs. */
  	if (offset & (F2FS_BLKSIZE - 1) || len & (F2FS_BLKSIZE - 1))
  		return -EINVAL;
  
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		return ret;
  
  	f2fs_balance_fs(sbi, true);
  
  	down_write(&F2FS_I(inode)->i_mmap_sem);
  	ret = f2fs_truncate_blocks(inode, i_size_read(inode), true);
  	up_write(&F2FS_I(inode)->i_mmap_sem);
  	if (ret)
  		return ret;
  
  	/* write out all dirty pages from offset */
  	ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
  	if (ret)
  		return ret;
  
  	pg_start = offset >> PAGE_SHIFT;
  	pg_end = (offset + len) >> PAGE_SHIFT;
  	delta = pg_end - pg_start;
  	idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
  
  	/* avoid gc operation during block exchange */
  	down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  	down_write(&F2FS_I(inode)->i_mmap_sem);
  	truncate_pagecache(inode, offset);
  
  	while (!ret && idx > pg_start) {
  		nr = idx - pg_start;
  		if (nr > delta)
  			nr = delta;
  		idx -= nr;
  
  		f2fs_lock_op(sbi);
  		f2fs_drop_extent_tree(inode);
  
  		ret = __exchange_data_block(inode, inode, idx,
  					idx + delta, nr, false);
  		f2fs_unlock_op(sbi);
  	}
  	up_write(&F2FS_I(inode)->i_mmap_sem);
  	up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  
  	/* write out all moved pages, if possible */
  	down_write(&F2FS_I(inode)->i_mmap_sem);
  	filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
  	truncate_pagecache(inode, offset);
  	up_write(&F2FS_I(inode)->i_mmap_sem);
  
  	if (!ret)
  		f2fs_i_size_write(inode, new_size);
  	return ret;
  }
  
  static int expand_inode_data(struct inode *inode, loff_t offset,
  					loff_t len, int mode)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct f2fs_map_blocks map = { .m_next_pgofs = NULL,
  			.m_next_extent = NULL, .m_seg_type = NO_CHECK_TYPE,
  			.m_may_create = true };
  	pgoff_t pg_end;
  	loff_t new_size = i_size_read(inode);
  	loff_t off_end;
  	int err;
  
  	err = inode_newsize_ok(inode, (len + offset));
  	if (err)
  		return err;
  
  	err = f2fs_convert_inline_inode(inode);
  	if (err)
  		return err;
  
  	f2fs_balance_fs(sbi, true);
  
  	pg_end = ((unsigned long long)offset + len) >> PAGE_SHIFT;
  	off_end = (offset + len) & (PAGE_SIZE - 1);
  
  	map.m_lblk = ((unsigned long long)offset) >> PAGE_SHIFT;
  	map.m_len = pg_end - map.m_lblk;
  	if (off_end)
  		map.m_len++;
  
  	if (f2fs_is_pinned_file(inode))
  		map.m_seg_type = CURSEG_COLD_DATA;
  
  	err = f2fs_map_blocks(inode, &map, 1, (f2fs_is_pinned_file(inode) ?
  						F2FS_GET_BLOCK_PRE_DIO :
  						F2FS_GET_BLOCK_PRE_AIO));
  	if (err) {
  		pgoff_t last_off;
  
  		if (!map.m_len)
  			return err;
  
  		last_off = map.m_lblk + map.m_len - 1;
  
  		/* update new size to the failed position */
  		new_size = (last_off == pg_end) ? offset + len :
  					(loff_t)(last_off + 1) << PAGE_SHIFT;
  	} else {
  		new_size = ((loff_t)pg_end << PAGE_SHIFT) + off_end;
  	}
  
  	if (new_size > i_size_read(inode)) {
  		if (mode & FALLOC_FL_KEEP_SIZE)
  			file_set_keep_isize(inode);
  		else
  			f2fs_i_size_write(inode, new_size);
  	}
  
  	return err;
  }
  
  static long f2fs_fallocate(struct file *file, int mode,
  				loff_t offset, loff_t len)
  {
  	struct inode *inode = file_inode(file);
  	long ret = 0;
  
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
  		return -EIO;
  
  	/* f2fs only support ->fallocate for regular file */
  	if (!S_ISREG(inode->i_mode))
  		return -EINVAL;
  
  	if (IS_ENCRYPTED(inode) &&
  		(mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
  		return -EOPNOTSUPP;
  
  	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
  			FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
  			FALLOC_FL_INSERT_RANGE))
  		return -EOPNOTSUPP;
  
  	inode_lock(inode);
  
  	if (mode & FALLOC_FL_PUNCH_HOLE) {
  		if (offset >= inode->i_size)
  			goto out;
  
  		ret = punch_hole(inode, offset, len);
  	} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
  		ret = f2fs_collapse_range(inode, offset, len);
  	} else if (mode & FALLOC_FL_ZERO_RANGE) {
  		ret = f2fs_zero_range(inode, offset, len, mode);
  	} else if (mode & FALLOC_FL_INSERT_RANGE) {
  		ret = f2fs_insert_range(inode, offset, len);
  	} else {
  		ret = expand_inode_data(inode, offset, len, mode);
  	}
  
  	if (!ret) {
  		inode->i_mtime = inode->i_ctime = current_time(inode);
  		f2fs_mark_inode_dirty_sync(inode, false);
  		f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  	}
  
  out:
  	inode_unlock(inode);
  
  	trace_f2fs_fallocate(inode, mode, offset, len, ret);
  	return ret;
  }
  
  static int f2fs_release_file(struct inode *inode, struct file *filp)
  {
  	/*
  	 * f2fs_relase_file is called at every close calls. So we should
  	 * not drop any inmemory pages by close called by other process.
  	 */
  	if (!(filp->f_mode & FMODE_WRITE) ||
  			atomic_read(&inode->i_writecount) != 1)
  		return 0;
  
  	/* some remained atomic pages should discarded */
  	if (f2fs_is_atomic_file(inode))
  		f2fs_drop_inmem_pages(inode);
  	if (f2fs_is_volatile_file(inode)) {
  		set_inode_flag(inode, FI_DROP_CACHE);
  		filemap_fdatawrite(inode->i_mapping);
  		clear_inode_flag(inode, FI_DROP_CACHE);
  		clear_inode_flag(inode, FI_VOLATILE_FILE);
  		stat_dec_volatile_write(inode);
  	}
  	return 0;
  }
  
  static int f2fs_file_flush(struct file *file, fl_owner_t id)
  {
  	struct inode *inode = file_inode(file);
  
  	/*
  	 * If the process doing a transaction is crashed, we should do
  	 * roll-back. Otherwise, other reader/write can see corrupted database
  	 * until all the writers close its file. Since this should be done
  	 * before dropping file lock, it needs to do in ->flush.
  	 */
  	if (f2fs_is_atomic_file(inode) &&
  			F2FS_I(inode)->inmem_task == current)
  		f2fs_drop_inmem_pages(inode);
  	return 0;
  }
  
  static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
  {
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  
  	/* Is it quota file? Do not allow user to mess with it */
  	if (IS_NOQUOTA(inode))
  		return -EPERM;
  
  	fi->i_flags = iflags | (fi->i_flags & ~mask);
  
  	if (fi->i_flags & F2FS_PROJINHERIT_FL)
  		set_inode_flag(inode, FI_PROJ_INHERIT);
  	else
  		clear_inode_flag(inode, FI_PROJ_INHERIT);
  
  	inode->i_ctime = current_time(inode);
  	f2fs_set_inode_flags(inode);
  	f2fs_mark_inode_dirty_sync(inode, true);
  	return 0;
  }
  
  /* FS_IOC_GETFLAGS and FS_IOC_SETFLAGS support */
  
  /*
   * To make a new on-disk f2fs i_flag gettable via FS_IOC_GETFLAGS, add an entry
   * for it to f2fs_fsflags_map[], and add its FS_*_FL equivalent to
   * F2FS_GETTABLE_FS_FL.  To also make it settable via FS_IOC_SETFLAGS, also add
   * its FS_*_FL equivalent to F2FS_SETTABLE_FS_FL.
   */
  
  static const struct {
  	u32 iflag;
  	u32 fsflag;
  } f2fs_fsflags_map[] = {
  	{ F2FS_SYNC_FL,		FS_SYNC_FL },
  	{ F2FS_IMMUTABLE_FL,	FS_IMMUTABLE_FL },
  	{ F2FS_APPEND_FL,	FS_APPEND_FL },
  	{ F2FS_NODUMP_FL,	FS_NODUMP_FL },
  	{ F2FS_NOATIME_FL,	FS_NOATIME_FL },
  	{ F2FS_INDEX_FL,	FS_INDEX_FL },
  	{ F2FS_DIRSYNC_FL,	FS_DIRSYNC_FL },
  	{ F2FS_PROJINHERIT_FL,	FS_PROJINHERIT_FL },
  };
  
  #define F2FS_GETTABLE_FS_FL (		\
  		FS_SYNC_FL |		\
  		FS_IMMUTABLE_FL |	\
  		FS_APPEND_FL |		\
  		FS_NODUMP_FL |		\
  		FS_NOATIME_FL |		\
  		FS_INDEX_FL |		\
  		FS_DIRSYNC_FL |		\
  		FS_PROJINHERIT_FL |	\
  		FS_ENCRYPT_FL |		\
  		FS_INLINE_DATA_FL |	\
  		FS_NOCOW_FL)
  
  #define F2FS_SETTABLE_FS_FL (		\
  		FS_SYNC_FL |		\
  		FS_IMMUTABLE_FL |	\
  		FS_APPEND_FL |		\
  		FS_NODUMP_FL |		\
  		FS_NOATIME_FL |		\
  		FS_DIRSYNC_FL |		\
  		FS_PROJINHERIT_FL)
  
  /* Convert f2fs on-disk i_flags to FS_IOC_{GET,SET}FLAGS flags */
  static inline u32 f2fs_iflags_to_fsflags(u32 iflags)
  {
  	u32 fsflags = 0;
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(f2fs_fsflags_map); i++)
  		if (iflags & f2fs_fsflags_map[i].iflag)
  			fsflags |= f2fs_fsflags_map[i].fsflag;
  
  	return fsflags;
  }
  
  /* Convert FS_IOC_{GET,SET}FLAGS flags to f2fs on-disk i_flags */
  static inline u32 f2fs_fsflags_to_iflags(u32 fsflags)
  {
  	u32 iflags = 0;
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(f2fs_fsflags_map); i++)
  		if (fsflags & f2fs_fsflags_map[i].fsflag)
  			iflags |= f2fs_fsflags_map[i].iflag;
  
  	return iflags;
  }
  
  static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	u32 fsflags = f2fs_iflags_to_fsflags(fi->i_flags);
  
  	if (IS_ENCRYPTED(inode))
  		fsflags |= FS_ENCRYPT_FL;
  	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode))
  		fsflags |= FS_INLINE_DATA_FL;
  	if (is_inode_flag_set(inode, FI_PIN_FILE))
  		fsflags |= FS_NOCOW_FL;
  
  	fsflags &= F2FS_GETTABLE_FS_FL;
  
  	return put_user(fsflags, (int __user *)arg);
  }
  
  static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	u32 fsflags, old_fsflags;
  	u32 iflags;
  	int ret;
  
  	if (!inode_owner_or_capable(inode))
  		return -EACCES;
  
  	if (get_user(fsflags, (int __user *)arg))
  		return -EFAULT;
  
  	if (fsflags & ~F2FS_GETTABLE_FS_FL)
  		return -EOPNOTSUPP;
  	fsflags &= F2FS_SETTABLE_FS_FL;
  
  	iflags = f2fs_fsflags_to_iflags(fsflags);
  	if (f2fs_mask_flags(inode->i_mode, iflags) != iflags)
  		return -EOPNOTSUPP;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	inode_lock(inode);
  
  	old_fsflags = f2fs_iflags_to_fsflags(fi->i_flags);
  	ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags);
  	if (ret)
  		goto out;
  
  	ret = f2fs_setflags_common(inode, iflags,
  			f2fs_fsflags_to_iflags(F2FS_SETTABLE_FS_FL));
  out:
  	inode_unlock(inode);
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  
  	return put_user(inode->i_generation, (int __user *)arg);
  }
  
  static int f2fs_ioc_start_atomic_write(struct file *filp)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	int ret;
  
  	if (!inode_owner_or_capable(inode))
  		return -EACCES;
  
  	if (!S_ISREG(inode->i_mode))
  		return -EINVAL;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	inode_lock(inode);
  
  	if (f2fs_is_atomic_file(inode)) {
  		if (is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST))
  			ret = -EINVAL;
  		goto out;
  	}
  
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		goto out;
  
  	down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  
  	/*
  	 * Should wait end_io to count F2FS_WB_CP_DATA correctly by
  	 * f2fs_is_atomic_file.
  	 */
  	if (get_dirty_pages(inode))
  		f2fs_warn(F2FS_I_SB(inode), "Unexpected flush for atomic writes: ino=%lu, npages=%u",
  			  inode->i_ino, get_dirty_pages(inode));
  	ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
  	if (ret) {
  		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  		goto out;
  	}
  
  	spin_lock(&sbi->inode_lock[ATOMIC_FILE]);
  	if (list_empty(&fi->inmem_ilist))
  		list_add_tail(&fi->inmem_ilist, &sbi->inode_list[ATOMIC_FILE]);
  	spin_unlock(&sbi->inode_lock[ATOMIC_FILE]);
  
  	/* add inode in inmem_list first and set atomic_file */
  	set_inode_flag(inode, FI_ATOMIC_FILE);
  	clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
  	up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
  
  	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  	F2FS_I(inode)->inmem_task = current;
  	stat_inc_atomic_write(inode);
  	stat_update_max_atomic_write(inode);
  out:
  	inode_unlock(inode);
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_commit_atomic_write(struct file *filp)
  {
  	struct inode *inode = file_inode(filp);
  	int ret;
  
  	if (!inode_owner_or_capable(inode))
  		return -EACCES;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	f2fs_balance_fs(F2FS_I_SB(inode), true);
  
  	inode_lock(inode);
  
  	if (f2fs_is_volatile_file(inode)) {
  		ret = -EINVAL;
  		goto err_out;
  	}
  
  	if (f2fs_is_atomic_file(inode)) {
  		ret = f2fs_commit_inmem_pages(inode);
  		if (ret)
  			goto err_out;
  
  		ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
  		if (!ret)
  			f2fs_drop_inmem_pages(inode);
  	} else {
  		ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 1, false);
  	}
  err_out:
  	if (is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST)) {
  		clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
  		ret = -EINVAL;
  	}
  	inode_unlock(inode);
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_start_volatile_write(struct file *filp)
  {
  	struct inode *inode = file_inode(filp);
  	int ret;
  
  	if (!inode_owner_or_capable(inode))
  		return -EACCES;
  
  	if (!S_ISREG(inode->i_mode))
  		return -EINVAL;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	inode_lock(inode);
  
  	if (f2fs_is_volatile_file(inode))
  		goto out;
  
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		goto out;
  
  	stat_inc_volatile_write(inode);
  	stat_update_max_volatile_write(inode);
  
  	set_inode_flag(inode, FI_VOLATILE_FILE);
  	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  out:
  	inode_unlock(inode);
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_release_volatile_write(struct file *filp)
  {
  	struct inode *inode = file_inode(filp);
  	int ret;
  
  	if (!inode_owner_or_capable(inode))
  		return -EACCES;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	inode_lock(inode);
  
  	if (!f2fs_is_volatile_file(inode))
  		goto out;
  
  	if (!f2fs_is_first_block_written(inode)) {
  		ret = truncate_partial_data_page(inode, 0, true);
  		goto out;
  	}
  
  	ret = punch_hole(inode, 0, F2FS_BLKSIZE);
  out:
  	inode_unlock(inode);
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_abort_volatile_write(struct file *filp)
  {
  	struct inode *inode = file_inode(filp);
  	int ret;
  
  	if (!inode_owner_or_capable(inode))
  		return -EACCES;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	inode_lock(inode);
  
  	if (f2fs_is_atomic_file(inode))
  		f2fs_drop_inmem_pages(inode);
  	if (f2fs_is_volatile_file(inode)) {
  		clear_inode_flag(inode, FI_VOLATILE_FILE);
  		stat_dec_volatile_write(inode);
  		ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
  	}
  
  	clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
  
  	inode_unlock(inode);
  
  	mnt_drop_write_file(filp);
  	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  	return ret;
  }
  
  static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct super_block *sb = sbi->sb;
  	__u32 in;
  	int ret = 0;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (get_user(in, (__u32 __user *)arg))
  		return -EFAULT;
  
  	if (in != F2FS_GOING_DOWN_FULLSYNC) {
  		ret = mnt_want_write_file(filp);
  		if (ret)
  			return ret;
  	}
  
  	switch (in) {
  	case F2FS_GOING_DOWN_FULLSYNC:
  		sb = freeze_bdev(sb->s_bdev);
  		if (IS_ERR(sb)) {
  			ret = PTR_ERR(sb);
  			goto out;
  		}
  		if (sb) {
  			f2fs_stop_checkpoint(sbi, false);
  			set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
  			thaw_bdev(sb->s_bdev, sb);
  		}
  		break;
  	case F2FS_GOING_DOWN_METASYNC:
  		/* do checkpoint only */
  		ret = f2fs_sync_fs(sb, 1);
  		if (ret)
  			goto out;
  		f2fs_stop_checkpoint(sbi, false);
  		set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
  		break;
  	case F2FS_GOING_DOWN_NOSYNC:
  		f2fs_stop_checkpoint(sbi, false);
  		set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
  		break;
  	case F2FS_GOING_DOWN_METAFLUSH:
  		f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_META_IO);
  		f2fs_stop_checkpoint(sbi, false);
  		set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
  		break;
  	case F2FS_GOING_DOWN_NEED_FSCK:
  		set_sbi_flag(sbi, SBI_NEED_FSCK);
  		set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
  		set_sbi_flag(sbi, SBI_IS_DIRTY);
  		/* do checkpoint only */
  		ret = f2fs_sync_fs(sb, 1);
  		goto out;
  	default:
  		ret = -EINVAL;
  		goto out;
  	}
  
  	f2fs_stop_gc_thread(sbi);
  	f2fs_stop_discard_thread(sbi);
  
  	f2fs_drop_discard_cmd(sbi);
  	clear_opt(sbi, DISCARD);
  
  	f2fs_update_time(sbi, REQ_TIME);
  out:
  	if (in != F2FS_GOING_DOWN_FULLSYNC)
  		mnt_drop_write_file(filp);
  
  	trace_f2fs_shutdown(sbi, in, ret);
  
  	return ret;
  }
  
  static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct super_block *sb = inode->i_sb;
  	struct request_queue *q = bdev_get_queue(sb->s_bdev);
  	struct fstrim_range range;
  	int ret;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (!f2fs_hw_support_discard(F2FS_SB(sb)))
  		return -EOPNOTSUPP;
  
  	if (copy_from_user(&range, (struct fstrim_range __user *)arg,
  				sizeof(range)))
  		return -EFAULT;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	range.minlen = max((unsigned int)range.minlen,
  				q->limits.discard_granularity);
  	ret = f2fs_trim_fs(F2FS_SB(sb), &range);
  	mnt_drop_write_file(filp);
  	if (ret < 0)
  		return ret;
  
  	if (copy_to_user((struct fstrim_range __user *)arg, &range,
  				sizeof(range)))
  		return -EFAULT;
  	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  	return 0;
  }
  
  static bool uuid_is_nonzero(__u8 u[16])
  {
  	int i;
  
  	for (i = 0; i < 16; i++)
  		if (u[i])
  			return true;
  	return false;
  }
  
  static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  
  	if (!f2fs_sb_has_encrypt(F2FS_I_SB(inode)))
  		return -EOPNOTSUPP;
  
  	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  
  	return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
  }
  
  static int f2fs_ioc_get_encryption_policy(struct file *filp, unsigned long arg)
  {
  	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
  		return -EOPNOTSUPP;
  	return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
  }
  
  static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	int err;
  
  	if (!f2fs_sb_has_encrypt(sbi))
  		return -EOPNOTSUPP;
  
  	err = mnt_want_write_file(filp);
  	if (err)
  		return err;
  
  	down_write(&sbi->sb_lock);
  
  	if (uuid_is_nonzero(sbi->raw_super->encrypt_pw_salt))
  		goto got_it;
  
  	/* update superblock with uuid */
  	generate_random_uuid(sbi->raw_super->encrypt_pw_salt);
  
  	err = f2fs_commit_super(sbi, false);
  	if (err) {
  		/* undo new data */
  		memset(sbi->raw_super->encrypt_pw_salt, 0, 16);
  		goto out_err;
  	}
  got_it:
  	if (copy_to_user((__u8 __user *)arg, sbi->raw_super->encrypt_pw_salt,
  									16))
  		err = -EFAULT;
  out_err:
  	up_write(&sbi->sb_lock);
  	mnt_drop_write_file(filp);
  	return err;
  }
  
  static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	__u32 sync;
  	int ret;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (get_user(sync, (__u32 __user *)arg))
  		return -EFAULT;
  
  	if (f2fs_readonly(sbi->sb))
  		return -EROFS;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	if (!sync) {
  		if (!mutex_trylock(&sbi->gc_mutex)) {
  			ret = -EBUSY;
  			goto out;
  		}
  	} else {
  		mutex_lock(&sbi->gc_mutex);
  	}
  
  	ret = f2fs_gc(sbi, sync, true, NULL_SEGNO);
  out:
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_gc_range(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct f2fs_gc_range range;
  	u64 end;
  	int ret;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (copy_from_user(&range, (struct f2fs_gc_range __user *)arg,
  							sizeof(range)))
  		return -EFAULT;
  
  	if (f2fs_readonly(sbi->sb))
  		return -EROFS;
  
  	end = range.start + range.len;
  	if (range.start < MAIN_BLKADDR(sbi) || end >= MAX_BLKADDR(sbi)) {
  		return -EINVAL;
  	}
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  do_more:
  	if (!range.sync) {
  		if (!mutex_trylock(&sbi->gc_mutex)) {
  			ret = -EBUSY;
  			goto out;
  		}
  	} else {
  		mutex_lock(&sbi->gc_mutex);
  	}
  
  	ret = f2fs_gc(sbi, range.sync, true, GET_SEGNO(sbi, range.start));
  	range.start += BLKS_PER_SEC(sbi);
  	if (range.start <= end)
  		goto do_more;
  out:
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	int ret;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (f2fs_readonly(sbi->sb))
  		return -EROFS;
  
  	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
  		f2fs_info(sbi, "Skipping Checkpoint. Checkpoints currently disabled.");
  		return -EINVAL;
  	}
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	ret = f2fs_sync_fs(sbi->sb, 1);
  
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
  					struct file *filp,
  					struct f2fs_defragment *range)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_map_blocks map = { .m_next_extent = NULL,
  					.m_seg_type = NO_CHECK_TYPE ,
  					.m_may_create = false };
  	struct extent_info ei = {0, 0, 0};
  	pgoff_t pg_start, pg_end, next_pgofs;
  	unsigned int blk_per_seg = sbi->blocks_per_seg;
  	unsigned int total = 0, sec_num;
  	block_t blk_end = 0;
  	bool fragmented = false;
  	int err;
  
  	/* if in-place-update policy is enabled, don't waste time here */
  	if (f2fs_should_update_inplace(inode, NULL))
  		return -EINVAL;
  
  	pg_start = range->start >> PAGE_SHIFT;
  	pg_end = (range->start + range->len) >> PAGE_SHIFT;
  
  	f2fs_balance_fs(sbi, true);
  
  	inode_lock(inode);
  
  	/* writeback all dirty pages in the range */
  	err = filemap_write_and_wait_range(inode->i_mapping, range->start,
  						range->start + range->len - 1);
  	if (err)
  		goto out;
  
  	/*
  	 * lookup mapping info in extent cache, skip defragmenting if physical
  	 * block addresses are continuous.
  	 */
  	if (f2fs_lookup_extent_cache(inode, pg_start, &ei)) {
  		if (ei.fofs + ei.len >= pg_end)
  			goto out;
  	}
  
  	map.m_lblk = pg_start;
  	map.m_next_pgofs = &next_pgofs;
  
  	/*
  	 * lookup mapping info in dnode page cache, skip defragmenting if all
  	 * physical block addresses are continuous even if there are hole(s)
  	 * in logical blocks.
  	 */
  	while (map.m_lblk < pg_end) {
  		map.m_len = pg_end - map.m_lblk;
  		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
  		if (err)
  			goto out;
  
  		if (!(map.m_flags & F2FS_MAP_FLAGS)) {
  			map.m_lblk = next_pgofs;
  			continue;
  		}
  
  		if (blk_end && blk_end != map.m_pblk)
  			fragmented = true;
  
  		/* record total count of block that we're going to move */
  		total += map.m_len;
  
  		blk_end = map.m_pblk + map.m_len;
  
  		map.m_lblk += map.m_len;
  	}
  
  	if (!fragmented)
  		goto out;
  
  	sec_num = DIV_ROUND_UP(total, BLKS_PER_SEC(sbi));
  
  	/*
  	 * make sure there are enough free section for LFS allocation, this can
  	 * avoid defragment running in SSR mode when free section are allocated
  	 * intensively
  	 */
  	if (has_not_enough_free_secs(sbi, 0, sec_num)) {
  		err = -EAGAIN;
  		goto out;
  	}
  
  	map.m_lblk = pg_start;
  	map.m_len = pg_end - pg_start;
  	total = 0;
  
  	while (map.m_lblk < pg_end) {
  		pgoff_t idx;
  		int cnt = 0;
  
  do_map:
  		map.m_len = pg_end - map.m_lblk;
  		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_DEFAULT);
  		if (err)
  			goto clear_out;
  
  		if (!(map.m_flags & F2FS_MAP_FLAGS)) {
  			map.m_lblk = next_pgofs;
  			continue;
  		}
  
  		set_inode_flag(inode, FI_DO_DEFRAG);
  
  		idx = map.m_lblk;
  		while (idx < map.m_lblk + map.m_len && cnt < blk_per_seg) {
  			struct page *page;
  
  			page = f2fs_get_lock_data_page(inode, idx, true);
  			if (IS_ERR(page)) {
  				err = PTR_ERR(page);
  				goto clear_out;
  			}
  
  			set_page_dirty(page);
  			f2fs_put_page(page, 1);
  
  			idx++;
  			cnt++;
  			total++;
  		}
  
  		map.m_lblk = idx;
  
  		if (idx < pg_end && cnt < blk_per_seg)
  			goto do_map;
  
  		clear_inode_flag(inode, FI_DO_DEFRAG);
  
  		err = filemap_fdatawrite(inode->i_mapping);
  		if (err)
  			goto out;
  	}
  clear_out:
  	clear_inode_flag(inode, FI_DO_DEFRAG);
  out:
  	inode_unlock(inode);
  	if (!err)
  		range->len = (u64)total << PAGE_SHIFT;
  	return err;
  }
  
  static int f2fs_ioc_defragment(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct f2fs_defragment range;
  	int err;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (!S_ISREG(inode->i_mode) || f2fs_is_atomic_file(inode))
  		return -EINVAL;
  
  	if (f2fs_readonly(sbi->sb))
  		return -EROFS;
  
  	if (copy_from_user(&range, (struct f2fs_defragment __user *)arg,
  							sizeof(range)))
  		return -EFAULT;
  
  	/* verify alignment of offset & size */
  	if (range.start & (F2FS_BLKSIZE - 1) || range.len & (F2FS_BLKSIZE - 1))
  		return -EINVAL;
  
  	if (unlikely((range.start + range.len) >> PAGE_SHIFT >
  					sbi->max_file_blocks))
  		return -EINVAL;
  
  	err = mnt_want_write_file(filp);
  	if (err)
  		return err;
  
  	err = f2fs_defragment_range(sbi, filp, &range);
  	mnt_drop_write_file(filp);
  
  	f2fs_update_time(sbi, REQ_TIME);
  	if (err < 0)
  		return err;
  
  	if (copy_to_user((struct f2fs_defragment __user *)arg, &range,
  							sizeof(range)))
  		return -EFAULT;
  
  	return 0;
  }
  
  static int f2fs_move_file_range(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_ISREG(src->i_mode) || !S_ISREG(dst->i_mode))
  		return -EINVAL;
  
  	if (IS_ENCRYPTED(src) || IS_ENCRYPTED(dst))
  		return -EOPNOTSUPP;
  
  	if (src == dst) {
  		if (pos_in == pos_out)
  			return 0;
  		if (pos_out > pos_in && pos_out < pos_in + len)
  			return -EINVAL;
  	}
  
  	inode_lock(src);
  	if (src != dst) {
  		ret = -EBUSY;
  		if (!inode_trylock(dst))
  			goto out;
  	}
  
  	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);
  
  	down_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
  	if (src != dst) {
  		ret = -EBUSY;
  		if (!down_write_trylock(&F2FS_I(dst)->i_gc_rwsem[WRITE]))
  			goto out_src;
  	}
  
  	f2fs_lock_op(sbi);
  	ret = __exchange_data_block(src, dst, pos_in >> F2FS_BLKSIZE_BITS,
  				pos_out >> F2FS_BLKSIZE_BITS,
  				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);
  
  	if (src != dst)
  		up_write(&F2FS_I(dst)->i_gc_rwsem[WRITE]);
  out_src:
  	up_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
  out_unlock:
  	if (src != dst)
  		inode_unlock(dst);
  out:
  	inode_unlock(src);
  	return ret;
  }
  
  static int f2fs_ioc_move_range(struct file *filp, unsigned long arg)
  {
  	struct f2fs_move_range range;
  	struct fd dst;
  	int err;
  
  	if (!(filp->f_mode & FMODE_READ) ||
  			!(filp->f_mode & FMODE_WRITE))
  		return -EBADF;
  
  	if (copy_from_user(&range, (struct f2fs_move_range __user *)arg,
  							sizeof(range)))
  		return -EFAULT;
  
  	dst = fdget(range.dst_fd);
  	if (!dst.file)
  		return -EBADF;
  
  	if (!(dst.file->f_mode & FMODE_WRITE)) {
  		err = -EBADF;
  		goto err_out;
  	}
  
  	err = mnt_want_write_file(filp);
  	if (err)
  		goto err_out;
  
  	err = f2fs_move_file_range(filp, range.pos_in, dst.file,
  					range.pos_out, range.len);
  
  	mnt_drop_write_file(filp);
  	if (err)
  		goto err_out;
  
  	if (copy_to_user((struct f2fs_move_range __user *)arg,
  						&range, sizeof(range)))
  		err = -EFAULT;
  err_out:
  	fdput(dst);
  	return err;
  }
  
  static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  	struct sit_info *sm = SIT_I(sbi);
  	unsigned int start_segno = 0, end_segno = 0;
  	unsigned int dev_start_segno = 0, dev_end_segno = 0;
  	struct f2fs_flush_device range;
  	int ret;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (f2fs_readonly(sbi->sb))
  		return -EROFS;
  
  	if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
  		return -EINVAL;
  
  	if (copy_from_user(&range, (struct f2fs_flush_device __user *)arg,
  							sizeof(range)))
  		return -EFAULT;
  
  	if (!f2fs_is_multi_device(sbi) || sbi->s_ndevs - 1 <= range.dev_num ||
  			__is_large_section(sbi)) {
  		f2fs_warn(sbi, "Can't flush %u in %d for segs_per_sec %u != 1",
  			  range.dev_num, sbi->s_ndevs, sbi->segs_per_sec);
  		return -EINVAL;
  	}
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	if (range.dev_num != 0)
  		dev_start_segno = GET_SEGNO(sbi, FDEV(range.dev_num).start_blk);
  	dev_end_segno = GET_SEGNO(sbi, FDEV(range.dev_num).end_blk);
  
  	start_segno = sm->last_victim[FLUSH_DEVICE];
  	if (start_segno < dev_start_segno || start_segno >= dev_end_segno)
  		start_segno = dev_start_segno;
  	end_segno = min(start_segno + range.segments, dev_end_segno);
  
  	while (start_segno < end_segno) {
  		if (!mutex_trylock(&sbi->gc_mutex)) {
  			ret = -EBUSY;
  			goto out;
  		}
  		sm->last_victim[GC_CB] = end_segno + 1;
  		sm->last_victim[GC_GREEDY] = end_segno + 1;
  		sm->last_victim[ALLOC_NEXT] = end_segno + 1;
  		ret = f2fs_gc(sbi, true, true, start_segno);
  		if (ret == -EAGAIN)
  			ret = 0;
  		else if (ret < 0)
  			break;
  		start_segno++;
  	}
  out:
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_get_features(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	u32 sb_feature = le32_to_cpu(F2FS_I_SB(inode)->raw_super->feature);
  
  	/* Must validate to set it with SQLite behavior in Android. */
  	sb_feature |= F2FS_FEATURE_ATOMIC_WRITE;
  
  	return put_user(sb_feature, (u32 __user *)arg);
  }
  
  int f2fs_pin_file_control(struct inode *inode, bool inc)
  {
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  
  	/* Use i_gc_failures for normal file as a risk signal. */
  	if (inc)
  		f2fs_i_gc_failures_write(inode,
  				fi->i_gc_failures[GC_FAILURE_PIN] + 1);
  
  	if (fi->i_gc_failures[GC_FAILURE_PIN] > sbi->gc_pin_file_threshold) {
  		f2fs_warn(sbi, "%s: Enable GC = ino %lx after %x GC trials",
  			  __func__, inode->i_ino,
  			  fi->i_gc_failures[GC_FAILURE_PIN]);
  		clear_inode_flag(inode, FI_PIN_FILE);
  		return -EAGAIN;
  	}
  	return 0;
  }
  
  static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	__u32 pin;
  	int ret = 0;
  
  	if (get_user(pin, (__u32 __user *)arg))
  		return -EFAULT;
  
  	if (!S_ISREG(inode->i_mode))
  		return -EINVAL;
  
  	if (f2fs_readonly(F2FS_I_SB(inode)->sb))
  		return -EROFS;
  
  	ret = mnt_want_write_file(filp);
  	if (ret)
  		return ret;
  
  	inode_lock(inode);
  
  	if (f2fs_should_update_outplace(inode, NULL)) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	if (!pin) {
  		clear_inode_flag(inode, FI_PIN_FILE);
  		f2fs_i_gc_failures_write(inode, 0);
  		goto done;
  	}
  
  	if (f2fs_pin_file_control(inode, false)) {
  		ret = -EAGAIN;
  		goto out;
  	}
  	ret = f2fs_convert_inline_inode(inode);
  	if (ret)
  		goto out;
  
  	set_inode_flag(inode, FI_PIN_FILE);
  	ret = F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN];
  done:
  	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
  out:
  	inode_unlock(inode);
  	mnt_drop_write_file(filp);
  	return ret;
  }
  
  static int f2fs_ioc_get_pin_file(struct file *filp, unsigned long arg)
  {
  	struct inode *inode = file_inode(filp);
  	__u32 pin = 0;
  
  	if (is_inode_flag_set(inode, FI_PIN_FILE))
  		pin = F2FS_I(inode)->i_gc_failures[GC_FAILURE_PIN];
  	return put_user(pin, (u32 __user *)arg);
  }
  
  int f2fs_precache_extents(struct inode *inode)
  {
  	struct f2fs_inode_info *fi = F2FS_I(inode);
  	struct f2fs_map_blocks map;
  	pgoff_t m_next_extent;
  	loff_t end;
  	int err;
  
  	if (is_inode_flag_set(inode, FI_NO_EXTENT))
  		return -EOPNOTSUPP;
  
  	map.m_lblk = 0;
  	map.m_next_pgofs = NULL;
  	map.m_next_extent = &m_next_extent;
  	map.m_seg_type = NO_CHECK_TYPE;
  	map.m_may_create = false;
  	end = F2FS_I_SB(inode)->max_file_blocks;
  
  	while (map.m_lblk < end) {
  		map.m_len = end - map.m_lblk;
  
  		down_write(&fi->i_gc_rwsem[WRITE]);
  		err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_PRECACHE);
  		up_write(&fi->i_gc_rwsem[WRITE]);
  		if (err)
  			return err;
  
  		map.m_lblk = m_next_extent;
  	}
  
  	return err;
  }
  
  static int f2fs_ioc_precache_extents(struct file *filp, unsigned long arg)
  {
  	return f2fs_precache_extents(file_inode(filp));
  }
  
  static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg)
  {
  	struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
  	__u64 block_count;
  	int ret;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (f2fs_readonly(sbi->sb))
  		return -EROFS;
  
  	if (copy_from_user(&block_count, (void __user *)arg,
  			   sizeof(block_count)))
  		return -EFAULT;
  
  	ret = f2fs_resize_fs(sbi, block_count);
  
  	return ret;
  }
  
  long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  {
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
  		return -EIO;
  
  	switch (cmd) {
  	case F2FS_IOC_GETFLAGS:
  		return f2fs_ioc_getflags(filp, arg);
  	case F2FS_IOC_SETFLAGS:
  		return f2fs_ioc_setflags(filp, arg);
  	case F2FS_IOC_GETVERSION:
  		return f2fs_ioc_getversion(filp, arg);
  	case F2FS_IOC_START_ATOMIC_WRITE:
  		return f2fs_ioc_start_atomic_write(filp);
  	case F2FS_IOC_COMMIT_ATOMIC_WRITE:
  		return f2fs_ioc_commit_atomic_write(filp);
  	case F2FS_IOC_START_VOLATILE_WRITE:
  		return f2fs_ioc_start_volatile_write(filp);
  	case F2FS_IOC_RELEASE_VOLATILE_WRITE:
  		return f2fs_ioc_release_volatile_write(filp);
  	case F2FS_IOC_ABORT_VOLATILE_WRITE:
  		return f2fs_ioc_abort_volatile_write(filp);
  	case F2FS_IOC_SHUTDOWN:
  		return f2fs_ioc_shutdown(filp, arg);
  	case FITRIM:
  		return f2fs_ioc_fitrim(filp, arg);
  	case F2FS_IOC_SET_ENCRYPTION_POLICY:
  		return f2fs_ioc_set_encryption_policy(filp, arg);
  	case F2FS_IOC_GET_ENCRYPTION_POLICY:
  		return f2fs_ioc_get_encryption_policy(filp, arg);
  	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
  		return f2fs_ioc_get_encryption_pwsalt(filp, arg);
  	case F2FS_IOC_GARBAGE_COLLECT:
  		return f2fs_ioc_gc(filp, arg);
  	case F2FS_IOC_GARBAGE_COLLECT_RANGE:
  		return f2fs_ioc_gc_range(filp, arg);
  	case F2FS_IOC_WRITE_CHECKPOINT:
  		return f2fs_ioc_write_checkpoint(filp, arg);
  	case F2FS_IOC_DEFRAGMENT:
  		return f2fs_ioc_defragment(filp, arg);
  	case F2FS_IOC_MOVE_RANGE:
  		return f2fs_ioc_move_range(filp, arg);
  	case F2FS_IOC_FLUSH_DEVICE:
  		return f2fs_ioc_flush_device(filp, arg);
  	case F2FS_IOC_GET_FEATURES:
  		return f2fs_ioc_get_features(filp, arg);
  	case F2FS_IOC_GET_PIN_FILE:
  		return f2fs_ioc_get_pin_file(filp, arg);
  	case F2FS_IOC_SET_PIN_FILE:
  		return f2fs_ioc_set_pin_file(filp, arg);
  	case F2FS_IOC_PRECACHE_EXTENTS:
  		return f2fs_ioc_precache_extents(filp, arg);
  	case F2FS_IOC_RESIZE_FS:
  		return f2fs_ioc_resize_fs(filp, arg);
  	default:
  		return -ENOTTY;
  	}
  }
  
  static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
  {
  	struct file *file = iocb->ki_filp;
  	struct inode *inode = file_inode(file);
  	ssize_t ret;
  
  	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode)))) {
  		ret = -EIO;
  		goto out;
  	}
  
  	if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT)) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	if (!inode_trylock(inode)) {
  		if (iocb->ki_flags & IOCB_NOWAIT) {
  			ret = -EAGAIN;
  			goto out;
  		}
  		inode_lock(inode);
  	}
  
  	ret = generic_write_checks(iocb, from);
  	if (ret > 0) {
  		bool preallocated = false;
  		size_t target_size = 0;
  		int err;
  
  		if (iov_iter_fault_in_readable(from, iov_iter_count(from)))
  			set_inode_flag(inode, FI_NO_PREALLOC);
  
  		if ((iocb->ki_flags & IOCB_NOWAIT)) {
  			if (!f2fs_overwrite_io(inode, iocb->ki_pos,
  						iov_iter_count(from)) ||
  				f2fs_has_inline_data(inode) ||
  				f2fs_force_buffered_io(inode, iocb, from)) {
  				clear_inode_flag(inode, FI_NO_PREALLOC);
  				inode_unlock(inode);
  				ret = -EAGAIN;
  				goto out;
  			}
  		} else {
  			preallocated = true;
  			target_size = iocb->ki_pos + iov_iter_count(from);
  
  			err = f2fs_preallocate_blocks(iocb, from);
  			if (err) {
  				clear_inode_flag(inode, FI_NO_PREALLOC);
  				inode_unlock(inode);
  				ret = err;
  				goto out;
  			}
  		}
  		ret = __generic_file_write_iter(iocb, from);
  		clear_inode_flag(inode, FI_NO_PREALLOC);
  
  		/* if we couldn't write data, we should deallocate blocks. */
  		if (preallocated && i_size_read(inode) < target_size)
  			f2fs_truncate(inode);
  
  		if (ret > 0)
  			f2fs_update_iostat(F2FS_I_SB(inode), APP_WRITE_IO, ret);
  	}
  	inode_unlock(inode);
  out:
  	trace_f2fs_file_write_iter(inode, iocb->ki_pos,
  					iov_iter_count(from), ret);
  	if (ret > 0)
  		ret = generic_write_sync(iocb, ret);
  	return ret;
  }
  
  #ifdef CONFIG_COMPAT
  long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {
  	switch (cmd) {
  	case F2FS_IOC32_GETFLAGS:
  		cmd = F2FS_IOC_GETFLAGS;
  		break;
  	case F2FS_IOC32_SETFLAGS:
  		cmd = F2FS_IOC_SETFLAGS;
  		break;
  	case F2FS_IOC32_GETVERSION:
  		cmd = F2FS_IOC_GETVERSION;
  		break;
  	case F2FS_IOC_START_ATOMIC_WRITE:
  	case F2FS_IOC_COMMIT_ATOMIC_WRITE:
  	case F2FS_IOC_START_VOLATILE_WRITE:
  	case F2FS_IOC_RELEASE_VOLATILE_WRITE:
  	case F2FS_IOC_ABORT_VOLATILE_WRITE:
  	case F2FS_IOC_SHUTDOWN:
  	case F2FS_IOC_SET_ENCRYPTION_POLICY:
  	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
  	case F2FS_IOC_GET_ENCRYPTION_POLICY:
  	case F2FS_IOC_GARBAGE_COLLECT:
  	case F2FS_IOC_GARBAGE_COLLECT_RANGE:
  	case F2FS_IOC_WRITE_CHECKPOINT:
  	case F2FS_IOC_DEFRAGMENT:
  	case F2FS_IOC_MOVE_RANGE:
  	case F2FS_IOC_FLUSH_DEVICE:
  	case F2FS_IOC_GET_FEATURES:
  	case F2FS_IOC_GET_PIN_FILE:
  	case F2FS_IOC_SET_PIN_FILE:
  	case F2FS_IOC_PRECACHE_EXTENTS:
  	case F2FS_IOC_RESIZE_FS:
  		break;
  	default:
  		return -ENOIOCTLCMD;
  	}
  	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
  }
  #endif
  
  const struct file_operations f2fs_file_operations = {
  	.llseek		= f2fs_llseek,
  	.read_iter	= generic_file_read_iter,
  	.write_iter	= f2fs_file_write_iter,
  	.open		= f2fs_file_open,
  	.release	= f2fs_release_file,
  	.mmap		= f2fs_file_mmap,
  	.flush		= f2fs_file_flush,
  	.fsync		= f2fs_sync_file,
  	.fallocate	= f2fs_fallocate,
  	.unlocked_ioctl	= f2fs_ioctl,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl	= f2fs_compat_ioctl,
  #endif
  	.splice_read	= generic_file_splice_read,
  	.splice_write	= iter_file_splice_write,
  };
  