[linux-2.6-block.git] / fs / f2fs / file.c

/*
 * fs/f2fs/file.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/stat.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/falloc.h>
#include <linux/types.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/mount.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"

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_SB(inode->i_sb);
	block_t old_blk_addr;
	struct dnode_of_data dn;
	int err;

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);

	mutex_lock_op(sbi, DATA_NEW);

	/* block allocation */
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, page->index, 0);
	if (err) {
		mutex_unlock_op(sbi, DATA_NEW);
		goto out;
	}

	old_blk_addr = dn.data_blkaddr;

	if (old_blk_addr == NULL_ADDR) {
		err = reserve_new_block(&dn);
		if (err) {
			f2fs_put_dnode(&dn);
			mutex_unlock_op(sbi, DATA_NEW);
			goto out;
		}
	}
	f2fs_put_dnode(&dn);

	mutex_unlock_op(sbi, DATA_NEW);

	lock_page(page);
	if (page->mapping != inode->i_mapping ||
			page_offset(page) >= i_size_read(inode) ||
			!PageUptodate(page)) {
		unlock_page(page);
		err = -EFAULT;
		goto out;
	}

	/*
	 * check to see if the page is mapped already (no holes)
	 */
	if (PageMappedToDisk(page))
		goto out;

	/* fill the page */
	wait_on_page_writeback(page);

	/* page is wholly or partially inside EOF */
	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
		unsigned offset;
		offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
		zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	}
	set_page_dirty(page);
	SetPageUptodate(page);

	file_update_time(vma->vm_file);
out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(err);
}

static const struct vm_operations_struct f2fs_file_vm_ops = {
	.fault		= filemap_fault,
	.page_mkwrite	= f2fs_vm_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
};

static int need_to_sync_dir(struct f2fs_sb_info *sbi, struct inode *inode)
{
	struct dentry *dentry;
	nid_t pino;

	inode = igrab(inode);
	dentry = d_find_any_alias(inode);
	if (!dentry) {
		iput(inode);
		return 0;
	}
	pino = dentry->d_parent->d_inode->i_ino;
	dput(dentry);
	iput(inode);
	return !is_checkpointed_node(sbi, pino);
}

int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	unsigned long long cur_version;
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
		.sync_mode = WB_SYNC_ALL,
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
	};

	if (inode->i_sb->s_flags & MS_RDONLY)
		return 0;

	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret)
		return ret;

	/* guarantee free sections for fsync */
	f2fs_balance_fs(sbi);

	mutex_lock(&inode->i_mutex);

	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
		goto out;

	mutex_lock(&sbi->cp_mutex);
	cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver);
	mutex_unlock(&sbi->cp_mutex);

	if (F2FS_I(inode)->data_version != cur_version &&
					!(inode->i_state & I_DIRTY))
		goto out;
	F2FS_I(inode)->data_version--;

	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
		need_cp = true;
	else if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP))
		need_cp = true;
	else if (!space_for_roll_forward(sbi))
		need_cp = true;
	else if (need_to_sync_dir(sbi, inode))
		need_cp = true;

	if (need_cp) {
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
		clear_inode_flag(F2FS_I(inode), FI_NEED_CP);
	} else {
		/* if there is no written node page, write its inode page */
		while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		}
		filemap_fdatawait_range(sbi->node_inode->i_mapping,
							0, LONG_MAX);
	}
out:
	mutex_unlock(&inode->i_mutex);
	return ret;
}

static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	file_accessed(file);
	vma->vm_ops = &f2fs_file_vm_ops;
	return 0;
}

static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
{
	int nr_free = 0, ofs = dn->ofs_in_node;
	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	struct f2fs_node *raw_node;
	__le32 *addr;

	raw_node = page_address(dn->node_page);
	addr = blkaddr_in_node(raw_node) + ofs;

	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
		block_t blkaddr = le32_to_cpu(*addr);
		if (blkaddr == NULL_ADDR)
			continue;

		update_extent_cache(NULL_ADDR, dn);
		invalidate_blocks(sbi, blkaddr);
		dec_valid_block_count(sbi, dn->inode, 1);
		nr_free++;
	}
	if (nr_free) {
		set_page_dirty(dn->node_page);
		sync_inode_page(dn);
	}
	dn->ofs_in_node = ofs;
	return nr_free;
}

void truncate_data_blocks(struct dnode_of_data *dn)
{
	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
}

static void truncate_partial_data_page(struct inode *inode, u64 from)
{
	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	struct page *page;

	if (!offset)
		return;

	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT);
	if (IS_ERR(page))
		return;

	lock_page(page);
	wait_on_page_writeback(page);
	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	set_page_dirty(page);
	f2fs_put_page(page, 1);
}

static int truncate_blocks(struct inode *inode, u64 from)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
	int count = 0;
	int err;

	free_from = (pgoff_t)
			((from + blocksize - 1) >> (sbi->log_blocksize));

	mutex_lock_op(sbi, DATA_TRUNC);

	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, free_from, RDONLY_NODE);
	if (err) {
		if (err == -ENOENT)
			goto free_next;
		mutex_unlock_op(sbi, DATA_TRUNC);
		return err;
	}

	if (IS_INODE(dn.node_page))
		count = ADDRS_PER_INODE;
	else
		count = ADDRS_PER_BLOCK;

	count -= dn.ofs_in_node;
	BUG_ON(count < 0);
	if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
		truncate_data_blocks_range(&dn, count);
		free_from += count;
	}

	f2fs_put_dnode(&dn);
free_next:
	err = truncate_inode_blocks(inode, free_from);
	mutex_unlock_op(sbi, DATA_TRUNC);

	/* lastly zero out the first data page */
	truncate_partial_data_page(inode, from);

	return err;
}

void f2fs_truncate(struct inode *inode)
{
	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
				S_ISLNK(inode->i_mode)))
		return;

	if (!truncate_blocks(inode, i_size_read(inode))) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
}

static int f2fs_getattr(struct vfsmount *mnt,
			 struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	generic_fillattr(inode, stat);
	stat->blocks <<= 3;
	return 0;
}

#ifdef CONFIG_F2FS_FS_POSIX_ACL
static void __setattr_copy(struct inode *inode, const struct iattr *attr)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	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(fi, mode);
	}
}
#else
#define __setattr_copy setattr_copy
#endif

int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	struct f2fs_inode_info *fi = F2FS_I(inode);
	int err;

	err = inode_change_ok(inode, attr);
	if (err)
		return err;

	if ((attr->ia_valid & ATTR_SIZE) &&
			attr->ia_size != i_size_read(inode)) {
		truncate_setsize(inode, attr->ia_size);
		f2fs_truncate(inode);
		f2fs_balance_fs(F2FS_SB(inode->i_sb));
	}

	__setattr_copy(inode, attr);

	if (attr->ia_valid & ATTR_MODE) {
		err = f2fs_acl_chmod(inode);
		if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
			inode->i_mode = fi->i_acl_mode;
			clear_inode_flag(fi, FI_ACL_MODE);
		}
	}

	mark_inode_dirty(inode);
	return err;
}

const struct inode_operations f2fs_file_inode_operations = {
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

static void fill_zero(struct inode *inode, pgoff_t index,
					loff_t start, loff_t len)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	struct page *page;

	if (!len)
		return;

	f2fs_balance_fs(sbi);

	mutex_lock_op(sbi, DATA_NEW);
	page = get_new_data_page(inode, index, false);
	mutex_unlock_op(sbi, DATA_NEW);

	if (!IS_ERR(page)) {
		wait_on_page_writeback(page);
		zero_user(page, start, len);
		set_page_dirty(page);
		f2fs_put_page(page, 1);
	}
}

int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
{
	pgoff_t index;
	int err;

	for (index = pg_start; index < pg_end; index++) {
		struct dnode_of_data dn;
		struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);

		f2fs_balance_fs(sbi);

		mutex_lock_op(sbi, DATA_TRUNC);
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, index, RDONLY_NODE);
		if (err) {
			mutex_unlock_op(sbi, DATA_TRUNC);
			if (err == -ENOENT)
				continue;
			return err;
		}

		if (dn.data_blkaddr != NULL_ADDR)
			truncate_data_blocks_range(&dn, 1);
		f2fs_put_dnode(&dn);
		mutex_unlock_op(sbi, DATA_TRUNC);
	}
	return 0;
}

static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
{
	pgoff_t pg_start, pg_end;
	loff_t off_start, off_end;
	int ret = 0;

	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;

	off_start = offset & (PAGE_CACHE_SIZE - 1);
	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);

	if (pg_start == pg_end) {
		fill_zero(inode, pg_start, off_start,
						off_end - off_start);
	} else {
		if (off_start)
			fill_zero(inode, pg_start++, off_start,
					PAGE_CACHE_SIZE - off_start);
		if (off_end)
			fill_zero(inode, pg_end, 0, off_end);

		if (pg_start < pg_end) {
			struct address_space *mapping = inode->i_mapping;
			loff_t blk_start, blk_end;

			blk_start = pg_start << PAGE_CACHE_SHIFT;
			blk_end = pg_end << PAGE_CACHE_SHIFT;
			truncate_inode_pages_range(mapping, blk_start,
					blk_end - 1);
			ret = truncate_hole(inode, pg_start, pg_end);
		}
	}

	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
		i_size_read(inode) <= (offset + len)) {
		i_size_write(inode, offset);
		mark_inode_dirty(inode);
	}

	return ret;
}

static int expand_inode_data(struct inode *inode, loff_t offset,
					loff_t len, int mode)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	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;

	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;

	off_start = offset & (PAGE_CACHE_SIZE - 1);
	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);

	for (index = pg_start; index <= pg_end; index++) {
		struct dnode_of_data dn;

		mutex_lock_op(sbi, DATA_NEW);

		set_new_dnode(&dn, inode, NULL, NULL, 0);
		ret = get_dnode_of_data(&dn, index, 0);
		if (ret) {
			mutex_unlock_op(sbi, DATA_NEW);
			break;
		}

		if (dn.data_blkaddr == NULL_ADDR) {
			ret = reserve_new_block(&dn);
			if (ret) {
				f2fs_put_dnode(&dn);
				mutex_unlock_op(sbi, DATA_NEW);
				break;
			}
		}
		f2fs_put_dnode(&dn);

		mutex_unlock_op(sbi, DATA_NEW);

		if (pg_start == pg_end)
			new_size = offset + len;
		else if (index == pg_start && off_start)
			new_size = (index + 1) << PAGE_CACHE_SHIFT;
		else if (index == pg_end)
			new_size = (index << PAGE_CACHE_SHIFT) + off_end;
		else
			new_size += PAGE_CACHE_SIZE;
	}

	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
		i_size_read(inode) < new_size) {
		i_size_write(inode, new_size);
		mark_inode_dirty(inode);
	}

	return ret;
}

static long f2fs_fallocate(struct file *file, int mode,
				loff_t offset, loff_t len)
{
	struct inode *inode = file_inode(file);
	long ret;

	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
		return -EOPNOTSUPP;

	if (mode & FALLOC_FL_PUNCH_HOLE)
		ret = punch_hole(inode, offset, len, mode);
	else
		ret = expand_inode_data(inode, offset, len, mode);

	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
	return ret;
}

#define F2FS_REG_FLMASK		(~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
#define F2FS_OTHER_FLMASK	(FS_NODUMP_FL | FS_NOATIME_FL)

static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
{
	if (S_ISDIR(mode))
		return flags;
	else if (S_ISREG(mode))
		return flags & F2FS_REG_FLMASK;
	else
		return flags & F2FS_OTHER_FLMASK;
}

long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int flags;
	int ret;

	switch (cmd) {
	case FS_IOC_GETFLAGS:
		flags = fi->i_flags & FS_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case FS_IOC_SETFLAGS:
	{
		unsigned int oldflags;

		ret = mnt_want_write(filp->f_path.mnt);
		if (ret)
			return ret;

		if (!inode_owner_or_capable(inode)) {
			ret = -EACCES;
			goto out;
		}

		if (get_user(flags, (int __user *) arg)) {
			ret = -EFAULT;
			goto out;
		}

		flags = f2fs_mask_flags(inode->i_mode, flags);

		mutex_lock(&inode->i_mutex);

		oldflags = fi->i_flags;

		if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				mutex_unlock(&inode->i_mutex);
				ret = -EPERM;
				goto out;
			}
		}

		flags = flags & FS_FL_USER_MODIFIABLE;
		flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
		fi->i_flags = flags;
		mutex_unlock(&inode->i_mutex);

		f2fs_set_inode_flags(inode);
		inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
out:
		mnt_drop_write(filp->f_path.mnt);
		return ret;
	}
	default:
		return -ENOTTY;
	}
}

#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;
	default:
		return -ENOIOCTLCMD;
	}
	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif

const struct file_operations f2fs_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= generic_file_aio_read,
	.aio_write	= generic_file_aio_write,
	.open		= generic_file_open,
	.mmap		= f2fs_file_mmap,
	.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	= generic_file_splice_write,
};
Commit	Line	Data
0a8165d7	1	/*
fbfa2cc5 JK	2	* fs/f2fs/file.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13	#include <linux/stat.h>
	14	#include <linux/buffer_head.h>
	15	#include <linux/writeback.h>
	16	#include <linux/falloc.h>
	17	#include <linux/types.h>
e9750824	18	#include <linux/compat.h>
fbfa2cc5 JK	19	#include <linux/uaccess.h>
	20	#include <linux/mount.h>
	21
	22	#include "f2fs.h"
	23	#include "node.h"
	24	#include "segment.h"
	25	#include "xattr.h"
	26	#include "acl.h"
	27
	28	static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
	29	struct vm_fault *vmf)
	30	{
	31	struct page *page = vmf->page;
6131ffaa	32	struct inode *inode = file_inode(vma->vm_file);
fbfa2cc5	33	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	34	block_t old_blk_addr;
	35	struct dnode_of_data dn;
	36	int err;
	37
	38	f2fs_balance_fs(sbi);
	39
	40	sb_start_pagefault(inode->i_sb);
	41
	42	mutex_lock_op(sbi, DATA_NEW);
	43
	44	/* block allocation */
	45	set_new_dnode(&dn, inode, NULL, NULL, 0);
	46	err = get_dnode_of_data(&dn, page->index, 0);
	47	if (err) {
	48	mutex_unlock_op(sbi, DATA_NEW);
	49	goto out;
	50	}
	51
	52	old_blk_addr = dn.data_blkaddr;
fbfa2cc5 JK	53
	54	if (old_blk_addr == NULL_ADDR) {
	55	err = reserve_new_block(&dn);
	56	if (err) {
	57	f2fs_put_dnode(&dn);
	58	mutex_unlock_op(sbi, DATA_NEW);
	59	goto out;
	60	}
	61	}
	62	f2fs_put_dnode(&dn);
	63
	64	mutex_unlock_op(sbi, DATA_NEW);
	65
	66	lock_page(page);
	67	if (page->mapping != inode->i_mapping \|\|
	68	page_offset(page) >= i_size_read(inode) \|\|
	69	!PageUptodate(page)) {
	70	unlock_page(page);
	71	err = -EFAULT;
	72	goto out;
	73	}
	74
	75	/*
	76	* check to see if the page is mapped already (no holes)
	77	*/
	78	if (PageMappedToDisk(page))
	79	goto out;
	80
	81	/* fill the page */
	82	wait_on_page_writeback(page);
	83
	84	/* page is wholly or partially inside EOF */
	85	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
	86	unsigned offset;
	87	offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
	88	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	89	}
	90	set_page_dirty(page);
	91	SetPageUptodate(page);
	92
	93	file_update_time(vma->vm_file);
	94	out:
	95	sb_end_pagefault(inode->i_sb);
	96	return block_page_mkwrite_return(err);
	97	}
	98
	99	static const struct vm_operations_struct f2fs_file_vm_ops = {
692bb55d JK	100	.fault = filemap_fault,
	101	.page_mkwrite = f2fs_vm_page_mkwrite,
	102	.remap_pages = generic_file_remap_pages,
fbfa2cc5 JK	103	};
	104
	105	static int need_to_sync_dir(struct f2fs_sb_info sbi, struct inode inode)
	106	{
	107	struct dentry *dentry;
	108	nid_t pino;
	109
	110	inode = igrab(inode);
	111	dentry = d_find_any_alias(inode);
	112	if (!dentry) {
	113	iput(inode);
	114	return 0;
	115	}
	116	pino = dentry->d_parent->d_inode->i_ino;
	117	dput(dentry);
	118	iput(inode);
	119	return !is_checkpointed_node(sbi, pino);
	120	}
	121
	122	int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
	123	{
	124	struct inode *inode = file->f_mapping->host;
	125	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	126	unsigned long long cur_version;
	127	int ret = 0;
	128	bool need_cp = false;
	129	struct writeback_control wbc = {
	130	.sync_mode = WB_SYNC_ALL,
	131	.nr_to_write = LONG_MAX,
	132	.for_reclaim = 0,
	133	};
	134
1fa95b0b NJ	135	if (inode->i_sb->s_flags & MS_RDONLY)
	136	return 0;
	137
fbfa2cc5 JK	138	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	139	if (ret)
	140	return ret;
	141
7d82db83 JK	142	/* guarantee free sections for fsync */
	143	f2fs_balance_fs(sbi);
	144
fbfa2cc5 JK	145	mutex_lock(&inode->i_mutex);
fbfa2cc5 JK	146
fbfa2cc5 JK	147	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
	148	goto out;
	149
	150	mutex_lock(&sbi->cp_mutex);
	151	cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver);
	152	mutex_unlock(&sbi->cp_mutex);
	153
	154	if (F2FS_I(inode)->data_version != cur_version &&
	155	!(inode->i_state & I_DIRTY))
	156	goto out;
	157	F2FS_I(inode)->data_version--;
	158
	159	if (!S_ISREG(inode->i_mode) \|\| inode->i_nlink != 1)
	160	need_cp = true;
facb0205	161	else if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP))
fbfa2cc5	162	need_cp = true;
facb0205	163	else if (!space_for_roll_forward(sbi))
fbfa2cc5	164	need_cp = true;
facb0205	165	else if (need_to_sync_dir(sbi, inode))
fbfa2cc5 JK	166	need_cp = true;
fbfa2cc5 JK	167
fbfa2cc5 JK	168	if (need_cp) {
	169	/* all the dirty node pages should be flushed for POR */
	170	ret = f2fs_sync_fs(inode->i_sb, 1);
	171	clear_inode_flag(F2FS_I(inode), FI_NEED_CP);
	172	} else {
398b1ac5 JK	173	/* if there is no written node page, write its inode page */
	174	while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
	175	ret = f2fs_write_inode(inode, NULL);
	176	if (ret)
	177	goto out;
	178	}
fbfa2cc5 JK	179	filemap_fdatawait_range(sbi->node_inode->i_mapping,
	180	0, LONG_MAX);
	181	}
	182	out:
	183	mutex_unlock(&inode->i_mutex);
	184	return ret;
	185	}
	186
	187	static int f2fs_file_mmap(struct file file, struct vm_area_struct vma)
	188	{
	189	file_accessed(file);
	190	vma->vm_ops = &f2fs_file_vm_ops;
	191	return 0;
	192	}
	193
	194	static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
	195	{
	196	int nr_free = 0, ofs = dn->ofs_in_node;
	197	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	198	struct f2fs_node *raw_node;
	199	__le32 *addr;
	200
	201	raw_node = page_address(dn->node_page);
	202	addr = blkaddr_in_node(raw_node) + ofs;
	203
	204	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
	205	block_t blkaddr = le32_to_cpu(*addr);
	206	if (blkaddr == NULL_ADDR)
	207	continue;
	208
	209	update_extent_cache(NULL_ADDR, dn);
	210	invalidate_blocks(sbi, blkaddr);
	211	dec_valid_block_count(sbi, dn->inode, 1);
	212	nr_free++;
	213	}
	214	if (nr_free) {
	215	set_page_dirty(dn->node_page);
	216	sync_inode_page(dn);
	217	}
	218	dn->ofs_in_node = ofs;
	219	return nr_free;
	220	}
	221
	222	void truncate_data_blocks(struct dnode_of_data *dn)
	223	{
	224	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
	225	}
	226
	227	static void truncate_partial_data_page(struct inode *inode, u64 from)
	228	{
	229	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	230	struct page *page;
	231
	232	if (!offset)
	233	return;
	234
	235	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT);
	236	if (IS_ERR(page))
	237	return;
	238
	239	lock_page(page);
	240	wait_on_page_writeback(page);
	241	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	242	set_page_dirty(page);
243	f2fs_put_page(page, 1);
244	}
245
246	static int truncate_blocks(struct inode *inode, u64 from)
247	{
248	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
249	unsigned int blocksize = inode->i_sb->s_blocksize;
250	struct dnode_of_data dn;
251	pgoff_t free_from;
252	int count = 0;
253	int err;
254
255	free_from = (pgoff_t)
256	((from + blocksize - 1) >> (sbi->log_blocksize));
257
258	mutex_lock_op(sbi, DATA_TRUNC);
259
260	set_new_dnode(&dn, inode, NULL, NULL, 0);
261	err = get_dnode_of_data(&dn, free_from, RDONLY_NODE);
262	if (err) {
263	if (err == -ENOENT)
264	goto free_next;
265	mutex_unlock_op(sbi, DATA_TRUNC);
266	return err;
267	}
268
269	if (IS_INODE(dn.node_page))
270	count = ADDRS_PER_INODE;
271	else
272	count = ADDRS_PER_BLOCK;
273
274	count -= dn.ofs_in_node;
275	BUG_ON(count < 0);
276	if (dn.ofs_in_node \|\| IS_INODE(dn.node_page)) {
277	truncate_data_blocks_range(&dn, count);
278	free_from += count;
279	}
280
281	f2fs_put_dnode(&dn);
282	free_next:
283	err = truncate_inode_blocks(inode, free_from);
284	mutex_unlock_op(sbi, DATA_TRUNC);
285
286	/* lastly zero out the first data page */
287	truncate_partial_data_page(inode, from);
288
289	return err;
290	}
291
292	void f2fs_truncate(struct inode *inode)
293	{
294	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
295	S_ISLNK(inode->i_mode)))
296	return;
297
298	if (!truncate_blocks(inode, i_size_read(inode))) {
299	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
300	mark_inode_dirty(inode);
301	}
fbfa2cc5 JK	302	}
	303
	304	static int f2fs_getattr(struct vfsmount *mnt,
	305	struct dentry dentry, struct kstat stat)
	306	{
	307	struct inode *inode = dentry->d_inode;
	308	generic_fillattr(inode, stat);
	309	stat->blocks <<= 3;
	310	return 0;
	311	}
	312
	313	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	314	static void __setattr_copy(struct inode inode, const struct iattr attr)
	315	{
	316	struct f2fs_inode_info *fi = F2FS_I(inode);
	317	unsigned int ia_valid = attr->ia_valid;
	318
	319	if (ia_valid & ATTR_UID)
	320	inode->i_uid = attr->ia_uid;
	321	if (ia_valid & ATTR_GID)
	322	inode->i_gid = attr->ia_gid;
	323	if (ia_valid & ATTR_ATIME)
	324	inode->i_atime = timespec_trunc(attr->ia_atime,
	325	inode->i_sb->s_time_gran);
	326	if (ia_valid & ATTR_MTIME)
	327	inode->i_mtime = timespec_trunc(attr->ia_mtime,
	328	inode->i_sb->s_time_gran);
	329	if (ia_valid & ATTR_CTIME)
	330	inode->i_ctime = timespec_trunc(attr->ia_ctime,
	331	inode->i_sb->s_time_gran);
	332	if (ia_valid & ATTR_MODE) {
	333	umode_t mode = attr->ia_mode;
	334
	335	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	336	mode &= ~S_ISGID;
	337	set_acl_inode(fi, mode);
	338	}
	339	}
	340	#else
	341	#define __setattr_copy setattr_copy
	342	#endif
	343
	344	int f2fs_setattr(struct dentry dentry, struct iattr attr)
	345	{
	346	struct inode *inode = dentry->d_inode;
	347	struct f2fs_inode_info *fi = F2FS_I(inode);
	348	int err;
	349
	350	err = inode_change_ok(inode, attr);
	351	if (err)
	352	return err;
	353
	354	if ((attr->ia_valid & ATTR_SIZE) &&
	355	attr->ia_size != i_size_read(inode)) {
	356	truncate_setsize(inode, attr->ia_size);
	357	f2fs_truncate(inode);
d4686d56	358	f2fs_balance_fs(F2FS_SB(inode->i_sb));
fbfa2cc5 JK	359	}
	360
	361	__setattr_copy(inode, attr);
	362
	363	if (attr->ia_valid & ATTR_MODE) {
	364	err = f2fs_acl_chmod(inode);
	365	if (err \|\| is_inode_flag_set(fi, FI_ACL_MODE)) {
	366	inode->i_mode = fi->i_acl_mode;
	367	clear_inode_flag(fi, FI_ACL_MODE);
	368	}
	369	}
	370
	371	mark_inode_dirty(inode);
	372	return err;
	373	}
	374
	375	const struct inode_operations f2fs_file_inode_operations = {
	376	.getattr = f2fs_getattr,
	377	.setattr = f2fs_setattr,
	378	.get_acl = f2fs_get_acl,
	379	#ifdef CONFIG_F2FS_FS_XATTR
	380	.setxattr = generic_setxattr,
	381	.getxattr = generic_getxattr,
	382	.listxattr = f2fs_listxattr,
	383	.removexattr = generic_removexattr,
	384	#endif
	385	};
	386
	387	static void fill_zero(struct inode *inode, pgoff_t index,
	388	loff_t start, loff_t len)
	389	{
bd43df02	390	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	391	struct page *page;
	392
	393	if (!len)
	394	return;
	395
bd43df02 JK	396	f2fs_balance_fs(sbi);
	397
	398	mutex_lock_op(sbi, DATA_NEW);
fbfa2cc5	399	page = get_new_data_page(inode, index, false);
bd43df02	400	mutex_unlock_op(sbi, DATA_NEW);
fbfa2cc5 JK	401
	402	if (!IS_ERR(page)) {
	403	wait_on_page_writeback(page);
	404	zero_user(page, start, len);
	405	set_page_dirty(page);
	406	f2fs_put_page(page, 1);
	407	}
	408	}
	409
	410	int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
	411	{
	412	pgoff_t index;
	413	int err;
	414
	415	for (index = pg_start; index < pg_end; index++) {
	416	struct dnode_of_data dn;
	417	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	418
9eaeba70 JK	419	f2fs_balance_fs(sbi);
9eaeba70 JK	420
fbfa2cc5 JK	421	mutex_lock_op(sbi, DATA_TRUNC);
	422	set_new_dnode(&dn, inode, NULL, NULL, 0);
	423	err = get_dnode_of_data(&dn, index, RDONLY_NODE);
	424	if (err) {
	425	mutex_unlock_op(sbi, DATA_TRUNC);
	426	if (err == -ENOENT)
	427	continue;
	428	return err;
	429	}
	430
	431	if (dn.data_blkaddr != NULL_ADDR)
	432	truncate_data_blocks_range(&dn, 1);
	433	f2fs_put_dnode(&dn);
	434	mutex_unlock_op(sbi, DATA_TRUNC);
	435	}
	436	return 0;
	437	}
	438
	439	static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
	440	{
	441	pgoff_t pg_start, pg_end;
	442	loff_t off_start, off_end;
	443	int ret = 0;
	444
	445	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	446	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	447
	448	off_start = offset & (PAGE_CACHE_SIZE - 1);
	449	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	450
	451	if (pg_start == pg_end) {
	452	fill_zero(inode, pg_start, off_start,
	453	off_end - off_start);
	454	} else {
	455	if (off_start)
	456	fill_zero(inode, pg_start++, off_start,
	457	PAGE_CACHE_SIZE - off_start);
	458	if (off_end)
	459	fill_zero(inode, pg_end, 0, off_end);
	460
	461	if (pg_start < pg_end) {
	462	struct address_space *mapping = inode->i_mapping;
	463	loff_t blk_start, blk_end;
	464
	465	blk_start = pg_start << PAGE_CACHE_SHIFT;
	466	blk_end = pg_end << PAGE_CACHE_SHIFT;
	467	truncate_inode_pages_range(mapping, blk_start,
	468	blk_end - 1);
	469	ret = truncate_hole(inode, pg_start, pg_end);
	470	}
	471	}
	472
	473	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	474	i_size_read(inode) <= (offset + len)) {
	475	i_size_write(inode, offset);
	476	mark_inode_dirty(inode);
	477	}
	478
	479	return ret;
	480	}
	481
	482	static int expand_inode_data(struct inode *inode, loff_t offset,
	483	loff_t len, int mode)
	484	{
485	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
486	pgoff_t index, pg_start, pg_end;
487	loff_t new_size = i_size_read(inode);
488	loff_t off_start, off_end;
489	int ret = 0;
490
491	ret = inode_newsize_ok(inode, (len + offset));
492	if (ret)
493	return ret;
494
495	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
496	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
497
498	off_start = offset & (PAGE_CACHE_SIZE - 1);
499	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
500
501	for (index = pg_start; index <= pg_end; index++) {
502	struct dnode_of_data dn;
503
504	mutex_lock_op(sbi, DATA_NEW);
505
506	set_new_dnode(&dn, inode, NULL, NULL, 0);
507	ret = get_dnode_of_data(&dn, index, 0);
508	if (ret) {
509	mutex_unlock_op(sbi, DATA_NEW);
510	break;
511	}
512
513	if (dn.data_blkaddr == NULL_ADDR) {
514	ret = reserve_new_block(&dn);
515	if (ret) {
516	f2fs_put_dnode(&dn);
517	mutex_unlock_op(sbi, DATA_NEW);
518	break;
519	}
520	}
521	f2fs_put_dnode(&dn);
522
523	mutex_unlock_op(sbi, DATA_NEW);
524
525	if (pg_start == pg_end)
526	new_size = offset + len;
527	else if (index == pg_start && off_start)
528	new_size = (index + 1) << PAGE_CACHE_SHIFT;
529	else if (index == pg_end)
530	new_size = (index << PAGE_CACHE_SHIFT) + off_end;
531	else
532	new_size += PAGE_CACHE_SIZE;
533	}
534
535	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
536	i_size_read(inode) < new_size) {
537	i_size_write(inode, new_size);
538	mark_inode_dirty(inode);
539	}
540
541	return ret;
542	}
543
544	static long f2fs_fallocate(struct file *file, int mode,
545	loff_t offset, loff_t len)
546	{
6131ffaa	547	struct inode *inode = file_inode(file);
fbfa2cc5 JK	548	long ret;
	549
	550	if (mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE))
	551	return -EOPNOTSUPP;
	552
	553	if (mode & FALLOC_FL_PUNCH_HOLE)
	554	ret = punch_hole(inode, offset, len, mode);
	555	else
	556	ret = expand_inode_data(inode, offset, len, mode);
	557
3af60a49 NJ	558	if (!ret) {
	559	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	560	mark_inode_dirty(inode);
	561	}
fbfa2cc5 JK	562	return ret;
	563	}
	564
	565	#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL \| FS_TOPDIR_FL))
	566	#define F2FS_OTHER_FLMASK (FS_NODUMP_FL \| FS_NOATIME_FL)
	567
	568	static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
	569	{
	570	if (S_ISDIR(mode))
	571	return flags;
	572	else if (S_ISREG(mode))
	573	return flags & F2FS_REG_FLMASK;
	574	else
	575	return flags & F2FS_OTHER_FLMASK;
	576	}
	577
	578	long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	579	{
6131ffaa	580	struct inode *inode = file_inode(filp);
fbfa2cc5 JK	581	struct f2fs_inode_info *fi = F2FS_I(inode);
	582	unsigned int flags;
	583	int ret;
	584
	585	switch (cmd) {
	586	case FS_IOC_GETFLAGS:
	587	flags = fi->i_flags & FS_FL_USER_VISIBLE;
	588	return put_user(flags, (int __user *) arg);
	589	case FS_IOC_SETFLAGS:
	590	{
	591	unsigned int oldflags;
	592
	593	ret = mnt_want_write(filp->f_path.mnt);
	594	if (ret)
	595	return ret;
	596
	597	if (!inode_owner_or_capable(inode)) {
	598	ret = -EACCES;
	599	goto out;
	600	}
	601
	602	if (get_user(flags, (int __user *) arg)) {
	603	ret = -EFAULT;
	604	goto out;
	605	}
	606
	607	flags = f2fs_mask_flags(inode->i_mode, flags);
	608
	609	mutex_lock(&inode->i_mutex);
	610
	611	oldflags = fi->i_flags;
	612
	613	if ((flags ^ oldflags) & (FS_APPEND_FL \| FS_IMMUTABLE_FL)) {
	614	if (!capable(CAP_LINUX_IMMUTABLE)) {
	615	mutex_unlock(&inode->i_mutex);
	616	ret = -EPERM;
	617	goto out;
	618	}
	619	}
	620
	621	flags = flags & FS_FL_USER_MODIFIABLE;
	622	flags \|= oldflags & ~FS_FL_USER_MODIFIABLE;
	623	fi->i_flags = flags;
	624	mutex_unlock(&inode->i_mutex);
	625
	626	f2fs_set_inode_flags(inode);
	627	inode->i_ctime = CURRENT_TIME;
	628	mark_inode_dirty(inode);
	629	out:
	630	mnt_drop_write(filp->f_path.mnt);
	631	return ret;
	632	}
	633	default:
	634	return -ENOTTY;
	635	}
	636	}
	637
e9750824 NJ	638	#ifdef CONFIG_COMPAT
	639	long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	640	{
	641	switch (cmd) {
	642	case F2FS_IOC32_GETFLAGS:
	643	cmd = F2FS_IOC_GETFLAGS;
	644	break;
	645	case F2FS_IOC32_SETFLAGS:
	646	cmd = F2FS_IOC_SETFLAGS;
	647	break;
	648	default:
	649	return -ENOIOCTLCMD;
	650	}
	651	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	652	}
	653	#endif
	654
fbfa2cc5 JK	655	const struct file_operations f2fs_file_operations = {
	656	.llseek = generic_file_llseek,
	657	.read = do_sync_read,
	658	.write = do_sync_write,
	659	.aio_read = generic_file_aio_read,
	660	.aio_write = generic_file_aio_write,
	661	.open = generic_file_open,
	662	.mmap = f2fs_file_mmap,
	663	.fsync = f2fs_sync_file,
	664	.fallocate = f2fs_fallocate,
	665	.unlocked_ioctl = f2fs_ioctl,
e9750824 NJ	666	#ifdef CONFIG_COMPAT
	667	.compat_ioctl = f2fs_compat_ioctl,
	668	#endif
fbfa2cc5 JK	669	.splice_read = generic_file_splice_read,
	670	.splice_write = generic_file_splice_write,
	671	};