[deliverable/linux.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/blkdev.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, ilock;

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);

	/* block allocation */
	ilock = mutex_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
	if (err) {
		mutex_unlock_op(sbi, ilock);
		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, ilock);
			goto out;
		}
	}
	f2fs_put_dnode(&dn);
	mutex_unlock_op(sbi, ilock);

	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,
};

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);
	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;

	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
		need_cp = true;
	else if (is_cp_file(inode))
		need_cp = true;
	else if (!space_for_roll_forward(sbi))
		need_cp = true;
	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
		need_cp = true;

	if (need_cp) {
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
	} 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);
		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
	}
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, ilock = -1;
	int err;

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

	ilock = mutex_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
	if (err) {
		if (err == -ENOENT)
			goto free_next;
		mutex_unlock_op(sbi, ilock);
		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, ilock);

	/* 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;
	int ilock;

	if (!len)
		return;

	f2fs_balance_fs(sbi);

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

	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;

		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
		if (err) {
			if (err == -ENOENT)
				continue;
			return err;
		}

		if (dn.data_blkaddr != NULL_ADDR)
			truncate_data_blocks_range(&dn, 1);
		f2fs_put_dnode(&dn);
	}
	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;
			struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
			int ilock;

			f2fs_balance_fs(sbi);

			blk_start = pg_start << PAGE_CACHE_SHIFT;
			blk_end = pg_end << PAGE_CACHE_SHIFT;
			truncate_inode_pages_range(mapping, blk_start,
					blk_end - 1);

			ilock = mutex_lock_op(sbi);
			ret = truncate_hole(inode, pg_start, pg_end);
			mutex_unlock_op(sbi, ilock);
		}
	}

	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;
		int ilock;

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

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

		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>
ae51fb31	16	#include <linux/blkdev.h>
fbfa2cc5 JK	17	#include <linux/falloc.h>
fbfa2cc5 JK	18	#include <linux/types.h>
e9750824	19	#include <linux/compat.h>
fbfa2cc5 JK	20	#include <linux/uaccess.h>
	21	#include <linux/mount.h>
	22
	23	#include "f2fs.h"
	24	#include "node.h"
	25	#include "segment.h"
	26	#include "xattr.h"
	27	#include "acl.h"
	28
	29	static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
	30	struct vm_fault *vmf)
	31	{
	32	struct page *page = vmf->page;
6131ffaa	33	struct inode *inode = file_inode(vma->vm_file);
fbfa2cc5	34	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	35	block_t old_blk_addr;
fbfa2cc5 JK	36	struct dnode_of_data dn;
39936837	37	int err, ilock;
fbfa2cc5 JK	38
	39	f2fs_balance_fs(sbi);
	40
	41	sb_start_pagefault(inode->i_sb);
	42
fbfa2cc5	43	/* block allocation */
39936837	44	ilock = mutex_lock_op(sbi);
fbfa2cc5	45	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	46	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
fbfa2cc5	47	if (err) {
39936837	48	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	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);
39936837	58	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	59	goto out;
	60	}
	61	}
	62	f2fs_put_dnode(&dn);
39936837	63	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	64
	65	lock_page(page);
	66	if (page->mapping != inode->i_mapping \|\|
	67	page_offset(page) >= i_size_read(inode) \|\|
	68	!PageUptodate(page)) {
	69	unlock_page(page);
	70	err = -EFAULT;
	71	goto out;
	72	}
	73
	74	/*
	75	* check to see if the page is mapped already (no holes)
	76	*/
	77	if (PageMappedToDisk(page))
	78	goto out;
	79
	80	/* fill the page */
	81	wait_on_page_writeback(page);
	82
	83	/* page is wholly or partially inside EOF */
	84	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
	85	unsigned offset;
	86	offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
	87	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	88	}
	89	set_page_dirty(page);
	90	SetPageUptodate(page);
	91
	92	file_update_time(vma->vm_file);
	93	out:
	94	sb_end_pagefault(inode->i_sb);
	95	return block_page_mkwrite_return(err);
	96	}
	97
	98	static const struct vm_operations_struct f2fs_file_vm_ops = {
692bb55d JK	99	.fault = filemap_fault,
	100	.page_mkwrite = f2fs_vm_page_mkwrite,
	101	.remap_pages = generic_file_remap_pages,
fbfa2cc5 JK	102	};
fbfa2cc5 JK	103
fbfa2cc5 JK	104	int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
	105	{
	106	struct inode *inode = file->f_mapping->host;
	107	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	108	int ret = 0;
	109	bool need_cp = false;
	110	struct writeback_control wbc = {
	111	.sync_mode = WB_SYNC_ALL,
	112	.nr_to_write = LONG_MAX,
	113	.for_reclaim = 0,
	114	};
	115
1fa95b0b NJ	116	if (inode->i_sb->s_flags & MS_RDONLY)
	117	return 0;
	118
fbfa2cc5 JK	119	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	120	if (ret)
	121	return ret;
	122
7d82db83 JK	123	/* guarantee free sections for fsync */
	124	f2fs_balance_fs(sbi);
	125
fbfa2cc5 JK	126	mutex_lock(&inode->i_mutex);
fbfa2cc5 JK	127
fbfa2cc5 JK	128	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
	129	goto out;
	130
fbfa2cc5 JK	131	if (!S_ISREG(inode->i_mode) \|\| inode->i_nlink != 1)
fbfa2cc5 JK	132	need_cp = true;
953a3e27	133	else if (is_cp_file(inode))
fbfa2cc5	134	need_cp = true;
facb0205	135	else if (!space_for_roll_forward(sbi))
fbfa2cc5	136	need_cp = true;
953a3e27	137	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
fbfa2cc5 JK	138	need_cp = true;
fbfa2cc5 JK	139
fbfa2cc5 JK	140	if (need_cp) {
	141	/* all the dirty node pages should be flushed for POR */
	142	ret = f2fs_sync_fs(inode->i_sb, 1);
fbfa2cc5	143	} else {
398b1ac5 JK	144	/* if there is no written node page, write its inode page */
	145	while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
	146	ret = f2fs_write_inode(inode, NULL);
	147	if (ret)
	148	goto out;
	149	}
fbfa2cc5 JK	150	filemap_fdatawait_range(sbi->node_inode->i_mapping,
fbfa2cc5 JK	151	0, LONG_MAX);
ae51fb31	152	ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
fbfa2cc5 JK	153	}
	154	out:
	155	mutex_unlock(&inode->i_mutex);
	156	return ret;
	157	}
	158
	159	static int f2fs_file_mmap(struct file file, struct vm_area_struct vma)
	160	{
	161	file_accessed(file);
	162	vma->vm_ops = &f2fs_file_vm_ops;
	163	return 0;
	164	}
	165
	166	static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
	167	{
	168	int nr_free = 0, ofs = dn->ofs_in_node;
	169	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	170	struct f2fs_node *raw_node;
	171	__le32 *addr;
	172
	173	raw_node = page_address(dn->node_page);
	174	addr = blkaddr_in_node(raw_node) + ofs;
	175
	176	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
	177	block_t blkaddr = le32_to_cpu(*addr);
	178	if (blkaddr == NULL_ADDR)
	179	continue;
	180
	181	update_extent_cache(NULL_ADDR, dn);
	182	invalidate_blocks(sbi, blkaddr);
	183	dec_valid_block_count(sbi, dn->inode, 1);
	184	nr_free++;
	185	}
	186	if (nr_free) {
	187	set_page_dirty(dn->node_page);
	188	sync_inode_page(dn);
	189	}
	190	dn->ofs_in_node = ofs;
	191	return nr_free;
	192	}
	193
	194	void truncate_data_blocks(struct dnode_of_data *dn)
	195	{
	196	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
	197	}
	198
	199	static void truncate_partial_data_page(struct inode *inode, u64 from)
	200	{
	201	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	202	struct page *page;
	203
	204	if (!offset)
	205	return;
	206
	207	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT);
	208	if (IS_ERR(page))
	209	return;
	210
	211	lock_page(page);
	212	wait_on_page_writeback(page);
	213	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	214	set_page_dirty(page);
	215	f2fs_put_page(page, 1);
	216	}
217
218	static int truncate_blocks(struct inode *inode, u64 from)
219	{
220	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
221	unsigned int blocksize = inode->i_sb->s_blocksize;
222	struct dnode_of_data dn;
223	pgoff_t free_from;
39936837	224	int count = 0, ilock = -1;
fbfa2cc5 JK	225	int err;
	226
	227	free_from = (pgoff_t)
	228	((from + blocksize - 1) >> (sbi->log_blocksize));
	229
39936837	230	ilock = mutex_lock_op(sbi);
fbfa2cc5	231	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	232	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
fbfa2cc5 JK	233	if (err) {
	234	if (err == -ENOENT)
	235	goto free_next;
39936837	236	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	237	return err;
	238	}
	239
	240	if (IS_INODE(dn.node_page))
	241	count = ADDRS_PER_INODE;
	242	else
	243	count = ADDRS_PER_BLOCK;
	244
	245	count -= dn.ofs_in_node;
	246	BUG_ON(count < 0);
39936837	247
fbfa2cc5 JK	248	if (dn.ofs_in_node \|\| IS_INODE(dn.node_page)) {
	249	truncate_data_blocks_range(&dn, count);
	250	free_from += count;
	251	}
	252
	253	f2fs_put_dnode(&dn);
	254	free_next:
	255	err = truncate_inode_blocks(inode, free_from);
39936837	256	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	257
	258	/* lastly zero out the first data page */
	259	truncate_partial_data_page(inode, from);
	260
	261	return err;
	262	}
	263
	264	void f2fs_truncate(struct inode *inode)
	265	{
	266	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	267	S_ISLNK(inode->i_mode)))
	268	return;
	269
	270	if (!truncate_blocks(inode, i_size_read(inode))) {
	271	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	272	mark_inode_dirty(inode);
	273	}
fbfa2cc5 JK	274	}
	275
	276	static int f2fs_getattr(struct vfsmount *mnt,
	277	struct dentry dentry, struct kstat stat)
	278	{
	279	struct inode *inode = dentry->d_inode;
	280	generic_fillattr(inode, stat);
	281	stat->blocks <<= 3;
	282	return 0;
	283	}
	284
	285	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	286	static void __setattr_copy(struct inode inode, const struct iattr attr)
	287	{
	288	struct f2fs_inode_info *fi = F2FS_I(inode);
	289	unsigned int ia_valid = attr->ia_valid;
	290
	291	if (ia_valid & ATTR_UID)
	292	inode->i_uid = attr->ia_uid;
	293	if (ia_valid & ATTR_GID)
	294	inode->i_gid = attr->ia_gid;
	295	if (ia_valid & ATTR_ATIME)
	296	inode->i_atime = timespec_trunc(attr->ia_atime,
	297	inode->i_sb->s_time_gran);
	298	if (ia_valid & ATTR_MTIME)
	299	inode->i_mtime = timespec_trunc(attr->ia_mtime,
	300	inode->i_sb->s_time_gran);
	301	if (ia_valid & ATTR_CTIME)
	302	inode->i_ctime = timespec_trunc(attr->ia_ctime,
	303	inode->i_sb->s_time_gran);
	304	if (ia_valid & ATTR_MODE) {
	305	umode_t mode = attr->ia_mode;
	306
	307	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	308	mode &= ~S_ISGID;
	309	set_acl_inode(fi, mode);
	310	}
	311	}
	312	#else
	313	#define __setattr_copy setattr_copy
	314	#endif
	315
	316	int f2fs_setattr(struct dentry dentry, struct iattr attr)
	317	{
	318	struct inode *inode = dentry->d_inode;
	319	struct f2fs_inode_info *fi = F2FS_I(inode);
	320	int err;
	321
	322	err = inode_change_ok(inode, attr);
	323	if (err)
	324	return err;
	325
	326	if ((attr->ia_valid & ATTR_SIZE) &&
	327	attr->ia_size != i_size_read(inode)) {
	328	truncate_setsize(inode, attr->ia_size);
	329	f2fs_truncate(inode);
d4686d56	330	f2fs_balance_fs(F2FS_SB(inode->i_sb));
fbfa2cc5 JK	331	}
	332
	333	__setattr_copy(inode, attr);
	334
	335	if (attr->ia_valid & ATTR_MODE) {
	336	err = f2fs_acl_chmod(inode);
	337	if (err \|\| is_inode_flag_set(fi, FI_ACL_MODE)) {
	338	inode->i_mode = fi->i_acl_mode;
	339	clear_inode_flag(fi, FI_ACL_MODE);
	340	}
	341	}
	342
	343	mark_inode_dirty(inode);
	344	return err;
	345	}
	346
	347	const struct inode_operations f2fs_file_inode_operations = {
	348	.getattr = f2fs_getattr,
	349	.setattr = f2fs_setattr,
	350	.get_acl = f2fs_get_acl,
	351	#ifdef CONFIG_F2FS_FS_XATTR
	352	.setxattr = generic_setxattr,
	353	.getxattr = generic_getxattr,
	354	.listxattr = f2fs_listxattr,
	355	.removexattr = generic_removexattr,
	356	#endif
	357	};
	358
	359	static void fill_zero(struct inode *inode, pgoff_t index,
	360	loff_t start, loff_t len)
	361	{
bd43df02	362	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5	363	struct page *page;
39936837	364	int ilock;
fbfa2cc5 JK	365
	366	if (!len)
	367	return;
	368
bd43df02 JK	369	f2fs_balance_fs(sbi);
bd43df02 JK	370
39936837	371	ilock = mutex_lock_op(sbi);
fbfa2cc5	372	page = get_new_data_page(inode, index, false);
39936837	373	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	374
	375	if (!IS_ERR(page)) {
	376	wait_on_page_writeback(page);
	377	zero_user(page, start, len);
	378	set_page_dirty(page);
	379	f2fs_put_page(page, 1);
	380	}
	381	}
	382
	383	int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
	384	{
	385	pgoff_t index;
	386	int err;
	387
	388	for (index = pg_start; index < pg_end; index++) {
	389	struct dnode_of_data dn;
fbfa2cc5	390
fbfa2cc5	391	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	392	err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
fbfa2cc5	393	if (err) {
fbfa2cc5 JK	394	if (err == -ENOENT)
	395	continue;
	396	return err;
	397	}
	398
	399	if (dn.data_blkaddr != NULL_ADDR)
	400	truncate_data_blocks_range(&dn, 1);
	401	f2fs_put_dnode(&dn);
fbfa2cc5 JK	402	}
	403	return 0;
	404	}
	405
	406	static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
	407	{
	408	pgoff_t pg_start, pg_end;
	409	loff_t off_start, off_end;
	410	int ret = 0;
	411
	412	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	413	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	414
	415	off_start = offset & (PAGE_CACHE_SIZE - 1);
	416	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	417
	418	if (pg_start == pg_end) {
	419	fill_zero(inode, pg_start, off_start,
	420	off_end - off_start);
	421	} else {
	422	if (off_start)
	423	fill_zero(inode, pg_start++, off_start,
	424	PAGE_CACHE_SIZE - off_start);
	425	if (off_end)
	426	fill_zero(inode, pg_end, 0, off_end);
	427
	428	if (pg_start < pg_end) {
	429	struct address_space *mapping = inode->i_mapping;
	430	loff_t blk_start, blk_end;
1127a3d4	431	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
39936837	432	int ilock;
1127a3d4 JH	433
1127a3d4 JH	434	f2fs_balance_fs(sbi);
fbfa2cc5 JK	435
	436	blk_start = pg_start << PAGE_CACHE_SHIFT;
	437	blk_end = pg_end << PAGE_CACHE_SHIFT;
	438	truncate_inode_pages_range(mapping, blk_start,
	439	blk_end - 1);
39936837 JK	440
39936837 JK	441	ilock = mutex_lock_op(sbi);
fbfa2cc5	442	ret = truncate_hole(inode, pg_start, pg_end);
39936837	443	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	444	}
	445	}
	446
	447	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	448	i_size_read(inode) <= (offset + len)) {
	449	i_size_write(inode, offset);
	450	mark_inode_dirty(inode);
	451	}
	452
	453	return ret;
	454	}
	455
	456	static int expand_inode_data(struct inode *inode, loff_t offset,
	457	loff_t len, int mode)
	458	{
	459	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	460	pgoff_t index, pg_start, pg_end;
	461	loff_t new_size = i_size_read(inode);
	462	loff_t off_start, off_end;
	463	int ret = 0;
	464
	465	ret = inode_newsize_ok(inode, (len + offset));
	466	if (ret)
	467	return ret;
	468
	469	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	470	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	471
	472	off_start = offset & (PAGE_CACHE_SIZE - 1);
	473	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	474
	475	for (index = pg_start; index <= pg_end; index++) {
	476	struct dnode_of_data dn;
39936837	477	int ilock;
fbfa2cc5	478
39936837	479	ilock = mutex_lock_op(sbi);
fbfa2cc5	480	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	481	ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
fbfa2cc5	482	if (ret) {
39936837	483	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	484	break;
	485	}
	486
	487	if (dn.data_blkaddr == NULL_ADDR) {
	488	ret = reserve_new_block(&dn);
	489	if (ret) {
	490	f2fs_put_dnode(&dn);
39936837	491	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	492	break;
	493	}
	494	}
	495	f2fs_put_dnode(&dn);
39936837	496	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	497
	498	if (pg_start == pg_end)
	499	new_size = offset + len;
	500	else if (index == pg_start && off_start)
	501	new_size = (index + 1) << PAGE_CACHE_SHIFT;
	502	else if (index == pg_end)
	503	new_size = (index << PAGE_CACHE_SHIFT) + off_end;
	504	else
	505	new_size += PAGE_CACHE_SIZE;
	506	}
	507
	508	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	509	i_size_read(inode) < new_size) {
	510	i_size_write(inode, new_size);
	511	mark_inode_dirty(inode);
	512	}
	513
	514	return ret;
	515	}
	516
	517	static long f2fs_fallocate(struct file *file, int mode,
	518	loff_t offset, loff_t len)
	519	{
6131ffaa	520	struct inode *inode = file_inode(file);
fbfa2cc5 JK	521	long ret;
	522
	523	if (mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE))
	524	return -EOPNOTSUPP;
	525
	526	if (mode & FALLOC_FL_PUNCH_HOLE)
	527	ret = punch_hole(inode, offset, len, mode);
	528	else
	529	ret = expand_inode_data(inode, offset, len, mode);
	530
3af60a49 NJ	531	if (!ret) {
	532	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	533	mark_inode_dirty(inode);
	534	}
fbfa2cc5 JK	535	return ret;
	536	}
	537
	538	#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL \| FS_TOPDIR_FL))
	539	#define F2FS_OTHER_FLMASK (FS_NODUMP_FL \| FS_NOATIME_FL)
	540
	541	static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
	542	{
	543	if (S_ISDIR(mode))
	544	return flags;
	545	else if (S_ISREG(mode))
	546	return flags & F2FS_REG_FLMASK;
	547	else
	548	return flags & F2FS_OTHER_FLMASK;
	549	}
	550
	551	long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	552	{
6131ffaa	553	struct inode *inode = file_inode(filp);
fbfa2cc5 JK	554	struct f2fs_inode_info *fi = F2FS_I(inode);
	555	unsigned int flags;
	556	int ret;
	557
	558	switch (cmd) {
	559	case FS_IOC_GETFLAGS:
	560	flags = fi->i_flags & FS_FL_USER_VISIBLE;
	561	return put_user(flags, (int __user *) arg);
	562	case FS_IOC_SETFLAGS:
	563	{
	564	unsigned int oldflags;
	565
	566	ret = mnt_want_write(filp->f_path.mnt);
	567	if (ret)
	568	return ret;
	569
	570	if (!inode_owner_or_capable(inode)) {
	571	ret = -EACCES;
	572	goto out;
	573	}
	574
	575	if (get_user(flags, (int __user *) arg)) {
	576	ret = -EFAULT;
	577	goto out;
	578	}
	579
	580	flags = f2fs_mask_flags(inode->i_mode, flags);
	581
	582	mutex_lock(&inode->i_mutex);
	583
	584	oldflags = fi->i_flags;
	585
	586	if ((flags ^ oldflags) & (FS_APPEND_FL \| FS_IMMUTABLE_FL)) {
	587	if (!capable(CAP_LINUX_IMMUTABLE)) {
	588	mutex_unlock(&inode->i_mutex);
	589	ret = -EPERM;
	590	goto out;
	591	}
	592	}
	593
	594	flags = flags & FS_FL_USER_MODIFIABLE;
	595	flags \|= oldflags & ~FS_FL_USER_MODIFIABLE;
	596	fi->i_flags = flags;
	597	mutex_unlock(&inode->i_mutex);
	598
	599	f2fs_set_inode_flags(inode);
	600	inode->i_ctime = CURRENT_TIME;
	601	mark_inode_dirty(inode);
	602	out:
	603	mnt_drop_write(filp->f_path.mnt);
	604	return ret;
	605	}
	606	default:
	607	return -ENOTTY;
	608	}
	609	}
	610
e9750824 NJ	611	#ifdef CONFIG_COMPAT
	612	long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	613	{
	614	switch (cmd) {
	615	case F2FS_IOC32_GETFLAGS:
	616	cmd = F2FS_IOC_GETFLAGS;
	617	break;
	618	case F2FS_IOC32_SETFLAGS:
	619	cmd = F2FS_IOC_SETFLAGS;
	620	break;
	621	default:
	622	return -ENOIOCTLCMD;
	623	}
	624	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	625	}
	626	#endif
	627
fbfa2cc5 JK	628	const struct file_operations f2fs_file_operations = {
	629	.llseek = generic_file_llseek,
	630	.read = do_sync_read,
	631	.write = do_sync_write,
	632	.aio_read = generic_file_aio_read,
	633	.aio_write = generic_file_aio_write,
	634	.open = generic_file_open,
	635	.mmap = f2fs_file_mmap,
	636	.fsync = f2fs_sync_file,
	637	.fallocate = f2fs_fallocate,
	638	.unlocked_ioctl = f2fs_ioctl,
e9750824 NJ	639	#ifdef CONFIG_COMPAT
	640	.compat_ioctl = f2fs_compat_ioctl,
	641	#endif
fbfa2cc5 JK	642	.splice_read = generic_file_splice_read,
	643	.splice_write = generic_file_splice_write,
	644	};