[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;

	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, ALLOC_NODE);
	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,
};

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;
	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, LOOKUP_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, LOOKUP_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, ALLOC_NODE);
		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>
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;
	36	struct dnode_of_data dn;
	37	int err;
	38
	39	f2fs_balance_fs(sbi);
	40
	41	sb_start_pagefault(inode->i_sb);
	42
	43	mutex_lock_op(sbi, DATA_NEW);
	44
	45	/* block allocation */
	46	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	47	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
fbfa2cc5 JK	48	if (err) {
	49	mutex_unlock_op(sbi, DATA_NEW);
	50	goto out;
	51	}
	52
	53	old_blk_addr = dn.data_blkaddr;
fbfa2cc5 JK	54
	55	if (old_blk_addr == NULL_ADDR) {
	56	err = reserve_new_block(&dn);
	57	if (err) {
	58	f2fs_put_dnode(&dn);
	59	mutex_unlock_op(sbi, DATA_NEW);
	60	goto out;
	61	}
	62	}
	63	f2fs_put_dnode(&dn);
	64
	65	mutex_unlock_op(sbi, DATA_NEW);
	66
	67	lock_page(page);
	68	if (page->mapping != inode->i_mapping \|\|
	69	page_offset(page) >= i_size_read(inode) \|\|
	70	!PageUptodate(page)) {
	71	unlock_page(page);
	72	err = -EFAULT;
	73	goto out;
	74	}
	75
	76	/*
	77	* check to see if the page is mapped already (no holes)
	78	*/
	79	if (PageMappedToDisk(page))
	80	goto out;
	81
	82	/* fill the page */
	83	wait_on_page_writeback(page);
	84
	85	/* page is wholly or partially inside EOF */
	86	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
	87	unsigned offset;
	88	offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
	89	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	90	}
	91	set_page_dirty(page);
	92	SetPageUptodate(page);
	93
	94	file_update_time(vma->vm_file);
	95	out:
	96	sb_end_pagefault(inode->i_sb);
	97	return block_page_mkwrite_return(err);
	98	}
	99
	100	static const struct vm_operations_struct f2fs_file_vm_ops = {
692bb55d JK	101	.fault = filemap_fault,
	102	.page_mkwrite = f2fs_vm_page_mkwrite,
	103	.remap_pages = generic_file_remap_pages,
fbfa2cc5 JK	104	};
fbfa2cc5 JK	105
fbfa2cc5 JK	106	int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
	107	{
	108	struct inode *inode = file->f_mapping->host;
	109	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	110	int ret = 0;
	111	bool need_cp = false;
	112	struct writeback_control wbc = {
	113	.sync_mode = WB_SYNC_ALL,
	114	.nr_to_write = LONG_MAX,
	115	.for_reclaim = 0,
	116	};
	117
1fa95b0b NJ	118	if (inode->i_sb->s_flags & MS_RDONLY)
	119	return 0;
	120
fbfa2cc5 JK	121	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	122	if (ret)
	123	return ret;
	124
7d82db83 JK	125	/* guarantee free sections for fsync */
	126	f2fs_balance_fs(sbi);
	127
fbfa2cc5 JK	128	mutex_lock(&inode->i_mutex);
fbfa2cc5 JK	129
fbfa2cc5 JK	130	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
	131	goto out;
	132
fbfa2cc5 JK	133	if (!S_ISREG(inode->i_mode) \|\| inode->i_nlink != 1)
fbfa2cc5 JK	134	need_cp = true;
953a3e27	135	else if (is_cp_file(inode))
fbfa2cc5	136	need_cp = true;
facb0205	137	else if (!space_for_roll_forward(sbi))
fbfa2cc5	138	need_cp = true;
953a3e27	139	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
fbfa2cc5 JK	140	need_cp = true;
fbfa2cc5 JK	141
fbfa2cc5 JK	142	if (need_cp) {
	143	/* all the dirty node pages should be flushed for POR */
	144	ret = f2fs_sync_fs(inode->i_sb, 1);
fbfa2cc5	145	} else {
398b1ac5 JK	146	/* if there is no written node page, write its inode page */
	147	while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
	148	ret = f2fs_write_inode(inode, NULL);
	149	if (ret)
	150	goto out;
	151	}
fbfa2cc5 JK	152	filemap_fdatawait_range(sbi->node_inode->i_mapping,
fbfa2cc5 JK	153	0, LONG_MAX);
ae51fb31	154	ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
fbfa2cc5 JK	155	}
	156	out:
	157	mutex_unlock(&inode->i_mutex);
	158	return ret;
	159	}
	160
	161	static int f2fs_file_mmap(struct file file, struct vm_area_struct vma)
	162	{
	163	file_accessed(file);
	164	vma->vm_ops = &f2fs_file_vm_ops;
	165	return 0;
	166	}
	167
	168	static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
	169	{
	170	int nr_free = 0, ofs = dn->ofs_in_node;
	171	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	172	struct f2fs_node *raw_node;
	173	__le32 *addr;
	174
	175	raw_node = page_address(dn->node_page);
	176	addr = blkaddr_in_node(raw_node) + ofs;
	177
	178	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
	179	block_t blkaddr = le32_to_cpu(*addr);
	180	if (blkaddr == NULL_ADDR)
	181	continue;
	182
	183	update_extent_cache(NULL_ADDR, dn);
	184	invalidate_blocks(sbi, blkaddr);
	185	dec_valid_block_count(sbi, dn->inode, 1);
	186	nr_free++;
	187	}
	188	if (nr_free) {
	189	set_page_dirty(dn->node_page);
	190	sync_inode_page(dn);
	191	}
	192	dn->ofs_in_node = ofs;
	193	return nr_free;
	194	}
	195
	196	void truncate_data_blocks(struct dnode_of_data *dn)
	197	{
	198	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
	199	}
	200
	201	static void truncate_partial_data_page(struct inode *inode, u64 from)
	202	{
	203	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	204	struct page *page;
	205
	206	if (!offset)
	207	return;
	208
	209	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT);
	210	if (IS_ERR(page))
	211	return;
	212
	213	lock_page(page);
	214	wait_on_page_writeback(page);
	215	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	216	set_page_dirty(page);
	217	f2fs_put_page(page, 1);
	218	}
219
220	static int truncate_blocks(struct inode *inode, u64 from)
221	{
222	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
223	unsigned int blocksize = inode->i_sb->s_blocksize;
224	struct dnode_of_data dn;
225	pgoff_t free_from;
226	int count = 0;
227	int err;
228
229	free_from = (pgoff_t)
230	((from + blocksize - 1) >> (sbi->log_blocksize));
231
232	mutex_lock_op(sbi, DATA_TRUNC);
233
234	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	235	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
fbfa2cc5 JK	236	if (err) {
	237	if (err == -ENOENT)
	238	goto free_next;
	239	mutex_unlock_op(sbi, DATA_TRUNC);
	240	return err;
	241	}
	242
	243	if (IS_INODE(dn.node_page))
	244	count = ADDRS_PER_INODE;
	245	else
	246	count = ADDRS_PER_BLOCK;
	247
	248	count -= dn.ofs_in_node;
	249	BUG_ON(count < 0);
	250	if (dn.ofs_in_node \|\| IS_INODE(dn.node_page)) {
	251	truncate_data_blocks_range(&dn, count);
	252	free_from += count;
	253	}
	254
	255	f2fs_put_dnode(&dn);
	256	free_next:
	257	err = truncate_inode_blocks(inode, free_from);
	258	mutex_unlock_op(sbi, DATA_TRUNC);
	259
	260	/* lastly zero out the first data page */
	261	truncate_partial_data_page(inode, from);
	262
	263	return err;
	264	}
	265
	266	void f2fs_truncate(struct inode *inode)
	267	{
	268	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	269	S_ISLNK(inode->i_mode)))
	270	return;
	271
	272	if (!truncate_blocks(inode, i_size_read(inode))) {
	273	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	274	mark_inode_dirty(inode);
	275	}
fbfa2cc5 JK	276	}
	277
	278	static int f2fs_getattr(struct vfsmount *mnt,
	279	struct dentry dentry, struct kstat stat)
	280	{
	281	struct inode *inode = dentry->d_inode;
	282	generic_fillattr(inode, stat);
	283	stat->blocks <<= 3;
	284	return 0;
	285	}
	286
	287	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	288	static void __setattr_copy(struct inode inode, const struct iattr attr)
	289	{
	290	struct f2fs_inode_info *fi = F2FS_I(inode);
	291	unsigned int ia_valid = attr->ia_valid;
	292
	293	if (ia_valid & ATTR_UID)
	294	inode->i_uid = attr->ia_uid;
	295	if (ia_valid & ATTR_GID)
	296	inode->i_gid = attr->ia_gid;
	297	if (ia_valid & ATTR_ATIME)
	298	inode->i_atime = timespec_trunc(attr->ia_atime,
	299	inode->i_sb->s_time_gran);
	300	if (ia_valid & ATTR_MTIME)
	301	inode->i_mtime = timespec_trunc(attr->ia_mtime,
	302	inode->i_sb->s_time_gran);
	303	if (ia_valid & ATTR_CTIME)
	304	inode->i_ctime = timespec_trunc(attr->ia_ctime,
	305	inode->i_sb->s_time_gran);
	306	if (ia_valid & ATTR_MODE) {
	307	umode_t mode = attr->ia_mode;
	308
	309	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	310	mode &= ~S_ISGID;
	311	set_acl_inode(fi, mode);
	312	}
	313	}
	314	#else
	315	#define __setattr_copy setattr_copy
	316	#endif
	317
	318	int f2fs_setattr(struct dentry dentry, struct iattr attr)
	319	{
	320	struct inode *inode = dentry->d_inode;
	321	struct f2fs_inode_info *fi = F2FS_I(inode);
	322	int err;
	323
	324	err = inode_change_ok(inode, attr);
	325	if (err)
	326	return err;
	327
	328	if ((attr->ia_valid & ATTR_SIZE) &&
	329	attr->ia_size != i_size_read(inode)) {
	330	truncate_setsize(inode, attr->ia_size);
	331	f2fs_truncate(inode);
d4686d56	332	f2fs_balance_fs(F2FS_SB(inode->i_sb));
fbfa2cc5 JK	333	}
	334
	335	__setattr_copy(inode, attr);
	336
	337	if (attr->ia_valid & ATTR_MODE) {
	338	err = f2fs_acl_chmod(inode);
	339	if (err \|\| is_inode_flag_set(fi, FI_ACL_MODE)) {
	340	inode->i_mode = fi->i_acl_mode;
	341	clear_inode_flag(fi, FI_ACL_MODE);
	342	}
	343	}
	344
	345	mark_inode_dirty(inode);
	346	return err;
	347	}
	348
	349	const struct inode_operations f2fs_file_inode_operations = {
	350	.getattr = f2fs_getattr,
	351	.setattr = f2fs_setattr,
	352	.get_acl = f2fs_get_acl,
	353	#ifdef CONFIG_F2FS_FS_XATTR
	354	.setxattr = generic_setxattr,
	355	.getxattr = generic_getxattr,
	356	.listxattr = f2fs_listxattr,
	357	.removexattr = generic_removexattr,
	358	#endif
	359	};
	360
	361	static void fill_zero(struct inode *inode, pgoff_t index,
	362	loff_t start, loff_t len)
	363	{
bd43df02	364	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	365	struct page *page;
	366
	367	if (!len)
	368	return;
	369
bd43df02 JK	370	f2fs_balance_fs(sbi);
	371
	372	mutex_lock_op(sbi, DATA_NEW);
fbfa2cc5	373	page = get_new_data_page(inode, index, false);
bd43df02	374	mutex_unlock_op(sbi, DATA_NEW);
fbfa2cc5 JK	375
	376	if (!IS_ERR(page)) {
	377	wait_on_page_writeback(page);
	378	zero_user(page, start, len);
	379	set_page_dirty(page);
	380	f2fs_put_page(page, 1);
	381	}
	382	}
	383
	384	int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
	385	{
	386	pgoff_t index;
	387	int err;
	388
	389	for (index = pg_start; index < pg_end; index++) {
	390	struct dnode_of_data dn;
	391	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	392
9eaeba70 JK	393	f2fs_balance_fs(sbi);
9eaeba70 JK	394
fbfa2cc5 JK	395	mutex_lock_op(sbi, DATA_TRUNC);
fbfa2cc5 JK	396	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	397	err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
fbfa2cc5 JK	398	if (err) {
	399	mutex_unlock_op(sbi, DATA_TRUNC);
	400	if (err == -ENOENT)
	401	continue;
	402	return err;
	403	}
	404
	405	if (dn.data_blkaddr != NULL_ADDR)
	406	truncate_data_blocks_range(&dn, 1);
	407	f2fs_put_dnode(&dn);
	408	mutex_unlock_op(sbi, DATA_TRUNC);
	409	}
	410	return 0;
	411	}
	412
	413	static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
	414	{
	415	pgoff_t pg_start, pg_end;
	416	loff_t off_start, off_end;
	417	int ret = 0;
	418
	419	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	420	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	421
	422	off_start = offset & (PAGE_CACHE_SIZE - 1);
	423	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	424
	425	if (pg_start == pg_end) {
	426	fill_zero(inode, pg_start, off_start,
	427	off_end - off_start);
	428	} else {
	429	if (off_start)
	430	fill_zero(inode, pg_start++, off_start,
	431	PAGE_CACHE_SIZE - off_start);
	432	if (off_end)
	433	fill_zero(inode, pg_end, 0, off_end);
	434
	435	if (pg_start < pg_end) {
	436	struct address_space *mapping = inode->i_mapping;
	437	loff_t blk_start, blk_end;
	438
	439	blk_start = pg_start << PAGE_CACHE_SHIFT;
	440	blk_end = pg_end << PAGE_CACHE_SHIFT;
	441	truncate_inode_pages_range(mapping, blk_start,
	442	blk_end - 1);
	443	ret = truncate_hole(inode, pg_start, pg_end);
	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;
477
478	mutex_lock_op(sbi, DATA_NEW);
479
480	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	481	ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
fbfa2cc5 JK	482	if (ret) {
	483	mutex_unlock_op(sbi, DATA_NEW);
	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);
	491	mutex_unlock_op(sbi, DATA_NEW);
	492	break;
	493	}
	494	}
	495	f2fs_put_dnode(&dn);
	496
	497	mutex_unlock_op(sbi, DATA_NEW);
	498
	499	if (pg_start == pg_end)
	500	new_size = offset + len;
	501	else if (index == pg_start && off_start)
	502	new_size = (index + 1) << PAGE_CACHE_SHIFT;
	503	else if (index == pg_end)
	504	new_size = (index << PAGE_CACHE_SHIFT) + off_end;
	505	else
	506	new_size += PAGE_CACHE_SIZE;
	507	}
	508
	509	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	510	i_size_read(inode) < new_size) {
	511	i_size_write(inode, new_size);
	512	mark_inode_dirty(inode);
	513	}
	514
	515	return ret;
	516	}
	517
	518	static long f2fs_fallocate(struct file *file, int mode,
	519	loff_t offset, loff_t len)
	520	{
6131ffaa	521	struct inode *inode = file_inode(file);
fbfa2cc5 JK	522	long ret;
	523
	524	if (mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE))
	525	return -EOPNOTSUPP;
	526
	527	if (mode & FALLOC_FL_PUNCH_HOLE)
	528	ret = punch_hole(inode, offset, len, mode);
	529	else
	530	ret = expand_inode_data(inode, offset, len, mode);
	531
3af60a49 NJ	532	if (!ret) {
	533	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	534	mark_inode_dirty(inode);
	535	}
fbfa2cc5 JK	536	return ret;
	537	}
	538
	539	#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL \| FS_TOPDIR_FL))
	540	#define F2FS_OTHER_FLMASK (FS_NODUMP_FL \| FS_NOATIME_FL)
	541
	542	static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
	543	{
	544	if (S_ISDIR(mode))
	545	return flags;
	546	else if (S_ISREG(mode))
	547	return flags & F2FS_REG_FLMASK;
	548	else
	549	return flags & F2FS_OTHER_FLMASK;
	550	}
	551
	552	long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	553	{
6131ffaa	554	struct inode *inode = file_inode(filp);
fbfa2cc5 JK	555	struct f2fs_inode_info *fi = F2FS_I(inode);
	556	unsigned int flags;
	557	int ret;
	558
	559	switch (cmd) {
	560	case FS_IOC_GETFLAGS:
	561	flags = fi->i_flags & FS_FL_USER_VISIBLE;
	562	return put_user(flags, (int __user *) arg);
	563	case FS_IOC_SETFLAGS:
	564	{
	565	unsigned int oldflags;
	566
	567	ret = mnt_want_write(filp->f_path.mnt);
	568	if (ret)
	569	return ret;
	570
	571	if (!inode_owner_or_capable(inode)) {
	572	ret = -EACCES;
	573	goto out;
	574	}
	575
	576	if (get_user(flags, (int __user *) arg)) {
	577	ret = -EFAULT;
	578	goto out;
	579	}
	580
	581	flags = f2fs_mask_flags(inode->i_mode, flags);
	582
	583	mutex_lock(&inode->i_mutex);
	584
	585	oldflags = fi->i_flags;
	586
	587	if ((flags ^ oldflags) & (FS_APPEND_FL \| FS_IMMUTABLE_FL)) {
	588	if (!capable(CAP_LINUX_IMMUTABLE)) {
	589	mutex_unlock(&inode->i_mutex);
	590	ret = -EPERM;
	591	goto out;
	592	}
	593	}
	594
	595	flags = flags & FS_FL_USER_MODIFIABLE;
	596	flags \|= oldflags & ~FS_FL_USER_MODIFIABLE;
	597	fi->i_flags = flags;
	598	mutex_unlock(&inode->i_mutex);
	599
	600	f2fs_set_inode_flags(inode);
	601	inode->i_ctime = CURRENT_TIME;
	602	mark_inode_dirty(inode);
	603	out:
	604	mnt_drop_write(filp->f_path.mnt);
	605	return ret;
	606	}
	607	default:
	608	return -ENOTTY;
	609	}
	610	}
	611
e9750824 NJ	612	#ifdef CONFIG_COMPAT
	613	long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	614	{
	615	switch (cmd) {
	616	case F2FS_IOC32_GETFLAGS:
	617	cmd = F2FS_IOC_GETFLAGS;
	618	break;
	619	case F2FS_IOC32_SETFLAGS:
	620	cmd = F2FS_IOC_SETFLAGS;
	621	break;
	622	default:
	623	return -ENOIOCTLCMD;
	624	}
	625	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	626	}
	627	#endif
	628
fbfa2cc5 JK	629	const struct file_operations f2fs_file_operations = {
	630	.llseek = generic_file_llseek,
	631	.read = do_sync_read,
	632	.write = do_sync_write,
	633	.aio_read = generic_file_aio_read,
	634	.aio_write = generic_file_aio_write,
	635	.open = generic_file_open,
	636	.mmap = f2fs_file_mmap,
	637	.fsync = f2fs_sync_file,
	638	.fallocate = f2fs_fallocate,
	639	.unlocked_ioctl = f2fs_ioctl,
e9750824 NJ	640	#ifdef CONFIG_COMPAT
	641	.compat_ioctl = f2fs_compat_ioctl,
	642	#endif
fbfa2cc5 JK	643	.splice_read = generic_file_splice_read,
	644	.splice_write = generic_file_splice_write,
	645	};