[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/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"
#include <trace/events/f2fs.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;

	trace_f2fs_sync_file_enter(inode);
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, 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);
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
	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;

	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
	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, false);
	if (IS_ERR(page))
		return;

	lock_page(page);
	if (page->mapping != inode->i_mapping) {
		f2fs_put_page(page, 1);
		return;
	}
	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;

	trace_f2fs_truncate_blocks_enter(inode, from);

	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);
		trace_f2fs_truncate_blocks_exit(inode, err);
		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);

	trace_f2fs_truncate_blocks_exit(inode, err);
	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;

	trace_f2fs_truncate(inode);

	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);
	}
	trace_f2fs_fallocate(inode, mode, offset, len, ret);
	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_file(filp);
		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_file(filp);
		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"
a2a4a7e4	28	#include <trace/events/f2fs.h>
fbfa2cc5 JK	29
	30	static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
	31	struct vm_fault *vmf)
	32	{
	33	struct page *page = vmf->page;
6131ffaa	34	struct inode *inode = file_inode(vma->vm_file);
fbfa2cc5	35	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	36	block_t old_blk_addr;
fbfa2cc5 JK	37	struct dnode_of_data dn;
39936837	38	int err, ilock;
fbfa2cc5 JK	39
	40	f2fs_balance_fs(sbi);
	41
	42	sb_start_pagefault(inode->i_sb);
	43
fbfa2cc5	44	/* block allocation */
39936837	45	ilock = mutex_lock_op(sbi);
fbfa2cc5	46	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	47	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
fbfa2cc5	48	if (err) {
39936837	49	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	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);
39936837	59	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	60	goto out;
	61	}
	62	}
	63	f2fs_put_dnode(&dn);
39936837	64	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	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	};
fbfa2cc5 JK	104
fbfa2cc5 JK	105	int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
	106	{
	107	struct inode *inode = file->f_mapping->host;
	108	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	109	int ret = 0;
	110	bool need_cp = false;
	111	struct writeback_control wbc = {
	112	.sync_mode = WB_SYNC_ALL,
	113	.nr_to_write = LONG_MAX,
	114	.for_reclaim = 0,
	115	};
	116
1fa95b0b NJ	117	if (inode->i_sb->s_flags & MS_RDONLY)
	118	return 0;
	119
a2a4a7e4	120	trace_f2fs_sync_file_enter(inode);
fbfa2cc5	121	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
a2a4a7e4 NJ	122	if (ret) {
a2a4a7e4 NJ	123	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
fbfa2cc5	124	return ret;
a2a4a7e4	125	}
fbfa2cc5	126
7d82db83 JK	127	/* guarantee free sections for fsync */
	128	f2fs_balance_fs(sbi);
	129
fbfa2cc5 JK	130	mutex_lock(&inode->i_mutex);
fbfa2cc5 JK	131
fbfa2cc5 JK	132	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
	133	goto out;
	134
fbfa2cc5 JK	135	if (!S_ISREG(inode->i_mode) \|\| inode->i_nlink != 1)
fbfa2cc5 JK	136	need_cp = true;
953a3e27	137	else if (is_cp_file(inode))
fbfa2cc5	138	need_cp = true;
facb0205	139	else if (!space_for_roll_forward(sbi))
fbfa2cc5	140	need_cp = true;
953a3e27	141	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
fbfa2cc5 JK	142	need_cp = true;
fbfa2cc5 JK	143
fbfa2cc5 JK	144	if (need_cp) {
	145	/* all the dirty node pages should be flushed for POR */
	146	ret = f2fs_sync_fs(inode->i_sb, 1);
fbfa2cc5	147	} else {
398b1ac5 JK	148	/* if there is no written node page, write its inode page */
	149	while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
	150	ret = f2fs_write_inode(inode, NULL);
	151	if (ret)
	152	goto out;
	153	}
fbfa2cc5 JK	154	filemap_fdatawait_range(sbi->node_inode->i_mapping,
fbfa2cc5 JK	155	0, LONG_MAX);
ae51fb31	156	ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
fbfa2cc5 JK	157	}
	158	out:
	159	mutex_unlock(&inode->i_mutex);
a2a4a7e4	160	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
fbfa2cc5 JK	161	return ret;
	162	}
	163
	164	static int f2fs_file_mmap(struct file file, struct vm_area_struct vma)
	165	{
	166	file_accessed(file);
	167	vma->vm_ops = &f2fs_file_vm_ops;
	168	return 0;
	169	}
	170
	171	static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
	172	{
	173	int nr_free = 0, ofs = dn->ofs_in_node;
	174	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	175	struct f2fs_node *raw_node;
	176	__le32 *addr;
	177
	178	raw_node = page_address(dn->node_page);
	179	addr = blkaddr_in_node(raw_node) + ofs;
	180
	181	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
	182	block_t blkaddr = le32_to_cpu(*addr);
	183	if (blkaddr == NULL_ADDR)
	184	continue;
	185
	186	update_extent_cache(NULL_ADDR, dn);
	187	invalidate_blocks(sbi, blkaddr);
	188	dec_valid_block_count(sbi, dn->inode, 1);
	189	nr_free++;
	190	}
	191	if (nr_free) {
	192	set_page_dirty(dn->node_page);
	193	sync_inode_page(dn);
	194	}
	195	dn->ofs_in_node = ofs;
51dd6249 NJ	196
	197	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
	198	dn->ofs_in_node, nr_free);
fbfa2cc5 JK	199	return nr_free;
	200	}
	201
	202	void truncate_data_blocks(struct dnode_of_data *dn)
	203	{
	204	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
	205	}
	206
	207	static void truncate_partial_data_page(struct inode *inode, u64 from)
	208	{
	209	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	210	struct page *page;
	211
	212	if (!offset)
	213	return;
	214
c718379b	215	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
fbfa2cc5 JK	216	if (IS_ERR(page))
	217	return;
	218
	219	lock_page(page);
afcb7ca0 JK	220	if (page->mapping != inode->i_mapping) {
	221	f2fs_put_page(page, 1);
	222	return;
	223	}
fbfa2cc5 JK	224	wait_on_page_writeback(page);
	225	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	226	set_page_dirty(page);
	227	f2fs_put_page(page, 1);
	228	}
	229
	230	static int truncate_blocks(struct inode *inode, u64 from)
	231	{
	232	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	233	unsigned int blocksize = inode->i_sb->s_blocksize;
	234	struct dnode_of_data dn;
	235	pgoff_t free_from;
39936837	236	int count = 0, ilock = -1;
fbfa2cc5 JK	237	int err;
fbfa2cc5 JK	238
51dd6249 NJ	239	trace_f2fs_truncate_blocks_enter(inode, from);
51dd6249 NJ	240
fbfa2cc5 JK	241	free_from = (pgoff_t)
	242	((from + blocksize - 1) >> (sbi->log_blocksize));
	243
39936837	244	ilock = mutex_lock_op(sbi);
fbfa2cc5	245	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	246	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
fbfa2cc5 JK	247	if (err) {
	248	if (err == -ENOENT)
	249	goto free_next;
39936837	250	mutex_unlock_op(sbi, ilock);
51dd6249	251	trace_f2fs_truncate_blocks_exit(inode, err);
fbfa2cc5 JK	252	return err;
	253	}
	254
	255	if (IS_INODE(dn.node_page))
	256	count = ADDRS_PER_INODE;
	257	else
	258	count = ADDRS_PER_BLOCK;
	259
	260	count -= dn.ofs_in_node;
	261	BUG_ON(count < 0);
39936837	262
fbfa2cc5 JK	263	if (dn.ofs_in_node \|\| IS_INODE(dn.node_page)) {
	264	truncate_data_blocks_range(&dn, count);
	265	free_from += count;
	266	}
	267
	268	f2fs_put_dnode(&dn);
	269	free_next:
	270	err = truncate_inode_blocks(inode, free_from);
39936837	271	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	272
	273	/* lastly zero out the first data page */
	274	truncate_partial_data_page(inode, from);
	275
51dd6249	276	trace_f2fs_truncate_blocks_exit(inode, err);
fbfa2cc5 JK	277	return err;
	278	}
	279
	280	void f2fs_truncate(struct inode *inode)
	281	{
	282	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	283	S_ISLNK(inode->i_mode)))
	284	return;
	285
51dd6249 NJ	286	trace_f2fs_truncate(inode);
51dd6249 NJ	287
fbfa2cc5 JK	288	if (!truncate_blocks(inode, i_size_read(inode))) {
	289	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	290	mark_inode_dirty(inode);
	291	}
fbfa2cc5 JK	292	}
	293
	294	static int f2fs_getattr(struct vfsmount *mnt,
	295	struct dentry dentry, struct kstat stat)
	296	{
	297	struct inode *inode = dentry->d_inode;
	298	generic_fillattr(inode, stat);
	299	stat->blocks <<= 3;
	300	return 0;
	301	}
	302
	303	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	304	static void __setattr_copy(struct inode inode, const struct iattr attr)
	305	{
	306	struct f2fs_inode_info *fi = F2FS_I(inode);
	307	unsigned int ia_valid = attr->ia_valid;
	308
	309	if (ia_valid & ATTR_UID)
	310	inode->i_uid = attr->ia_uid;
	311	if (ia_valid & ATTR_GID)
	312	inode->i_gid = attr->ia_gid;
	313	if (ia_valid & ATTR_ATIME)
	314	inode->i_atime = timespec_trunc(attr->ia_atime,
	315	inode->i_sb->s_time_gran);
	316	if (ia_valid & ATTR_MTIME)
	317	inode->i_mtime = timespec_trunc(attr->ia_mtime,
	318	inode->i_sb->s_time_gran);
	319	if (ia_valid & ATTR_CTIME)
	320	inode->i_ctime = timespec_trunc(attr->ia_ctime,
	321	inode->i_sb->s_time_gran);
	322	if (ia_valid & ATTR_MODE) {
	323	umode_t mode = attr->ia_mode;
	324
	325	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	326	mode &= ~S_ISGID;
	327	set_acl_inode(fi, mode);
	328	}
	329	}
	330	#else
	331	#define __setattr_copy setattr_copy
	332	#endif
	333
	334	int f2fs_setattr(struct dentry dentry, struct iattr attr)
	335	{
	336	struct inode *inode = dentry->d_inode;
	337	struct f2fs_inode_info *fi = F2FS_I(inode);
	338	int err;
	339
	340	err = inode_change_ok(inode, attr);
	341	if (err)
	342	return err;
	343
	344	if ((attr->ia_valid & ATTR_SIZE) &&
	345	attr->ia_size != i_size_read(inode)) {
	346	truncate_setsize(inode, attr->ia_size);
	347	f2fs_truncate(inode);
d4686d56	348	f2fs_balance_fs(F2FS_SB(inode->i_sb));
fbfa2cc5 JK	349	}
	350
	351	__setattr_copy(inode, attr);
	352
	353	if (attr->ia_valid & ATTR_MODE) {
	354	err = f2fs_acl_chmod(inode);
	355	if (err \|\| is_inode_flag_set(fi, FI_ACL_MODE)) {
	356	inode->i_mode = fi->i_acl_mode;
	357	clear_inode_flag(fi, FI_ACL_MODE);
	358	}
	359	}
	360
	361	mark_inode_dirty(inode);
	362	return err;
	363	}
	364
	365	const struct inode_operations f2fs_file_inode_operations = {
	366	.getattr = f2fs_getattr,
	367	.setattr = f2fs_setattr,
	368	.get_acl = f2fs_get_acl,
	369	#ifdef CONFIG_F2FS_FS_XATTR
	370	.setxattr = generic_setxattr,
	371	.getxattr = generic_getxattr,
	372	.listxattr = f2fs_listxattr,
	373	.removexattr = generic_removexattr,
	374	#endif
	375	};
	376
	377	static void fill_zero(struct inode *inode, pgoff_t index,
	378	loff_t start, loff_t len)
	379	{
bd43df02	380	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5	381	struct page *page;
39936837	382	int ilock;
fbfa2cc5 JK	383
	384	if (!len)
	385	return;
	386
bd43df02 JK	387	f2fs_balance_fs(sbi);
bd43df02 JK	388
39936837	389	ilock = mutex_lock_op(sbi);
fbfa2cc5	390	page = get_new_data_page(inode, index, false);
39936837	391	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	392
	393	if (!IS_ERR(page)) {
	394	wait_on_page_writeback(page);
	395	zero_user(page, start, len);
	396	set_page_dirty(page);
	397	f2fs_put_page(page, 1);
	398	}
	399	}
	400
	401	int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
	402	{
	403	pgoff_t index;
	404	int err;
	405
	406	for (index = pg_start; index < pg_end; index++) {
	407	struct dnode_of_data dn;
9eaeba70	408
fbfa2cc5	409	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	410	err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
fbfa2cc5	411	if (err) {
fbfa2cc5 JK	412	if (err == -ENOENT)
	413	continue;
	414	return err;
	415	}
	416
	417	if (dn.data_blkaddr != NULL_ADDR)
	418	truncate_data_blocks_range(&dn, 1);
	419	f2fs_put_dnode(&dn);
fbfa2cc5 JK	420	}
	421	return 0;
	422	}
	423
	424	static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
	425	{
	426	pgoff_t pg_start, pg_end;
	427	loff_t off_start, off_end;
	428	int ret = 0;
	429
	430	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	431	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	432
	433	off_start = offset & (PAGE_CACHE_SIZE - 1);
	434	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	435
	436	if (pg_start == pg_end) {
	437	fill_zero(inode, pg_start, off_start,
	438	off_end - off_start);
	439	} else {
	440	if (off_start)
	441	fill_zero(inode, pg_start++, off_start,
	442	PAGE_CACHE_SIZE - off_start);
	443	if (off_end)
	444	fill_zero(inode, pg_end, 0, off_end);
	445
	446	if (pg_start < pg_end) {
	447	struct address_space *mapping = inode->i_mapping;
	448	loff_t blk_start, blk_end;
1127a3d4	449	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
39936837	450	int ilock;
1127a3d4 JH	451
1127a3d4 JH	452	f2fs_balance_fs(sbi);
fbfa2cc5 JK	453
	454	blk_start = pg_start << PAGE_CACHE_SHIFT;
	455	blk_end = pg_end << PAGE_CACHE_SHIFT;
	456	truncate_inode_pages_range(mapping, blk_start,
	457	blk_end - 1);
39936837 JK	458
39936837 JK	459	ilock = mutex_lock_op(sbi);
fbfa2cc5	460	ret = truncate_hole(inode, pg_start, pg_end);
39936837	461	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	462	}
	463	}
	464
	465	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	466	i_size_read(inode) <= (offset + len)) {
	467	i_size_write(inode, offset);
	468	mark_inode_dirty(inode);
	469	}
	470
	471	return ret;
	472	}
	473
	474	static int expand_inode_data(struct inode *inode, loff_t offset,
	475	loff_t len, int mode)
	476	{
	477	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	478	pgoff_t index, pg_start, pg_end;
	479	loff_t new_size = i_size_read(inode);
	480	loff_t off_start, off_end;
	481	int ret = 0;
	482
	483	ret = inode_newsize_ok(inode, (len + offset));
	484	if (ret)
	485	return ret;
	486
	487	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	488	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	489
	490	off_start = offset & (PAGE_CACHE_SIZE - 1);
	491	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	492
	493	for (index = pg_start; index <= pg_end; index++) {
	494	struct dnode_of_data dn;
39936837	495	int ilock;
fbfa2cc5	496
39936837	497	ilock = mutex_lock_op(sbi);
fbfa2cc5	498	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	499	ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
fbfa2cc5	500	if (ret) {
39936837	501	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	502	break;
	503	}
	504
	505	if (dn.data_blkaddr == NULL_ADDR) {
	506	ret = reserve_new_block(&dn);
	507	if (ret) {
	508	f2fs_put_dnode(&dn);
39936837	509	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	510	break;
	511	}
	512	}
	513	f2fs_put_dnode(&dn);
39936837	514	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	515
	516	if (pg_start == pg_end)
	517	new_size = offset + len;
	518	else if (index == pg_start && off_start)
	519	new_size = (index + 1) << PAGE_CACHE_SHIFT;
	520	else if (index == pg_end)
	521	new_size = (index << PAGE_CACHE_SHIFT) + off_end;
	522	else
	523	new_size += PAGE_CACHE_SIZE;
	524	}
	525
	526	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	527	i_size_read(inode) < new_size) {
	528	i_size_write(inode, new_size);
	529	mark_inode_dirty(inode);
	530	}
	531
	532	return ret;
	533	}
	534
	535	static long f2fs_fallocate(struct file *file, int mode,
	536	loff_t offset, loff_t len)
	537	{
6131ffaa	538	struct inode *inode = file_inode(file);
fbfa2cc5 JK	539	long ret;
	540
	541	if (mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE))
	542	return -EOPNOTSUPP;
	543
	544	if (mode & FALLOC_FL_PUNCH_HOLE)
	545	ret = punch_hole(inode, offset, len, mode);
	546	else
	547	ret = expand_inode_data(inode, offset, len, mode);
	548
3af60a49 NJ	549	if (!ret) {
	550	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	551	mark_inode_dirty(inode);
	552	}
c01e2853	553	trace_f2fs_fallocate(inode, mode, offset, len, ret);
fbfa2cc5 JK	554	return ret;
	555	}
	556
	557	#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL \| FS_TOPDIR_FL))
	558	#define F2FS_OTHER_FLMASK (FS_NODUMP_FL \| FS_NOATIME_FL)
	559
	560	static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
	561	{
	562	if (S_ISDIR(mode))
	563	return flags;
	564	else if (S_ISREG(mode))
	565	return flags & F2FS_REG_FLMASK;
	566	else
	567	return flags & F2FS_OTHER_FLMASK;
	568	}
	569
	570	long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	571	{
6131ffaa	572	struct inode *inode = file_inode(filp);
fbfa2cc5 JK	573	struct f2fs_inode_info *fi = F2FS_I(inode);
	574	unsigned int flags;
	575	int ret;
	576
	577	switch (cmd) {
	578	case FS_IOC_GETFLAGS:
	579	flags = fi->i_flags & FS_FL_USER_VISIBLE;
	580	return put_user(flags, (int __user *) arg);
	581	case FS_IOC_SETFLAGS:
	582	{
	583	unsigned int oldflags;
	584
bdaec334	585	ret = mnt_want_write_file(filp);
fbfa2cc5 JK	586	if (ret)
	587	return ret;
	588
	589	if (!inode_owner_or_capable(inode)) {
	590	ret = -EACCES;
	591	goto out;
	592	}
	593
	594	if (get_user(flags, (int __user *) arg)) {
	595	ret = -EFAULT;
	596	goto out;
	597	}
	598
	599	flags = f2fs_mask_flags(inode->i_mode, flags);
	600
	601	mutex_lock(&inode->i_mutex);
	602
	603	oldflags = fi->i_flags;
	604
	605	if ((flags ^ oldflags) & (FS_APPEND_FL \| FS_IMMUTABLE_FL)) {
	606	if (!capable(CAP_LINUX_IMMUTABLE)) {
	607	mutex_unlock(&inode->i_mutex);
	608	ret = -EPERM;
	609	goto out;
	610	}
	611	}
	612
	613	flags = flags & FS_FL_USER_MODIFIABLE;
	614	flags \|= oldflags & ~FS_FL_USER_MODIFIABLE;
	615	fi->i_flags = flags;
	616	mutex_unlock(&inode->i_mutex);
	617
	618	f2fs_set_inode_flags(inode);
	619	inode->i_ctime = CURRENT_TIME;
	620	mark_inode_dirty(inode);
	621	out:
bdaec334	622	mnt_drop_write_file(filp);
fbfa2cc5 JK	623	return ret;
	624	}
	625	default:
	626	return -ENOTTY;
	627	}
	628	}
	629
e9750824 NJ	630	#ifdef CONFIG_COMPAT
	631	long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	632	{
	633	switch (cmd) {
	634	case F2FS_IOC32_GETFLAGS:
	635	cmd = F2FS_IOC_GETFLAGS;
	636	break;
	637	case F2FS_IOC32_SETFLAGS:
	638	cmd = F2FS_IOC_SETFLAGS;
	639	break;
	640	default:
	641	return -ENOIOCTLCMD;
	642	}
	643	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	644	}
	645	#endif
	646
fbfa2cc5 JK	647	const struct file_operations f2fs_file_operations = {
	648	.llseek = generic_file_llseek,
	649	.read = do_sync_read,
	650	.write = do_sync_write,
	651	.aio_read = generic_file_aio_read,
	652	.aio_write = generic_file_aio_write,
	653	.open = generic_file_open,
	654	.mmap = f2fs_file_mmap,
	655	.fsync = f2fs_sync_file,
	656	.fallocate = f2fs_fallocate,
	657	.unlocked_ioctl = f2fs_ioctl,
e9750824 NJ	658	#ifdef CONFIG_COMPAT
	659	.compat_ioctl = f2fs_compat_ioctl,
	660	#endif
fbfa2cc5 JK	661	.splice_read = generic_file_splice_read,
	662	.splice_write = generic_file_splice_write,
	663	};