[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"
#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);
	struct dnode_of_data dn;
	int err;

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);

	/* block allocation */
	f2fs_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = f2fs_reserve_block(&dn, page->index);
	f2fs_unlock_op(sbi);
	if (err)
		goto out;

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

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

	/* 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);

	trace_f2fs_vm_page_mkwrite(page, DATA);
mapped:
	/* fill the page */
	f2fs_wait_on_page_writeback(page, DATA);
out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(err);
}

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

static int get_parent_ino(struct inode *inode, nid_t *pino)
{
	struct dentry *dentry;

	inode = igrab(inode);
	dentry = d_find_any_alias(inode);
	iput(inode);
	if (!dentry)
		return 0;

	if (update_dent_inode(inode, &dentry->d_name)) {
		dput(dentry);
		return 0;
	}

	*pino = parent_ino(dentry);
	dput(dentry);
	return 1;
}

int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
	struct f2fs_inode_info *fi = F2FS_I(inode);
	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 (unlikely(f2fs_readonly(inode->i_sb)))
		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);

	down_read(&fi->i_sem);

	/*
	 * Both of fdatasync() and fsync() are able to be recovered from
	 * sudden-power-off.
	 */
	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
		need_cp = true;
	else if (file_wrong_pino(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;
	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
		need_cp = true;

	up_read(&fi->i_sem);

	if (need_cp) {
		nid_t pino;

		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);

		down_write(&fi->i_sem);
		F2FS_I(inode)->xattr_ver = 0;
		if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
					get_parent_ino(inode, &pino)) {
			F2FS_I(inode)->i_pino = pino;
			file_got_pino(inode);
			up_write(&fi->i_sem);
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		} else {
			up_write(&fi->i_sem);
		}
	} else {
		/* if there is no written node page, write its inode page */
		while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		}
		ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
		if (ret)
			goto out;
		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
	}
out:
	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;
}

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 = F2FS_NODE(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);
		nr_free++;
	}
	if (nr_free) {
		dec_valid_block_count(sbi, dn->inode, 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 (unlikely(page->mapping != inode->i_mapping)) {
		f2fs_put_page(page, 1);
		return;
	}
	f2fs_wait_on_page_writeback(page, DATA);
	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	set_page_dirty(page);
	f2fs_put_page(page, 1);
}

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, err = 0;

	trace_f2fs_truncate_blocks_enter(inode, from);

	if (f2fs_has_inline_data(inode))
		goto done;

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

	f2fs_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;
		f2fs_unlock_op(sbi);
		trace_f2fs_truncate_blocks_exit(inode, err);
		return err;
	}

	if (IS_INODE(dn.node_page))
		count = ADDRS_PER_INODE(F2FS_I(inode));
	else
		count = ADDRS_PER_BLOCK;

	count -= dn.ofs_in_node;
	f2fs_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);
	f2fs_unlock_op(sbi);
done:
	/* 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);
	}
}

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)) {
		err = f2fs_convert_inline_data(inode, attr->ia_size);
		if (err)
			return err;

		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 = posix_acl_chmod(inode, get_inode_mode(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,
	.set_acl	= f2fs_set_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);

	f2fs_lock_op(sbi);
	page = get_new_data_page(inode, NULL, index, false);
	f2fs_unlock_op(sbi);

	if (!IS_ERR(page)) {
		f2fs_wait_on_page_writeback(page, DATA);
		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)
{
	pgoff_t pg_start, pg_end;
	loff_t off_start, off_end;
	int ret = 0;

	ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1);
	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);

	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);

			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);

			f2fs_lock_op(sbi);
			ret = truncate_hole(inode, pg_start, pg_end);
			f2fs_unlock_op(sbi);
		}
	}

	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;

	ret = f2fs_convert_inline_data(inode, offset + len);
	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;

		f2fs_lock_op(sbi);
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		ret = f2fs_reserve_block(&dn, index);
		f2fs_unlock_op(sbi);
		if (ret)
			break;

		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;

	mutex_lock(&inode->i_mutex);

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

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

	mutex_unlock(&inode->i_mutex);

	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 F2FS_IOC_GETFLAGS:
		flags = fi->i_flags & FS_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case F2FS_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	36	struct dnode_of_data dn;
e479556b	37	int err;
fbfa2cc5 JK	38
	39	f2fs_balance_fs(sbi);
	40
	41	sb_start_pagefault(inode->i_sb);
	42
fbfa2cc5	43	/* block allocation */
e479556b	44	f2fs_lock_op(sbi);
fbfa2cc5	45	set_new_dnode(&dn, inode, NULL, NULL, 0);
b600965c	46	err = f2fs_reserve_block(&dn, page->index);
e479556b	47	f2fs_unlock_op(sbi);
b600965c HL	48	if (err)
b600965c HL	49	goto out;
fbfa2cc5	50
9851e6e1	51	file_update_time(vma->vm_file);
fbfa2cc5	52	lock_page(page);
6bacf52f	53	if (unlikely(page->mapping != inode->i_mapping \|\|
9851e6e1	54	page_offset(page) > i_size_read(inode) \|\|
6bacf52f	55	!PageUptodate(page))) {
fbfa2cc5 JK	56	unlock_page(page);
	57	err = -EFAULT;
	58	goto out;
	59	}
	60
	61	/*
	62	* check to see if the page is mapped already (no holes)
	63	*/
	64	if (PageMappedToDisk(page))
9851e6e1	65	goto mapped;
fbfa2cc5 JK	66
	67	/* page is wholly or partially inside EOF */
	68	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
	69	unsigned offset;
	70	offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
	71	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	72	}
	73	set_page_dirty(page);
	74	SetPageUptodate(page);
	75
e943a10d	76	trace_f2fs_vm_page_mkwrite(page, DATA);
9851e6e1 NJ	77	mapped:
9851e6e1 NJ	78	/* fill the page */
3cb5ad15	79	f2fs_wait_on_page_writeback(page, DATA);
fbfa2cc5 JK	80	out:
	81	sb_end_pagefault(inode->i_sb);
	82	return block_page_mkwrite_return(err);
	83	}
	84
	85	static const struct vm_operations_struct f2fs_file_vm_ops = {
692bb55d JK	86	.fault = filemap_fault,
	87	.page_mkwrite = f2fs_vm_page_mkwrite,
	88	.remap_pages = generic_file_remap_pages,
fbfa2cc5 JK	89	};
fbfa2cc5 JK	90
354a3399 JK	91	static int get_parent_ino(struct inode inode, nid_t pino)
	92	{
	93	struct dentry *dentry;
	94
	95	inode = igrab(inode);
	96	dentry = d_find_any_alias(inode);
	97	iput(inode);
	98	if (!dentry)
	99	return 0;
	100
f0947e5c JK	101	if (update_dent_inode(inode, &dentry->d_name)) {
	102	dput(dentry);
	103	return 0;
	104	}
354a3399	105
f0947e5c JK	106	*pino = parent_ino(dentry);
f0947e5c JK	107	dput(dentry);
354a3399 JK	108	return 1;
	109	}
	110
fbfa2cc5 JK	111	int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
	112	{
	113	struct inode *inode = file->f_mapping->host;
d928bfbf	114	struct f2fs_inode_info *fi = F2FS_I(inode);
fbfa2cc5	115	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	116	int ret = 0;
	117	bool need_cp = false;
	118	struct writeback_control wbc = {
c81bf1c8	119	.sync_mode = WB_SYNC_ALL,
fbfa2cc5 JK	120	.nr_to_write = LONG_MAX,
	121	.for_reclaim = 0,
	122	};
	123
6bacf52f	124	if (unlikely(f2fs_readonly(inode->i_sb)))
1fa95b0b NJ	125	return 0;
1fa95b0b NJ	126
a2a4a7e4	127	trace_f2fs_sync_file_enter(inode);
fbfa2cc5	128	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
a2a4a7e4 NJ	129	if (ret) {
a2a4a7e4 NJ	130	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
fbfa2cc5	131	return ret;
a2a4a7e4	132	}
fbfa2cc5	133
7d82db83 JK	134	/* guarantee free sections for fsync */
	135	f2fs_balance_fs(sbi);
	136
d928bfbf	137	down_read(&fi->i_sem);
fbfa2cc5	138
e5d2385e JK	139	/*
	140	* Both of fdatasync() and fsync() are able to be recovered from
	141	* sudden-power-off.
	142	*/
fbfa2cc5 JK	143	if (!S_ISREG(inode->i_mode) \|\| inode->i_nlink != 1)
fbfa2cc5 JK	144	need_cp = true;
354a3399	145	else if (file_wrong_pino(inode))
fbfa2cc5	146	need_cp = true;
facb0205	147	else if (!space_for_roll_forward(sbi))
fbfa2cc5	148	need_cp = true;
953a3e27	149	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
fbfa2cc5	150	need_cp = true;
d71b5564	151	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
e518ff81	152	need_cp = true;
fbfa2cc5	153
d928bfbf JK	154	up_read(&fi->i_sem);
d928bfbf JK	155
fbfa2cc5	156	if (need_cp) {
354a3399 JK	157	nid_t pino;
354a3399 JK	158
fbfa2cc5 JK	159	/* all the dirty node pages should be flushed for POR */
fbfa2cc5 JK	160	ret = f2fs_sync_fs(inode->i_sb, 1);
d928bfbf JK	161
	162	down_write(&fi->i_sem);
	163	F2FS_I(inode)->xattr_ver = 0;
354a3399 JK	164	if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
	165	get_parent_ino(inode, &pino)) {
	166	F2FS_I(inode)->i_pino = pino;
	167	file_got_pino(inode);
d928bfbf	168	up_write(&fi->i_sem);
354a3399 JK	169	mark_inode_dirty_sync(inode);
	170	ret = f2fs_write_inode(inode, NULL);
	171	if (ret)
	172	goto out;
d928bfbf JK	173	} else {
d928bfbf JK	174	up_write(&fi->i_sem);
354a3399	175	}
fbfa2cc5	176	} else {
398b1ac5 JK	177	/* if there is no written node page, write its inode page */
398b1ac5 JK	178	while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
b3783873	179	mark_inode_dirty_sync(inode);
398b1ac5 JK	180	ret = f2fs_write_inode(inode, NULL);
	181	if (ret)
	182	goto out;
	183	}
cfe58f9d JK	184	ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
	185	if (ret)
	186	goto out;
ae51fb31	187	ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
fbfa2cc5 JK	188	}
fbfa2cc5 JK	189	out:
a2a4a7e4	190	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
fbfa2cc5 JK	191	return ret;
	192	}
	193
	194	static int f2fs_file_mmap(struct file file, struct vm_area_struct vma)
	195	{
	196	file_accessed(file);
	197	vma->vm_ops = &f2fs_file_vm_ops;
	198	return 0;
	199	}
	200
b292dcab	201	int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
fbfa2cc5 JK	202	{
	203	int nr_free = 0, ofs = dn->ofs_in_node;
	204	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	205	struct f2fs_node *raw_node;
	206	__le32 *addr;
	207
45590710	208	raw_node = F2FS_NODE(dn->node_page);
fbfa2cc5 JK	209	addr = blkaddr_in_node(raw_node) + ofs;
fbfa2cc5 JK	210
6c311ec6	211	for (; count > 0; count--, addr++, dn->ofs_in_node++) {
fbfa2cc5 JK	212	block_t blkaddr = le32_to_cpu(*addr);
	213	if (blkaddr == NULL_ADDR)
	214	continue;
	215
	216	update_extent_cache(NULL_ADDR, dn);
	217	invalidate_blocks(sbi, blkaddr);
fbfa2cc5 JK	218	nr_free++;
	219	}
	220	if (nr_free) {
d7cc950b	221	dec_valid_block_count(sbi, dn->inode, nr_free);
fbfa2cc5 JK	222	set_page_dirty(dn->node_page);
	223	sync_inode_page(dn);
	224	}
	225	dn->ofs_in_node = ofs;
51dd6249 NJ	226
	227	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
	228	dn->ofs_in_node, nr_free);
fbfa2cc5 JK	229	return nr_free;
	230	}
	231
	232	void truncate_data_blocks(struct dnode_of_data *dn)
	233	{
	234	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
	235	}
	236
	237	static void truncate_partial_data_page(struct inode *inode, u64 from)
	238	{
	239	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	240	struct page *page;
	241
	242	if (!offset)
	243	return;
	244
c718379b	245	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
fbfa2cc5 JK	246	if (IS_ERR(page))
	247	return;
	248
	249	lock_page(page);
6bacf52f	250	if (unlikely(page->mapping != inode->i_mapping)) {
afcb7ca0 JK	251	f2fs_put_page(page, 1);
	252	return;
	253	}
3cb5ad15	254	f2fs_wait_on_page_writeback(page, DATA);
fbfa2cc5 JK	255	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	256	set_page_dirty(page);
	257	f2fs_put_page(page, 1);
	258	}
	259
1e1bb4ba	260	int truncate_blocks(struct inode *inode, u64 from)
fbfa2cc5 JK	261	{
	262	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	263	unsigned int blocksize = inode->i_sb->s_blocksize;
	264	struct dnode_of_data dn;
	265	pgoff_t free_from;
9ffe0fb5	266	int count = 0, err = 0;
fbfa2cc5	267
51dd6249 NJ	268	trace_f2fs_truncate_blocks_enter(inode, from);
51dd6249 NJ	269
f185ff97 JK	270	if (f2fs_has_inline_data(inode))
	271	goto done;
	272
fbfa2cc5 JK	273	free_from = (pgoff_t)
	274	((from + blocksize - 1) >> (sbi->log_blocksize));
	275
e479556b	276	f2fs_lock_op(sbi);
9ffe0fb5	277
fbfa2cc5	278	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	279	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
fbfa2cc5 JK	280	if (err) {
	281	if (err == -ENOENT)
	282	goto free_next;
e479556b	283	f2fs_unlock_op(sbi);
51dd6249	284	trace_f2fs_truncate_blocks_exit(inode, err);
fbfa2cc5 JK	285	return err;
	286	}
	287
	288	if (IS_INODE(dn.node_page))
de93653f	289	count = ADDRS_PER_INODE(F2FS_I(inode));
fbfa2cc5 JK	290	else
	291	count = ADDRS_PER_BLOCK;
	292
	293	count -= dn.ofs_in_node;
5d56b671	294	f2fs_bug_on(count < 0);
39936837	295
fbfa2cc5 JK	296	if (dn.ofs_in_node \|\| IS_INODE(dn.node_page)) {
	297	truncate_data_blocks_range(&dn, count);
	298	free_from += count;
	299	}
	300
	301	f2fs_put_dnode(&dn);
	302	free_next:
	303	err = truncate_inode_blocks(inode, free_from);
e479556b	304	f2fs_unlock_op(sbi);
f185ff97	305	done:
fbfa2cc5 JK	306	/* lastly zero out the first data page */
	307	truncate_partial_data_page(inode, from);
	308
51dd6249	309	trace_f2fs_truncate_blocks_exit(inode, err);
fbfa2cc5 JK	310	return err;
	311	}
	312
	313	void f2fs_truncate(struct inode *inode)
	314	{
	315	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	316	S_ISLNK(inode->i_mode)))
	317	return;
	318
51dd6249 NJ	319	trace_f2fs_truncate(inode);
51dd6249 NJ	320
fbfa2cc5 JK	321	if (!truncate_blocks(inode, i_size_read(inode))) {
	322	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	323	mark_inode_dirty(inode);
	324	}
fbfa2cc5 JK	325	}
fbfa2cc5 JK	326
2d4d9fb5	327	int f2fs_getattr(struct vfsmount *mnt,
fbfa2cc5 JK	328	struct dentry dentry, struct kstat stat)
	329	{
	330	struct inode *inode = dentry->d_inode;
	331	generic_fillattr(inode, stat);
	332	stat->blocks <<= 3;
	333	return 0;
	334	}
	335
	336	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	337	static void __setattr_copy(struct inode inode, const struct iattr attr)
	338	{
	339	struct f2fs_inode_info *fi = F2FS_I(inode);
	340	unsigned int ia_valid = attr->ia_valid;
	341
	342	if (ia_valid & ATTR_UID)
	343	inode->i_uid = attr->ia_uid;
	344	if (ia_valid & ATTR_GID)
	345	inode->i_gid = attr->ia_gid;
	346	if (ia_valid & ATTR_ATIME)
	347	inode->i_atime = timespec_trunc(attr->ia_atime,
	348	inode->i_sb->s_time_gran);
	349	if (ia_valid & ATTR_MTIME)
	350	inode->i_mtime = timespec_trunc(attr->ia_mtime,
	351	inode->i_sb->s_time_gran);
	352	if (ia_valid & ATTR_CTIME)
	353	inode->i_ctime = timespec_trunc(attr->ia_ctime,
	354	inode->i_sb->s_time_gran);
	355	if (ia_valid & ATTR_MODE) {
	356	umode_t mode = attr->ia_mode;
	357
	358	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	359	mode &= ~S_ISGID;
	360	set_acl_inode(fi, mode);
	361	}
	362	}
	363	#else
	364	#define __setattr_copy setattr_copy
	365	#endif
	366
	367	int f2fs_setattr(struct dentry dentry, struct iattr attr)
	368	{
	369	struct inode *inode = dentry->d_inode;
	370	struct f2fs_inode_info *fi = F2FS_I(inode);
	371	int err;
	372
	373	err = inode_change_ok(inode, attr);
	374	if (err)
	375	return err;
	376
	377	if ((attr->ia_valid & ATTR_SIZE) &&
	378	attr->ia_size != i_size_read(inode)) {
9e09fc85 JK	379	err = f2fs_convert_inline_data(inode, attr->ia_size);
	380	if (err)
	381	return err;
9ffe0fb5	382
fbfa2cc5	383	truncate_setsize(inode, attr->ia_size);
9e09fc85	384	f2fs_truncate(inode);
d4686d56	385	f2fs_balance_fs(F2FS_SB(inode->i_sb));
fbfa2cc5 JK	386	}
	387
	388	__setattr_copy(inode, attr);
	389
	390	if (attr->ia_valid & ATTR_MODE) {
a6dda0e6	391	err = posix_acl_chmod(inode, get_inode_mode(inode));
fbfa2cc5 JK	392	if (err \|\| is_inode_flag_set(fi, FI_ACL_MODE)) {
	393	inode->i_mode = fi->i_acl_mode;
	394	clear_inode_flag(fi, FI_ACL_MODE);
	395	}
	396	}
	397
	398	mark_inode_dirty(inode);
	399	return err;
	400	}
	401
	402	const struct inode_operations f2fs_file_inode_operations = {
	403	.getattr = f2fs_getattr,
	404	.setattr = f2fs_setattr,
	405	.get_acl = f2fs_get_acl,
a6dda0e6	406	.set_acl = f2fs_set_acl,
fbfa2cc5 JK	407	#ifdef CONFIG_F2FS_FS_XATTR
	408	.setxattr = generic_setxattr,
	409	.getxattr = generic_getxattr,
	410	.listxattr = f2fs_listxattr,
	411	.removexattr = generic_removexattr,
	412	#endif
	413	};
	414
	415	static void fill_zero(struct inode *inode, pgoff_t index,
	416	loff_t start, loff_t len)
	417	{
bd43df02	418	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	419	struct page *page;
	420
	421	if (!len)
	422	return;
	423
bd43df02 JK	424	f2fs_balance_fs(sbi);
bd43df02 JK	425
e479556b	426	f2fs_lock_op(sbi);
64aa7ed9	427	page = get_new_data_page(inode, NULL, index, false);
e479556b	428	f2fs_unlock_op(sbi);
fbfa2cc5 JK	429
fbfa2cc5 JK	430	if (!IS_ERR(page)) {
3cb5ad15	431	f2fs_wait_on_page_writeback(page, DATA);
fbfa2cc5 JK	432	zero_user(page, start, len);
	433	set_page_dirty(page);
	434	f2fs_put_page(page, 1);
	435	}
	436	}
	437
	438	int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
	439	{
	440	pgoff_t index;
	441	int err;
	442
	443	for (index = pg_start; index < pg_end; index++) {
	444	struct dnode_of_data dn;
9eaeba70	445
fbfa2cc5	446	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	447	err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
fbfa2cc5	448	if (err) {
fbfa2cc5 JK	449	if (err == -ENOENT)
	450	continue;
	451	return err;
	452	}
	453
	454	if (dn.data_blkaddr != NULL_ADDR)
	455	truncate_data_blocks_range(&dn, 1);
	456	f2fs_put_dnode(&dn);
fbfa2cc5 JK	457	}
	458	return 0;
	459	}
	460
a66c7b2f	461	static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
fbfa2cc5 JK	462	{
	463	pgoff_t pg_start, pg_end;
	464	loff_t off_start, off_end;
	465	int ret = 0;
	466
9e09fc85	467	ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1);
8230a0a4 JK	468	if (ret)
8230a0a4 JK	469	return ret;
9ffe0fb5	470
fbfa2cc5 JK	471	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	472	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	473
	474	off_start = offset & (PAGE_CACHE_SIZE - 1);
	475	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	476
	477	if (pg_start == pg_end) {
	478	fill_zero(inode, pg_start, off_start,
	479	off_end - off_start);
	480	} else {
	481	if (off_start)
	482	fill_zero(inode, pg_start++, off_start,
	483	PAGE_CACHE_SIZE - off_start);
	484	if (off_end)
	485	fill_zero(inode, pg_end, 0, off_end);
	486
	487	if (pg_start < pg_end) {
	488	struct address_space *mapping = inode->i_mapping;
	489	loff_t blk_start, blk_end;
1127a3d4 JH	490	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	491
	492	f2fs_balance_fs(sbi);
fbfa2cc5 JK	493
	494	blk_start = pg_start << PAGE_CACHE_SHIFT;
	495	blk_end = pg_end << PAGE_CACHE_SHIFT;
	496	truncate_inode_pages_range(mapping, blk_start,
	497	blk_end - 1);
39936837	498
e479556b	499	f2fs_lock_op(sbi);
fbfa2cc5	500	ret = truncate_hole(inode, pg_start, pg_end);
e479556b	501	f2fs_unlock_op(sbi);
fbfa2cc5 JK	502	}
	503	}
	504
fbfa2cc5 JK	505	return ret;
	506	}
	507
	508	static int expand_inode_data(struct inode *inode, loff_t offset,
	509	loff_t len, int mode)
	510	{
	511	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	512	pgoff_t index, pg_start, pg_end;
	513	loff_t new_size = i_size_read(inode);
	514	loff_t off_start, off_end;
	515	int ret = 0;
	516
	517	ret = inode_newsize_ok(inode, (len + offset));
	518	if (ret)
	519	return ret;
	520
9e09fc85 JK	521	ret = f2fs_convert_inline_data(inode, offset + len);
	522	if (ret)
	523	return ret;
	524
fbfa2cc5 JK	525	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	526	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	527
	528	off_start = offset & (PAGE_CACHE_SIZE - 1);
	529	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	530
	531	for (index = pg_start; index <= pg_end; index++) {
	532	struct dnode_of_data dn;
	533
e479556b	534	f2fs_lock_op(sbi);
fbfa2cc5	535	set_new_dnode(&dn, inode, NULL, NULL, 0);
b600965c HL	536	ret = f2fs_reserve_block(&dn, index);
	537	f2fs_unlock_op(sbi);
	538	if (ret)
fbfa2cc5	539	break;
fbfa2cc5	540
fbfa2cc5 JK	541	if (pg_start == pg_end)
	542	new_size = offset + len;
	543	else if (index == pg_start && off_start)
	544	new_size = (index + 1) << PAGE_CACHE_SHIFT;
	545	else if (index == pg_end)
	546	new_size = (index << PAGE_CACHE_SHIFT) + off_end;
	547	else
	548	new_size += PAGE_CACHE_SIZE;
	549	}
	550
	551	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	552	i_size_read(inode) < new_size) {
	553	i_size_write(inode, new_size);
	554	mark_inode_dirty(inode);
	555	}
	556
	557	return ret;
	558	}
	559
	560	static long f2fs_fallocate(struct file *file, int mode,
	561	loff_t offset, loff_t len)
	562	{
6131ffaa	563	struct inode *inode = file_inode(file);
fbfa2cc5 JK	564	long ret;
	565
	566	if (mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE))
	567	return -EOPNOTSUPP;
	568
3375f696 CY	569	mutex_lock(&inode->i_mutex);
3375f696 CY	570
fbfa2cc5	571	if (mode & FALLOC_FL_PUNCH_HOLE)
a66c7b2f	572	ret = punch_hole(inode, offset, len);
fbfa2cc5 JK	573	else
	574	ret = expand_inode_data(inode, offset, len, mode);
	575
3af60a49 NJ	576	if (!ret) {
	577	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	578	mark_inode_dirty(inode);
	579	}
3375f696 CY	580
	581	mutex_unlock(&inode->i_mutex);
	582
c01e2853	583	trace_f2fs_fallocate(inode, mode, offset, len, ret);
fbfa2cc5 JK	584	return ret;
	585	}
	586
	587	#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL \| FS_TOPDIR_FL))
	588	#define F2FS_OTHER_FLMASK (FS_NODUMP_FL \| FS_NOATIME_FL)
	589
	590	static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
	591	{
	592	if (S_ISDIR(mode))
	593	return flags;
	594	else if (S_ISREG(mode))
	595	return flags & F2FS_REG_FLMASK;
	596	else
	597	return flags & F2FS_OTHER_FLMASK;
	598	}
	599
	600	long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	601	{
6131ffaa	602	struct inode *inode = file_inode(filp);
fbfa2cc5 JK	603	struct f2fs_inode_info *fi = F2FS_I(inode);
	604	unsigned int flags;
	605	int ret;
	606
	607	switch (cmd) {
6a3e8ef0	608	case F2FS_IOC_GETFLAGS:
fbfa2cc5 JK	609	flags = fi->i_flags & FS_FL_USER_VISIBLE;
fbfa2cc5 JK	610	return put_user(flags, (int __user *) arg);
6a3e8ef0	611	case F2FS_IOC_SETFLAGS:
fbfa2cc5 JK	612	{
	613	unsigned int oldflags;
	614
bdaec334	615	ret = mnt_want_write_file(filp);
fbfa2cc5 JK	616	if (ret)
	617	return ret;
	618
	619	if (!inode_owner_or_capable(inode)) {
	620	ret = -EACCES;
	621	goto out;
	622	}
	623
	624	if (get_user(flags, (int __user *) arg)) {
	625	ret = -EFAULT;
	626	goto out;
	627	}
	628
	629	flags = f2fs_mask_flags(inode->i_mode, flags);
	630
	631	mutex_lock(&inode->i_mutex);
	632
	633	oldflags = fi->i_flags;
	634
	635	if ((flags ^ oldflags) & (FS_APPEND_FL \| FS_IMMUTABLE_FL)) {
	636	if (!capable(CAP_LINUX_IMMUTABLE)) {
	637	mutex_unlock(&inode->i_mutex);
	638	ret = -EPERM;
	639	goto out;
	640	}
	641	}
	642
	643	flags = flags & FS_FL_USER_MODIFIABLE;
	644	flags \|= oldflags & ~FS_FL_USER_MODIFIABLE;
	645	fi->i_flags = flags;
	646	mutex_unlock(&inode->i_mutex);
	647
	648	f2fs_set_inode_flags(inode);
	649	inode->i_ctime = CURRENT_TIME;
	650	mark_inode_dirty(inode);
	651	out:
bdaec334	652	mnt_drop_write_file(filp);
fbfa2cc5 JK	653	return ret;
	654	}
	655	default:
	656	return -ENOTTY;
	657	}
	658	}
	659
e9750824 NJ	660	#ifdef CONFIG_COMPAT
	661	long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	662	{
	663	switch (cmd) {
	664	case F2FS_IOC32_GETFLAGS:
	665	cmd = F2FS_IOC_GETFLAGS;
	666	break;
	667	case F2FS_IOC32_SETFLAGS:
	668	cmd = F2FS_IOC_SETFLAGS;
	669	break;
	670	default:
	671	return -ENOIOCTLCMD;
	672	}
	673	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	674	}
	675	#endif
	676
fbfa2cc5 JK	677	const struct file_operations f2fs_file_operations = {
	678	.llseek = generic_file_llseek,
	679	.read = do_sync_read,
	680	.write = do_sync_write,
	681	.aio_read = generic_file_aio_read,
	682	.aio_write = generic_file_aio_write,
	683	.open = generic_file_open,
	684	.mmap = f2fs_file_mmap,
	685	.fsync = f2fs_sync_file,
	686	.fallocate = f2fs_fallocate,
	687	.unlocked_ioctl = f2fs_ioctl,
e9750824 NJ	688	#ifdef CONFIG_COMPAT
	689	.compat_ioctl = f2fs_compat_ioctl,
	690	#endif
fbfa2cc5 JK	691	.splice_read = generic_file_splice_read,
	692	.splice_write = generic_file_splice_write,
	693	};