path: root/fs/f2fs/namei.c

// SPDX-License-Identifier: GPL-2.0
/*
 * fs/f2fs/namei.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 */
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/random.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/quotaops.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/f2fs.h>

static inline int is_extension_exist(const unsigned char *s, const char *sub,
						bool tmp_ext)
{
	size_t slen = strlen(s);
	size_t sublen = strlen(sub);
	int i;

	if (sublen == 1 && *sub == '*')
		return 1;

	/*
	 * filename format of multimedia file should be defined as:
	 * "filename + '.' + extension + (optional: '.' + temp extension)".
	 */
	if (slen < sublen + 2)
		return 0;

	if (!tmp_ext) {
		/* file has no temp extension */
		if (s[slen - sublen - 1] != '.')
			return 0;
		return !strncasecmp(s + slen - sublen, sub, sublen);
	}

	for (i = 1; i < slen - sublen; i++) {
		if (s[i] != '.')
			continue;
		if (!strncasecmp(s + i + 1, sub, sublen))
			return 1;
	}

	return 0;
}

int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
							bool hot, bool set)
{
	__u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
	int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
	int