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/**
* libf2fs.c
*
* Copyright (c) 2013 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.
*/
#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <mntent.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#include <linux/hdreg.h>
#include <linux/fs.h>
#include "f2fs_fs.h"
struct f2fs_configuration config;
void ASCIIToUNICODE(u_int16_t *out_buf, u_int8_t *in_buf)
{
u_int8_t *pchTempPtr = in_buf;
u_int16_t *pwTempPtr = out_buf;
while (*pchTempPtr != '\0') {
*pwTempPtr = (u_int16_t)*pchTempPtr;
pchTempPtr++;
pwTempPtr++;
}
*pwTempPtr = '\0';
return;
}
int log_base_2(u_int32_t num)
{
int ret = 0;
if (num <= 0 || (num & (num - 1)) != 0)
return -1;
while (num >>= 1)
ret++;
return ret;
}
/*
* f2fs bit operations
*/
int f2fs_test_bit(unsigned int nr, const char *p)
{
int mask;
char *addr = (char *)p;
addr += (nr >> 3);
mask = 1 << (7 - (nr & 0x07));
return (mask & *addr) != 0;
}
int f2fs_set_bit(unsigned int nr, unsigned char *addr)
{
int mask;
int ret;
addr += (nr >> 3);
mask = 1 << (7 - (nr & 0x07));
ret = mask & *addr;
*addr |= mask;
return ret;
}
int f2fs_clear_bit(unsigned int nr, char *addr)
{
int mask;
int ret;
addr += (nr >> 3);
mask = 1 << (7 - (nr & 0x07));
ret = mask & *addr;
*addr &= ~mask;
return ret;
}
/*
* CRC32
*/
#define CRCPOLY_LE 0xedb88320
u_int32_t f2fs_cal_crc32(u_int32_t crc, void *buf, int len)
{
int i;
unsigned char *p = (unsigned char *)buf;
while (len--) {
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
}
return crc;
}
/*
* device information
*/
void f2fs_init_configuration(struct f2fs_configuration *c)
{
c->sector_size = DEFAULT_SECTOR_SIZE;
c->sectors_per_blk = DEFAULT_SECTORS_PER_BLOCK;
c->blks_per_seg = DEFAULT_BLOCKS_PER_SEGMENT;
/* calculated by overprovision ratio */
c->reserved_segments = 48;
c->overprovision = 5;
c->segs_per_sec = 1;
c->secs_per_zone = 1;
c->heap = 1;
memset(c->vol_label, 0, sizeof(c->vol_label));
c->vol_label[0] = 'F';
c->vol_label[1] = '2';
c->vol_label[2] = 'F';
c->vol_label[3] = 'S';
c->vol_label[4] = '\0';
c->device_name = NULL;
}
int f2fs_dev_is_mounted(struct f2fs_configuration *c)
{
FILE *file = NULL;
struct mntent *mnt = NULL;
file = setmntent(MOUNTED, "r");
if (file == NULL)
return 0;
while (1) {
mnt = getmntent(file);
if (mnt == NULL)
break;
if (!strcmp(c->device_name, mnt->mnt_fsname)) {
endmntent(file);
return -1;
}
}
endmntent(file);
return 0;
}
int f2fs_get_device_info(struct f2fs_configuration *c)
{
int32_t fd = 0;
int32_t sector_size;
struct stat stat_buf;
struct hd_geometry geom;
fd = open(c->device_name, O_RDWR);
if (fd < 0) {
MSG(0, "\tError: Failed to open the device!\n");
return -1;
}
c->fd = fd;
if (fstat(fd, &stat_buf) < 0 ) {
MSG(0, "\tError: Failed to get the device stat!\n");
return -1;
}
if (S_ISREG(stat_buf.st_mode)) {
c->total_sectors = stat_buf.st_size / c->sector_size;
} else if (S_ISBLK(stat_buf.st_mode)) {
if (ioctl(fd, BLKSSZGET, §or_size) < 0) {
MSG(0, "\tError: Using the default sector size\n");
} else {
if (c->sector_size < sector_size) {
MSG(0, "\tError: Cannot set the sector size to:"
" %d as the device does not support"
"\nSetting the sector size to : %d\n",
c->sector_size, sector_size);
c->sector_size = sector_size;
c->sectors_per_blk = PAGE_SIZE / sector_size;
}
}
if (ioctl(fd, BLKGETSIZE, &c->total_sectors) < 0) {
MSG(0, "\tError: Cannot get the device size\n");
return -1;
}
if (ioctl(fd, HDIO_GETGEO, &geom) < 0)
c->start_sector = 0;
else
c->start_sector = geom.start;
} else {
MSG(0, "\tError: Volume type is not supported!!!\n");
return -1;
}
MSG(0, "Info: sector size = %u\n", c->sector_size);
MSG(0, "Info: total sectors = %"PRIu64" (in 512bytes)\n",
c->total_sectors);
if (c->total_sectors <
(F2FS_MIN_VOLUME_SIZE / DEFAULT_SECTOR_SIZE)) {
MSG(0, "Error: Min volume size supported is %d\n",
F2FS_MIN_VOLUME_SIZE);
return -1;
}
return 0;
}
/*
* IO interfaces
*/
int dev_read(int fd, void *buf, __u64 offset, size_t len)
{
if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0)
return -1;
if (read(fd, buf, len) < 0)
return -1;
return 0;
}
int dev_write(int fd, void *buf, __u64 offset, size_t len)
{
if (lseek64(fd, (off64_t)offset, SEEK_SET) < 0)
return -1;
if (write(fd, buf, len) < 0)
return -1;
return 0;
}
int dev_read_block(int fd, void *buf, __u64 blk_addr)
{
return dev_read(fd, buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
}
int dev_read_blocks(int fd, void *buf, __u64 addr, __u32 nr_blks)
{
return dev_read(fd, buf, addr * F2FS_BLKSIZE, nr_blks * F2FS_BLKSIZE);
}
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