blob: 07b460d01334cd9c34da3caa70f1bf62043a34ef [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*/
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
#include "exfat.h"
static void __set_sb_dirty(struct super_block *sb)
{
struct exfat_sb_info *sbi = EXFAT_SB(sb);
sbi->s_dirt = 1;
}
static u8 name_buf[MAX_PATH_LENGTH * MAX_CHARSET_SIZE];
static u8 free_bit[] = {
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 0 ~ 19 */
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, /* 20 ~ 39 */
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 40 ~ 59 */
0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 60 ~ 79 */
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, /* 80 ~ 99 */
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, /* 100 ~ 119 */
0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 120 ~ 139 */
0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, /* 140 ~ 159 */
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, /* 160 ~ 179 */
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, /* 180 ~ 199 */
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, /* 200 ~ 219 */
0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, /* 220 ~ 239 */
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 /* 240 ~ 254 */
};
static u8 used_bit[] = {
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, /* 0 ~ 19 */
2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, /* 20 ~ 39 */
2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, /* 40 ~ 59 */
4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, /* 60 ~ 79 */
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, /* 80 ~ 99 */
3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, /* 100 ~ 119 */
4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, /* 120 ~ 139 */
3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, /* 140 ~ 159 */
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, /* 160 ~ 179 */
4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, /* 180 ~ 199 */
3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, /* 200 ~ 219 */
5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, /* 220 ~ 239 */
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 /* 240 ~ 255 */
};
#define BITMAP_LOC(v) ((v) >> 3)
#define BITMAP_SHIFT(v) ((v) & 0x07)
static inline s32 exfat_bitmap_test(u8 *bitmap, int i)
{
u8 data;
data = bitmap[BITMAP_LOC(i)];
if ((data >> BITMAP_SHIFT(i)) & 0x01)
return 1;
return 0;
}
static inline void exfat_bitmap_set(u8 *bitmap, int i)
{
bitmap[BITMAP_LOC(i)] |= (0x01 << BITMAP_SHIFT(i));
}
static inline void exfat_bitmap_clear(u8 *bitmap, int i)
{
bitmap[BITMAP_LOC(i)] &= ~(0x01 << BITMAP_SHIFT(i));
}
/*
* File System Management Functions
*/
void fs_set_vol_flags(struct super_block *sb, u32 new_flag)
{
struct pbr_sector_t *p_pbr;
struct bpbex_t *p_bpb;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_fs->vol_flag == new_flag)
return;
p_fs->vol_flag = new_flag;
if (!p_fs->pbr_bh) {
if (sector_read(sb, p_fs->PBR_sector,
&p_fs->pbr_bh, 1) != 0)
return;
}
p_pbr = (struct pbr_sector_t *)p_fs->pbr_bh->b_data;
p_bpb = (struct bpbex_t *)p_pbr->bpb;
SET16(p_bpb->vol_flags, (u16)new_flag);
/* XXX duyoung
* what can we do here? (cuz fs_set_vol_flags() is void)
*/
if ((new_flag == VOL_DIRTY) && (!buffer_dirty(p_fs->pbr_bh)))
sector_write(sb, p_fs->PBR_sector, p_fs->pbr_bh, 1);
else
sector_write(sb, p_fs->PBR_sector, p_fs->pbr_bh, 0);
}
void fs_error(struct super_block *sb)
{
struct exfat_mount_options *opts = &EXFAT_SB(sb)->options;
if (opts->errors == EXFAT_ERRORS_PANIC) {
panic("[EXFAT] Filesystem panic from previous error\n");
} else if ((opts->errors == EXFAT_ERRORS_RO) && !sb_rdonly(sb)) {
sb->s_flags |= SB_RDONLY;
pr_err("[EXFAT] Filesystem has been set read-only\n");
}
}
/*
* Cluster Management Functions
*/
static s32 clear_cluster(struct super_block *sb, u32 clu)
{
sector_t s, n;
s32 ret = 0;
struct buffer_head *tmp_bh = NULL;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
if (clu == CLUSTER_32(0)) { /* FAT16 root_dir */
s = p_fs->root_start_sector;
n = p_fs->data_start_sector;
} else {
s = START_SECTOR(clu);
n = s + p_fs->sectors_per_clu;
}
for (; s < n; s++) {
ret = sector_read(sb, s, &tmp_bh, 0);
if (ret != 0)
return ret;
memset((char *)tmp_bh->b_data, 0x0, p_bd->sector_size);
ret = sector_write(sb, s, tmp_bh, 0);
if (ret != 0)
break;
}
brelse(tmp_bh);
return ret;
}
static s32 set_alloc_bitmap(struct super_block *sb, u32 clu)
{
int i, b;
sector_t sector;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
i = clu >> (p_bd->sector_size_bits + 3);
b = clu & ((p_bd->sector_size << 3) - 1);
sector = START_SECTOR(p_fs->map_clu) + i;
exfat_bitmap_set((u8 *)p_fs->vol_amap[i]->b_data, b);
return sector_write(sb, sector, p_fs->vol_amap[i], 0);
}
static s32 clr_alloc_bitmap(struct super_block *sb, u32 clu)
{
int i, b;
sector_t sector;
#ifdef CONFIG_STAGING_EXFAT_DISCARD
struct exfat_sb_info *sbi = EXFAT_SB(sb);
struct exfat_mount_options *opts = &sbi->options;
int ret;
#endif /* CONFIG_STAGING_EXFAT_DISCARD */
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
i = clu >> (p_bd->sector_size_bits + 3);
b = clu & ((p_bd->sector_size << 3) - 1);
sector = START_SECTOR(p_fs->map_clu) + i;
exfat_bitmap_clear((u8 *)p_fs->vol_amap[i]->b_data, b);
#ifdef CONFIG_STAGING_EXFAT_DISCARD
if (opts->discard) {
ret = sb_issue_discard(sb, START_SECTOR(clu),
(1 << p_fs->sectors_per_clu_bits),
GFP_NOFS, 0);
if (ret == -EOPNOTSUPP) {
pr_warn("discard not supported by device, disabling");
opts->discard = 0;
} else {
return ret;
}
}
#endif /* CONFIG_STAGING_EXFAT_DISCARD */
return sector_write(sb, sector, p_fs->vol_amap[i], 0);
}
static u32 test_alloc_bitmap(struct super_block *sb, u32 clu)
{
int i, map_i, map_b;
u32 clu_base, clu_free;
u8 k, clu_mask;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
clu_base = (clu & ~(0x7)) + 2;
clu_mask = (1 << (clu - clu_base + 2)) - 1;
map_i = clu >> (p_bd->sector_size_bits + 3);
map_b = (clu >> 3) & p_bd->sector_size_mask;
for (i = 2; i < p_fs->num_clusters; i += 8) {
k = *(((u8 *)p_fs->vol_amap[map_i]->b_data) + map_b);
if (clu_mask > 0) {
k |= clu_mask;
clu_mask = 0;
}
if (k < 0xFF) {
clu_free = clu_base + free_bit[k];
if (clu_free < p_fs->num_clusters)
return clu_free;
}
clu_base += 8;
if (((++map_b) >= p_bd->sector_size) ||
(clu_base >= p_fs->num_clusters)) {
if ((++map_i) >= p_fs->map_sectors) {
clu_base = 2;
map_i = 0;
}
map_b = 0;
}
}
return CLUSTER_32(~0);
}
s32 exfat_alloc_cluster(struct super_block *sb, s32 num_alloc,
struct chain_t *p_chain)
{
s32 num_clusters = 0;
u32 hint_clu, new_clu, last_clu = CLUSTER_32(~0);
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
hint_clu = p_chain->dir;
if (hint_clu == CLUSTER_32(~0)) {
hint_clu = test_alloc_bitmap(sb, p_fs->clu_srch_ptr - 2);
if (hint_clu == CLUSTER_32(~0))
return 0;
} else if (hint_clu >= p_fs->num_clusters) {
hint_clu = 2;
p_chain->flags = 0x01;
}
__set_sb_dirty(sb);
p_chain->dir = CLUSTER_32(~0);
while ((new_clu = test_alloc_bitmap(sb, hint_clu - 2)) != CLUSTER_32(~0)) {
if (new_clu != hint_clu) {
if (p_chain->flags == 0x03) {
exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters);
p_chain->flags = 0x01;
}
}
if (set_alloc_bitmap(sb, new_clu - 2) != 0)
return -EIO;
num_clusters++;
if (p_chain->flags == 0x01) {
if (exfat_fat_write(sb, new_clu, CLUSTER_32(~0)) < 0)
return -EIO;
}
if (p_chain->dir == CLUSTER_32(~0)) {
p_chain->dir = new_clu;
} else {
if (p_chain->flags == 0x01) {
if (exfat_fat_write(sb, last_clu, new_clu) < 0)
return -EIO;
}
}
last_clu = new_clu;
if ((--num_alloc) == 0) {
p_fs->clu_srch_ptr = hint_clu;
if (p_fs->used_clusters != UINT_MAX)
p_fs->used_clusters += num_clusters;
p_chain->size += num_clusters;
return num_clusters;
}
hint_clu = new_clu + 1;
if (hint_clu >= p_fs->num_clusters) {
hint_clu = 2;
if (p_chain->flags == 0x03) {
exfat_chain_cont_cluster(sb, p_chain->dir,
num_clusters);
p_chain->flags = 0x01;
}
}
}
p_fs->clu_srch_ptr = hint_clu;
if (p_fs->used_clusters != UINT_MAX)
p_fs->used_clusters += num_clusters;
p_chain->size += num_clusters;
return num_clusters;
}
void exfat_free_cluster(struct super_block *sb, struct chain_t *p_chain,
s32 do_relse)
{
s32 num_clusters = 0;
u32 clu;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
int i;
sector_t sector;
if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0)))
return;
if (p_chain->size <= 0) {
pr_err("[EXFAT] free_cluster : skip free-req clu:%u, because of zero-size truncation\n",
p_chain->dir);
return;
}
__set_sb_dirty(sb);
clu = p_chain->dir;
if (p_chain->flags == 0x03) {
do {
if (do_relse) {
sector = START_SECTOR(clu);
for (i = 0; i < p_fs->sectors_per_clu; i++)
exfat_buf_release(sb, sector + i);
}
if (clr_alloc_bitmap(sb, clu - 2) != 0)
break;
clu++;
num_clusters++;
} while (num_clusters < p_chain->size);
} else {
do {
if (p_fs->dev_ejected)
break;
if (do_relse) {
sector = START_SECTOR(clu);
for (i = 0; i < p_fs->sectors_per_clu; i++)
exfat_buf_release(sb, sector + i);
}
if (clr_alloc_bitmap(sb, clu - 2) != 0)
break;
if (exfat_fat_read(sb, clu, &clu) == -1)
break;
num_clusters++;
} while ((clu != CLUSTER_32(0)) && (clu != CLUSTER_32(~0)));
}
if (p_fs->used_clusters != UINT_MAX)
p_fs->used_clusters -= num_clusters;
}
static u32 find_last_cluster(struct super_block *sb, struct chain_t *p_chain)
{
u32 clu, next;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
clu = p_chain->dir;
if (p_chain->flags == 0x03) {
clu += p_chain->size - 1;
} else {
while ((exfat_fat_read(sb, clu, &next) == 0) &&
(next != CLUSTER_32(~0))) {
if (p_fs->dev_ejected)
break;
clu = next;
}
}
return clu;
}
s32 count_num_clusters(struct super_block *sb, struct chain_t *p_chain)
{
int i, count = 0;
u32 clu;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if ((p_chain->dir == CLUSTER_32(0)) || (p_chain->dir == CLUSTER_32(~0)))
return 0;
clu = p_chain->dir;
if (p_chain->flags == 0x03) {
count = p_chain->size;
} else {
for (i = 2; i < p_fs->num_clusters; i++) {
count++;
if (exfat_fat_read(sb, clu, &clu) != 0)
return 0;
if (clu == CLUSTER_32(~0))
break;
}
}
return count;
}
s32 exfat_count_used_clusters(struct super_block *sb)
{
int i, map_i, map_b, count = 0;
u8 k;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
map_i = 0;
map_b = 0;
for (i = 2; i < p_fs->num_clusters; i += 8) {
k = *(((u8 *)p_fs->vol_amap[map_i]->b_data) + map_b);
count += used_bit[k];
if ((++map_b) >= p_bd->sector_size) {
map_i++;
map_b = 0;
}
}
return count;
}
void exfat_chain_cont_cluster(struct super_block *sb, u32 chain, s32 len)
{
if (len == 0)
return;
while (len > 1) {
if (exfat_fat_write(sb, chain, chain + 1) < 0)
break;
chain++;
len--;
}
exfat_fat_write(sb, chain, CLUSTER_32(~0));
}
/*
* Allocation Bitmap Management Functions
*/
s32 load_alloc_bitmap(struct super_block *sb)
{
int i, j, ret;
u32 map_size;
u32 type;
sector_t sector;
struct chain_t clu;
struct bmap_dentry_t *ep;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
clu.dir = p_fs->root_dir;
clu.flags = 0x01;
while (clu.dir != CLUSTER_32(~0)) {
if (p_fs->dev_ejected)
break;
for (i = 0; i < p_fs->dentries_per_clu; i++) {
ep = (struct bmap_dentry_t *)get_entry_in_dir(sb, &clu,
i, NULL);
if (!ep)
return -ENOENT;
type = exfat_get_entry_type((struct dentry_t *)ep);
if (type == TYPE_UNUSED)
break;
if (type != TYPE_BITMAP)
continue;
if (ep->flags == 0x0) {
p_fs->map_clu = GET32_A(ep->start_clu);
map_size = (u32)GET64_A(ep->size);
p_fs->map_sectors = ((map_size - 1) >> p_bd->sector_size_bits) + 1;
p_fs->vol_amap = kmalloc_array(p_fs->map_sectors,
sizeof(struct buffer_head *),
GFP_KERNEL);
if (!p_fs->vol_amap)
return -ENOMEM;
sector = START_SECTOR(p_fs->map_clu);
for (j = 0; j < p_fs->map_sectors; j++) {
p_fs->vol_amap[j] = NULL;
ret = sector_read(sb, sector + j, &p_fs->vol_amap[j], 1);
if (ret != 0) {
/* release all buffers and free vol_amap */
i = 0;
while (i < j)
brelse(p_fs->vol_amap[i++]);
kfree(p_fs->vol_amap);
p_fs->vol_amap = NULL;
return ret;
}
}
p_fs->pbr_bh = NULL;
return 0;
}
}
if (exfat_fat_read(sb, clu.dir, &clu.dir) != 0)
return -EIO;
}
return -EFSCORRUPTED;
}
void free_alloc_bitmap(struct super_block *sb)
{
int i;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
brelse(p_fs->pbr_bh);
for (i = 0; i < p_fs->map_sectors; i++)
__brelse(p_fs->vol_amap[i]);
kfree(p_fs->vol_amap);
p_fs->vol_amap = NULL;
}
void sync_alloc_bitmap(struct super_block *sb)
{
int i;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (!p_fs->vol_amap)
return;
for (i = 0; i < p_fs->map_sectors; i++)
sync_dirty_buffer(p_fs->vol_amap[i]);
}
/*
* Upcase table Management Functions
*/
static s32 __load_upcase_table(struct super_block *sb, sector_t sector,
u32 num_sectors, u32 utbl_checksum)
{
int i, ret = -EINVAL;
u32 j;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
struct buffer_head *tmp_bh = NULL;
sector_t end_sector = num_sectors + sector;
bool skip = false;
u32 index = 0;
u16 uni = 0;
u16 **upcase_table;
u32 checksum = 0;
upcase_table = kmalloc_array(UTBL_COL_COUNT, sizeof(u16 *), GFP_KERNEL);
p_fs->vol_utbl = upcase_table;
if (!upcase_table)
return -ENOMEM;
memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *));
while (sector < end_sector) {
ret = sector_read(sb, sector, &tmp_bh, 1);
if (ret != 0) {
pr_debug("sector read (0x%llX)fail\n",
(unsigned long long)sector);
goto error;
}
sector++;
for (i = 0; i < p_bd->sector_size && index <= 0xFFFF; i += 2) {
uni = GET16(((u8 *)tmp_bh->b_data) + i);
checksum = ((checksum & 1) ? 0x80000000 : 0) +
(checksum >> 1) + *(((u8 *)tmp_bh->b_data) +
i);
checksum = ((checksum & 1) ? 0x80000000 : 0) +
(checksum >> 1) + *(((u8 *)tmp_bh->b_data) +
(i + 1));
if (skip) {
pr_debug("skip from 0x%X ", index);
index += uni;
pr_debug("to 0x%X (amount of 0x%X)\n",
index, uni);
skip = false;
} else if (uni == index) {
index++;
} else if (uni == 0xFFFF) {
skip = true;
} else { /* uni != index , uni != 0xFFFF */
u16 col_index = get_col_index(index);
if (!upcase_table[col_index]) {
pr_debug("alloc = 0x%X\n", col_index);
upcase_table[col_index] = kmalloc_array(UTBL_ROW_COUNT,
sizeof(u16), GFP_KERNEL);
if (!upcase_table[col_index]) {
ret = -ENOMEM;
goto error;
}
for (j = 0; j < UTBL_ROW_COUNT; j++)
upcase_table[col_index][j] = (col_index << LOW_INDEX_BIT) | j;
}
upcase_table[col_index][get_row_index(index)] = uni;
index++;
}
}
}
if (index >= 0xFFFF && utbl_checksum == checksum) {
if (tmp_bh)
brelse(tmp_bh);
return 0;
}
ret = -EINVAL;
error:
if (tmp_bh)
brelse(tmp_bh);
free_upcase_table(sb);
return ret;
}
static s32 __load_default_upcase_table(struct super_block *sb)
{
int i, ret = -EINVAL;
u32 j;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
bool skip = false;
u32 index = 0;
u16 uni = 0;
u16 **upcase_table;
upcase_table = kmalloc_array(UTBL_COL_COUNT, sizeof(u16 *), GFP_KERNEL);
p_fs->vol_utbl = upcase_table;
if (!upcase_table)
return -ENOMEM;
memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *));
for (i = 0; index <= 0xFFFF && i < NUM_UPCASE * 2; i += 2) {
uni = GET16(uni_upcase + i);
if (skip) {
pr_debug("skip from 0x%X ", index);
index += uni;
pr_debug("to 0x%X (amount of 0x%X)\n", index, uni);
skip = false;
} else if (uni == index) {
index++;
} else if (uni == 0xFFFF) {
skip = true;
} else { /* uni != index , uni != 0xFFFF */
u16 col_index = get_col_index(index);
if (!upcase_table[col_index]) {
pr_debug("alloc = 0x%X\n", col_index);
upcase_table[col_index] = kmalloc_array(UTBL_ROW_COUNT,
sizeof(u16),
GFP_KERNEL);
if (!upcase_table[col_index]) {
ret = -ENOMEM;
goto error;
}
for (j = 0; j < UTBL_ROW_COUNT; j++)
upcase_table[col_index][j] = (col_index << LOW_INDEX_BIT) | j;
}
upcase_table[col_index][get_row_index(index)] = uni;
index++;
}
}
if (index >= 0xFFFF)
return 0;
error:
/* FATAL error: default upcase table has error */
free_upcase_table(sb);
return ret;
}
s32 load_upcase_table(struct super_block *sb)
{
int i;
u32 tbl_clu, tbl_size;
sector_t sector;
u32 type, num_sectors;
struct chain_t clu;
struct case_dentry_t *ep;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
clu.dir = p_fs->root_dir;
clu.flags = 0x01;
if (p_fs->dev_ejected)
return -EIO;
while (clu.dir != CLUSTER_32(~0)) {
for (i = 0; i < p_fs->dentries_per_clu; i++) {
ep = (struct case_dentry_t *)get_entry_in_dir(sb, &clu,
i, NULL);
if (!ep)
return -ENOENT;
type = exfat_get_entry_type((struct dentry_t *)ep);
if (type == TYPE_UNUSED)
break;
if (type != TYPE_UPCASE)
continue;
tbl_clu = GET32_A(ep->start_clu);
tbl_size = (u32)GET64_A(ep->size);
sector = START_SECTOR(tbl_clu);
num_sectors = ((tbl_size - 1) >> p_bd->sector_size_bits) + 1;
if (__load_upcase_table(sb, sector, num_sectors,
GET32_A(ep->checksum)) != 0)
break;
return 0;
}
if (exfat_fat_read(sb, clu.dir, &clu.dir) != 0)
return -EIO;
}
/* load default upcase table */
return __load_default_upcase_table(sb);
}
void free_upcase_table(struct super_block *sb)
{
u32 i;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
u16 **upcase_table;
upcase_table = p_fs->vol_utbl;
for (i = 0; i < UTBL_COL_COUNT; i++)
kfree(upcase_table[i]);
kfree(p_fs->vol_utbl);
p_fs->vol_utbl = NULL;
}
/*
* Directory Entry Management Functions
*/
u32 exfat_get_entry_type(struct dentry_t *p_entry)
{
struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
if (ep->type == 0x0) {
return TYPE_UNUSED;
} else if (ep->type < 0x80) {
return TYPE_DELETED;
} else if (ep->type == 0x80) {
return TYPE_INVALID;
} else if (ep->type < 0xA0) {
if (ep->type == 0x81) {
return TYPE_BITMAP;
} else if (ep->type == 0x82) {
return TYPE_UPCASE;
} else if (ep->type == 0x83) {
return TYPE_VOLUME;
} else if (ep->type == 0x85) {
if (GET16_A(ep->attr) & ATTR_SUBDIR)
return TYPE_DIR;
else
return TYPE_FILE;
}
return TYPE_CRITICAL_PRI;
} else if (ep->type < 0xC0) {
if (ep->type == 0xA0)
return TYPE_GUID;
else if (ep->type == 0xA1)
return TYPE_PADDING;
else if (ep->type == 0xA2)
return TYPE_ACLTAB;
return TYPE_BENIGN_PRI;
} else if (ep->type < 0xE0) {
if (ep->type == 0xC0)
return TYPE_STREAM;
else if (ep->type == 0xC1)
return TYPE_EXTEND;
else if (ep->type == 0xC2)
return TYPE_ACL;
return TYPE_CRITICAL_SEC;
}
return TYPE_BENIGN_SEC;
}
static void exfat_set_entry_type(struct dentry_t *p_entry, u32 type)
{
struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
if (type == TYPE_UNUSED) {
ep->type = 0x0;
} else if (type == TYPE_DELETED) {
ep->type &= ~0x80;
} else if (type == TYPE_STREAM) {
ep->type = 0xC0;
} else if (type == TYPE_EXTEND) {
ep->type = 0xC1;
} else if (type == TYPE_BITMAP) {
ep->type = 0x81;
} else if (type == TYPE_UPCASE) {
ep->type = 0x82;
} else if (type == TYPE_VOLUME) {
ep->type = 0x83;
} else if (type == TYPE_DIR) {
ep->type = 0x85;
SET16_A(ep->attr, ATTR_SUBDIR);
} else if (type == TYPE_FILE) {
ep->type = 0x85;
SET16_A(ep->attr, ATTR_ARCHIVE);
} else if (type == TYPE_SYMLINK) {
ep->type = 0x85;
SET16_A(ep->attr, ATTR_ARCHIVE | ATTR_SYMLINK);
}
}
u32 exfat_get_entry_attr(struct dentry_t *p_entry)
{
struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
return (u32)GET16_A(ep->attr);
}
void exfat_set_entry_attr(struct dentry_t *p_entry, u32 attr)
{
struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
SET16_A(ep->attr, (u16)attr);
}
u8 exfat_get_entry_flag(struct dentry_t *p_entry)
{
struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
return ep->flags;
}
void exfat_set_entry_flag(struct dentry_t *p_entry, u8 flags)
{
struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
ep->flags = flags;
}
u32 exfat_get_entry_clu0(struct dentry_t *p_entry)
{
struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
return GET32_A(ep->start_clu);
}
void exfat_set_entry_clu0(struct dentry_t *p_entry, u32 start_clu)
{
struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
SET32_A(ep->start_clu, start_clu);
}
u64 exfat_get_entry_size(struct dentry_t *p_entry)
{
struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
return GET64_A(ep->valid_size);
}
void exfat_set_entry_size(struct dentry_t *p_entry, u64 size)
{
struct strm_dentry_t *ep = (struct strm_dentry_t *)p_entry;
SET64_A(ep->valid_size, size);
SET64_A(ep->size, size);
}
void exfat_get_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
u8 mode)
{
u16 t = 0x00, d = 0x21;
struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
switch (mode) {
case TM_CREATE:
t = GET16_A(ep->create_time);
d = GET16_A(ep->create_date);
break;
case TM_MODIFY:
t = GET16_A(ep->modify_time);
d = GET16_A(ep->modify_date);
break;
case TM_ACCESS:
t = GET16_A(ep->access_time);
d = GET16_A(ep->access_date);
break;
}
tp->sec = (t & 0x001F) << 1;
tp->min = (t >> 5) & 0x003F;
tp->hour = (t >> 11);
tp->day = (d & 0x001F);
tp->mon = (d >> 5) & 0x000F;
tp->year = (d >> 9);
}
void exfat_set_entry_time(struct dentry_t *p_entry, struct timestamp_t *tp,
u8 mode)
{
u16 t, d;
struct file_dentry_t *ep = (struct file_dentry_t *)p_entry;
t = (tp->hour << 11) | (tp->min << 5) | (tp->sec >> 1);
d = (tp->year << 9) | (tp->mon << 5) | tp->day;
switch (mode) {
case TM_CREATE:
SET16_A(ep->create_time, t);
SET16_A(ep->create_date, d);
break;
case TM_MODIFY:
SET16_A(ep->modify_time, t);
SET16_A(ep->modify_date, d);
break;
case TM_ACCESS:
SET16_A(ep->access_time, t);
SET16_A(ep->access_date, d);
break;
}
}
static void init_file_entry(struct file_dentry_t *ep, u32 type)
{
struct timestamp_t tm, *tp;
exfat_set_entry_type((struct dentry_t *)ep, type);
tp = tm_current(&tm);
exfat_set_entry_time((struct dentry_t *)ep, tp, TM_CREATE);
exfat_set_entry_time((struct dentry_t *)ep, tp, TM_MODIFY);
exfat_set_entry_time((struct dentry_t *)ep, tp, TM_ACCESS);
ep->create_time_ms = 0;
ep->modify_time_ms = 0;
ep->access_time_ms = 0;
}
static void init_strm_entry(struct strm_dentry_t *ep, u8 flags, u32 start_clu, u64 size)
{
exfat_set_entry_type((struct dentry_t *)ep, TYPE_STREAM);
ep->flags = flags;
SET32_A(ep->start_clu, start_clu);
SET64_A(ep->valid_size, size);
SET64_A(ep->size, size);
}
static void init_name_entry(struct name_dentry_t *ep, u16 *uniname)
{
int i;
exfat_set_entry_type((struct dentry_t *)ep, TYPE_EXTEND);
ep->flags = 0x0;
for (i = 0; i < 30; i++, i++) {
SET16_A(ep->unicode_0_14 + i, *uniname);
if (*uniname == 0x0)
break;
uniname++;
}
}
static s32 exfat_init_dir_entry(struct super_block *sb, struct chain_t *p_dir,
s32 entry, u32 type, u32 start_clu, u64 size)
{
sector_t sector;
u8 flags;
struct file_dentry_t *file_ep;
struct strm_dentry_t *strm_ep;
flags = (type == TYPE_FILE) ? 0x01 : 0x03;
/* we cannot use get_entry_set_in_dir here because file ep is not initialized yet */
file_ep = (struct file_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
&sector);
if (!file_ep)
return -ENOENT;
strm_ep = (struct strm_dentry_t *)get_entry_in_dir(sb, p_dir, entry + 1,
&sector);
if (!strm_ep)
return -ENOENT;
init_file_entry(file_ep, type);
exfat_buf_modify(sb, sector);
init_strm_entry(strm_ep, flags, start_clu, size);
exfat_buf_modify(sb, sector);
return 0;
}
static s32 exfat_init_ext_entry(struct super_block *sb, struct chain_t *p_dir,
s32 entry, s32 num_entries,
struct uni_name_t *p_uniname,
struct dos_name_t *p_dosname)
{
int i;
sector_t sector;
u16 *uniname = p_uniname->name;
struct file_dentry_t *file_ep;
struct strm_dentry_t *strm_ep;
struct name_dentry_t *name_ep;
file_ep = (struct file_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
&sector);
if (!file_ep)
return -ENOENT;
file_ep->num_ext = (u8)(num_entries - 1);
exfat_buf_modify(sb, sector);
strm_ep = (struct strm_dentry_t *)get_entry_in_dir(sb, p_dir, entry + 1,
&sector);
if (!strm_ep)
return -ENOENT;
strm_ep->name_len = p_uniname->name_len;
SET16_A(strm_ep->name_hash, p_uniname->name_hash);
exfat_buf_modify(sb, sector);
for (i = 2; i < num_entries; i++) {
name_ep = (struct name_dentry_t *)get_entry_in_dir(sb, p_dir,
entry + i,
&sector);
if (!name_ep)
return -ENOENT;
init_name_entry(name_ep, uniname);
exfat_buf_modify(sb, sector);
uniname += 15;
}
update_dir_checksum(sb, p_dir, entry);
return 0;
}
void exfat_delete_dir_entry(struct super_block *sb, struct chain_t *p_dir,
s32 entry, s32 order, s32 num_entries)
{
int i;
sector_t sector;
struct dentry_t *ep;
for (i = order; i < num_entries; i++) {
ep = get_entry_in_dir(sb, p_dir, entry + i, &sector);
if (!ep)
return;
exfat_set_entry_type(ep, TYPE_DELETED);
exfat_buf_modify(sb, sector);
}
}
void update_dir_checksum(struct super_block *sb, struct chain_t *p_dir,
s32 entry)
{
int i, num_entries;
sector_t sector;
u16 chksum;
struct file_dentry_t *file_ep;
struct dentry_t *ep;
file_ep = (struct file_dentry_t *)get_entry_in_dir(sb, p_dir, entry,
&sector);
if (!file_ep)
return;
exfat_buf_lock(sb, sector);
num_entries = (s32)file_ep->num_ext + 1;
chksum = calc_checksum_2byte((void *)file_ep, DENTRY_SIZE, 0,
CS_DIR_ENTRY);
for (i = 1; i < num_entries; i++) {
ep = get_entry_in_dir(sb, p_dir, entry + i, NULL);
if (!ep) {
exfat_buf_unlock(sb, sector);
return;
}
chksum = calc_checksum_2byte((void *)ep, DENTRY_SIZE, chksum,
CS_DEFAULT);
}
SET16_A(file_ep->checksum, chksum);
exfat_buf_modify(sb, sector);
exfat_buf_unlock(sb, sector);
}
static s32 __write_partial_entries_in_entry_set(struct super_block *sb,
struct entry_set_cache_t *es,
sector_t sec, s32 off, u32 count)
{
s32 num_entries, buf_off = (off - es->offset);
u32 remaining_byte_in_sector, copy_entries;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
u32 clu;
u8 *buf, *esbuf = (u8 *)&es->__buf;
pr_debug("%s entered es %p sec %llu off %d count %d\n",
__func__, es, (unsigned long long)sec, off, count);
num_entries = count;
while (num_entries) {
/* white per sector base */
remaining_byte_in_sector = (1 << p_bd->sector_size_bits) - off;
copy_entries = min_t(s32,
remaining_byte_in_sector >> DENTRY_SIZE_BITS,
num_entries);
buf = exfat_buf_getblk(sb, sec);
if (!buf)
goto err_out;
pr_debug("es->buf %p buf_off %u\n", esbuf, buf_off);
pr_debug("copying %d entries from %p to sector %llu\n",
copy_entries, (esbuf + buf_off),
(unsigned long long)sec);
memcpy(buf + off, esbuf + buf_off,
copy_entries << DENTRY_SIZE_BITS);
exfat_buf_modify(sb, sec);
num_entries -= copy_entries;
if (num_entries) {
/* get next sector */
if (IS_LAST_SECTOR_IN_CLUSTER(sec)) {
clu = GET_CLUSTER_FROM_SECTOR(sec);
if (es->alloc_flag == 0x03) {
clu++;
} else {
if (exfat_fat_read(sb, clu, &clu) == -1)
goto err_out;
}
sec = START_SECTOR(clu);
} else {
sec++;
}
off = 0;
buf_off += copy_entries << DENTRY_SIZE_BITS;
}
}
pr_debug("%s exited successfully\n", __func__);
return 0;
err_out:
pr_debug("%s failed\n", __func__);
return -EINVAL;
}
/* write back all entries in entry set */
static s32 write_whole_entry_set(struct super_block *sb, struct entry_set_cache_t *es)
{
return __write_partial_entries_in_entry_set(sb, es, es->sector,
es->offset,
es->num_entries);
}
void update_dir_checksum_with_entry_set(struct super_block *sb,
struct entry_set_cache_t *es)
{
struct dentry_t *ep;
u16 chksum = 0;
s32 chksum_type = CS_DIR_ENTRY, i;
ep = (struct dentry_t *)&es->__buf;
for (i = 0; i < es->num_entries; i++) {
pr_debug("%s ep %p\n", __func__, ep);
chksum = calc_checksum_2byte((void *)ep, DENTRY_SIZE, chksum,
chksum_type);
ep++;
chksum_type = CS_DEFAULT;
}
ep = (struct dentry_t *)&es->__buf;
SET16_A(((struct file_dentry_t *)ep)->checksum, chksum);
write_whole_entry_set(sb, es);
}
static s32 _walk_fat_chain(struct super_block *sb, struct chain_t *p_dir,
s32 byte_offset, u32 *clu)
{
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
s32 clu_offset;
u32 cur_clu;
clu_offset = byte_offset >> p_fs->cluster_size_bits;
cur_clu = p_dir->dir;
if (p_dir->flags == 0x03) {
cur_clu += clu_offset;
} else {
while (clu_offset > 0) {
if (exfat_fat_read(sb, cur_clu, &cur_clu) == -1)
return -EIO;
clu_offset--;
}
}
if (clu)
*clu = cur_clu;
return 0;
}
static s32 find_location(struct super_block *sb, struct chain_t *p_dir, s32 entry,
sector_t *sector, s32 *offset)
{
s32 off, ret;
u32 clu = 0;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
off = entry << DENTRY_SIZE_BITS;
if (p_dir->dir == CLUSTER_32(0)) { /* FAT16 root_dir */
*offset = off & p_bd->sector_size_mask;
*sector = off >> p_bd->sector_size_bits;
*sector += p_fs->root_start_sector;
} else {
ret = _walk_fat_chain(sb, p_dir, off, &clu);
if (ret != 0)
return ret;
/* byte offset in cluster */
off &= p_fs->cluster_size - 1;
/* byte offset in sector */
*offset = off & p_bd->sector_size_mask;
/* sector offset in cluster */
*sector = off >> p_bd->sector_size_bits;
*sector += START_SECTOR(clu);
}
return 0;
}
struct dentry_t *get_entry_in_dir(struct super_block *sb, struct chain_t *p_dir,
s32 entry, sector_t *sector)
{
s32 off;
sector_t sec;
u8 *buf;
if (find_location(sb, p_dir, entry, &sec, &off) != 0)
return NULL;
buf = exfat_buf_getblk(sb, sec);
if (!buf)
return NULL;
if (sector)
*sector = sec;
return (struct dentry_t *)(buf + off);
}
/* returns a set of dentries for a file or dir.
* Note that this is a copy (dump) of dentries so that user should call write_entry_set()
* to apply changes made in this entry set to the real device.
* in:
* sb+p_dir+entry: indicates a file/dir
* type: specifies how many dentries should be included.
* out:
* file_ep: will point the first dentry(= file dentry) on success
* return:
* pointer of entry set on success,
* NULL on failure.
*/
#define ES_MODE_STARTED 0
#define ES_MODE_GET_FILE_ENTRY 1
#define ES_MODE_GET_STRM_ENTRY 2
#define ES_MODE_GET_NAME_ENTRY 3
#define ES_MODE_GET_CRITICAL_SEC_ENTRY 4
struct entry_set_cache_t *get_entry_set_in_dir(struct super_block *sb,
struct chain_t *p_dir, s32 entry,
u32 type,
struct dentry_t **file_ep)
{
s32 off, ret, byte_offset;
u32 clu = 0;
sector_t sec;
u32 entry_type;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
struct entry_set_cache_t *es = NULL;
struct dentry_t *ep, *pos;
u8 *buf;
u8 num_entries;
s32 mode = ES_MODE_STARTED;
size_t bufsize;
pr_debug("%s entered p_dir dir %u flags %x size %d\n",
__func__, p_dir->dir, p_dir->flags, p_dir->size);
byte_offset = entry << DENTRY_SIZE_BITS;
ret = _walk_fat_chain(sb, p_dir, byte_offset, &clu);
if (ret != 0)
return NULL;
/* byte offset in cluster */
byte_offset &= p_fs->cluster_size - 1;
/* byte offset in sector */
off = byte_offset & p_bd->sector_size_mask;
/* sector offset in cluster */
sec = byte_offset >> p_bd->sector_size_bits;
sec += START_SECTOR(clu);
buf = exfat_buf_getblk(sb, sec);
if (!buf)
goto err_out;
ep = (struct dentry_t *)(buf + off);
entry_type = exfat_get_entry_type(ep);
if ((entry_type != TYPE_FILE) && (entry_type != TYPE_DIR))
goto err_out;
if (type == ES_ALL_ENTRIES)
num_entries = ((struct file_dentry_t *)ep)->num_ext + 1;
else
num_entries = type;
bufsize = offsetof(struct entry_set_cache_t, __buf) + (num_entries) *
sizeof(struct dentry_t);
pr_debug("%s: trying to kmalloc %zx bytes for %d entries\n", __func__,
bufsize, num_entries);
es = kmalloc(bufsize, GFP_KERNEL);
if (!es)
goto err_out;
es->num_entries = num_entries;
es->sector = sec;
es->offset = off;
es->alloc_flag = p_dir->flags;
pos = (struct dentry_t *)&es->__buf;
while (num_entries) {
/*
* instead of copying whole sector, we will check every entry.
* this will provide minimum stablity and consistency.
*/
entry_type = exfat_get_entry_type(ep);
if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED))
goto err_out;
switch (mode) {
case ES_MODE_STARTED:
if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR))
mode = ES_MODE_GET_FILE_ENTRY;
else
goto err_out;
break;
case ES_MODE_GET_FILE_ENTRY:
if (entry_type == TYPE_STREAM)
mode = ES_MODE_GET_STRM_ENTRY;
else
goto err_out;
break;
case ES_MODE_GET_STRM_ENTRY:
if (entry_type == TYPE_EXTEND)
mode = ES_MODE_GET_NAME_ENTRY;
else
goto err_out;
break;
case ES_MODE_GET_NAME_ENTRY:
if (entry_type == TYPE_EXTEND)
break;
else if (entry_type == TYPE_STREAM)
goto err_out;
else if (entry_type & TYPE_CRITICAL_SEC)
mode = ES_MODE_GET_CRITICAL_SEC_ENTRY;
else
goto err_out;
break;
case ES_MODE_GET_CRITICAL_SEC_ENTRY:
if ((entry_type == TYPE_EXTEND) ||
(entry_type == TYPE_STREAM))
goto err_out;
else if ((entry_type & TYPE_CRITICAL_SEC) !=
TYPE_CRITICAL_SEC)
goto err_out;
break;
}
memcpy(pos, ep, sizeof(struct dentry_t));
if (--num_entries == 0)
break;
if (((off + DENTRY_SIZE) & p_bd->sector_size_mask) <
(off & p_bd->sector_size_mask)) {
/* get the next sector */
if (IS_LAST_SECTOR_IN_CLUSTER(sec)) {
if (es->alloc_flag == 0x03) {
clu++;
} else {
if (exfat_fat_read(sb, clu, &clu) == -1)
goto err_out;
}
sec = START_SECTOR(clu);
} else {
sec++;
}
buf = exfat_buf_getblk(sb, sec);
if (!buf)
goto err_out;
off = 0;
ep = (struct dentry_t *)(buf);
} else {
ep++;
off += DENTRY_SIZE;
}
pos++;
}
if (file_ep)
*file_ep = (struct dentry_t *)&es->__buf;
pr_debug("%s exiting es %p sec %llu offset %d flags %d, num_entries %u buf ptr %p\n",
__func__, es, (unsigned long long)es->sector, es->offset,
es->alloc_flag, es->num_entries, &es->__buf);
return es;
err_out:
pr_debug("%s exited NULL (es %p)\n", __func__, es);
kfree(es);
return NULL;
}
void release_entry_set(struct entry_set_cache_t *es)
{
pr_debug("%s es=%p\n", __func__, es);
kfree(es);
}
/* search EMPTY CONTINUOUS "num_entries" entries */
static s32 search_deleted_or_unused_entry(struct super_block *sb,
struct chain_t *p_dir,
s32 num_entries)
{
int i, dentry, num_empty = 0;
s32 dentries_per_clu;
u32 type;
struct chain_t clu;
struct dentry_t *ep;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
dentries_per_clu = p_fs->dentries_in_root;
else
dentries_per_clu = p_fs->dentries_per_clu;
if (p_fs->hint_uentry.dir == p_dir->dir) {
if (p_fs->hint_uentry.entry == -1)
return -1;
clu.dir = p_fs->hint_uentry.clu.dir;
clu.size = p_fs->hint_uentry.clu.size;
clu.flags = p_fs->hint_uentry.clu.flags;
dentry = p_fs->hint_uentry.entry;
} else {
p_fs->hint_uentry.entry = -1;
clu.dir = p_dir->dir;
clu.size = p_dir->size;
clu.flags = p_dir->flags;
dentry = 0;
}
while (clu.dir != CLUSTER_32(~0)) {
if (p_fs->dev_ejected)
break;
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
i = dentry % dentries_per_clu;
else
i = dentry & (dentries_per_clu - 1);
for (; i < dentries_per_clu; i++, dentry++) {
ep = get_entry_in_dir(sb, &clu, i, NULL);
if (!ep)
return -1;
type = exfat_get_entry_type(ep);
if (type == TYPE_UNUSED) {
num_empty++;
if (p_fs->hint_uentry.entry == -1) {
p_fs->hint_uentry.dir = p_dir->dir;
p_fs->hint_uentry.entry = dentry;
p_fs->hint_uentry.clu.dir = clu.dir;
p_fs->hint_uentry.clu.size = clu.size;
p_fs->hint_uentry.clu.flags = clu.flags;
}
} else if (type == TYPE_DELETED) {
num_empty++;
} else {
num_empty = 0;
}
if (num_empty >= num_entries) {
p_fs->hint_uentry.dir = CLUSTER_32(~0);
p_fs->hint_uentry.entry = -1;
if (p_fs->vol_type == EXFAT)
return dentry - (num_entries - 1);
else
return dentry;
}
}
if (p_dir->dir == CLUSTER_32(0))
break; /* FAT16 root_dir */
if (clu.flags == 0x03) {
if ((--clu.size) > 0)
clu.dir++;
else
clu.dir = CLUSTER_32(~0);
} else {
if (exfat_fat_read(sb, clu.dir, &clu.dir) != 0)
return -1;
}
}
return -1;
}
static s32 find_empty_entry(struct inode *inode, struct chain_t *p_dir, s32 num_entries)
{
s32 ret, dentry;
u32 last_clu;
sector_t sector;
u64 size = 0;
struct chain_t clu;
struct dentry_t *ep = NULL;
struct super_block *sb = inode->i_sb;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct file_id_t *fid = &(EXFAT_I(inode)->fid);
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
return search_deleted_or_unused_entry(sb, p_dir, num_entries);
while ((dentry = search_deleted_or_unused_entry(sb, p_dir, num_entries)) < 0) {
if (p_fs->dev_ejected)
break;
if (p_dir->dir != p_fs->root_dir)
size = i_size_read(inode);
last_clu = find_last_cluster(sb, p_dir);
clu.dir = last_clu + 1;
clu.size = 0;
clu.flags = p_dir->flags;
/* (1) allocate a cluster */
ret = exfat_alloc_cluster(sb, 1, &clu);
if (ret < 1)
return -EIO;
if (clear_cluster(sb, clu.dir) != 0)
return -EIO;
/* (2) append to the FAT chain */
if (clu.flags != p_dir->flags) {
exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
p_dir->flags = 0x01;
p_fs->hint_uentry.clu.flags = 0x01;
}
if (clu.flags == 0x01)
if (exfat_fat_write(sb, last_clu, clu.dir) < 0)
return -EIO;
if (p_fs->hint_uentry.entry == -1) {
p_fs->hint_uentry.dir = p_dir->dir;
p_fs->hint_uentry.entry = p_dir->size << (p_fs->cluster_size_bits - DENTRY_SIZE_BITS);
p_fs->hint_uentry.clu.dir = clu.dir;
p_fs->hint_uentry.clu.size = 0;
p_fs->hint_uentry.clu.flags = clu.flags;
}
p_fs->hint_uentry.clu.size++;
p_dir->size++;
/* (3) update the directory entry */
if (p_dir->dir != p_fs->root_dir) {
size += p_fs->cluster_size;
ep = get_entry_in_dir(sb, &fid->dir,
fid->entry + 1, &sector);
if (!ep)
return -ENOENT;
exfat_set_entry_size(ep, size);
exfat_set_entry_flag(ep, p_dir->flags);
exfat_buf_modify(sb, sector);
update_dir_checksum(sb, &fid->dir,
fid->entry);
}
i_size_write(inode, i_size_read(inode) + p_fs->cluster_size);
EXFAT_I(inode)->mmu_private += p_fs->cluster_size;
EXFAT_I(inode)->fid.size += p_fs->cluster_size;
EXFAT_I(inode)->fid.flags = p_dir->flags;
inode->i_blocks += 1 << (p_fs->cluster_size_bits - 9);
}
return dentry;
}
static s32 extract_uni_name_from_name_entry(struct name_dentry_t *ep, u16 *uniname,
s32 order)
{
int i, len = 0;
for (i = 0; i < 30; i += 2) {
*uniname = GET16_A(ep->unicode_0_14 + i);
if (*uniname == 0x0)
return len;
uniname++;
len++;
}
*uniname = 0x0;
return len;
}
/* return values of exfat_find_dir_entry()
* >= 0 : return dir entiry position with the name in dir
* -1 : (root dir, ".") it is the root dir itself
* -2 : entry with the name does not exist
*/
s32 exfat_find_dir_entry(struct super_block *sb, struct chain_t *p_dir,
struct uni_name_t *p_uniname, s32 num_entries,
struct dos_name_t *p_dosname, u32 type)
{
int i = 0, dentry = 0, num_ext_entries = 0, len, step;
s32 order = 0;
bool is_feasible_entry = false;
s32 dentries_per_clu, num_empty = 0;
u32 entry_type;
u16 entry_uniname[16], *uniname = NULL, unichar;
struct chain_t clu;
struct dentry_t *ep;
struct file_dentry_t *file_ep;
struct strm_dentry_t *strm_ep;
struct name_dentry_t *name_ep;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_dir->dir == p_fs->root_dir) {
if ((!nls_uniname_cmp(sb, p_uniname->name,
(u16 *)UNI_CUR_DIR_NAME)) ||
(!nls_uniname_cmp(sb, p_uniname->name,
(u16 *)UNI_PAR_DIR_NAME)))
return -1; // special case, root directory itself
}
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
dentries_per_clu = p_fs->dentries_in_root;
else
dentries_per_clu = p_fs->dentries_per_clu;
clu.dir = p_dir->dir;
clu.size = p_dir->size;
clu.flags = p_dir->flags;
p_fs->hint_uentry.dir = p_dir->dir;
p_fs->hint_uentry.entry = -1;
while (clu.dir != CLUSTER_32(~0)) {
if (p_fs->dev_ejected)
break;
while (i < dentries_per_clu) {
ep = get_entry_in_dir(sb, &clu, i, NULL);
if (!ep)
return -2;
entry_type = exfat_get_entry_type(ep);
step = 1;
if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED)) {
is_feasible_entry = false;
if (p_fs->hint_uentry.entry == -1) {
num_empty++;
if (num_empty == 1) {
p_fs->hint_uentry.clu.dir = clu.dir;
p_fs->hint_uentry.clu.size = clu.size;
p_fs->hint_uentry.clu.flags = clu.flags;
}
if ((num_empty >= num_entries) || (entry_type == TYPE_UNUSED))
p_fs->hint_uentry.entry = dentry - (num_empty - 1);
}
if (entry_type == TYPE_UNUSED)
return -2;
} else {
num_empty = 0;
if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) {
file_ep = (struct file_dentry_t *)ep;
if ((type == TYPE_ALL) || (type == entry_type)) {
num_ext_entries = file_ep->num_ext;
is_feasible_entry = true;
} else {
is_feasible_entry = false;
step = file_ep->num_ext + 1;
}
} else if (entry_type == TYPE_STREAM) {
if (is_feasible_entry) {
strm_ep = (struct strm_dentry_t *)ep;
if (p_uniname->name_hash == GET16_A(strm_ep->name_hash) &&
p_uniname->name_len == strm_ep->name_len) {
order = 1;
} else {
is_feasible_entry = false;
step = num_ext_entries;
}
}
} else if (entry_type == TYPE_EXTEND) {
if (is_feasible_entry) {
name_ep = (struct name_dentry_t *)ep;
if ((++order) == 2)
uniname = p_uniname->name;
else
uniname += 15;
len = extract_uni_name_from_name_entry(name_ep,
entry_uniname, order);
unichar = *(uniname + len);
*(uniname + len) = 0x0;
if (nls_uniname_cmp(sb, uniname, entry_uniname)) {
is_feasible_entry = false;
step = num_ext_entries - order + 1;
} else if (order == num_ext_entries) {
p_fs->hint_uentry.dir = CLUSTER_32(~0);
p_fs->hint_uentry.entry = -1;
return dentry - (num_ext_entries);
}
*(uniname + len) = unichar;
}
} else {
is_feasible_entry = false;
}
}
i += step;
dentry += step;
}
i -= dentries_per_clu;
if (p_dir->dir == CLUSTER_32(0))
break; /* FAT16 root_dir */
if (clu.flags == 0x03) {
if ((--clu.size) > 0)
clu.dir++;
else
clu.dir = CLUSTER_32(~0);
} else {
if (exfat_fat_read(sb, clu.dir, &clu.dir) != 0)
return -2;
}
}
return -2;
}
s32 exfat_count_ext_entries(struct super_block *sb, struct chain_t *p_dir,
s32 entry, struct dentry_t *p_entry)
{
int i, count = 0;
u32 type;
struct file_dentry_t *file_ep = (struct file_dentry_t *)p_entry;
struct dentry_t *ext_ep;
for (i = 0, entry++; i < file_ep->num_ext; i++, entry++) {
ext_ep = get_entry_in_dir(sb, p_dir, entry, NULL);
if (!ext_ep)
return -1;
type = exfat_get_entry_type(ext_ep);
if ((type == TYPE_EXTEND) || (type == TYPE_STREAM))
count++;
else
return count;
}
return count;
}
s32 count_dos_name_entries(struct super_block *sb, struct chain_t *p_dir,
u32 type)
{
int i, count = 0;
s32 dentries_per_clu;
u32 entry_type;
struct chain_t clu;
struct dentry_t *ep;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
dentries_per_clu = p_fs->dentries_in_root;
else
dentries_per_clu = p_fs->dentries_per_clu;
clu.dir = p_dir->dir;
clu.size = p_dir->size;
clu.flags = p_dir->flags;
while (clu.dir != CLUSTER_32(~0)) {
if (p_fs->dev_ejected)
break;
for (i = 0; i < dentries_per_clu; i++) {
ep = get_entry_in_dir(sb, &clu, i, NULL);
if (!ep)
return -ENOENT;
entry_type = exfat_get_entry_type(ep);
if (entry_type == TYPE_UNUSED)
return count;
if (!(type & TYPE_CRITICAL_PRI) &&
!(type & TYPE_BENIGN_PRI))
continue;
if ((type == TYPE_ALL) || (type == entry_type))
count++;
}
if (p_dir->dir == CLUSTER_32(0))
break; /* FAT16 root_dir */
if (clu.flags == 0x03) {
if ((--clu.size) > 0)
clu.dir++;
else
clu.dir = CLUSTER_32(~0);
} else {
if (exfat_fat_read(sb, clu.dir, &clu.dir) != 0)
return -EIO;
}
}
return count;
}
bool is_dir_empty(struct super_block *sb, struct chain_t *p_dir)
{
int i, count = 0;
s32 dentries_per_clu;
u32 type;
struct chain_t clu;
struct dentry_t *ep;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
dentries_per_clu = p_fs->dentries_in_root;
else
dentries_per_clu = p_fs->dentries_per_clu;
clu.dir = p_dir->dir;
clu.size = p_dir->size;
clu.flags = p_dir->flags;
while (clu.dir != CLUSTER_32(~0)) {
if (p_fs->dev_ejected)
break;
for (i = 0; i < dentries_per_clu; i++) {
ep = get_entry_in_dir(sb, &clu, i, NULL);
if (!ep)
break;
type = exfat_get_entry_type(ep);
if (type == TYPE_UNUSED)
return true;
if ((type != TYPE_FILE) && (type != TYPE_DIR))
continue;
if (p_dir->dir == CLUSTER_32(0)) /* FAT16 root_dir */
return false;
if (p_fs->vol_type == EXFAT)
return false;
if ((p_dir->dir == p_fs->root_dir) || ((++count) > 2))
return false;
}
if (p_dir->dir == CLUSTER_32(0))
break; /* FAT16 root_dir */
if (clu.flags == 0x03) {
if ((--clu.size) > 0)
clu.dir++;
else
clu.dir = CLUSTER_32(~0);
}
if (exfat_fat_read(sb, clu.dir, &clu.dir) != 0)
break;
}
return true;
}
/*
* Name Conversion Functions
*/
/* input : dir, uni_name
* output : num_of_entry, dos_name(format : aaaaaa~1.bbb)
*/
s32 get_num_entries_and_dos_name(struct super_block *sb, struct chain_t *p_dir,
struct uni_name_t *p_uniname, s32 *entries,
struct dos_name_t *p_dosname)
{
s32 num_entries;
num_entries = exfat_calc_num_entries(p_uniname);
if (num_entries == 0)
return -EINVAL;
*entries = num_entries;
return 0;
}
void exfat_get_uni_name_from_ext_entry(struct super_block *sb,
struct chain_t *p_dir, s32 entry,
u16 *uniname)
{
int i;
struct dentry_t *ep;
struct entry_set_cache_t *es;
es = get_entry_set_in_dir(sb, p_dir, entry, ES_ALL_ENTRIES, &ep);
if (!es || es->num_entries < 3) {
if (es)
release_entry_set(es);
return;
}
ep += 2;
/*
* First entry : file entry
* Second entry : stream-extension entry
* Third entry : first file-name entry
* So, the index of first file-name dentry should start from 2.
*/
for (i = 2; i < es->num_entries; i++, ep++) {
if (exfat_get_entry_type(ep) == TYPE_EXTEND)
extract_uni_name_from_name_entry((struct name_dentry_t *)
ep, uniname, i);
else
goto out;
uniname += 15;
}
out:
release_entry_set(es);
}
s32 exfat_calc_num_entries(struct uni_name_t *p_uniname)
{
s32 len;
len = p_uniname->name_len;
if (len == 0)
return 0;
/* 1 file entry + 1 stream entry + name entries */
return (len - 1) / 15 + 3;
}
u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type)
{
int i;
u8 *c = (u8 *)data;
switch (type) {
case CS_DIR_ENTRY:
for (i = 0; i < len; i++, c++) {
if ((i == 2) || (i == 3))
continue;
chksum = (((chksum & 1) << 15) |
((chksum & 0xFFFE) >> 1)) + (u16)*c;
}
break;
default
:
for (i = 0; i < len; i++, c++)
chksum = (((chksum & 1) << 15) |
((chksum & 0xFFFE) >> 1)) + (u16)*c;
}
return chksum;
}
/*
* Name Resolution Functions
*/
/* return values of resolve_path()
* > 0 : return the length of the path
* < 0 : return error
*/
s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
struct uni_name_t *p_uniname)
{
bool lossy = false;
struct super_block *sb = inode->i_sb;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct file_id_t *fid = &(EXFAT_I(inode)->fid);
if (strscpy(name_buf, path, sizeof(name_buf)) < 0)
return -EINVAL;
nls_cstring_to_uniname(sb, p_uniname, name_buf, &lossy);
if (lossy)
return -EINVAL;
fid->size = i_size_read(inode);
p_dir->dir = fid->start_clu;
p_dir->size = (s32)(fid->size >> p_fs->cluster_size_bits);
p_dir->flags = fid->flags;
return 0;
}
s32 exfat_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
{
struct bpbex_t *p_bpb = (struct bpbex_t *)p_pbr->bpb;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
if (p_bpb->num_fats == 0)
return -EFSCORRUPTED;
p_fs->sectors_per_clu = 1 << p_bpb->sectors_per_clu_bits;
p_fs->sectors_per_clu_bits = p_bpb->sectors_per_clu_bits;
p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits +
p_bd->sector_size_bits;
p_fs->cluster_size = 1 << p_fs->cluster_size_bits;
p_fs->num_FAT_sectors = GET32(p_bpb->fat_length);
p_fs->FAT1_start_sector = p_fs->PBR_sector + GET32(p_bpb->fat_offset);
if (p_bpb->num_fats == 1)
p_fs->FAT2_start_sector = p_fs->FAT1_start_sector;
else
p_fs->FAT2_start_sector = p_fs->FAT1_start_sector +
p_fs->num_FAT_sectors;
p_fs->root_start_sector = p_fs->PBR_sector + GET32(p_bpb->clu_offset);
p_fs->data_start_sector = p_fs->root_start_sector;
p_fs->num_sectors = GET64(p_bpb->vol_length);
p_fs->num_clusters = GET32(p_bpb->clu_count) + 2;
/* because the cluster index starts with 2 */
p_fs->vol_type = EXFAT;
p_fs->vol_id = GET32(p_bpb->vol_serial);
p_fs->root_dir = GET32(p_bpb->root_cluster);
p_fs->dentries_in_root = 0;
p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits -
DENTRY_SIZE_BITS);
p_fs->vol_flag = (u32)GET16(p_bpb->vol_flags);
p_fs->clu_srch_ptr = 2;
p_fs->used_clusters = UINT_MAX;
return 0;
}
s32 create_dir(struct inode *inode, struct chain_t *p_dir,
struct uni_name_t *p_uniname, struct file_id_t *fid)
{
s32 ret, dentry, num_entries;
u64 size;
struct chain_t clu;
struct dos_name_t dos_name;
struct super_block *sb = inode->i_sb;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
&dos_name);
if (ret)
return ret;
/* find_empty_entry must be called before alloc_cluster */
dentry = find_empty_entry(inode, p_dir, num_entries);
if (dentry < 0)
return -ENOSPC;
clu.dir = CLUSTER_32(~0);
clu.size = 0;
clu.flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
/* (1) allocate a cluster */
ret = exfat_alloc_cluster(sb, 1, &clu);
if (ret < 0)
return ret;
else if (ret == 0)
return -ENOSPC;
ret = clear_cluster(sb, clu.dir);
if (ret != 0)
return ret;
size = p_fs->cluster_size;
/* (2) update the directory entry */
/* make sub-dir entry in parent directory */
ret = exfat_init_dir_entry(sb, p_dir, dentry, TYPE_DIR, clu.dir,
size);
if (ret != 0)
return ret;
ret = exfat_init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname,
&dos_name);
if (ret != 0)
return ret;
fid->dir.dir = p_dir->dir;
fid->dir.size = p_dir->size;
fid->dir.flags = p_dir->flags;
fid->entry = dentry;
fid->attr = ATTR_SUBDIR;
fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
fid->size = size;
fid->start_clu = clu.dir;
fid->type = TYPE_DIR;
fid->rwoffset = 0;
fid->hint_last_off = -1;
return 0;
}
s32 create_file(struct inode *inode, struct chain_t *p_dir,
struct uni_name_t *p_uniname, u8 mode, struct file_id_t *fid)
{
s32 ret, dentry, num_entries;
struct dos_name_t dos_name;
struct super_block *sb = inode->i_sb;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname, &num_entries,
&dos_name);
if (ret)
return ret;
/* find_empty_entry must be called before alloc_cluster() */
dentry = find_empty_entry(inode, p_dir, num_entries);
if (dentry < 0)
return -ENOSPC;
/* (1) update the directory entry */
/* fill the dos name directory entry information of the created file.
* the first cluster is not determined yet. (0)
*/
ret = exfat_init_dir_entry(sb, p_dir, dentry, TYPE_FILE | mode,
CLUSTER_32(0), 0);
if (ret != 0)
return ret;
ret = exfat_init_ext_entry(sb, p_dir, dentry, num_entries, p_uniname,
&dos_name);
if (ret != 0)
return ret;
fid->dir.dir = p_dir->dir;
fid->dir.size = p_dir->size;
fid->dir.flags = p_dir->flags;
fid->entry = dentry;
fid->attr = ATTR_ARCHIVE | mode;
fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
fid->size = 0;
fid->start_clu = CLUSTER_32(~0);
fid->type = TYPE_FILE;
fid->rwoffset = 0;
fid->hint_last_off = -1;
return 0;
}
void remove_file(struct inode *inode, struct chain_t *p_dir, s32 entry)
{
s32 num_entries;
sector_t sector;
struct dentry_t *ep;
struct super_block *sb = inode->i_sb;
ep = get_entry_in_dir(sb, p_dir, entry, &sector);
if (!ep)
return;
exfat_buf_lock(sb, sector);
/* exfat_buf_lock() before call count_ext_entries() */
num_entries = exfat_count_ext_entries(sb, p_dir, entry, ep);
if (num_entries < 0) {
exfat_buf_unlock(sb, sector);
return;
}
num_entries++;
exfat_buf_unlock(sb, sector);
/* (1) update the directory entry */
exfat_delete_dir_entry(sb, p_dir, entry, 0, num_entries);
}
s32 exfat_rename_file(struct inode *inode, struct chain_t *p_dir, s32 oldentry,
struct uni_name_t *p_uniname, struct file_id_t *fid)
{
s32 ret, newentry = -1, num_old_entries, num_new_entries;
sector_t sector_old, sector_new;
struct dos_name_t dos_name;
struct dentry_t *epold, *epnew;
struct super_block *sb = inode->i_sb;
epold = get_entry_in_dir(sb, p_dir, oldentry, &sector_old);
if (!epold)
return -ENOENT;
exfat_buf_lock(sb, sector_old);
/* exfat_buf_lock() before call count_ext_entries() */
num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry,
epold);
if (num_old_entries < 0) {
exfat_buf_unlock(sb, sector_old);
return -ENOENT;
}
num_old_entries++;
ret = get_num_entries_and_dos_name(sb, p_dir, p_uniname,
&num_new_entries, &dos_name);
if (ret) {
exfat_buf_unlock(sb, sector_old);
return ret;
}
if (num_old_entries < num_new_entries) {
newentry = find_empty_entry(inode, p_dir, num_new_entries);
if (newentry < 0) {
exfat_buf_unlock(sb, sector_old);
return -ENOSPC;
}
epnew = get_entry_in_dir(sb, p_dir, newentry, &sector_new);
if (!epnew) {
exfat_buf_unlock(sb, sector_old);
return -ENOENT;
}
memcpy((void *)epnew, (void *)epold, DENTRY_SIZE);
if (exfat_get_entry_type(epnew) == TYPE_FILE) {
exfat_set_entry_attr(epnew,
exfat_get_entry_attr(epnew) |
ATTR_ARCHIVE);
fid->attr |= ATTR_ARCHIVE;
}
exfat_buf_modify(sb, sector_new);
exfat_buf_unlock(sb, sector_old);
epold = get_entry_in_dir(sb, p_dir, oldentry + 1,
&sector_old);
exfat_buf_lock(sb, sector_old);
epnew = get_entry_in_dir(sb, p_dir, newentry + 1,
&sector_new);
if (!epold || !epnew) {
exfat_buf_unlock(sb, sector_old);
return -ENOENT;
}
memcpy((void *)epnew, (void *)epold, DENTRY_SIZE);
exfat_buf_modify(sb, sector_new);
exfat_buf_unlock(sb, sector_old);
ret = exfat_init_ext_entry(sb, p_dir, newentry,
num_new_entries, p_uniname,
&dos_name);
if (ret != 0)
return ret;
exfat_delete_dir_entry(sb, p_dir, oldentry, 0,
num_old_entries);
fid->entry = newentry;
} else {
if (exfat_get_entry_type(epold) == TYPE_FILE) {
exfat_set_entry_attr(epold,
exfat_get_entry_attr(epold) |
ATTR_ARCHIVE);
fid->attr |= ATTR_ARCHIVE;
}
exfat_buf_modify(sb, sector_old);
exfat_buf_unlock(sb, sector_old);
ret = exfat_init_ext_entry(sb, p_dir, oldentry,
num_new_entries, p_uniname,
&dos_name);
if (ret != 0)
return ret;
exfat_delete_dir_entry(sb, p_dir, oldentry, num_new_entries,
num_old_entries);
}
return 0;
}
s32 move_file(struct inode *inode, struct chain_t *p_olddir, s32 oldentry,
struct chain_t *p_newdir, struct uni_name_t *p_uniname,
struct file_id_t *fid)
{
s32 ret, newentry, num_new_entries, num_old_entries;
sector_t sector_mov, sector_new;
struct dos_name_t dos_name;
struct dentry_t *epmov, *epnew;
struct super_block *sb = inode->i_sb;
epmov = get_entry_in_dir(sb, p_olddir, oldentry, &sector_mov);
if (!epmov)
return -ENOENT;
/* check if the source and target directory is the same */
if (exfat_get_entry_type(epmov) == TYPE_DIR &&
exfat_get_entry_clu0(epmov) == p_newdir->dir)
return -EINVAL;
exfat_buf_lock(sb, sector_mov);
/* exfat_buf_lock() before call count_ext_entries() */
num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
epmov);
if (num_old_entries < 0) {
exfat_buf_unlock(sb, sector_mov);
return -ENOENT;
}
num_old_entries++;
ret = get_num_entries_and_dos_name(sb, p_newdir, p_uniname,
&num_new_entries, &dos_name);
if (ret) {
exfat_buf_unlock(sb, sector_mov);
return ret;
}
newentry = find_empty_entry(inode, p_newdir, num_new_entries);
if (newentry < 0) {
exfat_buf_unlock(sb, sector_mov);
return -ENOSPC;
}
epnew = get_entry_in_dir(sb, p_newdir, newentry, &sector_new);
if (!epnew) {
exfat_buf_unlock(sb, sector_mov);
return -ENOENT;
}
memcpy((void *)epnew, (void *)epmov, DENTRY_SIZE);
if (exfat_get_entry_type(epnew) == TYPE_FILE) {
exfat_set_entry_attr(epnew, exfat_get_entry_attr(epnew) |
ATTR_ARCHIVE);
fid->attr |= ATTR_ARCHIVE;
}
exfat_buf_modify(sb, sector_new);
exfat_buf_unlock(sb, sector_mov);
epmov = get_entry_in_dir(sb, p_olddir, oldentry + 1,
&sector_mov);
exfat_buf_lock(sb, sector_mov);
epnew = get_entry_in_dir(sb, p_newdir, newentry + 1,
&sector_new);
if (!epmov || !epnew) {
exfat_buf_unlock(sb, sector_mov);
return -ENOENT;
}
memcpy((void *)epnew, (void *)epmov, DENTRY_SIZE);
exfat_buf_modify(sb, sector_new);
exfat_buf_unlock(sb, sector_mov);
ret = exfat_init_ext_entry(sb, p_newdir, newentry, num_new_entries,
p_uniname, &dos_name);
if (ret != 0)
return ret;
exfat_delete_dir_entry(sb, p_olddir, oldentry, 0, num_old_entries);
fid->dir.dir = p_newdir->dir;
fid->dir.size = p_newdir->size;
fid->dir.flags = p_newdir->flags;
fid->entry = newentry;
return 0;
}
/*
* Sector Read/Write Functions
*/
int sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh,
bool read)
{
s32 ret = -EIO;
struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
if ((sec >= (p_fs->PBR_sector + p_fs->num_sectors)) &&
(p_fs->num_sectors > 0)) {
pr_err("[EXFAT] %s: out of range error! (sec = %llu)\n",
__func__, (unsigned long long)sec);
fs_error(sb);
return ret;
}
if (!p_fs->dev_ejected) {
ret = exfat_bdev_read(sb, sec, bh, 1, read);
if (ret != 0)
p_fs->dev_ejected = 1;
}
return ret;
}
int sector_write(struct super_block *sb, sector_t sec, struct buffer_head