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Copy pathcore_exfat.c
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core_exfat.c
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/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : core_exfat.c */
/* PURPOSE : exFAT-fs core code for exFAT */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/* */
/************************************************************************/
#include <linux/version.h>
#include <linux/blkdev.h>
#include <linux/workqueue.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include "exfat.h"
#include "core.h"
#include <asm/byteorder.h>
#include <asm/unaligned.h>
/*----------------------------------------------------------------------*/
/* Constant & Macro Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Local Variable Definitions */
/*----------------------------------------------------------------------*/
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*/
};
/*======================================================================*/
/* Local Function Definitions */
/*======================================================================*/
/*
* Directory Entry Management Functions
*/
static u32 exfat_get_entry_type(DENTRY_T *p_entry)
{
FILE_DENTRY_T *ep = (FILE_DENTRY_T *) p_entry;
if (ep->type == EXFAT_UNUSED)
return TYPE_UNUSED;
if (ep->type < 0x80)
return TYPE_DELETED;
if (ep->type == 0x80)
return TYPE_INVALID;
if (ep->type < 0xA0) {
if (ep->type == 0x81)
return TYPE_BITMAP;
if (ep->type == 0x82)
return TYPE_UPCASE;
if (ep->type == 0x83)
return TYPE_VOLUME;
if (ep->type == 0x85) {
if (le16_to_cpu(ep->attr) & ATTR_SUBDIR)
return TYPE_DIR;
return TYPE_FILE;
}
return TYPE_CRITICAL_PRI;
}
if (ep->type < 0xC0) {
if (ep->type == 0xA0)
return TYPE_GUID;
if (ep->type == 0xA1)
return TYPE_PADDING;
if (ep->type == 0xA2)
return TYPE_ACLTAB;
return TYPE_BENIGN_PRI;
}
if (ep->type < 0xE0) {
if (ep->type == 0xC0)
return TYPE_STREAM;
if (ep->type == 0xC1)
return TYPE_EXTEND;
if (ep->type == 0xC2)
return TYPE_ACL;
return TYPE_CRITICAL_SEC;
}
return TYPE_BENIGN_SEC;
} /* end of exfat_get_entry_type */
static void exfat_set_entry_type(DENTRY_T *p_entry, u32 type)
{
FILE_DENTRY_T *ep = (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;
ep->attr = cpu_to_le16(ATTR_SUBDIR);
} else if (type == TYPE_FILE) {
ep->type = 0x85;
ep->attr = cpu_to_le16(ATTR_ARCHIVE);
} else if (type == TYPE_SYMLINK) {
ep->type = 0x85;
ep->attr = cpu_to_le16(ATTR_ARCHIVE | ATTR_SYMLINK);
}
} /* end of exfat_set_entry_type */
static u32 exfat_get_entry_attr(DENTRY_T *p_entry)
{
FILE_DENTRY_T *ep = (FILE_DENTRY_T *)p_entry;
return (u32)le16_to_cpu(ep->attr);
} /* end of exfat_get_entry_attr */
static void exfat_set_entry_attr(DENTRY_T *p_entry, u32 attr)
{
FILE_DENTRY_T *ep = (FILE_DENTRY_T *)p_entry;
ep->attr = cpu_to_le16((u16) attr);
} /* end of exfat_set_entry_attr */
static u8 exfat_get_entry_flag(DENTRY_T *p_entry)
{
STRM_DENTRY_T *ep = (STRM_DENTRY_T *)p_entry;
return ep->flags;
} /* end of exfat_get_entry_flag */
static void exfat_set_entry_flag(DENTRY_T *p_entry, u8 flags)
{
STRM_DENTRY_T *ep = (STRM_DENTRY_T *)p_entry;
ep->flags = flags;
} /* end of exfat_set_entry_flag */
static u32 exfat_get_entry_clu0(DENTRY_T *p_entry)
{
STRM_DENTRY_T *ep = (STRM_DENTRY_T *)p_entry;
return (u32)le32_to_cpu(ep->start_clu);
} /* end of exfat_get_entry_clu0 */
static void exfat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu)
{
STRM_DENTRY_T *ep = (STRM_DENTRY_T *)p_entry;
ep->start_clu = cpu_to_le32(start_clu);
} /* end of exfat_set_entry_clu0 */
static u64 exfat_get_entry_size(DENTRY_T *p_entry)
{
STRM_DENTRY_T *ep = (STRM_DENTRY_T *)p_entry;
return le64_to_cpu(ep->valid_size);
} /* end of exfat_get_entry_size */
static void exfat_set_entry_size(DENTRY_T *p_entry, u64 size)
{
STRM_DENTRY_T *ep = (STRM_DENTRY_T *)p_entry;
ep->valid_size = cpu_to_le64(size);
ep->size = cpu_to_le64(size);
} /* end of exfat_set_entry_size */
static void exfat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode)
{
u16 t = 0x00, d = 0x21;
FILE_DENTRY_T *ep = (FILE_DENTRY_T *)p_entry;
switch (mode) {
case TM_CREATE:
t = le16_to_cpu(ep->create_time);
d = le16_to_cpu(ep->create_date);
break;
case TM_MODIFY:
t = le16_to_cpu(ep->modify_time);
d = le16_to_cpu(ep->modify_date);
break;
case TM_ACCESS:
t = le16_to_cpu(ep->access_time);
d = le16_to_cpu(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);
} /* end of exfat_get_entry_time */
static void exfat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode)
{
u16 t, d;
FILE_DENTRY_T *ep = (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:
ep->create_time = cpu_to_le16(t);
ep->create_date = cpu_to_le16(d);
break;
case TM_MODIFY:
ep->modify_time = cpu_to_le16(t);
ep->modify_date = cpu_to_le16(d);
break;
case TM_ACCESS:
ep->access_time = cpu_to_le16(t);
ep->access_date = cpu_to_le16(d);
break;
}
} /* end of exfat_set_entry_time */
static void __init_file_entry(struct super_block *sb, FILE_DENTRY_T *ep, u32 type)
{
TIMESTAMP_T tm, *tp;
exfat_set_entry_type((DENTRY_T *) ep, type);
tp = tm_now(EXFAT_SB(sb), &tm);
exfat_set_entry_time((DENTRY_T *) ep, tp, TM_CREATE);
exfat_set_entry_time((DENTRY_T *) ep, tp, TM_MODIFY);
exfat_set_entry_time((DENTRY_T *) ep, tp, TM_ACCESS);
ep->create_time_ms = 0;
ep->modify_time_ms = 0;
ep->access_time_ms = 0;
} /* end of __init_file_entry */
static void __init_strm_entry(STRM_DENTRY_T *ep, u8 flags, u32 start_clu, u64 size)
{
exfat_set_entry_type((DENTRY_T *) ep, TYPE_STREAM);
ep->flags = flags;
ep->start_clu = cpu_to_le32(start_clu);
ep->valid_size = cpu_to_le64(size);
ep->size = cpu_to_le64(size);
} /* end of __init_strm_entry */
static void __init_name_entry(NAME_DENTRY_T *ep, u16 *uniname)
{
s32 i;
exfat_set_entry_type((DENTRY_T *) ep, TYPE_EXTEND);
ep->flags = 0x0;
for (i = 0; i < 15; i++) {
ep->unicode_0_14[i] = cpu_to_le16(*uniname);
if (*uniname == 0x0)
break;
uniname++;
}
} /* end of __init_name_entry */
static s32 exfat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, u32 start_clu, u64 size)
{
u64 sector;
u8 flags;
FILE_DENTRY_T *file_ep;
STRM_DENTRY_T *strm_ep;
flags = (type == TYPE_FILE) ? 0x01 : 0x03;
/* we cannot use get_dentry_set_in_dir here because file ep is not initialized yet */
file_ep = (FILE_DENTRY_T *)get_dentry_in_dir(sb, p_dir, entry, §or);
if (!file_ep)
return -EIO;
strm_ep = (STRM_DENTRY_T *)get_dentry_in_dir(sb, p_dir, entry+1, §or);
if (!strm_ep)
return -EIO;
__init_file_entry(sb, file_ep, type);
if (dcache_modify(sb, sector))
return -EIO;
__init_strm_entry(strm_ep, flags, start_clu, size);
if (dcache_modify(sb, sector))
return -EIO;
return 0;
} /* end of exfat_init_dir_entry */
s32 update_dir_chksum(struct super_block *sb, CHAIN_T *p_dir, s32 entry)
{
s32 ret = -EIO;
s32 i, num_entries;
u64 sector;
u16 chksum;
FILE_DENTRY_T *file_ep;
DENTRY_T *ep;
file_ep = (FILE_DENTRY_T *)get_dentry_in_dir(sb, p_dir, entry, §or);
if (!file_ep)
return -EIO;
dcache_lock(sb, sector);
num_entries = (s32) file_ep->num_ext + 1;
chksum = calc_chksum_2byte((void *) file_ep, DENTRY_SIZE, 0, CS_DIR_ENTRY);
for (i = 1; i < num_entries; i++) {
ep = get_dentry_in_dir(sb, p_dir, entry+i, NULL);
if (!ep)
goto out_unlock;
chksum = calc_chksum_2byte((void *) ep, DENTRY_SIZE, chksum, CS_DEFAULT);
}
file_ep->checksum = cpu_to_le16(chksum);
ret = dcache_modify(sb, sector);
out_unlock:
dcache_unlock(sb, sector);
return ret;
} /* end of update_dir_chksum */
static s32 exfat_init_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries,
UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname)
{
s32 i;
u64 sector;
u16 *uniname = p_uniname->name;
FILE_DENTRY_T *file_ep;
STRM_DENTRY_T *strm_ep;
NAME_DENTRY_T *name_ep;
file_ep = (FILE_DENTRY_T *)get_dentry_in_dir(sb, p_dir, entry, §or);
if (!file_ep)
return -EIO;
file_ep->num_ext = (u8)(num_entries - 1);
dcache_modify(sb, sector);
strm_ep = (STRM_DENTRY_T *)get_dentry_in_dir(sb, p_dir, entry+1, §or);
if (!strm_ep)
return -EIO;
strm_ep->name_len = p_uniname->name_len;
strm_ep->name_hash = cpu_to_le16(p_uniname->name_hash);
dcache_modify(sb, sector);
for (i = 2; i < num_entries; i++) {
name_ep = (NAME_DENTRY_T *)get_dentry_in_dir(sb, p_dir, entry+i, §or);
if (!name_ep)
return -EIO;
__init_name_entry(name_ep, uniname);
dcache_modify(sb, sector);
uniname += 15;
}
update_dir_chksum(sb, p_dir, entry);
return 0;
} /* end of exfat_init_ext_entry */
static s32 exfat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries)
{
s32 i;
u64 sector;
DENTRY_T *ep;
for (i = order; i < num_entries; i++) {
ep = get_dentry_in_dir(sb, p_dir, entry+i, §or);
if (!ep)
return -EIO;
exfat_set_entry_type(ep, TYPE_DELETED);
if (dcache_modify(sb, sector))
return -EIO;
}
return 0;
}
static s32 __write_partial_entries_in_entry_set(struct super_block *sb,
ENTRY_SET_CACHE_T *es, u64 sec, u32 off, u32 count)
{
s32 num_entries;
u32 buf_off = (off - es->offset);
u32 remaining_byte_in_sector, copy_entries;
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
u32 clu;
u8 *buf, *esbuf = (u8 *)&(es->__buf);
TMSG("%s entered\n", __func__);
MMSG("%s: es %p sec %llu off %u cnt %d\n", __func__, es, sec, off, count);
num_entries = count;
while (num_entries) {
/* write per sector base */
remaining_byte_in_sector = (1 << sb->s_blocksize_bits) - off;
copy_entries = min((s32)(remaining_byte_in_sector >> DENTRY_SIZE_BITS), num_entries);
buf = dcache_getblk(sb, sec);
if (!buf)
goto err_out;
MMSG("es->buf %p buf_off %u\n", esbuf, buf_off);
MMSG("copying %d entries from %p to sector %llu\n", copy_entries, (esbuf + buf_off), sec);
memcpy(buf + off, esbuf + buf_off, copy_entries << DENTRY_SIZE_BITS);
dcache_modify(sb, sec);
num_entries -= copy_entries;
if (num_entries) {
// get next sector
if (IS_LAST_SECT_IN_CLUS(fsi, sec)) {
clu = SECT_TO_CLUS(fsi, sec);
if (es->alloc_flag == 0x03)
clu++;
else if (get_next_clus_safe(sb, &clu))
goto err_out;
sec = CLUS_TO_SECT(fsi, clu);
} else {
sec++;
}
off = 0;
buf_off += copy_entries << DENTRY_SIZE_BITS;
}
}
TMSG("%s exited successfully\n", __func__);
return 0;
err_out:
TMSG("%s failed\n", __func__);
return -EIO;
}
/* write back all entries in entry set */
static s32 __write_whole_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es)
{
return __write_partial_entries_in_entry_set(sb, es, es->sector, es->offset, es->num_entries);
}
s32 update_dir_chksum_with_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es)
{
DENTRY_T *ep;
u16 chksum = 0;
s32 chksum_type = CS_DIR_ENTRY, i;
ep = (DENTRY_T *)&(es->__buf);
for (i = 0; i < es->num_entries; i++) {
MMSG("%s %p\n", __func__, ep);
chksum = calc_chksum_2byte((void *) ep, DENTRY_SIZE, chksum, chksum_type);
ep++;
chksum_type = CS_DEFAULT;
}
ep = (DENTRY_T *)&(es->__buf);
((FILE_DENTRY_T *)ep)->checksum = cpu_to_le16(chksum);
return __write_whole_entry_set(sb, es);
}
/* 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
ENTRY_SET_CACHE_T *get_dentry_set_in_dir(struct super_block *sb,
CHAIN_T *p_dir, s32 entry, u32 type, DENTRY_T **file_ep)
{
s32 ret;
u32 off, byte_offset, clu = 0;
u32 entry_type;
u64 sec;
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
ENTRY_SET_CACHE_T *es = NULL;
DENTRY_T *ep, *pos;
u8 *buf;
u8 num_entries;
s32 mode = ES_MODE_STARTED;
/* FIXME : is available in error case? */
if (p_dir->dir == DIR_DELETED) {
EMSG("%s : access to deleted dentry\n", __func__);
BUG_ON(!fsi->prev_eio);
return NULL;
}
TMSG("%s entered\n", __func__);
MMSG("p_dir dir %u flags %x size %d\n", p_dir->dir, p_dir->flags, p_dir->size);
MMSG("entry %d type %d\n", entry, type);
byte_offset = entry << DENTRY_SIZE_BITS;
ret = walk_fat_chain(sb, p_dir, byte_offset, &clu);
if (ret)
return NULL;
/* byte offset in cluster */
byte_offset &= fsi->cluster_size - 1;
/* byte offset in sector */
off = byte_offset & (u32)(sb->s_blocksize - 1);
/* sector offset in cluster */
sec = byte_offset >> (sb->s_blocksize_bits);
sec += CLUS_TO_SECT(fsi, clu);
buf = dcache_getblk(sb, sec);
if (!buf)
goto err_out;
ep = (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 = ((FILE_DENTRY_T *)ep)->num_ext+1;
else
num_entries = type;
MMSG("trying to malloc %lx bytes for %d entries\n",
(unsigned long)(offsetof(ENTRY_SET_CACHE_T, __buf) + (num_entries) * sizeof(DENTRY_T)), num_entries);
es = kmalloc((offsetof(ENTRY_SET_CACHE_T, __buf) + (num_entries) * sizeof(DENTRY_T)), GFP_KERNEL);
if (!es) {
EMSG("%s: failed to alloc entryset\n", __func__);
goto err_out;
}
es->num_entries = num_entries;
es->sector = sec;
es->offset = off;
es->alloc_flag = p_dir->flags;
pos = (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;
}
/* copy dentry */
memcpy(pos, ep, sizeof(DENTRY_T));
if (--num_entries == 0)
break;
if (((off + DENTRY_SIZE) & (u32)(sb->s_blocksize - 1)) <
(off & (u32)(sb->s_blocksize - 1))) {
// get the next sector
if (IS_LAST_SECT_IN_CLUS(fsi, sec)) {
if (es->alloc_flag == 0x03)
clu++;
else if (get_next_clus_safe(sb, &clu))
goto err_out;
sec = CLUS_TO_SECT(fsi, clu);
} else {
sec++;
}
buf = dcache_getblk(sb, sec);
if (!buf)
goto err_out;
off = 0;
ep = (DENTRY_T *)(buf);
} else {
ep++;
off += DENTRY_SIZE;
}
pos++;
}
if (file_ep)
*file_ep = (DENTRY_T *)&(es->__buf);
MMSG("es sec %llu offset %u flags %d, num_entries %u buf ptr %p\n",
es->sector, es->offset, es->alloc_flag, es->num_entries, &(es->__buf));
TMSG("%s exited %p\n", __func__, es);
return es;
err_out:
TMSG("%s exited (return NULL) (es %p)\n", __func__, es);
/* kfree(NULL) is safe */
kfree(es);
es = NULL;
return NULL;
}
void release_dentry_set(ENTRY_SET_CACHE_T *es)
{
TMSG("%s %p\n", __func__, es);
/* kfree(NULL) is safe */
kfree(es);
es = NULL;
}
static s32 __extract_uni_name_from_name_entry(NAME_DENTRY_T *ep, u16 *uniname, s32 order)
{
s32 i, len = 0;
for (i = 0; i < 15; i++) {
/* FIXME : unaligned? */
*uniname = le16_to_cpu(ep->unicode_0_14[i]);
if (*uniname == 0x0)
return len;
uniname++;
len++;
}
*uniname = 0x0;
return len;
} /* end of __extract_uni_name_from_name_entry */
#define DIRENT_STEP_FILE (0)
#define DIRENT_STEP_STRM (1)
#define DIRENT_STEP_NAME (2)
#define DIRENT_STEP_SECD (3)
/* return values of exfat_find_dir_entry()
* >= 0 : return dir entiry position with the name in dir
* -EEXIST : (root dir, ".") it is the root dir itself
* -ENOENT : entry with the name does not exist
* -EIO : I/O error
*/
static s32 exfat_find_dir_entry(struct super_block *sb, FILE_ID_T *fid,
CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *unused, u32 type)
{
s32 i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len;
s32 order, step, name_len = 0;
s32 dentries_per_clu, num_empty = 0;
u32 entry_type;
u16 entry_uniname[16], *uniname = NULL, unichar;
CHAIN_T clu;
DENTRY_T *ep;
HINT_T *hint_stat = &fid->hint_stat;
HINT_FEMP_T candi_empty;
FILE_DENTRY_T *file_ep;
STRM_DENTRY_T *strm_ep;
NAME_DENTRY_T *name_ep;
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
/*
* REMARK:
* DOT and DOTDOT are handled by VFS layer
*/
if (IS_CLUS_FREE(p_dir->dir))
return -EIO;
dentries_per_clu = fsi->dentries_per_clu;
clu.dir = p_dir->dir;
clu.size = p_dir->size;
clu.flags = p_dir->flags;
if (hint_stat->eidx) {
clu.dir = hint_stat->clu;
dentry = hint_stat->eidx;
end_eidx = dentry;
}
candi_empty.eidx = -1;
rewind:
order = 0;
step = DIRENT_STEP_FILE;
while (!IS_CLUS_EOF(clu.dir)) {
i = dentry & (dentries_per_clu - 1);
for (; i < dentries_per_clu; i++, dentry++) {
if (rewind && (dentry == end_eidx))
goto not_found;
ep = get_dentry_in_dir(sb, &clu, i, NULL);
if (!ep)
return -EIO;
entry_type = exfat_get_entry_type(ep);
if ((entry_type == TYPE_UNUSED) || (entry_type == TYPE_DELETED)) {
step = DIRENT_STEP_FILE;
num_empty++;
if (candi_empty.eidx == -1) {
if (num_empty == 1) {
candi_empty.cur.dir = clu.dir;
candi_empty.cur.size = clu.size;
candi_empty.cur.flags = clu.flags;
}
if (num_empty >= num_entries) {
candi_empty.eidx = dentry - (num_empty - 1);
ASSERT(0 <= candi_empty.eidx);
candi_empty.count = num_empty;
if ((fid->hint_femp.eidx == -1) ||
(candi_empty.eidx <= fid->hint_femp.eidx)) {
memcpy(&fid->hint_femp,
&candi_empty,
sizeof(HINT_FEMP_T));
}
}
}
if (entry_type == TYPE_UNUSED)
goto not_found;
continue;
}
num_empty = 0;
candi_empty.eidx = -1;
if ((entry_type == TYPE_FILE) || (entry_type == TYPE_DIR)) {
step = DIRENT_STEP_FILE;
if ((type == TYPE_ALL) || (type == entry_type)) {
file_ep = (FILE_DENTRY_T *) ep;
num_ext = file_ep->num_ext;
step = DIRENT_STEP_STRM;
}
continue;
}
if (entry_type == TYPE_STREAM) {
if (step != DIRENT_STEP_STRM) {
step = DIRENT_STEP_FILE;
continue;
}
step = DIRENT_STEP_FILE;
strm_ep = (STRM_DENTRY_T *) ep;
if ((p_uniname->name_hash == le16_to_cpu(strm_ep->name_hash)) &&
(p_uniname->name_len == strm_ep->name_len)) {
step = DIRENT_STEP_NAME;
order = 1;
name_len = 0;
}
continue;
}
if (entry_type == TYPE_EXTEND) {
if (step != DIRENT_STEP_NAME) {
step = DIRENT_STEP_FILE;
continue;
}
name_ep = (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);
name_len += len;
unichar = *(uniname+len);
*(uniname+len) = 0x0;
if (nls_cmp_uniname(sb, uniname, entry_uniname)) {
step = DIRENT_STEP_FILE;
} else if (name_len == p_uniname->name_len) {
if (order == num_ext) {
//fid->hint_femp.eidx = -1;
goto found;
}
step = DIRENT_STEP_SECD;
}
*(uniname+len) = unichar;
continue;
}
if (entry_type & (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) {
if (step == DIRENT_STEP_SECD) {
if (++order == num_ext)
goto found;
continue;
}
}
step = DIRENT_STEP_FILE;
}
if (clu.flags == 0x03) {
if ((--clu.size) > 0)
clu.dir++;
else
clu.dir = CLUS_EOF;
} else {
if (get_next_clus_safe(sb, &clu.dir))
return -EIO;
}
}
not_found:
/* we started at not 0 index,so we should try to find target
* from 0 index to the index we started at.
*/
if (!rewind && end_eidx) {
rewind = 1;
dentry = 0;
clu.dir = p_dir->dir;
/* reset empty hint */
num_empty = 0;
candi_empty.eidx = -1;
goto rewind;
}
/* initialized hint_stat */
hint_stat->clu = p_dir->dir;
hint_stat->eidx = 0;
return -ENOENT;
found:
/* next dentry we'll find is out of this cluster */
if (!((dentry + 1) & (dentries_per_clu-1))) {
int ret = 0;
if (clu.flags == 0x03) {
if ((--clu.size) > 0)
clu.dir++;
else
clu.dir = CLUS_EOF;
} else {
ret = get_next_clus_safe(sb, &clu.dir);
}
if (ret || IS_CLUS_EOF(clu.dir)) {
/* just initialized hint_stat */
hint_stat->clu = p_dir->dir;
hint_stat->eidx = 0;
return (dentry - num_ext);
}
}
hint_stat->clu = clu.dir;
hint_stat->eidx = dentry + 1;
return (dentry - num_ext);
} /* end of exfat_find_dir_entry */
/* returns -EIO on error */
static s32 exfat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry)
{
s32 i, count = 0;
u32 type;
FILE_DENTRY_T *file_ep = (FILE_DENTRY_T *) p_entry;
DENTRY_T *ext_ep;
for (i = 0, entry++; i < file_ep->num_ext; i++, entry++) {
ext_ep = get_dentry_in_dir(sb, p_dir, entry, NULL);
if (!ext_ep)
return -EIO;
type = exfat_get_entry_type(ext_ep);
if ((type == TYPE_EXTEND) || (type == TYPE_STREAM))
count++;
else
return count;
}
return count;
} /* end of exfat_count_ext_entries */
/*
* Name Conversion Functions
*/
static void exfat_get_uniname_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname)
{
s32 i;
DENTRY_T *ep;
ENTRY_SET_CACHE_T *es;
es = get_dentry_set_in_dir(sb, p_dir, entry, ES_ALL_ENTRIES, &ep);
if (!es)
return;
if (es->num_entries < 3)
goto out;
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++) {
/* end of name entry */
if (exfat_get_entry_type(ep) != TYPE_EXTEND)
goto out;
__extract_uni_name_from_name_entry((NAME_DENTRY_T *)ep, uniname, i);
uniname += 15;
}