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exfat.c
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exfat.c
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/* Some of the source code in this file came from "linux/fs/fat/misc.c". */
/*
* linux/fs/fat/misc.c
*
* Written 1992,1993 by Werner Almesberger
* 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
* and date_dos2unix for date==0 by Igor Zhbanov([email protected])
*/
/*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/version.h>
#include "exfat_config.h"
#include "exfat_global.h"
#include "exfat_data.h"
#include "exfat_oal.h"
#include "exfat_blkdev.h"
#include "exfat_cache.h"
#include "exfat_nls.h"
#include "exfat_api.h"
#include "exfat_super.h"
#include "exfat.h"
#include <linux/blkdev.h>
#define THERE_IS_MBR 0
#if (THERE_IS_MBR == 1)
#include "exfat_part.h"
#endif
#define DELAYED_SYNC 0
#define ELAPSED_TIME 0
#if (ELAPSED_TIME == 1)
#include <linux/time.h>
static u32 __t1, __t2;
static u32 get_current_msec(void)
{
struct timeval tm;
do_gettimeofday(&tm);
return (u32)(tm.tv_sec*1000000 + tm.tv_usec);
}
#define TIME_START() do {__t1 = get_current_msec(); } while (0)
#define TIME_END() do {__t2 = get_current_msec(); } while (0)
#define PRINT_TIME(n) do {printk("[EXFAT] Elapsed time %d = %d (usec)\n", n, (__t2 - __t1)); } while (0)
#else
#define TIME_START()
#define TIME_END()
#define PRINT_TIME(n)
#endif
static void __set_sb_dirty(struct super_block *sb)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
sb->s_dirt = 1;
#else
struct exfat_sb_info *sbi = EXFAT_SB(sb);
sbi->s_dirt = 1;
#endif
}
extern u8 uni_upcase[];
static u8 name_buf[MAX_PATH_LENGTH *MAX_CHARSET_SIZE];
static s8 *reserved_names[] = {
"AUX ", "CON ", "NUL ", "PRN ",
"COM1 ", "COM2 ", "COM3 ", "COM4 ",
"COM5 ", "COM6 ", "COM7 ", "COM8 ", "COM9 ",
"LPT1 ", "LPT2 ", "LPT3 ", "LPT4 ",
"LPT5 ", "LPT6 ", "LPT7 ", "LPT8 ", "LPT9 ",
NULL
};
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, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2,
0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2,
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2,
0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5,
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2,
0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3,
0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2,
0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4,
0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
};
static u8 used_bit[] = {
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3,
2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4,
2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5,
4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4,
3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6,
4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4,
3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5,
4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5,
3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6,
5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
};
s32 ffsInit(void)
{
s32 ret;
ret = bdev_init();
if (ret)
return ret;
ret = fs_init();
if (ret)
return ret;
return FFS_SUCCESS;
}
s32 ffsShutdown(void)
{
s32 ret;
ret = fs_shutdown();
if (ret)
return ret;
ret = bdev_shutdown();
if (ret)
return ret;
return FFS_SUCCESS;
}
s32 ffsMountVol(struct super_block *sb, s32 drv)
{
s32 i, ret;
#if (THERE_IS_MBR == 1)
MBR_SECTOR_T *p_mbr;
PART_ENTRY_T *p_pte;
#endif
PBR_SECTOR_T *p_pbr;
struct buffer_head *tmp_bh = NULL;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
p_fs->drv = drv;
p_fs->dev_ejected = FALSE;
if (bdev_open(sb))
return FFS_MEDIAERR;
if (p_bd->sector_size < sb->s_blocksize)
return FFS_MEDIAERR;
if (p_bd->sector_size > sb->s_blocksize)
sb_set_blocksize(sb, p_bd->sector_size);
if (sector_read(sb, 0, &tmp_bh, 1) != FFS_SUCCESS)
return FFS_MEDIAERR;
#if (THERE_IS_MBR == 1)
if (buf[0] != 0xEB) {
p_mbr = (MBR_SECTOR_T *) tmp_bh->b_data;
if (GET16_A(p_mbr->signature) != MBR_SIGNATURE) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_FORMATERR;
}
p_pte = (PART_ENTRY_T *) p_mbr->partition + 0;
p_fs->PBR_sector = GET32(p_pte->start_sector);
p_fs->num_sectors = GET32(p_pte->num_sectors);
if (p_fs->num_sectors == 0) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_ERROR;
}
if (sector_read(sb, p_fs->PBR_sector, &tmp_bh, 1) != FFS_SUCCESS) {
bdev_close(sb);
return FFS_MEDIAERR;
}
} else {
#endif
p_fs->PBR_sector = 0;
#if (THERE_IS_MBR == 1)
}
#endif
p_pbr = (PBR_SECTOR_T *) tmp_bh->b_data;
if (GET16_A(p_pbr->signature) != PBR_SIGNATURE) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_FORMATERR;
}
for (i = 0; i < 53; i++)
if (p_pbr->bpb[i])
break;
ret = FFS_FORMATERR;
if (i >= 53)
ret = exfat_mount(sb, p_pbr);
brelse(tmp_bh);
if (ret) {
bdev_close(sb);
return ret;
}
if (p_fs->vol_type == EXFAT) {
ret = load_alloc_bitmap(sb);
if (ret) {
bdev_close(sb);
return ret;
}
ret = load_upcase_table(sb);
if (ret) {
free_alloc_bitmap(sb);
bdev_close(sb);
return ret;
}
}
if (p_fs->dev_ejected) {
if (p_fs->vol_type == EXFAT) {
free_upcase_table(sb);
free_alloc_bitmap(sb);
}
bdev_close(sb);
return FFS_MEDIAERR;
}
return FFS_SUCCESS;
}
s32 ffsUmountVol(struct super_block *sb)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
if (p_fs->vol_type == EXFAT) {
free_upcase_table(sb);
free_alloc_bitmap(sb);
}
FAT_release_all(sb);
buf_release_all(sb);
bdev_close(sb);
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
}
s32 ffsGetVolInfo(struct super_block *sb, VOL_INFO_T *info)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
if (p_fs->used_clusters == (u32) ~0)
p_fs->used_clusters = p_fs->fs_func->count_used_clusters(sb);
info->FatType = p_fs->vol_type;
info->ClusterSize = p_fs->cluster_size;
info->NumClusters = p_fs->num_clusters - 2;
info->UsedClusters = p_fs->used_clusters;
info->FreeClusters = info->NumClusters - info->UsedClusters;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
}
s32 ffsSyncVol(struct super_block *sb, s32 do_sync)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
fs_sync(sb, do_sync);
fs_set_vol_flags(sb, VOL_CLEAN);
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
}
s32 ffsLookupFile(struct inode *inode, u8 *path, FILE_ID_T *fid)
{
s32 ret, dentry, num_entries;
CHAIN_T dir;
UNI_NAME_T uni_name;
DOS_NAME_T dos_name;
DENTRY_T *ep, *ep2;
ENTRY_SET_CACHE_T *es=NULL;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
PRINTK("ffsLookupFile entered\n");
ret = resolve_path(inode, path, &dir, &uni_name);
if (ret)
return ret;
ret = get_num_entries_and_dos_name(sb, &dir, &uni_name, &num_entries, &dos_name);
if (ret)
return ret;
dentry = p_fs->fs_func->find_dir_entry(sb, &dir, &uni_name, num_entries, &dos_name, TYPE_ALL);
if (dentry < -1)
return FFS_NOTFOUND;
fid->dir.dir = dir.dir;
fid->dir.size = dir.size;
fid->dir.flags = dir.flags;
fid->entry = dentry;
if (dentry == -1) {
fid->type = TYPE_DIR;
fid->rwoffset = 0;
fid->hint_last_off = -1;
fid->attr = ATTR_SUBDIR;
fid->flags = 0x01;
fid->size = 0;
fid->start_clu = p_fs->root_dir;
} else {
if (p_fs->vol_type == EXFAT) {
es = get_entry_set_in_dir(sb, &dir, dentry, ES_2_ENTRIES, &ep);
if (!es)
return FFS_MEDIAERR;
ep2 = ep+1;
} else {
ep = get_entry_in_dir(sb, &dir, dentry, NULL);
if (!ep)
return FFS_MEDIAERR;
ep2 = ep;
}
fid->type = p_fs->fs_func->get_entry_type(ep);
fid->rwoffset = 0;
fid->hint_last_off = -1;
fid->attr = p_fs->fs_func->get_entry_attr(ep);
fid->size = p_fs->fs_func->get_entry_size(ep2);
if ((fid->type == TYPE_FILE) && (fid->size == 0)) {
fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
fid->start_clu = CLUSTER_32(~0);
} else {
fid->flags = p_fs->fs_func->get_entry_flag(ep2);
fid->start_clu = p_fs->fs_func->get_entry_clu0(ep2);
}
if (p_fs->vol_type == EXFAT)
release_entry_set(es);
}
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
PRINTK("ffsLookupFile exited successfully\n");
return FFS_SUCCESS;
}
s32 ffsCreateFile(struct inode *inode, u8 *path, u8 mode, FILE_ID_T *fid)
{
s32 ret;
CHAIN_T dir;
UNI_NAME_T uni_name;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
ret = resolve_path(inode, path, &dir, &uni_name);
if (ret)
return ret;
fs_set_vol_flags(sb, VOL_DIRTY);
ret = create_file(inode, &dir, &uni_name, mode, fid);
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return ret;
}
s32 ffsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount)
{
s32 offset, sec_offset, clu_offset;
u32 clu;
sector_t LogSector;
u64 oneblkread, read_bytes;
struct buffer_head *tmp_bh = NULL;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
if (fid->type != TYPE_FILE)
return FFS_PERMISSIONERR;
if (fid->rwoffset > fid->size)
fid->rwoffset = fid->size;
if (count > (fid->size - fid->rwoffset))
count = fid->size - fid->rwoffset;
if (count == 0) {
if (rcount != NULL)
*rcount = 0;
return FFS_EOF;
}
read_bytes = 0;
while (count > 0) {
clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
clu = fid->start_clu;
if (fid->flags == 0x03) {
clu += clu_offset;
} else {
if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
(clu_offset >= fid->hint_last_off)) {
clu_offset -= fid->hint_last_off;
clu = fid->hint_last_clu;
}
while (clu_offset > 0) {
if (FAT_read(sb, clu, &clu) == -1)
return FFS_MEDIAERR;
clu_offset--;
}
}
fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
fid->hint_last_clu = clu;
offset = (s32)(fid->rwoffset & (p_fs->cluster_size-1));
sec_offset = offset >> p_bd->sector_size_bits;
offset &= p_bd->sector_size_mask;
LogSector = START_SECTOR(clu) + sec_offset;
oneblkread = (u64)(p_bd->sector_size - offset);
if (oneblkread > count)
oneblkread = count;
if ((offset == 0) && (oneblkread == p_bd->sector_size)) {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
MEMCPY(((s8 *) buffer)+read_bytes, ((s8 *) tmp_bh->b_data), (s32) oneblkread);
} else {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
MEMCPY(((s8 *) buffer)+read_bytes, ((s8 *) tmp_bh->b_data)+offset, (s32) oneblkread);
}
count -= oneblkread;
read_bytes += oneblkread;
fid->rwoffset += oneblkread;
}
brelse(tmp_bh);
err_out:
if (rcount != NULL)
*rcount = read_bytes;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
}
s32 ffsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *wcount)
{
s32 modified = FALSE, offset, sec_offset, clu_offset;
s32 num_clusters, num_alloc, num_alloced = (s32) ~0;
u32 clu, last_clu;
sector_t LogSector, sector = 0;
u64 oneblkwrite, write_bytes;
CHAIN_T new_clu;
TIMESTAMP_T tm;
DENTRY_T *ep, *ep2;
ENTRY_SET_CACHE_T *es = NULL;
struct buffer_head *tmp_bh = NULL;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
u8 tz_utc = EXFAT_SB(sb)->options.tz_utc;
if (fid->type != TYPE_FILE)
return FFS_PERMISSIONERR;
if (fid->rwoffset > fid->size)
fid->rwoffset = fid->size;
if (count == 0) {
if (wcount != NULL)
*wcount = 0;
return FFS_SUCCESS;
}
fs_set_vol_flags(sb, VOL_DIRTY);
if (fid->size == 0)
num_clusters = 0;
else
num_clusters = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1;
write_bytes = 0;
while (count > 0) {
clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
clu = last_clu = fid->start_clu;
if (fid->flags == 0x03) {
if ((clu_offset > 0) && (clu != CLUSTER_32(~0))) {
last_clu += clu_offset - 1;
if (clu_offset == num_clusters)
clu = CLUSTER_32(~0);
else
clu += clu_offset;
}
} else {
if ((clu_offset > 0) && (fid->hint_last_off > 0) &&
(clu_offset >= fid->hint_last_off)) {
clu_offset -= fid->hint_last_off;
clu = fid->hint_last_clu;
}
while ((clu_offset > 0) && (clu != CLUSTER_32(~0))) {
last_clu = clu;
if (FAT_read(sb, clu, &clu) == -1)
return FFS_MEDIAERR;
clu_offset--;
}
}
if (clu == CLUSTER_32(~0)) {
num_alloc = (s32)((count-1) >> p_fs->cluster_size_bits) + 1;
new_clu.dir = (last_clu == CLUSTER_32(~0)) ? CLUSTER_32(~0) : last_clu+1;
new_clu.size = 0;
new_clu.flags = fid->flags;
num_alloced = p_fs->fs_func->alloc_cluster(sb, num_alloc, &new_clu);
if (num_alloced == 0)
break;
else if (num_alloced < 0)
return FFS_MEDIAERR;
if (last_clu == CLUSTER_32(~0)) {
if (new_clu.flags == 0x01)
fid->flags = 0x01;
fid->start_clu = new_clu.dir;
modified = TRUE;
} else {
if (new_clu.flags != fid->flags) {
exfat_chain_cont_cluster(sb, fid->start_clu, num_clusters);
fid->flags = 0x01;
modified = TRUE;
}
if (new_clu.flags == 0x01)
FAT_write(sb, last_clu, new_clu.dir);
}
num_clusters += num_alloced;
clu = new_clu.dir;
}
fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits);
fid->hint_last_clu = clu;
offset = (s32)(fid->rwoffset & (p_fs->cluster_size-1));
sec_offset = offset >> p_bd->sector_size_bits;
offset &= p_bd->sector_size_mask;
LogSector = START_SECTOR(clu) + sec_offset;
oneblkwrite = (u64)(p_bd->sector_size - offset);
if (oneblkwrite > count)
oneblkwrite = count;
if ((offset == 0) && (oneblkwrite == p_bd->sector_size)) {
if (sector_read(sb, LogSector, &tmp_bh, 0) != FFS_SUCCESS)
goto err_out;
MEMCPY(((s8 *) tmp_bh->b_data), ((s8 *) buffer)+write_bytes, (s32) oneblkwrite);
if (sector_write(sb, LogSector, tmp_bh, 0) != FFS_SUCCESS) {
brelse(tmp_bh);
goto err_out;
}
} else {
if ((offset > 0) || ((fid->rwoffset+oneblkwrite) < fid->size)) {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
} else {
if (sector_read(sb, LogSector, &tmp_bh, 0) != FFS_SUCCESS)
goto err_out;
}
MEMCPY(((s8 *) tmp_bh->b_data)+offset, ((s8 *) buffer)+write_bytes, (s32) oneblkwrite);
if (sector_write(sb, LogSector, tmp_bh, 0) != FFS_SUCCESS) {
brelse(tmp_bh);
goto err_out;
}
}
count -= oneblkwrite;
write_bytes += oneblkwrite;
fid->rwoffset += oneblkwrite;
fid->attr |= ATTR_ARCHIVE;
if (fid->size < fid->rwoffset) {
fid->size = fid->rwoffset;
modified = TRUE;
}
}
brelse(tmp_bh);
if (p_fs->vol_type == EXFAT) {
es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep);
if (es == NULL)
goto err_out;
ep2 = ep+1;
} else {
ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or);
if (!ep)
goto err_out;
ep2 = ep;
}
p_fs->fs_func->set_entry_time(ep, tm_current(&tm, tz_utc), TM_MODIFY);
p_fs->fs_func->set_entry_attr(ep, fid->attr);
if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector);
if (modified) {
if (p_fs->fs_func->get_entry_flag(ep2) != fid->flags)
p_fs->fs_func->set_entry_flag(ep2, fid->flags);
if (p_fs->fs_func->get_entry_size(ep2) != fid->size)
p_fs->fs_func->set_entry_size(ep2, fid->size);
if (p_fs->fs_func->get_entry_clu0(ep2) != fid->start_clu)
p_fs->fs_func->set_entry_clu0(ep2, fid->start_clu);
if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector);
}
if (p_fs->vol_type == EXFAT) {
update_dir_checksum_with_entry_set(sb, es);
release_entry_set(es);
}
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
err_out:
if (wcount != NULL)
*wcount = write_bytes;
if (num_alloced == 0)
return FFS_FULL;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
}
s32 ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size)
{
s32 num_clusters;
u32 last_clu = CLUSTER_32(0);
sector_t sector = 0;
CHAIN_T clu;
TIMESTAMP_T tm;
DENTRY_T *ep, *ep2;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
FILE_ID_T *fid = &(EXFAT_I(inode)->fid);
ENTRY_SET_CACHE_T *es=NULL;
u8 tz_utc = EXFAT_SB(sb)->options.tz_utc;
if (fid->type != TYPE_FILE)
return FFS_PERMISSIONERR;
if (fid->size != old_size) {
printk(KERN_ERR "[EXFAT] truncate : can't skip it because of "
"size-mismatch(old:%lld->fid:%lld).\n"
,old_size, fid->size);
}
if (old_size <= new_size)
return FFS_SUCCESS;
fs_set_vol_flags(sb, VOL_DIRTY);
clu.dir = fid->start_clu;
clu.size = (s32)((old_size-1) >> p_fs->cluster_size_bits) + 1;
clu.flags = fid->flags;
if (new_size > 0) {
num_clusters = (s32)((new_size-1) >> p_fs->cluster_size_bits) + 1;
if (clu.flags == 0x03) {
clu.dir += num_clusters;
} else {
while (num_clusters > 0) {
last_clu = clu.dir;
if (FAT_read(sb, clu.dir, &(clu.dir)) == -1)
return FFS_MEDIAERR;
num_clusters--;
}
}
clu.size -= num_clusters;
}
fid->size = new_size;
fid->attr |= ATTR_ARCHIVE;
if (new_size == 0) {
fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
fid->start_clu = CLUSTER_32(~0);
}
if (fid->dir.dir != DIR_DELETED) {
if (p_fs->vol_type == EXFAT) {
es = get_entry_set_in_dir(sb, &(fid->dir), fid->entry, ES_ALL_ENTRIES, &ep);
if (es == NULL)
return FFS_MEDIAERR;
ep2 = ep+1;
} else {
ep = get_entry_in_dir(sb, &(fid->dir), fid->entry, §or);
if (!ep)
return FFS_MEDIAERR;
ep2 = ep;
}
p_fs->fs_func->set_entry_time(ep, tm_current(&tm, tz_utc), TM_MODIFY);
p_fs->fs_func->set_entry_attr(ep, fid->attr);
p_fs->fs_func->set_entry_size(ep2, new_size);
if (new_size == 0) {
p_fs->fs_func->set_entry_flag(ep2, 0x01);
p_fs->fs_func->set_entry_clu0(ep2, CLUSTER_32(0));
}
if (p_fs->vol_type != EXFAT)
buf_modify(sb, sector);
else {
update_dir_checksum_with_entry_set(sb, es);
release_entry_set(es);
}
}
if (last_clu != CLUSTER_32(0)) {
if (fid->flags == 0x01)
FAT_write(sb, last_clu, CLUSTER_32(~0));
}
p_fs->fs_func->free_cluster(sb, &clu, 0);
fid->hint_last_off = -1;
if (fid->rwoffset > fid->size) {
fid->rwoffset = fid->size;
}
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
}
static void update_parent_info( FILE_ID_T *fid, struct inode *parent_inode)
{
FS_INFO_T *p_fs = &(EXFAT_SB(parent_inode->i_sb)->fs_info);
FILE_ID_T *parent_fid = &(EXFAT_I(parent_inode)->fid);
if (unlikely((parent_fid->flags != fid->dir.flags)
|| (parent_fid->size != (fid->dir.size<<p_fs->cluster_size_bits))
|| (parent_fid->start_clu != fid->dir.dir))) {
fid->dir.dir = parent_fid->start_clu;
fid->dir.flags = parent_fid->flags;
fid->dir.size = ((parent_fid->size + (p_fs->cluster_size-1))
>> p_fs->cluster_size_bits);
}
}
s32 ffsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry)
{
s32 ret;
s32 dentry;
CHAIN_T olddir, newdir;
CHAIN_T *p_dir=NULL;
UNI_NAME_T uni_name;
DENTRY_T *ep;
struct super_block *sb = old_parent_inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
u8 *new_path = (u8 *) new_dentry->d_name.name;
struct inode *new_inode = new_dentry->d_inode;
int num_entries;
FILE_ID_T *new_fid = NULL;
u32 new_entry_type = TYPE_UNUSED;
s32 new_entry=0;
if ((new_path == NULL) || (STRLEN(new_path) == 0))
return FFS_ERROR;
update_parent_info(fid, old_parent_inode);
olddir.dir = fid->dir.dir;
olddir.size = fid->dir.size;
olddir.flags = fid->dir.flags;
dentry = fid->entry;
if (p_fs->vol_type != EXFAT) {
if ((olddir.dir != p_fs->root_dir) && (dentry < 2))
return FFS_PERMISSIONERR;
}
ep = get_entry_in_dir(sb, &olddir, dentry, NULL);
if (!ep)
return FFS_MEDIAERR;
if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY)
return FFS_PERMISSIONERR;
if (new_inode) {
ret = FFS_MEDIAERR;
new_fid = &EXFAT_I(new_inode)->fid;
update_parent_info(new_fid, new_parent_inode);
p_dir = &(new_fid->dir);
new_entry = new_fid->entry;
ep = get_entry_in_dir(sb, p_dir, new_entry, NULL);
if (!ep)
goto out;
new_entry_type = p_fs->fs_func->get_entry_type(ep);
if (new_entry_type == TYPE_DIR) {
CHAIN_T new_clu;
new_clu.dir = new_fid->start_clu;
new_clu.size = (s32)((new_fid->size-1) >> p_fs->cluster_size_bits) + 1;
new_clu.flags = new_fid->flags;
if (!is_dir_empty(sb, &new_clu))
return FFS_FILEEXIST;
}
}
if (STRLEN(new_path) >= MAX_NAME_LENGTH)
return FFS_NAMETOOLONG;
ret = resolve_path(new_parent_inode, new_path, &newdir, &uni_name);
if (ret)
return ret;
fs_set_vol_flags(sb, VOL_DIRTY);
if (olddir.dir == newdir.dir)
ret = rename_file(new_parent_inode, &olddir, dentry, &uni_name, fid);
else
ret = move_file(new_parent_inode, &olddir, dentry, &newdir, &uni_name, fid);
if ((ret == FFS_SUCCESS) && new_inode) {
ep = get_entry_in_dir(sb, p_dir, new_entry, NULL);
if (!ep)
goto out;
num_entries = p_fs->fs_func->count_ext_entries(sb, p_dir, new_entry, ep);
if (num_entries < 0)
goto out;
p_fs->fs_func->delete_dir_entry(sb, p_dir, new_entry, 0, num_entries+1);
if (new_entry_type == TYPE_DIR) {
CHAIN_T new_clu_to_free;
new_clu_to_free.dir = new_fid->start_clu;
new_clu_to_free.size = (s32)((new_fid->size-1) >> p_fs->cluster_size_bits) + 1;
new_clu_to_free.flags = new_fid->flags;
p_fs->fs_func->free_cluster(sb, &new_clu_to_free, 1);
new_fid->size = 0;
new_fid->start_clu = CLUSTER_32(~0);
new_fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01;
}
new_fid->dir.dir = DIR_DELETED;
}
out:
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return ret;
}
s32 ffsRemoveFile(struct inode *inode, FILE_ID_T *fid)
{
s32 dentry;
CHAIN_T dir, clu_to_free;
DENTRY_T *ep;
struct super_block *sb = inode->i_sb;
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
dir.dir = fid->dir.dir;
dir.size = fid->dir.size;
dir.flags = fid->dir.flags;
dentry = fid->entry;
ep = get_entry_in_dir(sb, &dir, dentry, NULL);
if (!ep)
return FFS_MEDIAERR;
if (p_fs->fs_func->get_entry_attr(ep) & ATTR_READONLY)
return FFS_PERMISSIONERR;
fs_set_vol_flags(sb, VOL_DIRTY);
remove_file(inode, &dir, dentry);
clu_to_free.dir = fid->start_clu;
clu_to_free.size = (s32)((fid->size-1) >> p_fs->cluster_size_bits) + 1;
clu_to_free.flags = fid->flags;
p_fs->fs_func->free_cluster(sb, &clu_to_free, 0);
fid->size = 0;
fid->start_clu = CLUSTER_32(~0);
fid->flags = (p_fs->vol_type == EXFAT)? 0x03: 0x01;
fid->dir.dir = DIR_DELETED;
#if (DELAYED_SYNC == 0)
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;