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exfat_core.c
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exfat_core.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.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat_core.c */
/* PURPOSE : exFAT File Manager */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#include <linux/version.h>
#include <linux/param.h>
#include <linux/log2.h>
#include "exfat_bitmap.h"
#include "exfat_config.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_core.h"
#include <linux/blkdev.h>
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
}
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
extern u8 uni_upcase[];
/*----------------------------------------------------------------------*/
/* Local Variable Definitions */
/*----------------------------------------------------------------------*/
static u8 name_buf[MAX_PATH_LENGTH * MAX_CHARSET_SIZE];
static char *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 ~ 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 */
};
/*======================================================================*/
/* Global Function Definitions */
/*======================================================================*/
/* ffsInit : roll back to the initial state of the file system */
s32 ffsInit(void)
{
s32 ret;
ret = bdev_init();
if (ret)
return ret;
ret = fs_init();
if (ret)
return ret;
return FFS_SUCCESS;
} /* end of ffsInit */
/* ffsShutdown : make free all memory-alloced global buffers */
s32 ffsShutdown(void)
{
s32 ret;
ret = fs_shutdown();
if (ret)
return ret;
ret = bdev_shutdown();
if (ret)
return ret;
return FFS_SUCCESS;
} /* end of ffsShutdown */
/* ffsMountVol : mount the file system volume */
s32 ffsMountVol(struct super_block *sb)
{
int i, ret;
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);
printk("[EXFAT] trying to mount...\n");
sm_init(&p_fs->v_sem);
p_fs->dev_ejected = FALSE;
/* open the block device */
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);
/* read Sector 0 */
if (sector_read(sb, 0, &tmp_bh, 1) != FFS_SUCCESS)
return FFS_MEDIAERR;
p_fs->PBR_sector = 0;
p_pbr = (PBR_SECTOR_T *) tmp_bh->b_data;
/* check the validity of PBR */
if (GET16_A(p_pbr->signature) != PBR_SIGNATURE) {
brelse(tmp_bh);
bdev_close(sb);
return FFS_FORMATERR;
}
/* fill fs_stuct */
for (i = 0; i < 53; i++)
if (p_pbr->bpb[i])
break;
if (i < 53) {
if (GET16(p_pbr->bpb+11)) /* num_fat_sectors */
ret = fat16_mount(sb, p_pbr);
else
ret = fat32_mount(sb, p_pbr);
} else {
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;
}
printk("[EXFAT] mounted successfully\n");
return FFS_SUCCESS;
} /* end of ffsMountVol */
/* ffsUmountVol : umount the file system volume */
s32 ffsUmountVol(struct super_block *sb)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
printk("[EXFAT] trying to unmount...\n");
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);
/* close the block device */
bdev_close(sb);
if (p_fs->dev_ejected) {
printk("[EXFAT] unmounted with media errors. "
"device's already ejected.\n");
return FFS_MEDIAERR;
}
printk("[EXFAT] unmounted successfully\n");
return FFS_SUCCESS;
} /* end of ffsUmountVol */
/* ffsGetVolInfo : get the information of a file system volume */
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; /* clu 0 & 1 */
info->UsedClusters = p_fs->used_clusters;
info->FreeClusters = info->NumClusters - info->UsedClusters;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsGetVolInfo */
/* ffsSyncVol : synchronize all file system volumes */
s32 ffsSyncVol(struct super_block *sb, s32 do_sync)
{
FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
/* synchronize the file system */
fs_sync(sb, do_sync);
fs_set_vol_flags(sb, VOL_CLEAN);
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsSyncVol */
/*----------------------------------------------------------------------*/
/* File Operation Functions */
/*----------------------------------------------------------------------*/
/* ffsLookupFile : lookup a file */
s32 ffsLookupFile(struct inode *inode, char *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);
DPRINTK("ffsLookupFile entered\n");
/* check the validity of directory name in the given pathname */
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;
/* search the file name for directories */
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;
DPRINTK("ffsLookupFile exited successfully\n");
return FFS_SUCCESS;
} /* end of ffsLookupFile */
/* ffsCreateFile : create a file */
s32 ffsCreateFile(struct inode *inode, char *path, u8 mode, FILE_ID_T *fid)
{
s32 ret/*, dentry*/;
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);
/* check the validity of directory name in the given pathname */
ret = resolve_path(inode, path, &dir, &uni_name);
if (ret)
return ret;
fs_set_vol_flags(sb, VOL_DIRTY);
/* create a new file */
ret = create_file(inode, &dir, &uni_name, mode, fid);
#ifdef CONFIG_EXFAT_DELAYED_SYNC
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return ret;
} /* end of ffsCreateFile */
/* ffsReadFile : read data from a opened file */
s32 ffsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount)
{
s32 offset, sec_offset, clu_offset;
u32 clu, 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);
/* check if the given file ID is opened */
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 {
/* hint information */
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 = FAT_read(sb, clu); */
if (FAT_read(sb, clu, &clu) == -1)
return FFS_MEDIAERR;
clu_offset--;
}
}
/* hint information */
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)); /* byte offset in cluster */
sec_offset = offset >> p_bd->sector_size_bits; /* sector offset in cluster */
offset &= p_bd->sector_size_mask; /* byte offset in sector */
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(((char *) buffer)+read_bytes, ((char *) tmp_bh->b_data), (s32) oneblkread);
} else {
if (sector_read(sb, LogSector, &tmp_bh, 1) != FFS_SUCCESS)
goto err_out;
memcpy(((char *) buffer)+read_bytes, ((char *) tmp_bh->b_data)+offset, (s32) oneblkread);
}
count -= oneblkread;
read_bytes += oneblkread;
fid->rwoffset += oneblkread;
}
brelse(tmp_bh);
err_out:
/* set the size of read bytes */
if (rcount != NULL)
*rcount = read_bytes;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsReadFile */
/* ffsWriteFile : write data into a opened file */
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, 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);
/* check if the given file ID is opened */
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 {
/* hint information */
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;
/* clu = FAT_read(sb, 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;
/* (1) allocate a chain of clusters */
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;
/* (2) append to the FAT chain */
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;
}
/* hint information */
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)); /* byte offset in cluster */
sec_offset = offset >> p_bd->sector_size_bits; /* sector offset in cluster */
offset &= p_bd->sector_size_mask; /* byte offset in sector */
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(((char *) tmp_bh->b_data), ((char *) 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(((char *) tmp_bh->b_data)+offset, ((char *) 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);
/* (3) update the direcoty entry */
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), 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);
}
#ifdef CONFIG_EXFAT_DELAYED_SYNC
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
err_out:
/* set the size of written bytes */
if (wcount != NULL)
*wcount = write_bytes;
if (num_alloced == 0)
return FFS_FULL;
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsWriteFile */
/* ffsTruncateFile : resize the file length */
s32 ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size)
{
s32 num_clusters;
u32 last_clu = CLUSTER_32(0), 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;
/* check if the given file ID is opened */
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);
}
/* (1) update the directory entry */
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), 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);
}
/* (2) cut off from the FAT chain */
if (last_clu != CLUSTER_32(0)) {
if (fid->flags == 0x01)
FAT_write(sb, last_clu, CLUSTER_32(~0));
}
/* (3) free the clusters */
p_fs->fs_func->free_cluster(sb, &clu, 0);
/* hint information */
fid->hint_last_off = -1;
if (fid->rwoffset > fid->size)
fid->rwoffset = fid->size;
#ifdef CONFIG_EXFAT_DELAYED_SYNC
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return FFS_SUCCESS;
} /* end of ffsTruncateFile */
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);
}
}
/* ffsMoveFile : move(rename) a old file into a new file */
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;
s32 new_entry = 0;
/* check the validity of pointer parameters */
if ((new_path == NULL) || (*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;
/* check if the old file is "." or ".." */
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;
/* check whether new dir is existing directory and empty */
if (new_inode) {
u32 entry_type;
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;
entry_type = p_fs->fs_func->get_entry_type(ep);
if (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;
}
}
/* check the validity of directory name in the given new pathname */
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) {
/* delete entries of new_dir */
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);
}
out:
#ifdef CONFIG_EXFAT_DELAYED_SYNC
fs_sync(sb, 0);
fs_set_vol_flags(sb, VOL_CLEAN);
#endif
if (p_fs->dev_ejected)
return FFS_MEDIAERR;
return ret;
} /* end of ffsMoveFile */
/* ffsRemoveFile : remove a file */
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);
/* (1) update the directory entry */
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;
/* (2) free the clusters */
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;
#ifdef CONFIG_EXFAT_DELAYED_SYNC