static void check_backup_boot(DOS_FS *fs, struct boot_sector *b, int lss)
{
struct boot_sector b2;
if (!fs->backupboot_start) {
printf( "There is no backup boot sector.\n" );
if (CF_LE_W(b->reserved) < 3) {
printf( "And there is no space for creating one!\n" );
return;
}
if (interactive)
printf( "1) Create one\n2) Do without a backup\n" );
else printf( " Auto-creating backup boot block.\n" );
if (!interactive || get_key("12","?") == '1') {
int bbs;
/* The usual place for the backup boot sector is sector 6. Choose
* that or the last reserved sector. */
if (CF_LE_W(b->reserved) >= 7 && CF_LE_W(b->info_sector) != 6)
bbs = 6;
else {
bbs = CF_LE_W(b->reserved) - 1;
if (bbs == CF_LE_W(b->info_sector))
--bbs; /* this is never 0, as we checked reserved >= 3! */
}
fs->backupboot_start = bbs*lss;
b->backup_boot = CT_LE_W(bbs);
fs_write(fs->backupboot_start,sizeof(*b),b);
fs_write((off_t)offsetof(struct boot_sector,backup_boot),
sizeof(b->backup_boot),&b->backup_boot);
printf( "Created backup of boot sector in sector %d\n", bbs );
return;
}
static int msdos_default_utf8_to_utf16(
rtems_dosfs_convert_control *super,
const uint8_t *src,
const size_t src_size,
uint16_t *dst,
size_t *dst_size
)
{
int eno = 0;
size_t bytes_to_copy = MIN( src_size, *dst_size / 2);
size_t i;
(void) super;
*dst_size = 2 * bytes_to_copy;
for ( i = 0; eno == 0 && i < bytes_to_copy; ++i ) {
uint16_t utf16_native = src[i];
if ( utf16_native <= 127 ) {
dst[i] = CT_LE_W( utf16_native );
} else {
eno = EINVAL;
}
}
return eno;
}
/* msdos_set_dir_wrt_time_and_date --
* Write last write date and time for a file to the disk (to corresponded
* 32bytes node)
*
* PARAMETERS:
* mt_entry - mount table entry
* fat_fd - fat-file descriptor
*
* RETURNS:
* RC_OK on success, or -1 if error occured (errno set apropriately).
*
*/
int
msdos_set_dir_wrt_time_and_date(
rtems_filesystem_mount_table_entry_t *mt_entry,
fat_file_fd_t *fat_fd
)
{
ssize_t ret1 = 0, ret2 = 0;
msdos_fs_info_t *fs_info = mt_entry->fs_info;
unsigned short time_val;
unsigned short date;
uint32_t sec = 0;
uint32_t byte = 0;
msdos_date_unix2dos(fat_fd->mtime, &time_val, &date);
/*
* calculate input for _fat_block_write: convert (cluster num, offset) to
* (sector num, new offset)
*/
sec = fat_cluster_num_to_sector_num(mt_entry, fat_fd->info_cln);
sec += (fat_fd->info_ofs >> fs_info->fat.vol.sec_log2);
/* byte points to start of 32bytes structure */
byte = fat_fd->info_ofs & (fs_info->fat.vol.bps - 1);
time_val = CT_LE_W(time_val);
ret1 = _fat_block_write(mt_entry, sec, byte + MSDOS_FILE_WTIME_OFFSET,
2, (char *)(&time_val));
date = CT_LE_W(date);
ret2 = _fat_block_write(mt_entry, sec, byte + MSDOS_FILE_WDATE_OFFSET,
2, (char *)(&date));
if ( (ret1 < 0) || (ret2 < 0) )
return -1;
return RC_OK;
}
/* msdos_set_first_cluster_num --
* Write number of first cluster of the file to the disk (to corresponded
* 32bytes slot)
*
* PARAMETERS:
* mt_entry - mount table entry
* fat_fd - fat-file descriptor
*
* RETURNS:
* RC_OK on success, or -1 if error occured
*
*/
int
msdos_set_first_cluster_num(
rtems_filesystem_mount_table_entry_t *mt_entry,
fat_file_fd_t *fat_fd
)
{
ssize_t ret1 = 0, ret2 = 0;
msdos_fs_info_t *fs_info = mt_entry->fs_info;
uint32_t new_cln = fat_fd->cln;
uint16_t le_cl_low = 0;
uint16_t le_cl_hi = 0;
uint32_t sec = 0;
uint32_t byte = 0;
/*
* calculate input for _fat_block_write: convert (cluster num, offset) to
* (sector num, new offset)
*/
sec = fat_cluster_num_to_sector_num(mt_entry, fat_fd->info_cln);
sec += (fat_fd->info_ofs >> fs_info->fat.vol.sec_log2);
/* byte from points to start of 32bytes structure */
byte = fat_fd->info_ofs & (fs_info->fat.vol.bps - 1);
le_cl_low = CT_LE_W((uint16_t )(new_cln & 0x0000FFFF));
ret1 = _fat_block_write(mt_entry, sec,
byte + MSDOS_FIRST_CLUSTER_LOW_OFFSET, 2,
(char *)(&le_cl_low));
le_cl_hi = CT_LE_W((uint16_t )((new_cln & 0xFFFF0000) >> 16));
ret2 = _fat_block_write(mt_entry, sec,
byte + MSDOS_FIRST_CLUSTER_HI_OFFSET, 2,
(char *)(&le_cl_hi));
if ( (ret1 < 0) || (ret2 < 0) )
return -1;
return RC_OK;
}
/* msdos_creat_node --
* Create a new node. Determine if the name is a long name. If long we to
* scan the directory to create a short entry.
*
*
* If a new node is file, FAT 32 Bytes Directory
* Entry Structure is initialized, free space is found in parent
* directory and structure is written to the disk. In case of directory,
* all above steps present and also new cluster is allocated for a
* new directory and dot and dotdot nodes are created in alloceted cluster.
*
* PARAMETERS:
* parent_loc - parent (directory we are going to create node in)
* type - new node type (file or directory)
* name - new node name
* mode - mode
* link_info - fs_info of existing node for a pseudo "hard-link"
* (see msdos_file.c, msdos_link for documentation)
*
* RETURNS:
* RC_OK on success, or -1 if error occured (errno set appropriately).
*
*/
int
msdos_creat_node(const rtems_filesystem_location_info_t *parent_loc,
fat_file_type_t type,
const char *name,
int name_len,
mode_t mode,
const fat_file_fd_t *link_fd)
{
int rc = RC_OK;
ssize_t ret = 0;
msdos_fs_info_t *fs_info = parent_loc->mt_entry->fs_info;
fat_file_fd_t *parent_fat_fd = parent_loc->node_access;
fat_file_fd_t *fat_fd = NULL;
time_t now;
uint16_t time_val = 0;
uint16_t date = 0;
fat_dir_pos_t dir_pos;
msdos_name_type_t name_type;
char short_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE];
char dot_dotdot[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2];
char link_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE];
uint32_t sec = 0;
uint32_t byte = 0;
fat_dir_pos_init(&dir_pos);
memset(short_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
memset(dot_dotdot, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2);
if (name_len > MSDOS_NAME_MAX_LFN_WITH_DOT) {
rtems_set_errno_and_return_minus_one(ENAMETOOLONG);
}
name_type = msdos_long_to_short (fs_info->converter,
name, name_len,
MSDOS_DIR_NAME(short_node),
MSDOS_NAME_MAX);
if (name_type == MSDOS_NAME_INVALID) {
rtems_set_errno_and_return_minus_one(EINVAL);
}
/* fill reserved field */
*MSDOS_DIR_NT_RES(short_node) = MSDOS_RES_NT_VALUE;
/* set up last write date and time */
now = time(NULL);
fat_file_set_ctime_mtime(parent_fat_fd, now);
msdos_date_unix2dos(now, &date, &time_val);
*MSDOS_DIR_CRT_TIME(short_node) = CT_LE_W(time_val);
*MSDOS_DIR_CRT_DATE(short_node) = CT_LE_W(date);
*MSDOS_DIR_WRITE_TIME(short_node) = CT_LE_W(time_val);
*MSDOS_DIR_WRITE_DATE(short_node) = CT_LE_W(date);
*MSDOS_DIR_LAST_ACCESS_DATE(short_node) = CT_LE_W(date);
/* initialize directory/file size */
*MSDOS_DIR_FILE_SIZE(short_node) = MSDOS_INIT_DIR_SIZE;
if (type == FAT_DIRECTORY) {
*MSDOS_DIR_ATTR(short_node) |= MSDOS_ATTR_DIRECTORY;
}
else if (type == FAT_HARD_LINK) {
/*
* when we establish a (temporary) hard link,
* we must copy some information from the original
* node to the newly created
*/
/*
* read the original directory entry
*/
sec = fat_cluster_num_to_sector_num(&fs_info->fat,
link_fd->dir_pos.sname.cln);
sec += (link_fd->dir_pos.sname.ofs >> fs_info->fat.vol.sec_log2);
byte = (link_fd->dir_pos.sname.ofs & (fs_info->fat.vol.bps - 1));
ret = _fat_block_read(&fs_info->fat,
sec, byte, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE,
link_node);
if (ret < 0) {
return -1;
}
/*
* copy various attributes
*/
*MSDOS_DIR_ATTR(short_node) =*MSDOS_DIR_ATTR(link_node);
*MSDOS_DIR_CRT_TIME_TENTH(short_node)=*MSDOS_DIR_CRT_TIME_TENTH(link_node);
*MSDOS_DIR_CRT_TIME(short_node) =*MSDOS_DIR_CRT_TIME(link_node);
*MSDOS_DIR_CRT_DATE(short_node) =*MSDOS_DIR_CRT_DATE(link_node);
/*
* copy/set "file size", "first cluster"
*/
*MSDOS_DIR_FILE_SIZE(short_node) =*MSDOS_DIR_FILE_SIZE(link_node);
*MSDOS_DIR_FIRST_CLUSTER_LOW(short_node) =
*MSDOS_DIR_FIRST_CLUSTER_LOW(link_node);
*MSDOS_DIR_FIRST_CLUSTER_HI(short_node) =
*MSDOS_DIR_FIRST_CLUSTER_HI(link_node);
/*
* set "archive bit" due to changes
*/
*MSDOS_DIR_ATTR(short_node) |= MSDOS_ATTR_ARCHIVE;
}
static int do_msdos_rename(struct inode *old_dir, char *old_name,
struct dentry *old_dentry,
struct inode *new_dir,char *new_name, struct dentry *new_dentry,
struct buffer_head *old_bh,
struct msdos_dir_entry *old_de, loff_t old_ino, int is_hid)
{
struct super_block *sb = old_dir->i_sb;
struct buffer_head *new_bh=NULL,*dotdot_bh=NULL;
struct msdos_dir_entry *new_de,*dotdot_de;
struct inode *old_inode,*new_inode;
loff_t new_ino,dotdot_ino;
int error;
int is_dir;
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
is_dir = S_ISDIR(old_inode->i_mode);
if (fat_scan(new_dir,new_name,&new_bh,&new_de,&new_ino)>=0 &&!new_inode)
goto degenerate_case;
if (is_dir) {
if (new_inode) {
error = fat_dir_empty(new_inode);
if (error)
goto out;
}
error = fat_scan(old_inode, MSDOS_DOTDOT, &dotdot_bh,
&dotdot_de, &dotdot_ino);
if (error < 0) {
printk(KERN_WARNING
"MSDOS: %s/%s, get dotdot failed, ret=%d\n",
old_dentry->d_parent->d_name.name,
old_dentry->d_name.name, error);
goto out;
}
}
if (!new_bh) {
error = msdos_add_entry(new_dir, new_name, &new_bh, &new_de,
&new_ino, is_dir, is_hid);
if (error)
goto out;
}
new_dir->i_version = ++event;
/* There we go */
if (new_inode)
fat_detach(new_inode);
old_de->name[0] = DELETED_FLAG;
fat_mark_buffer_dirty(sb, old_bh);
fat_detach(old_inode);
fat_attach(old_inode, new_ino);
if (is_hid)
MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
else
MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
mark_inode_dirty(old_inode);
old_dir->i_version = ++event;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(new_inode);
}
if (dotdot_bh) {
dotdot_de->start = CT_LE_W(MSDOS_I(new_dir)->i_logstart);
dotdot_de->starthi = CT_LE_W((MSDOS_I(new_dir)->i_logstart) >> 16);
fat_mark_buffer_dirty(sb, dotdot_bh);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
mark_inode_dirty(new_inode);
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
error = 0;
out:
fat_brelse(sb, new_bh);
fat_brelse(sb, dotdot_bh);
return error;
degenerate_case:
error = -EINVAL;
if (new_de!=old_de)
goto out;
if (is_hid)
MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
else
MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
mark_inode_dirty(old_inode);
old_dir->i_version = ++event;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
return 0;
}
static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
struct dentry *old_dentry,
struct inode *new_dir, unsigned char *new_name, struct dentry *new_dentry,
struct buffer_head *old_bh,
struct msdos_dir_entry *old_de, loff_t old_i_pos, int is_hid)
{
struct buffer_head *new_bh=NULL,*dotdot_bh=NULL;
struct msdos_dir_entry *new_de,*dotdot_de;
struct inode *old_inode,*new_inode;
loff_t new_i_pos, dotdot_i_pos;
int error;
int is_dir;
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
is_dir = S_ISDIR(old_inode->i_mode);
if (fat_scan(new_dir, new_name, &new_bh, &new_de, &new_i_pos) >= 0
&& !new_inode)
goto degenerate_case;
if (is_dir) {
if (new_inode) {
error = fat_dir_empty(new_inode);
if (error)
goto out;
}
if (fat_scan(old_inode, MSDOS_DOTDOT, &dotdot_bh,
&dotdot_de, &dotdot_i_pos) < 0) {
error = -EIO;
goto out;
}
}
if (!new_bh) {
error = msdos_add_entry(new_dir, new_name, &new_bh, &new_de,
&new_i_pos, is_dir, is_hid);
if (error)
goto out;
}
new_dir->i_version++;
/* There we go */
if (new_inode)
fat_detach(new_inode);
old_de->name[0] = DELETED_FLAG;
mark_buffer_dirty(old_bh);
fat_detach(old_inode);
fat_attach(old_inode, new_i_pos);
if (is_hid)
MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
else
MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
mark_inode_dirty(old_inode);
old_dir->i_version++;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(new_inode);
}
if (dotdot_bh) {
dotdot_de->start = CT_LE_W(MSDOS_I(new_dir)->i_logstart);
dotdot_de->starthi = CT_LE_W((MSDOS_I(new_dir)->i_logstart) >> 16);
mark_buffer_dirty(dotdot_bh);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
mark_inode_dirty(new_inode);
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
error = 0;
out:
brelse(new_bh);
brelse(dotdot_bh);
return error;
degenerate_case:
error = -EINVAL;
if (new_de!=old_de)
goto out;
if (is_hid)
MSDOS_I(old_inode)->i_attrs |= ATTR_HIDDEN;
else
MSDOS_I(old_inode)->i_attrs &= ~ATTR_HIDDEN;
mark_inode_dirty(old_inode);
old_dir->i_version++;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
return 0;
}