int tfs_mkdir(struct inode *parent_dir, const char *dname)
{
struct inode *dir;
int dirty;
int err = 0;
dir = tfs_mknod(parent_dir, dname, TFS_DIR);
if (IS_ERR(dir)) {
free_inode(parent_dir);
return PTR_ERR(dir);
}
err = tfs_add_entry(dir, ".", dir->i_ino, &dirty);
if (err)
goto out;
err = tfs_add_entry(dir, "..", parent_dir->i_ino, &dirty);
if (err < 0)
goto out;
if (dirty)
err = tfs_iwrite(dir);
out:
free_inode(dir);
free_inode(parent_dir);
return err;
}
/*
* Looking for an inode with the given path
*
* returns NULL for -ENOENT, ERROR for errors happend
* and inode for finding responding file or directory.
*/
struct inode * namei(const char *name, uint32_t flag)
{
struct inode *inode;
struct inode *parent;
char part[256];
char *p;
FS_DEBUG("trying to open path: %s\n", name);
if (*name == '/') {
inode = root_fs()->root;
if (IS_ERR(inode))
panic("namei: Read root inode error!\n");
while (*name == '/')
name++;
} else {
inode = root_fs()->pwd;
FS_DEBUG("pwd->inode: %d\n", inode->i_ino);
}
parent = inode;
while (*name) {
p = part;
while (*name && *name != '/') {
if (p >= part + MAX_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
*p++ = *name++;
}
*p = '\0';
while (*name && *name == '/')
name++;
if (!*name && (flag & LOOKUP_PARENT))
return parent;
FS_DEBUG("Looking for part: %s, parent->inode: %d\n", part, parent->i_ino);
inode = iget(part, parent);
if (IS_ERR_OR_NULL(inode))
break;
free_inode(parent);
parent = inode;
if (!*name)
break;
}
if (PTR_ERR(inode) == -ENOENT && flag & LOOKUP_CREATE) {
inode = parent->i_op->mknod(parent, part, TFS_FILE);
free_inode(parent);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (inode->i_op->iwrite(inode)) {
free_inode(inode);
return ERR_PTR(-EIO);
}
}
return inode;
}
/*递归删除文件夹*/
int del_file(int inode, char* name, int deepth)
{
int child, i, t;
Inode temp;
if (!strcmp(name, ".") || !strcmp(name, "..")) {
/*不允许删除.和..*/
printf("rmdir: failed to remove '%s': Invalid argument\n", name);
return -1;
}
child = check_name(inode, name);
/*读取当前子目录的Inode结构*/
fseek(Disk, InodeBeg + sizeof(Inode)*child, SEEK_SET);
fread(&temp, sizeof(Inode), 1, Disk);
if (temp.type == File) {
/*如果是文件则释放相应Inode即可*/
free_inode(child);
/*若是最上层文件，需调整目录*/
if (deepth == 0) {
adjust_dir(name);
}
return 1;
}
else {
/*否则进入子目录*/
enter_child_dir(inode, name);
}
for (i = 2; i<dir_num; ++i) {
del_file(child, dir_table[i].name, deepth + 1);
}
enter_child_dir(child, "..");//返回上层目录
free_inode(child);
if (deepth == 0) {
/*删除自身在目录中的内容*/
if (dir_num / DirPerBlk != (dir_num - 1) / DirPerBlk) {
/*有磁盘块可以释放*/
curr_inode.blk_num--;
t = curr_inode.blk_identifier[curr_inode.blk_num];
free_blk(t);//释放相应的磁盘块
}
adjust_dir(name);//因为可能在非末尾处删除，因此要移动dir_table的内容
}/*非初始目录直接释放Inode*/
return 1;
}
struct fs_Inode* fs_inode_open(size_t inode) {
for (size_t i = 0; i < MAX_OPEN_INODES; i++) {
if (inodeTable[i]) {
if (inodeTable[i]->refCount <= 0) {
kprintf("Inode %u in entry %u is broken.\n", inodeTable[i]->number, i);
while (1);
}
}
}
for (size_t i = 0; i < MAX_OPEN_INODES; i++) {
if (inodeTable[i] != NULL && inodeTable[i]->number == inode) {
inodeTable[i]->refCount++;
return inodeTable[i];
}
}
struct fs_Inode* node = ext2_read_inode(fs, inode);
node->extra = NULL;
if (node == NULL) {
return NULL;
}
node->refCount = 1;
for (size_t i = 0; i < MAX_OPEN_INODES; i++) {
if (inodeTable[i] == NULL) {
inodeTable[i] = node;
return node;
}
}
free_inode(node);
return NULL;
}
void initiate_inode_list() {
int arr[512];
memset(arr,0 ,sizeof(arr));
int i;
uint max_inode_block = 1 + curr_superblock.isize;
for(i = 2; i <= max_inode_block; i++)
write_block(i, arr, sizeof(arr));
//int brr[512];
//read_block(20,brr,512);
uint inode_number = curr_superblock.isize * INODES_PER_BLOCK;
for(i = 2; i <= inode_number; i++) {
if(curr_superblock.ninode == MAX_SIZE)
break;
struct inode ino;
read_inode(i, &ino);
if(check_allocation(&ino) != 1) {
free_inode(i);
}
}
if(curr_superblock.ninode == 0){
fprintf(stderr,"Error: the inode blocks are full, allocation falure!");
exit(-1);
}
}
/*将 rmfile 这个文件删除，而且目前只能删除文件*/
void do_rm()
{
struct inode cur_dir,item;
struct dir_ent ent,emptyent;
char *filename;
char buf[MAXBUF];
memset(&emptyent,0,sizeof(emptyent));
int i,j;
if (!rmfile[0]) scanf("%s",rmfile);
if(!strcmp(rmfile,".") || !strcmp(rmfile,"..")) {
printf("Can not remove this file.\n");
_clear(rmfile);
return ;
}
strcpy(buf,rmfile);
j=-1;
for(i=0;rmfile[i];i++) if(rmfile[i]=='/') j=i;
if(j==0){// case /dir
buf[1]='\0';
filename=rmfile+1;
}else if(j>0){ //case /dir1/dir2 or ab/cd
buf[j]='\0';
filename=rmfile+j+1;
}else { //case ab
strcpy(buf,".");
filename=rmfile;
}
get_inode_bypath(buf,&cur_dir);
if(cur_dir.i_num==-1) {
printf("No such file.\n");
_clear(rmfile);
return ;
}
// get_inode(pwd,&cur_dir);
fseek(fimg,cur_dir.i_start_sect*SECTOR_SIZE,SEEK_SET);
//将逐个清空rmfile所占用的扇区
for(i=0;i<cur_dir.i_size;i++)
{
fread(&ent,sizeof(struct dir_ent),1,fimg);
if(strcmp(filename,ent.name)==0){
get_inode(ent.i_num,&item);
if(item.i_mode==1){
fseek(fimg,-sizeof(struct dir_ent),SEEK_CUR);
fwrite(&emptyent,sizeof(struct dir_ent),1,fimg);//删除该目录项,只能删除文件
free_inode(item.i_num);
u32 sector=item.i_start_sect;
while(sector!=0){
free_sector(sector);
fseek(fimg,sector*SECTOR_SIZE+SECTOR_SIZE-sizeof(u32),SEEK_SET);
fread(§or,sizeof(u32),1,fimg);
}
}else printf("Can not remove directory\n");
_clear(rmfile);
return ;
}
}
_clear(rmfile);
printf("No such file.\n");
}
void free_socket(struct inode *inode)
{
struct pxe_pvt_inode *socket = PVT(inode);
free(socket->tftp_pktbuf); /* If we allocated a buffer, free it now */
free_inode(inode);
}
void tfs_close(struct file *file)
{
if (file) {
free_inode(file->inode);
free(file);
}
}
void tfs_closedir(DIR *dir)
{
if (dir) {
free_inode(dir->dd_dir->inode);
free(dir->dd_dir);
free(dir);
}
}
static int dentry_remove(uint8_t *fs, int dir_inum, int target_inum) {
struct ext2_inode *dir = get_inode(fs, dir_inum);
void *block = get_block(fs, dir->i_block[0]);
ssize_t blocksize = get_block_size(fs);
// find target dentry
struct ext2_dir_entry_2 *dentry = (struct ext2_dir_entry_2 *)block;
struct ext2_dir_entry_2 *target = NULL;
struct ext2_dir_entry_2 *prev = NULL;
int count = 0;
blocksize -= dentry-> rec_len;
while (blocksize > 0) {
prev = dentry;
dentry = (struct ext2_dir_entry_2*)((uint8_t*)dentry + dentry->rec_len);
blocksize -= dentry->rec_len;
//DEBUG("Dir Remove: dentry %p, inode %d, length %d, lenex %d, cursize %d", dentry, dentry->inode, dentry->rec_len, ext2_dentry_find_len(dentry), blocksize);
if (dentry->inode == target_inum) {
target = dentry;
//DEBUG("Dir Remove: Found dentry");
}
}
if (blocksize) {
//ERROR("DIR REMOVE FILE: rec_len values not aligned %d", blocksize);
}
int is_target_end = 0;
if (target == dentry) {
is_target_end = 1;
//DEBUG("DIR REMOVE: End target");
}
//DEBUG("Dir Remove: size %d", blocksize);
if (target == NULL) {
ERROR("Dir Remove: Did not find dentry!");
return 0;
}
size_t dir_size = (uint64_t)dentry - (uint64_t)block + ext2_dentry_find_len(dentry);
//DEBUG("Dir Remove: last reclen %d", ext2_dentry_find_len(dentry));
//DEBUG("Dir Remove: dir_size %d, %x", dir_size, dir_size);
if (is_target_end) {
prev->rec_len += target->rec_len;
}
else {
// move remaining dentries back
dentry->rec_len += target->rec_len;
void *move_dst = (void*)((uint8_t*)target);
void *move_src = (void*)((uint8_t*)target + target->rec_len);
size_t move_len = (uint64_t)block + dir_size - (uint64_t)move_src;
//DEBUG("Dir Remove: move %p %p", move_dst, move_src);
//DEBUG("Dir Remove: move len %d", move_len);
memmove(move_dst, move_src, move_len);
}
// update terminator
dir_size -= target->rec_len;
dir->i_size -= dir_size;
free_inode(fs, target_inum);
return 1;
}
static void put_inode_itable( struct m_inode *inode )
{
struct buffer_head *bh = bread( inode->dev, inode->start_itable_sect, 0 );
struct d_inode *tmp = (struct d_inode *)(bh->pdata );
tmp = tmp + (inode->start_itable_sect - inode->zone_first_inode_num)%8;
*tmp = *((struct d_inode *)inode);
free_inode( inode );
bwrite( bh );
}
int sys_chdir(const char *pathname)
{
struct inode * inode;
char *cwd;
while (*pathname && *pathname == '.' && *(pathname + 1) == '/')
pathname += 2;
/* If we are changing to current dir, then just do nothing */
if (*pathname == '.' && !*(pathname + 1))
return 0;
inode = namei(pathname, 0);
if (IS_ERR_OR_NULL(inode))
return inode ? PTR_ERR(inode) : -ENOENT;
if (!IS_DIR(inode)) {
free_inode(inode);
return -ENOTDIR;
}
free_inode(root_fs()->pwd);
root_fs()->pwd = inode;
cwd = root_fs()->cwd;
if (*pathname == '/') {
strcpy(cwd, pathname);
} else if (strcmp(pathname, "..") == 0) {
char *p = strrchr(cwd, '/');
/* At least we have a '/' char */
if (!p)
return -EINVAL;
if (p == cwd)
*(p + 1) = '\0';
else
*p = '\0';
} else {
strcat(cwd, pathname);
}
return 0;
}
int tfs_rmdir(struct inode *dir, const char *dname)
{
struct inode *inode;
struct cache_struct *cs;
struct tfs_dir_entry *de;
struct tfs_sb_info *sbi = TFS_SBI(dir->i_fs);
int err;
cs = tfs_find_entry(dir, dname, &de);
if (IS_ERR_OR_NULL(cs)) {
err = cs ? PTR_ERR(cs) : -ENOENT;
goto out;
}
inode = tfs_iget_by_inr(dir->i_fs, de->d_inode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out;
}
if (inode->i_mode != TFS_DIR) {
err = -ENOTDIR;
goto error;
}
err = is_empty_dir(inode);
if (err == 0) {
err = -ENOTEMPTY;
goto error;
} else if (err == -1) {
printk("%s: path correupted: the size is less than two direntry!\n", dname);
err = -EINVAL;
goto error;
}
dir->i_size -= sizeof(struct tfs_dir_entry);
err = tfs_iwrite(dir);
if (err)
goto error;
de->d_inode = 0;
err = tfs_bwrite(sbi, cs->block, cs->data);
if (err)
goto error;
err = tfs_release_inode(sbi, inode);
goto out;
error:
free_inode(inode);
out:
return err;
}
int ext2_rmdir(inode_t *dir, dentry_t *dentry) {
if (S_ISDIR(dentry->d_inode->i_mode)) {
remove_dir_entry((ext2_fs_instance_t*)dir->i_instance, dir->i_ino, dentry->d_name);
free_inode((ext2_fs_instance_t*)dir->i_instance, dentry->d_inode->i_ino);
return 0;
} else {
return -ENOTDIR;
}
// TODO: Check is empty.
// TODO: Call rmdir_inode!
// décompter link!
}
void fs_inode_close(struct fs_Inode* inode) {
inode->refCount--;
if (inode->refCount == 0) {
for (size_t i = 0; i < MAX_OPEN_INODES; i++) {
if (inodeTable[i] == inode) {
free_inode(inode);
inodeTable[i] = NULL;
return;
}
}
}
}
/*
* Lookup the parent inode
*
* NOTE: the parent should be directory!
*/
struct inode *namei_parent(const char *pathname)
{
struct inode *dir = namei(pathname, LOOKUP_PARENT);
if (!IS_ERR_OR_NULL(dir))
return dir ? ERR_CAST(dir) : ERR_PTR(-ENOENT);
if (!IS_DIR(dir)) {
free_inode(dir);
return ERR_PTR(-ENOTDIR);
}
return dir;
}
/** Borra l'entrada de directori especificada y en cas de que sigui l'últim
* enllaç existent borra el propi fitxer/directori. Té control de concurrència.
* @path: ruta del fitxer/directori
* @return: 0 si correctament
* -1 en cas d'error.
*/
int emofs_unlink(const char *path) {
int p_inode = 0;
int p_dir_inode = 0;
int p_entry = 0;
emofs_inode inode;
emofs_dir_entry *last_dir_entry;
if(!mutex){
emofs_sem_get(&mutex);
}
emofs_sem_wait(mutex);
if (emofs_find_entry(path, &p_dir_inode, &p_inode, &p_entry) == -1) {
puts("EmoFS_UnLink: El fitxer o directori font no existeix");
emofs_sem_signal(mutex);
return -1;
}
read_inode(p_dir_inode, &inode);
/* Borram entrada de directori */
if (inode.size > sizeof(emofs_dir_entry)) {
/* Hi ha més entrades posam l'última al lloc de la que volem
* borrar. */
read_file(p_dir_inode, (void *)&last_dir_entry, \
inode.size-sizeof(emofs_dir_entry), \
sizeof(emofs_dir_entry));
write_file(p_dir_inode, last_dir_entry, \
p_entry*sizeof(emofs_dir_entry), \
sizeof(emofs_dir_entry));
}
free(last_dir_entry);
/* Truncam per l'ultima entrada, si sols hi ha la que volem borrar be
* sino llevam l'ultima que ara estara copiada al lloc de la que voliem
* borrar. */
truncate_file(p_dir_inode, inode.size-sizeof(emofs_dir_entry));
read_inode(p_inode, &inode);
if (inode.link_count == 0) {
/* Hem de alliberar blocs de dades i inode */
truncate_file(p_inode, 0);
free_inode(p_inode);
} else {
inode.link_count--;
write_inode(p_inode, &inode);
}
emofs_sem_signal(mutex);
return 0;
}
int sys_mkdir(const char *pathname)
{
int err;
struct inode *dir = namei_parent(pathname);
if (IS_ERR(dir))
return PTR_ERR(dir);
err = -ENOSYS;
if (dir->i_op && dir->i_op->mkdir)
err = dir->i_op->mkdir(dir, get_base_name(pathname));
free_inode(dir);
return err;
}
int sys_dirstat(char *dir, unsigned num, char *namebuf, struct stat *statbuf)
{
if(!namebuf || !statbuf || !dir)
return -EINVAL;
struct inode *i = read_dir(dir, num);
if(!i)
return -ESRCH;
do_stat(i, statbuf);
strncpy(namebuf, i->name, 128);
if(i->dynamic)
{
rwlock_acquire(&i->rwl, RWL_WRITER);
free_inode(i, 0);
}
return 0;
}
int remove_file(struct inode *dir, const char *name){
/*判断目录是否有效*/
if(dir->ext2_inode.i_block[0] != UINT_MAX){
perror("inode_operations.c: remove_file error! current dir is a file!\n");
return -1;
}
/*判断名字是否有效*/
if(checkname(name) == -1){
perror("inode_operations.c: remove_file error! filename is illegal!\n");
return -1;
}
char buf[BLOCK_SIZE];
struct ext2_dir_entry_2 *pentry;
int dir_datablocks = dir->ext2_inode.i_blocks;/*数据块个数*/
int i = 1;
int j = 0;
int num = BLOCK_SIZE/sizeof(struct ext2_dir_entry_2);
while(i <= dir_datablocks){
/*取出目录节点中第i块逻辑块所在的物理块的数据，放入buf*/
get_block_data(dir->ext2_inode.i_block[i],buf);
pentry = (struct ext2_dir_entry_2 *)buf;
//printf("inode_operations.c: check : dir_datablocks: %d\n",i);
/*比较每一项*/
while(j<num){
//printf("inode_operations.c: check : entry: %d\n",j);
/*比较pentry->inode不为0的每一项*/
if(pentry->inode && !strcmp(pentry->name,name)){
if(free_inode(pentry->inode) == -1){
perror("节点释放失败!\n");
return -1;
};
/*清空该目录项*/
memset(pentry,'\0',sizeof(struct ext2_dir_entry_2));
/*写回磁盘，更新数据*/
write_block_data(dir->ext2_inode.i_block[i],buf);
return 1;
}
j++;
pentry++;
}
i++;
}
printf("no such file,please check your filename!\n");
return -1;
}
/**
* Reset a file. Free memory if possible.
*
* @param fd file descriptor
*/
void free_file(file_nr fd)
{
file *f = get_file(fd);
if (f != NULL){
if (f->f_count > 0) {
f->f_count--;
}
if (f->f_count == 0) {
f->f_desc = NIL_FILE;
free(f->f_name);
f->f_name = NULL;
if (f->f_inode->i_adr != ROOT_INODE_BLOCK)
free_inode(f->f_inode->i_num);
}
}
}
static int do_close(MESSAGE *message){
PROCESS *process=pid2process(message->source_pid);
int fd=message->fd;
if(process->file_descriptor[fd]!=NULL &&
process->file_descriptor[fd]->fd_inode!=NULL &&
process->file_descriptor[fd]->fd_inode->i_share_count>0
){
free_inode(process->file_descriptor[fd]->fd_inode);
free_fd(process->file_descriptor[fd]);
process->file_descriptor[fd]=NULL;
return 0;
}
else{
set_error_index(FILE_NOT_OPEN);
return -1;
}
}
int sys_dirstat_fd(int fd, unsigned num, char *namebuf, struct stat *statbuf)
{
if(!namebuf || !statbuf)
return -EINVAL;
struct file *f = get_file_pointer((task_t *)current_task, fd);
if(!f) return -EBADF;
struct inode *i = read_idir(f->inode, num);
fput((task_t *)current_task, fd, 0);
if(!i)
return -ESRCH;
do_stat(i, statbuf);
strncpy(namebuf, i->name, 128);
if(i->dynamic)
{
rwlock_acquire(&i->rwl, RWL_WRITER);
free_inode(i, 0);
}
return 0;
}
/*===========================================================================*
* fs_newnode *
*===========================================================================*/
int fs_newnode(message *fs_m_in, message *fs_m_out)
{
register int r = OK;
mode_t bits;
struct inode *rip;
dev_t dev;
caller_uid = (uid_t) fs_m_in->REQ_UID;
caller_gid = (gid_t) fs_m_in->REQ_GID;
bits = (mode_t) fs_m_in->REQ_MODE;
dev = (dev_t) fs_m_in->REQ_DEV;
/* Try to allocate the inode */
if( (rip = alloc_inode(dev, bits) ) == NULL) return(err_code);
switch (bits & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
rip->i_rdev = dev; /* Major/minor dev numbers */
break;
case S_IFIFO:
if ((get_block(dev, rip->i_num)) == NULL)
r = EIO;
break;
default:
r = EIO; /* Unsupported file type */
}
if (r != OK) {
free_inode(rip);
} else {
/* Fill in the fields of the response message */
fs_m_out->RES_INODE_NR = rip->i_num;
fs_m_out->RES_MODE = rip->i_mode;
fs_m_out->RES_FILE_SIZE_LO = rip->i_size;
fs_m_out->RES_UID = rip->i_uid;
fs_m_out->RES_GID = rip->i_gid;
fs_m_out->RES_DEV = dev;
}
return(r);
}
int tfs_unlink(struct inode *dir, const char *dname)
{
struct inode *inode;
struct cache_struct *cs;
struct tfs_dir_entry *de;
struct tfs_sb_info *sbi = TFS_SBI(dir->i_fs);
int err;
cs = tfs_find_entry(dir, dname, &de);
if (IS_ERR_OR_NULL(cs)) {
err = cs ? PTR_ERR(cs) : -ENOENT;
goto out;
}
inode = tfs_iget_by_inr(dir->i_fs, de->d_inode);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out;
}
if (inode->i_mode != TFS_FILE) {
printk("%s: not a file!\n", dname);
goto error;
}
dir->i_size -= sizeof(struct tfs_dir_entry);
err = tfs_iwrite(dir);
if (err)
goto error;
de->d_inode = 0;
err = tfs_bwrite(sbi, cs->block, cs->data);
if (err)
goto error;
err = tfs_release_inode(sbi, inode);
goto out;
error:
free_inode(inode);
out:
return err;
}
Cache_ent *
new_file()
{
Cache_ent * cp;
Inodenum inode;
/* Get an inode - it is locked when we get it. */
if ((inode = alloc_inode()) < 0)
return 0;
/* Get a cache slot */
if ((cp = alloc_cache_slot(inode)) == 0)
{
free_inode(inode,0,ANN_NEVER,SEND_CANWAIT); /* unlocks the inode */
return 0;
}
cp->c_flags |= NOTCOMMITTED;
cp->c_timeout = BS_CACHE_TIMEOUT;
return cp;
}
int main(void){
memset((char*)m_inodemap,'\0',1024);
memset((char*)m_blockmap,'\0',1024);
int inode_num;
int block_num;
int n;
int i;
get_superblock_data(&sb);
printf("super_block.s_free_blocks_count: %d\n",sb.s_free_blocks_count);
printf("super_block.s_free_inodes_count: %d\n",sb.s_free_inodes_count);
printf("super_block.s_wtime: %d\n",sb.s_wtime);
get_blockmap((char*)m_blockmap,1024);
get_inodemap((char*)m_inodemap,1024);
for(i=0;i<256;i++){
if(m_blockmap[i] == 0) continue;
printf("blockmap[%d]:%#X\n",i,m_blockmap[i]);
}
for(i=0;i<256;i++){
if(m_inodemap[i] == 0) continue;
printf("inodemap[%d]:%#X\n",i,m_inodemap[i]);
}
while(1){
printf("请输入您要选择的功能号（0-释放/1-申请/2-退出）:");
scanf("%d",&n);
if(n == 0){
printf("请输入需要释放的数据块号：");
scanf("%d",&block_num);
if(free_block(block_num) == -1){
perror("释放失败！\n");
exit(EXIT_FAILURE);
}
get_blockmap((char*)m_blockmap,1024);
printf("blockmap[0]:%#X\n",m_blockmap[0]);
printf("请输入需要释放的i节点号：");
scanf("%d",&inode_num);
if(free_inode(inode_num) == -1){
perror("释放失败！\n");
exit(EXIT_FAILURE);
}
get_inodemap((char*)m_inodemap,1024);
printf("inodemap[0]:%#X\n",m_inodemap[0]);
}
else if(n == 1){
/*申请一个空闲块*/
if((block_num=new_block()) == -1){
perror("申请失败！\n");
exit(EXIT_FAILURE);
}
printf("获得的空闲块号：%d\n",block_num);
get_blockmap((char*)m_blockmap,1024);
printf("blockmap[0]:%#X\n",m_blockmap[0]);
/*申请一个空闲i节点*/
if((inode_num=new_inode()) == -1){
perror("申请失败！\n");
exit(EXIT_FAILURE);
}
printf("获得的空闲i节点号：%d\n",inode_num);
get_inodemap((char*)m_inodemap,1024);
printf("inodemap[0]:%#X\n",m_inodemap[0]);
}
else{
break;
}
}
get_superblock_data(&sb);
printf("super_block.s_free_blocks_count: %d\n",sb.s_free_blocks_count);
printf("super_block.s_free_inodes_count: %d\n",sb.s_free_inodes_count);
printf("super_block.s_wtime: %d\n",sb.s_wtime);
for(i=0;i<256;i++){
if(m_blockmap[i] == 0) continue;
printf("blockmap[%d]:%#X\n",i,m_blockmap[i]);
}
for(i=0;i<256;i++){
if(m_inodemap[i] == 0) continue;
printf("inodemap[%d]:%#X\n",i,m_inodemap[i]);
}
return 0;
}
int ext2_unlink(inode_t *dir, dentry_t *dentry) {
remove_dir_entry((ext2_fs_instance_t*)dir->i_instance, dir->i_ino, dentry->d_name);
free_inode((ext2_fs_instance_t*)dir->i_instance, dentry->d_inode->i_ino);
// TODO: nlink--
return 0;
}
//handling create request
void create_handler(Msg *msg, int sender_pid)
{
char pathname[MAXPATHNAMELEN];
CopyFrom(sender_pid,pathname,msg->ptr1,msg->num1+1);
char* filename = pathname+msg->num1;
int direct_len = msg->num1;
while ((*filename)!='/' && filename!=pathname) {
filename--;
direct_len--;
}
if ((*filename)=='/') {
direct_len++;
filename++;
}
if (strlen(filename)==0) {
perror("invalid pathname when creating file==0!");
msg->type = ERROR;
return;
}
int direct_inum = path_to_inum(pathname,direct_len,msg->num2,0);
if (direct_inum<=0) {
perror("invalid pathname when creating file direct_num<0!");
msg->type = ERROR;
return;
}
int new_inum = check_dir(direct_inum,filename);
if (new_inum<0) {
perror("invalid pathname when creating file new_inum<0!");
msg->type = ERROR;
return;
}
//exist same file name in the directory
if (new_inum>0) {
inode_cache *n = read_inode(new_inum);
free_inode(n->inode_num);
msg->num1 = new_inum;
}
else if (new_inum==0) {
new_inum = alloc_inode(INODE_REGULAR,0);
struct dir_entry *d = empty_dir(direct_inum);
if (d==NULL) {
perror("no empty space for new directory");
msg->type = ERROR;
return;
}
d->inum = new_inum;
memcpy(d->name,filename,strlen(filename));
inode_cache *n = read_inode(direct_inum);
n->data.size += sizeof(struct dir_entry);
n->data.nlink++;
n->dirty = 1;
msg->num1 = new_inum;
n = read_inode(new_inum);
msg->num2 = n->data.reuse;
}
}
//handling unlink request
void unlink_handler(Msg *msg, int sender_pid)
{
char pathname[MAXPATHNAMELEN];
memset(pathname,'\0',MAXPATHNAMELEN);
CopyFrom(sender_pid,pathname,msg->ptr1,msg->num2+1);
int dir_len=msg->num2;
char *dir_pathname=pathname+msg->num2;
while((*dir_pathname)!='/'&&dir_pathname!=pathname){
dir_len--;
dir_pathname--;
}
if((*dir_pathname)=='/'){
dir_len++;
dir_pathname++;
}
int parent_inum=path_to_inum(pathname,dir_len,msg->num1,0);
int path_inum=check_dir(parent_inum,dir_pathname);
if(path_inum<=0||parent_inum<=0){
msg->type=-1;
return;
}
inode_cache *path_inode=read_inode(path_inum);
inode_cache *parent_inode=read_inode(parent_inum);
if(path_inode->data.type==INODE_DIRECTORY){
msg->type=-1;
return;
}
struct dir_entry *path_dir_entry=search_dir_entry(parent_inum,dir_pathname);
if(path_inode->data.nlink>1){
path_dir_entry->inum=0;
path_inode->data.nlink--;
memset(path_dir_entry->name,'\0',DIRNAMELEN);
parent_inode->data.size-=sizeof(struct dir_entry);
parent_inode->dirty=1;
}
else if(path_inode->data.nlink==1){
path_dir_entry->inum=0;
path_inode->data.nlink--;
memset(path_dir_entry->name,'\0',DIRNAMELEN);
free_inode(path_inum);//XXX
path_inode->dirty=1;
parent_inode->data.size-=sizeof(struct dir_entry);
parent_inode->dirty=1;
}
else{
msg->type=-1;
return;
}
}
