/**
* @brief Create a file
*
* Help from FUSE:
*
* This is called for creation of all non-directory, non-symlink nodes.
* If the filesystem defines a create() method, then for regular files that will be called instead.
*
* @param path file path
* @param mode creation mode
* @param device device where the device will be created (contains both major and minor numbers)
* @return 0 on success and <0 on error
**/
static int my_mknod(const char *path, mode_t mode, dev_t device) {
char modebuf[10];
mode_string(mode, modebuf);
fprintf(stderr, "--->>>my_mknod: path %s, mode %s, major %d, minor %d\n", path, modebuf, (int)MAJOR(device), (int)MINOR(device));
// We check that the length of the file name is correct
if(strlen(path + 1) > myFileSystem.superBlock.maxLenFileName) {
return -ENAMETOOLONG;
}
// There exist an available inode
if(myFileSystem.numFreeNodes <= 0) {
return -ENOSPC;
}
// There is still space for a new file
if(myFileSystem.directory.numFiles >= MAX_FILES_PER_DIRECTORY) {
return -ENOSPC;
}
// The directory exists
if(findFileByName(&myFileSystem, (char *)path + 1) != -1)
return -EEXIST;
/// Update all the information in the backup file:
int idxNodoI, idxDir;
if((idxNodoI = findFreeNode(&myFileSystem)) == -1 || (idxDir = findFreeFile(&myFileSystem)) == -1) {
return -ENOSPC;
}
// Update root folder
myFileSystem.directory.files[idxDir].freeFile = false;
myFileSystem.directory.numFiles++;
strcpy(myFileSystem.directory.files[idxDir].fileName, path + 1);
myFileSystem.directory.files[idxDir].nodeIdx = idxNodoI;
myFileSystem.numFreeNodes--;
// Fill the fields of the new inode
if(myFileSystem.nodes[idxNodoI] == NULL)
myFileSystem.nodes[idxNodoI] = malloc(sizeof(NodeStruct));
myFileSystem.nodes[idxNodoI]->fileSize = 0;
myFileSystem.nodes[idxNodoI]->numBlocks = 0;
myFileSystem.nodes[idxNodoI]->modificationTime = time(NULL);
myFileSystem.nodes[idxNodoI]->freeNode = false;
reserveBlocksForNodes(&myFileSystem, myFileSystem.nodes[idxNodoI]->blocks, 0);
updateDirectory(&myFileSystem);
updateNode(&myFileSystem, idxNodoI, myFileSystem.nodes[idxNodoI]);
return 0;
}
void* my_alloc(size_t size)
{
/**********************************/
/* Hole einen Freispeicher Knoten */
/**********************************/
node* freeNode = findFreeNode(size);
if (freeNode == 0)
{
char* data = get_block_from_system();
if (data == 0) return 0; /* System out of memory */
freeNode = (node*)data;
freeNode->size = BLOCKSIZE - offset;
freeNode->left = 0;
freeNode->right = 0;
freeNode->next = 0;
}
else
removeFreeNode(freeNode);
/***********************************/
/* Belege Platz im freien Speicher */
/***********************************/
/* Schritt 1: Pruefe ob Speicher uebrig bleibt */
size_t leftover = freeNode->size - size;
node* nLeftover = 0;
if (leftover >= offset + ALLIGN)
{
/* Es ist noch Platz für mindestens 8 Byte
* erzeuge neuen Freispeicherknoten */
nLeftover = (node*)( ((char*)freeNode) + offset + size);
nLeftover->size = (int)leftover - offset;
nLeftover->left = 0;
nLeftover->right = 0;
insertFreeNode(nLeftover);
freeNode->size = (int) size;
}
/* Schritt 2: Freispeicherknoten
durch Belegtspeicherknoten ersetzen */
/* freeNode Pointer kann jetzt als Belegtspeicherpointer genutzt werden: */
freeNode->left = 0;
freeNode->right = 0;
insertToTree(freeNode, &allocTree);
/* Schritt 3: Neu belegten Speicher zurueckgeben */
return ((char*)freeNode)+offset;
}
int insertKey(char *key,int key_len,char *val,int val_len,int ttl)
{
long len_t=val_len;
int count=(val_len/BLOCK_SIZE)+1;
if(global_head->freeBlockNum<count||global_head->freeNodeNum==0)
return -1;
int already=findKey(key,key_len);
if(already!=-1)
removeKey(already);
int index=findFreeNode();
if(index==-1)
return -1;
int i;
int sum=0;
for (i = 0; i < count; ++i)
{
int t=findFreeBlock();
long ttt=len_t;
if(t==-1)
return -1;
(global_head->p[index])->block[i]=t;
if(ttt>BLOCK_SIZE)
ttt=BLOCK_SIZE;
memcpy(AT(t),val+sum,ttt);
//long tt=snprintf(AT(t),ttt+1,"%s",val+sum);
sum+=ttt;
len_t-=ttt;
setBlockUsed(t);
}
(global_head->p[index])->block[i]=-1;
global_head->freeBlockNum-=count;
global_head->usedBlockNum+=count;
global_head->freeNodeNum--;
global_head->usedNodeNum++;
global_head->p[index]->size=val_len;
global_head->p[index]->is_free=0;
global_head->p[index]->ttl=time(0)+ttl;
snprintf(global_head->p[index]->key,key_len+1,"%s",key);
global_head->p[index]->key_len=key_len;
for (i = 0; i < count; ++i)
{
setBlockUsed((global_head->p[index])->block[i]);
}
return 1;
}
