// Test that the block cache works, by smashing the superblock and
// reading it back.
static void
check_bc(void)
{
struct Super backup;
// back up super block
memmove(&backup, diskaddr(1), sizeof backup);
// smash it
strcpy(diskaddr(1), "OOPS!\n");
flush_block(diskaddr(1));
assert(va_is_mapped(diskaddr(1)));
assert(!va_is_dirty(diskaddr(1)));
// clear it out
sys_page_unmap(0, diskaddr(1));
assert(!va_is_mapped(diskaddr(1)));
// read it back in
assert(strcmp(diskaddr(1), "OOPS!\n") == 0);
// fix it
memmove(diskaddr(1), &backup, sizeof backup);
flush_block(diskaddr(1));
cprintf("block cache is good\n");
}
int file_data_write(struct File *f, char *buf, size_t count, int block_no)
{
int err;
int pblk, hash_addr;
int addr;
int hash_second_table_addr;
int second_table_offset;
int flag = 0;
uint32_t hash = generate_hash(buf, BLKSIZE);
int hash_first_table_addr = HashBlock_Start + (hash & HashLowBits);
fseek(fp,hash_first_table_addr,SEEK_SET);
fread(&addr, sizeof(int), 1, fp);
if(addr == 0)
{
if(alloc_block(&hash_addr) < 0)
{
printf("\n error in block allocation for write");
return -1;
}
fseek(fp,hash_first_table_addr,SEEK_SET);
fwrite(&hash_addr, sizeof(int), 1, fp);
flush_block(hash_addr);
if((err = file_get_block(f, block_no, &pblk)) < 0)
{
printf("\n error in getting block for write");
return -1;
}
flush_block(pblk);
fseek(fp,pblk,SEEK_SET);
fwrite(buf, count, 1, fp);
f->f_size += count;
f->f_written += count;
f->n_blocks += 1;
super->total_blocks+=1;
super->written_blocks+=1;
second_table_offset = (hash & HashHighBits) >> 25;
hash_second_table_addr = (int)((int *)hash_addr + second_table_offset);
fseek(fp,hash_second_table_addr,SEEK_SET);
fwrite(&pblk, sizeof(int), 1, fp);
}
else
{
// Set *blk to point at the filebno'th block in file 'f'.
// Allocate the block if it doesn't yet exist.
//
// Returns 0 on success, < 0 on error. Errors are:
// -E_NO_DISK if a block needed to be allocated but the disk is full.
// -E_INVAL if filebno is out of range.
//
// Hint: Use file_block_walk and alloc_block.
int
file_get_block(struct File *f, uint32_t filebno, char **blk)
{
// LAB 5: Your code here.
int r;
uint32_t *pblkno;
if ((r = file_block_walk(f, filebno, &pblkno, 1)) < 0){
return r;
}
// if not exist
if (*pblkno == 0){
if ((r = alloc_block()) < 0){
return -E_NO_DISK;
}
*pblkno = r;
// Clear this block
memset(diskaddr(r), 0, BLKSIZE);
// flush this empty block into disk
flush_block(diskaddr(r));
}
*blk = diskaddr(*pblkno);
return 0;
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
uint32_t i, j, blockno;
for (i = 0; i < BLKBITSIZE / 32; i++){
if ((bitmap[i] & 0xffffffff) != 0){
break;
}
}
if (i == BLKBITSIZE / 32){
return -E_NO_DISK;
}
blockno = i * 32;
for (j = 0; j < 32; j++){
if (bitmap[i] & (1<<j)){
break;
}
}
blockno += j;
bitmap[i] ^= (1<<j);
flush_block(bitmap);
return blockno;
}
static BLOCK *find_free_slot(FS *fs)
{
int attempts = 0, max = 3;
while (attempts < max)
{
BLOCK *ptr = fs->cache_tail;
attempts++;
while (ptr != NULL)
{
if (!(ptr->flags & F_CACHED)
|| (!(ptr->flags & F_DIRTY) && ptr->pins == 0))
{
flush_block(fs, ptr);
remove_block_from_hash(fs, ptr);
ptr->flags = 0;
set_flag(ptr, F_CACHED);
ptr->pins = 0;
return ptr;
}
ptr = ptr->prev;
}
flush_fs(fs);
}
error("No more free slots in cache -- increase size or find bug");
return NULL;
}
int
fs_mkdir(const char *path, mode_t mode)
{
struct inode *dir;
time_t curtime;
struct fuse_context *ctxt;
int r;
if ((r = inode_create(path, &dir)) < 0)
return r;
dir->i_size = 0;
dir->i_mode = S_IFDIR | (mode & 0777);
dir->i_nlink = 1;
curtime = time(NULL);
dir->i_atime = curtime;
dir->i_ctime = curtime;
dir->i_mtime = curtime;
ctxt = fuse_get_context();
dir->i_owner = ctxt->uid;
dir->i_group = ctxt->gid;
flush_block(dir);
return 0;
}
int
fs_mknod(const char *path, mode_t mode, dev_t rdev)
{
struct inode *ino;
time_t curtime;
struct fuse_context *ctxt;
int r;
if ((r = inode_create(path, &ino)) < 0)
return r;
ino->i_size = 0;
ino->i_mode = mode;
ino->i_nlink = 1;
ino->i_rdev = rdev;
curtime = time(NULL);
ino->i_atime = curtime;
ino->i_ctime = curtime;
ino->i_mtime = curtime;
ctxt = fuse_get_context();
ino->i_owner = ctxt->uid;
ino->i_group = ctxt->gid;
flush_block(ino);
return 0;
}
void TextMan::flush_lines(int l1, int l2) {
l1 *= CHAR_LINES;
l2 *= CHAR_LINES;
l2 += CHAR_LINES - 1;
flush_block(0, l1, GFX_WIDTH - 1, l2);
}
// Set *blk to point at the filebno'th block in file 'f'.
// Allocate the block if it doesn't yet exist.
//
// Returns 0 on success, < 0 on error. Errors are:
// -E_NO_DISK if a block needed to be allocated but the disk is full.
// -E_INVAL if filebno is out of range.
//
// Hint: Use file_block_walk and alloc_block.
int
file_get_block(struct File *f, uint32_t filebno, char **blk)
{
// LAB 5: Your code here.
//panic("file_get_block not implemented");
uint32_t *pdiskbno;
int result;
if((result=file_block_walk(f, filebno, &pdiskbno, 1)) < 0)
{
return result;
}
if(*pdiskbno == 0)
{
if((result=alloc_block()) < 0)
{
return -E_NO_DISK;
}
else
{
*pdiskbno=result;
memset(diskaddr(result), 0, BLKSIZE);
flush_block(diskaddr (result));
}
}
*blk=diskaddr(*pdiskbno);
return 0;
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
// LAB 5: Your code here.
//panic("alloc_block not implemented");
uint32_t blockno;
int flag;
flag=0;
for(blockno=0; blockno<super->s_nblocks; blockno++)
{
if(block_is_free(blockno))
{
bitmap[blockno/32] ^= 1<<(blockno%32);
flush_block(bitmap);
flag=1;
break;
}
}
if(flag == 1)
{
return blockno;
}
else
{
return -E_NO_DISK;
}
}
void pick_block(int16_t page) {
if (page == current_page) {
return;
}
if (current_page != -1) {
flush_block();
}
if (page >= pages_initialized) {
uint8_t buf[16];
for (int16_t i = 0; i < 16; ++i) {
buf[i] = 0xff;
}
for (int16_t i = 0; i < 512; i += 16) {
flash_buf_write(0, i, buf, 16);
}
for ( ; pages_initialized <= page; ) {
flash_put_buffer(0, pages_initialized);
pages_initialized++;
}
eeprom_write(EEP_MAXPAGE_L, (uint8_t)(pages_initialized & 0xff));
eeprom_write(EEP_MAXPAGE_H, (uint8_t)(pages_initialized >> 8));
putProg("Pages initialized: ");
putInt(pages_initialized);
putCRLF();
}
// Flush the contents and metadata of file f out to disk.
// Loop over all the blocks in file.
// Translate the file block number into a disk block number
// and then check whether that disk block is dirty. If so, write it out.
void
file_flush(struct File *f)
{
int i;
uint32_t *pdiskbno;
for (i = 0; i < (f->f_size + BLKSIZE - 1) / BLKSIZE; i++) {
if (file_block_walk(f, i, &pdiskbno, 0) < 0 ||
pdiskbno == NULL || *pdiskbno == 0)
continue;
flush_block(diskaddr(*pdiskbno));
}
flush_block(f);
if (f->f_indirect)
flush_block(diskaddr(f->f_indirect));
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
// code for lab 5 -M.G
// panic("alloc_block not implemented");
uint32_t i,j;
for (i = 0; i < super->s_nblocks/32; i++)
{
for (j = 0; j < 32; j++)
{
uint32_t mark_bit = (1 << j);
if (bitmap[i] & mark_bit)
{
bitmap[i] &= ~mark_bit;
flush_block(diskaddr((i * 32 | j)/BLKBITSIZE + 2));
return (i * 32) | j;
}
}
}
return -E_NO_DISK;
}
// Find the disk block number slot for the 'filebno'th block in file 'f'.
// Set '*ppdiskbno' to point to that slot.
// The slot will be one of the f->f_direct[] entries,
// or an entry in the indirect block.
// When 'alloc' is set, this function will allocate an indirect block
// if necessary.
//
// Returns:
// 0 on success (but note that *ppdiskbno might equal 0).
// -E_NOT_FOUND if the function needed to allocate an indirect block, but
// alloc was 0.
// -E_NO_DISK if there's no space on the disk for an indirect block.
// -E_INVAL if filebno is out of range (it's >= NDIRECT + NINDIRECT).
//
// Analogy: This is like pgdir_walk for files.
// Hint: Don't forget to clear any block you allocate.
static int
file_block_walk(struct File *f, uint32_t filebno, uint32_t **ppdiskbno, bool alloc)
{
// LAB 5: Your code here.
int r;
void *addr = NULL;
if (filebno >= NDIRECT + NINDIRECT){
return -E_INVAL;
}
if (filebno < NDIRECT){
*ppdiskbno = &f->f_direct[filebno];
return 0;
}
if (f->f_indirect == 0){
if (!alloc){
return -E_NOT_FOUND;
}
if((r = alloc_block()) == -E_NO_DISK){
return -E_NO_DISK;
}
f->f_indirect = r;
// Clear this indirect block
memset(diskaddr(r), 0, BLKSIZE);
flush_block(diskaddr(r));
}
// Remember fileno - NDIRECT
addr = diskaddr(f->f_indirect);
*ppdiskbno = ((uint32_t *)addr + filebno - NDIRECT);
return 0;
}
// Sync the entire file system. A big hammer.
void
fs_sync(void)
{
int i;
for (i = 1; i < super->s_nblocks; i++)
flush_block(diskaddr(i));
}
/* Called when there is no enough free memory. */
void flush_block_buffer(void)
{
struct block *block;
while (!list_empty(&block_buffer_list)) {
block = list_first_entry(&block_buffer_list, struct block, b_list);
flush_block(block);
free_block(block);
}
}
// Set the size of file f, truncating or extending as necessary.
int
file_set_size(struct File *f, off_t newsize)
{
if (f->f_size > newsize)
file_truncate_blocks(f, newsize);
f->f_size = newsize;
flush_block(f);
return 0;
}
void minix_sync_inode(struct inode *inode)
{
/* synchronize inode */
flush_block(i2mi(inode)->m_iblock);
/* synchronize dirty blocks */
inode_sync_dbc(inode);
/* free dirty blocks */
inode_free_dbc(inode);
}
// Test that the block cache works, by smashing the superblock and
// reading it back.
static void
check_bc(void)
{
cprintf("Starting..\n");
struct Super backup;
// back up super block
memmove(&backup, diskaddr(1), sizeof(backup));
BC_DEBUG("Wrote superblock to disk ram block..\n");
BC_DEBUG("in memory magic number: %08x\n", ((struct Super*)diskaddr(1))->s_magic);
// smash it
strcpy(diskaddr(1), "OOPS!\n");
flush_block(diskaddr(1));
assert(va_is_mapped(diskaddr(1)));
assert(!va_is_dirty(diskaddr(1)));
cprintf("Smashed disk superblock..\n");
// clear it out
sys_page_unmap(0, diskaddr(1));
assert(!va_is_mapped(diskaddr(1)));
cprintf("Unmapped superblock va..\n");
// read it back in
assert(strcmp(diskaddr(1), "OOPS!\n") == 0);
cprintf("re-read superblock va..\n");
// fix it
memmove(diskaddr(1), &backup, sizeof(backup));
assert(memcmp(diskaddr(1), &backup, sizeof(backup)) == 0);
flush_block(diskaddr(1));
assert(memcmp(diskaddr(1), &backup, sizeof(backup)) == 0);
BC_DEBUG("backup magic number : %08x\n", backup.s_magic);
BC_DEBUG("in memory magic number: %08x\n", ((struct Super*)diskaddr(1))->s_magic);
BC_DEBUG("expected magic value : %08x\n", FS_MAGIC);
cprintf("Fixed superblock..\n");
cprintf("block cache is good\n");
}
void sync_blocks(void)
{
struct hlist_head *head = block_htable;
int i = BLOCK_HASH_SIZE;
struct hlist_node *node;
struct block *block;
while (i > 0) {
hlist_for_each_entry(block, node, head, b_hnode)
flush_block(block);
head++;
i--;
}
}
int
fs_utimens(const char *path, const struct timespec tv[2])
{
struct inode *ino;
int r;
if ((r = inode_open(path, &ino)) < 0)
return r;
ino->i_atime = tv[0].tv_sec;
ino->i_mtime = tv[1].tv_sec;
ino->i_ctime = time(NULL);
flush_block(ino);
return 0;
}
int
fs_chmod(const char *path, mode_t mode)
{
struct inode *ino;
int r;
if ((r = inode_open(path, &ino)) < 0)
return r;
if (ino == diskaddr(super->s_root))
return -EPERM;
ino->i_mode = mode;
ino->i_ctime = time(NULL);
flush_block(ino);
return 0;
}
// Remove a file by truncating it and then zeroing the name.
int
file_remove(const char *path)
{
int r;
struct File *f;
if ((r = walk_path(path, 0, &f, 0)) < 0)
return r;
file_truncate_blocks(f, 0);
f->f_name[0] = '\0';
f->f_size = 0;
flush_block(f);
return 0;
}
// Find the disk block number slot for the 'filebno'th block in file 'f'.
// Set '*ppdiskbno' to point to that slot.
// The slot will be one of the f->f_direct[] entries,
// or an entry in the indirect block.
// When 'alloc' is set, this function will allocate an indirect block
// if necessary.
//
// Returns:
// 0 on success (but note that *ppdiskbno might equal 0).
// -E_NOT_FOUND if the function needed to allocate an indirect block, but
// alloc was 0.
// -E_NO_DISK if there's no space on the disk for an indirect block.
// -E_INVAL if filebno is out of range (it's >= NDIRECT + NINDIRECT).
//
// Analogy: This is like pgdir_walk for files.
// Hint: Don't forget to clear any block you allocate.
static int
file_block_walk(struct File *f, uint32_t filebno, uint32_t **ppdiskbno, bool alloc)
{
// LAB 5: Your code here.
//panic("file_block_walk not implemented");
int result;
if(filebno >= NDIRECT+NINDIRECT)
{
return -E_INVAL;
}
if(filebno < NDIRECT)
{
if(ppdiskbno)
{
*ppdiskbno=(f->f_direct+filebno);
}
return 0;
}
if(!f->f_indirect && !alloc)
{
return -E_NOT_FOUND;
}
if(!f->f_indirect)
{
if((result=alloc_block()) < 0)
{
return -E_NO_DISK;
}
f->f_indirect=result;
memset(diskaddr(result), 0, BLKSIZE);
flush_block(diskaddr(result));
}
if(ppdiskbno)
{
*ppdiskbno=(uint32_t *)diskaddr(f->f_indirect)+filebno-NDIRECT;
}
return 0;
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
// LAB 5: Your code here.
int i;
for (i = 0; i < super->s_nblocks; ++i)
if (block_is_free(i)) {
bitmap[i/32] &= (~(1<<(i%32)));
flush_block(&bitmap[i/32]);
return i;
}
return -E_NO_DISK;
}
int
fs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi)
{
struct inode *dir = (struct inode *)fi->fh;
struct dirent dent;
int r;
while ((r = inode_read(dir, &dent, sizeof(dent), offset)) > 0) {
offset += r;
if (dent.d_name[0] == '\0')
continue;
if (filler(buf, dent.d_name, NULL, offset) != 0)
return 0;
}
dir->i_atime = time(NULL);
flush_block(dir);
return 0;
}
int
fs_chown(const char *path, uid_t uid, gid_t gid)
{
struct inode *ino;
int r;
if ((r = inode_open(path, &ino)) < 0)
return r;
if (ino == diskaddr(super->s_root))
return -EPERM;
if (uid != -1)
ino->i_owner = uid;
if (gid != -1)
ino->i_group = gid;
ino->i_ctime = time(NULL);
flush_block(ino);
return 0;
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
// LAB 5: Your code here.
// panic("alloc_block not implemented");
int blkno;
for (blkno = 1; blkno < super->s_nblocks; blkno++) {
if (block_is_free(blkno)) {
bitmap[blkno/32] &= ~(1<<(blkno%32));
flush_block(&bitmap[blkno/32]);
return blkno;
}
}
return -E_NO_DISK;
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
// LAB 5: Your code here.
uint32_t blockno;
for(blockno = 1; blockno < super->s_nblocks; blockno++)
if(block_is_free(blockno))
{
bitmap[blockno/32] ^= (1<<(blockno%32));
flush_block(diskaddr(2));
assert(!block_is_free(blockno));
return blockno;
}
return -E_NO_DISK;
}
// Search the bitmap for a free block and allocate it. When you
// allocate a block, immediately flush the changed bitmap block
// to disk.
//
// Return block number allocated on success,
// -E_NO_DISK if we are out of blocks.
//
// Hint: use free_block as an example for manipulating the bitmap.
int
alloc_block(void)
{
// The bitmap consists of one or more blocks. A single bitmap block
// contains the in-use bits for BLKBITSIZE blocks. There are
// super->s_nblocks blocks in the disk altogether.
// LAB 5: Your code here.
uint32_t i;
for (i = 0; i < super->s_nblocks; i++) {
if (bitmap[i / 32] & (1 << (i%32))) {
bitmap[i/32] &= ~(1<<(i%32));
flush_block(bitmap);
return i;
}
}
return -E_NO_DISK;
}