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implemented inode list operation

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FactorialN 2023-11-07 23:33:52 -08:00
parent 91ec52e718
commit 5eb9fcdbda
1 changed files with 49 additions and 8 deletions
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55
include/fs.h
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@ -22,7 +22,7 @@ public:
} }
static off_t getFreeListHead(RawDisk &disk){ static off_t getFreeListHead(RawDisk &disk){
char buffer[SECTOR_SIZE] = {0}; char buffer[8] = {0};
disk.rawdisk_read(0, buffer, sizeof(buffer)); disk.rawdisk_read(0, buffer, sizeof(buffer));
off_t t = 0; off_t t = 0;
for (int j = 0; j < 8; j++) for (int j = 0; j < 8; j++)
@ -31,12 +31,29 @@ public:
} }
static void writeFreeListHead(RawDisk &disk, off_t t){ static void writeFreeListHead(RawDisk &disk, off_t t){
char buffer[SECTOR_SIZE] = {0}; char buffer[8] = {0};
for (int j = 0; j < 8; j++){ for (int j = 0; j < 8; j++){
buffer[j] = (t >> (8 * j)) & 0xFF; buffer[j] = (t >> (8 * j)) & 0xFF;
} }
disk.rawdisk_write(0, buffer, sizeof(buffer)); disk.rawdisk_write(0, buffer, sizeof(buffer));
} }
static off_t getFreeINodeHead(RawDisk &disk){
char buffer[8] = {0};
disk.rawdisk_read(8, buffer, sizeof(buffer));
off_t t = 0;
for (int j = 0; j < 8; j++)
t = t | (((off_t)buffer[j])<<(8*j));
return t;
}
static void writeFreeINodeHead(RawDisk &disk, off_t t){
char buffer[8] = {0};
for (int j = 0; j < 8; j++){
buffer[j] = (t >> (8 * j)) & 0xFF;
}
disk.rawdisk_write(8, buffer, sizeof(buffer));
}
}; };
class INode{ class INode{
@ -382,6 +399,18 @@ class INodeOperation{
public: public:
//initialization of the rawdisk //initialization of the rawdisk
void initialize(RawDisk &disk){ void initialize(RawDisk &disk){
// initialize Inode list head
SuperBlock::writeFreeINodeHead(disk, 1);
for (off_t i = 1; i < MAX_INODE; i++){
char buffer[SECTOR_SIZE] = {0};
off_t t = i + 1;
if (t < MAX_INODE){
for (int j = 0; j < 8; j++){
buffer[j] = (t >> (8 * j)) & 0xFF;
}
}
disk.rawdisk_write(i*SECTOR_SIZE, buffer, sizeof(buffer));
}
SuperBlock::writeFreeListHead(disk, MAX_INODE*SECTOR_SIZE); // maximum inode number 2^19 0x80000 SuperBlock::writeFreeListHead(disk, MAX_INODE*SECTOR_SIZE); // maximum inode number 2^19 0x80000
//Have tested this initialize function but MAX_BLOCK too much, MAX_INODE*2 works //Have tested this initialize function but MAX_BLOCK too much, MAX_INODE*2 works
for (off_t i = MAX_INODE; i < MAX_BLOCKNUM-4096; i += 2048*8){ for (off_t i = MAX_INODE; i < MAX_BLOCKNUM-4096; i += 2048*8){
@ -396,16 +425,28 @@ public:
} }
} }
// allocate an inode and return the number of the inode // allocate an inode from free inode list head and return the number of the inode
// the i-th inode is in the i-th block // the i-th inode is in the i-th block
off_t inode_allocate(){ off_t inode_allocate(RawDisk &disk){
off_t freeINodeHead = SuperBlock::getFreeINodeHead(disk);
char buffer[SECTOR_SIZE] = {0};
disk.rawdisk_read(freeINodeHead*SECTOR_SIZE, buffer, sizeof(buffer));
off_t newINodeHead = read_byte_at(0, buffer);
// deal with no more INode
SuperBlock::writeFreeINodeHead(disk, newINodeHead);
//to do: initialize the INode on disk at freeINodeHead
//return inode number //return inode number
return freeINodeHead;
} }
// // free the inode and add it to the free inode list head
void inode_free(off_t iNodeNumber){ void inode_free(RawDisk &disk, off_t INodeNumber){
off_t freeINodeHead = SuperBlock::getFreeINodeHead(disk);
char buffer[SECTOR_SIZE] = {0};
write_byte_at(freeINodeHead, 0, buffer);
disk.rawdisk_write(INodeNumber*SECTOR_SIZE, buffer, sizeof(buffer));
SuperBlock::writeFreeINodeHead(disk, INodeNumber);
} }
//ignore for now //ignore for now