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implemented deallo list operation

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FactorialN 2023-11-07 23:09:59 -08:00
parent 489b92cf24
commit 91ec52e718
1 changed files with 19 additions and 4 deletions
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21
include/fs.h
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@ -148,9 +148,7 @@ public:
} }
} }
if (!notFull){ if (!notFull){
off_t next_header = 0; off_t next_header = read_byte_at(0, buffer);
for (int j = 0; j < 8; j++)
next_header = next_header | (((off_t)buffer[j])<<(8*j));
SuperBlock::writeFreeListHead(disk, next_header); SuperBlock::writeFreeListHead(disk, next_header);
} }
return freeBlockNum; return freeBlockNum;
@ -247,10 +245,27 @@ public:
void datablock_deallocate_in_list(off_t freeBlockNum) { void datablock_deallocate_in_list(off_t freeBlockNum) {
// find the related 2048block head // find the related 2048block head
off_t freeBlockHead = ((freeBlockNum/SECTOR_SIZE-MAX_INODE)/(8*2048)*(8*2048)+MAX_INODE)*SECTOR_SIZE;
// mark it alive in its bitmap // mark it alive in its bitmap
char buffer[IO_BLOCK_SIZE] = {0};
bool notEmpty = false;
disk.rawdisk_read(freeBlockHead, buffer, sizeof(buffer));
for (int i = 8; i < 264; i++){
if(buffer[i] != 0){
notEmpty = true;
}
}
off_t inBlockPos = (freeBlockNum-freeBlockHead)/IO_BLOCK_SIZE-1;
buffer[8+inBlockPos/8] |= (1<<(inBlockPos%8));
// if its bitmap was 0, add it back to the list head // if its bitmap was 0, add it back to the list head
if(!notEmpty){
off_t freeListHead = SuperBlock::getFreeListHead(disk);
write_byte_at(freeListHead, 0, buffer);
SuperBlock::writeFreeListHead(disk, freeBlockHead);
}
disk.rawdisk_write(freeBlockHead, buffer, sizeof(buffer));
} }
off_t deallo_single_indirect(RawDisk &disk, off_t &single_i){ off_t deallo_single_indirect(RawDisk &disk, off_t &single_i){