/*
* Free a block.
*/
static
void
sfs_bfree(struct sfs_fs *sfs, uint32_t diskblock)
{
bitmap_unmark(sfs->sfs_freemap, diskblock);
sfs->sfs_freemapdirty = true;
}
void bitmap_ts_unmark(struct bitmap_ts* b, unsigned index) {
assert(b != NULL);
lock_acquire(b->lk);
bitmap_unmark(b->bm, index);
lock_release(b->lk);
}
/*
destroy all pages in physical memory and all swapped pages
*/
void
as_destroy(struct addrspace *as)
{
int spl = splhigh();
int i = 0;
//free all coremap entries
for (; i < num_frames; i++) {
if(coremap[i].state != FREE && coremap[i].addrspace == as){
coremap[i].addrspace = NULL;
coremap[i].mapped_vaddr = 0;
coremap[i].state = FREE;
coremap[i].num_pages_allocated = 0;
}
}
// free all pages in the swap file
for(; i < array_getnum(as->as_regions); i++) {
struct as_region* cur = (struct as_region*)array_getguy(as->as_regions, i);
assert(cur->vbase % PAGE_SIZE == 0);
// destroy all pages belonging to this region
int j = 0;
for (; j < cur->npages; j++) {
vaddr_t page = cur->vbase + j * PAGE_SIZE;
assert((page & PAGE_FRAME) == page);
u_int32_t *pte = get_PTE_from_addrspace(as, page);
if (((*pte & PTE_PRESENT) == 0) && ((*pte | PTE_SWAPPED) != 0)) {
// if this page is in swap file...
off_t file_slot = (*pte & SWAPFILE_OFFSET) >> 12;
// the occupied bit must be set
assert(bitmap_isset(swapfile_map, file_slot) != 0);
bitmap_unmark(swapfile_map, file_slot);
}
}
}
/*remove the page table entry mapped with paddr, */
int remove_ppage (u_int32_t paddr)
{
int result = 0;
int spl=splhigh();
paddr = paddr & PAGE_FRAME;
//get the index of the page in the page table
int page_index = (paddr - coremap_base) / PAGE_SIZE;
//make sure that the paddr address is valid
assert((coremap[ page_index ].paddr & PAGE_FRAME) == (paddr & PAGE_FRAME));
/*
* Clear the _PTE fields for this entry
*/
coremap[ page_index ].vaddr = 0;
coremap[ page_index ].paddr = paddr & PAGE_FRAME;
coremap[ page_index ].last_access_time_sec = 0;
coremap[ page_index ].last_access_time_nsec = 0;
coremap[ page_index ].pid = 0;
coremap[ page_index ].status = PAGE_FREE;
/*
* umnark the bit of the core memory map to indicate that the page is free
*/
bitmap_unmark(core_memmap, page_index);
splx(spl);
return result;
}
/*remove the swapped in page from the swap area mapping*/
int remove_spage (u_int32_t chunk)
{
int result = 0;
//get the index of the chunk in the swap area
int chunk_index = (chunk & PAGE_FRAME) / PAGE_SIZE;
//make sure that the chunk address is valid
assert( (swaparea[ chunk_index ].paddr & PAGE_FRAME) == chunk );
/*
* Clear the swapmap for this chunk
*/
int spl=splhigh();
swaparea[ chunk_index ].vaddr = 0;
swaparea[ chunk_index ].paddr = chunk;
swaparea[ chunk_index ].last_access_time_sec = 0;
swaparea[ chunk_index ].last_access_time_nsec = 0;
swaparea[ chunk_index ].pid = 0;
/*
* unmark the memmap for the chunk to indicate that the chunk is free.
*/
bitmap_unmark(swap_memmap, chunk_index);
splx(spl);
return result;
}
/* release allocated block */
static void
testfs_put_block_freemap(struct super_block *sb, int block_nr)
{
assert(sb->block_freemap);
bitmap_unmark(sb->block_freemap, block_nr);
testfs_write_block_freemap(sb, block_nr);
}
static int ToMem(u_int32_t flatloc, vaddr_t vaddr)
{
assert(lock_do_i_hold(&vmlock));
assert((vaddr & 0xfffff000) == vaddr);
assert((flatloc & 0xfffff000) == flatloc);
struct uio ku;
int result;
u_int32_t bitmaploc, diskloc, diskindex;
bitmaploc = flatloc/PAGE_SIZE;
assert (bitmap_isset(diskmap, bitmaploc));
diskindex = flatloc / DISKSPACE;
diskloc = flatloc - diskindex * DISKSPACE;
mk_kuio(&ku, (void*)vaddr , PAGE_SIZE, diskloc, UIO_READ);
result = VOP_READ(disk[diskindex], &ku);
if (result) {
panic(strerror(result));
}
bitmap_unmark(diskmap, bitmaploc);
return result;
}
/*
* Free a block.
*/
static
void
sfs_bfree(struct sfs_fs *sfs, u_int32_t diskblock)
{
/* Don't think we need to synchronize this */
bitmap_unmark(sfs->sfs_freemap, diskblock);
sfs->sfs_freemapdirty = 1;
}
void
file_free_page(struct file *f, page_t page)
{
assert(f != NULL);
assert(f->f_page_bitmap != NULL);
assert(bitmap_isset(f->f_page_bitmap, page));
bitmap_unmark(f->f_page_bitmap, page);
//assert(file_sync_bitmap(f) == 0);
}
void
testfs_put_inode_freemap(struct super_block *sb, int inode_nr)
{
assert(sb->inode_freemap);
bitmap_unmark(sb->inode_freemap, inode_nr);
testfs_write_inode_freemap(sb, inode_nr);
assert(sb->sb.used_inode_count > 0);
sb->sb.used_inode_count--;
testfs_write_super_block(sb);
}
static int DiskClear(u_int32_t flatloc)
{
assert(lock_do_i_hold(&vmlock));
assert((flatloc & 0xfffff000) == flatloc);
u_int32_t bitmaploc;
bitmaploc = flatloc/PAGE_SIZE;
assert (bitmap_isset(diskmap, bitmaploc));
bitmap_unmark(diskmap, bitmaploc);
return 0;
}
void
swap_dealloc( off_t offset ) {
int ix;
//the index is simply the offset divided by page size.
ix = offset / PAGE_SIZE;
//lock the swap.
LOCK_SWAP();
//mark this index as unused.
bitmap_unmark( bm_sw, ix );
//update stats.
++ss_sw.ss_free;
//unlock the swap.
UNLOCK_SWAP();
}
/*
* swap_free: marks a page in the swapfile as unused.
*
* Synchronization: uses swaplock.
*/
void
swap_free(off_t swapaddr)
{
uint32_t index;
KASSERT(swapaddr != INVALID_SWAPADDR);
KASSERT(swapaddr % PAGE_SIZE == 0);
index = swapaddr / PAGE_SIZE;
lock_acquire(swaplock);
KASSERT(swap_free_pages < swap_total_pages);
KASSERT(swap_reserved_pages <= swap_free_pages);
KASSERT(bitmap_isset(swapmap, index));
bitmap_unmark(swapmap, index);
swap_free_pages++;
lock_release(swaplock);
}
/*
* Allocate a block.
*/
int
sfs_balloc(struct sfs_fs *sfs, daddr_t *diskblock)
{
int result;
result = bitmap_alloc(sfs->sfs_freemap, diskblock);
if (result) {
return result;
}
sfs->sfs_freemapdirty = true;
if (*diskblock >= sfs->sfs_sb.sb_nblocks) {
panic("sfs: balloc: invalid block %u\n", *diskblock);
}
/* Clear block before returning it */
result = sfs_clearblock(sfs, *diskblock);
if (result) {
bitmap_unmark(sfs->sfs_freemap, *diskblock);
}
return result;
}
/*
* Free a block.
*/
void
sfs_bfree(struct sfs_fs *sfs, daddr_t diskblock)
{
bitmap_unmark(sfs->sfs_freemap, diskblock);
sfs->sfs_freemapdirty = true;
}
/* release allocated inode */
void testfs_put_inode_freemap(struct super_block *sb, int inode_nr) {
assert(sb->inode_freemap);
bitmap_unmark(sb->inode_freemap, inode_nr);
testfs_write_inode_freemap(sb, inode_nr);
}