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OpenCloudOS-Kernel/mm/swapfile.c

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/*
* linux/mm/swapfile.c
*
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
* Swap reorganised 29.12.95, Stephen Tweedie
*/
#include <linux/config.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/kernel_stat.h>
#include <linux/swap.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/namei.h>
#include <linux/shm.h>
#include <linux/blkdev.h>
#include <linux/writeback.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/rmap.h>
#include <linux/security.h>
#include <linux/backing-dev.h>
#include <linux/syscalls.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <linux/swapops.h>
DEFINE_SPINLOCK(swaplock);
unsigned int nr_swapfiles;
long total_swap_pages;
static int swap_overflow;
EXPORT_SYMBOL(total_swap_pages);
static const char Bad_file[] = "Bad swap file entry ";
static const char Unused_file[] = "Unused swap file entry ";
static const char Bad_offset[] = "Bad swap offset entry ";
static const char Unused_offset[] = "Unused swap offset entry ";
struct swap_list_t swap_list = {-1, -1};
struct swap_info_struct swap_info[MAX_SWAPFILES];
static DECLARE_MUTEX(swapon_sem);
/*
* We need this because the bdev->unplug_fn can sleep and we cannot
* hold swap_list_lock while calling the unplug_fn. And swap_list_lock
* cannot be turned into a semaphore.
*/
static DECLARE_RWSEM(swap_unplug_sem);
#define SWAPFILE_CLUSTER 256
void swap_unplug_io_fn(struct backing_dev_info *unused_bdi, struct page *page)
{
swp_entry_t entry;
down_read(&swap_unplug_sem);
entry.val = page->private;
if (PageSwapCache(page)) {
struct block_device *bdev = swap_info[swp_type(entry)].bdev;
struct backing_dev_info *bdi;
/*
* If the page is removed from swapcache from under us (with a
* racy try_to_unuse/swapoff) we need an additional reference
* count to avoid reading garbage from page->private above. If
* the WARN_ON triggers during a swapoff it maybe the race
* condition and it's harmless. However if it triggers without
* swapoff it signals a problem.
*/
WARN_ON(page_count(page) <= 1);
bdi = bdev->bd_inode->i_mapping->backing_dev_info;
blk_run_backing_dev(bdi, page);
}
up_read(&swap_unplug_sem);
}
static inline int scan_swap_map(struct swap_info_struct *si)
{
unsigned long offset;
/*
* We try to cluster swap pages by allocating them
* sequentially in swap. Once we've allocated
* SWAPFILE_CLUSTER pages this way, however, we resort to
* first-free allocation, starting a new cluster. This
* prevents us from scattering swap pages all over the entire
* swap partition, so that we reduce overall disk seek times
* between swap pages. -- sct */
if (si->cluster_nr) {
while (si->cluster_next <= si->highest_bit) {
offset = si->cluster_next++;
if (si->swap_map[offset])
continue;
si->cluster_nr--;
goto got_page;
}
}
si->cluster_nr = SWAPFILE_CLUSTER;
/* try to find an empty (even not aligned) cluster. */
offset = si->lowest_bit;
check_next_cluster:
if (offset+SWAPFILE_CLUSTER-1 <= si->highest_bit)
{
unsigned long nr;
for (nr = offset; nr < offset+SWAPFILE_CLUSTER; nr++)
if (si->swap_map[nr])
{
offset = nr+1;
goto check_next_cluster;
}
/* We found a completly empty cluster, so start
* using it.
*/
goto got_page;
}
/* No luck, so now go finegrined as usual. -Andrea */
for (offset = si->lowest_bit; offset <= si->highest_bit ; offset++) {
if (si->swap_map[offset])
continue;
si->lowest_bit = offset+1;
got_page:
if (offset == si->lowest_bit)
si->lowest_bit++;
if (offset == si->highest_bit)
si->highest_bit--;
if (si->lowest_bit > si->highest_bit) {
si->lowest_bit = si->max;
si->highest_bit = 0;
}
si->swap_map[offset] = 1;
si->inuse_pages++;
nr_swap_pages--;
si->cluster_next = offset+1;
return offset;
}
si->lowest_bit = si->max;
si->highest_bit = 0;
return 0;
}
swp_entry_t get_swap_page(void)
{
struct swap_info_struct * p;
unsigned long offset;
swp_entry_t entry;
int type, wrapped = 0;
entry.val = 0; /* Out of memory */
swap_list_lock();
type = swap_list.next;
if (type < 0)
goto out;
if (nr_swap_pages <= 0)
goto out;
while (1) {
p = &swap_info[type];
if ((p->flags & SWP_ACTIVE) == SWP_ACTIVE) {
swap_device_lock(p);
offset = scan_swap_map(p);
swap_device_unlock(p);
if (offset) {
entry = swp_entry(type,offset);
type = swap_info[type].next;
if (type < 0 ||
p->prio != swap_info[type].prio) {
swap_list.next = swap_list.head;
} else {
swap_list.next = type;
}
goto out;
}
}
type = p->next;
if (!wrapped) {
if (type < 0 || p->prio != swap_info[type].prio) {
type = swap_list.head;
wrapped = 1;
}
} else
if (type < 0)
goto out; /* out of swap space */
}
out:
swap_list_unlock();
return entry;
}
static struct swap_info_struct * swap_info_get(swp_entry_t entry)
{
struct swap_info_struct * p;
unsigned long offset, type;
if (!entry.val)
goto out;
type = swp_type(entry);
if (type >= nr_swapfiles)
goto bad_nofile;
p = & swap_info[type];
if (!(p->flags & SWP_USED))
goto bad_device;
offset = swp_offset(entry);
if (offset >= p->max)
goto bad_offset;
if (!p->swap_map[offset])
goto bad_free;
swap_list_lock();
if (p->prio > swap_info[swap_list.next].prio)
swap_list.next = type;
swap_device_lock(p);
return p;
bad_free:
printk(KERN_ERR "swap_free: %s%08lx\n", Unused_offset, entry.val);
goto out;
bad_offset:
printk(KERN_ERR "swap_free: %s%08lx\n", Bad_offset, entry.val);
goto out;
bad_device:
printk(KERN_ERR "swap_free: %s%08lx\n", Unused_file, entry.val);
goto out;
bad_nofile:
printk(KERN_ERR "swap_free: %s%08lx\n", Bad_file, entry.val);
out:
return NULL;
}
static void swap_info_put(struct swap_info_struct * p)
{
swap_device_unlock(p);
swap_list_unlock();
}
static int swap_entry_free(struct swap_info_struct *p, unsigned long offset)
{
int count = p->swap_map[offset];
if (count < SWAP_MAP_MAX) {
count--;
p->swap_map[offset] = count;
if (!count) {
if (offset < p->lowest_bit)
p->lowest_bit = offset;
if (offset > p->highest_bit)
p->highest_bit = offset;
nr_swap_pages++;
p->inuse_pages--;
}
}
return count;
}
/*
* Caller has made sure that the swapdevice corresponding to entry
* is still around or has not been recycled.
*/
void swap_free(swp_entry_t entry)
{
struct swap_info_struct * p;
p = swap_info_get(entry);
if (p) {
swap_entry_free(p, swp_offset(entry));
swap_info_put(p);
}
}
/*
* How many references to page are currently swapped out?
*/
static inline int page_swapcount(struct page *page)
{
int count = 0;
struct swap_info_struct *p;
swp_entry_t entry;
entry.val = page->private;
p = swap_info_get(entry);
if (p) {
/* Subtract the 1 for the swap cache itself */
count = p->swap_map[swp_offset(entry)] - 1;
swap_info_put(p);
}
return count;
}
/*
* We can use this swap cache entry directly
* if there are no other references to it.
*/
int can_share_swap_page(struct page *page)
{
int count;
BUG_ON(!PageLocked(page));
count = page_mapcount(page);
if (count <= 1 && PageSwapCache(page))
count += page_swapcount(page);
return count == 1;
}
/*
* Work out if there are any other processes sharing this
* swap cache page. Free it if you can. Return success.
*/
int remove_exclusive_swap_page(struct page *page)
{
int retval;
struct swap_info_struct * p;
swp_entry_t entry;
BUG_ON(PagePrivate(page));
BUG_ON(!PageLocked(page));
if (!PageSwapCache(page))
return 0;
if (PageWriteback(page))
return 0;
if (page_count(page) != 2) /* 2: us + cache */
return 0;
entry.val = page->private;
p = swap_info_get(entry);
if (!p)
return 0;
/* Is the only swap cache user the cache itself? */
retval = 0;
if (p->swap_map[swp_offset(entry)] == 1) {
/* Recheck the page count with the swapcache lock held.. */
write_lock_irq(&swapper_space.tree_lock);
if ((page_count(page) == 2) && !PageWriteback(page)) {
__delete_from_swap_cache(page);
SetPageDirty(page);
retval = 1;
}
write_unlock_irq(&swapper_space.tree_lock);
}
swap_info_put(p);
if (retval) {
swap_free(entry);
page_cache_release(page);
}
return retval;
}
/*
* Free the swap entry like above, but also try to
* free the page cache entry if it is the last user.
*/
void free_swap_and_cache(swp_entry_t entry)
{
struct swap_info_struct * p;
struct page *page = NULL;
p = swap_info_get(entry);
if (p) {
if (swap_entry_free(p, swp_offset(entry)) == 1)
page = find_trylock_page(&swapper_space, entry.val);
swap_info_put(p);
}
if (page) {
int one_user;
BUG_ON(PagePrivate(page));
page_cache_get(page);
one_user = (page_count(page) == 2);
/* Only cache user (+us), or swap space full? Free it! */
if (!PageWriteback(page) && (one_user || vm_swap_full())) {
delete_from_swap_cache(page);
SetPageDirty(page);
}
unlock_page(page);
page_cache_release(page);
}
}
/*
* Always set the resulting pte to be nowrite (the same as COW pages
* after one process has exited). We don't know just how many PTEs will
* share this swap entry, so be cautious and let do_wp_page work out
* what to do if a write is requested later.
*
* vma->vm_mm->page_table_lock is held.
*/
static void unuse_pte(struct vm_area_struct *vma, pte_t *pte,
unsigned long addr, swp_entry_t entry, struct page *page)
{
inc_mm_counter(vma->vm_mm, rss);
get_page(page);
set_pte_at(vma->vm_mm, addr, pte,
pte_mkold(mk_pte(page, vma->vm_page_prot)));
page_add_anon_rmap(page, vma, addr);
swap_free(entry);
/*
* Move the page to the active list so it is not
* immediately swapped out again after swapon.
*/
activate_page(page);
}
static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
swp_entry_t entry, struct page *page)
{
pte_t *pte;
pte_t swp_pte = swp_entry_to_pte(entry);
pte = pte_offset_map(pmd, addr);
do {
/*
* swapoff spends a _lot_ of time in this loop!
* Test inline before going to call unuse_pte.
*/
if (unlikely(pte_same(*pte, swp_pte))) {
unuse_pte(vma, pte, addr, entry, page);
pte_unmap(pte);
return 1;
}
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
return 0;
}
static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
swp_entry_t entry, struct page *page)
{
pmd_t *pmd;
unsigned long next;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
if (unuse_pte_range(vma, pmd, addr, next, entry, page))
return 1;
} while (pmd++, addr = next, addr != end);
return 0;
}
static inline int unuse_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end,
swp_entry_t entry, struct page *page)
{
pud_t *pud;
unsigned long next;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
if (unuse_pmd_range(vma, pud, addr, next, entry, page))
return 1;
} while (pud++, addr = next, addr != end);
return 0;
}
static int unuse_vma(struct vm_area_struct *vma,
swp_entry_t entry, struct page *page)
{
pgd_t *pgd;
unsigned long addr, end, next;
if (page->mapping) {
addr = page_address_in_vma(page, vma);
if (addr == -EFAULT)
return 0;
else
end = addr + PAGE_SIZE;
} else {
addr = vma->vm_start;
end = vma->vm_end;
}
pgd = pgd_offset(vma->vm_mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
if (unuse_pud_range(vma, pgd, addr, next, entry, page))
return 1;
} while (pgd++, addr = next, addr != end);
return 0;
}
static int unuse_mm(struct mm_struct *mm,
swp_entry_t entry, struct page *page)
{
struct vm_area_struct *vma;
if (!down_read_trylock(&mm->mmap_sem)) {
/*
* Activate page so shrink_cache is unlikely to unmap its
* ptes while lock is dropped, so swapoff can make progress.
*/
activate_page(page);
unlock_page(page);
down_read(&mm->mmap_sem);
lock_page(page);
}
spin_lock(&mm->page_table_lock);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (vma->anon_vma && unuse_vma(vma, entry, page))
break;
}
spin_unlock(&mm->page_table_lock);
up_read(&mm->mmap_sem);
/*
* Currently unuse_mm cannot fail, but leave error handling
* at call sites for now, since we change it from time to time.
*/
return 0;
}
/*
* Scan swap_map from current position to next entry still in use.
* Recycle to start on reaching the end, returning 0 when empty.
*/
static int find_next_to_unuse(struct swap_info_struct *si, int prev)
{
int max = si->max;
int i = prev;
int count;
/*
* No need for swap_device_lock(si) here: we're just looking
* for whether an entry is in use, not modifying it; false
* hits are okay, and sys_swapoff() has already prevented new
* allocations from this area (while holding swap_list_lock()).
*/
for (;;) {
if (++i >= max) {
if (!prev) {
i = 0;
break;
}
/*
* No entries in use at top of swap_map,
* loop back to start and recheck there.
*/
max = prev + 1;
prev = 0;
i = 1;
}
count = si->swap_map[i];
if (count && count != SWAP_MAP_BAD)
break;
}
return i;
}
/*
* We completely avoid races by reading each swap page in advance,
* and then search for the process using it. All the necessary
* page table adjustments can then be made atomically.
*/
static int try_to_unuse(unsigned int type)
{
struct swap_info_struct * si = &swap_info[type];
struct mm_struct *start_mm;
unsigned short *swap_map;
unsigned short swcount;
struct page *page;
swp_entry_t entry;
int i = 0;
int retval = 0;
int reset_overflow = 0;
int shmem;
/*
* When searching mms for an entry, a good strategy is to
* start at the first mm we freed the previous entry from
* (though actually we don't notice whether we or coincidence
* freed the entry). Initialize this start_mm with a hold.
*
* A simpler strategy would be to start at the last mm we
* freed the previous entry from; but that would take less
* advantage of mmlist ordering, which clusters forked mms
* together, child after parent. If we race with dup_mmap(), we
* prefer to resolve parent before child, lest we miss entries
* duplicated after we scanned child: using last mm would invert
* that. Though it's only a serious concern when an overflowed
* swap count is reset from SWAP_MAP_MAX, preventing a rescan.
*/
start_mm = &init_mm;
atomic_inc(&init_mm.mm_users);
/*
* Keep on scanning until all entries have gone. Usually,
* one pass through swap_map is enough, but not necessarily:
* there are races when an instance of an entry might be missed.
*/
while ((i = find_next_to_unuse(si, i)) != 0) {
if (signal_pending(current)) {
retval = -EINTR;
break;
}
/*
* Get a page for the entry, using the existing swap
* cache page if there is one. Otherwise, get a clean
* page and read the swap into it.
*/
swap_map = &si->swap_map[i];
entry = swp_entry(type, i);
page = read_swap_cache_async(entry, NULL, 0);
if (!page) {
/*
* Either swap_duplicate() failed because entry
* has been freed independently, and will not be
* reused since sys_swapoff() already disabled
* allocation from here, or alloc_page() failed.
*/
if (!*swap_map)
continue;
retval = -ENOMEM;
break;
}
/*
* Don't hold on to start_mm if it looks like exiting.
*/
if (atomic_read(&start_mm->mm_users) == 1) {
mmput(start_mm);
start_mm = &init_mm;
atomic_inc(&init_mm.mm_users);
}
/*
* Wait for and lock page. When do_swap_page races with
* try_to_unuse, do_swap_page can handle the fault much
* faster than try_to_unuse can locate the entry. This
* apparently redundant "wait_on_page_locked" lets try_to_unuse
* defer to do_swap_page in such a case - in some tests,
* do_swap_page and try_to_unuse repeatedly compete.
*/
wait_on_page_locked(page);
wait_on_page_writeback(page);
lock_page(page);
wait_on_page_writeback(page);
/*
* Remove all references to entry.
* Whenever we reach init_mm, there's no address space
* to search, but use it as a reminder to search shmem.
*/
shmem = 0;
swcount = *swap_map;
if (swcount > 1) {
if (start_mm == &init_mm)
shmem = shmem_unuse(entry, page);
else
retval = unuse_mm(start_mm, entry, page);
}
if (*swap_map > 1) {
int set_start_mm = (*swap_map >= swcount);
struct list_head *p = &start_mm->mmlist;
struct mm_struct *new_start_mm = start_mm;
struct mm_struct *prev_mm = start_mm;
struct mm_struct *mm;
atomic_inc(&new_start_mm->mm_users);
atomic_inc(&prev_mm->mm_users);
spin_lock(&mmlist_lock);
while (*swap_map > 1 && !retval &&
(p = p->next) != &start_mm->mmlist) {
mm = list_entry(p, struct mm_struct, mmlist);
if (atomic_inc_return(&mm->mm_users) == 1) {
atomic_dec(&mm->mm_users);
continue;
}
spin_unlock(&mmlist_lock);
mmput(prev_mm);
prev_mm = mm;
cond_resched();
swcount = *swap_map;
if (swcount <= 1)
;
else if (mm == &init_mm) {
set_start_mm = 1;
shmem = shmem_unuse(entry, page);
} else
retval = unuse_mm(mm, entry, page);
if (set_start_mm && *swap_map < swcount) {
mmput(new_start_mm);
atomic_inc(&mm->mm_users);
new_start_mm = mm;
set_start_mm = 0;
}
spin_lock(&mmlist_lock);
}
spin_unlock(&mmlist_lock);
mmput(prev_mm);
mmput(start_mm);
start_mm = new_start_mm;
}
if (retval) {
unlock_page(page);
page_cache_release(page);
break;
}
/*
* How could swap count reach 0x7fff when the maximum
* pid is 0x7fff, and there's no way to repeat a swap
* page within an mm (except in shmem, where it's the
* shared object which takes the reference count)?
* We believe SWAP_MAP_MAX cannot occur in Linux 2.4.
*
* If that's wrong, then we should worry more about
* exit_mmap() and do_munmap() cases described above:
* we might be resetting SWAP_MAP_MAX too early here.
* We know "Undead"s can happen, they're okay, so don't
* report them; but do report if we reset SWAP_MAP_MAX.
*/
if (*swap_map == SWAP_MAP_MAX) {
swap_device_lock(si);
*swap_map = 1;
swap_device_unlock(si);
reset_overflow = 1;
}
/*
* If a reference remains (rare), we would like to leave
* the page in the swap cache; but try_to_unmap could
* then re-duplicate the entry once we drop page lock,
* so we might loop indefinitely; also, that page could
* not be swapped out to other storage meanwhile. So:
* delete from cache even if there's another reference,
* after ensuring that the data has been saved to disk -
* since if the reference remains (rarer), it will be
* read from disk into another page. Splitting into two
* pages would be incorrect if swap supported "shared
* private" pages, but they are handled by tmpfs files.
*
* Note shmem_unuse already deleted a swappage from
* the swap cache, unless the move to filepage failed:
* in which case it left swappage in cache, lowered its
* swap count to pass quickly through the loops above,
* and now we must reincrement count to try again later.
*/
if ((*swap_map > 1) && PageDirty(page) && PageSwapCache(page)) {
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
};
swap_writepage(page, &wbc);
lock_page(page);
wait_on_page_writeback(page);
}
if (PageSwapCache(page)) {
if (shmem)
swap_duplicate(entry);
else
delete_from_swap_cache(page);
}
/*
* So we could skip searching mms once swap count went
* to 1, we did not mark any present ptes as dirty: must
* mark page dirty so shrink_list will preserve it.
*/
SetPageDirty(page);
unlock_page(page);
page_cache_release(page);
/*
* Make sure that we aren't completely killing
* interactive performance.
*/
cond_resched();
}
mmput(start_mm);
if (reset_overflow) {
printk(KERN_WARNING "swapoff: cleared swap entry overflow\n");
swap_overflow = 0;
}
return retval;
}
/*
* After a successful try_to_unuse, if no swap is now in use, we know we
* can empty the mmlist. swap_list_lock must be held on entry and exit.
* Note that mmlist_lock nests inside swap_list_lock, and an mm must be
* added to the mmlist just after page_duplicate - before would be racy.
*/
static void drain_mmlist(void)
{
struct list_head *p, *next;
unsigned int i;
for (i = 0; i < nr_swapfiles; i++)
if (swap_info[i].inuse_pages)
return;
spin_lock(&mmlist_lock);
list_for_each_safe(p, next, &init_mm.mmlist)
list_del_init(p);
spin_unlock(&mmlist_lock);
}
/*
* Use this swapdev's extent info to locate the (PAGE_SIZE) block which
* corresponds to page offset `offset'.
*/
sector_t map_swap_page(struct swap_info_struct *sis, pgoff_t offset)
{
struct swap_extent *se = sis->curr_swap_extent;
struct swap_extent *start_se = se;
for ( ; ; ) {
struct list_head *lh;
if (se->start_page <= offset &&
offset < (se->start_page + se->nr_pages)) {
return se->start_block + (offset - se->start_page);
}
lh = se->list.prev;
if (lh == &sis->extent_list)
lh = lh->prev;
se = list_entry(lh, struct swap_extent, list);
sis->curr_swap_extent = se;
BUG_ON(se == start_se); /* It *must* be present */
}
}
/*
* Free all of a swapdev's extent information
*/
static void destroy_swap_extents(struct swap_info_struct *sis)
{
while (!list_empty(&sis->extent_list)) {
struct swap_extent *se;
se = list_entry(sis->extent_list.next,
struct swap_extent, list);
list_del(&se->list);
kfree(se);
}
sis->nr_extents = 0;
}
/*
* Add a block range (and the corresponding page range) into this swapdev's
* extent list. The extent list is kept sorted in block order.
*
* This function rather assumes that it is called in ascending sector_t order.
* It doesn't look for extent coalescing opportunities.
*/
static int
add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
unsigned long nr_pages, sector_t start_block)
{
struct swap_extent *se;
struct swap_extent *new_se;
struct list_head *lh;
lh = sis->extent_list.next; /* The highest-addressed block */
while (lh != &sis->extent_list) {
se = list_entry(lh, struct swap_extent, list);
if (se->start_block + se->nr_pages == start_block &&
se->start_page + se->nr_pages == start_page) {
/* Merge it */
se->nr_pages += nr_pages;
return 0;
}
lh = lh->next;
}
/*
* No merge. Insert a new extent, preserving ordering.
*/
new_se = kmalloc(sizeof(*se), GFP_KERNEL);
if (new_se == NULL)
return -ENOMEM;
new_se->start_page = start_page;
new_se->nr_pages = nr_pages;
new_se->start_block = start_block;
lh = sis->extent_list.prev; /* The lowest block */
while (lh != &sis->extent_list) {
se = list_entry(lh, struct swap_extent, list);
if (se->start_block > start_block)
break;
lh = lh->prev;
}
list_add_tail(&new_se->list, lh);
sis->nr_extents++;
return 0;
}
/*
* A `swap extent' is a simple thing which maps a contiguous range of pages
* onto a contiguous range of disk blocks. An ordered list of swap extents
* is built at swapon time and is then used at swap_writepage/swap_readpage
* time for locating where on disk a page belongs.
*
* If the swapfile is an S_ISBLK block device, a single extent is installed.
* This is done so that the main operating code can treat S_ISBLK and S_ISREG
* swap files identically.
*
* Whether the swapdev is an S_ISREG file or an S_ISBLK blockdev, the swap
* extent list operates in PAGE_SIZE disk blocks. Both S_ISREG and S_ISBLK
* swapfiles are handled *identically* after swapon time.
*
* For S_ISREG swapfiles, setup_swap_extents() will walk all the file's blocks
* and will parse them into an ordered extent list, in PAGE_SIZE chunks. If
* some stray blocks are found which do not fall within the PAGE_SIZE alignment
* requirements, they are simply tossed out - we will never use those blocks
* for swapping.
*
* For S_ISREG swapfiles we hold i_sem across the life of the swapon. This
* prevents root from shooting her foot off by ftruncating an in-use swapfile,
* which will scribble on the fs.
*
* The amount of disk space which a single swap extent represents varies.
* Typically it is in the 1-4 megabyte range. So we can have hundreds of
* extents in the list. To avoid much list walking, we cache the previous
* search location in `curr_swap_extent', and start new searches from there.
* This is extremely effective. The average number of iterations in
* map_swap_page() has been measured at about 0.3 per page. - akpm.
*/
static int setup_swap_extents(struct swap_info_struct *sis)
{
struct inode *inode;
unsigned blocks_per_page;
unsigned long page_no;
unsigned blkbits;
sector_t probe_block;
sector_t last_block;
int ret;
inode = sis->swap_file->f_mapping->host;
if (S_ISBLK(inode->i_mode)) {
ret = add_swap_extent(sis, 0, sis->max, 0);
goto done;
}
blkbits = inode->i_blkbits;
blocks_per_page = PAGE_SIZE >> blkbits;
/*
* Map all the blocks into the extent list. This code doesn't try
* to be very smart.
*/
probe_block = 0;
page_no = 0;
last_block = i_size_read(inode) >> blkbits;
while ((probe_block + blocks_per_page) <= last_block &&
page_no < sis->max) {
unsigned block_in_page;
sector_t first_block;
first_block = bmap(inode, probe_block);
if (first_block == 0)
goto bad_bmap;
/*
* It must be PAGE_SIZE aligned on-disk
*/
if (first_block & (blocks_per_page - 1)) {
probe_block++;
goto reprobe;
}
for (block_in_page = 1; block_in_page < blocks_per_page;
block_in_page++) {
sector_t block;
block = bmap(inode, probe_block + block_in_page);
if (block == 0)
goto bad_bmap;
if (block != first_block + block_in_page) {
/* Discontiguity */
probe_block++;
goto reprobe;
}
}
/*
* We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks
*/
ret = add_swap_extent(sis, page_no, 1,
first_block >> (PAGE_SHIFT - blkbits));
if (ret)
goto out;
page_no++;
probe_block += blocks_per_page;
reprobe:
continue;
}
ret = 0;
if (page_no == 0)
ret = -EINVAL;
sis->max = page_no;
sis->highest_bit = page_no - 1;
done:
sis->curr_swap_extent = list_entry(sis->extent_list.prev,
struct swap_extent, list);
goto out;
bad_bmap:
printk(KERN_ERR "swapon: swapfile has holes\n");
ret = -EINVAL;
out:
return ret;
}
#if 0 /* We don't need this yet */
#include <linux/backing-dev.h>
int page_queue_congested(struct page *page)
{
struct backing_dev_info *bdi;
BUG_ON(!PageLocked(page)); /* It pins the swap_info_struct */
if (PageSwapCache(page)) {
swp_entry_t entry = { .val = page->private };
struct swap_info_struct *sis;
sis = get_swap_info_struct(swp_type(entry));
bdi = sis->bdev->bd_inode->i_mapping->backing_dev_info;
} else
bdi = page->mapping->backing_dev_info;
return bdi_write_congested(bdi);
}
#endif
asmlinkage long sys_swapoff(const char __user * specialfile)
{
struct swap_info_struct * p = NULL;
unsigned short *swap_map;
struct file *swap_file, *victim;
struct address_space *mapping;
struct inode *inode;
char * pathname;
int i, type, prev;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
pathname = getname(specialfile);
err = PTR_ERR(pathname);
if (IS_ERR(pathname))
goto out;
victim = filp_open(pathname, O_RDWR|O_LARGEFILE, 0);
putname(pathname);
err = PTR_ERR(victim);
if (IS_ERR(victim))
goto out;
mapping = victim->f_mapping;
prev = -1;
swap_list_lock();
for (type = swap_list.head; type >= 0; type = swap_info[type].next) {
p = swap_info + type;
if ((p->flags & SWP_ACTIVE) == SWP_ACTIVE) {
if (p->swap_file->f_mapping == mapping)
break;
}
prev = type;
}
if (type < 0) {
err = -EINVAL;
swap_list_unlock();
goto out_dput;
}
if (!security_vm_enough_memory(p->pages))
vm_unacct_memory(p->pages);
else {
err = -ENOMEM;
swap_list_unlock();
goto out_dput;
}
if (prev < 0) {
swap_list.head = p->next;
} else {
swap_info[prev].next = p->next;
}
if (type == swap_list.next) {
/* just pick something that's safe... */
swap_list.next = swap_list.head;
}
nr_swap_pages -= p->pages;
total_swap_pages -= p->pages;
p->flags &= ~SWP_WRITEOK;
swap_list_unlock();
current->flags |= PF_SWAPOFF;
err = try_to_unuse(type);
current->flags &= ~PF_SWAPOFF;
/* wait for any unplug function to finish */
down_write(&swap_unplug_sem);
up_write(&swap_unplug_sem);
if (err) {
/* re-insert swap space back into swap_list */
swap_list_lock();
for (prev = -1, i = swap_list.head; i >= 0; prev = i, i = swap_info[i].next)
if (p->prio >= swap_info[i].prio)
break;
p->next = i;
if (prev < 0)
swap_list.head = swap_list.next = p - swap_info;
else
swap_info[prev].next = p - swap_info;
nr_swap_pages += p->pages;
total_swap_pages += p->pages;
p->flags |= SWP_WRITEOK;
swap_list_unlock();
goto out_dput;
}
down(&swapon_sem);
swap_list_lock();
drain_mmlist();
swap_device_lock(p);
swap_file = p->swap_file;
p->swap_file = NULL;
p->max = 0;
swap_map = p->swap_map;
p->swap_map = NULL;
p->flags = 0;
destroy_swap_extents(p);
swap_device_unlock(p);
swap_list_unlock();
up(&swapon_sem);
vfree(swap_map);
inode = mapping->host;
if (S_ISBLK(inode->i_mode)) {
struct block_device *bdev = I_BDEV(inode);
set_blocksize(bdev, p->old_block_size);
bd_release(bdev);
} else {
down(&inode->i_sem);
inode->i_flags &= ~S_SWAPFILE;
up(&inode->i_sem);
}
filp_close(swap_file, NULL);
err = 0;
out_dput:
filp_close(victim, NULL);
out:
return err;
}
#ifdef CONFIG_PROC_FS
/* iterator */
static void *swap_start(struct seq_file *swap, loff_t *pos)
{
struct swap_info_struct *ptr = swap_info;
int i;
loff_t l = *pos;
down(&swapon_sem);
for (i = 0; i < nr_swapfiles; i++, ptr++) {
if (!(ptr->flags & SWP_USED) || !ptr->swap_map)
continue;
if (!l--)
return ptr;
}
return NULL;
}
static void *swap_next(struct seq_file *swap, void *v, loff_t *pos)
{
struct swap_info_struct *ptr = v;
struct swap_info_struct *endptr = swap_info + nr_swapfiles;
for (++ptr; ptr < endptr; ptr++) {
if (!(ptr->flags & SWP_USED) || !ptr->swap_map)
continue;
++*pos;
return ptr;
}
return NULL;
}
static void swap_stop(struct seq_file *swap, void *v)
{
up(&swapon_sem);
}
static int swap_show(struct seq_file *swap, void *v)
{
struct swap_info_struct *ptr = v;
struct file *file;
int len;
if (v == swap_info)
seq_puts(swap, "Filename\t\t\t\tType\t\tSize\tUsed\tPriority\n");
file = ptr->swap_file;
len = seq_path(swap, file->f_vfsmnt, file->f_dentry, " \t\n\\");
seq_printf(swap, "%*s%s\t%d\t%ld\t%d\n",
len < 40 ? 40 - len : 1, " ",
S_ISBLK(file->f_dentry->d_inode->i_mode) ?
"partition" : "file\t",
ptr->pages << (PAGE_SHIFT - 10),
ptr->inuse_pages << (PAGE_SHIFT - 10),
ptr->prio);
return 0;
}
static struct seq_operations swaps_op = {
.start = swap_start,
.next = swap_next,
.stop = swap_stop,
.show = swap_show
};
static int swaps_open(struct inode *inode, struct file *file)
{
return seq_open(file, &swaps_op);
}
static struct file_operations proc_swaps_operations = {
.open = swaps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int __init procswaps_init(void)
{
struct proc_dir_entry *entry;
entry = create_proc_entry("swaps", 0, NULL);
if (entry)
entry->proc_fops = &proc_swaps_operations;
return 0;
}
__initcall(procswaps_init);
#endif /* CONFIG_PROC_FS */
/*
* Written 01/25/92 by Simmule Turner, heavily changed by Linus.
*
* The swapon system call
*/
asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
{
struct swap_info_struct * p;
char *name = NULL;
struct block_device *bdev = NULL;
struct file *swap_file = NULL;
struct address_space *mapping;
unsigned int type;
int i, prev;
int error;
static int least_priority;
union swap_header *swap_header = NULL;
int swap_header_version;
int nr_good_pages = 0;
unsigned long maxpages = 1;
int swapfilesize;
unsigned short *swap_map;
struct page *page = NULL;
struct inode *inode = NULL;
int did_down = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
swap_list_lock();
p = swap_info;
for (type = 0 ; type < nr_swapfiles ; type++,p++)
if (!(p->flags & SWP_USED))
break;
error = -EPERM;
/*
* Test if adding another swap device is possible. There are
* two limiting factors: 1) the number of bits for the swap
* type swp_entry_t definition and 2) the number of bits for
* the swap type in the swap ptes as defined by the different
* architectures. To honor both limitations a swap entry
* with swap offset 0 and swap type ~0UL is created, encoded
* to a swap pte, decoded to a swp_entry_t again and finally
* the swap type part is extracted. This will mask all bits
* from the initial ~0UL that can't be encoded in either the
* swp_entry_t or the architecture definition of a swap pte.
*/
if (type > swp_type(pte_to_swp_entry(swp_entry_to_pte(swp_entry(~0UL,0))))) {
swap_list_unlock();
goto out;
}
if (type >= nr_swapfiles)
nr_swapfiles = type+1;
INIT_LIST_HEAD(&p->extent_list);
p->flags = SWP_USED;
p->nr_extents = 0;
p->swap_file = NULL;
p->old_block_size = 0;
p->swap_map = NULL;
p->lowest_bit = 0;
p->highest_bit = 0;
p->cluster_nr = 0;
p->inuse_pages = 0;
spin_lock_init(&p->sdev_lock);
p->next = -1;
if (swap_flags & SWAP_FLAG_PREFER) {
p->prio =
(swap_flags & SWAP_FLAG_PRIO_MASK)>>SWAP_FLAG_PRIO_SHIFT;
} else {
p->prio = --least_priority;
}
swap_list_unlock();
name = getname(specialfile);
error = PTR_ERR(name);
if (IS_ERR(name)) {
name = NULL;
goto bad_swap_2;
}
swap_file = filp_open(name, O_RDWR|O_LARGEFILE, 0);
error = PTR_ERR(swap_file);
if (IS_ERR(swap_file)) {
swap_file = NULL;
goto bad_swap_2;
}
p->swap_file = swap_file;
mapping = swap_file->f_mapping;
inode = mapping->host;
error = -EBUSY;
for (i = 0; i < nr_swapfiles; i++) {
struct swap_info_struct *q = &swap_info[i];
if (i == type || !q->swap_file)
continue;
if (mapping == q->swap_file->f_mapping)
goto bad_swap;
}
error = -EINVAL;
if (S_ISBLK(inode->i_mode)) {
bdev = I_BDEV(inode);
error = bd_claim(bdev, sys_swapon);
if (error < 0) {
bdev = NULL;
goto bad_swap;
}
p->old_block_size = block_size(bdev);
error = set_blocksize(bdev, PAGE_SIZE);
if (error < 0)
goto bad_swap;
p->bdev = bdev;
} else if (S_ISREG(inode->i_mode)) {
p->bdev = inode->i_sb->s_bdev;
down(&inode->i_sem);
did_down = 1;
if (IS_SWAPFILE(inode)) {
error = -EBUSY;
goto bad_swap;
}
} else {
goto bad_swap;
}
swapfilesize = i_size_read(inode) >> PAGE_SHIFT;
/*
* Read the swap header.
*/
if (!mapping->a_ops->readpage) {
error = -EINVAL;
goto bad_swap;
}
page = read_cache_page(mapping, 0,
(filler_t *)mapping->a_ops->readpage, swap_file);
if (IS_ERR(page)) {
error = PTR_ERR(page);
goto bad_swap;
}
wait_on_page_locked(page);
if (!PageUptodate(page))
goto bad_swap;
kmap(page);
swap_header = page_address(page);
if (!memcmp("SWAP-SPACE",swap_header->magic.magic,10))
swap_header_version = 1;
else if (!memcmp("SWAPSPACE2",swap_header->magic.magic,10))
swap_header_version = 2;
else {
printk("Unable to find swap-space signature\n");
error = -EINVAL;
goto bad_swap;
}
switch (swap_header_version) {
case 1:
printk(KERN_ERR "version 0 swap is no longer supported. "
"Use mkswap -v1 %s\n", name);
error = -EINVAL;
goto bad_swap;
case 2:
/* Check the swap header's sub-version and the size of
the swap file and bad block lists */
if (swap_header->info.version != 1) {
printk(KERN_WARNING
"Unable to handle swap header version %d\n",
swap_header->info.version);
error = -EINVAL;
goto bad_swap;
}
p->lowest_bit = 1;
/*
* Find out how many pages are allowed for a single swap
* device. There are two limiting factors: 1) the number of
* bits for the swap offset in the swp_entry_t type and
* 2) the number of bits in the a swap pte as defined by
* the different architectures. In order to find the
* largest possible bit mask a swap entry with swap type 0
* and swap offset ~0UL is created, encoded to a swap pte,
* decoded to a swp_entry_t again and finally the swap
* offset is extracted. This will mask all the bits from
* the initial ~0UL mask that can't be encoded in either
* the swp_entry_t or the architecture definition of a
* swap pte.
*/
maxpages = swp_offset(pte_to_swp_entry(swp_entry_to_pte(swp_entry(0,~0UL)))) - 1;
if (maxpages > swap_header->info.last_page)
maxpages = swap_header->info.last_page;
p->highest_bit = maxpages - 1;
error = -EINVAL;
if (swap_header->info.nr_badpages > MAX_SWAP_BADPAGES)
goto bad_swap;
/* OK, set up the swap map and apply the bad block list */
if (!(p->swap_map = vmalloc(maxpages * sizeof(short)))) {
error = -ENOMEM;
goto bad_swap;
}
error = 0;
memset(p->swap_map, 0, maxpages * sizeof(short));
for (i=0; i<swap_header->info.nr_badpages; i++) {
int page = swap_header->info.badpages[i];
if (page <= 0 || page >= swap_header->info.last_page)
error = -EINVAL;
else
p->swap_map[page] = SWAP_MAP_BAD;
}
nr_good_pages = swap_header->info.last_page -
swap_header->info.nr_badpages -
1 /* header page */;
if (error)
goto bad_swap;
}
if (swapfilesize && maxpages > swapfilesize) {
printk(KERN_WARNING
"Swap area shorter than signature indicates\n");
error = -EINVAL;
goto bad_swap;
}
if (!nr_good_pages) {
printk(KERN_WARNING "Empty swap-file\n");
error = -EINVAL;
goto bad_swap;
}
p->swap_map[0] = SWAP_MAP_BAD;
p->max = maxpages;
p->pages = nr_good_pages;
error = setup_swap_extents(p);
if (error)
goto bad_swap;
down(&swapon_sem);
swap_list_lock();
swap_device_lock(p);
p->flags = SWP_ACTIVE;
nr_swap_pages += nr_good_pages;
total_swap_pages += nr_good_pages;
printk(KERN_INFO "Adding %dk swap on %s. Priority:%d extents:%d\n",
nr_good_pages<<(PAGE_SHIFT-10), name,
p->prio, p->nr_extents);
/* insert swap space into swap_list: */
prev = -1;
for (i = swap_list.head; i >= 0; i = swap_info[i].next) {
if (p->prio >= swap_info[i].prio) {
break;
}
prev = i;
}
p->next = i;
if (prev < 0) {
swap_list.head = swap_list.next = p - swap_info;
} else {
swap_info[prev].next = p - swap_info;
}
swap_device_unlock(p);
swap_list_unlock();
up(&swapon_sem);
error = 0;
goto out;
bad_swap:
if (bdev) {
set_blocksize(bdev, p->old_block_size);
bd_release(bdev);
}
bad_swap_2:
swap_list_lock();
swap_map = p->swap_map;
p->swap_file = NULL;
p->swap_map = NULL;
p->flags = 0;
if (!(swap_flags & SWAP_FLAG_PREFER))
++least_priority;
swap_list_unlock();
destroy_swap_extents(p);
vfree(swap_map);
if (swap_file)
filp_close(swap_file, NULL);
out:
if (page && !IS_ERR(page)) {
kunmap(page);
page_cache_release(page);
}
if (name)
putname(name);
if (did_down) {
if (!error)
inode->i_flags |= S_SWAPFILE;
up(&inode->i_sem);
}
return error;
}
void si_swapinfo(struct sysinfo *val)
{
unsigned int i;
unsigned long nr_to_be_unused = 0;
swap_list_lock();
for (i = 0; i < nr_swapfiles; i++) {
if (!(swap_info[i].flags & SWP_USED) ||
(swap_info[i].flags & SWP_WRITEOK))
continue;
nr_to_be_unused += swap_info[i].inuse_pages;
}
val->freeswap = nr_swap_pages + nr_to_be_unused;
val->totalswap = total_swap_pages + nr_to_be_unused;
swap_list_unlock();
}
/*
* Verify that a swap entry is valid and increment its swap map count.
*
* Note: if swap_map[] reaches SWAP_MAP_MAX the entries are treated as
* "permanent", but will be reclaimed by the next swapoff.
*/
int swap_duplicate(swp_entry_t entry)
{
struct swap_info_struct * p;
unsigned long offset, type;
int result = 0;
type = swp_type(entry);
if (type >= nr_swapfiles)
goto bad_file;
p = type + swap_info;
offset = swp_offset(entry);
swap_device_lock(p);
if (offset < p->max && p->swap_map[offset]) {
if (p->swap_map[offset] < SWAP_MAP_MAX - 1) {
p->swap_map[offset]++;
result = 1;
} else if (p->swap_map[offset] <= SWAP_MAP_MAX) {
if (swap_overflow++ < 5)
printk(KERN_WARNING "swap_dup: swap entry overflow\n");
p->swap_map[offset] = SWAP_MAP_MAX;
result = 1;
}
}
swap_device_unlock(p);
out:
return result;
bad_file:
printk(KERN_ERR "swap_dup: %s%08lx\n", Bad_file, entry.val);
goto out;
}
struct swap_info_struct *
get_swap_info_struct(unsigned type)
{
return &swap_info[type];
}
/*
* swap_device_lock prevents swap_map being freed. Don't grab an extra
* reference on the swaphandle, it doesn't matter if it becomes unused.
*/
int valid_swaphandles(swp_entry_t entry, unsigned long *offset)
{
int ret = 0, i = 1 << page_cluster;
unsigned long toff;
struct swap_info_struct *swapdev = swp_type(entry) + swap_info;
if (!page_cluster) /* no readahead */
return 0;
toff = (swp_offset(entry) >> page_cluster) << page_cluster;
if (!toff) /* first page is swap header */
toff++, i--;
*offset = toff;
swap_device_lock(swapdev);
do {
/* Don't read-ahead past the end of the swap area */
if (toff >= swapdev->max)
break;
/* Don't read in free or bad pages */
if (!swapdev->swap_map[toff])
break;
if (swapdev->swap_map[toff] == SWAP_MAP_BAD)
break;
toff++;
ret++;
} while (--i);
swap_device_unlock(swapdev);
return ret;
}
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