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[PATCH] swsusp: use block device offsets to identify swap locations
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Make swsusp use block device offsets instead of swap offsets to identify swap
locations and make it use the same code paths for writing as well as for
reading data.

This allows us to use the same code for handling swap files and swap
partitions and to simplify the code, eg.  by dropping rw_swap_page_sync().

Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: Pavel Machek <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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@rjwysocki
rjwysocki authored and Linus Torvalds committed Dec 7, 2006
1 parent 3fc6b34 commit 3aef83e
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Showing 7 changed files with 98 additions and 119 deletions.
3 changes: 1 addition & 2 deletions include/linux/swap.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -218,8 +218,6 @@ extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
/* linux/mm/page_io.c */
extern int swap_readpage(struct file *, struct page *);
extern int swap_writepage(struct page *page, struct writeback_control *wbc);
extern int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
struct bio **bio_chain);
extern int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err);

/* linux/mm/swap_state.c */
Expand Down Expand Up @@ -250,6 +248,7 @@ extern void free_swap_and_cache(swp_entry_t);
extern int swap_type_of(dev_t, sector_t);
extern unsigned int count_swap_pages(int, int);
extern sector_t map_swap_page(struct swap_info_struct *, pgoff_t);
extern sector_t swapdev_block(int, pgoff_t);
extern struct swap_info_struct *get_swap_info_struct(unsigned);
extern int can_share_swap_page(struct page *);
extern int remove_exclusive_swap_page(struct page *);
Expand Down
2 changes: 1 addition & 1 deletion kernel/power/power.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -146,7 +146,7 @@ struct bitmap_page {

extern void free_bitmap(struct bitmap_page *bitmap);
extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
extern sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap);
extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);

extern int swsusp_check(void);
Expand Down
133 changes: 70 additions & 63 deletions kernel/power/swap.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,8 @@ extern char resume_file[];
#define SWSUSP_SIG "S1SUSPEND"

static struct swsusp_header {
char reserved[PAGE_SIZE - 20 - sizeof(swp_entry_t)];
swp_entry_t image;
char reserved[PAGE_SIZE - 20 - sizeof(sector_t)];
sector_t image;
char orig_sig[10];
char sig[10];
} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
Expand Down Expand Up @@ -100,9 +100,9 @@ static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
return submit(READ, page_off, virt_to_page(addr), bio_chain);
}

static int bio_write_page(pgoff_t page_off, void *addr)
static int bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
{
return submit(WRITE, page_off, virt_to_page(addr), NULL);
return submit(WRITE, page_off, virt_to_page(addr), bio_chain);
}

static int wait_on_bio_chain(struct bio **bio_chain)
Expand Down Expand Up @@ -157,22 +157,19 @@ static void show_speed(struct timeval *start, struct timeval *stop,
* Saving part
*/

static int mark_swapfiles(swp_entry_t start)
static int mark_swapfiles(sector_t start)
{
int error;

rw_swap_page_sync(READ, swp_entry(root_swap, 0),
virt_to_page((unsigned long)&swsusp_header), NULL);
bio_read_page(0, &swsusp_header, NULL);
if (!memcmp("SWAP-SPACE",swsusp_header.sig, 10) ||
!memcmp("SWAPSPACE2",swsusp_header.sig, 10)) {
memcpy(swsusp_header.orig_sig,swsusp_header.sig, 10);
memcpy(swsusp_header.sig,SWSUSP_SIG, 10);
swsusp_header.image = start;
error = rw_swap_page_sync(WRITE, swp_entry(root_swap, 0),
virt_to_page((unsigned long)&swsusp_header),
NULL);
error = bio_write_page(0, &swsusp_header, NULL);
} else {
pr_debug("swsusp: Partition is not swap space.\n");
printk(KERN_ERR "swsusp: Swap header not found!\n");
error = -ENODEV;
}
return error;
Expand All @@ -185,12 +182,21 @@ static int mark_swapfiles(swp_entry_t start)

static int swsusp_swap_check(void) /* This is called before saving image */
{
int res = swap_type_of(swsusp_resume_device, 0);
int res;

res = swap_type_of(swsusp_resume_device, 0);
if (res < 0)
return res;

root_swap = res;
resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_WRITE);
if (IS_ERR(resume_bdev))
return PTR_ERR(resume_bdev);

res = set_blocksize(resume_bdev, PAGE_SIZE);
if (res < 0)
blkdev_put(resume_bdev);

if (res >= 0) {
root_swap = res;
return 0;
}
return res;
}

Expand All @@ -201,36 +207,26 @@ static int swsusp_swap_check(void) /* This is called before saving image */
* @bio_chain: Link the next write BIO here
*/

static int write_page(void *buf, unsigned long offset, struct bio **bio_chain)
static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
{
swp_entry_t entry;
int error = -ENOSPC;

if (offset) {
struct page *page = virt_to_page(buf);

if (bio_chain) {
/*
* Whether or not we successfully allocated a copy page,
* we take a ref on the page here. It gets undone in
* wait_on_bio_chain().
*/
struct page *page_copy;
page_copy = alloc_page(GFP_ATOMIC);
if (page_copy == NULL) {
WARN_ON_ONCE(1);
bio_chain = NULL; /* Go synchronous */
get_page(page);
} else {
memcpy(page_address(page_copy),
page_address(page), PAGE_SIZE);
page = page_copy;
}
void *src;

if (!offset)
return -ENOSPC;

if (bio_chain) {
src = (void *)__get_free_page(GFP_ATOMIC);
if (src) {
memcpy(src, buf, PAGE_SIZE);
} else {
WARN_ON_ONCE(1);
bio_chain = NULL; /* Go synchronous */
src = buf;
}
entry = swp_entry(root_swap, offset);
error = rw_swap_page_sync(WRITE, entry, page, bio_chain);
} else {
src = buf;
}
return error;
return bio_write_page(offset, src, bio_chain);
}

/*
Expand All @@ -248,11 +244,11 @@ static int write_page(void *buf, unsigned long offset, struct bio **bio_chain)
* at a time.
*/

#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(long) - 1)
#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)

struct swap_map_page {
unsigned long entries[MAP_PAGE_ENTRIES];
unsigned long next_swap;
sector_t entries[MAP_PAGE_ENTRIES];
sector_t next_swap;
};

/**
Expand All @@ -262,7 +258,7 @@ struct swap_map_page {

struct swap_map_handle {
struct swap_map_page *cur;
unsigned long cur_swap;
sector_t cur_swap;
struct bitmap_page *bitmap;
unsigned int k;
};
Expand All @@ -287,7 +283,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
release_swap_writer(handle);
return -ENOMEM;
}
handle->cur_swap = alloc_swap_page(root_swap, handle->bitmap);
handle->cur_swap = alloc_swapdev_block(root_swap, handle->bitmap);
if (!handle->cur_swap) {
release_swap_writer(handle);
return -ENOSPC;
Expand All @@ -300,11 +296,11 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
struct bio **bio_chain)
{
int error = 0;
unsigned long offset;
sector_t offset;

if (!handle->cur)
return -EINVAL;
offset = alloc_swap_page(root_swap, handle->bitmap);
offset = alloc_swapdev_block(root_swap, handle->bitmap);
error = write_page(buf, offset, bio_chain);
if (error)
return error;
Expand All @@ -313,7 +309,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
error = wait_on_bio_chain(bio_chain);
if (error)
goto out;
offset = alloc_swap_page(root_swap, handle->bitmap);
offset = alloc_swapdev_block(root_swap, handle->bitmap);
if (!offset)
return -ENOSPC;
handle->cur->next_swap = offset;
Expand Down Expand Up @@ -413,37 +409,47 @@ int swsusp_write(void)
struct swsusp_info *header;
int error;

if ((error = swsusp_swap_check())) {
error = swsusp_swap_check();
if (error) {
printk(KERN_ERR "swsusp: Cannot find swap device, try "
"swapon -a.\n");
return error;
}
memset(&snapshot, 0, sizeof(struct snapshot_handle));
error = snapshot_read_next(&snapshot, PAGE_SIZE);
if (error < PAGE_SIZE)
return error < 0 ? error : -EFAULT;
if (error < PAGE_SIZE) {
if (error >= 0)
error = -EFAULT;

goto out;
}
header = (struct swsusp_info *)data_of(snapshot);
if (!enough_swap(header->pages)) {
printk(KERN_ERR "swsusp: Not enough free swap\n");
return -ENOSPC;
error = -ENOSPC;
goto out;
}
error = get_swap_writer(&handle);
if (!error) {
unsigned long start = handle.cur_swap;
sector_t start = handle.cur_swap;

error = swap_write_page(&handle, header, NULL);
if (!error)
error = save_image(&handle, &snapshot,
header->pages - 1);

if (!error) {
flush_swap_writer(&handle);
printk("S");
error = mark_swapfiles(swp_entry(root_swap, start));
error = mark_swapfiles(start);
printk("|\n");
}
}
if (error)
free_all_swap_pages(root_swap, handle.bitmap);
release_swap_writer(&handle);
out:
swsusp_close();
return error;
}

Expand All @@ -459,17 +465,18 @@ static void release_swap_reader(struct swap_map_handle *handle)
handle->cur = NULL;
}

static int get_swap_reader(struct swap_map_handle *handle,
swp_entry_t start)
static int get_swap_reader(struct swap_map_handle *handle, sector_t start)
{
int error;

if (!swp_offset(start))
if (!start)
return -EINVAL;

handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_ATOMIC);
if (!handle->cur)
return -ENOMEM;
error = bio_read_page(swp_offset(start), handle->cur, NULL);

error = bio_read_page(start, handle->cur, NULL);
if (error) {
release_swap_reader(handle);
return error;
Expand All @@ -481,7 +488,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
static int swap_read_page(struct swap_map_handle *handle, void *buf,
struct bio **bio_chain)
{
unsigned long offset;
sector_t offset;
int error;

if (!handle->cur)
Expand Down Expand Up @@ -608,7 +615,7 @@ int swsusp_check(void)
if (!memcmp(SWSUSP_SIG, swsusp_header.sig, 10)) {
memcpy(swsusp_header.sig, swsusp_header.orig_sig, 10);
/* Reset swap signature now */
error = bio_write_page(0, &swsusp_header);
error = bio_write_page(0, &swsusp_header, NULL);
} else {
return -EINVAL;
}
Expand Down
10 changes: 5 additions & 5 deletions kernel/power/swsusp.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -134,18 +134,18 @@ static int bitmap_set(struct bitmap_page *bitmap, unsigned long bit)
return 0;
}

unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap)
sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap)
{
unsigned long offset;

offset = swp_offset(get_swap_page_of_type(swap));
if (offset) {
if (bitmap_set(bitmap, offset)) {
if (bitmap_set(bitmap, offset))
swap_free(swp_entry(swap, offset));
offset = 0;
}
else
return swapdev_block(swap, offset);
}
return offset;
return 0;
}

void free_all_swap_pages(int swap, struct bitmap_page *bitmap)
Expand Down
7 changes: 4 additions & 3 deletions kernel/power/user.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -126,7 +126,8 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
{
int error = 0;
struct snapshot_data *data;
loff_t offset, avail;
loff_t avail;
sector_t offset;

if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
return -ENOTTY;
Expand Down Expand Up @@ -240,10 +241,10 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
break;
}
}
offset = alloc_swap_page(data->swap, data->bitmap);
offset = alloc_swapdev_block(data->swap, data->bitmap);
if (offset) {
offset <<= PAGE_SHIFT;
error = put_user(offset, (loff_t __user *)arg);
error = put_user(offset, (sector_t __user *)arg);
} else {
error = -ENOSPC;
}
Expand Down
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