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Subject[PATCH 09/22] Hibernation: Stop passing swap_map_handle struct
Date
Stop passing the swap_map_handle struct around. It's a local (to the
file) variable and continuing to pass it around will create ugliness
as I work to disentangle swap specific functions from block i/o and
put them in separate files.

Signed-off-by: Nigel Cunningham <nigel@tuxonice.net>
---
kernel/power/swap.c | 135 ++++++++++++++++++++++++---------------------------
1 files changed, 64 insertions(+), 71 deletions(-)
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 0c87522..1df890f 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -63,6 +63,8 @@ struct swap_map_handle {
unsigned int k;
};

+static struct swap_map_handle handle;
+
static unsigned short root_swap = 0xffff;

struct swsusp_header {
@@ -173,7 +175,7 @@ char __nosavedata write_speed, read_speed;
* Saving part
*/

-static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
+static int mark_swapfiles(unsigned int flags)
{
int error;

@@ -183,7 +185,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
swsusp_header->write_speed = write_speed;
- swsusp_header->image = handle->first_sector;
+ swsusp_header->image = handle.first_sector;
swsusp_header->flags = flags;
error = hib_bio_write_page(swsusp_resume_block,
swsusp_header, NULL);
@@ -250,14 +252,14 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
return hib_bio_write_page(offset, src, bio_chain);
}

-static void release_swap_writer(struct swap_map_handle *handle)
+static void release_swap_writer(void)
{
- if (handle->cur)
- free_page((unsigned long)handle->cur);
- handle->cur = NULL;
+ if (handle.cur)
+ free_page((unsigned long)handle.cur);
+ handle.cur = NULL;
}

-static int get_swap_writer(struct swap_map_handle *handle, unsigned long pages)
+static int get_swap_writer(unsigned long pages)
{
int ret;

@@ -268,8 +270,8 @@ static int get_swap_writer(struct swap_map_handle *handle, unsigned long pages)
"swapon -a.\n");
return ret;
}
- handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
- if (!handle->cur) {
+ handle.cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
+ if (!handle.cur) {
ret = -ENOMEM;
goto err_close;
}
@@ -278,74 +280,72 @@ static int get_swap_writer(struct swap_map_handle *handle, unsigned long pages)
ret = -ENOSPC;
goto err_close;
}
- handle->cur_swap = hib_extent_next(&sector_extents);
- if (!handle->cur_swap) {
+ handle.cur_swap = hib_extent_next(&sector_extents);
+ if (!handle.cur_swap) {
ret = -ENOSPC;
goto err_rel;
}
- handle->k = 0;
- handle->first_sector = handle->cur_swap;
+ handle.k = 0;
+ handle.first_sector = handle.cur_swap;
return 0;
err_rel:
- release_swap_writer(handle);
+ release_swap_writer();
err_close:
swsusp_close(FMODE_WRITE);
return ret;
}

-static int swap_write_page(struct swap_map_handle *handle, void *buf,
- struct bio **bio_chain)
+static int swap_write_page(void *buf, struct bio **bio_chain)
{
int error = 0;
sector_t offset;

- if (!handle->cur)
+ if (!handle.cur)
return -EINVAL;
offset = hib_extent_next(&sector_extents);
error = write_page(buf, offset, bio_chain);
if (error)
return error;
- handle->cur->entries[handle->k++] = offset;
- if (handle->k >= MAP_PAGE_ENTRIES) {
+ handle.cur->entries[handle.k++] = offset;
+ if (handle.k >= MAP_PAGE_ENTRIES) {
error = hib_wait_on_bio_chain(bio_chain);
if (error)
goto out;
offset = hib_extent_next(&sector_extents);
if (!offset)
return -ENOSPC;
- handle->cur->next_swap = offset;
- error = write_page(handle->cur, handle->cur_swap, NULL);
+ handle.cur->next_swap = offset;
+ error = write_page(handle.cur, handle.cur_swap, NULL);
if (error)
goto out;
- memset(handle->cur, 0, PAGE_SIZE);
- handle->cur_swap = offset;
- handle->k = 0;
+ memset(handle.cur, 0, PAGE_SIZE);
+ handle.cur_swap = offset;
+ handle.k = 0;
}
out:
return error;
}

-static int flush_swap_writer(struct swap_map_handle *handle)
+static int flush_swap_writer(void)
{
- if (handle->cur && handle->cur_swap)
- return write_page(handle->cur, handle->cur_swap, NULL);
+ if (handle.cur && handle.cur_swap)
+ return write_page(handle.cur, handle.cur_swap, NULL);
else
return -EINVAL;
}

-static int swap_writer_finish(struct swap_map_handle *handle,
- unsigned int flags, int error)
+static int swap_writer_finish(unsigned int flags, int error)
{
if (!error) {
- flush_swap_writer(handle);
+ flush_swap_writer();
printk(KERN_INFO "PM: S");
- error = mark_swapfiles(handle, flags);
+ error = mark_swapfiles(flags);
printk("|\n");
}

if (error)
free_all_swap_pages(root_swap);
- release_swap_writer(handle);
+ release_swap_writer();
swsusp_close(FMODE_WRITE);

return error;
@@ -355,8 +355,7 @@ static int swap_writer_finish(struct swap_map_handle *handle,
* save_image - save the suspend image data
*/

-static int save_image(struct swap_map_handle *handle,
- struct snapshot_handle *snapshot,
+static int save_image(struct snapshot_handle *snapshot,
unsigned int nr_to_write)
{
unsigned int m;
@@ -380,7 +379,7 @@ static int save_image(struct swap_map_handle *handle,
ret = snapshot_read_next(snapshot);
if (ret <= 0)
break;
- ret = swap_write_page(handle, data_of(*snapshot), &bio);
+ ret = swap_write_page(data_of(*snapshot), &bio);
if (ret)
break;
if (!(nr_pages % m))
@@ -412,14 +411,13 @@ static int save_image(struct swap_map_handle *handle,

int swsusp_write(unsigned int flags)
{
- struct swap_map_handle handle;
struct snapshot_handle snapshot;
struct swsusp_info *header;
unsigned long pages;
int error;

pages = snapshot_get_image_size();
- error = get_swap_writer(&handle, pages);
+ error = get_swap_writer(pages);
if (error) {
printk(KERN_ERR "PM: Cannot get swap writer\n");
return error;
@@ -433,11 +431,11 @@ int swsusp_write(unsigned int flags)
goto out_finish;
}
header = (struct swsusp_info *)data_of(snapshot);
- error = swap_write_page(&handle, header, NULL);
+ error = swap_write_page(header, NULL);
if (!error)
- error = save_image(&handle, &snapshot, pages - 1);
+ error = save_image(&snapshot, pages - 1);
out_finish:
- error = swap_writer_finish(&handle, flags, error);
+ error = swap_writer_finish(flags, error);
return error;
}

@@ -446,15 +444,14 @@ out_finish:
* in a file-alike way
*/

-static void release_swap_reader(struct swap_map_handle *handle)
+static void release_swap_reader(void)
{
- if (handle->cur)
- free_page((unsigned long)handle->cur);
- handle->cur = NULL;
+ if (handle.cur)
+ free_page((unsigned long)handle.cur);
+ handle.cur = NULL;
}

-static int get_swap_reader(struct swap_map_handle *handle,
- unsigned int *flags_p)
+static int get_swap_reader(unsigned int *flags_p)
{
int error;

@@ -463,48 +460,47 @@ static int get_swap_reader(struct swap_map_handle *handle,
if (!swsusp_header->image) /* how can this happen? */
return -EINVAL;

- handle->cur = (struct swap_map_page *)get_zeroed_page(__GFP_WAIT | __GFP_HIGH);
- if (!handle->cur)
+ handle.cur = (struct swap_map_page *)get_zeroed_page(__GFP_WAIT | __GFP_HIGH);
+ if (!handle.cur)
return -ENOMEM;

- error = hib_bio_read_page(swsusp_header->image, handle->cur, NULL);
+ error = hib_bio_read_page(swsusp_header->image, handle.cur, NULL);
if (error) {
- release_swap_reader(handle);
+ release_swap_reader();
return error;
}
- handle->k = 0;
+ handle.k = 0;
return 0;
}

-static int swap_read_page(struct swap_map_handle *handle, void *buf,
- struct bio **bio_chain)
+static int swap_read_page(void *buf, struct bio **bio_chain)
{
sector_t offset;
int error;

- if (!handle->cur)
+ if (!handle.cur)
return -EINVAL;
- offset = handle->cur->entries[handle->k];
+ offset = handle.cur->entries[handle.k];
if (!offset)
return -EFAULT;
error = hib_bio_read_page(offset, buf, bio_chain);
if (error)
return error;
- if (++handle->k >= MAP_PAGE_ENTRIES) {
+ if (++handle.k >= MAP_PAGE_ENTRIES) {
error = hib_wait_on_bio_chain(bio_chain);
- handle->k = 0;
- offset = handle->cur->next_swap;
+ handle.k = 0;
+ offset = handle.cur->next_swap;
if (!offset)
- release_swap_reader(handle);
+ release_swap_reader();
else if (!error)
- error = hib_bio_read_page(offset, handle->cur, NULL);
+ error = hib_bio_read_page(offset, handle.cur, NULL);
}
return error;
}

-static int swap_reader_finish(struct swap_map_handle *handle)
+static int swap_reader_finish(void)
{
- release_swap_reader(handle);
+ release_swap_reader();

return 0;
}
@@ -515,9 +511,7 @@ static int swap_reader_finish(struct swap_map_handle *handle)
* (assume there are @nr_pages pages to load)
*/

-static int load_image(struct swap_map_handle *handle,
- struct snapshot_handle *snapshot,
- unsigned int nr_to_read)
+static int load_image(struct snapshot_handle *snapshot, unsigned int nr_to_read)
{
unsigned int m;
int error = 0;
@@ -540,7 +534,7 @@ static int load_image(struct swap_map_handle *handle,
error = snapshot_write_next(snapshot);
if (error <= 0)
break;
- error = swap_read_page(handle, data_of(*snapshot), &bio);
+ error = swap_read_page(data_of(*snapshot), &bio);
if (error)
break;
if (snapshot->sync_read)
@@ -576,7 +570,6 @@ static int load_image(struct swap_map_handle *handle,
int swsusp_read(unsigned int *flags_p)
{
int error;
- struct swap_map_handle handle;
struct snapshot_handle snapshot;
struct swsusp_info *header;

@@ -585,14 +578,14 @@ int swsusp_read(unsigned int *flags_p)
if (error < PAGE_SIZE)
return error < 0 ? error : -EFAULT;
header = (struct swsusp_info *)data_of(snapshot);
- error = get_swap_reader(&handle, flags_p);
+ error = get_swap_reader(flags_p);
if (error)
goto end;
if (!error)
- error = swap_read_page(&handle, header, NULL);
+ error = swap_read_page(header, NULL);
if (!error)
- error = load_image(&handle, &snapshot, header->pages - 1);
- swap_reader_finish(&handle);
+ error = load_image(&snapshot, header->pages - 1);
+ swap_reader_finish();
end:
if (!error)
pr_debug("PM: Image successfully loaded\n");
--
1.7.0.4


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