diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/swsusp.c | 128 |
1 files changed, 36 insertions, 92 deletions
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c index d760a6a719f..0479c9be7d7 100644 --- a/kernel/power/swsusp.c +++ b/kernel/power/swsusp.c @@ -104,13 +104,7 @@ static struct swsusp_info swsusp_info; * Saving part... */ -/* We memorize in swapfile_used what swap devices are used for suspension */ -#define SWAPFILE_UNUSED 0 -#define SWAPFILE_SUSPEND 1 /* This is the suspending device */ -#define SWAPFILE_IGNORED 2 /* Those are other swap devices ignored for suspension */ - -static unsigned short swapfile_used[MAX_SWAPFILES]; -static unsigned short root_swap; +static unsigned short root_swap = 0xffff; static int mark_swapfiles(swp_entry_t prev) { @@ -146,7 +140,7 @@ static int mark_swapfiles(swp_entry_t prev) * devfs, since the resume code can only recognize the form /dev/hda4, * but the suspend code would see the long name.) */ -static int is_resume_device(const struct swap_info_struct *swap_info) +static inline int is_resume_device(const struct swap_info_struct *swap_info) { struct file *file = swap_info->swap_file; struct inode *inode = file->f_dentry->d_inode; @@ -157,54 +151,22 @@ static int is_resume_device(const struct swap_info_struct *swap_info) static int swsusp_swap_check(void) /* This is called before saving image */ { - int i, len; - - len=strlen(resume_file); - root_swap = 0xFFFF; - - spin_lock(&swap_lock); - for (i=0; i<MAX_SWAPFILES; i++) { - if (!(swap_info[i].flags & SWP_WRITEOK)) { - swapfile_used[i]=SWAPFILE_UNUSED; - } else { - if (!len) { - printk(KERN_WARNING "resume= option should be used to set suspend device" ); - if (root_swap == 0xFFFF) { - swapfile_used[i] = SWAPFILE_SUSPEND; - root_swap = i; - } else - swapfile_used[i] = SWAPFILE_IGNORED; - } else { - /* we ignore all swap devices that are not the resume_file */ - if (is_resume_device(&swap_info[i])) { - swapfile_used[i] = SWAPFILE_SUSPEND; - root_swap = i; - } else { - swapfile_used[i] = SWAPFILE_IGNORED; - } - } - } - } - spin_unlock(&swap_lock); - return (root_swap != 0xffff) ? 0 : -ENODEV; -} - -/** - * This is called after saving image so modification - * will be lost after resume... and that's what we want. - * we make the device unusable. A new call to - * lock_swapdevices can unlock the devices. - */ -static void lock_swapdevices(void) -{ int i; + if (!swsusp_resume_device) + return -ENODEV; spin_lock(&swap_lock); - for (i = 0; i< MAX_SWAPFILES; i++) - if (swapfile_used[i] == SWAPFILE_IGNORED) { - swap_info[i].flags ^= SWP_WRITEOK; + for (i = 0; i < MAX_SWAPFILES; i++) { + if (!(swap_info[i].flags & SWP_WRITEOK)) + continue; + if (is_resume_device(swap_info + i)) { + spin_unlock(&swap_lock); + root_swap = i; + return 0; } + } spin_unlock(&swap_lock); + return -ENODEV; } /** @@ -222,19 +184,14 @@ static void lock_swapdevices(void) static int write_page(unsigned long addr, swp_entry_t *loc) { swp_entry_t entry; - int error = 0; + int error = -ENOSPC; - entry = get_swap_page(); - if (swp_offset(entry) && - swapfile_used[swp_type(entry)] == SWAPFILE_SUSPEND) { - error = rw_swap_page_sync(WRITE, entry, - virt_to_page(addr)); - if (error == -EIO) - error = 0; - if (!error) + entry = get_swap_page_of_type(root_swap); + if (swp_offset(entry)) { + error = rw_swap_page_sync(WRITE, entry, virt_to_page(addr)); + if (!error || error == -EIO) *loc = entry; - } else - error = -ENOSPC; + } return error; } @@ -539,31 +496,38 @@ static int save_image_metadata(struct pbe *pblist, * enough_swap - Make sure we have enough swap to save the image. * * Returns TRUE or FALSE after checking the total amount of swap - * space avaiable. - * - * FIXME: si_swapinfo(&i) returns all swap devices information. - * We should only consider resume_device. + * space avaiable from the resume partition. */ static int enough_swap(unsigned int nr_pages) { - struct sysinfo i; + unsigned int free_swap = swap_info[root_swap].pages - + swap_info[root_swap].inuse_pages; - si_swapinfo(&i); - pr_debug("swsusp: available swap: %lu pages\n", i.freeswap); - return i.freeswap > (nr_pages + PAGES_FOR_IO + + pr_debug("swsusp: free swap pages: %u\n", free_swap); + return free_swap > (nr_pages + PAGES_FOR_IO + (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE); } /** - * write_suspend_image - Write entire image and metadata. + * swsusp_write - Write entire image and metadata. + * + * It is important _NOT_ to umount filesystems at this point. We want + * them synced (in case something goes wrong) but we DO not want to mark + * filesystem clean: it is not. (And it does not matter, if we resume + * correctly, we'll mark system clean, anyway.) */ -static int write_suspend_image(struct pbe *pblist, unsigned int nr_pages) + +int swsusp_write(struct pbe *pblist, unsigned int nr_pages) { struct swap_map_page *swap_map; struct swap_map_handle handle; int error; + if ((error = swsusp_swap_check())) { + printk(KERN_ERR "swsusp: Cannot find swap device, try swapon -a.\n"); + return error; + } if (!enough_swap(nr_pages)) { printk(KERN_ERR "swsusp: Not enough free swap\n"); return -ENOSPC; @@ -601,26 +565,6 @@ Free_image_entries: goto Free_swap_map; } -/* It is important _NOT_ to umount filesystems at this point. We want - * them synced (in case something goes wrong) but we DO not want to mark - * filesystem clean: it is not. (And it does not matter, if we resume - * correctly, we'll mark system clean, anyway.) - */ -int swsusp_write(struct pbe *pblist, unsigned int nr_pages) -{ - int error; - - if ((error = swsusp_swap_check())) { - printk(KERN_ERR "swsusp: cannot find swap device, try swapon -a.\n"); - return error; - } - lock_swapdevices(); - error = write_suspend_image(pblist, nr_pages); - /* This will unlock ignored swap devices since writing is finished */ - lock_swapdevices(); - return error; -} - /** * swsusp_shrink_memory - Try to free as much memory as needed * |