diff options
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r-- | mm/swapfile.c | 51 |
1 files changed, 24 insertions, 27 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 16de84b56644..fa5f10b9c28b 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c | |||
@@ -519,9 +519,9 @@ swp_entry_t get_swap_page_of_type(int type) | |||
519 | return (swp_entry_t) {0}; | 519 | return (swp_entry_t) {0}; |
520 | } | 520 | } |
521 | 521 | ||
522 | static struct swap_info_struct * swap_info_get(swp_entry_t entry) | 522 | static struct swap_info_struct *swap_info_get(swp_entry_t entry) |
523 | { | 523 | { |
524 | struct swap_info_struct * p; | 524 | struct swap_info_struct *p; |
525 | unsigned long offset, type; | 525 | unsigned long offset, type; |
526 | 526 | ||
527 | if (!entry.val) | 527 | if (!entry.val) |
@@ -599,7 +599,7 @@ static int swap_entry_free(struct swap_info_struct *p, | |||
599 | */ | 599 | */ |
600 | void swap_free(swp_entry_t entry) | 600 | void swap_free(swp_entry_t entry) |
601 | { | 601 | { |
602 | struct swap_info_struct * p; | 602 | struct swap_info_struct *p; |
603 | 603 | ||
604 | p = swap_info_get(entry); | 604 | p = swap_info_get(entry); |
605 | if (p) { | 605 | if (p) { |
@@ -629,7 +629,6 @@ void swapcache_free(swp_entry_t entry, struct page *page) | |||
629 | } | 629 | } |
630 | spin_unlock(&swap_lock); | 630 | spin_unlock(&swap_lock); |
631 | } | 631 | } |
632 | return; | ||
633 | } | 632 | } |
634 | 633 | ||
635 | /* | 634 | /* |
@@ -783,6 +782,21 @@ int swap_type_of(dev_t device, sector_t offset, struct block_device **bdev_p) | |||
783 | } | 782 | } |
784 | 783 | ||
785 | /* | 784 | /* |
785 | * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev | ||
786 | * corresponding to given index in swap_info (swap type). | ||
787 | */ | ||
788 | sector_t swapdev_block(int type, pgoff_t offset) | ||
789 | { | ||
790 | struct block_device *bdev; | ||
791 | |||
792 | if ((unsigned int)type >= nr_swapfiles) | ||
793 | return 0; | ||
794 | if (!(swap_info[type]->flags & SWP_WRITEOK)) | ||
795 | return 0; | ||
796 | return map_swap_page(swp_entry(type, offset), &bdev); | ||
797 | } | ||
798 | |||
799 | /* | ||
786 | * Return either the total number of swap pages of given type, or the number | 800 | * Return either the total number of swap pages of given type, or the number |
787 | * of free pages of that type (depending on @free) | 801 | * of free pages of that type (depending on @free) |
788 | * | 802 | * |
@@ -805,7 +819,7 @@ unsigned int count_swap_pages(int type, int free) | |||
805 | spin_unlock(&swap_lock); | 819 | spin_unlock(&swap_lock); |
806 | return n; | 820 | return n; |
807 | } | 821 | } |
808 | #endif | 822 | #endif /* CONFIG_HIBERNATION */ |
809 | 823 | ||
810 | /* | 824 | /* |
811 | * No need to decide whether this PTE shares the swap entry with others, | 825 | * No need to decide whether this PTE shares the swap entry with others, |
@@ -1316,23 +1330,6 @@ sector_t map_swap_page(swp_entry_t entry, struct block_device **bdev) | |||
1316 | } | 1330 | } |
1317 | } | 1331 | } |
1318 | 1332 | ||
1319 | #ifdef CONFIG_HIBERNATION | ||
1320 | /* | ||
1321 | * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev | ||
1322 | * corresponding to given index in swap_info (swap type). | ||
1323 | */ | ||
1324 | sector_t swapdev_block(int type, pgoff_t offset) | ||
1325 | { | ||
1326 | struct block_device *bdev; | ||
1327 | |||
1328 | if ((unsigned int)type >= nr_swapfiles) | ||
1329 | return 0; | ||
1330 | if (!(swap_info[type]->flags & SWP_WRITEOK)) | ||
1331 | return 0; | ||
1332 | return map_swap_page(swp_entry(type, offset), &bdev); | ||
1333 | } | ||
1334 | #endif /* CONFIG_HIBERNATION */ | ||
1335 | |||
1336 | /* | 1333 | /* |
1337 | * Free all of a swapdev's extent information | 1334 | * Free all of a swapdev's extent information |
1338 | */ | 1335 | */ |
@@ -1523,12 +1520,12 @@ bad_bmap: | |||
1523 | 1520 | ||
1524 | SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) | 1521 | SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) |
1525 | { | 1522 | { |
1526 | struct swap_info_struct * p = NULL; | 1523 | struct swap_info_struct *p = NULL; |
1527 | unsigned short *swap_map; | 1524 | unsigned short *swap_map; |
1528 | struct file *swap_file, *victim; | 1525 | struct file *swap_file, *victim; |
1529 | struct address_space *mapping; | 1526 | struct address_space *mapping; |
1530 | struct inode *inode; | 1527 | struct inode *inode; |
1531 | char * pathname; | 1528 | char *pathname; |
1532 | int i, type, prev; | 1529 | int i, type, prev; |
1533 | int err; | 1530 | int err; |
1534 | 1531 | ||
@@ -1780,7 +1777,7 @@ late_initcall(max_swapfiles_check); | |||
1780 | */ | 1777 | */ |
1781 | SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) | 1778 | SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) |
1782 | { | 1779 | { |
1783 | struct swap_info_struct * p; | 1780 | struct swap_info_struct *p; |
1784 | char *name = NULL; | 1781 | char *name = NULL; |
1785 | struct block_device *bdev = NULL; | 1782 | struct block_device *bdev = NULL; |
1786 | struct file *swap_file = NULL; | 1783 | struct file *swap_file = NULL; |
@@ -2116,7 +2113,7 @@ void si_swapinfo(struct sysinfo *val) | |||
2116 | */ | 2113 | */ |
2117 | static int __swap_duplicate(swp_entry_t entry, bool cache) | 2114 | static int __swap_duplicate(swp_entry_t entry, bool cache) |
2118 | { | 2115 | { |
2119 | struct swap_info_struct * p; | 2116 | struct swap_info_struct *p; |
2120 | unsigned long offset, type; | 2117 | unsigned long offset, type; |
2121 | int result = -EINVAL; | 2118 | int result = -EINVAL; |
2122 | int count; | 2119 | int count; |
@@ -2185,7 +2182,7 @@ void swap_duplicate(swp_entry_t entry) | |||
2185 | /* | 2182 | /* |
2186 | * @entry: swap entry for which we allocate swap cache. | 2183 | * @entry: swap entry for which we allocate swap cache. |
2187 | * | 2184 | * |
2188 | * Called when allocating swap cache for exising swap entry, | 2185 | * Called when allocating swap cache for existing swap entry, |
2189 | * This can return error codes. Returns 0 at success. | 2186 | * This can return error codes. Returns 0 at success. |
2190 | * -EBUSY means there is a swap cache. | 2187 | * -EBUSY means there is a swap cache. |
2191 | * Note: return code is different from swap_duplicate(). | 2188 | * Note: return code is different from swap_duplicate(). |