diff options
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 44 |
1 files changed, 30 insertions, 14 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 73521d39e985..d4da84ee3925 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -854,7 +854,6 @@ static void destroy_swap_extents(struct swap_info_struct *sis) list_del(&se->list); kfree(se); } - sis->nr_extents = 0; } /* @@ -893,8 +892,7 @@ add_swap_extent(struct swap_info_struct *sis, unsigned long start_page, new_se->start_block = start_block; list_add_tail(&new_se->list, &sis->extent_list); - sis->nr_extents++; - return 0; + return 1; } /* @@ -928,7 +926,7 @@ add_swap_extent(struct swap_info_struct *sis, unsigned long start_page, * 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) +static int setup_swap_extents(struct swap_info_struct *sis, sector_t *span) { struct inode *inode; unsigned blocks_per_page; @@ -936,11 +934,15 @@ static int setup_swap_extents(struct swap_info_struct *sis) unsigned blkbits; sector_t probe_block; sector_t last_block; + sector_t lowest_block = -1; + sector_t highest_block = 0; + int nr_extents = 0; int ret; inode = sis->swap_file->f_mapping->host; if (S_ISBLK(inode->i_mode)) { ret = add_swap_extent(sis, 0, sis->max, 0); + *span = sis->pages; goto done; } @@ -985,19 +987,28 @@ static int setup_swap_extents(struct swap_info_struct *sis) } } + first_block >>= (PAGE_SHIFT - blkbits); + if (page_no) { /* exclude the header page */ + if (first_block < lowest_block) + lowest_block = first_block; + if (first_block > highest_block) + highest_block = first_block; + } + /* * 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) + ret = add_swap_extent(sis, page_no, 1, first_block); + if (ret < 0) goto out; + nr_extents += ret; page_no++; probe_block += blocks_per_page; reprobe: continue; } - ret = 0; + ret = nr_extents; + *span = 1 + highest_block - lowest_block; if (page_no == 0) page_no = 1; /* force Empty message */ sis->max = page_no; @@ -1265,6 +1276,8 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) union swap_header *swap_header = NULL; int swap_header_version; int nr_good_pages = 0; + int nr_extents; + sector_t span; unsigned long maxpages = 1; int swapfilesize; unsigned short *swap_map; @@ -1300,7 +1313,6 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) 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; @@ -1477,9 +1489,11 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) p->swap_map[0] = SWAP_MAP_BAD; p->max = maxpages; p->pages = nr_good_pages; - error = setup_swap_extents(p); - if (error) + nr_extents = setup_swap_extents(p, &span); + if (nr_extents < 0) { + error = nr_extents; goto bad_swap; + } nr_good_pages = p->pages; } if (!nr_good_pages) { @@ -1494,9 +1508,11 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags) 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); + + printk(KERN_INFO "Adding %dk swap on %s. " + "Priority:%d extents:%d across:%lluk\n", + nr_good_pages<<(PAGE_SHIFT-10), name, p->prio, + nr_extents, (unsigned long long)span<<(PAGE_SHIFT-10)); /* insert swap space into swap_list: */ prev = -1; |