Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/page_io.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 5 | * |
| 6 | * Swap reorganised 29.12.95, |
| 7 | * Asynchronous swapping added 30.12.95. Stephen Tweedie |
| 8 | * Removed race in async swapping. 14.4.1996. Bruno Haible |
| 9 | * Add swap of shared pages through the page cache. 20.2.1998. Stephen Tweedie |
| 10 | * Always use brw_page, life becomes simpler. 12 May 1998 Eric Biederman |
| 11 | */ |
| 12 | |
| 13 | #include <linux/mm.h> |
| 14 | #include <linux/kernel_stat.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/pagemap.h> |
| 17 | #include <linux/swap.h> |
| 18 | #include <linux/bio.h> |
| 19 | #include <linux/swapops.h> |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 20 | #include <linux/buffer_head.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/writeback.h> |
Dan Magenheimer | 38b5faf | 2012-04-09 17:08:06 -0600 | [diff] [blame] | 22 | #include <linux/frontswap.h> |
Minchan Kim | b430e9d | 2013-07-03 15:01:24 -0700 | [diff] [blame] | 23 | #include <linux/blkdev.h> |
Christoph Hellwig | e2e40f2 | 2015-02-22 08:58:50 -0800 | [diff] [blame] | 24 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/pgtable.h> |
| 26 | |
Hugh Dickins | f29ad6a | 2009-12-14 17:58:40 -0800 | [diff] [blame] | 27 | static struct bio *get_swap_bio(gfp_t gfp_flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | struct page *page, bio_end_io_t end_io) |
| 29 | { |
| 30 | struct bio *bio; |
| 31 | |
| 32 | bio = bio_alloc(gfp_flags, 1); |
| 33 | if (bio) { |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 34 | bio->bi_iter.bi_sector = map_swap_page(page, &bio->bi_bdev); |
| 35 | bio->bi_iter.bi_sector <<= PAGE_SHIFT - 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | bio->bi_io_vec[0].bv_page = page; |
| 37 | bio->bi_io_vec[0].bv_len = PAGE_SIZE; |
| 38 | bio->bi_io_vec[0].bv_offset = 0; |
| 39 | bio->bi_vcnt = 1; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 40 | bio->bi_iter.bi_size = PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | bio->bi_end_io = end_io; |
| 42 | } |
| 43 | return bio; |
| 44 | } |
| 45 | |
Seth Jennings | 1eec670 | 2013-04-29 15:08:35 -0700 | [diff] [blame] | 46 | void end_swap_bio_write(struct bio *bio, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | { |
| 48 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 49 | struct page *page = bio->bi_io_vec[0].bv_page; |
| 50 | |
Peter Zijlstra | 6ddab3b | 2006-09-25 23:31:26 -0700 | [diff] [blame] | 51 | if (!uptodate) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | SetPageError(page); |
Peter Zijlstra | 6ddab3b | 2006-09-25 23:31:26 -0700 | [diff] [blame] | 53 | /* |
| 54 | * We failed to write the page out to swap-space. |
| 55 | * Re-dirty the page in order to avoid it being reclaimed. |
| 56 | * Also print a dire warning that things will go BAD (tm) |
| 57 | * very quickly. |
| 58 | * |
| 59 | * Also clear PG_reclaim to avoid rotate_reclaimable_page() |
| 60 | */ |
| 61 | set_page_dirty(page); |
| 62 | printk(KERN_ALERT "Write-error on swap-device (%u:%u:%Lu)\n", |
| 63 | imajor(bio->bi_bdev->bd_inode), |
| 64 | iminor(bio->bi_bdev->bd_inode), |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 65 | (unsigned long long)bio->bi_iter.bi_sector); |
Peter Zijlstra | 6ddab3b | 2006-09-25 23:31:26 -0700 | [diff] [blame] | 66 | ClearPageReclaim(page); |
| 67 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | end_page_writeback(page); |
| 69 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 72 | void end_swap_bio_read(struct bio *bio, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
| 74 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 75 | struct page *page = bio->bi_io_vec[0].bv_page; |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | if (!uptodate) { |
| 78 | SetPageError(page); |
| 79 | ClearPageUptodate(page); |
Peter Zijlstra | 6ddab3b | 2006-09-25 23:31:26 -0700 | [diff] [blame] | 80 | printk(KERN_ALERT "Read-error on swap-device (%u:%u:%Lu)\n", |
| 81 | imajor(bio->bi_bdev->bd_inode), |
| 82 | iminor(bio->bi_bdev->bd_inode), |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 83 | (unsigned long long)bio->bi_iter.bi_sector); |
Minchan Kim | b430e9d | 2013-07-03 15:01:24 -0700 | [diff] [blame] | 84 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
Minchan Kim | b430e9d | 2013-07-03 15:01:24 -0700 | [diff] [blame] | 86 | |
| 87 | SetPageUptodate(page); |
| 88 | |
| 89 | /* |
| 90 | * There is no guarantee that the page is in swap cache - the software |
| 91 | * suspend code (at least) uses end_swap_bio_read() against a non- |
| 92 | * swapcache page. So we must check PG_swapcache before proceeding with |
| 93 | * this optimization. |
| 94 | */ |
| 95 | if (likely(PageSwapCache(page))) { |
| 96 | struct swap_info_struct *sis; |
| 97 | |
| 98 | sis = page_swap_info(page); |
| 99 | if (sis->flags & SWP_BLKDEV) { |
| 100 | /* |
| 101 | * The swap subsystem performs lazy swap slot freeing, |
| 102 | * expecting that the page will be swapped out again. |
| 103 | * So we can avoid an unnecessary write if the page |
| 104 | * isn't redirtied. |
| 105 | * This is good for real swap storage because we can |
| 106 | * reduce unnecessary I/O and enhance wear-leveling |
| 107 | * if an SSD is used as the as swap device. |
| 108 | * But if in-memory swap device (eg zram) is used, |
| 109 | * this causes a duplicated copy between uncompressed |
| 110 | * data in VM-owned memory and compressed data in |
| 111 | * zram-owned memory. So let's free zram-owned memory |
| 112 | * and make the VM-owned decompressed page *dirty*, |
| 113 | * so the page should be swapped out somewhere again if |
| 114 | * we again wish to reclaim it. |
| 115 | */ |
| 116 | struct gendisk *disk = sis->bdev->bd_disk; |
| 117 | if (disk->fops->swap_slot_free_notify) { |
| 118 | swp_entry_t entry; |
| 119 | unsigned long offset; |
| 120 | |
| 121 | entry.val = page_private(page); |
| 122 | offset = swp_offset(entry); |
| 123 | |
| 124 | SetPageDirty(page); |
| 125 | disk->fops->swap_slot_free_notify(sis->bdev, |
| 126 | offset); |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | unlock_page(page); |
| 133 | bio_put(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Mel Gorman | a509bc1 | 2012-07-31 16:44:57 -0700 | [diff] [blame] | 136 | int generic_swapfile_activate(struct swap_info_struct *sis, |
| 137 | struct file *swap_file, |
| 138 | sector_t *span) |
| 139 | { |
| 140 | struct address_space *mapping = swap_file->f_mapping; |
| 141 | struct inode *inode = mapping->host; |
| 142 | unsigned blocks_per_page; |
| 143 | unsigned long page_no; |
| 144 | unsigned blkbits; |
| 145 | sector_t probe_block; |
| 146 | sector_t last_block; |
| 147 | sector_t lowest_block = -1; |
| 148 | sector_t highest_block = 0; |
| 149 | int nr_extents = 0; |
| 150 | int ret; |
| 151 | |
| 152 | blkbits = inode->i_blkbits; |
| 153 | blocks_per_page = PAGE_SIZE >> blkbits; |
| 154 | |
| 155 | /* |
| 156 | * Map all the blocks into the extent list. This code doesn't try |
| 157 | * to be very smart. |
| 158 | */ |
| 159 | probe_block = 0; |
| 160 | page_no = 0; |
| 161 | last_block = i_size_read(inode) >> blkbits; |
| 162 | while ((probe_block + blocks_per_page) <= last_block && |
| 163 | page_no < sis->max) { |
| 164 | unsigned block_in_page; |
| 165 | sector_t first_block; |
| 166 | |
| 167 | first_block = bmap(inode, probe_block); |
| 168 | if (first_block == 0) |
| 169 | goto bad_bmap; |
| 170 | |
| 171 | /* |
| 172 | * It must be PAGE_SIZE aligned on-disk |
| 173 | */ |
| 174 | if (first_block & (blocks_per_page - 1)) { |
| 175 | probe_block++; |
| 176 | goto reprobe; |
| 177 | } |
| 178 | |
| 179 | for (block_in_page = 1; block_in_page < blocks_per_page; |
| 180 | block_in_page++) { |
| 181 | sector_t block; |
| 182 | |
| 183 | block = bmap(inode, probe_block + block_in_page); |
| 184 | if (block == 0) |
| 185 | goto bad_bmap; |
| 186 | if (block != first_block + block_in_page) { |
| 187 | /* Discontiguity */ |
| 188 | probe_block++; |
| 189 | goto reprobe; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | first_block >>= (PAGE_SHIFT - blkbits); |
| 194 | if (page_no) { /* exclude the header page */ |
| 195 | if (first_block < lowest_block) |
| 196 | lowest_block = first_block; |
| 197 | if (first_block > highest_block) |
| 198 | highest_block = first_block; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * We found a PAGE_SIZE-length, PAGE_SIZE-aligned run of blocks |
| 203 | */ |
| 204 | ret = add_swap_extent(sis, page_no, 1, first_block); |
| 205 | if (ret < 0) |
| 206 | goto out; |
| 207 | nr_extents += ret; |
| 208 | page_no++; |
| 209 | probe_block += blocks_per_page; |
| 210 | reprobe: |
| 211 | continue; |
| 212 | } |
| 213 | ret = nr_extents; |
| 214 | *span = 1 + highest_block - lowest_block; |
| 215 | if (page_no == 0) |
| 216 | page_no = 1; /* force Empty message */ |
| 217 | sis->max = page_no; |
| 218 | sis->pages = page_no - 1; |
| 219 | sis->highest_bit = page_no - 1; |
| 220 | out: |
| 221 | return ret; |
| 222 | bad_bmap: |
| 223 | printk(KERN_ERR "swapon: swapfile has holes\n"); |
| 224 | ret = -EINVAL; |
| 225 | goto out; |
| 226 | } |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | /* |
| 229 | * We may have stale swap cache pages in memory: notice |
| 230 | * them here and get rid of the unnecessary final write. |
| 231 | */ |
| 232 | int swap_writepage(struct page *page, struct writeback_control *wbc) |
| 233 | { |
Seth Jennings | 2f772e6 | 2013-04-29 15:08:34 -0700 | [diff] [blame] | 234 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Hugh Dickins | a2c43ee | 2009-01-06 14:39:36 -0800 | [diff] [blame] | 236 | if (try_to_free_swap(page)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | unlock_page(page); |
| 238 | goto out; |
| 239 | } |
Konrad Rzeszutek Wilk | 165c8ae | 2012-05-15 11:32:15 -0400 | [diff] [blame] | 240 | if (frontswap_store(page) == 0) { |
Dan Magenheimer | 38b5faf | 2012-04-09 17:08:06 -0600 | [diff] [blame] | 241 | set_page_writeback(page); |
| 242 | unlock_page(page); |
| 243 | end_page_writeback(page); |
| 244 | goto out; |
| 245 | } |
Seth Jennings | 1eec670 | 2013-04-29 15:08:35 -0700 | [diff] [blame] | 246 | ret = __swap_writepage(page, wbc, end_swap_bio_write); |
Seth Jennings | 2f772e6 | 2013-04-29 15:08:34 -0700 | [diff] [blame] | 247 | out: |
| 248 | return ret; |
| 249 | } |
| 250 | |
Matthew Wilcox | dd6bd0d | 2014-06-04 16:07:48 -0700 | [diff] [blame] | 251 | static sector_t swap_page_sector(struct page *page) |
| 252 | { |
| 253 | return (sector_t)__page_file_index(page) << (PAGE_CACHE_SHIFT - 9); |
| 254 | } |
| 255 | |
Seth Jennings | 1eec670 | 2013-04-29 15:08:35 -0700 | [diff] [blame] | 256 | int __swap_writepage(struct page *page, struct writeback_control *wbc, |
| 257 | void (*end_write_func)(struct bio *, int)) |
Seth Jennings | 2f772e6 | 2013-04-29 15:08:34 -0700 | [diff] [blame] | 258 | { |
| 259 | struct bio *bio; |
Matthew Wilcox | dd6bd0d | 2014-06-04 16:07:48 -0700 | [diff] [blame] | 260 | int ret, rw = WRITE; |
Seth Jennings | 2f772e6 | 2013-04-29 15:08:34 -0700 | [diff] [blame] | 261 | struct swap_info_struct *sis = page_swap_info(page); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 262 | |
| 263 | if (sis->flags & SWP_FILE) { |
| 264 | struct kiocb kiocb; |
| 265 | struct file *swap_file = sis->swap_file; |
| 266 | struct address_space *mapping = swap_file->f_mapping; |
Al Viro | 62a8067 | 2014-04-04 23:12:29 -0400 | [diff] [blame] | 267 | struct bio_vec bv = { |
| 268 | .bv_page = page, |
| 269 | .bv_len = PAGE_SIZE, |
| 270 | .bv_offset = 0 |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 271 | }; |
Al Viro | 05afcb7 | 2015-01-23 01:08:07 -0500 | [diff] [blame] | 272 | struct iov_iter from; |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 273 | |
Al Viro | 05afcb7 | 2015-01-23 01:08:07 -0500 | [diff] [blame] | 274 | iov_iter_bvec(&from, ITER_BVEC | WRITE, &bv, 1, PAGE_SIZE); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 275 | init_sync_kiocb(&kiocb, swap_file); |
| 276 | kiocb.ki_pos = page_file_offset(page); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 277 | |
Mel Gorman | 0cdc444 | 2013-04-29 15:08:48 -0700 | [diff] [blame] | 278 | set_page_writeback(page); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 279 | unlock_page(page); |
Al Viro | 62a8067 | 2014-04-04 23:12:29 -0400 | [diff] [blame] | 280 | ret = mapping->a_ops->direct_IO(ITER_BVEC | WRITE, |
Al Viro | d8d3d94 | 2014-03-04 21:27:34 -0500 | [diff] [blame] | 281 | &kiocb, &from, |
| 282 | kiocb.ki_pos); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 283 | if (ret == PAGE_SIZE) { |
| 284 | count_vm_event(PSWPOUT); |
| 285 | ret = 0; |
Jerome Marchand | 2d30d31 | 2013-04-29 15:08:47 -0700 | [diff] [blame] | 286 | } else { |
Mel Gorman | 0cdc444 | 2013-04-29 15:08:48 -0700 | [diff] [blame] | 287 | /* |
| 288 | * In the case of swap-over-nfs, this can be a |
| 289 | * temporary failure if the system has limited |
| 290 | * memory for allocating transmit buffers. |
| 291 | * Mark the page dirty and avoid |
| 292 | * rotate_reclaimable_page but rate-limit the |
| 293 | * messages but do not flag PageError like |
| 294 | * the normal direct-to-bio case as it could |
| 295 | * be temporary. |
| 296 | */ |
Jerome Marchand | 2d30d31 | 2013-04-29 15:08:47 -0700 | [diff] [blame] | 297 | set_page_dirty(page); |
Mel Gorman | 0cdc444 | 2013-04-29 15:08:48 -0700 | [diff] [blame] | 298 | ClearPageReclaim(page); |
| 299 | pr_err_ratelimited("Write error on dio swapfile (%Lu)\n", |
| 300 | page_file_offset(page)); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 301 | } |
Mel Gorman | 0cdc444 | 2013-04-29 15:08:48 -0700 | [diff] [blame] | 302 | end_page_writeback(page); |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 303 | return ret; |
| 304 | } |
| 305 | |
Matthew Wilcox | dd6bd0d | 2014-06-04 16:07:48 -0700 | [diff] [blame] | 306 | ret = bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc); |
| 307 | if (!ret) { |
| 308 | count_vm_event(PSWPOUT); |
| 309 | return 0; |
| 310 | } |
| 311 | |
| 312 | ret = 0; |
Seth Jennings | 1eec670 | 2013-04-29 15:08:35 -0700 | [diff] [blame] | 313 | bio = get_swap_bio(GFP_NOIO, page, end_write_func); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | if (bio == NULL) { |
| 315 | set_page_dirty(page); |
| 316 | unlock_page(page); |
| 317 | ret = -ENOMEM; |
| 318 | goto out; |
| 319 | } |
| 320 | if (wbc->sync_mode == WB_SYNC_ALL) |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 321 | rw |= REQ_SYNC; |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 322 | count_vm_event(PSWPOUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | set_page_writeback(page); |
| 324 | unlock_page(page); |
| 325 | submit_bio(rw, bio); |
| 326 | out: |
| 327 | return ret; |
| 328 | } |
| 329 | |
Minchan Kim | aca8bf3 | 2009-06-16 15:33:02 -0700 | [diff] [blame] | 330 | int swap_readpage(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | struct bio *bio; |
| 333 | int ret = 0; |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 334 | struct swap_info_struct *sis = page_swap_info(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 336 | VM_BUG_ON_PAGE(!PageLocked(page), page); |
| 337 | VM_BUG_ON_PAGE(PageUptodate(page), page); |
Konrad Rzeszutek Wilk | 165c8ae | 2012-05-15 11:32:15 -0400 | [diff] [blame] | 338 | if (frontswap_load(page) == 0) { |
Dan Magenheimer | 38b5faf | 2012-04-09 17:08:06 -0600 | [diff] [blame] | 339 | SetPageUptodate(page); |
| 340 | unlock_page(page); |
| 341 | goto out; |
| 342 | } |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 343 | |
| 344 | if (sis->flags & SWP_FILE) { |
| 345 | struct file *swap_file = sis->swap_file; |
| 346 | struct address_space *mapping = swap_file->f_mapping; |
| 347 | |
| 348 | ret = mapping->a_ops->readpage(swap_file, page); |
| 349 | if (!ret) |
| 350 | count_vm_event(PSWPIN); |
| 351 | return ret; |
| 352 | } |
| 353 | |
Matthew Wilcox | dd6bd0d | 2014-06-04 16:07:48 -0700 | [diff] [blame] | 354 | ret = bdev_read_page(sis->bdev, swap_page_sector(page), page); |
| 355 | if (!ret) { |
| 356 | count_vm_event(PSWPIN); |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | ret = 0; |
Hugh Dickins | f29ad6a | 2009-12-14 17:58:40 -0800 | [diff] [blame] | 361 | bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | if (bio == NULL) { |
| 363 | unlock_page(page); |
| 364 | ret = -ENOMEM; |
| 365 | goto out; |
| 366 | } |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 367 | count_vm_event(PSWPIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | submit_bio(READ, bio); |
| 369 | out: |
| 370 | return ret; |
| 371 | } |
Mel Gorman | 62c230b | 2012-07-31 16:44:55 -0700 | [diff] [blame] | 372 | |
| 373 | int swap_set_page_dirty(struct page *page) |
| 374 | { |
| 375 | struct swap_info_struct *sis = page_swap_info(page); |
| 376 | |
| 377 | if (sis->flags & SWP_FILE) { |
| 378 | struct address_space *mapping = sis->swap_file->f_mapping; |
| 379 | return mapping->a_ops->set_page_dirty(page); |
| 380 | } else { |
| 381 | return __set_page_dirty_no_writeback(page); |
| 382 | } |
| 383 | } |