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-rw-r--r--fs/btrfs/disk-io.c79
1 files changed, 0 insertions, 79 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e1aa8d607bc7..ada1f6bd0a57 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -847,7 +847,6 @@ static const struct address_space_operations btree_aops = {
847 .writepages = btree_writepages, 847 .writepages = btree_writepages,
848 .releasepage = btree_releasepage, 848 .releasepage = btree_releasepage,
849 .invalidatepage = btree_invalidatepage, 849 .invalidatepage = btree_invalidatepage,
850 .sync_page = block_sync_page,
851#ifdef CONFIG_MIGRATION 850#ifdef CONFIG_MIGRATION
852 .migratepage = btree_migratepage, 851 .migratepage = btree_migratepage,
853#endif 852#endif
@@ -1331,82 +1330,6 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1331} 1330}
1332 1331
1333/* 1332/*
1334 * this unplugs every device on the box, and it is only used when page
1335 * is null
1336 */
1337static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1338{
1339 struct btrfs_device *device;
1340 struct btrfs_fs_info *info;
1341
1342 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
1343 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
1344 if (!device->bdev)
1345 continue;
1346
1347 bdi = blk_get_backing_dev_info(device->bdev);
1348 if (bdi->unplug_io_fn)
1349 bdi->unplug_io_fn(bdi, page);
1350 }
1351}
1352
1353static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1354{
1355 struct inode *inode;
1356 struct extent_map_tree *em_tree;
1357 struct extent_map *em;
1358 struct address_space *mapping;
1359 u64 offset;
1360
1361 /* the generic O_DIRECT read code does this */
1362 if (1 || !page) {
1363 __unplug_io_fn(bdi, page);
1364 return;
1365 }
1366
1367 /*
1368 * page->mapping may change at any time. Get a consistent copy
1369 * and use that for everything below
1370 */
1371 smp_mb();
1372 mapping = page->mapping;
1373 if (!mapping)
1374 return;
1375
1376 inode = mapping->host;
1377
1378 /*
1379 * don't do the expensive searching for a small number of
1380 * devices
1381 */
1382 if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
1383 __unplug_io_fn(bdi, page);
1384 return;
1385 }
1386
1387 offset = page_offset(page);
1388
1389 em_tree = &BTRFS_I(inode)->extent_tree;
1390 read_lock(&em_tree->lock);
1391 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
1392 read_unlock(&em_tree->lock);
1393 if (!em) {
1394 __unplug_io_fn(bdi, page);
1395 return;
1396 }
1397
1398 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1399 free_extent_map(em);
1400 __unplug_io_fn(bdi, page);
1401 return;
1402 }
1403 offset = offset - em->start;
1404 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
1405 em->block_start + offset, page);
1406 free_extent_map(em);
1407}
1408
1409/*
1410 * If this fails, caller must call bdi_destroy() to get rid of the 1333 * If this fails, caller must call bdi_destroy() to get rid of the
1411 * bdi again. 1334 * bdi again.
1412 */ 1335 */
@@ -1420,8 +1343,6 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1420 return err; 1343 return err;
1421 1344
1422 bdi->ra_pages = default_backing_dev_info.ra_pages; 1345 bdi->ra_pages = default_backing_dev_info.ra_pages;
1423 bdi->unplug_io_fn = btrfs_unplug_io_fn;
1424 bdi->unplug_io_data = info;
1425 bdi->congested_fn = btrfs_congested_fn; 1346 bdi->congested_fn = btrfs_congested_fn;
1426 bdi->congested_data = info; 1347 bdi->congested_data = info;
1427 return 0; 1348 return 0;