Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block

* 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block: (65 commits)
  Documentation/iostats.txt: bit-size reference etc.
  cfq-iosched: removing unnecessary think time checking
  cfq-iosched: Don't clear queue stats when preempt.
  blk-throttle: Reset group slice when limits are changed
  blk-cgroup: Only give unaccounted_time under debug
  cfq-iosched: Don't set active queue in preempt
  block: fix non-atomic access to genhd inflight structures
  block: attempt to merge with existing requests on plug flush
  block: NULL dereference on error path in __blkdev_get()
  cfq-iosched: Don't update group weights when on service tree
  fs: assign sb->s_bdi to default_backing_dev_info if the bdi is going away
  block: Require subsystems to explicitly allocate bio_set integrity mempool
  jbd2: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging
  jbd: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging
  fs: make fsync_buffers_list() plug
  mm: make generic_writepages() use plugging
  blk-cgroup: Add unaccounted time to timeslice_used.
  block: fixup plugging stubs for !CONFIG_BLOCK
  block: remove obsolete comments for blkdev_issue_zeroout.
  blktrace: Use rq->cmd_flags directly in blk_add_trace_rq.
  ...

Fix up conflicts in fs/{aio.c,super.c}

64 files changed, 116 insertions, 445 deletions

diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
index 92444e94f84..d5250c5aae2 100644
--- a/fs/adfs/inode.c
+++ b/fs/adfs/inode.c
@@ -72,7 +72,6 @@ static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations adfs_aops = {
         .readpage       = adfs_readpage,
         .writepage      = adfs_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = adfs_write_begin,
         .write_end      = generic_write_end,
         .bmap           = _adfs_bmap
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 0a90dcd46de..acf321b70fc 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -429,7 +429,6 @@ static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations affs_aops = {
         .readpage = affs_readpage,
         .writepage = affs_writepage,
-        .sync_page = block_sync_page,
         .write_begin = affs_write_begin,
         .write_end = generic_write_end,
         .bmap = _affs_bmap
@@ -786,7 +785,6 @@ out:
 const struct address_space_operations affs_aops_ofs = {
         .readpage = affs_readpage_ofs,
         //.writepage = affs_writepage_ofs,
-        //.sync_page = affs_sync_page_ofs,
         .write_begin = affs_write_begin_ofs,
         .write_end = affs_write_end_ofs
 };
diff --git a/fs/aio.c b/fs/aio.c
index ebb6a22e4e1..e29ec485af2 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -34,8 +34,6 @@
 #include <linux/security.h>
 #include <linux/eventfd.h>
 #include <linux/blkdev.h>
-#include <linux/mempool.h>
-#include <linux/hash.h>
 #include <linux/compat.h>
 
 #include <asm/kmap_types.h>
@@ -65,14 +63,6 @@ static DECLARE_WORK(fput_work, aio_fput_routine);
 static DEFINE_SPINLOCK(fput_lock);
 static LIST_HEAD(fput_head);
 
-#define AIO_BATCH_HASH_BITS     3 /* allocated on-stack, so don't go crazy */
-#define AIO_BATCH_HASH_SIZE     (1 << AIO_BATCH_HASH_BITS)
-struct aio_batch_entry {
-        struct hlist_node list;
-        struct address_space *mapping;
-};
-mempool_t *abe_pool;
-
 static void aio_kick_handler(struct work_struct *);
 static void aio_queue_work(struct kioctx *);
 
@@ -86,8 +76,7 @@ static int __init aio_setup(void)
         kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC);
 
         aio_wq = alloc_workqueue("aio", 0, 1);  /* used to limit concurrency */
-        abe_pool = mempool_create_kmalloc_pool(1, sizeof(struct aio_batch_entry));
-        BUG_ON(!aio_wq || !abe_pool);
+        BUG_ON(!aio_wq);
 
         pr_debug("aio_setup: sizeof(struct page) = %d\n", (int)sizeof(struct page));
 
@@ -1525,57 +1514,8 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
         return 0;
 }
 
-static void aio_batch_add(struct address_space *mapping,
-                          struct hlist_head *batch_hash)
-{
-        struct aio_batch_entry *abe;
-        struct hlist_node *pos;
-        unsigned bucket;
-
-        bucket = hash_ptr(mapping, AIO_BATCH_HASH_BITS);
-        hlist_for_each_entry(abe, pos, &batch_hash[bucket], list) {
-                if (abe->mapping == mapping)
-                        return;
-        }
-
-        abe = mempool_alloc(abe_pool, GFP_KERNEL);
-
-        /*
-         * we should be using igrab here, but
-         * we don't want to hammer on the global
-         * inode spinlock just to take an extra
-         * reference on a file that we must already
-         * have a reference to.
-         *
-         * When we're called, we always have a reference
-         * on the file, so we must always have a reference
-         * on the inode, so ihold() is safe here.
-         */
-        ihold(mapping->host);
-        abe->mapping = mapping;
-        hlist_add_head(&abe->list, &batch_hash[bucket]);
-        return;
-}
-
-static void aio_batch_free(struct hlist_head *batch_hash)
-{
-        struct aio_batch_entry *abe;
-        struct hlist_node *pos, *n;
-        int i;
-
-        for (i = 0; i < AIO_BATCH_HASH_SIZE; i++) {
-                hlist_for_each_entry_safe(abe, pos, n, &batch_hash[i], list) {
-                        blk_run_address_space(abe->mapping);
-                        iput(abe->mapping->host);
-                        hlist_del(&abe->list);
-                        mempool_free(abe, abe_pool);
-                }
-        }
-}
-
 static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
-                         struct iocb *iocb, struct hlist_head *batch_hash,
-                         bool compat)
+                         struct iocb *iocb, bool compat)
 {
         struct kiocb *req;
         struct file *file;
@@ -1666,11 +1606,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
                         ;
         }
         spin_unlock_irq(&ctx->ctx_lock);
-        if (req->ki_opcode == IOCB_CMD_PREAD ||
-            req->ki_opcode == IOCB_CMD_PREADV ||
-            req->ki_opcode == IOCB_CMD_PWRITE ||
-            req->ki_opcode == IOCB_CMD_PWRITEV)
-                aio_batch_add(file->f_mapping, batch_hash);
 
         aio_put_req(req);       /* drop extra ref to req */
         return 0;
@@ -1687,7 +1622,7 @@ long do_io_submit(aio_context_t ctx_id, long nr,
         struct kioctx *ctx;
         long ret = 0;
         int i;
-        struct hlist_head batch_hash[AIO_BATCH_HASH_SIZE] = { { 0, }, };
+        struct blk_plug plug;
 
         if (unlikely(nr < 0))
                 return -EINVAL;
@@ -1704,6 +1639,8 @@ long do_io_submit(aio_context_t ctx_id, long nr,
                 return -EINVAL;
         }
 
+        blk_start_plug(&plug);
+
         /*
          * AKPM: should this return a partial result if some of the IOs were
          * successfully submitted?
@@ -1722,11 +1659,11 @@ long do_io_submit(aio_context_t ctx_id, long nr,
                         break;
                 }
 
-                ret = io_submit_one(ctx, user_iocb, &tmp, batch_hash, compat);
+                ret = io_submit_one(ctx, user_iocb, &tmp, compat);
                 if (ret)
                         break;
         }
-        aio_batch_free(batch_hash);
+        blk_finish_plug(&plug);
 
         put_ioctx(ctx);
         return i ? i : ret;
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index b1d0c794747..06457ed8f3e 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -75,7 +75,6 @@ static const struct inode_operations befs_dir_inode_operations = {
 
 static const struct address_space_operations befs_aops = {
         .readpage       = befs_readpage,
-        .sync_page      = block_sync_page,
         .bmap           = befs_bmap,
 };
 
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index eb67edd0f8e..f20e8a71062 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -186,7 +186,6 @@ static sector_t bfs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations bfs_aops = {
         .readpage       = bfs_readpage,
         .writepage      = bfs_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = bfs_write_begin,
         .write_end      = generic_write_end,
         .bmap           = bfs_bmap,
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c
index e49cce234c6..9c5e6b2cd11 100644
--- a/fs/bio-integrity.c
+++ b/fs/bio-integrity.c
@@ -761,6 +761,9 @@ int bioset_integrity_create(struct bio_set *bs, int pool_size)
 {
         unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES);
 
+        if (bs->bio_integrity_pool)
+                return 0;
+
         bs->bio_integrity_pool =
                 mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab);
 
diff --git a/fs/bio.c b/fs/bio.c
index 4cf2a52fbc5..4d6d4b6c2bf 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -43,7 +43,7 @@ static mempool_t *bio_split_pool __read_mostly;
  * unsigned short
  */
 #define BV(x) { .nr_vecs = x, .name = "biovec-"__stringify(x) }
-struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = {
+static struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = {
         BV(1), BV(4), BV(16), BV(64), BV(128), BV(BIO_MAX_PAGES),
 };
 #undef BV
@@ -1636,9 +1636,6 @@ struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad)
         if (!bs->bio_pool)
                 goto bad;
 
-        if (bioset_integrity_create(bs, pool_size))
-                goto bad;
-
         if (!biovec_create_pools(bs, pool_size))
                 return bs;
 
@@ -1656,12 +1653,10 @@ static void __init biovec_init_slabs(void)
                 int size;
                 struct biovec_slab *bvs = bvec_slabs + i;
 
-#ifndef CONFIG_BLK_DEV_INTEGRITY
                 if (bvs->nr_vecs <= BIO_INLINE_VECS) {
                         bvs->slab = NULL;
                         continue;
                 }
-#endif
 
                 size = bvs->nr_vecs * sizeof(struct bio_vec);
                 bvs->slab = kmem_cache_create(bvs->name, size, 0,
@@ -1684,6 +1679,9 @@ static int __init init_bio(void)
         if (!fs_bio_set)
                 panic("bio: can't allocate bios\n");
 
+        if (bioset_integrity_create(fs_bio_set, BIO_POOL_SIZE))
+                panic("bio: can't create integrity pool\n");
+
         bio_split_pool = mempool_create_kmalloc_pool(BIO_SPLIT_ENTRIES,
                                                      sizeof(struct bio_pair));
         if (!bio_split_pool)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 88928701959..7d02afb2b7f 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1087,6 +1087,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
         if (!disk)
                 goto out;
 
+        disk_block_events(disk);
         mutex_lock_nested(&bdev->bd_mutex, for_part);
         if (!bdev->bd_openers) {
                 bdev->bd_disk = disk;
@@ -1108,10 +1109,11 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                                          */
                                         disk_put_part(bdev->bd_part);
                                         bdev->bd_part = NULL;
-                                        module_put(disk->fops->owner);
-                                        put_disk(disk);
                                         bdev->bd_disk = NULL;
                                         mutex_unlock(&bdev->bd_mutex);
+                                        disk_unblock_events(disk);
+                                        module_put(disk->fops->owner);
+                                        put_disk(disk);
                                         goto restart;
                                 }
                                 if (ret)
@@ -1148,9 +1150,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                         bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
                 }
         } else {
-                module_put(disk->fops->owner);
-                put_disk(disk);
-                disk = NULL;
                 if (bdev->bd_contains == bdev) {
                         if (bdev->bd_disk->fops->open) {
                                 ret = bdev->bd_disk->fops->open(bdev, mode);
@@ -1160,11 +1159,15 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                         if (bdev->bd_invalidated)
                                 rescan_partitions(bdev->bd_disk, bdev);
                 }
+                /* only one opener holds refs to the module and disk */
+                module_put(disk->fops->owner);
+                put_disk(disk);
         }
         bdev->bd_openers++;
         if (for_part)
                 bdev->bd_part_count++;
         mutex_unlock(&bdev->bd_mutex);
+        disk_unblock_events(disk);
         return 0;
 
  out_clear:
@@ -1177,10 +1180,10 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
         bdev->bd_contains = NULL;
  out_unlock_bdev:
         mutex_unlock(&bdev->bd_mutex);
- out:
-        if (disk)
-                module_put(disk->fops->owner);
+        disk_unblock_events(disk);
+        module_put(disk->fops->owner);
         put_disk(disk);
+ out:
         bdput(bdev);
 
         return ret;
@@ -1446,14 +1449,13 @@ int blkdev_put(struct block_device *bdev, fmode_t mode)
                 if (bdev_free) {
                         if (bdev->bd_write_holder) {
                                 disk_unblock_events(bdev->bd_disk);
-                                bdev->bd_write_holder = false;
-                        } else
                                 disk_check_events(bdev->bd_disk);
+                                bdev->bd_write_holder = false;
+                        }
                 }
 
                 mutex_unlock(&bdev->bd_mutex);
-        } else
-                disk_check_events(bdev->bd_disk);
+        }
 
         return __blkdev_put(bdev, mode, 0);
 }
@@ -1527,7 +1529,6 @@ static int blkdev_releasepage(struct page *page, gfp_t wait)
 static const struct address_space_operations def_blk_aops = {
         .readpage       = blkdev_readpage,
         .writepage      = blkdev_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = blkdev_write_begin,
         .write_end      = blkdev_write_end,
         .writepages     = generic_writepages,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 100b07f021b..830d261d0e6 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 = {
         .writepages     = btree_writepages,
         .releasepage    = btree_releasepage,
         .invalidatepage = btree_invalidatepage,
-        .sync_page      = block_sync_page,
 #ifdef CONFIG_MIGRATION
         .migratepage    = btree_migratepage,
 #endif
@@ -1331,82 +1330,6 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
 }
 
 /*
- * this unplugs every device on the box, and it is only used when page
- * is null
- */
-static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-        struct btrfs_device *device;
-        struct btrfs_fs_info *info;
-
-        info = (struct btrfs_fs_info *)bdi->unplug_io_data;
-        list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
-                if (!device->bdev)
-                        continue;
-
-                bdi = blk_get_backing_dev_info(device->bdev);
-                if (bdi->unplug_io_fn)
-                        bdi->unplug_io_fn(bdi, page);
-        }
-}
-
-static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-        struct inode *inode;
-        struct extent_map_tree *em_tree;
-        struct extent_map *em;
-        struct address_space *mapping;
-        u64 offset;
-
-        /* the generic O_DIRECT read code does this */
-        if (1 || !page) {
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-
-        /*
-         * page->mapping may change at any time.  Get a consistent copy
-         * and use that for everything below
-         */
-        smp_mb();
-        mapping = page->mapping;
-        if (!mapping)
-                return;
-
-        inode = mapping->host;
-
-        /*
-         * don't do the expensive searching for a small number of
-         * devices
-         */
-        if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-
-        offset = page_offset(page);
-
-        em_tree = &BTRFS_I(inode)->extent_tree;
-        read_lock(&em_tree->lock);
-        em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
-        read_unlock(&em_tree->lock);
-        if (!em) {
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-
-        if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
-                free_extent_map(em);
-                __unplug_io_fn(bdi, page);
-                return;
-        }
-        offset = offset - em->start;
-        btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
-                          em->block_start + offset, page);
-        free_extent_map(em);
-}
-
-/*
  * If this fails, caller must call bdi_destroy() to get rid of the
  * bdi again.
  */
@@ -1420,8 +1343,6 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
                 return err;
 
         bdi->ra_pages   = default_backing_dev_info.ra_pages;
-        bdi->unplug_io_fn       = btrfs_unplug_io_fn;
-        bdi->unplug_io_data     = info;
         bdi->congested_fn       = btrfs_congested_fn;
         bdi->congested_data     = info;
         return 0;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 714adc4ac4c..b5b92824a27 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2188,7 +2188,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
         unsigned long nr_written = 0;
 
         if (wbc->sync_mode == WB_SYNC_ALL)
-                write_flags = WRITE_SYNC_PLUG;
+                write_flags = WRITE_SYNC;
         else
                 write_flags = WRITE;
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 512c3d1da08..119520bdb9a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7340,7 +7340,6 @@ static const struct address_space_operations btrfs_aops = {
         .writepage      = btrfs_writepage,
         .writepages     = btrfs_writepages,
         .readpages      = btrfs_readpages,
-        .sync_page      = block_sync_page,
         .direct_IO      = btrfs_direct_IO,
         .invalidatepage = btrfs_invalidatepage,
         .releasepage    = btrfs_releasepage,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index dd13eb81ee4..9d554e8e658 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -162,7 +162,6 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
         struct bio *cur;
         int again = 0;
         unsigned long num_run;
-        unsigned long num_sync_run;
         unsigned long batch_run = 0;
         unsigned long limit;
         unsigned long last_waited = 0;
@@ -173,11 +172,6 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
         limit = btrfs_async_submit_limit(fs_info);
         limit = limit * 2 / 3;
 
-        /* we want to make sure that every time we switch from the sync
-         * list to the normal list, we unplug
-         */
-        num_sync_run = 0;
-
 loop:
         spin_lock(&device->io_lock);
 
@@ -223,15 +217,6 @@ loop_lock:
 
         spin_unlock(&device->io_lock);
 
-        /*
-         * if we're doing the regular priority list, make sure we unplug
-         * for any high prio bios we've sent down
-         */
-        if (pending_bios == &device->pending_bios && num_sync_run > 0) {
-                num_sync_run = 0;
-                blk_run_backing_dev(bdi, NULL);
-        }
-
         while (pending) {
 
                 rmb();
@@ -259,19 +244,11 @@ loop_lock:
 
                 BUG_ON(atomic_read(&cur->bi_cnt) == 0);
 
-                if (cur->bi_rw & REQ_SYNC)
-                        num_sync_run++;
-
                 submit_bio(cur->bi_rw, cur);
                 num_run++;
                 batch_run++;
-                if (need_resched()) {
-                        if (num_sync_run) {
-                                blk_run_backing_dev(bdi, NULL);
-                                num_sync_run = 0;
-                        }
+                if (need_resched())
                         cond_resched();
-                }
 
                 /*
                  * we made progress, there is more work to do and the bdi
@@ -304,13 +281,8 @@ loop_lock:
                                  * against it before looping
                                  */
                                 last_waited = ioc->last_waited;
-                                if (need_resched()) {
-                                        if (num_sync_run) {
-                                                blk_run_backing_dev(bdi, NULL);
-                                                num_sync_run = 0;
-                                        }
+                                if (need_resched())
                                         cond_resched();
-                                }
                                 continue;
                         }
                         spin_lock(&device->io_lock);
@@ -323,22 +295,6 @@ loop_lock:
                 }
         }
 
-        if (num_sync_run) {
-                num_sync_run = 0;
-                blk_run_backing_dev(bdi, NULL);
-        }
-        /*
-         * IO has already been through a long path to get here.  Checksumming,
-         * async helper threads, perhaps compression.  We've done a pretty
-         * good job of collecting a batch of IO and should just unplug
-         * the device right away.
-         *
-         * This will help anyone who is waiting on the IO, they might have
-         * already unplugged, but managed to do so before the bio they
-         * cared about found its way down here.
-         */
-        blk_run_backing_dev(bdi, NULL);
-
         cond_resched();
         if (again)
                 goto loop;
@@ -2955,7 +2911,7 @@ static int find_live_mirror(struct map_lookup *map, int first, int num,
 static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
                              u64 logical, u64 *length,
                              struct btrfs_multi_bio **multi_ret,
-                             int mirror_num, struct page *unplug_page)
+                             int mirror_num)
 {
         struct extent_map *em;
         struct map_lookup *map;
@@ -2987,11 +2943,6 @@ again:
         em = lookup_extent_mapping(em_tree, logical, *length);
         read_unlock(&em_tree->lock);
 
-        if (!em && unplug_page) {
-                kfree(multi);
-                return 0;
-        }
-
         if (!em) {
                 printk(KERN_CRIT "unable to find logical %llu len %llu\n",
                        (unsigned long long)logical,
@@ -3047,13 +2998,13 @@ again:
                 *length = em->len - offset;
         }
 
-        if (!multi_ret && !unplug_page)
+        if (!multi_ret)
                 goto out;
 
         num_stripes = 1;
         stripe_index = 0;
         if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
-                if (unplug_page || (rw & REQ_WRITE))
+                if (rw & REQ_WRITE)
                         num_stripes = map->num_stripes;
                 else if (mirror_num)
                         stripe_index = mirror_num - 1;
@@ -3075,7 +3026,7 @@ again:
                 stripe_index = do_div(stripe_nr, factor);
                 stripe_index *= map->sub_stripes;
 
-                if (unplug_page || (rw & REQ_WRITE))
+                if (rw & REQ_WRITE)
                         num_stripes = map->sub_stripes;
                 else if (mirror_num)
                         stripe_index += mirror_num - 1;
@@ -3095,22 +3046,10 @@ again:
         BUG_ON(stripe_index >= map->num_stripes);
 
         for (i = 0; i < num_stripes; i++) {
-                if (unplug_page) {
-                        struct btrfs_device *device;
-                        struct backing_dev_info *bdi;
-
-                        device = map->stripes[stripe_index].dev;
-                        if (device->bdev) {
-                                bdi = blk_get_backing_dev_info(device->bdev);
-                                if (bdi->unplug_io_fn)
-                                        bdi->unplug_io_fn(bdi, unplug_page);
-                        }
-                } else {
-                        multi->stripes[i].physical =
-                                map->stripes[stripe_index].physical +
-                                stripe_offset + stripe_nr * map->stripe_len;
-                        multi->stripes[i].dev = map->stripes[stripe_index].dev;
-                }
+                multi->stripes[i].physical =
+                        map->stripes[stripe_index].physical +
+                        stripe_offset + stripe_nr * map->stripe_len;
+                multi->stripes[i].dev = map->stripes[stripe_index].dev;
                 stripe_index++;
         }
         if (multi_ret) {
@@ -3128,7 +3067,7 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
                       struct btrfs_multi_bio **multi_ret, int mirror_num)
 {
         return __btrfs_map_block(map_tree, rw, logical, length, multi_ret,
-                                 mirror_num, NULL);
+                                 mirror_num);
 }
 
 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
@@ -3196,14 +3135,6 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
         return 0;
 }
 
-int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
-                      u64 logical, struct page *page)
-{
-        u64 length = PAGE_CACHE_SIZE;
-        return __btrfs_map_block(map_tree, READ, logical, &length,
-                                 NULL, 0, page);
-}
-
 static void end_bio_multi_stripe(struct bio *bio, int err)
 {
         struct btrfs_multi_bio *multi = bio->bi_private;
diff --git a/fs/buffer.c b/fs/buffer.c
index 2219a76e2ca..2e6b1a387b7 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -54,23 +54,15 @@ init_buffer(struct buffer_head *bh, bh_end_io_t *handler, void *private)
 }
 EXPORT_SYMBOL(init_buffer);
 
-static int sync_buffer(void *word)
+static int sleep_on_buffer(void *word)
 {
-        struct block_device *bd;
-        struct buffer_head *bh
-                = container_of(word, struct buffer_head, b_state);
-
-        smp_mb();
-        bd = bh->b_bdev;
-        if (bd)
-                blk_run_address_space(bd->bd_inode->i_mapping);
         io_schedule();
         return 0;
 }
 
 void __lock_buffer(struct buffer_head *bh)
 {
-        wait_on_bit_lock(&bh->b_state, BH_Lock, sync_buffer,
+        wait_on_bit_lock(&bh->b_state, BH_Lock, sleep_on_buffer,
                                                         TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL(__lock_buffer);
@@ -90,7 +82,7 @@ EXPORT_SYMBOL(unlock_buffer);
  */
 void __wait_on_buffer(struct buffer_head * bh)
 {
-        wait_on_bit(&bh->b_state, BH_Lock, sync_buffer, TASK_UNINTERRUPTIBLE);
+        wait_on_bit(&bh->b_state, BH_Lock, sleep_on_buffer, TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL(__wait_on_buffer);
 
@@ -749,10 +741,12 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
 {
         struct buffer_head *bh;
         struct list_head tmp;
-        struct address_space *mapping, *prev_mapping = NULL;
+        struct address_space *mapping;
         int err = 0, err2;
+        struct blk_plug plug;
 
         INIT_LIST_HEAD(&tmp);
+        blk_start_plug(&plug);
 
         spin_lock(lock);
         while (!list_empty(list)) {
@@ -775,7 +769,7 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
                                  * still in flight on potentially older
                                  * contents.
                                  */
-                                write_dirty_buffer(bh, WRITE_SYNC_PLUG);
+                                write_dirty_buffer(bh, WRITE_SYNC);
 
                                 /*
                                  * Kick off IO for the previous mapping. Note
@@ -783,16 +777,16 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
                                  * wait_on_buffer() will do that for us
                                  * through sync_buffer().
                                  */
-                                if (prev_mapping && prev_mapping != mapping)
-                                        blk_run_address_space(prev_mapping);
-                                prev_mapping = mapping;
-
                                 brelse(bh);
                                 spin_lock(lock);
                         }
                 }
         }
 
+        spin_unlock(lock);
+        blk_finish_plug(&plug);
+        spin_lock(lock);
+
         while (!list_empty(&tmp)) {
                 bh = BH_ENTRY(tmp.prev);
                 get_bh(bh);
@@ -1614,14 +1608,8 @@ EXPORT_SYMBOL(unmap_underlying_metadata);
  * prevents this contention from occurring.
  *
  * If block_write_full_page() is called with wbc->sync_mode ==
- * WB_SYNC_ALL, the writes are posted using WRITE_SYNC_PLUG; this
- * causes the writes to be flagged as synchronous writes, but the
- * block device queue will NOT be unplugged, since usually many pages
- * will be pushed to the out before the higher-level caller actually
- * waits for the writes to be completed.  The various wait functions,
- * such as wait_on_writeback_range() will ultimately call sync_page()
- * which will ultimately call blk_run_backing_dev(), which will end up
- * unplugging the device queue.
+ * WB_SYNC_ALL, the writes are posted using WRITE_SYNC; this
+ * causes the writes to be flagged as synchronous writes.
  */
 static int __block_write_full_page(struct inode *inode, struct page *page,
                         get_block_t *get_block, struct writeback_control *wbc,
@@ -1634,7 +1622,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
         const unsigned blocksize = 1 << inode->i_blkbits;
         int nr_underway = 0;
         int write_op = (wbc->sync_mode == WB_SYNC_ALL ?
-                        WRITE_SYNC_PLUG : WRITE);
+                        WRITE_SYNC : WRITE);
 
         BUG_ON(!PageLocked(page));
 
@@ -3138,17 +3126,6 @@ out:
 }
 EXPORT_SYMBOL(try_to_free_buffers);
 
-void block_sync_page(struct page *page)
-{
-        struct address_space *mapping;
-
-        smp_mb();
-        mapping = page_mapping(page);
-        if (mapping)
-                blk_run_backing_dev(mapping->backing_dev_info, page);
-}
-EXPORT_SYMBOL(block_sync_page);
-
 /*
  * There are no bdflush tunables left.  But distributions are
  * still running obsolete flush daemons, so we terminate them here.
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index e964b1cd5dd..c27d236738f 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1569,34 +1569,6 @@ int cifs_fsync(struct file *file, int datasync)
         return rc;
 }
 
-/* static void cifs_sync_page(struct page *page)
-{
-        struct address_space *mapping;
-        struct inode *inode;
-        unsigned long index = page->index;
-        unsigned int rpages = 0;
-        int rc = 0;
-
-        cFYI(1, "sync page %p", page);
-        mapping = page->mapping;
-        if (!mapping)
-                return 0;
-        inode = mapping->host;
-        if (!inode)
-                return; */
-
-/*      fill in rpages then
-        result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
-
-/*      cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index);
-
-#if 0
-        if (rc < 0)
-                return rc;
-        return 0;
-#endif
-} */
-
 /*
  * As file closes, flush all cached write data for this inode checking
  * for write behind errors.
@@ -2510,7 +2482,6 @@ const struct address_space_operations cifs_addr_ops = {
         .set_page_dirty = __set_page_dirty_nobuffers,
         .releasepage = cifs_release_page,
         .invalidatepage = cifs_invalidate_page,
-        /* .sync_page = cifs_sync_page, */
         /* .direct_IO = */
 };
 
@@ -2528,6 +2499,5 @@ const struct address_space_operations cifs_addr_ops_smallbuf = {
         .set_page_dirty = __set_page_dirty_nobuffers,
         .releasepage = cifs_release_page,
         .invalidatepage = cifs_invalidate_page,
-        /* .sync_page = cifs_sync_page, */
         /* .direct_IO = */
 };
diff --git a/fs/direct-io.c b/fs/direct-io.c
index dcb5577cde1..ac5f164170e 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1110,11 +1110,8 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
             ((rw & READ) || (dio->result == dio->size)))
                 ret = -EIOCBQUEUED;
 
-        if (ret != -EIOCBQUEUED) {
-                /* All IO is now issued, send it on its way */
-                blk_run_address_space(inode->i_mapping);
+        if (ret != -EIOCBQUEUED)
                 dio_await_completion(dio);
-        }
 
         /*
          * Sync will always be dropping the final ref and completing the
@@ -1176,7 +1173,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
         struct dio *dio;
 
         if (rw & WRITE)
-                rw = WRITE_ODIRECT_PLUG;
+                rw = WRITE_ODIRECT;
 
         if (bdev)
                 bdev_blkbits = blksize_bits(bdev_logical_block_size(bdev));
diff --git a/fs/efs/inode.c b/fs/efs/inode.c
index a8e7797b947..9c13412e6c9 100644
--- a/fs/efs/inode.c
+++ b/fs/efs/inode.c
@@ -23,7 +23,6 @@ static sector_t _efs_bmap(struct address_space *mapping, sector_t block)
 }
 static const struct address_space_operations efs_aops = {
         .readpage = efs_readpage,
-        .sync_page = block_sync_page,
         .bmap = _efs_bmap
 };
 
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 0c713cfbebf..8472c098445 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -823,7 +823,6 @@ const struct address_space_operations exofs_aops = {
         .direct_IO      = NULL, /* TODO: Should be trivial to do */
 
         /* With these NULL has special meaning or default is not exported */
-        .sync_page      = NULL,
         .get_xip_mem    = NULL,
         .migratepage    = NULL,
         .launder_page   = NULL,
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 40ad210a504..c47f706878b 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -860,7 +860,6 @@ const struct address_space_operations ext2_aops = {
         .readpage               = ext2_readpage,
         .readpages              = ext2_readpages,
         .writepage              = ext2_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext2_write_begin,
         .write_end              = ext2_write_end,
         .bmap                   = ext2_bmap,
@@ -880,7 +879,6 @@ const struct address_space_operations ext2_nobh_aops = {
         .readpage               = ext2_readpage,
         .readpages              = ext2_readpages,
         .writepage              = ext2_nobh_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext2_nobh_write_begin,
         .write_end              = nobh_write_end,
         .bmap                   = ext2_bmap,
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index ae94f6d949f..fe2541d250e 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1894,7 +1894,6 @@ static const struct address_space_operations ext3_ordered_aops = {
         .readpage               = ext3_readpage,
         .readpages              = ext3_readpages,
         .writepage              = ext3_ordered_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext3_write_begin,
         .write_end              = ext3_ordered_write_end,
         .bmap                   = ext3_bmap,
@@ -1910,7 +1909,6 @@ static const struct address_space_operations ext3_writeback_aops = {
         .readpage               = ext3_readpage,
         .readpages              = ext3_readpages,
         .writepage              = ext3_writeback_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext3_write_begin,
         .write_end              = ext3_writeback_write_end,
         .bmap                   = ext3_bmap,
@@ -1926,7 +1924,6 @@ static const struct address_space_operations ext3_journalled_aops = {
         .readpage               = ext3_readpage,
         .readpages              = ext3_readpages,
         .writepage              = ext3_journalled_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext3_write_begin,
         .write_end              = ext3_journalled_write_end,
         .set_page_dirty         = ext3_journalled_set_page_dirty,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9f7f9e49914..9297ad46c46 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3903,7 +3903,6 @@ static const struct address_space_operations ext4_ordered_aops = {
         .readpage               = ext4_readpage,
         .readpages              = ext4_readpages,
         .writepage              = ext4_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext4_write_begin,
         .write_end              = ext4_ordered_write_end,
         .bmap                   = ext4_bmap,
@@ -3919,7 +3918,6 @@ static const struct address_space_operations ext4_writeback_aops = {
         .readpage               = ext4_readpage,
         .readpages              = ext4_readpages,
         .writepage              = ext4_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext4_write_begin,
         .write_end              = ext4_writeback_write_end,
         .bmap                   = ext4_bmap,
@@ -3935,7 +3933,6 @@ static const struct address_space_operations ext4_journalled_aops = {
         .readpage               = ext4_readpage,
         .readpages              = ext4_readpages,
         .writepage              = ext4_writepage,
-        .sync_page              = block_sync_page,
         .write_begin            = ext4_write_begin,
         .write_end              = ext4_journalled_write_end,
         .set_page_dirty         = ext4_journalled_set_page_dirty,
@@ -3951,7 +3948,6 @@ static const struct address_space_operations ext4_da_aops = {
         .readpages              = ext4_readpages,
         .writepage              = ext4_writepage,
         .writepages             = ext4_da_writepages,
-        .sync_page              = block_sync_page,
         .write_begin            = ext4_da_write_begin,
         .write_end              = ext4_da_write_end,
         .bmap                   = ext4_bmap,
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 955cc309142..e2cd90e4bb7 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -310,8 +310,7 @@ static int io_submit_init(struct ext4_io_submit *io,
         io_end->offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(bh);
 
         io->io_bio = bio;
-        io->io_op = (wbc->sync_mode == WB_SYNC_ALL ?
-                        WRITE_SYNC_PLUG : WRITE);
+        io->io_op = (wbc->sync_mode == WB_SYNC_ALL ?  WRITE_SYNC : WRITE);
         io->io_next_block = bh->b_blocknr;
         return 0;
 }
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 0e277ec4b61..8d68690bdcf 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -236,7 +236,6 @@ static const struct address_space_operations fat_aops = {
         .readpages      = fat_readpages,
         .writepage      = fat_writepage,
         .writepages     = fat_writepages,
-        .sync_page      = block_sync_page,
         .write_begin    = fat_write_begin,
         .write_end      = fat_write_end,
         .direct_IO      = fat_direct_IO,
diff --git a/fs/freevxfs/vxfs_subr.c b/fs/freevxfs/vxfs_subr.c
index 1429f3ae1e8..5d318c44f85 100644
--- a/fs/freevxfs/vxfs_subr.c
+++ b/fs/freevxfs/vxfs_subr.c
@@ -44,7 +44,6 @@ static sector_t		vxfs_bmap(struct address_space *, sector_t);
 const struct address_space_operations vxfs_aops = {
         .readpage =             vxfs_readpage,
         .bmap =                 vxfs_bmap,
-        .sync_page =            block_sync_page,
 };
 
 inline void
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 051b1a08452..cc6ec4b2f0f 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -870,7 +870,6 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
 
         fc->bdi.name = "fuse";
         fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
-        fc->bdi.unplug_io_fn = default_unplug_io_fn;
         /* fuse does it's own writeback accounting */
         fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
 
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index aad77e4f61b..c71995b111b 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -1117,7 +1117,6 @@ static const struct address_space_operations gfs2_writeback_aops = {
         .writepages = gfs2_writeback_writepages,
         .readpage = gfs2_readpage,
         .readpages = gfs2_readpages,
-        .sync_page = block_sync_page,
         .write_begin = gfs2_write_begin,
         .write_end = gfs2_write_end,
         .bmap = gfs2_bmap,
@@ -1133,7 +1132,6 @@ static const struct address_space_operations gfs2_ordered_aops = {
         .writepage = gfs2_ordered_writepage,
         .readpage = gfs2_readpage,
         .readpages = gfs2_readpages,
-        .sync_page = block_sync_page,
         .write_begin = gfs2_write_begin,
         .write_end = gfs2_write_end,
         .set_page_dirty = gfs2_set_page_dirty,
@@ -1151,7 +1149,6 @@ static const struct address_space_operations gfs2_jdata_aops = {
         .writepages = gfs2_jdata_writepages,
         .readpage = gfs2_readpage,
         .readpages = gfs2_readpages,
-        .sync_page = block_sync_page,
         .write_begin = gfs2_write_begin,
         .write_end = gfs2_write_end,
         .set_page_dirty = gfs2_set_page_dirty,
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index e7ed31f858d..5b102c1887f 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -121,7 +121,7 @@ __acquires(&sdp->sd_ail_lock)
                         lock_buffer(bh);
                         if (test_clear_buffer_dirty(bh)) {
                                 bh->b_end_io = end_buffer_write_sync;
-                                submit_bh(WRITE_SYNC_PLUG, bh);
+                                submit_bh(WRITE_SYNC, bh);
                         } else {
                                 unlock_buffer(bh);
                                 brelse(bh);
@@ -647,7 +647,7 @@ static void gfs2_ordered_write(struct gfs2_sbd *sdp)
                 lock_buffer(bh);
                 if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
                         bh->b_end_io = end_buffer_write_sync;
-                        submit_bh(WRITE_SYNC_PLUG, bh);
+                        submit_bh(WRITE_SYNC, bh);
                 } else {
                         unlock_buffer(bh);
                         brelse(bh);
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index e919abf25ec..51d27f00ebb 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -204,7 +204,7 @@ static void buf_lo_before_commit(struct gfs2_sbd *sdp)
                 }
 
                 gfs2_log_unlock(sdp);
-                submit_bh(WRITE_SYNC_PLUG, bh);
+                submit_bh(WRITE_SYNC, bh);
                 gfs2_log_lock(sdp);
 
                 n = 0;
@@ -214,7 +214,7 @@ static void buf_lo_before_commit(struct gfs2_sbd *sdp)
                         gfs2_log_unlock(sdp);
                         lock_buffer(bd2->bd_bh);
                         bh = gfs2_log_fake_buf(sdp, bd2->bd_bh);
-                        submit_bh(WRITE_SYNC_PLUG, bh);
+                        submit_bh(WRITE_SYNC, bh);
                         gfs2_log_lock(sdp);
                         if (++n >= num)
                                 break;
@@ -356,7 +356,7 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
                 sdp->sd_log_num_revoke--;
 
                 if (offset + sizeof(u64) > sdp->sd_sb.sb_bsize) {
-                        submit_bh(WRITE_SYNC_PLUG, bh);
+                        submit_bh(WRITE_SYNC, bh);
 
                         bh = gfs2_log_get_buf(sdp);
                         mh = (struct gfs2_meta_header *)bh->b_data;
@@ -373,7 +373,7 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp)
         }
         gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 
-        submit_bh(WRITE_SYNC_PLUG, bh);
+        submit_bh(WRITE_SYNC, bh);
 }
 
 static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
@@ -575,7 +575,7 @@ static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
         ptr = bh_log_ptr(bh);
         
         get_bh(bh);
-        submit_bh(WRITE_SYNC_PLUG, bh);
+        submit_bh(WRITE_SYNC, bh);
         gfs2_log_lock(sdp);
         while(!list_empty(list)) {
                 bd = list_entry(list->next, struct gfs2_bufdata, bd_le.le_list);
@@ -601,7 +601,7 @@ static void gfs2_write_blocks(struct gfs2_sbd *sdp, struct buffer_head *bh,
                 } else {
                         bh1 = gfs2_log_fake_buf(sdp, bd->bd_bh);
                 }
-                submit_bh(WRITE_SYNC_PLUG, bh1);
+                submit_bh(WRITE_SYNC, bh1);
                 gfs2_log_lock(sdp);
                 ptr += 2;
         }
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 01d97f48655..675349b5a13 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -37,7 +37,7 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
         struct buffer_head *bh, *head;
         int nr_underway = 0;
         int write_op = REQ_META |
-                (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC_PLUG : WRITE);
+                (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
 
         BUG_ON(!PageLocked(page));
         BUG_ON(!page_has_buffers(page));
@@ -94,7 +94,6 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
 const struct address_space_operations gfs2_meta_aops = {
         .writepage = gfs2_aspace_writepage,
         .releasepage = gfs2_releasepage,
-        .sync_page = block_sync_page,
 };
 
 /**
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index dffb4e99664..fff16c968e6 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -150,7 +150,6 @@ static int hfs_writepages(struct address_space *mapping,
 const struct address_space_operations hfs_btree_aops = {
         .readpage       = hfs_readpage,
         .writepage      = hfs_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = hfs_write_begin,
         .write_end      = generic_write_end,
         .bmap           = hfs_bmap,
@@ -160,7 +159,6 @@ const struct address_space_operations hfs_btree_aops = {
 const struct address_space_operations hfs_aops = {
         .readpage       = hfs_readpage,
         .writepage      = hfs_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = hfs_write_begin,
         .write_end      = generic_write_end,
         .bmap           = hfs_bmap,
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index a8df651747f..b248a6cfcad 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -146,7 +146,6 @@ static int hfsplus_writepages(struct address_space *mapping,
 const struct address_space_operations hfsplus_btree_aops = {
         .readpage       = hfsplus_readpage,
         .writepage      = hfsplus_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = hfsplus_write_begin,
         .write_end      = generic_write_end,
         .bmap           = hfsplus_bmap,
@@ -156,7 +155,6 @@ const struct address_space_operations hfsplus_btree_aops = {
 const struct address_space_operations hfsplus_aops = {
         .readpage       = hfsplus_readpage,
         .writepage      = hfsplus_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = hfsplus_write_begin,
         .write_end      = generic_write_end,
         .bmap           = hfsplus_bmap,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index 2dbae20450f..9b9eb6933e4 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -119,7 +119,6 @@ static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations hpfs_aops = {
         .readpage = hpfs_readpage,
         .writepage = hpfs_writepage,
-        .sync_page = block_sync_page,
         .write_begin = hpfs_write_begin,
         .write_end = generic_write_end,
         .bmap = _hpfs_bmap
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index a0f3833c0db..3db5ba4568f 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1158,7 +1158,6 @@ static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
 
 static const struct address_space_operations isofs_aops = {
         .readpage = isofs_readpage,
-        .sync_page = block_sync_page,
         .bmap = _isofs_bmap
 };
 
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index 34a4861c14b..da871ee084d 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -20,6 +20,7 @@
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/bio.h>
+#include <linux/blkdev.h>
 
 /*
  * Default IO end handler for temporary BJ_IO buffer_heads.
@@ -294,7 +295,7 @@ void journal_commit_transaction(journal_t *journal)
         int first_tag = 0;
         int tag_flag;
         int i;
-        int write_op = WRITE_SYNC;
+        struct blk_plug plug;
 
         /*
          * First job: lock down the current transaction and wait for
@@ -327,13 +328,6 @@ void journal_commit_transaction(journal_t *journal)
         spin_lock(&journal->j_state_lock);
         commit_transaction->t_state = T_LOCKED;
 
-        /*
-         * Use plugged writes here, since we want to submit several before
-         * we unplug the device. We don't do explicit unplugging in here,
-         * instead we rely on sync_buffer() doing the unplug for us.
-         */
-        if (commit_transaction->t_synchronous_commit)
-                write_op = WRITE_SYNC_PLUG;
         spin_lock(&commit_transaction->t_handle_lock);
         while (commit_transaction->t_updates) {
                 DEFINE_WAIT(wait);
@@ -418,8 +412,10 @@ void journal_commit_transaction(journal_t *journal)
          * Now start flushing things to disk, in the order they appear
          * on the transaction lists.  Data blocks go first.
          */
+        blk_start_plug(&plug);
         err = journal_submit_data_buffers(journal, commit_transaction,
-                                          write_op);
+                                          WRITE_SYNC);
+        blk_finish_plug(&plug);
 
         /*
          * Wait for all previously submitted IO to complete.
@@ -480,7 +476,9 @@ void journal_commit_transaction(journal_t *journal)
                 err = 0;
         }
 
-        journal_write_revoke_records(journal, commit_transaction, write_op);
+        blk_start_plug(&plug);
+
+        journal_write_revoke_records(journal, commit_transaction, WRITE_SYNC);
 
         /*
          * If we found any dirty or locked buffers, then we should have
@@ -650,7 +648,7 @@ start_journal_io:
                                 clear_buffer_dirty(bh);
                                 set_buffer_uptodate(bh);
                                 bh->b_end_io = journal_end_buffer_io_sync;
-                                submit_bh(write_op, bh);
+                                submit_bh(WRITE_SYNC, bh);
                         }
                         cond_resched();
 
@@ -661,6 +659,8 @@ start_journal_io:
                 }
         }
 
+        blk_finish_plug(&plug);
+
         /* Lo and behold: we have just managed to send a transaction to
            the log.  Before we can commit it, wait for the IO so far to
            complete.  Control buffers being written are on the
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index f3ad1598b20..fa36d7662b2 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -137,9 +137,9 @@ static int journal_submit_commit_record(journal_t *journal,
         if (journal->j_flags & JBD2_BARRIER &&
             !JBD2_HAS_INCOMPAT_FEATURE(journal,
                                        JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT))
-                ret = submit_bh(WRITE_SYNC_PLUG | WRITE_FLUSH_FUA, bh);
+                ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh);
         else
-                ret = submit_bh(WRITE_SYNC_PLUG, bh);
+                ret = submit_bh(WRITE_SYNC, bh);
 
         *cbh = bh;
         return ret;
@@ -329,7 +329,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         int tag_bytes = journal_tag_bytes(journal);
         struct buffer_head *cbh = NULL; /* For transactional checksums */
         __u32 crc32_sum = ~0;
-        int write_op = WRITE_SYNC;
+        struct blk_plug plug;
 
         /*
          * First job: lock down the current transaction and wait for
@@ -363,13 +363,6 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         write_lock(&journal->j_state_lock);
         commit_transaction->t_state = T_LOCKED;
 
-        /*
-         * Use plugged writes here, since we want to submit several before
-         * we unplug the device. We don't do explicit unplugging in here,
-         * instead we rely on sync_buffer() doing the unplug for us.
-         */
-        if (commit_transaction->t_synchronous_commit)
-                write_op = WRITE_SYNC_PLUG;
         trace_jbd2_commit_locking(journal, commit_transaction);
         stats.run.rs_wait = commit_transaction->t_max_wait;
         stats.run.rs_locked = jiffies;
@@ -469,8 +462,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         if (err)
                 jbd2_journal_abort(journal, err);
 
+        blk_start_plug(&plug);
         jbd2_journal_write_revoke_records(journal, commit_transaction,
-                                          write_op);
+                                          WRITE_SYNC);
+        blk_finish_plug(&plug);
 
         jbd_debug(3, "JBD: commit phase 2\n");
 
@@ -497,6 +492,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
         err = 0;
         descriptor = NULL;
         bufs = 0;
+        blk_start_plug(&plug);
         while (commit_transaction->t_buffers) {
 
                 /* Find the next buffer to be journaled... */
@@ -658,7 +654,7 @@ start_journal_io:
                                 clear_buffer_dirty(bh);
                                 set_buffer_uptodate(bh);
                                 bh->b_end_io = journal_end_buffer_io_sync;
-                                submit_bh(write_op, bh);
+                                submit_bh(WRITE_SYNC, bh);
                         }
                         cond_resched();
                         stats.run.rs_blocks_logged += bufs;
@@ -699,6 +695,8 @@ start_journal_io:
                         __jbd2_journal_abort_hard(journal);
         }
 
+        blk_finish_plug(&plug);
+
         /* Lo and behold: we have just managed to send a transaction to
            the log.  Before we can commit it, wait for the IO so far to
            complete.  Control buffers being written are on the
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 9978803ceed..eddbb373209 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -352,7 +352,6 @@ const struct address_space_operations jfs_aops = {
         .readpages      = jfs_readpages,
         .writepage      = jfs_writepage,
         .writepages     = jfs_writepages,
-        .sync_page      = block_sync_page,
         .write_begin    = jfs_write_begin,
         .write_end      = nobh_write_end,
         .bmap           = jfs_bmap,
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 48b44bd8267..6740d34cd82 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -583,7 +583,6 @@ static void metapage_invalidatepage(struct page *page, unsigned long offset)
 const struct address_space_operations jfs_metapage_aops = {
         .readpage       = metapage_readpage,
         .writepage      = metapage_writepage,
-        .sync_page      = block_sync_page,
         .releasepage    = metapage_releasepage,
         .invalidatepage = metapage_invalidatepage,
         .set_page_dirty = __set_page_dirty_nobuffers,
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 723bc5bca09..1adc8d455f0 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -39,7 +39,6 @@ static int sync_request(struct page *page, struct block_device *bdev, int rw)
         bio.bi_end_io = request_complete;
 
         submit_bio(rw, &bio);
-        generic_unplug_device(bdev_get_queue(bdev));
         wait_for_completion(&complete);
         return test_bit(BIO_UPTODATE, &bio.bi_flags) ? 0 : -EIO;
 }
@@ -168,7 +167,6 @@ static void bdev_writeseg(struct super_block *sb, u64 ofs, size_t len)
         }
         len = PAGE_ALIGN(len);
         __bdev_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);
-        generic_unplug_device(bdev_get_queue(logfs_super(sb)->s_bdev));
 }
 
 
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index ae0b83f476a..adcdc0a4e18 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -399,7 +399,6 @@ static sector_t minix_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations minix_aops = {
         .readpage = minix_readpage,
         .writepage = minix_writepage,
-        .sync_page = block_sync_page,
         .write_begin = minix_write_begin,
         .write_end = generic_write_end,
         .bmap = minix_bmap
diff --git a/fs/mpage.c b/fs/mpage.c
index d78455a81ec..0afc809e46e 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -364,6 +364,9 @@ mpage_readpages(struct address_space *mapping, struct list_head *pages,
         sector_t last_block_in_bio = 0;
         struct buffer_head map_bh;
         unsigned long first_logical_block = 0;
+        struct blk_plug plug;
+
+        blk_start_plug(&plug);
 
         map_bh.b_state = 0;
         map_bh.b_size = 0;
@@ -385,6 +388,7 @@ mpage_readpages(struct address_space *mapping, struct list_head *pages,
         BUG_ON(!list_empty(pages));
         if (bio)
                 mpage_bio_submit(READ, bio);
+        blk_finish_plug(&plug);
         return 0;
 }
 EXPORT_SYMBOL(mpage_readpages);
@@ -666,8 +670,11 @@ int
 mpage_writepages(struct address_space *mapping,
                 struct writeback_control *wbc, get_block_t get_block)
 {
+        struct blk_plug plug;
         int ret;
 
+        blk_start_plug(&plug);
+
         if (!get_block)
                 ret = generic_writepages(mapping, wbc);
         else {
@@ -682,6 +689,7 @@ mpage_writepages(struct address_space *mapping,
                 if (mpd.bio)
                         mpage_bio_submit(WRITE, mpd.bio);
         }
+        blk_finish_plug(&plug);
         return ret;
 }
 EXPORT_SYMBOL(mpage_writepages);
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 85f7baa15f5..609cd223eea 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -34,15 +34,10 @@
 #include "page.h"
 #include "btnode.h"
 
-
-static const struct address_space_operations def_btnode_aops = {
-        .sync_page              = block_sync_page,
-};
-
 void nilfs_btnode_cache_init(struct address_space *btnc,
                              struct backing_dev_info *bdi)
 {
-        nilfs_mapping_init(btnc, bdi, &def_btnode_aops);
+        nilfs_mapping_init(btnc, bdi);
 }
 
 void nilfs_btnode_cache_clear(struct address_space *btnc)
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index caf9a6a3fb5..1c2a3e23f8b 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -49,7 +49,6 @@
 #include "ifile.h"
 
 static const struct address_space_operations def_gcinode_aops = {
-        .sync_page              = block_sync_page,
 };
 
 /*
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index d5625be236a..c0aa27490c0 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -280,7 +280,6 @@ nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 const struct address_space_operations nilfs_aops = {
         .writepage              = nilfs_writepage,
         .readpage               = nilfs_readpage,
-        .sync_page              = block_sync_page,
         .writepages             = nilfs_writepages,
         .set_page_dirty         = nilfs_set_page_dirty,
         .readpages              = nilfs_readpages,
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index a0babd2bff6..a649b05f706 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -399,7 +399,6 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
 
 static const struct address_space_operations def_mdt_aops = {
         .writepage              = nilfs_mdt_write_page,
-        .sync_page              = block_sync_page,
 };
 
 static const struct inode_operations def_mdt_iops;
@@ -438,10 +437,6 @@ void nilfs_mdt_set_entry_size(struct inode *inode, unsigned entry_size,
         mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size);
 }
 
-static const struct address_space_operations shadow_map_aops = {
-        .sync_page              = block_sync_page,
-};
-
 /**
  * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file
  * @inode: inode of the metadata file
@@ -455,9 +450,9 @@ int nilfs_mdt_setup_shadow_map(struct inode *inode,
 
         INIT_LIST_HEAD(&shadow->frozen_buffers);
         address_space_init_once(&shadow->frozen_data);
-        nilfs_mapping_init(&shadow->frozen_data, bdi, &shadow_map_aops);
+        nilfs_mapping_init(&shadow->frozen_data, bdi);
         address_space_init_once(&shadow->frozen_btnodes);
-        nilfs_mapping_init(&shadow->frozen_btnodes, bdi, &shadow_map_aops);
+        nilfs_mapping_init(&shadow->frozen_btnodes, bdi);
         mi->mi_shadow = shadow;
         return 0;
 }
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index a585b35fd6b..4d2a1ee0eb4 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -493,15 +493,14 @@ unsigned nilfs_page_count_clean_buffers(struct page *page,
 }
 
 void nilfs_mapping_init(struct address_space *mapping,
-                        struct backing_dev_info *bdi,
-                        const struct address_space_operations *aops)
+                        struct backing_dev_info *bdi)
 {
         mapping->host = NULL;
         mapping->flags = 0;
         mapping_set_gfp_mask(mapping, GFP_NOFS);
         mapping->assoc_mapping = NULL;
         mapping->backing_dev_info = bdi;
-        mapping->a_ops = aops;
+        mapping->a_ops = NULL;
 }
 
 /*
diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h
index 2a00953ebd5..f06b79ad749 100644
--- a/fs/nilfs2/page.h
+++ b/fs/nilfs2/page.h
@@ -62,8 +62,7 @@ int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
 void nilfs_copy_back_pages(struct address_space *, struct address_space *);
 void nilfs_clear_dirty_pages(struct address_space *);
 void nilfs_mapping_init(struct address_space *mapping,
-                        struct backing_dev_info *bdi,
-                        const struct address_space_operations *aops);
+                        struct backing_dev_info *bdi);
 unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
 unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
                                             sector_t start_blk,
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 0f83e93935b..2853ff20f85 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -509,7 +509,7 @@ static int nilfs_segbuf_write(struct nilfs_segment_buffer *segbuf,
                  * Last BIO is always sent through the following
                  * submission.
                  */
-                rw |= REQ_SYNC | REQ_UNPLUG;
+                rw |= REQ_SYNC;
                 res = nilfs_segbuf_submit_bio(segbuf, &wi, rw);
         }
 
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index c3c2c7ac902..0b1e885b8cf 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -1543,8 +1543,6 @@ err_out:
  */
 const struct address_space_operations ntfs_aops = {
         .readpage       = ntfs_readpage,        /* Fill page with data. */
-        .sync_page      = block_sync_page,      /* Currently, just unplugs the
-                                                   disk request queue. */
 #ifdef NTFS_RW
         .writepage      = ntfs_writepage,       /* Write dirty page to disk. */
 #endif /* NTFS_RW */
@@ -1560,8 +1558,6 @@ const struct address_space_operations ntfs_aops = {
  */
 const struct address_space_operations ntfs_mst_aops = {
         .readpage       = ntfs_readpage,        /* Fill page with data. */
-        .sync_page      = block_sync_page,      /* Currently, just unplugs the
-                                                   disk request queue. */
 #ifdef NTFS_RW
         .writepage      = ntfs_writepage,       /* Write dirty page to disk. */
         .set_page_dirty = __set_page_dirty_nobuffers,   /* Set the page dirty
diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
index 6551c7cbad9..ef9ed854255 100644
--- a/fs/ntfs/compress.c
+++ b/fs/ntfs/compress.c
@@ -698,8 +698,7 @@ lock_retry_remap:
                                         "uptodate! Unplugging the disk queue "
                                         "and rescheduling.");
                         get_bh(tbh);
-                        blk_run_address_space(mapping);
-                        schedule();
+                        io_schedule();
                         put_bh(tbh);
                         if (unlikely(!buffer_uptodate(tbh)))
                                 goto read_err;
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 1fbb0e20131..daea0359e97 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2043,7 +2043,6 @@ const struct address_space_operations ocfs2_aops = {
         .write_begin            = ocfs2_write_begin,
         .write_end              = ocfs2_write_end,
         .bmap                   = ocfs2_bmap,
-        .sync_page              = block_sync_page,
         .direct_IO              = ocfs2_direct_IO,
         .invalidatepage         = ocfs2_invalidatepage,
         .releasepage            = ocfs2_releasepage,
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index b108e863d8f..1adab287bd2 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -367,11 +367,7 @@ static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
 static void o2hb_wait_on_io(struct o2hb_region *reg,
                             struct o2hb_bio_wait_ctxt *wc)
 {
-        struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping;
-
-        blk_run_address_space(mapping);
         o2hb_bio_wait_dec(wc, 1);
-
         wait_for_completion(&wc->wc_io_complete);
 }
 
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index 8a6d34fa668..d738a7e493d 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -372,7 +372,6 @@ const struct address_space_operations omfs_aops = {
         .readpages = omfs_readpages,
         .writepage = omfs_writepage,
         .writepages = omfs_writepages,
-        .sync_page = block_sync_page,
         .write_begin = omfs_write_begin,
         .write_end = generic_write_end,
         .bmap = omfs_bmap,
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 9c21119512b..ac546975031 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -290,7 +290,8 @@ ssize_t part_inflight_show(struct device *dev,
 {
         struct hd_struct *p = dev_to_part(dev);
 
-        return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
+        return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
+                atomic_read(&p->in_flight[1]));
 }
 
 #ifdef CONFIG_FAIL_MAKE_REQUEST
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index e63b4171d58..2b0646613f5 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -335,7 +335,6 @@ static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
 static const struct address_space_operations qnx4_aops = {
         .readpage       = qnx4_readpage,
         .writepage      = qnx4_writepage,
-        .sync_page      = block_sync_page,
         .write_begin    = qnx4_write_begin,
         .write_end      = generic_write_end,
         .bmap           = qnx4_bmap
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 1bba24bad82..4fd5bb33dbb 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -3217,7 +3217,6 @@ const struct address_space_operations reiserfs_address_space_operations = {
         .readpages = reiserfs_readpages,
         .releasepage = reiserfs_releasepage,
         .invalidatepage = reiserfs_invalidatepage,
-        .sync_page = block_sync_page,
         .write_begin = reiserfs_write_begin,
         .write_end = reiserfs_write_end,
         .bmap = reiserfs_aop_bmap,
diff --git a/fs/super.c b/fs/super.c
index e8486490826..8a06881b192 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -71,6 +71,7 @@ static struct super_block *alloc_super(struct file_system_type *type)
 #else
                 INIT_LIST_HEAD(&s->s_files);
 #endif
+                s->s_bdi = &default_backing_dev_info;
                 INIT_LIST_HEAD(&s->s_instances);
                 INIT_HLIST_BL_HEAD(&s->s_anon);
                 INIT_LIST_HEAD(&s->s_inodes);
@@ -936,6 +937,7 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
         sb = root->d_sb;
         BUG_ON(!sb);
         WARN_ON(!sb->s_bdi);
+        WARN_ON(sb->s_bdi == &default_backing_dev_info);
         sb->s_flags |= MS_BORN;
 
         error = security_sb_kern_mount(sb, flags, secdata);
diff --git a/fs/sync.c b/fs/sync.c
index 92ca208777d..c38ec163da6 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -34,7 +34,7 @@ static int __sync_filesystem(struct super_block *sb, int wait)
          * This should be safe, as we require bdi backing to actually
          * write out data in the first place
          */
-        if (!sb->s_bdi || sb->s_bdi == &noop_backing_dev_info)
+        if (sb->s_bdi == &noop_backing_dev_info)
                 return 0;
 
         if (sb->s_qcop && sb->s_qcop->quota_sync)
@@ -80,7 +80,7 @@ EXPORT_SYMBOL_GPL(sync_filesystem);
 
 static void sync_one_sb(struct super_block *sb, void *arg)
 {
-        if (!(sb->s_flags & MS_RDONLY) && sb->s_bdi)
+        if (!(sb->s_flags & MS_RDONLY))
                 __sync_filesystem(sb, *(int *)arg);
 }
 /*
diff --git a/fs/sysv/itree.c b/fs/sysv/itree.c
index 9ca66276315..fa8d43c92bb 100644
--- a/fs/sysv/itree.c
+++ b/fs/sysv/itree.c
@@ -488,7 +488,6 @@ static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations sysv_aops = {
         .readpage = sysv_readpage,
         .writepage = sysv_writepage,
-        .sync_page = block_sync_page,
         .write_begin = sysv_write_begin,
         .write_end = generic_write_end,
         .bmap = sysv_bmap
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index e5dc1e120e8..6ddd9973e68 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2011,7 +2011,6 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
          */
         c->bdi.name = "ubifs",
         c->bdi.capabilities = BDI_CAP_MAP_COPY;
-        c->bdi.unplug_io_fn = default_unplug_io_fn;
         err  = bdi_init(&c->bdi);
         if (err)
                 goto out_close;
diff --git a/fs/udf/file.c b/fs/udf/file.c
index f391a2adc69..2a346bb1d9f 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -98,7 +98,6 @@ static int udf_adinicb_write_end(struct file *file,
 const struct address_space_operations udf_adinicb_aops = {
         .readpage       = udf_adinicb_readpage,
         .writepage      = udf_adinicb_writepage,
-        .sync_page      = block_sync_page,
         .write_begin = simple_write_begin,
         .write_end = udf_adinicb_write_end,
 };
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index ccc81432141..1d1358ed80c 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -140,7 +140,6 @@ static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations udf_aops = {
         .readpage       = udf_readpage,
         .writepage      = udf_writepage,
-        .sync_page      = block_sync_page,
         .write_begin            = udf_write_begin,
         .write_end              = generic_write_end,
         .bmap           = udf_bmap,
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 03c255f12df..27a4babe7df 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -552,7 +552,6 @@ static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
 const struct address_space_operations ufs_aops = {
         .readpage = ufs_readpage,
         .writepage = ufs_writepage,
-        .sync_page = block_sync_page,
         .write_begin = ufs_write_begin,
         .write_end = generic_write_end,
         .bmap = ufs_bmap
diff --git a/fs/ufs/truncate.c b/fs/ufs/truncate.c
index e56a4f56721..11014302c9c 100644
--- a/fs/ufs/truncate.c
+++ b/fs/ufs/truncate.c
@@ -479,7 +479,7 @@ int ufs_truncate(struct inode *inode, loff_t old_i_size)
                         break;
                 if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
                         ufs_sync_inode (inode);
-                blk_run_address_space(inode->i_mapping);
+                blk_flush_plug(current);
                 yield();
         }
 
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 8c5c8727745..52dbd14260b 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -413,8 +413,7 @@ xfs_submit_ioend_bio(
         if (xfs_ioend_new_eof(ioend))
                 xfs_mark_inode_dirty(XFS_I(ioend->io_inode));
 
-        submit_bio(wbc->sync_mode == WB_SYNC_ALL ?
-                   WRITE_SYNC_PLUG : WRITE, bio);
+        submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio);
 }
 
 STATIC struct bio *
@@ -1495,7 +1494,6 @@ const struct address_space_operations xfs_address_space_operations = {
         .readpages              = xfs_vm_readpages,
         .writepage              = xfs_vm_writepage,
         .writepages             = xfs_vm_writepages,
-        .sync_page              = block_sync_page,
         .releasepage            = xfs_vm_releasepage,
         .invalidatepage         = xfs_vm_invalidatepage,
         .write_begin            = xfs_vm_write_begin,
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 5cb230f2cb4..c05324d3282 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -990,7 +990,7 @@ xfs_buf_lock(
         if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
                 xfs_log_force(bp->b_target->bt_mount, 0);
         if (atomic_read(&bp->b_io_remaining))
-                blk_run_address_space(bp->b_target->bt_mapping);
+                blk_flush_plug(current);
         down(&bp->b_sema);
         XB_SET_OWNER(bp);
 
@@ -1034,9 +1034,7 @@ xfs_buf_wait_unpin(
                 set_current_state(TASK_UNINTERRUPTIBLE);
                 if (atomic_read(&bp->b_pin_count) == 0)
                         break;
-                if (atomic_read(&bp->b_io_remaining))
-                        blk_run_address_space(bp->b_target->bt_mapping);
-                schedule();
+                io_schedule();
         }
         remove_wait_queue(&bp->b_waiters, &wait);
         set_current_state(TASK_RUNNING);
@@ -1442,7 +1440,7 @@ xfs_buf_iowait(
         trace_xfs_buf_iowait(bp, _RET_IP_);
 
         if (atomic_read(&bp->b_io_remaining))
-                blk_run_address_space(bp->b_target->bt_mapping);
+                blk_flush_plug(current);
         wait_for_completion(&bp->b_iowait);
 
         trace_xfs_buf_iowait_done(bp, _RET_IP_);
@@ -1666,7 +1664,6 @@ xfs_mapping_buftarg(
         struct inode            *inode;
         struct address_space    *mapping;
         static const struct address_space_operations mapping_aops = {
-                .sync_page = block_sync_page,
                 .migratepage = fail_migrate_page,
         };
 
@@ -1947,7 +1944,7 @@ xfsbufd(
                         count++;
                 }
                 if (count)
-                        blk_run_address_space(target->bt_mapping);
+                        blk_flush_plug(current);
 
         } while (!kthread_should_stop());
 
@@ -1995,7 +1992,7 @@ xfs_flush_buftarg(
 
         if (wait) {
                 /* Expedite and wait for IO to complete. */
-                blk_run_address_space(target->bt_mapping);
+                blk_flush_plug(current);
                 while (!list_empty(&wait_list)) {
                         bp = list_first_entry(&wait_list, struct xfs_buf, b_list);