Merge tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

Pull writeback tree from Wu Fengguang:
 "Mainly from Jan Kara to avoid iput() in the flusher threads."

* tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:
  writeback: Avoid iput() from flusher thread
  vfs: Rename end_writeback() to clear_inode()
  vfs: Move waiting for inode writeback from end_writeback() to evict_inode()
  writeback: Refactor writeback_single_inode()
  writeback: Remove wb->list_lock from writeback_single_inode()
  writeback: Separate inode requeueing after writeback
  writeback: Move I_DIRTY_PAGES handling
  writeback: Move requeueing when I_SYNC set to writeback_sb_inodes()
  writeback: Move clearing of I_SYNC into inode_sync_complete()
  writeback: initialize global_dirty_limit
  fs: remove 8 bytes of padding from struct writeback_control on 64 bit builds
  mm: page-writeback.c: local functions should not be exposed globally

56 files changed, 319 insertions, 220 deletions

diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 74acd9618819..8c91d1057d9a 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -297,7 +297,8 @@ in the beginning of ->setattr unconditionally.
 be used instead.  It gets called whenever the inode is evicted, whether it has
 remaining links or not.  Caller does *not* evict the pagecache or inode-associated
 metadata buffers; getting rid of those is responsibility of method, as it had
-been for ->delete_inode().
+been for ->delete_inode(). Caller makes sure async writeback cannot be running
+for the inode while (or after) ->evict_inode() is called.
 
         ->drop_inode() returns int now; it's called on final iput() with
 inode->i_lock held and it returns true if filesystems wants the inode to be
@@ -306,14 +307,11 @@ updated appropriately.  generic_delete_inode() is also alive and it consists
 simply of return 1.  Note that all actual eviction work is done by caller after
 ->drop_inode() returns.
 
-        clear_inode() is gone; use end_writeback() instead.  As before, it must
-be called exactly once on each call of ->evict_inode() (as it used to be for
-each call of ->delete_inode()).  Unlike before, if you are using inode-associated
-metadata buffers (i.e. mark_buffer_dirty_inode()), it's your responsibility to
-call invalidate_inode_buffers() before end_writeback().
-        No async writeback (and thus no calls of ->write_inode()) will happen
-after end_writeback() returns, so actions that should not overlap with ->write_inode()
-(e.g. freeing on-disk inode if i_nlink is 0) ought to be done after that call.
+        As before, clear_inode() must be called exactly once on each call of
+->evict_inode() (as it used to be for each call of ->delete_inode()).  Unlike
+before, if you are using inode-associated metadata buffers (i.e.
+mark_buffer_dirty_inode()), it's your responsibility to call
+invalidate_inode_buffers() before clear_inode().
 
         NOTE: checking i_nlink in the beginning of ->write_inode() and bailing out
 if it's zero is not *and* *never* *had* *been* enough.  Final unlink() and iput()
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 1d75c92ea8fb..66519d263da7 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -151,7 +151,7 @@ static void
 spufs_evict_inode(struct inode *inode)
 {
         struct spufs_inode_info *ei = SPUFS_I(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         if (ei->i_ctx)
                 put_spu_context(ei->i_ctx);
         if (ei->i_gang)
diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 6a2cb560e968..73dae8b9b77a 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -115,7 +115,7 @@ static struct inode *hypfs_make_inode(struct super_block *sb, umode_t mode)
 
 static void hypfs_evict_inode(struct inode *inode)
 {
-        end_writeback(inode);
+        clear_inode(inode);
         kfree(inode->i_private);
 }
 
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 014c8dd62962..57ccb7537dae 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -448,7 +448,7 @@ void v9fs_evict_inode(struct inode *inode)
         struct v9fs_inode *v9inode = V9FS_I(inode);
 
         truncate_inode_pages(inode->i_mapping, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         filemap_fdatawrite(inode->i_mapping);
 
 #ifdef CONFIG_9P_FSCACHE
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index 88a4b0b50058..8bc4a59f4e7e 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -264,7 +264,7 @@ affs_evict_inode(struct inode *inode)
         }
 
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         affs_free_prealloc(inode);
         cache_page = (unsigned long)AFFS_I(inode)->i_lc;
         if (cache_page) {
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index d890ae3b2ce6..95cffd38239f 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -423,7 +423,7 @@ void afs_evict_inode(struct inode *inode)
         ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
 
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
 
         afs_give_up_callback(vnode);
 
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 6e488ebe7784..8a4fed8ead30 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -100,7 +100,7 @@ static int autofs4_show_options(struct seq_file *m, struct dentry *root)
 
 static void autofs4_evict_inode(struct inode *inode)
 {
-        end_writeback(inode);
+        clear_inode(inode);
         kfree(inode->i_private);
 }
 
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index e23dc7c8b884..9870417c26e7 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -174,7 +174,7 @@ static void bfs_evict_inode(struct inode *inode)
 
         truncate_inode_pages(&inode->i_data, 0);
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
 
         if (inode->i_nlink)
                 return;
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 613aa0618235..790b3cddca67 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -505,7 +505,7 @@ static struct inode *bm_get_inode(struct super_block *sb, int mode)
 
 static void bm_evict_inode(struct inode *inode)
 {
-        end_writeback(inode);
+        clear_inode(inode);
         kfree(inode->i_private);
 }
 
diff --git a/fs/block_dev.c b/fs/block_dev.c
index ba11c30f302d..c2bbe1fb1326 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -487,7 +487,7 @@ static void bdev_evict_inode(struct inode *inode)
         struct list_head *p;
         truncate_inode_pages(&inode->i_data, 0);
         invalidate_inode_buffers(inode); /* is it needed here? */
-        end_writeback(inode);
+        clear_inode(inode);
         spin_lock(&bdev_lock);
         while ( (p = bdev->bd_inodes.next) != &bdev->bd_inodes ) {
                 __bd_forget(list_entry(p, struct inode, i_devices));
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 61b16c641ce0..ceb7b9c9edcc 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3756,7 +3756,7 @@ void btrfs_evict_inode(struct inode *inode)
         btrfs_end_transaction(trans, root);
         btrfs_btree_balance_dirty(root, nr);
 no_delete:
-        end_writeback(inode);
+        clear_inode(inode);
         return;
 }
 
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 541ef81f6ae8..0a0fa0250e99 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -272,7 +272,7 @@ static void
 cifs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         cifs_fscache_release_inode_cookie(inode);
 }
 
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index 2870597b5c9d..f1813120d753 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -244,7 +244,7 @@ static void coda_put_super(struct super_block *sb)
 static void coda_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         coda_cache_clear_inode(inode);
 }
 
diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index 2dd946b636d2..e879cf8ff0b1 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -133,7 +133,7 @@ static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 static void ecryptfs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         iput(ecryptfs_inode_to_lower(inode));
 }
 
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index ea5e1f97806a..5badb0c039de 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -1473,7 +1473,7 @@ void exofs_evict_inode(struct inode *inode)
                 goto no_delete;
 
         inode->i_size = 0;
-        end_writeback(inode);
+        clear_inode(inode);
 
         /* if we are deleting an obj that hasn't been created yet, wait.
          * This also makes sure that create_done cannot be called with an
@@ -1503,5 +1503,5 @@ void exofs_evict_inode(struct inode *inode)
         return;
 
 no_delete:
-        end_writeback(inode);
+        clear_inode(inode);
 }
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index f9fa95f8443d..264d315f6c47 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -90,7 +90,7 @@ void ext2_evict_inode(struct inode * inode)
         }
 
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
 
         ext2_discard_reservation(inode);
         rsv = EXT2_I(inode)->i_block_alloc_info;
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index a09790a412b1..9a4a5c48b1c9 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -272,18 +272,18 @@ void ext3_evict_inode (struct inode *inode)
         if (ext3_mark_inode_dirty(handle, inode)) {
                 /* If that failed, just dquot_drop() and be done with that */
                 dquot_drop(inode);
-                end_writeback(inode);
+                clear_inode(inode);
         } else {
                 ext3_xattr_delete_inode(handle, inode);
                 dquot_free_inode(inode);
                 dquot_drop(inode);
-                end_writeback(inode);
+                clear_inode(inode);
                 ext3_free_inode(handle, inode);
         }
         ext3_journal_stop(handle);
         return;
 no_delete:
-        end_writeback(inode);
+        clear_inode(inode);
         dquot_drop(inode);
 }
 
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1867a98e0c49..35b5954489ee 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1007,7 +1007,7 @@ static void destroy_inodecache(void)
 void ext4_clear_inode(struct inode *inode)
 {
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         dquot_drop(inode);
         ext4_discard_preallocations(inode);
         if (EXT4_I(inode)->jinode) {
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 21687e31acc0..b3d290c1b513 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -454,7 +454,7 @@ static void fat_evict_inode(struct inode *inode)
                 fat_truncate_blocks(inode, 0);
         }
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         fat_cache_inval_inode(inode);
         fat_detach(inode);
 }
diff --git a/fs/freevxfs/vxfs_inode.c b/fs/freevxfs/vxfs_inode.c
index cf9ef918a2a9..ef67c95f12d4 100644
--- a/fs/freevxfs/vxfs_inode.c
+++ b/fs/freevxfs/vxfs_inode.c
@@ -355,6 +355,6 @@ void
 vxfs_evict_inode(struct inode *ip)
 {
         truncate_inode_pages(&ip->i_data, 0);
-        end_writeback(ip);
+        clear_inode(ip);
         call_rcu(&ip->i_rcu, vxfs_i_callback);
 }
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 539f36cf3e4a..8d2fb8c88cf3 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -231,11 +231,8 @@ static void requeue_io(struct inode *inode, struct bdi_writeback *wb)
 
 static void inode_sync_complete(struct inode *inode)
 {
-        /*
-         * Prevent speculative execution through
-         * spin_unlock(&wb->list_lock);
-         */
-
+        inode->i_state &= ~I_SYNC;
+        /* Waiters must see I_SYNC cleared before being woken up */
         smp_mb();
         wake_up_bit(&inode->i_state, __I_SYNC);
 }
@@ -329,10 +326,12 @@ static int write_inode(struct inode *inode, struct writeback_control *wbc)
 }
 
 /*
- * Wait for writeback on an inode to complete.
+ * Wait for writeback on an inode to complete. Called with i_lock held.
+ * Caller must make sure inode cannot go away when we drop i_lock.
  */
-static void inode_wait_for_writeback(struct inode *inode,
-                                     struct bdi_writeback *wb)
+static void __inode_wait_for_writeback(struct inode *inode)
+        __releases(inode->i_lock)
+        __acquires(inode->i_lock)
 {
         DEFINE_WAIT_BIT(wq, &inode->i_state, __I_SYNC);
         wait_queue_head_t *wqh;
@@ -340,70 +339,119 @@ static void inode_wait_for_writeback(struct inode *inode,
         wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
         while (inode->i_state & I_SYNC) {
                 spin_unlock(&inode->i_lock);
-                spin_unlock(&wb->list_lock);
                 __wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE);
-                spin_lock(&wb->list_lock);
                 spin_lock(&inode->i_lock);
         }
 }
 
 /*
- * Write out an inode's dirty pages.  Called under wb->list_lock and
- * inode->i_lock.  Either the caller has an active reference on the inode or
- * the inode has I_WILL_FREE set.
- *
- * If `wait' is set, wait on the writeout.
- *
- * The whole writeout design is quite complex and fragile.  We want to avoid
- * starvation of particular inodes when others are being redirtied, prevent
- * livelocks, etc.
+ * Wait for writeback on an inode to complete. Caller must have inode pinned.
  */
-static int
-writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
-                       struct writeback_control *wbc)
+void inode_wait_for_writeback(struct inode *inode)
 {
-        struct address_space *mapping = inode->i_mapping;
-        long nr_to_write = wbc->nr_to_write;
-        unsigned dirty;
-        int ret;
+        spin_lock(&inode->i_lock);
+        __inode_wait_for_writeback(inode);
+        spin_unlock(&inode->i_lock);
+}
 
-        assert_spin_locked(&wb->list_lock);
-        assert_spin_locked(&inode->i_lock);
+/*
+ * Sleep until I_SYNC is cleared. This function must be called with i_lock
+ * held and drops it. It is aimed for callers not holding any inode reference
+ * so once i_lock is dropped, inode can go away.
+ */
+static void inode_sleep_on_writeback(struct inode *inode)
+        __releases(inode->i_lock)
+{
+        DEFINE_WAIT(wait);
+        wait_queue_head_t *wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
+        int sleep;
 
-        if (!atomic_read(&inode->i_count))
-                WARN_ON(!(inode->i_state & (I_WILL_FREE|I_FREEING)));
-        else
-                WARN_ON(inode->i_state & I_WILL_FREE);
+        prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
+        sleep = inode->i_state & I_SYNC;
+        spin_unlock(&inode->i_lock);
+        if (sleep)
+                schedule();
+        finish_wait(wqh, &wait);
+}
 
-        if (inode->i_state & I_SYNC) {
+/*
+ * Find proper writeback list for the inode depending on its current state and
+ * possibly also change of its state while we were doing writeback.  Here we
+ * handle things such as livelock prevention or fairness of writeback among
+ * inodes. This function can be called only by flusher thread - noone else
+ * processes all inodes in writeback lists and requeueing inodes behind flusher
+ * thread's back can have unexpected consequences.
+ */
+static void requeue_inode(struct inode *inode, struct bdi_writeback *wb,
+                          struct writeback_control *wbc)
+{
+        if (inode->i_state & I_FREEING)
+                return;
+
+        /*
+         * Sync livelock prevention. Each inode is tagged and synced in one
+         * shot. If still dirty, it will be redirty_tail()'ed below.  Update
+         * the dirty time to prevent enqueue and sync it again.
+         */
+        if ((inode->i_state & I_DIRTY) &&
+            (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages))
+                inode->dirtied_when = jiffies;
+
+        if (wbc->pages_skipped) {
                 /*
-                 * If this inode is locked for writeback and we are not doing
-                 * writeback-for-data-integrity, move it to b_more_io so that
-                 * writeback can proceed with the other inodes on s_io.
-                 *
-                 * We'll have another go at writing back this inode when we
-                 * completed a full scan of b_io.
+                 * writeback is not making progress due to locked
+                 * buffers. Skip this inode for now.
                  */
-                if (wbc->sync_mode != WB_SYNC_ALL) {
+                redirty_tail(inode, wb);
+                return;
+        }
+
+        if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY)) {
+                /*
+                 * We didn't write back all the pages.  nfs_writepages()
+                 * sometimes bales out without doing anything.
+                 */
+                if (wbc->nr_to_write <= 0) {
+                        /* Slice used up. Queue for next turn. */
                         requeue_io(inode, wb);
-                        trace_writeback_single_inode_requeue(inode, wbc,
-                                                             nr_to_write);
-                        return 0;
+                } else {
+                        /*
+                         * Writeback blocked by something other than
+                         * congestion. Delay the inode for some time to
+                         * avoid spinning on the CPU (100% iowait)
+                         * retrying writeback of the dirty page/inode
+                         * that cannot be performed immediately.
+                         */
+                        redirty_tail(inode, wb);
                 }
-
+        } else if (inode->i_state & I_DIRTY) {
                 /*
-                 * It's a data-integrity sync.  We must wait.
+                 * Filesystems can dirty the inode during writeback operations,
+                 * such as delayed allocation during submission or metadata
+                 * updates after data IO completion.
                  */
-                inode_wait_for_writeback(inode, wb);
+                redirty_tail(inode, wb);
+        } else {
+                /* The inode is clean. Remove from writeback lists. */
+                list_del_init(&inode->i_wb_list);
         }
+}
 
-        BUG_ON(inode->i_state & I_SYNC);
+/*
+ * Write out an inode and its dirty pages. Do not update the writeback list
+ * linkage. That is left to the caller. The caller is also responsible for
+ * setting I_SYNC flag and calling inode_sync_complete() to clear it.
+ */
+static int
+__writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
+                         struct writeback_control *wbc)
+{
+        struct address_space *mapping = inode->i_mapping;
+        long nr_to_write = wbc->nr_to_write;
+        unsigned dirty;
+        int ret;
 
-        /* Set I_SYNC, reset I_DIRTY_PAGES */
-        inode->i_state |= I_SYNC;
-        inode->i_state &= ~I_DIRTY_PAGES;
-        spin_unlock(&inode->i_lock);
-        spin_unlock(&wb->list_lock);
+        WARN_ON(!(inode->i_state & I_SYNC));
 
         ret = do_writepages(mapping, wbc);
 
@@ -424,6 +472,9 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
          * write_inode()
          */
         spin_lock(&inode->i_lock);
+        /* Clear I_DIRTY_PAGES if we've written out all dirty pages */
+        if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
+                inode->i_state &= ~I_DIRTY_PAGES;
         dirty = inode->i_state & I_DIRTY;
         inode->i_state &= ~(I_DIRTY_SYNC | I_DIRTY_DATASYNC);
         spin_unlock(&inode->i_lock);
@@ -433,60 +484,67 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
                 if (ret == 0)
                         ret = err;
         }
+        trace_writeback_single_inode(inode, wbc, nr_to_write);
+        return ret;
+}
+
+/*
+ * Write out an inode's dirty pages. Either the caller has an active reference
+ * on the inode or the inode has I_WILL_FREE set.
+ *
+ * This function is designed to be called for writing back one inode which
+ * we go e.g. from filesystem. Flusher thread uses __writeback_single_inode()
+ * and does more profound writeback list handling in writeback_sb_inodes().
+ */
+static int
+writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
+                       struct writeback_control *wbc)
+{
+        int ret = 0;
 
-        spin_lock(&wb->list_lock);
         spin_lock(&inode->i_lock);
-        inode->i_state &= ~I_SYNC;
-        if (!(inode->i_state & I_FREEING)) {
+        if (!atomic_read(&inode->i_count))
+                WARN_ON(!(inode->i_state & (I_WILL_FREE|I_FREEING)));
+        else
+                WARN_ON(inode->i_state & I_WILL_FREE);
+
+        if (inode->i_state & I_SYNC) {
+                if (wbc->sync_mode != WB_SYNC_ALL)
+                        goto out;
                 /*
-                 * Sync livelock prevention. Each inode is tagged and synced in
-                 * one shot. If still dirty, it will be redirty_tail()'ed below.
-                 * Update the dirty time to prevent enqueue and sync it again.
+                 * It's a data-integrity sync. We must wait. Since callers hold
+                 * inode reference or inode has I_WILL_FREE set, it cannot go
+                 * away under us.
                  */
-                if ((inode->i_state & I_DIRTY) &&
-                    (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages))
-                        inode->dirtied_when = jiffies;
-
-                if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
-                        /*
-                         * We didn't write back all the pages.  nfs_writepages()
-                         * sometimes bales out without doing anything.
-                         */
-                        inode->i_state |= I_DIRTY_PAGES;
-                        if (wbc->nr_to_write <= 0) {
-                                /*
-                                 * slice used up: queue for next turn
-                                 */
-                                requeue_io(inode, wb);
-                        } else {
-                                /*
-                                 * Writeback blocked by something other than
-                                 * congestion. Delay the inode for some time to
-                                 * avoid spinning on the CPU (100% iowait)
-                                 * retrying writeback of the dirty page/inode
-                                 * that cannot be performed immediately.
-                                 */
-                                redirty_tail(inode, wb);
-                        }
-                } else if (inode->i_state & I_DIRTY) {
-                        /*
-                         * Filesystems can dirty the inode during writeback
-                         * operations, such as delayed allocation during
-                         * submission or metadata updates after data IO
-                         * completion.
-                         */
-                        redirty_tail(inode, wb);
-                } else {
-                        /*
-                         * The inode is clean.  At this point we either have
-                         * a reference to the inode or it's on it's way out.
-                         * No need to add it back to the LRU.
-                         */
-                        list_del_init(&inode->i_wb_list);
-                }
+                __inode_wait_for_writeback(inode);
         }
+        WARN_ON(inode->i_state & I_SYNC);
+        /*
+         * Skip inode if it is clean. We don't want to mess with writeback
+         * lists in this function since flusher thread may be doing for example
+         * sync in parallel and if we move the inode, it could get skipped. So
+         * here we make sure inode is on some writeback list and leave it there
+         * unless we have completely cleaned the inode.
+         */
+        if (!(inode->i_state & I_DIRTY))
+                goto out;
+        inode->i_state |= I_SYNC;
+        spin_unlock(&inode->i_lock);
+
+        ret = __writeback_single_inode(inode, wb, wbc);
+
+        spin_lock(&wb->list_lock);
+        spin_lock(&inode->i_lock);
+        /*
+         * If inode is clean, remove it from writeback lists. Otherwise don't
+         * touch it. See comment above for explanation.
+         */
+        if (!(inode->i_state & I_DIRTY))
+                list_del_init(&inode->i_wb_list);
+        spin_unlock(&wb->list_lock);
         inode_sync_complete(inode);
-        trace_writeback_single_inode(inode, wbc, nr_to_write);
+out:
+        spin_unlock(&inode->i_lock);
         return ret;
 }
 
@@ -580,29 +638,57 @@ static long writeback_sb_inodes(struct super_block *sb,
                         redirty_tail(inode, wb);
                         continue;
                 }
-                __iget(inode);
+                if ((inode->i_state & I_SYNC) && wbc.sync_mode != WB_SYNC_ALL) {
+                        /*
+                         * If this inode is locked for writeback and we are not
+                         * doing writeback-for-data-integrity, move it to
+                         * b_more_io so that writeback can proceed with the
+                         * other inodes on s_io.
+                         *
+                         * We'll have another go at writing back this inode
+                         * when we completed a full scan of b_io.
+                         */
+                        spin_unlock(&inode->i_lock);
+                        requeue_io(inode, wb);
+                        trace_writeback_sb_inodes_requeue(inode);
+                        continue;
+                }
+                spin_unlock(&wb->list_lock);
+
+                /*
+                 * We already requeued the inode if it had I_SYNC set and we
+                 * are doing WB_SYNC_NONE writeback. So this catches only the
+                 * WB_SYNC_ALL case.
+                 */
+                if (inode->i_state & I_SYNC) {
+                        /* Wait for I_SYNC. This function drops i_lock... */
+                        inode_sleep_on_writeback(inode);
+                        /* Inode may be gone, start again */
+                        continue;
+                }
+                inode->i_state |= I_SYNC;
+                spin_unlock(&inode->i_lock);
+
                 write_chunk = writeback_chunk_size(wb->bdi, work);
                 wbc.nr_to_write = write_chunk;
                 wbc.pages_skipped = 0;
 
-                writeback_single_inode(inode, wb, &wbc);
+                /*
+                 * We use I_SYNC to pin the inode in memory. While it is set
+                 * evict_inode() will wait so the inode cannot be freed.
+                 */
+                __writeback_single_inode(inode, wb, &wbc);
 
                 work->nr_pages -= write_chunk - wbc.nr_to_write;
                 wrote += write_chunk - wbc.nr_to_write;
+                spin_lock(&wb->list_lock);
+                spin_lock(&inode->i_lock);
                 if (!(inode->i_state & I_DIRTY))
                         wrote++;
-                if (wbc.pages_skipped) {
-                        /*
-                         * writeback is not making progress due to locked
-                         * buffers.  Skip this inode for now.
-                         */
-                        redirty_tail(inode, wb);
-                }
+                requeue_inode(inode, wb, &wbc);
+                inode_sync_complete(inode);
                 spin_unlock(&inode->i_lock);
-                spin_unlock(&wb->list_lock);
-                iput(inode);
-                cond_resched();
-                spin_lock(&wb->list_lock);
+                cond_resched_lock(&wb->list_lock);
                 /*
                  * bail out to wb_writeback() often enough to check
                  * background threshold and other termination conditions.
@@ -796,8 +882,10 @@ static long wb_writeback(struct bdi_writeback *wb,
                         trace_writeback_wait(wb->bdi, work);
                         inode = wb_inode(wb->b_more_io.prev);
                         spin_lock(&inode->i_lock);
-                        inode_wait_for_writeback(inode, wb);
-                        spin_unlock(&inode->i_lock);
+                        spin_unlock(&wb->list_lock);
+                        /* This function drops i_lock... */
+                        inode_sleep_on_writeback(inode);
+                        spin_lock(&wb->list_lock);
                 }
         }
         spin_unlock(&wb->list_lock);
@@ -1331,7 +1419,6 @@ EXPORT_SYMBOL(sync_inodes_sb);
 int write_inode_now(struct inode *inode, int sync)
 {
         struct bdi_writeback *wb = &inode_to_bdi(inode)->wb;
-        int ret;
         struct writeback_control wbc = {
                 .nr_to_write = LONG_MAX,
                 .sync_mode = sync ? WB_SYNC_ALL : WB_SYNC_NONE,
@@ -1343,12 +1430,7 @@ int write_inode_now(struct inode *inode, int sync)
                 wbc.nr_to_write = 0;
 
         might_sleep();
-        spin_lock(&wb->list_lock);
-        spin_lock(&inode->i_lock);
-        ret = writeback_single_inode(inode, wb, &wbc);
-        spin_unlock(&inode->i_lock);
-        spin_unlock(&wb->list_lock);
-        return ret;
+        return writeback_single_inode(inode, wb, &wbc);
 }
 EXPORT_SYMBOL(write_inode_now);
 
@@ -1365,15 +1447,7 @@ EXPORT_SYMBOL(write_inode_now);
  */
 int sync_inode(struct inode *inode, struct writeback_control *wbc)
 {
-        struct bdi_writeback *wb = &inode_to_bdi(inode)->wb;
-        int ret;
-
-        spin_lock(&wb->list_lock);
-        spin_lock(&inode->i_lock);
-        ret = writeback_single_inode(inode, wb, wbc);
-        spin_unlock(&inode->i_lock);
-        spin_unlock(&wb->list_lock);
-        return ret;
+        return writeback_single_inode(inode, &inode_to_bdi(inode)->wb, wbc);
 }
 EXPORT_SYMBOL(sync_inode);
 
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 26783eb2b1fc..56f6dcf30768 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -122,7 +122,7 @@ static void fuse_destroy_inode(struct inode *inode)
 static void fuse_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         if (inode->i_sb->s_flags & MS_ACTIVE) {
                 struct fuse_conn *fc = get_fuse_conn(inode);
                 struct fuse_inode *fi = get_fuse_inode(inode);
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 6172fa77ad59..713e621c240b 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1554,7 +1554,7 @@ out_unlock:
 out:
         /* Case 3 starts here */
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         gfs2_dir_hash_inval(ip);
         ip->i_gl->gl_object = NULL;
         flush_delayed_work_sync(&ip->i_gl->gl_work);
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 737dbeb64320..761ec06354b4 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -532,7 +532,7 @@ out:
 void hfs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
                 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
                 iput(HFS_I(inode)->rsrc_inode);
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index ceb1c281eefb..a9bca4b8768b 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -154,7 +154,7 @@ static void hfsplus_evict_inode(struct inode *inode)
 {
         dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         if (HFSPLUS_IS_RSRC(inode)) {
                 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
                 iput(HFSPLUS_I(inode)->rsrc_inode);
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 07c516bfea76..2afa5bbccf9b 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -240,7 +240,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
 static void hostfs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         if (HOSTFS_I(inode)->fd != -1) {
                 close_file(&HOSTFS_I(inode)->fd);
                 HOSTFS_I(inode)->fd = -1;
diff --git a/fs/hpfs/inode.c b/fs/hpfs/inode.c
index 3b2cec29972b..b43066cbdc6a 100644
--- a/fs/hpfs/inode.c
+++ b/fs/hpfs/inode.c
@@ -299,7 +299,7 @@ void hpfs_write_if_changed(struct inode *inode)
 void hpfs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         if (!inode->i_nlink) {
                 hpfs_lock(inode->i_sb);
                 hpfs_remove_fnode(inode->i_sb, inode->i_ino);
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index a80e45a690ac..d4f93b52cec5 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -614,7 +614,7 @@ static struct inode *hppfs_alloc_inode(struct super_block *sb)
 
 void hppfs_evict_inode(struct inode *ino)
 {
-        end_writeback(ino);
+        clear_inode(ino);
         dput(HPPFS_I(ino)->proc_dentry);
         mntput(ino->i_sb->s_fs_info);
 }
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 001ef01d2fe2..cc9281b6c628 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -393,7 +393,7 @@ static void truncate_hugepages(struct inode *inode, loff_t lstart)
 static void hugetlbfs_evict_inode(struct inode *inode)
 {
         truncate_hugepages(inode, 0);
-        end_writeback(inode);
+        clear_inode(inode);
 }
 
 static inline void
diff --git a/fs/inode.c b/fs/inode.c
index da93f7d160d4..6bc8761cc333 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -486,7 +486,7 @@ void __remove_inode_hash(struct inode *inode)
 }
 EXPORT_SYMBOL(__remove_inode_hash);
 
-void end_writeback(struct inode *inode)
+void clear_inode(struct inode *inode)
 {
         might_sleep();
         /*
@@ -500,11 +500,10 @@ void end_writeback(struct inode *inode)
         BUG_ON(!list_empty(&inode->i_data.private_list));
         BUG_ON(!(inode->i_state & I_FREEING));
         BUG_ON(inode->i_state & I_CLEAR);
-        inode_sync_wait(inode);
         /* don't need i_lock here, no concurrent mods to i_state */
         inode->i_state = I_FREEING | I_CLEAR;
 }
-EXPORT_SYMBOL(end_writeback);
+EXPORT_SYMBOL(clear_inode);
 
 /*
  * Free the inode passed in, removing it from the lists it is still connected
@@ -531,12 +530,20 @@ static void evict(struct inode *inode)
 
         inode_sb_list_del(inode);
 
+        /*
+         * Wait for flusher thread to be done with the inode so that filesystem
+         * does not start destroying it while writeback is still running. Since
+         * the inode has I_FREEING set, flusher thread won't start new work on
+         * the inode.  We just have to wait for running writeback to finish.
+         */
+        inode_wait_for_writeback(inode);
+
         if (op->evict_inode) {
                 op->evict_inode(inode);
         } else {
                 if (inode->i_data.nrpages)
                         truncate_inode_pages(&inode->i_data, 0);
-                end_writeback(inode);
+                clear_inode(inode);
         }
         if (S_ISBLK(inode->i_mode) && inode->i_bdev)
                 bd_forget(inode);
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index bb6f993ebca9..3d3092eda811 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -240,7 +240,7 @@ void jffs2_evict_inode (struct inode *inode)
         jffs2_dbg(1, "%s(): ino #%lu mode %o\n",
                   __func__, inode->i_ino, inode->i_mode);
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         jffs2_do_clear_inode(c, f);
 }
 
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 77b69b27f825..4692bf3ca8cb 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -169,7 +169,7 @@ void jfs_evict_inode(struct inode *inode)
         } else {
                 truncate_inode_pages(&inode->i_data, 0);
         }
-        end_writeback(inode);
+        clear_inode(inode);
         dquot_drop(inode);
 }
 
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index e3ab5e5a904c..f1cb512c5019 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -2175,7 +2175,7 @@ void logfs_evict_inode(struct inode *inode)
                 }
         }
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
 
         /* Cheaper version of write_inode.  All changes are concealed in
          * aliases, which are moved back.  No write to the medium happens.
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index fcb05d2c6b5f..2a503ad020d5 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -32,7 +32,7 @@ static void minix_evict_inode(struct inode *inode)
                 minix_truncate(inode);
         }
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         if (!inode->i_nlink)
                 minix_free_inode(inode);
 }
diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c
index 87484fb8d177..333df07ae3bd 100644
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
@@ -292,7 +292,7 @@ static void
 ncp_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
 
         if (S_ISDIR(inode->i_mode)) {
                 DDPRINTK("ncp_evict_inode: put directory %ld\n", inode->i_ino);
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index e8bbfa5b3500..c6073139b402 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -121,7 +121,7 @@ static void nfs_clear_inode(struct inode *inode)
 void nfs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         nfs_clear_inode(inode);
 }
 
@@ -1500,7 +1500,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 void nfs4_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         pnfs_return_layout(inode);
         pnfs_destroy_layout(NFS_I(inode));
         /* If we are holding a delegation, return it! */
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 8f7b95ac1f7e..7cc64465ec26 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -734,7 +734,7 @@ void nilfs_evict_inode(struct inode *inode)
         if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
                 if (inode->i_data.nrpages)
                         truncate_inode_pages(&inode->i_data, 0);
-                end_writeback(inode);
+                clear_inode(inode);
                 nilfs_clear_inode(inode);
                 return;
         }
@@ -746,7 +746,7 @@ void nilfs_evict_inode(struct inode *inode)
         /* TODO: some of the following operations may fail.  */
         nilfs_truncate_bmap(ii, 0);
         nilfs_mark_inode_dirty(inode);
-        end_writeback(inode);
+        clear_inode(inode);
 
         ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
         if (!ret)
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index 2eaa66652944..c6dbd3db6ca8 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -2258,7 +2258,7 @@ void ntfs_evict_big_inode(struct inode *vi)
         ntfs_inode *ni = NTFS_I(vi);
 
         truncate_inode_pages(&vi->i_data, 0);
-        end_writeback(vi);
+        clear_inode(vi);
 
 #ifdef NTFS_RW
         if (NInoDirty(ni)) {
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 3b5825ef3193..e31d6ae013ab 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -367,7 +367,7 @@ static void dlmfs_evict_inode(struct inode *inode)
         int status;
         struct dlmfs_inode_private *ip;
 
-        end_writeback(inode);
+        clear_inode(inode);
 
         mlog(0, "inode %lu\n", inode->i_ino);
 
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 17454a904d7b..735514ca400f 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1069,7 +1069,7 @@ static void ocfs2_clear_inode(struct inode *inode)
         int status;
         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 
-        end_writeback(inode);
+        clear_inode(inode);
         trace_ocfs2_clear_inode((unsigned long long)oi->ip_blkno,
                                 inode->i_nlink);
 
diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index dbc842222589..e6213b3725d1 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -184,7 +184,7 @@ int omfs_sync_inode(struct inode *inode)
 static void omfs_evict_inode(struct inode *inode)
 {
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
 
         if (inode->i_nlink)
                 return;
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 554ecc54799f..7ac817b64a71 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -33,7 +33,7 @@ static void proc_evict_inode(struct inode *inode)
         const struct proc_ns_operations *ns_ops;
 
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
 
         /* Stop tracking associated processes */
         put_pid(PROC_I(inode)->pid);
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 19507889bb7f..aeb19e68e086 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -85,7 +85,7 @@ static void pstore_evict_inode(struct inode *inode)
         struct pstore_private   *p = inode->i_private;
         unsigned long           flags;
 
-        end_writeback(inode);
+        clear_inode(inode);
         if (p) {
                 spin_lock_irqsave(&allpstore_lock, flags);
                 list_del(&p->list);
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 494c315c7417..59d06871a850 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -76,14 +76,14 @@ void reiserfs_evict_inode(struct inode *inode)
                 ;
         }
       out:
-        end_writeback(inode);   /* note this must go after the journal_end to prevent deadlock */
+        clear_inode(inode);     /* note this must go after the journal_end to prevent deadlock */
         dquot_drop(inode);
         inode->i_blocks = 0;
         reiserfs_write_unlock_once(inode->i_sb, depth);
         return;
 
 no_delete:
-        end_writeback(inode);
+        clear_inode(inode);
         dquot_drop(inode);
 }
 
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 907c2b3af758..0ce3ccf7f401 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -310,7 +310,7 @@ void sysfs_evict_inode(struct inode *inode)
         struct sysfs_dirent *sd  = inode->i_private;
 
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         sysfs_put(sd);
 }
 
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index 3da5ce25faf0..08d0b2568cd3 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -316,7 +316,7 @@ static void sysv_evict_inode(struct inode *inode)
                 sysv_truncate(inode);
         }
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         if (!inode->i_nlink)
                 sysv_free_inode(inode);
 }
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 001acccac0d6..5862dd9d2784 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -378,7 +378,7 @@ out:
                 smp_wmb();
         }
 done:
-        end_writeback(inode);
+        clear_inode(inode);
 }
 
 static void ubifs_dirty_inode(struct inode *inode, int flags)
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 7d7528008359..873e1bab9c4c 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -80,7 +80,7 @@ void udf_evict_inode(struct inode *inode)
         } else
                 truncate_inode_pages(&inode->i_data, 0);
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
             inode->i_size != iinfo->i_lenExtents) {
                 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 7cdd3953d67e..dd7c89d8a1c1 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -895,7 +895,7 @@ void ufs_evict_inode(struct inode * inode)
         }
 
         invalidate_inode_buffers(inode);
-        end_writeback(inode);
+        clear_inode(inode);
 
         if (want_delete) {
                 lock_ufs(inode->i_sb);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 2fcfd5b0b046..0d9de41a7151 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -932,7 +932,7 @@ xfs_fs_evict_inode(
         trace_xfs_evict_inode(ip);
 
         truncate_inode_pages(&inode->i_data, 0);
-        end_writeback(inode);
+        clear_inode(inode);
         XFS_STATS_INC(vn_rele);
         XFS_STATS_INC(vn_remove);
         XFS_STATS_DEC(vn_active);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c0e53372b082..cdc1a9630948 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1764,8 +1764,8 @@ struct super_operations {
  * I_FREEING            Set when inode is about to be freed but still has dirty
  *                      pages or buffers attached or the inode itself is still
  *                      dirty.
- * I_CLEAR              Added by end_writeback().  In this state the inode is clean
- *                      and can be destroyed.  Inode keeps I_FREEING.
+ * I_CLEAR              Added by clear_inode().  In this state the inode is
+ *                      clean and can be destroyed.  Inode keeps I_FREEING.
  *
  *                      Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are
  *                      prohibited for many purposes.  iget() must wait for
@@ -1773,9 +1773,10 @@ struct super_operations {
  *                      anew.  Other functions will just ignore such inodes,
  *                      if appropriate.  I_NEW is used for waiting.
  *
- * I_SYNC               Synchonized write of dirty inode data.  The bits is
- *                      set during data writeback, and cleared with a wakeup
- *                      on the bit address once it is done.
+ * I_SYNC               Writeback of inode is running. The bit is set during
+ *                      data writeback, and cleared with a wakeup on the bit
+ *                      address once it is done. The bit is also used to pin
+ *                      the inode in memory for flusher thread.
  *
  * I_REFERENCED         Marks the inode as recently references on the LRU list.
  *
@@ -2349,7 +2350,7 @@ extern unsigned int get_next_ino(void);
 
 extern void __iget(struct inode * inode);
 extern void iget_failed(struct inode *);
-extern void end_writeback(struct inode *);
+extern void clear_inode(struct inode *);
 extern void __destroy_inode(struct inode *);
 extern struct inode *new_inode_pseudo(struct super_block *sb);
 extern struct inode *new_inode(struct super_block *sb);
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index a2b84f598e2b..6d0a0fcd80e7 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -58,7 +58,6 @@ extern const char *wb_reason_name[];
  * in a manner such that unspecified fields are set to zero.
  */
 struct writeback_control {
-        enum writeback_sync_modes sync_mode;
         long nr_to_write;               /* Write this many pages, and decrement
                                            this for each page written */
         long pages_skipped;             /* Pages which were not written */
@@ -71,6 +70,8 @@ struct writeback_control {
         loff_t range_start;
         loff_t range_end;
 
+        enum writeback_sync_modes sync_mode;
+
         unsigned for_kupdate:1;         /* A kupdate writeback */
         unsigned for_background:1;      /* A background writeback */
         unsigned tagged_writepages:1;   /* tag-and-write to avoid livelock */
@@ -94,6 +95,7 @@ long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
                                 enum wb_reason reason);
 long wb_do_writeback(struct bdi_writeback *wb, int force_wait);
 void wakeup_flusher_threads(long nr_pages, enum wb_reason reason);
+void inode_wait_for_writeback(struct inode *inode);
 
 /* writeback.h requires fs.h; it, too, is not included from here. */
 static inline void wait_on_inode(struct inode *inode)
@@ -101,12 +103,6 @@ static inline void wait_on_inode(struct inode *inode)
         might_sleep();
         wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE);
 }
-static inline void inode_sync_wait(struct inode *inode)
-{
-        might_sleep();
-        wait_on_bit(&inode->i_state, __I_SYNC, inode_wait,
-                                                        TASK_UNINTERRUPTIBLE);
-}
 
 
 /*
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 7b81887b023f..b453d92c2253 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -372,6 +372,35 @@ TRACE_EVENT(balance_dirty_pages,
           )
 );
 
+TRACE_EVENT(writeback_sb_inodes_requeue,
+
+        TP_PROTO(struct inode *inode),
+        TP_ARGS(inode),
+
+        TP_STRUCT__entry(
+                __array(char, name, 32)
+                __field(unsigned long, ino)
+                __field(unsigned long, state)
+                __field(unsigned long, dirtied_when)
+        ),
+
+        TP_fast_assign(
+                strncpy(__entry->name,
+                        dev_name(inode_to_bdi(inode)->dev), 32);
+                __entry->ino            = inode->i_ino;
+                __entry->state          = inode->i_state;
+                __entry->dirtied_when   = inode->dirtied_when;
+        ),
+
+        TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu",
+                  __entry->name,
+                  __entry->ino,
+                  show_inode_state(__entry->state),
+                  __entry->dirtied_when,
+                  (jiffies - __entry->dirtied_when) / HZ
+        )
+);
+
 DECLARE_EVENT_CLASS(writeback_congest_waited_template,
 
         TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),
@@ -450,13 +479,6 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
         )
 );
 
-DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode_requeue,
-        TP_PROTO(struct inode *inode,
-                 struct writeback_control *wbc,
-                 unsigned long nr_to_write),
-        TP_ARGS(inode, wbc, nr_to_write)
-);
-
 DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode,
         TP_PROTO(struct inode *inode,
                  struct writeback_control *wbc,
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index b6a0d46fbad7..a2757d4ab773 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -251,7 +251,7 @@ static void mqueue_evict_inode(struct inode *inode)
         int i;
         struct ipc_namespace *ipc_ns;
 
-        end_writeback(inode);
+        clear_inode(inode);
 
         if (S_ISDIR(inode->i_mode))
                 return;
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 26adea8ca2e7..93d8d2f7108c 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -204,7 +204,7 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
  * Returns the global number of pages potentially available for dirty
  * page cache.  This is the base value for the global dirty limits.
  */
-unsigned long global_dirtyable_memory(void)
+static unsigned long global_dirtyable_memory(void)
 {
         unsigned long x;
 
@@ -1568,6 +1568,7 @@ void writeback_set_ratelimit(void)
         unsigned long background_thresh;
         unsigned long dirty_thresh;
         global_dirty_limits(&background_thresh, &dirty_thresh);
+        global_dirty_limit = dirty_thresh;
         ratelimit_pages = dirty_thresh / (num_online_cpus() * 32);
         if (ratelimit_pages < 16)
                 ratelimit_pages = 16;
diff --git a/mm/shmem.c b/mm/shmem.c
index d7b433a1ef5e..be5af34a070d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -597,7 +597,7 @@ static void shmem_evict_inode(struct inode *inode)
         }
         BUG_ON(inode->i_blocks);
         shmem_free_inode(inode->i_sb);
-        end_writeback(inode);
+        clear_inode(inode);
 }
 
 /*