Revert "writeback: fix WB_SYNC_NONE writeback from umount"

This reverts commit e913fc825dc685a444cb4c1d0f9d32f372f59861.

We are investigating a hang associated with the WB_SYNC_NONE changes,
so revert them for now.

Conflicts:

	fs/fs-writeback.c
	mm/page-writeback.c

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 11 insertions, 37 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 6753912641b4..408a7877b79d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -45,7 +45,6 @@ struct wb_writeback_args {
         unsigned int for_kupdate:1;
         unsigned int range_cyclic:1;
         unsigned int for_background:1;
-        unsigned int sb_pinned:1;
 };
 
 /*
@@ -231,11 +230,6 @@ static void bdi_sync_writeback(struct backing_dev_info *bdi,
                 .sync_mode      = WB_SYNC_ALL,
                 .nr_pages       = LONG_MAX,
                 .range_cyclic   = 0,
-                /*
-                 * Setting sb_pinned is not necessary for WB_SYNC_ALL, but
-                 * lets make it explicitly clear.
-                 */
-                .sb_pinned      = 1,
         };
         struct bdi_work work;
 
@@ -251,23 +245,21 @@ static void bdi_sync_writeback(struct backing_dev_info *bdi,
  * @bdi: the backing device to write from
  * @sb: write inodes from this super_block
  * @nr_pages: the number of pages to write
- * @sb_locked: caller already holds sb umount sem.
  *
  * Description:
  *   This does WB_SYNC_NONE opportunistic writeback. The IO is only
  *   started when this function returns, we make no guarentees on
- *   completion. Caller specifies whether sb umount sem is held already or not.
+ *   completion. Caller need not hold sb s_umount semaphore.
  *
  */
 void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
-                         long nr_pages, int sb_locked)
+                         long nr_pages)
 {
         struct wb_writeback_args args = {
                 .sb             = sb,
                 .sync_mode      = WB_SYNC_NONE,
                 .nr_pages       = nr_pages,
                 .range_cyclic   = 1,
-                .sb_pinned      = sb_locked,
         };
 
         /*
@@ -592,7 +584,7 @@ static enum sb_pin_state pin_sb_for_writeback(struct writeback_control *wbc,
         /*
          * Caller must already hold the ref for this
          */
-        if (wbc->sync_mode == WB_SYNC_ALL || wbc->sb_pinned) {
+        if (wbc->sync_mode == WB_SYNC_ALL) {
                 WARN_ON(!rwsem_is_locked(&sb->s_umount));
                 return SB_NOT_PINNED;
         }
@@ -766,7 +758,6 @@ static long wb_writeback(struct bdi_writeback *wb,
                 .for_kupdate            = args->for_kupdate,
                 .for_background         = args->for_background,
                 .range_cyclic           = args->range_cyclic,
-                .sb_pinned              = args->sb_pinned,
         };
         unsigned long oldest_jif;
         long wrote = 0;
@@ -1214,18 +1205,6 @@ static void wait_sb_inodes(struct super_block *sb)
         iput(old_inode);
 }
 
-static void __writeback_inodes_sb(struct super_block *sb, int sb_locked)
-{
-        unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
-        unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
-        long nr_to_write;
-
-        nr_to_write = nr_dirty + nr_unstable +
-                        (inodes_stat.nr_inodes - inodes_stat.nr_unused);
-
-        bdi_start_writeback(sb->s_bdi, sb, nr_to_write, sb_locked);
-}
-
 /**
  * writeback_inodes_sb  -       writeback dirty inodes from given super_block
  * @sb: the superblock
@@ -1237,21 +1216,16 @@ static void __writeback_inodes_sb(struct super_block *sb, int sb_locked)
  */
 void writeback_inodes_sb(struct super_block *sb)
 {
-        __writeback_inodes_sb(sb, 0);
-}
-EXPORT_SYMBOL(writeback_inodes_sb);
+        unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
+        unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
+        long nr_to_write;
 
-/**
- * writeback_inodes_sb_locked   - writeback dirty inodes from given super_block
- * @sb: the superblock
- *
- * Like writeback_inodes_sb(), except the caller already holds the
- * sb umount sem.
- */
-void writeback_inodes_sb_locked(struct super_block *sb)
-{
-        __writeback_inodes_sb(sb, 1);
+        nr_to_write = nr_dirty + nr_unstable +
+                        (inodes_stat.nr_inodes - inodes_stat.nr_unused);
+
+        bdi_start_writeback(sb->s_bdi, sb, nr_to_write);
 }
+EXPORT_SYMBOL(writeback_inodes_sb);
 
 /**
  * writeback_inodes_sb_if_idle  -       start writeback if none underway