Btrfs: Transaction commit: don't use filemap_fdatawait

After writing out all the remaining btree blocks in the transaction,
the commit code would use filemap_fdatawait to make sure it was all
on disk.  This means it would wait for blocks written by other procs
as well.

The new code walks the list of blocks for this transaction again
and waits only for those required by this transaction.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9902d29abd06..9601b13c7d7a 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -429,7 +429,7 @@ int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
         return 0;
 }
 
-static int congested_async(struct btrfs_fs_info *info, int iodone)
+int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
 {
         int limit = 256 * info->fs_devices->open_devices;
 
@@ -438,9 +438,6 @@ static int congested_async(struct btrfs_fs_info *info, int iodone)
         if (atomic_read(&info->nr_async_submits) > limit)
                 return 1;
 
-        limit = 8192 * info->fs_devices->open_devices;
-        if (iodone)
-                limit = (limit * 3) / 2;
         return atomic_read(&info->nr_async_bios) > limit;
 }
 
@@ -454,7 +451,7 @@ static void run_one_async_submit(struct btrfs_work *work)
         atomic_dec(&fs_info->nr_async_submits);
 
         if ((async->bio->bi_rw & (1 << BIO_RW)) &&
-            !congested_async(fs_info, 1)) {
+            !btrfs_congested_async(fs_info, 1)) {
                 clear_bdi_congested(&fs_info->bdi, WRITE);
         }
         async->submit_bio_hook(async->inode, async->rw, async->bio,
@@ -963,7 +960,7 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
         struct backing_dev_info *bdi;
 
         if ((bdi_bits & (1 << BDI_write_congested)) &&
-            congested_async(info, 0))
+            btrfs_congested_async(info, 0))
                 return 1;
 
         list_for_each(cur, &info->fs_devices->devices) {
@@ -1844,7 +1841,7 @@ void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
         struct extent_io_tree *tree;
         u64 num_dirty;
         u64 start = 0;
-        unsigned long thresh = 16 * 1024 * 1024;
+        unsigned long thresh = 2 * 1024 * 1024;
         tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
 
         if (current_is_pdflush())