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authorChris Mason <chris.mason@oracle.com>2009-07-30 10:04:48 -0400
committerChris Mason <chris.mason@oracle.com>2009-07-30 10:14:46 -0400
commitf36f3042eae238bdaefe7c79310afe573bfc3622 (patch)
tree83ea0e271dedeef36423509be7f4189b838d14b5
parent276e680d192a67d222fcea51af37b056feffb665 (diff)
Btrfs: be more polite in the async caching threads
The semaphore used by the async caching threads can prevent a transaction commit, which can make the FS appear to stall. This releases the semaphore more often when a transaction commit is in progress. Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/extent-tree.c5
-rw-r--r--fs/btrfs/transaction.c10
-rw-r--r--fs/btrfs/transaction.h1
3 files changed, 14 insertions, 2 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2fe21fa74913..dc84daee6bc4 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -302,10 +302,11 @@ again:
else if (ret)
break;
- if (need_resched()) {
+ if (need_resched() ||
+ btrfs_transaction_in_commit(fs_info)) {
btrfs_release_path(fs_info->extent_root, path);
up_read(&fs_info->extent_commit_sem);
- cond_resched();
+ schedule_timeout(1);
goto again;
}
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index de48e4ec808c..cdbb5022da52 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -857,6 +857,16 @@ static void update_super_roots(struct btrfs_root *root)
super->root_level = root_item->level;
}
+int btrfs_transaction_in_commit(struct btrfs_fs_info *info)
+{
+ int ret = 0;
+ spin_lock(&info->new_trans_lock);
+ if (info->running_transaction)
+ ret = info->running_transaction->in_commit;
+ spin_unlock(&info->new_trans_lock);
+ return ret;
+}
+
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 961c3ee5a2e1..663c67404918 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -107,4 +107,5 @@ int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
struct extent_io_tree *dirty_pages);
+int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
#endif