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authorSage Weil <sage@newdream.net>2010-10-29 15:37:34 -0400
committerChris Mason <chris.mason@oracle.com>2010-10-29 15:37:34 -0400
commitbb9c12c945cbd1b0eaa1589546dde772ccabeeba (patch)
tree92f0bb01dce5125547c590d7c06b3e02d5c9d4fa /fs/btrfs/transaction.c
parent99d16cbcaf694c803a1b6bf7e851694ffe1d255d (diff)
Btrfs: async transaction commit
Add support for an async transaction commit that is ordered such that any subsequent operations will join the following transaction, but does not wait until the current commit is fully on disk. This avoids much of the latency associated with the btrfs_commit_transaction for callers concerned with serialization and not safety. The wait_for_unblock flag controls whether we wait for the 'middle' portion of commit_transaction to complete, which is necessary if the caller expects some of the modifications contained in the commit to be available (this is the case for subvol/snapshot creation). Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 700dc4b34ada..9f40bfc9c45c 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1007,6 +1007,123 @@ int btrfs_transaction_blocked(struct btrfs_fs_info *info)
return ret;
}
+/*
+ * wait for the current transaction commit to start and block subsequent
+ * transaction joins
+ */
+static void wait_current_trans_commit_start(struct btrfs_root *root,
+ struct btrfs_transaction *trans)
+{
+ DEFINE_WAIT(wait);
+
+ if (trans->in_commit)
+ return;
+
+ while (1) {
+ prepare_to_wait(&root->fs_info->transaction_blocked_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (trans->in_commit) {
+ finish_wait(&root->fs_info->transaction_blocked_wait,
+ &wait);
+ break;
+ }
+ mutex_unlock(&root->fs_info->trans_mutex);
+ schedule();
+ mutex_lock(&root->fs_info->trans_mutex);
+ finish_wait(&root->fs_info->transaction_blocked_wait, &wait);
+ }
+}
+
+/*
+ * wait for the current transaction to start and then become unblocked.
+ * caller holds ref.
+ */
+static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root,
+ struct btrfs_transaction *trans)
+{
+ DEFINE_WAIT(wait);
+
+ if (trans->commit_done || (trans->in_commit && !trans->blocked))
+ return;
+
+ while (1) {
+ prepare_to_wait(&root->fs_info->transaction_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (trans->commit_done ||
+ (trans->in_commit && !trans->blocked)) {
+ finish_wait(&root->fs_info->transaction_wait,
+ &wait);
+ break;
+ }
+ mutex_unlock(&root->fs_info->trans_mutex);
+ schedule();
+ mutex_lock(&root->fs_info->trans_mutex);
+ finish_wait(&root->fs_info->transaction_wait,
+ &wait);
+ }
+}
+
+/*
+ * commit transactions asynchronously. once btrfs_commit_transaction_async
+ * returns, any subsequent transaction will not be allowed to join.
+ */
+struct btrfs_async_commit {
+ struct btrfs_trans_handle *newtrans;
+ struct btrfs_root *root;
+ struct delayed_work work;
+};
+
+static void do_async_commit(struct work_struct *work)
+{
+ struct btrfs_async_commit *ac =
+ container_of(work, struct btrfs_async_commit, work.work);
+
+ btrfs_commit_transaction(ac->newtrans, ac->root);
+ kfree(ac);
+}
+
+int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ int wait_for_unblock)
+{
+ struct btrfs_async_commit *ac;
+ struct btrfs_transaction *cur_trans;
+
+ ac = kmalloc(sizeof(*ac), GFP_NOFS);
+ BUG_ON(!ac);
+
+ INIT_DELAYED_WORK(&ac->work, do_async_commit);
+ ac->root = root;
+ ac->newtrans = btrfs_join_transaction(root, 0);
+
+ /* take transaction reference */
+ mutex_lock(&root->fs_info->trans_mutex);
+ cur_trans = trans->transaction;
+ cur_trans->use_count++;
+ mutex_unlock(&root->fs_info->trans_mutex);
+
+ btrfs_end_transaction(trans, root);
+ schedule_delayed_work(&ac->work, 0);
+
+ /* wait for transaction to start and unblock */
+ mutex_lock(&root->fs_info->trans_mutex);
+ if (wait_for_unblock)
+ wait_current_trans_commit_start_and_unblock(root, cur_trans);
+ else
+ wait_current_trans_commit_start(root, cur_trans);
+ put_transaction(cur_trans);
+ mutex_unlock(&root->fs_info->trans_mutex);
+
+ return 0;
+}
+
+/*
+ * btrfs_transaction state sequence:
+ * in_commit = 0, blocked = 0 (initial)
+ * in_commit = 1, blocked = 1
+ * blocked = 0
+ * commit_done = 1
+ */
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
@@ -1057,6 +1174,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
trans->transaction->in_commit = 1;
trans->transaction->blocked = 1;
+ wake_up(&root->fs_info->transaction_blocked_wait);
+
if (cur_trans->list.prev != &root->fs_info->trans_list) {
prev_trans = list_entry(cur_trans->list.prev,
struct btrfs_transaction, list);