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authorChris Mason <chris.mason@oracle.com>2008-07-17 12:54:14 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:04 -0400
commitf9295749388f82c8d2f485e99c72cd7c7876a99b (patch)
tree5089b0f723583d262116775b8b9fb5b4b8d291e0 /fs/btrfs/transaction.c
parentdbe674a99c8af088faa4c95eddaeb271a3140ab6 (diff)
btrfs_start_transaction: wait for commits in progress to finish
btrfs_commit_transaction has to loop waiting for any writers in the transaction to finish before it can proceed. btrfs_start_transaction should be polite and not join a transaction that is in the process of being finished off. There are a few places that can't wait, basically the ones doing IO that might be needed to finish the transaction. For them, btrfs_join_transaction is added. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c43
1 files changed, 40 insertions, 3 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 86a5acc19ce..05823904ecb 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -62,6 +62,7 @@ static noinline int join_transaction(struct btrfs_root *root)
init_waitqueue_head(&cur_trans->writer_wait);
init_waitqueue_head(&cur_trans->commit_wait);
cur_trans->in_commit = 0;
+ cur_trans->blocked = 0;
cur_trans->use_count = 1;
cur_trans->commit_done = 0;
cur_trans->start_time = get_seconds();
@@ -99,14 +100,36 @@ static noinline int record_root_in_trans(struct btrfs_root *root)
return 0;
}
-struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
- int num_blocks)
+struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
+ int num_blocks, int join)
{
struct btrfs_trans_handle *h =
kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
+ struct btrfs_transaction *cur_trans;
int ret;
mutex_lock(&root->fs_info->trans_mutex);
+ cur_trans = root->fs_info->running_transaction;
+ if (cur_trans && cur_trans->blocked && !join) {
+ DEFINE_WAIT(wait);
+ cur_trans->use_count++;
+ while(1) {
+ prepare_to_wait(&root->fs_info->transaction_wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (cur_trans->blocked) {
+ mutex_unlock(&root->fs_info->trans_mutex);
+ schedule();
+ mutex_lock(&root->fs_info->trans_mutex);
+ finish_wait(&root->fs_info->transaction_wait,
+ &wait);
+ } else {
+ finish_wait(&root->fs_info->transaction_wait,
+ &wait);
+ break;
+ }
+ }
+ put_transaction(cur_trans);
+ }
ret = join_transaction(root);
BUG_ON(ret);
@@ -123,6 +146,17 @@ struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
return h;
}
+struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
+ int num_blocks)
+{
+ return start_transaction(root, num_blocks, 0);
+}
+struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
+ int num_blocks)
+{
+ return start_transaction(root, num_blocks, 1);
+}
+
static noinline int wait_for_commit(struct btrfs_root *root,
struct btrfs_transaction *commit)
{
@@ -156,7 +190,7 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
if (waitqueue_active(&cur_trans->writer_wait))
wake_up(&cur_trans->writer_wait);
- if (cur_trans->in_commit && throttle) {
+ if (0 && cur_trans->in_commit && throttle) {
DEFINE_WAIT(wait);
mutex_unlock(&root->fs_info->trans_mutex);
prepare_to_wait(&root->fs_info->transaction_throttle, &wait,
@@ -617,6 +651,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
printk("commit trans %Lu\n", trans->transid);
trans->transaction->in_commit = 1;
+ trans->transaction->blocked = 1;
cur_trans = trans->transaction;
if (cur_trans->list.prev != &root->fs_info->trans_list) {
prev_trans = list_entry(cur_trans->list.prev,
@@ -684,7 +719,9 @@ printk("commit trans %Lu\n", trans->transid);
btrfs_copy_pinned(root, pinned_copy);
+ trans->transaction->blocked = 0;
wake_up(&root->fs_info->transaction_throttle);
+ wake_up(&root->fs_info->transaction_wait);
mutex_unlock(&root->fs_info->trans_mutex);
ret = btrfs_write_and_wait_transaction(trans, root);