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Btrfs: Fix race in running_transaction checks

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When a new transaction was started, the code would incorrectly
set the pointer in fs_info before all the data structures were setup.
fsync heavy workloads hit races on the setup of the ordered inode spinlock

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-06-09 09:35:50 -04:00
parent e1b81e6761
commit 48ec2cf873
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/transaction.c
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@ -56,7 +56,6 @@ static noinline int join_transaction(struct btrfs_root *root)
total_trans++;
BUG_ON(!cur_trans);
root->fs_info->generation++;
root->fs_info->running_transaction = cur_trans;
root->fs_info->last_alloc = 0;
root->fs_info->last_data_alloc = 0;
cur_trans->num_writers = 1;
@ -74,6 +73,9 @@ static noinline int join_transaction(struct btrfs_root *root)
extent_io_tree_init(&cur_trans->dirty_pages,
root->fs_info->btree_inode->i_mapping,
GFP_NOFS);
spin_lock(&root->fs_info->new_trans_lock);
root->fs_info->running_transaction = cur_trans;
spin_unlock(&root->fs_info->new_trans_lock);
} else {
cur_trans->num_writers++;
cur_trans->num_joined++;