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Btrfs: fs_info variable for join_transaction 

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt 2012-05-20 15:42:19 +02:00
parent 8445f61cad
commit 19ae4e8133
1 changed files with 19 additions and 18 deletions
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37
fs/btrfs/transaction.c
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@ -55,48 +55,49 @@ static noinline void switch_commit_root(struct btrfs_root *root)
static noinline int join_transaction(struct btrfs_root *root, int nofail)
{
struct btrfs_transaction *cur_trans;
struct btrfs_fs_info *fs_info = root->fs_info;
spin_lock(&root->fs_info->trans_lock);
spin_lock(&fs_info->trans_lock);
loop:
/* The file system has been taken offline. No new transactions. */
if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
spin_unlock(&root->fs_info->trans_lock);
if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
spin_unlock(&fs_info->trans_lock);
return -EROFS;
}
if (root->fs_info->trans_no_join) {
if (fs_info->trans_no_join) {
if (!nofail) {
spin_unlock(&root->fs_info->trans_lock);
spin_unlock(&fs_info->trans_lock);
return -EBUSY;
}
}
cur_trans = root->fs_info->running_transaction;
cur_trans = fs_info->running_transaction;
if (cur_trans) {
if (cur_trans->aborted) {
spin_unlock(&root->fs_info->trans_lock);
spin_unlock(&fs_info->trans_lock);
return cur_trans->aborted;
}
atomic_inc(&cur_trans->use_count);
atomic_inc(&cur_trans->num_writers);
cur_trans->num_joined++;
spin_unlock(&root->fs_info->trans_lock);
spin_unlock(&fs_info->trans_lock);
return 0;
}
spin_unlock(&root->fs_info->trans_lock);
spin_unlock(&fs_info->trans_lock);
cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS);
if (!cur_trans)
return -ENOMEM;
spin_lock(&root->fs_info->trans_lock);
if (root->fs_info->running_transaction) {
spin_lock(&fs_info->trans_lock);
if (fs_info->running_transaction) {
/*
* someone started a transaction after we unlocked. Make sure
* to redo the trans_no_join checks above
*/
kmem_cache_free(btrfs_transaction_cachep, cur_trans);
cur_trans = root->fs_info->running_transaction;
cur_trans = fs_info->running_transaction;
goto loop;
}
@ -127,14 +128,14 @@ loop:
INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head);
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
list_add_tail(&cur_trans->list, &fs_info->trans_list);
extent_io_tree_init(&cur_trans->dirty_pages,
root->fs_info->btree_inode->i_mapping);
root->fs_info->generation++;
cur_trans->transid = root->fs_info->generation;
root->fs_info->running_transaction = cur_trans;
fs_info->btree_inode->i_mapping);
fs_info->generation++;
cur_trans->transid = fs_info->generation;
fs_info->running_transaction = cur_trans;
cur_trans->aborted = 0;
spin_unlock(&root->fs_info->trans_lock);
spin_unlock(&fs_info->trans_lock);
return 0;
}