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Btrfs: get forced transaction commits via workqueue 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-06-08 18:11:48 -04:00 committed by David Woodhouse
parent 08607c1b18
commit facda1e787
4 changed files with 27 additions and 14 deletions
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4
fs/btrfs/ctree.h
View File

@ -283,6 +283,7 @@ struct btrfs_block_group_cache {
struct crypto_hash;
struct btrfs_fs_info {
spinlock_t hash_lock;
struct btrfs_root *extent_root;
struct btrfs_root *tree_root;
struct btrfs_root *dev_root;
@ -308,10 +309,11 @@ struct btrfs_fs_info {
struct mutex trans_mutex;
struct mutex fs_mutex;
struct list_head trans_list;
struct list_head dead_roots;
struct crypto_hash *hash_tfm;
struct delayed_work trans_work;
spinlock_t hash_lock;
int do_barriers;
int closing;
};
/*

4
fs/btrfs/disk-io.c
View File

@ -563,6 +563,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
INIT_RADIX_TREE(&fs_info->block_group_radix, GFP_KERNEL);
INIT_RADIX_TREE(&fs_info->block_group_data_radix, GFP_KERNEL);
INIT_LIST_HEAD(&fs_info->trans_list);
INIT_LIST_HEAD(&fs_info->dead_roots);
sb_set_blocksize(sb, 4096);
fs_info->running_transaction = NULL;
fs_info->tree_root = tree_root;
@ -577,6 +578,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
fs_info->do_barriers = 1;
fs_info->extent_tree_insert_nr = 0;
fs_info->extent_tree_prealloc_nr = 0;
fs_info->closing = 0;
INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
BTRFS_I(fs_info->btree_inode)->root = tree_root;
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
@ -746,6 +749,7 @@ int close_ctree(struct btrfs_root *root)
struct btrfs_trans_handle *trans;
struct btrfs_fs_info *fs_info = root->fs_info;
fs_info->closing = 1;
btrfs_transaction_flush_work(root);
mutex_lock(&fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);

30
fs/btrfs/transaction.c
View File

@ -12,12 +12,10 @@ static struct workqueue_struct *trans_wq;
#define BTRFS_ROOT_TRANS_TAG 0
#define TRANS_MAGIC 0xE1E10E
static void put_transaction(struct btrfs_transaction *transaction)
{
WARN_ON(transaction->use_count == 0);
transaction->use_count--;
WARN_ON(transaction->magic != TRANS_MAGIC);
if (transaction->use_count == 0) {
WARN_ON(total_trans == 0);
total_trans--;
@ -42,7 +40,6 @@ static int join_transaction(struct btrfs_root *root)
cur_trans->transid = root->fs_info->generation;
init_waitqueue_head(&cur_trans->writer_wait);
init_waitqueue_head(&cur_trans->commit_wait);
cur_trans->magic = TRANS_MAGIC;
cur_trans->in_commit = 0;
cur_trans->use_count = 1;
cur_trans->commit_done = 0;
@ -83,7 +80,6 @@ struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
h->block_group = NULL;
root->fs_info->running_transaction->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
h->magic = h->magic2 = TRANS_MAGIC;
return h;
}
@ -92,8 +88,6 @@ int btrfs_end_transaction(struct btrfs_trans_handle *trans,
{
struct btrfs_transaction *cur_trans;
WARN_ON(trans->magic != TRANS_MAGIC);
WARN_ON(trans->magic2 != TRANS_MAGIC);
mutex_lock(&root->fs_info->trans_mutex);
cur_trans = root->fs_info->running_transaction;
WARN_ON(cur_trans->num_writers < 1);
@ -257,8 +251,8 @@ static int drop_dirty_roots(struct btrfs_root *tree_root,
struct dirty_root *dirty;
struct btrfs_trans_handle *trans;
int ret;
while(!list_empty(list)) {
mutex_lock(&tree_root->fs_info->fs_mutex);
dirty = list_entry(list->next, struct dirty_root, list);
list_del_init(&dirty->list);
trans = btrfs_start_transaction(tree_root, 1);
@ -271,6 +265,7 @@ static int drop_dirty_roots(struct btrfs_root *tree_root,
ret = btrfs_end_transaction(trans, tree_root);
BUG_ON(ret);
kfree(dirty);
mutex_unlock(&tree_root->fs_info->fs_mutex);
}
return 0;
}
@ -346,10 +341,18 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
wake_up(&cur_trans->commit_wait);
put_transaction(cur_trans);
put_transaction(cur_trans);
if (root->fs_info->closing)
list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots);
else
list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots);
mutex_unlock(&root->fs_info->trans_mutex);
kmem_cache_free(btrfs_trans_handle_cachep, trans);
drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots);
if (root->fs_info->closing) {
mutex_unlock(&root->fs_info->fs_mutex);
drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots);
mutex_lock(&root->fs_info->fs_mutex);
}
return ret;
}
@ -362,11 +365,19 @@ void btrfs_transaction_cleaner(struct work_struct *work)
struct btrfs_root *root = fs_info->tree_root;
struct btrfs_transaction *cur;
struct btrfs_trans_handle *trans;
struct list_head dirty_roots;
unsigned long now;
unsigned long delay = HZ * 30;
int ret;
printk("btrfs transaction cleaner\n");
INIT_LIST_HEAD(&dirty_roots);
mutex_lock(&root->fs_info->trans_mutex);
list_splice_init(&root->fs_info->dead_roots, &dirty_roots);
mutex_unlock(&root->fs_info->trans_mutex);
if (!list_empty(&dirty_roots)) {
drop_dirty_roots(root, &dirty_roots);
}
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->trans_mutex);
cur = root->fs_info->running_transaction;
@ -381,7 +392,6 @@ printk("btrfs transaction cleaner\n");
goto out;
}
mutex_unlock(&root->fs_info->trans_mutex);
printk("forcing commit\n");
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
out:

3
fs/btrfs/transaction.h
View File

@ -8,7 +8,6 @@ struct btrfs_transaction {
int in_commit;
int use_count;
int commit_done;
int magic;
struct list_head list;
struct radix_tree_root dirty_pages;
unsigned long start_time;
@ -17,13 +16,11 @@ struct btrfs_transaction {
};
struct btrfs_trans_handle {
int magic;
u64 transid;
unsigned long blocks_reserved;
unsigned long blocks_used;
struct btrfs_transaction *transaction;
struct btrfs_block_group_cache *block_group;
int magic2;
};