Btrfs: still corruption hunting
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 84c4e27..72b52e1 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -5,13 +5,20 @@
#include "transaction.h"
static int total_trans = 0;
+extern struct kmem_cache *btrfs_trans_handle_cachep;
+extern struct kmem_cache *btrfs_transaction_cachep;
+
+#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--;
- kfree(transaction);
+ memset(transaction, 0, sizeof(*transaction));
+ kmem_cache_free(btrfs_transaction_cachep, transaction);
}
}
@@ -20,7 +27,8 @@
struct btrfs_transaction *cur_trans;
cur_trans = root->fs_info->running_transaction;
if (!cur_trans) {
- cur_trans = kmalloc(sizeof(*cur_trans), GFP_NOFS);
+ cur_trans = kmem_cache_alloc(btrfs_transaction_cachep,
+ GFP_NOFS);
total_trans++;
BUG_ON(!cur_trans);
root->fs_info->running_transaction = cur_trans;
@@ -28,6 +36,7 @@
cur_trans->transid = root->root_key.offset + 1;
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;
@@ -39,7 +48,8 @@
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
int num_blocks)
{
- struct btrfs_trans_handle *h = kmalloc(sizeof(*h), GFP_NOFS);
+ struct btrfs_trans_handle *h =
+ kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
int ret;
mutex_lock(&root->fs_info->trans_mutex);
@@ -51,6 +61,7 @@
h->blocks_used = 0;
root->fs_info->running_transaction->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
+ h->magic = h->magic2 = TRANS_MAGIC;
return h;
}
@@ -58,6 +69,8 @@
struct btrfs_root *root)
{
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);
@@ -67,7 +80,7 @@
put_transaction(cur_trans);
mutex_unlock(&root->fs_info->trans_mutex);
memset(trans, 0, sizeof(*trans));
- kfree(trans);
+ kmem_cache_free(btrfs_trans_handle_cachep, trans);
return 0;
}
@@ -75,7 +88,7 @@
int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- filemap_write_and_wait(root->fs_info->btree_inode->i_mapping);
+ filemap_write_and_wait(root->fs_info->sb->s_bdev->bd_inode->i_mapping);
return 0;
}
@@ -137,6 +150,7 @@
mutex_lock(&root->fs_info->trans_mutex);
if (trans->transaction->in_commit) {
+printk("already in commit!, waiting\n");
cur_trans = trans->transaction;
trans->transaction->use_count++;
btrfs_end_transaction(trans, root);
@@ -146,7 +160,10 @@
mutex_unlock(&root->fs_info->trans_mutex);
return 0;
}
+ cur_trans = trans->transaction;
+ trans->transaction->in_commit = 1;
while (trans->transaction->num_writers > 1) {
+ WARN_ON(cur_trans != trans->transaction);
prepare_to_wait(&trans->transaction->writer_wait, &wait,
TASK_UNINTERRUPTIBLE);
if (trans->transaction->num_writers <= 1)
@@ -154,15 +171,15 @@
mutex_unlock(&root->fs_info->trans_mutex);
schedule();
mutex_lock(&root->fs_info->trans_mutex);
+ finish_wait(&trans->transaction->writer_wait, &wait);
}
finish_wait(&trans->transaction->writer_wait, &wait);
-
+ WARN_ON(cur_trans != trans->transaction);
if (root->node != root->commit_root) {
memcpy(&snap_key, &root->root_key, sizeof(snap_key));
root->root_key.offset++;
}
-
if (btrfs_root_blocknr(&root->root_item) != root->node->b_blocknr) {
btrfs_set_root_blocknr(&root->root_item, root->node->b_blocknr);
ret = btrfs_insert_root(trans, root->fs_info->tree_root,
@@ -172,22 +189,21 @@
ret = btrfs_commit_tree_roots(trans, root);
BUG_ON(ret);
-
cur_trans = root->fs_info->running_transaction;
root->fs_info->running_transaction = NULL;
mutex_unlock(&root->fs_info->trans_mutex);
-
ret = btrfs_write_and_wait_transaction(trans, root);
BUG_ON(ret);
write_ctree_super(trans, root);
btrfs_finish_extent_commit(trans, root);
mutex_lock(&root->fs_info->trans_mutex);
+ cur_trans->commit_done = 1;
+ wake_up(&cur_trans->commit_wait);
put_transaction(cur_trans);
put_transaction(cur_trans);
mutex_unlock(&root->fs_info->trans_mutex);
- kfree(trans);
-
+ kmem_cache_free(btrfs_trans_handle_cachep, trans);
if (root->node != root->commit_root) {
trans = btrfs_start_transaction(root, 1);
snap = root->commit_root;
@@ -203,7 +219,6 @@
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
}
-
return ret;
}