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Btrfs: be more polite in the async caching threads 

The semaphore used by the async caching threads can prevent a
transaction commit, which can make the FS appear to stall.  This
releases the semaphore more often when a transaction commit is
in progress.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-07-30 10:04:48 -04:00
parent 276e680d19
commit f36f3042ea
3 changed files with 14 additions and 2 deletions
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5
fs/btrfs/extent-tree.c
View File

@ -302,10 +302,11 @@ static int caching_kthread(void *data)
else if (ret)
break;
if (need_resched()) {
if (need_resched() ||
btrfs_transaction_in_commit(fs_info)) {
btrfs_release_path(fs_info->extent_root, path);
up_read(&fs_info->extent_commit_sem);
cond_resched();
schedule_timeout(1);
goto again;
}

10
fs/btrfs/transaction.c
View File

@ -857,6 +857,16 @@ static void update_super_roots(struct btrfs_root *root)
super->root_level = root_item->level;
}
int btrfs_transaction_in_commit(struct btrfs_fs_info *info)
{
int ret = 0;
spin_lock(&info->new_trans_lock);
if (info->running_transaction)
ret = info->running_transaction->in_commit;
spin_unlock(&info->new_trans_lock);
return ret;
}
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{

1
fs/btrfs/transaction.h
View File

@ -107,4 +107,5 @@ int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
struct extent_io_tree *dirty_pages);
int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
#endif