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Btrfs: Add a leaf reference cache

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Much of the IO done while dropping snapshots is done looking up
leaves in the filesystem trees to see if they point to any extents and
to drop the references on any extents found.

This creates a cache so that IO isn't required.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan Zheng
2008-07-28 15:32:19 -04:00
committed by Chris Mason
parent 3a115f520f
commit 31153d8128
8 changed files with 476 additions and 33 deletions
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14
fs/btrfs/disk-io.c
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@@ -716,6 +716,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
root->node = NULL;
root->inode = NULL;
root->commit_root = NULL;
root->ref_tree = NULL;
root->sectorsize = sectorsize;
root->nodesize = nodesize;
root->leafsize = leafsize;
@@ -1165,12 +1166,19 @@ static int transaction_kthread(void *arg)
vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
mutex_lock(&root->fs_info->transaction_kthread_mutex);
printk("btrfs: total reference cache size %Lu\n",
root->fs_info->total_ref_cache_size);
mutex_lock(&root->fs_info->trans_mutex);
cur = root->fs_info->running_transaction;
if (!cur) {
mutex_unlock(&root->fs_info->trans_mutex);
goto sleep;
}
printk("btrfs: running reference cache size %Lu\n",
root->fs_info->running_ref_cache_size);
now = get_seconds();
if (now < cur->start_time || now - cur->start_time < 30) {
mutex_unlock(&root->fs_info->trans_mutex);
@@ -1233,6 +1241,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
spin_lock_init(&fs_info->hash_lock);
spin_lock_init(&fs_info->delalloc_lock);
spin_lock_init(&fs_info->new_trans_lock);
spin_lock_init(&fs_info->ref_cache_lock);
init_completion(&fs_info->kobj_unregister);
fs_info->tree_root = tree_root;
@@ -1699,6 +1708,11 @@ int close_ctree(struct btrfs_root *root)
printk("btrfs: at unmount delalloc count %Lu\n",
fs_info->delalloc_bytes);
}
if (fs_info->total_ref_cache_size) {
printk("btrfs: at umount reference cache size %Lu\n",
fs_info->total_ref_cache_size);
}
if (fs_info->extent_root->node)
free_extent_buffer(fs_info->extent_root->node);