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authorYan, Zheng <zheng.yan@oracle.com>2010-05-16 10:49:58 -0400
committerChris Mason <chris.mason@oracle.com>2010-05-25 10:34:52 -0400
commitd68fc57b7e3245cfacf2e3b47acfed1946a11786 (patch)
treec2572fcd935017440c8370c8a12ceb49a7fc4f1f /fs/btrfs/extent-tree.c
parent8929ecfa50f266163832eeacfbc3642ed5eb83b6 (diff)
Btrfs: Metadata reservation for orphan inodes
reserve metadata space for handling orphan inodes Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
-rw-r--r--fs/btrfs/extent-tree.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index cb814a71800..a713f69f0c7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3626,6 +3626,34 @@ void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
trans->bytes_reserved = 0;
}
+int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
+ struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root);
+ struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv;
+
+ /*
+ * one for deleting orphan item, one for updating inode and
+ * two for calling btrfs_truncate_inode_items.
+ *
+ * btrfs_truncate_inode_items is a delete operation, it frees
+ * more space than it uses in most cases. So two units of
+ * metadata space should be enough for calling it many times.
+ * If all of the metadata space is used, we can commit
+ * transaction and use space it freed.
+ */
+ u64 num_bytes = calc_trans_metadata_size(root, 4);
+ return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes);
+}
+
+void btrfs_orphan_release_metadata(struct inode *inode)
+{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ u64 num_bytes = calc_trans_metadata_size(root, 4);
+ btrfs_block_rsv_release(root, root->orphan_block_rsv, num_bytes);
+}
+
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending)
{