Btrfs: Integrate metadata reservation with start_transaction
Besides simplify the code, this change makes sure all metadata
reservation for normal metadata operations are released after
committing transaction.
Changes since V1:
Add code that check if unlink and rmdir will free space.
Add ENOSPC handling for clone ioctl.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 8db7b14..d6e3af8 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1097,7 +1097,7 @@
if (!path)
return -ENOMEM;
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = device->devid;
@@ -1486,7 +1486,7 @@
goto error;
}
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
lock_chunks(root);
device->barriers = 1;
@@ -1751,9 +1751,10 @@
/* step one, relocate all the extents inside this chunk */
ret = btrfs_relocate_block_group(extent_root, chunk_offset);
- BUG_ON(ret);
+ if (ret)
+ return ret;
- trans = btrfs_start_transaction(root, 1);
+ trans = btrfs_start_transaction(root, 0);
BUG_ON(!trans);
lock_chunks(root);
@@ -1925,7 +1926,7 @@
break;
BUG_ON(ret);
- trans = btrfs_start_transaction(dev_root, 1);
+ trans = btrfs_start_transaction(dev_root, 0);
BUG_ON(!trans);
ret = btrfs_grow_device(trans, device, old_size);
@@ -2094,11 +2095,7 @@
}
/* Shrinking succeeded, else we would be at "done". */
- trans = btrfs_start_transaction(root, 1);
- if (!trans) {
- ret = -ENOMEM;
- goto done;
- }
+ trans = btrfs_start_transaction(root, 0);
lock_chunks(root);
device->disk_total_bytes = new_size;