We have btrfs_alloc_dev_extent() accepting @convert flag to toggle
special handling for convert.
However that @convert flag only determine whether we call
find_free_dev_extent(), and we may later need to insert dev extents
without searching dev tree.
So refactor btrfs_alloc_dev_extent() into 2 functions,
btrfs_alloc_dev_extent(), which will try to find free dev extent, and
btrfs_insert_dev_extent(), which will just insert a dev extent.
For implementation, btrfs_alloc_dev_extent() will call
btrfs_insert_dev_extent() anyway, so no duplicated code.
This removes the need of @convert parameter, and make
btrfs_insert_dev_extent() public for later usage.
Signed-off-by: Qu Wenruo <w...@suse.com>
---
volumes.c | 48 ++++++++++++++++++++++++++++++------------------
volumes.h | 3 +++
2 files changed, 33 insertions(+), 18 deletions(-)
diff --git a/volumes.c b/volumes.c
index 30090ce5f8e8..0dd082cd1718 100644
--- a/volumes.c
+++ b/volumes.c
@@ -530,10 +530,12 @@ static int find_free_dev_extent(struct btrfs_device
*device, u64 num_bytes,
return find_free_dev_extent_start(device, num_bytes, 0, start, len);
}
-static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
- struct btrfs_device *device,
- u64 chunk_offset, u64 num_bytes, u64 *start,
- int convert)
+/*
+ * Insert one device extent into the fs.
+ */
+int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_device *device,
+ u64 chunk_offset, u64 num_bytes, u64 start)
{
int ret;
struct btrfs_path *path;
@@ -546,18 +548,8 @@ static int btrfs_alloc_dev_extent(struct
btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
- /*
- * For convert case, just skip search free dev_extent, as caller
- * is responsible to make sure it's free.
- */
- if (!convert) {
- ret = find_free_dev_extent(device, num_bytes, start, NULL);
- if (ret)
- goto err;
- }
-
key.objectid = device->devid;
- key.offset = *start;
+ key.offset = start;
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_insert_empty_item(trans, root, path, &key,
sizeof(*extent));
@@ -583,6 +575,22 @@ err:
return ret;
}
+/*
+ * Allocate one free dev extent and insert it into the fs.
+ */
+static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_device *device,
+ u64 chunk_offset, u64 num_bytes, u64 *start)
+{
+ int ret;
+
+ ret = find_free_dev_extent(device, num_bytes, start, NULL);
+ if (ret)
+ return ret;
+ return btrfs_insert_dev_extent(trans, device, chunk_offset, num_bytes,
+ *start);
+}
+
static int find_next_chunk(struct btrfs_fs_info *fs_info, u64 *offset)
{
struct btrfs_root *root = fs_info->chunk_root;
@@ -1107,7 +1115,7 @@ again:
list_move_tail(&device->dev_list, dev_list);
ret = btrfs_alloc_dev_extent(trans, device, key.offset,
- calc_size, &dev_offset, 0);
+ calc_size, &dev_offset);
if (ret < 0)
goto out_chunk_map;
@@ -1241,8 +1249,12 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle
*trans,
while (index < num_stripes) {
struct btrfs_stripe *stripe;
- ret = btrfs_alloc_dev_extent(trans, device, key.offset,
- calc_size, &dev_offset, convert);
+ if (convert)
+ ret = btrfs_insert_dev_extent(trans, device, key.offset,
+ calc_size, dev_offset);
+ else
+ ret = btrfs_alloc_dev_extent(trans, device, key.offset,
+ calc_size, &dev_offset);
BUG_ON(ret);
device->bytes_used += calc_size;
diff --git a/volumes.h b/volumes.h
index b4ea93f0bec3..44284ee75adb 100644
--- a/volumes.h
+++ b/volumes.h
@@ -268,6 +268,9 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
int flags);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_close_all_devices(void);
+int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans,
+ struct btrfs_device *device,
+ u64 chunk_offset, u64 num_bytes, u64 start);
int btrfs_add_device(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_device *device);
--
2.19.2
