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authorQu Wenruo <quwenruo@cn.fujitsu.com>2016-01-29 13:03:22 +0800
committerDavid Sterba <dsterba@suse.com>2016-06-07 18:15:19 +0200
commitf07c8149718e2b841b91269cc2c0d5ed92df1bca (patch)
tree4c15d98448fe61af3085441c50c9cdc59e0ab9e8 /volumes.c
parentfca2f8a8fda7456402ce4bee9093414851bbfe01 (diff)
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btrfs-progs: Introduce function to create convert data chunks
Introduce new function, make_convert_data_chunks(), to build up data chunks for convert. It will call a modified version of btrfs_alloc_data_chunk() to force data chunks to covert all known ext* data. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'volumes.c')
-rw-r--r--volumes.c46
1 files changed, 34 insertions, 12 deletions
diff --git a/volumes.c b/volumes.c
index 45ef26f..ccfa732 100644
--- a/volumes.c
+++ b/volumes.c
@@ -399,7 +399,7 @@ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 chunk_tree, u64 chunk_objectid,
u64 chunk_offset,
- u64 num_bytes, u64 *start)
+ u64 num_bytes, u64 *start, int convert)
{
int ret;
struct btrfs_path *path;
@@ -412,9 +412,15 @@ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
- ret = find_free_dev_extent(trans, device, path, num_bytes, start);
- if (ret) {
- goto err;
+ /*
+ * 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(trans, device, path, num_bytes,
+ start);
+ if (ret)
+ goto err;
}
key.objectid = device->devid;
@@ -973,7 +979,7 @@ again:
ret = btrfs_alloc_dev_extent(trans, device,
info->chunk_root->root_key.objectid,
BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset,
- calc_size, &dev_offset);
+ calc_size, &dev_offset, 0);
BUG_ON(ret);
device->bytes_used += calc_size;
@@ -1029,9 +1035,17 @@ again:
return ret;
}
+/*
+ * Alloc a DATA chunk with SINGLE profile.
+ *
+ * If 'convert' is set, it will alloc a chunk with 1:1 mapping
+ * (btrfs logical bytenr == on-disk bytenr)
+ * For that case, caller must make sure the chunk and dev_extent are not
+ * occupied.
+ */
int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 *start,
- u64 num_bytes, u64 type)
+ u64 num_bytes, u64 type, int convert)
{
u64 dev_offset;
struct btrfs_fs_info *info = extent_root->fs_info;
@@ -1052,10 +1066,17 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.type = BTRFS_CHUNK_ITEM_KEY;
- ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID,
- &key.offset);
- if (ret)
- return ret;
+ if (convert) {
+ BUG_ON(*start != round_down(*start, extent_root->sectorsize));
+ key.offset = *start;
+ dev_offset = *start;
+ } else {
+ ret = find_next_chunk(chunk_root,
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID,
+ &key.offset);
+ if (ret)
+ return ret;
+ }
chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS);
if (!chunk)
@@ -1080,7 +1101,7 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
ret = btrfs_alloc_dev_extent(trans, device,
info->chunk_root->root_key.objectid,
BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset,
- calc_size, &dev_offset);
+ calc_size, &dev_offset, convert);
BUG_ON(ret);
device->bytes_used += calc_size;
@@ -1117,7 +1138,8 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
btrfs_chunk_item_size(num_stripes));
BUG_ON(ret);
- *start = key.offset;
+ if (!convert)
+ *start = key.offset;
map->ce.start = key.offset;
map->ce.size = num_bytes;