+ /* We must ensure dedupe_enabled is modified after dedupe_info */
+ smp_wmb();
+ fs_info->dedupe_enabled = 1;
+out:
+ if (ret < 0) {
+ crypto_free_shash(dedupe_info->dedupe_driver);
+ kfree(dedupe_info);
+ }
+ return ret;
+}
+
+int btrfs_dedupe_resume(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *dedupe_root)
+{
+ struct btrfs_dedupe_info *dedupe_info;
+ struct btrfs_dedupe_status_item *status;
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ u64 blocksize;
+ u64 limit;
+ u16 type;
+ u16 backend;
+ int ret = 0;
+
+ path = btrfs_alloc_path();
+ if (!path)
return -ENOMEM;
- dedupe_info->hash_type = type;
- dedupe_info->backend = backend;
- dedupe_info->blocksize = blocksize;
- dedupe_info->limit_nr = limit;
+ key.objectid = 0;
+ key.type = BTRFS_DEDUPE_STATUS_ITEM_KEY;
+ key.offset = 0;
- /* Only support SHA256 yet */
- dedupe_info->dedupe_driver = crypto_alloc_shash("sha256", 0, 0);
- if (IS_ERR(dedupe_info->dedupe_driver)) {
- btrfs_err(fs_info, "failed to init sha256 driver");
- ret = PTR_ERR(dedupe_info->dedupe_driver);
+ ret = btrfs_search_slot(NULL, dedupe_root, &key, path, 0, 0);
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ } else if (ret < 0) {
goto out;
}
- dedupe_info->hash_root = RB_ROOT;
- dedupe_info->bytenr_root = RB_ROOT;
- dedupe_info->current_nr = 0;
- INIT_LIST_HEAD(&dedupe_info->lru_list);
- mutex_init(&dedupe_info->lock);
+ status = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_dedupe_status_item);
+ blocksize = btrfs_dedupe_status_blocksize(path->nodes[0], status);
+ limit = btrfs_dedupe_status_limit(path->nodes[0], status);
+ type = btrfs_dedupe_status_hash_type(path->nodes[0], status);
+ backend = btrfs_dedupe_status_backend(path->nodes[0], status);
+
+ ret = init_dedupe_info(&dedupe_info, type, backend, blocksize, limit);
+ if (ret < 0)
+ goto out;
+ dedupe_info->dedupe_root = dedupe_root;
fs_info->dedupe_info = dedupe_info;
/* We must ensure dedupe_enabled is modified after dedupe_info */
@@ -111,11 +256,36 @@ enable:
fs_info->dedupe_enabled = 1;
out:
- if (ret < 0)
- kfree(dedupe_info);
+ btrfs_free_path(path);
return ret;
}
+static void inmem_destroy(struct btrfs_dedupe_info *dedupe_info);
+int btrfs_dedupe_cleanup(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_dedupe_info *dedupe_info;
+
+ fs_info->dedupe_enabled = 0;
+
+ /* same as disable */
+ smp_wmb();
+ dedupe_info = fs_info->dedupe_info;
+ fs_info->dedupe_info = NULL;
+
+ if (!dedupe_info)
+ return 0;
+
+ if (dedupe_info->backend == BTRFS_DEDUPE_BACKEND_INMEMORY)
+ inmem_destroy(dedupe_info);
+ if (dedupe_info->dedupe_root) {
+ free_root_extent_buffers(dedupe_info->dedupe_root);
+ kfree(dedupe_info->dedupe_root);
+ }
+ crypto_free_shash(dedupe_info->dedupe_driver);
+ kfree(dedupe_info);
+ return 0;
+}
+
static int inmem_insert_hash(struct rb_root *root,
struct inmem_hash *hash, int hash_len)
{
@@ -325,6 +495,65 @@ static void inmem_destroy(struct btrfs_dedupe_info
*dedupe_info)
mutex_unlock(&dedupe_info->lock);
}
+static int remove_dedupe_tree(struct btrfs_root *dedupe_root)
+{
+ struct btrfs_trans_handle *trans;
+ struct btrfs_fs_info *fs_info = dedupe_root->fs_info;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ struct extent_buffer *node;
+ int ret;
+ int nr;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ trans = btrfs_start_transaction(fs_info->tree_root, 2);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out;
+ }
+
+ path->leave_spinning = 1;
+ key.objectid = 0;
+ key.offset = 0;
+ key.type = 0;
+
+ while (1) {
+ ret = btrfs_search_slot(trans, dedupe_root, &key, path, -1, 1);
+ if (ret < 0)
+ goto out;
+ node = path->nodes[0];
+ nr = btrfs_header_nritems(node);
+ if (nr == 0) {
+ btrfs_release_path(path);
+ break;
+ }
+ path->slots[0] = 0;
+ ret = btrfs_del_items(trans, dedupe_root, path, 0, nr);
+ if (ret)
+ goto out;
+ btrfs_release_path(path);
+ }
+
+ ret = btrfs_del_root(trans, fs_info->tree_root, &dedupe_root->root_key);
+ if (ret)
+ goto out;
+
+ list_del(&dedupe_root->dirty_list);
+ btrfs_tree_lock(dedupe_root->node);
+ clean_tree_block(trans, fs_info, dedupe_root->node);
+ btrfs_tree_unlock(dedupe_root->node);
+ btrfs_free_tree_block(trans, dedupe_root, dedupe_root->node, 0, 1);
+ free_extent_buffer(dedupe_root->node);
+ free_extent_buffer(dedupe_root->commit_root);
+ kfree(dedupe_root);
+ ret = btrfs_commit_transaction(trans, fs_info->tree_root);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
int btrfs_dedupe_disable(struct btrfs_fs_info *fs_info)
{
struct btrfs_dedupe_info *dedupe_info;
@@ -358,10 +587,12 @@ int btrfs_dedupe_disable(struct btrfs_fs_info *fs_info)
/* now we are OK to clean up everything */
if (dedupe_info->backend == BTRFS_DEDUPE_BACKEND_INMEMORY)
inmem_destroy(dedupe_info);
+ if (dedupe_info->dedupe_root)
+ ret = remove_dedupe_tree(dedupe_info->dedupe_root);
crypto_free_shash(dedupe_info->dedupe_driver);
kfree(dedupe_info);
- return 0;
+ return ret;
}
/*
diff --git a/fs/btrfs/dedupe.h b/fs/btrfs/dedupe.h
index 537f0b8..120e630 100644
--- a/fs/btrfs/dedupe.h
+++ b/fs/btrfs/dedupe.h
@@ -112,6 +112,19 @@ int btrfs_dedupe_enable(struct btrfs_fs_info *fs_info, u16
type, u16 backend,
*/
int btrfs_dedupe_disable(struct btrfs_fs_info *fs_info);
+ /*
+ * Restore previous dedupe setup from disk
+ * Called at mount time
+ */
+int btrfs_dedupe_resume(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *dedupe_root);
+
+/*
+ * Cleanup current btrfs_dedupe_info
+ * Called in umount time
+ */
+int btrfs_dedupe_cleanup(struct btrfs_fs_info *fs_info);
+
/*
* Calculate hash for dedup.
* Caller must ensure [start, start + dedupe_bs) has valid data.
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 57ae928..44d098d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -51,6 +51,7 @@
#include "sysfs.h"
#include "qgroup.h"
#include "compression.h"
+#include "dedupe.h"
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
@@ -2156,7 +2157,7 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info
*fs_info)
btrfs_destroy_workqueue(fs_info->extent_workers);
}
-static void free_root_extent_buffers(struct btrfs_root *root)
+void free_root_extent_buffers(struct btrfs_root *root)
{
if (root) {
free_extent_buffer(root->node);
@@ -2490,7 +2491,21 @@ static int btrfs_read_roots(struct btrfs_fs_info
*fs_info,
fs_info->free_space_root = root;
}
- return 0;
+ location.objectid = BTRFS_DEDUPE_TREE_OBJECTID;
+ root = btrfs_read_tree_root(tree_root, &location);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
+ if (ret != -ENOENT)
+ return ret;
+ return 0;
+ }
+ set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+ ret = btrfs_dedupe_resume(fs_info, root);
+ if (ret < 0) {
+ free_root_extent_buffers(root);
+ kfree(root);
+ }
+ return ret;
}
int open_ctree(struct super_block *sb,
@@ -3885,6 +3900,8 @@ void close_ctree(struct btrfs_root *root)
btrfs_free_qgroup_config(fs_info);
+ btrfs_dedupe_cleanup(fs_info);
+
if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
btrfs_info(fs_info, "at unmount delalloc count %lld",
percpu_counter_sum(&fs_info->delalloc_bytes));
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 8e79d00..42c4ff2 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -70,6 +70,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_root
*tree_root,
int btrfs_init_fs_root(struct btrfs_root *root);
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
struct btrfs_root *root);
+void free_root_extent_buffers(struct btrfs_root *root);
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
--
2.7.3
--
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