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-rw-r--r--fs/btrfs/backref.c33
-rw-r--r--fs/btrfs/ctree.c88
-rw-r--r--fs/btrfs/ctree.h3
-rw-r--r--fs/btrfs/disk-io.c3
-rw-r--r--fs/btrfs/extent-tree.c20
-rw-r--r--fs/btrfs/inode-map.c14
-rw-r--r--fs/btrfs/send.c57
-rw-r--r--fs/btrfs/transaction.c45
-rw-r--r--fs/btrfs/transaction.h1
9 files changed, 77 insertions, 187 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index aad7201ad11b..10db21fa0926 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -330,7 +330,10 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
goto out;
}
- root_level = btrfs_old_root_level(root, time_seq);
+ if (path->search_commit_root)
+ root_level = btrfs_header_level(root->commit_root);
+ else
+ root_level = btrfs_old_root_level(root, time_seq);
if (root_level + 1 == level) {
srcu_read_unlock(&fs_info->subvol_srcu, index);
@@ -1099,9 +1102,9 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
*
* returns 0 on success, < 0 on error.
*/
-int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info, u64 bytenr,
- u64 time_seq, struct ulist **roots)
+static int __btrfs_find_all_roots(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 time_seq, struct ulist **roots)
{
struct ulist *tmp;
struct ulist_node *node = NULL;
@@ -1137,6 +1140,20 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
return 0;
}
+int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 time_seq, struct ulist **roots)
+{
+ int ret;
+
+ if (!trans)
+ down_read(&fs_info->commit_root_sem);
+ ret = __btrfs_find_all_roots(trans, fs_info, bytenr, time_seq, roots);
+ if (!trans)
+ up_read(&fs_info->commit_root_sem);
+ return ret;
+}
+
/*
* this makes the path point to (inum INODE_ITEM ioff)
*/
@@ -1516,6 +1533,8 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
if (IS_ERR(trans))
return PTR_ERR(trans);
btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);
+ } else {
+ down_read(&fs_info->commit_root_sem);
}
ret = btrfs_find_all_leafs(trans, fs_info, extent_item_objectid,
@@ -1526,8 +1545,8 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
ULIST_ITER_INIT(&ref_uiter);
while (!ret && (ref_node = ulist_next(refs, &ref_uiter))) {
- ret = btrfs_find_all_roots(trans, fs_info, ref_node->val,
- tree_mod_seq_elem.seq, &roots);
+ ret = __btrfs_find_all_roots(trans, fs_info, ref_node->val,
+ tree_mod_seq_elem.seq, &roots);
if (ret)
break;
ULIST_ITER_INIT(&root_uiter);
@@ -1549,6 +1568,8 @@ out:
if (!search_commit_root) {
btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
btrfs_end_transaction(trans, fs_info->extent_root);
+ } else {
+ up_read(&fs_info->commit_root_sem);
}
return ret;
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 88d1b1eedc9c..9d89c1648e8e 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -5360,7 +5360,6 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
{
int ret;
int cmp;
- struct btrfs_trans_handle *trans = NULL;
struct btrfs_path *left_path = NULL;
struct btrfs_path *right_path = NULL;
struct btrfs_key left_key;
@@ -5378,9 +5377,6 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
u64 right_blockptr;
u64 left_gen;
u64 right_gen;
- u64 left_start_ctransid;
- u64 right_start_ctransid;
- u64 ctransid;
left_path = btrfs_alloc_path();
if (!left_path) {
@@ -5404,21 +5400,6 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
right_path->search_commit_root = 1;
right_path->skip_locking = 1;
- spin_lock(&left_root->root_item_lock);
- left_start_ctransid = btrfs_root_ctransid(&left_root->root_item);
- spin_unlock(&left_root->root_item_lock);
-
- spin_lock(&right_root->root_item_lock);
- right_start_ctransid = btrfs_root_ctransid(&right_root->root_item);
- spin_unlock(&right_root->root_item_lock);
-
- trans = btrfs_join_transaction(left_root);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- trans = NULL;
- goto out;
- }
-
/*
* Strategy: Go to the first items of both trees. Then do
*
@@ -5482,67 +5463,6 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
advance_left = advance_right = 0;
while (1) {
- /*
- * We need to make sure the transaction does not get committed
- * while we do anything on commit roots. This means, we need to
- * join and leave transactions for every item that we process.
- */
- if (trans && btrfs_should_end_transaction(trans, left_root)) {
- btrfs_release_path(left_path);
- btrfs_release_path(right_path);
-
- ret = btrfs_end_transaction(trans, left_root);
- trans = NULL;
- if (ret < 0)
- goto out;
- }
- /* now rejoin the transaction */
- if (!trans) {
- trans = btrfs_join_transaction(left_root);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- trans = NULL;
- goto out;
- }
-
- spin_lock(&left_root->root_item_lock);
- ctransid = btrfs_root_ctransid(&left_root->root_item);
- spin_unlock(&left_root->root_item_lock);
- if (ctransid != left_start_ctransid)
- left_start_ctransid = 0;
-
- spin_lock(&right_root->root_item_lock);
- ctransid = btrfs_root_ctransid(&right_root->root_item);
- spin_unlock(&right_root->root_item_lock);
- if (ctransid != right_start_ctransid)
- right_start_ctransid = 0;
-
- if (!left_start_ctransid || !right_start_ctransid) {
- WARN(1, KERN_WARNING
- "BTRFS: btrfs_compare_tree detected "
- "a change in one of the trees while "
- "iterating. This is probably a "
- "bug.\n");
- ret = -EIO;
- goto out;
- }
-
- /*
- * the commit root may have changed, so start again
- * where we stopped
- */
- left_path->lowest_level = left_level;
- right_path->lowest_level = right_level;
- ret = btrfs_search_slot(NULL, left_root,
- &left_key, left_path, 0, 0);
- if (ret < 0)
- goto out;
- ret = btrfs_search_slot(NULL, right_root,
- &right_key, right_path, 0, 0);
- if (ret < 0)
- goto out;
- }
-
if (advance_left && !left_end_reached) {
ret = tree_advance(left_root, left_path, &left_level,
left_root_level,
@@ -5672,14 +5592,6 @@ out:
btrfs_free_path(left_path);
btrfs_free_path(right_path);
kfree(tmp_buf);
-
- if (trans) {
- if (!ret)
- ret = btrfs_end_transaction(trans, left_root);
- else
- btrfs_end_transaction(trans, left_root);
- }
-
return ret;
}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2a9d32e193a5..4253ab257c9c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1440,7 +1440,7 @@ struct btrfs_fs_info {
*/
struct mutex ordered_extent_flush_mutex;
- struct rw_semaphore extent_commit_sem;
+ struct rw_semaphore commit_root_sem;
struct rw_semaphore cleanup_work_sem;
@@ -1711,7 +1711,6 @@ struct btrfs_root {
struct btrfs_block_rsv *block_rsv;
/* free ino cache stuff */
- struct mutex fs_commit_mutex;
struct btrfs_free_space_ctl *free_ino_ctl;
enum btrfs_caching_type cached;
spinlock_t cache_lock;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 98fe70193397..6d1ac7d46f81 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1567,7 +1567,6 @@ int btrfs_init_fs_root(struct btrfs_root *root)
root->subv_writers = writers;
btrfs_init_free_ino_ctl(root);
- mutex_init(&root->fs_commit_mutex);
spin_lock_init(&root->cache_lock);
init_waitqueue_head(&root->cache_wait);
@@ -2345,7 +2344,7 @@ int open_ctree(struct super_block *sb,
mutex_init(&fs_info->transaction_kthread_mutex);
mutex_init(&fs_info->cleaner_mutex);
mutex_init(&fs_info->volume_mutex);
- init_rwsem(&fs_info->extent_commit_sem);
+ init_rwsem(&fs_info->commit_root_sem);
init_rwsem(&fs_info->cleanup_work_sem);
init_rwsem(&fs_info->subvol_sem);
sema_init(&fs_info->uuid_tree_rescan_sem, 1);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e09db2c2f3b4..4d2508bbf6f0 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -419,7 +419,7 @@ static noinline void caching_thread(struct btrfs_work *work)
again:
mutex_lock(&caching_ctl->mutex);
/* need to make sure the commit_root doesn't disappear */
- down_read(&fs_info->extent_commit_sem);
+ down_read(&fs_info->commit_root_sem);
next:
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
@@ -443,10 +443,10 @@ next:
break;
if (need_resched() ||
- rwsem_is_contended(&fs_info->extent_commit_sem)) {
+ rwsem_is_contended(&fs_info->commit_root_sem)) {
caching_ctl->progress = last;
btrfs_release_path(path);
- up_read(&fs_info->extent_commit_sem);
+ up_read(&fs_info->commit_root_sem);
mutex_unlock(&caching_ctl->mutex);
cond_resched();
goto again;
@@ -513,7 +513,7 @@ next:
err:
btrfs_free_path(path);
- up_read(&fs_info->extent_commit_sem);
+ up_read(&fs_info->commit_root_sem);
free_excluded_extents(extent_root, block_group);
@@ -633,10 +633,10 @@ static int cache_block_group(struct btrfs_block_group_cache *cache,
return 0;
}
- down_write(&fs_info->extent_commit_sem);
+ down_write(&fs_info->commit_root_sem);
atomic_inc(&caching_ctl->count);
list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups);
- up_write(&fs_info->extent_commit_sem);
+ up_write(&fs_info->commit_root_sem);
btrfs_get_block_group(cache);
@@ -5471,7 +5471,7 @@ void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
struct btrfs_block_group_cache *cache;
struct btrfs_space_info *space_info;
- down_write(&fs_info->extent_commit_sem);
+ down_write(&fs_info->commit_root_sem);
list_for_each_entry_safe(caching_ctl, next,
&fs_info->caching_block_groups, list) {
@@ -5490,7 +5490,7 @@ void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
else
fs_info->pinned_extents = &fs_info->freed_extents[0];
- up_write(&fs_info->extent_commit_sem);
+ up_write(&fs_info->commit_root_sem);
list_for_each_entry_rcu(space_info, &fs_info->space_info, list)
percpu_counter_set(&space_info->total_bytes_pinned, 0);
@@ -8256,14 +8256,14 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
struct btrfs_caching_control *caching_ctl;
struct rb_node *n;
- down_write(&info->extent_commit_sem);
+ down_write(&info->commit_root_sem);
while (!list_empty(&info->caching_block_groups)) {
caching_ctl = list_entry(info->caching_block_groups.next,
struct btrfs_caching_control, list);
list_del(&caching_ctl->list);
put_caching_control(caching_ctl);
}
- up_write(&info->extent_commit_sem);
+ up_write(&info->commit_root_sem);
spin_lock(&info->block_group_cache_lock);
while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index ab485e57b6fe..cc8ca193d830 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -55,7 +55,7 @@ static int caching_kthread(void *data)
key.type = BTRFS_INODE_ITEM_KEY;
again:
/* need to make sure the commit_root doesn't disappear */
- mutex_lock(&root->fs_commit_mutex);
+ down_read(&fs_info->commit_root_sem);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
@@ -88,7 +88,7 @@ again:
btrfs_item_key_to_cpu(leaf, &key, 0);
btrfs_release_path(path);
root->cache_progress = last;
- mutex_unlock(&root->fs_commit_mutex);
+ up_read(&fs_info->commit_root_sem);
schedule_timeout(1);
goto again;
} else
@@ -127,7 +127,7 @@ next:
btrfs_unpin_free_ino(root);
out:
wake_up(&root->cache_wait);
- mutex_unlock(&root->fs_commit_mutex);
+ up_read(&fs_info->commit_root_sem);
btrfs_free_path(path);
@@ -223,11 +223,11 @@ again:
* or the caching work is done.
*/
- mutex_lock(&root->fs_commit_mutex);
+ down_write(&root->fs_info->commit_root_sem);
spin_lock(&root->cache_lock);
if (root->cached == BTRFS_CACHE_FINISHED) {
spin_unlock(&root->cache_lock);
- mutex_unlock(&root->fs_commit_mutex);
+ up_write(&root->fs_info->commit_root_sem);
goto again;
}
spin_unlock(&root->cache_lock);
@@ -240,7 +240,7 @@ again:
else
__btrfs_add_free_space(pinned, objectid, 1);
- mutex_unlock(&root->fs_commit_mutex);
+ up_write(&root->fs_info->commit_root_sem);
}
}
@@ -250,7 +250,7 @@ again:
* and others will just be dropped, because the commit root we were
* searching has changed.
*
- * Must be called with root->fs_commit_mutex held
+ * Must be called with root->fs_info->commit_root_sem held
*/
void btrfs_unpin_free_ino(struct btrfs_root *root)
{
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index d00534b78382..6b5f13659317 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1268,8 +1268,10 @@ static int find_extent_clone(struct send_ctx *sctx,
}
logical = disk_byte + btrfs_file_extent_offset(eb, fi);
+ down_read(&sctx->send_root->fs_info->commit_root_sem);
ret = extent_from_logical(sctx->send_root->fs_info, disk_byte, tmp_path,
&found_key, &flags);
+ up_read(&sctx->send_root->fs_info->commit_root_sem);
btrfs_release_path(tmp_path);
if (ret < 0)
@@ -5367,57 +5369,21 @@ out:
static int full_send_tree(struct send_ctx *sctx)
{
int ret;
- struct btrfs_trans_handle *trans = NULL;
struct btrfs_root *send_root = sctx->send_root;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_path *path;
struct extent_buffer *eb;
int slot;
- u64 start_ctransid;
- u64 ctransid;
path = alloc_path_for_send();
if (!path)
return -ENOMEM;
- spin_lock(&send_root->root_item_lock);
- start_ctransid = btrfs_root_ctransid(&send_root->root_item);
- spin_unlock(&send_root->root_item_lock);
-
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
-join_trans:
- /*
- * We need to make sure the transaction does not get committed
- * while we do anything on commit roots. Join a transaction to prevent
- * this.
- */
- trans = btrfs_join_transaction(send_root);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- trans = NULL;
- goto out;
- }
-
- /*
- * Make sure the tree has not changed after re-joining. We detect this
- * by comparing start_ctransid and ctransid. They should always match.
- */
- spin_lock(&send_root->root_item_lock);
- ctransid = btrfs_root_ctransid(&send_root->root_item);
- spin_unlock(&send_root->root_item_lock);
-
- if (ctransid != start_ctransid) {
- WARN(1, KERN_WARNING "BTRFS: the root that you're trying to "
- "send was modified in between. This is "
- "probably a bug.\n");
- ret = -EIO;
- goto out;
- }
-
ret = btrfs_search_slot_for_read(send_root, &key, path, 1, 0);
if (ret < 0)
goto out;
@@ -5425,19 +5391,6 @@ join_trans:
goto out_finish;
while (1) {
- /*
- * When someone want to commit while we iterate, end the
- * joined transaction and rejoin.
- */
- if (btrfs_should_end_transaction(trans, send_root)) {
- ret = btrfs_end_transaction(trans, send_root);
- trans = NULL;
- if (ret < 0)
- goto out;
- btrfs_release_path(path);
- goto join_trans;
- }
-
eb = path->nodes[0];
slot = path->slots[0];
btrfs_item_key_to_cpu(eb, &found_key, slot);
@@ -5465,12 +5418,6 @@ out_finish:
out:
btrfs_free_path(path);
- if (trans) {
- if (!ret)
- ret = btrfs_end_transaction(trans, send_root);
- else
- btrfs_end_transaction(trans, send_root);
- }
return ret;
}
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 038177cfabbb..7579f6d0b854 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -75,10 +75,21 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction)
}
}
-static noinline void switch_commit_root(struct btrfs_root *root)
+static noinline void switch_commit_roots(struct btrfs_transaction *trans,
+ struct btrfs_fs_info *fs_info)
{
- free_extent_buffer(root->commit_root);
- root->commit_root = btrfs_root_node(root);
+ struct btrfs_root *root, *tmp;
+
+ down_write(&fs_info->commit_root_sem);
+ list_for_each_entry_safe(root, tmp, &trans->switch_commits,
+ dirty_list) {
+ list_del_init(&root->dirty_list);
+ free_extent_buffer(root->commit_root);
+ root->commit_root = btrfs_root_node(root);
+ if (is_fstree(root->objectid))
+ btrfs_unpin_free_ino(root);
+ }
+ up_write(&fs_info->commit_root_sem);
}
static inline void extwriter_counter_inc(struct btrfs_transaction *trans,
@@ -208,6 +219,7 @@ loop:
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
INIT_LIST_HEAD(&cur_trans->ordered_operations);
INIT_LIST_HEAD(&cur_trans->pending_chunks);
+ INIT_LIST_HEAD(&cur_trans->switch_commits);
list_add_tail(&cur_trans->list, &fs_info->trans_list);
extent_io_tree_init(&cur_trans->dirty_pages,
fs_info->btree_inode->i_mapping);
@@ -920,9 +932,6 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
return ret;
}
- if (root != root->fs_info->extent_root)
- switch_commit_root(root);
-
return 0;
}
@@ -978,15 +987,16 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
list_del_init(next);
root = list_entry(next, struct btrfs_root, dirty_list);
+ if (root != fs_info->extent_root)
+ list_add_tail(&root->dirty_list,
+ &trans->transaction->switch_commits);
ret = update_cowonly_root(trans, root);
if (ret)
return ret;
}
- down_write(&fs_info->extent_commit_sem);
- switch_commit_root(fs_info->extent_root);
- up_write(&fs_info->extent_commit_sem);
-
+ list_add_tail(&fs_info->extent_root->dirty_list,
+ &trans->transaction->switch_commits);
btrfs_after_dev_replace_commit(fs_info);
return 0;
@@ -1043,11 +1053,8 @@ static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
smp_wmb();
if (root->commit_root != root->node) {
- mutex_lock(&root->fs_commit_mutex);
- switch_commit_root(root);
- btrfs_unpin_free_ino(root);
- mutex_unlock(&root->fs_commit_mutex);
-
+ list_add_tail(&root->dirty_list,
+ &trans->transaction->switch_commits);
btrfs_set_root_node(&root->root_item,
root->node);
}
@@ -1858,11 +1865,15 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
btrfs_set_root_node(&root->fs_info->tree_root->root_item,
root->fs_info->tree_root->node);
- switch_commit_root(root->fs_info->tree_root);
+ list_add_tail(&root->fs_info->tree_root->dirty_list,
+ &cur_trans->switch_commits);
btrfs_set_root_node(&root->fs_info->chunk_root->root_item,
root->fs_info->chunk_root->node);
- switch_commit_root(root->fs_info->chunk_root);
+ list_add_tail(&root->fs_info->chunk_root->dirty_list,
+ &cur_trans->switch_commits);
+
+ switch_commit_roots(cur_trans, root->fs_info);
assert_qgroups_uptodate(trans);
update_super_roots(root);
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 2bcba89d952e..b57b924e8e03 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -57,6 +57,7 @@ struct btrfs_transaction {
struct list_head pending_snapshots;
struct list_head ordered_operations;
struct list_head pending_chunks;
+ struct list_head switch_commits;
struct btrfs_delayed_ref_root delayed_refs;
int aborted;
};
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-19 12:22:09 +0000