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-rw-r--r--fs/btrfs/transaction.c412
1 files changed, 140 insertions, 272 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 01b143605ec1..4e83457ea253 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -25,7 +25,6 @@
#include "disk-io.h"
#include "transaction.h"
#include "locking.h"
-#include "ref-cache.h"
#include "tree-log.h"
#define BTRFS_ROOT_TRANS_TAG 0
@@ -94,45 +93,37 @@ static noinline int join_transaction(struct btrfs_root *root)
* to make sure the old root from before we joined the transaction is deleted
* when the transaction commits
*/
-noinline int btrfs_record_root_in_trans(struct btrfs_root *root)
+static noinline int record_root_in_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
{
- struct btrfs_dirty_root *dirty;
- u64 running_trans_id = root->fs_info->running_transaction->transid;
- if (root->ref_cows && root->last_trans < running_trans_id) {
+ if (root->ref_cows && root->last_trans < trans->transid) {
WARN_ON(root == root->fs_info->extent_root);
- if (root->root_item.refs != 0) {
- radix_tree_tag_set(&root->fs_info->fs_roots_radix,
- (unsigned long)root->root_key.objectid,
- BTRFS_ROOT_TRANS_TAG);
-
- dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
- BUG_ON(!dirty);
- dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS);
- BUG_ON(!dirty->root);
- dirty->latest_root = root;
- INIT_LIST_HEAD(&dirty->list);
-
- root->commit_root = btrfs_root_node(root);
-
- memcpy(dirty->root, root, sizeof(*root));
- spin_lock_init(&dirty->root->node_lock);
- spin_lock_init(&dirty->root->list_lock);
- mutex_init(&dirty->root->objectid_mutex);
- mutex_init(&dirty->root->log_mutex);
- INIT_LIST_HEAD(&dirty->root->dead_list);
- dirty->root->node = root->commit_root;
- dirty->root->commit_root = NULL;
-
- spin_lock(&root->list_lock);
- list_add(&dirty->root->dead_list, &root->dead_list);
- spin_unlock(&root->list_lock);
-
- root->dirty_root = dirty;
- } else {
- WARN_ON(1);
- }
- root->last_trans = running_trans_id;
+ WARN_ON(root->root_item.refs == 0);
+ WARN_ON(root->commit_root != root->node);
+
+ radix_tree_tag_set(&root->fs_info->fs_roots_radix,
+ (unsigned long)root->root_key.objectid,
+ BTRFS_ROOT_TRANS_TAG);
+ root->last_trans = trans->transid;
+ btrfs_init_reloc_root(trans, root);
+ }
+ return 0;
+}
+
+int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ if (!root->ref_cows)
+ return 0;
+
+ mutex_lock(&root->fs_info->trans_mutex);
+ if (root->last_trans == trans->transid) {
+ mutex_unlock(&root->fs_info->trans_mutex);
+ return 0;
}
+
+ record_root_in_trans(trans, root);
+ mutex_unlock(&root->fs_info->trans_mutex);
return 0;
}
@@ -181,7 +172,6 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
ret = join_transaction(root);
BUG_ON(ret);
- btrfs_record_root_in_trans(root);
h->transid = root->fs_info->running_transaction->transid;
h->transaction = root->fs_info->running_transaction;
h->blocks_reserved = num_blocks;
@@ -192,6 +182,7 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
h->delayed_ref_updates = 0;
root->fs_info->running_transaction->use_count++;
+ record_root_in_trans(h, root);
mutex_unlock(&root->fs_info->trans_mutex);
return h;
}
@@ -233,6 +224,7 @@ static noinline int wait_for_commit(struct btrfs_root *root,
return 0;
}
+#if 0
/*
* rate limit against the drop_snapshot code. This helps to slow down new
* operations if the drop_snapshot code isn't able to keep up.
@@ -273,6 +265,7 @@ harder:
goto harder;
}
}
+#endif
void btrfs_throttle(struct btrfs_root *root)
{
@@ -280,7 +273,6 @@ void btrfs_throttle(struct btrfs_root *root)
if (!root->fs_info->open_ioctl_trans)
wait_current_trans(root);
mutex_unlock(&root->fs_info->trans_mutex);
- throttle_on_drops(root);
}
static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
@@ -323,9 +315,6 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
memset(trans, 0, sizeof(*trans));
kmem_cache_free(btrfs_trans_handle_cachep, trans);
- if (throttle)
- throttle_on_drops(root);
-
return 0;
}
@@ -462,12 +451,8 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
old_root_bytenr = btrfs_root_bytenr(&root->root_item);
if (old_root_bytenr == root->node->start)
break;
- btrfs_set_root_bytenr(&root->root_item,
- root->node->start);
- btrfs_set_root_level(&root->root_item,
- btrfs_header_level(root->node));
- btrfs_set_root_generation(&root->root_item, trans->transid);
+ btrfs_set_root_node(&root->root_item, root->node);
ret = btrfs_update_root(trans, tree_root,
&root->root_key,
&root->root_item);
@@ -477,14 +462,16 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
BUG_ON(ret);
}
+ free_extent_buffer(root->commit_root);
+ root->commit_root = btrfs_root_node(root);
return 0;
}
/*
* update all the cowonly tree roots on disk
*/
-int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
+static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct list_head *next;
@@ -520,118 +507,54 @@ int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
* a dirty root struct and adds it into the list of dead roots that need to
* be deleted
*/
-int btrfs_add_dead_root(struct btrfs_root *root, struct btrfs_root *latest)
+int btrfs_add_dead_root(struct btrfs_root *root)
{
- struct btrfs_dirty_root *dirty;
-
- dirty = kmalloc(sizeof(*dirty), GFP_NOFS);
- if (!dirty)
- return -ENOMEM;
- dirty->root = root;
- dirty->latest_root = latest;
-
mutex_lock(&root->fs_info->trans_mutex);
- list_add(&dirty->list, &latest->fs_info->dead_roots);
+ list_add(&root->root_list, &root->fs_info->dead_roots);
mutex_unlock(&root->fs_info->trans_mutex);
return 0;
}
/*
- * at transaction commit time we need to schedule the old roots for
- * deletion via btrfs_drop_snapshot. This runs through all the
- * reference counted roots that were modified in the current
- * transaction and puts them into the drop list
+ * update all the cowonly tree roots on disk
*/
-static noinline int add_dirty_roots(struct btrfs_trans_handle *trans,
- struct radix_tree_root *radix,
- struct list_head *list)
+static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
{
- struct btrfs_dirty_root *dirty;
struct btrfs_root *gang[8];
- struct btrfs_root *root;
+ struct btrfs_fs_info *fs_info = root->fs_info;
int i;
int ret;
int err = 0;
- u32 refs;
while (1) {
- ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0,
+ ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix,
+ (void **)gang, 0,
ARRAY_SIZE(gang),
BTRFS_ROOT_TRANS_TAG);
if (ret == 0)
break;
for (i = 0; i < ret; i++) {
root = gang[i];
- radix_tree_tag_clear(radix,
- (unsigned long)root->root_key.objectid,
- BTRFS_ROOT_TRANS_TAG);
-
- BUG_ON(!root->ref_tree);
- dirty = root->dirty_root;
+ radix_tree_tag_clear(&fs_info->fs_roots_radix,
+ (unsigned long)root->root_key.objectid,
+ BTRFS_ROOT_TRANS_TAG);
btrfs_free_log(trans, root);
- btrfs_free_reloc_root(trans, root);
-
- if (root->commit_root == root->node) {
- WARN_ON(root->node->start !=
- btrfs_root_bytenr(&root->root_item));
+ btrfs_update_reloc_root(trans, root);
+ if (root->commit_root != root->node) {
free_extent_buffer(root->commit_root);
- root->commit_root = NULL;
- root->dirty_root = NULL;
-
- spin_lock(&root->list_lock);
- list_del_init(&dirty->root->dead_list);
- spin_unlock(&root->list_lock);
-
- kfree(dirty->root);
- kfree(dirty);
-
- /* make sure to update the root on disk
- * so we get any updates to the block used
- * counts
- */
- err = btrfs_update_root(trans,
- root->fs_info->tree_root,
- &root->root_key,
- &root->root_item);
- continue;
+ root->commit_root = btrfs_root_node(root);
+ btrfs_set_root_node(&root->root_item,
+ root->node);
}
- memset(&root->root_item.drop_progress, 0,
- sizeof(struct btrfs_disk_key));
- root->root_item.drop_level = 0;
- root->commit_root = NULL;
- root->dirty_root = NULL;
- root->root_key.offset = root->fs_info->generation;
- btrfs_set_root_bytenr(&root->root_item,
- root->node->start);
- btrfs_set_root_level(&root->root_item,
- btrfs_header_level(root->node));
- btrfs_set_root_generation(&root->root_item,
- root->root_key.offset);
-
- err = btrfs_insert_root(trans, root->fs_info->tree_root,
+ err = btrfs_update_root(trans, fs_info->tree_root,
&root->root_key,
&root->root_item);
if (err)
break;
-
- refs = btrfs_root_refs(&dirty->root->root_item);
- btrfs_set_root_refs(&dirty->root->root_item, refs - 1);
- err = btrfs_update_root(trans, root->fs_info->tree_root,
- &dirty->root->root_key,
- &dirty->root->root_item);
-
- BUG_ON(err);
- if (refs == 1) {
- list_add(&dirty->list, list);
- } else {
- WARN_ON(1);
- free_extent_buffer(dirty->root->node);
- kfree(dirty->root);
- kfree(dirty);
- }
}
}
return err;
@@ -688,12 +611,8 @@ static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info)
TASK_UNINTERRUPTIBLE);
mutex_unlock(&info->trans_mutex);
- atomic_dec(&info->throttles);
- wake_up(&info->transaction_throttle);
-
schedule();
- atomic_inc(&info->throttles);
mutex_lock(&info->trans_mutex);
finish_wait(&info->transaction_wait, &wait);
}
@@ -705,111 +624,61 @@ static noinline int wait_transaction_pre_flush(struct btrfs_fs_info *info)
* Given a list of roots that need to be deleted, call btrfs_drop_snapshot on
* all of them
*/
-static noinline int drop_dirty_roots(struct btrfs_root *tree_root,
- struct list_head *list)
+int btrfs_drop_dead_root(struct btrfs_root *root)
{
- struct btrfs_dirty_root *dirty;
struct btrfs_trans_handle *trans;
+ struct btrfs_root *tree_root = root->fs_info->tree_root;
unsigned long nr;
- u64 num_bytes;
- u64 bytes_used;
- u64 max_useless;
- int ret = 0;
- int err;
-
- while (!list_empty(list)) {
- struct btrfs_root *root;
-
- dirty = list_entry(list->prev, struct btrfs_dirty_root, list);
- list_del_init(&dirty->list);
-
- num_bytes = btrfs_root_used(&dirty->root->root_item);
- root = dirty->latest_root;
- atomic_inc(&root->fs_info->throttles);
-
- while (1) {
- /*
- * we don't want to jump in and create a bunch of
- * delayed refs if the transaction is starting to close
- */
- wait_transaction_pre_flush(tree_root->fs_info);
- trans = btrfs_start_transaction(tree_root, 1);
-
- /*
- * we've joined a transaction, make sure it isn't
- * closing right now
- */
- if (trans->transaction->delayed_refs.flushing) {
- btrfs_end_transaction(trans, tree_root);
- continue;
- }
-
- mutex_lock(&root->fs_info->drop_mutex);
- ret = btrfs_drop_snapshot(trans, dirty->root);
- if (ret != -EAGAIN)
- break;
- mutex_unlock(&root->fs_info->drop_mutex);
+ int ret;
- err = btrfs_update_root(trans,
- tree_root,
- &dirty->root->root_key,
- &dirty->root->root_item);
- if (err)
- ret = err;
- nr = trans->blocks_used;
- ret = btrfs_end_transaction(trans, tree_root);
- BUG_ON(ret);
+ while (1) {
+ /*
+ * we don't want to jump in and create a bunch of
+ * delayed refs if the transaction is starting to close
+ */
+ wait_transaction_pre_flush(tree_root->fs_info);
+ trans = btrfs_start_transaction(tree_root, 1);
- btrfs_btree_balance_dirty(tree_root, nr);
- cond_resched();
+ /*
+ * we've joined a transaction, make sure it isn't
+ * closing right now
+ */
+ if (trans->transaction->delayed_refs.flushing) {
+ btrfs_end_transaction(trans, tree_root);
+ continue;
}
- BUG_ON(ret);
- atomic_dec(&root->fs_info->throttles);
- wake_up(&root->fs_info->transaction_throttle);
- num_bytes -= btrfs_root_used(&dirty->root->root_item);
- bytes_used = btrfs_root_used(&root->root_item);
- if (num_bytes) {
- mutex_lock(&root->fs_info->trans_mutex);
- btrfs_record_root_in_trans(root);
- mutex_unlock(&root->fs_info->trans_mutex);
- btrfs_set_root_used(&root->root_item,
- bytes_used - num_bytes);
- }
+ ret = btrfs_drop_snapshot(trans, root);
+ if (ret != -EAGAIN)
+ break;
- ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key);
- if (ret) {
- BUG();
+ ret = btrfs_update_root(trans, tree_root,
+ &root->root_key,
+ &root->root_item);
+ if (ret)
break;
- }
- mutex_unlock(&root->fs_info->drop_mutex);
-
- spin_lock(&root->list_lock);
- list_del_init(&dirty->root->dead_list);
- if (!list_empty(&root->dead_list)) {
- struct btrfs_root *oldest;
- oldest = list_entry(root->dead_list.prev,
- struct btrfs_root, dead_list);
- max_useless = oldest->root_key.offset - 1;
- } else {
- max_useless = root->root_key.offset - 1;
- }
- spin_unlock(&root->list_lock);
nr = trans->blocks_used;
ret = btrfs_end_transaction(trans, tree_root);
BUG_ON(ret);
- ret = btrfs_remove_leaf_refs(root, max_useless, 0);
- BUG_ON(ret);
-
- free_extent_buffer(dirty->root->node);
- kfree(dirty->root);
- kfree(dirty);
-
btrfs_btree_balance_dirty(tree_root, nr);
cond_resched();
}
+ BUG_ON(ret);
+
+ ret = btrfs_del_root(trans, tree_root, &root->root_key);
+ BUG_ON(ret);
+
+ nr = trans->blocks_used;
+ ret = btrfs_end_transaction(trans, tree_root);
+ BUG_ON(ret);
+
+ free_extent_buffer(root->node);
+ free_extent_buffer(root->commit_root);
+ kfree(root);
+
+ btrfs_btree_balance_dirty(tree_root, nr);
return ret;
}
@@ -839,24 +708,23 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
if (ret)
goto fail;
- btrfs_record_root_in_trans(root);
+ record_root_in_trans(trans, root);
btrfs_set_root_last_snapshot(&root->root_item, trans->transid);
memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
key.objectid = objectid;
- key.offset = trans->transid;
+ key.offset = 0;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
old = btrfs_lock_root_node(root);
btrfs_cow_block(trans, root, old, NULL, 0, &old);
+ btrfs_set_lock_blocking(old);
btrfs_copy_root(trans, root, old, &tmp, objectid);
btrfs_tree_unlock(old);
free_extent_buffer(old);
- btrfs_set_root_bytenr(new_root_item, tmp->start);
- btrfs_set_root_level(new_root_item, btrfs_header_level(tmp));
- btrfs_set_root_generation(new_root_item, trans->transid);
+ btrfs_set_root_node(new_root_item, tmp);
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
new_root_item);
btrfs_tree_unlock(tmp);
@@ -964,6 +832,24 @@ static noinline int finish_pending_snapshots(struct btrfs_trans_handle *trans,
return 0;
}
+static void update_super_roots(struct btrfs_root *root)
+{
+ struct btrfs_root_item *root_item;
+ struct btrfs_super_block *super;
+
+ super = &root->fs_info->super_copy;
+
+ root_item = &root->fs_info->chunk_root->root_item;
+ super->chunk_root = root_item->bytenr;
+ super->chunk_root_generation = root_item->generation;
+ super->chunk_root_level = root_item->level;
+
+ root_item = &root->fs_info->tree_root->root_item;
+ super->root = root_item->bytenr;
+ super->generation = root_item->generation;
+ super->root_level = root_item->level;
+}
+
int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
@@ -971,8 +857,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
unsigned long timeout = 1;
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
- struct btrfs_root *chunk_root = root->fs_info->chunk_root;
- struct list_head dirty_fs_roots;
struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
int ret;
@@ -999,7 +883,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
BUG_ON(ret);
mutex_lock(&root->fs_info->trans_mutex);
- INIT_LIST_HEAD(&dirty_fs_roots);
if (cur_trans->in_commit) {
cur_trans->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
@@ -1105,41 +988,36 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
* with the tree-log code.
*/
mutex_lock(&root->fs_info->tree_log_mutex);
- /*
- * keep tree reloc code from adding new reloc trees
- */
- mutex_lock(&root->fs_info->tree_reloc_mutex);
-
- ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix,
- &dirty_fs_roots);
+ ret = commit_fs_roots(trans, root);
BUG_ON(ret);
- /* add_dirty_roots gets rid of all the tree log roots, it is now
+ /* commit_fs_roots gets rid of all the tree log roots, it is now
* safe to free the root of tree log roots
*/
btrfs_free_log_root_tree(trans, root->fs_info);
- ret = btrfs_commit_tree_roots(trans, root);
+ ret = commit_cowonly_roots(trans, root);
BUG_ON(ret);
cur_trans = root->fs_info->running_transaction;
spin_lock(&root->fs_info->new_trans_lock);
root->fs_info->running_transaction = NULL;
spin_unlock(&root->fs_info->new_trans_lock);
- btrfs_set_super_generation(&root->fs_info->super_copy,
- cur_trans->transid);
- btrfs_set_super_root(&root->fs_info->super_copy,
- root->fs_info->tree_root->node->start);
- btrfs_set_super_root_level(&root->fs_info->super_copy,
- btrfs_header_level(root->fs_info->tree_root->node));
-
- btrfs_set_super_chunk_root(&root->fs_info->super_copy,
- chunk_root->node->start);
- btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
- btrfs_header_level(chunk_root->node));
- btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
- btrfs_header_generation(chunk_root->node));
+
+ btrfs_set_root_node(&root->fs_info->tree_root->root_item,
+ root->fs_info->tree_root->node);
+ free_extent_buffer(root->fs_info->tree_root->commit_root);
+ root->fs_info->tree_root->commit_root =
+ btrfs_root_node(root->fs_info->tree_root);
+
+ btrfs_set_root_node(&root->fs_info->chunk_root->root_item,
+ root->fs_info->chunk_root->node);
+ free_extent_buffer(root->fs_info->chunk_root->commit_root);
+ root->fs_info->chunk_root->commit_root =
+ btrfs_root_node(root->fs_info->chunk_root);
+
+ update_super_roots(root);
if (!root->fs_info->log_root_recovering) {
btrfs_set_super_log_root(&root->fs_info->super_copy, 0);
@@ -1153,7 +1031,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
trans->transaction->blocked = 0;
- wake_up(&root->fs_info->transaction_throttle);
wake_up(&root->fs_info->transaction_wait);
mutex_unlock(&root->fs_info->trans_mutex);
@@ -1170,9 +1047,6 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
btrfs_finish_extent_commit(trans, root, pinned_copy);
kfree(pinned_copy);
- btrfs_drop_dead_reloc_roots(root);
- mutex_unlock(&root->fs_info->tree_reloc_mutex);
-
/* do the directory inserts of any pending snapshot creations */
finish_pending_snapshots(trans, root->fs_info);
@@ -1186,16 +1060,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
put_transaction(cur_trans);
put_transaction(cur_trans);
- list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots);
- if (root->fs_info->closing)
- list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots);
-
mutex_unlock(&root->fs_info->trans_mutex);
kmem_cache_free(btrfs_trans_handle_cachep, trans);
-
- if (root->fs_info->closing)
- drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots);
return ret;
}
@@ -1204,16 +1071,17 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
*/
int btrfs_clean_old_snapshots(struct btrfs_root *root)
{
- struct list_head dirty_roots;
- INIT_LIST_HEAD(&dirty_roots);
-again:
- mutex_lock(&root->fs_info->trans_mutex);
- list_splice_init(&root->fs_info->dead_roots, &dirty_roots);
- mutex_unlock(&root->fs_info->trans_mutex);
+ LIST_HEAD(list);
+ struct btrfs_fs_info *fs_info = root->fs_info;
+
+ mutex_lock(&fs_info->trans_mutex);
+ list_splice_init(&fs_info->dead_roots, &list);
+ mutex_unlock(&fs_info->trans_mutex);
- if (!list_empty(&dirty_roots)) {
- drop_dirty_roots(root, &dirty_roots);
- goto again;
+ while (!list_empty(&list)) {
+ root = list_entry(list.next, struct btrfs_root, root_list);
+ list_del_init(&root->root_list);
+ btrfs_drop_dead_root(root);
}
return 0;
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-05 04:46:07 +0000