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Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c269
1 files changed, 109 insertions, 160 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 62176ad89846..8072cfa8a3b1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -33,7 +33,6 @@
#include <linux/uuid.h>
#include <linux/semaphore.h>
#include <asm/unaligned.h>
-#include "compat.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@@ -64,7 +63,6 @@ static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
struct btrfs_root *root);
-static void btrfs_evict_pending_snapshots(struct btrfs_transaction *t);
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
static int btrfs_destroy_marked_extents(struct btrfs_root *root,
struct extent_io_tree *dirty_pages,
@@ -477,14 +475,8 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
if (page != eb->pages[0])
return 0;
found_start = btrfs_header_bytenr(eb);
- if (found_start != start) {
- WARN_ON(1);
+ if (WARN_ON(found_start != start || !PageUptodate(page)))
return 0;
- }
- if (!PageUptodate(page)) {
- WARN_ON(1);
- return 0;
- }
csum_tree_block(root, eb, 0);
return 0;
}
@@ -496,7 +488,7 @@ static int check_tree_block_fsid(struct btrfs_root *root,
u8 fsid[BTRFS_UUID_SIZE];
int ret = 1;
- read_extent_buffer(eb, fsid, btrfs_header_fsid(eb), BTRFS_FSID_SIZE);
+ read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
while (fs_devices) {
if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
ret = 0;
@@ -1105,8 +1097,7 @@ struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
{
struct inode *btree_inode = root->fs_info->btree_inode;
struct extent_buffer *eb;
- eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
- bytenr, blocksize);
+ eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, bytenr);
return eb;
}
@@ -1229,14 +1220,18 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
atomic_set(&root->refs, 1);
root->log_transid = 0;
root->last_log_commit = 0;
- extent_io_tree_init(&root->dirty_log_pages,
- fs_info->btree_inode->i_mapping);
+ if (fs_info)
+ extent_io_tree_init(&root->dirty_log_pages,
+ fs_info->btree_inode->i_mapping);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
memset(&root->root_kobj, 0, sizeof(root->root_kobj));
- root->defrag_trans_start = fs_info->generation;
+ if (fs_info)
+ root->defrag_trans_start = fs_info->generation;
+ else
+ root->defrag_trans_start = 0;
init_completion(&root->kobj_unregister);
root->defrag_running = 0;
root->root_key.objectid = objectid;
@@ -1253,6 +1248,22 @@ static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
return root;
}
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+/* Should only be used by the testing infrastructure */
+struct btrfs_root *btrfs_alloc_dummy_root(void)
+{
+ struct btrfs_root *root;
+
+ root = btrfs_alloc_root(NULL);
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+ __setup_root(4096, 4096, 4096, 4096, root, NULL, 1);
+ root->dummy_root = 1;
+
+ return root;
+}
+#endif
+
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 objectid)
@@ -1292,7 +1303,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
btrfs_set_header_owner(leaf, objectid);
root->node = leaf;
- write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(leaf),
+ write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(),
BTRFS_FSID_SIZE);
write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
btrfs_header_chunk_tree_uuid(leaf),
@@ -1379,7 +1390,7 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
root->node = leaf;
write_extent_buffer(root->node, root->fs_info->fsid,
- btrfs_header_fsid(root->node), BTRFS_FSID_SIZE);
+ btrfs_header_fsid(), BTRFS_FSID_SIZE);
btrfs_mark_buffer_dirty(root->node);
btrfs_tree_unlock(root->node);
return root;
@@ -1780,6 +1791,9 @@ sleep:
wake_up_process(root->fs_info->cleaner_kthread);
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
+ if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
+ &root->fs_info->fs_state)))
+ btrfs_cleanup_transaction(root);
if (!try_to_freeze()) {
set_current_state(TASK_INTERRUPTIBLE);
if (!kthread_should_stop() &&
@@ -2013,50 +2027,28 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
btrfs_stop_workers(&fs_info->qgroup_rescan_workers);
}
+static void free_root_extent_buffers(struct btrfs_root *root)
+{
+ if (root) {
+ free_extent_buffer(root->node);
+ free_extent_buffer(root->commit_root);
+ root->node = NULL;
+ root->commit_root = NULL;
+ }
+}
+
/* helper to cleanup tree roots */
static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
{
- free_extent_buffer(info->tree_root->node);
- free_extent_buffer(info->tree_root->commit_root);
- info->tree_root->node = NULL;
- info->tree_root->commit_root = NULL;
-
- if (info->dev_root) {
- free_extent_buffer(info->dev_root->node);
- free_extent_buffer(info->dev_root->commit_root);
- info->dev_root->node = NULL;
- info->dev_root->commit_root = NULL;
- }
- if (info->extent_root) {
- free_extent_buffer(info->extent_root->node);
- free_extent_buffer(info->extent_root->commit_root);
- info->extent_root->node = NULL;
- info->extent_root->commit_root = NULL;
- }
- if (info->csum_root) {
- free_extent_buffer(info->csum_root->node);
- free_extent_buffer(info->csum_root->commit_root);
- info->csum_root->node = NULL;
- info->csum_root->commit_root = NULL;
- }
- if (info->quota_root) {
- free_extent_buffer(info->quota_root->node);
- free_extent_buffer(info->quota_root->commit_root);
- info->quota_root->node = NULL;
- info->quota_root->commit_root = NULL;
- }
- if (info->uuid_root) {
- free_extent_buffer(info->uuid_root->node);
- free_extent_buffer(info->uuid_root->commit_root);
- info->uuid_root->node = NULL;
- info->uuid_root->commit_root = NULL;
- }
- if (chunk_root) {
- free_extent_buffer(info->chunk_root->node);
- free_extent_buffer(info->chunk_root->commit_root);
- info->chunk_root->node = NULL;
- info->chunk_root->commit_root = NULL;
- }
+ free_root_extent_buffers(info->tree_root);
+
+ free_root_extent_buffers(info->dev_root);
+ free_root_extent_buffers(info->extent_root);
+ free_root_extent_buffers(info->csum_root);
+ free_root_extent_buffers(info->quota_root);
+ free_root_extent_buffers(info->uuid_root);
+ if (chunk_root)
+ free_root_extent_buffers(info->chunk_root);
}
static void del_fs_roots(struct btrfs_fs_info *fs_info)
@@ -2230,7 +2222,6 @@ int open_ctree(struct super_block *sb,
atomic_set(&fs_info->scrubs_paused, 0);
atomic_set(&fs_info->scrub_cancel_req, 0);
init_waitqueue_head(&fs_info->scrub_pause_wait);
- init_rwsem(&fs_info->scrub_super_lock);
fs_info->scrub_workers_refcnt = 0;
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
fs_info->check_integrity_print_mask = 0;
@@ -2272,7 +2263,7 @@ int open_ctree(struct super_block *sb,
sizeof(struct btrfs_key));
set_bit(BTRFS_INODE_DUMMY,
&BTRFS_I(fs_info->btree_inode)->runtime_flags);
- insert_inode_hash(fs_info->btree_inode);
+ btrfs_insert_inode_hash(fs_info->btree_inode);
spin_lock_init(&fs_info->block_group_cache_lock);
fs_info->block_group_cache_tree = RB_ROOT;
@@ -2670,6 +2661,7 @@ retry_root_backup:
btrfs_set_root_node(&tree_root->root_item, tree_root->node);
tree_root->commit_root = btrfs_root_node(tree_root);
+ btrfs_set_root_refs(&tree_root->root_item, 1);
location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
location.type = BTRFS_ROOT_ITEM_KEY;
@@ -3448,10 +3440,7 @@ static int write_all_supers(struct btrfs_root *root, int max_mirrors)
int write_ctree_super(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int max_mirrors)
{
- int ret;
-
- ret = write_all_supers(root, max_mirrors);
- return ret;
+ return write_all_supers(root, max_mirrors);
}
/* Drop a fs root from the radix tree and free it. */
@@ -3528,7 +3517,6 @@ int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
int btrfs_commit_super(struct btrfs_root *root)
{
struct btrfs_trans_handle *trans;
- int ret;
mutex_lock(&root->fs_info->cleaner_mutex);
btrfs_run_delayed_iputs(root);
@@ -3542,25 +3530,7 @@ int btrfs_commit_super(struct btrfs_root *root)
trans = btrfs_join_transaction(root);
if (IS_ERR(trans))
return PTR_ERR(trans);
- ret = btrfs_commit_transaction(trans, root);
- if (ret)
- return ret;
- /* run commit again to drop the original snapshot */
- trans = btrfs_join_transaction(root);
- if (IS_ERR(trans))
- return PTR_ERR(trans);
- ret = btrfs_commit_transaction(trans, root);
- if (ret)
- return ret;
- ret = btrfs_write_and_wait_transaction(NULL, root);
- if (ret) {
- btrfs_error(root->fs_info, ret,
- "Failed to sync btree inode to disk.");
- return ret;
- }
-
- ret = write_ctree_super(NULL, root, 0);
- return ret;
+ return btrfs_commit_transaction(trans, root);
}
int close_ctree(struct btrfs_root *root)
@@ -3614,12 +3584,12 @@ int close_ctree(struct btrfs_root *root)
percpu_counter_sum(&fs_info->delalloc_bytes));
}
+ del_fs_roots(fs_info);
+
btrfs_free_block_groups(fs_info);
btrfs_stop_all_workers(fs_info);
- del_fs_roots(fs_info);
-
free_root_pointers(fs_info, 1);
iput(fs_info->btree_inode);
@@ -3669,10 +3639,20 @@ int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
{
- struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
+ struct btrfs_root *root;
u64 transid = btrfs_header_generation(buf);
int was_dirty;
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+ /*
+ * This is a fast path so only do this check if we have sanity tests
+ * enabled. Normal people shouldn't be marking dummy buffers as dirty
+ * outside of the sanity tests.
+ */
+ if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags)))
+ return;
+#endif
+ root = BTRFS_I(buf->pages[0]->mapping->host)->root;
btrfs_assert_tree_locked(buf);
if (transid != root->fs_info->generation)
WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, "
@@ -3802,7 +3782,8 @@ static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
while (!list_empty(&splice)) {
root = list_first_entry(&splice, struct btrfs_root,
ordered_root);
- list_del_init(&root->ordered_root);
+ list_move_tail(&root->ordered_root,
+ &fs_info->ordered_roots);
btrfs_destroy_ordered_extents(root);
@@ -3880,24 +3861,6 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
return ret;
}
-static void btrfs_evict_pending_snapshots(struct btrfs_transaction *t)
-{
- struct btrfs_pending_snapshot *snapshot;
- struct list_head splice;
-
- INIT_LIST_HEAD(&splice);
-
- list_splice_init(&t->pending_snapshots, &splice);
-
- while (!list_empty(&splice)) {
- snapshot = list_entry(splice.next,
- struct btrfs_pending_snapshot,
- list);
- snapshot->error = -ECANCELED;
- list_del_init(&snapshot->list);
- }
-}
-
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
{
struct btrfs_inode *btrfs_inode;
@@ -4027,15 +3990,13 @@ again:
void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
struct btrfs_root *root)
{
+ btrfs_destroy_ordered_operations(cur_trans, root);
+
btrfs_destroy_delayed_refs(cur_trans, root);
- btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv,
- cur_trans->dirty_pages.dirty_bytes);
cur_trans->state = TRANS_STATE_COMMIT_START;
wake_up(&root->fs_info->transaction_blocked_wait);
- btrfs_evict_pending_snapshots(cur_trans);
-
cur_trans->state = TRANS_STATE_UNBLOCKED;
wake_up(&root->fs_info->transaction_wait);
@@ -4059,63 +4020,51 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
static int btrfs_cleanup_transaction(struct btrfs_root *root)
{
struct btrfs_transaction *t;
- LIST_HEAD(list);
mutex_lock(&root->fs_info->transaction_kthread_mutex);
spin_lock(&root->fs_info->trans_lock);
- list_splice_init(&root->fs_info->trans_list, &list);
- root->fs_info->running_transaction = NULL;
- spin_unlock(&root->fs_info->trans_lock);
-
- while (!list_empty(&list)) {
- t = list_entry(list.next, struct btrfs_transaction, list);
-
- btrfs_destroy_ordered_operations(t, root);
-
- btrfs_destroy_all_ordered_extents(root->fs_info);
-
- btrfs_destroy_delayed_refs(t, root);
-
- /*
- * FIXME: cleanup wait for commit
- * We needn't acquire the lock here, because we are during
- * the umount, there is no other task which will change it.
- */
- t->state = TRANS_STATE_COMMIT_START;
- smp_mb();
- if (waitqueue_active(&root->fs_info->transaction_blocked_wait))
- wake_up(&root->fs_info->transaction_blocked_wait);
-
- btrfs_evict_pending_snapshots(t);
-
- t->state = TRANS_STATE_UNBLOCKED;
- smp_mb();
- if (waitqueue_active(&root->fs_info->transaction_wait))
- wake_up(&root->fs_info->transaction_wait);
-
- btrfs_destroy_delayed_inodes(root);
- btrfs_assert_delayed_root_empty(root);
-
- btrfs_destroy_all_delalloc_inodes(root->fs_info);
-
- btrfs_destroy_marked_extents(root, &t->dirty_pages,
- EXTENT_DIRTY);
-
- btrfs_destroy_pinned_extent(root,
- root->fs_info->pinned_extents);
-
- t->state = TRANS_STATE_COMPLETED;
- smp_mb();
- if (waitqueue_active(&t->commit_wait))
- wake_up(&t->commit_wait);
+ while (!list_empty(&root->fs_info->trans_list)) {
+ t = list_first_entry(&root->fs_info->trans_list,
+ struct btrfs_transaction, list);
+ if (t->state >= TRANS_STATE_COMMIT_START) {
+ atomic_inc(&t->use_count);
+ spin_unlock(&root->fs_info->trans_lock);
+ btrfs_wait_for_commit(root, t->transid);
+ btrfs_put_transaction(t);
+ spin_lock(&root->fs_info->trans_lock);
+ continue;
+ }
+ if (t == root->fs_info->running_transaction) {
+ t->state = TRANS_STATE_COMMIT_DOING;
+ spin_unlock(&root->fs_info->trans_lock);
+ /*
+ * We wait for 0 num_writers since we don't hold a trans
+ * handle open currently for this transaction.
+ */
+ wait_event(t->writer_wait,
+ atomic_read(&t->num_writers) == 0);
+ } else {
+ spin_unlock(&root->fs_info->trans_lock);
+ }
+ btrfs_cleanup_one_transaction(t, root);
- atomic_set(&t->use_count, 0);
+ spin_lock(&root->fs_info->trans_lock);
+ if (t == root->fs_info->running_transaction)
+ root->fs_info->running_transaction = NULL;
list_del_init(&t->list);
- memset(t, 0, sizeof(*t));
- kmem_cache_free(btrfs_transaction_cachep, t);
- }
+ spin_unlock(&root->fs_info->trans_lock);
+ btrfs_put_transaction(t);
+ trace_btrfs_transaction_commit(root);
+ spin_lock(&root->fs_info->trans_lock);
+ }
+ spin_unlock(&root->fs_info->trans_lock);
+ btrfs_destroy_all_ordered_extents(root->fs_info);
+ btrfs_destroy_delayed_inodes(root);
+ btrfs_assert_delayed_root_empty(root);
+ btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents);
+ btrfs_destroy_all_delalloc_inodes(root->fs_info);
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
return 0;