static struct extent_io_ops btree_extent_io_ops;
static void end_workqueue_fn(struct btrfs_work *work);
static void free_fs_root(struct btrfs_root *root);
+static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
+ int read_only);
+static int btrfs_destroy_ordered_operations(struct btrfs_root *root);
+static int btrfs_destroy_ordered_extents(struct btrfs_root *root);
+static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
+ struct btrfs_root *root);
+static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t);
+static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
+static int btrfs_destroy_marked_extents(struct btrfs_root *root,
+ struct extent_io_tree *dirty_pages,
+ int mark);
+static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
+ struct extent_io_tree *pinned_extents);
+static int btrfs_cleanup_transaction(struct btrfs_root *root);
/*
* end_io_wq structs are used to do processing in task context when an IO is
WARN_ON(len == 0);
eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
+ if (eb == NULL) {
+ WARN_ON(1);
+ goto out;
+ }
ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
btrfs_header_generation(eb));
BUG_ON(ret);
WARN_ON(len == 0);
eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
+ if (eb == NULL) {
+ ret = -EIO;
+ goto out;
+ }
found_start = btrfs_header_bytenr(eb);
if (found_start != start) {
}
btrfs_free_path(path);
if (ret) {
+ kfree(root);
if (ret > 0)
ret = -ENOENT;
return ERR_PTR(ret);
spin_unlock(&root->fs_info->new_trans_lock);
trans = btrfs_join_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
if (transid == trans->transid) {
ret = btrfs_commit_transaction(trans, root);
BUG_ON(ret);
fs_info, BTRFS_ROOT_TREE_OBJECTID);
bh = btrfs_read_dev_super(fs_devices->latest_bdev);
- if (!bh)
+ if (!bh) {
+ err = -EINVAL;
goto fail_iput;
+ }
memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
if (!btrfs_super_root(disk_super))
goto fail_iput;
+ /* check FS state, whether FS is broken. */
+ fs_info->fs_state |= btrfs_super_flags(disk_super);
+
+ btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
+
ret = btrfs_parse_options(tree_root, options);
if (ret) {
err = ret;
}
features = btrfs_super_incompat_flags(disk_super);
- if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
- features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
- btrfs_set_super_incompat_flags(disk_super, features);
- }
+ features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
+ if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO)
+ features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
+ btrfs_set_super_incompat_flags(disk_super, features);
features = btrfs_super_compat_ro_flags(disk_super) &
~BTRFS_FEATURE_COMPAT_RO_SUPP;
btrfs_set_opt(fs_info->mount_opt, SSD);
}
- if (btrfs_super_log_root(disk_super) != 0) {
+ /* do not make disk changes in broken FS */
+ if (btrfs_super_log_root(disk_super) != 0 &&
+ !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) {
u64 bytenr = btrfs_super_log_root(disk_super);
if (fs_devices->rw_devices == 0) {
up_write(&root->fs_info->cleanup_work_sem);
trans = btrfs_join_transaction(root, 1);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
ret = btrfs_commit_transaction(trans, root);
BUG_ON(ret);
/* run commit again to drop the original snapshot */
trans = btrfs_join_transaction(root, 1);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
btrfs_commit_transaction(trans, root);
ret = btrfs_write_and_wait_transaction(NULL, root);
BUG_ON(ret);
smp_mb();
btrfs_put_block_group_cache(fs_info);
+
+ /*
+ * Here come 2 situations when btrfs is broken to flip readonly:
+ *
+ * 1. when btrfs flips readonly somewhere else before
+ * btrfs_commit_super, sb->s_flags has MS_RDONLY flag,
+ * and btrfs will skip to write sb directly to keep
+ * ERROR state on disk.
+ *
+ * 2. when btrfs flips readonly just in btrfs_commit_super,
+ * and in such case, btrfs cannnot write sb via btrfs_commit_super,
+ * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag,
+ * btrfs will cleanup all FS resources first and write sb then.
+ */
if (!(fs_info->sb->s_flags & MS_RDONLY)) {
- ret = btrfs_commit_super(root);
+ ret = btrfs_commit_super(root);
+ if (ret)
+ printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
+ }
+
+ if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
+ ret = btrfs_error_commit_super(root);
if (ret)
printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
}
kfree(fs_info->chunk_root);
kfree(fs_info->dev_root);
kfree(fs_info->csum_root);
+ kfree(fs_info);
+
return 0;
}
return 0;
}
+static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
+ int read_only)
+{
+ if (read_only)
+ return;
+
+ if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
+ printk(KERN_WARNING "warning: mount fs with errors, "
+ "running btrfsck is recommended\n");
+}
+
+int btrfs_error_commit_super(struct btrfs_root *root)
+{
+ int ret;
+
+ mutex_lock(&root->fs_info->cleaner_mutex);
+ btrfs_run_delayed_iputs(root);
+ mutex_unlock(&root->fs_info->cleaner_mutex);
+
+ down_write(&root->fs_info->cleanup_work_sem);
+ up_write(&root->fs_info->cleanup_work_sem);
+
+ /* cleanup FS via transaction */
+ btrfs_cleanup_transaction(root);
+
+ ret = write_ctree_super(NULL, root, 0);
+
+ return ret;
+}
+
+static int btrfs_destroy_ordered_operations(struct btrfs_root *root)
+{
+ struct btrfs_inode *btrfs_inode;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ mutex_lock(&root->fs_info->ordered_operations_mutex);
+ spin_lock(&root->fs_info->ordered_extent_lock);
+
+ list_splice_init(&root->fs_info->ordered_operations, &splice);
+ while (!list_empty(&splice)) {
+ btrfs_inode = list_entry(splice.next, struct btrfs_inode,
+ ordered_operations);
+
+ list_del_init(&btrfs_inode->ordered_operations);
+
+ btrfs_invalidate_inodes(btrfs_inode->root);
+ }
+
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+ mutex_unlock(&root->fs_info->ordered_operations_mutex);
+
+ return 0;
+}
+
+static int btrfs_destroy_ordered_extents(struct btrfs_root *root)
+{
+ struct list_head splice;
+ struct btrfs_ordered_extent *ordered;
+ struct inode *inode;
+
+ INIT_LIST_HEAD(&splice);
+
+ spin_lock(&root->fs_info->ordered_extent_lock);
+
+ list_splice_init(&root->fs_info->ordered_extents, &splice);
+ while (!list_empty(&splice)) {
+ ordered = list_entry(splice.next, struct btrfs_ordered_extent,
+ root_extent_list);
+
+ list_del_init(&ordered->root_extent_list);
+ atomic_inc(&ordered->refs);
+
+ /* the inode may be getting freed (in sys_unlink path). */
+ inode = igrab(ordered->inode);
+
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+ if (inode)
+ iput(inode);
+
+ atomic_set(&ordered->refs, 1);
+ btrfs_put_ordered_extent(ordered);
+
+ spin_lock(&root->fs_info->ordered_extent_lock);
+ }
+
+ spin_unlock(&root->fs_info->ordered_extent_lock);
+
+ return 0;
+}
+
+static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
+ struct btrfs_root *root)
+{
+ struct rb_node *node;
+ struct btrfs_delayed_ref_root *delayed_refs;
+ struct btrfs_delayed_ref_node *ref;
+ int ret = 0;
+
+ delayed_refs = &trans->delayed_refs;
+
+ spin_lock(&delayed_refs->lock);
+ if (delayed_refs->num_entries == 0) {
+ printk(KERN_INFO "delayed_refs has NO entry\n");
+ return ret;
+ }
+
+ node = rb_first(&delayed_refs->root);
+ while (node) {
+ ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
+ node = rb_next(node);
+
+ ref->in_tree = 0;
+ rb_erase(&ref->rb_node, &delayed_refs->root);
+ delayed_refs->num_entries--;
+
+ atomic_set(&ref->refs, 1);
+ if (btrfs_delayed_ref_is_head(ref)) {
+ struct btrfs_delayed_ref_head *head;
+
+ head = btrfs_delayed_node_to_head(ref);
+ mutex_lock(&head->mutex);
+ kfree(head->extent_op);
+ delayed_refs->num_heads--;
+ if (list_empty(&head->cluster))
+ delayed_refs->num_heads_ready--;
+ list_del_init(&head->cluster);
+ mutex_unlock(&head->mutex);
+ }
+
+ spin_unlock(&delayed_refs->lock);
+ btrfs_put_delayed_ref(ref);
+
+ cond_resched();
+ spin_lock(&delayed_refs->lock);
+ }
+
+ spin_unlock(&delayed_refs->lock);
+
+ return ret;
+}
+
+static int btrfs_destroy_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);
+
+ list_del_init(&snapshot->list);
+
+ kfree(snapshot);
+ }
+
+ return 0;
+}
+
+static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
+{
+ struct btrfs_inode *btrfs_inode;
+ struct list_head splice;
+
+ INIT_LIST_HEAD(&splice);
+
+ list_splice_init(&root->fs_info->delalloc_inodes, &splice);
+
+ spin_lock(&root->fs_info->delalloc_lock);
+
+ while (!list_empty(&splice)) {
+ btrfs_inode = list_entry(splice.next, struct btrfs_inode,
+ delalloc_inodes);
+
+ list_del_init(&btrfs_inode->delalloc_inodes);
+
+ btrfs_invalidate_inodes(btrfs_inode->root);
+ }
+
+ spin_unlock(&root->fs_info->delalloc_lock);
+
+ return 0;
+}
+
+static int btrfs_destroy_marked_extents(struct btrfs_root *root,
+ struct extent_io_tree *dirty_pages,
+ int mark)
+{
+ int ret;
+ struct page *page;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ struct extent_buffer *eb;
+ u64 start = 0;
+ u64 end;
+ u64 offset;
+ unsigned long index;
+
+ while (1) {
+ ret = find_first_extent_bit(dirty_pages, start, &start, &end,
+ mark);
+ if (ret)
+ break;
+
+ clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
+ while (start <= end) {
+ index = start >> PAGE_CACHE_SHIFT;
+ start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
+ page = find_get_page(btree_inode->i_mapping, index);
+ if (!page)
+ continue;
+ offset = page_offset(page);
+
+ spin_lock(&dirty_pages->buffer_lock);
+ eb = radix_tree_lookup(
+ &(&BTRFS_I(page->mapping->host)->io_tree)->buffer,
+ offset >> PAGE_CACHE_SHIFT);
+ spin_unlock(&dirty_pages->buffer_lock);
+ if (eb) {
+ ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY,
+ &eb->bflags);
+ atomic_set(&eb->refs, 1);
+ }
+ if (PageWriteback(page))
+ end_page_writeback(page);
+
+ lock_page(page);
+ if (PageDirty(page)) {
+ clear_page_dirty_for_io(page);
+ spin_lock_irq(&page->mapping->tree_lock);
+ radix_tree_tag_clear(&page->mapping->page_tree,
+ page_index(page),
+ PAGECACHE_TAG_DIRTY);
+ spin_unlock_irq(&page->mapping->tree_lock);
+ }
+
+ page->mapping->a_ops->invalidatepage(page, 0);
+ unlock_page(page);
+ }
+ }
+
+ return ret;
+}
+
+static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
+ struct extent_io_tree *pinned_extents)
+{
+ struct extent_io_tree *unpin;
+ u64 start;
+ u64 end;
+ int ret;
+
+ unpin = pinned_extents;
+ while (1) {
+ ret = find_first_extent_bit(unpin, 0, &start, &end,
+ EXTENT_DIRTY);
+ if (ret)
+ break;
+
+ /* opt_discard */
+ ret = btrfs_error_discard_extent(root, start, end + 1 - start);
+
+ clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ btrfs_error_unpin_extent_range(root, start, end);
+ cond_resched();
+ }
+
+ return 0;
+}
+
+static int btrfs_cleanup_transaction(struct btrfs_root *root)
+{
+ struct btrfs_transaction *t;
+ LIST_HEAD(list);
+
+ WARN_ON(1);
+
+ mutex_lock(&root->fs_info->trans_mutex);
+ mutex_lock(&root->fs_info->transaction_kthread_mutex);
+
+ list_splice_init(&root->fs_info->trans_list, &list);
+ while (!list_empty(&list)) {
+ t = list_entry(list.next, struct btrfs_transaction, list);
+ if (!t)
+ break;
+
+ btrfs_destroy_ordered_operations(root);
+
+ btrfs_destroy_ordered_extents(root);
+
+ btrfs_destroy_delayed_refs(t, root);
+
+ btrfs_block_rsv_release(root,
+ &root->fs_info->trans_block_rsv,
+ t->dirty_pages.dirty_bytes);
+
+ /* FIXME: cleanup wait for commit */
+ t->in_commit = 1;
+ t->blocked = 1;
+ if (waitqueue_active(&root->fs_info->transaction_blocked_wait))
+ wake_up(&root->fs_info->transaction_blocked_wait);
+
+ t->blocked = 0;
+ if (waitqueue_active(&root->fs_info->transaction_wait))
+ wake_up(&root->fs_info->transaction_wait);
+ mutex_unlock(&root->fs_info->trans_mutex);
+
+ mutex_lock(&root->fs_info->trans_mutex);
+ t->commit_done = 1;
+ if (waitqueue_active(&t->commit_wait))
+ wake_up(&t->commit_wait);
+ mutex_unlock(&root->fs_info->trans_mutex);
+
+ mutex_lock(&root->fs_info->trans_mutex);
+
+ btrfs_destroy_pending_snapshots(t);
+
+ btrfs_destroy_delalloc_inodes(root);
+
+ spin_lock(&root->fs_info->new_trans_lock);
+ root->fs_info->running_transaction = NULL;
+ spin_unlock(&root->fs_info->new_trans_lock);
+
+ btrfs_destroy_marked_extents(root, &t->dirty_pages,
+ EXTENT_DIRTY);
+
+ btrfs_destroy_pinned_extent(root,
+ root->fs_info->pinned_extents);
+
+ t->use_count = 0;
+ list_del_init(&t->list);
+ memset(t, 0, sizeof(*t));
+ kmem_cache_free(btrfs_transaction_cachep, t);
+ }
+
+ mutex_unlock(&root->fs_info->transaction_kthread_mutex);
+ mutex_unlock(&root->fs_info->trans_mutex);
+
+ return 0;
+}
+
static struct extent_io_ops btree_extent_io_ops = {
.write_cache_pages_lock_hook = btree_lock_page_hook,
.readpage_end_io_hook = btree_readpage_end_io_hook,
git.openpandora.org / pandora-kernel.git / blobdiff