From patchwork Mon Apr 19 10:46:23 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yan, Zheng" X-Patchwork-Id: 93472 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o3JAlnkc000583 for ; Mon, 19 Apr 2010 10:47:49 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753968Ab0DSKrr (ORCPT ); Mon, 19 Apr 2010 06:47:47 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:28198 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753899Ab0DSKrq (ORCPT ); Mon, 19 Apr 2010 06:47:46 -0400 Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by rcsinet10.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o3JAlWjp003522 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 19 Apr 2010 10:47:36 GMT Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o3J6xALO006543 for ; Mon, 19 Apr 2010 10:47:30 GMT Received: from abhmt001.oracle.com by acsmt353.oracle.com with ESMTP id 186993041271673990; Mon, 19 Apr 2010 03:46:30 -0700 Received: from [141.144.144.227] (/141.144.144.227) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 19 Apr 2010 03:46:27 -0700 Message-ID: <4BCC347F.7010103@oracle.com> Date: Mon, 19 Apr 2010 18:46:23 +0800 From: "Yan, Zheng" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 MIME-Version: 1.0 To: linux-btrfs@vger.kernel.org Subject: [PATCH 05/12] Btrfs: Introduce contexts for metadata reseravtion X-Auth-Type: Internal IP X-Source-IP: acsinet15.oracle.com [141.146.126.227] X-CT-RefId: str=0001.0A090204.4BCC34CF.0034:SCFMA922111, ss=1, pt=DBB_66871, fgs=0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Mon, 19 Apr 2010 10:47:49 +0000 (UTC) diff -urp 5/fs/btrfs/ctree.c 6/fs/btrfs/ctree.c --- 5/fs/btrfs/ctree.c 2010-04-14 14:49:56.342950000 +0800 +++ 6/fs/btrfs/ctree.c 2010-04-18 10:22:08.215948795 +0800 @@ -279,7 +279,8 @@ int btrfs_block_can_be_shared(struct btr static noinline int update_ref_for_cow(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct extent_buffer *buf, - struct extent_buffer *cow) + struct extent_buffer *cow, + int *last_ref) { u64 refs; u64 owner; @@ -365,6 +366,7 @@ static noinline int update_ref_for_cow(s BUG_ON(ret); } clean_tree_block(trans, root, buf); + *last_ref = 1; } return 0; } @@ -391,6 +393,7 @@ static noinline int __btrfs_cow_block(st struct btrfs_disk_key disk_key; struct extent_buffer *cow; int level; + int last_ref = 0; int unlock_orig = 0; u64 parent_start; @@ -441,7 +444,7 @@ static noinline int __btrfs_cow_block(st (unsigned long)btrfs_header_fsid(cow), BTRFS_FSID_SIZE); - update_ref_for_cow(trans, root, buf, cow); + update_ref_for_cow(trans, root, buf, cow, &last_ref); if (buf == root->node) { WARN_ON(parent && parent != buf); @@ -456,8 +459,8 @@ static noinline int __btrfs_cow_block(st extent_buffer_get(cow); spin_unlock(&root->node_lock); - btrfs_free_tree_block(trans, root, buf->start, buf->len, - parent_start, root->root_key.objectid, level); + btrfs_free_tree_block(trans, root, buf, parent_start, + last_ref); free_extent_buffer(buf); add_root_to_dirty_list(root); } else { @@ -472,8 +475,8 @@ static noinline int __btrfs_cow_block(st btrfs_set_node_ptr_generation(parent, parent_slot, trans->transid); btrfs_mark_buffer_dirty(parent); - btrfs_free_tree_block(trans, root, buf->start, buf->len, - parent_start, root->root_key.objectid, level); + btrfs_free_tree_block(trans, root, buf, parent_start, + last_ref); } if (unlock_orig) btrfs_tree_unlock(buf); @@ -948,6 +951,22 @@ int btrfs_bin_search(struct extent_buffe return bin_search(eb, key, level, slot); } +static void root_add_used(struct btrfs_root *root, u32 size) +{ + spin_lock(&root->accounting_lock); + btrfs_set_root_used(&root->root_item, + btrfs_root_used(&root->root_item) + size); + spin_unlock(&root->accounting_lock); +} + +static void root_sub_used(struct btrfs_root *root, u32 size) +{ + spin_lock(&root->accounting_lock); + btrfs_set_root_used(&root->root_item, + btrfs_root_used(&root->root_item) - size); + spin_unlock(&root->accounting_lock); +} + /* given a node and slot number, this reads the blocks it points to. The * extent buffer is returned with a reference taken (but unlocked). * NULL is returned on error. @@ -1018,7 +1037,11 @@ static noinline int balance_level(struct btrfs_tree_lock(child); btrfs_set_lock_blocking(child); ret = btrfs_cow_block(trans, root, child, mid, 0, &child); - BUG_ON(ret); + if (ret) { + btrfs_tree_unlock(child); + free_extent_buffer(child); + goto enospc; + } spin_lock(&root->node_lock); root->node = child; @@ -1033,11 +1056,12 @@ static noinline int balance_level(struct btrfs_tree_unlock(mid); /* once for the path */ free_extent_buffer(mid); - ret = btrfs_free_tree_block(trans, root, mid->start, mid->len, - 0, root->root_key.objectid, level); + + root_sub_used(root, mid->len); + btrfs_free_tree_block(trans, root, mid, 0, 1); /* once for the root ptr */ free_extent_buffer(mid); - return ret; + return 0; } if (btrfs_header_nritems(mid) > BTRFS_NODEPTRS_PER_BLOCK(root) / 4) @@ -1087,23 +1111,16 @@ static noinline int balance_level(struct if (wret < 0 && wret != -ENOSPC) ret = wret; if (btrfs_header_nritems(right) == 0) { - u64 bytenr = right->start; - u32 blocksize = right->len; - clean_tree_block(trans, root, right); btrfs_tree_unlock(right); - free_extent_buffer(right); - right = NULL; wret = del_ptr(trans, root, path, level + 1, pslot + 1); if (wret) ret = wret; - wret = btrfs_free_tree_block(trans, root, - bytenr, blocksize, 0, - root->root_key.objectid, - level); - if (wret) - ret = wret; + root_sub_used(root, right->len); + btrfs_free_tree_block(trans, root, right, 0, 1); + free_extent_buffer(right); + right = NULL; } else { struct btrfs_disk_key right_key; btrfs_node_key(right, &right_key, 0); @@ -1135,21 +1152,15 @@ static noinline int balance_level(struct BUG_ON(wret == 1); } if (btrfs_header_nritems(mid) == 0) { - /* we've managed to empty the middle node, drop it */ - u64 bytenr = mid->start; - u32 blocksize = mid->len; - clean_tree_block(trans, root, mid); btrfs_tree_unlock(mid); - free_extent_buffer(mid); - mid = NULL; wret = del_ptr(trans, root, path, level + 1, pslot); if (wret) ret = wret; - wret = btrfs_free_tree_block(trans, root, bytenr, blocksize, - 0, root->root_key.objectid, level); - if (wret) - ret = wret; + root_sub_used(root, mid->len); + btrfs_free_tree_block(trans, root, mid, 0, 1); + free_extent_buffer(mid); + mid = NULL; } else { /* update the parent key to reflect our changes */ struct btrfs_disk_key mid_key; @@ -1739,7 +1750,6 @@ again: p->nodes[level + 1], p->slots[level + 1], &b); if (err) { - free_extent_buffer(b); ret = err; goto done; } @@ -2075,6 +2085,8 @@ static noinline int insert_new_root(stru if (IS_ERR(c)) return PTR_ERR(c); + root_add_used(root, root->nodesize); + memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header)); btrfs_set_header_nritems(c, 1); btrfs_set_header_level(c, level); @@ -2133,6 +2145,7 @@ static int insert_ptr(struct btrfs_trans int nritems; BUG_ON(!path->nodes[level]); + btrfs_assert_tree_locked(path->nodes[level]); lower = path->nodes[level]; nritems = btrfs_header_nritems(lower); BUG_ON(slot > nritems); @@ -2201,6 +2214,8 @@ static noinline int split_node(struct bt if (IS_ERR(split)) return PTR_ERR(split); + root_add_used(root, root->nodesize); + memset_extent_buffer(split, 0, 0, sizeof(struct btrfs_header)); btrfs_set_header_level(split, btrfs_header_level(c)); btrfs_set_header_bytenr(split, split->start); @@ -2414,6 +2429,9 @@ static noinline int __push_leaf_right(st if (left_nritems) btrfs_mark_buffer_dirty(left); + else + clean_tree_block(trans, root, left); + btrfs_mark_buffer_dirty(right); btrfs_item_key(right, &disk_key, 0); @@ -2659,6 +2677,8 @@ static noinline int __push_leaf_left(str btrfs_mark_buffer_dirty(left); if (right_nritems) btrfs_mark_buffer_dirty(right); + else + clean_tree_block(trans, root, right); btrfs_item_key(right, &disk_key, 0); wret = fixup_low_keys(trans, root, path, &disk_key, 1); @@ -2668,8 +2688,6 @@ static noinline int __push_leaf_left(str /* then fixup the leaf pointer in the path */ if (path->slots[0] < push_items) { path->slots[0] += old_left_nritems; - if (btrfs_header_nritems(path->nodes[0]) == 0) - clean_tree_block(trans, root, path->nodes[0]); btrfs_tree_unlock(path->nodes[0]); free_extent_buffer(path->nodes[0]); path->nodes[0] = left; @@ -2931,10 +2949,10 @@ again: right = btrfs_alloc_free_block(trans, root, root->leafsize, 0, root->root_key.objectid, &disk_key, 0, l->start, 0); - if (IS_ERR(right)) { - BUG_ON(1); + if (IS_ERR(right)) return PTR_ERR(right); - } + + root_add_used(root, root->leafsize); memset_extent_buffer(right, 0, 0, sizeof(struct btrfs_header)); btrfs_set_header_bytenr(right, right->start); @@ -3053,7 +3071,8 @@ static noinline int setup_leaf_for_split btrfs_set_path_blocking(path); ret = split_leaf(trans, root, &key, path, ins_len, 1); - BUG_ON(ret); + if (ret) + goto err; path->keep_locks = 0; btrfs_unlock_up_safe(path, 1); @@ -3795,9 +3814,10 @@ static noinline int btrfs_del_leaf(struc */ btrfs_unlock_up_safe(path, 0); - ret = btrfs_free_tree_block(trans, root, leaf->start, leaf->len, - 0, root->root_key.objectid, 0); - return ret; + root_sub_used(root, leaf->len); + + btrfs_free_tree_block(trans, root, leaf, 0, 1); + return 0; } /* * delete the item at the leaf level in path. If that empties @@ -3864,6 +3884,8 @@ int btrfs_del_items(struct btrfs_trans_h if (leaf == root->node) { btrfs_set_header_level(leaf, 0); } else { + btrfs_set_path_blocking(path); + clean_tree_block(trans, root, leaf); ret = btrfs_del_leaf(trans, root, path, leaf); BUG_ON(ret); } diff -urp 5/fs/btrfs/ctree.h 6/fs/btrfs/ctree.h --- 5/fs/btrfs/ctree.h 2010-04-18 08:13:51.602699000 +0800 +++ 6/fs/btrfs/ctree.h 2010-04-18 10:22:08.217949152 +0800 @@ -706,6 +706,19 @@ struct btrfs_space_info { atomic_t caching_threads; }; +struct btrfs_block_rsv { + u64 size; + u64 reserved; + u64 freed[2]; + struct btrfs_space_info *space_info; + struct list_head list; + spinlock_t lock; + atomic_t usage; + unsigned int priority:8; + unsigned int durable:1; + unsigned int refill_used:1; +}; + /* * free clusters are used to claim free space in relatively large chunks, * allowing us to do less seeky writes. They are used for all metadata @@ -756,6 +769,7 @@ struct btrfs_block_group_cache { spinlock_t lock; u64 pinned; u64 reserved; + u64 reserved_pinned; u64 bytes_super; u64 flags; u64 sectorsize; @@ -821,6 +835,22 @@ struct btrfs_fs_info { /* logical->physical extent mapping */ struct btrfs_mapping_tree mapping_tree; + /* block reservation for extent, checksum and root tree */ + struct btrfs_block_rsv global_block_rsv; + /* block reservation for delay allocation */ + struct btrfs_block_rsv delalloc_block_rsv; + /* block reservation for metadata operations */ + struct btrfs_block_rsv trans_block_rsv; + /* block reservation for chunk tree */ + struct btrfs_block_rsv chunk_block_rsv; + + struct btrfs_block_rsv empty_block_rsv; + + /* list of block reservations that cross multiple transactions */ + struct list_head durable_block_rsv_list; + + struct mutex durable_block_rsv_mutex; + u64 generation; u64 last_trans_committed; @@ -1007,6 +1037,9 @@ struct btrfs_root { struct completion kobj_unregister; struct mutex objectid_mutex; + spinlock_t accounting_lock; + struct btrfs_block_rsv *block_rsv; + struct mutex log_mutex; wait_queue_head_t log_writer_wait; wait_queue_head_t log_commit_wait[2]; @@ -1979,10 +2012,10 @@ struct extent_buffer *btrfs_alloc_free_b u64 parent, u64 root_objectid, struct btrfs_disk_key *key, int level, u64 hint, u64 empty_size); -int btrfs_free_tree_block(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 bytenr, u32 blocksize, - u64 parent, u64 root_objectid, int level); +void btrfs_free_tree_block(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct extent_buffer *buf, + u64 parent, int last_ref); struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 bytenr, u32 blocksize, @@ -2036,9 +2069,6 @@ int btrfs_make_block_group(struct btrfs_ u64 size); int btrfs_remove_block_group(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 group_start); -int btrfs_prepare_block_group_relocation(struct btrfs_root *root, - struct btrfs_block_group_cache *group); - u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); void btrfs_clear_space_info_full(struct btrfs_fs_info *info); @@ -2057,6 +2087,28 @@ void btrfs_delalloc_reserve_space(struct u64 bytes); void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, u64 bytes); +void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv); +struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root); +void btrfs_free_block_rsv(struct btrfs_block_rsv *rsv); +void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *rsv); +int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_block_rsv *block_rsv, + u64 num_bytes, int *retries); +int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_block_rsv *block_rsv, + u64 min_reserved, int min_factor); +int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, + struct btrfs_block_rsv *dst_rsv, + u64 num_bytes); +void btrfs_block_rsv_release(struct btrfs_block_rsv *block_rsv, + u64 num_bytes); +int btrfs_set_block_group_ro(struct btrfs_root *root, + struct btrfs_block_group_cache *cache); +int btrfs_set_block_group_rw(struct btrfs_root *root, + struct btrfs_block_group_cache *cache); /* ctree.c */ int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, int level, int *slot); diff -urp 5/fs/btrfs/disk-io.c 6/fs/btrfs/disk-io.c --- 5/fs/btrfs/disk-io.c 2010-04-18 08:13:51.604699000 +0800 +++ 6/fs/btrfs/disk-io.c 2010-04-18 10:24:01.746697947 +0800 @@ -904,6 +904,7 @@ static int __setup_root(u32 nodesize, u3 root->name = NULL; root->in_sysfs = 0; root->inode_tree = RB_ROOT; + root->block_rsv = NULL; INIT_LIST_HEAD(&root->dirty_list); INIT_LIST_HEAD(&root->orphan_list); @@ -911,6 +912,7 @@ static int __setup_root(u32 nodesize, u3 spin_lock_init(&root->node_lock); spin_lock_init(&root->list_lock); spin_lock_init(&root->inode_lock); + spin_lock_init(&root->accounting_lock); mutex_init(&root->objectid_mutex); mutex_init(&root->log_mutex); init_waitqueue_head(&root->log_writer_wait); @@ -1629,6 +1631,13 @@ struct btrfs_root *open_ctree(struct sup INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); INIT_LIST_HEAD(&fs_info->space_info); btrfs_mapping_init(&fs_info->mapping_tree); + btrfs_init_block_rsv(&fs_info->global_block_rsv); + btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); + btrfs_init_block_rsv(&fs_info->trans_block_rsv); + btrfs_init_block_rsv(&fs_info->chunk_block_rsv); + btrfs_init_block_rsv(&fs_info->empty_block_rsv); + INIT_LIST_HEAD(&fs_info->durable_block_rsv_list); + mutex_init(&fs_info->durable_block_rsv_mutex); atomic_set(&fs_info->nr_async_submits, 0); atomic_set(&fs_info->async_delalloc_pages, 0); atomic_set(&fs_info->async_submit_draining, 0); diff -urp 5/fs/btrfs/extent-tree.c 6/fs/btrfs/extent-tree.c --- 5/fs/btrfs/extent-tree.c 2010-04-18 08:13:51.608702000 +0800 +++ 6/fs/btrfs/extent-tree.c 2010-04-18 11:29:11.225697226 +0800 @@ -34,10 +34,9 @@ static int update_block_group(struct btrfs_trans_handle *trans, struct btrfs_root *root, - u64 bytenr, u64 num_bytes, int alloc, - int mark_free); -static int update_reserved_extents(struct btrfs_block_group_cache *cache, - u64 num_bytes, int reserve); + u64 bytenr, u64 num_bytes, int alloc); +static int update_reserved_bytes(struct btrfs_block_group_cache *cache, + u64 num_bytes, int reserve, int sinfo); static int __btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 bytenr, u64 num_bytes, u64 parent, @@ -60,12 +59,6 @@ static int alloc_reserved_tree_block(str static int do_chunk_alloc(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root, u64 alloc_bytes, u64 flags, int force); -static int pin_down_bytes(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, - u64 bytenr, u64 num_bytes, - int is_data, int reserved, - struct extent_buffer **must_clean); static int find_next_key(struct btrfs_path *path, int level, struct btrfs_key *key); static void dump_space_info(struct btrfs_space_info *info, u64 bytes, @@ -96,8 +89,12 @@ void btrfs_get_block_group(struct btrfs_ void btrfs_put_block_group(struct btrfs_block_group_cache *cache) { - if (atomic_dec_and_test(&cache->count)) + if (atomic_dec_and_test(&cache->count)) { + WARN_ON(cache->pinned > 0); + WARN_ON(cache->reserved > 0); + WARN_ON(cache->reserved_pinned > 0); kfree(cache); + } } /* @@ -324,7 +321,7 @@ static int caching_kthread(void *data) exclude_super_stripes(extent_root, block_group); spin_lock(&block_group->space_info->lock); - block_group->space_info->bytes_super += block_group->bytes_super; + block_group->space_info->bytes_readonly += block_group->bytes_super; spin_unlock(&block_group->space_info->lock); last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); @@ -1876,7 +1876,6 @@ static int run_delayed_tree_ref(struct b return ret; } - /* helper function to actually process a single delayed ref entry */ static int run_one_delayed_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, @@ -1896,32 +1895,14 @@ static int run_one_delayed_ref(struct bt BUG_ON(extent_op); head = btrfs_delayed_node_to_head(node); if (insert_reserved) { - int mark_free = 0; - struct extent_buffer *must_clean = NULL; - - ret = pin_down_bytes(trans, root, NULL, - node->bytenr, node->num_bytes, - head->is_data, 1, &must_clean); - if (ret > 0) - mark_free = 1; - - if (must_clean) { - clean_tree_block(NULL, root, must_clean); - btrfs_tree_unlock(must_clean); - free_extent_buffer(must_clean); - } + btrfs_pin_extent(root, node->bytenr, + node->num_bytes, 1); if (head->is_data) { ret = btrfs_del_csums(trans, root, node->bytenr, node->num_bytes); BUG_ON(ret); } - if (mark_free) { - ret = btrfs_free_reserved_extent(root, - node->bytenr, - node->num_bytes); - BUG_ON(ret); - } } mutex_unlock(&head->mutex); return 0; @@ -2352,6 +2333,8 @@ int btrfs_cross_ref_exist(struct btrfs_t ret = 0; out: btrfs_free_path(path); + if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) + WARN_ON(ret > 0); return ret; } @@ -2702,7 +2685,7 @@ static int update_space_info(struct btrf found->bytes_pinned = 0; found->bytes_reserved = 0; found->bytes_readonly = 0; - found->bytes_delalloc = 0; + found->bytes_may_use = 0; found->full = 0; found->force_alloc = 0; *space_info = found; @@ -2727,19 +2710,6 @@ static void set_avail_alloc_bits(struct } } -static void set_block_group_readonly(struct btrfs_block_group_cache *cache) -{ - spin_lock(&cache->space_info->lock); - spin_lock(&cache->lock); - if (!cache->ro) { - cache->space_info->bytes_readonly += cache->key.offset - - btrfs_block_group_used(&cache->item); - cache->ro = 1; - } - spin_unlock(&cache->lock); - spin_unlock(&cache->space_info->lock); -} - u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) { u64 num_devices = root->fs_info->fs_devices->rw_devices; @@ -2798,11 +2768,8 @@ static u64 btrfs_get_alloc_profile(struc void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode) { - u64 alloc_target; - - alloc_target = btrfs_get_alloc_profile(root, 1); BTRFS_I(inode)->space_info = __find_space_info(root->fs_info, - alloc_target); + BTRFS_BLOCK_GROUP_DATA); } static u64 calculate_bytes_needed(struct btrfs_root *root, int num_items) @@ -3408,10 +3375,314 @@ static int shrink_delalloc(struct btrfs_ return reclaimed >= to_reclaim; } +static int should_retry_reserve(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_block_rsv *block_rsv, + u64 num_bytes, int *retries) +{ + struct btrfs_space_info *space_info = block_rsv->space_info; + int ret; + + if ((*retries) > 2) + return -ENOSPC; + + ret = maybe_allocate_chunk(trans, root, space_info, num_bytes); + if (ret) + return 1; + + if (trans && trans->transaction->in_commit) + return -ENOSPC; + + ret = shrink_delalloc(trans, root, space_info, num_bytes); + if (ret) + return ret; + + spin_lock(&space_info->lock); + if (space_info->bytes_pinned < num_bytes) + ret = 1; + spin_unlock(&space_info->lock); + if (ret) + return -ENOSPC; + + (*retries)++; + + if (trans) + return -EAGAIN; + + trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + + return 1; +} + +static int reserve_metadata_bytes(struct btrfs_block_rsv *block_rsv, + u64 num_bytes) +{ + struct btrfs_space_info *space_info = block_rsv->space_info; + u64 unused; + int ret = -ENOSPC; + + spin_lock(&space_info->lock); + unused = space_info->bytes_used + space_info->bytes_reserved + + space_info->bytes_pinned + space_info->bytes_readonly; + + if (unused < space_info->total_bytes) + unused = space_info->total_bytes - unused; + else + unused = 0; + + if (unused >= num_bytes) { + if (block_rsv->priority >= 10) { + space_info->bytes_reserved += num_bytes; + ret = 0; + } else { + if ((unused + block_rsv->reserved) * + block_rsv->priority >= + (num_bytes + block_rsv->reserved) * 10) { + space_info->bytes_reserved += num_bytes; + ret = 0; + } + } + } + spin_unlock(&space_info->lock); + + return ret; +} + +static struct btrfs_block_rsv *get_block_rsv(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct btrfs_block_rsv *block_rsv; + if (root->ref_cows || + root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) + block_rsv = trans->block_rsv; + else + block_rsv = root->block_rsv; + + if (!block_rsv) + block_rsv = &root->fs_info->empty_block_rsv; + + return block_rsv; +} + +static u64 block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv, + u64 num_bytes, int update_size) +{ + spin_lock(&block_rsv->lock); + if (update_size) + block_rsv->size += num_bytes; + block_rsv->reserved += num_bytes; + num_bytes = block_rsv->reserved; + spin_unlock(&block_rsv->lock); + return num_bytes; +} + +void block_rsv_release_bytes(struct btrfs_block_rsv *block_rsv, + u64 num_bytes) +{ + struct btrfs_space_info *space_info = block_rsv->space_info; + + spin_lock(&block_rsv->lock); + if (num_bytes == (u64)-1) + num_bytes = block_rsv->size; + block_rsv->size -= num_bytes; + if (block_rsv->reserved > block_rsv->size) { + num_bytes = block_rsv->reserved - block_rsv->size; + block_rsv->reserved = block_rsv->size; + } else { + num_bytes = 0; + } + spin_unlock(&block_rsv->lock); + + if (num_bytes > 0) { + spin_lock(&space_info->lock); + space_info->bytes_reserved -= num_bytes; + spin_unlock(&space_info->lock); + } +} + +static int block_rsv_migrate_bytes(struct btrfs_block_rsv *src, + struct btrfs_block_rsv *dst, u64 num_bytes) +{ + int ret = -ENOSPC; + + spin_lock(&src->lock); + if (src->reserved >= num_bytes) { + src->reserved -= num_bytes; + ret = 0; + } + spin_unlock(&src->lock); + if (ret) + return ret; + + block_rsv_add_bytes(dst, num_bytes, 1); + return 0; +} + +void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv) +{ + memset(rsv, 0, sizeof(*rsv)); + spin_lock_init(&rsv->lock); + atomic_set(&rsv->usage, 1); + rsv->priority = 6; + INIT_LIST_HEAD(&rsv->list); +} + +struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root) +{ + struct btrfs_block_rsv *block_rsv; + struct btrfs_fs_info *fs_info = root->fs_info; + u64 alloc_target; + + block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS); + if (!block_rsv) + return NULL; + + btrfs_init_block_rsv(block_rsv); + + alloc_target = btrfs_get_alloc_profile(root, 0); + block_rsv->space_info = __find_space_info(fs_info, + BTRFS_BLOCK_GROUP_METADATA); + + return block_rsv; +} + +void btrfs_free_block_rsv(struct btrfs_block_rsv *rsv) +{ + if (rsv && atomic_dec_and_test(&rsv->usage)) { + block_rsv_release_bytes(rsv, (u64)-1); + if (!rsv->durable) + kfree(rsv); + } +} + +/* + * make the block_rsv struct be able to capture freed space. + * the captured space will re-add to the the block_rsv struct + * after transaction commit + */ +void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *block_rsv) +{ + block_rsv->durable = 1; + mutex_lock(&fs_info->durable_block_rsv_mutex); + list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list); + mutex_unlock(&fs_info->durable_block_rsv_mutex); +} + +int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_block_rsv *block_rsv, + u64 num_bytes, int *retries) +{ + int ret; + + if (num_bytes == 0) + return 0; +again: + ret = reserve_metadata_bytes(block_rsv, num_bytes); + if (!ret) { + block_rsv_add_bytes(block_rsv, num_bytes, 1); + return 0; + } + + ret = should_retry_reserve(trans, root, block_rsv, num_bytes, retries); + if (ret > 0) + goto again; + + return ret; +} + +int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_block_rsv *block_rsv, + u64 min_reserved, int min_factor) +{ + u64 num_bytes = 0; + int commit_trans = 0; + int ret = -ENOSPC; + + if (!block_rsv) + return 0; + + spin_lock(&block_rsv->lock); + if (min_factor > 0) + num_bytes = div_factor(block_rsv->size, min_factor); + if (min_reserved > num_bytes) + num_bytes = min_reserved; + + if (block_rsv->reserved >= num_bytes) { + ret = 0; + } else { + num_bytes -= block_rsv->reserved; + if (block_rsv->durable && + block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes) + commit_trans = 1; + } + spin_unlock(&block_rsv->lock); + if (!ret) + return 0; + + if (block_rsv->refill_used) { + ret = reserve_metadata_bytes(block_rsv, num_bytes); + if (!ret) { + block_rsv_add_bytes(block_rsv, num_bytes, 0); + return 0; + } + } + + if (commit_trans) { + if (trans) + return -EAGAIN; + + trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); + ret = btrfs_commit_transaction(trans, root); + return 0; + } + + WARN_ON(1); + printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n", + block_rsv->size, block_rsv->reserved, + block_rsv->freed[0], block_rsv->freed[1]); + + return -ENOSPC; +} + +int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, + struct btrfs_block_rsv *dst_rsv, + u64 num_bytes) +{ + return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes); +} + +void btrfs_block_rsv_release(struct btrfs_block_rsv *block_rsv, + u64 num_bytes) +{ + block_rsv_release_bytes(block_rsv, num_bytes); +} + +static void init_global_block_rsv(struct btrfs_fs_info *fs_info) +{ + struct btrfs_space_info *space_info; + + space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); + fs_info->chunk_block_rsv.space_info = space_info; + fs_info->chunk_block_rsv.priority = 10; + + space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA); + fs_info->trans_block_rsv.space_info = space_info; + fs_info->empty_block_rsv.space_info = space_info; + fs_info->empty_block_rsv.priority = 10; + + fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv; +} + static int update_block_group(struct btrfs_trans_handle *trans, struct btrfs_root *root, - u64 bytenr, u64 num_bytes, int alloc, - int mark_free) + u64 bytenr, u64 num_bytes, int alloc) { struct btrfs_block_group_cache *cache; struct btrfs_fs_info *info = root->fs_info; @@ -3455,30 +3726,21 @@ static int update_block_group(struct btr cache->space_info->bytes_reserved -= num_bytes; cache->space_info->bytes_used += num_bytes; cache->space_info->disk_used += num_bytes * factor; - if (cache->ro) - cache->space_info->bytes_readonly -= num_bytes; spin_unlock(&cache->lock); spin_unlock(&cache->space_info->lock); } else { old_val -= num_bytes; btrfs_set_block_group_used(&cache->item, old_val); + cache->pinned += num_bytes; + cache->space_info->bytes_pinned += num_bytes; cache->space_info->bytes_used -= num_bytes; cache->space_info->disk_used -= num_bytes * factor; - if (cache->ro) - cache->space_info->bytes_readonly += num_bytes; spin_unlock(&cache->lock); spin_unlock(&cache->space_info->lock); - if (mark_free) { - int ret; - ret = btrfs_discard_extent(root, bytenr, - num_bytes); - WARN_ON(ret); - - ret = btrfs_add_free_space(cache, bytenr, - num_bytes); - WARN_ON(ret); - } + set_extent_dirty(info->pinned_extents, + bytenr, bytenr + num_bytes - 1, + GFP_NOFS | __GFP_NOFAIL); } btrfs_put_block_group(cache); total -= num_bytes; @@ -3502,18 +3764,10 @@ static u64 first_logical_byte(struct btr return bytenr; } -/* - * this function must be called within transaction - */ -int btrfs_pin_extent(struct btrfs_root *root, - u64 bytenr, u64 num_bytes, int reserved) +static int pin_down_extent(struct btrfs_root *root, + struct btrfs_block_group_cache *cache, + u64 bytenr, u64 num_bytes, int reserved) { - struct btrfs_fs_info *fs_info = root->fs_info; - struct btrfs_block_group_cache *cache; - - cache = btrfs_lookup_block_group(fs_info, bytenr); - BUG_ON(!cache); - spin_lock(&cache->space_info->lock); spin_lock(&cache->lock); cache->pinned += num_bytes; @@ -3525,28 +3779,68 @@ int btrfs_pin_extent(struct btrfs_root * spin_unlock(&cache->lock); spin_unlock(&cache->space_info->lock); - btrfs_put_block_group(cache); + set_extent_dirty(root->fs_info->pinned_extents, bytenr, + bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL); + return 0; +} - set_extent_dirty(fs_info->pinned_extents, - bytenr, bytenr + num_bytes - 1, GFP_NOFS); +/* + * this function must be called within transaction + */ +int btrfs_pin_extent(struct btrfs_root *root, + u64 bytenr, u64 num_bytes, int reserved) +{ + struct btrfs_block_group_cache *cache; + + cache = btrfs_lookup_block_group(root->fs_info, bytenr); + BUG_ON(!cache); + + pin_down_extent(root, cache, bytenr, num_bytes, reserved); + + btrfs_put_block_group(cache); return 0; } -static int update_reserved_extents(struct btrfs_block_group_cache *cache, - u64 num_bytes, int reserve) +/* + * update size of reserved extents. this function may return -EAGAIN + * if 'reserve' is true or 'sinfo' is false. + */ +static int update_reserved_bytes(struct btrfs_block_group_cache *cache, + u64 num_bytes, int reserve, int sinfo) { - spin_lock(&cache->space_info->lock); - spin_lock(&cache->lock); - if (reserve) { - cache->reserved += num_bytes; - cache->space_info->bytes_reserved += num_bytes; + int ret = 0; + if (sinfo) { + struct btrfs_space_info *space_info = cache->space_info; + spin_lock(&space_info->lock); + spin_lock(&cache->lock); + if (reserve) { + if (cache->ro) { + ret = -EAGAIN; + } else { + cache->reserved += num_bytes; + space_info->bytes_reserved += num_bytes; + } + } else { + if (cache->ro) + space_info->bytes_readonly += num_bytes; + cache->reserved -= num_bytes; + space_info->bytes_reserved -= num_bytes; + } + spin_unlock(&cache->lock); + spin_unlock(&space_info->lock); } else { - cache->reserved -= num_bytes; - cache->space_info->bytes_reserved -= num_bytes; + spin_lock(&cache->lock); + if (cache->ro) { + ret = -EAGAIN; + } else { + if (reserve) + cache->reserved += num_bytes; + else + cache->reserved -= num_bytes; + } + spin_unlock(&cache->lock); } - spin_unlock(&cache->lock); - spin_unlock(&cache->space_info->lock); - return 0; + return ret; } int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, @@ -3603,14 +3897,21 @@ static int unpin_extent_range(struct btr btrfs_add_free_space(cache, start, len); } + start += len; + spin_lock(&cache->space_info->lock); spin_lock(&cache->lock); cache->pinned -= len; cache->space_info->bytes_pinned -= len; + if (cache->ro) { + cache->space_info->bytes_readonly += len; + } else if (cache->reserved_pinned > 0) { + len = min(len, cache->reserved_pinned); + cache->reserved_pinned -= len; + cache->space_info->bytes_reserved += len; + } spin_unlock(&cache->lock); spin_unlock(&cache->space_info->lock); - - start += len; } if (cache) @@ -3623,8 +3924,11 @@ int btrfs_finish_extent_commit(struct bt { struct btrfs_fs_info *fs_info = root->fs_info; struct extent_io_tree *unpin; + struct btrfs_block_rsv *block_rsv; + struct btrfs_block_rsv *next_rsv; u64 start; u64 end; + int idx; int ret; if (fs_info->pinned_extents == &fs_info->freed_extents[0]) @@ -3645,59 +3949,30 @@ int btrfs_finish_extent_commit(struct bt cond_resched(); } - return ret; -} - -static int pin_down_bytes(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, - u64 bytenr, u64 num_bytes, - int is_data, int reserved, - struct extent_buffer **must_clean) -{ - int err = 0; - struct extent_buffer *buf; - - if (is_data) - goto pinit; - - /* - * discard is sloooow, and so triggering discards on - * individual btree blocks isn't a good plan. Just - * pin everything in discard mode. - */ - if (btrfs_test_opt(root, DISCARD)) - goto pinit; - - buf = btrfs_find_tree_block(root, bytenr, num_bytes); - if (!buf) - goto pinit; - - /* we can reuse a block if it hasn't been written - * and it is from this transaction. We can't - * reuse anything from the tree log root because - * it has tiny sub-transactions. - */ - if (btrfs_buffer_uptodate(buf, 0) && - btrfs_try_tree_lock(buf)) { - u64 header_owner = btrfs_header_owner(buf); - u64 header_transid = btrfs_header_generation(buf); - if (header_owner != BTRFS_TREE_LOG_OBJECTID && - header_transid == trans->transid && - !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { - *must_clean = buf; - return 1; + mutex_lock(&fs_info->durable_block_rsv_mutex); + list_for_each_entry_safe(block_rsv, next_rsv, + &fs_info->durable_block_rsv_list, list) { + + idx = trans->transid & 0x1; + if (block_rsv->freed[idx] > 0) { + block_rsv_add_bytes(block_rsv, + block_rsv->freed[idx], 0); + block_rsv->freed[idx] = 0; + } + if (atomic_read(&block_rsv->usage) == 0) { + block_rsv_release_bytes(block_rsv, (u64)-1); + + if (block_rsv->freed[0] == 0 && + block_rsv->freed[1] == 0) { + list_del_init(&block_rsv->list); + kfree(block_rsv); + } + } else { + block_rsv_release_bytes(block_rsv, 0); } - btrfs_tree_unlock(buf); } - free_extent_buffer(buf); -pinit: - if (path) - btrfs_set_path_blocking(path); - /* unlocks the pinned mutex */ - btrfs_pin_extent(root, bytenr, num_bytes, reserved); + mutex_unlock(&fs_info->durable_block_rsv_mutex); - BUG_ON(err < 0); return 0; } @@ -3858,9 +4133,6 @@ static int __btrfs_free_extent(struct bt BUG_ON(ret); } } else { - int mark_free = 0; - struct extent_buffer *must_clean = NULL; - if (found_extent) { BUG_ON(is_data && refs_to_drop != extent_data_ref_count(root, path, iref)); @@ -3873,31 +4145,11 @@ static int __btrfs_free_extent(struct bt } } - ret = pin_down_bytes(trans, root, path, bytenr, - num_bytes, is_data, 0, &must_clean); - if (ret > 0) - mark_free = 1; - BUG_ON(ret < 0); - /* - * it is going to be very rare for someone to be waiting - * on the block we're freeing. del_items might need to - * schedule, so rather than get fancy, just force it - * to blocking here - */ - if (must_clean) - btrfs_set_lock_blocking(must_clean); - ret = btrfs_del_items(trans, extent_root, path, path->slots[0], num_to_del); BUG_ON(ret); btrfs_release_path(extent_root, path); - if (must_clean) { - clean_tree_block(NULL, root, must_clean); - btrfs_tree_unlock(must_clean); - free_extent_buffer(must_clean); - } - if (is_data) { ret = btrfs_del_csums(trans, root, bytenr, num_bytes); BUG_ON(ret); @@ -3907,8 +4159,7 @@ static int __btrfs_free_extent(struct bt (bytenr + num_bytes - 1) >> PAGE_CACHE_SHIFT); } - ret = update_block_group(trans, root, bytenr, num_bytes, 0, - mark_free); + ret = update_block_group(trans, root, bytenr, num_bytes, 0); BUG_ON(ret); } btrfs_free_path(path); @@ -3916,7 +4167,7 @@ static int __btrfs_free_extent(struct bt } /* - * when we free an extent, it is possible (and likely) that we free the last + * when we free an block, it is possible (and likely) that we free the last * delayed ref for that extent as well. This searches the delayed ref tree for * a given extent, and if there are no other delayed refs to be processed, it * removes it from the tree. @@ -3928,7 +4179,7 @@ static noinline int check_ref_cleanup(st struct btrfs_delayed_ref_root *delayed_refs; struct btrfs_delayed_ref_node *ref; struct rb_node *node; - int ret; + int ret = 0; delayed_refs = &trans->transaction->delayed_refs; spin_lock(&delayed_refs->lock); @@ -3980,17 +4231,95 @@ static noinline int check_ref_cleanup(st list_del_init(&head->cluster); spin_unlock(&delayed_refs->lock); - ret = run_one_delayed_ref(trans, root->fs_info->tree_root, - &head->node, head->extent_op, - head->must_insert_reserved); - BUG_ON(ret); + BUG_ON(head->extent_op); + if (head->must_insert_reserved) + ret = 1; + + mutex_unlock(&head->mutex); btrfs_put_delayed_ref(&head->node); - return 0; + return ret; out: spin_unlock(&delayed_refs->lock); return 0; } +void btrfs_free_tree_block(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct extent_buffer *buf, + u64 parent, int last_ref) +{ + struct btrfs_block_rsv *block_rsv; + struct btrfs_block_group_cache *cache = NULL; + int ret; + + if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { + ret = btrfs_add_delayed_tree_ref(trans, buf->start, buf->len, + parent, root->root_key.objectid, + btrfs_header_level(buf), + BTRFS_DROP_DELAYED_REF, NULL); + BUG_ON(ret); + } + + if (!last_ref) + return; + + block_rsv = get_block_rsv(trans, root); + cache = btrfs_lookup_block_group(root->fs_info, buf->start); + + if (btrfs_header_generation(buf) == trans->transid) { + if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { + ret = check_ref_cleanup(trans, root, buf->start); + if (!ret) + goto pin; + } + + if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { + pin_down_extent(root, cache, buf->start, buf->len, 1); + goto pin; + } + + WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)); + ret = 0; + if (block_rsv->size > 0 && !cache->ro) { + spin_lock(&block_rsv->lock); + if (block_rsv->reserved < block_rsv->size) { + block_rsv->reserved += buf->len; + ret = 1; + } + spin_unlock(&block_rsv->lock); + } + + btrfs_add_free_space(cache, buf->start, buf->len); + ret = update_reserved_bytes(cache, buf->len, 0, !ret); + if (ret == -EAGAIN) { + /* block group became read-only */ + spin_lock(&block_rsv->lock); + block_rsv->reserved -= buf->len; + spin_unlock(&block_rsv->lock); + update_reserved_bytes(cache, buf->len, 0, 1); + } + goto out; + } +pin: + if (block_rsv->durable && !cache->ro) { + ret = 0; + spin_lock(&cache->lock); + if (!cache->ro) { + cache->reserved_pinned += buf->len; + ret = 1; + } + spin_unlock(&cache->lock); + + if (ret) { + spin_lock(&block_rsv->lock); + block_rsv->freed[trans->transid & 0x1] += buf->len; + spin_unlock(&block_rsv->lock); + } + } +out: + btrfs_put_block_group(cache); +} + int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 bytenr, u64 num_bytes, u64 parent, @@ -4012,8 +4341,6 @@ int btrfs_free_extent(struct btrfs_trans parent, root_objectid, (int)owner, BTRFS_DROP_DELAYED_REF, NULL); BUG_ON(ret); - ret = check_ref_cleanup(trans, root, bytenr); - BUG_ON(ret); } else { ret = btrfs_add_delayed_data_ref(trans, bytenr, num_bytes, parent, root_objectid, owner, @@ -4023,21 +4350,6 @@ int btrfs_free_extent(struct btrfs_trans return ret; } -int btrfs_free_tree_block(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 bytenr, u32 blocksize, - u64 parent, u64 root_objectid, int level) -{ - u64 used; - spin_lock(&root->node_lock); - used = btrfs_root_used(&root->root_item) - blocksize; - btrfs_set_root_used(&root->root_item, used); - spin_unlock(&root->node_lock); - - return btrfs_free_extent(trans, root, bytenr, blocksize, - parent, root_objectid, level, 0); -} - static u64 stripe_align(struct btrfs_root *root, u64 val) { u64 mask = ((u64)root->stripesize - 1); @@ -4127,7 +4439,6 @@ static noinline int find_free_extent(str u64 num_bytes, u64 empty_size, u64 search_start, u64 search_end, u64 hint_byte, struct btrfs_key *ins, - u64 exclude_start, u64 exclude_nr, int data) { int ret = 0; @@ -4139,8 +4450,8 @@ static noinline int find_free_extent(str int done_chunk_alloc = 0; struct btrfs_space_info *space_info; int last_ptr_loop = 0; - int index = 0; int loop = 0; + int index = 0; bool found_uncached_bg = false; bool failed_cluster_refill = false; bool failed_alloc = false; @@ -4411,23 +4722,22 @@ checks: goto loop; } - if (exclude_nr > 0 && - (search_start + num_bytes > exclude_start && - search_start < exclude_start + exclude_nr)) { - search_start = exclude_start + exclude_nr; + ins->objectid = search_start; + ins->offset = num_bytes; + + if (offset < search_start) + btrfs_add_free_space(block_group, offset, + search_start - offset); + BUG_ON(offset > search_start); + ret = update_reserved_bytes(block_group, num_bytes, 1, + (data & BTRFS_BLOCK_GROUP_DATA)); + if (ret == -EAGAIN) { btrfs_add_free_space(block_group, offset, num_bytes); - /* - * if search_start is still in this block group - * then we just re-search this block group - */ - if (search_start >= block_group->key.objectid && - search_start < (block_group->key.objectid + - block_group->key.offset)) - goto have_block_group; goto loop; } + /* we are all good, lets return */ ins->objectid = search_start; ins->offset = num_bytes; @@ -4435,10 +4745,6 @@ checks: btrfs_add_free_space(block_group, offset, search_start - offset); BUG_ON(offset > search_start); - - update_reserved_extents(block_group, num_bytes, 1); - - /* we are all good, lets return */ break; loop: failed_cluster_refill = false; @@ -4612,9 +4918,8 @@ again: WARN_ON(num_bytes < root->sectorsize); ret = find_free_extent(trans, root, num_bytes, empty_size, - search_start, search_end, hint_byte, ins, - trans->alloc_exclude_start, - trans->alloc_exclude_nr, data); + search_start, search_end, hint_byte, + ins, data); if (ret == -ENOSPC && num_bytes > min_alloc_size) { num_bytes = num_bytes >> 1; @@ -4652,7 +4957,7 @@ int btrfs_free_reserved_extent(struct bt ret = btrfs_discard_extent(root, start, len); btrfs_add_free_space(cache, start, len); - update_reserved_extents(cache, len, 0); + update_reserved_bytes(cache, len, 0, 1); btrfs_put_block_group(cache); return ret; @@ -4715,8 +5020,7 @@ static int alloc_reserved_file_extent(st btrfs_mark_buffer_dirty(path->nodes[0]); btrfs_free_path(path); - ret = update_block_group(trans, root, ins->objectid, ins->offset, - 1, 0); + ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); if (ret) { printk(KERN_ERR "btrfs update block group failed for %llu " "%llu\n", (unsigned long long)ins->objectid, @@ -4776,8 +5080,7 @@ static int alloc_reserved_tree_block(str btrfs_mark_buffer_dirty(leaf); btrfs_free_path(path); - ret = update_block_group(trans, root, ins->objectid, ins->offset, - 1, 0); + ret = update_block_group(trans, root, ins->objectid, ins->offset, 1); if (ret) { printk(KERN_ERR "btrfs update block group failed for %llu " "%llu\n", (unsigned long long)ins->objectid, @@ -4853,73 +5156,14 @@ int btrfs_alloc_logged_file_extent(struc put_caching_control(caching_ctl); } - update_reserved_extents(block_group, ins->offset, 1); + ret = update_reserved_bytes(block_group, ins->offset, 1, 1); + BUG_ON(ret); btrfs_put_block_group(block_group); ret = alloc_reserved_file_extent(trans, root, 0, root_objectid, 0, owner, offset, ins, 1); return ret; } -/* - * finds a free extent and does all the dirty work required for allocation - * returns the key for the extent through ins, and a tree buffer for - * the first block of the extent through buf. - * - * returns 0 if everything worked, non-zero otherwise. - */ -static int alloc_tree_block(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 num_bytes, u64 parent, u64 root_objectid, - struct btrfs_disk_key *key, int level, - u64 empty_size, u64 hint_byte, u64 search_end, - struct btrfs_key *ins) -{ - int ret; - u64 flags = 0; - - ret = btrfs_reserve_extent(trans, root, num_bytes, num_bytes, - empty_size, hint_byte, search_end, - ins, 0); - if (ret) - return ret; - - if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { - if (parent == 0) - parent = ins->objectid; - flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; - } else - BUG_ON(parent > 0); - - if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { - struct btrfs_delayed_extent_op *extent_op; - extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); - BUG_ON(!extent_op); - if (key) - memcpy(&extent_op->key, key, sizeof(extent_op->key)); - else - memset(&extent_op->key, 0, sizeof(extent_op->key)); - extent_op->flags_to_set = flags; - extent_op->update_key = 1; - extent_op->update_flags = 1; - extent_op->is_data = 0; - - ret = btrfs_add_delayed_tree_ref(trans, ins->objectid, - ins->offset, parent, root_objectid, - level, BTRFS_ADD_DELAYED_EXTENT, - extent_op); - BUG_ON(ret); - } - - if (root_objectid == root->root_key.objectid) { - u64 used; - spin_lock(&root->node_lock); - used = btrfs_root_used(&root->root_item) + num_bytes; - btrfs_set_root_used(&root->root_item, used); - spin_unlock(&root->node_lock); - } - return ret; -} - struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 bytenr, u32 blocksize, @@ -4958,8 +5202,50 @@ struct extent_buffer *btrfs_init_new_buf return buf; } +static struct btrfs_block_rsv * +use_block_rsv(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u32 blocksize) +{ + struct btrfs_block_rsv *block_rsv; + int ret = -1; + + block_rsv = get_block_rsv(trans, root); + + if (block_rsv->size == 0) { + ret = reserve_metadata_bytes(block_rsv, blocksize); + if (ret) + return ERR_PTR(ret); + return block_rsv; + } + + spin_lock(&block_rsv->lock); + if (block_rsv->reserved >= blocksize) { + block_rsv->reserved -= blocksize; + ret = 0; + } + spin_unlock(&block_rsv->lock); + if (!ret) + return block_rsv; + + WARN_ON(1); + printk(KERN_INFO"block_rsv size %llu reserved %llu freed %llu %llu\n", + block_rsv->size, block_rsv->reserved, + block_rsv->freed[0], block_rsv->freed[1]); + + return ERR_PTR(-ENOSPC); +} + +static void unuse_block_rsv(struct btrfs_block_rsv *block_rsv, u32 blocksize) +{ + block_rsv_add_bytes(block_rsv, blocksize, 0); + block_rsv_release_bytes(block_rsv, 0); +} + /* - * helper function to allocate a block for a given tree + * finds a free extent and does all the dirty work required for allocation + * returns the key for the extent through ins, and a tree buffer for + * the first block of the extent through buf. + * * returns the tree buffer or NULL. */ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, @@ -4969,18 +5255,53 @@ struct extent_buffer *btrfs_alloc_free_b u64 hint, u64 empty_size) { struct btrfs_key ins; - int ret; + struct btrfs_block_rsv *block_rsv; struct extent_buffer *buf; + u64 flags = 0; + int ret; - ret = alloc_tree_block(trans, root, blocksize, parent, root_objectid, - key, level, empty_size, hint, (u64)-1, &ins); + + block_rsv = use_block_rsv(trans, root, blocksize); + if (IS_ERR(block_rsv)) + return ERR_CAST(block_rsv); + + ret = btrfs_reserve_extent(trans, root, blocksize, blocksize, + empty_size, hint, (u64)-1, &ins, 0); if (ret) { - BUG_ON(ret > 0); + unuse_block_rsv(block_rsv, blocksize); return ERR_PTR(ret); } buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize, level); + BUG_ON(IS_ERR(buf)); + + if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { + if (parent == 0) + parent = ins.objectid; + flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + } else + BUG_ON(parent > 0); + + if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { + struct btrfs_delayed_extent_op *extent_op; + extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); + BUG_ON(!extent_op); + if (key) + memcpy(&extent_op->key, key, sizeof(extent_op->key)); + else + memset(&extent_op->key, 0, sizeof(extent_op->key)); + extent_op->flags_to_set = flags; + extent_op->update_key = 1; + extent_op->update_flags = 1; + extent_op->is_data = 0; + + ret = btrfs_add_delayed_tree_ref(trans, ins.objectid, + ins.offset, parent, root_objectid, + level, BTRFS_ADD_DELAYED_EXTENT, + extent_op); + BUG_ON(ret); + } return buf; } @@ -5305,7 +5626,7 @@ static noinline int walk_up_proc(struct struct btrfs_path *path, struct walk_control *wc) { - int ret = 0; + int ret; int level = wc->level; struct extent_buffer *eb = path->nodes[level]; u64 parent = 0; @@ -5383,13 +5704,11 @@ static noinline int walk_up_proc(struct btrfs_header_owner(path->nodes[level + 1])); } - ret = btrfs_free_extent(trans, root, eb->start, eb->len, parent, - root->root_key.objectid, level, 0); - BUG_ON(ret); + btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1); out: wc->refs[level] = 0; wc->flags[level] = 0; - return ret; + return 0; } static noinline int walk_down_tree(struct btrfs_trans_handle *trans, @@ -7212,48 +7531,80 @@ static u64 update_block_group_flags(stru return flags; } -static int __alloc_chunk_for_shrink(struct btrfs_root *root, - struct btrfs_block_group_cache *shrink_block_group, - int force) +static int set_block_group_ro(struct btrfs_block_group_cache *cache) { - struct btrfs_trans_handle *trans; - u64 new_alloc_flags; - u64 calc; + struct btrfs_space_info *sinfo = cache->space_info; + u64 num_bytes; + int ret = -ENOSPC; - spin_lock(&shrink_block_group->lock); - if (btrfs_block_group_used(&shrink_block_group->item) + - shrink_block_group->reserved > 0) { - spin_unlock(&shrink_block_group->lock); + if (cache->ro) + return 0; - trans = btrfs_start_transaction(root, 1); - spin_lock(&shrink_block_group->lock); + spin_lock(&sinfo->lock); + spin_lock(&cache->lock); + num_bytes = cache->key.offset - cache->reserved - cache->pinned - + cache->bytes_super - btrfs_block_group_used(&cache->item); - new_alloc_flags = update_block_group_flags(root, - shrink_block_group->flags); - if (new_alloc_flags != shrink_block_group->flags) { - calc = - btrfs_block_group_used(&shrink_block_group->item); - } else { - calc = shrink_block_group->key.offset; - } - spin_unlock(&shrink_block_group->lock); + if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned + + sinfo->bytes_may_use + sinfo->bytes_readonly + + cache->reserved_pinned + num_bytes < sinfo->total_bytes) { + sinfo->bytes_readonly += num_bytes; + sinfo->bytes_reserved += cache->reserved_pinned; + cache->reserved_pinned = 0; + cache->ro = 1; + ret = 0; + } + spin_unlock(&cache->lock); + spin_unlock(&sinfo->lock); + return ret; +} - do_chunk_alloc(trans, root->fs_info->extent_root, - calc + 2 * 1024 * 1024, new_alloc_flags, force); +int btrfs_set_block_group_ro(struct btrfs_root *root, + struct btrfs_block_group_cache *cache) - btrfs_end_transaction(trans, root); - } else - spin_unlock(&shrink_block_group->lock); - return 0; -} +{ + struct btrfs_trans_handle *trans; + u64 alloc_flags; + int ret; + BUG_ON(cache->ro); -int btrfs_prepare_block_group_relocation(struct btrfs_root *root, - struct btrfs_block_group_cache *group) + trans = btrfs_join_transaction(root, 1); + BUG_ON(IS_ERR(trans)); + alloc_flags = update_block_group_flags(root, cache->flags); + if (alloc_flags != cache->flags) + do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); + + ret = set_block_group_ro(cache); + if (!ret) + goto out; + alloc_flags = get_alloc_profile(root, cache->space_info->flags); + ret = do_chunk_alloc(trans, root, 2 * 1024 * 1024, alloc_flags, 1); + if (ret < 0) + goto out; + ret = set_block_group_ro(cache); +out: + btrfs_end_transaction(trans, root); + return ret; +} + +int btrfs_set_block_group_rw(struct btrfs_root *root, + struct btrfs_block_group_cache *cache) { - __alloc_chunk_for_shrink(root, group, 1); - set_block_group_readonly(group); + struct btrfs_space_info *sinfo = cache->space_info; + u64 num_bytes; + + BUG_ON(!cache->ro); + + spin_lock(&sinfo->lock); + spin_lock(&cache->lock); + num_bytes = cache->key.offset - cache->reserved - cache->pinned - + cache->bytes_super - btrfs_block_group_used(&cache->item); + sinfo->bytes_readonly -= num_bytes; + cache->ro = 0; + spin_unlock(&cache->lock); + spin_unlock(&sinfo->lock); return 0; } @@ -7424,7 +7775,11 @@ int btrfs_free_block_groups(struct btrfs space_info = list_entry(info->space_info.next, struct btrfs_space_info, list); - + if (space_info->bytes_pinned > 0 || + space_info->bytes_reserved > 0) { + WARN_ON(1); + dump_space_info(space_info, 0, 0); + } list_del(&space_info->list); kfree(space_info); } @@ -7472,7 +7827,7 @@ int btrfs_read_block_groups(struct btrfs cache = kzalloc(sizeof(*cache), GFP_NOFS); if (!cache) { ret = -ENOMEM; - break; + goto error; } atomic_set(&cache->count, 1); @@ -7529,7 +7884,7 @@ int btrfs_read_block_groups(struct btrfs BUG_ON(ret); cache->space_info = space_info; spin_lock(&cache->space_info->lock); - cache->space_info->bytes_super += cache->bytes_super; + cache->space_info->bytes_readonly += cache->bytes_super; spin_unlock(&cache->space_info->lock); __link_block_group(space_info, cache); @@ -7539,7 +7894,7 @@ int btrfs_read_block_groups(struct btrfs set_avail_alloc_bits(root->fs_info, cache->flags); if (btrfs_chunk_readonly(root, cache->key.objectid)) - set_block_group_readonly(cache); + set_block_group_ro(cache); } list_for_each_entry_rcu(space_info, &root->fs_info->space_info, list) { @@ -7553,10 +7908,12 @@ int btrfs_read_block_groups(struct btrfs * mirrored block groups. */ list_for_each_entry(cache, &space_info->block_groups[3], list) - set_block_group_readonly(cache); + set_block_group_ro(cache); list_for_each_entry(cache, &space_info->block_groups[4], list) - set_block_group_readonly(cache); + set_block_group_ro(cache); } + + init_global_block_rsv(info); ret = 0; error: btrfs_free_path(path); @@ -7617,7 +7974,7 @@ int btrfs_make_block_group(struct btrfs_ BUG_ON(ret); spin_lock(&cache->space_info->lock); - cache->space_info->bytes_super += cache->bytes_super; + cache->space_info->bytes_readonly += cache->bytes_super; spin_unlock(&cache->space_info->lock); __link_block_group(cache->space_info, cache); diff -urp 5/fs/btrfs/relocation.c 6/fs/btrfs/relocation.c --- 5/fs/btrfs/relocation.c 2010-04-14 14:49:58.099940000 +0800 +++ 6/fs/btrfs/relocation.c 2010-04-18 10:22:08.223947640 +0800 @@ -3513,6 +3513,7 @@ int btrfs_relocate_block_group(struct bt struct btrfs_fs_info *fs_info = extent_root->fs_info; struct reloc_control *rc; int ret; + int rw = 0; int err = 0; rc = kzalloc(sizeof(*rc), GFP_NOFS); @@ -3523,15 +3524,22 @@ int btrfs_relocate_block_group(struct bt extent_io_tree_init(&rc->processed_blocks, NULL, GFP_NOFS); INIT_LIST_HEAD(&rc->reloc_roots); + rc->extent_root = extent_root; rc->block_group = btrfs_lookup_block_group(fs_info, group_start); BUG_ON(!rc->block_group); + if (!rc->block_group->ro) { + ret = btrfs_set_block_group_ro(extent_root, rc->block_group); + if (ret) { + err = ret; + goto out; + } + rw = 1; + } + btrfs_init_workers(&rc->workers, "relocate", fs_info->thread_pool_size, NULL); - rc->extent_root = extent_root; - btrfs_prepare_block_group_relocation(extent_root, rc->block_group); - rc->data_inode = create_reloc_inode(fs_info, rc->block_group); if (IS_ERR(rc->data_inode)) { err = PTR_ERR(rc->data_inode); @@ -3596,6 +3604,8 @@ int btrfs_relocate_block_group(struct bt WARN_ON(rc->block_group->reserved > 0); WARN_ON(btrfs_block_group_used(&rc->block_group->item) > 0); out: + if (err && rw) + btrfs_set_block_group_rw(extent_root, rc->block_group); iput(rc->data_inode); btrfs_stop_workers(&rc->workers); btrfs_put_block_group(rc->block_group); diff -urp 5/fs/btrfs/transaction.c 6/fs/btrfs/transaction.c --- 5/fs/btrfs/transaction.c 2010-04-14 14:49:58.391967000 +0800 +++ 6/fs/btrfs/transaction.c 2010-04-18 10:22:08.223947640 +0800 @@ -184,9 +184,8 @@ static struct btrfs_trans_handle *start_ h->blocks_reserved = num_blocks; h->blocks_used = 0; h->block_group = 0; - h->alloc_exclude_nr = 0; - h->alloc_exclude_start = 0; h->delayed_ref_updates = 0; + h->block_rsv = NULL; if (!current->journal_info && type != TRANS_USERSPACE) current->journal_info = h; diff -urp 5/fs/btrfs/transaction.h 6/fs/btrfs/transaction.h --- 5/fs/btrfs/transaction.h 2010-04-13 15:44:56.117812000 +0800 +++ 6/fs/btrfs/transaction.h 2010-04-18 10:22:08.223947640 +0800 @@ -45,13 +45,13 @@ struct btrfs_transaction { struct btrfs_trans_handle { u64 transid; + u64 block_group; + u64 bytes_reserved; unsigned long blocks_reserved; unsigned long blocks_used; - struct btrfs_transaction *transaction; - u64 block_group; - u64 alloc_exclude_start; - u64 alloc_exclude_nr; unsigned long delayed_ref_updates; + struct btrfs_transaction *transaction; + struct btrfs_block_rsv *block_rsv; }; struct btrfs_pending_snapshot {