diff options
| -rw-r--r-- | fs/btrfs/ctree.c | 228 | ||||
| -rw-r--r-- | fs/btrfs/ctree.h | 62 | ||||
| -rw-r--r-- | fs/btrfs/disk-io.c | 4 | ||||
| -rw-r--r-- | fs/btrfs/extent-tree.c | 1143 | ||||
| -rw-r--r-- | fs/btrfs/extent_io.c | 3 | ||||
| -rw-r--r-- | fs/btrfs/file.c | 121 | ||||
| -rw-r--r-- | fs/btrfs/inode.c | 57 | ||||
| -rw-r--r-- | fs/btrfs/ioctl.c | 57 | ||||
| -rw-r--r-- | fs/btrfs/print-tree.c | 5 | ||||
| -rw-r--r-- | fs/btrfs/tree-log.c | 108 |
10 files changed, 1066 insertions, 722 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 6f467901246f..50aea8cb653a 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -125,7 +125,6 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans, u32 nritems; int ret = 0; int level; - struct btrfs_key first_key; struct btrfs_root *new_root; new_root = kmalloc(sizeof(*new_root), GFP_NOFS); @@ -141,18 +140,10 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans, level = btrfs_header_level(buf); nritems = btrfs_header_nritems(buf); - if (nritems) { - if (level == 0) - btrfs_item_key_to_cpu(buf, &first_key, 0); - else - btrfs_node_key_to_cpu(buf, &first_key, 0); - } else { - first_key.objectid = 0; - } - cow = btrfs_alloc_free_block(trans, new_root, buf->len, - new_root_objectid, - trans->transid, first_key.objectid, - level, buf->start, 0); + + cow = btrfs_alloc_free_block(trans, new_root, buf->len, 0, + new_root_objectid, trans->transid, + level, buf->start, 0); if (IS_ERR(cow)) { kfree(new_root); return PTR_ERR(cow); @@ -165,7 +156,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans, btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN); WARN_ON(btrfs_header_generation(buf) > trans->transid); - ret = btrfs_inc_ref(trans, new_root, buf, 0); + ret = btrfs_inc_ref(trans, new_root, buf, cow, NULL); kfree(new_root); if (ret) @@ -184,39 +175,31 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans, u64 search_start, u64 empty_size, u64 prealloc_dest) { - u64 root_gen; + u64 parent_start; struct extent_buffer *cow; u32 nritems; int ret = 0; int different_trans = 0; int level; int unlock_orig = 0; - struct btrfs_key first_key; if (*cow_ret == buf) unlock_orig = 1; WARN_ON(!btrfs_tree_locked(buf)); - if (root->ref_cows) { - root_gen = trans->transid; - } else { - root_gen = 0; - } + if (parent) + parent_start = parent->start; + else + parent_start = 0; + WARN_ON(root->ref_cows && trans->transid != root->fs_info->running_transaction->transid); WARN_ON(root->ref_cows && trans->transid != root->last_trans); level = btrfs_header_level(buf); nritems = btrfs_header_nritems(buf); - if (nritems) { - if (level == 0) - btrfs_item_key_to_cpu(buf, &first_key, 0); - else - btrfs_node_key_to_cpu(buf, &first_key, 0); - } else { - first_key.objectid = 0; - } + if (prealloc_dest) { struct btrfs_key ins; @@ -224,19 +207,19 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans, ins.offset = buf->len; ins.type = BTRFS_EXTENT_ITEM_KEY; - ret = btrfs_alloc_reserved_extent(trans, root, + ret = btrfs_alloc_reserved_extent(trans, root, parent_start, root->root_key.objectid, - root_gen, level, - first_key.objectid, + trans->transid, level, 0, &ins); BUG_ON(ret); cow = btrfs_init_new_buffer(trans, root, prealloc_dest, buf->len); } else { cow = btrfs_alloc_free_block(trans, root, buf->len, + parent_start, root->root_key.objectid, - root_gen, first_key.objectid, - level, search_start, empty_size); + trans->transid, level, + search_start, empty_size); } if (IS_ERR(cow)) return PTR_ERR(cow); @@ -249,17 +232,23 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans, WARN_ON(btrfs_header_generation(buf) > trans->transid); if (btrfs_header_generation(buf) != trans->transid) { + u32 nr_extents; different_trans = 1; - ret = btrfs_inc_ref(trans, root, buf, 1); + ret = btrfs_inc_ref(trans, root, buf, cow, &nr_extents); if (ret) return ret; + + ret = btrfs_cache_ref(trans, root, buf, nr_extents); + WARN_ON(ret); } else { + ret = btrfs_update_ref(trans, root, buf, cow, 0, nritems); + if (ret) + return ret; clean_tree_block(trans, root, buf); } if (buf == root->node) { WARN_ON(parent && parent != buf); - root_gen = btrfs_header_generation(buf); spin_lock(&root->node_lock); root->node = cow; @@ -268,13 +257,14 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans, if (buf != root->commit_root) { btrfs_free_extent(trans, root, buf->start, - buf->len, root->root_key.objectid, - root_gen, 0, 0, 1); + buf->len, buf->start, + root->root_key.objectid, + btrfs_header_generation(buf), + 0, 0, 1); } free_extent_buffer(buf); add_root_to_dirty_list(root); } else { - root_gen = btrfs_header_generation(parent); btrfs_set_node_blockptr(parent, parent_slot, cow->start); WARN_ON(trans->transid == 0); @@ -283,8 +273,8 @@ int noinline __btrfs_cow_block(struct btrfs_trans_handle *trans, btrfs_mark_buffer_dirty(parent); WARN_ON(btrfs_header_generation(parent) != trans->transid); btrfs_free_extent(trans, root, buf->start, buf->len, - btrfs_header_owner(parent), root_gen, - 0, 0, 1); + parent_start, btrfs_header_owner(parent), + btrfs_header_generation(parent), 0, 0, 1); } if (unlock_orig) btrfs_tree_unlock(buf); @@ -831,6 +821,12 @@ static noinline int balance_level(struct btrfs_trans_handle *trans, root->node = child; spin_unlock(&root->node_lock); + ret = btrfs_update_extent_ref(trans, root, child->start, + mid->start, child->start, + root->root_key.objectid, + trans->transid, level - 1, 0); + BUG_ON(ret); + add_root_to_dirty_list(root); btrfs_tree_unlock(child); path->locks[level] = 0; @@ -840,7 +836,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans, /* once for the path */ free_extent_buffer(mid); ret = btrfs_free_extent(trans, root, mid->start, mid->len, - root->root_key.objectid, + mid->start, root->root_key.objectid, btrfs_header_generation(mid), 0, 0, 1); /* once for the root ptr */ free_extent_buffer(mid); @@ -905,7 +901,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans, if (wret) ret = wret; wret = btrfs_free_extent(trans, root, bytenr, - blocksize, + blocksize, parent->start, btrfs_header_owner(parent), generation, 0, 0, 1); if (wret) @@ -954,6 +950,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans, if (wret) ret = wret; wret = btrfs_free_extent(trans, root, bytenr, blocksize, + parent->start, btrfs_header_owner(parent), root_gen, 0, 0, 1); if (wret) @@ -1500,6 +1497,41 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans, } /* + * update item key. + * + * This function isn't completely safe. It's the caller's responsibility + * that the new key won't break the order + */ +int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct btrfs_path *path, + struct btrfs_key *new_key) +{ + struct btrfs_disk_key disk_key; + struct extent_buffer *eb; + int slot; + + eb = path->nodes[0]; + slot = path->slots[0]; + if (slot > 0) { + btrfs_item_key(eb, &disk_key, slot - 1); + if (comp_keys(&disk_key, new_key) >= 0) + return -1; + } + if (slot < btrfs_header_nritems(eb) - 1) { + btrfs_item_key(eb, &disk_key, slot + 1); + if (comp_keys(&disk_key, new_key) <= 0) + return -1; + } + + btrfs_cpu_key_to_disk(&disk_key, new_key); + btrfs_set_item_key(eb, &disk_key, slot); + btrfs_mark_buffer_dirty(eb); + if (slot == 0) + fixup_low_keys(trans, root, path, &disk_key, 1); + return 0; +} + +/* * try to push data from one node into the next node left in the * tree. * @@ -1558,6 +1590,10 @@ static int push_node_left(struct btrfs_trans_handle *trans, btrfs_set_header_nritems(dst, dst_nritems + push_items); btrfs_mark_buffer_dirty(src); btrfs_mark_buffer_dirty(dst); + + ret = btrfs_update_ref(trans, root, src, dst, dst_nritems, push_items); + BUG_ON(ret); + return ret; } @@ -1619,6 +1655,10 @@ static int balance_node_right(struct btrfs_trans_handle *trans, btrfs_mark_buffer_dirty(src); btrfs_mark_buffer_dirty(dst); + + ret = btrfs_update_ref(trans, root, src, dst, 0, push_items); + BUG_ON(ret); + return ret; } @@ -1633,30 +1673,24 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level) { - u64 root_gen; u64 lower_gen; struct extent_buffer *lower; struct extent_buffer *c; struct extent_buffer *old; struct btrfs_disk_key lower_key; + int ret; BUG_ON(path->nodes[level]); BUG_ON(path->nodes[level-1] != root->node); - if (root->ref_cows) - root_gen = trans->transid; - else - root_gen = 0; - lower = path->nodes[level-1]; if (level == 1) btrfs_item_key(lower, &lower_key, 0); else btrfs_node_key(lower, &lower_key, 0); - c = btrfs_alloc_free_block(trans, root, root->nodesize, - root->root_key.objectid, - root_gen, le64_to_cpu(lower_key.objectid), + c = btrfs_alloc_free_block(trans, root, root->nodesize, 0, + root->root_key.objectid, trans->transid, level, root->node->start, 0); if (IS_ERR(c)) return PTR_ERR(c); @@ -1679,7 +1713,7 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans, btrfs_set_node_key(c, &lower_key, 0); btrfs_set_node_blockptr(c, 0, lower->start); lower_gen = btrfs_header_generation(lower); - WARN_ON(lower_gen == 0); + WARN_ON(lower_gen != trans->transid); btrfs_set_node_ptr_generation(c, 0, lower_gen); @@ -1690,6 +1724,12 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans, root->node = c; spin_unlock(&root->node_lock); + ret = btrfs_update_extent_ref(trans, root, lower->start, + lower->start, c->start, + root->root_key.objectid, + trans->transid, level - 1, 0); + BUG_ON(ret); + /* the super has an extra ref to root->node */ free_extent_buffer(old); @@ -1698,20 +1738,6 @@ static int noinline insert_new_root(struct btrfs_trans_handle *trans, path->nodes[level] = c; path->locks[level] = 1; path->slots[level] = 0; - - if (root->ref_cows && lower_gen != trans->transid) { - struct btrfs_path *back_path = btrfs_alloc_path(); - int ret; - mutex_lock(&root->fs_info->alloc_mutex); - ret = btrfs_insert_extent_backref(trans, - root->fs_info->extent_root, - path, lower->start, - root->root_key.objectid, - trans->transid, 0, 0); - BUG_ON(ret); - mutex_unlock(&root->fs_info->alloc_mutex); - btrfs_free_path(back_path); - } return 0; } @@ -1766,7 +1792,6 @@ static noinline int split_node(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, int level) { - u64 root_gen; struct extent_buffer *c; struct extent_buffer *split; struct btrfs_disk_key disk_key; @@ -1793,17 +1818,11 @@ static noinline int split_node(struct btrfs_trans_handle *trans, } c_nritems = btrfs_header_nritems(c); - if (root->ref_cows) - root_gen = trans->transid; - else - root_gen = 0; - btrfs_node_key(c, &disk_key, 0); split = btrfs_alloc_free_block(trans, root, root->nodesize, - root->root_key.objectid, - root_gen, - btrfs_disk_key_objectid(&disk_key), - level, c->start, 0); + path->nodes[level + 1]->start, + root->root_key.objectid, + trans->transid, level, c->start, 0); if (IS_ERR(split)) return PTR_ERR(split); @@ -1840,6 +1859,9 @@ static noinline int split_node(struct btrfs_trans_handle *trans, if (wret) ret = wret; + ret = btrfs_update_ref(trans, root, c, split, 0, c_nritems - mid); + BUG_ON(ret); + if (path->slots[level] >= mid) { path->slots[level] -= mid; btrfs_tree_unlock(c); @@ -1955,10 +1977,23 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root else nr = 1; + if (path->slots[0] >= left_nritems) + push_space += data_size + sizeof(*item); + i = left_nritems - 1; while (i >= nr) { item = btrfs_item_nr(left, i); + if (!empty && push_items > 0) { + if (path->slots[0] > i) + break; + if (path->slots[0] == i) { + int space = btrfs_leaf_free_space(root, left); + if (space + push_space * 2 > free_space) + break; + } + } + if (path->slots[0] == i) push_space += data_size + sizeof(*item); @@ -1973,6 +2008,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root this_item_size = btrfs_item_size(left, item); if (this_item_size + sizeof(*item) + push_space > free_space) break; + push_items++; push_space += this_item_size + sizeof(*item); if (i == 0) @@ -2046,6 +2082,9 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_mark_buffer_dirty(left); btrfs_mark_buffer_dirty(right); + ret = btrfs_update_ref(trans, root, left, right, 0, push_items); + BUG_ON(ret); + btrfs_item_key(right, &disk_key, 0); btrfs_set_node_key(upper, &disk_key, slot + 1); btrfs_mark_buffer_dirty(upper); @@ -2147,6 +2186,16 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root KM_USER1); } + if (!empty && push_items > 0) { + if (path->slots[0] < i) + break; + if (path->slots[0] == i) { + int space = btrfs_leaf_free_space(root, right); + if (space + push_space * 2 > free_space) + break; + } + } + if (path->slots[0] == i) push_space += data_size + sizeof(*item); @@ -2255,6 +2304,10 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root if (right_nritems) btrfs_mark_buffer_dirty(right); + ret = btrfs_update_ref(trans, root, right, left, + old_left_nritems, push_items); + BUG_ON(ret); + btrfs_item_key(right, &disk_key, 0); wret = fixup_low_keys(trans, root, path, &disk_key, 1); if (wret) @@ -2294,7 +2347,6 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_path *path, int data_size, int extend) { - u64 root_gen; struct extent_buffer *l; u32 nritems; int mid; @@ -2313,11 +2365,6 @@ static noinline int split_leaf(struct btrfs_trans_handle *trans, if (extend) space_needed = data_size; - if (root->ref_cows) - root_gen = trans->transid; - else - root_gen = 0; - /* first try to make some room by pushing left and right */ if (ins_key->type != BTRFS_DIR_ITEM_KEY) { wret = push_leaf_right(trans, root, path, data_size, 0); @@ -2348,13 +2395,10 @@ again: nritems = btrfs_header_nritems(l); mid = (nritems + 1)/ 2; - btrfs_item_key(l, &disk_key, 0); - right = btrfs_alloc_free_block(trans, root, root->leafsize, - root->root_key.objectid, - root_gen, - le64_to_cpu(disk_key.objectid), - 0, l->start, 0); + path->nodes[1]->start, + root->root_key.objectid, + trans->transid, 0, l->start, 0); if (IS_ERR(right)) { BUG_ON(1); return PTR_ERR(right); @@ -2485,6 +2529,9 @@ again: btrfs_mark_buffer_dirty(l); BUG_ON(path->slots[0] != slot); + ret = btrfs_update_ref(trans, root, l, right, 0, nritems); + BUG_ON(ret); + if (mid <= slot) { btrfs_tree_unlock(path->nodes[0]); free_extent_buffer(path->nodes[0]); @@ -2956,6 +3003,7 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, ret = wret; wret = btrfs_free_extent(trans, root, leaf->start, leaf->len, + path->nodes[1]->start, btrfs_header_owner(path->nodes[1]), root_gen, 0, 0, 1); if (wret) @@ -3007,7 +3055,7 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, free_extent_buffer(leaf); wret = btrfs_free_extent(trans, root, bytenr, - blocksize, + blocksize, path->nodes[1]->start, btrfs_header_owner(path->nodes[1]), root_gen, 0, 0, 1); if (wret) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 730aae3bc181..138c157bbc45 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -40,7 +40,7 @@ extern struct kmem_cache *btrfs_bit_radix_cachep; extern struct kmem_cache *btrfs_path_cachep; struct btrfs_ordered_sum; -#define BTRFS_MAGIC "_B8RfS_M" +#define BTRFS_MAGIC "_B9RfS_M" #define BTRFS_ACL_NOT_CACHED ((void *)-1) @@ -81,6 +81,9 @@ struct btrfs_ordered_sum; #define BTRFS_TREE_LOG_OBJECTID -6ULL #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL +/* dummy objectid represents multiple objectids */ +#define BTRFS_MULTIPLE_OBJECTIDS -255ULL + /* * All files have objectids in this range. */ @@ -369,6 +372,7 @@ struct btrfs_extent_ref { __le64 generation; __le64 objectid; __le64 offset; + __le32 num_refs; } __attribute__ ((__packed__)); /* dev extents record free space on individual devices. The owner @@ -1047,9 +1051,6 @@ btrfs_inode_otime(struct btrfs_inode_item *inode_item) BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); -/* struct btrfs_extent_item */ -BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32); - /* struct btrfs_dev_extent */ BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, chunk_tree, 64); @@ -1070,14 +1071,20 @@ BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64); BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64); BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64); BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64); +BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32); BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64); BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref, generation, 64); BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref, objectid, 64); -BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64); +BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, + offset, 64); +BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref, + num_refs, 32); +/* struct btrfs_extent_item */ +BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32); BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 32); @@ -1474,8 +1481,7 @@ static inline struct dentry *fdentry(struct file *file) { } /* extent-tree.c */ -int btrfs_lookup_extent(struct btrfs_root *root, struct btrfs_path *path, - u64 start, u64 len); +int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); int btrfs_update_pinned_extents(struct btrfs_root *root, u64 bytenr, u64 num, int pin); int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, @@ -1495,10 +1501,9 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, int data, int owner); struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - u32 blocksize, + u32 blocksize, u64 parent, u64 root_objectid, u64 ref_generation, - u64 first_objectid, int level, u64 hint, u64 empty_size); @@ -1508,23 +1513,24 @@ struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size); int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct btrfs_path *path, u64 bytenr, + struct btrfs_path *path, + u64 bytenr, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset); int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, - u64 num_bytes, u64 min_bytes, + u64 num_bytes, u64 parent, u64 min_bytes, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset, u64 empty_size, u64 hint_byte, u64 search_end, struct btrfs_key *ins, u64 data); int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, + struct btrfs_root *root, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset, struct btrfs_key *ins); int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, + struct btrfs_root *root, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset, struct btrfs_key *ins); @@ -1535,9 +1541,16 @@ int btrfs_reserve_extent(struct btrfs_trans_handle *trans, u64 search_end, struct btrfs_key *ins, u64 data); int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct extent_buffer *buf, int cache_ref); -int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root - *root, u64 bytenr, u64 num_bytes, + struct extent_buffer *orig_buf, struct extent_buffer *buf, + u32 *nr_extents); +int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, + struct extent_buffer *buf, u32 nr_extents); +int btrfs_update_ref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct extent_buffer *orig_buf, + struct extent_buffer *buf, int start_slot, int nr); +int btrfs_free_extent(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner_objectid, u64 owner_offset, int pin); int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); @@ -1545,10 +1558,15 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct extent_io_tree *unpin); int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 bytenr, u64 num_bytes, - u64 root_objectid, u64 ref_generation, - u64 owner, u64 owner_offset); + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, + u64 root_objectid, u64 ref_generation, + u64 owner, u64 owner_offset); +int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 bytenr, + u64 orig_parent, u64 parent, + u64 root_objectid, u64 ref_generation, + u64 owner, u64 owner_offset); int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, struct btrfs_root *root); int btrfs_free_block_groups(struct btrfs_fs_info *info); @@ -1561,7 +1579,9 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, int btrfs_previous_item(struct btrfs_root *root, struct btrfs_path *path, u64 min_objectid, int type); - +int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct btrfs_path *path, + struct btrfs_key *new_key); struct extent_buffer *btrfs_root_node(struct btrfs_root *root); struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 25be96946a2f..d35ca6a3f513 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -882,8 +882,8 @@ int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, root->ref_cows = 0; root->node = btrfs_alloc_free_block(trans, root, root->leafsize, - BTRFS_TREE_LOG_OBJECTID, - 0, 0, 0, 0, 0); + 0, BTRFS_TREE_LOG_OBJECTID, + trans->transid, 0, 0, 0); btrfs_set_header_nritems(root->node, 0); btrfs_set_header_level(root->node, 0); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 558fbe407368..5258923d621f 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -29,6 +29,21 @@ #include "locking.h" #include "ref-cache.h" +#define PENDING_EXTENT_INSERT 0 +#define PENDING_EXTENT_DELETE 1 +#define PENDING_BACKREF_UPDATE 2 + +struct pending_extent_op { + int type; + u64 bytenr; + u64 num_bytes; + u64 parent; + u64 orig_parent; + u64 generation; + u64 orig_generation; + int level; +}; + static int finish_current_insert(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root); static int del_pending_extents(struct btrfs_trans_handle *trans, struct @@ -487,48 +502,15 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root, return ret; } -static u64 hash_extent_ref(u64 root_objectid, u64 ref_generation, - u64 owner, u64 owner_offset) -{ - u32 high_crc = ~(u32)0; - u32 low_crc = ~(u32)0; - __le64 lenum; - lenum = cpu_to_le64(root_objectid); - high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); - lenum = cpu_to_le64(ref_generation); - low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); - if (owner >= BTRFS_FIRST_FREE_OBJECTID) { - lenum = cpu_to_le64(owner); - low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); - lenum = cpu_to_le64(owner_offset); - low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); - } - return ((u64)high_crc << 32) | (u64)low_crc; -} - -static int match_extent_ref(struct extent_buffer *leaf, - struct btrfs_extent_ref *disk_ref, - struct btrfs_extent_ref *cpu_ref) -{ - int ret; - int len; - - if (cpu_ref->objectid) - len = sizeof(*cpu_ref); - else - len = 2 * sizeof(u64); - ret = memcmp_extent_buffer(leaf, cpu_ref, (unsigned long)disk_ref, - len); - return ret == 0; -} - /* simple helper to search for an existing extent at a given offset */ -int btrfs_lookup_extent(struct btrfs_root *root, struct btrfs_path *path, - u64 start, u64 len) +int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) { int ret; struct btrfs_key key; + struct btrfs_path *path; + path = btrfs_alloc_path(); + BUG_ON(!path); maybe_lock_mutex(root); key.objectid = start; key.offset = len; @@ -536,72 +518,7 @@ int btrfs_lookup_extent(struct btrfs_root *root, struct btrfs_path *path, ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, 0, 0); maybe_unlock_mutex(root); - return ret; -} - -static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, u64 bytenr, - u64 root_objectid, - u64 ref_generation, u64 owner, - u64 owner_offset, int del) -{ - u64 hash; - struct btrfs_key key; - struct btrfs_key found_key; - struct btrfs_extent_ref ref; - struct extent_buffer *leaf; - struct btrfs_extent_ref *disk_ref; - int ret; - int ret2; - - btrfs_set_stack_ref_root(&ref, root_objectid); - btrfs_set_stack_ref_generation(&ref, ref_generation); - btrfs_set_stack_ref_objectid(&ref, owner); - btrfs_set_stack_ref_offset(&ref, owner_offset); - - hash = hash_extent_ref(root_objectid, ref_generation, owner, - owner_offset); - key.offset = hash; - key.objectid = bytenr; - key.type = BTRFS_EXTENT_REF_KEY; - - while (1) { - ret = btrfs_search_slot(trans, root, &key, path, - del ? -1 : 0, del); - if (ret < 0) - goto out; - leaf = path->nodes[0]; - if (ret != 0) { - u32 nritems = btrfs_header_nritems(leaf); - if (path->slots[0] >= nritems) { - ret2 = btrfs_next_leaf(root, path); - if (ret2) - goto out; - leaf = path->nodes[0]; - } - btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); - if (found_key.objectid != bytenr || - found_key.type != BTRFS_EXTENT_REF_KEY) - goto out; - key.offset = found_key.offset; - if (del) { - btrfs_release_path(root, path); - continue; - } - } - disk_ref = btrfs_item_ptr(path->nodes[0], - path->slots[0], - struct btrfs_extent_ref); - if (match_extent_ref(path->nodes[0], disk_ref, &ref)) { - ret = 0; - goto out; - } - btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); - key.offset = found_key.offset + 1; - btrfs_release_path(root, path); - } -out: + btrfs_free_path(path); return ret; } @@ -622,7 +539,7 @@ out: * File extents can be referenced by: * * - multiple snapshots, subvolumes, or different generations in one subvol - * - different files inside a single subvolume (in theory, not implemented yet) + * - different files inside a single subvolume * - different offsets inside a file (bookend extents in file.c) * * The extent ref structure has fields for: @@ -631,119 +548,284 @@ out: * - Generation number of the tree holding the reference * - objectid of the file holding the reference * - offset in the file corresponding to the key holding the reference + * - number of references holding by parent node (alway 1 for tree blocks) + * + * Btree leaf may hold multiple references to a file extent. In most cases, + * these references are from same file and the corresponding offsets inside + * the file are close together. So inode objectid and offset in file are + * just hints, they provide hints about where in the btree the references + * can be found and when we can stop searching. * * When a file extent is allocated the fields are filled in: - * (root_key.objectid, trans->transid, inode objectid, offset in file) + * (root_key.objectid, trans->transid, inode objectid, offset in file, 1) * * When a leaf is cow'd new references are added for every file extent found - * in the leaf. It looks the same as the create case, but trans->transid - * will be different when the block is cow'd. + * in the leaf. It looks similar to the create case, but trans->transid will + * be different when the block is cow'd. * - * (root_key.objectid, trans->transid, inode objectid, offset in file) + * (root_key.objectid, trans->transid, inode objectid, offset in file, + * number of references in the leaf) * - * When a file extent is removed either during snapshot deletion or file - * truncation, the corresponding back reference is found - * by searching for: + * Because inode objectid and offset in file are just hints, they are not + * used when backrefs are deleted. When a file extent is removed either + * during snapshot deletion or file truncation, we find the corresponding + * back back reference and check the following fields. * - * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), - * inode objectid, offset in file) + * (btrfs_header_owner(leaf), btrfs_header_generation(leaf)) * * Btree extents can be referenced by: * * - Different subvolumes * - Different generations of the same subvolume * - * Storing sufficient information for a full reverse mapping of a btree - * block would require storing the lowest key of the block in the backref, - * and it would require updating that lowest key either before write out or - * every time it changed. Instead, the objectid of the lowest key is stored - * along with the level of the tree block. This provides a hint - * about where in the btree the block can be found. Searches through the - * btree only need to look for a pointer to that block, so they stop one - * level higher than the level recorded in the backref. - * - * Some btrees do not do reference counting on their extents. These - * include the extent tree and the tree of tree roots. Backrefs for these - * trees always have a generation of zero. - * * When a tree block is created, back references are inserted: * - * (root->root_key.objectid, trans->transid or zero, level, lowest_key_objectid) + * (root->root_key.objectid, trans->transid, level, 0, 1) * - * When a tree block is cow'd in a reference counted root, - * new back references are added for all the blocks it points to. - * These are of the form (trans->transid will have increased since creation): + * When a tree block is cow'd, new back references are added for all the + * blocks it points to. If the tree block isn't in reference counted root, + * the old back references are removed. These new back references are of + * the form (trans->transid will have increased since creation): * - * (root->root_key.objectid, trans->transid, level, lowest_key_objectid) + * (root->root_key.objectid, trans->transid, level, 0, 1) * - * Because the lowest_key_objectid and the level are just hints - * they are not used when backrefs are deleted. When a backref is deleted: + * When a backref is in deleting, the following fields are checked: * * if backref was for a tree root: - * root_objectid = root->root_key.objectid + * (btrfs_header_owner(itself), btrfs_header_generation(itself)) * else - * root_objectid = btrfs_header_owner(parent) + * (btrfs_header_owner(parent), btrfs_header_generation(parent)) * - * (root_objectid, btrfs_header_generation(parent) or zero, 0, 0) + * Back Reference Key composing: * - * Back Reference Key hashing: - * - * Back references have four fields, each 64 bits long. Unfortunately, - * This is hashed into a single 64 bit number and placed into the key offset. - * The key objectid corresponds to the first byte in the extent, and the - * key type is set to BTRFS_EXTENT_REF_KEY + * The key objectid corresponds to the first byte in the extent, the key + * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first + * byte of parent extent. If a extent is tree root, the key offset is set + * to the key objectid. */ -int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_path *path, u64 bytenr, - u64 root_objectid, u64 ref_generation, - u64 owner, u64 owner_offset) + +static int noinline lookup_extent_backref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 bytenr, + u64 parent, u64 ref_root, + u64 ref_generation, int del) { - u64 hash; struct btrfs_key key; - struct btrfs_extent_ref ref; - struct btrfs_extent_ref *disk_ref; + struct btrfs_extent_ref *ref; + struct extent_buffer *leaf; int ret; - btrfs_set_stack_ref_root(&ref, root_objectid); - btrfs_set_stack_ref_generation(&ref, ref_generation); - btrfs_set_stack_ref_objectid(&ref, owner); - btrfs_set_stack_ref_offset(&ref, owner_offset); + key.objectid = bytenr; + key.type = BTRFS_EXTENT_REF_KEY; + key.offset = parent; + + ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); + if (ret < 0) + goto out; + if (ret > 0) { + ret = -ENOENT; + goto out; + } + + leaf = path->nodes[0]; + ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); + if (btrfs_ref_root(leaf, ref) != ref_root || + btrfs_ref_generation(leaf, ref) != ref_generation) { + ret = -EIO; + WARN_ON(1); + goto out; + } + ret = 0; +out: + return ret; +} + +static int noinline insert_extent_backref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + u64 bytenr, u64 parent, + u64 ref_root, u64 ref_generation, + u64 owner_objectid, u64 owner_offset) +{ + struct btrfs_key key; + struct extent_buffer *leaf; + struct btrfs_extent_ref *ref; + u32 num_refs; + int ret; - hash = hash_extent_ref(root_objectid, ref_generation, owner, - owner_offset); - key.offset = hash; key.objectid = bytenr; key.type = BTRFS_EXTENT_REF_KEY; + key.offset = parent; - ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(ref)); - while (ret == -EEXIST) { - disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], - struct btrfs_extent_ref); - if (match_extent_ref(path->nodes[0], disk_ref, &ref)) + ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); + if (ret == 0) { + leaf = path->nodes[0]; + ref = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_extent_ref); + btrfs_set_ref_root(leaf, ref, ref_root); + btrfs_set_ref_generation(leaf, ref, ref_generation); + btrfs_set_ref_objectid(leaf, ref, owner_objectid); + btrfs_set_ref_offset(leaf, ref, owner_offset); + btrfs_set_ref_num_refs(leaf, ref, 1); + } else if (ret == -EEXIST) { + u64 existing_owner; + BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); + leaf = path->nodes[0]; + ref = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_extent_ref); + if (btrfs_ref_root(leaf, ref) != ref_root || + btrfs_ref_generation(leaf, ref) != ref_generation) { + ret = -EIO; + WARN_ON(1); goto out; - key.offset++; - btrfs_release_path(root, path); - ret = btrfs_insert_empty_item(trans, root, path, &key, - sizeof(ref)); - } - if (ret) + } + + num_refs = btrfs_ref_num_refs(leaf, ref); + BUG_ON(num_refs == 0); + btrfs_set_ref_num_refs(leaf, ref, num_refs + 1); + + existing_owner = btrfs_ref_objectid(leaf, ref); + if (existing_owner == owner_objectid && + btrfs_ref_offset(leaf, ref) > owner_offset) { + btrfs_set_ref_offset(leaf, ref, owner_offset); + } else if (existing_owner != owner_objectid && + existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { + btrfs_set_ref_objectid(leaf, ref, + BTRFS_MULTIPLE_OBJECTIDS); + btrfs_set_ref_offset(leaf, ref, 0); + } + ret = 0; + } else { goto out; - disk_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], - struct btrfs_extent_ref); - write_extent_buffer(path->nodes[0], &ref, (unsigned long)disk_ref, - sizeof(ref)); + } btrfs_mark_buffer_dirty(path->nodes[0]); out: btrfs_release_path(root, path); return ret; } +static int noinline remove_extent_backref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path) +{ + struct extent_buffer *leaf; + struct btrfs_extent_ref *ref; + u32 num_refs; + int ret = 0; + + leaf = path->nodes[0]; + ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); + num_refs = btrfs_ref_num_refs(leaf, ref); + BUG_ON(num_refs == 0); + num_refs -= 1; + if (num_refs == 0) { + ret = btrfs_del_item(trans, root, path); + } else { + btrfs_set_ref_num_refs(leaf, ref, num_refs); + btrfs_mark_buffer_dirty(leaf); + } + btrfs_release_path(root, path); + return ret; +} + +static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 bytenr, + u64 orig_parent, u64 parent, + u64 orig_root, u64 ref_root, + u64 orig_generation, u64 ref_generation, + u64 owner_objectid, u64 owner_offset) +{ + int ret; + struct btrfs_root *extent_root = root->fs_info->extent_root; + struct btrfs_path *path; + + if (root == root->fs_info->extent_root) { + struct pending_extent_op *extent_op; + u64 num_bytes; + + BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL); + num_bytes = btrfs_level_size(root, (int)owner_objectid); + if (test_range_bit(&root->fs_info->extent_ins, bytenr, + bytenr + num_bytes - 1, EXTENT_LOCKED, 0)) { + u64 priv; + ret = get_state_private(&root->fs_info->extent_ins, + bytenr, &priv); + BUG_ON(ret); + extent_op = (struct pending_extent_op *) + (unsigned long)priv; + BUG_ON(extent_op->parent != orig_parent); + BUG_ON(extent_op->generation != orig_generation); + extent_op->parent = parent; + extent_op->generation = ref_generation; + } else { + extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); + BUG_ON(!extent_op); + + extent_op->type = PENDING_BACKREF_UPDATE; + extent_op->bytenr = bytenr; + extent_op->num_bytes = num_bytes; + extent_op->parent = parent; + extent_op->orig_parent = orig_parent; + extent_op->generation = ref_generation; + extent_op->orig_generation = orig_generation; + extent_op->level = (int)owner_objectid; + + set_extent_bits(&root->fs_info->extent_ins, + bytenr, bytenr + num_bytes - 1, + EXTENT_LOCKED, GFP_NOFS); + set_state_private(&root->fs_info->extent_ins, + bytenr, (unsigned long)extent_op); + } + return 0; + } + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + ret = lookup_extent_backref(trans, extent_root, path, + bytenr, orig_parent, orig_root, + orig_generation, 1); + if (ret) + goto out; + ret = remove_extent_backref(trans, extent_root, path); + if (ret) + goto out; + ret = insert_extent_backref(trans, extent_root, path, bytenr, + parent, ref_root, ref_generation, + owner_objectid, owner_offset); + BUG_ON(ret); + finish_current_insert(trans, extent_root); + del_pending_extents(trans, extent_root); +out: + btrfs_free_path(path); + return ret; +} + +int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 bytenr, + u64 orig_parent, u64 parent, + u64 ref_root, u64 ref_generation, + u64 owner_objectid, u64 owner_offset) +{ + int ret; + if (ref_root == BTRFS_TREE_LOG_OBJECTID && + owner_objectid < BTRFS_FIRST_FREE_OBJECTID) + return 0; + maybe_lock_mutex(root); + ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent, + parent, ref_root, ref_root, + ref_generation, ref_generation, + owner_objectid, owner_offset); + maybe_unlock_mutex(root); + return ret; +} + static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 bytenr, u64 num_bytes, - u64 root_objectid, u64 ref_generation, - u64 owner, u64 owner_offset) + struct btrfs_root *root, u64 bytenr, + u64 orig_parent, u64 parent, + u64 orig_root, u64 ref_root, + u64 orig_generation, u64 ref_generation, + u64 owner_objectid, u64 owner_offset) { struct btrfs_path *path; int ret; @@ -752,24 +834,28 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, struct btrfs_extent_item *item; u32 refs; - WARN_ON(num_bytes < root->sectorsize); path = btrfs_alloc_path(); if (!path) return -ENOMEM; path->reada = 1; key.objectid = bytenr; - btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); - key.offset = num_bytes; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = (u64)-1; + ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, 0, 1); if (ret < 0) return ret; - if (ret != 0) { - BUG(); - } - BUG_ON(ret != 0); + BUG_ON(ret == 0 || path->slots[0] == 0); + + path->slots[0]--; l = path->nodes[0]; + + btrfs_item_key_to_cpu(l, &key, path->slots[0]); + BUG_ON(key.objectid != bytenr); + BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); + item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); refs = btrfs_extent_refs(l, item); btrfs_set_extent_refs(l, item, refs + 1); @@ -778,9 +864,10 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, btrfs_release_path(root->fs_info->extent_root, path); path->reada = 1; - ret = btrfs_insert_extent_backref(trans, root->fs_info->extent_root, - path, bytenr, root_objectid, - ref_generation, owner, owner_offset); + ret = insert_extent_backref(trans, root->fs_info->extent_root, + path, bytenr, parent, + ref_root, ref_generation, + owner_objectid, owner_offset); BUG_ON(ret); finish_current_insert(trans, root->fs_info->extent_root); del_pending_extents(trans, root->fs_info->extent_root); @@ -790,18 +877,20 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, } int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 bytenr, u64 num_bytes, - u64 root_objectid, u64 ref_generation, - u64 owner, u64 owner_offset) + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, + u64 ref_root, u64 ref_generation, + u64 owner_objectid, u64 owner_offset) { int ret; - - mutex_lock(&root->fs_info->alloc_mutex); - ret = __btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, - root_objectid, ref_generation, - owner, owner_offset); - mutex_unlock(&root->fs_info->alloc_mutex); + if (ref_root == BTRFS_TREE_LOG_OBJECTID && + owner_objectid < BTRFS_FIRST_FREE_OBJECTID) + return 0; + maybe_lock_mutex(root); + ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent, + 0, ref_root, 0, ref_generation, + owner_objectid, owner_offset); + maybe_unlock_mutex(root); return ret; } @@ -813,9 +902,9 @@ int btrfs_extent_post_op(struct btrfs_trans_handle *trans, return 0; } -static int lookup_extent_ref(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 bytenr, - u64 num_bytes, u32 *refs) +int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, u64 bytenr, + u64 num_bytes, u32 *refs) { struct btrfs_path *path; int ret; @@ -846,7 +935,6 @@ out: return 0; } - static int get_reference_status(struct btrfs_root *root, u64 bytenr, u64 parent_gen, u64 ref_objectid, u64 *min_generation, u32 *ref_count) @@ -863,7 +951,7 @@ static int get_reference_status(struct btrfs_root *root, u64 bytenr, int ret; key.objectid = bytenr; - key.offset = 0; + key.offset = (u64)-1; key.type = BTRFS_EXTENT_ITEM_KEY; path = btrfs_alloc_path(); @@ -872,7 +960,10 @@ static int get_reference_status(struct btrfs_root *root, u64 bytenr, if (ret < 0) goto out; BUG_ON(ret == 0); + if (ret < 0 || path->slots[0] == 0) + goto out; + path->slots[0]--; leaf = path->nodes[0]; btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); @@ -909,7 +1000,7 @@ static int get_reference_status(struct btrfs_root *root, u64 bytenr, struct btrfs_extent_ref); ref_generation = btrfs_ref_generation(leaf, ref_item); /* - * For (parent_gen > 0 && parent_gen > ref_gen): + * For (parent_gen > 0 && parent_gen > ref_generation): * * we reach here through the oldest root, therefore * all other reference from same snapshot should have @@ -919,8 +1010,7 @@ static int get_reference_status(struct btrfs_root *root, u64 bytenr, (parent_gen > 0 && parent_gen > ref_generation) || (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID && ref_objectid != btrfs_ref_objectid(leaf, ref_item))) { - if (ref_count) - *ref_count = 2; + *ref_count = 2; break; } @@ -1020,80 +1110,29 @@ out: return ret; } -int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, - struct extent_buffer *buf, int cache_ref) +int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, + struct extent_buffer *buf, u32 nr_extents) { - u64 bytenr; u32 nritems; struct btrfs_key key; struct btrfs_file_extent_item *fi; int i; int level; - int ret; - int faili; - int nr_file_extents = 0; + int ret = 0; if (!root->ref_cows) return 0; level = btrfs_header_level(buf); nritems = btrfs_header_nritems(buf); - for (i = 0; i < nritems; i++) { - cond_resched(); - if (level == 0) { - u64 disk_bytenr; - btrfs_item_key_to_cpu(buf, &key, i); - if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) - continue; - fi = btrfs_item_ptr(buf, i, - struct btrfs_file_extent_item); - if (btrfs_file_extent_type(buf, fi) == - BTRFS_FILE_EXTENT_INLINE) - continue; - disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); - if (disk_bytenr == 0) - continue; - - if (buf != root->commit_root) - nr_file_extents++; - - mutex_lock(&root->fs_info->alloc_mutex); - ret = __btrfs_inc_extent_ref(trans, root, disk_bytenr, - btrfs_file_extent_disk_num_bytes(buf, fi), - root->root_key.objectid, trans->transid, - key.objectid, key.offset); - mutex_unlock(&root->fs_info->alloc_mutex); - if (ret) { - faili = i; - WARN_ON(1); - goto fail; - } - } else { - bytenr = btrfs_node_blockptr(buf, i); - btrfs_node_key_to_cpu(buf, &key, i); - mutex_lock(&root->fs_info->alloc_mutex); - ret = __btrfs_inc_extent_ref(trans, root, bytenr, - btrfs_level_size(root, level - 1), - root->root_key.objectid, - trans->transid, - level - 1, key.objectid); - mutex_unlock(&root->fs_info->alloc_mutex); - if (ret) { - faili = i; - WARN_ON(1); - goto fail; - } - } - } - /* cache orignal leaf block's references */ - if (level == 0 && cache_ref && buf != root->commit_root) { + if (level == 0) { struct btrfs_leaf_ref *ref; struct btrfs_extent_info *info; - ref = btrfs_alloc_leaf_ref(root, nr_file_extents); + ref = btrfs_alloc_leaf_ref(root, nr_extents); if (!ref) { - WARN_ON(1); + ret = -ENOMEM; goto out; } @@ -1101,10 +1140,10 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, ref->bytenr = buf->start; ref->owner = btrfs_header_owner(buf); ref->generation = btrfs_header_generation(buf); - ref->nritems = nr_file_extents; + ref->nritems = nr_extents; info = ref->extents; - for (i = 0; nr_file_extents > 0 && i < nritems; i++) { + for (i = 0; nr_extents > 0 && i < nritems; i++) { u64 disk_bytenr; btrfs_item_key_to_cpu(buf, &key, i); if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) @@ -1132,13 +1171,52 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, btrfs_free_leaf_ref(root, ref); } out: - return 0; -fail: - WARN_ON(1); -#if 0 - for (i =0; i < faili; i++) { + return ret; +} + +int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, + struct extent_buffer *orig_buf, struct extent_buffer *buf, + u32 *nr_extents) +{ + u64 bytenr; + u64 ref_root; + u64 orig_root; + u64 ref_generation; + u64 orig_generation; + u32 nritems; + u32 nr_file_extents = 0; + struct btrfs_key key; + struct btrfs_file_extent_item *fi; + int i; + int level; + int ret = 0; + int faili = 0; + int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, + u64, u64, u64, u64, u64, u64, u64, u64, u64); + + ref_root = btrfs_header_owner(buf); + ref_generation = btrfs_header_generation(buf); + orig_root = btrfs_header_owner(orig_buf); + orig_generation = btrfs_header_generation(orig_buf); + + nritems = btrfs_header_nritems(buf); + level = btrfs_header_level(buf); + + if (root->ref_cows) { + process_func = __btrfs_inc_extent_ref; + } else { + if (level == 0 && + root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) + goto out; + if (level != 0 && + root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) + goto out; + process_func = __btrfs_update_extent_ref; + } + + for (i = 0; i < nritems; i++) { + cond_resched(); if (level == 0) { - u64 disk_bytenr; btrfs_item_key_to_cpu(buf, &key, i); if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) continue; @@ -1147,24 +1225,131 @@ fail: if (btrfs_file_extent_type(buf, fi) == BTRFS_FILE_EXTENT_INLINE) continue; - disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); - if (disk_bytenr == 0) + bytenr = btrfs_file_extent_disk_bytenr(buf, fi); + if (bytenr == 0) continue; - err = btrfs_free_extent(trans, root, disk_bytenr, - btrfs_file_extent_disk_num_bytes(buf, - fi), 0); - BUG_ON(err); + + nr_file_extents++; + + maybe_lock_mutex(root); + ret = process_func(trans, root, bytenr, + orig_buf->start, buf->start, + orig_root, ref_root, + orig_generation, ref_generation, + key.objectid, key.offset); + maybe_unlock_mutex(root); + + if (ret) { + faili = i; + WARN_ON(1); + goto fail; + } } else { bytenr = btrfs_node_blockptr(buf, i); - err = btrfs_free_extent(trans, root, bytenr, - btrfs_level_size(root, level - 1), 0); - BUG_ON(err); + maybe_lock_mutex(root); + ret = process_func(trans, root, bytenr, + orig_buf->start, buf->start, + orig_root, ref_root, + orig_generation, ref_generation, + level - 1, 0); + maybe_unlock_mutex(root); + if (ret) { + faili = i; + WARN_ON(1); + goto fail; + } } } -#endif +out: + if (nr_extents) { + if (level == 0) + *nr_extents = nr_file_extents; + else + *nr_extents = nritems; + } + return 0; +fail: + WARN_ON(1); return ret; } +int btrfs_update_ref(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct extent_buffer *orig_buf, + struct extent_buffer *buf, int start_slot, int nr) + +{ + u64 bytenr; + u64 ref_root; + u64 orig_root; + u64 ref_generation; + u64 orig_generation; + struct btrfs_key key; + struct btrfs_file_extent_item *fi; + int i; + int ret; + int slot; + int level; + + BUG_ON(start_slot < 0); + BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); + + ref_root = btrfs_header_owner(buf); + ref_generation = btrfs_header_generation(buf); + orig_root = btrfs_header_owner(orig_buf); + orig_generation = btrfs_header_generation(orig_buf); + level = btrfs_header_level(buf); + + if (!root->ref_cows) { + if (level == 0 && + root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) + return 0; + if (level != 0 && + root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) + return 0; + } + + for (i = 0, slot = start_slot; i < nr; i++, slot++) { + cond_resched(); + if (level == 0) { + btrfs_item_key_to_cpu(buf, &key, slot); + if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) + continue; + fi = btrfs_item_ptr(buf, slot, + struct btrfs_file_extent_item); + if (btrfs_file_extent_type(buf, fi) == + BTRFS_FILE_EXTENT_INLINE) + continue; + bytenr = btrfs_file_extent_disk_bytenr(buf, fi); + if (bytenr == 0) + continue; + maybe_lock_mutex(root); + ret = __btrfs_update_extent_ref(trans, root, bytenr, + orig_buf->start, buf->start, + orig_root, ref_root, + orig_generation, ref_generation, + key.objectid, key.offset); + maybe_unlock_mutex(root); + if (ret) + goto fail; + } else { + bytenr = btrfs_node_blockptr(buf, slot); + maybe_lock_mutex(root); + ret = __btrfs_update_extent_ref(trans, root, bytenr, + orig_buf->start, buf->start, + orig_root, ref_root, + orig_generation, ref_generation, + level - 1, 0); + maybe_unlock_mutex(root); + if (ret) + goto fail; + } + } + return 0; +fail: + WARN_ON(1); + return -1; +} + static int write_one_cache_group(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, @@ -1539,19 +1724,18 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, { u64 start; u64 end; + u64 priv; struct btrfs_fs_info *info = extent_root->fs_info; - struct extent_buffer *eb; struct btrfs_path *path; - struct btrfs_key ins; - struct btrfs_disk_key first; + struct btrfs_extent_ref *ref; + struct pending_extent_op *extent_op; + struct btrfs_key key; struct btrfs_extent_item extent_item; int ret; - int level; int err = 0; WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex)); btrfs_set_stack_extent_refs(&extent_item, 1); - btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); path = btrfs_alloc_path(); while(1) { @@ -1560,37 +1744,54 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, if (ret) break; - ins.objectid = start; - ins.offset = end + 1 - start; - err = btrfs_insert_item(trans, extent_root, &ins, + ret = get_state_private(&info->extent_ins, start, &priv); + BUG_ON(ret); + extent_op = (struct pending_extent_op *)(unsigned long)priv; + + if (extent_op->type == PENDING_EXTENT_INSERT) { + key.objectid = start; + key.offset = end + 1 - start; + key.type = BTRFS_EXTENT_ITEM_KEY; + err = btrfs_insert_item(trans, extent_root, &key, &extent_item, sizeof(extent_item)); - clear_extent_bits(&info->extent_ins, start, end, EXTENT_LOCKED, - GFP_NOFS); + BUG_ON(err); - eb = btrfs_find_create_tree_block(extent_root, ins.objectid, - ins.offset); + clear_extent_bits(&info->extent_ins, start, end, + EXTENT_LOCKED, GFP_NOFS); - if (!btrfs_buffer_uptodate(eb, trans->transid)) - btrfs_read_buffer(eb, trans->transid); + err = insert_extent_backref(trans, extent_root, path, + start, extent_op->parent, + extent_root->root_key.objectid, + extent_op->generation, + extent_op->level, 0); + BUG_ON(err); + } else if (extent_op->type == PENDING_BACKREF_UPDATE) { + err = lookup_extent_backref(trans, extent_root, path, + start, extent_op->orig_parent, + extent_root->root_key.objectid, + extent_op->orig_generation, 0); + BUG_ON(err); - btrfs_tree_lock(eb); - level = btrfs_header_level(eb); - if (level == 0) { - btrfs_item_key(eb, &first, 0); + clear_extent_bits(&info->extent_ins, start, end, + EXTENT_LOCKED, GFP_NOFS); + + key.objectid = start; + key.offset = extent_op->parent; + key.type = BTRFS_EXTENT_REF_KEY; + err = btrfs_set_item_key_safe(trans, extent_root, path, + &key); + BUG_ON(err); + ref = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_extent_ref); + btrfs_set_ref_generation(path->nodes[0], ref, + extent_op->generation); + btrfs_mark_buffer_dirty(path->nodes[0]); + btrfs_release_path(extent_root, path); } else { - btrfs_node_key(eb, &first, 0); + BUG_ON(1); } - btrfs_tree_unlock(eb); - free_extent_buffer(eb); - /* - * the first key is just a hint, so the race we've created - * against reading it is fine - */ - err = btrfs_insert_extent_backref(trans, extent_root, path, - start, extent_root->root_key.objectid, - 0, level, - btrfs_disk_key_objectid(&first)); - BUG_ON(err); + kfree(extent_op); + if (need_resched()) { mutex_unlock(&extent_root->fs_info->alloc_mutex); cond_resched(); @@ -1601,52 +1802,44 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, return 0; } -static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes, - int is_data, int pending) +static int pin_down_bytes(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, int is_data) { int err = 0; + struct extent_buffer *buf; WARN_ON(!mutex_is_locked(&root->fs_info->alloc_mutex)); - if (!pending) { - struct extent_buffer *buf; - - if (is_data) - goto pinit; - - buf = btrfs_find_tree_block(root, bytenr, num_bytes); - if (buf) { - /* 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 transid = - root->fs_info->running_transaction->transid; - u64 header_transid = - btrfs_header_generation(buf); - if (btrfs_header_owner(buf) != - BTRFS_TREE_LOG_OBJECTID && - header_transid == transid && - !btrfs_header_flag(buf, - BTRFS_HEADER_FLAG_WRITTEN)) { - clean_tree_block(NULL, root, buf); - btrfs_tree_unlock(buf); - free_extent_buffer(buf); - return 1; - } - btrfs_tree_unlock(buf); - } + if (is_data) + 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)) { + clean_tree_block(NULL, root, buf); + btrfs_tree_unlock(buf); free_extent_buffer(buf); + return 1; } -pinit: - btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); - } else { - set_extent_bits(&root->fs_info->pending_del, - bytenr, bytenr + num_bytes - 1, - EXTENT_LOCKED, GFP_NOFS); + btrfs_tree_unlock(buf); } + free_extent_buffer(buf); +pinit: + btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); + BUG_ON(err < 0); return 0; } @@ -1654,11 +1847,12 @@ pinit: /* * remove an extent from the root, returns 0 on success */ -static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root - *root, u64 bytenr, u64 num_bytes, +static int __free_extent(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, u64 ref_generation, - u64 owner_objectid, u64 owner_offset, int pin, - int mark_free) + u64 owner_objectid, u64 owner_offset, + int pin, int mark_free) { struct btrfs_path *path; struct btrfs_key key; @@ -1681,10 +1875,8 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root return -ENOMEM; path->reada = 1; - ret = lookup_extent_backref(trans, extent_root, path, - bytenr, root_objectid, - ref_generation, - owner_objectid, owner_offset, 1); + ret = lookup_extent_backref(trans, extent_root, path, bytenr, parent, + root_objectid, ref_generation, 1); if (ret == 0) { struct btrfs_key found_key; extent_slot = path->slots[0]; @@ -1702,8 +1894,15 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root if (path->slots[0] - extent_slot > 5) break; } - if (!found_extent) - ret = btrfs_del_item(trans, extent_root, path); + if (!found_extent) { + ret = remove_extent_backref(trans, extent_root, path); + BUG_ON(ret); + btrfs_release_path(extent_root, path); + ret = btrfs_search_slot(trans, extent_root, + &key, path, -1, 1); + BUG_ON(ret); + extent_slot = path->slots[0]; + } } else { btrfs_print_leaf(extent_root, path->nodes[0]); WARN_ON(1); @@ -1712,14 +1911,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root root_objectid, ref_generation, owner_objectid, owner_offset); } - if (!found_extent) { - btrfs_release_path(extent_root, path); - ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); - if (ret < 0) - return ret; - BUG_ON(ret); - extent_slot = path->slots[0]; - } leaf = path->nodes[0]; ei = btrfs_item_ptr(leaf, extent_slot, @@ -1732,6 +1923,10 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_mark_buffer_dirty(leaf); if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { + struct btrfs_extent_ref *ref; + ref = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_extent_ref); + BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1); /* if the back ref and the extent are next to each other * they get deleted below in one shot */ @@ -1739,15 +1934,13 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root num_to_del = 2; } else if (found_extent) { /* otherwise delete the extent back ref */ - ret = btrfs_del_item(trans, extent_root, path); + ret = remove_extent_backref(trans, extent_root, path); BUG_ON(ret); /* if refs are 0, we need to setup the path for deletion */ if (refs == 0) { btrfs_release_path(extent_root, path); ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); - if (ret < 0) - return ret; BUG_ON(ret); } } @@ -1761,8 +1954,8 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root #endif if (pin) { - ret = pin_down_bytes(root, bytenr, num_bytes, - owner_objectid >= BTRFS_FIRST_FREE_OBJECTID, 0); + ret = pin_down_bytes(trans, root, bytenr, num_bytes, + owner_objectid >= BTRFS_FIRST_FREE_OBJECTID); if (ret > 0) mark_free = 1; BUG_ON(ret < 0); @@ -1781,9 +1974,7 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root root_used - num_bytes); ret = btrfs_del_items(trans, extent_root, path, path->slots[0], num_to_del); - if (ret) { - return ret; - } + BUG_ON(ret); ret = update_block_group(trans, root, bytenr, num_bytes, 0, mark_free); BUG_ON(ret); @@ -1822,33 +2013,61 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct { int ret; int err = 0; + int mark_free = 0; u64 start; u64 end; + u64 priv; struct extent_io_tree *pending_del; - struct extent_io_tree *pinned_extents; + struct extent_io_tree *extent_ins; + struct pending_extent_op *extent_op; WARN_ON(!mutex_is_locked(&extent_root->fs_info->alloc_mutex)); + extent_ins = &extent_root->fs_info->extent_ins; pending_del = &extent_root->fs_info->pending_del; - pinned_extents = &extent_root->fs_info->pinned_extents; while(1) { ret = find_first_extent_bit(pending_del, 0, &start, &end, EXTENT_LOCKED); if (ret) break; + + ret = get_state_private(pending_del, start, &priv); + BUG_ON(ret); + extent_op = (struct pending_extent_op *)(unsigned long)priv; + clear_extent_bits(pending_del, start, end, EXTENT_LOCKED, GFP_NOFS); - if (!test_range_bit(&extent_root->fs_info->extent_ins, - start, end, EXTENT_LOCKED, 0)) { - btrfs_update_pinned_extents(extent_root, start, - end + 1 - start, 1); + + ret = pin_down_bytes(trans, extent_root, start, + end + 1 - start, 0); + mark_free = ret > 0; + if (!test_range_bit(extent_ins, start, end, + EXTENT_LOCKED, 0)) { +free_extent: ret = __free_extent(trans, extent_root, - start, end + 1 - start, - extent_root->root_key.objectid, - 0, 0, 0, 0, 0); + start, end + 1 - start, + extent_op->orig_parent, + extent_root->root_key.objectid, + extent_op->orig_generation, + extent_op->level, 0, 0, mark_free); + kfree(extent_op); } else { - clear_extent_bits(&extent_root->fs_info->extent_ins, - start, end, EXTENT_LOCKED, GFP_NOFS); + kfree(extent_op); + ret = get_state_private(extent_ins, start, &priv); + BUG_ON(ret); + extent_op = (struct pending_extent_op *) + (unsigned long)priv; + + clear_extent_bits(extent_ins, start, end, + EXTENT_LOCKED, GFP_NOFS); + + if (extent_op->type == PENDING_BACKREF_UPDATE) + goto free_extent; + + ret = update_block_group(trans, extent_root, start, + end + 1 - start, 0, mark_free); + BUG_ON(ret); + kfree(extent_op); } if (ret) err = ret; @@ -1866,21 +2085,36 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct * remove an extent from the root, returns 0 on success */ static int __btrfs_free_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 bytenr, - u64 num_bytes, u64 root_objectid, - u64 ref_generation, u64 owner_objectid, - u64 owner_offset, int pin) + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, + u64 root_objectid, u64 ref_generation, + u64 owner_objectid, u64 owner_offset, int pin) { struct btrfs_root *extent_root = root->fs_info->extent_root; int pending_ret; int ret; WARN_ON(num_bytes < root->sectorsize); - if (!root->ref_cows) - ref_generation = 0; - if (root == extent_root) { - pin_down_bytes(root, bytenr, num_bytes, 0, 1); + struct pending_extent_op *extent_op; + + extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); + BUG_ON(!extent_op); + + extent_op->type = PENDING_EXTENT_DELETE; + extent_op->bytenr = bytenr; + extent_op->num_bytes = num_bytes; + extent_op->parent = parent; + extent_op->orig_parent = parent; + extent_op->generation = ref_generation; + extent_op->orig_generation = ref_generation; + extent_op->level = (int)owner_objectid; + + set_extent_bits(&root->fs_info->pending_del, + bytenr, bytenr + num_bytes - 1, + EXTENT_LOCKED, GFP_NOFS); + set_state_private(&root->fs_info->pending_del, + bytenr, (unsigned long)extent_op); return 0; } /* if metadata always pin */ @@ -1901,9 +2135,9 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans, if (ref_generation != trans->transid) pin = 1; - ret = __free_extent(trans, root, bytenr, num_bytes, root_objectid, - ref_generation, owner_objectid, owner_offset, - pin, pin == 0); + ret = __free_extent(trans, root, bytenr, num_bytes, parent, + root_objectid, ref_generation, owner_objectid, + owner_offset, pin, pin == 0); finish_current_insert(trans, root->fs_info->extent_root); pending_ret = del_pending_extents(trans, root->fs_info->extent_root); @@ -1911,15 +2145,15 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans, } int btrfs_free_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 bytenr, - u64 num_bytes, u64 root_objectid, - u64 ref_generation, u64 owner_objectid, - u64 owner_offset, int pin) + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, + u64 root_objectid, u64 ref_generation, + u64 owner_objectid, u64 owner_offset, int pin) { int ret; maybe_lock_mutex(root); - ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, + ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent, root_objectid, ref_generation, owner_objectid, owner_offset, pin); maybe_unlock_mutex(root); @@ -2271,7 +2505,7 @@ int btrfs_reserve_extent(struct btrfs_trans_handle *trans, } static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, + struct btrfs_root *root, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset, struct btrfs_key *ins) @@ -2289,6 +2523,9 @@ static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, struct btrfs_path *path; struct btrfs_key keys[2]; + if (parent == 0) + parent = ins->objectid; + /* block accounting for super block */ spin_lock_irq(&info->delalloc_lock); super_used = btrfs_super_bytes_used(&info->super_copy); @@ -2300,17 +2537,32 @@ static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, btrfs_set_root_used(&root->root_item, root_used + num_bytes); if (root == extent_root) { + struct pending_extent_op *extent_op; + + extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); + BUG_ON(!extent_op); + + extent_op->type = PENDING_EXTENT_INSERT; + extent_op->bytenr = ins->objectid; + extent_op->num_bytes = ins->offset; + extent_op->parent = parent; + extent_op->orig_parent = 0; + extent_op->generation = ref_generation; + extent_op->orig_generation = 0; + extent_op->level = (int)owner; + set_extent_bits(&root->fs_info->extent_ins, ins->objectid, ins->objectid + ins->offset - 1, EXTENT_LOCKED, GFP_NOFS); + set_state_private(&root->fs_info->extent_ins, + ins->objectid, (unsigned long)extent_op); goto update_block; } memcpy(&keys[0], ins, sizeof(*ins)); - keys[1].offset = hash_extent_ref(root_objectid, ref_generation, - owner, owner_offset); keys[1].objectid = ins->objectid; keys[1].type = BTRFS_EXTENT_REF_KEY; + keys[1].offset = parent; sizes[0] = sizeof(*extent_item); sizes[1] = sizeof(*ref); @@ -2331,6 +2583,7 @@ static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); btrfs_set_ref_objectid(path->nodes[0], ref, owner); btrfs_set_ref_offset(path->nodes[0], ref, owner_offset); + btrfs_set_ref_num_refs(path->nodes[0], ref, 1); btrfs_mark_buffer_dirty(path->nodes[0]); @@ -2359,7 +2612,7 @@ out: } int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, + struct btrfs_root *root, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset, struct btrfs_key *ins) @@ -2369,9 +2622,9 @@ int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, if (root_objectid == BTRFS_TREE_LOG_OBJECTID) return 0; maybe_lock_mutex(root); - ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid, - ref_generation, owner, - owner_offset, ins); + ret = __btrfs_alloc_reserved_extent(trans, root, parent, + root_objectid, ref_generation, + owner, owner_offset, ins); maybe_unlock_mutex(root); return ret; } @@ -2382,7 +2635,7 @@ int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, * space cache bits as well */ int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, + struct btrfs_root *root, u64 parent, u64 root_objectid, u64 ref_generation, u64 owner, u64 owner_offset, struct btrfs_key *ins) @@ -2396,10 +2649,9 @@ int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, ret = btrfs_remove_free_space(block_group, ins->objectid, ins->offset); BUG_ON(ret); - - ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid, - ref_generation, owner, - owner_offset, ins); + ret = __btrfs_alloc_reserved_extent(trans, root, parent, + root_objectid, ref_generation, + owner, owner_offset, ins); maybe_unlock_mutex(root); return ret; } @@ -2413,9 +2665,9 @@ int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, */ int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, - u64 num_bytes, u64 min_alloc_size, + u64 num_bytes, u64 parent, u64 min_alloc_size, u64 root_objectid, u64 ref_generation, - u64 owner, u64 owner_offset, + u64 owner_objectid, u64 owner_offset, u64 empty_size, u64 hint_byte, u64 search_end, struct btrfs_key *ins, u64 data) { @@ -2428,9 +2680,9 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans, search_end, ins, data); BUG_ON(ret); if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { - ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid, - ref_generation, owner, - owner_offset, ins); + ret = __btrfs_alloc_reserved_extent(trans, root, parent, + root_objectid, ref_generation, + owner_objectid, owner_offset, ins); BUG_ON(ret); } @@ -2468,10 +2720,9 @@ struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, */ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, - u32 blocksize, + u32 blocksize, u64 parent, u64 root_objectid, u64 ref_generation, - u64 first_objectid, int level, u64 hint, u64 empty_size) @@ -2480,10 +2731,9 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, int ret; struct extent_buffer *buf; - ret = btrfs_alloc_extent(trans, root, blocksize, blocksize, - root_objectid, ref_generation, - level, first_objectid, empty_size, hint, - (u64)-1, &ins, 0); + ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, + root_objectid, ref_generation, level, 0, + empty_size, hint, (u64)-1, &ins, 0); if (ret) { BUG_ON(ret > 0); return ERR_PTR(ret); @@ -2531,15 +2781,14 @@ int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, mutex_lock(&root->fs_info->alloc_mutex); ret = __btrfs_free_extent(trans, root, disk_bytenr, btrfs_file_extent_disk_num_bytes(leaf, fi), - leaf_owner, leaf_generation, + leaf->start, leaf_owner, leaf_generation, key.objectid, key.offset, 0); mutex_unlock(&root->fs_info->alloc_mutex); + BUG_ON(ret); atomic_inc(&root->fs_info->throttle_gen); wake_up(&root->fs_info->transaction_throttle); cond_resched(); - - BUG_ON(ret); } return 0; } @@ -2554,10 +2803,10 @@ static int noinline cache_drop_leaf_ref(struct btrfs_trans_handle *trans, for (i = 0; i < ref->nritems; i++) { mutex_lock(&root->fs_info->alloc_mutex); - ret = __btrfs_free_extent(trans, root, - info->bytenr, info->num_bytes, - ref->owner, ref->generation, - info->objectid, info->offset, 0); + ret = __btrfs_free_extent(trans, root, info->bytenr, + info->num_bytes, ref->bytenr, + ref->owner, ref->generation, + info->objectid, info->offset, 0); mutex_unlock(&root->fs_info->alloc_mutex); atomic_inc(&root->fs_info->throttle_gen); @@ -2576,7 +2825,7 @@ int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, u64 len, { int ret; - ret = lookup_extent_ref(NULL, root, start, len, refs); + ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs); BUG_ON(ret); #if 0 // some debugging code in case we see problems here @@ -2672,8 +2921,8 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans, mutex_lock(&root->fs_info->alloc_mutex); ret = __btrfs_free_extent(trans, root, bytenr, - blocksize, root_owner, - root_gen, 0, 0, 1); + blocksize, parent->start, + root_owner, root_gen, 0, 0, 1); BUG_ON(ret); mutex_unlock(&root->fs_info->alloc_mutex); @@ -2690,8 +2939,6 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans, * So, we don't need to check it again */ if (*level == 1) { - struct btrfs_key key; - btrfs_node_key_to_cpu(cur, &key, path->slots[*level]); ref = btrfs_lookup_leaf_ref(root, bytenr); if (ref) { ret = cache_drop_leaf_ref(trans, root, ref); @@ -2750,12 +2997,13 @@ out: mutex_lock(&root->fs_info->alloc_mutex); ret = __btrfs_free_extent(trans, root, bytenr, blocksize, - root_owner, root_gen, 0, 0, 1); + parent->start, root_owner, root_gen, + 0, 0, 1); + mutex_unlock(&root->fs_info->alloc_mutex); free_extent_buffer(path->nodes[*level]); path->nodes[*level] = NULL; *level += 1; BUG_ON(ret); - mutex_unlock(&root->fs_info->alloc_mutex); cond_resched(); return 0; @@ -2792,19 +3040,18 @@ static int noinline walk_up_tree(struct btrfs_trans_handle *trans, root_item->drop_level = i; return 0; } else { - if (path->nodes[*level] == root->node) { - root_owner = root->root_key.objectid; - root_gen = - btrfs_header_generation(path->nodes[*level]); - } else { - struct extent_buffer *node; - node = path->nodes[*level + 1]; - root_owner = btrfs_header_owner(node); - root_gen = btrfs_header_generation(node); - } + struct extent_buffer *parent; + if (path->nodes[*level] == root->node) + parent = path->nodes[*level]; + else + parent = path->nodes[*level + 1]; + + root_owner = btrfs_header_owner(parent); + root_gen = btrfs_header_generation(parent); ret = btrfs_free_extent(trans, root, path->nodes[*level]->start, path->nodes[*level]->len, + parent->start, root_owner, root_gen, 0, 0, 1); BUG_ON(ret); free_extent_buffer(path->nodes[*level]); diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 8624f3e88036..58ad25838a41 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2201,9 +2201,10 @@ retry: } if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) mapping->writeback_index = index; - +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) if (wbc->range_cont) wbc->range_start = index << PAGE_CACHE_SHIFT; +#endif return ret; } EXPORT_SYMBOL(extent_write_cache_pages); diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 58b329ddb426..48a702d41c8c 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -524,6 +524,9 @@ int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans, { u64 extent_end = 0; u64 search_start = start; + u64 leaf_start; + u64 root_gen; + u64 root_owner; struct extent_buffer *leaf; struct btrfs_file_extent_item *extent; struct btrfs_path *path; @@ -562,6 +565,9 @@ next_slot: bookend = 0; found_extent = 0; found_inline = 0; + leaf_start = 0; + root_gen = 0; + root_owner = 0; extent = NULL; leaf = path->nodes[0]; slot = path->slots[0]; @@ -628,27 +634,18 @@ next_slot: search_start = extent_end; if (end <= extent_end && start >= key.offset && found_inline) { *hint_byte = EXTENT_MAP_INLINE; - continue; + goto out; + } + + if (found_extent) { + read_extent_buffer(leaf, &old, (unsigned long)extent, + sizeof(old)); + root_gen = btrfs_header_generation(leaf); + root_owner = btrfs_header_owner(leaf); + leaf_start = leaf->start; } + if (end < extent_end && end >= key.offset) { - if (found_extent) { - u64 disk_bytenr = - btrfs_file_extent_disk_bytenr(leaf, extent); - u64 disk_num_bytes = - btrfs_file_extent_disk_num_bytes(leaf, - extent); - read_extent_buffer(leaf, &old, - (unsigned long)extent, - sizeof(old)); - if (disk_bytenr != 0) { - ret = btrfs_inc_extent_ref(trans, root, - disk_bytenr, disk_num_bytes, - root->root_key.objectid, - trans->transid, - key.objectid, end); - BUG_ON(ret); - } - } bookend = 1; if (found_inline && start <= key.offset) keep = 1; @@ -687,49 +684,12 @@ next_slot: } /* delete the entire extent */ if (!keep) { - u64 disk_bytenr = 0; - u64 disk_num_bytes = 0; - u64 extent_num_bytes = 0; - u64 root_gen; - u64 root_owner; - - root_gen = btrfs_header_generation(leaf); - root_owner = btrfs_header_owner(leaf); - if (found_extent) { - disk_bytenr = - btrfs_file_extent_disk_bytenr(leaf, - extent); - disk_num_bytes = - btrfs_file_extent_disk_num_bytes(leaf, - extent); - extent_num_bytes = - btrfs_file_extent_num_bytes(leaf, extent); - *hint_byte = - btrfs_file_extent_disk_bytenr(leaf, - extent); - } ret = btrfs_del_item(trans, root, path); /* TODO update progress marker and return */ BUG_ON(ret); - btrfs_release_path(root, path); extent = NULL; - if (found_extent && disk_bytenr != 0) { - dec_i_blocks(inode, extent_num_bytes); - ret = btrfs_free_extent(trans, root, - disk_bytenr, - disk_num_bytes, - root_owner, - root_gen, inode->i_ino, - key.offset, 0); - } - - BUG_ON(ret); - if (!bookend && search_start >= end) { - ret = 0; - goto out; - } - if (!bookend) - continue; + btrfs_release_path(root, path); + /* the extent will be freed later */ } if (bookend && found_inline && start <= key.offset) { u32 new_size; @@ -737,10 +697,13 @@ next_slot: extent_end - end); dec_i_blocks(inode, (extent_end - key.offset) - (extent_end - end)); - btrfs_truncate_item(trans, root, path, new_size, 0); + ret = btrfs_truncate_item(trans, root, path, + new_size, 0); + BUG_ON(ret); } /* create bookend, splitting the extent in two */ if (bookend && found_extent) { + u64 disk_bytenr; struct btrfs_key ins; ins.objectid = inode->i_ino; ins.offset = end; @@ -748,13 +711,9 @@ next_slot: btrfs_release_path(root, path); ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*extent)); + BUG_ON(ret); leaf = path->nodes[0]; - if (ret) { - btrfs_print_leaf(root, leaf); - printk("got %d on inserting %Lu %u %Lu start %Lu end %Lu found %Lu %Lu keep was %d\n", ret , ins.objectid, ins.type, ins.offset, start, end, key.offset, extent_end, keep); - } - BUG_ON(ret); extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_file_extent_item); write_extent_buffer(leaf, &old, @@ -770,11 +729,43 @@ next_slot: BTRFS_FILE_EXTENT_REG); btrfs_mark_buffer_dirty(path->nodes[0]); - if (le64_to_cpu(old.disk_bytenr) != 0) { + + disk_bytenr = le64_to_cpu(old.disk_bytenr); + if (disk_bytenr != 0) { + ret = btrfs_inc_extent_ref(trans, root, + disk_bytenr, + le64_to_cpu(old.disk_num_bytes), + leaf->start, + root->root_key.objectid, + trans->transid, + ins.objectid, ins.offset); + BUG_ON(ret); + } + btrfs_release_path(root, path); + if (disk_bytenr != 0) { inode->i_blocks += btrfs_file_extent_num_bytes(leaf, extent) >> 9; } + } + + if (found_extent && !keep) { + u64 disk_bytenr = le64_to_cpu(old.disk_bytenr); + + if (disk_bytenr != 0) { + dec_i_blocks(inode, le64_to_cpu(old.num_bytes)); + ret = btrfs_free_extent(trans, root, + disk_bytenr, + le64_to_cpu(old.disk_num_bytes), + leaf_start, root_owner, + root_gen, key.objectid, + key.offset, 0); + BUG_ON(ret); + *hint_byte = disk_bytenr; + } + } + + if (search_start >= end) { ret = 0; goto out; } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 65b4f864b0df..2e7d82ec5d18 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -528,6 +528,9 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) struct btrfs_trans_handle *trans; struct btrfs_ordered_extent *ordered_extent; struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; + struct btrfs_file_extent_item *extent_item; + struct btrfs_path *path = NULL; + struct extent_buffer *leaf; u64 alloc_hint = 0; struct list_head list; struct btrfs_key ins; @@ -544,20 +547,15 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) goto nocow; + path = btrfs_alloc_path(); + BUG_ON(!path); + lock_extent(io_tree, ordered_extent->file_offset, ordered_extent->file_offset + ordered_extent->len - 1, GFP_NOFS); INIT_LIST_HEAD(&list); - ins.objectid = ordered_extent->start; - ins.offset = ordered_extent->len; - ins.type = BTRFS_EXTENT_ITEM_KEY; - - ret = btrfs_alloc_reserved_extent(trans, root, root->root_key.objectid, - trans->transid, inode->i_ino, - ordered_extent->file_offset, &ins); - BUG_ON(ret); mutex_lock(&BTRFS_I(inode)->extent_mutex); ret = btrfs_drop_extents(trans, root, inode, @@ -566,18 +564,42 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) ordered_extent->len, ordered_extent->file_offset, &alloc_hint); BUG_ON(ret); - ret = btrfs_insert_file_extent(trans, root, inode->i_ino, - ordered_extent->file_offset, - ordered_extent->start, - ordered_extent->len, - ordered_extent->len, 0); + + ins.objectid = inode->i_ino; + ins.offset = ordered_extent->file_offset; + ins.type = BTRFS_EXTENT_DATA_KEY; + ret = btrfs_insert_empty_item(trans, root, path, &ins, + sizeof(*extent_item)); BUG_ON(ret); + leaf = path->nodes[0]; + extent_item = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + btrfs_set_file_extent_generation(leaf, extent_item, trans->transid); + btrfs_set_file_extent_type(leaf, extent_item, BTRFS_FILE_EXTENT_REG); + btrfs_set_file_extent_disk_bytenr(leaf, extent_item, + ordered_extent->start); + btrfs_set_file_extent_disk_num_bytes(leaf, extent_item, + ordered_extent->len); + btrfs_set_file_extent_offset(leaf, extent_item, 0); + btrfs_set_file_extent_num_bytes(leaf, extent_item, + ordered_extent->len); + btrfs_mark_buffer_dirty(leaf); btrfs_drop_extent_cache(inode, ordered_extent->file_offset, ordered_extent->file_offset + ordered_extent->len - 1); mutex_unlock(&BTRFS_I(inode)->extent_mutex); + ins.objectid = ordered_extent->start; + ins.offset = ordered_extent->len; + ins.type = BTRFS_EXTENT_ITEM_KEY; + ret = btrfs_alloc_reserved_extent(trans, root, leaf->start, + root->root_key.objectid, + trans->transid, inode->i_ino, + ordered_extent->file_offset, &ins); + BUG_ON(ret); + btrfs_release_path(root, path); + inode->i_blocks += ordered_extent->len >> 9; unlock_extent(io_tree, ordered_extent->file_offset, ordered_extent->file_offset + ordered_extent->len - 1, @@ -596,6 +618,8 @@ nocow: btrfs_put_ordered_extent(ordered_extent); btrfs_end_transaction(trans, root); + if (path) + btrfs_free_path(path); return 0; } @@ -1433,10 +1457,7 @@ search_again: if (root->ref_cows) dec_i_blocks(inode, num_dec); } - if (root->ref_cows) { - root_gen = - btrfs_header_generation(leaf); - } + root_gen = btrfs_header_generation(leaf); root_owner = btrfs_header_owner(leaf); } } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { @@ -1477,7 +1498,7 @@ delete: if (found_extent) { ret = btrfs_free_extent(trans, root, extent_start, extent_num_bytes, - root_owner, + leaf->start, root_owner, root_gen, inode->i_ino, found_key.offset, 0); BUG_ON(ret); diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index f84b5f6991cc..4c6e0c15754d 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -76,9 +76,8 @@ static noinline int create_subvol(struct btrfs_root *root, char *name, if (ret) goto fail; - leaf = btrfs_alloc_free_block(trans, root, root->leafsize, - objectid, trans->transid, 0, 0, - 0, 0); + leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, + objectid, trans->transid, 0, 0, 0); if (IS_ERR(leaf)) { ret = PTR_ERR(leaf); goto fail; @@ -525,13 +524,10 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) struct file *src_file; struct inode *src; struct btrfs_trans_handle *trans; - struct btrfs_ordered_extent *ordered; struct btrfs_path *path; struct extent_buffer *leaf; char *buf; struct btrfs_key key; - struct btrfs_key new_key; - u32 size; u32 nritems; int slot; int ret; @@ -576,6 +572,7 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) /* do any pending delalloc/csum calc on src, one way or another, and lock file content */ while (1) { + struct btrfs_ordered_extent *ordered; lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered) @@ -619,6 +616,32 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) key.objectid != src->i_ino) break; + if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY || + btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { + u32 size; + struct btrfs_key new_key; + + size = btrfs_item_size_nr(leaf, slot); + read_extent_buffer(leaf, buf, + btrfs_item_ptr_offset(leaf, slot), + size); + btrfs_release_path(root, path); + + memcpy(&new_key, &key, sizeof(new_key)); + new_key.objectid = inode->i_ino; + ret = btrfs_insert_empty_item(trans, root, path, + &new_key, size); + if (ret) + goto out; + + leaf = path->nodes[0]; + slot = path->slots[0]; + write_extent_buffer(leaf, buf, + btrfs_item_ptr_offset(leaf, slot), + size); + btrfs_mark_buffer_dirty(leaf); + } + if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { struct btrfs_file_extent_item *extent; int found_type; @@ -634,31 +657,15 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) /* ds == 0 means there's a hole */ if (ds != 0) { ret = btrfs_inc_extent_ref(trans, root, - ds, dl, + ds, dl, leaf->start, root->root_key.objectid, trans->transid, inode->i_ino, key.offset); - if (ret) - goto out; + BUG_ON(ret); } } } - - if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY || - btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { - size = btrfs_item_size_nr(leaf, slot); - read_extent_buffer(leaf, buf, - btrfs_item_ptr_offset(leaf, slot), - size); - btrfs_release_path(root, path); - memcpy(&new_key, &key, sizeof(new_key)); - new_key.objectid = inode->i_ino; - ret = btrfs_insert_item(trans, root, &new_key, - buf, size); - BUG_ON(ret); - } else { - btrfs_release_path(root, path); - } + btrfs_release_path(root, path); key.offset++; } ret = 0; diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index f1374d597a17..3577badfa5bc 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c @@ -102,11 +102,12 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l) case BTRFS_EXTENT_REF_KEY: ref = btrfs_item_ptr(l, i, struct btrfs_extent_ref); printk("\t\textent back ref root %llu gen %llu " - "owner %llu offset %llu\n", + "owner %llu offset %llu num_refs %lu\n", (unsigned long long)btrfs_ref_root(l, ref), (unsigned long long)btrfs_ref_generation(l, ref), (unsigned long long)btrfs_ref_objectid(l, ref), - (unsigned long long)btrfs_ref_offset(l, ref)); + (unsigned long long)btrfs_ref_offset(l, ref), + (unsigned long)btrfs_ref_num_refs(l, ref)); break; case BTRFS_EXTENT_DATA_KEY: diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 56de3fb2d8d5..88bbfd959f18 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -89,9 +89,9 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans, int ret; u64 objectid = root->root_key.objectid; - leaf = btrfs_alloc_free_block(trans, root, root->leafsize, + leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, BTRFS_TREE_LOG_OBJECTID, - 0, 0, 0, 0, 0); + trans->transid, 0, 0, 0); if (IS_ERR(leaf)) { ret = PTR_ERR(leaf); return ret; @@ -433,6 +433,49 @@ insert: trans->transid); } } + + if (overwrite_root && + key->type == BTRFS_EXTENT_DATA_KEY) { + int extent_type; + struct btrfs_file_extent_item *fi; + + fi = (struct btrfs_file_extent_item *)dst_ptr; + extent_type = btrfs_file_extent_type(path->nodes[0], fi); + if (extent_type == BTRFS_FILE_EXTENT_REG) { + struct btrfs_key ins; + ins.objectid = btrfs_file_extent_disk_bytenr( + path->nodes[0], fi); + ins.offset = btrfs_file_extent_disk_num_bytes( + path->nodes[0], fi); + ins.type = BTRFS_EXTENT_ITEM_KEY; + + /* + * is this extent already allocated in the extent + * allocation tree? If so, just add a reference + */ + ret = btrfs_lookup_extent(root, ins.objectid, + ins.offset); + if (ret == 0) { + ret = btrfs_inc_extent_ref(trans, root, + ins.objectid, ins.offset, + path->nodes[0]->start, + root->root_key.objectid, + trans->transid, + key->objectid, key->offset); + } else { + /* + * insert the extent pointer in the extent + * allocation tree + */ + ret = btrfs_alloc_logged_extent(trans, root, + path->nodes[0]->start, + root->root_key.objectid, + trans->transid, key->objectid, + key->offset, &ins); + BUG_ON(ret); + } + } + } no_copy: btrfs_mark_buffer_dirty(path->nodes[0]); btrfs_release_path(root, path); @@ -551,45 +594,10 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans, start, extent_end, start, &alloc_hint); BUG_ON(ret); + /* insert the extent */ + ret = overwrite_item(trans, root, path, eb, slot, key); BUG_ON(ret); - if (found_type == BTRFS_FILE_EXTENT_REG) { - struct btrfs_key ins; - - ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); - ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); - ins.type = BTRFS_EXTENT_ITEM_KEY; - - /* insert the extent pointer in the file */ - ret = overwrite_item(trans, root, path, eb, slot, key); - BUG_ON(ret); - /* - * is this extent already allocated in the extent - * allocation tree? If so, just add a reference - */ - ret = btrfs_lookup_extent(root, path, ins.objectid, ins.offset); - btrfs_release_path(root, path); - if (ret == 0) { - ret = btrfs_inc_extent_ref(trans, root, - ins.objectid, ins.offset, - root->root_key.objectid, - trans->transid, key->objectid, start); - } else { - /* - * insert the extent pointer in the extent - * allocation tree - */ - ret = btrfs_alloc_logged_extent(trans, root, - root->root_key.objectid, - trans->transid, key->objectid, - start, &ins); - BUG_ON(ret); - } - } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { - /* inline extents are easy, we just overwrite them */ - ret = overwrite_item(trans, root, path, eb, slot, key); - BUG_ON(ret); - } /* btrfs_drop_extents changes i_blocks, update it here */ inode->i_blocks += (extent_end - start) >> 9; btrfs_update_inode(trans, root, inode); @@ -1806,16 +1814,14 @@ static int noinline walk_up_log_tree(struct btrfs_trans_handle *trans, WARN_ON(*level == 0); return 0; } else { - if (path->nodes[*level] == root->node) { - root_owner = root->root_key.objectid; - root_gen = - btrfs_header_generation(path->nodes[*level]); - } else { - struct extent_buffer *node; - node = path->nodes[*level + 1]; - root_owner = btrfs_header_owner(node); - root_gen = btrfs_header_generation(node); - } + struct extent_buffer *parent; + if (path->nodes[*level] == root->node) + parent = path->nodes[*level]; + else + parent = path->nodes[*level + 1]; + + root_owner = btrfs_header_owner(parent); + root_gen = btrfs_header_generation(parent); wc->process_func(root, path->nodes[*level], wc, btrfs_header_generation(path->nodes[*level])); if (wc->free) { @@ -2525,8 +2531,10 @@ static noinline int copy_items(struct btrfs_trans_handle *trans, if (ds != 0) { ret = btrfs_inc_extent_ref(trans, log, ds, dl, + dst_path->nodes[0]->start, BTRFS_TREE_LOG_OBJECTID, - 0, ins_keys[i].objectid, + trans->transid, + ins_keys[i].objectid, ins_keys[i].offset); BUG_ON(ret); } |