Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1 | #include <linux/module.h> |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2 | #include "ctree.h" |
| 3 | #include "disk-io.h" |
| 4 | #include "print-tree.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 5 | #include "transaction.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 6 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 7 | static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
| 8 | *orig_root, u64 num_blocks, u64 search_start, u64 |
| 9 | search_end, struct btrfs_key *ins); |
| 10 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
| 11 | btrfs_root *extent_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 12 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
| 13 | btrfs_root *extent_root); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 14 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 15 | static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 16 | *root, u64 blocknr, u64 num_blocks) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 17 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 18 | struct btrfs_path *path; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 19 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 20 | struct btrfs_key key; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 21 | struct btrfs_leaf *l; |
| 22 | struct btrfs_extent_item *item; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 23 | struct btrfs_key ins; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 24 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 25 | |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 26 | find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1, |
| 27 | &ins); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 28 | path = btrfs_alloc_path(); |
| 29 | BUG_ON(!path); |
| 30 | btrfs_init_path(path); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 31 | key.objectid = blocknr; |
| 32 | key.flags = 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 33 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 34 | key.offset = num_blocks; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 35 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 36 | 0, 1); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 37 | if (ret != 0) |
| 38 | BUG(); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 39 | BUG_ON(ret != 0); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 40 | l = btrfs_buffer_leaf(path->nodes[0]); |
| 41 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 42 | refs = btrfs_extent_refs(item); |
| 43 | btrfs_set_extent_refs(item, refs + 1); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 44 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 45 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 46 | btrfs_release_path(root->fs_info->extent_root, path); |
| 47 | btrfs_free_path(path); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 48 | finish_current_insert(trans, root->fs_info->extent_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 49 | del_pending_extents(trans, root->fs_info->extent_root); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 50 | return 0; |
| 51 | } |
| 52 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 53 | static int lookup_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 54 | *root, u64 blocknr, u64 num_blocks, u32 *refs) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 55 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 56 | struct btrfs_path *path; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 57 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 58 | struct btrfs_key key; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 59 | struct btrfs_leaf *l; |
| 60 | struct btrfs_extent_item *item; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 61 | |
| 62 | path = btrfs_alloc_path(); |
| 63 | btrfs_init_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 64 | key.objectid = blocknr; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 65 | key.offset = num_blocks; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 66 | key.flags = 0; |
| 67 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 68 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 69 | 0, 0); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 70 | if (ret != 0) |
| 71 | BUG(); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 72 | l = btrfs_buffer_leaf(path->nodes[0]); |
| 73 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 74 | *refs = btrfs_extent_refs(item); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 75 | btrfs_release_path(root->fs_info->extent_root, path); |
| 76 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 77 | return 0; |
| 78 | } |
| 79 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 80 | int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 81 | struct buffer_head *buf) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 82 | { |
| 83 | u64 blocknr; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 84 | struct btrfs_node *buf_node; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 85 | struct btrfs_leaf *buf_leaf; |
| 86 | struct btrfs_disk_key *key; |
| 87 | struct btrfs_file_extent_item *fi; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 88 | int i; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 89 | int leaf; |
| 90 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 91 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 92 | if (!root->ref_cows) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 93 | return 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 94 | buf_node = btrfs_buffer_node(buf); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 95 | leaf = btrfs_is_leaf(buf_node); |
| 96 | buf_leaf = btrfs_buffer_leaf(buf); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 97 | for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) { |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 98 | if (leaf) { |
| 99 | key = &buf_leaf->items[i].key; |
| 100 | if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY) |
| 101 | continue; |
| 102 | fi = btrfs_item_ptr(buf_leaf, i, |
| 103 | struct btrfs_file_extent_item); |
| 104 | ret = inc_block_ref(trans, root, |
| 105 | btrfs_file_extent_disk_blocknr(fi), |
| 106 | btrfs_file_extent_disk_num_blocks(fi)); |
| 107 | BUG_ON(ret); |
| 108 | } else { |
| 109 | blocknr = btrfs_node_blockptr(buf_node, i); |
| 110 | ret = inc_block_ref(trans, root, blocknr, 1); |
| 111 | BUG_ON(ret); |
| 112 | } |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 113 | } |
| 114 | return 0; |
| 115 | } |
| 116 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 117 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct |
| 118 | btrfs_root *root) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 119 | { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 120 | unsigned long gang[8]; |
Chris Mason | 88fd146 | 2007-03-16 08:56:18 -0400 | [diff] [blame] | 121 | u64 first = 0; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 122 | int ret; |
| 123 | int i; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 124 | struct radix_tree_root *pinned_radix = &root->fs_info->pinned_radix; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 125 | |
| 126 | while(1) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 127 | ret = find_first_radix_bit(pinned_radix, gang, |
| 128 | ARRAY_SIZE(gang)); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 129 | if (!ret) |
| 130 | break; |
Chris Mason | 88fd146 | 2007-03-16 08:56:18 -0400 | [diff] [blame] | 131 | if (!first) |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 132 | first = gang[0]; |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 133 | for (i = 0; i < ret; i++) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 134 | clear_radix_bit(pinned_radix, gang[i]); |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 135 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 136 | } |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 137 | if (root->fs_info->last_insert.objectid > first) |
| 138 | root->fs_info->last_insert.objectid = first; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 139 | root->fs_info->last_insert.offset = 0; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 140 | return 0; |
| 141 | } |
| 142 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 143 | static int finish_current_insert(struct btrfs_trans_handle *trans, struct |
| 144 | btrfs_root *extent_root) |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 145 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 146 | struct btrfs_key ins; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 147 | struct btrfs_extent_item extent_item; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 148 | int i; |
| 149 | int ret; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 150 | u64 super_blocks_used; |
| 151 | struct btrfs_fs_info *info = extent_root->fs_info; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 152 | |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 153 | btrfs_set_extent_refs(&extent_item, 1); |
| 154 | btrfs_set_extent_owner(&extent_item, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 155 | btrfs_header_parentid(btrfs_buffer_header(extent_root->node))); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 156 | ins.offset = 1; |
| 157 | ins.flags = 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 158 | btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 159 | |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 160 | for (i = 0; i < extent_root->fs_info->current_insert.flags; i++) { |
| 161 | ins.objectid = extent_root->fs_info->current_insert.objectid + |
| 162 | i; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 163 | super_blocks_used = btrfs_super_blocks_used(info->disk_super); |
| 164 | btrfs_set_super_blocks_used(info->disk_super, |
| 165 | super_blocks_used + 1); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 166 | ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item, |
| 167 | sizeof(extent_item)); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 168 | BUG_ON(ret); |
| 169 | } |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 170 | extent_root->fs_info->current_insert.offset = 0; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 171 | return 0; |
| 172 | } |
| 173 | |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 174 | static int pin_down_block(struct btrfs_root *root, u64 blocknr, int pending) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 175 | { |
| 176 | int err; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 177 | struct btrfs_header *header; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 178 | struct buffer_head *bh; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 179 | |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 180 | if (!pending) { |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 181 | bh = btrfs_find_tree_block(root, blocknr); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 182 | if (bh) { |
| 183 | if (buffer_uptodate(bh)) { |
| 184 | u64 transid = |
| 185 | root->fs_info->running_transaction->transid; |
| 186 | header = btrfs_buffer_header(bh); |
| 187 | if (btrfs_header_generation(header) == |
| 188 | transid) { |
| 189 | btrfs_block_release(root, bh); |
| 190 | return 0; |
| 191 | } |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 192 | } |
Chris Mason | d602557 | 2007-03-30 14:27:56 -0400 | [diff] [blame] | 193 | btrfs_block_release(root, bh); |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 194 | } |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 195 | err = set_radix_bit(&root->fs_info->pinned_radix, blocknr); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 196 | } else { |
| 197 | err = set_radix_bit(&root->fs_info->pending_del_radix, blocknr); |
| 198 | } |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 199 | BUG_ON(err); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 200 | return 0; |
| 201 | } |
| 202 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 203 | /* |
| 204 | * remove an extent from the root, returns 0 on success |
| 205 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 206 | static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 207 | *root, u64 blocknr, u64 num_blocks, int pin) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 208 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 209 | struct btrfs_path *path; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 210 | struct btrfs_key key; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 211 | struct btrfs_fs_info *info = root->fs_info; |
| 212 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 213 | int ret; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 214 | struct btrfs_extent_item *ei; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 215 | struct btrfs_key ins; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 216 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 217 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 218 | key.objectid = blocknr; |
| 219 | key.flags = 0; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 220 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 221 | key.offset = num_blocks; |
| 222 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 223 | find_free_extent(trans, root, 0, 0, (u64)-1, &ins); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 224 | path = btrfs_alloc_path(); |
| 225 | BUG_ON(!path); |
| 226 | btrfs_init_path(path); |
Chris Mason | 5f26f77 | 2007-04-05 10:38:44 -0400 | [diff] [blame^] | 227 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 228 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 229 | if (ret) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 230 | printk("failed to find %Lu\n", key.objectid); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 231 | btrfs_print_tree(extent_root, extent_root->node); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 232 | printk("failed to find %Lu\n", key.objectid); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 233 | BUG(); |
| 234 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 235 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 236 | struct btrfs_extent_item); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 237 | BUG_ON(ei->refs == 0); |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 238 | refs = btrfs_extent_refs(ei) - 1; |
| 239 | btrfs_set_extent_refs(ei, refs); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 240 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 241 | if (refs == 0) { |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 242 | u64 super_blocks_used; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 243 | |
| 244 | if (pin) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 245 | ret = pin_down_block(root, blocknr, 0); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 246 | BUG_ON(ret); |
| 247 | } |
| 248 | |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 249 | super_blocks_used = btrfs_super_blocks_used(info->disk_super); |
| 250 | btrfs_set_super_blocks_used(info->disk_super, |
| 251 | super_blocks_used - num_blocks); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 252 | ret = btrfs_del_item(trans, extent_root, path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 253 | if (ret) |
| 254 | BUG(); |
| 255 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 256 | btrfs_release_path(extent_root, path); |
| 257 | btrfs_free_path(path); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 258 | finish_current_insert(trans, extent_root); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 259 | return ret; |
| 260 | } |
| 261 | |
| 262 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 263 | * find all the blocks marked as pending in the radix tree and remove |
| 264 | * them from the extent map |
| 265 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 266 | static int del_pending_extents(struct btrfs_trans_handle *trans, struct |
| 267 | btrfs_root *extent_root) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 268 | { |
| 269 | int ret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 270 | int wret; |
| 271 | int err = 0; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 272 | unsigned long gang[4]; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 273 | int i; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 274 | struct radix_tree_root *pending_radix; |
| 275 | struct radix_tree_root *pinned_radix; |
| 276 | |
| 277 | pending_radix = &extent_root->fs_info->pending_del_radix; |
| 278 | pinned_radix = &extent_root->fs_info->pinned_radix; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 279 | |
| 280 | while(1) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 281 | ret = find_first_radix_bit(pending_radix, gang, |
| 282 | ARRAY_SIZE(gang)); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 283 | if (!ret) |
| 284 | break; |
| 285 | for (i = 0; i < ret; i++) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 286 | wret = set_radix_bit(pinned_radix, gang[i]); |
| 287 | BUG_ON(wret); |
| 288 | wret = clear_radix_bit(pending_radix, gang[i]); |
| 289 | BUG_ON(wret); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 290 | wret = __free_extent(trans, extent_root, |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 291 | gang[i], 1, 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 292 | if (wret) |
| 293 | err = wret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 294 | } |
| 295 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 296 | return err; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | /* |
| 300 | * remove an extent from the root, returns 0 on success |
| 301 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 302 | int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
| 303 | *root, u64 blocknr, u64 num_blocks, int pin) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 304 | { |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 305 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 306 | int pending_ret; |
| 307 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 308 | |
| 309 | if (root == extent_root) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 310 | pin_down_block(root, blocknr, 1); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 311 | return 0; |
| 312 | } |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 313 | ret = __free_extent(trans, root, blocknr, num_blocks, pin); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 314 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 315 | return ret ? ret : pending_ret; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * walks the btree of allocated extents and find a hole of a given size. |
| 320 | * The key ins is changed to record the hole: |
| 321 | * ins->objectid == block start |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 322 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 323 | * ins->offset == number of blocks |
| 324 | * Any available blocks before search_start are skipped. |
| 325 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 326 | static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
| 327 | *orig_root, u64 num_blocks, u64 search_start, u64 |
| 328 | search_end, struct btrfs_key *ins) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 329 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 330 | struct btrfs_path *path; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 331 | struct btrfs_key key; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 332 | int ret; |
| 333 | u64 hole_size = 0; |
| 334 | int slot = 0; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 335 | u64 last_block = 0; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 336 | u64 test_block; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 337 | int start_found; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 338 | struct btrfs_leaf *l; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 339 | struct btrfs_root * root = orig_root->fs_info->extent_root; |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 340 | int total_needed = num_blocks; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 341 | int level; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 342 | |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 343 | path = btrfs_alloc_path(); |
| 344 | ins->flags = 0; |
| 345 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
| 346 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 347 | level = btrfs_header_level(btrfs_buffer_header(root->node)); |
| 348 | total_needed += (level + 1) * 3; |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 349 | if (root->fs_info->last_insert.objectid == 0 && search_end == (u64)-1) { |
| 350 | struct btrfs_disk_key *last_key; |
| 351 | btrfs_init_path(path); |
| 352 | ins->objectid = (u64)-1; |
| 353 | ins->offset = (u64)-1; |
| 354 | ret = btrfs_search_slot(trans, root, ins, path, 0, 0); |
| 355 | if (ret < 0) |
| 356 | goto error; |
| 357 | BUG_ON(ret == 0); |
| 358 | if (path->slots[0] > 0) |
| 359 | path->slots[0]--; |
| 360 | l = btrfs_buffer_leaf(path->nodes[0]); |
| 361 | last_key = &l->items[path->slots[0]].key; |
| 362 | search_start = btrfs_disk_key_objectid(last_key); |
| 363 | } |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 364 | if (root->fs_info->last_insert.objectid > search_start) |
| 365 | search_start = root->fs_info->last_insert.objectid; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 366 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 367 | check_failed: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 368 | btrfs_init_path(path); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 369 | ins->objectid = search_start; |
| 370 | ins->offset = 0; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 371 | start_found = 0; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 372 | ret = btrfs_search_slot(trans, root, ins, path, 0, 0); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 373 | if (ret < 0) |
| 374 | goto error; |
Chris Mason | aa5d6be | 2007-02-28 16:35:06 -0500 | [diff] [blame] | 375 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 376 | if (path->slots[0] > 0) |
| 377 | path->slots[0]--; |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 378 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 379 | while (1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 380 | l = btrfs_buffer_leaf(path->nodes[0]); |
| 381 | slot = path->slots[0]; |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 382 | if (slot >= btrfs_header_nritems(&l->header)) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 383 | ret = btrfs_next_leaf(root, path); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 384 | if (ret == 0) |
| 385 | continue; |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 386 | if (ret < 0) |
| 387 | goto error; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 388 | if (!start_found) { |
| 389 | ins->objectid = search_start; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 390 | ins->offset = (u64)-1; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 391 | start_found = 1; |
| 392 | goto check_pending; |
| 393 | } |
| 394 | ins->objectid = last_block > search_start ? |
| 395 | last_block : search_start; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 396 | ins->offset = (u64)-1; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 397 | goto check_pending; |
| 398 | } |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 399 | btrfs_disk_key_to_cpu(&key, &l->items[slot].key); |
| 400 | if (key.objectid >= search_start) { |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 401 | if (start_found) { |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 402 | if (last_block < search_start) |
| 403 | last_block = search_start; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 404 | hole_size = key.objectid - last_block; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 405 | if (hole_size > total_needed) { |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 406 | ins->objectid = last_block; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 407 | ins->offset = hole_size; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 408 | goto check_pending; |
| 409 | } |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 410 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 411 | } |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 412 | start_found = 1; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 413 | last_block = key.objectid + key.offset; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 414 | path->slots[0]++; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 415 | } |
| 416 | // FIXME -ENOSPC |
| 417 | check_pending: |
| 418 | /* we have to make sure we didn't find an extent that has already |
| 419 | * been allocated by the map tree or the original allocation |
| 420 | */ |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 421 | btrfs_release_path(root, path); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 422 | BUG_ON(ins->objectid < search_start); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 423 | for (test_block = ins->objectid; |
| 424 | test_block < ins->objectid + total_needed; test_block++) { |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 425 | if (test_radix_bit(&root->fs_info->pinned_radix, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 426 | test_block)) { |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 427 | search_start = test_block + 1; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 428 | goto check_failed; |
| 429 | } |
| 430 | } |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 431 | BUG_ON(root->fs_info->current_insert.offset); |
| 432 | root->fs_info->current_insert.offset = total_needed - num_blocks; |
| 433 | root->fs_info->current_insert.objectid = ins->objectid + num_blocks; |
| 434 | root->fs_info->current_insert.flags = 0; |
| 435 | root->fs_info->last_insert.objectid = ins->objectid; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 436 | ins->offset = num_blocks; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 437 | btrfs_free_path(path); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 438 | return 0; |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 439 | error: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 440 | btrfs_release_path(root, path); |
| 441 | btrfs_free_path(path); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 442 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 446 | * finds a free extent and does all the dirty work required for allocation |
| 447 | * returns the key for the extent through ins, and a tree buffer for |
| 448 | * the first block of the extent through buf. |
| 449 | * |
| 450 | * returns 0 if everything worked, non-zero otherwise. |
| 451 | */ |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 452 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 453 | *root, u64 num_blocks, u64 search_start, u64 |
| 454 | search_end, u64 owner, struct btrfs_key *ins) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 455 | { |
| 456 | int ret; |
| 457 | int pending_ret; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 458 | u64 super_blocks_used; |
| 459 | struct btrfs_fs_info *info = root->fs_info; |
| 460 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 461 | struct btrfs_extent_item extent_item; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 462 | |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 463 | btrfs_set_extent_refs(&extent_item, 1); |
| 464 | btrfs_set_extent_owner(&extent_item, owner); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 465 | |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 466 | if (root == extent_root) { |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 467 | BUG_ON(extent_root->fs_info->current_insert.offset == 0); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 468 | BUG_ON(num_blocks != 1); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 469 | BUG_ON(extent_root->fs_info->current_insert.flags == |
| 470 | extent_root->fs_info->current_insert.offset); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 471 | ins->offset = 1; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 472 | ins->objectid = extent_root->fs_info->current_insert.objectid + |
| 473 | extent_root->fs_info->current_insert.flags++; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 474 | return 0; |
| 475 | } |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 476 | ret = find_free_extent(trans, root, num_blocks, search_start, |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 477 | search_end, ins); |
| 478 | if (ret) |
| 479 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 480 | |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 481 | super_blocks_used = btrfs_super_blocks_used(info->disk_super); |
| 482 | btrfs_set_super_blocks_used(info->disk_super, super_blocks_used + |
| 483 | num_blocks); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 484 | ret = btrfs_insert_item(trans, extent_root, ins, &extent_item, |
| 485 | sizeof(extent_item)); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 486 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 487 | finish_current_insert(trans, extent_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 488 | pending_ret = del_pending_extents(trans, extent_root); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 489 | if (ret) |
| 490 | return ret; |
| 491 | if (pending_ret) |
| 492 | return pending_ret; |
| 493 | return 0; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | /* |
| 497 | * helper function to allocate a block for a given tree |
| 498 | * returns the tree buffer or NULL. |
| 499 | */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 500 | struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 501 | struct btrfs_root *root) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 502 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 503 | struct btrfs_key ins; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 504 | int ret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 505 | struct buffer_head *buf; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 506 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 507 | ret = btrfs_alloc_extent(trans, root, 1, 0, (unsigned long)-1, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 508 | btrfs_header_parentid(btrfs_buffer_header(root->node)), &ins); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 509 | if (ret) { |
| 510 | BUG(); |
| 511 | return NULL; |
| 512 | } |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 513 | buf = btrfs_find_create_tree_block(root, ins.objectid); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 514 | set_buffer_uptodate(buf); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 515 | return buf; |
| 516 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 517 | |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 518 | static int drop_leaf_ref(struct btrfs_trans_handle *trans, |
| 519 | struct btrfs_root *root, struct buffer_head *cur) |
| 520 | { |
| 521 | struct btrfs_disk_key *key; |
| 522 | struct btrfs_leaf *leaf; |
| 523 | struct btrfs_file_extent_item *fi; |
| 524 | int i; |
| 525 | int nritems; |
| 526 | int ret; |
| 527 | |
| 528 | BUG_ON(!btrfs_is_leaf(btrfs_buffer_node(cur))); |
| 529 | leaf = btrfs_buffer_leaf(cur); |
| 530 | nritems = btrfs_header_nritems(&leaf->header); |
| 531 | for (i = 0; i < nritems; i++) { |
| 532 | key = &leaf->items[i].key; |
| 533 | if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY) |
| 534 | continue; |
| 535 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
| 536 | /* |
| 537 | * FIXME make sure to insert a trans record that |
| 538 | * repeats the snapshot del on crash |
| 539 | */ |
| 540 | ret = btrfs_free_extent(trans, root, |
| 541 | btrfs_file_extent_disk_blocknr(fi), |
| 542 | btrfs_file_extent_disk_num_blocks(fi), |
| 543 | 0); |
| 544 | BUG_ON(ret); |
| 545 | } |
| 546 | return 0; |
| 547 | } |
| 548 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 549 | /* |
| 550 | * helper function for drop_snapshot, this walks down the tree dropping ref |
| 551 | * counts as it goes. |
| 552 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 553 | static int walk_down_tree(struct btrfs_trans_handle *trans, struct btrfs_root |
| 554 | *root, struct btrfs_path *path, int *level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 555 | { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 556 | struct buffer_head *next; |
| 557 | struct buffer_head *cur; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 558 | u64 blocknr; |
| 559 | int ret; |
| 560 | u32 refs; |
| 561 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 562 | WARN_ON(*level < 0); |
| 563 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 564 | ret = lookup_block_ref(trans, root, path->nodes[*level]->b_blocknr, |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 565 | 1, &refs); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 566 | BUG_ON(ret); |
| 567 | if (refs > 1) |
| 568 | goto out; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 569 | /* |
| 570 | * walk down to the last node level and free all the leaves |
| 571 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 572 | while(*level >= 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 573 | WARN_ON(*level < 0); |
| 574 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 575 | cur = path->nodes[*level]; |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 576 | if (btrfs_header_level(btrfs_buffer_header(cur)) != *level) |
| 577 | WARN_ON(1); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 578 | if (path->slots[*level] >= |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 579 | btrfs_header_nritems(btrfs_buffer_header(cur))) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 580 | break; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 581 | if (*level == 0) { |
| 582 | ret = drop_leaf_ref(trans, root, cur); |
| 583 | BUG_ON(ret); |
| 584 | break; |
| 585 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 586 | blocknr = btrfs_node_blockptr(btrfs_buffer_node(cur), |
| 587 | path->slots[*level]); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 588 | ret = lookup_block_ref(trans, root, blocknr, 1, &refs); |
| 589 | BUG_ON(ret); |
| 590 | if (refs != 1) { |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 591 | path->slots[*level]++; |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 592 | ret = btrfs_free_extent(trans, root, blocknr, 1, 1); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 593 | BUG_ON(ret); |
| 594 | continue; |
| 595 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 596 | next = read_tree_block(root, blocknr); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 597 | WARN_ON(*level <= 0); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 598 | if (path->nodes[*level-1]) |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 599 | btrfs_block_release(root, path->nodes[*level-1]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 600 | path->nodes[*level-1] = next; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 601 | *level = btrfs_header_level(btrfs_buffer_header(next)); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 602 | path->slots[*level] = 0; |
| 603 | } |
| 604 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 605 | WARN_ON(*level < 0); |
| 606 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 607 | ret = btrfs_free_extent(trans, root, |
| 608 | path->nodes[*level]->b_blocknr, 1, 1); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 609 | btrfs_block_release(root, path->nodes[*level]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 610 | path->nodes[*level] = NULL; |
| 611 | *level += 1; |
| 612 | BUG_ON(ret); |
| 613 | return 0; |
| 614 | } |
| 615 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 616 | /* |
| 617 | * helper for dropping snapshots. This walks back up the tree in the path |
| 618 | * to find the first node higher up where we haven't yet gone through |
| 619 | * all the slots |
| 620 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 621 | static int walk_up_tree(struct btrfs_trans_handle *trans, struct btrfs_root |
| 622 | *root, struct btrfs_path *path, int *level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 623 | { |
| 624 | int i; |
| 625 | int slot; |
| 626 | int ret; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 627 | for(i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 628 | slot = path->slots[i]; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 629 | if (slot < btrfs_header_nritems( |
| 630 | btrfs_buffer_header(path->nodes[i])) - 1) { |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 631 | path->slots[i]++; |
| 632 | *level = i; |
| 633 | return 0; |
| 634 | } else { |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 635 | ret = btrfs_free_extent(trans, root, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 636 | path->nodes[*level]->b_blocknr, |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 637 | 1, 1); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 638 | BUG_ON(ret); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 639 | btrfs_block_release(root, path->nodes[*level]); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 640 | path->nodes[*level] = NULL; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 641 | *level = i + 1; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 642 | } |
| 643 | } |
| 644 | return 1; |
| 645 | } |
| 646 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 647 | /* |
| 648 | * drop the reference count on the tree rooted at 'snap'. This traverses |
| 649 | * the tree freeing any blocks that have a ref count of zero after being |
| 650 | * decremented. |
| 651 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 652 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 653 | *root, struct buffer_head *snap) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 654 | { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 655 | int ret = 0; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 656 | int wret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 657 | int level; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 658 | struct btrfs_path *path; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 659 | int i; |
| 660 | int orig_level; |
| 661 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 662 | path = btrfs_alloc_path(); |
| 663 | BUG_ON(!path); |
| 664 | btrfs_init_path(path); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 665 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 666 | level = btrfs_header_level(btrfs_buffer_header(snap)); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 667 | orig_level = level; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 668 | path->nodes[level] = snap; |
| 669 | path->slots[level] = 0; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 670 | while(1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 671 | wret = walk_down_tree(trans, root, path, &level); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 672 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 673 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 674 | if (wret < 0) |
| 675 | ret = wret; |
| 676 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 677 | wret = walk_up_tree(trans, root, path, &level); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 678 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 679 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 680 | if (wret < 0) |
| 681 | ret = wret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 682 | } |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 683 | for (i = 0; i <= orig_level; i++) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 684 | if (path->nodes[i]) { |
| 685 | btrfs_block_release(root, path->nodes[i]); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 686 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 687 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 688 | btrfs_free_path(path); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 689 | return ret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 690 | } |