Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 1 | #define _XOPEN_SOURCE 500 |
| 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <sys/types.h> |
| 5 | #include <sys/stat.h> |
| 6 | #include <fcntl.h> |
| 7 | #include <unistd.h> |
| 8 | #include "kerncompat.h" |
| 9 | #include "radix-tree.h" |
| 10 | #include "ctree.h" |
| 11 | #include "disk-io.h" |
| 12 | |
| 13 | static int allocated_blocks = 0; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 14 | int cache_max = 10000; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 15 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 16 | static int check_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 17 | { |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 18 | if (buf->blocknr != btrfs_header_blocknr(&buf->node.header)) |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 19 | BUG(); |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 20 | if (root->node && btrfs_header_parentid(&buf->node.header) != |
| 21 | btrfs_header_parentid(&root->node->node.header)) |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 22 | BUG(); |
| 23 | return 0; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 24 | } |
| 25 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 26 | static int free_some_buffers(struct btrfs_root *root) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 27 | { |
| 28 | struct list_head *node, *next; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 29 | struct btrfs_buffer *b; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 30 | if (root->cache_size < cache_max) |
| 31 | return 0; |
| 32 | list_for_each_safe(node, next, &root->cache) { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 33 | b = list_entry(node, struct btrfs_buffer, cache); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 34 | if (b->count == 1) { |
| 35 | BUG_ON(!list_empty(&b->dirty)); |
| 36 | list_del_init(&b->cache); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 37 | btrfs_block_release(root, b); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 38 | if (root->cache_size < cache_max) |
Chris Mason | 77ce684 | 2007-03-02 10:06:43 -0500 | [diff] [blame] | 39 | break; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 40 | } |
| 41 | } |
| 42 | return 0; |
| 43 | } |
| 44 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 45 | struct btrfs_buffer *alloc_tree_block(struct btrfs_root *root, u64 blocknr) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 46 | { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 47 | struct btrfs_buffer *buf; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 48 | int ret; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 49 | |
| 50 | buf = malloc(sizeof(struct btrfs_buffer) + root->blocksize); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 51 | if (!buf) |
| 52 | return buf; |
| 53 | allocated_blocks++; |
| 54 | buf->blocknr = blocknr; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 55 | buf->count = 2; |
| 56 | INIT_LIST_HEAD(&buf->dirty); |
| 57 | free_some_buffers(root); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 58 | radix_tree_preload(GFP_KERNEL); |
| 59 | ret = radix_tree_insert(&root->cache_radix, blocknr, buf); |
| 60 | radix_tree_preload_end(); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 61 | list_add_tail(&buf->cache, &root->cache); |
| 62 | root->cache_size++; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 63 | if (ret) { |
| 64 | free(buf); |
| 65 | return NULL; |
| 66 | } |
| 67 | return buf; |
| 68 | } |
| 69 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 70 | struct btrfs_buffer *find_tree_block(struct btrfs_root *root, u64 blocknr) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 71 | { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 72 | struct btrfs_buffer *buf; |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 73 | buf = radix_tree_lookup(&root->cache_radix, blocknr); |
| 74 | if (buf) { |
| 75 | buf->count++; |
| 76 | } else { |
| 77 | buf = alloc_tree_block(root, blocknr); |
| 78 | if (!buf) { |
| 79 | BUG(); |
| 80 | return NULL; |
| 81 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 82 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 83 | return buf; |
| 84 | } |
| 85 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 86 | struct btrfs_buffer *read_tree_block(struct btrfs_root *root, u64 blocknr) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 87 | { |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 88 | loff_t offset = blocknr * root->blocksize; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 89 | struct btrfs_buffer *buf; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 90 | int ret; |
| 91 | |
| 92 | buf = radix_tree_lookup(&root->cache_radix, blocknr); |
| 93 | if (buf) { |
| 94 | buf->count++; |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 95 | } else { |
| 96 | buf = alloc_tree_block(root, blocknr); |
| 97 | if (!buf) |
| 98 | return NULL; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 99 | ret = pread(root->fp, &buf->node, root->blocksize, offset); |
| 100 | if (ret != root->blocksize) { |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 101 | free(buf); |
| 102 | return NULL; |
| 103 | } |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 104 | } |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 105 | if (check_tree_block(root, buf)) |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 106 | BUG(); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 107 | return buf; |
| 108 | } |
| 109 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 110 | int dirty_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 111 | { |
| 112 | if (!list_empty(&buf->dirty)) |
| 113 | return 0; |
| 114 | list_add_tail(&buf->dirty, &root->trans); |
| 115 | buf->count++; |
| 116 | return 0; |
| 117 | } |
| 118 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 119 | int clean_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 120 | { |
| 121 | if (!list_empty(&buf->dirty)) { |
| 122 | list_del_init(&buf->dirty); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 123 | btrfs_block_release(root, buf); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 124 | } |
| 125 | return 0; |
| 126 | } |
| 127 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 128 | int write_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 129 | { |
| 130 | u64 blocknr = buf->blocknr; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 131 | loff_t offset = blocknr * root->blocksize; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 132 | int ret; |
| 133 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 134 | if (buf->blocknr != btrfs_header_blocknr(&buf->node.header)) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 135 | BUG(); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 136 | ret = pwrite(root->fp, &buf->node, root->blocksize, offset); |
| 137 | if (ret != root->blocksize) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 138 | return ret; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 139 | return 0; |
| 140 | } |
| 141 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 142 | static int __commit_transaction(struct btrfs_root *root) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 143 | { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 144 | struct btrfs_buffer *b; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 145 | int ret = 0; |
| 146 | int wret; |
| 147 | while(!list_empty(&root->trans)) { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 148 | b = list_entry(root->trans.next, struct btrfs_buffer, dirty); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 149 | list_del_init(&b->dirty); |
| 150 | wret = write_tree_block(root, b); |
| 151 | if (wret) |
| 152 | ret = wret; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 153 | btrfs_block_release(root, b); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 154 | } |
| 155 | return ret; |
| 156 | } |
| 157 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 158 | static int commit_extent_and_tree_roots(struct btrfs_root *tree_root, |
| 159 | struct btrfs_root *extent_root) |
| 160 | { |
| 161 | int ret; |
| 162 | u64 old_extent_block; |
| 163 | |
| 164 | while(1) { |
| 165 | old_extent_block = btrfs_root_blocknr(&extent_root->root_item); |
| 166 | if (old_extent_block == extent_root->node->blocknr) |
| 167 | break; |
| 168 | btrfs_set_root_blocknr(&extent_root->root_item, |
| 169 | extent_root->node->blocknr); |
| 170 | ret = btrfs_update_root(tree_root, |
| 171 | &extent_root->root_key, |
| 172 | &extent_root->root_item); |
| 173 | BUG_ON(ret); |
| 174 | } |
| 175 | __commit_transaction(extent_root); |
| 176 | __commit_transaction(tree_root); |
| 177 | return 0; |
| 178 | } |
| 179 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 180 | int btrfs_commit_transaction(struct btrfs_root *root, |
| 181 | struct btrfs_super_block *s) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 182 | { |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 183 | int ret = 0; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 184 | struct btrfs_buffer *snap = root->commit_root; |
| 185 | struct btrfs_key snap_key; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 186 | |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 187 | ret = __commit_transaction(root); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 188 | BUG_ON(ret); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 189 | |
| 190 | if (root->commit_root == root->node) |
| 191 | return 0; |
| 192 | |
| 193 | memcpy(&snap_key, &root->root_key, sizeof(snap_key)); |
| 194 | root->root_key.offset++; |
| 195 | |
| 196 | btrfs_set_root_blocknr(&root->root_item, root->node->blocknr); |
| 197 | ret = btrfs_insert_root(root->tree_root, &root->root_key, |
| 198 | &root->root_item); |
| 199 | BUG_ON(ret); |
| 200 | |
| 201 | ret = commit_extent_and_tree_roots(root->tree_root, root->extent_root); |
| 202 | BUG_ON(ret); |
| 203 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 204 | write_ctree_super(root, s); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 205 | btrfs_finish_extent_commit(root->extent_root); |
| 206 | btrfs_finish_extent_commit(root->tree_root); |
| 207 | |
| 208 | root->commit_root = root->node; |
| 209 | root->node->count++; |
| 210 | ret = btrfs_drop_snapshot(root, snap); |
| 211 | BUG_ON(ret); |
| 212 | |
| 213 | ret = btrfs_del_root(root->tree_root, &snap_key); |
| 214 | BUG_ON(ret); |
| 215 | |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 216 | return ret; |
| 217 | } |
| 218 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 219 | static int __setup_root(struct btrfs_super_block *super, |
| 220 | struct btrfs_root *root, u64 objectid, int fp) |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 221 | { |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 222 | INIT_LIST_HEAD(&root->trans); |
| 223 | INIT_LIST_HEAD(&root->cache); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 224 | root->cache_size = 0; |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 225 | root->fp = fp; |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 226 | root->node = NULL; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 227 | root->commit_root = NULL; |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 228 | root->blocksize = btrfs_super_blocksize(super); |
| 229 | root->ref_cows = 0; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 230 | memset(&root->current_insert, 0, sizeof(root->current_insert)); |
Chris Mason | 0579da4 | 2007-03-07 16:15:30 -0500 | [diff] [blame] | 231 | memset(&root->last_insert, 0, sizeof(root->last_insert)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 232 | memset(&root->root_key, 0, sizeof(root->root_key)); |
| 233 | memset(&root->root_item, 0, sizeof(root->root_item)); |
| 234 | return 0; |
| 235 | } |
| 236 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 237 | static int find_and_setup_root(struct btrfs_super_block *super, |
| 238 | struct btrfs_root *tree_root, u64 objectid, |
| 239 | struct btrfs_root *root, int fp) |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 240 | { |
| 241 | int ret; |
| 242 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 243 | __setup_root(super, root, objectid, fp); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 244 | ret = btrfs_find_last_root(tree_root, objectid, |
| 245 | &root->root_item, &root->root_key); |
| 246 | BUG_ON(ret); |
| 247 | |
| 248 | root->node = read_tree_block(root, |
| 249 | btrfs_root_blocknr(&root->root_item)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 250 | BUG_ON(!root->node); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 251 | return 0; |
| 252 | } |
| 253 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 254 | struct btrfs_root *open_ctree(char *filename, struct btrfs_super_block *super) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 255 | { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 256 | struct btrfs_root *root = malloc(sizeof(struct btrfs_root)); |
| 257 | struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 258 | struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root)); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 259 | int fp; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 260 | int ret; |
| 261 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 262 | root->extent_root = extent_root; |
| 263 | root->tree_root = tree_root; |
| 264 | |
| 265 | extent_root->extent_root = extent_root; |
| 266 | extent_root->tree_root = tree_root; |
| 267 | |
| 268 | tree_root->extent_root = extent_root; |
| 269 | tree_root->tree_root = tree_root; |
| 270 | |
Chris Mason | c673024 | 2007-02-26 10:46:55 -0500 | [diff] [blame] | 271 | fp = open(filename, O_CREAT | O_RDWR, 0600); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 272 | if (fp < 0) { |
| 273 | free(root); |
| 274 | return NULL; |
| 275 | } |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 276 | INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 277 | INIT_RADIX_TREE(&root->pinned_radix, GFP_KERNEL); |
| 278 | INIT_RADIX_TREE(&extent_root->pinned_radix, GFP_KERNEL); |
Chris Mason | 9a8dd15 | 2007-02-23 08:38:36 -0500 | [diff] [blame] | 279 | INIT_RADIX_TREE(&extent_root->cache_radix, GFP_KERNEL); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 280 | INIT_RADIX_TREE(&tree_root->pinned_radix, GFP_KERNEL); |
| 281 | INIT_RADIX_TREE(&tree_root->cache_radix, GFP_KERNEL); |
| 282 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 283 | ret = pread(fp, super, sizeof(struct btrfs_super_block), |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 284 | BTRFS_SUPER_INFO_OFFSET); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 285 | if (ret == 0 || btrfs_super_root(super) == 0) { |
Chris Mason | 5c680ed | 2007-02-22 11:39:13 -0500 | [diff] [blame] | 286 | printf("making new FS!\n"); |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 287 | ret = mkfs(fp, 0, 1024); |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 288 | if (ret) |
| 289 | return NULL; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 290 | ret = pread(fp, super, sizeof(struct btrfs_super_block), |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 291 | BTRFS_SUPER_INFO_OFFSET); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 292 | if (ret != sizeof(struct btrfs_super_block)) |
Chris Mason | d97e63b | 2007-02-20 16:40:44 -0500 | [diff] [blame] | 293 | return NULL; |
| 294 | } |
| 295 | BUG_ON(ret < 0); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 296 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 297 | __setup_root(super, tree_root, BTRFS_ROOT_TREE_OBJECTID, fp); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 298 | tree_root->node = read_tree_block(tree_root, btrfs_super_root(super)); |
| 299 | BUG_ON(!tree_root->node); |
| 300 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 301 | ret = find_and_setup_root(super, tree_root, BTRFS_EXTENT_TREE_OBJECTID, |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 302 | extent_root, fp); |
| 303 | BUG_ON(ret); |
| 304 | |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 305 | ret = find_and_setup_root(super, tree_root, BTRFS_FS_TREE_OBJECTID, |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 306 | root, fp); |
| 307 | BUG_ON(ret); |
| 308 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 309 | root->commit_root = root->node; |
| 310 | root->node->count++; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 311 | root->ref_cows = 1; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 312 | return root; |
| 313 | } |
| 314 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 315 | int write_ctree_super(struct btrfs_root *root, struct btrfs_super_block *s) |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 316 | { |
| 317 | int ret; |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 318 | btrfs_set_super_root(s, root->tree_root->node->blocknr); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 319 | ret = pwrite(root->fp, s, sizeof(*s), |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame^] | 320 | BTRFS_SUPER_INFO_OFFSET); |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 321 | if (ret != sizeof(*s)) { |
| 322 | fprintf(stderr, "failed to write new super block err %d\n", ret); |
| 323 | return ret; |
| 324 | } |
| 325 | return 0; |
| 326 | } |
| 327 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 328 | static int drop_cache(struct btrfs_root *root) |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 329 | { |
| 330 | while(!list_empty(&root->cache)) { |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 331 | struct btrfs_buffer *b = list_entry(root->cache.next, |
| 332 | struct btrfs_buffer, cache); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 333 | list_del_init(&b->cache); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 334 | btrfs_block_release(root, b); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 335 | } |
| 336 | return 0; |
| 337 | } |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 338 | int close_ctree(struct btrfs_root *root, struct btrfs_super_block *s) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 339 | { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 340 | int ret; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 341 | btrfs_commit_transaction(root, s); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 342 | ret = commit_extent_and_tree_roots(root->tree_root, root->extent_root); |
| 343 | BUG_ON(ret); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 344 | write_ctree_super(root, s); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 345 | drop_cache(root->extent_root); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 346 | drop_cache(root->tree_root); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 347 | drop_cache(root); |
| 348 | BUG_ON(!list_empty(&root->trans)); |
| 349 | BUG_ON(!list_empty(&root->extent_root->trans)); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 350 | BUG_ON(!list_empty(&root->tree_root->trans)); |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 351 | |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 352 | close(root->fp); |
| 353 | if (root->node) |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 354 | btrfs_block_release(root, root->node); |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 355 | if (root->extent_root->node) |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 356 | btrfs_block_release(root->extent_root, root->extent_root->node); |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 357 | if (root->tree_root->node) |
| 358 | btrfs_block_release(root->tree_root, root->tree_root->node); |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 359 | btrfs_block_release(root, root->commit_root); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 360 | free(root); |
| 361 | printf("on close %d blocks are allocated\n", allocated_blocks); |
| 362 | return 0; |
| 363 | } |
| 364 | |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 365 | void btrfs_block_release(struct btrfs_root *root, struct btrfs_buffer *buf) |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 366 | { |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 367 | buf->count--; |
Chris Mason | cfaa729 | 2007-02-21 17:04:57 -0500 | [diff] [blame] | 368 | if (buf->count < 0) |
| 369 | BUG(); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 370 | if (buf->count == 0) { |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 371 | BUG_ON(!list_empty(&buf->cache)); |
| 372 | BUG_ON(!list_empty(&buf->dirty)); |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 373 | if (!radix_tree_lookup(&root->cache_radix, buf->blocknr)) |
| 374 | BUG(); |
| 375 | radix_tree_delete(&root->cache_radix, buf->blocknr); |
| 376 | memset(buf, 0, sizeof(*buf)); |
| 377 | free(buf); |
| 378 | BUG_ON(allocated_blocks == 0); |
| 379 | allocated_blocks--; |
Chris Mason | ed2ff2c | 2007-03-01 18:59:40 -0500 | [diff] [blame] | 380 | BUG_ON(root->cache_size == 0); |
| 381 | root->cache_size--; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 382 | } |
| 383 | } |
| 384 | |