Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 19 | #include "ctree.h" |
| 20 | #include "disk-io.h" |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 21 | #include "hash.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 22 | #include "transaction.h" |
Chris Mason | 727011e | 2010-08-06 13:21:20 -0400 | [diff] [blame] | 23 | #include "print-tree.h" |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 24 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 25 | static int find_name_in_backref(struct btrfs_path *path, const char *name, |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 26 | int name_len, struct btrfs_inode_ref **ref_ret) |
| 27 | { |
| 28 | struct extent_buffer *leaf; |
| 29 | struct btrfs_inode_ref *ref; |
| 30 | unsigned long ptr; |
| 31 | unsigned long name_ptr; |
| 32 | u32 item_size; |
| 33 | u32 cur_offset = 0; |
| 34 | int len; |
| 35 | |
| 36 | leaf = path->nodes[0]; |
| 37 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 38 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 39 | while (cur_offset < item_size) { |
| 40 | ref = (struct btrfs_inode_ref *)(ptr + cur_offset); |
| 41 | len = btrfs_inode_ref_name_len(leaf, ref); |
| 42 | name_ptr = (unsigned long)(ref + 1); |
| 43 | cur_offset += len + sizeof(*ref); |
| 44 | if (len != name_len) |
| 45 | continue; |
| 46 | if (memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) { |
| 47 | *ref_ret = ref; |
| 48 | return 1; |
| 49 | } |
| 50 | } |
| 51 | return 0; |
| 52 | } |
| 53 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 54 | int btrfs_find_name_in_ext_backref(struct btrfs_path *path, u64 ref_objectid, |
| 55 | const char *name, int name_len, |
| 56 | struct btrfs_inode_extref **extref_ret) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 57 | { |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 58 | struct extent_buffer *leaf; |
| 59 | struct btrfs_inode_extref *extref; |
| 60 | unsigned long ptr; |
| 61 | unsigned long name_ptr; |
| 62 | u32 item_size; |
| 63 | u32 cur_offset = 0; |
| 64 | int ref_name_len; |
| 65 | |
| 66 | leaf = path->nodes[0]; |
| 67 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 68 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 69 | |
| 70 | /* |
| 71 | * Search all extended backrefs in this item. We're only |
| 72 | * looking through any collisions so most of the time this is |
| 73 | * just going to compare against one buffer. If all is well, |
| 74 | * we'll return success and the inode ref object. |
| 75 | */ |
| 76 | while (cur_offset < item_size) { |
| 77 | extref = (struct btrfs_inode_extref *) (ptr + cur_offset); |
| 78 | name_ptr = (unsigned long)(&extref->name); |
| 79 | ref_name_len = btrfs_inode_extref_name_len(leaf, extref); |
| 80 | |
| 81 | if (ref_name_len == name_len && |
| 82 | btrfs_inode_extref_parent(leaf, extref) == ref_objectid && |
| 83 | (memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)) { |
| 84 | if (extref_ret) |
| 85 | *extref_ret = extref; |
| 86 | return 1; |
| 87 | } |
| 88 | |
| 89 | cur_offset += ref_name_len + sizeof(*extref); |
| 90 | } |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | static struct btrfs_inode_ref * |
| 95 | btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans, |
| 96 | struct btrfs_root *root, |
| 97 | struct btrfs_path *path, |
| 98 | const char *name, int name_len, |
| 99 | u64 inode_objectid, u64 ref_objectid, int ins_len, |
| 100 | int cow) |
| 101 | { |
| 102 | int ret; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 103 | struct btrfs_key key; |
| 104 | struct btrfs_inode_ref *ref; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 105 | |
| 106 | key.objectid = inode_objectid; |
| 107 | key.type = BTRFS_INODE_REF_KEY; |
| 108 | key.offset = ref_objectid; |
| 109 | |
| 110 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 111 | if (ret < 0) |
| 112 | return ERR_PTR(ret); |
| 113 | if (ret > 0) |
| 114 | return NULL; |
| 115 | if (!find_name_in_backref(path, name, name_len, &ref)) |
| 116 | return NULL; |
| 117 | return ref; |
| 118 | } |
| 119 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 120 | /* Returns NULL if no extref found */ |
| 121 | struct btrfs_inode_extref * |
| 122 | btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans, |
| 123 | struct btrfs_root *root, |
| 124 | struct btrfs_path *path, |
| 125 | const char *name, int name_len, |
| 126 | u64 inode_objectid, u64 ref_objectid, int ins_len, |
| 127 | int cow) |
| 128 | { |
| 129 | int ret; |
| 130 | struct btrfs_key key; |
| 131 | struct btrfs_inode_extref *extref; |
| 132 | |
| 133 | key.objectid = inode_objectid; |
| 134 | key.type = BTRFS_INODE_EXTREF_KEY; |
| 135 | key.offset = btrfs_extref_hash(ref_objectid, name, name_len); |
| 136 | |
| 137 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
| 138 | if (ret < 0) |
| 139 | return ERR_PTR(ret); |
| 140 | if (ret > 0) |
| 141 | return NULL; |
| 142 | if (!btrfs_find_name_in_ext_backref(path, ref_objectid, name, name_len, &extref)) |
| 143 | return NULL; |
| 144 | return extref; |
| 145 | } |
| 146 | |
| 147 | int btrfs_get_inode_ref_index(struct btrfs_trans_handle *trans, |
| 148 | struct btrfs_root *root, |
| 149 | struct btrfs_path *path, |
| 150 | const char *name, int name_len, |
| 151 | u64 inode_objectid, u64 ref_objectid, int mod, |
| 152 | u64 *ret_index) |
| 153 | { |
| 154 | struct btrfs_inode_ref *ref; |
| 155 | struct btrfs_inode_extref *extref; |
| 156 | int ins_len = mod < 0 ? -1 : 0; |
| 157 | int cow = mod != 0; |
| 158 | |
| 159 | ref = btrfs_lookup_inode_ref(trans, root, path, name, name_len, |
| 160 | inode_objectid, ref_objectid, ins_len, |
| 161 | cow); |
| 162 | if (IS_ERR(ref)) |
| 163 | return PTR_ERR(ref); |
| 164 | |
| 165 | if (ref != NULL) { |
| 166 | *ret_index = btrfs_inode_ref_index(path->nodes[0], ref); |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | btrfs_release_path(path); |
| 171 | |
| 172 | extref = btrfs_lookup_inode_extref(trans, root, path, name, |
| 173 | name_len, inode_objectid, |
| 174 | ref_objectid, ins_len, cow); |
| 175 | if (IS_ERR(extref)) |
| 176 | return PTR_ERR(extref); |
| 177 | |
| 178 | if (extref) { |
| 179 | *ret_index = btrfs_inode_extref_index(path->nodes[0], extref); |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | return -ENOENT; |
| 184 | } |
| 185 | |
| 186 | int btrfs_del_inode_extref(struct btrfs_trans_handle *trans, |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 187 | struct btrfs_root *root, |
| 188 | const char *name, int name_len, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 189 | u64 inode_objectid, u64 ref_objectid, u64 *index) |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 190 | { |
| 191 | struct btrfs_path *path; |
| 192 | struct btrfs_key key; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 193 | struct btrfs_inode_extref *extref; |
| 194 | struct extent_buffer *leaf; |
| 195 | int ret; |
| 196 | int del_len = name_len + sizeof(*extref); |
| 197 | unsigned long ptr; |
| 198 | unsigned long item_start; |
| 199 | u32 item_size; |
| 200 | |
| 201 | key.objectid = inode_objectid; |
| 202 | btrfs_set_key_type(&key, BTRFS_INODE_EXTREF_KEY); |
| 203 | key.offset = btrfs_extref_hash(ref_objectid, name, name_len); |
| 204 | |
| 205 | path = btrfs_alloc_path(); |
| 206 | if (!path) |
| 207 | return -ENOMEM; |
| 208 | |
| 209 | path->leave_spinning = 1; |
| 210 | |
| 211 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 212 | if (ret > 0) |
| 213 | ret = -ENOENT; |
| 214 | if (ret < 0) |
| 215 | goto out; |
| 216 | |
| 217 | /* |
| 218 | * Sanity check - did we find the right item for this name? |
| 219 | * This should always succeed so error here will make the FS |
| 220 | * readonly. |
| 221 | */ |
| 222 | if (!btrfs_find_name_in_ext_backref(path, ref_objectid, |
| 223 | name, name_len, &extref)) { |
| 224 | btrfs_std_error(root->fs_info, -ENOENT); |
| 225 | ret = -EROFS; |
| 226 | goto out; |
| 227 | } |
| 228 | |
| 229 | leaf = path->nodes[0]; |
| 230 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 231 | if (index) |
| 232 | *index = btrfs_inode_extref_index(leaf, extref); |
| 233 | |
| 234 | if (del_len == item_size) { |
| 235 | /* |
| 236 | * Common case only one ref in the item, remove the |
| 237 | * whole item. |
| 238 | */ |
| 239 | ret = btrfs_del_item(trans, root, path); |
| 240 | goto out; |
| 241 | } |
| 242 | |
| 243 | ptr = (unsigned long)extref; |
| 244 | item_start = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 245 | |
| 246 | memmove_extent_buffer(leaf, ptr, ptr + del_len, |
| 247 | item_size - (ptr + del_len - item_start)); |
| 248 | |
| 249 | btrfs_truncate_item(trans, root, path, item_size - del_len, 1); |
| 250 | |
| 251 | out: |
| 252 | btrfs_free_path(path); |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, |
| 258 | struct btrfs_root *root, |
| 259 | const char *name, int name_len, |
| 260 | u64 inode_objectid, u64 ref_objectid, u64 *index) |
| 261 | { |
| 262 | struct btrfs_path *path; |
| 263 | struct btrfs_key key; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 264 | struct btrfs_inode_ref *ref; |
| 265 | struct extent_buffer *leaf; |
| 266 | unsigned long ptr; |
| 267 | unsigned long item_start; |
| 268 | u32 item_size; |
| 269 | u32 sub_item_len; |
| 270 | int ret; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 271 | int search_ext_refs = 0; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 272 | int del_len = name_len + sizeof(*ref); |
| 273 | |
| 274 | key.objectid = inode_objectid; |
| 275 | key.offset = ref_objectid; |
| 276 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); |
| 277 | |
| 278 | path = btrfs_alloc_path(); |
| 279 | if (!path) |
| 280 | return -ENOMEM; |
| 281 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 282 | path->leave_spinning = 1; |
| 283 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 284 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 285 | if (ret > 0) { |
| 286 | ret = -ENOENT; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 287 | search_ext_refs = 1; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 288 | goto out; |
| 289 | } else if (ret < 0) { |
| 290 | goto out; |
| 291 | } |
| 292 | if (!find_name_in_backref(path, name, name_len, &ref)) { |
| 293 | ret = -ENOENT; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 294 | search_ext_refs = 1; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 295 | goto out; |
| 296 | } |
| 297 | leaf = path->nodes[0]; |
| 298 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 299 | |
| 300 | if (index) |
| 301 | *index = btrfs_inode_ref_index(leaf, ref); |
| 302 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 303 | if (del_len == item_size) { |
| 304 | ret = btrfs_del_item(trans, root, path); |
| 305 | goto out; |
| 306 | } |
| 307 | ptr = (unsigned long)ref; |
| 308 | sub_item_len = name_len + sizeof(*ref); |
| 309 | item_start = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 310 | memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, |
| 311 | item_size - (ptr + sub_item_len - item_start)); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 312 | btrfs_truncate_item(trans, root, path, item_size - sub_item_len, 1); |
| 313 | out: |
| 314 | btrfs_free_path(path); |
| 315 | |
| 316 | if (search_ext_refs) { |
| 317 | /* |
| 318 | * No refs were found, or we could not find the |
| 319 | * name in our ref array. Find and remove the extended |
| 320 | * inode ref then. |
| 321 | */ |
| 322 | return btrfs_del_inode_extref(trans, root, name, name_len, |
| 323 | inode_objectid, ref_objectid, index); |
| 324 | } |
| 325 | |
| 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * btrfs_insert_inode_extref() - Inserts an extended inode ref into a tree. |
| 331 | * |
| 332 | * The caller must have checked against BTRFS_LINK_MAX already. |
| 333 | */ |
| 334 | static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans, |
| 335 | struct btrfs_root *root, |
| 336 | const char *name, int name_len, |
| 337 | u64 inode_objectid, u64 ref_objectid, u64 index) |
| 338 | { |
| 339 | struct btrfs_inode_extref *extref; |
| 340 | int ret; |
| 341 | int ins_len = name_len + sizeof(*extref); |
| 342 | unsigned long ptr; |
| 343 | struct btrfs_path *path; |
| 344 | struct btrfs_key key; |
| 345 | struct extent_buffer *leaf; |
| 346 | struct btrfs_item *item; |
| 347 | |
| 348 | key.objectid = inode_objectid; |
| 349 | key.type = BTRFS_INODE_EXTREF_KEY; |
| 350 | key.offset = btrfs_extref_hash(ref_objectid, name, name_len); |
| 351 | |
| 352 | path = btrfs_alloc_path(); |
| 353 | if (!path) |
| 354 | return -ENOMEM; |
| 355 | |
| 356 | path->leave_spinning = 1; |
| 357 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 358 | ins_len); |
| 359 | if (ret == -EEXIST) { |
| 360 | if (btrfs_find_name_in_ext_backref(path, ref_objectid, |
| 361 | name, name_len, NULL)) |
| 362 | goto out; |
| 363 | |
| 364 | btrfs_extend_item(trans, root, path, ins_len); |
| 365 | ret = 0; |
| 366 | } |
| 367 | if (ret < 0) |
| 368 | goto out; |
| 369 | |
| 370 | leaf = path->nodes[0]; |
| 371 | item = btrfs_item_nr(leaf, path->slots[0]); |
| 372 | ptr = (unsigned long)btrfs_item_ptr(leaf, path->slots[0], char); |
| 373 | ptr += btrfs_item_size(leaf, item) - ins_len; |
| 374 | extref = (struct btrfs_inode_extref *)ptr; |
| 375 | |
| 376 | btrfs_set_inode_extref_name_len(path->nodes[0], extref, name_len); |
| 377 | btrfs_set_inode_extref_index(path->nodes[0], extref, index); |
| 378 | btrfs_set_inode_extref_parent(path->nodes[0], extref, ref_objectid); |
| 379 | |
| 380 | ptr = (unsigned long)&extref->name; |
| 381 | write_extent_buffer(path->nodes[0], name, ptr, name_len); |
| 382 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 383 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 384 | out: |
| 385 | btrfs_free_path(path); |
| 386 | return ret; |
| 387 | } |
| 388 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 389 | /* Will return 0, -ENOMEM, -EMLINK, or -EEXIST or anything from the CoW path */ |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 390 | int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, |
| 391 | struct btrfs_root *root, |
| 392 | const char *name, int name_len, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 393 | u64 inode_objectid, u64 ref_objectid, u64 index) |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 394 | { |
| 395 | struct btrfs_path *path; |
| 396 | struct btrfs_key key; |
| 397 | struct btrfs_inode_ref *ref; |
| 398 | unsigned long ptr; |
| 399 | int ret; |
| 400 | int ins_len = name_len + sizeof(*ref); |
| 401 | |
| 402 | key.objectid = inode_objectid; |
| 403 | key.offset = ref_objectid; |
| 404 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); |
| 405 | |
| 406 | path = btrfs_alloc_path(); |
| 407 | if (!path) |
| 408 | return -ENOMEM; |
| 409 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 410 | path->leave_spinning = 1; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 411 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 412 | ins_len); |
| 413 | if (ret == -EEXIST) { |
| 414 | u32 old_size; |
| 415 | |
| 416 | if (find_name_in_backref(path, name, name_len, &ref)) |
| 417 | goto out; |
| 418 | |
| 419 | old_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 420 | btrfs_extend_item(trans, root, path, ins_len); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 421 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 422 | struct btrfs_inode_ref); |
| 423 | ref = (struct btrfs_inode_ref *)((unsigned long)ref + old_size); |
| 424 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 425 | btrfs_set_inode_ref_index(path->nodes[0], ref, index); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 426 | ptr = (unsigned long)(ref + 1); |
| 427 | ret = 0; |
| 428 | } else if (ret < 0) { |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 429 | if (ret == -EOVERFLOW) |
| 430 | ret = -EMLINK; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 431 | goto out; |
| 432 | } else { |
| 433 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 434 | struct btrfs_inode_ref); |
| 435 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 436 | btrfs_set_inode_ref_index(path->nodes[0], ref, index); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 437 | ptr = (unsigned long)(ref + 1); |
| 438 | } |
| 439 | write_extent_buffer(path->nodes[0], name, ptr, name_len); |
| 440 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 441 | |
| 442 | out: |
| 443 | btrfs_free_path(path); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 444 | |
| 445 | if (ret == -EMLINK) { |
| 446 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
| 447 | /* We ran out of space in the ref array. Need to |
| 448 | * add an extended ref. */ |
| 449 | if (btrfs_super_incompat_flags(disk_super) |
| 450 | & BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF) |
| 451 | ret = btrfs_insert_inode_extref(trans, root, name, |
| 452 | name_len, |
| 453 | inode_objectid, |
| 454 | ref_objectid, index); |
| 455 | } |
| 456 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 457 | return ret; |
| 458 | } |
| 459 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 460 | int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, |
| 461 | struct btrfs_root *root, |
| 462 | struct btrfs_path *path, u64 objectid) |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 463 | { |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 464 | struct btrfs_key key; |
| 465 | int ret; |
| 466 | key.objectid = objectid; |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 467 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 468 | key.offset = 0; |
| 469 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 470 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 471 | sizeof(struct btrfs_inode_item)); |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 472 | return ret; |
| 473 | } |
| 474 | |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 475 | int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 476 | *root, struct btrfs_path *path, |
| 477 | struct btrfs_key *location, int mod) |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 478 | { |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 479 | int ins_len = mod < 0 ? -1 : 0; |
| 480 | int cow = mod != 0; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 481 | int ret; |
| 482 | int slot; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 483 | struct extent_buffer *leaf; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 484 | struct btrfs_key found_key; |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 485 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 486 | ret = btrfs_search_slot(trans, root, location, path, ins_len, cow); |
| 487 | if (ret > 0 && btrfs_key_type(location) == BTRFS_ROOT_ITEM_KEY && |
| 488 | location->offset == (u64)-1 && path->slots[0] != 0) { |
| 489 | slot = path->slots[0] - 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 490 | leaf = path->nodes[0]; |
| 491 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 492 | if (found_key.objectid == location->objectid && |
| 493 | btrfs_key_type(&found_key) == btrfs_key_type(location)) { |
| 494 | path->slots[0]--; |
| 495 | return 0; |
| 496 | } |
| 497 | } |
| 498 | return ret; |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 499 | } |