| 1 | /* |
| 2 | * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Matthew Dillon <dillon@backplane.com> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific, prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.47 2008/05/03 05:28:55 dillon Exp $ |
| 35 | */ |
| 36 | |
| 37 | #include "hammer.h" |
| 38 | #include <vm/vm_extern.h> |
| 39 | #include <sys/buf.h> |
| 40 | #include <sys/buf2.h> |
| 41 | |
| 42 | static int hammer_unload_inode(struct hammer_inode *ip); |
| 43 | static void hammer_flush_inode_core(hammer_inode_t ip, int flags); |
| 44 | static int hammer_setup_child_callback(hammer_record_t rec, void *data); |
| 45 | static void hammer_inode_unloadable_check(hammer_inode_t ip); |
| 46 | static int hammer_setup_parent_inodes(hammer_record_t record); |
| 47 | |
| 48 | /* |
| 49 | * The kernel is not actively referencing this vnode but is still holding |
| 50 | * it cached. |
| 51 | * |
| 52 | * This is called from the frontend. |
| 53 | */ |
| 54 | int |
| 55 | hammer_vop_inactive(struct vop_inactive_args *ap) |
| 56 | { |
| 57 | struct hammer_inode *ip = VTOI(ap->a_vp); |
| 58 | |
| 59 | /* |
| 60 | * Degenerate case |
| 61 | */ |
| 62 | if (ip == NULL) { |
| 63 | vrecycle(ap->a_vp); |
| 64 | return(0); |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * If the inode no longer has visibility in the filesystem and is |
| 69 | * fairly clean, try to recycle it immediately. This can deadlock |
| 70 | * in vfsync() if we aren't careful. |
| 71 | */ |
| 72 | hammer_inode_unloadable_check(ip); |
| 73 | if (ip->flags & HAMMER_INODE_MODMASK) |
| 74 | hammer_flush_inode(ip, 0); |
| 75 | else if (ip->ino_rec.ino_nlinks == 0) |
| 76 | vrecycle(ap->a_vp); |
| 77 | return(0); |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Release the vnode association. This is typically (but not always) |
| 82 | * the last reference on the inode. |
| 83 | * |
| 84 | * Once the association is lost we are on our own with regards to |
| 85 | * flushing the inode. |
| 86 | */ |
| 87 | int |
| 88 | hammer_vop_reclaim(struct vop_reclaim_args *ap) |
| 89 | { |
| 90 | struct hammer_inode *ip; |
| 91 | struct vnode *vp; |
| 92 | |
| 93 | vp = ap->a_vp; |
| 94 | |
| 95 | if ((ip = vp->v_data) != NULL) { |
| 96 | vp->v_data = NULL; |
| 97 | ip->vp = NULL; |
| 98 | hammer_rel_inode(ip, 1); |
| 99 | } |
| 100 | return(0); |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Return a locked vnode for the specified inode. The inode must be |
| 105 | * referenced but NOT LOCKED on entry and will remain referenced on |
| 106 | * return. |
| 107 | * |
| 108 | * Called from the frontend. |
| 109 | */ |
| 110 | int |
| 111 | hammer_get_vnode(struct hammer_inode *ip, int lktype, struct vnode **vpp) |
| 112 | { |
| 113 | struct vnode *vp; |
| 114 | int error = 0; |
| 115 | |
| 116 | for (;;) { |
| 117 | if ((vp = ip->vp) == NULL) { |
| 118 | error = getnewvnode(VT_HAMMER, ip->hmp->mp, vpp, 0, 0); |
| 119 | if (error) |
| 120 | break; |
| 121 | hammer_lock_ex(&ip->lock); |
| 122 | if (ip->vp != NULL) { |
| 123 | hammer_unlock(&ip->lock); |
| 124 | vp->v_type = VBAD; |
| 125 | vx_put(vp); |
| 126 | continue; |
| 127 | } |
| 128 | hammer_ref(&ip->lock); |
| 129 | vp = *vpp; |
| 130 | ip->vp = vp; |
| 131 | vp->v_type = hammer_get_vnode_type( |
| 132 | ip->ino_rec.base.base.obj_type); |
| 133 | |
| 134 | switch(ip->ino_rec.base.base.obj_type) { |
| 135 | case HAMMER_OBJTYPE_CDEV: |
| 136 | case HAMMER_OBJTYPE_BDEV: |
| 137 | vp->v_ops = &ip->hmp->mp->mnt_vn_spec_ops; |
| 138 | addaliasu(vp, ip->ino_data.rmajor, |
| 139 | ip->ino_data.rminor); |
| 140 | break; |
| 141 | case HAMMER_OBJTYPE_FIFO: |
| 142 | vp->v_ops = &ip->hmp->mp->mnt_vn_fifo_ops; |
| 143 | break; |
| 144 | default: |
| 145 | break; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Only mark as the root vnode if the ip is not |
| 150 | * historical, otherwise the VFS cache will get |
| 151 | * confused. The other half of the special handling |
| 152 | * is in hammer_vop_nlookupdotdot(). |
| 153 | */ |
| 154 | if (ip->obj_id == HAMMER_OBJID_ROOT && |
| 155 | ip->obj_asof == ip->hmp->asof) { |
| 156 | vp->v_flag |= VROOT; |
| 157 | } |
| 158 | |
| 159 | vp->v_data = (void *)ip; |
| 160 | /* vnode locked by getnewvnode() */ |
| 161 | /* make related vnode dirty if inode dirty? */ |
| 162 | hammer_unlock(&ip->lock); |
| 163 | if (vp->v_type == VREG) |
| 164 | vinitvmio(vp, ip->ino_rec.ino_size); |
| 165 | break; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * loop if the vget fails (aka races), or if the vp |
| 170 | * no longer matches ip->vp. |
| 171 | */ |
| 172 | if (vget(vp, LK_EXCLUSIVE) == 0) { |
| 173 | if (vp == ip->vp) |
| 174 | break; |
| 175 | vput(vp); |
| 176 | } |
| 177 | } |
| 178 | *vpp = vp; |
| 179 | return(error); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Acquire a HAMMER inode. The returned inode is not locked. These functions |
| 184 | * do not attach or detach the related vnode (use hammer_get_vnode() for |
| 185 | * that). |
| 186 | * |
| 187 | * The flags argument is only applied for newly created inodes, and only |
| 188 | * certain flags are inherited. |
| 189 | * |
| 190 | * Called from the frontend. |
| 191 | */ |
| 192 | struct hammer_inode * |
| 193 | hammer_get_inode(hammer_transaction_t trans, struct hammer_node **cache, |
| 194 | u_int64_t obj_id, hammer_tid_t asof, int flags, int *errorp) |
| 195 | { |
| 196 | hammer_mount_t hmp = trans->hmp; |
| 197 | struct hammer_inode_info iinfo; |
| 198 | struct hammer_cursor cursor; |
| 199 | struct hammer_inode *ip; |
| 200 | |
| 201 | /* |
| 202 | * Determine if we already have an inode cached. If we do then |
| 203 | * we are golden. |
| 204 | */ |
| 205 | iinfo.obj_id = obj_id; |
| 206 | iinfo.obj_asof = asof; |
| 207 | loop: |
| 208 | ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); |
| 209 | if (ip) { |
| 210 | hammer_ref(&ip->lock); |
| 211 | *errorp = 0; |
| 212 | return(ip); |
| 213 | } |
| 214 | |
| 215 | ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO); |
| 216 | ++hammer_count_inodes; |
| 217 | ip->obj_id = obj_id; |
| 218 | ip->obj_asof = iinfo.obj_asof; |
| 219 | ip->hmp = hmp; |
| 220 | ip->flags = flags & HAMMER_INODE_RO; |
| 221 | if (hmp->ronly) |
| 222 | ip->flags |= HAMMER_INODE_RO; |
| 223 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 224 | RB_INIT(&ip->rec_tree); |
| 225 | TAILQ_INIT(&ip->bio_list); |
| 226 | TAILQ_INIT(&ip->bio_alt_list); |
| 227 | TAILQ_INIT(&ip->target_list); |
| 228 | |
| 229 | /* |
| 230 | * Locate the on-disk inode. |
| 231 | */ |
| 232 | retry: |
| 233 | hammer_init_cursor(trans, &cursor, cache, NULL); |
| 234 | cursor.key_beg.obj_id = ip->obj_id; |
| 235 | cursor.key_beg.key = 0; |
| 236 | cursor.key_beg.create_tid = 0; |
| 237 | cursor.key_beg.delete_tid = 0; |
| 238 | cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 239 | cursor.key_beg.obj_type = 0; |
| 240 | cursor.asof = iinfo.obj_asof; |
| 241 | cursor.flags = HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_GET_DATA | |
| 242 | HAMMER_CURSOR_ASOF; |
| 243 | |
| 244 | *errorp = hammer_btree_lookup(&cursor); |
| 245 | if (*errorp == EDEADLK) { |
| 246 | hammer_done_cursor(&cursor); |
| 247 | goto retry; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * On success the B-Tree lookup will hold the appropriate |
| 252 | * buffer cache buffers and provide a pointer to the requested |
| 253 | * information. Copy the information to the in-memory inode |
| 254 | * and cache the B-Tree node to improve future operations. |
| 255 | */ |
| 256 | if (*errorp == 0) { |
| 257 | ip->ino_rec = cursor.record->inode; |
| 258 | ip->ino_data = cursor.data->inode; |
| 259 | hammer_cache_node(cursor.node, &ip->cache[0]); |
| 260 | if (cache) |
| 261 | hammer_cache_node(cursor.node, cache); |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * On success load the inode's record and data and insert the |
| 266 | * inode into the B-Tree. It is possible to race another lookup |
| 267 | * insertion of the same inode so deal with that condition too. |
| 268 | * |
| 269 | * The cursor's locked node interlocks against others creating and |
| 270 | * destroying ip while we were blocked. |
| 271 | */ |
| 272 | if (*errorp == 0) { |
| 273 | hammer_ref(&ip->lock); |
| 274 | if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { |
| 275 | hammer_uncache_node(&ip->cache[0]); |
| 276 | hammer_uncache_node(&ip->cache[1]); |
| 277 | KKASSERT(ip->lock.refs == 1); |
| 278 | --hammer_count_inodes; |
| 279 | kfree(ip, M_HAMMER); |
| 280 | hammer_done_cursor(&cursor); |
| 281 | goto loop; |
| 282 | } |
| 283 | ip->flags |= HAMMER_INODE_ONDISK; |
| 284 | } else { |
| 285 | --hammer_count_inodes; |
| 286 | kfree(ip, M_HAMMER); |
| 287 | ip = NULL; |
| 288 | } |
| 289 | hammer_done_cursor(&cursor); |
| 290 | return (ip); |
| 291 | } |
| 292 | |
| 293 | /* |
| 294 | * Create a new filesystem object, returning the inode in *ipp. The |
| 295 | * returned inode will be referenced. |
| 296 | * |
| 297 | * The inode is created in-memory. |
| 298 | */ |
| 299 | int |
| 300 | hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, |
| 301 | struct ucred *cred, hammer_inode_t dip, |
| 302 | struct hammer_inode **ipp) |
| 303 | { |
| 304 | hammer_mount_t hmp; |
| 305 | hammer_inode_t ip; |
| 306 | uid_t xuid; |
| 307 | |
| 308 | hmp = trans->hmp; |
| 309 | ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO); |
| 310 | ++hammer_count_inodes; |
| 311 | ip->obj_id = hammer_alloc_objid(trans, dip); |
| 312 | KKASSERT(ip->obj_id != 0); |
| 313 | ip->obj_asof = hmp->asof; |
| 314 | ip->hmp = hmp; |
| 315 | ip->flush_state = HAMMER_FST_IDLE; |
| 316 | ip->flags = HAMMER_INODE_DDIRTY | HAMMER_INODE_RDIRTY | |
| 317 | HAMMER_INODE_ITIMES; |
| 318 | |
| 319 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 320 | RB_INIT(&ip->rec_tree); |
| 321 | TAILQ_INIT(&ip->bio_list); |
| 322 | TAILQ_INIT(&ip->bio_alt_list); |
| 323 | TAILQ_INIT(&ip->target_list); |
| 324 | |
| 325 | ip->ino_rec.ino_atime = trans->time; |
| 326 | ip->ino_rec.ino_mtime = trans->time; |
| 327 | ip->ino_rec.ino_size = 0; |
| 328 | ip->ino_rec.ino_nlinks = 0; |
| 329 | /* XXX */ |
| 330 | ip->ino_rec.base.base.btype = HAMMER_BTREE_TYPE_RECORD; |
| 331 | ip->ino_rec.base.base.obj_id = ip->obj_id; |
| 332 | ip->ino_rec.base.base.key = 0; |
| 333 | ip->ino_rec.base.base.create_tid = 0; |
| 334 | ip->ino_rec.base.base.delete_tid = 0; |
| 335 | ip->ino_rec.base.base.rec_type = HAMMER_RECTYPE_INODE; |
| 336 | ip->ino_rec.base.base.obj_type = hammer_get_obj_type(vap->va_type); |
| 337 | |
| 338 | ip->ino_data.version = HAMMER_INODE_DATA_VERSION; |
| 339 | ip->ino_data.mode = vap->va_mode; |
| 340 | ip->ino_data.ctime = trans->time; |
| 341 | ip->ino_data.parent_obj_id = (dip) ? dip->ino_rec.base.base.obj_id : 0; |
| 342 | |
| 343 | switch(ip->ino_rec.base.base.obj_type) { |
| 344 | case HAMMER_OBJTYPE_CDEV: |
| 345 | case HAMMER_OBJTYPE_BDEV: |
| 346 | ip->ino_data.rmajor = vap->va_rmajor; |
| 347 | ip->ino_data.rminor = vap->va_rminor; |
| 348 | break; |
| 349 | default: |
| 350 | break; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Calculate default uid/gid and overwrite with information from |
| 355 | * the vap. |
| 356 | */ |
| 357 | xuid = hammer_to_unix_xid(&dip->ino_data.uid); |
| 358 | ip->ino_data.gid = dip->ino_data.gid; |
| 359 | xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, xuid, cred, |
| 360 | &vap->va_mode); |
| 361 | ip->ino_data.mode = vap->va_mode; |
| 362 | |
| 363 | if (vap->va_vaflags & VA_UID_UUID_VALID) |
| 364 | ip->ino_data.uid = vap->va_uid_uuid; |
| 365 | else if (vap->va_uid != (uid_t)VNOVAL) |
| 366 | hammer_guid_to_uuid(&ip->ino_data.uid, xuid); |
| 367 | if (vap->va_vaflags & VA_GID_UUID_VALID) |
| 368 | ip->ino_data.gid = vap->va_gid_uuid; |
| 369 | else if (vap->va_gid != (gid_t)VNOVAL) |
| 370 | hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); |
| 371 | |
| 372 | hammer_ref(&ip->lock); |
| 373 | if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { |
| 374 | hammer_unref(&ip->lock); |
| 375 | panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id); |
| 376 | } |
| 377 | *ipp = ip; |
| 378 | return(0); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Called by hammer_sync_inode(). |
| 383 | */ |
| 384 | static int |
| 385 | hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) |
| 386 | { |
| 387 | hammer_transaction_t trans = cursor->trans; |
| 388 | hammer_record_t record; |
| 389 | int error; |
| 390 | |
| 391 | retry: |
| 392 | error = 0; |
| 393 | |
| 394 | /* |
| 395 | * If the inode has a presence on-disk then locate it and mark |
| 396 | * it deleted, setting DELONDISK. |
| 397 | * |
| 398 | * The record may or may not be physically deleted, depending on |
| 399 | * the retention policy. |
| 400 | */ |
| 401 | if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == |
| 402 | HAMMER_INODE_ONDISK) { |
| 403 | hammer_normalize_cursor(cursor); |
| 404 | cursor->key_beg.obj_id = ip->obj_id; |
| 405 | cursor->key_beg.key = 0; |
| 406 | cursor->key_beg.create_tid = 0; |
| 407 | cursor->key_beg.delete_tid = 0; |
| 408 | cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 409 | cursor->key_beg.obj_type = 0; |
| 410 | cursor->asof = ip->obj_asof; |
| 411 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 412 | cursor->flags |= HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_ASOF; |
| 413 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 414 | |
| 415 | error = hammer_btree_lookup(cursor); |
| 416 | if (error) { |
| 417 | kprintf("error %d\n", error); |
| 418 | Debugger("hammer_update_inode"); |
| 419 | } |
| 420 | |
| 421 | if (error == 0) { |
| 422 | error = hammer_ip_delete_record(cursor, trans->tid); |
| 423 | if (error && error != EDEADLK) { |
| 424 | kprintf("error %d\n", error); |
| 425 | Debugger("hammer_update_inode2"); |
| 426 | } |
| 427 | if (error == 0) { |
| 428 | ip->flags |= HAMMER_INODE_DELONDISK; |
| 429 | } |
| 430 | hammer_cache_node(cursor->node, &ip->cache[0]); |
| 431 | } |
| 432 | if (error == EDEADLK) { |
| 433 | hammer_done_cursor(cursor); |
| 434 | error = hammer_init_cursor(trans, cursor, |
| 435 | &ip->cache[0], ip); |
| 436 | if (error == 0) |
| 437 | goto retry; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Ok, write out the initial record or a new record (after deleting |
| 443 | * the old one), unless the DELETED flag is set. This routine will |
| 444 | * clear DELONDISK if it writes out a record. |
| 445 | * |
| 446 | * Update our inode statistics if this is the first application of |
| 447 | * the inode on-disk. |
| 448 | */ |
| 449 | if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { |
| 450 | /* |
| 451 | * Generate a record and write it to the media |
| 452 | */ |
| 453 | record = hammer_alloc_mem_record(ip); |
| 454 | record->flush_state = HAMMER_FST_FLUSH; |
| 455 | record->rec.inode = ip->sync_ino_rec; |
| 456 | record->rec.inode.base.base.create_tid = trans->tid; |
| 457 | record->rec.inode.base.data_len = sizeof(ip->sync_ino_data); |
| 458 | record->data = (void *)&ip->sync_ino_data; |
| 459 | record->flags |= HAMMER_RECF_INTERLOCK_BE; |
| 460 | for (;;) { |
| 461 | error = hammer_ip_sync_record_cursor(cursor, record); |
| 462 | if (error != EDEADLK) |
| 463 | break; |
| 464 | hammer_done_cursor(cursor); |
| 465 | error = hammer_init_cursor(trans, cursor, |
| 466 | &ip->cache[0], ip); |
| 467 | if (error) |
| 468 | break; |
| 469 | } |
| 470 | if (error) { |
| 471 | kprintf("error %d\n", error); |
| 472 | Debugger("hammer_update_inode3"); |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * The record isn't managed by the inode's record tree, |
| 477 | * destroy it whether we succeed or fail. |
| 478 | */ |
| 479 | record->flags &= ~HAMMER_RECF_INTERLOCK_BE; |
| 480 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 481 | record->flush_state = HAMMER_FST_IDLE; |
| 482 | hammer_rel_mem_record(record); |
| 483 | |
| 484 | /* |
| 485 | * Finish up. |
| 486 | */ |
| 487 | if (error == 0) { |
| 488 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY | |
| 489 | HAMMER_INODE_DDIRTY | |
| 490 | HAMMER_INODE_ITIMES); |
| 491 | ip->flags &= ~HAMMER_INODE_DELONDISK; |
| 492 | |
| 493 | /* |
| 494 | * Root volume count of inodes |
| 495 | */ |
| 496 | if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { |
| 497 | hammer_modify_volume(trans, trans->rootvol, |
| 498 | NULL, 0); |
| 499 | ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 500 | hammer_modify_volume_done(trans->rootvol); |
| 501 | ip->flags |= HAMMER_INODE_ONDISK; |
| 502 | } |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * If the inode has been destroyed, clean out any left-over flags |
| 508 | * that may have been set by the frontend. |
| 509 | */ |
| 510 | if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { |
| 511 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY | |
| 512 | HAMMER_INODE_DDIRTY | |
| 513 | HAMMER_INODE_ITIMES); |
| 514 | } |
| 515 | return(error); |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Update only the itimes fields. This is done no-historically. The |
| 520 | * record is updated in-place on the disk. |
| 521 | */ |
| 522 | static int |
| 523 | hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) |
| 524 | { |
| 525 | hammer_transaction_t trans = cursor->trans; |
| 526 | struct hammer_inode_record *rec; |
| 527 | int error; |
| 528 | |
| 529 | retry: |
| 530 | error = 0; |
| 531 | if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == |
| 532 | HAMMER_INODE_ONDISK) { |
| 533 | hammer_normalize_cursor(cursor); |
| 534 | cursor->key_beg.obj_id = ip->obj_id; |
| 535 | cursor->key_beg.key = 0; |
| 536 | cursor->key_beg.create_tid = 0; |
| 537 | cursor->key_beg.delete_tid = 0; |
| 538 | cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 539 | cursor->key_beg.obj_type = 0; |
| 540 | cursor->asof = ip->obj_asof; |
| 541 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 542 | cursor->flags |= HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_ASOF; |
| 543 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 544 | |
| 545 | error = hammer_btree_lookup(cursor); |
| 546 | if (error) { |
| 547 | kprintf("error %d\n", error); |
| 548 | Debugger("hammer_update_itimes1"); |
| 549 | } |
| 550 | if (error == 0) { |
| 551 | /* |
| 552 | * Do not generate UNDO records for atime/mtime |
| 553 | * updates. |
| 554 | */ |
| 555 | rec = &cursor->record->inode; |
| 556 | hammer_modify_buffer(trans, cursor->record_buffer, |
| 557 | NULL, 0); |
| 558 | rec->ino_atime = ip->sync_ino_rec.ino_atime; |
| 559 | rec->ino_mtime = ip->sync_ino_rec.ino_mtime; |
| 560 | hammer_modify_buffer_done(cursor->record_buffer); |
| 561 | ip->sync_flags &= ~HAMMER_INODE_ITIMES; |
| 562 | /* XXX recalculate crc */ |
| 563 | hammer_cache_node(cursor->node, &ip->cache[0]); |
| 564 | } |
| 565 | if (error == EDEADLK) { |
| 566 | hammer_done_cursor(cursor); |
| 567 | error = hammer_init_cursor(trans, cursor, |
| 568 | &ip->cache[0], ip); |
| 569 | if (error == 0) |
| 570 | goto retry; |
| 571 | } |
| 572 | } |
| 573 | return(error); |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * Release a reference on an inode, flush as requested. |
| 578 | * |
| 579 | * On the last reference we queue the inode to the flusher for its final |
| 580 | * disposition. |
| 581 | */ |
| 582 | void |
| 583 | hammer_rel_inode(struct hammer_inode *ip, int flush) |
| 584 | { |
| 585 | hammer_mount_t hmp = ip->hmp; |
| 586 | |
| 587 | /* |
| 588 | * Handle disposition when dropping the last ref. |
| 589 | */ |
| 590 | for (;;) { |
| 591 | if (ip->lock.refs == 1) { |
| 592 | /* |
| 593 | * Determine whether on-disk action is needed for |
| 594 | * the inode's final disposition. |
| 595 | */ |
| 596 | hammer_inode_unloadable_check(ip); |
| 597 | if (ip->flags & HAMMER_INODE_MODMASK) { |
| 598 | hammer_flush_inode(ip, 0); |
| 599 | } else if (ip->lock.refs == 1) { |
| 600 | hammer_unload_inode(ip); |
| 601 | break; |
| 602 | } |
| 603 | } else { |
| 604 | if (flush) |
| 605 | hammer_flush_inode(ip, 0); |
| 606 | |
| 607 | /* |
| 608 | * The inode still has multiple refs, try to drop |
| 609 | * one ref. |
| 610 | */ |
| 611 | KKASSERT(ip->lock.refs >= 1); |
| 612 | if (ip->lock.refs > 1) { |
| 613 | hammer_unref(&ip->lock); |
| 614 | break; |
| 615 | } |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * XXX bad hack until I add code to track inodes in SETUP. We |
| 621 | * can queue a lot of inodes to the syncer but if we don't wake |
| 622 | * it up the undo sets will be too large or too many unflushed |
| 623 | * records will build up and blow our malloc limit. |
| 624 | */ |
| 625 | if (++hmp->reclaim_count > 256) { |
| 626 | hmp->reclaim_count = 0; |
| 627 | hammer_flusher_async(hmp); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | /* |
| 632 | * Unload and destroy the specified inode. Must be called with one remaining |
| 633 | * reference. The reference is disposed of. |
| 634 | * |
| 635 | * This can only be called in the context of the flusher. |
| 636 | */ |
| 637 | static int |
| 638 | hammer_unload_inode(struct hammer_inode *ip) |
| 639 | { |
| 640 | KASSERT(ip->lock.refs == 1, |
| 641 | ("hammer_unload_inode: %d refs\n", ip->lock.refs)); |
| 642 | KKASSERT(ip->vp == NULL); |
| 643 | KKASSERT(ip->flush_state == HAMMER_FST_IDLE); |
| 644 | KKASSERT(ip->cursor_ip_refs == 0); |
| 645 | KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); |
| 646 | |
| 647 | KKASSERT(RB_EMPTY(&ip->rec_tree)); |
| 648 | KKASSERT(TAILQ_EMPTY(&ip->target_list)); |
| 649 | KKASSERT(TAILQ_EMPTY(&ip->bio_list)); |
| 650 | KKASSERT(TAILQ_EMPTY(&ip->bio_alt_list)); |
| 651 | |
| 652 | RB_REMOVE(hammer_ino_rb_tree, &ip->hmp->rb_inos_root, ip); |
| 653 | |
| 654 | hammer_uncache_node(&ip->cache[0]); |
| 655 | hammer_uncache_node(&ip->cache[1]); |
| 656 | if (ip->objid_cache) |
| 657 | hammer_clear_objid(ip); |
| 658 | --hammer_count_inodes; |
| 659 | kfree(ip, M_HAMMER); |
| 660 | |
| 661 | return(0); |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * A transaction has modified an inode, requiring updates as specified by |
| 666 | * the passed flags. |
| 667 | * |
| 668 | * HAMMER_INODE_RDIRTY: Inode record has been updated |
| 669 | * HAMMER_INODE_DDIRTY: Inode data has been updated |
| 670 | * HAMMER_INODE_XDIRTY: Dirty in-memory records |
| 671 | * HAMMER_INODE_BUFS: Dirty buffer cache buffers |
| 672 | * HAMMER_INODE_DELETED: Inode record/data must be deleted |
| 673 | * HAMMER_INODE_ITIMES: mtime/atime has been updated |
| 674 | */ |
| 675 | void |
| 676 | hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags) |
| 677 | { |
| 678 | KKASSERT ((ip->flags & HAMMER_INODE_RO) == 0 || |
| 679 | (flags & (HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY| |
| 680 | HAMMER_INODE_XDIRTY|HAMMER_INODE_BUFS| |
| 681 | HAMMER_INODE_DELETED|HAMMER_INODE_ITIMES)) == 0); |
| 682 | |
| 683 | ip->flags |= flags; |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * Request that an inode be flushed. This whole mess cannot block and may |
| 688 | * recurse. Once requested HAMMER will attempt to actively flush it until |
| 689 | * the flush can be done. |
| 690 | * |
| 691 | * The inode may already be flushing, or may be in a setup state. We can |
| 692 | * place the inode in a flushing state if it is currently idle and flag it |
| 693 | * to reflush if it is currently flushing. |
| 694 | */ |
| 695 | void |
| 696 | hammer_flush_inode(hammer_inode_t ip, int flags) |
| 697 | { |
| 698 | hammer_record_t depend; |
| 699 | int r, good; |
| 700 | |
| 701 | /* |
| 702 | * Trivial 'nothing to flush' case. If the inode is ina SETUP |
| 703 | * state we have to put it back into an IDLE state so we can |
| 704 | * drop the extra ref. |
| 705 | */ |
| 706 | if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { |
| 707 | if (ip->flush_state == HAMMER_FST_SETUP) { |
| 708 | ip->flush_state = HAMMER_FST_IDLE; |
| 709 | hammer_rel_inode(ip, 0); |
| 710 | } |
| 711 | return; |
| 712 | } |
| 713 | |
| 714 | /* |
| 715 | * Our flush action will depend on the current state. |
| 716 | */ |
| 717 | switch(ip->flush_state) { |
| 718 | case HAMMER_FST_IDLE: |
| 719 | /* |
| 720 | * We have no dependancies and can flush immediately. Some |
| 721 | * our children may not be flushable so we have to re-test |
| 722 | * with that additional knowledge. |
| 723 | */ |
| 724 | hammer_flush_inode_core(ip, flags); |
| 725 | break; |
| 726 | case HAMMER_FST_SETUP: |
| 727 | /* |
| 728 | * Recurse upwards through dependancies via target_list |
| 729 | * and start their flusher actions going if possible. |
| 730 | * |
| 731 | * 'good' is our connectivity. -1 means we have none and |
| 732 | * can't flush, 0 means there weren't any dependancies, and |
| 733 | * 1 means we have good connectivity. |
| 734 | */ |
| 735 | good = 0; |
| 736 | TAILQ_FOREACH(depend, &ip->target_list, target_entry) { |
| 737 | r = hammer_setup_parent_inodes(depend); |
| 738 | if (r < 0 && good == 0) |
| 739 | good = -1; |
| 740 | if (r > 0) |
| 741 | good = 1; |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * We can continue if good >= 0. Determine how many records |
| 746 | * under our inode can be flushed (and mark them). |
| 747 | */ |
| 748 | if (good >= 0) { |
| 749 | hammer_flush_inode_core(ip, flags); |
| 750 | } else { |
| 751 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 752 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 753 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 754 | hammer_flusher_async(ip->hmp); |
| 755 | } |
| 756 | } |
| 757 | break; |
| 758 | default: |
| 759 | /* |
| 760 | * We are already flushing, flag the inode to reflush |
| 761 | * if needed after it completes its current flush. |
| 762 | */ |
| 763 | if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) |
| 764 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 765 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 766 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 767 | hammer_flusher_async(ip->hmp); |
| 768 | } |
| 769 | break; |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * We are asked to recurse upwards and convert the record from SETUP |
| 775 | * to FLUSH if possible. record->ip is a parent of the caller's inode, |
| 776 | * and record->target_ip is the caller's inode. |
| 777 | * |
| 778 | * Return 1 if the record gives us connectivity |
| 779 | * |
| 780 | * Return 0 if the record is not relevant |
| 781 | * |
| 782 | * Return -1 if we can't resolve the dependancy and there is no connectivity. |
| 783 | */ |
| 784 | static int |
| 785 | hammer_setup_parent_inodes(hammer_record_t record) |
| 786 | { |
| 787 | hammer_mount_t hmp = record->ip->hmp; |
| 788 | hammer_record_t depend; |
| 789 | hammer_inode_t ip; |
| 790 | int r, good; |
| 791 | |
| 792 | KKASSERT(record->flush_state != HAMMER_FST_IDLE); |
| 793 | ip = record->ip; |
| 794 | |
| 795 | /* |
| 796 | * If the record is already flushing, is it in our flush group? |
| 797 | * |
| 798 | * If it is in our flush group but it is a delete-on-disk, it |
| 799 | * does not improve our connectivity (return 0), and if the |
| 800 | * target inode is not trying to destroy itself we can't allow |
| 801 | * the operation yet anyway (the second return -1). |
| 802 | */ |
| 803 | if (record->flush_state == HAMMER_FST_FLUSH) { |
| 804 | if (record->flush_group != hmp->flusher_next) { |
| 805 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 806 | return(-1); |
| 807 | } |
| 808 | if (record->type == HAMMER_MEM_RECORD_ADD) |
| 809 | return(1); |
| 810 | return(0); |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * It must be a setup record. Try to resolve the setup dependancies |
| 815 | * by recursing upwards so we can place ip on the flush list. |
| 816 | */ |
| 817 | KKASSERT(record->flush_state == HAMMER_FST_SETUP); |
| 818 | |
| 819 | good = 0; |
| 820 | TAILQ_FOREACH(depend, &ip->target_list, target_entry) { |
| 821 | r = hammer_setup_parent_inodes(depend); |
| 822 | if (r < 0 && good == 0) |
| 823 | good = -1; |
| 824 | if (r > 0) |
| 825 | good = 1; |
| 826 | } |
| 827 | |
| 828 | /* |
| 829 | * We can't flush ip because it has no connectivity (XXX also check |
| 830 | * nlinks for pre-existing connectivity!). Flag it so any resolution |
| 831 | * recurses back down. |
| 832 | */ |
| 833 | if (good < 0) { |
| 834 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 835 | return(good); |
| 836 | } |
| 837 | |
| 838 | /* |
| 839 | * We are go, place the parent inode in a flushing state so we can |
| 840 | * place its record in a flushing state. Note that the parent |
| 841 | * may already be flushing. The record must be in the same flush |
| 842 | * group as the parent. |
| 843 | */ |
| 844 | if (ip->flush_state != HAMMER_FST_FLUSH) |
| 845 | hammer_flush_inode_core(ip, HAMMER_FLUSH_RECURSION); |
| 846 | KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); |
| 847 | KKASSERT(record->flush_state == HAMMER_FST_SETUP); |
| 848 | |
| 849 | #if 0 |
| 850 | if (record->type == HAMMER_MEM_RECORD_DEL && |
| 851 | (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { |
| 852 | /* |
| 853 | * Regardless of flushing state we cannot sync this path if the |
| 854 | * record represents a delete-on-disk but the target inode |
| 855 | * is not ready to sync its own deletion. |
| 856 | * |
| 857 | * XXX need to count effective nlinks to determine whether |
| 858 | * the flush is ok, otherwise removing a hardlink will |
| 859 | * just leave the DEL record to rot. |
| 860 | */ |
| 861 | record->target_ip->flags |= HAMMER_INODE_REFLUSH; |
| 862 | return(-1); |
| 863 | } else |
| 864 | #endif |
| 865 | if (ip->flush_group == ip->hmp->flusher_next) { |
| 866 | /* |
| 867 | * This is the record we wanted to synchronize. |
| 868 | */ |
| 869 | record->flush_state = HAMMER_FST_FLUSH; |
| 870 | record->flush_group = ip->flush_group; |
| 871 | hammer_ref(&record->lock); |
| 872 | if (record->type == HAMMER_MEM_RECORD_ADD) |
| 873 | return(1); |
| 874 | |
| 875 | /* |
| 876 | * The record is a delete-n-disk. It does not contribute |
| 877 | * to our visibility. We can still flush it. |
| 878 | */ |
| 879 | return(0); |
| 880 | } else { |
| 881 | /* |
| 882 | * We couldn't resolve the dependancies, request that the |
| 883 | * inode be flushed when the dependancies can be resolved. |
| 884 | */ |
| 885 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 886 | return(-1); |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | /* |
| 891 | * This is the core routine placing an inode into the FST_FLUSH state. |
| 892 | */ |
| 893 | static void |
| 894 | hammer_flush_inode_core(hammer_inode_t ip, int flags) |
| 895 | { |
| 896 | int go_count; |
| 897 | |
| 898 | /* |
| 899 | * Set flush state and prevent the flusher from cycling into |
| 900 | * the next flush group. Do not place the ip on the list yet. |
| 901 | * Inodes not in the idle state get an extra reference. |
| 902 | */ |
| 903 | KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); |
| 904 | if (ip->flush_state == HAMMER_FST_IDLE) |
| 905 | hammer_ref(&ip->lock); |
| 906 | ip->flush_state = HAMMER_FST_FLUSH; |
| 907 | ip->flush_group = ip->hmp->flusher_next; |
| 908 | ++ip->hmp->flusher_lock; |
| 909 | |
| 910 | /* |
| 911 | * Figure out how many in-memory records we can actually flush |
| 912 | * (not including inode meta-data, buffers, etc). |
| 913 | */ |
| 914 | if (flags & HAMMER_FLUSH_RECURSION) { |
| 915 | go_count = 1; |
| 916 | } else { |
| 917 | go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, |
| 918 | hammer_setup_child_callback, NULL); |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * This is a more involved test that includes go_count. If we |
| 923 | * can't flush, flag the inode and return. If go_count is 0 we |
| 924 | * were are unable to flush any records in our rec_tree and |
| 925 | * must ignore the XDIRTY flag. |
| 926 | */ |
| 927 | if (go_count == 0) { |
| 928 | if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { |
| 929 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 930 | ip->flush_state = HAMMER_FST_SETUP; |
| 931 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 932 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 933 | hammer_flusher_async(ip->hmp); |
| 934 | } |
| 935 | if (--ip->hmp->flusher_lock == 0) |
| 936 | wakeup(&ip->hmp->flusher_lock); |
| 937 | return; |
| 938 | } |
| 939 | } |
| 940 | |
| 941 | #if 0 |
| 942 | /* |
| 943 | * XXX - don't sync the buffer cache on the frontend, the backend |
| 944 | * will do it and we do not want to prematurely activate the backend. |
| 945 | * |
| 946 | * Sync the buffer cache if the caller wants to flush now, otherwise |
| 947 | * don't (any write bios will wake up the flusher). |
| 948 | */ |
| 949 | if ((flags & HAMMER_FLUSH_RECURSION) == 0 && |
| 950 | (flags & HAMMER_FLUSH_SIGNAL)) { |
| 951 | if (ip->vp != NULL) |
| 952 | error = vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL); |
| 953 | else |
| 954 | error = 0; |
| 955 | } |
| 956 | |
| 957 | /* |
| 958 | * Any further strategy calls will go into the inode's alternative |
| 959 | * bioq. |
| 960 | */ |
| 961 | ip->flags |= HAMMER_INODE_WRITE_ALT; |
| 962 | #endif |
| 963 | |
| 964 | /* |
| 965 | * Snapshot the state of the inode for the backend flusher. |
| 966 | * |
| 967 | * The truncation must be retained in the frontend until after |
| 968 | * we've actually performed the record deletion. |
| 969 | * |
| 970 | * NOTE: The DELETING flag is a mod flag, but it is also sticky, |
| 971 | * and stays in ip->flags. Once set, it stays set until the |
| 972 | * inode is destroyed. |
| 973 | */ |
| 974 | ip->sync_flags = (ip->flags & HAMMER_INODE_MODMASK); |
| 975 | ip->sync_trunc_off = ip->trunc_off; |
| 976 | ip->sync_ino_rec = ip->ino_rec; |
| 977 | ip->sync_ino_data = ip->ino_data; |
| 978 | ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; |
| 979 | |
| 980 | /* |
| 981 | * The flusher list inherits our inode and reference. |
| 982 | */ |
| 983 | TAILQ_INSERT_TAIL(&ip->hmp->flush_list, ip, flush_entry); |
| 984 | if (--ip->hmp->flusher_lock == 0) |
| 985 | wakeup(&ip->hmp->flusher_lock); |
| 986 | |
| 987 | if (flags & HAMMER_FLUSH_SIGNAL) |
| 988 | hammer_flusher_async(ip->hmp); |
| 989 | } |
| 990 | |
| 991 | /* |
| 992 | * Callback for scan of ip->rec_tree. Try to include each record in our |
| 993 | * flush. ip->flush_group has been set but the inode has not yet been |
| 994 | * moved into a flushing state. |
| 995 | * |
| 996 | * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on |
| 997 | * both inodes. |
| 998 | * |
| 999 | * We return 1 for any record placed or found in FST_FLUSH, which prevents |
| 1000 | * the caller from shortcutting the flush. |
| 1001 | */ |
| 1002 | static int |
| 1003 | hammer_setup_child_callback(hammer_record_t rec, void *data) |
| 1004 | { |
| 1005 | hammer_inode_t target_ip; |
| 1006 | hammer_inode_t ip; |
| 1007 | int r; |
| 1008 | |
| 1009 | /* |
| 1010 | * If the record has been deleted by the backend (it's being held |
| 1011 | * by the frontend in a race), just ignore it. |
| 1012 | */ |
| 1013 | if (rec->flags & HAMMER_RECF_DELETED_BE) |
| 1014 | return(0); |
| 1015 | |
| 1016 | /* |
| 1017 | * If the record is in an idle state it has no dependancies and |
| 1018 | * can be flushed. |
| 1019 | */ |
| 1020 | ip = rec->ip; |
| 1021 | r = 0; |
| 1022 | |
| 1023 | switch(rec->flush_state) { |
| 1024 | case HAMMER_FST_IDLE: |
| 1025 | /* |
| 1026 | * Record has no setup dependancy, we can flush it. |
| 1027 | */ |
| 1028 | KKASSERT(rec->target_ip == NULL); |
| 1029 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1030 | rec->flush_group = ip->flush_group; |
| 1031 | hammer_ref(&rec->lock); |
| 1032 | r = 1; |
| 1033 | break; |
| 1034 | case HAMMER_FST_SETUP: |
| 1035 | /* |
| 1036 | * Record has a setup dependancy. Try to include the |
| 1037 | * target ip in the flush. |
| 1038 | * |
| 1039 | * We have to be careful here, if we do not do the right |
| 1040 | * thing we can lose track of dirty inodes and the system |
| 1041 | * will lockup trying to allocate buffers. |
| 1042 | */ |
| 1043 | target_ip = rec->target_ip; |
| 1044 | KKASSERT(target_ip != NULL); |
| 1045 | KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); |
| 1046 | if (target_ip->flush_state == HAMMER_FST_FLUSH) { |
| 1047 | /* |
| 1048 | * If the target IP is already flushing in our group |
| 1049 | * we are golden, otherwise make sure the target |
| 1050 | * reflushes. |
| 1051 | */ |
| 1052 | if (target_ip->flush_group == ip->flush_group) { |
| 1053 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1054 | rec->flush_group = ip->flush_group; |
| 1055 | hammer_ref(&rec->lock); |
| 1056 | r = 1; |
| 1057 | } else { |
| 1058 | target_ip->flags |= HAMMER_INODE_REFLUSH; |
| 1059 | } |
| 1060 | } else if (rec->type == HAMMER_MEM_RECORD_ADD) { |
| 1061 | /* |
| 1062 | * If the target IP is not flushing we can force |
| 1063 | * it to flush, even if it is unable to write out |
| 1064 | * any of its own records we have at least one in |
| 1065 | * hand that we CAN deal with. |
| 1066 | */ |
| 1067 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1068 | rec->flush_group = ip->flush_group; |
| 1069 | hammer_ref(&rec->lock); |
| 1070 | hammer_flush_inode_core(target_ip, |
| 1071 | HAMMER_FLUSH_RECURSION); |
| 1072 | r = 1; |
| 1073 | } else { |
| 1074 | /* |
| 1075 | * XXX this needs help. We have a delete-on-disk |
| 1076 | * which could disconnect the target. If the target |
| 1077 | * has its own dependancies they really need to |
| 1078 | * be flushed. |
| 1079 | * |
| 1080 | * XXX |
| 1081 | */ |
| 1082 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1083 | rec->flush_group = ip->flush_group; |
| 1084 | hammer_ref(&rec->lock); |
| 1085 | hammer_flush_inode_core(target_ip, |
| 1086 | HAMMER_FLUSH_RECURSION); |
| 1087 | r = 1; |
| 1088 | } |
| 1089 | break; |
| 1090 | case HAMMER_FST_FLUSH: |
| 1091 | /* |
| 1092 | * Record already associated with a flush group. It had |
| 1093 | * better be ours. |
| 1094 | */ |
| 1095 | KKASSERT(rec->flush_group == ip->flush_group); |
| 1096 | r = 1; |
| 1097 | break; |
| 1098 | } |
| 1099 | return(r); |
| 1100 | } |
| 1101 | |
| 1102 | /* |
| 1103 | * Wait for a previously queued flush to complete |
| 1104 | */ |
| 1105 | void |
| 1106 | hammer_wait_inode(hammer_inode_t ip) |
| 1107 | { |
| 1108 | while (ip->flush_state == HAMMER_FST_FLUSH) { |
| 1109 | ip->flags |= HAMMER_INODE_FLUSHW; |
| 1110 | tsleep(&ip->flags, 0, "hmrwin", 0); |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | /* |
| 1115 | * Called by the backend code when a flush has been completed. |
| 1116 | * The inode has already been removed from the flush list. |
| 1117 | * |
| 1118 | * A pipelined flush can occur, in which case we must re-enter the |
| 1119 | * inode on the list and re-copy its fields. |
| 1120 | */ |
| 1121 | void |
| 1122 | hammer_flush_inode_done(hammer_inode_t ip) |
| 1123 | { |
| 1124 | struct bio *bio; |
| 1125 | int dorel = 0; |
| 1126 | |
| 1127 | KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); |
| 1128 | |
| 1129 | /* |
| 1130 | * Allow BIOs to queue to the inode's primary bioq again. |
| 1131 | */ |
| 1132 | ip->flags &= ~HAMMER_INODE_WRITE_ALT; |
| 1133 | |
| 1134 | /* |
| 1135 | * Merge left-over flags back into the frontend and fix the state. |
| 1136 | */ |
| 1137 | ip->flags |= ip->sync_flags; |
| 1138 | |
| 1139 | /* |
| 1140 | * The backend may have adjusted nlinks, so if the adjusted nlinks |
| 1141 | * does not match the fronttend set the frontend's RDIRTY flag again. |
| 1142 | */ |
| 1143 | if (ip->ino_rec.ino_nlinks != ip->sync_ino_rec.ino_nlinks) |
| 1144 | ip->flags |= HAMMER_INODE_RDIRTY; |
| 1145 | |
| 1146 | /* |
| 1147 | * Reflush any BIOs that wound up in the alt list. Our inode will |
| 1148 | * also wind up at the end of the flusher's list. |
| 1149 | */ |
| 1150 | while ((bio = TAILQ_FIRST(&ip->bio_alt_list)) != NULL) { |
| 1151 | TAILQ_REMOVE(&ip->bio_alt_list, bio, bio_act); |
| 1152 | TAILQ_INSERT_TAIL(&ip->bio_list, bio, bio_act); |
| 1153 | } |
| 1154 | /* |
| 1155 | * Fix up the dirty buffer status. |
| 1156 | */ |
| 1157 | if (TAILQ_FIRST(&ip->bio_list) || |
| 1158 | (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree))) { |
| 1159 | ip->flags |= HAMMER_INODE_BUFS; |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * Re-set the XDIRTY flag if some of the inode's in-memory records |
| 1164 | * could not be flushed. |
| 1165 | */ |
| 1166 | if (RB_ROOT(&ip->rec_tree)) |
| 1167 | ip->flags |= HAMMER_INODE_XDIRTY; |
| 1168 | |
| 1169 | /* |
| 1170 | * Do not lose track of inodes which no longer have vnode |
| 1171 | * assocations, otherwise they may never get flushed again. |
| 1172 | */ |
| 1173 | if ((ip->flags & HAMMER_INODE_MODMASK) && ip->vp == NULL) |
| 1174 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 1175 | |
| 1176 | /* |
| 1177 | * Adjust flush_state. The target state (idle or setup) shouldn't |
| 1178 | * be terribly important since we will reflush if we really need |
| 1179 | * to do anything. XXX |
| 1180 | */ |
| 1181 | if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { |
| 1182 | ip->flush_state = HAMMER_FST_IDLE; |
| 1183 | dorel = 1; |
| 1184 | } else { |
| 1185 | ip->flush_state = HAMMER_FST_SETUP; |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * If the frontend made more changes and requested another flush, |
| 1190 | * then try to get it running. |
| 1191 | */ |
| 1192 | if (ip->flags & HAMMER_INODE_REFLUSH) { |
| 1193 | ip->flags &= ~HAMMER_INODE_REFLUSH; |
| 1194 | if (ip->flags & HAMMER_INODE_RESIGNAL) { |
| 1195 | ip->flags &= ~HAMMER_INODE_RESIGNAL; |
| 1196 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1197 | } else { |
| 1198 | hammer_flush_inode(ip, 0); |
| 1199 | } |
| 1200 | } |
| 1201 | |
| 1202 | /* |
| 1203 | * Finally, if the frontend is waiting for a flush to complete, |
| 1204 | * wake it up. |
| 1205 | */ |
| 1206 | if (ip->flush_state != HAMMER_FST_FLUSH) { |
| 1207 | if (ip->flags & HAMMER_INODE_FLUSHW) { |
| 1208 | ip->flags &= ~HAMMER_INODE_FLUSHW; |
| 1209 | wakeup(&ip->flags); |
| 1210 | } |
| 1211 | } |
| 1212 | if (dorel) |
| 1213 | hammer_rel_inode(ip, 0); |
| 1214 | } |
| 1215 | |
| 1216 | /* |
| 1217 | * Called from hammer_sync_inode() to synchronize in-memory records |
| 1218 | * to the media. |
| 1219 | */ |
| 1220 | static int |
| 1221 | hammer_sync_record_callback(hammer_record_t record, void *data) |
| 1222 | { |
| 1223 | hammer_cursor_t cursor = data; |
| 1224 | hammer_transaction_t trans = cursor->trans; |
| 1225 | int error; |
| 1226 | |
| 1227 | /* |
| 1228 | * Skip records that do not belong to the current flush. |
| 1229 | */ |
| 1230 | if (record->flush_state != HAMMER_FST_FLUSH) |
| 1231 | return(0); |
| 1232 | KKASSERT((record->flags & HAMMER_RECF_DELETED_BE) == 0); |
| 1233 | #if 1 |
| 1234 | if (record->flush_group != record->ip->flush_group) { |
| 1235 | kprintf("sync_record %p ip %p bad flush group %d %d\n", record, record->ip, record->flush_group ,record->ip->flush_group); |
| 1236 | Debugger("blah2"); |
| 1237 | return(0); |
| 1238 | } |
| 1239 | #endif |
| 1240 | KKASSERT(record->flush_group == record->ip->flush_group); |
| 1241 | |
| 1242 | /* |
| 1243 | * Interlock the record using the BE flag. Once BE is set the |
| 1244 | * frontend cannot change the state of FE. |
| 1245 | * |
| 1246 | * NOTE: If FE is set prior to us setting BE we still sync the |
| 1247 | * record out, but the flush completion code converts it to |
| 1248 | * a delete-on-disk record instead of destroying it. |
| 1249 | */ |
| 1250 | KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); |
| 1251 | record->flags |= HAMMER_RECF_INTERLOCK_BE; |
| 1252 | |
| 1253 | /* |
| 1254 | * If DELETED_FE is set we may have already sent dependant pieces |
| 1255 | * to the disk and we must flush the record as if it hadn't been |
| 1256 | * deleted. This creates a bit of a mess because we have to |
| 1257 | * have ip_sync_record convert the record to MEM_RECORD_DEL before |
| 1258 | * it inserts the B-Tree record. Otherwise the media sync might |
| 1259 | * be visible to the frontend. |
| 1260 | */ |
| 1261 | if (record->flags & HAMMER_RECF_DELETED_FE) { |
| 1262 | KKASSERT(record->type == HAMMER_MEM_RECORD_ADD); |
| 1263 | record->flags |= HAMMER_RECF_CONVERT_DELETE; |
| 1264 | } |
| 1265 | |
| 1266 | /* |
| 1267 | * Assign the create_tid for new records. Deletions already |
| 1268 | * have the record's entire key properly set up. |
| 1269 | */ |
| 1270 | if (record->type != HAMMER_MEM_RECORD_DEL) |
| 1271 | record->rec.inode.base.base.create_tid = trans->tid; |
| 1272 | for (;;) { |
| 1273 | error = hammer_ip_sync_record_cursor(cursor, record); |
| 1274 | if (error != EDEADLK) |
| 1275 | break; |
| 1276 | hammer_done_cursor(cursor); |
| 1277 | error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], |
| 1278 | record->ip); |
| 1279 | if (error) |
| 1280 | break; |
| 1281 | } |
| 1282 | record->flags &= ~HAMMER_RECF_CONVERT_DELETE; |
| 1283 | |
| 1284 | if (error) { |
| 1285 | error = -error; |
| 1286 | if (error != -ENOSPC) { |
| 1287 | kprintf("hammer_sync_record_callback: sync failed rec " |
| 1288 | "%p, error %d\n", record, error); |
| 1289 | Debugger("sync failed rec"); |
| 1290 | } |
| 1291 | } |
| 1292 | hammer_flush_record_done(record, error); |
| 1293 | return(error); |
| 1294 | } |
| 1295 | |
| 1296 | /* |
| 1297 | * XXX error handling |
| 1298 | */ |
| 1299 | int |
| 1300 | hammer_sync_inode(hammer_inode_t ip) |
| 1301 | { |
| 1302 | struct hammer_transaction trans; |
| 1303 | struct hammer_cursor cursor; |
| 1304 | struct bio *bio; |
| 1305 | hammer_record_t depend; |
| 1306 | hammer_record_t next; |
| 1307 | int error, tmp_error; |
| 1308 | u_int64_t nlinks; |
| 1309 | |
| 1310 | if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) |
| 1311 | return(0); |
| 1312 | |
| 1313 | hammer_start_transaction_fls(&trans, ip->hmp); |
| 1314 | error = hammer_init_cursor(&trans, &cursor, &ip->cache[0], ip); |
| 1315 | if (error) |
| 1316 | goto done; |
| 1317 | |
| 1318 | /* |
| 1319 | * Any directory records referencing this inode which are not in |
| 1320 | * our current flush group must adjust our nlink count for the |
| 1321 | * purposes of synchronization to disk. |
| 1322 | * |
| 1323 | * Records which are in our flush group can be unlinked from our |
| 1324 | * inode now, allowing the inode to be physically deleted. |
| 1325 | */ |
| 1326 | nlinks = ip->ino_rec.ino_nlinks; |
| 1327 | next = TAILQ_FIRST(&ip->target_list); |
| 1328 | while ((depend = next) != NULL) { |
| 1329 | next = TAILQ_NEXT(depend, target_entry); |
| 1330 | if (depend->flush_state == HAMMER_FST_FLUSH && |
| 1331 | depend->flush_group == ip->hmp->flusher_act) { |
| 1332 | TAILQ_REMOVE(&ip->target_list, depend, target_entry); |
| 1333 | depend->target_ip = NULL; |
| 1334 | /* no need to signal target_ip, it is us */ |
| 1335 | } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { |
| 1336 | switch(depend->type) { |
| 1337 | case HAMMER_MEM_RECORD_ADD: |
| 1338 | --nlinks; |
| 1339 | break; |
| 1340 | case HAMMER_MEM_RECORD_DEL: |
| 1341 | ++nlinks; |
| 1342 | break; |
| 1343 | } |
| 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | /* |
| 1348 | * Set dirty if we had to modify the link count. |
| 1349 | */ |
| 1350 | if (ip->sync_ino_rec.ino_nlinks != nlinks) { |
| 1351 | KKASSERT((int64_t)nlinks >= 0); |
| 1352 | ip->sync_ino_rec.ino_nlinks = nlinks; |
| 1353 | ip->sync_flags |= HAMMER_INODE_RDIRTY; |
| 1354 | } |
| 1355 | |
| 1356 | /* |
| 1357 | * Queue up any pending dirty buffers then set a flag to cause |
| 1358 | * any further BIOs to go to the alternative queue. |
| 1359 | */ |
| 1360 | if (ip->vp) |
| 1361 | error = vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL); |
| 1362 | ip->flags |= HAMMER_INODE_WRITE_ALT; |
| 1363 | |
| 1364 | /* |
| 1365 | * The buffer cache may contain dirty buffers beyond the inode |
| 1366 | * state we copied from the frontend to the backend. Because |
| 1367 | * we are syncing our buffer cache on the backend, resync |
| 1368 | * the truncation point and the file size so we don't wipe out |
| 1369 | * any data. |
| 1370 | * |
| 1371 | * Syncing the buffer cache on the frontend has serious problems |
| 1372 | * because it prevents us from passively queueing dirty inodes |
| 1373 | * to the backend (the BIO's could stall indefinitely). |
| 1374 | */ |
| 1375 | if (ip->flags & HAMMER_INODE_TRUNCATED) { |
| 1376 | ip->sync_trunc_off = ip->trunc_off; |
| 1377 | ip->sync_flags |= HAMMER_INODE_TRUNCATED; |
| 1378 | } |
| 1379 | if (ip->sync_ino_rec.ino_size != ip->ino_rec.ino_size) { |
| 1380 | ip->sync_ino_rec.ino_size = ip->ino_rec.ino_size; |
| 1381 | ip->sync_flags |= HAMMER_INODE_RDIRTY; |
| 1382 | } |
| 1383 | |
| 1384 | /* |
| 1385 | * If there is a trunction queued destroy any data past the (aligned) |
| 1386 | * truncation point. Userland will have dealt with the buffer |
| 1387 | * containing the truncation point for us. |
| 1388 | * |
| 1389 | * We don't flush pending frontend data buffers until after we've |
| 1390 | * dealth with the truncation. |
| 1391 | * |
| 1392 | * Don't bother if the inode is or has been deleted. |
| 1393 | */ |
| 1394 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 1395 | /* |
| 1396 | * Interlock trunc_off. The VOP front-end may continue to |
| 1397 | * make adjustments to it while we are blocked. |
| 1398 | */ |
| 1399 | off_t trunc_off; |
| 1400 | off_t aligned_trunc_off; |
| 1401 | |
| 1402 | trunc_off = ip->sync_trunc_off; |
| 1403 | aligned_trunc_off = (trunc_off + HAMMER_BUFMASK) & |
| 1404 | ~HAMMER_BUFMASK64; |
| 1405 | |
| 1406 | /* |
| 1407 | * Delete any whole blocks on-media. The front-end has |
| 1408 | * already cleaned out any partial block and made it |
| 1409 | * pending. The front-end may have updated trunc_off |
| 1410 | * while we were blocked so do not just unconditionally |
| 1411 | * set it to the maximum offset. |
| 1412 | */ |
| 1413 | error = hammer_ip_delete_range(&cursor, ip, |
| 1414 | aligned_trunc_off, |
| 1415 | 0x7FFFFFFFFFFFFFFFLL); |
| 1416 | if (error) |
| 1417 | Debugger("hammer_ip_delete_range errored"); |
| 1418 | ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; |
| 1419 | if (ip->trunc_off >= trunc_off) { |
| 1420 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 1421 | ip->flags &= ~HAMMER_INODE_TRUNCATED; |
| 1422 | } |
| 1423 | } else { |
| 1424 | error = 0; |
| 1425 | } |
| 1426 | |
| 1427 | /* |
| 1428 | * Now sync related records. These will typically be directory |
| 1429 | * entries or delete-on-disk records. |
| 1430 | * |
| 1431 | * Not all records will be flushed, but clear XDIRTY anyway. We |
| 1432 | * will set it again in the frontend hammer_flush_inode_done() |
| 1433 | * if records remain. |
| 1434 | */ |
| 1435 | if (error == 0) { |
| 1436 | tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, |
| 1437 | hammer_sync_record_callback, &cursor); |
| 1438 | if (tmp_error < 0) |
| 1439 | tmp_error = -error; |
| 1440 | if (tmp_error) |
| 1441 | error = tmp_error; |
| 1442 | if (error == 0) |
| 1443 | ip->sync_flags &= ~HAMMER_INODE_XDIRTY; |
| 1444 | } |
| 1445 | |
| 1446 | /* |
| 1447 | * If we are deleting the inode the frontend had better not have |
| 1448 | * any active references on elements making up the inode. |
| 1449 | */ |
| 1450 | if (error == 0 && ip->sync_ino_rec.ino_nlinks == 0 && |
| 1451 | RB_EMPTY(&ip->rec_tree) && |
| 1452 | (ip->sync_flags & HAMMER_INODE_DELETING) && |
| 1453 | (ip->flags & HAMMER_INODE_DELETED) == 0) { |
| 1454 | int count1 = 0; |
| 1455 | |
| 1456 | kprintf("Y"); |
| 1457 | ip->flags |= HAMMER_INODE_DELETED; |
| 1458 | error = hammer_ip_delete_range_all(&cursor, ip, &count1); |
| 1459 | if (error == 0) { |
| 1460 | ip->sync_flags &= ~HAMMER_INODE_DELETING; |
| 1461 | ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; |
| 1462 | KKASSERT(RB_EMPTY(&ip->rec_tree)); |
| 1463 | |
| 1464 | /* |
| 1465 | * Set delete_tid in both the frontend and backend |
| 1466 | * copy of the inode record. The DELETED flag handles |
| 1467 | * this, do not set RDIRTY. |
| 1468 | */ |
| 1469 | ip->ino_rec.base.base.delete_tid = trans.tid; |
| 1470 | ip->sync_ino_rec.base.base.delete_tid = trans.tid; |
| 1471 | |
| 1472 | /* |
| 1473 | * Adjust the inode count in the volume header |
| 1474 | */ |
| 1475 | hammer_modify_volume(&trans, trans.rootvol, NULL, 0); |
| 1476 | --ip->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 1477 | hammer_modify_volume_done(trans.rootvol); |
| 1478 | } else { |
| 1479 | ip->flags &= ~HAMMER_INODE_DELETED; |
| 1480 | Debugger("hammer_ip_delete_range_all errored"); |
| 1481 | } |
| 1482 | } |
| 1483 | |
| 1484 | /* |
| 1485 | * Flush any queued BIOs. These will just biodone() the IO's if |
| 1486 | * the inode has been deleted. |
| 1487 | */ |
| 1488 | while ((bio = TAILQ_FIRST(&ip->bio_list)) != NULL) { |
| 1489 | TAILQ_REMOVE(&ip->bio_list, bio, bio_act); |
| 1490 | tmp_error = hammer_dowrite(&cursor, ip, bio); |
| 1491 | if (tmp_error) |
| 1492 | error = tmp_error; |
| 1493 | } |
| 1494 | ip->sync_flags &= ~HAMMER_INODE_BUFS; |
| 1495 | |
| 1496 | if (error) |
| 1497 | Debugger("RB_SCAN errored"); |
| 1498 | |
| 1499 | /* |
| 1500 | * Now update the inode's on-disk inode-data and/or on-disk record. |
| 1501 | * DELETED and ONDISK are managed only in ip->flags. |
| 1502 | */ |
| 1503 | switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { |
| 1504 | case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: |
| 1505 | /* |
| 1506 | * If deleted and on-disk, don't set any additional flags. |
| 1507 | * the delete flag takes care of things. |
| 1508 | * |
| 1509 | * Clear flags which may have been set by the frontend. |
| 1510 | */ |
| 1511 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY| |
| 1512 | HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES| |
| 1513 | HAMMER_INODE_DELETING); |
| 1514 | break; |
| 1515 | case HAMMER_INODE_DELETED: |
| 1516 | /* |
| 1517 | * Take care of the case where a deleted inode was never |
| 1518 | * flushed to the disk in the first place. |
| 1519 | * |
| 1520 | * Clear flags which may have been set by the frontend. |
| 1521 | */ |
| 1522 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY| |
| 1523 | HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES| |
| 1524 | HAMMER_INODE_DELETING); |
| 1525 | while (RB_ROOT(&ip->rec_tree)) { |
| 1526 | hammer_record_t record = RB_ROOT(&ip->rec_tree); |
| 1527 | hammer_ref(&record->lock); |
| 1528 | KKASSERT(record->lock.refs == 1); |
| 1529 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 1530 | record->flags |= HAMMER_RECF_DELETED_BE; |
| 1531 | hammer_rel_mem_record(record); |
| 1532 | } |
| 1533 | break; |
| 1534 | case HAMMER_INODE_ONDISK: |
| 1535 | /* |
| 1536 | * If already on-disk, do not set any additional flags. |
| 1537 | */ |
| 1538 | break; |
| 1539 | default: |
| 1540 | /* |
| 1541 | * If not on-disk and not deleted, set both dirty flags |
| 1542 | * to force an initial record to be written. Also set |
| 1543 | * the create_tid for the inode. |
| 1544 | * |
| 1545 | * Set create_tid in both the frontend and backend |
| 1546 | * copy of the inode record. |
| 1547 | */ |
| 1548 | ip->ino_rec.base.base.create_tid = trans.tid; |
| 1549 | ip->sync_ino_rec.base.base.create_tid = trans.tid; |
| 1550 | ip->sync_flags |= HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY; |
| 1551 | break; |
| 1552 | } |
| 1553 | |
| 1554 | /* |
| 1555 | * If RDIRTY or DDIRTY is set, write out a new record. If the inode |
| 1556 | * is already on-disk the old record is marked as deleted. |
| 1557 | * |
| 1558 | * If DELETED is set hammer_update_inode() will delete the existing |
| 1559 | * record without writing out a new one. |
| 1560 | * |
| 1561 | * If *ONLY* the ITIMES flag is set we can update the record in-place. |
| 1562 | */ |
| 1563 | if (ip->flags & HAMMER_INODE_DELETED) { |
| 1564 | error = hammer_update_inode(&cursor, ip); |
| 1565 | } else |
| 1566 | if ((ip->sync_flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY | |
| 1567 | HAMMER_INODE_ITIMES)) == HAMMER_INODE_ITIMES) { |
| 1568 | error = hammer_update_itimes(&cursor, ip); |
| 1569 | } else |
| 1570 | if (ip->sync_flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY | |
| 1571 | HAMMER_INODE_ITIMES)) { |
| 1572 | error = hammer_update_inode(&cursor, ip); |
| 1573 | } |
| 1574 | if (error) |
| 1575 | Debugger("hammer_update_itimes/inode errored"); |
| 1576 | done: |
| 1577 | /* |
| 1578 | * Save the TID we used to sync the inode with to make sure we |
| 1579 | * do not improperly reuse it. |
| 1580 | */ |
| 1581 | hammer_done_cursor(&cursor); |
| 1582 | hammer_done_transaction(&trans); |
| 1583 | return(error); |
| 1584 | } |
| 1585 | |
| 1586 | /* |
| 1587 | * This routine is called when the OS is no longer actively referencing |
| 1588 | * the inode (but might still be keeping it cached), or when releasing |
| 1589 | * the last reference to an inode. |
| 1590 | * |
| 1591 | * At this point if the inode's nlinks count is zero we want to destroy |
| 1592 | * it, which may mean destroying it on-media too. |
| 1593 | */ |
| 1594 | static void |
| 1595 | hammer_inode_unloadable_check(hammer_inode_t ip) |
| 1596 | { |
| 1597 | /* |
| 1598 | * If the inode is on-media and the link count is 0 we MUST delete |
| 1599 | * it on-media. DELETING is a mod flag, DELETED is a state flag. |
| 1600 | */ |
| 1601 | if (ip->ino_rec.ino_nlinks == 0 && |
| 1602 | (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { |
| 1603 | if (ip->vp) { |
| 1604 | vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE); |
| 1605 | vnode_pager_setsize(ip->vp, 0); |
| 1606 | } |
| 1607 | ip->flags |= HAMMER_INODE_DELETING; |
| 1608 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 1609 | ip->trunc_off = 0; |
| 1610 | } |
| 1611 | } |
| 1612 | |
| 1613 | void |
| 1614 | hammer_test_inode(hammer_inode_t ip) |
| 1615 | { |
| 1616 | if (ip->flags & HAMMER_INODE_REFLUSH) { |
| 1617 | ip->flags &= ~HAMMER_INODE_REFLUSH; |
| 1618 | hammer_ref(&ip->lock); |
| 1619 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1620 | hammer_rel_inode(ip, 0); |
| 1621 | } |
| 1622 | } |
| 1623 | |