| 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 1.51 2008/05/04 19:57:42 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 int hammer_setup_parent_inodes(hammer_record_t record); |
| 46 | |
| 47 | /* |
| 48 | * The kernel is not actively referencing this vnode but is still holding |
| 49 | * it cached. |
| 50 | * |
| 51 | * This is called from the frontend. |
| 52 | */ |
| 53 | int |
| 54 | hammer_vop_inactive(struct vop_inactive_args *ap) |
| 55 | { |
| 56 | struct hammer_inode *ip = VTOI(ap->a_vp); |
| 57 | |
| 58 | /* |
| 59 | * Degenerate case |
| 60 | */ |
| 61 | if (ip == NULL) { |
| 62 | vrecycle(ap->a_vp); |
| 63 | return(0); |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * If the inode no longer has visibility in the filesystem and is |
| 68 | * fairly clean, try to recycle it immediately. This can deadlock |
| 69 | * in vfsync() if we aren't careful. |
| 70 | */ |
| 71 | hammer_inode_unloadable_check(ip, 0); |
| 72 | if (ip->flags & HAMMER_INODE_MODMASK) |
| 73 | hammer_flush_inode(ip, 0); |
| 74 | else if (ip->ino_rec.ino_nlinks == 0) |
| 75 | vrecycle(ap->a_vp); |
| 76 | return(0); |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Release the vnode association. This is typically (but not always) |
| 81 | * the last reference on the inode. |
| 82 | * |
| 83 | * Once the association is lost we are on our own with regards to |
| 84 | * flushing the inode. |
| 85 | */ |
| 86 | int |
| 87 | hammer_vop_reclaim(struct vop_reclaim_args *ap) |
| 88 | { |
| 89 | struct hammer_inode *ip; |
| 90 | struct vnode *vp; |
| 91 | |
| 92 | vp = ap->a_vp; |
| 93 | |
| 94 | if ((ip = vp->v_data) != NULL) { |
| 95 | vp->v_data = NULL; |
| 96 | ip->vp = NULL; |
| 97 | hammer_rel_inode(ip, 1); |
| 98 | } |
| 99 | return(0); |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Return a locked vnode for the specified inode. The inode must be |
| 104 | * referenced but NOT LOCKED on entry and will remain referenced on |
| 105 | * return. |
| 106 | * |
| 107 | * Called from the frontend. |
| 108 | */ |
| 109 | int |
| 110 | hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) |
| 111 | { |
| 112 | struct vnode *vp; |
| 113 | int error = 0; |
| 114 | |
| 115 | for (;;) { |
| 116 | if ((vp = ip->vp) == NULL) { |
| 117 | error = getnewvnode(VT_HAMMER, ip->hmp->mp, vpp, 0, 0); |
| 118 | if (error) |
| 119 | break; |
| 120 | hammer_lock_ex(&ip->lock); |
| 121 | if (ip->vp != NULL) { |
| 122 | hammer_unlock(&ip->lock); |
| 123 | vp->v_type = VBAD; |
| 124 | vx_put(vp); |
| 125 | continue; |
| 126 | } |
| 127 | hammer_ref(&ip->lock); |
| 128 | vp = *vpp; |
| 129 | ip->vp = vp; |
| 130 | vp->v_type = hammer_get_vnode_type( |
| 131 | ip->ino_rec.base.base.obj_type); |
| 132 | |
| 133 | switch(ip->ino_rec.base.base.obj_type) { |
| 134 | case HAMMER_OBJTYPE_CDEV: |
| 135 | case HAMMER_OBJTYPE_BDEV: |
| 136 | vp->v_ops = &ip->hmp->mp->mnt_vn_spec_ops; |
| 137 | addaliasu(vp, ip->ino_data.rmajor, |
| 138 | ip->ino_data.rminor); |
| 139 | break; |
| 140 | case HAMMER_OBJTYPE_FIFO: |
| 141 | vp->v_ops = &ip->hmp->mp->mnt_vn_fifo_ops; |
| 142 | break; |
| 143 | default: |
| 144 | break; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Only mark as the root vnode if the ip is not |
| 149 | * historical, otherwise the VFS cache will get |
| 150 | * confused. The other half of the special handling |
| 151 | * is in hammer_vop_nlookupdotdot(). |
| 152 | */ |
| 153 | if (ip->obj_id == HAMMER_OBJID_ROOT && |
| 154 | ip->obj_asof == ip->hmp->asof) { |
| 155 | vp->v_flag |= VROOT; |
| 156 | } |
| 157 | |
| 158 | vp->v_data = (void *)ip; |
| 159 | /* vnode locked by getnewvnode() */ |
| 160 | /* make related vnode dirty if inode dirty? */ |
| 161 | hammer_unlock(&ip->lock); |
| 162 | if (vp->v_type == VREG) |
| 163 | vinitvmio(vp, ip->ino_rec.ino_size); |
| 164 | break; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * loop if the vget fails (aka races), or if the vp |
| 169 | * no longer matches ip->vp. |
| 170 | */ |
| 171 | if (vget(vp, LK_EXCLUSIVE) == 0) { |
| 172 | if (vp == ip->vp) |
| 173 | break; |
| 174 | vput(vp); |
| 175 | } |
| 176 | } |
| 177 | *vpp = vp; |
| 178 | return(error); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Acquire a HAMMER inode. The returned inode is not locked. These functions |
| 183 | * do not attach or detach the related vnode (use hammer_get_vnode() for |
| 184 | * that). |
| 185 | * |
| 186 | * The flags argument is only applied for newly created inodes, and only |
| 187 | * certain flags are inherited. |
| 188 | * |
| 189 | * Called from the frontend. |
| 190 | */ |
| 191 | struct hammer_inode * |
| 192 | hammer_get_inode(hammer_transaction_t trans, struct hammer_node **cache, |
| 193 | u_int64_t obj_id, hammer_tid_t asof, int flags, int *errorp) |
| 194 | { |
| 195 | hammer_mount_t hmp = trans->hmp; |
| 196 | struct hammer_inode_info iinfo; |
| 197 | struct hammer_cursor cursor; |
| 198 | struct hammer_inode *ip; |
| 199 | |
| 200 | /* |
| 201 | * Determine if we already have an inode cached. If we do then |
| 202 | * we are golden. |
| 203 | */ |
| 204 | iinfo.obj_id = obj_id; |
| 205 | iinfo.obj_asof = asof; |
| 206 | loop: |
| 207 | ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); |
| 208 | if (ip) { |
| 209 | hammer_ref(&ip->lock); |
| 210 | *errorp = 0; |
| 211 | return(ip); |
| 212 | } |
| 213 | |
| 214 | ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO); |
| 215 | ++hammer_count_inodes; |
| 216 | ip->obj_id = obj_id; |
| 217 | ip->obj_asof = iinfo.obj_asof; |
| 218 | ip->hmp = hmp; |
| 219 | ip->flags = flags & HAMMER_INODE_RO; |
| 220 | if (hmp->ronly) |
| 221 | ip->flags |= HAMMER_INODE_RO; |
| 222 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 223 | RB_INIT(&ip->rec_tree); |
| 224 | TAILQ_INIT(&ip->bio_list); |
| 225 | TAILQ_INIT(&ip->bio_alt_list); |
| 226 | TAILQ_INIT(&ip->target_list); |
| 227 | |
| 228 | /* |
| 229 | * Locate the on-disk inode. |
| 230 | */ |
| 231 | retry: |
| 232 | hammer_init_cursor(trans, &cursor, cache, NULL); |
| 233 | cursor.key_beg.obj_id = ip->obj_id; |
| 234 | cursor.key_beg.key = 0; |
| 235 | cursor.key_beg.create_tid = 0; |
| 236 | cursor.key_beg.delete_tid = 0; |
| 237 | cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 238 | cursor.key_beg.obj_type = 0; |
| 239 | cursor.asof = iinfo.obj_asof; |
| 240 | cursor.flags = HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_GET_DATA | |
| 241 | HAMMER_CURSOR_ASOF; |
| 242 | |
| 243 | *errorp = hammer_btree_lookup(&cursor); |
| 244 | if (*errorp == EDEADLK) { |
| 245 | hammer_done_cursor(&cursor); |
| 246 | goto retry; |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * On success the B-Tree lookup will hold the appropriate |
| 251 | * buffer cache buffers and provide a pointer to the requested |
| 252 | * information. Copy the information to the in-memory inode |
| 253 | * and cache the B-Tree node to improve future operations. |
| 254 | */ |
| 255 | if (*errorp == 0) { |
| 256 | ip->ino_rec = cursor.record->inode; |
| 257 | ip->ino_data = cursor.data->inode; |
| 258 | hammer_cache_node(cursor.node, &ip->cache[0]); |
| 259 | if (cache) |
| 260 | hammer_cache_node(cursor.node, cache); |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * On success load the inode's record and data and insert the |
| 265 | * inode into the B-Tree. It is possible to race another lookup |
| 266 | * insertion of the same inode so deal with that condition too. |
| 267 | * |
| 268 | * The cursor's locked node interlocks against others creating and |
| 269 | * destroying ip while we were blocked. |
| 270 | */ |
| 271 | if (*errorp == 0) { |
| 272 | hammer_ref(&ip->lock); |
| 273 | if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { |
| 274 | hammer_uncache_node(&ip->cache[0]); |
| 275 | hammer_uncache_node(&ip->cache[1]); |
| 276 | KKASSERT(ip->lock.refs == 1); |
| 277 | --hammer_count_inodes; |
| 278 | kfree(ip, M_HAMMER); |
| 279 | hammer_done_cursor(&cursor); |
| 280 | goto loop; |
| 281 | } |
| 282 | ip->flags |= HAMMER_INODE_ONDISK; |
| 283 | } else { |
| 284 | kprintf("hammer_get_inode: failed ip %p obj_id %016llx cursor %p error %d\n", |
| 285 | ip, ip->obj_id, &cursor, *errorp); |
| 286 | /*Debugger("x");*/ |
| 287 | --hammer_count_inodes; |
| 288 | kfree(ip, M_HAMMER); |
| 289 | ip = NULL; |
| 290 | } |
| 291 | hammer_done_cursor(&cursor); |
| 292 | return (ip); |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Create a new filesystem object, returning the inode in *ipp. The |
| 297 | * returned inode will be referenced. |
| 298 | * |
| 299 | * The inode is created in-memory. |
| 300 | */ |
| 301 | int |
| 302 | hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, |
| 303 | struct ucred *cred, hammer_inode_t dip, |
| 304 | struct hammer_inode **ipp) |
| 305 | { |
| 306 | hammer_mount_t hmp; |
| 307 | hammer_inode_t ip; |
| 308 | uid_t xuid; |
| 309 | |
| 310 | hmp = trans->hmp; |
| 311 | ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO); |
| 312 | ++hammer_count_inodes; |
| 313 | ip->obj_id = hammer_alloc_objid(trans, dip); |
| 314 | KKASSERT(ip->obj_id != 0); |
| 315 | ip->obj_asof = hmp->asof; |
| 316 | ip->hmp = hmp; |
| 317 | ip->flush_state = HAMMER_FST_IDLE; |
| 318 | ip->flags = HAMMER_INODE_DDIRTY | HAMMER_INODE_RDIRTY | |
| 319 | HAMMER_INODE_ITIMES; |
| 320 | |
| 321 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 322 | RB_INIT(&ip->rec_tree); |
| 323 | TAILQ_INIT(&ip->bio_list); |
| 324 | TAILQ_INIT(&ip->bio_alt_list); |
| 325 | TAILQ_INIT(&ip->target_list); |
| 326 | |
| 327 | ip->ino_rec.ino_atime = trans->time; |
| 328 | ip->ino_rec.ino_mtime = trans->time; |
| 329 | ip->ino_rec.ino_size = 0; |
| 330 | ip->ino_rec.ino_nlinks = 0; |
| 331 | /* XXX */ |
| 332 | ip->ino_rec.base.base.btype = HAMMER_BTREE_TYPE_RECORD; |
| 333 | ip->ino_rec.base.base.obj_id = ip->obj_id; |
| 334 | ip->ino_rec.base.base.key = 0; |
| 335 | ip->ino_rec.base.base.create_tid = 0; |
| 336 | ip->ino_rec.base.base.delete_tid = 0; |
| 337 | ip->ino_rec.base.base.rec_type = HAMMER_RECTYPE_INODE; |
| 338 | ip->ino_rec.base.base.obj_type = hammer_get_obj_type(vap->va_type); |
| 339 | |
| 340 | ip->ino_data.version = HAMMER_INODE_DATA_VERSION; |
| 341 | ip->ino_data.mode = vap->va_mode; |
| 342 | ip->ino_data.ctime = trans->time; |
| 343 | ip->ino_data.parent_obj_id = (dip) ? dip->ino_rec.base.base.obj_id : 0; |
| 344 | |
| 345 | switch(ip->ino_rec.base.base.obj_type) { |
| 346 | case HAMMER_OBJTYPE_CDEV: |
| 347 | case HAMMER_OBJTYPE_BDEV: |
| 348 | ip->ino_data.rmajor = vap->va_rmajor; |
| 349 | ip->ino_data.rminor = vap->va_rminor; |
| 350 | break; |
| 351 | default: |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Calculate default uid/gid and overwrite with information from |
| 357 | * the vap. |
| 358 | */ |
| 359 | xuid = hammer_to_unix_xid(&dip->ino_data.uid); |
| 360 | ip->ino_data.gid = dip->ino_data.gid; |
| 361 | xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, xuid, cred, |
| 362 | &vap->va_mode); |
| 363 | ip->ino_data.mode = vap->va_mode; |
| 364 | |
| 365 | if (vap->va_vaflags & VA_UID_UUID_VALID) |
| 366 | ip->ino_data.uid = vap->va_uid_uuid; |
| 367 | else if (vap->va_uid != (uid_t)VNOVAL) |
| 368 | hammer_guid_to_uuid(&ip->ino_data.uid, xuid); |
| 369 | if (vap->va_vaflags & VA_GID_UUID_VALID) |
| 370 | ip->ino_data.gid = vap->va_gid_uuid; |
| 371 | else if (vap->va_gid != (gid_t)VNOVAL) |
| 372 | hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); |
| 373 | |
| 374 | hammer_ref(&ip->lock); |
| 375 | if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { |
| 376 | hammer_unref(&ip->lock); |
| 377 | panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id); |
| 378 | } |
| 379 | *ipp = ip; |
| 380 | return(0); |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Called by hammer_sync_inode(). |
| 385 | */ |
| 386 | static int |
| 387 | hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) |
| 388 | { |
| 389 | hammer_transaction_t trans = cursor->trans; |
| 390 | hammer_record_t record; |
| 391 | int error; |
| 392 | |
| 393 | retry: |
| 394 | error = 0; |
| 395 | |
| 396 | /* |
| 397 | * If the inode has a presence on-disk then locate it and mark |
| 398 | * it deleted, setting DELONDISK. |
| 399 | * |
| 400 | * The record may or may not be physically deleted, depending on |
| 401 | * the retention policy. |
| 402 | */ |
| 403 | if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == |
| 404 | HAMMER_INODE_ONDISK) { |
| 405 | hammer_normalize_cursor(cursor); |
| 406 | cursor->key_beg.obj_id = ip->obj_id; |
| 407 | cursor->key_beg.key = 0; |
| 408 | cursor->key_beg.create_tid = 0; |
| 409 | cursor->key_beg.delete_tid = 0; |
| 410 | cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 411 | cursor->key_beg.obj_type = 0; |
| 412 | cursor->asof = ip->obj_asof; |
| 413 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 414 | cursor->flags |= HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_ASOF; |
| 415 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 416 | |
| 417 | error = hammer_btree_lookup(cursor); |
| 418 | if (hammer_debug_inode) |
| 419 | kprintf("IPDEL %p %08x %d", ip, ip->flags, error); |
| 420 | if (error) { |
| 421 | kprintf("error %d\n", error); |
| 422 | Debugger("hammer_update_inode"); |
| 423 | } |
| 424 | |
| 425 | if (error == 0) { |
| 426 | error = hammer_ip_delete_record(cursor, trans->tid); |
| 427 | if (hammer_debug_inode) |
| 428 | kprintf(" error %d\n", error); |
| 429 | if (error && error != EDEADLK) { |
| 430 | kprintf("error %d\n", error); |
| 431 | Debugger("hammer_update_inode2"); |
| 432 | } |
| 433 | if (error == 0) { |
| 434 | ip->flags |= HAMMER_INODE_DELONDISK; |
| 435 | } |
| 436 | if (cursor->node) |
| 437 | hammer_cache_node(cursor->node, &ip->cache[0]); |
| 438 | } |
| 439 | if (error == EDEADLK) { |
| 440 | hammer_done_cursor(cursor); |
| 441 | error = hammer_init_cursor(trans, cursor, |
| 442 | &ip->cache[0], ip); |
| 443 | if (hammer_debug_inode) |
| 444 | kprintf("IPDED %p %d\n", ip, error); |
| 445 | if (error == 0) |
| 446 | goto retry; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Ok, write out the initial record or a new record (after deleting |
| 452 | * the old one), unless the DELETED flag is set. This routine will |
| 453 | * clear DELONDISK if it writes out a record. |
| 454 | * |
| 455 | * Update our inode statistics if this is the first application of |
| 456 | * the inode on-disk. |
| 457 | */ |
| 458 | if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { |
| 459 | /* |
| 460 | * Generate a record and write it to the media |
| 461 | */ |
| 462 | record = hammer_alloc_mem_record(ip); |
| 463 | record->type = HAMMER_MEM_RECORD_GENERAL; |
| 464 | record->flush_state = HAMMER_FST_FLUSH; |
| 465 | record->rec.inode = ip->sync_ino_rec; |
| 466 | record->rec.inode.base.base.create_tid = trans->tid; |
| 467 | record->rec.inode.base.data_len = sizeof(ip->sync_ino_data); |
| 468 | record->data = (void *)&ip->sync_ino_data; |
| 469 | record->flags |= HAMMER_RECF_INTERLOCK_BE; |
| 470 | for (;;) { |
| 471 | error = hammer_ip_sync_record_cursor(cursor, record); |
| 472 | if (hammer_debug_inode) |
| 473 | kprintf("GENREC %p rec %08x %d\n", |
| 474 | ip, record->flags, error); |
| 475 | if (error != EDEADLK) |
| 476 | break; |
| 477 | hammer_done_cursor(cursor); |
| 478 | error = hammer_init_cursor(trans, cursor, |
| 479 | &ip->cache[0], ip); |
| 480 | if (hammer_debug_inode) |
| 481 | kprintf("GENREC reinit %d\n", error); |
| 482 | if (error) |
| 483 | break; |
| 484 | } |
| 485 | if (error) { |
| 486 | kprintf("error %d\n", error); |
| 487 | Debugger("hammer_update_inode3"); |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * The record isn't managed by the inode's record tree, |
| 492 | * destroy it whether we succeed or fail. |
| 493 | */ |
| 494 | record->flags &= ~HAMMER_RECF_INTERLOCK_BE; |
| 495 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 496 | record->flush_state = HAMMER_FST_IDLE; |
| 497 | hammer_rel_mem_record(record); |
| 498 | |
| 499 | /* |
| 500 | * Finish up. |
| 501 | */ |
| 502 | if (error == 0) { |
| 503 | if (hammer_debug_inode) |
| 504 | kprintf("CLEANDELOND %p %08x\n", ip, ip->flags); |
| 505 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY | |
| 506 | HAMMER_INODE_DDIRTY | |
| 507 | HAMMER_INODE_ITIMES); |
| 508 | ip->flags &= ~HAMMER_INODE_DELONDISK; |
| 509 | |
| 510 | /* |
| 511 | * Root volume count of inodes |
| 512 | */ |
| 513 | if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { |
| 514 | hammer_modify_volume_field(trans, |
| 515 | trans->rootvol, |
| 516 | vol0_stat_inodes); |
| 517 | ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 518 | hammer_modify_volume_done(trans->rootvol); |
| 519 | ip->flags |= HAMMER_INODE_ONDISK; |
| 520 | if (hammer_debug_inode) |
| 521 | kprintf("NOWONDISK %p\n", ip); |
| 522 | } |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * If the inode has been destroyed, clean out any left-over flags |
| 528 | * that may have been set by the frontend. |
| 529 | */ |
| 530 | if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { |
| 531 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY | |
| 532 | HAMMER_INODE_DDIRTY | |
| 533 | HAMMER_INODE_ITIMES); |
| 534 | } |
| 535 | return(error); |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Update only the itimes fields. This is done no-historically. The |
| 540 | * record is updated in-place on the disk. |
| 541 | */ |
| 542 | static int |
| 543 | hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) |
| 544 | { |
| 545 | hammer_transaction_t trans = cursor->trans; |
| 546 | struct hammer_inode_record *rec; |
| 547 | int error; |
| 548 | |
| 549 | retry: |
| 550 | error = 0; |
| 551 | if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == |
| 552 | HAMMER_INODE_ONDISK) { |
| 553 | hammer_normalize_cursor(cursor); |
| 554 | cursor->key_beg.obj_id = ip->obj_id; |
| 555 | cursor->key_beg.key = 0; |
| 556 | cursor->key_beg.create_tid = 0; |
| 557 | cursor->key_beg.delete_tid = 0; |
| 558 | cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 559 | cursor->key_beg.obj_type = 0; |
| 560 | cursor->asof = ip->obj_asof; |
| 561 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 562 | cursor->flags |= HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_ASOF; |
| 563 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 564 | |
| 565 | error = hammer_btree_lookup(cursor); |
| 566 | if (error) { |
| 567 | kprintf("error %d\n", error); |
| 568 | Debugger("hammer_update_itimes1"); |
| 569 | } |
| 570 | if (error == 0) { |
| 571 | /* |
| 572 | * Do not generate UNDO records for atime/mtime |
| 573 | * updates. |
| 574 | */ |
| 575 | rec = &cursor->record->inode; |
| 576 | hammer_modify_buffer(trans, cursor->record_buffer, |
| 577 | NULL, 0); |
| 578 | rec->ino_atime = ip->sync_ino_rec.ino_atime; |
| 579 | rec->ino_mtime = ip->sync_ino_rec.ino_mtime; |
| 580 | hammer_modify_buffer_done(cursor->record_buffer); |
| 581 | ip->sync_flags &= ~HAMMER_INODE_ITIMES; |
| 582 | /* XXX recalculate crc */ |
| 583 | hammer_cache_node(cursor->node, &ip->cache[0]); |
| 584 | } |
| 585 | if (error == EDEADLK) { |
| 586 | hammer_done_cursor(cursor); |
| 587 | error = hammer_init_cursor(trans, cursor, |
| 588 | &ip->cache[0], ip); |
| 589 | if (error == 0) |
| 590 | goto retry; |
| 591 | } |
| 592 | } |
| 593 | return(error); |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Release a reference on an inode, flush as requested. |
| 598 | * |
| 599 | * On the last reference we queue the inode to the flusher for its final |
| 600 | * disposition. |
| 601 | */ |
| 602 | void |
| 603 | hammer_rel_inode(struct hammer_inode *ip, int flush) |
| 604 | { |
| 605 | hammer_mount_t hmp = ip->hmp; |
| 606 | |
| 607 | /* |
| 608 | * Handle disposition when dropping the last ref. |
| 609 | */ |
| 610 | for (;;) { |
| 611 | if (ip->lock.refs == 1) { |
| 612 | /* |
| 613 | * Determine whether on-disk action is needed for |
| 614 | * the inode's final disposition. |
| 615 | */ |
| 616 | KKASSERT(ip->vp == NULL); |
| 617 | hammer_inode_unloadable_check(ip, 0); |
| 618 | if (ip->flags & HAMMER_INODE_MODMASK) { |
| 619 | hammer_flush_inode(ip, 0); |
| 620 | } else if (ip->lock.refs == 1) { |
| 621 | hammer_unload_inode(ip); |
| 622 | break; |
| 623 | } |
| 624 | } else { |
| 625 | if (flush) |
| 626 | hammer_flush_inode(ip, 0); |
| 627 | |
| 628 | /* |
| 629 | * The inode still has multiple refs, try to drop |
| 630 | * one ref. |
| 631 | */ |
| 632 | KKASSERT(ip->lock.refs >= 1); |
| 633 | if (ip->lock.refs > 1) { |
| 634 | hammer_unref(&ip->lock); |
| 635 | break; |
| 636 | } |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * XXX bad hack until I add code to track inodes in SETUP. We |
| 642 | * can queue a lot of inodes to the syncer but if we don't wake |
| 643 | * it up the undo sets will be too large or too many unflushed |
| 644 | * records will build up and blow our malloc limit. |
| 645 | */ |
| 646 | if (++hmp->reclaim_count > 256) { |
| 647 | hmp->reclaim_count = 0; |
| 648 | hammer_flusher_async(hmp); |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * Unload and destroy the specified inode. Must be called with one remaining |
| 654 | * reference. The reference is disposed of. |
| 655 | * |
| 656 | * This can only be called in the context of the flusher. |
| 657 | */ |
| 658 | static int |
| 659 | hammer_unload_inode(struct hammer_inode *ip) |
| 660 | { |
| 661 | KASSERT(ip->lock.refs == 1, |
| 662 | ("hammer_unload_inode: %d refs\n", ip->lock.refs)); |
| 663 | KKASSERT(ip->vp == NULL); |
| 664 | KKASSERT(ip->flush_state == HAMMER_FST_IDLE); |
| 665 | KKASSERT(ip->cursor_ip_refs == 0); |
| 666 | KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); |
| 667 | |
| 668 | KKASSERT(RB_EMPTY(&ip->rec_tree)); |
| 669 | KKASSERT(TAILQ_EMPTY(&ip->target_list)); |
| 670 | KKASSERT(TAILQ_EMPTY(&ip->bio_list)); |
| 671 | KKASSERT(TAILQ_EMPTY(&ip->bio_alt_list)); |
| 672 | |
| 673 | RB_REMOVE(hammer_ino_rb_tree, &ip->hmp->rb_inos_root, ip); |
| 674 | |
| 675 | hammer_uncache_node(&ip->cache[0]); |
| 676 | hammer_uncache_node(&ip->cache[1]); |
| 677 | if (ip->objid_cache) |
| 678 | hammer_clear_objid(ip); |
| 679 | --hammer_count_inodes; |
| 680 | kfree(ip, M_HAMMER); |
| 681 | |
| 682 | return(0); |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * A transaction has modified an inode, requiring updates as specified by |
| 687 | * the passed flags. |
| 688 | * |
| 689 | * HAMMER_INODE_RDIRTY: Inode record has been updated |
| 690 | * HAMMER_INODE_DDIRTY: Inode data has been updated |
| 691 | * HAMMER_INODE_XDIRTY: Dirty in-memory records |
| 692 | * HAMMER_INODE_BUFS: Dirty buffer cache buffers |
| 693 | * HAMMER_INODE_DELETED: Inode record/data must be deleted |
| 694 | * HAMMER_INODE_ITIMES: mtime/atime has been updated |
| 695 | */ |
| 696 | void |
| 697 | hammer_modify_inode(hammer_transaction_t trans, hammer_inode_t ip, int flags) |
| 698 | { |
| 699 | KKASSERT ((ip->flags & HAMMER_INODE_RO) == 0 || |
| 700 | (flags & (HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY| |
| 701 | HAMMER_INODE_XDIRTY|HAMMER_INODE_BUFS| |
| 702 | HAMMER_INODE_DELETED|HAMMER_INODE_ITIMES)) == 0); |
| 703 | |
| 704 | ip->flags |= flags; |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * Request that an inode be flushed. This whole mess cannot block and may |
| 709 | * recurse. Once requested HAMMER will attempt to actively flush it until |
| 710 | * the flush can be done. |
| 711 | * |
| 712 | * The inode may already be flushing, or may be in a setup state. We can |
| 713 | * place the inode in a flushing state if it is currently idle and flag it |
| 714 | * to reflush if it is currently flushing. |
| 715 | */ |
| 716 | void |
| 717 | hammer_flush_inode(hammer_inode_t ip, int flags) |
| 718 | { |
| 719 | hammer_record_t depend; |
| 720 | int r, good; |
| 721 | |
| 722 | /* |
| 723 | * Trivial 'nothing to flush' case. If the inode is ina SETUP |
| 724 | * state we have to put it back into an IDLE state so we can |
| 725 | * drop the extra ref. |
| 726 | */ |
| 727 | if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { |
| 728 | if (ip->flush_state == HAMMER_FST_SETUP) { |
| 729 | ip->flush_state = HAMMER_FST_IDLE; |
| 730 | hammer_rel_inode(ip, 0); |
| 731 | } |
| 732 | return; |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * Our flush action will depend on the current state. |
| 737 | */ |
| 738 | switch(ip->flush_state) { |
| 739 | case HAMMER_FST_IDLE: |
| 740 | /* |
| 741 | * We have no dependancies and can flush immediately. Some |
| 742 | * our children may not be flushable so we have to re-test |
| 743 | * with that additional knowledge. |
| 744 | */ |
| 745 | hammer_flush_inode_core(ip, flags); |
| 746 | break; |
| 747 | case HAMMER_FST_SETUP: |
| 748 | /* |
| 749 | * Recurse upwards through dependancies via target_list |
| 750 | * and start their flusher actions going if possible. |
| 751 | * |
| 752 | * 'good' is our connectivity. -1 means we have none and |
| 753 | * can't flush, 0 means there weren't any dependancies, and |
| 754 | * 1 means we have good connectivity. |
| 755 | */ |
| 756 | good = 0; |
| 757 | TAILQ_FOREACH(depend, &ip->target_list, target_entry) { |
| 758 | r = hammer_setup_parent_inodes(depend); |
| 759 | if (r < 0 && good == 0) |
| 760 | good = -1; |
| 761 | if (r > 0) |
| 762 | good = 1; |
| 763 | } |
| 764 | |
| 765 | /* |
| 766 | * We can continue if good >= 0. Determine how many records |
| 767 | * under our inode can be flushed (and mark them). |
| 768 | */ |
| 769 | if (good >= 0) { |
| 770 | hammer_flush_inode_core(ip, flags); |
| 771 | } else { |
| 772 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 773 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 774 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 775 | hammer_flusher_async(ip->hmp); |
| 776 | } |
| 777 | } |
| 778 | break; |
| 779 | default: |
| 780 | /* |
| 781 | * We are already flushing, flag the inode to reflush |
| 782 | * if needed after it completes its current flush. |
| 783 | */ |
| 784 | if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) |
| 785 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 786 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 787 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 788 | hammer_flusher_async(ip->hmp); |
| 789 | } |
| 790 | break; |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * We are asked to recurse upwards and convert the record from SETUP |
| 796 | * to FLUSH if possible. record->ip is a parent of the caller's inode, |
| 797 | * and record->target_ip is the caller's inode. |
| 798 | * |
| 799 | * Return 1 if the record gives us connectivity |
| 800 | * |
| 801 | * Return 0 if the record is not relevant |
| 802 | * |
| 803 | * Return -1 if we can't resolve the dependancy and there is no connectivity. |
| 804 | */ |
| 805 | static int |
| 806 | hammer_setup_parent_inodes(hammer_record_t record) |
| 807 | { |
| 808 | hammer_mount_t hmp = record->ip->hmp; |
| 809 | hammer_record_t depend; |
| 810 | hammer_inode_t ip; |
| 811 | int r, good; |
| 812 | |
| 813 | KKASSERT(record->flush_state != HAMMER_FST_IDLE); |
| 814 | ip = record->ip; |
| 815 | |
| 816 | /* |
| 817 | * If the record is already flushing, is it in our flush group? |
| 818 | * |
| 819 | * If it is in our flush group but it is a general record or a |
| 820 | * delete-on-disk, it does not improve our connectivity (return 0), |
| 821 | * and if the target inode is not trying to destroy itself we can't |
| 822 | * allow the operation yet anyway (the second return -1). |
| 823 | */ |
| 824 | if (record->flush_state == HAMMER_FST_FLUSH) { |
| 825 | if (record->flush_group != hmp->flusher_next) { |
| 826 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 827 | return(-1); |
| 828 | } |
| 829 | if (record->type == HAMMER_MEM_RECORD_ADD) |
| 830 | return(1); |
| 831 | /* GENERAL or DEL */ |
| 832 | return(0); |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * It must be a setup record. Try to resolve the setup dependancies |
| 837 | * by recursing upwards so we can place ip on the flush list. |
| 838 | */ |
| 839 | KKASSERT(record->flush_state == HAMMER_FST_SETUP); |
| 840 | |
| 841 | good = 0; |
| 842 | TAILQ_FOREACH(depend, &ip->target_list, target_entry) { |
| 843 | r = hammer_setup_parent_inodes(depend); |
| 844 | if (r < 0 && good == 0) |
| 845 | good = -1; |
| 846 | if (r > 0) |
| 847 | good = 1; |
| 848 | } |
| 849 | |
| 850 | /* |
| 851 | * We can't flush ip because it has no connectivity (XXX also check |
| 852 | * nlinks for pre-existing connectivity!). Flag it so any resolution |
| 853 | * recurses back down. |
| 854 | */ |
| 855 | if (good < 0) { |
| 856 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 857 | return(good); |
| 858 | } |
| 859 | |
| 860 | /* |
| 861 | * We are go, place the parent inode in a flushing state so we can |
| 862 | * place its record in a flushing state. Note that the parent |
| 863 | * may already be flushing. The record must be in the same flush |
| 864 | * group as the parent. |
| 865 | */ |
| 866 | if (ip->flush_state != HAMMER_FST_FLUSH) |
| 867 | hammer_flush_inode_core(ip, HAMMER_FLUSH_RECURSION); |
| 868 | KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); |
| 869 | KKASSERT(record->flush_state == HAMMER_FST_SETUP); |
| 870 | |
| 871 | #if 0 |
| 872 | if (record->type == HAMMER_MEM_RECORD_DEL && |
| 873 | (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { |
| 874 | /* |
| 875 | * Regardless of flushing state we cannot sync this path if the |
| 876 | * record represents a delete-on-disk but the target inode |
| 877 | * is not ready to sync its own deletion. |
| 878 | * |
| 879 | * XXX need to count effective nlinks to determine whether |
| 880 | * the flush is ok, otherwise removing a hardlink will |
| 881 | * just leave the DEL record to rot. |
| 882 | */ |
| 883 | record->target_ip->flags |= HAMMER_INODE_REFLUSH; |
| 884 | return(-1); |
| 885 | } else |
| 886 | #endif |
| 887 | if (ip->flush_group == ip->hmp->flusher_next) { |
| 888 | /* |
| 889 | * This is the record we wanted to synchronize. |
| 890 | */ |
| 891 | record->flush_state = HAMMER_FST_FLUSH; |
| 892 | record->flush_group = ip->flush_group; |
| 893 | hammer_ref(&record->lock); |
| 894 | if (record->type == HAMMER_MEM_RECORD_ADD) |
| 895 | return(1); |
| 896 | |
| 897 | /* |
| 898 | * A general or delete-on-disk record does not contribute |
| 899 | * to our visibility. We can still flush it, however. |
| 900 | */ |
| 901 | return(0); |
| 902 | } else { |
| 903 | /* |
| 904 | * We couldn't resolve the dependancies, request that the |
| 905 | * inode be flushed when the dependancies can be resolved. |
| 906 | */ |
| 907 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 908 | return(-1); |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | /* |
| 913 | * This is the core routine placing an inode into the FST_FLUSH state. |
| 914 | */ |
| 915 | static void |
| 916 | hammer_flush_inode_core(hammer_inode_t ip, int flags) |
| 917 | { |
| 918 | int go_count; |
| 919 | |
| 920 | /* |
| 921 | * Set flush state and prevent the flusher from cycling into |
| 922 | * the next flush group. Do not place the ip on the list yet. |
| 923 | * Inodes not in the idle state get an extra reference. |
| 924 | */ |
| 925 | KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); |
| 926 | if (ip->flush_state == HAMMER_FST_IDLE) |
| 927 | hammer_ref(&ip->lock); |
| 928 | ip->flush_state = HAMMER_FST_FLUSH; |
| 929 | ip->flush_group = ip->hmp->flusher_next; |
| 930 | ++ip->hmp->flusher_lock; |
| 931 | |
| 932 | /* |
| 933 | * We need to be able to vfsync/truncate from the backend. |
| 934 | */ |
| 935 | KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); |
| 936 | if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { |
| 937 | ip->flags |= HAMMER_INODE_VHELD; |
| 938 | vref(ip->vp); |
| 939 | } |
| 940 | |
| 941 | /* |
| 942 | * Figure out how many in-memory records we can actually flush |
| 943 | * (not including inode meta-data, buffers, etc). |
| 944 | */ |
| 945 | if (flags & HAMMER_FLUSH_RECURSION) { |
| 946 | go_count = 1; |
| 947 | } else { |
| 948 | go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, |
| 949 | hammer_setup_child_callback, NULL); |
| 950 | } |
| 951 | |
| 952 | /* |
| 953 | * This is a more involved test that includes go_count. If we |
| 954 | * can't flush, flag the inode and return. If go_count is 0 we |
| 955 | * were are unable to flush any records in our rec_tree and |
| 956 | * must ignore the XDIRTY flag. |
| 957 | */ |
| 958 | if (go_count == 0) { |
| 959 | if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { |
| 960 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 961 | ip->flush_state = HAMMER_FST_SETUP; |
| 962 | if (ip->flags & HAMMER_INODE_VHELD) { |
| 963 | ip->flags &= ~HAMMER_INODE_VHELD; |
| 964 | vrele(ip->vp); |
| 965 | } |
| 966 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 967 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 968 | hammer_flusher_async(ip->hmp); |
| 969 | } |
| 970 | if (--ip->hmp->flusher_lock == 0) |
| 971 | wakeup(&ip->hmp->flusher_lock); |
| 972 | return; |
| 973 | } |
| 974 | } |
| 975 | |
| 976 | /* |
| 977 | * Snapshot the state of the inode for the backend flusher. |
| 978 | * |
| 979 | * The truncation must be retained in the frontend until after |
| 980 | * we've actually performed the record deletion. |
| 981 | * |
| 982 | * NOTE: The DELETING flag is a mod flag, but it is also sticky, |
| 983 | * and stays in ip->flags. Once set, it stays set until the |
| 984 | * inode is destroyed. |
| 985 | */ |
| 986 | ip->sync_flags = (ip->flags & HAMMER_INODE_MODMASK); |
| 987 | ip->sync_trunc_off = ip->trunc_off; |
| 988 | ip->sync_ino_rec = ip->ino_rec; |
| 989 | ip->sync_ino_data = ip->ino_data; |
| 990 | ip->flags &= ~HAMMER_INODE_MODMASK | HAMMER_INODE_TRUNCATED; |
| 991 | |
| 992 | /* |
| 993 | * The flusher list inherits our inode and reference. |
| 994 | */ |
| 995 | TAILQ_INSERT_TAIL(&ip->hmp->flush_list, ip, flush_entry); |
| 996 | if (--ip->hmp->flusher_lock == 0) |
| 997 | wakeup(&ip->hmp->flusher_lock); |
| 998 | |
| 999 | if (flags & HAMMER_FLUSH_SIGNAL) |
| 1000 | hammer_flusher_async(ip->hmp); |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Callback for scan of ip->rec_tree. Try to include each record in our |
| 1005 | * flush. ip->flush_group has been set but the inode has not yet been |
| 1006 | * moved into a flushing state. |
| 1007 | * |
| 1008 | * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on |
| 1009 | * both inodes. |
| 1010 | * |
| 1011 | * We return 1 for any record placed or found in FST_FLUSH, which prevents |
| 1012 | * the caller from shortcutting the flush. |
| 1013 | */ |
| 1014 | static int |
| 1015 | hammer_setup_child_callback(hammer_record_t rec, void *data) |
| 1016 | { |
| 1017 | hammer_inode_t target_ip; |
| 1018 | hammer_inode_t ip; |
| 1019 | int r; |
| 1020 | |
| 1021 | /* |
| 1022 | * If the record has been deleted by the backend (it's being held |
| 1023 | * by the frontend in a race), just ignore it. |
| 1024 | */ |
| 1025 | if (rec->flags & HAMMER_RECF_DELETED_BE) |
| 1026 | return(0); |
| 1027 | |
| 1028 | /* |
| 1029 | * If the record is in an idle state it has no dependancies and |
| 1030 | * can be flushed. |
| 1031 | */ |
| 1032 | ip = rec->ip; |
| 1033 | r = 0; |
| 1034 | |
| 1035 | switch(rec->flush_state) { |
| 1036 | case HAMMER_FST_IDLE: |
| 1037 | /* |
| 1038 | * Record has no setup dependancy, we can flush it. |
| 1039 | */ |
| 1040 | KKASSERT(rec->target_ip == NULL); |
| 1041 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1042 | rec->flush_group = ip->flush_group; |
| 1043 | hammer_ref(&rec->lock); |
| 1044 | r = 1; |
| 1045 | break; |
| 1046 | case HAMMER_FST_SETUP: |
| 1047 | /* |
| 1048 | * Record has a setup dependancy. Try to include the |
| 1049 | * target ip in the flush. |
| 1050 | * |
| 1051 | * We have to be careful here, if we do not do the right |
| 1052 | * thing we can lose track of dirty inodes and the system |
| 1053 | * will lockup trying to allocate buffers. |
| 1054 | */ |
| 1055 | target_ip = rec->target_ip; |
| 1056 | KKASSERT(target_ip != NULL); |
| 1057 | KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); |
| 1058 | if (target_ip->flush_state == HAMMER_FST_FLUSH) { |
| 1059 | /* |
| 1060 | * If the target IP is already flushing in our group |
| 1061 | * we are golden, otherwise make sure the target |
| 1062 | * reflushes. |
| 1063 | */ |
| 1064 | if (target_ip->flush_group == ip->flush_group) { |
| 1065 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1066 | rec->flush_group = ip->flush_group; |
| 1067 | hammer_ref(&rec->lock); |
| 1068 | r = 1; |
| 1069 | } else { |
| 1070 | target_ip->flags |= HAMMER_INODE_REFLUSH; |
| 1071 | } |
| 1072 | } else if (rec->type == HAMMER_MEM_RECORD_ADD) { |
| 1073 | /* |
| 1074 | * If the target IP is not flushing we can force |
| 1075 | * it to flush, even if it is unable to write out |
| 1076 | * any of its own records we have at least one in |
| 1077 | * hand that we CAN deal with. |
| 1078 | */ |
| 1079 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1080 | rec->flush_group = ip->flush_group; |
| 1081 | hammer_ref(&rec->lock); |
| 1082 | hammer_flush_inode_core(target_ip, |
| 1083 | HAMMER_FLUSH_RECURSION); |
| 1084 | r = 1; |
| 1085 | } else { |
| 1086 | /* |
| 1087 | * General or delete-on-disk record. |
| 1088 | * |
| 1089 | * XXX this needs help. If a delete-on-disk we could |
| 1090 | * disconnect the target. If the target has its own |
| 1091 | * dependancies they really need to be flushed. |
| 1092 | * |
| 1093 | * XXX |
| 1094 | */ |
| 1095 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1096 | rec->flush_group = ip->flush_group; |
| 1097 | hammer_ref(&rec->lock); |
| 1098 | hammer_flush_inode_core(target_ip, |
| 1099 | HAMMER_FLUSH_RECURSION); |
| 1100 | r = 1; |
| 1101 | } |
| 1102 | break; |
| 1103 | case HAMMER_FST_FLUSH: |
| 1104 | /* |
| 1105 | * Record already associated with a flush group. It had |
| 1106 | * better be ours. |
| 1107 | */ |
| 1108 | KKASSERT(rec->flush_group == ip->flush_group); |
| 1109 | r = 1; |
| 1110 | break; |
| 1111 | } |
| 1112 | return(r); |
| 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | * Wait for a previously queued flush to complete |
| 1117 | */ |
| 1118 | void |
| 1119 | hammer_wait_inode(hammer_inode_t ip) |
| 1120 | { |
| 1121 | while (ip->flush_state != HAMMER_FST_IDLE) { |
| 1122 | ip->flags |= HAMMER_INODE_FLUSHW; |
| 1123 | tsleep(&ip->flags, 0, "hmrwin", 0); |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | /* |
| 1128 | * Called by the backend code when a flush has been completed. |
| 1129 | * The inode has already been removed from the flush list. |
| 1130 | * |
| 1131 | * A pipelined flush can occur, in which case we must re-enter the |
| 1132 | * inode on the list and re-copy its fields. |
| 1133 | */ |
| 1134 | void |
| 1135 | hammer_flush_inode_done(hammer_inode_t ip) |
| 1136 | { |
| 1137 | struct bio *bio; |
| 1138 | int dorel = 0; |
| 1139 | |
| 1140 | KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); |
| 1141 | |
| 1142 | /* |
| 1143 | * Allow BIOs to queue to the inode's primary bioq again. |
| 1144 | */ |
| 1145 | ip->flags &= ~HAMMER_INODE_WRITE_ALT; |
| 1146 | |
| 1147 | /* |
| 1148 | * Merge left-over flags back into the frontend and fix the state. |
| 1149 | */ |
| 1150 | ip->flags |= ip->sync_flags; |
| 1151 | |
| 1152 | /* |
| 1153 | * The backend may have adjusted nlinks, so if the adjusted nlinks |
| 1154 | * does not match the fronttend set the frontend's RDIRTY flag again. |
| 1155 | */ |
| 1156 | if (ip->ino_rec.ino_nlinks != ip->sync_ino_rec.ino_nlinks) |
| 1157 | ip->flags |= HAMMER_INODE_RDIRTY; |
| 1158 | |
| 1159 | /* |
| 1160 | * Reflush any BIOs that wound up in the alt list. Our inode will |
| 1161 | * also wind up at the end of the flusher's list. |
| 1162 | */ |
| 1163 | while ((bio = TAILQ_FIRST(&ip->bio_alt_list)) != NULL) { |
| 1164 | TAILQ_REMOVE(&ip->bio_alt_list, bio, bio_act); |
| 1165 | TAILQ_INSERT_TAIL(&ip->bio_list, bio, bio_act); |
| 1166 | } |
| 1167 | /* |
| 1168 | * Fix up the dirty buffer status. |
| 1169 | */ |
| 1170 | if (TAILQ_FIRST(&ip->bio_list) || |
| 1171 | (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree))) { |
| 1172 | ip->flags |= HAMMER_INODE_BUFS; |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * Re-set the XDIRTY flag if some of the inode's in-memory records |
| 1177 | * could not be flushed. |
| 1178 | */ |
| 1179 | if (RB_ROOT(&ip->rec_tree)) |
| 1180 | ip->flags |= HAMMER_INODE_XDIRTY; |
| 1181 | |
| 1182 | /* |
| 1183 | * Do not lose track of inodes which no longer have vnode |
| 1184 | * assocations, otherwise they may never get flushed again. |
| 1185 | */ |
| 1186 | if ((ip->flags & HAMMER_INODE_MODMASK) && ip->vp == NULL) |
| 1187 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 1188 | |
| 1189 | /* |
| 1190 | * Adjust flush_state. The target state (idle or setup) shouldn't |
| 1191 | * be terribly important since we will reflush if we really need |
| 1192 | * to do anything. XXX |
| 1193 | */ |
| 1194 | if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { |
| 1195 | ip->flush_state = HAMMER_FST_IDLE; |
| 1196 | dorel = 1; |
| 1197 | } else { |
| 1198 | ip->flush_state = HAMMER_FST_SETUP; |
| 1199 | } |
| 1200 | |
| 1201 | /* |
| 1202 | * Clean up the vnode ref |
| 1203 | */ |
| 1204 | if (ip->flags & HAMMER_INODE_VHELD) { |
| 1205 | ip->flags &= ~HAMMER_INODE_VHELD; |
| 1206 | vrele(ip->vp); |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * If the frontend made more changes and requested another flush, |
| 1211 | * then try to get it running. |
| 1212 | */ |
| 1213 | if (ip->flags & HAMMER_INODE_REFLUSH) { |
| 1214 | ip->flags &= ~HAMMER_INODE_REFLUSH; |
| 1215 | if (ip->flags & HAMMER_INODE_RESIGNAL) { |
| 1216 | ip->flags &= ~HAMMER_INODE_RESIGNAL; |
| 1217 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1218 | } else { |
| 1219 | hammer_flush_inode(ip, 0); |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | /* |
| 1224 | * Finally, if the frontend is waiting for a flush to complete, |
| 1225 | * wake it up. |
| 1226 | */ |
| 1227 | if (ip->flush_state != HAMMER_FST_FLUSH) { |
| 1228 | if (ip->flags & HAMMER_INODE_FLUSHW) { |
| 1229 | ip->flags &= ~HAMMER_INODE_FLUSHW; |
| 1230 | wakeup(&ip->flags); |
| 1231 | } |
| 1232 | } |
| 1233 | if (dorel) |
| 1234 | hammer_rel_inode(ip, 0); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * Called from hammer_sync_inode() to synchronize in-memory records |
| 1239 | * to the media. |
| 1240 | */ |
| 1241 | static int |
| 1242 | hammer_sync_record_callback(hammer_record_t record, void *data) |
| 1243 | { |
| 1244 | hammer_cursor_t cursor = data; |
| 1245 | hammer_transaction_t trans = cursor->trans; |
| 1246 | int error; |
| 1247 | |
| 1248 | /* |
| 1249 | * Skip records that do not belong to the current flush. |
| 1250 | */ |
| 1251 | if (record->flush_state != HAMMER_FST_FLUSH) |
| 1252 | return(0); |
| 1253 | KKASSERT((record->flags & HAMMER_RECF_DELETED_BE) == 0); |
| 1254 | #if 1 |
| 1255 | if (record->flush_group != record->ip->flush_group) { |
| 1256 | kprintf("sync_record %p ip %p bad flush group %d %d\n", record, record->ip, record->flush_group ,record->ip->flush_group); |
| 1257 | Debugger("blah2"); |
| 1258 | return(0); |
| 1259 | } |
| 1260 | #endif |
| 1261 | KKASSERT(record->flush_group == record->ip->flush_group); |
| 1262 | |
| 1263 | /* |
| 1264 | * Interlock the record using the BE flag. Once BE is set the |
| 1265 | * frontend cannot change the state of FE. |
| 1266 | * |
| 1267 | * NOTE: If FE is set prior to us setting BE we still sync the |
| 1268 | * record out, but the flush completion code converts it to |
| 1269 | * a delete-on-disk record instead of destroying it. |
| 1270 | */ |
| 1271 | KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); |
| 1272 | record->flags |= HAMMER_RECF_INTERLOCK_BE; |
| 1273 | |
| 1274 | /* |
| 1275 | * If DELETED_FE is set we may have already sent dependant pieces |
| 1276 | * to the disk and we must flush the record as if it hadn't been |
| 1277 | * deleted. This creates a bit of a mess because we have to |
| 1278 | * have ip_sync_record convert the record to MEM_RECORD_DEL before |
| 1279 | * it inserts the B-Tree record. Otherwise the media sync might |
| 1280 | * be visible to the frontend. |
| 1281 | */ |
| 1282 | if (record->flags & HAMMER_RECF_DELETED_FE) { |
| 1283 | if (record->type == HAMMER_MEM_RECORD_ADD) { |
| 1284 | record->flags |= HAMMER_RECF_CONVERT_DELETE; |
| 1285 | } else { |
| 1286 | KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); |
| 1287 | return(0); |
| 1288 | } |
| 1289 | } |
| 1290 | |
| 1291 | /* |
| 1292 | * Assign the create_tid for new records. Deletions already |
| 1293 | * have the record's entire key properly set up. |
| 1294 | */ |
| 1295 | if (record->type != HAMMER_MEM_RECORD_DEL) |
| 1296 | record->rec.inode.base.base.create_tid = trans->tid; |
| 1297 | for (;;) { |
| 1298 | error = hammer_ip_sync_record_cursor(cursor, record); |
| 1299 | if (error != EDEADLK) |
| 1300 | break; |
| 1301 | hammer_done_cursor(cursor); |
| 1302 | error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], |
| 1303 | record->ip); |
| 1304 | if (error) |
| 1305 | break; |
| 1306 | } |
| 1307 | record->flags &= ~HAMMER_RECF_CONVERT_DELETE; |
| 1308 | |
| 1309 | if (error) { |
| 1310 | error = -error; |
| 1311 | if (error != -ENOSPC) { |
| 1312 | kprintf("hammer_sync_record_callback: sync failed rec " |
| 1313 | "%p, error %d\n", record, error); |
| 1314 | Debugger("sync failed rec"); |
| 1315 | } |
| 1316 | } |
| 1317 | hammer_flush_record_done(record, error); |
| 1318 | return(error); |
| 1319 | } |
| 1320 | |
| 1321 | /* |
| 1322 | * XXX error handling |
| 1323 | */ |
| 1324 | int |
| 1325 | hammer_sync_inode(hammer_inode_t ip) |
| 1326 | { |
| 1327 | struct hammer_transaction trans; |
| 1328 | struct hammer_cursor cursor; |
| 1329 | struct bio *bio; |
| 1330 | hammer_record_t depend; |
| 1331 | hammer_record_t next; |
| 1332 | int error, tmp_error; |
| 1333 | u_int64_t nlinks; |
| 1334 | |
| 1335 | if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) |
| 1336 | return(0); |
| 1337 | |
| 1338 | hammer_start_transaction_fls(&trans, ip->hmp); |
| 1339 | error = hammer_init_cursor(&trans, &cursor, &ip->cache[0], ip); |
| 1340 | if (error) |
| 1341 | goto done; |
| 1342 | |
| 1343 | /* |
| 1344 | * Any directory records referencing this inode which are not in |
| 1345 | * our current flush group must adjust our nlink count for the |
| 1346 | * purposes of synchronization to disk. |
| 1347 | * |
| 1348 | * Records which are in our flush group can be unlinked from our |
| 1349 | * inode now, potentially allowing the inode to be physically |
| 1350 | * deleted. |
| 1351 | */ |
| 1352 | nlinks = ip->ino_rec.ino_nlinks; |
| 1353 | next = TAILQ_FIRST(&ip->target_list); |
| 1354 | while ((depend = next) != NULL) { |
| 1355 | next = TAILQ_NEXT(depend, target_entry); |
| 1356 | if (depend->flush_state == HAMMER_FST_FLUSH && |
| 1357 | depend->flush_group == ip->hmp->flusher_act) { |
| 1358 | /* |
| 1359 | * If this is an ADD that was deleted by the frontend |
| 1360 | * the frontend nlinks count will have already been |
| 1361 | * decremented, but the backend is going to sync its |
| 1362 | * directory entry and must account for it. The |
| 1363 | * record will be converted to a delete-on-disk when |
| 1364 | * it gets synced. |
| 1365 | * |
| 1366 | * If the ADD was not deleted by the frontend we |
| 1367 | * can remove the dependancy from our target_list. |
| 1368 | */ |
| 1369 | if (depend->flags & HAMMER_RECF_DELETED_FE) { |
| 1370 | ++nlinks; |
| 1371 | } else { |
| 1372 | TAILQ_REMOVE(&ip->target_list, depend, |
| 1373 | target_entry); |
| 1374 | depend->target_ip = NULL; |
| 1375 | } |
| 1376 | } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { |
| 1377 | /* |
| 1378 | * Not part of our flush group |
| 1379 | */ |
| 1380 | KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); |
| 1381 | switch(depend->type) { |
| 1382 | case HAMMER_MEM_RECORD_ADD: |
| 1383 | --nlinks; |
| 1384 | break; |
| 1385 | case HAMMER_MEM_RECORD_DEL: |
| 1386 | ++nlinks; |
| 1387 | break; |
| 1388 | default: |
| 1389 | break; |
| 1390 | } |
| 1391 | } |
| 1392 | } |
| 1393 | |
| 1394 | /* |
| 1395 | * Set dirty if we had to modify the link count. |
| 1396 | */ |
| 1397 | if (ip->sync_ino_rec.ino_nlinks != nlinks) { |
| 1398 | KKASSERT((int64_t)nlinks >= 0); |
| 1399 | ip->sync_ino_rec.ino_nlinks = nlinks; |
| 1400 | ip->sync_flags |= HAMMER_INODE_RDIRTY; |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * Queue up as many dirty buffers as we can then set a flag to |
| 1405 | * cause any further BIOs to go to the alternative queue. |
| 1406 | */ |
| 1407 | if (ip->flags & HAMMER_INODE_VHELD) |
| 1408 | error = vfsync(ip->vp, MNT_NOWAIT, 1, NULL, NULL); |
| 1409 | ip->flags |= HAMMER_INODE_WRITE_ALT; |
| 1410 | |
| 1411 | /* |
| 1412 | * The buffer cache may contain dirty buffers beyond the inode |
| 1413 | * state we copied from the frontend to the backend. Because |
| 1414 | * we are syncing our buffer cache on the backend, resync |
| 1415 | * the truncation point and the file size so we don't wipe out |
| 1416 | * any data. |
| 1417 | * |
| 1418 | * Syncing the buffer cache on the frontend has serious problems |
| 1419 | * because it prevents us from passively queueing dirty inodes |
| 1420 | * to the backend (the BIO's could stall indefinitely). |
| 1421 | */ |
| 1422 | if (ip->flags & HAMMER_INODE_TRUNCATED) { |
| 1423 | ip->sync_trunc_off = ip->trunc_off; |
| 1424 | ip->sync_flags |= HAMMER_INODE_TRUNCATED; |
| 1425 | } |
| 1426 | if (ip->sync_ino_rec.ino_size != ip->ino_rec.ino_size) { |
| 1427 | ip->sync_ino_rec.ino_size = ip->ino_rec.ino_size; |
| 1428 | ip->sync_flags |= HAMMER_INODE_RDIRTY; |
| 1429 | } |
| 1430 | |
| 1431 | /* |
| 1432 | * If there is a trunction queued destroy any data past the (aligned) |
| 1433 | * truncation point. Userland will have dealt with the buffer |
| 1434 | * containing the truncation point for us. |
| 1435 | * |
| 1436 | * We don't flush pending frontend data buffers until after we've |
| 1437 | * dealth with the truncation. |
| 1438 | * |
| 1439 | * Don't bother if the inode is or has been deleted. |
| 1440 | */ |
| 1441 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 1442 | /* |
| 1443 | * Interlock trunc_off. The VOP front-end may continue to |
| 1444 | * make adjustments to it while we are blocked. |
| 1445 | */ |
| 1446 | off_t trunc_off; |
| 1447 | off_t aligned_trunc_off; |
| 1448 | |
| 1449 | trunc_off = ip->sync_trunc_off; |
| 1450 | aligned_trunc_off = (trunc_off + HAMMER_BUFMASK) & |
| 1451 | ~HAMMER_BUFMASK64; |
| 1452 | |
| 1453 | /* |
| 1454 | * Delete any whole blocks on-media. The front-end has |
| 1455 | * already cleaned out any partial block and made it |
| 1456 | * pending. The front-end may have updated trunc_off |
| 1457 | * while we were blocked so do not just unconditionally |
| 1458 | * set it to the maximum offset. |
| 1459 | */ |
| 1460 | error = hammer_ip_delete_range(&cursor, ip, |
| 1461 | aligned_trunc_off, |
| 1462 | 0x7FFFFFFFFFFFFFFFLL); |
| 1463 | if (error) |
| 1464 | Debugger("hammer_ip_delete_range errored"); |
| 1465 | ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; |
| 1466 | if (ip->trunc_off >= trunc_off) { |
| 1467 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 1468 | ip->flags &= ~HAMMER_INODE_TRUNCATED; |
| 1469 | } |
| 1470 | } else { |
| 1471 | error = 0; |
| 1472 | } |
| 1473 | |
| 1474 | /* |
| 1475 | * Now sync related records. These will typically be directory |
| 1476 | * entries or delete-on-disk records. |
| 1477 | * |
| 1478 | * Not all records will be flushed, but clear XDIRTY anyway. We |
| 1479 | * will set it again in the frontend hammer_flush_inode_done() |
| 1480 | * if records remain. |
| 1481 | */ |
| 1482 | if (error == 0) { |
| 1483 | tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, |
| 1484 | hammer_sync_record_callback, &cursor); |
| 1485 | if (tmp_error < 0) |
| 1486 | tmp_error = -error; |
| 1487 | if (tmp_error) |
| 1488 | error = tmp_error; |
| 1489 | if (error == 0) |
| 1490 | ip->sync_flags &= ~HAMMER_INODE_XDIRTY; |
| 1491 | } |
| 1492 | |
| 1493 | /* |
| 1494 | * If we are deleting the inode the frontend had better not have |
| 1495 | * any active references on elements making up the inode. |
| 1496 | */ |
| 1497 | if (error == 0 && ip->sync_ino_rec.ino_nlinks == 0 && |
| 1498 | RB_EMPTY(&ip->rec_tree) && |
| 1499 | (ip->sync_flags & HAMMER_INODE_DELETING) && |
| 1500 | (ip->flags & HAMMER_INODE_DELETED) == 0) { |
| 1501 | int count1 = 0; |
| 1502 | |
| 1503 | kprintf("Y"); |
| 1504 | ip->flags |= HAMMER_INODE_DELETED; |
| 1505 | error = hammer_ip_delete_range_all(&cursor, ip, &count1); |
| 1506 | if (error == 0) { |
| 1507 | ip->sync_flags &= ~HAMMER_INODE_DELETING; |
| 1508 | ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; |
| 1509 | KKASSERT(RB_EMPTY(&ip->rec_tree)); |
| 1510 | |
| 1511 | /* |
| 1512 | * Set delete_tid in both the frontend and backend |
| 1513 | * copy of the inode record. The DELETED flag handles |
| 1514 | * this, do not set RDIRTY. |
| 1515 | */ |
| 1516 | ip->ino_rec.base.base.delete_tid = trans.tid; |
| 1517 | ip->sync_ino_rec.base.base.delete_tid = trans.tid; |
| 1518 | |
| 1519 | /* |
| 1520 | * Adjust the inode count in the volume header |
| 1521 | */ |
| 1522 | hammer_modify_volume_field(&trans, trans.rootvol, |
| 1523 | vol0_stat_inodes); |
| 1524 | --ip->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 1525 | hammer_modify_volume_done(trans.rootvol); |
| 1526 | } else { |
| 1527 | ip->flags &= ~HAMMER_INODE_DELETED; |
| 1528 | Debugger("hammer_ip_delete_range_all errored"); |
| 1529 | } |
| 1530 | } |
| 1531 | |
| 1532 | /* |
| 1533 | * Flush any queued BIOs. These will just biodone() the IO's if |
| 1534 | * the inode has been deleted. |
| 1535 | */ |
| 1536 | while ((bio = TAILQ_FIRST(&ip->bio_list)) != NULL) { |
| 1537 | TAILQ_REMOVE(&ip->bio_list, bio, bio_act); |
| 1538 | tmp_error = hammer_dowrite(&cursor, ip, bio); |
| 1539 | if (tmp_error) |
| 1540 | error = tmp_error; |
| 1541 | } |
| 1542 | ip->sync_flags &= ~HAMMER_INODE_BUFS; |
| 1543 | |
| 1544 | if (error) |
| 1545 | Debugger("RB_SCAN errored"); |
| 1546 | |
| 1547 | /* |
| 1548 | * Now update the inode's on-disk inode-data and/or on-disk record. |
| 1549 | * DELETED and ONDISK are managed only in ip->flags. |
| 1550 | */ |
| 1551 | switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { |
| 1552 | case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: |
| 1553 | /* |
| 1554 | * If deleted and on-disk, don't set any additional flags. |
| 1555 | * the delete flag takes care of things. |
| 1556 | * |
| 1557 | * Clear flags which may have been set by the frontend. |
| 1558 | */ |
| 1559 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY| |
| 1560 | HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES| |
| 1561 | HAMMER_INODE_DELETING); |
| 1562 | break; |
| 1563 | case HAMMER_INODE_DELETED: |
| 1564 | /* |
| 1565 | * Take care of the case where a deleted inode was never |
| 1566 | * flushed to the disk in the first place. |
| 1567 | * |
| 1568 | * Clear flags which may have been set by the frontend. |
| 1569 | */ |
| 1570 | ip->sync_flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY| |
| 1571 | HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES| |
| 1572 | HAMMER_INODE_DELETING); |
| 1573 | while (RB_ROOT(&ip->rec_tree)) { |
| 1574 | hammer_record_t record = RB_ROOT(&ip->rec_tree); |
| 1575 | hammer_ref(&record->lock); |
| 1576 | KKASSERT(record->lock.refs == 1); |
| 1577 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 1578 | record->flags |= HAMMER_RECF_DELETED_BE; |
| 1579 | hammer_rel_mem_record(record); |
| 1580 | } |
| 1581 | break; |
| 1582 | case HAMMER_INODE_ONDISK: |
| 1583 | /* |
| 1584 | * If already on-disk, do not set any additional flags. |
| 1585 | */ |
| 1586 | break; |
| 1587 | default: |
| 1588 | /* |
| 1589 | * If not on-disk and not deleted, set both dirty flags |
| 1590 | * to force an initial record to be written. Also set |
| 1591 | * the create_tid for the inode. |
| 1592 | * |
| 1593 | * Set create_tid in both the frontend and backend |
| 1594 | * copy of the inode record. |
| 1595 | */ |
| 1596 | ip->ino_rec.base.base.create_tid = trans.tid; |
| 1597 | ip->sync_ino_rec.base.base.create_tid = trans.tid; |
| 1598 | ip->sync_flags |= HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY; |
| 1599 | break; |
| 1600 | } |
| 1601 | |
| 1602 | /* |
| 1603 | * If RDIRTY or DDIRTY is set, write out a new record. If the inode |
| 1604 | * is already on-disk the old record is marked as deleted. |
| 1605 | * |
| 1606 | * If DELETED is set hammer_update_inode() will delete the existing |
| 1607 | * record without writing out a new one. |
| 1608 | * |
| 1609 | * If *ONLY* the ITIMES flag is set we can update the record in-place. |
| 1610 | */ |
| 1611 | if (ip->flags & HAMMER_INODE_DELETED) { |
| 1612 | error = hammer_update_inode(&cursor, ip); |
| 1613 | } else |
| 1614 | if ((ip->sync_flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY | |
| 1615 | HAMMER_INODE_ITIMES)) == HAMMER_INODE_ITIMES) { |
| 1616 | error = hammer_update_itimes(&cursor, ip); |
| 1617 | } else |
| 1618 | if (ip->sync_flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY | |
| 1619 | HAMMER_INODE_ITIMES)) { |
| 1620 | error = hammer_update_inode(&cursor, ip); |
| 1621 | } |
| 1622 | if (error) |
| 1623 | Debugger("hammer_update_itimes/inode errored"); |
| 1624 | done: |
| 1625 | /* |
| 1626 | * Save the TID we used to sync the inode with to make sure we |
| 1627 | * do not improperly reuse it. |
| 1628 | */ |
| 1629 | hammer_done_cursor(&cursor); |
| 1630 | hammer_done_transaction(&trans); |
| 1631 | return(error); |
| 1632 | } |
| 1633 | |
| 1634 | /* |
| 1635 | * This routine is called when the OS is no longer actively referencing |
| 1636 | * the inode (but might still be keeping it cached), or when releasing |
| 1637 | * the last reference to an inode. |
| 1638 | * |
| 1639 | * At this point if the inode's nlinks count is zero we want to destroy |
| 1640 | * it, which may mean destroying it on-media too. |
| 1641 | */ |
| 1642 | void |
| 1643 | hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) |
| 1644 | { |
| 1645 | struct vnode *vp; |
| 1646 | |
| 1647 | /* |
| 1648 | * Set the DELETING flag when the link count drops to 0 and the |
| 1649 | * OS no longer has any opens on the inode. |
| 1650 | * |
| 1651 | * The backend will clear DELETING (a mod flag) and set DELETED |
| 1652 | * (a state flag) when it is actually able to perform the |
| 1653 | * operation. |
| 1654 | */ |
| 1655 | if (ip->ino_rec.ino_nlinks == 0 && |
| 1656 | (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { |
| 1657 | ip->flags |= HAMMER_INODE_DELETING; |
| 1658 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 1659 | ip->trunc_off = 0; |
| 1660 | vp = NULL; |
| 1661 | if (getvp) { |
| 1662 | if (hammer_get_vnode(ip, &vp) != 0) |
| 1663 | return; |
| 1664 | } |
| 1665 | if (ip->vp) { |
| 1666 | vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE); |
| 1667 | vnode_pager_setsize(ip->vp, 0); |
| 1668 | } |
| 1669 | if (getvp) { |
| 1670 | vput(vp); |
| 1671 | } |
| 1672 | } |
| 1673 | } |
| 1674 | |
| 1675 | /* |
| 1676 | * Re-test an inode when a dependancy had gone away to see if we |
| 1677 | * can chain flush it. |
| 1678 | */ |
| 1679 | void |
| 1680 | hammer_test_inode(hammer_inode_t ip) |
| 1681 | { |
| 1682 | if (ip->flags & HAMMER_INODE_REFLUSH) { |
| 1683 | ip->flags &= ~HAMMER_INODE_REFLUSH; |
| 1684 | hammer_ref(&ip->lock); |
| 1685 | if (ip->flags & HAMMER_INODE_RESIGNAL) { |
| 1686 | ip->flags &= ~HAMMER_INODE_RESIGNAL; |
| 1687 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1688 | } else { |
| 1689 | hammer_flush_inode(ip, 0); |
| 1690 | } |
| 1691 | hammer_rel_inode(ip, 0); |
| 1692 | } |
| 1693 | } |
| 1694 | |