| 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 1.78 2008/06/20 05:38:26 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_inode_t ip); |
| 46 | static int hammer_setup_parent_inodes_helper(hammer_record_t record); |
| 47 | static void hammer_inode_wakereclaims(hammer_inode_t ip); |
| 48 | |
| 49 | #ifdef DEBUG_TRUNCATE |
| 50 | extern struct hammer_inode *HammerTruncIp; |
| 51 | #endif |
| 52 | |
| 53 | /* |
| 54 | * The kernel is not actively referencing this vnode but is still holding |
| 55 | * it cached. |
| 56 | * |
| 57 | * This is called from the frontend. |
| 58 | */ |
| 59 | int |
| 60 | hammer_vop_inactive(struct vop_inactive_args *ap) |
| 61 | { |
| 62 | struct hammer_inode *ip = VTOI(ap->a_vp); |
| 63 | |
| 64 | /* |
| 65 | * Degenerate case |
| 66 | */ |
| 67 | if (ip == NULL) { |
| 68 | vrecycle(ap->a_vp); |
| 69 | return(0); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * If the inode no longer has visibility in the filesystem try to |
| 74 | * recycle it immediately, even if the inode is dirty. Recycling |
| 75 | * it quickly allows the system to reclaim buffer cache and VM |
| 76 | * resources which can matter a lot in a heavily loaded system. |
| 77 | * |
| 78 | * This can deadlock in vfsync() if we aren't careful. |
| 79 | * |
| 80 | * Do not queue the inode to the flusher if we still have visibility, |
| 81 | * otherwise namespace calls such as chmod will unnecessarily generate |
| 82 | * multiple inode updates. |
| 83 | */ |
| 84 | hammer_inode_unloadable_check(ip, 0); |
| 85 | if (ip->ino_data.nlinks == 0) { |
| 86 | if (ip->flags & HAMMER_INODE_MODMASK) |
| 87 | hammer_flush_inode(ip, 0); |
| 88 | vrecycle(ap->a_vp); |
| 89 | } |
| 90 | return(0); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Release the vnode association. This is typically (but not always) |
| 95 | * the last reference on the inode. |
| 96 | * |
| 97 | * Once the association is lost we are on our own with regards to |
| 98 | * flushing the inode. |
| 99 | */ |
| 100 | int |
| 101 | hammer_vop_reclaim(struct vop_reclaim_args *ap) |
| 102 | { |
| 103 | struct hammer_inode *ip; |
| 104 | hammer_mount_t hmp; |
| 105 | struct vnode *vp; |
| 106 | |
| 107 | vp = ap->a_vp; |
| 108 | |
| 109 | if ((ip = vp->v_data) != NULL) { |
| 110 | hmp = ip->hmp; |
| 111 | vp->v_data = NULL; |
| 112 | ip->vp = NULL; |
| 113 | |
| 114 | if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) { |
| 115 | ++hammer_count_reclaiming; |
| 116 | ++hmp->inode_reclaims; |
| 117 | ip->flags |= HAMMER_INODE_RECLAIM; |
| 118 | if (hmp->inode_reclaims > HAMMER_RECLAIM_FLUSH && |
| 119 | (hmp->inode_reclaims & 255) == 0) { |
| 120 | hammer_flusher_async(hmp); |
| 121 | } |
| 122 | } |
| 123 | hammer_rel_inode(ip, 1); |
| 124 | } |
| 125 | return(0); |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Return a locked vnode for the specified inode. The inode must be |
| 130 | * referenced but NOT LOCKED on entry and will remain referenced on |
| 131 | * return. |
| 132 | * |
| 133 | * Called from the frontend. |
| 134 | */ |
| 135 | int |
| 136 | hammer_get_vnode(struct hammer_inode *ip, struct vnode **vpp) |
| 137 | { |
| 138 | hammer_mount_t hmp; |
| 139 | struct vnode *vp; |
| 140 | int error = 0; |
| 141 | |
| 142 | hmp = ip->hmp; |
| 143 | |
| 144 | for (;;) { |
| 145 | if ((vp = ip->vp) == NULL) { |
| 146 | error = getnewvnode(VT_HAMMER, hmp->mp, vpp, 0, 0); |
| 147 | if (error) |
| 148 | break; |
| 149 | hammer_lock_ex(&ip->lock); |
| 150 | if (ip->vp != NULL) { |
| 151 | hammer_unlock(&ip->lock); |
| 152 | vp->v_type = VBAD; |
| 153 | vx_put(vp); |
| 154 | continue; |
| 155 | } |
| 156 | hammer_ref(&ip->lock); |
| 157 | vp = *vpp; |
| 158 | ip->vp = vp; |
| 159 | vp->v_type = |
| 160 | hammer_get_vnode_type(ip->ino_data.obj_type); |
| 161 | |
| 162 | hammer_inode_wakereclaims(ip); |
| 163 | |
| 164 | switch(ip->ino_data.obj_type) { |
| 165 | case HAMMER_OBJTYPE_CDEV: |
| 166 | case HAMMER_OBJTYPE_BDEV: |
| 167 | vp->v_ops = &hmp->mp->mnt_vn_spec_ops; |
| 168 | addaliasu(vp, ip->ino_data.rmajor, |
| 169 | ip->ino_data.rminor); |
| 170 | break; |
| 171 | case HAMMER_OBJTYPE_FIFO: |
| 172 | vp->v_ops = &hmp->mp->mnt_vn_fifo_ops; |
| 173 | break; |
| 174 | default: |
| 175 | break; |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * Only mark as the root vnode if the ip is not |
| 180 | * historical, otherwise the VFS cache will get |
| 181 | * confused. The other half of the special handling |
| 182 | * is in hammer_vop_nlookupdotdot(). |
| 183 | */ |
| 184 | if (ip->obj_id == HAMMER_OBJID_ROOT && |
| 185 | ip->obj_asof == hmp->asof) { |
| 186 | vp->v_flag |= VROOT; |
| 187 | } |
| 188 | |
| 189 | vp->v_data = (void *)ip; |
| 190 | /* vnode locked by getnewvnode() */ |
| 191 | /* make related vnode dirty if inode dirty? */ |
| 192 | hammer_unlock(&ip->lock); |
| 193 | if (vp->v_type == VREG) |
| 194 | vinitvmio(vp, ip->ino_data.size); |
| 195 | break; |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * loop if the vget fails (aka races), or if the vp |
| 200 | * no longer matches ip->vp. |
| 201 | */ |
| 202 | if (vget(vp, LK_EXCLUSIVE) == 0) { |
| 203 | if (vp == ip->vp) |
| 204 | break; |
| 205 | vput(vp); |
| 206 | } |
| 207 | } |
| 208 | *vpp = vp; |
| 209 | return(error); |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Acquire a HAMMER inode. The returned inode is not locked. These functions |
| 214 | * do not attach or detach the related vnode (use hammer_get_vnode() for |
| 215 | * that). |
| 216 | * |
| 217 | * The flags argument is only applied for newly created inodes, and only |
| 218 | * certain flags are inherited. |
| 219 | * |
| 220 | * Called from the frontend. |
| 221 | */ |
| 222 | struct hammer_inode * |
| 223 | hammer_get_inode(hammer_transaction_t trans, hammer_inode_t dip, |
| 224 | u_int64_t obj_id, hammer_tid_t asof, int flags, int *errorp) |
| 225 | { |
| 226 | hammer_mount_t hmp = trans->hmp; |
| 227 | struct hammer_inode_info iinfo; |
| 228 | struct hammer_cursor cursor; |
| 229 | struct hammer_inode *ip; |
| 230 | |
| 231 | /* |
| 232 | * Determine if we already have an inode cached. If we do then |
| 233 | * we are golden. |
| 234 | */ |
| 235 | iinfo.obj_id = obj_id; |
| 236 | iinfo.obj_asof = asof; |
| 237 | loop: |
| 238 | ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo); |
| 239 | if (ip) { |
| 240 | hammer_ref(&ip->lock); |
| 241 | *errorp = 0; |
| 242 | return(ip); |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Allocate a new inode structure and deal with races later. |
| 247 | */ |
| 248 | ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO); |
| 249 | ++hammer_count_inodes; |
| 250 | ++hmp->count_inodes; |
| 251 | ip->obj_id = obj_id; |
| 252 | ip->obj_asof = iinfo.obj_asof; |
| 253 | ip->hmp = hmp; |
| 254 | ip->flags = flags & HAMMER_INODE_RO; |
| 255 | ip->cache[0].ip = ip; |
| 256 | ip->cache[1].ip = ip; |
| 257 | if (hmp->ronly) |
| 258 | ip->flags |= HAMMER_INODE_RO; |
| 259 | ip->sync_trunc_off = ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 260 | RB_INIT(&ip->rec_tree); |
| 261 | TAILQ_INIT(&ip->target_list); |
| 262 | |
| 263 | /* |
| 264 | * Locate the on-disk inode. |
| 265 | */ |
| 266 | retry: |
| 267 | hammer_init_cursor(trans, &cursor, (dip ? &dip->cache[0] : NULL), NULL); |
| 268 | cursor.key_beg.localization = HAMMER_LOCALIZE_INODE; |
| 269 | cursor.key_beg.obj_id = ip->obj_id; |
| 270 | cursor.key_beg.key = 0; |
| 271 | cursor.key_beg.create_tid = 0; |
| 272 | cursor.key_beg.delete_tid = 0; |
| 273 | cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 274 | cursor.key_beg.obj_type = 0; |
| 275 | cursor.asof = iinfo.obj_asof; |
| 276 | cursor.flags = HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_GET_DATA | |
| 277 | HAMMER_CURSOR_ASOF; |
| 278 | |
| 279 | *errorp = hammer_btree_lookup(&cursor); |
| 280 | if (*errorp == EDEADLK) { |
| 281 | hammer_done_cursor(&cursor); |
| 282 | goto retry; |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * On success the B-Tree lookup will hold the appropriate |
| 287 | * buffer cache buffers and provide a pointer to the requested |
| 288 | * information. Copy the information to the in-memory inode |
| 289 | * and cache the B-Tree node to improve future operations. |
| 290 | */ |
| 291 | if (*errorp == 0) { |
| 292 | ip->ino_leaf = cursor.node->ondisk->elms[cursor.index].leaf; |
| 293 | ip->ino_data = cursor.data->inode; |
| 294 | |
| 295 | /* |
| 296 | * cache[0] tries to cache the location of the object inode. |
| 297 | * The assumption is that it is near the directory inode. |
| 298 | * |
| 299 | * cache[1] tries to cache the location of the object data. |
| 300 | * The assumption is that it is near the directory data. |
| 301 | */ |
| 302 | hammer_cache_node(&ip->cache[0], cursor.node); |
| 303 | if (dip && dip->cache[1].node) |
| 304 | hammer_cache_node(&ip->cache[1], dip->cache[1].node); |
| 305 | |
| 306 | /* |
| 307 | * The file should not contain any data past the file size |
| 308 | * stored in the inode. Setting sync_trunc_off to the |
| 309 | * file size instead of max reduces B-Tree lookup overheads |
| 310 | * on append by allowing the flusher to avoid checking for |
| 311 | * record overwrites. |
| 312 | */ |
| 313 | ip->sync_trunc_off = ip->ino_data.size; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * The inode is placed on the red-black tree and will be synced to |
| 318 | * the media when flushed or by the filesystem sync. If this races |
| 319 | * another instantiation/lookup the insertion will fail. |
| 320 | */ |
| 321 | if (*errorp == 0) { |
| 322 | hammer_ref(&ip->lock); |
| 323 | if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { |
| 324 | hammer_uncache_node(&ip->cache[0]); |
| 325 | hammer_uncache_node(&ip->cache[1]); |
| 326 | KKASSERT(ip->lock.refs == 1); |
| 327 | --hammer_count_inodes; |
| 328 | --hmp->count_inodes; |
| 329 | kfree(ip, M_HAMMER); |
| 330 | hammer_done_cursor(&cursor); |
| 331 | goto loop; |
| 332 | } |
| 333 | ip->flags |= HAMMER_INODE_ONDISK; |
| 334 | } else { |
| 335 | /* |
| 336 | * Do not panic on read-only accesses which fail, particularly |
| 337 | * historical accesses where the snapshot might not have |
| 338 | * complete connectivity. |
| 339 | */ |
| 340 | if ((flags & HAMMER_INODE_RO) == 0) { |
| 341 | kprintf("hammer_get_inode: failed ip %p obj_id %016llx cursor %p error %d\n", |
| 342 | ip, ip->obj_id, &cursor, *errorp); |
| 343 | Debugger("x"); |
| 344 | } |
| 345 | if (ip->flags & HAMMER_INODE_RSV_INODES) { |
| 346 | ip->flags &= ~HAMMER_INODE_RSV_INODES; /* sanity */ |
| 347 | --hmp->rsv_inodes; |
| 348 | } |
| 349 | hmp->rsv_databufs -= ip->rsv_databufs; |
| 350 | ip->rsv_databufs = 0; /* sanity */ |
| 351 | |
| 352 | --hammer_count_inodes; |
| 353 | --hmp->count_inodes; |
| 354 | kfree(ip, M_HAMMER); |
| 355 | ip = NULL; |
| 356 | } |
| 357 | hammer_done_cursor(&cursor); |
| 358 | return (ip); |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * Create a new filesystem object, returning the inode in *ipp. The |
| 363 | * returned inode will be referenced. |
| 364 | * |
| 365 | * The inode is created in-memory. |
| 366 | */ |
| 367 | int |
| 368 | hammer_create_inode(hammer_transaction_t trans, struct vattr *vap, |
| 369 | struct ucred *cred, hammer_inode_t dip, |
| 370 | struct hammer_inode **ipp) |
| 371 | { |
| 372 | hammer_mount_t hmp; |
| 373 | hammer_inode_t ip; |
| 374 | uid_t xuid; |
| 375 | |
| 376 | hmp = trans->hmp; |
| 377 | ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO); |
| 378 | ++hammer_count_inodes; |
| 379 | ++hmp->count_inodes; |
| 380 | ip->obj_id = hammer_alloc_objid(trans, dip); |
| 381 | KKASSERT(ip->obj_id != 0); |
| 382 | ip->obj_asof = hmp->asof; |
| 383 | ip->hmp = hmp; |
| 384 | ip->flush_state = HAMMER_FST_IDLE; |
| 385 | ip->flags = HAMMER_INODE_DDIRTY | HAMMER_INODE_ITIMES; |
| 386 | ip->cache[0].ip = ip; |
| 387 | ip->cache[1].ip = ip; |
| 388 | |
| 389 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 390 | RB_INIT(&ip->rec_tree); |
| 391 | TAILQ_INIT(&ip->target_list); |
| 392 | |
| 393 | ip->ino_data.atime = trans->time; |
| 394 | ip->ino_data.mtime = trans->time; |
| 395 | ip->ino_data.size = 0; |
| 396 | ip->ino_data.nlinks = 0; |
| 397 | |
| 398 | /* |
| 399 | * A nohistory designator on the parent directory is inherited by |
| 400 | * the child. |
| 401 | */ |
| 402 | ip->ino_data.uflags = dip->ino_data.uflags & |
| 403 | (SF_NOHISTORY|UF_NOHISTORY|UF_NODUMP); |
| 404 | |
| 405 | ip->ino_leaf.base.btype = HAMMER_BTREE_TYPE_RECORD; |
| 406 | ip->ino_leaf.base.localization = HAMMER_LOCALIZE_INODE; |
| 407 | ip->ino_leaf.base.obj_id = ip->obj_id; |
| 408 | ip->ino_leaf.base.key = 0; |
| 409 | ip->ino_leaf.base.create_tid = 0; |
| 410 | ip->ino_leaf.base.delete_tid = 0; |
| 411 | ip->ino_leaf.base.rec_type = HAMMER_RECTYPE_INODE; |
| 412 | ip->ino_leaf.base.obj_type = hammer_get_obj_type(vap->va_type); |
| 413 | |
| 414 | ip->ino_data.obj_type = ip->ino_leaf.base.obj_type; |
| 415 | ip->ino_data.version = HAMMER_INODE_DATA_VERSION; |
| 416 | ip->ino_data.mode = vap->va_mode; |
| 417 | ip->ino_data.ctime = trans->time; |
| 418 | ip->ino_data.parent_obj_id = (dip) ? dip->ino_leaf.base.obj_id : 0; |
| 419 | |
| 420 | switch(ip->ino_leaf.base.obj_type) { |
| 421 | case HAMMER_OBJTYPE_CDEV: |
| 422 | case HAMMER_OBJTYPE_BDEV: |
| 423 | ip->ino_data.rmajor = vap->va_rmajor; |
| 424 | ip->ino_data.rminor = vap->va_rminor; |
| 425 | break; |
| 426 | default: |
| 427 | break; |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * Calculate default uid/gid and overwrite with information from |
| 432 | * the vap. |
| 433 | */ |
| 434 | xuid = hammer_to_unix_xid(&dip->ino_data.uid); |
| 435 | xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, xuid, cred, |
| 436 | &vap->va_mode); |
| 437 | ip->ino_data.mode = vap->va_mode; |
| 438 | |
| 439 | if (vap->va_vaflags & VA_UID_UUID_VALID) |
| 440 | ip->ino_data.uid = vap->va_uid_uuid; |
| 441 | else if (vap->va_uid != (uid_t)VNOVAL) |
| 442 | hammer_guid_to_uuid(&ip->ino_data.uid, vap->va_uid); |
| 443 | else |
| 444 | hammer_guid_to_uuid(&ip->ino_data.uid, xuid); |
| 445 | |
| 446 | if (vap->va_vaflags & VA_GID_UUID_VALID) |
| 447 | ip->ino_data.gid = vap->va_gid_uuid; |
| 448 | else if (vap->va_gid != (gid_t)VNOVAL) |
| 449 | hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid); |
| 450 | else |
| 451 | ip->ino_data.gid = dip->ino_data.gid; |
| 452 | |
| 453 | hammer_ref(&ip->lock); |
| 454 | if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) { |
| 455 | hammer_unref(&ip->lock); |
| 456 | panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id); |
| 457 | } |
| 458 | *ipp = ip; |
| 459 | return(0); |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Called by hammer_sync_inode(). |
| 464 | */ |
| 465 | static int |
| 466 | hammer_update_inode(hammer_cursor_t cursor, hammer_inode_t ip) |
| 467 | { |
| 468 | hammer_transaction_t trans = cursor->trans; |
| 469 | hammer_record_t record; |
| 470 | int error; |
| 471 | |
| 472 | retry: |
| 473 | error = 0; |
| 474 | |
| 475 | /* |
| 476 | * If the inode has a presence on-disk then locate it and mark |
| 477 | * it deleted, setting DELONDISK. |
| 478 | * |
| 479 | * The record may or may not be physically deleted, depending on |
| 480 | * the retention policy. |
| 481 | */ |
| 482 | if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == |
| 483 | HAMMER_INODE_ONDISK) { |
| 484 | hammer_normalize_cursor(cursor); |
| 485 | cursor->key_beg.localization = HAMMER_LOCALIZE_INODE; |
| 486 | cursor->key_beg.obj_id = ip->obj_id; |
| 487 | cursor->key_beg.key = 0; |
| 488 | cursor->key_beg.create_tid = 0; |
| 489 | cursor->key_beg.delete_tid = 0; |
| 490 | cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 491 | cursor->key_beg.obj_type = 0; |
| 492 | cursor->asof = ip->obj_asof; |
| 493 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 494 | cursor->flags |= HAMMER_CURSOR_GET_LEAF | HAMMER_CURSOR_ASOF; |
| 495 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 496 | |
| 497 | error = hammer_btree_lookup(cursor); |
| 498 | if (hammer_debug_inode) |
| 499 | kprintf("IPDEL %p %08x %d", ip, ip->flags, error); |
| 500 | if (error) { |
| 501 | kprintf("error %d\n", error); |
| 502 | Debugger("hammer_update_inode"); |
| 503 | } |
| 504 | |
| 505 | if (error == 0) { |
| 506 | error = hammer_ip_delete_record(cursor, ip, trans->tid); |
| 507 | if (hammer_debug_inode) |
| 508 | kprintf(" error %d\n", error); |
| 509 | if (error && error != EDEADLK) { |
| 510 | kprintf("error %d\n", error); |
| 511 | Debugger("hammer_update_inode2"); |
| 512 | } |
| 513 | if (error == 0) { |
| 514 | ip->flags |= HAMMER_INODE_DELONDISK; |
| 515 | } |
| 516 | if (cursor->node) |
| 517 | hammer_cache_node(&ip->cache[0], cursor->node); |
| 518 | } |
| 519 | if (error == EDEADLK) { |
| 520 | hammer_done_cursor(cursor); |
| 521 | error = hammer_init_cursor(trans, cursor, |
| 522 | &ip->cache[0], ip); |
| 523 | if (hammer_debug_inode) |
| 524 | kprintf("IPDED %p %d\n", ip, error); |
| 525 | if (error == 0) |
| 526 | goto retry; |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Ok, write out the initial record or a new record (after deleting |
| 532 | * the old one), unless the DELETED flag is set. This routine will |
| 533 | * clear DELONDISK if it writes out a record. |
| 534 | * |
| 535 | * Update our inode statistics if this is the first application of |
| 536 | * the inode on-disk. |
| 537 | */ |
| 538 | if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) { |
| 539 | /* |
| 540 | * Generate a record and write it to the media |
| 541 | */ |
| 542 | record = hammer_alloc_mem_record(ip, 0); |
| 543 | record->type = HAMMER_MEM_RECORD_INODE; |
| 544 | record->flush_state = HAMMER_FST_FLUSH; |
| 545 | record->leaf = ip->sync_ino_leaf; |
| 546 | record->leaf.base.create_tid = trans->tid; |
| 547 | record->leaf.data_len = sizeof(ip->sync_ino_data); |
| 548 | record->data = (void *)&ip->sync_ino_data; |
| 549 | record->flags |= HAMMER_RECF_INTERLOCK_BE; |
| 550 | for (;;) { |
| 551 | error = hammer_ip_sync_record_cursor(cursor, record); |
| 552 | if (hammer_debug_inode) |
| 553 | kprintf("GENREC %p rec %08x %d\n", |
| 554 | ip, record->flags, error); |
| 555 | if (error != EDEADLK) |
| 556 | break; |
| 557 | hammer_done_cursor(cursor); |
| 558 | error = hammer_init_cursor(trans, cursor, |
| 559 | &ip->cache[0], ip); |
| 560 | if (hammer_debug_inode) |
| 561 | kprintf("GENREC reinit %d\n", error); |
| 562 | if (error) |
| 563 | break; |
| 564 | } |
| 565 | if (error) { |
| 566 | kprintf("error %d\n", error); |
| 567 | Debugger("hammer_update_inode3"); |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * The record isn't managed by the inode's record tree, |
| 572 | * destroy it whether we succeed or fail. |
| 573 | */ |
| 574 | record->flags &= ~HAMMER_RECF_INTERLOCK_BE; |
| 575 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 576 | record->flush_state = HAMMER_FST_IDLE; |
| 577 | hammer_rel_mem_record(record); |
| 578 | |
| 579 | /* |
| 580 | * Finish up. |
| 581 | */ |
| 582 | if (error == 0) { |
| 583 | if (hammer_debug_inode) |
| 584 | kprintf("CLEANDELOND %p %08x\n", ip, ip->flags); |
| 585 | ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | |
| 586 | HAMMER_INODE_ITIMES); |
| 587 | ip->flags &= ~HAMMER_INODE_DELONDISK; |
| 588 | |
| 589 | /* |
| 590 | * Root volume count of inodes |
| 591 | */ |
| 592 | if ((ip->flags & HAMMER_INODE_ONDISK) == 0) { |
| 593 | hammer_modify_volume_field(trans, |
| 594 | trans->rootvol, |
| 595 | vol0_stat_inodes); |
| 596 | ++ip->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 597 | hammer_modify_volume_done(trans->rootvol); |
| 598 | ip->flags |= HAMMER_INODE_ONDISK; |
| 599 | if (hammer_debug_inode) |
| 600 | kprintf("NOWONDISK %p\n", ip); |
| 601 | } |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | /* |
| 606 | * If the inode has been destroyed, clean out any left-over flags |
| 607 | * that may have been set by the frontend. |
| 608 | */ |
| 609 | if (error == 0 && (ip->flags & HAMMER_INODE_DELETED)) { |
| 610 | ip->sync_flags &= ~(HAMMER_INODE_DDIRTY | |
| 611 | HAMMER_INODE_ITIMES); |
| 612 | } |
| 613 | return(error); |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * Update only the itimes fields. This is done no-historically. The |
| 618 | * record is updated in-place on the disk. |
| 619 | */ |
| 620 | static int |
| 621 | hammer_update_itimes(hammer_cursor_t cursor, hammer_inode_t ip) |
| 622 | { |
| 623 | hammer_transaction_t trans = cursor->trans; |
| 624 | struct hammer_btree_leaf_elm *leaf; |
| 625 | int error; |
| 626 | |
| 627 | retry: |
| 628 | error = 0; |
| 629 | if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) == |
| 630 | HAMMER_INODE_ONDISK) { |
| 631 | hammer_normalize_cursor(cursor); |
| 632 | cursor->key_beg.localization = HAMMER_LOCALIZE_INODE; |
| 633 | cursor->key_beg.obj_id = ip->obj_id; |
| 634 | cursor->key_beg.key = 0; |
| 635 | cursor->key_beg.create_tid = 0; |
| 636 | cursor->key_beg.delete_tid = 0; |
| 637 | cursor->key_beg.rec_type = HAMMER_RECTYPE_INODE; |
| 638 | cursor->key_beg.obj_type = 0; |
| 639 | cursor->asof = ip->obj_asof; |
| 640 | cursor->flags &= ~HAMMER_CURSOR_INITMASK; |
| 641 | cursor->flags |= HAMMER_CURSOR_ASOF; |
| 642 | cursor->flags |= HAMMER_CURSOR_GET_LEAF; |
| 643 | cursor->flags |= HAMMER_CURSOR_GET_DATA; |
| 644 | cursor->flags |= HAMMER_CURSOR_BACKEND; |
| 645 | |
| 646 | error = hammer_btree_lookup(cursor); |
| 647 | if (error) { |
| 648 | kprintf("error %d\n", error); |
| 649 | Debugger("hammer_update_itimes1"); |
| 650 | } |
| 651 | if (error == 0) { |
| 652 | /* |
| 653 | * atime/mtime updates can be done in place, but |
| 654 | * they are nasty because we also have to update the |
| 655 | * data_crc in the B-Tree leaf, which means we |
| 656 | * ALSO have to generate UNDO records. |
| 657 | */ |
| 658 | hammer_modify_buffer(trans, cursor->data_buffer, |
| 659 | HAMMER_ITIMES_BASE(&cursor->data->inode), |
| 660 | HAMMER_ITIMES_BYTES); |
| 661 | cursor->data->inode.atime = ip->sync_ino_data.atime; |
| 662 | cursor->data->inode.mtime = ip->sync_ino_data.mtime; |
| 663 | hammer_modify_buffer_done(cursor->data_buffer); |
| 664 | |
| 665 | leaf = cursor->leaf; |
| 666 | hammer_modify_node(trans, cursor->node, |
| 667 | &leaf->data_crc, |
| 668 | sizeof(leaf->data_crc)); |
| 669 | leaf->data_crc = crc32(cursor->data, leaf->data_len); |
| 670 | hammer_modify_node_done(cursor->node); |
| 671 | |
| 672 | ip->sync_flags &= ~HAMMER_INODE_ITIMES; |
| 673 | /* XXX recalculate crc */ |
| 674 | hammer_cache_node(&ip->cache[0], cursor->node); |
| 675 | } |
| 676 | if (error == EDEADLK) { |
| 677 | hammer_done_cursor(cursor); |
| 678 | error = hammer_init_cursor(trans, cursor, |
| 679 | &ip->cache[0], ip); |
| 680 | if (error == 0) |
| 681 | goto retry; |
| 682 | } |
| 683 | } |
| 684 | return(error); |
| 685 | } |
| 686 | |
| 687 | /* |
| 688 | * Release a reference on an inode, flush as requested. |
| 689 | * |
| 690 | * On the last reference we queue the inode to the flusher for its final |
| 691 | * disposition. |
| 692 | */ |
| 693 | void |
| 694 | hammer_rel_inode(struct hammer_inode *ip, int flush) |
| 695 | { |
| 696 | hammer_mount_t hmp = ip->hmp; |
| 697 | |
| 698 | /* |
| 699 | * Handle disposition when dropping the last ref. |
| 700 | */ |
| 701 | for (;;) { |
| 702 | if (ip->lock.refs == 1) { |
| 703 | /* |
| 704 | * Determine whether on-disk action is needed for |
| 705 | * the inode's final disposition. |
| 706 | */ |
| 707 | KKASSERT(ip->vp == NULL); |
| 708 | hammer_inode_unloadable_check(ip, 0); |
| 709 | if (ip->flags & HAMMER_INODE_MODMASK) { |
| 710 | if (hmp->rsv_inodes > desiredvnodes) { |
| 711 | hammer_flush_inode(ip, |
| 712 | HAMMER_FLUSH_SIGNAL); |
| 713 | } else { |
| 714 | hammer_flush_inode(ip, 0); |
| 715 | } |
| 716 | } else if (ip->lock.refs == 1) { |
| 717 | hammer_unload_inode(ip); |
| 718 | break; |
| 719 | } |
| 720 | } else { |
| 721 | if (flush) |
| 722 | hammer_flush_inode(ip, 0); |
| 723 | |
| 724 | /* |
| 725 | * The inode still has multiple refs, try to drop |
| 726 | * one ref. |
| 727 | */ |
| 728 | KKASSERT(ip->lock.refs >= 1); |
| 729 | if (ip->lock.refs > 1) { |
| 730 | hammer_unref(&ip->lock); |
| 731 | break; |
| 732 | } |
| 733 | } |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Unload and destroy the specified inode. Must be called with one remaining |
| 739 | * reference. The reference is disposed of. |
| 740 | * |
| 741 | * This can only be called in the context of the flusher. |
| 742 | */ |
| 743 | static int |
| 744 | hammer_unload_inode(struct hammer_inode *ip) |
| 745 | { |
| 746 | hammer_mount_t hmp = ip->hmp; |
| 747 | |
| 748 | KASSERT(ip->lock.refs == 1, |
| 749 | ("hammer_unload_inode: %d refs\n", ip->lock.refs)); |
| 750 | KKASSERT(ip->vp == NULL); |
| 751 | KKASSERT(ip->flush_state == HAMMER_FST_IDLE); |
| 752 | KKASSERT(ip->cursor_ip_refs == 0); |
| 753 | KKASSERT(ip->lock.lockcount == 0); |
| 754 | KKASSERT((ip->flags & HAMMER_INODE_MODMASK) == 0); |
| 755 | |
| 756 | KKASSERT(RB_EMPTY(&ip->rec_tree)); |
| 757 | KKASSERT(TAILQ_EMPTY(&ip->target_list)); |
| 758 | |
| 759 | RB_REMOVE(hammer_ino_rb_tree, &hmp->rb_inos_root, ip); |
| 760 | |
| 761 | hammer_uncache_node(&ip->cache[0]); |
| 762 | hammer_uncache_node(&ip->cache[1]); |
| 763 | if (ip->objid_cache) |
| 764 | hammer_clear_objid(ip); |
| 765 | --hammer_count_inodes; |
| 766 | --hmp->count_inodes; |
| 767 | |
| 768 | hammer_inode_wakereclaims(ip); |
| 769 | kfree(ip, M_HAMMER); |
| 770 | |
| 771 | return(0); |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Called on mount -u when switching from RW to RO or vise-versa. Adjust |
| 776 | * the read-only flag for cached inodes. |
| 777 | * |
| 778 | * This routine is called from a RB_SCAN(). |
| 779 | */ |
| 780 | int |
| 781 | hammer_reload_inode(hammer_inode_t ip, void *arg __unused) |
| 782 | { |
| 783 | hammer_mount_t hmp = ip->hmp; |
| 784 | |
| 785 | if (hmp->ronly || hmp->asof != HAMMER_MAX_TID) |
| 786 | ip->flags |= HAMMER_INODE_RO; |
| 787 | else |
| 788 | ip->flags &= ~HAMMER_INODE_RO; |
| 789 | return(0); |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * A transaction has modified an inode, requiring updates as specified by |
| 794 | * the passed flags. |
| 795 | * |
| 796 | * HAMMER_INODE_DDIRTY: Inode data has been updated |
| 797 | * HAMMER_INODE_XDIRTY: Dirty in-memory records |
| 798 | * HAMMER_INODE_BUFS: Dirty buffer cache buffers |
| 799 | * HAMMER_INODE_DELETED: Inode record/data must be deleted |
| 800 | * HAMMER_INODE_ITIMES: mtime/atime has been updated |
| 801 | */ |
| 802 | void |
| 803 | hammer_modify_inode(hammer_inode_t ip, int flags) |
| 804 | { |
| 805 | KKASSERT ((ip->flags & HAMMER_INODE_RO) == 0 || |
| 806 | (flags & (HAMMER_INODE_DDIRTY | |
| 807 | HAMMER_INODE_XDIRTY | HAMMER_INODE_BUFS | |
| 808 | HAMMER_INODE_DELETED | HAMMER_INODE_ITIMES)) == 0); |
| 809 | if ((ip->flags & HAMMER_INODE_RSV_INODES) == 0) { |
| 810 | ip->flags |= HAMMER_INODE_RSV_INODES; |
| 811 | ++ip->hmp->rsv_inodes; |
| 812 | } |
| 813 | |
| 814 | ip->flags |= flags; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Request that an inode be flushed. This whole mess cannot block and may |
| 819 | * recurse (if not synchronous). Once requested HAMMER will attempt to |
| 820 | * actively flush the inode until the flush can be done. |
| 821 | * |
| 822 | * The inode may already be flushing, or may be in a setup state. We can |
| 823 | * place the inode in a flushing state if it is currently idle and flag it |
| 824 | * to reflush if it is currently flushing. |
| 825 | * |
| 826 | * If the HAMMER_FLUSH_SYNCHRONOUS flag is specified we will attempt to |
| 827 | * flush the indoe synchronously using the caller's context. |
| 828 | */ |
| 829 | void |
| 830 | hammer_flush_inode(hammer_inode_t ip, int flags) |
| 831 | { |
| 832 | int good; |
| 833 | |
| 834 | /* |
| 835 | * Trivial 'nothing to flush' case. If the inode is ina SETUP |
| 836 | * state we have to put it back into an IDLE state so we can |
| 837 | * drop the extra ref. |
| 838 | */ |
| 839 | if ((ip->flags & HAMMER_INODE_MODMASK) == 0) { |
| 840 | if (ip->flush_state == HAMMER_FST_SETUP) { |
| 841 | ip->flush_state = HAMMER_FST_IDLE; |
| 842 | hammer_rel_inode(ip, 0); |
| 843 | } |
| 844 | return; |
| 845 | } |
| 846 | |
| 847 | /* |
| 848 | * Our flush action will depend on the current state. |
| 849 | */ |
| 850 | switch(ip->flush_state) { |
| 851 | case HAMMER_FST_IDLE: |
| 852 | /* |
| 853 | * We have no dependancies and can flush immediately. Some |
| 854 | * our children may not be flushable so we have to re-test |
| 855 | * with that additional knowledge. |
| 856 | */ |
| 857 | hammer_flush_inode_core(ip, flags); |
| 858 | break; |
| 859 | case HAMMER_FST_SETUP: |
| 860 | /* |
| 861 | * Recurse upwards through dependancies via target_list |
| 862 | * and start their flusher actions going if possible. |
| 863 | * |
| 864 | * 'good' is our connectivity. -1 means we have none and |
| 865 | * can't flush, 0 means there weren't any dependancies, and |
| 866 | * 1 means we have good connectivity. |
| 867 | */ |
| 868 | good = hammer_setup_parent_inodes(ip); |
| 869 | |
| 870 | /* |
| 871 | * We can continue if good >= 0. Determine how many records |
| 872 | * under our inode can be flushed (and mark them). |
| 873 | */ |
| 874 | if (good >= 0) { |
| 875 | hammer_flush_inode_core(ip, flags); |
| 876 | } else { |
| 877 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 878 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 879 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 880 | hammer_flusher_async(ip->hmp); |
| 881 | } |
| 882 | } |
| 883 | break; |
| 884 | default: |
| 885 | /* |
| 886 | * We are already flushing, flag the inode to reflush |
| 887 | * if needed after it completes its current flush. |
| 888 | */ |
| 889 | if ((ip->flags & HAMMER_INODE_REFLUSH) == 0) |
| 890 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 891 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 892 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 893 | hammer_flusher_async(ip->hmp); |
| 894 | } |
| 895 | break; |
| 896 | } |
| 897 | } |
| 898 | |
| 899 | /* |
| 900 | * Scan ip->target_list, which is a list of records owned by PARENTS to our |
| 901 | * ip which reference our ip. |
| 902 | * |
| 903 | * XXX This is a huge mess of recursive code, but not one bit of it blocks |
| 904 | * so for now do not ref/deref the structures. Note that if we use the |
| 905 | * ref/rel code later, the rel CAN block. |
| 906 | */ |
| 907 | static int |
| 908 | hammer_setup_parent_inodes(hammer_inode_t ip) |
| 909 | { |
| 910 | hammer_record_t depend; |
| 911 | #if 0 |
| 912 | hammer_record_t next; |
| 913 | hammer_inode_t pip; |
| 914 | #endif |
| 915 | int good; |
| 916 | int r; |
| 917 | |
| 918 | good = 0; |
| 919 | TAILQ_FOREACH(depend, &ip->target_list, target_entry) { |
| 920 | r = hammer_setup_parent_inodes_helper(depend); |
| 921 | KKASSERT(depend->target_ip == ip); |
| 922 | if (r < 0 && good == 0) |
| 923 | good = -1; |
| 924 | if (r > 0) |
| 925 | good = 1; |
| 926 | } |
| 927 | return(good); |
| 928 | |
| 929 | #if 0 |
| 930 | retry: |
| 931 | good = 0; |
| 932 | next = TAILQ_FIRST(&ip->target_list); |
| 933 | if (next) { |
| 934 | hammer_ref(&next->lock); |
| 935 | hammer_ref(&next->ip->lock); |
| 936 | } |
| 937 | while ((depend = next) != NULL) { |
| 938 | if (depend->target_ip == NULL) { |
| 939 | pip = depend->ip; |
| 940 | hammer_rel_mem_record(depend); |
| 941 | hammer_rel_inode(pip, 0); |
| 942 | goto retry; |
| 943 | } |
| 944 | KKASSERT(depend->target_ip == ip); |
| 945 | next = TAILQ_NEXT(depend, target_entry); |
| 946 | if (next) { |
| 947 | hammer_ref(&next->lock); |
| 948 | hammer_ref(&next->ip->lock); |
| 949 | } |
| 950 | r = hammer_setup_parent_inodes_helper(depend); |
| 951 | if (r < 0 && good == 0) |
| 952 | good = -1; |
| 953 | if (r > 0) |
| 954 | good = 1; |
| 955 | pip = depend->ip; |
| 956 | hammer_rel_mem_record(depend); |
| 957 | hammer_rel_inode(pip, 0); |
| 958 | } |
| 959 | return(good); |
| 960 | #endif |
| 961 | } |
| 962 | |
| 963 | /* |
| 964 | * This helper function takes a record representing the dependancy between |
| 965 | * the parent inode and child inode. |
| 966 | * |
| 967 | * record->ip = parent inode |
| 968 | * record->target_ip = child inode |
| 969 | * |
| 970 | * We are asked to recurse upwards and convert the record from SETUP |
| 971 | * to FLUSH if possible. |
| 972 | * |
| 973 | * Return 1 if the record gives us connectivity |
| 974 | * |
| 975 | * Return 0 if the record is not relevant |
| 976 | * |
| 977 | * Return -1 if we can't resolve the dependancy and there is no connectivity. |
| 978 | */ |
| 979 | static int |
| 980 | hammer_setup_parent_inodes_helper(hammer_record_t record) |
| 981 | { |
| 982 | hammer_mount_t hmp; |
| 983 | hammer_inode_t pip; |
| 984 | int good; |
| 985 | |
| 986 | KKASSERT(record->flush_state != HAMMER_FST_IDLE); |
| 987 | pip = record->ip; |
| 988 | hmp = pip->hmp; |
| 989 | |
| 990 | /* |
| 991 | * If the record is already flushing, is it in our flush group? |
| 992 | * |
| 993 | * If it is in our flush group but it is a general record or a |
| 994 | * delete-on-disk, it does not improve our connectivity (return 0), |
| 995 | * and if the target inode is not trying to destroy itself we can't |
| 996 | * allow the operation yet anyway (the second return -1). |
| 997 | */ |
| 998 | if (record->flush_state == HAMMER_FST_FLUSH) { |
| 999 | if (record->flush_group != hmp->flusher.next) { |
| 1000 | pip->flags |= HAMMER_INODE_REFLUSH; |
| 1001 | return(-1); |
| 1002 | } |
| 1003 | if (record->type == HAMMER_MEM_RECORD_ADD) |
| 1004 | return(1); |
| 1005 | /* GENERAL or DEL */ |
| 1006 | return(0); |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * It must be a setup record. Try to resolve the setup dependancies |
| 1011 | * by recursing upwards so we can place ip on the flush list. |
| 1012 | */ |
| 1013 | KKASSERT(record->flush_state == HAMMER_FST_SETUP); |
| 1014 | |
| 1015 | good = hammer_setup_parent_inodes(pip); |
| 1016 | |
| 1017 | /* |
| 1018 | * We can't flush ip because it has no connectivity (XXX also check |
| 1019 | * nlinks for pre-existing connectivity!). Flag it so any resolution |
| 1020 | * recurses back down. |
| 1021 | */ |
| 1022 | if (good < 0) { |
| 1023 | pip->flags |= HAMMER_INODE_REFLUSH; |
| 1024 | return(good); |
| 1025 | } |
| 1026 | |
| 1027 | /* |
| 1028 | * We are go, place the parent inode in a flushing state so we can |
| 1029 | * place its record in a flushing state. Note that the parent |
| 1030 | * may already be flushing. The record must be in the same flush |
| 1031 | * group as the parent. |
| 1032 | */ |
| 1033 | if (pip->flush_state != HAMMER_FST_FLUSH) |
| 1034 | hammer_flush_inode_core(pip, HAMMER_FLUSH_RECURSION); |
| 1035 | KKASSERT(pip->flush_state == HAMMER_FST_FLUSH); |
| 1036 | KKASSERT(record->flush_state == HAMMER_FST_SETUP); |
| 1037 | |
| 1038 | #if 0 |
| 1039 | if (record->type == HAMMER_MEM_RECORD_DEL && |
| 1040 | (record->target_ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_DELONDISK)) == 0) { |
| 1041 | /* |
| 1042 | * Regardless of flushing state we cannot sync this path if the |
| 1043 | * record represents a delete-on-disk but the target inode |
| 1044 | * is not ready to sync its own deletion. |
| 1045 | * |
| 1046 | * XXX need to count effective nlinks to determine whether |
| 1047 | * the flush is ok, otherwise removing a hardlink will |
| 1048 | * just leave the DEL record to rot. |
| 1049 | */ |
| 1050 | record->target_ip->flags |= HAMMER_INODE_REFLUSH; |
| 1051 | return(-1); |
| 1052 | } else |
| 1053 | #endif |
| 1054 | if (pip->flush_group == pip->hmp->flusher.next) { |
| 1055 | /* |
| 1056 | * This is the record we wanted to synchronize. If the |
| 1057 | * record went into a flush state while we blocked it |
| 1058 | * had better be in the correct flush group. |
| 1059 | */ |
| 1060 | if (record->flush_state != HAMMER_FST_FLUSH) { |
| 1061 | record->flush_state = HAMMER_FST_FLUSH; |
| 1062 | record->flush_group = pip->flush_group; |
| 1063 | hammer_ref(&record->lock); |
| 1064 | } else { |
| 1065 | KKASSERT(record->flush_group == pip->flush_group); |
| 1066 | } |
| 1067 | if (record->type == HAMMER_MEM_RECORD_ADD) |
| 1068 | return(1); |
| 1069 | |
| 1070 | /* |
| 1071 | * A general or delete-on-disk record does not contribute |
| 1072 | * to our visibility. We can still flush it, however. |
| 1073 | */ |
| 1074 | return(0); |
| 1075 | } else { |
| 1076 | /* |
| 1077 | * We couldn't resolve the dependancies, request that the |
| 1078 | * inode be flushed when the dependancies can be resolved. |
| 1079 | */ |
| 1080 | pip->flags |= HAMMER_INODE_REFLUSH; |
| 1081 | return(-1); |
| 1082 | } |
| 1083 | } |
| 1084 | |
| 1085 | /* |
| 1086 | * This is the core routine placing an inode into the FST_FLUSH state. |
| 1087 | */ |
| 1088 | static void |
| 1089 | hammer_flush_inode_core(hammer_inode_t ip, int flags) |
| 1090 | { |
| 1091 | int go_count; |
| 1092 | |
| 1093 | /* |
| 1094 | * Set flush state and prevent the flusher from cycling into |
| 1095 | * the next flush group. Do not place the ip on the list yet. |
| 1096 | * Inodes not in the idle state get an extra reference. |
| 1097 | */ |
| 1098 | KKASSERT(ip->flush_state != HAMMER_FST_FLUSH); |
| 1099 | if (ip->flush_state == HAMMER_FST_IDLE) |
| 1100 | hammer_ref(&ip->lock); |
| 1101 | ip->flush_state = HAMMER_FST_FLUSH; |
| 1102 | ip->flush_group = ip->hmp->flusher.next; |
| 1103 | ++ip->hmp->flusher.group_lock; |
| 1104 | ++ip->hmp->count_iqueued; |
| 1105 | ++hammer_count_iqueued; |
| 1106 | |
| 1107 | /* |
| 1108 | * We need to be able to vfsync/truncate from the backend. |
| 1109 | */ |
| 1110 | KKASSERT((ip->flags & HAMMER_INODE_VHELD) == 0); |
| 1111 | if (ip->vp && (ip->vp->v_flag & VINACTIVE) == 0) { |
| 1112 | ip->flags |= HAMMER_INODE_VHELD; |
| 1113 | vref(ip->vp); |
| 1114 | } |
| 1115 | |
| 1116 | /* |
| 1117 | * Figure out how many in-memory records we can actually flush |
| 1118 | * (not including inode meta-data, buffers, etc). |
| 1119 | */ |
| 1120 | if (flags & HAMMER_FLUSH_RECURSION) { |
| 1121 | go_count = 1; |
| 1122 | } else { |
| 1123 | go_count = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, |
| 1124 | hammer_setup_child_callback, NULL); |
| 1125 | } |
| 1126 | |
| 1127 | /* |
| 1128 | * This is a more involved test that includes go_count. If we |
| 1129 | * can't flush, flag the inode and return. If go_count is 0 we |
| 1130 | * were are unable to flush any records in our rec_tree and |
| 1131 | * must ignore the XDIRTY flag. |
| 1132 | */ |
| 1133 | if (go_count == 0) { |
| 1134 | if ((ip->flags & HAMMER_INODE_MODMASK_NOXDIRTY) == 0) { |
| 1135 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 1136 | |
| 1137 | --ip->hmp->count_iqueued; |
| 1138 | --hammer_count_iqueued; |
| 1139 | |
| 1140 | ip->flush_state = HAMMER_FST_SETUP; |
| 1141 | if (ip->flags & HAMMER_INODE_VHELD) { |
| 1142 | ip->flags &= ~HAMMER_INODE_VHELD; |
| 1143 | vrele(ip->vp); |
| 1144 | } |
| 1145 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 1146 | ip->flags |= HAMMER_INODE_RESIGNAL; |
| 1147 | hammer_flusher_async(ip->hmp); |
| 1148 | } |
| 1149 | if (--ip->hmp->flusher.group_lock == 0) |
| 1150 | wakeup(&ip->hmp->flusher.group_lock); |
| 1151 | return; |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * Snapshot the state of the inode for the backend flusher. |
| 1157 | * |
| 1158 | * The truncation must be retained in the frontend until after |
| 1159 | * we've actually performed the record deletion. |
| 1160 | * |
| 1161 | * We continue to retain sync_trunc_off even when all truncations |
| 1162 | * have been resolved as an optimization to determine if we can |
| 1163 | * skip the B-Tree lookup for overwrite deletions. |
| 1164 | * |
| 1165 | * NOTE: The DELETING flag is a mod flag, but it is also sticky, |
| 1166 | * and stays in ip->flags. Once set, it stays set until the |
| 1167 | * inode is destroyed. |
| 1168 | */ |
| 1169 | ip->sync_flags = (ip->flags & HAMMER_INODE_MODMASK); |
| 1170 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) |
| 1171 | ip->sync_trunc_off = ip->trunc_off; |
| 1172 | ip->sync_ino_leaf = ip->ino_leaf; |
| 1173 | ip->sync_ino_data = ip->ino_data; |
| 1174 | ip->trunc_off = 0x7FFFFFFFFFFFFFFFLL; |
| 1175 | ip->flags &= ~HAMMER_INODE_MODMASK; |
| 1176 | #ifdef DEBUG_TRUNCATE |
| 1177 | if ((ip->sync_flags & HAMMER_INODE_TRUNCATED) && ip == HammerTruncIp) |
| 1178 | kprintf("truncateS %016llx\n", ip->sync_trunc_off); |
| 1179 | #endif |
| 1180 | |
| 1181 | /* |
| 1182 | * The flusher list inherits our inode and reference. |
| 1183 | */ |
| 1184 | TAILQ_INSERT_TAIL(&ip->hmp->flush_list, ip, flush_entry); |
| 1185 | if (--ip->hmp->flusher.group_lock == 0) |
| 1186 | wakeup(&ip->hmp->flusher.group_lock); |
| 1187 | |
| 1188 | if (flags & HAMMER_FLUSH_SIGNAL) { |
| 1189 | hammer_flusher_async(ip->hmp); |
| 1190 | } |
| 1191 | } |
| 1192 | |
| 1193 | /* |
| 1194 | * Callback for scan of ip->rec_tree. Try to include each record in our |
| 1195 | * flush. ip->flush_group has been set but the inode has not yet been |
| 1196 | * moved into a flushing state. |
| 1197 | * |
| 1198 | * If we get stuck on a record we have to set HAMMER_INODE_REFLUSH on |
| 1199 | * both inodes. |
| 1200 | * |
| 1201 | * We return 1 for any record placed or found in FST_FLUSH, which prevents |
| 1202 | * the caller from shortcutting the flush. |
| 1203 | */ |
| 1204 | static int |
| 1205 | hammer_setup_child_callback(hammer_record_t rec, void *data) |
| 1206 | { |
| 1207 | hammer_inode_t target_ip; |
| 1208 | hammer_inode_t ip; |
| 1209 | int r; |
| 1210 | |
| 1211 | /* |
| 1212 | * Deleted records are ignored. Note that the flush detects deleted |
| 1213 | * front-end records at multiple points to deal with races. This is |
| 1214 | * just the first line of defense. The only time DELETED_FE cannot |
| 1215 | * be set is when HAMMER_RECF_INTERLOCK_BE is set. |
| 1216 | * |
| 1217 | * Don't get confused between record deletion and, say, directory |
| 1218 | * entry deletion. The deletion of a directory entry that is on |
| 1219 | * the media has nothing to do with the record deletion flags. |
| 1220 | */ |
| 1221 | if (rec->flags & (HAMMER_RECF_DELETED_FE|HAMMER_RECF_DELETED_BE)) |
| 1222 | return(0); |
| 1223 | |
| 1224 | /* |
| 1225 | * If the record is in an idle state it has no dependancies and |
| 1226 | * can be flushed. |
| 1227 | */ |
| 1228 | ip = rec->ip; |
| 1229 | r = 0; |
| 1230 | |
| 1231 | switch(rec->flush_state) { |
| 1232 | case HAMMER_FST_IDLE: |
| 1233 | /* |
| 1234 | * Record has no setup dependancy, we can flush it. |
| 1235 | */ |
| 1236 | KKASSERT(rec->target_ip == NULL); |
| 1237 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1238 | rec->flush_group = ip->flush_group; |
| 1239 | hammer_ref(&rec->lock); |
| 1240 | r = 1; |
| 1241 | break; |
| 1242 | case HAMMER_FST_SETUP: |
| 1243 | /* |
| 1244 | * Record has a setup dependancy. Try to include the |
| 1245 | * target ip in the flush. |
| 1246 | * |
| 1247 | * We have to be careful here, if we do not do the right |
| 1248 | * thing we can lose track of dirty inodes and the system |
| 1249 | * will lockup trying to allocate buffers. |
| 1250 | */ |
| 1251 | target_ip = rec->target_ip; |
| 1252 | KKASSERT(target_ip != NULL); |
| 1253 | KKASSERT(target_ip->flush_state != HAMMER_FST_IDLE); |
| 1254 | if (target_ip->flush_state == HAMMER_FST_FLUSH) { |
| 1255 | /* |
| 1256 | * If the target IP is already flushing in our group |
| 1257 | * we are golden, otherwise make sure the target |
| 1258 | * reflushes. |
| 1259 | */ |
| 1260 | if (target_ip->flush_group == ip->flush_group) { |
| 1261 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1262 | rec->flush_group = ip->flush_group; |
| 1263 | hammer_ref(&rec->lock); |
| 1264 | r = 1; |
| 1265 | } else { |
| 1266 | target_ip->flags |= HAMMER_INODE_REFLUSH; |
| 1267 | } |
| 1268 | } else if (rec->type == HAMMER_MEM_RECORD_ADD) { |
| 1269 | /* |
| 1270 | * If the target IP is not flushing we can force |
| 1271 | * it to flush, even if it is unable to write out |
| 1272 | * any of its own records we have at least one in |
| 1273 | * hand that we CAN deal with. |
| 1274 | */ |
| 1275 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1276 | rec->flush_group = ip->flush_group; |
| 1277 | hammer_ref(&rec->lock); |
| 1278 | hammer_flush_inode_core(target_ip, |
| 1279 | HAMMER_FLUSH_RECURSION); |
| 1280 | r = 1; |
| 1281 | } else { |
| 1282 | /* |
| 1283 | * General or delete-on-disk record. |
| 1284 | * |
| 1285 | * XXX this needs help. If a delete-on-disk we could |
| 1286 | * disconnect the target. If the target has its own |
| 1287 | * dependancies they really need to be flushed. |
| 1288 | * |
| 1289 | * XXX |
| 1290 | */ |
| 1291 | rec->flush_state = HAMMER_FST_FLUSH; |
| 1292 | rec->flush_group = ip->flush_group; |
| 1293 | hammer_ref(&rec->lock); |
| 1294 | hammer_flush_inode_core(target_ip, |
| 1295 | HAMMER_FLUSH_RECURSION); |
| 1296 | r = 1; |
| 1297 | } |
| 1298 | break; |
| 1299 | case HAMMER_FST_FLUSH: |
| 1300 | /* |
| 1301 | * Record already associated with a flush group. It had |
| 1302 | * better be ours. |
| 1303 | */ |
| 1304 | KKASSERT(rec->flush_group == ip->flush_group); |
| 1305 | r = 1; |
| 1306 | break; |
| 1307 | } |
| 1308 | return(r); |
| 1309 | } |
| 1310 | |
| 1311 | /* |
| 1312 | * Wait for a previously queued flush to complete |
| 1313 | */ |
| 1314 | void |
| 1315 | hammer_wait_inode(hammer_inode_t ip) |
| 1316 | { |
| 1317 | while (ip->flush_state != HAMMER_FST_IDLE) { |
| 1318 | if (ip->flush_state == HAMMER_FST_SETUP) { |
| 1319 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1320 | } else { |
| 1321 | ip->flags |= HAMMER_INODE_FLUSHW; |
| 1322 | tsleep(&ip->flags, 0, "hmrwin", 0); |
| 1323 | } |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | /* |
| 1328 | * Called by the backend code when a flush has been completed. |
| 1329 | * The inode has already been removed from the flush list. |
| 1330 | * |
| 1331 | * A pipelined flush can occur, in which case we must re-enter the |
| 1332 | * inode on the list and re-copy its fields. |
| 1333 | */ |
| 1334 | void |
| 1335 | hammer_flush_inode_done(hammer_inode_t ip) |
| 1336 | { |
| 1337 | hammer_mount_t hmp; |
| 1338 | int dorel; |
| 1339 | |
| 1340 | KKASSERT(ip->flush_state == HAMMER_FST_FLUSH); |
| 1341 | |
| 1342 | hmp = ip->hmp; |
| 1343 | |
| 1344 | /* |
| 1345 | * Merge left-over flags back into the frontend and fix the state. |
| 1346 | */ |
| 1347 | ip->flags |= ip->sync_flags; |
| 1348 | |
| 1349 | /* |
| 1350 | * The backend may have adjusted nlinks, so if the adjusted nlinks |
| 1351 | * does not match the fronttend set the frontend's RDIRTY flag again. |
| 1352 | */ |
| 1353 | if (ip->ino_data.nlinks != ip->sync_ino_data.nlinks) |
| 1354 | ip->flags |= HAMMER_INODE_DDIRTY; |
| 1355 | |
| 1356 | /* |
| 1357 | * Fix up the dirty buffer status. IO completions will also |
| 1358 | * try to clean up rsv_databufs. |
| 1359 | */ |
| 1360 | if (ip->vp && RB_ROOT(&ip->vp->v_rbdirty_tree)) { |
| 1361 | ip->flags |= HAMMER_INODE_BUFS; |
| 1362 | } else { |
| 1363 | hmp->rsv_databufs -= ip->rsv_databufs; |
| 1364 | ip->rsv_databufs = 0; |
| 1365 | } |
| 1366 | |
| 1367 | /* |
| 1368 | * Re-set the XDIRTY flag if some of the inode's in-memory records |
| 1369 | * could not be flushed. |
| 1370 | */ |
| 1371 | KKASSERT((RB_EMPTY(&ip->rec_tree) && |
| 1372 | (ip->flags & HAMMER_INODE_XDIRTY) == 0) || |
| 1373 | (!RB_EMPTY(&ip->rec_tree) && |
| 1374 | (ip->flags & HAMMER_INODE_XDIRTY) != 0)); |
| 1375 | |
| 1376 | /* |
| 1377 | * Do not lose track of inodes which no longer have vnode |
| 1378 | * assocations, otherwise they may never get flushed again. |
| 1379 | */ |
| 1380 | if ((ip->flags & HAMMER_INODE_MODMASK) && ip->vp == NULL) |
| 1381 | ip->flags |= HAMMER_INODE_REFLUSH; |
| 1382 | |
| 1383 | /* |
| 1384 | * Adjust flush_state. The target state (idle or setup) shouldn't |
| 1385 | * be terribly important since we will reflush if we really need |
| 1386 | * to do anything. XXX |
| 1387 | */ |
| 1388 | if (TAILQ_EMPTY(&ip->target_list) && RB_EMPTY(&ip->rec_tree)) { |
| 1389 | ip->flush_state = HAMMER_FST_IDLE; |
| 1390 | dorel = 1; |
| 1391 | } else { |
| 1392 | ip->flush_state = HAMMER_FST_SETUP; |
| 1393 | dorel = 0; |
| 1394 | } |
| 1395 | |
| 1396 | --hmp->count_iqueued; |
| 1397 | --hammer_count_iqueued; |
| 1398 | |
| 1399 | /* |
| 1400 | * Clean up the vnode ref |
| 1401 | */ |
| 1402 | if (ip->flags & HAMMER_INODE_VHELD) { |
| 1403 | ip->flags &= ~HAMMER_INODE_VHELD; |
| 1404 | vrele(ip->vp); |
| 1405 | } |
| 1406 | |
| 1407 | /* |
| 1408 | * If the frontend made more changes and requested another flush, |
| 1409 | * then try to get it running. |
| 1410 | */ |
| 1411 | if (ip->flags & HAMMER_INODE_REFLUSH) { |
| 1412 | ip->flags &= ~HAMMER_INODE_REFLUSH; |
| 1413 | if (ip->flags & HAMMER_INODE_RESIGNAL) { |
| 1414 | ip->flags &= ~HAMMER_INODE_RESIGNAL; |
| 1415 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1416 | } else { |
| 1417 | hammer_flush_inode(ip, 0); |
| 1418 | } |
| 1419 | } |
| 1420 | |
| 1421 | /* |
| 1422 | * If the inode is now clean drop the space reservation. |
| 1423 | */ |
| 1424 | if ((ip->flags & HAMMER_INODE_MODMASK) == 0 && |
| 1425 | (ip->flags & HAMMER_INODE_RSV_INODES)) { |
| 1426 | ip->flags &= ~HAMMER_INODE_RSV_INODES; |
| 1427 | --hmp->rsv_inodes; |
| 1428 | } |
| 1429 | |
| 1430 | /* |
| 1431 | * Finally, if the frontend is waiting for a flush to complete, |
| 1432 | * wake it up. |
| 1433 | */ |
| 1434 | if (ip->flush_state != HAMMER_FST_FLUSH) { |
| 1435 | if (ip->flags & HAMMER_INODE_FLUSHW) { |
| 1436 | ip->flags &= ~HAMMER_INODE_FLUSHW; |
| 1437 | wakeup(&ip->flags); |
| 1438 | } |
| 1439 | } |
| 1440 | if (dorel) |
| 1441 | hammer_rel_inode(ip, 0); |
| 1442 | } |
| 1443 | |
| 1444 | /* |
| 1445 | * Called from hammer_sync_inode() to synchronize in-memory records |
| 1446 | * to the media. |
| 1447 | */ |
| 1448 | static int |
| 1449 | hammer_sync_record_callback(hammer_record_t record, void *data) |
| 1450 | { |
| 1451 | hammer_cursor_t cursor = data; |
| 1452 | hammer_transaction_t trans = cursor->trans; |
| 1453 | int error; |
| 1454 | |
| 1455 | /* |
| 1456 | * Skip records that do not belong to the current flush. |
| 1457 | */ |
| 1458 | ++hammer_stats_record_iterations; |
| 1459 | if (record->flush_state != HAMMER_FST_FLUSH) |
| 1460 | return(0); |
| 1461 | |
| 1462 | #if 1 |
| 1463 | if (record->flush_group != record->ip->flush_group) { |
| 1464 | kprintf("sync_record %p ip %p bad flush group %d %d\n", record, record->ip, record->flush_group ,record->ip->flush_group); |
| 1465 | Debugger("blah2"); |
| 1466 | return(0); |
| 1467 | } |
| 1468 | #endif |
| 1469 | KKASSERT(record->flush_group == record->ip->flush_group); |
| 1470 | |
| 1471 | /* |
| 1472 | * Interlock the record using the BE flag. Once BE is set the |
| 1473 | * frontend cannot change the state of FE. |
| 1474 | * |
| 1475 | * NOTE: If FE is set prior to us setting BE we still sync the |
| 1476 | * record out, but the flush completion code converts it to |
| 1477 | * a delete-on-disk record instead of destroying it. |
| 1478 | */ |
| 1479 | KKASSERT((record->flags & HAMMER_RECF_INTERLOCK_BE) == 0); |
| 1480 | record->flags |= HAMMER_RECF_INTERLOCK_BE; |
| 1481 | |
| 1482 | /* |
| 1483 | * The backend may have already disposed of the record. |
| 1484 | */ |
| 1485 | if (record->flags & HAMMER_RECF_DELETED_BE) { |
| 1486 | error = 0; |
| 1487 | goto done; |
| 1488 | } |
| 1489 | |
| 1490 | /* |
| 1491 | * If the whole inode is being deleting all on-disk records will |
| 1492 | * be deleted very soon, we can't sync any new records to disk |
| 1493 | * because they will be deleted in the same transaction they were |
| 1494 | * created in (delete_tid == create_tid), which will assert. |
| 1495 | * |
| 1496 | * XXX There may be a case with RECORD_ADD with DELETED_FE set |
| 1497 | * that we currently panic on. |
| 1498 | */ |
| 1499 | if (record->ip->sync_flags & HAMMER_INODE_DELETING) { |
| 1500 | switch(record->type) { |
| 1501 | case HAMMER_MEM_RECORD_DATA: |
| 1502 | /* |
| 1503 | * We don't have to do anything, if the record was |
| 1504 | * committed the space will have been accounted for |
| 1505 | * in the blockmap. |
| 1506 | */ |
| 1507 | /* fall through */ |
| 1508 | case HAMMER_MEM_RECORD_GENERAL: |
| 1509 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 1510 | record->flags |= HAMMER_RECF_DELETED_BE; |
| 1511 | error = 0; |
| 1512 | goto done; |
| 1513 | case HAMMER_MEM_RECORD_ADD: |
| 1514 | panic("hammer_sync_record_callback: illegal add " |
| 1515 | "during inode deletion record %p", record); |
| 1516 | break; /* NOT REACHED */ |
| 1517 | case HAMMER_MEM_RECORD_INODE: |
| 1518 | panic("hammer_sync_record_callback: attempt to " |
| 1519 | "sync inode record %p?", record); |
| 1520 | break; /* NOT REACHED */ |
| 1521 | case HAMMER_MEM_RECORD_DEL: |
| 1522 | /* |
| 1523 | * Follow through and issue the on-disk deletion |
| 1524 | */ |
| 1525 | break; |
| 1526 | } |
| 1527 | } |
| 1528 | |
| 1529 | /* |
| 1530 | * If DELETED_FE is set special handling is needed for directory |
| 1531 | * entries. Dependant pieces related to the directory entry may |
| 1532 | * have already been synced to disk. If this occurs we have to |
| 1533 | * sync the directory entry and then change the in-memory record |
| 1534 | * from an ADD to a DELETE to cover the fact that it's been |
| 1535 | * deleted by the frontend. |
| 1536 | * |
| 1537 | * A directory delete covering record (MEM_RECORD_DEL) can never |
| 1538 | * be deleted by the frontend. |
| 1539 | * |
| 1540 | * Any other record type (aka DATA) can be deleted by the frontend. |
| 1541 | * XXX At the moment the flusher must skip it because there may |
| 1542 | * be another data record in the flush group for the same block, |
| 1543 | * meaning that some frontend data changes can leak into the backend's |
| 1544 | * synchronization point. |
| 1545 | */ |
| 1546 | if (record->flags & HAMMER_RECF_DELETED_FE) { |
| 1547 | if (record->type == HAMMER_MEM_RECORD_ADD) { |
| 1548 | record->flags |= HAMMER_RECF_CONVERT_DELETE; |
| 1549 | } else { |
| 1550 | KKASSERT(record->type != HAMMER_MEM_RECORD_DEL); |
| 1551 | record->flags |= HAMMER_RECF_DELETED_BE; |
| 1552 | error = 0; |
| 1553 | goto done; |
| 1554 | } |
| 1555 | } |
| 1556 | |
| 1557 | /* |
| 1558 | * Assign the create_tid for new records. Deletions already |
| 1559 | * have the record's entire key properly set up. |
| 1560 | */ |
| 1561 | if (record->type != HAMMER_MEM_RECORD_DEL) |
| 1562 | record->leaf.base.create_tid = trans->tid; |
| 1563 | for (;;) { |
| 1564 | error = hammer_ip_sync_record_cursor(cursor, record); |
| 1565 | if (error != EDEADLK) |
| 1566 | break; |
| 1567 | hammer_done_cursor(cursor); |
| 1568 | error = hammer_init_cursor(trans, cursor, &record->ip->cache[0], |
| 1569 | record->ip); |
| 1570 | if (error) |
| 1571 | break; |
| 1572 | } |
| 1573 | record->flags &= ~HAMMER_RECF_CONVERT_DELETE; |
| 1574 | |
| 1575 | if (error) { |
| 1576 | error = -error; |
| 1577 | if (error != -ENOSPC) { |
| 1578 | kprintf("hammer_sync_record_callback: sync failed rec " |
| 1579 | "%p, error %d\n", record, error); |
| 1580 | Debugger("sync failed rec"); |
| 1581 | } |
| 1582 | } |
| 1583 | done: |
| 1584 | hammer_flush_record_done(record, error); |
| 1585 | return(error); |
| 1586 | } |
| 1587 | |
| 1588 | /* |
| 1589 | * XXX error handling |
| 1590 | */ |
| 1591 | int |
| 1592 | hammer_sync_inode(hammer_inode_t ip) |
| 1593 | { |
| 1594 | struct hammer_transaction trans; |
| 1595 | struct hammer_cursor cursor; |
| 1596 | hammer_node_t tmp_node; |
| 1597 | hammer_record_t depend; |
| 1598 | hammer_record_t next; |
| 1599 | int error, tmp_error; |
| 1600 | u_int64_t nlinks; |
| 1601 | |
| 1602 | if ((ip->sync_flags & HAMMER_INODE_MODMASK) == 0) |
| 1603 | return(0); |
| 1604 | |
| 1605 | hammer_start_transaction_fls(&trans, ip->hmp); |
| 1606 | error = hammer_init_cursor(&trans, &cursor, &ip->cache[1], ip); |
| 1607 | if (error) |
| 1608 | goto done; |
| 1609 | |
| 1610 | /* |
| 1611 | * Any directory records referencing this inode which are not in |
| 1612 | * our current flush group must adjust our nlink count for the |
| 1613 | * purposes of synchronization to disk. |
| 1614 | * |
| 1615 | * Records which are in our flush group can be unlinked from our |
| 1616 | * inode now, potentially allowing the inode to be physically |
| 1617 | * deleted. |
| 1618 | * |
| 1619 | * This cannot block. |
| 1620 | */ |
| 1621 | nlinks = ip->ino_data.nlinks; |
| 1622 | next = TAILQ_FIRST(&ip->target_list); |
| 1623 | while ((depend = next) != NULL) { |
| 1624 | next = TAILQ_NEXT(depend, target_entry); |
| 1625 | if (depend->flush_state == HAMMER_FST_FLUSH && |
| 1626 | depend->flush_group == ip->hmp->flusher.act) { |
| 1627 | /* |
| 1628 | * If this is an ADD that was deleted by the frontend |
| 1629 | * the frontend nlinks count will have already been |
| 1630 | * decremented, but the backend is going to sync its |
| 1631 | * directory entry and must account for it. The |
| 1632 | * record will be converted to a delete-on-disk when |
| 1633 | * it gets synced. |
| 1634 | * |
| 1635 | * If the ADD was not deleted by the frontend we |
| 1636 | * can remove the dependancy from our target_list. |
| 1637 | */ |
| 1638 | if (depend->flags & HAMMER_RECF_DELETED_FE) { |
| 1639 | ++nlinks; |
| 1640 | } else { |
| 1641 | TAILQ_REMOVE(&ip->target_list, depend, |
| 1642 | target_entry); |
| 1643 | depend->target_ip = NULL; |
| 1644 | } |
| 1645 | } else if ((depend->flags & HAMMER_RECF_DELETED_FE) == 0) { |
| 1646 | /* |
| 1647 | * Not part of our flush group |
| 1648 | */ |
| 1649 | KKASSERT((depend->flags & HAMMER_RECF_DELETED_BE) == 0); |
| 1650 | switch(depend->type) { |
| 1651 | case HAMMER_MEM_RECORD_ADD: |
| 1652 | --nlinks; |
| 1653 | break; |
| 1654 | case HAMMER_MEM_RECORD_DEL: |
| 1655 | ++nlinks; |
| 1656 | break; |
| 1657 | default: |
| 1658 | break; |
| 1659 | } |
| 1660 | } |
| 1661 | } |
| 1662 | |
| 1663 | /* |
| 1664 | * Set dirty if we had to modify the link count. |
| 1665 | */ |
| 1666 | if (ip->sync_ino_data.nlinks != nlinks) { |
| 1667 | KKASSERT((int64_t)nlinks >= 0); |
| 1668 | ip->sync_ino_data.nlinks = nlinks; |
| 1669 | ip->sync_flags |= HAMMER_INODE_DDIRTY; |
| 1670 | } |
| 1671 | |
| 1672 | /* |
| 1673 | * If there is a trunction queued destroy any data past the (aligned) |
| 1674 | * truncation point. Userland will have dealt with the buffer |
| 1675 | * containing the truncation point for us. |
| 1676 | * |
| 1677 | * We don't flush pending frontend data buffers until after we've |
| 1678 | * dealt with the truncation. |
| 1679 | */ |
| 1680 | if (ip->sync_flags & HAMMER_INODE_TRUNCATED) { |
| 1681 | /* |
| 1682 | * Interlock trunc_off. The VOP front-end may continue to |
| 1683 | * make adjustments to it while we are blocked. |
| 1684 | */ |
| 1685 | off_t trunc_off; |
| 1686 | off_t aligned_trunc_off; |
| 1687 | int blkmask; |
| 1688 | |
| 1689 | trunc_off = ip->sync_trunc_off; |
| 1690 | blkmask = hammer_blocksize(trunc_off) - 1; |
| 1691 | aligned_trunc_off = (trunc_off + blkmask) & ~(int64_t)blkmask; |
| 1692 | |
| 1693 | /* |
| 1694 | * Delete any whole blocks on-media. The front-end has |
| 1695 | * already cleaned out any partial block and made it |
| 1696 | * pending. The front-end may have updated trunc_off |
| 1697 | * while we were blocked so we only use sync_trunc_off. |
| 1698 | */ |
| 1699 | error = hammer_ip_delete_range(&cursor, ip, |
| 1700 | aligned_trunc_off, |
| 1701 | 0x7FFFFFFFFFFFFFFFLL, 1); |
| 1702 | if (error) |
| 1703 | Debugger("hammer_ip_delete_range errored"); |
| 1704 | |
| 1705 | /* |
| 1706 | * Clear the truncation flag on the backend after we have |
| 1707 | * complete the deletions. Backend data is now good again |
| 1708 | * (including new records we are about to sync, below). |
| 1709 | * |
| 1710 | * Leave sync_trunc_off intact. As we write additional |
| 1711 | * records the backend will update sync_trunc_off. This |
| 1712 | * tells the backend whether it can skip the overwrite |
| 1713 | * test. This should work properly even when the backend |
| 1714 | * writes full blocks where the truncation point straddles |
| 1715 | * the block because the comparison is against the base |
| 1716 | * offset of the record. |
| 1717 | */ |
| 1718 | ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; |
| 1719 | /* ip->sync_trunc_off = 0x7FFFFFFFFFFFFFFFLL; */ |
| 1720 | } else { |
| 1721 | error = 0; |
| 1722 | } |
| 1723 | |
| 1724 | /* |
| 1725 | * Now sync related records. These will typically be directory |
| 1726 | * entries or delete-on-disk records. |
| 1727 | * |
| 1728 | * Not all records will be flushed, but clear XDIRTY anyway. We |
| 1729 | * will set it again in the frontend hammer_flush_inode_done() |
| 1730 | * if records remain. |
| 1731 | */ |
| 1732 | if (error == 0) { |
| 1733 | tmp_error = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL, |
| 1734 | hammer_sync_record_callback, &cursor); |
| 1735 | if (tmp_error < 0) |
| 1736 | tmp_error = -error; |
| 1737 | if (tmp_error) |
| 1738 | error = tmp_error; |
| 1739 | } |
| 1740 | hammer_cache_node(&ip->cache[1], cursor.node); |
| 1741 | |
| 1742 | /* |
| 1743 | * Re-seek for inode update. |
| 1744 | */ |
| 1745 | if (error == 0) { |
| 1746 | tmp_node = hammer_ref_node_safe(ip->hmp, &ip->cache[0], &error); |
| 1747 | if (tmp_node) { |
| 1748 | hammer_cursor_seek(&cursor, tmp_node, 0); |
| 1749 | hammer_rel_node(tmp_node); |
| 1750 | } |
| 1751 | error = 0; |
| 1752 | } |
| 1753 | |
| 1754 | /* |
| 1755 | * If we are deleting the inode the frontend had better not have |
| 1756 | * any active references on elements making up the inode. |
| 1757 | */ |
| 1758 | if (error == 0 && ip->sync_ino_data.nlinks == 0 && |
| 1759 | RB_EMPTY(&ip->rec_tree) && |
| 1760 | (ip->sync_flags & HAMMER_INODE_DELETING) && |
| 1761 | (ip->flags & HAMMER_INODE_DELETED) == 0) { |
| 1762 | int count1 = 0; |
| 1763 | |
| 1764 | ip->flags |= HAMMER_INODE_DELETED; |
| 1765 | error = hammer_ip_delete_range_all(&cursor, ip, &count1); |
| 1766 | if (error == 0) { |
| 1767 | ip->sync_flags &= ~HAMMER_INODE_DELETING; |
| 1768 | ip->sync_flags &= ~HAMMER_INODE_TRUNCATED; |
| 1769 | KKASSERT(RB_EMPTY(&ip->rec_tree)); |
| 1770 | |
| 1771 | /* |
| 1772 | * Set delete_tid in both the frontend and backend |
| 1773 | * copy of the inode record. The DELETED flag handles |
| 1774 | * this, do not set RDIRTY. |
| 1775 | */ |
| 1776 | ip->ino_leaf.base.delete_tid = trans.tid; |
| 1777 | ip->sync_ino_leaf.base.delete_tid = trans.tid; |
| 1778 | |
| 1779 | /* |
| 1780 | * Adjust the inode count in the volume header |
| 1781 | */ |
| 1782 | if (ip->flags & HAMMER_INODE_ONDISK) { |
| 1783 | hammer_modify_volume_field(&trans, |
| 1784 | trans.rootvol, |
| 1785 | vol0_stat_inodes); |
| 1786 | --ip->hmp->rootvol->ondisk->vol0_stat_inodes; |
| 1787 | hammer_modify_volume_done(trans.rootvol); |
| 1788 | } |
| 1789 | } else { |
| 1790 | ip->flags &= ~HAMMER_INODE_DELETED; |
| 1791 | Debugger("hammer_ip_delete_range_all errored"); |
| 1792 | } |
| 1793 | } |
| 1794 | |
| 1795 | ip->sync_flags &= ~HAMMER_INODE_BUFS; |
| 1796 | |
| 1797 | if (error) |
| 1798 | Debugger("RB_SCAN errored"); |
| 1799 | |
| 1800 | /* |
| 1801 | * Now update the inode's on-disk inode-data and/or on-disk record. |
| 1802 | * DELETED and ONDISK are managed only in ip->flags. |
| 1803 | */ |
| 1804 | switch(ip->flags & (HAMMER_INODE_DELETED | HAMMER_INODE_ONDISK)) { |
| 1805 | case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK: |
| 1806 | /* |
| 1807 | * If deleted and on-disk, don't set any additional flags. |
| 1808 | * the delete flag takes care of things. |
| 1809 | * |
| 1810 | * Clear flags which may have been set by the frontend. |
| 1811 | */ |
| 1812 | ip->sync_flags &= ~(HAMMER_INODE_DDIRTY| |
| 1813 | HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES| |
| 1814 | HAMMER_INODE_DELETING); |
| 1815 | break; |
| 1816 | case HAMMER_INODE_DELETED: |
| 1817 | /* |
| 1818 | * Take care of the case where a deleted inode was never |
| 1819 | * flushed to the disk in the first place. |
| 1820 | * |
| 1821 | * Clear flags which may have been set by the frontend. |
| 1822 | */ |
| 1823 | ip->sync_flags &= ~(HAMMER_INODE_DDIRTY| |
| 1824 | HAMMER_INODE_XDIRTY|HAMMER_INODE_ITIMES| |
| 1825 | HAMMER_INODE_DELETING); |
| 1826 | while (RB_ROOT(&ip->rec_tree)) { |
| 1827 | hammer_record_t record = RB_ROOT(&ip->rec_tree); |
| 1828 | hammer_ref(&record->lock); |
| 1829 | KKASSERT(record->lock.refs == 1); |
| 1830 | record->flags |= HAMMER_RECF_DELETED_FE; |
| 1831 | record->flags |= HAMMER_RECF_DELETED_BE; |
| 1832 | hammer_rel_mem_record(record); |
| 1833 | } |
| 1834 | break; |
| 1835 | case HAMMER_INODE_ONDISK: |
| 1836 | /* |
| 1837 | * If already on-disk, do not set any additional flags. |
| 1838 | */ |
| 1839 | break; |
| 1840 | default: |
| 1841 | /* |
| 1842 | * If not on-disk and not deleted, set both dirty flags |
| 1843 | * to force an initial record to be written. Also set |
| 1844 | * the create_tid for the inode. |
| 1845 | * |
| 1846 | * Set create_tid in both the frontend and backend |
| 1847 | * copy of the inode record. |
| 1848 | */ |
| 1849 | ip->ino_leaf.base.create_tid = trans.tid; |
| 1850 | ip->sync_ino_leaf.base.create_tid = trans.tid; |
| 1851 | ip->sync_flags |= HAMMER_INODE_DDIRTY; |
| 1852 | break; |
| 1853 | } |
| 1854 | |
| 1855 | /* |
| 1856 | * If RDIRTY or DDIRTY is set, write out a new record. If the inode |
| 1857 | * is already on-disk the old record is marked as deleted. |
| 1858 | * |
| 1859 | * If DELETED is set hammer_update_inode() will delete the existing |
| 1860 | * record without writing out a new one. |
| 1861 | * |
| 1862 | * If *ONLY* the ITIMES flag is set we can update the record in-place. |
| 1863 | */ |
| 1864 | if (ip->flags & HAMMER_INODE_DELETED) { |
| 1865 | error = hammer_update_inode(&cursor, ip); |
| 1866 | } else |
| 1867 | if ((ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ITIMES)) == |
| 1868 | HAMMER_INODE_ITIMES) { |
| 1869 | error = hammer_update_itimes(&cursor, ip); |
| 1870 | } else |
| 1871 | if (ip->sync_flags & (HAMMER_INODE_DDIRTY | HAMMER_INODE_ITIMES)) { |
| 1872 | error = hammer_update_inode(&cursor, ip); |
| 1873 | } |
| 1874 | if (error) |
| 1875 | Debugger("hammer_update_itimes/inode errored"); |
| 1876 | done: |
| 1877 | /* |
| 1878 | * Save the TID we used to sync the inode with to make sure we |
| 1879 | * do not improperly reuse it. |
| 1880 | */ |
| 1881 | hammer_done_cursor(&cursor); |
| 1882 | hammer_done_transaction(&trans); |
| 1883 | return(error); |
| 1884 | } |
| 1885 | |
| 1886 | /* |
| 1887 | * This routine is called when the OS is no longer actively referencing |
| 1888 | * the inode (but might still be keeping it cached), or when releasing |
| 1889 | * the last reference to an inode. |
| 1890 | * |
| 1891 | * At this point if the inode's nlinks count is zero we want to destroy |
| 1892 | * it, which may mean destroying it on-media too. |
| 1893 | */ |
| 1894 | void |
| 1895 | hammer_inode_unloadable_check(hammer_inode_t ip, int getvp) |
| 1896 | { |
| 1897 | struct vnode *vp; |
| 1898 | |
| 1899 | /* |
| 1900 | * Set the DELETING flag when the link count drops to 0 and the |
| 1901 | * OS no longer has any opens on the inode. |
| 1902 | * |
| 1903 | * The backend will clear DELETING (a mod flag) and set DELETED |
| 1904 | * (a state flag) when it is actually able to perform the |
| 1905 | * operation. |
| 1906 | */ |
| 1907 | if (ip->ino_data.nlinks == 0 && |
| 1908 | (ip->flags & (HAMMER_INODE_DELETING|HAMMER_INODE_DELETED)) == 0) { |
| 1909 | ip->flags |= HAMMER_INODE_DELETING; |
| 1910 | ip->flags |= HAMMER_INODE_TRUNCATED; |
| 1911 | ip->trunc_off = 0; |
| 1912 | vp = NULL; |
| 1913 | if (getvp) { |
| 1914 | if (hammer_get_vnode(ip, &vp) != 0) |
| 1915 | return; |
| 1916 | } |
| 1917 | |
| 1918 | /* |
| 1919 | * Final cleanup |
| 1920 | */ |
| 1921 | if (ip->vp) { |
| 1922 | vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE); |
| 1923 | vnode_pager_setsize(ip->vp, 0); |
| 1924 | } |
| 1925 | if (getvp) { |
| 1926 | vput(vp); |
| 1927 | } |
| 1928 | } |
| 1929 | } |
| 1930 | |
| 1931 | /* |
| 1932 | * Re-test an inode when a dependancy had gone away to see if we |
| 1933 | * can chain flush it. |
| 1934 | */ |
| 1935 | void |
| 1936 | hammer_test_inode(hammer_inode_t ip) |
| 1937 | { |
| 1938 | if (ip->flags & HAMMER_INODE_REFLUSH) { |
| 1939 | ip->flags &= ~HAMMER_INODE_REFLUSH; |
| 1940 | hammer_ref(&ip->lock); |
| 1941 | if (ip->flags & HAMMER_INODE_RESIGNAL) { |
| 1942 | ip->flags &= ~HAMMER_INODE_RESIGNAL; |
| 1943 | hammer_flush_inode(ip, HAMMER_FLUSH_SIGNAL); |
| 1944 | } else { |
| 1945 | hammer_flush_inode(ip, 0); |
| 1946 | } |
| 1947 | hammer_rel_inode(ip, 0); |
| 1948 | } |
| 1949 | } |
| 1950 | |
| 1951 | /* |
| 1952 | * Clear the RECLAIM flag on an inode. This occurs when the inode is |
| 1953 | * reassociated with a vp or just before it gets freed. |
| 1954 | * |
| 1955 | * Wakeup one thread blocked waiting on reclaims to complete. Note that |
| 1956 | * the inode the thread is waiting on behalf of is a different inode then |
| 1957 | * the inode we are called with. This is to create a pipeline. |
| 1958 | */ |
| 1959 | static void |
| 1960 | hammer_inode_wakereclaims(hammer_inode_t ip) |
| 1961 | { |
| 1962 | struct hammer_reclaim *reclaim; |
| 1963 | hammer_mount_t hmp = ip->hmp; |
| 1964 | |
| 1965 | if ((ip->flags & HAMMER_INODE_RECLAIM) == 0) |
| 1966 | return; |
| 1967 | |
| 1968 | --hammer_count_reclaiming; |
| 1969 | --hmp->inode_reclaims; |
| 1970 | ip->flags &= ~HAMMER_INODE_RECLAIM; |
| 1971 | |
| 1972 | if ((reclaim = TAILQ_FIRST(&hmp->reclaim_list)) != NULL) { |
| 1973 | TAILQ_REMOVE(&hmp->reclaim_list, reclaim, entry); |
| 1974 | reclaim->okydoky = 1; |
| 1975 | wakeup(reclaim); |
| 1976 | } |
| 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * Setup our reclaim pipeline. We only let so many detached (and dirty) |
| 1981 | * inodes build up before we start blocking. |
| 1982 | * |
| 1983 | * When we block we don't care *which* inode has finished reclaiming, |
| 1984 | * as lone as one does. This is somewhat heuristical... we also put a |
| 1985 | * cap on how long we are willing to wait. |
| 1986 | */ |
| 1987 | void |
| 1988 | hammer_inode_waitreclaims(hammer_mount_t hmp) |
| 1989 | { |
| 1990 | struct hammer_reclaim reclaim; |
| 1991 | int delay; |
| 1992 | |
| 1993 | if (hmp->inode_reclaims > HAMMER_RECLAIM_WAIT) { |
| 1994 | reclaim.okydoky = 0; |
| 1995 | TAILQ_INSERT_TAIL(&hmp->reclaim_list, |
| 1996 | &reclaim, entry); |
| 1997 | } else { |
| 1998 | reclaim.okydoky = 1; |
| 1999 | } |
| 2000 | |
| 2001 | if (reclaim.okydoky == 0) { |
| 2002 | delay = (hmp->inode_reclaims - HAMMER_RECLAIM_WAIT) * hz / |
| 2003 | HAMMER_RECLAIM_WAIT; |
| 2004 | if (delay >= 0) |
| 2005 | tsleep(&reclaim, 0, "hmrrcm", delay + 1); |
| 2006 | if (reclaim.okydoky == 0) |
| 2007 | TAILQ_REMOVE(&hmp->reclaim_list, &reclaim, entry); |
| 2008 | } |
| 2009 | } |
| 2010 | |