Add support for Intel 7221's and 845M GMCH controllers.
[dragonfly.git] / sys / vfs / hammer / hammer_inode.c
CommitLineData
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1/*
2 * Copyright (c) 2007 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 *
7f7c1f84 34 * $DragonFly: src/sys/vfs/hammer/hammer_inode.c,v 1.9 2007/11/27 07:48:52 dillon Exp $
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35 */
36
37#include "hammer.h"
38#include <sys/buf.h>
39#include <sys/buf2.h>
40
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41int
42hammer_vop_inactive(struct vop_inactive_args *ap)
43{
66325755 44 struct hammer_inode *ip = VTOI(ap->a_vp);
27ea2398 45
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46 /*
47 * Degenerate case
48 */
49 if (ip == NULL) {
66325755 50 vrecycle(ap->a_vp);
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51 return(0);
52 }
53
54 /*
55 * If the inode no longer has any references we recover its
56 * in-memory resources immediately.
57 */
58 if (ip->ino_rec.ino_nlinks == 0 &&
59 (ip->hmp->mp->mnt_flag & MNT_RDONLY) == 0) {
60 hammer_sync_inode(ip, MNT_NOWAIT, 1);
61 }
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62 return(0);
63}
64
65int
66hammer_vop_reclaim(struct vop_reclaim_args *ap)
67{
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68 struct hammer_inode *ip;
69 struct vnode *vp;
70
71 vp = ap->a_vp;
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72
73 /*
74 * Release the vnode association and ask that the inode be flushed.
75 */
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76 if ((ip = vp->v_data) != NULL) {
77 vp->v_data = NULL;
78 ip->vp = NULL;
79 hammer_rel_inode(ip, 1);
80 }
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81 return(0);
82}
83
84/*
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85 * Obtain a vnode for the specified inode number. An exclusively locked
86 * vnode is returned.
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87 */
88int
89hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
90{
91 struct hammer_mount *hmp = (void *)mp->mnt_data;
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92 struct hammer_inode *ip;
93 int error;
94
95 /*
96 * Get/allocate the hammer_inode structure. The structure must be
97 * unlocked while we manipulate the related vnode to avoid a
98 * deadlock.
99 */
7f7c1f84 100 ip = hammer_get_inode(hmp, ino, hmp->asof, &error);
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101 if (ip == NULL) {
102 *vpp = NULL;
103 return(error);
104 }
66325755 105 error = hammer_get_vnode(ip, LK_EXCLUSIVE, vpp);
a89aec1b 106 hammer_rel_inode(ip, 0);
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107 return (error);
108}
109
110/*
111 * Return a locked vnode for the specified inode. The inode must be
112 * referenced but NOT LOCKED on entry and will remain referenced on
113 * return.
114 */
115int
116hammer_get_vnode(struct hammer_inode *ip, int lktype, struct vnode **vpp)
117{
118 struct vnode *vp;
119 int error = 0;
120
121 for (;;) {
122 if ((vp = ip->vp) == NULL) {
123 error = getnewvnode(VT_HAMMER, ip->hmp->mp, vpp, 0, 0);
124 if (error)
125 break;
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126 hammer_lock_ex(&ip->lock);
127 if (ip->vp != NULL) {
128 hammer_unlock(&ip->lock);
129 vp->v_type = VBAD;
130 vx_put(vp);
131 continue;
66325755 132 }
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133 hammer_ref(&ip->lock);
134 vp = *vpp;
135 ip->vp = vp;
136 vp->v_type = hammer_get_vnode_type(
137 ip->ino_rec.base.base.obj_type);
138 vp->v_data = (void *)ip;
139 /* vnode locked by getnewvnode() */
140 /* make related vnode dirty if inode dirty? */
141 hammer_unlock(&ip->lock);
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142 if (vp->v_type == VREG)
143 vinitvmio(vp, ip->ino_rec.ino_size);
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144 break;
145 }
146
147 /*
148 * loop if the vget fails (aka races), or if the vp
149 * no longer matches ip->vp.
150 */
151 if (vget(vp, LK_EXCLUSIVE) == 0) {
152 if (vp == ip->vp)
153 break;
154 vput(vp);
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155 }
156 }
a89aec1b 157 *vpp = vp;
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158 return(error);
159}
160
161/*
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162 * Acquire a HAMMER inode. The returned inode is not locked. These functions
163 * do not attach or detach the related vnode (use hammer_get_vnode() for
164 * that).
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165 */
166struct hammer_inode *
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167hammer_get_inode(struct hammer_mount *hmp, u_int64_t obj_id, hammer_tid_t asof,
168 int *errorp)
66325755 169{
427e5fc6 170 struct hammer_inode_info iinfo;
8cd0a023 171 struct hammer_cursor cursor;
427e5fc6 172 struct hammer_inode *ip;
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173
174 /*
175 * Determine if we already have an inode cached. If we do then
176 * we are golden.
177 */
66325755 178 iinfo.obj_id = obj_id;
7f7c1f84 179 iinfo.obj_asof = asof;
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180loop:
181 ip = hammer_ino_rb_tree_RB_LOOKUP_INFO(&hmp->rb_inos_root, &iinfo);
182 if (ip) {
8cd0a023 183 hammer_ref(&ip->lock);
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184 *errorp = 0;
185 return(ip);
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186 }
187
427e5fc6 188 ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
66325755 189 ip->obj_id = obj_id;
27ea2398 190 ip->obj_asof = iinfo.obj_asof;
66325755 191 ip->hmp = hmp;
8cd0a023 192 RB_INIT(&ip->rec_tree);
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193
194 /*
8cd0a023 195 * Locate the on-disk inode.
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196 * If we do not have an inode cached search the HAMMER on-disk B-Tree
197 * for it.
198 */
427e5fc6 199
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200 hammer_init_cursor_hmp(&cursor, hmp);
201 cursor.key_beg.obj_id = ip->obj_id;
202 cursor.key_beg.key = 0;
203 cursor.key_beg.create_tid = iinfo.obj_asof;
204 cursor.key_beg.delete_tid = 0;
205 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
206 cursor.key_beg.obj_type = 0;
a89aec1b 207 cursor.flags = HAMMER_CURSOR_GET_RECORD | HAMMER_CURSOR_GET_DATA;
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208
209 *errorp = hammer_btree_lookup(&cursor);
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210
211 /*
212 * On success the B-Tree lookup will hold the appropriate
213 * buffer cache buffers and provide a pointer to the requested
214 * information. Copy the information to the in-memory inode.
215 */
66325755 216 if (*errorp == 0) {
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217 ip->ino_rec = cursor.record->inode;
218 ip->ino_data = cursor.data->inode;
427e5fc6 219 }
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220 hammer_cache_node(cursor.node, &ip->cache);
221 hammer_done_cursor(&cursor);
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222
223 /*
224 * On success load the inode's record and data and insert the
225 * inode into the B-Tree. It is possible to race another lookup
226 * insertion of the same inode so deal with that condition too.
227 */
66325755 228 if (*errorp == 0) {
8cd0a023 229 hammer_ref(&ip->lock);
427e5fc6 230 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
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231 hammer_uncache_node(&ip->cache);
232 hammer_unref(&ip->lock);
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233 kfree(ip, M_HAMMER);
234 goto loop;
235 }
c0ade690 236 ip->flags |= HAMMER_INODE_ONDISK;
427e5fc6 237 } else {
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238 kfree(ip, M_HAMMER);
239 ip = NULL;
427e5fc6 240 }
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241 return (ip);
242}
243
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244/*
245 * Create a new filesystem object, returning the inode in *ipp. The
246 * returned inode will be referenced but not locked.
247 *
248 * The inode is created in-memory and will be delay-synchronized to the
249 * disk.
250 */
251int
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252hammer_create_inode(hammer_transaction_t trans, struct vattr *vap,
253 struct ucred *cred, hammer_inode_t dip,
8cd0a023 254 struct hammer_inode **ipp)
66325755 255{
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256 hammer_mount_t hmp;
257 hammer_inode_t ip;
6b4f890b 258 uid_t xuid;
66325755 259
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260 hmp = trans->hmp;
261 ip = kmalloc(sizeof(*ip), M_HAMMER, M_WAITOK|M_ZERO);
a89aec1b 262 ip->obj_id = hammer_alloc_tid(trans);
8cd0a023 263 KKASSERT(ip->obj_id != 0);
7f7c1f84 264 ip->obj_asof = hmp->asof;
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265 ip->hmp = hmp;
266 ip->flags = HAMMER_INODE_DDIRTY | HAMMER_INODE_RDIRTY |
267 HAMMER_INODE_ITIMES;
268 ip->last_tid = trans->tid;
269
270 RB_INIT(&ip->rec_tree);
271
272 ip->ino_rec.ino_atime = trans->tid;
273 ip->ino_rec.ino_mtime = trans->tid;
274 ip->ino_rec.ino_size = 0;
275 ip->ino_rec.ino_nlinks = 0;
276 /* XXX */
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277 kprintf("rootvol %p ondisk %p\n", hmp->rootvol, hmp->rootvol->ondisk);
278 ip->ino_rec.base.rec_id = hammer_alloc_recid(trans);
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279 KKASSERT(ip->ino_rec.base.rec_id != 0);
280 ip->ino_rec.base.base.obj_id = ip->obj_id;
281 ip->ino_rec.base.base.key = 0;
282 ip->ino_rec.base.base.create_tid = trans->tid;
283 ip->ino_rec.base.base.delete_tid = 0;
284 ip->ino_rec.base.base.rec_type = HAMMER_RECTYPE_INODE;
285 ip->ino_rec.base.base.obj_type = hammer_get_obj_type(vap->va_type);
286
287 ip->ino_data.version = HAMMER_INODE_DATA_VERSION;
288 ip->ino_data.mode = vap->va_mode;
289 ip->ino_data.ctime = trans->tid;
290 ip->ino_data.parent_obj_id = (dip) ? dip->ino_rec.base.base.obj_id : 0;
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291
292 /*
293 * Calculate default uid/gid and overwrite with information from
294 * the vap.
295 */
296 xuid = hammer_to_unix_xid(&dip->ino_data.uid);
297 ip->ino_data.gid = dip->ino_data.gid;
298 xuid = vop_helper_create_uid(hmp->mp, dip->ino_data.mode, xuid, cred,
299 &vap->va_mode);
300 ip->ino_data.mode = vap->va_mode;
301
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302 if (vap->va_vaflags & VA_UID_UUID_VALID)
303 ip->ino_data.uid = vap->va_uid_uuid;
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304 else if (vap->va_uid != (uid_t)VNOVAL)
305 hammer_guid_to_uuid(&ip->ino_data.uid, xuid);
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306 if (vap->va_vaflags & VA_GID_UUID_VALID)
307 ip->ino_data.gid = vap->va_gid_uuid;
6b4f890b 308 else if (vap->va_gid != (gid_t)VNOVAL)
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309 hammer_guid_to_uuid(&ip->ino_data.gid, vap->va_gid);
310
311 hammer_ref(&ip->lock);
312 if (RB_INSERT(hammer_ino_rb_tree, &hmp->rb_inos_root, ip)) {
313 hammer_unref(&ip->lock);
a89aec1b 314 panic("hammer_create_inode: duplicate obj_id %llx", ip->obj_id);
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315 }
316 *ipp = ip;
317 return(0);
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318}
319
c0ade690 320int
7f7c1f84 321hammer_update_inode(hammer_inode_t ip)
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322{
323 struct hammer_cursor cursor;
324 hammer_record_t record;
325 int error;
326
327 /*
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328 * Locate the record on-disk and mark it as deleted. Both the B-Tree
329 * node and the record must be marked deleted. Adjusting delete_tid
330 * does not effect the element position in the B-Tree.
331 *
332 * If the inode is already deleted on-disk we have nothing to do.
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333 *
334 * XXX Update the inode record and data in-place if the retention
335 * policy allows it.
336 */
337 error = 0;
338
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339 if ((ip->flags & (HAMMER_INODE_ONDISK|HAMMER_INODE_DELONDISK)) ==
340 HAMMER_INODE_ONDISK) {
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341 hammer_init_cursor_ip(&cursor, ip);
342 cursor.key_beg.obj_id = ip->obj_id;
343 cursor.key_beg.key = 0;
344 cursor.key_beg.create_tid = ip->obj_asof;
345 cursor.key_beg.delete_tid = 0;
346 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
347 cursor.key_beg.obj_type = 0;
348 cursor.flags = HAMMER_CURSOR_GET_RECORD;
349
350 error = hammer_btree_lookup(&cursor);
351
352 if (error == 0) {
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353 cursor.record->base.base.delete_tid = ip->last_tid;
354 cursor.node->ondisk->elms[cursor.index].leaf.base.delete_tid = ip->last_tid;
c0ade690 355 hammer_modify_buffer(cursor.record_buffer);
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356 hammer_modify_node(cursor.node);
357 ip->flags |= HAMMER_INODE_DELONDISK;
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358 }
359 hammer_cache_node(cursor.node, &ip->cache);
360 hammer_done_cursor(&cursor);
361 }
362
363 /*
364 * Write out a new record if the in-memory inode is not marked
365 * as having been deleted.
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366 *
367 * If the inode has been deleted permanently, HAMMER_INODE_DELONDISK
368 * will remain set and prevent further updates.
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369 */
370 if (error == 0 && (ip->flags & HAMMER_INODE_DELETED) == 0) {
7f7c1f84 371 record = hammer_alloc_mem_record(ip);
c0ade690 372 record->rec.inode = ip->ino_rec;
7f7c1f84 373 record->rec.inode.base.base.create_tid = ip->last_tid;
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374 record->rec.inode.base.data_len = sizeof(ip->ino_data);
375 record->data = (void *)&ip->ino_data;
376 error = hammer_ip_sync_record(record);
377 hammer_free_mem_record(record);
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378 ip->flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY|
379 HAMMER_INODE_DELONDISK);
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380 ip->flags |= HAMMER_INODE_ONDISK;
381 }
7f7c1f84 382 ip->flags &= ~HAMMER_INODE_TID;
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383 return(error);
384}
385
a89aec1b 386/*
6b4f890b 387 * Release a reference on an inode and unload it if told to flush.
a89aec1b 388 */
66325755 389void
a89aec1b 390hammer_rel_inode(struct hammer_inode *ip, int flush)
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391{
392 hammer_unref(&ip->lock);
6b4f890b 393 if (flush || ip->ino_rec.ino_nlinks == 0)
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394 ip->flags |= HAMMER_INODE_FLUSH;
395 if (ip->lock.refs == 0 && (ip->flags & HAMMER_INODE_FLUSH))
396 hammer_unload_inode(ip, NULL);
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397}
398
27ea2398 399/*
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400 * Unload and destroy the specified inode.
401 *
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402 * (called via RB_SCAN)
403 */
404int
66325755 405hammer_unload_inode(struct hammer_inode *ip, void *data __unused)
27ea2398 406{
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407 int error;
408
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409 KASSERT(ip->lock.refs == 0,
410 ("hammer_unload_inode: %d refs\n", ip->lock.refs));
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411 KKASSERT(ip->vp == NULL);
412 hammer_ref(&ip->lock);
6b4f890b 413
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414 error = hammer_sync_inode(ip, MNT_WAIT, 1);
415 if (error)
416 kprintf("hammer_sync_inode failed error %d\n", error);
6b4f890b 417
66325755 418 RB_REMOVE(hammer_ino_rb_tree, &ip->hmp->rb_inos_root, ip);
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419
420 hammer_uncache_node(&ip->cache);
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421 kfree(ip, M_HAMMER);
422 return(0);
423}
424
427e5fc6 425/*
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426 * A transaction has modified an inode, requiring a new record and possibly
427 * also data to be written out.
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428 *
429 * last_tid is the TID to use for the disk sync.
427e5fc6 430 */
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431void
432hammer_modify_inode(struct hammer_transaction *trans,
433 struct hammer_inode *ip, int flags)
427e5fc6 434{
7f7c1f84 435 if ((flags & HAMMER_INODE_TID) && (ip->flags & HAMMER_INODE_TID) == 0) {
c0ade690 436 ip->last_tid = trans->tid;
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437 }
438 ip->flags |= flags;
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439}
440
441/*
442 * Sync any dirty buffers and records associated with an inode. The
443 * inode's last_tid field is used as the transaction id for the sync,
444 * overriding any intermediate TIDs that were used for records. Note
445 * that the dirty buffer cache buffers do not have any knowledge of
446 * the transaction id they were modified under.
447 */
448static int
449hammer_sync_inode_callback(hammer_record_t rec, void *data __unused)
450{
451 int error;
452
453 error = 0;
454 if ((rec->flags & HAMMER_RECF_DELETED) == 0)
455 error = hammer_ip_sync_record(rec);
456
457 if (error) {
458 kprintf("hammer_sync_inode_callback: sync failed rec %p\n",
459 rec);
460 return(-1);
461 }
462 hammer_free_mem_record(rec);
463 return(0);
464}
465
466/*
467 * XXX error handling
468 */
469int
470hammer_sync_inode(hammer_inode_t ip, int waitfor, int handle_delete)
471{
472 struct hammer_transaction trans;
473 int error;
474 int r;
475
476 hammer_lock_ex(&ip->lock);
477 hammer_start_transaction(&trans, ip->hmp);
478
479 /*
480 * If the inode has been deleted (nlinks == 0), and the OS no longer
481 * has any references to it (handle_delete != 0), clean up in-memory
482 * data.
483 *
484 * NOTE: We do not set the RDIRTY flag when updating the delete_tid,
485 * setting HAMMER_INODE_DELETED takes care of it.
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486 *
487 * NOTE: Because we may sync records within this new transaction,
488 * force the inode update later on to use our transaction id or
489 * the delete_tid of the inode may be less then the create_tid of
490 * the inode update. XXX shouldn't happen but don't take the chance.
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491 */
492 if (ip->ino_rec.ino_nlinks == 0 && handle_delete) {
493 if (ip->vp)
494 vtruncbuf(ip->vp, 0, HAMMER_BUFSIZE);
495 error = hammer_ip_delete_range(&trans, ip,
496 HAMMER_MIN_KEY, HAMMER_MAX_KEY);
497 KKASSERT(RB_EMPTY(&ip->rec_tree));
7f7c1f84 498 ip->flags &= ~HAMMER_INODE_TID;
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499 ip->ino_rec.base.base.delete_tid = trans.tid;
500 hammer_modify_inode(&trans, ip,
501 HAMMER_INODE_DELETED | HAMMER_INODE_TID);
502 }
503
504 /*
505 * Sync the buffer cache
506 */
507 if (ip->vp != NULL)
508 error = vfsync(ip->vp, waitfor, 1, NULL, NULL);
509 else
510 error = 0;
511
512 /*
513 * Now sync related records
514 */
515 if (error == 0) {
516 r = RB_SCAN(hammer_rec_rb_tree, &ip->rec_tree, NULL,
517 hammer_sync_inode_callback, NULL);
518 if (r < 0)
519 error = EIO;
520 }
521
522 /*
523 * Now update the inode's on-disk inode-data and/or on-disk record.
524 */
525 switch(ip->flags & (HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK)) {
526 case HAMMER_INODE_DELETED|HAMMER_INODE_ONDISK:
527 /*
528 * If deleted and on-disk, don't set any additional flags.
529 * the delete flag takes care of things.
530 */
531 break;
532 case HAMMER_INODE_DELETED:
533 /*
534 * Take care of the case where a deleted inode was never
535 * flushed to the disk in the first place.
536 */
537 ip->flags &= ~(HAMMER_INODE_RDIRTY|HAMMER_INODE_DDIRTY);
538 while (RB_ROOT(&ip->rec_tree))
539 hammer_free_mem_record(RB_ROOT(&ip->rec_tree));
540 break;
541 case HAMMER_INODE_ONDISK:
542 /*
543 * If already on-disk, do not set any additional flags.
544 */
545 break;
546 default:
547 /*
548 * If not on-disk and not deleted, set both dirty flags
549 * to force an initial record to be written.
550 */
551 ip->flags |= HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY;
552 break;
553 }
554
555 /*
556 * If RDIRTY or DDIRTY is set, write out a new record. If the
557 * inode is already on-disk, the old record is marked as deleted.
558 */
559 if (ip->flags & (HAMMER_INODE_RDIRTY | HAMMER_INODE_DDIRTY |
560 HAMMER_INODE_DELETED)) {
7f7c1f84 561 error = hammer_update_inode(ip);
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562 }
563 hammer_commit_transaction(&trans);
564 hammer_unlock(&ip->lock);
565 return(error);
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566}
567
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568/*
569 * Access the filesystem buffer containing the cluster-relative byte
570 * offset, validate the buffer type, load *bufferp and return a
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571 * pointer to the requested data. The buffer is reference and locked on
572 * return.
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573 *
574 * If buf_type is 0 the buffer is assumed to be a pure-data buffer and
575 * no type or crc check is performed.
576 *
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577 * If *bufferp is not NULL on entry it is assumed to contain a locked
578 * and referenced buffer which will then be replaced.
579 *
580 * If the caller is holding another unrelated buffer locked it must be
581 * passed in reorderbuf so we can properly order buffer locks.
582 *
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583 * XXX add a flag for the buffer type and check the CRC here XXX
584 */
585void *
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586hammer_bread(hammer_cluster_t cluster, int32_t cloff,
587 u_int64_t buf_type, int *errorp,
588 struct hammer_buffer **bufferp)
427e5fc6 589{
8cd0a023 590 hammer_buffer_t buffer;
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591 int32_t buf_no;
592 int32_t buf_off;
593
594 /*
595 * Load the correct filesystem buffer, replacing *bufferp.
596 */
597 buf_no = cloff / HAMMER_BUFSIZE;
598 buffer = *bufferp;
599 if (buffer == NULL || buffer->cluster != cluster ||
600 buffer->buf_no != buf_no) {
8cd0a023 601 if (buffer) {
c0ade690 602 /*hammer_unlock(&buffer->io.lock);*/
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603 hammer_rel_buffer(buffer, 0);
604 }
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605 buffer = hammer_get_buffer(cluster, buf_no, 0, errorp);
606 *bufferp = buffer;
607 if (buffer == NULL)
608 return(NULL);
c0ade690 609 /*hammer_lock_ex(&buffer->io.lock);*/
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610 }
611
612 /*
8cd0a023 613 * Validate the buffer type
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614 */
615 buf_off = cloff & HAMMER_BUFMASK;
616 if (buf_type) {
617 if (buf_type != buffer->ondisk->head.buf_type) {
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618 kprintf("BUFFER HEAD TYPE MISMATCH %llx %llx\n",
619 buf_type, buffer->ondisk->head.buf_type);
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620 *errorp = EIO;
621 return(NULL);
622 }
623 if (buf_off < sizeof(buffer->ondisk->head)) {
27ea2398 624 kprintf("BUFFER OFFSET TOO LOW %d\n", buf_off);
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625 *errorp = EIO;
626 return(NULL);
627 }
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628 }
629
630 /*
631 * Return a pointer to the buffer data.
632 */
633 *errorp = 0;
634 return((char *)buffer->ondisk + buf_off);
635}
636