tmpfs - Fix numerous races and adjust to use cache_unlink()
[dragonfly.git] / sys / vfs / tmpfs / tmpfs_subr.c
CommitLineData
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1/* $NetBSD: tmpfs_subr.c,v 1.35 2007/07/09 21:10:50 ad Exp $ */
2
3/*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * 2005 program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * Efficient memory file system supporting functions.
35 */
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36
37#include <sys/kernel.h>
38#include <sys/param.h>
39#include <sys/namei.h>
40#include <sys/priv.h>
41#include <sys/proc.h>
42#include <sys/spinlock2.h>
43#include <sys/stat.h>
44#include <sys/systm.h>
45#include <sys/vnode.h>
46#include <sys/vmmeter.h>
47
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48#include <vm/vm.h>
49#include <vm/vm_object.h>
50#include <vm/vm_page.h>
51#include <vm/vm_pager.h>
52#include <vm/vm_extern.h>
53
54#include <vfs/tmpfs/tmpfs.h>
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55#include <vfs/tmpfs/tmpfs_vnops.h>
56
f7db522f 57static ino_t tmpfs_fetch_ino(struct tmpfs_mount *);
29ca4fd6
JH
58static int tmpfs_dirtree_compare(struct tmpfs_dirent *a,
59 struct tmpfs_dirent *b);
60
61RB_GENERATE(tmpfs_dirtree, tmpfs_dirent, rb_node, tmpfs_dirtree_compare);
62
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63
64/* --------------------------------------------------------------------- */
65
66/*
67 * Allocates a new node of type 'type' inside the 'tmp' mount point, with
68 * its owner set to 'uid', its group to 'gid' and its mode set to 'mode',
69 * using the credentials of the process 'p'.
70 *
71 * If the node type is set to 'VDIR', then the parent parameter must point
72 * to the parent directory of the node being created. It may only be NULL
73 * while allocating the root node.
74 *
75 * If the node type is set to 'VBLK' or 'VCHR', then the rdev parameter
76 * specifies the device the node represents.
77 *
78 * If the node type is set to 'VLNK', then the parameter target specifies
79 * the file name of the target file for the symbolic link that is being
80 * created.
81 *
82 * Note that new nodes are retrieved from the available list if it has
83 * items or, if it is empty, from the node pool as long as there is enough
84 * space to create them.
85 *
86 * Returns zero on success or an appropriate error code on failure.
87 */
88int
89tmpfs_alloc_node(struct tmpfs_mount *tmp, enum vtype type,
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MD
90 uid_t uid, gid_t gid, mode_t mode,
91 char *target, int rmajor, int rminor,
92 struct tmpfs_node **node)
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93{
94 struct tmpfs_node *nnode;
95 struct timespec ts;
96 udev_t rdev;
97
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98 KKASSERT(IFF(type == VLNK, target != NULL));
99 KKASSERT(IFF(type == VBLK || type == VCHR, rmajor != VNOVAL));
100
c01f27eb 101 if (tmp->tm_nodes_inuse >= tmp->tm_nodes_max)
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102 return (ENOSPC);
103
881dac8b
VS
104 nnode = objcache_get(tmp->tm_node_pool, M_WAITOK | M_NULLOK);
105 if (nnode == NULL)
106 return (ENOSPC);
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107
108 /* Generic initialization. */
109 nnode->tn_type = type;
110 vfs_timestamp(&ts);
111 nnode->tn_ctime = nnode->tn_mtime = nnode->tn_atime
112 = ts.tv_sec;
113 nnode->tn_ctimensec = nnode->tn_mtimensec = nnode->tn_atimensec
114 = ts.tv_nsec;
115 nnode->tn_uid = uid;
116 nnode->tn_gid = gid;
117 nnode->tn_mode = mode;
f7db522f 118 nnode->tn_id = tmpfs_fetch_ino(tmp);
12a5de0e 119 nnode->tn_advlock.init_done = 0;
6e0c5aab 120 KKASSERT(nnode->tn_links == 0);
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MD
121
122 /* Type-specific initialization. */
123 switch (nnode->tn_type) {
124 case VBLK:
125 case VCHR:
126 rdev = makeudev(rmajor, rminor);
127 if (rdev == NOUDEV) {
42f6f6b1 128 objcache_put(tmp->tm_node_pool, nnode);
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129 return(EINVAL);
130 }
131 nnode->tn_rdev = rdev;
132 break;
133
134 case VDIR:
29ca4fd6 135 RB_INIT(&nnode->tn_dir.tn_dirtree);
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136 nnode->tn_dir.tn_readdir_lastn = 0;
137 nnode->tn_dir.tn_readdir_lastp = NULL;
7a2de9a4 138 nnode->tn_size = 0;
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MD
139 break;
140
141 case VFIFO:
142 /* FALLTHROUGH */
143 case VSOCK:
144 break;
145
146 case VLNK:
9fc94b5f 147 nnode->tn_size = strlen(target);
d00cd01c 148 nnode->tn_link = kmalloc(nnode->tn_size + 1, tmp->tm_name_zone,
42f6f6b1
VS
149 M_WAITOK | M_NULLOK);
150 if (nnode->tn_link == NULL) {
151 objcache_put(tmp->tm_node_pool, nnode);
152 return (ENOSPC);
153 }
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154 bcopy(target, nnode->tn_link, nnode->tn_size);
155 nnode->tn_link[nnode->tn_size] = '\0';
156 break;
157
158 case VREG:
159 nnode->tn_reg.tn_aobj =
5a648714 160 swap_pager_alloc(NULL, 0, VM_PROT_DEFAULT, 0);
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161 nnode->tn_reg.tn_aobj_pages = 0;
162 nnode->tn_size = 0;
163 break;
164
165 default:
166 panic("tmpfs_alloc_node: type %p %d", nnode, (int)nnode->tn_type);
167 }
168
169 TMPFS_NODE_LOCK(nnode);
7a2de9a4 170 TMPFS_LOCK(tmp);
0786baf1 171 LIST_INSERT_HEAD(&tmp->tm_nodes_used, nnode, tn_entries);
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172 tmp->tm_nodes_inuse++;
173 TMPFS_UNLOCK(tmp);
174 TMPFS_NODE_UNLOCK(nnode);
175
176 *node = nnode;
177 return 0;
178}
179
180/* --------------------------------------------------------------------- */
181
182/*
183 * Destroys the node pointed to by node from the file system 'tmp'.
184 * If the node does not belong to the given mount point, the results are
185 * unpredicted.
186 *
187 * If the node references a directory; no entries are allowed because
188 * their removal could need a recursive algorithm, something forbidden in
189 * kernel space. Furthermore, there is not need to provide such
190 * functionality (recursive removal) because the only primitives offered
191 * to the user are the removal of empty directories and the deletion of
192 * individual files.
193 *
194 * Note that nodes are not really deleted; in fact, when a node has been
195 * allocated, it cannot be deleted during the whole life of the file
196 * system. Instead, they are moved to the available list and remain there
197 * until reused.
198 */
199void
200tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
201{
29ffeb28 202 vm_pindex_t pages = 0;
7a2de9a4 203
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204#ifdef INVARIANTS
205 TMPFS_ASSERT_ELOCKED(node);
206 KKASSERT(node->tn_vnode == NULL);
207 KKASSERT((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0);
208#endif
209
7a2de9a4 210 TMPFS_LOCK(tmp);
0786baf1 211 LIST_REMOVE(node, tn_entries);
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212 tmp->tm_nodes_inuse--;
213 TMPFS_UNLOCK(tmp);
0786baf1 214 TMPFS_NODE_UNLOCK(node);
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215
216 switch (node->tn_type) {
217 case VNON:
218 /* Do not do anything. VNON is provided to let the
219 * allocation routine clean itself easily by avoiding
220 * duplicating code in it. */
221 /* FALLTHROUGH */
222 case VBLK:
223 /* FALLTHROUGH */
224 case VCHR:
225 /* FALLTHROUGH */
226 break;
227 case VDIR:
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228 /*
229 * The parent link can be NULL if this is the root
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230 * node or if it is a directory node that was rmdir'd.
231 *
232 * XXX what if node is a directory which still contains
233 * directory entries (e.g. due to a forced umount) ?
0786baf1 234 */
7a2de9a4 235 node->tn_size = 0;
6e0c5aab 236 KKASSERT(node->tn_dir.tn_parent == NULL);
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237
238 /*
239 * If the root node is being destroyed don't leave a
240 * dangling pointer in tmpfs_mount.
241 */
242 if (node == tmp->tm_root)
243 tmp->tm_root = NULL;
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244 break;
245 case VFIFO:
246 /* FALLTHROUGH */
247 case VSOCK:
248 break;
249
250 case VLNK:
d00cd01c 251 kfree(node->tn_link, tmp->tm_name_zone);
9fc94b5f 252 node->tn_link = NULL;
2706b587 253 node->tn_size = 0;
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254 break;
255
256 case VREG:
257 if (node->tn_reg.tn_aobj != NULL)
f96f2f39 258 vm_object_deallocate(node->tn_reg.tn_aobj);
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259 node->tn_reg.tn_aobj = NULL;
260 pages = node->tn_reg.tn_aobj_pages;
261 break;
262
263 default:
264 panic("tmpfs_free_node: type %p %d", node, (int)node->tn_type);
265 }
266
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267 /*
268 * Clean up fields for the next allocation. The objcache only ctors
269 * new allocations.
270 */
271 tmpfs_node_ctor(node, NULL, 0);
7a2de9a4 272 objcache_put(tmp->tm_node_pool, node);
0786baf1 273 /* node is now invalid */
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274
275 TMPFS_LOCK(tmp);
276 tmp->tm_pages_used -= pages;
277 TMPFS_UNLOCK(tmp);
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278}
279
280/* --------------------------------------------------------------------- */
281
282/*
283 * Allocates a new directory entry for the node node with a name of name.
284 * The new directory entry is returned in *de.
285 *
286 * The link count of node is increased by one to reflect the new object
287 * referencing it.
288 *
289 * Returns zero on success or an appropriate error code on failure.
290 */
291int
292tmpfs_alloc_dirent(struct tmpfs_mount *tmp, struct tmpfs_node *node,
293 const char *name, uint16_t len, struct tmpfs_dirent **de)
294{
295 struct tmpfs_dirent *nde;
296
42f6f6b1 297 nde = objcache_get(tmp->tm_dirent_pool, M_WAITOK);
d00cd01c 298 nde->td_name = kmalloc(len + 1, tmp->tm_name_zone, M_WAITOK | M_NULLOK);
42f6f6b1
VS
299 if (nde->td_name == NULL) {
300 objcache_put(tmp->tm_dirent_pool, nde);
301 *de = NULL;
302 return (ENOSPC);
303 }
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304 nde->td_namelen = len;
305 bcopy(name, nde->td_name, len);
306 nde->td_name[len] = '\0';
307
308 nde->td_node = node;
309
310 TMPFS_NODE_LOCK(node);
311 node->tn_links++;
312 TMPFS_NODE_UNLOCK(node);
313
314 *de = nde;
315
316 return 0;
317}
318
319/* --------------------------------------------------------------------- */
320
321/*
322 * Frees a directory entry. It is the caller's responsibility to destroy
323 * the node referenced by it if needed.
324 *
325 * The link count of node is decreased by one to reflect the removal of an
326 * object that referenced it. This only happens if 'node_exists' is true;
327 * otherwise the function will not access the node referred to by the
328 * directory entry, as it may already have been released from the outside.
329 */
330void
0786baf1 331tmpfs_free_dirent(struct tmpfs_mount *tmp, struct tmpfs_dirent *de)
7a2de9a4 332{
0786baf1 333 struct tmpfs_node *node;
7a2de9a4 334
0786baf1 335 node = de->td_node;
7a2de9a4 336
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MD
337 TMPFS_NODE_LOCK(node);
338 TMPFS_ASSERT_ELOCKED(node);
339 KKASSERT(node->tn_links > 0);
340 node->tn_links--;
341 TMPFS_NODE_UNLOCK(node);
7a2de9a4 342
d00cd01c 343 kfree(de->td_name, tmp->tm_name_zone);
0786baf1 344 de->td_namelen = 0;
9fc94b5f 345 de->td_name = NULL;
0786baf1 346 de->td_node = NULL;
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347 objcache_put(tmp->tm_dirent_pool, de);
348}
349
350/* --------------------------------------------------------------------- */
351
352/*
353 * Allocates a new vnode for the node node or returns a new reference to
354 * an existing one if the node had already a vnode referencing it. The
355 * resulting locked vnode is returned in *vpp.
356 *
357 * Returns zero on success or an appropriate error code on failure.
358 */
359int
360tmpfs_alloc_vp(struct mount *mp, struct tmpfs_node *node, int lkflag,
2706b587 361 struct vnode **vpp)
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MD
362{
363 int error = 0;
364 struct vnode *vp;
365
366loop:
2706b587
MD
367 /*
368 * Interlocked extraction from node. This can race many things.
369 * We have to get a soft reference on the vnode while we hold
370 * the node locked, then acquire it properly and check for races.
371 */
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MD
372 TMPFS_NODE_LOCK(node);
373 if ((vp = node->tn_vnode) != NULL) {
374 KKASSERT((node->tn_vpstate & TMPFS_VNODE_DOOMED) == 0);
2706b587 375 vhold_interlocked(vp);
7a2de9a4 376 TMPFS_NODE_UNLOCK(node);
7a2de9a4 377
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MD
378 if (vget(vp, lkflag | LK_EXCLUSIVE) != 0) {
379 vdrop(vp);
380 goto loop;
381 }
382 if (node->tn_vnode != vp) {
7a2de9a4 383 vput(vp);
2706b587 384 vdrop(vp);
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MD
385 goto loop;
386 }
2706b587 387 vdrop(vp);
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388 goto out;
389 }
2706b587 390 /* vp is NULL */
7a2de9a4 391
0786baf1
MD
392 /*
393 * This should never happen.
394 */
395 if (node->tn_vpstate & TMPFS_VNODE_DOOMED) {
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MD
396 TMPFS_NODE_UNLOCK(node);
397 error = ENOENT;
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MD
398 goto out;
399 }
400
401 /*
2706b587
MD
402 * Interlock against other calls to tmpfs_alloc_vp() trying to
403 * allocate and assign a vp to node.
7a2de9a4
MD
404 */
405 if (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) {
406 node->tn_vpstate |= TMPFS_VNODE_WANT;
2706b587
MD
407 error = tsleep(&node->tn_vpstate, PINTERLOCKED | PCATCH,
408 "tmpfs_alloc_vp", 0);
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MD
409 TMPFS_NODE_UNLOCK(node);
410 if (error)
411 return error;
7a2de9a4 412 goto loop;
2706b587
MD
413 }
414 node->tn_vpstate |= TMPFS_VNODE_ALLOCATING;
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MD
415 TMPFS_NODE_UNLOCK(node);
416
2706b587
MD
417 /*
418 * Allocate a new vnode (may block). The ALLOCATING flag should
419 * prevent a race against someone else assigning node->tn_vnode.
420 */
7a2de9a4
MD
421 error = getnewvnode(VT_TMPFS, mp, &vp, VLKTIMEOUT, LK_CANRECURSE);
422 if (error != 0)
423 goto unlock;
7a2de9a4 424
2706b587
MD
425 KKASSERT(node->tn_vnode == NULL);
426 KKASSERT(vp != NULL);
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MD
427 vp->v_data = node;
428 vp->v_type = node->tn_type;
429
430 /* Type-specific initialization. */
431 switch (node->tn_type) {
432 case VBLK:
433 /* FALLTHROUGH */
434 case VCHR:
435 /* FALLTHROUGH */
436 case VSOCK:
437 break;
438 case VREG:
b0d18f7d 439 vinitvmio(vp, node->tn_size, BMASK, -1);
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MD
440 break;
441 case VLNK:
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MD
442 break;
443 case VFIFO:
444 vp->v_ops = &mp->mnt_vn_fifo_ops;
445 break;
446 case VDIR:
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MD
447 break;
448
449 default:
450 panic("tmpfs_alloc_vp: type %p %d", node, (int)node->tn_type);
451 }
452
453 insmntque(vp, mp);
454
455unlock:
456 TMPFS_NODE_LOCK(node);
457
458 KKASSERT(node->tn_vpstate & TMPFS_VNODE_ALLOCATING);
459 node->tn_vpstate &= ~TMPFS_VNODE_ALLOCATING;
460 node->tn_vnode = vp;
461
462 if (node->tn_vpstate & TMPFS_VNODE_WANT) {
463 node->tn_vpstate &= ~TMPFS_VNODE_WANT;
464 TMPFS_NODE_UNLOCK(node);
2706b587
MD
465 wakeup(&node->tn_vpstate);
466 } else {
7a2de9a4 467 TMPFS_NODE_UNLOCK(node);
2706b587 468 }
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MD
469
470out:
471 *vpp = vp;
472
473 KKASSERT(IFF(error == 0, *vpp != NULL && vn_islocked(*vpp)));
474#ifdef INVARIANTS
475 TMPFS_NODE_LOCK(node);
476 KKASSERT(*vpp == node->tn_vnode);
477 TMPFS_NODE_UNLOCK(node);
478#endif
479
480 return error;
481}
482
483/* --------------------------------------------------------------------- */
484
485/*
486 * Destroys the association between the vnode vp and the node it
487 * references.
488 */
489void
490tmpfs_free_vp(struct vnode *vp)
491{
492 struct tmpfs_node *node;
493
494 node = VP_TO_TMPFS_NODE(vp);
495
496 TMPFS_NODE_LOCK(node);
497 KKASSERT(lockcount(TMPFS_NODE_MTX(node)) > 0);
498 node->tn_vnode = NULL;
499 TMPFS_NODE_UNLOCK(node);
500 vp->v_data = NULL;
501}
502
503/* --------------------------------------------------------------------- */
504
505/*
506 * Allocates a new file of type 'type' and adds it to the parent directory
507 * 'dvp'; this addition is done using the component name given in 'cnp'.
508 * The ownership of the new file is automatically assigned based on the
509 * credentials of the caller (through 'cnp'), the group is set based on
510 * the parent directory and the mode is determined from the 'vap' argument.
511 * If successful, *vpp holds a vnode to the newly created file and zero
512 * is returned. Otherwise *vpp is NULL and the function returns an
513 * appropriate error code.
514 */
515int
516tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap,
2706b587 517 struct namecache *ncp, struct ucred *cred, char *target)
7a2de9a4
MD
518{
519 int error;
520 struct tmpfs_dirent *de;
521 struct tmpfs_mount *tmp;
522 struct tmpfs_node *dnode;
523 struct tmpfs_node *node;
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MD
524
525 tmp = VFS_TO_TMPFS(dvp->v_mount);
526 dnode = VP_TO_TMPFS_DIR(dvp);
527 *vpp = NULL;
528
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MD
529 /*
530 * If the directory was removed but a process was CD'd into it,
531 * we do not allow any more file/dir creation within it. Otherwise
532 * we will lose track of it.
533 */
534 KKASSERT(dnode->tn_type == VDIR);
535 if (dnode != tmp->tm_root && dnode->tn_dir.tn_parent == NULL)
536 return ENOENT;
7a2de9a4 537
6e0c5aab
MD
538 /*
539 * Make sure the link count does not overflow.
540 */
541 if (vap->va_type == VDIR && dnode->tn_links >= LINK_MAX)
542 return EMLINK;
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MD
543
544 /* Allocate a node that represents the new file. */
545 error = tmpfs_alloc_node(tmp, vap->va_type, cred->cr_uid,
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MD
546 dnode->tn_gid, vap->va_mode, target,
547 vap->va_rmajor, vap->va_rminor, &node);
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MD
548 if (error != 0)
549 return error;
0786baf1 550 TMPFS_NODE_LOCK(node);
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MD
551
552 /* Allocate a directory entry that points to the new file. */
0786baf1 553 error = tmpfs_alloc_dirent(tmp, node, ncp->nc_name, ncp->nc_nlen, &de);
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MD
554 if (error != 0) {
555 tmpfs_free_node(tmp, node);
0786baf1 556 /* eats node lock */
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MD
557 return error;
558 }
559
560 /* Allocate a vnode for the new file. */
561 error = tmpfs_alloc_vp(dvp->v_mount, node, LK_EXCLUSIVE, vpp);
562 if (error != 0) {
0786baf1 563 tmpfs_free_dirent(tmp, de);
7a2de9a4 564 tmpfs_free_node(tmp, node);
0786baf1 565 /* eats node lock */
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MD
566 return error;
567 }
568
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MD
569 /*
570 * Now that all required items are allocated, we can proceed to
7a2de9a4 571 * insert the new node into the directory, an operation that
6e0c5aab
MD
572 * cannot fail.
573 */
22d3b394 574 tmpfs_dir_attach(dnode, de);
0786baf1 575 TMPFS_NODE_UNLOCK(node);
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MD
576
577 return error;
578}
579
580/* --------------------------------------------------------------------- */
581
582/*
583 * Attaches the directory entry de to the directory represented by vp.
584 * Note that this does not change the link count of the node pointed by
585 * the directory entry, as this is done by tmpfs_alloc_dirent.
586 */
587void
22d3b394 588tmpfs_dir_attach(struct tmpfs_node *dnode, struct tmpfs_dirent *de)
7a2de9a4 589{
6e0c5aab
MD
590 struct tmpfs_node *node = de->td_node;
591
22d3b394 592 TMPFS_NODE_LOCK(dnode);
6e0c5aab
MD
593 if (node && node->tn_type == VDIR) {
594 TMPFS_NODE_LOCK(node);
595 ++node->tn_links;
596 node->tn_status |= TMPFS_NODE_CHANGED;
597 node->tn_dir.tn_parent = dnode;
598 ++dnode->tn_links;
599 TMPFS_NODE_UNLOCK(node);
600 }
29ca4fd6 601 RB_INSERT(tmpfs_dirtree, &dnode->tn_dir.tn_dirtree, de);
7a2de9a4 602 dnode->tn_size += sizeof(struct tmpfs_dirent);
22d3b394
MD
603 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
604 TMPFS_NODE_MODIFIED;
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MD
605 TMPFS_NODE_UNLOCK(dnode);
606}
607
608/* --------------------------------------------------------------------- */
609
610/*
611 * Detaches the directory entry de from the directory represented by vp.
612 * Note that this does not change the link count of the node pointed by
613 * the directory entry, as this is done by tmpfs_free_dirent.
614 */
615void
22d3b394 616tmpfs_dir_detach(struct tmpfs_node *dnode, struct tmpfs_dirent *de)
7a2de9a4 617{
6e0c5aab
MD
618 struct tmpfs_node *node = de->td_node;
619
22d3b394 620 TMPFS_NODE_LOCK(dnode);
7a2de9a4
MD
621 if (dnode->tn_dir.tn_readdir_lastp == de) {
622 dnode->tn_dir.tn_readdir_lastn = 0;
623 dnode->tn_dir.tn_readdir_lastp = NULL;
624 }
29ca4fd6 625 RB_REMOVE(tmpfs_dirtree, &dnode->tn_dir.tn_dirtree, de);
7a2de9a4 626 dnode->tn_size -= sizeof(struct tmpfs_dirent);
22d3b394
MD
627 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
628 TMPFS_NODE_MODIFIED;
7a2de9a4 629 TMPFS_NODE_UNLOCK(dnode);
6e0c5aab
MD
630
631 /*
632 * Clean out the tn_parent pointer immediately when removing a
633 * directory.
634 *
635 * Removal of the parent linkage also cleans out the extra tn_links
636 * count we had on both node and dnode.
637 *
638 * node can be NULL (typ during a forced umount), in which case
639 * the mount code is dealing with the linkages from a linked list
640 * scan.
641 */
642 if (node && node->tn_type == VDIR && node->tn_dir.tn_parent) {
643 TMPFS_NODE_LOCK(dnode);
644 TMPFS_NODE_LOCK(node);
645 KKASSERT(node->tn_dir.tn_parent == dnode);
646 dnode->tn_links--;
647 node->tn_links--;
648 node->tn_dir.tn_parent = NULL;
649 TMPFS_NODE_UNLOCK(node);
650 TMPFS_NODE_UNLOCK(dnode);
651 }
7a2de9a4
MD
652}
653
654/* --------------------------------------------------------------------- */
655
656/*
657 * Looks for a directory entry in the directory represented by node.
658 * 'ncp' describes the name of the entry to look for. Note that the .
659 * and .. components are not allowed as they do not physically exist
660 * within directories.
661 *
662 * Returns a pointer to the entry when found, otherwise NULL.
663 */
664struct tmpfs_dirent *
665tmpfs_dir_lookup(struct tmpfs_node *node, struct tmpfs_node *f,
6e0c5aab 666 struct namecache *ncp)
7a2de9a4 667{
7a2de9a4
MD
668 struct tmpfs_dirent *de;
669 int len = ncp->nc_nlen;
29ca4fd6
JH
670 struct tmpfs_dirent wanted;
671
672 wanted.td_namelen = len;
673 wanted.td_name = ncp->nc_name;
7a2de9a4
MD
674
675 TMPFS_VALIDATE_DIR(node);
676
29ca4fd6
JH
677 de = RB_FIND(tmpfs_dirtree, &node->tn_dir.tn_dirtree, &wanted);
678
679 KKASSERT(f == NULL || f == de->td_node);
7a2de9a4
MD
680
681 TMPFS_NODE_LOCK(node);
682 node->tn_status |= TMPFS_NODE_ACCESSED;
683 TMPFS_NODE_UNLOCK(node);
684
9fc94b5f 685 return de;
7a2de9a4
MD
686}
687
688/* --------------------------------------------------------------------- */
689
690/*
691 * Helper function for tmpfs_readdir. Creates a '.' entry for the given
692 * directory and returns it in the uio space. The function returns 0
693 * on success, -1 if there was not enough space in the uio structure to
694 * hold the directory entry or an appropriate error code if another
695 * error happens.
696 */
697int
698tmpfs_dir_getdotdent(struct tmpfs_node *node, struct uio *uio)
699{
700 int error;
701 struct dirent dent;
702 int dirsize;
703
704 TMPFS_VALIDATE_DIR(node);
705 KKASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOT);
706
707 dent.d_ino = node->tn_id;
708 dent.d_type = DT_DIR;
709 dent.d_namlen = 1;
710 dent.d_name[0] = '.';
711 dent.d_name[1] = '\0';
712 dirsize = _DIRENT_DIRSIZ(&dent);
713
714 if (dirsize > uio->uio_resid)
715 error = -1;
716 else {
717 error = uiomove((caddr_t)&dent, dirsize, uio);
718 if (error == 0)
719 uio->uio_offset = TMPFS_DIRCOOKIE_DOTDOT;
720 }
721
2706b587 722 TMPFS_NODE_LOCK(node);
7a2de9a4 723 node->tn_status |= TMPFS_NODE_ACCESSED;
2706b587 724 TMPFS_NODE_UNLOCK(node);
7a2de9a4
MD
725
726 return error;
727}
728
729/* --------------------------------------------------------------------- */
730
731/*
732 * Helper function for tmpfs_readdir. Creates a '..' entry for the given
733 * directory and returns it in the uio space. The function returns 0
734 * on success, -1 if there was not enough space in the uio structure to
735 * hold the directory entry or an appropriate error code if another
736 * error happens.
737 */
738int
22d3b394
MD
739tmpfs_dir_getdotdotdent(struct tmpfs_mount *tmp, struct tmpfs_node *node,
740 struct uio *uio)
7a2de9a4
MD
741{
742 int error;
743 struct dirent dent;
744 int dirsize;
745
746 TMPFS_VALIDATE_DIR(node);
747 KKASSERT(uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT);
748
22d3b394
MD
749 if (node->tn_dir.tn_parent) {
750 TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
751 dent.d_ino = node->tn_dir.tn_parent->tn_id;
752 TMPFS_NODE_UNLOCK(node->tn_dir.tn_parent);
753 } else {
754 dent.d_ino = tmp->tm_root->tn_id;
7a2de9a4
MD
755 }
756
7a2de9a4
MD
757 dent.d_type = DT_DIR;
758 dent.d_namlen = 2;
759 dent.d_name[0] = '.';
760 dent.d_name[1] = '.';
761 dent.d_name[2] = '\0';
762 dirsize = _DIRENT_DIRSIZ(&dent);
763
764 if (dirsize > uio->uio_resid)
765 error = -1;
766 else {
767 error = uiomove((caddr_t)&dent, dirsize, uio);
768 if (error == 0) {
769 struct tmpfs_dirent *de;
770
29ca4fd6 771 de = RB_MIN(tmpfs_dirtree, &node->tn_dir.tn_dirtree);
7a2de9a4
MD
772 if (de == NULL)
773 uio->uio_offset = TMPFS_DIRCOOKIE_EOF;
774 else
775 uio->uio_offset = tmpfs_dircookie(de);
776 }
777 }
778
2706b587 779 TMPFS_NODE_LOCK(node);
7a2de9a4 780 node->tn_status |= TMPFS_NODE_ACCESSED;
2706b587 781 TMPFS_NODE_UNLOCK(node);
7a2de9a4
MD
782
783 return error;
784}
785
786/* --------------------------------------------------------------------- */
787
788/*
789 * Lookup a directory entry by its associated cookie.
790 */
791struct tmpfs_dirent *
792tmpfs_dir_lookupbycookie(struct tmpfs_node *node, off_t cookie)
793{
794 struct tmpfs_dirent *de;
795
796 if (cookie == node->tn_dir.tn_readdir_lastn &&
797 node->tn_dir.tn_readdir_lastp != NULL) {
798 return node->tn_dir.tn_readdir_lastp;
799 }
800
29ca4fd6 801 RB_FOREACH(de, tmpfs_dirtree, &node->tn_dir.tn_dirtree) {
7a2de9a4
MD
802 if (tmpfs_dircookie(de) == cookie) {
803 break;
804 }
805 }
806
807 return de;
808}
809
810/* --------------------------------------------------------------------- */
811
812/*
813 * Helper function for tmpfs_readdir. Returns as much directory entries
814 * as can fit in the uio space. The read starts at uio->uio_offset.
815 * The function returns 0 on success, -1 if there was not enough space
816 * in the uio structure to hold the directory entry or an appropriate
817 * error code if another error happens.
818 */
819int
820tmpfs_dir_getdents(struct tmpfs_node *node, struct uio *uio, off_t *cntp)
821{
822 int error;
823 off_t startcookie;
824 struct tmpfs_dirent *de;
825
826 TMPFS_VALIDATE_DIR(node);
827
828 /* Locate the first directory entry we have to return. We have cached
829 * the last readdir in the node, so use those values if appropriate.
830 * Otherwise do a linear scan to find the requested entry. */
831 startcookie = uio->uio_offset;
832 KKASSERT(startcookie != TMPFS_DIRCOOKIE_DOT);
833 KKASSERT(startcookie != TMPFS_DIRCOOKIE_DOTDOT);
834 if (startcookie == TMPFS_DIRCOOKIE_EOF) {
835 return 0;
836 } else {
837 de = tmpfs_dir_lookupbycookie(node, startcookie);
838 }
839 if (de == NULL) {
840 return EINVAL;
841 }
842
843 /* Read as much entries as possible; i.e., until we reach the end of
844 * the directory or we exhaust uio space. */
845 do {
846 struct dirent d;
847 int reclen;
848
849 /* Create a dirent structure representing the current
850 * tmpfs_node and fill it. */
851 d.d_ino = de->td_node->tn_id;
852 switch (de->td_node->tn_type) {
853 case VBLK:
854 d.d_type = DT_BLK;
855 break;
856
857 case VCHR:
858 d.d_type = DT_CHR;
859 break;
860
861 case VDIR:
862 d.d_type = DT_DIR;
863 break;
864
865 case VFIFO:
866 d.d_type = DT_FIFO;
867 break;
868
869 case VLNK:
870 d.d_type = DT_LNK;
871 break;
872
873 case VREG:
874 d.d_type = DT_REG;
875 break;
876
877 case VSOCK:
878 d.d_type = DT_SOCK;
879 break;
880
881 default:
882 panic("tmpfs_dir_getdents: type %p %d",
883 de->td_node, (int)de->td_node->tn_type);
884 }
885 d.d_namlen = de->td_namelen;
886 KKASSERT(de->td_namelen < sizeof(d.d_name));
887 bcopy(de->td_name, d.d_name, d.d_namlen);
888 d.d_name[d.d_namlen] = '\0';
889 reclen = _DIRENT_RECLEN(d.d_namlen);
890
891 /* Stop reading if the directory entry we are treating is
892 * bigger than the amount of data that can be returned. */
893 if (reclen > uio->uio_resid) {
894 error = -1;
895 break;
896 }
897
898 /* Copy the new dirent structure into the output buffer and
899 * advance pointers. */
900 error = uiomove((caddr_t)&d, reclen, uio);
901
902 (*cntp)++;
29ca4fd6 903 de = RB_NEXT(tmpfs_dirtree, node->tn_dir.tn_dirtree, de);
7a2de9a4
MD
904 } while (error == 0 && uio->uio_resid > 0 && de != NULL);
905
906 /* Update the offset and cache. */
907 if (de == NULL) {
908 uio->uio_offset = TMPFS_DIRCOOKIE_EOF;
909 node->tn_dir.tn_readdir_lastn = 0;
910 node->tn_dir.tn_readdir_lastp = NULL;
911 } else {
912 node->tn_dir.tn_readdir_lastn = uio->uio_offset = tmpfs_dircookie(de);
913 node->tn_dir.tn_readdir_lastp = de;
914 }
915 node->tn_status |= TMPFS_NODE_ACCESSED;
916
917 return error;
918}
919
920/* --------------------------------------------------------------------- */
921
922/*
923 * Resizes the aobj associated to the regular file pointed to by vp to
924 * the size newsize. 'vp' must point to a vnode that represents a regular
925 * file. 'newsize' must be positive.
926 *
927 * pass trivial as 1 when buf content will be overwritten, otherwise set 0
928 * to be zero filled.
929 *
930 * Returns zero on success or an appropriate error code on failure.
931 */
932int
933tmpfs_reg_resize(struct vnode *vp, off_t newsize, int trivial)
934{
935 int error;
29ffeb28 936 vm_pindex_t newpages, oldpages;
7a2de9a4
MD
937 struct tmpfs_mount *tmp;
938 struct tmpfs_node *node;
939 off_t oldsize;
7a2de9a4
MD
940
941#ifdef INVARIANTS
942 KKASSERT(vp->v_type == VREG);
943 KKASSERT(newsize >= 0);
944#endif
945
946 node = VP_TO_TMPFS_NODE(vp);
947 tmp = VFS_TO_TMPFS(vp->v_mount);
948
949 /* Convert the old and new sizes to the number of pages needed to
950 * store them. It may happen that we do not need to do anything
951 * because the last allocated page can accommodate the change on
952 * its own. */
953 oldsize = node->tn_size;
29ffeb28 954 oldpages = round_page64(oldsize) / PAGE_SIZE;
7a2de9a4 955 KKASSERT(oldpages == node->tn_reg.tn_aobj_pages);
29ffeb28 956 newpages = round_page64(newsize) / PAGE_SIZE;
7a2de9a4
MD
957
958 if (newpages > oldpages &&
29ffeb28 959 tmp->tm_pages_used + newpages - oldpages > tmp->tm_pages_max) {
7a2de9a4
MD
960 error = ENOSPC;
961 goto out;
962 }
963
964 TMPFS_LOCK(tmp);
965 tmp->tm_pages_used += (newpages - oldpages);
966 TMPFS_UNLOCK(tmp);
967
968 TMPFS_NODE_LOCK(node);
969 node->tn_reg.tn_aobj_pages = newpages;
970 node->tn_size = newsize;
971 TMPFS_NODE_UNLOCK(node);
972
9fc94b5f
MD
973 /*
974 * When adjusting the vnode filesize and its VM object we must
975 * also adjust our backing VM object (aobj). The blocksize
976 * used must match the block sized we use for the buffer cache.
22d3b394
MD
977 *
978 * The backing VM object contains no VM pages, only swap
979 * assignments.
9fc94b5f
MD
980 */
981 if (newsize < oldsize) {
982 vm_pindex_t osize;
22d3b394 983 vm_pindex_t nsize;
9fc94b5f
MD
984 vm_object_t aobj;
985
753df37e 986 error = nvtruncbuf(vp, newsize, BSIZE, -1, 0);
9fc94b5f
MD
987 aobj = node->tn_reg.tn_aobj;
988 if (aobj) {
989 osize = aobj->size;
22d3b394
MD
990 nsize = vp->v_object->size;
991 if (nsize < osize) {
9fc94b5f 992 aobj->size = osize;
22d3b394
MD
993 swap_pager_freespace(aobj, nsize,
994 osize - nsize);
9fc94b5f
MD
995 }
996 }
997 } else {
998 vm_object_t aobj;
999
1000 error = nvextendbuf(vp, oldsize, newsize, BSIZE, BSIZE,
7a2de9a4 1001 -1, -1, trivial);
9fc94b5f
MD
1002 aobj = node->tn_reg.tn_aobj;
1003 if (aobj)
1004 aobj->size = vp->v_object->size;
1005 }
7a2de9a4
MD
1006
1007out:
1008 return error;
1009}
1010
1011/* --------------------------------------------------------------------- */
1012
1013/*
1014 * Change flags of the given vnode.
1015 * Caller should execute tmpfs_update on vp after a successful execution.
1016 * The vnode must be locked on entry and remain locked on exit.
1017 */
1018int
80ae59d7 1019tmpfs_chflags(struct vnode *vp, int vaflags, struct ucred *cred)
7a2de9a4
MD
1020{
1021 int error;
1022 struct tmpfs_node *node;
80ae59d7 1023 int flags;
7a2de9a4
MD
1024
1025 KKASSERT(vn_islocked(vp));
1026
1027 node = VP_TO_TMPFS_NODE(vp);
80ae59d7 1028 flags = node->tn_flags;
7a2de9a4
MD
1029
1030 /* Disallow this operation if the file system is mounted read-only. */
1031 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1032 return EROFS;
80ae59d7 1033 error = vop_helper_setattr_flags(&flags, vaflags, node->tn_uid, cred);
7a2de9a4 1034
7a2de9a4
MD
1035 /*
1036 * Unprivileged processes are not permitted to unset system
1037 * flags, or modify flags if any system flags are set.
d4623db3
MD
1038 *
1039 * Silently enforce SF_NOCACHE on the root tmpfs vnode so
1040 * tmpfs data is not double-cached by swapcache.
7a2de9a4 1041 */
80ae59d7
MD
1042 if (error == 0) {
1043 TMPFS_NODE_LOCK(node);
1044 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
1045 if (vp->v_flag & VROOT)
1046 flags |= SF_NOCACHE;
1047 node->tn_flags = flags;
1048 } else {
1049 if (node->tn_flags & (SF_NOUNLINK | SF_IMMUTABLE |
1050 SF_APPEND) ||
1051 (flags & UF_SETTABLE) != flags) {
1052 error = EPERM;
1053 } else {
1054 node->tn_flags &= SF_SETTABLE;
1055 node->tn_flags |= (flags & UF_SETTABLE);
1056 }
7a2de9a4 1057 }
80ae59d7
MD
1058 node->tn_status |= TMPFS_NODE_CHANGED;
1059 TMPFS_NODE_UNLOCK(node);
7a2de9a4 1060 }
7a2de9a4
MD
1061
1062 KKASSERT(vn_islocked(vp));
1063
80ae59d7 1064 return error;
7a2de9a4
MD
1065}
1066
1067/* --------------------------------------------------------------------- */
1068
1069/*
1070 * Change access mode on the given vnode.
1071 * Caller should execute tmpfs_update on vp after a successful execution.
1072 * The vnode must be locked on entry and remain locked on exit.
1073 */
1074int
80ae59d7 1075tmpfs_chmod(struct vnode *vp, mode_t vamode, struct ucred *cred)
7a2de9a4 1076{
7a2de9a4 1077 struct tmpfs_node *node;
80ae59d7
MD
1078 mode_t cur_mode;
1079 int error;
7a2de9a4
MD
1080
1081 KKASSERT(vn_islocked(vp));
1082
1083 node = VP_TO_TMPFS_NODE(vp);
1084
1085 /* Disallow this operation if the file system is mounted read-only. */
1086 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1087 return EROFS;
1088
1089 /* Immutable or append-only files cannot be modified, either. */
1090 if (node->tn_flags & (IMMUTABLE | APPEND))
1091 return EPERM;
1092
80ae59d7
MD
1093 cur_mode = node->tn_mode;
1094 error = vop_helper_chmod(vp, vamode, cred, node->tn_uid, node->tn_gid,
1095 &cur_mode);
7a2de9a4 1096
80ae59d7
MD
1097 if (error == 0 &&
1098 (node->tn_mode & ALLPERMS) != (cur_mode & ALLPERMS)) {
1099 TMPFS_NODE_LOCK(node);
1100 node->tn_mode &= ~ALLPERMS;
1101 node->tn_mode |= cur_mode & ALLPERMS;
7a2de9a4 1102
80ae59d7
MD
1103 node->tn_status |= TMPFS_NODE_CHANGED;
1104 TMPFS_NODE_UNLOCK(node);
7a2de9a4
MD
1105 }
1106
7a2de9a4
MD
1107 KKASSERT(vn_islocked(vp));
1108
1109 return 0;
1110}
1111
1112/* --------------------------------------------------------------------- */
1113
1114/*
1115 * Change ownership of the given vnode. At least one of uid or gid must
1116 * be different than VNOVAL. If one is set to that value, the attribute
1117 * is unchanged.
1118 * Caller should execute tmpfs_update on vp after a successful execution.
1119 * The vnode must be locked on entry and remain locked on exit.
1120 */
1121int
1122tmpfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred)
1123{
bd48f29c
MD
1124 mode_t cur_mode;
1125 uid_t cur_uid;
1126 gid_t cur_gid;
7a2de9a4 1127 struct tmpfs_node *node;
bd48f29c 1128 int error;
7a2de9a4
MD
1129
1130 KKASSERT(vn_islocked(vp));
7a2de9a4
MD
1131 node = VP_TO_TMPFS_NODE(vp);
1132
7a2de9a4
MD
1133 /* Disallow this operation if the file system is mounted read-only. */
1134 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1135 return EROFS;
1136
1137 /* Immutable or append-only files cannot be modified, either. */
1138 if (node->tn_flags & (IMMUTABLE | APPEND))
1139 return EPERM;
1140
bd48f29c
MD
1141 cur_uid = node->tn_uid;
1142 cur_gid = node->tn_gid;
1143 cur_mode = node->tn_mode;
1144 error = vop_helper_chown(vp, uid, gid, cred,
1145 &cur_uid, &cur_gid, &cur_mode);
1146
1147 if (error == 0) {
1148 TMPFS_NODE_LOCK(node);
1149 if (cur_uid != node->tn_uid ||
1150 cur_gid != node->tn_gid ||
1151 cur_mode != node->tn_mode) {
3b9337bb
YT
1152 node->tn_uid = cur_uid;
1153 node->tn_gid = cur_gid;
bd48f29c
MD
1154 node->tn_mode = cur_mode;
1155 node->tn_status |= TMPFS_NODE_CHANGED;
7a2de9a4 1156 }
bd48f29c 1157 TMPFS_NODE_UNLOCK(node);
7a2de9a4 1158 }
7a2de9a4 1159
bd48f29c 1160 return error;
7a2de9a4
MD
1161}
1162
1163/* --------------------------------------------------------------------- */
1164
1165/*
1166 * Change size of the given vnode.
1167 * Caller should execute tmpfs_update on vp after a successful execution.
1168 * The vnode must be locked on entry and remain locked on exit.
1169 */
1170int
1171tmpfs_chsize(struct vnode *vp, u_quad_t size, struct ucred *cred)
1172{
1173 int error;
1174 struct tmpfs_node *node;
1175
1176 KKASSERT(vn_islocked(vp));
1177
1178 node = VP_TO_TMPFS_NODE(vp);
1179
1180 /* Decide whether this is a valid operation based on the file type. */
1181 error = 0;
1182 switch (vp->v_type) {
1183 case VDIR:
1184 return EISDIR;
1185
1186 case VREG:
1187 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1188 return EROFS;
1189 break;
1190
1191 case VBLK:
1192 /* FALLTHROUGH */
1193 case VCHR:
1194 /* FALLTHROUGH */
1195 case VFIFO:
1196 /* Allow modifications of special files even if in the file
1197 * system is mounted read-only (we are not modifying the
1198 * files themselves, but the objects they represent). */
1199 return 0;
1200
1201 default:
1202 /* Anything else is unsupported. */
1203 return EOPNOTSUPP;
1204 }
1205
1206 /* Immutable or append-only files cannot be modified, either. */
1207 if (node->tn_flags & (IMMUTABLE | APPEND))
1208 return EPERM;
1209
1210 error = tmpfs_truncate(vp, size);
1211 /* tmpfs_truncate will raise the NOTE_EXTEND and NOTE_ATTRIB kevents
1212 * for us, as will update tn_status; no need to do that here. */
1213
1214 KKASSERT(vn_islocked(vp));
1215
1216 return error;
1217}
1218
1219/* --------------------------------------------------------------------- */
1220
1221/*
1222 * Change access and modification times of the given vnode.
1223 * Caller should execute tmpfs_update on vp after a successful execution.
1224 * The vnode must be locked on entry and remain locked on exit.
1225 */
1226int
1227tmpfs_chtimes(struct vnode *vp, struct timespec *atime, struct timespec *mtime,
1228 int vaflags, struct ucred *cred)
1229{
7a2de9a4 1230 struct tmpfs_node *node;
7a2de9a4
MD
1231
1232 KKASSERT(vn_islocked(vp));
1233
1234 node = VP_TO_TMPFS_NODE(vp);
1235
1236 /* Disallow this operation if the file system is mounted read-only. */
1237 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1238 return EROFS;
1239
1240 /* Immutable or append-only files cannot be modified, either. */
1241 if (node->tn_flags & (IMMUTABLE | APPEND))
1242 return EPERM;
1243
7a2de9a4
MD
1244 TMPFS_NODE_LOCK(node);
1245 if (atime->tv_sec != VNOVAL && atime->tv_nsec != VNOVAL)
1246 node->tn_status |= TMPFS_NODE_ACCESSED;
1247
1248 if (mtime->tv_sec != VNOVAL && mtime->tv_nsec != VNOVAL)
1249 node->tn_status |= TMPFS_NODE_MODIFIED;
1250
1251 TMPFS_NODE_UNLOCK(node);
1252
1253 tmpfs_itimes(vp, atime, mtime);
1254
1255 KKASSERT(vn_islocked(vp));
1256
1257 return 0;
1258}
1259
1260/* --------------------------------------------------------------------- */
1261/* Sync timestamps */
1262void
1263tmpfs_itimes(struct vnode *vp, const struct timespec *acc,
1264 const struct timespec *mod)
1265{
1266 struct tmpfs_node *node;
1267 struct timespec now;
1268
1269 node = VP_TO_TMPFS_NODE(vp);
1270
1271 if ((node->tn_status & (TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
1272 TMPFS_NODE_CHANGED)) == 0)
1273 return;
1274
1275 vfs_timestamp(&now);
1276
1277 TMPFS_NODE_LOCK(node);
1278 if (node->tn_status & TMPFS_NODE_ACCESSED) {
1279 if (acc == NULL)
1280 acc = &now;
1281 node->tn_atime = acc->tv_sec;
1282 node->tn_atimensec = acc->tv_nsec;
1283 }
1284 if (node->tn_status & TMPFS_NODE_MODIFIED) {
1285 if (mod == NULL)
1286 mod = &now;
1287 node->tn_mtime = mod->tv_sec;
1288 node->tn_mtimensec = mod->tv_nsec;
1289 }
1290 if (node->tn_status & TMPFS_NODE_CHANGED) {
1291 node->tn_ctime = now.tv_sec;
1292 node->tn_ctimensec = now.tv_nsec;
1293 }
1294 node->tn_status &=
1295 ~(TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED);
1296 TMPFS_NODE_UNLOCK(node);
1297}
1298
1299/* --------------------------------------------------------------------- */
1300
1301void
1302tmpfs_update(struct vnode *vp)
1303{
1304
1305 tmpfs_itimes(vp, NULL, NULL);
1306}
1307
1308/* --------------------------------------------------------------------- */
1309
1310int
1311tmpfs_truncate(struct vnode *vp, off_t length)
1312{
1313 int error;
1314 struct tmpfs_node *node;
1315
1316 node = VP_TO_TMPFS_NODE(vp);
1317
1318 if (length < 0) {
1319 error = EINVAL;
1320 goto out;
1321 }
1322
1323 if (node->tn_size == length) {
1324 error = 0;
1325 goto out;
1326 }
1327
1328 if (length > VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
1329 return (EFBIG);
1330
1331
1332 error = tmpfs_reg_resize(vp, length, 1);
1333
1334 if (error == 0) {
1335 TMPFS_NODE_LOCK(node);
1336 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1337 TMPFS_NODE_UNLOCK(node);
1338 }
1339
1340out:
1341 tmpfs_update(vp);
1342
1343 return error;
1344}
1345
1346/* --------------------------------------------------------------------- */
1347
1348static ino_t
f7db522f 1349tmpfs_fetch_ino(struct tmpfs_mount *tmp)
7a2de9a4 1350{
f7db522f 1351 ino_t ret;
7a2de9a4 1352
f7db522f 1353 ret = tmp->tm_ino++;
7a2de9a4 1354
f7db522f 1355 return (ret);
7a2de9a4 1356}
29ca4fd6
JH
1357
1358static int
1359tmpfs_dirtree_compare(struct tmpfs_dirent *a, struct tmpfs_dirent *b)
1360{
1361 if (a->td_namelen > b->td_namelen)
1362 return 1;
1363 else if (a->td_namelen < b->td_namelen)
1364 return -1;
1365 else
1366 return strncmp(a->td_name, b->td_name, a->td_namelen);
1367}