source: mainline/uspace/srv/fs/tmpfs/tmpfs_ops.c@ e27cf669

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since e27cf669 was d42976c, checked in by Jakub Jermar <jakub@…>, 15 years ago

Merge fixes from the file system branch.
In particular, prevent mounting the same TMPFS file system instance twice for
now as the proper support will require some tweaking.
  • Property mode set to 100644
File size: 17.4 KB
Line 
1/*
2 * Copyright (c) 2008 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup fs
30 * @{
31 */
32
33/**
34 * @file tmpfs_ops.c
35 * @brief Implementation of VFS operations for the TMPFS file system
36 * server.
37 */
38
39#include "tmpfs.h"
40#include "../../vfs/vfs.h"
41#include <ipc/ipc.h>
42#include <async.h>
43#include <errno.h>
44#include <atomic.h>
45#include <stdlib.h>
46#include <string.h>
47#include <stdio.h>
48#include <assert.h>
49#include <sys/types.h>
50#include <adt/hash_table.h>
51#include <as.h>
52#include <libfs.h>
53
54#define min(a, b) ((a) < (b) ? (a) : (b))
55#define max(a, b) ((a) > (b) ? (a) : (b))
56
57#define NODES_BUCKETS 256
58
59/** All root nodes have index 0. */
60#define TMPFS_SOME_ROOT 0
61/** Global counter for assigning node indices. Shared by all instances. */
62fs_index_t tmpfs_next_index = 1;
63
64/*
65 * Implementation of the libfs interface.
66 */
67
68/* Forward declarations of static functions. */
69static int tmpfs_match(fs_node_t **, fs_node_t *, const char *);
70static int tmpfs_node_get(fs_node_t **, dev_handle_t, fs_index_t);
71static int tmpfs_node_open(fs_node_t *);
72static int tmpfs_node_put(fs_node_t *);
73static int tmpfs_create_node(fs_node_t **, dev_handle_t, int);
74static int tmpfs_destroy_node(fs_node_t *);
75static int tmpfs_link_node(fs_node_t *, fs_node_t *, const char *);
76static int tmpfs_unlink_node(fs_node_t *, fs_node_t *, const char *);
77
78/* Implementation of helper functions. */
79static int tmpfs_root_get(fs_node_t **rfn, dev_handle_t dev_handle)
80{
81 return tmpfs_node_get(rfn, dev_handle, TMPFS_SOME_ROOT);
82}
83
84static int tmpfs_has_children(bool *has_children, fs_node_t *fn)
85{
86 *has_children = !list_empty(&TMPFS_NODE(fn)->cs_head);
87 return EOK;
88}
89
90static fs_index_t tmpfs_index_get(fs_node_t *fn)
91{
92 return TMPFS_NODE(fn)->index;
93}
94
95static size_t tmpfs_size_get(fs_node_t *fn)
96{
97 return TMPFS_NODE(fn)->size;
98}
99
100static unsigned tmpfs_lnkcnt_get(fs_node_t *fn)
101{
102 return TMPFS_NODE(fn)->lnkcnt;
103}
104
105static char tmpfs_plb_get_char(unsigned pos)
106{
107 return tmpfs_reg.plb_ro[pos % PLB_SIZE];
108}
109
110static bool tmpfs_is_directory(fs_node_t *fn)
111{
112 return TMPFS_NODE(fn)->type == TMPFS_DIRECTORY;
113}
114
115static bool tmpfs_is_file(fs_node_t *fn)
116{
117 return TMPFS_NODE(fn)->type == TMPFS_FILE;
118}
119
120static dev_handle_t tmpfs_device_get(fs_node_t *fn)
121{
122 return 0;
123}
124
125/** libfs operations */
126libfs_ops_t tmpfs_libfs_ops = {
127 .root_get = tmpfs_root_get,
128 .match = tmpfs_match,
129 .node_get = tmpfs_node_get,
130 .node_open = tmpfs_node_open,
131 .node_put = tmpfs_node_put,
132 .create = tmpfs_create_node,
133 .destroy = tmpfs_destroy_node,
134 .link = tmpfs_link_node,
135 .unlink = tmpfs_unlink_node,
136 .has_children = tmpfs_has_children,
137 .index_get = tmpfs_index_get,
138 .size_get = tmpfs_size_get,
139 .lnkcnt_get = tmpfs_lnkcnt_get,
140 .plb_get_char = tmpfs_plb_get_char,
141 .is_directory = tmpfs_is_directory,
142 .is_file = tmpfs_is_file,
143 .device_get = tmpfs_device_get
144};
145
146/** Hash table of all TMPFS nodes. */
147hash_table_t nodes;
148
149#define NODES_KEY_DEV 0
150#define NODES_KEY_INDEX 1
151
152/* Implementation of hash table interface for the nodes hash table. */
153static hash_index_t nodes_hash(unsigned long key[])
154{
155 return key[NODES_KEY_INDEX] % NODES_BUCKETS;
156}
157
158static int nodes_compare(unsigned long key[], hash_count_t keys, link_t *item)
159{
160 tmpfs_node_t *nodep = hash_table_get_instance(item, tmpfs_node_t,
161 nh_link);
162
163 switch (keys) {
164 case 1:
165 return (nodep->dev_handle == key[NODES_KEY_DEV]);
166 case 2:
167 return ((nodep->dev_handle == key[NODES_KEY_DEV]) &&
168 (nodep->index == key[NODES_KEY_INDEX]));
169 default:
170 assert((keys == 1) || (keys == 2));
171 }
172
173 return 0;
174}
175
176static void nodes_remove_callback(link_t *item)
177{
178 tmpfs_node_t *nodep = hash_table_get_instance(item, tmpfs_node_t,
179 nh_link);
180
181 while (!list_empty(&nodep->cs_head)) {
182 tmpfs_dentry_t *dentryp = list_get_instance(nodep->cs_head.next,
183 tmpfs_dentry_t, link);
184
185 assert(nodep->type == TMPFS_DIRECTORY);
186 list_remove(&dentryp->link);
187 free(dentryp);
188 }
189
190 if (nodep->data) {
191 assert(nodep->type == TMPFS_FILE);
192 free(nodep->data);
193 }
194 free(nodep->bp);
195 free(nodep);
196}
197
198/** TMPFS nodes hash table operations. */
199hash_table_operations_t nodes_ops = {
200 .hash = nodes_hash,
201 .compare = nodes_compare,
202 .remove_callback = nodes_remove_callback
203};
204
205static void tmpfs_node_initialize(tmpfs_node_t *nodep)
206{
207 nodep->bp = NULL;
208 nodep->index = 0;
209 nodep->dev_handle = 0;
210 nodep->type = TMPFS_NONE;
211 nodep->lnkcnt = 0;
212 nodep->size = 0;
213 nodep->data = NULL;
214 link_initialize(&nodep->nh_link);
215 list_initialize(&nodep->cs_head);
216}
217
218static void tmpfs_dentry_initialize(tmpfs_dentry_t *dentryp)
219{
220 link_initialize(&dentryp->link);
221 dentryp->name = NULL;
222 dentryp->node = NULL;
223}
224
225bool tmpfs_init(void)
226{
227 if (!hash_table_create(&nodes, NODES_BUCKETS, 2, &nodes_ops))
228 return false;
229
230 return true;
231}
232
233static bool tmpfs_instance_init(dev_handle_t dev_handle)
234{
235 fs_node_t *rfn;
236 int rc;
237
238 rc = tmpfs_create_node(&rfn, dev_handle, L_DIRECTORY);
239 if (rc != EOK || !rfn)
240 return false;
241 TMPFS_NODE(rfn)->lnkcnt = 0; /* FS root is not linked */
242 return true;
243}
244
245static void tmpfs_instance_done(dev_handle_t dev_handle)
246{
247 unsigned long key[] = {
248 [NODES_KEY_DEV] = dev_handle
249 };
250 /*
251 * Here we are making use of one special feature of our hash table
252 * implementation, which allows to remove more items based on a partial
253 * key match. In the following, we are going to remove all nodes
254 * matching our device handle. The nodes_remove_callback() function will
255 * take care of resource deallocation.
256 */
257 hash_table_remove(&nodes, key, 1);
258}
259
260int tmpfs_match(fs_node_t **rfn, fs_node_t *pfn, const char *component)
261{
262 tmpfs_node_t *parentp = TMPFS_NODE(pfn);
263 link_t *lnk;
264
265 for (lnk = parentp->cs_head.next; lnk != &parentp->cs_head;
266 lnk = lnk->next) {
267 tmpfs_dentry_t *dentryp;
268 dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
269 if (!str_cmp(dentryp->name, component)) {
270 *rfn = FS_NODE(dentryp->node);
271 return EOK;
272 }
273 }
274
275 *rfn = NULL;
276 return EOK;
277}
278
279int tmpfs_node_get(fs_node_t **rfn, dev_handle_t dev_handle, fs_index_t index)
280{
281 unsigned long key[] = {
282 [NODES_KEY_DEV] = dev_handle,
283 [NODES_KEY_INDEX] = index
284 };
285 link_t *lnk = hash_table_find(&nodes, key);
286 if (lnk) {
287 tmpfs_node_t *nodep;
288 nodep = hash_table_get_instance(lnk, tmpfs_node_t, nh_link);
289 *rfn = FS_NODE(nodep);
290 } else {
291 *rfn = NULL;
292 }
293 return EOK;
294}
295
296int tmpfs_node_open(fs_node_t *fn)
297{
298 /* nothing to do */
299 return EOK;
300}
301
302int tmpfs_node_put(fs_node_t *fn)
303{
304 /* nothing to do */
305 return EOK;
306}
307
308int tmpfs_create_node(fs_node_t **rfn, dev_handle_t dev_handle, int lflag)
309{
310 fs_node_t *rootfn;
311 int rc;
312
313 assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY));
314
315 tmpfs_node_t *nodep = malloc(sizeof(tmpfs_node_t));
316 if (!nodep)
317 return ENOMEM;
318 tmpfs_node_initialize(nodep);
319 nodep->bp = malloc(sizeof(fs_node_t));
320 if (!nodep->bp) {
321 free(nodep);
322 return ENOMEM;
323 }
324 fs_node_initialize(nodep->bp);
325 nodep->bp->data = nodep; /* link the FS and TMPFS nodes */
326
327 rc = tmpfs_root_get(&rootfn, dev_handle);
328 assert(rc == EOK);
329 if (!rootfn)
330 nodep->index = TMPFS_SOME_ROOT;
331 else
332 nodep->index = tmpfs_next_index++;
333 nodep->dev_handle = dev_handle;
334 if (lflag & L_DIRECTORY)
335 nodep->type = TMPFS_DIRECTORY;
336 else
337 nodep->type = TMPFS_FILE;
338
339 /* Insert the new node into the nodes hash table. */
340 unsigned long key[] = {
341 [NODES_KEY_DEV] = nodep->dev_handle,
342 [NODES_KEY_INDEX] = nodep->index
343 };
344 hash_table_insert(&nodes, key, &nodep->nh_link);
345 *rfn = FS_NODE(nodep);
346 return EOK;
347}
348
349int tmpfs_destroy_node(fs_node_t *fn)
350{
351 tmpfs_node_t *nodep = TMPFS_NODE(fn);
352
353 assert(!nodep->lnkcnt);
354 assert(list_empty(&nodep->cs_head));
355
356 unsigned long key[] = {
357 [NODES_KEY_DEV] = nodep->dev_handle,
358 [NODES_KEY_INDEX] = nodep->index
359 };
360 hash_table_remove(&nodes, key, 2);
361
362 /*
363 * The nodes_remove_callback() function takes care of the actual
364 * resource deallocation.
365 */
366 return EOK;
367}
368
369int tmpfs_link_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
370{
371 tmpfs_node_t *parentp = TMPFS_NODE(pfn);
372 tmpfs_node_t *childp = TMPFS_NODE(cfn);
373 tmpfs_dentry_t *dentryp;
374 link_t *lnk;
375
376 assert(parentp->type == TMPFS_DIRECTORY);
377
378 /* Check for duplicit entries. */
379 for (lnk = parentp->cs_head.next; lnk != &parentp->cs_head;
380 lnk = lnk->next) {
381 dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
382 if (!str_cmp(dentryp->name, nm))
383 return EEXIST;
384 }
385
386 /* Allocate and initialize the dentry. */
387 dentryp = malloc(sizeof(tmpfs_dentry_t));
388 if (!dentryp)
389 return ENOMEM;
390 tmpfs_dentry_initialize(dentryp);
391
392 /* Populate and link the new dentry. */
393 size_t size = str_size(nm);
394 dentryp->name = malloc(size + 1);
395 if (!dentryp->name) {
396 free(dentryp);
397 return ENOMEM;
398 }
399 str_cpy(dentryp->name, size + 1, nm);
400 dentryp->node = childp;
401 childp->lnkcnt++;
402 list_append(&dentryp->link, &parentp->cs_head);
403
404 return EOK;
405}
406
407int tmpfs_unlink_node(fs_node_t *pfn, fs_node_t *cfn, const char *nm)
408{
409 tmpfs_node_t *parentp = TMPFS_NODE(pfn);
410 tmpfs_node_t *childp = NULL;
411 tmpfs_dentry_t *dentryp;
412 link_t *lnk;
413
414 if (!parentp)
415 return EBUSY;
416
417 for (lnk = parentp->cs_head.next; lnk != &parentp->cs_head;
418 lnk = lnk->next) {
419 dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
420 if (!str_cmp(dentryp->name, nm)) {
421 childp = dentryp->node;
422 assert(FS_NODE(childp) == cfn);
423 break;
424 }
425 }
426
427 if (!childp)
428 return ENOENT;
429
430 if ((childp->lnkcnt == 1) && !list_empty(&childp->cs_head))
431 return ENOTEMPTY;
432
433 list_remove(&dentryp->link);
434 free(dentryp);
435 childp->lnkcnt--;
436
437 return EOK;
438}
439
440void tmpfs_mounted(ipc_callid_t rid, ipc_call_t *request)
441{
442 dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
443 fs_node_t *rootfn;
444 int rc;
445
446 /* Accept the mount options. */
447 char *opts;
448 rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL);
449 if (rc != EOK) {
450 ipc_answer_0(rid, rc);
451 return;
452 }
453
454 /* Check if this device is not already mounted. */
455 rc = tmpfs_root_get(&rootfn, dev_handle);
456 if ((rc == EOK) && (rootfn)) {
457 (void) tmpfs_node_put(rootfn);
458 free(opts);
459 ipc_answer_0(rid, EEXIST);
460 return;
461 }
462
463 /* Initialize TMPFS instance. */
464 if (!tmpfs_instance_init(dev_handle)) {
465 free(opts);
466 ipc_answer_0(rid, ENOMEM);
467 return;
468 }
469
470 rc = tmpfs_root_get(&rootfn, dev_handle);
471 assert(rc == EOK);
472 tmpfs_node_t *rootp = TMPFS_NODE(rootfn);
473 if (str_cmp(opts, "restore") == 0) {
474 if (tmpfs_restore(dev_handle))
475 ipc_answer_3(rid, EOK, rootp->index, rootp->size,
476 rootp->lnkcnt);
477 else
478 ipc_answer_0(rid, ELIMIT);
479 } else {
480 ipc_answer_3(rid, EOK, rootp->index, rootp->size,
481 rootp->lnkcnt);
482 }
483 free(opts);
484}
485
486void tmpfs_mount(ipc_callid_t rid, ipc_call_t *request)
487{
488 libfs_mount(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
489}
490
491void tmpfs_unmounted(ipc_callid_t rid, ipc_call_t *request)
492{
493 dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
494
495 tmpfs_instance_done(dev_handle);
496 ipc_answer_0(rid, EOK);
497}
498
499void tmpfs_unmount(ipc_callid_t rid, ipc_call_t *request)
500{
501 libfs_unmount(&tmpfs_libfs_ops, rid, request);
502}
503
504void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request)
505{
506 libfs_lookup(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
507}
508
509void tmpfs_read(ipc_callid_t rid, ipc_call_t *request)
510{
511 dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
512 fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
513 off_t pos = (off_t)IPC_GET_ARG3(*request);
514
515 /*
516 * Lookup the respective TMPFS node.
517 */
518 link_t *hlp;
519 unsigned long key[] = {
520 [NODES_KEY_DEV] = dev_handle,
521 [NODES_KEY_INDEX] = index
522 };
523 hlp = hash_table_find(&nodes, key);
524 if (!hlp) {
525 ipc_answer_0(rid, ENOENT);
526 return;
527 }
528 tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
529 nh_link);
530
531 /*
532 * Receive the read request.
533 */
534 ipc_callid_t callid;
535 size_t size;
536 if (!async_data_read_receive(&callid, &size)) {
537 ipc_answer_0(callid, EINVAL);
538 ipc_answer_0(rid, EINVAL);
539 return;
540 }
541
542 size_t bytes;
543 if (nodep->type == TMPFS_FILE) {
544 bytes = max(0, min(nodep->size - pos, size));
545 (void) async_data_read_finalize(callid, nodep->data + pos,
546 bytes);
547 } else {
548 tmpfs_dentry_t *dentryp;
549 link_t *lnk;
550 int i;
551
552 assert(nodep->type == TMPFS_DIRECTORY);
553
554 /*
555 * Yes, we really use O(n) algorithm here.
556 * If it bothers someone, it could be fixed by introducing a
557 * hash table.
558 */
559 for (i = 0, lnk = nodep->cs_head.next;
560 i < pos && lnk != &nodep->cs_head;
561 i++, lnk = lnk->next)
562 ;
563
564 if (lnk == &nodep->cs_head) {
565 ipc_answer_0(callid, ENOENT);
566 ipc_answer_1(rid, ENOENT, 0);
567 return;
568 }
569
570 dentryp = list_get_instance(lnk, tmpfs_dentry_t, link);
571
572 (void) async_data_read_finalize(callid, dentryp->name,
573 str_size(dentryp->name) + 1);
574 bytes = 1;
575 }
576
577 /*
578 * Answer the VFS_READ call.
579 */
580 ipc_answer_1(rid, EOK, bytes);
581}
582
583void tmpfs_write(ipc_callid_t rid, ipc_call_t *request)
584{
585 dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
586 fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
587 off_t pos = (off_t)IPC_GET_ARG3(*request);
588
589 /*
590 * Lookup the respective TMPFS node.
591 */
592 link_t *hlp;
593 unsigned long key[] = {
594 [NODES_KEY_DEV] = dev_handle,
595 [NODES_KEY_INDEX] = index
596 };
597 hlp = hash_table_find(&nodes, key);
598 if (!hlp) {
599 ipc_answer_0(rid, ENOENT);
600 return;
601 }
602 tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
603 nh_link);
604
605 /*
606 * Receive the write request.
607 */
608 ipc_callid_t callid;
609 size_t size;
610 if (!async_data_write_receive(&callid, &size)) {
611 ipc_answer_0(callid, EINVAL);
612 ipc_answer_0(rid, EINVAL);
613 return;
614 }
615
616 /*
617 * Check whether the file needs to grow.
618 */
619 if (pos + size <= nodep->size) {
620 /* The file size is not changing. */
621 (void) async_data_write_finalize(callid, nodep->data + pos, size);
622 ipc_answer_2(rid, EOK, size, nodep->size);
623 return;
624 }
625 size_t delta = (pos + size) - nodep->size;
626 /*
627 * At this point, we are deliberately extremely straightforward and
628 * simply realloc the contents of the file on every write that grows the
629 * file. In the end, the situation might not be as bad as it may look:
630 * our heap allocator can save us and just grow the block whenever
631 * possible.
632 */
633 void *newdata = realloc(nodep->data, nodep->size + delta);
634 if (!newdata) {
635 ipc_answer_0(callid, ENOMEM);
636 ipc_answer_2(rid, EOK, 0, nodep->size);
637 return;
638 }
639 /* Clear any newly allocated memory in order to emulate gaps. */
640 memset(newdata + nodep->size, 0, delta);
641 nodep->size += delta;
642 nodep->data = newdata;
643 (void) async_data_write_finalize(callid, nodep->data + pos, size);
644 ipc_answer_2(rid, EOK, size, nodep->size);
645}
646
647void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request)
648{
649 dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
650 fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
651 size_t size = (off_t)IPC_GET_ARG3(*request);
652
653 /*
654 * Lookup the respective TMPFS node.
655 */
656 link_t *hlp;
657 unsigned long key[] = {
658 [NODES_KEY_DEV] = dev_handle,
659 [NODES_KEY_INDEX] = index
660 };
661 hlp = hash_table_find(&nodes, key);
662 if (!hlp) {
663 ipc_answer_0(rid, ENOENT);
664 return;
665 }
666 tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
667 nh_link);
668
669 if (size == nodep->size) {
670 ipc_answer_0(rid, EOK);
671 return;
672 }
673
674 void *newdata = realloc(nodep->data, size);
675 if (!newdata) {
676 ipc_answer_0(rid, ENOMEM);
677 return;
678 }
679 if (size > nodep->size) {
680 size_t delta = size - nodep->size;
681 memset(newdata + nodep->size, 0, delta);
682 }
683 nodep->size = size;
684 nodep->data = newdata;
685 ipc_answer_0(rid, EOK);
686}
687
688void tmpfs_close(ipc_callid_t rid, ipc_call_t *request)
689{
690 ipc_answer_0(rid, EOK);
691}
692
693void tmpfs_destroy(ipc_callid_t rid, ipc_call_t *request)
694{
695 dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
696 fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
697 int rc;
698
699 link_t *hlp;
700 unsigned long key[] = {
701 [NODES_KEY_DEV] = dev_handle,
702 [NODES_KEY_INDEX] = index
703 };
704 hlp = hash_table_find(&nodes, key);
705 if (!hlp) {
706 ipc_answer_0(rid, ENOENT);
707 return;
708 }
709 tmpfs_node_t *nodep = hash_table_get_instance(hlp, tmpfs_node_t,
710 nh_link);
711 rc = tmpfs_destroy_node(FS_NODE(nodep));
712 ipc_answer_0(rid, rc);
713}
714
715void tmpfs_open_node(ipc_callid_t rid, ipc_call_t *request)
716{
717 libfs_open_node(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
718}
719
720void tmpfs_stat(ipc_callid_t rid, ipc_call_t *request)
721{
722 libfs_stat(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
723}
724
725void tmpfs_sync(ipc_callid_t rid, ipc_call_t *request)
726{
727 /* Dummy implementation */
728 ipc_answer_0(rid, EOK);
729}
730
731/**
732 * @}
733 */
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