blob: b501dc07f92224474f2cf1a27194e492429a019f [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Mike Marshall274dcf52015-07-17 10:38:13 -04002/*
3 * (C) 2001 Clemson University and The University of Chicago
4 *
5 * See COPYING in top-level directory.
6 */
7#include "protocol.h"
Mike Marshall575e9462015-12-04 12:56:14 -05008#include "orangefs-kernel.h"
9#include "orangefs-bufmap.h"
Mike Marshall274dcf52015-07-17 10:38:13 -040010
Al Viroea2c9c92016-02-13 21:01:21 -050011struct slot_map {
12 int c;
13 wait_queue_head_t q;
14 int count;
15 unsigned long *map;
16};
17
18static struct slot_map rw_map = {
19 .c = -1,
20 .q = __WAIT_QUEUE_HEAD_INITIALIZER(rw_map.q)
21};
22static struct slot_map readdir_map = {
23 .c = -1,
24 .q = __WAIT_QUEUE_HEAD_INITIALIZER(readdir_map.q)
25};
26
27
28static void install(struct slot_map *m, int count, unsigned long *map)
29{
30 spin_lock(&m->q.lock);
31 m->c = m->count = count;
32 m->map = map;
33 wake_up_all_locked(&m->q);
34 spin_unlock(&m->q.lock);
35}
36
37static void mark_killed(struct slot_map *m)
38{
39 spin_lock(&m->q.lock);
40 m->c -= m->count + 1;
41 spin_unlock(&m->q.lock);
42}
43
44static void run_down(struct slot_map *m)
45{
46 DEFINE_WAIT(wait);
47 spin_lock(&m->q.lock);
48 if (m->c != -1) {
49 for (;;) {
Ingo Molnar2055da92017-06-20 12:06:46 +020050 if (likely(list_empty(&wait.entry)))
Ingo Molnarac6424b2017-06-20 12:06:13 +020051 __add_wait_queue_entry_tail(&m->q, &wait);
Al Viroea2c9c92016-02-13 21:01:21 -050052 set_current_state(TASK_UNINTERRUPTIBLE);
53
54 if (m->c == -1)
55 break;
56
57 spin_unlock(&m->q.lock);
58 schedule();
59 spin_lock(&m->q.lock);
60 }
61 __remove_wait_queue(&m->q, &wait);
62 __set_current_state(TASK_RUNNING);
63 }
64 m->map = NULL;
65 spin_unlock(&m->q.lock);
66}
67
68static void put(struct slot_map *m, int slot)
69{
70 int v;
71 spin_lock(&m->q.lock);
72 __clear_bit(slot, m->map);
73 v = ++m->c;
David Reynoldsc2676ef2018-03-08 18:54:12 -050074 if (v > 0)
Al Viroea2c9c92016-02-13 21:01:21 -050075 wake_up_locked(&m->q);
David Reynoldsc2676ef2018-03-08 18:54:12 -050076 if (unlikely(v == -1)) /* finished dying */
Al Viroea2c9c92016-02-13 21:01:21 -050077 wake_up_all_locked(&m->q);
78 spin_unlock(&m->q.lock);
79}
80
81static int wait_for_free(struct slot_map *m)
82{
83 long left = slot_timeout_secs * HZ;
84 DEFINE_WAIT(wait);
85
86 do {
87 long n = left, t;
Ingo Molnar2055da92017-06-20 12:06:46 +020088 if (likely(list_empty(&wait.entry)))
Ingo Molnarac6424b2017-06-20 12:06:13 +020089 __add_wait_queue_entry_tail_exclusive(&m->q, &wait);
Al Viroea2c9c92016-02-13 21:01:21 -050090 set_current_state(TASK_INTERRUPTIBLE);
91
92 if (m->c > 0)
93 break;
94
95 if (m->c < 0) {
96 /* we are waiting for map to be installed */
97 /* it would better be there soon, or we go away */
98 if (n > ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS * HZ)
99 n = ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS * HZ;
100 }
101 spin_unlock(&m->q.lock);
102 t = schedule_timeout(n);
103 spin_lock(&m->q.lock);
104 if (unlikely(!t) && n != left && m->c < 0)
105 left = t;
106 else
107 left = t + (left - n);
Davidlohr Bueso08d405c2019-01-03 15:28:58 -0800108 if (signal_pending(current))
Al Viroea2c9c92016-02-13 21:01:21 -0500109 left = -EINTR;
110 } while (left > 0);
111
Ingo Molnar2055da92017-06-20 12:06:46 +0200112 if (!list_empty(&wait.entry))
113 list_del(&wait.entry);
Al Viroea2c9c92016-02-13 21:01:21 -0500114 else if (left <= 0 && waitqueue_active(&m->q))
115 __wake_up_locked_key(&m->q, TASK_INTERRUPTIBLE, NULL);
116 __set_current_state(TASK_RUNNING);
117
118 if (likely(left > 0))
119 return 0;
120
121 return left < 0 ? -EINTR : -ETIMEDOUT;
122}
123
124static int get(struct slot_map *m)
125{
126 int res = 0;
127 spin_lock(&m->q.lock);
128 if (unlikely(m->c <= 0))
129 res = wait_for_free(m);
130 if (likely(!res)) {
131 m->c--;
132 res = find_first_zero_bit(m->map, m->count);
133 __set_bit(res, m->map);
134 }
135 spin_unlock(&m->q.lock);
136 return res;
137}
Mike Marshall274dcf52015-07-17 10:38:13 -0400138
Martin Brandenburgbf89f582015-12-15 14:45:12 -0500139/* used to describe mapped buffers */
140struct orangefs_bufmap_desc {
Mike Marshall817e9b42018-06-01 12:19:45 -0400141 void __user *uaddr; /* user space address pointer */
Martin Brandenburgbf89f582015-12-15 14:45:12 -0500142 struct page **page_array; /* array of mapped pages */
143 int array_count; /* size of above arrays */
144 struct list_head list_link;
145};
146
Yi Liu8bb8aef2015-11-24 15:12:14 -0500147static struct orangefs_bufmap {
Mike Marshall274dcf52015-07-17 10:38:13 -0400148 int desc_size;
149 int desc_shift;
150 int desc_count;
151 int total_size;
152 int page_count;
153
154 struct page **page_array;
Yi Liu8bb8aef2015-11-24 15:12:14 -0500155 struct orangefs_bufmap_desc *desc_array;
Mike Marshall274dcf52015-07-17 10:38:13 -0400156
157 /* array to track usage of buffer descriptors */
Al Viroea2c9c92016-02-13 21:01:21 -0500158 unsigned long *buffer_index_array;
Mike Marshall274dcf52015-07-17 10:38:13 -0400159
160 /* array to track usage of buffer descriptors for readdir */
Al Viroea2c9c92016-02-13 21:01:21 -0500161#define N DIV_ROUND_UP(ORANGEFS_READDIR_DEFAULT_DESC_COUNT, BITS_PER_LONG)
162 unsigned long readdir_index_array[N];
163#undef N
Yi Liu8bb8aef2015-11-24 15:12:14 -0500164} *__orangefs_bufmap;
Mike Marshall274dcf52015-07-17 10:38:13 -0400165
Yi Liu8bb8aef2015-11-24 15:12:14 -0500166static DEFINE_SPINLOCK(orangefs_bufmap_lock);
Mike Marshall274dcf52015-07-17 10:38:13 -0400167
168static void
Yi Liu8bb8aef2015-11-24 15:12:14 -0500169orangefs_bufmap_unmap(struct orangefs_bufmap *bufmap)
Mike Marshall274dcf52015-07-17 10:38:13 -0400170{
John Hubbard0df55642020-05-22 20:59:09 -0700171 unpin_user_pages(bufmap->page_array, bufmap->page_count);
Mike Marshall274dcf52015-07-17 10:38:13 -0400172}
173
174static void
Yi Liu8bb8aef2015-11-24 15:12:14 -0500175orangefs_bufmap_free(struct orangefs_bufmap *bufmap)
Mike Marshall274dcf52015-07-17 10:38:13 -0400176{
177 kfree(bufmap->page_array);
178 kfree(bufmap->desc_array);
Christophe JAILLET40a74872021-12-27 19:09:18 +0100179 bitmap_free(bufmap->buffer_index_array);
Mike Marshall274dcf52015-07-17 10:38:13 -0400180 kfree(bufmap);
181}
182
Martin Brandenburgb09d10d2015-12-15 14:54:27 -0500183/*
Mike Marshall95f5f882018-05-11 17:11:48 -0400184 * XXX: Can the size and shift change while the caller gives up the
Martin Brandenburgb09d10d2015-12-15 14:54:27 -0500185 * XXX: lock between calling this and doing something useful?
186 */
187
Martin Brandenburg765a75b2015-12-15 14:48:17 -0500188int orangefs_bufmap_size_query(void)
Mike Marshall274dcf52015-07-17 10:38:13 -0400189{
Martin Brandenburgb09d10d2015-12-15 14:54:27 -0500190 struct orangefs_bufmap *bufmap;
191 int size = 0;
Al Viro17804182016-02-13 11:16:37 -0500192 spin_lock(&orangefs_bufmap_lock);
193 bufmap = __orangefs_bufmap;
194 if (bufmap)
Martin Brandenburgb09d10d2015-12-15 14:54:27 -0500195 size = bufmap->desc_size;
Al Viro17804182016-02-13 11:16:37 -0500196 spin_unlock(&orangefs_bufmap_lock);
Mike Marshall274dcf52015-07-17 10:38:13 -0400197 return size;
198}
199
Martin Brandenburg765a75b2015-12-15 14:48:17 -0500200int orangefs_bufmap_shift_query(void)
Mike Marshall274dcf52015-07-17 10:38:13 -0400201{
Martin Brandenburgb09d10d2015-12-15 14:54:27 -0500202 struct orangefs_bufmap *bufmap;
203 int shift = 0;
Al Viro17804182016-02-13 11:16:37 -0500204 spin_lock(&orangefs_bufmap_lock);
205 bufmap = __orangefs_bufmap;
206 if (bufmap)
Martin Brandenburgb09d10d2015-12-15 14:54:27 -0500207 shift = bufmap->desc_shift;
Al Viro17804182016-02-13 11:16:37 -0500208 spin_unlock(&orangefs_bufmap_lock);
Mike Marshall274dcf52015-07-17 10:38:13 -0400209 return shift;
210}
211
212static DECLARE_WAIT_QUEUE_HEAD(bufmap_waitq);
213static DECLARE_WAIT_QUEUE_HEAD(readdir_waitq);
214
Yi Liu8bb8aef2015-11-24 15:12:14 -0500215static struct orangefs_bufmap *
216orangefs_bufmap_alloc(struct ORANGEFS_dev_map_desc *user_desc)
Mike Marshall274dcf52015-07-17 10:38:13 -0400217{
Yi Liu8bb8aef2015-11-24 15:12:14 -0500218 struct orangefs_bufmap *bufmap;
Mike Marshall274dcf52015-07-17 10:38:13 -0400219
220 bufmap = kzalloc(sizeof(*bufmap), GFP_KERNEL);
221 if (!bufmap)
222 goto out;
223
Mike Marshall274dcf52015-07-17 10:38:13 -0400224 bufmap->total_size = user_desc->total_size;
225 bufmap->desc_count = user_desc->count;
226 bufmap->desc_size = user_desc->size;
227 bufmap->desc_shift = ilog2(bufmap->desc_size);
228
Christophe JAILLET40a74872021-12-27 19:09:18 +0100229 bufmap->buffer_index_array = bitmap_zalloc(bufmap->desc_count, GFP_KERNEL);
Markus Elfring07a25852017-08-17 21:00:07 +0200230 if (!bufmap->buffer_index_array)
Mike Marshall274dcf52015-07-17 10:38:13 -0400231 goto out_free_bufmap;
Mike Marshall274dcf52015-07-17 10:38:13 -0400232
233 bufmap->desc_array =
Yi Liu8bb8aef2015-11-24 15:12:14 -0500234 kcalloc(bufmap->desc_count, sizeof(struct orangefs_bufmap_desc),
Mike Marshall274dcf52015-07-17 10:38:13 -0400235 GFP_KERNEL);
Markus Elfring07a25852017-08-17 21:00:07 +0200236 if (!bufmap->desc_array)
Mike Marshall274dcf52015-07-17 10:38:13 -0400237 goto out_free_index_array;
Mike Marshall274dcf52015-07-17 10:38:13 -0400238
239 bufmap->page_count = bufmap->total_size / PAGE_SIZE;
240
241 /* allocate storage to track our page mappings */
242 bufmap->page_array =
243 kcalloc(bufmap->page_count, sizeof(struct page *), GFP_KERNEL);
244 if (!bufmap->page_array)
245 goto out_free_desc_array;
246
247 return bufmap;
248
249out_free_desc_array:
250 kfree(bufmap->desc_array);
251out_free_index_array:
Christophe JAILLET40a74872021-12-27 19:09:18 +0100252 bitmap_free(bufmap->buffer_index_array);
Mike Marshall274dcf52015-07-17 10:38:13 -0400253out_free_bufmap:
254 kfree(bufmap);
255out:
256 return NULL;
257}
258
259static int
Yi Liu8bb8aef2015-11-24 15:12:14 -0500260orangefs_bufmap_map(struct orangefs_bufmap *bufmap,
261 struct ORANGEFS_dev_map_desc *user_desc)
Mike Marshall274dcf52015-07-17 10:38:13 -0400262{
263 int pages_per_desc = bufmap->desc_size / PAGE_SIZE;
264 int offset = 0, ret, i;
265
266 /* map the pages */
John Hubbard0df55642020-05-22 20:59:09 -0700267 ret = pin_user_pages_fast((unsigned long)user_desc->ptr,
Ira Weiny73b01402019-05-13 17:17:11 -0700268 bufmap->page_count, FOLL_WRITE, bufmap->page_array);
Mike Marshall274dcf52015-07-17 10:38:13 -0400269
270 if (ret < 0)
271 return ret;
272
273 if (ret != bufmap->page_count) {
Yi Liu8bb8aef2015-11-24 15:12:14 -0500274 gossip_err("orangefs error: asked for %d pages, only got %d.\n",
Mike Marshall274dcf52015-07-17 10:38:13 -0400275 bufmap->page_count, ret);
276
277 for (i = 0; i < ret; i++) {
278 SetPageError(bufmap->page_array[i]);
John Hubbard0df55642020-05-22 20:59:09 -0700279 unpin_user_page(bufmap->page_array[i]);
Mike Marshall274dcf52015-07-17 10:38:13 -0400280 }
281 return -ENOMEM;
282 }
283
284 /*
285 * ideally we want to get kernel space pointers for each page, but
286 * we can't kmap that many pages at once if highmem is being used.
287 * so instead, we just kmap/kunmap the page address each time the
288 * kaddr is needed.
289 */
290 for (i = 0; i < bufmap->page_count; i++)
291 flush_dcache_page(bufmap->page_array[i]);
292
293 /* build a list of available descriptors */
294 for (offset = 0, i = 0; i < bufmap->desc_count; i++) {
295 bufmap->desc_array[i].page_array = &bufmap->page_array[offset];
296 bufmap->desc_array[i].array_count = pages_per_desc;
297 bufmap->desc_array[i].uaddr =
298 (user_desc->ptr + (i * pages_per_desc * PAGE_SIZE));
299 offset += pages_per_desc;
300 }
301
302 return 0;
303}
304
305/*
Yi Liu8bb8aef2015-11-24 15:12:14 -0500306 * orangefs_bufmap_initialize()
Mike Marshall274dcf52015-07-17 10:38:13 -0400307 *
308 * initializes the mapped buffer interface
309 *
310 * returns 0 on success, -errno on failure
311 */
Yi Liu8bb8aef2015-11-24 15:12:14 -0500312int orangefs_bufmap_initialize(struct ORANGEFS_dev_map_desc *user_desc)
Mike Marshall274dcf52015-07-17 10:38:13 -0400313{
Yi Liu8bb8aef2015-11-24 15:12:14 -0500314 struct orangefs_bufmap *bufmap;
Mike Marshall274dcf52015-07-17 10:38:13 -0400315 int ret = -EINVAL;
316
317 gossip_debug(GOSSIP_BUFMAP_DEBUG,
Yi Liu8bb8aef2015-11-24 15:12:14 -0500318 "orangefs_bufmap_initialize: called (ptr ("
Mike Marshall274dcf52015-07-17 10:38:13 -0400319 "%p) sz (%d) cnt(%d).\n",
320 user_desc->ptr,
321 user_desc->size,
322 user_desc->count);
323
Dan Carpentereb82fbc2017-01-21 08:04:45 +0300324 if (user_desc->total_size < 0 ||
325 user_desc->size < 0 ||
326 user_desc->count < 0)
327 goto out;
328
Mike Marshall274dcf52015-07-17 10:38:13 -0400329 /*
330 * sanity check alignment and size of buffer that caller wants to
331 * work with
332 */
333 if (PAGE_ALIGN((unsigned long)user_desc->ptr) !=
334 (unsigned long)user_desc->ptr) {
Yi Liu8bb8aef2015-11-24 15:12:14 -0500335 gossip_err("orangefs error: memory alignment (front). %p\n",
Mike Marshall274dcf52015-07-17 10:38:13 -0400336 user_desc->ptr);
337 goto out;
338 }
339
340 if (PAGE_ALIGN(((unsigned long)user_desc->ptr + user_desc->total_size))
341 != (unsigned long)(user_desc->ptr + user_desc->total_size)) {
Yi Liu8bb8aef2015-11-24 15:12:14 -0500342 gossip_err("orangefs error: memory alignment (back).(%p + %d)\n",
Mike Marshall274dcf52015-07-17 10:38:13 -0400343 user_desc->ptr,
344 user_desc->total_size);
345 goto out;
346 }
347
348 if (user_desc->total_size != (user_desc->size * user_desc->count)) {
Yi Liu8bb8aef2015-11-24 15:12:14 -0500349 gossip_err("orangefs error: user provided an oddly sized buffer: (%d, %d, %d)\n",
Mike Marshall274dcf52015-07-17 10:38:13 -0400350 user_desc->total_size,
351 user_desc->size,
352 user_desc->count);
353 goto out;
354 }
355
356 if ((user_desc->size % PAGE_SIZE) != 0) {
Yi Liu8bb8aef2015-11-24 15:12:14 -0500357 gossip_err("orangefs error: bufmap size not page size divisible (%d).\n",
Mike Marshall274dcf52015-07-17 10:38:13 -0400358 user_desc->size);
359 goto out;
360 }
361
362 ret = -ENOMEM;
Yi Liu8bb8aef2015-11-24 15:12:14 -0500363 bufmap = orangefs_bufmap_alloc(user_desc);
Mike Marshall274dcf52015-07-17 10:38:13 -0400364 if (!bufmap)
365 goto out;
366
Yi Liu8bb8aef2015-11-24 15:12:14 -0500367 ret = orangefs_bufmap_map(bufmap, user_desc);
Mike Marshall274dcf52015-07-17 10:38:13 -0400368 if (ret)
369 goto out_free_bufmap;
370
371
Yi Liu8bb8aef2015-11-24 15:12:14 -0500372 spin_lock(&orangefs_bufmap_lock);
373 if (__orangefs_bufmap) {
374 spin_unlock(&orangefs_bufmap_lock);
375 gossip_err("orangefs: error: bufmap already initialized.\n");
Al Viroea2c9c92016-02-13 21:01:21 -0500376 ret = -EINVAL;
Mike Marshall274dcf52015-07-17 10:38:13 -0400377 goto out_unmap_bufmap;
378 }
Yi Liu8bb8aef2015-11-24 15:12:14 -0500379 __orangefs_bufmap = bufmap;
Al Viroea2c9c92016-02-13 21:01:21 -0500380 install(&rw_map,
381 bufmap->desc_count,
382 bufmap->buffer_index_array);
383 install(&readdir_map,
384 ORANGEFS_READDIR_DEFAULT_DESC_COUNT,
385 bufmap->readdir_index_array);
Yi Liu8bb8aef2015-11-24 15:12:14 -0500386 spin_unlock(&orangefs_bufmap_lock);
Mike Marshall274dcf52015-07-17 10:38:13 -0400387
Mike Marshall274dcf52015-07-17 10:38:13 -0400388 gossip_debug(GOSSIP_BUFMAP_DEBUG,
Yi Liu8bb8aef2015-11-24 15:12:14 -0500389 "orangefs_bufmap_initialize: exiting normally\n");
Mike Marshall274dcf52015-07-17 10:38:13 -0400390 return 0;
391
392out_unmap_bufmap:
Yi Liu8bb8aef2015-11-24 15:12:14 -0500393 orangefs_bufmap_unmap(bufmap);
Mike Marshall274dcf52015-07-17 10:38:13 -0400394out_free_bufmap:
Yi Liu8bb8aef2015-11-24 15:12:14 -0500395 orangefs_bufmap_free(bufmap);
Mike Marshall274dcf52015-07-17 10:38:13 -0400396out:
397 return ret;
398}
399
400/*
Yi Liu8bb8aef2015-11-24 15:12:14 -0500401 * orangefs_bufmap_finalize()
Mike Marshall274dcf52015-07-17 10:38:13 -0400402 *
403 * shuts down the mapped buffer interface and releases any resources
404 * associated with it
405 *
406 * no return value
407 */
Yi Liu8bb8aef2015-11-24 15:12:14 -0500408void orangefs_bufmap_finalize(void)
Mike Marshall274dcf52015-07-17 10:38:13 -0400409{
Al Viroea2c9c92016-02-13 21:01:21 -0500410 struct orangefs_bufmap *bufmap = __orangefs_bufmap;
411 if (!bufmap)
412 return;
Yi Liu8bb8aef2015-11-24 15:12:14 -0500413 gossip_debug(GOSSIP_BUFMAP_DEBUG, "orangefs_bufmap_finalize: called\n");
Al Viroea2c9c92016-02-13 21:01:21 -0500414 mark_killed(&rw_map);
415 mark_killed(&readdir_map);
Mike Marshall274dcf52015-07-17 10:38:13 -0400416 gossip_debug(GOSSIP_BUFMAP_DEBUG,
Yi Liu8bb8aef2015-11-24 15:12:14 -0500417 "orangefs_bufmap_finalize: exiting normally\n");
Mike Marshall274dcf52015-07-17 10:38:13 -0400418}
419
Al Viroea2c9c92016-02-13 21:01:21 -0500420void orangefs_bufmap_run_down(void)
Mike Marshall274dcf52015-07-17 10:38:13 -0400421{
Al Viroea2c9c92016-02-13 21:01:21 -0500422 struct orangefs_bufmap *bufmap = __orangefs_bufmap;
423 if (!bufmap)
Mike Marshall274dcf52015-07-17 10:38:13 -0400424 return;
Al Viroea2c9c92016-02-13 21:01:21 -0500425 run_down(&rw_map);
426 run_down(&readdir_map);
427 spin_lock(&orangefs_bufmap_lock);
428 __orangefs_bufmap = NULL;
429 spin_unlock(&orangefs_bufmap_lock);
430 orangefs_bufmap_unmap(bufmap);
431 orangefs_bufmap_free(bufmap);
Mike Marshall274dcf52015-07-17 10:38:13 -0400432}
433
434/*
Yi Liu8bb8aef2015-11-24 15:12:14 -0500435 * orangefs_bufmap_get()
Mike Marshall274dcf52015-07-17 10:38:13 -0400436 *
437 * gets a free mapped buffer descriptor, will sleep until one becomes
438 * available if necessary
439 *
Al Virob8a99a82016-02-16 20:10:26 -0500440 * returns slot on success, -errno on failure
Mike Marshall274dcf52015-07-17 10:38:13 -0400441 */
Al Virob8a99a82016-02-16 20:10:26 -0500442int orangefs_bufmap_get(void)
Mike Marshall274dcf52015-07-17 10:38:13 -0400443{
Al Virob8a99a82016-02-16 20:10:26 -0500444 return get(&rw_map);
Mike Marshall274dcf52015-07-17 10:38:13 -0400445}
446
447/*
Yi Liu8bb8aef2015-11-24 15:12:14 -0500448 * orangefs_bufmap_put()
Mike Marshall274dcf52015-07-17 10:38:13 -0400449 *
450 * returns a mapped buffer descriptor to the collection
451 *
452 * no return value
453 */
Al Viro1357d062016-02-11 21:34:52 -0500454void orangefs_bufmap_put(int buffer_index)
Mike Marshall274dcf52015-07-17 10:38:13 -0400455{
Al Viroea2c9c92016-02-13 21:01:21 -0500456 put(&rw_map, buffer_index);
Mike Marshall274dcf52015-07-17 10:38:13 -0400457}
458
459/*
Martin Brandenburg7d221482016-01-04 15:05:28 -0500460 * orangefs_readdir_index_get()
Mike Marshall274dcf52015-07-17 10:38:13 -0400461 *
462 * gets a free descriptor, will sleep until one becomes
463 * available if necessary.
464 * Although the readdir buffers are not mapped into kernel space
465 * we could do that at a later point of time. Regardless, these
466 * indices are used by the client-core.
467 *
Al Virob8a99a82016-02-16 20:10:26 -0500468 * returns slot on success, -errno on failure
Mike Marshall274dcf52015-07-17 10:38:13 -0400469 */
Al Virob8a99a82016-02-16 20:10:26 -0500470int orangefs_readdir_index_get(void)
Mike Marshall274dcf52015-07-17 10:38:13 -0400471{
Al Virob8a99a82016-02-16 20:10:26 -0500472 return get(&readdir_map);
Mike Marshall274dcf52015-07-17 10:38:13 -0400473}
474
Al Viro82d37f12016-02-13 21:04:51 -0500475void orangefs_readdir_index_put(int buffer_index)
Mike Marshall274dcf52015-07-17 10:38:13 -0400476{
Al Viroea2c9c92016-02-13 21:01:21 -0500477 put(&readdir_map, buffer_index);
Mike Marshall274dcf52015-07-17 10:38:13 -0400478}
479
Mike Marshallb5e376e2015-12-11 10:50:42 -0500480/*
Mike Marshall95f5f882018-05-11 17:11:48 -0400481 * we've been handed an iovec, we need to copy it to
Mike Marshallb5e376e2015-12-11 10:50:42 -0500482 * the shared memory descriptor at "buffer_index".
483 */
Al Virobf6bf602016-02-16 20:06:19 -0500484int orangefs_bufmap_copy_from_iovec(struct iov_iter *iter,
Mike Marshall54804942015-10-05 13:44:24 -0400485 int buffer_index,
486 size_t size)
Mike Marshall274dcf52015-07-17 10:38:13 -0400487{
Al Virobf6bf602016-02-16 20:06:19 -0500488 struct orangefs_bufmap_desc *to;
Mike Marshall4d1c4402015-09-04 10:31:16 -0400489 int i;
Mike Marshall274dcf52015-07-17 10:38:13 -0400490
491 gossip_debug(GOSSIP_BUFMAP_DEBUG,
Al Viro34204fd2015-10-08 17:47:44 -0400492 "%s: buffer_index:%d: size:%zu:\n",
Mike Marshall4d1c4402015-09-04 10:31:16 -0400493 __func__, buffer_index, size);
Mike Marshall274dcf52015-07-17 10:38:13 -0400494
Al Virobf6bf602016-02-16 20:06:19 -0500495 to = &__orangefs_bufmap->desc_array[buffer_index];
Mike Marshall4d1c4402015-09-04 10:31:16 -0400496 for (i = 0; size; i++) {
Al Viro34204fd2015-10-08 17:47:44 -0400497 struct page *page = to->page_array[i];
498 size_t n = size;
499 if (n > PAGE_SIZE)
500 n = PAGE_SIZE;
Al Viro890559e2017-04-13 03:10:18 -0400501 if (copy_page_from_iter(page, 0, n, iter) != n)
Al Viro34204fd2015-10-08 17:47:44 -0400502 return -EFAULT;
503 size -= n;
Mike Marshall274dcf52015-07-17 10:38:13 -0400504 }
Al Viro34204fd2015-10-08 17:47:44 -0400505 return 0;
Mike Marshall274dcf52015-07-17 10:38:13 -0400506}
507
508/*
Mike Marshallb5e376e2015-12-11 10:50:42 -0500509 * we've been handed an iovec, we need to fill it from
510 * the shared memory descriptor at "buffer_index".
Mike Marshall274dcf52015-07-17 10:38:13 -0400511 */
Al Virobf6bf602016-02-16 20:06:19 -0500512int orangefs_bufmap_copy_to_iovec(struct iov_iter *iter,
Al Viro5c278222015-10-08 17:43:58 -0400513 int buffer_index,
514 size_t size)
Mike Marshall274dcf52015-07-17 10:38:13 -0400515{
Al Virobf6bf602016-02-16 20:06:19 -0500516 struct orangefs_bufmap_desc *from;
Mike Marshall4d1c4402015-09-04 10:31:16 -0400517 int i;
Mike Marshall274dcf52015-07-17 10:38:13 -0400518
Al Virobf6bf602016-02-16 20:06:19 -0500519 from = &__orangefs_bufmap->desc_array[buffer_index];
Mike Marshall274dcf52015-07-17 10:38:13 -0400520 gossip_debug(GOSSIP_BUFMAP_DEBUG,
Al Viro5c278222015-10-08 17:43:58 -0400521 "%s: buffer_index:%d: size:%zu:\n",
522 __func__, buffer_index, size);
Mike Marshall274dcf52015-07-17 10:38:13 -0400523
Mike Marshall274dcf52015-07-17 10:38:13 -0400524
Al Viro5c278222015-10-08 17:43:58 -0400525 for (i = 0; size; i++) {
526 struct page *page = from->page_array[i];
527 size_t n = size;
528 if (n > PAGE_SIZE)
529 n = PAGE_SIZE;
530 n = copy_page_to_iter(page, 0, n, iter);
531 if (!n)
532 return -EFAULT;
533 size -= n;
Mike Marshall274dcf52015-07-17 10:38:13 -0400534 }
Al Viro5c278222015-10-08 17:43:58 -0400535 return 0;
Mike Marshall274dcf52015-07-17 10:38:13 -0400536}
Mike Marshalldd59a642019-03-25 18:59:29 -0400537
538void orangefs_bufmap_page_fill(void *page_to,
539 int buffer_index,
540 int slot_index)
541{
542 struct orangefs_bufmap_desc *from;
543 void *page_from;
544
545 from = &__orangefs_bufmap->desc_array[buffer_index];
546 page_from = kmap_atomic(from->page_array[slot_index]);
547 memcpy(page_to, page_from, PAGE_SIZE);
548 kunmap_atomic(page_from);
549}