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The discovered bit in PGCCSR register indicates if the device has been
[linux-2.6/next.git] / fs / nfs / nfs4filelayout.c
blob6976a72576f51c19e30927d3ac1ba4166f5c0d9a
1 /*
2 * Module for the pnfs nfs4 file layout driver.
3 * Defines all I/O and Policy interface operations, plus code
4 * to register itself with the pNFS client.
5 *
6 * Copyright (c) 2002
7 * The Regents of the University of Michigan
8 * All Rights Reserved
9 *
10 * Dean Hildebrand <dhildebz@umich.edu>
11 *
12 * Permission is granted to use, copy, create derivative works, and
13 * redistribute this software and such derivative works for any purpose,
14 * so long as the name of the University of Michigan is not used in
15 * any advertising or publicity pertaining to the use or distribution
16 * of this software without specific, written prior authorization. If
17 * the above copyright notice or any other identification of the
18 * University of Michigan is included in any copy of any portion of
19 * this software, then the disclaimer below must also be included.
20 *
21 * This software is provided as is, without representation or warranty
22 * of any kind either express or implied, including without limitation
23 * the implied warranties of merchantability, fitness for a particular
24 * purpose, or noninfringement. The Regents of the University of
25 * Michigan shall not be liable for any damages, including special,
26 * indirect, incidental, or consequential damages, with respect to any
27 * claim arising out of or in connection with the use of the software,
28 * even if it has been or is hereafter advised of the possibility of
29 * such damages.
30 */
31
32 #include <linux/nfs_fs.h>
33 #include <linux/nfs_page.h>
34
35 #include "internal.h"
36 #include "nfs4filelayout.h"
37
38 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
39
40 MODULE_LICENSE("GPL");
41 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
42 MODULE_DESCRIPTION("The NFSv4 file layout driver");
43
44 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
45
46 static loff_t
47 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
48 loff_t offset)
49 {
50 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
51 u64 tmp, uoff;
52
53 offset -= flseg->pattern_offset;
54 tmp = uoff = offset;
55 do_div(tmp, stripe_width);
56
57 return tmp * flseg->stripe_unit + do_div(uoff, flseg->stripe_unit);
58 }
59
60 /* This function is used by the layout driver to calculate the
61 * offset of the file on the dserver based on whether the
62 * layout type is STRIPE_DENSE or STRIPE_SPARSE
63 */
64 static loff_t
65 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
66 {
67 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
68
69 switch (flseg->stripe_type) {
70 case STRIPE_SPARSE:
71 return offset;
72
73 case STRIPE_DENSE:
74 return filelayout_get_dense_offset(flseg, offset);
75 }
76
77 BUG();
78 }
79
80 /* For data server errors we don't recover from */
81 static void
82 filelayout_set_lo_fail(struct pnfs_layout_segment *lseg)
83 {
84 if (lseg->pls_range.iomode == IOMODE_RW) {
85 dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__);
86 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
87 } else {
88 dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__);
89 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
90 }
91 }
92
93 static int filelayout_async_handle_error(struct rpc_task *task,
94 struct nfs4_state *state,
95 struct nfs_client *clp,
96 int *reset)
97 {
98 if (task->tk_status >= 0)
99 return 0;
100
101 *reset = 0;
102
103 switch (task->tk_status) {
104 case -NFS4ERR_BADSESSION:
105 case -NFS4ERR_BADSLOT:
106 case -NFS4ERR_BAD_HIGH_SLOT:
107 case -NFS4ERR_DEADSESSION:
108 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
109 case -NFS4ERR_SEQ_FALSE_RETRY:
110 case -NFS4ERR_SEQ_MISORDERED:
111 dprintk("%s ERROR %d, Reset session. Exchangeid "
112 "flags 0x%x\n", __func__, task->tk_status,
113 clp->cl_exchange_flags);
114 nfs4_schedule_session_recovery(clp->cl_session);
115 break;
116 case -NFS4ERR_DELAY:
117 case -NFS4ERR_GRACE:
118 case -EKEYEXPIRED:
119 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
120 break;
121 case -NFS4ERR_RETRY_UNCACHED_REP:
122 break;
123 default:
124 dprintk("%s DS error. Retry through MDS %d\n", __func__,
125 task->tk_status);
126 *reset = 1;
127 break;
128 }
129 task->tk_status = 0;
130 return -EAGAIN;
131 }
132
133 /* NFS_PROTO call done callback routines */
134
135 static int filelayout_read_done_cb(struct rpc_task *task,
136 struct nfs_read_data *data)
137 {
138 struct nfs_client *clp = data->ds_clp;
139 int reset = 0;
140
141 dprintk("%s DS read\n", __func__);
142
143 if (filelayout_async_handle_error(task, data->args.context->state,
144 data->ds_clp, &reset) == -EAGAIN) {
145 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
146 __func__, data->ds_clp, data->ds_clp->cl_session);
147 if (reset) {
148 filelayout_set_lo_fail(data->lseg);
149 nfs4_reset_read(task, data);
150 clp = NFS_SERVER(data->inode)->nfs_client;
151 }
152 nfs_restart_rpc(task, clp);
153 return -EAGAIN;
154 }
155
156 return 0;
157 }
158
159 /*
160 * We reference the rpc_cred of the first WRITE that triggers the need for
161 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
162 * rfc5661 is not clear about which credential should be used.
163 */
164 static void
165 filelayout_set_layoutcommit(struct nfs_write_data *wdata)
166 {
167 if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds ||
168 wdata->res.verf->committed == NFS_FILE_SYNC)
169 return;
170
171 pnfs_set_layoutcommit(wdata);
172 dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino,
173 (unsigned long) NFS_I(wdata->inode)->layout->plh_lwb);
174 }
175
176 /*
177 * Call ops for the async read/write cases
178 * In the case of dense layouts, the offset needs to be reset to its
179 * original value.
180 */
181 static void filelayout_read_prepare(struct rpc_task *task, void *data)
182 {
183 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
184
185 rdata->read_done_cb = filelayout_read_done_cb;
186
187 if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
188 &rdata->args.seq_args, &rdata->res.seq_res,
189 0, task))
190 return;
191
192 rpc_call_start(task);
193 }
194
195 static void filelayout_read_call_done(struct rpc_task *task, void *data)
196 {
197 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
198
199 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
200
201 /* Note this may cause RPC to be resent */
202 rdata->mds_ops->rpc_call_done(task, data);
203 }
204
205 static void filelayout_read_release(void *data)
206 {
207 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
208
209 rdata->mds_ops->rpc_release(data);
210 }
211
212 static int filelayout_write_done_cb(struct rpc_task *task,
213 struct nfs_write_data *data)
214 {
215 int reset = 0;
216
217 if (filelayout_async_handle_error(task, data->args.context->state,
218 data->ds_clp, &reset) == -EAGAIN) {
219 struct nfs_client *clp;
220
221 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
222 __func__, data->ds_clp, data->ds_clp->cl_session);
223 if (reset) {
224 filelayout_set_lo_fail(data->lseg);
225 nfs4_reset_write(task, data);
226 clp = NFS_SERVER(data->inode)->nfs_client;
227 } else
228 clp = data->ds_clp;
229 nfs_restart_rpc(task, clp);
230 return -EAGAIN;
231 }
232
233 filelayout_set_layoutcommit(data);
234 return 0;
235 }
236
237 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
238 static void prepare_to_resend_writes(struct nfs_write_data *data)
239 {
240 struct nfs_page *first = nfs_list_entry(data->pages.next);
241
242 data->task.tk_status = 0;
243 memcpy(data->verf.verifier, first->wb_verf.verifier,
244 sizeof(first->wb_verf.verifier));
245 data->verf.verifier[0]++; /* ensure verifier mismatch */
246 }
247
248 static int filelayout_commit_done_cb(struct rpc_task *task,
249 struct nfs_write_data *data)
250 {
251 int reset = 0;
252
253 if (filelayout_async_handle_error(task, data->args.context->state,
254 data->ds_clp, &reset) == -EAGAIN) {
255 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
256 __func__, data->ds_clp, data->ds_clp->cl_session);
257 if (reset) {
258 prepare_to_resend_writes(data);
259 filelayout_set_lo_fail(data->lseg);
260 } else
261 nfs_restart_rpc(task, data->ds_clp);
262 return -EAGAIN;
263 }
264
265 return 0;
266 }
267
268 static void filelayout_write_prepare(struct rpc_task *task, void *data)
269 {
270 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
271
272 if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
273 &wdata->args.seq_args, &wdata->res.seq_res,
274 0, task))
275 return;
276
277 rpc_call_start(task);
278 }
279
280 static void filelayout_write_call_done(struct rpc_task *task, void *data)
281 {
282 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
283
284 /* Note this may cause RPC to be resent */
285 wdata->mds_ops->rpc_call_done(task, data);
286 }
287
288 static void filelayout_write_release(void *data)
289 {
290 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
291
292 wdata->mds_ops->rpc_release(data);
293 }
294
295 static void filelayout_commit_release(void *data)
296 {
297 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
298
299 nfs_commit_release_pages(wdata);
300 if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding))
301 nfs_commit_clear_lock(NFS_I(wdata->inode));
302 nfs_commitdata_release(wdata);
303 }
304
305 struct rpc_call_ops filelayout_read_call_ops = {
306 .rpc_call_prepare = filelayout_read_prepare,
307 .rpc_call_done = filelayout_read_call_done,
308 .rpc_release = filelayout_read_release,
309 };
310
311 struct rpc_call_ops filelayout_write_call_ops = {
312 .rpc_call_prepare = filelayout_write_prepare,
313 .rpc_call_done = filelayout_write_call_done,
314 .rpc_release = filelayout_write_release,
315 };
316
317 struct rpc_call_ops filelayout_commit_call_ops = {
318 .rpc_call_prepare = filelayout_write_prepare,
319 .rpc_call_done = filelayout_write_call_done,
320 .rpc_release = filelayout_commit_release,
321 };
322
323 static enum pnfs_try_status
324 filelayout_read_pagelist(struct nfs_read_data *data)
325 {
326 struct pnfs_layout_segment *lseg = data->lseg;
327 struct nfs4_pnfs_ds *ds;
328 loff_t offset = data->args.offset;
329 u32 j, idx;
330 struct nfs_fh *fh;
331 int status;
332
333 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
334 __func__, data->inode->i_ino,
335 data->args.pgbase, (size_t)data->args.count, offset);
336
337 if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
338 return PNFS_NOT_ATTEMPTED;
339
340 /* Retrieve the correct rpc_client for the byte range */
341 j = nfs4_fl_calc_j_index(lseg, offset);
342 idx = nfs4_fl_calc_ds_index(lseg, j);
343 ds = nfs4_fl_prepare_ds(lseg, idx);
344 if (!ds) {
345 /* Either layout fh index faulty, or ds connect failed */
346 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
347 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
348 return PNFS_NOT_ATTEMPTED;
349 }
350 dprintk("%s USE DS: %s\n", __func__, ds->ds_remotestr);
351
352 /* No multipath support. Use first DS */
353 data->ds_clp = ds->ds_clp;
354 fh = nfs4_fl_select_ds_fh(lseg, j);
355 if (fh)
356 data->args.fh = fh;
357
358 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
359 data->mds_offset = offset;
360
361 /* Perform an asynchronous read to ds */
362 status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
363 &filelayout_read_call_ops);
364 BUG_ON(status != 0);
365 return PNFS_ATTEMPTED;
366 }
367
368 /* Perform async writes. */
369 static enum pnfs_try_status
370 filelayout_write_pagelist(struct nfs_write_data *data, int sync)
371 {
372 struct pnfs_layout_segment *lseg = data->lseg;
373 struct nfs4_pnfs_ds *ds;
374 loff_t offset = data->args.offset;
375 u32 j, idx;
376 struct nfs_fh *fh;
377 int status;
378
379 if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
380 return PNFS_NOT_ATTEMPTED;
381
382 /* Retrieve the correct rpc_client for the byte range */
383 j = nfs4_fl_calc_j_index(lseg, offset);
384 idx = nfs4_fl_calc_ds_index(lseg, j);
385 ds = nfs4_fl_prepare_ds(lseg, idx);
386 if (!ds) {
387 printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
388 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
389 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
390 return PNFS_NOT_ATTEMPTED;
391 }
392 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__,
393 data->inode->i_ino, sync, (size_t) data->args.count, offset,
394 ds->ds_remotestr);
395
396 data->write_done_cb = filelayout_write_done_cb;
397 data->ds_clp = ds->ds_clp;
398 fh = nfs4_fl_select_ds_fh(lseg, j);
399 if (fh)
400 data->args.fh = fh;
401 /*
402 * Get the file offset on the dserver. Set the write offset to
403 * this offset and save the original offset.
404 */
405 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
406
407 /* Perform an asynchronous write */
408 status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
409 &filelayout_write_call_ops, sync);
410 BUG_ON(status != 0);
411 return PNFS_ATTEMPTED;
412 }
413
414 /*
415 * filelayout_check_layout()
416 *
417 * Make sure layout segment parameters are sane WRT the device.
418 * At this point no generic layer initialization of the lseg has occurred,
419 * and nothing has been added to the layout_hdr cache.
420 *
421 */
422 static int
423 filelayout_check_layout(struct pnfs_layout_hdr *lo,
424 struct nfs4_filelayout_segment *fl,
425 struct nfs4_layoutget_res *lgr,
426 struct nfs4_deviceid *id,
427 gfp_t gfp_flags)
428 {
429 struct nfs4_deviceid_node *d;
430 struct nfs4_file_layout_dsaddr *dsaddr;
431 int status = -EINVAL;
432 struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
433
434 dprintk("--> %s\n", __func__);
435
436 /* FIXME: remove this check when layout segment support is added */
437 if (lgr->range.offset != 0 ||
438 lgr->range.length != NFS4_MAX_UINT64) {
439 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
440 __func__);
441 goto out;
442 }
443
444 if (fl->pattern_offset > lgr->range.offset) {
445 dprintk("%s pattern_offset %lld too large\n",
446 __func__, fl->pattern_offset);
447 goto out;
448 }
449
450 if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
451 dprintk("%s Invalid stripe unit (%u)\n",
452 __func__, fl->stripe_unit);
453 goto out;
454 }
455
456 /* find and reference the deviceid */
457 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
458 NFS_SERVER(lo->plh_inode)->nfs_client, id);
459 if (d == NULL) {
460 dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
461 if (dsaddr == NULL)
462 goto out;
463 } else
464 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
465 /* Found deviceid is being reaped */
466 if (test_bit(NFS_DEVICEID_INVALID, &dsaddr->id_node.flags))
467 goto out_put;
468
469 fl->dsaddr = dsaddr;
470
471 if (fl->first_stripe_index < 0 ||
472 fl->first_stripe_index >= dsaddr->stripe_count) {
473 dprintk("%s Bad first_stripe_index %d\n",
474 __func__, fl->first_stripe_index);
475 goto out_put;
476 }
477
478 if ((fl->stripe_type == STRIPE_SPARSE &&
479 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
480 (fl->stripe_type == STRIPE_DENSE &&
481 fl->num_fh != dsaddr->stripe_count)) {
482 dprintk("%s num_fh %u not valid for given packing\n",
483 __func__, fl->num_fh);
484 goto out_put;
485 }
486
487 if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
488 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
489 "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
490 nfss->wsize);
491 }
492
493 status = 0;
494 out:
495 dprintk("--> %s returns %d\n", __func__, status);
496 return status;
497 out_put:
498 nfs4_fl_put_deviceid(dsaddr);
499 goto out;
500 }
501
502 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
503 {
504 int i;
505
506 for (i = 0; i < fl->num_fh; i++) {
507 if (!fl->fh_array[i])
508 break;
509 kfree(fl->fh_array[i]);
510 }
511 kfree(fl->fh_array);
512 fl->fh_array = NULL;
513 }
514
515 static void
516 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
517 {
518 filelayout_free_fh_array(fl);
519 kfree(fl);
520 }
521
522 static int
523 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
524 struct nfs4_filelayout_segment *fl,
525 struct nfs4_layoutget_res *lgr,
526 struct nfs4_deviceid *id,
527 gfp_t gfp_flags)
528 {
529 struct xdr_stream stream;
530 struct xdr_buf buf;
531 struct page *scratch;
532 __be32 *p;
533 uint32_t nfl_util;
534 int i;
535
536 dprintk("%s: set_layout_map Begin\n", __func__);
537
538 scratch = alloc_page(gfp_flags);
539 if (!scratch)
540 return -ENOMEM;
541
542 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
543 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
544
545 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
546 * num_fh (4) */
547 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
548 if (unlikely(!p))
549 goto out_err;
550
551 memcpy(id, p, sizeof(*id));
552 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
553 nfs4_print_deviceid(id);
554
555 nfl_util = be32_to_cpup(p++);
556 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
557 fl->commit_through_mds = 1;
558 if (nfl_util & NFL4_UFLG_DENSE)
559 fl->stripe_type = STRIPE_DENSE;
560 else
561 fl->stripe_type = STRIPE_SPARSE;
562 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
563
564 fl->first_stripe_index = be32_to_cpup(p++);
565 p = xdr_decode_hyper(p, &fl->pattern_offset);
566 fl->num_fh = be32_to_cpup(p++);
567
568 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
569 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
570 fl->pattern_offset);
571
572 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
573 * Futher checking is done in filelayout_check_layout */
574 if (fl->num_fh < 0 || fl->num_fh >
575 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
576 goto out_err;
577
578 if (fl->num_fh > 0) {
579 fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
580 gfp_flags);
581 if (!fl->fh_array)
582 goto out_err;
583 }
584
585 for (i = 0; i < fl->num_fh; i++) {
586 /* Do we want to use a mempool here? */
587 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
588 if (!fl->fh_array[i])
589 goto out_err_free;
590
591 p = xdr_inline_decode(&stream, 4);
592 if (unlikely(!p))
593 goto out_err_free;
594 fl->fh_array[i]->size = be32_to_cpup(p++);
595 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
596 printk(KERN_ERR "Too big fh %d received %d\n",
597 i, fl->fh_array[i]->size);
598 goto out_err_free;
599 }
600
601 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
602 if (unlikely(!p))
603 goto out_err_free;
604 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
605 dprintk("DEBUG: %s: fh len %d\n", __func__,
606 fl->fh_array[i]->size);
607 }
608
609 __free_page(scratch);
610 return 0;
611
612 out_err_free:
613 filelayout_free_fh_array(fl);
614 out_err:
615 __free_page(scratch);
616 return -EIO;
617 }
618
619 static void
620 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
621 {
622 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
623
624 dprintk("--> %s\n", __func__);
625 nfs4_fl_put_deviceid(fl->dsaddr);
626 kfree(fl->commit_buckets);
627 _filelayout_free_lseg(fl);
628 }
629
630 static struct pnfs_layout_segment *
631 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
632 struct nfs4_layoutget_res *lgr,
633 gfp_t gfp_flags)
634 {
635 struct nfs4_filelayout_segment *fl;
636 int rc;
637 struct nfs4_deviceid id;
638
639 dprintk("--> %s\n", __func__);
640 fl = kzalloc(sizeof(*fl), gfp_flags);
641 if (!fl)
642 return NULL;
643
644 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
645 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
646 _filelayout_free_lseg(fl);
647 return NULL;
648 }
649
650 /* This assumes there is only one IOMODE_RW lseg. What
651 * we really want to do is have a layout_hdr level
652 * dictionary of <multipath_list4, fh> keys, each
653 * associated with a struct list_head, populated by calls
654 * to filelayout_write_pagelist().
655 * */
656 if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) {
657 int i;
658 int size = (fl->stripe_type == STRIPE_SPARSE) ?
659 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
660
661 fl->commit_buckets = kcalloc(size, sizeof(struct list_head), gfp_flags);
662 if (!fl->commit_buckets) {
663 filelayout_free_lseg(&fl->generic_hdr);
664 return NULL;
665 }
666 fl->number_of_buckets = size;
667 for (i = 0; i < size; i++)
668 INIT_LIST_HEAD(&fl->commit_buckets[i]);
669 }
670 return &fl->generic_hdr;
671 }
672
673 /*
674 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
675 *
676 * return true : coalesce page
677 * return false : don't coalesce page
678 */
679 static bool
680 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
681 struct nfs_page *req)
682 {
683 u64 p_stripe, r_stripe;
684 u32 stripe_unit;
685
686 if (!pnfs_generic_pg_test(pgio, prev, req) ||
687 !nfs_generic_pg_test(pgio, prev, req))
688 return false;
689
690 p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
691 r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
692 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
693
694 do_div(p_stripe, stripe_unit);
695 do_div(r_stripe, stripe_unit);
696
697 return (p_stripe == r_stripe);
698 }
699
700 void
701 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
702 struct nfs_page *req)
703 {
704 BUG_ON(pgio->pg_lseg != NULL);
705
706 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
707 req->wb_context,
708 0,
709 NFS4_MAX_UINT64,
710 IOMODE_READ,
711 GFP_KERNEL);
712 /* If no lseg, fall back to read through mds */
713 if (pgio->pg_lseg == NULL)
714 nfs_pageio_reset_read_mds(pgio);
715 }
716
717 void
718 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
719 struct nfs_page *req)
720 {
721 BUG_ON(pgio->pg_lseg != NULL);
722
723 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
724 req->wb_context,
725 0,
726 NFS4_MAX_UINT64,
727 IOMODE_RW,
728 GFP_NOFS);
729 /* If no lseg, fall back to write through mds */
730 if (pgio->pg_lseg == NULL)
731 nfs_pageio_reset_write_mds(pgio);
732 }
733
734 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
735 .pg_init = filelayout_pg_init_read,
736 .pg_test = filelayout_pg_test,
737 .pg_doio = pnfs_generic_pg_readpages,
738 };
739
740 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
741 .pg_init = filelayout_pg_init_write,
742 .pg_test = filelayout_pg_test,
743 .pg_doio = pnfs_generic_pg_writepages,
744 };
745
746 static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
747 {
748 return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
749 }
750
751 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
752 {
753 if (fl->stripe_type == STRIPE_SPARSE)
754 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
755 else
756 return j;
757 }
758
759 struct list_head *filelayout_choose_commit_list(struct nfs_page *req)
760 {
761 struct pnfs_layout_segment *lseg = req->wb_commit_lseg;
762 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
763 u32 i, j;
764 struct list_head *list;
765
766 /* Note that we are calling nfs4_fl_calc_j_index on each page
767 * that ends up being committed to a data server. An attractive
768 * alternative is to add a field to nfs_write_data and nfs_page
769 * to store the value calculated in filelayout_write_pagelist
770 * and just use that here.
771 */
772 j = nfs4_fl_calc_j_index(lseg,
773 (loff_t)req->wb_index << PAGE_CACHE_SHIFT);
774 i = select_bucket_index(fl, j);
775 list = &fl->commit_buckets[i];
776 if (list_empty(list)) {
777 /* Non-empty buckets hold a reference on the lseg */
778 get_lseg(lseg);
779 }
780 return list;
781 }
782
783 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
784 {
785 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
786
787 if (flseg->stripe_type == STRIPE_SPARSE)
788 return i;
789 else
790 return nfs4_fl_calc_ds_index(lseg, i);
791 }
792
793 static struct nfs_fh *
794 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
795 {
796 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
797
798 if (flseg->stripe_type == STRIPE_SPARSE) {
799 if (flseg->num_fh == 1)
800 i = 0;
801 else if (flseg->num_fh == 0)
802 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
803 return NULL;
804 }
805 return flseg->fh_array[i];
806 }
807
808 static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
809 {
810 struct pnfs_layout_segment *lseg = data->lseg;
811 struct nfs4_pnfs_ds *ds;
812 u32 idx;
813 struct nfs_fh *fh;
814
815 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
816 ds = nfs4_fl_prepare_ds(lseg, idx);
817 if (!ds) {
818 printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
819 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
820 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
821 prepare_to_resend_writes(data);
822 data->mds_ops->rpc_release(data);
823 return -EAGAIN;
824 }
825 dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
826 data->write_done_cb = filelayout_commit_done_cb;
827 data->ds_clp = ds->ds_clp;
828 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
829 if (fh)
830 data->args.fh = fh;
831 return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
832 &filelayout_commit_call_ops, how);
833 }
834
835 /*
836 * This is only useful while we are using whole file layouts.
837 */
838 static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
839 {
840 struct pnfs_layout_segment *lseg, *rv = NULL;
841
842 spin_lock(&inode->i_lock);
843 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
844 if (lseg->pls_range.iomode == IOMODE_RW)
845 rv = get_lseg(lseg);
846 spin_unlock(&inode->i_lock);
847 return rv;
848 }
849
850 static int alloc_ds_commits(struct inode *inode, struct list_head *list)
851 {
852 struct pnfs_layout_segment *lseg;
853 struct nfs4_filelayout_segment *fl;
854 struct nfs_write_data *data;
855 int i, j;
856
857 /* Won't need this when non-whole file layout segments are supported
858 * instead we will use a pnfs_layout_hdr structure */
859 lseg = find_only_write_lseg(inode);
860 if (!lseg)
861 return 0;
862 fl = FILELAYOUT_LSEG(lseg);
863 for (i = 0; i < fl->number_of_buckets; i++) {
864 if (list_empty(&fl->commit_buckets[i]))
865 continue;
866 data = nfs_commitdata_alloc();
867 if (!data)
868 goto out_bad;
869 data->ds_commit_index = i;
870 data->lseg = lseg;
871 list_add(&data->pages, list);
872 }
873 put_lseg(lseg);
874 return 0;
875
876 out_bad:
877 for (j = i; j < fl->number_of_buckets; j++) {
878 if (list_empty(&fl->commit_buckets[i]))
879 continue;
880 nfs_retry_commit(&fl->commit_buckets[i], lseg);
881 put_lseg(lseg); /* associated with emptying bucket */
882 }
883 put_lseg(lseg);
884 /* Caller will clean up entries put on list */
885 return -ENOMEM;
886 }
887
888 /* This follows nfs_commit_list pretty closely */
889 static int
890 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
891 int how)
892 {
893 struct nfs_write_data *data, *tmp;
894 LIST_HEAD(list);
895
896 if (!list_empty(mds_pages)) {
897 data = nfs_commitdata_alloc();
898 if (!data)
899 goto out_bad;
900 data->lseg = NULL;
901 list_add(&data->pages, &list);
902 }
903
904 if (alloc_ds_commits(inode, &list))
905 goto out_bad;
906
907 list_for_each_entry_safe(data, tmp, &list, pages) {
908 list_del_init(&data->pages);
909 atomic_inc(&NFS_I(inode)->commits_outstanding);
910 if (!data->lseg) {
911 nfs_init_commit(data, mds_pages, NULL);
912 nfs_initiate_commit(data, NFS_CLIENT(inode),
913 data->mds_ops, how);
914 } else {
915 nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg);
916 filelayout_initiate_commit(data, how);
917 }
918 }
919 return 0;
920 out_bad:
921 list_for_each_entry_safe(data, tmp, &list, pages) {
922 nfs_retry_commit(&data->pages, data->lseg);
923 list_del_init(&data->pages);
924 nfs_commit_free(data);
925 }
926 nfs_retry_commit(mds_pages, NULL);
927 nfs_commit_clear_lock(NFS_I(inode));
928 return -ENOMEM;
929 }
930
931 static void
932 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
933 {
934 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
935 }
936
937 static struct pnfs_layoutdriver_type filelayout_type = {
938 .id = LAYOUT_NFSV4_1_FILES,
939 .name = "LAYOUT_NFSV4_1_FILES",
940 .owner = THIS_MODULE,
941 .alloc_lseg = filelayout_alloc_lseg,
942 .free_lseg = filelayout_free_lseg,
943 .pg_read_ops = &filelayout_pg_read_ops,
944 .pg_write_ops = &filelayout_pg_write_ops,
945 .mark_pnfs_commit = filelayout_mark_pnfs_commit,
946 .choose_commit_list = filelayout_choose_commit_list,
947 .commit_pagelist = filelayout_commit_pagelist,
948 .read_pagelist = filelayout_read_pagelist,
949 .write_pagelist = filelayout_write_pagelist,
950 .free_deviceid_node = filelayout_free_deveiceid_node,
951 };
952
953 static int __init nfs4filelayout_init(void)
954 {
955 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
956 __func__);
957 return pnfs_register_layoutdriver(&filelayout_type);
958 }
959
960 static void __exit nfs4filelayout_exit(void)
961 {
962 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
963 __func__);
964 pnfs_unregister_layoutdriver(&filelayout_type);
965 }
966
967 MODULE_ALIAS("nfs-layouttype4-1");
968
969 module_init(nfs4filelayout_init);
970 module_exit(nfs4filelayout_exit);
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