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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#include <linux/module.h>
35
36#include <linux/sunrpc/metrics.h>
37
38#include "nfs4session.h"
39#include "internal.h"
40#include "delegation.h"
41#include "nfs4filelayout.h"
42#include "nfs4trace.h"
43
44#define NFSDBG_FACILITY NFSDBG_PNFS_LD
45
46MODULE_LICENSE("GPL");
47MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
48MODULE_DESCRIPTION("The NFSv4 file layout driver");
49
50#define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
51
52static loff_t
53filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
54 loff_t offset)
55{
56 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
57 u64 stripe_no;
58 u32 rem;
59
60 offset -= flseg->pattern_offset;
61 stripe_no = div_u64(offset, stripe_width);
62 div_u64_rem(offset, flseg->stripe_unit, &rem);
63
64 return stripe_no * flseg->stripe_unit + rem;
65}
66
67/* This function is used by the layout driver to calculate the
68 * offset of the file on the dserver based on whether the
69 * layout type is STRIPE_DENSE or STRIPE_SPARSE
70 */
71static loff_t
72filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
73{
74 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
75
76 switch (flseg->stripe_type) {
77 case STRIPE_SPARSE:
78 return offset;
79
80 case STRIPE_DENSE:
81 return filelayout_get_dense_offset(flseg, offset);
82 }
83
84 BUG();
85}
86
87static void filelayout_reset_write(struct nfs_write_data *data)
88{
89 struct nfs_pgio_header *hdr = data->header;
90 struct rpc_task *task = &data->task;
91
92 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
93 dprintk("%s Reset task %5u for i/o through MDS "
94 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
95 data->task.tk_pid,
96 hdr->inode->i_sb->s_id,
97 (unsigned long long)NFS_FILEID(hdr->inode),
98 data->args.count,
99 (unsigned long long)data->args.offset);
100
101 task->tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
102 &hdr->pages,
103 hdr->completion_ops,
104 hdr->dreq);
105 }
106}
107
108static void filelayout_reset_read(struct nfs_read_data *data)
109{
110 struct nfs_pgio_header *hdr = data->header;
111 struct rpc_task *task = &data->task;
112
113 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
114 dprintk("%s Reset task %5u for i/o through MDS "
115 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
116 data->task.tk_pid,
117 hdr->inode->i_sb->s_id,
118 (unsigned long long)NFS_FILEID(hdr->inode),
119 data->args.count,
120 (unsigned long long)data->args.offset);
121
122 task->tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
123 &hdr->pages,
124 hdr->completion_ops,
125 hdr->dreq);
126 }
127}
128
129static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo)
130{
131 if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
132 return;
133 pnfs_return_layout(inode);
134}
135
136static int filelayout_async_handle_error(struct rpc_task *task,
137 struct nfs4_state *state,
138 struct nfs_client *clp,
139 struct pnfs_layout_segment *lseg)
140{
141 struct pnfs_layout_hdr *lo = lseg->pls_layout;
142 struct inode *inode = lo->plh_inode;
143 struct nfs_server *mds_server = NFS_SERVER(inode);
144 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
145 struct nfs_client *mds_client = mds_server->nfs_client;
146 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
147
148 if (task->tk_status >= 0)
149 return 0;
150
151 switch (task->tk_status) {
152 /* MDS state errors */
153 case -NFS4ERR_DELEG_REVOKED:
154 case -NFS4ERR_ADMIN_REVOKED:
155 case -NFS4ERR_BAD_STATEID:
156 if (state == NULL)
157 break;
158 nfs_remove_bad_delegation(state->inode);
159 case -NFS4ERR_OPENMODE:
160 if (state == NULL)
161 break;
162 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
163 goto out_bad_stateid;
164 goto wait_on_recovery;
165 case -NFS4ERR_EXPIRED:
166 if (state != NULL) {
167 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
168 goto out_bad_stateid;
169 }
170 nfs4_schedule_lease_recovery(mds_client);
171 goto wait_on_recovery;
172 /* DS session errors */
173 case -NFS4ERR_BADSESSION:
174 case -NFS4ERR_BADSLOT:
175 case -NFS4ERR_BAD_HIGH_SLOT:
176 case -NFS4ERR_DEADSESSION:
177 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
178 case -NFS4ERR_SEQ_FALSE_RETRY:
179 case -NFS4ERR_SEQ_MISORDERED:
180 dprintk("%s ERROR %d, Reset session. Exchangeid "
181 "flags 0x%x\n", __func__, task->tk_status,
182 clp->cl_exchange_flags);
183 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
184 break;
185 case -NFS4ERR_DELAY:
186 case -NFS4ERR_GRACE:
187 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
188 break;
189 case -NFS4ERR_RETRY_UNCACHED_REP:
190 break;
191 /* Invalidate Layout errors */
192 case -NFS4ERR_PNFS_NO_LAYOUT:
193 case -ESTALE: /* mapped NFS4ERR_STALE */
194 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
195 case -EISDIR: /* mapped NFS4ERR_ISDIR */
196 case -NFS4ERR_FHEXPIRED:
197 case -NFS4ERR_WRONG_TYPE:
198 dprintk("%s Invalid layout error %d\n", __func__,
199 task->tk_status);
200 /*
201 * Destroy layout so new i/o will get a new layout.
202 * Layout will not be destroyed until all current lseg
203 * references are put. Mark layout as invalid to resend failed
204 * i/o and all i/o waiting on the slot table to the MDS until
205 * layout is destroyed and a new valid layout is obtained.
206 */
207 pnfs_destroy_layout(NFS_I(inode));
208 rpc_wake_up(&tbl->slot_tbl_waitq);
209 goto reset;
210 /* RPC connection errors */
211 case -ECONNREFUSED:
212 case -EHOSTDOWN:
213 case -EHOSTUNREACH:
214 case -ENETUNREACH:
215 case -EIO:
216 case -ETIMEDOUT:
217 case -EPIPE:
218 dprintk("%s DS connection error %d\n", __func__,
219 task->tk_status);
220 nfs4_mark_deviceid_unavailable(devid);
221 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
222 rpc_wake_up(&tbl->slot_tbl_waitq);
223 /* fall through */
224 default:
225reset:
226 dprintk("%s Retry through MDS. Error %d\n", __func__,
227 task->tk_status);
228 return -NFS4ERR_RESET_TO_MDS;
229 }
230out:
231 task->tk_status = 0;
232 return -EAGAIN;
233out_bad_stateid:
234 task->tk_status = -EIO;
235 return 0;
236wait_on_recovery:
237 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
238 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
239 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
240 goto out;
241}
242
243/* NFS_PROTO call done callback routines */
244
245static int filelayout_read_done_cb(struct rpc_task *task,
246 struct nfs_read_data *data)
247{
248 struct nfs_pgio_header *hdr = data->header;
249 int err;
250
251 trace_nfs4_pnfs_read(data, task->tk_status);
252 err = filelayout_async_handle_error(task, data->args.context->state,
253 data->ds_clp, hdr->lseg);
254
255 switch (err) {
256 case -NFS4ERR_RESET_TO_MDS:
257 filelayout_reset_read(data);
258 return task->tk_status;
259 case -EAGAIN:
260 rpc_restart_call_prepare(task);
261 return -EAGAIN;
262 }
263
264 return 0;
265}
266
267/*
268 * We reference the rpc_cred of the first WRITE that triggers the need for
269 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
270 * rfc5661 is not clear about which credential should be used.
271 */
272static void
273filelayout_set_layoutcommit(struct nfs_write_data *wdata)
274{
275 struct nfs_pgio_header *hdr = wdata->header;
276
277 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
278 wdata->res.verf->committed == NFS_FILE_SYNC)
279 return;
280
281 pnfs_set_layoutcommit(wdata);
282 dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
283 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
284}
285
286bool
287filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
288{
289 return filelayout_test_devid_invalid(node) ||
290 nfs4_test_deviceid_unavailable(node);
291}
292
293static bool
294filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
295{
296 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
297
298 return filelayout_test_devid_unavailable(node);
299}
300
301/*
302 * Call ops for the async read/write cases
303 * In the case of dense layouts, the offset needs to be reset to its
304 * original value.
305 */
306static void filelayout_read_prepare(struct rpc_task *task, void *data)
307{
308 struct nfs_read_data *rdata = data;
309
310 if (unlikely(test_bit(NFS_CONTEXT_BAD, &rdata->args.context->flags))) {
311 rpc_exit(task, -EIO);
312 return;
313 }
314 if (filelayout_reset_to_mds(rdata->header->lseg)) {
315 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
316 filelayout_reset_read(rdata);
317 rpc_exit(task, 0);
318 return;
319 }
320 rdata->read_done_cb = filelayout_read_done_cb;
321
322 if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
323 &rdata->args.seq_args,
324 &rdata->res.seq_res,
325 task))
326 return;
327 if (nfs4_set_rw_stateid(&rdata->args.stateid, rdata->args.context,
328 rdata->args.lock_context, FMODE_READ) == -EIO)
329 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
330}
331
332static void filelayout_read_call_done(struct rpc_task *task, void *data)
333{
334 struct nfs_read_data *rdata = data;
335
336 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
337
338 if (test_bit(NFS_IOHDR_REDO, &rdata->header->flags) &&
339 task->tk_status == 0) {
340 nfs41_sequence_done(task, &rdata->res.seq_res);
341 return;
342 }
343
344 /* Note this may cause RPC to be resent */
345 rdata->header->mds_ops->rpc_call_done(task, data);
346}
347
348static void filelayout_read_count_stats(struct rpc_task *task, void *data)
349{
350 struct nfs_read_data *rdata = data;
351
352 rpc_count_iostats(task, NFS_SERVER(rdata->header->inode)->client->cl_metrics);
353}
354
355static void filelayout_read_release(void *data)
356{
357 struct nfs_read_data *rdata = data;
358 struct pnfs_layout_hdr *lo = rdata->header->lseg->pls_layout;
359
360 filelayout_fenceme(lo->plh_inode, lo);
361 nfs_put_client(rdata->ds_clp);
362 rdata->header->mds_ops->rpc_release(data);
363}
364
365static int filelayout_write_done_cb(struct rpc_task *task,
366 struct nfs_write_data *data)
367{
368 struct nfs_pgio_header *hdr = data->header;
369 int err;
370
371 trace_nfs4_pnfs_write(data, task->tk_status);
372 err = filelayout_async_handle_error(task, data->args.context->state,
373 data->ds_clp, hdr->lseg);
374
375 switch (err) {
376 case -NFS4ERR_RESET_TO_MDS:
377 filelayout_reset_write(data);
378 return task->tk_status;
379 case -EAGAIN:
380 rpc_restart_call_prepare(task);
381 return -EAGAIN;
382 }
383
384 filelayout_set_layoutcommit(data);
385 return 0;
386}
387
388/* Fake up some data that will cause nfs_commit_release to retry the writes. */
389static void prepare_to_resend_writes(struct nfs_commit_data *data)
390{
391 struct nfs_page *first = nfs_list_entry(data->pages.next);
392
393 data->task.tk_status = 0;
394 memcpy(&data->verf.verifier, &first->wb_verf,
395 sizeof(data->verf.verifier));
396 data->verf.verifier.data[0]++; /* ensure verifier mismatch */
397}
398
399static int filelayout_commit_done_cb(struct rpc_task *task,
400 struct nfs_commit_data *data)
401{
402 int err;
403
404 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
405 err = filelayout_async_handle_error(task, NULL, data->ds_clp,
406 data->lseg);
407
408 switch (err) {
409 case -NFS4ERR_RESET_TO_MDS:
410 prepare_to_resend_writes(data);
411 return -EAGAIN;
412 case -EAGAIN:
413 rpc_restart_call_prepare(task);
414 return -EAGAIN;
415 }
416
417 return 0;
418}
419
420static void filelayout_write_prepare(struct rpc_task *task, void *data)
421{
422 struct nfs_write_data *wdata = data;
423
424 if (unlikely(test_bit(NFS_CONTEXT_BAD, &wdata->args.context->flags))) {
425 rpc_exit(task, -EIO);
426 return;
427 }
428 if (filelayout_reset_to_mds(wdata->header->lseg)) {
429 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
430 filelayout_reset_write(wdata);
431 rpc_exit(task, 0);
432 return;
433 }
434 if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
435 &wdata->args.seq_args,
436 &wdata->res.seq_res,
437 task))
438 return;
439 if (nfs4_set_rw_stateid(&wdata->args.stateid, wdata->args.context,
440 wdata->args.lock_context, FMODE_WRITE) == -EIO)
441 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
442}
443
444static void filelayout_write_call_done(struct rpc_task *task, void *data)
445{
446 struct nfs_write_data *wdata = data;
447
448 if (test_bit(NFS_IOHDR_REDO, &wdata->header->flags) &&
449 task->tk_status == 0) {
450 nfs41_sequence_done(task, &wdata->res.seq_res);
451 return;
452 }
453
454 /* Note this may cause RPC to be resent */
455 wdata->header->mds_ops->rpc_call_done(task, data);
456}
457
458static void filelayout_write_count_stats(struct rpc_task *task, void *data)
459{
460 struct nfs_write_data *wdata = data;
461
462 rpc_count_iostats(task, NFS_SERVER(wdata->header->inode)->client->cl_metrics);
463}
464
465static void filelayout_write_release(void *data)
466{
467 struct nfs_write_data *wdata = data;
468 struct pnfs_layout_hdr *lo = wdata->header->lseg->pls_layout;
469
470 filelayout_fenceme(lo->plh_inode, lo);
471 nfs_put_client(wdata->ds_clp);
472 wdata->header->mds_ops->rpc_release(data);
473}
474
475static void filelayout_commit_prepare(struct rpc_task *task, void *data)
476{
477 struct nfs_commit_data *wdata = data;
478
479 nfs41_setup_sequence(wdata->ds_clp->cl_session,
480 &wdata->args.seq_args,
481 &wdata->res.seq_res,
482 task);
483}
484
485static void filelayout_write_commit_done(struct rpc_task *task, void *data)
486{
487 struct nfs_commit_data *wdata = data;
488
489 /* Note this may cause RPC to be resent */
490 wdata->mds_ops->rpc_call_done(task, data);
491}
492
493static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
494{
495 struct nfs_commit_data *cdata = data;
496
497 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
498}
499
500static void filelayout_commit_release(void *calldata)
501{
502 struct nfs_commit_data *data = calldata;
503
504 data->completion_ops->completion(data);
505 pnfs_put_lseg(data->lseg);
506 nfs_put_client(data->ds_clp);
507 nfs_commitdata_release(data);
508}
509
510static const struct rpc_call_ops filelayout_read_call_ops = {
511 .rpc_call_prepare = filelayout_read_prepare,
512 .rpc_call_done = filelayout_read_call_done,
513 .rpc_count_stats = filelayout_read_count_stats,
514 .rpc_release = filelayout_read_release,
515};
516
517static const struct rpc_call_ops filelayout_write_call_ops = {
518 .rpc_call_prepare = filelayout_write_prepare,
519 .rpc_call_done = filelayout_write_call_done,
520 .rpc_count_stats = filelayout_write_count_stats,
521 .rpc_release = filelayout_write_release,
522};
523
524static const struct rpc_call_ops filelayout_commit_call_ops = {
525 .rpc_call_prepare = filelayout_commit_prepare,
526 .rpc_call_done = filelayout_write_commit_done,
527 .rpc_count_stats = filelayout_commit_count_stats,
528 .rpc_release = filelayout_commit_release,
529};
530
531static enum pnfs_try_status
532filelayout_read_pagelist(struct nfs_read_data *data)
533{
534 struct nfs_pgio_header *hdr = data->header;
535 struct pnfs_layout_segment *lseg = hdr->lseg;
536 struct nfs4_pnfs_ds *ds;
537 struct rpc_clnt *ds_clnt;
538 loff_t offset = data->args.offset;
539 u32 j, idx;
540 struct nfs_fh *fh;
541
542 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
543 __func__, hdr->inode->i_ino,
544 data->args.pgbase, (size_t)data->args.count, offset);
545
546 /* Retrieve the correct rpc_client for the byte range */
547 j = nfs4_fl_calc_j_index(lseg, offset);
548 idx = nfs4_fl_calc_ds_index(lseg, j);
549 ds = nfs4_fl_prepare_ds(lseg, idx);
550 if (!ds)
551 return PNFS_NOT_ATTEMPTED;
552
553 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
554 if (IS_ERR(ds_clnt))
555 return PNFS_NOT_ATTEMPTED;
556
557 dprintk("%s USE DS: %s cl_count %d\n", __func__,
558 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
559
560 /* No multipath support. Use first DS */
561 atomic_inc(&ds->ds_clp->cl_count);
562 data->ds_clp = ds->ds_clp;
563 fh = nfs4_fl_select_ds_fh(lseg, j);
564 if (fh)
565 data->args.fh = fh;
566
567 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
568 data->mds_offset = offset;
569
570 /* Perform an asynchronous read to ds */
571 nfs_initiate_read(ds_clnt, data,
572 &filelayout_read_call_ops, RPC_TASK_SOFTCONN);
573 return PNFS_ATTEMPTED;
574}
575
576/* Perform async writes. */
577static enum pnfs_try_status
578filelayout_write_pagelist(struct nfs_write_data *data, int sync)
579{
580 struct nfs_pgio_header *hdr = data->header;
581 struct pnfs_layout_segment *lseg = hdr->lseg;
582 struct nfs4_pnfs_ds *ds;
583 struct rpc_clnt *ds_clnt;
584 loff_t offset = data->args.offset;
585 u32 j, idx;
586 struct nfs_fh *fh;
587
588 /* Retrieve the correct rpc_client for the byte range */
589 j = nfs4_fl_calc_j_index(lseg, offset);
590 idx = nfs4_fl_calc_ds_index(lseg, j);
591 ds = nfs4_fl_prepare_ds(lseg, idx);
592 if (!ds)
593 return PNFS_NOT_ATTEMPTED;
594
595 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
596 if (IS_ERR(ds_clnt))
597 return PNFS_NOT_ATTEMPTED;
598
599 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
600 __func__, hdr->inode->i_ino, sync, (size_t) data->args.count,
601 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
602
603 data->write_done_cb = filelayout_write_done_cb;
604 atomic_inc(&ds->ds_clp->cl_count);
605 data->ds_clp = ds->ds_clp;
606 fh = nfs4_fl_select_ds_fh(lseg, j);
607 if (fh)
608 data->args.fh = fh;
609 /*
610 * Get the file offset on the dserver. Set the write offset to
611 * this offset and save the original offset.
612 */
613 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
614
615 /* Perform an asynchronous write */
616 nfs_initiate_write(ds_clnt, data,
617 &filelayout_write_call_ops, sync,
618 RPC_TASK_SOFTCONN);
619 return PNFS_ATTEMPTED;
620}
621
622/*
623 * filelayout_check_layout()
624 *
625 * Make sure layout segment parameters are sane WRT the device.
626 * At this point no generic layer initialization of the lseg has occurred,
627 * and nothing has been added to the layout_hdr cache.
628 *
629 */
630static int
631filelayout_check_layout(struct pnfs_layout_hdr *lo,
632 struct nfs4_filelayout_segment *fl,
633 struct nfs4_layoutget_res *lgr,
634 struct nfs4_deviceid *id,
635 gfp_t gfp_flags)
636{
637 struct nfs4_deviceid_node *d;
638 struct nfs4_file_layout_dsaddr *dsaddr;
639 int status = -EINVAL;
640 struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
641
642 dprintk("--> %s\n", __func__);
643
644 /* FIXME: remove this check when layout segment support is added */
645 if (lgr->range.offset != 0 ||
646 lgr->range.length != NFS4_MAX_UINT64) {
647 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
648 __func__);
649 goto out;
650 }
651
652 if (fl->pattern_offset > lgr->range.offset) {
653 dprintk("%s pattern_offset %lld too large\n",
654 __func__, fl->pattern_offset);
655 goto out;
656 }
657
658 if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
659 dprintk("%s Invalid stripe unit (%u)\n",
660 __func__, fl->stripe_unit);
661 goto out;
662 }
663
664 /* find and reference the deviceid */
665 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
666 NFS_SERVER(lo->plh_inode)->nfs_client, id);
667 if (d == NULL) {
668 dsaddr = filelayout_get_device_info(lo->plh_inode, id,
669 lo->plh_lc_cred, gfp_flags);
670 if (dsaddr == NULL)
671 goto out;
672 } else
673 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
674 /* Found deviceid is unavailable */
675 if (filelayout_test_devid_unavailable(&dsaddr->id_node))
676 goto out_put;
677
678 fl->dsaddr = dsaddr;
679
680 if (fl->first_stripe_index >= dsaddr->stripe_count) {
681 dprintk("%s Bad first_stripe_index %u\n",
682 __func__, fl->first_stripe_index);
683 goto out_put;
684 }
685
686 if ((fl->stripe_type == STRIPE_SPARSE &&
687 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
688 (fl->stripe_type == STRIPE_DENSE &&
689 fl->num_fh != dsaddr->stripe_count)) {
690 dprintk("%s num_fh %u not valid for given packing\n",
691 __func__, fl->num_fh);
692 goto out_put;
693 }
694
695 if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
696 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
697 "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
698 nfss->wsize);
699 }
700
701 status = 0;
702out:
703 dprintk("--> %s returns %d\n", __func__, status);
704 return status;
705out_put:
706 nfs4_fl_put_deviceid(dsaddr);
707 goto out;
708}
709
710static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
711{
712 int i;
713
714 for (i = 0; i < fl->num_fh; i++) {
715 if (!fl->fh_array[i])
716 break;
717 kfree(fl->fh_array[i]);
718 }
719 kfree(fl->fh_array);
720 fl->fh_array = NULL;
721}
722
723static void
724_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
725{
726 filelayout_free_fh_array(fl);
727 kfree(fl);
728}
729
730static int
731filelayout_decode_layout(struct pnfs_layout_hdr *flo,
732 struct nfs4_filelayout_segment *fl,
733 struct nfs4_layoutget_res *lgr,
734 struct nfs4_deviceid *id,
735 gfp_t gfp_flags)
736{
737 struct xdr_stream stream;
738 struct xdr_buf buf;
739 struct page *scratch;
740 __be32 *p;
741 uint32_t nfl_util;
742 int i;
743
744 dprintk("%s: set_layout_map Begin\n", __func__);
745
746 scratch = alloc_page(gfp_flags);
747 if (!scratch)
748 return -ENOMEM;
749
750 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
751 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
752
753 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
754 * num_fh (4) */
755 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
756 if (unlikely(!p))
757 goto out_err;
758
759 memcpy(id, p, sizeof(*id));
760 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
761 nfs4_print_deviceid(id);
762
763 nfl_util = be32_to_cpup(p++);
764 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
765 fl->commit_through_mds = 1;
766 if (nfl_util & NFL4_UFLG_DENSE)
767 fl->stripe_type = STRIPE_DENSE;
768 else
769 fl->stripe_type = STRIPE_SPARSE;
770 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
771
772 fl->first_stripe_index = be32_to_cpup(p++);
773 p = xdr_decode_hyper(p, &fl->pattern_offset);
774 fl->num_fh = be32_to_cpup(p++);
775
776 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
777 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
778 fl->pattern_offset);
779
780 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
781 * Futher checking is done in filelayout_check_layout */
782 if (fl->num_fh >
783 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
784 goto out_err;
785
786 if (fl->num_fh > 0) {
787 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
788 gfp_flags);
789 if (!fl->fh_array)
790 goto out_err;
791 }
792
793 for (i = 0; i < fl->num_fh; i++) {
794 /* Do we want to use a mempool here? */
795 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
796 if (!fl->fh_array[i])
797 goto out_err_free;
798
799 p = xdr_inline_decode(&stream, 4);
800 if (unlikely(!p))
801 goto out_err_free;
802 fl->fh_array[i]->size = be32_to_cpup(p++);
803 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
804 printk(KERN_ERR "NFS: Too big fh %d received %d\n",
805 i, fl->fh_array[i]->size);
806 goto out_err_free;
807 }
808
809 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
810 if (unlikely(!p))
811 goto out_err_free;
812 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
813 dprintk("DEBUG: %s: fh len %d\n", __func__,
814 fl->fh_array[i]->size);
815 }
816
817 __free_page(scratch);
818 return 0;
819
820out_err_free:
821 filelayout_free_fh_array(fl);
822out_err:
823 __free_page(scratch);
824 return -EIO;
825}
826
827static void
828filelayout_free_lseg(struct pnfs_layout_segment *lseg)
829{
830 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
831
832 dprintk("--> %s\n", __func__);
833 nfs4_fl_put_deviceid(fl->dsaddr);
834 /* This assumes a single RW lseg */
835 if (lseg->pls_range.iomode == IOMODE_RW) {
836 struct nfs4_filelayout *flo;
837
838 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
839 flo->commit_info.nbuckets = 0;
840 kfree(flo->commit_info.buckets);
841 flo->commit_info.buckets = NULL;
842 }
843 _filelayout_free_lseg(fl);
844}
845
846static int
847filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
848 struct nfs_commit_info *cinfo,
849 gfp_t gfp_flags)
850{
851 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
852 struct pnfs_commit_bucket *buckets;
853 int size;
854
855 if (fl->commit_through_mds)
856 return 0;
857 if (cinfo->ds->nbuckets != 0) {
858 /* This assumes there is only one IOMODE_RW lseg. What
859 * we really want to do is have a layout_hdr level
860 * dictionary of <multipath_list4, fh> keys, each
861 * associated with a struct list_head, populated by calls
862 * to filelayout_write_pagelist().
863 * */
864 return 0;
865 }
866
867 size = (fl->stripe_type == STRIPE_SPARSE) ?
868 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
869
870 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
871 gfp_flags);
872 if (!buckets)
873 return -ENOMEM;
874 else {
875 int i;
876
877 spin_lock(cinfo->lock);
878 if (cinfo->ds->nbuckets != 0)
879 kfree(buckets);
880 else {
881 cinfo->ds->buckets = buckets;
882 cinfo->ds->nbuckets = size;
883 for (i = 0; i < size; i++) {
884 INIT_LIST_HEAD(&buckets[i].written);
885 INIT_LIST_HEAD(&buckets[i].committing);
886 }
887 }
888 spin_unlock(cinfo->lock);
889 return 0;
890 }
891}
892
893static struct pnfs_layout_segment *
894filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
895 struct nfs4_layoutget_res *lgr,
896 gfp_t gfp_flags)
897{
898 struct nfs4_filelayout_segment *fl;
899 int rc;
900 struct nfs4_deviceid id;
901
902 dprintk("--> %s\n", __func__);
903 fl = kzalloc(sizeof(*fl), gfp_flags);
904 if (!fl)
905 return NULL;
906
907 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
908 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
909 _filelayout_free_lseg(fl);
910 return NULL;
911 }
912 return &fl->generic_hdr;
913}
914
915/*
916 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
917 *
918 * return true : coalesce page
919 * return false : don't coalesce page
920 */
921static bool
922filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
923 struct nfs_page *req)
924{
925 u64 p_stripe, r_stripe;
926 u32 stripe_unit;
927
928 if (!pnfs_generic_pg_test(pgio, prev, req) ||
929 !nfs_generic_pg_test(pgio, prev, req))
930 return false;
931
932 p_stripe = (u64)req_offset(prev);
933 r_stripe = (u64)req_offset(req);
934 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
935
936 do_div(p_stripe, stripe_unit);
937 do_div(r_stripe, stripe_unit);
938
939 return (p_stripe == r_stripe);
940}
941
942static void
943filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
944 struct nfs_page *req)
945{
946 WARN_ON_ONCE(pgio->pg_lseg != NULL);
947
948 if (req->wb_offset != req->wb_pgbase) {
949 /*
950 * Handling unaligned pages is difficult, because have to
951 * somehow split a req in two in certain cases in the
952 * pg.test code. Avoid this by just not using pnfs
953 * in this case.
954 */
955 nfs_pageio_reset_read_mds(pgio);
956 return;
957 }
958 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
959 req->wb_context,
960 0,
961 NFS4_MAX_UINT64,
962 IOMODE_READ,
963 GFP_KERNEL);
964 /* If no lseg, fall back to read through mds */
965 if (pgio->pg_lseg == NULL)
966 nfs_pageio_reset_read_mds(pgio);
967}
968
969static void
970filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
971 struct nfs_page *req)
972{
973 struct nfs_commit_info cinfo;
974 int status;
975
976 WARN_ON_ONCE(pgio->pg_lseg != NULL);
977
978 if (req->wb_offset != req->wb_pgbase)
979 goto out_mds;
980 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
981 req->wb_context,
982 0,
983 NFS4_MAX_UINT64,
984 IOMODE_RW,
985 GFP_NOFS);
986 /* If no lseg, fall back to write through mds */
987 if (pgio->pg_lseg == NULL)
988 goto out_mds;
989 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
990 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
991 if (status < 0) {
992 pnfs_put_lseg(pgio->pg_lseg);
993 pgio->pg_lseg = NULL;
994 goto out_mds;
995 }
996 return;
997out_mds:
998 nfs_pageio_reset_write_mds(pgio);
999}
1000
1001static const struct nfs_pageio_ops filelayout_pg_read_ops = {
1002 .pg_init = filelayout_pg_init_read,
1003 .pg_test = filelayout_pg_test,
1004 .pg_doio = pnfs_generic_pg_readpages,
1005};
1006
1007static const struct nfs_pageio_ops filelayout_pg_write_ops = {
1008 .pg_init = filelayout_pg_init_write,
1009 .pg_test = filelayout_pg_test,
1010 .pg_doio = pnfs_generic_pg_writepages,
1011};
1012
1013static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
1014{
1015 if (fl->stripe_type == STRIPE_SPARSE)
1016 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
1017 else
1018 return j;
1019}
1020
1021/* The generic layer is about to remove the req from the commit list.
1022 * If this will make the bucket empty, it will need to put the lseg reference.
1023 */
1024static void
1025filelayout_clear_request_commit(struct nfs_page *req,
1026 struct nfs_commit_info *cinfo)
1027{
1028 struct pnfs_layout_segment *freeme = NULL;
1029
1030 spin_lock(cinfo->lock);
1031 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
1032 goto out;
1033 cinfo->ds->nwritten--;
1034 if (list_is_singular(&req->wb_list)) {
1035 struct pnfs_commit_bucket *bucket;
1036
1037 bucket = list_first_entry(&req->wb_list,
1038 struct pnfs_commit_bucket,
1039 written);
1040 freeme = bucket->wlseg;
1041 bucket->wlseg = NULL;
1042 }
1043out:
1044 nfs_request_remove_commit_list(req, cinfo);
1045 spin_unlock(cinfo->lock);
1046 pnfs_put_lseg(freeme);
1047}
1048
1049static struct list_head *
1050filelayout_choose_commit_list(struct nfs_page *req,
1051 struct pnfs_layout_segment *lseg,
1052 struct nfs_commit_info *cinfo)
1053{
1054 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
1055 u32 i, j;
1056 struct list_head *list;
1057 struct pnfs_commit_bucket *buckets;
1058
1059 if (fl->commit_through_mds)
1060 return &cinfo->mds->list;
1061
1062 /* Note that we are calling nfs4_fl_calc_j_index on each page
1063 * that ends up being committed to a data server. An attractive
1064 * alternative is to add a field to nfs_write_data and nfs_page
1065 * to store the value calculated in filelayout_write_pagelist
1066 * and just use that here.
1067 */
1068 j = nfs4_fl_calc_j_index(lseg, req_offset(req));
1069 i = select_bucket_index(fl, j);
1070 buckets = cinfo->ds->buckets;
1071 list = &buckets[i].written;
1072 if (list_empty(list)) {
1073 /* Non-empty buckets hold a reference on the lseg. That ref
1074 * is normally transferred to the COMMIT call and released
1075 * there. It could also be released if the last req is pulled
1076 * off due to a rewrite, in which case it will be done in
1077 * filelayout_clear_request_commit
1078 */
1079 buckets[i].wlseg = pnfs_get_lseg(lseg);
1080 }
1081 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1082 cinfo->ds->nwritten++;
1083 return list;
1084}
1085
1086static void
1087filelayout_mark_request_commit(struct nfs_page *req,
1088 struct pnfs_layout_segment *lseg,
1089 struct nfs_commit_info *cinfo)
1090{
1091 struct list_head *list;
1092
1093 list = filelayout_choose_commit_list(req, lseg, cinfo);
1094 nfs_request_add_commit_list(req, list, cinfo);
1095}
1096
1097static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1098{
1099 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1100
1101 if (flseg->stripe_type == STRIPE_SPARSE)
1102 return i;
1103 else
1104 return nfs4_fl_calc_ds_index(lseg, i);
1105}
1106
1107static struct nfs_fh *
1108select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1109{
1110 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1111
1112 if (flseg->stripe_type == STRIPE_SPARSE) {
1113 if (flseg->num_fh == 1)
1114 i = 0;
1115 else if (flseg->num_fh == 0)
1116 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1117 return NULL;
1118 }
1119 return flseg->fh_array[i];
1120}
1121
1122static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1123{
1124 struct pnfs_layout_segment *lseg = data->lseg;
1125 struct nfs4_pnfs_ds *ds;
1126 struct rpc_clnt *ds_clnt;
1127 u32 idx;
1128 struct nfs_fh *fh;
1129
1130 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1131 ds = nfs4_fl_prepare_ds(lseg, idx);
1132 if (!ds)
1133 goto out_err;
1134
1135 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode);
1136 if (IS_ERR(ds_clnt))
1137 goto out_err;
1138
1139 dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1140 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1141 data->commit_done_cb = filelayout_commit_done_cb;
1142 atomic_inc(&ds->ds_clp->cl_count);
1143 data->ds_clp = ds->ds_clp;
1144 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1145 if (fh)
1146 data->args.fh = fh;
1147 return nfs_initiate_commit(ds_clnt, data,
1148 &filelayout_commit_call_ops, how,
1149 RPC_TASK_SOFTCONN);
1150out_err:
1151 prepare_to_resend_writes(data);
1152 filelayout_commit_release(data);
1153 return -EAGAIN;
1154}
1155
1156static int
1157transfer_commit_list(struct list_head *src, struct list_head *dst,
1158 struct nfs_commit_info *cinfo, int max)
1159{
1160 struct nfs_page *req, *tmp;
1161 int ret = 0;
1162
1163 list_for_each_entry_safe(req, tmp, src, wb_list) {
1164 if (!nfs_lock_request(req))
1165 continue;
1166 kref_get(&req->wb_kref);
1167 if (cond_resched_lock(cinfo->lock))
1168 list_safe_reset_next(req, tmp, wb_list);
1169 nfs_request_remove_commit_list(req, cinfo);
1170 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1171 nfs_list_add_request(req, dst);
1172 ret++;
1173 if ((ret == max) && !cinfo->dreq)
1174 break;
1175 }
1176 return ret;
1177}
1178
1179static int
1180filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
1181 struct nfs_commit_info *cinfo,
1182 int max)
1183{
1184 struct list_head *src = &bucket->written;
1185 struct list_head *dst = &bucket->committing;
1186 int ret;
1187
1188 ret = transfer_commit_list(src, dst, cinfo, max);
1189 if (ret) {
1190 cinfo->ds->nwritten -= ret;
1191 cinfo->ds->ncommitting += ret;
1192 bucket->clseg = bucket->wlseg;
1193 if (list_empty(src))
1194 bucket->wlseg = NULL;
1195 else
1196 pnfs_get_lseg(bucket->clseg);
1197 }
1198 return ret;
1199}
1200
1201/* Move reqs from written to committing lists, returning count of number moved.
1202 * Note called with cinfo->lock held.
1203 */
1204static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo,
1205 int max)
1206{
1207 int i, rv = 0, cnt;
1208
1209 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
1210 cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i],
1211 cinfo, max);
1212 max -= cnt;
1213 rv += cnt;
1214 }
1215 return rv;
1216}
1217
1218/* Pull everything off the committing lists and dump into @dst */
1219static void filelayout_recover_commit_reqs(struct list_head *dst,
1220 struct nfs_commit_info *cinfo)
1221{
1222 struct pnfs_commit_bucket *b;
1223 int i;
1224
1225 spin_lock(cinfo->lock);
1226 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1227 if (transfer_commit_list(&b->written, dst, cinfo, 0)) {
1228 spin_unlock(cinfo->lock);
1229 pnfs_put_lseg(b->wlseg);
1230 b->wlseg = NULL;
1231 spin_lock(cinfo->lock);
1232 }
1233 }
1234 cinfo->ds->nwritten = 0;
1235 spin_unlock(cinfo->lock);
1236}
1237
1238static unsigned int
1239alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list)
1240{
1241 struct pnfs_ds_commit_info *fl_cinfo;
1242 struct pnfs_commit_bucket *bucket;
1243 struct nfs_commit_data *data;
1244 int i, j;
1245 unsigned int nreq = 0;
1246
1247 fl_cinfo = cinfo->ds;
1248 bucket = fl_cinfo->buckets;
1249 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
1250 if (list_empty(&bucket->committing))
1251 continue;
1252 data = nfs_commitdata_alloc();
1253 if (!data)
1254 break;
1255 data->ds_commit_index = i;
1256 data->lseg = bucket->clseg;
1257 bucket->clseg = NULL;
1258 list_add(&data->pages, list);
1259 nreq++;
1260 }
1261
1262 /* Clean up on error */
1263 for (j = i; j < fl_cinfo->nbuckets; j++, bucket++) {
1264 if (list_empty(&bucket->committing))
1265 continue;
1266 nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo);
1267 pnfs_put_lseg(bucket->clseg);
1268 bucket->clseg = NULL;
1269 }
1270 /* Caller will clean up entries put on list */
1271 return nreq;
1272}
1273
1274/* This follows nfs_commit_list pretty closely */
1275static int
1276filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1277 int how, struct nfs_commit_info *cinfo)
1278{
1279 struct nfs_commit_data *data, *tmp;
1280 LIST_HEAD(list);
1281 unsigned int nreq = 0;
1282
1283 if (!list_empty(mds_pages)) {
1284 data = nfs_commitdata_alloc();
1285 if (data != NULL) {
1286 data->lseg = NULL;
1287 list_add(&data->pages, &list);
1288 nreq++;
1289 } else
1290 nfs_retry_commit(mds_pages, NULL, cinfo);
1291 }
1292
1293 nreq += alloc_ds_commits(cinfo, &list);
1294
1295 if (nreq == 0) {
1296 cinfo->completion_ops->error_cleanup(NFS_I(inode));
1297 goto out;
1298 }
1299
1300 atomic_add(nreq, &cinfo->mds->rpcs_out);
1301
1302 list_for_each_entry_safe(data, tmp, &list, pages) {
1303 list_del_init(&data->pages);
1304 if (!data->lseg) {
1305 nfs_init_commit(data, mds_pages, NULL, cinfo);
1306 nfs_initiate_commit(NFS_CLIENT(inode), data,
1307 data->mds_ops, how, 0);
1308 } else {
1309 struct pnfs_commit_bucket *buckets;
1310
1311 buckets = cinfo->ds->buckets;
1312 nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo);
1313 filelayout_initiate_commit(data, how);
1314 }
1315 }
1316out:
1317 cinfo->ds->ncommitting = 0;
1318 return PNFS_ATTEMPTED;
1319}
1320
1321static void
1322filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1323{
1324 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1325}
1326
1327static struct pnfs_layout_hdr *
1328filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1329{
1330 struct nfs4_filelayout *flo;
1331
1332 flo = kzalloc(sizeof(*flo), gfp_flags);
1333 return &flo->generic_hdr;
1334}
1335
1336static void
1337filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1338{
1339 kfree(FILELAYOUT_FROM_HDR(lo));
1340}
1341
1342static struct pnfs_ds_commit_info *
1343filelayout_get_ds_info(struct inode *inode)
1344{
1345 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1346
1347 if (layout == NULL)
1348 return NULL;
1349 else
1350 return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1351}
1352
1353static struct pnfs_layoutdriver_type filelayout_type = {
1354 .id = LAYOUT_NFSV4_1_FILES,
1355 .name = "LAYOUT_NFSV4_1_FILES",
1356 .owner = THIS_MODULE,
1357 .alloc_layout_hdr = filelayout_alloc_layout_hdr,
1358 .free_layout_hdr = filelayout_free_layout_hdr,
1359 .alloc_lseg = filelayout_alloc_lseg,
1360 .free_lseg = filelayout_free_lseg,
1361 .pg_read_ops = &filelayout_pg_read_ops,
1362 .pg_write_ops = &filelayout_pg_write_ops,
1363 .get_ds_info = &filelayout_get_ds_info,
1364 .mark_request_commit = filelayout_mark_request_commit,
1365 .clear_request_commit = filelayout_clear_request_commit,
1366 .scan_commit_lists = filelayout_scan_commit_lists,
1367 .recover_commit_reqs = filelayout_recover_commit_reqs,
1368 .commit_pagelist = filelayout_commit_pagelist,
1369 .read_pagelist = filelayout_read_pagelist,
1370 .write_pagelist = filelayout_write_pagelist,
1371 .free_deviceid_node = filelayout_free_deveiceid_node,
1372};
1373
1374static int __init nfs4filelayout_init(void)
1375{
1376 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1377 __func__);
1378 return pnfs_register_layoutdriver(&filelayout_type);
1379}
1380
1381static void __exit nfs4filelayout_exit(void)
1382{
1383 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1384 __func__);
1385 pnfs_unregister_layoutdriver(&filelayout_type);
1386}
1387
1388MODULE_ALIAS("nfs-layouttype4-1");
1389
1390module_init(nfs4filelayout_init);
1391module_exit(nfs4filelayout_exit);