49eeb044c109c0bb3c3878db7b8b60a780b50f97
[linux-3.10.git] / fs / nfs / nfs4filelayout.c
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
43 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
44
45 MODULE_LICENSE("GPL");
46 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
47 MODULE_DESCRIPTION("The NFSv4 file layout driver");
48
49 #define FILELAYOUT_POLL_RETRY_MAX     (15*HZ)
50
51 static loff_t
52 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
53                             loff_t offset)
54 {
55         u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
56         u64 stripe_no;
57         u32 rem;
58
59         offset -= flseg->pattern_offset;
60         stripe_no = div_u64(offset, stripe_width);
61         div_u64_rem(offset, flseg->stripe_unit, &rem);
62
63         return stripe_no * flseg->stripe_unit + rem;
64 }
65
66 /* This function is used by the layout driver to calculate the
67  * offset of the file on the dserver based on whether the
68  * layout type is STRIPE_DENSE or STRIPE_SPARSE
69  */
70 static loff_t
71 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
72 {
73         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
74
75         switch (flseg->stripe_type) {
76         case STRIPE_SPARSE:
77                 return offset;
78
79         case STRIPE_DENSE:
80                 return filelayout_get_dense_offset(flseg, offset);
81         }
82
83         BUG();
84 }
85
86 static void filelayout_reset_write(struct nfs_write_data *data)
87 {
88         struct nfs_pgio_header *hdr = data->header;
89         struct rpc_task *task = &data->task;
90
91         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
92                 dprintk("%s Reset task %5u for i/o through MDS "
93                         "(req %s/%lld, %u bytes @ offset %llu)\n", __func__,
94                         data->task.tk_pid,
95                         hdr->inode->i_sb->s_id,
96                         (long long)NFS_FILEID(hdr->inode),
97                         data->args.count,
98                         (unsigned long long)data->args.offset);
99
100                 task->tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
101                                                         &hdr->pages,
102                                                         hdr->completion_ops,
103                                                         hdr->dreq);
104         }
105 }
106
107 static void filelayout_reset_read(struct nfs_read_data *data)
108 {
109         struct nfs_pgio_header *hdr = data->header;
110         struct rpc_task *task = &data->task;
111
112         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
113                 dprintk("%s Reset task %5u for i/o through MDS "
114                         "(req %s/%lld, %u bytes @ offset %llu)\n", __func__,
115                         data->task.tk_pid,
116                         hdr->inode->i_sb->s_id,
117                         (long long)NFS_FILEID(hdr->inode),
118                         data->args.count,
119                         (unsigned long long)data->args.offset);
120
121                 task->tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
122                                                         &hdr->pages,
123                                                         hdr->completion_ops,
124                                                         hdr->dreq);
125         }
126 }
127
128 static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo)
129 {
130         if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
131                 return;
132         clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);
133         pnfs_return_layout(inode);
134 }
135
136 static 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                 nfs4_schedule_stateid_recovery(mds_server, state);
163                 goto wait_on_recovery;
164         case -NFS4ERR_EXPIRED:
165                 if (state != NULL)
166                         nfs4_schedule_stateid_recovery(mds_server, state);
167                 nfs4_schedule_lease_recovery(mds_client);
168                 goto wait_on_recovery;
169         /* DS session errors */
170         case -NFS4ERR_BADSESSION:
171         case -NFS4ERR_BADSLOT:
172         case -NFS4ERR_BAD_HIGH_SLOT:
173         case -NFS4ERR_DEADSESSION:
174         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
175         case -NFS4ERR_SEQ_FALSE_RETRY:
176         case -NFS4ERR_SEQ_MISORDERED:
177                 dprintk("%s ERROR %d, Reset session. Exchangeid "
178                         "flags 0x%x\n", __func__, task->tk_status,
179                         clp->cl_exchange_flags);
180                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
181                 break;
182         case -NFS4ERR_DELAY:
183         case -NFS4ERR_GRACE:
184                 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
185                 break;
186         case -NFS4ERR_RETRY_UNCACHED_REP:
187                 break;
188         /* Invalidate Layout errors */
189         case -NFS4ERR_PNFS_NO_LAYOUT:
190         case -ESTALE:           /* mapped NFS4ERR_STALE */
191         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
192         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
193         case -NFS4ERR_FHEXPIRED:
194         case -NFS4ERR_WRONG_TYPE:
195                 dprintk("%s Invalid layout error %d\n", __func__,
196                         task->tk_status);
197                 /*
198                  * Destroy layout so new i/o will get a new layout.
199                  * Layout will not be destroyed until all current lseg
200                  * references are put. Mark layout as invalid to resend failed
201                  * i/o and all i/o waiting on the slot table to the MDS until
202                  * layout is destroyed and a new valid layout is obtained.
203                  */
204                 pnfs_destroy_layout(NFS_I(inode));
205                 rpc_wake_up(&tbl->slot_tbl_waitq);
206                 goto reset;
207         /* RPC connection errors */
208         case -ECONNREFUSED:
209         case -EHOSTDOWN:
210         case -EHOSTUNREACH:
211         case -ENETUNREACH:
212         case -EIO:
213         case -ETIMEDOUT:
214         case -EPIPE:
215                 dprintk("%s DS connection error %d\n", __func__,
216                         task->tk_status);
217                 nfs4_mark_deviceid_unavailable(devid);
218                 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
219                 rpc_wake_up(&tbl->slot_tbl_waitq);
220                 /* fall through */
221         default:
222 reset:
223                 dprintk("%s Retry through MDS. Error %d\n", __func__,
224                         task->tk_status);
225                 return -NFS4ERR_RESET_TO_MDS;
226         }
227 out:
228         task->tk_status = 0;
229         return -EAGAIN;
230 wait_on_recovery:
231         rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
232         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
233                 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
234         goto out;
235 }
236
237 /* NFS_PROTO call done callback routines */
238
239 static int filelayout_read_done_cb(struct rpc_task *task,
240                                 struct nfs_read_data *data)
241 {
242         struct nfs_pgio_header *hdr = data->header;
243         int err;
244
245         err = filelayout_async_handle_error(task, data->args.context->state,
246                                             data->ds_clp, hdr->lseg);
247
248         switch (err) {
249         case -NFS4ERR_RESET_TO_MDS:
250                 filelayout_reset_read(data);
251                 return task->tk_status;
252         case -EAGAIN:
253                 rpc_restart_call_prepare(task);
254                 return -EAGAIN;
255         }
256
257         return 0;
258 }
259
260 /*
261  * We reference the rpc_cred of the first WRITE that triggers the need for
262  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
263  * rfc5661 is not clear about which credential should be used.
264  */
265 static void
266 filelayout_set_layoutcommit(struct nfs_write_data *wdata)
267 {
268         struct nfs_pgio_header *hdr = wdata->header;
269
270         if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
271             wdata->res.verf->committed == NFS_FILE_SYNC)
272                 return;
273
274         pnfs_set_layoutcommit(wdata);
275         dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
276                 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
277 }
278
279 bool
280 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
281 {
282         return filelayout_test_devid_invalid(node) ||
283                 nfs4_test_deviceid_unavailable(node);
284 }
285
286 static bool
287 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
288 {
289         struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
290
291         return filelayout_test_devid_unavailable(node);
292 }
293
294 /*
295  * Call ops for the async read/write cases
296  * In the case of dense layouts, the offset needs to be reset to its
297  * original value.
298  */
299 static void filelayout_read_prepare(struct rpc_task *task, void *data)
300 {
301         struct nfs_read_data *rdata = data;
302
303         if (filelayout_reset_to_mds(rdata->header->lseg)) {
304                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
305                 filelayout_reset_read(rdata);
306                 rpc_exit(task, 0);
307                 return;
308         }
309         rdata->read_done_cb = filelayout_read_done_cb;
310
311         nfs41_setup_sequence(rdata->ds_clp->cl_session,
312                         &rdata->args.seq_args,
313                         &rdata->res.seq_res,
314                         task);
315 }
316
317 static void filelayout_read_call_done(struct rpc_task *task, void *data)
318 {
319         struct nfs_read_data *rdata = data;
320
321         dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
322
323         if (test_bit(NFS_IOHDR_REDO, &rdata->header->flags) &&
324             task->tk_status == 0)
325                 return;
326
327         /* Note this may cause RPC to be resent */
328         rdata->header->mds_ops->rpc_call_done(task, data);
329 }
330
331 static void filelayout_read_count_stats(struct rpc_task *task, void *data)
332 {
333         struct nfs_read_data *rdata = data;
334
335         rpc_count_iostats(task, NFS_SERVER(rdata->header->inode)->client->cl_metrics);
336 }
337
338 static void filelayout_read_release(void *data)
339 {
340         struct nfs_read_data *rdata = data;
341         struct pnfs_layout_hdr *lo = rdata->header->lseg->pls_layout;
342
343         filelayout_fenceme(lo->plh_inode, lo);
344         nfs_put_client(rdata->ds_clp);
345         rdata->header->mds_ops->rpc_release(data);
346 }
347
348 static int filelayout_write_done_cb(struct rpc_task *task,
349                                 struct nfs_write_data *data)
350 {
351         struct nfs_pgio_header *hdr = data->header;
352         int err;
353
354         err = filelayout_async_handle_error(task, data->args.context->state,
355                                             data->ds_clp, hdr->lseg);
356
357         switch (err) {
358         case -NFS4ERR_RESET_TO_MDS:
359                 filelayout_reset_write(data);
360                 return task->tk_status;
361         case -EAGAIN:
362                 rpc_restart_call_prepare(task);
363                 return -EAGAIN;
364         }
365
366         filelayout_set_layoutcommit(data);
367         return 0;
368 }
369
370 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
371 static void prepare_to_resend_writes(struct nfs_commit_data *data)
372 {
373         struct nfs_page *first = nfs_list_entry(data->pages.next);
374
375         data->task.tk_status = 0;
376         memcpy(&data->verf.verifier, &first->wb_verf,
377                sizeof(data->verf.verifier));
378         data->verf.verifier.data[0]++; /* ensure verifier mismatch */
379 }
380
381 static int filelayout_commit_done_cb(struct rpc_task *task,
382                                      struct nfs_commit_data *data)
383 {
384         int err;
385
386         err = filelayout_async_handle_error(task, NULL, data->ds_clp,
387                                             data->lseg);
388
389         switch (err) {
390         case -NFS4ERR_RESET_TO_MDS:
391                 prepare_to_resend_writes(data);
392                 return -EAGAIN;
393         case -EAGAIN:
394                 rpc_restart_call_prepare(task);
395                 return -EAGAIN;
396         }
397
398         return 0;
399 }
400
401 static void filelayout_write_prepare(struct rpc_task *task, void *data)
402 {
403         struct nfs_write_data *wdata = data;
404
405         if (filelayout_reset_to_mds(wdata->header->lseg)) {
406                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
407                 filelayout_reset_write(wdata);
408                 rpc_exit(task, 0);
409                 return;
410         }
411         nfs41_setup_sequence(wdata->ds_clp->cl_session,
412                         &wdata->args.seq_args,
413                         &wdata->res.seq_res,
414                         task);
415 }
416
417 static void filelayout_write_call_done(struct rpc_task *task, void *data)
418 {
419         struct nfs_write_data *wdata = data;
420
421         if (test_bit(NFS_IOHDR_REDO, &wdata->header->flags) &&
422             task->tk_status == 0)
423                 return;
424
425         /* Note this may cause RPC to be resent */
426         wdata->header->mds_ops->rpc_call_done(task, data);
427 }
428
429 static void filelayout_write_count_stats(struct rpc_task *task, void *data)
430 {
431         struct nfs_write_data *wdata = data;
432
433         rpc_count_iostats(task, NFS_SERVER(wdata->header->inode)->client->cl_metrics);
434 }
435
436 static void filelayout_write_release(void *data)
437 {
438         struct nfs_write_data *wdata = data;
439         struct pnfs_layout_hdr *lo = wdata->header->lseg->pls_layout;
440
441         filelayout_fenceme(lo->plh_inode, lo);
442         nfs_put_client(wdata->ds_clp);
443         wdata->header->mds_ops->rpc_release(data);
444 }
445
446 static void filelayout_commit_prepare(struct rpc_task *task, void *data)
447 {
448         struct nfs_commit_data *wdata = data;
449
450         nfs41_setup_sequence(wdata->ds_clp->cl_session,
451                         &wdata->args.seq_args,
452                         &wdata->res.seq_res,
453                         task);
454 }
455
456 static void filelayout_write_commit_done(struct rpc_task *task, void *data)
457 {
458         struct nfs_commit_data *wdata = data;
459
460         /* Note this may cause RPC to be resent */
461         wdata->mds_ops->rpc_call_done(task, data);
462 }
463
464 static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
465 {
466         struct nfs_commit_data *cdata = data;
467
468         rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
469 }
470
471 static void filelayout_commit_release(void *calldata)
472 {
473         struct nfs_commit_data *data = calldata;
474
475         data->completion_ops->completion(data);
476         pnfs_put_lseg(data->lseg);
477         nfs_put_client(data->ds_clp);
478         nfs_commitdata_release(data);
479 }
480
481 static const struct rpc_call_ops filelayout_read_call_ops = {
482         .rpc_call_prepare = filelayout_read_prepare,
483         .rpc_call_done = filelayout_read_call_done,
484         .rpc_count_stats = filelayout_read_count_stats,
485         .rpc_release = filelayout_read_release,
486 };
487
488 static const struct rpc_call_ops filelayout_write_call_ops = {
489         .rpc_call_prepare = filelayout_write_prepare,
490         .rpc_call_done = filelayout_write_call_done,
491         .rpc_count_stats = filelayout_write_count_stats,
492         .rpc_release = filelayout_write_release,
493 };
494
495 static const struct rpc_call_ops filelayout_commit_call_ops = {
496         .rpc_call_prepare = filelayout_commit_prepare,
497         .rpc_call_done = filelayout_write_commit_done,
498         .rpc_count_stats = filelayout_commit_count_stats,
499         .rpc_release = filelayout_commit_release,
500 };
501
502 static enum pnfs_try_status
503 filelayout_read_pagelist(struct nfs_read_data *data)
504 {
505         struct nfs_pgio_header *hdr = data->header;
506         struct pnfs_layout_segment *lseg = hdr->lseg;
507         struct nfs4_pnfs_ds *ds;
508         loff_t offset = data->args.offset;
509         u32 j, idx;
510         struct nfs_fh *fh;
511
512         dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
513                 __func__, hdr->inode->i_ino,
514                 data->args.pgbase, (size_t)data->args.count, offset);
515
516         /* Retrieve the correct rpc_client for the byte range */
517         j = nfs4_fl_calc_j_index(lseg, offset);
518         idx = nfs4_fl_calc_ds_index(lseg, j);
519         ds = nfs4_fl_prepare_ds(lseg, idx);
520         if (!ds)
521                 return PNFS_NOT_ATTEMPTED;
522         dprintk("%s USE DS: %s cl_count %d\n", __func__,
523                 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
524
525         /* No multipath support. Use first DS */
526         atomic_inc(&ds->ds_clp->cl_count);
527         data->ds_clp = ds->ds_clp;
528         fh = nfs4_fl_select_ds_fh(lseg, j);
529         if (fh)
530                 data->args.fh = fh;
531
532         data->args.offset = filelayout_get_dserver_offset(lseg, offset);
533         data->mds_offset = offset;
534
535         /* Perform an asynchronous read to ds */
536         nfs_initiate_read(ds->ds_clp->cl_rpcclient, data,
537                                   &filelayout_read_call_ops, RPC_TASK_SOFTCONN);
538         return PNFS_ATTEMPTED;
539 }
540
541 /* Perform async writes. */
542 static enum pnfs_try_status
543 filelayout_write_pagelist(struct nfs_write_data *data, int sync)
544 {
545         struct nfs_pgio_header *hdr = data->header;
546         struct pnfs_layout_segment *lseg = hdr->lseg;
547         struct nfs4_pnfs_ds *ds;
548         loff_t offset = data->args.offset;
549         u32 j, idx;
550         struct nfs_fh *fh;
551
552         /* Retrieve the correct rpc_client for the byte range */
553         j = nfs4_fl_calc_j_index(lseg, offset);
554         idx = nfs4_fl_calc_ds_index(lseg, j);
555         ds = nfs4_fl_prepare_ds(lseg, idx);
556         if (!ds)
557                 return PNFS_NOT_ATTEMPTED;
558         dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
559                 __func__, hdr->inode->i_ino, sync, (size_t) data->args.count,
560                 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
561
562         data->write_done_cb = filelayout_write_done_cb;
563         atomic_inc(&ds->ds_clp->cl_count);
564         data->ds_clp = ds->ds_clp;
565         fh = nfs4_fl_select_ds_fh(lseg, j);
566         if (fh)
567                 data->args.fh = fh;
568         /*
569          * Get the file offset on the dserver. Set the write offset to
570          * this offset and save the original offset.
571          */
572         data->args.offset = filelayout_get_dserver_offset(lseg, offset);
573
574         /* Perform an asynchronous write */
575         nfs_initiate_write(ds->ds_clp->cl_rpcclient, data,
576                                     &filelayout_write_call_ops, sync,
577                                     RPC_TASK_SOFTCONN);
578         return PNFS_ATTEMPTED;
579 }
580
581 /*
582  * filelayout_check_layout()
583  *
584  * Make sure layout segment parameters are sane WRT the device.
585  * At this point no generic layer initialization of the lseg has occurred,
586  * and nothing has been added to the layout_hdr cache.
587  *
588  */
589 static int
590 filelayout_check_layout(struct pnfs_layout_hdr *lo,
591                         struct nfs4_filelayout_segment *fl,
592                         struct nfs4_layoutget_res *lgr,
593                         struct nfs4_deviceid *id,
594                         gfp_t gfp_flags)
595 {
596         struct nfs4_deviceid_node *d;
597         struct nfs4_file_layout_dsaddr *dsaddr;
598         int status = -EINVAL;
599         struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
600
601         dprintk("--> %s\n", __func__);
602
603         /* FIXME: remove this check when layout segment support is added */
604         if (lgr->range.offset != 0 ||
605             lgr->range.length != NFS4_MAX_UINT64) {
606                 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
607                         __func__);
608                 goto out;
609         }
610
611         if (fl->pattern_offset > lgr->range.offset) {
612                 dprintk("%s pattern_offset %lld too large\n",
613                                 __func__, fl->pattern_offset);
614                 goto out;
615         }
616
617         if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
618                 dprintk("%s Invalid stripe unit (%u)\n",
619                         __func__, fl->stripe_unit);
620                 goto out;
621         }
622
623         /* find and reference the deviceid */
624         d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
625                                    NFS_SERVER(lo->plh_inode)->nfs_client, id);
626         if (d == NULL) {
627                 dsaddr = filelayout_get_device_info(lo->plh_inode, id, gfp_flags);
628                 if (dsaddr == NULL)
629                         goto out;
630         } else
631                 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
632         /* Found deviceid is unavailable */
633         if (filelayout_test_devid_unavailable(&dsaddr->id_node))
634                         goto out_put;
635
636         fl->dsaddr = dsaddr;
637
638         if (fl->first_stripe_index >= dsaddr->stripe_count) {
639                 dprintk("%s Bad first_stripe_index %u\n",
640                                 __func__, fl->first_stripe_index);
641                 goto out_put;
642         }
643
644         if ((fl->stripe_type == STRIPE_SPARSE &&
645             fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
646             (fl->stripe_type == STRIPE_DENSE &&
647             fl->num_fh != dsaddr->stripe_count)) {
648                 dprintk("%s num_fh %u not valid for given packing\n",
649                         __func__, fl->num_fh);
650                 goto out_put;
651         }
652
653         if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
654                 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
655                         "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
656                         nfss->wsize);
657         }
658
659         status = 0;
660 out:
661         dprintk("--> %s returns %d\n", __func__, status);
662         return status;
663 out_put:
664         nfs4_fl_put_deviceid(dsaddr);
665         goto out;
666 }
667
668 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
669 {
670         int i;
671
672         for (i = 0; i < fl->num_fh; i++) {
673                 if (!fl->fh_array[i])
674                         break;
675                 kfree(fl->fh_array[i]);
676         }
677         kfree(fl->fh_array);
678         fl->fh_array = NULL;
679 }
680
681 static void
682 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
683 {
684         filelayout_free_fh_array(fl);
685         kfree(fl);
686 }
687
688 static int
689 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
690                          struct nfs4_filelayout_segment *fl,
691                          struct nfs4_layoutget_res *lgr,
692                          struct nfs4_deviceid *id,
693                          gfp_t gfp_flags)
694 {
695         struct xdr_stream stream;
696         struct xdr_buf buf;
697         struct page *scratch;
698         __be32 *p;
699         uint32_t nfl_util;
700         int i;
701
702         dprintk("%s: set_layout_map Begin\n", __func__);
703
704         scratch = alloc_page(gfp_flags);
705         if (!scratch)
706                 return -ENOMEM;
707
708         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
709         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
710
711         /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
712          * num_fh (4) */
713         p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
714         if (unlikely(!p))
715                 goto out_err;
716
717         memcpy(id, p, sizeof(*id));
718         p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
719         nfs4_print_deviceid(id);
720
721         nfl_util = be32_to_cpup(p++);
722         if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
723                 fl->commit_through_mds = 1;
724         if (nfl_util & NFL4_UFLG_DENSE)
725                 fl->stripe_type = STRIPE_DENSE;
726         else
727                 fl->stripe_type = STRIPE_SPARSE;
728         fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
729
730         fl->first_stripe_index = be32_to_cpup(p++);
731         p = xdr_decode_hyper(p, &fl->pattern_offset);
732         fl->num_fh = be32_to_cpup(p++);
733
734         dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
735                 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
736                 fl->pattern_offset);
737
738         /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
739          * Futher checking is done in filelayout_check_layout */
740         if (fl->num_fh >
741             max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
742                 goto out_err;
743
744         if (fl->num_fh > 0) {
745                 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
746                                        gfp_flags);
747                 if (!fl->fh_array)
748                         goto out_err;
749         }
750
751         for (i = 0; i < fl->num_fh; i++) {
752                 /* Do we want to use a mempool here? */
753                 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
754                 if (!fl->fh_array[i])
755                         goto out_err_free;
756
757                 p = xdr_inline_decode(&stream, 4);
758                 if (unlikely(!p))
759                         goto out_err_free;
760                 fl->fh_array[i]->size = be32_to_cpup(p++);
761                 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
762                         printk(KERN_ERR "NFS: Too big fh %d received %d\n",
763                                i, fl->fh_array[i]->size);
764                         goto out_err_free;
765                 }
766
767                 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
768                 if (unlikely(!p))
769                         goto out_err_free;
770                 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
771                 dprintk("DEBUG: %s: fh len %d\n", __func__,
772                         fl->fh_array[i]->size);
773         }
774
775         __free_page(scratch);
776         return 0;
777
778 out_err_free:
779         filelayout_free_fh_array(fl);
780 out_err:
781         __free_page(scratch);
782         return -EIO;
783 }
784
785 static void
786 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
787 {
788         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
789
790         dprintk("--> %s\n", __func__);
791         nfs4_fl_put_deviceid(fl->dsaddr);
792         /* This assumes a single RW lseg */
793         if (lseg->pls_range.iomode == IOMODE_RW) {
794                 struct nfs4_filelayout *flo;
795
796                 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
797                 flo->commit_info.nbuckets = 0;
798                 kfree(flo->commit_info.buckets);
799                 flo->commit_info.buckets = NULL;
800         }
801         _filelayout_free_lseg(fl);
802 }
803
804 static int
805 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
806                              struct nfs_commit_info *cinfo,
807                              gfp_t gfp_flags)
808 {
809         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
810         struct pnfs_commit_bucket *buckets;
811         int size;
812
813         if (fl->commit_through_mds)
814                 return 0;
815         if (cinfo->ds->nbuckets != 0) {
816                 /* This assumes there is only one IOMODE_RW lseg.  What
817                  * we really want to do is have a layout_hdr level
818                  * dictionary of <multipath_list4, fh> keys, each
819                  * associated with a struct list_head, populated by calls
820                  * to filelayout_write_pagelist().
821                  * */
822                 return 0;
823         }
824
825         size = (fl->stripe_type == STRIPE_SPARSE) ?
826                 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
827
828         buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
829                           gfp_flags);
830         if (!buckets)
831                 return -ENOMEM;
832         else {
833                 int i;
834
835                 spin_lock(cinfo->lock);
836                 if (cinfo->ds->nbuckets != 0)
837                         kfree(buckets);
838                 else {
839                         cinfo->ds->buckets = buckets;
840                         cinfo->ds->nbuckets = size;
841                         for (i = 0; i < size; i++) {
842                                 INIT_LIST_HEAD(&buckets[i].written);
843                                 INIT_LIST_HEAD(&buckets[i].committing);
844                         }
845                 }
846                 spin_unlock(cinfo->lock);
847                 return 0;
848         }
849 }
850
851 static struct pnfs_layout_segment *
852 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
853                       struct nfs4_layoutget_res *lgr,
854                       gfp_t gfp_flags)
855 {
856         struct nfs4_filelayout_segment *fl;
857         int rc;
858         struct nfs4_deviceid id;
859
860         dprintk("--> %s\n", __func__);
861         fl = kzalloc(sizeof(*fl), gfp_flags);
862         if (!fl)
863                 return NULL;
864
865         rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
866         if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
867                 _filelayout_free_lseg(fl);
868                 return NULL;
869         }
870         return &fl->generic_hdr;
871 }
872
873 /*
874  * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
875  *
876  * return true  : coalesce page
877  * return false : don't coalesce page
878  */
879 static bool
880 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
881                    struct nfs_page *req)
882 {
883         u64 p_stripe, r_stripe;
884         u32 stripe_unit;
885
886         if (!pnfs_generic_pg_test(pgio, prev, req) ||
887             !nfs_generic_pg_test(pgio, prev, req))
888                 return false;
889
890         p_stripe = (u64)req_offset(prev);
891         r_stripe = (u64)req_offset(req);
892         stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
893
894         do_div(p_stripe, stripe_unit);
895         do_div(r_stripe, stripe_unit);
896
897         return (p_stripe == r_stripe);
898 }
899
900 static void
901 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
902                         struct nfs_page *req)
903 {
904         WARN_ON_ONCE(pgio->pg_lseg != NULL);
905
906         if (req->wb_offset != req->wb_pgbase) {
907                 /*
908                  * Handling unaligned pages is difficult, because have to
909                  * somehow split a req in two in certain cases in the
910                  * pg.test code.  Avoid this by just not using pnfs
911                  * in this case.
912                  */
913                 nfs_pageio_reset_read_mds(pgio);
914                 return;
915         }
916         pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
917                                            req->wb_context,
918                                            0,
919                                            NFS4_MAX_UINT64,
920                                            IOMODE_READ,
921                                            GFP_KERNEL);
922         /* If no lseg, fall back to read through mds */
923         if (pgio->pg_lseg == NULL)
924                 nfs_pageio_reset_read_mds(pgio);
925 }
926
927 static void
928 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
929                          struct nfs_page *req)
930 {
931         struct nfs_commit_info cinfo;
932         int status;
933
934         WARN_ON_ONCE(pgio->pg_lseg != NULL);
935
936         if (req->wb_offset != req->wb_pgbase)
937                 goto out_mds;
938         pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
939                                            req->wb_context,
940                                            0,
941                                            NFS4_MAX_UINT64,
942                                            IOMODE_RW,
943                                            GFP_NOFS);
944         /* If no lseg, fall back to write through mds */
945         if (pgio->pg_lseg == NULL)
946                 goto out_mds;
947         nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
948         status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
949         if (status < 0) {
950                 pnfs_put_lseg(pgio->pg_lseg);
951                 pgio->pg_lseg = NULL;
952                 goto out_mds;
953         }
954         return;
955 out_mds:
956         nfs_pageio_reset_write_mds(pgio);
957 }
958
959 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
960         .pg_init = filelayout_pg_init_read,
961         .pg_test = filelayout_pg_test,
962         .pg_doio = pnfs_generic_pg_readpages,
963 };
964
965 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
966         .pg_init = filelayout_pg_init_write,
967         .pg_test = filelayout_pg_test,
968         .pg_doio = pnfs_generic_pg_writepages,
969 };
970
971 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
972 {
973         if (fl->stripe_type == STRIPE_SPARSE)
974                 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
975         else
976                 return j;
977 }
978
979 /* The generic layer is about to remove the req from the commit list.
980  * If this will make the bucket empty, it will need to put the lseg reference.
981  */
982 static void
983 filelayout_clear_request_commit(struct nfs_page *req,
984                                 struct nfs_commit_info *cinfo)
985 {
986         struct pnfs_layout_segment *freeme = NULL;
987
988         spin_lock(cinfo->lock);
989         if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
990                 goto out;
991         cinfo->ds->nwritten--;
992         if (list_is_singular(&req->wb_list)) {
993                 struct pnfs_commit_bucket *bucket;
994
995                 bucket = list_first_entry(&req->wb_list,
996                                           struct pnfs_commit_bucket,
997                                           written);
998                 freeme = bucket->wlseg;
999                 bucket->wlseg = NULL;
1000         }
1001 out:
1002         nfs_request_remove_commit_list(req, cinfo);
1003         spin_unlock(cinfo->lock);
1004         pnfs_put_lseg(freeme);
1005 }
1006
1007 static struct list_head *
1008 filelayout_choose_commit_list(struct nfs_page *req,
1009                               struct pnfs_layout_segment *lseg,
1010                               struct nfs_commit_info *cinfo)
1011 {
1012         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
1013         u32 i, j;
1014         struct list_head *list;
1015         struct pnfs_commit_bucket *buckets;
1016
1017         if (fl->commit_through_mds)
1018                 return &cinfo->mds->list;
1019
1020         /* Note that we are calling nfs4_fl_calc_j_index on each page
1021          * that ends up being committed to a data server.  An attractive
1022          * alternative is to add a field to nfs_write_data and nfs_page
1023          * to store the value calculated in filelayout_write_pagelist
1024          * and just use that here.
1025          */
1026         j = nfs4_fl_calc_j_index(lseg, req_offset(req));
1027         i = select_bucket_index(fl, j);
1028         buckets = cinfo->ds->buckets;
1029         list = &buckets[i].written;
1030         if (list_empty(list)) {
1031                 /* Non-empty buckets hold a reference on the lseg.  That ref
1032                  * is normally transferred to the COMMIT call and released
1033                  * there.  It could also be released if the last req is pulled
1034                  * off due to a rewrite, in which case it will be done in
1035                  * filelayout_clear_request_commit
1036                  */
1037                 buckets[i].wlseg = pnfs_get_lseg(lseg);
1038         }
1039         set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1040         cinfo->ds->nwritten++;
1041         return list;
1042 }
1043
1044 static void
1045 filelayout_mark_request_commit(struct nfs_page *req,
1046                                struct pnfs_layout_segment *lseg,
1047                                struct nfs_commit_info *cinfo)
1048 {
1049         struct list_head *list;
1050
1051         list = filelayout_choose_commit_list(req, lseg, cinfo);
1052         nfs_request_add_commit_list(req, list, cinfo);
1053 }
1054
1055 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1056 {
1057         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1058
1059         if (flseg->stripe_type == STRIPE_SPARSE)
1060                 return i;
1061         else
1062                 return nfs4_fl_calc_ds_index(lseg, i);
1063 }
1064
1065 static struct nfs_fh *
1066 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1067 {
1068         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1069
1070         if (flseg->stripe_type == STRIPE_SPARSE) {
1071                 if (flseg->num_fh == 1)
1072                         i = 0;
1073                 else if (flseg->num_fh == 0)
1074                         /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1075                         return NULL;
1076         }
1077         return flseg->fh_array[i];
1078 }
1079
1080 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1081 {
1082         struct pnfs_layout_segment *lseg = data->lseg;
1083         struct nfs4_pnfs_ds *ds;
1084         u32 idx;
1085         struct nfs_fh *fh;
1086
1087         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1088         ds = nfs4_fl_prepare_ds(lseg, idx);
1089         if (!ds) {
1090                 prepare_to_resend_writes(data);
1091                 filelayout_commit_release(data);
1092                 return -EAGAIN;
1093         }
1094         dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1095                 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1096         data->commit_done_cb = filelayout_commit_done_cb;
1097         atomic_inc(&ds->ds_clp->cl_count);
1098         data->ds_clp = ds->ds_clp;
1099         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1100         if (fh)
1101                 data->args.fh = fh;
1102         return nfs_initiate_commit(ds->ds_clp->cl_rpcclient, data,
1103                                    &filelayout_commit_call_ops, how,
1104                                    RPC_TASK_SOFTCONN);
1105 }
1106
1107 static int
1108 transfer_commit_list(struct list_head *src, struct list_head *dst,
1109                      struct nfs_commit_info *cinfo, int max)
1110 {
1111         struct nfs_page *req, *tmp;
1112         int ret = 0;
1113
1114         list_for_each_entry_safe(req, tmp, src, wb_list) {
1115                 if (!nfs_lock_request(req))
1116                         continue;
1117                 kref_get(&req->wb_kref);
1118                 if (cond_resched_lock(cinfo->lock))
1119                         list_safe_reset_next(req, tmp, wb_list);
1120                 nfs_request_remove_commit_list(req, cinfo);
1121                 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1122                 nfs_list_add_request(req, dst);
1123                 ret++;
1124                 if ((ret == max) && !cinfo->dreq)
1125                         break;
1126         }
1127         return ret;
1128 }
1129
1130 static int
1131 filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
1132                                struct nfs_commit_info *cinfo,
1133                                int max)
1134 {
1135         struct list_head *src = &bucket->written;
1136         struct list_head *dst = &bucket->committing;
1137         int ret;
1138
1139         ret = transfer_commit_list(src, dst, cinfo, max);
1140         if (ret) {
1141                 cinfo->ds->nwritten -= ret;
1142                 cinfo->ds->ncommitting += ret;
1143                 bucket->clseg = bucket->wlseg;
1144                 if (list_empty(src))
1145                         bucket->wlseg = NULL;
1146                 else
1147                         pnfs_get_lseg(bucket->clseg);
1148         }
1149         return ret;
1150 }
1151
1152 /* Move reqs from written to committing lists, returning count of number moved.
1153  * Note called with cinfo->lock held.
1154  */
1155 static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo,
1156                                         int max)
1157 {
1158         int i, rv = 0, cnt;
1159
1160         for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
1161                 cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i],
1162                                                      cinfo, max);
1163                 max -= cnt;
1164                 rv += cnt;
1165         }
1166         return rv;
1167 }
1168
1169 /* Pull everything off the committing lists and dump into @dst */
1170 static void filelayout_recover_commit_reqs(struct list_head *dst,
1171                                            struct nfs_commit_info *cinfo)
1172 {
1173         struct pnfs_commit_bucket *b;
1174         int i;
1175
1176         /* NOTE cinfo->lock is NOT held, relying on fact that this is
1177          * only called on single thread per dreq.
1178          * Can't take the lock because need to do pnfs_put_lseg
1179          */
1180         for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1181                 if (transfer_commit_list(&b->written, dst, cinfo, 0)) {
1182                         pnfs_put_lseg(b->wlseg);
1183                         b->wlseg = NULL;
1184                 }
1185         }
1186         cinfo->ds->nwritten = 0;
1187 }
1188
1189 static unsigned int
1190 alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list)
1191 {
1192         struct pnfs_ds_commit_info *fl_cinfo;
1193         struct pnfs_commit_bucket *bucket;
1194         struct nfs_commit_data *data;
1195         int i, j;
1196         unsigned int nreq = 0;
1197
1198         fl_cinfo = cinfo->ds;
1199         bucket = fl_cinfo->buckets;
1200         for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
1201                 if (list_empty(&bucket->committing))
1202                         continue;
1203                 data = nfs_commitdata_alloc();
1204                 if (!data)
1205                         break;
1206                 data->ds_commit_index = i;
1207                 data->lseg = bucket->clseg;
1208                 bucket->clseg = NULL;
1209                 list_add(&data->pages, list);
1210                 nreq++;
1211         }
1212
1213         /* Clean up on error */
1214         for (j = i; j < fl_cinfo->nbuckets; j++, bucket++) {
1215                 if (list_empty(&bucket->committing))
1216                         continue;
1217                 nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo);
1218                 pnfs_put_lseg(bucket->clseg);
1219                 bucket->clseg = NULL;
1220         }
1221         /* Caller will clean up entries put on list */
1222         return nreq;
1223 }
1224
1225 /* This follows nfs_commit_list pretty closely */
1226 static int
1227 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1228                            int how, struct nfs_commit_info *cinfo)
1229 {
1230         struct nfs_commit_data *data, *tmp;
1231         LIST_HEAD(list);
1232         unsigned int nreq = 0;
1233
1234         if (!list_empty(mds_pages)) {
1235                 data = nfs_commitdata_alloc();
1236                 if (data != NULL) {
1237                         data->lseg = NULL;
1238                         list_add(&data->pages, &list);
1239                         nreq++;
1240                 } else
1241                         nfs_retry_commit(mds_pages, NULL, cinfo);
1242         }
1243
1244         nreq += alloc_ds_commits(cinfo, &list);
1245
1246         if (nreq == 0) {
1247                 cinfo->completion_ops->error_cleanup(NFS_I(inode));
1248                 goto out;
1249         }
1250
1251         atomic_add(nreq, &cinfo->mds->rpcs_out);
1252
1253         list_for_each_entry_safe(data, tmp, &list, pages) {
1254                 list_del_init(&data->pages);
1255                 if (!data->lseg) {
1256                         nfs_init_commit(data, mds_pages, NULL, cinfo);
1257                         nfs_initiate_commit(NFS_CLIENT(inode), data,
1258                                             data->mds_ops, how, 0);
1259                 } else {
1260                         struct pnfs_commit_bucket *buckets;
1261
1262                         buckets = cinfo->ds->buckets;
1263                         nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo);
1264                         filelayout_initiate_commit(data, how);
1265                 }
1266         }
1267 out:
1268         cinfo->ds->ncommitting = 0;
1269         return PNFS_ATTEMPTED;
1270 }
1271
1272 static void
1273 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1274 {
1275         nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1276 }
1277
1278 static struct pnfs_layout_hdr *
1279 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1280 {
1281         struct nfs4_filelayout *flo;
1282
1283         flo = kzalloc(sizeof(*flo), gfp_flags);
1284         return &flo->generic_hdr;
1285 }
1286
1287 static void
1288 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1289 {
1290         kfree(FILELAYOUT_FROM_HDR(lo));
1291 }
1292
1293 static struct pnfs_ds_commit_info *
1294 filelayout_get_ds_info(struct inode *inode)
1295 {
1296         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1297
1298         if (layout == NULL)
1299                 return NULL;
1300         else
1301                 return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1302 }
1303
1304 static struct pnfs_layoutdriver_type filelayout_type = {
1305         .id                     = LAYOUT_NFSV4_1_FILES,
1306         .name                   = "LAYOUT_NFSV4_1_FILES",
1307         .owner                  = THIS_MODULE,
1308         .alloc_layout_hdr       = filelayout_alloc_layout_hdr,
1309         .free_layout_hdr        = filelayout_free_layout_hdr,
1310         .alloc_lseg             = filelayout_alloc_lseg,
1311         .free_lseg              = filelayout_free_lseg,
1312         .pg_read_ops            = &filelayout_pg_read_ops,
1313         .pg_write_ops           = &filelayout_pg_write_ops,
1314         .get_ds_info            = &filelayout_get_ds_info,
1315         .mark_request_commit    = filelayout_mark_request_commit,
1316         .clear_request_commit   = filelayout_clear_request_commit,
1317         .scan_commit_lists      = filelayout_scan_commit_lists,
1318         .recover_commit_reqs    = filelayout_recover_commit_reqs,
1319         .commit_pagelist        = filelayout_commit_pagelist,
1320         .read_pagelist          = filelayout_read_pagelist,
1321         .write_pagelist         = filelayout_write_pagelist,
1322         .free_deviceid_node     = filelayout_free_deveiceid_node,
1323 };
1324
1325 static int __init nfs4filelayout_init(void)
1326 {
1327         printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1328                __func__);
1329         return pnfs_register_layoutdriver(&filelayout_type);
1330 }
1331
1332 static void __exit nfs4filelayout_exit(void)
1333 {
1334         printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1335                __func__);
1336         pnfs_unregister_layoutdriver(&filelayout_type);
1337 }
1338
1339 MODULE_ALIAS("nfs-layouttype4-1");
1340
1341 module_init(nfs4filelayout_init);
1342 module_exit(nfs4filelayout_exit);