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