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