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TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs4filelayout.c

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Module for the pnfs nfs4 file layout driver.
  3  *  Defines all I/O and Policy interface operations, plus code
  4  *  to register itself with the pNFS client.
  5  *
  6  *  Copyright (c) 2002
  7  *  The Regents of the University of Michigan
  8  *  All Rights Reserved
  9  *
 10  *  Dean Hildebrand <dhildebz@umich.edu>
 11  *
 12  *  Permission is granted to use, copy, create derivative works, and
 13  *  redistribute this software and such derivative works for any purpose,
 14  *  so long as the name of the University of Michigan is not used in
 15  *  any advertising or publicity pertaining to the use or distribution
 16  *  of this software without specific, written prior authorization. If
 17  *  the above copyright notice or any other identification of the
 18  *  University of Michigan is included in any copy of any portion of
 19  *  this software, then the disclaimer below must also be included.
 20  *
 21  *  This software is provided as is, without representation or warranty
 22  *  of any kind either express or implied, including without limitation
 23  *  the implied warranties of merchantability, fitness for a particular
 24  *  purpose, or noninfringement.  The Regents of the University of
 25  *  Michigan shall not be liable for any damages, including special,
 26  *  indirect, incidental, or consequential damages, with respect to any
 27  *  claim arising out of or in connection with the use of the software,
 28  *  even if it has been or is hereafter advised of the possibility of
 29  *  such damages.
 30  */
 31 
 32 #include <linux/nfs_fs.h>
 33 #include <linux/nfs_page.h>
 34 #include <linux/module.h>
 35 
 36 #include <linux/sunrpc/metrics.h>
 37 
 38 #include "nfs4session.h"
 39 #include "internal.h"
 40 #include "delegation.h"
 41 #include "nfs4filelayout.h"
 42 #include "nfs4trace.h"
 43 
 44 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
 45 
 46 MODULE_LICENSE("GPL");
 47 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
 48 MODULE_DESCRIPTION("The NFSv4 file layout driver");
 49 
 50 #define FILELAYOUT_POLL_RETRY_MAX     (15*HZ)
 51 
 52 static loff_t
 53 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
 54                             loff_t offset)
 55 {
 56         u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
 57         u64 stripe_no;
 58         u32 rem;
 59 
 60         offset -= flseg->pattern_offset;
 61         stripe_no = div_u64(offset, stripe_width);
 62         div_u64_rem(offset, flseg->stripe_unit, &rem);
 63 
 64         return stripe_no * flseg->stripe_unit + rem;
 65 }
 66 
 67 /* This function is used by the layout driver to calculate the
 68  * offset of the file on the dserver based on whether the
 69  * layout type is STRIPE_DENSE or STRIPE_SPARSE
 70  */
 71 static loff_t
 72 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
 73 {
 74         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
 75 
 76         switch (flseg->stripe_type) {
 77         case STRIPE_SPARSE:
 78                 return offset;
 79 
 80         case STRIPE_DENSE:
 81                 return filelayout_get_dense_offset(flseg, offset);
 82         }
 83 
 84         BUG();
 85 }
 86 
 87 static void filelayout_reset_write(struct nfs_write_data *data)
 88 {
 89         struct nfs_pgio_header *hdr = data->header;
 90         struct rpc_task *task = &data->task;
 91 
 92         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
 93                 dprintk("%s Reset task %5u for i/o through MDS "
 94                         "(req %s/%lld, %u bytes @ offset %llu)\n", __func__,
 95                         data->task.tk_pid,
 96                         hdr->inode->i_sb->s_id,
 97                         (long long)NFS_FILEID(hdr->inode),
 98                         data->args.count,
 99                         (unsigned long long)data->args.offset);
100 
101                 task->tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
102                                                         &hdr->pages,
103                                                         hdr->completion_ops,
104                                                         hdr->dreq);
105         }
106 }
107 
108 static void filelayout_reset_read(struct nfs_read_data *data)
109 {
110         struct nfs_pgio_header *hdr = data->header;
111         struct rpc_task *task = &data->task;
112 
113         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
114                 dprintk("%s Reset task %5u for i/o through MDS "
115                         "(req %s/%lld, %u bytes @ offset %llu)\n", __func__,
116                         data->task.tk_pid,
117                         hdr->inode->i_sb->s_id,
118                         (long long)NFS_FILEID(hdr->inode),
119                         data->args.count,
120                         (unsigned long long)data->args.offset);
121 
122                 task->tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
123                                                         &hdr->pages,
124                                                         hdr->completion_ops,
125                                                         hdr->dreq);
126         }
127 }
128 
129 static void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo)
130 {
131         if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
132                 return;
133         pnfs_return_layout(inode);
134 }
135 
136 static int filelayout_async_handle_error(struct rpc_task *task,
137                                          struct nfs4_state *state,
138                                          struct nfs_client *clp,
139                                          struct pnfs_layout_segment *lseg)
140 {
141         struct pnfs_layout_hdr *lo = lseg->pls_layout;
142         struct inode *inode = lo->plh_inode;
143         struct nfs_server *mds_server = NFS_SERVER(inode);
144         struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
145         struct nfs_client *mds_client = mds_server->nfs_client;
146         struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
147 
148         if (task->tk_status >= 0)
149                 return 0;
150 
151         switch (task->tk_status) {
152         /* MDS state errors */
153         case -NFS4ERR_DELEG_REVOKED:
154         case -NFS4ERR_ADMIN_REVOKED:
155         case -NFS4ERR_BAD_STATEID:
156                 if (state == NULL)
157                         break;
158                 nfs_remove_bad_delegation(state->inode);
159         case -NFS4ERR_OPENMODE:
160                 if (state == NULL)
161                         break;
162                 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
163                         goto out_bad_stateid;
164                 goto wait_on_recovery;
165         case -NFS4ERR_EXPIRED:
166                 if (state != NULL) {
167                         if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
168                                 goto out_bad_stateid;
169                 }
170                 nfs4_schedule_lease_recovery(mds_client);
171                 goto wait_on_recovery;
172         /* DS session errors */
173         case -NFS4ERR_BADSESSION:
174         case -NFS4ERR_BADSLOT:
175         case -NFS4ERR_BAD_HIGH_SLOT:
176         case -NFS4ERR_DEADSESSION:
177         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
178         case -NFS4ERR_SEQ_FALSE_RETRY:
179         case -NFS4ERR_SEQ_MISORDERED:
180                 dprintk("%s ERROR %d, Reset session. Exchangeid "
181                         "flags 0x%x\n", __func__, task->tk_status,
182                         clp->cl_exchange_flags);
183                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
184                 break;
185         case -NFS4ERR_DELAY:
186         case -NFS4ERR_GRACE:
187                 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
188                 break;
189         case -NFS4ERR_RETRY_UNCACHED_REP:
190                 break;
191         /* Invalidate Layout errors */
192         case -NFS4ERR_PNFS_NO_LAYOUT:
193         case -ESTALE:           /* mapped NFS4ERR_STALE */
194         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
195         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
196         case -NFS4ERR_FHEXPIRED:
197         case -NFS4ERR_WRONG_TYPE:
198                 dprintk("%s Invalid layout error %d\n", __func__,
199                         task->tk_status);
200                 /*
201                  * Destroy layout so new i/o will get a new layout.
202                  * Layout will not be destroyed until all current lseg
203                  * references are put. Mark layout as invalid to resend failed
204                  * i/o and all i/o waiting on the slot table to the MDS until
205                  * layout is destroyed and a new valid layout is obtained.
206                  */
207                 pnfs_destroy_layout(NFS_I(inode));
208                 rpc_wake_up(&tbl->slot_tbl_waitq);
209                 goto reset;
210         /* RPC connection errors */
211         case -ECONNREFUSED:
212         case -EHOSTDOWN:
213         case -EHOSTUNREACH:
214         case -ENETUNREACH:
215         case -EIO:
216         case -ETIMEDOUT:
217         case -EPIPE:
218                 dprintk("%s DS connection error %d\n", __func__,
219                         task->tk_status);
220                 nfs4_mark_deviceid_unavailable(devid);
221                 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
222                 rpc_wake_up(&tbl->slot_tbl_waitq);
223                 /* fall through */
224         default:
225 reset:
226                 dprintk("%s Retry through MDS. Error %d\n", __func__,
227                         task->tk_status);
228                 return -NFS4ERR_RESET_TO_MDS;
229         }
230 out:
231         task->tk_status = 0;
232         return -EAGAIN;
233 out_bad_stateid:
234         task->tk_status = -EIO;
235         return 0;
236 wait_on_recovery:
237         rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
238         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
239                 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
240         goto out;
241 }
242 
243 /* NFS_PROTO call done callback routines */
244 
245 static int filelayout_read_done_cb(struct rpc_task *task,
246                                 struct nfs_read_data *data)
247 {
248         struct nfs_pgio_header *hdr = data->header;
249         int err;
250 
251         trace_nfs4_pnfs_read(data, task->tk_status);
252         err = filelayout_async_handle_error(task, data->args.context->state,
253                                             data->ds_clp, hdr->lseg);
254 
255         switch (err) {
256         case -NFS4ERR_RESET_TO_MDS:
257                 filelayout_reset_read(data);
258                 return task->tk_status;
259         case -EAGAIN:
260                 rpc_restart_call_prepare(task);
261                 return -EAGAIN;
262         }
263 
264         return 0;
265 }
266 
267 /*
268  * We reference the rpc_cred of the first WRITE that triggers the need for
269  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
270  * rfc5661 is not clear about which credential should be used.
271  */
272 static void
273 filelayout_set_layoutcommit(struct nfs_write_data *wdata)
274 {
275         struct nfs_pgio_header *hdr = wdata->header;
276 
277         if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
278             wdata->res.verf->committed == NFS_FILE_SYNC)
279                 return;
280 
281         pnfs_set_layoutcommit(wdata);
282         dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
283                 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
284 }
285 
286 bool
287 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
288 {
289         return filelayout_test_devid_invalid(node) ||
290                 nfs4_test_deviceid_unavailable(node);
291 }
292 
293 static bool
294 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
295 {
296         struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
297 
298         return filelayout_test_devid_unavailable(node);
299 }
300 
301 /*
302  * Call ops for the async read/write cases
303  * In the case of dense layouts, the offset needs to be reset to its
304  * original value.
305  */
306 static void filelayout_read_prepare(struct rpc_task *task, void *data)
307 {
308         struct nfs_read_data *rdata = data;
309 
310         if (unlikely(test_bit(NFS_CONTEXT_BAD, &rdata->args.context->flags))) {
311                 rpc_exit(task, -EIO);
312                 return;
313         }
314         if (filelayout_reset_to_mds(rdata->header->lseg)) {
315                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
316                 filelayout_reset_read(rdata);
317                 rpc_exit(task, 0);
318                 return;
319         }
320         rdata->read_done_cb = filelayout_read_done_cb;
321 
322         if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
323                         &rdata->args.seq_args,
324                         &rdata->res.seq_res,
325                         task))
326                 return;
327         nfs4_set_rw_stateid(&rdata->args.stateid, rdata->args.context,
328                         rdata->args.lock_context, FMODE_READ);
329 }
330 
331 static void filelayout_read_call_done(struct rpc_task *task, void *data)
332 {
333         struct nfs_read_data *rdata = data;
334 
335         dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
336 
337         if (test_bit(NFS_IOHDR_REDO, &rdata->header->flags) &&
338             task->tk_status == 0) {
339                 if (rdata->res.seq_res.sr_slot != NULL)
340                         nfs41_sequence_done(task, &rdata->res.seq_res);
341                 return;
342         }
343 
344         /* Note this may cause RPC to be resent */
345         rdata->header->mds_ops->rpc_call_done(task, data);
346 }
347 
348 static void filelayout_read_count_stats(struct rpc_task *task, void *data)
349 {
350         struct nfs_read_data *rdata = data;
351 
352         rpc_count_iostats(task, NFS_SERVER(rdata->header->inode)->client->cl_metrics);
353 }
354 
355 static void filelayout_read_release(void *data)
356 {
357         struct nfs_read_data *rdata = data;
358         struct pnfs_layout_hdr *lo = rdata->header->lseg->pls_layout;
359 
360         filelayout_fenceme(lo->plh_inode, lo);
361         nfs_put_client(rdata->ds_clp);
362         rdata->header->mds_ops->rpc_release(data);
363 }
364 
365 static int filelayout_write_done_cb(struct rpc_task *task,
366                                 struct nfs_write_data *data)
367 {
368         struct nfs_pgio_header *hdr = data->header;
369         int err;
370 
371         trace_nfs4_pnfs_write(data, task->tk_status);
372         err = filelayout_async_handle_error(task, data->args.context->state,
373                                             data->ds_clp, hdr->lseg);
374 
375         switch (err) {
376         case -NFS4ERR_RESET_TO_MDS:
377                 filelayout_reset_write(data);
378                 return task->tk_status;
379         case -EAGAIN:
380                 rpc_restart_call_prepare(task);
381                 return -EAGAIN;
382         }
383 
384         filelayout_set_layoutcommit(data);
385         return 0;
386 }
387 
388 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
389 static void prepare_to_resend_writes(struct nfs_commit_data *data)
390 {
391         struct nfs_page *first = nfs_list_entry(data->pages.next);
392 
393         data->task.tk_status = 0;
394         memcpy(&data->verf.verifier, &first->wb_verf,
395                sizeof(data->verf.verifier));
396         data->verf.verifier.data[0]++; /* ensure verifier mismatch */
397 }
398 
399 static int filelayout_commit_done_cb(struct rpc_task *task,
400                                      struct nfs_commit_data *data)
401 {
402         int err;
403 
404         trace_nfs4_pnfs_commit_ds(data, task->tk_status);
405         err = filelayout_async_handle_error(task, NULL, data->ds_clp,
406                                             data->lseg);
407 
408         switch (err) {
409         case -NFS4ERR_RESET_TO_MDS:
410                 prepare_to_resend_writes(data);
411                 return -EAGAIN;
412         case -EAGAIN:
413                 rpc_restart_call_prepare(task);
414                 return -EAGAIN;
415         }
416 
417         return 0;
418 }
419 
420 static void filelayout_write_prepare(struct rpc_task *task, void *data)
421 {
422         struct nfs_write_data *wdata = data;
423 
424         if (unlikely(test_bit(NFS_CONTEXT_BAD, &wdata->args.context->flags))) {
425                 rpc_exit(task, -EIO);
426                 return;
427         }
428         if (filelayout_reset_to_mds(wdata->header->lseg)) {
429                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
430                 filelayout_reset_write(wdata);
431                 rpc_exit(task, 0);
432                 return;
433         }
434         if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
435                         &wdata->args.seq_args,
436                         &wdata->res.seq_res,
437                         task))
438                 return;
439         nfs4_set_rw_stateid(&wdata->args.stateid, wdata->args.context,
440                         wdata->args.lock_context, FMODE_WRITE);
441 }
442 
443 static void filelayout_write_call_done(struct rpc_task *task, void *data)
444 {
445         struct nfs_write_data *wdata = data;
446 
447         if (test_bit(NFS_IOHDR_REDO, &wdata->header->flags) &&
448             task->tk_status == 0) {
449                 if (wdata->res.seq_res.sr_slot != NULL)
450                         nfs41_sequence_done(task, &wdata->res.seq_res);
451                 return;
452         }
453 
454         /* Note this may cause RPC to be resent */
455         wdata->header->mds_ops->rpc_call_done(task, data);
456 }
457 
458 static void filelayout_write_count_stats(struct rpc_task *task, void *data)
459 {
460         struct nfs_write_data *wdata = data;
461 
462         rpc_count_iostats(task, NFS_SERVER(wdata->header->inode)->client->cl_metrics);
463 }
464 
465 static void filelayout_write_release(void *data)
466 {
467         struct nfs_write_data *wdata = data;
468         struct pnfs_layout_hdr *lo = wdata->header->lseg->pls_layout;
469 
470         filelayout_fenceme(lo->plh_inode, lo);
471         nfs_put_client(wdata->ds_clp);
472         wdata->header->mds_ops->rpc_release(data);
473 }
474 
475 static void filelayout_commit_prepare(struct rpc_task *task, void *data)
476 {
477         struct nfs_commit_data *wdata = data;
478 
479         nfs41_setup_sequence(wdata->ds_clp->cl_session,
480                         &wdata->args.seq_args,
481                         &wdata->res.seq_res,
482                         task);
483 }
484 
485 static void filelayout_write_commit_done(struct rpc_task *task, void *data)
486 {
487         struct nfs_commit_data *wdata = data;
488 
489         /* Note this may cause RPC to be resent */
490         wdata->mds_ops->rpc_call_done(task, data);
491 }
492 
493 static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
494 {
495         struct nfs_commit_data *cdata = data;
496 
497         rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
498 }
499 
500 static void filelayout_commit_release(void *calldata)
501 {
502         struct nfs_commit_data *data = calldata;
503 
504         data->completion_ops->completion(data);
505         pnfs_put_lseg(data->lseg);
506         nfs_put_client(data->ds_clp);
507         nfs_commitdata_release(data);
508 }
509 
510 static const struct rpc_call_ops filelayout_read_call_ops = {
511         .rpc_call_prepare = filelayout_read_prepare,
512         .rpc_call_done = filelayout_read_call_done,
513         .rpc_count_stats = filelayout_read_count_stats,
514         .rpc_release = filelayout_read_release,
515 };
516 
517 static const struct rpc_call_ops filelayout_write_call_ops = {
518         .rpc_call_prepare = filelayout_write_prepare,
519         .rpc_call_done = filelayout_write_call_done,
520         .rpc_count_stats = filelayout_write_count_stats,
521         .rpc_release = filelayout_write_release,
522 };
523 
524 static const struct rpc_call_ops filelayout_commit_call_ops = {
525         .rpc_call_prepare = filelayout_commit_prepare,
526         .rpc_call_done = filelayout_write_commit_done,
527         .rpc_count_stats = filelayout_commit_count_stats,
528         .rpc_release = filelayout_commit_release,
529 };
530 
531 static enum pnfs_try_status
532 filelayout_read_pagelist(struct nfs_read_data *data)
533 {
534         struct nfs_pgio_header *hdr = data->header;
535         struct pnfs_layout_segment *lseg = hdr->lseg;
536         struct nfs4_pnfs_ds *ds;
537         struct rpc_clnt *ds_clnt;
538         loff_t offset = data->args.offset;
539         u32 j, idx;
540         struct nfs_fh *fh;
541 
542         dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
543                 __func__, hdr->inode->i_ino,
544                 data->args.pgbase, (size_t)data->args.count, offset);
545 
546         /* Retrieve the correct rpc_client for the byte range */
547         j = nfs4_fl_calc_j_index(lseg, offset);
548         idx = nfs4_fl_calc_ds_index(lseg, j);
549         ds = nfs4_fl_prepare_ds(lseg, idx);
550         if (!ds)
551                 return PNFS_NOT_ATTEMPTED;
552 
553         ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
554         if (IS_ERR(ds_clnt))
555                 return PNFS_NOT_ATTEMPTED;
556 
557         dprintk("%s USE DS: %s cl_count %d\n", __func__,
558                 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
559 
560         /* No multipath support. Use first DS */
561         atomic_inc(&ds->ds_clp->cl_count);
562         data->ds_clp = ds->ds_clp;
563         fh = nfs4_fl_select_ds_fh(lseg, j);
564         if (fh)
565                 data->args.fh = fh;
566 
567         data->args.offset = filelayout_get_dserver_offset(lseg, offset);
568         data->mds_offset = offset;
569 
570         /* Perform an asynchronous read to ds */
571         nfs_initiate_read(ds_clnt, data,
572                                   &filelayout_read_call_ops, RPC_TASK_SOFTCONN);
573         return PNFS_ATTEMPTED;
574 }
575 
576 /* Perform async writes. */
577 static enum pnfs_try_status
578 filelayout_write_pagelist(struct nfs_write_data *data, int sync)
579 {
580         struct nfs_pgio_header *hdr = data->header;
581         struct pnfs_layout_segment *lseg = hdr->lseg;
582         struct nfs4_pnfs_ds *ds;
583         struct rpc_clnt *ds_clnt;
584         loff_t offset = data->args.offset;
585         u32 j, idx;
586         struct nfs_fh *fh;
587 
588         /* Retrieve the correct rpc_client for the byte range */
589         j = nfs4_fl_calc_j_index(lseg, offset);
590         idx = nfs4_fl_calc_ds_index(lseg, j);
591         ds = nfs4_fl_prepare_ds(lseg, idx);
592         if (!ds)
593                 return PNFS_NOT_ATTEMPTED;
594 
595         ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
596         if (IS_ERR(ds_clnt))
597                 return PNFS_NOT_ATTEMPTED;
598 
599         dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
600                 __func__, hdr->inode->i_ino, sync, (size_t) data->args.count,
601                 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
602 
603         data->write_done_cb = filelayout_write_done_cb;
604         atomic_inc(&ds->ds_clp->cl_count);
605         data->ds_clp = ds->ds_clp;
606         fh = nfs4_fl_select_ds_fh(lseg, j);
607         if (fh)
608                 data->args.fh = fh;
609         /*
610          * Get the file offset on the dserver. Set the write offset to
611          * this offset and save the original offset.
612          */
613         data->args.offset = filelayout_get_dserver_offset(lseg, offset);
614 
615         /* Perform an asynchronous write */
616         nfs_initiate_write(ds_clnt, data,
617                                     &filelayout_write_call_ops, sync,
618                                     RPC_TASK_SOFTCONN);
619         return PNFS_ATTEMPTED;
620 }
621 
622 /*
623  * filelayout_check_layout()
624  *
625  * Make sure layout segment parameters are sane WRT the device.
626  * At this point no generic layer initialization of the lseg has occurred,
627  * and nothing has been added to the layout_hdr cache.
628  *
629  */
630 static int
631 filelayout_check_layout(struct pnfs_layout_hdr *lo,
632                         struct nfs4_filelayout_segment *fl,
633                         struct nfs4_layoutget_res *lgr,
634                         struct nfs4_deviceid *id,
635                         gfp_t gfp_flags)
636 {
637         struct nfs4_deviceid_node *d;
638         struct nfs4_file_layout_dsaddr *dsaddr;
639         int status = -EINVAL;
640         struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
641 
642         dprintk("--> %s\n", __func__);
643 
644         /* FIXME: remove this check when layout segment support is added */
645         if (lgr->range.offset != 0 ||
646             lgr->range.length != NFS4_MAX_UINT64) {
647                 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
648                         __func__);
649                 goto out;
650         }
651 
652         if (fl->pattern_offset > lgr->range.offset) {
653                 dprintk("%s pattern_offset %lld too large\n",
654                                 __func__, fl->pattern_offset);
655                 goto out;
656         }
657 
658         if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
659                 dprintk("%s Invalid stripe unit (%u)\n",
660                         __func__, fl->stripe_unit);
661                 goto out;
662         }
663 
664         /* find and reference the deviceid */
665         d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
666                                    NFS_SERVER(lo->plh_inode)->nfs_client, id);
667         if (d == NULL) {
668                 dsaddr = filelayout_get_device_info(lo->plh_inode, id,
669                                 lo->plh_lc_cred, gfp_flags);
670                 if (dsaddr == NULL)
671                         goto out;
672         } else
673                 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
674         /* Found deviceid is unavailable */
675         if (filelayout_test_devid_unavailable(&dsaddr->id_node))
676                         goto out_put;
677 
678         fl->dsaddr = dsaddr;
679 
680         if (fl->first_stripe_index >= dsaddr->stripe_count) {
681                 dprintk("%s Bad first_stripe_index %u\n",
682                                 __func__, fl->first_stripe_index);
683                 goto out_put;
684         }
685 
686         if ((fl->stripe_type == STRIPE_SPARSE &&
687             fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
688             (fl->stripe_type == STRIPE_DENSE &&
689             fl->num_fh != dsaddr->stripe_count)) {
690                 dprintk("%s num_fh %u not valid for given packing\n",
691                         __func__, fl->num_fh);
692                 goto out_put;
693         }
694 
695         if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
696                 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
697                         "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
698                         nfss->wsize);
699         }
700 
701         status = 0;
702 out:
703         dprintk("--> %s returns %d\n", __func__, status);
704         return status;
705 out_put:
706         nfs4_fl_put_deviceid(dsaddr);
707         goto out;
708 }
709 
710 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
711 {
712         int i;
713 
714         for (i = 0; i < fl->num_fh; i++) {
715                 if (!fl->fh_array[i])
716                         break;
717                 kfree(fl->fh_array[i]);
718         }
719         kfree(fl->fh_array);
720         fl->fh_array = NULL;
721 }
722 
723 static void
724 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
725 {
726         filelayout_free_fh_array(fl);
727         kfree(fl);
728 }
729 
730 static int
731 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
732                          struct nfs4_filelayout_segment *fl,
733                          struct nfs4_layoutget_res *lgr,
734                          struct nfs4_deviceid *id,
735                          gfp_t gfp_flags)
736 {
737         struct xdr_stream stream;
738         struct xdr_buf buf;
739         struct page *scratch;
740         __be32 *p;
741         uint32_t nfl_util;
742         int i;
743 
744         dprintk("%s: set_layout_map Begin\n", __func__);
745 
746         scratch = alloc_page(gfp_flags);
747         if (!scratch)
748                 return -ENOMEM;
749 
750         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
751         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
752 
753         /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
754          * num_fh (4) */
755         p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
756         if (unlikely(!p))
757                 goto out_err;
758 
759         memcpy(id, p, sizeof(*id));
760         p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
761         nfs4_print_deviceid(id);
762 
763         nfl_util = be32_to_cpup(p++);
764         if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
765                 fl->commit_through_mds = 1;
766         if (nfl_util & NFL4_UFLG_DENSE)
767                 fl->stripe_type = STRIPE_DENSE;
768         else
769                 fl->stripe_type = STRIPE_SPARSE;
770         fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
771 
772         fl->first_stripe_index = be32_to_cpup(p++);
773         p = xdr_decode_hyper(p, &fl->pattern_offset);
774         fl->num_fh = be32_to_cpup(p++);
775 
776         dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
777                 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
778                 fl->pattern_offset);
779 
780         /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
781          * Futher checking is done in filelayout_check_layout */
782         if (fl->num_fh >
783             max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
784                 goto out_err;
785 
786         if (fl->num_fh > 0) {
787                 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
788                                        gfp_flags);
789                 if (!fl->fh_array)
790                         goto out_err;
791         }
792 
793         for (i = 0; i < fl->num_fh; i++) {
794                 /* Do we want to use a mempool here? */
795                 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
796                 if (!fl->fh_array[i])
797                         goto out_err_free;
798 
799                 p = xdr_inline_decode(&stream, 4);
800                 if (unlikely(!p))
801                         goto out_err_free;
802                 fl->fh_array[i]->size = be32_to_cpup(p++);
803                 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
804                         printk(KERN_ERR "NFS: Too big fh %d received %d\n",
805                                i, fl->fh_array[i]->size);
806                         goto out_err_free;
807                 }
808 
809                 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
810                 if (unlikely(!p))
811                         goto out_err_free;
812                 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
813                 dprintk("DEBUG: %s: fh len %d\n", __func__,
814                         fl->fh_array[i]->size);
815         }
816 
817         __free_page(scratch);
818         return 0;
819 
820 out_err_free:
821         filelayout_free_fh_array(fl);
822 out_err:
823         __free_page(scratch);
824         return -EIO;
825 }
826 
827 static void
828 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
829 {
830         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
831 
832         dprintk("--> %s\n", __func__);
833         nfs4_fl_put_deviceid(fl->dsaddr);
834         /* This assumes a single RW lseg */
835         if (lseg->pls_range.iomode == IOMODE_RW) {
836                 struct nfs4_filelayout *flo;
837 
838                 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
839                 flo->commit_info.nbuckets = 0;
840                 kfree(flo->commit_info.buckets);
841                 flo->commit_info.buckets = NULL;
842         }
843         _filelayout_free_lseg(fl);
844 }
845 
846 static int
847 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
848                              struct nfs_commit_info *cinfo,
849                              gfp_t gfp_flags)
850 {
851         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
852         struct pnfs_commit_bucket *buckets;
853         int size;
854 
855         if (fl->commit_through_mds)
856                 return 0;
857         if (cinfo->ds->nbuckets != 0) {
858                 /* This assumes there is only one IOMODE_RW lseg.  What
859                  * we really want to do is have a layout_hdr level
860                  * dictionary of <multipath_list4, fh> keys, each
861                  * associated with a struct list_head, populated by calls
862                  * to filelayout_write_pagelist().
863                  * */
864                 return 0;
865         }
866 
867         size = (fl->stripe_type == STRIPE_SPARSE) ?
868                 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
869 
870         buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
871                           gfp_flags);
872         if (!buckets)
873                 return -ENOMEM;
874         else {
875                 int i;
876 
877                 spin_lock(cinfo->lock);
878                 if (cinfo->ds->nbuckets != 0)
879                         kfree(buckets);
880                 else {
881                         cinfo->ds->buckets = buckets;
882                         cinfo->ds->nbuckets = size;
883                         for (i = 0; i < size; i++) {
884                                 INIT_LIST_HEAD(&buckets[i].written);
885                                 INIT_LIST_HEAD(&buckets[i].committing);
886                         }
887                 }
888                 spin_unlock(cinfo->lock);
889                 return 0;
890         }
891 }
892 
893 static struct pnfs_layout_segment *
894 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
895                       struct nfs4_layoutget_res *lgr,
896                       gfp_t gfp_flags)
897 {
898         struct nfs4_filelayout_segment *fl;
899         int rc;
900         struct nfs4_deviceid id;
901 
902         dprintk("--> %s\n", __func__);
903         fl = kzalloc(sizeof(*fl), gfp_flags);
904         if (!fl)
905                 return NULL;
906 
907         rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
908         if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
909                 _filelayout_free_lseg(fl);
910                 return NULL;
911         }
912         return &fl->generic_hdr;
913 }
914 
915 /*
916  * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
917  *
918  * return true  : coalesce page
919  * return false : don't coalesce page
920  */
921 static bool
922 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
923                    struct nfs_page *req)
924 {
925         u64 p_stripe, r_stripe;
926         u32 stripe_unit;
927 
928         if (!pnfs_generic_pg_test(pgio, prev, req) ||
929             !nfs_generic_pg_test(pgio, prev, req))
930                 return false;
931 
932         p_stripe = (u64)req_offset(prev);
933         r_stripe = (u64)req_offset(req);
934         stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
935 
936         do_div(p_stripe, stripe_unit);
937         do_div(r_stripe, stripe_unit);
938 
939         return (p_stripe == r_stripe);
940 }
941 
942 static void
943 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
944                         struct nfs_page *req)
945 {
946         WARN_ON_ONCE(pgio->pg_lseg != NULL);
947 
948         if (req->wb_offset != req->wb_pgbase) {
949                 /*
950                  * Handling unaligned pages is difficult, because have to
951                  * somehow split a req in two in certain cases in the
952                  * pg.test code.  Avoid this by just not using pnfs
953                  * in this case.
954                  */
955                 nfs_pageio_reset_read_mds(pgio);
956                 return;
957         }
958         pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
959                                            req->wb_context,
960                                            0,
961                                            NFS4_MAX_UINT64,
962                                            IOMODE_READ,
963                                            GFP_KERNEL);
964         /* If no lseg, fall back to read through mds */
965         if (pgio->pg_lseg == NULL)
966                 nfs_pageio_reset_read_mds(pgio);
967 }
968 
969 static void
970 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
971                          struct nfs_page *req)
972 {
973         struct nfs_commit_info cinfo;
974         int status;
975 
976         WARN_ON_ONCE(pgio->pg_lseg != NULL);
977 
978         if (req->wb_offset != req->wb_pgbase)
979                 goto out_mds;
980         pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
981                                            req->wb_context,
982                                            0,
983                                            NFS4_MAX_UINT64,
984                                            IOMODE_RW,
985                                            GFP_NOFS);
986         /* If no lseg, fall back to write through mds */
987         if (pgio->pg_lseg == NULL)
988                 goto out_mds;
989         nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
990         status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
991         if (status < 0) {
992                 pnfs_put_lseg(pgio->pg_lseg);
993                 pgio->pg_lseg = NULL;
994                 goto out_mds;
995         }
996         return;
997 out_mds:
998         nfs_pageio_reset_write_mds(pgio);
999 }
1000 
1001 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
1002         .pg_init = filelayout_pg_init_read,
1003         .pg_test = filelayout_pg_test,
1004         .pg_doio = pnfs_generic_pg_readpages,
1005 };
1006 
1007 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
1008         .pg_init = filelayout_pg_init_write,
1009         .pg_test = filelayout_pg_test,
1010         .pg_doio = pnfs_generic_pg_writepages,
1011 };
1012 
1013 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
1014 {
1015         if (fl->stripe_type == STRIPE_SPARSE)
1016                 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
1017         else
1018                 return j;
1019 }
1020 
1021 /* The generic layer is about to remove the req from the commit list.
1022  * If this will make the bucket empty, it will need to put the lseg reference.
1023  */
1024 static void
1025 filelayout_clear_request_commit(struct nfs_page *req,
1026                                 struct nfs_commit_info *cinfo)
1027 {
1028         struct pnfs_layout_segment *freeme = NULL;
1029 
1030         spin_lock(cinfo->lock);
1031         if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
1032                 goto out;
1033         cinfo->ds->nwritten--;
1034         if (list_is_singular(&req->wb_list)) {
1035                 struct pnfs_commit_bucket *bucket;
1036 
1037                 bucket = list_first_entry(&req->wb_list,
1038                                           struct pnfs_commit_bucket,
1039                                           written);
1040                 freeme = bucket->wlseg;
1041                 bucket->wlseg = NULL;
1042         }
1043 out:
1044         nfs_request_remove_commit_list(req, cinfo);
1045         spin_unlock(cinfo->lock);
1046         pnfs_put_lseg(freeme);
1047 }
1048 
1049 static struct list_head *
1050 filelayout_choose_commit_list(struct nfs_page *req,
1051                               struct pnfs_layout_segment *lseg,
1052                               struct nfs_commit_info *cinfo)
1053 {
1054         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
1055         u32 i, j;
1056         struct list_head *list;
1057         struct pnfs_commit_bucket *buckets;
1058 
1059         if (fl->commit_through_mds)
1060                 return &cinfo->mds->list;
1061 
1062         /* Note that we are calling nfs4_fl_calc_j_index on each page
1063          * that ends up being committed to a data server.  An attractive
1064          * alternative is to add a field to nfs_write_data and nfs_page
1065          * to store the value calculated in filelayout_write_pagelist
1066          * and just use that here.
1067          */
1068         j = nfs4_fl_calc_j_index(lseg, req_offset(req));
1069         i = select_bucket_index(fl, j);
1070         buckets = cinfo->ds->buckets;
1071         list = &buckets[i].written;
1072         if (list_empty(list)) {
1073                 /* Non-empty buckets hold a reference on the lseg.  That ref
1074                  * is normally transferred to the COMMIT call and released
1075                  * there.  It could also be released if the last req is pulled
1076                  * off due to a rewrite, in which case it will be done in
1077                  * filelayout_clear_request_commit
1078                  */
1079                 buckets[i].wlseg = pnfs_get_lseg(lseg);
1080         }
1081         set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1082         cinfo->ds->nwritten++;
1083         return list;
1084 }
1085 
1086 static void
1087 filelayout_mark_request_commit(struct nfs_page *req,
1088                                struct pnfs_layout_segment *lseg,
1089                                struct nfs_commit_info *cinfo)
1090 {
1091         struct list_head *list;
1092 
1093         list = filelayout_choose_commit_list(req, lseg, cinfo);
1094         nfs_request_add_commit_list(req, list, cinfo);
1095 }
1096 
1097 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1098 {
1099         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1100 
1101         if (flseg->stripe_type == STRIPE_SPARSE)
1102                 return i;
1103         else
1104                 return nfs4_fl_calc_ds_index(lseg, i);
1105 }
1106 
1107 static struct nfs_fh *
1108 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1109 {
1110         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1111 
1112         if (flseg->stripe_type == STRIPE_SPARSE) {
1113                 if (flseg->num_fh == 1)
1114                         i = 0;
1115                 else if (flseg->num_fh == 0)
1116                         /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1117                         return NULL;
1118         }
1119         return flseg->fh_array[i];
1120 }
1121 
1122 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1123 {
1124         struct pnfs_layout_segment *lseg = data->lseg;
1125         struct nfs4_pnfs_ds *ds;
1126         struct rpc_clnt *ds_clnt;
1127         u32 idx;
1128         struct nfs_fh *fh;
1129 
1130         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1131         ds = nfs4_fl_prepare_ds(lseg, idx);
1132         if (!ds)
1133                 goto out_err;
1134 
1135         ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode);
1136         if (IS_ERR(ds_clnt))
1137                 goto out_err;
1138 
1139         dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1140                 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1141         data->commit_done_cb = filelayout_commit_done_cb;
1142         atomic_inc(&ds->ds_clp->cl_count);
1143         data->ds_clp = ds->ds_clp;
1144         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1145         if (fh)
1146                 data->args.fh = fh;
1147         return nfs_initiate_commit(ds_clnt, data,
1148                                    &filelayout_commit_call_ops, how,
1149                                    RPC_TASK_SOFTCONN);
1150 out_err:
1151         prepare_to_resend_writes(data);
1152         filelayout_commit_release(data);
1153         return -EAGAIN;
1154 }
1155 
1156 static int
1157 transfer_commit_list(struct list_head *src, struct list_head *dst,
1158                      struct nfs_commit_info *cinfo, int max)
1159 {
1160         struct nfs_page *req, *tmp;
1161         int ret = 0;
1162 
1163         list_for_each_entry_safe(req, tmp, src, wb_list) {
1164                 if (!nfs_lock_request(req))
1165                         continue;
1166                 kref_get(&req->wb_kref);
1167                 if (cond_resched_lock(cinfo->lock))
1168                         list_safe_reset_next(req, tmp, wb_list);
1169                 nfs_request_remove_commit_list(req, cinfo);
1170                 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1171                 nfs_list_add_request(req, dst);
1172                 ret++;
1173                 if ((ret == max) && !cinfo->dreq)
1174                         break;
1175         }
1176         return ret;
1177 }
1178 
1179 static int
1180 filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
1181                                struct nfs_commit_info *cinfo,
1182                                int max)
1183 {
1184         struct list_head *src = &bucket->written;
1185         struct list_head *dst = &bucket->committing;
1186         int ret;
1187 
1188         ret = transfer_commit_list(src, dst, cinfo, max);
1189         if (ret) {
1190                 cinfo->ds->nwritten -= ret;
1191                 cinfo->ds->ncommitting += ret;
1192                 bucket->clseg = bucket->wlseg;
1193                 if (list_empty(src))
1194                         bucket->wlseg = NULL;
1195                 else
1196                         pnfs_get_lseg(bucket->clseg);
1197         }
1198         return ret;
1199 }
1200 
1201 /* Move reqs from written to committing lists, returning count of number moved.
1202  * Note called with cinfo->lock held.
1203  */
1204 static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo,
1205                                         int max)
1206 {
1207         int i, rv = 0, cnt;
1208 
1209         for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
1210                 cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i],
1211                                                      cinfo, max);
1212                 max -= cnt;
1213                 rv += cnt;
1214         }
1215         return rv;
1216 }
1217 
1218 /* Pull everything off the committing lists and dump into @dst */
1219 static void filelayout_recover_commit_reqs(struct list_head *dst,
1220                                            struct nfs_commit_info *cinfo)
1221 {
1222         struct pnfs_commit_bucket *b;
1223         int i;
1224 
1225         spin_lock(cinfo->lock);
1226         for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1227                 if (transfer_commit_list(&b->written, dst, cinfo, 0)) {
1228                         spin_unlock(cinfo->lock);
1229                         pnfs_put_lseg(b->wlseg);
1230                         b->wlseg = NULL;
1231                         spin_lock(cinfo->lock);
1232                 }
1233         }
1234         cinfo->ds->nwritten = 0;
1235         spin_unlock(cinfo->lock);
1236 }
1237 
1238 static unsigned int
1239 alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list)
1240 {
1241         struct pnfs_ds_commit_info *fl_cinfo;
1242         struct pnfs_commit_bucket *bucket;
1243         struct nfs_commit_data *data;
1244         int i, j;
1245         unsigned int nreq = 0;
1246 
1247         fl_cinfo = cinfo->ds;
1248         bucket = fl_cinfo->buckets;
1249         for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
1250                 if (list_empty(&bucket->committing))
1251                         continue;
1252                 data = nfs_commitdata_alloc();
1253                 if (!data)
1254                         break;
1255                 data->ds_commit_index = i;
1256                 data->lseg = bucket->clseg;
1257                 bucket->clseg = NULL;
1258                 list_add(&data->pages, list);
1259                 nreq++;
1260         }
1261 
1262         /* Clean up on error */
1263         for (j = i; j < fl_cinfo->nbuckets; j++, bucket++) {
1264                 if (list_empty(&bucket->committing))
1265                         continue;
1266                 nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo);
1267                 pnfs_put_lseg(bucket->clseg);
1268                 bucket->clseg = NULL;
1269         }
1270         /* Caller will clean up entries put on list */
1271         return nreq;
1272 }
1273 
1274 /* This follows nfs_commit_list pretty closely */
1275 static int
1276 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1277                            int how, struct nfs_commit_info *cinfo)
1278 {
1279         struct nfs_commit_data *data, *tmp;
1280         LIST_HEAD(list);
1281         unsigned int nreq = 0;
1282 
1283         if (!list_empty(mds_pages)) {
1284                 data = nfs_commitdata_alloc();
1285                 if (data != NULL) {
1286                         data->lseg = NULL;
1287                         list_add(&data->pages, &list);
1288                         nreq++;
1289                 } else
1290                         nfs_retry_commit(mds_pages, NULL, cinfo);
1291         }
1292 
1293         nreq += alloc_ds_commits(cinfo, &list);
1294 
1295         if (nreq == 0) {
1296                 cinfo->completion_ops->error_cleanup(NFS_I(inode));
1297                 goto out;
1298         }
1299 
1300         atomic_add(nreq, &cinfo->mds->rpcs_out);
1301 
1302         list_for_each_entry_safe(data, tmp, &list, pages) {
1303                 list_del_init(&data->pages);
1304                 if (!data->lseg) {
1305                         nfs_init_commit(data, mds_pages, NULL, cinfo);
1306                         nfs_initiate_commit(NFS_CLIENT(inode), data,
1307                                             data->mds_ops, how, 0);
1308                 } else {
1309                         struct pnfs_commit_bucket *buckets;
1310 
1311                         buckets = cinfo->ds->buckets;
1312                         nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo);
1313                         filelayout_initiate_commit(data, how);
1314                 }
1315         }
1316 out:
1317         cinfo->ds->ncommitting = 0;
1318         return PNFS_ATTEMPTED;
1319 }
1320 
1321 static void
1322 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1323 {
1324         nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1325 }
1326 
1327 static struct pnfs_layout_hdr *
1328 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1329 {
1330         struct nfs4_filelayout *flo;
1331 
1332         flo = kzalloc(sizeof(*flo), gfp_flags);
1333         return flo != NULL ? &flo->generic_hdr : NULL;
1334 }
1335 
1336 static void
1337 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1338 {
1339         kfree(FILELAYOUT_FROM_HDR(lo));
1340 }
1341 
1342 static struct pnfs_ds_commit_info *
1343 filelayout_get_ds_info(struct inode *inode)
1344 {
1345         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1346 
1347         if (layout == NULL)
1348                 return NULL;
1349         else
1350                 return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1351 }
1352 
1353 static struct pnfs_layoutdriver_type filelayout_type = {
1354         .id                     = LAYOUT_NFSV4_1_FILES,
1355         .name                   = "LAYOUT_NFSV4_1_FILES",
1356         .owner                  = THIS_MODULE,
1357         .alloc_layout_hdr       = filelayout_alloc_layout_hdr,
1358         .free_layout_hdr        = filelayout_free_layout_hdr,
1359         .alloc_lseg             = filelayout_alloc_lseg,
1360         .free_lseg              = filelayout_free_lseg,
1361         .pg_read_ops            = &filelayout_pg_read_ops,
1362         .pg_write_ops           = &filelayout_pg_write_ops,
1363         .get_ds_info            = &filelayout_get_ds_info,
1364         .mark_request_commit    = filelayout_mark_request_commit,
1365         .clear_request_commit   = filelayout_clear_request_commit,
1366         .scan_commit_lists      = filelayout_scan_commit_lists,
1367         .recover_commit_reqs    = filelayout_recover_commit_reqs,
1368         .commit_pagelist        = filelayout_commit_pagelist,
1369         .read_pagelist          = filelayout_read_pagelist,
1370         .write_pagelist         = filelayout_write_pagelist,
1371         .free_deviceid_node     = filelayout_free_deveiceid_node,
1372 };
1373 
1374 static int __init nfs4filelayout_init(void)
1375 {
1376         printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1377                __func__);
1378         return pnfs_register_layoutdriver(&filelayout_type);
1379 }
1380 
1381 static void __exit nfs4filelayout_exit(void)
1382 {
1383         printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1384                __func__);
1385         pnfs_unregister_layoutdriver(&filelayout_type);
1386 }
1387 
1388 MODULE_ALIAS("nfs-layouttype4-1");
1389 
1390 module_init(nfs4filelayout_init);
1391 module_exit(nfs4filelayout_exit);
1392 

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