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1 | /* | |
2 | * Module for the pnfs nfs4 file layout driver. | |
3 | * Defines all I/O and Policy interface operations, plus code | |
4 | * to register itself with the pNFS client. | |
5 | * | |
6 | * Copyright (c) 2002 | |
7 | * The Regents of the University of Michigan | |
8 | * All Rights Reserved | |
9 | * | |
10 | * Dean Hildebrand <dhildebz@umich.edu> | |
11 | * | |
12 | * Permission is granted to use, copy, create derivative works, and | |
13 | * redistribute this software and such derivative works for any purpose, | |
14 | * so long as the name of the University of Michigan is not used in | |
15 | * any advertising or publicity pertaining to the use or distribution | |
16 | * of this software without specific, written prior authorization. If | |
17 | * the above copyright notice or any other identification of the | |
18 | * University of Michigan is included in any copy of any portion of | |
19 | * this software, then the disclaimer below must also be included. | |
20 | * | |
21 | * This software is provided as is, without representation or warranty | |
22 | * of any kind either express or implied, including without limitation | |
23 | * the implied warranties of merchantability, fitness for a particular | |
24 | * purpose, or noninfringement. The Regents of the University of | |
25 | * Michigan shall not be liable for any damages, including special, | |
26 | * indirect, incidental, or consequential damages, with respect to any | |
27 | * claim arising out of or in connection with the use of the software, | |
28 | * even if it has been or is hereafter advised of the possibility of | |
29 | * such damages. | |
30 | */ | |
31 | ||
32 | #include <linux/nfs_fs.h> | |
33 | #include <linux/nfs_page.h> | |
34 | #include <linux/module.h> | |
35 | ||
36 | #include <linux/sunrpc/metrics.h> | |
37 | ||
38 | #include "../nfs4session.h" | |
39 | #include "../internal.h" | |
40 | #include "../delegation.h" | |
41 | #include "filelayout.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_pgio_header *hdr) | |
88 | { | |
89 | struct rpc_task *task = &hdr->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/%llu, %u bytes @ offset %llu)\n", __func__, | |
94 | hdr->task.tk_pid, | |
95 | hdr->inode->i_sb->s_id, | |
96 | (unsigned long long)NFS_FILEID(hdr->inode), | |
97 | hdr->args.count, | |
98 | (unsigned long long)hdr->args.offset); | |
99 | ||
100 | task->tk_status = pnfs_write_done_resend_to_mds(hdr); | |
101 | } | |
102 | } | |
103 | ||
104 | static void filelayout_reset_read(struct nfs_pgio_header *hdr) | |
105 | { | |
106 | struct rpc_task *task = &hdr->task; | |
107 | ||
108 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { | |
109 | dprintk("%s Reset task %5u for i/o through MDS " | |
110 | "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, | |
111 | hdr->task.tk_pid, | |
112 | hdr->inode->i_sb->s_id, | |
113 | (unsigned long long)NFS_FILEID(hdr->inode), | |
114 | hdr->args.count, | |
115 | (unsigned long long)hdr->args.offset); | |
116 | ||
117 | task->tk_status = pnfs_read_done_resend_to_mds(hdr); | |
118 | } | |
119 | } | |
120 | ||
121 | static int filelayout_async_handle_error(struct rpc_task *task, | |
122 | struct nfs4_state *state, | |
123 | struct nfs_client *clp, | |
124 | struct pnfs_layout_segment *lseg) | |
125 | { | |
126 | struct pnfs_layout_hdr *lo = lseg->pls_layout; | |
127 | struct inode *inode = lo->plh_inode; | |
128 | struct nfs_server *mds_server = NFS_SERVER(inode); | |
129 | struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); | |
130 | struct nfs_client *mds_client = mds_server->nfs_client; | |
131 | struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; | |
132 | ||
133 | if (task->tk_status >= 0) | |
134 | return 0; | |
135 | ||
136 | switch (task->tk_status) { | |
137 | /* MDS state errors */ | |
138 | case -NFS4ERR_DELEG_REVOKED: | |
139 | case -NFS4ERR_ADMIN_REVOKED: | |
140 | case -NFS4ERR_BAD_STATEID: | |
141 | case -NFS4ERR_OPENMODE: | |
142 | if (state == NULL) | |
143 | break; | |
144 | if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) | |
145 | goto out_bad_stateid; | |
146 | goto wait_on_recovery; | |
147 | case -NFS4ERR_EXPIRED: | |
148 | if (state != NULL) { | |
149 | if (nfs4_schedule_stateid_recovery(mds_server, state) < 0) | |
150 | goto out_bad_stateid; | |
151 | } | |
152 | nfs4_schedule_lease_recovery(mds_client); | |
153 | goto wait_on_recovery; | |
154 | /* DS session errors */ | |
155 | case -NFS4ERR_BADSESSION: | |
156 | case -NFS4ERR_BADSLOT: | |
157 | case -NFS4ERR_BAD_HIGH_SLOT: | |
158 | case -NFS4ERR_DEADSESSION: | |
159 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
160 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
161 | case -NFS4ERR_SEQ_MISORDERED: | |
162 | dprintk("%s ERROR %d, Reset session. Exchangeid " | |
163 | "flags 0x%x\n", __func__, task->tk_status, | |
164 | clp->cl_exchange_flags); | |
165 | nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); | |
166 | break; | |
167 | case -NFS4ERR_DELAY: | |
168 | case -NFS4ERR_GRACE: | |
169 | rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); | |
170 | break; | |
171 | case -NFS4ERR_RETRY_UNCACHED_REP: | |
172 | break; | |
173 | /* Invalidate Layout errors */ | |
174 | case -NFS4ERR_PNFS_NO_LAYOUT: | |
175 | case -ESTALE: /* mapped NFS4ERR_STALE */ | |
176 | case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ | |
177 | case -EISDIR: /* mapped NFS4ERR_ISDIR */ | |
178 | case -NFS4ERR_FHEXPIRED: | |
179 | case -NFS4ERR_WRONG_TYPE: | |
180 | dprintk("%s Invalid layout error %d\n", __func__, | |
181 | task->tk_status); | |
182 | /* | |
183 | * Destroy layout so new i/o will get a new layout. | |
184 | * Layout will not be destroyed until all current lseg | |
185 | * references are put. Mark layout as invalid to resend failed | |
186 | * i/o and all i/o waiting on the slot table to the MDS until | |
187 | * layout is destroyed and a new valid layout is obtained. | |
188 | */ | |
189 | pnfs_destroy_layout(NFS_I(inode)); | |
190 | rpc_wake_up(&tbl->slot_tbl_waitq); | |
191 | goto reset; | |
192 | /* RPC connection errors */ | |
193 | case -ECONNREFUSED: | |
194 | case -EHOSTDOWN: | |
195 | case -EHOSTUNREACH: | |
196 | case -ENETUNREACH: | |
197 | case -EIO: | |
198 | case -ETIMEDOUT: | |
199 | case -EPIPE: | |
200 | dprintk("%s DS connection error %d\n", __func__, | |
201 | task->tk_status); | |
202 | nfs4_mark_deviceid_unavailable(devid); | |
203 | pnfs_error_mark_layout_for_return(inode, lseg); | |
204 | rpc_wake_up(&tbl->slot_tbl_waitq); | |
205 | /* fall through */ | |
206 | default: | |
207 | reset: | |
208 | dprintk("%s Retry through MDS. Error %d\n", __func__, | |
209 | task->tk_status); | |
210 | return -NFS4ERR_RESET_TO_MDS; | |
211 | } | |
212 | out: | |
213 | task->tk_status = 0; | |
214 | return -EAGAIN; | |
215 | out_bad_stateid: | |
216 | task->tk_status = -EIO; | |
217 | return 0; | |
218 | wait_on_recovery: | |
219 | rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL); | |
220 | if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0) | |
221 | rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task); | |
222 | goto out; | |
223 | } | |
224 | ||
225 | /* NFS_PROTO call done callback routines */ | |
226 | ||
227 | static int filelayout_read_done_cb(struct rpc_task *task, | |
228 | struct nfs_pgio_header *hdr) | |
229 | { | |
230 | int err; | |
231 | ||
232 | trace_nfs4_pnfs_read(hdr, task->tk_status); | |
233 | err = filelayout_async_handle_error(task, hdr->args.context->state, | |
234 | hdr->ds_clp, hdr->lseg); | |
235 | ||
236 | switch (err) { | |
237 | case -NFS4ERR_RESET_TO_MDS: | |
238 | filelayout_reset_read(hdr); | |
239 | return task->tk_status; | |
240 | case -EAGAIN: | |
241 | rpc_restart_call_prepare(task); | |
242 | return -EAGAIN; | |
243 | } | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | /* | |
249 | * We reference the rpc_cred of the first WRITE that triggers the need for | |
250 | * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. | |
251 | * rfc5661 is not clear about which credential should be used. | |
252 | */ | |
253 | static void | |
254 | filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) | |
255 | { | |
256 | ||
257 | if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || | |
258 | hdr->res.verf->committed != NFS_DATA_SYNC) | |
259 | return; | |
260 | ||
261 | pnfs_set_layoutcommit(hdr); | |
262 | dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, | |
263 | (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); | |
264 | } | |
265 | ||
266 | bool | |
267 | filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) | |
268 | { | |
269 | return filelayout_test_devid_invalid(node) || | |
270 | nfs4_test_deviceid_unavailable(node); | |
271 | } | |
272 | ||
273 | static bool | |
274 | filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) | |
275 | { | |
276 | struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); | |
277 | ||
278 | return filelayout_test_devid_unavailable(node); | |
279 | } | |
280 | ||
281 | /* | |
282 | * Call ops for the async read/write cases | |
283 | * In the case of dense layouts, the offset needs to be reset to its | |
284 | * original value. | |
285 | */ | |
286 | static void filelayout_read_prepare(struct rpc_task *task, void *data) | |
287 | { | |
288 | struct nfs_pgio_header *hdr = data; | |
289 | ||
290 | if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { | |
291 | rpc_exit(task, -EIO); | |
292 | return; | |
293 | } | |
294 | if (filelayout_reset_to_mds(hdr->lseg)) { | |
295 | dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); | |
296 | filelayout_reset_read(hdr); | |
297 | rpc_exit(task, 0); | |
298 | return; | |
299 | } | |
300 | hdr->pgio_done_cb = filelayout_read_done_cb; | |
301 | ||
302 | if (nfs41_setup_sequence(hdr->ds_clp->cl_session, | |
303 | &hdr->args.seq_args, | |
304 | &hdr->res.seq_res, | |
305 | task)) | |
306 | return; | |
307 | if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, | |
308 | hdr->args.lock_context, FMODE_READ) == -EIO) | |
309 | rpc_exit(task, -EIO); /* lost lock, terminate I/O */ | |
310 | } | |
311 | ||
312 | static void filelayout_read_call_done(struct rpc_task *task, void *data) | |
313 | { | |
314 | struct nfs_pgio_header *hdr = data; | |
315 | ||
316 | dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); | |
317 | ||
318 | if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && | |
319 | task->tk_status == 0) { | |
320 | nfs41_sequence_done(task, &hdr->res.seq_res); | |
321 | return; | |
322 | } | |
323 | ||
324 | /* Note this may cause RPC to be resent */ | |
325 | hdr->mds_ops->rpc_call_done(task, data); | |
326 | } | |
327 | ||
328 | static void filelayout_read_count_stats(struct rpc_task *task, void *data) | |
329 | { | |
330 | struct nfs_pgio_header *hdr = data; | |
331 | ||
332 | rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); | |
333 | } | |
334 | ||
335 | static int filelayout_write_done_cb(struct rpc_task *task, | |
336 | struct nfs_pgio_header *hdr) | |
337 | { | |
338 | int err; | |
339 | ||
340 | trace_nfs4_pnfs_write(hdr, task->tk_status); | |
341 | err = filelayout_async_handle_error(task, hdr->args.context->state, | |
342 | hdr->ds_clp, hdr->lseg); | |
343 | ||
344 | switch (err) { | |
345 | case -NFS4ERR_RESET_TO_MDS: | |
346 | filelayout_reset_write(hdr); | |
347 | return task->tk_status; | |
348 | case -EAGAIN: | |
349 | rpc_restart_call_prepare(task); | |
350 | return -EAGAIN; | |
351 | } | |
352 | ||
353 | filelayout_set_layoutcommit(hdr); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int filelayout_commit_done_cb(struct rpc_task *task, | |
358 | struct nfs_commit_data *data) | |
359 | { | |
360 | int err; | |
361 | ||
362 | trace_nfs4_pnfs_commit_ds(data, task->tk_status); | |
363 | err = filelayout_async_handle_error(task, NULL, data->ds_clp, | |
364 | data->lseg); | |
365 | ||
366 | switch (err) { | |
367 | case -NFS4ERR_RESET_TO_MDS: | |
368 | pnfs_generic_prepare_to_resend_writes(data); | |
369 | return -EAGAIN; | |
370 | case -EAGAIN: | |
371 | rpc_restart_call_prepare(task); | |
372 | return -EAGAIN; | |
373 | } | |
374 | ||
375 | if (data->verf.committed == NFS_UNSTABLE) | |
376 | pnfs_commit_set_layoutcommit(data); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static void filelayout_write_prepare(struct rpc_task *task, void *data) | |
382 | { | |
383 | struct nfs_pgio_header *hdr = data; | |
384 | ||
385 | if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { | |
386 | rpc_exit(task, -EIO); | |
387 | return; | |
388 | } | |
389 | if (filelayout_reset_to_mds(hdr->lseg)) { | |
390 | dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); | |
391 | filelayout_reset_write(hdr); | |
392 | rpc_exit(task, 0); | |
393 | return; | |
394 | } | |
395 | if (nfs41_setup_sequence(hdr->ds_clp->cl_session, | |
396 | &hdr->args.seq_args, | |
397 | &hdr->res.seq_res, | |
398 | task)) | |
399 | return; | |
400 | if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, | |
401 | hdr->args.lock_context, FMODE_WRITE) == -EIO) | |
402 | rpc_exit(task, -EIO); /* lost lock, terminate I/O */ | |
403 | } | |
404 | ||
405 | static void filelayout_write_call_done(struct rpc_task *task, void *data) | |
406 | { | |
407 | struct nfs_pgio_header *hdr = data; | |
408 | ||
409 | if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && | |
410 | task->tk_status == 0) { | |
411 | nfs41_sequence_done(task, &hdr->res.seq_res); | |
412 | return; | |
413 | } | |
414 | ||
415 | /* Note this may cause RPC to be resent */ | |
416 | hdr->mds_ops->rpc_call_done(task, data); | |
417 | } | |
418 | ||
419 | static void filelayout_write_count_stats(struct rpc_task *task, void *data) | |
420 | { | |
421 | struct nfs_pgio_header *hdr = data; | |
422 | ||
423 | rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); | |
424 | } | |
425 | ||
426 | static void filelayout_commit_prepare(struct rpc_task *task, void *data) | |
427 | { | |
428 | struct nfs_commit_data *wdata = data; | |
429 | ||
430 | nfs41_setup_sequence(wdata->ds_clp->cl_session, | |
431 | &wdata->args.seq_args, | |
432 | &wdata->res.seq_res, | |
433 | task); | |
434 | } | |
435 | ||
436 | static void filelayout_commit_count_stats(struct rpc_task *task, void *data) | |
437 | { | |
438 | struct nfs_commit_data *cdata = data; | |
439 | ||
440 | rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); | |
441 | } | |
442 | ||
443 | static const struct rpc_call_ops filelayout_read_call_ops = { | |
444 | .rpc_call_prepare = filelayout_read_prepare, | |
445 | .rpc_call_done = filelayout_read_call_done, | |
446 | .rpc_count_stats = filelayout_read_count_stats, | |
447 | .rpc_release = pnfs_generic_rw_release, | |
448 | }; | |
449 | ||
450 | static const struct rpc_call_ops filelayout_write_call_ops = { | |
451 | .rpc_call_prepare = filelayout_write_prepare, | |
452 | .rpc_call_done = filelayout_write_call_done, | |
453 | .rpc_count_stats = filelayout_write_count_stats, | |
454 | .rpc_release = pnfs_generic_rw_release, | |
455 | }; | |
456 | ||
457 | static const struct rpc_call_ops filelayout_commit_call_ops = { | |
458 | .rpc_call_prepare = filelayout_commit_prepare, | |
459 | .rpc_call_done = pnfs_generic_write_commit_done, | |
460 | .rpc_count_stats = filelayout_commit_count_stats, | |
461 | .rpc_release = pnfs_generic_commit_release, | |
462 | }; | |
463 | ||
464 | static enum pnfs_try_status | |
465 | filelayout_read_pagelist(struct nfs_pgio_header *hdr) | |
466 | { | |
467 | struct pnfs_layout_segment *lseg = hdr->lseg; | |
468 | struct nfs4_pnfs_ds *ds; | |
469 | struct rpc_clnt *ds_clnt; | |
470 | loff_t offset = hdr->args.offset; | |
471 | u32 j, idx; | |
472 | struct nfs_fh *fh; | |
473 | ||
474 | dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", | |
475 | __func__, hdr->inode->i_ino, | |
476 | hdr->args.pgbase, (size_t)hdr->args.count, offset); | |
477 | ||
478 | /* Retrieve the correct rpc_client for the byte range */ | |
479 | j = nfs4_fl_calc_j_index(lseg, offset); | |
480 | idx = nfs4_fl_calc_ds_index(lseg, j); | |
481 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
482 | if (!ds) | |
483 | return PNFS_NOT_ATTEMPTED; | |
484 | ||
485 | ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); | |
486 | if (IS_ERR(ds_clnt)) | |
487 | return PNFS_NOT_ATTEMPTED; | |
488 | ||
489 | dprintk("%s USE DS: %s cl_count %d\n", __func__, | |
490 | ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); | |
491 | ||
492 | /* No multipath support. Use first DS */ | |
493 | atomic_inc(&ds->ds_clp->cl_count); | |
494 | hdr->ds_clp = ds->ds_clp; | |
495 | hdr->ds_commit_idx = idx; | |
496 | fh = nfs4_fl_select_ds_fh(lseg, j); | |
497 | if (fh) | |
498 | hdr->args.fh = fh; | |
499 | ||
500 | hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); | |
501 | hdr->mds_offset = offset; | |
502 | ||
503 | /* Perform an asynchronous read to ds */ | |
504 | nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, | |
505 | NFS_PROTO(hdr->inode), &filelayout_read_call_ops, | |
506 | 0, RPC_TASK_SOFTCONN); | |
507 | return PNFS_ATTEMPTED; | |
508 | } | |
509 | ||
510 | /* Perform async writes. */ | |
511 | static enum pnfs_try_status | |
512 | filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) | |
513 | { | |
514 | struct pnfs_layout_segment *lseg = hdr->lseg; | |
515 | struct nfs4_pnfs_ds *ds; | |
516 | struct rpc_clnt *ds_clnt; | |
517 | loff_t offset = hdr->args.offset; | |
518 | u32 j, idx; | |
519 | struct nfs_fh *fh; | |
520 | ||
521 | /* Retrieve the correct rpc_client for the byte range */ | |
522 | j = nfs4_fl_calc_j_index(lseg, offset); | |
523 | idx = nfs4_fl_calc_ds_index(lseg, j); | |
524 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
525 | if (!ds) | |
526 | return PNFS_NOT_ATTEMPTED; | |
527 | ||
528 | ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); | |
529 | if (IS_ERR(ds_clnt)) | |
530 | return PNFS_NOT_ATTEMPTED; | |
531 | ||
532 | dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n", | |
533 | __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, | |
534 | offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count)); | |
535 | ||
536 | hdr->pgio_done_cb = filelayout_write_done_cb; | |
537 | atomic_inc(&ds->ds_clp->cl_count); | |
538 | hdr->ds_clp = ds->ds_clp; | |
539 | hdr->ds_commit_idx = idx; | |
540 | fh = nfs4_fl_select_ds_fh(lseg, j); | |
541 | if (fh) | |
542 | hdr->args.fh = fh; | |
543 | hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); | |
544 | ||
545 | /* Perform an asynchronous write */ | |
546 | nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, | |
547 | NFS_PROTO(hdr->inode), &filelayout_write_call_ops, | |
548 | sync, RPC_TASK_SOFTCONN); | |
549 | return PNFS_ATTEMPTED; | |
550 | } | |
551 | ||
552 | /* | |
553 | * filelayout_check_layout() | |
554 | * | |
555 | * Make sure layout segment parameters are sane WRT the device. | |
556 | * At this point no generic layer initialization of the lseg has occurred, | |
557 | * and nothing has been added to the layout_hdr cache. | |
558 | * | |
559 | */ | |
560 | static int | |
561 | filelayout_check_layout(struct pnfs_layout_hdr *lo, | |
562 | struct nfs4_filelayout_segment *fl, | |
563 | struct nfs4_layoutget_res *lgr, | |
564 | struct nfs4_deviceid *id, | |
565 | gfp_t gfp_flags) | |
566 | { | |
567 | struct nfs4_deviceid_node *d; | |
568 | struct nfs4_file_layout_dsaddr *dsaddr; | |
569 | int status = -EINVAL; | |
570 | ||
571 | dprintk("--> %s\n", __func__); | |
572 | ||
573 | /* FIXME: remove this check when layout segment support is added */ | |
574 | if (lgr->range.offset != 0 || | |
575 | lgr->range.length != NFS4_MAX_UINT64) { | |
576 | dprintk("%s Only whole file layouts supported. Use MDS i/o\n", | |
577 | __func__); | |
578 | goto out; | |
579 | } | |
580 | ||
581 | if (fl->pattern_offset > lgr->range.offset) { | |
582 | dprintk("%s pattern_offset %lld too large\n", | |
583 | __func__, fl->pattern_offset); | |
584 | goto out; | |
585 | } | |
586 | ||
587 | if (!fl->stripe_unit) { | |
588 | dprintk("%s Invalid stripe unit (%u)\n", | |
589 | __func__, fl->stripe_unit); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | /* find and reference the deviceid */ | |
594 | d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id, | |
595 | lo->plh_lc_cred, gfp_flags); | |
596 | if (d == NULL) | |
597 | goto out; | |
598 | ||
599 | dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); | |
600 | /* Found deviceid is unavailable */ | |
601 | if (filelayout_test_devid_unavailable(&dsaddr->id_node)) | |
602 | goto out_put; | |
603 | ||
604 | fl->dsaddr = dsaddr; | |
605 | ||
606 | if (fl->first_stripe_index >= dsaddr->stripe_count) { | |
607 | dprintk("%s Bad first_stripe_index %u\n", | |
608 | __func__, fl->first_stripe_index); | |
609 | goto out_put; | |
610 | } | |
611 | ||
612 | if ((fl->stripe_type == STRIPE_SPARSE && | |
613 | fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || | |
614 | (fl->stripe_type == STRIPE_DENSE && | |
615 | fl->num_fh != dsaddr->stripe_count)) { | |
616 | dprintk("%s num_fh %u not valid for given packing\n", | |
617 | __func__, fl->num_fh); | |
618 | goto out_put; | |
619 | } | |
620 | ||
621 | status = 0; | |
622 | out: | |
623 | dprintk("--> %s returns %d\n", __func__, status); | |
624 | return status; | |
625 | out_put: | |
626 | nfs4_fl_put_deviceid(dsaddr); | |
627 | goto out; | |
628 | } | |
629 | ||
630 | static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) | |
631 | { | |
632 | int i; | |
633 | ||
634 | for (i = 0; i < fl->num_fh; i++) { | |
635 | if (!fl->fh_array[i]) | |
636 | break; | |
637 | kfree(fl->fh_array[i]); | |
638 | } | |
639 | kfree(fl->fh_array); | |
640 | fl->fh_array = NULL; | |
641 | } | |
642 | ||
643 | static void | |
644 | _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) | |
645 | { | |
646 | filelayout_free_fh_array(fl); | |
647 | kfree(fl); | |
648 | } | |
649 | ||
650 | static int | |
651 | filelayout_decode_layout(struct pnfs_layout_hdr *flo, | |
652 | struct nfs4_filelayout_segment *fl, | |
653 | struct nfs4_layoutget_res *lgr, | |
654 | struct nfs4_deviceid *id, | |
655 | gfp_t gfp_flags) | |
656 | { | |
657 | struct xdr_stream stream; | |
658 | struct xdr_buf buf; | |
659 | struct page *scratch; | |
660 | __be32 *p; | |
661 | uint32_t nfl_util; | |
662 | int i; | |
663 | ||
664 | dprintk("%s: set_layout_map Begin\n", __func__); | |
665 | ||
666 | scratch = alloc_page(gfp_flags); | |
667 | if (!scratch) | |
668 | return -ENOMEM; | |
669 | ||
670 | xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); | |
671 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); | |
672 | ||
673 | /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), | |
674 | * num_fh (4) */ | |
675 | p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); | |
676 | if (unlikely(!p)) | |
677 | goto out_err; | |
678 | ||
679 | memcpy(id, p, sizeof(*id)); | |
680 | p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); | |
681 | nfs4_print_deviceid(id); | |
682 | ||
683 | nfl_util = be32_to_cpup(p++); | |
684 | if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) | |
685 | fl->commit_through_mds = 1; | |
686 | if (nfl_util & NFL4_UFLG_DENSE) | |
687 | fl->stripe_type = STRIPE_DENSE; | |
688 | else | |
689 | fl->stripe_type = STRIPE_SPARSE; | |
690 | fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; | |
691 | ||
692 | fl->first_stripe_index = be32_to_cpup(p++); | |
693 | p = xdr_decode_hyper(p, &fl->pattern_offset); | |
694 | fl->num_fh = be32_to_cpup(p++); | |
695 | ||
696 | dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", | |
697 | __func__, nfl_util, fl->num_fh, fl->first_stripe_index, | |
698 | fl->pattern_offset); | |
699 | ||
700 | /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. | |
701 | * Futher checking is done in filelayout_check_layout */ | |
702 | if (fl->num_fh > | |
703 | max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) | |
704 | goto out_err; | |
705 | ||
706 | if (fl->num_fh > 0) { | |
707 | fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), | |
708 | gfp_flags); | |
709 | if (!fl->fh_array) | |
710 | goto out_err; | |
711 | } | |
712 | ||
713 | for (i = 0; i < fl->num_fh; i++) { | |
714 | /* Do we want to use a mempool here? */ | |
715 | fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); | |
716 | if (!fl->fh_array[i]) | |
717 | goto out_err_free; | |
718 | ||
719 | p = xdr_inline_decode(&stream, 4); | |
720 | if (unlikely(!p)) | |
721 | goto out_err_free; | |
722 | fl->fh_array[i]->size = be32_to_cpup(p++); | |
723 | if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { | |
724 | printk(KERN_ERR "NFS: Too big fh %d received %d\n", | |
725 | i, fl->fh_array[i]->size); | |
726 | goto out_err_free; | |
727 | } | |
728 | ||
729 | p = xdr_inline_decode(&stream, fl->fh_array[i]->size); | |
730 | if (unlikely(!p)) | |
731 | goto out_err_free; | |
732 | memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); | |
733 | dprintk("DEBUG: %s: fh len %d\n", __func__, | |
734 | fl->fh_array[i]->size); | |
735 | } | |
736 | ||
737 | __free_page(scratch); | |
738 | return 0; | |
739 | ||
740 | out_err_free: | |
741 | filelayout_free_fh_array(fl); | |
742 | out_err: | |
743 | __free_page(scratch); | |
744 | return -EIO; | |
745 | } | |
746 | ||
747 | static void | |
748 | filelayout_free_lseg(struct pnfs_layout_segment *lseg) | |
749 | { | |
750 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
751 | ||
752 | dprintk("--> %s\n", __func__); | |
753 | nfs4_fl_put_deviceid(fl->dsaddr); | |
754 | /* This assumes a single RW lseg */ | |
755 | if (lseg->pls_range.iomode == IOMODE_RW) { | |
756 | struct nfs4_filelayout *flo; | |
757 | ||
758 | flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); | |
759 | flo->commit_info.nbuckets = 0; | |
760 | kfree(flo->commit_info.buckets); | |
761 | flo->commit_info.buckets = NULL; | |
762 | } | |
763 | _filelayout_free_lseg(fl); | |
764 | } | |
765 | ||
766 | static int | |
767 | filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg, | |
768 | struct nfs_commit_info *cinfo, | |
769 | gfp_t gfp_flags) | |
770 | { | |
771 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
772 | struct pnfs_commit_bucket *buckets; | |
773 | int size, i; | |
774 | ||
775 | if (fl->commit_through_mds) | |
776 | return 0; | |
777 | ||
778 | size = (fl->stripe_type == STRIPE_SPARSE) ? | |
779 | fl->dsaddr->ds_num : fl->dsaddr->stripe_count; | |
780 | ||
781 | if (cinfo->ds->nbuckets >= size) { | |
782 | /* This assumes there is only one IOMODE_RW lseg. What | |
783 | * we really want to do is have a layout_hdr level | |
784 | * dictionary of <multipath_list4, fh> keys, each | |
785 | * associated with a struct list_head, populated by calls | |
786 | * to filelayout_write_pagelist(). | |
787 | * */ | |
788 | return 0; | |
789 | } | |
790 | ||
791 | buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket), | |
792 | gfp_flags); | |
793 | if (!buckets) | |
794 | return -ENOMEM; | |
795 | for (i = 0; i < size; i++) { | |
796 | INIT_LIST_HEAD(&buckets[i].written); | |
797 | INIT_LIST_HEAD(&buckets[i].committing); | |
798 | /* mark direct verifier as unset */ | |
799 | buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; | |
800 | } | |
801 | ||
802 | spin_lock(cinfo->lock); | |
803 | if (cinfo->ds->nbuckets >= size) | |
804 | goto out; | |
805 | for (i = 0; i < cinfo->ds->nbuckets; i++) { | |
806 | list_splice(&cinfo->ds->buckets[i].written, | |
807 | &buckets[i].written); | |
808 | list_splice(&cinfo->ds->buckets[i].committing, | |
809 | &buckets[i].committing); | |
810 | buckets[i].direct_verf.committed = | |
811 | cinfo->ds->buckets[i].direct_verf.committed; | |
812 | buckets[i].wlseg = cinfo->ds->buckets[i].wlseg; | |
813 | buckets[i].clseg = cinfo->ds->buckets[i].clseg; | |
814 | } | |
815 | swap(cinfo->ds->buckets, buckets); | |
816 | cinfo->ds->nbuckets = size; | |
817 | out: | |
818 | spin_unlock(cinfo->lock); | |
819 | kfree(buckets); | |
820 | return 0; | |
821 | } | |
822 | ||
823 | static struct pnfs_layout_segment * | |
824 | filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, | |
825 | struct nfs4_layoutget_res *lgr, | |
826 | gfp_t gfp_flags) | |
827 | { | |
828 | struct nfs4_filelayout_segment *fl; | |
829 | int rc; | |
830 | struct nfs4_deviceid id; | |
831 | ||
832 | dprintk("--> %s\n", __func__); | |
833 | fl = kzalloc(sizeof(*fl), gfp_flags); | |
834 | if (!fl) | |
835 | return NULL; | |
836 | ||
837 | rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags); | |
838 | if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) { | |
839 | _filelayout_free_lseg(fl); | |
840 | return NULL; | |
841 | } | |
842 | return &fl->generic_hdr; | |
843 | } | |
844 | ||
845 | /* | |
846 | * filelayout_pg_test(). Called by nfs_can_coalesce_requests() | |
847 | * | |
848 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number | |
849 | * of bytes (maximum @req->wb_bytes) that can be coalesced. | |
850 | */ | |
851 | static size_t | |
852 | filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, | |
853 | struct nfs_page *req) | |
854 | { | |
855 | unsigned int size; | |
856 | u64 p_stripe, r_stripe; | |
857 | u32 stripe_offset; | |
858 | u64 segment_offset = pgio->pg_lseg->pls_range.offset; | |
859 | u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; | |
860 | ||
861 | /* calls nfs_generic_pg_test */ | |
862 | size = pnfs_generic_pg_test(pgio, prev, req); | |
863 | if (!size) | |
864 | return 0; | |
865 | ||
866 | /* see if req and prev are in the same stripe */ | |
867 | if (prev) { | |
868 | p_stripe = (u64)req_offset(prev) - segment_offset; | |
869 | r_stripe = (u64)req_offset(req) - segment_offset; | |
870 | do_div(p_stripe, stripe_unit); | |
871 | do_div(r_stripe, stripe_unit); | |
872 | ||
873 | if (p_stripe != r_stripe) | |
874 | return 0; | |
875 | } | |
876 | ||
877 | /* calculate remaining bytes in the current stripe */ | |
878 | div_u64_rem((u64)req_offset(req) - segment_offset, | |
879 | stripe_unit, | |
880 | &stripe_offset); | |
881 | WARN_ON_ONCE(stripe_offset > stripe_unit); | |
882 | if (stripe_offset >= stripe_unit) | |
883 | return 0; | |
884 | return min(stripe_unit - (unsigned int)stripe_offset, size); | |
885 | } | |
886 | ||
887 | static void | |
888 | filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, | |
889 | struct nfs_page *req) | |
890 | { | |
891 | if (!pgio->pg_lseg) | |
892 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, | |
893 | req->wb_context, | |
894 | 0, | |
895 | NFS4_MAX_UINT64, | |
896 | IOMODE_READ, | |
897 | GFP_KERNEL); | |
898 | /* If no lseg, fall back to read through mds */ | |
899 | if (pgio->pg_lseg == NULL) | |
900 | nfs_pageio_reset_read_mds(pgio); | |
901 | } | |
902 | ||
903 | static void | |
904 | filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, | |
905 | struct nfs_page *req) | |
906 | { | |
907 | struct nfs_commit_info cinfo; | |
908 | int status; | |
909 | ||
910 | if (!pgio->pg_lseg) | |
911 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, | |
912 | req->wb_context, | |
913 | 0, | |
914 | NFS4_MAX_UINT64, | |
915 | IOMODE_RW, | |
916 | GFP_NOFS); | |
917 | /* If no lseg, fall back to write through mds */ | |
918 | if (pgio->pg_lseg == NULL) | |
919 | goto out_mds; | |
920 | nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq); | |
921 | status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS); | |
922 | if (status < 0) { | |
923 | pnfs_put_lseg(pgio->pg_lseg); | |
924 | pgio->pg_lseg = NULL; | |
925 | goto out_mds; | |
926 | } | |
927 | return; | |
928 | out_mds: | |
929 | nfs_pageio_reset_write_mds(pgio); | |
930 | } | |
931 | ||
932 | static const struct nfs_pageio_ops filelayout_pg_read_ops = { | |
933 | .pg_init = filelayout_pg_init_read, | |
934 | .pg_test = filelayout_pg_test, | |
935 | .pg_doio = pnfs_generic_pg_readpages, | |
936 | .pg_cleanup = pnfs_generic_pg_cleanup, | |
937 | }; | |
938 | ||
939 | static const struct nfs_pageio_ops filelayout_pg_write_ops = { | |
940 | .pg_init = filelayout_pg_init_write, | |
941 | .pg_test = filelayout_pg_test, | |
942 | .pg_doio = pnfs_generic_pg_writepages, | |
943 | .pg_cleanup = pnfs_generic_pg_cleanup, | |
944 | }; | |
945 | ||
946 | static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) | |
947 | { | |
948 | if (fl->stripe_type == STRIPE_SPARSE) | |
949 | return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); | |
950 | else | |
951 | return j; | |
952 | } | |
953 | ||
954 | static void | |
955 | filelayout_mark_request_commit(struct nfs_page *req, | |
956 | struct pnfs_layout_segment *lseg, | |
957 | struct nfs_commit_info *cinfo) | |
958 | ||
959 | { | |
960 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
961 | u32 i, j; | |
962 | struct list_head *list; | |
963 | struct pnfs_commit_bucket *buckets; | |
964 | ||
965 | if (fl->commit_through_mds) { | |
966 | list = &cinfo->mds->list; | |
967 | spin_lock(cinfo->lock); | |
968 | goto mds_commit; | |
969 | } | |
970 | ||
971 | /* Note that we are calling nfs4_fl_calc_j_index on each page | |
972 | * that ends up being committed to a data server. An attractive | |
973 | * alternative is to add a field to nfs_write_data and nfs_page | |
974 | * to store the value calculated in filelayout_write_pagelist | |
975 | * and just use that here. | |
976 | */ | |
977 | j = nfs4_fl_calc_j_index(lseg, req_offset(req)); | |
978 | i = select_bucket_index(fl, j); | |
979 | spin_lock(cinfo->lock); | |
980 | buckets = cinfo->ds->buckets; | |
981 | list = &buckets[i].written; | |
982 | if (list_empty(list)) { | |
983 | /* Non-empty buckets hold a reference on the lseg. That ref | |
984 | * is normally transferred to the COMMIT call and released | |
985 | * there. It could also be released if the last req is pulled | |
986 | * off due to a rewrite, in which case it will be done in | |
987 | * pnfs_generic_clear_request_commit | |
988 | */ | |
989 | buckets[i].wlseg = pnfs_get_lseg(lseg); | |
990 | } | |
991 | set_bit(PG_COMMIT_TO_DS, &req->wb_flags); | |
992 | cinfo->ds->nwritten++; | |
993 | ||
994 | mds_commit: | |
995 | /* nfs_request_add_commit_list(). We need to add req to list without | |
996 | * dropping cinfo lock. | |
997 | */ | |
998 | set_bit(PG_CLEAN, &(req)->wb_flags); | |
999 | nfs_list_add_request(req, list); | |
1000 | cinfo->mds->ncommit++; | |
1001 | spin_unlock(cinfo->lock); | |
1002 | if (!cinfo->dreq) { | |
1003 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); | |
1004 | inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, | |
1005 | BDI_RECLAIMABLE); | |
1006 | __mark_inode_dirty(req->wb_context->dentry->d_inode, | |
1007 | I_DIRTY_DATASYNC); | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) | |
1012 | { | |
1013 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
1014 | ||
1015 | if (flseg->stripe_type == STRIPE_SPARSE) | |
1016 | return i; | |
1017 | else | |
1018 | return nfs4_fl_calc_ds_index(lseg, i); | |
1019 | } | |
1020 | ||
1021 | static struct nfs_fh * | |
1022 | select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) | |
1023 | { | |
1024 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
1025 | ||
1026 | if (flseg->stripe_type == STRIPE_SPARSE) { | |
1027 | if (flseg->num_fh == 1) | |
1028 | i = 0; | |
1029 | else if (flseg->num_fh == 0) | |
1030 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ | |
1031 | return NULL; | |
1032 | } | |
1033 | return flseg->fh_array[i]; | |
1034 | } | |
1035 | ||
1036 | static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) | |
1037 | { | |
1038 | struct pnfs_layout_segment *lseg = data->lseg; | |
1039 | struct nfs4_pnfs_ds *ds; | |
1040 | struct rpc_clnt *ds_clnt; | |
1041 | u32 idx; | |
1042 | struct nfs_fh *fh; | |
1043 | ||
1044 | idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); | |
1045 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
1046 | if (!ds) | |
1047 | goto out_err; | |
1048 | ||
1049 | ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); | |
1050 | if (IS_ERR(ds_clnt)) | |
1051 | goto out_err; | |
1052 | ||
1053 | dprintk("%s ino %lu, how %d cl_count %d\n", __func__, | |
1054 | data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count)); | |
1055 | data->commit_done_cb = filelayout_commit_done_cb; | |
1056 | atomic_inc(&ds->ds_clp->cl_count); | |
1057 | data->ds_clp = ds->ds_clp; | |
1058 | fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); | |
1059 | if (fh) | |
1060 | data->args.fh = fh; | |
1061 | return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), | |
1062 | &filelayout_commit_call_ops, how, | |
1063 | RPC_TASK_SOFTCONN); | |
1064 | out_err: | |
1065 | pnfs_generic_prepare_to_resend_writes(data); | |
1066 | pnfs_generic_commit_release(data); | |
1067 | return -EAGAIN; | |
1068 | } | |
1069 | ||
1070 | /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest | |
1071 | * for @page | |
1072 | * @cinfo - commit info for current inode | |
1073 | * @page - page to search for matching head request | |
1074 | * | |
1075 | * Returns a the head request if one is found, otherwise returns NULL. | |
1076 | */ | |
1077 | static struct nfs_page * | |
1078 | filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page) | |
1079 | { | |
1080 | struct nfs_page *freq, *t; | |
1081 | struct pnfs_commit_bucket *b; | |
1082 | int i; | |
1083 | ||
1084 | /* Linearly search the commit lists for each bucket until a matching | |
1085 | * request is found */ | |
1086 | for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { | |
1087 | list_for_each_entry_safe(freq, t, &b->written, wb_list) { | |
1088 | if (freq->wb_page == page) | |
1089 | return freq->wb_head; | |
1090 | } | |
1091 | list_for_each_entry_safe(freq, t, &b->committing, wb_list) { | |
1092 | if (freq->wb_page == page) | |
1093 | return freq->wb_head; | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | return NULL; | |
1098 | } | |
1099 | ||
1100 | static int | |
1101 | filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
1102 | int how, struct nfs_commit_info *cinfo) | |
1103 | { | |
1104 | return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, | |
1105 | filelayout_initiate_commit); | |
1106 | } | |
1107 | ||
1108 | static struct nfs4_deviceid_node * | |
1109 | filelayout_alloc_deviceid_node(struct nfs_server *server, | |
1110 | struct pnfs_device *pdev, gfp_t gfp_flags) | |
1111 | { | |
1112 | struct nfs4_file_layout_dsaddr *dsaddr; | |
1113 | ||
1114 | dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); | |
1115 | if (!dsaddr) | |
1116 | return NULL; | |
1117 | return &dsaddr->id_node; | |
1118 | } | |
1119 | ||
1120 | static void | |
1121 | filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d) | |
1122 | { | |
1123 | nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); | |
1124 | } | |
1125 | ||
1126 | static struct pnfs_layout_hdr * | |
1127 | filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) | |
1128 | { | |
1129 | struct nfs4_filelayout *flo; | |
1130 | ||
1131 | flo = kzalloc(sizeof(*flo), gfp_flags); | |
1132 | return flo != NULL ? &flo->generic_hdr : NULL; | |
1133 | } | |
1134 | ||
1135 | static void | |
1136 | filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) | |
1137 | { | |
1138 | kfree(FILELAYOUT_FROM_HDR(lo)); | |
1139 | } | |
1140 | ||
1141 | static struct pnfs_ds_commit_info * | |
1142 | filelayout_get_ds_info(struct inode *inode) | |
1143 | { | |
1144 | struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; | |
1145 | ||
1146 | if (layout == NULL) | |
1147 | return NULL; | |
1148 | else | |
1149 | return &FILELAYOUT_FROM_HDR(layout)->commit_info; | |
1150 | } | |
1151 | ||
1152 | static struct pnfs_layoutdriver_type filelayout_type = { | |
1153 | .id = LAYOUT_NFSV4_1_FILES, | |
1154 | .name = "LAYOUT_NFSV4_1_FILES", | |
1155 | .owner = THIS_MODULE, | |
1156 | .alloc_layout_hdr = filelayout_alloc_layout_hdr, | |
1157 | .free_layout_hdr = filelayout_free_layout_hdr, | |
1158 | .alloc_lseg = filelayout_alloc_lseg, | |
1159 | .free_lseg = filelayout_free_lseg, | |
1160 | .pg_read_ops = &filelayout_pg_read_ops, | |
1161 | .pg_write_ops = &filelayout_pg_write_ops, | |
1162 | .get_ds_info = &filelayout_get_ds_info, | |
1163 | .mark_request_commit = filelayout_mark_request_commit, | |
1164 | .clear_request_commit = pnfs_generic_clear_request_commit, | |
1165 | .scan_commit_lists = pnfs_generic_scan_commit_lists, | |
1166 | .recover_commit_reqs = pnfs_generic_recover_commit_reqs, | |
1167 | .search_commit_reqs = filelayout_search_commit_reqs, | |
1168 | .commit_pagelist = filelayout_commit_pagelist, | |
1169 | .read_pagelist = filelayout_read_pagelist, | |
1170 | .write_pagelist = filelayout_write_pagelist, | |
1171 | .alloc_deviceid_node = filelayout_alloc_deviceid_node, | |
1172 | .free_deviceid_node = filelayout_free_deveiceid_node, | |
1173 | }; | |
1174 | ||
1175 | static int __init nfs4filelayout_init(void) | |
1176 | { | |
1177 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", | |
1178 | __func__); | |
1179 | return pnfs_register_layoutdriver(&filelayout_type); | |
1180 | } | |
1181 | ||
1182 | static void __exit nfs4filelayout_exit(void) | |
1183 | { | |
1184 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", | |
1185 | __func__); | |
1186 | pnfs_unregister_layoutdriver(&filelayout_type); | |
1187 | } | |
1188 | ||
1189 | MODULE_ALIAS("nfs-layouttype4-1"); | |
1190 | ||
1191 | module_init(nfs4filelayout_init); | |
1192 | module_exit(nfs4filelayout_exit); |