Commit | Line | Data |
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7ab672ce DH |
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> | |
16b374ca AA |
33 | |
34 | #include "internal.h" | |
35 | #include "nfs4filelayout.h" | |
7ab672ce DH |
36 | |
37 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
38 | ||
39 | MODULE_LICENSE("GPL"); | |
40 | MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); | |
41 | MODULE_DESCRIPTION("The NFSv4 file layout driver"); | |
42 | ||
cbdabc7f AA |
43 | #define FILELAYOUT_POLL_RETRY_MAX (15*HZ) |
44 | ||
cfe7f412 FI |
45 | static loff_t |
46 | filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, | |
47 | loff_t offset) | |
48 | { | |
49 | u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; | |
50 | u64 tmp; | |
51 | ||
52 | offset -= flseg->pattern_offset; | |
53 | tmp = offset; | |
54 | do_div(tmp, stripe_width); | |
55 | ||
56 | return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit); | |
57 | } | |
58 | ||
59 | /* This function is used by the layout driver to calculate the | |
60 | * offset of the file on the dserver based on whether the | |
61 | * layout type is STRIPE_DENSE or STRIPE_SPARSE | |
62 | */ | |
63 | static loff_t | |
64 | filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) | |
65 | { | |
66 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
67 | ||
68 | switch (flseg->stripe_type) { | |
69 | case STRIPE_SPARSE: | |
70 | return offset; | |
71 | ||
72 | case STRIPE_DENSE: | |
73 | return filelayout_get_dense_offset(flseg, offset); | |
74 | } | |
75 | ||
76 | BUG(); | |
77 | } | |
78 | ||
cbdabc7f AA |
79 | /* For data server errors we don't recover from */ |
80 | static void | |
81 | filelayout_set_lo_fail(struct pnfs_layout_segment *lseg) | |
82 | { | |
83 | if (lseg->pls_range.iomode == IOMODE_RW) { | |
84 | dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__); | |
85 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
86 | } else { | |
87 | dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__); | |
88 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
89 | } | |
90 | } | |
91 | ||
92 | static int filelayout_async_handle_error(struct rpc_task *task, | |
93 | struct nfs4_state *state, | |
94 | struct nfs_client *clp, | |
95 | int *reset) | |
96 | { | |
97 | if (task->tk_status >= 0) | |
98 | return 0; | |
99 | ||
100 | *reset = 0; | |
101 | ||
102 | switch (task->tk_status) { | |
103 | case -NFS4ERR_BADSESSION: | |
104 | case -NFS4ERR_BADSLOT: | |
105 | case -NFS4ERR_BAD_HIGH_SLOT: | |
106 | case -NFS4ERR_DEADSESSION: | |
107 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
108 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
109 | case -NFS4ERR_SEQ_MISORDERED: | |
110 | dprintk("%s ERROR %d, Reset session. Exchangeid " | |
111 | "flags 0x%x\n", __func__, task->tk_status, | |
112 | clp->cl_exchange_flags); | |
113 | nfs4_schedule_session_recovery(clp->cl_session); | |
114 | break; | |
115 | case -NFS4ERR_DELAY: | |
116 | case -NFS4ERR_GRACE: | |
117 | case -EKEYEXPIRED: | |
118 | rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); | |
119 | break; | |
120 | default: | |
121 | dprintk("%s DS error. Retry through MDS %d\n", __func__, | |
122 | task->tk_status); | |
123 | *reset = 1; | |
124 | break; | |
125 | } | |
126 | task->tk_status = 0; | |
127 | return -EAGAIN; | |
128 | } | |
129 | ||
130 | /* NFS_PROTO call done callback routines */ | |
131 | ||
132 | static int filelayout_read_done_cb(struct rpc_task *task, | |
133 | struct nfs_read_data *data) | |
134 | { | |
135 | struct nfs_client *clp = data->ds_clp; | |
136 | int reset = 0; | |
137 | ||
138 | dprintk("%s DS read\n", __func__); | |
139 | ||
140 | if (filelayout_async_handle_error(task, data->args.context->state, | |
141 | data->ds_clp, &reset) == -EAGAIN) { | |
142 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", | |
143 | __func__, data->ds_clp, data->ds_clp->cl_session); | |
144 | if (reset) { | |
145 | filelayout_set_lo_fail(data->lseg); | |
146 | nfs4_reset_read(task, data); | |
147 | clp = NFS_SERVER(data->inode)->nfs_client; | |
148 | } | |
149 | nfs_restart_rpc(task, clp); | |
150 | return -EAGAIN; | |
151 | } | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
863a3c6c AA |
156 | /* |
157 | * We reference the rpc_cred of the first WRITE that triggers the need for | |
158 | * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. | |
159 | * rfc5661 is not clear about which credential should be used. | |
160 | */ | |
161 | static void | |
162 | filelayout_set_layoutcommit(struct nfs_write_data *wdata) | |
163 | { | |
164 | if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds || | |
165 | wdata->res.verf->committed == NFS_FILE_SYNC) | |
166 | return; | |
167 | ||
168 | pnfs_set_layoutcommit(wdata); | |
169 | dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino, | |
170 | (unsigned long) wdata->lseg->pls_end_pos); | |
171 | } | |
172 | ||
dc70d7b3 AA |
173 | /* |
174 | * Call ops for the async read/write cases | |
175 | * In the case of dense layouts, the offset needs to be reset to its | |
176 | * original value. | |
177 | */ | |
178 | static void filelayout_read_prepare(struct rpc_task *task, void *data) | |
179 | { | |
180 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; | |
181 | ||
cbdabc7f AA |
182 | rdata->read_done_cb = filelayout_read_done_cb; |
183 | ||
dc70d7b3 AA |
184 | if (nfs41_setup_sequence(rdata->ds_clp->cl_session, |
185 | &rdata->args.seq_args, &rdata->res.seq_res, | |
186 | 0, task)) | |
187 | return; | |
188 | ||
189 | rpc_call_start(task); | |
190 | } | |
191 | ||
192 | static void filelayout_read_call_done(struct rpc_task *task, void *data) | |
193 | { | |
194 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; | |
195 | ||
196 | dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); | |
197 | ||
198 | /* Note this may cause RPC to be resent */ | |
199 | rdata->mds_ops->rpc_call_done(task, data); | |
200 | } | |
201 | ||
202 | static void filelayout_read_release(void *data) | |
203 | { | |
204 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; | |
205 | ||
206 | rdata->mds_ops->rpc_release(data); | |
207 | } | |
208 | ||
a69aef14 FI |
209 | static int filelayout_write_done_cb(struct rpc_task *task, |
210 | struct nfs_write_data *data) | |
211 | { | |
212 | int reset = 0; | |
213 | ||
214 | if (filelayout_async_handle_error(task, data->args.context->state, | |
215 | data->ds_clp, &reset) == -EAGAIN) { | |
216 | struct nfs_client *clp; | |
217 | ||
218 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", | |
219 | __func__, data->ds_clp, data->ds_clp->cl_session); | |
220 | if (reset) { | |
221 | filelayout_set_lo_fail(data->lseg); | |
222 | nfs4_reset_write(task, data); | |
223 | clp = NFS_SERVER(data->inode)->nfs_client; | |
224 | } else | |
225 | clp = data->ds_clp; | |
226 | nfs_restart_rpc(task, clp); | |
227 | return -EAGAIN; | |
228 | } | |
229 | ||
863a3c6c | 230 | filelayout_set_layoutcommit(data); |
a69aef14 FI |
231 | return 0; |
232 | } | |
233 | ||
e0c2b380 FI |
234 | /* Fake up some data that will cause nfs_commit_release to retry the writes. */ |
235 | static void prepare_to_resend_writes(struct nfs_write_data *data) | |
236 | { | |
237 | struct nfs_page *first = nfs_list_entry(data->pages.next); | |
238 | ||
239 | data->task.tk_status = 0; | |
240 | memcpy(data->verf.verifier, first->wb_verf.verifier, | |
241 | sizeof(first->wb_verf.verifier)); | |
242 | data->verf.verifier[0]++; /* ensure verifier mismatch */ | |
243 | } | |
244 | ||
245 | static int filelayout_commit_done_cb(struct rpc_task *task, | |
246 | struct nfs_write_data *data) | |
247 | { | |
248 | int reset = 0; | |
249 | ||
250 | if (filelayout_async_handle_error(task, data->args.context->state, | |
251 | data->ds_clp, &reset) == -EAGAIN) { | |
252 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", | |
253 | __func__, data->ds_clp, data->ds_clp->cl_session); | |
254 | if (reset) { | |
255 | prepare_to_resend_writes(data); | |
256 | filelayout_set_lo_fail(data->lseg); | |
257 | } else | |
258 | nfs_restart_rpc(task, data->ds_clp); | |
259 | return -EAGAIN; | |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
a69aef14 FI |
265 | static void filelayout_write_prepare(struct rpc_task *task, void *data) |
266 | { | |
267 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
268 | ||
269 | if (nfs41_setup_sequence(wdata->ds_clp->cl_session, | |
270 | &wdata->args.seq_args, &wdata->res.seq_res, | |
271 | 0, task)) | |
272 | return; | |
273 | ||
274 | rpc_call_start(task); | |
275 | } | |
276 | ||
277 | static void filelayout_write_call_done(struct rpc_task *task, void *data) | |
278 | { | |
279 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
280 | ||
281 | /* Note this may cause RPC to be resent */ | |
282 | wdata->mds_ops->rpc_call_done(task, data); | |
283 | } | |
284 | ||
285 | static void filelayout_write_release(void *data) | |
286 | { | |
287 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
288 | ||
289 | wdata->mds_ops->rpc_release(data); | |
290 | } | |
291 | ||
e0c2b380 FI |
292 | static void filelayout_commit_release(void *data) |
293 | { | |
294 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
295 | ||
296 | nfs_commit_release_pages(wdata); | |
297 | if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding)) | |
298 | nfs_commit_clear_lock(NFS_I(wdata->inode)); | |
299 | nfs_commitdata_release(wdata); | |
300 | } | |
301 | ||
dc70d7b3 AA |
302 | struct rpc_call_ops filelayout_read_call_ops = { |
303 | .rpc_call_prepare = filelayout_read_prepare, | |
304 | .rpc_call_done = filelayout_read_call_done, | |
305 | .rpc_release = filelayout_read_release, | |
306 | }; | |
307 | ||
a69aef14 FI |
308 | struct rpc_call_ops filelayout_write_call_ops = { |
309 | .rpc_call_prepare = filelayout_write_prepare, | |
310 | .rpc_call_done = filelayout_write_call_done, | |
311 | .rpc_release = filelayout_write_release, | |
312 | }; | |
313 | ||
e0c2b380 FI |
314 | struct rpc_call_ops filelayout_commit_call_ops = { |
315 | .rpc_call_prepare = filelayout_write_prepare, | |
316 | .rpc_call_done = filelayout_write_call_done, | |
317 | .rpc_release = filelayout_commit_release, | |
318 | }; | |
319 | ||
dc70d7b3 AA |
320 | static enum pnfs_try_status |
321 | filelayout_read_pagelist(struct nfs_read_data *data) | |
322 | { | |
323 | struct pnfs_layout_segment *lseg = data->lseg; | |
324 | struct nfs4_pnfs_ds *ds; | |
325 | loff_t offset = data->args.offset; | |
326 | u32 j, idx; | |
327 | struct nfs_fh *fh; | |
328 | int status; | |
329 | ||
330 | dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", | |
331 | __func__, data->inode->i_ino, | |
332 | data->args.pgbase, (size_t)data->args.count, offset); | |
333 | ||
334 | /* Retrieve the correct rpc_client for the byte range */ | |
335 | j = nfs4_fl_calc_j_index(lseg, offset); | |
336 | idx = nfs4_fl_calc_ds_index(lseg, j); | |
337 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
338 | if (!ds) { | |
568e8c49 AA |
339 | /* Either layout fh index faulty, or ds connect failed */ |
340 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
341 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
dc70d7b3 AA |
342 | return PNFS_NOT_ATTEMPTED; |
343 | } | |
344 | dprintk("%s USE DS:ip %x %hu\n", __func__, | |
345 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); | |
346 | ||
347 | /* No multipath support. Use first DS */ | |
348 | data->ds_clp = ds->ds_clp; | |
349 | fh = nfs4_fl_select_ds_fh(lseg, j); | |
350 | if (fh) | |
351 | data->args.fh = fh; | |
352 | ||
353 | data->args.offset = filelayout_get_dserver_offset(lseg, offset); | |
354 | data->mds_offset = offset; | |
355 | ||
356 | /* Perform an asynchronous read to ds */ | |
357 | status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient, | |
358 | &filelayout_read_call_ops); | |
359 | BUG_ON(status != 0); | |
360 | return PNFS_ATTEMPTED; | |
361 | } | |
362 | ||
a69aef14 | 363 | /* Perform async writes. */ |
0382b744 AA |
364 | static enum pnfs_try_status |
365 | filelayout_write_pagelist(struct nfs_write_data *data, int sync) | |
366 | { | |
a69aef14 FI |
367 | struct pnfs_layout_segment *lseg = data->lseg; |
368 | struct nfs4_pnfs_ds *ds; | |
369 | loff_t offset = data->args.offset; | |
370 | u32 j, idx; | |
371 | struct nfs_fh *fh; | |
372 | int status; | |
373 | ||
374 | /* Retrieve the correct rpc_client for the byte range */ | |
375 | j = nfs4_fl_calc_j_index(lseg, offset); | |
376 | idx = nfs4_fl_calc_ds_index(lseg, j); | |
377 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
378 | if (!ds) { | |
379 | printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); | |
380 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
381 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
382 | return PNFS_NOT_ATTEMPTED; | |
383 | } | |
384 | dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu\n", __func__, | |
385 | data->inode->i_ino, sync, (size_t) data->args.count, offset, | |
386 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); | |
387 | ||
a69aef14 FI |
388 | data->write_done_cb = filelayout_write_done_cb; |
389 | data->ds_clp = ds->ds_clp; | |
390 | fh = nfs4_fl_select_ds_fh(lseg, j); | |
391 | if (fh) | |
392 | data->args.fh = fh; | |
393 | /* | |
394 | * Get the file offset on the dserver. Set the write offset to | |
395 | * this offset and save the original offset. | |
396 | */ | |
397 | data->args.offset = filelayout_get_dserver_offset(lseg, offset); | |
398 | data->mds_offset = offset; | |
399 | ||
400 | /* Perform an asynchronous write */ | |
401 | status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient, | |
402 | &filelayout_write_call_ops, sync); | |
403 | BUG_ON(status != 0); | |
404 | return PNFS_ATTEMPTED; | |
0382b744 AA |
405 | } |
406 | ||
16b374ca AA |
407 | /* |
408 | * filelayout_check_layout() | |
409 | * | |
410 | * Make sure layout segment parameters are sane WRT the device. | |
411 | * At this point no generic layer initialization of the lseg has occurred, | |
412 | * and nothing has been added to the layout_hdr cache. | |
413 | * | |
414 | */ | |
415 | static int | |
416 | filelayout_check_layout(struct pnfs_layout_hdr *lo, | |
417 | struct nfs4_filelayout_segment *fl, | |
418 | struct nfs4_layoutget_res *lgr, | |
419 | struct nfs4_deviceid *id) | |
420 | { | |
421 | struct nfs4_file_layout_dsaddr *dsaddr; | |
422 | int status = -EINVAL; | |
b7edfaa1 | 423 | struct nfs_server *nfss = NFS_SERVER(lo->plh_inode); |
16b374ca AA |
424 | |
425 | dprintk("--> %s\n", __func__); | |
426 | ||
427 | if (fl->pattern_offset > lgr->range.offset) { | |
428 | dprintk("%s pattern_offset %lld to large\n", | |
429 | __func__, fl->pattern_offset); | |
430 | goto out; | |
431 | } | |
432 | ||
75247aff BH |
433 | if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) { |
434 | dprintk("%s Invalid stripe unit (%u)\n", | |
16b374ca AA |
435 | __func__, fl->stripe_unit); |
436 | goto out; | |
437 | } | |
438 | ||
439 | /* find and reference the deviceid */ | |
ea8eecdd | 440 | dsaddr = nfs4_fl_find_get_deviceid(id); |
16b374ca | 441 | if (dsaddr == NULL) { |
b7edfaa1 | 442 | dsaddr = get_device_info(lo->plh_inode, id); |
16b374ca AA |
443 | if (dsaddr == NULL) |
444 | goto out; | |
445 | } | |
446 | fl->dsaddr = dsaddr; | |
447 | ||
448 | if (fl->first_stripe_index < 0 || | |
449 | fl->first_stripe_index >= dsaddr->stripe_count) { | |
450 | dprintk("%s Bad first_stripe_index %d\n", | |
451 | __func__, fl->first_stripe_index); | |
452 | goto out_put; | |
453 | } | |
454 | ||
455 | if ((fl->stripe_type == STRIPE_SPARSE && | |
456 | fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || | |
457 | (fl->stripe_type == STRIPE_DENSE && | |
458 | fl->num_fh != dsaddr->stripe_count)) { | |
459 | dprintk("%s num_fh %u not valid for given packing\n", | |
460 | __func__, fl->num_fh); | |
461 | goto out_put; | |
462 | } | |
463 | ||
464 | if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) { | |
465 | dprintk("%s Stripe unit (%u) not aligned with rsize %u " | |
466 | "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize, | |
467 | nfss->wsize); | |
468 | } | |
469 | ||
470 | status = 0; | |
471 | out: | |
472 | dprintk("--> %s returns %d\n", __func__, status); | |
473 | return status; | |
474 | out_put: | |
ea8eecdd | 475 | nfs4_fl_put_deviceid(dsaddr); |
16b374ca AA |
476 | goto out; |
477 | } | |
478 | ||
479 | static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) | |
480 | { | |
481 | int i; | |
482 | ||
483 | for (i = 0; i < fl->num_fh; i++) { | |
484 | if (!fl->fh_array[i]) | |
485 | break; | |
486 | kfree(fl->fh_array[i]); | |
487 | } | |
488 | kfree(fl->fh_array); | |
489 | fl->fh_array = NULL; | |
490 | } | |
491 | ||
492 | static void | |
493 | _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) | |
494 | { | |
495 | filelayout_free_fh_array(fl); | |
496 | kfree(fl); | |
497 | } | |
498 | ||
499 | static int | |
500 | filelayout_decode_layout(struct pnfs_layout_hdr *flo, | |
501 | struct nfs4_filelayout_segment *fl, | |
502 | struct nfs4_layoutget_res *lgr, | |
503 | struct nfs4_deviceid *id) | |
504 | { | |
35124a09 WAA |
505 | struct xdr_stream stream; |
506 | struct xdr_buf buf = { | |
507 | .pages = lgr->layoutp->pages, | |
508 | .page_len = lgr->layoutp->len, | |
509 | .buflen = lgr->layoutp->len, | |
510 | .len = lgr->layoutp->len, | |
511 | }; | |
512 | struct page *scratch; | |
513 | __be32 *p; | |
16b374ca AA |
514 | uint32_t nfl_util; |
515 | int i; | |
516 | ||
517 | dprintk("%s: set_layout_map Begin\n", __func__); | |
518 | ||
35124a09 WAA |
519 | scratch = alloc_page(GFP_KERNEL); |
520 | if (!scratch) | |
521 | return -ENOMEM; | |
522 | ||
523 | xdr_init_decode(&stream, &buf, NULL); | |
524 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); | |
525 | ||
526 | /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), | |
527 | * num_fh (4) */ | |
528 | p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); | |
529 | if (unlikely(!p)) | |
530 | goto out_err; | |
531 | ||
16b374ca AA |
532 | memcpy(id, p, sizeof(*id)); |
533 | p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); | |
534 | print_deviceid(id); | |
535 | ||
536 | nfl_util = be32_to_cpup(p++); | |
537 | if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) | |
538 | fl->commit_through_mds = 1; | |
539 | if (nfl_util & NFL4_UFLG_DENSE) | |
540 | fl->stripe_type = STRIPE_DENSE; | |
541 | else | |
542 | fl->stripe_type = STRIPE_SPARSE; | |
543 | fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; | |
544 | ||
545 | fl->first_stripe_index = be32_to_cpup(p++); | |
546 | p = xdr_decode_hyper(p, &fl->pattern_offset); | |
547 | fl->num_fh = be32_to_cpup(p++); | |
548 | ||
549 | dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", | |
550 | __func__, nfl_util, fl->num_fh, fl->first_stripe_index, | |
551 | fl->pattern_offset); | |
552 | ||
35124a09 WAA |
553 | if (!fl->num_fh) |
554 | goto out_err; | |
555 | ||
16b374ca AA |
556 | fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *), |
557 | GFP_KERNEL); | |
558 | if (!fl->fh_array) | |
35124a09 | 559 | goto out_err; |
16b374ca AA |
560 | |
561 | for (i = 0; i < fl->num_fh; i++) { | |
562 | /* Do we want to use a mempool here? */ | |
563 | fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL); | |
35124a09 WAA |
564 | if (!fl->fh_array[i]) |
565 | goto out_err_free; | |
566 | ||
567 | p = xdr_inline_decode(&stream, 4); | |
568 | if (unlikely(!p)) | |
569 | goto out_err_free; | |
16b374ca AA |
570 | fl->fh_array[i]->size = be32_to_cpup(p++); |
571 | if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { | |
572 | printk(KERN_ERR "Too big fh %d received %d\n", | |
573 | i, fl->fh_array[i]->size); | |
35124a09 | 574 | goto out_err_free; |
16b374ca | 575 | } |
35124a09 WAA |
576 | |
577 | p = xdr_inline_decode(&stream, fl->fh_array[i]->size); | |
578 | if (unlikely(!p)) | |
579 | goto out_err_free; | |
16b374ca | 580 | memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); |
16b374ca AA |
581 | dprintk("DEBUG: %s: fh len %d\n", __func__, |
582 | fl->fh_array[i]->size); | |
583 | } | |
584 | ||
35124a09 | 585 | __free_page(scratch); |
16b374ca | 586 | return 0; |
35124a09 WAA |
587 | |
588 | out_err_free: | |
589 | filelayout_free_fh_array(fl); | |
590 | out_err: | |
591 | __free_page(scratch); | |
592 | return -EIO; | |
16b374ca AA |
593 | } |
594 | ||
c879513e FI |
595 | static void |
596 | filelayout_free_lseg(struct pnfs_layout_segment *lseg) | |
597 | { | |
598 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
599 | ||
600 | dprintk("--> %s\n", __func__); | |
601 | nfs4_fl_put_deviceid(fl->dsaddr); | |
425eb736 | 602 | kfree(fl->commit_buckets); |
c879513e FI |
603 | _filelayout_free_lseg(fl); |
604 | } | |
605 | ||
16b374ca AA |
606 | static struct pnfs_layout_segment * |
607 | filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, | |
608 | struct nfs4_layoutget_res *lgr) | |
609 | { | |
610 | struct nfs4_filelayout_segment *fl; | |
611 | int rc; | |
612 | struct nfs4_deviceid id; | |
613 | ||
614 | dprintk("--> %s\n", __func__); | |
615 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); | |
616 | if (!fl) | |
617 | return NULL; | |
618 | ||
619 | rc = filelayout_decode_layout(layoutid, fl, lgr, &id); | |
620 | if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) { | |
621 | _filelayout_free_lseg(fl); | |
622 | return NULL; | |
623 | } | |
425eb736 FI |
624 | |
625 | /* This assumes there is only one IOMODE_RW lseg. What | |
626 | * we really want to do is have a layout_hdr level | |
627 | * dictionary of <multipath_list4, fh> keys, each | |
628 | * associated with a struct list_head, populated by calls | |
629 | * to filelayout_write_pagelist(). | |
630 | * */ | |
631 | if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) { | |
632 | int i; | |
633 | int size = (fl->stripe_type == STRIPE_SPARSE) ? | |
634 | fl->dsaddr->ds_num : fl->dsaddr->stripe_count; | |
635 | ||
636 | fl->commit_buckets = kcalloc(size, sizeof(struct list_head), GFP_KERNEL); | |
637 | if (!fl->commit_buckets) { | |
638 | filelayout_free_lseg(&fl->generic_hdr); | |
639 | return NULL; | |
640 | } | |
641 | fl->number_of_buckets = size; | |
642 | for (i = 0; i < size; i++) | |
643 | INIT_LIST_HEAD(&fl->commit_buckets[i]); | |
644 | } | |
16b374ca AA |
645 | return &fl->generic_hdr; |
646 | } | |
647 | ||
94ad1c80 FI |
648 | /* |
649 | * filelayout_pg_test(). Called by nfs_can_coalesce_requests() | |
650 | * | |
651 | * return 1 : coalesce page | |
652 | * return 0 : don't coalesce page | |
653 | */ | |
654 | int | |
655 | filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, | |
656 | struct nfs_page *req) | |
657 | { | |
658 | u64 p_stripe, r_stripe; | |
659 | u32 stripe_unit; | |
660 | ||
661 | if (!pgio->pg_lseg) | |
662 | return 1; | |
663 | p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT; | |
664 | r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT; | |
665 | stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; | |
666 | ||
667 | do_div(p_stripe, stripe_unit); | |
668 | do_div(r_stripe, stripe_unit); | |
669 | ||
670 | return (p_stripe == r_stripe); | |
671 | } | |
672 | ||
e0c2b380 FI |
673 | static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg) |
674 | { | |
675 | return !FILELAYOUT_LSEG(lseg)->commit_through_mds; | |
676 | } | |
677 | ||
678 | static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) | |
679 | { | |
680 | if (fl->stripe_type == STRIPE_SPARSE) | |
681 | return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); | |
682 | else | |
683 | return j; | |
684 | } | |
685 | ||
686 | struct list_head *filelayout_choose_commit_list(struct nfs_page *req) | |
687 | { | |
688 | struct pnfs_layout_segment *lseg = req->wb_commit_lseg; | |
689 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
690 | u32 i, j; | |
691 | struct list_head *list; | |
692 | ||
693 | /* Note that we are calling nfs4_fl_calc_j_index on each page | |
694 | * that ends up being committed to a data server. An attractive | |
695 | * alternative is to add a field to nfs_write_data and nfs_page | |
696 | * to store the value calculated in filelayout_write_pagelist | |
697 | * and just use that here. | |
698 | */ | |
699 | j = nfs4_fl_calc_j_index(lseg, | |
700 | (loff_t)req->wb_index << PAGE_CACHE_SHIFT); | |
701 | i = select_bucket_index(fl, j); | |
702 | list = &fl->commit_buckets[i]; | |
703 | if (list_empty(list)) { | |
704 | /* Non-empty buckets hold a reference on the lseg */ | |
705 | get_lseg(lseg); | |
706 | } | |
707 | return list; | |
708 | } | |
709 | ||
710 | static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) | |
711 | { | |
712 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
713 | ||
714 | if (flseg->stripe_type == STRIPE_SPARSE) | |
715 | return i; | |
716 | else | |
717 | return nfs4_fl_calc_ds_index(lseg, i); | |
718 | } | |
719 | ||
720 | static struct nfs_fh * | |
721 | select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) | |
722 | { | |
723 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
724 | ||
725 | if (flseg->stripe_type == STRIPE_SPARSE) { | |
726 | if (flseg->num_fh == 1) | |
727 | i = 0; | |
728 | else if (flseg->num_fh == 0) | |
729 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ | |
730 | return NULL; | |
731 | } | |
732 | return flseg->fh_array[i]; | |
733 | } | |
734 | ||
735 | static int filelayout_initiate_commit(struct nfs_write_data *data, int how) | |
736 | { | |
737 | struct pnfs_layout_segment *lseg = data->lseg; | |
738 | struct nfs4_pnfs_ds *ds; | |
739 | u32 idx; | |
740 | struct nfs_fh *fh; | |
741 | ||
742 | idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); | |
743 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
744 | if (!ds) { | |
745 | printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); | |
746 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
747 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
748 | prepare_to_resend_writes(data); | |
749 | data->mds_ops->rpc_release(data); | |
750 | return -EAGAIN; | |
751 | } | |
752 | dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how); | |
753 | data->write_done_cb = filelayout_commit_done_cb; | |
754 | data->ds_clp = ds->ds_clp; | |
755 | fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); | |
756 | if (fh) | |
757 | data->args.fh = fh; | |
758 | return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient, | |
759 | &filelayout_commit_call_ops, how); | |
760 | } | |
761 | ||
762 | /* | |
763 | * This is only useful while we are using whole file layouts. | |
764 | */ | |
765 | static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode) | |
766 | { | |
767 | struct pnfs_layout_segment *lseg, *rv = NULL; | |
768 | ||
769 | spin_lock(&inode->i_lock); | |
770 | list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) | |
771 | if (lseg->pls_range.iomode == IOMODE_RW) | |
772 | rv = get_lseg(lseg); | |
773 | spin_unlock(&inode->i_lock); | |
774 | return rv; | |
775 | } | |
776 | ||
777 | static int alloc_ds_commits(struct inode *inode, struct list_head *list) | |
778 | { | |
779 | struct pnfs_layout_segment *lseg; | |
780 | struct nfs4_filelayout_segment *fl; | |
781 | struct nfs_write_data *data; | |
782 | int i, j; | |
783 | ||
784 | /* Won't need this when non-whole file layout segments are supported | |
785 | * instead we will use a pnfs_layout_hdr structure */ | |
786 | lseg = find_only_write_lseg(inode); | |
787 | if (!lseg) | |
788 | return 0; | |
789 | fl = FILELAYOUT_LSEG(lseg); | |
790 | for (i = 0; i < fl->number_of_buckets; i++) { | |
791 | if (list_empty(&fl->commit_buckets[i])) | |
792 | continue; | |
793 | data = nfs_commitdata_alloc(); | |
794 | if (!data) | |
795 | goto out_bad; | |
796 | data->ds_commit_index = i; | |
797 | data->lseg = lseg; | |
798 | list_add(&data->pages, list); | |
799 | } | |
800 | put_lseg(lseg); | |
801 | return 0; | |
802 | ||
803 | out_bad: | |
804 | for (j = i; j < fl->number_of_buckets; j++) { | |
805 | if (list_empty(&fl->commit_buckets[i])) | |
806 | continue; | |
807 | nfs_retry_commit(&fl->commit_buckets[i], lseg); | |
808 | put_lseg(lseg); /* associated with emptying bucket */ | |
809 | } | |
810 | put_lseg(lseg); | |
811 | /* Caller will clean up entries put on list */ | |
812 | return -ENOMEM; | |
813 | } | |
814 | ||
815 | /* This follows nfs_commit_list pretty closely */ | |
816 | static int | |
817 | filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
818 | int how) | |
819 | { | |
820 | struct nfs_write_data *data, *tmp; | |
821 | LIST_HEAD(list); | |
822 | ||
823 | if (!list_empty(mds_pages)) { | |
824 | data = nfs_commitdata_alloc(); | |
825 | if (!data) | |
826 | goto out_bad; | |
827 | data->lseg = NULL; | |
828 | list_add(&data->pages, &list); | |
829 | } | |
830 | ||
831 | if (alloc_ds_commits(inode, &list)) | |
832 | goto out_bad; | |
833 | ||
834 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
835 | list_del_init(&data->pages); | |
836 | atomic_inc(&NFS_I(inode)->commits_outstanding); | |
837 | if (!data->lseg) { | |
838 | nfs_init_commit(data, mds_pages, NULL); | |
839 | nfs_initiate_commit(data, NFS_CLIENT(inode), | |
840 | data->mds_ops, how); | |
841 | } else { | |
842 | nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg); | |
843 | filelayout_initiate_commit(data, how); | |
844 | } | |
845 | } | |
846 | return 0; | |
847 | out_bad: | |
848 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
849 | nfs_retry_commit(&data->pages, data->lseg); | |
850 | list_del_init(&data->pages); | |
851 | nfs_commit_free(data); | |
852 | } | |
853 | nfs_retry_commit(mds_pages, NULL); | |
854 | nfs_commit_clear_lock(NFS_I(inode)); | |
855 | return -ENOMEM; | |
856 | } | |
857 | ||
7ab672ce | 858 | static struct pnfs_layoutdriver_type filelayout_type = { |
ea8eecdd CH |
859 | .id = LAYOUT_NFSV4_1_FILES, |
860 | .name = "LAYOUT_NFSV4_1_FILES", | |
861 | .owner = THIS_MODULE, | |
862 | .alloc_lseg = filelayout_alloc_lseg, | |
863 | .free_lseg = filelayout_free_lseg, | |
94ad1c80 | 864 | .pg_test = filelayout_pg_test, |
e0c2b380 FI |
865 | .mark_pnfs_commit = filelayout_mark_pnfs_commit, |
866 | .choose_commit_list = filelayout_choose_commit_list, | |
867 | .commit_pagelist = filelayout_commit_pagelist, | |
dc70d7b3 | 868 | .read_pagelist = filelayout_read_pagelist, |
0382b744 | 869 | .write_pagelist = filelayout_write_pagelist, |
7ab672ce DH |
870 | }; |
871 | ||
872 | static int __init nfs4filelayout_init(void) | |
873 | { | |
874 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", | |
875 | __func__); | |
876 | return pnfs_register_layoutdriver(&filelayout_type); | |
877 | } | |
878 | ||
879 | static void __exit nfs4filelayout_exit(void) | |
880 | { | |
881 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", | |
882 | __func__); | |
883 | pnfs_unregister_layoutdriver(&filelayout_type); | |
884 | } | |
885 | ||
886 | module_init(nfs4filelayout_init); | |
887 | module_exit(nfs4filelayout_exit); |