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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> | |
19345cb2 | 33 | #include <linux/nfs_page.h> |
16b374ca AA |
34 | |
35 | #include "internal.h" | |
36 | #include "nfs4filelayout.h" | |
7ab672ce DH |
37 | |
38 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD | |
39 | ||
40 | MODULE_LICENSE("GPL"); | |
41 | MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); | |
42 | MODULE_DESCRIPTION("The NFSv4 file layout driver"); | |
43 | ||
cbdabc7f AA |
44 | #define FILELAYOUT_POLL_RETRY_MAX (15*HZ) |
45 | ||
cfe7f412 FI |
46 | static loff_t |
47 | filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, | |
48 | loff_t offset) | |
49 | { | |
50 | u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; | |
51 | u64 tmp; | |
52 | ||
53 | offset -= flseg->pattern_offset; | |
54 | tmp = offset; | |
55 | do_div(tmp, stripe_width); | |
56 | ||
57 | return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit); | |
58 | } | |
59 | ||
60 | /* This function is used by the layout driver to calculate the | |
61 | * offset of the file on the dserver based on whether the | |
62 | * layout type is STRIPE_DENSE or STRIPE_SPARSE | |
63 | */ | |
64 | static loff_t | |
65 | filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) | |
66 | { | |
67 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
68 | ||
69 | switch (flseg->stripe_type) { | |
70 | case STRIPE_SPARSE: | |
71 | return offset; | |
72 | ||
73 | case STRIPE_DENSE: | |
74 | return filelayout_get_dense_offset(flseg, offset); | |
75 | } | |
76 | ||
77 | BUG(); | |
78 | } | |
79 | ||
cbdabc7f AA |
80 | /* For data server errors we don't recover from */ |
81 | static void | |
82 | filelayout_set_lo_fail(struct pnfs_layout_segment *lseg) | |
83 | { | |
84 | if (lseg->pls_range.iomode == IOMODE_RW) { | |
85 | dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__); | |
86 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
87 | } else { | |
88 | dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__); | |
89 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
90 | } | |
91 | } | |
92 | ||
93 | static int filelayout_async_handle_error(struct rpc_task *task, | |
94 | struct nfs4_state *state, | |
95 | struct nfs_client *clp, | |
96 | int *reset) | |
97 | { | |
98 | if (task->tk_status >= 0) | |
99 | return 0; | |
100 | ||
101 | *reset = 0; | |
102 | ||
103 | switch (task->tk_status) { | |
104 | case -NFS4ERR_BADSESSION: | |
105 | case -NFS4ERR_BADSLOT: | |
106 | case -NFS4ERR_BAD_HIGH_SLOT: | |
107 | case -NFS4ERR_DEADSESSION: | |
108 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
109 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
110 | case -NFS4ERR_SEQ_MISORDERED: | |
111 | dprintk("%s ERROR %d, Reset session. Exchangeid " | |
112 | "flags 0x%x\n", __func__, task->tk_status, | |
113 | clp->cl_exchange_flags); | |
114 | nfs4_schedule_session_recovery(clp->cl_session); | |
115 | break; | |
116 | case -NFS4ERR_DELAY: | |
117 | case -NFS4ERR_GRACE: | |
118 | case -EKEYEXPIRED: | |
119 | rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); | |
120 | break; | |
a8a4ae3a AA |
121 | case -NFS4ERR_RETRY_UNCACHED_REP: |
122 | break; | |
cbdabc7f AA |
123 | default: |
124 | dprintk("%s DS error. Retry through MDS %d\n", __func__, | |
125 | task->tk_status); | |
126 | *reset = 1; | |
127 | break; | |
128 | } | |
129 | task->tk_status = 0; | |
130 | return -EAGAIN; | |
131 | } | |
132 | ||
133 | /* NFS_PROTO call done callback routines */ | |
134 | ||
135 | static int filelayout_read_done_cb(struct rpc_task *task, | |
136 | struct nfs_read_data *data) | |
137 | { | |
138 | struct nfs_client *clp = data->ds_clp; | |
139 | int reset = 0; | |
140 | ||
141 | dprintk("%s DS read\n", __func__); | |
142 | ||
143 | if (filelayout_async_handle_error(task, data->args.context->state, | |
144 | data->ds_clp, &reset) == -EAGAIN) { | |
145 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", | |
146 | __func__, data->ds_clp, data->ds_clp->cl_session); | |
147 | if (reset) { | |
148 | filelayout_set_lo_fail(data->lseg); | |
149 | nfs4_reset_read(task, data); | |
150 | clp = NFS_SERVER(data->inode)->nfs_client; | |
151 | } | |
152 | nfs_restart_rpc(task, clp); | |
153 | return -EAGAIN; | |
154 | } | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
863a3c6c AA |
159 | /* |
160 | * We reference the rpc_cred of the first WRITE that triggers the need for | |
161 | * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. | |
162 | * rfc5661 is not clear about which credential should be used. | |
163 | */ | |
164 | static void | |
165 | filelayout_set_layoutcommit(struct nfs_write_data *wdata) | |
166 | { | |
167 | if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds || | |
168 | wdata->res.verf->committed == NFS_FILE_SYNC) | |
169 | return; | |
170 | ||
171 | pnfs_set_layoutcommit(wdata); | |
172 | dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino, | |
173 | (unsigned long) wdata->lseg->pls_end_pos); | |
174 | } | |
175 | ||
dc70d7b3 AA |
176 | /* |
177 | * Call ops for the async read/write cases | |
178 | * In the case of dense layouts, the offset needs to be reset to its | |
179 | * original value. | |
180 | */ | |
181 | static void filelayout_read_prepare(struct rpc_task *task, void *data) | |
182 | { | |
183 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; | |
184 | ||
cbdabc7f AA |
185 | rdata->read_done_cb = filelayout_read_done_cb; |
186 | ||
dc70d7b3 AA |
187 | if (nfs41_setup_sequence(rdata->ds_clp->cl_session, |
188 | &rdata->args.seq_args, &rdata->res.seq_res, | |
189 | 0, task)) | |
190 | return; | |
191 | ||
192 | rpc_call_start(task); | |
193 | } | |
194 | ||
195 | static void filelayout_read_call_done(struct rpc_task *task, void *data) | |
196 | { | |
197 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; | |
198 | ||
199 | dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status); | |
200 | ||
201 | /* Note this may cause RPC to be resent */ | |
202 | rdata->mds_ops->rpc_call_done(task, data); | |
203 | } | |
204 | ||
205 | static void filelayout_read_release(void *data) | |
206 | { | |
207 | struct nfs_read_data *rdata = (struct nfs_read_data *)data; | |
208 | ||
209 | rdata->mds_ops->rpc_release(data); | |
210 | } | |
211 | ||
a69aef14 FI |
212 | static int filelayout_write_done_cb(struct rpc_task *task, |
213 | struct nfs_write_data *data) | |
214 | { | |
215 | int reset = 0; | |
216 | ||
217 | if (filelayout_async_handle_error(task, data->args.context->state, | |
218 | data->ds_clp, &reset) == -EAGAIN) { | |
219 | struct nfs_client *clp; | |
220 | ||
221 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", | |
222 | __func__, data->ds_clp, data->ds_clp->cl_session); | |
223 | if (reset) { | |
224 | filelayout_set_lo_fail(data->lseg); | |
225 | nfs4_reset_write(task, data); | |
226 | clp = NFS_SERVER(data->inode)->nfs_client; | |
227 | } else | |
228 | clp = data->ds_clp; | |
229 | nfs_restart_rpc(task, clp); | |
230 | return -EAGAIN; | |
231 | } | |
232 | ||
863a3c6c | 233 | filelayout_set_layoutcommit(data); |
a69aef14 FI |
234 | return 0; |
235 | } | |
236 | ||
e0c2b380 FI |
237 | /* Fake up some data that will cause nfs_commit_release to retry the writes. */ |
238 | static void prepare_to_resend_writes(struct nfs_write_data *data) | |
239 | { | |
240 | struct nfs_page *first = nfs_list_entry(data->pages.next); | |
241 | ||
242 | data->task.tk_status = 0; | |
243 | memcpy(data->verf.verifier, first->wb_verf.verifier, | |
244 | sizeof(first->wb_verf.verifier)); | |
245 | data->verf.verifier[0]++; /* ensure verifier mismatch */ | |
246 | } | |
247 | ||
248 | static int filelayout_commit_done_cb(struct rpc_task *task, | |
249 | struct nfs_write_data *data) | |
250 | { | |
251 | int reset = 0; | |
252 | ||
253 | if (filelayout_async_handle_error(task, data->args.context->state, | |
254 | data->ds_clp, &reset) == -EAGAIN) { | |
255 | dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n", | |
256 | __func__, data->ds_clp, data->ds_clp->cl_session); | |
257 | if (reset) { | |
258 | prepare_to_resend_writes(data); | |
259 | filelayout_set_lo_fail(data->lseg); | |
260 | } else | |
261 | nfs_restart_rpc(task, data->ds_clp); | |
262 | return -EAGAIN; | |
263 | } | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
a69aef14 FI |
268 | static void filelayout_write_prepare(struct rpc_task *task, void *data) |
269 | { | |
270 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
271 | ||
272 | if (nfs41_setup_sequence(wdata->ds_clp->cl_session, | |
273 | &wdata->args.seq_args, &wdata->res.seq_res, | |
274 | 0, task)) | |
275 | return; | |
276 | ||
277 | rpc_call_start(task); | |
278 | } | |
279 | ||
280 | static void filelayout_write_call_done(struct rpc_task *task, void *data) | |
281 | { | |
282 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
283 | ||
284 | /* Note this may cause RPC to be resent */ | |
285 | wdata->mds_ops->rpc_call_done(task, data); | |
286 | } | |
287 | ||
288 | static void filelayout_write_release(void *data) | |
289 | { | |
290 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
291 | ||
292 | wdata->mds_ops->rpc_release(data); | |
293 | } | |
294 | ||
e0c2b380 FI |
295 | static void filelayout_commit_release(void *data) |
296 | { | |
297 | struct nfs_write_data *wdata = (struct nfs_write_data *)data; | |
298 | ||
299 | nfs_commit_release_pages(wdata); | |
300 | if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding)) | |
301 | nfs_commit_clear_lock(NFS_I(wdata->inode)); | |
302 | nfs_commitdata_release(wdata); | |
303 | } | |
304 | ||
dc70d7b3 AA |
305 | struct rpc_call_ops filelayout_read_call_ops = { |
306 | .rpc_call_prepare = filelayout_read_prepare, | |
307 | .rpc_call_done = filelayout_read_call_done, | |
308 | .rpc_release = filelayout_read_release, | |
309 | }; | |
310 | ||
a69aef14 FI |
311 | struct rpc_call_ops filelayout_write_call_ops = { |
312 | .rpc_call_prepare = filelayout_write_prepare, | |
313 | .rpc_call_done = filelayout_write_call_done, | |
314 | .rpc_release = filelayout_write_release, | |
315 | }; | |
316 | ||
e0c2b380 FI |
317 | struct rpc_call_ops filelayout_commit_call_ops = { |
318 | .rpc_call_prepare = filelayout_write_prepare, | |
319 | .rpc_call_done = filelayout_write_call_done, | |
320 | .rpc_release = filelayout_commit_release, | |
321 | }; | |
322 | ||
dc70d7b3 AA |
323 | static enum pnfs_try_status |
324 | filelayout_read_pagelist(struct nfs_read_data *data) | |
325 | { | |
326 | struct pnfs_layout_segment *lseg = data->lseg; | |
327 | struct nfs4_pnfs_ds *ds; | |
328 | loff_t offset = data->args.offset; | |
329 | u32 j, idx; | |
330 | struct nfs_fh *fh; | |
331 | int status; | |
332 | ||
333 | dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n", | |
334 | __func__, data->inode->i_ino, | |
335 | data->args.pgbase, (size_t)data->args.count, offset); | |
336 | ||
337 | /* Retrieve the correct rpc_client for the byte range */ | |
338 | j = nfs4_fl_calc_j_index(lseg, offset); | |
339 | idx = nfs4_fl_calc_ds_index(lseg, j); | |
340 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
341 | if (!ds) { | |
568e8c49 AA |
342 | /* Either layout fh index faulty, or ds connect failed */ |
343 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
344 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
dc70d7b3 AA |
345 | return PNFS_NOT_ATTEMPTED; |
346 | } | |
c9895cb6 | 347 | dprintk("%s USE DS: %s\n", __func__, ds->ds_remotestr); |
dc70d7b3 AA |
348 | |
349 | /* No multipath support. Use first DS */ | |
350 | data->ds_clp = ds->ds_clp; | |
351 | fh = nfs4_fl_select_ds_fh(lseg, j); | |
352 | if (fh) | |
353 | data->args.fh = fh; | |
354 | ||
355 | data->args.offset = filelayout_get_dserver_offset(lseg, offset); | |
356 | data->mds_offset = offset; | |
357 | ||
358 | /* Perform an asynchronous read to ds */ | |
359 | status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient, | |
360 | &filelayout_read_call_ops); | |
361 | BUG_ON(status != 0); | |
362 | return PNFS_ATTEMPTED; | |
363 | } | |
364 | ||
a69aef14 | 365 | /* Perform async writes. */ |
0382b744 AA |
366 | static enum pnfs_try_status |
367 | filelayout_write_pagelist(struct nfs_write_data *data, int sync) | |
368 | { | |
a69aef14 FI |
369 | struct pnfs_layout_segment *lseg = data->lseg; |
370 | struct nfs4_pnfs_ds *ds; | |
371 | loff_t offset = data->args.offset; | |
372 | u32 j, idx; | |
373 | struct nfs_fh *fh; | |
374 | int status; | |
375 | ||
376 | /* Retrieve the correct rpc_client for the byte range */ | |
377 | j = nfs4_fl_calc_j_index(lseg, offset); | |
378 | idx = nfs4_fl_calc_ds_index(lseg, j); | |
379 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
380 | if (!ds) { | |
381 | printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); | |
382 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
383 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
384 | return PNFS_NOT_ATTEMPTED; | |
385 | } | |
c9895cb6 | 386 | dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__, |
a69aef14 | 387 | data->inode->i_ino, sync, (size_t) data->args.count, offset, |
c9895cb6 | 388 | ds->ds_remotestr); |
a69aef14 | 389 | |
a69aef14 FI |
390 | data->write_done_cb = filelayout_write_done_cb; |
391 | data->ds_clp = ds->ds_clp; | |
392 | fh = nfs4_fl_select_ds_fh(lseg, j); | |
393 | if (fh) | |
394 | data->args.fh = fh; | |
395 | /* | |
396 | * Get the file offset on the dserver. Set the write offset to | |
397 | * this offset and save the original offset. | |
398 | */ | |
399 | data->args.offset = filelayout_get_dserver_offset(lseg, offset); | |
a69aef14 FI |
400 | |
401 | /* Perform an asynchronous write */ | |
402 | status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient, | |
403 | &filelayout_write_call_ops, sync); | |
404 | BUG_ON(status != 0); | |
405 | return PNFS_ATTEMPTED; | |
0382b744 AA |
406 | } |
407 | ||
16b374ca AA |
408 | /* |
409 | * filelayout_check_layout() | |
410 | * | |
411 | * Make sure layout segment parameters are sane WRT the device. | |
412 | * At this point no generic layer initialization of the lseg has occurred, | |
413 | * and nothing has been added to the layout_hdr cache. | |
414 | * | |
415 | */ | |
416 | static int | |
417 | filelayout_check_layout(struct pnfs_layout_hdr *lo, | |
418 | struct nfs4_filelayout_segment *fl, | |
419 | struct nfs4_layoutget_res *lgr, | |
a75b9df9 TM |
420 | struct nfs4_deviceid *id, |
421 | gfp_t gfp_flags) | |
16b374ca | 422 | { |
a1eaecbc | 423 | struct nfs4_deviceid_node *d; |
16b374ca AA |
424 | struct nfs4_file_layout_dsaddr *dsaddr; |
425 | int status = -EINVAL; | |
b7edfaa1 | 426 | struct nfs_server *nfss = NFS_SERVER(lo->plh_inode); |
16b374ca AA |
427 | |
428 | dprintk("--> %s\n", __func__); | |
429 | ||
7c24d948 AA |
430 | /* FIXME: remove this check when layout segment support is added */ |
431 | if (lgr->range.offset != 0 || | |
432 | lgr->range.length != NFS4_MAX_UINT64) { | |
433 | dprintk("%s Only whole file layouts supported. Use MDS i/o\n", | |
434 | __func__); | |
435 | goto out; | |
436 | } | |
437 | ||
16b374ca | 438 | if (fl->pattern_offset > lgr->range.offset) { |
3b6445a6 | 439 | dprintk("%s pattern_offset %lld too large\n", |
16b374ca AA |
440 | __func__, fl->pattern_offset); |
441 | goto out; | |
442 | } | |
443 | ||
75247aff BH |
444 | if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) { |
445 | dprintk("%s Invalid stripe unit (%u)\n", | |
16b374ca AA |
446 | __func__, fl->stripe_unit); |
447 | goto out; | |
448 | } | |
449 | ||
450 | /* find and reference the deviceid */ | |
35c8bb54 BH |
451 | d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld, |
452 | NFS_SERVER(lo->plh_inode)->nfs_client, id); | |
a1eaecbc | 453 | if (d == NULL) { |
a75b9df9 | 454 | dsaddr = get_device_info(lo->plh_inode, id, gfp_flags); |
16b374ca AA |
455 | if (dsaddr == NULL) |
456 | goto out; | |
a1eaecbc BH |
457 | } else |
458 | dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); | |
16b374ca AA |
459 | fl->dsaddr = dsaddr; |
460 | ||
461 | if (fl->first_stripe_index < 0 || | |
462 | fl->first_stripe_index >= dsaddr->stripe_count) { | |
463 | dprintk("%s Bad first_stripe_index %d\n", | |
464 | __func__, fl->first_stripe_index); | |
465 | goto out_put; | |
466 | } | |
467 | ||
468 | if ((fl->stripe_type == STRIPE_SPARSE && | |
469 | fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || | |
470 | (fl->stripe_type == STRIPE_DENSE && | |
471 | fl->num_fh != dsaddr->stripe_count)) { | |
472 | dprintk("%s num_fh %u not valid for given packing\n", | |
473 | __func__, fl->num_fh); | |
474 | goto out_put; | |
475 | } | |
476 | ||
477 | if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) { | |
478 | dprintk("%s Stripe unit (%u) not aligned with rsize %u " | |
479 | "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize, | |
480 | nfss->wsize); | |
481 | } | |
482 | ||
483 | status = 0; | |
484 | out: | |
485 | dprintk("--> %s returns %d\n", __func__, status); | |
486 | return status; | |
487 | out_put: | |
ea8eecdd | 488 | nfs4_fl_put_deviceid(dsaddr); |
16b374ca AA |
489 | goto out; |
490 | } | |
491 | ||
492 | static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl) | |
493 | { | |
494 | int i; | |
495 | ||
496 | for (i = 0; i < fl->num_fh; i++) { | |
497 | if (!fl->fh_array[i]) | |
498 | break; | |
499 | kfree(fl->fh_array[i]); | |
500 | } | |
501 | kfree(fl->fh_array); | |
502 | fl->fh_array = NULL; | |
503 | } | |
504 | ||
505 | static void | |
506 | _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) | |
507 | { | |
508 | filelayout_free_fh_array(fl); | |
509 | kfree(fl); | |
510 | } | |
511 | ||
512 | static int | |
513 | filelayout_decode_layout(struct pnfs_layout_hdr *flo, | |
514 | struct nfs4_filelayout_segment *fl, | |
515 | struct nfs4_layoutget_res *lgr, | |
a75b9df9 TM |
516 | struct nfs4_deviceid *id, |
517 | gfp_t gfp_flags) | |
16b374ca | 518 | { |
35124a09 | 519 | struct xdr_stream stream; |
f7da7a12 | 520 | struct xdr_buf buf; |
35124a09 WAA |
521 | struct page *scratch; |
522 | __be32 *p; | |
16b374ca AA |
523 | uint32_t nfl_util; |
524 | int i; | |
525 | ||
526 | dprintk("%s: set_layout_map Begin\n", __func__); | |
527 | ||
a75b9df9 | 528 | scratch = alloc_page(gfp_flags); |
35124a09 WAA |
529 | if (!scratch) |
530 | return -ENOMEM; | |
531 | ||
f7da7a12 | 532 | xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); |
35124a09 WAA |
533 | xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); |
534 | ||
535 | /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), | |
536 | * num_fh (4) */ | |
537 | p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); | |
538 | if (unlikely(!p)) | |
539 | goto out_err; | |
540 | ||
16b374ca AA |
541 | memcpy(id, p, sizeof(*id)); |
542 | p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); | |
a1eaecbc | 543 | nfs4_print_deviceid(id); |
16b374ca AA |
544 | |
545 | nfl_util = be32_to_cpup(p++); | |
546 | if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) | |
547 | fl->commit_through_mds = 1; | |
548 | if (nfl_util & NFL4_UFLG_DENSE) | |
549 | fl->stripe_type = STRIPE_DENSE; | |
550 | else | |
551 | fl->stripe_type = STRIPE_SPARSE; | |
552 | fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; | |
553 | ||
554 | fl->first_stripe_index = be32_to_cpup(p++); | |
555 | p = xdr_decode_hyper(p, &fl->pattern_offset); | |
556 | fl->num_fh = be32_to_cpup(p++); | |
557 | ||
558 | dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", | |
559 | __func__, nfl_util, fl->num_fh, fl->first_stripe_index, | |
560 | fl->pattern_offset); | |
561 | ||
cec765cf AA |
562 | /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. |
563 | * Futher checking is done in filelayout_check_layout */ | |
564 | if (fl->num_fh < 0 || fl->num_fh > | |
565 | max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) | |
35124a09 WAA |
566 | goto out_err; |
567 | ||
cec765cf AA |
568 | if (fl->num_fh > 0) { |
569 | fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *), | |
570 | gfp_flags); | |
571 | if (!fl->fh_array) | |
572 | goto out_err; | |
573 | } | |
16b374ca AA |
574 | |
575 | for (i = 0; i < fl->num_fh; i++) { | |
576 | /* Do we want to use a mempool here? */ | |
a75b9df9 | 577 | fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); |
35124a09 WAA |
578 | if (!fl->fh_array[i]) |
579 | goto out_err_free; | |
580 | ||
581 | p = xdr_inline_decode(&stream, 4); | |
582 | if (unlikely(!p)) | |
583 | goto out_err_free; | |
16b374ca AA |
584 | fl->fh_array[i]->size = be32_to_cpup(p++); |
585 | if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) { | |
586 | printk(KERN_ERR "Too big fh %d received %d\n", | |
587 | i, fl->fh_array[i]->size); | |
35124a09 | 588 | goto out_err_free; |
16b374ca | 589 | } |
35124a09 WAA |
590 | |
591 | p = xdr_inline_decode(&stream, fl->fh_array[i]->size); | |
592 | if (unlikely(!p)) | |
593 | goto out_err_free; | |
16b374ca | 594 | memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); |
16b374ca AA |
595 | dprintk("DEBUG: %s: fh len %d\n", __func__, |
596 | fl->fh_array[i]->size); | |
597 | } | |
598 | ||
35124a09 | 599 | __free_page(scratch); |
16b374ca | 600 | return 0; |
35124a09 WAA |
601 | |
602 | out_err_free: | |
603 | filelayout_free_fh_array(fl); | |
604 | out_err: | |
605 | __free_page(scratch); | |
606 | return -EIO; | |
16b374ca AA |
607 | } |
608 | ||
c879513e FI |
609 | static void |
610 | filelayout_free_lseg(struct pnfs_layout_segment *lseg) | |
611 | { | |
612 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
613 | ||
614 | dprintk("--> %s\n", __func__); | |
615 | nfs4_fl_put_deviceid(fl->dsaddr); | |
425eb736 | 616 | kfree(fl->commit_buckets); |
c879513e FI |
617 | _filelayout_free_lseg(fl); |
618 | } | |
619 | ||
16b374ca AA |
620 | static struct pnfs_layout_segment * |
621 | filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, | |
a75b9df9 TM |
622 | struct nfs4_layoutget_res *lgr, |
623 | gfp_t gfp_flags) | |
16b374ca AA |
624 | { |
625 | struct nfs4_filelayout_segment *fl; | |
626 | int rc; | |
627 | struct nfs4_deviceid id; | |
628 | ||
629 | dprintk("--> %s\n", __func__); | |
a75b9df9 | 630 | fl = kzalloc(sizeof(*fl), gfp_flags); |
16b374ca AA |
631 | if (!fl) |
632 | return NULL; | |
633 | ||
a75b9df9 TM |
634 | rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags); |
635 | if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) { | |
16b374ca AA |
636 | _filelayout_free_lseg(fl); |
637 | return NULL; | |
638 | } | |
425eb736 FI |
639 | |
640 | /* This assumes there is only one IOMODE_RW lseg. What | |
641 | * we really want to do is have a layout_hdr level | |
642 | * dictionary of <multipath_list4, fh> keys, each | |
643 | * associated with a struct list_head, populated by calls | |
644 | * to filelayout_write_pagelist(). | |
645 | * */ | |
646 | if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) { | |
647 | int i; | |
648 | int size = (fl->stripe_type == STRIPE_SPARSE) ? | |
649 | fl->dsaddr->ds_num : fl->dsaddr->stripe_count; | |
650 | ||
a75b9df9 | 651 | fl->commit_buckets = kcalloc(size, sizeof(struct list_head), gfp_flags); |
425eb736 FI |
652 | if (!fl->commit_buckets) { |
653 | filelayout_free_lseg(&fl->generic_hdr); | |
654 | return NULL; | |
655 | } | |
656 | fl->number_of_buckets = size; | |
657 | for (i = 0; i < size; i++) | |
658 | INIT_LIST_HEAD(&fl->commit_buckets[i]); | |
659 | } | |
16b374ca AA |
660 | return &fl->generic_hdr; |
661 | } | |
662 | ||
94ad1c80 FI |
663 | /* |
664 | * filelayout_pg_test(). Called by nfs_can_coalesce_requests() | |
665 | * | |
18ad0a9f BH |
666 | * return true : coalesce page |
667 | * return false : don't coalesce page | |
94ad1c80 | 668 | */ |
1751c363 | 669 | static bool |
94ad1c80 FI |
670 | filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
671 | struct nfs_page *req) | |
672 | { | |
673 | u64 p_stripe, r_stripe; | |
674 | u32 stripe_unit; | |
675 | ||
19345cb2 BH |
676 | if (!pnfs_generic_pg_test(pgio, prev, req) || |
677 | !nfs_generic_pg_test(pgio, prev, req)) | |
678 | return false; | |
89a58e32 | 679 | |
94ad1c80 FI |
680 | p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT; |
681 | r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT; | |
682 | stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; | |
683 | ||
684 | do_div(p_stripe, stripe_unit); | |
685 | do_div(r_stripe, stripe_unit); | |
686 | ||
687 | return (p_stripe == r_stripe); | |
688 | } | |
689 | ||
7c24d948 AA |
690 | void |
691 | filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, | |
692 | struct nfs_page *req) | |
693 | { | |
694 | BUG_ON(pgio->pg_lseg != NULL); | |
695 | ||
696 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, | |
697 | req->wb_context, | |
698 | 0, | |
699 | NFS4_MAX_UINT64, | |
700 | IOMODE_READ, | |
701 | GFP_KERNEL); | |
702 | /* If no lseg, fall back to read through mds */ | |
703 | if (pgio->pg_lseg == NULL) | |
704 | nfs_pageio_init_read_mds(pgio, pgio->pg_inode); | |
705 | } | |
706 | ||
707 | void | |
708 | filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, | |
709 | struct nfs_page *req) | |
710 | { | |
711 | BUG_ON(pgio->pg_lseg != NULL); | |
712 | ||
713 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, | |
714 | req->wb_context, | |
715 | 0, | |
716 | NFS4_MAX_UINT64, | |
717 | IOMODE_RW, | |
718 | GFP_NOFS); | |
719 | /* If no lseg, fall back to write through mds */ | |
720 | if (pgio->pg_lseg == NULL) | |
721 | nfs_pageio_init_write_mds(pgio, pgio->pg_inode, | |
722 | pgio->pg_ioflags); | |
723 | } | |
724 | ||
1751c363 | 725 | static const struct nfs_pageio_ops filelayout_pg_read_ops = { |
7c24d948 | 726 | .pg_init = filelayout_pg_init_read, |
1751c363 TM |
727 | .pg_test = filelayout_pg_test, |
728 | .pg_doio = nfs_generic_pg_readpages, | |
729 | }; | |
730 | ||
731 | static const struct nfs_pageio_ops filelayout_pg_write_ops = { | |
7c24d948 | 732 | .pg_init = filelayout_pg_init_write, |
1751c363 TM |
733 | .pg_test = filelayout_pg_test, |
734 | .pg_doio = nfs_generic_pg_writepages, | |
735 | }; | |
736 | ||
e0c2b380 FI |
737 | static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg) |
738 | { | |
739 | return !FILELAYOUT_LSEG(lseg)->commit_through_mds; | |
740 | } | |
741 | ||
742 | static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) | |
743 | { | |
744 | if (fl->stripe_type == STRIPE_SPARSE) | |
745 | return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); | |
746 | else | |
747 | return j; | |
748 | } | |
749 | ||
750 | struct list_head *filelayout_choose_commit_list(struct nfs_page *req) | |
751 | { | |
752 | struct pnfs_layout_segment *lseg = req->wb_commit_lseg; | |
753 | struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); | |
754 | u32 i, j; | |
755 | struct list_head *list; | |
756 | ||
757 | /* Note that we are calling nfs4_fl_calc_j_index on each page | |
758 | * that ends up being committed to a data server. An attractive | |
759 | * alternative is to add a field to nfs_write_data and nfs_page | |
760 | * to store the value calculated in filelayout_write_pagelist | |
761 | * and just use that here. | |
762 | */ | |
763 | j = nfs4_fl_calc_j_index(lseg, | |
764 | (loff_t)req->wb_index << PAGE_CACHE_SHIFT); | |
765 | i = select_bucket_index(fl, j); | |
766 | list = &fl->commit_buckets[i]; | |
767 | if (list_empty(list)) { | |
768 | /* Non-empty buckets hold a reference on the lseg */ | |
769 | get_lseg(lseg); | |
770 | } | |
771 | return list; | |
772 | } | |
773 | ||
774 | static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) | |
775 | { | |
776 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
777 | ||
778 | if (flseg->stripe_type == STRIPE_SPARSE) | |
779 | return i; | |
780 | else | |
781 | return nfs4_fl_calc_ds_index(lseg, i); | |
782 | } | |
783 | ||
784 | static struct nfs_fh * | |
785 | select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) | |
786 | { | |
787 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); | |
788 | ||
789 | if (flseg->stripe_type == STRIPE_SPARSE) { | |
790 | if (flseg->num_fh == 1) | |
791 | i = 0; | |
792 | else if (flseg->num_fh == 0) | |
793 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ | |
794 | return NULL; | |
795 | } | |
796 | return flseg->fh_array[i]; | |
797 | } | |
798 | ||
799 | static int filelayout_initiate_commit(struct nfs_write_data *data, int how) | |
800 | { | |
801 | struct pnfs_layout_segment *lseg = data->lseg; | |
802 | struct nfs4_pnfs_ds *ds; | |
803 | u32 idx; | |
804 | struct nfs_fh *fh; | |
805 | ||
806 | idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); | |
807 | ds = nfs4_fl_prepare_ds(lseg, idx); | |
808 | if (!ds) { | |
809 | printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__); | |
810 | set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); | |
811 | set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); | |
812 | prepare_to_resend_writes(data); | |
813 | data->mds_ops->rpc_release(data); | |
814 | return -EAGAIN; | |
815 | } | |
816 | dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how); | |
817 | data->write_done_cb = filelayout_commit_done_cb; | |
818 | data->ds_clp = ds->ds_clp; | |
819 | fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); | |
820 | if (fh) | |
821 | data->args.fh = fh; | |
822 | return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient, | |
823 | &filelayout_commit_call_ops, how); | |
824 | } | |
825 | ||
826 | /* | |
827 | * This is only useful while we are using whole file layouts. | |
828 | */ | |
829 | static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode) | |
830 | { | |
831 | struct pnfs_layout_segment *lseg, *rv = NULL; | |
832 | ||
833 | spin_lock(&inode->i_lock); | |
834 | list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) | |
835 | if (lseg->pls_range.iomode == IOMODE_RW) | |
836 | rv = get_lseg(lseg); | |
837 | spin_unlock(&inode->i_lock); | |
838 | return rv; | |
839 | } | |
840 | ||
841 | static int alloc_ds_commits(struct inode *inode, struct list_head *list) | |
842 | { | |
843 | struct pnfs_layout_segment *lseg; | |
844 | struct nfs4_filelayout_segment *fl; | |
845 | struct nfs_write_data *data; | |
846 | int i, j; | |
847 | ||
848 | /* Won't need this when non-whole file layout segments are supported | |
849 | * instead we will use a pnfs_layout_hdr structure */ | |
850 | lseg = find_only_write_lseg(inode); | |
851 | if (!lseg) | |
852 | return 0; | |
853 | fl = FILELAYOUT_LSEG(lseg); | |
854 | for (i = 0; i < fl->number_of_buckets; i++) { | |
855 | if (list_empty(&fl->commit_buckets[i])) | |
856 | continue; | |
857 | data = nfs_commitdata_alloc(); | |
858 | if (!data) | |
859 | goto out_bad; | |
860 | data->ds_commit_index = i; | |
861 | data->lseg = lseg; | |
862 | list_add(&data->pages, list); | |
863 | } | |
864 | put_lseg(lseg); | |
865 | return 0; | |
866 | ||
867 | out_bad: | |
868 | for (j = i; j < fl->number_of_buckets; j++) { | |
869 | if (list_empty(&fl->commit_buckets[i])) | |
870 | continue; | |
871 | nfs_retry_commit(&fl->commit_buckets[i], lseg); | |
872 | put_lseg(lseg); /* associated with emptying bucket */ | |
873 | } | |
874 | put_lseg(lseg); | |
875 | /* Caller will clean up entries put on list */ | |
876 | return -ENOMEM; | |
877 | } | |
878 | ||
879 | /* This follows nfs_commit_list pretty closely */ | |
880 | static int | |
881 | filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
882 | int how) | |
883 | { | |
884 | struct nfs_write_data *data, *tmp; | |
885 | LIST_HEAD(list); | |
886 | ||
887 | if (!list_empty(mds_pages)) { | |
888 | data = nfs_commitdata_alloc(); | |
889 | if (!data) | |
890 | goto out_bad; | |
891 | data->lseg = NULL; | |
892 | list_add(&data->pages, &list); | |
893 | } | |
894 | ||
895 | if (alloc_ds_commits(inode, &list)) | |
896 | goto out_bad; | |
897 | ||
898 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
899 | list_del_init(&data->pages); | |
900 | atomic_inc(&NFS_I(inode)->commits_outstanding); | |
901 | if (!data->lseg) { | |
902 | nfs_init_commit(data, mds_pages, NULL); | |
903 | nfs_initiate_commit(data, NFS_CLIENT(inode), | |
904 | data->mds_ops, how); | |
905 | } else { | |
906 | nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg); | |
907 | filelayout_initiate_commit(data, how); | |
908 | } | |
909 | } | |
910 | return 0; | |
911 | out_bad: | |
912 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
913 | nfs_retry_commit(&data->pages, data->lseg); | |
914 | list_del_init(&data->pages); | |
915 | nfs_commit_free(data); | |
916 | } | |
917 | nfs_retry_commit(mds_pages, NULL); | |
918 | nfs_commit_clear_lock(NFS_I(inode)); | |
919 | return -ENOMEM; | |
920 | } | |
921 | ||
1775bc34 BH |
922 | static void |
923 | filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d) | |
924 | { | |
925 | nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); | |
926 | } | |
927 | ||
7ab672ce | 928 | static struct pnfs_layoutdriver_type filelayout_type = { |
ea8eecdd CH |
929 | .id = LAYOUT_NFSV4_1_FILES, |
930 | .name = "LAYOUT_NFSV4_1_FILES", | |
931 | .owner = THIS_MODULE, | |
932 | .alloc_lseg = filelayout_alloc_lseg, | |
933 | .free_lseg = filelayout_free_lseg, | |
1751c363 TM |
934 | .pg_read_ops = &filelayout_pg_read_ops, |
935 | .pg_write_ops = &filelayout_pg_write_ops, | |
e0c2b380 FI |
936 | .mark_pnfs_commit = filelayout_mark_pnfs_commit, |
937 | .choose_commit_list = filelayout_choose_commit_list, | |
938 | .commit_pagelist = filelayout_commit_pagelist, | |
dc70d7b3 | 939 | .read_pagelist = filelayout_read_pagelist, |
0382b744 | 940 | .write_pagelist = filelayout_write_pagelist, |
1775bc34 | 941 | .free_deviceid_node = filelayout_free_deveiceid_node, |
7ab672ce DH |
942 | }; |
943 | ||
944 | static int __init nfs4filelayout_init(void) | |
945 | { | |
946 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", | |
947 | __func__); | |
948 | return pnfs_register_layoutdriver(&filelayout_type); | |
949 | } | |
950 | ||
951 | static void __exit nfs4filelayout_exit(void) | |
952 | { | |
953 | printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", | |
954 | __func__); | |
955 | pnfs_unregister_layoutdriver(&filelayout_type); | |
956 | } | |
957 | ||
958 | module_init(nfs4filelayout_init); | |
959 | module_exit(nfs4filelayout_exit); |