HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
[linux/fpc-iii.git] / fs / nfs / filelayout / filelayout.c
blob8e268965c96d920863d77306c0b4d95c65ab738d
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.
6 * Copyright (c) 2002
7 * The Regents of the University of Michigan
8 * All Rights Reserved
10 * Dean Hildebrand <dhildebz@umich.edu>
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.
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.
32 #include <linux/nfs_fs.h>
33 #include <linux/nfs_page.h>
34 #include <linux/module.h>
35 #include <linux/backing-dev.h>
37 #include <linux/sunrpc/metrics.h>
39 #include "../nfs4session.h"
40 #include "../internal.h"
41 #include "../delegation.h"
42 #include "filelayout.h"
43 #include "../nfs4trace.h"
45 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
47 MODULE_LICENSE("GPL");
48 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
49 MODULE_DESCRIPTION("The NFSv4 file layout driver");
51 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
53 static loff_t
54 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
55 loff_t offset)
57 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
58 u64 stripe_no;
59 u32 rem;
61 offset -= flseg->pattern_offset;
62 stripe_no = div_u64(offset, stripe_width);
63 div_u64_rem(offset, flseg->stripe_unit, &rem);
65 return stripe_no * flseg->stripe_unit + rem;
68 /* This function is used by the layout driver to calculate the
69 * offset of the file on the dserver based on whether the
70 * layout type is STRIPE_DENSE or STRIPE_SPARSE
72 static loff_t
73 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
75 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
77 switch (flseg->stripe_type) {
78 case STRIPE_SPARSE:
79 return offset;
81 case STRIPE_DENSE:
82 return filelayout_get_dense_offset(flseg, offset);
85 BUG();
88 static void filelayout_reset_write(struct nfs_pgio_header *hdr)
90 struct rpc_task *task = &hdr->task;
92 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
93 dprintk("%s Reset task %5u for i/o through MDS "
94 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
95 hdr->task.tk_pid,
96 hdr->inode->i_sb->s_id,
97 (unsigned long long)NFS_FILEID(hdr->inode),
98 hdr->args.count,
99 (unsigned long long)hdr->args.offset);
101 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
105 static void filelayout_reset_read(struct nfs_pgio_header *hdr)
107 struct rpc_task *task = &hdr->task;
109 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
110 dprintk("%s Reset task %5u for i/o through MDS "
111 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
112 hdr->task.tk_pid,
113 hdr->inode->i_sb->s_id,
114 (unsigned long long)NFS_FILEID(hdr->inode),
115 hdr->args.count,
116 (unsigned long long)hdr->args.offset);
118 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
122 static int filelayout_async_handle_error(struct rpc_task *task,
123 struct nfs4_state *state,
124 struct nfs_client *clp,
125 struct pnfs_layout_segment *lseg)
127 struct pnfs_layout_hdr *lo = lseg->pls_layout;
128 struct inode *inode = lo->plh_inode;
129 struct nfs_server *mds_server = NFS_SERVER(inode);
130 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
131 struct nfs_client *mds_client = mds_server->nfs_client;
132 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
134 if (task->tk_status >= 0)
135 return 0;
137 switch (task->tk_status) {
138 /* MDS state errors */
139 case -NFS4ERR_DELEG_REVOKED:
140 case -NFS4ERR_ADMIN_REVOKED:
141 case -NFS4ERR_BAD_STATEID:
142 case -NFS4ERR_OPENMODE:
143 if (state == NULL)
144 break;
145 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
146 goto out_bad_stateid;
147 goto wait_on_recovery;
148 case -NFS4ERR_EXPIRED:
149 if (state != NULL) {
150 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
151 goto out_bad_stateid;
153 nfs4_schedule_lease_recovery(mds_client);
154 goto wait_on_recovery;
155 /* DS session errors */
156 case -NFS4ERR_BADSESSION:
157 case -NFS4ERR_BADSLOT:
158 case -NFS4ERR_BAD_HIGH_SLOT:
159 case -NFS4ERR_DEADSESSION:
160 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
161 case -NFS4ERR_SEQ_FALSE_RETRY:
162 case -NFS4ERR_SEQ_MISORDERED:
163 dprintk("%s ERROR %d, Reset session. Exchangeid "
164 "flags 0x%x\n", __func__, task->tk_status,
165 clp->cl_exchange_flags);
166 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
167 break;
168 case -NFS4ERR_DELAY:
169 case -NFS4ERR_GRACE:
170 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
171 break;
172 case -NFS4ERR_RETRY_UNCACHED_REP:
173 break;
174 /* Invalidate Layout errors */
175 case -NFS4ERR_PNFS_NO_LAYOUT:
176 case -ESTALE: /* mapped NFS4ERR_STALE */
177 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
178 case -EISDIR: /* mapped NFS4ERR_ISDIR */
179 case -NFS4ERR_FHEXPIRED:
180 case -NFS4ERR_WRONG_TYPE:
181 dprintk("%s Invalid layout error %d\n", __func__,
182 task->tk_status);
184 * Destroy layout so new i/o will get a new layout.
185 * Layout will not be destroyed until all current lseg
186 * references are put. Mark layout as invalid to resend failed
187 * i/o and all i/o waiting on the slot table to the MDS until
188 * layout is destroyed and a new valid layout is obtained.
190 pnfs_destroy_layout(NFS_I(inode));
191 rpc_wake_up(&tbl->slot_tbl_waitq);
192 goto reset;
193 /* RPC connection errors */
194 case -ECONNREFUSED:
195 case -EHOSTDOWN:
196 case -EHOSTUNREACH:
197 case -ENETUNREACH:
198 case -EIO:
199 case -ETIMEDOUT:
200 case -EPIPE:
201 dprintk("%s DS connection error %d\n", __func__,
202 task->tk_status);
203 nfs4_mark_deviceid_unavailable(devid);
204 pnfs_error_mark_layout_for_return(inode, lseg);
205 rpc_wake_up(&tbl->slot_tbl_waitq);
206 /* fall through */
207 default:
208 reset:
209 dprintk("%s Retry through MDS. Error %d\n", __func__,
210 task->tk_status);
211 return -NFS4ERR_RESET_TO_MDS;
213 out:
214 task->tk_status = 0;
215 return -EAGAIN;
216 out_bad_stateid:
217 task->tk_status = -EIO;
218 return 0;
219 wait_on_recovery:
220 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
221 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
222 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
223 goto out;
226 /* NFS_PROTO call done callback routines */
228 static int filelayout_read_done_cb(struct rpc_task *task,
229 struct nfs_pgio_header *hdr)
231 int err;
233 trace_nfs4_pnfs_read(hdr, task->tk_status);
234 err = filelayout_async_handle_error(task, hdr->args.context->state,
235 hdr->ds_clp, hdr->lseg);
237 switch (err) {
238 case -NFS4ERR_RESET_TO_MDS:
239 filelayout_reset_read(hdr);
240 return task->tk_status;
241 case -EAGAIN:
242 rpc_restart_call_prepare(task);
243 return -EAGAIN;
246 return 0;
250 * We reference the rpc_cred of the first WRITE that triggers the need for
251 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
252 * rfc5661 is not clear about which credential should be used.
254 static void
255 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr)
258 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
259 hdr->res.verf->committed != NFS_DATA_SYNC)
260 return;
262 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
263 hdr->mds_offset + hdr->res.count);
264 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
265 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
268 bool
269 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
271 return filelayout_test_devid_invalid(node) ||
272 nfs4_test_deviceid_unavailable(node);
275 static bool
276 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
278 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
280 return filelayout_test_devid_unavailable(node);
284 * Call ops for the async read/write cases
285 * In the case of dense layouts, the offset needs to be reset to its
286 * original value.
288 static void filelayout_read_prepare(struct rpc_task *task, void *data)
290 struct nfs_pgio_header *hdr = data;
292 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
293 rpc_exit(task, -EIO);
294 return;
296 if (filelayout_reset_to_mds(hdr->lseg)) {
297 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
298 filelayout_reset_read(hdr);
299 rpc_exit(task, 0);
300 return;
302 hdr->pgio_done_cb = filelayout_read_done_cb;
304 if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
305 &hdr->args.seq_args,
306 &hdr->res.seq_res,
307 task))
308 return;
309 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
310 hdr->args.lock_context, FMODE_READ) == -EIO)
311 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
314 static void filelayout_read_call_done(struct rpc_task *task, void *data)
316 struct nfs_pgio_header *hdr = data;
318 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
320 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
321 task->tk_status == 0) {
322 nfs41_sequence_done(task, &hdr->res.seq_res);
323 return;
326 /* Note this may cause RPC to be resent */
327 hdr->mds_ops->rpc_call_done(task, data);
330 static void filelayout_read_count_stats(struct rpc_task *task, void *data)
332 struct nfs_pgio_header *hdr = data;
334 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
337 static int filelayout_write_done_cb(struct rpc_task *task,
338 struct nfs_pgio_header *hdr)
340 int err;
342 trace_nfs4_pnfs_write(hdr, task->tk_status);
343 err = filelayout_async_handle_error(task, hdr->args.context->state,
344 hdr->ds_clp, hdr->lseg);
346 switch (err) {
347 case -NFS4ERR_RESET_TO_MDS:
348 filelayout_reset_write(hdr);
349 return task->tk_status;
350 case -EAGAIN:
351 rpc_restart_call_prepare(task);
352 return -EAGAIN;
355 filelayout_set_layoutcommit(hdr);
356 return 0;
359 static int filelayout_commit_done_cb(struct rpc_task *task,
360 struct nfs_commit_data *data)
362 int err;
364 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
365 err = filelayout_async_handle_error(task, NULL, data->ds_clp,
366 data->lseg);
368 switch (err) {
369 case -NFS4ERR_RESET_TO_MDS:
370 pnfs_generic_prepare_to_resend_writes(data);
371 return -EAGAIN;
372 case -EAGAIN:
373 rpc_restart_call_prepare(task);
374 return -EAGAIN;
377 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
379 return 0;
382 static void filelayout_write_prepare(struct rpc_task *task, void *data)
384 struct nfs_pgio_header *hdr = data;
386 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
387 rpc_exit(task, -EIO);
388 return;
390 if (filelayout_reset_to_mds(hdr->lseg)) {
391 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
392 filelayout_reset_write(hdr);
393 rpc_exit(task, 0);
394 return;
396 if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
397 &hdr->args.seq_args,
398 &hdr->res.seq_res,
399 task))
400 return;
401 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
402 hdr->args.lock_context, FMODE_WRITE) == -EIO)
403 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
406 static void filelayout_write_call_done(struct rpc_task *task, void *data)
408 struct nfs_pgio_header *hdr = data;
410 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
411 task->tk_status == 0) {
412 nfs41_sequence_done(task, &hdr->res.seq_res);
413 return;
416 /* Note this may cause RPC to be resent */
417 hdr->mds_ops->rpc_call_done(task, data);
420 static void filelayout_write_count_stats(struct rpc_task *task, void *data)
422 struct nfs_pgio_header *hdr = data;
424 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
427 static void filelayout_commit_prepare(struct rpc_task *task, void *data)
429 struct nfs_commit_data *wdata = data;
431 nfs41_setup_sequence(wdata->ds_clp->cl_session,
432 &wdata->args.seq_args,
433 &wdata->res.seq_res,
434 task);
437 static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
439 struct nfs_commit_data *cdata = data;
441 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
444 static const struct rpc_call_ops filelayout_read_call_ops = {
445 .rpc_call_prepare = filelayout_read_prepare,
446 .rpc_call_done = filelayout_read_call_done,
447 .rpc_count_stats = filelayout_read_count_stats,
448 .rpc_release = pnfs_generic_rw_release,
451 static const struct rpc_call_ops filelayout_write_call_ops = {
452 .rpc_call_prepare = filelayout_write_prepare,
453 .rpc_call_done = filelayout_write_call_done,
454 .rpc_count_stats = filelayout_write_count_stats,
455 .rpc_release = pnfs_generic_rw_release,
458 static const struct rpc_call_ops filelayout_commit_call_ops = {
459 .rpc_call_prepare = filelayout_commit_prepare,
460 .rpc_call_done = pnfs_generic_write_commit_done,
461 .rpc_count_stats = filelayout_commit_count_stats,
462 .rpc_release = pnfs_generic_commit_release,
465 static enum pnfs_try_status
466 filelayout_read_pagelist(struct nfs_pgio_header *hdr)
468 struct pnfs_layout_segment *lseg = hdr->lseg;
469 struct nfs4_pnfs_ds *ds;
470 struct rpc_clnt *ds_clnt;
471 loff_t offset = hdr->args.offset;
472 u32 j, idx;
473 struct nfs_fh *fh;
475 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
476 __func__, hdr->inode->i_ino,
477 hdr->args.pgbase, (size_t)hdr->args.count, offset);
479 /* Retrieve the correct rpc_client for the byte range */
480 j = nfs4_fl_calc_j_index(lseg, offset);
481 idx = nfs4_fl_calc_ds_index(lseg, j);
482 ds = nfs4_fl_prepare_ds(lseg, idx);
483 if (!ds)
484 return PNFS_NOT_ATTEMPTED;
486 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
487 if (IS_ERR(ds_clnt))
488 return PNFS_NOT_ATTEMPTED;
490 dprintk("%s USE DS: %s cl_count %d\n", __func__,
491 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
493 /* No multipath support. Use first DS */
494 atomic_inc(&ds->ds_clp->cl_count);
495 hdr->ds_clp = ds->ds_clp;
496 hdr->ds_commit_idx = idx;
497 fh = nfs4_fl_select_ds_fh(lseg, j);
498 if (fh)
499 hdr->args.fh = fh;
501 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
502 hdr->mds_offset = offset;
504 /* Perform an asynchronous read to ds */
505 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred,
506 NFS_PROTO(hdr->inode), &filelayout_read_call_ops,
507 0, RPC_TASK_SOFTCONN);
508 return PNFS_ATTEMPTED;
511 /* Perform async writes. */
512 static enum pnfs_try_status
513 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
515 struct pnfs_layout_segment *lseg = hdr->lseg;
516 struct nfs4_pnfs_ds *ds;
517 struct rpc_clnt *ds_clnt;
518 loff_t offset = hdr->args.offset;
519 u32 j, idx;
520 struct nfs_fh *fh;
522 /* Retrieve the correct rpc_client for the byte range */
523 j = nfs4_fl_calc_j_index(lseg, offset);
524 idx = nfs4_fl_calc_ds_index(lseg, j);
525 ds = nfs4_fl_prepare_ds(lseg, idx);
526 if (!ds)
527 return PNFS_NOT_ATTEMPTED;
529 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
530 if (IS_ERR(ds_clnt))
531 return PNFS_NOT_ATTEMPTED;
533 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
534 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
535 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
537 hdr->pgio_done_cb = filelayout_write_done_cb;
538 atomic_inc(&ds->ds_clp->cl_count);
539 hdr->ds_clp = ds->ds_clp;
540 hdr->ds_commit_idx = idx;
541 fh = nfs4_fl_select_ds_fh(lseg, j);
542 if (fh)
543 hdr->args.fh = fh;
544 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
546 /* Perform an asynchronous write */
547 nfs_initiate_pgio(ds_clnt, hdr, hdr->cred,
548 NFS_PROTO(hdr->inode), &filelayout_write_call_ops,
549 sync, RPC_TASK_SOFTCONN);
550 return PNFS_ATTEMPTED;
554 * filelayout_check_layout()
556 * Make sure layout segment parameters are sane WRT the device.
557 * At this point no generic layer initialization of the lseg has occurred,
558 * and nothing has been added to the layout_hdr cache.
561 static int
562 filelayout_check_layout(struct pnfs_layout_hdr *lo,
563 struct nfs4_filelayout_segment *fl,
564 struct nfs4_layoutget_res *lgr,
565 struct nfs4_deviceid *id,
566 gfp_t gfp_flags)
568 struct nfs4_deviceid_node *d;
569 struct nfs4_file_layout_dsaddr *dsaddr;
570 int status = -EINVAL;
572 dprintk("--> %s\n", __func__);
574 /* FIXME: remove this check when layout segment support is added */
575 if (lgr->range.offset != 0 ||
576 lgr->range.length != NFS4_MAX_UINT64) {
577 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
578 __func__);
579 goto out;
582 if (fl->pattern_offset > lgr->range.offset) {
583 dprintk("%s pattern_offset %lld too large\n",
584 __func__, fl->pattern_offset);
585 goto out;
588 if (!fl->stripe_unit) {
589 dprintk("%s Invalid stripe unit (%u)\n",
590 __func__, fl->stripe_unit);
591 goto out;
594 /* find and reference the deviceid */
595 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id,
596 lo->plh_lc_cred, gfp_flags);
597 if (d == NULL)
598 goto out;
600 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
601 /* Found deviceid is unavailable */
602 if (filelayout_test_devid_unavailable(&dsaddr->id_node))
603 goto out_put;
605 fl->dsaddr = dsaddr;
607 if (fl->first_stripe_index >= dsaddr->stripe_count) {
608 dprintk("%s Bad first_stripe_index %u\n",
609 __func__, fl->first_stripe_index);
610 goto out_put;
613 if ((fl->stripe_type == STRIPE_SPARSE &&
614 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
615 (fl->stripe_type == STRIPE_DENSE &&
616 fl->num_fh != dsaddr->stripe_count)) {
617 dprintk("%s num_fh %u not valid for given packing\n",
618 __func__, fl->num_fh);
619 goto out_put;
622 status = 0;
623 out:
624 dprintk("--> %s returns %d\n", __func__, status);
625 return status;
626 out_put:
627 nfs4_fl_put_deviceid(dsaddr);
628 goto out;
631 static void _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
633 int i;
635 if (fl->fh_array) {
636 for (i = 0; i < fl->num_fh; i++) {
637 if (!fl->fh_array[i])
638 break;
639 kfree(fl->fh_array[i]);
641 kfree(fl->fh_array);
643 kfree(fl);
646 static int
647 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
648 struct nfs4_filelayout_segment *fl,
649 struct nfs4_layoutget_res *lgr,
650 struct nfs4_deviceid *id,
651 gfp_t gfp_flags)
653 struct xdr_stream stream;
654 struct xdr_buf buf;
655 struct page *scratch;
656 __be32 *p;
657 uint32_t nfl_util;
658 int i;
660 dprintk("%s: set_layout_map Begin\n", __func__);
662 scratch = alloc_page(gfp_flags);
663 if (!scratch)
664 return -ENOMEM;
666 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
667 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
669 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
670 * num_fh (4) */
671 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
672 if (unlikely(!p))
673 goto out_err;
675 memcpy(id, p, sizeof(*id));
676 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
677 nfs4_print_deviceid(id);
679 nfl_util = be32_to_cpup(p++);
680 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
681 fl->commit_through_mds = 1;
682 if (nfl_util & NFL4_UFLG_DENSE)
683 fl->stripe_type = STRIPE_DENSE;
684 else
685 fl->stripe_type = STRIPE_SPARSE;
686 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
688 fl->first_stripe_index = be32_to_cpup(p++);
689 p = xdr_decode_hyper(p, &fl->pattern_offset);
690 fl->num_fh = be32_to_cpup(p++);
692 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
693 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
694 fl->pattern_offset);
696 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
697 * Futher checking is done in filelayout_check_layout */
698 if (fl->num_fh >
699 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
700 goto out_err;
702 if (fl->num_fh > 0) {
703 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
704 gfp_flags);
705 if (!fl->fh_array)
706 goto out_err;
709 for (i = 0; i < fl->num_fh; i++) {
710 /* Do we want to use a mempool here? */
711 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
712 if (!fl->fh_array[i])
713 goto out_err;
715 p = xdr_inline_decode(&stream, 4);
716 if (unlikely(!p))
717 goto out_err;
718 fl->fh_array[i]->size = be32_to_cpup(p++);
719 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
720 printk(KERN_ERR "NFS: Too big fh %d received %d\n",
721 i, fl->fh_array[i]->size);
722 goto out_err;
725 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
726 if (unlikely(!p))
727 goto out_err;
728 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
729 dprintk("DEBUG: %s: fh len %d\n", __func__,
730 fl->fh_array[i]->size);
733 __free_page(scratch);
734 return 0;
736 out_err:
737 __free_page(scratch);
738 return -EIO;
741 static void
742 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
744 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
746 dprintk("--> %s\n", __func__);
747 nfs4_fl_put_deviceid(fl->dsaddr);
748 /* This assumes a single RW lseg */
749 if (lseg->pls_range.iomode == IOMODE_RW) {
750 struct nfs4_filelayout *flo;
752 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
753 flo->commit_info.nbuckets = 0;
754 kfree(flo->commit_info.buckets);
755 flo->commit_info.buckets = NULL;
757 _filelayout_free_lseg(fl);
760 static int
761 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
762 struct nfs_commit_info *cinfo,
763 gfp_t gfp_flags)
765 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
766 struct pnfs_commit_bucket *buckets;
767 int size, i;
769 if (fl->commit_through_mds)
770 return 0;
772 size = (fl->stripe_type == STRIPE_SPARSE) ?
773 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
775 if (cinfo->ds->nbuckets >= size) {
776 /* This assumes there is only one IOMODE_RW lseg. What
777 * we really want to do is have a layout_hdr level
778 * dictionary of <multipath_list4, fh> keys, each
779 * associated with a struct list_head, populated by calls
780 * to filelayout_write_pagelist().
781 * */
782 return 0;
785 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
786 gfp_flags);
787 if (!buckets)
788 return -ENOMEM;
789 for (i = 0; i < size; i++) {
790 INIT_LIST_HEAD(&buckets[i].written);
791 INIT_LIST_HEAD(&buckets[i].committing);
792 /* mark direct verifier as unset */
793 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
796 spin_lock(cinfo->lock);
797 if (cinfo->ds->nbuckets >= size)
798 goto out;
799 for (i = 0; i < cinfo->ds->nbuckets; i++) {
800 list_splice(&cinfo->ds->buckets[i].written,
801 &buckets[i].written);
802 list_splice(&cinfo->ds->buckets[i].committing,
803 &buckets[i].committing);
804 buckets[i].direct_verf.committed =
805 cinfo->ds->buckets[i].direct_verf.committed;
806 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg;
807 buckets[i].clseg = cinfo->ds->buckets[i].clseg;
809 swap(cinfo->ds->buckets, buckets);
810 cinfo->ds->nbuckets = size;
811 out:
812 spin_unlock(cinfo->lock);
813 kfree(buckets);
814 return 0;
817 static struct pnfs_layout_segment *
818 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
819 struct nfs4_layoutget_res *lgr,
820 gfp_t gfp_flags)
822 struct nfs4_filelayout_segment *fl;
823 int rc;
824 struct nfs4_deviceid id;
826 dprintk("--> %s\n", __func__);
827 fl = kzalloc(sizeof(*fl), gfp_flags);
828 if (!fl)
829 return NULL;
831 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
832 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
833 _filelayout_free_lseg(fl);
834 return NULL;
836 return &fl->generic_hdr;
840 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
842 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
843 * of bytes (maximum @req->wb_bytes) that can be coalesced.
845 static size_t
846 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
847 struct nfs_page *req)
849 unsigned int size;
850 u64 p_stripe, r_stripe;
851 u32 stripe_offset;
852 u64 segment_offset = pgio->pg_lseg->pls_range.offset;
853 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
855 /* calls nfs_generic_pg_test */
856 size = pnfs_generic_pg_test(pgio, prev, req);
857 if (!size)
858 return 0;
860 /* see if req and prev are in the same stripe */
861 if (prev) {
862 p_stripe = (u64)req_offset(prev) - segment_offset;
863 r_stripe = (u64)req_offset(req) - segment_offset;
864 do_div(p_stripe, stripe_unit);
865 do_div(r_stripe, stripe_unit);
867 if (p_stripe != r_stripe)
868 return 0;
871 /* calculate remaining bytes in the current stripe */
872 div_u64_rem((u64)req_offset(req) - segment_offset,
873 stripe_unit,
874 &stripe_offset);
875 WARN_ON_ONCE(stripe_offset > stripe_unit);
876 if (stripe_offset >= stripe_unit)
877 return 0;
878 return min(stripe_unit - (unsigned int)stripe_offset, size);
881 static void
882 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
883 struct nfs_page *req)
885 if (!pgio->pg_lseg) {
886 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
887 req->wb_context,
889 NFS4_MAX_UINT64,
890 IOMODE_READ,
891 GFP_KERNEL);
892 if (IS_ERR(pgio->pg_lseg)) {
893 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
894 pgio->pg_lseg = NULL;
895 return;
898 /* If no lseg, fall back to read through mds */
899 if (pgio->pg_lseg == NULL)
900 nfs_pageio_reset_read_mds(pgio);
903 static void
904 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
905 struct nfs_page *req)
907 struct nfs_commit_info cinfo;
908 int status;
910 if (!pgio->pg_lseg) {
911 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
912 req->wb_context,
914 NFS4_MAX_UINT64,
915 IOMODE_RW,
916 GFP_NOFS);
917 if (IS_ERR(pgio->pg_lseg)) {
918 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
919 pgio->pg_lseg = NULL;
920 return;
924 /* If no lseg, fall back to write through mds */
925 if (pgio->pg_lseg == NULL)
926 goto out_mds;
927 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
928 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
929 if (status < 0) {
930 pnfs_put_lseg(pgio->pg_lseg);
931 pgio->pg_lseg = NULL;
932 goto out_mds;
934 return;
935 out_mds:
936 nfs_pageio_reset_write_mds(pgio);
939 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
940 .pg_init = filelayout_pg_init_read,
941 .pg_test = filelayout_pg_test,
942 .pg_doio = pnfs_generic_pg_readpages,
943 .pg_cleanup = pnfs_generic_pg_cleanup,
946 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
947 .pg_init = filelayout_pg_init_write,
948 .pg_test = filelayout_pg_test,
949 .pg_doio = pnfs_generic_pg_writepages,
950 .pg_cleanup = pnfs_generic_pg_cleanup,
953 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
955 if (fl->stripe_type == STRIPE_SPARSE)
956 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
957 else
958 return j;
961 static void
962 filelayout_mark_request_commit(struct nfs_page *req,
963 struct pnfs_layout_segment *lseg,
964 struct nfs_commit_info *cinfo,
965 u32 ds_commit_idx)
968 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
969 u32 i, j;
971 if (fl->commit_through_mds) {
972 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
973 } else {
974 /* Note that we are calling nfs4_fl_calc_j_index on each page
975 * that ends up being committed to a data server. An attractive
976 * alternative is to add a field to nfs_write_data and nfs_page
977 * to store the value calculated in filelayout_write_pagelist
978 * and just use that here.
980 j = nfs4_fl_calc_j_index(lseg, req_offset(req));
981 i = select_bucket_index(fl, j);
982 pnfs_layout_mark_request_commit(req, lseg, cinfo, i);
986 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
988 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
990 if (flseg->stripe_type == STRIPE_SPARSE)
991 return i;
992 else
993 return nfs4_fl_calc_ds_index(lseg, i);
996 static struct nfs_fh *
997 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
999 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1001 if (flseg->stripe_type == STRIPE_SPARSE) {
1002 if (flseg->num_fh == 1)
1003 i = 0;
1004 else if (flseg->num_fh == 0)
1005 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1006 return NULL;
1008 return flseg->fh_array[i];
1011 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1013 struct pnfs_layout_segment *lseg = data->lseg;
1014 struct nfs4_pnfs_ds *ds;
1015 struct rpc_clnt *ds_clnt;
1016 u32 idx;
1017 struct nfs_fh *fh;
1019 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1020 ds = nfs4_fl_prepare_ds(lseg, idx);
1021 if (!ds)
1022 goto out_err;
1024 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode);
1025 if (IS_ERR(ds_clnt))
1026 goto out_err;
1028 dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1029 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1030 data->commit_done_cb = filelayout_commit_done_cb;
1031 atomic_inc(&ds->ds_clp->cl_count);
1032 data->ds_clp = ds->ds_clp;
1033 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1034 if (fh)
1035 data->args.fh = fh;
1036 return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode),
1037 &filelayout_commit_call_ops, how,
1038 RPC_TASK_SOFTCONN);
1039 out_err:
1040 pnfs_generic_prepare_to_resend_writes(data);
1041 pnfs_generic_commit_release(data);
1042 return -EAGAIN;
1045 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest
1046 * for @page
1047 * @cinfo - commit info for current inode
1048 * @page - page to search for matching head request
1050 * Returns a the head request if one is found, otherwise returns NULL.
1052 static struct nfs_page *
1053 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)
1055 struct nfs_page *freq, *t;
1056 struct pnfs_commit_bucket *b;
1057 int i;
1059 /* Linearly search the commit lists for each bucket until a matching
1060 * request is found */
1061 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1062 list_for_each_entry_safe(freq, t, &b->written, wb_list) {
1063 if (freq->wb_page == page)
1064 return freq->wb_head;
1066 list_for_each_entry_safe(freq, t, &b->committing, wb_list) {
1067 if (freq->wb_page == page)
1068 return freq->wb_head;
1072 return NULL;
1075 static int
1076 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1077 int how, struct nfs_commit_info *cinfo)
1079 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1080 filelayout_initiate_commit);
1083 static struct nfs4_deviceid_node *
1084 filelayout_alloc_deviceid_node(struct nfs_server *server,
1085 struct pnfs_device *pdev, gfp_t gfp_flags)
1087 struct nfs4_file_layout_dsaddr *dsaddr;
1089 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags);
1090 if (!dsaddr)
1091 return NULL;
1092 return &dsaddr->id_node;
1095 static void
1096 filelayout_free_deviceid_node(struct nfs4_deviceid_node *d)
1098 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1101 static struct pnfs_layout_hdr *
1102 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1104 struct nfs4_filelayout *flo;
1106 flo = kzalloc(sizeof(*flo), gfp_flags);
1107 return flo != NULL ? &flo->generic_hdr : NULL;
1110 static void
1111 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1113 kfree(FILELAYOUT_FROM_HDR(lo));
1116 static struct pnfs_ds_commit_info *
1117 filelayout_get_ds_info(struct inode *inode)
1119 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1121 if (layout == NULL)
1122 return NULL;
1123 else
1124 return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1127 static struct pnfs_layoutdriver_type filelayout_type = {
1128 .id = LAYOUT_NFSV4_1_FILES,
1129 .name = "LAYOUT_NFSV4_1_FILES",
1130 .owner = THIS_MODULE,
1131 .alloc_layout_hdr = filelayout_alloc_layout_hdr,
1132 .free_layout_hdr = filelayout_free_layout_hdr,
1133 .alloc_lseg = filelayout_alloc_lseg,
1134 .free_lseg = filelayout_free_lseg,
1135 .pg_read_ops = &filelayout_pg_read_ops,
1136 .pg_write_ops = &filelayout_pg_write_ops,
1137 .get_ds_info = &filelayout_get_ds_info,
1138 .mark_request_commit = filelayout_mark_request_commit,
1139 .clear_request_commit = pnfs_generic_clear_request_commit,
1140 .scan_commit_lists = pnfs_generic_scan_commit_lists,
1141 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
1142 .search_commit_reqs = filelayout_search_commit_reqs,
1143 .commit_pagelist = filelayout_commit_pagelist,
1144 .read_pagelist = filelayout_read_pagelist,
1145 .write_pagelist = filelayout_write_pagelist,
1146 .alloc_deviceid_node = filelayout_alloc_deviceid_node,
1147 .free_deviceid_node = filelayout_free_deviceid_node,
1148 .sync = pnfs_nfs_generic_sync,
1151 static int __init nfs4filelayout_init(void)
1153 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1154 __func__);
1155 return pnfs_register_layoutdriver(&filelayout_type);
1158 static void __exit nfs4filelayout_exit(void)
1160 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1161 __func__);
1162 pnfs_unregister_layoutdriver(&filelayout_type);
1165 MODULE_ALIAS("nfs-layouttype4-1");
1167 module_init(nfs4filelayout_init);
1168 module_exit(nfs4filelayout_exit);