kvm tools, setup: Create private directory
[linux-2.6/next.git] / fs / nfs / nfs4filelayout.c
blob0bafcc91c27f8d8513dc1a7c8776fefd3411eee2
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>
35 #include "internal.h"
36 #include "nfs4filelayout.h"
38 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
40 MODULE_LICENSE("GPL");
41 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
42 MODULE_DESCRIPTION("The NFSv4 file layout driver");
44 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
46 static loff_t
47 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
48 loff_t offset)
50 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
51 u64 tmp;
53 offset -= flseg->pattern_offset;
54 tmp = offset;
55 do_div(tmp, stripe_width);
57 return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
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
64 static loff_t
65 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
67 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
69 switch (flseg->stripe_type) {
70 case STRIPE_SPARSE:
71 return offset;
73 case STRIPE_DENSE:
74 return filelayout_get_dense_offset(flseg, offset);
77 BUG();
80 /* For data server errors we don't recover from */
81 static void
82 filelayout_set_lo_fail(struct pnfs_layout_segment *lseg)
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);
93 static int filelayout_async_handle_error(struct rpc_task *task,
94 struct nfs4_state *state,
95 struct nfs_client *clp,
96 int *reset)
98 if (task->tk_status >= 0)
99 return 0;
101 *reset = 0;
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;
121 case -NFS4ERR_RETRY_UNCACHED_REP:
122 break;
123 default:
124 dprintk("%s DS error. Retry through MDS %d\n", __func__,
125 task->tk_status);
126 *reset = 1;
127 break;
129 task->tk_status = 0;
130 return -EAGAIN;
133 /* NFS_PROTO call done callback routines */
135 static int filelayout_read_done_cb(struct rpc_task *task,
136 struct nfs_read_data *data)
138 struct nfs_client *clp = data->ds_clp;
139 int reset = 0;
141 dprintk("%s DS read\n", __func__);
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;
152 nfs_restart_rpc(task, clp);
153 return -EAGAIN;
156 return 0;
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.
164 static void
165 filelayout_set_layoutcommit(struct nfs_write_data *wdata)
167 if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds ||
168 wdata->res.verf->committed == NFS_FILE_SYNC)
169 return;
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);
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.
181 static void filelayout_read_prepare(struct rpc_task *task, void *data)
183 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
185 rdata->read_done_cb = filelayout_read_done_cb;
187 if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
188 &rdata->args.seq_args, &rdata->res.seq_res,
189 0, task))
190 return;
192 rpc_call_start(task);
195 static void filelayout_read_call_done(struct rpc_task *task, void *data)
197 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
199 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
201 /* Note this may cause RPC to be resent */
202 rdata->mds_ops->rpc_call_done(task, data);
205 static void filelayout_read_release(void *data)
207 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
209 rdata->mds_ops->rpc_release(data);
212 static int filelayout_write_done_cb(struct rpc_task *task,
213 struct nfs_write_data *data)
215 int reset = 0;
217 if (filelayout_async_handle_error(task, data->args.context->state,
218 data->ds_clp, &reset) == -EAGAIN) {
219 struct nfs_client *clp;
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;
233 filelayout_set_layoutcommit(data);
234 return 0;
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)
240 struct nfs_page *first = nfs_list_entry(data->pages.next);
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 */
248 static int filelayout_commit_done_cb(struct rpc_task *task,
249 struct nfs_write_data *data)
251 int reset = 0;
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;
265 return 0;
268 static void filelayout_write_prepare(struct rpc_task *task, void *data)
270 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
272 if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
273 &wdata->args.seq_args, &wdata->res.seq_res,
274 0, task))
275 return;
277 rpc_call_start(task);
280 static void filelayout_write_call_done(struct rpc_task *task, void *data)
282 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
284 /* Note this may cause RPC to be resent */
285 wdata->mds_ops->rpc_call_done(task, data);
288 static void filelayout_write_release(void *data)
290 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
292 wdata->mds_ops->rpc_release(data);
295 static void filelayout_commit_release(void *data)
297 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
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);
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,
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,
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,
323 static enum pnfs_try_status
324 filelayout_read_pagelist(struct nfs_read_data *data)
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;
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);
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) {
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);
345 return PNFS_NOT_ATTEMPTED;
347 dprintk("%s USE DS:ip %x %hu\n", __func__,
348 ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
350 /* No multipath support. Use first DS */
351 data->ds_clp = ds->ds_clp;
352 fh = nfs4_fl_select_ds_fh(lseg, j);
353 if (fh)
354 data->args.fh = fh;
356 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
357 data->mds_offset = offset;
359 /* Perform an asynchronous read to ds */
360 status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
361 &filelayout_read_call_ops);
362 BUG_ON(status != 0);
363 return PNFS_ATTEMPTED;
366 /* Perform async writes. */
367 static enum pnfs_try_status
368 filelayout_write_pagelist(struct nfs_write_data *data, int sync)
370 struct pnfs_layout_segment *lseg = data->lseg;
371 struct nfs4_pnfs_ds *ds;
372 loff_t offset = data->args.offset;
373 u32 j, idx;
374 struct nfs_fh *fh;
375 int status;
377 /* Retrieve the correct rpc_client for the byte range */
378 j = nfs4_fl_calc_j_index(lseg, offset);
379 idx = nfs4_fl_calc_ds_index(lseg, j);
380 ds = nfs4_fl_prepare_ds(lseg, idx);
381 if (!ds) {
382 printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
383 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
384 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
385 return PNFS_NOT_ATTEMPTED;
387 dprintk("%s ino %lu sync %d req %Zu@%llu DS:%x:%hu\n", __func__,
388 data->inode->i_ino, sync, (size_t) data->args.count, offset,
389 ntohl(ds->ds_ip_addr), ntohs(ds->ds_port));
391 data->write_done_cb = filelayout_write_done_cb;
392 data->ds_clp = ds->ds_clp;
393 fh = nfs4_fl_select_ds_fh(lseg, j);
394 if (fh)
395 data->args.fh = fh;
397 * Get the file offset on the dserver. Set the write offset to
398 * this offset and save the original offset.
400 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
401 data->mds_offset = offset;
403 /* Perform an asynchronous write */
404 status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
405 &filelayout_write_call_ops, sync);
406 BUG_ON(status != 0);
407 return PNFS_ATTEMPTED;
411 * filelayout_check_layout()
413 * Make sure layout segment parameters are sane WRT the device.
414 * At this point no generic layer initialization of the lseg has occurred,
415 * and nothing has been added to the layout_hdr cache.
418 static int
419 filelayout_check_layout(struct pnfs_layout_hdr *lo,
420 struct nfs4_filelayout_segment *fl,
421 struct nfs4_layoutget_res *lgr,
422 struct nfs4_deviceid *id,
423 gfp_t gfp_flags)
425 struct nfs4_deviceid_node *d;
426 struct nfs4_file_layout_dsaddr *dsaddr;
427 int status = -EINVAL;
428 struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
430 dprintk("--> %s\n", __func__);
432 if (fl->pattern_offset > lgr->range.offset) {
433 dprintk("%s pattern_offset %lld too large\n",
434 __func__, fl->pattern_offset);
435 goto out;
438 if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
439 dprintk("%s Invalid stripe unit (%u)\n",
440 __func__, fl->stripe_unit);
441 goto out;
444 /* find and reference the deviceid */
445 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
446 NFS_SERVER(lo->plh_inode)->nfs_client, id);
447 if (d == NULL) {
448 dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
449 if (dsaddr == NULL)
450 goto out;
451 } else
452 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
453 fl->dsaddr = dsaddr;
455 if (fl->first_stripe_index < 0 ||
456 fl->first_stripe_index >= dsaddr->stripe_count) {
457 dprintk("%s Bad first_stripe_index %d\n",
458 __func__, fl->first_stripe_index);
459 goto out_put;
462 if ((fl->stripe_type == STRIPE_SPARSE &&
463 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
464 (fl->stripe_type == STRIPE_DENSE &&
465 fl->num_fh != dsaddr->stripe_count)) {
466 dprintk("%s num_fh %u not valid for given packing\n",
467 __func__, fl->num_fh);
468 goto out_put;
471 if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
472 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
473 "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
474 nfss->wsize);
477 status = 0;
478 out:
479 dprintk("--> %s returns %d\n", __func__, status);
480 return status;
481 out_put:
482 nfs4_fl_put_deviceid(dsaddr);
483 goto out;
486 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
488 int i;
490 for (i = 0; i < fl->num_fh; i++) {
491 if (!fl->fh_array[i])
492 break;
493 kfree(fl->fh_array[i]);
495 kfree(fl->fh_array);
496 fl->fh_array = NULL;
499 static void
500 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
502 filelayout_free_fh_array(fl);
503 kfree(fl);
506 static int
507 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
508 struct nfs4_filelayout_segment *fl,
509 struct nfs4_layoutget_res *lgr,
510 struct nfs4_deviceid *id,
511 gfp_t gfp_flags)
513 struct xdr_stream stream;
514 struct xdr_buf buf;
515 struct page *scratch;
516 __be32 *p;
517 uint32_t nfl_util;
518 int i;
520 dprintk("%s: set_layout_map Begin\n", __func__);
522 scratch = alloc_page(gfp_flags);
523 if (!scratch)
524 return -ENOMEM;
526 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
527 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
529 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
530 * num_fh (4) */
531 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
532 if (unlikely(!p))
533 goto out_err;
535 memcpy(id, p, sizeof(*id));
536 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
537 nfs4_print_deviceid(id);
539 nfl_util = be32_to_cpup(p++);
540 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
541 fl->commit_through_mds = 1;
542 if (nfl_util & NFL4_UFLG_DENSE)
543 fl->stripe_type = STRIPE_DENSE;
544 else
545 fl->stripe_type = STRIPE_SPARSE;
546 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
548 fl->first_stripe_index = be32_to_cpup(p++);
549 p = xdr_decode_hyper(p, &fl->pattern_offset);
550 fl->num_fh = be32_to_cpup(p++);
552 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
553 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
554 fl->pattern_offset);
556 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
557 * Futher checking is done in filelayout_check_layout */
558 if (fl->num_fh < 0 || fl->num_fh >
559 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
560 goto out_err;
562 if (fl->num_fh > 0) {
563 fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
564 gfp_flags);
565 if (!fl->fh_array)
566 goto out_err;
569 for (i = 0; i < fl->num_fh; i++) {
570 /* Do we want to use a mempool here? */
571 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
572 if (!fl->fh_array[i])
573 goto out_err_free;
575 p = xdr_inline_decode(&stream, 4);
576 if (unlikely(!p))
577 goto out_err_free;
578 fl->fh_array[i]->size = be32_to_cpup(p++);
579 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
580 printk(KERN_ERR "Too big fh %d received %d\n",
581 i, fl->fh_array[i]->size);
582 goto out_err_free;
585 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
586 if (unlikely(!p))
587 goto out_err_free;
588 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
589 dprintk("DEBUG: %s: fh len %d\n", __func__,
590 fl->fh_array[i]->size);
593 __free_page(scratch);
594 return 0;
596 out_err_free:
597 filelayout_free_fh_array(fl);
598 out_err:
599 __free_page(scratch);
600 return -EIO;
603 static void
604 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
606 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
608 dprintk("--> %s\n", __func__);
609 nfs4_fl_put_deviceid(fl->dsaddr);
610 kfree(fl->commit_buckets);
611 _filelayout_free_lseg(fl);
614 static struct pnfs_layout_segment *
615 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
616 struct nfs4_layoutget_res *lgr,
617 gfp_t gfp_flags)
619 struct nfs4_filelayout_segment *fl;
620 int rc;
621 struct nfs4_deviceid id;
623 dprintk("--> %s\n", __func__);
624 fl = kzalloc(sizeof(*fl), gfp_flags);
625 if (!fl)
626 return NULL;
628 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
629 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
630 _filelayout_free_lseg(fl);
631 return NULL;
634 /* This assumes there is only one IOMODE_RW lseg. What
635 * we really want to do is have a layout_hdr level
636 * dictionary of <multipath_list4, fh> keys, each
637 * associated with a struct list_head, populated by calls
638 * to filelayout_write_pagelist().
639 * */
640 if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) {
641 int i;
642 int size = (fl->stripe_type == STRIPE_SPARSE) ?
643 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
645 fl->commit_buckets = kcalloc(size, sizeof(struct list_head), gfp_flags);
646 if (!fl->commit_buckets) {
647 filelayout_free_lseg(&fl->generic_hdr);
648 return NULL;
650 fl->number_of_buckets = size;
651 for (i = 0; i < size; i++)
652 INIT_LIST_HEAD(&fl->commit_buckets[i]);
654 return &fl->generic_hdr;
658 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
660 * return true : coalesce page
661 * return false : don't coalesce page
663 bool
664 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
665 struct nfs_page *req)
667 u64 p_stripe, r_stripe;
668 u32 stripe_unit;
670 if (!pnfs_generic_pg_test(pgio, prev, req) ||
671 !nfs_generic_pg_test(pgio, prev, req))
672 return false;
674 if (!pgio->pg_lseg)
675 return 1;
676 p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
677 r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
678 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
680 do_div(p_stripe, stripe_unit);
681 do_div(r_stripe, stripe_unit);
683 return (p_stripe == r_stripe);
686 static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
688 return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
691 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
693 if (fl->stripe_type == STRIPE_SPARSE)
694 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
695 else
696 return j;
699 struct list_head *filelayout_choose_commit_list(struct nfs_page *req)
701 struct pnfs_layout_segment *lseg = req->wb_commit_lseg;
702 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
703 u32 i, j;
704 struct list_head *list;
706 /* Note that we are calling nfs4_fl_calc_j_index on each page
707 * that ends up being committed to a data server. An attractive
708 * alternative is to add a field to nfs_write_data and nfs_page
709 * to store the value calculated in filelayout_write_pagelist
710 * and just use that here.
712 j = nfs4_fl_calc_j_index(lseg,
713 (loff_t)req->wb_index << PAGE_CACHE_SHIFT);
714 i = select_bucket_index(fl, j);
715 list = &fl->commit_buckets[i];
716 if (list_empty(list)) {
717 /* Non-empty buckets hold a reference on the lseg */
718 get_lseg(lseg);
720 return list;
723 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
725 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
727 if (flseg->stripe_type == STRIPE_SPARSE)
728 return i;
729 else
730 return nfs4_fl_calc_ds_index(lseg, i);
733 static struct nfs_fh *
734 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
736 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
738 if (flseg->stripe_type == STRIPE_SPARSE) {
739 if (flseg->num_fh == 1)
740 i = 0;
741 else if (flseg->num_fh == 0)
742 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
743 return NULL;
745 return flseg->fh_array[i];
748 static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
750 struct pnfs_layout_segment *lseg = data->lseg;
751 struct nfs4_pnfs_ds *ds;
752 u32 idx;
753 struct nfs_fh *fh;
755 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
756 ds = nfs4_fl_prepare_ds(lseg, idx);
757 if (!ds) {
758 printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
759 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
760 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
761 prepare_to_resend_writes(data);
762 data->mds_ops->rpc_release(data);
763 return -EAGAIN;
765 dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
766 data->write_done_cb = filelayout_commit_done_cb;
767 data->ds_clp = ds->ds_clp;
768 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
769 if (fh)
770 data->args.fh = fh;
771 return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
772 &filelayout_commit_call_ops, how);
776 * This is only useful while we are using whole file layouts.
778 static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
780 struct pnfs_layout_segment *lseg, *rv = NULL;
782 spin_lock(&inode->i_lock);
783 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
784 if (lseg->pls_range.iomode == IOMODE_RW)
785 rv = get_lseg(lseg);
786 spin_unlock(&inode->i_lock);
787 return rv;
790 static int alloc_ds_commits(struct inode *inode, struct list_head *list)
792 struct pnfs_layout_segment *lseg;
793 struct nfs4_filelayout_segment *fl;
794 struct nfs_write_data *data;
795 int i, j;
797 /* Won't need this when non-whole file layout segments are supported
798 * instead we will use a pnfs_layout_hdr structure */
799 lseg = find_only_write_lseg(inode);
800 if (!lseg)
801 return 0;
802 fl = FILELAYOUT_LSEG(lseg);
803 for (i = 0; i < fl->number_of_buckets; i++) {
804 if (list_empty(&fl->commit_buckets[i]))
805 continue;
806 data = nfs_commitdata_alloc();
807 if (!data)
808 goto out_bad;
809 data->ds_commit_index = i;
810 data->lseg = lseg;
811 list_add(&data->pages, list);
813 put_lseg(lseg);
814 return 0;
816 out_bad:
817 for (j = i; j < fl->number_of_buckets; j++) {
818 if (list_empty(&fl->commit_buckets[i]))
819 continue;
820 nfs_retry_commit(&fl->commit_buckets[i], lseg);
821 put_lseg(lseg); /* associated with emptying bucket */
823 put_lseg(lseg);
824 /* Caller will clean up entries put on list */
825 return -ENOMEM;
828 /* This follows nfs_commit_list pretty closely */
829 static int
830 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
831 int how)
833 struct nfs_write_data *data, *tmp;
834 LIST_HEAD(list);
836 if (!list_empty(mds_pages)) {
837 data = nfs_commitdata_alloc();
838 if (!data)
839 goto out_bad;
840 data->lseg = NULL;
841 list_add(&data->pages, &list);
844 if (alloc_ds_commits(inode, &list))
845 goto out_bad;
847 list_for_each_entry_safe(data, tmp, &list, pages) {
848 list_del_init(&data->pages);
849 atomic_inc(&NFS_I(inode)->commits_outstanding);
850 if (!data->lseg) {
851 nfs_init_commit(data, mds_pages, NULL);
852 nfs_initiate_commit(data, NFS_CLIENT(inode),
853 data->mds_ops, how);
854 } else {
855 nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg);
856 filelayout_initiate_commit(data, how);
859 return 0;
860 out_bad:
861 list_for_each_entry_safe(data, tmp, &list, pages) {
862 nfs_retry_commit(&data->pages, data->lseg);
863 list_del_init(&data->pages);
864 nfs_commit_free(data);
866 nfs_retry_commit(mds_pages, NULL);
867 nfs_commit_clear_lock(NFS_I(inode));
868 return -ENOMEM;
871 static void
872 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
874 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
877 static struct pnfs_layoutdriver_type filelayout_type = {
878 .id = LAYOUT_NFSV4_1_FILES,
879 .name = "LAYOUT_NFSV4_1_FILES",
880 .owner = THIS_MODULE,
881 .alloc_lseg = filelayout_alloc_lseg,
882 .free_lseg = filelayout_free_lseg,
883 .pg_test = filelayout_pg_test,
884 .mark_pnfs_commit = filelayout_mark_pnfs_commit,
885 .choose_commit_list = filelayout_choose_commit_list,
886 .commit_pagelist = filelayout_commit_pagelist,
887 .read_pagelist = filelayout_read_pagelist,
888 .write_pagelist = filelayout_write_pagelist,
889 .free_deviceid_node = filelayout_free_deveiceid_node,
892 static int __init nfs4filelayout_init(void)
894 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
895 __func__);
896 return pnfs_register_layoutdriver(&filelayout_type);
899 static void __exit nfs4filelayout_exit(void)
901 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
902 __func__);
903 pnfs_unregister_layoutdriver(&filelayout_type);
906 module_init(nfs4filelayout_init);
907 module_exit(nfs4filelayout_exit);