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.
7 * The Regents of the University of Michigan
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
32 #include <linux/nfs_fs.h>
33 #include <linux/nfs_page.h>
34 #include <linux/module.h>
36 #include <linux/sunrpc/metrics.h>
38 #include "../nfs4session.h"
39 #include "../internal.h"
40 #include "../delegation.h"
41 #include "filelayout.h"
42 #include "../nfs4trace.h"
44 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
46 MODULE_LICENSE("GPL");
47 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
48 MODULE_DESCRIPTION("The NFSv4 file layout driver");
50 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
53 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
56 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
60 offset -= flseg->pattern_offset;
61 stripe_no = div_u64(offset, stripe_width);
62 div_u64_rem(offset, flseg->stripe_unit, &rem);
64 return stripe_no * flseg->stripe_unit + rem;
67 /* This function is used by the layout driver to calculate the
68 * offset of the file on the dserver based on whether the
69 * layout type is STRIPE_DENSE or STRIPE_SPARSE
72 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
74 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
76 switch (flseg->stripe_type) {
81 return filelayout_get_dense_offset(flseg, offset);
87 static void filelayout_reset_write(struct nfs_pgio_header *hdr)
89 struct rpc_task *task = &hdr->task;
91 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
92 dprintk("%s Reset task %5u for i/o through MDS "
93 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
95 hdr->inode->i_sb->s_id,
96 (unsigned long long)NFS_FILEID(hdr->inode),
98 (unsigned long long)hdr->args.offset);
100 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
104 static void filelayout_reset_read(struct nfs_pgio_header *hdr)
106 struct rpc_task *task = &hdr->task;
108 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
109 dprintk("%s Reset task %5u for i/o through MDS "
110 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
112 hdr->inode->i_sb->s_id,
113 (unsigned long long)NFS_FILEID(hdr->inode),
115 (unsigned long long)hdr->args.offset);
117 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
121 static int filelayout_async_handle_error(struct rpc_task *task,
122 struct nfs4_state *state,
123 struct nfs_client *clp,
124 struct pnfs_layout_segment *lseg)
126 struct pnfs_layout_hdr *lo = lseg->pls_layout;
127 struct inode *inode = lo->plh_inode;
128 struct nfs_server *mds_server = NFS_SERVER(inode);
129 struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
130 struct nfs_client *mds_client = mds_server->nfs_client;
131 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
133 if (task->tk_status >= 0)
136 switch (task->tk_status) {
137 /* MDS state errors */
138 case -NFS4ERR_DELEG_REVOKED:
139 case -NFS4ERR_ADMIN_REVOKED:
140 case -NFS4ERR_BAD_STATEID:
141 case -NFS4ERR_OPENMODE:
144 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
145 goto out_bad_stateid;
146 goto wait_on_recovery;
147 case -NFS4ERR_EXPIRED:
149 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
150 goto out_bad_stateid;
152 nfs4_schedule_lease_recovery(mds_client);
153 goto wait_on_recovery;
154 /* DS session errors */
155 case -NFS4ERR_BADSESSION:
156 case -NFS4ERR_BADSLOT:
157 case -NFS4ERR_BAD_HIGH_SLOT:
158 case -NFS4ERR_DEADSESSION:
159 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
160 case -NFS4ERR_SEQ_FALSE_RETRY:
161 case -NFS4ERR_SEQ_MISORDERED:
162 dprintk("%s ERROR %d, Reset session. Exchangeid "
163 "flags 0x%x\n", __func__, task->tk_status,
164 clp->cl_exchange_flags);
165 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
169 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
171 case -NFS4ERR_RETRY_UNCACHED_REP:
173 /* Invalidate Layout errors */
174 case -NFS4ERR_PNFS_NO_LAYOUT:
175 case -ESTALE: /* mapped NFS4ERR_STALE */
176 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
177 case -EISDIR: /* mapped NFS4ERR_ISDIR */
178 case -NFS4ERR_FHEXPIRED:
179 case -NFS4ERR_WRONG_TYPE:
180 dprintk("%s Invalid layout error %d\n", __func__,
183 * Destroy layout so new i/o will get a new layout.
184 * Layout will not be destroyed until all current lseg
185 * references are put. Mark layout as invalid to resend failed
186 * i/o and all i/o waiting on the slot table to the MDS until
187 * layout is destroyed and a new valid layout is obtained.
189 pnfs_destroy_layout(NFS_I(inode));
190 rpc_wake_up(&tbl->slot_tbl_waitq);
192 /* RPC connection errors */
200 dprintk("%s DS connection error %d\n", __func__,
202 nfs4_mark_deviceid_unavailable(devid);
203 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
204 rpc_wake_up(&tbl->slot_tbl_waitq);
208 dprintk("%s Retry through MDS. Error %d\n", __func__,
210 return -NFS4ERR_RESET_TO_MDS;
216 task->tk_status = -EIO;
219 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
220 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
221 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
225 /* NFS_PROTO call done callback routines */
227 static int filelayout_read_done_cb(struct rpc_task *task,
228 struct nfs_pgio_header *hdr)
232 trace_nfs4_pnfs_read(hdr, task->tk_status);
233 err = filelayout_async_handle_error(task, hdr->args.context->state,
234 hdr->ds_clp, hdr->lseg);
237 case -NFS4ERR_RESET_TO_MDS:
238 filelayout_reset_read(hdr);
239 return task->tk_status;
241 rpc_restart_call_prepare(task);
249 * We reference the rpc_cred of the first WRITE that triggers the need for
250 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
251 * rfc5661 is not clear about which credential should be used.
254 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr)
257 if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
258 hdr->res.verf->committed != NFS_DATA_SYNC)
261 pnfs_set_layoutcommit(hdr);
262 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
263 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
267 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
269 return filelayout_test_devid_invalid(node) ||
270 nfs4_test_deviceid_unavailable(node);
274 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
276 struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
278 return filelayout_test_devid_unavailable(node);
282 * Call ops for the async read/write cases
283 * In the case of dense layouts, the offset needs to be reset to its
286 static void filelayout_read_prepare(struct rpc_task *task, void *data)
288 struct nfs_pgio_header *hdr = data;
290 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
291 rpc_exit(task, -EIO);
294 if (filelayout_reset_to_mds(hdr->lseg)) {
295 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
296 filelayout_reset_read(hdr);
300 hdr->pgio_done_cb = filelayout_read_done_cb;
302 if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
307 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
308 hdr->args.lock_context, FMODE_READ) == -EIO)
309 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
312 static void filelayout_read_call_done(struct rpc_task *task, void *data)
314 struct nfs_pgio_header *hdr = data;
316 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
318 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
319 task->tk_status == 0) {
320 nfs41_sequence_done(task, &hdr->res.seq_res);
324 /* Note this may cause RPC to be resent */
325 hdr->mds_ops->rpc_call_done(task, data);
328 static void filelayout_read_count_stats(struct rpc_task *task, void *data)
330 struct nfs_pgio_header *hdr = data;
332 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
335 static int filelayout_write_done_cb(struct rpc_task *task,
336 struct nfs_pgio_header *hdr)
340 trace_nfs4_pnfs_write(hdr, task->tk_status);
341 err = filelayout_async_handle_error(task, hdr->args.context->state,
342 hdr->ds_clp, hdr->lseg);
345 case -NFS4ERR_RESET_TO_MDS:
346 filelayout_reset_write(hdr);
347 return task->tk_status;
349 rpc_restart_call_prepare(task);
353 filelayout_set_layoutcommit(hdr);
357 static int filelayout_commit_done_cb(struct rpc_task *task,
358 struct nfs_commit_data *data)
362 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
363 err = filelayout_async_handle_error(task, NULL, data->ds_clp,
367 case -NFS4ERR_RESET_TO_MDS:
368 pnfs_generic_prepare_to_resend_writes(data);
371 rpc_restart_call_prepare(task);
375 if (data->verf.committed == NFS_UNSTABLE)
376 pnfs_commit_set_layoutcommit(data);
381 static void filelayout_write_prepare(struct rpc_task *task, void *data)
383 struct nfs_pgio_header *hdr = data;
385 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
386 rpc_exit(task, -EIO);
389 if (filelayout_reset_to_mds(hdr->lseg)) {
390 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
391 filelayout_reset_write(hdr);
395 if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
400 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
401 hdr->args.lock_context, FMODE_WRITE) == -EIO)
402 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
405 static void filelayout_write_call_done(struct rpc_task *task, void *data)
407 struct nfs_pgio_header *hdr = data;
409 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
410 task->tk_status == 0) {
411 nfs41_sequence_done(task, &hdr->res.seq_res);
415 /* Note this may cause RPC to be resent */
416 hdr->mds_ops->rpc_call_done(task, data);
419 static void filelayout_write_count_stats(struct rpc_task *task, void *data)
421 struct nfs_pgio_header *hdr = data;
423 rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
426 static void filelayout_commit_prepare(struct rpc_task *task, void *data)
428 struct nfs_commit_data *wdata = data;
430 nfs41_setup_sequence(wdata->ds_clp->cl_session,
431 &wdata->args.seq_args,
436 static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
438 struct nfs_commit_data *cdata = data;
440 rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
443 static const struct rpc_call_ops filelayout_read_call_ops = {
444 .rpc_call_prepare = filelayout_read_prepare,
445 .rpc_call_done = filelayout_read_call_done,
446 .rpc_count_stats = filelayout_read_count_stats,
447 .rpc_release = pnfs_generic_rw_release,
450 static const struct rpc_call_ops filelayout_write_call_ops = {
451 .rpc_call_prepare = filelayout_write_prepare,
452 .rpc_call_done = filelayout_write_call_done,
453 .rpc_count_stats = filelayout_write_count_stats,
454 .rpc_release = pnfs_generic_rw_release,
457 static const struct rpc_call_ops filelayout_commit_call_ops = {
458 .rpc_call_prepare = filelayout_commit_prepare,
459 .rpc_call_done = pnfs_generic_write_commit_done,
460 .rpc_count_stats = filelayout_commit_count_stats,
461 .rpc_release = pnfs_generic_commit_release,
464 static enum pnfs_try_status
465 filelayout_read_pagelist(struct nfs_pgio_header *hdr)
467 struct pnfs_layout_segment *lseg = hdr->lseg;
468 struct nfs4_pnfs_ds *ds;
469 struct rpc_clnt *ds_clnt;
470 loff_t offset = hdr->args.offset;
474 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
475 __func__, hdr->inode->i_ino,
476 hdr->args.pgbase, (size_t)hdr->args.count, offset);
478 /* Retrieve the correct rpc_client for the byte range */
479 j = nfs4_fl_calc_j_index(lseg, offset);
480 idx = nfs4_fl_calc_ds_index(lseg, j);
481 ds = nfs4_fl_prepare_ds(lseg, idx);
483 return PNFS_NOT_ATTEMPTED;
485 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
487 return PNFS_NOT_ATTEMPTED;
489 dprintk("%s USE DS: %s cl_count %d\n", __func__,
490 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
492 /* No multipath support. Use first DS */
493 atomic_inc(&ds->ds_clp->cl_count);
494 hdr->ds_clp = ds->ds_clp;
496 fh = nfs4_fl_select_ds_fh(lseg, j);
500 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
501 hdr->mds_offset = offset;
503 /* Perform an asynchronous read to ds */
504 nfs_initiate_pgio(ds_clnt, hdr,
505 &filelayout_read_call_ops, 0, RPC_TASK_SOFTCONN);
506 return PNFS_ATTEMPTED;
509 /* Perform async writes. */
510 static enum pnfs_try_status
511 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
513 struct pnfs_layout_segment *lseg = hdr->lseg;
514 struct nfs4_pnfs_ds *ds;
515 struct rpc_clnt *ds_clnt;
516 loff_t offset = hdr->args.offset;
520 /* Retrieve the correct rpc_client for the byte range */
521 j = nfs4_fl_calc_j_index(lseg, offset);
522 idx = nfs4_fl_calc_ds_index(lseg, j);
523 ds = nfs4_fl_prepare_ds(lseg, idx);
525 return PNFS_NOT_ATTEMPTED;
527 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
529 return PNFS_NOT_ATTEMPTED;
531 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
532 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
533 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
535 hdr->pgio_done_cb = filelayout_write_done_cb;
536 atomic_inc(&ds->ds_clp->cl_count);
537 hdr->ds_clp = ds->ds_clp;
539 fh = nfs4_fl_select_ds_fh(lseg, j);
542 hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
544 /* Perform an asynchronous write */
545 nfs_initiate_pgio(ds_clnt, hdr,
546 &filelayout_write_call_ops, sync,
548 return PNFS_ATTEMPTED;
552 * filelayout_check_layout()
554 * Make sure layout segment parameters are sane WRT the device.
555 * At this point no generic layer initialization of the lseg has occurred,
556 * and nothing has been added to the layout_hdr cache.
560 filelayout_check_layout(struct pnfs_layout_hdr *lo,
561 struct nfs4_filelayout_segment *fl,
562 struct nfs4_layoutget_res *lgr,
563 struct nfs4_deviceid *id,
566 struct nfs4_deviceid_node *d;
567 struct nfs4_file_layout_dsaddr *dsaddr;
568 int status = -EINVAL;
570 dprintk("--> %s\n", __func__);
572 /* FIXME: remove this check when layout segment support is added */
573 if (lgr->range.offset != 0 ||
574 lgr->range.length != NFS4_MAX_UINT64) {
575 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
580 if (fl->pattern_offset > lgr->range.offset) {
581 dprintk("%s pattern_offset %lld too large\n",
582 __func__, fl->pattern_offset);
586 if (!fl->stripe_unit) {
587 dprintk("%s Invalid stripe unit (%u)\n",
588 __func__, fl->stripe_unit);
592 /* find and reference the deviceid */
593 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id,
594 lo->plh_lc_cred, gfp_flags);
598 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
599 /* Found deviceid is unavailable */
600 if (filelayout_test_devid_unavailable(&dsaddr->id_node))
605 if (fl->first_stripe_index >= dsaddr->stripe_count) {
606 dprintk("%s Bad first_stripe_index %u\n",
607 __func__, fl->first_stripe_index);
611 if ((fl->stripe_type == STRIPE_SPARSE &&
612 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
613 (fl->stripe_type == STRIPE_DENSE &&
614 fl->num_fh != dsaddr->stripe_count)) {
615 dprintk("%s num_fh %u not valid for given packing\n",
616 __func__, fl->num_fh);
622 dprintk("--> %s returns %d\n", __func__, status);
625 nfs4_fl_put_deviceid(dsaddr);
629 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
633 for (i = 0; i < fl->num_fh; i++) {
634 if (!fl->fh_array[i])
636 kfree(fl->fh_array[i]);
643 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
645 filelayout_free_fh_array(fl);
650 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
651 struct nfs4_filelayout_segment *fl,
652 struct nfs4_layoutget_res *lgr,
653 struct nfs4_deviceid *id,
656 struct xdr_stream stream;
658 struct page *scratch;
663 dprintk("%s: set_layout_map Begin\n", __func__);
665 scratch = alloc_page(gfp_flags);
669 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
670 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
672 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
674 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
678 memcpy(id, p, sizeof(*id));
679 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
680 nfs4_print_deviceid(id);
682 nfl_util = be32_to_cpup(p++);
683 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
684 fl->commit_through_mds = 1;
685 if (nfl_util & NFL4_UFLG_DENSE)
686 fl->stripe_type = STRIPE_DENSE;
688 fl->stripe_type = STRIPE_SPARSE;
689 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
691 fl->first_stripe_index = be32_to_cpup(p++);
692 p = xdr_decode_hyper(p, &fl->pattern_offset);
693 fl->num_fh = be32_to_cpup(p++);
695 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
696 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
699 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
700 * Futher checking is done in filelayout_check_layout */
702 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
705 if (fl->num_fh > 0) {
706 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
712 for (i = 0; i < fl->num_fh; i++) {
713 /* Do we want to use a mempool here? */
714 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
715 if (!fl->fh_array[i])
718 p = xdr_inline_decode(&stream, 4);
721 fl->fh_array[i]->size = be32_to_cpup(p++);
722 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
723 printk(KERN_ERR "NFS: Too big fh %d received %d\n",
724 i, fl->fh_array[i]->size);
728 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
731 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
732 dprintk("DEBUG: %s: fh len %d\n", __func__,
733 fl->fh_array[i]->size);
736 __free_page(scratch);
740 filelayout_free_fh_array(fl);
742 __free_page(scratch);
747 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
749 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
751 dprintk("--> %s\n", __func__);
752 nfs4_fl_put_deviceid(fl->dsaddr);
753 /* This assumes a single RW lseg */
754 if (lseg->pls_range.iomode == IOMODE_RW) {
755 struct nfs4_filelayout *flo;
757 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
758 flo->commit_info.nbuckets = 0;
759 kfree(flo->commit_info.buckets);
760 flo->commit_info.buckets = NULL;
762 _filelayout_free_lseg(fl);
766 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
767 struct nfs_commit_info *cinfo,
770 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
771 struct pnfs_commit_bucket *buckets;
774 if (fl->commit_through_mds)
777 size = (fl->stripe_type == STRIPE_SPARSE) ?
778 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
780 if (cinfo->ds->nbuckets >= size) {
781 /* This assumes there is only one IOMODE_RW lseg. What
782 * we really want to do is have a layout_hdr level
783 * dictionary of <multipath_list4, fh> keys, each
784 * associated with a struct list_head, populated by calls
785 * to filelayout_write_pagelist().
790 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
794 for (i = 0; i < size; i++) {
795 INIT_LIST_HEAD(&buckets[i].written);
796 INIT_LIST_HEAD(&buckets[i].committing);
797 /* mark direct verifier as unset */
798 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
801 spin_lock(cinfo->lock);
802 if (cinfo->ds->nbuckets >= size)
804 for (i = 0; i < cinfo->ds->nbuckets; i++) {
805 list_splice(&cinfo->ds->buckets[i].written,
806 &buckets[i].written);
807 list_splice(&cinfo->ds->buckets[i].committing,
808 &buckets[i].committing);
809 buckets[i].direct_verf.committed =
810 cinfo->ds->buckets[i].direct_verf.committed;
811 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg;
812 buckets[i].clseg = cinfo->ds->buckets[i].clseg;
814 swap(cinfo->ds->buckets, buckets);
815 cinfo->ds->nbuckets = size;
817 spin_unlock(cinfo->lock);
822 static struct pnfs_layout_segment *
823 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
824 struct nfs4_layoutget_res *lgr,
827 struct nfs4_filelayout_segment *fl;
829 struct nfs4_deviceid id;
831 dprintk("--> %s\n", __func__);
832 fl = kzalloc(sizeof(*fl), gfp_flags);
836 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
837 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
838 _filelayout_free_lseg(fl);
841 return &fl->generic_hdr;
845 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
847 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
848 * of bytes (maximum @req->wb_bytes) that can be coalesced.
851 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
852 struct nfs_page *req)
855 u64 p_stripe, r_stripe;
857 u64 segment_offset = pgio->pg_lseg->pls_range.offset;
858 u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
860 /* calls nfs_generic_pg_test */
861 size = pnfs_generic_pg_test(pgio, prev, req);
865 /* see if req and prev are in the same stripe */
867 p_stripe = (u64)req_offset(prev) - segment_offset;
868 r_stripe = (u64)req_offset(req) - segment_offset;
869 do_div(p_stripe, stripe_unit);
870 do_div(r_stripe, stripe_unit);
872 if (p_stripe != r_stripe)
876 /* calculate remaining bytes in the current stripe */
877 div_u64_rem((u64)req_offset(req) - segment_offset,
880 WARN_ON_ONCE(stripe_offset > stripe_unit);
881 if (stripe_offset >= stripe_unit)
883 return min(stripe_unit - (unsigned int)stripe_offset, size);
887 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
888 struct nfs_page *req)
891 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
897 /* If no lseg, fall back to read through mds */
898 if (pgio->pg_lseg == NULL)
899 nfs_pageio_reset_read_mds(pgio);
903 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
904 struct nfs_page *req)
906 struct nfs_commit_info cinfo;
910 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
916 /* If no lseg, fall back to write through mds */
917 if (pgio->pg_lseg == NULL)
919 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
920 status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
922 pnfs_put_lseg(pgio->pg_lseg);
923 pgio->pg_lseg = NULL;
928 nfs_pageio_reset_write_mds(pgio);
931 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
932 .pg_init = filelayout_pg_init_read,
933 .pg_test = filelayout_pg_test,
934 .pg_doio = pnfs_generic_pg_readpages,
937 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
938 .pg_init = filelayout_pg_init_write,
939 .pg_test = filelayout_pg_test,
940 .pg_doio = pnfs_generic_pg_writepages,
943 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
945 if (fl->stripe_type == STRIPE_SPARSE)
946 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
952 filelayout_mark_request_commit(struct nfs_page *req,
953 struct pnfs_layout_segment *lseg,
954 struct nfs_commit_info *cinfo)
957 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
959 struct list_head *list;
960 struct pnfs_commit_bucket *buckets;
962 if (fl->commit_through_mds) {
963 list = &cinfo->mds->list;
964 spin_lock(cinfo->lock);
968 /* Note that we are calling nfs4_fl_calc_j_index on each page
969 * that ends up being committed to a data server. An attractive
970 * alternative is to add a field to nfs_write_data and nfs_page
971 * to store the value calculated in filelayout_write_pagelist
972 * and just use that here.
974 j = nfs4_fl_calc_j_index(lseg, req_offset(req));
975 i = select_bucket_index(fl, j);
976 spin_lock(cinfo->lock);
977 buckets = cinfo->ds->buckets;
978 list = &buckets[i].written;
979 if (list_empty(list)) {
980 /* Non-empty buckets hold a reference on the lseg. That ref
981 * is normally transferred to the COMMIT call and released
982 * there. It could also be released if the last req is pulled
983 * off due to a rewrite, in which case it will be done in
984 * pnfs_generic_clear_request_commit
986 buckets[i].wlseg = pnfs_get_lseg(lseg);
988 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
989 cinfo->ds->nwritten++;
992 /* nfs_request_add_commit_list(). We need to add req to list without
993 * dropping cinfo lock.
995 set_bit(PG_CLEAN, &(req)->wb_flags);
996 nfs_list_add_request(req, list);
997 cinfo->mds->ncommit++;
998 spin_unlock(cinfo->lock);
1000 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1001 inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
1003 __mark_inode_dirty(req->wb_context->dentry->d_inode,
1008 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1010 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1012 if (flseg->stripe_type == STRIPE_SPARSE)
1015 return nfs4_fl_calc_ds_index(lseg, i);
1018 static struct nfs_fh *
1019 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1021 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1023 if (flseg->stripe_type == STRIPE_SPARSE) {
1024 if (flseg->num_fh == 1)
1026 else if (flseg->num_fh == 0)
1027 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1030 return flseg->fh_array[i];
1033 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1035 struct pnfs_layout_segment *lseg = data->lseg;
1036 struct nfs4_pnfs_ds *ds;
1037 struct rpc_clnt *ds_clnt;
1041 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1042 ds = nfs4_fl_prepare_ds(lseg, idx);
1046 ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode);
1047 if (IS_ERR(ds_clnt))
1050 dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1051 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1052 data->commit_done_cb = filelayout_commit_done_cb;
1053 atomic_inc(&ds->ds_clp->cl_count);
1054 data->ds_clp = ds->ds_clp;
1055 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1058 return nfs_initiate_commit(ds_clnt, data,
1059 &filelayout_commit_call_ops, how,
1062 pnfs_generic_prepare_to_resend_writes(data);
1063 pnfs_generic_commit_release(data);
1067 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest
1069 * @cinfo - commit info for current inode
1070 * @page - page to search for matching head request
1072 * Returns a the head request if one is found, otherwise returns NULL.
1074 static struct nfs_page *
1075 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)
1077 struct nfs_page *freq, *t;
1078 struct pnfs_commit_bucket *b;
1081 /* Linearly search the commit lists for each bucket until a matching
1082 * request is found */
1083 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1084 list_for_each_entry_safe(freq, t, &b->written, wb_list) {
1085 if (freq->wb_page == page)
1086 return freq->wb_head;
1088 list_for_each_entry_safe(freq, t, &b->committing, wb_list) {
1089 if (freq->wb_page == page)
1090 return freq->wb_head;
1098 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1099 int how, struct nfs_commit_info *cinfo)
1101 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1102 filelayout_initiate_commit);
1105 static struct nfs4_deviceid_node *
1106 filelayout_alloc_deviceid_node(struct nfs_server *server,
1107 struct pnfs_device *pdev, gfp_t gfp_flags)
1109 struct nfs4_file_layout_dsaddr *dsaddr;
1111 dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags);
1114 return &dsaddr->id_node;
1118 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1120 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1123 static struct pnfs_layout_hdr *
1124 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1126 struct nfs4_filelayout *flo;
1128 flo = kzalloc(sizeof(*flo), gfp_flags);
1129 return flo != NULL ? &flo->generic_hdr : NULL;
1133 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1135 kfree(FILELAYOUT_FROM_HDR(lo));
1138 static struct pnfs_ds_commit_info *
1139 filelayout_get_ds_info(struct inode *inode)
1141 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1146 return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1149 static struct pnfs_layoutdriver_type filelayout_type = {
1150 .id = LAYOUT_NFSV4_1_FILES,
1151 .name = "LAYOUT_NFSV4_1_FILES",
1152 .owner = THIS_MODULE,
1153 .alloc_layout_hdr = filelayout_alloc_layout_hdr,
1154 .free_layout_hdr = filelayout_free_layout_hdr,
1155 .alloc_lseg = filelayout_alloc_lseg,
1156 .free_lseg = filelayout_free_lseg,
1157 .pg_read_ops = &filelayout_pg_read_ops,
1158 .pg_write_ops = &filelayout_pg_write_ops,
1159 .get_ds_info = &filelayout_get_ds_info,
1160 .mark_request_commit = filelayout_mark_request_commit,
1161 .clear_request_commit = pnfs_generic_clear_request_commit,
1162 .scan_commit_lists = pnfs_generic_scan_commit_lists,
1163 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
1164 .search_commit_reqs = filelayout_search_commit_reqs,
1165 .commit_pagelist = filelayout_commit_pagelist,
1166 .read_pagelist = filelayout_read_pagelist,
1167 .write_pagelist = filelayout_write_pagelist,
1168 .alloc_deviceid_node = filelayout_alloc_deviceid_node,
1169 .free_deviceid_node = filelayout_free_deveiceid_node,
1172 static int __init nfs4filelayout_init(void)
1174 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1176 return pnfs_register_layoutdriver(&filelayout_type);
1179 static void __exit nfs4filelayout_exit(void)
1181 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1183 pnfs_unregister_layoutdriver(&filelayout_type);
1186 MODULE_ALIAS("nfs-layouttype4-1");
1188 module_init(nfs4filelayout_init);
1189 module_exit(nfs4filelayout_exit);