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>
37 #include "nfs4filelayout.h"
39 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
41 MODULE_LICENSE("GPL");
42 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
43 MODULE_DESCRIPTION("The NFSv4 file layout driver");
45 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
48 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
51 u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
54 offset -= flseg->pattern_offset;
56 do_div(tmp, stripe_width);
58 return tmp * flseg->stripe_unit + do_div(offset, flseg->stripe_unit);
61 /* This function is used by the layout driver to calculate the
62 * offset of the file on the dserver based on whether the
63 * layout type is STRIPE_DENSE or STRIPE_SPARSE
66 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
68 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
70 switch (flseg->stripe_type) {
75 return filelayout_get_dense_offset(flseg, offset);
81 static int filelayout_async_handle_error(struct rpc_task *task,
82 struct nfs4_state *state,
83 struct nfs_client *clp,
86 if (task->tk_status >= 0)
91 switch (task->tk_status) {
92 case -NFS4ERR_BADSESSION:
93 case -NFS4ERR_BADSLOT:
94 case -NFS4ERR_BAD_HIGH_SLOT:
95 case -NFS4ERR_DEADSESSION:
96 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
97 case -NFS4ERR_SEQ_FALSE_RETRY:
98 case -NFS4ERR_SEQ_MISORDERED:
99 dprintk("%s ERROR %d, Reset session. Exchangeid "
100 "flags 0x%x\n", __func__, task->tk_status,
101 clp->cl_exchange_flags);
102 nfs4_schedule_session_recovery(clp->cl_session);
107 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
109 case -NFS4ERR_RETRY_UNCACHED_REP:
112 dprintk("%s DS error. Retry through MDS %d\n", __func__,
121 /* NFS_PROTO call done callback routines */
123 static int filelayout_read_done_cb(struct rpc_task *task,
124 struct nfs_read_data *data)
128 dprintk("%s DS read\n", __func__);
130 if (filelayout_async_handle_error(task, data->args.context->state,
131 data->ds_clp, &reset) == -EAGAIN) {
132 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
133 __func__, data->ds_clp, data->ds_clp->cl_session);
135 pnfs_set_lo_fail(data->lseg);
136 nfs4_reset_read(task, data);
138 rpc_restart_call_prepare(task);
146 * We reference the rpc_cred of the first WRITE that triggers the need for
147 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
148 * rfc5661 is not clear about which credential should be used.
151 filelayout_set_layoutcommit(struct nfs_write_data *wdata)
153 if (FILELAYOUT_LSEG(wdata->lseg)->commit_through_mds ||
154 wdata->res.verf->committed == NFS_FILE_SYNC)
157 pnfs_set_layoutcommit(wdata);
158 dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, wdata->inode->i_ino,
159 (unsigned long) NFS_I(wdata->inode)->layout->plh_lwb);
163 * Call ops for the async read/write cases
164 * In the case of dense layouts, the offset needs to be reset to its
167 static void filelayout_read_prepare(struct rpc_task *task, void *data)
169 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
171 rdata->read_done_cb = filelayout_read_done_cb;
173 if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
174 &rdata->args.seq_args, &rdata->res.seq_res,
178 rpc_call_start(task);
181 static void filelayout_read_call_done(struct rpc_task *task, void *data)
183 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
185 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
187 /* Note this may cause RPC to be resent */
188 rdata->mds_ops->rpc_call_done(task, data);
191 static void filelayout_read_release(void *data)
193 struct nfs_read_data *rdata = (struct nfs_read_data *)data;
195 rdata->mds_ops->rpc_release(data);
198 static int filelayout_write_done_cb(struct rpc_task *task,
199 struct nfs_write_data *data)
203 if (filelayout_async_handle_error(task, data->args.context->state,
204 data->ds_clp, &reset) == -EAGAIN) {
205 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
206 __func__, data->ds_clp, data->ds_clp->cl_session);
208 pnfs_set_lo_fail(data->lseg);
209 nfs4_reset_write(task, data);
211 rpc_restart_call_prepare(task);
215 filelayout_set_layoutcommit(data);
219 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
220 static void prepare_to_resend_writes(struct nfs_write_data *data)
222 struct nfs_page *first = nfs_list_entry(data->pages.next);
224 data->task.tk_status = 0;
225 memcpy(data->verf.verifier, first->wb_verf.verifier,
226 sizeof(first->wb_verf.verifier));
227 data->verf.verifier[0]++; /* ensure verifier mismatch */
230 static int filelayout_commit_done_cb(struct rpc_task *task,
231 struct nfs_write_data *data)
235 if (filelayout_async_handle_error(task, data->args.context->state,
236 data->ds_clp, &reset) == -EAGAIN) {
237 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
238 __func__, data->ds_clp, data->ds_clp->cl_session);
240 prepare_to_resend_writes(data);
241 pnfs_set_lo_fail(data->lseg);
243 rpc_restart_call_prepare(task);
250 static void filelayout_write_prepare(struct rpc_task *task, void *data)
252 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
254 if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
255 &wdata->args.seq_args, &wdata->res.seq_res,
259 rpc_call_start(task);
262 static void filelayout_write_call_done(struct rpc_task *task, void *data)
264 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
266 /* Note this may cause RPC to be resent */
267 wdata->mds_ops->rpc_call_done(task, data);
270 static void filelayout_write_release(void *data)
272 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
274 wdata->mds_ops->rpc_release(data);
277 static void filelayout_commit_release(void *data)
279 struct nfs_write_data *wdata = (struct nfs_write_data *)data;
281 nfs_commit_release_pages(wdata);
282 if (atomic_dec_and_test(&NFS_I(wdata->inode)->commits_outstanding))
283 nfs_commit_clear_lock(NFS_I(wdata->inode));
284 nfs_commitdata_release(wdata);
287 struct rpc_call_ops filelayout_read_call_ops = {
288 .rpc_call_prepare = filelayout_read_prepare,
289 .rpc_call_done = filelayout_read_call_done,
290 .rpc_release = filelayout_read_release,
293 struct rpc_call_ops filelayout_write_call_ops = {
294 .rpc_call_prepare = filelayout_write_prepare,
295 .rpc_call_done = filelayout_write_call_done,
296 .rpc_release = filelayout_write_release,
299 struct rpc_call_ops filelayout_commit_call_ops = {
300 .rpc_call_prepare = filelayout_write_prepare,
301 .rpc_call_done = filelayout_write_call_done,
302 .rpc_release = filelayout_commit_release,
305 static enum pnfs_try_status
306 filelayout_read_pagelist(struct nfs_read_data *data)
308 struct pnfs_layout_segment *lseg = data->lseg;
309 struct nfs4_pnfs_ds *ds;
310 loff_t offset = data->args.offset;
315 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
316 __func__, data->inode->i_ino,
317 data->args.pgbase, (size_t)data->args.count, offset);
319 if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
320 return PNFS_NOT_ATTEMPTED;
322 /* Retrieve the correct rpc_client for the byte range */
323 j = nfs4_fl_calc_j_index(lseg, offset);
324 idx = nfs4_fl_calc_ds_index(lseg, j);
325 ds = nfs4_fl_prepare_ds(lseg, idx);
327 /* Either layout fh index faulty, or ds connect failed */
328 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
329 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
330 return PNFS_NOT_ATTEMPTED;
332 dprintk("%s USE DS: %s\n", __func__, ds->ds_remotestr);
334 /* No multipath support. Use first DS */
335 data->ds_clp = ds->ds_clp;
336 fh = nfs4_fl_select_ds_fh(lseg, j);
340 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
341 data->mds_offset = offset;
343 /* Perform an asynchronous read to ds */
344 status = nfs_initiate_read(data, ds->ds_clp->cl_rpcclient,
345 &filelayout_read_call_ops);
347 return PNFS_ATTEMPTED;
350 /* Perform async writes. */
351 static enum pnfs_try_status
352 filelayout_write_pagelist(struct nfs_write_data *data, int sync)
354 struct pnfs_layout_segment *lseg = data->lseg;
355 struct nfs4_pnfs_ds *ds;
356 loff_t offset = data->args.offset;
361 if (test_bit(NFS_DEVICEID_INVALID, &FILELAYOUT_DEVID_NODE(lseg)->flags))
362 return PNFS_NOT_ATTEMPTED;
364 /* Retrieve the correct rpc_client for the byte range */
365 j = nfs4_fl_calc_j_index(lseg, offset);
366 idx = nfs4_fl_calc_ds_index(lseg, j);
367 ds = nfs4_fl_prepare_ds(lseg, idx);
369 printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
370 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
371 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
372 return PNFS_NOT_ATTEMPTED;
374 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__,
375 data->inode->i_ino, sync, (size_t) data->args.count, offset,
378 data->write_done_cb = filelayout_write_done_cb;
379 data->ds_clp = ds->ds_clp;
380 fh = nfs4_fl_select_ds_fh(lseg, j);
384 * Get the file offset on the dserver. Set the write offset to
385 * this offset and save the original offset.
387 data->args.offset = filelayout_get_dserver_offset(lseg, offset);
389 /* Perform an asynchronous write */
390 status = nfs_initiate_write(data, ds->ds_clp->cl_rpcclient,
391 &filelayout_write_call_ops, sync);
393 return PNFS_ATTEMPTED;
397 * filelayout_check_layout()
399 * Make sure layout segment parameters are sane WRT the device.
400 * At this point no generic layer initialization of the lseg has occurred,
401 * and nothing has been added to the layout_hdr cache.
405 filelayout_check_layout(struct pnfs_layout_hdr *lo,
406 struct nfs4_filelayout_segment *fl,
407 struct nfs4_layoutget_res *lgr,
408 struct nfs4_deviceid *id,
411 struct nfs4_deviceid_node *d;
412 struct nfs4_file_layout_dsaddr *dsaddr;
413 int status = -EINVAL;
414 struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
416 dprintk("--> %s\n", __func__);
418 /* FIXME: remove this check when layout segment support is added */
419 if (lgr->range.offset != 0 ||
420 lgr->range.length != NFS4_MAX_UINT64) {
421 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
426 if (fl->pattern_offset > lgr->range.offset) {
427 dprintk("%s pattern_offset %lld too large\n",
428 __func__, fl->pattern_offset);
432 if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
433 dprintk("%s Invalid stripe unit (%u)\n",
434 __func__, fl->stripe_unit);
438 /* find and reference the deviceid */
439 d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
440 NFS_SERVER(lo->plh_inode)->nfs_client, id);
442 dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
446 dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
447 /* Found deviceid is being reaped */
448 if (test_bit(NFS_DEVICEID_INVALID, &dsaddr->id_node.flags))
453 if (fl->first_stripe_index >= dsaddr->stripe_count) {
454 dprintk("%s Bad first_stripe_index %u\n",
455 __func__, fl->first_stripe_index);
459 if ((fl->stripe_type == STRIPE_SPARSE &&
460 fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
461 (fl->stripe_type == STRIPE_DENSE &&
462 fl->num_fh != dsaddr->stripe_count)) {
463 dprintk("%s num_fh %u not valid for given packing\n",
464 __func__, fl->num_fh);
468 if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
469 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
470 "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
476 dprintk("--> %s returns %d\n", __func__, status);
479 nfs4_fl_put_deviceid(dsaddr);
483 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
487 for (i = 0; i < fl->num_fh; i++) {
488 if (!fl->fh_array[i])
490 kfree(fl->fh_array[i]);
497 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
499 filelayout_free_fh_array(fl);
504 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
505 struct nfs4_filelayout_segment *fl,
506 struct nfs4_layoutget_res *lgr,
507 struct nfs4_deviceid *id,
510 struct xdr_stream stream;
512 struct page *scratch;
517 dprintk("%s: set_layout_map Begin\n", __func__);
519 scratch = alloc_page(gfp_flags);
523 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
524 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
526 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
528 p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
532 memcpy(id, p, sizeof(*id));
533 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
534 nfs4_print_deviceid(id);
536 nfl_util = be32_to_cpup(p++);
537 if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
538 fl->commit_through_mds = 1;
539 if (nfl_util & NFL4_UFLG_DENSE)
540 fl->stripe_type = STRIPE_DENSE;
542 fl->stripe_type = STRIPE_SPARSE;
543 fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
545 fl->first_stripe_index = be32_to_cpup(p++);
546 p = xdr_decode_hyper(p, &fl->pattern_offset);
547 fl->num_fh = be32_to_cpup(p++);
549 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
550 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
553 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
554 * Futher checking is done in filelayout_check_layout */
556 max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
559 if (fl->num_fh > 0) {
560 fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
566 for (i = 0; i < fl->num_fh; i++) {
567 /* Do we want to use a mempool here? */
568 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
569 if (!fl->fh_array[i])
572 p = xdr_inline_decode(&stream, 4);
575 fl->fh_array[i]->size = be32_to_cpup(p++);
576 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
577 printk(KERN_ERR "Too big fh %d received %d\n",
578 i, fl->fh_array[i]->size);
582 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
585 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
586 dprintk("DEBUG: %s: fh len %d\n", __func__,
587 fl->fh_array[i]->size);
590 __free_page(scratch);
594 filelayout_free_fh_array(fl);
596 __free_page(scratch);
601 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
603 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
605 dprintk("--> %s\n", __func__);
606 nfs4_fl_put_deviceid(fl->dsaddr);
607 kfree(fl->commit_buckets);
608 _filelayout_free_lseg(fl);
611 static struct pnfs_layout_segment *
612 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
613 struct nfs4_layoutget_res *lgr,
616 struct nfs4_filelayout_segment *fl;
618 struct nfs4_deviceid id;
620 dprintk("--> %s\n", __func__);
621 fl = kzalloc(sizeof(*fl), gfp_flags);
625 rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
626 if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
627 _filelayout_free_lseg(fl);
631 /* This assumes there is only one IOMODE_RW lseg. What
632 * we really want to do is have a layout_hdr level
633 * dictionary of <multipath_list4, fh> keys, each
634 * associated with a struct list_head, populated by calls
635 * to filelayout_write_pagelist().
637 if ((!fl->commit_through_mds) && (lgr->range.iomode == IOMODE_RW)) {
639 int size = (fl->stripe_type == STRIPE_SPARSE) ?
640 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
642 fl->commit_buckets = kcalloc(size, sizeof(struct list_head), gfp_flags);
643 if (!fl->commit_buckets) {
644 filelayout_free_lseg(&fl->generic_hdr);
647 fl->number_of_buckets = size;
648 for (i = 0; i < size; i++)
649 INIT_LIST_HEAD(&fl->commit_buckets[i]);
651 return &fl->generic_hdr;
655 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
657 * return true : coalesce page
658 * return false : don't coalesce page
661 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
662 struct nfs_page *req)
664 u64 p_stripe, r_stripe;
667 if (!pnfs_generic_pg_test(pgio, prev, req) ||
668 !nfs_generic_pg_test(pgio, prev, req))
671 p_stripe = (u64)prev->wb_index << PAGE_CACHE_SHIFT;
672 r_stripe = (u64)req->wb_index << PAGE_CACHE_SHIFT;
673 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
675 do_div(p_stripe, stripe_unit);
676 do_div(r_stripe, stripe_unit);
678 return (p_stripe == r_stripe);
682 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
683 struct nfs_page *req)
685 BUG_ON(pgio->pg_lseg != NULL);
687 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
693 /* If no lseg, fall back to read through mds */
694 if (pgio->pg_lseg == NULL)
695 nfs_pageio_reset_read_mds(pgio);
699 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
700 struct nfs_page *req)
702 BUG_ON(pgio->pg_lseg != NULL);
704 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
710 /* If no lseg, fall back to write through mds */
711 if (pgio->pg_lseg == NULL)
712 nfs_pageio_reset_write_mds(pgio);
715 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
716 .pg_init = filelayout_pg_init_read,
717 .pg_test = filelayout_pg_test,
718 .pg_doio = pnfs_generic_pg_readpages,
721 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
722 .pg_init = filelayout_pg_init_write,
723 .pg_test = filelayout_pg_test,
724 .pg_doio = pnfs_generic_pg_writepages,
727 static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
729 return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
732 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
734 if (fl->stripe_type == STRIPE_SPARSE)
735 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
740 struct list_head *filelayout_choose_commit_list(struct nfs_page *req)
742 struct pnfs_layout_segment *lseg = req->wb_commit_lseg;
743 struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
745 struct list_head *list;
747 /* Note that we are calling nfs4_fl_calc_j_index on each page
748 * that ends up being committed to a data server. An attractive
749 * alternative is to add a field to nfs_write_data and nfs_page
750 * to store the value calculated in filelayout_write_pagelist
751 * and just use that here.
753 j = nfs4_fl_calc_j_index(lseg,
754 (loff_t)req->wb_index << PAGE_CACHE_SHIFT);
755 i = select_bucket_index(fl, j);
756 list = &fl->commit_buckets[i];
757 if (list_empty(list)) {
758 /* Non-empty buckets hold a reference on the lseg */
764 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
766 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
768 if (flseg->stripe_type == STRIPE_SPARSE)
771 return nfs4_fl_calc_ds_index(lseg, i);
774 static struct nfs_fh *
775 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
777 struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
779 if (flseg->stripe_type == STRIPE_SPARSE) {
780 if (flseg->num_fh == 1)
782 else if (flseg->num_fh == 0)
783 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
786 return flseg->fh_array[i];
789 static int filelayout_initiate_commit(struct nfs_write_data *data, int how)
791 struct pnfs_layout_segment *lseg = data->lseg;
792 struct nfs4_pnfs_ds *ds;
796 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
797 ds = nfs4_fl_prepare_ds(lseg, idx);
799 printk(KERN_ERR "%s: prepare_ds failed, use MDS\n", __func__);
800 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags);
801 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags);
802 prepare_to_resend_writes(data);
803 data->mds_ops->rpc_release(data);
806 dprintk("%s ino %lu, how %d\n", __func__, data->inode->i_ino, how);
807 data->write_done_cb = filelayout_commit_done_cb;
808 data->ds_clp = ds->ds_clp;
809 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
812 return nfs_initiate_commit(data, ds->ds_clp->cl_rpcclient,
813 &filelayout_commit_call_ops, how);
817 * This is only useful while we are using whole file layouts.
819 static struct pnfs_layout_segment *find_only_write_lseg(struct inode *inode)
821 struct pnfs_layout_segment *lseg, *rv = NULL;
823 spin_lock(&inode->i_lock);
824 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
825 if (lseg->pls_range.iomode == IOMODE_RW)
827 spin_unlock(&inode->i_lock);
831 static int alloc_ds_commits(struct inode *inode, struct list_head *list)
833 struct pnfs_layout_segment *lseg;
834 struct nfs4_filelayout_segment *fl;
835 struct nfs_write_data *data;
838 /* Won't need this when non-whole file layout segments are supported
839 * instead we will use a pnfs_layout_hdr structure */
840 lseg = find_only_write_lseg(inode);
843 fl = FILELAYOUT_LSEG(lseg);
844 for (i = 0; i < fl->number_of_buckets; i++) {
845 if (list_empty(&fl->commit_buckets[i]))
847 data = nfs_commitdata_alloc();
850 data->ds_commit_index = i;
852 list_add(&data->pages, list);
858 for (j = i; j < fl->number_of_buckets; j++) {
859 if (list_empty(&fl->commit_buckets[i]))
861 nfs_retry_commit(&fl->commit_buckets[i], lseg);
862 put_lseg(lseg); /* associated with emptying bucket */
865 /* Caller will clean up entries put on list */
869 /* This follows nfs_commit_list pretty closely */
871 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
874 struct nfs_write_data *data, *tmp;
877 if (!list_empty(mds_pages)) {
878 data = nfs_commitdata_alloc();
882 list_add(&data->pages, &list);
885 if (alloc_ds_commits(inode, &list))
888 list_for_each_entry_safe(data, tmp, &list, pages) {
889 list_del_init(&data->pages);
890 atomic_inc(&NFS_I(inode)->commits_outstanding);
892 nfs_init_commit(data, mds_pages, NULL);
893 nfs_initiate_commit(data, NFS_CLIENT(inode),
896 nfs_init_commit(data, &FILELAYOUT_LSEG(data->lseg)->commit_buckets[data->ds_commit_index], data->lseg);
897 filelayout_initiate_commit(data, how);
902 list_for_each_entry_safe(data, tmp, &list, pages) {
903 nfs_retry_commit(&data->pages, data->lseg);
904 list_del_init(&data->pages);
905 nfs_commit_free(data);
907 nfs_retry_commit(mds_pages, NULL);
908 nfs_commit_clear_lock(NFS_I(inode));
913 filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
915 nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
918 static struct pnfs_layoutdriver_type filelayout_type = {
919 .id = LAYOUT_NFSV4_1_FILES,
920 .name = "LAYOUT_NFSV4_1_FILES",
921 .owner = THIS_MODULE,
922 .alloc_lseg = filelayout_alloc_lseg,
923 .free_lseg = filelayout_free_lseg,
924 .pg_read_ops = &filelayout_pg_read_ops,
925 .pg_write_ops = &filelayout_pg_write_ops,
926 .mark_pnfs_commit = filelayout_mark_pnfs_commit,
927 .choose_commit_list = filelayout_choose_commit_list,
928 .commit_pagelist = filelayout_commit_pagelist,
929 .read_pagelist = filelayout_read_pagelist,
930 .write_pagelist = filelayout_write_pagelist,
931 .free_deviceid_node = filelayout_free_deveiceid_node,
934 static int __init nfs4filelayout_init(void)
936 printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
938 return pnfs_register_layoutdriver(&filelayout_type);
941 static void __exit nfs4filelayout_exit(void)
943 printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
945 pnfs_unregister_layoutdriver(&filelayout_type);
948 MODULE_ALIAS("nfs-layouttype4-1");
950 module_init(nfs4filelayout_init);
951 module_exit(nfs4filelayout_exit);