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>
39 #include "delegation.h"
40 #include "nfs4filelayout.h"
42 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
44 MODULE_LICENSE("GPL");
45 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
46 MODULE_DESCRIPTION("The NFSv4 file layout driver");
48 #define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
51 filelayout_get_dense_offset(struct nfs4_filelayout_segment
*flseg
,
54 u32 stripe_width
= flseg
->stripe_unit
* flseg
->dsaddr
->stripe_count
;
58 offset
-= flseg
->pattern_offset
;
59 stripe_no
= div_u64(offset
, stripe_width
);
60 div_u64_rem(offset
, flseg
->stripe_unit
, &rem
);
62 return stripe_no
* flseg
->stripe_unit
+ rem
;
65 /* This function is used by the layout driver to calculate the
66 * offset of the file on the dserver based on whether the
67 * layout type is STRIPE_DENSE or STRIPE_SPARSE
70 filelayout_get_dserver_offset(struct pnfs_layout_segment
*lseg
, loff_t offset
)
72 struct nfs4_filelayout_segment
*flseg
= FILELAYOUT_LSEG(lseg
);
74 switch (flseg
->stripe_type
) {
79 return filelayout_get_dense_offset(flseg
, offset
);
85 static int filelayout_async_handle_error(struct rpc_task
*task
,
86 struct nfs4_state
*state
,
87 struct nfs_client
*clp
,
90 struct nfs_server
*mds_server
= NFS_SERVER(state
->inode
);
91 struct nfs_client
*mds_client
= mds_server
->nfs_client
;
93 if (task
->tk_status
>= 0)
97 switch (task
->tk_status
) {
98 /* MDS state errors */
99 case -NFS4ERR_DELEG_REVOKED
:
100 case -NFS4ERR_ADMIN_REVOKED
:
101 case -NFS4ERR_BAD_STATEID
:
102 nfs_remove_bad_delegation(state
->inode
);
103 case -NFS4ERR_OPENMODE
:
104 nfs4_schedule_stateid_recovery(mds_server
, state
);
105 goto wait_on_recovery
;
106 case -NFS4ERR_EXPIRED
:
107 nfs4_schedule_stateid_recovery(mds_server
, state
);
108 nfs4_schedule_lease_recovery(mds_client
);
109 goto wait_on_recovery
;
110 /* DS session errors */
111 case -NFS4ERR_BADSESSION
:
112 case -NFS4ERR_BADSLOT
:
113 case -NFS4ERR_BAD_HIGH_SLOT
:
114 case -NFS4ERR_DEADSESSION
:
115 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
116 case -NFS4ERR_SEQ_FALSE_RETRY
:
117 case -NFS4ERR_SEQ_MISORDERED
:
118 dprintk("%s ERROR %d, Reset session. Exchangeid "
119 "flags 0x%x\n", __func__
, task
->tk_status
,
120 clp
->cl_exchange_flags
);
121 nfs4_schedule_session_recovery(clp
->cl_session
);
126 rpc_delay(task
, FILELAYOUT_POLL_RETRY_MAX
);
128 case -NFS4ERR_RETRY_UNCACHED_REP
:
131 dprintk("%s DS error. Retry through MDS %d\n", __func__
,
140 rpc_sleep_on(&mds_client
->cl_rpcwaitq
, task
, NULL
);
141 if (test_bit(NFS4CLNT_MANAGER_RUNNING
, &mds_client
->cl_state
) == 0)
142 rpc_wake_up_queued_task(&mds_client
->cl_rpcwaitq
, task
);
146 /* NFS_PROTO call done callback routines */
148 static int filelayout_read_done_cb(struct rpc_task
*task
,
149 struct nfs_read_data
*data
)
153 dprintk("%s DS read\n", __func__
);
155 if (filelayout_async_handle_error(task
, data
->args
.context
->state
,
156 data
->ds_clp
, &reset
) == -EAGAIN
) {
157 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
158 __func__
, data
->ds_clp
, data
->ds_clp
->cl_session
);
160 pnfs_set_lo_fail(data
->lseg
);
161 nfs4_reset_read(task
, data
);
163 rpc_restart_call_prepare(task
);
171 * We reference the rpc_cred of the first WRITE that triggers the need for
172 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
173 * rfc5661 is not clear about which credential should be used.
176 filelayout_set_layoutcommit(struct nfs_write_data
*wdata
)
178 if (FILELAYOUT_LSEG(wdata
->lseg
)->commit_through_mds
||
179 wdata
->res
.verf
->committed
== NFS_FILE_SYNC
)
182 pnfs_set_layoutcommit(wdata
);
183 dprintk("%s ionde %lu pls_end_pos %lu\n", __func__
, wdata
->inode
->i_ino
,
184 (unsigned long) NFS_I(wdata
->inode
)->layout
->plh_lwb
);
188 * Call ops for the async read/write cases
189 * In the case of dense layouts, the offset needs to be reset to its
192 static void filelayout_read_prepare(struct rpc_task
*task
, void *data
)
194 struct nfs_read_data
*rdata
= (struct nfs_read_data
*)data
;
196 rdata
->read_done_cb
= filelayout_read_done_cb
;
198 if (nfs41_setup_sequence(rdata
->ds_clp
->cl_session
,
199 &rdata
->args
.seq_args
, &rdata
->res
.seq_res
,
203 rpc_call_start(task
);
206 static void filelayout_read_call_done(struct rpc_task
*task
, void *data
)
208 struct nfs_read_data
*rdata
= (struct nfs_read_data
*)data
;
210 dprintk("--> %s task->tk_status %d\n", __func__
, task
->tk_status
);
212 /* Note this may cause RPC to be resent */
213 rdata
->mds_ops
->rpc_call_done(task
, data
);
216 static void filelayout_read_count_stats(struct rpc_task
*task
, void *data
)
218 struct nfs_read_data
*rdata
= (struct nfs_read_data
*)data
;
220 rpc_count_iostats(task
, NFS_SERVER(rdata
->inode
)->client
->cl_metrics
);
223 static void filelayout_read_release(void *data
)
225 struct nfs_read_data
*rdata
= (struct nfs_read_data
*)data
;
227 put_lseg(rdata
->lseg
);
228 rdata
->mds_ops
->rpc_release(data
);
231 static int filelayout_write_done_cb(struct rpc_task
*task
,
232 struct nfs_write_data
*data
)
236 if (filelayout_async_handle_error(task
, data
->args
.context
->state
,
237 data
->ds_clp
, &reset
) == -EAGAIN
) {
238 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
239 __func__
, data
->ds_clp
, data
->ds_clp
->cl_session
);
241 pnfs_set_lo_fail(data
->lseg
);
242 nfs4_reset_write(task
, data
);
244 rpc_restart_call_prepare(task
);
248 filelayout_set_layoutcommit(data
);
252 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
253 static void prepare_to_resend_writes(struct nfs_write_data
*data
)
255 struct nfs_page
*first
= nfs_list_entry(data
->pages
.next
);
257 data
->task
.tk_status
= 0;
258 memcpy(data
->verf
.verifier
, first
->wb_verf
.verifier
,
259 sizeof(first
->wb_verf
.verifier
));
260 data
->verf
.verifier
[0]++; /* ensure verifier mismatch */
263 static int filelayout_commit_done_cb(struct rpc_task
*task
,
264 struct nfs_write_data
*data
)
268 if (filelayout_async_handle_error(task
, data
->args
.context
->state
,
269 data
->ds_clp
, &reset
) == -EAGAIN
) {
270 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
271 __func__
, data
->ds_clp
, data
->ds_clp
->cl_session
);
273 prepare_to_resend_writes(data
);
274 pnfs_set_lo_fail(data
->lseg
);
276 rpc_restart_call_prepare(task
);
283 static void filelayout_write_prepare(struct rpc_task
*task
, void *data
)
285 struct nfs_write_data
*wdata
= (struct nfs_write_data
*)data
;
287 if (nfs41_setup_sequence(wdata
->ds_clp
->cl_session
,
288 &wdata
->args
.seq_args
, &wdata
->res
.seq_res
,
292 rpc_call_start(task
);
295 static void filelayout_write_call_done(struct rpc_task
*task
, void *data
)
297 struct nfs_write_data
*wdata
= (struct nfs_write_data
*)data
;
299 /* Note this may cause RPC to be resent */
300 wdata
->mds_ops
->rpc_call_done(task
, data
);
303 static void filelayout_write_count_stats(struct rpc_task
*task
, void *data
)
305 struct nfs_write_data
*wdata
= (struct nfs_write_data
*)data
;
307 rpc_count_iostats(task
, NFS_SERVER(wdata
->inode
)->client
->cl_metrics
);
310 static void filelayout_write_release(void *data
)
312 struct nfs_write_data
*wdata
= (struct nfs_write_data
*)data
;
314 put_lseg(wdata
->lseg
);
315 wdata
->mds_ops
->rpc_release(data
);
318 static void filelayout_commit_release(void *data
)
320 struct nfs_write_data
*wdata
= (struct nfs_write_data
*)data
;
322 nfs_commit_release_pages(wdata
);
323 if (atomic_dec_and_test(&NFS_I(wdata
->inode
)->commits_outstanding
))
324 nfs_commit_clear_lock(NFS_I(wdata
->inode
));
325 put_lseg(wdata
->lseg
);
326 nfs_commitdata_release(wdata
);
329 static const struct rpc_call_ops filelayout_read_call_ops
= {
330 .rpc_call_prepare
= filelayout_read_prepare
,
331 .rpc_call_done
= filelayout_read_call_done
,
332 .rpc_count_stats
= filelayout_read_count_stats
,
333 .rpc_release
= filelayout_read_release
,
336 static const struct rpc_call_ops filelayout_write_call_ops
= {
337 .rpc_call_prepare
= filelayout_write_prepare
,
338 .rpc_call_done
= filelayout_write_call_done
,
339 .rpc_count_stats
= filelayout_write_count_stats
,
340 .rpc_release
= filelayout_write_release
,
343 static const struct rpc_call_ops filelayout_commit_call_ops
= {
344 .rpc_call_prepare
= filelayout_write_prepare
,
345 .rpc_call_done
= filelayout_write_call_done
,
346 .rpc_count_stats
= filelayout_write_count_stats
,
347 .rpc_release
= filelayout_commit_release
,
350 static enum pnfs_try_status
351 filelayout_read_pagelist(struct nfs_read_data
*data
)
353 struct pnfs_layout_segment
*lseg
= data
->lseg
;
354 struct nfs4_pnfs_ds
*ds
;
355 loff_t offset
= data
->args
.offset
;
360 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
361 __func__
, data
->inode
->i_ino
,
362 data
->args
.pgbase
, (size_t)data
->args
.count
, offset
);
364 if (test_bit(NFS_DEVICEID_INVALID
, &FILELAYOUT_DEVID_NODE(lseg
)->flags
))
365 return PNFS_NOT_ATTEMPTED
;
367 /* Retrieve the correct rpc_client for the byte range */
368 j
= nfs4_fl_calc_j_index(lseg
, offset
);
369 idx
= nfs4_fl_calc_ds_index(lseg
, j
);
370 ds
= nfs4_fl_prepare_ds(lseg
, idx
);
372 /* Either layout fh index faulty, or ds connect failed */
373 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
374 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
375 return PNFS_NOT_ATTEMPTED
;
377 dprintk("%s USE DS: %s\n", __func__
, ds
->ds_remotestr
);
379 /* No multipath support. Use first DS */
380 data
->ds_clp
= ds
->ds_clp
;
381 fh
= nfs4_fl_select_ds_fh(lseg
, j
);
385 data
->args
.offset
= filelayout_get_dserver_offset(lseg
, offset
);
386 data
->mds_offset
= offset
;
388 /* Perform an asynchronous read to ds */
389 status
= nfs_initiate_read(data
, ds
->ds_clp
->cl_rpcclient
,
390 &filelayout_read_call_ops
);
392 return PNFS_ATTEMPTED
;
395 /* Perform async writes. */
396 static enum pnfs_try_status
397 filelayout_write_pagelist(struct nfs_write_data
*data
, int sync
)
399 struct pnfs_layout_segment
*lseg
= data
->lseg
;
400 struct nfs4_pnfs_ds
*ds
;
401 loff_t offset
= data
->args
.offset
;
406 if (test_bit(NFS_DEVICEID_INVALID
, &FILELAYOUT_DEVID_NODE(lseg
)->flags
))
407 return PNFS_NOT_ATTEMPTED
;
409 /* Retrieve the correct rpc_client for the byte range */
410 j
= nfs4_fl_calc_j_index(lseg
, offset
);
411 idx
= nfs4_fl_calc_ds_index(lseg
, j
);
412 ds
= nfs4_fl_prepare_ds(lseg
, idx
);
414 printk(KERN_ERR
"NFS: %s: prepare_ds failed, use MDS\n",
416 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
417 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
418 return PNFS_NOT_ATTEMPTED
;
420 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__
,
421 data
->inode
->i_ino
, sync
, (size_t) data
->args
.count
, offset
,
424 data
->write_done_cb
= filelayout_write_done_cb
;
425 data
->ds_clp
= ds
->ds_clp
;
426 fh
= nfs4_fl_select_ds_fh(lseg
, j
);
430 * Get the file offset on the dserver. Set the write offset to
431 * this offset and save the original offset.
433 data
->args
.offset
= filelayout_get_dserver_offset(lseg
, offset
);
435 /* Perform an asynchronous write */
436 status
= nfs_initiate_write(data
, ds
->ds_clp
->cl_rpcclient
,
437 &filelayout_write_call_ops
, sync
);
439 return PNFS_ATTEMPTED
;
443 * filelayout_check_layout()
445 * Make sure layout segment parameters are sane WRT the device.
446 * At this point no generic layer initialization of the lseg has occurred,
447 * and nothing has been added to the layout_hdr cache.
451 filelayout_check_layout(struct pnfs_layout_hdr
*lo
,
452 struct nfs4_filelayout_segment
*fl
,
453 struct nfs4_layoutget_res
*lgr
,
454 struct nfs4_deviceid
*id
,
457 struct nfs4_deviceid_node
*d
;
458 struct nfs4_file_layout_dsaddr
*dsaddr
;
459 int status
= -EINVAL
;
460 struct nfs_server
*nfss
= NFS_SERVER(lo
->plh_inode
);
462 dprintk("--> %s\n", __func__
);
464 /* FIXME: remove this check when layout segment support is added */
465 if (lgr
->range
.offset
!= 0 ||
466 lgr
->range
.length
!= NFS4_MAX_UINT64
) {
467 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
472 if (fl
->pattern_offset
> lgr
->range
.offset
) {
473 dprintk("%s pattern_offset %lld too large\n",
474 __func__
, fl
->pattern_offset
);
478 if (!fl
->stripe_unit
|| fl
->stripe_unit
% PAGE_SIZE
) {
479 dprintk("%s Invalid stripe unit (%u)\n",
480 __func__
, fl
->stripe_unit
);
484 /* find and reference the deviceid */
485 d
= nfs4_find_get_deviceid(NFS_SERVER(lo
->plh_inode
)->pnfs_curr_ld
,
486 NFS_SERVER(lo
->plh_inode
)->nfs_client
, id
);
488 dsaddr
= get_device_info(lo
->plh_inode
, id
, gfp_flags
);
492 dsaddr
= container_of(d
, struct nfs4_file_layout_dsaddr
, id_node
);
493 /* Found deviceid is being reaped */
494 if (test_bit(NFS_DEVICEID_INVALID
, &dsaddr
->id_node
.flags
))
499 if (fl
->first_stripe_index
>= dsaddr
->stripe_count
) {
500 dprintk("%s Bad first_stripe_index %u\n",
501 __func__
, fl
->first_stripe_index
);
505 if ((fl
->stripe_type
== STRIPE_SPARSE
&&
506 fl
->num_fh
> 1 && fl
->num_fh
!= dsaddr
->ds_num
) ||
507 (fl
->stripe_type
== STRIPE_DENSE
&&
508 fl
->num_fh
!= dsaddr
->stripe_count
)) {
509 dprintk("%s num_fh %u not valid for given packing\n",
510 __func__
, fl
->num_fh
);
514 if (fl
->stripe_unit
% nfss
->rsize
|| fl
->stripe_unit
% nfss
->wsize
) {
515 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
516 "wsize %u\n", __func__
, fl
->stripe_unit
, nfss
->rsize
,
522 dprintk("--> %s returns %d\n", __func__
, status
);
525 nfs4_fl_put_deviceid(dsaddr
);
529 static void filelayout_free_fh_array(struct nfs4_filelayout_segment
*fl
)
533 for (i
= 0; i
< fl
->num_fh
; i
++) {
534 if (!fl
->fh_array
[i
])
536 kfree(fl
->fh_array
[i
]);
543 _filelayout_free_lseg(struct nfs4_filelayout_segment
*fl
)
545 filelayout_free_fh_array(fl
);
550 filelayout_decode_layout(struct pnfs_layout_hdr
*flo
,
551 struct nfs4_filelayout_segment
*fl
,
552 struct nfs4_layoutget_res
*lgr
,
553 struct nfs4_deviceid
*id
,
556 struct xdr_stream stream
;
558 struct page
*scratch
;
563 dprintk("%s: set_layout_map Begin\n", __func__
);
565 scratch
= alloc_page(gfp_flags
);
569 xdr_init_decode_pages(&stream
, &buf
, lgr
->layoutp
->pages
, lgr
->layoutp
->len
);
570 xdr_set_scratch_buffer(&stream
, page_address(scratch
), PAGE_SIZE
);
572 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
574 p
= xdr_inline_decode(&stream
, NFS4_DEVICEID4_SIZE
+ 20);
578 memcpy(id
, p
, sizeof(*id
));
579 p
+= XDR_QUADLEN(NFS4_DEVICEID4_SIZE
);
580 nfs4_print_deviceid(id
);
582 nfl_util
= be32_to_cpup(p
++);
583 if (nfl_util
& NFL4_UFLG_COMMIT_THRU_MDS
)
584 fl
->commit_through_mds
= 1;
585 if (nfl_util
& NFL4_UFLG_DENSE
)
586 fl
->stripe_type
= STRIPE_DENSE
;
588 fl
->stripe_type
= STRIPE_SPARSE
;
589 fl
->stripe_unit
= nfl_util
& ~NFL4_UFLG_MASK
;
591 fl
->first_stripe_index
= be32_to_cpup(p
++);
592 p
= xdr_decode_hyper(p
, &fl
->pattern_offset
);
593 fl
->num_fh
= be32_to_cpup(p
++);
595 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
596 __func__
, nfl_util
, fl
->num_fh
, fl
->first_stripe_index
,
599 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
600 * Futher checking is done in filelayout_check_layout */
602 max(NFS4_PNFS_MAX_STRIPE_CNT
, NFS4_PNFS_MAX_MULTI_CNT
))
605 if (fl
->num_fh
> 0) {
606 fl
->fh_array
= kzalloc(fl
->num_fh
* sizeof(struct nfs_fh
*),
612 for (i
= 0; i
< fl
->num_fh
; i
++) {
613 /* Do we want to use a mempool here? */
614 fl
->fh_array
[i
] = kmalloc(sizeof(struct nfs_fh
), gfp_flags
);
615 if (!fl
->fh_array
[i
])
618 p
= xdr_inline_decode(&stream
, 4);
621 fl
->fh_array
[i
]->size
= be32_to_cpup(p
++);
622 if (sizeof(struct nfs_fh
) < fl
->fh_array
[i
]->size
) {
623 printk(KERN_ERR
"NFS: Too big fh %d received %d\n",
624 i
, fl
->fh_array
[i
]->size
);
628 p
= xdr_inline_decode(&stream
, fl
->fh_array
[i
]->size
);
631 memcpy(fl
->fh_array
[i
]->data
, p
, fl
->fh_array
[i
]->size
);
632 dprintk("DEBUG: %s: fh len %d\n", __func__
,
633 fl
->fh_array
[i
]->size
);
636 __free_page(scratch
);
640 filelayout_free_fh_array(fl
);
642 __free_page(scratch
);
647 filelayout_free_lseg(struct pnfs_layout_segment
*lseg
)
649 struct nfs4_filelayout_segment
*fl
= FILELAYOUT_LSEG(lseg
);
651 dprintk("--> %s\n", __func__
);
652 nfs4_fl_put_deviceid(fl
->dsaddr
);
653 kfree(fl
->commit_buckets
);
654 _filelayout_free_lseg(fl
);
657 static struct pnfs_layout_segment
*
658 filelayout_alloc_lseg(struct pnfs_layout_hdr
*layoutid
,
659 struct nfs4_layoutget_res
*lgr
,
662 struct nfs4_filelayout_segment
*fl
;
664 struct nfs4_deviceid id
;
666 dprintk("--> %s\n", __func__
);
667 fl
= kzalloc(sizeof(*fl
), gfp_flags
);
671 rc
= filelayout_decode_layout(layoutid
, fl
, lgr
, &id
, gfp_flags
);
672 if (rc
!= 0 || filelayout_check_layout(layoutid
, fl
, lgr
, &id
, gfp_flags
)) {
673 _filelayout_free_lseg(fl
);
677 /* This assumes there is only one IOMODE_RW lseg. What
678 * we really want to do is have a layout_hdr level
679 * dictionary of <multipath_list4, fh> keys, each
680 * associated with a struct list_head, populated by calls
681 * to filelayout_write_pagelist().
683 if ((!fl
->commit_through_mds
) && (lgr
->range
.iomode
== IOMODE_RW
)) {
685 int size
= (fl
->stripe_type
== STRIPE_SPARSE
) ?
686 fl
->dsaddr
->ds_num
: fl
->dsaddr
->stripe_count
;
688 fl
->commit_buckets
= kcalloc(size
, sizeof(struct nfs4_fl_commit_bucket
), gfp_flags
);
689 if (!fl
->commit_buckets
) {
690 filelayout_free_lseg(&fl
->generic_hdr
);
693 fl
->number_of_buckets
= size
;
694 for (i
= 0; i
< size
; i
++) {
695 INIT_LIST_HEAD(&fl
->commit_buckets
[i
].written
);
696 INIT_LIST_HEAD(&fl
->commit_buckets
[i
].committing
);
699 return &fl
->generic_hdr
;
703 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
705 * return true : coalesce page
706 * return false : don't coalesce page
709 filelayout_pg_test(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
710 struct nfs_page
*req
)
712 u64 p_stripe
, r_stripe
;
715 if (!pnfs_generic_pg_test(pgio
, prev
, req
) ||
716 !nfs_generic_pg_test(pgio
, prev
, req
))
719 p_stripe
= (u64
)prev
->wb_index
<< PAGE_CACHE_SHIFT
;
720 r_stripe
= (u64
)req
->wb_index
<< PAGE_CACHE_SHIFT
;
721 stripe_unit
= FILELAYOUT_LSEG(pgio
->pg_lseg
)->stripe_unit
;
723 do_div(p_stripe
, stripe_unit
);
724 do_div(r_stripe
, stripe_unit
);
726 return (p_stripe
== r_stripe
);
730 filelayout_pg_init_read(struct nfs_pageio_descriptor
*pgio
,
731 struct nfs_page
*req
)
733 BUG_ON(pgio
->pg_lseg
!= NULL
);
735 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
741 /* If no lseg, fall back to read through mds */
742 if (pgio
->pg_lseg
== NULL
)
743 nfs_pageio_reset_read_mds(pgio
);
747 filelayout_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
748 struct nfs_page
*req
)
750 BUG_ON(pgio
->pg_lseg
!= NULL
);
752 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
758 /* If no lseg, fall back to write through mds */
759 if (pgio
->pg_lseg
== NULL
)
760 nfs_pageio_reset_write_mds(pgio
);
763 static const struct nfs_pageio_ops filelayout_pg_read_ops
= {
764 .pg_init
= filelayout_pg_init_read
,
765 .pg_test
= filelayout_pg_test
,
766 .pg_doio
= pnfs_generic_pg_readpages
,
769 static const struct nfs_pageio_ops filelayout_pg_write_ops
= {
770 .pg_init
= filelayout_pg_init_write
,
771 .pg_test
= filelayout_pg_test
,
772 .pg_doio
= pnfs_generic_pg_writepages
,
775 static u32
select_bucket_index(struct nfs4_filelayout_segment
*fl
, u32 j
)
777 if (fl
->stripe_type
== STRIPE_SPARSE
)
778 return nfs4_fl_calc_ds_index(&fl
->generic_hdr
, j
);
783 /* The generic layer is about to remove the req from the commit list.
784 * If this will make the bucket empty, it will need to put the lseg reference.
787 filelayout_clear_request_commit(struct nfs_page
*req
)
789 struct pnfs_layout_segment
*freeme
= NULL
;
790 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
792 spin_lock(&inode
->i_lock
);
793 if (!test_and_clear_bit(PG_COMMIT_TO_DS
, &req
->wb_flags
))
795 if (list_is_singular(&req
->wb_list
)) {
796 struct inode
*inode
= req
->wb_context
->dentry
->d_inode
;
797 struct pnfs_layout_segment
*lseg
;
799 /* From here we can find the bucket, but for the moment,
800 * since there is only one relevant lseg...
802 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
803 if (lseg
->pls_range
.iomode
== IOMODE_RW
) {
810 nfs_request_remove_commit_list(req
);
811 spin_unlock(&inode
->i_lock
);
815 static struct list_head
*
816 filelayout_choose_commit_list(struct nfs_page
*req
,
817 struct pnfs_layout_segment
*lseg
)
819 struct nfs4_filelayout_segment
*fl
= FILELAYOUT_LSEG(lseg
);
821 struct list_head
*list
;
823 if (fl
->commit_through_mds
)
824 return &NFS_I(req
->wb_context
->dentry
->d_inode
)->commit_list
;
826 /* Note that we are calling nfs4_fl_calc_j_index on each page
827 * that ends up being committed to a data server. An attractive
828 * alternative is to add a field to nfs_write_data and nfs_page
829 * to store the value calculated in filelayout_write_pagelist
830 * and just use that here.
832 j
= nfs4_fl_calc_j_index(lseg
,
833 (loff_t
)req
->wb_index
<< PAGE_CACHE_SHIFT
);
834 i
= select_bucket_index(fl
, j
);
835 list
= &fl
->commit_buckets
[i
].written
;
836 if (list_empty(list
)) {
837 /* Non-empty buckets hold a reference on the lseg. That ref
838 * is normally transferred to the COMMIT call and released
839 * there. It could also be released if the last req is pulled
840 * off due to a rewrite, in which case it will be done in
841 * filelayout_remove_commit_req
845 set_bit(PG_COMMIT_TO_DS
, &req
->wb_flags
);
850 filelayout_mark_request_commit(struct nfs_page
*req
,
851 struct pnfs_layout_segment
*lseg
)
853 struct list_head
*list
;
855 list
= filelayout_choose_commit_list(req
, lseg
);
856 nfs_request_add_commit_list(req
, list
);
859 static u32
calc_ds_index_from_commit(struct pnfs_layout_segment
*lseg
, u32 i
)
861 struct nfs4_filelayout_segment
*flseg
= FILELAYOUT_LSEG(lseg
);
863 if (flseg
->stripe_type
== STRIPE_SPARSE
)
866 return nfs4_fl_calc_ds_index(lseg
, i
);
869 static struct nfs_fh
*
870 select_ds_fh_from_commit(struct pnfs_layout_segment
*lseg
, u32 i
)
872 struct nfs4_filelayout_segment
*flseg
= FILELAYOUT_LSEG(lseg
);
874 if (flseg
->stripe_type
== STRIPE_SPARSE
) {
875 if (flseg
->num_fh
== 1)
877 else if (flseg
->num_fh
== 0)
878 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
881 return flseg
->fh_array
[i
];
884 static int filelayout_initiate_commit(struct nfs_write_data
*data
, int how
)
886 struct pnfs_layout_segment
*lseg
= data
->lseg
;
887 struct nfs4_pnfs_ds
*ds
;
891 idx
= calc_ds_index_from_commit(lseg
, data
->ds_commit_index
);
892 ds
= nfs4_fl_prepare_ds(lseg
, idx
);
894 printk(KERN_ERR
"NFS: %s: prepare_ds failed, use MDS\n",
896 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
897 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
898 prepare_to_resend_writes(data
);
899 filelayout_commit_release(data
);
902 dprintk("%s ino %lu, how %d\n", __func__
, data
->inode
->i_ino
, how
);
903 data
->write_done_cb
= filelayout_commit_done_cb
;
904 data
->ds_clp
= ds
->ds_clp
;
905 fh
= select_ds_fh_from_commit(lseg
, data
->ds_commit_index
);
908 return nfs_initiate_commit(data
, ds
->ds_clp
->cl_rpcclient
,
909 &filelayout_commit_call_ops
, how
);
913 * This is only useful while we are using whole file layouts.
915 static struct pnfs_layout_segment
*
916 find_only_write_lseg_locked(struct inode
*inode
)
918 struct pnfs_layout_segment
*lseg
;
920 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
)
921 if (lseg
->pls_range
.iomode
== IOMODE_RW
)
926 static struct pnfs_layout_segment
*find_only_write_lseg(struct inode
*inode
)
928 struct pnfs_layout_segment
*rv
;
930 spin_lock(&inode
->i_lock
);
931 rv
= find_only_write_lseg_locked(inode
);
934 spin_unlock(&inode
->i_lock
);
939 filelayout_scan_ds_commit_list(struct nfs4_fl_commit_bucket
*bucket
, int max
,
942 struct list_head
*src
= &bucket
->written
;
943 struct list_head
*dst
= &bucket
->committing
;
944 struct nfs_page
*req
, *tmp
;
947 list_for_each_entry_safe(req
, tmp
, src
, wb_list
) {
948 if (!nfs_lock_request(req
))
950 if (cond_resched_lock(lock
))
951 list_safe_reset_next(req
, tmp
, wb_list
);
952 nfs_request_remove_commit_list(req
);
953 clear_bit(PG_COMMIT_TO_DS
, &req
->wb_flags
);
954 nfs_list_add_request(req
, dst
);
962 /* Move reqs from written to committing lists, returning count of number moved.
963 * Note called with i_lock held.
965 static int filelayout_scan_commit_lists(struct inode
*inode
, int max
,
968 struct pnfs_layout_segment
*lseg
;
969 struct nfs4_filelayout_segment
*fl
;
972 lseg
= find_only_write_lseg_locked(inode
);
975 fl
= FILELAYOUT_LSEG(lseg
);
976 if (fl
->commit_through_mds
)
978 for (i
= 0; i
< fl
->number_of_buckets
&& max
!= 0; i
++) {
979 cnt
= filelayout_scan_ds_commit_list(&fl
->commit_buckets
[i
],
989 alloc_ds_commits(struct inode
*inode
, struct list_head
*list
)
991 struct pnfs_layout_segment
*lseg
;
992 struct nfs4_filelayout_segment
*fl
;
993 struct nfs_write_data
*data
;
995 unsigned int nreq
= 0;
997 /* Won't need this when non-whole file layout segments are supported
998 * instead we will use a pnfs_layout_hdr structure */
999 lseg
= find_only_write_lseg(inode
);
1002 fl
= FILELAYOUT_LSEG(lseg
);
1003 for (i
= 0; i
< fl
->number_of_buckets
; i
++) {
1004 if (list_empty(&fl
->commit_buckets
[i
].committing
))
1006 data
= nfs_commitdata_alloc();
1009 data
->ds_commit_index
= i
;
1011 list_add(&data
->pages
, list
);
1015 /* Clean up on error */
1016 for (j
= i
; j
< fl
->number_of_buckets
; j
++) {
1017 if (list_empty(&fl
->commit_buckets
[i
].committing
))
1019 nfs_retry_commit(&fl
->commit_buckets
[i
].committing
, lseg
);
1020 put_lseg(lseg
); /* associated with emptying bucket */
1023 /* Caller will clean up entries put on list */
1027 /* This follows nfs_commit_list pretty closely */
1029 filelayout_commit_pagelist(struct inode
*inode
, struct list_head
*mds_pages
,
1032 struct nfs_write_data
*data
, *tmp
;
1034 unsigned int nreq
= 0;
1036 if (!list_empty(mds_pages
)) {
1037 data
= nfs_commitdata_alloc();
1040 list_add(&data
->pages
, &list
);
1043 nfs_retry_commit(mds_pages
, NULL
);
1046 nreq
+= alloc_ds_commits(inode
, &list
);
1049 nfs_commit_clear_lock(NFS_I(inode
));
1053 atomic_add(nreq
, &NFS_I(inode
)->commits_outstanding
);
1055 list_for_each_entry_safe(data
, tmp
, &list
, pages
) {
1056 list_del_init(&data
->pages
);
1058 nfs_init_commit(data
, mds_pages
, NULL
);
1059 nfs_initiate_commit(data
, NFS_CLIENT(inode
),
1060 data
->mds_ops
, how
);
1062 nfs_init_commit(data
, &FILELAYOUT_LSEG(data
->lseg
)->commit_buckets
[data
->ds_commit_index
].committing
, data
->lseg
);
1063 filelayout_initiate_commit(data
, how
);
1067 return PNFS_ATTEMPTED
;
1071 filelayout_free_deveiceid_node(struct nfs4_deviceid_node
*d
)
1073 nfs4_fl_free_deviceid(container_of(d
, struct nfs4_file_layout_dsaddr
, id_node
));
1076 static struct pnfs_layoutdriver_type filelayout_type
= {
1077 .id
= LAYOUT_NFSV4_1_FILES
,
1078 .name
= "LAYOUT_NFSV4_1_FILES",
1079 .owner
= THIS_MODULE
,
1080 .alloc_lseg
= filelayout_alloc_lseg
,
1081 .free_lseg
= filelayout_free_lseg
,
1082 .pg_read_ops
= &filelayout_pg_read_ops
,
1083 .pg_write_ops
= &filelayout_pg_write_ops
,
1084 .mark_request_commit
= filelayout_mark_request_commit
,
1085 .clear_request_commit
= filelayout_clear_request_commit
,
1086 .scan_commit_lists
= filelayout_scan_commit_lists
,
1087 .commit_pagelist
= filelayout_commit_pagelist
,
1088 .read_pagelist
= filelayout_read_pagelist
,
1089 .write_pagelist
= filelayout_write_pagelist
,
1090 .free_deviceid_node
= filelayout_free_deveiceid_node
,
1093 static int __init
nfs4filelayout_init(void)
1095 printk(KERN_INFO
"%s: NFSv4 File Layout Driver Registering...\n",
1097 return pnfs_register_layoutdriver(&filelayout_type
);
1100 static void __exit
nfs4filelayout_exit(void)
1102 printk(KERN_INFO
"%s: NFSv4 File Layout Driver Unregistering...\n",
1104 pnfs_unregister_layoutdriver(&filelayout_type
);
1107 MODULE_ALIAS("nfs-layouttype4-1");
1109 module_init(nfs4filelayout_init
);
1110 module_exit(nfs4filelayout_exit
);