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
)
151 struct nfs_pgio_header
*hdr
= data
->header
;
154 dprintk("%s DS read\n", __func__
);
156 if (filelayout_async_handle_error(task
, data
->args
.context
->state
,
157 data
->ds_clp
, &reset
) == -EAGAIN
) {
158 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
159 __func__
, data
->ds_clp
, data
->ds_clp
->cl_session
);
161 pnfs_set_lo_fail(hdr
->lseg
);
162 nfs4_reset_read(task
, data
);
164 rpc_restart_call_prepare(task
);
172 * We reference the rpc_cred of the first WRITE that triggers the need for
173 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
174 * rfc5661 is not clear about which credential should be used.
177 filelayout_set_layoutcommit(struct nfs_write_data
*wdata
)
179 struct nfs_pgio_header
*hdr
= wdata
->header
;
181 if (FILELAYOUT_LSEG(hdr
->lseg
)->commit_through_mds
||
182 wdata
->res
.verf
->committed
== NFS_FILE_SYNC
)
185 pnfs_set_layoutcommit(wdata
);
186 dprintk("%s ionde %lu pls_end_pos %lu\n", __func__
, hdr
->inode
->i_ino
,
187 (unsigned long) NFS_I(hdr
->inode
)->layout
->plh_lwb
);
191 * Call ops for the async read/write cases
192 * In the case of dense layouts, the offset needs to be reset to its
195 static void filelayout_read_prepare(struct rpc_task
*task
, void *data
)
197 struct nfs_read_data
*rdata
= data
;
199 rdata
->read_done_cb
= filelayout_read_done_cb
;
201 if (nfs41_setup_sequence(rdata
->ds_clp
->cl_session
,
202 &rdata
->args
.seq_args
, &rdata
->res
.seq_res
,
206 rpc_call_start(task
);
209 static void filelayout_read_call_done(struct rpc_task
*task
, void *data
)
211 struct nfs_read_data
*rdata
= data
;
213 dprintk("--> %s task->tk_status %d\n", __func__
, task
->tk_status
);
215 /* Note this may cause RPC to be resent */
216 rdata
->header
->mds_ops
->rpc_call_done(task
, data
);
219 static void filelayout_read_count_stats(struct rpc_task
*task
, void *data
)
221 struct nfs_read_data
*rdata
= data
;
223 rpc_count_iostats(task
, NFS_SERVER(rdata
->header
->inode
)->client
->cl_metrics
);
226 static void filelayout_read_release(void *data
)
228 struct nfs_read_data
*rdata
= data
;
230 rdata
->header
->mds_ops
->rpc_release(data
);
233 static int filelayout_write_done_cb(struct rpc_task
*task
,
234 struct nfs_write_data
*data
)
236 struct nfs_pgio_header
*hdr
= data
->header
;
239 if (filelayout_async_handle_error(task
, data
->args
.context
->state
,
240 data
->ds_clp
, &reset
) == -EAGAIN
) {
241 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
242 __func__
, data
->ds_clp
, data
->ds_clp
->cl_session
);
244 pnfs_set_lo_fail(hdr
->lseg
);
245 nfs4_reset_write(task
, data
);
247 rpc_restart_call_prepare(task
);
251 filelayout_set_layoutcommit(data
);
255 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
256 static void prepare_to_resend_writes(struct nfs_commit_data
*data
)
258 struct nfs_page
*first
= nfs_list_entry(data
->pages
.next
);
260 data
->task
.tk_status
= 0;
261 memcpy(data
->verf
.verifier
, first
->wb_verf
.verifier
,
262 sizeof(first
->wb_verf
.verifier
));
263 data
->verf
.verifier
[0]++; /* ensure verifier mismatch */
266 static int filelayout_commit_done_cb(struct rpc_task
*task
,
267 struct nfs_commit_data
*data
)
271 if (filelayout_async_handle_error(task
, data
->context
->state
,
272 data
->ds_clp
, &reset
) == -EAGAIN
) {
273 dprintk("%s calling restart ds_clp %p ds_clp->cl_session %p\n",
274 __func__
, data
->ds_clp
, data
->ds_clp
->cl_session
);
276 prepare_to_resend_writes(data
);
277 pnfs_set_lo_fail(data
->lseg
);
279 rpc_restart_call_prepare(task
);
286 static void filelayout_write_prepare(struct rpc_task
*task
, void *data
)
288 struct nfs_write_data
*wdata
= data
;
290 if (nfs41_setup_sequence(wdata
->ds_clp
->cl_session
,
291 &wdata
->args
.seq_args
, &wdata
->res
.seq_res
,
295 rpc_call_start(task
);
298 static void filelayout_write_call_done(struct rpc_task
*task
, void *data
)
300 struct nfs_write_data
*wdata
= data
;
302 /* Note this may cause RPC to be resent */
303 wdata
->header
->mds_ops
->rpc_call_done(task
, data
);
306 static void filelayout_write_count_stats(struct rpc_task
*task
, void *data
)
308 struct nfs_write_data
*wdata
= data
;
310 rpc_count_iostats(task
, NFS_SERVER(wdata
->header
->inode
)->client
->cl_metrics
);
313 static void filelayout_write_release(void *data
)
315 struct nfs_write_data
*wdata
= data
;
317 wdata
->header
->mds_ops
->rpc_release(data
);
320 static void filelayout_commit_prepare(struct rpc_task
*task
, void *data
)
322 struct nfs_commit_data
*wdata
= data
;
324 if (nfs41_setup_sequence(wdata
->ds_clp
->cl_session
,
325 &wdata
->args
.seq_args
, &wdata
->res
.seq_res
,
329 rpc_call_start(task
);
332 static void filelayout_write_commit_done(struct rpc_task
*task
, void *data
)
334 struct nfs_commit_data
*wdata
= data
;
336 /* Note this may cause RPC to be resent */
337 wdata
->mds_ops
->rpc_call_done(task
, data
);
340 static void filelayout_commit_count_stats(struct rpc_task
*task
, void *data
)
342 struct nfs_commit_data
*cdata
= data
;
344 rpc_count_iostats(task
, NFS_SERVER(cdata
->inode
)->client
->cl_metrics
);
347 static void filelayout_commit_release(void *calldata
)
349 struct nfs_commit_data
*data
= calldata
;
350 struct nfs_commit_info cinfo
;
352 nfs_commit_release_pages(data
);
353 nfs_init_cinfo(&cinfo
, data
->inode
, data
->dreq
);
354 if (atomic_dec_and_test(&cinfo
.mds
->rpcs_out
))
355 nfs_commit_clear_lock(NFS_I(data
->inode
));
356 put_lseg(data
->lseg
);
357 nfs_commitdata_release(data
);
360 static const struct rpc_call_ops filelayout_read_call_ops
= {
361 .rpc_call_prepare
= filelayout_read_prepare
,
362 .rpc_call_done
= filelayout_read_call_done
,
363 .rpc_count_stats
= filelayout_read_count_stats
,
364 .rpc_release
= filelayout_read_release
,
367 static const struct rpc_call_ops filelayout_write_call_ops
= {
368 .rpc_call_prepare
= filelayout_write_prepare
,
369 .rpc_call_done
= filelayout_write_call_done
,
370 .rpc_count_stats
= filelayout_write_count_stats
,
371 .rpc_release
= filelayout_write_release
,
374 static const struct rpc_call_ops filelayout_commit_call_ops
= {
375 .rpc_call_prepare
= filelayout_commit_prepare
,
376 .rpc_call_done
= filelayout_write_commit_done
,
377 .rpc_count_stats
= filelayout_commit_count_stats
,
378 .rpc_release
= filelayout_commit_release
,
381 static enum pnfs_try_status
382 filelayout_read_pagelist(struct nfs_read_data
*data
)
384 struct nfs_pgio_header
*hdr
= data
->header
;
385 struct pnfs_layout_segment
*lseg
= hdr
->lseg
;
386 struct nfs4_pnfs_ds
*ds
;
387 loff_t offset
= data
->args
.offset
;
392 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
393 __func__
, hdr
->inode
->i_ino
,
394 data
->args
.pgbase
, (size_t)data
->args
.count
, offset
);
396 if (test_bit(NFS_DEVICEID_INVALID
, &FILELAYOUT_DEVID_NODE(lseg
)->flags
))
397 return PNFS_NOT_ATTEMPTED
;
399 /* Retrieve the correct rpc_client for the byte range */
400 j
= nfs4_fl_calc_j_index(lseg
, offset
);
401 idx
= nfs4_fl_calc_ds_index(lseg
, j
);
402 ds
= nfs4_fl_prepare_ds(lseg
, idx
);
404 /* Either layout fh index faulty, or ds connect failed */
405 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
406 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
407 return PNFS_NOT_ATTEMPTED
;
409 dprintk("%s USE DS: %s\n", __func__
, ds
->ds_remotestr
);
411 /* No multipath support. Use first DS */
412 data
->ds_clp
= ds
->ds_clp
;
413 fh
= nfs4_fl_select_ds_fh(lseg
, j
);
417 data
->args
.offset
= filelayout_get_dserver_offset(lseg
, offset
);
418 data
->mds_offset
= offset
;
420 /* Perform an asynchronous read to ds */
421 status
= nfs_initiate_read(ds
->ds_clp
->cl_rpcclient
, data
,
422 &filelayout_read_call_ops
);
424 return PNFS_ATTEMPTED
;
427 /* Perform async writes. */
428 static enum pnfs_try_status
429 filelayout_write_pagelist(struct nfs_write_data
*data
, int sync
)
431 struct nfs_pgio_header
*hdr
= data
->header
;
432 struct pnfs_layout_segment
*lseg
= hdr
->lseg
;
433 struct nfs4_pnfs_ds
*ds
;
434 loff_t offset
= data
->args
.offset
;
439 if (test_bit(NFS_DEVICEID_INVALID
, &FILELAYOUT_DEVID_NODE(lseg
)->flags
))
440 return PNFS_NOT_ATTEMPTED
;
442 /* Retrieve the correct rpc_client for the byte range */
443 j
= nfs4_fl_calc_j_index(lseg
, offset
);
444 idx
= nfs4_fl_calc_ds_index(lseg
, j
);
445 ds
= nfs4_fl_prepare_ds(lseg
, idx
);
447 printk(KERN_ERR
"NFS: %s: prepare_ds failed, use MDS\n",
449 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
450 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
451 return PNFS_NOT_ATTEMPTED
;
453 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s\n", __func__
,
454 hdr
->inode
->i_ino
, sync
, (size_t) data
->args
.count
, offset
,
457 data
->write_done_cb
= filelayout_write_done_cb
;
458 data
->ds_clp
= ds
->ds_clp
;
459 fh
= nfs4_fl_select_ds_fh(lseg
, j
);
463 * Get the file offset on the dserver. Set the write offset to
464 * this offset and save the original offset.
466 data
->args
.offset
= filelayout_get_dserver_offset(lseg
, offset
);
468 /* Perform an asynchronous write */
469 status
= nfs_initiate_write(ds
->ds_clp
->cl_rpcclient
, data
,
470 &filelayout_write_call_ops
, sync
);
472 return PNFS_ATTEMPTED
;
476 * filelayout_check_layout()
478 * Make sure layout segment parameters are sane WRT the device.
479 * At this point no generic layer initialization of the lseg has occurred,
480 * and nothing has been added to the layout_hdr cache.
484 filelayout_check_layout(struct pnfs_layout_hdr
*lo
,
485 struct nfs4_filelayout_segment
*fl
,
486 struct nfs4_layoutget_res
*lgr
,
487 struct nfs4_deviceid
*id
,
490 struct nfs4_deviceid_node
*d
;
491 struct nfs4_file_layout_dsaddr
*dsaddr
;
492 int status
= -EINVAL
;
493 struct nfs_server
*nfss
= NFS_SERVER(lo
->plh_inode
);
495 dprintk("--> %s\n", __func__
);
497 /* FIXME: remove this check when layout segment support is added */
498 if (lgr
->range
.offset
!= 0 ||
499 lgr
->range
.length
!= NFS4_MAX_UINT64
) {
500 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
505 if (fl
->pattern_offset
> lgr
->range
.offset
) {
506 dprintk("%s pattern_offset %lld too large\n",
507 __func__
, fl
->pattern_offset
);
511 if (!fl
->stripe_unit
|| fl
->stripe_unit
% PAGE_SIZE
) {
512 dprintk("%s Invalid stripe unit (%u)\n",
513 __func__
, fl
->stripe_unit
);
517 /* find and reference the deviceid */
518 d
= nfs4_find_get_deviceid(NFS_SERVER(lo
->plh_inode
)->pnfs_curr_ld
,
519 NFS_SERVER(lo
->plh_inode
)->nfs_client
, id
);
521 dsaddr
= get_device_info(lo
->plh_inode
, id
, gfp_flags
);
525 dsaddr
= container_of(d
, struct nfs4_file_layout_dsaddr
, id_node
);
526 /* Found deviceid is being reaped */
527 if (test_bit(NFS_DEVICEID_INVALID
, &dsaddr
->id_node
.flags
))
532 if (fl
->first_stripe_index
>= dsaddr
->stripe_count
) {
533 dprintk("%s Bad first_stripe_index %u\n",
534 __func__
, fl
->first_stripe_index
);
538 if ((fl
->stripe_type
== STRIPE_SPARSE
&&
539 fl
->num_fh
> 1 && fl
->num_fh
!= dsaddr
->ds_num
) ||
540 (fl
->stripe_type
== STRIPE_DENSE
&&
541 fl
->num_fh
!= dsaddr
->stripe_count
)) {
542 dprintk("%s num_fh %u not valid for given packing\n",
543 __func__
, fl
->num_fh
);
547 if (fl
->stripe_unit
% nfss
->rsize
|| fl
->stripe_unit
% nfss
->wsize
) {
548 dprintk("%s Stripe unit (%u) not aligned with rsize %u "
549 "wsize %u\n", __func__
, fl
->stripe_unit
, nfss
->rsize
,
555 dprintk("--> %s returns %d\n", __func__
, status
);
558 nfs4_fl_put_deviceid(dsaddr
);
562 static void filelayout_free_fh_array(struct nfs4_filelayout_segment
*fl
)
566 for (i
= 0; i
< fl
->num_fh
; i
++) {
567 if (!fl
->fh_array
[i
])
569 kfree(fl
->fh_array
[i
]);
576 _filelayout_free_lseg(struct nfs4_filelayout_segment
*fl
)
578 filelayout_free_fh_array(fl
);
583 filelayout_decode_layout(struct pnfs_layout_hdr
*flo
,
584 struct nfs4_filelayout_segment
*fl
,
585 struct nfs4_layoutget_res
*lgr
,
586 struct nfs4_deviceid
*id
,
589 struct xdr_stream stream
;
591 struct page
*scratch
;
596 dprintk("%s: set_layout_map Begin\n", __func__
);
598 scratch
= alloc_page(gfp_flags
);
602 xdr_init_decode_pages(&stream
, &buf
, lgr
->layoutp
->pages
, lgr
->layoutp
->len
);
603 xdr_set_scratch_buffer(&stream
, page_address(scratch
), PAGE_SIZE
);
605 /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
607 p
= xdr_inline_decode(&stream
, NFS4_DEVICEID4_SIZE
+ 20);
611 memcpy(id
, p
, sizeof(*id
));
612 p
+= XDR_QUADLEN(NFS4_DEVICEID4_SIZE
);
613 nfs4_print_deviceid(id
);
615 nfl_util
= be32_to_cpup(p
++);
616 if (nfl_util
& NFL4_UFLG_COMMIT_THRU_MDS
)
617 fl
->commit_through_mds
= 1;
618 if (nfl_util
& NFL4_UFLG_DENSE
)
619 fl
->stripe_type
= STRIPE_DENSE
;
621 fl
->stripe_type
= STRIPE_SPARSE
;
622 fl
->stripe_unit
= nfl_util
& ~NFL4_UFLG_MASK
;
624 fl
->first_stripe_index
= be32_to_cpup(p
++);
625 p
= xdr_decode_hyper(p
, &fl
->pattern_offset
);
626 fl
->num_fh
= be32_to_cpup(p
++);
628 dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
629 __func__
, nfl_util
, fl
->num_fh
, fl
->first_stripe_index
,
632 /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
633 * Futher checking is done in filelayout_check_layout */
635 max(NFS4_PNFS_MAX_STRIPE_CNT
, NFS4_PNFS_MAX_MULTI_CNT
))
638 if (fl
->num_fh
> 0) {
639 fl
->fh_array
= kzalloc(fl
->num_fh
* sizeof(struct nfs_fh
*),
645 for (i
= 0; i
< fl
->num_fh
; i
++) {
646 /* Do we want to use a mempool here? */
647 fl
->fh_array
[i
] = kmalloc(sizeof(struct nfs_fh
), gfp_flags
);
648 if (!fl
->fh_array
[i
])
651 p
= xdr_inline_decode(&stream
, 4);
654 fl
->fh_array
[i
]->size
= be32_to_cpup(p
++);
655 if (sizeof(struct nfs_fh
) < fl
->fh_array
[i
]->size
) {
656 printk(KERN_ERR
"NFS: Too big fh %d received %d\n",
657 i
, fl
->fh_array
[i
]->size
);
661 p
= xdr_inline_decode(&stream
, fl
->fh_array
[i
]->size
);
664 memcpy(fl
->fh_array
[i
]->data
, p
, fl
->fh_array
[i
]->size
);
665 dprintk("DEBUG: %s: fh len %d\n", __func__
,
666 fl
->fh_array
[i
]->size
);
669 __free_page(scratch
);
673 filelayout_free_fh_array(fl
);
675 __free_page(scratch
);
680 filelayout_free_lseg(struct pnfs_layout_segment
*lseg
)
682 struct nfs4_filelayout_segment
*fl
= FILELAYOUT_LSEG(lseg
);
684 dprintk("--> %s\n", __func__
);
685 nfs4_fl_put_deviceid(fl
->dsaddr
);
686 /* This assumes a single RW lseg */
687 if (lseg
->pls_range
.iomode
== IOMODE_RW
) {
688 struct nfs4_filelayout
*flo
;
690 flo
= FILELAYOUT_FROM_HDR(lseg
->pls_layout
);
691 flo
->commit_info
.nbuckets
= 0;
692 kfree(flo
->commit_info
.buckets
);
693 flo
->commit_info
.buckets
= NULL
;
695 _filelayout_free_lseg(fl
);
699 filelayout_alloc_commit_info(struct pnfs_layout_segment
*lseg
,
700 struct nfs_commit_info
*cinfo
,
703 struct nfs4_filelayout_segment
*fl
= FILELAYOUT_LSEG(lseg
);
704 struct pnfs_commit_bucket
*buckets
;
707 if (fl
->commit_through_mds
)
709 if (cinfo
->ds
->nbuckets
!= 0) {
710 /* This assumes there is only one IOMODE_RW lseg. What
711 * we really want to do is have a layout_hdr level
712 * dictionary of <multipath_list4, fh> keys, each
713 * associated with a struct list_head, populated by calls
714 * to filelayout_write_pagelist().
719 size
= (fl
->stripe_type
== STRIPE_SPARSE
) ?
720 fl
->dsaddr
->ds_num
: fl
->dsaddr
->stripe_count
;
722 buckets
= kcalloc(size
, sizeof(struct pnfs_commit_bucket
),
729 spin_lock(cinfo
->lock
);
730 if (cinfo
->ds
->nbuckets
!= 0)
733 cinfo
->ds
->buckets
= buckets
;
734 cinfo
->ds
->nbuckets
= size
;
735 for (i
= 0; i
< size
; i
++) {
736 INIT_LIST_HEAD(&buckets
[i
].written
);
737 INIT_LIST_HEAD(&buckets
[i
].committing
);
740 spin_unlock(cinfo
->lock
);
745 static struct pnfs_layout_segment
*
746 filelayout_alloc_lseg(struct pnfs_layout_hdr
*layoutid
,
747 struct nfs4_layoutget_res
*lgr
,
750 struct nfs4_filelayout_segment
*fl
;
752 struct nfs4_deviceid id
;
754 dprintk("--> %s\n", __func__
);
755 fl
= kzalloc(sizeof(*fl
), gfp_flags
);
759 rc
= filelayout_decode_layout(layoutid
, fl
, lgr
, &id
, gfp_flags
);
760 if (rc
!= 0 || filelayout_check_layout(layoutid
, fl
, lgr
, &id
, gfp_flags
)) {
761 _filelayout_free_lseg(fl
);
764 return &fl
->generic_hdr
;
768 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
770 * return true : coalesce page
771 * return false : don't coalesce page
774 filelayout_pg_test(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*prev
,
775 struct nfs_page
*req
)
777 u64 p_stripe
, r_stripe
;
780 if (!pnfs_generic_pg_test(pgio
, prev
, req
) ||
781 !nfs_generic_pg_test(pgio
, prev
, req
))
784 p_stripe
= (u64
)req_offset(prev
);
785 r_stripe
= (u64
)req_offset(req
);
786 stripe_unit
= FILELAYOUT_LSEG(pgio
->pg_lseg
)->stripe_unit
;
788 do_div(p_stripe
, stripe_unit
);
789 do_div(r_stripe
, stripe_unit
);
791 return (p_stripe
== r_stripe
);
795 filelayout_pg_init_read(struct nfs_pageio_descriptor
*pgio
,
796 struct nfs_page
*req
)
798 BUG_ON(pgio
->pg_lseg
!= NULL
);
800 if (req
->wb_offset
!= req
->wb_pgbase
) {
802 * Handling unaligned pages is difficult, because have to
803 * somehow split a req in two in certain cases in the
804 * pg.test code. Avoid this by just not using pnfs
807 nfs_pageio_reset_read_mds(pgio
);
810 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
816 /* If no lseg, fall back to read through mds */
817 if (pgio
->pg_lseg
== NULL
)
818 nfs_pageio_reset_read_mds(pgio
);
822 filelayout_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
823 struct nfs_page
*req
)
825 struct nfs_commit_info cinfo
;
828 BUG_ON(pgio
->pg_lseg
!= NULL
);
830 if (req
->wb_offset
!= req
->wb_pgbase
)
832 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
838 /* If no lseg, fall back to write through mds */
839 if (pgio
->pg_lseg
== NULL
)
841 nfs_init_cinfo(&cinfo
, pgio
->pg_inode
, pgio
->pg_dreq
);
842 status
= filelayout_alloc_commit_info(pgio
->pg_lseg
, &cinfo
, GFP_NOFS
);
844 put_lseg(pgio
->pg_lseg
);
845 pgio
->pg_lseg
= NULL
;
850 nfs_pageio_reset_write_mds(pgio
);
853 static const struct nfs_pageio_ops filelayout_pg_read_ops
= {
854 .pg_init
= filelayout_pg_init_read
,
855 .pg_test
= filelayout_pg_test
,
856 .pg_doio
= pnfs_generic_pg_readpages
,
859 static const struct nfs_pageio_ops filelayout_pg_write_ops
= {
860 .pg_init
= filelayout_pg_init_write
,
861 .pg_test
= filelayout_pg_test
,
862 .pg_doio
= pnfs_generic_pg_writepages
,
865 static u32
select_bucket_index(struct nfs4_filelayout_segment
*fl
, u32 j
)
867 if (fl
->stripe_type
== STRIPE_SPARSE
)
868 return nfs4_fl_calc_ds_index(&fl
->generic_hdr
, j
);
873 /* The generic layer is about to remove the req from the commit list.
874 * If this will make the bucket empty, it will need to put the lseg reference.
877 filelayout_clear_request_commit(struct nfs_page
*req
,
878 struct nfs_commit_info
*cinfo
)
880 struct pnfs_layout_segment
*freeme
= NULL
;
882 spin_lock(cinfo
->lock
);
883 if (!test_and_clear_bit(PG_COMMIT_TO_DS
, &req
->wb_flags
))
885 cinfo
->ds
->nwritten
--;
886 if (list_is_singular(&req
->wb_list
)) {
887 struct pnfs_commit_bucket
*bucket
;
889 bucket
= list_first_entry(&req
->wb_list
,
890 struct pnfs_commit_bucket
,
892 freeme
= bucket
->wlseg
;
893 bucket
->wlseg
= NULL
;
896 nfs_request_remove_commit_list(req
, cinfo
);
897 spin_unlock(cinfo
->lock
);
901 static struct list_head
*
902 filelayout_choose_commit_list(struct nfs_page
*req
,
903 struct pnfs_layout_segment
*lseg
,
904 struct nfs_commit_info
*cinfo
)
906 struct nfs4_filelayout_segment
*fl
= FILELAYOUT_LSEG(lseg
);
908 struct list_head
*list
;
909 struct pnfs_commit_bucket
*buckets
;
911 if (fl
->commit_through_mds
)
912 return &cinfo
->mds
->list
;
914 /* Note that we are calling nfs4_fl_calc_j_index on each page
915 * that ends up being committed to a data server. An attractive
916 * alternative is to add a field to nfs_write_data and nfs_page
917 * to store the value calculated in filelayout_write_pagelist
918 * and just use that here.
920 j
= nfs4_fl_calc_j_index(lseg
, req_offset(req
));
921 i
= select_bucket_index(fl
, j
);
922 buckets
= cinfo
->ds
->buckets
;
923 list
= &buckets
[i
].written
;
924 if (list_empty(list
)) {
925 /* Non-empty buckets hold a reference on the lseg. That ref
926 * is normally transferred to the COMMIT call and released
927 * there. It could also be released if the last req is pulled
928 * off due to a rewrite, in which case it will be done in
929 * filelayout_clear_request_commit
931 buckets
[i
].wlseg
= get_lseg(lseg
);
933 set_bit(PG_COMMIT_TO_DS
, &req
->wb_flags
);
934 cinfo
->ds
->nwritten
++;
939 filelayout_mark_request_commit(struct nfs_page
*req
,
940 struct pnfs_layout_segment
*lseg
,
941 struct nfs_commit_info
*cinfo
)
943 struct list_head
*list
;
945 list
= filelayout_choose_commit_list(req
, lseg
, cinfo
);
946 nfs_request_add_commit_list(req
, list
, cinfo
);
949 static u32
calc_ds_index_from_commit(struct pnfs_layout_segment
*lseg
, u32 i
)
951 struct nfs4_filelayout_segment
*flseg
= FILELAYOUT_LSEG(lseg
);
953 if (flseg
->stripe_type
== STRIPE_SPARSE
)
956 return nfs4_fl_calc_ds_index(lseg
, i
);
959 static struct nfs_fh
*
960 select_ds_fh_from_commit(struct pnfs_layout_segment
*lseg
, u32 i
)
962 struct nfs4_filelayout_segment
*flseg
= FILELAYOUT_LSEG(lseg
);
964 if (flseg
->stripe_type
== STRIPE_SPARSE
) {
965 if (flseg
->num_fh
== 1)
967 else if (flseg
->num_fh
== 0)
968 /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
971 return flseg
->fh_array
[i
];
974 static int filelayout_initiate_commit(struct nfs_commit_data
*data
, int how
)
976 struct pnfs_layout_segment
*lseg
= data
->lseg
;
977 struct nfs4_pnfs_ds
*ds
;
981 idx
= calc_ds_index_from_commit(lseg
, data
->ds_commit_index
);
982 ds
= nfs4_fl_prepare_ds(lseg
, idx
);
984 printk(KERN_ERR
"NFS: %s: prepare_ds failed, use MDS\n",
986 set_bit(lo_fail_bit(IOMODE_RW
), &lseg
->pls_layout
->plh_flags
);
987 set_bit(lo_fail_bit(IOMODE_READ
), &lseg
->pls_layout
->plh_flags
);
988 prepare_to_resend_writes(data
);
989 filelayout_commit_release(data
);
992 dprintk("%s ino %lu, how %d\n", __func__
, data
->inode
->i_ino
, how
);
993 data
->commit_done_cb
= filelayout_commit_done_cb
;
994 data
->ds_clp
= ds
->ds_clp
;
995 fh
= select_ds_fh_from_commit(lseg
, data
->ds_commit_index
);
998 return nfs_initiate_commit(ds
->ds_clp
->cl_rpcclient
, data
,
999 &filelayout_commit_call_ops
, how
);
1003 filelayout_scan_ds_commit_list(struct pnfs_commit_bucket
*bucket
,
1004 struct nfs_commit_info
*cinfo
,
1007 struct list_head
*src
= &bucket
->written
;
1008 struct list_head
*dst
= &bucket
->committing
;
1009 struct nfs_page
*req
, *tmp
;
1012 list_for_each_entry_safe(req
, tmp
, src
, wb_list
) {
1013 if (!nfs_lock_request(req
))
1015 if (cond_resched_lock(cinfo
->lock
))
1016 list_safe_reset_next(req
, tmp
, wb_list
);
1017 nfs_request_remove_commit_list(req
, cinfo
);
1018 clear_bit(PG_COMMIT_TO_DS
, &req
->wb_flags
);
1019 nfs_list_add_request(req
, dst
);
1025 cinfo
->ds
->nwritten
-= ret
;
1026 cinfo
->ds
->ncommitting
+= ret
;
1027 bucket
->clseg
= bucket
->wlseg
;
1028 if (list_empty(src
))
1029 bucket
->wlseg
= NULL
;
1031 get_lseg(bucket
->clseg
);
1036 /* Move reqs from written to committing lists, returning count of number moved.
1037 * Note called with cinfo->lock held.
1039 static int filelayout_scan_commit_lists(struct nfs_commit_info
*cinfo
,
1044 for (i
= 0; i
< cinfo
->ds
->nbuckets
&& max
!= 0; i
++) {
1045 cnt
= filelayout_scan_ds_commit_list(&cinfo
->ds
->buckets
[i
],
1054 alloc_ds_commits(struct nfs_commit_info
*cinfo
, struct list_head
*list
)
1056 struct pnfs_ds_commit_info
*fl_cinfo
;
1057 struct pnfs_commit_bucket
*bucket
;
1058 struct nfs_commit_data
*data
;
1060 unsigned int nreq
= 0;
1062 fl_cinfo
= cinfo
->ds
;
1063 bucket
= fl_cinfo
->buckets
;
1064 for (i
= 0; i
< fl_cinfo
->nbuckets
; i
++, bucket
++) {
1065 if (list_empty(&bucket
->committing
))
1067 data
= nfs_commitdata_alloc();
1070 data
->ds_commit_index
= i
;
1071 data
->lseg
= bucket
->clseg
;
1072 bucket
->clseg
= NULL
;
1073 list_add(&data
->pages
, list
);
1077 /* Clean up on error */
1078 for (j
= i
; j
< fl_cinfo
->nbuckets
; j
++, bucket
++) {
1079 if (list_empty(&bucket
->committing
))
1081 nfs_retry_commit(&bucket
->committing
, bucket
->clseg
, cinfo
);
1082 put_lseg(bucket
->clseg
);
1083 bucket
->clseg
= NULL
;
1085 /* Caller will clean up entries put on list */
1089 /* This follows nfs_commit_list pretty closely */
1091 filelayout_commit_pagelist(struct inode
*inode
, struct list_head
*mds_pages
,
1092 int how
, struct nfs_commit_info
*cinfo
)
1094 struct nfs_commit_data
*data
, *tmp
;
1096 unsigned int nreq
= 0;
1098 if (!list_empty(mds_pages
)) {
1099 data
= nfs_commitdata_alloc();
1102 list_add(&data
->pages
, &list
);
1105 nfs_retry_commit(mds_pages
, NULL
, cinfo
);
1108 nreq
+= alloc_ds_commits(cinfo
, &list
);
1111 nfs_commit_clear_lock(NFS_I(inode
));
1115 atomic_add(nreq
, &cinfo
->mds
->rpcs_out
);
1117 list_for_each_entry_safe(data
, tmp
, &list
, pages
) {
1118 list_del_init(&data
->pages
);
1120 nfs_init_commit(data
, mds_pages
, NULL
);
1121 nfs_initiate_commit(NFS_CLIENT(inode
), data
,
1122 data
->mds_ops
, how
);
1124 struct pnfs_commit_bucket
*buckets
;
1126 buckets
= cinfo
->ds
->buckets
;
1127 nfs_init_commit(data
, &buckets
[data
->ds_commit_index
].committing
, data
->lseg
);
1128 filelayout_initiate_commit(data
, how
);
1132 cinfo
->ds
->ncommitting
= 0;
1133 return PNFS_ATTEMPTED
;
1137 filelayout_free_deveiceid_node(struct nfs4_deviceid_node
*d
)
1139 nfs4_fl_free_deviceid(container_of(d
, struct nfs4_file_layout_dsaddr
, id_node
));
1142 static struct pnfs_layout_hdr
*
1143 filelayout_alloc_layout_hdr(struct inode
*inode
, gfp_t gfp_flags
)
1145 struct nfs4_filelayout
*flo
;
1147 flo
= kzalloc(sizeof(*flo
), gfp_flags
);
1148 return &flo
->generic_hdr
;
1152 filelayout_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
1154 kfree(FILELAYOUT_FROM_HDR(lo
));
1157 static struct pnfs_ds_commit_info
*
1158 filelayout_get_ds_info(struct inode
*inode
)
1160 return &FILELAYOUT_FROM_HDR(NFS_I(inode
)->layout
)->commit_info
;
1163 static struct pnfs_layoutdriver_type filelayout_type
= {
1164 .id
= LAYOUT_NFSV4_1_FILES
,
1165 .name
= "LAYOUT_NFSV4_1_FILES",
1166 .owner
= THIS_MODULE
,
1167 .alloc_layout_hdr
= filelayout_alloc_layout_hdr
,
1168 .free_layout_hdr
= filelayout_free_layout_hdr
,
1169 .alloc_lseg
= filelayout_alloc_lseg
,
1170 .free_lseg
= filelayout_free_lseg
,
1171 .pg_read_ops
= &filelayout_pg_read_ops
,
1172 .pg_write_ops
= &filelayout_pg_write_ops
,
1173 .get_ds_info
= &filelayout_get_ds_info
,
1174 .mark_request_commit
= filelayout_mark_request_commit
,
1175 .clear_request_commit
= filelayout_clear_request_commit
,
1176 .scan_commit_lists
= filelayout_scan_commit_lists
,
1177 .commit_pagelist
= filelayout_commit_pagelist
,
1178 .read_pagelist
= filelayout_read_pagelist
,
1179 .write_pagelist
= filelayout_write_pagelist
,
1180 .free_deviceid_node
= filelayout_free_deveiceid_node
,
1183 static int __init
nfs4filelayout_init(void)
1185 printk(KERN_INFO
"%s: NFSv4 File Layout Driver Registering...\n",
1187 return pnfs_register_layoutdriver(&filelayout_type
);
1190 static void __exit
nfs4filelayout_exit(void)
1192 printk(KERN_INFO
"%s: NFSv4 File Layout Driver Unregistering...\n",
1194 pnfs_unregister_layoutdriver(&filelayout_type
);
1197 MODULE_ALIAS("nfs-layouttype4-1");
1199 module_init(nfs4filelayout_init
);
1200 module_exit(nfs4filelayout_exit
);