summaryrefslogtreecommitdiff
path: root/fs/nfs/flexfilelayout/flexfilelayoutdev.c
blob: e2c01f204a956b584725d1d187d1ea1fc22d6ab0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
/*
 * Device operations for the pnfs nfs4 file layout driver.
 *
 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
 *
 * Tao Peng <bergwolf@primarydata.com>
 */

#include <linux/nfs_fs.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/sunrpc/addr.h>

#include "../internal.h"
#include "../nfs4session.h"
#include "flexfilelayout.h"

#define NFSDBG_FACILITY		NFSDBG_PNFS_LD

static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO;
static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS;

void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
{
	if (mirror_ds)
		nfs4_put_deviceid_node(&mirror_ds->id_node);
}

void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
{
	nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
	nfs4_pnfs_ds_put(mirror_ds->ds);
	kfree(mirror_ds);
}

/* Decode opaque device data and construct new_ds using it */
struct nfs4_ff_layout_ds *
nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
			    gfp_t gfp_flags)
{
	struct xdr_stream stream;
	struct xdr_buf buf;
	struct page *scratch;
	struct list_head dsaddrs;
	struct nfs4_pnfs_ds_addr *da;
	struct nfs4_ff_layout_ds *new_ds = NULL;
	struct nfs4_ff_ds_version *ds_versions = NULL;
	u32 mp_count;
	u32 version_count;
	__be32 *p;
	int i, ret = -ENOMEM;

	/* set up xdr stream */
	scratch = alloc_page(gfp_flags);
	if (!scratch)
		goto out_err;

	new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
	if (!new_ds)
		goto out_scratch;

	nfs4_init_deviceid_node(&new_ds->id_node,
				server,
				&pdev->dev_id);
	INIT_LIST_HEAD(&dsaddrs);

	xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
	xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);

	/* multipath count */
	p = xdr_inline_decode(&stream, 4);
	if (unlikely(!p))
		goto out_err_drain_dsaddrs;
	mp_count = be32_to_cpup(p);
	dprintk("%s: multipath ds count %d\n", __func__, mp_count);

	for (i = 0; i < mp_count; i++) {
		/* multipath ds */
		da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
					    &stream, gfp_flags);
		if (da)
			list_add_tail(&da->da_node, &dsaddrs);
	}
	if (list_empty(&dsaddrs)) {
		dprintk("%s: no suitable DS addresses found\n",
			__func__);
		ret = -ENOMEDIUM;
		goto out_err_drain_dsaddrs;
	}

	/* version count */
	p = xdr_inline_decode(&stream, 4);
	if (unlikely(!p))
		goto out_err_drain_dsaddrs;
	version_count = be32_to_cpup(p);
	dprintk("%s: version count %d\n", __func__, version_count);

	ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version),
			      gfp_flags);
	if (!ds_versions)
		goto out_scratch;

	for (i = 0; i < version_count; i++) {
		/* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
		 * tightly_coupled(4) */
		p = xdr_inline_decode(&stream, 20);
		if (unlikely(!p))
			goto out_err_drain_dsaddrs;
		ds_versions[i].version = be32_to_cpup(p++);
		ds_versions[i].minor_version = be32_to_cpup(p++);
		ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
		ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
		ds_versions[i].tightly_coupled = be32_to_cpup(p);

		if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
			ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
		if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
			ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;

		if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) {
			dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
				i, ds_versions[i].version,
				ds_versions[i].minor_version);
			ret = -EPROTONOSUPPORT;
			goto out_err_drain_dsaddrs;
		}

		dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
			__func__, i, ds_versions[i].version,
			ds_versions[i].minor_version,
			ds_versions[i].rsize,
			ds_versions[i].wsize,
			ds_versions[i].tightly_coupled);
	}

	new_ds->ds_versions = ds_versions;
	new_ds->ds_versions_cnt = version_count;

	new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
	if (!new_ds->ds)
		goto out_err_drain_dsaddrs;

	/* If DS was already in cache, free ds addrs */
	while (!list_empty(&dsaddrs)) {
		da = list_first_entry(&dsaddrs,
				      struct nfs4_pnfs_ds_addr,
				      da_node);
		list_del_init(&da->da_node);
		kfree(da->da_remotestr);
		kfree(da);
	}

	__free_page(scratch);
	return new_ds;

out_err_drain_dsaddrs:
	while (!list_empty(&dsaddrs)) {
		da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
				      da_node);
		list_del_init(&da->da_node);
		kfree(da->da_remotestr);
		kfree(da);
	}

	kfree(ds_versions);
out_scratch:
	__free_page(scratch);
out_err:
	kfree(new_ds);

	dprintk("%s ERROR: returning %d\n", __func__, ret);
	return NULL;
}

static u64
end_offset(u64 start, u64 len)
{
	u64 end;

	end = start + len;
	return end >= start ? end : NFS4_MAX_UINT64;
}

static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
			    u64 offset, u64 length)
{
	u64 end;

	end = max_t(u64, end_offset(err->offset, err->length),
		    end_offset(offset, length));
	err->offset = min_t(u64, err->offset, offset);
	err->length = end - err->offset;
}

static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err,  u64 offset,
			       u64 length, int status, enum nfs_opnum4 opnum,
			       nfs4_stateid *stateid,
			       struct nfs4_deviceid *deviceid)
{
	return err->status == status && err->opnum == opnum &&
	       nfs4_stateid_match(&err->stateid, stateid) &&
	       !memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) &&
	       end_offset(err->offset, err->length) >= offset &&
	       err->offset <= end_offset(offset, length);
}

static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old,
			   struct nfs4_ff_layout_ds_err *new)
{
	if (!ds_error_can_merge(old, new->offset, new->length, new->status,
				new->opnum, &new->stateid, &new->deviceid))
		return false;

	extend_ds_error(old, new->offset, new->length);
	return true;
}

static bool
ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
			      struct nfs4_ff_layout_ds_err *dserr)
{
	struct nfs4_ff_layout_ds_err *err;

	list_for_each_entry(err, &flo->error_list, list) {
		if (merge_ds_error(err, dserr)) {
			return true;
		}
	}

	list_add(&dserr->list, &flo->error_list);
	return false;
}

static bool
ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset,
			  u64 length, int status, enum nfs_opnum4 opnum,
			  nfs4_stateid *stateid, struct nfs4_deviceid *deviceid)
{
	bool found = false;
	struct nfs4_ff_layout_ds_err *err;

	list_for_each_entry(err, &flo->error_list, list) {
		if (ds_error_can_merge(err, offset, length, status, opnum,
				       stateid, deviceid)) {
			found = true;
			extend_ds_error(err, offset, length);
			break;
		}
	}

	return found;
}

int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
			     struct nfs4_ff_layout_mirror *mirror, u64 offset,
			     u64 length, int status, enum nfs_opnum4 opnum,
			     gfp_t gfp_flags)
{
	struct nfs4_ff_layout_ds_err *dserr;
	bool needfree;

	if (status == 0)
		return 0;

	if (mirror->mirror_ds == NULL)
		return -EINVAL;

	spin_lock(&flo->generic_hdr.plh_inode->i_lock);
	if (ff_layout_update_ds_error(flo, offset, length, status, opnum,
				      &mirror->stateid,
				      &mirror->mirror_ds->id_node.deviceid)) {
		spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
		return 0;
	}
	spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
	dserr = kmalloc(sizeof(*dserr), gfp_flags);
	if (!dserr)
		return -ENOMEM;

	INIT_LIST_HEAD(&dserr->list);
	dserr->offset = offset;
	dserr->length = length;
	dserr->status = status;
	dserr->opnum = opnum;
	nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
	memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
	       NFS4_DEVICEID4_SIZE);

	spin_lock(&flo->generic_hdr.plh_inode->i_lock);
	needfree = ff_layout_add_ds_error_locked(flo, dserr);
	spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
	if (needfree)
		kfree(dserr);

	return 0;
}

/* currently we only support AUTH_NONE and AUTH_SYS */
static rpc_authflavor_t
nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror)
{
	if (mirror->uid == (u32)-1)
		return RPC_AUTH_NULL;
	return RPC_AUTH_UNIX;
}

/* fetch cred for NFSv3 DS */
static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror,
				      struct nfs4_pnfs_ds *ds)
{
	if (ds->ds_clp && !mirror->cred &&
	    mirror->mirror_ds->ds_versions[0].version == 3) {
		struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth;
		struct rpc_cred *cred;
		struct auth_cred acred = {
			.uid = make_kuid(&init_user_ns, mirror->uid),
			.gid = make_kgid(&init_user_ns, mirror->gid),
		};

		/* AUTH_NULL ignores acred */
		cred = auth->au_ops->lookup_cred(auth, &acred, 0);
		if (IS_ERR(cred)) {
			dprintk("%s: lookup_cred failed with %ld\n",
				__func__, PTR_ERR(cred));
			return PTR_ERR(cred);
		} else {
			mirror->cred = cred;
		}
	}
	return 0;
}

struct nfs_fh *
nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
{
	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
	struct nfs_fh *fh = NULL;
	struct nfs4_deviceid_node *devid;

	if (mirror == NULL || mirror->mirror_ds == NULL ||
	    mirror->mirror_ds->ds == NULL) {
		printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n",
			__func__, mirror_idx);
		if (mirror && mirror->mirror_ds) {
			devid = &mirror->mirror_ds->id_node;
			pnfs_generic_mark_devid_invalid(devid);
		}
		goto out;
	}

	/* FIXME: For now assume there is only 1 version available for the DS */
	fh = &mirror->fh_versions[0];
out:
	return fh;
}

/* Upon return, either ds is connected, or ds is NULL */
struct nfs4_pnfs_ds *
nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
			  bool fail_return)
{
	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
	struct nfs4_pnfs_ds *ds = NULL;
	struct nfs4_deviceid_node *devid;
	struct inode *ino = lseg->pls_layout->plh_inode;
	struct nfs_server *s = NFS_SERVER(ino);
	unsigned int max_payload;
	rpc_authflavor_t flavor;

	if (mirror == NULL || mirror->mirror_ds == NULL ||
	    mirror->mirror_ds->ds == NULL) {
		printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
			__func__, ds_idx);
		if (mirror && mirror->mirror_ds) {
			devid = &mirror->mirror_ds->id_node;
			pnfs_generic_mark_devid_invalid(devid);
		}
		goto out;
	}

	devid = &mirror->mirror_ds->id_node;
	if (ff_layout_test_devid_unavailable(devid))
		goto out;

	ds = mirror->mirror_ds->ds;
	/* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
	smp_rmb();
	if (ds->ds_clp)
		goto out;

	flavor = nfs4_ff_layout_choose_authflavor(mirror);

	/* FIXME: For now we assume the server sent only one version of NFS
	 * to use for the DS.
	 */
	nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo,
			     dataserver_retrans,
			     mirror->mirror_ds->ds_versions[0].version,
			     mirror->mirror_ds->ds_versions[0].minor_version,
			     flavor);

	/* connect success, check rsize/wsize limit */
	if (ds->ds_clp) {
		max_payload =
			nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
				       NULL);
		if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
			mirror->mirror_ds->ds_versions[0].rsize = max_payload;
		if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
			mirror->mirror_ds->ds_versions[0].wsize = max_payload;
	} else {
		ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
					 mirror, lseg->pls_range.offset,
					 lseg->pls_range.length, NFS4ERR_NXIO,
					 OP_ILLEGAL, GFP_NOIO);
		if (fail_return) {
			pnfs_error_mark_layout_for_return(ino, lseg);
			if (ff_layout_has_available_ds(lseg))
				pnfs_set_retry_layoutget(lseg->pls_layout);
			else
				pnfs_clear_retry_layoutget(lseg->pls_layout);

		} else {
			if (ff_layout_has_available_ds(lseg))
				set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
					&lseg->pls_layout->plh_flags);
			else {
				pnfs_error_mark_layout_for_return(ino, lseg);
				pnfs_clear_retry_layoutget(lseg->pls_layout);
			}
		}
	}

	if (ff_layout_update_mirror_cred(mirror, ds))
		ds = NULL;
out:
	return ds;
}

struct rpc_cred *
ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx,
		      struct rpc_cred *mdscred)
{
	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
	struct rpc_cred *cred = ERR_PTR(-EINVAL);

	if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true))
		goto out;

	if (mirror && mirror->cred)
		cred = mirror->cred;
	else
		cred = mdscred;
out:
	return cred;
}

/**
* Find or create a DS rpc client with th MDS server rpc client auth flavor
* in the nfs_client cl_ds_clients list.
*/
struct rpc_clnt *
nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx,
				 struct nfs_client *ds_clp, struct inode *inode)
{
	struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);

	switch (mirror->mirror_ds->ds_versions[0].version) {
	case 3:
		/* For NFSv3 DS, flavor is set when creating DS connections */
		return ds_clp->cl_rpcclient;
	case 4:
		return nfs4_find_or_create_ds_client(ds_clp, inode);
	default:
		BUG();
	}
}

static bool is_range_intersecting(u64 offset1, u64 length1,
				  u64 offset2, u64 length2)
{
	u64 end1 = end_offset(offset1, length1);
	u64 end2 = end_offset(offset2, length2);

	return (end1 == NFS4_MAX_UINT64 || end1 > offset2) &&
	       (end2 == NFS4_MAX_UINT64 || end2 > offset1);
}

/* called with inode i_lock held */
int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
			      struct xdr_stream *xdr, int *count,
			      const struct pnfs_layout_range *range)
{
	struct nfs4_ff_layout_ds_err *err, *n;
	__be32 *p;

	list_for_each_entry_safe(err, n, &flo->error_list, list) {
		if (!is_range_intersecting(err->offset, err->length,
					   range->offset, range->length))
			continue;
		/* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
		 * + deviceid(NFS4_DEVICEID4_SIZE) + status(4) + opnum(4)
		 */
		p = xdr_reserve_space(xdr,
				24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
		if (unlikely(!p))
			return -ENOBUFS;
		p = xdr_encode_hyper(p, err->offset);
		p = xdr_encode_hyper(p, err->length);
		p = xdr_encode_opaque_fixed(p, &err->stateid,
					    NFS4_STATEID_SIZE);
		p = xdr_encode_opaque_fixed(p, &err->deviceid,
					    NFS4_DEVICEID4_SIZE);
		*p++ = cpu_to_be32(err->status);
		*p++ = cpu_to_be32(err->opnum);
		*count += 1;
		list_del(&err->list);
		dprintk("%s: offset %llu length %llu status %d op %d count %d\n",
			__func__, err->offset, err->length, err->status,
			err->opnum, *count);
		kfree(err);
	}

	return 0;
}

bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
{
	struct nfs4_ff_layout_mirror *mirror;
	struct nfs4_deviceid_node *devid;
	int idx;

	for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
		mirror = FF_LAYOUT_COMP(lseg, idx);
		if (mirror && mirror->mirror_ds) {
			devid = &mirror->mirror_ds->id_node;
			if (!ff_layout_test_devid_unavailable(devid))
				return true;
		}
	}

	return false;
}

module_param(dataserver_retrans, uint, 0644);
MODULE_PARM_DESC(dataserver_retrans, "The  number of times the NFSv4.1 client "
			"retries a request before it attempts further "
			" recovery  action.");
module_param(dataserver_timeo, uint, 0644);
MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
			"NFSv4.1  client  waits for a response from a "
			" data server before it retries an NFS request.");