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Linux 4.6-rc6
[cris-mirror.git] / fs / nfsd / blocklayout.c
blobe55b5242614da7a9d209db34e8c0f6519cf69446
1 /*
2 * Copyright (c) 2014-2016 Christoph Hellwig.
3 */
4 #include <linux/exportfs.h>
5 #include <linux/genhd.h>
6 #include <linux/slab.h>
7 #include <linux/pr.h>
8
9 #include <linux/nfsd/debug.h>
10 #include <scsi/scsi_proto.h>
11 #include <scsi/scsi_common.h>
12
13 #include "blocklayoutxdr.h"
14 #include "pnfs.h"
15
16 #define NFSDDBG_FACILITY NFSDDBG_PNFS
17
18
19 static __be32
20 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
21 struct nfsd4_layoutget *args)
22 {
23 struct nfsd4_layout_seg *seg = &args->lg_seg;
24 struct super_block *sb = inode->i_sb;
25 u32 block_size = (1 << inode->i_blkbits);
26 struct pnfs_block_extent *bex;
27 struct iomap iomap;
28 u32 device_generation = 0;
29 int error;
30
31 if (seg->offset & (block_size - 1)) {
32 dprintk("pnfsd: I/O misaligned\n");
33 goto out_layoutunavailable;
34 }
35
36 /*
37 * Some clients barf on non-zero block numbers for NONE or INVALID
38 * layouts, so make sure to zero the whole structure.
39 */
40 error = -ENOMEM;
41 bex = kzalloc(sizeof(*bex), GFP_KERNEL);
42 if (!bex)
43 goto out_error;
44 args->lg_content = bex;
45
46 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
47 &iomap, seg->iomode != IOMODE_READ,
48 &device_generation);
49 if (error) {
50 if (error == -ENXIO)
51 goto out_layoutunavailable;
52 goto out_error;
53 }
54
55 if (iomap.length < args->lg_minlength) {
56 dprintk("pnfsd: extent smaller than minlength\n");
57 goto out_layoutunavailable;
58 }
59
60 switch (iomap.type) {
61 case IOMAP_MAPPED:
62 if (seg->iomode == IOMODE_READ)
63 bex->es = PNFS_BLOCK_READ_DATA;
64 else
65 bex->es = PNFS_BLOCK_READWRITE_DATA;
66 bex->soff = (iomap.blkno << 9);
67 break;
68 case IOMAP_UNWRITTEN:
69 if (seg->iomode & IOMODE_RW) {
70 /*
71 * Crack monkey special case from section 2.3.1.
72 */
73 if (args->lg_minlength == 0) {
74 dprintk("pnfsd: no soup for you!\n");
75 goto out_layoutunavailable;
76 }
77
78 bex->es = PNFS_BLOCK_INVALID_DATA;
79 bex->soff = (iomap.blkno << 9);
80 break;
81 }
82 /*FALLTHRU*/
83 case IOMAP_HOLE:
84 if (seg->iomode == IOMODE_READ) {
85 bex->es = PNFS_BLOCK_NONE_DATA;
86 break;
87 }
88 /*FALLTHRU*/
89 case IOMAP_DELALLOC:
90 default:
91 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
92 goto out_layoutunavailable;
93 }
94
95 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
96 if (error)
97 goto out_error;
98 bex->foff = iomap.offset;
99 bex->len = iomap.length;
100
101 seg->offset = iomap.offset;
102 seg->length = iomap.length;
103
104 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
105 return 0;
106
107 out_error:
108 seg->length = 0;
109 return nfserrno(error);
110 out_layoutunavailable:
111 seg->length = 0;
112 return nfserr_layoutunavailable;
113 }
114
115 static __be32
116 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
117 struct iomap *iomaps, int nr_iomaps)
118 {
119 loff_t new_size = lcp->lc_last_wr + 1;
120 struct iattr iattr = { .ia_valid = 0 };
121 int error;
122
123 if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
124 timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
125 lcp->lc_mtime = current_fs_time(inode->i_sb);
126 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
127 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
128
129 if (new_size > i_size_read(inode)) {
130 iattr.ia_valid |= ATTR_SIZE;
131 iattr.ia_size = new_size;
132 }
133
134 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
135 nr_iomaps, &iattr);
136 kfree(iomaps);
137 return nfserrno(error);
138 }
139
140 #ifdef CONFIG_NFSD_BLOCKLAYOUT
141 static int
142 nfsd4_block_get_device_info_simple(struct super_block *sb,
143 struct nfsd4_getdeviceinfo *gdp)
144 {
145 struct pnfs_block_deviceaddr *dev;
146 struct pnfs_block_volume *b;
147
148 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
149 sizeof(struct pnfs_block_volume), GFP_KERNEL);
150 if (!dev)
151 return -ENOMEM;
152 gdp->gd_device = dev;
153
154 dev->nr_volumes = 1;
155 b = &dev->volumes[0];
156
157 b->type = PNFS_BLOCK_VOLUME_SIMPLE;
158 b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
159 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
160 &b->simple.offset);
161 }
162
163 static __be32
164 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
165 struct nfs4_client *clp,
166 struct nfsd4_getdeviceinfo *gdp)
167 {
168 if (sb->s_bdev != sb->s_bdev->bd_contains)
169 return nfserr_inval;
170 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
171 }
172
173 static __be32
174 nfsd4_block_proc_layoutcommit(struct inode *inode,
175 struct nfsd4_layoutcommit *lcp)
176 {
177 struct iomap *iomaps;
178 int nr_iomaps;
179
180 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
181 lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
182 if (nr_iomaps < 0)
183 return nfserrno(nr_iomaps);
184
185 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
186 }
187
188 const struct nfsd4_layout_ops bl_layout_ops = {
189 /*
190 * Pretend that we send notification to the client. This is a blatant
191 * lie to force recent Linux clients to cache our device IDs.
192 * We rarely ever change the device ID, so the harm of leaking deviceids
193 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
194 * in this regard, but I filed errata 4119 for this a while ago, and
195 * hopefully the Linux client will eventually start caching deviceids
196 * without this again.
197 */
198 .notify_types =
199 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
200 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo,
201 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
202 .proc_layoutget = nfsd4_block_proc_layoutget,
203 .encode_layoutget = nfsd4_block_encode_layoutget,
204 .proc_layoutcommit = nfsd4_block_proc_layoutcommit,
205 };
206 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
207
208 #ifdef CONFIG_NFSD_SCSILAYOUT
209 static int nfsd4_scsi_identify_device(struct block_device *bdev,
210 struct pnfs_block_volume *b)
211 {
212 struct request_queue *q = bdev->bd_disk->queue;
213 struct request *rq;
214 size_t bufflen = 252, len, id_len;
215 u8 *buf, *d, type, assoc;
216 int error;
217
218 buf = kzalloc(bufflen, GFP_KERNEL);
219 if (!buf)
220 return -ENOMEM;
221
222 rq = blk_get_request(q, READ, GFP_KERNEL);
223 if (IS_ERR(rq)) {
224 error = -ENOMEM;
225 goto out_free_buf;
226 }
227 blk_rq_set_block_pc(rq);
228
229 error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL);
230 if (error)
231 goto out_put_request;
232
233 rq->cmd[0] = INQUIRY;
234 rq->cmd[1] = 1;
235 rq->cmd[2] = 0x83;
236 rq->cmd[3] = bufflen >> 8;
237 rq->cmd[4] = bufflen & 0xff;
238 rq->cmd_len = COMMAND_SIZE(INQUIRY);
239
240 error = blk_execute_rq(rq->q, NULL, rq, 1);
241 if (error) {
242 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n",
243 rq->errors);
244 goto out_put_request;
245 }
246
247 len = (buf[2] << 8) + buf[3] + 4;
248 if (len > bufflen) {
249 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n",
250 len);
251 goto out_put_request;
252 }
253
254 d = buf + 4;
255 for (d = buf + 4; d < buf + len; d += id_len + 4) {
256 id_len = d[3];
257 type = d[1] & 0xf;
258 assoc = (d[1] >> 4) & 0x3;
259
260 /*
261 * We only care about a EUI-64 and NAA designator types
262 * with LU association.
263 */
264 if (assoc != 0x00)
265 continue;
266 if (type != 0x02 && type != 0x03)
267 continue;
268 if (id_len != 8 && id_len != 12 && id_len != 16)
269 continue;
270
271 b->scsi.code_set = PS_CODE_SET_BINARY;
272 b->scsi.designator_type = type == 0x02 ?
273 PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA;
274 b->scsi.designator_len = id_len;
275 memcpy(b->scsi.designator, d + 4, id_len);
276
277 /*
278 * If we found a 8 or 12 byte descriptor continue on to
279 * see if a 16 byte one is available. If we find a
280 * 16 byte descriptor we're done.
281 */
282 if (id_len == 16)
283 break;
284 }
285
286 out_put_request:
287 blk_put_request(rq);
288 out_free_buf:
289 kfree(buf);
290 return error;
291 }
292
293 #define NFSD_MDS_PR_KEY 0x0100000000000000
294
295 /*
296 * We use the client ID as a unique key for the reservations.
297 * This allows us to easily fence a client when recalls fail.
298 */
299 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
300 {
301 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
302 }
303
304 static int
305 nfsd4_block_get_device_info_scsi(struct super_block *sb,
306 struct nfs4_client *clp,
307 struct nfsd4_getdeviceinfo *gdp)
308 {
309 struct pnfs_block_deviceaddr *dev;
310 struct pnfs_block_volume *b;
311 const struct pr_ops *ops;
312 int error;
313
314 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
315 sizeof(struct pnfs_block_volume), GFP_KERNEL);
316 if (!dev)
317 return -ENOMEM;
318 gdp->gd_device = dev;
319
320 dev->nr_volumes = 1;
321 b = &dev->volumes[0];
322
323 b->type = PNFS_BLOCK_VOLUME_SCSI;
324 b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
325
326 error = nfsd4_scsi_identify_device(sb->s_bdev, b);
327 if (error)
328 return error;
329
330 ops = sb->s_bdev->bd_disk->fops->pr_ops;
331 if (!ops) {
332 pr_err("pNFS: device %s does not support PRs.\n",
333 sb->s_id);
334 return -EINVAL;
335 }
336
337 error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
338 if (error) {
339 pr_err("pNFS: failed to register key for device %s.\n",
340 sb->s_id);
341 return -EINVAL;
342 }
343
344 error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
345 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
346 if (error) {
347 pr_err("pNFS: failed to reserve device %s.\n",
348 sb->s_id);
349 return -EINVAL;
350 }
351
352 return 0;
353 }
354
355 static __be32
356 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
357 struct nfs4_client *clp,
358 struct nfsd4_getdeviceinfo *gdp)
359 {
360 if (sb->s_bdev != sb->s_bdev->bd_contains)
361 return nfserr_inval;
362 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
363 }
364 static __be32
365 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
366 struct nfsd4_layoutcommit *lcp)
367 {
368 struct iomap *iomaps;
369 int nr_iomaps;
370
371 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
372 lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
373 if (nr_iomaps < 0)
374 return nfserrno(nr_iomaps);
375
376 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
377 }
378
379 static void
380 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
381 {
382 struct nfs4_client *clp = ls->ls_stid.sc_client;
383 struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
384
385 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
386 nfsd4_scsi_pr_key(clp), 0, true);
387 }
388
389 const struct nfsd4_layout_ops scsi_layout_ops = {
390 /*
391 * Pretend that we send notification to the client. This is a blatant
392 * lie to force recent Linux clients to cache our device IDs.
393 * We rarely ever change the device ID, so the harm of leaking deviceids
394 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
395 * in this regard, but I filed errata 4119 for this a while ago, and
396 * hopefully the Linux client will eventually start caching deviceids
397 * without this again.
398 */
399 .notify_types =
400 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
401 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo,
402 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
403 .proc_layoutget = nfsd4_block_proc_layoutget,
404 .encode_layoutget = nfsd4_block_encode_layoutget,
405 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit,
406 .fence_client = nfsd4_scsi_fence_client,
407 };
408 #endif /* CONFIG_NFSD_SCSILAYOUT */
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