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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8650b8a0 | 2 | /* |
f99d4fbd | 3 | * Copyright (c) 2014-2016 Christoph Hellwig. |
8650b8a0 CH |
4 | */ |
5 | #include <linux/exportfs.h> | |
199a31c6 | 6 | #include <linux/iomap.h> |
8650b8a0 CH |
7 | #include <linux/genhd.h> |
8 | #include <linux/slab.h> | |
f99d4fbd | 9 | #include <linux/pr.h> |
8650b8a0 CH |
10 | |
11 | #include <linux/nfsd/debug.h> | |
f99d4fbd CH |
12 | #include <scsi/scsi_proto.h> |
13 | #include <scsi/scsi_common.h> | |
82ed4db4 | 14 | #include <scsi/scsi_request.h> |
8650b8a0 CH |
15 | |
16 | #include "blocklayoutxdr.h" | |
17 | #include "pnfs.h" | |
18 | ||
19 | #define NFSDDBG_FACILITY NFSDDBG_PNFS | |
20 | ||
21 | ||
8650b8a0 CH |
22 | static __be32 |
23 | nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, | |
24 | struct nfsd4_layoutget *args) | |
25 | { | |
26 | struct nfsd4_layout_seg *seg = &args->lg_seg; | |
27 | struct super_block *sb = inode->i_sb; | |
93407472 | 28 | u32 block_size = i_blocksize(inode); |
8650b8a0 CH |
29 | struct pnfs_block_extent *bex; |
30 | struct iomap iomap; | |
31 | u32 device_generation = 0; | |
32 | int error; | |
33 | ||
8650b8a0 CH |
34 | if (seg->offset & (block_size - 1)) { |
35 | dprintk("pnfsd: I/O misaligned\n"); | |
36 | goto out_layoutunavailable; | |
37 | } | |
38 | ||
39 | /* | |
40 | * Some clients barf on non-zero block numbers for NONE or INVALID | |
41 | * layouts, so make sure to zero the whole structure. | |
42 | */ | |
43 | error = -ENOMEM; | |
44 | bex = kzalloc(sizeof(*bex), GFP_KERNEL); | |
45 | if (!bex) | |
46 | goto out_error; | |
47 | args->lg_content = bex; | |
48 | ||
49 | error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, | |
50 | &iomap, seg->iomode != IOMODE_READ, | |
51 | &device_generation); | |
52 | if (error) { | |
53 | if (error == -ENXIO) | |
54 | goto out_layoutunavailable; | |
55 | goto out_error; | |
56 | } | |
57 | ||
58 | if (iomap.length < args->lg_minlength) { | |
59 | dprintk("pnfsd: extent smaller than minlength\n"); | |
60 | goto out_layoutunavailable; | |
61 | } | |
62 | ||
63 | switch (iomap.type) { | |
64 | case IOMAP_MAPPED: | |
65 | if (seg->iomode == IOMODE_READ) | |
66 | bex->es = PNFS_BLOCK_READ_DATA; | |
67 | else | |
68 | bex->es = PNFS_BLOCK_READWRITE_DATA; | |
19fe5f64 | 69 | bex->soff = iomap.addr; |
8650b8a0 CH |
70 | break; |
71 | case IOMAP_UNWRITTEN: | |
72 | if (seg->iomode & IOMODE_RW) { | |
73 | /* | |
74 | * Crack monkey special case from section 2.3.1. | |
75 | */ | |
76 | if (args->lg_minlength == 0) { | |
77 | dprintk("pnfsd: no soup for you!\n"); | |
78 | goto out_layoutunavailable; | |
79 | } | |
80 | ||
81 | bex->es = PNFS_BLOCK_INVALID_DATA; | |
19fe5f64 | 82 | bex->soff = iomap.addr; |
8650b8a0 CH |
83 | break; |
84 | } | |
85 | /*FALLTHRU*/ | |
86 | case IOMAP_HOLE: | |
87 | if (seg->iomode == IOMODE_READ) { | |
88 | bex->es = PNFS_BLOCK_NONE_DATA; | |
89 | break; | |
90 | } | |
91 | /*FALLTHRU*/ | |
92 | case IOMAP_DELALLOC: | |
93 | default: | |
94 | WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); | |
95 | goto out_layoutunavailable; | |
96 | } | |
97 | ||
98 | error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); | |
99 | if (error) | |
100 | goto out_error; | |
101 | bex->foff = iomap.offset; | |
102 | bex->len = iomap.length; | |
103 | ||
104 | seg->offset = iomap.offset; | |
105 | seg->length = iomap.length; | |
106 | ||
85369523 | 107 | dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); |
8650b8a0 CH |
108 | return 0; |
109 | ||
110 | out_error: | |
111 | seg->length = 0; | |
112 | return nfserrno(error); | |
113 | out_layoutunavailable: | |
114 | seg->length = 0; | |
115 | return nfserr_layoutunavailable; | |
116 | } | |
117 | ||
118 | static __be32 | |
368248ee CH |
119 | nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, |
120 | struct iomap *iomaps, int nr_iomaps) | |
8650b8a0 CH |
121 | { |
122 | loff_t new_size = lcp->lc_last_wr + 1; | |
123 | struct iattr iattr = { .ia_valid = 0 }; | |
8650b8a0 CH |
124 | int error; |
125 | ||
8650b8a0 CH |
126 | if (lcp->lc_mtime.tv_nsec == UTIME_NOW || |
127 | timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) | |
c2050a45 | 128 | lcp->lc_mtime = current_time(inode); |
8650b8a0 CH |
129 | iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; |
130 | iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; | |
131 | ||
132 | if (new_size > i_size_read(inode)) { | |
133 | iattr.ia_valid |= ATTR_SIZE; | |
134 | iattr.ia_size = new_size; | |
135 | } | |
136 | ||
137 | error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, | |
138 | nr_iomaps, &iattr); | |
139 | kfree(iomaps); | |
140 | return nfserrno(error); | |
141 | } | |
142 | ||
368248ee CH |
143 | #ifdef CONFIG_NFSD_BLOCKLAYOUT |
144 | static int | |
145 | nfsd4_block_get_device_info_simple(struct super_block *sb, | |
146 | struct nfsd4_getdeviceinfo *gdp) | |
147 | { | |
148 | struct pnfs_block_deviceaddr *dev; | |
149 | struct pnfs_block_volume *b; | |
150 | ||
151 | dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + | |
152 | sizeof(struct pnfs_block_volume), GFP_KERNEL); | |
153 | if (!dev) | |
154 | return -ENOMEM; | |
155 | gdp->gd_device = dev; | |
156 | ||
157 | dev->nr_volumes = 1; | |
158 | b = &dev->volumes[0]; | |
159 | ||
160 | b->type = PNFS_BLOCK_VOLUME_SIMPLE; | |
161 | b->simple.sig_len = PNFS_BLOCK_UUID_LEN; | |
162 | return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, | |
163 | &b->simple.offset); | |
164 | } | |
165 | ||
166 | static __be32 | |
167 | nfsd4_block_proc_getdeviceinfo(struct super_block *sb, | |
d7c920d1 | 168 | struct svc_rqst *rqstp, |
f99d4fbd | 169 | struct nfs4_client *clp, |
368248ee CH |
170 | struct nfsd4_getdeviceinfo *gdp) |
171 | { | |
172 | if (sb->s_bdev != sb->s_bdev->bd_contains) | |
173 | return nfserr_inval; | |
174 | return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); | |
175 | } | |
176 | ||
177 | static __be32 | |
178 | nfsd4_block_proc_layoutcommit(struct inode *inode, | |
179 | struct nfsd4_layoutcommit *lcp) | |
180 | { | |
181 | struct iomap *iomaps; | |
182 | int nr_iomaps; | |
183 | ||
184 | nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, | |
93407472 | 185 | lcp->lc_up_len, &iomaps, i_blocksize(inode)); |
368248ee CH |
186 | if (nr_iomaps < 0) |
187 | return nfserrno(nr_iomaps); | |
188 | ||
189 | return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); | |
190 | } | |
191 | ||
8650b8a0 | 192 | const struct nfsd4_layout_ops bl_layout_ops = { |
40cdc7a5 CH |
193 | /* |
194 | * Pretend that we send notification to the client. This is a blatant | |
195 | * lie to force recent Linux clients to cache our device IDs. | |
196 | * We rarely ever change the device ID, so the harm of leaking deviceids | |
197 | * for a while isn't too bad. Unfortunately RFC5661 is a complete mess | |
198 | * in this regard, but I filed errata 4119 for this a while ago, and | |
199 | * hopefully the Linux client will eventually start caching deviceids | |
200 | * without this again. | |
201 | */ | |
202 | .notify_types = | |
203 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, | |
8650b8a0 CH |
204 | .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, |
205 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
206 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
207 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
208 | .proc_layoutcommit = nfsd4_block_proc_layoutcommit, | |
209 | }; | |
368248ee | 210 | #endif /* CONFIG_NFSD_BLOCKLAYOUT */ |
f99d4fbd CH |
211 | |
212 | #ifdef CONFIG_NFSD_SCSILAYOUT | |
213 | static int nfsd4_scsi_identify_device(struct block_device *bdev, | |
214 | struct pnfs_block_volume *b) | |
215 | { | |
216 | struct request_queue *q = bdev->bd_disk->queue; | |
217 | struct request *rq; | |
82ed4db4 | 218 | struct scsi_request *req; |
f99d4fbd CH |
219 | size_t bufflen = 252, len, id_len; |
220 | u8 *buf, *d, type, assoc; | |
221 | int error; | |
222 | ||
30181faa BVA |
223 | if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) |
224 | return -EINVAL; | |
225 | ||
f99d4fbd CH |
226 | buf = kzalloc(bufflen, GFP_KERNEL); |
227 | if (!buf) | |
228 | return -ENOMEM; | |
229 | ||
aebf526b | 230 | rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL); |
f99d4fbd CH |
231 | if (IS_ERR(rq)) { |
232 | error = -ENOMEM; | |
233 | goto out_free_buf; | |
234 | } | |
82ed4db4 | 235 | req = scsi_req(rq); |
f99d4fbd CH |
236 | |
237 | error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); | |
238 | if (error) | |
239 | goto out_put_request; | |
240 | ||
82ed4db4 CH |
241 | req->cmd[0] = INQUIRY; |
242 | req->cmd[1] = 1; | |
243 | req->cmd[2] = 0x83; | |
244 | req->cmd[3] = bufflen >> 8; | |
245 | req->cmd[4] = bufflen & 0xff; | |
246 | req->cmd_len = COMMAND_SIZE(INQUIRY); | |
f99d4fbd | 247 | |
b7819b92 | 248 | blk_execute_rq(rq->q, NULL, rq, 1); |
17d5363b | 249 | if (req->result) { |
f99d4fbd | 250 | pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", |
17d5363b | 251 | req->result); |
b7819b92 | 252 | error = -EIO; |
f99d4fbd CH |
253 | goto out_put_request; |
254 | } | |
255 | ||
256 | len = (buf[2] << 8) + buf[3] + 4; | |
257 | if (len > bufflen) { | |
258 | pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", | |
259 | len); | |
260 | goto out_put_request; | |
261 | } | |
262 | ||
263 | d = buf + 4; | |
264 | for (d = buf + 4; d < buf + len; d += id_len + 4) { | |
265 | id_len = d[3]; | |
266 | type = d[1] & 0xf; | |
267 | assoc = (d[1] >> 4) & 0x3; | |
268 | ||
269 | /* | |
270 | * We only care about a EUI-64 and NAA designator types | |
271 | * with LU association. | |
272 | */ | |
273 | if (assoc != 0x00) | |
274 | continue; | |
275 | if (type != 0x02 && type != 0x03) | |
276 | continue; | |
277 | if (id_len != 8 && id_len != 12 && id_len != 16) | |
278 | continue; | |
279 | ||
280 | b->scsi.code_set = PS_CODE_SET_BINARY; | |
281 | b->scsi.designator_type = type == 0x02 ? | |
282 | PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; | |
283 | b->scsi.designator_len = id_len; | |
284 | memcpy(b->scsi.designator, d + 4, id_len); | |
285 | ||
286 | /* | |
287 | * If we found a 8 or 12 byte descriptor continue on to | |
288 | * see if a 16 byte one is available. If we find a | |
289 | * 16 byte descriptor we're done. | |
290 | */ | |
291 | if (id_len == 16) | |
292 | break; | |
293 | } | |
294 | ||
295 | out_put_request: | |
296 | blk_put_request(rq); | |
297 | out_free_buf: | |
298 | kfree(buf); | |
299 | return error; | |
300 | } | |
301 | ||
eee93016 | 302 | #define NFSD_MDS_PR_KEY 0x0100000000000000ULL |
f99d4fbd CH |
303 | |
304 | /* | |
305 | * We use the client ID as a unique key for the reservations. | |
306 | * This allows us to easily fence a client when recalls fail. | |
307 | */ | |
308 | static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) | |
309 | { | |
310 | return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; | |
311 | } | |
312 | ||
313 | static int | |
314 | nfsd4_block_get_device_info_scsi(struct super_block *sb, | |
315 | struct nfs4_client *clp, | |
316 | struct nfsd4_getdeviceinfo *gdp) | |
317 | { | |
318 | struct pnfs_block_deviceaddr *dev; | |
319 | struct pnfs_block_volume *b; | |
320 | const struct pr_ops *ops; | |
321 | int error; | |
322 | ||
323 | dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + | |
324 | sizeof(struct pnfs_block_volume), GFP_KERNEL); | |
325 | if (!dev) | |
326 | return -ENOMEM; | |
327 | gdp->gd_device = dev; | |
328 | ||
329 | dev->nr_volumes = 1; | |
330 | b = &dev->volumes[0]; | |
331 | ||
332 | b->type = PNFS_BLOCK_VOLUME_SCSI; | |
333 | b->scsi.pr_key = nfsd4_scsi_pr_key(clp); | |
334 | ||
335 | error = nfsd4_scsi_identify_device(sb->s_bdev, b); | |
336 | if (error) | |
337 | return error; | |
338 | ||
339 | ops = sb->s_bdev->bd_disk->fops->pr_ops; | |
340 | if (!ops) { | |
341 | pr_err("pNFS: device %s does not support PRs.\n", | |
342 | sb->s_id); | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
346 | error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); | |
347 | if (error) { | |
348 | pr_err("pNFS: failed to register key for device %s.\n", | |
349 | sb->s_id); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
353 | error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, | |
354 | PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); | |
355 | if (error) { | |
356 | pr_err("pNFS: failed to reserve device %s.\n", | |
357 | sb->s_id); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static __be32 | |
365 | nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, | |
d7c920d1 | 366 | struct svc_rqst *rqstp, |
f99d4fbd CH |
367 | struct nfs4_client *clp, |
368 | struct nfsd4_getdeviceinfo *gdp) | |
369 | { | |
370 | if (sb->s_bdev != sb->s_bdev->bd_contains) | |
371 | return nfserr_inval; | |
372 | return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); | |
373 | } | |
374 | static __be32 | |
375 | nfsd4_scsi_proc_layoutcommit(struct inode *inode, | |
376 | struct nfsd4_layoutcommit *lcp) | |
377 | { | |
378 | struct iomap *iomaps; | |
379 | int nr_iomaps; | |
380 | ||
381 | nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, | |
93407472 | 382 | lcp->lc_up_len, &iomaps, i_blocksize(inode)); |
f99d4fbd CH |
383 | if (nr_iomaps < 0) |
384 | return nfserrno(nr_iomaps); | |
385 | ||
386 | return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); | |
387 | } | |
388 | ||
389 | static void | |
390 | nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) | |
391 | { | |
392 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
393 | struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev; | |
394 | ||
395 | bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, | |
396 | nfsd4_scsi_pr_key(clp), 0, true); | |
397 | } | |
398 | ||
399 | const struct nfsd4_layout_ops scsi_layout_ops = { | |
400 | /* | |
401 | * Pretend that we send notification to the client. This is a blatant | |
402 | * lie to force recent Linux clients to cache our device IDs. | |
403 | * We rarely ever change the device ID, so the harm of leaking deviceids | |
404 | * for a while isn't too bad. Unfortunately RFC5661 is a complete mess | |
405 | * in this regard, but I filed errata 4119 for this a while ago, and | |
406 | * hopefully the Linux client will eventually start caching deviceids | |
407 | * without this again. | |
408 | */ | |
409 | .notify_types = | |
410 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, | |
411 | .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, | |
412 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
413 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
414 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
415 | .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, | |
416 | .fence_client = nfsd4_scsi_fence_client, | |
417 | }; | |
418 | #endif /* CONFIG_NFSD_SCSILAYOUT */ |