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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" | |
eb82dd39 | 18 | #include "filecache.h" |
8650b8a0 CH |
19 | |
20 | #define NFSDDBG_FACILITY NFSDDBG_PNFS | |
21 | ||
22 | ||
8650b8a0 CH |
23 | static __be32 |
24 | nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, | |
25 | struct nfsd4_layoutget *args) | |
26 | { | |
27 | struct nfsd4_layout_seg *seg = &args->lg_seg; | |
28 | struct super_block *sb = inode->i_sb; | |
93407472 | 29 | u32 block_size = i_blocksize(inode); |
8650b8a0 CH |
30 | struct pnfs_block_extent *bex; |
31 | struct iomap iomap; | |
32 | u32 device_generation = 0; | |
33 | int error; | |
34 | ||
8650b8a0 CH |
35 | if (seg->offset & (block_size - 1)) { |
36 | dprintk("pnfsd: I/O misaligned\n"); | |
37 | goto out_layoutunavailable; | |
38 | } | |
39 | ||
40 | /* | |
41 | * Some clients barf on non-zero block numbers for NONE or INVALID | |
42 | * layouts, so make sure to zero the whole structure. | |
43 | */ | |
44 | error = -ENOMEM; | |
45 | bex = kzalloc(sizeof(*bex), GFP_KERNEL); | |
46 | if (!bex) | |
47 | goto out_error; | |
48 | args->lg_content = bex; | |
49 | ||
50 | error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, | |
51 | &iomap, seg->iomode != IOMODE_READ, | |
52 | &device_generation); | |
53 | if (error) { | |
54 | if (error == -ENXIO) | |
55 | goto out_layoutunavailable; | |
56 | goto out_error; | |
57 | } | |
58 | ||
59 | if (iomap.length < args->lg_minlength) { | |
60 | dprintk("pnfsd: extent smaller than minlength\n"); | |
61 | goto out_layoutunavailable; | |
62 | } | |
63 | ||
64 | switch (iomap.type) { | |
65 | case IOMAP_MAPPED: | |
66 | if (seg->iomode == IOMODE_READ) | |
67 | bex->es = PNFS_BLOCK_READ_DATA; | |
68 | else | |
69 | bex->es = PNFS_BLOCK_READWRITE_DATA; | |
19fe5f64 | 70 | bex->soff = iomap.addr; |
8650b8a0 CH |
71 | break; |
72 | case IOMAP_UNWRITTEN: | |
73 | if (seg->iomode & IOMODE_RW) { | |
74 | /* | |
75 | * Crack monkey special case from section 2.3.1. | |
76 | */ | |
77 | if (args->lg_minlength == 0) { | |
78 | dprintk("pnfsd: no soup for you!\n"); | |
79 | goto out_layoutunavailable; | |
80 | } | |
81 | ||
82 | bex->es = PNFS_BLOCK_INVALID_DATA; | |
19fe5f64 | 83 | bex->soff = iomap.addr; |
8650b8a0 CH |
84 | break; |
85 | } | |
86 | /*FALLTHRU*/ | |
87 | case IOMAP_HOLE: | |
88 | if (seg->iomode == IOMODE_READ) { | |
89 | bex->es = PNFS_BLOCK_NONE_DATA; | |
90 | break; | |
91 | } | |
92 | /*FALLTHRU*/ | |
93 | case IOMAP_DELALLOC: | |
94 | default: | |
95 | WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); | |
96 | goto out_layoutunavailable; | |
97 | } | |
98 | ||
99 | error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); | |
100 | if (error) | |
101 | goto out_error; | |
102 | bex->foff = iomap.offset; | |
103 | bex->len = iomap.length; | |
104 | ||
105 | seg->offset = iomap.offset; | |
106 | seg->length = iomap.length; | |
107 | ||
85369523 | 108 | dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); |
8650b8a0 CH |
109 | return 0; |
110 | ||
111 | out_error: | |
112 | seg->length = 0; | |
113 | return nfserrno(error); | |
114 | out_layoutunavailable: | |
115 | seg->length = 0; | |
116 | return nfserr_layoutunavailable; | |
117 | } | |
118 | ||
119 | static __be32 | |
368248ee CH |
120 | nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, |
121 | struct iomap *iomaps, int nr_iomaps) | |
8650b8a0 CH |
122 | { |
123 | loff_t new_size = lcp->lc_last_wr + 1; | |
124 | struct iattr iattr = { .ia_valid = 0 }; | |
8650b8a0 CH |
125 | int error; |
126 | ||
8650b8a0 | 127 | if (lcp->lc_mtime.tv_nsec == UTIME_NOW || |
bdba5368 BF |
128 | timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) |
129 | lcp->lc_mtime = current_time(inode); | |
8650b8a0 | 130 | iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; |
bdba5368 | 131 | iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; |
8650b8a0 CH |
132 | |
133 | if (new_size > i_size_read(inode)) { | |
134 | iattr.ia_valid |= ATTR_SIZE; | |
135 | iattr.ia_size = new_size; | |
136 | } | |
137 | ||
138 | error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, | |
139 | nr_iomaps, &iattr); | |
140 | kfree(iomaps); | |
141 | return nfserrno(error); | |
142 | } | |
143 | ||
368248ee CH |
144 | #ifdef CONFIG_NFSD_BLOCKLAYOUT |
145 | static int | |
146 | nfsd4_block_get_device_info_simple(struct super_block *sb, | |
147 | struct nfsd4_getdeviceinfo *gdp) | |
148 | { | |
149 | struct pnfs_block_deviceaddr *dev; | |
150 | struct pnfs_block_volume *b; | |
151 | ||
152 | dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + | |
153 | sizeof(struct pnfs_block_volume), GFP_KERNEL); | |
154 | if (!dev) | |
155 | return -ENOMEM; | |
156 | gdp->gd_device = dev; | |
157 | ||
158 | dev->nr_volumes = 1; | |
159 | b = &dev->volumes[0]; | |
160 | ||
161 | b->type = PNFS_BLOCK_VOLUME_SIMPLE; | |
162 | b->simple.sig_len = PNFS_BLOCK_UUID_LEN; | |
163 | return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, | |
164 | &b->simple.offset); | |
165 | } | |
166 | ||
167 | static __be32 | |
168 | nfsd4_block_proc_getdeviceinfo(struct super_block *sb, | |
d7c920d1 | 169 | struct svc_rqst *rqstp, |
f99d4fbd | 170 | struct nfs4_client *clp, |
368248ee CH |
171 | struct nfsd4_getdeviceinfo *gdp) |
172 | { | |
173 | if (sb->s_bdev != sb->s_bdev->bd_contains) | |
174 | return nfserr_inval; | |
175 | return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); | |
176 | } | |
177 | ||
178 | static __be32 | |
179 | nfsd4_block_proc_layoutcommit(struct inode *inode, | |
180 | struct nfsd4_layoutcommit *lcp) | |
181 | { | |
182 | struct iomap *iomaps; | |
183 | int nr_iomaps; | |
184 | ||
185 | nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, | |
93407472 | 186 | lcp->lc_up_len, &iomaps, i_blocksize(inode)); |
368248ee CH |
187 | if (nr_iomaps < 0) |
188 | return nfserrno(nr_iomaps); | |
189 | ||
190 | return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); | |
191 | } | |
192 | ||
8650b8a0 | 193 | const struct nfsd4_layout_ops bl_layout_ops = { |
40cdc7a5 CH |
194 | /* |
195 | * Pretend that we send notification to the client. This is a blatant | |
196 | * lie to force recent Linux clients to cache our device IDs. | |
197 | * We rarely ever change the device ID, so the harm of leaking deviceids | |
198 | * for a while isn't too bad. Unfortunately RFC5661 is a complete mess | |
199 | * in this regard, but I filed errata 4119 for this a while ago, and | |
200 | * hopefully the Linux client will eventually start caching deviceids | |
201 | * without this again. | |
202 | */ | |
203 | .notify_types = | |
204 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, | |
8650b8a0 CH |
205 | .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, |
206 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
207 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
208 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
209 | .proc_layoutcommit = nfsd4_block_proc_layoutcommit, | |
210 | }; | |
368248ee | 211 | #endif /* CONFIG_NFSD_BLOCKLAYOUT */ |
f99d4fbd CH |
212 | |
213 | #ifdef CONFIG_NFSD_SCSILAYOUT | |
214 | static int nfsd4_scsi_identify_device(struct block_device *bdev, | |
215 | struct pnfs_block_volume *b) | |
216 | { | |
217 | struct request_queue *q = bdev->bd_disk->queue; | |
218 | struct request *rq; | |
82ed4db4 | 219 | struct scsi_request *req; |
dac27072 SM |
220 | /* |
221 | * The allocation length (passed in bytes 3 and 4 of the INQUIRY | |
222 | * command descriptor block) specifies the number of bytes that have | |
223 | * been allocated for the data-in buffer. | |
224 | * 252 is the highest one-byte value that is a multiple of 4. | |
225 | * 65532 is the highest two-byte value that is a multiple of 4. | |
226 | */ | |
227 | size_t bufflen = 252, maxlen = 65532, len, id_len; | |
f99d4fbd | 228 | u8 *buf, *d, type, assoc; |
dac27072 | 229 | int retries = 1, error; |
f99d4fbd | 230 | |
30181faa BVA |
231 | if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) |
232 | return -EINVAL; | |
233 | ||
dac27072 | 234 | again: |
f99d4fbd CH |
235 | buf = kzalloc(bufflen, GFP_KERNEL); |
236 | if (!buf) | |
237 | return -ENOMEM; | |
238 | ||
ff005a06 | 239 | rq = blk_get_request(q, REQ_OP_SCSI_IN, 0); |
f99d4fbd CH |
240 | if (IS_ERR(rq)) { |
241 | error = -ENOMEM; | |
242 | goto out_free_buf; | |
243 | } | |
82ed4db4 | 244 | req = scsi_req(rq); |
f99d4fbd CH |
245 | |
246 | error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); | |
247 | if (error) | |
248 | goto out_put_request; | |
249 | ||
82ed4db4 CH |
250 | req->cmd[0] = INQUIRY; |
251 | req->cmd[1] = 1; | |
252 | req->cmd[2] = 0x83; | |
253 | req->cmd[3] = bufflen >> 8; | |
254 | req->cmd[4] = bufflen & 0xff; | |
255 | req->cmd_len = COMMAND_SIZE(INQUIRY); | |
f99d4fbd | 256 | |
b7819b92 | 257 | blk_execute_rq(rq->q, NULL, rq, 1); |
17d5363b | 258 | if (req->result) { |
f99d4fbd | 259 | pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", |
17d5363b | 260 | req->result); |
b7819b92 | 261 | error = -EIO; |
f99d4fbd CH |
262 | goto out_put_request; |
263 | } | |
264 | ||
265 | len = (buf[2] << 8) + buf[3] + 4; | |
266 | if (len > bufflen) { | |
dac27072 SM |
267 | if (len <= maxlen && retries--) { |
268 | blk_put_request(rq); | |
269 | kfree(buf); | |
270 | bufflen = len; | |
271 | goto again; | |
272 | } | |
f99d4fbd CH |
273 | pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", |
274 | len); | |
275 | goto out_put_request; | |
276 | } | |
277 | ||
278 | d = buf + 4; | |
279 | for (d = buf + 4; d < buf + len; d += id_len + 4) { | |
280 | id_len = d[3]; | |
281 | type = d[1] & 0xf; | |
282 | assoc = (d[1] >> 4) & 0x3; | |
283 | ||
284 | /* | |
285 | * We only care about a EUI-64 and NAA designator types | |
286 | * with LU association. | |
287 | */ | |
288 | if (assoc != 0x00) | |
289 | continue; | |
290 | if (type != 0x02 && type != 0x03) | |
291 | continue; | |
292 | if (id_len != 8 && id_len != 12 && id_len != 16) | |
293 | continue; | |
294 | ||
295 | b->scsi.code_set = PS_CODE_SET_BINARY; | |
296 | b->scsi.designator_type = type == 0x02 ? | |
297 | PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; | |
298 | b->scsi.designator_len = id_len; | |
299 | memcpy(b->scsi.designator, d + 4, id_len); | |
300 | ||
301 | /* | |
302 | * If we found a 8 or 12 byte descriptor continue on to | |
303 | * see if a 16 byte one is available. If we find a | |
304 | * 16 byte descriptor we're done. | |
305 | */ | |
306 | if (id_len == 16) | |
307 | break; | |
308 | } | |
309 | ||
310 | out_put_request: | |
311 | blk_put_request(rq); | |
312 | out_free_buf: | |
313 | kfree(buf); | |
314 | return error; | |
315 | } | |
316 | ||
eee93016 | 317 | #define NFSD_MDS_PR_KEY 0x0100000000000000ULL |
f99d4fbd CH |
318 | |
319 | /* | |
320 | * We use the client ID as a unique key for the reservations. | |
321 | * This allows us to easily fence a client when recalls fail. | |
322 | */ | |
323 | static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) | |
324 | { | |
325 | return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; | |
326 | } | |
327 | ||
328 | static int | |
329 | nfsd4_block_get_device_info_scsi(struct super_block *sb, | |
330 | struct nfs4_client *clp, | |
331 | struct nfsd4_getdeviceinfo *gdp) | |
332 | { | |
333 | struct pnfs_block_deviceaddr *dev; | |
334 | struct pnfs_block_volume *b; | |
335 | const struct pr_ops *ops; | |
336 | int error; | |
337 | ||
338 | dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + | |
339 | sizeof(struct pnfs_block_volume), GFP_KERNEL); | |
340 | if (!dev) | |
341 | return -ENOMEM; | |
342 | gdp->gd_device = dev; | |
343 | ||
344 | dev->nr_volumes = 1; | |
345 | b = &dev->volumes[0]; | |
346 | ||
347 | b->type = PNFS_BLOCK_VOLUME_SCSI; | |
348 | b->scsi.pr_key = nfsd4_scsi_pr_key(clp); | |
349 | ||
350 | error = nfsd4_scsi_identify_device(sb->s_bdev, b); | |
351 | if (error) | |
352 | return error; | |
353 | ||
354 | ops = sb->s_bdev->bd_disk->fops->pr_ops; | |
355 | if (!ops) { | |
356 | pr_err("pNFS: device %s does not support PRs.\n", | |
357 | sb->s_id); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); | |
362 | if (error) { | |
363 | pr_err("pNFS: failed to register key for device %s.\n", | |
364 | sb->s_id); | |
365 | return -EINVAL; | |
366 | } | |
367 | ||
368 | error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, | |
369 | PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); | |
370 | if (error) { | |
371 | pr_err("pNFS: failed to reserve device %s.\n", | |
372 | sb->s_id); | |
373 | return -EINVAL; | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
379 | static __be32 | |
380 | nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, | |
d7c920d1 | 381 | struct svc_rqst *rqstp, |
f99d4fbd CH |
382 | struct nfs4_client *clp, |
383 | struct nfsd4_getdeviceinfo *gdp) | |
384 | { | |
385 | if (sb->s_bdev != sb->s_bdev->bd_contains) | |
386 | return nfserr_inval; | |
387 | return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); | |
388 | } | |
389 | static __be32 | |
390 | nfsd4_scsi_proc_layoutcommit(struct inode *inode, | |
391 | struct nfsd4_layoutcommit *lcp) | |
392 | { | |
393 | struct iomap *iomaps; | |
394 | int nr_iomaps; | |
395 | ||
396 | nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, | |
93407472 | 397 | lcp->lc_up_len, &iomaps, i_blocksize(inode)); |
f99d4fbd CH |
398 | if (nr_iomaps < 0) |
399 | return nfserrno(nr_iomaps); | |
400 | ||
401 | return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); | |
402 | } | |
403 | ||
404 | static void | |
405 | nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) | |
406 | { | |
407 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
eb82dd39 | 408 | struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev; |
f99d4fbd CH |
409 | |
410 | bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, | |
411 | nfsd4_scsi_pr_key(clp), 0, true); | |
412 | } | |
413 | ||
414 | const struct nfsd4_layout_ops scsi_layout_ops = { | |
415 | /* | |
416 | * Pretend that we send notification to the client. This is a blatant | |
417 | * lie to force recent Linux clients to cache our device IDs. | |
418 | * We rarely ever change the device ID, so the harm of leaking deviceids | |
419 | * for a while isn't too bad. Unfortunately RFC5661 is a complete mess | |
420 | * in this regard, but I filed errata 4119 for this a while ago, and | |
421 | * hopefully the Linux client will eventually start caching deviceids | |
422 | * without this again. | |
423 | */ | |
424 | .notify_types = | |
425 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, | |
426 | .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, | |
427 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
428 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
429 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
430 | .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, | |
431 | .fence_client = nfsd4_scsi_fence_client, | |
432 | }; | |
433 | #endif /* CONFIG_NFSD_SCSILAYOUT */ |