Commit | Line | Data |
---|---|---|
8650b8a0 | 1 | /* |
f99d4fbd | 2 | * Copyright (c) 2014-2016 Christoph Hellwig. |
8650b8a0 CH |
3 | */ |
4 | #include <linux/exportfs.h> | |
5 | #include <linux/genhd.h> | |
6 | #include <linux/slab.h> | |
f99d4fbd | 7 | #include <linux/pr.h> |
8650b8a0 CH |
8 | |
9 | #include <linux/nfsd/debug.h> | |
f99d4fbd CH |
10 | #include <scsi/scsi_proto.h> |
11 | #include <scsi/scsi_common.h> | |
8650b8a0 CH |
12 | |
13 | #include "blocklayoutxdr.h" | |
14 | #include "pnfs.h" | |
15 | ||
16 | #define NFSDDBG_FACILITY NFSDDBG_PNFS | |
17 | ||
18 | ||
8650b8a0 CH |
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 | ||
8650b8a0 CH |
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 | ||
85369523 | 104 | dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); |
8650b8a0 CH |
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 | |
368248ee CH |
116 | nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, |
117 | struct iomap *iomaps, int nr_iomaps) | |
8650b8a0 CH |
118 | { |
119 | loff_t new_size = lcp->lc_last_wr + 1; | |
120 | struct iattr iattr = { .ia_valid = 0 }; | |
8650b8a0 CH |
121 | int error; |
122 | ||
8650b8a0 CH |
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 | ||
368248ee CH |
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, | |
d7c920d1 | 165 | struct svc_rqst *rqstp, |
f99d4fbd | 166 | struct nfs4_client *clp, |
368248ee CH |
167 | struct nfsd4_getdeviceinfo *gdp) |
168 | { | |
169 | if (sb->s_bdev != sb->s_bdev->bd_contains) | |
170 | return nfserr_inval; | |
171 | return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); | |
172 | } | |
173 | ||
174 | static __be32 | |
175 | nfsd4_block_proc_layoutcommit(struct inode *inode, | |
176 | struct nfsd4_layoutcommit *lcp) | |
177 | { | |
178 | struct iomap *iomaps; | |
179 | int nr_iomaps; | |
180 | ||
181 | nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, | |
182 | lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits); | |
183 | if (nr_iomaps < 0) | |
184 | return nfserrno(nr_iomaps); | |
185 | ||
186 | return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); | |
187 | } | |
188 | ||
8650b8a0 | 189 | const struct nfsd4_layout_ops bl_layout_ops = { |
40cdc7a5 CH |
190 | /* |
191 | * Pretend that we send notification to the client. This is a blatant | |
192 | * lie to force recent Linux clients to cache our device IDs. | |
193 | * We rarely ever change the device ID, so the harm of leaking deviceids | |
194 | * for a while isn't too bad. Unfortunately RFC5661 is a complete mess | |
195 | * in this regard, but I filed errata 4119 for this a while ago, and | |
196 | * hopefully the Linux client will eventually start caching deviceids | |
197 | * without this again. | |
198 | */ | |
199 | .notify_types = | |
200 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, | |
8650b8a0 CH |
201 | .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, |
202 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
203 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
204 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
205 | .proc_layoutcommit = nfsd4_block_proc_layoutcommit, | |
206 | }; | |
368248ee | 207 | #endif /* CONFIG_NFSD_BLOCKLAYOUT */ |
f99d4fbd CH |
208 | |
209 | #ifdef CONFIG_NFSD_SCSILAYOUT | |
210 | static int nfsd4_scsi_identify_device(struct block_device *bdev, | |
211 | struct pnfs_block_volume *b) | |
212 | { | |
213 | struct request_queue *q = bdev->bd_disk->queue; | |
214 | struct request *rq; | |
215 | size_t bufflen = 252, len, id_len; | |
216 | u8 *buf, *d, type, assoc; | |
217 | int error; | |
218 | ||
219 | buf = kzalloc(bufflen, GFP_KERNEL); | |
220 | if (!buf) | |
221 | return -ENOMEM; | |
222 | ||
223 | rq = blk_get_request(q, READ, GFP_KERNEL); | |
224 | if (IS_ERR(rq)) { | |
225 | error = -ENOMEM; | |
226 | goto out_free_buf; | |
227 | } | |
228 | blk_rq_set_block_pc(rq); | |
229 | ||
230 | error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); | |
231 | if (error) | |
232 | goto out_put_request; | |
233 | ||
234 | rq->cmd[0] = INQUIRY; | |
235 | rq->cmd[1] = 1; | |
236 | rq->cmd[2] = 0x83; | |
237 | rq->cmd[3] = bufflen >> 8; | |
238 | rq->cmd[4] = bufflen & 0xff; | |
239 | rq->cmd_len = COMMAND_SIZE(INQUIRY); | |
240 | ||
241 | error = blk_execute_rq(rq->q, NULL, rq, 1); | |
242 | if (error) { | |
243 | pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", | |
244 | rq->errors); | |
245 | goto out_put_request; | |
246 | } | |
247 | ||
248 | len = (buf[2] << 8) + buf[3] + 4; | |
249 | if (len > bufflen) { | |
250 | pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", | |
251 | len); | |
252 | goto out_put_request; | |
253 | } | |
254 | ||
255 | d = buf + 4; | |
256 | for (d = buf + 4; d < buf + len; d += id_len + 4) { | |
257 | id_len = d[3]; | |
258 | type = d[1] & 0xf; | |
259 | assoc = (d[1] >> 4) & 0x3; | |
260 | ||
261 | /* | |
262 | * We only care about a EUI-64 and NAA designator types | |
263 | * with LU association. | |
264 | */ | |
265 | if (assoc != 0x00) | |
266 | continue; | |
267 | if (type != 0x02 && type != 0x03) | |
268 | continue; | |
269 | if (id_len != 8 && id_len != 12 && id_len != 16) | |
270 | continue; | |
271 | ||
272 | b->scsi.code_set = PS_CODE_SET_BINARY; | |
273 | b->scsi.designator_type = type == 0x02 ? | |
274 | PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; | |
275 | b->scsi.designator_len = id_len; | |
276 | memcpy(b->scsi.designator, d + 4, id_len); | |
277 | ||
278 | /* | |
279 | * If we found a 8 or 12 byte descriptor continue on to | |
280 | * see if a 16 byte one is available. If we find a | |
281 | * 16 byte descriptor we're done. | |
282 | */ | |
283 | if (id_len == 16) | |
284 | break; | |
285 | } | |
286 | ||
287 | out_put_request: | |
288 | blk_put_request(rq); | |
289 | out_free_buf: | |
290 | kfree(buf); | |
291 | return error; | |
292 | } | |
293 | ||
eee93016 | 294 | #define NFSD_MDS_PR_KEY 0x0100000000000000ULL |
f99d4fbd CH |
295 | |
296 | /* | |
297 | * We use the client ID as a unique key for the reservations. | |
298 | * This allows us to easily fence a client when recalls fail. | |
299 | */ | |
300 | static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) | |
301 | { | |
302 | return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; | |
303 | } | |
304 | ||
305 | static int | |
306 | nfsd4_block_get_device_info_scsi(struct super_block *sb, | |
307 | struct nfs4_client *clp, | |
308 | struct nfsd4_getdeviceinfo *gdp) | |
309 | { | |
310 | struct pnfs_block_deviceaddr *dev; | |
311 | struct pnfs_block_volume *b; | |
312 | const struct pr_ops *ops; | |
313 | int error; | |
314 | ||
315 | dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + | |
316 | sizeof(struct pnfs_block_volume), GFP_KERNEL); | |
317 | if (!dev) | |
318 | return -ENOMEM; | |
319 | gdp->gd_device = dev; | |
320 | ||
321 | dev->nr_volumes = 1; | |
322 | b = &dev->volumes[0]; | |
323 | ||
324 | b->type = PNFS_BLOCK_VOLUME_SCSI; | |
325 | b->scsi.pr_key = nfsd4_scsi_pr_key(clp); | |
326 | ||
327 | error = nfsd4_scsi_identify_device(sb->s_bdev, b); | |
328 | if (error) | |
329 | return error; | |
330 | ||
331 | ops = sb->s_bdev->bd_disk->fops->pr_ops; | |
332 | if (!ops) { | |
333 | pr_err("pNFS: device %s does not support PRs.\n", | |
334 | sb->s_id); | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); | |
339 | if (error) { | |
340 | pr_err("pNFS: failed to register key for device %s.\n", | |
341 | sb->s_id); | |
342 | return -EINVAL; | |
343 | } | |
344 | ||
345 | error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, | |
346 | PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); | |
347 | if (error) { | |
348 | pr_err("pNFS: failed to reserve device %s.\n", | |
349 | sb->s_id); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static __be32 | |
357 | nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, | |
d7c920d1 | 358 | struct svc_rqst *rqstp, |
f99d4fbd CH |
359 | struct nfs4_client *clp, |
360 | struct nfsd4_getdeviceinfo *gdp) | |
361 | { | |
362 | if (sb->s_bdev != sb->s_bdev->bd_contains) | |
363 | return nfserr_inval; | |
364 | return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); | |
365 | } | |
366 | static __be32 | |
367 | nfsd4_scsi_proc_layoutcommit(struct inode *inode, | |
368 | struct nfsd4_layoutcommit *lcp) | |
369 | { | |
370 | struct iomap *iomaps; | |
371 | int nr_iomaps; | |
372 | ||
373 | nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, | |
374 | lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits); | |
375 | if (nr_iomaps < 0) | |
376 | return nfserrno(nr_iomaps); | |
377 | ||
378 | return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); | |
379 | } | |
380 | ||
381 | static void | |
382 | nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) | |
383 | { | |
384 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
385 | struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev; | |
386 | ||
387 | bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, | |
388 | nfsd4_scsi_pr_key(clp), 0, true); | |
389 | } | |
390 | ||
391 | const struct nfsd4_layout_ops scsi_layout_ops = { | |
392 | /* | |
393 | * Pretend that we send notification to the client. This is a blatant | |
394 | * lie to force recent Linux clients to cache our device IDs. | |
395 | * We rarely ever change the device ID, so the harm of leaking deviceids | |
396 | * for a while isn't too bad. Unfortunately RFC5661 is a complete mess | |
397 | * in this regard, but I filed errata 4119 for this a while ago, and | |
398 | * hopefully the Linux client will eventually start caching deviceids | |
399 | * without this again. | |
400 | */ | |
401 | .notify_types = | |
402 | NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, | |
403 | .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, | |
404 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
405 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
406 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
407 | .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, | |
408 | .fence_client = nfsd4_scsi_fence_client, | |
409 | }; | |
410 | #endif /* CONFIG_NFSD_SCSILAYOUT */ |