1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014-2016 Christoph Hellwig. 4 */ 5 #include <linux/exportfs.h> 6 #include <linux/iomap.h> 7 #include <linux/genhd.h> 8 #include <linux/slab.h> 9 #include <linux/pr.h> 10 11 #include <linux/nfsd/debug.h> 12 #include <scsi/scsi_proto.h> 13 #include <scsi/scsi_common.h> 14 #include <scsi/scsi_request.h> 15 16 #include "blocklayoutxdr.h" 17 #include "pnfs.h" 18 19 #define NFSDDBG_FACILITY NFSDDBG_PNFS 20 21 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; 28 u32 block_size = i_blocksize(inode); 29 struct pnfs_block_extent *bex; 30 struct iomap iomap; 31 u32 device_generation = 0; 32 int error; 33 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; 69 bex->soff = iomap.addr; 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; 82 bex->soff = iomap.addr; 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; 106 107 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); 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 119 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, 120 struct iomap *iomaps, int nr_iomaps) 121 { 122 loff_t new_size = lcp->lc_last_wr + 1; 123 struct iattr iattr = { .ia_valid = 0 }; 124 struct timespec ts; 125 int error; 126 127 ts = timespec64_to_timespec(inode->i_mtime); 128 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 129 timespec_compare(&lcp->lc_mtime, &ts) < 0) 130 lcp->lc_mtime = timespec64_to_timespec(current_time(inode)); 131 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; 132 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = timespec_to_timespec64(lcp->lc_mtime); 133 134 if (new_size > i_size_read(inode)) { 135 iattr.ia_valid |= ATTR_SIZE; 136 iattr.ia_size = new_size; 137 } 138 139 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, 140 nr_iomaps, &iattr); 141 kfree(iomaps); 142 return nfserrno(error); 143 } 144 145 #ifdef CONFIG_NFSD_BLOCKLAYOUT 146 static int 147 nfsd4_block_get_device_info_simple(struct super_block *sb, 148 struct nfsd4_getdeviceinfo *gdp) 149 { 150 struct pnfs_block_deviceaddr *dev; 151 struct pnfs_block_volume *b; 152 153 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 154 sizeof(struct pnfs_block_volume), GFP_KERNEL); 155 if (!dev) 156 return -ENOMEM; 157 gdp->gd_device = dev; 158 159 dev->nr_volumes = 1; 160 b = &dev->volumes[0]; 161 162 b->type = PNFS_BLOCK_VOLUME_SIMPLE; 163 b->simple.sig_len = PNFS_BLOCK_UUID_LEN; 164 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, 165 &b->simple.offset); 166 } 167 168 static __be32 169 nfsd4_block_proc_getdeviceinfo(struct super_block *sb, 170 struct svc_rqst *rqstp, 171 struct nfs4_client *clp, 172 struct nfsd4_getdeviceinfo *gdp) 173 { 174 if (sb->s_bdev != sb->s_bdev->bd_contains) 175 return nfserr_inval; 176 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); 177 } 178 179 static __be32 180 nfsd4_block_proc_layoutcommit(struct inode *inode, 181 struct nfsd4_layoutcommit *lcp) 182 { 183 struct iomap *iomaps; 184 int nr_iomaps; 185 186 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, 187 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 188 if (nr_iomaps < 0) 189 return nfserrno(nr_iomaps); 190 191 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 192 } 193 194 const struct nfsd4_layout_ops bl_layout_ops = { 195 /* 196 * Pretend that we send notification to the client. This is a blatant 197 * lie to force recent Linux clients to cache our device IDs. 198 * We rarely ever change the device ID, so the harm of leaking deviceids 199 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 200 * in this regard, but I filed errata 4119 for this a while ago, and 201 * hopefully the Linux client will eventually start caching deviceids 202 * without this again. 203 */ 204 .notify_types = 205 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 206 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, 207 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 208 .proc_layoutget = nfsd4_block_proc_layoutget, 209 .encode_layoutget = nfsd4_block_encode_layoutget, 210 .proc_layoutcommit = nfsd4_block_proc_layoutcommit, 211 }; 212 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 213 214 #ifdef CONFIG_NFSD_SCSILAYOUT 215 static int nfsd4_scsi_identify_device(struct block_device *bdev, 216 struct pnfs_block_volume *b) 217 { 218 struct request_queue *q = bdev->bd_disk->queue; 219 struct request *rq; 220 struct scsi_request *req; 221 /* 222 * The allocation length (passed in bytes 3 and 4 of the INQUIRY 223 * command descriptor block) specifies the number of bytes that have 224 * been allocated for the data-in buffer. 225 * 252 is the highest one-byte value that is a multiple of 4. 226 * 65532 is the highest two-byte value that is a multiple of 4. 227 */ 228 size_t bufflen = 252, maxlen = 65532, len, id_len; 229 u8 *buf, *d, type, assoc; 230 int retries = 1, error; 231 232 if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) 233 return -EINVAL; 234 235 again: 236 buf = kzalloc(bufflen, GFP_KERNEL); 237 if (!buf) 238 return -ENOMEM; 239 240 rq = blk_get_request(q, REQ_OP_SCSI_IN, 0); 241 if (IS_ERR(rq)) { 242 error = -ENOMEM; 243 goto out_free_buf; 244 } 245 req = scsi_req(rq); 246 247 error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); 248 if (error) 249 goto out_put_request; 250 251 req->cmd[0] = INQUIRY; 252 req->cmd[1] = 1; 253 req->cmd[2] = 0x83; 254 req->cmd[3] = bufflen >> 8; 255 req->cmd[4] = bufflen & 0xff; 256 req->cmd_len = COMMAND_SIZE(INQUIRY); 257 258 blk_execute_rq(rq->q, NULL, rq, 1); 259 if (req->result) { 260 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", 261 req->result); 262 error = -EIO; 263 goto out_put_request; 264 } 265 266 len = (buf[2] << 8) + buf[3] + 4; 267 if (len > bufflen) { 268 if (len <= maxlen && retries--) { 269 blk_put_request(rq); 270 kfree(buf); 271 bufflen = len; 272 goto again; 273 } 274 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", 275 len); 276 goto out_put_request; 277 } 278 279 d = buf + 4; 280 for (d = buf + 4; d < buf + len; d += id_len + 4) { 281 id_len = d[3]; 282 type = d[1] & 0xf; 283 assoc = (d[1] >> 4) & 0x3; 284 285 /* 286 * We only care about a EUI-64 and NAA designator types 287 * with LU association. 288 */ 289 if (assoc != 0x00) 290 continue; 291 if (type != 0x02 && type != 0x03) 292 continue; 293 if (id_len != 8 && id_len != 12 && id_len != 16) 294 continue; 295 296 b->scsi.code_set = PS_CODE_SET_BINARY; 297 b->scsi.designator_type = type == 0x02 ? 298 PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; 299 b->scsi.designator_len = id_len; 300 memcpy(b->scsi.designator, d + 4, id_len); 301 302 /* 303 * If we found a 8 or 12 byte descriptor continue on to 304 * see if a 16 byte one is available. If we find a 305 * 16 byte descriptor we're done. 306 */ 307 if (id_len == 16) 308 break; 309 } 310 311 out_put_request: 312 blk_put_request(rq); 313 out_free_buf: 314 kfree(buf); 315 return error; 316 } 317 318 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 319 320 /* 321 * We use the client ID as a unique key for the reservations. 322 * This allows us to easily fence a client when recalls fail. 323 */ 324 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) 325 { 326 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; 327 } 328 329 static int 330 nfsd4_block_get_device_info_scsi(struct super_block *sb, 331 struct nfs4_client *clp, 332 struct nfsd4_getdeviceinfo *gdp) 333 { 334 struct pnfs_block_deviceaddr *dev; 335 struct pnfs_block_volume *b; 336 const struct pr_ops *ops; 337 int error; 338 339 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 340 sizeof(struct pnfs_block_volume), GFP_KERNEL); 341 if (!dev) 342 return -ENOMEM; 343 gdp->gd_device = dev; 344 345 dev->nr_volumes = 1; 346 b = &dev->volumes[0]; 347 348 b->type = PNFS_BLOCK_VOLUME_SCSI; 349 b->scsi.pr_key = nfsd4_scsi_pr_key(clp); 350 351 error = nfsd4_scsi_identify_device(sb->s_bdev, b); 352 if (error) 353 return error; 354 355 ops = sb->s_bdev->bd_disk->fops->pr_ops; 356 if (!ops) { 357 pr_err("pNFS: device %s does not support PRs.\n", 358 sb->s_id); 359 return -EINVAL; 360 } 361 362 error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); 363 if (error) { 364 pr_err("pNFS: failed to register key for device %s.\n", 365 sb->s_id); 366 return -EINVAL; 367 } 368 369 error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, 370 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); 371 if (error) { 372 pr_err("pNFS: failed to reserve device %s.\n", 373 sb->s_id); 374 return -EINVAL; 375 } 376 377 return 0; 378 } 379 380 static __be32 381 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, 382 struct svc_rqst *rqstp, 383 struct nfs4_client *clp, 384 struct nfsd4_getdeviceinfo *gdp) 385 { 386 if (sb->s_bdev != sb->s_bdev->bd_contains) 387 return nfserr_inval; 388 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); 389 } 390 static __be32 391 nfsd4_scsi_proc_layoutcommit(struct inode *inode, 392 struct nfsd4_layoutcommit *lcp) 393 { 394 struct iomap *iomaps; 395 int nr_iomaps; 396 397 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, 398 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 399 if (nr_iomaps < 0) 400 return nfserrno(nr_iomaps); 401 402 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 403 } 404 405 static void 406 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) 407 { 408 struct nfs4_client *clp = ls->ls_stid.sc_client; 409 struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev; 410 411 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, 412 nfsd4_scsi_pr_key(clp), 0, true); 413 } 414 415 const struct nfsd4_layout_ops scsi_layout_ops = { 416 /* 417 * Pretend that we send notification to the client. This is a blatant 418 * lie to force recent Linux clients to cache our device IDs. 419 * We rarely ever change the device ID, so the harm of leaking deviceids 420 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 421 * in this regard, but I filed errata 4119 for this a while ago, and 422 * hopefully the Linux client will eventually start caching deviceids 423 * without this again. 424 */ 425 .notify_types = 426 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 427 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, 428 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 429 .proc_layoutget = nfsd4_block_proc_layoutget, 430 .encode_layoutget = nfsd4_block_encode_layoutget, 431 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, 432 .fence_client = nfsd4_scsi_fence_client, 433 }; 434 #endif /* CONFIG_NFSD_SCSILAYOUT */ 435