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 #include "filecache.h" 19 20 #define NFSDDBG_FACILITY NFSDDBG_PNFS 21 22 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; 29 u32 block_size = i_blocksize(inode); 30 struct pnfs_block_extent *bex; 31 struct iomap iomap; 32 u32 device_generation = 0; 33 int error; 34 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; 70 bex->soff = iomap.addr; 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; 83 bex->soff = iomap.addr; 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; 107 108 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); 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 120 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, 121 struct iomap *iomaps, int nr_iomaps) 122 { 123 loff_t new_size = lcp->lc_last_wr + 1; 124 struct iattr iattr = { .ia_valid = 0 }; 125 int error; 126 127 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 128 timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) 129 lcp->lc_mtime = current_time(inode); 130 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; 131 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; 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 } 143 144 #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, 169 struct svc_rqst *rqstp, 170 struct nfs4_client *clp, 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, 186 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 187 if (nr_iomaps < 0) 188 return nfserrno(nr_iomaps); 189 190 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 191 } 192 193 const struct nfsd4_layout_ops bl_layout_ops = { 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, 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 }; 211 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 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; 219 struct scsi_request *req; 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; 228 u8 *buf, *d, type, assoc; 229 int retries = 1, error; 230 231 if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) 232 return -EINVAL; 233 234 again: 235 buf = kzalloc(bufflen, GFP_KERNEL); 236 if (!buf) 237 return -ENOMEM; 238 239 rq = blk_get_request(q, REQ_OP_SCSI_IN, 0); 240 if (IS_ERR(rq)) { 241 error = -ENOMEM; 242 goto out_free_buf; 243 } 244 req = scsi_req(rq); 245 246 error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); 247 if (error) 248 goto out_put_request; 249 250 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); 256 257 blk_execute_rq(rq->q, NULL, rq, 1); 258 if (req->result) { 259 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", 260 req->result); 261 error = -EIO; 262 goto out_put_request; 263 } 264 265 len = (buf[2] << 8) + buf[3] + 4; 266 if (len > bufflen) { 267 if (len <= maxlen && retries--) { 268 blk_put_request(rq); 269 kfree(buf); 270 bufflen = len; 271 goto again; 272 } 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 } 316 317 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 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, 381 struct svc_rqst *rqstp, 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, 397 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 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; 408 struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev; 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 */ 434