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 int error; 125 126 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 127 timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) 128 lcp->lc_mtime = current_time(inode); 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 } 142 143 #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, 168 struct svc_rqst *rqstp, 169 struct nfs4_client *clp, 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, 185 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 186 if (nr_iomaps < 0) 187 return nfserrno(nr_iomaps); 188 189 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 190 } 191 192 const struct nfsd4_layout_ops bl_layout_ops = { 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, 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 }; 210 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 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; 218 struct scsi_request *req; 219 size_t bufflen = 252, len, id_len; 220 u8 *buf, *d, type, assoc; 221 int error; 222 223 if (WARN_ON_ONCE(!blk_queue_scsi_passthrough(q))) 224 return -EINVAL; 225 226 buf = kzalloc(bufflen, GFP_KERNEL); 227 if (!buf) 228 return -ENOMEM; 229 230 rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL); 231 if (IS_ERR(rq)) { 232 error = -ENOMEM; 233 goto out_free_buf; 234 } 235 req = scsi_req(rq); 236 237 error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); 238 if (error) 239 goto out_put_request; 240 241 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); 247 248 blk_execute_rq(rq->q, NULL, rq, 1); 249 if (req->result) { 250 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", 251 req->result); 252 error = -EIO; 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 } 301 302 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 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, 366 struct svc_rqst *rqstp, 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, 382 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 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 */ 419