1 /* 2 * Copyright (c) 2014-2016 Christoph Hellwig. 3 */ 4 #include <linux/exportfs.h> 5 #include <linux/iomap.h> 6 #include <linux/genhd.h> 7 #include <linux/slab.h> 8 #include <linux/pr.h> 9 10 #include <linux/nfsd/debug.h> 11 #include <scsi/scsi_proto.h> 12 #include <scsi/scsi_common.h> 13 #include <scsi/scsi_request.h> 14 15 #include "blocklayoutxdr.h" 16 #include "pnfs.h" 17 18 #define NFSDDBG_FACILITY NFSDDBG_PNFS 19 20 21 static __be32 22 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, 23 struct nfsd4_layoutget *args) 24 { 25 struct nfsd4_layout_seg *seg = &args->lg_seg; 26 struct super_block *sb = inode->i_sb; 27 u32 block_size = i_blocksize(inode); 28 struct pnfs_block_extent *bex; 29 struct iomap iomap; 30 u32 device_generation = 0; 31 int error; 32 33 if (seg->offset & (block_size - 1)) { 34 dprintk("pnfsd: I/O misaligned\n"); 35 goto out_layoutunavailable; 36 } 37 38 /* 39 * Some clients barf on non-zero block numbers for NONE or INVALID 40 * layouts, so make sure to zero the whole structure. 41 */ 42 error = -ENOMEM; 43 bex = kzalloc(sizeof(*bex), GFP_KERNEL); 44 if (!bex) 45 goto out_error; 46 args->lg_content = bex; 47 48 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, 49 &iomap, seg->iomode != IOMODE_READ, 50 &device_generation); 51 if (error) { 52 if (error == -ENXIO) 53 goto out_layoutunavailable; 54 goto out_error; 55 } 56 57 if (iomap.length < args->lg_minlength) { 58 dprintk("pnfsd: extent smaller than minlength\n"); 59 goto out_layoutunavailable; 60 } 61 62 switch (iomap.type) { 63 case IOMAP_MAPPED: 64 if (seg->iomode == IOMODE_READ) 65 bex->es = PNFS_BLOCK_READ_DATA; 66 else 67 bex->es = PNFS_BLOCK_READWRITE_DATA; 68 bex->soff = (iomap.blkno << 9); 69 break; 70 case IOMAP_UNWRITTEN: 71 if (seg->iomode & IOMODE_RW) { 72 /* 73 * Crack monkey special case from section 2.3.1. 74 */ 75 if (args->lg_minlength == 0) { 76 dprintk("pnfsd: no soup for you!\n"); 77 goto out_layoutunavailable; 78 } 79 80 bex->es = PNFS_BLOCK_INVALID_DATA; 81 bex->soff = (iomap.blkno << 9); 82 break; 83 } 84 /*FALLTHRU*/ 85 case IOMAP_HOLE: 86 if (seg->iomode == IOMODE_READ) { 87 bex->es = PNFS_BLOCK_NONE_DATA; 88 break; 89 } 90 /*FALLTHRU*/ 91 case IOMAP_DELALLOC: 92 default: 93 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); 94 goto out_layoutunavailable; 95 } 96 97 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); 98 if (error) 99 goto out_error; 100 bex->foff = iomap.offset; 101 bex->len = iomap.length; 102 103 seg->offset = iomap.offset; 104 seg->length = iomap.length; 105 106 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); 107 return 0; 108 109 out_error: 110 seg->length = 0; 111 return nfserrno(error); 112 out_layoutunavailable: 113 seg->length = 0; 114 return nfserr_layoutunavailable; 115 } 116 117 static __be32 118 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, 119 struct iomap *iomaps, int nr_iomaps) 120 { 121 loff_t new_size = lcp->lc_last_wr + 1; 122 struct iattr iattr = { .ia_valid = 0 }; 123 int error; 124 125 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 126 timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) 127 lcp->lc_mtime = current_time(inode); 128 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; 129 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; 130 131 if (new_size > i_size_read(inode)) { 132 iattr.ia_valid |= ATTR_SIZE; 133 iattr.ia_size = new_size; 134 } 135 136 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, 137 nr_iomaps, &iattr); 138 kfree(iomaps); 139 return nfserrno(error); 140 } 141 142 #ifdef CONFIG_NFSD_BLOCKLAYOUT 143 static int 144 nfsd4_block_get_device_info_simple(struct super_block *sb, 145 struct nfsd4_getdeviceinfo *gdp) 146 { 147 struct pnfs_block_deviceaddr *dev; 148 struct pnfs_block_volume *b; 149 150 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 151 sizeof(struct pnfs_block_volume), GFP_KERNEL); 152 if (!dev) 153 return -ENOMEM; 154 gdp->gd_device = dev; 155 156 dev->nr_volumes = 1; 157 b = &dev->volumes[0]; 158 159 b->type = PNFS_BLOCK_VOLUME_SIMPLE; 160 b->simple.sig_len = PNFS_BLOCK_UUID_LEN; 161 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, 162 &b->simple.offset); 163 } 164 165 static __be32 166 nfsd4_block_proc_getdeviceinfo(struct super_block *sb, 167 struct svc_rqst *rqstp, 168 struct nfs4_client *clp, 169 struct nfsd4_getdeviceinfo *gdp) 170 { 171 if (sb->s_bdev != sb->s_bdev->bd_contains) 172 return nfserr_inval; 173 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); 174 } 175 176 static __be32 177 nfsd4_block_proc_layoutcommit(struct inode *inode, 178 struct nfsd4_layoutcommit *lcp) 179 { 180 struct iomap *iomaps; 181 int nr_iomaps; 182 183 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, 184 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 185 if (nr_iomaps < 0) 186 return nfserrno(nr_iomaps); 187 188 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 189 } 190 191 const struct nfsd4_layout_ops bl_layout_ops = { 192 /* 193 * Pretend that we send notification to the client. This is a blatant 194 * lie to force recent Linux clients to cache our device IDs. 195 * We rarely ever change the device ID, so the harm of leaking deviceids 196 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 197 * in this regard, but I filed errata 4119 for this a while ago, and 198 * hopefully the Linux client will eventually start caching deviceids 199 * without this again. 200 */ 201 .notify_types = 202 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 203 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, 204 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 205 .proc_layoutget = nfsd4_block_proc_layoutget, 206 .encode_layoutget = nfsd4_block_encode_layoutget, 207 .proc_layoutcommit = nfsd4_block_proc_layoutcommit, 208 }; 209 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 210 211 #ifdef CONFIG_NFSD_SCSILAYOUT 212 static int nfsd4_scsi_identify_device(struct block_device *bdev, 213 struct pnfs_block_volume *b) 214 { 215 struct request_queue *q = bdev->bd_disk->queue; 216 struct request *rq; 217 struct scsi_request *req; 218 size_t bufflen = 252, len, id_len; 219 u8 *buf, *d, type, assoc; 220 int error; 221 222 buf = kzalloc(bufflen, GFP_KERNEL); 223 if (!buf) 224 return -ENOMEM; 225 226 rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL); 227 if (IS_ERR(rq)) { 228 error = -ENOMEM; 229 goto out_free_buf; 230 } 231 req = scsi_req(rq); 232 scsi_req_init(rq); 233 234 error = blk_rq_map_kern(q, rq, buf, bufflen, GFP_KERNEL); 235 if (error) 236 goto out_put_request; 237 238 req->cmd[0] = INQUIRY; 239 req->cmd[1] = 1; 240 req->cmd[2] = 0x83; 241 req->cmd[3] = bufflen >> 8; 242 req->cmd[4] = bufflen & 0xff; 243 req->cmd_len = COMMAND_SIZE(INQUIRY); 244 245 error = blk_execute_rq(rq->q, NULL, rq, 1); 246 if (error) { 247 pr_err("pNFS: INQUIRY 0x83 failed with: %x\n", 248 rq->errors); 249 goto out_put_request; 250 } 251 252 len = (buf[2] << 8) + buf[3] + 4; 253 if (len > bufflen) { 254 pr_err("pNFS: INQUIRY 0x83 response invalid (len = %zd)\n", 255 len); 256 goto out_put_request; 257 } 258 259 d = buf + 4; 260 for (d = buf + 4; d < buf + len; d += id_len + 4) { 261 id_len = d[3]; 262 type = d[1] & 0xf; 263 assoc = (d[1] >> 4) & 0x3; 264 265 /* 266 * We only care about a EUI-64 and NAA designator types 267 * with LU association. 268 */ 269 if (assoc != 0x00) 270 continue; 271 if (type != 0x02 && type != 0x03) 272 continue; 273 if (id_len != 8 && id_len != 12 && id_len != 16) 274 continue; 275 276 b->scsi.code_set = PS_CODE_SET_BINARY; 277 b->scsi.designator_type = type == 0x02 ? 278 PS_DESIGNATOR_EUI64 : PS_DESIGNATOR_NAA; 279 b->scsi.designator_len = id_len; 280 memcpy(b->scsi.designator, d + 4, id_len); 281 282 /* 283 * If we found a 8 or 12 byte descriptor continue on to 284 * see if a 16 byte one is available. If we find a 285 * 16 byte descriptor we're done. 286 */ 287 if (id_len == 16) 288 break; 289 } 290 291 out_put_request: 292 blk_put_request(rq); 293 out_free_buf: 294 kfree(buf); 295 return error; 296 } 297 298 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 299 300 /* 301 * We use the client ID as a unique key for the reservations. 302 * This allows us to easily fence a client when recalls fail. 303 */ 304 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) 305 { 306 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; 307 } 308 309 static int 310 nfsd4_block_get_device_info_scsi(struct super_block *sb, 311 struct nfs4_client *clp, 312 struct nfsd4_getdeviceinfo *gdp) 313 { 314 struct pnfs_block_deviceaddr *dev; 315 struct pnfs_block_volume *b; 316 const struct pr_ops *ops; 317 int error; 318 319 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 320 sizeof(struct pnfs_block_volume), GFP_KERNEL); 321 if (!dev) 322 return -ENOMEM; 323 gdp->gd_device = dev; 324 325 dev->nr_volumes = 1; 326 b = &dev->volumes[0]; 327 328 b->type = PNFS_BLOCK_VOLUME_SCSI; 329 b->scsi.pr_key = nfsd4_scsi_pr_key(clp); 330 331 error = nfsd4_scsi_identify_device(sb->s_bdev, b); 332 if (error) 333 return error; 334 335 ops = sb->s_bdev->bd_disk->fops->pr_ops; 336 if (!ops) { 337 pr_err("pNFS: device %s does not support PRs.\n", 338 sb->s_id); 339 return -EINVAL; 340 } 341 342 error = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); 343 if (error) { 344 pr_err("pNFS: failed to register key for device %s.\n", 345 sb->s_id); 346 return -EINVAL; 347 } 348 349 error = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, 350 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); 351 if (error) { 352 pr_err("pNFS: failed to reserve device %s.\n", 353 sb->s_id); 354 return -EINVAL; 355 } 356 357 return 0; 358 } 359 360 static __be32 361 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, 362 struct svc_rqst *rqstp, 363 struct nfs4_client *clp, 364 struct nfsd4_getdeviceinfo *gdp) 365 { 366 if (sb->s_bdev != sb->s_bdev->bd_contains) 367 return nfserr_inval; 368 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); 369 } 370 static __be32 371 nfsd4_scsi_proc_layoutcommit(struct inode *inode, 372 struct nfsd4_layoutcommit *lcp) 373 { 374 struct iomap *iomaps; 375 int nr_iomaps; 376 377 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, 378 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 379 if (nr_iomaps < 0) 380 return nfserrno(nr_iomaps); 381 382 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 383 } 384 385 static void 386 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) 387 { 388 struct nfs4_client *clp = ls->ls_stid.sc_client; 389 struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev; 390 391 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, 392 nfsd4_scsi_pr_key(clp), 0, true); 393 } 394 395 const struct nfsd4_layout_ops scsi_layout_ops = { 396 /* 397 * Pretend that we send notification to the client. This is a blatant 398 * lie to force recent Linux clients to cache our device IDs. 399 * We rarely ever change the device ID, so the harm of leaking deviceids 400 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 401 * in this regard, but I filed errata 4119 for this a while ago, and 402 * hopefully the Linux client will eventually start caching deviceids 403 * without this again. 404 */ 405 .notify_types = 406 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 407 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, 408 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 409 .proc_layoutget = nfsd4_block_proc_layoutget, 410 .encode_layoutget = nfsd4_block_encode_layoutget, 411 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, 412 .fence_client = nfsd4_scsi_fence_client, 413 }; 414 #endif /* CONFIG_NFSD_SCSILAYOUT */ 415