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 14 #include "blocklayoutxdr.h" 15 #include "pnfs.h" 16 17 #define NFSDDBG_FACILITY NFSDDBG_PNFS 18 19 20 static __be32 21 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, 22 struct nfsd4_layoutget *args) 23 { 24 struct nfsd4_layout_seg *seg = &args->lg_seg; 25 struct super_block *sb = inode->i_sb; 26 u32 block_size = (1 << inode->i_blkbits); 27 struct pnfs_block_extent *bex; 28 struct iomap iomap; 29 u32 device_generation = 0; 30 int error; 31 32 if (seg->offset & (block_size - 1)) { 33 dprintk("pnfsd: I/O misaligned\n"); 34 goto out_layoutunavailable; 35 } 36 37 /* 38 * Some clients barf on non-zero block numbers for NONE or INVALID 39 * layouts, so make sure to zero the whole structure. 40 */ 41 error = -ENOMEM; 42 bex = kzalloc(sizeof(*bex), GFP_KERNEL); 43 if (!bex) 44 goto out_error; 45 args->lg_content = bex; 46 47 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, 48 &iomap, seg->iomode != IOMODE_READ, 49 &device_generation); 50 if (error) { 51 if (error == -ENXIO) 52 goto out_layoutunavailable; 53 goto out_error; 54 } 55 56 if (iomap.length < args->lg_minlength) { 57 dprintk("pnfsd: extent smaller than minlength\n"); 58 goto out_layoutunavailable; 59 } 60 61 switch (iomap.type) { 62 case IOMAP_MAPPED: 63 if (seg->iomode == IOMODE_READ) 64 bex->es = PNFS_BLOCK_READ_DATA; 65 else 66 bex->es = PNFS_BLOCK_READWRITE_DATA; 67 bex->soff = (iomap.blkno << 9); 68 break; 69 case IOMAP_UNWRITTEN: 70 if (seg->iomode & IOMODE_RW) { 71 /* 72 * Crack monkey special case from section 2.3.1. 73 */ 74 if (args->lg_minlength == 0) { 75 dprintk("pnfsd: no soup for you!\n"); 76 goto out_layoutunavailable; 77 } 78 79 bex->es = PNFS_BLOCK_INVALID_DATA; 80 bex->soff = (iomap.blkno << 9); 81 break; 82 } 83 /*FALLTHRU*/ 84 case IOMAP_HOLE: 85 if (seg->iomode == IOMODE_READ) { 86 bex->es = PNFS_BLOCK_NONE_DATA; 87 break; 88 } 89 /*FALLTHRU*/ 90 case IOMAP_DELALLOC: 91 default: 92 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); 93 goto out_layoutunavailable; 94 } 95 96 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); 97 if (error) 98 goto out_error; 99 bex->foff = iomap.offset; 100 bex->len = iomap.length; 101 102 seg->offset = iomap.offset; 103 seg->length = iomap.length; 104 105 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); 106 return 0; 107 108 out_error: 109 seg->length = 0; 110 return nfserrno(error); 111 out_layoutunavailable: 112 seg->length = 0; 113 return nfserr_layoutunavailable; 114 } 115 116 static __be32 117 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, 118 struct iomap *iomaps, int nr_iomaps) 119 { 120 loff_t new_size = lcp->lc_last_wr + 1; 121 struct iattr iattr = { .ia_valid = 0 }; 122 int error; 123 124 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 125 timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) 126 lcp->lc_mtime = current_fs_time(inode->i_sb); 127 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; 128 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; 129 130 if (new_size > i_size_read(inode)) { 131 iattr.ia_valid |= ATTR_SIZE; 132 iattr.ia_size = new_size; 133 } 134 135 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, 136 nr_iomaps, &iattr); 137 kfree(iomaps); 138 return nfserrno(error); 139 } 140 141 #ifdef CONFIG_NFSD_BLOCKLAYOUT 142 static int 143 nfsd4_block_get_device_info_simple(struct super_block *sb, 144 struct nfsd4_getdeviceinfo *gdp) 145 { 146 struct pnfs_block_deviceaddr *dev; 147 struct pnfs_block_volume *b; 148 149 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 150 sizeof(struct pnfs_block_volume), GFP_KERNEL); 151 if (!dev) 152 return -ENOMEM; 153 gdp->gd_device = dev; 154 155 dev->nr_volumes = 1; 156 b = &dev->volumes[0]; 157 158 b->type = PNFS_BLOCK_VOLUME_SIMPLE; 159 b->simple.sig_len = PNFS_BLOCK_UUID_LEN; 160 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, 161 &b->simple.offset); 162 } 163 164 static __be32 165 nfsd4_block_proc_getdeviceinfo(struct super_block *sb, 166 struct nfs4_client *clp, 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 } 188 189 const struct nfsd4_layout_ops bl_layout_ops = { 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, 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 }; 207 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 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 } 293 294 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 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, 358 struct nfs4_client *clp, 359 struct nfsd4_getdeviceinfo *gdp) 360 { 361 if (sb->s_bdev != sb->s_bdev->bd_contains) 362 return nfserr_inval; 363 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); 364 } 365 static __be32 366 nfsd4_scsi_proc_layoutcommit(struct inode *inode, 367 struct nfsd4_layoutcommit *lcp) 368 { 369 struct iomap *iomaps; 370 int nr_iomaps; 371 372 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, 373 lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits); 374 if (nr_iomaps < 0) 375 return nfserrno(nr_iomaps); 376 377 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 378 } 379 380 static void 381 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) 382 { 383 struct nfs4_client *clp = ls->ls_stid.sc_client; 384 struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev; 385 386 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, 387 nfsd4_scsi_pr_key(clp), 0, true); 388 } 389 390 const struct nfsd4_layout_ops scsi_layout_ops = { 391 /* 392 * Pretend that we send notification to the client. This is a blatant 393 * lie to force recent Linux clients to cache our device IDs. 394 * We rarely ever change the device ID, so the harm of leaking deviceids 395 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 396 * in this regard, but I filed errata 4119 for this a while ago, and 397 * hopefully the Linux client will eventually start caching deviceids 398 * without this again. 399 */ 400 .notify_types = 401 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 402 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, 403 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 404 .proc_layoutget = nfsd4_block_proc_layoutget, 405 .encode_layoutget = nfsd4_block_encode_layoutget, 406 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, 407 .fence_client = nfsd4_scsi_fence_client, 408 }; 409 #endif /* CONFIG_NFSD_SCSILAYOUT */ 410