Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Device operations for the pnfs nfs4 file layout driver. |
| 3 | * |
| 4 | * Copyright (c) 2002 |
| 5 | * The Regents of the University of Michigan |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * Dean Hildebrand <dhildebz@umich.edu> |
| 9 | * Garth Goodson <Garth.Goodson@netapp.com> |
| 10 | * |
| 11 | * Permission is granted to use, copy, create derivative works, and |
| 12 | * redistribute this software and such derivative works for any purpose, |
| 13 | * so long as the name of the University of Michigan is not used in |
| 14 | * any advertising or publicity pertaining to the use or distribution |
| 15 | * of this software without specific, written prior authorization. If |
| 16 | * the above copyright notice or any other identification of the |
| 17 | * University of Michigan is included in any copy of any portion of |
| 18 | * this software, then the disclaimer below must also be included. |
| 19 | * |
| 20 | * This software is provided as is, without representation or warranty |
| 21 | * of any kind either express or implied, including without limitation |
| 22 | * the implied warranties of merchantability, fitness for a particular |
| 23 | * purpose, or noninfringement. The Regents of the University of |
| 24 | * Michigan shall not be liable for any damages, including special, |
| 25 | * indirect, incidental, or consequential damages, with respect to any |
| 26 | * claim arising out of or in connection with the use of the software, |
| 27 | * even if it has been or is hereafter advised of the possibility of |
| 28 | * such damages. |
| 29 | */ |
| 30 | |
| 31 | #include <linux/nfs_fs.h> |
| 32 | #include <linux/vmalloc.h> |
| 33 | |
| 34 | #include "internal.h" |
| 35 | #include "nfs4filelayout.h" |
| 36 | |
| 37 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
| 38 | |
| 39 | /* |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 40 | * Device ID RCU cache. A device ID is unique per client ID and layout type. |
| 41 | */ |
| 42 | #define NFS4_FL_DEVICE_ID_HASH_BITS 5 |
| 43 | #define NFS4_FL_DEVICE_ID_HASH_SIZE (1 << NFS4_FL_DEVICE_ID_HASH_BITS) |
| 44 | #define NFS4_FL_DEVICE_ID_HASH_MASK (NFS4_FL_DEVICE_ID_HASH_SIZE - 1) |
| 45 | |
| 46 | static inline u32 |
| 47 | nfs4_fl_deviceid_hash(struct nfs4_deviceid *id) |
| 48 | { |
| 49 | unsigned char *cptr = (unsigned char *)id->data; |
| 50 | unsigned int nbytes = NFS4_DEVICEID4_SIZE; |
| 51 | u32 x = 0; |
| 52 | |
| 53 | while (nbytes--) { |
| 54 | x *= 37; |
| 55 | x += *cptr++; |
| 56 | } |
| 57 | return x & NFS4_FL_DEVICE_ID_HASH_MASK; |
| 58 | } |
| 59 | |
| 60 | static struct hlist_head filelayout_deviceid_cache[NFS4_FL_DEVICE_ID_HASH_SIZE]; |
| 61 | static DEFINE_SPINLOCK(filelayout_deviceid_lock); |
| 62 | |
| 63 | /* |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 64 | * Data server cache |
| 65 | * |
| 66 | * Data servers can be mapped to different device ids. |
| 67 | * nfs4_pnfs_ds reference counting |
| 68 | * - set to 1 on allocation |
| 69 | * - incremented when a device id maps a data server already in the cache. |
| 70 | * - decremented when deviceid is removed from the cache. |
| 71 | */ |
| 72 | DEFINE_SPINLOCK(nfs4_ds_cache_lock); |
| 73 | static LIST_HEAD(nfs4_data_server_cache); |
| 74 | |
| 75 | /* Debug routines */ |
| 76 | void |
| 77 | print_ds(struct nfs4_pnfs_ds *ds) |
| 78 | { |
| 79 | if (ds == NULL) { |
| 80 | printk("%s NULL device\n", __func__); |
| 81 | return; |
| 82 | } |
| 83 | printk(" ip_addr %x port %hu\n" |
| 84 | " ref count %d\n" |
| 85 | " client %p\n" |
| 86 | " cl_exchange_flags %x\n", |
| 87 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port), |
| 88 | atomic_read(&ds->ds_count), ds->ds_clp, |
| 89 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); |
| 90 | } |
| 91 | |
| 92 | void |
| 93 | print_ds_list(struct nfs4_file_layout_dsaddr *dsaddr) |
| 94 | { |
| 95 | int i; |
| 96 | |
| 97 | ifdebug(FACILITY) { |
| 98 | printk("%s dsaddr->ds_num %d\n", __func__, |
| 99 | dsaddr->ds_num); |
| 100 | for (i = 0; i < dsaddr->ds_num; i++) |
| 101 | print_ds(dsaddr->ds_list[i]); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | void print_deviceid(struct nfs4_deviceid *id) |
| 106 | { |
| 107 | u32 *p = (u32 *)id; |
| 108 | |
| 109 | dprintk("%s: device id= [%x%x%x%x]\n", __func__, |
| 110 | p[0], p[1], p[2], p[3]); |
| 111 | } |
| 112 | |
| 113 | /* nfs4_ds_cache_lock is held */ |
| 114 | static struct nfs4_pnfs_ds * |
| 115 | _data_server_lookup_locked(u32 ip_addr, u32 port) |
| 116 | { |
| 117 | struct nfs4_pnfs_ds *ds; |
| 118 | |
| 119 | dprintk("_data_server_lookup: ip_addr=%x port=%hu\n", |
| 120 | ntohl(ip_addr), ntohs(port)); |
| 121 | |
| 122 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) { |
| 123 | if (ds->ds_ip_addr == ip_addr && |
| 124 | ds->ds_port == port) { |
| 125 | return ds; |
| 126 | } |
| 127 | } |
| 128 | return NULL; |
| 129 | } |
| 130 | |
Andy Adamson | d83217c | 2011-03-01 01:34:17 +0000 | [diff] [blame] | 131 | /* |
| 132 | * Create an rpc connection to the nfs4_pnfs_ds data server |
| 133 | * Currently only support IPv4 |
| 134 | */ |
| 135 | static int |
| 136 | nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds) |
| 137 | { |
| 138 | struct nfs_client *clp; |
| 139 | struct sockaddr_in sin; |
| 140 | int status = 0; |
| 141 | |
| 142 | dprintk("--> %s ip:port %x:%hu au_flavor %d\n", __func__, |
| 143 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port), |
| 144 | mds_srv->nfs_client->cl_rpcclient->cl_auth->au_flavor); |
| 145 | |
| 146 | sin.sin_family = AF_INET; |
| 147 | sin.sin_addr.s_addr = ds->ds_ip_addr; |
| 148 | sin.sin_port = ds->ds_port; |
| 149 | |
| 150 | clp = nfs4_set_ds_client(mds_srv->nfs_client, (struct sockaddr *)&sin, |
| 151 | sizeof(sin), IPPROTO_TCP); |
| 152 | if (IS_ERR(clp)) { |
| 153 | status = PTR_ERR(clp); |
| 154 | goto out; |
| 155 | } |
| 156 | |
| 157 | if ((clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) != 0) { |
| 158 | if (!is_ds_client(clp)) { |
| 159 | status = -ENODEV; |
| 160 | goto out_put; |
| 161 | } |
| 162 | ds->ds_clp = clp; |
| 163 | dprintk("%s [existing] ip=%x, port=%hu\n", __func__, |
| 164 | ntohl(ds->ds_ip_addr), ntohs(ds->ds_port)); |
| 165 | goto out; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Do not set NFS_CS_CHECK_LEASE_TIME instead set the DS lease to |
| 170 | * be equal to the MDS lease. Renewal is scheduled in create_session. |
| 171 | */ |
| 172 | spin_lock(&mds_srv->nfs_client->cl_lock); |
| 173 | clp->cl_lease_time = mds_srv->nfs_client->cl_lease_time; |
| 174 | spin_unlock(&mds_srv->nfs_client->cl_lock); |
| 175 | clp->cl_last_renewal = jiffies; |
| 176 | |
| 177 | /* New nfs_client */ |
| 178 | status = nfs4_init_ds_session(clp); |
| 179 | if (status) |
| 180 | goto out_put; |
| 181 | |
| 182 | ds->ds_clp = clp; |
| 183 | dprintk("%s [new] ip=%x, port=%hu\n", __func__, ntohl(ds->ds_ip_addr), |
| 184 | ntohs(ds->ds_port)); |
| 185 | out: |
| 186 | return status; |
| 187 | out_put: |
| 188 | nfs_put_client(clp); |
| 189 | goto out; |
| 190 | } |
| 191 | |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 192 | static void |
| 193 | destroy_ds(struct nfs4_pnfs_ds *ds) |
| 194 | { |
| 195 | dprintk("--> %s\n", __func__); |
| 196 | ifdebug(FACILITY) |
| 197 | print_ds(ds); |
| 198 | |
| 199 | if (ds->ds_clp) |
| 200 | nfs_put_client(ds->ds_clp); |
| 201 | kfree(ds); |
| 202 | } |
| 203 | |
| 204 | static void |
| 205 | nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) |
| 206 | { |
| 207 | struct nfs4_pnfs_ds *ds; |
| 208 | int i; |
| 209 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 210 | print_deviceid(&dsaddr->deviceid); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 211 | |
| 212 | for (i = 0; i < dsaddr->ds_num; i++) { |
| 213 | ds = dsaddr->ds_list[i]; |
| 214 | if (ds != NULL) { |
| 215 | if (atomic_dec_and_lock(&ds->ds_count, |
| 216 | &nfs4_ds_cache_lock)) { |
| 217 | list_del_init(&ds->ds_node); |
| 218 | spin_unlock(&nfs4_ds_cache_lock); |
| 219 | destroy_ds(ds); |
| 220 | } |
| 221 | } |
| 222 | } |
| 223 | kfree(dsaddr->stripe_indices); |
| 224 | kfree(dsaddr); |
| 225 | } |
| 226 | |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 227 | static struct nfs4_pnfs_ds * |
| 228 | nfs4_pnfs_ds_add(struct inode *inode, u32 ip_addr, u32 port) |
| 229 | { |
| 230 | struct nfs4_pnfs_ds *tmp_ds, *ds; |
| 231 | |
| 232 | ds = kzalloc(sizeof(*tmp_ds), GFP_KERNEL); |
| 233 | if (!ds) |
| 234 | goto out; |
| 235 | |
| 236 | spin_lock(&nfs4_ds_cache_lock); |
| 237 | tmp_ds = _data_server_lookup_locked(ip_addr, port); |
| 238 | if (tmp_ds == NULL) { |
| 239 | ds->ds_ip_addr = ip_addr; |
| 240 | ds->ds_port = port; |
| 241 | atomic_set(&ds->ds_count, 1); |
| 242 | INIT_LIST_HEAD(&ds->ds_node); |
| 243 | ds->ds_clp = NULL; |
| 244 | list_add(&ds->ds_node, &nfs4_data_server_cache); |
| 245 | dprintk("%s add new data server ip 0x%x\n", __func__, |
| 246 | ds->ds_ip_addr); |
| 247 | } else { |
| 248 | kfree(ds); |
| 249 | atomic_inc(&tmp_ds->ds_count); |
| 250 | dprintk("%s data server found ip 0x%x, inc'ed ds_count to %d\n", |
| 251 | __func__, tmp_ds->ds_ip_addr, |
| 252 | atomic_read(&tmp_ds->ds_count)); |
| 253 | ds = tmp_ds; |
| 254 | } |
| 255 | spin_unlock(&nfs4_ds_cache_lock); |
| 256 | out: |
| 257 | return ds; |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Currently only support ipv4, and one multi-path address. |
| 262 | */ |
| 263 | static struct nfs4_pnfs_ds * |
| 264 | decode_and_add_ds(__be32 **pp, struct inode *inode) |
| 265 | { |
| 266 | struct nfs4_pnfs_ds *ds = NULL; |
| 267 | char *buf; |
| 268 | const char *ipend, *pstr; |
| 269 | u32 ip_addr, port; |
| 270 | int nlen, rlen, i; |
| 271 | int tmp[2]; |
| 272 | __be32 *r_netid, *r_addr, *p = *pp; |
| 273 | |
| 274 | /* r_netid */ |
| 275 | nlen = be32_to_cpup(p++); |
| 276 | r_netid = p; |
| 277 | p += XDR_QUADLEN(nlen); |
| 278 | |
| 279 | /* r_addr */ |
| 280 | rlen = be32_to_cpup(p++); |
| 281 | r_addr = p; |
| 282 | p += XDR_QUADLEN(rlen); |
| 283 | *pp = p; |
| 284 | |
| 285 | /* Check that netid is "tcp" */ |
| 286 | if (nlen != 3 || memcmp((char *)r_netid, "tcp", 3)) { |
| 287 | dprintk("%s: ERROR: non ipv4 TCP r_netid\n", __func__); |
| 288 | goto out_err; |
| 289 | } |
| 290 | |
| 291 | /* ipv6 length plus port is legal */ |
| 292 | if (rlen > INET6_ADDRSTRLEN + 8) { |
Jesper Juhl | ad3d2ee | 2011-01-17 18:41:50 +0000 | [diff] [blame] | 293 | dprintk("%s: Invalid address, length %d\n", __func__, |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 294 | rlen); |
| 295 | goto out_err; |
| 296 | } |
| 297 | buf = kmalloc(rlen + 1, GFP_KERNEL); |
Stanislav Fomichev | b9f8105 | 2011-02-05 23:13:01 +0000 | [diff] [blame] | 298 | if (!buf) { |
| 299 | dprintk("%s: Not enough memory\n", __func__); |
| 300 | goto out_err; |
| 301 | } |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 302 | buf[rlen] = '\0'; |
| 303 | memcpy(buf, r_addr, rlen); |
| 304 | |
| 305 | /* replace the port dots with dashes for the in4_pton() delimiter*/ |
| 306 | for (i = 0; i < 2; i++) { |
| 307 | char *res = strrchr(buf, '.'); |
Jesper Juhl | ad3d2ee | 2011-01-17 18:41:50 +0000 | [diff] [blame] | 308 | if (!res) { |
| 309 | dprintk("%s: Failed finding expected dots in port\n", |
| 310 | __func__); |
| 311 | goto out_free; |
| 312 | } |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 313 | *res = '-'; |
| 314 | } |
| 315 | |
| 316 | /* Currently only support ipv4 address */ |
| 317 | if (in4_pton(buf, rlen, (u8 *)&ip_addr, '-', &ipend) == 0) { |
| 318 | dprintk("%s: Only ipv4 addresses supported\n", __func__); |
| 319 | goto out_free; |
| 320 | } |
| 321 | |
| 322 | /* port */ |
| 323 | pstr = ipend; |
| 324 | sscanf(pstr, "-%d-%d", &tmp[0], &tmp[1]); |
| 325 | port = htons((tmp[0] << 8) | (tmp[1])); |
| 326 | |
| 327 | ds = nfs4_pnfs_ds_add(inode, ip_addr, port); |
Jesper Juhl | ad3d2ee | 2011-01-17 18:41:50 +0000 | [diff] [blame] | 328 | dprintk("%s: Decoded address and port %s\n", __func__, buf); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 329 | out_free: |
| 330 | kfree(buf); |
| 331 | out_err: |
| 332 | return ds; |
| 333 | } |
| 334 | |
| 335 | /* Decode opaque device data and return the result */ |
| 336 | static struct nfs4_file_layout_dsaddr* |
| 337 | decode_device(struct inode *ino, struct pnfs_device *pdev) |
| 338 | { |
| 339 | int i, dummy; |
| 340 | u32 cnt, num; |
| 341 | u8 *indexp; |
| 342 | __be32 *p = (__be32 *)pdev->area, *indicesp; |
| 343 | struct nfs4_file_layout_dsaddr *dsaddr; |
| 344 | |
| 345 | /* Get the stripe count (number of stripe index) */ |
| 346 | cnt = be32_to_cpup(p++); |
| 347 | dprintk("%s stripe count %d\n", __func__, cnt); |
| 348 | if (cnt > NFS4_PNFS_MAX_STRIPE_CNT) { |
| 349 | printk(KERN_WARNING "%s: stripe count %d greater than " |
| 350 | "supported maximum %d\n", __func__, |
| 351 | cnt, NFS4_PNFS_MAX_STRIPE_CNT); |
| 352 | goto out_err; |
| 353 | } |
| 354 | |
| 355 | /* Check the multipath list count */ |
| 356 | indicesp = p; |
| 357 | p += XDR_QUADLEN(cnt << 2); |
| 358 | num = be32_to_cpup(p++); |
| 359 | dprintk("%s ds_num %u\n", __func__, num); |
| 360 | if (num > NFS4_PNFS_MAX_MULTI_CNT) { |
| 361 | printk(KERN_WARNING "%s: multipath count %d greater than " |
| 362 | "supported maximum %d\n", __func__, |
| 363 | num, NFS4_PNFS_MAX_MULTI_CNT); |
| 364 | goto out_err; |
| 365 | } |
| 366 | dsaddr = kzalloc(sizeof(*dsaddr) + |
| 367 | (sizeof(struct nfs4_pnfs_ds *) * (num - 1)), |
| 368 | GFP_KERNEL); |
| 369 | if (!dsaddr) |
| 370 | goto out_err; |
| 371 | |
| 372 | dsaddr->stripe_indices = kzalloc(sizeof(u8) * cnt, GFP_KERNEL); |
| 373 | if (!dsaddr->stripe_indices) |
| 374 | goto out_err_free; |
| 375 | |
| 376 | dsaddr->stripe_count = cnt; |
| 377 | dsaddr->ds_num = num; |
| 378 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 379 | memcpy(&dsaddr->deviceid, &pdev->dev_id, sizeof(pdev->dev_id)); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 380 | |
| 381 | /* Go back an read stripe indices */ |
| 382 | p = indicesp; |
| 383 | indexp = &dsaddr->stripe_indices[0]; |
| 384 | for (i = 0; i < dsaddr->stripe_count; i++) { |
| 385 | *indexp = be32_to_cpup(p++); |
| 386 | if (*indexp >= num) |
| 387 | goto out_err_free; |
| 388 | indexp++; |
| 389 | } |
| 390 | /* Skip already read multipath list count */ |
| 391 | p++; |
| 392 | |
| 393 | for (i = 0; i < dsaddr->ds_num; i++) { |
| 394 | int j; |
| 395 | |
| 396 | dummy = be32_to_cpup(p++); /* multipath count */ |
| 397 | if (dummy > 1) { |
| 398 | printk(KERN_WARNING |
| 399 | "%s: Multipath count %d not supported, " |
| 400 | "skipping all greater than 1\n", __func__, |
| 401 | dummy); |
| 402 | } |
| 403 | for (j = 0; j < dummy; j++) { |
| 404 | if (j == 0) { |
| 405 | dsaddr->ds_list[i] = decode_and_add_ds(&p, ino); |
| 406 | if (dsaddr->ds_list[i] == NULL) |
| 407 | goto out_err_free; |
| 408 | } else { |
| 409 | u32 len; |
| 410 | /* skip extra multipath */ |
| 411 | len = be32_to_cpup(p++); |
| 412 | p += XDR_QUADLEN(len); |
| 413 | len = be32_to_cpup(p++); |
| 414 | p += XDR_QUADLEN(len); |
| 415 | continue; |
| 416 | } |
| 417 | } |
| 418 | } |
| 419 | return dsaddr; |
| 420 | |
| 421 | out_err_free: |
| 422 | nfs4_fl_free_deviceid(dsaddr); |
| 423 | out_err: |
| 424 | dprintk("%s ERROR: returning NULL\n", __func__); |
| 425 | return NULL; |
| 426 | } |
| 427 | |
| 428 | /* |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 429 | * Decode the opaque device specified in 'dev' and add it to the cache of |
| 430 | * available devices. |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 431 | */ |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 432 | static struct nfs4_file_layout_dsaddr * |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 433 | decode_and_add_device(struct inode *inode, struct pnfs_device *dev) |
| 434 | { |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 435 | struct nfs4_file_layout_dsaddr *d, *new; |
| 436 | long hash; |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 437 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 438 | new = decode_device(inode, dev); |
| 439 | if (!new) { |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 440 | printk(KERN_WARNING "%s: Could not decode or add device\n", |
| 441 | __func__); |
| 442 | return NULL; |
| 443 | } |
| 444 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 445 | spin_lock(&filelayout_deviceid_lock); |
| 446 | d = nfs4_fl_find_get_deviceid(&new->deviceid); |
| 447 | if (d) { |
| 448 | spin_unlock(&filelayout_deviceid_lock); |
| 449 | nfs4_fl_free_deviceid(new); |
| 450 | return d; |
| 451 | } |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 452 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 453 | INIT_HLIST_NODE(&new->node); |
| 454 | atomic_set(&new->ref, 1); |
| 455 | hash = nfs4_fl_deviceid_hash(&new->deviceid); |
| 456 | hlist_add_head_rcu(&new->node, &filelayout_deviceid_cache[hash]); |
| 457 | spin_unlock(&filelayout_deviceid_lock); |
| 458 | |
| 459 | return new; |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Retrieve the information for dev_id, add it to the list |
| 464 | * of available devices, and return it. |
| 465 | */ |
| 466 | struct nfs4_file_layout_dsaddr * |
| 467 | get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id) |
| 468 | { |
| 469 | struct pnfs_device *pdev = NULL; |
| 470 | u32 max_resp_sz; |
| 471 | int max_pages; |
| 472 | struct page **pages = NULL; |
| 473 | struct nfs4_file_layout_dsaddr *dsaddr = NULL; |
| 474 | int rc, i; |
| 475 | struct nfs_server *server = NFS_SERVER(inode); |
| 476 | |
| 477 | /* |
| 478 | * Use the session max response size as the basis for setting |
| 479 | * GETDEVICEINFO's maxcount |
| 480 | */ |
| 481 | max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; |
| 482 | max_pages = max_resp_sz >> PAGE_SHIFT; |
| 483 | dprintk("%s inode %p max_resp_sz %u max_pages %d\n", |
| 484 | __func__, inode, max_resp_sz, max_pages); |
| 485 | |
| 486 | pdev = kzalloc(sizeof(struct pnfs_device), GFP_KERNEL); |
| 487 | if (pdev == NULL) |
| 488 | return NULL; |
| 489 | |
| 490 | pages = kzalloc(max_pages * sizeof(struct page *), GFP_KERNEL); |
| 491 | if (pages == NULL) { |
| 492 | kfree(pdev); |
| 493 | return NULL; |
| 494 | } |
| 495 | for (i = 0; i < max_pages; i++) { |
| 496 | pages[i] = alloc_page(GFP_KERNEL); |
| 497 | if (!pages[i]) |
| 498 | goto out_free; |
| 499 | } |
| 500 | |
| 501 | /* set pdev->area */ |
| 502 | pdev->area = vmap(pages, max_pages, VM_MAP, PAGE_KERNEL); |
| 503 | if (!pdev->area) |
| 504 | goto out_free; |
| 505 | |
| 506 | memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id)); |
| 507 | pdev->layout_type = LAYOUT_NFSV4_1_FILES; |
| 508 | pdev->pages = pages; |
| 509 | pdev->pgbase = 0; |
| 510 | pdev->pglen = PAGE_SIZE * max_pages; |
| 511 | pdev->mincount = 0; |
| 512 | |
| 513 | rc = nfs4_proc_getdeviceinfo(server, pdev); |
| 514 | dprintk("%s getdevice info returns %d\n", __func__, rc); |
| 515 | if (rc) |
| 516 | goto out_free; |
| 517 | |
| 518 | /* |
| 519 | * Found new device, need to decode it and then add it to the |
| 520 | * list of known devices for this mountpoint. |
| 521 | */ |
| 522 | dsaddr = decode_and_add_device(inode, pdev); |
| 523 | out_free: |
| 524 | if (pdev->area != NULL) |
| 525 | vunmap(pdev->area); |
| 526 | for (i = 0; i < max_pages; i++) |
| 527 | __free_page(pages[i]); |
| 528 | kfree(pages); |
| 529 | kfree(pdev); |
| 530 | dprintk("<-- %s dsaddr %p\n", __func__, dsaddr); |
| 531 | return dsaddr; |
| 532 | } |
| 533 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 534 | void |
| 535 | nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr) |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 536 | { |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 537 | if (atomic_dec_and_lock(&dsaddr->ref, &filelayout_deviceid_lock)) { |
| 538 | hlist_del_rcu(&dsaddr->node); |
| 539 | spin_unlock(&filelayout_deviceid_lock); |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 540 | |
Christoph Hellwig | ea8eecd | 2011-03-01 01:34:21 +0000 | [diff] [blame] | 541 | synchronize_rcu(); |
| 542 | nfs4_fl_free_deviceid(dsaddr); |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | struct nfs4_file_layout_dsaddr * |
| 547 | nfs4_fl_find_get_deviceid(struct nfs4_deviceid *id) |
| 548 | { |
| 549 | struct nfs4_file_layout_dsaddr *d; |
| 550 | struct hlist_node *n; |
| 551 | long hash = nfs4_fl_deviceid_hash(id); |
| 552 | |
| 553 | |
| 554 | rcu_read_lock(); |
| 555 | hlist_for_each_entry_rcu(d, n, &filelayout_deviceid_cache[hash], node) { |
| 556 | if (!memcmp(&d->deviceid, id, sizeof(*id))) { |
| 557 | if (!atomic_inc_not_zero(&d->ref)) |
| 558 | goto fail; |
| 559 | rcu_read_unlock(); |
| 560 | return d; |
| 561 | } |
| 562 | } |
| 563 | fail: |
| 564 | rcu_read_unlock(); |
| 565 | return NULL; |
Andy Adamson | 16b374c | 2010-10-20 00:18:04 -0400 | [diff] [blame] | 566 | } |
Fred Isaman | cfe7f41 | 2011-03-01 01:34:18 +0000 | [diff] [blame] | 567 | |
| 568 | /* |
| 569 | * Want res = (offset - layout->pattern_offset)/ layout->stripe_unit |
| 570 | * Then: ((res + fsi) % dsaddr->stripe_count) |
| 571 | */ |
| 572 | u32 |
| 573 | nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset) |
| 574 | { |
| 575 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| 576 | u64 tmp; |
| 577 | |
| 578 | tmp = offset - flseg->pattern_offset; |
| 579 | do_div(tmp, flseg->stripe_unit); |
| 580 | tmp += flseg->first_stripe_index; |
| 581 | return do_div(tmp, flseg->dsaddr->stripe_count); |
| 582 | } |
| 583 | |
| 584 | u32 |
| 585 | nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j) |
| 586 | { |
| 587 | return FILELAYOUT_LSEG(lseg)->dsaddr->stripe_indices[j]; |
| 588 | } |
| 589 | |
| 590 | struct nfs_fh * |
| 591 | nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j) |
| 592 | { |
| 593 | struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| 594 | u32 i; |
| 595 | |
| 596 | if (flseg->stripe_type == STRIPE_SPARSE) { |
| 597 | if (flseg->num_fh == 1) |
| 598 | i = 0; |
| 599 | else if (flseg->num_fh == 0) |
| 600 | /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ |
| 601 | return NULL; |
| 602 | else |
| 603 | i = nfs4_fl_calc_ds_index(lseg, j); |
| 604 | } else |
| 605 | i = j; |
| 606 | return flseg->fh_array[i]; |
| 607 | } |
| 608 | |
Andy Adamson | 568e8c4 | 2011-03-01 01:34:22 +0000 | [diff] [blame] | 609 | static void |
| 610 | filelayout_mark_devid_negative(struct nfs4_file_layout_dsaddr *dsaddr, |
| 611 | int err, u32 ds_addr) |
| 612 | { |
| 613 | u32 *p = (u32 *)&dsaddr->deviceid; |
| 614 | |
| 615 | printk(KERN_ERR "NFS: data server %x connection error %d." |
| 616 | " Deviceid [%x%x%x%x] marked out of use.\n", |
| 617 | ds_addr, err, p[0], p[1], p[2], p[3]); |
| 618 | |
| 619 | spin_lock(&filelayout_deviceid_lock); |
| 620 | dsaddr->flags |= NFS4_DEVICE_ID_NEG_ENTRY; |
| 621 | spin_unlock(&filelayout_deviceid_lock); |
| 622 | } |
| 623 | |
Fred Isaman | cfe7f41 | 2011-03-01 01:34:18 +0000 | [diff] [blame] | 624 | struct nfs4_pnfs_ds * |
| 625 | nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx) |
| 626 | { |
| 627 | struct nfs4_file_layout_dsaddr *dsaddr = FILELAYOUT_LSEG(lseg)->dsaddr; |
| 628 | struct nfs4_pnfs_ds *ds = dsaddr->ds_list[ds_idx]; |
| 629 | |
| 630 | if (ds == NULL) { |
| 631 | printk(KERN_ERR "%s: No data server for offset index %d\n", |
| 632 | __func__, ds_idx); |
| 633 | return NULL; |
| 634 | } |
| 635 | |
| 636 | if (!ds->ds_clp) { |
Andy Adamson | 568e8c4 | 2011-03-01 01:34:22 +0000 | [diff] [blame] | 637 | struct nfs_server *s = NFS_SERVER(lseg->pls_layout->plh_inode); |
Fred Isaman | cfe7f41 | 2011-03-01 01:34:18 +0000 | [diff] [blame] | 638 | int err; |
| 639 | |
Andy Adamson | 568e8c4 | 2011-03-01 01:34:22 +0000 | [diff] [blame] | 640 | if (dsaddr->flags & NFS4_DEVICE_ID_NEG_ENTRY) { |
| 641 | /* Already tried to connect, don't try again */ |
| 642 | dprintk("%s Deviceid marked out of use\n", __func__); |
| 643 | return NULL; |
| 644 | } |
| 645 | err = nfs4_ds_connect(s, ds); |
Fred Isaman | cfe7f41 | 2011-03-01 01:34:18 +0000 | [diff] [blame] | 646 | if (err) { |
Andy Adamson | 568e8c4 | 2011-03-01 01:34:22 +0000 | [diff] [blame] | 647 | filelayout_mark_devid_negative(dsaddr, err, |
| 648 | ntohl(ds->ds_ip_addr)); |
Fred Isaman | cfe7f41 | 2011-03-01 01:34:18 +0000 | [diff] [blame] | 649 | return NULL; |
| 650 | } |
| 651 | } |
| 652 | return ds; |
| 653 | } |