| 1 | /* |
| 2 | * pNFS functions to call and manage layout drivers. |
| 3 | * |
| 4 | * Copyright (c) 2002 [year of first publication] |
| 5 | * The Regents of the University of Michigan |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * Dean Hildebrand <dhildebz@umich.edu> |
| 9 | * |
| 10 | * Permission is granted to use, copy, create derivative works, and |
| 11 | * redistribute this software and such derivative works for any purpose, |
| 12 | * so long as the name of the University of Michigan is not used in |
| 13 | * any advertising or publicity pertaining to the use or distribution |
| 14 | * of this software without specific, written prior authorization. If |
| 15 | * the above copyright notice or any other identification of the |
| 16 | * University of Michigan is included in any copy of any portion of |
| 17 | * this software, then the disclaimer below must also be included. |
| 18 | * |
| 19 | * This software is provided as is, without representation or warranty |
| 20 | * of any kind either express or implied, including without limitation |
| 21 | * the implied warranties of merchantability, fitness for a particular |
| 22 | * purpose, or noninfringement. The Regents of the University of |
| 23 | * Michigan shall not be liable for any damages, including special, |
| 24 | * indirect, incidental, or consequential damages, with respect to any |
| 25 | * claim arising out of or in connection with the use of the software, |
| 26 | * even if it has been or is hereafter advised of the possibility of |
| 27 | * such damages. |
| 28 | */ |
| 29 | |
| 30 | #include <linux/nfs_fs.h> |
| 31 | #include <linux/nfs_page.h> |
| 32 | #include <linux/module.h> |
| 33 | #include "internal.h" |
| 34 | #include "pnfs.h" |
| 35 | #include "iostat.h" |
| 36 | #include "nfs4trace.h" |
| 37 | #include "delegation.h" |
| 38 | #include "nfs42.h" |
| 39 | |
| 40 | #define NFSDBG_FACILITY NFSDBG_PNFS |
| 41 | #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) |
| 42 | |
| 43 | /* Locking: |
| 44 | * |
| 45 | * pnfs_spinlock: |
| 46 | * protects pnfs_modules_tbl. |
| 47 | */ |
| 48 | static DEFINE_SPINLOCK(pnfs_spinlock); |
| 49 | |
| 50 | /* |
| 51 | * pnfs_modules_tbl holds all pnfs modules |
| 52 | */ |
| 53 | static LIST_HEAD(pnfs_modules_tbl); |
| 54 | |
| 55 | static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo); |
| 56 | |
| 57 | /* Return the registered pnfs layout driver module matching given id */ |
| 58 | static struct pnfs_layoutdriver_type * |
| 59 | find_pnfs_driver_locked(u32 id) |
| 60 | { |
| 61 | struct pnfs_layoutdriver_type *local; |
| 62 | |
| 63 | list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) |
| 64 | if (local->id == id) |
| 65 | goto out; |
| 66 | local = NULL; |
| 67 | out: |
| 68 | dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); |
| 69 | return local; |
| 70 | } |
| 71 | |
| 72 | static struct pnfs_layoutdriver_type * |
| 73 | find_pnfs_driver(u32 id) |
| 74 | { |
| 75 | struct pnfs_layoutdriver_type *local; |
| 76 | |
| 77 | spin_lock(&pnfs_spinlock); |
| 78 | local = find_pnfs_driver_locked(id); |
| 79 | if (local != NULL && !try_module_get(local->owner)) { |
| 80 | dprintk("%s: Could not grab reference on module\n", __func__); |
| 81 | local = NULL; |
| 82 | } |
| 83 | spin_unlock(&pnfs_spinlock); |
| 84 | return local; |
| 85 | } |
| 86 | |
| 87 | void |
| 88 | unset_pnfs_layoutdriver(struct nfs_server *nfss) |
| 89 | { |
| 90 | if (nfss->pnfs_curr_ld) { |
| 91 | if (nfss->pnfs_curr_ld->clear_layoutdriver) |
| 92 | nfss->pnfs_curr_ld->clear_layoutdriver(nfss); |
| 93 | /* Decrement the MDS count. Purge the deviceid cache if zero */ |
| 94 | if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) |
| 95 | nfs4_deviceid_purge_client(nfss->nfs_client); |
| 96 | module_put(nfss->pnfs_curr_ld->owner); |
| 97 | } |
| 98 | nfss->pnfs_curr_ld = NULL; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Try to set the server's pnfs module to the pnfs layout type specified by id. |
| 103 | * Currently only one pNFS layout driver per filesystem is supported. |
| 104 | * |
| 105 | * @id layout type. Zero (illegal layout type) indicates pNFS not in use. |
| 106 | */ |
| 107 | void |
| 108 | set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, |
| 109 | u32 id) |
| 110 | { |
| 111 | struct pnfs_layoutdriver_type *ld_type = NULL; |
| 112 | |
| 113 | if (id == 0) |
| 114 | goto out_no_driver; |
| 115 | if (!(server->nfs_client->cl_exchange_flags & |
| 116 | (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { |
| 117 | printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n", |
| 118 | __func__, id, server->nfs_client->cl_exchange_flags); |
| 119 | goto out_no_driver; |
| 120 | } |
| 121 | ld_type = find_pnfs_driver(id); |
| 122 | if (!ld_type) { |
| 123 | request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); |
| 124 | ld_type = find_pnfs_driver(id); |
| 125 | if (!ld_type) { |
| 126 | dprintk("%s: No pNFS module found for %u.\n", |
| 127 | __func__, id); |
| 128 | goto out_no_driver; |
| 129 | } |
| 130 | } |
| 131 | server->pnfs_curr_ld = ld_type; |
| 132 | if (ld_type->set_layoutdriver |
| 133 | && ld_type->set_layoutdriver(server, mntfh)) { |
| 134 | printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " |
| 135 | "driver %u.\n", __func__, id); |
| 136 | module_put(ld_type->owner); |
| 137 | goto out_no_driver; |
| 138 | } |
| 139 | /* Bump the MDS count */ |
| 140 | atomic_inc(&server->nfs_client->cl_mds_count); |
| 141 | |
| 142 | dprintk("%s: pNFS module for %u set\n", __func__, id); |
| 143 | return; |
| 144 | |
| 145 | out_no_driver: |
| 146 | dprintk("%s: Using NFSv4 I/O\n", __func__); |
| 147 | server->pnfs_curr_ld = NULL; |
| 148 | } |
| 149 | |
| 150 | int |
| 151 | pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) |
| 152 | { |
| 153 | int status = -EINVAL; |
| 154 | struct pnfs_layoutdriver_type *tmp; |
| 155 | |
| 156 | if (ld_type->id == 0) { |
| 157 | printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); |
| 158 | return status; |
| 159 | } |
| 160 | if (!ld_type->alloc_lseg || !ld_type->free_lseg) { |
| 161 | printk(KERN_ERR "NFS: %s Layout driver must provide " |
| 162 | "alloc_lseg and free_lseg.\n", __func__); |
| 163 | return status; |
| 164 | } |
| 165 | |
| 166 | spin_lock(&pnfs_spinlock); |
| 167 | tmp = find_pnfs_driver_locked(ld_type->id); |
| 168 | if (!tmp) { |
| 169 | list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); |
| 170 | status = 0; |
| 171 | dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, |
| 172 | ld_type->name); |
| 173 | } else { |
| 174 | printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", |
| 175 | __func__, ld_type->id); |
| 176 | } |
| 177 | spin_unlock(&pnfs_spinlock); |
| 178 | |
| 179 | return status; |
| 180 | } |
| 181 | EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); |
| 182 | |
| 183 | void |
| 184 | pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) |
| 185 | { |
| 186 | dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); |
| 187 | spin_lock(&pnfs_spinlock); |
| 188 | list_del(&ld_type->pnfs_tblid); |
| 189 | spin_unlock(&pnfs_spinlock); |
| 190 | } |
| 191 | EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); |
| 192 | |
| 193 | /* |
| 194 | * pNFS client layout cache |
| 195 | */ |
| 196 | |
| 197 | /* Need to hold i_lock if caller does not already hold reference */ |
| 198 | void |
| 199 | pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) |
| 200 | { |
| 201 | atomic_inc(&lo->plh_refcount); |
| 202 | } |
| 203 | |
| 204 | static struct pnfs_layout_hdr * |
| 205 | pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) |
| 206 | { |
| 207 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; |
| 208 | return ld->alloc_layout_hdr(ino, gfp_flags); |
| 209 | } |
| 210 | |
| 211 | static void |
| 212 | pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) |
| 213 | { |
| 214 | struct nfs_server *server = NFS_SERVER(lo->plh_inode); |
| 215 | struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; |
| 216 | |
| 217 | if (!list_empty(&lo->plh_layouts)) { |
| 218 | struct nfs_client *clp = server->nfs_client; |
| 219 | |
| 220 | spin_lock(&clp->cl_lock); |
| 221 | list_del_init(&lo->plh_layouts); |
| 222 | spin_unlock(&clp->cl_lock); |
| 223 | } |
| 224 | put_rpccred(lo->plh_lc_cred); |
| 225 | return ld->free_layout_hdr(lo); |
| 226 | } |
| 227 | |
| 228 | static void |
| 229 | pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) |
| 230 | { |
| 231 | struct nfs_inode *nfsi = NFS_I(lo->plh_inode); |
| 232 | dprintk("%s: freeing layout cache %p\n", __func__, lo); |
| 233 | nfsi->layout = NULL; |
| 234 | /* Reset MDS Threshold I/O counters */ |
| 235 | nfsi->write_io = 0; |
| 236 | nfsi->read_io = 0; |
| 237 | } |
| 238 | |
| 239 | void |
| 240 | pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) |
| 241 | { |
| 242 | struct inode *inode = lo->plh_inode; |
| 243 | |
| 244 | pnfs_layoutreturn_before_put_layout_hdr(lo); |
| 245 | |
| 246 | if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { |
| 247 | if (!list_empty(&lo->plh_segs)) |
| 248 | WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); |
| 249 | pnfs_detach_layout_hdr(lo); |
| 250 | spin_unlock(&inode->i_lock); |
| 251 | pnfs_free_layout_hdr(lo); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Mark a pnfs_layout_hdr and all associated layout segments as invalid |
| 257 | * |
| 258 | * In order to continue using the pnfs_layout_hdr, a full recovery |
| 259 | * is required. |
| 260 | * Note that caller must hold inode->i_lock. |
| 261 | */ |
| 262 | static int |
| 263 | pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, |
| 264 | struct list_head *lseg_list) |
| 265 | { |
| 266 | struct pnfs_layout_range range = { |
| 267 | .iomode = IOMODE_ANY, |
| 268 | .offset = 0, |
| 269 | .length = NFS4_MAX_UINT64, |
| 270 | }; |
| 271 | |
| 272 | set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); |
| 273 | return pnfs_mark_matching_lsegs_invalid(lo, lseg_list, &range); |
| 274 | } |
| 275 | |
| 276 | static int |
| 277 | pnfs_iomode_to_fail_bit(u32 iomode) |
| 278 | { |
| 279 | return iomode == IOMODE_RW ? |
| 280 | NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; |
| 281 | } |
| 282 | |
| 283 | static void |
| 284 | pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) |
| 285 | { |
| 286 | lo->plh_retry_timestamp = jiffies; |
| 287 | if (!test_and_set_bit(fail_bit, &lo->plh_flags)) |
| 288 | atomic_inc(&lo->plh_refcount); |
| 289 | } |
| 290 | |
| 291 | static void |
| 292 | pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) |
| 293 | { |
| 294 | if (test_and_clear_bit(fail_bit, &lo->plh_flags)) |
| 295 | atomic_dec(&lo->plh_refcount); |
| 296 | } |
| 297 | |
| 298 | static void |
| 299 | pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) |
| 300 | { |
| 301 | struct inode *inode = lo->plh_inode; |
| 302 | struct pnfs_layout_range range = { |
| 303 | .iomode = iomode, |
| 304 | .offset = 0, |
| 305 | .length = NFS4_MAX_UINT64, |
| 306 | }; |
| 307 | LIST_HEAD(head); |
| 308 | |
| 309 | spin_lock(&inode->i_lock); |
| 310 | pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
| 311 | pnfs_mark_matching_lsegs_invalid(lo, &head, &range); |
| 312 | spin_unlock(&inode->i_lock); |
| 313 | pnfs_free_lseg_list(&head); |
| 314 | dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, |
| 315 | iomode == IOMODE_RW ? "RW" : "READ"); |
| 316 | } |
| 317 | |
| 318 | static bool |
| 319 | pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) |
| 320 | { |
| 321 | unsigned long start, end; |
| 322 | int fail_bit = pnfs_iomode_to_fail_bit(iomode); |
| 323 | |
| 324 | if (test_bit(fail_bit, &lo->plh_flags) == 0) |
| 325 | return false; |
| 326 | end = jiffies; |
| 327 | start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; |
| 328 | if (!time_in_range(lo->plh_retry_timestamp, start, end)) { |
| 329 | /* It is time to retry the failed layoutgets */ |
| 330 | pnfs_layout_clear_fail_bit(lo, fail_bit); |
| 331 | return false; |
| 332 | } |
| 333 | return true; |
| 334 | } |
| 335 | |
| 336 | static void |
| 337 | init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) |
| 338 | { |
| 339 | INIT_LIST_HEAD(&lseg->pls_list); |
| 340 | INIT_LIST_HEAD(&lseg->pls_lc_list); |
| 341 | atomic_set(&lseg->pls_refcount, 1); |
| 342 | smp_mb(); |
| 343 | set_bit(NFS_LSEG_VALID, &lseg->pls_flags); |
| 344 | lseg->pls_layout = lo; |
| 345 | } |
| 346 | |
| 347 | static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) |
| 348 | { |
| 349 | struct inode *ino = lseg->pls_layout->plh_inode; |
| 350 | |
| 351 | NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
| 352 | } |
| 353 | |
| 354 | static void |
| 355 | pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, |
| 356 | struct pnfs_layout_segment *lseg) |
| 357 | { |
| 358 | struct inode *inode = lo->plh_inode; |
| 359 | |
| 360 | WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| 361 | list_del_init(&lseg->pls_list); |
| 362 | /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ |
| 363 | atomic_dec(&lo->plh_refcount); |
| 364 | if (list_empty(&lo->plh_segs)) |
| 365 | clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
| 366 | rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); |
| 367 | } |
| 368 | |
| 369 | void |
| 370 | pnfs_put_lseg(struct pnfs_layout_segment *lseg) |
| 371 | { |
| 372 | struct pnfs_layout_hdr *lo; |
| 373 | struct inode *inode; |
| 374 | |
| 375 | if (!lseg) |
| 376 | return; |
| 377 | |
| 378 | dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, |
| 379 | atomic_read(&lseg->pls_refcount), |
| 380 | test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| 381 | |
| 382 | lo = lseg->pls_layout; |
| 383 | inode = lo->plh_inode; |
| 384 | |
| 385 | if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { |
| 386 | if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { |
| 387 | spin_unlock(&inode->i_lock); |
| 388 | return; |
| 389 | } |
| 390 | pnfs_get_layout_hdr(lo); |
| 391 | pnfs_layout_remove_lseg(lo, lseg); |
| 392 | spin_unlock(&inode->i_lock); |
| 393 | pnfs_free_lseg(lseg); |
| 394 | pnfs_put_layout_hdr(lo); |
| 395 | } |
| 396 | } |
| 397 | EXPORT_SYMBOL_GPL(pnfs_put_lseg); |
| 398 | |
| 399 | static void pnfs_free_lseg_async_work(struct work_struct *work) |
| 400 | { |
| 401 | struct pnfs_layout_segment *lseg; |
| 402 | struct pnfs_layout_hdr *lo; |
| 403 | |
| 404 | lseg = container_of(work, struct pnfs_layout_segment, pls_work); |
| 405 | lo = lseg->pls_layout; |
| 406 | |
| 407 | pnfs_free_lseg(lseg); |
| 408 | pnfs_put_layout_hdr(lo); |
| 409 | } |
| 410 | |
| 411 | static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg) |
| 412 | { |
| 413 | INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work); |
| 414 | schedule_work(&lseg->pls_work); |
| 415 | } |
| 416 | |
| 417 | void |
| 418 | pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg) |
| 419 | { |
| 420 | if (!lseg) |
| 421 | return; |
| 422 | |
| 423 | assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock); |
| 424 | |
| 425 | dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, |
| 426 | atomic_read(&lseg->pls_refcount), |
| 427 | test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| 428 | if (atomic_dec_and_test(&lseg->pls_refcount)) { |
| 429 | struct pnfs_layout_hdr *lo = lseg->pls_layout; |
| 430 | if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) |
| 431 | return; |
| 432 | pnfs_get_layout_hdr(lo); |
| 433 | pnfs_layout_remove_lseg(lo, lseg); |
| 434 | pnfs_free_lseg_async(lseg); |
| 435 | } |
| 436 | } |
| 437 | EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked); |
| 438 | |
| 439 | static u64 |
| 440 | end_offset(u64 start, u64 len) |
| 441 | { |
| 442 | u64 end; |
| 443 | |
| 444 | end = start + len; |
| 445 | return end >= start ? end : NFS4_MAX_UINT64; |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * is l2 fully contained in l1? |
| 450 | * start1 end1 |
| 451 | * [----------------------------------) |
| 452 | * start2 end2 |
| 453 | * [----------------) |
| 454 | */ |
| 455 | static bool |
| 456 | pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, |
| 457 | const struct pnfs_layout_range *l2) |
| 458 | { |
| 459 | u64 start1 = l1->offset; |
| 460 | u64 end1 = end_offset(start1, l1->length); |
| 461 | u64 start2 = l2->offset; |
| 462 | u64 end2 = end_offset(start2, l2->length); |
| 463 | |
| 464 | return (start1 <= start2) && (end1 >= end2); |
| 465 | } |
| 466 | |
| 467 | /* |
| 468 | * is l1 and l2 intersecting? |
| 469 | * start1 end1 |
| 470 | * [----------------------------------) |
| 471 | * start2 end2 |
| 472 | * [----------------) |
| 473 | */ |
| 474 | static bool |
| 475 | pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1, |
| 476 | const struct pnfs_layout_range *l2) |
| 477 | { |
| 478 | u64 start1 = l1->offset; |
| 479 | u64 end1 = end_offset(start1, l1->length); |
| 480 | u64 start2 = l2->offset; |
| 481 | u64 end2 = end_offset(start2, l2->length); |
| 482 | |
| 483 | return (end1 == NFS4_MAX_UINT64 || end1 > start2) && |
| 484 | (end2 == NFS4_MAX_UINT64 || end2 > start1); |
| 485 | } |
| 486 | |
| 487 | static bool |
| 488 | should_free_lseg(const struct pnfs_layout_range *lseg_range, |
| 489 | const struct pnfs_layout_range *recall_range) |
| 490 | { |
| 491 | return (recall_range->iomode == IOMODE_ANY || |
| 492 | lseg_range->iomode == recall_range->iomode) && |
| 493 | pnfs_lseg_range_intersecting(lseg_range, recall_range); |
| 494 | } |
| 495 | |
| 496 | static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, |
| 497 | struct list_head *tmp_list) |
| 498 | { |
| 499 | if (!atomic_dec_and_test(&lseg->pls_refcount)) |
| 500 | return false; |
| 501 | pnfs_layout_remove_lseg(lseg->pls_layout, lseg); |
| 502 | list_add(&lseg->pls_list, tmp_list); |
| 503 | return true; |
| 504 | } |
| 505 | |
| 506 | /* Returns 1 if lseg is removed from list, 0 otherwise */ |
| 507 | static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, |
| 508 | struct list_head *tmp_list) |
| 509 | { |
| 510 | int rv = 0; |
| 511 | |
| 512 | if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { |
| 513 | /* Remove the reference keeping the lseg in the |
| 514 | * list. It will now be removed when all |
| 515 | * outstanding io is finished. |
| 516 | */ |
| 517 | dprintk("%s: lseg %p ref %d\n", __func__, lseg, |
| 518 | atomic_read(&lseg->pls_refcount)); |
| 519 | if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) |
| 520 | rv = 1; |
| 521 | } |
| 522 | return rv; |
| 523 | } |
| 524 | |
| 525 | /* Returns count of number of matching invalid lsegs remaining in list |
| 526 | * after call. |
| 527 | */ |
| 528 | int |
| 529 | pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
| 530 | struct list_head *tmp_list, |
| 531 | const struct pnfs_layout_range *recall_range) |
| 532 | { |
| 533 | struct pnfs_layout_segment *lseg, *next; |
| 534 | int remaining = 0; |
| 535 | |
| 536 | dprintk("%s:Begin lo %p\n", __func__, lo); |
| 537 | |
| 538 | if (list_empty(&lo->plh_segs)) |
| 539 | return 0; |
| 540 | list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
| 541 | if (!recall_range || |
| 542 | should_free_lseg(&lseg->pls_range, recall_range)) { |
| 543 | dprintk("%s: freeing lseg %p iomode %d " |
| 544 | "offset %llu length %llu\n", __func__, |
| 545 | lseg, lseg->pls_range.iomode, lseg->pls_range.offset, |
| 546 | lseg->pls_range.length); |
| 547 | if (!mark_lseg_invalid(lseg, tmp_list)) |
| 548 | remaining++; |
| 549 | } |
| 550 | dprintk("%s:Return %i\n", __func__, remaining); |
| 551 | return remaining; |
| 552 | } |
| 553 | |
| 554 | /* note free_me must contain lsegs from a single layout_hdr */ |
| 555 | void |
| 556 | pnfs_free_lseg_list(struct list_head *free_me) |
| 557 | { |
| 558 | struct pnfs_layout_segment *lseg, *tmp; |
| 559 | |
| 560 | if (list_empty(free_me)) |
| 561 | return; |
| 562 | |
| 563 | list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { |
| 564 | list_del(&lseg->pls_list); |
| 565 | pnfs_free_lseg(lseg); |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | void |
| 570 | pnfs_destroy_layout(struct nfs_inode *nfsi) |
| 571 | { |
| 572 | struct pnfs_layout_hdr *lo; |
| 573 | LIST_HEAD(tmp_list); |
| 574 | |
| 575 | spin_lock(&nfsi->vfs_inode.i_lock); |
| 576 | lo = nfsi->layout; |
| 577 | if (lo) { |
| 578 | pnfs_get_layout_hdr(lo); |
| 579 | pnfs_mark_layout_stateid_invalid(lo, &tmp_list); |
| 580 | pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); |
| 581 | pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); |
| 582 | spin_unlock(&nfsi->vfs_inode.i_lock); |
| 583 | pnfs_free_lseg_list(&tmp_list); |
| 584 | pnfs_put_layout_hdr(lo); |
| 585 | } else |
| 586 | spin_unlock(&nfsi->vfs_inode.i_lock); |
| 587 | } |
| 588 | EXPORT_SYMBOL_GPL(pnfs_destroy_layout); |
| 589 | |
| 590 | static bool |
| 591 | pnfs_layout_add_bulk_destroy_list(struct inode *inode, |
| 592 | struct list_head *layout_list) |
| 593 | { |
| 594 | struct pnfs_layout_hdr *lo; |
| 595 | bool ret = false; |
| 596 | |
| 597 | spin_lock(&inode->i_lock); |
| 598 | lo = NFS_I(inode)->layout; |
| 599 | if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { |
| 600 | pnfs_get_layout_hdr(lo); |
| 601 | list_add(&lo->plh_bulk_destroy, layout_list); |
| 602 | ret = true; |
| 603 | } |
| 604 | spin_unlock(&inode->i_lock); |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | /* Caller must hold rcu_read_lock and clp->cl_lock */ |
| 609 | static int |
| 610 | pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, |
| 611 | struct nfs_server *server, |
| 612 | struct list_head *layout_list) |
| 613 | { |
| 614 | struct pnfs_layout_hdr *lo, *next; |
| 615 | struct inode *inode; |
| 616 | |
| 617 | list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { |
| 618 | inode = igrab(lo->plh_inode); |
| 619 | if (inode == NULL) |
| 620 | continue; |
| 621 | list_del_init(&lo->plh_layouts); |
| 622 | if (pnfs_layout_add_bulk_destroy_list(inode, layout_list)) |
| 623 | continue; |
| 624 | rcu_read_unlock(); |
| 625 | spin_unlock(&clp->cl_lock); |
| 626 | iput(inode); |
| 627 | spin_lock(&clp->cl_lock); |
| 628 | rcu_read_lock(); |
| 629 | return -EAGAIN; |
| 630 | } |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | static int |
| 635 | pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, |
| 636 | bool is_bulk_recall) |
| 637 | { |
| 638 | struct pnfs_layout_hdr *lo; |
| 639 | struct inode *inode; |
| 640 | LIST_HEAD(lseg_list); |
| 641 | int ret = 0; |
| 642 | |
| 643 | while (!list_empty(layout_list)) { |
| 644 | lo = list_entry(layout_list->next, struct pnfs_layout_hdr, |
| 645 | plh_bulk_destroy); |
| 646 | dprintk("%s freeing layout for inode %lu\n", __func__, |
| 647 | lo->plh_inode->i_ino); |
| 648 | inode = lo->plh_inode; |
| 649 | |
| 650 | pnfs_layoutcommit_inode(inode, false); |
| 651 | |
| 652 | spin_lock(&inode->i_lock); |
| 653 | list_del_init(&lo->plh_bulk_destroy); |
| 654 | if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { |
| 655 | if (is_bulk_recall) |
| 656 | set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
| 657 | ret = -EAGAIN; |
| 658 | } |
| 659 | spin_unlock(&inode->i_lock); |
| 660 | pnfs_free_lseg_list(&lseg_list); |
| 661 | /* Free all lsegs that are attached to commit buckets */ |
| 662 | nfs_commit_inode(inode, 0); |
| 663 | pnfs_put_layout_hdr(lo); |
| 664 | iput(inode); |
| 665 | } |
| 666 | return ret; |
| 667 | } |
| 668 | |
| 669 | int |
| 670 | pnfs_destroy_layouts_byfsid(struct nfs_client *clp, |
| 671 | struct nfs_fsid *fsid, |
| 672 | bool is_recall) |
| 673 | { |
| 674 | struct nfs_server *server; |
| 675 | LIST_HEAD(layout_list); |
| 676 | |
| 677 | spin_lock(&clp->cl_lock); |
| 678 | rcu_read_lock(); |
| 679 | restart: |
| 680 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 681 | if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) |
| 682 | continue; |
| 683 | if (pnfs_layout_bulk_destroy_byserver_locked(clp, |
| 684 | server, |
| 685 | &layout_list) != 0) |
| 686 | goto restart; |
| 687 | } |
| 688 | rcu_read_unlock(); |
| 689 | spin_unlock(&clp->cl_lock); |
| 690 | |
| 691 | if (list_empty(&layout_list)) |
| 692 | return 0; |
| 693 | return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); |
| 694 | } |
| 695 | |
| 696 | int |
| 697 | pnfs_destroy_layouts_byclid(struct nfs_client *clp, |
| 698 | bool is_recall) |
| 699 | { |
| 700 | struct nfs_server *server; |
| 701 | LIST_HEAD(layout_list); |
| 702 | |
| 703 | spin_lock(&clp->cl_lock); |
| 704 | rcu_read_lock(); |
| 705 | restart: |
| 706 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| 707 | if (pnfs_layout_bulk_destroy_byserver_locked(clp, |
| 708 | server, |
| 709 | &layout_list) != 0) |
| 710 | goto restart; |
| 711 | } |
| 712 | rcu_read_unlock(); |
| 713 | spin_unlock(&clp->cl_lock); |
| 714 | |
| 715 | if (list_empty(&layout_list)) |
| 716 | return 0; |
| 717 | return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * Called by the state manger to remove all layouts established under an |
| 722 | * expired lease. |
| 723 | */ |
| 724 | void |
| 725 | pnfs_destroy_all_layouts(struct nfs_client *clp) |
| 726 | { |
| 727 | nfs4_deviceid_mark_client_invalid(clp); |
| 728 | nfs4_deviceid_purge_client(clp); |
| 729 | |
| 730 | pnfs_destroy_layouts_byclid(clp, false); |
| 731 | } |
| 732 | |
| 733 | /* |
| 734 | * Compare 2 layout stateid sequence ids, to see which is newer, |
| 735 | * taking into account wraparound issues. |
| 736 | */ |
| 737 | static bool pnfs_seqid_is_newer(u32 s1, u32 s2) |
| 738 | { |
| 739 | return (s32)(s1 - s2) > 0; |
| 740 | } |
| 741 | |
| 742 | /* update lo->plh_stateid with new if is more recent */ |
| 743 | void |
| 744 | pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, |
| 745 | bool update_barrier) |
| 746 | { |
| 747 | u32 oldseq, newseq, new_barrier; |
| 748 | int empty = list_empty(&lo->plh_segs); |
| 749 | |
| 750 | oldseq = be32_to_cpu(lo->plh_stateid.seqid); |
| 751 | newseq = be32_to_cpu(new->seqid); |
| 752 | if (empty || pnfs_seqid_is_newer(newseq, oldseq)) { |
| 753 | nfs4_stateid_copy(&lo->plh_stateid, new); |
| 754 | if (update_barrier) { |
| 755 | new_barrier = be32_to_cpu(new->seqid); |
| 756 | } else { |
| 757 | /* Because of wraparound, we want to keep the barrier |
| 758 | * "close" to the current seqids. |
| 759 | */ |
| 760 | new_barrier = newseq - atomic_read(&lo->plh_outstanding); |
| 761 | } |
| 762 | if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) |
| 763 | lo->plh_barrier = new_barrier; |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | static bool |
| 768 | pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, |
| 769 | const nfs4_stateid *stateid) |
| 770 | { |
| 771 | u32 seqid = be32_to_cpu(stateid->seqid); |
| 772 | |
| 773 | return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); |
| 774 | } |
| 775 | |
| 776 | /* lget is set to 1 if called from inside send_layoutget call chain */ |
| 777 | static bool |
| 778 | pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) |
| 779 | { |
| 780 | return lo->plh_block_lgets || |
| 781 | test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
| 782 | } |
| 783 | |
| 784 | int |
| 785 | pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, |
| 786 | const struct pnfs_layout_range *range, |
| 787 | struct nfs4_state *open_state) |
| 788 | { |
| 789 | int status = 0; |
| 790 | |
| 791 | dprintk("--> %s\n", __func__); |
| 792 | spin_lock(&lo->plh_inode->i_lock); |
| 793 | if (pnfs_layoutgets_blocked(lo)) { |
| 794 | status = -EAGAIN; |
| 795 | } else if (!nfs4_valid_open_stateid(open_state)) { |
| 796 | status = -EBADF; |
| 797 | } else if (list_empty(&lo->plh_segs) || |
| 798 | test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { |
| 799 | int seq; |
| 800 | |
| 801 | do { |
| 802 | seq = read_seqbegin(&open_state->seqlock); |
| 803 | nfs4_stateid_copy(dst, &open_state->stateid); |
| 804 | } while (read_seqretry(&open_state->seqlock, seq)); |
| 805 | } else |
| 806 | nfs4_stateid_copy(dst, &lo->plh_stateid); |
| 807 | spin_unlock(&lo->plh_inode->i_lock); |
| 808 | dprintk("<-- %s\n", __func__); |
| 809 | return status; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * Get layout from server. |
| 814 | * for now, assume that whole file layouts are requested. |
| 815 | * arg->offset: 0 |
| 816 | * arg->length: all ones |
| 817 | */ |
| 818 | static struct pnfs_layout_segment * |
| 819 | send_layoutget(struct pnfs_layout_hdr *lo, |
| 820 | struct nfs_open_context *ctx, |
| 821 | const struct pnfs_layout_range *range, |
| 822 | gfp_t gfp_flags) |
| 823 | { |
| 824 | struct inode *ino = lo->plh_inode; |
| 825 | struct nfs_server *server = NFS_SERVER(ino); |
| 826 | struct nfs4_layoutget *lgp; |
| 827 | struct pnfs_layout_segment *lseg; |
| 828 | loff_t i_size; |
| 829 | |
| 830 | dprintk("--> %s\n", __func__); |
| 831 | |
| 832 | /* |
| 833 | * Synchronously retrieve layout information from server and |
| 834 | * store in lseg. If we race with a concurrent seqid morphing |
| 835 | * op, then re-send the LAYOUTGET. |
| 836 | */ |
| 837 | do { |
| 838 | lgp = kzalloc(sizeof(*lgp), gfp_flags); |
| 839 | if (lgp == NULL) |
| 840 | return NULL; |
| 841 | |
| 842 | i_size = i_size_read(ino); |
| 843 | |
| 844 | lgp->args.minlength = PAGE_CACHE_SIZE; |
| 845 | if (lgp->args.minlength > range->length) |
| 846 | lgp->args.minlength = range->length; |
| 847 | if (range->iomode == IOMODE_READ) { |
| 848 | if (range->offset >= i_size) |
| 849 | lgp->args.minlength = 0; |
| 850 | else if (i_size - range->offset < lgp->args.minlength) |
| 851 | lgp->args.minlength = i_size - range->offset; |
| 852 | } |
| 853 | lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; |
| 854 | pnfs_copy_range(&lgp->args.range, range); |
| 855 | lgp->args.type = server->pnfs_curr_ld->id; |
| 856 | lgp->args.inode = ino; |
| 857 | lgp->args.ctx = get_nfs_open_context(ctx); |
| 858 | lgp->gfp_flags = gfp_flags; |
| 859 | lgp->cred = lo->plh_lc_cred; |
| 860 | |
| 861 | lseg = nfs4_proc_layoutget(lgp, gfp_flags); |
| 862 | } while (lseg == ERR_PTR(-EAGAIN)); |
| 863 | |
| 864 | if (IS_ERR(lseg) && !nfs_error_is_fatal(PTR_ERR(lseg))) |
| 865 | lseg = NULL; |
| 866 | else |
| 867 | pnfs_layout_clear_fail_bit(lo, |
| 868 | pnfs_iomode_to_fail_bit(range->iomode)); |
| 869 | |
| 870 | return lseg; |
| 871 | } |
| 872 | |
| 873 | static void pnfs_clear_layoutcommit(struct inode *inode, |
| 874 | struct list_head *head) |
| 875 | { |
| 876 | struct nfs_inode *nfsi = NFS_I(inode); |
| 877 | struct pnfs_layout_segment *lseg, *tmp; |
| 878 | |
| 879 | if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
| 880 | return; |
| 881 | list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { |
| 882 | if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) |
| 883 | continue; |
| 884 | pnfs_lseg_dec_and_remove_zero(lseg, head); |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) |
| 889 | { |
| 890 | clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); |
| 891 | smp_mb__after_atomic(); |
| 892 | wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); |
| 893 | rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); |
| 894 | } |
| 895 | |
| 896 | static bool |
| 897 | pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo) |
| 898 | { |
| 899 | if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) |
| 900 | return false; |
| 901 | lo->plh_return_iomode = 0; |
| 902 | pnfs_get_layout_hdr(lo); |
| 903 | clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); |
| 904 | return true; |
| 905 | } |
| 906 | |
| 907 | static int |
| 908 | pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid, |
| 909 | enum pnfs_iomode iomode, bool sync) |
| 910 | { |
| 911 | struct inode *ino = lo->plh_inode; |
| 912 | struct nfs4_layoutreturn *lrp; |
| 913 | int status = 0; |
| 914 | |
| 915 | lrp = kzalloc(sizeof(*lrp), GFP_NOFS); |
| 916 | if (unlikely(lrp == NULL)) { |
| 917 | status = -ENOMEM; |
| 918 | spin_lock(&ino->i_lock); |
| 919 | pnfs_clear_layoutreturn_waitbit(lo); |
| 920 | spin_unlock(&ino->i_lock); |
| 921 | pnfs_put_layout_hdr(lo); |
| 922 | goto out; |
| 923 | } |
| 924 | |
| 925 | nfs4_stateid_copy(&lrp->args.stateid, stateid); |
| 926 | lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id; |
| 927 | lrp->args.inode = ino; |
| 928 | lrp->args.range.iomode = iomode; |
| 929 | lrp->args.range.offset = 0; |
| 930 | lrp->args.range.length = NFS4_MAX_UINT64; |
| 931 | lrp->args.layout = lo; |
| 932 | lrp->clp = NFS_SERVER(ino)->nfs_client; |
| 933 | lrp->cred = lo->plh_lc_cred; |
| 934 | |
| 935 | status = nfs4_proc_layoutreturn(lrp, sync); |
| 936 | out: |
| 937 | dprintk("<-- %s status: %d\n", __func__, status); |
| 938 | return status; |
| 939 | } |
| 940 | |
| 941 | /* Return true if layoutreturn is needed */ |
| 942 | static bool |
| 943 | pnfs_layout_need_return(struct pnfs_layout_hdr *lo) |
| 944 | { |
| 945 | struct pnfs_layout_segment *s; |
| 946 | |
| 947 | if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| 948 | return false; |
| 949 | |
| 950 | /* Defer layoutreturn until all lsegs are done */ |
| 951 | list_for_each_entry(s, &lo->plh_segs, pls_list) { |
| 952 | if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) |
| 953 | return false; |
| 954 | } |
| 955 | |
| 956 | return true; |
| 957 | } |
| 958 | |
| 959 | static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) |
| 960 | { |
| 961 | struct inode *inode= lo->plh_inode; |
| 962 | |
| 963 | if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| 964 | return; |
| 965 | spin_lock(&inode->i_lock); |
| 966 | if (pnfs_layout_need_return(lo)) { |
| 967 | nfs4_stateid stateid; |
| 968 | enum pnfs_iomode iomode; |
| 969 | bool send; |
| 970 | |
| 971 | nfs4_stateid_copy(&stateid, &lo->plh_stateid); |
| 972 | iomode = lo->plh_return_iomode; |
| 973 | send = pnfs_prepare_layoutreturn(lo); |
| 974 | spin_unlock(&inode->i_lock); |
| 975 | if (send) { |
| 976 | /* Send an async layoutreturn so we dont deadlock */ |
| 977 | pnfs_send_layoutreturn(lo, &stateid, iomode, false); |
| 978 | } |
| 979 | } else |
| 980 | spin_unlock(&inode->i_lock); |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr |
| 985 | * when the layout segment list is empty. |
| 986 | * |
| 987 | * Note that a pnfs_layout_hdr can exist with an empty layout segment |
| 988 | * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the |
| 989 | * deviceid is marked invalid. |
| 990 | */ |
| 991 | int |
| 992 | _pnfs_return_layout(struct inode *ino) |
| 993 | { |
| 994 | struct pnfs_layout_hdr *lo = NULL; |
| 995 | struct nfs_inode *nfsi = NFS_I(ino); |
| 996 | LIST_HEAD(tmp_list); |
| 997 | nfs4_stateid stateid; |
| 998 | int status = 0, empty; |
| 999 | bool send; |
| 1000 | |
| 1001 | dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); |
| 1002 | |
| 1003 | spin_lock(&ino->i_lock); |
| 1004 | lo = nfsi->layout; |
| 1005 | if (!lo) { |
| 1006 | spin_unlock(&ino->i_lock); |
| 1007 | dprintk("NFS: %s no layout to return\n", __func__); |
| 1008 | goto out; |
| 1009 | } |
| 1010 | nfs4_stateid_copy(&stateid, &nfsi->layout->plh_stateid); |
| 1011 | /* Reference matched in nfs4_layoutreturn_release */ |
| 1012 | pnfs_get_layout_hdr(lo); |
| 1013 | empty = list_empty(&lo->plh_segs); |
| 1014 | pnfs_clear_layoutcommit(ino, &tmp_list); |
| 1015 | pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); |
| 1016 | |
| 1017 | if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { |
| 1018 | struct pnfs_layout_range range = { |
| 1019 | .iomode = IOMODE_ANY, |
| 1020 | .offset = 0, |
| 1021 | .length = NFS4_MAX_UINT64, |
| 1022 | }; |
| 1023 | NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); |
| 1024 | } |
| 1025 | |
| 1026 | /* Don't send a LAYOUTRETURN if list was initially empty */ |
| 1027 | if (empty) { |
| 1028 | spin_unlock(&ino->i_lock); |
| 1029 | dprintk("NFS: %s no layout segments to return\n", __func__); |
| 1030 | goto out_put_layout_hdr; |
| 1031 | } |
| 1032 | |
| 1033 | set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); |
| 1034 | send = pnfs_prepare_layoutreturn(lo); |
| 1035 | spin_unlock(&ino->i_lock); |
| 1036 | pnfs_free_lseg_list(&tmp_list); |
| 1037 | if (send) |
| 1038 | status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true); |
| 1039 | out_put_layout_hdr: |
| 1040 | pnfs_put_layout_hdr(lo); |
| 1041 | out: |
| 1042 | dprintk("<-- %s status: %d\n", __func__, status); |
| 1043 | return status; |
| 1044 | } |
| 1045 | EXPORT_SYMBOL_GPL(_pnfs_return_layout); |
| 1046 | |
| 1047 | int |
| 1048 | pnfs_commit_and_return_layout(struct inode *inode) |
| 1049 | { |
| 1050 | struct pnfs_layout_hdr *lo; |
| 1051 | int ret; |
| 1052 | |
| 1053 | spin_lock(&inode->i_lock); |
| 1054 | lo = NFS_I(inode)->layout; |
| 1055 | if (lo == NULL) { |
| 1056 | spin_unlock(&inode->i_lock); |
| 1057 | return 0; |
| 1058 | } |
| 1059 | pnfs_get_layout_hdr(lo); |
| 1060 | /* Block new layoutgets and read/write to ds */ |
| 1061 | lo->plh_block_lgets++; |
| 1062 | spin_unlock(&inode->i_lock); |
| 1063 | filemap_fdatawait(inode->i_mapping); |
| 1064 | ret = pnfs_layoutcommit_inode(inode, true); |
| 1065 | if (ret == 0) |
| 1066 | ret = _pnfs_return_layout(inode); |
| 1067 | spin_lock(&inode->i_lock); |
| 1068 | lo->plh_block_lgets--; |
| 1069 | spin_unlock(&inode->i_lock); |
| 1070 | pnfs_put_layout_hdr(lo); |
| 1071 | return ret; |
| 1072 | } |
| 1073 | |
| 1074 | bool pnfs_roc(struct inode *ino) |
| 1075 | { |
| 1076 | struct nfs_inode *nfsi = NFS_I(ino); |
| 1077 | struct nfs_open_context *ctx; |
| 1078 | struct nfs4_state *state; |
| 1079 | struct pnfs_layout_hdr *lo; |
| 1080 | struct pnfs_layout_segment *lseg, *tmp; |
| 1081 | nfs4_stateid stateid; |
| 1082 | LIST_HEAD(tmp_list); |
| 1083 | bool found = false, layoutreturn = false, roc = false; |
| 1084 | |
| 1085 | spin_lock(&ino->i_lock); |
| 1086 | lo = nfsi->layout; |
| 1087 | if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) |
| 1088 | goto out_noroc; |
| 1089 | |
| 1090 | /* no roc if we hold a delegation */ |
| 1091 | if (nfs4_check_delegation(ino, FMODE_READ)) |
| 1092 | goto out_noroc; |
| 1093 | |
| 1094 | list_for_each_entry(ctx, &nfsi->open_files, list) { |
| 1095 | state = ctx->state; |
| 1096 | /* Don't return layout if there is open file state */ |
| 1097 | if (state != NULL && state->state != 0) |
| 1098 | goto out_noroc; |
| 1099 | } |
| 1100 | |
| 1101 | nfs4_stateid_copy(&stateid, &lo->plh_stateid); |
| 1102 | /* always send layoutreturn if being marked so */ |
| 1103 | if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED, |
| 1104 | &lo->plh_flags)) |
| 1105 | layoutreturn = pnfs_prepare_layoutreturn(lo); |
| 1106 | |
| 1107 | list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) |
| 1108 | /* If we are sending layoutreturn, invalidate all valid lsegs */ |
| 1109 | if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { |
| 1110 | mark_lseg_invalid(lseg, &tmp_list); |
| 1111 | found = true; |
| 1112 | } |
| 1113 | /* ROC in two conditions: |
| 1114 | * 1. there are ROC lsegs |
| 1115 | * 2. we don't send layoutreturn |
| 1116 | */ |
| 1117 | if (found && !layoutreturn) { |
| 1118 | /* lo ref dropped in pnfs_roc_release() */ |
| 1119 | pnfs_get_layout_hdr(lo); |
| 1120 | roc = true; |
| 1121 | } |
| 1122 | |
| 1123 | out_noroc: |
| 1124 | spin_unlock(&ino->i_lock); |
| 1125 | pnfs_free_lseg_list(&tmp_list); |
| 1126 | pnfs_layoutcommit_inode(ino, true); |
| 1127 | if (layoutreturn) |
| 1128 | pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true); |
| 1129 | return roc; |
| 1130 | } |
| 1131 | |
| 1132 | void pnfs_roc_release(struct inode *ino) |
| 1133 | { |
| 1134 | struct pnfs_layout_hdr *lo; |
| 1135 | |
| 1136 | spin_lock(&ino->i_lock); |
| 1137 | lo = NFS_I(ino)->layout; |
| 1138 | pnfs_clear_layoutreturn_waitbit(lo); |
| 1139 | if (atomic_dec_and_test(&lo->plh_refcount)) { |
| 1140 | pnfs_detach_layout_hdr(lo); |
| 1141 | spin_unlock(&ino->i_lock); |
| 1142 | pnfs_free_layout_hdr(lo); |
| 1143 | } else |
| 1144 | spin_unlock(&ino->i_lock); |
| 1145 | } |
| 1146 | |
| 1147 | void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) |
| 1148 | { |
| 1149 | struct pnfs_layout_hdr *lo; |
| 1150 | |
| 1151 | spin_lock(&ino->i_lock); |
| 1152 | lo = NFS_I(ino)->layout; |
| 1153 | pnfs_mark_layout_returned_if_empty(lo); |
| 1154 | if (pnfs_seqid_is_newer(barrier, lo->plh_barrier)) |
| 1155 | lo->plh_barrier = barrier; |
| 1156 | spin_unlock(&ino->i_lock); |
| 1157 | trace_nfs4_layoutreturn_on_close(ino, 0); |
| 1158 | } |
| 1159 | |
| 1160 | void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier) |
| 1161 | { |
| 1162 | struct nfs_inode *nfsi = NFS_I(ino); |
| 1163 | struct pnfs_layout_hdr *lo; |
| 1164 | u32 current_seqid; |
| 1165 | |
| 1166 | spin_lock(&ino->i_lock); |
| 1167 | lo = nfsi->layout; |
| 1168 | current_seqid = be32_to_cpu(lo->plh_stateid.seqid); |
| 1169 | |
| 1170 | /* Since close does not return a layout stateid for use as |
| 1171 | * a barrier, we choose the worst-case barrier. |
| 1172 | */ |
| 1173 | *barrier = current_seqid + atomic_read(&lo->plh_outstanding); |
| 1174 | spin_unlock(&ino->i_lock); |
| 1175 | } |
| 1176 | |
| 1177 | bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) |
| 1178 | { |
| 1179 | struct nfs_inode *nfsi = NFS_I(ino); |
| 1180 | struct pnfs_layout_hdr *lo; |
| 1181 | bool sleep = false; |
| 1182 | |
| 1183 | /* we might not have grabbed lo reference. so need to check under |
| 1184 | * i_lock */ |
| 1185 | spin_lock(&ino->i_lock); |
| 1186 | lo = nfsi->layout; |
| 1187 | if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) |
| 1188 | sleep = true; |
| 1189 | spin_unlock(&ino->i_lock); |
| 1190 | |
| 1191 | if (sleep) |
| 1192 | rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); |
| 1193 | |
| 1194 | return sleep; |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * Compare two layout segments for sorting into layout cache. |
| 1199 | * We want to preferentially return RW over RO layouts, so ensure those |
| 1200 | * are seen first. |
| 1201 | */ |
| 1202 | static s64 |
| 1203 | pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, |
| 1204 | const struct pnfs_layout_range *l2) |
| 1205 | { |
| 1206 | s64 d; |
| 1207 | |
| 1208 | /* high offset > low offset */ |
| 1209 | d = l1->offset - l2->offset; |
| 1210 | if (d) |
| 1211 | return d; |
| 1212 | |
| 1213 | /* short length > long length */ |
| 1214 | d = l2->length - l1->length; |
| 1215 | if (d) |
| 1216 | return d; |
| 1217 | |
| 1218 | /* read > read/write */ |
| 1219 | return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); |
| 1220 | } |
| 1221 | |
| 1222 | static bool |
| 1223 | pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, |
| 1224 | const struct pnfs_layout_range *l2) |
| 1225 | { |
| 1226 | return pnfs_lseg_range_cmp(l1, l2) > 0; |
| 1227 | } |
| 1228 | |
| 1229 | static bool |
| 1230 | pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, |
| 1231 | struct pnfs_layout_segment *old) |
| 1232 | { |
| 1233 | return false; |
| 1234 | } |
| 1235 | |
| 1236 | void |
| 1237 | pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, |
| 1238 | struct pnfs_layout_segment *lseg, |
| 1239 | bool (*is_after)(const struct pnfs_layout_range *, |
| 1240 | const struct pnfs_layout_range *), |
| 1241 | bool (*do_merge)(struct pnfs_layout_segment *, |
| 1242 | struct pnfs_layout_segment *), |
| 1243 | struct list_head *free_me) |
| 1244 | { |
| 1245 | struct pnfs_layout_segment *lp, *tmp; |
| 1246 | |
| 1247 | dprintk("%s:Begin\n", __func__); |
| 1248 | |
| 1249 | list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { |
| 1250 | if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) |
| 1251 | continue; |
| 1252 | if (do_merge(lseg, lp)) { |
| 1253 | mark_lseg_invalid(lp, free_me); |
| 1254 | continue; |
| 1255 | } |
| 1256 | if (is_after(&lseg->pls_range, &lp->pls_range)) |
| 1257 | continue; |
| 1258 | list_add_tail(&lseg->pls_list, &lp->pls_list); |
| 1259 | dprintk("%s: inserted lseg %p " |
| 1260 | "iomode %d offset %llu length %llu before " |
| 1261 | "lp %p iomode %d offset %llu length %llu\n", |
| 1262 | __func__, lseg, lseg->pls_range.iomode, |
| 1263 | lseg->pls_range.offset, lseg->pls_range.length, |
| 1264 | lp, lp->pls_range.iomode, lp->pls_range.offset, |
| 1265 | lp->pls_range.length); |
| 1266 | goto out; |
| 1267 | } |
| 1268 | list_add_tail(&lseg->pls_list, &lo->plh_segs); |
| 1269 | dprintk("%s: inserted lseg %p " |
| 1270 | "iomode %d offset %llu length %llu at tail\n", |
| 1271 | __func__, lseg, lseg->pls_range.iomode, |
| 1272 | lseg->pls_range.offset, lseg->pls_range.length); |
| 1273 | out: |
| 1274 | pnfs_get_layout_hdr(lo); |
| 1275 | |
| 1276 | dprintk("%s:Return\n", __func__); |
| 1277 | } |
| 1278 | EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); |
| 1279 | |
| 1280 | static void |
| 1281 | pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, |
| 1282 | struct pnfs_layout_segment *lseg, |
| 1283 | struct list_head *free_me) |
| 1284 | { |
| 1285 | struct inode *inode = lo->plh_inode; |
| 1286 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; |
| 1287 | |
| 1288 | if (ld->add_lseg != NULL) |
| 1289 | ld->add_lseg(lo, lseg, free_me); |
| 1290 | else |
| 1291 | pnfs_generic_layout_insert_lseg(lo, lseg, |
| 1292 | pnfs_lseg_range_is_after, |
| 1293 | pnfs_lseg_no_merge, |
| 1294 | free_me); |
| 1295 | } |
| 1296 | |
| 1297 | static struct pnfs_layout_hdr * |
| 1298 | alloc_init_layout_hdr(struct inode *ino, |
| 1299 | struct nfs_open_context *ctx, |
| 1300 | gfp_t gfp_flags) |
| 1301 | { |
| 1302 | struct pnfs_layout_hdr *lo; |
| 1303 | |
| 1304 | lo = pnfs_alloc_layout_hdr(ino, gfp_flags); |
| 1305 | if (!lo) |
| 1306 | return NULL; |
| 1307 | atomic_set(&lo->plh_refcount, 1); |
| 1308 | INIT_LIST_HEAD(&lo->plh_layouts); |
| 1309 | INIT_LIST_HEAD(&lo->plh_segs); |
| 1310 | INIT_LIST_HEAD(&lo->plh_bulk_destroy); |
| 1311 | lo->plh_inode = ino; |
| 1312 | lo->plh_lc_cred = get_rpccred(ctx->cred); |
| 1313 | return lo; |
| 1314 | } |
| 1315 | |
| 1316 | static struct pnfs_layout_hdr * |
| 1317 | pnfs_find_alloc_layout(struct inode *ino, |
| 1318 | struct nfs_open_context *ctx, |
| 1319 | gfp_t gfp_flags) |
| 1320 | { |
| 1321 | struct nfs_inode *nfsi = NFS_I(ino); |
| 1322 | struct pnfs_layout_hdr *new = NULL; |
| 1323 | |
| 1324 | dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); |
| 1325 | |
| 1326 | if (nfsi->layout != NULL) |
| 1327 | goto out_existing; |
| 1328 | spin_unlock(&ino->i_lock); |
| 1329 | new = alloc_init_layout_hdr(ino, ctx, gfp_flags); |
| 1330 | spin_lock(&ino->i_lock); |
| 1331 | |
| 1332 | if (likely(nfsi->layout == NULL)) { /* Won the race? */ |
| 1333 | nfsi->layout = new; |
| 1334 | return new; |
| 1335 | } else if (new != NULL) |
| 1336 | pnfs_free_layout_hdr(new); |
| 1337 | out_existing: |
| 1338 | pnfs_get_layout_hdr(nfsi->layout); |
| 1339 | return nfsi->layout; |
| 1340 | } |
| 1341 | |
| 1342 | /* |
| 1343 | * iomode matching rules: |
| 1344 | * iomode lseg match |
| 1345 | * ----- ----- ----- |
| 1346 | * ANY READ true |
| 1347 | * ANY RW true |
| 1348 | * RW READ false |
| 1349 | * RW RW true |
| 1350 | * READ READ true |
| 1351 | * READ RW true |
| 1352 | */ |
| 1353 | static bool |
| 1354 | pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, |
| 1355 | const struct pnfs_layout_range *range) |
| 1356 | { |
| 1357 | struct pnfs_layout_range range1; |
| 1358 | |
| 1359 | if ((range->iomode == IOMODE_RW && |
| 1360 | ls_range->iomode != IOMODE_RW) || |
| 1361 | !pnfs_lseg_range_intersecting(ls_range, range)) |
| 1362 | return 0; |
| 1363 | |
| 1364 | /* range1 covers only the first byte in the range */ |
| 1365 | range1 = *range; |
| 1366 | range1.length = 1; |
| 1367 | return pnfs_lseg_range_contained(ls_range, &range1); |
| 1368 | } |
| 1369 | |
| 1370 | /* |
| 1371 | * lookup range in layout |
| 1372 | */ |
| 1373 | static struct pnfs_layout_segment * |
| 1374 | pnfs_find_lseg(struct pnfs_layout_hdr *lo, |
| 1375 | struct pnfs_layout_range *range) |
| 1376 | { |
| 1377 | struct pnfs_layout_segment *lseg, *ret = NULL; |
| 1378 | |
| 1379 | dprintk("%s:Begin\n", __func__); |
| 1380 | |
| 1381 | list_for_each_entry(lseg, &lo->plh_segs, pls_list) { |
| 1382 | if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && |
| 1383 | !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && |
| 1384 | pnfs_lseg_range_match(&lseg->pls_range, range)) { |
| 1385 | ret = pnfs_get_lseg(lseg); |
| 1386 | break; |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | dprintk("%s:Return lseg %p ref %d\n", |
| 1391 | __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); |
| 1392 | return ret; |
| 1393 | } |
| 1394 | |
| 1395 | /* |
| 1396 | * Use mdsthreshold hints set at each OPEN to determine if I/O should go |
| 1397 | * to the MDS or over pNFS |
| 1398 | * |
| 1399 | * The nfs_inode read_io and write_io fields are cumulative counters reset |
| 1400 | * when there are no layout segments. Note that in pnfs_update_layout iomode |
| 1401 | * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a |
| 1402 | * WRITE request. |
| 1403 | * |
| 1404 | * A return of true means use MDS I/O. |
| 1405 | * |
| 1406 | * From rfc 5661: |
| 1407 | * If a file's size is smaller than the file size threshold, data accesses |
| 1408 | * SHOULD be sent to the metadata server. If an I/O request has a length that |
| 1409 | * is below the I/O size threshold, the I/O SHOULD be sent to the metadata |
| 1410 | * server. If both file size and I/O size are provided, the client SHOULD |
| 1411 | * reach or exceed both thresholds before sending its read or write |
| 1412 | * requests to the data server. |
| 1413 | */ |
| 1414 | static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, |
| 1415 | struct inode *ino, int iomode) |
| 1416 | { |
| 1417 | struct nfs4_threshold *t = ctx->mdsthreshold; |
| 1418 | struct nfs_inode *nfsi = NFS_I(ino); |
| 1419 | loff_t fsize = i_size_read(ino); |
| 1420 | bool size = false, size_set = false, io = false, io_set = false, ret = false; |
| 1421 | |
| 1422 | if (t == NULL) |
| 1423 | return ret; |
| 1424 | |
| 1425 | dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", |
| 1426 | __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); |
| 1427 | |
| 1428 | switch (iomode) { |
| 1429 | case IOMODE_READ: |
| 1430 | if (t->bm & THRESHOLD_RD) { |
| 1431 | dprintk("%s fsize %llu\n", __func__, fsize); |
| 1432 | size_set = true; |
| 1433 | if (fsize < t->rd_sz) |
| 1434 | size = true; |
| 1435 | } |
| 1436 | if (t->bm & THRESHOLD_RD_IO) { |
| 1437 | dprintk("%s nfsi->read_io %llu\n", __func__, |
| 1438 | nfsi->read_io); |
| 1439 | io_set = true; |
| 1440 | if (nfsi->read_io < t->rd_io_sz) |
| 1441 | io = true; |
| 1442 | } |
| 1443 | break; |
| 1444 | case IOMODE_RW: |
| 1445 | if (t->bm & THRESHOLD_WR) { |
| 1446 | dprintk("%s fsize %llu\n", __func__, fsize); |
| 1447 | size_set = true; |
| 1448 | if (fsize < t->wr_sz) |
| 1449 | size = true; |
| 1450 | } |
| 1451 | if (t->bm & THRESHOLD_WR_IO) { |
| 1452 | dprintk("%s nfsi->write_io %llu\n", __func__, |
| 1453 | nfsi->write_io); |
| 1454 | io_set = true; |
| 1455 | if (nfsi->write_io < t->wr_io_sz) |
| 1456 | io = true; |
| 1457 | } |
| 1458 | break; |
| 1459 | } |
| 1460 | if (size_set && io_set) { |
| 1461 | if (size && io) |
| 1462 | ret = true; |
| 1463 | } else if (size || io) |
| 1464 | ret = true; |
| 1465 | |
| 1466 | dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); |
| 1467 | return ret; |
| 1468 | } |
| 1469 | |
| 1470 | static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) |
| 1471 | { |
| 1472 | /* |
| 1473 | * send layoutcommit as it can hold up layoutreturn due to lseg |
| 1474 | * reference |
| 1475 | */ |
| 1476 | pnfs_layoutcommit_inode(lo->plh_inode, false); |
| 1477 | return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, |
| 1478 | nfs_wait_bit_killable, |
| 1479 | TASK_UNINTERRUPTIBLE); |
| 1480 | } |
| 1481 | |
| 1482 | static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) |
| 1483 | { |
| 1484 | unsigned long *bitlock = &lo->plh_flags; |
| 1485 | |
| 1486 | clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); |
| 1487 | smp_mb__after_atomic(); |
| 1488 | wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); |
| 1489 | } |
| 1490 | |
| 1491 | /* |
| 1492 | * Layout segment is retreived from the server if not cached. |
| 1493 | * The appropriate layout segment is referenced and returned to the caller. |
| 1494 | */ |
| 1495 | struct pnfs_layout_segment * |
| 1496 | pnfs_update_layout(struct inode *ino, |
| 1497 | struct nfs_open_context *ctx, |
| 1498 | loff_t pos, |
| 1499 | u64 count, |
| 1500 | enum pnfs_iomode iomode, |
| 1501 | gfp_t gfp_flags) |
| 1502 | { |
| 1503 | struct pnfs_layout_range arg = { |
| 1504 | .iomode = iomode, |
| 1505 | .offset = pos, |
| 1506 | .length = count, |
| 1507 | }; |
| 1508 | unsigned pg_offset; |
| 1509 | struct nfs_server *server = NFS_SERVER(ino); |
| 1510 | struct nfs_client *clp = server->nfs_client; |
| 1511 | struct pnfs_layout_hdr *lo; |
| 1512 | struct pnfs_layout_segment *lseg = NULL; |
| 1513 | bool first; |
| 1514 | |
| 1515 | if (!pnfs_enabled_sb(NFS_SERVER(ino))) { |
| 1516 | trace_pnfs_update_layout(ino, pos, count, iomode, NULL, |
| 1517 | PNFS_UPDATE_LAYOUT_NO_PNFS); |
| 1518 | goto out; |
| 1519 | } |
| 1520 | |
| 1521 | if (iomode == IOMODE_READ && i_size_read(ino) == 0) { |
| 1522 | trace_pnfs_update_layout(ino, pos, count, iomode, NULL, |
| 1523 | PNFS_UPDATE_LAYOUT_RD_ZEROLEN); |
| 1524 | goto out; |
| 1525 | } |
| 1526 | |
| 1527 | if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { |
| 1528 | trace_pnfs_update_layout(ino, pos, count, iomode, NULL, |
| 1529 | PNFS_UPDATE_LAYOUT_MDSTHRESH); |
| 1530 | goto out; |
| 1531 | } |
| 1532 | |
| 1533 | lookup_again: |
| 1534 | first = false; |
| 1535 | spin_lock(&ino->i_lock); |
| 1536 | lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); |
| 1537 | if (lo == NULL) { |
| 1538 | spin_unlock(&ino->i_lock); |
| 1539 | trace_pnfs_update_layout(ino, pos, count, iomode, NULL, |
| 1540 | PNFS_UPDATE_LAYOUT_NOMEM); |
| 1541 | goto out; |
| 1542 | } |
| 1543 | |
| 1544 | /* Do we even need to bother with this? */ |
| 1545 | if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
| 1546 | trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| 1547 | PNFS_UPDATE_LAYOUT_BULK_RECALL); |
| 1548 | dprintk("%s matches recall, use MDS\n", __func__); |
| 1549 | goto out_unlock; |
| 1550 | } |
| 1551 | |
| 1552 | /* if LAYOUTGET already failed once we don't try again */ |
| 1553 | if (pnfs_layout_io_test_failed(lo, iomode)) { |
| 1554 | trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| 1555 | PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); |
| 1556 | goto out_unlock; |
| 1557 | } |
| 1558 | |
| 1559 | first = list_empty(&lo->plh_segs); |
| 1560 | if (first) { |
| 1561 | /* The first layoutget for the file. Need to serialize per |
| 1562 | * RFC 5661 Errata 3208. |
| 1563 | */ |
| 1564 | if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, |
| 1565 | &lo->plh_flags)) { |
| 1566 | spin_unlock(&ino->i_lock); |
| 1567 | wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET, |
| 1568 | TASK_UNINTERRUPTIBLE); |
| 1569 | pnfs_put_layout_hdr(lo); |
| 1570 | goto lookup_again; |
| 1571 | } |
| 1572 | } else { |
| 1573 | /* Check to see if the layout for the given range |
| 1574 | * already exists |
| 1575 | */ |
| 1576 | lseg = pnfs_find_lseg(lo, &arg); |
| 1577 | if (lseg) { |
| 1578 | trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| 1579 | PNFS_UPDATE_LAYOUT_FOUND_CACHED); |
| 1580 | goto out_unlock; |
| 1581 | } |
| 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * Because we free lsegs before sending LAYOUTRETURN, we need to wait |
| 1586 | * for LAYOUTRETURN even if first is true. |
| 1587 | */ |
| 1588 | if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { |
| 1589 | spin_unlock(&ino->i_lock); |
| 1590 | dprintk("%s wait for layoutreturn\n", __func__); |
| 1591 | if (pnfs_prepare_to_retry_layoutget(lo)) { |
| 1592 | if (first) |
| 1593 | pnfs_clear_first_layoutget(lo); |
| 1594 | pnfs_put_layout_hdr(lo); |
| 1595 | dprintk("%s retrying\n", __func__); |
| 1596 | goto lookup_again; |
| 1597 | } |
| 1598 | trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| 1599 | PNFS_UPDATE_LAYOUT_RETURN); |
| 1600 | goto out_put_layout_hdr; |
| 1601 | } |
| 1602 | |
| 1603 | if (pnfs_layoutgets_blocked(lo)) { |
| 1604 | trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| 1605 | PNFS_UPDATE_LAYOUT_BLOCKED); |
| 1606 | goto out_unlock; |
| 1607 | } |
| 1608 | atomic_inc(&lo->plh_outstanding); |
| 1609 | spin_unlock(&ino->i_lock); |
| 1610 | |
| 1611 | if (list_empty(&lo->plh_layouts)) { |
| 1612 | /* The lo must be on the clp list if there is any |
| 1613 | * chance of a CB_LAYOUTRECALL(FILE) coming in. |
| 1614 | */ |
| 1615 | spin_lock(&clp->cl_lock); |
| 1616 | if (list_empty(&lo->plh_layouts)) |
| 1617 | list_add_tail(&lo->plh_layouts, &server->layouts); |
| 1618 | spin_unlock(&clp->cl_lock); |
| 1619 | } |
| 1620 | |
| 1621 | pg_offset = arg.offset & ~PAGE_CACHE_MASK; |
| 1622 | if (pg_offset) { |
| 1623 | arg.offset -= pg_offset; |
| 1624 | arg.length += pg_offset; |
| 1625 | } |
| 1626 | if (arg.length != NFS4_MAX_UINT64) |
| 1627 | arg.length = PAGE_CACHE_ALIGN(arg.length); |
| 1628 | |
| 1629 | lseg = send_layoutget(lo, ctx, &arg, gfp_flags); |
| 1630 | atomic_dec(&lo->plh_outstanding); |
| 1631 | trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| 1632 | PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); |
| 1633 | out_put_layout_hdr: |
| 1634 | if (first) |
| 1635 | pnfs_clear_first_layoutget(lo); |
| 1636 | pnfs_put_layout_hdr(lo); |
| 1637 | out: |
| 1638 | dprintk("%s: inode %s/%llu pNFS layout segment %s for " |
| 1639 | "(%s, offset: %llu, length: %llu)\n", |
| 1640 | __func__, ino->i_sb->s_id, |
| 1641 | (unsigned long long)NFS_FILEID(ino), |
| 1642 | IS_ERR_OR_NULL(lseg) ? "not found" : "found", |
| 1643 | iomode==IOMODE_RW ? "read/write" : "read-only", |
| 1644 | (unsigned long long)pos, |
| 1645 | (unsigned long long)count); |
| 1646 | return lseg; |
| 1647 | out_unlock: |
| 1648 | spin_unlock(&ino->i_lock); |
| 1649 | goto out_put_layout_hdr; |
| 1650 | } |
| 1651 | EXPORT_SYMBOL_GPL(pnfs_update_layout); |
| 1652 | |
| 1653 | static bool |
| 1654 | pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) |
| 1655 | { |
| 1656 | switch (range->iomode) { |
| 1657 | case IOMODE_READ: |
| 1658 | case IOMODE_RW: |
| 1659 | break; |
| 1660 | default: |
| 1661 | return false; |
| 1662 | } |
| 1663 | if (range->offset == NFS4_MAX_UINT64) |
| 1664 | return false; |
| 1665 | if (range->length == 0) |
| 1666 | return false; |
| 1667 | if (range->length != NFS4_MAX_UINT64 && |
| 1668 | range->length > NFS4_MAX_UINT64 - range->offset) |
| 1669 | return false; |
| 1670 | return true; |
| 1671 | } |
| 1672 | |
| 1673 | struct pnfs_layout_segment * |
| 1674 | pnfs_layout_process(struct nfs4_layoutget *lgp) |
| 1675 | { |
| 1676 | struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; |
| 1677 | struct nfs4_layoutget_res *res = &lgp->res; |
| 1678 | struct pnfs_layout_segment *lseg; |
| 1679 | struct inode *ino = lo->plh_inode; |
| 1680 | LIST_HEAD(free_me); |
| 1681 | int status = -EINVAL; |
| 1682 | |
| 1683 | if (!pnfs_sanity_check_layout_range(&res->range)) |
| 1684 | goto out; |
| 1685 | |
| 1686 | /* Inject layout blob into I/O device driver */ |
| 1687 | lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); |
| 1688 | if (!lseg || IS_ERR(lseg)) { |
| 1689 | if (!lseg) |
| 1690 | status = -ENOMEM; |
| 1691 | else |
| 1692 | status = PTR_ERR(lseg); |
| 1693 | dprintk("%s: Could not allocate layout: error %d\n", |
| 1694 | __func__, status); |
| 1695 | goto out; |
| 1696 | } |
| 1697 | |
| 1698 | init_lseg(lo, lseg); |
| 1699 | lseg->pls_range = res->range; |
| 1700 | |
| 1701 | spin_lock(&ino->i_lock); |
| 1702 | if (pnfs_layoutgets_blocked(lo)) { |
| 1703 | dprintk("%s forget reply due to state\n", __func__); |
| 1704 | goto out_forget_reply; |
| 1705 | } |
| 1706 | |
| 1707 | if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { |
| 1708 | /* existing state ID, make sure the sequence number matches. */ |
| 1709 | if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { |
| 1710 | dprintk("%s forget reply due to sequence\n", __func__); |
| 1711 | status = -EAGAIN; |
| 1712 | goto out_forget_reply; |
| 1713 | } |
| 1714 | pnfs_set_layout_stateid(lo, &res->stateid, false); |
| 1715 | } else { |
| 1716 | /* |
| 1717 | * We got an entirely new state ID. Mark all segments for the |
| 1718 | * inode invalid, and don't bother validating the stateid |
| 1719 | * sequence number. |
| 1720 | */ |
| 1721 | pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL); |
| 1722 | |
| 1723 | nfs4_stateid_copy(&lo->plh_stateid, &res->stateid); |
| 1724 | lo->plh_barrier = be32_to_cpu(res->stateid.seqid); |
| 1725 | } |
| 1726 | |
| 1727 | clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); |
| 1728 | |
| 1729 | pnfs_get_lseg(lseg); |
| 1730 | pnfs_layout_insert_lseg(lo, lseg, &free_me); |
| 1731 | |
| 1732 | if (res->return_on_close) |
| 1733 | set_bit(NFS_LSEG_ROC, &lseg->pls_flags); |
| 1734 | |
| 1735 | spin_unlock(&ino->i_lock); |
| 1736 | pnfs_free_lseg_list(&free_me); |
| 1737 | return lseg; |
| 1738 | out: |
| 1739 | return ERR_PTR(status); |
| 1740 | |
| 1741 | out_forget_reply: |
| 1742 | spin_unlock(&ino->i_lock); |
| 1743 | lseg->pls_layout = lo; |
| 1744 | NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
| 1745 | goto out; |
| 1746 | } |
| 1747 | |
| 1748 | static void |
| 1749 | pnfs_set_plh_return_iomode(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode) |
| 1750 | { |
| 1751 | if (lo->plh_return_iomode == iomode) |
| 1752 | return; |
| 1753 | if (lo->plh_return_iomode != 0) |
| 1754 | iomode = IOMODE_ANY; |
| 1755 | lo->plh_return_iomode = iomode; |
| 1756 | set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); |
| 1757 | } |
| 1758 | |
| 1759 | /** |
| 1760 | * pnfs_mark_matching_lsegs_return - Free or return matching layout segments |
| 1761 | * @lo: pointer to layout header |
| 1762 | * @tmp_list: list header to be used with pnfs_free_lseg_list() |
| 1763 | * @return_range: describe layout segment ranges to be returned |
| 1764 | * |
| 1765 | * This function is mainly intended for use by layoutrecall. It attempts |
| 1766 | * to free the layout segment immediately, or else to mark it for return |
| 1767 | * as soon as its reference count drops to zero. |
| 1768 | */ |
| 1769 | int |
| 1770 | pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, |
| 1771 | struct list_head *tmp_list, |
| 1772 | const struct pnfs_layout_range *return_range) |
| 1773 | { |
| 1774 | struct pnfs_layout_segment *lseg, *next; |
| 1775 | int remaining = 0; |
| 1776 | |
| 1777 | dprintk("%s:Begin lo %p\n", __func__, lo); |
| 1778 | |
| 1779 | if (list_empty(&lo->plh_segs)) |
| 1780 | return 0; |
| 1781 | |
| 1782 | assert_spin_locked(&lo->plh_inode->i_lock); |
| 1783 | |
| 1784 | list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
| 1785 | if (should_free_lseg(&lseg->pls_range, return_range)) { |
| 1786 | dprintk("%s: marking lseg %p iomode %d " |
| 1787 | "offset %llu length %llu\n", __func__, |
| 1788 | lseg, lseg->pls_range.iomode, |
| 1789 | lseg->pls_range.offset, |
| 1790 | lseg->pls_range.length); |
| 1791 | if (mark_lseg_invalid(lseg, tmp_list)) |
| 1792 | continue; |
| 1793 | remaining++; |
| 1794 | set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); |
| 1795 | pnfs_set_plh_return_iomode(lo, return_range->iomode); |
| 1796 | } |
| 1797 | return remaining; |
| 1798 | } |
| 1799 | |
| 1800 | void pnfs_error_mark_layout_for_return(struct inode *inode, |
| 1801 | struct pnfs_layout_segment *lseg) |
| 1802 | { |
| 1803 | struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; |
| 1804 | struct pnfs_layout_range range = { |
| 1805 | .iomode = lseg->pls_range.iomode, |
| 1806 | .offset = 0, |
| 1807 | .length = NFS4_MAX_UINT64, |
| 1808 | }; |
| 1809 | LIST_HEAD(free_me); |
| 1810 | bool return_now = false; |
| 1811 | |
| 1812 | spin_lock(&inode->i_lock); |
| 1813 | pnfs_set_plh_return_iomode(lo, range.iomode); |
| 1814 | /* |
| 1815 | * mark all matching lsegs so that we are sure to have no live |
| 1816 | * segments at hand when sending layoutreturn. See pnfs_put_lseg() |
| 1817 | * for how it works. |
| 1818 | */ |
| 1819 | if (!pnfs_mark_matching_lsegs_return(lo, &free_me, &range)) { |
| 1820 | nfs4_stateid stateid; |
| 1821 | enum pnfs_iomode iomode = lo->plh_return_iomode; |
| 1822 | |
| 1823 | nfs4_stateid_copy(&stateid, &lo->plh_stateid); |
| 1824 | return_now = pnfs_prepare_layoutreturn(lo); |
| 1825 | spin_unlock(&inode->i_lock); |
| 1826 | if (return_now) |
| 1827 | pnfs_send_layoutreturn(lo, &stateid, iomode, false); |
| 1828 | } else { |
| 1829 | spin_unlock(&inode->i_lock); |
| 1830 | nfs_commit_inode(inode, 0); |
| 1831 | } |
| 1832 | pnfs_free_lseg_list(&free_me); |
| 1833 | } |
| 1834 | EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); |
| 1835 | |
| 1836 | void |
| 1837 | pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| 1838 | { |
| 1839 | u64 rd_size = req->wb_bytes; |
| 1840 | |
| 1841 | if (pgio->pg_lseg == NULL) { |
| 1842 | if (pgio->pg_dreq == NULL) |
| 1843 | rd_size = i_size_read(pgio->pg_inode) - req_offset(req); |
| 1844 | else |
| 1845 | rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); |
| 1846 | |
| 1847 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
| 1848 | req->wb_context, |
| 1849 | req_offset(req), |
| 1850 | rd_size, |
| 1851 | IOMODE_READ, |
| 1852 | GFP_KERNEL); |
| 1853 | if (IS_ERR(pgio->pg_lseg)) { |
| 1854 | pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
| 1855 | pgio->pg_lseg = NULL; |
| 1856 | return; |
| 1857 | } |
| 1858 | } |
| 1859 | /* If no lseg, fall back to read through mds */ |
| 1860 | if (pgio->pg_lseg == NULL) |
| 1861 | nfs_pageio_reset_read_mds(pgio); |
| 1862 | |
| 1863 | } |
| 1864 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); |
| 1865 | |
| 1866 | void |
| 1867 | pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, |
| 1868 | struct nfs_page *req, u64 wb_size) |
| 1869 | { |
| 1870 | if (pgio->pg_lseg == NULL) { |
| 1871 | pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
| 1872 | req->wb_context, |
| 1873 | req_offset(req), |
| 1874 | wb_size, |
| 1875 | IOMODE_RW, |
| 1876 | GFP_NOFS); |
| 1877 | if (IS_ERR(pgio->pg_lseg)) { |
| 1878 | pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
| 1879 | pgio->pg_lseg = NULL; |
| 1880 | return; |
| 1881 | } |
| 1882 | } |
| 1883 | /* If no lseg, fall back to write through mds */ |
| 1884 | if (pgio->pg_lseg == NULL) |
| 1885 | nfs_pageio_reset_write_mds(pgio); |
| 1886 | } |
| 1887 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); |
| 1888 | |
| 1889 | void |
| 1890 | pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) |
| 1891 | { |
| 1892 | if (desc->pg_lseg) { |
| 1893 | pnfs_put_lseg(desc->pg_lseg); |
| 1894 | desc->pg_lseg = NULL; |
| 1895 | } |
| 1896 | } |
| 1897 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); |
| 1898 | |
| 1899 | /* |
| 1900 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| 1901 | * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| 1902 | */ |
| 1903 | size_t |
| 1904 | pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, |
| 1905 | struct nfs_page *prev, struct nfs_page *req) |
| 1906 | { |
| 1907 | unsigned int size; |
| 1908 | u64 seg_end, req_start, seg_left; |
| 1909 | |
| 1910 | size = nfs_generic_pg_test(pgio, prev, req); |
| 1911 | if (!size) |
| 1912 | return 0; |
| 1913 | |
| 1914 | /* |
| 1915 | * 'size' contains the number of bytes left in the current page (up |
| 1916 | * to the original size asked for in @req->wb_bytes). |
| 1917 | * |
| 1918 | * Calculate how many bytes are left in the layout segment |
| 1919 | * and if there are less bytes than 'size', return that instead. |
| 1920 | * |
| 1921 | * Please also note that 'end_offset' is actually the offset of the |
| 1922 | * first byte that lies outside the pnfs_layout_range. FIXME? |
| 1923 | * |
| 1924 | */ |
| 1925 | if (pgio->pg_lseg) { |
| 1926 | seg_end = end_offset(pgio->pg_lseg->pls_range.offset, |
| 1927 | pgio->pg_lseg->pls_range.length); |
| 1928 | req_start = req_offset(req); |
| 1929 | WARN_ON_ONCE(req_start >= seg_end); |
| 1930 | /* start of request is past the last byte of this segment */ |
| 1931 | if (req_start >= seg_end) { |
| 1932 | /* reference the new lseg */ |
| 1933 | if (pgio->pg_ops->pg_cleanup) |
| 1934 | pgio->pg_ops->pg_cleanup(pgio); |
| 1935 | if (pgio->pg_ops->pg_init) |
| 1936 | pgio->pg_ops->pg_init(pgio, req); |
| 1937 | return 0; |
| 1938 | } |
| 1939 | |
| 1940 | /* adjust 'size' iff there are fewer bytes left in the |
| 1941 | * segment than what nfs_generic_pg_test returned */ |
| 1942 | seg_left = seg_end - req_start; |
| 1943 | if (seg_left < size) |
| 1944 | size = (unsigned int)seg_left; |
| 1945 | } |
| 1946 | |
| 1947 | return size; |
| 1948 | } |
| 1949 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); |
| 1950 | |
| 1951 | int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) |
| 1952 | { |
| 1953 | struct nfs_pageio_descriptor pgio; |
| 1954 | |
| 1955 | /* Resend all requests through the MDS */ |
| 1956 | nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, |
| 1957 | hdr->completion_ops); |
| 1958 | set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); |
| 1959 | return nfs_pageio_resend(&pgio, hdr); |
| 1960 | } |
| 1961 | EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); |
| 1962 | |
| 1963 | static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) |
| 1964 | { |
| 1965 | |
| 1966 | dprintk("pnfs write error = %d\n", hdr->pnfs_error); |
| 1967 | if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & |
| 1968 | PNFS_LAYOUTRET_ON_ERROR) { |
| 1969 | pnfs_return_layout(hdr->inode); |
| 1970 | } |
| 1971 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
| 1972 | hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); |
| 1973 | } |
| 1974 | |
| 1975 | /* |
| 1976 | * Called by non rpc-based layout drivers |
| 1977 | */ |
| 1978 | void pnfs_ld_write_done(struct nfs_pgio_header *hdr) |
| 1979 | { |
| 1980 | if (likely(!hdr->pnfs_error)) { |
| 1981 | pnfs_set_layoutcommit(hdr->inode, hdr->lseg, |
| 1982 | hdr->mds_offset + hdr->res.count); |
| 1983 | hdr->mds_ops->rpc_call_done(&hdr->task, hdr); |
| 1984 | } |
| 1985 | trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); |
| 1986 | if (unlikely(hdr->pnfs_error)) |
| 1987 | pnfs_ld_handle_write_error(hdr); |
| 1988 | hdr->mds_ops->rpc_release(hdr); |
| 1989 | } |
| 1990 | EXPORT_SYMBOL_GPL(pnfs_ld_write_done); |
| 1991 | |
| 1992 | static void |
| 1993 | pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, |
| 1994 | struct nfs_pgio_header *hdr) |
| 1995 | { |
| 1996 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
| 1997 | |
| 1998 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
| 1999 | list_splice_tail_init(&hdr->pages, &mirror->pg_list); |
| 2000 | nfs_pageio_reset_write_mds(desc); |
| 2001 | mirror->pg_recoalesce = 1; |
| 2002 | } |
| 2003 | nfs_pgio_data_destroy(hdr); |
| 2004 | hdr->release(hdr); |
| 2005 | } |
| 2006 | |
| 2007 | static enum pnfs_try_status |
| 2008 | pnfs_try_to_write_data(struct nfs_pgio_header *hdr, |
| 2009 | const struct rpc_call_ops *call_ops, |
| 2010 | struct pnfs_layout_segment *lseg, |
| 2011 | int how) |
| 2012 | { |
| 2013 | struct inode *inode = hdr->inode; |
| 2014 | enum pnfs_try_status trypnfs; |
| 2015 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 2016 | |
| 2017 | hdr->mds_ops = call_ops; |
| 2018 | |
| 2019 | dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, |
| 2020 | inode->i_ino, hdr->args.count, hdr->args.offset, how); |
| 2021 | trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); |
| 2022 | if (trypnfs != PNFS_NOT_ATTEMPTED) |
| 2023 | nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); |
| 2024 | dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
| 2025 | return trypnfs; |
| 2026 | } |
| 2027 | |
| 2028 | static void |
| 2029 | pnfs_do_write(struct nfs_pageio_descriptor *desc, |
| 2030 | struct nfs_pgio_header *hdr, int how) |
| 2031 | { |
| 2032 | const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; |
| 2033 | struct pnfs_layout_segment *lseg = desc->pg_lseg; |
| 2034 | enum pnfs_try_status trypnfs; |
| 2035 | |
| 2036 | trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); |
| 2037 | if (trypnfs == PNFS_NOT_ATTEMPTED) |
| 2038 | pnfs_write_through_mds(desc, hdr); |
| 2039 | } |
| 2040 | |
| 2041 | static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) |
| 2042 | { |
| 2043 | pnfs_put_lseg(hdr->lseg); |
| 2044 | nfs_pgio_header_free(hdr); |
| 2045 | } |
| 2046 | |
| 2047 | int |
| 2048 | pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) |
| 2049 | { |
| 2050 | struct nfs_pgio_header *hdr; |
| 2051 | int ret; |
| 2052 | |
| 2053 | hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); |
| 2054 | if (!hdr) { |
| 2055 | desc->pg_error = -ENOMEM; |
| 2056 | return desc->pg_error; |
| 2057 | } |
| 2058 | nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); |
| 2059 | |
| 2060 | hdr->lseg = pnfs_get_lseg(desc->pg_lseg); |
| 2061 | ret = nfs_generic_pgio(desc, hdr); |
| 2062 | if (!ret) |
| 2063 | pnfs_do_write(desc, hdr, desc->pg_ioflags); |
| 2064 | |
| 2065 | return ret; |
| 2066 | } |
| 2067 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); |
| 2068 | |
| 2069 | int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) |
| 2070 | { |
| 2071 | struct nfs_pageio_descriptor pgio; |
| 2072 | |
| 2073 | /* Resend all requests through the MDS */ |
| 2074 | nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); |
| 2075 | return nfs_pageio_resend(&pgio, hdr); |
| 2076 | } |
| 2077 | EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); |
| 2078 | |
| 2079 | static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) |
| 2080 | { |
| 2081 | dprintk("pnfs read error = %d\n", hdr->pnfs_error); |
| 2082 | if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & |
| 2083 | PNFS_LAYOUTRET_ON_ERROR) { |
| 2084 | pnfs_return_layout(hdr->inode); |
| 2085 | } |
| 2086 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
| 2087 | hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); |
| 2088 | } |
| 2089 | |
| 2090 | /* |
| 2091 | * Called by non rpc-based layout drivers |
| 2092 | */ |
| 2093 | void pnfs_ld_read_done(struct nfs_pgio_header *hdr) |
| 2094 | { |
| 2095 | if (likely(!hdr->pnfs_error)) { |
| 2096 | __nfs4_read_done_cb(hdr); |
| 2097 | hdr->mds_ops->rpc_call_done(&hdr->task, hdr); |
| 2098 | } |
| 2099 | trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); |
| 2100 | if (unlikely(hdr->pnfs_error)) |
| 2101 | pnfs_ld_handle_read_error(hdr); |
| 2102 | hdr->mds_ops->rpc_release(hdr); |
| 2103 | } |
| 2104 | EXPORT_SYMBOL_GPL(pnfs_ld_read_done); |
| 2105 | |
| 2106 | static void |
| 2107 | pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, |
| 2108 | struct nfs_pgio_header *hdr) |
| 2109 | { |
| 2110 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
| 2111 | |
| 2112 | if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
| 2113 | list_splice_tail_init(&hdr->pages, &mirror->pg_list); |
| 2114 | nfs_pageio_reset_read_mds(desc); |
| 2115 | mirror->pg_recoalesce = 1; |
| 2116 | } |
| 2117 | nfs_pgio_data_destroy(hdr); |
| 2118 | hdr->release(hdr); |
| 2119 | } |
| 2120 | |
| 2121 | /* |
| 2122 | * Call the appropriate parallel I/O subsystem read function. |
| 2123 | */ |
| 2124 | static enum pnfs_try_status |
| 2125 | pnfs_try_to_read_data(struct nfs_pgio_header *hdr, |
| 2126 | const struct rpc_call_ops *call_ops, |
| 2127 | struct pnfs_layout_segment *lseg) |
| 2128 | { |
| 2129 | struct inode *inode = hdr->inode; |
| 2130 | struct nfs_server *nfss = NFS_SERVER(inode); |
| 2131 | enum pnfs_try_status trypnfs; |
| 2132 | |
| 2133 | hdr->mds_ops = call_ops; |
| 2134 | |
| 2135 | dprintk("%s: Reading ino:%lu %u@%llu\n", |
| 2136 | __func__, inode->i_ino, hdr->args.count, hdr->args.offset); |
| 2137 | |
| 2138 | trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); |
| 2139 | if (trypnfs != PNFS_NOT_ATTEMPTED) |
| 2140 | nfs_inc_stats(inode, NFSIOS_PNFS_READ); |
| 2141 | dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
| 2142 | return trypnfs; |
| 2143 | } |
| 2144 | |
| 2145 | /* Resend all requests through pnfs. */ |
| 2146 | int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) |
| 2147 | { |
| 2148 | struct nfs_pageio_descriptor pgio; |
| 2149 | |
| 2150 | nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops); |
| 2151 | return nfs_pageio_resend(&pgio, hdr); |
| 2152 | } |
| 2153 | EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); |
| 2154 | |
| 2155 | static void |
| 2156 | pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) |
| 2157 | { |
| 2158 | const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; |
| 2159 | struct pnfs_layout_segment *lseg = desc->pg_lseg; |
| 2160 | enum pnfs_try_status trypnfs; |
| 2161 | int err = 0; |
| 2162 | |
| 2163 | trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); |
| 2164 | if (trypnfs == PNFS_TRY_AGAIN) |
| 2165 | err = pnfs_read_resend_pnfs(hdr); |
| 2166 | if (trypnfs == PNFS_NOT_ATTEMPTED || err) |
| 2167 | pnfs_read_through_mds(desc, hdr); |
| 2168 | } |
| 2169 | |
| 2170 | static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) |
| 2171 | { |
| 2172 | pnfs_put_lseg(hdr->lseg); |
| 2173 | nfs_pgio_header_free(hdr); |
| 2174 | } |
| 2175 | |
| 2176 | int |
| 2177 | pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) |
| 2178 | { |
| 2179 | struct nfs_pgio_header *hdr; |
| 2180 | int ret; |
| 2181 | |
| 2182 | hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); |
| 2183 | if (!hdr) { |
| 2184 | desc->pg_error = -ENOMEM; |
| 2185 | return desc->pg_error; |
| 2186 | } |
| 2187 | nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); |
| 2188 | hdr->lseg = pnfs_get_lseg(desc->pg_lseg); |
| 2189 | ret = nfs_generic_pgio(desc, hdr); |
| 2190 | if (!ret) |
| 2191 | pnfs_do_read(desc, hdr); |
| 2192 | return ret; |
| 2193 | } |
| 2194 | EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); |
| 2195 | |
| 2196 | static void pnfs_clear_layoutcommitting(struct inode *inode) |
| 2197 | { |
| 2198 | unsigned long *bitlock = &NFS_I(inode)->flags; |
| 2199 | |
| 2200 | clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); |
| 2201 | smp_mb__after_atomic(); |
| 2202 | wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); |
| 2203 | } |
| 2204 | |
| 2205 | /* |
| 2206 | * There can be multiple RW segments. |
| 2207 | */ |
| 2208 | static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) |
| 2209 | { |
| 2210 | struct pnfs_layout_segment *lseg; |
| 2211 | |
| 2212 | list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { |
| 2213 | if (lseg->pls_range.iomode == IOMODE_RW && |
| 2214 | test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) |
| 2215 | list_add(&lseg->pls_lc_list, listp); |
| 2216 | } |
| 2217 | } |
| 2218 | |
| 2219 | static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) |
| 2220 | { |
| 2221 | struct pnfs_layout_segment *lseg, *tmp; |
| 2222 | |
| 2223 | /* Matched by references in pnfs_set_layoutcommit */ |
| 2224 | list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { |
| 2225 | list_del_init(&lseg->pls_lc_list); |
| 2226 | pnfs_put_lseg(lseg); |
| 2227 | } |
| 2228 | |
| 2229 | pnfs_clear_layoutcommitting(inode); |
| 2230 | } |
| 2231 | |
| 2232 | void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) |
| 2233 | { |
| 2234 | pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); |
| 2235 | } |
| 2236 | EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); |
| 2237 | |
| 2238 | void |
| 2239 | pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, |
| 2240 | loff_t end_pos) |
| 2241 | { |
| 2242 | struct nfs_inode *nfsi = NFS_I(inode); |
| 2243 | bool mark_as_dirty = false; |
| 2244 | |
| 2245 | spin_lock(&inode->i_lock); |
| 2246 | if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { |
| 2247 | nfsi->layout->plh_lwb = end_pos; |
| 2248 | mark_as_dirty = true; |
| 2249 | dprintk("%s: Set layoutcommit for inode %lu ", |
| 2250 | __func__, inode->i_ino); |
| 2251 | } else if (end_pos > nfsi->layout->plh_lwb) |
| 2252 | nfsi->layout->plh_lwb = end_pos; |
| 2253 | if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { |
| 2254 | /* references matched in nfs4_layoutcommit_release */ |
| 2255 | pnfs_get_lseg(lseg); |
| 2256 | } |
| 2257 | spin_unlock(&inode->i_lock); |
| 2258 | dprintk("%s: lseg %p end_pos %llu\n", |
| 2259 | __func__, lseg, nfsi->layout->plh_lwb); |
| 2260 | |
| 2261 | /* if pnfs_layoutcommit_inode() runs between inode locks, the next one |
| 2262 | * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ |
| 2263 | if (mark_as_dirty) |
| 2264 | mark_inode_dirty_sync(inode); |
| 2265 | } |
| 2266 | EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); |
| 2267 | |
| 2268 | void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) |
| 2269 | { |
| 2270 | struct nfs_server *nfss = NFS_SERVER(data->args.inode); |
| 2271 | |
| 2272 | if (nfss->pnfs_curr_ld->cleanup_layoutcommit) |
| 2273 | nfss->pnfs_curr_ld->cleanup_layoutcommit(data); |
| 2274 | pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); |
| 2275 | } |
| 2276 | |
| 2277 | /* |
| 2278 | * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and |
| 2279 | * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough |
| 2280 | * data to disk to allow the server to recover the data if it crashes. |
| 2281 | * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag |
| 2282 | * is off, and a COMMIT is sent to a data server, or |
| 2283 | * if WRITEs to a data server return NFS_DATA_SYNC. |
| 2284 | */ |
| 2285 | int |
| 2286 | pnfs_layoutcommit_inode(struct inode *inode, bool sync) |
| 2287 | { |
| 2288 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; |
| 2289 | struct nfs4_layoutcommit_data *data; |
| 2290 | struct nfs_inode *nfsi = NFS_I(inode); |
| 2291 | loff_t end_pos; |
| 2292 | int status; |
| 2293 | |
| 2294 | if (!pnfs_layoutcommit_outstanding(inode)) |
| 2295 | return 0; |
| 2296 | |
| 2297 | dprintk("--> %s inode %lu\n", __func__, inode->i_ino); |
| 2298 | |
| 2299 | status = -EAGAIN; |
| 2300 | if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { |
| 2301 | if (!sync) |
| 2302 | goto out; |
| 2303 | status = wait_on_bit_lock_action(&nfsi->flags, |
| 2304 | NFS_INO_LAYOUTCOMMITTING, |
| 2305 | nfs_wait_bit_killable, |
| 2306 | TASK_KILLABLE); |
| 2307 | if (status) |
| 2308 | goto out; |
| 2309 | } |
| 2310 | |
| 2311 | status = -ENOMEM; |
| 2312 | /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ |
| 2313 | data = kzalloc(sizeof(*data), GFP_NOFS); |
| 2314 | if (!data) |
| 2315 | goto clear_layoutcommitting; |
| 2316 | |
| 2317 | status = 0; |
| 2318 | spin_lock(&inode->i_lock); |
| 2319 | if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
| 2320 | goto out_unlock; |
| 2321 | |
| 2322 | INIT_LIST_HEAD(&data->lseg_list); |
| 2323 | pnfs_list_write_lseg(inode, &data->lseg_list); |
| 2324 | |
| 2325 | end_pos = nfsi->layout->plh_lwb; |
| 2326 | |
| 2327 | nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); |
| 2328 | spin_unlock(&inode->i_lock); |
| 2329 | |
| 2330 | data->args.inode = inode; |
| 2331 | data->cred = get_rpccred(nfsi->layout->plh_lc_cred); |
| 2332 | nfs_fattr_init(&data->fattr); |
| 2333 | data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; |
| 2334 | data->res.fattr = &data->fattr; |
| 2335 | data->args.lastbytewritten = end_pos - 1; |
| 2336 | data->res.server = NFS_SERVER(inode); |
| 2337 | |
| 2338 | if (ld->prepare_layoutcommit) { |
| 2339 | status = ld->prepare_layoutcommit(&data->args); |
| 2340 | if (status) { |
| 2341 | put_rpccred(data->cred); |
| 2342 | spin_lock(&inode->i_lock); |
| 2343 | set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); |
| 2344 | if (end_pos > nfsi->layout->plh_lwb) |
| 2345 | nfsi->layout->plh_lwb = end_pos; |
| 2346 | goto out_unlock; |
| 2347 | } |
| 2348 | } |
| 2349 | |
| 2350 | |
| 2351 | status = nfs4_proc_layoutcommit(data, sync); |
| 2352 | out: |
| 2353 | if (status) |
| 2354 | mark_inode_dirty_sync(inode); |
| 2355 | dprintk("<-- %s status %d\n", __func__, status); |
| 2356 | return status; |
| 2357 | out_unlock: |
| 2358 | spin_unlock(&inode->i_lock); |
| 2359 | kfree(data); |
| 2360 | clear_layoutcommitting: |
| 2361 | pnfs_clear_layoutcommitting(inode); |
| 2362 | goto out; |
| 2363 | } |
| 2364 | EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); |
| 2365 | |
| 2366 | int |
| 2367 | pnfs_generic_sync(struct inode *inode, bool datasync) |
| 2368 | { |
| 2369 | return pnfs_layoutcommit_inode(inode, true); |
| 2370 | } |
| 2371 | EXPORT_SYMBOL_GPL(pnfs_generic_sync); |
| 2372 | |
| 2373 | struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) |
| 2374 | { |
| 2375 | struct nfs4_threshold *thp; |
| 2376 | |
| 2377 | thp = kzalloc(sizeof(*thp), GFP_NOFS); |
| 2378 | if (!thp) { |
| 2379 | dprintk("%s mdsthreshold allocation failed\n", __func__); |
| 2380 | return NULL; |
| 2381 | } |
| 2382 | return thp; |
| 2383 | } |
| 2384 | |
| 2385 | #if IS_ENABLED(CONFIG_NFS_V4_2) |
| 2386 | int |
| 2387 | pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) |
| 2388 | { |
| 2389 | struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; |
| 2390 | struct nfs_server *server = NFS_SERVER(inode); |
| 2391 | struct nfs_inode *nfsi = NFS_I(inode); |
| 2392 | struct nfs42_layoutstat_data *data; |
| 2393 | struct pnfs_layout_hdr *hdr; |
| 2394 | int status = 0; |
| 2395 | |
| 2396 | if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) |
| 2397 | goto out; |
| 2398 | |
| 2399 | if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) |
| 2400 | goto out; |
| 2401 | |
| 2402 | if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) |
| 2403 | goto out; |
| 2404 | |
| 2405 | spin_lock(&inode->i_lock); |
| 2406 | if (!NFS_I(inode)->layout) { |
| 2407 | spin_unlock(&inode->i_lock); |
| 2408 | goto out; |
| 2409 | } |
| 2410 | hdr = NFS_I(inode)->layout; |
| 2411 | pnfs_get_layout_hdr(hdr); |
| 2412 | spin_unlock(&inode->i_lock); |
| 2413 | |
| 2414 | data = kzalloc(sizeof(*data), gfp_flags); |
| 2415 | if (!data) { |
| 2416 | status = -ENOMEM; |
| 2417 | goto out_put; |
| 2418 | } |
| 2419 | |
| 2420 | data->args.fh = NFS_FH(inode); |
| 2421 | data->args.inode = inode; |
| 2422 | nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid); |
| 2423 | status = ld->prepare_layoutstats(&data->args); |
| 2424 | if (status) |
| 2425 | goto out_free; |
| 2426 | |
| 2427 | status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); |
| 2428 | |
| 2429 | out: |
| 2430 | dprintk("%s returns %d\n", __func__, status); |
| 2431 | return status; |
| 2432 | |
| 2433 | out_free: |
| 2434 | kfree(data); |
| 2435 | out_put: |
| 2436 | pnfs_put_layout_hdr(hdr); |
| 2437 | smp_mb__before_atomic(); |
| 2438 | clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); |
| 2439 | smp_mb__after_atomic(); |
| 2440 | goto out; |
| 2441 | } |
| 2442 | EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); |
| 2443 | #endif |
| 2444 | |
| 2445 | unsigned int layoutstats_timer; |
| 2446 | module_param(layoutstats_timer, uint, 0644); |
| 2447 | EXPORT_SYMBOL_GPL(layoutstats_timer); |