| 1 | /* |
| 2 | * linux/fs/nfs/blocklayout/blocklayout.c |
| 3 | * |
| 4 | * Module for the NFSv4.1 pNFS block layout driver. |
| 5 | * |
| 6 | * Copyright (c) 2006 The Regents of the University of Michigan. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Andy Adamson <andros@citi.umich.edu> |
| 10 | * Fred Isaman <iisaman@umich.edu> |
| 11 | * |
| 12 | * permission is granted to use, copy, create derivative works and |
| 13 | * redistribute this software and such derivative works for any purpose, |
| 14 | * so long as the name of the university of michigan is not used in |
| 15 | * any advertising or publicity pertaining to the use or distribution |
| 16 | * of this software without specific, written prior authorization. if |
| 17 | * the above copyright notice or any other identification of the |
| 18 | * university of michigan is included in any copy of any portion of |
| 19 | * this software, then the disclaimer below must also be included. |
| 20 | * |
| 21 | * this software is provided as is, without representation from the |
| 22 | * university of michigan as to its fitness for any purpose, and without |
| 23 | * warranty by the university of michigan of any kind, either express |
| 24 | * or implied, including without limitation the implied warranties of |
| 25 | * merchantability and fitness for a particular purpose. the regents |
| 26 | * of the university of michigan shall not be liable for any damages, |
| 27 | * including special, indirect, incidental, or consequential damages, |
| 28 | * with respect to any claim arising out or in connection with the use |
| 29 | * of the software, even if it has been or is hereafter advised of the |
| 30 | * possibility of such damages. |
| 31 | */ |
| 32 | |
| 33 | #include <linux/module.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/mount.h> |
| 36 | #include <linux/namei.h> |
| 37 | #include <linux/bio.h> /* struct bio */ |
| 38 | #include <linux/prefetch.h> |
| 39 | #include <linux/pagevec.h> |
| 40 | |
| 41 | #include "../pnfs.h" |
| 42 | #include "../nfs4session.h" |
| 43 | #include "../internal.h" |
| 44 | #include "blocklayout.h" |
| 45 | |
| 46 | #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
| 47 | |
| 48 | MODULE_LICENSE("GPL"); |
| 49 | MODULE_AUTHOR("Andy Adamson <andros@citi.umich.edu>"); |
| 50 | MODULE_DESCRIPTION("The NFSv4.1 pNFS Block layout driver"); |
| 51 | |
| 52 | static bool is_hole(struct pnfs_block_extent *be) |
| 53 | { |
| 54 | switch (be->be_state) { |
| 55 | case PNFS_BLOCK_NONE_DATA: |
| 56 | return true; |
| 57 | case PNFS_BLOCK_INVALID_DATA: |
| 58 | return be->be_tag ? false : true; |
| 59 | default: |
| 60 | return false; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | /* The data we are handed might be spread across several bios. We need |
| 65 | * to track when the last one is finished. |
| 66 | */ |
| 67 | struct parallel_io { |
| 68 | struct kref refcnt; |
| 69 | void (*pnfs_callback) (void *data); |
| 70 | void *data; |
| 71 | }; |
| 72 | |
| 73 | static inline struct parallel_io *alloc_parallel(void *data) |
| 74 | { |
| 75 | struct parallel_io *rv; |
| 76 | |
| 77 | rv = kmalloc(sizeof(*rv), GFP_NOFS); |
| 78 | if (rv) { |
| 79 | rv->data = data; |
| 80 | kref_init(&rv->refcnt); |
| 81 | } |
| 82 | return rv; |
| 83 | } |
| 84 | |
| 85 | static inline void get_parallel(struct parallel_io *p) |
| 86 | { |
| 87 | kref_get(&p->refcnt); |
| 88 | } |
| 89 | |
| 90 | static void destroy_parallel(struct kref *kref) |
| 91 | { |
| 92 | struct parallel_io *p = container_of(kref, struct parallel_io, refcnt); |
| 93 | |
| 94 | dprintk("%s enter\n", __func__); |
| 95 | p->pnfs_callback(p->data); |
| 96 | kfree(p); |
| 97 | } |
| 98 | |
| 99 | static inline void put_parallel(struct parallel_io *p) |
| 100 | { |
| 101 | kref_put(&p->refcnt, destroy_parallel); |
| 102 | } |
| 103 | |
| 104 | static struct bio * |
| 105 | bl_submit_bio(struct bio *bio) |
| 106 | { |
| 107 | if (bio) { |
| 108 | get_parallel(bio->bi_private); |
| 109 | dprintk("%s submitting %s bio %u@%llu\n", __func__, |
| 110 | bio_op(bio) == READ ? "read" : "write", |
| 111 | bio->bi_iter.bi_size, |
| 112 | (unsigned long long)bio->bi_iter.bi_sector); |
| 113 | submit_bio(bio); |
| 114 | } |
| 115 | return NULL; |
| 116 | } |
| 117 | |
| 118 | static bool offset_in_map(u64 offset, struct pnfs_block_dev_map *map) |
| 119 | { |
| 120 | return offset >= map->start && offset < map->start + map->len; |
| 121 | } |
| 122 | |
| 123 | static struct bio * |
| 124 | do_add_page_to_bio(struct bio *bio, int npg, enum req_op op, sector_t isect, |
| 125 | struct page *page, struct pnfs_block_dev_map *map, |
| 126 | struct pnfs_block_extent *be, bio_end_io_t end_io, |
| 127 | struct parallel_io *par, unsigned int offset, int *len) |
| 128 | { |
| 129 | struct pnfs_block_dev *dev = |
| 130 | container_of(be->be_device, struct pnfs_block_dev, node); |
| 131 | u64 disk_addr, end; |
| 132 | |
| 133 | dprintk("%s: npg %d rw %d isect %llu offset %u len %d\n", __func__, |
| 134 | npg, (__force u32)op, (unsigned long long)isect, offset, *len); |
| 135 | |
| 136 | /* translate to device offset */ |
| 137 | isect += be->be_v_offset; |
| 138 | isect -= be->be_f_offset; |
| 139 | |
| 140 | /* translate to physical disk offset */ |
| 141 | disk_addr = (u64)isect << SECTOR_SHIFT; |
| 142 | if (!offset_in_map(disk_addr, map)) { |
| 143 | if (!dev->map(dev, disk_addr, map) || !offset_in_map(disk_addr, map)) |
| 144 | return ERR_PTR(-EIO); |
| 145 | bio = bl_submit_bio(bio); |
| 146 | } |
| 147 | disk_addr += map->disk_offset; |
| 148 | disk_addr -= map->start; |
| 149 | |
| 150 | /* limit length to what the device mapping allows */ |
| 151 | end = disk_addr + *len; |
| 152 | if (end >= map->start + map->len) |
| 153 | *len = map->start + map->len - disk_addr; |
| 154 | |
| 155 | retry: |
| 156 | if (!bio) { |
| 157 | bio = bio_alloc(map->bdev, bio_max_segs(npg), op, GFP_NOIO); |
| 158 | bio->bi_iter.bi_sector = disk_addr >> SECTOR_SHIFT; |
| 159 | bio->bi_end_io = end_io; |
| 160 | bio->bi_private = par; |
| 161 | } |
| 162 | if (bio_add_page(bio, page, *len, offset) < *len) { |
| 163 | bio = bl_submit_bio(bio); |
| 164 | goto retry; |
| 165 | } |
| 166 | return bio; |
| 167 | } |
| 168 | |
| 169 | static void bl_mark_devices_unavailable(struct nfs_pgio_header *header, bool rw) |
| 170 | { |
| 171 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
| 172 | size_t bytes_left = header->args.count; |
| 173 | sector_t isect, extent_length = 0; |
| 174 | struct pnfs_block_extent be; |
| 175 | |
| 176 | isect = header->args.offset >> SECTOR_SHIFT; |
| 177 | bytes_left += header->args.offset - (isect << SECTOR_SHIFT); |
| 178 | |
| 179 | while (bytes_left > 0) { |
| 180 | if (!ext_tree_lookup(bl, isect, &be, rw)) |
| 181 | return; |
| 182 | extent_length = be.be_length - (isect - be.be_f_offset); |
| 183 | nfs4_mark_deviceid_unavailable(be.be_device); |
| 184 | isect += extent_length; |
| 185 | if (bytes_left > extent_length << SECTOR_SHIFT) |
| 186 | bytes_left -= extent_length << SECTOR_SHIFT; |
| 187 | else |
| 188 | bytes_left = 0; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | static void bl_end_io_read(struct bio *bio) |
| 193 | { |
| 194 | struct parallel_io *par = bio->bi_private; |
| 195 | |
| 196 | if (bio->bi_status) { |
| 197 | struct nfs_pgio_header *header = par->data; |
| 198 | |
| 199 | if (!header->pnfs_error) |
| 200 | header->pnfs_error = -EIO; |
| 201 | pnfs_set_lo_fail(header->lseg); |
| 202 | bl_mark_devices_unavailable(header, false); |
| 203 | } |
| 204 | |
| 205 | bio_put(bio); |
| 206 | put_parallel(par); |
| 207 | } |
| 208 | |
| 209 | static void bl_read_cleanup(struct work_struct *work) |
| 210 | { |
| 211 | struct rpc_task *task; |
| 212 | struct nfs_pgio_header *hdr; |
| 213 | dprintk("%s enter\n", __func__); |
| 214 | task = container_of(work, struct rpc_task, u.tk_work); |
| 215 | hdr = container_of(task, struct nfs_pgio_header, task); |
| 216 | pnfs_ld_read_done(hdr); |
| 217 | } |
| 218 | |
| 219 | static void |
| 220 | bl_end_par_io_read(void *data) |
| 221 | { |
| 222 | struct nfs_pgio_header *hdr = data; |
| 223 | |
| 224 | hdr->task.tk_status = hdr->pnfs_error; |
| 225 | INIT_WORK(&hdr->task.u.tk_work, bl_read_cleanup); |
| 226 | schedule_work(&hdr->task.u.tk_work); |
| 227 | } |
| 228 | |
| 229 | static enum pnfs_try_status |
| 230 | bl_read_pagelist(struct nfs_pgio_header *header) |
| 231 | { |
| 232 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
| 233 | struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
| 234 | struct bio *bio = NULL; |
| 235 | struct pnfs_block_extent be; |
| 236 | sector_t isect, extent_length = 0; |
| 237 | struct parallel_io *par; |
| 238 | loff_t f_offset = header->args.offset; |
| 239 | size_t bytes_left = header->args.count; |
| 240 | unsigned int pg_offset = header->args.pgbase, pg_len; |
| 241 | struct page **pages = header->args.pages; |
| 242 | int pg_index = header->args.pgbase >> PAGE_SHIFT; |
| 243 | const bool is_dio = (header->dreq != NULL); |
| 244 | struct blk_plug plug; |
| 245 | int i; |
| 246 | |
| 247 | dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__, |
| 248 | header->page_array.npages, f_offset, |
| 249 | (unsigned int)header->args.count); |
| 250 | |
| 251 | par = alloc_parallel(header); |
| 252 | if (!par) |
| 253 | return PNFS_NOT_ATTEMPTED; |
| 254 | par->pnfs_callback = bl_end_par_io_read; |
| 255 | |
| 256 | blk_start_plug(&plug); |
| 257 | |
| 258 | isect = (sector_t) (f_offset >> SECTOR_SHIFT); |
| 259 | /* Code assumes extents are page-aligned */ |
| 260 | for (i = pg_index; i < header->page_array.npages; i++) { |
| 261 | if (extent_length <= 0) { |
| 262 | /* We've used up the previous extent */ |
| 263 | bio = bl_submit_bio(bio); |
| 264 | |
| 265 | /* Get the next one */ |
| 266 | if (!ext_tree_lookup(bl, isect, &be, false)) { |
| 267 | header->pnfs_error = -EIO; |
| 268 | goto out; |
| 269 | } |
| 270 | extent_length = be.be_length - (isect - be.be_f_offset); |
| 271 | } |
| 272 | |
| 273 | if (is_dio) { |
| 274 | if (pg_offset + bytes_left > PAGE_SIZE) |
| 275 | pg_len = PAGE_SIZE - pg_offset; |
| 276 | else |
| 277 | pg_len = bytes_left; |
| 278 | } else { |
| 279 | BUG_ON(pg_offset != 0); |
| 280 | pg_len = PAGE_SIZE; |
| 281 | } |
| 282 | |
| 283 | if (is_hole(&be)) { |
| 284 | bio = bl_submit_bio(bio); |
| 285 | /* Fill hole w/ zeroes w/o accessing device */ |
| 286 | dprintk("%s Zeroing page for hole\n", __func__); |
| 287 | zero_user_segment(pages[i], pg_offset, pg_len); |
| 288 | |
| 289 | /* invalidate map */ |
| 290 | map.start = NFS4_MAX_UINT64; |
| 291 | } else { |
| 292 | bio = do_add_page_to_bio(bio, |
| 293 | header->page_array.npages - i, |
| 294 | REQ_OP_READ, |
| 295 | isect, pages[i], &map, &be, |
| 296 | bl_end_io_read, par, |
| 297 | pg_offset, &pg_len); |
| 298 | if (IS_ERR(bio)) { |
| 299 | header->pnfs_error = PTR_ERR(bio); |
| 300 | bio = NULL; |
| 301 | goto out; |
| 302 | } |
| 303 | } |
| 304 | isect += (pg_len >> SECTOR_SHIFT); |
| 305 | extent_length -= (pg_len >> SECTOR_SHIFT); |
| 306 | f_offset += pg_len; |
| 307 | bytes_left -= pg_len; |
| 308 | pg_offset = 0; |
| 309 | } |
| 310 | if ((isect << SECTOR_SHIFT) >= header->inode->i_size) { |
| 311 | header->res.eof = 1; |
| 312 | header->res.count = header->inode->i_size - header->args.offset; |
| 313 | } else { |
| 314 | header->res.count = (isect << SECTOR_SHIFT) - header->args.offset; |
| 315 | } |
| 316 | out: |
| 317 | bl_submit_bio(bio); |
| 318 | blk_finish_plug(&plug); |
| 319 | put_parallel(par); |
| 320 | return PNFS_ATTEMPTED; |
| 321 | } |
| 322 | |
| 323 | static void bl_end_io_write(struct bio *bio) |
| 324 | { |
| 325 | struct parallel_io *par = bio->bi_private; |
| 326 | struct nfs_pgio_header *header = par->data; |
| 327 | |
| 328 | if (bio->bi_status) { |
| 329 | if (!header->pnfs_error) |
| 330 | header->pnfs_error = -EIO; |
| 331 | pnfs_set_lo_fail(header->lseg); |
| 332 | bl_mark_devices_unavailable(header, true); |
| 333 | } |
| 334 | bio_put(bio); |
| 335 | put_parallel(par); |
| 336 | } |
| 337 | |
| 338 | /* Function scheduled for call during bl_end_par_io_write, |
| 339 | * it marks sectors as written and extends the commitlist. |
| 340 | */ |
| 341 | static void bl_write_cleanup(struct work_struct *work) |
| 342 | { |
| 343 | struct rpc_task *task = container_of(work, struct rpc_task, u.tk_work); |
| 344 | struct nfs_pgio_header *hdr = |
| 345 | container_of(task, struct nfs_pgio_header, task); |
| 346 | |
| 347 | dprintk("%s enter\n", __func__); |
| 348 | |
| 349 | if (likely(!hdr->pnfs_error)) { |
| 350 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(hdr->lseg); |
| 351 | u64 start = hdr->args.offset & (loff_t)PAGE_MASK; |
| 352 | u64 end = (hdr->args.offset + hdr->args.count + |
| 353 | PAGE_SIZE - 1) & (loff_t)PAGE_MASK; |
| 354 | u64 lwb = hdr->args.offset + hdr->args.count; |
| 355 | |
| 356 | ext_tree_mark_written(bl, start >> SECTOR_SHIFT, |
| 357 | (end - start) >> SECTOR_SHIFT, lwb); |
| 358 | } |
| 359 | |
| 360 | pnfs_ld_write_done(hdr); |
| 361 | } |
| 362 | |
| 363 | /* Called when last of bios associated with a bl_write_pagelist call finishes */ |
| 364 | static void bl_end_par_io_write(void *data) |
| 365 | { |
| 366 | struct nfs_pgio_header *hdr = data; |
| 367 | |
| 368 | hdr->task.tk_status = hdr->pnfs_error; |
| 369 | hdr->verf.committed = NFS_FILE_SYNC; |
| 370 | INIT_WORK(&hdr->task.u.tk_work, bl_write_cleanup); |
| 371 | schedule_work(&hdr->task.u.tk_work); |
| 372 | } |
| 373 | |
| 374 | static enum pnfs_try_status |
| 375 | bl_write_pagelist(struct nfs_pgio_header *header, int sync) |
| 376 | { |
| 377 | struct pnfs_block_layout *bl = BLK_LSEG2EXT(header->lseg); |
| 378 | struct pnfs_block_dev_map map = { .start = NFS4_MAX_UINT64 }; |
| 379 | struct bio *bio = NULL; |
| 380 | struct pnfs_block_extent be; |
| 381 | sector_t isect, extent_length = 0; |
| 382 | struct parallel_io *par = NULL; |
| 383 | loff_t offset = header->args.offset; |
| 384 | size_t count = header->args.count; |
| 385 | struct page **pages = header->args.pages; |
| 386 | int pg_index = header->args.pgbase >> PAGE_SHIFT; |
| 387 | unsigned int pg_len; |
| 388 | struct blk_plug plug; |
| 389 | int i; |
| 390 | |
| 391 | dprintk("%s enter, %zu@%lld\n", __func__, count, offset); |
| 392 | |
| 393 | /* At this point, header->page_aray is a (sequential) list of nfs_pages. |
| 394 | * We want to write each, and if there is an error set pnfs_error |
| 395 | * to have it redone using nfs. |
| 396 | */ |
| 397 | par = alloc_parallel(header); |
| 398 | if (!par) |
| 399 | return PNFS_NOT_ATTEMPTED; |
| 400 | par->pnfs_callback = bl_end_par_io_write; |
| 401 | |
| 402 | blk_start_plug(&plug); |
| 403 | |
| 404 | /* we always write out the whole page */ |
| 405 | offset = offset & (loff_t)PAGE_MASK; |
| 406 | isect = offset >> SECTOR_SHIFT; |
| 407 | |
| 408 | for (i = pg_index; i < header->page_array.npages; i++) { |
| 409 | if (extent_length <= 0) { |
| 410 | /* We've used up the previous extent */ |
| 411 | bio = bl_submit_bio(bio); |
| 412 | /* Get the next one */ |
| 413 | if (!ext_tree_lookup(bl, isect, &be, true)) { |
| 414 | header->pnfs_error = -EINVAL; |
| 415 | goto out; |
| 416 | } |
| 417 | |
| 418 | extent_length = be.be_length - (isect - be.be_f_offset); |
| 419 | } |
| 420 | |
| 421 | pg_len = PAGE_SIZE; |
| 422 | bio = do_add_page_to_bio(bio, header->page_array.npages - i, |
| 423 | REQ_OP_WRITE, isect, pages[i], &map, |
| 424 | &be, bl_end_io_write, par, 0, &pg_len); |
| 425 | if (IS_ERR(bio)) { |
| 426 | header->pnfs_error = PTR_ERR(bio); |
| 427 | bio = NULL; |
| 428 | goto out; |
| 429 | } |
| 430 | |
| 431 | offset += pg_len; |
| 432 | count -= pg_len; |
| 433 | isect += (pg_len >> SECTOR_SHIFT); |
| 434 | extent_length -= (pg_len >> SECTOR_SHIFT); |
| 435 | } |
| 436 | |
| 437 | header->res.count = header->args.count; |
| 438 | out: |
| 439 | bl_submit_bio(bio); |
| 440 | blk_finish_plug(&plug); |
| 441 | put_parallel(par); |
| 442 | return PNFS_ATTEMPTED; |
| 443 | } |
| 444 | |
| 445 | static void bl_free_layout_hdr(struct pnfs_layout_hdr *lo) |
| 446 | { |
| 447 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
| 448 | int err; |
| 449 | |
| 450 | dprintk("%s enter\n", __func__); |
| 451 | |
| 452 | err = ext_tree_remove(bl, true, 0, LLONG_MAX); |
| 453 | WARN_ON(err); |
| 454 | |
| 455 | kfree_rcu(bl, bl_layout.plh_rcu); |
| 456 | } |
| 457 | |
| 458 | static struct pnfs_layout_hdr *__bl_alloc_layout_hdr(struct inode *inode, |
| 459 | gfp_t gfp_flags, bool is_scsi_layout) |
| 460 | { |
| 461 | struct pnfs_block_layout *bl; |
| 462 | |
| 463 | dprintk("%s enter\n", __func__); |
| 464 | bl = kzalloc(sizeof(*bl), gfp_flags); |
| 465 | if (!bl) |
| 466 | return NULL; |
| 467 | |
| 468 | bl->bl_ext_rw = RB_ROOT; |
| 469 | bl->bl_ext_ro = RB_ROOT; |
| 470 | spin_lock_init(&bl->bl_ext_lock); |
| 471 | |
| 472 | bl->bl_scsi_layout = is_scsi_layout; |
| 473 | return &bl->bl_layout; |
| 474 | } |
| 475 | |
| 476 | static struct pnfs_layout_hdr *bl_alloc_layout_hdr(struct inode *inode, |
| 477 | gfp_t gfp_flags) |
| 478 | { |
| 479 | return __bl_alloc_layout_hdr(inode, gfp_flags, false); |
| 480 | } |
| 481 | |
| 482 | static struct pnfs_layout_hdr *sl_alloc_layout_hdr(struct inode *inode, |
| 483 | gfp_t gfp_flags) |
| 484 | { |
| 485 | return __bl_alloc_layout_hdr(inode, gfp_flags, true); |
| 486 | } |
| 487 | |
| 488 | static void bl_free_lseg(struct pnfs_layout_segment *lseg) |
| 489 | { |
| 490 | dprintk("%s enter\n", __func__); |
| 491 | kfree(lseg); |
| 492 | } |
| 493 | |
| 494 | /* Tracks info needed to ensure extents in layout obey constraints of spec */ |
| 495 | struct layout_verification { |
| 496 | u32 mode; /* R or RW */ |
| 497 | u64 start; /* Expected start of next non-COW extent */ |
| 498 | u64 inval; /* Start of INVAL coverage */ |
| 499 | u64 cowread; /* End of COW read coverage */ |
| 500 | }; |
| 501 | |
| 502 | /* Verify the extent meets the layout requirements of the pnfs-block draft, |
| 503 | * section 2.3.1. |
| 504 | */ |
| 505 | static int verify_extent(struct pnfs_block_extent *be, |
| 506 | struct layout_verification *lv) |
| 507 | { |
| 508 | if (lv->mode == IOMODE_READ) { |
| 509 | if (be->be_state == PNFS_BLOCK_READWRITE_DATA || |
| 510 | be->be_state == PNFS_BLOCK_INVALID_DATA) |
| 511 | return -EIO; |
| 512 | if (be->be_f_offset != lv->start) |
| 513 | return -EIO; |
| 514 | lv->start += be->be_length; |
| 515 | return 0; |
| 516 | } |
| 517 | /* lv->mode == IOMODE_RW */ |
| 518 | if (be->be_state == PNFS_BLOCK_READWRITE_DATA) { |
| 519 | if (be->be_f_offset != lv->start) |
| 520 | return -EIO; |
| 521 | if (lv->cowread > lv->start) |
| 522 | return -EIO; |
| 523 | lv->start += be->be_length; |
| 524 | lv->inval = lv->start; |
| 525 | return 0; |
| 526 | } else if (be->be_state == PNFS_BLOCK_INVALID_DATA) { |
| 527 | if (be->be_f_offset != lv->start) |
| 528 | return -EIO; |
| 529 | lv->start += be->be_length; |
| 530 | return 0; |
| 531 | } else if (be->be_state == PNFS_BLOCK_READ_DATA) { |
| 532 | if (be->be_f_offset > lv->start) |
| 533 | return -EIO; |
| 534 | if (be->be_f_offset < lv->inval) |
| 535 | return -EIO; |
| 536 | if (be->be_f_offset < lv->cowread) |
| 537 | return -EIO; |
| 538 | /* It looks like you might want to min this with lv->start, |
| 539 | * but you really don't. |
| 540 | */ |
| 541 | lv->inval = lv->inval + be->be_length; |
| 542 | lv->cowread = be->be_f_offset + be->be_length; |
| 543 | return 0; |
| 544 | } else |
| 545 | return -EIO; |
| 546 | } |
| 547 | |
| 548 | static int decode_sector_number(__be32 **rp, sector_t *sp) |
| 549 | { |
| 550 | uint64_t s; |
| 551 | |
| 552 | *rp = xdr_decode_hyper(*rp, &s); |
| 553 | if (s & 0x1ff) { |
| 554 | printk(KERN_WARNING "NFS: %s: sector not aligned\n", __func__); |
| 555 | return -1; |
| 556 | } |
| 557 | *sp = s >> SECTOR_SHIFT; |
| 558 | return 0; |
| 559 | } |
| 560 | |
| 561 | static struct nfs4_deviceid_node * |
| 562 | bl_find_get_deviceid(struct nfs_server *server, |
| 563 | const struct nfs4_deviceid *id, const struct cred *cred, |
| 564 | gfp_t gfp_mask) |
| 565 | { |
| 566 | struct nfs4_deviceid_node *node; |
| 567 | int err = -ENODEV; |
| 568 | |
| 569 | retry: |
| 570 | node = nfs4_find_get_deviceid(server, id, cred, gfp_mask); |
| 571 | if (!node) |
| 572 | return ERR_PTR(-ENODEV); |
| 573 | |
| 574 | if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags)) { |
| 575 | unsigned long end = jiffies; |
| 576 | unsigned long start = end - PNFS_DEVICE_RETRY_TIMEOUT; |
| 577 | |
| 578 | if (!time_in_range(node->timestamp_unavailable, start, end)) { |
| 579 | nfs4_delete_deviceid(node->ld, node->nfs_client, id); |
| 580 | goto retry; |
| 581 | } |
| 582 | goto out_put; |
| 583 | } |
| 584 | |
| 585 | if (!bl_register_dev(container_of(node, struct pnfs_block_dev, node))) |
| 586 | goto out_put; |
| 587 | |
| 588 | return node; |
| 589 | |
| 590 | out_put: |
| 591 | nfs4_put_deviceid_node(node); |
| 592 | return ERR_PTR(err); |
| 593 | } |
| 594 | |
| 595 | static int |
| 596 | bl_alloc_extent(struct xdr_stream *xdr, struct pnfs_layout_hdr *lo, |
| 597 | struct layout_verification *lv, struct list_head *extents, |
| 598 | gfp_t gfp_mask) |
| 599 | { |
| 600 | struct pnfs_block_extent *be; |
| 601 | struct nfs4_deviceid id; |
| 602 | int error; |
| 603 | __be32 *p; |
| 604 | |
| 605 | p = xdr_inline_decode(xdr, 28 + NFS4_DEVICEID4_SIZE); |
| 606 | if (!p) |
| 607 | return -EIO; |
| 608 | |
| 609 | be = kzalloc(sizeof(*be), GFP_NOFS); |
| 610 | if (!be) |
| 611 | return -ENOMEM; |
| 612 | |
| 613 | memcpy(&id, p, NFS4_DEVICEID4_SIZE); |
| 614 | p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); |
| 615 | |
| 616 | be->be_device = bl_find_get_deviceid(NFS_SERVER(lo->plh_inode), &id, |
| 617 | lo->plh_lc_cred, gfp_mask); |
| 618 | if (IS_ERR(be->be_device)) { |
| 619 | error = PTR_ERR(be->be_device); |
| 620 | goto out_free_be; |
| 621 | } |
| 622 | |
| 623 | /* |
| 624 | * The next three values are read in as bytes, but stored in the |
| 625 | * extent structure in 512-byte granularity. |
| 626 | */ |
| 627 | error = -EIO; |
| 628 | if (decode_sector_number(&p, &be->be_f_offset) < 0) |
| 629 | goto out_put_deviceid; |
| 630 | if (decode_sector_number(&p, &be->be_length) < 0) |
| 631 | goto out_put_deviceid; |
| 632 | if (decode_sector_number(&p, &be->be_v_offset) < 0) |
| 633 | goto out_put_deviceid; |
| 634 | be->be_state = be32_to_cpup(p++); |
| 635 | |
| 636 | error = verify_extent(be, lv); |
| 637 | if (error) { |
| 638 | dprintk("%s: extent verification failed\n", __func__); |
| 639 | goto out_put_deviceid; |
| 640 | } |
| 641 | |
| 642 | list_add_tail(&be->be_list, extents); |
| 643 | return 0; |
| 644 | |
| 645 | out_put_deviceid: |
| 646 | nfs4_put_deviceid_node(be->be_device); |
| 647 | out_free_be: |
| 648 | kfree(be); |
| 649 | return error; |
| 650 | } |
| 651 | |
| 652 | static struct pnfs_layout_segment * |
| 653 | bl_alloc_lseg(struct pnfs_layout_hdr *lo, struct nfs4_layoutget_res *lgr, |
| 654 | gfp_t gfp_mask) |
| 655 | { |
| 656 | struct layout_verification lv = { |
| 657 | .mode = lgr->range.iomode, |
| 658 | .start = lgr->range.offset >> SECTOR_SHIFT, |
| 659 | .inval = lgr->range.offset >> SECTOR_SHIFT, |
| 660 | .cowread = lgr->range.offset >> SECTOR_SHIFT, |
| 661 | }; |
| 662 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
| 663 | struct pnfs_layout_segment *lseg; |
| 664 | struct xdr_buf buf; |
| 665 | struct xdr_stream xdr; |
| 666 | struct page *scratch; |
| 667 | int status, i; |
| 668 | uint32_t count; |
| 669 | __be32 *p; |
| 670 | LIST_HEAD(extents); |
| 671 | |
| 672 | dprintk("---> %s\n", __func__); |
| 673 | |
| 674 | lseg = kzalloc(sizeof(*lseg), gfp_mask); |
| 675 | if (!lseg) |
| 676 | return ERR_PTR(-ENOMEM); |
| 677 | |
| 678 | status = -ENOMEM; |
| 679 | scratch = alloc_page(gfp_mask); |
| 680 | if (!scratch) |
| 681 | goto out; |
| 682 | |
| 683 | xdr_init_decode_pages(&xdr, &buf, |
| 684 | lgr->layoutp->pages, lgr->layoutp->len); |
| 685 | xdr_set_scratch_page(&xdr, scratch); |
| 686 | |
| 687 | status = -EIO; |
| 688 | p = xdr_inline_decode(&xdr, 4); |
| 689 | if (unlikely(!p)) |
| 690 | goto out_free_scratch; |
| 691 | |
| 692 | count = be32_to_cpup(p++); |
| 693 | dprintk("%s: number of extents %d\n", __func__, count); |
| 694 | |
| 695 | /* |
| 696 | * Decode individual extents, putting them in temporary staging area |
| 697 | * until whole layout is decoded to make error recovery easier. |
| 698 | */ |
| 699 | for (i = 0; i < count; i++) { |
| 700 | status = bl_alloc_extent(&xdr, lo, &lv, &extents, gfp_mask); |
| 701 | if (status) |
| 702 | goto process_extents; |
| 703 | } |
| 704 | |
| 705 | if (lgr->range.offset + lgr->range.length != |
| 706 | lv.start << SECTOR_SHIFT) { |
| 707 | dprintk("%s Final length mismatch\n", __func__); |
| 708 | status = -EIO; |
| 709 | goto process_extents; |
| 710 | } |
| 711 | |
| 712 | if (lv.start < lv.cowread) { |
| 713 | dprintk("%s Final uncovered COW extent\n", __func__); |
| 714 | status = -EIO; |
| 715 | } |
| 716 | |
| 717 | process_extents: |
| 718 | while (!list_empty(&extents)) { |
| 719 | struct pnfs_block_extent *be = |
| 720 | list_first_entry(&extents, struct pnfs_block_extent, |
| 721 | be_list); |
| 722 | list_del(&be->be_list); |
| 723 | |
| 724 | if (!status) |
| 725 | status = ext_tree_insert(bl, be); |
| 726 | |
| 727 | if (status) { |
| 728 | nfs4_put_deviceid_node(be->be_device); |
| 729 | kfree(be); |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | out_free_scratch: |
| 734 | __free_page(scratch); |
| 735 | out: |
| 736 | dprintk("%s returns %d\n", __func__, status); |
| 737 | switch (status) { |
| 738 | case -ENODEV: |
| 739 | /* Our extent block devices are unavailable */ |
| 740 | set_bit(NFS_LSEG_UNAVAILABLE, &lseg->pls_flags); |
| 741 | fallthrough; |
| 742 | case 0: |
| 743 | return lseg; |
| 744 | default: |
| 745 | kfree(lseg); |
| 746 | return ERR_PTR(status); |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | static void |
| 751 | bl_return_range(struct pnfs_layout_hdr *lo, |
| 752 | struct pnfs_layout_range *range) |
| 753 | { |
| 754 | struct pnfs_block_layout *bl = BLK_LO2EXT(lo); |
| 755 | sector_t offset = range->offset >> SECTOR_SHIFT, end; |
| 756 | |
| 757 | if (range->offset % 8) { |
| 758 | dprintk("%s: offset %lld not block size aligned\n", |
| 759 | __func__, range->offset); |
| 760 | return; |
| 761 | } |
| 762 | |
| 763 | if (range->length != NFS4_MAX_UINT64) { |
| 764 | if (range->length % 8) { |
| 765 | dprintk("%s: length %lld not block size aligned\n", |
| 766 | __func__, range->length); |
| 767 | return; |
| 768 | } |
| 769 | |
| 770 | end = offset + (range->length >> SECTOR_SHIFT); |
| 771 | } else { |
| 772 | end = round_down(NFS4_MAX_UINT64, PAGE_SIZE); |
| 773 | } |
| 774 | |
| 775 | ext_tree_remove(bl, range->iomode & IOMODE_RW, offset, end); |
| 776 | } |
| 777 | |
| 778 | static int |
| 779 | bl_prepare_layoutcommit(struct nfs4_layoutcommit_args *arg) |
| 780 | { |
| 781 | return ext_tree_prepare_commit(arg); |
| 782 | } |
| 783 | |
| 784 | static void |
| 785 | bl_cleanup_layoutcommit(struct nfs4_layoutcommit_data *lcdata) |
| 786 | { |
| 787 | ext_tree_mark_committed(&lcdata->args, lcdata->res.status); |
| 788 | } |
| 789 | |
| 790 | static int |
| 791 | bl_set_layoutdriver(struct nfs_server *server, const struct nfs_fh *fh) |
| 792 | { |
| 793 | dprintk("%s enter\n", __func__); |
| 794 | |
| 795 | if (server->pnfs_blksize == 0) { |
| 796 | dprintk("%s Server did not return blksize\n", __func__); |
| 797 | return -EINVAL; |
| 798 | } |
| 799 | if (server->pnfs_blksize > PAGE_SIZE) { |
| 800 | printk(KERN_ERR "%s: pNFS blksize %d not supported.\n", |
| 801 | __func__, server->pnfs_blksize); |
| 802 | return -EINVAL; |
| 803 | } |
| 804 | |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | static bool |
| 809 | is_aligned_req(struct nfs_pageio_descriptor *pgio, |
| 810 | struct nfs_page *req, unsigned int alignment, bool is_write) |
| 811 | { |
| 812 | /* |
| 813 | * Always accept buffered writes, higher layers take care of the |
| 814 | * right alignment. |
| 815 | */ |
| 816 | if (pgio->pg_dreq == NULL) |
| 817 | return true; |
| 818 | |
| 819 | if (!IS_ALIGNED(req->wb_offset, alignment)) |
| 820 | return false; |
| 821 | |
| 822 | if (IS_ALIGNED(req->wb_bytes, alignment)) |
| 823 | return true; |
| 824 | |
| 825 | if (is_write && |
| 826 | (req_offset(req) + req->wb_bytes == i_size_read(pgio->pg_inode))) { |
| 827 | /* |
| 828 | * If the write goes up to the inode size, just write |
| 829 | * the full page. Data past the inode size is |
| 830 | * guaranteed to be zeroed by the higher level client |
| 831 | * code, and this behaviour is mandated by RFC 5663 |
| 832 | * section 2.3.2. |
| 833 | */ |
| 834 | return true; |
| 835 | } |
| 836 | |
| 837 | return false; |
| 838 | } |
| 839 | |
| 840 | static void |
| 841 | bl_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| 842 | { |
| 843 | if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) { |
| 844 | nfs_pageio_reset_read_mds(pgio); |
| 845 | return; |
| 846 | } |
| 847 | |
| 848 | pnfs_generic_pg_init_read(pgio, req); |
| 849 | |
| 850 | if (pgio->pg_lseg && |
| 851 | test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) { |
| 852 | pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg); |
| 853 | pnfs_set_lo_fail(pgio->pg_lseg); |
| 854 | nfs_pageio_reset_read_mds(pgio); |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | /* |
| 859 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| 860 | * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| 861 | */ |
| 862 | static size_t |
| 863 | bl_pg_test_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| 864 | struct nfs_page *req) |
| 865 | { |
| 866 | if (!is_aligned_req(pgio, req, SECTOR_SIZE, false)) |
| 867 | return 0; |
| 868 | return pnfs_generic_pg_test(pgio, prev, req); |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Return the number of contiguous bytes for a given inode |
| 873 | * starting at page frame idx. |
| 874 | */ |
| 875 | static u64 pnfs_num_cont_bytes(struct inode *inode, pgoff_t idx) |
| 876 | { |
| 877 | struct address_space *mapping = inode->i_mapping; |
| 878 | pgoff_t end; |
| 879 | |
| 880 | /* Optimize common case that writes from 0 to end of file */ |
| 881 | end = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); |
| 882 | if (end != inode->i_mapping->nrpages) { |
| 883 | rcu_read_lock(); |
| 884 | end = page_cache_next_miss(mapping, idx + 1, ULONG_MAX); |
| 885 | rcu_read_unlock(); |
| 886 | } |
| 887 | |
| 888 | if (!end) |
| 889 | return i_size_read(inode) - (idx << PAGE_SHIFT); |
| 890 | else |
| 891 | return (end - idx) << PAGE_SHIFT; |
| 892 | } |
| 893 | |
| 894 | static void |
| 895 | bl_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| 896 | { |
| 897 | u64 wb_size; |
| 898 | |
| 899 | if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) { |
| 900 | nfs_pageio_reset_write_mds(pgio); |
| 901 | return; |
| 902 | } |
| 903 | |
| 904 | if (pgio->pg_dreq == NULL) |
| 905 | wb_size = pnfs_num_cont_bytes(pgio->pg_inode, req->wb_index); |
| 906 | else |
| 907 | wb_size = nfs_dreq_bytes_left(pgio->pg_dreq, req_offset(req)); |
| 908 | |
| 909 | pnfs_generic_pg_init_write(pgio, req, wb_size); |
| 910 | |
| 911 | if (pgio->pg_lseg && |
| 912 | test_bit(NFS_LSEG_UNAVAILABLE, &pgio->pg_lseg->pls_flags)) { |
| 913 | |
| 914 | pnfs_error_mark_layout_for_return(pgio->pg_inode, pgio->pg_lseg); |
| 915 | pnfs_set_lo_fail(pgio->pg_lseg); |
| 916 | nfs_pageio_reset_write_mds(pgio); |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | /* |
| 921 | * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| 922 | * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| 923 | */ |
| 924 | static size_t |
| 925 | bl_pg_test_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| 926 | struct nfs_page *req) |
| 927 | { |
| 928 | if (!is_aligned_req(pgio, req, PAGE_SIZE, true)) |
| 929 | return 0; |
| 930 | return pnfs_generic_pg_test(pgio, prev, req); |
| 931 | } |
| 932 | |
| 933 | static const struct nfs_pageio_ops bl_pg_read_ops = { |
| 934 | .pg_init = bl_pg_init_read, |
| 935 | .pg_test = bl_pg_test_read, |
| 936 | .pg_doio = pnfs_generic_pg_readpages, |
| 937 | .pg_cleanup = pnfs_generic_pg_cleanup, |
| 938 | }; |
| 939 | |
| 940 | static const struct nfs_pageio_ops bl_pg_write_ops = { |
| 941 | .pg_init = bl_pg_init_write, |
| 942 | .pg_test = bl_pg_test_write, |
| 943 | .pg_doio = pnfs_generic_pg_writepages, |
| 944 | .pg_cleanup = pnfs_generic_pg_cleanup, |
| 945 | }; |
| 946 | |
| 947 | static struct pnfs_layoutdriver_type blocklayout_type = { |
| 948 | .id = LAYOUT_BLOCK_VOLUME, |
| 949 | .name = "LAYOUT_BLOCK_VOLUME", |
| 950 | .owner = THIS_MODULE, |
| 951 | .flags = PNFS_LAYOUTRET_ON_SETATTR | |
| 952 | PNFS_LAYOUTRET_ON_ERROR | |
| 953 | PNFS_READ_WHOLE_PAGE, |
| 954 | .read_pagelist = bl_read_pagelist, |
| 955 | .write_pagelist = bl_write_pagelist, |
| 956 | .alloc_layout_hdr = bl_alloc_layout_hdr, |
| 957 | .free_layout_hdr = bl_free_layout_hdr, |
| 958 | .alloc_lseg = bl_alloc_lseg, |
| 959 | .free_lseg = bl_free_lseg, |
| 960 | .return_range = bl_return_range, |
| 961 | .prepare_layoutcommit = bl_prepare_layoutcommit, |
| 962 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, |
| 963 | .set_layoutdriver = bl_set_layoutdriver, |
| 964 | .alloc_deviceid_node = bl_alloc_deviceid_node, |
| 965 | .free_deviceid_node = bl_free_deviceid_node, |
| 966 | .pg_read_ops = &bl_pg_read_ops, |
| 967 | .pg_write_ops = &bl_pg_write_ops, |
| 968 | .sync = pnfs_generic_sync, |
| 969 | }; |
| 970 | |
| 971 | static struct pnfs_layoutdriver_type scsilayout_type = { |
| 972 | .id = LAYOUT_SCSI, |
| 973 | .name = "LAYOUT_SCSI", |
| 974 | .owner = THIS_MODULE, |
| 975 | .flags = PNFS_LAYOUTRET_ON_SETATTR | |
| 976 | PNFS_LAYOUTRET_ON_ERROR | |
| 977 | PNFS_READ_WHOLE_PAGE, |
| 978 | .read_pagelist = bl_read_pagelist, |
| 979 | .write_pagelist = bl_write_pagelist, |
| 980 | .alloc_layout_hdr = sl_alloc_layout_hdr, |
| 981 | .free_layout_hdr = bl_free_layout_hdr, |
| 982 | .alloc_lseg = bl_alloc_lseg, |
| 983 | .free_lseg = bl_free_lseg, |
| 984 | .return_range = bl_return_range, |
| 985 | .prepare_layoutcommit = bl_prepare_layoutcommit, |
| 986 | .cleanup_layoutcommit = bl_cleanup_layoutcommit, |
| 987 | .set_layoutdriver = bl_set_layoutdriver, |
| 988 | .alloc_deviceid_node = bl_alloc_deviceid_node, |
| 989 | .free_deviceid_node = bl_free_deviceid_node, |
| 990 | .pg_read_ops = &bl_pg_read_ops, |
| 991 | .pg_write_ops = &bl_pg_write_ops, |
| 992 | .sync = pnfs_generic_sync, |
| 993 | }; |
| 994 | |
| 995 | |
| 996 | static int __init nfs4blocklayout_init(void) |
| 997 | { |
| 998 | int ret; |
| 999 | |
| 1000 | dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__); |
| 1001 | |
| 1002 | ret = bl_init_pipefs(); |
| 1003 | if (ret) |
| 1004 | goto out; |
| 1005 | |
| 1006 | ret = pnfs_register_layoutdriver(&blocklayout_type); |
| 1007 | if (ret) |
| 1008 | goto out_cleanup_pipe; |
| 1009 | |
| 1010 | ret = pnfs_register_layoutdriver(&scsilayout_type); |
| 1011 | if (ret) |
| 1012 | goto out_unregister_block; |
| 1013 | return 0; |
| 1014 | |
| 1015 | out_unregister_block: |
| 1016 | pnfs_unregister_layoutdriver(&blocklayout_type); |
| 1017 | out_cleanup_pipe: |
| 1018 | bl_cleanup_pipefs(); |
| 1019 | out: |
| 1020 | return ret; |
| 1021 | } |
| 1022 | |
| 1023 | static void __exit nfs4blocklayout_exit(void) |
| 1024 | { |
| 1025 | dprintk("%s: NFSv4 Block Layout Driver Unregistering...\n", |
| 1026 | __func__); |
| 1027 | |
| 1028 | pnfs_unregister_layoutdriver(&scsilayout_type); |
| 1029 | pnfs_unregister_layoutdriver(&blocklayout_type); |
| 1030 | bl_cleanup_pipefs(); |
| 1031 | } |
| 1032 | |
| 1033 | MODULE_ALIAS("nfs-layouttype4-3"); |
| 1034 | MODULE_ALIAS("nfs-layouttype4-5"); |
| 1035 | |
| 1036 | module_init(nfs4blocklayout_init); |
| 1037 | module_exit(nfs4blocklayout_exit); |