| 1 | /* |
| 2 | * Copyright (C) 2005, 2006 |
| 3 | * Avishay Traeger (avishay@gmail.com) |
| 4 | * Copyright (C) 2008, 2009 |
| 5 | * Boaz Harrosh <bharrosh@panasas.com> |
| 6 | * |
| 7 | * Copyrights for code taken from ext2: |
| 8 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 9 | * Remy Card (card@masi.ibp.fr) |
| 10 | * Laboratoire MASI - Institut Blaise Pascal |
| 11 | * Universite Pierre et Marie Curie (Paris VI) |
| 12 | * from |
| 13 | * linux/fs/minix/inode.c |
| 14 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 15 | * |
| 16 | * This file is part of exofs. |
| 17 | * |
| 18 | * exofs is free software; you can redistribute it and/or modify |
| 19 | * it under the terms of the GNU General Public License as published by |
| 20 | * the Free Software Foundation. Since it is based on ext2, and the only |
| 21 | * valid version of GPL for the Linux kernel is version 2, the only valid |
| 22 | * version of GPL for exofs is version 2. |
| 23 | * |
| 24 | * exofs is distributed in the hope that it will be useful, |
| 25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 27 | * GNU General Public License for more details. |
| 28 | * |
| 29 | * You should have received a copy of the GNU General Public License |
| 30 | * along with exofs; if not, write to the Free Software |
| 31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 32 | */ |
| 33 | |
| 34 | #include <linux/slab.h> |
| 35 | |
| 36 | #include "exofs.h" |
| 37 | |
| 38 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
| 39 | |
| 40 | enum {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), }; |
| 41 | |
| 42 | unsigned exofs_max_io_pages(struct ore_layout *layout, |
| 43 | unsigned expected_pages) |
| 44 | { |
| 45 | unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC); |
| 46 | |
| 47 | /* TODO: easily support bio chaining */ |
| 48 | pages = min_t(unsigned, pages, layout->max_io_length / PAGE_SIZE); |
| 49 | return pages; |
| 50 | } |
| 51 | |
| 52 | struct page_collect { |
| 53 | struct exofs_sb_info *sbi; |
| 54 | struct inode *inode; |
| 55 | unsigned expected_pages; |
| 56 | struct ore_io_state *ios; |
| 57 | |
| 58 | struct page **pages; |
| 59 | unsigned alloc_pages; |
| 60 | unsigned nr_pages; |
| 61 | unsigned long length; |
| 62 | loff_t pg_first; /* keep 64bit also in 32-arches */ |
| 63 | bool read_4_write; /* This means two things: that the read is sync |
| 64 | * And the pages should not be unlocked. |
| 65 | */ |
| 66 | struct page *that_locked_page; |
| 67 | }; |
| 68 | |
| 69 | static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, |
| 70 | struct inode *inode) |
| 71 | { |
| 72 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
| 73 | |
| 74 | pcol->sbi = sbi; |
| 75 | pcol->inode = inode; |
| 76 | pcol->expected_pages = expected_pages; |
| 77 | |
| 78 | pcol->ios = NULL; |
| 79 | pcol->pages = NULL; |
| 80 | pcol->alloc_pages = 0; |
| 81 | pcol->nr_pages = 0; |
| 82 | pcol->length = 0; |
| 83 | pcol->pg_first = -1; |
| 84 | pcol->read_4_write = false; |
| 85 | pcol->that_locked_page = NULL; |
| 86 | } |
| 87 | |
| 88 | static void _pcol_reset(struct page_collect *pcol) |
| 89 | { |
| 90 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); |
| 91 | |
| 92 | pcol->pages = NULL; |
| 93 | pcol->alloc_pages = 0; |
| 94 | pcol->nr_pages = 0; |
| 95 | pcol->length = 0; |
| 96 | pcol->pg_first = -1; |
| 97 | pcol->ios = NULL; |
| 98 | pcol->that_locked_page = NULL; |
| 99 | |
| 100 | /* this is probably the end of the loop but in writes |
| 101 | * it might not end here. don't be left with nothing |
| 102 | */ |
| 103 | if (!pcol->expected_pages) |
| 104 | pcol->expected_pages = MAX_PAGES_KMALLOC; |
| 105 | } |
| 106 | |
| 107 | static int pcol_try_alloc(struct page_collect *pcol) |
| 108 | { |
| 109 | unsigned pages; |
| 110 | |
| 111 | /* TODO: easily support bio chaining */ |
| 112 | pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages); |
| 113 | |
| 114 | for (; pages; pages >>= 1) { |
| 115 | pcol->pages = kmalloc(pages * sizeof(struct page *), |
| 116 | GFP_KERNEL); |
| 117 | if (likely(pcol->pages)) { |
| 118 | pcol->alloc_pages = pages; |
| 119 | return 0; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | EXOFS_ERR("Failed to kmalloc expected_pages=%u\n", |
| 124 | pcol->expected_pages); |
| 125 | return -ENOMEM; |
| 126 | } |
| 127 | |
| 128 | static void pcol_free(struct page_collect *pcol) |
| 129 | { |
| 130 | kfree(pcol->pages); |
| 131 | pcol->pages = NULL; |
| 132 | |
| 133 | if (pcol->ios) { |
| 134 | ore_put_io_state(pcol->ios); |
| 135 | pcol->ios = NULL; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static int pcol_add_page(struct page_collect *pcol, struct page *page, |
| 140 | unsigned len) |
| 141 | { |
| 142 | if (unlikely(pcol->nr_pages >= pcol->alloc_pages)) |
| 143 | return -ENOMEM; |
| 144 | |
| 145 | pcol->pages[pcol->nr_pages++] = page; |
| 146 | pcol->length += len; |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | enum {PAGE_WAS_NOT_IN_IO = 17}; |
| 151 | static int update_read_page(struct page *page, int ret) |
| 152 | { |
| 153 | switch (ret) { |
| 154 | case 0: |
| 155 | /* Everything is OK */ |
| 156 | SetPageUptodate(page); |
| 157 | if (PageError(page)) |
| 158 | ClearPageError(page); |
| 159 | break; |
| 160 | case -EFAULT: |
| 161 | /* In this case we were trying to read something that wasn't on |
| 162 | * disk yet - return a page full of zeroes. This should be OK, |
| 163 | * because the object should be empty (if there was a write |
| 164 | * before this read, the read would be waiting with the page |
| 165 | * locked */ |
| 166 | clear_highpage(page); |
| 167 | |
| 168 | SetPageUptodate(page); |
| 169 | if (PageError(page)) |
| 170 | ClearPageError(page); |
| 171 | EXOFS_DBGMSG("recovered read error\n"); |
| 172 | /* fall through */ |
| 173 | case PAGE_WAS_NOT_IN_IO: |
| 174 | ret = 0; /* recovered error */ |
| 175 | break; |
| 176 | default: |
| 177 | SetPageError(page); |
| 178 | } |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | static void update_write_page(struct page *page, int ret) |
| 183 | { |
| 184 | if (unlikely(ret == PAGE_WAS_NOT_IN_IO)) |
| 185 | return; /* don't pass start don't collect $200 */ |
| 186 | |
| 187 | if (ret) { |
| 188 | mapping_set_error(page->mapping, ret); |
| 189 | SetPageError(page); |
| 190 | } |
| 191 | end_page_writeback(page); |
| 192 | } |
| 193 | |
| 194 | /* Called at the end of reads, to optionally unlock pages and update their |
| 195 | * status. |
| 196 | */ |
| 197 | static int __readpages_done(struct page_collect *pcol) |
| 198 | { |
| 199 | int i; |
| 200 | u64 good_bytes; |
| 201 | u64 length = 0; |
| 202 | int ret = ore_check_io(pcol->ios, NULL); |
| 203 | |
| 204 | if (likely(!ret)) { |
| 205 | good_bytes = pcol->length; |
| 206 | ret = PAGE_WAS_NOT_IN_IO; |
| 207 | } else { |
| 208 | good_bytes = 0; |
| 209 | } |
| 210 | |
| 211 | EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx" |
| 212 | " length=0x%lx nr_pages=%u\n", |
| 213 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, |
| 214 | pcol->nr_pages); |
| 215 | |
| 216 | for (i = 0; i < pcol->nr_pages; i++) { |
| 217 | struct page *page = pcol->pages[i]; |
| 218 | struct inode *inode = page->mapping->host; |
| 219 | int page_stat; |
| 220 | |
| 221 | if (inode != pcol->inode) |
| 222 | continue; /* osd might add more pages at end */ |
| 223 | |
| 224 | if (likely(length < good_bytes)) |
| 225 | page_stat = 0; |
| 226 | else |
| 227 | page_stat = ret; |
| 228 | |
| 229 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
| 230 | inode->i_ino, page->index, |
| 231 | page_stat ? "bad_bytes" : "good_bytes"); |
| 232 | |
| 233 | ret = update_read_page(page, page_stat); |
| 234 | if (!pcol->read_4_write) |
| 235 | unlock_page(page); |
| 236 | length += PAGE_SIZE; |
| 237 | } |
| 238 | |
| 239 | pcol_free(pcol); |
| 240 | EXOFS_DBGMSG2("readpages_done END\n"); |
| 241 | return ret; |
| 242 | } |
| 243 | |
| 244 | /* callback of async reads */ |
| 245 | static void readpages_done(struct ore_io_state *ios, void *p) |
| 246 | { |
| 247 | struct page_collect *pcol = p; |
| 248 | |
| 249 | __readpages_done(pcol); |
| 250 | atomic_dec(&pcol->sbi->s_curr_pending); |
| 251 | kfree(pcol); |
| 252 | } |
| 253 | |
| 254 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) |
| 255 | { |
| 256 | int i; |
| 257 | |
| 258 | for (i = 0; i < pcol->nr_pages; i++) { |
| 259 | struct page *page = pcol->pages[i]; |
| 260 | |
| 261 | if (rw == READ) |
| 262 | update_read_page(page, ret); |
| 263 | else |
| 264 | update_write_page(page, ret); |
| 265 | |
| 266 | unlock_page(page); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | static int _maybe_not_all_in_one_io(struct ore_io_state *ios, |
| 271 | struct page_collect *pcol_src, struct page_collect *pcol) |
| 272 | { |
| 273 | /* length was wrong or offset was not page aligned */ |
| 274 | BUG_ON(pcol_src->nr_pages < ios->nr_pages); |
| 275 | |
| 276 | if (pcol_src->nr_pages > ios->nr_pages) { |
| 277 | struct page **src_page; |
| 278 | unsigned pages_less = pcol_src->nr_pages - ios->nr_pages; |
| 279 | unsigned long len_less = pcol_src->length - ios->length; |
| 280 | unsigned i; |
| 281 | int ret; |
| 282 | |
| 283 | /* This IO was trimmed */ |
| 284 | pcol_src->nr_pages = ios->nr_pages; |
| 285 | pcol_src->length = ios->length; |
| 286 | |
| 287 | /* Left over pages are passed to the next io */ |
| 288 | pcol->expected_pages += pages_less; |
| 289 | pcol->nr_pages = pages_less; |
| 290 | pcol->length = len_less; |
| 291 | src_page = pcol_src->pages + pcol_src->nr_pages; |
| 292 | pcol->pg_first = (*src_page)->index; |
| 293 | |
| 294 | ret = pcol_try_alloc(pcol); |
| 295 | if (unlikely(ret)) |
| 296 | return ret; |
| 297 | |
| 298 | for (i = 0; i < pages_less; ++i) |
| 299 | pcol->pages[i] = *src_page++; |
| 300 | |
| 301 | EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x " |
| 302 | "pages_less=0x%x expected_pages=0x%x " |
| 303 | "next_offset=0x%llx next_len=0x%lx\n", |
| 304 | pcol_src->nr_pages, pages_less, pcol->expected_pages, |
| 305 | pcol->pg_first * PAGE_SIZE, pcol->length); |
| 306 | } |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | static int read_exec(struct page_collect *pcol) |
| 311 | { |
| 312 | struct exofs_i_info *oi = exofs_i(pcol->inode); |
| 313 | struct ore_io_state *ios; |
| 314 | struct page_collect *pcol_copy = NULL; |
| 315 | int ret; |
| 316 | |
| 317 | if (!pcol->pages) |
| 318 | return 0; |
| 319 | |
| 320 | if (!pcol->ios) { |
| 321 | int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true, |
| 322 | pcol->pg_first << PAGE_CACHE_SHIFT, |
| 323 | pcol->length, &pcol->ios); |
| 324 | |
| 325 | if (ret) |
| 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | ios = pcol->ios; |
| 330 | ios->pages = pcol->pages; |
| 331 | |
| 332 | if (pcol->read_4_write) { |
| 333 | ore_read(pcol->ios); |
| 334 | return __readpages_done(pcol); |
| 335 | } |
| 336 | |
| 337 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
| 338 | if (!pcol_copy) { |
| 339 | ret = -ENOMEM; |
| 340 | goto err; |
| 341 | } |
| 342 | |
| 343 | *pcol_copy = *pcol; |
| 344 | ios->done = readpages_done; |
| 345 | ios->private = pcol_copy; |
| 346 | |
| 347 | /* pages ownership was passed to pcol_copy */ |
| 348 | _pcol_reset(pcol); |
| 349 | |
| 350 | ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol); |
| 351 | if (unlikely(ret)) |
| 352 | goto err; |
| 353 | |
| 354 | EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n", |
| 355 | pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length)); |
| 356 | |
| 357 | ret = ore_read(ios); |
| 358 | if (unlikely(ret)) |
| 359 | goto err; |
| 360 | |
| 361 | atomic_inc(&pcol->sbi->s_curr_pending); |
| 362 | |
| 363 | return 0; |
| 364 | |
| 365 | err: |
| 366 | if (!pcol->read_4_write) |
| 367 | _unlock_pcol_pages(pcol, ret, READ); |
| 368 | |
| 369 | pcol_free(pcol); |
| 370 | |
| 371 | kfree(pcol_copy); |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | /* readpage_strip is called either directly from readpage() or by the VFS from |
| 376 | * within read_cache_pages(), to add one more page to be read. It will try to |
| 377 | * collect as many contiguous pages as posible. If a discontinuity is |
| 378 | * encountered, or it runs out of resources, it will submit the previous segment |
| 379 | * and will start a new collection. Eventually caller must submit the last |
| 380 | * segment if present. |
| 381 | */ |
| 382 | static int readpage_strip(void *data, struct page *page) |
| 383 | { |
| 384 | struct page_collect *pcol = data; |
| 385 | struct inode *inode = pcol->inode; |
| 386 | struct exofs_i_info *oi = exofs_i(inode); |
| 387 | loff_t i_size = i_size_read(inode); |
| 388 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 389 | size_t len; |
| 390 | int ret; |
| 391 | |
| 392 | /* FIXME: Just for debugging, will be removed */ |
| 393 | if (PageUptodate(page)) |
| 394 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, |
| 395 | page->index); |
| 396 | |
| 397 | pcol->that_locked_page = page; |
| 398 | |
| 399 | if (page->index < end_index) |
| 400 | len = PAGE_CACHE_SIZE; |
| 401 | else if (page->index == end_index) |
| 402 | len = i_size & ~PAGE_CACHE_MASK; |
| 403 | else |
| 404 | len = 0; |
| 405 | |
| 406 | if (!len || !obj_created(oi)) { |
| 407 | /* this will be out of bounds, or doesn't exist yet. |
| 408 | * Current page is cleared and the request is split |
| 409 | */ |
| 410 | clear_highpage(page); |
| 411 | |
| 412 | SetPageUptodate(page); |
| 413 | if (PageError(page)) |
| 414 | ClearPageError(page); |
| 415 | |
| 416 | if (!pcol->read_4_write) |
| 417 | unlock_page(page); |
| 418 | EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx " |
| 419 | "read_4_write=%d index=0x%lx end_index=0x%lx " |
| 420 | "splitting\n", inode->i_ino, len, |
| 421 | pcol->read_4_write, page->index, end_index); |
| 422 | |
| 423 | return read_exec(pcol); |
| 424 | } |
| 425 | |
| 426 | try_again: |
| 427 | |
| 428 | if (unlikely(pcol->pg_first == -1)) { |
| 429 | pcol->pg_first = page->index; |
| 430 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != |
| 431 | page->index)) { |
| 432 | /* Discontinuity detected, split the request */ |
| 433 | ret = read_exec(pcol); |
| 434 | if (unlikely(ret)) |
| 435 | goto fail; |
| 436 | goto try_again; |
| 437 | } |
| 438 | |
| 439 | if (!pcol->pages) { |
| 440 | ret = pcol_try_alloc(pcol); |
| 441 | if (unlikely(ret)) |
| 442 | goto fail; |
| 443 | } |
| 444 | |
| 445 | if (len != PAGE_CACHE_SIZE) |
| 446 | zero_user(page, len, PAGE_CACHE_SIZE - len); |
| 447 | |
| 448 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
| 449 | inode->i_ino, page->index, len); |
| 450 | |
| 451 | ret = pcol_add_page(pcol, page, len); |
| 452 | if (ret) { |
| 453 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
| 454 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
| 455 | page, len, pcol->nr_pages, pcol->length); |
| 456 | |
| 457 | /* split the request, and start again with current page */ |
| 458 | ret = read_exec(pcol); |
| 459 | if (unlikely(ret)) |
| 460 | goto fail; |
| 461 | |
| 462 | goto try_again; |
| 463 | } |
| 464 | |
| 465 | return 0; |
| 466 | |
| 467 | fail: |
| 468 | /* SetPageError(page); ??? */ |
| 469 | unlock_page(page); |
| 470 | return ret; |
| 471 | } |
| 472 | |
| 473 | static int exofs_readpages(struct file *file, struct address_space *mapping, |
| 474 | struct list_head *pages, unsigned nr_pages) |
| 475 | { |
| 476 | struct page_collect pcol; |
| 477 | int ret; |
| 478 | |
| 479 | _pcol_init(&pcol, nr_pages, mapping->host); |
| 480 | |
| 481 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); |
| 482 | if (ret) { |
| 483 | EXOFS_ERR("read_cache_pages => %d\n", ret); |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | ret = read_exec(&pcol); |
| 488 | if (unlikely(ret)) |
| 489 | return ret; |
| 490 | |
| 491 | return read_exec(&pcol); |
| 492 | } |
| 493 | |
| 494 | static int _readpage(struct page *page, bool read_4_write) |
| 495 | { |
| 496 | struct page_collect pcol; |
| 497 | int ret; |
| 498 | |
| 499 | _pcol_init(&pcol, 1, page->mapping->host); |
| 500 | |
| 501 | pcol.read_4_write = read_4_write; |
| 502 | ret = readpage_strip(&pcol, page); |
| 503 | if (ret) { |
| 504 | EXOFS_ERR("_readpage => %d\n", ret); |
| 505 | return ret; |
| 506 | } |
| 507 | |
| 508 | return read_exec(&pcol); |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * We don't need the file |
| 513 | */ |
| 514 | static int exofs_readpage(struct file *file, struct page *page) |
| 515 | { |
| 516 | return _readpage(page, false); |
| 517 | } |
| 518 | |
| 519 | /* Callback for osd_write. All writes are asynchronous */ |
| 520 | static void writepages_done(struct ore_io_state *ios, void *p) |
| 521 | { |
| 522 | struct page_collect *pcol = p; |
| 523 | int i; |
| 524 | u64 good_bytes; |
| 525 | u64 length = 0; |
| 526 | int ret = ore_check_io(ios, NULL); |
| 527 | |
| 528 | atomic_dec(&pcol->sbi->s_curr_pending); |
| 529 | |
| 530 | if (likely(!ret)) { |
| 531 | good_bytes = pcol->length; |
| 532 | ret = PAGE_WAS_NOT_IN_IO; |
| 533 | } else { |
| 534 | good_bytes = 0; |
| 535 | } |
| 536 | |
| 537 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
| 538 | " length=0x%lx nr_pages=%u\n", |
| 539 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, |
| 540 | pcol->nr_pages); |
| 541 | |
| 542 | for (i = 0; i < pcol->nr_pages; i++) { |
| 543 | struct page *page = pcol->pages[i]; |
| 544 | struct inode *inode = page->mapping->host; |
| 545 | int page_stat; |
| 546 | |
| 547 | if (inode != pcol->inode) |
| 548 | continue; /* osd might add more pages to a bio */ |
| 549 | |
| 550 | if (likely(length < good_bytes)) |
| 551 | page_stat = 0; |
| 552 | else |
| 553 | page_stat = ret; |
| 554 | |
| 555 | update_write_page(page, page_stat); |
| 556 | unlock_page(page); |
| 557 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
| 558 | inode->i_ino, page->index, page_stat); |
| 559 | |
| 560 | length += PAGE_SIZE; |
| 561 | } |
| 562 | |
| 563 | pcol_free(pcol); |
| 564 | kfree(pcol); |
| 565 | EXOFS_DBGMSG2("writepages_done END\n"); |
| 566 | } |
| 567 | |
| 568 | static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate) |
| 569 | { |
| 570 | struct page_collect *pcol = priv; |
| 571 | pgoff_t index = offset / PAGE_SIZE; |
| 572 | |
| 573 | if (!pcol->that_locked_page || |
| 574 | (pcol->that_locked_page->index != index)) { |
| 575 | struct page *page = find_get_page(pcol->inode->i_mapping, index); |
| 576 | |
| 577 | if (!page) { |
| 578 | page = find_or_create_page(pcol->inode->i_mapping, |
| 579 | index, GFP_NOFS); |
| 580 | if (unlikely(!page)) { |
| 581 | EXOFS_DBGMSG("grab_cache_page Failed " |
| 582 | "index=0x%llx\n", _LLU(index)); |
| 583 | return NULL; |
| 584 | } |
| 585 | unlock_page(page); |
| 586 | } |
| 587 | if (PageDirty(page) || PageWriteback(page)) |
| 588 | *uptodate = true; |
| 589 | else |
| 590 | *uptodate = PageUptodate(page); |
| 591 | EXOFS_DBGMSG("index=0x%lx uptodate=%d\n", index, *uptodate); |
| 592 | return page; |
| 593 | } else { |
| 594 | EXOFS_DBGMSG("YES that_locked_page index=0x%lx\n", |
| 595 | pcol->that_locked_page->index); |
| 596 | *uptodate = true; |
| 597 | return pcol->that_locked_page; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | static void __r4w_put_page(void *priv, struct page *page) |
| 602 | { |
| 603 | struct page_collect *pcol = priv; |
| 604 | |
| 605 | if (pcol->that_locked_page != page) { |
| 606 | EXOFS_DBGMSG("index=0x%lx\n", page->index); |
| 607 | page_cache_release(page); |
| 608 | return; |
| 609 | } |
| 610 | EXOFS_DBGMSG("that_locked_page index=0x%lx\n", page->index); |
| 611 | } |
| 612 | |
| 613 | static const struct _ore_r4w_op _r4w_op = { |
| 614 | .get_page = &__r4w_get_page, |
| 615 | .put_page = &__r4w_put_page, |
| 616 | }; |
| 617 | |
| 618 | static int write_exec(struct page_collect *pcol) |
| 619 | { |
| 620 | struct exofs_i_info *oi = exofs_i(pcol->inode); |
| 621 | struct ore_io_state *ios; |
| 622 | struct page_collect *pcol_copy = NULL; |
| 623 | int ret; |
| 624 | |
| 625 | if (!pcol->pages) |
| 626 | return 0; |
| 627 | |
| 628 | BUG_ON(pcol->ios); |
| 629 | ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false, |
| 630 | pcol->pg_first << PAGE_CACHE_SHIFT, |
| 631 | pcol->length, &pcol->ios); |
| 632 | if (unlikely(ret)) |
| 633 | goto err; |
| 634 | |
| 635 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
| 636 | if (!pcol_copy) { |
| 637 | EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n"); |
| 638 | ret = -ENOMEM; |
| 639 | goto err; |
| 640 | } |
| 641 | |
| 642 | *pcol_copy = *pcol; |
| 643 | |
| 644 | ios = pcol->ios; |
| 645 | ios->pages = pcol_copy->pages; |
| 646 | ios->done = writepages_done; |
| 647 | ios->r4w = &_r4w_op; |
| 648 | ios->private = pcol_copy; |
| 649 | |
| 650 | /* pages ownership was passed to pcol_copy */ |
| 651 | _pcol_reset(pcol); |
| 652 | |
| 653 | ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol); |
| 654 | if (unlikely(ret)) |
| 655 | goto err; |
| 656 | |
| 657 | EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n", |
| 658 | pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length)); |
| 659 | |
| 660 | ret = ore_write(ios); |
| 661 | if (unlikely(ret)) { |
| 662 | EXOFS_ERR("write_exec: ore_write() Failed\n"); |
| 663 | goto err; |
| 664 | } |
| 665 | |
| 666 | atomic_inc(&pcol->sbi->s_curr_pending); |
| 667 | return 0; |
| 668 | |
| 669 | err: |
| 670 | _unlock_pcol_pages(pcol, ret, WRITE); |
| 671 | pcol_free(pcol); |
| 672 | kfree(pcol_copy); |
| 673 | |
| 674 | return ret; |
| 675 | } |
| 676 | |
| 677 | /* writepage_strip is called either directly from writepage() or by the VFS from |
| 678 | * within write_cache_pages(), to add one more page to be written to storage. |
| 679 | * It will try to collect as many contiguous pages as possible. If a |
| 680 | * discontinuity is encountered or it runs out of resources it will submit the |
| 681 | * previous segment and will start a new collection. |
| 682 | * Eventually caller must submit the last segment if present. |
| 683 | */ |
| 684 | static int writepage_strip(struct page *page, |
| 685 | struct writeback_control *wbc_unused, void *data) |
| 686 | { |
| 687 | struct page_collect *pcol = data; |
| 688 | struct inode *inode = pcol->inode; |
| 689 | struct exofs_i_info *oi = exofs_i(inode); |
| 690 | loff_t i_size = i_size_read(inode); |
| 691 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 692 | size_t len; |
| 693 | int ret; |
| 694 | |
| 695 | BUG_ON(!PageLocked(page)); |
| 696 | |
| 697 | ret = wait_obj_created(oi); |
| 698 | if (unlikely(ret)) |
| 699 | goto fail; |
| 700 | |
| 701 | if (page->index < end_index) |
| 702 | /* in this case, the page is within the limits of the file */ |
| 703 | len = PAGE_CACHE_SIZE; |
| 704 | else { |
| 705 | len = i_size & ~PAGE_CACHE_MASK; |
| 706 | |
| 707 | if (page->index > end_index || !len) { |
| 708 | /* in this case, the page is outside the limits |
| 709 | * (truncate in progress) |
| 710 | */ |
| 711 | ret = write_exec(pcol); |
| 712 | if (unlikely(ret)) |
| 713 | goto fail; |
| 714 | if (PageError(page)) |
| 715 | ClearPageError(page); |
| 716 | unlock_page(page); |
| 717 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
| 718 | "outside the limits\n", |
| 719 | inode->i_ino, page->index); |
| 720 | return 0; |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | try_again: |
| 725 | |
| 726 | if (unlikely(pcol->pg_first == -1)) { |
| 727 | pcol->pg_first = page->index; |
| 728 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != |
| 729 | page->index)) { |
| 730 | /* Discontinuity detected, split the request */ |
| 731 | ret = write_exec(pcol); |
| 732 | if (unlikely(ret)) |
| 733 | goto fail; |
| 734 | |
| 735 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", |
| 736 | inode->i_ino, page->index); |
| 737 | goto try_again; |
| 738 | } |
| 739 | |
| 740 | if (!pcol->pages) { |
| 741 | ret = pcol_try_alloc(pcol); |
| 742 | if (unlikely(ret)) |
| 743 | goto fail; |
| 744 | } |
| 745 | |
| 746 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
| 747 | inode->i_ino, page->index, len); |
| 748 | |
| 749 | ret = pcol_add_page(pcol, page, len); |
| 750 | if (unlikely(ret)) { |
| 751 | EXOFS_DBGMSG2("Failed pcol_add_page " |
| 752 | "nr_pages=%u total_length=0x%lx\n", |
| 753 | pcol->nr_pages, pcol->length); |
| 754 | |
| 755 | /* split the request, next loop will start again */ |
| 756 | ret = write_exec(pcol); |
| 757 | if (unlikely(ret)) { |
| 758 | EXOFS_DBGMSG("write_exec failed => %d", ret); |
| 759 | goto fail; |
| 760 | } |
| 761 | |
| 762 | goto try_again; |
| 763 | } |
| 764 | |
| 765 | BUG_ON(PageWriteback(page)); |
| 766 | set_page_writeback(page); |
| 767 | |
| 768 | return 0; |
| 769 | |
| 770 | fail: |
| 771 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
| 772 | inode->i_ino, page->index, ret); |
| 773 | set_bit(AS_EIO, &page->mapping->flags); |
| 774 | unlock_page(page); |
| 775 | return ret; |
| 776 | } |
| 777 | |
| 778 | static int exofs_writepages(struct address_space *mapping, |
| 779 | struct writeback_control *wbc) |
| 780 | { |
| 781 | struct page_collect pcol; |
| 782 | long start, end, expected_pages; |
| 783 | int ret; |
| 784 | |
| 785 | start = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 786 | end = (wbc->range_end == LLONG_MAX) ? |
| 787 | start + mapping->nrpages : |
| 788 | wbc->range_end >> PAGE_CACHE_SHIFT; |
| 789 | |
| 790 | if (start || end) |
| 791 | expected_pages = end - start + 1; |
| 792 | else |
| 793 | expected_pages = mapping->nrpages; |
| 794 | |
| 795 | if (expected_pages < 32L) |
| 796 | expected_pages = 32L; |
| 797 | |
| 798 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
| 799 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
| 800 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
| 801 | mapping->nrpages, start, end, expected_pages); |
| 802 | |
| 803 | _pcol_init(&pcol, expected_pages, mapping->host); |
| 804 | |
| 805 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); |
| 806 | if (unlikely(ret)) { |
| 807 | EXOFS_ERR("write_cache_pages => %d\n", ret); |
| 808 | return ret; |
| 809 | } |
| 810 | |
| 811 | ret = write_exec(&pcol); |
| 812 | if (unlikely(ret)) |
| 813 | return ret; |
| 814 | |
| 815 | if (wbc->sync_mode == WB_SYNC_ALL) { |
| 816 | return write_exec(&pcol); /* pump the last reminder */ |
| 817 | } else if (pcol.nr_pages) { |
| 818 | /* not SYNC let the reminder join the next writeout */ |
| 819 | unsigned i; |
| 820 | |
| 821 | for (i = 0; i < pcol.nr_pages; i++) { |
| 822 | struct page *page = pcol.pages[i]; |
| 823 | |
| 824 | end_page_writeback(page); |
| 825 | set_page_dirty(page); |
| 826 | unlock_page(page); |
| 827 | } |
| 828 | } |
| 829 | return 0; |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) |
| 834 | { |
| 835 | struct page_collect pcol; |
| 836 | int ret; |
| 837 | |
| 838 | _pcol_init(&pcol, 1, page->mapping->host); |
| 839 | |
| 840 | ret = writepage_strip(page, NULL, &pcol); |
| 841 | if (ret) { |
| 842 | EXOFS_ERR("exofs_writepage => %d\n", ret); |
| 843 | return ret; |
| 844 | } |
| 845 | |
| 846 | return write_exec(&pcol); |
| 847 | } |
| 848 | */ |
| 849 | /* i_mutex held using inode->i_size directly */ |
| 850 | static void _write_failed(struct inode *inode, loff_t to) |
| 851 | { |
| 852 | if (to > inode->i_size) |
| 853 | truncate_pagecache(inode, to, inode->i_size); |
| 854 | } |
| 855 | |
| 856 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
| 857 | loff_t pos, unsigned len, unsigned flags, |
| 858 | struct page **pagep, void **fsdata) |
| 859 | { |
| 860 | int ret = 0; |
| 861 | struct page *page; |
| 862 | |
| 863 | page = *pagep; |
| 864 | if (page == NULL) { |
| 865 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, |
| 866 | fsdata); |
| 867 | if (ret) { |
| 868 | EXOFS_DBGMSG("simple_write_begin failed\n"); |
| 869 | goto out; |
| 870 | } |
| 871 | |
| 872 | page = *pagep; |
| 873 | } |
| 874 | |
| 875 | /* read modify write */ |
| 876 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { |
| 877 | loff_t i_size = i_size_read(mapping->host); |
| 878 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
| 879 | size_t rlen; |
| 880 | |
| 881 | if (page->index < end_index) |
| 882 | rlen = PAGE_CACHE_SIZE; |
| 883 | else if (page->index == end_index) |
| 884 | rlen = i_size & ~PAGE_CACHE_MASK; |
| 885 | else |
| 886 | rlen = 0; |
| 887 | |
| 888 | if (!rlen) { |
| 889 | clear_highpage(page); |
| 890 | SetPageUptodate(page); |
| 891 | goto out; |
| 892 | } |
| 893 | |
| 894 | ret = _readpage(page, true); |
| 895 | if (ret) { |
| 896 | /*SetPageError was done by _readpage. Is it ok?*/ |
| 897 | unlock_page(page); |
| 898 | EXOFS_DBGMSG("__readpage failed\n"); |
| 899 | } |
| 900 | } |
| 901 | out: |
| 902 | if (unlikely(ret)) |
| 903 | _write_failed(mapping->host, pos + len); |
| 904 | |
| 905 | return ret; |
| 906 | } |
| 907 | |
| 908 | static int exofs_write_begin_export(struct file *file, |
| 909 | struct address_space *mapping, |
| 910 | loff_t pos, unsigned len, unsigned flags, |
| 911 | struct page **pagep, void **fsdata) |
| 912 | { |
| 913 | *pagep = NULL; |
| 914 | |
| 915 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, |
| 916 | fsdata); |
| 917 | } |
| 918 | |
| 919 | static int exofs_write_end(struct file *file, struct address_space *mapping, |
| 920 | loff_t pos, unsigned len, unsigned copied, |
| 921 | struct page *page, void *fsdata) |
| 922 | { |
| 923 | struct inode *inode = mapping->host; |
| 924 | /* According to comment in simple_write_end i_mutex is held */ |
| 925 | loff_t i_size = inode->i_size; |
| 926 | int ret; |
| 927 | |
| 928 | ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); |
| 929 | if (unlikely(ret)) |
| 930 | _write_failed(inode, pos + len); |
| 931 | |
| 932 | /* TODO: once simple_write_end marks inode dirty remove */ |
| 933 | if (i_size != inode->i_size) |
| 934 | mark_inode_dirty(inode); |
| 935 | return ret; |
| 936 | } |
| 937 | |
| 938 | static int exofs_releasepage(struct page *page, gfp_t gfp) |
| 939 | { |
| 940 | EXOFS_DBGMSG("page 0x%lx\n", page->index); |
| 941 | WARN_ON(1); |
| 942 | return 0; |
| 943 | } |
| 944 | |
| 945 | static void exofs_invalidatepage(struct page *page, unsigned long offset) |
| 946 | { |
| 947 | EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset); |
| 948 | WARN_ON(1); |
| 949 | } |
| 950 | |
| 951 | const struct address_space_operations exofs_aops = { |
| 952 | .readpage = exofs_readpage, |
| 953 | .readpages = exofs_readpages, |
| 954 | .writepage = NULL, |
| 955 | .writepages = exofs_writepages, |
| 956 | .write_begin = exofs_write_begin_export, |
| 957 | .write_end = exofs_write_end, |
| 958 | .releasepage = exofs_releasepage, |
| 959 | .set_page_dirty = __set_page_dirty_nobuffers, |
| 960 | .invalidatepage = exofs_invalidatepage, |
| 961 | |
| 962 | /* Not implemented Yet */ |
| 963 | .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */ |
| 964 | .direct_IO = NULL, /* TODO: Should be trivial to do */ |
| 965 | |
| 966 | /* With these NULL has special meaning or default is not exported */ |
| 967 | .get_xip_mem = NULL, |
| 968 | .migratepage = NULL, |
| 969 | .launder_page = NULL, |
| 970 | .is_partially_uptodate = NULL, |
| 971 | .error_remove_page = NULL, |
| 972 | }; |
| 973 | |
| 974 | /****************************************************************************** |
| 975 | * INODE OPERATIONS |
| 976 | *****************************************************************************/ |
| 977 | |
| 978 | /* |
| 979 | * Test whether an inode is a fast symlink. |
| 980 | */ |
| 981 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) |
| 982 | { |
| 983 | struct exofs_i_info *oi = exofs_i(inode); |
| 984 | |
| 985 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); |
| 986 | } |
| 987 | |
| 988 | static int _do_truncate(struct inode *inode, loff_t newsize) |
| 989 | { |
| 990 | struct exofs_i_info *oi = exofs_i(inode); |
| 991 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
| 992 | int ret; |
| 993 | |
| 994 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 995 | |
| 996 | ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize); |
| 997 | if (likely(!ret)) |
| 998 | truncate_setsize(inode, newsize); |
| 999 | |
| 1000 | EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n", |
| 1001 | inode->i_ino, newsize, ret); |
| 1002 | return ret; |
| 1003 | } |
| 1004 | |
| 1005 | /* |
| 1006 | * Set inode attributes - update size attribute on OSD if needed, |
| 1007 | * otherwise just call generic functions. |
| 1008 | */ |
| 1009 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) |
| 1010 | { |
| 1011 | struct inode *inode = dentry->d_inode; |
| 1012 | int error; |
| 1013 | |
| 1014 | /* if we are about to modify an object, and it hasn't been |
| 1015 | * created yet, wait |
| 1016 | */ |
| 1017 | error = wait_obj_created(exofs_i(inode)); |
| 1018 | if (unlikely(error)) |
| 1019 | return error; |
| 1020 | |
| 1021 | error = inode_change_ok(inode, iattr); |
| 1022 | if (unlikely(error)) |
| 1023 | return error; |
| 1024 | |
| 1025 | if ((iattr->ia_valid & ATTR_SIZE) && |
| 1026 | iattr->ia_size != i_size_read(inode)) { |
| 1027 | error = _do_truncate(inode, iattr->ia_size); |
| 1028 | if (unlikely(error)) |
| 1029 | return error; |
| 1030 | } |
| 1031 | |
| 1032 | setattr_copy(inode, iattr); |
| 1033 | mark_inode_dirty(inode); |
| 1034 | return 0; |
| 1035 | } |
| 1036 | |
| 1037 | static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF( |
| 1038 | EXOFS_APAGE_FS_DATA, |
| 1039 | EXOFS_ATTR_INODE_FILE_LAYOUT, |
| 1040 | 0); |
| 1041 | static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF( |
| 1042 | EXOFS_APAGE_FS_DATA, |
| 1043 | EXOFS_ATTR_INODE_DIR_LAYOUT, |
| 1044 | 0); |
| 1045 | |
| 1046 | /* |
| 1047 | * Read the Linux inode info from the OSD, and return it as is. In exofs the |
| 1048 | * inode info is in an application specific page/attribute of the osd-object. |
| 1049 | */ |
| 1050 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, |
| 1051 | struct exofs_fcb *inode) |
| 1052 | { |
| 1053 | struct exofs_sb_info *sbi = sb->s_fs_info; |
| 1054 | struct osd_attr attrs[] = { |
| 1055 | [0] = g_attr_inode_data, |
| 1056 | [1] = g_attr_inode_file_layout, |
| 1057 | [2] = g_attr_inode_dir_layout, |
| 1058 | }; |
| 1059 | struct ore_io_state *ios; |
| 1060 | struct exofs_on_disk_inode_layout *layout; |
| 1061 | int ret; |
| 1062 | |
| 1063 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
| 1064 | if (unlikely(ret)) { |
| 1065 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
| 1066 | return ret; |
| 1067 | } |
| 1068 | |
| 1069 | attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs); |
| 1070 | attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs); |
| 1071 | |
| 1072 | ios->in_attr = attrs; |
| 1073 | ios->in_attr_len = ARRAY_SIZE(attrs); |
| 1074 | |
| 1075 | ret = ore_read(ios); |
| 1076 | if (unlikely(ret)) { |
| 1077 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", |
| 1078 | _LLU(oi->one_comp.obj.id), ret); |
| 1079 | memset(inode, 0, sizeof(*inode)); |
| 1080 | inode->i_mode = 0040000 | (0777 & ~022); |
| 1081 | /* If object is lost on target we might as well enable it's |
| 1082 | * delete. |
| 1083 | */ |
| 1084 | if ((ret == -ENOENT) || (ret == -EINVAL)) |
| 1085 | ret = 0; |
| 1086 | goto out; |
| 1087 | } |
| 1088 | |
| 1089 | ret = extract_attr_from_ios(ios, &attrs[0]); |
| 1090 | if (ret) { |
| 1091 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
| 1092 | goto out; |
| 1093 | } |
| 1094 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
| 1095 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); |
| 1096 | |
| 1097 | ret = extract_attr_from_ios(ios, &attrs[1]); |
| 1098 | if (ret) { |
| 1099 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
| 1100 | goto out; |
| 1101 | } |
| 1102 | if (attrs[1].len) { |
| 1103 | layout = attrs[1].val_ptr; |
| 1104 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { |
| 1105 | EXOFS_ERR("%s: unsupported files layout %d\n", |
| 1106 | __func__, layout->gen_func); |
| 1107 | ret = -ENOTSUPP; |
| 1108 | goto out; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | ret = extract_attr_from_ios(ios, &attrs[2]); |
| 1113 | if (ret) { |
| 1114 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
| 1115 | goto out; |
| 1116 | } |
| 1117 | if (attrs[2].len) { |
| 1118 | layout = attrs[2].val_ptr; |
| 1119 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { |
| 1120 | EXOFS_ERR("%s: unsupported meta-data layout %d\n", |
| 1121 | __func__, layout->gen_func); |
| 1122 | ret = -ENOTSUPP; |
| 1123 | goto out; |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | out: |
| 1128 | ore_put_io_state(ios); |
| 1129 | return ret; |
| 1130 | } |
| 1131 | |
| 1132 | static void __oi_init(struct exofs_i_info *oi) |
| 1133 | { |
| 1134 | init_waitqueue_head(&oi->i_wq); |
| 1135 | oi->i_flags = 0; |
| 1136 | } |
| 1137 | /* |
| 1138 | * Fill in an inode read from the OSD and set it up for use |
| 1139 | */ |
| 1140 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) |
| 1141 | { |
| 1142 | struct exofs_i_info *oi; |
| 1143 | struct exofs_fcb fcb; |
| 1144 | struct inode *inode; |
| 1145 | int ret; |
| 1146 | |
| 1147 | inode = iget_locked(sb, ino); |
| 1148 | if (!inode) |
| 1149 | return ERR_PTR(-ENOMEM); |
| 1150 | if (!(inode->i_state & I_NEW)) |
| 1151 | return inode; |
| 1152 | oi = exofs_i(inode); |
| 1153 | __oi_init(oi); |
| 1154 | exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info, |
| 1155 | exofs_oi_objno(oi)); |
| 1156 | |
| 1157 | /* read the inode from the osd */ |
| 1158 | ret = exofs_get_inode(sb, oi, &fcb); |
| 1159 | if (ret) |
| 1160 | goto bad_inode; |
| 1161 | |
| 1162 | set_obj_created(oi); |
| 1163 | |
| 1164 | /* copy stuff from on-disk struct to in-memory struct */ |
| 1165 | inode->i_mode = le16_to_cpu(fcb.i_mode); |
| 1166 | inode->i_uid = le32_to_cpu(fcb.i_uid); |
| 1167 | inode->i_gid = le32_to_cpu(fcb.i_gid); |
| 1168 | set_nlink(inode, le16_to_cpu(fcb.i_links_count)); |
| 1169 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); |
| 1170 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); |
| 1171 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); |
| 1172 | inode->i_ctime.tv_nsec = |
| 1173 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; |
| 1174 | oi->i_commit_size = le64_to_cpu(fcb.i_size); |
| 1175 | i_size_write(inode, oi->i_commit_size); |
| 1176 | inode->i_blkbits = EXOFS_BLKSHIFT; |
| 1177 | inode->i_generation = le32_to_cpu(fcb.i_generation); |
| 1178 | |
| 1179 | oi->i_dir_start_lookup = 0; |
| 1180 | |
| 1181 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { |
| 1182 | ret = -ESTALE; |
| 1183 | goto bad_inode; |
| 1184 | } |
| 1185 | |
| 1186 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
| 1187 | if (fcb.i_data[0]) |
| 1188 | inode->i_rdev = |
| 1189 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); |
| 1190 | else |
| 1191 | inode->i_rdev = |
| 1192 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); |
| 1193 | } else { |
| 1194 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); |
| 1195 | } |
| 1196 | |
| 1197 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
| 1198 | if (S_ISREG(inode->i_mode)) { |
| 1199 | inode->i_op = &exofs_file_inode_operations; |
| 1200 | inode->i_fop = &exofs_file_operations; |
| 1201 | inode->i_mapping->a_ops = &exofs_aops; |
| 1202 | } else if (S_ISDIR(inode->i_mode)) { |
| 1203 | inode->i_op = &exofs_dir_inode_operations; |
| 1204 | inode->i_fop = &exofs_dir_operations; |
| 1205 | inode->i_mapping->a_ops = &exofs_aops; |
| 1206 | } else if (S_ISLNK(inode->i_mode)) { |
| 1207 | if (exofs_inode_is_fast_symlink(inode)) |
| 1208 | inode->i_op = &exofs_fast_symlink_inode_operations; |
| 1209 | else { |
| 1210 | inode->i_op = &exofs_symlink_inode_operations; |
| 1211 | inode->i_mapping->a_ops = &exofs_aops; |
| 1212 | } |
| 1213 | } else { |
| 1214 | inode->i_op = &exofs_special_inode_operations; |
| 1215 | if (fcb.i_data[0]) |
| 1216 | init_special_inode(inode, inode->i_mode, |
| 1217 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); |
| 1218 | else |
| 1219 | init_special_inode(inode, inode->i_mode, |
| 1220 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); |
| 1221 | } |
| 1222 | |
| 1223 | unlock_new_inode(inode); |
| 1224 | return inode; |
| 1225 | |
| 1226 | bad_inode: |
| 1227 | iget_failed(inode); |
| 1228 | return ERR_PTR(ret); |
| 1229 | } |
| 1230 | |
| 1231 | int __exofs_wait_obj_created(struct exofs_i_info *oi) |
| 1232 | { |
| 1233 | if (!obj_created(oi)) { |
| 1234 | EXOFS_DBGMSG("!obj_created\n"); |
| 1235 | BUG_ON(!obj_2bcreated(oi)); |
| 1236 | wait_event(oi->i_wq, obj_created(oi)); |
| 1237 | EXOFS_DBGMSG("wait_event done\n"); |
| 1238 | } |
| 1239 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; |
| 1240 | } |
| 1241 | |
| 1242 | /* |
| 1243 | * Callback function from exofs_new_inode(). The important thing is that we |
| 1244 | * set the obj_created flag so that other methods know that the object exists on |
| 1245 | * the OSD. |
| 1246 | */ |
| 1247 | static void create_done(struct ore_io_state *ios, void *p) |
| 1248 | { |
| 1249 | struct inode *inode = p; |
| 1250 | struct exofs_i_info *oi = exofs_i(inode); |
| 1251 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
| 1252 | int ret; |
| 1253 | |
| 1254 | ret = ore_check_io(ios, NULL); |
| 1255 | ore_put_io_state(ios); |
| 1256 | |
| 1257 | atomic_dec(&sbi->s_curr_pending); |
| 1258 | |
| 1259 | if (unlikely(ret)) { |
| 1260 | EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx", |
| 1261 | _LLU(exofs_oi_objno(oi)), |
| 1262 | _LLU(oi->one_comp.obj.partition)); |
| 1263 | /*TODO: When FS is corrupted creation can fail, object already |
| 1264 | * exist. Get rid of this asynchronous creation, if exist |
| 1265 | * increment the obj counter and try the next object. Until we |
| 1266 | * succeed. All these dangling objects will be made into lost |
| 1267 | * files by chkfs.exofs |
| 1268 | */ |
| 1269 | } |
| 1270 | |
| 1271 | set_obj_created(oi); |
| 1272 | |
| 1273 | wake_up(&oi->i_wq); |
| 1274 | } |
| 1275 | |
| 1276 | /* |
| 1277 | * Set up a new inode and create an object for it on the OSD |
| 1278 | */ |
| 1279 | struct inode *exofs_new_inode(struct inode *dir, umode_t mode) |
| 1280 | { |
| 1281 | struct super_block *sb = dir->i_sb; |
| 1282 | struct exofs_sb_info *sbi = sb->s_fs_info; |
| 1283 | struct inode *inode; |
| 1284 | struct exofs_i_info *oi; |
| 1285 | struct ore_io_state *ios; |
| 1286 | int ret; |
| 1287 | |
| 1288 | inode = new_inode(sb); |
| 1289 | if (!inode) |
| 1290 | return ERR_PTR(-ENOMEM); |
| 1291 | |
| 1292 | oi = exofs_i(inode); |
| 1293 | __oi_init(oi); |
| 1294 | |
| 1295 | set_obj_2bcreated(oi); |
| 1296 | |
| 1297 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
| 1298 | inode_init_owner(inode, dir, mode); |
| 1299 | inode->i_ino = sbi->s_nextid++; |
| 1300 | inode->i_blkbits = EXOFS_BLKSHIFT; |
| 1301 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| 1302 | oi->i_commit_size = inode->i_size = 0; |
| 1303 | spin_lock(&sbi->s_next_gen_lock); |
| 1304 | inode->i_generation = sbi->s_next_generation++; |
| 1305 | spin_unlock(&sbi->s_next_gen_lock); |
| 1306 | insert_inode_hash(inode); |
| 1307 | |
| 1308 | exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info, |
| 1309 | exofs_oi_objno(oi)); |
| 1310 | exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */ |
| 1311 | |
| 1312 | mark_inode_dirty(inode); |
| 1313 | |
| 1314 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
| 1315 | if (unlikely(ret)) { |
| 1316 | EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n"); |
| 1317 | return ERR_PTR(ret); |
| 1318 | } |
| 1319 | |
| 1320 | ios->done = create_done; |
| 1321 | ios->private = inode; |
| 1322 | |
| 1323 | ret = ore_create(ios); |
| 1324 | if (ret) { |
| 1325 | ore_put_io_state(ios); |
| 1326 | return ERR_PTR(ret); |
| 1327 | } |
| 1328 | atomic_inc(&sbi->s_curr_pending); |
| 1329 | |
| 1330 | return inode; |
| 1331 | } |
| 1332 | |
| 1333 | /* |
| 1334 | * struct to pass two arguments to update_inode's callback |
| 1335 | */ |
| 1336 | struct updatei_args { |
| 1337 | struct exofs_sb_info *sbi; |
| 1338 | struct exofs_fcb fcb; |
| 1339 | }; |
| 1340 | |
| 1341 | /* |
| 1342 | * Callback function from exofs_update_inode(). |
| 1343 | */ |
| 1344 | static void updatei_done(struct ore_io_state *ios, void *p) |
| 1345 | { |
| 1346 | struct updatei_args *args = p; |
| 1347 | |
| 1348 | ore_put_io_state(ios); |
| 1349 | |
| 1350 | atomic_dec(&args->sbi->s_curr_pending); |
| 1351 | |
| 1352 | kfree(args); |
| 1353 | } |
| 1354 | |
| 1355 | /* |
| 1356 | * Write the inode to the OSD. Just fill up the struct, and set the attribute |
| 1357 | * synchronously or asynchronously depending on the do_sync flag. |
| 1358 | */ |
| 1359 | static int exofs_update_inode(struct inode *inode, int do_sync) |
| 1360 | { |
| 1361 | struct exofs_i_info *oi = exofs_i(inode); |
| 1362 | struct super_block *sb = inode->i_sb; |
| 1363 | struct exofs_sb_info *sbi = sb->s_fs_info; |
| 1364 | struct ore_io_state *ios; |
| 1365 | struct osd_attr attr; |
| 1366 | struct exofs_fcb *fcb; |
| 1367 | struct updatei_args *args; |
| 1368 | int ret; |
| 1369 | |
| 1370 | args = kzalloc(sizeof(*args), GFP_KERNEL); |
| 1371 | if (!args) { |
| 1372 | EXOFS_DBGMSG("Failed kzalloc of args\n"); |
| 1373 | return -ENOMEM; |
| 1374 | } |
| 1375 | |
| 1376 | fcb = &args->fcb; |
| 1377 | |
| 1378 | fcb->i_mode = cpu_to_le16(inode->i_mode); |
| 1379 | fcb->i_uid = cpu_to_le32(inode->i_uid); |
| 1380 | fcb->i_gid = cpu_to_le32(inode->i_gid); |
| 1381 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); |
| 1382 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); |
| 1383 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); |
| 1384 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); |
| 1385 | oi->i_commit_size = i_size_read(inode); |
| 1386 | fcb->i_size = cpu_to_le64(oi->i_commit_size); |
| 1387 | fcb->i_generation = cpu_to_le32(inode->i_generation); |
| 1388 | |
| 1389 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
| 1390 | if (old_valid_dev(inode->i_rdev)) { |
| 1391 | fcb->i_data[0] = |
| 1392 | cpu_to_le32(old_encode_dev(inode->i_rdev)); |
| 1393 | fcb->i_data[1] = 0; |
| 1394 | } else { |
| 1395 | fcb->i_data[0] = 0; |
| 1396 | fcb->i_data[1] = |
| 1397 | cpu_to_le32(new_encode_dev(inode->i_rdev)); |
| 1398 | fcb->i_data[2] = 0; |
| 1399 | } |
| 1400 | } else |
| 1401 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); |
| 1402 | |
| 1403 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
| 1404 | if (unlikely(ret)) { |
| 1405 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
| 1406 | goto free_args; |
| 1407 | } |
| 1408 | |
| 1409 | attr = g_attr_inode_data; |
| 1410 | attr.val_ptr = fcb; |
| 1411 | ios->out_attr_len = 1; |
| 1412 | ios->out_attr = &attr; |
| 1413 | |
| 1414 | wait_obj_created(oi); |
| 1415 | |
| 1416 | if (!do_sync) { |
| 1417 | args->sbi = sbi; |
| 1418 | ios->done = updatei_done; |
| 1419 | ios->private = args; |
| 1420 | } |
| 1421 | |
| 1422 | ret = ore_write(ios); |
| 1423 | if (!do_sync && !ret) { |
| 1424 | atomic_inc(&sbi->s_curr_pending); |
| 1425 | goto out; /* deallocation in updatei_done */ |
| 1426 | } |
| 1427 | |
| 1428 | ore_put_io_state(ios); |
| 1429 | free_args: |
| 1430 | kfree(args); |
| 1431 | out: |
| 1432 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
| 1433 | inode->i_ino, do_sync, ret); |
| 1434 | return ret; |
| 1435 | } |
| 1436 | |
| 1437 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
| 1438 | { |
| 1439 | /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */ |
| 1440 | return exofs_update_inode(inode, 1); |
| 1441 | } |
| 1442 | |
| 1443 | /* |
| 1444 | * Callback function from exofs_delete_inode() - don't have much cleaning up to |
| 1445 | * do. |
| 1446 | */ |
| 1447 | static void delete_done(struct ore_io_state *ios, void *p) |
| 1448 | { |
| 1449 | struct exofs_sb_info *sbi = p; |
| 1450 | |
| 1451 | ore_put_io_state(ios); |
| 1452 | |
| 1453 | atomic_dec(&sbi->s_curr_pending); |
| 1454 | } |
| 1455 | |
| 1456 | /* |
| 1457 | * Called when the refcount of an inode reaches zero. We remove the object |
| 1458 | * from the OSD here. We make sure the object was created before we try and |
| 1459 | * delete it. |
| 1460 | */ |
| 1461 | void exofs_evict_inode(struct inode *inode) |
| 1462 | { |
| 1463 | struct exofs_i_info *oi = exofs_i(inode); |
| 1464 | struct super_block *sb = inode->i_sb; |
| 1465 | struct exofs_sb_info *sbi = sb->s_fs_info; |
| 1466 | struct ore_io_state *ios; |
| 1467 | int ret; |
| 1468 | |
| 1469 | truncate_inode_pages(&inode->i_data, 0); |
| 1470 | |
| 1471 | /* TODO: should do better here */ |
| 1472 | if (inode->i_nlink || is_bad_inode(inode)) |
| 1473 | goto no_delete; |
| 1474 | |
| 1475 | inode->i_size = 0; |
| 1476 | end_writeback(inode); |
| 1477 | |
| 1478 | /* if we are deleting an obj that hasn't been created yet, wait. |
| 1479 | * This also makes sure that create_done cannot be called with an |
| 1480 | * already evicted inode. |
| 1481 | */ |
| 1482 | wait_obj_created(oi); |
| 1483 | /* ignore the error, attempt a remove anyway */ |
| 1484 | |
| 1485 | /* Now Remove the OSD objects */ |
| 1486 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
| 1487 | if (unlikely(ret)) { |
| 1488 | EXOFS_ERR("%s: ore_get_io_state failed\n", __func__); |
| 1489 | return; |
| 1490 | } |
| 1491 | |
| 1492 | ios->done = delete_done; |
| 1493 | ios->private = sbi; |
| 1494 | |
| 1495 | ret = ore_remove(ios); |
| 1496 | if (ret) { |
| 1497 | EXOFS_ERR("%s: ore_remove failed\n", __func__); |
| 1498 | ore_put_io_state(ios); |
| 1499 | return; |
| 1500 | } |
| 1501 | atomic_inc(&sbi->s_curr_pending); |
| 1502 | |
| 1503 | return; |
| 1504 | |
| 1505 | no_delete: |
| 1506 | end_writeback(inode); |
| 1507 | } |