| 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public |
| 17 | * License along with this program; if not, write to the |
| 18 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 19 | * Boston, MA 021110-1307, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/highmem.h> |
| 25 | #include <linux/pagemap.h> |
| 26 | #include <asm/byteorder.h> |
| 27 | #include <linux/swap.h> |
| 28 | #include <linux/pipe_fs_i.h> |
| 29 | #include <linux/mpage.h> |
| 30 | #include <linux/quotaops.h> |
| 31 | #include <linux/blkdev.h> |
| 32 | #include <linux/uio.h> |
| 33 | |
| 34 | #include <cluster/masklog.h> |
| 35 | |
| 36 | #include "ocfs2.h" |
| 37 | |
| 38 | #include "alloc.h" |
| 39 | #include "aops.h" |
| 40 | #include "dlmglue.h" |
| 41 | #include "extent_map.h" |
| 42 | #include "file.h" |
| 43 | #include "inode.h" |
| 44 | #include "journal.h" |
| 45 | #include "suballoc.h" |
| 46 | #include "super.h" |
| 47 | #include "symlink.h" |
| 48 | #include "refcounttree.h" |
| 49 | #include "ocfs2_trace.h" |
| 50 | |
| 51 | #include "buffer_head_io.h" |
| 52 | #include "dir.h" |
| 53 | #include "namei.h" |
| 54 | #include "sysfile.h" |
| 55 | |
| 56 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, |
| 57 | struct buffer_head *bh_result, int create) |
| 58 | { |
| 59 | int err = -EIO; |
| 60 | int status; |
| 61 | struct ocfs2_dinode *fe = NULL; |
| 62 | struct buffer_head *bh = NULL; |
| 63 | struct buffer_head *buffer_cache_bh = NULL; |
| 64 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 65 | void *kaddr; |
| 66 | |
| 67 | trace_ocfs2_symlink_get_block( |
| 68 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 69 | (unsigned long long)iblock, bh_result, create); |
| 70 | |
| 71 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); |
| 72 | |
| 73 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { |
| 74 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", |
| 75 | (unsigned long long)iblock); |
| 76 | goto bail; |
| 77 | } |
| 78 | |
| 79 | status = ocfs2_read_inode_block(inode, &bh); |
| 80 | if (status < 0) { |
| 81 | mlog_errno(status); |
| 82 | goto bail; |
| 83 | } |
| 84 | fe = (struct ocfs2_dinode *) bh->b_data; |
| 85 | |
| 86 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
| 87 | le32_to_cpu(fe->i_clusters))) { |
| 88 | err = -ENOMEM; |
| 89 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
| 90 | "%llu\n", (unsigned long long)iblock); |
| 91 | goto bail; |
| 92 | } |
| 93 | |
| 94 | /* We don't use the page cache to create symlink data, so if |
| 95 | * need be, copy it over from the buffer cache. */ |
| 96 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { |
| 97 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + |
| 98 | iblock; |
| 99 | buffer_cache_bh = sb_getblk(osb->sb, blkno); |
| 100 | if (!buffer_cache_bh) { |
| 101 | err = -ENOMEM; |
| 102 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
| 103 | goto bail; |
| 104 | } |
| 105 | |
| 106 | /* we haven't locked out transactions, so a commit |
| 107 | * could've happened. Since we've got a reference on |
| 108 | * the bh, even if it commits while we're doing the |
| 109 | * copy, the data is still good. */ |
| 110 | if (buffer_jbd(buffer_cache_bh) |
| 111 | && ocfs2_inode_is_new(inode)) { |
| 112 | kaddr = kmap_atomic(bh_result->b_page); |
| 113 | if (!kaddr) { |
| 114 | mlog(ML_ERROR, "couldn't kmap!\n"); |
| 115 | goto bail; |
| 116 | } |
| 117 | memcpy(kaddr + (bh_result->b_size * iblock), |
| 118 | buffer_cache_bh->b_data, |
| 119 | bh_result->b_size); |
| 120 | kunmap_atomic(kaddr); |
| 121 | set_buffer_uptodate(bh_result); |
| 122 | } |
| 123 | brelse(buffer_cache_bh); |
| 124 | } |
| 125 | |
| 126 | map_bh(bh_result, inode->i_sb, |
| 127 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); |
| 128 | |
| 129 | err = 0; |
| 130 | |
| 131 | bail: |
| 132 | brelse(bh); |
| 133 | |
| 134 | return err; |
| 135 | } |
| 136 | |
| 137 | int ocfs2_get_block(struct inode *inode, sector_t iblock, |
| 138 | struct buffer_head *bh_result, int create) |
| 139 | { |
| 140 | int err = 0; |
| 141 | unsigned int ext_flags; |
| 142 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
| 143 | u64 p_blkno, count, past_eof; |
| 144 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 145 | |
| 146 | trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 147 | (unsigned long long)iblock, bh_result, create); |
| 148 | |
| 149 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) |
| 150 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", |
| 151 | inode, inode->i_ino); |
| 152 | |
| 153 | if (S_ISLNK(inode->i_mode)) { |
| 154 | /* this always does I/O for some reason. */ |
| 155 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); |
| 156 | goto bail; |
| 157 | } |
| 158 | |
| 159 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
| 160 | &ext_flags); |
| 161 | if (err) { |
| 162 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " |
| 163 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
| 164 | (unsigned long long)p_blkno); |
| 165 | goto bail; |
| 166 | } |
| 167 | |
| 168 | if (max_blocks < count) |
| 169 | count = max_blocks; |
| 170 | |
| 171 | /* |
| 172 | * ocfs2 never allocates in this function - the only time we |
| 173 | * need to use BH_New is when we're extending i_size on a file |
| 174 | * system which doesn't support holes, in which case BH_New |
| 175 | * allows __block_write_begin() to zero. |
| 176 | * |
| 177 | * If we see this on a sparse file system, then a truncate has |
| 178 | * raced us and removed the cluster. In this case, we clear |
| 179 | * the buffers dirty and uptodate bits and let the buffer code |
| 180 | * ignore it as a hole. |
| 181 | */ |
| 182 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
| 183 | clear_buffer_dirty(bh_result); |
| 184 | clear_buffer_uptodate(bh_result); |
| 185 | goto bail; |
| 186 | } |
| 187 | |
| 188 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
| 189 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
| 190 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 191 | |
| 192 | bh_result->b_size = count << inode->i_blkbits; |
| 193 | |
| 194 | if (!ocfs2_sparse_alloc(osb)) { |
| 195 | if (p_blkno == 0) { |
| 196 | err = -EIO; |
| 197 | mlog(ML_ERROR, |
| 198 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", |
| 199 | (unsigned long long)iblock, |
| 200 | (unsigned long long)p_blkno, |
| 201 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 202 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); |
| 203 | dump_stack(); |
| 204 | goto bail; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
| 209 | |
| 210 | trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 211 | (unsigned long long)past_eof); |
| 212 | if (create && (iblock >= past_eof)) |
| 213 | set_buffer_new(bh_result); |
| 214 | |
| 215 | bail: |
| 216 | if (err < 0) |
| 217 | err = -EIO; |
| 218 | |
| 219 | return err; |
| 220 | } |
| 221 | |
| 222 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
| 223 | struct buffer_head *di_bh) |
| 224 | { |
| 225 | void *kaddr; |
| 226 | loff_t size; |
| 227 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 228 | |
| 229 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { |
| 230 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n", |
| 231 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 232 | return -EROFS; |
| 233 | } |
| 234 | |
| 235 | size = i_size_read(inode); |
| 236 | |
| 237 | if (size > PAGE_SIZE || |
| 238 | size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { |
| 239 | ocfs2_error(inode->i_sb, |
| 240 | "Inode %llu has with inline data has bad size: %Lu\n", |
| 241 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 242 | (unsigned long long)size); |
| 243 | return -EROFS; |
| 244 | } |
| 245 | |
| 246 | kaddr = kmap_atomic(page); |
| 247 | if (size) |
| 248 | memcpy(kaddr, di->id2.i_data.id_data, size); |
| 249 | /* Clear the remaining part of the page */ |
| 250 | memset(kaddr + size, 0, PAGE_SIZE - size); |
| 251 | flush_dcache_page(page); |
| 252 | kunmap_atomic(kaddr); |
| 253 | |
| 254 | SetPageUptodate(page); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) |
| 260 | { |
| 261 | int ret; |
| 262 | struct buffer_head *di_bh = NULL; |
| 263 | |
| 264 | BUG_ON(!PageLocked(page)); |
| 265 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
| 266 | |
| 267 | ret = ocfs2_read_inode_block(inode, &di_bh); |
| 268 | if (ret) { |
| 269 | mlog_errno(ret); |
| 270 | goto out; |
| 271 | } |
| 272 | |
| 273 | ret = ocfs2_read_inline_data(inode, page, di_bh); |
| 274 | out: |
| 275 | unlock_page(page); |
| 276 | |
| 277 | brelse(di_bh); |
| 278 | return ret; |
| 279 | } |
| 280 | |
| 281 | static int ocfs2_readpage(struct file *file, struct page *page) |
| 282 | { |
| 283 | struct inode *inode = page->mapping->host; |
| 284 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 285 | loff_t start = (loff_t)page->index << PAGE_SHIFT; |
| 286 | int ret, unlock = 1; |
| 287 | |
| 288 | trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, |
| 289 | (page ? page->index : 0)); |
| 290 | |
| 291 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
| 292 | if (ret != 0) { |
| 293 | if (ret == AOP_TRUNCATED_PAGE) |
| 294 | unlock = 0; |
| 295 | mlog_errno(ret); |
| 296 | goto out; |
| 297 | } |
| 298 | |
| 299 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
| 300 | /* |
| 301 | * Unlock the page and cycle ip_alloc_sem so that we don't |
| 302 | * busyloop waiting for ip_alloc_sem to unlock |
| 303 | */ |
| 304 | ret = AOP_TRUNCATED_PAGE; |
| 305 | unlock_page(page); |
| 306 | unlock = 0; |
| 307 | down_read(&oi->ip_alloc_sem); |
| 308 | up_read(&oi->ip_alloc_sem); |
| 309 | goto out_inode_unlock; |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * i_size might have just been updated as we grabed the meta lock. We |
| 314 | * might now be discovering a truncate that hit on another node. |
| 315 | * block_read_full_page->get_block freaks out if it is asked to read |
| 316 | * beyond the end of a file, so we check here. Callers |
| 317 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
| 318 | * and notice that the page they just read isn't needed. |
| 319 | * |
| 320 | * XXX sys_readahead() seems to get that wrong? |
| 321 | */ |
| 322 | if (start >= i_size_read(inode)) { |
| 323 | zero_user(page, 0, PAGE_SIZE); |
| 324 | SetPageUptodate(page); |
| 325 | ret = 0; |
| 326 | goto out_alloc; |
| 327 | } |
| 328 | |
| 329 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 330 | ret = ocfs2_readpage_inline(inode, page); |
| 331 | else |
| 332 | ret = block_read_full_page(page, ocfs2_get_block); |
| 333 | unlock = 0; |
| 334 | |
| 335 | out_alloc: |
| 336 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 337 | out_inode_unlock: |
| 338 | ocfs2_inode_unlock(inode, 0); |
| 339 | out: |
| 340 | if (unlock) |
| 341 | unlock_page(page); |
| 342 | return ret; |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * This is used only for read-ahead. Failures or difficult to handle |
| 347 | * situations are safe to ignore. |
| 348 | * |
| 349 | * Right now, we don't bother with BH_Boundary - in-inode extent lists |
| 350 | * are quite large (243 extents on 4k blocks), so most inodes don't |
| 351 | * grow out to a tree. If need be, detecting boundary extents could |
| 352 | * trivially be added in a future version of ocfs2_get_block(). |
| 353 | */ |
| 354 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, |
| 355 | struct list_head *pages, unsigned nr_pages) |
| 356 | { |
| 357 | int ret, err = -EIO; |
| 358 | struct inode *inode = mapping->host; |
| 359 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 360 | loff_t start; |
| 361 | struct page *last; |
| 362 | |
| 363 | /* |
| 364 | * Use the nonblocking flag for the dlm code to avoid page |
| 365 | * lock inversion, but don't bother with retrying. |
| 366 | */ |
| 367 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); |
| 368 | if (ret) |
| 369 | return err; |
| 370 | |
| 371 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
| 372 | ocfs2_inode_unlock(inode, 0); |
| 373 | return err; |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Don't bother with inline-data. There isn't anything |
| 378 | * to read-ahead in that case anyway... |
| 379 | */ |
| 380 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 381 | goto out_unlock; |
| 382 | |
| 383 | /* |
| 384 | * Check whether a remote node truncated this file - we just |
| 385 | * drop out in that case as it's not worth handling here. |
| 386 | */ |
| 387 | last = list_entry(pages->prev, struct page, lru); |
| 388 | start = (loff_t)last->index << PAGE_SHIFT; |
| 389 | if (start >= i_size_read(inode)) |
| 390 | goto out_unlock; |
| 391 | |
| 392 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); |
| 393 | |
| 394 | out_unlock: |
| 395 | up_read(&oi->ip_alloc_sem); |
| 396 | ocfs2_inode_unlock(inode, 0); |
| 397 | |
| 398 | return err; |
| 399 | } |
| 400 | |
| 401 | /* Note: Because we don't support holes, our allocation has |
| 402 | * already happened (allocation writes zeros to the file data) |
| 403 | * so we don't have to worry about ordered writes in |
| 404 | * ocfs2_writepage. |
| 405 | * |
| 406 | * ->writepage is called during the process of invalidating the page cache |
| 407 | * during blocked lock processing. It can't block on any cluster locks |
| 408 | * to during block mapping. It's relying on the fact that the block |
| 409 | * mapping can't have disappeared under the dirty pages that it is |
| 410 | * being asked to write back. |
| 411 | */ |
| 412 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) |
| 413 | { |
| 414 | trace_ocfs2_writepage( |
| 415 | (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, |
| 416 | page->index); |
| 417 | |
| 418 | return block_write_full_page(page, ocfs2_get_block, wbc); |
| 419 | } |
| 420 | |
| 421 | /* Taken from ext3. We don't necessarily need the full blown |
| 422 | * functionality yet, but IMHO it's better to cut and paste the whole |
| 423 | * thing so we can avoid introducing our own bugs (and easily pick up |
| 424 | * their fixes when they happen) --Mark */ |
| 425 | int walk_page_buffers( handle_t *handle, |
| 426 | struct buffer_head *head, |
| 427 | unsigned from, |
| 428 | unsigned to, |
| 429 | int *partial, |
| 430 | int (*fn)( handle_t *handle, |
| 431 | struct buffer_head *bh)) |
| 432 | { |
| 433 | struct buffer_head *bh; |
| 434 | unsigned block_start, block_end; |
| 435 | unsigned blocksize = head->b_size; |
| 436 | int err, ret = 0; |
| 437 | struct buffer_head *next; |
| 438 | |
| 439 | for ( bh = head, block_start = 0; |
| 440 | ret == 0 && (bh != head || !block_start); |
| 441 | block_start = block_end, bh = next) |
| 442 | { |
| 443 | next = bh->b_this_page; |
| 444 | block_end = block_start + blocksize; |
| 445 | if (block_end <= from || block_start >= to) { |
| 446 | if (partial && !buffer_uptodate(bh)) |
| 447 | *partial = 1; |
| 448 | continue; |
| 449 | } |
| 450 | err = (*fn)(handle, bh); |
| 451 | if (!ret) |
| 452 | ret = err; |
| 453 | } |
| 454 | return ret; |
| 455 | } |
| 456 | |
| 457 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
| 458 | { |
| 459 | sector_t status; |
| 460 | u64 p_blkno = 0; |
| 461 | int err = 0; |
| 462 | struct inode *inode = mapping->host; |
| 463 | |
| 464 | trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 465 | (unsigned long long)block); |
| 466 | |
| 467 | /* We don't need to lock journal system files, since they aren't |
| 468 | * accessed concurrently from multiple nodes. |
| 469 | */ |
| 470 | if (!INODE_JOURNAL(inode)) { |
| 471 | err = ocfs2_inode_lock(inode, NULL, 0); |
| 472 | if (err) { |
| 473 | if (err != -ENOENT) |
| 474 | mlog_errno(err); |
| 475 | goto bail; |
| 476 | } |
| 477 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 478 | } |
| 479 | |
| 480 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 481 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, |
| 482 | NULL); |
| 483 | |
| 484 | if (!INODE_JOURNAL(inode)) { |
| 485 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 486 | ocfs2_inode_unlock(inode, 0); |
| 487 | } |
| 488 | |
| 489 | if (err) { |
| 490 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", |
| 491 | (unsigned long long)block); |
| 492 | mlog_errno(err); |
| 493 | goto bail; |
| 494 | } |
| 495 | |
| 496 | bail: |
| 497 | status = err ? 0 : p_blkno; |
| 498 | |
| 499 | return status; |
| 500 | } |
| 501 | |
| 502 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
| 503 | { |
| 504 | if (!page_has_buffers(page)) |
| 505 | return 0; |
| 506 | return try_to_free_buffers(page); |
| 507 | } |
| 508 | |
| 509 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
| 510 | u32 cpos, |
| 511 | unsigned int *start, |
| 512 | unsigned int *end) |
| 513 | { |
| 514 | unsigned int cluster_start = 0, cluster_end = PAGE_SIZE; |
| 515 | |
| 516 | if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) { |
| 517 | unsigned int cpp; |
| 518 | |
| 519 | cpp = 1 << (PAGE_SHIFT - osb->s_clustersize_bits); |
| 520 | |
| 521 | cluster_start = cpos % cpp; |
| 522 | cluster_start = cluster_start << osb->s_clustersize_bits; |
| 523 | |
| 524 | cluster_end = cluster_start + osb->s_clustersize; |
| 525 | } |
| 526 | |
| 527 | BUG_ON(cluster_start > PAGE_SIZE); |
| 528 | BUG_ON(cluster_end > PAGE_SIZE); |
| 529 | |
| 530 | if (start) |
| 531 | *start = cluster_start; |
| 532 | if (end) |
| 533 | *end = cluster_end; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * 'from' and 'to' are the region in the page to avoid zeroing. |
| 538 | * |
| 539 | * If pagesize > clustersize, this function will avoid zeroing outside |
| 540 | * of the cluster boundary. |
| 541 | * |
| 542 | * from == to == 0 is code for "zero the entire cluster region" |
| 543 | */ |
| 544 | static void ocfs2_clear_page_regions(struct page *page, |
| 545 | struct ocfs2_super *osb, u32 cpos, |
| 546 | unsigned from, unsigned to) |
| 547 | { |
| 548 | void *kaddr; |
| 549 | unsigned int cluster_start, cluster_end; |
| 550 | |
| 551 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); |
| 552 | |
| 553 | kaddr = kmap_atomic(page); |
| 554 | |
| 555 | if (from || to) { |
| 556 | if (from > cluster_start) |
| 557 | memset(kaddr + cluster_start, 0, from - cluster_start); |
| 558 | if (to < cluster_end) |
| 559 | memset(kaddr + to, 0, cluster_end - to); |
| 560 | } else { |
| 561 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); |
| 562 | } |
| 563 | |
| 564 | kunmap_atomic(kaddr); |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * Nonsparse file systems fully allocate before we get to the write |
| 569 | * code. This prevents ocfs2_write() from tagging the write as an |
| 570 | * allocating one, which means ocfs2_map_page_blocks() might try to |
| 571 | * read-in the blocks at the tail of our file. Avoid reading them by |
| 572 | * testing i_size against each block offset. |
| 573 | */ |
| 574 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, |
| 575 | unsigned int block_start) |
| 576 | { |
| 577 | u64 offset = page_offset(page) + block_start; |
| 578 | |
| 579 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| 580 | return 1; |
| 581 | |
| 582 | if (i_size_read(inode) > offset) |
| 583 | return 1; |
| 584 | |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * Some of this taken from __block_write_begin(). We already have our |
| 590 | * mapping by now though, and the entire write will be allocating or |
| 591 | * it won't, so not much need to use BH_New. |
| 592 | * |
| 593 | * This will also skip zeroing, which is handled externally. |
| 594 | */ |
| 595 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
| 596 | struct inode *inode, unsigned int from, |
| 597 | unsigned int to, int new) |
| 598 | { |
| 599 | int ret = 0; |
| 600 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; |
| 601 | unsigned int block_end, block_start; |
| 602 | unsigned int bsize = 1 << inode->i_blkbits; |
| 603 | |
| 604 | if (!page_has_buffers(page)) |
| 605 | create_empty_buffers(page, bsize, 0); |
| 606 | |
| 607 | head = page_buffers(page); |
| 608 | for (bh = head, block_start = 0; bh != head || !block_start; |
| 609 | bh = bh->b_this_page, block_start += bsize) { |
| 610 | block_end = block_start + bsize; |
| 611 | |
| 612 | clear_buffer_new(bh); |
| 613 | |
| 614 | /* |
| 615 | * Ignore blocks outside of our i/o range - |
| 616 | * they may belong to unallocated clusters. |
| 617 | */ |
| 618 | if (block_start >= to || block_end <= from) { |
| 619 | if (PageUptodate(page)) |
| 620 | set_buffer_uptodate(bh); |
| 621 | continue; |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * For an allocating write with cluster size >= page |
| 626 | * size, we always write the entire page. |
| 627 | */ |
| 628 | if (new) |
| 629 | set_buffer_new(bh); |
| 630 | |
| 631 | if (!buffer_mapped(bh)) { |
| 632 | map_bh(bh, inode->i_sb, *p_blkno); |
| 633 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 634 | } |
| 635 | |
| 636 | if (PageUptodate(page)) { |
| 637 | if (!buffer_uptodate(bh)) |
| 638 | set_buffer_uptodate(bh); |
| 639 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
| 640 | !buffer_new(bh) && |
| 641 | ocfs2_should_read_blk(inode, page, block_start) && |
| 642 | (block_start < from || block_end > to)) { |
| 643 | ll_rw_block(READ, 1, &bh); |
| 644 | *wait_bh++=bh; |
| 645 | } |
| 646 | |
| 647 | *p_blkno = *p_blkno + 1; |
| 648 | } |
| 649 | |
| 650 | /* |
| 651 | * If we issued read requests - let them complete. |
| 652 | */ |
| 653 | while(wait_bh > wait) { |
| 654 | wait_on_buffer(*--wait_bh); |
| 655 | if (!buffer_uptodate(*wait_bh)) |
| 656 | ret = -EIO; |
| 657 | } |
| 658 | |
| 659 | if (ret == 0 || !new) |
| 660 | return ret; |
| 661 | |
| 662 | /* |
| 663 | * If we get -EIO above, zero out any newly allocated blocks |
| 664 | * to avoid exposing stale data. |
| 665 | */ |
| 666 | bh = head; |
| 667 | block_start = 0; |
| 668 | do { |
| 669 | block_end = block_start + bsize; |
| 670 | if (block_end <= from) |
| 671 | goto next_bh; |
| 672 | if (block_start >= to) |
| 673 | break; |
| 674 | |
| 675 | zero_user(page, block_start, bh->b_size); |
| 676 | set_buffer_uptodate(bh); |
| 677 | mark_buffer_dirty(bh); |
| 678 | |
| 679 | next_bh: |
| 680 | block_start = block_end; |
| 681 | bh = bh->b_this_page; |
| 682 | } while (bh != head); |
| 683 | |
| 684 | return ret; |
| 685 | } |
| 686 | |
| 687 | #if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
| 688 | #define OCFS2_MAX_CTXT_PAGES 1 |
| 689 | #else |
| 690 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_SIZE) |
| 691 | #endif |
| 692 | |
| 693 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
| 694 | |
| 695 | struct ocfs2_unwritten_extent { |
| 696 | struct list_head ue_node; |
| 697 | struct list_head ue_ip_node; |
| 698 | u32 ue_cpos; |
| 699 | u32 ue_phys; |
| 700 | }; |
| 701 | |
| 702 | /* |
| 703 | * Describe the state of a single cluster to be written to. |
| 704 | */ |
| 705 | struct ocfs2_write_cluster_desc { |
| 706 | u32 c_cpos; |
| 707 | u32 c_phys; |
| 708 | /* |
| 709 | * Give this a unique field because c_phys eventually gets |
| 710 | * filled. |
| 711 | */ |
| 712 | unsigned c_new; |
| 713 | unsigned c_clear_unwritten; |
| 714 | unsigned c_needs_zero; |
| 715 | }; |
| 716 | |
| 717 | struct ocfs2_write_ctxt { |
| 718 | /* Logical cluster position / len of write */ |
| 719 | u32 w_cpos; |
| 720 | u32 w_clen; |
| 721 | |
| 722 | /* First cluster allocated in a nonsparse extend */ |
| 723 | u32 w_first_new_cpos; |
| 724 | |
| 725 | /* Type of caller. Must be one of buffer, mmap, direct. */ |
| 726 | ocfs2_write_type_t w_type; |
| 727 | |
| 728 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
| 729 | |
| 730 | /* |
| 731 | * This is true if page_size > cluster_size. |
| 732 | * |
| 733 | * It triggers a set of special cases during write which might |
| 734 | * have to deal with allocating writes to partial pages. |
| 735 | */ |
| 736 | unsigned int w_large_pages; |
| 737 | |
| 738 | /* |
| 739 | * Pages involved in this write. |
| 740 | * |
| 741 | * w_target_page is the page being written to by the user. |
| 742 | * |
| 743 | * w_pages is an array of pages which always contains |
| 744 | * w_target_page, and in the case of an allocating write with |
| 745 | * page_size < cluster size, it will contain zero'd and mapped |
| 746 | * pages adjacent to w_target_page which need to be written |
| 747 | * out in so that future reads from that region will get |
| 748 | * zero's. |
| 749 | */ |
| 750 | unsigned int w_num_pages; |
| 751 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
| 752 | struct page *w_target_page; |
| 753 | |
| 754 | /* |
| 755 | * w_target_locked is used for page_mkwrite path indicating no unlocking |
| 756 | * against w_target_page in ocfs2_write_end_nolock. |
| 757 | */ |
| 758 | unsigned int w_target_locked:1; |
| 759 | |
| 760 | /* |
| 761 | * ocfs2_write_end() uses this to know what the real range to |
| 762 | * write in the target should be. |
| 763 | */ |
| 764 | unsigned int w_target_from; |
| 765 | unsigned int w_target_to; |
| 766 | |
| 767 | /* |
| 768 | * We could use journal_current_handle() but this is cleaner, |
| 769 | * IMHO -Mark |
| 770 | */ |
| 771 | handle_t *w_handle; |
| 772 | |
| 773 | struct buffer_head *w_di_bh; |
| 774 | |
| 775 | struct ocfs2_cached_dealloc_ctxt w_dealloc; |
| 776 | |
| 777 | struct list_head w_unwritten_list; |
| 778 | }; |
| 779 | |
| 780 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
| 781 | { |
| 782 | int i; |
| 783 | |
| 784 | for(i = 0; i < num_pages; i++) { |
| 785 | if (pages[i]) { |
| 786 | unlock_page(pages[i]); |
| 787 | mark_page_accessed(pages[i]); |
| 788 | put_page(pages[i]); |
| 789 | } |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc) |
| 794 | { |
| 795 | int i; |
| 796 | |
| 797 | /* |
| 798 | * w_target_locked is only set to true in the page_mkwrite() case. |
| 799 | * The intent is to allow us to lock the target page from write_begin() |
| 800 | * to write_end(). The caller must hold a ref on w_target_page. |
| 801 | */ |
| 802 | if (wc->w_target_locked) { |
| 803 | BUG_ON(!wc->w_target_page); |
| 804 | for (i = 0; i < wc->w_num_pages; i++) { |
| 805 | if (wc->w_target_page == wc->w_pages[i]) { |
| 806 | wc->w_pages[i] = NULL; |
| 807 | break; |
| 808 | } |
| 809 | } |
| 810 | mark_page_accessed(wc->w_target_page); |
| 811 | put_page(wc->w_target_page); |
| 812 | } |
| 813 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
| 814 | } |
| 815 | |
| 816 | static void ocfs2_free_unwritten_list(struct inode *inode, |
| 817 | struct list_head *head) |
| 818 | { |
| 819 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 820 | struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL; |
| 821 | |
| 822 | list_for_each_entry_safe(ue, tmp, head, ue_node) { |
| 823 | list_del(&ue->ue_node); |
| 824 | spin_lock(&oi->ip_lock); |
| 825 | list_del(&ue->ue_ip_node); |
| 826 | spin_unlock(&oi->ip_lock); |
| 827 | kfree(ue); |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | static void ocfs2_free_write_ctxt(struct inode *inode, |
| 832 | struct ocfs2_write_ctxt *wc) |
| 833 | { |
| 834 | ocfs2_free_unwritten_list(inode, &wc->w_unwritten_list); |
| 835 | ocfs2_unlock_pages(wc); |
| 836 | brelse(wc->w_di_bh); |
| 837 | kfree(wc); |
| 838 | } |
| 839 | |
| 840 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, |
| 841 | struct ocfs2_super *osb, loff_t pos, |
| 842 | unsigned len, ocfs2_write_type_t type, |
| 843 | struct buffer_head *di_bh) |
| 844 | { |
| 845 | u32 cend; |
| 846 | struct ocfs2_write_ctxt *wc; |
| 847 | |
| 848 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); |
| 849 | if (!wc) |
| 850 | return -ENOMEM; |
| 851 | |
| 852 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
| 853 | wc->w_first_new_cpos = UINT_MAX; |
| 854 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
| 855 | wc->w_clen = cend - wc->w_cpos + 1; |
| 856 | get_bh(di_bh); |
| 857 | wc->w_di_bh = di_bh; |
| 858 | wc->w_type = type; |
| 859 | |
| 860 | if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) |
| 861 | wc->w_large_pages = 1; |
| 862 | else |
| 863 | wc->w_large_pages = 0; |
| 864 | |
| 865 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
| 866 | INIT_LIST_HEAD(&wc->w_unwritten_list); |
| 867 | |
| 868 | *wcp = wc; |
| 869 | |
| 870 | return 0; |
| 871 | } |
| 872 | |
| 873 | /* |
| 874 | * If a page has any new buffers, zero them out here, and mark them uptodate |
| 875 | * and dirty so they'll be written out (in order to prevent uninitialised |
| 876 | * block data from leaking). And clear the new bit. |
| 877 | */ |
| 878 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
| 879 | { |
| 880 | unsigned int block_start, block_end; |
| 881 | struct buffer_head *head, *bh; |
| 882 | |
| 883 | BUG_ON(!PageLocked(page)); |
| 884 | if (!page_has_buffers(page)) |
| 885 | return; |
| 886 | |
| 887 | bh = head = page_buffers(page); |
| 888 | block_start = 0; |
| 889 | do { |
| 890 | block_end = block_start + bh->b_size; |
| 891 | |
| 892 | if (buffer_new(bh)) { |
| 893 | if (block_end > from && block_start < to) { |
| 894 | if (!PageUptodate(page)) { |
| 895 | unsigned start, end; |
| 896 | |
| 897 | start = max(from, block_start); |
| 898 | end = min(to, block_end); |
| 899 | |
| 900 | zero_user_segment(page, start, end); |
| 901 | set_buffer_uptodate(bh); |
| 902 | } |
| 903 | |
| 904 | clear_buffer_new(bh); |
| 905 | mark_buffer_dirty(bh); |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | block_start = block_end; |
| 910 | bh = bh->b_this_page; |
| 911 | } while (bh != head); |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * Only called when we have a failure during allocating write to write |
| 916 | * zero's to the newly allocated region. |
| 917 | */ |
| 918 | static void ocfs2_write_failure(struct inode *inode, |
| 919 | struct ocfs2_write_ctxt *wc, |
| 920 | loff_t user_pos, unsigned user_len) |
| 921 | { |
| 922 | int i; |
| 923 | unsigned from = user_pos & (PAGE_SIZE - 1), |
| 924 | to = user_pos + user_len; |
| 925 | struct page *tmppage; |
| 926 | |
| 927 | if (wc->w_target_page) |
| 928 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
| 929 | |
| 930 | for(i = 0; i < wc->w_num_pages; i++) { |
| 931 | tmppage = wc->w_pages[i]; |
| 932 | |
| 933 | if (tmppage && page_has_buffers(tmppage)) { |
| 934 | if (ocfs2_should_order_data(inode)) |
| 935 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
| 936 | |
| 937 | block_commit_write(tmppage, from, to); |
| 938 | } |
| 939 | } |
| 940 | } |
| 941 | |
| 942 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
| 943 | struct ocfs2_write_ctxt *wc, |
| 944 | struct page *page, u32 cpos, |
| 945 | loff_t user_pos, unsigned user_len, |
| 946 | int new) |
| 947 | { |
| 948 | int ret; |
| 949 | unsigned int map_from = 0, map_to = 0; |
| 950 | unsigned int cluster_start, cluster_end; |
| 951 | unsigned int user_data_from = 0, user_data_to = 0; |
| 952 | |
| 953 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
| 954 | &cluster_start, &cluster_end); |
| 955 | |
| 956 | /* treat the write as new if the a hole/lseek spanned across |
| 957 | * the page boundary. |
| 958 | */ |
| 959 | new = new | ((i_size_read(inode) <= page_offset(page)) && |
| 960 | (page_offset(page) <= user_pos)); |
| 961 | |
| 962 | if (page == wc->w_target_page) { |
| 963 | map_from = user_pos & (PAGE_SIZE - 1); |
| 964 | map_to = map_from + user_len; |
| 965 | |
| 966 | if (new) |
| 967 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 968 | cluster_start, cluster_end, |
| 969 | new); |
| 970 | else |
| 971 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 972 | map_from, map_to, new); |
| 973 | if (ret) { |
| 974 | mlog_errno(ret); |
| 975 | goto out; |
| 976 | } |
| 977 | |
| 978 | user_data_from = map_from; |
| 979 | user_data_to = map_to; |
| 980 | if (new) { |
| 981 | map_from = cluster_start; |
| 982 | map_to = cluster_end; |
| 983 | } |
| 984 | } else { |
| 985 | /* |
| 986 | * If we haven't allocated the new page yet, we |
| 987 | * shouldn't be writing it out without copying user |
| 988 | * data. This is likely a math error from the caller. |
| 989 | */ |
| 990 | BUG_ON(!new); |
| 991 | |
| 992 | map_from = cluster_start; |
| 993 | map_to = cluster_end; |
| 994 | |
| 995 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 996 | cluster_start, cluster_end, new); |
| 997 | if (ret) { |
| 998 | mlog_errno(ret); |
| 999 | goto out; |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Parts of newly allocated pages need to be zero'd. |
| 1005 | * |
| 1006 | * Above, we have also rewritten 'to' and 'from' - as far as |
| 1007 | * the rest of the function is concerned, the entire cluster |
| 1008 | * range inside of a page needs to be written. |
| 1009 | * |
| 1010 | * We can skip this if the page is up to date - it's already |
| 1011 | * been zero'd from being read in as a hole. |
| 1012 | */ |
| 1013 | if (new && !PageUptodate(page)) |
| 1014 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), |
| 1015 | cpos, user_data_from, user_data_to); |
| 1016 | |
| 1017 | flush_dcache_page(page); |
| 1018 | |
| 1019 | out: |
| 1020 | return ret; |
| 1021 | } |
| 1022 | |
| 1023 | /* |
| 1024 | * This function will only grab one clusters worth of pages. |
| 1025 | */ |
| 1026 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
| 1027 | struct ocfs2_write_ctxt *wc, |
| 1028 | u32 cpos, loff_t user_pos, |
| 1029 | unsigned user_len, int new, |
| 1030 | struct page *mmap_page) |
| 1031 | { |
| 1032 | int ret = 0, i; |
| 1033 | unsigned long start, target_index, end_index, index; |
| 1034 | struct inode *inode = mapping->host; |
| 1035 | loff_t last_byte; |
| 1036 | |
| 1037 | target_index = user_pos >> PAGE_SHIFT; |
| 1038 | |
| 1039 | /* |
| 1040 | * Figure out how many pages we'll be manipulating here. For |
| 1041 | * non allocating write, we just change the one |
| 1042 | * page. Otherwise, we'll need a whole clusters worth. If we're |
| 1043 | * writing past i_size, we only need enough pages to cover the |
| 1044 | * last page of the write. |
| 1045 | */ |
| 1046 | if (new) { |
| 1047 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
| 1048 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); |
| 1049 | /* |
| 1050 | * We need the index *past* the last page we could possibly |
| 1051 | * touch. This is the page past the end of the write or |
| 1052 | * i_size, whichever is greater. |
| 1053 | */ |
| 1054 | last_byte = max(user_pos + user_len, i_size_read(inode)); |
| 1055 | BUG_ON(last_byte < 1); |
| 1056 | end_index = ((last_byte - 1) >> PAGE_SHIFT) + 1; |
| 1057 | if ((start + wc->w_num_pages) > end_index) |
| 1058 | wc->w_num_pages = end_index - start; |
| 1059 | } else { |
| 1060 | wc->w_num_pages = 1; |
| 1061 | start = target_index; |
| 1062 | } |
| 1063 | end_index = (user_pos + user_len - 1) >> PAGE_SHIFT; |
| 1064 | |
| 1065 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1066 | index = start + i; |
| 1067 | |
| 1068 | if (index >= target_index && index <= end_index && |
| 1069 | wc->w_type == OCFS2_WRITE_MMAP) { |
| 1070 | /* |
| 1071 | * ocfs2_pagemkwrite() is a little different |
| 1072 | * and wants us to directly use the page |
| 1073 | * passed in. |
| 1074 | */ |
| 1075 | lock_page(mmap_page); |
| 1076 | |
| 1077 | /* Exit and let the caller retry */ |
| 1078 | if (mmap_page->mapping != mapping) { |
| 1079 | WARN_ON(mmap_page->mapping); |
| 1080 | unlock_page(mmap_page); |
| 1081 | ret = -EAGAIN; |
| 1082 | goto out; |
| 1083 | } |
| 1084 | |
| 1085 | get_page(mmap_page); |
| 1086 | wc->w_pages[i] = mmap_page; |
| 1087 | wc->w_target_locked = true; |
| 1088 | } else if (index >= target_index && index <= end_index && |
| 1089 | wc->w_type == OCFS2_WRITE_DIRECT) { |
| 1090 | /* Direct write has no mapping page. */ |
| 1091 | wc->w_pages[i] = NULL; |
| 1092 | continue; |
| 1093 | } else { |
| 1094 | wc->w_pages[i] = find_or_create_page(mapping, index, |
| 1095 | GFP_NOFS); |
| 1096 | if (!wc->w_pages[i]) { |
| 1097 | ret = -ENOMEM; |
| 1098 | mlog_errno(ret); |
| 1099 | goto out; |
| 1100 | } |
| 1101 | } |
| 1102 | wait_for_stable_page(wc->w_pages[i]); |
| 1103 | |
| 1104 | if (index == target_index) |
| 1105 | wc->w_target_page = wc->w_pages[i]; |
| 1106 | } |
| 1107 | out: |
| 1108 | if (ret) |
| 1109 | wc->w_target_locked = false; |
| 1110 | return ret; |
| 1111 | } |
| 1112 | |
| 1113 | /* |
| 1114 | * Prepare a single cluster for write one cluster into the file. |
| 1115 | */ |
| 1116 | static int ocfs2_write_cluster(struct address_space *mapping, |
| 1117 | u32 *phys, unsigned int new, |
| 1118 | unsigned int clear_unwritten, |
| 1119 | unsigned int should_zero, |
| 1120 | struct ocfs2_alloc_context *data_ac, |
| 1121 | struct ocfs2_alloc_context *meta_ac, |
| 1122 | struct ocfs2_write_ctxt *wc, u32 cpos, |
| 1123 | loff_t user_pos, unsigned user_len) |
| 1124 | { |
| 1125 | int ret, i; |
| 1126 | u64 p_blkno; |
| 1127 | struct inode *inode = mapping->host; |
| 1128 | struct ocfs2_extent_tree et; |
| 1129 | int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); |
| 1130 | |
| 1131 | if (new) { |
| 1132 | u32 tmp_pos; |
| 1133 | |
| 1134 | /* |
| 1135 | * This is safe to call with the page locks - it won't take |
| 1136 | * any additional semaphores or cluster locks. |
| 1137 | */ |
| 1138 | tmp_pos = cpos; |
| 1139 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
| 1140 | &tmp_pos, 1, !clear_unwritten, |
| 1141 | wc->w_di_bh, wc->w_handle, |
| 1142 | data_ac, meta_ac, NULL); |
| 1143 | /* |
| 1144 | * This shouldn't happen because we must have already |
| 1145 | * calculated the correct meta data allocation required. The |
| 1146 | * internal tree allocation code should know how to increase |
| 1147 | * transaction credits itself. |
| 1148 | * |
| 1149 | * If need be, we could handle -EAGAIN for a |
| 1150 | * RESTART_TRANS here. |
| 1151 | */ |
| 1152 | mlog_bug_on_msg(ret == -EAGAIN, |
| 1153 | "Inode %llu: EAGAIN return during allocation.\n", |
| 1154 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 1155 | if (ret < 0) { |
| 1156 | mlog_errno(ret); |
| 1157 | goto out; |
| 1158 | } |
| 1159 | } else if (clear_unwritten) { |
| 1160 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
| 1161 | wc->w_di_bh); |
| 1162 | ret = ocfs2_mark_extent_written(inode, &et, |
| 1163 | wc->w_handle, cpos, 1, *phys, |
| 1164 | meta_ac, &wc->w_dealloc); |
| 1165 | if (ret < 0) { |
| 1166 | mlog_errno(ret); |
| 1167 | goto out; |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | /* |
| 1172 | * The only reason this should fail is due to an inability to |
| 1173 | * find the extent added. |
| 1174 | */ |
| 1175 | ret = ocfs2_get_clusters(inode, cpos, phys, NULL, NULL); |
| 1176 | if (ret < 0) { |
| 1177 | mlog(ML_ERROR, "Get physical blkno failed for inode %llu, " |
| 1178 | "at logical cluster %u", |
| 1179 | (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos); |
| 1180 | goto out; |
| 1181 | } |
| 1182 | |
| 1183 | BUG_ON(*phys == 0); |
| 1184 | |
| 1185 | p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *phys); |
| 1186 | if (!should_zero) |
| 1187 | p_blkno += (user_pos >> inode->i_sb->s_blocksize_bits) & (u64)(bpc - 1); |
| 1188 | |
| 1189 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1190 | int tmpret; |
| 1191 | |
| 1192 | /* This is the direct io target page. */ |
| 1193 | if (wc->w_pages[i] == NULL) { |
| 1194 | p_blkno++; |
| 1195 | continue; |
| 1196 | } |
| 1197 | |
| 1198 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
| 1199 | wc->w_pages[i], cpos, |
| 1200 | user_pos, user_len, |
| 1201 | should_zero); |
| 1202 | if (tmpret) { |
| 1203 | mlog_errno(tmpret); |
| 1204 | if (ret == 0) |
| 1205 | ret = tmpret; |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * We only have cleanup to do in case of allocating write. |
| 1211 | */ |
| 1212 | if (ret && new) |
| 1213 | ocfs2_write_failure(inode, wc, user_pos, user_len); |
| 1214 | |
| 1215 | out: |
| 1216 | |
| 1217 | return ret; |
| 1218 | } |
| 1219 | |
| 1220 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
| 1221 | struct ocfs2_alloc_context *data_ac, |
| 1222 | struct ocfs2_alloc_context *meta_ac, |
| 1223 | struct ocfs2_write_ctxt *wc, |
| 1224 | loff_t pos, unsigned len) |
| 1225 | { |
| 1226 | int ret, i; |
| 1227 | loff_t cluster_off; |
| 1228 | unsigned int local_len = len; |
| 1229 | struct ocfs2_write_cluster_desc *desc; |
| 1230 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
| 1231 | |
| 1232 | for (i = 0; i < wc->w_clen; i++) { |
| 1233 | desc = &wc->w_desc[i]; |
| 1234 | |
| 1235 | /* |
| 1236 | * We have to make sure that the total write passed in |
| 1237 | * doesn't extend past a single cluster. |
| 1238 | */ |
| 1239 | local_len = len; |
| 1240 | cluster_off = pos & (osb->s_clustersize - 1); |
| 1241 | if ((cluster_off + local_len) > osb->s_clustersize) |
| 1242 | local_len = osb->s_clustersize - cluster_off; |
| 1243 | |
| 1244 | ret = ocfs2_write_cluster(mapping, &desc->c_phys, |
| 1245 | desc->c_new, |
| 1246 | desc->c_clear_unwritten, |
| 1247 | desc->c_needs_zero, |
| 1248 | data_ac, meta_ac, |
| 1249 | wc, desc->c_cpos, pos, local_len); |
| 1250 | if (ret) { |
| 1251 | mlog_errno(ret); |
| 1252 | goto out; |
| 1253 | } |
| 1254 | |
| 1255 | len -= local_len; |
| 1256 | pos += local_len; |
| 1257 | } |
| 1258 | |
| 1259 | ret = 0; |
| 1260 | out: |
| 1261 | return ret; |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | * ocfs2_write_end() wants to know which parts of the target page it |
| 1266 | * should complete the write on. It's easiest to compute them ahead of |
| 1267 | * time when a more complete view of the write is available. |
| 1268 | */ |
| 1269 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, |
| 1270 | struct ocfs2_write_ctxt *wc, |
| 1271 | loff_t pos, unsigned len, int alloc) |
| 1272 | { |
| 1273 | struct ocfs2_write_cluster_desc *desc; |
| 1274 | |
| 1275 | wc->w_target_from = pos & (PAGE_SIZE - 1); |
| 1276 | wc->w_target_to = wc->w_target_from + len; |
| 1277 | |
| 1278 | if (alloc == 0) |
| 1279 | return; |
| 1280 | |
| 1281 | /* |
| 1282 | * Allocating write - we may have different boundaries based |
| 1283 | * on page size and cluster size. |
| 1284 | * |
| 1285 | * NOTE: We can no longer compute one value from the other as |
| 1286 | * the actual write length and user provided length may be |
| 1287 | * different. |
| 1288 | */ |
| 1289 | |
| 1290 | if (wc->w_large_pages) { |
| 1291 | /* |
| 1292 | * We only care about the 1st and last cluster within |
| 1293 | * our range and whether they should be zero'd or not. Either |
| 1294 | * value may be extended out to the start/end of a |
| 1295 | * newly allocated cluster. |
| 1296 | */ |
| 1297 | desc = &wc->w_desc[0]; |
| 1298 | if (desc->c_needs_zero) |
| 1299 | ocfs2_figure_cluster_boundaries(osb, |
| 1300 | desc->c_cpos, |
| 1301 | &wc->w_target_from, |
| 1302 | NULL); |
| 1303 | |
| 1304 | desc = &wc->w_desc[wc->w_clen - 1]; |
| 1305 | if (desc->c_needs_zero) |
| 1306 | ocfs2_figure_cluster_boundaries(osb, |
| 1307 | desc->c_cpos, |
| 1308 | NULL, |
| 1309 | &wc->w_target_to); |
| 1310 | } else { |
| 1311 | wc->w_target_from = 0; |
| 1312 | wc->w_target_to = PAGE_SIZE; |
| 1313 | } |
| 1314 | } |
| 1315 | |
| 1316 | /* |
| 1317 | * Check if this extent is marked UNWRITTEN by direct io. If so, we need not to |
| 1318 | * do the zero work. And should not to clear UNWRITTEN since it will be cleared |
| 1319 | * by the direct io procedure. |
| 1320 | * If this is a new extent that allocated by direct io, we should mark it in |
| 1321 | * the ip_unwritten_list. |
| 1322 | */ |
| 1323 | static int ocfs2_unwritten_check(struct inode *inode, |
| 1324 | struct ocfs2_write_ctxt *wc, |
| 1325 | struct ocfs2_write_cluster_desc *desc) |
| 1326 | { |
| 1327 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1328 | struct ocfs2_unwritten_extent *ue = NULL, *new = NULL; |
| 1329 | int ret = 0; |
| 1330 | |
| 1331 | if (!desc->c_needs_zero) |
| 1332 | return 0; |
| 1333 | |
| 1334 | retry: |
| 1335 | spin_lock(&oi->ip_lock); |
| 1336 | /* Needs not to zero no metter buffer or direct. The one who is zero |
| 1337 | * the cluster is doing zero. And he will clear unwritten after all |
| 1338 | * cluster io finished. */ |
| 1339 | list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) { |
| 1340 | if (desc->c_cpos == ue->ue_cpos) { |
| 1341 | BUG_ON(desc->c_new); |
| 1342 | desc->c_needs_zero = 0; |
| 1343 | desc->c_clear_unwritten = 0; |
| 1344 | goto unlock; |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | if (wc->w_type != OCFS2_WRITE_DIRECT) |
| 1349 | goto unlock; |
| 1350 | |
| 1351 | if (new == NULL) { |
| 1352 | spin_unlock(&oi->ip_lock); |
| 1353 | new = kmalloc(sizeof(struct ocfs2_unwritten_extent), |
| 1354 | GFP_NOFS); |
| 1355 | if (new == NULL) { |
| 1356 | ret = -ENOMEM; |
| 1357 | goto out; |
| 1358 | } |
| 1359 | goto retry; |
| 1360 | } |
| 1361 | /* This direct write will doing zero. */ |
| 1362 | new->ue_cpos = desc->c_cpos; |
| 1363 | new->ue_phys = desc->c_phys; |
| 1364 | desc->c_clear_unwritten = 0; |
| 1365 | list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list); |
| 1366 | list_add_tail(&new->ue_node, &wc->w_unwritten_list); |
| 1367 | new = NULL; |
| 1368 | unlock: |
| 1369 | spin_unlock(&oi->ip_lock); |
| 1370 | out: |
| 1371 | if (new) |
| 1372 | kfree(new); |
| 1373 | return ret; |
| 1374 | } |
| 1375 | |
| 1376 | /* |
| 1377 | * Populate each single-cluster write descriptor in the write context |
| 1378 | * with information about the i/o to be done. |
| 1379 | * |
| 1380 | * Returns the number of clusters that will have to be allocated, as |
| 1381 | * well as a worst case estimate of the number of extent records that |
| 1382 | * would have to be created during a write to an unwritten region. |
| 1383 | */ |
| 1384 | static int ocfs2_populate_write_desc(struct inode *inode, |
| 1385 | struct ocfs2_write_ctxt *wc, |
| 1386 | unsigned int *clusters_to_alloc, |
| 1387 | unsigned int *extents_to_split) |
| 1388 | { |
| 1389 | int ret; |
| 1390 | struct ocfs2_write_cluster_desc *desc; |
| 1391 | unsigned int num_clusters = 0; |
| 1392 | unsigned int ext_flags = 0; |
| 1393 | u32 phys = 0; |
| 1394 | int i; |
| 1395 | |
| 1396 | *clusters_to_alloc = 0; |
| 1397 | *extents_to_split = 0; |
| 1398 | |
| 1399 | for (i = 0; i < wc->w_clen; i++) { |
| 1400 | desc = &wc->w_desc[i]; |
| 1401 | desc->c_cpos = wc->w_cpos + i; |
| 1402 | |
| 1403 | if (num_clusters == 0) { |
| 1404 | /* |
| 1405 | * Need to look up the next extent record. |
| 1406 | */ |
| 1407 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
| 1408 | &num_clusters, &ext_flags); |
| 1409 | if (ret) { |
| 1410 | mlog_errno(ret); |
| 1411 | goto out; |
| 1412 | } |
| 1413 | |
| 1414 | /* We should already CoW the refcountd extent. */ |
| 1415 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); |
| 1416 | |
| 1417 | /* |
| 1418 | * Assume worst case - that we're writing in |
| 1419 | * the middle of the extent. |
| 1420 | * |
| 1421 | * We can assume that the write proceeds from |
| 1422 | * left to right, in which case the extent |
| 1423 | * insert code is smart enough to coalesce the |
| 1424 | * next splits into the previous records created. |
| 1425 | */ |
| 1426 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1427 | *extents_to_split = *extents_to_split + 2; |
| 1428 | } else if (phys) { |
| 1429 | /* |
| 1430 | * Only increment phys if it doesn't describe |
| 1431 | * a hole. |
| 1432 | */ |
| 1433 | phys++; |
| 1434 | } |
| 1435 | |
| 1436 | /* |
| 1437 | * If w_first_new_cpos is < UINT_MAX, we have a non-sparse |
| 1438 | * file that got extended. w_first_new_cpos tells us |
| 1439 | * where the newly allocated clusters are so we can |
| 1440 | * zero them. |
| 1441 | */ |
| 1442 | if (desc->c_cpos >= wc->w_first_new_cpos) { |
| 1443 | BUG_ON(phys == 0); |
| 1444 | desc->c_needs_zero = 1; |
| 1445 | } |
| 1446 | |
| 1447 | desc->c_phys = phys; |
| 1448 | if (phys == 0) { |
| 1449 | desc->c_new = 1; |
| 1450 | desc->c_needs_zero = 1; |
| 1451 | desc->c_clear_unwritten = 1; |
| 1452 | *clusters_to_alloc = *clusters_to_alloc + 1; |
| 1453 | } |
| 1454 | |
| 1455 | if (ext_flags & OCFS2_EXT_UNWRITTEN) { |
| 1456 | desc->c_clear_unwritten = 1; |
| 1457 | desc->c_needs_zero = 1; |
| 1458 | } |
| 1459 | |
| 1460 | ret = ocfs2_unwritten_check(inode, wc, desc); |
| 1461 | if (ret) { |
| 1462 | mlog_errno(ret); |
| 1463 | goto out; |
| 1464 | } |
| 1465 | |
| 1466 | num_clusters--; |
| 1467 | } |
| 1468 | |
| 1469 | ret = 0; |
| 1470 | out: |
| 1471 | return ret; |
| 1472 | } |
| 1473 | |
| 1474 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
| 1475 | struct inode *inode, |
| 1476 | struct ocfs2_write_ctxt *wc) |
| 1477 | { |
| 1478 | int ret; |
| 1479 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1480 | struct page *page; |
| 1481 | handle_t *handle; |
| 1482 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1483 | |
| 1484 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| 1485 | if (IS_ERR(handle)) { |
| 1486 | ret = PTR_ERR(handle); |
| 1487 | mlog_errno(ret); |
| 1488 | goto out; |
| 1489 | } |
| 1490 | |
| 1491 | page = find_or_create_page(mapping, 0, GFP_NOFS); |
| 1492 | if (!page) { |
| 1493 | ocfs2_commit_trans(osb, handle); |
| 1494 | ret = -ENOMEM; |
| 1495 | mlog_errno(ret); |
| 1496 | goto out; |
| 1497 | } |
| 1498 | /* |
| 1499 | * If we don't set w_num_pages then this page won't get unlocked |
| 1500 | * and freed on cleanup of the write context. |
| 1501 | */ |
| 1502 | wc->w_pages[0] = wc->w_target_page = page; |
| 1503 | wc->w_num_pages = 1; |
| 1504 | |
| 1505 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
| 1506 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1507 | if (ret) { |
| 1508 | ocfs2_commit_trans(osb, handle); |
| 1509 | |
| 1510 | mlog_errno(ret); |
| 1511 | goto out; |
| 1512 | } |
| 1513 | |
| 1514 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 1515 | ocfs2_set_inode_data_inline(inode, di); |
| 1516 | |
| 1517 | if (!PageUptodate(page)) { |
| 1518 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); |
| 1519 | if (ret) { |
| 1520 | ocfs2_commit_trans(osb, handle); |
| 1521 | |
| 1522 | goto out; |
| 1523 | } |
| 1524 | } |
| 1525 | |
| 1526 | wc->w_handle = handle; |
| 1527 | out: |
| 1528 | return ret; |
| 1529 | } |
| 1530 | |
| 1531 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) |
| 1532 | { |
| 1533 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 1534 | |
| 1535 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
| 1536 | return 1; |
| 1537 | return 0; |
| 1538 | } |
| 1539 | |
| 1540 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, |
| 1541 | struct inode *inode, loff_t pos, |
| 1542 | unsigned len, struct page *mmap_page, |
| 1543 | struct ocfs2_write_ctxt *wc) |
| 1544 | { |
| 1545 | int ret, written = 0; |
| 1546 | loff_t end = pos + len; |
| 1547 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1548 | struct ocfs2_dinode *di = NULL; |
| 1549 | |
| 1550 | trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, |
| 1551 | len, (unsigned long long)pos, |
| 1552 | oi->ip_dyn_features); |
| 1553 | |
| 1554 | /* |
| 1555 | * Handle inodes which already have inline data 1st. |
| 1556 | */ |
| 1557 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1558 | if (mmap_page == NULL && |
| 1559 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) |
| 1560 | goto do_inline_write; |
| 1561 | |
| 1562 | /* |
| 1563 | * The write won't fit - we have to give this inode an |
| 1564 | * inline extent list now. |
| 1565 | */ |
| 1566 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); |
| 1567 | if (ret) |
| 1568 | mlog_errno(ret); |
| 1569 | goto out; |
| 1570 | } |
| 1571 | |
| 1572 | /* |
| 1573 | * Check whether the inode can accept inline data. |
| 1574 | */ |
| 1575 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) |
| 1576 | return 0; |
| 1577 | |
| 1578 | /* |
| 1579 | * Check whether the write can fit. |
| 1580 | */ |
| 1581 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1582 | if (mmap_page || |
| 1583 | end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) |
| 1584 | return 0; |
| 1585 | |
| 1586 | do_inline_write: |
| 1587 | ret = ocfs2_write_begin_inline(mapping, inode, wc); |
| 1588 | if (ret) { |
| 1589 | mlog_errno(ret); |
| 1590 | goto out; |
| 1591 | } |
| 1592 | |
| 1593 | /* |
| 1594 | * This signals to the caller that the data can be written |
| 1595 | * inline. |
| 1596 | */ |
| 1597 | written = 1; |
| 1598 | out: |
| 1599 | return written ? written : ret; |
| 1600 | } |
| 1601 | |
| 1602 | /* |
| 1603 | * This function only does anything for file systems which can't |
| 1604 | * handle sparse files. |
| 1605 | * |
| 1606 | * What we want to do here is fill in any hole between the current end |
| 1607 | * of allocation and the end of our write. That way the rest of the |
| 1608 | * write path can treat it as an non-allocating write, which has no |
| 1609 | * special case code for sparse/nonsparse files. |
| 1610 | */ |
| 1611 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, |
| 1612 | struct buffer_head *di_bh, |
| 1613 | loff_t pos, unsigned len, |
| 1614 | struct ocfs2_write_ctxt *wc) |
| 1615 | { |
| 1616 | int ret; |
| 1617 | loff_t newsize = pos + len; |
| 1618 | |
| 1619 | BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
| 1620 | |
| 1621 | if (newsize <= i_size_read(inode)) |
| 1622 | return 0; |
| 1623 | |
| 1624 | ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); |
| 1625 | if (ret) |
| 1626 | mlog_errno(ret); |
| 1627 | |
| 1628 | /* There is no wc if this is call from direct. */ |
| 1629 | if (wc) |
| 1630 | wc->w_first_new_cpos = |
| 1631 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); |
| 1632 | |
| 1633 | return ret; |
| 1634 | } |
| 1635 | |
| 1636 | static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh, |
| 1637 | loff_t pos) |
| 1638 | { |
| 1639 | int ret = 0; |
| 1640 | |
| 1641 | BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
| 1642 | if (pos > i_size_read(inode)) |
| 1643 | ret = ocfs2_zero_extend(inode, di_bh, pos); |
| 1644 | |
| 1645 | return ret; |
| 1646 | } |
| 1647 | |
| 1648 | /* |
| 1649 | * Try to flush truncate logs if we can free enough clusters from it. |
| 1650 | * As for return value, "< 0" means error, "0" no space and "1" means |
| 1651 | * we have freed enough spaces and let the caller try to allocate again. |
| 1652 | */ |
| 1653 | static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb, |
| 1654 | unsigned int needed) |
| 1655 | { |
| 1656 | tid_t target; |
| 1657 | int ret = 0; |
| 1658 | unsigned int truncated_clusters; |
| 1659 | |
| 1660 | inode_lock(osb->osb_tl_inode); |
| 1661 | truncated_clusters = osb->truncated_clusters; |
| 1662 | inode_unlock(osb->osb_tl_inode); |
| 1663 | |
| 1664 | /* |
| 1665 | * Check whether we can succeed in allocating if we free |
| 1666 | * the truncate log. |
| 1667 | */ |
| 1668 | if (truncated_clusters < needed) |
| 1669 | goto out; |
| 1670 | |
| 1671 | ret = ocfs2_flush_truncate_log(osb); |
| 1672 | if (ret) { |
| 1673 | mlog_errno(ret); |
| 1674 | goto out; |
| 1675 | } |
| 1676 | |
| 1677 | if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) { |
| 1678 | jbd2_log_wait_commit(osb->journal->j_journal, target); |
| 1679 | ret = 1; |
| 1680 | } |
| 1681 | out: |
| 1682 | return ret; |
| 1683 | } |
| 1684 | |
| 1685 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
| 1686 | loff_t pos, unsigned len, ocfs2_write_type_t type, |
| 1687 | struct page **pagep, void **fsdata, |
| 1688 | struct buffer_head *di_bh, struct page *mmap_page) |
| 1689 | { |
| 1690 | int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
| 1691 | unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0; |
| 1692 | struct ocfs2_write_ctxt *wc; |
| 1693 | struct inode *inode = mapping->host; |
| 1694 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1695 | struct ocfs2_dinode *di; |
| 1696 | struct ocfs2_alloc_context *data_ac = NULL; |
| 1697 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 1698 | handle_t *handle; |
| 1699 | struct ocfs2_extent_tree et; |
| 1700 | int try_free = 1, ret1; |
| 1701 | |
| 1702 | try_again: |
| 1703 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, type, di_bh); |
| 1704 | if (ret) { |
| 1705 | mlog_errno(ret); |
| 1706 | return ret; |
| 1707 | } |
| 1708 | |
| 1709 | if (ocfs2_supports_inline_data(osb)) { |
| 1710 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, |
| 1711 | mmap_page, wc); |
| 1712 | if (ret == 1) { |
| 1713 | ret = 0; |
| 1714 | goto success; |
| 1715 | } |
| 1716 | if (ret < 0) { |
| 1717 | mlog_errno(ret); |
| 1718 | goto out; |
| 1719 | } |
| 1720 | } |
| 1721 | |
| 1722 | /* Direct io change i_size late, should not zero tail here. */ |
| 1723 | if (type != OCFS2_WRITE_DIRECT) { |
| 1724 | if (ocfs2_sparse_alloc(osb)) |
| 1725 | ret = ocfs2_zero_tail(inode, di_bh, pos); |
| 1726 | else |
| 1727 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, |
| 1728 | len, wc); |
| 1729 | if (ret) { |
| 1730 | mlog_errno(ret); |
| 1731 | goto out; |
| 1732 | } |
| 1733 | } |
| 1734 | |
| 1735 | ret = ocfs2_check_range_for_refcount(inode, pos, len); |
| 1736 | if (ret < 0) { |
| 1737 | mlog_errno(ret); |
| 1738 | goto out; |
| 1739 | } else if (ret == 1) { |
| 1740 | clusters_need = wc->w_clen; |
| 1741 | ret = ocfs2_refcount_cow(inode, di_bh, |
| 1742 | wc->w_cpos, wc->w_clen, UINT_MAX); |
| 1743 | if (ret) { |
| 1744 | mlog_errno(ret); |
| 1745 | goto out; |
| 1746 | } |
| 1747 | } |
| 1748 | |
| 1749 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
| 1750 | &extents_to_split); |
| 1751 | if (ret) { |
| 1752 | mlog_errno(ret); |
| 1753 | goto out; |
| 1754 | } |
| 1755 | clusters_need += clusters_to_alloc; |
| 1756 | |
| 1757 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1758 | |
| 1759 | trace_ocfs2_write_begin_nolock( |
| 1760 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1761 | (long long)i_size_read(inode), |
| 1762 | le32_to_cpu(di->i_clusters), |
| 1763 | pos, len, type, mmap_page, |
| 1764 | clusters_to_alloc, extents_to_split); |
| 1765 | |
| 1766 | /* |
| 1767 | * We set w_target_from, w_target_to here so that |
| 1768 | * ocfs2_write_end() knows which range in the target page to |
| 1769 | * write out. An allocation requires that we write the entire |
| 1770 | * cluster range. |
| 1771 | */ |
| 1772 | if (clusters_to_alloc || extents_to_split) { |
| 1773 | /* |
| 1774 | * XXX: We are stretching the limits of |
| 1775 | * ocfs2_lock_allocators(). It greatly over-estimates |
| 1776 | * the work to be done. |
| 1777 | */ |
| 1778 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
| 1779 | wc->w_di_bh); |
| 1780 | ret = ocfs2_lock_allocators(inode, &et, |
| 1781 | clusters_to_alloc, extents_to_split, |
| 1782 | &data_ac, &meta_ac); |
| 1783 | if (ret) { |
| 1784 | mlog_errno(ret); |
| 1785 | goto out; |
| 1786 | } |
| 1787 | |
| 1788 | if (data_ac) |
| 1789 | data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; |
| 1790 | |
| 1791 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
| 1792 | &di->id2.i_list); |
| 1793 | } else if (type == OCFS2_WRITE_DIRECT) |
| 1794 | /* direct write needs not to start trans if no extents alloc. */ |
| 1795 | goto success; |
| 1796 | |
| 1797 | /* |
| 1798 | * We have to zero sparse allocated clusters, unwritten extent clusters, |
| 1799 | * and non-sparse clusters we just extended. For non-sparse writes, |
| 1800 | * we know zeros will only be needed in the first and/or last cluster. |
| 1801 | */ |
| 1802 | if (wc->w_clen && (wc->w_desc[0].c_needs_zero || |
| 1803 | wc->w_desc[wc->w_clen - 1].c_needs_zero)) |
| 1804 | cluster_of_pages = 1; |
| 1805 | else |
| 1806 | cluster_of_pages = 0; |
| 1807 | |
| 1808 | ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); |
| 1809 | |
| 1810 | handle = ocfs2_start_trans(osb, credits); |
| 1811 | if (IS_ERR(handle)) { |
| 1812 | ret = PTR_ERR(handle); |
| 1813 | mlog_errno(ret); |
| 1814 | goto out; |
| 1815 | } |
| 1816 | |
| 1817 | wc->w_handle = handle; |
| 1818 | |
| 1819 | if (clusters_to_alloc) { |
| 1820 | ret = dquot_alloc_space_nodirty(inode, |
| 1821 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
| 1822 | if (ret) |
| 1823 | goto out_commit; |
| 1824 | } |
| 1825 | |
| 1826 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
| 1827 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1828 | if (ret) { |
| 1829 | mlog_errno(ret); |
| 1830 | goto out_quota; |
| 1831 | } |
| 1832 | |
| 1833 | /* |
| 1834 | * Fill our page array first. That way we've grabbed enough so |
| 1835 | * that we can zero and flush if we error after adding the |
| 1836 | * extent. |
| 1837 | */ |
| 1838 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len, |
| 1839 | cluster_of_pages, mmap_page); |
| 1840 | if (ret && ret != -EAGAIN) { |
| 1841 | mlog_errno(ret); |
| 1842 | goto out_quota; |
| 1843 | } |
| 1844 | |
| 1845 | /* |
| 1846 | * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock |
| 1847 | * the target page. In this case, we exit with no error and no target |
| 1848 | * page. This will trigger the caller, page_mkwrite(), to re-try |
| 1849 | * the operation. |
| 1850 | */ |
| 1851 | if (ret == -EAGAIN) { |
| 1852 | BUG_ON(wc->w_target_page); |
| 1853 | ret = 0; |
| 1854 | goto out_quota; |
| 1855 | } |
| 1856 | |
| 1857 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
| 1858 | len); |
| 1859 | if (ret) { |
| 1860 | mlog_errno(ret); |
| 1861 | goto out_quota; |
| 1862 | } |
| 1863 | |
| 1864 | if (data_ac) |
| 1865 | ocfs2_free_alloc_context(data_ac); |
| 1866 | if (meta_ac) |
| 1867 | ocfs2_free_alloc_context(meta_ac); |
| 1868 | |
| 1869 | success: |
| 1870 | if (pagep) |
| 1871 | *pagep = wc->w_target_page; |
| 1872 | *fsdata = wc; |
| 1873 | return 0; |
| 1874 | out_quota: |
| 1875 | if (clusters_to_alloc) |
| 1876 | dquot_free_space(inode, |
| 1877 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
| 1878 | out_commit: |
| 1879 | ocfs2_commit_trans(osb, handle); |
| 1880 | |
| 1881 | out: |
| 1882 | ocfs2_free_write_ctxt(inode, wc); |
| 1883 | |
| 1884 | if (data_ac) { |
| 1885 | ocfs2_free_alloc_context(data_ac); |
| 1886 | data_ac = NULL; |
| 1887 | } |
| 1888 | if (meta_ac) { |
| 1889 | ocfs2_free_alloc_context(meta_ac); |
| 1890 | meta_ac = NULL; |
| 1891 | } |
| 1892 | |
| 1893 | if (ret == -ENOSPC && try_free) { |
| 1894 | /* |
| 1895 | * Try to free some truncate log so that we can have enough |
| 1896 | * clusters to allocate. |
| 1897 | */ |
| 1898 | try_free = 0; |
| 1899 | |
| 1900 | ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need); |
| 1901 | if (ret1 == 1) |
| 1902 | goto try_again; |
| 1903 | |
| 1904 | if (ret1 < 0) |
| 1905 | mlog_errno(ret1); |
| 1906 | } |
| 1907 | |
| 1908 | return ret; |
| 1909 | } |
| 1910 | |
| 1911 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
| 1912 | loff_t pos, unsigned len, unsigned flags, |
| 1913 | struct page **pagep, void **fsdata) |
| 1914 | { |
| 1915 | int ret; |
| 1916 | struct buffer_head *di_bh = NULL; |
| 1917 | struct inode *inode = mapping->host; |
| 1918 | |
| 1919 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
| 1920 | if (ret) { |
| 1921 | mlog_errno(ret); |
| 1922 | return ret; |
| 1923 | } |
| 1924 | |
| 1925 | /* |
| 1926 | * Take alloc sem here to prevent concurrent lookups. That way |
| 1927 | * the mapping, zeroing and tree manipulation within |
| 1928 | * ocfs2_write() will be safe against ->readpage(). This |
| 1929 | * should also serve to lock out allocation from a shared |
| 1930 | * writeable region. |
| 1931 | */ |
| 1932 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1933 | |
| 1934 | ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_BUFFER, |
| 1935 | pagep, fsdata, di_bh, NULL); |
| 1936 | if (ret) { |
| 1937 | mlog_errno(ret); |
| 1938 | goto out_fail; |
| 1939 | } |
| 1940 | |
| 1941 | brelse(di_bh); |
| 1942 | |
| 1943 | return 0; |
| 1944 | |
| 1945 | out_fail: |
| 1946 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1947 | |
| 1948 | brelse(di_bh); |
| 1949 | ocfs2_inode_unlock(inode, 1); |
| 1950 | |
| 1951 | return ret; |
| 1952 | } |
| 1953 | |
| 1954 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
| 1955 | unsigned len, unsigned *copied, |
| 1956 | struct ocfs2_dinode *di, |
| 1957 | struct ocfs2_write_ctxt *wc) |
| 1958 | { |
| 1959 | void *kaddr; |
| 1960 | |
| 1961 | if (unlikely(*copied < len)) { |
| 1962 | if (!PageUptodate(wc->w_target_page)) { |
| 1963 | *copied = 0; |
| 1964 | return; |
| 1965 | } |
| 1966 | } |
| 1967 | |
| 1968 | kaddr = kmap_atomic(wc->w_target_page); |
| 1969 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); |
| 1970 | kunmap_atomic(kaddr); |
| 1971 | |
| 1972 | trace_ocfs2_write_end_inline( |
| 1973 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1974 | (unsigned long long)pos, *copied, |
| 1975 | le16_to_cpu(di->id2.i_data.id_count), |
| 1976 | le16_to_cpu(di->i_dyn_features)); |
| 1977 | } |
| 1978 | |
| 1979 | int ocfs2_write_end_nolock(struct address_space *mapping, |
| 1980 | loff_t pos, unsigned len, unsigned copied, |
| 1981 | struct page *page, void *fsdata) |
| 1982 | { |
| 1983 | int i, ret; |
| 1984 | unsigned from, to, start = pos & (PAGE_SIZE - 1); |
| 1985 | struct inode *inode = mapping->host; |
| 1986 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1987 | struct ocfs2_write_ctxt *wc = fsdata; |
| 1988 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1989 | handle_t *handle = wc->w_handle; |
| 1990 | struct page *tmppage; |
| 1991 | |
| 1992 | BUG_ON(!list_empty(&wc->w_unwritten_list)); |
| 1993 | |
| 1994 | if (handle) { |
| 1995 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), |
| 1996 | wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE); |
| 1997 | if (ret) { |
| 1998 | copied = ret; |
| 1999 | mlog_errno(ret); |
| 2000 | goto out; |
| 2001 | } |
| 2002 | } |
| 2003 | |
| 2004 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 2005 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); |
| 2006 | goto out_write_size; |
| 2007 | } |
| 2008 | |
| 2009 | if (unlikely(copied < len) && wc->w_target_page) { |
| 2010 | if (!PageUptodate(wc->w_target_page)) |
| 2011 | copied = 0; |
| 2012 | |
| 2013 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, |
| 2014 | start+len); |
| 2015 | } |
| 2016 | if (wc->w_target_page) |
| 2017 | flush_dcache_page(wc->w_target_page); |
| 2018 | |
| 2019 | for(i = 0; i < wc->w_num_pages; i++) { |
| 2020 | tmppage = wc->w_pages[i]; |
| 2021 | |
| 2022 | /* This is the direct io target page. */ |
| 2023 | if (tmppage == NULL) |
| 2024 | continue; |
| 2025 | |
| 2026 | if (tmppage == wc->w_target_page) { |
| 2027 | from = wc->w_target_from; |
| 2028 | to = wc->w_target_to; |
| 2029 | |
| 2030 | BUG_ON(from > PAGE_SIZE || |
| 2031 | to > PAGE_SIZE || |
| 2032 | to < from); |
| 2033 | } else { |
| 2034 | /* |
| 2035 | * Pages adjacent to the target (if any) imply |
| 2036 | * a hole-filling write in which case we want |
| 2037 | * to flush their entire range. |
| 2038 | */ |
| 2039 | from = 0; |
| 2040 | to = PAGE_SIZE; |
| 2041 | } |
| 2042 | |
| 2043 | if (page_has_buffers(tmppage)) { |
| 2044 | if (handle && ocfs2_should_order_data(inode)) |
| 2045 | ocfs2_jbd2_file_inode(handle, inode); |
| 2046 | block_commit_write(tmppage, from, to); |
| 2047 | } |
| 2048 | } |
| 2049 | |
| 2050 | out_write_size: |
| 2051 | /* Direct io do not update i_size here. */ |
| 2052 | if (wc->w_type != OCFS2_WRITE_DIRECT) { |
| 2053 | pos += copied; |
| 2054 | if (pos > i_size_read(inode)) { |
| 2055 | i_size_write(inode, pos); |
| 2056 | mark_inode_dirty(inode); |
| 2057 | } |
| 2058 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
| 2059 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
| 2060 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 2061 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
| 2062 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); |
| 2063 | ocfs2_update_inode_fsync_trans(handle, inode, 1); |
| 2064 | } |
| 2065 | if (handle) |
| 2066 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
| 2067 | |
| 2068 | out: |
| 2069 | /* unlock pages before dealloc since it needs acquiring j_trans_barrier |
| 2070 | * lock, or it will cause a deadlock since journal commit threads holds |
| 2071 | * this lock and will ask for the page lock when flushing the data. |
| 2072 | * put it here to preserve the unlock order. |
| 2073 | */ |
| 2074 | ocfs2_unlock_pages(wc); |
| 2075 | |
| 2076 | if (handle) |
| 2077 | ocfs2_commit_trans(osb, handle); |
| 2078 | |
| 2079 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
| 2080 | |
| 2081 | brelse(wc->w_di_bh); |
| 2082 | kfree(wc); |
| 2083 | |
| 2084 | return copied; |
| 2085 | } |
| 2086 | |
| 2087 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
| 2088 | loff_t pos, unsigned len, unsigned copied, |
| 2089 | struct page *page, void *fsdata) |
| 2090 | { |
| 2091 | int ret; |
| 2092 | struct inode *inode = mapping->host; |
| 2093 | |
| 2094 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); |
| 2095 | |
| 2096 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 2097 | ocfs2_inode_unlock(inode, 1); |
| 2098 | |
| 2099 | return ret; |
| 2100 | } |
| 2101 | |
| 2102 | struct ocfs2_dio_write_ctxt { |
| 2103 | struct list_head dw_zero_list; |
| 2104 | unsigned dw_zero_count; |
| 2105 | int dw_orphaned; |
| 2106 | pid_t dw_writer_pid; |
| 2107 | }; |
| 2108 | |
| 2109 | static struct ocfs2_dio_write_ctxt * |
| 2110 | ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc) |
| 2111 | { |
| 2112 | struct ocfs2_dio_write_ctxt *dwc = NULL; |
| 2113 | |
| 2114 | if (bh->b_private) |
| 2115 | return bh->b_private; |
| 2116 | |
| 2117 | dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS); |
| 2118 | if (dwc == NULL) |
| 2119 | return NULL; |
| 2120 | INIT_LIST_HEAD(&dwc->dw_zero_list); |
| 2121 | dwc->dw_zero_count = 0; |
| 2122 | dwc->dw_orphaned = 0; |
| 2123 | dwc->dw_writer_pid = task_pid_nr(current); |
| 2124 | bh->b_private = dwc; |
| 2125 | *alloc = 1; |
| 2126 | |
| 2127 | return dwc; |
| 2128 | } |
| 2129 | |
| 2130 | static void ocfs2_dio_free_write_ctx(struct inode *inode, |
| 2131 | struct ocfs2_dio_write_ctxt *dwc) |
| 2132 | { |
| 2133 | ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list); |
| 2134 | kfree(dwc); |
| 2135 | } |
| 2136 | |
| 2137 | /* |
| 2138 | * TODO: Make this into a generic get_blocks function. |
| 2139 | * |
| 2140 | * From do_direct_io in direct-io.c: |
| 2141 | * "So what we do is to permit the ->get_blocks function to populate |
| 2142 | * bh.b_size with the size of IO which is permitted at this offset and |
| 2143 | * this i_blkbits." |
| 2144 | * |
| 2145 | * This function is called directly from get_more_blocks in direct-io.c. |
| 2146 | * |
| 2147 | * called like this: dio->get_blocks(dio->inode, fs_startblk, |
| 2148 | * fs_count, map_bh, dio->rw == WRITE); |
| 2149 | */ |
| 2150 | static int ocfs2_dio_get_block(struct inode *inode, sector_t iblock, |
| 2151 | struct buffer_head *bh_result, int create) |
| 2152 | { |
| 2153 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 2154 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 2155 | struct ocfs2_write_ctxt *wc; |
| 2156 | struct ocfs2_write_cluster_desc *desc = NULL; |
| 2157 | struct ocfs2_dio_write_ctxt *dwc = NULL; |
| 2158 | struct buffer_head *di_bh = NULL; |
| 2159 | u64 p_blkno; |
| 2160 | loff_t pos = iblock << inode->i_sb->s_blocksize_bits; |
| 2161 | unsigned len, total_len = bh_result->b_size; |
| 2162 | int ret = 0, first_get_block = 0; |
| 2163 | |
| 2164 | len = osb->s_clustersize - (pos & (osb->s_clustersize - 1)); |
| 2165 | len = min(total_len, len); |
| 2166 | |
| 2167 | mlog(0, "get block of %lu at %llu:%u req %u\n", |
| 2168 | inode->i_ino, pos, len, total_len); |
| 2169 | |
| 2170 | /* |
| 2171 | * Because we need to change file size in ocfs2_dio_end_io_write(), or |
| 2172 | * we may need to add it to orphan dir. So can not fall to fast path |
| 2173 | * while file size will be changed. |
| 2174 | */ |
| 2175 | if (pos + total_len <= i_size_read(inode)) { |
| 2176 | down_read(&oi->ip_alloc_sem); |
| 2177 | /* This is the fast path for re-write. */ |
| 2178 | ret = ocfs2_get_block(inode, iblock, bh_result, create); |
| 2179 | |
| 2180 | up_read(&oi->ip_alloc_sem); |
| 2181 | |
| 2182 | if (buffer_mapped(bh_result) && |
| 2183 | !buffer_new(bh_result) && |
| 2184 | ret == 0) |
| 2185 | goto out; |
| 2186 | |
| 2187 | /* Clear state set by ocfs2_get_block. */ |
| 2188 | bh_result->b_state = 0; |
| 2189 | } |
| 2190 | |
| 2191 | dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block); |
| 2192 | if (unlikely(dwc == NULL)) { |
| 2193 | ret = -ENOMEM; |
| 2194 | mlog_errno(ret); |
| 2195 | goto out; |
| 2196 | } |
| 2197 | |
| 2198 | if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) > |
| 2199 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) && |
| 2200 | !dwc->dw_orphaned) { |
| 2201 | /* |
| 2202 | * when we are going to alloc extents beyond file size, add the |
| 2203 | * inode to orphan dir, so we can recall those spaces when |
| 2204 | * system crashed during write. |
| 2205 | */ |
| 2206 | ret = ocfs2_add_inode_to_orphan(osb, inode); |
| 2207 | if (ret < 0) { |
| 2208 | mlog_errno(ret); |
| 2209 | goto out; |
| 2210 | } |
| 2211 | dwc->dw_orphaned = 1; |
| 2212 | } |
| 2213 | |
| 2214 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
| 2215 | if (ret) { |
| 2216 | mlog_errno(ret); |
| 2217 | goto out; |
| 2218 | } |
| 2219 | |
| 2220 | down_write(&oi->ip_alloc_sem); |
| 2221 | |
| 2222 | if (first_get_block) { |
| 2223 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| 2224 | ret = ocfs2_zero_tail(inode, di_bh, pos); |
| 2225 | else |
| 2226 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, |
| 2227 | total_len, NULL); |
| 2228 | if (ret < 0) { |
| 2229 | mlog_errno(ret); |
| 2230 | goto unlock; |
| 2231 | } |
| 2232 | } |
| 2233 | |
| 2234 | ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len, |
| 2235 | OCFS2_WRITE_DIRECT, NULL, |
| 2236 | (void **)&wc, di_bh, NULL); |
| 2237 | if (ret) { |
| 2238 | mlog_errno(ret); |
| 2239 | goto unlock; |
| 2240 | } |
| 2241 | |
| 2242 | desc = &wc->w_desc[0]; |
| 2243 | |
| 2244 | p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys); |
| 2245 | BUG_ON(p_blkno == 0); |
| 2246 | p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1); |
| 2247 | |
| 2248 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 2249 | bh_result->b_size = len; |
| 2250 | if (desc->c_needs_zero) |
| 2251 | set_buffer_new(bh_result); |
| 2252 | |
| 2253 | /* May sleep in end_io. It should not happen in a irq context. So defer |
| 2254 | * it to dio work queue. */ |
| 2255 | set_buffer_defer_completion(bh_result); |
| 2256 | |
| 2257 | if (!list_empty(&wc->w_unwritten_list)) { |
| 2258 | struct ocfs2_unwritten_extent *ue = NULL; |
| 2259 | |
| 2260 | ue = list_first_entry(&wc->w_unwritten_list, |
| 2261 | struct ocfs2_unwritten_extent, |
| 2262 | ue_node); |
| 2263 | BUG_ON(ue->ue_cpos != desc->c_cpos); |
| 2264 | /* The physical address may be 0, fill it. */ |
| 2265 | ue->ue_phys = desc->c_phys; |
| 2266 | |
| 2267 | list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list); |
| 2268 | dwc->dw_zero_count++; |
| 2269 | } |
| 2270 | |
| 2271 | ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, NULL, wc); |
| 2272 | BUG_ON(ret != len); |
| 2273 | ret = 0; |
| 2274 | unlock: |
| 2275 | up_write(&oi->ip_alloc_sem); |
| 2276 | ocfs2_inode_unlock(inode, 1); |
| 2277 | brelse(di_bh); |
| 2278 | out: |
| 2279 | if (ret < 0) |
| 2280 | ret = -EIO; |
| 2281 | return ret; |
| 2282 | } |
| 2283 | |
| 2284 | static void ocfs2_dio_end_io_write(struct inode *inode, |
| 2285 | struct ocfs2_dio_write_ctxt *dwc, |
| 2286 | loff_t offset, |
| 2287 | ssize_t bytes) |
| 2288 | { |
| 2289 | struct ocfs2_cached_dealloc_ctxt dealloc; |
| 2290 | struct ocfs2_extent_tree et; |
| 2291 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 2292 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 2293 | struct ocfs2_unwritten_extent *ue = NULL; |
| 2294 | struct buffer_head *di_bh = NULL; |
| 2295 | struct ocfs2_dinode *di; |
| 2296 | struct ocfs2_alloc_context *data_ac = NULL; |
| 2297 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 2298 | handle_t *handle = NULL; |
| 2299 | loff_t end = offset + bytes; |
| 2300 | int ret = 0, credits = 0, locked = 0; |
| 2301 | |
| 2302 | ocfs2_init_dealloc_ctxt(&dealloc); |
| 2303 | |
| 2304 | /* We do clear unwritten, delete orphan, change i_size here. If neither |
| 2305 | * of these happen, we can skip all this. */ |
| 2306 | if (list_empty(&dwc->dw_zero_list) && |
| 2307 | end <= i_size_read(inode) && |
| 2308 | !dwc->dw_orphaned) |
| 2309 | goto out; |
| 2310 | |
| 2311 | /* ocfs2_file_write_iter will get i_mutex, so we need not lock if we |
| 2312 | * are in that context. */ |
| 2313 | if (dwc->dw_writer_pid != task_pid_nr(current)) { |
| 2314 | inode_lock(inode); |
| 2315 | locked = 1; |
| 2316 | } |
| 2317 | |
| 2318 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
| 2319 | if (ret < 0) { |
| 2320 | mlog_errno(ret); |
| 2321 | goto out; |
| 2322 | } |
| 2323 | |
| 2324 | down_write(&oi->ip_alloc_sem); |
| 2325 | |
| 2326 | /* Delete orphan before acquire i_mutex. */ |
| 2327 | if (dwc->dw_orphaned) { |
| 2328 | BUG_ON(dwc->dw_writer_pid != task_pid_nr(current)); |
| 2329 | |
| 2330 | end = end > i_size_read(inode) ? end : 0; |
| 2331 | |
| 2332 | ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, |
| 2333 | !!end, end); |
| 2334 | if (ret < 0) |
| 2335 | mlog_errno(ret); |
| 2336 | } |
| 2337 | |
| 2338 | di = (struct ocfs2_dinode *)di_bh; |
| 2339 | |
| 2340 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); |
| 2341 | |
| 2342 | ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2, |
| 2343 | &data_ac, &meta_ac); |
| 2344 | if (ret) { |
| 2345 | mlog_errno(ret); |
| 2346 | goto unlock; |
| 2347 | } |
| 2348 | |
| 2349 | credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list); |
| 2350 | |
| 2351 | handle = ocfs2_start_trans(osb, credits); |
| 2352 | if (IS_ERR(handle)) { |
| 2353 | ret = PTR_ERR(handle); |
| 2354 | mlog_errno(ret); |
| 2355 | goto unlock; |
| 2356 | } |
| 2357 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 2358 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 2359 | if (ret) { |
| 2360 | mlog_errno(ret); |
| 2361 | goto commit; |
| 2362 | } |
| 2363 | |
| 2364 | list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) { |
| 2365 | ret = ocfs2_mark_extent_written(inode, &et, handle, |
| 2366 | ue->ue_cpos, 1, |
| 2367 | ue->ue_phys, |
| 2368 | meta_ac, &dealloc); |
| 2369 | if (ret < 0) { |
| 2370 | mlog_errno(ret); |
| 2371 | break; |
| 2372 | } |
| 2373 | } |
| 2374 | |
| 2375 | if (end > i_size_read(inode)) { |
| 2376 | ret = ocfs2_set_inode_size(handle, inode, di_bh, end); |
| 2377 | if (ret < 0) |
| 2378 | mlog_errno(ret); |
| 2379 | } |
| 2380 | commit: |
| 2381 | ocfs2_commit_trans(osb, handle); |
| 2382 | unlock: |
| 2383 | up_write(&oi->ip_alloc_sem); |
| 2384 | ocfs2_inode_unlock(inode, 1); |
| 2385 | brelse(di_bh); |
| 2386 | out: |
| 2387 | if (data_ac) |
| 2388 | ocfs2_free_alloc_context(data_ac); |
| 2389 | if (meta_ac) |
| 2390 | ocfs2_free_alloc_context(meta_ac); |
| 2391 | ocfs2_run_deallocs(osb, &dealloc); |
| 2392 | if (locked) |
| 2393 | inode_unlock(inode); |
| 2394 | ocfs2_dio_free_write_ctx(inode, dwc); |
| 2395 | } |
| 2396 | |
| 2397 | /* |
| 2398 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
| 2399 | * particularly interested in the aio/dio case. We use the rw_lock DLM lock |
| 2400 | * to protect io on one node from truncation on another. |
| 2401 | */ |
| 2402 | static int ocfs2_dio_end_io(struct kiocb *iocb, |
| 2403 | loff_t offset, |
| 2404 | ssize_t bytes, |
| 2405 | void *private) |
| 2406 | { |
| 2407 | struct inode *inode = file_inode(iocb->ki_filp); |
| 2408 | int level; |
| 2409 | |
| 2410 | if (bytes <= 0) |
| 2411 | return 0; |
| 2412 | |
| 2413 | /* this io's submitter should not have unlocked this before we could */ |
| 2414 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
| 2415 | |
| 2416 | if (private) |
| 2417 | ocfs2_dio_end_io_write(inode, private, offset, bytes); |
| 2418 | |
| 2419 | ocfs2_iocb_clear_rw_locked(iocb); |
| 2420 | |
| 2421 | level = ocfs2_iocb_rw_locked_level(iocb); |
| 2422 | ocfs2_rw_unlock(inode, level); |
| 2423 | return 0; |
| 2424 | } |
| 2425 | |
| 2426 | static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
| 2427 | { |
| 2428 | struct file *file = iocb->ki_filp; |
| 2429 | struct inode *inode = file_inode(file)->i_mapping->host; |
| 2430 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 2431 | get_block_t *get_block; |
| 2432 | |
| 2433 | /* |
| 2434 | * Fallback to buffered I/O if we see an inode without |
| 2435 | * extents. |
| 2436 | */ |
| 2437 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 2438 | return 0; |
| 2439 | |
| 2440 | /* Fallback to buffered I/O if we do not support append dio. */ |
| 2441 | if (iocb->ki_pos + iter->count > i_size_read(inode) && |
| 2442 | !ocfs2_supports_append_dio(osb)) |
| 2443 | return 0; |
| 2444 | |
| 2445 | if (iov_iter_rw(iter) == READ) |
| 2446 | get_block = ocfs2_get_block; |
| 2447 | else |
| 2448 | get_block = ocfs2_dio_get_block; |
| 2449 | |
| 2450 | return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, |
| 2451 | iter, get_block, |
| 2452 | ocfs2_dio_end_io, NULL, 0); |
| 2453 | } |
| 2454 | |
| 2455 | const struct address_space_operations ocfs2_aops = { |
| 2456 | .readpage = ocfs2_readpage, |
| 2457 | .readpages = ocfs2_readpages, |
| 2458 | .writepage = ocfs2_writepage, |
| 2459 | .write_begin = ocfs2_write_begin, |
| 2460 | .write_end = ocfs2_write_end, |
| 2461 | .bmap = ocfs2_bmap, |
| 2462 | .direct_IO = ocfs2_direct_IO, |
| 2463 | .invalidatepage = block_invalidatepage, |
| 2464 | .releasepage = ocfs2_releasepage, |
| 2465 | .migratepage = buffer_migrate_page, |
| 2466 | .is_partially_uptodate = block_is_partially_uptodate, |
| 2467 | .error_remove_page = generic_error_remove_page, |
| 2468 | }; |