Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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> |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 27 | #include <linux/swap.h> |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 28 | #include <linux/pipe_fs_i.h> |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 29 | |
| 30 | #define MLOG_MASK_PREFIX ML_FILE_IO |
| 31 | #include <cluster/masklog.h> |
| 32 | |
| 33 | #include "ocfs2.h" |
| 34 | |
| 35 | #include "alloc.h" |
| 36 | #include "aops.h" |
| 37 | #include "dlmglue.h" |
| 38 | #include "extent_map.h" |
| 39 | #include "file.h" |
| 40 | #include "inode.h" |
| 41 | #include "journal.h" |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 42 | #include "suballoc.h" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 43 | #include "super.h" |
| 44 | #include "symlink.h" |
| 45 | |
| 46 | #include "buffer_head_io.h" |
| 47 | |
| 48 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, |
| 49 | struct buffer_head *bh_result, int create) |
| 50 | { |
| 51 | int err = -EIO; |
| 52 | int status; |
| 53 | struct ocfs2_dinode *fe = NULL; |
| 54 | struct buffer_head *bh = NULL; |
| 55 | struct buffer_head *buffer_cache_bh = NULL; |
| 56 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 57 | void *kaddr; |
| 58 | |
| 59 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, |
| 60 | (unsigned long long)iblock, bh_result, create); |
| 61 | |
| 62 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); |
| 63 | |
| 64 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { |
| 65 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", |
| 66 | (unsigned long long)iblock); |
| 67 | goto bail; |
| 68 | } |
| 69 | |
| 70 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), |
| 71 | OCFS2_I(inode)->ip_blkno, |
| 72 | &bh, OCFS2_BH_CACHED, inode); |
| 73 | if (status < 0) { |
| 74 | mlog_errno(status); |
| 75 | goto bail; |
| 76 | } |
| 77 | fe = (struct ocfs2_dinode *) bh->b_data; |
| 78 | |
| 79 | if (!OCFS2_IS_VALID_DINODE(fe)) { |
Mark Fasheh | b069705 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 80 | mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n", |
Mark Fasheh | 1ca1a11 | 2007-04-27 16:01:25 -0700 | [diff] [blame] | 81 | (unsigned long long)le64_to_cpu(fe->i_blkno), 7, |
| 82 | fe->i_signature); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 83 | goto bail; |
| 84 | } |
| 85 | |
| 86 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
| 87 | le32_to_cpu(fe->i_clusters))) { |
| 88 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
| 89 | "%llu\n", (unsigned long long)iblock); |
| 90 | goto bail; |
| 91 | } |
| 92 | |
| 93 | /* We don't use the page cache to create symlink data, so if |
| 94 | * need be, copy it over from the buffer cache. */ |
| 95 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { |
| 96 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + |
| 97 | iblock; |
| 98 | buffer_cache_bh = sb_getblk(osb->sb, blkno); |
| 99 | if (!buffer_cache_bh) { |
| 100 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
| 101 | goto bail; |
| 102 | } |
| 103 | |
| 104 | /* we haven't locked out transactions, so a commit |
| 105 | * could've happened. Since we've got a reference on |
| 106 | * the bh, even if it commits while we're doing the |
| 107 | * copy, the data is still good. */ |
| 108 | if (buffer_jbd(buffer_cache_bh) |
| 109 | && ocfs2_inode_is_new(inode)) { |
| 110 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); |
| 111 | if (!kaddr) { |
| 112 | mlog(ML_ERROR, "couldn't kmap!\n"); |
| 113 | goto bail; |
| 114 | } |
| 115 | memcpy(kaddr + (bh_result->b_size * iblock), |
| 116 | buffer_cache_bh->b_data, |
| 117 | bh_result->b_size); |
| 118 | kunmap_atomic(kaddr, KM_USER0); |
| 119 | set_buffer_uptodate(bh_result); |
| 120 | } |
| 121 | brelse(buffer_cache_bh); |
| 122 | } |
| 123 | |
| 124 | map_bh(bh_result, inode->i_sb, |
| 125 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); |
| 126 | |
| 127 | err = 0; |
| 128 | |
| 129 | bail: |
| 130 | if (bh) |
| 131 | brelse(bh); |
| 132 | |
| 133 | mlog_exit(err); |
| 134 | return err; |
| 135 | } |
| 136 | |
| 137 | static int ocfs2_get_block(struct inode *inode, sector_t iblock, |
| 138 | struct buffer_head *bh_result, int create) |
| 139 | { |
| 140 | int err = 0; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 141 | unsigned int ext_flags; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 142 | u64 p_blkno, past_eof; |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 143 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 144 | |
| 145 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, |
| 146 | (unsigned long long)iblock, bh_result, create); |
| 147 | |
| 148 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) |
| 149 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", |
| 150 | inode, inode->i_ino); |
| 151 | |
| 152 | if (S_ISLNK(inode->i_mode)) { |
| 153 | /* this always does I/O for some reason. */ |
| 154 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); |
| 155 | goto bail; |
| 156 | } |
| 157 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 158 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL, |
| 159 | &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 160 | if (err) { |
| 161 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " |
Mark Fasheh | b069705 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 162 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
| 163 | (unsigned long long)p_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 164 | goto bail; |
| 165 | } |
| 166 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 167 | /* |
| 168 | * ocfs2 never allocates in this function - the only time we |
| 169 | * need to use BH_New is when we're extending i_size on a file |
| 170 | * system which doesn't support holes, in which case BH_New |
| 171 | * allows block_prepare_write() to zero. |
| 172 | */ |
| 173 | mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb), |
| 174 | "ino %lu, iblock %llu\n", inode->i_ino, |
| 175 | (unsigned long long)iblock); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 176 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 177 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
| 178 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 179 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 180 | |
| 181 | if (!ocfs2_sparse_alloc(osb)) { |
| 182 | if (p_blkno == 0) { |
| 183 | err = -EIO; |
| 184 | mlog(ML_ERROR, |
| 185 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", |
| 186 | (unsigned long long)iblock, |
| 187 | (unsigned long long)p_blkno, |
| 188 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 189 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); |
| 190 | dump_stack(); |
| 191 | } |
| 192 | |
| 193 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
| 194 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, |
| 195 | (unsigned long long)past_eof); |
| 196 | |
| 197 | if (create && (iblock >= past_eof)) |
| 198 | set_buffer_new(bh_result); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 199 | } |
| 200 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 201 | bail: |
| 202 | if (err < 0) |
| 203 | err = -EIO; |
| 204 | |
| 205 | mlog_exit(err); |
| 206 | return err; |
| 207 | } |
| 208 | |
| 209 | static int ocfs2_readpage(struct file *file, struct page *page) |
| 210 | { |
| 211 | struct inode *inode = page->mapping->host; |
| 212 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 213 | int ret, unlock = 1; |
| 214 | |
| 215 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); |
| 216 | |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 217 | ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 218 | if (ret != 0) { |
| 219 | if (ret == AOP_TRUNCATED_PAGE) |
| 220 | unlock = 0; |
| 221 | mlog_errno(ret); |
| 222 | goto out; |
| 223 | } |
| 224 | |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 225 | if (down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem) == 0) { |
| 226 | ret = AOP_TRUNCATED_PAGE; |
| 227 | goto out_meta_unlock; |
| 228 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 229 | |
| 230 | /* |
| 231 | * i_size might have just been updated as we grabed the meta lock. We |
| 232 | * might now be discovering a truncate that hit on another node. |
| 233 | * block_read_full_page->get_block freaks out if it is asked to read |
| 234 | * beyond the end of a file, so we check here. Callers |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 235 | * (generic_file_read, vm_ops->fault) are clever enough to check i_size |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 236 | * and notice that the page they just read isn't needed. |
| 237 | * |
| 238 | * XXX sys_readahead() seems to get that wrong? |
| 239 | */ |
| 240 | if (start >= i_size_read(inode)) { |
Nate Diller | 5c3c6bb | 2007-05-10 22:56:01 -0700 | [diff] [blame] | 241 | zero_user_page(page, 0, PAGE_SIZE, KM_USER0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 242 | SetPageUptodate(page); |
| 243 | ret = 0; |
| 244 | goto out_alloc; |
| 245 | } |
| 246 | |
| 247 | ret = ocfs2_data_lock_with_page(inode, 0, page); |
| 248 | if (ret != 0) { |
| 249 | if (ret == AOP_TRUNCATED_PAGE) |
| 250 | unlock = 0; |
| 251 | mlog_errno(ret); |
| 252 | goto out_alloc; |
| 253 | } |
| 254 | |
| 255 | ret = block_read_full_page(page, ocfs2_get_block); |
| 256 | unlock = 0; |
| 257 | |
| 258 | ocfs2_data_unlock(inode, 0); |
| 259 | out_alloc: |
| 260 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 261 | out_meta_unlock: |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 262 | ocfs2_meta_unlock(inode, 0); |
| 263 | out: |
| 264 | if (unlock) |
| 265 | unlock_page(page); |
| 266 | mlog_exit(ret); |
| 267 | return ret; |
| 268 | } |
| 269 | |
| 270 | /* Note: Because we don't support holes, our allocation has |
| 271 | * already happened (allocation writes zeros to the file data) |
| 272 | * so we don't have to worry about ordered writes in |
| 273 | * ocfs2_writepage. |
| 274 | * |
| 275 | * ->writepage is called during the process of invalidating the page cache |
| 276 | * during blocked lock processing. It can't block on any cluster locks |
| 277 | * to during block mapping. It's relying on the fact that the block |
| 278 | * mapping can't have disappeared under the dirty pages that it is |
| 279 | * being asked to write back. |
| 280 | */ |
| 281 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) |
| 282 | { |
| 283 | int ret; |
| 284 | |
| 285 | mlog_entry("(0x%p)\n", page); |
| 286 | |
| 287 | ret = block_write_full_page(page, ocfs2_get_block, wbc); |
| 288 | |
| 289 | mlog_exit(ret); |
| 290 | |
| 291 | return ret; |
| 292 | } |
| 293 | |
Mark Fasheh | 5069120 | 2007-02-09 20:52:53 -0800 | [diff] [blame] | 294 | /* |
| 295 | * This is called from ocfs2_write_zero_page() which has handled it's |
| 296 | * own cluster locking and has ensured allocation exists for those |
| 297 | * blocks to be written. |
| 298 | */ |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 299 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
| 300 | unsigned from, unsigned to) |
| 301 | { |
| 302 | int ret; |
| 303 | |
| 304 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 305 | |
| 306 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
| 307 | |
| 308 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 309 | |
| 310 | return ret; |
| 311 | } |
| 312 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 313 | /* Taken from ext3. We don't necessarily need the full blown |
| 314 | * functionality yet, but IMHO it's better to cut and paste the whole |
| 315 | * thing so we can avoid introducing our own bugs (and easily pick up |
| 316 | * their fixes when they happen) --Mark */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 317 | int walk_page_buffers( handle_t *handle, |
| 318 | struct buffer_head *head, |
| 319 | unsigned from, |
| 320 | unsigned to, |
| 321 | int *partial, |
| 322 | int (*fn)( handle_t *handle, |
| 323 | struct buffer_head *bh)) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 324 | { |
| 325 | struct buffer_head *bh; |
| 326 | unsigned block_start, block_end; |
| 327 | unsigned blocksize = head->b_size; |
| 328 | int err, ret = 0; |
| 329 | struct buffer_head *next; |
| 330 | |
| 331 | for ( bh = head, block_start = 0; |
| 332 | ret == 0 && (bh != head || !block_start); |
| 333 | block_start = block_end, bh = next) |
| 334 | { |
| 335 | next = bh->b_this_page; |
| 336 | block_end = block_start + blocksize; |
| 337 | if (block_end <= from || block_start >= to) { |
| 338 | if (partial && !buffer_uptodate(bh)) |
| 339 | *partial = 1; |
| 340 | continue; |
| 341 | } |
| 342 | err = (*fn)(handle, bh); |
| 343 | if (!ret) |
| 344 | ret = err; |
| 345 | } |
| 346 | return ret; |
| 347 | } |
| 348 | |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 349 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 350 | struct page *page, |
| 351 | unsigned from, |
| 352 | unsigned to) |
| 353 | { |
| 354 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 355 | handle_t *handle = NULL; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 356 | int ret = 0; |
| 357 | |
Mark Fasheh | 65eff9c | 2006-10-09 17:26:22 -0700 | [diff] [blame] | 358 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 359 | if (!handle) { |
| 360 | ret = -ENOMEM; |
| 361 | mlog_errno(ret); |
| 362 | goto out; |
| 363 | } |
| 364 | |
| 365 | if (ocfs2_should_order_data(inode)) { |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 366 | ret = walk_page_buffers(handle, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 367 | page_buffers(page), |
| 368 | from, to, NULL, |
| 369 | ocfs2_journal_dirty_data); |
| 370 | if (ret < 0) |
| 371 | mlog_errno(ret); |
| 372 | } |
| 373 | out: |
| 374 | if (ret) { |
| 375 | if (handle) |
Mark Fasheh | 02dc1af | 2006-10-09 16:48:10 -0700 | [diff] [blame] | 376 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 377 | handle = ERR_PTR(ret); |
| 378 | } |
| 379 | return handle; |
| 380 | } |
| 381 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 382 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
| 383 | { |
| 384 | sector_t status; |
| 385 | u64 p_blkno = 0; |
| 386 | int err = 0; |
| 387 | struct inode *inode = mapping->host; |
| 388 | |
| 389 | mlog_entry("(block = %llu)\n", (unsigned long long)block); |
| 390 | |
| 391 | /* We don't need to lock journal system files, since they aren't |
| 392 | * accessed concurrently from multiple nodes. |
| 393 | */ |
| 394 | if (!INODE_JOURNAL(inode)) { |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 395 | err = ocfs2_meta_lock(inode, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 396 | if (err) { |
| 397 | if (err != -ENOENT) |
| 398 | mlog_errno(err); |
| 399 | goto bail; |
| 400 | } |
| 401 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 402 | } |
| 403 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 404 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 405 | |
| 406 | if (!INODE_JOURNAL(inode)) { |
| 407 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 408 | ocfs2_meta_unlock(inode, 0); |
| 409 | } |
| 410 | |
| 411 | if (err) { |
| 412 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", |
| 413 | (unsigned long long)block); |
| 414 | mlog_errno(err); |
| 415 | goto bail; |
| 416 | } |
| 417 | |
| 418 | |
| 419 | bail: |
| 420 | status = err ? 0 : p_blkno; |
| 421 | |
| 422 | mlog_exit((int)status); |
| 423 | |
| 424 | return status; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * TODO: Make this into a generic get_blocks function. |
| 429 | * |
| 430 | * From do_direct_io in direct-io.c: |
| 431 | * "So what we do is to permit the ->get_blocks function to populate |
| 432 | * bh.b_size with the size of IO which is permitted at this offset and |
| 433 | * this i_blkbits." |
| 434 | * |
| 435 | * This function is called directly from get_more_blocks in direct-io.c. |
| 436 | * |
| 437 | * called like this: dio->get_blocks(dio->inode, fs_startblk, |
| 438 | * fs_count, map_bh, dio->rw == WRITE); |
| 439 | */ |
| 440 | static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 441 | struct buffer_head *bh_result, int create) |
| 442 | { |
| 443 | int ret; |
Mark Fasheh | 4f902c3 | 2007-03-09 16:26:50 -0800 | [diff] [blame] | 444 | u64 p_blkno, inode_blocks, contig_blocks; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 445 | unsigned int ext_flags; |
Florin Malita | 184d7d2 | 2006-06-03 19:30:10 -0400 | [diff] [blame] | 446 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 447 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 448 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 449 | /* This function won't even be called if the request isn't all |
| 450 | * nicely aligned and of the right size, so there's no need |
| 451 | * for us to check any of that. */ |
| 452 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 453 | inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
Mark Fasheh | 564f8a3 | 2006-12-14 13:01:05 -0800 | [diff] [blame] | 454 | |
| 455 | /* |
| 456 | * Any write past EOF is not allowed because we'd be extending. |
| 457 | */ |
| 458 | if (create && (iblock + max_blocks) > inode_blocks) { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 459 | ret = -EIO; |
| 460 | goto bail; |
| 461 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 462 | |
| 463 | /* This figures out the size of the next contiguous block, and |
| 464 | * our logical offset */ |
Mark Fasheh | 363041a | 2007-01-17 12:31:35 -0800 | [diff] [blame] | 465 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 466 | &contig_blocks, &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 467 | if (ret) { |
| 468 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", |
| 469 | (unsigned long long)iblock); |
| 470 | ret = -EIO; |
| 471 | goto bail; |
| 472 | } |
| 473 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 474 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) { |
| 475 | ocfs2_error(inode->i_sb, |
| 476 | "Inode %llu has a hole at block %llu\n", |
| 477 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 478 | (unsigned long long)iblock); |
| 479 | ret = -EROFS; |
| 480 | goto bail; |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * get_more_blocks() expects us to describe a hole by clearing |
| 485 | * the mapped bit on bh_result(). |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 486 | * |
| 487 | * Consider an unwritten extent as a hole. |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 488 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 489 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 490 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 491 | else { |
| 492 | /* |
| 493 | * ocfs2_prepare_inode_for_write() should have caught |
| 494 | * the case where we'd be filling a hole and triggered |
| 495 | * a buffered write instead. |
| 496 | */ |
| 497 | if (create) { |
| 498 | ret = -EIO; |
| 499 | mlog_errno(ret); |
| 500 | goto bail; |
| 501 | } |
| 502 | |
| 503 | clear_buffer_mapped(bh_result); |
| 504 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 505 | |
| 506 | /* make sure we don't map more than max_blocks blocks here as |
| 507 | that's all the kernel will handle at this point. */ |
| 508 | if (max_blocks < contig_blocks) |
| 509 | contig_blocks = max_blocks; |
| 510 | bh_result->b_size = contig_blocks << blocksize_bits; |
| 511 | bail: |
| 512 | return ret; |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
| 517 | * particularly interested in the aio/dio case. Like the core uses |
| 518 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from |
| 519 | * truncation on another. |
| 520 | */ |
| 521 | static void ocfs2_dio_end_io(struct kiocb *iocb, |
| 522 | loff_t offset, |
| 523 | ssize_t bytes, |
| 524 | void *private) |
| 525 | { |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 526 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 527 | int level; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 528 | |
| 529 | /* this io's submitter should not have unlocked this before we could */ |
| 530 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 531 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 532 | ocfs2_iocb_clear_rw_locked(iocb); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 533 | |
| 534 | level = ocfs2_iocb_rw_locked_level(iocb); |
| 535 | if (!level) |
| 536 | up_read(&inode->i_alloc_sem); |
| 537 | ocfs2_rw_unlock(inode, level); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 538 | } |
| 539 | |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 540 | /* |
| 541 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen |
| 542 | * from ext3. PageChecked() bits have been removed as OCFS2 does not |
| 543 | * do journalled data. |
| 544 | */ |
| 545 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) |
| 546 | { |
| 547 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 548 | |
| 549 | journal_invalidatepage(journal, page, offset); |
| 550 | } |
| 551 | |
| 552 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
| 553 | { |
| 554 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 555 | |
| 556 | if (!page_has_buffers(page)) |
| 557 | return 0; |
| 558 | return journal_try_to_free_buffers(journal, page, wait); |
| 559 | } |
| 560 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 561 | static ssize_t ocfs2_direct_IO(int rw, |
| 562 | struct kiocb *iocb, |
| 563 | const struct iovec *iov, |
| 564 | loff_t offset, |
| 565 | unsigned long nr_segs) |
| 566 | { |
| 567 | struct file *file = iocb->ki_filp; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 568 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 569 | int ret; |
| 570 | |
| 571 | mlog_entry_void(); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 572 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 573 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
| 574 | /* |
| 575 | * We get PR data locks even for O_DIRECT. This |
| 576 | * allows concurrent O_DIRECT I/O but doesn't let |
| 577 | * O_DIRECT with extending and buffered zeroing writes |
| 578 | * race. If they did race then the buffered zeroing |
| 579 | * could be written back after the O_DIRECT I/O. It's |
| 580 | * one thing to tell people not to mix buffered and |
| 581 | * O_DIRECT writes, but expecting them to understand |
| 582 | * that file extension is also an implicit buffered |
| 583 | * write is too much. By getting the PR we force |
| 584 | * writeback of the buffered zeroing before |
| 585 | * proceeding. |
| 586 | */ |
| 587 | ret = ocfs2_data_lock(inode, 0); |
| 588 | if (ret < 0) { |
| 589 | mlog_errno(ret); |
| 590 | goto out; |
| 591 | } |
| 592 | ocfs2_data_unlock(inode, 0); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 593 | } |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 594 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 595 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
| 596 | inode->i_sb->s_bdev, iov, offset, |
| 597 | nr_segs, |
| 598 | ocfs2_direct_IO_get_blocks, |
| 599 | ocfs2_dio_end_io); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 600 | out: |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 601 | mlog_exit(ret); |
| 602 | return ret; |
| 603 | } |
| 604 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 605 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
| 606 | u32 cpos, |
| 607 | unsigned int *start, |
| 608 | unsigned int *end) |
| 609 | { |
| 610 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; |
| 611 | |
| 612 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { |
| 613 | unsigned int cpp; |
| 614 | |
| 615 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); |
| 616 | |
| 617 | cluster_start = cpos % cpp; |
| 618 | cluster_start = cluster_start << osb->s_clustersize_bits; |
| 619 | |
| 620 | cluster_end = cluster_start + osb->s_clustersize; |
| 621 | } |
| 622 | |
| 623 | BUG_ON(cluster_start > PAGE_SIZE); |
| 624 | BUG_ON(cluster_end > PAGE_SIZE); |
| 625 | |
| 626 | if (start) |
| 627 | *start = cluster_start; |
| 628 | if (end) |
| 629 | *end = cluster_end; |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * 'from' and 'to' are the region in the page to avoid zeroing. |
| 634 | * |
| 635 | * If pagesize > clustersize, this function will avoid zeroing outside |
| 636 | * of the cluster boundary. |
| 637 | * |
| 638 | * from == to == 0 is code for "zero the entire cluster region" |
| 639 | */ |
| 640 | static void ocfs2_clear_page_regions(struct page *page, |
| 641 | struct ocfs2_super *osb, u32 cpos, |
| 642 | unsigned from, unsigned to) |
| 643 | { |
| 644 | void *kaddr; |
| 645 | unsigned int cluster_start, cluster_end; |
| 646 | |
| 647 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); |
| 648 | |
| 649 | kaddr = kmap_atomic(page, KM_USER0); |
| 650 | |
| 651 | if (from || to) { |
| 652 | if (from > cluster_start) |
| 653 | memset(kaddr + cluster_start, 0, from - cluster_start); |
| 654 | if (to < cluster_end) |
| 655 | memset(kaddr + to, 0, cluster_end - to); |
| 656 | } else { |
| 657 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); |
| 658 | } |
| 659 | |
| 660 | kunmap_atomic(kaddr, KM_USER0); |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * Some of this taken from block_prepare_write(). We already have our |
| 665 | * mapping by now though, and the entire write will be allocating or |
| 666 | * it won't, so not much need to use BH_New. |
| 667 | * |
| 668 | * This will also skip zeroing, which is handled externally. |
| 669 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 670 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
| 671 | struct inode *inode, unsigned int from, |
| 672 | unsigned int to, int new) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 673 | { |
| 674 | int ret = 0; |
| 675 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; |
| 676 | unsigned int block_end, block_start; |
| 677 | unsigned int bsize = 1 << inode->i_blkbits; |
| 678 | |
| 679 | if (!page_has_buffers(page)) |
| 680 | create_empty_buffers(page, bsize, 0); |
| 681 | |
| 682 | head = page_buffers(page); |
| 683 | for (bh = head, block_start = 0; bh != head || !block_start; |
| 684 | bh = bh->b_this_page, block_start += bsize) { |
| 685 | block_end = block_start + bsize; |
| 686 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 687 | clear_buffer_new(bh); |
| 688 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 689 | /* |
| 690 | * Ignore blocks outside of our i/o range - |
| 691 | * they may belong to unallocated clusters. |
| 692 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 693 | if (block_start >= to || block_end <= from) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 694 | if (PageUptodate(page)) |
| 695 | set_buffer_uptodate(bh); |
| 696 | continue; |
| 697 | } |
| 698 | |
| 699 | /* |
| 700 | * For an allocating write with cluster size >= page |
| 701 | * size, we always write the entire page. |
| 702 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 703 | if (new) |
| 704 | set_buffer_new(bh); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 705 | |
| 706 | if (!buffer_mapped(bh)) { |
| 707 | map_bh(bh, inode->i_sb, *p_blkno); |
| 708 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 709 | } |
| 710 | |
| 711 | if (PageUptodate(page)) { |
| 712 | if (!buffer_uptodate(bh)) |
| 713 | set_buffer_uptodate(bh); |
| 714 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 715 | !buffer_new(bh) && |
| 716 | (block_start < from || block_end > to)) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 717 | ll_rw_block(READ, 1, &bh); |
| 718 | *wait_bh++=bh; |
| 719 | } |
| 720 | |
| 721 | *p_blkno = *p_blkno + 1; |
| 722 | } |
| 723 | |
| 724 | /* |
| 725 | * If we issued read requests - let them complete. |
| 726 | */ |
| 727 | while(wait_bh > wait) { |
| 728 | wait_on_buffer(*--wait_bh); |
| 729 | if (!buffer_uptodate(*wait_bh)) |
| 730 | ret = -EIO; |
| 731 | } |
| 732 | |
| 733 | if (ret == 0 || !new) |
| 734 | return ret; |
| 735 | |
| 736 | /* |
| 737 | * If we get -EIO above, zero out any newly allocated blocks |
| 738 | * to avoid exposing stale data. |
| 739 | */ |
| 740 | bh = head; |
| 741 | block_start = 0; |
| 742 | do { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 743 | block_end = block_start + bsize; |
| 744 | if (block_end <= from) |
| 745 | goto next_bh; |
| 746 | if (block_start >= to) |
| 747 | break; |
| 748 | |
Eric Sandeen | 54c57dc | 2007-06-20 17:15:10 -0700 | [diff] [blame] | 749 | zero_user_page(page, block_start, bh->b_size, KM_USER0); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 750 | set_buffer_uptodate(bh); |
| 751 | mark_buffer_dirty(bh); |
| 752 | |
| 753 | next_bh: |
| 754 | block_start = block_end; |
| 755 | bh = bh->b_this_page; |
| 756 | } while (bh != head); |
| 757 | |
| 758 | return ret; |
| 759 | } |
| 760 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 761 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
| 762 | #define OCFS2_MAX_CTXT_PAGES 1 |
| 763 | #else |
| 764 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) |
| 765 | #endif |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 766 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 767 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 768 | |
| 769 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 770 | * Describe the state of a single cluster to be written to. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 771 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 772 | struct ocfs2_write_cluster_desc { |
| 773 | u32 c_cpos; |
| 774 | u32 c_phys; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 775 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 776 | * Give this a unique field because c_phys eventually gets |
| 777 | * filled. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 778 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 779 | unsigned c_new; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 780 | unsigned c_unwritten; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 781 | }; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 782 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 783 | static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d) |
| 784 | { |
| 785 | return d->c_new || d->c_unwritten; |
| 786 | } |
| 787 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 788 | struct ocfs2_write_ctxt { |
| 789 | /* Logical cluster position / len of write */ |
| 790 | u32 w_cpos; |
| 791 | u32 w_clen; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 792 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 793 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 794 | |
| 795 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 796 | * This is true if page_size > cluster_size. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 797 | * |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 798 | * It triggers a set of special cases during write which might |
| 799 | * have to deal with allocating writes to partial pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 800 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 801 | unsigned int w_large_pages; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 802 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 803 | /* |
| 804 | * Pages involved in this write. |
| 805 | * |
| 806 | * w_target_page is the page being written to by the user. |
| 807 | * |
| 808 | * w_pages is an array of pages which always contains |
| 809 | * w_target_page, and in the case of an allocating write with |
| 810 | * page_size < cluster size, it will contain zero'd and mapped |
| 811 | * pages adjacent to w_target_page which need to be written |
| 812 | * out in so that future reads from that region will get |
| 813 | * zero's. |
| 814 | */ |
| 815 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
| 816 | unsigned int w_num_pages; |
| 817 | struct page *w_target_page; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 818 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 819 | /* |
| 820 | * ocfs2_write_end() uses this to know what the real range to |
| 821 | * write in the target should be. |
| 822 | */ |
| 823 | unsigned int w_target_from; |
| 824 | unsigned int w_target_to; |
| 825 | |
| 826 | /* |
| 827 | * We could use journal_current_handle() but this is cleaner, |
| 828 | * IMHO -Mark |
| 829 | */ |
| 830 | handle_t *w_handle; |
| 831 | |
| 832 | struct buffer_head *w_di_bh; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 833 | |
| 834 | struct ocfs2_cached_dealloc_ctxt w_dealloc; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 835 | }; |
| 836 | |
| 837 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) |
| 838 | { |
| 839 | int i; |
| 840 | |
| 841 | for(i = 0; i < wc->w_num_pages; i++) { |
| 842 | if (wc->w_pages[i] == NULL) |
| 843 | continue; |
| 844 | |
| 845 | unlock_page(wc->w_pages[i]); |
| 846 | mark_page_accessed(wc->w_pages[i]); |
| 847 | page_cache_release(wc->w_pages[i]); |
| 848 | } |
| 849 | |
| 850 | brelse(wc->w_di_bh); |
| 851 | kfree(wc); |
| 852 | } |
| 853 | |
| 854 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, |
| 855 | struct ocfs2_super *osb, loff_t pos, |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 856 | unsigned len, struct buffer_head *di_bh) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 857 | { |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 858 | u32 cend; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 859 | struct ocfs2_write_ctxt *wc; |
| 860 | |
| 861 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); |
| 862 | if (!wc) |
| 863 | return -ENOMEM; |
| 864 | |
| 865 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 866 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
| 867 | wc->w_clen = cend - wc->w_cpos + 1; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 868 | get_bh(di_bh); |
| 869 | wc->w_di_bh = di_bh; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 870 | |
| 871 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
| 872 | wc->w_large_pages = 1; |
| 873 | else |
| 874 | wc->w_large_pages = 0; |
| 875 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 876 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
| 877 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 878 | *wcp = wc; |
| 879 | |
| 880 | return 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 884 | * If a page has any new buffers, zero them out here, and mark them uptodate |
| 885 | * and dirty so they'll be written out (in order to prevent uninitialised |
| 886 | * block data from leaking). And clear the new bit. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 887 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 888 | static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 889 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 890 | unsigned int block_start, block_end; |
| 891 | struct buffer_head *head, *bh; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 892 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 893 | BUG_ON(!PageLocked(page)); |
| 894 | if (!page_has_buffers(page)) |
| 895 | return; |
| 896 | |
| 897 | bh = head = page_buffers(page); |
| 898 | block_start = 0; |
| 899 | do { |
| 900 | block_end = block_start + bh->b_size; |
| 901 | |
| 902 | if (buffer_new(bh)) { |
| 903 | if (block_end > from && block_start < to) { |
| 904 | if (!PageUptodate(page)) { |
| 905 | unsigned start, end; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 906 | |
| 907 | start = max(from, block_start); |
| 908 | end = min(to, block_end); |
| 909 | |
Eric Sandeen | 54c57dc | 2007-06-20 17:15:10 -0700 | [diff] [blame] | 910 | zero_user_page(page, start, end - start, KM_USER0); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 911 | set_buffer_uptodate(bh); |
| 912 | } |
| 913 | |
| 914 | clear_buffer_new(bh); |
| 915 | mark_buffer_dirty(bh); |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | block_start = block_end; |
| 920 | bh = bh->b_this_page; |
| 921 | } while (bh != head); |
| 922 | } |
| 923 | |
| 924 | /* |
| 925 | * Only called when we have a failure during allocating write to write |
| 926 | * zero's to the newly allocated region. |
| 927 | */ |
| 928 | static void ocfs2_write_failure(struct inode *inode, |
| 929 | struct ocfs2_write_ctxt *wc, |
| 930 | loff_t user_pos, unsigned user_len) |
| 931 | { |
| 932 | int i; |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame^] | 933 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
| 934 | to = user_pos + user_len; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 935 | struct page *tmppage; |
| 936 | |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame^] | 937 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 938 | |
| 939 | for(i = 0; i < wc->w_num_pages; i++) { |
| 940 | tmppage = wc->w_pages[i]; |
| 941 | |
| 942 | if (ocfs2_should_order_data(inode)) |
| 943 | walk_page_buffers(wc->w_handle, page_buffers(tmppage), |
| 944 | from, to, NULL, |
| 945 | ocfs2_journal_dirty_data); |
| 946 | |
| 947 | block_commit_write(tmppage, from, to); |
| 948 | } |
| 949 | } |
| 950 | |
| 951 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
| 952 | struct ocfs2_write_ctxt *wc, |
| 953 | struct page *page, u32 cpos, |
| 954 | loff_t user_pos, unsigned user_len, |
| 955 | int new) |
| 956 | { |
| 957 | int ret; |
| 958 | unsigned int map_from = 0, map_to = 0; |
| 959 | unsigned int cluster_start, cluster_end; |
| 960 | unsigned int user_data_from = 0, user_data_to = 0; |
| 961 | |
| 962 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 963 | &cluster_start, &cluster_end); |
| 964 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 965 | if (page == wc->w_target_page) { |
| 966 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); |
| 967 | map_to = map_from + user_len; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 968 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 969 | if (new) |
| 970 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 971 | cluster_start, cluster_end, |
| 972 | new); |
| 973 | else |
| 974 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 975 | map_from, map_to, new); |
| 976 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 977 | mlog_errno(ret); |
| 978 | goto out; |
| 979 | } |
| 980 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 981 | user_data_from = map_from; |
| 982 | user_data_to = map_to; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 983 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 984 | map_from = cluster_start; |
| 985 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 986 | } |
| 987 | } else { |
| 988 | /* |
| 989 | * If we haven't allocated the new page yet, we |
| 990 | * shouldn't be writing it out without copying user |
| 991 | * data. This is likely a math error from the caller. |
| 992 | */ |
| 993 | BUG_ON(!new); |
| 994 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 995 | map_from = cluster_start; |
| 996 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 997 | |
| 998 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 999 | cluster_start, cluster_end, new); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1000 | if (ret) { |
| 1001 | mlog_errno(ret); |
| 1002 | goto out; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | /* |
| 1007 | * Parts of newly allocated pages need to be zero'd. |
| 1008 | * |
| 1009 | * Above, we have also rewritten 'to' and 'from' - as far as |
| 1010 | * the rest of the function is concerned, the entire cluster |
| 1011 | * range inside of a page needs to be written. |
| 1012 | * |
| 1013 | * We can skip this if the page is up to date - it's already |
| 1014 | * been zero'd from being read in as a hole. |
| 1015 | */ |
| 1016 | if (new && !PageUptodate(page)) |
| 1017 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1018 | cpos, user_data_from, user_data_to); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1019 | |
| 1020 | flush_dcache_page(page); |
| 1021 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1022 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1023 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1024 | } |
| 1025 | |
| 1026 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1027 | * This function will only grab one clusters worth of pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1028 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1029 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
| 1030 | struct ocfs2_write_ctxt *wc, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1031 | u32 cpos, loff_t user_pos, int new, |
| 1032 | struct page *mmap_page) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1033 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1034 | int ret = 0, i; |
| 1035 | unsigned long start, target_index, index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1036 | struct inode *inode = mapping->host; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1037 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1038 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1039 | |
| 1040 | /* |
| 1041 | * Figure out how many pages we'll be manipulating here. For |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 1042 | * non allocating write, we just change the one |
| 1043 | * page. Otherwise, we'll need a whole clusters worth. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1044 | */ |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1045 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1046 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
| 1047 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1048 | } else { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1049 | wc->w_num_pages = 1; |
| 1050 | start = target_index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1051 | } |
| 1052 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1053 | for(i = 0; i < wc->w_num_pages; i++) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1054 | index = start + i; |
| 1055 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1056 | if (index == target_index && mmap_page) { |
| 1057 | /* |
| 1058 | * ocfs2_pagemkwrite() is a little different |
| 1059 | * and wants us to directly use the page |
| 1060 | * passed in. |
| 1061 | */ |
| 1062 | lock_page(mmap_page); |
| 1063 | |
| 1064 | if (mmap_page->mapping != mapping) { |
| 1065 | unlock_page(mmap_page); |
| 1066 | /* |
| 1067 | * Sanity check - the locking in |
| 1068 | * ocfs2_pagemkwrite() should ensure |
| 1069 | * that this code doesn't trigger. |
| 1070 | */ |
| 1071 | ret = -EINVAL; |
| 1072 | mlog_errno(ret); |
| 1073 | goto out; |
| 1074 | } |
| 1075 | |
| 1076 | page_cache_get(mmap_page); |
| 1077 | wc->w_pages[i] = mmap_page; |
| 1078 | } else { |
| 1079 | wc->w_pages[i] = find_or_create_page(mapping, index, |
| 1080 | GFP_NOFS); |
| 1081 | if (!wc->w_pages[i]) { |
| 1082 | ret = -ENOMEM; |
| 1083 | mlog_errno(ret); |
| 1084 | goto out; |
| 1085 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1086 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1087 | |
| 1088 | if (index == target_index) |
| 1089 | wc->w_target_page = wc->w_pages[i]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1090 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1091 | out: |
| 1092 | return ret; |
| 1093 | } |
| 1094 | |
| 1095 | /* |
| 1096 | * Prepare a single cluster for write one cluster into the file. |
| 1097 | */ |
| 1098 | static int ocfs2_write_cluster(struct address_space *mapping, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1099 | u32 phys, unsigned int unwritten, |
| 1100 | struct ocfs2_alloc_context *data_ac, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1101 | struct ocfs2_alloc_context *meta_ac, |
| 1102 | struct ocfs2_write_ctxt *wc, u32 cpos, |
| 1103 | loff_t user_pos, unsigned user_len) |
| 1104 | { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1105 | int ret, i, new, should_zero = 0; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1106 | u64 v_blkno, p_blkno; |
| 1107 | struct inode *inode = mapping->host; |
| 1108 | |
| 1109 | new = phys == 0 ? 1 : 0; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1110 | if (new || unwritten) |
| 1111 | should_zero = 1; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1112 | |
| 1113 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1114 | u32 tmp_pos; |
| 1115 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1116 | /* |
| 1117 | * This is safe to call with the page locks - it won't take |
| 1118 | * any additional semaphores or cluster locks. |
| 1119 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1120 | tmp_pos = cpos; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1121 | ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode, |
Mark Fasheh | 2ae99a6 | 2007-03-09 16:43:28 -0800 | [diff] [blame] | 1122 | &tmp_pos, 1, 0, wc->w_di_bh, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1123 | wc->w_handle, data_ac, |
| 1124 | meta_ac, NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1125 | /* |
| 1126 | * This shouldn't happen because we must have already |
| 1127 | * calculated the correct meta data allocation required. The |
| 1128 | * internal tree allocation code should know how to increase |
| 1129 | * transaction credits itself. |
| 1130 | * |
| 1131 | * If need be, we could handle -EAGAIN for a |
| 1132 | * RESTART_TRANS here. |
| 1133 | */ |
| 1134 | mlog_bug_on_msg(ret == -EAGAIN, |
| 1135 | "Inode %llu: EAGAIN return during allocation.\n", |
| 1136 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 1137 | if (ret < 0) { |
| 1138 | mlog_errno(ret); |
| 1139 | goto out; |
| 1140 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1141 | } else if (unwritten) { |
| 1142 | ret = ocfs2_mark_extent_written(inode, wc->w_di_bh, |
| 1143 | wc->w_handle, cpos, 1, phys, |
| 1144 | meta_ac, &wc->w_dealloc); |
| 1145 | if (ret < 0) { |
| 1146 | mlog_errno(ret); |
| 1147 | goto out; |
| 1148 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1149 | } |
| 1150 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1151 | if (should_zero) |
| 1152 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
| 1153 | else |
| 1154 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
| 1155 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1156 | /* |
| 1157 | * The only reason this should fail is due to an inability to |
| 1158 | * find the extent added. |
| 1159 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 1160 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
| 1161 | NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1162 | if (ret < 0) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1163 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
| 1164 | "at logical block %llu", |
| 1165 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1166 | (unsigned long long)v_blkno); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1167 | goto out; |
| 1168 | } |
| 1169 | |
| 1170 | BUG_ON(p_blkno == 0); |
| 1171 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1172 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1173 | int tmpret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1174 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1175 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
| 1176 | wc->w_pages[i], cpos, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1177 | user_pos, user_len, |
| 1178 | should_zero); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1179 | if (tmpret) { |
| 1180 | mlog_errno(tmpret); |
| 1181 | if (ret == 0) |
| 1182 | tmpret = ret; |
| 1183 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1184 | } |
| 1185 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1186 | /* |
| 1187 | * We only have cleanup to do in case of allocating write. |
| 1188 | */ |
| 1189 | if (ret && new) |
| 1190 | ocfs2_write_failure(inode, wc, user_pos, user_len); |
| 1191 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1192 | out: |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1193 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1194 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1195 | } |
| 1196 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1197 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
| 1198 | struct ocfs2_alloc_context *data_ac, |
| 1199 | struct ocfs2_alloc_context *meta_ac, |
| 1200 | struct ocfs2_write_ctxt *wc, |
| 1201 | loff_t pos, unsigned len) |
| 1202 | { |
| 1203 | int ret, i; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1204 | loff_t cluster_off; |
| 1205 | unsigned int local_len = len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1206 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1207 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1208 | |
| 1209 | for (i = 0; i < wc->w_clen; i++) { |
| 1210 | desc = &wc->w_desc[i]; |
| 1211 | |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1212 | /* |
| 1213 | * We have to make sure that the total write passed in |
| 1214 | * doesn't extend past a single cluster. |
| 1215 | */ |
| 1216 | local_len = len; |
| 1217 | cluster_off = pos & (osb->s_clustersize - 1); |
| 1218 | if ((cluster_off + local_len) > osb->s_clustersize) |
| 1219 | local_len = osb->s_clustersize - cluster_off; |
| 1220 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1221 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
| 1222 | desc->c_unwritten, data_ac, meta_ac, |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1223 | wc, desc->c_cpos, pos, local_len); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1224 | if (ret) { |
| 1225 | mlog_errno(ret); |
| 1226 | goto out; |
| 1227 | } |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1228 | |
| 1229 | len -= local_len; |
| 1230 | pos += local_len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | ret = 0; |
| 1234 | out: |
| 1235 | return ret; |
| 1236 | } |
| 1237 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1238 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1239 | * ocfs2_write_end() wants to know which parts of the target page it |
| 1240 | * should complete the write on. It's easiest to compute them ahead of |
| 1241 | * time when a more complete view of the write is available. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1242 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1243 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, |
| 1244 | struct ocfs2_write_ctxt *wc, |
| 1245 | loff_t pos, unsigned len, int alloc) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1246 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1247 | struct ocfs2_write_cluster_desc *desc; |
| 1248 | |
| 1249 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
| 1250 | wc->w_target_to = wc->w_target_from + len; |
| 1251 | |
| 1252 | if (alloc == 0) |
| 1253 | return; |
| 1254 | |
| 1255 | /* |
| 1256 | * Allocating write - we may have different boundaries based |
| 1257 | * on page size and cluster size. |
| 1258 | * |
| 1259 | * NOTE: We can no longer compute one value from the other as |
| 1260 | * the actual write length and user provided length may be |
| 1261 | * different. |
| 1262 | */ |
| 1263 | |
| 1264 | if (wc->w_large_pages) { |
| 1265 | /* |
| 1266 | * We only care about the 1st and last cluster within |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1267 | * our range and whether they should be zero'd or not. Either |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1268 | * value may be extended out to the start/end of a |
| 1269 | * newly allocated cluster. |
| 1270 | */ |
| 1271 | desc = &wc->w_desc[0]; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1272 | if (ocfs2_should_zero_cluster(desc)) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1273 | ocfs2_figure_cluster_boundaries(osb, |
| 1274 | desc->c_cpos, |
| 1275 | &wc->w_target_from, |
| 1276 | NULL); |
| 1277 | |
| 1278 | desc = &wc->w_desc[wc->w_clen - 1]; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1279 | if (ocfs2_should_zero_cluster(desc)) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1280 | ocfs2_figure_cluster_boundaries(osb, |
| 1281 | desc->c_cpos, |
| 1282 | NULL, |
| 1283 | &wc->w_target_to); |
| 1284 | } else { |
| 1285 | wc->w_target_from = 0; |
| 1286 | wc->w_target_to = PAGE_CACHE_SIZE; |
| 1287 | } |
| 1288 | } |
| 1289 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1290 | /* |
| 1291 | * Populate each single-cluster write descriptor in the write context |
| 1292 | * with information about the i/o to be done. |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1293 | * |
| 1294 | * Returns the number of clusters that will have to be allocated, as |
| 1295 | * well as a worst case estimate of the number of extent records that |
| 1296 | * would have to be created during a write to an unwritten region. |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1297 | */ |
| 1298 | static int ocfs2_populate_write_desc(struct inode *inode, |
| 1299 | struct ocfs2_write_ctxt *wc, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1300 | unsigned int *clusters_to_alloc, |
| 1301 | unsigned int *extents_to_split) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1302 | { |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1303 | int ret; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1304 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1305 | unsigned int num_clusters = 0; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1306 | unsigned int ext_flags = 0; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1307 | u32 phys = 0; |
| 1308 | int i; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1309 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1310 | *clusters_to_alloc = 0; |
| 1311 | *extents_to_split = 0; |
| 1312 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1313 | for (i = 0; i < wc->w_clen; i++) { |
| 1314 | desc = &wc->w_desc[i]; |
| 1315 | desc->c_cpos = wc->w_cpos + i; |
| 1316 | |
| 1317 | if (num_clusters == 0) { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1318 | /* |
| 1319 | * Need to look up the next extent record. |
| 1320 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1321 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1322 | &num_clusters, &ext_flags); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1323 | if (ret) { |
| 1324 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1325 | goto out; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1326 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1327 | |
| 1328 | /* |
| 1329 | * Assume worst case - that we're writing in |
| 1330 | * the middle of the extent. |
| 1331 | * |
| 1332 | * We can assume that the write proceeds from |
| 1333 | * left to right, in which case the extent |
| 1334 | * insert code is smart enough to coalesce the |
| 1335 | * next splits into the previous records created. |
| 1336 | */ |
| 1337 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1338 | *extents_to_split = *extents_to_split + 2; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1339 | } else if (phys) { |
| 1340 | /* |
| 1341 | * Only increment phys if it doesn't describe |
| 1342 | * a hole. |
| 1343 | */ |
| 1344 | phys++; |
| 1345 | } |
| 1346 | |
| 1347 | desc->c_phys = phys; |
| 1348 | if (phys == 0) { |
| 1349 | desc->c_new = 1; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1350 | *clusters_to_alloc = *clusters_to_alloc + 1; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1351 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1352 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1353 | desc->c_unwritten = 1; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1354 | |
| 1355 | num_clusters--; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1356 | } |
| 1357 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1358 | ret = 0; |
| 1359 | out: |
| 1360 | return ret; |
| 1361 | } |
| 1362 | |
| 1363 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
| 1364 | loff_t pos, unsigned len, unsigned flags, |
| 1365 | struct page **pagep, void **fsdata, |
| 1366 | struct buffer_head *di_bh, struct page *mmap_page) |
| 1367 | { |
| 1368 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1369 | unsigned int clusters_to_alloc, extents_to_split; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1370 | struct ocfs2_write_ctxt *wc; |
| 1371 | struct inode *inode = mapping->host; |
| 1372 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1373 | struct ocfs2_dinode *di; |
| 1374 | struct ocfs2_alloc_context *data_ac = NULL; |
| 1375 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 1376 | handle_t *handle; |
| 1377 | |
| 1378 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); |
| 1379 | if (ret) { |
| 1380 | mlog_errno(ret); |
| 1381 | return ret; |
| 1382 | } |
| 1383 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1384 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
| 1385 | &extents_to_split); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1386 | if (ret) { |
| 1387 | mlog_errno(ret); |
| 1388 | goto out; |
| 1389 | } |
| 1390 | |
| 1391 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1392 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1393 | /* |
| 1394 | * We set w_target_from, w_target_to here so that |
| 1395 | * ocfs2_write_end() knows which range in the target page to |
| 1396 | * write out. An allocation requires that we write the entire |
| 1397 | * cluster range. |
| 1398 | */ |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1399 | if (clusters_to_alloc || extents_to_split) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1400 | /* |
| 1401 | * XXX: We are stretching the limits of |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1402 | * ocfs2_lock_allocators(). It greatly over-estimates |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1403 | * the work to be done. |
| 1404 | */ |
| 1405 | ret = ocfs2_lock_allocators(inode, di, clusters_to_alloc, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1406 | extents_to_split, &data_ac, &meta_ac); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1407 | if (ret) { |
| 1408 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1409 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1410 | } |
| 1411 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1412 | credits = ocfs2_calc_extend_credits(inode->i_sb, di, |
| 1413 | clusters_to_alloc); |
| 1414 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1415 | } |
| 1416 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1417 | ocfs2_set_target_boundaries(osb, wc, pos, len, |
| 1418 | clusters_to_alloc + extents_to_split); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1419 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1420 | handle = ocfs2_start_trans(osb, credits); |
| 1421 | if (IS_ERR(handle)) { |
| 1422 | ret = PTR_ERR(handle); |
| 1423 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1424 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1425 | } |
| 1426 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1427 | wc->w_handle = handle; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1428 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1429 | /* |
| 1430 | * We don't want this to fail in ocfs2_write_end(), so do it |
| 1431 | * here. |
| 1432 | */ |
| 1433 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1434 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1435 | if (ret) { |
| 1436 | mlog_errno(ret); |
| 1437 | goto out_commit; |
| 1438 | } |
| 1439 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1440 | /* |
| 1441 | * Fill our page array first. That way we've grabbed enough so |
| 1442 | * that we can zero and flush if we error after adding the |
| 1443 | * extent. |
| 1444 | */ |
| 1445 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1446 | clusters_to_alloc + extents_to_split, |
| 1447 | mmap_page); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1448 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1449 | mlog_errno(ret); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1450 | goto out_commit; |
| 1451 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1452 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1453 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
| 1454 | len); |
| 1455 | if (ret) { |
| 1456 | mlog_errno(ret); |
| 1457 | goto out_commit; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1458 | } |
| 1459 | |
| 1460 | if (data_ac) |
| 1461 | ocfs2_free_alloc_context(data_ac); |
| 1462 | if (meta_ac) |
| 1463 | ocfs2_free_alloc_context(meta_ac); |
| 1464 | |
| 1465 | *pagep = wc->w_target_page; |
| 1466 | *fsdata = wc; |
| 1467 | return 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1468 | out_commit: |
| 1469 | ocfs2_commit_trans(osb, handle); |
| 1470 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1471 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1472 | ocfs2_free_write_ctxt(wc); |
| 1473 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1474 | if (data_ac) |
| 1475 | ocfs2_free_alloc_context(data_ac); |
| 1476 | if (meta_ac) |
| 1477 | ocfs2_free_alloc_context(meta_ac); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1478 | return ret; |
| 1479 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1480 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1481 | int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
| 1482 | loff_t pos, unsigned len, unsigned flags, |
| 1483 | struct page **pagep, void **fsdata) |
| 1484 | { |
| 1485 | int ret; |
| 1486 | struct buffer_head *di_bh = NULL; |
| 1487 | struct inode *inode = mapping->host; |
| 1488 | |
| 1489 | ret = ocfs2_meta_lock(inode, &di_bh, 1); |
| 1490 | if (ret) { |
| 1491 | mlog_errno(ret); |
| 1492 | return ret; |
| 1493 | } |
| 1494 | |
| 1495 | /* |
| 1496 | * Take alloc sem here to prevent concurrent lookups. That way |
| 1497 | * the mapping, zeroing and tree manipulation within |
| 1498 | * ocfs2_write() will be safe against ->readpage(). This |
| 1499 | * should also serve to lock out allocation from a shared |
| 1500 | * writeable region. |
| 1501 | */ |
| 1502 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1503 | |
| 1504 | ret = ocfs2_data_lock(inode, 1); |
| 1505 | if (ret) { |
| 1506 | mlog_errno(ret); |
| 1507 | goto out_fail; |
| 1508 | } |
| 1509 | |
| 1510 | ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1511 | fsdata, di_bh, NULL); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1512 | if (ret) { |
| 1513 | mlog_errno(ret); |
| 1514 | goto out_fail_data; |
| 1515 | } |
| 1516 | |
| 1517 | brelse(di_bh); |
| 1518 | |
| 1519 | return 0; |
| 1520 | |
| 1521 | out_fail_data: |
| 1522 | ocfs2_data_unlock(inode, 1); |
| 1523 | out_fail: |
| 1524 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1525 | |
| 1526 | brelse(di_bh); |
| 1527 | ocfs2_meta_unlock(inode, 1); |
| 1528 | |
| 1529 | return ret; |
| 1530 | } |
| 1531 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1532 | int ocfs2_write_end_nolock(struct address_space *mapping, |
| 1533 | loff_t pos, unsigned len, unsigned copied, |
| 1534 | struct page *page, void *fsdata) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1535 | { |
| 1536 | int i; |
| 1537 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); |
| 1538 | struct inode *inode = mapping->host; |
| 1539 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1540 | struct ocfs2_write_ctxt *wc = fsdata; |
| 1541 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1542 | handle_t *handle = wc->w_handle; |
| 1543 | struct page *tmppage; |
| 1544 | |
| 1545 | if (unlikely(copied < len)) { |
| 1546 | if (!PageUptodate(wc->w_target_page)) |
| 1547 | copied = 0; |
| 1548 | |
| 1549 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, |
| 1550 | start+len); |
| 1551 | } |
| 1552 | flush_dcache_page(wc->w_target_page); |
| 1553 | |
| 1554 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1555 | tmppage = wc->w_pages[i]; |
| 1556 | |
| 1557 | if (tmppage == wc->w_target_page) { |
| 1558 | from = wc->w_target_from; |
| 1559 | to = wc->w_target_to; |
| 1560 | |
| 1561 | BUG_ON(from > PAGE_CACHE_SIZE || |
| 1562 | to > PAGE_CACHE_SIZE || |
| 1563 | to < from); |
| 1564 | } else { |
| 1565 | /* |
| 1566 | * Pages adjacent to the target (if any) imply |
| 1567 | * a hole-filling write in which case we want |
| 1568 | * to flush their entire range. |
| 1569 | */ |
| 1570 | from = 0; |
| 1571 | to = PAGE_CACHE_SIZE; |
| 1572 | } |
| 1573 | |
| 1574 | if (ocfs2_should_order_data(inode)) |
| 1575 | walk_page_buffers(wc->w_handle, page_buffers(tmppage), |
| 1576 | from, to, NULL, |
| 1577 | ocfs2_journal_dirty_data); |
| 1578 | |
| 1579 | block_commit_write(tmppage, from, to); |
| 1580 | } |
| 1581 | |
| 1582 | pos += copied; |
| 1583 | if (pos > inode->i_size) { |
| 1584 | i_size_write(inode, pos); |
| 1585 | mark_inode_dirty(inode); |
| 1586 | } |
| 1587 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
| 1588 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
| 1589 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1590 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
| 1591 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1592 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
| 1593 | |
| 1594 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | 59a5e41 | 2007-06-22 15:52:36 -0700 | [diff] [blame] | 1595 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1596 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
| 1597 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1598 | ocfs2_free_write_ctxt(wc); |
| 1599 | |
| 1600 | return copied; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1601 | } |
| 1602 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1603 | int ocfs2_write_end(struct file *file, struct address_space *mapping, |
| 1604 | loff_t pos, unsigned len, unsigned copied, |
| 1605 | struct page *page, void *fsdata) |
| 1606 | { |
| 1607 | int ret; |
| 1608 | struct inode *inode = mapping->host; |
| 1609 | |
| 1610 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); |
| 1611 | |
| 1612 | ocfs2_data_unlock(inode, 1); |
| 1613 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1614 | ocfs2_meta_unlock(inode, 1); |
| 1615 | |
| 1616 | return ret; |
| 1617 | } |
| 1618 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1619 | const struct address_space_operations ocfs2_aops = { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1620 | .readpage = ocfs2_readpage, |
| 1621 | .writepage = ocfs2_writepage, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1622 | .bmap = ocfs2_bmap, |
| 1623 | .sync_page = block_sync_page, |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 1624 | .direct_IO = ocfs2_direct_IO, |
| 1625 | .invalidatepage = ocfs2_invalidatepage, |
| 1626 | .releasepage = ocfs2_releasepage, |
| 1627 | .migratepage = buffer_migrate_page, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1628 | }; |