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", |
| 81 | (unsigned long long)fe->i_blkno, 7, fe->i_signature); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 82 | goto bail; |
| 83 | } |
| 84 | |
| 85 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
| 86 | le32_to_cpu(fe->i_clusters))) { |
| 87 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
| 88 | "%llu\n", (unsigned long long)iblock); |
| 89 | goto bail; |
| 90 | } |
| 91 | |
| 92 | /* We don't use the page cache to create symlink data, so if |
| 93 | * need be, copy it over from the buffer cache. */ |
| 94 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { |
| 95 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + |
| 96 | iblock; |
| 97 | buffer_cache_bh = sb_getblk(osb->sb, blkno); |
| 98 | if (!buffer_cache_bh) { |
| 99 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
| 100 | goto bail; |
| 101 | } |
| 102 | |
| 103 | /* we haven't locked out transactions, so a commit |
| 104 | * could've happened. Since we've got a reference on |
| 105 | * the bh, even if it commits while we're doing the |
| 106 | * copy, the data is still good. */ |
| 107 | if (buffer_jbd(buffer_cache_bh) |
| 108 | && ocfs2_inode_is_new(inode)) { |
| 109 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); |
| 110 | if (!kaddr) { |
| 111 | mlog(ML_ERROR, "couldn't kmap!\n"); |
| 112 | goto bail; |
| 113 | } |
| 114 | memcpy(kaddr + (bh_result->b_size * iblock), |
| 115 | buffer_cache_bh->b_data, |
| 116 | bh_result->b_size); |
| 117 | kunmap_atomic(kaddr, KM_USER0); |
| 118 | set_buffer_uptodate(bh_result); |
| 119 | } |
| 120 | brelse(buffer_cache_bh); |
| 121 | } |
| 122 | |
| 123 | map_bh(bh_result, inode->i_sb, |
| 124 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); |
| 125 | |
| 126 | err = 0; |
| 127 | |
| 128 | bail: |
| 129 | if (bh) |
| 130 | brelse(bh); |
| 131 | |
| 132 | mlog_exit(err); |
| 133 | return err; |
| 134 | } |
| 135 | |
| 136 | static int ocfs2_get_block(struct inode *inode, sector_t iblock, |
| 137 | struct buffer_head *bh_result, int create) |
| 138 | { |
| 139 | int err = 0; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 140 | unsigned int ext_flags; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 141 | u64 p_blkno, past_eof; |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 142 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 143 | |
| 144 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, |
| 145 | (unsigned long long)iblock, bh_result, create); |
| 146 | |
| 147 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) |
| 148 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", |
| 149 | inode, inode->i_ino); |
| 150 | |
| 151 | if (S_ISLNK(inode->i_mode)) { |
| 152 | /* this always does I/O for some reason. */ |
| 153 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); |
| 154 | goto bail; |
| 155 | } |
| 156 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 157 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL, |
| 158 | &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 159 | if (err) { |
| 160 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " |
Mark Fasheh | b069705 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 161 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
| 162 | (unsigned long long)p_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 163 | goto bail; |
| 164 | } |
| 165 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 166 | /* |
| 167 | * ocfs2 never allocates in this function - the only time we |
| 168 | * need to use BH_New is when we're extending i_size on a file |
| 169 | * system which doesn't support holes, in which case BH_New |
| 170 | * allows block_prepare_write() to zero. |
| 171 | */ |
| 172 | mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb), |
| 173 | "ino %lu, iblock %llu\n", inode->i_ino, |
| 174 | (unsigned long long)iblock); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 175 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 176 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
| 177 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 178 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 179 | |
| 180 | if (!ocfs2_sparse_alloc(osb)) { |
| 181 | if (p_blkno == 0) { |
| 182 | err = -EIO; |
| 183 | mlog(ML_ERROR, |
| 184 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", |
| 185 | (unsigned long long)iblock, |
| 186 | (unsigned long long)p_blkno, |
| 187 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 188 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); |
| 189 | dump_stack(); |
| 190 | } |
| 191 | |
| 192 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
| 193 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, |
| 194 | (unsigned long long)past_eof); |
| 195 | |
| 196 | if (create && (iblock >= past_eof)) |
| 197 | set_buffer_new(bh_result); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 198 | } |
| 199 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 200 | bail: |
| 201 | if (err < 0) |
| 202 | err = -EIO; |
| 203 | |
| 204 | mlog_exit(err); |
| 205 | return err; |
| 206 | } |
| 207 | |
| 208 | static int ocfs2_readpage(struct file *file, struct page *page) |
| 209 | { |
| 210 | struct inode *inode = page->mapping->host; |
| 211 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 212 | int ret, unlock = 1; |
| 213 | |
| 214 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); |
| 215 | |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 216 | ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 217 | if (ret != 0) { |
| 218 | if (ret == AOP_TRUNCATED_PAGE) |
| 219 | unlock = 0; |
| 220 | mlog_errno(ret); |
| 221 | goto out; |
| 222 | } |
| 223 | |
| 224 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 225 | |
| 226 | /* |
| 227 | * i_size might have just been updated as we grabed the meta lock. We |
| 228 | * might now be discovering a truncate that hit on another node. |
| 229 | * block_read_full_page->get_block freaks out if it is asked to read |
| 230 | * beyond the end of a file, so we check here. Callers |
| 231 | * (generic_file_read, fault->nopage) are clever enough to check i_size |
| 232 | * and notice that the page they just read isn't needed. |
| 233 | * |
| 234 | * XXX sys_readahead() seems to get that wrong? |
| 235 | */ |
| 236 | if (start >= i_size_read(inode)) { |
| 237 | char *addr = kmap(page); |
| 238 | memset(addr, 0, PAGE_SIZE); |
| 239 | flush_dcache_page(page); |
| 240 | kunmap(page); |
| 241 | SetPageUptodate(page); |
| 242 | ret = 0; |
| 243 | goto out_alloc; |
| 244 | } |
| 245 | |
| 246 | ret = ocfs2_data_lock_with_page(inode, 0, page); |
| 247 | if (ret != 0) { |
| 248 | if (ret == AOP_TRUNCATED_PAGE) |
| 249 | unlock = 0; |
| 250 | mlog_errno(ret); |
| 251 | goto out_alloc; |
| 252 | } |
| 253 | |
| 254 | ret = block_read_full_page(page, ocfs2_get_block); |
| 255 | unlock = 0; |
| 256 | |
| 257 | ocfs2_data_unlock(inode, 0); |
| 258 | out_alloc: |
| 259 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 260 | ocfs2_meta_unlock(inode, 0); |
| 261 | out: |
| 262 | if (unlock) |
| 263 | unlock_page(page); |
| 264 | mlog_exit(ret); |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | /* Note: Because we don't support holes, our allocation has |
| 269 | * already happened (allocation writes zeros to the file data) |
| 270 | * so we don't have to worry about ordered writes in |
| 271 | * ocfs2_writepage. |
| 272 | * |
| 273 | * ->writepage is called during the process of invalidating the page cache |
| 274 | * during blocked lock processing. It can't block on any cluster locks |
| 275 | * to during block mapping. It's relying on the fact that the block |
| 276 | * mapping can't have disappeared under the dirty pages that it is |
| 277 | * being asked to write back. |
| 278 | */ |
| 279 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) |
| 280 | { |
| 281 | int ret; |
| 282 | |
| 283 | mlog_entry("(0x%p)\n", page); |
| 284 | |
| 285 | ret = block_write_full_page(page, ocfs2_get_block, wbc); |
| 286 | |
| 287 | mlog_exit(ret); |
| 288 | |
| 289 | return ret; |
| 290 | } |
| 291 | |
Mark Fasheh | 5069120 | 2007-02-09 20:52:53 -0800 | [diff] [blame] | 292 | /* |
| 293 | * This is called from ocfs2_write_zero_page() which has handled it's |
| 294 | * own cluster locking and has ensured allocation exists for those |
| 295 | * blocks to be written. |
| 296 | */ |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 297 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
| 298 | unsigned from, unsigned to) |
| 299 | { |
| 300 | int ret; |
| 301 | |
| 302 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 303 | |
| 304 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
| 305 | |
| 306 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 307 | |
| 308 | return ret; |
| 309 | } |
| 310 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 311 | /* Taken from ext3. We don't necessarily need the full blown |
| 312 | * functionality yet, but IMHO it's better to cut and paste the whole |
| 313 | * thing so we can avoid introducing our own bugs (and easily pick up |
| 314 | * their fixes when they happen) --Mark */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 315 | int walk_page_buffers( handle_t *handle, |
| 316 | struct buffer_head *head, |
| 317 | unsigned from, |
| 318 | unsigned to, |
| 319 | int *partial, |
| 320 | int (*fn)( handle_t *handle, |
| 321 | struct buffer_head *bh)) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 322 | { |
| 323 | struct buffer_head *bh; |
| 324 | unsigned block_start, block_end; |
| 325 | unsigned blocksize = head->b_size; |
| 326 | int err, ret = 0; |
| 327 | struct buffer_head *next; |
| 328 | |
| 329 | for ( bh = head, block_start = 0; |
| 330 | ret == 0 && (bh != head || !block_start); |
| 331 | block_start = block_end, bh = next) |
| 332 | { |
| 333 | next = bh->b_this_page; |
| 334 | block_end = block_start + blocksize; |
| 335 | if (block_end <= from || block_start >= to) { |
| 336 | if (partial && !buffer_uptodate(bh)) |
| 337 | *partial = 1; |
| 338 | continue; |
| 339 | } |
| 340 | err = (*fn)(handle, bh); |
| 341 | if (!ret) |
| 342 | ret = err; |
| 343 | } |
| 344 | return ret; |
| 345 | } |
| 346 | |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 347 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 348 | struct page *page, |
| 349 | unsigned from, |
| 350 | unsigned to) |
| 351 | { |
| 352 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 353 | handle_t *handle = NULL; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 354 | int ret = 0; |
| 355 | |
Mark Fasheh | 65eff9c | 2006-10-09 17:26:22 -0700 | [diff] [blame] | 356 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 357 | if (!handle) { |
| 358 | ret = -ENOMEM; |
| 359 | mlog_errno(ret); |
| 360 | goto out; |
| 361 | } |
| 362 | |
| 363 | if (ocfs2_should_order_data(inode)) { |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 364 | ret = walk_page_buffers(handle, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 365 | page_buffers(page), |
| 366 | from, to, NULL, |
| 367 | ocfs2_journal_dirty_data); |
| 368 | if (ret < 0) |
| 369 | mlog_errno(ret); |
| 370 | } |
| 371 | out: |
| 372 | if (ret) { |
| 373 | if (handle) |
Mark Fasheh | 02dc1af | 2006-10-09 16:48:10 -0700 | [diff] [blame] | 374 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 375 | handle = ERR_PTR(ret); |
| 376 | } |
| 377 | return handle; |
| 378 | } |
| 379 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 380 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
| 381 | { |
| 382 | sector_t status; |
| 383 | u64 p_blkno = 0; |
| 384 | int err = 0; |
| 385 | struct inode *inode = mapping->host; |
| 386 | |
| 387 | mlog_entry("(block = %llu)\n", (unsigned long long)block); |
| 388 | |
| 389 | /* We don't need to lock journal system files, since they aren't |
| 390 | * accessed concurrently from multiple nodes. |
| 391 | */ |
| 392 | if (!INODE_JOURNAL(inode)) { |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 393 | err = ocfs2_meta_lock(inode, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 394 | if (err) { |
| 395 | if (err != -ENOENT) |
| 396 | mlog_errno(err); |
| 397 | goto bail; |
| 398 | } |
| 399 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 400 | } |
| 401 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 402 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 403 | |
| 404 | if (!INODE_JOURNAL(inode)) { |
| 405 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 406 | ocfs2_meta_unlock(inode, 0); |
| 407 | } |
| 408 | |
| 409 | if (err) { |
| 410 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", |
| 411 | (unsigned long long)block); |
| 412 | mlog_errno(err); |
| 413 | goto bail; |
| 414 | } |
| 415 | |
| 416 | |
| 417 | bail: |
| 418 | status = err ? 0 : p_blkno; |
| 419 | |
| 420 | mlog_exit((int)status); |
| 421 | |
| 422 | return status; |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * TODO: Make this into a generic get_blocks function. |
| 427 | * |
| 428 | * From do_direct_io in direct-io.c: |
| 429 | * "So what we do is to permit the ->get_blocks function to populate |
| 430 | * bh.b_size with the size of IO which is permitted at this offset and |
| 431 | * this i_blkbits." |
| 432 | * |
| 433 | * This function is called directly from get_more_blocks in direct-io.c. |
| 434 | * |
| 435 | * called like this: dio->get_blocks(dio->inode, fs_startblk, |
| 436 | * fs_count, map_bh, dio->rw == WRITE); |
| 437 | */ |
| 438 | 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] | 439 | struct buffer_head *bh_result, int create) |
| 440 | { |
| 441 | int ret; |
Mark Fasheh | 564f8a3 | 2006-12-14 13:01:05 -0800 | [diff] [blame] | 442 | u64 p_blkno, inode_blocks; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 443 | int contig_blocks; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 444 | unsigned int ext_flags; |
Florin Malita | 184d7d2 | 2006-06-03 19:30:10 -0400 | [diff] [blame] | 445 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 446 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 447 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 448 | /* This function won't even be called if the request isn't all |
| 449 | * nicely aligned and of the right size, so there's no need |
| 450 | * for us to check any of that. */ |
| 451 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 452 | 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] | 453 | |
| 454 | /* |
| 455 | * Any write past EOF is not allowed because we'd be extending. |
| 456 | */ |
| 457 | if (create && (iblock + max_blocks) > inode_blocks) { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 458 | ret = -EIO; |
| 459 | goto bail; |
| 460 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 461 | |
| 462 | /* This figures out the size of the next contiguous block, and |
| 463 | * our logical offset */ |
Mark Fasheh | 363041a | 2007-01-17 12:31:35 -0800 | [diff] [blame] | 464 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 465 | &contig_blocks, &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 466 | if (ret) { |
| 467 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", |
| 468 | (unsigned long long)iblock); |
| 469 | ret = -EIO; |
| 470 | goto bail; |
| 471 | } |
| 472 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 473 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) { |
| 474 | ocfs2_error(inode->i_sb, |
| 475 | "Inode %llu has a hole at block %llu\n", |
| 476 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 477 | (unsigned long long)iblock); |
| 478 | ret = -EROFS; |
| 479 | goto bail; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * get_more_blocks() expects us to describe a hole by clearing |
| 484 | * the mapped bit on bh_result(). |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 485 | * |
| 486 | * Consider an unwritten extent as a hole. |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 487 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 488 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 489 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 490 | else { |
| 491 | /* |
| 492 | * ocfs2_prepare_inode_for_write() should have caught |
| 493 | * the case where we'd be filling a hole and triggered |
| 494 | * a buffered write instead. |
| 495 | */ |
| 496 | if (create) { |
| 497 | ret = -EIO; |
| 498 | mlog_errno(ret); |
| 499 | goto bail; |
| 500 | } |
| 501 | |
| 502 | clear_buffer_mapped(bh_result); |
| 503 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 504 | |
| 505 | /* make sure we don't map more than max_blocks blocks here as |
| 506 | that's all the kernel will handle at this point. */ |
| 507 | if (max_blocks < contig_blocks) |
| 508 | contig_blocks = max_blocks; |
| 509 | bh_result->b_size = contig_blocks << blocksize_bits; |
| 510 | bail: |
| 511 | return ret; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
| 516 | * particularly interested in the aio/dio case. Like the core uses |
| 517 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from |
| 518 | * truncation on another. |
| 519 | */ |
| 520 | static void ocfs2_dio_end_io(struct kiocb *iocb, |
| 521 | loff_t offset, |
| 522 | ssize_t bytes, |
| 523 | void *private) |
| 524 | { |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 525 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 526 | |
| 527 | /* this io's submitter should not have unlocked this before we could */ |
| 528 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
| 529 | ocfs2_iocb_clear_rw_locked(iocb); |
| 530 | up_read(&inode->i_alloc_sem); |
| 531 | ocfs2_rw_unlock(inode, 0); |
| 532 | } |
| 533 | |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 534 | /* |
| 535 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen |
| 536 | * from ext3. PageChecked() bits have been removed as OCFS2 does not |
| 537 | * do journalled data. |
| 538 | */ |
| 539 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) |
| 540 | { |
| 541 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 542 | |
| 543 | journal_invalidatepage(journal, page, offset); |
| 544 | } |
| 545 | |
| 546 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
| 547 | { |
| 548 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 549 | |
| 550 | if (!page_has_buffers(page)) |
| 551 | return 0; |
| 552 | return journal_try_to_free_buffers(journal, page, wait); |
| 553 | } |
| 554 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 555 | static ssize_t ocfs2_direct_IO(int rw, |
| 556 | struct kiocb *iocb, |
| 557 | const struct iovec *iov, |
| 558 | loff_t offset, |
| 559 | unsigned long nr_segs) |
| 560 | { |
| 561 | struct file *file = iocb->ki_filp; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 562 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 563 | int ret; |
| 564 | |
| 565 | mlog_entry_void(); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 566 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 567 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) { |
| 568 | /* |
| 569 | * We get PR data locks even for O_DIRECT. This |
| 570 | * allows concurrent O_DIRECT I/O but doesn't let |
| 571 | * O_DIRECT with extending and buffered zeroing writes |
| 572 | * race. If they did race then the buffered zeroing |
| 573 | * could be written back after the O_DIRECT I/O. It's |
| 574 | * one thing to tell people not to mix buffered and |
| 575 | * O_DIRECT writes, but expecting them to understand |
| 576 | * that file extension is also an implicit buffered |
| 577 | * write is too much. By getting the PR we force |
| 578 | * writeback of the buffered zeroing before |
| 579 | * proceeding. |
| 580 | */ |
| 581 | ret = ocfs2_data_lock(inode, 0); |
| 582 | if (ret < 0) { |
| 583 | mlog_errno(ret); |
| 584 | goto out; |
| 585 | } |
| 586 | ocfs2_data_unlock(inode, 0); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 587 | } |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 588 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 589 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
| 590 | inode->i_sb->s_bdev, iov, offset, |
| 591 | nr_segs, |
| 592 | ocfs2_direct_IO_get_blocks, |
| 593 | ocfs2_dio_end_io); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 594 | out: |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 595 | mlog_exit(ret); |
| 596 | return ret; |
| 597 | } |
| 598 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 599 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
| 600 | u32 cpos, |
| 601 | unsigned int *start, |
| 602 | unsigned int *end) |
| 603 | { |
| 604 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; |
| 605 | |
| 606 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { |
| 607 | unsigned int cpp; |
| 608 | |
| 609 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); |
| 610 | |
| 611 | cluster_start = cpos % cpp; |
| 612 | cluster_start = cluster_start << osb->s_clustersize_bits; |
| 613 | |
| 614 | cluster_end = cluster_start + osb->s_clustersize; |
| 615 | } |
| 616 | |
| 617 | BUG_ON(cluster_start > PAGE_SIZE); |
| 618 | BUG_ON(cluster_end > PAGE_SIZE); |
| 619 | |
| 620 | if (start) |
| 621 | *start = cluster_start; |
| 622 | if (end) |
| 623 | *end = cluster_end; |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * 'from' and 'to' are the region in the page to avoid zeroing. |
| 628 | * |
| 629 | * If pagesize > clustersize, this function will avoid zeroing outside |
| 630 | * of the cluster boundary. |
| 631 | * |
| 632 | * from == to == 0 is code for "zero the entire cluster region" |
| 633 | */ |
| 634 | static void ocfs2_clear_page_regions(struct page *page, |
| 635 | struct ocfs2_super *osb, u32 cpos, |
| 636 | unsigned from, unsigned to) |
| 637 | { |
| 638 | void *kaddr; |
| 639 | unsigned int cluster_start, cluster_end; |
| 640 | |
| 641 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); |
| 642 | |
| 643 | kaddr = kmap_atomic(page, KM_USER0); |
| 644 | |
| 645 | if (from || to) { |
| 646 | if (from > cluster_start) |
| 647 | memset(kaddr + cluster_start, 0, from - cluster_start); |
| 648 | if (to < cluster_end) |
| 649 | memset(kaddr + to, 0, cluster_end - to); |
| 650 | } else { |
| 651 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); |
| 652 | } |
| 653 | |
| 654 | kunmap_atomic(kaddr, KM_USER0); |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Some of this taken from block_prepare_write(). We already have our |
| 659 | * mapping by now though, and the entire write will be allocating or |
| 660 | * it won't, so not much need to use BH_New. |
| 661 | * |
| 662 | * This will also skip zeroing, which is handled externally. |
| 663 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 664 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
| 665 | struct inode *inode, unsigned int from, |
| 666 | unsigned int to, int new) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 667 | { |
| 668 | int ret = 0; |
| 669 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; |
| 670 | unsigned int block_end, block_start; |
| 671 | unsigned int bsize = 1 << inode->i_blkbits; |
| 672 | |
| 673 | if (!page_has_buffers(page)) |
| 674 | create_empty_buffers(page, bsize, 0); |
| 675 | |
| 676 | head = page_buffers(page); |
| 677 | for (bh = head, block_start = 0; bh != head || !block_start; |
| 678 | bh = bh->b_this_page, block_start += bsize) { |
| 679 | block_end = block_start + bsize; |
| 680 | |
| 681 | /* |
| 682 | * Ignore blocks outside of our i/o range - |
| 683 | * they may belong to unallocated clusters. |
| 684 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 685 | if (block_start >= to || block_end <= from) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 686 | if (PageUptodate(page)) |
| 687 | set_buffer_uptodate(bh); |
| 688 | continue; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * For an allocating write with cluster size >= page |
| 693 | * size, we always write the entire page. |
| 694 | */ |
| 695 | |
| 696 | if (buffer_new(bh)) |
| 697 | clear_buffer_new(bh); |
| 698 | |
| 699 | if (!buffer_mapped(bh)) { |
| 700 | map_bh(bh, inode->i_sb, *p_blkno); |
| 701 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 702 | } |
| 703 | |
| 704 | if (PageUptodate(page)) { |
| 705 | if (!buffer_uptodate(bh)) |
| 706 | set_buffer_uptodate(bh); |
| 707 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
| 708 | (block_start < from || block_end > to)) { |
| 709 | ll_rw_block(READ, 1, &bh); |
| 710 | *wait_bh++=bh; |
| 711 | } |
| 712 | |
| 713 | *p_blkno = *p_blkno + 1; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * If we issued read requests - let them complete. |
| 718 | */ |
| 719 | while(wait_bh > wait) { |
| 720 | wait_on_buffer(*--wait_bh); |
| 721 | if (!buffer_uptodate(*wait_bh)) |
| 722 | ret = -EIO; |
| 723 | } |
| 724 | |
| 725 | if (ret == 0 || !new) |
| 726 | return ret; |
| 727 | |
| 728 | /* |
| 729 | * If we get -EIO above, zero out any newly allocated blocks |
| 730 | * to avoid exposing stale data. |
| 731 | */ |
| 732 | bh = head; |
| 733 | block_start = 0; |
| 734 | do { |
| 735 | void *kaddr; |
| 736 | |
| 737 | block_end = block_start + bsize; |
| 738 | if (block_end <= from) |
| 739 | goto next_bh; |
| 740 | if (block_start >= to) |
| 741 | break; |
| 742 | |
| 743 | kaddr = kmap_atomic(page, KM_USER0); |
| 744 | memset(kaddr+block_start, 0, bh->b_size); |
| 745 | flush_dcache_page(page); |
| 746 | kunmap_atomic(kaddr, KM_USER0); |
| 747 | set_buffer_uptodate(bh); |
| 748 | mark_buffer_dirty(bh); |
| 749 | |
| 750 | next_bh: |
| 751 | block_start = block_end; |
| 752 | bh = bh->b_this_page; |
| 753 | } while (bh != head); |
| 754 | |
| 755 | return ret; |
| 756 | } |
| 757 | |
| 758 | /* |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 759 | * This will copy user data from the buffer page in the splice |
| 760 | * context. |
| 761 | * |
| 762 | * For now, we ignore SPLICE_F_MOVE as that would require some extra |
| 763 | * communication out all the way to ocfs2_write(). |
| 764 | */ |
| 765 | int ocfs2_map_and_write_splice_data(struct inode *inode, |
| 766 | struct ocfs2_write_ctxt *wc, u64 *p_blkno, |
| 767 | unsigned int *ret_from, unsigned int *ret_to) |
| 768 | { |
| 769 | int ret; |
| 770 | unsigned int to, from, cluster_start, cluster_end; |
| 771 | char *src, *dst; |
| 772 | struct ocfs2_splice_write_priv *sp = wc->w_private; |
| 773 | struct pipe_buffer *buf = sp->s_buf; |
| 774 | unsigned long bytes, src_from; |
| 775 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 776 | |
| 777 | ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start, |
| 778 | &cluster_end); |
| 779 | |
| 780 | from = sp->s_offset; |
| 781 | src_from = sp->s_buf_offset; |
| 782 | bytes = wc->w_count; |
| 783 | |
| 784 | if (wc->w_large_pages) { |
| 785 | /* |
| 786 | * For cluster size < page size, we have to |
| 787 | * calculate pos within the cluster and obey |
| 788 | * the rightmost boundary. |
| 789 | */ |
| 790 | bytes = min(bytes, (unsigned long)(osb->s_clustersize |
| 791 | - (wc->w_pos & (osb->s_clustersize - 1)))); |
| 792 | } |
| 793 | to = from + bytes; |
| 794 | |
| 795 | if (wc->w_this_page_new) |
| 796 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, |
| 797 | cluster_start, cluster_end, 1); |
| 798 | else |
| 799 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, |
| 800 | from, to, 0); |
| 801 | if (ret) { |
| 802 | mlog_errno(ret); |
| 803 | goto out; |
| 804 | } |
| 805 | |
| 806 | BUG_ON(from > PAGE_CACHE_SIZE); |
| 807 | BUG_ON(to > PAGE_CACHE_SIZE); |
| 808 | BUG_ON(from > osb->s_clustersize); |
| 809 | BUG_ON(to > osb->s_clustersize); |
| 810 | |
| 811 | src = buf->ops->map(sp->s_pipe, buf, 1); |
| 812 | dst = kmap_atomic(wc->w_this_page, KM_USER1); |
| 813 | memcpy(dst + from, src + src_from, bytes); |
| 814 | kunmap_atomic(wc->w_this_page, KM_USER1); |
| 815 | buf->ops->unmap(sp->s_pipe, buf, src); |
| 816 | |
| 817 | wc->w_finished_copy = 1; |
| 818 | |
| 819 | *ret_from = from; |
| 820 | *ret_to = to; |
| 821 | out: |
| 822 | |
| 823 | return bytes ? (unsigned int)bytes : ret; |
| 824 | } |
| 825 | |
| 826 | /* |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 827 | * This will copy user data from the iovec in the buffered write |
| 828 | * context. |
| 829 | */ |
| 830 | int ocfs2_map_and_write_user_data(struct inode *inode, |
| 831 | struct ocfs2_write_ctxt *wc, u64 *p_blkno, |
| 832 | unsigned int *ret_from, unsigned int *ret_to) |
| 833 | { |
| 834 | int ret; |
| 835 | unsigned int to, from, cluster_start, cluster_end; |
| 836 | unsigned long bytes, src_from; |
| 837 | char *dst; |
| 838 | struct ocfs2_buffered_write_priv *bp = wc->w_private; |
| 839 | const struct iovec *cur_iov = bp->b_cur_iov; |
| 840 | char __user *buf; |
| 841 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 842 | |
| 843 | ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start, |
| 844 | &cluster_end); |
| 845 | |
| 846 | buf = cur_iov->iov_base + bp->b_cur_off; |
| 847 | src_from = (unsigned long)buf & ~PAGE_CACHE_MASK; |
| 848 | |
| 849 | from = wc->w_pos & (PAGE_CACHE_SIZE - 1); |
| 850 | |
| 851 | /* |
| 852 | * This is a lot of comparisons, but it reads quite |
| 853 | * easily, which is important here. |
| 854 | */ |
| 855 | /* Stay within the src page */ |
| 856 | bytes = PAGE_SIZE - src_from; |
| 857 | /* Stay within the vector */ |
| 858 | bytes = min(bytes, |
| 859 | (unsigned long)(cur_iov->iov_len - bp->b_cur_off)); |
| 860 | /* Stay within count */ |
| 861 | bytes = min(bytes, (unsigned long)wc->w_count); |
| 862 | /* |
| 863 | * For clustersize > page size, just stay within |
| 864 | * target page, otherwise we have to calculate pos |
| 865 | * within the cluster and obey the rightmost |
| 866 | * boundary. |
| 867 | */ |
| 868 | if (wc->w_large_pages) { |
| 869 | /* |
| 870 | * For cluster size < page size, we have to |
| 871 | * calculate pos within the cluster and obey |
| 872 | * the rightmost boundary. |
| 873 | */ |
| 874 | bytes = min(bytes, (unsigned long)(osb->s_clustersize |
| 875 | - (wc->w_pos & (osb->s_clustersize - 1)))); |
| 876 | } else { |
| 877 | /* |
| 878 | * cluster size > page size is the most common |
| 879 | * case - we just stay within the target page |
| 880 | * boundary. |
| 881 | */ |
| 882 | bytes = min(bytes, PAGE_CACHE_SIZE - from); |
| 883 | } |
| 884 | |
| 885 | to = from + bytes; |
| 886 | |
| 887 | if (wc->w_this_page_new) |
| 888 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, |
| 889 | cluster_start, cluster_end, 1); |
| 890 | else |
| 891 | ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode, |
| 892 | from, to, 0); |
| 893 | if (ret) { |
| 894 | mlog_errno(ret); |
| 895 | goto out; |
| 896 | } |
| 897 | |
| 898 | BUG_ON(from > PAGE_CACHE_SIZE); |
| 899 | BUG_ON(to > PAGE_CACHE_SIZE); |
| 900 | BUG_ON(from > osb->s_clustersize); |
| 901 | BUG_ON(to > osb->s_clustersize); |
| 902 | |
| 903 | dst = kmap(wc->w_this_page); |
| 904 | memcpy(dst + from, bp->b_src_buf + src_from, bytes); |
| 905 | kunmap(wc->w_this_page); |
| 906 | |
| 907 | /* |
| 908 | * XXX: This is slow, but simple. The caller of |
| 909 | * ocfs2_buffered_write_cluster() is responsible for |
| 910 | * passing through the iovecs, so it's difficult to |
| 911 | * predict what our next step is in here after our |
| 912 | * initial write. A future version should be pushing |
| 913 | * that iovec manipulation further down. |
| 914 | * |
| 915 | * By setting this, we indicate that a copy from user |
| 916 | * data was done, and subsequent calls for this |
| 917 | * cluster will skip copying more data. |
| 918 | */ |
| 919 | wc->w_finished_copy = 1; |
| 920 | |
| 921 | *ret_from = from; |
| 922 | *ret_to = to; |
| 923 | out: |
| 924 | |
| 925 | return bytes ? (unsigned int)bytes : ret; |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * Map, fill and write a page to disk. |
| 930 | * |
| 931 | * The work of copying data is done via callback. Newly allocated |
| 932 | * pages which don't take user data will be zero'd (set 'new' to |
| 933 | * indicate an allocating write) |
| 934 | * |
| 935 | * Returns a negative error code or the number of bytes copied into |
| 936 | * the page. |
| 937 | */ |
| 938 | int ocfs2_write_data_page(struct inode *inode, handle_t *handle, |
| 939 | u64 *p_blkno, struct page *page, |
| 940 | struct ocfs2_write_ctxt *wc, int new) |
| 941 | { |
| 942 | int ret, copied = 0; |
| 943 | unsigned int from = 0, to = 0; |
| 944 | unsigned int cluster_start, cluster_end; |
| 945 | unsigned int zero_from = 0, zero_to = 0; |
| 946 | |
| 947 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), wc->w_cpos, |
| 948 | &cluster_start, &cluster_end); |
| 949 | |
| 950 | if ((wc->w_pos >> PAGE_CACHE_SHIFT) == page->index |
| 951 | && !wc->w_finished_copy) { |
| 952 | |
| 953 | wc->w_this_page = page; |
| 954 | wc->w_this_page_new = new; |
| 955 | ret = wc->w_write_data_page(inode, wc, p_blkno, &from, &to); |
| 956 | if (ret < 0) { |
| 957 | mlog_errno(ret); |
| 958 | goto out; |
| 959 | } |
| 960 | |
| 961 | copied = ret; |
| 962 | |
| 963 | zero_from = from; |
| 964 | zero_to = to; |
| 965 | if (new) { |
| 966 | from = cluster_start; |
| 967 | to = cluster_end; |
| 968 | } |
| 969 | } else { |
| 970 | /* |
| 971 | * If we haven't allocated the new page yet, we |
| 972 | * shouldn't be writing it out without copying user |
| 973 | * data. This is likely a math error from the caller. |
| 974 | */ |
| 975 | BUG_ON(!new); |
| 976 | |
| 977 | from = cluster_start; |
| 978 | to = cluster_end; |
| 979 | |
| 980 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 981 | cluster_start, cluster_end, 1); |
| 982 | if (ret) { |
| 983 | mlog_errno(ret); |
| 984 | goto out; |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | /* |
| 989 | * Parts of newly allocated pages need to be zero'd. |
| 990 | * |
| 991 | * Above, we have also rewritten 'to' and 'from' - as far as |
| 992 | * the rest of the function is concerned, the entire cluster |
| 993 | * range inside of a page needs to be written. |
| 994 | * |
| 995 | * We can skip this if the page is up to date - it's already |
| 996 | * been zero'd from being read in as a hole. |
| 997 | */ |
| 998 | if (new && !PageUptodate(page)) |
| 999 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), |
| 1000 | wc->w_cpos, zero_from, zero_to); |
| 1001 | |
| 1002 | flush_dcache_page(page); |
| 1003 | |
| 1004 | if (ocfs2_should_order_data(inode)) { |
| 1005 | ret = walk_page_buffers(handle, |
| 1006 | page_buffers(page), |
| 1007 | from, to, NULL, |
| 1008 | ocfs2_journal_dirty_data); |
| 1009 | if (ret < 0) |
| 1010 | mlog_errno(ret); |
| 1011 | } |
| 1012 | |
| 1013 | /* |
| 1014 | * We don't use generic_commit_write() because we need to |
| 1015 | * handle our own i_size update. |
| 1016 | */ |
| 1017 | ret = block_commit_write(page, from, to); |
| 1018 | if (ret) |
| 1019 | mlog_errno(ret); |
| 1020 | out: |
| 1021 | |
| 1022 | return copied ? copied : ret; |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * Do the actual write of some data into an inode. Optionally allocate |
| 1027 | * in order to fulfill the write. |
| 1028 | * |
| 1029 | * cpos is the logical cluster offset within the file to write at |
| 1030 | * |
| 1031 | * 'phys' is the physical mapping of that offset. a 'phys' value of |
| 1032 | * zero indicates that allocation is required. In this case, data_ac |
| 1033 | * and meta_ac should be valid (meta_ac can be null if metadata |
| 1034 | * allocation isn't required). |
| 1035 | */ |
| 1036 | static ssize_t ocfs2_write(struct file *file, u32 phys, handle_t *handle, |
| 1037 | struct buffer_head *di_bh, |
| 1038 | struct ocfs2_alloc_context *data_ac, |
| 1039 | struct ocfs2_alloc_context *meta_ac, |
| 1040 | struct ocfs2_write_ctxt *wc) |
| 1041 | { |
| 1042 | int ret, i, numpages = 1, new; |
| 1043 | unsigned int copied = 0; |
| 1044 | u32 tmp_pos; |
| 1045 | u64 v_blkno, p_blkno; |
| 1046 | struct address_space *mapping = file->f_mapping; |
| 1047 | struct inode *inode = mapping->host; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1048 | unsigned long index, start; |
| 1049 | struct page **cpages; |
| 1050 | |
| 1051 | new = phys == 0 ? 1 : 0; |
| 1052 | |
| 1053 | /* |
| 1054 | * Figure out how many pages we'll be manipulating here. For |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 1055 | * non allocating write, we just change the one |
| 1056 | * page. Otherwise, we'll need a whole clusters worth. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1057 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 1058 | if (new) |
| 1059 | numpages = ocfs2_pages_per_cluster(inode->i_sb); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1060 | |
| 1061 | cpages = kzalloc(sizeof(*cpages) * numpages, GFP_NOFS); |
| 1062 | if (!cpages) { |
| 1063 | ret = -ENOMEM; |
| 1064 | mlog_errno(ret); |
| 1065 | return ret; |
| 1066 | } |
| 1067 | |
| 1068 | /* |
| 1069 | * Fill our page array first. That way we've grabbed enough so |
| 1070 | * that we can zero and flush if we error after adding the |
| 1071 | * extent. |
| 1072 | */ |
| 1073 | if (new) { |
| 1074 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, |
| 1075 | wc->w_cpos); |
| 1076 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, wc->w_cpos); |
| 1077 | } else { |
| 1078 | start = wc->w_pos >> PAGE_CACHE_SHIFT; |
| 1079 | v_blkno = wc->w_pos >> inode->i_sb->s_blocksize_bits; |
| 1080 | } |
| 1081 | |
| 1082 | for(i = 0; i < numpages; i++) { |
| 1083 | index = start + i; |
| 1084 | |
| 1085 | cpages[i] = grab_cache_page(mapping, index); |
| 1086 | if (!cpages[i]) { |
| 1087 | ret = -ENOMEM; |
| 1088 | mlog_errno(ret); |
| 1089 | goto out; |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | if (new) { |
| 1094 | /* |
| 1095 | * This is safe to call with the page locks - it won't take |
| 1096 | * any additional semaphores or cluster locks. |
| 1097 | */ |
| 1098 | tmp_pos = wc->w_cpos; |
| 1099 | ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode, |
| 1100 | &tmp_pos, 1, di_bh, handle, |
| 1101 | data_ac, meta_ac, NULL); |
| 1102 | /* |
| 1103 | * This shouldn't happen because we must have already |
| 1104 | * calculated the correct meta data allocation required. The |
| 1105 | * internal tree allocation code should know how to increase |
| 1106 | * transaction credits itself. |
| 1107 | * |
| 1108 | * If need be, we could handle -EAGAIN for a |
| 1109 | * RESTART_TRANS here. |
| 1110 | */ |
| 1111 | mlog_bug_on_msg(ret == -EAGAIN, |
| 1112 | "Inode %llu: EAGAIN return during allocation.\n", |
| 1113 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 1114 | if (ret < 0) { |
| 1115 | mlog_errno(ret); |
| 1116 | goto out; |
| 1117 | } |
| 1118 | } |
| 1119 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 1120 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
| 1121 | NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1122 | if (ret < 0) { |
| 1123 | |
| 1124 | /* |
| 1125 | * XXX: Should we go readonly here? |
| 1126 | */ |
| 1127 | |
| 1128 | mlog_errno(ret); |
| 1129 | goto out; |
| 1130 | } |
| 1131 | |
| 1132 | BUG_ON(p_blkno == 0); |
| 1133 | |
| 1134 | for(i = 0; i < numpages; i++) { |
| 1135 | ret = ocfs2_write_data_page(inode, handle, &p_blkno, cpages[i], |
| 1136 | wc, new); |
| 1137 | if (ret < 0) { |
| 1138 | mlog_errno(ret); |
| 1139 | goto out; |
| 1140 | } |
| 1141 | |
| 1142 | copied += ret; |
| 1143 | } |
| 1144 | |
| 1145 | out: |
| 1146 | for(i = 0; i < numpages; i++) { |
| 1147 | unlock_page(cpages[i]); |
| 1148 | mark_page_accessed(cpages[i]); |
| 1149 | page_cache_release(cpages[i]); |
| 1150 | } |
| 1151 | kfree(cpages); |
| 1152 | |
| 1153 | return copied ? copied : ret; |
| 1154 | } |
| 1155 | |
| 1156 | static void ocfs2_write_ctxt_init(struct ocfs2_write_ctxt *wc, |
| 1157 | struct ocfs2_super *osb, loff_t pos, |
| 1158 | size_t count, ocfs2_page_writer *cb, |
| 1159 | void *cb_priv) |
| 1160 | { |
| 1161 | wc->w_count = count; |
| 1162 | wc->w_pos = pos; |
| 1163 | wc->w_cpos = wc->w_pos >> osb->s_clustersize_bits; |
| 1164 | wc->w_finished_copy = 0; |
| 1165 | |
| 1166 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
| 1167 | wc->w_large_pages = 1; |
| 1168 | else |
| 1169 | wc->w_large_pages = 0; |
| 1170 | |
| 1171 | wc->w_write_data_page = cb; |
| 1172 | wc->w_private = cb_priv; |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * Write a cluster to an inode. The cluster may not be allocated yet, |
| 1177 | * in which case it will be. This only exists for buffered writes - |
| 1178 | * O_DIRECT takes a more "traditional" path through the kernel. |
| 1179 | * |
| 1180 | * The caller is responsible for incrementing pos, written counts, etc |
| 1181 | * |
| 1182 | * For file systems that don't support sparse files, pre-allocation |
| 1183 | * and page zeroing up until cpos should be done prior to this |
| 1184 | * function call. |
| 1185 | * |
| 1186 | * Callers should be holding i_sem, and the rw cluster lock. |
| 1187 | * |
| 1188 | * Returns the number of user bytes written, or less than zero for |
| 1189 | * error. |
| 1190 | */ |
| 1191 | ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos, |
| 1192 | size_t count, ocfs2_page_writer *actor, |
| 1193 | void *priv) |
| 1194 | { |
| 1195 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; |
| 1196 | ssize_t written = 0; |
| 1197 | u32 phys; |
| 1198 | struct inode *inode = file->f_mapping->host; |
| 1199 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1200 | struct buffer_head *di_bh = NULL; |
| 1201 | struct ocfs2_dinode *di; |
| 1202 | struct ocfs2_alloc_context *data_ac = NULL; |
| 1203 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 1204 | handle_t *handle; |
| 1205 | struct ocfs2_write_ctxt wc; |
| 1206 | |
| 1207 | ocfs2_write_ctxt_init(&wc, osb, pos, count, actor, priv); |
| 1208 | |
| 1209 | ret = ocfs2_meta_lock(inode, &di_bh, 1); |
| 1210 | if (ret) { |
| 1211 | mlog_errno(ret); |
| 1212 | goto out; |
| 1213 | } |
| 1214 | di = (struct ocfs2_dinode *)di_bh->b_data; |
| 1215 | |
| 1216 | /* |
| 1217 | * Take alloc sem here to prevent concurrent lookups. That way |
| 1218 | * the mapping, zeroing and tree manipulation within |
| 1219 | * ocfs2_write() will be safe against ->readpage(). This |
| 1220 | * should also serve to lock out allocation from a shared |
| 1221 | * writeable region. |
| 1222 | */ |
| 1223 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1224 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame^] | 1225 | ret = ocfs2_get_clusters(inode, wc.w_cpos, &phys, NULL, NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1226 | if (ret) { |
| 1227 | mlog_errno(ret); |
| 1228 | goto out_meta; |
| 1229 | } |
| 1230 | |
| 1231 | /* phys == 0 means that allocation is required. */ |
| 1232 | if (phys == 0) { |
| 1233 | ret = ocfs2_lock_allocators(inode, di, 1, &data_ac, &meta_ac); |
| 1234 | if (ret) { |
| 1235 | mlog_errno(ret); |
| 1236 | goto out_meta; |
| 1237 | } |
| 1238 | |
| 1239 | credits = ocfs2_calc_extend_credits(inode->i_sb, di, 1); |
| 1240 | } |
| 1241 | |
| 1242 | ret = ocfs2_data_lock(inode, 1); |
| 1243 | if (ret) { |
| 1244 | mlog_errno(ret); |
| 1245 | goto out_meta; |
| 1246 | } |
| 1247 | |
| 1248 | handle = ocfs2_start_trans(osb, credits); |
| 1249 | if (IS_ERR(handle)) { |
| 1250 | ret = PTR_ERR(handle); |
| 1251 | mlog_errno(ret); |
| 1252 | goto out_data; |
| 1253 | } |
| 1254 | |
| 1255 | written = ocfs2_write(file, phys, handle, di_bh, data_ac, |
| 1256 | meta_ac, &wc); |
| 1257 | if (written < 0) { |
| 1258 | ret = written; |
| 1259 | mlog_errno(ret); |
| 1260 | goto out_commit; |
| 1261 | } |
| 1262 | |
| 1263 | ret = ocfs2_journal_access(handle, inode, di_bh, |
| 1264 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1265 | if (ret) { |
| 1266 | mlog_errno(ret); |
| 1267 | goto out_commit; |
| 1268 | } |
| 1269 | |
| 1270 | pos += written; |
| 1271 | if (pos > inode->i_size) { |
| 1272 | i_size_write(inode, pos); |
| 1273 | mark_inode_dirty(inode); |
| 1274 | } |
| 1275 | inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode))); |
| 1276 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
| 1277 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1278 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
| 1279 | di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); |
| 1280 | |
| 1281 | ret = ocfs2_journal_dirty(handle, di_bh); |
| 1282 | if (ret) |
| 1283 | mlog_errno(ret); |
| 1284 | |
| 1285 | out_commit: |
| 1286 | ocfs2_commit_trans(osb, handle); |
| 1287 | |
| 1288 | out_data: |
| 1289 | ocfs2_data_unlock(inode, 1); |
| 1290 | |
| 1291 | out_meta: |
| 1292 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1293 | ocfs2_meta_unlock(inode, 1); |
| 1294 | |
| 1295 | out: |
| 1296 | brelse(di_bh); |
| 1297 | if (data_ac) |
| 1298 | ocfs2_free_alloc_context(data_ac); |
| 1299 | if (meta_ac) |
| 1300 | ocfs2_free_alloc_context(meta_ac); |
| 1301 | |
| 1302 | return written ? written : ret; |
| 1303 | } |
| 1304 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1305 | const struct address_space_operations ocfs2_aops = { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1306 | .readpage = ocfs2_readpage, |
| 1307 | .writepage = ocfs2_writepage, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1308 | .bmap = ocfs2_bmap, |
| 1309 | .sync_page = block_sync_page, |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 1310 | .direct_IO = ocfs2_direct_IO, |
| 1311 | .invalidatepage = ocfs2_invalidatepage, |
| 1312 | .releasepage = ocfs2_releasepage, |
| 1313 | .migratepage = buffer_migrate_page, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1314 | }; |