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 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 209 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
| 210 | struct buffer_head *di_bh) |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 211 | { |
| 212 | void *kaddr; |
| 213 | unsigned int size; |
| 214 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 215 | |
| 216 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { |
| 217 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag", |
| 218 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 219 | return -EROFS; |
| 220 | } |
| 221 | |
| 222 | size = i_size_read(inode); |
| 223 | |
| 224 | if (size > PAGE_CACHE_SIZE || |
| 225 | size > ocfs2_max_inline_data(inode->i_sb)) { |
| 226 | ocfs2_error(inode->i_sb, |
| 227 | "Inode %llu has with inline data has bad size: %u", |
| 228 | (unsigned long long)OCFS2_I(inode)->ip_blkno, size); |
| 229 | return -EROFS; |
| 230 | } |
| 231 | |
| 232 | kaddr = kmap_atomic(page, KM_USER0); |
| 233 | if (size) |
| 234 | memcpy(kaddr, di->id2.i_data.id_data, size); |
| 235 | /* Clear the remaining part of the page */ |
| 236 | memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); |
| 237 | flush_dcache_page(page); |
| 238 | kunmap_atomic(kaddr, KM_USER0); |
| 239 | |
| 240 | SetPageUptodate(page); |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) |
| 246 | { |
| 247 | int ret; |
| 248 | struct buffer_head *di_bh = NULL; |
| 249 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 250 | |
| 251 | BUG_ON(!PageLocked(page)); |
| 252 | BUG_ON(!OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL); |
| 253 | |
| 254 | ret = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &di_bh, |
| 255 | OCFS2_BH_CACHED, inode); |
| 256 | if (ret) { |
| 257 | mlog_errno(ret); |
| 258 | goto out; |
| 259 | } |
| 260 | |
| 261 | ret = ocfs2_read_inline_data(inode, page, di_bh); |
| 262 | out: |
| 263 | unlock_page(page); |
| 264 | |
| 265 | brelse(di_bh); |
| 266 | return ret; |
| 267 | } |
| 268 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 269 | static int ocfs2_readpage(struct file *file, struct page *page) |
| 270 | { |
| 271 | struct inode *inode = page->mapping->host; |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 272 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 273 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 274 | int ret, unlock = 1; |
| 275 | |
| 276 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); |
| 277 | |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 278 | ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 279 | if (ret != 0) { |
| 280 | if (ret == AOP_TRUNCATED_PAGE) |
| 281 | unlock = 0; |
| 282 | mlog_errno(ret); |
| 283 | goto out; |
| 284 | } |
| 285 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 286 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 287 | ret = AOP_TRUNCATED_PAGE; |
| 288 | goto out_meta_unlock; |
| 289 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 290 | |
| 291 | /* |
| 292 | * i_size might have just been updated as we grabed the meta lock. We |
| 293 | * might now be discovering a truncate that hit on another node. |
| 294 | * block_read_full_page->get_block freaks out if it is asked to read |
| 295 | * beyond the end of a file, so we check here. Callers |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 296 | * (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] | 297 | * and notice that the page they just read isn't needed. |
| 298 | * |
| 299 | * XXX sys_readahead() seems to get that wrong? |
| 300 | */ |
| 301 | if (start >= i_size_read(inode)) { |
Nate Diller | 5c3c6bb | 2007-05-10 22:56:01 -0700 | [diff] [blame] | 302 | zero_user_page(page, 0, PAGE_SIZE, KM_USER0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 303 | SetPageUptodate(page); |
| 304 | ret = 0; |
| 305 | goto out_alloc; |
| 306 | } |
| 307 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 308 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 309 | ret = ocfs2_readpage_inline(inode, page); |
| 310 | else |
| 311 | ret = block_read_full_page(page, ocfs2_get_block); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 312 | unlock = 0; |
| 313 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 314 | out_alloc: |
| 315 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 316 | out_meta_unlock: |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 317 | ocfs2_meta_unlock(inode, 0); |
| 318 | out: |
| 319 | if (unlock) |
| 320 | unlock_page(page); |
| 321 | mlog_exit(ret); |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | /* Note: Because we don't support holes, our allocation has |
| 326 | * already happened (allocation writes zeros to the file data) |
| 327 | * so we don't have to worry about ordered writes in |
| 328 | * ocfs2_writepage. |
| 329 | * |
| 330 | * ->writepage is called during the process of invalidating the page cache |
| 331 | * during blocked lock processing. It can't block on any cluster locks |
| 332 | * to during block mapping. It's relying on the fact that the block |
| 333 | * mapping can't have disappeared under the dirty pages that it is |
| 334 | * being asked to write back. |
| 335 | */ |
| 336 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) |
| 337 | { |
| 338 | int ret; |
| 339 | |
| 340 | mlog_entry("(0x%p)\n", page); |
| 341 | |
| 342 | ret = block_write_full_page(page, ocfs2_get_block, wbc); |
| 343 | |
| 344 | mlog_exit(ret); |
| 345 | |
| 346 | return ret; |
| 347 | } |
| 348 | |
Mark Fasheh | 5069120 | 2007-02-09 20:52:53 -0800 | [diff] [blame] | 349 | /* |
| 350 | * This is called from ocfs2_write_zero_page() which has handled it's |
| 351 | * own cluster locking and has ensured allocation exists for those |
| 352 | * blocks to be written. |
| 353 | */ |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 354 | int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page, |
| 355 | unsigned from, unsigned to) |
| 356 | { |
| 357 | int ret; |
| 358 | |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 359 | ret = block_prepare_write(page, from, to, ocfs2_get_block); |
| 360 | |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 361 | return ret; |
| 362 | } |
| 363 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 364 | /* Taken from ext3. We don't necessarily need the full blown |
| 365 | * functionality yet, but IMHO it's better to cut and paste the whole |
| 366 | * thing so we can avoid introducing our own bugs (and easily pick up |
| 367 | * their fixes when they happen) --Mark */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 368 | int walk_page_buffers( handle_t *handle, |
| 369 | struct buffer_head *head, |
| 370 | unsigned from, |
| 371 | unsigned to, |
| 372 | int *partial, |
| 373 | int (*fn)( handle_t *handle, |
| 374 | struct buffer_head *bh)) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 375 | { |
| 376 | struct buffer_head *bh; |
| 377 | unsigned block_start, block_end; |
| 378 | unsigned blocksize = head->b_size; |
| 379 | int err, ret = 0; |
| 380 | struct buffer_head *next; |
| 381 | |
| 382 | for ( bh = head, block_start = 0; |
| 383 | ret == 0 && (bh != head || !block_start); |
| 384 | block_start = block_end, bh = next) |
| 385 | { |
| 386 | next = bh->b_this_page; |
| 387 | block_end = block_start + blocksize; |
| 388 | if (block_end <= from || block_start >= to) { |
| 389 | if (partial && !buffer_uptodate(bh)) |
| 390 | *partial = 1; |
| 391 | continue; |
| 392 | } |
| 393 | err = (*fn)(handle, bh); |
| 394 | if (!ret) |
| 395 | ret = err; |
| 396 | } |
| 397 | return ret; |
| 398 | } |
| 399 | |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 400 | handle_t *ocfs2_start_walk_page_trans(struct inode *inode, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 401 | struct page *page, |
| 402 | unsigned from, |
| 403 | unsigned to) |
| 404 | { |
| 405 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 406 | handle_t *handle = NULL; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 407 | int ret = 0; |
| 408 | |
Mark Fasheh | 65eff9c | 2006-10-09 17:26:22 -0700 | [diff] [blame] | 409 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 410 | if (!handle) { |
| 411 | ret = -ENOMEM; |
| 412 | mlog_errno(ret); |
| 413 | goto out; |
| 414 | } |
| 415 | |
| 416 | if (ocfs2_should_order_data(inode)) { |
Mark Fasheh | 1fabe14 | 2006-10-09 18:11:45 -0700 | [diff] [blame] | 417 | ret = walk_page_buffers(handle, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 418 | page_buffers(page), |
| 419 | from, to, NULL, |
| 420 | ocfs2_journal_dirty_data); |
| 421 | if (ret < 0) |
| 422 | mlog_errno(ret); |
| 423 | } |
| 424 | out: |
| 425 | if (ret) { |
| 426 | if (handle) |
Mark Fasheh | 02dc1af | 2006-10-09 16:48:10 -0700 | [diff] [blame] | 427 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 428 | handle = ERR_PTR(ret); |
| 429 | } |
| 430 | return handle; |
| 431 | } |
| 432 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 433 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
| 434 | { |
| 435 | sector_t status; |
| 436 | u64 p_blkno = 0; |
| 437 | int err = 0; |
| 438 | struct inode *inode = mapping->host; |
| 439 | |
| 440 | mlog_entry("(block = %llu)\n", (unsigned long long)block); |
| 441 | |
| 442 | /* We don't need to lock journal system files, since they aren't |
| 443 | * accessed concurrently from multiple nodes. |
| 444 | */ |
| 445 | if (!INODE_JOURNAL(inode)) { |
Mark Fasheh | 4bcec18 | 2006-10-09 16:02:40 -0700 | [diff] [blame] | 446 | err = ocfs2_meta_lock(inode, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 447 | if (err) { |
| 448 | if (err != -ENOENT) |
| 449 | mlog_errno(err); |
| 450 | goto bail; |
| 451 | } |
| 452 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 453 | } |
| 454 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 455 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 456 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, |
| 457 | NULL); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 458 | |
| 459 | if (!INODE_JOURNAL(inode)) { |
| 460 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 461 | ocfs2_meta_unlock(inode, 0); |
| 462 | } |
| 463 | |
| 464 | if (err) { |
| 465 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", |
| 466 | (unsigned long long)block); |
| 467 | mlog_errno(err); |
| 468 | goto bail; |
| 469 | } |
| 470 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 471 | bail: |
| 472 | status = err ? 0 : p_blkno; |
| 473 | |
| 474 | mlog_exit((int)status); |
| 475 | |
| 476 | return status; |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * TODO: Make this into a generic get_blocks function. |
| 481 | * |
| 482 | * From do_direct_io in direct-io.c: |
| 483 | * "So what we do is to permit the ->get_blocks function to populate |
| 484 | * bh.b_size with the size of IO which is permitted at this offset and |
| 485 | * this i_blkbits." |
| 486 | * |
| 487 | * This function is called directly from get_more_blocks in direct-io.c. |
| 488 | * |
| 489 | * called like this: dio->get_blocks(dio->inode, fs_startblk, |
| 490 | * fs_count, map_bh, dio->rw == WRITE); |
| 491 | */ |
| 492 | 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] | 493 | struct buffer_head *bh_result, int create) |
| 494 | { |
| 495 | int ret; |
Mark Fasheh | 4f902c3 | 2007-03-09 16:26:50 -0800 | [diff] [blame] | 496 | u64 p_blkno, inode_blocks, contig_blocks; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 497 | unsigned int ext_flags; |
Florin Malita | 184d7d2 | 2006-06-03 19:30:10 -0400 | [diff] [blame] | 498 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 499 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 500 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 501 | /* This function won't even be called if the request isn't all |
| 502 | * nicely aligned and of the right size, so there's no need |
| 503 | * for us to check any of that. */ |
| 504 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 505 | 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] | 506 | |
| 507 | /* |
| 508 | * Any write past EOF is not allowed because we'd be extending. |
| 509 | */ |
| 510 | if (create && (iblock + max_blocks) > inode_blocks) { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 511 | ret = -EIO; |
| 512 | goto bail; |
| 513 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 514 | |
| 515 | /* This figures out the size of the next contiguous block, and |
| 516 | * our logical offset */ |
Mark Fasheh | 363041a | 2007-01-17 12:31:35 -0800 | [diff] [blame] | 517 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 518 | &contig_blocks, &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 519 | if (ret) { |
| 520 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", |
| 521 | (unsigned long long)iblock); |
| 522 | ret = -EIO; |
| 523 | goto bail; |
| 524 | } |
| 525 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 526 | if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) { |
| 527 | ocfs2_error(inode->i_sb, |
| 528 | "Inode %llu has a hole at block %llu\n", |
| 529 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 530 | (unsigned long long)iblock); |
| 531 | ret = -EROFS; |
| 532 | goto bail; |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * get_more_blocks() expects us to describe a hole by clearing |
| 537 | * the mapped bit on bh_result(). |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 538 | * |
| 539 | * Consider an unwritten extent as a hole. |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 540 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 541 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 542 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 543 | else { |
| 544 | /* |
| 545 | * ocfs2_prepare_inode_for_write() should have caught |
| 546 | * the case where we'd be filling a hole and triggered |
| 547 | * a buffered write instead. |
| 548 | */ |
| 549 | if (create) { |
| 550 | ret = -EIO; |
| 551 | mlog_errno(ret); |
| 552 | goto bail; |
| 553 | } |
| 554 | |
| 555 | clear_buffer_mapped(bh_result); |
| 556 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 557 | |
| 558 | /* make sure we don't map more than max_blocks blocks here as |
| 559 | that's all the kernel will handle at this point. */ |
| 560 | if (max_blocks < contig_blocks) |
| 561 | contig_blocks = max_blocks; |
| 562 | bh_result->b_size = contig_blocks << blocksize_bits; |
| 563 | bail: |
| 564 | return ret; |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
| 569 | * particularly interested in the aio/dio case. Like the core uses |
| 570 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from |
| 571 | * truncation on another. |
| 572 | */ |
| 573 | static void ocfs2_dio_end_io(struct kiocb *iocb, |
| 574 | loff_t offset, |
| 575 | ssize_t bytes, |
| 576 | void *private) |
| 577 | { |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 578 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 579 | int level; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 580 | |
| 581 | /* this io's submitter should not have unlocked this before we could */ |
| 582 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 583 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 584 | ocfs2_iocb_clear_rw_locked(iocb); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 585 | |
| 586 | level = ocfs2_iocb_rw_locked_level(iocb); |
| 587 | if (!level) |
| 588 | up_read(&inode->i_alloc_sem); |
| 589 | ocfs2_rw_unlock(inode, level); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 590 | } |
| 591 | |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 592 | /* |
| 593 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen |
| 594 | * from ext3. PageChecked() bits have been removed as OCFS2 does not |
| 595 | * do journalled data. |
| 596 | */ |
| 597 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) |
| 598 | { |
| 599 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 600 | |
| 601 | journal_invalidatepage(journal, page, offset); |
| 602 | } |
| 603 | |
| 604 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
| 605 | { |
| 606 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 607 | |
| 608 | if (!page_has_buffers(page)) |
| 609 | return 0; |
| 610 | return journal_try_to_free_buffers(journal, page, wait); |
| 611 | } |
| 612 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 613 | static ssize_t ocfs2_direct_IO(int rw, |
| 614 | struct kiocb *iocb, |
| 615 | const struct iovec *iov, |
| 616 | loff_t offset, |
| 617 | unsigned long nr_segs) |
| 618 | { |
| 619 | struct file *file = iocb->ki_filp; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 620 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 621 | int ret; |
| 622 | |
| 623 | mlog_entry_void(); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 624 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 625 | /* |
| 626 | * Fallback to buffered I/O if we see an inode without |
| 627 | * extents. |
| 628 | */ |
| 629 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 630 | return 0; |
| 631 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 632 | ret = blockdev_direct_IO_no_locking(rw, iocb, inode, |
| 633 | inode->i_sb->s_bdev, iov, offset, |
| 634 | nr_segs, |
| 635 | ocfs2_direct_IO_get_blocks, |
| 636 | ocfs2_dio_end_io); |
Mark Fasheh | c934a92 | 2007-10-18 15:23:46 -0700 | [diff] [blame^] | 637 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 638 | mlog_exit(ret); |
| 639 | return ret; |
| 640 | } |
| 641 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 642 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
| 643 | u32 cpos, |
| 644 | unsigned int *start, |
| 645 | unsigned int *end) |
| 646 | { |
| 647 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; |
| 648 | |
| 649 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { |
| 650 | unsigned int cpp; |
| 651 | |
| 652 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); |
| 653 | |
| 654 | cluster_start = cpos % cpp; |
| 655 | cluster_start = cluster_start << osb->s_clustersize_bits; |
| 656 | |
| 657 | cluster_end = cluster_start + osb->s_clustersize; |
| 658 | } |
| 659 | |
| 660 | BUG_ON(cluster_start > PAGE_SIZE); |
| 661 | BUG_ON(cluster_end > PAGE_SIZE); |
| 662 | |
| 663 | if (start) |
| 664 | *start = cluster_start; |
| 665 | if (end) |
| 666 | *end = cluster_end; |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * 'from' and 'to' are the region in the page to avoid zeroing. |
| 671 | * |
| 672 | * If pagesize > clustersize, this function will avoid zeroing outside |
| 673 | * of the cluster boundary. |
| 674 | * |
| 675 | * from == to == 0 is code for "zero the entire cluster region" |
| 676 | */ |
| 677 | static void ocfs2_clear_page_regions(struct page *page, |
| 678 | struct ocfs2_super *osb, u32 cpos, |
| 679 | unsigned from, unsigned to) |
| 680 | { |
| 681 | void *kaddr; |
| 682 | unsigned int cluster_start, cluster_end; |
| 683 | |
| 684 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); |
| 685 | |
| 686 | kaddr = kmap_atomic(page, KM_USER0); |
| 687 | |
| 688 | if (from || to) { |
| 689 | if (from > cluster_start) |
| 690 | memset(kaddr + cluster_start, 0, from - cluster_start); |
| 691 | if (to < cluster_end) |
| 692 | memset(kaddr + to, 0, cluster_end - to); |
| 693 | } else { |
| 694 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); |
| 695 | } |
| 696 | |
| 697 | kunmap_atomic(kaddr, KM_USER0); |
| 698 | } |
| 699 | |
| 700 | /* |
Mark Fasheh | 4e9563f | 2007-11-01 11:37:48 -0700 | [diff] [blame] | 701 | * Nonsparse file systems fully allocate before we get to the write |
| 702 | * code. This prevents ocfs2_write() from tagging the write as an |
| 703 | * allocating one, which means ocfs2_map_page_blocks() might try to |
| 704 | * read-in the blocks at the tail of our file. Avoid reading them by |
| 705 | * testing i_size against each block offset. |
| 706 | */ |
| 707 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, |
| 708 | unsigned int block_start) |
| 709 | { |
| 710 | u64 offset = page_offset(page) + block_start; |
| 711 | |
| 712 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| 713 | return 1; |
| 714 | |
| 715 | if (i_size_read(inode) > offset) |
| 716 | return 1; |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | /* |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 722 | * Some of this taken from block_prepare_write(). We already have our |
| 723 | * mapping by now though, and the entire write will be allocating or |
| 724 | * it won't, so not much need to use BH_New. |
| 725 | * |
| 726 | * This will also skip zeroing, which is handled externally. |
| 727 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 728 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
| 729 | struct inode *inode, unsigned int from, |
| 730 | unsigned int to, int new) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 731 | { |
| 732 | int ret = 0; |
| 733 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; |
| 734 | unsigned int block_end, block_start; |
| 735 | unsigned int bsize = 1 << inode->i_blkbits; |
| 736 | |
| 737 | if (!page_has_buffers(page)) |
| 738 | create_empty_buffers(page, bsize, 0); |
| 739 | |
| 740 | head = page_buffers(page); |
| 741 | for (bh = head, block_start = 0; bh != head || !block_start; |
| 742 | bh = bh->b_this_page, block_start += bsize) { |
| 743 | block_end = block_start + bsize; |
| 744 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 745 | clear_buffer_new(bh); |
| 746 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 747 | /* |
| 748 | * Ignore blocks outside of our i/o range - |
| 749 | * they may belong to unallocated clusters. |
| 750 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 751 | if (block_start >= to || block_end <= from) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 752 | if (PageUptodate(page)) |
| 753 | set_buffer_uptodate(bh); |
| 754 | continue; |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | * For an allocating write with cluster size >= page |
| 759 | * size, we always write the entire page. |
| 760 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 761 | if (new) |
| 762 | set_buffer_new(bh); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 763 | |
| 764 | if (!buffer_mapped(bh)) { |
| 765 | map_bh(bh, inode->i_sb, *p_blkno); |
| 766 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 767 | } |
| 768 | |
| 769 | if (PageUptodate(page)) { |
| 770 | if (!buffer_uptodate(bh)) |
| 771 | set_buffer_uptodate(bh); |
| 772 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 773 | !buffer_new(bh) && |
Mark Fasheh | 4e9563f | 2007-11-01 11:37:48 -0700 | [diff] [blame] | 774 | ocfs2_should_read_blk(inode, page, block_start) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 775 | (block_start < from || block_end > to)) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 776 | ll_rw_block(READ, 1, &bh); |
| 777 | *wait_bh++=bh; |
| 778 | } |
| 779 | |
| 780 | *p_blkno = *p_blkno + 1; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * If we issued read requests - let them complete. |
| 785 | */ |
| 786 | while(wait_bh > wait) { |
| 787 | wait_on_buffer(*--wait_bh); |
| 788 | if (!buffer_uptodate(*wait_bh)) |
| 789 | ret = -EIO; |
| 790 | } |
| 791 | |
| 792 | if (ret == 0 || !new) |
| 793 | return ret; |
| 794 | |
| 795 | /* |
| 796 | * If we get -EIO above, zero out any newly allocated blocks |
| 797 | * to avoid exposing stale data. |
| 798 | */ |
| 799 | bh = head; |
| 800 | block_start = 0; |
| 801 | do { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 802 | block_end = block_start + bsize; |
| 803 | if (block_end <= from) |
| 804 | goto next_bh; |
| 805 | if (block_start >= to) |
| 806 | break; |
| 807 | |
Eric Sandeen | 54c57dc | 2007-06-20 17:15:10 -0700 | [diff] [blame] | 808 | zero_user_page(page, block_start, bh->b_size, KM_USER0); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 809 | set_buffer_uptodate(bh); |
| 810 | mark_buffer_dirty(bh); |
| 811 | |
| 812 | next_bh: |
| 813 | block_start = block_end; |
| 814 | bh = bh->b_this_page; |
| 815 | } while (bh != head); |
| 816 | |
| 817 | return ret; |
| 818 | } |
| 819 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 820 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
| 821 | #define OCFS2_MAX_CTXT_PAGES 1 |
| 822 | #else |
| 823 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) |
| 824 | #endif |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 825 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 826 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 827 | |
| 828 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 829 | * Describe the state of a single cluster to be written to. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 830 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 831 | struct ocfs2_write_cluster_desc { |
| 832 | u32 c_cpos; |
| 833 | u32 c_phys; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 834 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 835 | * Give this a unique field because c_phys eventually gets |
| 836 | * filled. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 837 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 838 | unsigned c_new; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 839 | unsigned c_unwritten; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 840 | }; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 841 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 842 | static inline int ocfs2_should_zero_cluster(struct ocfs2_write_cluster_desc *d) |
| 843 | { |
| 844 | return d->c_new || d->c_unwritten; |
| 845 | } |
| 846 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 847 | struct ocfs2_write_ctxt { |
| 848 | /* Logical cluster position / len of write */ |
| 849 | u32 w_cpos; |
| 850 | u32 w_clen; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 851 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 852 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 853 | |
| 854 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 855 | * This is true if page_size > cluster_size. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 856 | * |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 857 | * It triggers a set of special cases during write which might |
| 858 | * have to deal with allocating writes to partial pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 859 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 860 | unsigned int w_large_pages; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 861 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 862 | /* |
| 863 | * Pages involved in this write. |
| 864 | * |
| 865 | * w_target_page is the page being written to by the user. |
| 866 | * |
| 867 | * w_pages is an array of pages which always contains |
| 868 | * w_target_page, and in the case of an allocating write with |
| 869 | * page_size < cluster size, it will contain zero'd and mapped |
| 870 | * pages adjacent to w_target_page which need to be written |
| 871 | * out in so that future reads from that region will get |
| 872 | * zero's. |
| 873 | */ |
| 874 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
| 875 | unsigned int w_num_pages; |
| 876 | struct page *w_target_page; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 877 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 878 | /* |
| 879 | * ocfs2_write_end() uses this to know what the real range to |
| 880 | * write in the target should be. |
| 881 | */ |
| 882 | unsigned int w_target_from; |
| 883 | unsigned int w_target_to; |
| 884 | |
| 885 | /* |
| 886 | * We could use journal_current_handle() but this is cleaner, |
| 887 | * IMHO -Mark |
| 888 | */ |
| 889 | handle_t *w_handle; |
| 890 | |
| 891 | struct buffer_head *w_di_bh; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 892 | |
| 893 | struct ocfs2_cached_dealloc_ctxt w_dealloc; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 894 | }; |
| 895 | |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 896 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 897 | { |
| 898 | int i; |
| 899 | |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 900 | for(i = 0; i < num_pages; i++) { |
| 901 | if (pages[i]) { |
| 902 | unlock_page(pages[i]); |
| 903 | mark_page_accessed(pages[i]); |
| 904 | page_cache_release(pages[i]); |
| 905 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 906 | } |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) |
| 910 | { |
| 911 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 912 | |
| 913 | brelse(wc->w_di_bh); |
| 914 | kfree(wc); |
| 915 | } |
| 916 | |
| 917 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, |
| 918 | struct ocfs2_super *osb, loff_t pos, |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 919 | unsigned len, struct buffer_head *di_bh) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 920 | { |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 921 | u32 cend; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 922 | struct ocfs2_write_ctxt *wc; |
| 923 | |
| 924 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); |
| 925 | if (!wc) |
| 926 | return -ENOMEM; |
| 927 | |
| 928 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 929 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
| 930 | wc->w_clen = cend - wc->w_cpos + 1; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 931 | get_bh(di_bh); |
| 932 | wc->w_di_bh = di_bh; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 933 | |
| 934 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
| 935 | wc->w_large_pages = 1; |
| 936 | else |
| 937 | wc->w_large_pages = 0; |
| 938 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 939 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
| 940 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 941 | *wcp = wc; |
| 942 | |
| 943 | return 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 944 | } |
| 945 | |
| 946 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 947 | * If a page has any new buffers, zero them out here, and mark them uptodate |
| 948 | * and dirty so they'll be written out (in order to prevent uninitialised |
| 949 | * block data from leaking). And clear the new bit. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 950 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 951 | 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] | 952 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 953 | unsigned int block_start, block_end; |
| 954 | struct buffer_head *head, *bh; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 955 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 956 | BUG_ON(!PageLocked(page)); |
| 957 | if (!page_has_buffers(page)) |
| 958 | return; |
| 959 | |
| 960 | bh = head = page_buffers(page); |
| 961 | block_start = 0; |
| 962 | do { |
| 963 | block_end = block_start + bh->b_size; |
| 964 | |
| 965 | if (buffer_new(bh)) { |
| 966 | if (block_end > from && block_start < to) { |
| 967 | if (!PageUptodate(page)) { |
| 968 | unsigned start, end; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 969 | |
| 970 | start = max(from, block_start); |
| 971 | end = min(to, block_end); |
| 972 | |
Eric Sandeen | 54c57dc | 2007-06-20 17:15:10 -0700 | [diff] [blame] | 973 | zero_user_page(page, start, end - start, KM_USER0); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 974 | set_buffer_uptodate(bh); |
| 975 | } |
| 976 | |
| 977 | clear_buffer_new(bh); |
| 978 | mark_buffer_dirty(bh); |
| 979 | } |
| 980 | } |
| 981 | |
| 982 | block_start = block_end; |
| 983 | bh = bh->b_this_page; |
| 984 | } while (bh != head); |
| 985 | } |
| 986 | |
| 987 | /* |
| 988 | * Only called when we have a failure during allocating write to write |
| 989 | * zero's to the newly allocated region. |
| 990 | */ |
| 991 | static void ocfs2_write_failure(struct inode *inode, |
| 992 | struct ocfs2_write_ctxt *wc, |
| 993 | loff_t user_pos, unsigned user_len) |
| 994 | { |
| 995 | int i; |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame] | 996 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
| 997 | to = user_pos + user_len; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 998 | struct page *tmppage; |
| 999 | |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame] | 1000 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1001 | |
| 1002 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1003 | tmppage = wc->w_pages[i]; |
| 1004 | |
| 1005 | if (ocfs2_should_order_data(inode)) |
| 1006 | walk_page_buffers(wc->w_handle, page_buffers(tmppage), |
| 1007 | from, to, NULL, |
| 1008 | ocfs2_journal_dirty_data); |
| 1009 | |
| 1010 | block_commit_write(tmppage, from, to); |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
| 1015 | struct ocfs2_write_ctxt *wc, |
| 1016 | struct page *page, u32 cpos, |
| 1017 | loff_t user_pos, unsigned user_len, |
| 1018 | int new) |
| 1019 | { |
| 1020 | int ret; |
| 1021 | unsigned int map_from = 0, map_to = 0; |
| 1022 | unsigned int cluster_start, cluster_end; |
| 1023 | unsigned int user_data_from = 0, user_data_to = 0; |
| 1024 | |
| 1025 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1026 | &cluster_start, &cluster_end); |
| 1027 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1028 | if (page == wc->w_target_page) { |
| 1029 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); |
| 1030 | map_to = map_from + user_len; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1031 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1032 | if (new) |
| 1033 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 1034 | cluster_start, cluster_end, |
| 1035 | new); |
| 1036 | else |
| 1037 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 1038 | map_from, map_to, new); |
| 1039 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1040 | mlog_errno(ret); |
| 1041 | goto out; |
| 1042 | } |
| 1043 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1044 | user_data_from = map_from; |
| 1045 | user_data_to = map_to; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1046 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1047 | map_from = cluster_start; |
| 1048 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1049 | } |
| 1050 | } else { |
| 1051 | /* |
| 1052 | * If we haven't allocated the new page yet, we |
| 1053 | * shouldn't be writing it out without copying user |
| 1054 | * data. This is likely a math error from the caller. |
| 1055 | */ |
| 1056 | BUG_ON(!new); |
| 1057 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1058 | map_from = cluster_start; |
| 1059 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1060 | |
| 1061 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1062 | cluster_start, cluster_end, new); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1063 | if (ret) { |
| 1064 | mlog_errno(ret); |
| 1065 | goto out; |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * Parts of newly allocated pages need to be zero'd. |
| 1071 | * |
| 1072 | * Above, we have also rewritten 'to' and 'from' - as far as |
| 1073 | * the rest of the function is concerned, the entire cluster |
| 1074 | * range inside of a page needs to be written. |
| 1075 | * |
| 1076 | * We can skip this if the page is up to date - it's already |
| 1077 | * been zero'd from being read in as a hole. |
| 1078 | */ |
| 1079 | if (new && !PageUptodate(page)) |
| 1080 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1081 | cpos, user_data_from, user_data_to); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1082 | |
| 1083 | flush_dcache_page(page); |
| 1084 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1085 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1086 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1090 | * This function will only grab one clusters worth of pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1091 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1092 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
| 1093 | struct ocfs2_write_ctxt *wc, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1094 | u32 cpos, loff_t user_pos, int new, |
| 1095 | struct page *mmap_page) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1096 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1097 | int ret = 0, i; |
| 1098 | unsigned long start, target_index, index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1099 | struct inode *inode = mapping->host; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1100 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1101 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1102 | |
| 1103 | /* |
| 1104 | * Figure out how many pages we'll be manipulating here. For |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 1105 | * non allocating write, we just change the one |
| 1106 | * page. Otherwise, we'll need a whole clusters worth. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1107 | */ |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1108 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1109 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
| 1110 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1111 | } else { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1112 | wc->w_num_pages = 1; |
| 1113 | start = target_index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1114 | } |
| 1115 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1116 | for(i = 0; i < wc->w_num_pages; i++) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1117 | index = start + i; |
| 1118 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1119 | if (index == target_index && mmap_page) { |
| 1120 | /* |
| 1121 | * ocfs2_pagemkwrite() is a little different |
| 1122 | * and wants us to directly use the page |
| 1123 | * passed in. |
| 1124 | */ |
| 1125 | lock_page(mmap_page); |
| 1126 | |
| 1127 | if (mmap_page->mapping != mapping) { |
| 1128 | unlock_page(mmap_page); |
| 1129 | /* |
| 1130 | * Sanity check - the locking in |
| 1131 | * ocfs2_pagemkwrite() should ensure |
| 1132 | * that this code doesn't trigger. |
| 1133 | */ |
| 1134 | ret = -EINVAL; |
| 1135 | mlog_errno(ret); |
| 1136 | goto out; |
| 1137 | } |
| 1138 | |
| 1139 | page_cache_get(mmap_page); |
| 1140 | wc->w_pages[i] = mmap_page; |
| 1141 | } else { |
| 1142 | wc->w_pages[i] = find_or_create_page(mapping, index, |
| 1143 | GFP_NOFS); |
| 1144 | if (!wc->w_pages[i]) { |
| 1145 | ret = -ENOMEM; |
| 1146 | mlog_errno(ret); |
| 1147 | goto out; |
| 1148 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1149 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1150 | |
| 1151 | if (index == target_index) |
| 1152 | wc->w_target_page = wc->w_pages[i]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1153 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1154 | out: |
| 1155 | return ret; |
| 1156 | } |
| 1157 | |
| 1158 | /* |
| 1159 | * Prepare a single cluster for write one cluster into the file. |
| 1160 | */ |
| 1161 | static int ocfs2_write_cluster(struct address_space *mapping, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1162 | u32 phys, unsigned int unwritten, |
| 1163 | struct ocfs2_alloc_context *data_ac, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1164 | struct ocfs2_alloc_context *meta_ac, |
| 1165 | struct ocfs2_write_ctxt *wc, u32 cpos, |
| 1166 | loff_t user_pos, unsigned user_len) |
| 1167 | { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1168 | int ret, i, new, should_zero = 0; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1169 | u64 v_blkno, p_blkno; |
| 1170 | struct inode *inode = mapping->host; |
| 1171 | |
| 1172 | new = phys == 0 ? 1 : 0; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1173 | if (new || unwritten) |
| 1174 | should_zero = 1; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1175 | |
| 1176 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1177 | u32 tmp_pos; |
| 1178 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1179 | /* |
| 1180 | * This is safe to call with the page locks - it won't take |
| 1181 | * any additional semaphores or cluster locks. |
| 1182 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1183 | tmp_pos = cpos; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1184 | ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode, |
Mark Fasheh | 2ae99a6 | 2007-03-09 16:43:28 -0800 | [diff] [blame] | 1185 | &tmp_pos, 1, 0, wc->w_di_bh, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1186 | wc->w_handle, data_ac, |
| 1187 | meta_ac, NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1188 | /* |
| 1189 | * This shouldn't happen because we must have already |
| 1190 | * calculated the correct meta data allocation required. The |
| 1191 | * internal tree allocation code should know how to increase |
| 1192 | * transaction credits itself. |
| 1193 | * |
| 1194 | * If need be, we could handle -EAGAIN for a |
| 1195 | * RESTART_TRANS here. |
| 1196 | */ |
| 1197 | mlog_bug_on_msg(ret == -EAGAIN, |
| 1198 | "Inode %llu: EAGAIN return during allocation.\n", |
| 1199 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 1200 | if (ret < 0) { |
| 1201 | mlog_errno(ret); |
| 1202 | goto out; |
| 1203 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1204 | } else if (unwritten) { |
| 1205 | ret = ocfs2_mark_extent_written(inode, wc->w_di_bh, |
| 1206 | wc->w_handle, cpos, 1, phys, |
| 1207 | meta_ac, &wc->w_dealloc); |
| 1208 | if (ret < 0) { |
| 1209 | mlog_errno(ret); |
| 1210 | goto out; |
| 1211 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1212 | } |
| 1213 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1214 | if (should_zero) |
| 1215 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
| 1216 | else |
| 1217 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
| 1218 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1219 | /* |
| 1220 | * The only reason this should fail is due to an inability to |
| 1221 | * find the extent added. |
| 1222 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 1223 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
| 1224 | NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1225 | if (ret < 0) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1226 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
| 1227 | "at logical block %llu", |
| 1228 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1229 | (unsigned long long)v_blkno); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1230 | goto out; |
| 1231 | } |
| 1232 | |
| 1233 | BUG_ON(p_blkno == 0); |
| 1234 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1235 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1236 | int tmpret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1237 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1238 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
| 1239 | wc->w_pages[i], cpos, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1240 | user_pos, user_len, |
| 1241 | should_zero); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1242 | if (tmpret) { |
| 1243 | mlog_errno(tmpret); |
| 1244 | if (ret == 0) |
| 1245 | tmpret = ret; |
| 1246 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1247 | } |
| 1248 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1249 | /* |
| 1250 | * We only have cleanup to do in case of allocating write. |
| 1251 | */ |
| 1252 | if (ret && new) |
| 1253 | ocfs2_write_failure(inode, wc, user_pos, user_len); |
| 1254 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1255 | out: |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1256 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1257 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1258 | } |
| 1259 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1260 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
| 1261 | struct ocfs2_alloc_context *data_ac, |
| 1262 | struct ocfs2_alloc_context *meta_ac, |
| 1263 | struct ocfs2_write_ctxt *wc, |
| 1264 | loff_t pos, unsigned len) |
| 1265 | { |
| 1266 | int ret, i; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1267 | loff_t cluster_off; |
| 1268 | unsigned int local_len = len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1269 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1270 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1271 | |
| 1272 | for (i = 0; i < wc->w_clen; i++) { |
| 1273 | desc = &wc->w_desc[i]; |
| 1274 | |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1275 | /* |
| 1276 | * We have to make sure that the total write passed in |
| 1277 | * doesn't extend past a single cluster. |
| 1278 | */ |
| 1279 | local_len = len; |
| 1280 | cluster_off = pos & (osb->s_clustersize - 1); |
| 1281 | if ((cluster_off + local_len) > osb->s_clustersize) |
| 1282 | local_len = osb->s_clustersize - cluster_off; |
| 1283 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1284 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
| 1285 | desc->c_unwritten, data_ac, meta_ac, |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1286 | wc, desc->c_cpos, pos, local_len); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1287 | if (ret) { |
| 1288 | mlog_errno(ret); |
| 1289 | goto out; |
| 1290 | } |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1291 | |
| 1292 | len -= local_len; |
| 1293 | pos += local_len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1294 | } |
| 1295 | |
| 1296 | ret = 0; |
| 1297 | out: |
| 1298 | return ret; |
| 1299 | } |
| 1300 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1301 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1302 | * ocfs2_write_end() wants to know which parts of the target page it |
| 1303 | * should complete the write on. It's easiest to compute them ahead of |
| 1304 | * time when a more complete view of the write is available. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1305 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1306 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, |
| 1307 | struct ocfs2_write_ctxt *wc, |
| 1308 | loff_t pos, unsigned len, int alloc) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1309 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1310 | struct ocfs2_write_cluster_desc *desc; |
| 1311 | |
| 1312 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
| 1313 | wc->w_target_to = wc->w_target_from + len; |
| 1314 | |
| 1315 | if (alloc == 0) |
| 1316 | return; |
| 1317 | |
| 1318 | /* |
| 1319 | * Allocating write - we may have different boundaries based |
| 1320 | * on page size and cluster size. |
| 1321 | * |
| 1322 | * NOTE: We can no longer compute one value from the other as |
| 1323 | * the actual write length and user provided length may be |
| 1324 | * different. |
| 1325 | */ |
| 1326 | |
| 1327 | if (wc->w_large_pages) { |
| 1328 | /* |
| 1329 | * We only care about the 1st and last cluster within |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1330 | * our range and whether they should be zero'd or not. Either |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1331 | * value may be extended out to the start/end of a |
| 1332 | * newly allocated cluster. |
| 1333 | */ |
| 1334 | desc = &wc->w_desc[0]; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1335 | if (ocfs2_should_zero_cluster(desc)) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1336 | ocfs2_figure_cluster_boundaries(osb, |
| 1337 | desc->c_cpos, |
| 1338 | &wc->w_target_from, |
| 1339 | NULL); |
| 1340 | |
| 1341 | desc = &wc->w_desc[wc->w_clen - 1]; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1342 | if (ocfs2_should_zero_cluster(desc)) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1343 | ocfs2_figure_cluster_boundaries(osb, |
| 1344 | desc->c_cpos, |
| 1345 | NULL, |
| 1346 | &wc->w_target_to); |
| 1347 | } else { |
| 1348 | wc->w_target_from = 0; |
| 1349 | wc->w_target_to = PAGE_CACHE_SIZE; |
| 1350 | } |
| 1351 | } |
| 1352 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1353 | /* |
| 1354 | * Populate each single-cluster write descriptor in the write context |
| 1355 | * with information about the i/o to be done. |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1356 | * |
| 1357 | * Returns the number of clusters that will have to be allocated, as |
| 1358 | * well as a worst case estimate of the number of extent records that |
| 1359 | * would have to be created during a write to an unwritten region. |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1360 | */ |
| 1361 | static int ocfs2_populate_write_desc(struct inode *inode, |
| 1362 | struct ocfs2_write_ctxt *wc, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1363 | unsigned int *clusters_to_alloc, |
| 1364 | unsigned int *extents_to_split) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1365 | { |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1366 | int ret; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1367 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1368 | unsigned int num_clusters = 0; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1369 | unsigned int ext_flags = 0; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1370 | u32 phys = 0; |
| 1371 | int i; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1372 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1373 | *clusters_to_alloc = 0; |
| 1374 | *extents_to_split = 0; |
| 1375 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1376 | for (i = 0; i < wc->w_clen; i++) { |
| 1377 | desc = &wc->w_desc[i]; |
| 1378 | desc->c_cpos = wc->w_cpos + i; |
| 1379 | |
| 1380 | if (num_clusters == 0) { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1381 | /* |
| 1382 | * Need to look up the next extent record. |
| 1383 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1384 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1385 | &num_clusters, &ext_flags); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1386 | if (ret) { |
| 1387 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1388 | goto out; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1389 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1390 | |
| 1391 | /* |
| 1392 | * Assume worst case - that we're writing in |
| 1393 | * the middle of the extent. |
| 1394 | * |
| 1395 | * We can assume that the write proceeds from |
| 1396 | * left to right, in which case the extent |
| 1397 | * insert code is smart enough to coalesce the |
| 1398 | * next splits into the previous records created. |
| 1399 | */ |
| 1400 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1401 | *extents_to_split = *extents_to_split + 2; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1402 | } else if (phys) { |
| 1403 | /* |
| 1404 | * Only increment phys if it doesn't describe |
| 1405 | * a hole. |
| 1406 | */ |
| 1407 | phys++; |
| 1408 | } |
| 1409 | |
| 1410 | desc->c_phys = phys; |
| 1411 | if (phys == 0) { |
| 1412 | desc->c_new = 1; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1413 | *clusters_to_alloc = *clusters_to_alloc + 1; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1414 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1415 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1416 | desc->c_unwritten = 1; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1417 | |
| 1418 | num_clusters--; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1419 | } |
| 1420 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1421 | ret = 0; |
| 1422 | out: |
| 1423 | return ret; |
| 1424 | } |
| 1425 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1426 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
| 1427 | struct inode *inode, |
| 1428 | struct ocfs2_write_ctxt *wc) |
| 1429 | { |
| 1430 | int ret; |
| 1431 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1432 | struct page *page; |
| 1433 | handle_t *handle; |
| 1434 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1435 | |
| 1436 | page = find_or_create_page(mapping, 0, GFP_NOFS); |
| 1437 | if (!page) { |
| 1438 | ret = -ENOMEM; |
| 1439 | mlog_errno(ret); |
| 1440 | goto out; |
| 1441 | } |
| 1442 | /* |
| 1443 | * If we don't set w_num_pages then this page won't get unlocked |
| 1444 | * and freed on cleanup of the write context. |
| 1445 | */ |
| 1446 | wc->w_pages[0] = wc->w_target_page = page; |
| 1447 | wc->w_num_pages = 1; |
| 1448 | |
| 1449 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| 1450 | if (IS_ERR(handle)) { |
| 1451 | ret = PTR_ERR(handle); |
| 1452 | mlog_errno(ret); |
| 1453 | goto out; |
| 1454 | } |
| 1455 | |
| 1456 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, |
| 1457 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1458 | if (ret) { |
| 1459 | ocfs2_commit_trans(osb, handle); |
| 1460 | |
| 1461 | mlog_errno(ret); |
| 1462 | goto out; |
| 1463 | } |
| 1464 | |
| 1465 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 1466 | ocfs2_set_inode_data_inline(inode, di); |
| 1467 | |
| 1468 | if (!PageUptodate(page)) { |
| 1469 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); |
| 1470 | if (ret) { |
| 1471 | ocfs2_commit_trans(osb, handle); |
| 1472 | |
| 1473 | goto out; |
| 1474 | } |
| 1475 | } |
| 1476 | |
| 1477 | wc->w_handle = handle; |
| 1478 | out: |
| 1479 | return ret; |
| 1480 | } |
| 1481 | |
| 1482 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) |
| 1483 | { |
| 1484 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 1485 | |
Mark Fasheh | 0d8a4e0 | 2007-11-20 11:48:41 -0800 | [diff] [blame] | 1486 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1487 | return 1; |
| 1488 | return 0; |
| 1489 | } |
| 1490 | |
| 1491 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, |
| 1492 | struct inode *inode, loff_t pos, |
| 1493 | unsigned len, struct page *mmap_page, |
| 1494 | struct ocfs2_write_ctxt *wc) |
| 1495 | { |
| 1496 | int ret, written = 0; |
| 1497 | loff_t end = pos + len; |
| 1498 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1499 | |
| 1500 | mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n", |
| 1501 | (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, |
| 1502 | oi->ip_dyn_features); |
| 1503 | |
| 1504 | /* |
| 1505 | * Handle inodes which already have inline data 1st. |
| 1506 | */ |
| 1507 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1508 | if (mmap_page == NULL && |
| 1509 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) |
| 1510 | goto do_inline_write; |
| 1511 | |
| 1512 | /* |
| 1513 | * The write won't fit - we have to give this inode an |
| 1514 | * inline extent list now. |
| 1515 | */ |
| 1516 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); |
| 1517 | if (ret) |
| 1518 | mlog_errno(ret); |
| 1519 | goto out; |
| 1520 | } |
| 1521 | |
| 1522 | /* |
| 1523 | * Check whether the inode can accept inline data. |
| 1524 | */ |
| 1525 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) |
| 1526 | return 0; |
| 1527 | |
| 1528 | /* |
| 1529 | * Check whether the write can fit. |
| 1530 | */ |
| 1531 | if (mmap_page || end > ocfs2_max_inline_data(inode->i_sb)) |
| 1532 | return 0; |
| 1533 | |
| 1534 | do_inline_write: |
| 1535 | ret = ocfs2_write_begin_inline(mapping, inode, wc); |
| 1536 | if (ret) { |
| 1537 | mlog_errno(ret); |
| 1538 | goto out; |
| 1539 | } |
| 1540 | |
| 1541 | /* |
| 1542 | * This signals to the caller that the data can be written |
| 1543 | * inline. |
| 1544 | */ |
| 1545 | written = 1; |
| 1546 | out: |
| 1547 | return written ? written : ret; |
| 1548 | } |
| 1549 | |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1550 | /* |
| 1551 | * This function only does anything for file systems which can't |
| 1552 | * handle sparse files. |
| 1553 | * |
| 1554 | * What we want to do here is fill in any hole between the current end |
| 1555 | * of allocation and the end of our write. That way the rest of the |
| 1556 | * write path can treat it as an non-allocating write, which has no |
| 1557 | * special case code for sparse/nonsparse files. |
| 1558 | */ |
| 1559 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos, |
| 1560 | unsigned len, |
| 1561 | struct ocfs2_write_ctxt *wc) |
| 1562 | { |
| 1563 | int ret; |
| 1564 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1565 | loff_t newsize = pos + len; |
| 1566 | |
| 1567 | if (ocfs2_sparse_alloc(osb)) |
| 1568 | return 0; |
| 1569 | |
| 1570 | if (newsize <= i_size_read(inode)) |
| 1571 | return 0; |
| 1572 | |
| 1573 | ret = ocfs2_extend_no_holes(inode, newsize, newsize - len); |
| 1574 | if (ret) |
| 1575 | mlog_errno(ret); |
| 1576 | |
| 1577 | return ret; |
| 1578 | } |
| 1579 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1580 | int ocfs2_write_begin_nolock(struct address_space *mapping, |
| 1581 | loff_t pos, unsigned len, unsigned flags, |
| 1582 | struct page **pagep, void **fsdata, |
| 1583 | struct buffer_head *di_bh, struct page *mmap_page) |
| 1584 | { |
| 1585 | int ret, credits = OCFS2_INODE_UPDATE_CREDITS; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1586 | unsigned int clusters_to_alloc, extents_to_split; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1587 | struct ocfs2_write_ctxt *wc; |
| 1588 | struct inode *inode = mapping->host; |
| 1589 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1590 | struct ocfs2_dinode *di; |
| 1591 | struct ocfs2_alloc_context *data_ac = NULL; |
| 1592 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 1593 | handle_t *handle; |
| 1594 | |
| 1595 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); |
| 1596 | if (ret) { |
| 1597 | mlog_errno(ret); |
| 1598 | return ret; |
| 1599 | } |
| 1600 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1601 | if (ocfs2_supports_inline_data(osb)) { |
| 1602 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, |
| 1603 | mmap_page, wc); |
| 1604 | if (ret == 1) { |
| 1605 | ret = 0; |
| 1606 | goto success; |
| 1607 | } |
| 1608 | if (ret < 0) { |
| 1609 | mlog_errno(ret); |
| 1610 | goto out; |
| 1611 | } |
| 1612 | } |
| 1613 | |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1614 | ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc); |
| 1615 | if (ret) { |
| 1616 | mlog_errno(ret); |
| 1617 | goto out; |
| 1618 | } |
| 1619 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1620 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
| 1621 | &extents_to_split); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1622 | if (ret) { |
| 1623 | mlog_errno(ret); |
| 1624 | goto out; |
| 1625 | } |
| 1626 | |
| 1627 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1628 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1629 | /* |
| 1630 | * We set w_target_from, w_target_to here so that |
| 1631 | * ocfs2_write_end() knows which range in the target page to |
| 1632 | * write out. An allocation requires that we write the entire |
| 1633 | * cluster range. |
| 1634 | */ |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1635 | if (clusters_to_alloc || extents_to_split) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1636 | /* |
| 1637 | * XXX: We are stretching the limits of |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1638 | * ocfs2_lock_allocators(). It greatly over-estimates |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1639 | * the work to be done. |
| 1640 | */ |
| 1641 | ret = ocfs2_lock_allocators(inode, di, clusters_to_alloc, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1642 | extents_to_split, &data_ac, &meta_ac); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1643 | if (ret) { |
| 1644 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1645 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1646 | } |
| 1647 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1648 | credits = ocfs2_calc_extend_credits(inode->i_sb, di, |
| 1649 | clusters_to_alloc); |
| 1650 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1651 | } |
| 1652 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1653 | ocfs2_set_target_boundaries(osb, wc, pos, len, |
| 1654 | clusters_to_alloc + extents_to_split); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1655 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1656 | handle = ocfs2_start_trans(osb, credits); |
| 1657 | if (IS_ERR(handle)) { |
| 1658 | ret = PTR_ERR(handle); |
| 1659 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1660 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1661 | } |
| 1662 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1663 | wc->w_handle = handle; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1664 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1665 | /* |
| 1666 | * We don't want this to fail in ocfs2_write_end(), so do it |
| 1667 | * here. |
| 1668 | */ |
| 1669 | ret = ocfs2_journal_access(handle, inode, wc->w_di_bh, |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1670 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 1671 | if (ret) { |
| 1672 | mlog_errno(ret); |
| 1673 | goto out_commit; |
| 1674 | } |
| 1675 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1676 | /* |
| 1677 | * Fill our page array first. That way we've grabbed enough so |
| 1678 | * that we can zero and flush if we error after adding the |
| 1679 | * extent. |
| 1680 | */ |
| 1681 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1682 | clusters_to_alloc + extents_to_split, |
| 1683 | mmap_page); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1684 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1685 | mlog_errno(ret); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1686 | goto out_commit; |
| 1687 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1688 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1689 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
| 1690 | len); |
| 1691 | if (ret) { |
| 1692 | mlog_errno(ret); |
| 1693 | goto out_commit; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1694 | } |
| 1695 | |
| 1696 | if (data_ac) |
| 1697 | ocfs2_free_alloc_context(data_ac); |
| 1698 | if (meta_ac) |
| 1699 | ocfs2_free_alloc_context(meta_ac); |
| 1700 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1701 | success: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1702 | *pagep = wc->w_target_page; |
| 1703 | *fsdata = wc; |
| 1704 | return 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1705 | out_commit: |
| 1706 | ocfs2_commit_trans(osb, handle); |
| 1707 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1708 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1709 | ocfs2_free_write_ctxt(wc); |
| 1710 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1711 | if (data_ac) |
| 1712 | ocfs2_free_alloc_context(data_ac); |
| 1713 | if (meta_ac) |
| 1714 | ocfs2_free_alloc_context(meta_ac); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1715 | return ret; |
| 1716 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1717 | |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 1718 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
| 1719 | loff_t pos, unsigned len, unsigned flags, |
| 1720 | struct page **pagep, void **fsdata) |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1721 | { |
| 1722 | int ret; |
| 1723 | struct buffer_head *di_bh = NULL; |
| 1724 | struct inode *inode = mapping->host; |
| 1725 | |
| 1726 | ret = ocfs2_meta_lock(inode, &di_bh, 1); |
| 1727 | if (ret) { |
| 1728 | mlog_errno(ret); |
| 1729 | return ret; |
| 1730 | } |
| 1731 | |
| 1732 | /* |
| 1733 | * Take alloc sem here to prevent concurrent lookups. That way |
| 1734 | * the mapping, zeroing and tree manipulation within |
| 1735 | * ocfs2_write() will be safe against ->readpage(). This |
| 1736 | * should also serve to lock out allocation from a shared |
| 1737 | * writeable region. |
| 1738 | */ |
| 1739 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1740 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1741 | ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1742 | fsdata, di_bh, NULL); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1743 | if (ret) { |
| 1744 | mlog_errno(ret); |
Mark Fasheh | c934a92 | 2007-10-18 15:23:46 -0700 | [diff] [blame^] | 1745 | goto out_fail; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1746 | } |
| 1747 | |
| 1748 | brelse(di_bh); |
| 1749 | |
| 1750 | return 0; |
| 1751 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1752 | out_fail: |
| 1753 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1754 | |
| 1755 | brelse(di_bh); |
| 1756 | ocfs2_meta_unlock(inode, 1); |
| 1757 | |
| 1758 | return ret; |
| 1759 | } |
| 1760 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1761 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
| 1762 | unsigned len, unsigned *copied, |
| 1763 | struct ocfs2_dinode *di, |
| 1764 | struct ocfs2_write_ctxt *wc) |
| 1765 | { |
| 1766 | void *kaddr; |
| 1767 | |
| 1768 | if (unlikely(*copied < len)) { |
| 1769 | if (!PageUptodate(wc->w_target_page)) { |
| 1770 | *copied = 0; |
| 1771 | return; |
| 1772 | } |
| 1773 | } |
| 1774 | |
| 1775 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); |
| 1776 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); |
| 1777 | kunmap_atomic(kaddr, KM_USER0); |
| 1778 | |
| 1779 | mlog(0, "Data written to inode at offset %llu. " |
| 1780 | "id_count = %u, copied = %u, i_dyn_features = 0x%x\n", |
| 1781 | (unsigned long long)pos, *copied, |
| 1782 | le16_to_cpu(di->id2.i_data.id_count), |
| 1783 | le16_to_cpu(di->i_dyn_features)); |
| 1784 | } |
| 1785 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1786 | int ocfs2_write_end_nolock(struct address_space *mapping, |
| 1787 | loff_t pos, unsigned len, unsigned copied, |
| 1788 | struct page *page, void *fsdata) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1789 | { |
| 1790 | int i; |
| 1791 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); |
| 1792 | struct inode *inode = mapping->host; |
| 1793 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1794 | struct ocfs2_write_ctxt *wc = fsdata; |
| 1795 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1796 | handle_t *handle = wc->w_handle; |
| 1797 | struct page *tmppage; |
| 1798 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1799 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1800 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); |
| 1801 | goto out_write_size; |
| 1802 | } |
| 1803 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1804 | if (unlikely(copied < len)) { |
| 1805 | if (!PageUptodate(wc->w_target_page)) |
| 1806 | copied = 0; |
| 1807 | |
| 1808 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, |
| 1809 | start+len); |
| 1810 | } |
| 1811 | flush_dcache_page(wc->w_target_page); |
| 1812 | |
| 1813 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1814 | tmppage = wc->w_pages[i]; |
| 1815 | |
| 1816 | if (tmppage == wc->w_target_page) { |
| 1817 | from = wc->w_target_from; |
| 1818 | to = wc->w_target_to; |
| 1819 | |
| 1820 | BUG_ON(from > PAGE_CACHE_SIZE || |
| 1821 | to > PAGE_CACHE_SIZE || |
| 1822 | to < from); |
| 1823 | } else { |
| 1824 | /* |
| 1825 | * Pages adjacent to the target (if any) imply |
| 1826 | * a hole-filling write in which case we want |
| 1827 | * to flush their entire range. |
| 1828 | */ |
| 1829 | from = 0; |
| 1830 | to = PAGE_CACHE_SIZE; |
| 1831 | } |
| 1832 | |
| 1833 | if (ocfs2_should_order_data(inode)) |
| 1834 | walk_page_buffers(wc->w_handle, page_buffers(tmppage), |
| 1835 | from, to, NULL, |
| 1836 | ocfs2_journal_dirty_data); |
| 1837 | |
| 1838 | block_commit_write(tmppage, from, to); |
| 1839 | } |
| 1840 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1841 | out_write_size: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1842 | pos += copied; |
| 1843 | if (pos > inode->i_size) { |
| 1844 | i_size_write(inode, pos); |
| 1845 | mark_inode_dirty(inode); |
| 1846 | } |
| 1847 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
| 1848 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
| 1849 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1850 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
| 1851 | 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] | 1852 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
| 1853 | |
| 1854 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | 59a5e41 | 2007-06-22 15:52:36 -0700 | [diff] [blame] | 1855 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1856 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
| 1857 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1858 | ocfs2_free_write_ctxt(wc); |
| 1859 | |
| 1860 | return copied; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1861 | } |
| 1862 | |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 1863 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
| 1864 | loff_t pos, unsigned len, unsigned copied, |
| 1865 | struct page *page, void *fsdata) |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1866 | { |
| 1867 | int ret; |
| 1868 | struct inode *inode = mapping->host; |
| 1869 | |
| 1870 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); |
| 1871 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1872 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1873 | ocfs2_meta_unlock(inode, 1); |
| 1874 | |
| 1875 | return ret; |
| 1876 | } |
| 1877 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1878 | const struct address_space_operations ocfs2_aops = { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1879 | .readpage = ocfs2_readpage, |
| 1880 | .writepage = ocfs2_writepage, |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 1881 | .write_begin = ocfs2_write_begin, |
| 1882 | .write_end = ocfs2_write_end, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1883 | .bmap = ocfs2_bmap, |
| 1884 | .sync_page = block_sync_page, |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 1885 | .direct_IO = ocfs2_direct_IO, |
| 1886 | .invalidatepage = ocfs2_invalidatepage, |
| 1887 | .releasepage = ocfs2_releasepage, |
| 1888 | .migratepage = buffer_migrate_page, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1889 | }; |