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 | 628a24f | 2007-10-30 12:08:32 -0700 | [diff] [blame] | 29 | #include <linux/mpage.h> |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 30 | #include <linux/quotaops.h> |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 31 | |
| 32 | #define MLOG_MASK_PREFIX ML_FILE_IO |
| 33 | #include <cluster/masklog.h> |
| 34 | |
| 35 | #include "ocfs2.h" |
| 36 | |
| 37 | #include "alloc.h" |
| 38 | #include "aops.h" |
| 39 | #include "dlmglue.h" |
| 40 | #include "extent_map.h" |
| 41 | #include "file.h" |
| 42 | #include "inode.h" |
| 43 | #include "journal.h" |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 44 | #include "suballoc.h" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 45 | #include "super.h" |
| 46 | #include "symlink.h" |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 47 | #include "refcounttree.h" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 48 | |
| 49 | #include "buffer_head_io.h" |
| 50 | |
| 51 | static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, |
| 52 | struct buffer_head *bh_result, int create) |
| 53 | { |
| 54 | int err = -EIO; |
| 55 | int status; |
| 56 | struct ocfs2_dinode *fe = NULL; |
| 57 | struct buffer_head *bh = NULL; |
| 58 | struct buffer_head *buffer_cache_bh = NULL; |
| 59 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 60 | void *kaddr; |
| 61 | |
| 62 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, |
| 63 | (unsigned long long)iblock, bh_result, create); |
| 64 | |
| 65 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); |
| 66 | |
| 67 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { |
| 68 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", |
| 69 | (unsigned long long)iblock); |
| 70 | goto bail; |
| 71 | } |
| 72 | |
Joel Becker | b657c95 | 2008-11-13 14:49:11 -0800 | [diff] [blame] | 73 | status = ocfs2_read_inode_block(inode, &bh); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 74 | if (status < 0) { |
| 75 | mlog_errno(status); |
| 76 | goto bail; |
| 77 | } |
| 78 | fe = (struct ocfs2_dinode *) bh->b_data; |
| 79 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 80 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
| 81 | le32_to_cpu(fe->i_clusters))) { |
| 82 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
| 83 | "%llu\n", (unsigned long long)iblock); |
| 84 | goto bail; |
| 85 | } |
| 86 | |
| 87 | /* We don't use the page cache to create symlink data, so if |
| 88 | * need be, copy it over from the buffer cache. */ |
| 89 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { |
| 90 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + |
| 91 | iblock; |
| 92 | buffer_cache_bh = sb_getblk(osb->sb, blkno); |
| 93 | if (!buffer_cache_bh) { |
| 94 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
| 95 | goto bail; |
| 96 | } |
| 97 | |
| 98 | /* we haven't locked out transactions, so a commit |
| 99 | * could've happened. Since we've got a reference on |
| 100 | * the bh, even if it commits while we're doing the |
| 101 | * copy, the data is still good. */ |
| 102 | if (buffer_jbd(buffer_cache_bh) |
| 103 | && ocfs2_inode_is_new(inode)) { |
| 104 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); |
| 105 | if (!kaddr) { |
| 106 | mlog(ML_ERROR, "couldn't kmap!\n"); |
| 107 | goto bail; |
| 108 | } |
| 109 | memcpy(kaddr + (bh_result->b_size * iblock), |
| 110 | buffer_cache_bh->b_data, |
| 111 | bh_result->b_size); |
| 112 | kunmap_atomic(kaddr, KM_USER0); |
| 113 | set_buffer_uptodate(bh_result); |
| 114 | } |
| 115 | brelse(buffer_cache_bh); |
| 116 | } |
| 117 | |
| 118 | map_bh(bh_result, inode->i_sb, |
| 119 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); |
| 120 | |
| 121 | err = 0; |
| 122 | |
| 123 | bail: |
Mark Fasheh | a81cb88 | 2008-10-07 14:25:16 -0700 | [diff] [blame] | 124 | brelse(bh); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 125 | |
| 126 | mlog_exit(err); |
| 127 | return err; |
| 128 | } |
| 129 | |
Tao Ma | 6f70fa5 | 2009-08-25 08:05:12 +0800 | [diff] [blame] | 130 | int ocfs2_get_block(struct inode *inode, sector_t iblock, |
| 131 | struct buffer_head *bh_result, int create) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 132 | { |
| 133 | int err = 0; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 134 | unsigned int ext_flags; |
Mark Fasheh | 628a24f | 2007-10-30 12:08:32 -0700 | [diff] [blame] | 135 | u64 max_blocks = bh_result->b_size >> inode->i_blkbits; |
| 136 | u64 p_blkno, count, past_eof; |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 137 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 138 | |
| 139 | mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode, |
| 140 | (unsigned long long)iblock, bh_result, create); |
| 141 | |
| 142 | if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) |
| 143 | mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", |
| 144 | inode, inode->i_ino); |
| 145 | |
| 146 | if (S_ISLNK(inode->i_mode)) { |
| 147 | /* this always does I/O for some reason. */ |
| 148 | err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); |
| 149 | goto bail; |
| 150 | } |
| 151 | |
Mark Fasheh | 628a24f | 2007-10-30 12:08:32 -0700 | [diff] [blame] | 152 | err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 153 | &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 154 | if (err) { |
| 155 | mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 156 | "%llu, NULL)\n", err, inode, (unsigned long long)iblock, |
| 157 | (unsigned long long)p_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 158 | goto bail; |
| 159 | } |
| 160 | |
Mark Fasheh | 628a24f | 2007-10-30 12:08:32 -0700 | [diff] [blame] | 161 | if (max_blocks < count) |
| 162 | count = max_blocks; |
| 163 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 164 | /* |
| 165 | * ocfs2 never allocates in this function - the only time we |
| 166 | * need to use BH_New is when we're extending i_size on a file |
| 167 | * system which doesn't support holes, in which case BH_New |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 168 | * allows __block_write_begin() to zero. |
Coly Li | c0420ad | 2008-06-30 18:45:45 +0800 | [diff] [blame] | 169 | * |
| 170 | * If we see this on a sparse file system, then a truncate has |
| 171 | * raced us and removed the cluster. In this case, we clear |
| 172 | * the buffers dirty and uptodate bits and let the buffer code |
| 173 | * ignore it as a hole. |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 174 | */ |
Coly Li | c0420ad | 2008-06-30 18:45:45 +0800 | [diff] [blame] | 175 | if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { |
| 176 | clear_buffer_dirty(bh_result); |
| 177 | clear_buffer_uptodate(bh_result); |
| 178 | goto bail; |
| 179 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 180 | |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 181 | /* Treat the unwritten extent as a hole for zeroing purposes. */ |
| 182 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 183 | map_bh(bh_result, inode->i_sb, p_blkno); |
| 184 | |
Mark Fasheh | 628a24f | 2007-10-30 12:08:32 -0700 | [diff] [blame] | 185 | bh_result->b_size = count << inode->i_blkbits; |
| 186 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 187 | if (!ocfs2_sparse_alloc(osb)) { |
| 188 | if (p_blkno == 0) { |
| 189 | err = -EIO; |
| 190 | mlog(ML_ERROR, |
| 191 | "iblock = %llu p_blkno = %llu blkno=(%llu)\n", |
| 192 | (unsigned long long)iblock, |
| 193 | (unsigned long long)p_blkno, |
| 194 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 195 | mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); |
| 196 | dump_stack(); |
Wengang Wang | 1f4cea3 | 2009-07-13 11:38:58 +0800 | [diff] [blame] | 197 | goto bail; |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 198 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 199 | } |
| 200 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 201 | past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
| 202 | mlog(0, "Inode %lu, past_eof = %llu\n", inode->i_ino, |
| 203 | (unsigned long long)past_eof); |
| 204 | if (create && (iblock >= past_eof)) |
| 205 | set_buffer_new(bh_result); |
| 206 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 207 | bail: |
| 208 | if (err < 0) |
| 209 | err = -EIO; |
| 210 | |
| 211 | mlog_exit(err); |
| 212 | return err; |
| 213 | } |
| 214 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 215 | int ocfs2_read_inline_data(struct inode *inode, struct page *page, |
| 216 | struct buffer_head *di_bh) |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 217 | { |
| 218 | void *kaddr; |
Jan Kara | d2849fb | 2007-12-19 15:24:09 +0100 | [diff] [blame] | 219 | loff_t size; |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 220 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 221 | |
| 222 | if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { |
| 223 | ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag", |
| 224 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 225 | return -EROFS; |
| 226 | } |
| 227 | |
| 228 | size = i_size_read(inode); |
| 229 | |
| 230 | if (size > PAGE_CACHE_SIZE || |
Tiger Yang | d9ae49d | 2009-03-05 11:06:15 +0800 | [diff] [blame] | 231 | size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 232 | ocfs2_error(inode->i_sb, |
Jan Kara | d2849fb | 2007-12-19 15:24:09 +0100 | [diff] [blame] | 233 | "Inode %llu has with inline data has bad size: %Lu", |
| 234 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 235 | (unsigned long long)size); |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 236 | return -EROFS; |
| 237 | } |
| 238 | |
| 239 | kaddr = kmap_atomic(page, KM_USER0); |
| 240 | if (size) |
| 241 | memcpy(kaddr, di->id2.i_data.id_data, size); |
| 242 | /* Clear the remaining part of the page */ |
| 243 | memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); |
| 244 | flush_dcache_page(page); |
| 245 | kunmap_atomic(kaddr, KM_USER0); |
| 246 | |
| 247 | SetPageUptodate(page); |
| 248 | |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static int ocfs2_readpage_inline(struct inode *inode, struct page *page) |
| 253 | { |
| 254 | int ret; |
| 255 | struct buffer_head *di_bh = NULL; |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 256 | |
| 257 | BUG_ON(!PageLocked(page)); |
Julia Lawall | 86c838b | 2008-02-26 21:45:56 +0100 | [diff] [blame] | 258 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 259 | |
Joel Becker | b657c95 | 2008-11-13 14:49:11 -0800 | [diff] [blame] | 260 | ret = ocfs2_read_inode_block(inode, &di_bh); |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 261 | if (ret) { |
| 262 | mlog_errno(ret); |
| 263 | goto out; |
| 264 | } |
| 265 | |
| 266 | ret = ocfs2_read_inline_data(inode, page, di_bh); |
| 267 | out: |
| 268 | unlock_page(page); |
| 269 | |
| 270 | brelse(di_bh); |
| 271 | return ret; |
| 272 | } |
| 273 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 274 | static int ocfs2_readpage(struct file *file, struct page *page) |
| 275 | { |
| 276 | struct inode *inode = page->mapping->host; |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 277 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 278 | loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 279 | int ret, unlock = 1; |
| 280 | |
| 281 | mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0)); |
| 282 | |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 283 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 284 | if (ret != 0) { |
| 285 | if (ret == AOP_TRUNCATED_PAGE) |
| 286 | unlock = 0; |
| 287 | mlog_errno(ret); |
| 288 | goto out; |
| 289 | } |
| 290 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 291 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 292 | ret = AOP_TRUNCATED_PAGE; |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 293 | goto out_inode_unlock; |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 294 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 295 | |
| 296 | /* |
| 297 | * i_size might have just been updated as we grabed the meta lock. We |
| 298 | * might now be discovering a truncate that hit on another node. |
| 299 | * block_read_full_page->get_block freaks out if it is asked to read |
| 300 | * beyond the end of a file, so we check here. Callers |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 301 | * (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] | 302 | * and notice that the page they just read isn't needed. |
| 303 | * |
| 304 | * XXX sys_readahead() seems to get that wrong? |
| 305 | */ |
| 306 | if (start >= i_size_read(inode)) { |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 307 | zero_user(page, 0, PAGE_SIZE); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 308 | SetPageUptodate(page); |
| 309 | ret = 0; |
| 310 | goto out_alloc; |
| 311 | } |
| 312 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 313 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 314 | ret = ocfs2_readpage_inline(inode, page); |
| 315 | else |
| 316 | ret = block_read_full_page(page, ocfs2_get_block); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 317 | unlock = 0; |
| 318 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 319 | out_alloc: |
| 320 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 321 | out_inode_unlock: |
| 322 | ocfs2_inode_unlock(inode, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 323 | out: |
| 324 | if (unlock) |
| 325 | unlock_page(page); |
| 326 | mlog_exit(ret); |
| 327 | return ret; |
| 328 | } |
| 329 | |
Mark Fasheh | 628a24f | 2007-10-30 12:08:32 -0700 | [diff] [blame] | 330 | /* |
| 331 | * This is used only for read-ahead. Failures or difficult to handle |
| 332 | * situations are safe to ignore. |
| 333 | * |
| 334 | * Right now, we don't bother with BH_Boundary - in-inode extent lists |
| 335 | * are quite large (243 extents on 4k blocks), so most inodes don't |
| 336 | * grow out to a tree. If need be, detecting boundary extents could |
| 337 | * trivially be added in a future version of ocfs2_get_block(). |
| 338 | */ |
| 339 | static int ocfs2_readpages(struct file *filp, struct address_space *mapping, |
| 340 | struct list_head *pages, unsigned nr_pages) |
| 341 | { |
| 342 | int ret, err = -EIO; |
| 343 | struct inode *inode = mapping->host; |
| 344 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 345 | loff_t start; |
| 346 | struct page *last; |
| 347 | |
| 348 | /* |
| 349 | * Use the nonblocking flag for the dlm code to avoid page |
| 350 | * lock inversion, but don't bother with retrying. |
| 351 | */ |
| 352 | ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); |
| 353 | if (ret) |
| 354 | return err; |
| 355 | |
| 356 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
| 357 | ocfs2_inode_unlock(inode, 0); |
| 358 | return err; |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * Don't bother with inline-data. There isn't anything |
| 363 | * to read-ahead in that case anyway... |
| 364 | */ |
| 365 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 366 | goto out_unlock; |
| 367 | |
| 368 | /* |
| 369 | * Check whether a remote node truncated this file - we just |
| 370 | * drop out in that case as it's not worth handling here. |
| 371 | */ |
| 372 | last = list_entry(pages->prev, struct page, lru); |
| 373 | start = (loff_t)last->index << PAGE_CACHE_SHIFT; |
| 374 | if (start >= i_size_read(inode)) |
| 375 | goto out_unlock; |
| 376 | |
| 377 | err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); |
| 378 | |
| 379 | out_unlock: |
| 380 | up_read(&oi->ip_alloc_sem); |
| 381 | ocfs2_inode_unlock(inode, 0); |
| 382 | |
| 383 | return err; |
| 384 | } |
| 385 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 386 | /* Note: Because we don't support holes, our allocation has |
| 387 | * already happened (allocation writes zeros to the file data) |
| 388 | * so we don't have to worry about ordered writes in |
| 389 | * ocfs2_writepage. |
| 390 | * |
| 391 | * ->writepage is called during the process of invalidating the page cache |
| 392 | * during blocked lock processing. It can't block on any cluster locks |
| 393 | * to during block mapping. It's relying on the fact that the block |
| 394 | * mapping can't have disappeared under the dirty pages that it is |
| 395 | * being asked to write back. |
| 396 | */ |
| 397 | static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) |
| 398 | { |
| 399 | int ret; |
| 400 | |
| 401 | mlog_entry("(0x%p)\n", page); |
| 402 | |
| 403 | ret = block_write_full_page(page, ocfs2_get_block, wbc); |
| 404 | |
| 405 | mlog_exit(ret); |
| 406 | |
| 407 | return ret; |
| 408 | } |
| 409 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 410 | /* Taken from ext3. We don't necessarily need the full blown |
| 411 | * functionality yet, but IMHO it's better to cut and paste the whole |
| 412 | * thing so we can avoid introducing our own bugs (and easily pick up |
| 413 | * their fixes when they happen) --Mark */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 414 | int walk_page_buffers( handle_t *handle, |
| 415 | struct buffer_head *head, |
| 416 | unsigned from, |
| 417 | unsigned to, |
| 418 | int *partial, |
| 419 | int (*fn)( handle_t *handle, |
| 420 | struct buffer_head *bh)) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 421 | { |
| 422 | struct buffer_head *bh; |
| 423 | unsigned block_start, block_end; |
| 424 | unsigned blocksize = head->b_size; |
| 425 | int err, ret = 0; |
| 426 | struct buffer_head *next; |
| 427 | |
| 428 | for ( bh = head, block_start = 0; |
| 429 | ret == 0 && (bh != head || !block_start); |
| 430 | block_start = block_end, bh = next) |
| 431 | { |
| 432 | next = bh->b_this_page; |
| 433 | block_end = block_start + blocksize; |
| 434 | if (block_end <= from || block_start >= to) { |
| 435 | if (partial && !buffer_uptodate(bh)) |
| 436 | *partial = 1; |
| 437 | continue; |
| 438 | } |
| 439 | err = (*fn)(handle, bh); |
| 440 | if (!ret) |
| 441 | ret = err; |
| 442 | } |
| 443 | return ret; |
| 444 | } |
| 445 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 446 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
| 447 | { |
| 448 | sector_t status; |
| 449 | u64 p_blkno = 0; |
| 450 | int err = 0; |
| 451 | struct inode *inode = mapping->host; |
| 452 | |
| 453 | mlog_entry("(block = %llu)\n", (unsigned long long)block); |
| 454 | |
| 455 | /* We don't need to lock journal system files, since they aren't |
| 456 | * accessed concurrently from multiple nodes. |
| 457 | */ |
| 458 | if (!INODE_JOURNAL(inode)) { |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 459 | err = ocfs2_inode_lock(inode, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 460 | if (err) { |
| 461 | if (err != -ENOENT) |
| 462 | mlog_errno(err); |
| 463 | goto bail; |
| 464 | } |
| 465 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 466 | } |
| 467 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 468 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 469 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, |
| 470 | NULL); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 471 | |
| 472 | if (!INODE_JOURNAL(inode)) { |
| 473 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 474 | ocfs2_inode_unlock(inode, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | if (err) { |
| 478 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", |
| 479 | (unsigned long long)block); |
| 480 | mlog_errno(err); |
| 481 | goto bail; |
| 482 | } |
| 483 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 484 | bail: |
| 485 | status = err ? 0 : p_blkno; |
| 486 | |
| 487 | mlog_exit((int)status); |
| 488 | |
| 489 | return status; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * TODO: Make this into a generic get_blocks function. |
| 494 | * |
| 495 | * From do_direct_io in direct-io.c: |
| 496 | * "So what we do is to permit the ->get_blocks function to populate |
| 497 | * bh.b_size with the size of IO which is permitted at this offset and |
| 498 | * this i_blkbits." |
| 499 | * |
| 500 | * This function is called directly from get_more_blocks in direct-io.c. |
| 501 | * |
| 502 | * called like this: dio->get_blocks(dio->inode, fs_startblk, |
| 503 | * fs_count, map_bh, dio->rw == WRITE); |
Christoph Hellwig | 5fe878a | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 504 | * |
| 505 | * Note that we never bother to allocate blocks here, and thus ignore the |
| 506 | * create argument. |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 507 | */ |
| 508 | 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] | 509 | struct buffer_head *bh_result, int create) |
| 510 | { |
| 511 | int ret; |
Mark Fasheh | 4f902c3 | 2007-03-09 16:26:50 -0800 | [diff] [blame] | 512 | u64 p_blkno, inode_blocks, contig_blocks; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 513 | unsigned int ext_flags; |
Florin Malita | 184d7d2 | 2006-06-03 19:30:10 -0400 | [diff] [blame] | 514 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 515 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 516 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 517 | /* This function won't even be called if the request isn't all |
| 518 | * nicely aligned and of the right size, so there's no need |
| 519 | * for us to check any of that. */ |
| 520 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 521 | 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] | 522 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 523 | /* This figures out the size of the next contiguous block, and |
| 524 | * our logical offset */ |
Mark Fasheh | 363041a | 2007-01-17 12:31:35 -0800 | [diff] [blame] | 525 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 526 | &contig_blocks, &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 527 | if (ret) { |
| 528 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", |
| 529 | (unsigned long long)iblock); |
| 530 | ret = -EIO; |
| 531 | goto bail; |
| 532 | } |
| 533 | |
Tao Ma | cbaee47 | 2010-02-26 10:54:52 +0800 | [diff] [blame] | 534 | /* We should already CoW the refcounted extent in case of create. */ |
| 535 | BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED)); |
| 536 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 537 | /* |
| 538 | * get_more_blocks() expects us to describe a hole by clearing |
| 539 | * the mapped bit on bh_result(). |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 540 | * |
| 541 | * Consider an unwritten extent as a hole. |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 542 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 543 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 544 | map_bh(bh_result, inode->i_sb, p_blkno); |
Christoph Hellwig | 5fe878a | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 545 | else |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 546 | clear_buffer_mapped(bh_result); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 547 | |
| 548 | /* make sure we don't map more than max_blocks blocks here as |
| 549 | that's all the kernel will handle at this point. */ |
| 550 | if (max_blocks < contig_blocks) |
| 551 | contig_blocks = max_blocks; |
| 552 | bh_result->b_size = contig_blocks << blocksize_bits; |
| 553 | bail: |
| 554 | return ret; |
| 555 | } |
| 556 | |
Sunil Mushran | 2bd6321 | 2010-01-25 16:57:38 -0800 | [diff] [blame] | 557 | /* |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 558 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
| 559 | * particularly interested in the aio/dio case. Like the core uses |
| 560 | * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from |
| 561 | * truncation on another. |
| 562 | */ |
| 563 | static void ocfs2_dio_end_io(struct kiocb *iocb, |
| 564 | loff_t offset, |
| 565 | ssize_t bytes, |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 566 | void *private, |
| 567 | int ret, |
| 568 | bool is_async) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 569 | { |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 570 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 571 | int level; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 572 | |
| 573 | /* this io's submitter should not have unlocked this before we could */ |
| 574 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 575 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 576 | ocfs2_iocb_clear_rw_locked(iocb); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 577 | |
| 578 | level = ocfs2_iocb_rw_locked_level(iocb); |
| 579 | if (!level) |
| 580 | up_read(&inode->i_alloc_sem); |
| 581 | ocfs2_rw_unlock(inode, level); |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 582 | |
| 583 | if (is_async) |
| 584 | aio_complete(iocb, ret, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 585 | } |
| 586 | |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 587 | /* |
| 588 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen |
| 589 | * from ext3. PageChecked() bits have been removed as OCFS2 does not |
| 590 | * do journalled data. |
| 591 | */ |
| 592 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) |
| 593 | { |
| 594 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 595 | |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 596 | jbd2_journal_invalidatepage(journal, page, offset); |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
| 600 | { |
| 601 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 602 | |
| 603 | if (!page_has_buffers(page)) |
| 604 | return 0; |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 605 | return jbd2_journal_try_to_free_buffers(journal, page, wait); |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 606 | } |
| 607 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 608 | static ssize_t ocfs2_direct_IO(int rw, |
| 609 | struct kiocb *iocb, |
| 610 | const struct iovec *iov, |
| 611 | loff_t offset, |
| 612 | unsigned long nr_segs) |
| 613 | { |
| 614 | struct file *file = iocb->ki_filp; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 615 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 616 | int ret; |
| 617 | |
| 618 | mlog_entry_void(); |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 619 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 620 | /* |
| 621 | * Fallback to buffered I/O if we see an inode without |
| 622 | * extents. |
| 623 | */ |
| 624 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 625 | return 0; |
| 626 | |
Tao Ma | b80474b | 2009-09-10 15:28:47 +0800 | [diff] [blame] | 627 | /* Fallback to buffered I/O if we are appending. */ |
| 628 | if (i_size_read(inode) <= offset) |
| 629 | return 0; |
| 630 | |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 631 | ret = __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, |
| 632 | iov, offset, nr_segs, |
| 633 | ocfs2_direct_IO_get_blocks, |
| 634 | ocfs2_dio_end_io, NULL, 0); |
Mark Fasheh | c934a92 | 2007-10-18 15:23:46 -0700 | [diff] [blame] | 635 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 636 | mlog_exit(ret); |
| 637 | return ret; |
| 638 | } |
| 639 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 640 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
| 641 | u32 cpos, |
| 642 | unsigned int *start, |
| 643 | unsigned int *end) |
| 644 | { |
| 645 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; |
| 646 | |
| 647 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { |
| 648 | unsigned int cpp; |
| 649 | |
| 650 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); |
| 651 | |
| 652 | cluster_start = cpos % cpp; |
| 653 | cluster_start = cluster_start << osb->s_clustersize_bits; |
| 654 | |
| 655 | cluster_end = cluster_start + osb->s_clustersize; |
| 656 | } |
| 657 | |
| 658 | BUG_ON(cluster_start > PAGE_SIZE); |
| 659 | BUG_ON(cluster_end > PAGE_SIZE); |
| 660 | |
| 661 | if (start) |
| 662 | *start = cluster_start; |
| 663 | if (end) |
| 664 | *end = cluster_end; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * 'from' and 'to' are the region in the page to avoid zeroing. |
| 669 | * |
| 670 | * If pagesize > clustersize, this function will avoid zeroing outside |
| 671 | * of the cluster boundary. |
| 672 | * |
| 673 | * from == to == 0 is code for "zero the entire cluster region" |
| 674 | */ |
| 675 | static void ocfs2_clear_page_regions(struct page *page, |
| 676 | struct ocfs2_super *osb, u32 cpos, |
| 677 | unsigned from, unsigned to) |
| 678 | { |
| 679 | void *kaddr; |
| 680 | unsigned int cluster_start, cluster_end; |
| 681 | |
| 682 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); |
| 683 | |
| 684 | kaddr = kmap_atomic(page, KM_USER0); |
| 685 | |
| 686 | if (from || to) { |
| 687 | if (from > cluster_start) |
| 688 | memset(kaddr + cluster_start, 0, from - cluster_start); |
| 689 | if (to < cluster_end) |
| 690 | memset(kaddr + to, 0, cluster_end - to); |
| 691 | } else { |
| 692 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); |
| 693 | } |
| 694 | |
| 695 | kunmap_atomic(kaddr, KM_USER0); |
| 696 | } |
| 697 | |
| 698 | /* |
Mark Fasheh | 4e9563f | 2007-11-01 11:37:48 -0700 | [diff] [blame] | 699 | * Nonsparse file systems fully allocate before we get to the write |
| 700 | * code. This prevents ocfs2_write() from tagging the write as an |
| 701 | * allocating one, which means ocfs2_map_page_blocks() might try to |
| 702 | * read-in the blocks at the tail of our file. Avoid reading them by |
| 703 | * testing i_size against each block offset. |
| 704 | */ |
| 705 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, |
| 706 | unsigned int block_start) |
| 707 | { |
| 708 | u64 offset = page_offset(page) + block_start; |
| 709 | |
| 710 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| 711 | return 1; |
| 712 | |
| 713 | if (i_size_read(inode) > offset) |
| 714 | return 1; |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | /* |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 720 | * Some of this taken from __block_write_begin(). We already have our |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 721 | * mapping by now though, and the entire write will be allocating or |
| 722 | * it won't, so not much need to use BH_New. |
| 723 | * |
| 724 | * This will also skip zeroing, which is handled externally. |
| 725 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 726 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
| 727 | struct inode *inode, unsigned int from, |
| 728 | unsigned int to, int new) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 729 | { |
| 730 | int ret = 0; |
| 731 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; |
| 732 | unsigned int block_end, block_start; |
| 733 | unsigned int bsize = 1 << inode->i_blkbits; |
| 734 | |
| 735 | if (!page_has_buffers(page)) |
| 736 | create_empty_buffers(page, bsize, 0); |
| 737 | |
| 738 | head = page_buffers(page); |
| 739 | for (bh = head, block_start = 0; bh != head || !block_start; |
| 740 | bh = bh->b_this_page, block_start += bsize) { |
| 741 | block_end = block_start + bsize; |
| 742 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 743 | clear_buffer_new(bh); |
| 744 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 745 | /* |
| 746 | * Ignore blocks outside of our i/o range - |
| 747 | * they may belong to unallocated clusters. |
| 748 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 749 | if (block_start >= to || block_end <= from) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 750 | if (PageUptodate(page)) |
| 751 | set_buffer_uptodate(bh); |
| 752 | continue; |
| 753 | } |
| 754 | |
| 755 | /* |
| 756 | * For an allocating write with cluster size >= page |
| 757 | * size, we always write the entire page. |
| 758 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 759 | if (new) |
| 760 | set_buffer_new(bh); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 761 | |
| 762 | if (!buffer_mapped(bh)) { |
| 763 | map_bh(bh, inode->i_sb, *p_blkno); |
| 764 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 765 | } |
| 766 | |
| 767 | if (PageUptodate(page)) { |
| 768 | if (!buffer_uptodate(bh)) |
| 769 | set_buffer_uptodate(bh); |
| 770 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 771 | !buffer_new(bh) && |
Mark Fasheh | 4e9563f | 2007-11-01 11:37:48 -0700 | [diff] [blame] | 772 | ocfs2_should_read_blk(inode, page, block_start) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 773 | (block_start < from || block_end > to)) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 774 | ll_rw_block(READ, 1, &bh); |
| 775 | *wait_bh++=bh; |
| 776 | } |
| 777 | |
| 778 | *p_blkno = *p_blkno + 1; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * If we issued read requests - let them complete. |
| 783 | */ |
| 784 | while(wait_bh > wait) { |
| 785 | wait_on_buffer(*--wait_bh); |
| 786 | if (!buffer_uptodate(*wait_bh)) |
| 787 | ret = -EIO; |
| 788 | } |
| 789 | |
| 790 | if (ret == 0 || !new) |
| 791 | return ret; |
| 792 | |
| 793 | /* |
| 794 | * If we get -EIO above, zero out any newly allocated blocks |
| 795 | * to avoid exposing stale data. |
| 796 | */ |
| 797 | bh = head; |
| 798 | block_start = 0; |
| 799 | do { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 800 | block_end = block_start + bsize; |
| 801 | if (block_end <= from) |
| 802 | goto next_bh; |
| 803 | if (block_start >= to) |
| 804 | break; |
| 805 | |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 806 | zero_user(page, block_start, bh->b_size); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 807 | set_buffer_uptodate(bh); |
| 808 | mark_buffer_dirty(bh); |
| 809 | |
| 810 | next_bh: |
| 811 | block_start = block_end; |
| 812 | bh = bh->b_this_page; |
| 813 | } while (bh != head); |
| 814 | |
| 815 | return ret; |
| 816 | } |
| 817 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 818 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
| 819 | #define OCFS2_MAX_CTXT_PAGES 1 |
| 820 | #else |
| 821 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) |
| 822 | #endif |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 823 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 824 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 825 | |
| 826 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 827 | * Describe the state of a single cluster to be written to. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 828 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 829 | struct ocfs2_write_cluster_desc { |
| 830 | u32 c_cpos; |
| 831 | u32 c_phys; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 832 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 833 | * Give this a unique field because c_phys eventually gets |
| 834 | * filled. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 835 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 836 | unsigned c_new; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 837 | unsigned c_unwritten; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 838 | unsigned c_needs_zero; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 839 | }; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 840 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 841 | struct ocfs2_write_ctxt { |
| 842 | /* Logical cluster position / len of write */ |
| 843 | u32 w_cpos; |
| 844 | u32 w_clen; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 845 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 846 | /* First cluster allocated in a nonsparse extend */ |
| 847 | u32 w_first_new_cpos; |
| 848 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 849 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 850 | |
| 851 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 852 | * This is true if page_size > cluster_size. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 853 | * |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 854 | * It triggers a set of special cases during write which might |
| 855 | * have to deal with allocating writes to partial pages. |
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 | unsigned int w_large_pages; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 858 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 859 | /* |
| 860 | * Pages involved in this write. |
| 861 | * |
| 862 | * w_target_page is the page being written to by the user. |
| 863 | * |
| 864 | * w_pages is an array of pages which always contains |
| 865 | * w_target_page, and in the case of an allocating write with |
| 866 | * page_size < cluster size, it will contain zero'd and mapped |
| 867 | * pages adjacent to w_target_page which need to be written |
| 868 | * out in so that future reads from that region will get |
| 869 | * zero's. |
| 870 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 871 | unsigned int w_num_pages; |
Goldwyn Rodrigues | 83fd9c7 | 2010-06-10 17:21:36 -0500 | [diff] [blame] | 872 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 873 | struct page *w_target_page; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 874 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 875 | /* |
| 876 | * ocfs2_write_end() uses this to know what the real range to |
| 877 | * write in the target should be. |
| 878 | */ |
| 879 | unsigned int w_target_from; |
| 880 | unsigned int w_target_to; |
| 881 | |
| 882 | /* |
| 883 | * We could use journal_current_handle() but this is cleaner, |
| 884 | * IMHO -Mark |
| 885 | */ |
| 886 | handle_t *w_handle; |
| 887 | |
| 888 | struct buffer_head *w_di_bh; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 889 | |
| 890 | struct ocfs2_cached_dealloc_ctxt w_dealloc; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 891 | }; |
| 892 | |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 893 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 894 | { |
| 895 | int i; |
| 896 | |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 897 | for(i = 0; i < num_pages; i++) { |
| 898 | if (pages[i]) { |
| 899 | unlock_page(pages[i]); |
| 900 | mark_page_accessed(pages[i]); |
| 901 | page_cache_release(pages[i]); |
| 902 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 903 | } |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 904 | } |
| 905 | |
| 906 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) |
| 907 | { |
| 908 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 909 | |
| 910 | brelse(wc->w_di_bh); |
| 911 | kfree(wc); |
| 912 | } |
| 913 | |
| 914 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, |
| 915 | struct ocfs2_super *osb, loff_t pos, |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 916 | unsigned len, struct buffer_head *di_bh) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 917 | { |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 918 | u32 cend; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 919 | struct ocfs2_write_ctxt *wc; |
| 920 | |
| 921 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); |
| 922 | if (!wc) |
| 923 | return -ENOMEM; |
| 924 | |
| 925 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 926 | wc->w_first_new_cpos = UINT_MAX; |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 927 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
| 928 | wc->w_clen = cend - wc->w_cpos + 1; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 929 | get_bh(di_bh); |
| 930 | wc->w_di_bh = di_bh; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 931 | |
| 932 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
| 933 | wc->w_large_pages = 1; |
| 934 | else |
| 935 | wc->w_large_pages = 0; |
| 936 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 937 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
| 938 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 939 | *wcp = wc; |
| 940 | |
| 941 | return 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 942 | } |
| 943 | |
| 944 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 945 | * If a page has any new buffers, zero them out here, and mark them uptodate |
| 946 | * and dirty so they'll be written out (in order to prevent uninitialised |
| 947 | * block data from leaking). And clear the new bit. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 948 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 949 | 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] | 950 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 951 | unsigned int block_start, block_end; |
| 952 | struct buffer_head *head, *bh; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 953 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 954 | BUG_ON(!PageLocked(page)); |
| 955 | if (!page_has_buffers(page)) |
| 956 | return; |
| 957 | |
| 958 | bh = head = page_buffers(page); |
| 959 | block_start = 0; |
| 960 | do { |
| 961 | block_end = block_start + bh->b_size; |
| 962 | |
| 963 | if (buffer_new(bh)) { |
| 964 | if (block_end > from && block_start < to) { |
| 965 | if (!PageUptodate(page)) { |
| 966 | unsigned start, end; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 967 | |
| 968 | start = max(from, block_start); |
| 969 | end = min(to, block_end); |
| 970 | |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 971 | zero_user_segment(page, start, end); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 972 | set_buffer_uptodate(bh); |
| 973 | } |
| 974 | |
| 975 | clear_buffer_new(bh); |
| 976 | mark_buffer_dirty(bh); |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | block_start = block_end; |
| 981 | bh = bh->b_this_page; |
| 982 | } while (bh != head); |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * Only called when we have a failure during allocating write to write |
| 987 | * zero's to the newly allocated region. |
| 988 | */ |
| 989 | static void ocfs2_write_failure(struct inode *inode, |
| 990 | struct ocfs2_write_ctxt *wc, |
| 991 | loff_t user_pos, unsigned user_len) |
| 992 | { |
| 993 | int i; |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame] | 994 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
| 995 | to = user_pos + user_len; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 996 | struct page *tmppage; |
| 997 | |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame] | 998 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 999 | |
| 1000 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1001 | tmppage = wc->w_pages[i]; |
| 1002 | |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 1003 | if (page_has_buffers(tmppage)) { |
Mark Fasheh | 53ef99c | 2008-11-18 16:53:43 -0800 | [diff] [blame] | 1004 | if (ocfs2_should_order_data(inode)) |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 1005 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1006 | |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 1007 | block_commit_write(tmppage, from, to); |
| 1008 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
| 1013 | struct ocfs2_write_ctxt *wc, |
| 1014 | struct page *page, u32 cpos, |
| 1015 | loff_t user_pos, unsigned user_len, |
| 1016 | int new) |
| 1017 | { |
| 1018 | int ret; |
| 1019 | unsigned int map_from = 0, map_to = 0; |
| 1020 | unsigned int cluster_start, cluster_end; |
| 1021 | unsigned int user_data_from = 0, user_data_to = 0; |
| 1022 | |
| 1023 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1024 | &cluster_start, &cluster_end); |
| 1025 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1026 | if (page == wc->w_target_page) { |
| 1027 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); |
| 1028 | map_to = map_from + user_len; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1029 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1030 | if (new) |
| 1031 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 1032 | cluster_start, cluster_end, |
| 1033 | new); |
| 1034 | else |
| 1035 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 1036 | map_from, map_to, new); |
| 1037 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1038 | mlog_errno(ret); |
| 1039 | goto out; |
| 1040 | } |
| 1041 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1042 | user_data_from = map_from; |
| 1043 | user_data_to = map_to; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1044 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1045 | map_from = cluster_start; |
| 1046 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1047 | } |
| 1048 | } else { |
| 1049 | /* |
| 1050 | * If we haven't allocated the new page yet, we |
| 1051 | * shouldn't be writing it out without copying user |
| 1052 | * data. This is likely a math error from the caller. |
| 1053 | */ |
| 1054 | BUG_ON(!new); |
| 1055 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1056 | map_from = cluster_start; |
| 1057 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1058 | |
| 1059 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1060 | cluster_start, cluster_end, new); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1061 | if (ret) { |
| 1062 | mlog_errno(ret); |
| 1063 | goto out; |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * Parts of newly allocated pages need to be zero'd. |
| 1069 | * |
| 1070 | * Above, we have also rewritten 'to' and 'from' - as far as |
| 1071 | * the rest of the function is concerned, the entire cluster |
| 1072 | * range inside of a page needs to be written. |
| 1073 | * |
| 1074 | * We can skip this if the page is up to date - it's already |
| 1075 | * been zero'd from being read in as a hole. |
| 1076 | */ |
| 1077 | if (new && !PageUptodate(page)) |
| 1078 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1079 | cpos, user_data_from, user_data_to); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1080 | |
| 1081 | flush_dcache_page(page); |
| 1082 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1083 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1084 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1085 | } |
| 1086 | |
| 1087 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1088 | * This function will only grab one clusters worth of pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1089 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1090 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
| 1091 | struct ocfs2_write_ctxt *wc, |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1092 | u32 cpos, loff_t user_pos, |
| 1093 | unsigned user_len, int new, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1094 | struct page *mmap_page) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1095 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1096 | int ret = 0, i; |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1097 | unsigned long start, target_index, end_index, index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1098 | struct inode *inode = mapping->host; |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1099 | loff_t last_byte; |
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 |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1106 | * page. Otherwise, we'll need a whole clusters worth. If we're |
| 1107 | * writing past i_size, we only need enough pages to cover the |
| 1108 | * last page of the write. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1109 | */ |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1110 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1111 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
| 1112 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1113 | /* |
| 1114 | * We need the index *past* the last page we could possibly |
| 1115 | * touch. This is the page past the end of the write or |
| 1116 | * i_size, whichever is greater. |
| 1117 | */ |
| 1118 | last_byte = max(user_pos + user_len, i_size_read(inode)); |
| 1119 | BUG_ON(last_byte < 1); |
| 1120 | end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1; |
| 1121 | if ((start + wc->w_num_pages) > end_index) |
| 1122 | wc->w_num_pages = end_index - start; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1123 | } else { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1124 | wc->w_num_pages = 1; |
| 1125 | start = target_index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1126 | } |
| 1127 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1128 | for(i = 0; i < wc->w_num_pages; i++) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1129 | index = start + i; |
| 1130 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1131 | if (index == target_index && mmap_page) { |
| 1132 | /* |
| 1133 | * ocfs2_pagemkwrite() is a little different |
| 1134 | * and wants us to directly use the page |
| 1135 | * passed in. |
| 1136 | */ |
| 1137 | lock_page(mmap_page); |
| 1138 | |
| 1139 | if (mmap_page->mapping != mapping) { |
| 1140 | unlock_page(mmap_page); |
| 1141 | /* |
| 1142 | * Sanity check - the locking in |
| 1143 | * ocfs2_pagemkwrite() should ensure |
| 1144 | * that this code doesn't trigger. |
| 1145 | */ |
| 1146 | ret = -EINVAL; |
| 1147 | mlog_errno(ret); |
| 1148 | goto out; |
| 1149 | } |
| 1150 | |
| 1151 | page_cache_get(mmap_page); |
| 1152 | wc->w_pages[i] = mmap_page; |
| 1153 | } else { |
| 1154 | wc->w_pages[i] = find_or_create_page(mapping, index, |
| 1155 | GFP_NOFS); |
| 1156 | if (!wc->w_pages[i]) { |
| 1157 | ret = -ENOMEM; |
| 1158 | mlog_errno(ret); |
| 1159 | goto out; |
| 1160 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1161 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1162 | |
| 1163 | if (index == target_index) |
| 1164 | wc->w_target_page = wc->w_pages[i]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1165 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1166 | out: |
| 1167 | return ret; |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * Prepare a single cluster for write one cluster into the file. |
| 1172 | */ |
| 1173 | static int ocfs2_write_cluster(struct address_space *mapping, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1174 | u32 phys, unsigned int unwritten, |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1175 | unsigned int should_zero, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1176 | struct ocfs2_alloc_context *data_ac, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1177 | struct ocfs2_alloc_context *meta_ac, |
| 1178 | struct ocfs2_write_ctxt *wc, u32 cpos, |
| 1179 | loff_t user_pos, unsigned user_len) |
| 1180 | { |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1181 | int ret, i, new; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1182 | u64 v_blkno, p_blkno; |
| 1183 | struct inode *inode = mapping->host; |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1184 | struct ocfs2_extent_tree et; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1185 | |
| 1186 | new = phys == 0 ? 1 : 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1187 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1188 | u32 tmp_pos; |
| 1189 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1190 | /* |
| 1191 | * This is safe to call with the page locks - it won't take |
| 1192 | * any additional semaphores or cluster locks. |
| 1193 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1194 | tmp_pos = cpos; |
Tao Ma | 0eb8d47 | 2008-08-18 17:38:45 +0800 | [diff] [blame] | 1195 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
| 1196 | &tmp_pos, 1, 0, wc->w_di_bh, |
| 1197 | wc->w_handle, data_ac, |
| 1198 | meta_ac, NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1199 | /* |
| 1200 | * This shouldn't happen because we must have already |
| 1201 | * calculated the correct meta data allocation required. The |
| 1202 | * internal tree allocation code should know how to increase |
| 1203 | * transaction credits itself. |
| 1204 | * |
| 1205 | * If need be, we could handle -EAGAIN for a |
| 1206 | * RESTART_TRANS here. |
| 1207 | */ |
| 1208 | mlog_bug_on_msg(ret == -EAGAIN, |
| 1209 | "Inode %llu: EAGAIN return during allocation.\n", |
| 1210 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 1211 | if (ret < 0) { |
| 1212 | mlog_errno(ret); |
| 1213 | goto out; |
| 1214 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1215 | } else if (unwritten) { |
Joel Becker | 5e404e9 | 2009-02-13 03:54:22 -0800 | [diff] [blame] | 1216 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
| 1217 | wc->w_di_bh); |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1218 | ret = ocfs2_mark_extent_written(inode, &et, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1219 | wc->w_handle, cpos, 1, phys, |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1220 | meta_ac, &wc->w_dealloc); |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1221 | if (ret < 0) { |
| 1222 | mlog_errno(ret); |
| 1223 | goto out; |
| 1224 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1225 | } |
| 1226 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1227 | if (should_zero) |
| 1228 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
| 1229 | else |
| 1230 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
| 1231 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1232 | /* |
| 1233 | * The only reason this should fail is due to an inability to |
| 1234 | * find the extent added. |
| 1235 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 1236 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
| 1237 | NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1238 | if (ret < 0) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1239 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
| 1240 | "at logical block %llu", |
| 1241 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1242 | (unsigned long long)v_blkno); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1243 | goto out; |
| 1244 | } |
| 1245 | |
| 1246 | BUG_ON(p_blkno == 0); |
| 1247 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1248 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1249 | int tmpret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1250 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1251 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
| 1252 | wc->w_pages[i], cpos, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1253 | user_pos, user_len, |
| 1254 | should_zero); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1255 | if (tmpret) { |
| 1256 | mlog_errno(tmpret); |
| 1257 | if (ret == 0) |
Wengang Wang | cbfa963 | 2009-07-13 11:38:23 +0800 | [diff] [blame] | 1258 | ret = tmpret; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1259 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1260 | } |
| 1261 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1262 | /* |
| 1263 | * We only have cleanup to do in case of allocating write. |
| 1264 | */ |
| 1265 | if (ret && new) |
| 1266 | ocfs2_write_failure(inode, wc, user_pos, user_len); |
| 1267 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1268 | out: |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1269 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1270 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1271 | } |
| 1272 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1273 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
| 1274 | struct ocfs2_alloc_context *data_ac, |
| 1275 | struct ocfs2_alloc_context *meta_ac, |
| 1276 | struct ocfs2_write_ctxt *wc, |
| 1277 | loff_t pos, unsigned len) |
| 1278 | { |
| 1279 | int ret, i; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1280 | loff_t cluster_off; |
| 1281 | unsigned int local_len = len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1282 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1283 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1284 | |
| 1285 | for (i = 0; i < wc->w_clen; i++) { |
| 1286 | desc = &wc->w_desc[i]; |
| 1287 | |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1288 | /* |
| 1289 | * We have to make sure that the total write passed in |
| 1290 | * doesn't extend past a single cluster. |
| 1291 | */ |
| 1292 | local_len = len; |
| 1293 | cluster_off = pos & (osb->s_clustersize - 1); |
| 1294 | if ((cluster_off + local_len) > osb->s_clustersize) |
| 1295 | local_len = osb->s_clustersize - cluster_off; |
| 1296 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1297 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1298 | desc->c_unwritten, |
| 1299 | desc->c_needs_zero, |
| 1300 | data_ac, meta_ac, |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1301 | wc, desc->c_cpos, pos, local_len); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1302 | if (ret) { |
| 1303 | mlog_errno(ret); |
| 1304 | goto out; |
| 1305 | } |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1306 | |
| 1307 | len -= local_len; |
| 1308 | pos += local_len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1309 | } |
| 1310 | |
| 1311 | ret = 0; |
| 1312 | out: |
| 1313 | return ret; |
| 1314 | } |
| 1315 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1316 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1317 | * ocfs2_write_end() wants to know which parts of the target page it |
| 1318 | * should complete the write on. It's easiest to compute them ahead of |
| 1319 | * time when a more complete view of the write is available. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1320 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1321 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, |
| 1322 | struct ocfs2_write_ctxt *wc, |
| 1323 | loff_t pos, unsigned len, int alloc) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1324 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1325 | struct ocfs2_write_cluster_desc *desc; |
| 1326 | |
| 1327 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
| 1328 | wc->w_target_to = wc->w_target_from + len; |
| 1329 | |
| 1330 | if (alloc == 0) |
| 1331 | return; |
| 1332 | |
| 1333 | /* |
| 1334 | * Allocating write - we may have different boundaries based |
| 1335 | * on page size and cluster size. |
| 1336 | * |
| 1337 | * NOTE: We can no longer compute one value from the other as |
| 1338 | * the actual write length and user provided length may be |
| 1339 | * different. |
| 1340 | */ |
| 1341 | |
| 1342 | if (wc->w_large_pages) { |
| 1343 | /* |
| 1344 | * We only care about the 1st and last cluster within |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1345 | * our range and whether they should be zero'd or not. Either |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1346 | * value may be extended out to the start/end of a |
| 1347 | * newly allocated cluster. |
| 1348 | */ |
| 1349 | desc = &wc->w_desc[0]; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1350 | if (desc->c_needs_zero) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1351 | ocfs2_figure_cluster_boundaries(osb, |
| 1352 | desc->c_cpos, |
| 1353 | &wc->w_target_from, |
| 1354 | NULL); |
| 1355 | |
| 1356 | desc = &wc->w_desc[wc->w_clen - 1]; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1357 | if (desc->c_needs_zero) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1358 | ocfs2_figure_cluster_boundaries(osb, |
| 1359 | desc->c_cpos, |
| 1360 | NULL, |
| 1361 | &wc->w_target_to); |
| 1362 | } else { |
| 1363 | wc->w_target_from = 0; |
| 1364 | wc->w_target_to = PAGE_CACHE_SIZE; |
| 1365 | } |
| 1366 | } |
| 1367 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1368 | /* |
| 1369 | * Populate each single-cluster write descriptor in the write context |
| 1370 | * with information about the i/o to be done. |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1371 | * |
| 1372 | * Returns the number of clusters that will have to be allocated, as |
| 1373 | * well as a worst case estimate of the number of extent records that |
| 1374 | * would have to be created during a write to an unwritten region. |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1375 | */ |
| 1376 | static int ocfs2_populate_write_desc(struct inode *inode, |
| 1377 | struct ocfs2_write_ctxt *wc, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1378 | unsigned int *clusters_to_alloc, |
| 1379 | unsigned int *extents_to_split) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1380 | { |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1381 | int ret; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1382 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1383 | unsigned int num_clusters = 0; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1384 | unsigned int ext_flags = 0; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1385 | u32 phys = 0; |
| 1386 | int i; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1387 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1388 | *clusters_to_alloc = 0; |
| 1389 | *extents_to_split = 0; |
| 1390 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1391 | for (i = 0; i < wc->w_clen; i++) { |
| 1392 | desc = &wc->w_desc[i]; |
| 1393 | desc->c_cpos = wc->w_cpos + i; |
| 1394 | |
| 1395 | if (num_clusters == 0) { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1396 | /* |
| 1397 | * Need to look up the next extent record. |
| 1398 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1399 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1400 | &num_clusters, &ext_flags); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1401 | if (ret) { |
| 1402 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1403 | goto out; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1404 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1405 | |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 1406 | /* We should already CoW the refcountd extent. */ |
| 1407 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); |
| 1408 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1409 | /* |
| 1410 | * Assume worst case - that we're writing in |
| 1411 | * the middle of the extent. |
| 1412 | * |
| 1413 | * We can assume that the write proceeds from |
| 1414 | * left to right, in which case the extent |
| 1415 | * insert code is smart enough to coalesce the |
| 1416 | * next splits into the previous records created. |
| 1417 | */ |
| 1418 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1419 | *extents_to_split = *extents_to_split + 2; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1420 | } else if (phys) { |
| 1421 | /* |
| 1422 | * Only increment phys if it doesn't describe |
| 1423 | * a hole. |
| 1424 | */ |
| 1425 | phys++; |
| 1426 | } |
| 1427 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1428 | /* |
| 1429 | * If w_first_new_cpos is < UINT_MAX, we have a non-sparse |
| 1430 | * file that got extended. w_first_new_cpos tells us |
| 1431 | * where the newly allocated clusters are so we can |
| 1432 | * zero them. |
| 1433 | */ |
| 1434 | if (desc->c_cpos >= wc->w_first_new_cpos) { |
| 1435 | BUG_ON(phys == 0); |
| 1436 | desc->c_needs_zero = 1; |
| 1437 | } |
| 1438 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1439 | desc->c_phys = phys; |
| 1440 | if (phys == 0) { |
| 1441 | desc->c_new = 1; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1442 | desc->c_needs_zero = 1; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1443 | *clusters_to_alloc = *clusters_to_alloc + 1; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1444 | } |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1445 | |
| 1446 | if (ext_flags & OCFS2_EXT_UNWRITTEN) { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1447 | desc->c_unwritten = 1; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1448 | desc->c_needs_zero = 1; |
| 1449 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1450 | |
| 1451 | num_clusters--; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1452 | } |
| 1453 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1454 | ret = 0; |
| 1455 | out: |
| 1456 | return ret; |
| 1457 | } |
| 1458 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1459 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
| 1460 | struct inode *inode, |
| 1461 | struct ocfs2_write_ctxt *wc) |
| 1462 | { |
| 1463 | int ret; |
| 1464 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1465 | struct page *page; |
| 1466 | handle_t *handle; |
| 1467 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1468 | |
| 1469 | page = find_or_create_page(mapping, 0, GFP_NOFS); |
| 1470 | if (!page) { |
| 1471 | ret = -ENOMEM; |
| 1472 | mlog_errno(ret); |
| 1473 | goto out; |
| 1474 | } |
| 1475 | /* |
| 1476 | * If we don't set w_num_pages then this page won't get unlocked |
| 1477 | * and freed on cleanup of the write context. |
| 1478 | */ |
| 1479 | wc->w_pages[0] = wc->w_target_page = page; |
| 1480 | wc->w_num_pages = 1; |
| 1481 | |
| 1482 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| 1483 | if (IS_ERR(handle)) { |
| 1484 | ret = PTR_ERR(handle); |
| 1485 | mlog_errno(ret); |
| 1486 | goto out; |
| 1487 | } |
| 1488 | |
Joel Becker | 0cf2f76 | 2009-02-12 16:41:25 -0800 | [diff] [blame] | 1489 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
Joel Becker | 13723d0 | 2008-10-17 19:25:01 -0700 | [diff] [blame] | 1490 | OCFS2_JOURNAL_ACCESS_WRITE); |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1491 | if (ret) { |
| 1492 | ocfs2_commit_trans(osb, handle); |
| 1493 | |
| 1494 | mlog_errno(ret); |
| 1495 | goto out; |
| 1496 | } |
| 1497 | |
| 1498 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 1499 | ocfs2_set_inode_data_inline(inode, di); |
| 1500 | |
| 1501 | if (!PageUptodate(page)) { |
| 1502 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); |
| 1503 | if (ret) { |
| 1504 | ocfs2_commit_trans(osb, handle); |
| 1505 | |
| 1506 | goto out; |
| 1507 | } |
| 1508 | } |
| 1509 | |
| 1510 | wc->w_handle = handle; |
| 1511 | out: |
| 1512 | return ret; |
| 1513 | } |
| 1514 | |
| 1515 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) |
| 1516 | { |
| 1517 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 1518 | |
Mark Fasheh | 0d8a4e0 | 2007-11-20 11:48:41 -0800 | [diff] [blame] | 1519 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1520 | return 1; |
| 1521 | return 0; |
| 1522 | } |
| 1523 | |
| 1524 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, |
| 1525 | struct inode *inode, loff_t pos, |
| 1526 | unsigned len, struct page *mmap_page, |
| 1527 | struct ocfs2_write_ctxt *wc) |
| 1528 | { |
| 1529 | int ret, written = 0; |
| 1530 | loff_t end = pos + len; |
| 1531 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
Tiger Yang | d9ae49d | 2009-03-05 11:06:15 +0800 | [diff] [blame] | 1532 | struct ocfs2_dinode *di = NULL; |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1533 | |
| 1534 | mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n", |
| 1535 | (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, |
| 1536 | oi->ip_dyn_features); |
| 1537 | |
| 1538 | /* |
| 1539 | * Handle inodes which already have inline data 1st. |
| 1540 | */ |
| 1541 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1542 | if (mmap_page == NULL && |
| 1543 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) |
| 1544 | goto do_inline_write; |
| 1545 | |
| 1546 | /* |
| 1547 | * The write won't fit - we have to give this inode an |
| 1548 | * inline extent list now. |
| 1549 | */ |
| 1550 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); |
| 1551 | if (ret) |
| 1552 | mlog_errno(ret); |
| 1553 | goto out; |
| 1554 | } |
| 1555 | |
| 1556 | /* |
| 1557 | * Check whether the inode can accept inline data. |
| 1558 | */ |
| 1559 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) |
| 1560 | return 0; |
| 1561 | |
| 1562 | /* |
| 1563 | * Check whether the write can fit. |
| 1564 | */ |
Tiger Yang | d9ae49d | 2009-03-05 11:06:15 +0800 | [diff] [blame] | 1565 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1566 | if (mmap_page || |
| 1567 | end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1568 | return 0; |
| 1569 | |
| 1570 | do_inline_write: |
| 1571 | ret = ocfs2_write_begin_inline(mapping, inode, wc); |
| 1572 | if (ret) { |
| 1573 | mlog_errno(ret); |
| 1574 | goto out; |
| 1575 | } |
| 1576 | |
| 1577 | /* |
| 1578 | * This signals to the caller that the data can be written |
| 1579 | * inline. |
| 1580 | */ |
| 1581 | written = 1; |
| 1582 | out: |
| 1583 | return written ? written : ret; |
| 1584 | } |
| 1585 | |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1586 | /* |
| 1587 | * This function only does anything for file systems which can't |
| 1588 | * handle sparse files. |
| 1589 | * |
| 1590 | * What we want to do here is fill in any hole between the current end |
| 1591 | * of allocation and the end of our write. That way the rest of the |
| 1592 | * write path can treat it as an non-allocating write, which has no |
| 1593 | * special case code for sparse/nonsparse files. |
| 1594 | */ |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1595 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, |
| 1596 | struct buffer_head *di_bh, |
| 1597 | loff_t pos, unsigned len, |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1598 | struct ocfs2_write_ctxt *wc) |
| 1599 | { |
| 1600 | int ret; |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1601 | loff_t newsize = pos + len; |
| 1602 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1603 | BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1604 | |
| 1605 | if (newsize <= i_size_read(inode)) |
| 1606 | return 0; |
| 1607 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1608 | ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1609 | if (ret) |
| 1610 | mlog_errno(ret); |
| 1611 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1612 | wc->w_first_new_cpos = |
| 1613 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); |
| 1614 | |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1615 | return ret; |
| 1616 | } |
| 1617 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1618 | static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh, |
| 1619 | loff_t pos) |
| 1620 | { |
| 1621 | int ret = 0; |
| 1622 | |
| 1623 | BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
| 1624 | if (pos > i_size_read(inode)) |
| 1625 | ret = ocfs2_zero_extend(inode, di_bh, pos); |
| 1626 | |
| 1627 | return ret; |
| 1628 | } |
| 1629 | |
Tao Ma | 0378da0f | 2010-08-12 10:25:28 +0800 | [diff] [blame] | 1630 | int ocfs2_write_begin_nolock(struct file *filp, |
| 1631 | struct address_space *mapping, |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1632 | loff_t pos, unsigned len, unsigned flags, |
| 1633 | struct page **pagep, void **fsdata, |
| 1634 | struct buffer_head *di_bh, struct page *mmap_page) |
| 1635 | { |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1636 | int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1637 | unsigned int clusters_to_alloc, extents_to_split; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1638 | struct ocfs2_write_ctxt *wc; |
| 1639 | struct inode *inode = mapping->host; |
| 1640 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1641 | struct ocfs2_dinode *di; |
| 1642 | struct ocfs2_alloc_context *data_ac = NULL; |
| 1643 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 1644 | handle_t *handle; |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1645 | struct ocfs2_extent_tree et; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1646 | |
| 1647 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); |
| 1648 | if (ret) { |
| 1649 | mlog_errno(ret); |
| 1650 | return ret; |
| 1651 | } |
| 1652 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1653 | if (ocfs2_supports_inline_data(osb)) { |
| 1654 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, |
| 1655 | mmap_page, wc); |
| 1656 | if (ret == 1) { |
| 1657 | ret = 0; |
| 1658 | goto success; |
| 1659 | } |
| 1660 | if (ret < 0) { |
| 1661 | mlog_errno(ret); |
| 1662 | goto out; |
| 1663 | } |
| 1664 | } |
| 1665 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1666 | if (ocfs2_sparse_alloc(osb)) |
| 1667 | ret = ocfs2_zero_tail(inode, di_bh, pos); |
| 1668 | else |
| 1669 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len, |
| 1670 | wc); |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1671 | if (ret) { |
| 1672 | mlog_errno(ret); |
| 1673 | goto out; |
| 1674 | } |
| 1675 | |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 1676 | ret = ocfs2_check_range_for_refcount(inode, pos, len); |
| 1677 | if (ret < 0) { |
| 1678 | mlog_errno(ret); |
| 1679 | goto out; |
| 1680 | } else if (ret == 1) { |
Tao Ma | 1550271 | 2010-08-12 10:36:38 +0800 | [diff] [blame] | 1681 | ret = ocfs2_refcount_cow(inode, filp, di_bh, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 1682 | wc->w_cpos, wc->w_clen, UINT_MAX); |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 1683 | if (ret) { |
| 1684 | mlog_errno(ret); |
| 1685 | goto out; |
| 1686 | } |
| 1687 | } |
| 1688 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1689 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
| 1690 | &extents_to_split); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1691 | if (ret) { |
| 1692 | mlog_errno(ret); |
| 1693 | goto out; |
| 1694 | } |
| 1695 | |
| 1696 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1697 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1698 | /* |
| 1699 | * We set w_target_from, w_target_to here so that |
| 1700 | * ocfs2_write_end() knows which range in the target page to |
| 1701 | * write out. An allocation requires that we write the entire |
| 1702 | * cluster range. |
| 1703 | */ |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1704 | if (clusters_to_alloc || extents_to_split) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1705 | /* |
| 1706 | * XXX: We are stretching the limits of |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1707 | * ocfs2_lock_allocators(). It greatly over-estimates |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1708 | * the work to be done. |
| 1709 | */ |
Tao Ma | e7d4cb6 | 2008-08-18 17:38:44 +0800 | [diff] [blame] | 1710 | mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u," |
| 1711 | " clusters_to_add = %u, extents_to_split = %u\n", |
| 1712 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1713 | (long long)i_size_read(inode), le32_to_cpu(di->i_clusters), |
| 1714 | clusters_to_alloc, extents_to_split); |
| 1715 | |
Joel Becker | 5e404e9 | 2009-02-13 03:54:22 -0800 | [diff] [blame] | 1716 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
| 1717 | wc->w_di_bh); |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1718 | ret = ocfs2_lock_allocators(inode, &et, |
Tao Ma | 231b87d | 2008-08-18 17:38:42 +0800 | [diff] [blame] | 1719 | clusters_to_alloc, extents_to_split, |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1720 | &data_ac, &meta_ac); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1721 | if (ret) { |
| 1722 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1723 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1724 | } |
| 1725 | |
Mark Fasheh | 4fe370a | 2009-12-07 13:15:40 -0800 | [diff] [blame] | 1726 | if (data_ac) |
| 1727 | data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; |
| 1728 | |
Tao Ma | 811f933 | 2008-08-18 17:38:43 +0800 | [diff] [blame] | 1729 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
| 1730 | &di->id2.i_list, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1731 | clusters_to_alloc); |
| 1732 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1733 | } |
| 1734 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1735 | /* |
| 1736 | * We have to zero sparse allocated clusters, unwritten extent clusters, |
| 1737 | * and non-sparse clusters we just extended. For non-sparse writes, |
| 1738 | * we know zeros will only be needed in the first and/or last cluster. |
| 1739 | */ |
| 1740 | if (clusters_to_alloc || extents_to_split || |
Sunil Mushran | 8379e7c | 2009-09-04 11:12:01 -0700 | [diff] [blame] | 1741 | (wc->w_clen && (wc->w_desc[0].c_needs_zero || |
| 1742 | wc->w_desc[wc->w_clen - 1].c_needs_zero))) |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1743 | cluster_of_pages = 1; |
| 1744 | else |
| 1745 | cluster_of_pages = 0; |
| 1746 | |
| 1747 | ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1748 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1749 | handle = ocfs2_start_trans(osb, credits); |
| 1750 | if (IS_ERR(handle)) { |
| 1751 | ret = PTR_ERR(handle); |
| 1752 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1753 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1754 | } |
| 1755 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1756 | wc->w_handle = handle; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1757 | |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 1758 | if (clusters_to_alloc) { |
| 1759 | ret = dquot_alloc_space_nodirty(inode, |
| 1760 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
| 1761 | if (ret) |
| 1762 | goto out_commit; |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1763 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1764 | /* |
| 1765 | * We don't want this to fail in ocfs2_write_end(), so do it |
| 1766 | * here. |
| 1767 | */ |
Joel Becker | 0cf2f76 | 2009-02-12 16:41:25 -0800 | [diff] [blame] | 1768 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
Joel Becker | 13723d0 | 2008-10-17 19:25:01 -0700 | [diff] [blame] | 1769 | OCFS2_JOURNAL_ACCESS_WRITE); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1770 | if (ret) { |
| 1771 | mlog_errno(ret); |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1772 | goto out_quota; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1773 | } |
| 1774 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1775 | /* |
| 1776 | * Fill our page array first. That way we've grabbed enough so |
| 1777 | * that we can zero and flush if we error after adding the |
| 1778 | * extent. |
| 1779 | */ |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1780 | ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len, |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1781 | cluster_of_pages, mmap_page); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1782 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1783 | mlog_errno(ret); |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1784 | goto out_quota; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1785 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1786 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1787 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
| 1788 | len); |
| 1789 | if (ret) { |
| 1790 | mlog_errno(ret); |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1791 | goto out_quota; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1792 | } |
| 1793 | |
| 1794 | if (data_ac) |
| 1795 | ocfs2_free_alloc_context(data_ac); |
| 1796 | if (meta_ac) |
| 1797 | ocfs2_free_alloc_context(meta_ac); |
| 1798 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1799 | success: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1800 | *pagep = wc->w_target_page; |
| 1801 | *fsdata = wc; |
| 1802 | return 0; |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1803 | out_quota: |
| 1804 | if (clusters_to_alloc) |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 1805 | dquot_free_space(inode, |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1806 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1807 | out_commit: |
| 1808 | ocfs2_commit_trans(osb, handle); |
| 1809 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1810 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1811 | ocfs2_free_write_ctxt(wc); |
| 1812 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1813 | if (data_ac) |
| 1814 | ocfs2_free_alloc_context(data_ac); |
| 1815 | if (meta_ac) |
| 1816 | ocfs2_free_alloc_context(meta_ac); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1817 | return ret; |
| 1818 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1819 | |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 1820 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
| 1821 | loff_t pos, unsigned len, unsigned flags, |
| 1822 | struct page **pagep, void **fsdata) |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1823 | { |
| 1824 | int ret; |
| 1825 | struct buffer_head *di_bh = NULL; |
| 1826 | struct inode *inode = mapping->host; |
| 1827 | |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 1828 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1829 | if (ret) { |
| 1830 | mlog_errno(ret); |
| 1831 | return ret; |
| 1832 | } |
| 1833 | |
| 1834 | /* |
| 1835 | * Take alloc sem here to prevent concurrent lookups. That way |
| 1836 | * the mapping, zeroing and tree manipulation within |
| 1837 | * ocfs2_write() will be safe against ->readpage(). This |
| 1838 | * should also serve to lock out allocation from a shared |
| 1839 | * writeable region. |
| 1840 | */ |
| 1841 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1842 | |
Tao Ma | 0378da0f | 2010-08-12 10:25:28 +0800 | [diff] [blame] | 1843 | ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1844 | fsdata, di_bh, NULL); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1845 | if (ret) { |
| 1846 | mlog_errno(ret); |
Mark Fasheh | c934a92 | 2007-10-18 15:23:46 -0700 | [diff] [blame] | 1847 | goto out_fail; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1848 | } |
| 1849 | |
| 1850 | brelse(di_bh); |
| 1851 | |
| 1852 | return 0; |
| 1853 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1854 | out_fail: |
| 1855 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1856 | |
| 1857 | brelse(di_bh); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 1858 | ocfs2_inode_unlock(inode, 1); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1859 | |
| 1860 | return ret; |
| 1861 | } |
| 1862 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1863 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
| 1864 | unsigned len, unsigned *copied, |
| 1865 | struct ocfs2_dinode *di, |
| 1866 | struct ocfs2_write_ctxt *wc) |
| 1867 | { |
| 1868 | void *kaddr; |
| 1869 | |
| 1870 | if (unlikely(*copied < len)) { |
| 1871 | if (!PageUptodate(wc->w_target_page)) { |
| 1872 | *copied = 0; |
| 1873 | return; |
| 1874 | } |
| 1875 | } |
| 1876 | |
| 1877 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); |
| 1878 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); |
| 1879 | kunmap_atomic(kaddr, KM_USER0); |
| 1880 | |
| 1881 | mlog(0, "Data written to inode at offset %llu. " |
| 1882 | "id_count = %u, copied = %u, i_dyn_features = 0x%x\n", |
| 1883 | (unsigned long long)pos, *copied, |
| 1884 | le16_to_cpu(di->id2.i_data.id_count), |
| 1885 | le16_to_cpu(di->i_dyn_features)); |
| 1886 | } |
| 1887 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1888 | int ocfs2_write_end_nolock(struct address_space *mapping, |
| 1889 | loff_t pos, unsigned len, unsigned copied, |
| 1890 | struct page *page, void *fsdata) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1891 | { |
| 1892 | int i; |
| 1893 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); |
| 1894 | struct inode *inode = mapping->host; |
| 1895 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1896 | struct ocfs2_write_ctxt *wc = fsdata; |
| 1897 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1898 | handle_t *handle = wc->w_handle; |
| 1899 | struct page *tmppage; |
| 1900 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1901 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1902 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); |
| 1903 | goto out_write_size; |
| 1904 | } |
| 1905 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1906 | if (unlikely(copied < len)) { |
| 1907 | if (!PageUptodate(wc->w_target_page)) |
| 1908 | copied = 0; |
| 1909 | |
| 1910 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, |
| 1911 | start+len); |
| 1912 | } |
| 1913 | flush_dcache_page(wc->w_target_page); |
| 1914 | |
| 1915 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1916 | tmppage = wc->w_pages[i]; |
| 1917 | |
| 1918 | if (tmppage == wc->w_target_page) { |
| 1919 | from = wc->w_target_from; |
| 1920 | to = wc->w_target_to; |
| 1921 | |
| 1922 | BUG_ON(from > PAGE_CACHE_SIZE || |
| 1923 | to > PAGE_CACHE_SIZE || |
| 1924 | to < from); |
| 1925 | } else { |
| 1926 | /* |
| 1927 | * Pages adjacent to the target (if any) imply |
| 1928 | * a hole-filling write in which case we want |
| 1929 | * to flush their entire range. |
| 1930 | */ |
| 1931 | from = 0; |
| 1932 | to = PAGE_CACHE_SIZE; |
| 1933 | } |
| 1934 | |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 1935 | if (page_has_buffers(tmppage)) { |
Mark Fasheh | 53ef99c | 2008-11-18 16:53:43 -0800 | [diff] [blame] | 1936 | if (ocfs2_should_order_data(inode)) |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 1937 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 1938 | block_commit_write(tmppage, from, to); |
| 1939 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1940 | } |
| 1941 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1942 | out_write_size: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1943 | pos += copied; |
| 1944 | if (pos > inode->i_size) { |
| 1945 | i_size_write(inode, pos); |
| 1946 | mark_inode_dirty(inode); |
| 1947 | } |
| 1948 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
| 1949 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
| 1950 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1951 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
| 1952 | 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] | 1953 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
| 1954 | |
| 1955 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | 59a5e41 | 2007-06-22 15:52:36 -0700 | [diff] [blame] | 1956 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1957 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
| 1958 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1959 | ocfs2_free_write_ctxt(wc); |
| 1960 | |
| 1961 | return copied; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1962 | } |
| 1963 | |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 1964 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
| 1965 | loff_t pos, unsigned len, unsigned copied, |
| 1966 | struct page *page, void *fsdata) |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1967 | { |
| 1968 | int ret; |
| 1969 | struct inode *inode = mapping->host; |
| 1970 | |
| 1971 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); |
| 1972 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1973 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 1974 | ocfs2_inode_unlock(inode, 1); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1975 | |
| 1976 | return ret; |
| 1977 | } |
| 1978 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1979 | const struct address_space_operations ocfs2_aops = { |
Hisashi Hifumi | 1fca3a0 | 2009-03-05 17:22:21 +0900 | [diff] [blame] | 1980 | .readpage = ocfs2_readpage, |
| 1981 | .readpages = ocfs2_readpages, |
| 1982 | .writepage = ocfs2_writepage, |
| 1983 | .write_begin = ocfs2_write_begin, |
| 1984 | .write_end = ocfs2_write_end, |
| 1985 | .bmap = ocfs2_bmap, |
| 1986 | .sync_page = block_sync_page, |
| 1987 | .direct_IO = ocfs2_direct_IO, |
| 1988 | .invalidatepage = ocfs2_invalidatepage, |
| 1989 | .releasepage = ocfs2_releasepage, |
| 1990 | .migratepage = buffer_migrate_page, |
| 1991 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1992 | .error_remove_page = generic_error_remove_page, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1993 | }; |