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 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 32 | #include <cluster/masklog.h> |
| 33 | |
| 34 | #include "ocfs2.h" |
| 35 | |
| 36 | #include "alloc.h" |
| 37 | #include "aops.h" |
| 38 | #include "dlmglue.h" |
| 39 | #include "extent_map.h" |
| 40 | #include "file.h" |
| 41 | #include "inode.h" |
| 42 | #include "journal.h" |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 43 | #include "suballoc.h" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 44 | #include "super.h" |
| 45 | #include "symlink.h" |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 46 | #include "refcounttree.h" |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 47 | #include "ocfs2_trace.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 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 62 | trace_ocfs2_symlink_get_block( |
| 63 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 64 | (unsigned long long)iblock, bh_result, create); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 65 | |
| 66 | BUG_ON(ocfs2_inode_is_fast_symlink(inode)); |
| 67 | |
| 68 | if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { |
| 69 | mlog(ML_ERROR, "block offset > PATH_MAX: %llu", |
| 70 | (unsigned long long)iblock); |
| 71 | goto bail; |
| 72 | } |
| 73 | |
Joel Becker | b657c95 | 2008-11-13 14:49:11 -0800 | [diff] [blame] | 74 | status = ocfs2_read_inode_block(inode, &bh); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 75 | if (status < 0) { |
| 76 | mlog_errno(status); |
| 77 | goto bail; |
| 78 | } |
| 79 | fe = (struct ocfs2_dinode *) bh->b_data; |
| 80 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 81 | if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, |
| 82 | le32_to_cpu(fe->i_clusters))) { |
| 83 | mlog(ML_ERROR, "block offset is outside the allocated size: " |
| 84 | "%llu\n", (unsigned long long)iblock); |
| 85 | goto bail; |
| 86 | } |
| 87 | |
| 88 | /* We don't use the page cache to create symlink data, so if |
| 89 | * need be, copy it over from the buffer cache. */ |
| 90 | if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { |
| 91 | u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + |
| 92 | iblock; |
| 93 | buffer_cache_bh = sb_getblk(osb->sb, blkno); |
| 94 | if (!buffer_cache_bh) { |
| 95 | mlog(ML_ERROR, "couldn't getblock for symlink!\n"); |
| 96 | goto bail; |
| 97 | } |
| 98 | |
| 99 | /* we haven't locked out transactions, so a commit |
| 100 | * could've happened. Since we've got a reference on |
| 101 | * the bh, even if it commits while we're doing the |
| 102 | * copy, the data is still good. */ |
| 103 | if (buffer_jbd(buffer_cache_bh) |
| 104 | && ocfs2_inode_is_new(inode)) { |
| 105 | kaddr = kmap_atomic(bh_result->b_page, KM_USER0); |
| 106 | if (!kaddr) { |
| 107 | mlog(ML_ERROR, "couldn't kmap!\n"); |
| 108 | goto bail; |
| 109 | } |
| 110 | memcpy(kaddr + (bh_result->b_size * iblock), |
| 111 | buffer_cache_bh->b_data, |
| 112 | bh_result->b_size); |
| 113 | kunmap_atomic(kaddr, KM_USER0); |
| 114 | set_buffer_uptodate(bh_result); |
| 115 | } |
| 116 | brelse(buffer_cache_bh); |
| 117 | } |
| 118 | |
| 119 | map_bh(bh_result, inode->i_sb, |
| 120 | le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); |
| 121 | |
| 122 | err = 0; |
| 123 | |
| 124 | bail: |
Mark Fasheh | a81cb88 | 2008-10-07 14:25:16 -0700 | [diff] [blame] | 125 | brelse(bh); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 126 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 139 | trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 140 | (unsigned long long)iblock, bh_result, create); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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 | b069705 | 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)); |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 202 | |
| 203 | trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 204 | (unsigned long long)past_eof); |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 205 | if (create && (iblock >= past_eof)) |
| 206 | set_buffer_new(bh_result); |
| 207 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 208 | bail: |
| 209 | if (err < 0) |
| 210 | err = -EIO; |
| 211 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 281 | trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, |
| 282 | (page ? page->index : 0)); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 283 | |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 284 | ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 285 | if (ret != 0) { |
| 286 | if (ret == AOP_TRUNCATED_PAGE) |
| 287 | unlock = 0; |
| 288 | mlog_errno(ret); |
| 289 | goto out; |
| 290 | } |
| 291 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 292 | if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 293 | ret = AOP_TRUNCATED_PAGE; |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 294 | goto out_inode_unlock; |
Mark Fasheh | e9dfc0b | 2007-05-14 11:38:51 -0700 | [diff] [blame] | 295 | } |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 296 | |
| 297 | /* |
| 298 | * i_size might have just been updated as we grabed the meta lock. We |
| 299 | * might now be discovering a truncate that hit on another node. |
| 300 | * block_read_full_page->get_block freaks out if it is asked to read |
| 301 | * beyond the end of a file, so we check here. Callers |
Nick Piggin | 54cb882 | 2007-07-19 01:46:59 -0700 | [diff] [blame] | 302 | * (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] | 303 | * and notice that the page they just read isn't needed. |
| 304 | * |
| 305 | * XXX sys_readahead() seems to get that wrong? |
| 306 | */ |
| 307 | if (start >= i_size_read(inode)) { |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 308 | zero_user(page, 0, PAGE_SIZE); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 309 | SetPageUptodate(page); |
| 310 | ret = 0; |
| 311 | goto out_alloc; |
| 312 | } |
| 313 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 314 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 315 | ret = ocfs2_readpage_inline(inode, page); |
| 316 | else |
| 317 | ret = block_read_full_page(page, ocfs2_get_block); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 318 | unlock = 0; |
| 319 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 320 | out_alloc: |
| 321 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 322 | out_inode_unlock: |
| 323 | ocfs2_inode_unlock(inode, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 324 | out: |
| 325 | if (unlock) |
| 326 | unlock_page(page); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 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 | { |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 399 | trace_ocfs2_writepage( |
| 400 | (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, |
| 401 | page->index); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 402 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 403 | return block_write_full_page(page, ocfs2_get_block, wbc); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 404 | } |
| 405 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 406 | /* Taken from ext3. We don't necessarily need the full blown |
| 407 | * functionality yet, but IMHO it's better to cut and paste the whole |
| 408 | * thing so we can avoid introducing our own bugs (and easily pick up |
| 409 | * their fixes when they happen) --Mark */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 410 | int walk_page_buffers( handle_t *handle, |
| 411 | struct buffer_head *head, |
| 412 | unsigned from, |
| 413 | unsigned to, |
| 414 | int *partial, |
| 415 | int (*fn)( handle_t *handle, |
| 416 | struct buffer_head *bh)) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 417 | { |
| 418 | struct buffer_head *bh; |
| 419 | unsigned block_start, block_end; |
| 420 | unsigned blocksize = head->b_size; |
| 421 | int err, ret = 0; |
| 422 | struct buffer_head *next; |
| 423 | |
| 424 | for ( bh = head, block_start = 0; |
| 425 | ret == 0 && (bh != head || !block_start); |
| 426 | block_start = block_end, bh = next) |
| 427 | { |
| 428 | next = bh->b_this_page; |
| 429 | block_end = block_start + blocksize; |
| 430 | if (block_end <= from || block_start >= to) { |
| 431 | if (partial && !buffer_uptodate(bh)) |
| 432 | *partial = 1; |
| 433 | continue; |
| 434 | } |
| 435 | err = (*fn)(handle, bh); |
| 436 | if (!ret) |
| 437 | ret = err; |
| 438 | } |
| 439 | return ret; |
| 440 | } |
| 441 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 442 | static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) |
| 443 | { |
| 444 | sector_t status; |
| 445 | u64 p_blkno = 0; |
| 446 | int err = 0; |
| 447 | struct inode *inode = mapping->host; |
| 448 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 449 | trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 450 | (unsigned long long)block); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 451 | |
| 452 | /* We don't need to lock journal system files, since they aren't |
| 453 | * accessed concurrently from multiple nodes. |
| 454 | */ |
| 455 | if (!INODE_JOURNAL(inode)) { |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 456 | err = ocfs2_inode_lock(inode, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 457 | if (err) { |
| 458 | if (err != -ENOENT) |
| 459 | mlog_errno(err); |
| 460 | goto bail; |
| 461 | } |
| 462 | down_read(&OCFS2_I(inode)->ip_alloc_sem); |
| 463 | } |
| 464 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 465 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 466 | err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, |
| 467 | NULL); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 468 | |
| 469 | if (!INODE_JOURNAL(inode)) { |
| 470 | up_read(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 471 | ocfs2_inode_unlock(inode, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | if (err) { |
| 475 | mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", |
| 476 | (unsigned long long)block); |
| 477 | mlog_errno(err); |
| 478 | goto bail; |
| 479 | } |
| 480 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 481 | bail: |
| 482 | status = err ? 0 : p_blkno; |
| 483 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 484 | return status; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * TODO: Make this into a generic get_blocks function. |
| 489 | * |
| 490 | * From do_direct_io in direct-io.c: |
| 491 | * "So what we do is to permit the ->get_blocks function to populate |
| 492 | * bh.b_size with the size of IO which is permitted at this offset and |
| 493 | * this i_blkbits." |
| 494 | * |
| 495 | * This function is called directly from get_more_blocks in direct-io.c. |
| 496 | * |
| 497 | * called like this: dio->get_blocks(dio->inode, fs_startblk, |
| 498 | * fs_count, map_bh, dio->rw == WRITE); |
Christoph Hellwig | 5fe878a | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 499 | * |
| 500 | * Note that we never bother to allocate blocks here, and thus ignore the |
| 501 | * create argument. |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 502 | */ |
| 503 | 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] | 504 | struct buffer_head *bh_result, int create) |
| 505 | { |
| 506 | int ret; |
Mark Fasheh | 4f902c3 | 2007-03-09 16:26:50 -0800 | [diff] [blame] | 507 | u64 p_blkno, inode_blocks, contig_blocks; |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 508 | unsigned int ext_flags; |
Florin Malita | 184d7d2 | 2006-06-03 19:30:10 -0400 | [diff] [blame] | 509 | unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 510 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 511 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 512 | /* This function won't even be called if the request isn't all |
| 513 | * nicely aligned and of the right size, so there's no need |
| 514 | * for us to check any of that. */ |
| 515 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 516 | 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] | 517 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 518 | /* This figures out the size of the next contiguous block, and |
| 519 | * our logical offset */ |
Mark Fasheh | 363041a | 2007-01-17 12:31:35 -0800 | [diff] [blame] | 520 | ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 521 | &contig_blocks, &ext_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 522 | if (ret) { |
| 523 | mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n", |
| 524 | (unsigned long long)iblock); |
| 525 | ret = -EIO; |
| 526 | goto bail; |
| 527 | } |
| 528 | |
Tao Ma | cbaee47 | 2010-02-26 10:54:52 +0800 | [diff] [blame] | 529 | /* We should already CoW the refcounted extent in case of create. */ |
| 530 | BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED)); |
| 531 | |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 532 | /* |
| 533 | * get_more_blocks() expects us to describe a hole by clearing |
| 534 | * the mapped bit on bh_result(). |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 535 | * |
| 536 | * Consider an unwritten extent as a hole. |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 537 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 538 | if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 539 | map_bh(bh_result, inode->i_sb, p_blkno); |
Christoph Hellwig | 5fe878a | 2009-12-15 16:47:50 -0800 | [diff] [blame] | 540 | else |
Mark Fasheh | 25baf2d | 2007-02-14 15:30:30 -0800 | [diff] [blame] | 541 | clear_buffer_mapped(bh_result); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 542 | |
| 543 | /* make sure we don't map more than max_blocks blocks here as |
| 544 | that's all the kernel will handle at this point. */ |
| 545 | if (max_blocks < contig_blocks) |
| 546 | contig_blocks = max_blocks; |
| 547 | bh_result->b_size = contig_blocks << blocksize_bits; |
| 548 | bail: |
| 549 | return ret; |
| 550 | } |
| 551 | |
Sunil Mushran | 2bd6321 | 2010-01-25 16:57:38 -0800 | [diff] [blame] | 552 | /* |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 553 | * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 554 | * particularly interested in the aio/dio case. We use the rw_lock DLM lock |
| 555 | * to protect io on one node from truncation on another. |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 556 | */ |
| 557 | static void ocfs2_dio_end_io(struct kiocb *iocb, |
| 558 | loff_t offset, |
| 559 | ssize_t bytes, |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 560 | void *private, |
| 561 | int ret, |
| 562 | bool is_async) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 563 | { |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 564 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 565 | int level; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 566 | |
| 567 | /* this io's submitter should not have unlocked this before we could */ |
| 568 | BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 569 | |
Christoph Hellwig | df2d6f2 | 2011-06-24 14:29:46 -0400 | [diff] [blame] | 570 | if (ocfs2_iocb_is_sem_locked(iocb)) |
Tristan Ye | 39c99f1 | 2010-12-07 14:35:07 +0800 | [diff] [blame] | 571 | ocfs2_iocb_clear_sem_locked(iocb); |
Tristan Ye | 39c99f1 | 2010-12-07 14:35:07 +0800 | [diff] [blame] | 572 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 573 | ocfs2_iocb_clear_rw_locked(iocb); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 574 | |
| 575 | level = ocfs2_iocb_rw_locked_level(iocb); |
Mark Fasheh | 7cdfc3a | 2007-04-16 17:28:51 -0700 | [diff] [blame] | 576 | ocfs2_rw_unlock(inode, level); |
Christoph Hellwig | 40e2e97 | 2010-07-18 21:17:09 +0000 | [diff] [blame] | 577 | |
| 578 | if (is_async) |
| 579 | aio_complete(iocb, ret, 0); |
Christoph Hellwig | 72c5052 | 2011-06-24 14:29:48 -0400 | [diff] [blame] | 580 | inode_dio_done(inode); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 581 | } |
| 582 | |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 583 | /* |
| 584 | * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen |
| 585 | * from ext3. PageChecked() bits have been removed as OCFS2 does not |
| 586 | * do journalled data. |
| 587 | */ |
| 588 | static void ocfs2_invalidatepage(struct page *page, unsigned long offset) |
| 589 | { |
| 590 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 591 | |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 592 | jbd2_journal_invalidatepage(journal, page, offset); |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | static int ocfs2_releasepage(struct page *page, gfp_t wait) |
| 596 | { |
| 597 | journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
| 598 | |
| 599 | if (!page_has_buffers(page)) |
| 600 | return 0; |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 601 | return jbd2_journal_try_to_free_buffers(journal, page, wait); |
Joel Becker | 03f981c | 2007-01-04 14:54:41 -0800 | [diff] [blame] | 602 | } |
| 603 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 604 | static ssize_t ocfs2_direct_IO(int rw, |
| 605 | struct kiocb *iocb, |
| 606 | const struct iovec *iov, |
| 607 | loff_t offset, |
| 608 | unsigned long nr_segs) |
| 609 | { |
| 610 | struct file *file = iocb->ki_filp; |
Josef Sipek | d28c917 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 611 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
Mark Fasheh | 53013cb | 2006-05-05 19:04:03 -0700 | [diff] [blame] | 612 | |
Mark Fasheh | 6798d35 | 2007-09-07 14:05:51 -0700 | [diff] [blame] | 613 | /* |
| 614 | * Fallback to buffered I/O if we see an inode without |
| 615 | * extents. |
| 616 | */ |
| 617 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| 618 | return 0; |
| 619 | |
Tao Ma | b80474b | 2009-09-10 15:28:47 +0800 | [diff] [blame] | 620 | /* Fallback to buffered I/O if we are appending. */ |
| 621 | if (i_size_read(inode) <= offset) |
| 622 | return 0; |
| 623 | |
Tao Ma | c1e8d35 | 2011-03-07 16:43:21 +0800 | [diff] [blame] | 624 | return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, |
| 625 | iov, offset, nr_segs, |
| 626 | ocfs2_direct_IO_get_blocks, |
| 627 | ocfs2_dio_end_io, NULL, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 628 | } |
| 629 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 630 | static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, |
| 631 | u32 cpos, |
| 632 | unsigned int *start, |
| 633 | unsigned int *end) |
| 634 | { |
| 635 | unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE; |
| 636 | |
| 637 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { |
| 638 | unsigned int cpp; |
| 639 | |
| 640 | cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits); |
| 641 | |
| 642 | cluster_start = cpos % cpp; |
| 643 | cluster_start = cluster_start << osb->s_clustersize_bits; |
| 644 | |
| 645 | cluster_end = cluster_start + osb->s_clustersize; |
| 646 | } |
| 647 | |
| 648 | BUG_ON(cluster_start > PAGE_SIZE); |
| 649 | BUG_ON(cluster_end > PAGE_SIZE); |
| 650 | |
| 651 | if (start) |
| 652 | *start = cluster_start; |
| 653 | if (end) |
| 654 | *end = cluster_end; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * 'from' and 'to' are the region in the page to avoid zeroing. |
| 659 | * |
| 660 | * If pagesize > clustersize, this function will avoid zeroing outside |
| 661 | * of the cluster boundary. |
| 662 | * |
| 663 | * from == to == 0 is code for "zero the entire cluster region" |
| 664 | */ |
| 665 | static void ocfs2_clear_page_regions(struct page *page, |
| 666 | struct ocfs2_super *osb, u32 cpos, |
| 667 | unsigned from, unsigned to) |
| 668 | { |
| 669 | void *kaddr; |
| 670 | unsigned int cluster_start, cluster_end; |
| 671 | |
| 672 | ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); |
| 673 | |
| 674 | kaddr = kmap_atomic(page, KM_USER0); |
| 675 | |
| 676 | if (from || to) { |
| 677 | if (from > cluster_start) |
| 678 | memset(kaddr + cluster_start, 0, from - cluster_start); |
| 679 | if (to < cluster_end) |
| 680 | memset(kaddr + to, 0, cluster_end - to); |
| 681 | } else { |
| 682 | memset(kaddr + cluster_start, 0, cluster_end - cluster_start); |
| 683 | } |
| 684 | |
| 685 | kunmap_atomic(kaddr, KM_USER0); |
| 686 | } |
| 687 | |
| 688 | /* |
Mark Fasheh | 4e9563f | 2007-11-01 11:37:48 -0700 | [diff] [blame] | 689 | * Nonsparse file systems fully allocate before we get to the write |
| 690 | * code. This prevents ocfs2_write() from tagging the write as an |
| 691 | * allocating one, which means ocfs2_map_page_blocks() might try to |
| 692 | * read-in the blocks at the tail of our file. Avoid reading them by |
| 693 | * testing i_size against each block offset. |
| 694 | */ |
| 695 | static int ocfs2_should_read_blk(struct inode *inode, struct page *page, |
| 696 | unsigned int block_start) |
| 697 | { |
| 698 | u64 offset = page_offset(page) + block_start; |
| 699 | |
| 700 | if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| 701 | return 1; |
| 702 | |
| 703 | if (i_size_read(inode) > offset) |
| 704 | return 1; |
| 705 | |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | /* |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 710 | * Some of this taken from __block_write_begin(). We already have our |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 711 | * mapping by now though, and the entire write will be allocating or |
| 712 | * it won't, so not much need to use BH_New. |
| 713 | * |
| 714 | * This will also skip zeroing, which is handled externally. |
| 715 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 716 | int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, |
| 717 | struct inode *inode, unsigned int from, |
| 718 | unsigned int to, int new) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 719 | { |
| 720 | int ret = 0; |
| 721 | struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; |
| 722 | unsigned int block_end, block_start; |
| 723 | unsigned int bsize = 1 << inode->i_blkbits; |
| 724 | |
| 725 | if (!page_has_buffers(page)) |
| 726 | create_empty_buffers(page, bsize, 0); |
| 727 | |
| 728 | head = page_buffers(page); |
| 729 | for (bh = head, block_start = 0; bh != head || !block_start; |
| 730 | bh = bh->b_this_page, block_start += bsize) { |
| 731 | block_end = block_start + bsize; |
| 732 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 733 | clear_buffer_new(bh); |
| 734 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 735 | /* |
| 736 | * Ignore blocks outside of our i/o range - |
| 737 | * they may belong to unallocated clusters. |
| 738 | */ |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 739 | if (block_start >= to || block_end <= from) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 740 | if (PageUptodate(page)) |
| 741 | set_buffer_uptodate(bh); |
| 742 | continue; |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * For an allocating write with cluster size >= page |
| 747 | * size, we always write the entire page. |
| 748 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 749 | if (new) |
| 750 | set_buffer_new(bh); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 751 | |
| 752 | if (!buffer_mapped(bh)) { |
| 753 | map_bh(bh, inode->i_sb, *p_blkno); |
| 754 | unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); |
| 755 | } |
| 756 | |
| 757 | if (PageUptodate(page)) { |
| 758 | if (!buffer_uptodate(bh)) |
| 759 | set_buffer_uptodate(bh); |
| 760 | } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 761 | !buffer_new(bh) && |
Mark Fasheh | 4e9563f | 2007-11-01 11:37:48 -0700 | [diff] [blame] | 762 | ocfs2_should_read_blk(inode, page, block_start) && |
Mark Fasheh | bce9976 | 2007-06-18 11:12:36 -0700 | [diff] [blame] | 763 | (block_start < from || block_end > to)) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 764 | ll_rw_block(READ, 1, &bh); |
| 765 | *wait_bh++=bh; |
| 766 | } |
| 767 | |
| 768 | *p_blkno = *p_blkno + 1; |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * If we issued read requests - let them complete. |
| 773 | */ |
| 774 | while(wait_bh > wait) { |
| 775 | wait_on_buffer(*--wait_bh); |
| 776 | if (!buffer_uptodate(*wait_bh)) |
| 777 | ret = -EIO; |
| 778 | } |
| 779 | |
| 780 | if (ret == 0 || !new) |
| 781 | return ret; |
| 782 | |
| 783 | /* |
| 784 | * If we get -EIO above, zero out any newly allocated blocks |
| 785 | * to avoid exposing stale data. |
| 786 | */ |
| 787 | bh = head; |
| 788 | block_start = 0; |
| 789 | do { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 790 | block_end = block_start + bsize; |
| 791 | if (block_end <= from) |
| 792 | goto next_bh; |
| 793 | if (block_start >= to) |
| 794 | break; |
| 795 | |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 796 | zero_user(page, block_start, bh->b_size); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 797 | set_buffer_uptodate(bh); |
| 798 | mark_buffer_dirty(bh); |
| 799 | |
| 800 | next_bh: |
| 801 | block_start = block_end; |
| 802 | bh = bh->b_this_page; |
| 803 | } while (bh != head); |
| 804 | |
| 805 | return ret; |
| 806 | } |
| 807 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 808 | #if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) |
| 809 | #define OCFS2_MAX_CTXT_PAGES 1 |
| 810 | #else |
| 811 | #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) |
| 812 | #endif |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 813 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 814 | #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
Mark Fasheh | 6af67d8 | 2007-03-06 17:24:46 -0800 | [diff] [blame] | 815 | |
| 816 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 817 | * Describe the state of a single cluster to be written to. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 818 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 819 | struct ocfs2_write_cluster_desc { |
| 820 | u32 c_cpos; |
| 821 | u32 c_phys; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 822 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 823 | * Give this a unique field because c_phys eventually gets |
| 824 | * filled. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 825 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 826 | unsigned c_new; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 827 | unsigned c_unwritten; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 828 | unsigned c_needs_zero; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 829 | }; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 830 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 831 | struct ocfs2_write_ctxt { |
| 832 | /* Logical cluster position / len of write */ |
| 833 | u32 w_cpos; |
| 834 | u32 w_clen; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 835 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 836 | /* First cluster allocated in a nonsparse extend */ |
| 837 | u32 w_first_new_cpos; |
| 838 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 839 | struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 840 | |
| 841 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 842 | * This is true if page_size > cluster_size. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 843 | * |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 844 | * It triggers a set of special cases during write which might |
| 845 | * have to deal with allocating writes to partial pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 846 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 847 | unsigned int w_large_pages; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 848 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 849 | /* |
| 850 | * Pages involved in this write. |
| 851 | * |
| 852 | * w_target_page is the page being written to by the user. |
| 853 | * |
| 854 | * w_pages is an array of pages which always contains |
| 855 | * w_target_page, and in the case of an allocating write with |
| 856 | * page_size < cluster size, it will contain zero'd and mapped |
| 857 | * pages adjacent to w_target_page which need to be written |
| 858 | * out in so that future reads from that region will get |
| 859 | * zero's. |
| 860 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 861 | unsigned int w_num_pages; |
Goldwyn Rodrigues | 83fd9c7 | 2010-06-10 17:21:36 -0500 | [diff] [blame] | 862 | struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 863 | struct page *w_target_page; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 864 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 865 | /* |
| 866 | * ocfs2_write_end() uses this to know what the real range to |
| 867 | * write in the target should be. |
| 868 | */ |
| 869 | unsigned int w_target_from; |
| 870 | unsigned int w_target_to; |
| 871 | |
| 872 | /* |
| 873 | * We could use journal_current_handle() but this is cleaner, |
| 874 | * IMHO -Mark |
| 875 | */ |
| 876 | handle_t *w_handle; |
| 877 | |
| 878 | struct buffer_head *w_di_bh; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 879 | |
| 880 | struct ocfs2_cached_dealloc_ctxt w_dealloc; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 881 | }; |
| 882 | |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 883 | void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 884 | { |
| 885 | int i; |
| 886 | |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 887 | for(i = 0; i < num_pages; i++) { |
| 888 | if (pages[i]) { |
| 889 | unlock_page(pages[i]); |
| 890 | mark_page_accessed(pages[i]); |
| 891 | page_cache_release(pages[i]); |
| 892 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 893 | } |
Mark Fasheh | 1d410a6 | 2007-09-07 14:20:45 -0700 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) |
| 897 | { |
| 898 | ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 899 | |
| 900 | brelse(wc->w_di_bh); |
| 901 | kfree(wc); |
| 902 | } |
| 903 | |
| 904 | static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, |
| 905 | struct ocfs2_super *osb, loff_t pos, |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 906 | unsigned len, struct buffer_head *di_bh) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 907 | { |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 908 | u32 cend; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 909 | struct ocfs2_write_ctxt *wc; |
| 910 | |
| 911 | wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); |
| 912 | if (!wc) |
| 913 | return -ENOMEM; |
| 914 | |
| 915 | wc->w_cpos = pos >> osb->s_clustersize_bits; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 916 | wc->w_first_new_cpos = UINT_MAX; |
tao.ma@oracle.com | 30b8548 | 2007-09-06 08:02:25 +0800 | [diff] [blame] | 917 | cend = (pos + len - 1) >> osb->s_clustersize_bits; |
| 918 | wc->w_clen = cend - wc->w_cpos + 1; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 919 | get_bh(di_bh); |
| 920 | wc->w_di_bh = di_bh; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 921 | |
| 922 | if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) |
| 923 | wc->w_large_pages = 1; |
| 924 | else |
| 925 | wc->w_large_pages = 0; |
| 926 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 927 | ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
| 928 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 929 | *wcp = wc; |
| 930 | |
| 931 | return 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 932 | } |
| 933 | |
| 934 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 935 | * If a page has any new buffers, zero them out here, and mark them uptodate |
| 936 | * and dirty so they'll be written out (in order to prevent uninitialised |
| 937 | * block data from leaking). And clear the new bit. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 938 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 939 | 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] | 940 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 941 | unsigned int block_start, block_end; |
| 942 | struct buffer_head *head, *bh; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 943 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 944 | BUG_ON(!PageLocked(page)); |
| 945 | if (!page_has_buffers(page)) |
| 946 | return; |
| 947 | |
| 948 | bh = head = page_buffers(page); |
| 949 | block_start = 0; |
| 950 | do { |
| 951 | block_end = block_start + bh->b_size; |
| 952 | |
| 953 | if (buffer_new(bh)) { |
| 954 | if (block_end > from && block_start < to) { |
| 955 | if (!PageUptodate(page)) { |
| 956 | unsigned start, end; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 957 | |
| 958 | start = max(from, block_start); |
| 959 | end = min(to, block_end); |
| 960 | |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 961 | zero_user_segment(page, start, end); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 962 | set_buffer_uptodate(bh); |
| 963 | } |
| 964 | |
| 965 | clear_buffer_new(bh); |
| 966 | mark_buffer_dirty(bh); |
| 967 | } |
| 968 | } |
| 969 | |
| 970 | block_start = block_end; |
| 971 | bh = bh->b_this_page; |
| 972 | } while (bh != head); |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | * Only called when we have a failure during allocating write to write |
| 977 | * zero's to the newly allocated region. |
| 978 | */ |
| 979 | static void ocfs2_write_failure(struct inode *inode, |
| 980 | struct ocfs2_write_ctxt *wc, |
| 981 | loff_t user_pos, unsigned user_len) |
| 982 | { |
| 983 | int i; |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame] | 984 | unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), |
| 985 | to = user_pos + user_len; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 986 | struct page *tmppage; |
| 987 | |
Mark Fasheh | 5c26a7b | 2007-09-18 17:49:29 -0700 | [diff] [blame] | 988 | ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 989 | |
| 990 | for(i = 0; i < wc->w_num_pages; i++) { |
| 991 | tmppage = wc->w_pages[i]; |
| 992 | |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 993 | if (page_has_buffers(tmppage)) { |
Mark Fasheh | 53ef99c | 2008-11-18 16:53:43 -0800 | [diff] [blame] | 994 | if (ocfs2_should_order_data(inode)) |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 995 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 996 | |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 997 | block_commit_write(tmppage, from, to); |
| 998 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, |
| 1003 | struct ocfs2_write_ctxt *wc, |
| 1004 | struct page *page, u32 cpos, |
| 1005 | loff_t user_pos, unsigned user_len, |
| 1006 | int new) |
| 1007 | { |
| 1008 | int ret; |
| 1009 | unsigned int map_from = 0, map_to = 0; |
| 1010 | unsigned int cluster_start, cluster_end; |
| 1011 | unsigned int user_data_from = 0, user_data_to = 0; |
| 1012 | |
| 1013 | ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1014 | &cluster_start, &cluster_end); |
| 1015 | |
Goldwyn Rodrigues | 272b62c | 2011-02-17 09:44:40 -0600 | [diff] [blame] | 1016 | /* treat the write as new if the a hole/lseek spanned across |
| 1017 | * the page boundary. |
| 1018 | */ |
| 1019 | new = new | ((i_size_read(inode) <= page_offset(page)) && |
| 1020 | (page_offset(page) <= user_pos)); |
| 1021 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1022 | if (page == wc->w_target_page) { |
| 1023 | map_from = user_pos & (PAGE_CACHE_SIZE - 1); |
| 1024 | map_to = map_from + user_len; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1025 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1026 | if (new) |
| 1027 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 1028 | cluster_start, cluster_end, |
| 1029 | new); |
| 1030 | else |
| 1031 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
| 1032 | map_from, map_to, new); |
| 1033 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1034 | mlog_errno(ret); |
| 1035 | goto out; |
| 1036 | } |
| 1037 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1038 | user_data_from = map_from; |
| 1039 | user_data_to = map_to; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1040 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1041 | map_from = cluster_start; |
| 1042 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1043 | } |
| 1044 | } else { |
| 1045 | /* |
| 1046 | * If we haven't allocated the new page yet, we |
| 1047 | * shouldn't be writing it out without copying user |
| 1048 | * data. This is likely a math error from the caller. |
| 1049 | */ |
| 1050 | BUG_ON(!new); |
| 1051 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1052 | map_from = cluster_start; |
| 1053 | map_to = cluster_end; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1054 | |
| 1055 | ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1056 | cluster_start, cluster_end, new); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1057 | if (ret) { |
| 1058 | mlog_errno(ret); |
| 1059 | goto out; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | /* |
| 1064 | * Parts of newly allocated pages need to be zero'd. |
| 1065 | * |
| 1066 | * Above, we have also rewritten 'to' and 'from' - as far as |
| 1067 | * the rest of the function is concerned, the entire cluster |
| 1068 | * range inside of a page needs to be written. |
| 1069 | * |
| 1070 | * We can skip this if the page is up to date - it's already |
| 1071 | * been zero'd from being read in as a hole. |
| 1072 | */ |
| 1073 | if (new && !PageUptodate(page)) |
| 1074 | ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1075 | cpos, user_data_from, user_data_to); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1076 | |
| 1077 | flush_dcache_page(page); |
| 1078 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1079 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1080 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1081 | } |
| 1082 | |
| 1083 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1084 | * This function will only grab one clusters worth of pages. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1085 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1086 | static int ocfs2_grab_pages_for_write(struct address_space *mapping, |
| 1087 | struct ocfs2_write_ctxt *wc, |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1088 | u32 cpos, loff_t user_pos, |
| 1089 | unsigned user_len, int new, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1090 | struct page *mmap_page) |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1091 | { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1092 | int ret = 0, i; |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1093 | unsigned long start, target_index, end_index, index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1094 | struct inode *inode = mapping->host; |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1095 | loff_t last_byte; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1096 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1097 | target_index = user_pos >> PAGE_CACHE_SHIFT; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1098 | |
| 1099 | /* |
| 1100 | * Figure out how many pages we'll be manipulating here. For |
Mark Fasheh | 60b1139 | 2007-02-16 11:46:50 -0800 | [diff] [blame] | 1101 | * non allocating write, we just change the one |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1102 | * page. Otherwise, we'll need a whole clusters worth. If we're |
| 1103 | * writing past i_size, we only need enough pages to cover the |
| 1104 | * last page of the write. |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1105 | */ |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1106 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1107 | wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); |
| 1108 | start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1109 | /* |
| 1110 | * We need the index *past* the last page we could possibly |
| 1111 | * touch. This is the page past the end of the write or |
| 1112 | * i_size, whichever is greater. |
| 1113 | */ |
| 1114 | last_byte = max(user_pos + user_len, i_size_read(inode)); |
| 1115 | BUG_ON(last_byte < 1); |
| 1116 | end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1; |
| 1117 | if ((start + wc->w_num_pages) > end_index) |
| 1118 | wc->w_num_pages = end_index - start; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1119 | } else { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1120 | wc->w_num_pages = 1; |
| 1121 | start = target_index; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1122 | } |
| 1123 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1124 | for(i = 0; i < wc->w_num_pages; i++) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1125 | index = start + i; |
| 1126 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1127 | if (index == target_index && mmap_page) { |
| 1128 | /* |
| 1129 | * ocfs2_pagemkwrite() is a little different |
| 1130 | * and wants us to directly use the page |
| 1131 | * passed in. |
| 1132 | */ |
| 1133 | lock_page(mmap_page); |
| 1134 | |
| 1135 | if (mmap_page->mapping != mapping) { |
| 1136 | unlock_page(mmap_page); |
| 1137 | /* |
| 1138 | * Sanity check - the locking in |
| 1139 | * ocfs2_pagemkwrite() should ensure |
| 1140 | * that this code doesn't trigger. |
| 1141 | */ |
| 1142 | ret = -EINVAL; |
| 1143 | mlog_errno(ret); |
| 1144 | goto out; |
| 1145 | } |
| 1146 | |
| 1147 | page_cache_get(mmap_page); |
| 1148 | wc->w_pages[i] = mmap_page; |
| 1149 | } else { |
| 1150 | wc->w_pages[i] = find_or_create_page(mapping, index, |
| 1151 | GFP_NOFS); |
| 1152 | if (!wc->w_pages[i]) { |
| 1153 | ret = -ENOMEM; |
| 1154 | mlog_errno(ret); |
| 1155 | goto out; |
| 1156 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1157 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1158 | |
| 1159 | if (index == target_index) |
| 1160 | wc->w_target_page = wc->w_pages[i]; |
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 | out: |
| 1163 | return ret; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * Prepare a single cluster for write one cluster into the file. |
| 1168 | */ |
| 1169 | static int ocfs2_write_cluster(struct address_space *mapping, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1170 | u32 phys, unsigned int unwritten, |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1171 | unsigned int should_zero, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1172 | struct ocfs2_alloc_context *data_ac, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1173 | struct ocfs2_alloc_context *meta_ac, |
| 1174 | struct ocfs2_write_ctxt *wc, u32 cpos, |
| 1175 | loff_t user_pos, unsigned user_len) |
| 1176 | { |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1177 | int ret, i, new; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1178 | u64 v_blkno, p_blkno; |
| 1179 | struct inode *inode = mapping->host; |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1180 | struct ocfs2_extent_tree et; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1181 | |
| 1182 | new = phys == 0 ? 1 : 0; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1183 | if (new) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1184 | u32 tmp_pos; |
| 1185 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1186 | /* |
| 1187 | * This is safe to call with the page locks - it won't take |
| 1188 | * any additional semaphores or cluster locks. |
| 1189 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1190 | tmp_pos = cpos; |
Tao Ma | 0eb8d47 | 2008-08-18 17:38:45 +0800 | [diff] [blame] | 1191 | ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, |
| 1192 | &tmp_pos, 1, 0, wc->w_di_bh, |
| 1193 | wc->w_handle, data_ac, |
| 1194 | meta_ac, NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1195 | /* |
| 1196 | * This shouldn't happen because we must have already |
| 1197 | * calculated the correct meta data allocation required. The |
| 1198 | * internal tree allocation code should know how to increase |
| 1199 | * transaction credits itself. |
| 1200 | * |
| 1201 | * If need be, we could handle -EAGAIN for a |
| 1202 | * RESTART_TRANS here. |
| 1203 | */ |
| 1204 | mlog_bug_on_msg(ret == -EAGAIN, |
| 1205 | "Inode %llu: EAGAIN return during allocation.\n", |
| 1206 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| 1207 | if (ret < 0) { |
| 1208 | mlog_errno(ret); |
| 1209 | goto out; |
| 1210 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1211 | } else if (unwritten) { |
Joel Becker | 5e404e9 | 2009-02-13 03:54:22 -0800 | [diff] [blame] | 1212 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
| 1213 | wc->w_di_bh); |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1214 | ret = ocfs2_mark_extent_written(inode, &et, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1215 | wc->w_handle, cpos, 1, phys, |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1216 | meta_ac, &wc->w_dealloc); |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1217 | if (ret < 0) { |
| 1218 | mlog_errno(ret); |
| 1219 | goto out; |
| 1220 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1221 | } |
| 1222 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1223 | if (should_zero) |
| 1224 | v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
| 1225 | else |
| 1226 | v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
| 1227 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1228 | /* |
| 1229 | * The only reason this should fail is due to an inability to |
| 1230 | * find the extent added. |
| 1231 | */ |
Mark Fasheh | 49cb8d2 | 2007-03-09 16:21:46 -0800 | [diff] [blame] | 1232 | ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, |
| 1233 | NULL); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1234 | if (ret < 0) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1235 | ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " |
| 1236 | "at logical block %llu", |
| 1237 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1238 | (unsigned long long)v_blkno); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1239 | goto out; |
| 1240 | } |
| 1241 | |
| 1242 | BUG_ON(p_blkno == 0); |
| 1243 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1244 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1245 | int tmpret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1246 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1247 | tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, |
| 1248 | wc->w_pages[i], cpos, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1249 | user_pos, user_len, |
| 1250 | should_zero); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1251 | if (tmpret) { |
| 1252 | mlog_errno(tmpret); |
| 1253 | if (ret == 0) |
Wengang Wang | cbfa963 | 2009-07-13 11:38:23 +0800 | [diff] [blame] | 1254 | ret = tmpret; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1255 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1256 | } |
| 1257 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1258 | /* |
| 1259 | * We only have cleanup to do in case of allocating write. |
| 1260 | */ |
| 1261 | if (ret && new) |
| 1262 | ocfs2_write_failure(inode, wc, user_pos, user_len); |
| 1263 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1264 | out: |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1265 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1266 | return ret; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1267 | } |
| 1268 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1269 | static int ocfs2_write_cluster_by_desc(struct address_space *mapping, |
| 1270 | struct ocfs2_alloc_context *data_ac, |
| 1271 | struct ocfs2_alloc_context *meta_ac, |
| 1272 | struct ocfs2_write_ctxt *wc, |
| 1273 | loff_t pos, unsigned len) |
| 1274 | { |
| 1275 | int ret, i; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1276 | loff_t cluster_off; |
| 1277 | unsigned int local_len = len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1278 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1279 | struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1280 | |
| 1281 | for (i = 0; i < wc->w_clen; i++) { |
| 1282 | desc = &wc->w_desc[i]; |
| 1283 | |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1284 | /* |
| 1285 | * We have to make sure that the total write passed in |
| 1286 | * doesn't extend past a single cluster. |
| 1287 | */ |
| 1288 | local_len = len; |
| 1289 | cluster_off = pos & (osb->s_clustersize - 1); |
| 1290 | if ((cluster_off + local_len) > osb->s_clustersize) |
| 1291 | local_len = osb->s_clustersize - cluster_off; |
| 1292 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1293 | ret = ocfs2_write_cluster(mapping, desc->c_phys, |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1294 | desc->c_unwritten, |
| 1295 | desc->c_needs_zero, |
| 1296 | data_ac, meta_ac, |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1297 | wc, desc->c_cpos, pos, local_len); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1298 | if (ret) { |
| 1299 | mlog_errno(ret); |
| 1300 | goto out; |
| 1301 | } |
Mark Fasheh | db56246 | 2007-09-17 09:06:29 -0700 | [diff] [blame] | 1302 | |
| 1303 | len -= local_len; |
| 1304 | pos += local_len; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1305 | } |
| 1306 | |
| 1307 | ret = 0; |
| 1308 | out: |
| 1309 | return ret; |
| 1310 | } |
| 1311 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1312 | /* |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1313 | * ocfs2_write_end() wants to know which parts of the target page it |
| 1314 | * should complete the write on. It's easiest to compute them ahead of |
| 1315 | * time when a more complete view of the write is available. |
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 | static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, |
| 1318 | struct ocfs2_write_ctxt *wc, |
| 1319 | loff_t pos, unsigned len, int alloc) |
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 | struct ocfs2_write_cluster_desc *desc; |
| 1322 | |
| 1323 | wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1); |
| 1324 | wc->w_target_to = wc->w_target_from + len; |
| 1325 | |
| 1326 | if (alloc == 0) |
| 1327 | return; |
| 1328 | |
| 1329 | /* |
| 1330 | * Allocating write - we may have different boundaries based |
| 1331 | * on page size and cluster size. |
| 1332 | * |
| 1333 | * NOTE: We can no longer compute one value from the other as |
| 1334 | * the actual write length and user provided length may be |
| 1335 | * different. |
| 1336 | */ |
| 1337 | |
| 1338 | if (wc->w_large_pages) { |
| 1339 | /* |
| 1340 | * We only care about the 1st and last cluster within |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1341 | * our range and whether they should be zero'd or not. Either |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1342 | * value may be extended out to the start/end of a |
| 1343 | * newly allocated cluster. |
| 1344 | */ |
| 1345 | desc = &wc->w_desc[0]; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1346 | if (desc->c_needs_zero) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1347 | ocfs2_figure_cluster_boundaries(osb, |
| 1348 | desc->c_cpos, |
| 1349 | &wc->w_target_from, |
| 1350 | NULL); |
| 1351 | |
| 1352 | desc = &wc->w_desc[wc->w_clen - 1]; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1353 | if (desc->c_needs_zero) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1354 | ocfs2_figure_cluster_boundaries(osb, |
| 1355 | desc->c_cpos, |
| 1356 | NULL, |
| 1357 | &wc->w_target_to); |
| 1358 | } else { |
| 1359 | wc->w_target_from = 0; |
| 1360 | wc->w_target_to = PAGE_CACHE_SIZE; |
| 1361 | } |
| 1362 | } |
| 1363 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1364 | /* |
| 1365 | * Populate each single-cluster write descriptor in the write context |
| 1366 | * with information about the i/o to be done. |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1367 | * |
| 1368 | * Returns the number of clusters that will have to be allocated, as |
| 1369 | * well as a worst case estimate of the number of extent records that |
| 1370 | * would have to be created during a write to an unwritten region. |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1371 | */ |
| 1372 | static int ocfs2_populate_write_desc(struct inode *inode, |
| 1373 | struct ocfs2_write_ctxt *wc, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1374 | unsigned int *clusters_to_alloc, |
| 1375 | unsigned int *extents_to_split) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1376 | { |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1377 | int ret; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1378 | struct ocfs2_write_cluster_desc *desc; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1379 | unsigned int num_clusters = 0; |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1380 | unsigned int ext_flags = 0; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1381 | u32 phys = 0; |
| 1382 | int i; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1383 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1384 | *clusters_to_alloc = 0; |
| 1385 | *extents_to_split = 0; |
| 1386 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1387 | for (i = 0; i < wc->w_clen; i++) { |
| 1388 | desc = &wc->w_desc[i]; |
| 1389 | desc->c_cpos = wc->w_cpos + i; |
| 1390 | |
| 1391 | if (num_clusters == 0) { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1392 | /* |
| 1393 | * Need to look up the next extent record. |
| 1394 | */ |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1395 | ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1396 | &num_clusters, &ext_flags); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1397 | if (ret) { |
| 1398 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1399 | goto out; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1400 | } |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1401 | |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 1402 | /* We should already CoW the refcountd extent. */ |
| 1403 | BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); |
| 1404 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1405 | /* |
| 1406 | * Assume worst case - that we're writing in |
| 1407 | * the middle of the extent. |
| 1408 | * |
| 1409 | * We can assume that the write proceeds from |
| 1410 | * left to right, in which case the extent |
| 1411 | * insert code is smart enough to coalesce the |
| 1412 | * next splits into the previous records created. |
| 1413 | */ |
| 1414 | if (ext_flags & OCFS2_EXT_UNWRITTEN) |
| 1415 | *extents_to_split = *extents_to_split + 2; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1416 | } else if (phys) { |
| 1417 | /* |
| 1418 | * Only increment phys if it doesn't describe |
| 1419 | * a hole. |
| 1420 | */ |
| 1421 | phys++; |
| 1422 | } |
| 1423 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1424 | /* |
| 1425 | * If w_first_new_cpos is < UINT_MAX, we have a non-sparse |
| 1426 | * file that got extended. w_first_new_cpos tells us |
| 1427 | * where the newly allocated clusters are so we can |
| 1428 | * zero them. |
| 1429 | */ |
| 1430 | if (desc->c_cpos >= wc->w_first_new_cpos) { |
| 1431 | BUG_ON(phys == 0); |
| 1432 | desc->c_needs_zero = 1; |
| 1433 | } |
| 1434 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1435 | desc->c_phys = phys; |
| 1436 | if (phys == 0) { |
| 1437 | desc->c_new = 1; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1438 | desc->c_needs_zero = 1; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1439 | *clusters_to_alloc = *clusters_to_alloc + 1; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1440 | } |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1441 | |
| 1442 | if (ext_flags & OCFS2_EXT_UNWRITTEN) { |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1443 | desc->c_unwritten = 1; |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1444 | desc->c_needs_zero = 1; |
| 1445 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1446 | |
| 1447 | num_clusters--; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1448 | } |
| 1449 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1450 | ret = 0; |
| 1451 | out: |
| 1452 | return ret; |
| 1453 | } |
| 1454 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1455 | static int ocfs2_write_begin_inline(struct address_space *mapping, |
| 1456 | struct inode *inode, |
| 1457 | struct ocfs2_write_ctxt *wc) |
| 1458 | { |
| 1459 | int ret; |
| 1460 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1461 | struct page *page; |
| 1462 | handle_t *handle; |
| 1463 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1464 | |
| 1465 | page = find_or_create_page(mapping, 0, GFP_NOFS); |
| 1466 | if (!page) { |
| 1467 | ret = -ENOMEM; |
| 1468 | mlog_errno(ret); |
| 1469 | goto out; |
| 1470 | } |
| 1471 | /* |
| 1472 | * If we don't set w_num_pages then this page won't get unlocked |
| 1473 | * and freed on cleanup of the write context. |
| 1474 | */ |
| 1475 | wc->w_pages[0] = wc->w_target_page = page; |
| 1476 | wc->w_num_pages = 1; |
| 1477 | |
| 1478 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| 1479 | if (IS_ERR(handle)) { |
| 1480 | ret = PTR_ERR(handle); |
| 1481 | mlog_errno(ret); |
| 1482 | goto out; |
| 1483 | } |
| 1484 | |
Joel Becker | 0cf2f76 | 2009-02-12 16:41:25 -0800 | [diff] [blame] | 1485 | 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] | 1486 | OCFS2_JOURNAL_ACCESS_WRITE); |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1487 | if (ret) { |
| 1488 | ocfs2_commit_trans(osb, handle); |
| 1489 | |
| 1490 | mlog_errno(ret); |
| 1491 | goto out; |
| 1492 | } |
| 1493 | |
| 1494 | if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) |
| 1495 | ocfs2_set_inode_data_inline(inode, di); |
| 1496 | |
| 1497 | if (!PageUptodate(page)) { |
| 1498 | ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); |
| 1499 | if (ret) { |
| 1500 | ocfs2_commit_trans(osb, handle); |
| 1501 | |
| 1502 | goto out; |
| 1503 | } |
| 1504 | } |
| 1505 | |
| 1506 | wc->w_handle = handle; |
| 1507 | out: |
| 1508 | return ret; |
| 1509 | } |
| 1510 | |
| 1511 | int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) |
| 1512 | { |
| 1513 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| 1514 | |
Mark Fasheh | 0d8a4e0 | 2007-11-20 11:48:41 -0800 | [diff] [blame] | 1515 | if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1516 | return 1; |
| 1517 | return 0; |
| 1518 | } |
| 1519 | |
| 1520 | static int ocfs2_try_to_write_inline_data(struct address_space *mapping, |
| 1521 | struct inode *inode, loff_t pos, |
| 1522 | unsigned len, struct page *mmap_page, |
| 1523 | struct ocfs2_write_ctxt *wc) |
| 1524 | { |
| 1525 | int ret, written = 0; |
| 1526 | loff_t end = pos + len; |
| 1527 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
Tiger Yang | d9ae49d | 2009-03-05 11:06:15 +0800 | [diff] [blame] | 1528 | struct ocfs2_dinode *di = NULL; |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1529 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 1530 | trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, |
| 1531 | len, (unsigned long long)pos, |
| 1532 | oi->ip_dyn_features); |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1533 | |
| 1534 | /* |
| 1535 | * Handle inodes which already have inline data 1st. |
| 1536 | */ |
| 1537 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1538 | if (mmap_page == NULL && |
| 1539 | ocfs2_size_fits_inline_data(wc->w_di_bh, end)) |
| 1540 | goto do_inline_write; |
| 1541 | |
| 1542 | /* |
| 1543 | * The write won't fit - we have to give this inode an |
| 1544 | * inline extent list now. |
| 1545 | */ |
| 1546 | ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); |
| 1547 | if (ret) |
| 1548 | mlog_errno(ret); |
| 1549 | goto out; |
| 1550 | } |
| 1551 | |
| 1552 | /* |
| 1553 | * Check whether the inode can accept inline data. |
| 1554 | */ |
| 1555 | if (oi->ip_clusters != 0 || i_size_read(inode) != 0) |
| 1556 | return 0; |
| 1557 | |
| 1558 | /* |
| 1559 | * Check whether the write can fit. |
| 1560 | */ |
Tiger Yang | d9ae49d | 2009-03-05 11:06:15 +0800 | [diff] [blame] | 1561 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1562 | if (mmap_page || |
| 1563 | end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1564 | return 0; |
| 1565 | |
| 1566 | do_inline_write: |
| 1567 | ret = ocfs2_write_begin_inline(mapping, inode, wc); |
| 1568 | if (ret) { |
| 1569 | mlog_errno(ret); |
| 1570 | goto out; |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * This signals to the caller that the data can be written |
| 1575 | * inline. |
| 1576 | */ |
| 1577 | written = 1; |
| 1578 | out: |
| 1579 | return written ? written : ret; |
| 1580 | } |
| 1581 | |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1582 | /* |
| 1583 | * This function only does anything for file systems which can't |
| 1584 | * handle sparse files. |
| 1585 | * |
| 1586 | * What we want to do here is fill in any hole between the current end |
| 1587 | * of allocation and the end of our write. That way the rest of the |
| 1588 | * write path can treat it as an non-allocating write, which has no |
| 1589 | * special case code for sparse/nonsparse files. |
| 1590 | */ |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1591 | static int ocfs2_expand_nonsparse_inode(struct inode *inode, |
| 1592 | struct buffer_head *di_bh, |
| 1593 | loff_t pos, unsigned len, |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1594 | struct ocfs2_write_ctxt *wc) |
| 1595 | { |
| 1596 | int ret; |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1597 | loff_t newsize = pos + len; |
| 1598 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1599 | BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1600 | |
| 1601 | if (newsize <= i_size_read(inode)) |
| 1602 | return 0; |
| 1603 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1604 | ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1605 | if (ret) |
| 1606 | mlog_errno(ret); |
| 1607 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1608 | wc->w_first_new_cpos = |
| 1609 | ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); |
| 1610 | |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1611 | return ret; |
| 1612 | } |
| 1613 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1614 | static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh, |
| 1615 | loff_t pos) |
| 1616 | { |
| 1617 | int ret = 0; |
| 1618 | |
| 1619 | BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
| 1620 | if (pos > i_size_read(inode)) |
| 1621 | ret = ocfs2_zero_extend(inode, di_bh, pos); |
| 1622 | |
| 1623 | return ret; |
| 1624 | } |
| 1625 | |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1626 | /* |
| 1627 | * Try to flush truncate logs if we can free enough clusters from it. |
| 1628 | * As for return value, "< 0" means error, "0" no space and "1" means |
| 1629 | * we have freed enough spaces and let the caller try to allocate again. |
| 1630 | */ |
| 1631 | static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb, |
| 1632 | unsigned int needed) |
| 1633 | { |
| 1634 | tid_t target; |
| 1635 | int ret = 0; |
| 1636 | unsigned int truncated_clusters; |
| 1637 | |
| 1638 | mutex_lock(&osb->osb_tl_inode->i_mutex); |
| 1639 | truncated_clusters = osb->truncated_clusters; |
| 1640 | mutex_unlock(&osb->osb_tl_inode->i_mutex); |
| 1641 | |
| 1642 | /* |
| 1643 | * Check whether we can succeed in allocating if we free |
| 1644 | * the truncate log. |
| 1645 | */ |
| 1646 | if (truncated_clusters < needed) |
| 1647 | goto out; |
| 1648 | |
| 1649 | ret = ocfs2_flush_truncate_log(osb); |
| 1650 | if (ret) { |
| 1651 | mlog_errno(ret); |
| 1652 | goto out; |
| 1653 | } |
| 1654 | |
| 1655 | if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) { |
| 1656 | jbd2_log_wait_commit(osb->journal->j_journal, target); |
| 1657 | ret = 1; |
| 1658 | } |
| 1659 | out: |
| 1660 | return ret; |
| 1661 | } |
| 1662 | |
Tao Ma | 0378da0f | 2010-08-12 10:25:28 +0800 | [diff] [blame] | 1663 | int ocfs2_write_begin_nolock(struct file *filp, |
| 1664 | struct address_space *mapping, |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1665 | loff_t pos, unsigned len, unsigned flags, |
| 1666 | struct page **pagep, void **fsdata, |
| 1667 | struct buffer_head *di_bh, struct page *mmap_page) |
| 1668 | { |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1669 | int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1670 | unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1671 | struct ocfs2_write_ctxt *wc; |
| 1672 | struct inode *inode = mapping->host; |
| 1673 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1674 | struct ocfs2_dinode *di; |
| 1675 | struct ocfs2_alloc_context *data_ac = NULL; |
| 1676 | struct ocfs2_alloc_context *meta_ac = NULL; |
| 1677 | handle_t *handle; |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1678 | struct ocfs2_extent_tree et; |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1679 | int try_free = 1, ret1; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1680 | |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1681 | try_again: |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1682 | ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); |
| 1683 | if (ret) { |
| 1684 | mlog_errno(ret); |
| 1685 | return ret; |
| 1686 | } |
| 1687 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1688 | if (ocfs2_supports_inline_data(osb)) { |
| 1689 | ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, |
| 1690 | mmap_page, wc); |
| 1691 | if (ret == 1) { |
| 1692 | ret = 0; |
| 1693 | goto success; |
| 1694 | } |
| 1695 | if (ret < 0) { |
| 1696 | mlog_errno(ret); |
| 1697 | goto out; |
| 1698 | } |
| 1699 | } |
| 1700 | |
Joel Becker | 5693486 | 2010-07-01 15:13:31 -0700 | [diff] [blame] | 1701 | if (ocfs2_sparse_alloc(osb)) |
| 1702 | ret = ocfs2_zero_tail(inode, di_bh, pos); |
| 1703 | else |
| 1704 | ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len, |
| 1705 | wc); |
Mark Fasheh | 65ed39d | 2007-08-28 17:13:23 -0700 | [diff] [blame] | 1706 | if (ret) { |
| 1707 | mlog_errno(ret); |
| 1708 | goto out; |
| 1709 | } |
| 1710 | |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 1711 | ret = ocfs2_check_range_for_refcount(inode, pos, len); |
| 1712 | if (ret < 0) { |
| 1713 | mlog_errno(ret); |
| 1714 | goto out; |
| 1715 | } else if (ret == 1) { |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1716 | clusters_need = wc->w_clen; |
Tao Ma | 1550271 | 2010-08-12 10:36:38 +0800 | [diff] [blame] | 1717 | ret = ocfs2_refcount_cow(inode, filp, di_bh, |
Tao Ma | 37f8a2b | 2009-08-26 09:47:28 +0800 | [diff] [blame] | 1718 | wc->w_cpos, wc->w_clen, UINT_MAX); |
Tao Ma | 293b2f7 | 2009-08-25 08:02:48 +0800 | [diff] [blame] | 1719 | if (ret) { |
| 1720 | mlog_errno(ret); |
| 1721 | goto out; |
| 1722 | } |
| 1723 | } |
| 1724 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1725 | ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, |
| 1726 | &extents_to_split); |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1727 | if (ret) { |
| 1728 | mlog_errno(ret); |
| 1729 | goto out; |
| 1730 | } |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1731 | clusters_need += clusters_to_alloc; |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1732 | |
| 1733 | di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1734 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 1735 | trace_ocfs2_write_begin_nolock( |
| 1736 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| 1737 | (long long)i_size_read(inode), |
| 1738 | le32_to_cpu(di->i_clusters), |
| 1739 | pos, len, flags, mmap_page, |
| 1740 | clusters_to_alloc, extents_to_split); |
| 1741 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1742 | /* |
| 1743 | * We set w_target_from, w_target_to here so that |
| 1744 | * ocfs2_write_end() knows which range in the target page to |
| 1745 | * write out. An allocation requires that we write the entire |
| 1746 | * cluster range. |
| 1747 | */ |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1748 | if (clusters_to_alloc || extents_to_split) { |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1749 | /* |
| 1750 | * XXX: We are stretching the limits of |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 1751 | * ocfs2_lock_allocators(). It greatly over-estimates |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1752 | * the work to be done. |
| 1753 | */ |
Joel Becker | 5e404e9 | 2009-02-13 03:54:22 -0800 | [diff] [blame] | 1754 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), |
| 1755 | wc->w_di_bh); |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1756 | ret = ocfs2_lock_allocators(inode, &et, |
Tao Ma | 231b87d | 2008-08-18 17:38:42 +0800 | [diff] [blame] | 1757 | clusters_to_alloc, extents_to_split, |
Joel Becker | f99b9b7 | 2008-08-20 19:36:33 -0700 | [diff] [blame] | 1758 | &data_ac, &meta_ac); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1759 | if (ret) { |
| 1760 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1761 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1762 | } |
| 1763 | |
Mark Fasheh | 4fe370a | 2009-12-07 13:15:40 -0800 | [diff] [blame] | 1764 | if (data_ac) |
| 1765 | data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; |
| 1766 | |
Tao Ma | 811f933 | 2008-08-18 17:38:43 +0800 | [diff] [blame] | 1767 | credits = ocfs2_calc_extend_credits(inode->i_sb, |
| 1768 | &di->id2.i_list, |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1769 | clusters_to_alloc); |
| 1770 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1771 | } |
| 1772 | |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1773 | /* |
| 1774 | * We have to zero sparse allocated clusters, unwritten extent clusters, |
| 1775 | * and non-sparse clusters we just extended. For non-sparse writes, |
| 1776 | * we know zeros will only be needed in the first and/or last cluster. |
| 1777 | */ |
| 1778 | if (clusters_to_alloc || extents_to_split || |
Sunil Mushran | 8379e7c | 2009-09-04 11:12:01 -0700 | [diff] [blame] | 1779 | (wc->w_clen && (wc->w_desc[0].c_needs_zero || |
| 1780 | wc->w_desc[wc->w_clen - 1].c_needs_zero))) |
Sunil Mushran | e743267 | 2009-08-06 16:12:58 -0700 | [diff] [blame] | 1781 | cluster_of_pages = 1; |
| 1782 | else |
| 1783 | cluster_of_pages = 0; |
| 1784 | |
| 1785 | ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1786 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1787 | handle = ocfs2_start_trans(osb, credits); |
| 1788 | if (IS_ERR(handle)) { |
| 1789 | ret = PTR_ERR(handle); |
| 1790 | mlog_errno(ret); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1791 | goto out; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1792 | } |
| 1793 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1794 | wc->w_handle = handle; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1795 | |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 1796 | if (clusters_to_alloc) { |
| 1797 | ret = dquot_alloc_space_nodirty(inode, |
| 1798 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
| 1799 | if (ret) |
| 1800 | goto out_commit; |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1801 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1802 | /* |
| 1803 | * We don't want this to fail in ocfs2_write_end(), so do it |
| 1804 | * here. |
| 1805 | */ |
Joel Becker | 0cf2f76 | 2009-02-12 16:41:25 -0800 | [diff] [blame] | 1806 | 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] | 1807 | OCFS2_JOURNAL_ACCESS_WRITE); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1808 | if (ret) { |
| 1809 | mlog_errno(ret); |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1810 | goto out_quota; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1811 | } |
| 1812 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1813 | /* |
| 1814 | * Fill our page array first. That way we've grabbed enough so |
| 1815 | * that we can zero and flush if we error after adding the |
| 1816 | * extent. |
| 1817 | */ |
Joel Becker | 693c241 | 2010-07-02 17:20:27 -0700 | [diff] [blame] | 1818 | 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] | 1819 | cluster_of_pages, mmap_page); |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1820 | if (ret) { |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1821 | mlog_errno(ret); |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1822 | goto out_quota; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1823 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1824 | |
Mark Fasheh | 0d172ba | 2007-05-14 18:09:54 -0700 | [diff] [blame] | 1825 | ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, |
| 1826 | len); |
| 1827 | if (ret) { |
| 1828 | mlog_errno(ret); |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1829 | goto out_quota; |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1830 | } |
| 1831 | |
| 1832 | if (data_ac) |
| 1833 | ocfs2_free_alloc_context(data_ac); |
| 1834 | if (meta_ac) |
| 1835 | ocfs2_free_alloc_context(meta_ac); |
| 1836 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1837 | success: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1838 | *pagep = wc->w_target_page; |
| 1839 | *fsdata = wc; |
| 1840 | return 0; |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1841 | out_quota: |
| 1842 | if (clusters_to_alloc) |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 1843 | dquot_free_space(inode, |
Jan Kara | a90714c | 2008-10-09 19:38:40 +0200 | [diff] [blame] | 1844 | ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1845 | out_commit: |
| 1846 | ocfs2_commit_trans(osb, handle); |
| 1847 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1848 | out: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1849 | ocfs2_free_write_ctxt(wc); |
| 1850 | |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1851 | if (data_ac) |
| 1852 | ocfs2_free_alloc_context(data_ac); |
| 1853 | if (meta_ac) |
| 1854 | ocfs2_free_alloc_context(meta_ac); |
Tao Ma | 50308d8 | 2010-11-04 15:14:11 +0800 | [diff] [blame] | 1855 | |
| 1856 | if (ret == -ENOSPC && try_free) { |
| 1857 | /* |
| 1858 | * Try to free some truncate log so that we can have enough |
| 1859 | * clusters to allocate. |
| 1860 | */ |
| 1861 | try_free = 0; |
| 1862 | |
| 1863 | ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need); |
| 1864 | if (ret1 == 1) |
| 1865 | goto try_again; |
| 1866 | |
| 1867 | if (ret1 < 0) |
| 1868 | mlog_errno(ret1); |
| 1869 | } |
| 1870 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1871 | return ret; |
| 1872 | } |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 1873 | |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 1874 | static int ocfs2_write_begin(struct file *file, struct address_space *mapping, |
| 1875 | loff_t pos, unsigned len, unsigned flags, |
| 1876 | struct page **pagep, void **fsdata) |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1877 | { |
| 1878 | int ret; |
| 1879 | struct buffer_head *di_bh = NULL; |
| 1880 | struct inode *inode = mapping->host; |
| 1881 | |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 1882 | ret = ocfs2_inode_lock(inode, &di_bh, 1); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1883 | if (ret) { |
| 1884 | mlog_errno(ret); |
| 1885 | return ret; |
| 1886 | } |
| 1887 | |
| 1888 | /* |
| 1889 | * Take alloc sem here to prevent concurrent lookups. That way |
| 1890 | * the mapping, zeroing and tree manipulation within |
| 1891 | * ocfs2_write() will be safe against ->readpage(). This |
| 1892 | * should also serve to lock out allocation from a shared |
| 1893 | * writeable region. |
| 1894 | */ |
| 1895 | down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1896 | |
Tao Ma | 0378da0f | 2010-08-12 10:25:28 +0800 | [diff] [blame] | 1897 | ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep, |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1898 | fsdata, di_bh, NULL); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1899 | if (ret) { |
| 1900 | mlog_errno(ret); |
Mark Fasheh | c934a92 | 2007-10-18 15:23:46 -0700 | [diff] [blame] | 1901 | goto out_fail; |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1902 | } |
| 1903 | |
| 1904 | brelse(di_bh); |
| 1905 | |
| 1906 | return 0; |
| 1907 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1908 | out_fail: |
| 1909 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| 1910 | |
| 1911 | brelse(di_bh); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 1912 | ocfs2_inode_unlock(inode, 1); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 1913 | |
| 1914 | return ret; |
| 1915 | } |
| 1916 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1917 | static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, |
| 1918 | unsigned len, unsigned *copied, |
| 1919 | struct ocfs2_dinode *di, |
| 1920 | struct ocfs2_write_ctxt *wc) |
| 1921 | { |
| 1922 | void *kaddr; |
| 1923 | |
| 1924 | if (unlikely(*copied < len)) { |
| 1925 | if (!PageUptodate(wc->w_target_page)) { |
| 1926 | *copied = 0; |
| 1927 | return; |
| 1928 | } |
| 1929 | } |
| 1930 | |
| 1931 | kaddr = kmap_atomic(wc->w_target_page, KM_USER0); |
| 1932 | memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); |
| 1933 | kunmap_atomic(kaddr, KM_USER0); |
| 1934 | |
Tao Ma | 9558156 | 2011-02-22 21:33:59 +0800 | [diff] [blame] | 1935 | trace_ocfs2_write_end_inline( |
| 1936 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1937 | (unsigned long long)pos, *copied, |
| 1938 | le16_to_cpu(di->id2.i_data.id_count), |
| 1939 | le16_to_cpu(di->i_dyn_features)); |
| 1940 | } |
| 1941 | |
Mark Fasheh | 7307de8 | 2007-05-09 15:16:19 -0700 | [diff] [blame] | 1942 | int ocfs2_write_end_nolock(struct address_space *mapping, |
| 1943 | loff_t pos, unsigned len, unsigned copied, |
| 1944 | struct page *page, void *fsdata) |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1945 | { |
| 1946 | int i; |
| 1947 | unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1); |
| 1948 | struct inode *inode = mapping->host; |
| 1949 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1950 | struct ocfs2_write_ctxt *wc = fsdata; |
| 1951 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
| 1952 | handle_t *handle = wc->w_handle; |
| 1953 | struct page *tmppage; |
| 1954 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1955 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| 1956 | ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); |
| 1957 | goto out_write_size; |
| 1958 | } |
| 1959 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1960 | if (unlikely(copied < len)) { |
| 1961 | if (!PageUptodate(wc->w_target_page)) |
| 1962 | copied = 0; |
| 1963 | |
| 1964 | ocfs2_zero_new_buffers(wc->w_target_page, start+copied, |
| 1965 | start+len); |
| 1966 | } |
| 1967 | flush_dcache_page(wc->w_target_page); |
| 1968 | |
| 1969 | for(i = 0; i < wc->w_num_pages; i++) { |
| 1970 | tmppage = wc->w_pages[i]; |
| 1971 | |
| 1972 | if (tmppage == wc->w_target_page) { |
| 1973 | from = wc->w_target_from; |
| 1974 | to = wc->w_target_to; |
| 1975 | |
| 1976 | BUG_ON(from > PAGE_CACHE_SIZE || |
| 1977 | to > PAGE_CACHE_SIZE || |
| 1978 | to < from); |
| 1979 | } else { |
| 1980 | /* |
| 1981 | * Pages adjacent to the target (if any) imply |
| 1982 | * a hole-filling write in which case we want |
| 1983 | * to flush their entire range. |
| 1984 | */ |
| 1985 | from = 0; |
| 1986 | to = PAGE_CACHE_SIZE; |
| 1987 | } |
| 1988 | |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 1989 | if (page_has_buffers(tmppage)) { |
Mark Fasheh | 53ef99c | 2008-11-18 16:53:43 -0800 | [diff] [blame] | 1990 | if (ocfs2_should_order_data(inode)) |
Joel Becker | 2b4e30f | 2008-09-03 20:03:41 -0700 | [diff] [blame] | 1991 | ocfs2_jbd2_file_inode(wc->w_handle, inode); |
Sunil Mushran | 961cecb | 2008-07-16 17:22:22 -0700 | [diff] [blame] | 1992 | block_commit_write(tmppage, from, to); |
| 1993 | } |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1994 | } |
| 1995 | |
Mark Fasheh | 1afc32b | 2007-09-07 14:46:51 -0700 | [diff] [blame] | 1996 | out_write_size: |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 1997 | pos += copied; |
| 1998 | if (pos > inode->i_size) { |
| 1999 | i_size_write(inode, pos); |
| 2000 | mark_inode_dirty(inode); |
| 2001 | } |
| 2002 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
| 2003 | di->i_size = cpu_to_le64((u64)i_size_read(inode)); |
| 2004 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 2005 | di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); |
| 2006 | 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] | 2007 | ocfs2_journal_dirty(handle, wc->w_di_bh); |
| 2008 | |
| 2009 | ocfs2_commit_trans(osb, handle); |
Mark Fasheh | 59a5e41 | 2007-06-22 15:52:36 -0700 | [diff] [blame] | 2010 | |
Mark Fasheh | b27b7cb | 2007-06-18 11:22:56 -0700 | [diff] [blame] | 2011 | ocfs2_run_deallocs(osb, &wc->w_dealloc); |
| 2012 | |
Mark Fasheh | 3a307ff | 2007-05-08 17:47:32 -0700 | [diff] [blame] | 2013 | ocfs2_free_write_ctxt(wc); |
| 2014 | |
| 2015 | return copied; |
Mark Fasheh | 9517bac | 2007-02-09 20:24:12 -0800 | [diff] [blame] | 2016 | } |
| 2017 | |
Nick Piggin | b6af1bc | 2007-10-16 01:25:24 -0700 | [diff] [blame] | 2018 | static int ocfs2_write_end(struct file *file, struct address_space *mapping, |
| 2019 | loff_t pos, unsigned len, unsigned copied, |
| 2020 | struct page *page, void *fsdata) |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 2021 | { |
| 2022 | int ret; |
| 2023 | struct inode *inode = mapping->host; |
| 2024 | |
| 2025 | ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); |
| 2026 | |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 2027 | up_write(&OCFS2_I(inode)->ip_alloc_sem); |
Mark Fasheh | e63aecb6 | 2007-10-18 15:30:42 -0700 | [diff] [blame] | 2028 | ocfs2_inode_unlock(inode, 1); |
Mark Fasheh | 607d44a | 2007-05-09 15:14:45 -0700 | [diff] [blame] | 2029 | |
| 2030 | return ret; |
| 2031 | } |
| 2032 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2033 | const struct address_space_operations ocfs2_aops = { |
Hisashi Hifumi | 1fca3a0 | 2009-03-05 17:22:21 +0900 | [diff] [blame] | 2034 | .readpage = ocfs2_readpage, |
| 2035 | .readpages = ocfs2_readpages, |
| 2036 | .writepage = ocfs2_writepage, |
| 2037 | .write_begin = ocfs2_write_begin, |
| 2038 | .write_end = ocfs2_write_end, |
| 2039 | .bmap = ocfs2_bmap, |
Hisashi Hifumi | 1fca3a0 | 2009-03-05 17:22:21 +0900 | [diff] [blame] | 2040 | .direct_IO = ocfs2_direct_IO, |
| 2041 | .invalidatepage = ocfs2_invalidatepage, |
| 2042 | .releasepage = ocfs2_releasepage, |
| 2043 | .migratepage = buffer_migrate_page, |
| 2044 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 2045 | .error_remove_page = generic_error_remove_page, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2046 | }; |