1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * Portions Copyright (C) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/fs.h> 21 #include <linux/mpage.h> 22 #include <linux/buffer_head.h> 23 #include <linux/pagemap.h> 24 #include <linux/quotaops.h> 25 #include "jfs_incore.h" 26 #include "jfs_inode.h" 27 #include "jfs_filsys.h" 28 #include "jfs_imap.h" 29 #include "jfs_extent.h" 30 #include "jfs_unicode.h" 31 #include "jfs_debug.h" 32 33 34 void jfs_read_inode(struct inode *inode) 35 { 36 if (diRead(inode)) { 37 make_bad_inode(inode); 38 return; 39 } 40 41 if (S_ISREG(inode->i_mode)) { 42 inode->i_op = &jfs_file_inode_operations; 43 inode->i_fop = &jfs_file_operations; 44 inode->i_mapping->a_ops = &jfs_aops; 45 } else if (S_ISDIR(inode->i_mode)) { 46 inode->i_op = &jfs_dir_inode_operations; 47 inode->i_fop = &jfs_dir_operations; 48 } else if (S_ISLNK(inode->i_mode)) { 49 if (inode->i_size >= IDATASIZE) { 50 inode->i_op = &page_symlink_inode_operations; 51 inode->i_mapping->a_ops = &jfs_aops; 52 } else 53 inode->i_op = &jfs_symlink_inode_operations; 54 } else { 55 inode->i_op = &jfs_file_inode_operations; 56 init_special_inode(inode, inode->i_mode, inode->i_rdev); 57 } 58 jfs_set_inode_flags(inode); 59 } 60 61 /* 62 * Workhorse of both fsync & write_inode 63 */ 64 int jfs_commit_inode(struct inode *inode, int wait) 65 { 66 int rc = 0; 67 tid_t tid; 68 static int noisy = 5; 69 70 jfs_info("In jfs_commit_inode, inode = 0x%p", inode); 71 72 /* 73 * Don't commit if inode has been committed since last being 74 * marked dirty, or if it has been deleted. 75 */ 76 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) 77 return 0; 78 79 if (isReadOnly(inode)) { 80 /* kernel allows writes to devices on read-only 81 * partitions and may think inode is dirty 82 */ 83 if (!special_file(inode->i_mode) && noisy) { 84 jfs_err("jfs_commit_inode(0x%p) called on " 85 "read-only volume", inode); 86 jfs_err("Is remount racy?"); 87 noisy--; 88 } 89 return 0; 90 } 91 92 tid = txBegin(inode->i_sb, COMMIT_INODE); 93 mutex_lock(&JFS_IP(inode)->commit_mutex); 94 95 /* 96 * Retest inode state after taking commit_mutex 97 */ 98 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) 99 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); 100 101 txEnd(tid); 102 mutex_unlock(&JFS_IP(inode)->commit_mutex); 103 return rc; 104 } 105 106 int jfs_write_inode(struct inode *inode, int wait) 107 { 108 if (test_cflag(COMMIT_Nolink, inode)) 109 return 0; 110 /* 111 * If COMMIT_DIRTY is not set, the inode isn't really dirty. 112 * It has been committed since the last change, but was still 113 * on the dirty inode list. 114 */ 115 if (!test_cflag(COMMIT_Dirty, inode)) { 116 /* Make sure committed changes hit the disk */ 117 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); 118 return 0; 119 } 120 121 if (jfs_commit_inode(inode, wait)) { 122 jfs_err("jfs_write_inode: jfs_commit_inode failed!"); 123 return -EIO; 124 } else 125 return 0; 126 } 127 128 void jfs_delete_inode(struct inode *inode) 129 { 130 jfs_info("In jfs_delete_inode, inode = 0x%p", inode); 131 132 if (!is_bad_inode(inode) && 133 (JFS_IP(inode)->fileset == FILESYSTEM_I)) { 134 truncate_inode_pages(&inode->i_data, 0); 135 136 if (test_cflag(COMMIT_Freewmap, inode)) 137 jfs_free_zero_link(inode); 138 139 diFree(inode); 140 141 /* 142 * Free the inode from the quota allocation. 143 */ 144 DQUOT_INIT(inode); 145 DQUOT_FREE_INODE(inode); 146 DQUOT_DROP(inode); 147 } 148 149 clear_inode(inode); 150 } 151 152 void jfs_dirty_inode(struct inode *inode) 153 { 154 static int noisy = 5; 155 156 if (isReadOnly(inode)) { 157 if (!special_file(inode->i_mode) && noisy) { 158 /* kernel allows writes to devices on read-only 159 * partitions and may try to mark inode dirty 160 */ 161 jfs_err("jfs_dirty_inode called on read-only volume"); 162 jfs_err("Is remount racy?"); 163 noisy--; 164 } 165 return; 166 } 167 168 set_cflag(COMMIT_Dirty, inode); 169 } 170 171 static int 172 jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks, 173 struct buffer_head *bh_result, int create) 174 { 175 s64 lblock64 = lblock; 176 int rc = 0; 177 xad_t xad; 178 s64 xaddr; 179 int xflag; 180 s32 xlen = max_blocks; 181 182 /* 183 * Take appropriate lock on inode 184 */ 185 if (create) 186 IWRITE_LOCK(ip); 187 else 188 IREAD_LOCK(ip); 189 190 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && 191 (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) && 192 xaddr) { 193 if (xflag & XAD_NOTRECORDED) { 194 if (!create) 195 /* 196 * Allocated but not recorded, read treats 197 * this as a hole 198 */ 199 goto unlock; 200 #ifdef _JFS_4K 201 XADoffset(&xad, lblock64); 202 XADlength(&xad, xlen); 203 XADaddress(&xad, xaddr); 204 #else /* _JFS_4K */ 205 /* 206 * As long as block size = 4K, this isn't a problem. 207 * We should mark the whole page not ABNR, but how 208 * will we know to mark the other blocks BH_New? 209 */ 210 BUG(); 211 #endif /* _JFS_4K */ 212 rc = extRecord(ip, &xad); 213 if (rc) 214 goto unlock; 215 set_buffer_new(bh_result); 216 } 217 218 map_bh(bh_result, ip->i_sb, xaddr); 219 bh_result->b_size = xlen << ip->i_blkbits; 220 goto unlock; 221 } 222 if (!create) 223 goto unlock; 224 225 /* 226 * Allocate a new block 227 */ 228 #ifdef _JFS_4K 229 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) 230 goto unlock; 231 rc = extAlloc(ip, xlen, lblock64, &xad, FALSE); 232 if (rc) 233 goto unlock; 234 235 set_buffer_new(bh_result); 236 map_bh(bh_result, ip->i_sb, addressXAD(&xad)); 237 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; 238 239 #else /* _JFS_4K */ 240 /* 241 * We need to do whatever it takes to keep all but the last buffers 242 * in 4K pages - see jfs_write.c 243 */ 244 BUG(); 245 #endif /* _JFS_4K */ 246 247 unlock: 248 /* 249 * Release lock on inode 250 */ 251 if (create) 252 IWRITE_UNLOCK(ip); 253 else 254 IREAD_UNLOCK(ip); 255 return rc; 256 } 257 258 static int jfs_get_block(struct inode *ip, sector_t lblock, 259 struct buffer_head *bh_result, int create) 260 { 261 return jfs_get_blocks(ip, lblock, bh_result->b_size >> ip->i_blkbits, 262 bh_result, create); 263 } 264 265 static int jfs_writepage(struct page *page, struct writeback_control *wbc) 266 { 267 return nobh_writepage(page, jfs_get_block, wbc); 268 } 269 270 static int jfs_writepages(struct address_space *mapping, 271 struct writeback_control *wbc) 272 { 273 return mpage_writepages(mapping, wbc, jfs_get_block); 274 } 275 276 static int jfs_readpage(struct file *file, struct page *page) 277 { 278 return mpage_readpage(page, jfs_get_block); 279 } 280 281 static int jfs_readpages(struct file *file, struct address_space *mapping, 282 struct list_head *pages, unsigned nr_pages) 283 { 284 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); 285 } 286 287 static int jfs_prepare_write(struct file *file, 288 struct page *page, unsigned from, unsigned to) 289 { 290 return nobh_prepare_write(page, from, to, jfs_get_block); 291 } 292 293 static sector_t jfs_bmap(struct address_space *mapping, sector_t block) 294 { 295 return generic_block_bmap(mapping, block, jfs_get_block); 296 } 297 298 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, 299 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 300 { 301 struct file *file = iocb->ki_filp; 302 struct inode *inode = file->f_mapping->host; 303 304 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 305 offset, nr_segs, jfs_get_block, NULL); 306 } 307 308 const struct address_space_operations jfs_aops = { 309 .readpage = jfs_readpage, 310 .readpages = jfs_readpages, 311 .writepage = jfs_writepage, 312 .writepages = jfs_writepages, 313 .sync_page = block_sync_page, 314 .prepare_write = jfs_prepare_write, 315 .commit_write = nobh_commit_write, 316 .bmap = jfs_bmap, 317 .direct_IO = jfs_direct_IO, 318 }; 319 320 /* 321 * Guts of jfs_truncate. Called with locks already held. Can be called 322 * with directory for truncating directory index table. 323 */ 324 void jfs_truncate_nolock(struct inode *ip, loff_t length) 325 { 326 loff_t newsize; 327 tid_t tid; 328 329 ASSERT(length >= 0); 330 331 if (test_cflag(COMMIT_Nolink, ip)) { 332 xtTruncate(0, ip, length, COMMIT_WMAP); 333 return; 334 } 335 336 do { 337 tid = txBegin(ip->i_sb, 0); 338 339 /* 340 * The commit_mutex cannot be taken before txBegin. 341 * txBegin may block and there is a chance the inode 342 * could be marked dirty and need to be committed 343 * before txBegin unblocks 344 */ 345 mutex_lock(&JFS_IP(ip)->commit_mutex); 346 347 newsize = xtTruncate(tid, ip, length, 348 COMMIT_TRUNCATE | COMMIT_PWMAP); 349 if (newsize < 0) { 350 txEnd(tid); 351 mutex_unlock(&JFS_IP(ip)->commit_mutex); 352 break; 353 } 354 355 ip->i_mtime = ip->i_ctime = CURRENT_TIME; 356 mark_inode_dirty(ip); 357 358 txCommit(tid, 1, &ip, 0); 359 txEnd(tid); 360 mutex_unlock(&JFS_IP(ip)->commit_mutex); 361 } while (newsize > length); /* Truncate isn't always atomic */ 362 } 363 364 void jfs_truncate(struct inode *ip) 365 { 366 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); 367 368 nobh_truncate_page(ip->i_mapping, ip->i_size); 369 370 IWRITE_LOCK(ip); 371 jfs_truncate_nolock(ip, ip->i_size); 372 IWRITE_UNLOCK(ip); 373 } 374