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 <linux/writeback.h> 26 #include "jfs_incore.h" 27 #include "jfs_inode.h" 28 #include "jfs_filsys.h" 29 #include "jfs_imap.h" 30 #include "jfs_extent.h" 31 #include "jfs_unicode.h" 32 #include "jfs_debug.h" 33 34 35 struct inode *jfs_iget(struct super_block *sb, unsigned long ino) 36 { 37 struct inode *inode; 38 int ret; 39 40 inode = iget_locked(sb, ino); 41 if (!inode) 42 return ERR_PTR(-ENOMEM); 43 if (!(inode->i_state & I_NEW)) 44 return inode; 45 46 ret = diRead(inode); 47 if (ret < 0) { 48 iget_failed(inode); 49 return ERR_PTR(ret); 50 } 51 52 if (S_ISREG(inode->i_mode)) { 53 inode->i_op = &jfs_file_inode_operations; 54 inode->i_fop = &jfs_file_operations; 55 inode->i_mapping->a_ops = &jfs_aops; 56 } else if (S_ISDIR(inode->i_mode)) { 57 inode->i_op = &jfs_dir_inode_operations; 58 inode->i_fop = &jfs_dir_operations; 59 } else if (S_ISLNK(inode->i_mode)) { 60 if (inode->i_size >= IDATASIZE) { 61 inode->i_op = &page_symlink_inode_operations; 62 inode->i_mapping->a_ops = &jfs_aops; 63 } else { 64 inode->i_op = &jfs_fast_symlink_inode_operations; 65 /* 66 * The inline data should be null-terminated, but 67 * don't let on-disk corruption crash the kernel 68 */ 69 JFS_IP(inode)->i_inline[inode->i_size] = '\0'; 70 } 71 } else { 72 inode->i_op = &jfs_file_inode_operations; 73 init_special_inode(inode, inode->i_mode, inode->i_rdev); 74 } 75 unlock_new_inode(inode); 76 return inode; 77 } 78 79 /* 80 * Workhorse of both fsync & write_inode 81 */ 82 int jfs_commit_inode(struct inode *inode, int wait) 83 { 84 int rc = 0; 85 tid_t tid; 86 static int noisy = 5; 87 88 jfs_info("In jfs_commit_inode, inode = 0x%p", inode); 89 90 /* 91 * Don't commit if inode has been committed since last being 92 * marked dirty, or if it has been deleted. 93 */ 94 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) 95 return 0; 96 97 if (isReadOnly(inode)) { 98 /* kernel allows writes to devices on read-only 99 * partitions and may think inode is dirty 100 */ 101 if (!special_file(inode->i_mode) && noisy) { 102 jfs_err("jfs_commit_inode(0x%p) called on " 103 "read-only volume", inode); 104 jfs_err("Is remount racy?"); 105 noisy--; 106 } 107 return 0; 108 } 109 110 tid = txBegin(inode->i_sb, COMMIT_INODE); 111 mutex_lock(&JFS_IP(inode)->commit_mutex); 112 113 /* 114 * Retest inode state after taking commit_mutex 115 */ 116 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) 117 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); 118 119 txEnd(tid); 120 mutex_unlock(&JFS_IP(inode)->commit_mutex); 121 return rc; 122 } 123 124 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) 125 { 126 int wait = wbc->sync_mode == WB_SYNC_ALL; 127 128 if (test_cflag(COMMIT_Nolink, inode)) 129 return 0; 130 /* 131 * If COMMIT_DIRTY is not set, the inode isn't really dirty. 132 * It has been committed since the last change, but was still 133 * on the dirty inode list. 134 */ 135 if (!test_cflag(COMMIT_Dirty, inode)) { 136 /* Make sure committed changes hit the disk */ 137 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); 138 return 0; 139 } 140 141 if (jfs_commit_inode(inode, wait)) { 142 jfs_err("jfs_write_inode: jfs_commit_inode failed!"); 143 return -EIO; 144 } else 145 return 0; 146 } 147 148 void jfs_delete_inode(struct inode *inode) 149 { 150 jfs_info("In jfs_delete_inode, inode = 0x%p", inode); 151 152 if (!is_bad_inode(inode)) 153 dquot_initialize(inode); 154 155 if (!is_bad_inode(inode) && 156 (JFS_IP(inode)->fileset == FILESYSTEM_I)) { 157 truncate_inode_pages(&inode->i_data, 0); 158 159 if (test_cflag(COMMIT_Freewmap, inode)) 160 jfs_free_zero_link(inode); 161 162 diFree(inode); 163 164 /* 165 * Free the inode from the quota allocation. 166 */ 167 dquot_initialize(inode); 168 dquot_free_inode(inode); 169 dquot_drop(inode); 170 } 171 172 clear_inode(inode); 173 } 174 175 void jfs_dirty_inode(struct inode *inode) 176 { 177 static int noisy = 5; 178 179 if (isReadOnly(inode)) { 180 if (!special_file(inode->i_mode) && noisy) { 181 /* kernel allows writes to devices on read-only 182 * partitions and may try to mark inode dirty 183 */ 184 jfs_err("jfs_dirty_inode called on read-only volume"); 185 jfs_err("Is remount racy?"); 186 noisy--; 187 } 188 return; 189 } 190 191 set_cflag(COMMIT_Dirty, inode); 192 } 193 194 int jfs_get_block(struct inode *ip, sector_t lblock, 195 struct buffer_head *bh_result, int create) 196 { 197 s64 lblock64 = lblock; 198 int rc = 0; 199 xad_t xad; 200 s64 xaddr; 201 int xflag; 202 s32 xlen = bh_result->b_size >> ip->i_blkbits; 203 204 /* 205 * Take appropriate lock on inode 206 */ 207 if (create) 208 IWRITE_LOCK(ip, RDWRLOCK_NORMAL); 209 else 210 IREAD_LOCK(ip, RDWRLOCK_NORMAL); 211 212 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && 213 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && 214 xaddr) { 215 if (xflag & XAD_NOTRECORDED) { 216 if (!create) 217 /* 218 * Allocated but not recorded, read treats 219 * this as a hole 220 */ 221 goto unlock; 222 #ifdef _JFS_4K 223 XADoffset(&xad, lblock64); 224 XADlength(&xad, xlen); 225 XADaddress(&xad, xaddr); 226 #else /* _JFS_4K */ 227 /* 228 * As long as block size = 4K, this isn't a problem. 229 * We should mark the whole page not ABNR, but how 230 * will we know to mark the other blocks BH_New? 231 */ 232 BUG(); 233 #endif /* _JFS_4K */ 234 rc = extRecord(ip, &xad); 235 if (rc) 236 goto unlock; 237 set_buffer_new(bh_result); 238 } 239 240 map_bh(bh_result, ip->i_sb, xaddr); 241 bh_result->b_size = xlen << ip->i_blkbits; 242 goto unlock; 243 } 244 if (!create) 245 goto unlock; 246 247 /* 248 * Allocate a new block 249 */ 250 #ifdef _JFS_4K 251 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) 252 goto unlock; 253 rc = extAlloc(ip, xlen, lblock64, &xad, false); 254 if (rc) 255 goto unlock; 256 257 set_buffer_new(bh_result); 258 map_bh(bh_result, ip->i_sb, addressXAD(&xad)); 259 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; 260 261 #else /* _JFS_4K */ 262 /* 263 * We need to do whatever it takes to keep all but the last buffers 264 * in 4K pages - see jfs_write.c 265 */ 266 BUG(); 267 #endif /* _JFS_4K */ 268 269 unlock: 270 /* 271 * Release lock on inode 272 */ 273 if (create) 274 IWRITE_UNLOCK(ip); 275 else 276 IREAD_UNLOCK(ip); 277 return rc; 278 } 279 280 static int jfs_writepage(struct page *page, struct writeback_control *wbc) 281 { 282 return block_write_full_page(page, jfs_get_block, wbc); 283 } 284 285 static int jfs_writepages(struct address_space *mapping, 286 struct writeback_control *wbc) 287 { 288 return mpage_writepages(mapping, wbc, jfs_get_block); 289 } 290 291 static int jfs_readpage(struct file *file, struct page *page) 292 { 293 return mpage_readpage(page, jfs_get_block); 294 } 295 296 static int jfs_readpages(struct file *file, struct address_space *mapping, 297 struct list_head *pages, unsigned nr_pages) 298 { 299 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); 300 } 301 302 static int jfs_write_begin(struct file *file, struct address_space *mapping, 303 loff_t pos, unsigned len, unsigned flags, 304 struct page **pagep, void **fsdata) 305 { 306 return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 307 jfs_get_block); 308 } 309 310 static sector_t jfs_bmap(struct address_space *mapping, sector_t block) 311 { 312 return generic_block_bmap(mapping, block, jfs_get_block); 313 } 314 315 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, 316 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 317 { 318 struct file *file = iocb->ki_filp; 319 struct inode *inode = file->f_mapping->host; 320 321 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 322 offset, nr_segs, jfs_get_block, NULL); 323 } 324 325 const struct address_space_operations jfs_aops = { 326 .readpage = jfs_readpage, 327 .readpages = jfs_readpages, 328 .writepage = jfs_writepage, 329 .writepages = jfs_writepages, 330 .sync_page = block_sync_page, 331 .write_begin = jfs_write_begin, 332 .write_end = nobh_write_end, 333 .bmap = jfs_bmap, 334 .direct_IO = jfs_direct_IO, 335 }; 336 337 /* 338 * Guts of jfs_truncate. Called with locks already held. Can be called 339 * with directory for truncating directory index table. 340 */ 341 void jfs_truncate_nolock(struct inode *ip, loff_t length) 342 { 343 loff_t newsize; 344 tid_t tid; 345 346 ASSERT(length >= 0); 347 348 if (test_cflag(COMMIT_Nolink, ip)) { 349 xtTruncate(0, ip, length, COMMIT_WMAP); 350 return; 351 } 352 353 do { 354 tid = txBegin(ip->i_sb, 0); 355 356 /* 357 * The commit_mutex cannot be taken before txBegin. 358 * txBegin may block and there is a chance the inode 359 * could be marked dirty and need to be committed 360 * before txBegin unblocks 361 */ 362 mutex_lock(&JFS_IP(ip)->commit_mutex); 363 364 newsize = xtTruncate(tid, ip, length, 365 COMMIT_TRUNCATE | COMMIT_PWMAP); 366 if (newsize < 0) { 367 txEnd(tid); 368 mutex_unlock(&JFS_IP(ip)->commit_mutex); 369 break; 370 } 371 372 ip->i_mtime = ip->i_ctime = CURRENT_TIME; 373 mark_inode_dirty(ip); 374 375 txCommit(tid, 1, &ip, 0); 376 txEnd(tid); 377 mutex_unlock(&JFS_IP(ip)->commit_mutex); 378 } while (newsize > length); /* Truncate isn't always atomic */ 379 } 380 381 void jfs_truncate(struct inode *ip) 382 { 383 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); 384 385 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); 386 387 IWRITE_LOCK(ip, RDWRLOCK_NORMAL); 388 jfs_truncate_nolock(ip, ip->i_size); 389 IWRITE_UNLOCK(ip); 390 } 391