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 } 59 60 /* 61 * Workhorse of both fsync & write_inode 62 */ 63 int jfs_commit_inode(struct inode *inode, int wait) 64 { 65 int rc = 0; 66 tid_t tid; 67 static int noisy = 5; 68 69 jfs_info("In jfs_commit_inode, inode = 0x%p", inode); 70 71 /* 72 * Don't commit if inode has been committed since last being 73 * marked dirty, or if it has been deleted. 74 */ 75 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) 76 return 0; 77 78 if (isReadOnly(inode)) { 79 /* kernel allows writes to devices on read-only 80 * partitions and may think inode is dirty 81 */ 82 if (!special_file(inode->i_mode) && noisy) { 83 jfs_err("jfs_commit_inode(0x%p) called on " 84 "read-only volume", inode); 85 jfs_err("Is remount racy?"); 86 noisy--; 87 } 88 return 0; 89 } 90 91 tid = txBegin(inode->i_sb, COMMIT_INODE); 92 down(&JFS_IP(inode)->commit_sem); 93 94 /* 95 * Retest inode state after taking commit_sem 96 */ 97 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) 98 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); 99 100 txEnd(tid); 101 up(&JFS_IP(inode)->commit_sem); 102 return rc; 103 } 104 105 int jfs_write_inode(struct inode *inode, int wait) 106 { 107 if (test_cflag(COMMIT_Nolink, inode)) 108 return 0; 109 /* 110 * If COMMIT_DIRTY is not set, the inode isn't really dirty. 111 * It has been committed since the last change, but was still 112 * on the dirty inode list. 113 */ 114 if (!test_cflag(COMMIT_Dirty, inode)) { 115 /* Make sure committed changes hit the disk */ 116 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); 117 return 0; 118 } 119 120 if (jfs_commit_inode(inode, wait)) { 121 jfs_err("jfs_write_inode: jfs_commit_inode failed!"); 122 return -EIO; 123 } else 124 return 0; 125 } 126 127 void jfs_delete_inode(struct inode *inode) 128 { 129 jfs_info("In jfs_delete_inode, inode = 0x%p", inode); 130 131 if (is_bad_inode(inode) || 132 (JFS_IP(inode)->fileset != cpu_to_le32(FILESYSTEM_I))) 133 return; 134 135 if (test_cflag(COMMIT_Freewmap, inode)) 136 jfs_free_zero_link(inode); 137 138 diFree(inode); 139 140 /* 141 * Free the inode from the quota allocation. 142 */ 143 DQUOT_INIT(inode); 144 DQUOT_FREE_INODE(inode); 145 DQUOT_DROP(inode); 146 147 clear_inode(inode); 148 } 149 150 void jfs_dirty_inode(struct inode *inode) 151 { 152 static int noisy = 5; 153 154 if (isReadOnly(inode)) { 155 if (!special_file(inode->i_mode) && noisy) { 156 /* kernel allows writes to devices on read-only 157 * partitions and may try to mark inode dirty 158 */ 159 jfs_err("jfs_dirty_inode called on read-only volume"); 160 jfs_err("Is remount racy?"); 161 noisy--; 162 } 163 return; 164 } 165 166 set_cflag(COMMIT_Dirty, inode); 167 } 168 169 static int 170 jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks, 171 struct buffer_head *bh_result, int create) 172 { 173 s64 lblock64 = lblock; 174 int rc = 0; 175 xad_t xad; 176 s64 xaddr; 177 int xflag; 178 s32 xlen = max_blocks; 179 180 /* 181 * Take appropriate lock on inode 182 */ 183 if (create) 184 IWRITE_LOCK(ip); 185 else 186 IREAD_LOCK(ip); 187 188 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && 189 (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) && 190 xaddr) { 191 if (xflag & XAD_NOTRECORDED) { 192 if (!create) 193 /* 194 * Allocated but not recorded, read treats 195 * this as a hole 196 */ 197 goto unlock; 198 #ifdef _JFS_4K 199 XADoffset(&xad, lblock64); 200 XADlength(&xad, xlen); 201 XADaddress(&xad, xaddr); 202 #else /* _JFS_4K */ 203 /* 204 * As long as block size = 4K, this isn't a problem. 205 * We should mark the whole page not ABNR, but how 206 * will we know to mark the other blocks BH_New? 207 */ 208 BUG(); 209 #endif /* _JFS_4K */ 210 rc = extRecord(ip, &xad); 211 if (rc) 212 goto unlock; 213 set_buffer_new(bh_result); 214 } 215 216 map_bh(bh_result, ip->i_sb, xaddr); 217 bh_result->b_size = xlen << ip->i_blkbits; 218 goto unlock; 219 } 220 if (!create) 221 goto unlock; 222 223 /* 224 * Allocate a new block 225 */ 226 #ifdef _JFS_4K 227 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) 228 goto unlock; 229 rc = extAlloc(ip, xlen, lblock64, &xad, FALSE); 230 if (rc) 231 goto unlock; 232 233 set_buffer_new(bh_result); 234 map_bh(bh_result, ip->i_sb, addressXAD(&xad)); 235 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; 236 237 #else /* _JFS_4K */ 238 /* 239 * We need to do whatever it takes to keep all but the last buffers 240 * in 4K pages - see jfs_write.c 241 */ 242 BUG(); 243 #endif /* _JFS_4K */ 244 245 unlock: 246 /* 247 * Release lock on inode 248 */ 249 if (create) 250 IWRITE_UNLOCK(ip); 251 else 252 IREAD_UNLOCK(ip); 253 return rc; 254 } 255 256 static int jfs_get_block(struct inode *ip, sector_t lblock, 257 struct buffer_head *bh_result, int create) 258 { 259 return jfs_get_blocks(ip, lblock, 1, bh_result, create); 260 } 261 262 static int jfs_writepage(struct page *page, struct writeback_control *wbc) 263 { 264 return nobh_writepage(page, jfs_get_block, wbc); 265 } 266 267 static int jfs_writepages(struct address_space *mapping, 268 struct writeback_control *wbc) 269 { 270 return mpage_writepages(mapping, wbc, jfs_get_block); 271 } 272 273 static int jfs_readpage(struct file *file, struct page *page) 274 { 275 return mpage_readpage(page, jfs_get_block); 276 } 277 278 static int jfs_readpages(struct file *file, struct address_space *mapping, 279 struct list_head *pages, unsigned nr_pages) 280 { 281 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); 282 } 283 284 static int jfs_prepare_write(struct file *file, 285 struct page *page, unsigned from, unsigned to) 286 { 287 return nobh_prepare_write(page, from, to, jfs_get_block); 288 } 289 290 static sector_t jfs_bmap(struct address_space *mapping, sector_t block) 291 { 292 return generic_block_bmap(mapping, block, jfs_get_block); 293 } 294 295 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, 296 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 297 { 298 struct file *file = iocb->ki_filp; 299 struct inode *inode = file->f_mapping->host; 300 301 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 302 offset, nr_segs, jfs_get_blocks, NULL); 303 } 304 305 struct address_space_operations jfs_aops = { 306 .readpage = jfs_readpage, 307 .readpages = jfs_readpages, 308 .writepage = jfs_writepage, 309 .writepages = jfs_writepages, 310 .sync_page = block_sync_page, 311 .prepare_write = jfs_prepare_write, 312 .commit_write = nobh_commit_write, 313 .bmap = jfs_bmap, 314 .direct_IO = jfs_direct_IO, 315 }; 316 317 /* 318 * Guts of jfs_truncate. Called with locks already held. Can be called 319 * with directory for truncating directory index table. 320 */ 321 void jfs_truncate_nolock(struct inode *ip, loff_t length) 322 { 323 loff_t newsize; 324 tid_t tid; 325 326 ASSERT(length >= 0); 327 328 if (test_cflag(COMMIT_Nolink, ip)) { 329 xtTruncate(0, ip, length, COMMIT_WMAP); 330 return; 331 } 332 333 do { 334 tid = txBegin(ip->i_sb, 0); 335 336 /* 337 * The commit_sem cannot be taken before txBegin. 338 * txBegin may block and there is a chance the inode 339 * could be marked dirty and need to be committed 340 * before txBegin unblocks 341 */ 342 down(&JFS_IP(ip)->commit_sem); 343 344 newsize = xtTruncate(tid, ip, length, 345 COMMIT_TRUNCATE | COMMIT_PWMAP); 346 if (newsize < 0) { 347 txEnd(tid); 348 up(&JFS_IP(ip)->commit_sem); 349 break; 350 } 351 352 ip->i_mtime = ip->i_ctime = CURRENT_TIME; 353 mark_inode_dirty(ip); 354 355 txCommit(tid, 1, &ip, 0); 356 txEnd(tid); 357 up(&JFS_IP(ip)->commit_sem); 358 } while (newsize > length); /* Truncate isn't always atomic */ 359 } 360 361 void jfs_truncate(struct inode *ip) 362 { 363 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); 364 365 nobh_truncate_page(ip->i_mapping, ip->i_size); 366 367 IWRITE_LOCK(ip); 368 jfs_truncate_nolock(ip, ip->i_size); 369 IWRITE_UNLOCK(ip); 370 } 371