1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/vmalloc.h> 24 #include <linux/jbd2.h> 25 #include <linux/slab.h> 26 #include <linux/init.h> 27 #include <linux/blkdev.h> 28 #include <linux/parser.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <linux/vfs.h> 32 #include <linux/random.h> 33 #include <linux/mount.h> 34 #include <linux/namei.h> 35 #include <linux/quotaops.h> 36 #include <linux/seq_file.h> 37 #include <linux/proc_fs.h> 38 #include <linux/ctype.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 #include <linux/cleancache.h> 42 #include <asm/uaccess.h> 43 44 #include <linux/kthread.h> 45 #include <linux/freezer.h> 46 47 #include "ext4.h" 48 #include "ext4_jbd2.h" 49 #include "xattr.h" 50 #include "acl.h" 51 #include "mballoc.h" 52 53 #define CREATE_TRACE_POINTS 54 #include <trace/events/ext4.h> 55 56 static struct proc_dir_entry *ext4_proc_root; 57 static struct kset *ext4_kset; 58 static struct ext4_lazy_init *ext4_li_info; 59 static struct mutex ext4_li_mtx; 60 static struct ext4_features *ext4_feat; 61 62 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 63 unsigned long journal_devnum); 64 static int ext4_commit_super(struct super_block *sb, int sync); 65 static void ext4_mark_recovery_complete(struct super_block *sb, 66 struct ext4_super_block *es); 67 static void ext4_clear_journal_err(struct super_block *sb, 68 struct ext4_super_block *es); 69 static int ext4_sync_fs(struct super_block *sb, int wait); 70 static const char *ext4_decode_error(struct super_block *sb, int errno, 71 char nbuf[16]); 72 static int ext4_remount(struct super_block *sb, int *flags, char *data); 73 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 74 static int ext4_unfreeze(struct super_block *sb); 75 static void ext4_write_super(struct super_block *sb); 76 static int ext4_freeze(struct super_block *sb); 77 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 78 const char *dev_name, void *data); 79 static inline int ext2_feature_set_ok(struct super_block *sb); 80 static inline int ext3_feature_set_ok(struct super_block *sb); 81 static int ext4_feature_set_ok(struct super_block *sb, int readonly); 82 static void ext4_destroy_lazyinit_thread(void); 83 static void ext4_unregister_li_request(struct super_block *sb); 84 static void ext4_clear_request_list(void); 85 86 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 87 static struct file_system_type ext2_fs_type = { 88 .owner = THIS_MODULE, 89 .name = "ext2", 90 .mount = ext4_mount, 91 .kill_sb = kill_block_super, 92 .fs_flags = FS_REQUIRES_DEV, 93 }; 94 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 95 #else 96 #define IS_EXT2_SB(sb) (0) 97 #endif 98 99 100 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 101 static struct file_system_type ext3_fs_type = { 102 .owner = THIS_MODULE, 103 .name = "ext3", 104 .mount = ext4_mount, 105 .kill_sb = kill_block_super, 106 .fs_flags = FS_REQUIRES_DEV, 107 }; 108 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 109 #else 110 #define IS_EXT3_SB(sb) (0) 111 #endif 112 113 void *ext4_kvmalloc(size_t size, gfp_t flags) 114 { 115 void *ret; 116 117 ret = kmalloc(size, flags); 118 if (!ret) 119 ret = __vmalloc(size, flags, PAGE_KERNEL); 120 return ret; 121 } 122 123 void *ext4_kvzalloc(size_t size, gfp_t flags) 124 { 125 void *ret; 126 127 ret = kzalloc(size, flags); 128 if (!ret) 129 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 130 return ret; 131 } 132 133 void ext4_kvfree(void *ptr) 134 { 135 if (is_vmalloc_addr(ptr)) 136 vfree(ptr); 137 else 138 kfree(ptr); 139 140 } 141 142 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 143 struct ext4_group_desc *bg) 144 { 145 return le32_to_cpu(bg->bg_block_bitmap_lo) | 146 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 147 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 148 } 149 150 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 151 struct ext4_group_desc *bg) 152 { 153 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 154 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 155 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 156 } 157 158 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 159 struct ext4_group_desc *bg) 160 { 161 return le32_to_cpu(bg->bg_inode_table_lo) | 162 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 163 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 164 } 165 166 __u32 ext4_free_blks_count(struct super_block *sb, 167 struct ext4_group_desc *bg) 168 { 169 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 170 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 171 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 172 } 173 174 __u32 ext4_free_inodes_count(struct super_block *sb, 175 struct ext4_group_desc *bg) 176 { 177 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 178 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 179 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 180 } 181 182 __u32 ext4_used_dirs_count(struct super_block *sb, 183 struct ext4_group_desc *bg) 184 { 185 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 186 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 187 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 188 } 189 190 __u32 ext4_itable_unused_count(struct super_block *sb, 191 struct ext4_group_desc *bg) 192 { 193 return le16_to_cpu(bg->bg_itable_unused_lo) | 194 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 195 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 196 } 197 198 void ext4_block_bitmap_set(struct super_block *sb, 199 struct ext4_group_desc *bg, ext4_fsblk_t blk) 200 { 201 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 202 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 203 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 204 } 205 206 void ext4_inode_bitmap_set(struct super_block *sb, 207 struct ext4_group_desc *bg, ext4_fsblk_t blk) 208 { 209 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 210 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 211 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 212 } 213 214 void ext4_inode_table_set(struct super_block *sb, 215 struct ext4_group_desc *bg, ext4_fsblk_t blk) 216 { 217 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 218 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 219 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 220 } 221 222 void ext4_free_blks_set(struct super_block *sb, 223 struct ext4_group_desc *bg, __u32 count) 224 { 225 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 226 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 227 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 228 } 229 230 void ext4_free_inodes_set(struct super_block *sb, 231 struct ext4_group_desc *bg, __u32 count) 232 { 233 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 234 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 235 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 236 } 237 238 void ext4_used_dirs_set(struct super_block *sb, 239 struct ext4_group_desc *bg, __u32 count) 240 { 241 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 242 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 243 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 244 } 245 246 void ext4_itable_unused_set(struct super_block *sb, 247 struct ext4_group_desc *bg, __u32 count) 248 { 249 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 250 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 251 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 252 } 253 254 255 /* Just increment the non-pointer handle value */ 256 static handle_t *ext4_get_nojournal(void) 257 { 258 handle_t *handle = current->journal_info; 259 unsigned long ref_cnt = (unsigned long)handle; 260 261 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); 262 263 ref_cnt++; 264 handle = (handle_t *)ref_cnt; 265 266 current->journal_info = handle; 267 return handle; 268 } 269 270 271 /* Decrement the non-pointer handle value */ 272 static void ext4_put_nojournal(handle_t *handle) 273 { 274 unsigned long ref_cnt = (unsigned long)handle; 275 276 BUG_ON(ref_cnt == 0); 277 278 ref_cnt--; 279 handle = (handle_t *)ref_cnt; 280 281 current->journal_info = handle; 282 } 283 284 /* 285 * Wrappers for jbd2_journal_start/end. 286 * 287 * The only special thing we need to do here is to make sure that all 288 * journal_end calls result in the superblock being marked dirty, so 289 * that sync() will call the filesystem's write_super callback if 290 * appropriate. 291 * 292 * To avoid j_barrier hold in userspace when a user calls freeze(), 293 * ext4 prevents a new handle from being started by s_frozen, which 294 * is in an upper layer. 295 */ 296 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 297 { 298 journal_t *journal; 299 handle_t *handle; 300 301 trace_ext4_journal_start(sb, nblocks, _RET_IP_); 302 if (sb->s_flags & MS_RDONLY) 303 return ERR_PTR(-EROFS); 304 305 journal = EXT4_SB(sb)->s_journal; 306 handle = ext4_journal_current_handle(); 307 308 /* 309 * If a handle has been started, it should be allowed to 310 * finish, otherwise deadlock could happen between freeze 311 * and others(e.g. truncate) due to the restart of the 312 * journal handle if the filesystem is forzen and active 313 * handles are not stopped. 314 */ 315 if (!handle) 316 vfs_check_frozen(sb, SB_FREEZE_TRANS); 317 318 if (!journal) 319 return ext4_get_nojournal(); 320 /* 321 * Special case here: if the journal has aborted behind our 322 * backs (eg. EIO in the commit thread), then we still need to 323 * take the FS itself readonly cleanly. 324 */ 325 if (is_journal_aborted(journal)) { 326 ext4_abort(sb, "Detected aborted journal"); 327 return ERR_PTR(-EROFS); 328 } 329 return jbd2_journal_start(journal, nblocks); 330 } 331 332 /* 333 * The only special thing we need to do here is to make sure that all 334 * jbd2_journal_stop calls result in the superblock being marked dirty, so 335 * that sync() will call the filesystem's write_super callback if 336 * appropriate. 337 */ 338 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) 339 { 340 struct super_block *sb; 341 int err; 342 int rc; 343 344 if (!ext4_handle_valid(handle)) { 345 ext4_put_nojournal(handle); 346 return 0; 347 } 348 sb = handle->h_transaction->t_journal->j_private; 349 err = handle->h_err; 350 rc = jbd2_journal_stop(handle); 351 352 if (!err) 353 err = rc; 354 if (err) 355 __ext4_std_error(sb, where, line, err); 356 return err; 357 } 358 359 void ext4_journal_abort_handle(const char *caller, unsigned int line, 360 const char *err_fn, struct buffer_head *bh, 361 handle_t *handle, int err) 362 { 363 char nbuf[16]; 364 const char *errstr = ext4_decode_error(NULL, err, nbuf); 365 366 BUG_ON(!ext4_handle_valid(handle)); 367 368 if (bh) 369 BUFFER_TRACE(bh, "abort"); 370 371 if (!handle->h_err) 372 handle->h_err = err; 373 374 if (is_handle_aborted(handle)) 375 return; 376 377 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n", 378 caller, line, errstr, err_fn); 379 380 jbd2_journal_abort_handle(handle); 381 } 382 383 static void __save_error_info(struct super_block *sb, const char *func, 384 unsigned int line) 385 { 386 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 387 388 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 389 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 390 es->s_last_error_time = cpu_to_le32(get_seconds()); 391 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 392 es->s_last_error_line = cpu_to_le32(line); 393 if (!es->s_first_error_time) { 394 es->s_first_error_time = es->s_last_error_time; 395 strncpy(es->s_first_error_func, func, 396 sizeof(es->s_first_error_func)); 397 es->s_first_error_line = cpu_to_le32(line); 398 es->s_first_error_ino = es->s_last_error_ino; 399 es->s_first_error_block = es->s_last_error_block; 400 } 401 /* 402 * Start the daily error reporting function if it hasn't been 403 * started already 404 */ 405 if (!es->s_error_count) 406 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 407 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); 408 } 409 410 static void save_error_info(struct super_block *sb, const char *func, 411 unsigned int line) 412 { 413 __save_error_info(sb, func, line); 414 ext4_commit_super(sb, 1); 415 } 416 417 418 /* Deal with the reporting of failure conditions on a filesystem such as 419 * inconsistencies detected or read IO failures. 420 * 421 * On ext2, we can store the error state of the filesystem in the 422 * superblock. That is not possible on ext4, because we may have other 423 * write ordering constraints on the superblock which prevent us from 424 * writing it out straight away; and given that the journal is about to 425 * be aborted, we can't rely on the current, or future, transactions to 426 * write out the superblock safely. 427 * 428 * We'll just use the jbd2_journal_abort() error code to record an error in 429 * the journal instead. On recovery, the journal will complain about 430 * that error until we've noted it down and cleared it. 431 */ 432 433 static void ext4_handle_error(struct super_block *sb) 434 { 435 if (sb->s_flags & MS_RDONLY) 436 return; 437 438 if (!test_opt(sb, ERRORS_CONT)) { 439 journal_t *journal = EXT4_SB(sb)->s_journal; 440 441 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 442 if (journal) 443 jbd2_journal_abort(journal, -EIO); 444 } 445 if (test_opt(sb, ERRORS_RO)) { 446 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 447 sb->s_flags |= MS_RDONLY; 448 } 449 if (test_opt(sb, ERRORS_PANIC)) 450 panic("EXT4-fs (device %s): panic forced after error\n", 451 sb->s_id); 452 } 453 454 void __ext4_error(struct super_block *sb, const char *function, 455 unsigned int line, const char *fmt, ...) 456 { 457 struct va_format vaf; 458 va_list args; 459 460 va_start(args, fmt); 461 vaf.fmt = fmt; 462 vaf.va = &args; 463 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 464 sb->s_id, function, line, current->comm, &vaf); 465 va_end(args); 466 467 ext4_handle_error(sb); 468 } 469 470 void ext4_error_inode(struct inode *inode, const char *function, 471 unsigned int line, ext4_fsblk_t block, 472 const char *fmt, ...) 473 { 474 va_list args; 475 struct va_format vaf; 476 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 477 478 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 479 es->s_last_error_block = cpu_to_le64(block); 480 save_error_info(inode->i_sb, function, line); 481 va_start(args, fmt); 482 vaf.fmt = fmt; 483 vaf.va = &args; 484 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ", 485 inode->i_sb->s_id, function, line, inode->i_ino); 486 if (block) 487 printk(KERN_CONT "block %llu: ", block); 488 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf); 489 va_end(args); 490 491 ext4_handle_error(inode->i_sb); 492 } 493 494 void ext4_error_file(struct file *file, const char *function, 495 unsigned int line, ext4_fsblk_t block, 496 const char *fmt, ...) 497 { 498 va_list args; 499 struct va_format vaf; 500 struct ext4_super_block *es; 501 struct inode *inode = file->f_dentry->d_inode; 502 char pathname[80], *path; 503 504 es = EXT4_SB(inode->i_sb)->s_es; 505 es->s_last_error_ino = cpu_to_le32(inode->i_ino); 506 save_error_info(inode->i_sb, function, line); 507 path = d_path(&(file->f_path), pathname, sizeof(pathname)); 508 if (IS_ERR(path)) 509 path = "(unknown)"; 510 printk(KERN_CRIT 511 "EXT4-fs error (device %s): %s:%d: inode #%lu: ", 512 inode->i_sb->s_id, function, line, inode->i_ino); 513 if (block) 514 printk(KERN_CONT "block %llu: ", block); 515 va_start(args, fmt); 516 vaf.fmt = fmt; 517 vaf.va = &args; 518 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf); 519 va_end(args); 520 521 ext4_handle_error(inode->i_sb); 522 } 523 524 static const char *ext4_decode_error(struct super_block *sb, int errno, 525 char nbuf[16]) 526 { 527 char *errstr = NULL; 528 529 switch (errno) { 530 case -EIO: 531 errstr = "IO failure"; 532 break; 533 case -ENOMEM: 534 errstr = "Out of memory"; 535 break; 536 case -EROFS: 537 if (!sb || (EXT4_SB(sb)->s_journal && 538 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 539 errstr = "Journal has aborted"; 540 else 541 errstr = "Readonly filesystem"; 542 break; 543 default: 544 /* If the caller passed in an extra buffer for unknown 545 * errors, textualise them now. Else we just return 546 * NULL. */ 547 if (nbuf) { 548 /* Check for truncated error codes... */ 549 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 550 errstr = nbuf; 551 } 552 break; 553 } 554 555 return errstr; 556 } 557 558 /* __ext4_std_error decodes expected errors from journaling functions 559 * automatically and invokes the appropriate error response. */ 560 561 void __ext4_std_error(struct super_block *sb, const char *function, 562 unsigned int line, int errno) 563 { 564 char nbuf[16]; 565 const char *errstr; 566 567 /* Special case: if the error is EROFS, and we're not already 568 * inside a transaction, then there's really no point in logging 569 * an error. */ 570 if (errno == -EROFS && journal_current_handle() == NULL && 571 (sb->s_flags & MS_RDONLY)) 572 return; 573 574 errstr = ext4_decode_error(sb, errno, nbuf); 575 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 576 sb->s_id, function, line, errstr); 577 save_error_info(sb, function, line); 578 579 ext4_handle_error(sb); 580 } 581 582 /* 583 * ext4_abort is a much stronger failure handler than ext4_error. The 584 * abort function may be used to deal with unrecoverable failures such 585 * as journal IO errors or ENOMEM at a critical moment in log management. 586 * 587 * We unconditionally force the filesystem into an ABORT|READONLY state, 588 * unless the error response on the fs has been set to panic in which 589 * case we take the easy way out and panic immediately. 590 */ 591 592 void __ext4_abort(struct super_block *sb, const char *function, 593 unsigned int line, const char *fmt, ...) 594 { 595 va_list args; 596 597 save_error_info(sb, function, line); 598 va_start(args, fmt); 599 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 600 function, line); 601 vprintk(fmt, args); 602 printk("\n"); 603 va_end(args); 604 605 if ((sb->s_flags & MS_RDONLY) == 0) { 606 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 607 sb->s_flags |= MS_RDONLY; 608 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 609 if (EXT4_SB(sb)->s_journal) 610 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 611 save_error_info(sb, function, line); 612 } 613 if (test_opt(sb, ERRORS_PANIC)) 614 panic("EXT4-fs panic from previous error\n"); 615 } 616 617 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) 618 { 619 struct va_format vaf; 620 va_list args; 621 622 va_start(args, fmt); 623 vaf.fmt = fmt; 624 vaf.va = &args; 625 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 626 va_end(args); 627 } 628 629 void __ext4_warning(struct super_block *sb, const char *function, 630 unsigned int line, const char *fmt, ...) 631 { 632 struct va_format vaf; 633 va_list args; 634 635 va_start(args, fmt); 636 vaf.fmt = fmt; 637 vaf.va = &args; 638 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 639 sb->s_id, function, line, &vaf); 640 va_end(args); 641 } 642 643 void __ext4_grp_locked_error(const char *function, unsigned int line, 644 struct super_block *sb, ext4_group_t grp, 645 unsigned long ino, ext4_fsblk_t block, 646 const char *fmt, ...) 647 __releases(bitlock) 648 __acquires(bitlock) 649 { 650 struct va_format vaf; 651 va_list args; 652 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 653 654 es->s_last_error_ino = cpu_to_le32(ino); 655 es->s_last_error_block = cpu_to_le64(block); 656 __save_error_info(sb, function, line); 657 658 va_start(args, fmt); 659 660 vaf.fmt = fmt; 661 vaf.va = &args; 662 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 663 sb->s_id, function, line, grp); 664 if (ino) 665 printk(KERN_CONT "inode %lu: ", ino); 666 if (block) 667 printk(KERN_CONT "block %llu:", (unsigned long long) block); 668 printk(KERN_CONT "%pV\n", &vaf); 669 va_end(args); 670 671 if (test_opt(sb, ERRORS_CONT)) { 672 ext4_commit_super(sb, 0); 673 return; 674 } 675 676 ext4_unlock_group(sb, grp); 677 ext4_handle_error(sb); 678 /* 679 * We only get here in the ERRORS_RO case; relocking the group 680 * may be dangerous, but nothing bad will happen since the 681 * filesystem will have already been marked read/only and the 682 * journal has been aborted. We return 1 as a hint to callers 683 * who might what to use the return value from 684 * ext4_grp_locked_error() to distinguish between the 685 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 686 * aggressively from the ext4 function in question, with a 687 * more appropriate error code. 688 */ 689 ext4_lock_group(sb, grp); 690 return; 691 } 692 693 void ext4_update_dynamic_rev(struct super_block *sb) 694 { 695 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 696 697 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 698 return; 699 700 ext4_warning(sb, 701 "updating to rev %d because of new feature flag, " 702 "running e2fsck is recommended", 703 EXT4_DYNAMIC_REV); 704 705 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 706 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 707 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 708 /* leave es->s_feature_*compat flags alone */ 709 /* es->s_uuid will be set by e2fsck if empty */ 710 711 /* 712 * The rest of the superblock fields should be zero, and if not it 713 * means they are likely already in use, so leave them alone. We 714 * can leave it up to e2fsck to clean up any inconsistencies there. 715 */ 716 } 717 718 /* 719 * Open the external journal device 720 */ 721 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 722 { 723 struct block_device *bdev; 724 char b[BDEVNAME_SIZE]; 725 726 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 727 if (IS_ERR(bdev)) 728 goto fail; 729 return bdev; 730 731 fail: 732 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 733 __bdevname(dev, b), PTR_ERR(bdev)); 734 return NULL; 735 } 736 737 /* 738 * Release the journal device 739 */ 740 static int ext4_blkdev_put(struct block_device *bdev) 741 { 742 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 743 } 744 745 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 746 { 747 struct block_device *bdev; 748 int ret = -ENODEV; 749 750 bdev = sbi->journal_bdev; 751 if (bdev) { 752 ret = ext4_blkdev_put(bdev); 753 sbi->journal_bdev = NULL; 754 } 755 return ret; 756 } 757 758 static inline struct inode *orphan_list_entry(struct list_head *l) 759 { 760 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 761 } 762 763 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 764 { 765 struct list_head *l; 766 767 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 768 le32_to_cpu(sbi->s_es->s_last_orphan)); 769 770 printk(KERN_ERR "sb_info orphan list:\n"); 771 list_for_each(l, &sbi->s_orphan) { 772 struct inode *inode = orphan_list_entry(l); 773 printk(KERN_ERR " " 774 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 775 inode->i_sb->s_id, inode->i_ino, inode, 776 inode->i_mode, inode->i_nlink, 777 NEXT_ORPHAN(inode)); 778 } 779 } 780 781 static void ext4_put_super(struct super_block *sb) 782 { 783 struct ext4_sb_info *sbi = EXT4_SB(sb); 784 struct ext4_super_block *es = sbi->s_es; 785 int i, err; 786 787 ext4_unregister_li_request(sb); 788 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 789 790 flush_workqueue(sbi->dio_unwritten_wq); 791 destroy_workqueue(sbi->dio_unwritten_wq); 792 793 lock_super(sb); 794 if (sb->s_dirt) 795 ext4_commit_super(sb, 1); 796 797 if (sbi->s_journal) { 798 err = jbd2_journal_destroy(sbi->s_journal); 799 sbi->s_journal = NULL; 800 if (err < 0) 801 ext4_abort(sb, "Couldn't clean up the journal"); 802 } 803 804 del_timer(&sbi->s_err_report); 805 ext4_release_system_zone(sb); 806 ext4_mb_release(sb); 807 ext4_ext_release(sb); 808 ext4_xattr_put_super(sb); 809 810 if (!(sb->s_flags & MS_RDONLY)) { 811 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 812 es->s_state = cpu_to_le16(sbi->s_mount_state); 813 ext4_commit_super(sb, 1); 814 } 815 if (sbi->s_proc) { 816 remove_proc_entry(sb->s_id, ext4_proc_root); 817 } 818 kobject_del(&sbi->s_kobj); 819 820 for (i = 0; i < sbi->s_gdb_count; i++) 821 brelse(sbi->s_group_desc[i]); 822 ext4_kvfree(sbi->s_group_desc); 823 ext4_kvfree(sbi->s_flex_groups); 824 percpu_counter_destroy(&sbi->s_freeblocks_counter); 825 percpu_counter_destroy(&sbi->s_freeinodes_counter); 826 percpu_counter_destroy(&sbi->s_dirs_counter); 827 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 828 brelse(sbi->s_sbh); 829 #ifdef CONFIG_QUOTA 830 for (i = 0; i < MAXQUOTAS; i++) 831 kfree(sbi->s_qf_names[i]); 832 #endif 833 834 /* Debugging code just in case the in-memory inode orphan list 835 * isn't empty. The on-disk one can be non-empty if we've 836 * detected an error and taken the fs readonly, but the 837 * in-memory list had better be clean by this point. */ 838 if (!list_empty(&sbi->s_orphan)) 839 dump_orphan_list(sb, sbi); 840 J_ASSERT(list_empty(&sbi->s_orphan)); 841 842 invalidate_bdev(sb->s_bdev); 843 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 844 /* 845 * Invalidate the journal device's buffers. We don't want them 846 * floating about in memory - the physical journal device may 847 * hotswapped, and it breaks the `ro-after' testing code. 848 */ 849 sync_blockdev(sbi->journal_bdev); 850 invalidate_bdev(sbi->journal_bdev); 851 ext4_blkdev_remove(sbi); 852 } 853 if (sbi->s_mmp_tsk) 854 kthread_stop(sbi->s_mmp_tsk); 855 sb->s_fs_info = NULL; 856 /* 857 * Now that we are completely done shutting down the 858 * superblock, we need to actually destroy the kobject. 859 */ 860 unlock_super(sb); 861 kobject_put(&sbi->s_kobj); 862 wait_for_completion(&sbi->s_kobj_unregister); 863 kfree(sbi->s_blockgroup_lock); 864 kfree(sbi); 865 } 866 867 static struct kmem_cache *ext4_inode_cachep; 868 869 /* 870 * Called inside transaction, so use GFP_NOFS 871 */ 872 static struct inode *ext4_alloc_inode(struct super_block *sb) 873 { 874 struct ext4_inode_info *ei; 875 876 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 877 if (!ei) 878 return NULL; 879 880 ei->vfs_inode.i_version = 1; 881 ei->vfs_inode.i_data.writeback_index = 0; 882 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 883 INIT_LIST_HEAD(&ei->i_prealloc_list); 884 spin_lock_init(&ei->i_prealloc_lock); 885 ei->i_reserved_data_blocks = 0; 886 ei->i_reserved_meta_blocks = 0; 887 ei->i_allocated_meta_blocks = 0; 888 ei->i_da_metadata_calc_len = 0; 889 spin_lock_init(&(ei->i_block_reservation_lock)); 890 #ifdef CONFIG_QUOTA 891 ei->i_reserved_quota = 0; 892 #endif 893 ei->jinode = NULL; 894 INIT_LIST_HEAD(&ei->i_completed_io_list); 895 spin_lock_init(&ei->i_completed_io_lock); 896 ei->cur_aio_dio = NULL; 897 ei->i_sync_tid = 0; 898 ei->i_datasync_tid = 0; 899 atomic_set(&ei->i_ioend_count, 0); 900 atomic_set(&ei->i_aiodio_unwritten, 0); 901 902 return &ei->vfs_inode; 903 } 904 905 static int ext4_drop_inode(struct inode *inode) 906 { 907 int drop = generic_drop_inode(inode); 908 909 trace_ext4_drop_inode(inode, drop); 910 return drop; 911 } 912 913 static void ext4_i_callback(struct rcu_head *head) 914 { 915 struct inode *inode = container_of(head, struct inode, i_rcu); 916 INIT_LIST_HEAD(&inode->i_dentry); 917 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 918 } 919 920 static void ext4_destroy_inode(struct inode *inode) 921 { 922 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 923 ext4_msg(inode->i_sb, KERN_ERR, 924 "Inode %lu (%p): orphan list check failed!", 925 inode->i_ino, EXT4_I(inode)); 926 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 927 EXT4_I(inode), sizeof(struct ext4_inode_info), 928 true); 929 dump_stack(); 930 } 931 call_rcu(&inode->i_rcu, ext4_i_callback); 932 } 933 934 static void init_once(void *foo) 935 { 936 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 937 938 INIT_LIST_HEAD(&ei->i_orphan); 939 #ifdef CONFIG_EXT4_FS_XATTR 940 init_rwsem(&ei->xattr_sem); 941 #endif 942 init_rwsem(&ei->i_data_sem); 943 inode_init_once(&ei->vfs_inode); 944 } 945 946 static int init_inodecache(void) 947 { 948 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 949 sizeof(struct ext4_inode_info), 950 0, (SLAB_RECLAIM_ACCOUNT| 951 SLAB_MEM_SPREAD), 952 init_once); 953 if (ext4_inode_cachep == NULL) 954 return -ENOMEM; 955 return 0; 956 } 957 958 static void destroy_inodecache(void) 959 { 960 kmem_cache_destroy(ext4_inode_cachep); 961 } 962 963 void ext4_clear_inode(struct inode *inode) 964 { 965 invalidate_inode_buffers(inode); 966 end_writeback(inode); 967 dquot_drop(inode); 968 ext4_discard_preallocations(inode); 969 if (EXT4_I(inode)->jinode) { 970 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 971 EXT4_I(inode)->jinode); 972 jbd2_free_inode(EXT4_I(inode)->jinode); 973 EXT4_I(inode)->jinode = NULL; 974 } 975 } 976 977 static inline void ext4_show_quota_options(struct seq_file *seq, 978 struct super_block *sb) 979 { 980 #if defined(CONFIG_QUOTA) 981 struct ext4_sb_info *sbi = EXT4_SB(sb); 982 983 if (sbi->s_jquota_fmt) { 984 char *fmtname = ""; 985 986 switch (sbi->s_jquota_fmt) { 987 case QFMT_VFS_OLD: 988 fmtname = "vfsold"; 989 break; 990 case QFMT_VFS_V0: 991 fmtname = "vfsv0"; 992 break; 993 case QFMT_VFS_V1: 994 fmtname = "vfsv1"; 995 break; 996 } 997 seq_printf(seq, ",jqfmt=%s", fmtname); 998 } 999 1000 if (sbi->s_qf_names[USRQUOTA]) 1001 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 1002 1003 if (sbi->s_qf_names[GRPQUOTA]) 1004 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 1005 1006 if (test_opt(sb, USRQUOTA)) 1007 seq_puts(seq, ",usrquota"); 1008 1009 if (test_opt(sb, GRPQUOTA)) 1010 seq_puts(seq, ",grpquota"); 1011 #endif 1012 } 1013 1014 /* 1015 * Show an option if 1016 * - it's set to a non-default value OR 1017 * - if the per-sb default is different from the global default 1018 */ 1019 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 1020 { 1021 int def_errors; 1022 unsigned long def_mount_opts; 1023 struct super_block *sb = vfs->mnt_sb; 1024 struct ext4_sb_info *sbi = EXT4_SB(sb); 1025 struct ext4_super_block *es = sbi->s_es; 1026 1027 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1028 def_errors = le16_to_cpu(es->s_errors); 1029 1030 if (sbi->s_sb_block != 1) 1031 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 1032 if (test_opt(sb, MINIX_DF)) 1033 seq_puts(seq, ",minixdf"); 1034 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 1035 seq_puts(seq, ",grpid"); 1036 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 1037 seq_puts(seq, ",nogrpid"); 1038 if (sbi->s_resuid != EXT4_DEF_RESUID || 1039 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 1040 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 1041 } 1042 if (sbi->s_resgid != EXT4_DEF_RESGID || 1043 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 1044 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 1045 } 1046 if (test_opt(sb, ERRORS_RO)) { 1047 if (def_errors == EXT4_ERRORS_PANIC || 1048 def_errors == EXT4_ERRORS_CONTINUE) { 1049 seq_puts(seq, ",errors=remount-ro"); 1050 } 1051 } 1052 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 1053 seq_puts(seq, ",errors=continue"); 1054 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 1055 seq_puts(seq, ",errors=panic"); 1056 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 1057 seq_puts(seq, ",nouid32"); 1058 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 1059 seq_puts(seq, ",debug"); 1060 if (test_opt(sb, OLDALLOC)) 1061 seq_puts(seq, ",oldalloc"); 1062 #ifdef CONFIG_EXT4_FS_XATTR 1063 if (test_opt(sb, XATTR_USER)) 1064 seq_puts(seq, ",user_xattr"); 1065 if (!test_opt(sb, XATTR_USER)) 1066 seq_puts(seq, ",nouser_xattr"); 1067 #endif 1068 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1069 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 1070 seq_puts(seq, ",acl"); 1071 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 1072 seq_puts(seq, ",noacl"); 1073 #endif 1074 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 1075 seq_printf(seq, ",commit=%u", 1076 (unsigned) (sbi->s_commit_interval / HZ)); 1077 } 1078 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 1079 seq_printf(seq, ",min_batch_time=%u", 1080 (unsigned) sbi->s_min_batch_time); 1081 } 1082 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 1083 seq_printf(seq, ",max_batch_time=%u", 1084 (unsigned) sbi->s_min_batch_time); 1085 } 1086 1087 /* 1088 * We're changing the default of barrier mount option, so 1089 * let's always display its mount state so it's clear what its 1090 * status is. 1091 */ 1092 seq_puts(seq, ",barrier="); 1093 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 1094 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 1095 seq_puts(seq, ",journal_async_commit"); 1096 else if (test_opt(sb, JOURNAL_CHECKSUM)) 1097 seq_puts(seq, ",journal_checksum"); 1098 if (test_opt(sb, I_VERSION)) 1099 seq_puts(seq, ",i_version"); 1100 if (!test_opt(sb, DELALLOC) && 1101 !(def_mount_opts & EXT4_DEFM_NODELALLOC)) 1102 seq_puts(seq, ",nodelalloc"); 1103 1104 if (!test_opt(sb, MBLK_IO_SUBMIT)) 1105 seq_puts(seq, ",nomblk_io_submit"); 1106 if (sbi->s_stripe) 1107 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 1108 /* 1109 * journal mode get enabled in different ways 1110 * So just print the value even if we didn't specify it 1111 */ 1112 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1113 seq_puts(seq, ",data=journal"); 1114 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1115 seq_puts(seq, ",data=ordered"); 1116 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1117 seq_puts(seq, ",data=writeback"); 1118 1119 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1120 seq_printf(seq, ",inode_readahead_blks=%u", 1121 sbi->s_inode_readahead_blks); 1122 1123 if (test_opt(sb, DATA_ERR_ABORT)) 1124 seq_puts(seq, ",data_err=abort"); 1125 1126 if (test_opt(sb, NO_AUTO_DA_ALLOC)) 1127 seq_puts(seq, ",noauto_da_alloc"); 1128 1129 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) 1130 seq_puts(seq, ",discard"); 1131 1132 if (test_opt(sb, NOLOAD)) 1133 seq_puts(seq, ",norecovery"); 1134 1135 if (test_opt(sb, DIOREAD_NOLOCK)) 1136 seq_puts(seq, ",dioread_nolock"); 1137 1138 if (test_opt(sb, BLOCK_VALIDITY) && 1139 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)) 1140 seq_puts(seq, ",block_validity"); 1141 1142 if (!test_opt(sb, INIT_INODE_TABLE)) 1143 seq_puts(seq, ",noinit_inode_table"); 1144 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT) 1145 seq_printf(seq, ",init_inode_table=%u", 1146 (unsigned) sbi->s_li_wait_mult); 1147 1148 ext4_show_quota_options(seq, sb); 1149 1150 return 0; 1151 } 1152 1153 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 1154 u64 ino, u32 generation) 1155 { 1156 struct inode *inode; 1157 1158 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1159 return ERR_PTR(-ESTALE); 1160 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1161 return ERR_PTR(-ESTALE); 1162 1163 /* iget isn't really right if the inode is currently unallocated!! 1164 * 1165 * ext4_read_inode will return a bad_inode if the inode had been 1166 * deleted, so we should be safe. 1167 * 1168 * Currently we don't know the generation for parent directory, so 1169 * a generation of 0 means "accept any" 1170 */ 1171 inode = ext4_iget(sb, ino); 1172 if (IS_ERR(inode)) 1173 return ERR_CAST(inode); 1174 if (generation && inode->i_generation != generation) { 1175 iput(inode); 1176 return ERR_PTR(-ESTALE); 1177 } 1178 1179 return inode; 1180 } 1181 1182 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 1183 int fh_len, int fh_type) 1184 { 1185 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1186 ext4_nfs_get_inode); 1187 } 1188 1189 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 1190 int fh_len, int fh_type) 1191 { 1192 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1193 ext4_nfs_get_inode); 1194 } 1195 1196 /* 1197 * Try to release metadata pages (indirect blocks, directories) which are 1198 * mapped via the block device. Since these pages could have journal heads 1199 * which would prevent try_to_free_buffers() from freeing them, we must use 1200 * jbd2 layer's try_to_free_buffers() function to release them. 1201 */ 1202 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 1203 gfp_t wait) 1204 { 1205 journal_t *journal = EXT4_SB(sb)->s_journal; 1206 1207 WARN_ON(PageChecked(page)); 1208 if (!page_has_buffers(page)) 1209 return 0; 1210 if (journal) 1211 return jbd2_journal_try_to_free_buffers(journal, page, 1212 wait & ~__GFP_WAIT); 1213 return try_to_free_buffers(page); 1214 } 1215 1216 #ifdef CONFIG_QUOTA 1217 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 1218 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 1219 1220 static int ext4_write_dquot(struct dquot *dquot); 1221 static int ext4_acquire_dquot(struct dquot *dquot); 1222 static int ext4_release_dquot(struct dquot *dquot); 1223 static int ext4_mark_dquot_dirty(struct dquot *dquot); 1224 static int ext4_write_info(struct super_block *sb, int type); 1225 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1226 struct path *path); 1227 static int ext4_quota_off(struct super_block *sb, int type); 1228 static int ext4_quota_on_mount(struct super_block *sb, int type); 1229 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1230 size_t len, loff_t off); 1231 static ssize_t ext4_quota_write(struct super_block *sb, int type, 1232 const char *data, size_t len, loff_t off); 1233 1234 static const struct dquot_operations ext4_quota_operations = { 1235 .get_reserved_space = ext4_get_reserved_space, 1236 .write_dquot = ext4_write_dquot, 1237 .acquire_dquot = ext4_acquire_dquot, 1238 .release_dquot = ext4_release_dquot, 1239 .mark_dirty = ext4_mark_dquot_dirty, 1240 .write_info = ext4_write_info, 1241 .alloc_dquot = dquot_alloc, 1242 .destroy_dquot = dquot_destroy, 1243 }; 1244 1245 static const struct quotactl_ops ext4_qctl_operations = { 1246 .quota_on = ext4_quota_on, 1247 .quota_off = ext4_quota_off, 1248 .quota_sync = dquot_quota_sync, 1249 .get_info = dquot_get_dqinfo, 1250 .set_info = dquot_set_dqinfo, 1251 .get_dqblk = dquot_get_dqblk, 1252 .set_dqblk = dquot_set_dqblk 1253 }; 1254 #endif 1255 1256 static const struct super_operations ext4_sops = { 1257 .alloc_inode = ext4_alloc_inode, 1258 .destroy_inode = ext4_destroy_inode, 1259 .write_inode = ext4_write_inode, 1260 .dirty_inode = ext4_dirty_inode, 1261 .drop_inode = ext4_drop_inode, 1262 .evict_inode = ext4_evict_inode, 1263 .put_super = ext4_put_super, 1264 .sync_fs = ext4_sync_fs, 1265 .freeze_fs = ext4_freeze, 1266 .unfreeze_fs = ext4_unfreeze, 1267 .statfs = ext4_statfs, 1268 .remount_fs = ext4_remount, 1269 .show_options = ext4_show_options, 1270 #ifdef CONFIG_QUOTA 1271 .quota_read = ext4_quota_read, 1272 .quota_write = ext4_quota_write, 1273 #endif 1274 .bdev_try_to_free_page = bdev_try_to_free_page, 1275 }; 1276 1277 static const struct super_operations ext4_nojournal_sops = { 1278 .alloc_inode = ext4_alloc_inode, 1279 .destroy_inode = ext4_destroy_inode, 1280 .write_inode = ext4_write_inode, 1281 .dirty_inode = ext4_dirty_inode, 1282 .drop_inode = ext4_drop_inode, 1283 .evict_inode = ext4_evict_inode, 1284 .write_super = ext4_write_super, 1285 .put_super = ext4_put_super, 1286 .statfs = ext4_statfs, 1287 .remount_fs = ext4_remount, 1288 .show_options = ext4_show_options, 1289 #ifdef CONFIG_QUOTA 1290 .quota_read = ext4_quota_read, 1291 .quota_write = ext4_quota_write, 1292 #endif 1293 .bdev_try_to_free_page = bdev_try_to_free_page, 1294 }; 1295 1296 static const struct export_operations ext4_export_ops = { 1297 .fh_to_dentry = ext4_fh_to_dentry, 1298 .fh_to_parent = ext4_fh_to_parent, 1299 .get_parent = ext4_get_parent, 1300 }; 1301 1302 enum { 1303 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1304 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1305 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, 1306 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1307 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh, 1308 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1309 Opt_journal_update, Opt_journal_dev, 1310 Opt_journal_checksum, Opt_journal_async_commit, 1311 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1312 Opt_data_err_abort, Opt_data_err_ignore, 1313 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1314 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1315 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, 1316 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version, 1317 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 1318 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 1319 Opt_inode_readahead_blks, Opt_journal_ioprio, 1320 Opt_dioread_nolock, Opt_dioread_lock, 1321 Opt_discard, Opt_nodiscard, 1322 Opt_init_inode_table, Opt_noinit_inode_table, 1323 }; 1324 1325 static const match_table_t tokens = { 1326 {Opt_bsd_df, "bsddf"}, 1327 {Opt_minix_df, "minixdf"}, 1328 {Opt_grpid, "grpid"}, 1329 {Opt_grpid, "bsdgroups"}, 1330 {Opt_nogrpid, "nogrpid"}, 1331 {Opt_nogrpid, "sysvgroups"}, 1332 {Opt_resgid, "resgid=%u"}, 1333 {Opt_resuid, "resuid=%u"}, 1334 {Opt_sb, "sb=%u"}, 1335 {Opt_err_cont, "errors=continue"}, 1336 {Opt_err_panic, "errors=panic"}, 1337 {Opt_err_ro, "errors=remount-ro"}, 1338 {Opt_nouid32, "nouid32"}, 1339 {Opt_debug, "debug"}, 1340 {Opt_oldalloc, "oldalloc"}, 1341 {Opt_orlov, "orlov"}, 1342 {Opt_user_xattr, "user_xattr"}, 1343 {Opt_nouser_xattr, "nouser_xattr"}, 1344 {Opt_acl, "acl"}, 1345 {Opt_noacl, "noacl"}, 1346 {Opt_noload, "noload"}, 1347 {Opt_noload, "norecovery"}, 1348 {Opt_nobh, "nobh"}, 1349 {Opt_bh, "bh"}, 1350 {Opt_commit, "commit=%u"}, 1351 {Opt_min_batch_time, "min_batch_time=%u"}, 1352 {Opt_max_batch_time, "max_batch_time=%u"}, 1353 {Opt_journal_update, "journal=update"}, 1354 {Opt_journal_dev, "journal_dev=%u"}, 1355 {Opt_journal_checksum, "journal_checksum"}, 1356 {Opt_journal_async_commit, "journal_async_commit"}, 1357 {Opt_abort, "abort"}, 1358 {Opt_data_journal, "data=journal"}, 1359 {Opt_data_ordered, "data=ordered"}, 1360 {Opt_data_writeback, "data=writeback"}, 1361 {Opt_data_err_abort, "data_err=abort"}, 1362 {Opt_data_err_ignore, "data_err=ignore"}, 1363 {Opt_offusrjquota, "usrjquota="}, 1364 {Opt_usrjquota, "usrjquota=%s"}, 1365 {Opt_offgrpjquota, "grpjquota="}, 1366 {Opt_grpjquota, "grpjquota=%s"}, 1367 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1368 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1369 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1370 {Opt_grpquota, "grpquota"}, 1371 {Opt_noquota, "noquota"}, 1372 {Opt_quota, "quota"}, 1373 {Opt_usrquota, "usrquota"}, 1374 {Opt_barrier, "barrier=%u"}, 1375 {Opt_barrier, "barrier"}, 1376 {Opt_nobarrier, "nobarrier"}, 1377 {Opt_i_version, "i_version"}, 1378 {Opt_stripe, "stripe=%u"}, 1379 {Opt_resize, "resize"}, 1380 {Opt_delalloc, "delalloc"}, 1381 {Opt_nodelalloc, "nodelalloc"}, 1382 {Opt_mblk_io_submit, "mblk_io_submit"}, 1383 {Opt_nomblk_io_submit, "nomblk_io_submit"}, 1384 {Opt_block_validity, "block_validity"}, 1385 {Opt_noblock_validity, "noblock_validity"}, 1386 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1387 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1388 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1389 {Opt_auto_da_alloc, "auto_da_alloc"}, 1390 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1391 {Opt_dioread_nolock, "dioread_nolock"}, 1392 {Opt_dioread_lock, "dioread_lock"}, 1393 {Opt_discard, "discard"}, 1394 {Opt_nodiscard, "nodiscard"}, 1395 {Opt_init_inode_table, "init_itable=%u"}, 1396 {Opt_init_inode_table, "init_itable"}, 1397 {Opt_noinit_inode_table, "noinit_itable"}, 1398 {Opt_err, NULL}, 1399 }; 1400 1401 static ext4_fsblk_t get_sb_block(void **data) 1402 { 1403 ext4_fsblk_t sb_block; 1404 char *options = (char *) *data; 1405 1406 if (!options || strncmp(options, "sb=", 3) != 0) 1407 return 1; /* Default location */ 1408 1409 options += 3; 1410 /* TODO: use simple_strtoll with >32bit ext4 */ 1411 sb_block = simple_strtoul(options, &options, 0); 1412 if (*options && *options != ',') { 1413 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1414 (char *) *data); 1415 return 1; 1416 } 1417 if (*options == ',') 1418 options++; 1419 *data = (void *) options; 1420 1421 return sb_block; 1422 } 1423 1424 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1425 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1426 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1427 1428 #ifdef CONFIG_QUOTA 1429 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 1430 { 1431 struct ext4_sb_info *sbi = EXT4_SB(sb); 1432 char *qname; 1433 1434 if (sb_any_quota_loaded(sb) && 1435 !sbi->s_qf_names[qtype]) { 1436 ext4_msg(sb, KERN_ERR, 1437 "Cannot change journaled " 1438 "quota options when quota turned on"); 1439 return 0; 1440 } 1441 qname = match_strdup(args); 1442 if (!qname) { 1443 ext4_msg(sb, KERN_ERR, 1444 "Not enough memory for storing quotafile name"); 1445 return 0; 1446 } 1447 if (sbi->s_qf_names[qtype] && 1448 strcmp(sbi->s_qf_names[qtype], qname)) { 1449 ext4_msg(sb, KERN_ERR, 1450 "%s quota file already specified", QTYPE2NAME(qtype)); 1451 kfree(qname); 1452 return 0; 1453 } 1454 sbi->s_qf_names[qtype] = qname; 1455 if (strchr(sbi->s_qf_names[qtype], '/')) { 1456 ext4_msg(sb, KERN_ERR, 1457 "quotafile must be on filesystem root"); 1458 kfree(sbi->s_qf_names[qtype]); 1459 sbi->s_qf_names[qtype] = NULL; 1460 return 0; 1461 } 1462 set_opt(sb, QUOTA); 1463 return 1; 1464 } 1465 1466 static int clear_qf_name(struct super_block *sb, int qtype) 1467 { 1468 1469 struct ext4_sb_info *sbi = EXT4_SB(sb); 1470 1471 if (sb_any_quota_loaded(sb) && 1472 sbi->s_qf_names[qtype]) { 1473 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 1474 " when quota turned on"); 1475 return 0; 1476 } 1477 /* 1478 * The space will be released later when all options are confirmed 1479 * to be correct 1480 */ 1481 sbi->s_qf_names[qtype] = NULL; 1482 return 1; 1483 } 1484 #endif 1485 1486 static int parse_options(char *options, struct super_block *sb, 1487 unsigned long *journal_devnum, 1488 unsigned int *journal_ioprio, 1489 ext4_fsblk_t *n_blocks_count, int is_remount) 1490 { 1491 struct ext4_sb_info *sbi = EXT4_SB(sb); 1492 char *p; 1493 substring_t args[MAX_OPT_ARGS]; 1494 int data_opt = 0; 1495 int option; 1496 #ifdef CONFIG_QUOTA 1497 int qfmt; 1498 #endif 1499 1500 if (!options) 1501 return 1; 1502 1503 while ((p = strsep(&options, ",")) != NULL) { 1504 int token; 1505 if (!*p) 1506 continue; 1507 1508 /* 1509 * Initialize args struct so we know whether arg was 1510 * found; some options take optional arguments. 1511 */ 1512 args[0].to = args[0].from = NULL; 1513 token = match_token(p, tokens, args); 1514 switch (token) { 1515 case Opt_bsd_df: 1516 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1517 clear_opt(sb, MINIX_DF); 1518 break; 1519 case Opt_minix_df: 1520 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1521 set_opt(sb, MINIX_DF); 1522 1523 break; 1524 case Opt_grpid: 1525 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1526 set_opt(sb, GRPID); 1527 1528 break; 1529 case Opt_nogrpid: 1530 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); 1531 clear_opt(sb, GRPID); 1532 1533 break; 1534 case Opt_resuid: 1535 if (match_int(&args[0], &option)) 1536 return 0; 1537 sbi->s_resuid = option; 1538 break; 1539 case Opt_resgid: 1540 if (match_int(&args[0], &option)) 1541 return 0; 1542 sbi->s_resgid = option; 1543 break; 1544 case Opt_sb: 1545 /* handled by get_sb_block() instead of here */ 1546 /* *sb_block = match_int(&args[0]); */ 1547 break; 1548 case Opt_err_panic: 1549 clear_opt(sb, ERRORS_CONT); 1550 clear_opt(sb, ERRORS_RO); 1551 set_opt(sb, ERRORS_PANIC); 1552 break; 1553 case Opt_err_ro: 1554 clear_opt(sb, ERRORS_CONT); 1555 clear_opt(sb, ERRORS_PANIC); 1556 set_opt(sb, ERRORS_RO); 1557 break; 1558 case Opt_err_cont: 1559 clear_opt(sb, ERRORS_RO); 1560 clear_opt(sb, ERRORS_PANIC); 1561 set_opt(sb, ERRORS_CONT); 1562 break; 1563 case Opt_nouid32: 1564 set_opt(sb, NO_UID32); 1565 break; 1566 case Opt_debug: 1567 set_opt(sb, DEBUG); 1568 break; 1569 case Opt_oldalloc: 1570 set_opt(sb, OLDALLOC); 1571 break; 1572 case Opt_orlov: 1573 clear_opt(sb, OLDALLOC); 1574 break; 1575 #ifdef CONFIG_EXT4_FS_XATTR 1576 case Opt_user_xattr: 1577 set_opt(sb, XATTR_USER); 1578 break; 1579 case Opt_nouser_xattr: 1580 clear_opt(sb, XATTR_USER); 1581 break; 1582 #else 1583 case Opt_user_xattr: 1584 case Opt_nouser_xattr: 1585 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); 1586 break; 1587 #endif 1588 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1589 case Opt_acl: 1590 set_opt(sb, POSIX_ACL); 1591 break; 1592 case Opt_noacl: 1593 clear_opt(sb, POSIX_ACL); 1594 break; 1595 #else 1596 case Opt_acl: 1597 case Opt_noacl: 1598 ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); 1599 break; 1600 #endif 1601 case Opt_journal_update: 1602 /* @@@ FIXME */ 1603 /* Eventually we will want to be able to create 1604 a journal file here. For now, only allow the 1605 user to specify an existing inode to be the 1606 journal file. */ 1607 if (is_remount) { 1608 ext4_msg(sb, KERN_ERR, 1609 "Cannot specify journal on remount"); 1610 return 0; 1611 } 1612 set_opt(sb, UPDATE_JOURNAL); 1613 break; 1614 case Opt_journal_dev: 1615 if (is_remount) { 1616 ext4_msg(sb, KERN_ERR, 1617 "Cannot specify journal on remount"); 1618 return 0; 1619 } 1620 if (match_int(&args[0], &option)) 1621 return 0; 1622 *journal_devnum = option; 1623 break; 1624 case Opt_journal_checksum: 1625 set_opt(sb, JOURNAL_CHECKSUM); 1626 break; 1627 case Opt_journal_async_commit: 1628 set_opt(sb, JOURNAL_ASYNC_COMMIT); 1629 set_opt(sb, JOURNAL_CHECKSUM); 1630 break; 1631 case Opt_noload: 1632 set_opt(sb, NOLOAD); 1633 break; 1634 case Opt_commit: 1635 if (match_int(&args[0], &option)) 1636 return 0; 1637 if (option < 0) 1638 return 0; 1639 if (option == 0) 1640 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1641 sbi->s_commit_interval = HZ * option; 1642 break; 1643 case Opt_max_batch_time: 1644 if (match_int(&args[0], &option)) 1645 return 0; 1646 if (option < 0) 1647 return 0; 1648 if (option == 0) 1649 option = EXT4_DEF_MAX_BATCH_TIME; 1650 sbi->s_max_batch_time = option; 1651 break; 1652 case Opt_min_batch_time: 1653 if (match_int(&args[0], &option)) 1654 return 0; 1655 if (option < 0) 1656 return 0; 1657 sbi->s_min_batch_time = option; 1658 break; 1659 case Opt_data_journal: 1660 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1661 goto datacheck; 1662 case Opt_data_ordered: 1663 data_opt = EXT4_MOUNT_ORDERED_DATA; 1664 goto datacheck; 1665 case Opt_data_writeback: 1666 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1667 datacheck: 1668 if (is_remount) { 1669 if (test_opt(sb, DATA_FLAGS) != data_opt) { 1670 ext4_msg(sb, KERN_ERR, 1671 "Cannot change data mode on remount"); 1672 return 0; 1673 } 1674 } else { 1675 clear_opt(sb, DATA_FLAGS); 1676 sbi->s_mount_opt |= data_opt; 1677 } 1678 break; 1679 case Opt_data_err_abort: 1680 set_opt(sb, DATA_ERR_ABORT); 1681 break; 1682 case Opt_data_err_ignore: 1683 clear_opt(sb, DATA_ERR_ABORT); 1684 break; 1685 #ifdef CONFIG_QUOTA 1686 case Opt_usrjquota: 1687 if (!set_qf_name(sb, USRQUOTA, &args[0])) 1688 return 0; 1689 break; 1690 case Opt_grpjquota: 1691 if (!set_qf_name(sb, GRPQUOTA, &args[0])) 1692 return 0; 1693 break; 1694 case Opt_offusrjquota: 1695 if (!clear_qf_name(sb, USRQUOTA)) 1696 return 0; 1697 break; 1698 case Opt_offgrpjquota: 1699 if (!clear_qf_name(sb, GRPQUOTA)) 1700 return 0; 1701 break; 1702 1703 case Opt_jqfmt_vfsold: 1704 qfmt = QFMT_VFS_OLD; 1705 goto set_qf_format; 1706 case Opt_jqfmt_vfsv0: 1707 qfmt = QFMT_VFS_V0; 1708 goto set_qf_format; 1709 case Opt_jqfmt_vfsv1: 1710 qfmt = QFMT_VFS_V1; 1711 set_qf_format: 1712 if (sb_any_quota_loaded(sb) && 1713 sbi->s_jquota_fmt != qfmt) { 1714 ext4_msg(sb, KERN_ERR, "Cannot change " 1715 "journaled quota options when " 1716 "quota turned on"); 1717 return 0; 1718 } 1719 sbi->s_jquota_fmt = qfmt; 1720 break; 1721 case Opt_quota: 1722 case Opt_usrquota: 1723 set_opt(sb, QUOTA); 1724 set_opt(sb, USRQUOTA); 1725 break; 1726 case Opt_grpquota: 1727 set_opt(sb, QUOTA); 1728 set_opt(sb, GRPQUOTA); 1729 break; 1730 case Opt_noquota: 1731 if (sb_any_quota_loaded(sb)) { 1732 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1733 "options when quota turned on"); 1734 return 0; 1735 } 1736 clear_opt(sb, QUOTA); 1737 clear_opt(sb, USRQUOTA); 1738 clear_opt(sb, GRPQUOTA); 1739 break; 1740 #else 1741 case Opt_quota: 1742 case Opt_usrquota: 1743 case Opt_grpquota: 1744 ext4_msg(sb, KERN_ERR, 1745 "quota options not supported"); 1746 break; 1747 case Opt_usrjquota: 1748 case Opt_grpjquota: 1749 case Opt_offusrjquota: 1750 case Opt_offgrpjquota: 1751 case Opt_jqfmt_vfsold: 1752 case Opt_jqfmt_vfsv0: 1753 case Opt_jqfmt_vfsv1: 1754 ext4_msg(sb, KERN_ERR, 1755 "journaled quota options not supported"); 1756 break; 1757 case Opt_noquota: 1758 break; 1759 #endif 1760 case Opt_abort: 1761 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1762 break; 1763 case Opt_nobarrier: 1764 clear_opt(sb, BARRIER); 1765 break; 1766 case Opt_barrier: 1767 if (args[0].from) { 1768 if (match_int(&args[0], &option)) 1769 return 0; 1770 } else 1771 option = 1; /* No argument, default to 1 */ 1772 if (option) 1773 set_opt(sb, BARRIER); 1774 else 1775 clear_opt(sb, BARRIER); 1776 break; 1777 case Opt_ignore: 1778 break; 1779 case Opt_resize: 1780 if (!is_remount) { 1781 ext4_msg(sb, KERN_ERR, 1782 "resize option only available " 1783 "for remount"); 1784 return 0; 1785 } 1786 if (match_int(&args[0], &option) != 0) 1787 return 0; 1788 *n_blocks_count = option; 1789 break; 1790 case Opt_nobh: 1791 ext4_msg(sb, KERN_WARNING, 1792 "Ignoring deprecated nobh option"); 1793 break; 1794 case Opt_bh: 1795 ext4_msg(sb, KERN_WARNING, 1796 "Ignoring deprecated bh option"); 1797 break; 1798 case Opt_i_version: 1799 set_opt(sb, I_VERSION); 1800 sb->s_flags |= MS_I_VERSION; 1801 break; 1802 case Opt_nodelalloc: 1803 clear_opt(sb, DELALLOC); 1804 break; 1805 case Opt_mblk_io_submit: 1806 set_opt(sb, MBLK_IO_SUBMIT); 1807 break; 1808 case Opt_nomblk_io_submit: 1809 clear_opt(sb, MBLK_IO_SUBMIT); 1810 break; 1811 case Opt_stripe: 1812 if (match_int(&args[0], &option)) 1813 return 0; 1814 if (option < 0) 1815 return 0; 1816 sbi->s_stripe = option; 1817 break; 1818 case Opt_delalloc: 1819 set_opt(sb, DELALLOC); 1820 break; 1821 case Opt_block_validity: 1822 set_opt(sb, BLOCK_VALIDITY); 1823 break; 1824 case Opt_noblock_validity: 1825 clear_opt(sb, BLOCK_VALIDITY); 1826 break; 1827 case Opt_inode_readahead_blks: 1828 if (match_int(&args[0], &option)) 1829 return 0; 1830 if (option < 0 || option > (1 << 30)) 1831 return 0; 1832 if (option && !is_power_of_2(option)) { 1833 ext4_msg(sb, KERN_ERR, 1834 "EXT4-fs: inode_readahead_blks" 1835 " must be a power of 2"); 1836 return 0; 1837 } 1838 sbi->s_inode_readahead_blks = option; 1839 break; 1840 case Opt_journal_ioprio: 1841 if (match_int(&args[0], &option)) 1842 return 0; 1843 if (option < 0 || option > 7) 1844 break; 1845 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 1846 option); 1847 break; 1848 case Opt_noauto_da_alloc: 1849 set_opt(sb, NO_AUTO_DA_ALLOC); 1850 break; 1851 case Opt_auto_da_alloc: 1852 if (args[0].from) { 1853 if (match_int(&args[0], &option)) 1854 return 0; 1855 } else 1856 option = 1; /* No argument, default to 1 */ 1857 if (option) 1858 clear_opt(sb, NO_AUTO_DA_ALLOC); 1859 else 1860 set_opt(sb,NO_AUTO_DA_ALLOC); 1861 break; 1862 case Opt_discard: 1863 set_opt(sb, DISCARD); 1864 break; 1865 case Opt_nodiscard: 1866 clear_opt(sb, DISCARD); 1867 break; 1868 case Opt_dioread_nolock: 1869 set_opt(sb, DIOREAD_NOLOCK); 1870 break; 1871 case Opt_dioread_lock: 1872 clear_opt(sb, DIOREAD_NOLOCK); 1873 break; 1874 case Opt_init_inode_table: 1875 set_opt(sb, INIT_INODE_TABLE); 1876 if (args[0].from) { 1877 if (match_int(&args[0], &option)) 1878 return 0; 1879 } else 1880 option = EXT4_DEF_LI_WAIT_MULT; 1881 if (option < 0) 1882 return 0; 1883 sbi->s_li_wait_mult = option; 1884 break; 1885 case Opt_noinit_inode_table: 1886 clear_opt(sb, INIT_INODE_TABLE); 1887 break; 1888 default: 1889 ext4_msg(sb, KERN_ERR, 1890 "Unrecognized mount option \"%s\" " 1891 "or missing value", p); 1892 return 0; 1893 } 1894 } 1895 #ifdef CONFIG_QUOTA 1896 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1897 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1898 clear_opt(sb, USRQUOTA); 1899 1900 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1901 clear_opt(sb, GRPQUOTA); 1902 1903 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1904 ext4_msg(sb, KERN_ERR, "old and new quota " 1905 "format mixing"); 1906 return 0; 1907 } 1908 1909 if (!sbi->s_jquota_fmt) { 1910 ext4_msg(sb, KERN_ERR, "journaled quota format " 1911 "not specified"); 1912 return 0; 1913 } 1914 } else { 1915 if (sbi->s_jquota_fmt) { 1916 ext4_msg(sb, KERN_ERR, "journaled quota format " 1917 "specified with no journaling " 1918 "enabled"); 1919 return 0; 1920 } 1921 } 1922 #endif 1923 return 1; 1924 } 1925 1926 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1927 int read_only) 1928 { 1929 struct ext4_sb_info *sbi = EXT4_SB(sb); 1930 int res = 0; 1931 1932 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1933 ext4_msg(sb, KERN_ERR, "revision level too high, " 1934 "forcing read-only mode"); 1935 res = MS_RDONLY; 1936 } 1937 if (read_only) 1938 return res; 1939 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1940 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1941 "running e2fsck is recommended"); 1942 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1943 ext4_msg(sb, KERN_WARNING, 1944 "warning: mounting fs with errors, " 1945 "running e2fsck is recommended"); 1946 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 1947 le16_to_cpu(es->s_mnt_count) >= 1948 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1949 ext4_msg(sb, KERN_WARNING, 1950 "warning: maximal mount count reached, " 1951 "running e2fsck is recommended"); 1952 else if (le32_to_cpu(es->s_checkinterval) && 1953 (le32_to_cpu(es->s_lastcheck) + 1954 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1955 ext4_msg(sb, KERN_WARNING, 1956 "warning: checktime reached, " 1957 "running e2fsck is recommended"); 1958 if (!sbi->s_journal) 1959 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1960 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1961 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1962 le16_add_cpu(&es->s_mnt_count, 1); 1963 es->s_mtime = cpu_to_le32(get_seconds()); 1964 ext4_update_dynamic_rev(sb); 1965 if (sbi->s_journal) 1966 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1967 1968 ext4_commit_super(sb, 1); 1969 if (test_opt(sb, DEBUG)) 1970 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1971 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 1972 sb->s_blocksize, 1973 sbi->s_groups_count, 1974 EXT4_BLOCKS_PER_GROUP(sb), 1975 EXT4_INODES_PER_GROUP(sb), 1976 sbi->s_mount_opt, sbi->s_mount_opt2); 1977 1978 cleancache_init_fs(sb); 1979 return res; 1980 } 1981 1982 static int ext4_fill_flex_info(struct super_block *sb) 1983 { 1984 struct ext4_sb_info *sbi = EXT4_SB(sb); 1985 struct ext4_group_desc *gdp = NULL; 1986 ext4_group_t flex_group_count; 1987 ext4_group_t flex_group; 1988 int groups_per_flex = 0; 1989 size_t size; 1990 int i; 1991 1992 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1993 groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1994 1995 if (groups_per_flex < 2) { 1996 sbi->s_log_groups_per_flex = 0; 1997 return 1; 1998 } 1999 2000 /* We allocate both existing and potentially added groups */ 2001 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 2002 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 2003 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 2004 size = flex_group_count * sizeof(struct flex_groups); 2005 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL); 2006 if (sbi->s_flex_groups == NULL) { 2007 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups", 2008 flex_group_count); 2009 goto failed; 2010 } 2011 2012 for (i = 0; i < sbi->s_groups_count; i++) { 2013 gdp = ext4_get_group_desc(sb, i, NULL); 2014 2015 flex_group = ext4_flex_group(sbi, i); 2016 atomic_add(ext4_free_inodes_count(sb, gdp), 2017 &sbi->s_flex_groups[flex_group].free_inodes); 2018 atomic_add(ext4_free_blks_count(sb, gdp), 2019 &sbi->s_flex_groups[flex_group].free_blocks); 2020 atomic_add(ext4_used_dirs_count(sb, gdp), 2021 &sbi->s_flex_groups[flex_group].used_dirs); 2022 } 2023 2024 return 1; 2025 failed: 2026 return 0; 2027 } 2028 2029 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 2030 struct ext4_group_desc *gdp) 2031 { 2032 __u16 crc = 0; 2033 2034 if (sbi->s_es->s_feature_ro_compat & 2035 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 2036 int offset = offsetof(struct ext4_group_desc, bg_checksum); 2037 __le32 le_group = cpu_to_le32(block_group); 2038 2039 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 2040 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 2041 crc = crc16(crc, (__u8 *)gdp, offset); 2042 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 2043 /* for checksum of struct ext4_group_desc do the rest...*/ 2044 if ((sbi->s_es->s_feature_incompat & 2045 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 2046 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 2047 crc = crc16(crc, (__u8 *)gdp + offset, 2048 le16_to_cpu(sbi->s_es->s_desc_size) - 2049 offset); 2050 } 2051 2052 return cpu_to_le16(crc); 2053 } 2054 2055 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 2056 struct ext4_group_desc *gdp) 2057 { 2058 if ((sbi->s_es->s_feature_ro_compat & 2059 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 2060 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 2061 return 0; 2062 2063 return 1; 2064 } 2065 2066 /* Called at mount-time, super-block is locked */ 2067 static int ext4_check_descriptors(struct super_block *sb, 2068 ext4_group_t *first_not_zeroed) 2069 { 2070 struct ext4_sb_info *sbi = EXT4_SB(sb); 2071 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 2072 ext4_fsblk_t last_block; 2073 ext4_fsblk_t block_bitmap; 2074 ext4_fsblk_t inode_bitmap; 2075 ext4_fsblk_t inode_table; 2076 int flexbg_flag = 0; 2077 ext4_group_t i, grp = sbi->s_groups_count; 2078 2079 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2080 flexbg_flag = 1; 2081 2082 ext4_debug("Checking group descriptors"); 2083 2084 for (i = 0; i < sbi->s_groups_count; i++) { 2085 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2086 2087 if (i == sbi->s_groups_count - 1 || flexbg_flag) 2088 last_block = ext4_blocks_count(sbi->s_es) - 1; 2089 else 2090 last_block = first_block + 2091 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2092 2093 if ((grp == sbi->s_groups_count) && 2094 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2095 grp = i; 2096 2097 block_bitmap = ext4_block_bitmap(sb, gdp); 2098 if (block_bitmap < first_block || block_bitmap > last_block) { 2099 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2100 "Block bitmap for group %u not in group " 2101 "(block %llu)!", i, block_bitmap); 2102 return 0; 2103 } 2104 inode_bitmap = ext4_inode_bitmap(sb, gdp); 2105 if (inode_bitmap < first_block || inode_bitmap > last_block) { 2106 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2107 "Inode bitmap for group %u not in group " 2108 "(block %llu)!", i, inode_bitmap); 2109 return 0; 2110 } 2111 inode_table = ext4_inode_table(sb, gdp); 2112 if (inode_table < first_block || 2113 inode_table + sbi->s_itb_per_group - 1 > last_block) { 2114 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2115 "Inode table for group %u not in group " 2116 "(block %llu)!", i, inode_table); 2117 return 0; 2118 } 2119 ext4_lock_group(sb, i); 2120 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 2121 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2122 "Checksum for group %u failed (%u!=%u)", 2123 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 2124 gdp)), le16_to_cpu(gdp->bg_checksum)); 2125 if (!(sb->s_flags & MS_RDONLY)) { 2126 ext4_unlock_group(sb, i); 2127 return 0; 2128 } 2129 } 2130 ext4_unlock_group(sb, i); 2131 if (!flexbg_flag) 2132 first_block += EXT4_BLOCKS_PER_GROUP(sb); 2133 } 2134 if (NULL != first_not_zeroed) 2135 *first_not_zeroed = grp; 2136 2137 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 2138 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 2139 return 1; 2140 } 2141 2142 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2143 * the superblock) which were deleted from all directories, but held open by 2144 * a process at the time of a crash. We walk the list and try to delete these 2145 * inodes at recovery time (only with a read-write filesystem). 2146 * 2147 * In order to keep the orphan inode chain consistent during traversal (in 2148 * case of crash during recovery), we link each inode into the superblock 2149 * orphan list_head and handle it the same way as an inode deletion during 2150 * normal operation (which journals the operations for us). 2151 * 2152 * We only do an iget() and an iput() on each inode, which is very safe if we 2153 * accidentally point at an in-use or already deleted inode. The worst that 2154 * can happen in this case is that we get a "bit already cleared" message from 2155 * ext4_free_inode(). The only reason we would point at a wrong inode is if 2156 * e2fsck was run on this filesystem, and it must have already done the orphan 2157 * inode cleanup for us, so we can safely abort without any further action. 2158 */ 2159 static void ext4_orphan_cleanup(struct super_block *sb, 2160 struct ext4_super_block *es) 2161 { 2162 unsigned int s_flags = sb->s_flags; 2163 int nr_orphans = 0, nr_truncates = 0; 2164 #ifdef CONFIG_QUOTA 2165 int i; 2166 #endif 2167 if (!es->s_last_orphan) { 2168 jbd_debug(4, "no orphan inodes to clean up\n"); 2169 return; 2170 } 2171 2172 if (bdev_read_only(sb->s_bdev)) { 2173 ext4_msg(sb, KERN_ERR, "write access " 2174 "unavailable, skipping orphan cleanup"); 2175 return; 2176 } 2177 2178 /* Check if feature set would not allow a r/w mount */ 2179 if (!ext4_feature_set_ok(sb, 0)) { 2180 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2181 "unknown ROCOMPAT features"); 2182 return; 2183 } 2184 2185 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2186 if (es->s_last_orphan) 2187 jbd_debug(1, "Errors on filesystem, " 2188 "clearing orphan list.\n"); 2189 es->s_last_orphan = 0; 2190 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2191 return; 2192 } 2193 2194 if (s_flags & MS_RDONLY) { 2195 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2196 sb->s_flags &= ~MS_RDONLY; 2197 } 2198 #ifdef CONFIG_QUOTA 2199 /* Needed for iput() to work correctly and not trash data */ 2200 sb->s_flags |= MS_ACTIVE; 2201 /* Turn on quotas so that they are updated correctly */ 2202 for (i = 0; i < MAXQUOTAS; i++) { 2203 if (EXT4_SB(sb)->s_qf_names[i]) { 2204 int ret = ext4_quota_on_mount(sb, i); 2205 if (ret < 0) 2206 ext4_msg(sb, KERN_ERR, 2207 "Cannot turn on journaled " 2208 "quota: error %d", ret); 2209 } 2210 } 2211 #endif 2212 2213 while (es->s_last_orphan) { 2214 struct inode *inode; 2215 2216 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 2217 if (IS_ERR(inode)) { 2218 es->s_last_orphan = 0; 2219 break; 2220 } 2221 2222 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2223 dquot_initialize(inode); 2224 if (inode->i_nlink) { 2225 ext4_msg(sb, KERN_DEBUG, 2226 "%s: truncating inode %lu to %lld bytes", 2227 __func__, inode->i_ino, inode->i_size); 2228 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2229 inode->i_ino, inode->i_size); 2230 ext4_truncate(inode); 2231 nr_truncates++; 2232 } else { 2233 ext4_msg(sb, KERN_DEBUG, 2234 "%s: deleting unreferenced inode %lu", 2235 __func__, inode->i_ino); 2236 jbd_debug(2, "deleting unreferenced inode %lu\n", 2237 inode->i_ino); 2238 nr_orphans++; 2239 } 2240 iput(inode); /* The delete magic happens here! */ 2241 } 2242 2243 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2244 2245 if (nr_orphans) 2246 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2247 PLURAL(nr_orphans)); 2248 if (nr_truncates) 2249 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2250 PLURAL(nr_truncates)); 2251 #ifdef CONFIG_QUOTA 2252 /* Turn quotas off */ 2253 for (i = 0; i < MAXQUOTAS; i++) { 2254 if (sb_dqopt(sb)->files[i]) 2255 dquot_quota_off(sb, i); 2256 } 2257 #endif 2258 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2259 } 2260 2261 /* 2262 * Maximal extent format file size. 2263 * Resulting logical blkno at s_maxbytes must fit in our on-disk 2264 * extent format containers, within a sector_t, and within i_blocks 2265 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2266 * so that won't be a limiting factor. 2267 * 2268 * However there is other limiting factor. We do store extents in the form 2269 * of starting block and length, hence the resulting length of the extent 2270 * covering maximum file size must fit into on-disk format containers as 2271 * well. Given that length is always by 1 unit bigger than max unit (because 2272 * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2273 * 2274 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2275 */ 2276 static loff_t ext4_max_size(int blkbits, int has_huge_files) 2277 { 2278 loff_t res; 2279 loff_t upper_limit = MAX_LFS_FILESIZE; 2280 2281 /* small i_blocks in vfs inode? */ 2282 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2283 /* 2284 * CONFIG_LBDAF is not enabled implies the inode 2285 * i_block represent total blocks in 512 bytes 2286 * 32 == size of vfs inode i_blocks * 8 2287 */ 2288 upper_limit = (1LL << 32) - 1; 2289 2290 /* total blocks in file system block size */ 2291 upper_limit >>= (blkbits - 9); 2292 upper_limit <<= blkbits; 2293 } 2294 2295 /* 2296 * 32-bit extent-start container, ee_block. We lower the maxbytes 2297 * by one fs block, so ee_len can cover the extent of maximum file 2298 * size 2299 */ 2300 res = (1LL << 32) - 1; 2301 res <<= blkbits; 2302 2303 /* Sanity check against vm- & vfs- imposed limits */ 2304 if (res > upper_limit) 2305 res = upper_limit; 2306 2307 return res; 2308 } 2309 2310 /* 2311 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 2312 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 2313 * We need to be 1 filesystem block less than the 2^48 sector limit. 2314 */ 2315 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2316 { 2317 loff_t res = EXT4_NDIR_BLOCKS; 2318 int meta_blocks; 2319 loff_t upper_limit; 2320 /* This is calculated to be the largest file size for a dense, block 2321 * mapped file such that the file's total number of 512-byte sectors, 2322 * including data and all indirect blocks, does not exceed (2^48 - 1). 2323 * 2324 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2325 * number of 512-byte sectors of the file. 2326 */ 2327 2328 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2329 /* 2330 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2331 * the inode i_block field represents total file blocks in 2332 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2333 */ 2334 upper_limit = (1LL << 32) - 1; 2335 2336 /* total blocks in file system block size */ 2337 upper_limit >>= (bits - 9); 2338 2339 } else { 2340 /* 2341 * We use 48 bit ext4_inode i_blocks 2342 * With EXT4_HUGE_FILE_FL set the i_blocks 2343 * represent total number of blocks in 2344 * file system block size 2345 */ 2346 upper_limit = (1LL << 48) - 1; 2347 2348 } 2349 2350 /* indirect blocks */ 2351 meta_blocks = 1; 2352 /* double indirect blocks */ 2353 meta_blocks += 1 + (1LL << (bits-2)); 2354 /* tripple indirect blocks */ 2355 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2356 2357 upper_limit -= meta_blocks; 2358 upper_limit <<= bits; 2359 2360 res += 1LL << (bits-2); 2361 res += 1LL << (2*(bits-2)); 2362 res += 1LL << (3*(bits-2)); 2363 res <<= bits; 2364 if (res > upper_limit) 2365 res = upper_limit; 2366 2367 if (res > MAX_LFS_FILESIZE) 2368 res = MAX_LFS_FILESIZE; 2369 2370 return res; 2371 } 2372 2373 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2374 ext4_fsblk_t logical_sb_block, int nr) 2375 { 2376 struct ext4_sb_info *sbi = EXT4_SB(sb); 2377 ext4_group_t bg, first_meta_bg; 2378 int has_super = 0; 2379 2380 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2381 2382 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2383 nr < first_meta_bg) 2384 return logical_sb_block + nr + 1; 2385 bg = sbi->s_desc_per_block * nr; 2386 if (ext4_bg_has_super(sb, bg)) 2387 has_super = 1; 2388 2389 return (has_super + ext4_group_first_block_no(sb, bg)); 2390 } 2391 2392 /** 2393 * ext4_get_stripe_size: Get the stripe size. 2394 * @sbi: In memory super block info 2395 * 2396 * If we have specified it via mount option, then 2397 * use the mount option value. If the value specified at mount time is 2398 * greater than the blocks per group use the super block value. 2399 * If the super block value is greater than blocks per group return 0. 2400 * Allocator needs it be less than blocks per group. 2401 * 2402 */ 2403 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2404 { 2405 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2406 unsigned long stripe_width = 2407 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2408 int ret; 2409 2410 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2411 ret = sbi->s_stripe; 2412 else if (stripe_width <= sbi->s_blocks_per_group) 2413 ret = stripe_width; 2414 else if (stride <= sbi->s_blocks_per_group) 2415 ret = stride; 2416 else 2417 ret = 0; 2418 2419 /* 2420 * If the stripe width is 1, this makes no sense and 2421 * we set it to 0 to turn off stripe handling code. 2422 */ 2423 if (ret <= 1) 2424 ret = 0; 2425 2426 return ret; 2427 } 2428 2429 /* sysfs supprt */ 2430 2431 struct ext4_attr { 2432 struct attribute attr; 2433 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 2434 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 2435 const char *, size_t); 2436 int offset; 2437 }; 2438 2439 static int parse_strtoul(const char *buf, 2440 unsigned long max, unsigned long *value) 2441 { 2442 char *endp; 2443 2444 *value = simple_strtoul(skip_spaces(buf), &endp, 0); 2445 endp = skip_spaces(endp); 2446 if (*endp || *value > max) 2447 return -EINVAL; 2448 2449 return 0; 2450 } 2451 2452 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 2453 struct ext4_sb_info *sbi, 2454 char *buf) 2455 { 2456 return snprintf(buf, PAGE_SIZE, "%llu\n", 2457 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); 2458 } 2459 2460 static ssize_t session_write_kbytes_show(struct ext4_attr *a, 2461 struct ext4_sb_info *sbi, char *buf) 2462 { 2463 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2464 2465 if (!sb->s_bdev->bd_part) 2466 return snprintf(buf, PAGE_SIZE, "0\n"); 2467 return snprintf(buf, PAGE_SIZE, "%lu\n", 2468 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2469 sbi->s_sectors_written_start) >> 1); 2470 } 2471 2472 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 2473 struct ext4_sb_info *sbi, char *buf) 2474 { 2475 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2476 2477 if (!sb->s_bdev->bd_part) 2478 return snprintf(buf, PAGE_SIZE, "0\n"); 2479 return snprintf(buf, PAGE_SIZE, "%llu\n", 2480 (unsigned long long)(sbi->s_kbytes_written + 2481 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2482 EXT4_SB(sb)->s_sectors_written_start) >> 1))); 2483 } 2484 2485 static ssize_t extent_cache_hits_show(struct ext4_attr *a, 2486 struct ext4_sb_info *sbi, char *buf) 2487 { 2488 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits); 2489 } 2490 2491 static ssize_t extent_cache_misses_show(struct ext4_attr *a, 2492 struct ext4_sb_info *sbi, char *buf) 2493 { 2494 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses); 2495 } 2496 2497 static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 2498 struct ext4_sb_info *sbi, 2499 const char *buf, size_t count) 2500 { 2501 unsigned long t; 2502 2503 if (parse_strtoul(buf, 0x40000000, &t)) 2504 return -EINVAL; 2505 2506 if (t && !is_power_of_2(t)) 2507 return -EINVAL; 2508 2509 sbi->s_inode_readahead_blks = t; 2510 return count; 2511 } 2512 2513 static ssize_t sbi_ui_show(struct ext4_attr *a, 2514 struct ext4_sb_info *sbi, char *buf) 2515 { 2516 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2517 2518 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 2519 } 2520 2521 static ssize_t sbi_ui_store(struct ext4_attr *a, 2522 struct ext4_sb_info *sbi, 2523 const char *buf, size_t count) 2524 { 2525 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2526 unsigned long t; 2527 2528 if (parse_strtoul(buf, 0xffffffff, &t)) 2529 return -EINVAL; 2530 *ui = t; 2531 return count; 2532 } 2533 2534 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 2535 static struct ext4_attr ext4_attr_##_name = { \ 2536 .attr = {.name = __stringify(_name), .mode = _mode }, \ 2537 .show = _show, \ 2538 .store = _store, \ 2539 .offset = offsetof(struct ext4_sb_info, _elname), \ 2540 } 2541 #define EXT4_ATTR(name, mode, show, store) \ 2542 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 2543 2544 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) 2545 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 2546 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 2547 #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 2548 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 2549 #define ATTR_LIST(name) &ext4_attr_##name.attr 2550 2551 EXT4_RO_ATTR(delayed_allocation_blocks); 2552 EXT4_RO_ATTR(session_write_kbytes); 2553 EXT4_RO_ATTR(lifetime_write_kbytes); 2554 EXT4_RO_ATTR(extent_cache_hits); 2555 EXT4_RO_ATTR(extent_cache_misses); 2556 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 2557 inode_readahead_blks_store, s_inode_readahead_blks); 2558 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 2559 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 2560 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 2561 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 2562 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 2563 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 2564 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 2565 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); 2566 2567 static struct attribute *ext4_attrs[] = { 2568 ATTR_LIST(delayed_allocation_blocks), 2569 ATTR_LIST(session_write_kbytes), 2570 ATTR_LIST(lifetime_write_kbytes), 2571 ATTR_LIST(extent_cache_hits), 2572 ATTR_LIST(extent_cache_misses), 2573 ATTR_LIST(inode_readahead_blks), 2574 ATTR_LIST(inode_goal), 2575 ATTR_LIST(mb_stats), 2576 ATTR_LIST(mb_max_to_scan), 2577 ATTR_LIST(mb_min_to_scan), 2578 ATTR_LIST(mb_order2_req), 2579 ATTR_LIST(mb_stream_req), 2580 ATTR_LIST(mb_group_prealloc), 2581 ATTR_LIST(max_writeback_mb_bump), 2582 NULL, 2583 }; 2584 2585 /* Features this copy of ext4 supports */ 2586 EXT4_INFO_ATTR(lazy_itable_init); 2587 EXT4_INFO_ATTR(batched_discard); 2588 2589 static struct attribute *ext4_feat_attrs[] = { 2590 ATTR_LIST(lazy_itable_init), 2591 ATTR_LIST(batched_discard), 2592 NULL, 2593 }; 2594 2595 static ssize_t ext4_attr_show(struct kobject *kobj, 2596 struct attribute *attr, char *buf) 2597 { 2598 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2599 s_kobj); 2600 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2601 2602 return a->show ? a->show(a, sbi, buf) : 0; 2603 } 2604 2605 static ssize_t ext4_attr_store(struct kobject *kobj, 2606 struct attribute *attr, 2607 const char *buf, size_t len) 2608 { 2609 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2610 s_kobj); 2611 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2612 2613 return a->store ? a->store(a, sbi, buf, len) : 0; 2614 } 2615 2616 static void ext4_sb_release(struct kobject *kobj) 2617 { 2618 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2619 s_kobj); 2620 complete(&sbi->s_kobj_unregister); 2621 } 2622 2623 static const struct sysfs_ops ext4_attr_ops = { 2624 .show = ext4_attr_show, 2625 .store = ext4_attr_store, 2626 }; 2627 2628 static struct kobj_type ext4_ktype = { 2629 .default_attrs = ext4_attrs, 2630 .sysfs_ops = &ext4_attr_ops, 2631 .release = ext4_sb_release, 2632 }; 2633 2634 static void ext4_feat_release(struct kobject *kobj) 2635 { 2636 complete(&ext4_feat->f_kobj_unregister); 2637 } 2638 2639 static struct kobj_type ext4_feat_ktype = { 2640 .default_attrs = ext4_feat_attrs, 2641 .sysfs_ops = &ext4_attr_ops, 2642 .release = ext4_feat_release, 2643 }; 2644 2645 /* 2646 * Check whether this filesystem can be mounted based on 2647 * the features present and the RDONLY/RDWR mount requested. 2648 * Returns 1 if this filesystem can be mounted as requested, 2649 * 0 if it cannot be. 2650 */ 2651 static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2652 { 2653 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2654 ext4_msg(sb, KERN_ERR, 2655 "Couldn't mount because of " 2656 "unsupported optional features (%x)", 2657 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2658 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2659 return 0; 2660 } 2661 2662 if (readonly) 2663 return 1; 2664 2665 /* Check that feature set is OK for a read-write mount */ 2666 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2667 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2668 "unsupported optional features (%x)", 2669 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2670 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2671 return 0; 2672 } 2673 /* 2674 * Large file size enabled file system can only be mounted 2675 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2676 */ 2677 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2678 if (sizeof(blkcnt_t) < sizeof(u64)) { 2679 ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2680 "cannot be mounted RDWR without " 2681 "CONFIG_LBDAF"); 2682 return 0; 2683 } 2684 } 2685 return 1; 2686 } 2687 2688 /* 2689 * This function is called once a day if we have errors logged 2690 * on the file system 2691 */ 2692 static void print_daily_error_info(unsigned long arg) 2693 { 2694 struct super_block *sb = (struct super_block *) arg; 2695 struct ext4_sb_info *sbi; 2696 struct ext4_super_block *es; 2697 2698 sbi = EXT4_SB(sb); 2699 es = sbi->s_es; 2700 2701 if (es->s_error_count) 2702 ext4_msg(sb, KERN_NOTICE, "error count: %u", 2703 le32_to_cpu(es->s_error_count)); 2704 if (es->s_first_error_time) { 2705 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", 2706 sb->s_id, le32_to_cpu(es->s_first_error_time), 2707 (int) sizeof(es->s_first_error_func), 2708 es->s_first_error_func, 2709 le32_to_cpu(es->s_first_error_line)); 2710 if (es->s_first_error_ino) 2711 printk(": inode %u", 2712 le32_to_cpu(es->s_first_error_ino)); 2713 if (es->s_first_error_block) 2714 printk(": block %llu", (unsigned long long) 2715 le64_to_cpu(es->s_first_error_block)); 2716 printk("\n"); 2717 } 2718 if (es->s_last_error_time) { 2719 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", 2720 sb->s_id, le32_to_cpu(es->s_last_error_time), 2721 (int) sizeof(es->s_last_error_func), 2722 es->s_last_error_func, 2723 le32_to_cpu(es->s_last_error_line)); 2724 if (es->s_last_error_ino) 2725 printk(": inode %u", 2726 le32_to_cpu(es->s_last_error_ino)); 2727 if (es->s_last_error_block) 2728 printk(": block %llu", (unsigned long long) 2729 le64_to_cpu(es->s_last_error_block)); 2730 printk("\n"); 2731 } 2732 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 2733 } 2734 2735 /* Find next suitable group and run ext4_init_inode_table */ 2736 static int ext4_run_li_request(struct ext4_li_request *elr) 2737 { 2738 struct ext4_group_desc *gdp = NULL; 2739 ext4_group_t group, ngroups; 2740 struct super_block *sb; 2741 unsigned long timeout = 0; 2742 int ret = 0; 2743 2744 sb = elr->lr_super; 2745 ngroups = EXT4_SB(sb)->s_groups_count; 2746 2747 for (group = elr->lr_next_group; group < ngroups; group++) { 2748 gdp = ext4_get_group_desc(sb, group, NULL); 2749 if (!gdp) { 2750 ret = 1; 2751 break; 2752 } 2753 2754 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2755 break; 2756 } 2757 2758 if (group == ngroups) 2759 ret = 1; 2760 2761 if (!ret) { 2762 timeout = jiffies; 2763 ret = ext4_init_inode_table(sb, group, 2764 elr->lr_timeout ? 0 : 1); 2765 if (elr->lr_timeout == 0) { 2766 timeout = (jiffies - timeout) * 2767 elr->lr_sbi->s_li_wait_mult; 2768 elr->lr_timeout = timeout; 2769 } 2770 elr->lr_next_sched = jiffies + elr->lr_timeout; 2771 elr->lr_next_group = group + 1; 2772 } 2773 2774 return ret; 2775 } 2776 2777 /* 2778 * Remove lr_request from the list_request and free the 2779 * request structure. Should be called with li_list_mtx held 2780 */ 2781 static void ext4_remove_li_request(struct ext4_li_request *elr) 2782 { 2783 struct ext4_sb_info *sbi; 2784 2785 if (!elr) 2786 return; 2787 2788 sbi = elr->lr_sbi; 2789 2790 list_del(&elr->lr_request); 2791 sbi->s_li_request = NULL; 2792 kfree(elr); 2793 } 2794 2795 static void ext4_unregister_li_request(struct super_block *sb) 2796 { 2797 mutex_lock(&ext4_li_mtx); 2798 if (!ext4_li_info) { 2799 mutex_unlock(&ext4_li_mtx); 2800 return; 2801 } 2802 2803 mutex_lock(&ext4_li_info->li_list_mtx); 2804 ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2805 mutex_unlock(&ext4_li_info->li_list_mtx); 2806 mutex_unlock(&ext4_li_mtx); 2807 } 2808 2809 static struct task_struct *ext4_lazyinit_task; 2810 2811 /* 2812 * This is the function where ext4lazyinit thread lives. It walks 2813 * through the request list searching for next scheduled filesystem. 2814 * When such a fs is found, run the lazy initialization request 2815 * (ext4_rn_li_request) and keep track of the time spend in this 2816 * function. Based on that time we compute next schedule time of 2817 * the request. When walking through the list is complete, compute 2818 * next waking time and put itself into sleep. 2819 */ 2820 static int ext4_lazyinit_thread(void *arg) 2821 { 2822 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2823 struct list_head *pos, *n; 2824 struct ext4_li_request *elr; 2825 unsigned long next_wakeup, cur; 2826 2827 BUG_ON(NULL == eli); 2828 2829 cont_thread: 2830 while (true) { 2831 next_wakeup = MAX_JIFFY_OFFSET; 2832 2833 mutex_lock(&eli->li_list_mtx); 2834 if (list_empty(&eli->li_request_list)) { 2835 mutex_unlock(&eli->li_list_mtx); 2836 goto exit_thread; 2837 } 2838 2839 list_for_each_safe(pos, n, &eli->li_request_list) { 2840 elr = list_entry(pos, struct ext4_li_request, 2841 lr_request); 2842 2843 if (time_after_eq(jiffies, elr->lr_next_sched)) { 2844 if (ext4_run_li_request(elr) != 0) { 2845 /* error, remove the lazy_init job */ 2846 ext4_remove_li_request(elr); 2847 continue; 2848 } 2849 } 2850 2851 if (time_before(elr->lr_next_sched, next_wakeup)) 2852 next_wakeup = elr->lr_next_sched; 2853 } 2854 mutex_unlock(&eli->li_list_mtx); 2855 2856 if (freezing(current)) 2857 refrigerator(); 2858 2859 cur = jiffies; 2860 if ((time_after_eq(cur, next_wakeup)) || 2861 (MAX_JIFFY_OFFSET == next_wakeup)) { 2862 cond_resched(); 2863 continue; 2864 } 2865 2866 schedule_timeout_interruptible(next_wakeup - cur); 2867 2868 if (kthread_should_stop()) { 2869 ext4_clear_request_list(); 2870 goto exit_thread; 2871 } 2872 } 2873 2874 exit_thread: 2875 /* 2876 * It looks like the request list is empty, but we need 2877 * to check it under the li_list_mtx lock, to prevent any 2878 * additions into it, and of course we should lock ext4_li_mtx 2879 * to atomically free the list and ext4_li_info, because at 2880 * this point another ext4 filesystem could be registering 2881 * new one. 2882 */ 2883 mutex_lock(&ext4_li_mtx); 2884 mutex_lock(&eli->li_list_mtx); 2885 if (!list_empty(&eli->li_request_list)) { 2886 mutex_unlock(&eli->li_list_mtx); 2887 mutex_unlock(&ext4_li_mtx); 2888 goto cont_thread; 2889 } 2890 mutex_unlock(&eli->li_list_mtx); 2891 kfree(ext4_li_info); 2892 ext4_li_info = NULL; 2893 mutex_unlock(&ext4_li_mtx); 2894 2895 return 0; 2896 } 2897 2898 static void ext4_clear_request_list(void) 2899 { 2900 struct list_head *pos, *n; 2901 struct ext4_li_request *elr; 2902 2903 mutex_lock(&ext4_li_info->li_list_mtx); 2904 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 2905 elr = list_entry(pos, struct ext4_li_request, 2906 lr_request); 2907 ext4_remove_li_request(elr); 2908 } 2909 mutex_unlock(&ext4_li_info->li_list_mtx); 2910 } 2911 2912 static int ext4_run_lazyinit_thread(void) 2913 { 2914 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 2915 ext4_li_info, "ext4lazyinit"); 2916 if (IS_ERR(ext4_lazyinit_task)) { 2917 int err = PTR_ERR(ext4_lazyinit_task); 2918 ext4_clear_request_list(); 2919 kfree(ext4_li_info); 2920 ext4_li_info = NULL; 2921 printk(KERN_CRIT "EXT4: error %d creating inode table " 2922 "initialization thread\n", 2923 err); 2924 return err; 2925 } 2926 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 2927 return 0; 2928 } 2929 2930 /* 2931 * Check whether it make sense to run itable init. thread or not. 2932 * If there is at least one uninitialized inode table, return 2933 * corresponding group number, else the loop goes through all 2934 * groups and return total number of groups. 2935 */ 2936 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 2937 { 2938 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 2939 struct ext4_group_desc *gdp = NULL; 2940 2941 for (group = 0; group < ngroups; group++) { 2942 gdp = ext4_get_group_desc(sb, group, NULL); 2943 if (!gdp) 2944 continue; 2945 2946 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2947 break; 2948 } 2949 2950 return group; 2951 } 2952 2953 static int ext4_li_info_new(void) 2954 { 2955 struct ext4_lazy_init *eli = NULL; 2956 2957 eli = kzalloc(sizeof(*eli), GFP_KERNEL); 2958 if (!eli) 2959 return -ENOMEM; 2960 2961 INIT_LIST_HEAD(&eli->li_request_list); 2962 mutex_init(&eli->li_list_mtx); 2963 2964 eli->li_state |= EXT4_LAZYINIT_QUIT; 2965 2966 ext4_li_info = eli; 2967 2968 return 0; 2969 } 2970 2971 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 2972 ext4_group_t start) 2973 { 2974 struct ext4_sb_info *sbi = EXT4_SB(sb); 2975 struct ext4_li_request *elr; 2976 unsigned long rnd; 2977 2978 elr = kzalloc(sizeof(*elr), GFP_KERNEL); 2979 if (!elr) 2980 return NULL; 2981 2982 elr->lr_super = sb; 2983 elr->lr_sbi = sbi; 2984 elr->lr_next_group = start; 2985 2986 /* 2987 * Randomize first schedule time of the request to 2988 * spread the inode table initialization requests 2989 * better. 2990 */ 2991 get_random_bytes(&rnd, sizeof(rnd)); 2992 elr->lr_next_sched = jiffies + (unsigned long)rnd % 2993 (EXT4_DEF_LI_MAX_START_DELAY * HZ); 2994 2995 return elr; 2996 } 2997 2998 static int ext4_register_li_request(struct super_block *sb, 2999 ext4_group_t first_not_zeroed) 3000 { 3001 struct ext4_sb_info *sbi = EXT4_SB(sb); 3002 struct ext4_li_request *elr; 3003 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 3004 int ret = 0; 3005 3006 if (sbi->s_li_request != NULL) { 3007 /* 3008 * Reset timeout so it can be computed again, because 3009 * s_li_wait_mult might have changed. 3010 */ 3011 sbi->s_li_request->lr_timeout = 0; 3012 return 0; 3013 } 3014 3015 if (first_not_zeroed == ngroups || 3016 (sb->s_flags & MS_RDONLY) || 3017 !test_opt(sb, INIT_INODE_TABLE)) 3018 return 0; 3019 3020 elr = ext4_li_request_new(sb, first_not_zeroed); 3021 if (!elr) 3022 return -ENOMEM; 3023 3024 mutex_lock(&ext4_li_mtx); 3025 3026 if (NULL == ext4_li_info) { 3027 ret = ext4_li_info_new(); 3028 if (ret) 3029 goto out; 3030 } 3031 3032 mutex_lock(&ext4_li_info->li_list_mtx); 3033 list_add(&elr->lr_request, &ext4_li_info->li_request_list); 3034 mutex_unlock(&ext4_li_info->li_list_mtx); 3035 3036 sbi->s_li_request = elr; 3037 /* 3038 * set elr to NULL here since it has been inserted to 3039 * the request_list and the removal and free of it is 3040 * handled by ext4_clear_request_list from now on. 3041 */ 3042 elr = NULL; 3043 3044 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 3045 ret = ext4_run_lazyinit_thread(); 3046 if (ret) 3047 goto out; 3048 } 3049 out: 3050 mutex_unlock(&ext4_li_mtx); 3051 if (ret) 3052 kfree(elr); 3053 return ret; 3054 } 3055 3056 /* 3057 * We do not need to lock anything since this is called on 3058 * module unload. 3059 */ 3060 static void ext4_destroy_lazyinit_thread(void) 3061 { 3062 /* 3063 * If thread exited earlier 3064 * there's nothing to be done. 3065 */ 3066 if (!ext4_li_info || !ext4_lazyinit_task) 3067 return; 3068 3069 kthread_stop(ext4_lazyinit_task); 3070 } 3071 3072 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3073 __releases(kernel_lock) 3074 __acquires(kernel_lock) 3075 { 3076 char *orig_data = kstrdup(data, GFP_KERNEL); 3077 struct buffer_head *bh; 3078 struct ext4_super_block *es = NULL; 3079 struct ext4_sb_info *sbi; 3080 ext4_fsblk_t block; 3081 ext4_fsblk_t sb_block = get_sb_block(&data); 3082 ext4_fsblk_t logical_sb_block; 3083 unsigned long offset = 0; 3084 unsigned long journal_devnum = 0; 3085 unsigned long def_mount_opts; 3086 struct inode *root; 3087 char *cp; 3088 const char *descr; 3089 int ret = -ENOMEM; 3090 int blocksize; 3091 unsigned int db_count; 3092 unsigned int i; 3093 int needs_recovery, has_huge_files; 3094 __u64 blocks_count; 3095 int err; 3096 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3097 ext4_group_t first_not_zeroed; 3098 3099 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3100 if (!sbi) 3101 goto out_free_orig; 3102 3103 sbi->s_blockgroup_lock = 3104 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3105 if (!sbi->s_blockgroup_lock) { 3106 kfree(sbi); 3107 goto out_free_orig; 3108 } 3109 sb->s_fs_info = sbi; 3110 sbi->s_mount_opt = 0; 3111 sbi->s_resuid = EXT4_DEF_RESUID; 3112 sbi->s_resgid = EXT4_DEF_RESGID; 3113 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3114 sbi->s_sb_block = sb_block; 3115 if (sb->s_bdev->bd_part) 3116 sbi->s_sectors_written_start = 3117 part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3118 3119 /* Cleanup superblock name */ 3120 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 3121 *cp = '!'; 3122 3123 ret = -EINVAL; 3124 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3125 if (!blocksize) { 3126 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3127 goto out_fail; 3128 } 3129 3130 /* 3131 * The ext4 superblock will not be buffer aligned for other than 1kB 3132 * block sizes. We need to calculate the offset from buffer start. 3133 */ 3134 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 3135 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3136 offset = do_div(logical_sb_block, blocksize); 3137 } else { 3138 logical_sb_block = sb_block; 3139 } 3140 3141 if (!(bh = sb_bread(sb, logical_sb_block))) { 3142 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3143 goto out_fail; 3144 } 3145 /* 3146 * Note: s_es must be initialized as soon as possible because 3147 * some ext4 macro-instructions depend on its value 3148 */ 3149 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3150 sbi->s_es = es; 3151 sb->s_magic = le16_to_cpu(es->s_magic); 3152 if (sb->s_magic != EXT4_SUPER_MAGIC) 3153 goto cantfind_ext4; 3154 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3155 3156 /* Set defaults before we parse the mount options */ 3157 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3158 set_opt(sb, INIT_INODE_TABLE); 3159 if (def_mount_opts & EXT4_DEFM_DEBUG) 3160 set_opt(sb, DEBUG); 3161 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) { 3162 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups", 3163 "2.6.38"); 3164 set_opt(sb, GRPID); 3165 } 3166 if (def_mount_opts & EXT4_DEFM_UID16) 3167 set_opt(sb, NO_UID32); 3168 /* xattr user namespace & acls are now defaulted on */ 3169 #ifdef CONFIG_EXT4_FS_XATTR 3170 set_opt(sb, XATTR_USER); 3171 #endif 3172 #ifdef CONFIG_EXT4_FS_POSIX_ACL 3173 set_opt(sb, POSIX_ACL); 3174 #endif 3175 set_opt(sb, MBLK_IO_SUBMIT); 3176 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3177 set_opt(sb, JOURNAL_DATA); 3178 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3179 set_opt(sb, ORDERED_DATA); 3180 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3181 set_opt(sb, WRITEBACK_DATA); 3182 3183 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3184 set_opt(sb, ERRORS_PANIC); 3185 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3186 set_opt(sb, ERRORS_CONT); 3187 else 3188 set_opt(sb, ERRORS_RO); 3189 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) 3190 set_opt(sb, BLOCK_VALIDITY); 3191 if (def_mount_opts & EXT4_DEFM_DISCARD) 3192 set_opt(sb, DISCARD); 3193 3194 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 3195 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 3196 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 3197 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 3198 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3199 3200 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3201 set_opt(sb, BARRIER); 3202 3203 /* 3204 * enable delayed allocation by default 3205 * Use -o nodelalloc to turn it off 3206 */ 3207 if (!IS_EXT3_SB(sb) && 3208 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3209 set_opt(sb, DELALLOC); 3210 3211 /* 3212 * set default s_li_wait_mult for lazyinit, for the case there is 3213 * no mount option specified. 3214 */ 3215 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 3216 3217 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 3218 &journal_devnum, &journal_ioprio, NULL, 0)) { 3219 ext4_msg(sb, KERN_WARNING, 3220 "failed to parse options in superblock: %s", 3221 sbi->s_es->s_mount_opts); 3222 } 3223 if (!parse_options((char *) data, sb, &journal_devnum, 3224 &journal_ioprio, NULL, 0)) 3225 goto failed_mount; 3226 3227 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3228 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3229 3230 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3231 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 3232 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 3233 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 3234 ext4_msg(sb, KERN_WARNING, 3235 "feature flags set on rev 0 fs, " 3236 "running e2fsck is recommended"); 3237 3238 if (IS_EXT2_SB(sb)) { 3239 if (ext2_feature_set_ok(sb)) 3240 ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 3241 "using the ext4 subsystem"); 3242 else { 3243 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 3244 "to feature incompatibilities"); 3245 goto failed_mount; 3246 } 3247 } 3248 3249 if (IS_EXT3_SB(sb)) { 3250 if (ext3_feature_set_ok(sb)) 3251 ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 3252 "using the ext4 subsystem"); 3253 else { 3254 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 3255 "to feature incompatibilities"); 3256 goto failed_mount; 3257 } 3258 } 3259 3260 /* 3261 * Check feature flags regardless of the revision level, since we 3262 * previously didn't change the revision level when setting the flags, 3263 * so there is a chance incompat flags are set on a rev 0 filesystem. 3264 */ 3265 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3266 goto failed_mount; 3267 3268 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 3269 3270 if (blocksize < EXT4_MIN_BLOCK_SIZE || 3271 blocksize > EXT4_MAX_BLOCK_SIZE) { 3272 ext4_msg(sb, KERN_ERR, 3273 "Unsupported filesystem blocksize %d", blocksize); 3274 goto failed_mount; 3275 } 3276 3277 if (sb->s_blocksize != blocksize) { 3278 /* Validate the filesystem blocksize */ 3279 if (!sb_set_blocksize(sb, blocksize)) { 3280 ext4_msg(sb, KERN_ERR, "bad block size %d", 3281 blocksize); 3282 goto failed_mount; 3283 } 3284 3285 brelse(bh); 3286 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 3287 offset = do_div(logical_sb_block, blocksize); 3288 bh = sb_bread(sb, logical_sb_block); 3289 if (!bh) { 3290 ext4_msg(sb, KERN_ERR, 3291 "Can't read superblock on 2nd try"); 3292 goto failed_mount; 3293 } 3294 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 3295 sbi->s_es = es; 3296 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3297 ext4_msg(sb, KERN_ERR, 3298 "Magic mismatch, very weird!"); 3299 goto failed_mount; 3300 } 3301 } 3302 3303 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3304 EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 3305 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3306 has_huge_files); 3307 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3308 3309 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3310 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3311 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3312 } else { 3313 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3314 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3315 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 3316 (!is_power_of_2(sbi->s_inode_size)) || 3317 (sbi->s_inode_size > blocksize)) { 3318 ext4_msg(sb, KERN_ERR, 3319 "unsupported inode size: %d", 3320 sbi->s_inode_size); 3321 goto failed_mount; 3322 } 3323 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3324 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3325 } 3326 3327 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 3328 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 3329 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 3330 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3331 !is_power_of_2(sbi->s_desc_size)) { 3332 ext4_msg(sb, KERN_ERR, 3333 "unsupported descriptor size %lu", 3334 sbi->s_desc_size); 3335 goto failed_mount; 3336 } 3337 } else 3338 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 3339 3340 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3341 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3342 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 3343 goto cantfind_ext4; 3344 3345 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3346 if (sbi->s_inodes_per_block == 0) 3347 goto cantfind_ext4; 3348 sbi->s_itb_per_group = sbi->s_inodes_per_group / 3349 sbi->s_inodes_per_block; 3350 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3351 sbi->s_sbh = bh; 3352 sbi->s_mount_state = le16_to_cpu(es->s_state); 3353 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3354 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 3355 3356 for (i = 0; i < 4; i++) 3357 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3358 sbi->s_def_hash_version = es->s_def_hash_version; 3359 i = le32_to_cpu(es->s_flags); 3360 if (i & EXT2_FLAGS_UNSIGNED_HASH) 3361 sbi->s_hash_unsigned = 3; 3362 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3363 #ifdef __CHAR_UNSIGNED__ 3364 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3365 sbi->s_hash_unsigned = 3; 3366 #else 3367 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3368 #endif 3369 sb->s_dirt = 1; 3370 } 3371 3372 if (sbi->s_blocks_per_group > blocksize * 8) { 3373 ext4_msg(sb, KERN_ERR, 3374 "#blocks per group too big: %lu", 3375 sbi->s_blocks_per_group); 3376 goto failed_mount; 3377 } 3378 if (sbi->s_inodes_per_group > blocksize * 8) { 3379 ext4_msg(sb, KERN_ERR, 3380 "#inodes per group too big: %lu", 3381 sbi->s_inodes_per_group); 3382 goto failed_mount; 3383 } 3384 3385 /* 3386 * Test whether we have more sectors than will fit in sector_t, 3387 * and whether the max offset is addressable by the page cache. 3388 */ 3389 err = generic_check_addressable(sb->s_blocksize_bits, 3390 ext4_blocks_count(es)); 3391 if (err) { 3392 ext4_msg(sb, KERN_ERR, "filesystem" 3393 " too large to mount safely on this system"); 3394 if (sizeof(sector_t) < 8) 3395 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 3396 ret = err; 3397 goto failed_mount; 3398 } 3399 3400 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3401 goto cantfind_ext4; 3402 3403 /* check blocks count against device size */ 3404 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 3405 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3406 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3407 "exceeds size of device (%llu blocks)", 3408 ext4_blocks_count(es), blocks_count); 3409 goto failed_mount; 3410 } 3411 3412 /* 3413 * It makes no sense for the first data block to be beyond the end 3414 * of the filesystem. 3415 */ 3416 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3417 ext4_msg(sb, KERN_WARNING, "bad geometry: first data" 3418 "block %u is beyond end of filesystem (%llu)", 3419 le32_to_cpu(es->s_first_data_block), 3420 ext4_blocks_count(es)); 3421 goto failed_mount; 3422 } 3423 blocks_count = (ext4_blocks_count(es) - 3424 le32_to_cpu(es->s_first_data_block) + 3425 EXT4_BLOCKS_PER_GROUP(sb) - 1); 3426 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 3427 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3428 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 3429 "(block count %llu, first data block %u, " 3430 "blocks per group %lu)", sbi->s_groups_count, 3431 ext4_blocks_count(es), 3432 le32_to_cpu(es->s_first_data_block), 3433 EXT4_BLOCKS_PER_GROUP(sb)); 3434 goto failed_mount; 3435 } 3436 sbi->s_groups_count = blocks_count; 3437 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3438 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3439 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3440 EXT4_DESC_PER_BLOCK(sb); 3441 sbi->s_group_desc = ext4_kvmalloc(db_count * 3442 sizeof(struct buffer_head *), 3443 GFP_KERNEL); 3444 if (sbi->s_group_desc == NULL) { 3445 ext4_msg(sb, KERN_ERR, "not enough memory"); 3446 goto failed_mount; 3447 } 3448 3449 #ifdef CONFIG_PROC_FS 3450 if (ext4_proc_root) 3451 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 3452 #endif 3453 3454 bgl_lock_init(sbi->s_blockgroup_lock); 3455 3456 for (i = 0; i < db_count; i++) { 3457 block = descriptor_loc(sb, logical_sb_block, i); 3458 sbi->s_group_desc[i] = sb_bread(sb, block); 3459 if (!sbi->s_group_desc[i]) { 3460 ext4_msg(sb, KERN_ERR, 3461 "can't read group descriptor %d", i); 3462 db_count = i; 3463 goto failed_mount2; 3464 } 3465 } 3466 if (!ext4_check_descriptors(sb, &first_not_zeroed)) { 3467 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3468 goto failed_mount2; 3469 } 3470 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 3471 if (!ext4_fill_flex_info(sb)) { 3472 ext4_msg(sb, KERN_ERR, 3473 "unable to initialize " 3474 "flex_bg meta info!"); 3475 goto failed_mount2; 3476 } 3477 3478 sbi->s_gdb_count = db_count; 3479 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3480 spin_lock_init(&sbi->s_next_gen_lock); 3481 3482 init_timer(&sbi->s_err_report); 3483 sbi->s_err_report.function = print_daily_error_info; 3484 sbi->s_err_report.data = (unsigned long) sb; 3485 3486 err = percpu_counter_init(&sbi->s_freeblocks_counter, 3487 ext4_count_free_blocks(sb)); 3488 if (!err) { 3489 err = percpu_counter_init(&sbi->s_freeinodes_counter, 3490 ext4_count_free_inodes(sb)); 3491 } 3492 if (!err) { 3493 err = percpu_counter_init(&sbi->s_dirs_counter, 3494 ext4_count_dirs(sb)); 3495 } 3496 if (!err) { 3497 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 3498 } 3499 if (err) { 3500 ext4_msg(sb, KERN_ERR, "insufficient memory"); 3501 goto failed_mount3; 3502 } 3503 3504 sbi->s_stripe = ext4_get_stripe_size(sbi); 3505 sbi->s_max_writeback_mb_bump = 128; 3506 3507 /* 3508 * set up enough so that it can read an inode 3509 */ 3510 if (!test_opt(sb, NOLOAD) && 3511 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 3512 sb->s_op = &ext4_sops; 3513 else 3514 sb->s_op = &ext4_nojournal_sops; 3515 sb->s_export_op = &ext4_export_ops; 3516 sb->s_xattr = ext4_xattr_handlers; 3517 #ifdef CONFIG_QUOTA 3518 sb->s_qcop = &ext4_qctl_operations; 3519 sb->dq_op = &ext4_quota_operations; 3520 #endif 3521 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3522 3523 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 3524 mutex_init(&sbi->s_orphan_lock); 3525 sbi->s_resize_flags = 0; 3526 3527 sb->s_root = NULL; 3528 3529 needs_recovery = (es->s_last_orphan != 0 || 3530 EXT4_HAS_INCOMPAT_FEATURE(sb, 3531 EXT4_FEATURE_INCOMPAT_RECOVER)); 3532 3533 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) && 3534 !(sb->s_flags & MS_RDONLY)) 3535 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 3536 goto failed_mount3; 3537 3538 /* 3539 * The first inode we look at is the journal inode. Don't try 3540 * root first: it may be modified in the journal! 3541 */ 3542 if (!test_opt(sb, NOLOAD) && 3543 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3544 if (ext4_load_journal(sb, es, journal_devnum)) 3545 goto failed_mount3; 3546 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 3547 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3548 ext4_msg(sb, KERN_ERR, "required journal recovery " 3549 "suppressed and not mounted read-only"); 3550 goto failed_mount_wq; 3551 } else { 3552 clear_opt(sb, DATA_FLAGS); 3553 sbi->s_journal = NULL; 3554 needs_recovery = 0; 3555 goto no_journal; 3556 } 3557 3558 if (ext4_blocks_count(es) > 0xffffffffULL && 3559 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 3560 JBD2_FEATURE_INCOMPAT_64BIT)) { 3561 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 3562 goto failed_mount_wq; 3563 } 3564 3565 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3566 jbd2_journal_set_features(sbi->s_journal, 3567 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3568 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3569 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 3570 jbd2_journal_set_features(sbi->s_journal, 3571 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 3572 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3573 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3574 } else { 3575 jbd2_journal_clear_features(sbi->s_journal, 3576 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3577 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3578 } 3579 3580 /* We have now updated the journal if required, so we can 3581 * validate the data journaling mode. */ 3582 switch (test_opt(sb, DATA_FLAGS)) { 3583 case 0: 3584 /* No mode set, assume a default based on the journal 3585 * capabilities: ORDERED_DATA if the journal can 3586 * cope, else JOURNAL_DATA 3587 */ 3588 if (jbd2_journal_check_available_features 3589 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3590 set_opt(sb, ORDERED_DATA); 3591 else 3592 set_opt(sb, JOURNAL_DATA); 3593 break; 3594 3595 case EXT4_MOUNT_ORDERED_DATA: 3596 case EXT4_MOUNT_WRITEBACK_DATA: 3597 if (!jbd2_journal_check_available_features 3598 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3599 ext4_msg(sb, KERN_ERR, "Journal does not support " 3600 "requested data journaling mode"); 3601 goto failed_mount_wq; 3602 } 3603 default: 3604 break; 3605 } 3606 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3607 3608 /* 3609 * The journal may have updated the bg summary counts, so we 3610 * need to update the global counters. 3611 */ 3612 percpu_counter_set(&sbi->s_freeblocks_counter, 3613 ext4_count_free_blocks(sb)); 3614 percpu_counter_set(&sbi->s_freeinodes_counter, 3615 ext4_count_free_inodes(sb)); 3616 percpu_counter_set(&sbi->s_dirs_counter, 3617 ext4_count_dirs(sb)); 3618 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0); 3619 3620 no_journal: 3621 /* 3622 * The maximum number of concurrent works can be high and 3623 * concurrency isn't really necessary. Limit it to 1. 3624 */ 3625 EXT4_SB(sb)->dio_unwritten_wq = 3626 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 3627 if (!EXT4_SB(sb)->dio_unwritten_wq) { 3628 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); 3629 goto failed_mount_wq; 3630 } 3631 3632 /* 3633 * The jbd2_journal_load will have done any necessary log recovery, 3634 * so we can safely mount the rest of the filesystem now. 3635 */ 3636 3637 root = ext4_iget(sb, EXT4_ROOT_INO); 3638 if (IS_ERR(root)) { 3639 ext4_msg(sb, KERN_ERR, "get root inode failed"); 3640 ret = PTR_ERR(root); 3641 root = NULL; 3642 goto failed_mount4; 3643 } 3644 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3645 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 3646 goto failed_mount4; 3647 } 3648 sb->s_root = d_alloc_root(root); 3649 if (!sb->s_root) { 3650 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 3651 ret = -ENOMEM; 3652 goto failed_mount4; 3653 } 3654 3655 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 3656 3657 /* determine the minimum size of new large inodes, if present */ 3658 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3659 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3660 EXT4_GOOD_OLD_INODE_SIZE; 3661 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3662 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 3663 if (sbi->s_want_extra_isize < 3664 le16_to_cpu(es->s_want_extra_isize)) 3665 sbi->s_want_extra_isize = 3666 le16_to_cpu(es->s_want_extra_isize); 3667 if (sbi->s_want_extra_isize < 3668 le16_to_cpu(es->s_min_extra_isize)) 3669 sbi->s_want_extra_isize = 3670 le16_to_cpu(es->s_min_extra_isize); 3671 } 3672 } 3673 /* Check if enough inode space is available */ 3674 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3675 sbi->s_inode_size) { 3676 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3677 EXT4_GOOD_OLD_INODE_SIZE; 3678 ext4_msg(sb, KERN_INFO, "required extra inode space not" 3679 "available"); 3680 } 3681 3682 if (test_opt(sb, DELALLOC) && 3683 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) { 3684 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - " 3685 "requested data journaling mode"); 3686 clear_opt(sb, DELALLOC); 3687 } 3688 if (test_opt(sb, DIOREAD_NOLOCK)) { 3689 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 3690 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " 3691 "option - requested data journaling mode"); 3692 clear_opt(sb, DIOREAD_NOLOCK); 3693 } 3694 if (sb->s_blocksize < PAGE_SIZE) { 3695 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " 3696 "option - block size is too small"); 3697 clear_opt(sb, DIOREAD_NOLOCK); 3698 } 3699 } 3700 3701 err = ext4_setup_system_zone(sb); 3702 if (err) { 3703 ext4_msg(sb, KERN_ERR, "failed to initialize system " 3704 "zone (%d)", err); 3705 goto failed_mount4; 3706 } 3707 3708 ext4_ext_init(sb); 3709 err = ext4_mb_init(sb, needs_recovery); 3710 if (err) { 3711 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3712 err); 3713 goto failed_mount4; 3714 } 3715 3716 err = ext4_register_li_request(sb, first_not_zeroed); 3717 if (err) 3718 goto failed_mount4; 3719 3720 sbi->s_kobj.kset = ext4_kset; 3721 init_completion(&sbi->s_kobj_unregister); 3722 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 3723 "%s", sb->s_id); 3724 if (err) { 3725 ext4_mb_release(sb); 3726 ext4_ext_release(sb); 3727 goto failed_mount4; 3728 }; 3729 3730 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3731 ext4_orphan_cleanup(sb, es); 3732 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 3733 if (needs_recovery) { 3734 ext4_msg(sb, KERN_INFO, "recovery complete"); 3735 ext4_mark_recovery_complete(sb, es); 3736 } 3737 if (EXT4_SB(sb)->s_journal) { 3738 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 3739 descr = " journalled data mode"; 3740 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 3741 descr = " ordered data mode"; 3742 else 3743 descr = " writeback data mode"; 3744 } else 3745 descr = "out journal"; 3746 3747 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 3748 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 3749 *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 3750 3751 if (es->s_error_count) 3752 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 3753 3754 kfree(orig_data); 3755 return 0; 3756 3757 cantfind_ext4: 3758 if (!silent) 3759 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 3760 goto failed_mount; 3761 3762 failed_mount4: 3763 iput(root); 3764 sb->s_root = NULL; 3765 ext4_msg(sb, KERN_ERR, "mount failed"); 3766 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); 3767 failed_mount_wq: 3768 ext4_release_system_zone(sb); 3769 if (sbi->s_journal) { 3770 jbd2_journal_destroy(sbi->s_journal); 3771 sbi->s_journal = NULL; 3772 } 3773 failed_mount3: 3774 del_timer(&sbi->s_err_report); 3775 if (sbi->s_flex_groups) 3776 ext4_kvfree(sbi->s_flex_groups); 3777 percpu_counter_destroy(&sbi->s_freeblocks_counter); 3778 percpu_counter_destroy(&sbi->s_freeinodes_counter); 3779 percpu_counter_destroy(&sbi->s_dirs_counter); 3780 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 3781 if (sbi->s_mmp_tsk) 3782 kthread_stop(sbi->s_mmp_tsk); 3783 failed_mount2: 3784 for (i = 0; i < db_count; i++) 3785 brelse(sbi->s_group_desc[i]); 3786 ext4_kvfree(sbi->s_group_desc); 3787 failed_mount: 3788 if (sbi->s_proc) { 3789 remove_proc_entry(sb->s_id, ext4_proc_root); 3790 } 3791 #ifdef CONFIG_QUOTA 3792 for (i = 0; i < MAXQUOTAS; i++) 3793 kfree(sbi->s_qf_names[i]); 3794 #endif 3795 ext4_blkdev_remove(sbi); 3796 brelse(bh); 3797 out_fail: 3798 sb->s_fs_info = NULL; 3799 kfree(sbi->s_blockgroup_lock); 3800 kfree(sbi); 3801 out_free_orig: 3802 kfree(orig_data); 3803 return ret; 3804 } 3805 3806 /* 3807 * Setup any per-fs journal parameters now. We'll do this both on 3808 * initial mount, once the journal has been initialised but before we've 3809 * done any recovery; and again on any subsequent remount. 3810 */ 3811 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 3812 { 3813 struct ext4_sb_info *sbi = EXT4_SB(sb); 3814 3815 journal->j_commit_interval = sbi->s_commit_interval; 3816 journal->j_min_batch_time = sbi->s_min_batch_time; 3817 journal->j_max_batch_time = sbi->s_max_batch_time; 3818 3819 write_lock(&journal->j_state_lock); 3820 if (test_opt(sb, BARRIER)) 3821 journal->j_flags |= JBD2_BARRIER; 3822 else 3823 journal->j_flags &= ~JBD2_BARRIER; 3824 if (test_opt(sb, DATA_ERR_ABORT)) 3825 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 3826 else 3827 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 3828 write_unlock(&journal->j_state_lock); 3829 } 3830 3831 static journal_t *ext4_get_journal(struct super_block *sb, 3832 unsigned int journal_inum) 3833 { 3834 struct inode *journal_inode; 3835 journal_t *journal; 3836 3837 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3838 3839 /* First, test for the existence of a valid inode on disk. Bad 3840 * things happen if we iget() an unused inode, as the subsequent 3841 * iput() will try to delete it. */ 3842 3843 journal_inode = ext4_iget(sb, journal_inum); 3844 if (IS_ERR(journal_inode)) { 3845 ext4_msg(sb, KERN_ERR, "no journal found"); 3846 return NULL; 3847 } 3848 if (!journal_inode->i_nlink) { 3849 make_bad_inode(journal_inode); 3850 iput(journal_inode); 3851 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 3852 return NULL; 3853 } 3854 3855 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 3856 journal_inode, journal_inode->i_size); 3857 if (!S_ISREG(journal_inode->i_mode)) { 3858 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 3859 iput(journal_inode); 3860 return NULL; 3861 } 3862 3863 journal = jbd2_journal_init_inode(journal_inode); 3864 if (!journal) { 3865 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 3866 iput(journal_inode); 3867 return NULL; 3868 } 3869 journal->j_private = sb; 3870 ext4_init_journal_params(sb, journal); 3871 return journal; 3872 } 3873 3874 static journal_t *ext4_get_dev_journal(struct super_block *sb, 3875 dev_t j_dev) 3876 { 3877 struct buffer_head *bh; 3878 journal_t *journal; 3879 ext4_fsblk_t start; 3880 ext4_fsblk_t len; 3881 int hblock, blocksize; 3882 ext4_fsblk_t sb_block; 3883 unsigned long offset; 3884 struct ext4_super_block *es; 3885 struct block_device *bdev; 3886 3887 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3888 3889 bdev = ext4_blkdev_get(j_dev, sb); 3890 if (bdev == NULL) 3891 return NULL; 3892 3893 blocksize = sb->s_blocksize; 3894 hblock = bdev_logical_block_size(bdev); 3895 if (blocksize < hblock) { 3896 ext4_msg(sb, KERN_ERR, 3897 "blocksize too small for journal device"); 3898 goto out_bdev; 3899 } 3900 3901 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 3902 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 3903 set_blocksize(bdev, blocksize); 3904 if (!(bh = __bread(bdev, sb_block, blocksize))) { 3905 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 3906 "external journal"); 3907 goto out_bdev; 3908 } 3909 3910 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3911 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 3912 !(le32_to_cpu(es->s_feature_incompat) & 3913 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 3914 ext4_msg(sb, KERN_ERR, "external journal has " 3915 "bad superblock"); 3916 brelse(bh); 3917 goto out_bdev; 3918 } 3919 3920 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 3921 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 3922 brelse(bh); 3923 goto out_bdev; 3924 } 3925 3926 len = ext4_blocks_count(es); 3927 start = sb_block + 1; 3928 brelse(bh); /* we're done with the superblock */ 3929 3930 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 3931 start, len, blocksize); 3932 if (!journal) { 3933 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 3934 goto out_bdev; 3935 } 3936 journal->j_private = sb; 3937 ll_rw_block(READ, 1, &journal->j_sb_buffer); 3938 wait_on_buffer(journal->j_sb_buffer); 3939 if (!buffer_uptodate(journal->j_sb_buffer)) { 3940 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 3941 goto out_journal; 3942 } 3943 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 3944 ext4_msg(sb, KERN_ERR, "External journal has more than one " 3945 "user (unsupported) - %d", 3946 be32_to_cpu(journal->j_superblock->s_nr_users)); 3947 goto out_journal; 3948 } 3949 EXT4_SB(sb)->journal_bdev = bdev; 3950 ext4_init_journal_params(sb, journal); 3951 return journal; 3952 3953 out_journal: 3954 jbd2_journal_destroy(journal); 3955 out_bdev: 3956 ext4_blkdev_put(bdev); 3957 return NULL; 3958 } 3959 3960 static int ext4_load_journal(struct super_block *sb, 3961 struct ext4_super_block *es, 3962 unsigned long journal_devnum) 3963 { 3964 journal_t *journal; 3965 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 3966 dev_t journal_dev; 3967 int err = 0; 3968 int really_read_only; 3969 3970 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3971 3972 if (journal_devnum && 3973 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3974 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 3975 "numbers have changed"); 3976 journal_dev = new_decode_dev(journal_devnum); 3977 } else 3978 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 3979 3980 really_read_only = bdev_read_only(sb->s_bdev); 3981 3982 /* 3983 * Are we loading a blank journal or performing recovery after a 3984 * crash? For recovery, we need to check in advance whether we 3985 * can get read-write access to the device. 3986 */ 3987 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3988 if (sb->s_flags & MS_RDONLY) { 3989 ext4_msg(sb, KERN_INFO, "INFO: recovery " 3990 "required on readonly filesystem"); 3991 if (really_read_only) { 3992 ext4_msg(sb, KERN_ERR, "write access " 3993 "unavailable, cannot proceed"); 3994 return -EROFS; 3995 } 3996 ext4_msg(sb, KERN_INFO, "write access will " 3997 "be enabled during recovery"); 3998 } 3999 } 4000 4001 if (journal_inum && journal_dev) { 4002 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4003 "and inode journals!"); 4004 return -EINVAL; 4005 } 4006 4007 if (journal_inum) { 4008 if (!(journal = ext4_get_journal(sb, journal_inum))) 4009 return -EINVAL; 4010 } else { 4011 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4012 return -EINVAL; 4013 } 4014 4015 if (!(journal->j_flags & JBD2_BARRIER)) 4016 ext4_msg(sb, KERN_INFO, "barriers disabled"); 4017 4018 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 4019 err = jbd2_journal_update_format(journal); 4020 if (err) { 4021 ext4_msg(sb, KERN_ERR, "error updating journal"); 4022 jbd2_journal_destroy(journal); 4023 return err; 4024 } 4025 } 4026 4027 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 4028 err = jbd2_journal_wipe(journal, !really_read_only); 4029 if (!err) { 4030 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 4031 if (save) 4032 memcpy(save, ((char *) es) + 4033 EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4034 err = jbd2_journal_load(journal); 4035 if (save) 4036 memcpy(((char *) es) + EXT4_S_ERR_START, 4037 save, EXT4_S_ERR_LEN); 4038 kfree(save); 4039 } 4040 4041 if (err) { 4042 ext4_msg(sb, KERN_ERR, "error loading journal"); 4043 jbd2_journal_destroy(journal); 4044 return err; 4045 } 4046 4047 EXT4_SB(sb)->s_journal = journal; 4048 ext4_clear_journal_err(sb, es); 4049 4050 if (!really_read_only && journal_devnum && 4051 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4052 es->s_journal_dev = cpu_to_le32(journal_devnum); 4053 4054 /* Make sure we flush the recovery flag to disk. */ 4055 ext4_commit_super(sb, 1); 4056 } 4057 4058 return 0; 4059 } 4060 4061 static int ext4_commit_super(struct super_block *sb, int sync) 4062 { 4063 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4064 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4065 int error = 0; 4066 4067 if (!sbh) 4068 return error; 4069 if (buffer_write_io_error(sbh)) { 4070 /* 4071 * Oh, dear. A previous attempt to write the 4072 * superblock failed. This could happen because the 4073 * USB device was yanked out. Or it could happen to 4074 * be a transient write error and maybe the block will 4075 * be remapped. Nothing we can do but to retry the 4076 * write and hope for the best. 4077 */ 4078 ext4_msg(sb, KERN_ERR, "previous I/O error to " 4079 "superblock detected"); 4080 clear_buffer_write_io_error(sbh); 4081 set_buffer_uptodate(sbh); 4082 } 4083 /* 4084 * If the file system is mounted read-only, don't update the 4085 * superblock write time. This avoids updating the superblock 4086 * write time when we are mounting the root file system 4087 * read/only but we need to replay the journal; at that point, 4088 * for people who are east of GMT and who make their clock 4089 * tick in localtime for Windows bug-for-bug compatibility, 4090 * the clock is set in the future, and this will cause e2fsck 4091 * to complain and force a full file system check. 4092 */ 4093 if (!(sb->s_flags & MS_RDONLY)) 4094 es->s_wtime = cpu_to_le32(get_seconds()); 4095 if (sb->s_bdev->bd_part) 4096 es->s_kbytes_written = 4097 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4098 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4099 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4100 else 4101 es->s_kbytes_written = 4102 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 4103 ext4_free_blocks_count_set(es, percpu_counter_sum_positive( 4104 &EXT4_SB(sb)->s_freeblocks_counter)); 4105 es->s_free_inodes_count = 4106 cpu_to_le32(percpu_counter_sum_positive( 4107 &EXT4_SB(sb)->s_freeinodes_counter)); 4108 sb->s_dirt = 0; 4109 BUFFER_TRACE(sbh, "marking dirty"); 4110 mark_buffer_dirty(sbh); 4111 if (sync) { 4112 error = sync_dirty_buffer(sbh); 4113 if (error) 4114 return error; 4115 4116 error = buffer_write_io_error(sbh); 4117 if (error) { 4118 ext4_msg(sb, KERN_ERR, "I/O error while writing " 4119 "superblock"); 4120 clear_buffer_write_io_error(sbh); 4121 set_buffer_uptodate(sbh); 4122 } 4123 } 4124 return error; 4125 } 4126 4127 /* 4128 * Have we just finished recovery? If so, and if we are mounting (or 4129 * remounting) the filesystem readonly, then we will end up with a 4130 * consistent fs on disk. Record that fact. 4131 */ 4132 static void ext4_mark_recovery_complete(struct super_block *sb, 4133 struct ext4_super_block *es) 4134 { 4135 journal_t *journal = EXT4_SB(sb)->s_journal; 4136 4137 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 4138 BUG_ON(journal != NULL); 4139 return; 4140 } 4141 jbd2_journal_lock_updates(journal); 4142 if (jbd2_journal_flush(journal) < 0) 4143 goto out; 4144 4145 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 4146 sb->s_flags & MS_RDONLY) { 4147 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4148 ext4_commit_super(sb, 1); 4149 } 4150 4151 out: 4152 jbd2_journal_unlock_updates(journal); 4153 } 4154 4155 /* 4156 * If we are mounting (or read-write remounting) a filesystem whose journal 4157 * has recorded an error from a previous lifetime, move that error to the 4158 * main filesystem now. 4159 */ 4160 static void ext4_clear_journal_err(struct super_block *sb, 4161 struct ext4_super_block *es) 4162 { 4163 journal_t *journal; 4164 int j_errno; 4165 const char *errstr; 4166 4167 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 4168 4169 journal = EXT4_SB(sb)->s_journal; 4170 4171 /* 4172 * Now check for any error status which may have been recorded in the 4173 * journal by a prior ext4_error() or ext4_abort() 4174 */ 4175 4176 j_errno = jbd2_journal_errno(journal); 4177 if (j_errno) { 4178 char nbuf[16]; 4179 4180 errstr = ext4_decode_error(sb, j_errno, nbuf); 4181 ext4_warning(sb, "Filesystem error recorded " 4182 "from previous mount: %s", errstr); 4183 ext4_warning(sb, "Marking fs in need of filesystem check."); 4184 4185 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4186 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4187 ext4_commit_super(sb, 1); 4188 4189 jbd2_journal_clear_err(journal); 4190 } 4191 } 4192 4193 /* 4194 * Force the running and committing transactions to commit, 4195 * and wait on the commit. 4196 */ 4197 int ext4_force_commit(struct super_block *sb) 4198 { 4199 journal_t *journal; 4200 int ret = 0; 4201 4202 if (sb->s_flags & MS_RDONLY) 4203 return 0; 4204 4205 journal = EXT4_SB(sb)->s_journal; 4206 if (journal) { 4207 vfs_check_frozen(sb, SB_FREEZE_TRANS); 4208 ret = ext4_journal_force_commit(journal); 4209 } 4210 4211 return ret; 4212 } 4213 4214 static void ext4_write_super(struct super_block *sb) 4215 { 4216 lock_super(sb); 4217 ext4_commit_super(sb, 1); 4218 unlock_super(sb); 4219 } 4220 4221 static int ext4_sync_fs(struct super_block *sb, int wait) 4222 { 4223 int ret = 0; 4224 tid_t target; 4225 struct ext4_sb_info *sbi = EXT4_SB(sb); 4226 4227 trace_ext4_sync_fs(sb, wait); 4228 flush_workqueue(sbi->dio_unwritten_wq); 4229 if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4230 if (wait) 4231 jbd2_log_wait_commit(sbi->s_journal, target); 4232 } 4233 return ret; 4234 } 4235 4236 /* 4237 * LVM calls this function before a (read-only) snapshot is created. This 4238 * gives us a chance to flush the journal completely and mark the fs clean. 4239 * 4240 * Note that only this function cannot bring a filesystem to be in a clean 4241 * state independently, because ext4 prevents a new handle from being started 4242 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from 4243 * the upper layer. 4244 */ 4245 static int ext4_freeze(struct super_block *sb) 4246 { 4247 int error = 0; 4248 journal_t *journal; 4249 4250 if (sb->s_flags & MS_RDONLY) 4251 return 0; 4252 4253 journal = EXT4_SB(sb)->s_journal; 4254 4255 /* Now we set up the journal barrier. */ 4256 jbd2_journal_lock_updates(journal); 4257 4258 /* 4259 * Don't clear the needs_recovery flag if we failed to flush 4260 * the journal. 4261 */ 4262 error = jbd2_journal_flush(journal); 4263 if (error < 0) 4264 goto out; 4265 4266 /* Journal blocked and flushed, clear needs_recovery flag. */ 4267 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4268 error = ext4_commit_super(sb, 1); 4269 out: 4270 /* we rely on s_frozen to stop further updates */ 4271 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4272 return error; 4273 } 4274 4275 /* 4276 * Called by LVM after the snapshot is done. We need to reset the RECOVER 4277 * flag here, even though the filesystem is not technically dirty yet. 4278 */ 4279 static int ext4_unfreeze(struct super_block *sb) 4280 { 4281 if (sb->s_flags & MS_RDONLY) 4282 return 0; 4283 4284 lock_super(sb); 4285 /* Reset the needs_recovery flag before the fs is unlocked. */ 4286 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4287 ext4_commit_super(sb, 1); 4288 unlock_super(sb); 4289 return 0; 4290 } 4291 4292 /* 4293 * Structure to save mount options for ext4_remount's benefit 4294 */ 4295 struct ext4_mount_options { 4296 unsigned long s_mount_opt; 4297 unsigned long s_mount_opt2; 4298 uid_t s_resuid; 4299 gid_t s_resgid; 4300 unsigned long s_commit_interval; 4301 u32 s_min_batch_time, s_max_batch_time; 4302 #ifdef CONFIG_QUOTA 4303 int s_jquota_fmt; 4304 char *s_qf_names[MAXQUOTAS]; 4305 #endif 4306 }; 4307 4308 static int ext4_remount(struct super_block *sb, int *flags, char *data) 4309 { 4310 struct ext4_super_block *es; 4311 struct ext4_sb_info *sbi = EXT4_SB(sb); 4312 ext4_fsblk_t n_blocks_count = 0; 4313 unsigned long old_sb_flags; 4314 struct ext4_mount_options old_opts; 4315 int enable_quota = 0; 4316 ext4_group_t g; 4317 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4318 int err = 0; 4319 #ifdef CONFIG_QUOTA 4320 int i; 4321 #endif 4322 char *orig_data = kstrdup(data, GFP_KERNEL); 4323 4324 /* Store the original options */ 4325 lock_super(sb); 4326 old_sb_flags = sb->s_flags; 4327 old_opts.s_mount_opt = sbi->s_mount_opt; 4328 old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4329 old_opts.s_resuid = sbi->s_resuid; 4330 old_opts.s_resgid = sbi->s_resgid; 4331 old_opts.s_commit_interval = sbi->s_commit_interval; 4332 old_opts.s_min_batch_time = sbi->s_min_batch_time; 4333 old_opts.s_max_batch_time = sbi->s_max_batch_time; 4334 #ifdef CONFIG_QUOTA 4335 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4336 for (i = 0; i < MAXQUOTAS; i++) 4337 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 4338 #endif 4339 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4340 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4341 4342 /* 4343 * Allow the "check" option to be passed as a remount option. 4344 */ 4345 if (!parse_options(data, sb, NULL, &journal_ioprio, 4346 &n_blocks_count, 1)) { 4347 err = -EINVAL; 4348 goto restore_opts; 4349 } 4350 4351 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 4352 ext4_abort(sb, "Abort forced by user"); 4353 4354 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 4355 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 4356 4357 es = sbi->s_es; 4358 4359 if (sbi->s_journal) { 4360 ext4_init_journal_params(sb, sbi->s_journal); 4361 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4362 } 4363 4364 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 4365 n_blocks_count > ext4_blocks_count(es)) { 4366 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 4367 err = -EROFS; 4368 goto restore_opts; 4369 } 4370 4371 if (*flags & MS_RDONLY) { 4372 err = dquot_suspend(sb, -1); 4373 if (err < 0) 4374 goto restore_opts; 4375 4376 /* 4377 * First of all, the unconditional stuff we have to do 4378 * to disable replay of the journal when we next remount 4379 */ 4380 sb->s_flags |= MS_RDONLY; 4381 4382 /* 4383 * OK, test if we are remounting a valid rw partition 4384 * readonly, and if so set the rdonly flag and then 4385 * mark the partition as valid again. 4386 */ 4387 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 4388 (sbi->s_mount_state & EXT4_VALID_FS)) 4389 es->s_state = cpu_to_le16(sbi->s_mount_state); 4390 4391 if (sbi->s_journal) 4392 ext4_mark_recovery_complete(sb, es); 4393 } else { 4394 /* Make sure we can mount this feature set readwrite */ 4395 if (!ext4_feature_set_ok(sb, 0)) { 4396 err = -EROFS; 4397 goto restore_opts; 4398 } 4399 /* 4400 * Make sure the group descriptor checksums 4401 * are sane. If they aren't, refuse to remount r/w. 4402 */ 4403 for (g = 0; g < sbi->s_groups_count; g++) { 4404 struct ext4_group_desc *gdp = 4405 ext4_get_group_desc(sb, g, NULL); 4406 4407 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 4408 ext4_msg(sb, KERN_ERR, 4409 "ext4_remount: Checksum for group %u failed (%u!=%u)", 4410 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 4411 le16_to_cpu(gdp->bg_checksum)); 4412 err = -EINVAL; 4413 goto restore_opts; 4414 } 4415 } 4416 4417 /* 4418 * If we have an unprocessed orphan list hanging 4419 * around from a previously readonly bdev mount, 4420 * require a full umount/remount for now. 4421 */ 4422 if (es->s_last_orphan) { 4423 ext4_msg(sb, KERN_WARNING, "Couldn't " 4424 "remount RDWR because of unprocessed " 4425 "orphan inode list. Please " 4426 "umount/remount instead"); 4427 err = -EINVAL; 4428 goto restore_opts; 4429 } 4430 4431 /* 4432 * Mounting a RDONLY partition read-write, so reread 4433 * and store the current valid flag. (It may have 4434 * been changed by e2fsck since we originally mounted 4435 * the partition.) 4436 */ 4437 if (sbi->s_journal) 4438 ext4_clear_journal_err(sb, es); 4439 sbi->s_mount_state = le16_to_cpu(es->s_state); 4440 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 4441 goto restore_opts; 4442 if (!ext4_setup_super(sb, es, 0)) 4443 sb->s_flags &= ~MS_RDONLY; 4444 if (EXT4_HAS_INCOMPAT_FEATURE(sb, 4445 EXT4_FEATURE_INCOMPAT_MMP)) 4446 if (ext4_multi_mount_protect(sb, 4447 le64_to_cpu(es->s_mmp_block))) { 4448 err = -EROFS; 4449 goto restore_opts; 4450 } 4451 enable_quota = 1; 4452 } 4453 } 4454 4455 /* 4456 * Reinitialize lazy itable initialization thread based on 4457 * current settings 4458 */ 4459 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 4460 ext4_unregister_li_request(sb); 4461 else { 4462 ext4_group_t first_not_zeroed; 4463 first_not_zeroed = ext4_has_uninit_itable(sb); 4464 ext4_register_li_request(sb, first_not_zeroed); 4465 } 4466 4467 ext4_setup_system_zone(sb); 4468 if (sbi->s_journal == NULL) 4469 ext4_commit_super(sb, 1); 4470 4471 #ifdef CONFIG_QUOTA 4472 /* Release old quota file names */ 4473 for (i = 0; i < MAXQUOTAS; i++) 4474 if (old_opts.s_qf_names[i] && 4475 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 4476 kfree(old_opts.s_qf_names[i]); 4477 #endif 4478 unlock_super(sb); 4479 if (enable_quota) 4480 dquot_resume(sb, -1); 4481 4482 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 4483 kfree(orig_data); 4484 return 0; 4485 4486 restore_opts: 4487 sb->s_flags = old_sb_flags; 4488 sbi->s_mount_opt = old_opts.s_mount_opt; 4489 sbi->s_mount_opt2 = old_opts.s_mount_opt2; 4490 sbi->s_resuid = old_opts.s_resuid; 4491 sbi->s_resgid = old_opts.s_resgid; 4492 sbi->s_commit_interval = old_opts.s_commit_interval; 4493 sbi->s_min_batch_time = old_opts.s_min_batch_time; 4494 sbi->s_max_batch_time = old_opts.s_max_batch_time; 4495 #ifdef CONFIG_QUOTA 4496 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 4497 for (i = 0; i < MAXQUOTAS; i++) { 4498 if (sbi->s_qf_names[i] && 4499 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 4500 kfree(sbi->s_qf_names[i]); 4501 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 4502 } 4503 #endif 4504 unlock_super(sb); 4505 kfree(orig_data); 4506 return err; 4507 } 4508 4509 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 4510 { 4511 struct super_block *sb = dentry->d_sb; 4512 struct ext4_sb_info *sbi = EXT4_SB(sb); 4513 struct ext4_super_block *es = sbi->s_es; 4514 u64 fsid; 4515 s64 bfree; 4516 4517 if (test_opt(sb, MINIX_DF)) { 4518 sbi->s_overhead_last = 0; 4519 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 4520 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 4521 ext4_fsblk_t overhead = 0; 4522 4523 /* 4524 * Compute the overhead (FS structures). This is constant 4525 * for a given filesystem unless the number of block groups 4526 * changes so we cache the previous value until it does. 4527 */ 4528 4529 /* 4530 * All of the blocks before first_data_block are 4531 * overhead 4532 */ 4533 overhead = le32_to_cpu(es->s_first_data_block); 4534 4535 /* 4536 * Add the overhead attributed to the superblock and 4537 * block group descriptors. If the sparse superblocks 4538 * feature is turned on, then not all groups have this. 4539 */ 4540 for (i = 0; i < ngroups; i++) { 4541 overhead += ext4_bg_has_super(sb, i) + 4542 ext4_bg_num_gdb(sb, i); 4543 cond_resched(); 4544 } 4545 4546 /* 4547 * Every block group has an inode bitmap, a block 4548 * bitmap, and an inode table. 4549 */ 4550 overhead += ngroups * (2 + sbi->s_itb_per_group); 4551 sbi->s_overhead_last = overhead; 4552 smp_wmb(); 4553 sbi->s_blocks_last = ext4_blocks_count(es); 4554 } 4555 4556 buf->f_type = EXT4_SUPER_MAGIC; 4557 buf->f_bsize = sb->s_blocksize; 4558 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 4559 bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 4560 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 4561 /* prevent underflow in case that few free space is available */ 4562 buf->f_bfree = max_t(s64, bfree, 0); 4563 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 4564 if (buf->f_bfree < ext4_r_blocks_count(es)) 4565 buf->f_bavail = 0; 4566 buf->f_files = le32_to_cpu(es->s_inodes_count); 4567 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 4568 buf->f_namelen = EXT4_NAME_LEN; 4569 fsid = le64_to_cpup((void *)es->s_uuid) ^ 4570 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 4571 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 4572 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 4573 4574 return 0; 4575 } 4576 4577 /* Helper function for writing quotas on sync - we need to start transaction 4578 * before quota file is locked for write. Otherwise the are possible deadlocks: 4579 * Process 1 Process 2 4580 * ext4_create() quota_sync() 4581 * jbd2_journal_start() write_dquot() 4582 * dquot_initialize() down(dqio_mutex) 4583 * down(dqio_mutex) jbd2_journal_start() 4584 * 4585 */ 4586 4587 #ifdef CONFIG_QUOTA 4588 4589 static inline struct inode *dquot_to_inode(struct dquot *dquot) 4590 { 4591 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 4592 } 4593 4594 static int ext4_write_dquot(struct dquot *dquot) 4595 { 4596 int ret, err; 4597 handle_t *handle; 4598 struct inode *inode; 4599 4600 inode = dquot_to_inode(dquot); 4601 handle = ext4_journal_start(inode, 4602 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 4603 if (IS_ERR(handle)) 4604 return PTR_ERR(handle); 4605 ret = dquot_commit(dquot); 4606 err = ext4_journal_stop(handle); 4607 if (!ret) 4608 ret = err; 4609 return ret; 4610 } 4611 4612 static int ext4_acquire_dquot(struct dquot *dquot) 4613 { 4614 int ret, err; 4615 handle_t *handle; 4616 4617 handle = ext4_journal_start(dquot_to_inode(dquot), 4618 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 4619 if (IS_ERR(handle)) 4620 return PTR_ERR(handle); 4621 ret = dquot_acquire(dquot); 4622 err = ext4_journal_stop(handle); 4623 if (!ret) 4624 ret = err; 4625 return ret; 4626 } 4627 4628 static int ext4_release_dquot(struct dquot *dquot) 4629 { 4630 int ret, err; 4631 handle_t *handle; 4632 4633 handle = ext4_journal_start(dquot_to_inode(dquot), 4634 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 4635 if (IS_ERR(handle)) { 4636 /* Release dquot anyway to avoid endless cycle in dqput() */ 4637 dquot_release(dquot); 4638 return PTR_ERR(handle); 4639 } 4640 ret = dquot_release(dquot); 4641 err = ext4_journal_stop(handle); 4642 if (!ret) 4643 ret = err; 4644 return ret; 4645 } 4646 4647 static int ext4_mark_dquot_dirty(struct dquot *dquot) 4648 { 4649 /* Are we journaling quotas? */ 4650 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 4651 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 4652 dquot_mark_dquot_dirty(dquot); 4653 return ext4_write_dquot(dquot); 4654 } else { 4655 return dquot_mark_dquot_dirty(dquot); 4656 } 4657 } 4658 4659 static int ext4_write_info(struct super_block *sb, int type) 4660 { 4661 int ret, err; 4662 handle_t *handle; 4663 4664 /* Data block + inode block */ 4665 handle = ext4_journal_start(sb->s_root->d_inode, 2); 4666 if (IS_ERR(handle)) 4667 return PTR_ERR(handle); 4668 ret = dquot_commit_info(sb, type); 4669 err = ext4_journal_stop(handle); 4670 if (!ret) 4671 ret = err; 4672 return ret; 4673 } 4674 4675 /* 4676 * Turn on quotas during mount time - we need to find 4677 * the quota file and such... 4678 */ 4679 static int ext4_quota_on_mount(struct super_block *sb, int type) 4680 { 4681 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 4682 EXT4_SB(sb)->s_jquota_fmt, type); 4683 } 4684 4685 /* 4686 * Standard function to be called on quota_on 4687 */ 4688 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 4689 struct path *path) 4690 { 4691 int err; 4692 4693 if (!test_opt(sb, QUOTA)) 4694 return -EINVAL; 4695 4696 /* Quotafile not on the same filesystem? */ 4697 if (path->mnt->mnt_sb != sb) 4698 return -EXDEV; 4699 /* Journaling quota? */ 4700 if (EXT4_SB(sb)->s_qf_names[type]) { 4701 /* Quotafile not in fs root? */ 4702 if (path->dentry->d_parent != sb->s_root) 4703 ext4_msg(sb, KERN_WARNING, 4704 "Quota file not on filesystem root. " 4705 "Journaled quota will not work"); 4706 } 4707 4708 /* 4709 * When we journal data on quota file, we have to flush journal to see 4710 * all updates to the file when we bypass pagecache... 4711 */ 4712 if (EXT4_SB(sb)->s_journal && 4713 ext4_should_journal_data(path->dentry->d_inode)) { 4714 /* 4715 * We don't need to lock updates but journal_flush() could 4716 * otherwise be livelocked... 4717 */ 4718 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 4719 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 4720 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4721 if (err) 4722 return err; 4723 } 4724 4725 return dquot_quota_on(sb, type, format_id, path); 4726 } 4727 4728 static int ext4_quota_off(struct super_block *sb, int type) 4729 { 4730 struct inode *inode = sb_dqopt(sb)->files[type]; 4731 handle_t *handle; 4732 4733 /* Force all delayed allocation blocks to be allocated. 4734 * Caller already holds s_umount sem */ 4735 if (test_opt(sb, DELALLOC)) 4736 sync_filesystem(sb); 4737 4738 if (!inode) 4739 goto out; 4740 4741 /* Update modification times of quota files when userspace can 4742 * start looking at them */ 4743 handle = ext4_journal_start(inode, 1); 4744 if (IS_ERR(handle)) 4745 goto out; 4746 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 4747 ext4_mark_inode_dirty(handle, inode); 4748 ext4_journal_stop(handle); 4749 4750 out: 4751 return dquot_quota_off(sb, type); 4752 } 4753 4754 /* Read data from quotafile - avoid pagecache and such because we cannot afford 4755 * acquiring the locks... As quota files are never truncated and quota code 4756 * itself serializes the operations (and no one else should touch the files) 4757 * we don't have to be afraid of races */ 4758 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 4759 size_t len, loff_t off) 4760 { 4761 struct inode *inode = sb_dqopt(sb)->files[type]; 4762 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4763 int err = 0; 4764 int offset = off & (sb->s_blocksize - 1); 4765 int tocopy; 4766 size_t toread; 4767 struct buffer_head *bh; 4768 loff_t i_size = i_size_read(inode); 4769 4770 if (off > i_size) 4771 return 0; 4772 if (off+len > i_size) 4773 len = i_size-off; 4774 toread = len; 4775 while (toread > 0) { 4776 tocopy = sb->s_blocksize - offset < toread ? 4777 sb->s_blocksize - offset : toread; 4778 bh = ext4_bread(NULL, inode, blk, 0, &err); 4779 if (err) 4780 return err; 4781 if (!bh) /* A hole? */ 4782 memset(data, 0, tocopy); 4783 else 4784 memcpy(data, bh->b_data+offset, tocopy); 4785 brelse(bh); 4786 offset = 0; 4787 toread -= tocopy; 4788 data += tocopy; 4789 blk++; 4790 } 4791 return len; 4792 } 4793 4794 /* Write to quotafile (we know the transaction is already started and has 4795 * enough credits) */ 4796 static ssize_t ext4_quota_write(struct super_block *sb, int type, 4797 const char *data, size_t len, loff_t off) 4798 { 4799 struct inode *inode = sb_dqopt(sb)->files[type]; 4800 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4801 int err = 0; 4802 int offset = off & (sb->s_blocksize - 1); 4803 struct buffer_head *bh; 4804 handle_t *handle = journal_current_handle(); 4805 4806 if (EXT4_SB(sb)->s_journal && !handle) { 4807 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4808 " cancelled because transaction is not started", 4809 (unsigned long long)off, (unsigned long long)len); 4810 return -EIO; 4811 } 4812 /* 4813 * Since we account only one data block in transaction credits, 4814 * then it is impossible to cross a block boundary. 4815 */ 4816 if (sb->s_blocksize - offset < len) { 4817 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4818 " cancelled because not block aligned", 4819 (unsigned long long)off, (unsigned long long)len); 4820 return -EIO; 4821 } 4822 4823 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 4824 bh = ext4_bread(handle, inode, blk, 1, &err); 4825 if (!bh) 4826 goto out; 4827 err = ext4_journal_get_write_access(handle, bh); 4828 if (err) { 4829 brelse(bh); 4830 goto out; 4831 } 4832 lock_buffer(bh); 4833 memcpy(bh->b_data+offset, data, len); 4834 flush_dcache_page(bh->b_page); 4835 unlock_buffer(bh); 4836 err = ext4_handle_dirty_metadata(handle, NULL, bh); 4837 brelse(bh); 4838 out: 4839 if (err) { 4840 mutex_unlock(&inode->i_mutex); 4841 return err; 4842 } 4843 if (inode->i_size < off + len) { 4844 i_size_write(inode, off + len); 4845 EXT4_I(inode)->i_disksize = inode->i_size; 4846 ext4_mark_inode_dirty(handle, inode); 4847 } 4848 mutex_unlock(&inode->i_mutex); 4849 return len; 4850 } 4851 4852 #endif 4853 4854 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 4855 const char *dev_name, void *data) 4856 { 4857 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 4858 } 4859 4860 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 4861 static inline void register_as_ext2(void) 4862 { 4863 int err = register_filesystem(&ext2_fs_type); 4864 if (err) 4865 printk(KERN_WARNING 4866 "EXT4-fs: Unable to register as ext2 (%d)\n", err); 4867 } 4868 4869 static inline void unregister_as_ext2(void) 4870 { 4871 unregister_filesystem(&ext2_fs_type); 4872 } 4873 4874 static inline int ext2_feature_set_ok(struct super_block *sb) 4875 { 4876 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP)) 4877 return 0; 4878 if (sb->s_flags & MS_RDONLY) 4879 return 1; 4880 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP)) 4881 return 0; 4882 return 1; 4883 } 4884 MODULE_ALIAS("ext2"); 4885 #else 4886 static inline void register_as_ext2(void) { } 4887 static inline void unregister_as_ext2(void) { } 4888 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 4889 #endif 4890 4891 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 4892 static inline void register_as_ext3(void) 4893 { 4894 int err = register_filesystem(&ext3_fs_type); 4895 if (err) 4896 printk(KERN_WARNING 4897 "EXT4-fs: Unable to register as ext3 (%d)\n", err); 4898 } 4899 4900 static inline void unregister_as_ext3(void) 4901 { 4902 unregister_filesystem(&ext3_fs_type); 4903 } 4904 4905 static inline int ext3_feature_set_ok(struct super_block *sb) 4906 { 4907 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP)) 4908 return 0; 4909 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 4910 return 0; 4911 if (sb->s_flags & MS_RDONLY) 4912 return 1; 4913 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) 4914 return 0; 4915 return 1; 4916 } 4917 MODULE_ALIAS("ext3"); 4918 #else 4919 static inline void register_as_ext3(void) { } 4920 static inline void unregister_as_ext3(void) { } 4921 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; } 4922 #endif 4923 4924 static struct file_system_type ext4_fs_type = { 4925 .owner = THIS_MODULE, 4926 .name = "ext4", 4927 .mount = ext4_mount, 4928 .kill_sb = kill_block_super, 4929 .fs_flags = FS_REQUIRES_DEV, 4930 }; 4931 4932 static int __init ext4_init_feat_adverts(void) 4933 { 4934 struct ext4_features *ef; 4935 int ret = -ENOMEM; 4936 4937 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); 4938 if (!ef) 4939 goto out; 4940 4941 ef->f_kobj.kset = ext4_kset; 4942 init_completion(&ef->f_kobj_unregister); 4943 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, 4944 "features"); 4945 if (ret) { 4946 kfree(ef); 4947 goto out; 4948 } 4949 4950 ext4_feat = ef; 4951 ret = 0; 4952 out: 4953 return ret; 4954 } 4955 4956 static void ext4_exit_feat_adverts(void) 4957 { 4958 kobject_put(&ext4_feat->f_kobj); 4959 wait_for_completion(&ext4_feat->f_kobj_unregister); 4960 kfree(ext4_feat); 4961 } 4962 4963 /* Shared across all ext4 file systems */ 4964 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 4965 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 4966 4967 static int __init ext4_init_fs(void) 4968 { 4969 int i, err; 4970 4971 ext4_check_flag_values(); 4972 4973 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) { 4974 mutex_init(&ext4__aio_mutex[i]); 4975 init_waitqueue_head(&ext4__ioend_wq[i]); 4976 } 4977 4978 err = ext4_init_pageio(); 4979 if (err) 4980 return err; 4981 err = ext4_init_system_zone(); 4982 if (err) 4983 goto out7; 4984 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 4985 if (!ext4_kset) 4986 goto out6; 4987 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 4988 if (!ext4_proc_root) 4989 goto out5; 4990 4991 err = ext4_init_feat_adverts(); 4992 if (err) 4993 goto out4; 4994 4995 err = ext4_init_mballoc(); 4996 if (err) 4997 goto out3; 4998 4999 err = ext4_init_xattr(); 5000 if (err) 5001 goto out2; 5002 err = init_inodecache(); 5003 if (err) 5004 goto out1; 5005 register_as_ext3(); 5006 register_as_ext2(); 5007 err = register_filesystem(&ext4_fs_type); 5008 if (err) 5009 goto out; 5010 5011 ext4_li_info = NULL; 5012 mutex_init(&ext4_li_mtx); 5013 return 0; 5014 out: 5015 unregister_as_ext2(); 5016 unregister_as_ext3(); 5017 destroy_inodecache(); 5018 out1: 5019 ext4_exit_xattr(); 5020 out2: 5021 ext4_exit_mballoc(); 5022 out3: 5023 ext4_exit_feat_adverts(); 5024 out4: 5025 remove_proc_entry("fs/ext4", NULL); 5026 out5: 5027 kset_unregister(ext4_kset); 5028 out6: 5029 ext4_exit_system_zone(); 5030 out7: 5031 ext4_exit_pageio(); 5032 return err; 5033 } 5034 5035 static void __exit ext4_exit_fs(void) 5036 { 5037 ext4_destroy_lazyinit_thread(); 5038 unregister_as_ext2(); 5039 unregister_as_ext3(); 5040 unregister_filesystem(&ext4_fs_type); 5041 destroy_inodecache(); 5042 ext4_exit_xattr(); 5043 ext4_exit_mballoc(); 5044 ext4_exit_feat_adverts(); 5045 remove_proc_entry("fs/ext4", NULL); 5046 kset_unregister(ext4_kset); 5047 ext4_exit_system_zone(); 5048 ext4_exit_pageio(); 5049 } 5050 5051 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 5052 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5053 MODULE_LICENSE("GPL"); 5054 module_init(ext4_init_fs) 5055 module_exit(ext4_exit_fs) 5056