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[mirror_ubuntu-hirsute-kernel.git] / fs / affs / super.c
1 /*
2 * linux/fs/affs/inode.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/statfs.h>
16 #include <linux/parser.h>
17 #include <linux/magic.h>
18 #include <linux/sched.h>
19 #include <linux/cred.h>
20 #include <linux/slab.h>
21 #include <linux/writeback.h>
22 #include <linux/blkdev.h>
23 #include <linux/seq_file.h>
24 #include <linux/iversion.h>
25 #include "affs.h"
26
27 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
28 static int affs_show_options(struct seq_file *m, struct dentry *root);
29 static int affs_remount (struct super_block *sb, int *flags, char *data);
30
31 static void
32 affs_commit_super(struct super_block *sb, int wait)
33 {
34 struct affs_sb_info *sbi = AFFS_SB(sb);
35 struct buffer_head *bh = sbi->s_root_bh;
36 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
37
38 lock_buffer(bh);
39 affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
40 affs_fix_checksum(sb, bh);
41 unlock_buffer(bh);
42
43 mark_buffer_dirty(bh);
44 if (wait)
45 sync_dirty_buffer(bh);
46 }
47
48 static void
49 affs_put_super(struct super_block *sb)
50 {
51 struct affs_sb_info *sbi = AFFS_SB(sb);
52 pr_debug("%s()\n", __func__);
53
54 cancel_delayed_work_sync(&sbi->sb_work);
55 }
56
57 static int
58 affs_sync_fs(struct super_block *sb, int wait)
59 {
60 affs_commit_super(sb, wait);
61 return 0;
62 }
63
64 static void flush_superblock(struct work_struct *work)
65 {
66 struct affs_sb_info *sbi;
67 struct super_block *sb;
68
69 sbi = container_of(work, struct affs_sb_info, sb_work.work);
70 sb = sbi->sb;
71
72 spin_lock(&sbi->work_lock);
73 sbi->work_queued = 0;
74 spin_unlock(&sbi->work_lock);
75
76 affs_commit_super(sb, 1);
77 }
78
79 void affs_mark_sb_dirty(struct super_block *sb)
80 {
81 struct affs_sb_info *sbi = AFFS_SB(sb);
82 unsigned long delay;
83
84 if (sb_rdonly(sb))
85 return;
86
87 spin_lock(&sbi->work_lock);
88 if (!sbi->work_queued) {
89 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
90 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
91 sbi->work_queued = 1;
92 }
93 spin_unlock(&sbi->work_lock);
94 }
95
96 static struct kmem_cache * affs_inode_cachep;
97
98 static struct inode *affs_alloc_inode(struct super_block *sb)
99 {
100 struct affs_inode_info *i;
101
102 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
103 if (!i)
104 return NULL;
105
106 inode_set_iversion(&i->vfs_inode, 1);
107 i->i_lc = NULL;
108 i->i_ext_bh = NULL;
109 i->i_pa_cnt = 0;
110
111 return &i->vfs_inode;
112 }
113
114 static void affs_i_callback(struct rcu_head *head)
115 {
116 struct inode *inode = container_of(head, struct inode, i_rcu);
117 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
118 }
119
120 static void affs_destroy_inode(struct inode *inode)
121 {
122 call_rcu(&inode->i_rcu, affs_i_callback);
123 }
124
125 static void init_once(void *foo)
126 {
127 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
128
129 sema_init(&ei->i_link_lock, 1);
130 sema_init(&ei->i_ext_lock, 1);
131 inode_init_once(&ei->vfs_inode);
132 }
133
134 static int __init init_inodecache(void)
135 {
136 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
137 sizeof(struct affs_inode_info),
138 0, (SLAB_RECLAIM_ACCOUNT|
139 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
140 init_once);
141 if (affs_inode_cachep == NULL)
142 return -ENOMEM;
143 return 0;
144 }
145
146 static void destroy_inodecache(void)
147 {
148 /*
149 * Make sure all delayed rcu free inodes are flushed before we
150 * destroy cache.
151 */
152 rcu_barrier();
153 kmem_cache_destroy(affs_inode_cachep);
154 }
155
156 static const struct super_operations affs_sops = {
157 .alloc_inode = affs_alloc_inode,
158 .destroy_inode = affs_destroy_inode,
159 .write_inode = affs_write_inode,
160 .evict_inode = affs_evict_inode,
161 .put_super = affs_put_super,
162 .sync_fs = affs_sync_fs,
163 .statfs = affs_statfs,
164 .remount_fs = affs_remount,
165 .show_options = affs_show_options,
166 };
167
168 enum {
169 Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
170 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
171 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
172 };
173
174 static const match_table_t tokens = {
175 {Opt_bs, "bs=%u"},
176 {Opt_mode, "mode=%o"},
177 {Opt_mufs, "mufs"},
178 {Opt_notruncate, "nofilenametruncate"},
179 {Opt_prefix, "prefix=%s"},
180 {Opt_protect, "protect"},
181 {Opt_reserved, "reserved=%u"},
182 {Opt_root, "root=%u"},
183 {Opt_setgid, "setgid=%u"},
184 {Opt_setuid, "setuid=%u"},
185 {Opt_verbose, "verbose"},
186 {Opt_volume, "volume=%s"},
187 {Opt_ignore, "grpquota"},
188 {Opt_ignore, "noquota"},
189 {Opt_ignore, "quota"},
190 {Opt_ignore, "usrquota"},
191 {Opt_err, NULL},
192 };
193
194 static int
195 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
196 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
197 {
198 char *p;
199 substring_t args[MAX_OPT_ARGS];
200
201 /* Fill in defaults */
202
203 *uid = current_uid();
204 *gid = current_gid();
205 *reserved = 2;
206 *root = -1;
207 *blocksize = -1;
208 volume[0] = ':';
209 volume[1] = 0;
210 *mount_opts = 0;
211 if (!options)
212 return 1;
213
214 while ((p = strsep(&options, ",")) != NULL) {
215 int token, n, option;
216 if (!*p)
217 continue;
218
219 token = match_token(p, tokens, args);
220 switch (token) {
221 case Opt_bs:
222 if (match_int(&args[0], &n))
223 return 0;
224 if (n != 512 && n != 1024 && n != 2048
225 && n != 4096) {
226 pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
227 return 0;
228 }
229 *blocksize = n;
230 break;
231 case Opt_mode:
232 if (match_octal(&args[0], &option))
233 return 0;
234 *mode = option & 0777;
235 affs_set_opt(*mount_opts, SF_SETMODE);
236 break;
237 case Opt_mufs:
238 affs_set_opt(*mount_opts, SF_MUFS);
239 break;
240 case Opt_notruncate:
241 affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
242 break;
243 case Opt_prefix:
244 kfree(*prefix);
245 *prefix = match_strdup(&args[0]);
246 if (!*prefix)
247 return 0;
248 affs_set_opt(*mount_opts, SF_PREFIX);
249 break;
250 case Opt_protect:
251 affs_set_opt(*mount_opts, SF_IMMUTABLE);
252 break;
253 case Opt_reserved:
254 if (match_int(&args[0], reserved))
255 return 0;
256 break;
257 case Opt_root:
258 if (match_int(&args[0], root))
259 return 0;
260 break;
261 case Opt_setgid:
262 if (match_int(&args[0], &option))
263 return 0;
264 *gid = make_kgid(current_user_ns(), option);
265 if (!gid_valid(*gid))
266 return 0;
267 affs_set_opt(*mount_opts, SF_SETGID);
268 break;
269 case Opt_setuid:
270 if (match_int(&args[0], &option))
271 return 0;
272 *uid = make_kuid(current_user_ns(), option);
273 if (!uid_valid(*uid))
274 return 0;
275 affs_set_opt(*mount_opts, SF_SETUID);
276 break;
277 case Opt_verbose:
278 affs_set_opt(*mount_opts, SF_VERBOSE);
279 break;
280 case Opt_volume: {
281 char *vol = match_strdup(&args[0]);
282 if (!vol)
283 return 0;
284 strlcpy(volume, vol, 32);
285 kfree(vol);
286 break;
287 }
288 case Opt_ignore:
289 /* Silently ignore the quota options */
290 break;
291 default:
292 pr_warn("Unrecognized mount option \"%s\" or missing value\n",
293 p);
294 return 0;
295 }
296 }
297 return 1;
298 }
299
300 static int affs_show_options(struct seq_file *m, struct dentry *root)
301 {
302 struct super_block *sb = root->d_sb;
303 struct affs_sb_info *sbi = AFFS_SB(sb);
304
305 if (sb->s_blocksize)
306 seq_printf(m, ",bs=%lu", sb->s_blocksize);
307 if (affs_test_opt(sbi->s_flags, SF_SETMODE))
308 seq_printf(m, ",mode=%o", sbi->s_mode);
309 if (affs_test_opt(sbi->s_flags, SF_MUFS))
310 seq_puts(m, ",mufs");
311 if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
312 seq_puts(m, ",nofilenametruncate");
313 if (affs_test_opt(sbi->s_flags, SF_PREFIX))
314 seq_printf(m, ",prefix=%s", sbi->s_prefix);
315 if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
316 seq_puts(m, ",protect");
317 if (sbi->s_reserved != 2)
318 seq_printf(m, ",reserved=%u", sbi->s_reserved);
319 if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
320 seq_printf(m, ",root=%u", sbi->s_root_block);
321 if (affs_test_opt(sbi->s_flags, SF_SETGID))
322 seq_printf(m, ",setgid=%u",
323 from_kgid_munged(&init_user_ns, sbi->s_gid));
324 if (affs_test_opt(sbi->s_flags, SF_SETUID))
325 seq_printf(m, ",setuid=%u",
326 from_kuid_munged(&init_user_ns, sbi->s_uid));
327 if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
328 seq_puts(m, ",verbose");
329 if (sbi->s_volume[0])
330 seq_printf(m, ",volume=%s", sbi->s_volume);
331 return 0;
332 }
333
334 /* This function definitely needs to be split up. Some fine day I'll
335 * hopefully have the guts to do so. Until then: sorry for the mess.
336 */
337
338 static int affs_fill_super(struct super_block *sb, void *data, int silent)
339 {
340 struct affs_sb_info *sbi;
341 struct buffer_head *root_bh = NULL;
342 struct buffer_head *boot_bh;
343 struct inode *root_inode = NULL;
344 s32 root_block;
345 int size, blocksize;
346 u32 chksum;
347 int num_bm;
348 int i, j;
349 kuid_t uid;
350 kgid_t gid;
351 int reserved;
352 unsigned long mount_flags;
353 int tmp_flags; /* fix remount prototype... */
354 u8 sig[4];
355 int ret;
356
357 pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
358
359 sb->s_magic = AFFS_SUPER_MAGIC;
360 sb->s_op = &affs_sops;
361 sb->s_flags |= SB_NODIRATIME;
362
363 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
364 if (!sbi)
365 return -ENOMEM;
366
367 sb->s_fs_info = sbi;
368 sbi->sb = sb;
369 mutex_init(&sbi->s_bmlock);
370 spin_lock_init(&sbi->symlink_lock);
371 spin_lock_init(&sbi->work_lock);
372 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
373
374 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
375 &blocksize,&sbi->s_prefix,
376 sbi->s_volume, &mount_flags)) {
377 pr_err("Error parsing options\n");
378 return -EINVAL;
379 }
380 /* N.B. after this point s_prefix must be released */
381
382 sbi->s_flags = mount_flags;
383 sbi->s_mode = i;
384 sbi->s_uid = uid;
385 sbi->s_gid = gid;
386 sbi->s_reserved= reserved;
387
388 /* Get the size of the device in 512-byte blocks.
389 * If we later see that the partition uses bigger
390 * blocks, we will have to change it.
391 */
392
393 size = i_size_read(sb->s_bdev->bd_inode) >> 9;
394 pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
395
396 affs_set_blocksize(sb, PAGE_SIZE);
397 /* Try to find root block. Its location depends on the block size. */
398
399 i = bdev_logical_block_size(sb->s_bdev);
400 j = PAGE_SIZE;
401 if (blocksize > 0) {
402 i = j = blocksize;
403 size = size / (blocksize / 512);
404 }
405
406 for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
407 sbi->s_root_block = root_block;
408 if (root_block < 0)
409 sbi->s_root_block = (reserved + size - 1) / 2;
410 pr_debug("setting blocksize to %d\n", blocksize);
411 affs_set_blocksize(sb, blocksize);
412 sbi->s_partition_size = size;
413
414 /* The root block location that was calculated above is not
415 * correct if the partition size is an odd number of 512-
416 * byte blocks, which will be rounded down to a number of
417 * 1024-byte blocks, and if there were an even number of
418 * reserved blocks. Ideally, all partition checkers should
419 * report the real number of blocks of the real blocksize,
420 * but since this just cannot be done, we have to try to
421 * find the root block anyways. In the above case, it is one
422 * block behind the calculated one. So we check this one, too.
423 */
424 for (num_bm = 0; num_bm < 2; num_bm++) {
425 pr_debug("Dev %s, trying root=%u, bs=%d, "
426 "size=%d, reserved=%d\n",
427 sb->s_id,
428 sbi->s_root_block + num_bm,
429 blocksize, size, reserved);
430 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
431 if (!root_bh)
432 continue;
433 if (!affs_checksum_block(sb, root_bh) &&
434 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
435 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
436 sbi->s_hashsize = blocksize / 4 - 56;
437 sbi->s_root_block += num_bm;
438 goto got_root;
439 }
440 affs_brelse(root_bh);
441 root_bh = NULL;
442 }
443 }
444 if (!silent)
445 pr_err("No valid root block on device %s\n", sb->s_id);
446 return -EINVAL;
447
448 /* N.B. after this point bh must be released */
449 got_root:
450 /* Keep super block in cache */
451 sbi->s_root_bh = root_bh;
452 root_block = sbi->s_root_block;
453
454 /* Find out which kind of FS we have */
455 boot_bh = sb_bread(sb, 0);
456 if (!boot_bh) {
457 pr_err("Cannot read boot block\n");
458 return -EINVAL;
459 }
460 memcpy(sig, boot_bh->b_data, 4);
461 brelse(boot_bh);
462 chksum = be32_to_cpu(*(__be32 *)sig);
463
464 /* Dircache filesystems are compatible with non-dircache ones
465 * when reading. As long as they aren't supported, writing is
466 * not recommended.
467 */
468 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
469 || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
470 pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
471 sb->s_flags |= SB_RDONLY;
472 }
473 switch (chksum) {
474 case MUFS_FS:
475 case MUFS_INTLFFS:
476 case MUFS_DCFFS:
477 affs_set_opt(sbi->s_flags, SF_MUFS);
478 /* fall thru */
479 case FS_INTLFFS:
480 case FS_DCFFS:
481 affs_set_opt(sbi->s_flags, SF_INTL);
482 break;
483 case MUFS_FFS:
484 affs_set_opt(sbi->s_flags, SF_MUFS);
485 break;
486 case FS_FFS:
487 break;
488 case MUFS_OFS:
489 affs_set_opt(sbi->s_flags, SF_MUFS);
490 /* fall through */
491 case FS_OFS:
492 affs_set_opt(sbi->s_flags, SF_OFS);
493 sb->s_flags |= SB_NOEXEC;
494 break;
495 case MUFS_DCOFS:
496 case MUFS_INTLOFS:
497 affs_set_opt(sbi->s_flags, SF_MUFS);
498 /* fall through */
499 case FS_DCOFS:
500 case FS_INTLOFS:
501 affs_set_opt(sbi->s_flags, SF_INTL);
502 affs_set_opt(sbi->s_flags, SF_OFS);
503 sb->s_flags |= SB_NOEXEC;
504 break;
505 default:
506 pr_err("Unknown filesystem on device %s: %08X\n",
507 sb->s_id, chksum);
508 return -EINVAL;
509 }
510
511 if (affs_test_opt(mount_flags, SF_VERBOSE)) {
512 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
513 pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
514 len > 31 ? 31 : len,
515 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
516 sig, sig[3] + '0', blocksize);
517 }
518
519 sb->s_flags |= SB_NODEV | SB_NOSUID;
520
521 sbi->s_data_blksize = sb->s_blocksize;
522 if (affs_test_opt(sbi->s_flags, SF_OFS))
523 sbi->s_data_blksize -= 24;
524
525 tmp_flags = sb->s_flags;
526 ret = affs_init_bitmap(sb, &tmp_flags);
527 if (ret)
528 return ret;
529 sb->s_flags = tmp_flags;
530
531 /* set up enough so that it can read an inode */
532
533 root_inode = affs_iget(sb, root_block);
534 if (IS_ERR(root_inode))
535 return PTR_ERR(root_inode);
536
537 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
538 sb->s_d_op = &affs_intl_dentry_operations;
539 else
540 sb->s_d_op = &affs_dentry_operations;
541
542 sb->s_root = d_make_root(root_inode);
543 if (!sb->s_root) {
544 pr_err("AFFS: Get root inode failed\n");
545 return -ENOMEM;
546 }
547
548 sb->s_export_op = &affs_export_ops;
549 pr_debug("s_flags=%lX\n", sb->s_flags);
550 return 0;
551 }
552
553 static int
554 affs_remount(struct super_block *sb, int *flags, char *data)
555 {
556 struct affs_sb_info *sbi = AFFS_SB(sb);
557 int blocksize;
558 kuid_t uid;
559 kgid_t gid;
560 int mode;
561 int reserved;
562 int root_block;
563 unsigned long mount_flags;
564 int res = 0;
565 char *new_opts;
566 char volume[32];
567 char *prefix = NULL;
568
569 new_opts = kstrdup(data, GFP_KERNEL);
570 if (data && !new_opts)
571 return -ENOMEM;
572
573 pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
574
575 sync_filesystem(sb);
576 *flags |= SB_NODIRATIME;
577
578 memcpy(volume, sbi->s_volume, 32);
579 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
580 &blocksize, &prefix, volume,
581 &mount_flags)) {
582 kfree(prefix);
583 kfree(new_opts);
584 return -EINVAL;
585 }
586
587 flush_delayed_work(&sbi->sb_work);
588
589 sbi->s_flags = mount_flags;
590 sbi->s_mode = mode;
591 sbi->s_uid = uid;
592 sbi->s_gid = gid;
593 /* protect against readers */
594 spin_lock(&sbi->symlink_lock);
595 if (prefix) {
596 kfree(sbi->s_prefix);
597 sbi->s_prefix = prefix;
598 }
599 memcpy(sbi->s_volume, volume, 32);
600 spin_unlock(&sbi->symlink_lock);
601
602 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
603 return 0;
604
605 if (*flags & SB_RDONLY)
606 affs_free_bitmap(sb);
607 else
608 res = affs_init_bitmap(sb, flags);
609
610 return res;
611 }
612
613 static int
614 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
615 {
616 struct super_block *sb = dentry->d_sb;
617 int free;
618 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
619
620 pr_debug("%s() partsize=%d, reserved=%d\n",
621 __func__, AFFS_SB(sb)->s_partition_size,
622 AFFS_SB(sb)->s_reserved);
623
624 free = affs_count_free_blocks(sb);
625 buf->f_type = AFFS_SUPER_MAGIC;
626 buf->f_bsize = sb->s_blocksize;
627 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
628 buf->f_bfree = free;
629 buf->f_bavail = free;
630 buf->f_fsid.val[0] = (u32)id;
631 buf->f_fsid.val[1] = (u32)(id >> 32);
632 buf->f_namelen = AFFSNAMEMAX;
633 return 0;
634 }
635
636 static struct dentry *affs_mount(struct file_system_type *fs_type,
637 int flags, const char *dev_name, void *data)
638 {
639 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
640 }
641
642 static void affs_kill_sb(struct super_block *sb)
643 {
644 struct affs_sb_info *sbi = AFFS_SB(sb);
645 kill_block_super(sb);
646 if (sbi) {
647 affs_free_bitmap(sb);
648 affs_brelse(sbi->s_root_bh);
649 kfree(sbi->s_prefix);
650 mutex_destroy(&sbi->s_bmlock);
651 kfree(sbi);
652 }
653 }
654
655 static struct file_system_type affs_fs_type = {
656 .owner = THIS_MODULE,
657 .name = "affs",
658 .mount = affs_mount,
659 .kill_sb = affs_kill_sb,
660 .fs_flags = FS_REQUIRES_DEV,
661 };
662 MODULE_ALIAS_FS("affs");
663
664 static int __init init_affs_fs(void)
665 {
666 int err = init_inodecache();
667 if (err)
668 goto out1;
669 err = register_filesystem(&affs_fs_type);
670 if (err)
671 goto out;
672 return 0;
673 out:
674 destroy_inodecache();
675 out1:
676 return err;
677 }
678
679 static void __exit exit_affs_fs(void)
680 {
681 unregister_filesystem(&affs_fs_type);
682 destroy_inodecache();
683 }
684
685 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
686 MODULE_LICENSE("GPL");
687
688 module_init(init_affs_fs)
689 module_exit(exit_affs_fs)
Ubuntu Hirsute Linux kernel mirror