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2024-09-20 cf4ce59b3b70238352c7f1729f0f7223214828ad 
 kernel/fs/adfs/super.c
....@@ -1,44 +1,58 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  linux/fs/adfs/super.c
34  *
45  *  Copyright (C) 1997-1999 Russell King
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License version 2 as
8
- * published by the Free Software Foundation.
96  */
107 #include <linux/module.h>
118 #include <linux/init.h>
12
-#include <linux/buffer_head.h>
139 #include <linux/parser.h>
1410 #include <linux/mount.h>
1511 #include <linux/seq_file.h>
1612 #include <linux/slab.h>
1713 #include <linux/statfs.h>
1814 #include <linux/user_namespace.h>
15
+#include <linux/blkdev.h>
1916 #include "adfs.h"
2017 #include "dir_f.h"
2118 #include "dir_fplus.h"
19
+
20
+#define ADFS_SB_FLAGS SB_NOATIME
2221 
2322 #define ADFS_DEFAULT_OWNER_MASK S_IRWXU
2423 #define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)
2524 
2625 void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...)
2726 {
28
-	char error_buf[128];
27
+	struct va_format vaf;
2928 	va_list args;
3029 
3130 	va_start(args, fmt);
32
-	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
33
-	va_end(args);
31
+	vaf.fmt = fmt;
32
+	vaf.va = &args;
3433 
35
-	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n",
34
+	printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %pV\n",
3635 		sb->s_id, function ? ": " : "",
37
-		function ? function : "", error_buf);
36
+		function ? function : "", &vaf);
37
+
38
+	va_end(args);
39
+}
40
+
41
+void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...)
42
+{
43
+	struct va_format vaf;
44
+	va_list args;
45
+
46
+	va_start(args, fmt);
47
+	vaf.fmt = fmt;
48
+	vaf.va = &args;
49
+	printk("%sADFS-fs (%s): %pV\n", pfx, sb->s_id, &vaf);
50
+	va_end(args);
3851 }
3952 
4053 static int adfs_checkdiscrecord(struct adfs_discrecord *dr)
4154 {
55
+	unsigned int max_idlen;
4256 	int i;
4357 
4458 	/* sector size must be 256, 512 or 1024 bytes */
....@@ -58,8 +72,13 @@
5872 	if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize)
5973 		return 1;
6074 
61
-	/* idlen must be no greater than 19 v2 [1.0] */
62
-	if (dr->idlen > 19)
75
+	/*
76
+	 * Maximum idlen is limited to 16 bits for new directories by
77
+	 * the three-byte storage of an indirect disc address.  For
78
+	 * big directories, idlen must be no greater than 19 v2 [1.0]
79
+	 */
80
+	max_idlen = dr->format_version ? 19 : 16;
81
+	if (dr->idlen > max_idlen)
6382 		return 1;
6483 
6584 	/* reserved bytes should be zero */
....@@ -70,59 +89,11 @@
7089 	return 0;
7190 }
7291 
73
-static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map)
74
-{
75
-	unsigned int v0, v1, v2, v3;
76
-	int i;
77
-
78
-	v0 = v1 = v2 = v3 = 0;
79
-	for (i = sb->s_blocksize - 4; i; i -= 4) {
80
-		v0 += map[i]     + (v3 >> 8);
81
-		v3 &= 0xff;
82
-		v1 += map[i + 1] + (v0 >> 8);
83
-		v0 &= 0xff;
84
-		v2 += map[i + 2] + (v1 >> 8);
85
-		v1 &= 0xff;
86
-		v3 += map[i + 3] + (v2 >> 8);
87
-		v2 &= 0xff;
88
-	}
89
-	v0 +=           v3 >> 8;
90
-	v1 += map[1] + (v0 >> 8);
91
-	v2 += map[2] + (v1 >> 8);
92
-	v3 += map[3] + (v2 >> 8);
93
-
94
-	return v0 ^ v1 ^ v2 ^ v3;
95
-}
96
-
97
-static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm)
98
-{
99
-	unsigned char crosscheck = 0, zonecheck = 1;
100
-	int i;
101
-
102
-	for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) {
103
-		unsigned char *map;
104
-
105
-		map = dm[i].dm_bh->b_data;
106
-
107
-		if (adfs_calczonecheck(sb, map) != map[0]) {
108
-			adfs_error(sb, "zone %d fails zonecheck", i);
109
-			zonecheck = 0;
110
-		}
111
-		crosscheck ^= map[3];
112
-	}
113
-	if (crosscheck != 0xff)
114
-		adfs_error(sb, "crosscheck != 0xff");
115
-	return crosscheck == 0xff && zonecheck;
116
-}
117
-
11892 static void adfs_put_super(struct super_block *sb)
11993 {
120
-	int i;
12194 	struct adfs_sb_info *asb = ADFS_SB(sb);
12295 
123
-	for (i = 0; i < asb->s_map_size; i++)
124
-		brelse(asb->s_map[i].dm_bh);
125
-	kfree(asb->s_map);
96
+	adfs_free_map(sb);
12697 	kfree_rcu(asb, rcu);
12798 }
12899 
....@@ -155,10 +126,10 @@
155126 	{Opt_err, NULL}
156127 };
157128 
158
-static int parse_options(struct super_block *sb, char *options)
129
+static int parse_options(struct super_block *sb, struct adfs_sb_info *asb,
130
+			 char *options)
159131 {
160132 	char *p;
161
-	struct adfs_sb_info *asb = ADFS_SB(sb);
162133 	int option;
163134 
164135 	if (!options)
....@@ -202,8 +173,9 @@
202173 			asb->s_ftsuffix = option;
203174 			break;
204175 		default:
205
-			printk("ADFS-fs: unrecognised mount option \"%s\" "
206
-					"or missing value\n", p);
176
+			adfs_msg(sb, KERN_ERR,
177
+				 "unrecognised mount option \"%s\" or missing value",
178
+				 p);
207179 			return -EINVAL;
208180 		}
209181 	}
....@@ -212,9 +184,18 @@
212184 
213185 static int adfs_remount(struct super_block *sb, int *flags, char *data)
214186 {
187
+	struct adfs_sb_info temp_asb;
188
+	int ret;
189
+
215190 	sync_filesystem(sb);
216
-	*flags |= SB_NODIRATIME;
217
-	return parse_options(sb, data);
191
+	*flags |= ADFS_SB_FLAGS;
192
+
193
+	temp_asb = *ADFS_SB(sb);
194
+	ret = parse_options(sb, &temp_asb, data);
195
+	if (ret == 0)
196
+		*ADFS_SB(sb) = temp_asb;
197
+
198
+	return ret;
218199 }
219200 
220201 static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
....@@ -223,16 +204,13 @@
223204 	struct adfs_sb_info *sbi = ADFS_SB(sb);
224205 	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
225206 
207
+	adfs_map_statfs(sb, buf);
208
+
226209 	buf->f_type    = ADFS_SUPER_MAGIC;
227210 	buf->f_namelen = sbi->s_namelen;
228211 	buf->f_bsize   = sb->s_blocksize;
229
-	buf->f_blocks  = sbi->s_size;
230
-	buf->f_files   = sbi->s_ids_per_zone * sbi->s_map_size;
231
-	buf->f_bavail  =
232
-	buf->f_bfree   = adfs_map_free(sb);
233212 	buf->f_ffree   = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
234
-	buf->f_fsid.val[0] = (u32)id;
235
-	buf->f_fsid.val[1] = (u32)(id >> 32);
213
+	buf->f_fsid    = u64_to_fsid(id);
236214 
237215 	return 0;
238216 }
....@@ -248,15 +226,15 @@
248226 	return &ei->vfs_inode;
249227 }
250228 
251
-static void adfs_i_callback(struct rcu_head *head)
229
+static void adfs_free_inode(struct inode *inode)
252230 {
253
-	struct inode *inode = container_of(head, struct inode, i_rcu);
254231 	kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
255232 }
256233 
257
-static void adfs_destroy_inode(struct inode *inode)
234
+static int adfs_drop_inode(struct inode *inode)
258235 {
259
-	call_rcu(&inode->i_rcu, adfs_i_callback);
236
+	/* always drop inodes if we are read-only */
237
+	return !IS_ENABLED(CONFIG_ADFS_FS_RW) || IS_RDONLY(inode);
260238 }
261239 
262240 static void init_once(void *foo)
....@@ -290,8 +268,8 @@
290268 
291269 static const struct super_operations adfs_sops = {
292270 	.alloc_inode	= adfs_alloc_inode,
293
-	.destroy_inode	= adfs_destroy_inode,
294
-	.drop_inode	= generic_delete_inode,
271
+	.free_inode	= adfs_free_inode,
272
+	.drop_inode	= adfs_drop_inode,
295273 	.write_inode	= adfs_write_inode,
296274 	.put_super	= adfs_put_super,
297275 	.statfs		= adfs_statfs,
....@@ -299,87 +277,107 @@
299277 	.show_options	= adfs_show_options,
300278 };
301279 
302
-static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr)
280
+static int adfs_probe(struct super_block *sb, unsigned int offset, int silent,
281
+		      int (*validate)(struct super_block *sb,
282
+				      struct buffer_head *bh,
283
+				      struct adfs_discrecord **bhp))
303284 {
304
-	struct adfs_discmap *dm;
305
-	unsigned int map_addr, zone_size, nzones;
306
-	int i, zone;
307285 	struct adfs_sb_info *asb = ADFS_SB(sb);
286
+	struct adfs_discrecord *dr;
287
+	struct buffer_head *bh;
288
+	unsigned int blocksize = BLOCK_SIZE;
289
+	int ret, try;
308290 
309
-	nzones    = asb->s_map_size;
310
-	zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare);
311
-	map_addr  = (nzones >> 1) * zone_size -
312
-		     ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0);
313
-	map_addr  = signed_asl(map_addr, asb->s_map2blk);
314
-
315
-	asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1);
316
-
317
-	dm = kmalloc_array(nzones, sizeof(*dm), GFP_KERNEL);
318
-	if (dm == NULL) {
319
-		adfs_error(sb, "not enough memory");
320
-		return ERR_PTR(-ENOMEM);
321
-	}
322
-
323
-	for (zone = 0; zone < nzones; zone++, map_addr++) {
324
-		dm[zone].dm_startbit = 0;
325
-		dm[zone].dm_endbit   = zone_size;
326
-		dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS;
327
-		dm[zone].dm_bh       = sb_bread(sb, map_addr);
328
-
329
-		if (!dm[zone].dm_bh) {
330
-			adfs_error(sb, "unable to read map");
331
-			goto error_free;
291
+	for (try = 0; try < 2; try++) {
292
+		/* try to set the requested block size */
293
+		if (sb->s_blocksize != blocksize &&
294
+		    !sb_set_blocksize(sb, blocksize)) {
295
+			if (!silent)
296
+				adfs_msg(sb, KERN_ERR,
297
+					 "error: unsupported blocksize");
298
+			return -EINVAL;
332299 		}
300
+
301
+		/* read the buffer */
302
+		bh = sb_bread(sb, offset >> sb->s_blocksize_bits);
303
+		if (!bh) {
304
+			adfs_msg(sb, KERN_ERR,
305
+				 "error: unable to read block %u, try %d",
306
+				 offset >> sb->s_blocksize_bits, try);
307
+			return -EIO;
308
+		}
309
+
310
+		/* validate it */
311
+		ret = validate(sb, bh, &dr);
312
+		if (ret) {
313
+			brelse(bh);
314
+			return ret;
315
+		}
316
+
317
+		/* does the block size match the filesystem block size? */
318
+		blocksize = 1 << dr->log2secsize;
319
+		if (sb->s_blocksize == blocksize) {
320
+			asb->s_map = adfs_read_map(sb, dr);
321
+			brelse(bh);
322
+			return PTR_ERR_OR_ZERO(asb->s_map);
323
+		}
324
+
325
+		brelse(bh);
333326 	}
334327 
335
-	/* adjust the limits for the first and last map zones */
336
-	i = zone - 1;
337
-	dm[0].dm_startblk = 0;
338
-	dm[0].dm_startbit = ADFS_DR_SIZE_BITS;
339
-	dm[i].dm_endbit   = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) +
340
-			    (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) +
341
-			    (ADFS_DR_SIZE_BITS - i * zone_size);
342
-
343
-	if (adfs_checkmap(sb, dm))
344
-		return dm;
345
-
346
-	adfs_error(sb, "map corrupted");
347
-
348
-error_free:
349
-	while (--zone >= 0)
350
-		brelse(dm[zone].dm_bh);
351
-
352
-	kfree(dm);
353
-	return ERR_PTR(-EIO);
328
+	return -EIO;
354329 }
355330 
356
-static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits)
331
+static int adfs_validate_bblk(struct super_block *sb, struct buffer_head *bh,
332
+			      struct adfs_discrecord **drp)
357333 {
358
-	unsigned long discsize;
334
+	struct adfs_discrecord *dr;
335
+	unsigned char *b_data;
359336 
360
-	discsize  = le32_to_cpu(dr->disc_size_high) << (32 - block_bits);
361
-	discsize |= le32_to_cpu(dr->disc_size) >> block_bits;
337
+	b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
338
+	if (adfs_checkbblk(b_data))
339
+		return -EILSEQ;
362340 
363
-	return discsize;
341
+	/* Do some sanity checks on the ADFS disc record */
342
+	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
343
+	if (adfs_checkdiscrecord(dr))
344
+		return -EILSEQ;
345
+
346
+	*drp = dr;
347
+	return 0;
348
+}
349
+
350
+static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh,
351
+			      struct adfs_discrecord **drp)
352
+{
353
+	struct adfs_discrecord *dr;
354
+
355
+	/* Do some sanity checks on the ADFS disc record */
356
+	dr = (struct adfs_discrecord *)(bh->b_data + 4);
357
+	if (adfs_checkdiscrecord(dr) || dr->nzones_high || dr->nzones != 1)
358
+		return -EILSEQ;
359
+
360
+	*drp = dr;
361
+	return 0;
364362 }
365363 
366364 static int adfs_fill_super(struct super_block *sb, void *data, int silent)
367365 {
368366 	struct adfs_discrecord *dr;
369
-	struct buffer_head *bh;
370367 	struct object_info root_obj;
371
-	unsigned char *b_data;
372
-	unsigned int blocksize;
373368 	struct adfs_sb_info *asb;
374369 	struct inode *root;
375370 	int ret = -EINVAL;
376371 
377
-	sb->s_flags |= SB_NODIRATIME;
372
+	sb->s_flags |= ADFS_SB_FLAGS;
378373 
379374 	asb = kzalloc(sizeof(*asb), GFP_KERNEL);
380375 	if (!asb)
381376 		return -ENOMEM;
377
+
382378 	sb->s_fs_info = asb;
379
+	sb->s_magic = ADFS_SUPER_MAGIC;
380
+	sb->s_time_gran = 10000000;
383381 
384382 	/* set default options */
385383 	asb->s_uid = GLOBAL_ROOT_UID;
....@@ -388,93 +386,29 @@
388386 	asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
389387 	asb->s_ftsuffix = 0;
390388 
391
-	if (parse_options(sb, data))
389
+	if (parse_options(sb, asb, data))
392390 		goto error;
393391 
394
-	sb_set_blocksize(sb, BLOCK_SIZE);
395
-	if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) {
396
-		adfs_error(sb, "unable to read superblock");
397
-		ret = -EIO;
392
+	/* Try to probe the filesystem boot block */
393
+	ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk);
394
+	if (ret == -EILSEQ)
395
+		ret = adfs_probe(sb, 0, silent, adfs_validate_dr0);
396
+	if (ret == -EILSEQ) {
397
+		if (!silent)
398
+			adfs_msg(sb, KERN_ERR,
399
+				 "error: can't find an ADFS filesystem on dev %s.",
400
+				 sb->s_id);
401
+		ret = -EINVAL;
402
+	}
403
+	if (ret)
398404 		goto error;
399
-	}
400405 
401
-	b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE);
402
-
403
-	if (adfs_checkbblk(b_data)) {
404
-		if (!silent)
405
-			printk("VFS: Can't find an adfs filesystem on dev "
406
-				"%s.\n", sb->s_id);
407
-		ret = -EINVAL;
408
-		goto error_free_bh;
409
-	}
410
-
411
-	dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
412
-
413
-	/*
414
-	 * Do some sanity checks on the ADFS disc record
415
-	 */
416
-	if (adfs_checkdiscrecord(dr)) {
417
-		if (!silent)
418
-			printk("VPS: Can't find an adfs filesystem on dev "
419
-				"%s.\n", sb->s_id);
420
-		ret = -EINVAL;
421
-		goto error_free_bh;
422
-	}
423
-
424
-	blocksize = 1 << dr->log2secsize;
425
-	brelse(bh);
426
-
427
-	if (sb_set_blocksize(sb, blocksize)) {
428
-		bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize);
429
-		if (!bh) {
430
-			adfs_error(sb, "couldn't read superblock on "
431
-				"2nd try.");
432
-			ret = -EIO;
433
-			goto error;
434
-		}
435
-		b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize);
436
-		if (adfs_checkbblk(b_data)) {
437
-			adfs_error(sb, "disc record mismatch, very weird!");
438
-			ret = -EINVAL;
439
-			goto error_free_bh;
440
-		}
441
-		dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET);
442
-	} else {
443
-		if (!silent)
444
-			printk(KERN_ERR "VFS: Unsupported blocksize on dev "
445
-				"%s.\n", sb->s_id);
446
-		ret = -EINVAL;
447
-		goto error;
448
-	}
449
-
450
-	/*
451
-	 * blocksize on this device should now be set to the ADFS log2secsize
452
-	 */
453
-
454
-	sb->s_magic		= ADFS_SUPER_MAGIC;
455
-	asb->s_idlen		= dr->idlen;
456
-	asb->s_map_size		= dr->nzones | (dr->nzones_high << 8);
457
-	asb->s_map2blk		= dr->log2bpmb - dr->log2secsize;
458
-	asb->s_size    		= adfs_discsize(dr, sb->s_blocksize_bits);
459
-	asb->s_version 		= dr->format_version;
460
-	asb->s_log2sharesize	= dr->log2sharesize;
461
-
462
-	asb->s_map = adfs_read_map(sb, dr);
463
-	if (IS_ERR(asb->s_map)) {
464
-		ret =  PTR_ERR(asb->s_map);
465
-		goto error_free_bh;
466
-	}
467
-
468
-	brelse(bh);
469
-
470
-	/*
471
-	 * set up enough so that we can read an inode
472
-	 */
406
+	/* set up enough so that we can read an inode */
473407 	sb->s_op = &adfs_sops;
474408 
475
-	dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4);
409
+	dr = adfs_map_discrecord(asb->s_map);
476410 
477
-	root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
411
+	root_obj.parent_id = root_obj.indaddr = le32_to_cpu(dr->root);
478412 	root_obj.name_len  = 0;
479413 	/* Set root object date as 01 Jan 1987 00:00:00 */
480414 	root_obj.loadaddr  = 0xfff0003f;
....@@ -482,13 +416,12 @@
482416 	root_obj.size	   = ADFS_NEWDIR_SIZE;
483417 	root_obj.attr	   = ADFS_NDA_DIRECTORY   | ADFS_NDA_OWNER_READ |
484418 			     ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
485
-	root_obj.filetype  = -1;
486419 
487420 	/*
488421 	 * If this is a F+ disk with variable length directories,
489422 	 * get the root_size from the disc record.
490423 	 */
491
-	if (asb->s_version) {
424
+	if (dr->format_version) {
492425 		root_obj.size = le32_to_cpu(dr->root_size);
493426 		asb->s_dir     = &adfs_fplus_dir_ops;
494427 		asb->s_namelen = ADFS_FPLUS_NAME_LEN;
....@@ -507,18 +440,13 @@
507440 	root = adfs_iget(sb, &root_obj);
508441 	sb->s_root = d_make_root(root);
509442 	if (!sb->s_root) {
510
-		int i;
511
-		for (i = 0; i < asb->s_map_size; i++)
512
-			brelse(asb->s_map[i].dm_bh);
513
-		kfree(asb->s_map);
443
+		adfs_free_map(sb);
514444 		adfs_error(sb, "get root inode failed\n");
515445 		ret = -EIO;
516446 		goto error;
517447 	}
518448 	return 0;
519449 
520
-error_free_bh:
521
-	brelse(bh);
522450 error:
523451 	sb->s_fs_info = NULL;
524452 	kfree(asb);
....@@ -564,3 +492,4 @@
564492 module_init(init_adfs_fs)
565493 module_exit(exit_adfs_fs)
566494 MODULE_LICENSE("GPL");
495
+MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);