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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/android/binderfs.c
....@@ -1,4 +1,4 @@
1
-/* SPDX-License-Identifier: GPL-2.0 */
1
+// SPDX-License-Identifier: GPL-2.0
22 
33 #include <linux/compiler_types.h>
44 #include <linux/errno.h>
....@@ -18,7 +18,7 @@
1818 #include <linux/module.h>
1919 #include <linux/mutex.h>
2020 #include <linux/mount.h>
21
-#include <linux/parser.h>
21
+#include <linux/fs_parser.h>
2222 #include <linux/radix-tree.h>
2323 #include <linux/sched.h>
2424 #include <linux/seq_file.h>
....@@ -48,26 +48,30 @@
4848 static DEFINE_MUTEX(binderfs_minors_mutex);
4949 static DEFINE_IDA(binderfs_minors);
5050 
51
-enum {
51
+enum binderfs_param {
5252 	Opt_max,
5353 	Opt_stats_mode,
54
-	Opt_err
5554 };
5655 
5756 enum binderfs_stats_mode {
58
-	STATS_NONE,
59
-	STATS_GLOBAL,
57
+	binderfs_stats_mode_unset,
58
+	binderfs_stats_mode_global,
6059 };
6160 
62
-static const match_table_t tokens = {
63
-	{ Opt_max, "max=%d" },
64
-	{ Opt_stats_mode, "stats=%s" },
65
-	{ Opt_err, NULL     }
61
+static const struct constant_table binderfs_param_stats[] = {
62
+	{ "global", binderfs_stats_mode_global },
63
+	{}
6664 };
6765 
68
-static inline struct binderfs_info *BINDERFS_I(const struct inode *inode)
66
+static const struct fs_parameter_spec binderfs_fs_parameters[] = {
67
+	fsparam_u32("max",	Opt_max),
68
+	fsparam_enum("stats",	Opt_stats_mode, binderfs_param_stats),
69
+	{}
70
+};
71
+
72
+static inline struct binderfs_info *BINDERFS_SB(const struct super_block *sb)
6973 {
70
-	return inode->i_sb->s_fs_info;
74
+	return sb->s_fs_info;
7175 }
7276 
7377 bool is_binderfs_device(const struct inode *inode)
....@@ -246,7 +250,7 @@
246250 static void binderfs_evict_inode(struct inode *inode)
247251 {
248252 	struct binder_device *device = inode->i_private;
249
-	struct binderfs_info *info = BINDERFS_I(inode);
253
+	struct binderfs_info *info = BINDERFS_SB(inode->i_sb);
250254 
251255 	clear_inode(inode);
252256 
....@@ -264,102 +268,90 @@
264268 	}
265269 }
266270 
267
-/**
268
- * binderfs_parse_mount_opts - parse binderfs mount options
269
- * @data: options to set (can be NULL in which case defaults are used)
270
- */
271
-static int binderfs_parse_mount_opts(char *data,
272
-				     struct binderfs_mount_opts *opts)
271
+static int binderfs_fs_context_parse_param(struct fs_context *fc,
272
+					   struct fs_parameter *param)
273273 {
274
-	char *p, *stats;
275
-	opts->max = BINDERFS_MAX_MINOR;
276
-	opts->stats_mode = STATS_NONE;
274
+	int opt;
275
+	struct binderfs_mount_opts *ctx = fc->fs_private;
276
+	struct fs_parse_result result;
277277 
278
-	while ((p = strsep(&data, ",")) != NULL) {
279
-		substring_t args[MAX_OPT_ARGS];
280
-		int token;
281
-		int max_devices;
278
+	opt = fs_parse(fc, binderfs_fs_parameters, param, &result);
279
+	if (opt < 0)
280
+		return opt;
282281 
283
-		if (!*p)
284
-			continue;
282
+	switch (opt) {
283
+	case Opt_max:
284
+		if (result.uint_32 > BINDERFS_MAX_MINOR)
285
+			return invalfc(fc, "Bad value for '%s'", param->key);
285286 
286
-		token = match_token(p, tokens, args);
287
-		switch (token) {
288
-		case Opt_max:
289
-			if (match_int(&args[0], &max_devices) ||
290
-			    (max_devices < 0 ||
291
-			     (max_devices > BINDERFS_MAX_MINOR)))
292
-				return -EINVAL;
287
+		ctx->max = result.uint_32;
288
+		break;
289
+	case Opt_stats_mode:
290
+		if (!capable(CAP_SYS_ADMIN))
291
+			return -EPERM;
293292 
294
-			opts->max = max_devices;
295
-			break;
296
-		case Opt_stats_mode:
297
-			if (!capable(CAP_SYS_ADMIN))
298
-				return -EINVAL;
299
-
300
-			stats = match_strdup(&args[0]);
301
-			if (!stats)
302
-				return -ENOMEM;
303
-
304
-			if (strcmp(stats, "global") != 0) {
305
-				kfree(stats);
306
-				return -EINVAL;
307
-			}
308
-
309
-			opts->stats_mode = STATS_GLOBAL;
310
-			kfree(stats);
311
-			break;
312
-		default:
313
-			pr_err("Invalid mount options\n");
314
-			return -EINVAL;
315
-		}
293
+		ctx->stats_mode = result.uint_32;
294
+		break;
295
+	default:
296
+		return invalfc(fc, "Unsupported parameter '%s'", param->key);
316297 	}
317298 
318299 	return 0;
319300 }
320301 
321
-static int binderfs_remount(struct super_block *sb, int *flags, char *data)
302
+static int binderfs_fs_context_reconfigure(struct fs_context *fc)
322303 {
323
-	int prev_stats_mode, ret;
324
-	struct binderfs_info *info = sb->s_fs_info;
304
+	struct binderfs_mount_opts *ctx = fc->fs_private;
305
+	struct binderfs_info *info = BINDERFS_SB(fc->root->d_sb);
325306 
326
-	prev_stats_mode = info->mount_opts.stats_mode;
327
-	ret = binderfs_parse_mount_opts(data, &info->mount_opts);
328
-	if (ret)
329
-		return ret;
307
+	if (info->mount_opts.stats_mode != ctx->stats_mode)
308
+		return invalfc(fc, "Binderfs stats mode cannot be changed during a remount");
330309 
331
-	if (prev_stats_mode != info->mount_opts.stats_mode) {
332
-		pr_err("Binderfs stats mode cannot be changed during a remount\n");
333
-		info->mount_opts.stats_mode = prev_stats_mode;
334
-		return -EINVAL;
335
-	}
336
-
310
+	info->mount_opts.stats_mode = ctx->stats_mode;
311
+	info->mount_opts.max = ctx->max;
337312 	return 0;
338313 }
339314 
340
-static int binderfs_show_mount_opts(struct seq_file *seq, struct dentry *root)
315
+static int binderfs_show_options(struct seq_file *seq, struct dentry *root)
341316 {
342
-	struct binderfs_info *info;
317
+	struct binderfs_info *info = BINDERFS_SB(root->d_sb);
343318 
344
-	info = root->d_sb->s_fs_info;
345319 	if (info->mount_opts.max <= BINDERFS_MAX_MINOR)
346320 		seq_printf(seq, ",max=%d", info->mount_opts.max);
347
-	if (info->mount_opts.stats_mode == STATS_GLOBAL)
321
+
322
+	switch (info->mount_opts.stats_mode) {
323
+	case binderfs_stats_mode_unset:
324
+		break;
325
+	case binderfs_stats_mode_global:
348326 		seq_printf(seq, ",stats=global");
327
+		break;
328
+	}
349329 
350330 	return 0;
331
+}
332
+
333
+static void binderfs_put_super(struct super_block *sb)
334
+{
335
+	struct binderfs_info *info = sb->s_fs_info;
336
+
337
+	if (info && info->ipc_ns)
338
+		put_ipc_ns(info->ipc_ns);
339
+
340
+	kfree(info);
341
+	sb->s_fs_info = NULL;
351342 }
352343 
353344 static const struct super_operations binderfs_super_ops = {
354345 	.evict_inode    = binderfs_evict_inode,
355
-	.remount_fs	= binderfs_remount,
356
-	.show_options	= binderfs_show_mount_opts,
346
+	.show_options	= binderfs_show_options,
357347 	.statfs         = simple_statfs,
348
+	.put_super	= binderfs_put_super,
358349 };
359350 
360351 static inline bool is_binderfs_control_device(const struct dentry *dentry)
361352 {
362353 	struct binderfs_info *info = dentry->d_sb->s_fs_info;
354
+
363355 	return info->control_dentry == dentry;
364356 }
365357 
....@@ -592,6 +584,7 @@
592584 static int init_binder_logs(struct super_block *sb)
593585 {
594586 	struct dentry *binder_logs_root_dir, *dentry, *proc_log_dir;
587
+	const struct binder_debugfs_entry *db_entry;
595588 	struct binderfs_info *info;
596589 	int ret = 0;
597590 
....@@ -602,43 +595,15 @@
602595 		goto out;
603596 	}
604597 
605
-	dentry = binderfs_create_file(binder_logs_root_dir, "stats",
606
-				      &binder_stats_fops, NULL);
607
-	if (IS_ERR(dentry)) {
608
-		ret = PTR_ERR(dentry);
609
-		goto out;
610
-	}
611
-
612
-	dentry = binderfs_create_file(binder_logs_root_dir, "state",
613
-				      &binder_state_fops, NULL);
614
-	if (IS_ERR(dentry)) {
615
-		ret = PTR_ERR(dentry);
616
-		goto out;
617
-	}
618
-
619
-	dentry = binderfs_create_file(binder_logs_root_dir, "transactions",
620
-				      &binder_transactions_fops, NULL);
621
-	if (IS_ERR(dentry)) {
622
-		ret = PTR_ERR(dentry);
623
-		goto out;
624
-	}
625
-
626
-	dentry = binderfs_create_file(binder_logs_root_dir,
627
-				      "transaction_log",
628
-				      &binder_transaction_log_fops,
629
-				      &binder_transaction_log);
630
-	if (IS_ERR(dentry)) {
631
-		ret = PTR_ERR(dentry);
632
-		goto out;
633
-	}
634
-
635
-	dentry = binderfs_create_file(binder_logs_root_dir,
636
-				      "failed_transaction_log",
637
-				      &binder_transaction_log_fops,
638
-				      &binder_transaction_log_failed);
639
-	if (IS_ERR(dentry)) {
640
-		ret = PTR_ERR(dentry);
641
-		goto out;
598
+	binder_for_each_debugfs_entry(db_entry) {
599
+		dentry = binderfs_create_file(binder_logs_root_dir,
600
+					      db_entry->name,
601
+					      db_entry->fops,
602
+					      db_entry->data);
603
+		if (IS_ERR(dentry)) {
604
+			ret = PTR_ERR(dentry);
605
+			goto out;
606
+		}
642607 	}
643608 
644609 	proc_log_dir = binderfs_create_dir(binder_logs_root_dir, "proc");
....@@ -653,12 +618,13 @@
653618 	return ret;
654619 }
655620 
656
-static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
621
+static int binderfs_fill_super(struct super_block *sb, struct fs_context *fc)
657622 {
658623 	int ret;
659624 	struct binderfs_info *info;
625
+	struct binderfs_mount_opts *ctx = fc->fs_private;
660626 	struct inode *inode = NULL;
661
-	struct binderfs_device device_info = { 0 };
627
+	struct binderfs_device device_info = {};
662628 	const char *name;
663629 	size_t len;
664630 
....@@ -689,16 +655,14 @@
689655 
690656 	info->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns);
691657 
692
-	ret = binderfs_parse_mount_opts(data, &info->mount_opts);
693
-	if (ret)
694
-		return ret;
695
-
696658 	info->root_gid = make_kgid(sb->s_user_ns, 0);
697659 	if (!gid_valid(info->root_gid))
698660 		info->root_gid = GLOBAL_ROOT_GID;
699661 	info->root_uid = make_kuid(sb->s_user_ns, 0);
700662 	if (!uid_valid(info->root_uid))
701663 		info->root_uid = GLOBAL_ROOT_UID;
664
+	info->mount_opts.max = ctx->max;
665
+	info->mount_opts.stats_mode = ctx->stats_mode;
702666 
703667 	inode = new_inode(sb);
704668 	if (!inode)
....@@ -730,36 +694,54 @@
730694 			name++;
731695 	}
732696 
733
-	if (info->mount_opts.stats_mode == STATS_GLOBAL)
697
+	if (info->mount_opts.stats_mode == binderfs_stats_mode_global)
734698 		return init_binder_logs(sb);
735699 
736700 	return 0;
737701 }
738702 
739
-static struct dentry *binderfs_mount(struct file_system_type *fs_type,
740
-				     int flags, const char *dev_name,
741
-				     void *data)
703
+static int binderfs_fs_context_get_tree(struct fs_context *fc)
742704 {
743
-	return mount_nodev(fs_type, flags, data, binderfs_fill_super);
705
+	return get_tree_nodev(fc, binderfs_fill_super);
744706 }
745707 
746
-static void binderfs_kill_super(struct super_block *sb)
708
+static void binderfs_fs_context_free(struct fs_context *fc)
747709 {
748
-	struct binderfs_info *info = sb->s_fs_info;
710
+	struct binderfs_mount_opts *ctx = fc->fs_private;
749711 
750
-	kill_litter_super(sb);
712
+	kfree(ctx);
713
+}
751714 
752
-	if (info && info->ipc_ns)
753
-		put_ipc_ns(info->ipc_ns);
715
+static const struct fs_context_operations binderfs_fs_context_ops = {
716
+	.free		= binderfs_fs_context_free,
717
+	.get_tree	= binderfs_fs_context_get_tree,
718
+	.parse_param	= binderfs_fs_context_parse_param,
719
+	.reconfigure	= binderfs_fs_context_reconfigure,
720
+};
754721 
755
-	kfree(info);
722
+static int binderfs_init_fs_context(struct fs_context *fc)
723
+{
724
+	struct binderfs_mount_opts *ctx;
725
+
726
+	ctx = kzalloc(sizeof(struct binderfs_mount_opts), GFP_KERNEL);
727
+	if (!ctx)
728
+		return -ENOMEM;
729
+
730
+	ctx->max = BINDERFS_MAX_MINOR;
731
+	ctx->stats_mode = binderfs_stats_mode_unset;
732
+
733
+	fc->fs_private = ctx;
734
+	fc->ops = &binderfs_fs_context_ops;
735
+
736
+	return 0;
756737 }
757738 
758739 static struct file_system_type binder_fs_type = {
759
-	.name		= "binder",
760
-	.mount		= binderfs_mount,
761
-	.kill_sb	= binderfs_kill_super,
762
-	.fs_flags	= FS_USERNS_MOUNT,
740
+	.name			= "binder",
741
+	.init_fs_context	= binderfs_init_fs_context,
742
+	.parameters		= binderfs_fs_parameters,
743
+	.kill_sb		= kill_litter_super,
744
+	.fs_flags		= FS_USERNS_MOUNT,
763745 };
764746 
765747 int __init init_binderfs(void)