add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/mm/shmem.c
..
..
@@ -285,10 +285,10 @@
285
285
 	ino_t ino;
286
286
 
287
287
 	if (!(sb->s_flags & SB_KERNMOUNT)) {
288
-		raw_spin_lock(&sbinfo->stat_lock);
288
+		spin_lock(&sbinfo->stat_lock);
289
289
 		if (sbinfo->max_inodes) {
290
290
 			if (!sbinfo->free_inodes) {
291
-				raw_spin_unlock(&sbinfo->stat_lock);
291
+				spin_unlock(&sbinfo->stat_lock);
292
292
 				return -ENOSPC;
293
293
 			}
294
294
 			sbinfo->free_inodes--;
..
..
@@ -311,7 +311,7 @@
311
311
 			}
312
312
 			*inop = ino;
313
313
 		}
314
-		raw_spin_unlock(&sbinfo->stat_lock);
314
+		spin_unlock(&sbinfo->stat_lock);
315
315
 	} else if (inop) {
316
316
 		/*
317
317
 		 * __shmem_file_setup, one of our callers, is lock-free: it
..
..
@@ -326,14 +326,13 @@
326
326
 		 * to worry about things like glibc compatibility.
327
327
 		 */
328
328
 		ino_t *next_ino;
329
-
330
329
 		next_ino = per_cpu_ptr(sbinfo->ino_batch, get_cpu());
331
330
 		ino = *next_ino;
332
331
 		if (unlikely(ino % SHMEM_INO_BATCH == 0)) {
333
-			raw_spin_lock(&sbinfo->stat_lock);
332
+			spin_lock(&sbinfo->stat_lock);
334
333
 			ino = sbinfo->next_ino;
335
334
 			sbinfo->next_ino += SHMEM_INO_BATCH;
336
-			raw_spin_unlock(&sbinfo->stat_lock);
335
+			spin_unlock(&sbinfo->stat_lock);
337
336
 			if (unlikely(is_zero_ino(ino)))
338
337
 				ino++;
339
338
 		}
..
..
@@ -349,9 +348,9 @@
349
348
 {
350
349
 	struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
351
350
 	if (sbinfo->max_inodes) {
352
-		raw_spin_lock(&sbinfo->stat_lock);
351
+		spin_lock(&sbinfo->stat_lock);
353
352
 		sbinfo->free_inodes++;
354
-		raw_spin_unlock(&sbinfo->stat_lock);
353
+		spin_unlock(&sbinfo->stat_lock);
355
354
 	}
356
355
 }
357
356
 
..
..
@@ -1493,10 +1492,10 @@
1493
1492
 {
1494
1493
 	struct mempolicy *mpol = NULL;
1495
1494
 	if (sbinfo->mpol) {
1496
-		raw_spin_lock(&sbinfo->stat_lock);	/* prevent replace/use races */
1495
+		spin_lock(&sbinfo->stat_lock);	/* prevent replace/use races */
1497
1496
 		mpol = sbinfo->mpol;
1498
1497
 		mpol_get(mpol);
1499
-		raw_spin_unlock(&sbinfo->stat_lock);
1498
+		spin_unlock(&sbinfo->stat_lock);
1500
1499
 	}
1501
1500
 	return mpol;
1502
1501
 }
..
..
@@ -3425,6 +3424,8 @@
3425
3424
 	unsigned long long size;
3426
3425
 	char *rest;
3427
3426
 	int opt;
3427
+	kuid_t kuid;
3428
+	kgid_t kgid;
3428
3429
 
3429
3430
 	opt = fs_parse(fc, shmem_fs_parameters, param, &result);
3430
3431
 	if (opt < 0)
..
..
@@ -3460,14 +3461,32 @@
3460
3461
 		ctx->mode = result.uint_32 & 07777;
3461
3462
 		break;
3462
3463
 	case Opt_uid:
3463
-		ctx->uid = make_kuid(current_user_ns(), result.uint_32);
3464
-		if (!uid_valid(ctx->uid))
3464
+		kuid = make_kuid(current_user_ns(), result.uint_32);
3465
+		if (!uid_valid(kuid))
3465
3466
 			goto bad_value;
3467
+
3468
+		/*
3469
+		 * The requested uid must be representable in the
3470
+		 * filesystem's idmapping.
3471
+		 */
3472
+		if (!kuid_has_mapping(fc->user_ns, kuid))
3473
+			goto bad_value;
3474
+
3475
+		ctx->uid = kuid;
3466
3476
 		break;
3467
3477
 	case Opt_gid:
3468
-		ctx->gid = make_kgid(current_user_ns(), result.uint_32);
3469
-		if (!gid_valid(ctx->gid))
3478
+		kgid = make_kgid(current_user_ns(), result.uint_32);
3479
+		if (!gid_valid(kgid))
3470
3480
 			goto bad_value;
3481
+
3482
+		/*
3483
+		 * The requested gid must be representable in the
3484
+		 * filesystem's idmapping.
3485
+		 */
3486
+		if (!kgid_has_mapping(fc->user_ns, kgid))
3487
+			goto bad_value;
3488
+
3489
+		ctx->gid = kgid;
3471
3490
 		break;
3472
3491
 	case Opt_huge:
3473
3492
 		ctx->huge = result.uint_32;
..
..
@@ -3563,10 +3582,9 @@
3563
3582
 	struct shmem_options *ctx = fc->fs_private;
3564
3583
 	struct shmem_sb_info *sbinfo = SHMEM_SB(fc->root->d_sb);
3565
3584
 	unsigned long inodes;
3566
-	struct mempolicy *mpol = NULL;
3567
3585
 	const char *err;
3568
3586
 
3569
-	raw_spin_lock(&sbinfo->stat_lock);
3587
+	spin_lock(&sbinfo->stat_lock);
3570
3588
 	inodes = sbinfo->max_inodes - sbinfo->free_inodes;
3571
3589
 	if ((ctx->seen & SHMEM_SEEN_BLOCKS) && ctx->blocks) {
3572
3590
 		if (!sbinfo->max_blocks) {
..
..
@@ -3611,15 +3629,14 @@
3611
3629
 	 * Preserve previous mempolicy unless mpol remount option was specified.
3612
3630
 	 */
3613
3631
 	if (ctx->mpol) {
3614
-		mpol = sbinfo->mpol;
3632
+		mpol_put(sbinfo->mpol);
3615
3633
 		sbinfo->mpol = ctx->mpol;	/* transfers initial ref */
3616
3634
 		ctx->mpol = NULL;
3617
3635
 	}
3618
-	raw_spin_unlock(&sbinfo->stat_lock);
3619
-	mpol_put(mpol);
3636
+	spin_unlock(&sbinfo->stat_lock);
3620
3637
 	return 0;
3621
3638
 out:
3622
-	raw_spin_unlock(&sbinfo->stat_lock);
3639
+	spin_unlock(&sbinfo->stat_lock);
3623
3640
 	return invalfc(fc, "%s", err);
3624
3641
 }
3625
3642
 
..
..
@@ -3736,7 +3753,7 @@
3736
3753
 	sbinfo->mpol = ctx->mpol;
3737
3754
 	ctx->mpol = NULL;
3738
3755
 
3739
-	raw_spin_lock_init(&sbinfo->stat_lock);
3756
+	spin_lock_init(&sbinfo->stat_lock);
3740
3757
 	if (percpu_counter_init(&sbinfo->used_blocks, 0, GFP_KERNEL))
3741
3758
 		goto failed;
3742
3759
 	spin_lock_init(&sbinfo->shrinklist_lock);
..
..
@@ -4103,7 +4120,7 @@
4103
4120
 	.name		= "tmpfs",
4104
4121
 	.init_fs_context = ramfs_init_fs_context,
4105
4122
 	.parameters	= ramfs_fs_parameters,
4106
-	.kill_sb	= kill_litter_super,
4123
+	.kill_sb	= ramfs_kill_sb,
4107
4124
 	.fs_flags	= FS_USERNS_MOUNT,
4108
4125
 };
4109
4126