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2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077 
 kernel/fs/nilfs2/super.c
....@@ -53,6 +53,7 @@
5353 MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
5454 		   "(NILFS)");
5555 MODULE_LICENSE("GPL");
56
+MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
5657 
5758 static struct kmem_cache *nilfs_inode_cachep;
5859 struct kmem_cache *nilfs_transaction_cachep;
....@@ -62,19 +63,25 @@
6263 static int nilfs_setup_super(struct super_block *sb, int is_mount);
6364 static int nilfs_remount(struct super_block *sb, int *flags, char *data);
6465 
65
-void __nilfs_msg(struct super_block *sb, const char *level, const char *fmt,
66
-		 ...)
66
+void __nilfs_msg(struct super_block *sb, const char *fmt, ...)
6767 {
6868 	struct va_format vaf;
6969 	va_list args;
70
+	int level;
7071 
7172 	va_start(args, fmt);
72
-	vaf.fmt = fmt;
73
+
74
+	level = printk_get_level(fmt);
75
+	vaf.fmt = printk_skip_level(fmt);
7376 	vaf.va = &args;
77
+
7478 	if (sb)
75
-		printk("%sNILFS (%s): %pV\n", level, sb->s_id, &vaf);
79
+		printk("%c%cNILFS (%s): %pV\n",
80
+		       KERN_SOH_ASCII, level, sb->s_id, &vaf);
7681 	else
77
-		printk("%sNILFS: %pV\n", level, &vaf);
82
+		printk("%c%cNILFS: %pV\n",
83
+		       KERN_SOH_ASCII, level, &vaf);
84
+
7885 	va_end(args);
7986 }
8087 
....@@ -106,7 +113,7 @@
106113  *
107114  * This implements the body of nilfs_error() macro.  Normally,
108115  * nilfs_error() should be used.  As for sustainable errors such as a
109
- * single-shot I/O error, nilfs_msg() should be used instead.
116
+ * single-shot I/O error, nilfs_err() should be used instead.
110117  *
111118  * Callers should not add a trailing newline since this will do it.
112119  */
....@@ -151,23 +158,17 @@
151158 	ii->i_bh = NULL;
152159 	ii->i_state = 0;
153160 	ii->i_cno = 0;
154
-	nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode);
161
+	ii->i_assoc_inode = NULL;
162
+	ii->i_bmap = &ii->i_bmap_data;
155163 	return &ii->vfs_inode;
156164 }
157165 
158
-static void nilfs_i_callback(struct rcu_head *head)
166
+static void nilfs_free_inode(struct inode *inode)
159167 {
160
-	struct inode *inode = container_of(head, struct inode, i_rcu);
161
-
162168 	if (nilfs_is_metadata_file_inode(inode))
163169 		nilfs_mdt_destroy(inode);
164170 
165171 	kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
166
-}
167
-
168
-void nilfs_destroy_inode(struct inode *inode)
169
-{
170
-	call_rcu(&inode->i_rcu, nilfs_i_callback);
171172 }
172173 
173174 static int nilfs_sync_super(struct super_block *sb, int flag)
....@@ -185,8 +186,7 @@
185186 	}
186187 
187188 	if (unlikely(err)) {
188
-		nilfs_msg(sb, KERN_ERR, "unable to write superblock: err=%d",
189
-			  err);
189
+		nilfs_err(sb, "unable to write superblock: err=%d", err);
190190 		if (err == -EIO && nilfs->ns_sbh[1]) {
191191 			/*
192192 			 * sbp[0] points to newer log than sbp[1],
....@@ -256,7 +256,7 @@
256256 		    sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
257257 			memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
258258 		} else {
259
-			nilfs_msg(sb, KERN_CRIT, "superblock broke");
259
+			nilfs_crit(sb, "superblock broke");
260260 			return NULL;
261261 		}
262262 	} else if (sbp[1] &&
....@@ -366,17 +366,38 @@
366366 	offset = sb2off & (nilfs->ns_blocksize - 1);
367367 	nsbh = sb_getblk(sb, newblocknr);
368368 	if (!nsbh) {
369
-		nilfs_msg(sb, KERN_WARNING,
370
-			  "unable to move secondary superblock to block %llu",
371
-			  (unsigned long long)newblocknr);
369
+		nilfs_warn(sb,
370
+			   "unable to move secondary superblock to block %llu",
371
+			   (unsigned long long)newblocknr);
372372 		ret = -EIO;
373373 		goto out;
374374 	}
375375 	nsbp = (void *)nsbh->b_data + offset;
376
-	memset(nsbp, 0, nilfs->ns_blocksize);
376
+
377
+	lock_buffer(nsbh);
378
+	if (sb2i >= 0) {
379
+		/*
380
+		 * The position of the second superblock only changes by 4KiB,
381
+		 * which is larger than the maximum superblock data size
382
+		 * (= 1KiB), so there is no need to use memmove() to allow
383
+		 * overlap between source and destination.
384
+		 */
385
+		memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
386
+
387
+		/*
388
+		 * Zero fill after copy to avoid overwriting in case of move
389
+		 * within the same block.
390
+		 */
391
+		memset(nsbh->b_data, 0, offset);
392
+		memset((void *)nsbp + nilfs->ns_sbsize, 0,
393
+		       nsbh->b_size - offset - nilfs->ns_sbsize);
394
+	} else {
395
+		memset(nsbh->b_data, 0, nsbh->b_size);
396
+	}
397
+	set_buffer_uptodate(nsbh);
398
+	unlock_buffer(nsbh);
377399 
378400 	if (sb2i >= 0) {
379
-		memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
380401 		brelse(nilfs->ns_sbh[sb2i]);
381402 		nilfs->ns_sbh[sb2i] = nsbh;
382403 		nilfs->ns_sbp[sb2i] = nsbp;
....@@ -408,6 +429,15 @@
408429 	devsize = i_size_read(sb->s_bdev->bd_inode);
409430 	if (newsize > devsize)
410431 		goto out;
432
+
433
+	/*
434
+	 * Prevent underflow in second superblock position calculation.
435
+	 * The exact minimum size check is done in nilfs_sufile_resize().
436
+	 */
437
+	if (newsize < 4096) {
438
+		ret = -ENOSPC;
439
+		goto out;
440
+	}
411441 
412442 	/*
413443 	 * Write lock is required to protect some functions depending
....@@ -474,6 +504,7 @@
474504 		up_write(&nilfs->ns_sem);
475505 	}
476506 
507
+	nilfs_sysfs_delete_device_group(nilfs);
477508 	iput(nilfs->ns_sufile);
478509 	iput(nilfs->ns_cpfile);
479510 	iput(nilfs->ns_dat);
....@@ -531,7 +562,7 @@
531562 	up_read(&nilfs->ns_segctor_sem);
532563 	if (unlikely(err)) {
533564 		if (err == -ENOENT || err == -EINVAL) {
534
-			nilfs_msg(sb, KERN_ERR,
565
+			nilfs_err(sb,
535566 				  "Invalid checkpoint (checkpoint number=%llu)",
536567 				  (unsigned long long)cno);
537568 			err = -EINVAL;
....@@ -629,8 +660,7 @@
629660 	err = nilfs_ifile_count_free_inodes(root->ifile,
630661 					    &nmaxinodes, &nfreeinodes);
631662 	if (unlikely(err)) {
632
-		nilfs_msg(sb, KERN_WARNING,
633
-			  "failed to count free inodes: err=%d", err);
663
+		nilfs_warn(sb, "failed to count free inodes: err=%d", err);
634664 		if (err == -ERANGE) {
635665 			/*
636666 			 * If nilfs_palloc_count_max_entries() returns
....@@ -654,8 +684,7 @@
654684 	buf->f_files = nmaxinodes;
655685 	buf->f_ffree = nfreeinodes;
656686 	buf->f_namelen = NILFS_NAME_LEN;
657
-	buf->f_fsid.val[0] = (u32)id;
658
-	buf->f_fsid.val[1] = (u32)(id >> 32);
687
+	buf->f_fsid = u64_to_fsid(id);
659688 
660689 	return 0;
661690 }
....@@ -686,7 +715,7 @@
686715 
687716 static const struct super_operations nilfs_sops = {
688717 	.alloc_inode    = nilfs_alloc_inode,
689
-	.destroy_inode  = nilfs_destroy_inode,
718
+	.free_inode     = nilfs_free_inode,
690719 	.dirty_inode    = nilfs_dirty_inode,
691720 	.evict_inode    = nilfs_evict_inode,
692721 	.put_super      = nilfs_put_super,
....@@ -762,7 +791,7 @@
762791 			break;
763792 		case Opt_snapshot:
764793 			if (is_remount) {
765
-				nilfs_msg(sb, KERN_ERR,
794
+				nilfs_err(sb,
766795 					  "\"%s\" option is invalid for remount",
767796 					  p);
768797 				return 0;
....@@ -778,8 +807,7 @@
778807 			nilfs_clear_opt(nilfs, DISCARD);
779808 			break;
780809 		default:
781
-			nilfs_msg(sb, KERN_ERR,
782
-				  "unrecognized mount option \"%s\"", p);
810
+			nilfs_err(sb, "unrecognized mount option \"%s\"", p);
783811 			return 0;
784812 		}
785813 	}
....@@ -815,10 +843,10 @@
815843 	mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
816844 
817845 	if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
818
-		nilfs_msg(sb, KERN_WARNING, "mounting fs with errors");
846
+		nilfs_warn(sb, "mounting fs with errors");
819847 #if 0
820848 	} else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
821
-		nilfs_msg(sb, KERN_WARNING, "maximal mount count reached");
849
+		nilfs_warn(sb, "maximal mount count reached");
822850 #endif
823851 	}
824852 	if (!max_mnt_count)
....@@ -881,7 +909,7 @@
881909 	features = le64_to_cpu(sbp->s_feature_incompat) &
882910 		~NILFS_FEATURE_INCOMPAT_SUPP;
883911 	if (features) {
884
-		nilfs_msg(sb, KERN_ERR,
912
+		nilfs_err(sb,
885913 			  "couldn't mount because of unsupported optional features (%llx)",
886914 			  (unsigned long long)features);
887915 		return -EINVAL;
....@@ -889,7 +917,7 @@
889917 	features = le64_to_cpu(sbp->s_feature_compat_ro) &
890918 		~NILFS_FEATURE_COMPAT_RO_SUPP;
891919 	if (!sb_rdonly(sb) && features) {
892
-		nilfs_msg(sb, KERN_ERR,
920
+		nilfs_err(sb,
893921 			  "couldn't mount RDWR because of unsupported optional features (%llx)",
894922 			  (unsigned long long)features);
895923 		return -EINVAL;
....@@ -908,12 +936,12 @@
908936 	inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
909937 	if (IS_ERR(inode)) {
910938 		ret = PTR_ERR(inode);
911
-		nilfs_msg(sb, KERN_ERR, "error %d getting root inode", ret);
939
+		nilfs_err(sb, "error %d getting root inode", ret);
912940 		goto out;
913941 	}
914942 	if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
915943 		iput(inode);
916
-		nilfs_msg(sb, KERN_ERR, "corrupt root inode");
944
+		nilfs_err(sb, "corrupt root inode");
917945 		ret = -EINVAL;
918946 		goto out;
919947 	}
....@@ -941,7 +969,7 @@
941969 	return ret;
942970 
943971  failed_dentry:
944
-	nilfs_msg(sb, KERN_ERR, "error %d getting root dentry", ret);
972
+	nilfs_err(sb, "error %d getting root dentry", ret);
945973 	goto out;
946974 }
947975 
....@@ -961,7 +989,7 @@
961989 		ret = (ret == -ENOENT) ? -EINVAL : ret;
962990 		goto out;
963991 	} else if (!ret) {
964
-		nilfs_msg(s, KERN_ERR,
992
+		nilfs_err(s,
965993 			  "The specified checkpoint is not a snapshot (checkpoint number=%llu)",
966994 			  (unsigned long long)cno);
967995 		ret = -EINVAL;
....@@ -970,7 +998,7 @@
970998 
971999 	ret = nilfs_attach_checkpoint(s, cno, false, &root);
9721000 	if (ret) {
973
-		nilfs_msg(s, KERN_ERR,
1001
+		nilfs_err(s,
9741002 			  "error %d while loading snapshot (checkpoint number=%llu)",
9751003 			  ret, (unsigned long long)cno);
9761004 		goto out;
....@@ -1067,7 +1095,7 @@
10671095 	cno = nilfs_last_cno(nilfs);
10681096 	err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
10691097 	if (err) {
1070
-		nilfs_msg(sb, KERN_ERR,
1098
+		nilfs_err(sb,
10711099 			  "error %d while loading last checkpoint (checkpoint number=%llu)",
10721100 			  err, (unsigned long long)cno);
10731101 		goto failed_unload;
....@@ -1100,6 +1128,7 @@
11001128 	nilfs_put_root(fsroot);
11011129 
11021130  failed_unload:
1131
+	nilfs_sysfs_delete_device_group(nilfs);
11031132 	iput(nilfs->ns_sufile);
11041133 	iput(nilfs->ns_cpfile);
11051134 	iput(nilfs->ns_dat);
....@@ -1129,16 +1158,14 @@
11291158 	err = -EINVAL;
11301159 
11311160 	if (!nilfs_valid_fs(nilfs)) {
1132
-		nilfs_msg(sb, KERN_WARNING,
1133
-			  "couldn't remount because the filesystem is in an incomplete recovery state");
1161
+		nilfs_warn(sb,
1162
+			   "couldn't remount because the filesystem is in an incomplete recovery state");
11341163 		goto restore_opts;
11351164 	}
11361165 
11371166 	if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
11381167 		goto out;
11391168 	if (*flags & SB_RDONLY) {
1140
-		/* Shutting down log writer */
1141
-		nilfs_detach_log_writer(sb);
11421169 		sb->s_flags |= SB_RDONLY;
11431170 
11441171 		/*
....@@ -1162,9 +1189,9 @@
11621189 			~NILFS_FEATURE_COMPAT_RO_SUPP;
11631190 		up_read(&nilfs->ns_sem);
11641191 		if (features) {
1165
-			nilfs_msg(sb, KERN_WARNING,
1166
-				  "couldn't remount RDWR because of unsupported optional features (%llx)",
1167
-				  (unsigned long long)features);
1192
+			nilfs_warn(sb,
1193
+				   "couldn't remount RDWR because of unsupported optional features (%llx)",
1194
+				   (unsigned long long)features);
11681195 			err = -EROFS;
11691196 			goto restore_opts;
11701197 		}
....@@ -1223,7 +1250,7 @@
12231250 	return 0;
12241251 
12251252 parse_error:
1226
-	nilfs_msg(NULL, KERN_ERR, "invalid option \"%s\": %s", option, msg);
1253
+	nilfs_err(NULL, "invalid option \"%s\": %s", option, msg);
12271254 	return 1;
12281255 }
12291256 
....@@ -1326,7 +1353,7 @@
13261353 	} else if (!sd.cno) {
13271354 		if (nilfs_tree_is_busy(s->s_root)) {
13281355 			if ((flags ^ s->s_flags) & SB_RDONLY) {
1329
-				nilfs_msg(s, KERN_ERR,
1356
+				nilfs_err(s,
13301357 					  "the device already has a %s mount.",
13311358 					  sb_rdonly(s) ? "read-only" : "read/write");
13321359 				err = -EBUSY;
....@@ -1382,8 +1409,6 @@
13821409 #ifdef CONFIG_NILFS_XATTR
13831410 	init_rwsem(&ii->xattr_sem);
13841411 #endif
1385
-	address_space_init_once(&ii->i_btnode_cache);
1386
-	ii->i_bmap = &ii->i_bmap_data;
13871412 	inode_init_once(&ii->vfs_inode);
13881413 }
13891414