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Heming Zhao

2022-Apr-13 08:29 UTC

[Ocfs2-devel] [PATCH v2 5/5] ocfs2: rewrite error handling of ocfs2_fill_super

Current ocfs2_fill_super() uses one goto label "read_super_error" to
handle all error cases. And with previous serial patches, the error
handling should fork more branches to handle different error cases.
This patch rewrite the error handling of ocfs2_fill_super.

Signed-off-by: Heming Zhao <heming.zhao at suse.com>
---
 fs/ocfs2/super.c | 67 +++++++++++++++++++++++-------------------------
 1 file changed, 32 insertions(+), 35 deletions(-)

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 5e860d7162d7..72673d40d29c 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -989,28 +989,27 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 
 	if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 		status = -EINVAL;
-		goto read_super_error;
+		goto out;
 	}
 
 	/* probe for superblock */
 	status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
 	if (status < 0) {
 		mlog(ML_ERROR, "superblock probe failed!\n");
-		goto read_super_error;
+		goto out;
 	}
 
 	status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
-	osb = OCFS2_SB(sb);
-	if (status < 0) {
-		mlog_errno(status);
-		goto read_super_error;
-	}
 	brelse(bh);
 	bh = NULL;
+	if (status < 0)
+		goto out;
+
+	osb = OCFS2_SB(sb);
 
 	if (!ocfs2_check_set_options(sb, &parsed_options)) {
 		status = -EINVAL;
-		goto read_super_error;
+		goto out_super;
 	}
 	osb->s_mount_opt = parsed_options.mount_opt;
 	osb->s_atime_quantum = parsed_options.atime_quantum;
@@ -1027,7 +1026,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 
 	status = ocfs2_verify_userspace_stack(osb, &parsed_options);
 	if (status)
-		goto read_super_error;
+		goto out_super;
 
 	sb->s_magic = OCFS2_SUPER_MAGIC;
 
@@ -1041,7 +1040,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 			status = -EACCES;
 			mlog(ML_ERROR, "Readonly device detected but readonly "
 			     "mount was not specified.\n");
-			goto read_super_error;
+			goto out_super;
 		}
 
 		/* You should not be able to start a local heartbeat
@@ -1050,7 +1049,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 			status = -EROFS;
 			mlog(ML_ERROR, "Local heartbeat specified on readonly "
 			     "device.\n");
-			goto read_super_error;
+			goto out_super;
 		}
 
 		status = ocfs2_check_journals_nolocks(osb);
@@ -1059,9 +1058,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 				mlog(ML_ERROR, "Recovery required on readonly "
 				     "file system, but write access is "
 				     "unavailable.\n");
-			else
-				mlog_errno(status);
-			goto read_super_error;
+			goto out_super;
 		}
 
 		ocfs2_set_ro_flag(osb, 1);
@@ -1077,10 +1074,8 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 	}
 
 	status = ocfs2_verify_heartbeat(osb);
-	if (status < 0) {
-		mlog_errno(status);
-		goto read_super_error;
-	}
+	if (status < 0)
+		goto out_super;
 
 	osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 						 ocfs2_debugfs_root);
@@ -1094,15 +1089,14 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 
 	status = ocfs2_mount_volume(sb);
 	if (status < 0)
-		goto read_super_error;
+		goto out_debugfs;
 
 	if (osb->root_inode)
 		inode = igrab(osb->root_inode);
 
 	if (!inode) {
 		status = -EIO;
-		mlog_errno(status);
-		goto read_super_error;
+		goto out_dismount;
 	}
 
 	osb->osb_dev_kset = kset_create_and_add(sb->s_id, NULL,
@@ -1110,7 +1104,7 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 	if (!osb->osb_dev_kset) {
 		status = -ENOMEM;
 		mlog(ML_ERROR, "Unable to create device kset %s.\n", sb->s_id);
-		goto read_super_error;
+		goto out_dismount;
 	}
 
 	/* Create filecheck sysfs related directories/files at
@@ -1119,14 +1113,13 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 		status = -ENOMEM;
 		mlog(ML_ERROR, "Unable to create filecheck sysfs directory at "
 			"/sys/fs/ocfs2/%s/filecheck.\n", sb->s_id);
-		goto read_super_error;
+		goto out_dismount;
 	}
 
 	root = d_make_root(inode);
 	if (!root) {
 		status = -ENOMEM;
-		mlog_errno(status);
-		goto read_super_error;
+		goto out_dismount;
 	}
 
 	sb->s_root = root;
@@ -1178,17 +1171,21 @@ static int ocfs2_fill_super(struct super_block *sb, void
*data, int silent)
 
 	return status;
 
-read_super_error:
-	brelse(bh);
-
-	if (status)
-		mlog_errno(status);
+out_dismount:
+	atomic_set(&osb->vol_state, VOLUME_DISABLED);
+	wake_up(&osb->osb_mount_event);
+	ocfs2_dismount_volume(sb, 1);
+	goto out;
 
-	if (osb) {
-		atomic_set(&osb->vol_state, VOLUME_DISABLED);
-		wake_up(&osb->osb_mount_event);
-		ocfs2_dismount_volume(sb, 1);
-	}
+out_debugfs:
+	debugfs_remove_recursive(osb->osb_debug_root);
+out_super:
+	ocfs2_release_system_inodes(osb);
+	kfree(osb->recovery_map);
+	ocfs2_delete_osb(osb);
+	kfree(osb);
+out:
+	mlog_errno(status);
 
 	return status;
 }
-- 
2.35.1

Joseph Qi

2022-Apr-13 11:37 UTC

head link

[Ocfs2-devel] [PATCH v2 5/5] ocfs2: rewrite error handling of ocfs2_fill_super

It mostly looks good to me.
Have you done error injection test after this patchset applied?
I'm afraid ocfs2-test can't cover this as of now.

Thanks,
Joseph

On 4/13/22 4:29 PM, Heming Zhao wrote:> Current ocfs2_fill_super() uses one goto label "read_super_error"
to
> handle all error cases. And with previous serial patches, the error
> handling should fork more branches to handle different error cases.
> This patch rewrite the error handling of ocfs2_fill_super.
> 
> Signed-off-by: Heming Zhao <heming.zhao at suse.com>
> ---
>  fs/ocfs2/super.c | 67 +++++++++++++++++++++++-------------------------
>  1 file changed, 32 insertions(+), 35 deletions(-)
> 
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index 5e860d7162d7..72673d40d29c 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -989,28 +989,27 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  
>  	if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
>  		status = -EINVAL;
> -		goto read_super_error;
> +		goto out;
>  	}
>  
>  	/* probe for superblock */
>  	status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
>  	if (status < 0) {
>  		mlog(ML_ERROR, "superblock probe failed!\n");
> -		goto read_super_error;
> +		goto out;
>  	}
>  
>  	status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
> -	osb = OCFS2_SB(sb);
> -	if (status < 0) {
> -		mlog_errno(status);
> -		goto read_super_error;
> -	}
>  	brelse(bh);
>  	bh = NULL;
> +	if (status < 0)
> +		goto out;
> +
> +	osb = OCFS2_SB(sb);
>  
>  	if (!ocfs2_check_set_options(sb, &parsed_options)) {
>  		status = -EINVAL;
> -		goto read_super_error;
> +		goto out_super;
>  	}
>  	osb->s_mount_opt = parsed_options.mount_opt;
>  	osb->s_atime_quantum = parsed_options.atime_quantum;
> @@ -1027,7 +1026,7 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  
>  	status = ocfs2_verify_userspace_stack(osb, &parsed_options);
>  	if (status)
> -		goto read_super_error;
> +		goto out_super;
>  
>  	sb->s_magic = OCFS2_SUPER_MAGIC;
>  
> @@ -1041,7 +1040,7 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  			status = -EACCES;
>  			mlog(ML_ERROR, "Readonly device detected but readonly "
>  			     "mount was not specified.\n");
> -			goto read_super_error;
> +			goto out_super;
>  		}
>  
>  		/* You should not be able to start a local heartbeat
> @@ -1050,7 +1049,7 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  			status = -EROFS;
>  			mlog(ML_ERROR, "Local heartbeat specified on readonly "
>  			     "device.\n");
> -			goto read_super_error;
> +			goto out_super;
>  		}
>  
>  		status = ocfs2_check_journals_nolocks(osb);
> @@ -1059,9 +1058,7 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  				mlog(ML_ERROR, "Recovery required on readonly "
>  				     "file system, but write access is "
>  				     "unavailable.\n");
> -			else
> -				mlog_errno(status);
> -			goto read_super_error;
> +			goto out_super;
>  		}
>  
>  		ocfs2_set_ro_flag(osb, 1);
> @@ -1077,10 +1074,8 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  	}
>  
>  	status = ocfs2_verify_heartbeat(osb);
> -	if (status < 0) {
> -		mlog_errno(status);
> -		goto read_super_error;
> -	}
> +	if (status < 0)
> +		goto out_super;
>  
>  	osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
>  						 ocfs2_debugfs_root);
> @@ -1094,15 +1089,14 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  
>  	status = ocfs2_mount_volume(sb);
>  	if (status < 0)
> -		goto read_super_error;
> +		goto out_debugfs;
>  
>  	if (osb->root_inode)
>  		inode = igrab(osb->root_inode);
>  
>  	if (!inode) {
>  		status = -EIO;
> -		mlog_errno(status);
> -		goto read_super_error;
> +		goto out_dismount;
>  	}
>  
>  	osb->osb_dev_kset = kset_create_and_add(sb->s_id, NULL,
> @@ -1110,7 +1104,7 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  	if (!osb->osb_dev_kset) {
>  		status = -ENOMEM;
>  		mlog(ML_ERROR, "Unable to create device kset %s.\n",
sb->s_id);
> -		goto read_super_error;
> +		goto out_dismount;
>  	}
>  
>  	/* Create filecheck sysfs related directories/files at
> @@ -1119,14 +1113,13 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  		status = -ENOMEM;
>  		mlog(ML_ERROR, "Unable to create filecheck sysfs directory at
"
>  			"/sys/fs/ocfs2/%s/filecheck.\n", sb->s_id);
> -		goto read_super_error;
> +		goto out_dismount;
>  	}
>  
>  	root = d_make_root(inode);
>  	if (!root) {
>  		status = -ENOMEM;
> -		mlog_errno(status);
> -		goto read_super_error;
> +		goto out_dismount;
>  	}
>  
>  	sb->s_root = root;
> @@ -1178,17 +1171,21 @@ static int ocfs2_fill_super(struct super_block *sb,
void *data, int silent)
>  
>  	return status;
>  
> -read_super_error:
> -	brelse(bh);
> -
> -	if (status)
> -		mlog_errno(status);
> +out_dismount:
> +	atomic_set(&osb->vol_state, VOLUME_DISABLED);
> +	wake_up(&osb->osb_mount_event);
> +	ocfs2_dismount_volume(sb, 1);
> +	goto out;
>  
> -	if (osb) {
> -		atomic_set(&osb->vol_state, VOLUME_DISABLED);
> -		wake_up(&osb->osb_mount_event);
> -		ocfs2_dismount_volume(sb, 1);
> -	}
> +out_debugfs:
> +	debugfs_remove_recursive(osb->osb_debug_root);
> +out_super:
> +	ocfs2_release_system_inodes(osb);
> +	kfree(osb->recovery_map);
> +	ocfs2_delete_osb(osb);
> +	kfree(osb);
> +out:
> +	mlog_errno(status);
>  
>  	return status;
>  }

Ocfs2 devel - Apr 2022 - [PATCH v2 5/5] ocfs2: rewrite error handling of ocfs2_fill_super

[Ocfs2-devel] [PATCH v2 5/5] ocfs2: rewrite error handling of ocfs2_fill_super

[Ocfs2-devel] [PATCH v2 5/5] ocfs2: rewrite error handling of ocfs2_fill_super