linux-kernel - [PATCH 2/2] exfat: add error check when updating dir-entries

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Date:   Tue,  9 Jun 2020 16:53:28 +0900
From:   Tetsuhiro Kohada <kohada.t2@...il.com>
To:     kohada.t2@...il.com
Cc:     kohada.tetsuhiro@...mitsubishielectric.co.jp,
        mori.takahiro@...mitsubishielectric.co.jp,
        motai.hirotaka@...mitsubishielectric.co.jp,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Namjae Jeon <namjae.jeon@...sung.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] exfat: add error check when updating dir-entries

Add error check when synchronously updating dir-entries.

Suggested-by: Namjae Jeon <linkinjeon@...nel.org>
Suggested-by: Sungjong Seo <sj1557.seo@...sung.com>
Signed-off-by: Tetsuhiro Kohada <kohada.t2@...il.com>
---
Changes in v2:
 - Split into 'write multiple sectors at once'
   and 'add error check when updating dir-entries'

 fs/exfat/dir.c      | 3 ++-
 fs/exfat/exfat_fs.h | 2 +-
 fs/exfat/file.c     | 5 ++++-
 fs/exfat/inode.c    | 8 +++++---
 4 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index 495884ccb352..3eb8386fb5f2 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -602,7 +602,7 @@ void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
 	es->modified = true;
 }
 
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 {
 	int i, err = 0;
 
@@ -614,6 +614,7 @@ void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 	for (i = 0; i < es->num_bh; i++)
 		err ? bforget(es->bh[i]):brelse(es->bh[i]);
 	kfree(es);
+	return err;
 }
 
 static int exfat_walk_fat_chain(struct super_block *sb,
diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 935954da2e54..f4fa0e833486 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -462,7 +462,7 @@ struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
 		int num);
 struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
 		struct exfat_chain *p_dir, int entry, unsigned int type);
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
 
 /* inode.c */
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index fce03f318787..37c8f04c1f8a 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -153,6 +153,7 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 		struct timespec64 ts;
 		struct exfat_dentry *ep, *ep2;
 		struct exfat_entry_set_cache *es;
+		int err;
 
 		es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 				ES_ALL_ENTRIES);
@@ -187,7 +188,9 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 		}
 
 		exfat_update_dir_chksum_with_entry_set(es);
-		exfat_free_dentry_set(es, inode_needs_sync(inode));
+		err = exfat_free_dentry_set(es, inode_needs_sync(inode));
+		if (err)
+			return err;
 	}
 
 	/* cut off from the FAT chain */
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index ef7cf7a6d187..c0bfd1a586aa 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -77,8 +77,7 @@ static int __exfat_write_inode(struct inode *inode, int sync)
 	ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
 
 	exfat_update_dir_chksum_with_entry_set(es);
-	exfat_free_dentry_set(es, sync);
-	return 0;
+	return exfat_free_dentry_set(es, sync);
 }
 
 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
@@ -222,6 +221,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 		if (ei->dir.dir != DIR_DELETED && modified) {
 			struct exfat_dentry *ep;
 			struct exfat_entry_set_cache *es;
+			int err;
 
 			es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 				ES_ALL_ENTRIES);
@@ -240,7 +240,9 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 				ep->dentry.stream.valid_size;
 
 			exfat_update_dir_chksum_with_entry_set(es);
-			exfat_free_dentry_set(es, inode_needs_sync(inode));
+			err = exfat_free_dentry_set(es, inode_needs_sync(inode));
+			if (err)
+				return err;
 
 		} /* end of if != DIR_DELETED */
 
-- 
2.25.1