[PATCH 2/2 v4] exfat: add error check when updating dir-entries

[Tetsuhiro Kohada]

Add error check when synchronously updating dir-entries.

Suggested-by: Sungjong Seo <sj1557....@samsung.com>
Signed-off-by: Tetsuhiro Kohada <kohada...@gmail.com>
---
Changes in v2:
 - Split into 'write multiple sectors at once'
   and 'add error check when updating dir-entries'
Changes in v3
 - Rebase to latest exfat-dev
Changes in v4
 - Based on 'exfat: write multiple sectors at once' v4

 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 7c2e29632634..2dc6fe695cb6 100644
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -604,7 +604,7 @@ 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;
 
@@ -617,6 +617,7 @@ void exfat_free_dentry_set(struct exfat_entry_set_cache 
*es, int sync)
                else
                        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 cbb00ee97183..da677c85314f 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -459,7 +459,7 @@ 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 cf9ca6c4d046..1e851f172e0c 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