linux-ext4 - [PATCH 2/2] ext4: allow ext4_ext

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Message-Id: <20161113223312.10531-2-tytso@mit.edu>
Date:   Sun, 13 Nov 2016 17:33:12 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     Theodore Ts'o <tytso@....edu>
Subject: [PATCH 2/2] ext4: allow ext4_ext_truncate() to return an error

Return errors to the caller instead of declaring the file system
corrupted.

Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 fs/ext4/ext4.h    |  2 +-
 fs/ext4/extents.c | 15 +++++++--------
 fs/ext4/inode.c   |  4 +++-
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index be2282dcde7d..54211c7876f8 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3128,7 +3128,7 @@ extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 			       struct ext4_map_blocks *map, int flags);
-extern void ext4_ext_truncate(handle_t *, struct inode *);
+extern int ext4_ext_truncate(handle_t *, struct inode *);
 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
 				 ext4_lblk_t end);
 extern void ext4_ext_init(struct super_block *);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c930a0110fb4..d3b119499c53 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4631,7 +4631,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 	return err ? err : allocated;
 }
 
-void ext4_ext_truncate(handle_t *handle, struct inode *inode)
+int ext4_ext_truncate(handle_t *handle, struct inode *inode)
 {
 	struct super_block *sb = inode->i_sb;
 	ext4_lblk_t last_block;
@@ -4645,7 +4645,9 @@ void ext4_ext_truncate(handle_t *handle, struct inode *inode)
 
 	/* we have to know where to truncate from in crash case */
 	EXT4_I(inode)->i_disksize = inode->i_size;
-	ext4_mark_inode_dirty(handle, inode);
+	err = ext4_mark_inode_dirty(handle, inode);
+	if (err)
+		return err;
 
 	last_block = (inode->i_size + sb->s_blocksize - 1)
 			>> EXT4_BLOCK_SIZE_BITS(sb);
@@ -4657,12 +4659,9 @@ void ext4_ext_truncate(handle_t *handle, struct inode *inode)
 		congestion_wait(BLK_RW_ASYNC, HZ/50);
 		goto retry;
 	}
-	if (err) {
-		ext4_std_error(inode->i_sb, err);
-		return;
-	}
-	err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
-	ext4_std_error(inode->i_sb, err);
+	if (err)
+		return err;
+	return ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
 }
 
 static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 40ea090d2e0e..7f32899c9701 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4167,11 +4167,13 @@ int ext4_truncate(struct inode *inode)
 	ext4_discard_preallocations(inode);
 
 	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
-		ext4_ext_truncate(handle, inode);
+		err = ext4_ext_truncate(handle, inode);
 	else
 		ext4_ind_truncate(handle, inode);
 
 	up_write(&ei->i_data_sem);
+	if (err)
+		goto out_stop;
 
 	if (IS_SYNC(inode))
 		ext4_handle_sync(handle);
-- 
2.11.0.rc0.7.gbe5a750

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