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[PATCHv2,1/5] ext4: Fix error handling in ext4_restore_inline_data()

Message ID 9f4cd7dfd54fa58ff27270881823d94ddf78dd07.1642416995.git.riteshh@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series ext4/jbd2: inline_data fixes and minor cleanups | expand

Commit Message

Ritesh Harjani Jan. 17, 2022, 12:11 p.m. UTC 
While running "./check -I 200 generic/475" it sometimes gives below
kernel BUG(). Ideally we should not call ext4_write_inline_data() if
ext4_create_inline_data() has failed.

<log snip>
[73131.453234] kernel BUG at fs/ext4/inline.c:223!

<code snip>
 212 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 213                                    void *buffer, loff_t pos, unsigned int len)
 214 {
<...>
 223         BUG_ON(!EXT4_I(inode)->i_inline_off);
 224         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);

This patch handles the error and prints out a emergency msg saying potential
data loss for the given inode (since we couldn't restore the original
inline_data due to some previous error).

[ 9571.070313] EXT4-fs (dm-0): error restoring inline_data for inode -- potential data loss! (inode 1703982, error -30)

Reported-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/inline.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
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Patch

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 39a1ab129fdc..d091133a4b46 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1133,7 +1133,15 @@  static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
 				     struct ext4_iloc *iloc,
 				     void *buf, int inline_size)
 {
-	ext4_create_inline_data(handle, inode, inline_size);
+	int ret;
+
+	ret = ext4_create_inline_data(handle, inode, inline_size);
+	if (ret) {
+		ext4_msg(inode->i_sb, KERN_EMERG,
+			"error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
+			inode->i_ino, ret);
+		return;
+	}
 	ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
 	ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 }