From: Ritesh Harjani riteshh@linux.ibm.com
stable inclusion from linux-4.19.228 commit e9368c941a26098a199ee357f0370d49ac30b47f
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commit 897026aaa73eb2517dfea8d147f20ddb0b813044 upstream.
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 Link: https://lore.kernel.org/r/9f4cd7dfd54fa58ff27270881823d94ddf78dd07.164241699... Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- fs/ext4/inline.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index f36936bcd260..abb71ba0b1e6 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -1126,7 +1126,15 @@ 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); }