ext4: check return value of blkdev_issue_flush()
blkdev_issue_flush() can fail; make sure the error gets properly
propagated.
This is a port of the equivalent ext3 patch from commit 44f4f729e7a1.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 2a1dcea..323eb15 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -203,7 +203,7 @@
struct inode *inode = file->f_mapping->host;
struct ext4_inode_info *ei = EXT4_I(inode);
journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
- int ret;
+ int ret, err;
tid_t commit_tid;
bool needs_barrier = false;
@@ -255,8 +255,11 @@
needs_barrier = true;
jbd2_log_start_commit(journal, commit_tid);
ret = jbd2_log_wait_commit(journal, commit_tid);
- if (needs_barrier)
- blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+ if (needs_barrier) {
+ err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+ if (!ret)
+ ret = err;
+ }
out:
mutex_unlock(&inode->i_mutex);
trace_ext4_sync_file_exit(inode, ret);