Hi all,
With ext2 driven by ext4 module (or ext4 without journal, I haven't
tested ext2 module, but I guess the result is the same), v4.14-rc1
kernel starts to fail fstests generic/441 as:
+First fsync after reopen of fd[0] failed: Input/output error
git bisect shows that this is uncovered by commit ffb959bbdf92 ("mm:
remove optimizations based on i_size in mapping writeback waits"), which
removed (i_size == 0) check in filemap_fdatawait().
I say "uncovered" because test fails with 4.13 kernel too if we re-open
the test file without O_TRUNC flag in src/fsync-err.c (so file size is
not zero, and fails the i_size == 0 check).
The EIO was returned by sync_inode_metadata() in __generic_file_fsync(),
the call trace is like:
do_fsync
vfs_fsync_range
ext4_sync_file
__generic_file_fsync
sync_inode_metadata
writeback_single_inode
__writeback_single_inode
filemap_fdatawait => EIO here
Thanks,
Eryu
