[PATCH 1/2] aio: make kiocb->private NUll in init_sync_kiocb()

The unaligned io flag is set in the kiocb when an unaligned
dio is issued, it should be cleared even when the dio fails,
or it may affect the following io which are using the same
kiocb.

Signed-off-by: Junxiao Bi

fs/ocfs2/file.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 061591a..98513c8 100644
a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2422,8 +2422,10 @@ out_dio:
unaligned_dio = 0;
}

- if (unaligned_dio)
+ if (unaligned_dio) {
+ ocfs2_iocb_clear_unaligned_aio(iocb);
atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio);
+ }

out:
if (rw_level != -1)

Ocfs2 uses kiocb.*private as a flag of unsigned long size. In
commit a11f7e6 ocfs2: serialize unaligned aio, the unaligned
io flag is involved in it to serialize the unaligned aio. As
*private is not initialized in init_sync_kiocb() of do_sync_write(),
this unaligned io flag may be unexpectly set in an aligned dio.
And this will cause OCFS2_I(inode)->ip_unaligned_aio decreased
to -1 in ocfs2_dio_end_io(), thus the following unaligned dio
will hang forever at ocfs2_aiodio_wait() in ocfs2_file_write_iter().

We can't initialized this flag in ocfs2_file_write_iter() since
it may be invoked several times by do_sync_write(). So we initialize
it in init_sync_kiocb(), it's also useful for other similiar use of
it in the future.

Signed-off-by: Junxiao Bi

include/linux/aio.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/include/linux/aio.h b/include/linux/aio.h
index 2314ad8..b1a520e 100644
a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -140,6 +140,7 @@ struct kiocb {
(x)->ki_dtor = NULL; \
(x)->ki_obj.tsk = tsk; \
(x)->ki_user_data = 0; \
+ (x)->private = NULL; \
} while (0)

#define AIO_RING_MAGIC 0xa10a10a1

The unaligned io flag is set in the kiocb when an unaligned
dio is issued, it should be cleared even when the dio fails,
or it may affect the following io which are using the same
kiocb.

Ocfs2 uses kiocb.*private as a flag of unsigned long size. In
commit a11f7e6 ocfs2: serialize unaligned aio, the unaligned
io flag is involved in it to serialize the unaligned aio. As
*private is not initialized in init_sync_kiocb() of do_sync_write(),
this unaligned io flag may be unexpectly set in an aligned dio.
And this will cause OCFS2_I(inode)->ip_unaligned_aio decreased
to -1 in ocfs2_dio_end_io(), thus the following unaligned dio
will hang forever at ocfs2_aiodio_wait() in ocfs2_file_write_iter().

We can't initialized this flag in ocfs2_file_write_iter() since
it may be invoked several times by do_sync_write(). So we initialize
it in init_sync_kiocb(), it's also useful for other similiar use of
it in the future.

Junxiao Bi writes:

The unaligned io flag is set in the kiocb when an unaligned
dio is issued, it should be cleared even when the dio fails,
or it may affect the following io which are using the same
kiocb.

What code is re-using kiocbs, much less re-using them without
re-initializing them?

-Jeff