tree f129ccf336689296ff21e34ed86712b25d437a65
parent 3613d22807a2616e9346800bacd88aa8bbbefcd7
author Jan Kara <jack@suse.cz> 1370366471 -0400
committer Theodore Ts'o <tytso@mit.edu> 1370366471 -0400

ext4: use transaction reservation for extent conversion in ext4_end_io

Later we would like to clear PageWriteback bit only after extent
conversion from unwritten to written extents is performed.  However it
is not possible to start a transaction after PageWriteback is set
because that violates lock ordering (and is easy to deadlock).  So we
have to reserve a transaction before locking pages and sending them
for IO and later we use the transaction for extent conversion from
ext4_end_io().

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>