tree 220268d2087adac3191a54805dd6c0c203d50606
parent fafc9929c668f8bae6dd1f109f33a86d2cb3c460
author Jan Kara <jack@suse.cz> 1303422436 +0200
committer Jan Kara <jack@suse.cz> 1304112003 +0200

ext3: Fix lock inversion in ext3_symlink()

ext3_symlink() cannot call __page_symlink() with transaction open.
__page_symlink() calls ext3_write_begin() which gets page lock which ranks
above transaction start (thus lock ordering is violated) and and also
ext3_write_begin() waits for a transaction commit when we run out of space
which never happens if we hold transaction open.

Fix the problem by stopping a transaction before calling __page_symlink()
(we have to be careful and put inode to orphan list so that it gets deleted
in case of crash) and starting another one after __page_symlink() returns
for addition of symlink into a directory.

Signed-off-by: Jan Kara <jack@suse.cz>