tree 3632c63eef9e159947316f18d48054f082c0578e
parent 001e8e8df4283dd4ef7a0297c012fce364c05cf1
author Bob Peterson <rpeterso@redhat.com> 1300393198 -0400
committer Steven Whitehouse <swhiteho@redhat.com> 1303136630 +0100

GFS2: filesystem hang caused by incorrect lock order

This patch fixes a deadlock in GFS2 where two processes are trying
to reclaim an unlinked dinode:
One holds the inode glock and calls gfs2_lookup_by_inum trying to look
up the inode, which it can't, due to I_FREEING.  The other has set
I_FREEING from vfs and is at the beginning of gfs2_delete_inode
waiting for the glock, which is held by the first.  The solution is to
add a new non_block parameter to the gfs2_iget function that causes it
to return -ENOENT if the inode is being freed.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>