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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-04-28 21:04:59 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-05-09 13:36:57 +0900
commit201913ed746c7724a40d33ee5a0b6a1fd2ef3193 (patch)
tree149cd7552a854055a2ed278234649a77914aaf96 /fs/nilfs2/page.c
parent85c2a74fabadfc561b75fbd7decc6bcbfe873d57 (diff)
downloadlinux-201913ed746c7724a40d33ee5a0b6a1fd2ef3193.tar.gz
nilfs2: fix circular locking dependency of writer mutex
This fixes the following circular locking dependency problem: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.30-rc3 #5 ------------------------------------------------------- segctord/3895 is trying to acquire lock: (&nilfs->ns_writer_mutex){+.+...}, at: [<d0d02172>] nilfs_mdt_get_block+0x89/0x20f [nilfs2] but task is already holding lock: (&bmap->b_sem){++++..}, at: [<d0d02d99>] nilfs_bmap_propagate+0x14/0x2e [nilfs2] which lock already depends on the new lock. The bugfix is done by replacing call sites of nilfs_get_writer() which are never called from read-only context with direct dereferencing of pointer to a writable FS-instance. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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