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author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-05-16 12:12:08 -0400 |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-09-14 01:18:24 -0400 |
commit | c72e05756b900b3be24cd73a16de52bab80984c0 (patch) | |
tree | 4fc35ad9efc1a6a9ca14baa3612e551fb4da793e /include/linux/reiserfs_fs_sb.h | |
parent | 2ac626955ed62ee8596f00581f959cc86e6198d1 (diff) |
kill-the-bkl/reiserfs: acquire the inode mutex safely
While searching a pathname, an inode mutex can be acquired
in do_lookup() which calls reiserfs_lookup() which in turn
acquires the write lock.
On the other side reiserfs_fill_super() can acquire the write_lock
and then call reiserfs_lookup_privroot() which can acquire an
inode mutex (the root of the mount point).
So we theoretically risk an AB - BA lock inversion that could lead
to a deadlock.
As for other lock dependencies found since the bkl to mutex
conversion, the fix is to use reiserfs_mutex_lock_safe() which
drops the lock dependency to the write lock.
[ Impact: fix a possible deadlock with reiserfs ]
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'include/linux/reiserfs_fs_sb.h')
0 files changed, 0 insertions, 0 deletions