diff options
author | David Teigland <teigland@redhat.com> | 2007-09-28 00:53:38 +0400 |
---|---|---|
committer | Steven Whitehouse <swhiteho@redhat.com> | 2007-10-10 11:56:38 +0400 |
commit | c36258b5925e6cf6bf72904635100593573bfcff (patch) | |
tree | 565f1ce29a7f8a2cd1c25f2d36c932727adbdbc2 /fs/dlm/lock.h | |
parent | b434eda6fda5bcdcc2dd918e5ffbf7184f2d4e17 (diff) | |
download | linux-c36258b5925e6cf6bf72904635100593573bfcff.tar.xz |
[DLM] block dlm_recv in recovery transition
Introduce a per-lockspace rwsem that's held in read mode by dlm_recv
threads while working in the dlm. This allows dlm_recv activity to be
suspended when the lockspace transitions to, from and between recovery
cycles.
The specific bug prompting this change is one where an in-progress
recovery cycle is aborted by a new recovery cycle. While dlm_recv was
processing a recovery message, the recovery cycle was aborted and
dlm_recoverd began cleaning up. dlm_recv decremented recover_locks_count
on an rsb after dlm_recoverd had reset it to zero. This is fixed by
suspending dlm_recv (taking write lock on the rwsem) before aborting the
current recovery.
The transitions to/from normal and recovery modes are simplified by using
this new ability to block dlm_recv. The switch from normal to recovery
mode means dlm_recv goes from processing locking messages, to saving them
for later, and vice versa. Races are avoided by blocking dlm_recv when
setting the flag that switches between modes.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/dlm/lock.h')
-rw-r--r-- | fs/dlm/lock.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h index 1720313c22df..ada04680a1e5 100644 --- a/fs/dlm/lock.h +++ b/fs/dlm/lock.h @@ -16,7 +16,8 @@ void dlm_print_rsb(struct dlm_rsb *r); void dlm_dump_rsb(struct dlm_rsb *r); void dlm_print_lkb(struct dlm_lkb *lkb); -int dlm_receive_message(struct dlm_header *hd, int nodeid, int recovery); +void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms); +void dlm_receive_buffer(struct dlm_header *hd, int nodeid); int dlm_modes_compat(int mode1, int mode2); int dlm_find_rsb(struct dlm_ls *ls, char *name, int namelen, unsigned int flags, struct dlm_rsb **r_ret); |