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authorBenjamin Marzinski <bmarzins@redhat.com>2008-03-14 21:52:52 +0300
committerSteven Whitehouse <swhiteho@redhat.com>2008-03-31 13:41:44 +0400
commit58e9fee13e579df44922172dbe3c9e3ba3edf7a3 (patch)
tree7b134f28032a3cd498b2d9a18c02ea085c0725e2 /fs/gfs2/locking
parentf5a8cd020173c455705fc0095b7d299da6f8f87b (diff)
downloadlinux-58e9fee13e579df44922172dbe3c9e3ba3edf7a3.tar.xz
[GFS2] Invalidate cache at correct point
GFS2 wasn't invalidating its cache before it called into the lock manager with a request that could potentially drop a lock. This was leaving a window where the lock could be actually be held by another node, but the file's page cache would still appear valid, causing coherency problems. This patch moves the cache invalidation to before the lock manager call when dropping a lock. It also adds the option to the lock_dlm lock manager to not use conversion mode deadlock avoidance, which, on a conversion from shared to exclusive, could internally drop the lock, and then reacquire in. GFS2 now asks lock_dlm to not do this. Instead, GFS2 manually drops the lock and reacquires it. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/locking')
-rw-r--r--fs/gfs2/locking/dlm/lock.c3
-rw-r--r--fs/gfs2/locking/dlm/thread.c10
2 files changed, 11 insertions, 2 deletions
diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c
index 542a797ac89a..53a6ab3c0919 100644
--- a/fs/gfs2/locking/dlm/lock.c
+++ b/fs/gfs2/locking/dlm/lock.c
@@ -137,7 +137,8 @@ static inline unsigned int make_flags(struct gdlm_lock *lp,
/* Conversion deadlock avoidance by DLM */
- if (!test_bit(LFL_FORCE_PROMOTE, &lp->flags) &&
+ if (!(lp->ls->fsflags & LM_MFLAG_CONV_NODROP) &&
+ !test_bit(LFL_FORCE_PROMOTE, &lp->flags) &&
!(lkf & DLM_LKF_NOQUEUE) &&
cur > DLM_LOCK_NL && req > DLM_LOCK_NL && cur != req)
lkf |= DLM_LKF_CONVDEADLK;
diff --git a/fs/gfs2/locking/dlm/thread.c b/fs/gfs2/locking/dlm/thread.c
index 521694fc19d6..e53db6fd28ab 100644
--- a/fs/gfs2/locking/dlm/thread.c
+++ b/fs/gfs2/locking/dlm/thread.c
@@ -135,7 +135,15 @@ static void process_complete(struct gdlm_lock *lp)
lp->lksb.sb_status, lp->lockname.ln_type,
(unsigned long long)lp->lockname.ln_number,
lp->flags);
- return;
+ if (lp->lksb.sb_status == -EDEADLOCK &&
+ lp->ls->fsflags & LM_MFLAG_CONV_NODROP) {
+ lp->req = lp->cur;
+ acb.lc_ret |= LM_OUT_CONV_DEADLK;
+ if (lp->cur == DLM_LOCK_IV)
+ lp->lksb.sb_lkid = 0;
+ goto out;
+ } else
+ return;
}
/*