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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 03:34:42 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 03:34:42 +0100
commitb6da0076bab5a12afb19312ffee41c95490af2a0 (patch)
tree52a5675b9c2ff95d88b981d5b9a3822f6073c112 /fs/ocfs2/dlmglue.c
parentMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vir... (diff)
parentexit: pidns: fix/update the comments in zap_pid_ns_processes() (diff)
downloadlinux-b6da0076bab5a12afb19312ffee41c95490af2a0.tar.xz
linux-b6da0076bab5a12afb19312ffee41c95490af2a0.zip
Merge branch 'akpm' (patchbomb from Andrew)
Merge first patchbomb from Andrew Morton: - a few minor cifs fixes - dma-debug upadtes - ocfs2 - slab - about half of MM - procfs - kernel/exit.c - panic.c tweaks - printk upates - lib/ updates - checkpatch updates - fs/binfmt updates - the drivers/rtc tree - nilfs - kmod fixes - more kernel/exit.c - various other misc tweaks and fixes * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (190 commits) exit: pidns: fix/update the comments in zap_pid_ns_processes() exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting exit: exit_notify: re-use "dead" list to autoreap current exit: reparent: call forget_original_parent() under tasklist_lock exit: reparent: avoid find_new_reaper() if no children exit: reparent: introduce find_alive_thread() exit: reparent: introduce find_child_reaper() exit: reparent: document the ->has_child_subreaper checks exit: reparent: s/while_each_thread/for_each_thread/ in find_new_reaper() exit: reparent: fix the cross-namespace PR_SET_CHILD_SUBREAPER reparenting exit: reparent: fix the dead-parent PR_SET_CHILD_SUBREAPER reparenting exit: proc: don't try to flush /proc/tgid/task/tgid exit: release_task: fix the comment about group leader accounting exit: wait: drop tasklist_lock before psig->c* accounting exit: wait: don't use zombie->real_parent exit: wait: cleanup the ptrace_reparented() checks usermodehelper: kill the kmod_thread_locker logic usermodehelper: don't use CLONE_VFORK for ____call_usermodehelper() fs/hfs/catalog.c: fix comparison bug in hfs_cat_keycmp nilfs2: fix the nilfs_iget() vs. nilfs_new_inode() races ...
Diffstat (limited to 'fs/ocfs2/dlmglue.c')
-rw-r--r--fs/ocfs2/dlmglue.c37
1 files changed, 31 insertions, 6 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 37297c14f9a3..1c423af04c69 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -861,8 +861,13 @@ static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lo
* We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing
* the OCFS2_LOCK_BUSY flag to prevent the dc thread from
* downconverting the lock before the upconvert has fully completed.
+ * Do not prevent the dc thread from downconverting if NONBLOCK lock
+ * had already returned.
*/
- lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
+ if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED))
+ lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING);
+ else
+ lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED);
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
}
@@ -1324,13 +1329,12 @@ static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
/* returns 0 if the mw that was removed was already satisfied, -EBUSY
* if the mask still hadn't reached its goal */
-static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
+static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
struct ocfs2_mask_waiter *mw)
{
- unsigned long flags;
int ret = 0;
- spin_lock_irqsave(&lockres->l_lock, flags);
+ assert_spin_locked(&lockres->l_lock);
if (!list_empty(&mw->mw_item)) {
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
ret = -EBUSY;
@@ -1338,6 +1342,18 @@ static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
list_del_init(&mw->mw_item);
init_completion(&mw->mw_complete);
}
+
+ return ret;
+}
+
+static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
+ struct ocfs2_mask_waiter *mw)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ ret = __lockres_remove_mask_waiter(lockres, mw);
spin_unlock_irqrestore(&lockres->l_lock, flags);
return ret;
@@ -1373,6 +1389,7 @@ static int __ocfs2_cluster_lock(struct ocfs2_super *osb,
unsigned long flags;
unsigned int gen;
int noqueue_attempted = 0;
+ int dlm_locked = 0;
ocfs2_init_mask_waiter(&mw);
@@ -1481,6 +1498,7 @@ again:
ocfs2_recover_from_dlm_error(lockres, 1);
goto out;
}
+ dlm_locked = 1;
mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n",
lockres->l_name);
@@ -1514,10 +1532,17 @@ out:
if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
wait = 0;
- if (lockres_remove_mask_waiter(lockres, &mw))
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ if (__lockres_remove_mask_waiter(lockres, &mw)) {
+ if (dlm_locked)
+ lockres_or_flags(lockres,
+ OCFS2_LOCK_NONBLOCK_FINISHED);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
ret = -EAGAIN;
- else
+ } else {
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
goto again;
+ }
}
if (wait) {
ret = ocfs2_wait_for_mask(&mw);