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authorSteven Whitehouse <swhiteho@redhat.com>2013-10-15 18:18:08 +0400
committerSteven Whitehouse <swhiteho@redhat.com>2013-10-15 18:18:08 +0400
commite66cf161098a634dc96e32d0089c5767cf25668a (patch)
tree36b99a83164748b67f14b711f3e4812c22f54484 /fs/gfs2/glock.h
parente46c772dbafc2059b0c7ee87c6a7232baadaf6c7 (diff)
downloadlinux-e66cf161098a634dc96e32d0089c5767cf25668a.tar.xz
GFS2: Use lockref for glocks
Currently glocks have an atomic reference count and also a spinlock which covers various internal fields, such as the state. This intent of this patch is to replace the spinlock and the atomic reference count with a lockref structure. This contains a spinlock which we can continue to use as before, and a reference counter which is used in conjuction with the spinlock to replace the previous atomic counter. As a result of this there are some new rules for reference counting on glocks. We need to distinguish between reference count changes under gl_spin (which are now just increment or decrement of the new counter, provided the count cannot hit zero) and those which are outside of gl_spin, but which now take gl_spin internally. The conversion is relatively straight forward. There is probably some further clean up which can be done, but the priority at this stage is to make the change in as simple a manner as possible. A consequence of this change is that the reference count is being decoupled from the lru list processing. This should allow future adoption of the lru_list code with glocks in due course. The reason for using the "dead" state and not just relying on 0 being the "invalid state" is so that in due course 0 ref counts can be allowable. The intent is to eventually be able to remove the ref count changes which are currently hidden away in state_change(). Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.h')
-rw-r--r--fs/gfs2/glock.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 69f66e3d22bf..6647d77366ba 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -181,8 +181,6 @@ static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl)
extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
const struct gfs2_glock_operations *glops,
int create, struct gfs2_glock **glp);
-extern void gfs2_glock_hold(struct gfs2_glock *gl);
-extern void gfs2_glock_put_nolock(struct gfs2_glock *gl);
extern void gfs2_glock_put(struct gfs2_glock *gl);
extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
unsigned flags, struct gfs2_holder *gh);