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authorSteven Whitehouse <swhiteho@redhat.com>2013-04-10 10:26:55 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2013-04-10 10:26:55 +0100
commit81ffbf654f0cfeeb44e69832b3d301958a4108d8 (patch)
tree7c9c2d1c91dc2f696ea7cd0db25a28987195fcf6 /fs
parent16ca9412d8018188bddda29c3fee88471b94e3cb (diff)
downloadlinux-81ffbf654f0cfeeb44e69832b3d301958a4108d8.tar.bz2
GFS2: Add origin indicator to glock callbacks
This patch adds a bool indicating whether the demote request was originated locally or remotely. This is then used by the iopen ->go_callback() to make 100% sure that it will only respond to remote callbacks. Since ->evict_inode() uses GL_NOCACHE when it attempts to get an exclusive lock on the iopen lock, this may result in extra scheduling of the workqueue in case that the exclusive promotion request failed. This patch prevents that from happening. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/gfs2/glock.c12
-rw-r--r--fs/gfs2/glops.c4
-rw-r--r--fs/gfs2/incore.h2
3 files changed, 9 insertions, 9 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 6e30fd17c55a..77d7927bcd75 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -912,7 +912,7 @@ int gfs2_glock_wait(struct gfs2_holder *gh)
*/
static void handle_callback(struct gfs2_glock *gl, unsigned int state,
- unsigned long delay)
+ unsigned long delay, bool remote)
{
int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE;
@@ -925,7 +925,7 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state,
gl->gl_demote_state = LM_ST_UNLOCKED;
}
if (gl->gl_ops->go_callback)
- gl->gl_ops->go_callback(gl);
+ gl->gl_ops->go_callback(gl, remote);
trace_gfs2_demote_rq(gl);
}
@@ -1091,7 +1091,7 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
spin_lock(&gl->gl_spin);
if (gh->gh_flags & GL_NOCACHE)
- handle_callback(gl, LM_ST_UNLOCKED, 0);
+ handle_callback(gl, LM_ST_UNLOCKED, 0, false);
list_del_init(&gh->gh_list);
if (find_first_holder(gl) == NULL) {
@@ -1296,7 +1296,7 @@ void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
}
spin_lock(&gl->gl_spin);
- handle_callback(gl, state, delay);
+ handle_callback(gl, state, delay, true);
spin_unlock(&gl->gl_spin);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
gfs2_glock_put(gl);
@@ -1409,7 +1409,7 @@ __acquires(&lru_lock)
spin_unlock(&lru_lock);
spin_lock(&gl->gl_spin);
if (demote_ok(gl))
- handle_callback(gl, LM_ST_UNLOCKED, 0);
+ handle_callback(gl, LM_ST_UNLOCKED, 0, false);
WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags));
smp_mb__after_clear_bit();
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
@@ -1534,7 +1534,7 @@ static void clear_glock(struct gfs2_glock *gl)
spin_lock(&gl->gl_spin);
if (gl->gl_state != LM_ST_UNLOCKED)
- handle_callback(gl, LM_ST_UNLOCKED, 0);
+ handle_callback(gl, LM_ST_UNLOCKED, 0, false);
spin_unlock(&gl->gl_spin);
gfs2_glock_hold(gl);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 444b6503ebc4..c66e99c97571 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -515,12 +515,12 @@ static int trans_go_demote_ok(const struct gfs2_glock *gl)
*
* gl_spin lock is held while calling this
*/
-static void iopen_go_callback(struct gfs2_glock *gl)
+static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
{
struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
struct gfs2_sbd *sdp = gl->gl_sbd;
- if (sdp->sd_vfs->s_flags & MS_RDONLY)
+ if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY))
return;
if (gl->gl_demote_state == LM_ST_UNLOCKED &&
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 2532f7ec6b00..26aabd7caba7 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -210,7 +210,7 @@ struct gfs2_glock_operations {
int (*go_lock) (struct gfs2_holder *gh);
void (*go_unlock) (struct gfs2_holder *gh);
int (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
- void (*go_callback) (struct gfs2_glock *gl);
+ void (*go_callback)(struct gfs2_glock *gl, bool remote);
const int go_type;
const unsigned long go_flags;
#define GLOF_ASPACE 1