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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>
This commit is contained in:
Steven Whitehouse 2013-04-10 10:26:55 +01:00
parent 16ca9412d8
commit 81ffbf654f
3 changed files with 9 additions and 9 deletions
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12
fs/gfs2/glock.c
View File

@ -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)

4
fs/gfs2/glops.c
View File

@ -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 &&

2
fs/gfs2/incore.h
View File

@ -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