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-rw-r--r--fs/gfs2/glock.c49
1 files changed, 43 insertions, 6 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index d6bf1f8c25..34540f9d01 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -156,7 +156,7 @@ static bool glock_blocked_by_withdraw(struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
- if (likely(!gfs2_withdrawn(sdp)))
+ if (!gfs2_withdrawing_or_withdrawn(sdp))
return false;
if (gl->gl_ops->go_flags & GLOF_NONDISK)
return false;
@@ -278,7 +278,7 @@ static void __gfs2_glock_put(struct gfs2_glock *gl)
GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
if (mapping) {
truncate_inode_pages_final(mapping);
- if (!gfs2_withdrawn(sdp))
+ if (!gfs2_withdrawing_or_withdrawn(sdp))
GLOCK_BUG_ON(gl, !mapping_empty(mapping));
}
trace_gfs2_glock_put(gl);
@@ -517,6 +517,23 @@ static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl)
}
/**
+ * find_last_waiter - find the last gh that's waiting for the glock
+ * @gl: the glock
+ *
+ * This also is a fast way of finding out if there are any waiters.
+ */
+
+static inline struct gfs2_holder *find_last_waiter(const struct gfs2_glock *gl)
+{
+ struct gfs2_holder *gh;
+
+ if (list_empty(&gl->gl_holders))
+ return NULL;
+ gh = list_last_entry(&gl->gl_holders, struct gfs2_holder, gh_list);
+ return test_bit(HIF_HOLDER, &gh->gh_iflags) ? NULL : gh;
+}
+
+/**
* state_change - record that the glock is now in a different state
* @gl: the glock
* @new_state: the new state
@@ -757,7 +774,7 @@ skip_inval:
* gfs2_gl_hash_clear calls clear_glock) and recovery is complete
* then it's okay to tell dlm to unlock it.
*/
- if (unlikely(sdp->sd_log_error && !gfs2_withdrawn(sdp)))
+ if (unlikely(sdp->sd_log_error) && !gfs2_withdrawing_or_withdrawn(sdp))
gfs2_withdraw_delayed(sdp);
if (glock_blocked_by_withdraw(gl) &&
(target != LM_ST_UNLOCKED ||
@@ -794,7 +811,7 @@ skip_inval:
gfs2_glock_queue_work(gl, 0);
} else if (ret) {
fs_err(sdp, "lm_lock ret %d\n", ret);
- GLOCK_BUG_ON(gl, !gfs2_withdrawn(sdp));
+ GLOCK_BUG_ON(gl, !gfs2_withdrawing_or_withdrawn(sdp));
}
} else { /* lock_nolock */
finish_xmote(gl, target);
@@ -1213,7 +1230,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
mapping->host = s->s_bdev->bd_inode;
mapping->flags = 0;
mapping_set_gfp_mask(mapping, GFP_NOFS);
- mapping->private_data = NULL;
+ mapping->i_private_data = NULL;
mapping->writeback_index = 0;
}
@@ -1555,11 +1572,30 @@ trap_recursive:
int gfs2_glock_nq(struct gfs2_holder *gh)
{
struct gfs2_glock *gl = gh->gh_gl;
- int error = 0;
+ int error;
if (glock_blocked_by_withdraw(gl) && !(gh->gh_flags & LM_FLAG_NOEXP))
return -EIO;
+ if (gh->gh_flags & GL_NOBLOCK) {
+ struct gfs2_holder *current_gh;
+
+ error = -ECHILD;
+ spin_lock(&gl->gl_lockref.lock);
+ if (find_last_waiter(gl))
+ goto unlock;
+ current_gh = find_first_holder(gl);
+ if (!may_grant(gl, current_gh, gh))
+ goto unlock;
+ set_bit(HIF_HOLDER, &gh->gh_iflags);
+ list_add_tail(&gh->gh_list, &gl->gl_holders);
+ trace_gfs2_promote(gh);
+ error = 0;
+unlock:
+ spin_unlock(&gl->gl_lockref.lock);
+ return error;
+ }
+
if (test_bit(GLF_LRU, &gl->gl_flags))
gfs2_glock_remove_from_lru(gl);
@@ -1575,6 +1611,7 @@ int gfs2_glock_nq(struct gfs2_holder *gh)
run_queue(gl, 1);
spin_unlock(&gl->gl_lockref.lock);
+ error = 0;
if (!(gh->gh_flags & GL_ASYNC))
error = gfs2_glock_wait(gh);