diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 7235d53..d671084 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -940,7 +940,7 @@
 		else if (height == ip->i_height)
 			ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
 		else
-			iomap->length = size - pos;
+			iomap->length = size - iomap->offset;
 	} else if (flags & IOMAP_WRITE) {
 		u64 alloc_size;
 
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index adafaaf..3e718cf 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -773,8 +773,8 @@
 					 size_t *prev_count,
 					 size_t *window_size)
 {
-	char __user *p = i->iov[0].iov_base + i->iov_offset;
 	size_t count = iov_iter_count(i);
+	char __user *p;
 	int pages = 1;
 
 	if (likely(!count))
@@ -787,14 +787,14 @@
 	if (*prev_count != count || !*window_size) {
 		int pages, nr_dirtied;
 
-		pages = min_t(int, BIO_MAX_VECS,
-			      DIV_ROUND_UP(iov_iter_count(i), PAGE_SIZE));
+		pages = min_t(int, BIO_MAX_VECS, DIV_ROUND_UP(count, PAGE_SIZE));
 		nr_dirtied = max(current->nr_dirtied_pause -
 				 current->nr_dirtied, 1);
 		pages = min(pages, nr_dirtied);
 	}
 
 	*prev_count = count;
+	p = i->iov[0].iov_base + i->iov_offset;
 	*window_size = (size_t)PAGE_SIZE * pages - offset_in_page(p);
 	return true;
 }
@@ -1013,6 +1013,7 @@
 	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	struct gfs2_holder *statfs_gh = NULL;
 	size_t prev_count = 0, window_size = 0;
+	size_t orig_count = iov_iter_count(from);
 	size_t read = 0;
 	ssize_t ret;
 
@@ -1057,6 +1058,7 @@
 	if (inode == sdp->sd_rindex)
 		gfs2_glock_dq_uninit(statfs_gh);
 
+	from->count = orig_count - read;
 	if (should_fault_in_pages(ret, from, &prev_count, &window_size)) {
 		size_t leftover;
 
@@ -1064,6 +1066,7 @@
 		leftover = fault_in_iov_iter_readable(from, window_size);
 		gfs2_holder_disallow_demote(gh);
 		if (leftover != window_size) {
+			from->count = min(from->count, window_size - leftover);
 			if (!gfs2_holder_queued(gh)) {
 				if (read)
 					goto out_uninit;
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 19f38ae..8dbd6fe 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -411,14 +411,14 @@
 static void demote_incompat_holders(struct gfs2_glock *gl,
 				    struct gfs2_holder *new_gh)
 {
-	struct gfs2_holder *gh;
+	struct gfs2_holder *gh, *tmp;
 
 	/*
 	 * Demote incompatible holders before we make ourselves eligible.
 	 * (This holder may or may not allow auto-demoting, but we don't want
 	 * to demote the new holder before it's even granted.)
 	 */
-	list_for_each_entry(gh, &gl->gl_holders, gh_list) {
+	list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
 		/*
 		 * Since holders are at the front of the list, we stop when we
 		 * find the first non-holder.
@@ -496,7 +496,7 @@
 	 * Since we unlock the lockref lock, we set a flag to indicate
 	 * instantiate is in progress.
 	 */
-	if (test_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags)) {
+	if (test_and_set_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags)) {
 		wait_on_bit(&gl->gl_flags, GLF_INSTANTIATE_IN_PROG,
 			    TASK_UNINTERRUPTIBLE);
 		/*
@@ -509,14 +509,10 @@
 		goto again;
 	}
 
-	set_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags);
-
 	ret = glops->go_instantiate(gh);
 	if (!ret)
 		clear_bit(GLF_INSTANTIATE_NEEDED, &gl->gl_flags);
-	clear_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags);
-	smp_mb__after_atomic();
-	wake_up_bit(&gl->gl_flags, GLF_INSTANTIATE_IN_PROG);
+	clear_and_wake_up_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags);
 	return ret;
 }
 
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 5b12137..0f93e8b 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1402,13 +1402,6 @@
 	gfs2_ordered_del_inode(ip);
 	clear_inode(inode);
 	gfs2_dir_hash_inval(ip);
-	if (ip->i_gl) {
-		glock_clear_object(ip->i_gl, ip);
-		wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
-		gfs2_glock_add_to_lru(ip->i_gl);
-		gfs2_glock_put_eventually(ip->i_gl);
-		ip->i_gl = NULL;
-	}
 	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
 		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
 
@@ -1421,6 +1414,13 @@
 		gfs2_holder_uninit(&ip->i_iopen_gh);
 		gfs2_glock_put_eventually(gl);
 	}
+	if (ip->i_gl) {
+		glock_clear_object(ip->i_gl, ip);
+		wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
+		gfs2_glock_add_to_lru(ip->i_gl);
+		gfs2_glock_put_eventually(ip->i_gl);
+		ip->i_gl = NULL;
+	}
 }
 
 static struct inode *gfs2_alloc_inode(struct super_block *sb)