From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 20 Apr 2016 20:31:31 +0000 (-0400)
Subject: proc_fill_cache(): switch to d_alloc_parallel()
X-Git-Tag: v4.7-rc1~144^2~49
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3781764b5cb109152af180a4f17cd3a24d5bc51f;p=platform%2Fkernel%2Flinux-exynos.git

proc_fill_cache(): switch to d_alloc_parallel()

... making it usable with directory locked shared

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/proc/base.c b/fs/proc/base.c
index b1755b2..15b60f1 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1819,12 +1819,17 @@ bool proc_fill_cache(struct file *file, struct dir_context *ctx,
 
 	child = d_hash_and_lookup(dir, &qname);
 	if (!child) {
-		child = d_alloc(dir, &qname);
-		if (!child)
-			goto end_instantiate;
-		if (instantiate(d_inode(dir), child, task, ptr) < 0) {
-			dput(child);
+		DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+		child = d_alloc_parallel(dir, &qname, &wq);
+		if (IS_ERR(child))
 			goto end_instantiate;
+		if (d_in_lookup(child)) {
+			int err = instantiate(d_inode(dir), child, task, ptr);
+			d_lookup_done(child);
+			if (err < 0) {
+				dput(child);
+				goto end_instantiate;
+			}
 		}
 	}
 	inode = d_inode(child);