From: Andrew Morton <akpm@osdl.org>
Date: Wed, 1 Feb 2006 11:04:39 +0000 (-0800)
Subject: [PATCH] smbfs readdir vs signal fix
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=caf736085f2f0d22a992a855d9caae14973f7ea4;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[PATCH] smbfs readdir vs signal fix

An old patch designed to fix http://bugme.osdl.org/show_bug.cgi?id=4497,
"getdents gives empty/random result upon signal".

If smbfs's readdir() is interupted by a signal, smb_readdir() failed to
noticed that and proceeded to treat the unread-into page as valid directory
contents.  Fix that up by handling the -ERESTARTSYS.

Thanks to Stian Skjelstad for reporting and testing.

Cc: Stian Skjelstad <stian@nixia.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c
index c6c33e15143a..0424d06b147e 100644
--- a/fs/smbfs/dir.c
+++ b/fs/smbfs/dir.c
@@ -209,6 +209,8 @@ init_cache:
 	ctl.valid  = 1;
 read_really:
 	result = server->ops->readdir(filp, dirent, filldir, &ctl);
+	if (result == -ERESTARTSYS && page)
+		ClearPageUptodate(page);
 	if (ctl.idx == -1)
 		goto invalid_cache;	/* retry */
 	ctl.head.end = ctl.fpos - 1;
@@ -217,7 +219,8 @@ finished:
 	if (page) {
 		cache->head = ctl.head;
 		kunmap(page);
-		SetPageUptodate(page);
+		if (result != -ERESTARTSYS)
+			SetPageUptodate(page);
 		unlock_page(page);
 		page_cache_release(page);
 	}