[PATCH] Force remount read-only of jffs2 when the garbage collector dies

[Michael Trimarchi <trimarchimichael@yahoo.it>]

[-- Attachment #1: Type: text/plain, Size: 122 bytes --]




      Inviato da Yahoo! Mail. 
La casella di posta intelligente.
http://it.docs.yahoo.com/mail/overview/index.html

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: force-remount-readonly-jffs2.patch --]
[-- Type: text/x-patch; name="force-remount-readonly-jffs2.patch", Size: 1304 bytes --]

[PATCH] Force remount read-only of jffs2 when the garbage collector dies

Signed-off-by: Michael Trimarchi <michael@evidence.eu.com>

---
 fs/jffs2/background.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index 8adebd3..669b35e 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -70,6 +70,7 @@ void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c)
 static int jffs2_garbage_collect_thread(void *_c)
 {
 	struct jffs2_sb_info *c = _c;
+	struct super_block *sb;
 
 	daemonize("jffs2_gcd_mtd%d", c->mtd->index);
 	allow_signal(SIGKILL);
@@ -145,5 +146,25 @@ static int jffs2_garbage_collect_thread(void *_c)
 	spin_lock(&c->erase_completion_lock);
 	c->gc_task = NULL;
 	spin_unlock(&c->erase_completion_lock);
+
+	sb = c->os_priv;
+	BUG_ON(sb == NULL);
+
+	/* The garbage collect is died. Try to remount the fs
+	 * read-only
+	 */
+	down_read(&sb->s_umount);
+	if (sb->s_root && sb->s_mtd && !(sb->s_flags & MS_RDONLY)) {
+		/*
+		 * ->remount_fs needs lock_kernel().
+		 *
+		 * What lock protects sb->s_flags??
+		 */
+		lock_kernel();
+		do_remount_sb(sb, MS_RDONLY, NULL, 1);
+		unlock_kernel();
+	}
+	drop_super(sb);
+
 	complete_and_exit(&c->gc_thread_exit, 0);
 }
-- 
1.5.3.6