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From:   Hou Tao <houtao1@huawei.com>
To:     <linux-mtd@lists.infradead.org>
CC:     David Woodhouse <dwmw2@infradead.org>,
        Richard Weinberger <richard@nod.at>,
        <linux-kernel@vger.kernel.org>, <houtao1@huawei.com>
Subject: [PATCH 1/2] jffs2: reset pino_nlink to 0 when inode creation failed
Date:   Wed, 20 Feb 2019 18:21:32 +0800
Message-ID: <20190220102133.7878-2-houtao1@huawei.com>
In-Reply-To: <20190220102133.7878-1-houtao1@huawei.com>
References: <20190220102133.7878-1-houtao1@huawei.com>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
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So jffs2_do_clear_inode() could mark all flash nodes used by
the inode as obsolete and GC procedure will reclaim these
flash nodes, else these flash spaces will not be reclaimable
forever.

Cc: stable@vger.kernel.org
Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 fs/jffs2/dir.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index f20cff1194bb..e02f85e516cb 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -156,6 +156,26 @@ static int jffs2_readdir(struct file *file, struct dir_context *ctx)
 
 /***********************************************************************/
 
+static void jffs2_iget_failed(struct jffs2_sb_info *c, struct inode *inode)
+{
+	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+
+	/*
+	 * Reset pino_nlink to zero, so jffs2_do_clear_inode() will mark
+	 * all flash nodes used by the inode as obsolete and GC procedure
+	 * will reclaim these flash nodes, else these flash spaces will be
+	 * unreclaimable forever.
+	 *
+	 * Update pino_nlink under inocache_lock, because no proceses could
+	 * get the inode due to I_NEW flag, and only GC procedure may try to
+	 * read pino_nlink under inocache_lock.
+	 */
+	spin_lock(&c->inocache_lock);
+	f->inocache->pino_nlink = 0;
+	spin_unlock(&c->inocache_lock);
+
+	iget_failed(inode);
+}
 
 static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
 			umode_t mode, bool excl)
@@ -213,7 +233,7 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
 	return 0;
 
  fail:
-	iget_failed(inode);
+	jffs2_iget_failed(c, inode);
 	jffs2_free_raw_inode(ri);
 	return ret;
 }
@@ -433,7 +453,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
 	return 0;
 
  fail:
-	iget_failed(inode);
+	jffs2_iget_failed(c, inode);
 	return ret;
 }
 
@@ -577,7 +597,7 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode
 	return 0;
 
  fail:
-	iget_failed(inode);
+	jffs2_iget_failed(c, inode);
 	return ret;
 }
 
@@ -748,7 +768,7 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode
 	return 0;
 
  fail:
-	iget_failed(inode);
+	jffs2_iget_failed(c, inode);
 	return ret;
 }
 
-- 
2.16.2.dirty