linux-kernel - [PATCH 3.19.y-ckt 112/251] fs/ufs: revert "ufs: fix deadlocks introduced by sb mutex merge"

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Message-Id: <1437008972-9140-113-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:13 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Fabian Frederick <fabf@...net.be>,
	Ian Campbell <ian.campbell@...rix.com>,
	Evgeniy Dushistov <dushistov@...l.ru>,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Roger Pau Monne <roger.pau@...rix.com>,
	Ian Jackson <Ian.Jackson@...citrix.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 112/251] fs/ufs: revert "ufs: fix deadlocks introduced by sb mutex merge"

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fabian Frederick <fabf@...net.be>

commit 13b987ea275840d74d9df9a44326632fab1894da upstream.

This reverts commit 9ef7db7f38d0 ("ufs: fix deadlocks introduced by sb
mutex merge") That patch tried to solve commit 0244756edc4b98c ("ufs: sb
mutex merge + mutex_destroy") which is itself partially reverted due to
multiple deadlocks.

Signed-off-by: Fabian Frederick <fabf@...net.be>
Suggested-by: Jan Kara <jack@...e.cz>
Cc: Ian Campbell <ian.campbell@...rix.com>
Cc: Evgeniy Dushistov <dushistov@...l.ru>
Cc: Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc: Roger Pau Monne <roger.pau@...rix.com>
Cc: Ian Jackson <Ian.Jackson@...citrix.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/ufs/inode.c |  5 ++++-
 fs/ufs/namei.c | 14 ++++++++------
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index be7d42c..2d93ab0 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -902,6 +902,9 @@ void ufs_evict_inode(struct inode * inode)
 	invalidate_inode_buffers(inode);
 	clear_inode(inode);
 
-	if (want_delete)
+	if (want_delete) {
+		lock_ufs(inode->i_sb);
 		ufs_free_inode(inode);
+		unlock_ufs(inode->i_sb);
+	}
 }
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index fd65deb..6515899 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -128,12 +128,12 @@ static int ufs_symlink (struct inode * dir, struct dentry * dentry,
 	if (l > sb->s_blocksize)
 		goto out_notlocked;
 
+	lock_ufs(dir->i_sb);
 	inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
-		goto out_notlocked;
+		goto out;
 
-	lock_ufs(dir->i_sb);
 	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
 		/* slow symlink */
 		inode->i_op = &ufs_symlink_inode_operations;
@@ -184,9 +184,13 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 	struct inode * inode;
 	int err;
 
+	lock_ufs(dir->i_sb);
+	inode_inc_link_count(dir);
+
 	inode = ufs_new_inode(dir, S_IFDIR|mode);
+	err = PTR_ERR(inode);
 	if (IS_ERR(inode))
-		return PTR_ERR(inode);
+		goto out_dir;
 
 	inode->i_op = &ufs_dir_inode_operations;
 	inode->i_fop = &ufs_dir_operations;
@@ -194,9 +198,6 @@ static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 
 	inode_inc_link_count(inode);
 
-	lock_ufs(dir->i_sb);
-	inode_inc_link_count(dir);
-
 	err = ufs_make_empty(inode, dir);
 	if (err)
 		goto out_fail;
@@ -215,6 +216,7 @@ out_fail:
 	inode_dec_link_count(inode);
 	unlock_new_inode(inode);
 	iput (inode);
+out_dir:
 	inode_dec_link_count(dir);
 	unlock_ufs(dir->i_sb);
 	goto out;
-- 
1.9.1

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