linux-kernel - [PATCH 14/30] Unionfs: remove unnecessary conditional inode lock

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Message-Id: <11988745922794-git-send-email-ezk@cs.sunysb.edu>
Date:	Fri, 28 Dec 2007 15:42:48 -0500
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 14/30] Unionfs: remove unnecessary conditional inode lock

This was intended to protect the inode during branch management, but that is
now done through our superblock rwsem.

Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/dentry.c |   13 -------------
 1 files changed, 0 insertions(+), 13 deletions(-)

diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index 68c07ba..dc1aa39 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -33,7 +33,6 @@ static bool __unionfs_d_revalidate_one(struct dentry *dentry,
 	int bindex, bstart, bend;
 	int sbgen, dgen;
 	int positive = 0;
-	int locked = 0;
 	int interpose_flag;
 	struct nameidata lowernd; /* TODO: be gentler to the stack */
 
@@ -87,16 +86,6 @@ static bool __unionfs_d_revalidate_one(struct dentry *dentry,
 		interpose_flag = INTERPOSE_REVAL_NEG;
 		if (positive) {
 			interpose_flag = INTERPOSE_REVAL;
-			/*
-			 * During BRM, the VFS could already hold a lock on
-			 * a file being read, so don't lock it again
-			 * (deadlock), but if you lock it in this function,
-			 * then release it here too.
-			 */
-			if (!mutex_is_locked(&dentry->d_inode->i_mutex)) {
-				mutex_lock(&dentry->d_inode->i_mutex);
-				locked = 1;
-			}
 
 			bstart = ibstart(dentry->d_inode);
 			bend = ibend(dentry->d_inode);
@@ -115,8 +104,6 @@ static bool __unionfs_d_revalidate_one(struct dentry *dentry,
 			UNIONFS_I(dentry->d_inode)->lower_inodes = NULL;
 			ibstart(dentry->d_inode) = -1;
 			ibend(dentry->d_inode) = -1;
-			if (locked)
-				mutex_unlock(&dentry->d_inode->i_mutex);
 		}
 
 		result = unionfs_lookup_backend(dentry, &lowernd,
-- 
1.5.2.2

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