linux-kernel - [PATCH v4 08/13] locks: consolidate checks for compatible filp->f

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Message-Id: <1387460065-28269-9-git-send-email-jlayton@redhat.com>
Date:	Thu, 19 Dec 2013 08:34:20 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-fsdevel@...r.kernel.org
Cc:	nfs-ganesha-devel@...ts.sourceforge.net,
	samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 08/13] locks: consolidate checks for compatible filp->f_mode values in setlk handlers

Move this check into flock64_to_posix_lock instead of duplicating it in
two places. This also fixes a minor wart in the code where we continue
referring to the struct flock after converting it to struct file_lock.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/locks.c | 46 ++++++++++++----------------------------------
 1 file changed, 12 insertions(+), 34 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 1555b05..820322d 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -387,6 +387,18 @@ static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,
 	fl->fl_ops = NULL;
 	fl->fl_lmops = NULL;
 
+	/* Ensure that fl->fl_filp has compatible f_mode */
+	switch (l->l_type) {
+	case F_RDLCK:
+		if (!(filp->f_mode & FMODE_READ))
+			return -EBADF;
+		break;
+	case F_WRLCK:
+		if (!(filp->f_mode & FMODE_WRITE))
+			return -EBADF;
+		break;
+	}
+
 	return assign_type(fl, l->l_type);
 }
 
@@ -2024,23 +2036,6 @@ again:
 		file_lock->fl_flags |= FL_SLEEP;
 	}
 	
-	error = -EBADF;
-	switch (flock.l_type) {
-	case F_RDLCK:
-		if (!(filp->f_mode & FMODE_READ))
-			goto out;
-		break;
-	case F_WRLCK:
-		if (!(filp->f_mode & FMODE_WRITE))
-			goto out;
-		break;
-	case F_UNLCK:
-		break;
-	default:
-		error = -EINVAL;
-		goto out;
-	}
-
 	error = do_lock_file_wait(filp, cmd, file_lock);
 
 	/*
@@ -2142,23 +2137,6 @@ again:
 		file_lock->fl_flags |= FL_SLEEP;
 	}
 	
-	error = -EBADF;
-	switch (flock.l_type) {
-	case F_RDLCK:
-		if (!(filp->f_mode & FMODE_READ))
-			goto out;
-		break;
-	case F_WRLCK:
-		if (!(filp->f_mode & FMODE_WRITE))
-			goto out;
-		break;
-	case F_UNLCK:
-		break;
-	default:
-		error = -EINVAL;
-		goto out;
-	}
-
 	error = do_lock_file_wait(filp, cmd, file_lock);
 
 	/*
-- 
1.8.4.2

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