linux-ext4 - [PATCH 5/6] Btrfs: fail if we try to use hole punch

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Message-Id: <1289248327-16308-5-git-send-email-josef@redhat.com>
Date:	Mon,  8 Nov 2010 15:32:06 -0500
From:	Josef Bacik <josef@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	xfs@....sgi.com, joel.becker@...cle.com, cmm@...ibm.com,
	cluster-devel@...hat.com
Subject: [PATCH 5/6] Btrfs: fail if we try to use hole punch

Btrfs doesn't have the ability to punch holes yet, so make sure we return
EOPNOTSUPP if we try to use hole punching through fallocate.  This support can
be added later.  Thanks,

Signed-off-by: Josef Bacik <josef@...hat.com>
---
 fs/btrfs/inode.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 78877d7..c590add 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6936,6 +6936,10 @@ static long btrfs_fallocate(struct inode *inode, int mode,
 	alloc_start = offset & ~mask;
 	alloc_end =  (offset + len + mask) & ~mask;
 
+	/* We only support the FALLOC_FL_KEEP_SIZE mode */
+	if (mode && (mode & FALLOC_FL_KEEP_SIZE))
+		return -EOPNOTSUPP;
+
 	/*
 	 * wait for ordered IO before we have any locks.  We'll loop again
 	 * below with the locks held.
-- 
1.6.6.1

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