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

To: linux-kernel@xxxxxxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx, joel.becker@xxxxxxxxxx, cmm@xxxxxxxxxx, cluster-devel@xxxxxxxxxx
Subject: [PATCH 5/6] Btrfs: fail if we try to use hole punch
From: Josef Bacik <josef@xxxxxxxxxx>
Date: Mon, 8 Nov 2010 15:32:06 -0500
In-reply-to: <1289248327-16308-1-git-send-email-josef@xxxxxxxxxx>
References: <1289248327-16308-1-git-send-email-josef@xxxxxxxxxx>
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@xxxxxxxxxx>
---
 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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