linux-kernel - [PATCH 2/6] XFS: handle hole punching via fallocate properly

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Message-Id: <1289840723-3056-3-git-send-email-josef@redhat.com>
Date:	Mon, 15 Nov 2010 12:05:19 -0500
From:	Josef Bacik <josef@...hat.com>
To:	david@...morbit.com, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com, cmm@...ibm.com,
	cluster-devel@...hat.com, ocfs2-devel@....oracle.com
Subject: [PATCH 2/6] XFS: handle hole punching via fallocate properly

This patch simply allows XFS to handle the hole punching flag in fallocate
properly.  I've tested this with a little program that does a bunch of random
hole punching with FL_KEEP_SIZE and without it to make sure it does the right
thing.  Thanks,

Signed-off-by: Josef Bacik <josef@...hat.com>
---
 fs/xfs/linux-2.6/xfs_iops.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 96107ef..63cc929 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -516,6 +516,7 @@ xfs_vn_fallocate(
 	loff_t		new_size = 0;
 	xfs_flock64_t	bf;
 	xfs_inode_t	*ip = XFS_I(inode);
+	int		cmd = XFS_IOC_RESVSP;
 
 	/* preallocation on directories not yet supported */
 	error = -ENODEV;
@@ -528,8 +529,11 @@ xfs_vn_fallocate(
 
 	xfs_ilock(ip, XFS_IOLOCK_EXCL);
 
+	if (mode & FALLOC_FL_PUNCH_HOLE)
+		cmd = XFS_IOC_UNRESVSP;
+
 	/* check the new inode size is valid before allocating */
-	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
+	if (!(mode & (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) &&
 	    offset + len > i_size_read(inode)) {
 		new_size = offset + len;
 		error = inode_newsize_ok(inode, new_size);
@@ -537,8 +541,7 @@ xfs_vn_fallocate(
 			goto out_unlock;
 	}
 
-	error = -xfs_change_file_space(ip, XFS_IOC_RESVSP, &bf,
-				       0, XFS_ATTR_NOLOCK);
+	error = -xfs_change_file_space(ip, cmd, &bf, 0, XFS_ATTR_NOLOCK);
 	if (error)
 		goto out_unlock;
 
-- 
1.6.6.1

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