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@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 94d5fd6..da54403 100644 (file)
--- 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;
@@ -528,6 +529,9 @@ 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) &&
            offset + len > i_size_read(inode)) {
@@ -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;