linux-kernel - [PATCH] XFS ->fallocate() support

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Message-ID: <20070430031121.GO32602149@melbourne.sgi.com>
Date:	Mon, 30 Apr 2007 13:11:21 +1000
From:	David Chinner <dgc@....com>
To:	David Chinner <dgc@....com>
Cc:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>, torvalds@...l.org,
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, suparna@...ibm.com, cmm@...ibm.com
Subject: [PATCH] XFS ->fallocate() support

Add XFS support for ->fallocate() vector.

Signed-Off-By: Dave Chinner <dgc@....com>

---
 fs/xfs/linux-2.6/xfs_iops.c |   48 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

Index: 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_iops.c
===================================================================
--- 2.6.x-xfs-new.orig/fs/xfs/linux-2.6/xfs_iops.c	2007-02-07 13:24:32.000000000 +1100
+++ 2.6.x-xfs-new/fs/xfs/linux-2.6/xfs_iops.c	2007-04-30 11:02:16.225095992 +1000
@@ -812,6 +812,53 @@ xfs_vn_removexattr(
 	return namesp->attr_remove(vp, attr, xflags);
 }
 
+STATIC long
+xfs_vn_fallocate(
+	struct inode	*inode,
+	int		mode,
+	loff_t		offset,
+	loff_t		len)
+{
+	long		error = -EOPNOTSUPP;
+	bhv_vnode_t	*vp = vn_from_inode(inode);
+	bhv_desc_t	*bdp;
+	int		do_setattr = 0;
+	xfs_flock64_t	bf;
+
+	bf.l_whence = 0;
+	bf.l_start = offset;
+	bf.l_len = len;
+
+	bdp = bhv_lookup_range(VN_BHV_HEAD(vp), VNODE_POSITION_XFS,
+						VNODE_POSITION_XFS);
+
+	switch (mode) {
+	case FA_ALLOCATE: /* changes file size */
+		error = xfs_change_file_space(bdp, XFS_IOC_RESVSP,
+						&bf, 0, NULL, 0);
+		if (offset + len > i_size_read(inode))
+			do_setattr = offset + len;
+		break;
+	case FA_DEALLOCATE:
+		/* XXX: changes file size?  this just punches a hole */
+		error = xfs_change_file_space(bdp, XFS_IOC_UNRESVSP,
+						&bf, 0, NULL, 0);
+		break;
+	default:
+		break;
+	}
+
+	/* Change file size if needed */
+	if (!error && do_setattr) {
+		bhv_vattr_t	va;
+
+		va.va_mask = XFS_AT_SIZE;
+		va.va_size = do_setattr;
+		error = bhv_vop_setattr(vp, &va, 0, NULL);
+	}
+
+	return error;
+}
 
 struct inode_operations xfs_inode_operations = {
 	.permission		= xfs_vn_permission,
@@ -822,6 +869,7 @@ struct inode_operations xfs_inode_operat
 	.getxattr		= xfs_vn_getxattr,
 	.listxattr		= xfs_vn_listxattr,
 	.removexattr		= xfs_vn_removexattr,
+	.fallocate		= xfs_vn_fallocate,
 };
 
 struct inode_operations xfs_dir_inode_operations = {
-
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