[PATCH] XFS ->fallocate() support

David Chinner
2007-04-30T03:11:51Z

Add XFS support for ->fallocate() vector.

Signed-Off-By: Dave Chinner <dgc@sgi.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 = {