ocfs2: Support xfs style space reservation ioctls

We re-use the RESVSP/UNRESVSP ioctls from xfs which allow the user to
allocate and deallocate regions to a file without zeroing data or changing
i_size.

Though renamed, the structure passed in from user is identical to struct
xfs_flock64. The three fields that are actually used right now are l_whence,
l_start and l_len.

This should get ocfs2 immediate compatibility with userspace software using
the pre-existing xfs ioctls.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index f3ad21ad9aed..bd68c3f2afbe 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -14,6 +14,7 @@
 #include "ocfs2.h"
 #include "alloc.h"
 #include "dlmglue.h"
+#include "file.h"
 #include "inode.h"
 #include "journal.h"
 
@@ -115,6 +116,7 @@ int ocfs2_ioctl(struct inode * inode, struct file * filp,
 {
         unsigned int flags;
         int status;
+        struct ocfs2_space_resv sr;
 
         switch (cmd) {
         case OCFS2_IOC_GETFLAGS:
@@ -130,6 +132,14 @@ int ocfs2_ioctl(struct inode * inode, struct file * filp,
 
                 return ocfs2_set_inode_attr(inode, flags,
                         OCFS2_FL_MODIFIABLE);
+        case OCFS2_IOC_RESVSP:
+        case OCFS2_IOC_RESVSP64:
+        case OCFS2_IOC_UNRESVSP:
+        case OCFS2_IOC_UNRESVSP64:
+                if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
+                        return -EFAULT;
+
+                return ocfs2_change_file_space(filp, cmd, &sr);
         default:
                 return -ENOTTY;
         }
@@ -148,6 +158,11 @@ long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
         case OCFS2_IOC32_SETFLAGS:
                 cmd = OCFS2_IOC_SETFLAGS;
                 break;
+        case OCFS2_IOC_RESVSP:
+        case OCFS2_IOC_RESVSP64:
+        case OCFS2_IOC_UNRESVSP:
+        case OCFS2_IOC_UNRESVSP64:
+                break;
         default:
                 return -ENOIOCTLCMD;
         }