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ocfs2: Support xfs style space reservation ioctls

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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>
This commit is contained in:
Mark Fasheh
2007-03-09 16:53:21 -08:00
parent 063c4561f5
commit b25801038d
6 changed files with 216 additions and 16 deletions
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15
fs/ocfs2/ioctl.c
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@@ -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;
}