Hi Nate,
It appears FIFREEZE AND FITHAW are already built into the kernel.
Here is the defines in ~/linux/include/linux/fs.h(Also in
~linux/include/uapi/linux/fs.h):
#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
#define FITHAW _IOWR('X', 120, int) /* Thaw */
In ~linux/fs/ioctl.c, there is a switch for FIFREEZE AND FITHAW:
do_vfs_ioctl()
case FIFREEZE:
error = ioctl_fsfreeze(filp);
break;
case FITHAW:
error = ioctl_fsthaw(filp);
break;
These switch statements then call ioctl_fsfreeze() or ioctl_fsthaw():
static int ioctl_fsfreeze(struct file *filp)
{
struct super_block *sb = filp->f_path.dentry->d_inode->i_sb;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
/* If filesystem doesn't support freeze feature, return. */
if (sb->s_op->freeze_fs == NULL)
return -EOPNOTSUPP;
/* Freeze */
return freeze_super(sb);
}
ioctl_fsfreeze() then does a check to see if freeze is supported by the
filesystem.
Do you have a more complete log of the failure you are seeing when
vmsync doesn't compile? If it was working prior to the v3.6 kernel,
then that would also indicate this is a regression versus a new feature
request.
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1088053
Title:
Kernel needs to provide FIFREEZE/FITHAW ioctl so that open-vm-dkms can
build
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