int
vm_swapfile_preallocate(vnode_t vp, uint64_t *size)
{
int error = 0;
uint64_t file_size = 0;
vfs_context_t ctx = NULL;
ctx = vfs_context_current();
#if CONFIG_PROTECT
{
#if 0 // <rdar://11771612>
if ((error = cp_vnode_setclass(vp, PROTECTION_CLASS_F))) {
if(config_protect_bug) {
printf("swap protection class set failed with %d\n", error);
} else {
panic("swap protection class set failed with %d\n", error);
}
}
#endif
/* initialize content protection keys manually */
if ((error = cp_handle_vnop(vp, CP_WRITE_ACCESS, 0)) != 0) {
printf("Content Protection key failure on swap: %d\n", error);
vnode_put(vp);
vp = NULL;
goto done;
}
}
#endif
/*
* This check exists because dynamic_pager creates the 1st swapfile,
* swapfile0, for us from user-space in a supported manner (with IO_NOZEROFILL etc).
*
* If dynamic_pager, in the future, discontinues creating that file,
* then we need to change this check to a panic / assert or return an error.
* That's because we can't be sure if the file has been created correctly.
*/
if ((error = vnode_size(vp, (off_t*) &file_size, ctx)) != 0) {
printf("vnode_size (existing files) for swap files failed: %d\n", error);
goto done;
} else {
if (file_size == 0) {
error = vnode_setsize(vp, *size, IO_NOZEROFILL, ctx);
if (error) {
printf("vnode_setsize for swap files failed: %d\n", error);
goto done;
}
} else {
*size = file_size;
}
}
vnode_lock_spin(vp);
SET(vp->v_flag, VSWAP);
vnode_unlock(vp);
done:
return error;
}
int
vm_swapfile_preallocate(vnode_t vp, uint64_t *size, boolean_t *pin)
{
int error = 0;
uint64_t file_size = 0;
vfs_context_t ctx = NULL;
ctx = vfs_context_current();
#if CONFIG_PROTECT
{
#if 0 // <rdar://11771612>
if ((error = cp_vnode_setclass(vp, PROTECTION_CLASS_F))) {
if(config_protect_bug) {
printf("swap protection class set failed with %d\n", error);
} else {
panic("swap protection class set failed with %d\n", error);
}
}
#endif
/* initialize content protection keys manually */
if ((error = cp_handle_vnop(vp, CP_WRITE_ACCESS, 0)) != 0) {
printf("Content Protection key failure on swap: %d\n", error);
vnode_put(vp);
vp = NULL;
goto done;
}
}
#endif
error = vnode_setsize(vp, *size, IO_NOZEROFILL, ctx);
if (error) {
printf("vnode_setsize for swap files failed: %d\n", error);
goto done;
}
error = vnode_size(vp, (off_t*) &file_size, ctx);
if (error) {
printf("vnode_size (new file) for swap file failed: %d\n", error);
goto done;
}
assert(file_size == *size);
if (pin != NULL && *pin != FALSE) {
assert(vnode_tag(vp) == VT_HFS);
error = hfs_pin_vnode(VTOHFS(vp), vp, HFS_PIN_IT | HFS_DATALESS_PIN, NULL, ctx);
if (error) {
printf("hfs_pin_vnode for swap files failed: %d\n", error);
/* this is not fatal, carry on with files wherever they landed */
*pin = FALSE;
error = 0;
}
}
vnode_lock_spin(vp);
SET(vp->v_flag, VSWAP);
vnode_unlock(vp);
done:
return error;
}
