/**
* ntfs_usnjrnl_stamp - stamp the transaction log ($UsnJrnl) on an ntfs volume
* @vol: ntfs volume on which to stamp the transaction log
*
* Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return 0
* on success and errno on error.
*
* This function assumes that the transaction log has already been loaded and
* consistency checked by a call to ntfs_vfsops.c::ntfs_usnjrnl_load().
*/
errno_t ntfs_usnjrnl_stamp(ntfs_volume *vol)
{
ntfs_debug("Entering.");
if (!NVolUsnJrnlStamped(vol)) {
sle64 j_size, stamp;
upl_t upl;
upl_page_info_array_t pl;
USN_HEADER *uh;
ntfs_inode *max_ni;
errno_t err;
mtx_lock_spin(&vol->usnjrnl_j_ni->size_lock);
j_size = vol->usnjrnl_j_ni->data_size;
mtx_unlock_spin(&vol->usnjrnl_j_ni->size_lock);
max_ni = vol->usnjrnl_max_ni;
/*
* FIXME: Next If statement always false because of
* replacing vnode_get() with vhold()
*/
vhold(max_ni->vn);
if (0) {
ntfs_error(vol->mp, "Failed to get vnode for "
"$UsnJrnl/$DATA/$Max.");
return err;
}
sx_slock(&max_ni->lock);
err = ntfs_page_map(max_ni, 0, &upl, &pl, (u8**)&uh, TRUE);
if (err) {
ntfs_error(vol->mp, "Failed to read from "
"$UsnJrnl/$DATA/$Max attribute.");
vdrop(max_ni->vn);
return err;
}
stamp = ntfs_current_time();
ntfs_debug("Stamping transaction log ($UsnJrnl): old "
"journal_id 0x%llx, old lowest_valid_usn "
"0x%llx, new journal_id 0x%llx, new "
"lowest_valid_usn 0x%llx.",
(unsigned long long)
sle64_to_cpu(uh->journal_id),
(unsigned long long)
sle64_to_cpu(uh->lowest_valid_usn),
(unsigned long long)sle64_to_cpu(stamp),
(unsigned long long)j_size);
uh->lowest_valid_usn = cpu_to_sle64(j_size);
uh->journal_id = stamp;
ntfs_page_unmap(max_ni, upl, pl, TRUE);
sx_sunlock(&max_ni->lock);
vdrop(max_ni->vn);
/* Set the flag so we do not have to do it again on remount. */
NVolSetUsnJrnlStamped(vol);
// TODO: Should we mark any times on the base inode $UsnJrnl
// for update here?
}
ntfs_debug("Done.");
return 0;
}
/**
* ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
* @vol: ntfs volume on which to stamp the transaction log
*
* Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return
* 'true' on success and 'false' on error.
*
* This function assumes that the transaction log has already been loaded and
* consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
*/
bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
{
ntfs_debug("Entering.");
if (likely(!NVolUsnJrnlStamped(vol))) {
sle64 stamp;
struct page *page;
USN_HEADER *uh;
page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
if (IS_ERR(page)) {
ntfs_error(vol->sb, "Failed to read from "
"$UsnJrnl/$DATA/$Max attribute.");
return false;
}
uh = (USN_HEADER*)page_address(page);
stamp = get_current_ntfs_time();
ntfs_debug("Stamping transaction log ($UsnJrnl): old "
"journal_id 0x%llx, old lowest_valid_usn "
"0x%llx, new journal_id 0x%llx, new "
"lowest_valid_usn 0x%llx.",
(long long)sle64_to_cpu(uh->journal_id),
(long long)sle64_to_cpu(uh->lowest_valid_usn),
(long long)sle64_to_cpu(stamp),
i_size_read(vol->usnjrnl_j_ino));
uh->lowest_valid_usn =
cpu_to_sle64(i_size_read(vol->usnjrnl_j_ino));
uh->journal_id = stamp;
flush_dcache_page(page);
set_page_dirty(page);
ntfs_unmap_page(page);
/* Set the flag so we do not have to do it again on remount. */
NVolSetUsnJrnlStamped(vol);
}
ntfs_debug("Done.");
return true;
}
