serial_core: Get a reference for port->tty in uart_remove_one_port()
[linux/fpc-iii.git] / fs / ntfs / usnjrnl.c
blobb2bc0d55b0365b854173b1c2802ce2f78e99bc7a
1 /*
2 * usnjrnl.h - NTFS kernel transaction log ($UsnJrnl) handling. Part of the
3 * Linux-NTFS project.
5 * Copyright (c) 2005 Anton Altaparmakov
7 * This program/include file is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program/include file is distributed in the hope that it will be
13 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program (in the main directory of the Linux-NTFS
19 * distribution in the file COPYING); if not, write to the Free Software
20 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #ifdef NTFS_RW
25 #include <linux/fs.h>
26 #include <linux/highmem.h>
27 #include <linux/mm.h>
29 #include "aops.h"
30 #include "debug.h"
31 #include "endian.h"
32 #include "time.h"
33 #include "types.h"
34 #include "usnjrnl.h"
35 #include "volume.h"
37 /**
38 * ntfs_stamp_usnjrnl - stamp the transaction log ($UsnJrnl) on an ntfs volume
39 * @vol: ntfs volume on which to stamp the transaction log
41 * Stamp the transaction log ($UsnJrnl) on the ntfs volume @vol and return
42 * 'true' on success and 'false' on error.
44 * This function assumes that the transaction log has already been loaded and
45 * consistency checked by a call to fs/ntfs/super.c::load_and_init_usnjrnl().
47 bool ntfs_stamp_usnjrnl(ntfs_volume *vol)
49 ntfs_debug("Entering.");
50 if (likely(!NVolUsnJrnlStamped(vol))) {
51 sle64 stamp;
52 struct page *page;
53 USN_HEADER *uh;
55 page = ntfs_map_page(vol->usnjrnl_max_ino->i_mapping, 0);
56 if (IS_ERR(page)) {
57 ntfs_error(vol->sb, "Failed to read from "
58 "$UsnJrnl/$DATA/$Max attribute.");
59 return false;
61 uh = (USN_HEADER*)page_address(page);
62 stamp = get_current_ntfs_time();
63 ntfs_debug("Stamping transaction log ($UsnJrnl): old "
64 "journal_id 0x%llx, old lowest_valid_usn "
65 "0x%llx, new journal_id 0x%llx, new "
66 "lowest_valid_usn 0x%llx.",
67 (long long)sle64_to_cpu(uh->journal_id),
68 (long long)sle64_to_cpu(uh->lowest_valid_usn),
69 (long long)sle64_to_cpu(stamp),
70 i_size_read(vol->usnjrnl_j_ino));
71 uh->lowest_valid_usn =
72 cpu_to_sle64(i_size_read(vol->usnjrnl_j_ino));
73 uh->journal_id = stamp;
74 flush_dcache_page(page);
75 set_page_dirty(page);
76 ntfs_unmap_page(page);
77 /* Set the flag so we do not have to do it again on remount. */
78 NVolSetUsnJrnlStamped(vol);
80 ntfs_debug("Done.");
81 return true;
84 #endif /* NTFS_RW */