diff -Nru dosfstools-3.0.12/debian/changelog dosfstools-3.0.12/debian/changelog
--- dosfstools-3.0.12/debian/changelog	2013-01-18 13:08:46.000000000 +0000
+++ dosfstools-3.0.12/debian/changelog	2015-04-07 10:20:35.000000000 +0000
@@ -1,3 +1,11 @@
+dosfstools (3.0.12-1ubuntu1.2) precise; urgency=medium
+
+  * Add git-check-dirty-bit.patch: Check boot sector for dirty bit, to allow
+    dosfsck to repair partitions which didn't get unmounted properly.
+    (LP: #1322976)
+
+ -- Martin Pitt <martin.pitt@ubuntu.com>  Tue, 07 Apr 2015 12:19:39 +0200
+
 dosfstools (3.0.12-1ubuntu1.1) precise; urgency=low
 
   * Add dosfstools-udeb package, mainly so that we can use mkdosfs in d-i
diff -Nru dosfstools-3.0.12/debian/patches/git-check-dirty-bit.patch dosfstools-3.0.12/debian/patches/git-check-dirty-bit.patch
--- dosfstools-3.0.12/debian/patches/git-check-dirty-bit.patch	1970-01-01 00:00:00.000000000 +0000
+++ dosfstools-3.0.12/debian/patches/git-check-dirty-bit.patch	2015-04-07 10:19:00.000000000 +0000
@@ -0,0 +1,98 @@
+From ce2f8dc349a8a6b2c26d1b3892cc9b5f0408bd34 Mon Sep 17 00:00:00 2001
+From: Oleksij Rempel <bug-track@fisher-privat.net>
+Date: Wed, 23 Jan 2013 12:35:13 +0100
+Subject: [PATCH] Checking boot sector for dirty bit.
+
+Some OSos use reseved byte of boot sector to set state of the file
+system. If first bit set, then filesystem is proably damaged - write
+operation was not finished/cache not snycted/...
+
+Signed-off-by: Oleksij Rempel <bug-track@fisher-privat.net>
+Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
+---
+ src/boot.c    | 41 +++++++++++++++++++++++++++++++++++++++++
+ src/dosfsck.h |  2 ++
+ 2 files changed, 43 insertions(+)
+
+diff --git a/src/boot.c b/src/boot.c
+index 3d6b4e4..55d5875 100644
+--- a/src/boot.c
++++ b/src/boot.c
+@@ -291,6 +291,45 @@ static void read_fsinfo(DOS_FS * fs, struct boot_sector *b, int lss)
+ 	fs->free_clusters = CF_LE_L(i.free_clusters);
+ }
+ 
++static char print_fat_dirty_state(void)
++{
++    printf("Dirty bit is set. Fs was not properly unmounted and"
++           " some data may be corrupt.\n");
++
++    if (interactive) {
++        printf("1) Remove dirty bit\n"
++               "2) No action\n");
++        return get_key("12", "?");
++    } else
++        printf(" Automaticaly removing dirty bit.\n");
++    return '1';
++}
++
++static void check_fat_state_bit (DOS_FS *fs, void *b)
++{
++    if (fs->fat_bits == 32) {
++        struct boot_sector *b32 = b;
++
++        if (b32->reserved3 & FAT_STATE_DIRTY) {
++            printf("0x41: ");
++            if (print_fat_dirty_state() == '1') {
++                b32->reserved3 &= ~FAT_STATE_DIRTY;
++                fs_write(0, sizeof(*b32), b32);
++            }
++        }
++    } else {
++        struct boot_sector_16 *b16 = b;
++
++        if (b16->reserved2 & FAT_STATE_DIRTY) {
++            printf("0x25: ");
++            if (print_fat_dirty_state() == '1') {
++                b16->reserved2 &= ~FAT_STATE_DIRTY;
++                fs_write(0, sizeof(*b16), b16);
++            }
++        }
++    }
++}
++
+ void read_boot(DOS_FS * fs)
+ {
+     struct boot_sector b;
+@@ -363,6 +402,7 @@ void read_boot(DOS_FS * fs)
+ 		   "  This may lead to problems on some systems.\n",
+ 		   fs->clusters, FAT16_THRESHOLD);
+ 
++	check_fat_state_bit(fs, &b);
+ 	fs->backupboot_start = CF_LE_W(b.backup_boot) * logical_sector_size;
+ 	check_backup_boot(fs, &b, logical_sector_size);
+ 
+@@ -373,6 +413,7 @@ void read_boot(DOS_FS * fs)
+ 	fs->fat_bits = (fs->clusters >= FAT12_THRESHOLD) ? 16 : 12;
+ 	if (fs->clusters >= FAT16_THRESHOLD)
+ 	    die("Too many clusters (%lu) for FAT16 filesystem.", fs->clusters);
++	check_fat_state_bit(fs, &b);
+     } else {
+ 	/* On Atari, things are more difficult: GEMDOS always uses 12bit FATs
+ 	 * on floppies, and always 16 bit on harddisks. */
+diff --git a/src/dosfsck.h b/src/dosfsck.h
+index 6eb42fb..9fe103a 100644
+--- a/src/dosfsck.h
++++ b/src/dosfsck.h
+@@ -57,6 +57,8 @@
+ 
+ #define VFAT_LN_ATTR (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
+ 
++#define FAT_STATE_DIRTY 0x01
++
+ /* ++roman: Use own definition of boot sector structure -- the kernel headers'
+  * name for it is msdos_boot_sector in 2.0 and fat_boot_sector in 2.1 ... */
+ struct boot_sector {
+-- 
+1.8.2.1
+
diff -Nru dosfstools-3.0.12/debian/patches/series dosfstools-3.0.12/debian/patches/series
--- dosfstools-3.0.12/debian/patches/series	2011-12-19 23:24:17.000000000 +0000
+++ dosfstools-3.0.12/debian/patches/series	2015-04-07 10:19:31.000000000 +0000
@@ -1 +1,2 @@
+git-check-dirty-bit.patch
 02_fat32_label.patch