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authorOleksij Rempel <bug-track@fisher-privat.net>2013-02-27 17:03:09 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:11 -0800
commitb88a105802e9aeb6e234e8106659f5d1271081bb (patch)
tree589342d16e494deeb20da933fe409088e59b04d8 /include/uapi/linux/msdos_fs.h
parent6b46419b0462ae565880f02e9cd0baf9b25ea71f (diff)
fat: mark fs as dirty on mount and clean on umount
There is no documented methods to mark FAT as dirty. Unofficially MS started to use reserved Byte in boot sector for this purpose, at least since Win 2000. With Win 7 user is warned if fs is dirty and asked to clean it. Different versions of Win, handle it in different ways, but always have same meaning: - Win 2000 and XP, set it on write operations and remove it after operation was finnished - Win 7, set dirty flag on first write and remove it on umount. We will do it as follows: - set dirty flag on mount. If fs was initially dirty, warn user, remember it and do not do any changes to boot sector. - clean it on umount. If fs was initially dirty, leave it dirty. - do not do any thing if fs mounted read-only. - TODO: leave fs dirty if we found some error after mount. Signed-off-by: Oleksij Rempel <bug-track@fisher-privat.net> Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/uapi/linux/msdos_fs.h')
-rw-r--r--include/uapi/linux/msdos_fs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/msdos_fs.h b/include/uapi/linux/msdos_fs.h
index b9f12450efe8..f055e58b3147 100644
--- a/include/uapi/linux/msdos_fs.h
+++ b/include/uapi/linux/msdos_fs.h
@@ -87,6 +87,8 @@
#define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
&& le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)
+#define FAT_STATE_DIRTY 0x01
+
struct __fat_dirent {
long d_ino;
__kernel_off_t d_off;