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authorArnd Bergmann <arnd@arndb.de>2018-08-18 01:43:47 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-18 02:20:27 +0300
commita3fda0ffeaf0114328024aee4a9ec3b08af4b077 (patch)
tree4a8bb141028225eebeeedd329c4c1b01f6e0edc5 /fs/ufs/util.h
parent2c1bb29aa6e7b0e52d84bd06bc199b0a5076a781 (diff)
downloadlinux-a3fda0ffeaf0114328024aee4a9ec3b08af4b077.tar.xz
fs/ufs: use ktime_get_real_seconds for sb and cg timestamps
get_seconds() is deprecated because of the 32-bit overflow and will be removed. All callers in ufs also truncate to a 32-bit number, so nothing changes during the conversion, but this should be harmless as the superblock and cylinder group timestamps are not visible to user space, except for checking the fs-dirty state, wich works fine across the overflow. This moves the call to get_seconds() into a new inline function, with a comment explaining the constraints, while converting it to ktime_get_real_seconds(). Link: http://lkml.kernel.org/r/20180718115017.742609-1-arnd@arndb.de Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ufs/util.h')
-rw-r--r--fs/ufs/util.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/ufs/util.h b/fs/ufs/util.h
index 1907be6d5808..1fd3011ea623 100644
--- a/fs/ufs/util.h
+++ b/fs/ufs/util.h
@@ -590,3 +590,17 @@ static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi,
else
return *(__fs32 *)p == 0;
}
+
+static inline __fs32 ufs_get_seconds(struct super_block *sbp)
+{
+ time64_t now = ktime_get_real_seconds();
+
+ /* Signed 32-bit interpretation wraps around in 2038, which
+ * happens in ufs1 inode stamps but not ufs2 using 64-bits
+ * stamps. For superblock and blockgroup, let's assume
+ * unsigned 32-bit stamps, which are good until y2106.
+ * Wrap around rather than clamp here to make the dirty
+ * file system detection work in the superblock stamp.
+ */
+ return cpu_to_fs32(sbp, lower_32_bits(now));
+}