linux-kernel - [PATCH 17/20] fs: hpfs: Initialize filesystem timestamp ranges

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Date:   Mon, 29 Jul 2019 18:49:21 -0700
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, arnd@...db.de,
        y2038@...ts.linaro.org, mikulas@...ax.karlin.mff.cuni.cz
Subject: [PATCH 17/20] fs: hpfs: Initialize filesystem timestamp ranges

Fill in the appropriate limits to avoid inconsistencies
in the vfs cached inode times when timestamps are
outside the permitted range.

Also change the local_to_gmt() to use time64_t instead
of time32_t.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Cc: mikulas@...ax.karlin.mff.cuni.cz
---
 fs/hpfs/hpfs_fn.h | 6 ++----
 fs/hpfs/super.c   | 2 ++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index ab2e7cc2ff33..1cca83218fb5 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -334,7 +334,7 @@ long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg);
  * local time (HPFS) to GMT (Unix)
  */
 
-static inline time64_t local_to_gmt(struct super_block *s, time32_t t)
+static inline time64_t local_to_gmt(struct super_block *s, time64_t t)
 {
 	extern struct timezone sys_tz;
 	return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
@@ -343,9 +343,7 @@ static inline time64_t local_to_gmt(struct super_block *s, time32_t t)
 static inline time32_t gmt_to_local(struct super_block *s, time64_t t)
 {
 	extern struct timezone sys_tz;
-	t = t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
-
-	return clamp_t(time64_t, t, 0, U32_MAX);
+	return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
 }
 
 static inline time32_t local_get_seconds(struct super_block *s)
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 9db6d84f0d62..0a677a9aaf34 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -614,6 +614,8 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
 	s->s_magic = HPFS_SUPER_MAGIC;
 	s->s_op = &hpfs_sops;
 	s->s_d_op = &hpfs_dentry_operations;
+	s->s_time_min =  local_to_gmt(s, 0);
+	s->s_time_max =  local_to_gmt(s, U32_MAX);
 
 	sbi->sb_root = le32_to_cpu(superblock->root);
 	sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
-- 
2.17.1