linux-kernel - [PATCH 20/20] isofs: Initialize filesystem timestamp ranges

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Message-Id: <20190730014924.2193-21-deepa.kernel@gmail.com>
Date:   Mon, 29 Jul 2019 18:49:24 -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
Subject: [PATCH 20/20] isofs: 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.

Reference: http://www.ecma-international.org/publications/standards/Ecma-119.htm

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
---
 fs/isofs/inode.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 9e30d8703735..62c0462dc89f 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -30,6 +30,9 @@
 #include "isofs.h"
 #include "zisofs.h"
 
+/* max tz offset is 13 hours */
+#define MAX_TZ_OFFSET (52*15*60)
+
 #define BEQUIET
 
 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
@@ -801,6 +804,10 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
 	 */
 	s->s_maxbytes = 0x80000000000LL;
 
+	/* ECMA-119 timestamp from 1900/1/1 with tz offset */
+	s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
+	s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
+
 	/* Set this for reference. Its not currently used except on write
 	   which we don't have .. */
 
-- 
2.17.1