linux-kernel - [PATCH 07/20] 9p: Fill min and max timestamps in sb

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Date:   Mon, 29 Jul 2019 18:49:11 -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, ericvh@...il.com, lucho@...kov.net,
        asmadeus@...ewreck.org, v9fs-developer@...ts.sourceforge.net
Subject: [PATCH 07/20] 9p: Fill min and max timestamps in sb

struct p9_wstat and struct p9_stat_dotl indicate that the
wire transport uses u32 and u64 fields for timestamps.
Fill in the appropriate limits to avoid inconsistencies in
the vfs cached inode times when timestamps are outside the
permitted range.

Note that the upper bound for V9FS_PROTO_2000L is retained as S64_MAX.
This is because that is the upper bound supported by vfs.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Cc: ericvh@...il.com
Cc: lucho@...kov.net
Cc: asmadeus@...ewreck.org
Cc: v9fs-developer@...ts.sourceforge.net
---
 fs/9p/vfs_super.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 08112fbcaece..ca243e658d71 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -69,8 +69,12 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
 	if (v9fs_proto_dotl(v9ses)) {
 		sb->s_op = &v9fs_super_ops_dotl;
 		sb->s_xattr = v9fs_xattr_handlers;
-	} else
+	} else {
 		sb->s_op = &v9fs_super_ops;
+		sb->s_time_max = U32_MAX;
+	}
+
+	sb->s_time_min = 0;
 
 	ret = super_setup_bdi(sb);
 	if (ret)
-- 
2.17.1