From fc611da1914e0e18db9a49d9ace1d12916cc1c8c Mon Sep 17 00:00:00 2001 From: Erez Zadok Date: Sat, 22 Dec 2007 19:43:03 -0500 Subject: [PATCH] Unionfs: set our superblock a/m/ctime granularity Set it to 1 ns, because we could be stacked on top of file systems with such granularity. Signed-off-by: Erez Zadok --- fs/unionfs/main.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/unionfs/main.c b/fs/unionfs/main.c index 92f0e9d5f91..23c18f7f911 100644 --- a/fs/unionfs/main.c +++ b/fs/unionfs/main.c @@ -642,6 +642,13 @@ static int unionfs_read_super(struct super_block *sb, void *raw_data, /* max Bytes is the maximum bytes from highest priority branch */ sb->s_maxbytes = unionfs_lower_super_idx(sb, 0)->s_maxbytes; + /* + * Our c/m/atime granularity is 1 ns because we may stack on file + * systems whose granularity is as good. This is important for our + * time-based cache coherency. + */ + sb->s_time_gran = 1; + sb->s_op = &unionfs_sops; /* See comment next to the definition of unionfs_d_alloc_root */ -- 2.43.0