Set it to 1 ns, because we could be stacked on top of file systems with such
granularity.
Signed-off-by: Erez Zadok <[email protected]>
---
fs/unionfs/main.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/fs/unionfs/main.c b/fs/unionfs/main.c
index 92f0e9d..23c18f7 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 */
--
1.5.2.2
--
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