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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-04-27 13:48:18 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-05-01 15:42:43 -0400
commit3a1556e8662cc425c433b463fcdae138908ca467 (patch)
treec4c16f7e33612c3ce3b504e9eedbf336d0c4bf20 /fs/nfs/internal.h
parent6a4506c0b56889aaa15bcf50b3c75f46a8d0a3bd (diff)
NFSv2/v3: Simulate the change attribute
Use the ctime to simulate a change attribute for NFSv2 and NFSv3. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/internal.h')
-rw-r--r--fs/nfs/internal.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 0fd1efaf1cf..1855e8fea42 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -493,3 +493,15 @@ unsigned int nfs_page_array_len(unsigned int base, size_t len)
PAGE_SIZE - 1) >> PAGE_SHIFT;
}
+/*
+ * Convert a struct timespec into a 64-bit change attribute
+ *
+ * This does approximately the same thing as timespec_to_ns(),
+ * but for calculation efficiency, we multiply the seconds by
+ * 1024*1024*1024.
+ */
+static inline
+u64 nfs_timespec_to_change_attr(const struct timespec *ts)
+{
+ return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
+}