[PATCH v2 01/24] vfs: Add current_time() api

[Deepa Dinamani]

current_fs_time() is used for inode timestamps.

Change the signature of the function to take inode pointer
instead of superblock as per Linus's suggestion.

Also, move the api under vfs as per the discussion on the
thread: https://lkml.org/lkml/2016/6/9/36 . As per Arnd's
suggestion on the thread, changing the function name.

current_fs_time() will be deleted after all the references
to it are replaced by current_time().

Note that timespec_trunc() will also be moved to fs/inode.c
in a separate patch when this will need to be revamped for
bounds checking purposes.

Signed-off-by: Deepa Dinamani <deepa.kernel@xxxxxxxxx>
---
 fs/inode.c         | 15 +++++++++++++++
 include/linux/fs.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/fs/inode.c b/fs/inode.c
index 4ccbc21..75c98cc 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2041,3 +2041,18 @@ void inode_nohighmem(struct inode *inode)
 	mapping_set_gfp_mask(inode->i_mapping, GFP_USER);
 }
 EXPORT_SYMBOL(inode_nohighmem);
+
+/**
+ * current_time - Return FS time
+ * @inode: inode.
+ *
+ * Return the current time truncated to the time granularity supported by
+ * the fs.
+ */
+struct timespec current_time(struct inode *inode)
+{
+	struct timespec now = current_kernel_time();
+
+	return timespec_trunc(now, inode->i_sb->s_time_gran);
+}
+EXPORT_SYMBOL(current_time);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index dcd087e..21a8afe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1461,6 +1461,7 @@ struct super_block {
 };
 
 extern struct timespec current_fs_time(struct super_block *sb);
+extern struct timespec current_time(struct inode *inode);
 
 static inline struct timespec current_fs_time_sec(struct super_block *sb)
 {
-- 
1.9.1