[PATCH v2 1/2] fs: export an inode_update_time helper

[Josef Bacik <josef@toxicpanda.com>]

If you already have an inode and need to update the time on the inode
there is no way to do this properly.  Export this helper to allow file
systems to update time on the inode so the appropriate handler is
called, either ->update_time or generic_update_time.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/inode.c         | 7 ++++---
 include/linux/fs.h | 2 ++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index ed0cab8a32db..9abc88d7959c 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1782,12 +1782,13 @@ EXPORT_SYMBOL(generic_update_time);
  * This does the actual work of updating an inodes time or version.  Must have
  * had called mnt_want_write() before calling this.
  */
-static int update_time(struct inode *inode, struct timespec64 *time, int flags)
+int inode_update_time(struct inode *inode, struct timespec64 *time, int flags)
 {
 	if (inode->i_op->update_time)
 		return inode->i_op->update_time(inode, time, flags);
 	return generic_update_time(inode, time, flags);
 }
+EXPORT_SYMBOL(inode_update_time);
 
 /**
  *	atime_needs_update	-	update the access time
@@ -1857,7 +1858,7 @@ void touch_atime(const struct path *path)
 	 * of the fs read only, e.g. subvolumes in Btrfs.
 	 */
 	now = current_time(inode);
-	update_time(inode, &now, S_ATIME);
+	inode_update_time(inode, &now, S_ATIME);
 	__mnt_drop_write(mnt);
 skip_update:
 	sb_end_write(inode->i_sb);
@@ -2002,7 +2003,7 @@ int file_update_time(struct file *file)
 	if (__mnt_want_write_file(file))
 		return 0;
 
-	ret = update_time(inode, &now, sync_it);
+	ret = inode_update_time(inode, &now, sync_it);
 	__mnt_drop_write_file(file);
 
 	return ret;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index e7a633353fd2..20e2fe398ab6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2498,6 +2498,8 @@ enum file_time_flags {
 
 extern bool atime_needs_update(const struct path *, struct inode *);
 extern void touch_atime(const struct path *);
+extern int inode_update_time(struct inode *inode, struct timespec64 *time,
+			     int flags);
 static inline void file_accessed(struct file *file)
 {
 	if (!(file->f_flags & O_NOATIME))
-- 
2.26.3