fs: add ctime accessors infrastructure

struct timespec64 has unused bits in the tv_nsec field that can be used
for other purposes. In future patches, we're going to change how the
inode->i_ctime is accessed in certain inodes in order to make use of
them. In order to do that safely though, we'll need to eradicate raw
accesses of the inode->i_ctime field from the kernel.

Add new accessor functions for the ctime that we use to replace them.

Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Message-Id: <20230705185812.579118-2-jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/inode.c b/fs/inode.c
index 8fefb69..aac5cdc 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -2502,6 +2502,22 @@ struct timespec64 current_time(struct inode *inode)
 EXPORT_SYMBOL(current_time);
 
 /**
+ * inode_set_ctime_current - set the ctime to current_time
+ * @inode: inode
+ *
+ * Set the inode->i_ctime to the current value for the inode. Returns
+ * the current value that was assigned to i_ctime.
+ */
+struct timespec64 inode_set_ctime_current(struct inode *inode)
+{
+       struct timespec64 now = current_time(inode);
+
+       inode_set_ctime(inode, now.tv_sec, now.tv_nsec);
+       return now;
+}
+EXPORT_SYMBOL(inode_set_ctime_current);
+
+/**
  * in_group_or_capable - check whether caller is CAP_FSETID privileged
  * @idmap:     idmap of the mount @inode was found from
  * @inode:     inode to check

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6867512..d41bfcb 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1474,7 +1474,50 @@ static inline bool fsuidgid_has_mapping(struct super_block *sb,
               kgid_has_mapping(fs_userns, kgid);
 }
 
-extern struct timespec64 current_time(struct inode *inode);
+struct timespec64 current_time(struct inode *inode);
+struct timespec64 inode_set_ctime_current(struct inode *inode);
+
+/**
+ * inode_get_ctime - fetch the current ctime from the inode
+ * @inode: inode from which to fetch ctime
+ *
+ * Grab the current ctime from the inode and return it.
+ */
+static inline struct timespec64 inode_get_ctime(const struct inode *inode)
+{
+       return inode->i_ctime;
+}
+
+/**
+ * inode_set_ctime_to_ts - set the ctime in the inode
+ * @inode: inode in which to set the ctime
+ * @ts: value to set in the ctime field
+ *
+ * Set the ctime in @inode to @ts
+ */
+static inline struct timespec64 inode_set_ctime_to_ts(struct inode *inode,
+                                                     struct timespec64 ts)
+{
+       inode->i_ctime = ts;
+       return ts;
+}
+
+/**
+ * inode_set_ctime - set the ctime in the inode
+ * @inode: inode in which to set the ctime
+ * @sec: tv_sec value to set
+ * @nsec: tv_nsec value to set
+ *
+ * Set the ctime in @inode to { @sec, @nsec }
+ */
+static inline struct timespec64 inode_set_ctime(struct inode *inode,
+                                               time64_t sec, long nsec)
+{
+       struct timespec64 ts = { .tv_sec  = sec,
+                                .tv_nsec = nsec };
+
+       return inode_set_ctime_to_ts(inode, ts);
+}
 
 /*
  * Snapshotting support.