f2fs: Replace CURRENT_TIME_SEC with current_time() for inode timestamps

commit 02027d42c3f747945f19111d3da2092ed2148ac8 upstream.

This is for backport only.

fs: Replace CURRENT_TIME_SEC with current_time() for inode timestamps

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/dir.c

@@ -312,7 +312,7 @@ void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
 	f2fs_dentry_kunmap(dir, page);
 	set_page_dirty(page);
 
-	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+	dir->i_mtime = dir->i_ctime = current_time(dir);
 	f2fs_mark_inode_dirty_sync(dir);
 	f2fs_put_page(page, 1);
 }
@@ -465,7 +465,7 @@ void update_parent_metadata(struct inode *dir, struct inode *inode,
 			f2fs_i_links_write(dir, true);
 		clear_inode_flag(inode, FI_NEW_INODE);
 	}
-	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+	dir->i_mtime = dir->i_ctime = current_time(dir);
 	f2fs_mark_inode_dirty_sync(dir);
 
 	if (F2FS_I(dir)->i_current_depth != current_depth)
@@ -683,7 +683,7 @@ void f2fs_drop_nlink(struct inode *dir, struct inode *inode)
 
 	if (S_ISDIR(inode->i_mode))
 		f2fs_i_links_write(dir, false);
-	inode->i_ctime = CURRENT_TIME;
+	inode->i_ctime = current_time(inode);
 
 	f2fs_i_links_write(inode, false);
 	if (S_ISDIR(inode->i_mode)) {
@@ -730,7 +730,7 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
 	kunmap(page); /* kunmap - pair of f2fs_find_entry */
 	set_page_dirty(page);
 
-	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+	dir->i_ctime = dir->i_mtime = current_time(dir);
 	f2fs_mark_inode_dirty_sync(dir);
 
 	if (inode)

fs/f2fs/f2fs.h

@@ -138,6 +138,28 @@ static inline void inode_nohighmem(struct inode *inode)
 	mapping_set_gfp_mask(inode->i_mapping, GFP_USER);
 }
 
+/**
+ * current_time - Return FS time
+ * @inode: inode.
+ *
+ * Return the current time truncated to the time granularity supported by
+ * the fs.
+ *
+ * Note that inode and inode->sb cannot be NULL.
+ * Otherwise, the function warns and returns time without truncation.
+ */
+static inline struct timespec current_time(struct inode *inode)
+{
+	struct timespec now = current_kernel_time();
+
+	if (unlikely(!inode->i_sb)) {
+		WARN(1, "current_time() called with uninitialized super_block in the inode");
+		return now; 
+	}    
+
+	return timespec_trunc(now, inode->i_sb->s_time_gran);
+}
+
 /*
  * For checkpoint manager
  */

fs/f2fs/file.c

@@ -632,7 +632,7 @@ int f2fs_truncate(struct inode *inode)
 	if (err)
 		return err;
 
-	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	inode->i_mtime = inode->i_ctime = current_time(inode);
 	f2fs_mark_inode_dirty_sync(inode);
 	return 0;
 }
@@ -708,7 +708,7 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 				if (err)
 					return err;
 			}
-			inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+			inode->i_mtime = inode->i_ctime = current_time(inode);
 		}
 	}
 
@@ -1402,7 +1402,7 @@ static long f2fs_fallocate(struct file *file, int mode,
 	}
 
 	if (!ret) {
-		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+		inode->i_mtime = inode->i_ctime = current_time(inode);
 		f2fs_mark_inode_dirty_sync(inode);
 		f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
 	}
@@ -1494,7 +1494,7 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
 	fi->i_flags = flags;
 	inode_unlock(inode);
 
-	inode->i_ctime = CURRENT_TIME;
+	inode->i_ctime = current_time(inode);
 	f2fs_set_inode_flags(inode);
 out:
 	mnt_drop_write_file(filp);

fs/f2fs/inline.c

@@ -591,7 +591,7 @@ void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
 	set_page_dirty(page);
 	f2fs_put_page(page, 1);
 
-	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+	dir->i_ctime = dir->i_mtime = current_time(dir);
 	f2fs_mark_inode_dirty_sync(dir);
 
 	if (inode)

fs/f2fs/namei.c

@@ -46,7 +46,7 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
 
 	inode->i_ino = ino;
 	inode->i_blocks = 0;
-	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 	inode->i_generation = sbi->s_next_generation++;
 
 	err = insert_inode_locked(inode);
@@ -182,7 +182,7 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 
 	f2fs_balance_fs(sbi, true);
 
-	inode->i_ctime = CURRENT_TIME;
+	inode->i_ctime = current_time(inode);
 	ihold(inode);
 
 	set_inode_flag(inode, FI_INC_LINK);
@@ -720,7 +720,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 		f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 
-		new_inode->i_ctime = CURRENT_TIME;
+		new_inode->i_ctime = current_time(new_inode);
 		down_write(&F2FS_I(new_inode)->i_sem);
 		if (old_dir_entry)
 			f2fs_i_links_write(new_inode, false);
@@ -774,7 +774,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		file_set_enc_name(old_inode);
 	up_write(&F2FS_I(old_inode)->i_sem);
 
-	old_inode->i_ctime = CURRENT_TIME;
+	old_inode->i_ctime = current_time(old_inode);
 	f2fs_mark_inode_dirty_sync(old_inode);
 
 	f2fs_delete_entry(old_entry, old_page, old_dir, NULL);

fs/f2fs/xattr.c

@@ -588,7 +588,7 @@ static int __f2fs_setxattr(struct inode *inode, int index,
 
 	if (is_inode_flag_set(inode, FI_ACL_MODE)) {
 		inode->i_mode = F2FS_I(inode)->i_acl_mode;
-		inode->i_ctime = CURRENT_TIME;
+		inode->i_ctime = current_time(inode);
 		clear_inode_flag(inode, FI_ACL_MODE);
 	}
 	if (index == F2FS_XATTR_INDEX_ENCRYPTION &&