[PATCH 01/19] vfs: Add inode uid,gid,mode initialization with helper function

[Dmitry Monakhov <dmonakhov@xxxxxxxxxx>]

Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
---
 fs/namei.c         |   19 +++++++++++++++++++
 include/linux/fs.h |    3 ++-
 2 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index d62fdc8..bbe9578 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1435,6 +1435,25 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
 		mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
 	}
 }
+/**
+ * Init uid,gid,mode for new inode according to posix standards
+ * @inode: New inode
+ * @dir: Directory inode
+ * @mode: mode of the new inode
+ */
+inline void inode_init_owner(struct inode *inode, const struct inode *dir,
+			int mode)
+{
+	inode->i_uid = current_fsuid();
+	if (dir && dir->i_mode & S_ISGID) {
+		inode->i_gid = dir->i_gid;
+		if (S_ISDIR(mode))
+			mode |= S_ISGID;
+	} else
+		inode->i_gid = current_fsgid();
+	inode->i_mode = mode;
+}
+EXPORT_SYMBOL(inode_init_owner);
 
 int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
 		struct nameidata *nd)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b1bcb27..b2d7cb3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1426,7 +1426,8 @@ extern void dentry_unhash(struct dentry *dentry);
  * VFS file helper functions.
  */
 extern int file_permission(struct file *, int);
-
+extern void inode_init_owner(struct inode *inode, const struct inode *dir,
+			int mode);
 /*
  * VFS FS_IOC_FIEMAP helper definitions.
  */
-- 
1.6.6

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