Btrfs: fix racy system chunk allocation when setting block group ro

[karo-tx-linux.git] / fs / stat.c

diff --git a/fs/stat.c b/fs/stat.c
index d0ea7ef75e264ef2cccf2c100d4e3a8c7393121c..ae0c3cef9927e64fb1f21ccf1848155825fc79ef 100644 (file)
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -37,14 +37,21 @@ void generic_fillattr(struct inode *inode, struct kstat *stat)
 
 EXPORT_SYMBOL(generic_fillattr);
 
-int vfs_getattr(struct path *path, struct kstat *stat)
+/**
+ * vfs_getattr_nosec - getattr without security checks
+ * @path: file to get attributes from
+ * @stat: structure to return attributes in
+ *
+ * Get attributes without calling security_inode_getattr.
+ *
+ * Currently the only caller other than vfs_getattr is internal to the
+ * filehandle lookup code, which uses only the inode number and returns
+ * no attributes to any user.  Any other code probably wants
+ * vfs_getattr.
+ */
+int vfs_getattr_nosec(struct path *path, struct kstat *stat)
 {
        struct inode *inode = path->dentry->d_inode;
-       int retval;
-
-       retval = security_inode_getattr(path->mnt, path->dentry);
-       if (retval)
-               return retval;
 
        if (inode->i_op->getattr)
                return inode->i_op->getattr(path->mnt, path->dentry, stat);
@@ -53,6 +60,18 @@ int vfs_getattr(struct path *path, struct kstat *stat)
        return 0;
 }
 
+EXPORT_SYMBOL(vfs_getattr_nosec);
+
+int vfs_getattr(struct path *path, struct kstat *stat)
+{
+       int retval;
+
+       retval = security_inode_getattr(path->mnt, path->dentry);
+       if (retval)
+               return retval;
+       return vfs_getattr_nosec(path, stat);
+}
+
 EXPORT_SYMBOL(vfs_getattr);
 
 int vfs_fstat(unsigned int fd, struct kstat *stat)