UPSTREAM: of/pci: Add helper function to parse max-link-speed from dt

[firefly-linux-kernel-4.4.55.git] / fs / attr.c

diff --git a/fs/attr.c b/fs/attr.c
index 1449adb14ef6a468b3d97865499df941a2c28312..d62f674a605ff687972507ffce003bc08121b81d 100644 (file)
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -50,14 +50,14 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr)
        if ((ia_valid & ATTR_UID) &&
            (!uid_eq(current_fsuid(), inode->i_uid) ||
             !uid_eq(attr->ia_uid, inode->i_uid)) &&
-           !inode_capable(inode, CAP_CHOWN))
+           !capable_wrt_inode_uidgid(inode, CAP_CHOWN))
                return -EPERM;
 
        /* Make sure caller can chgrp. */
        if ((ia_valid & ATTR_GID) &&
            (!uid_eq(current_fsuid(), inode->i_uid) ||
            (!in_group_p(attr->ia_gid) && !gid_eq(attr->ia_gid, inode->i_gid))) &&
-           !inode_capable(inode, CAP_CHOWN))
+           !capable_wrt_inode_uidgid(inode, CAP_CHOWN))
                return -EPERM;
 
        /* Make sure a caller can chmod. */
@@ -67,7 +67,7 @@ int inode_change_ok(const struct inode *inode, struct iattr *attr)
                /* Also check the setgid bit! */
                if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
                                inode->i_gid) &&
-                   !inode_capable(inode, CAP_FSETID))
+                   !capable_wrt_inode_uidgid(inode, CAP_FSETID))
                        attr->ia_mode &= ~S_ISGID;
        }
 
@@ -160,14 +160,34 @@ void setattr_copy(struct inode *inode, const struct iattr *attr)
                umode_t mode = attr->ia_mode;
 
                if (!in_group_p(inode->i_gid) &&
-                   !inode_capable(inode, CAP_FSETID))
+                   !capable_wrt_inode_uidgid(inode, CAP_FSETID))
                        mode &= ~S_ISGID;
                inode->i_mode = mode;
        }
 }
 EXPORT_SYMBOL(setattr_copy);
 
-int notify_change(struct dentry * dentry, struct iattr * attr)
+/**
+ * notify_change - modify attributes of a filesytem object
+ * @dentry:    object affected
+ * @iattr:     new attributes
+ * @delegated_inode: returns inode, if the inode is delegated
+ *
+ * The caller must hold the i_mutex on the affected object.
+ *
+ * If notify_change discovers a delegation in need of breaking,
+ * it will return -EWOULDBLOCK and return a reference to the inode in
+ * delegated_inode.  The caller should then break the delegation and
+ * retry.  Because breaking a delegation may take a long time, the
+ * caller should drop the i_mutex before doing so.
+ *
+ * Alternatively, a caller may pass NULL for delegated_inode.  This may
+ * be appropriate for callers that expect the underlying filesystem not
+ * to be NFS exported.  Also, passing NULL is fine for callers holding
+ * the file open for write, as there can be no conflicting delegation in
+ * that case.
+ */
+int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **delegated_inode)
 {
        struct inode *inode = dentry->d_inode;
        umode_t mode = inode->i_mode;
@@ -182,9 +202,19 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
                        return -EPERM;
        }
 
-       if ((ia_valid & ATTR_SIZE) && IS_I_VERSION(inode)) {
-               if (attr->ia_size != inode->i_size)
-                       inode_inc_iversion(inode);
+       /*
+        * If utimes(2) and friends are called with times == NULL (or both
+        * times are UTIME_NOW), then we need to check for write permission
+        */
+       if (ia_valid & ATTR_TOUCH) {
+               if (IS_IMMUTABLE(inode))
+                       return -EPERM;
+
+               if (!inode_owner_or_capable(inode)) {
+                       error = inode_permission(inode, MAY_WRITE);
+                       if (error)
+                               return error;
+               }
        }
 
        if ((ia_valid & ATTR_MODE)) {
@@ -241,6 +271,9 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
                return 0;
 
        error = security_inode_setattr(dentry, attr);
+       if (error)
+               return error;
+       error = try_break_deleg(inode, delegated_inode);
        if (error)
                return error;