orangefs: reorganize setattr functions to track attribute changes

OrangeFS accepts a mask indicating which attributes were changed. The
kernel must not set any bits except those that were actually changed.
The kernel must set the uid/gid of the request to the actual uid/gid
responsible for the change.

Code path for notify_change initiated setattrs is

orangefs_setattr(dentry, iattr)
-> __orangefs_setattr(inode, iattr)

In kernel changes are initiated by calling __orangefs_setattr.

Code path for writeback is

orangefs_write_inode
-> orangefs_inode_setattr

attr_valid and attr_uid and attr_gid change together under i_lock.
I_DIRTY changes separately.

__orangefs_setattr
lock
if needs to be cleaned first, unlock and retry
set attr_valid
copy data in
unlock
mark_inode_dirty

orangefs_inode_setattr
lock
copy attributes out
unlock
clear getattr_time
# __writeback_single_inode clears dirty

orangefs_inode_getattr
# possible to get here with attr_valid set and not dirty
lock
if getattr_time ok or attr_valid set, unlock and return
unlock
do server operation
# another thread may getattr or setattr, so check for that
lock
if getattr_time ok or attr_valid, unlock and return
else, copy in
update getattr_time
unlock

Signed-off-by: Martin Brandenburg <[e-mail]>
Signed-off-by: Mike Marshall <[e-mail]>

fs/orangefs/acl.c

···
 			rc = __orangefs_set_acl(inode, acl, type);
 		} else {
 			iattr.ia_valid = ATTR_MODE;
-			rc = orangefs_inode_setattr(inode, &iattr);
+			rc = __orangefs_setattr(inode, &iattr);
 		}
 
 		return rc;
···
 		inode->i_mode = mode;
 		iattr.ia_mode = mode;
 		iattr.ia_valid |= ATTR_MODE;
-		orangefs_inode_setattr(inode, &iattr);
+		__orangefs_setattr(inode, &iattr);
 	}
 
 	return error;

fs/orangefs/inode.c

···
 // SPDX-License-Identifier: GPL-2.0
 /*
  * (C) 2001 Clemson University and The University of Chicago
+ * Copyright 2018 Omnibond Systems, L.L.C.
  *
  * See COPYING in top-level directory.
  */
···
 	return ret;
 }
 
-/*
- * Change attributes of an object referenced by dentry.
- */
-int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
+int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
 {
-	struct inode *inode = dentry->d_inode;
 	int ret;
 
-	gossip_debug(GOSSIP_INODE_DEBUG,
-		"%s: called on %pd\n",
-		__func__,
-		dentry);
-
-	ret = setattr_prepare(dentry, iattr);
-	if (ret)
-		goto out;
+	if (iattr->ia_valid & ATTR_MODE) {
+		if (iattr->ia_mode & (S_ISVTX)) {
+			if (is_root_handle(inode)) {
+				/*
+				 * allow sticky bit to be set on root (since
+				 * it shows up that way by default anyhow),
+				 * but don't show it to the server
+				 */
+				iattr->ia_mode -= S_ISVTX;
+			} else {
+				gossip_debug(GOSSIP_UTILS_DEBUG,
+					     "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
+				return -EINVAL;
+			}
+		}
+		if (iattr->ia_mode & (S_ISUID)) {
+			gossip_debug(GOSSIP_UTILS_DEBUG,
+				     "Attempting to set setuid bit (not supported); returning EINVAL.\n");
+			return -EINVAL;
+		}
+	}
 
 	if (iattr->ia_valid & ATTR_SIZE) {
 		ret = orangefs_setattr_size(inode, iattr);
···
 			goto out;
 	}
 
+again:
+	spin_lock(&inode->i_lock);
+	if (ORANGEFS_I(inode)->attr_valid) {
+		if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
+		    gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
+			ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
+		} else {
+			spin_unlock(&inode->i_lock);
+			write_inode_now(inode, 1);
+			goto again;
+		}
+	} else {
+		ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
+		ORANGEFS_I(inode)->attr_uid = current_fsuid();
+		ORANGEFS_I(inode)->attr_gid = current_fsgid();
+	}
 	setattr_copy(inode, iattr);
+	spin_unlock(&inode->i_lock);
 	mark_inode_dirty(inode);
 
 	if (iattr->ia_valid & ATTR_MODE)
···
 
 	ret = 0;
 out:
-	gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
+	return ret;
+}
+
+/*
+ * Change attributes of an object referenced by dentry.
+ */
+int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+	int ret;
+	gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
+	    dentry);
+	ret = setattr_prepare(dentry, iattr);
+	if (ret)
+	        goto out;
+	ret = __orangefs_setattr(d_inode(dentry), iattr);
+	sync_inode_metadata(d_inode(dentry), 1);
+out:
+	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
+	    ret);
 	return ret;
 }
 
···
 		iattr.ia_valid |= ATTR_CTIME;
 	if (flags & S_MTIME)
 		iattr.ia_valid |= ATTR_MTIME;
-	return orangefs_inode_setattr(inode, &iattr);
+	return __orangefs_setattr(inode, &iattr);
 }
 
 /* ORANGEFS2 implementation of VFS inode operations for files */
···
 	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
 	ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
 	ORANGEFS_I(inode)->refn.khandle = ref->khandle;
+	ORANGEFS_I(inode)->attr_valid = 0;
 	hash_init(ORANGEFS_I(inode)->xattr_cache);
 	return 0;
 }

fs/orangefs/namei.c

···
 		     __func__,
 		     dentry);
 
-	dir->i_mtime = dir->i_ctime = current_time(dir);
 	memset(&iattr, 0, sizeof iattr);
-	iattr.ia_valid |= ATTR_MTIME;
-	orangefs_inode_setattr(dir, &iattr);
-	mark_inode_dirty_sync(dir);
+	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
+	iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
+	__orangefs_setattr(dir, &iattr);
 	ret = 0;
 out:
 	op_release(new_op);
···
 	if (!ret) {
 		drop_nlink(inode);
 
-		dir->i_mtime = dir->i_ctime = current_time(dir);
 		memset(&iattr, 0, sizeof iattr);
-		iattr.ia_valid |= ATTR_MTIME;
-		orangefs_inode_setattr(dir, &iattr);
-		mark_inode_dirty_sync(dir);
+		iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
+		iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
+		__orangefs_setattr(dir, &iattr);
 	}
 	return ret;
 }
···
 		     get_khandle_from_ino(inode),
 		     dentry);
 
-	dir->i_mtime = dir->i_ctime = current_time(dir);
 	memset(&iattr, 0, sizeof iattr);
-	iattr.ia_valid |= ATTR_MTIME;
-	orangefs_inode_setattr(dir, &iattr);
-	mark_inode_dirty_sync(dir);
+	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
+	iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
+	__orangefs_setattr(dir, &iattr);
 	ret = 0;
 out:
 	op_release(new_op);
···
 	 * NOTE: we have no good way to keep nlink consistent for directories
 	 * across clients; keep constant at 1.
 	 */
-	dir->i_mtime = dir->i_ctime = current_time(dir);
 	memset(&iattr, 0, sizeof iattr);
-	iattr.ia_valid |= ATTR_MTIME;
-	orangefs_inode_setattr(dir, &iattr);
-	mark_inode_dirty_sync(dir);
+	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
+	iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
+	__orangefs_setattr(dir, &iattr);
 out:
 	op_release(new_op);
 	return ret;
···
 		     "orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
 		     old_dentry, new_dentry, d_count(new_dentry));
 
-	new_dir->i_mtime = new_dir->i_ctime = current_time(new_dir);
 	memset(&iattr, 0, sizeof iattr);
-	iattr.ia_valid |= ATTR_MTIME;
-	orangefs_inode_setattr(new_dir, &iattr);
-	mark_inode_dirty_sync(new_dir);
+	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
+	iattr.ia_mtime = iattr.ia_ctime = current_time(new_dir);
+	__orangefs_setattr(new_dir, &iattr);
 
 	new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
 	if (!new_op)

fs/orangefs/orangefs-kernel.h

···
 	sector_t last_failed_block_index_read;
 
 	unsigned long getattr_time;
+	int attr_valid;
+	kuid_t attr_uid;
+	kgid_t attr_gid;
 
 	DECLARE_HASHTABLE(xattr_cache, 4);
 };
···
 			      dev_t dev,
 			      struct orangefs_object_kref *ref);
 
-int orangefs_setattr(struct dentry *dentry, struct iattr *iattr);
+int __orangefs_setattr(struct inode *, struct iattr *);
+int orangefs_setattr(struct dentry *, struct iattr *);
 
 int orangefs_getattr(const struct path *path, struct kstat *stat,
 		     u32 request_mask, unsigned int flags);
···
 
 int orangefs_inode_check_changed(struct inode *inode);
 
-int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr);
+int orangefs_inode_setattr(struct inode *inode);
 
 bool orangefs_cancel_op_in_progress(struct orangefs_kernel_op_s *op);
 

fs/orangefs/orangefs-utils.c

···
  * NOTE: in kernel land, we never use the sys_attr->link_target for
  * anything, so don't bother copying it into the sys_attr object here.
  */
-static inline int copy_attributes_from_inode(struct inode *inode,
-					     struct ORANGEFS_sys_attr_s *attrs,
-					     struct iattr *iattr)
+static inline void copy_attributes_from_inode(struct inode *inode,
+    struct ORANGEFS_sys_attr_s *attrs)
 {
-	umode_t tmp_mode;
-
-	if (!iattr || !inode || !attrs) {
-		gossip_err("NULL iattr (%p), inode (%p), attrs (%p) "
-			   "in copy_attributes_from_inode!\n",
-			   iattr,
-			   inode,
-			   attrs);
-		return -EINVAL;
-	}
-	/*
-	 * We need to be careful to only copy the attributes out of the
-	 * iattr object that we know are valid.
-	 */
+	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	attrs->mask = 0;
-	if (iattr->ia_valid & ATTR_UID) {
-		attrs->owner = from_kuid(&init_user_ns, iattr->ia_uid);
+	if (orangefs_inode->attr_valid & ATTR_UID) {
+		attrs->owner = from_kuid(&init_user_ns, inode->i_uid);
 		attrs->mask |= ORANGEFS_ATTR_SYS_UID;
 		gossip_debug(GOSSIP_UTILS_DEBUG, "(UID) %d\n", attrs->owner);
 	}
-	if (iattr->ia_valid & ATTR_GID) {
-		attrs->group = from_kgid(&init_user_ns, iattr->ia_gid);
+	if (orangefs_inode->attr_valid & ATTR_GID) {
+		attrs->group = from_kgid(&init_user_ns, inode->i_gid);
 		attrs->mask |= ORANGEFS_ATTR_SYS_GID;
 		gossip_debug(GOSSIP_UTILS_DEBUG, "(GID) %d\n", attrs->group);
 	}
 
-	if (iattr->ia_valid & ATTR_ATIME) {
+	if (orangefs_inode->attr_valid & ATTR_ATIME) {
 		attrs->mask |= ORANGEFS_ATTR_SYS_ATIME;
-		if (iattr->ia_valid & ATTR_ATIME_SET) {
-			attrs->atime = (time64_t)iattr->ia_atime.tv_sec;
+		if (orangefs_inode->attr_valid & ATTR_ATIME_SET) {
+			attrs->atime = (time64_t)inode->i_atime.tv_sec;
 			attrs->mask |= ORANGEFS_ATTR_SYS_ATIME_SET;
 		}
 	}
-	if (iattr->ia_valid & ATTR_MTIME) {
+	if (orangefs_inode->attr_valid & ATTR_MTIME) {
 		attrs->mask |= ORANGEFS_ATTR_SYS_MTIME;
-		if (iattr->ia_valid & ATTR_MTIME_SET) {
-			attrs->mtime = (time64_t)iattr->ia_mtime.tv_sec;
+		if (orangefs_inode->attr_valid & ATTR_MTIME_SET) {
+			attrs->mtime = (time64_t)inode->i_mtime.tv_sec;
 			attrs->mask |= ORANGEFS_ATTR_SYS_MTIME_SET;
 		}
 	}
-	if (iattr->ia_valid & ATTR_CTIME)
+	if (orangefs_inode->attr_valid & ATTR_CTIME)
 		attrs->mask |= ORANGEFS_ATTR_SYS_CTIME;
 
 	/*
···
 	 * worry about ATTR_SIZE
 	 */
 
-	if (iattr->ia_valid & ATTR_MODE) {
-		tmp_mode = iattr->ia_mode;
-		if (tmp_mode & (S_ISVTX)) {
-			if (is_root_handle(inode)) {
-				/*
-				 * allow sticky bit to be set on root (since
-				 * it shows up that way by default anyhow),
-				 * but don't show it to the server
-				 */
-				tmp_mode -= S_ISVTX;
-			} else {
-				gossip_debug(GOSSIP_UTILS_DEBUG,
-					"%s: setting sticky bit not supported.\n",
-					__func__);
-				return -EINVAL;
-			}
-		}
-
-		if (tmp_mode & (S_ISUID)) {
-			gossip_debug(GOSSIP_UTILS_DEBUG,
-				"%s: setting setuid bit not supported.\n",
-				__func__);
-			return -EINVAL;
-		}
-
-		attrs->perms = ORANGEFS_util_translate_mode(tmp_mode);
+	if (orangefs_inode->attr_valid & ATTR_MODE) {
+		attrs->perms = ORANGEFS_util_translate_mode(inode->i_mode);
 		attrs->mask |= ORANGEFS_ATTR_SYS_PERM;
 	}
-
-	return 0;
 }
 
 static int orangefs_inode_type(enum orangefs_ds_type objtype)
···
 	gossip_debug(GOSSIP_UTILS_DEBUG, "%s: called on inode %pU flags %d\n",
 	    __func__, get_khandle_from_ino(inode), flags);
 
+again:
 	spin_lock(&inode->i_lock);
 	/* Must have all the attributes in the mask and be within cache time. */
 	if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
-	    inode->i_state & I_DIRTY) {
+	    orangefs_inode->attr_valid) {
+		if (orangefs_inode->attr_valid) {
+			spin_unlock(&inode->i_lock);
+			write_inode_now(inode, 1);
+			goto again;
+		}
 		spin_unlock(&inode->i_lock);
 		return 0;
 	}
···
 	if (ret != 0)
 		goto out;
 
+again2:
 	spin_lock(&inode->i_lock);
 	/* Must have all the attributes in the mask and be within cache time. */
 	if ((!flags && time_before(jiffies, orangefs_inode->getattr_time)) ||
-	    inode->i_state & I_DIRTY) {
+	    orangefs_inode->attr_valid) {
+		if (orangefs_inode->attr_valid) {
+			spin_unlock(&inode->i_lock);
+			write_inode_now(inode, 1);
+			goto again2;
+		}
 		gossip_debug(GOSSIP_UTILS_DEBUG, "%s: in cache or dirty\n",
 		    __func__);
 		ret = 0;
···
  * issues a orangefs setattr request to make sure the new attribute values
  * take effect if successful.  returns 0 on success; -errno otherwise
  */
-int orangefs_inode_setattr(struct inode *inode, struct iattr *iattr)
+int orangefs_inode_setattr(struct inode *inode)
 {
 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 	struct orangefs_kernel_op_s *new_op;
···
 	if (!new_op)
 		return -ENOMEM;
 
+	spin_lock(&inode->i_lock);
+	new_op->upcall.uid = from_kuid(&init_user_ns, orangefs_inode->attr_uid);
+	new_op->upcall.gid = from_kgid(&init_user_ns, orangefs_inode->attr_gid);
 	new_op->upcall.req.setattr.refn = orangefs_inode->refn;
-	ret = copy_attributes_from_inode(inode,
-		       &new_op->upcall.req.setattr.attributes,
-		       iattr);
-	if (ret >= 0) {
-		ret = service_operation(new_op, __func__,
-				get_interruptible_flag(inode));
+	copy_attributes_from_inode(inode,
+	    &new_op->upcall.req.setattr.attributes);
+	orangefs_inode->attr_valid = 0;
+	spin_unlock(&inode->i_lock);
 
-		gossip_debug(GOSSIP_UTILS_DEBUG,
-			     "orangefs_inode_setattr: returning %d\n",
-			     ret);
-	}
+	ret = service_operation(new_op, __func__,
+	    get_interruptible_flag(inode));
+	gossip_debug(GOSSIP_UTILS_DEBUG,
+	    "orangefs_inode_setattr: returning %d\n", ret);
+	if (ret)
+		orangefs_make_bad_inode(inode);
 
 	op_release(new_op);
 
 	if (ret == 0)
 		orangefs_inode->getattr_time = jiffies - 1;
-
 	return ret;
 }
 

fs/orangefs/super.c

···
 static int orangefs_write_inode(struct inode *inode,
 				struct writeback_control *wbc)
 {
-	struct iattr iattr;
 	gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_write_inode\n");
-	iattr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_ATIME |
-	    ATTR_ATIME_SET | ATTR_MTIME | ATTR_MTIME_SET | ATTR_CTIME;
-	iattr.ia_mode = inode->i_mode;
-	iattr.ia_uid = inode->i_uid;
-	iattr.ia_gid = inode->i_gid;
-	iattr.ia_atime = inode->i_atime;
-	iattr.ia_mtime = inode->i_mtime;
-	iattr.ia_ctime = inode->i_ctime;
-	return orangefs_inode_setattr(inode, &iattr);
+	return orangefs_inode_setattr(inode);
 }
 
 /*