+++ /dev/null
-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.gnu.org/licenses/gpl-2.0.html
- *
- * GPL HEADER END
- */
-
-/*
- * Copyright 2017 Cray Inc. All rights reserved.
- * Author: Frank Zago.
- */
-
-/* Check that the inode number is the same whether the call to
- * vfs_getattr is coming from a system call or from a kthread. When
- * CONFIG_X86_X32 was set, the result used to be different for
- * Lustre. In addition, a user can also check that the same inode
- * number is also seen from the kernel and userspace. */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/completion.h>
-#include <linux/kthread.h>
-#include <linux/fs.h>
-#include <linux/version.h>
-
-/* Random ID passed by userspace, and printed in messages, used to
- * separate different runs of that module. */
-static int run_id;
-module_param(run_id, int, 0644);
-MODULE_PARM_DESC(run_id, "run ID");
-
-/* Name of the file to stat. */
-static char fname[4096];
-module_param_string(fname, fname, sizeof(fname), 0644);
-MODULE_PARM_DESC(fname, "name of file to stat");
-
-static DECLARE_COMPLETION(thr_start);
-
-#define PREFIX "lustre_kinode_%u:"
-
-static int stat_file(struct kstat *stbuf)
-{
- struct file *fd;
- int rc;
-
- fd = filp_open(fname, O_RDONLY, 0);
- if (IS_ERR(fd)) {
- pr_err(PREFIX " can't open file %s\n", run_id, fname);
- return -EIO;
- }
-
-#if defined(HAVE_USER_NAMESPACE_ARG) || defined(HAVE_INODEOPS_ENHANCED_GETATTR)
- rc = vfs_getattr(&fd->f_path, stbuf, STATX_INO, AT_STATX_SYNC_AS_STAT);
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
- rc = vfs_getattr(&fd->f_path, stbuf);
-#else
- rc = vfs_getattr(fd->f_path.mnt, fd->f_path.dentry, stbuf);
-#endif
- if (rc != 0) {
- pr_err(PREFIX " vfs_getattr failed: %d\n", run_id, rc);
- goto out;
- }
-
- pr_err(PREFIX " inode is %llu\n", run_id, stbuf->ino);
- rc = 0;
-
-out:
- filp_close(fd, NULL);
-
- return rc;
-}
-
-static int stat_thread(void *data)
-{
- struct kstat *stbuf = data;
- int rc;
-
- /* Signal caller that thread has started. */
- complete(&thr_start);
-
- rc = stat_file(stbuf);
-
- /* Wait for call to kthread_stop. */
- set_current_state(TASK_INTERRUPTIBLE);
- while (!kthread_should_stop()) {
- schedule();
- set_current_state(TASK_INTERRUPTIBLE);
- }
- set_current_state(TASK_RUNNING);
-
- return rc;
-}
-
-static int __init kinode_init(void)
-{
- struct task_struct *thr;
- struct kstat stbuf1;
- struct kstat stbuf2;
- int rc;
-
-#ifdef CONFIG_X86_X32
- pr_err(PREFIX " CONFIG_X86_X32 is set\n", run_id);
-#else
- pr_err(PREFIX " CONFIG_X86_X32 is not set\n", run_id);
-#endif
-
- if (strlen(fname) < 1) {
- pr_err(PREFIX " invalid file name '%s'\n", run_id, fname);
- goto out;
- }
-
- rc = stat_file(&stbuf1);
- if (rc) {
- pr_err(PREFIX " direct stat failed: %d\n", run_id, rc);
- goto out;
- }
-
- /* Run the same from a kthread. */
- thr = kthread_run(stat_thread, &stbuf2, "kinode_%u", run_id);
- if (IS_ERR(thr)) {
- pr_err(PREFIX " Cannot create kthread\n", run_id);
- goto out;
- }
-
- /* Wait for the thread to start, then wait for it to
- * terminate. */
- wait_for_completion(&thr_start);
- rc = kthread_stop(thr);
- if (rc) {
- pr_err(PREFIX " indirect stat failed: %d\n", run_id, rc);
- goto out;
- }
-
- if (stbuf1.ino != stbuf2.ino)
- pr_err(PREFIX " inode numbers are different: %llu %llu\n",
- run_id, stbuf1.ino, stbuf2.ino);
- else
- /* below message is checked in sanity.sh test_129 */
- pr_err(PREFIX " inode numbers are identical: %llu\n",
- run_id, stbuf1.ino);
-
-out:
- /* Don't load. */
- return -EINVAL;
-}
-
-static void __exit kinode_exit(void)
-{
-}
-
-MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
-MODULE_DESCRIPTION("Lustre inode stat test module");
-MODULE_VERSION(LUSTRE_VERSION_STRING);
-MODULE_LICENSE("GPL");
-
-module_init(kinode_init);
-module_exit(kinode_exit);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff