/*
 *  This file is part of the SPL: Solaris Porting Layer.
 *
 *  Copyright (c) 2008 Lawrence Livermore National Security, LLC.
 *  Produced at Lawrence Livermore National Laboratory
 *  Written by:
 *          Brian Behlendorf <behlendorf1@llnl.gov>,
 *          Herb Wartens <wartens2@llnl.gov>,
 *          Jim Garlick <garlick@llnl.gov>
 *  UCRL-CODE-235197
 *
 *  This is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This 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
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
 */

#include "splat-internal.h"
#include <linux/rcupdate.h>

#define SPLAT_SUBSYSTEM_VNODE		0x0900
#define SPLAT_VNODE_NAME		"vnode"
#define SPLAT_VNODE_DESC		"Kernel Vnode Tests"

#define SPLAT_VNODE_TEST1_ID		0x0901
#define SPLAT_VNODE_TEST1_NAME		"vn_open"
#define SPLAT_VNODE_TEST1_DESC		"Vn_open Test"

#define SPLAT_VNODE_TEST2_ID		0x0902
#define SPLAT_VNODE_TEST2_NAME		"vn_openat"
#define SPLAT_VNODE_TEST2_DESC		"Vn_openat Test"

#define SPLAT_VNODE_TEST3_ID		0x0903
#define SPLAT_VNODE_TEST3_NAME		"vn_rdwr"
#define SPLAT_VNODE_TEST3_DESC		"Vn_rdwrt Test"

#define SPLAT_VNODE_TEST4_ID		0x0904
#define SPLAT_VNODE_TEST4_NAME		"vn_rename"
#define SPLAT_VNODE_TEST4_DESC		"Vn_rename Test"

#define SPLAT_VNODE_TEST5_ID		0x0905
#define SPLAT_VNODE_TEST5_NAME		"vn_getattr"
#define SPLAT_VNODE_TEST5_DESC		"Vn_getattr Test"

#define SPLAT_VNODE_TEST6_ID		0x0906
#define SPLAT_VNODE_TEST6_NAME		"vn_sync"
#define SPLAT_VNODE_TEST6_DESC		"Vn_sync Test"

#define SPLAT_VNODE_TEST7_ID		0x0907
#define SPLAT_VNODE_TEST7_NAME		"vn_getf"
#define SPLAT_VNODE_TEST7_DESC		"vn_getf/vn_releasef Test"

#define SPLAT_VNODE_TEST_FILE		"/etc/fstab"
#define SPLAT_VNODE_TEST_FILE_AT	"etc/fstab"
#define SPLAT_VNODE_TEST_FILE_RW	"/tmp/spl.vnode.tmp"
#define SPLAT_VNODE_TEST_FILE_RW1	"/tmp/spl.vnode.tmp.1"
#define SPLAT_VNODE_TEST_FILE_RW2	"/tmp/spl.vnode.tmp.2"

static int
splat_vnode_test1(struct file *file, void *arg)
{
	vnode_t *vp;
	int rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE, UIO_SYSSPACE,
			  FREAD, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST1_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		return rc;
	}

        rc = VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);

	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST1_NAME,
			     "Failed to vn_close test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		return rc;
	}

	splat_vprint(file, SPLAT_VNODE_TEST1_NAME, "Successfully vn_open'ed "
		     "and vn_closed test file: %s\n", SPLAT_VNODE_TEST_FILE);

        return rc;
} /* splat_vnode_test1() */

static int
splat_vnode_test2(struct file *file, void *arg)
{
	vnode_t *vp;
	int rc;

	if ((rc = vn_openat(SPLAT_VNODE_TEST_FILE_AT, UIO_SYSSPACE,
			    FREAD, 0644, &vp, 0, 0, rootdir, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST2_NAME,
			     "Failed to vn_openat test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		return rc;
	}

        rc = VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);

	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST2_NAME,
			     "Failed to vn_close test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		return rc;
	}

	splat_vprint(file, SPLAT_VNODE_TEST2_NAME, "Successfully vn_openat'ed "
		     "and vn_closed test file: %s\n", SPLAT_VNODE_TEST_FILE);

        return rc;
} /* splat_vnode_test2() */

static int
splat_vnode_test3(struct file *file, void *arg)
{
	vnode_t *vp;
	char buf1[32] = "SPL VNode Interface Test File\n";
	char buf2[32] = "";
	int rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE,
			  FWRITE | FREAD | FCREAT | FEXCL,
			  0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST3_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		return rc;
	}

        rc = vn_rdwr(UIO_WRITE, vp, buf1, strlen(buf1), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST3_NAME,
			     "Failed vn_rdwr write of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

        rc = vn_rdwr(UIO_READ, vp, buf2, strlen(buf1), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST3_NAME,
			     "Failed vn_rdwr read of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

	if (strncmp(buf1, buf2, strlen(buf1))) {
		rc = -EINVAL;
		splat_vprint(file, SPLAT_VNODE_TEST3_NAME,
			     "Failed strncmp data written does not match "
			     "data read\nWrote: %sRead:  %s\n", buf1, buf2);
		goto out;
	}

	rc = 0;
	splat_vprint(file, SPLAT_VNODE_TEST3_NAME, "Wrote: %s", buf1);
	splat_vprint(file, SPLAT_VNODE_TEST3_NAME, "Read:  %s", buf2);
	splat_vprint(file, SPLAT_VNODE_TEST3_NAME, "Successfully wrote and "
		     "read expected data pattern to test file: %s\n",
		     SPLAT_VNODE_TEST_FILE_RW);

out:
        VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);
	vn_remove(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE, RMFILE);

        return rc;
} /* splat_vnode_test3() */

static int
splat_vnode_test4(struct file *file, void *arg)
{
	vnode_t *vp;
	char buf1[32] = "SPL VNode Interface Test File\n";
	char buf2[32] = "";
	int rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE_RW1, UIO_SYSSPACE,
			  FWRITE | FREAD | FCREAT | FEXCL, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST4_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW1, rc);
		goto out;
	}

        rc = vn_rdwr(UIO_WRITE, vp, buf1, strlen(buf1), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST4_NAME,
			     "Failed vn_rdwr write of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW1, rc);
		goto out2;
	}

        VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);

	rc = vn_rename(SPLAT_VNODE_TEST_FILE_RW1,SPLAT_VNODE_TEST_FILE_RW2,0);
	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST4_NAME, "Failed vn_rename "
			     "%s -> %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW1,
			     SPLAT_VNODE_TEST_FILE_RW2, rc);
		goto out;
	}

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE_RW2, UIO_SYSSPACE,
			  FREAD | FEXCL, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST4_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW2, rc);
		goto out;
	}

        rc = vn_rdwr(UIO_READ, vp, buf2, strlen(buf1), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST4_NAME,
			     "Failed vn_rdwr read of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW2, rc);
		goto out2;
	}

	if (strncmp(buf1, buf2, strlen(buf1))) {
		rc = EINVAL;
		splat_vprint(file, SPLAT_VNODE_TEST4_NAME,
			     "Failed strncmp data written does not match "
			     "data read\nWrote: %sRead:  %s\n", buf1, buf2);
		goto out2;
	}

	rc = 0;
	splat_vprint(file, SPLAT_VNODE_TEST4_NAME, "Wrote to %s:  %s",
		     SPLAT_VNODE_TEST_FILE_RW1, buf1);
	splat_vprint(file, SPLAT_VNODE_TEST4_NAME, "Read from %s: %s",
		     SPLAT_VNODE_TEST_FILE_RW2, buf2);
	splat_vprint(file, SPLAT_VNODE_TEST4_NAME, "Successfully renamed "
		     "test file %s -> %s and verified data pattern\n",
		     SPLAT_VNODE_TEST_FILE_RW1, SPLAT_VNODE_TEST_FILE_RW2);
out2:
        VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);
out:
	vn_remove(SPLAT_VNODE_TEST_FILE_RW1, UIO_SYSSPACE, RMFILE);
	vn_remove(SPLAT_VNODE_TEST_FILE_RW2, UIO_SYSSPACE, RMFILE);

        return rc;
} /* splat_vnode_test4() */

static int
splat_vnode_test5(struct file *file, void *arg)
{
	vnode_t *vp;
	vattr_t vap;
	int rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE, UIO_SYSSPACE,
			  FREAD, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST5_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		return rc;
	}

	rc = VOP_GETATTR(vp, &vap, 0, 0, NULL);
	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST5_NAME,
			     "Failed to vn_getattr test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE, rc);
		goto out;
	}

	if (vap.va_type != VREG) {
		rc = -EINVAL;
		splat_vprint(file, SPLAT_VNODE_TEST5_NAME,
			     "Failed expected regular file type "
			     "(%d != VREG): %s (%d)\n", vap.va_type,
			     SPLAT_VNODE_TEST_FILE, rc);
		goto out;
	}

	splat_vprint(file, SPLAT_VNODE_TEST1_NAME, "Successfully "
		     "vn_getattr'ed test file: %s\n", SPLAT_VNODE_TEST_FILE);

out:
        VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);

        return rc;
} /* splat_vnode_test5() */

static int
splat_vnode_test6(struct file *file, void *arg)
{
	vnode_t *vp;
	char buf[32] = "SPL VNode Interface Test File\n";
	int rc;

	if ((rc = vn_open(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE,
			  FWRITE | FCREAT | FEXCL, 0644, &vp, 0, 0))) {
		splat_vprint(file, SPLAT_VNODE_TEST6_NAME,
			     "Failed to vn_open test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		return rc;
	}

        rc = vn_rdwr(UIO_WRITE, vp, buf, strlen(buf), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST6_NAME,
			     "Failed vn_rdwr write of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

	rc = vn_fsync(vp, 0, 0, 0);
	if (rc) {
		splat_vprint(file, SPLAT_VNODE_TEST6_NAME,
			     "Failed vn_fsync of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

	rc = 0;
	splat_vprint(file, SPLAT_VNODE_TEST6_NAME, "Successfully "
		     "fsync'ed test file %s\n", SPLAT_VNODE_TEST_FILE_RW);
out:
        VOP_CLOSE(vp, 0, 0, 0, 0, 0);
        VN_RELE(vp);
	vn_remove(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE, RMFILE);

        return rc;
} /* splat_vnode_test6() */

/* Basically a slightly modified version of sys_close() */
static int
fd_uninstall(int fd)
{
        struct file *fp;
        struct files_struct *files = current->files;
        struct fdtable *fdt;

        spin_lock(&files->file_lock);
        fdt = files_fdtable(files);

        if (fd >= fdt->max_fds)
                goto out_unlock;

        fp = fdt->fd[fd];
        if (!fp)
                goto out_unlock;

        rcu_assign_pointer(fdt->fd[fd], NULL);
        FD_CLR(fd, fdt->close_on_exec);

	 /* Dropping the lock here exposes a minor race but it allows me
	  * to use the existing kernel interfaces for this, and for a test
	  * case I think that's reasonable. */
        spin_unlock(&files->file_lock);
        put_unused_fd(fd);

out_unlock:
        spin_unlock(&files->file_lock);
        return -EBADF;
} /* fd_uninstall() */

static int
splat_vnode_test7(struct file *file, void *arg)
{
	char buf1[32] = "SPL VNode Interface Test File\n";
	char buf2[32] = "";
	struct file *lfp;
	file_t *fp;
	int rc, fd;

	/* Prep work needed to test getf/releasef */
	fd = get_unused_fd();
	if (fd < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST7_NAME,
			     "Failed to get unused fd (%d)\n", fd);
		return fd;
	}

        lfp = filp_open(SPLAT_VNODE_TEST_FILE_RW, O_RDWR|O_CREAT|O_EXCL, 0644);
	if (IS_ERR(lfp)) {
		put_unused_fd(fd);
		rc = PTR_ERR(lfp);
		splat_vprint(file, SPLAT_VNODE_TEST7_NAME,
			     "Failed to filp_open: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		return rc;
	}

	/* Pair up the new fd and lfp in the current context, this allows
	 * getf to lookup the file struct simply by the known open fd */
	fd_install(fd, lfp);

	/* Actual getf()/releasef() test */
	fp = vn_getf(fd);
	if (fp == NULL) {
		rc = -EINVAL;
		splat_vprint(file, SPLAT_VNODE_TEST7_NAME,
			     "Failed to getf fd %d: (%d)\n", fd, rc);
		goto out;
	}

        rc = vn_rdwr(UIO_WRITE, fp->f_vnode, buf1, strlen(buf1), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST7_NAME,
			     "Failed vn_rdwr write of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

        rc = vn_rdwr(UIO_READ, fp->f_vnode, buf2, strlen(buf1), 0,
                     UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL);
	if (rc < 0) {
		splat_vprint(file, SPLAT_VNODE_TEST7_NAME,
			     "Failed vn_rdwr read of test file: %s (%d)\n",
			     SPLAT_VNODE_TEST_FILE_RW, rc);
		goto out;
	}

	if (strncmp(buf1, buf2, strlen(buf1))) {
		rc = -EINVAL;
		splat_vprint(file, SPLAT_VNODE_TEST7_NAME,
			     "Failed strncmp data written does not match "
			     "data read\nWrote: %sRead:  %s\n", buf1, buf2);
		goto out;
	}

	rc = 0;
	splat_vprint(file, SPLAT_VNODE_TEST3_NAME, "Wrote: %s", buf1);
	splat_vprint(file, SPLAT_VNODE_TEST3_NAME, "Read:  %s", buf2);
	splat_vprint(file, SPLAT_VNODE_TEST3_NAME, "Successfully wrote and "
		     "read expected data pattern to test file: %s\n",
		     SPLAT_VNODE_TEST_FILE_RW);
out:
	vn_releasef(fd);
	fd_uninstall(fd);
        filp_close(lfp, 0);
	vn_remove(SPLAT_VNODE_TEST_FILE_RW, UIO_SYSSPACE, RMFILE);

        return rc;
} /* splat_vnode_test7() */

splat_subsystem_t *
splat_vnode_init(void)
{
        splat_subsystem_t *sub;

        sub = kmalloc(sizeof(*sub), GFP_KERNEL);
        if (sub == NULL)
                return NULL;

        memset(sub, 0, sizeof(*sub));
        strncpy(sub->desc.name, SPLAT_VNODE_NAME, SPLAT_NAME_SIZE);
	strncpy(sub->desc.desc, SPLAT_VNODE_DESC, SPLAT_DESC_SIZE);
        INIT_LIST_HEAD(&sub->subsystem_list);
	INIT_LIST_HEAD(&sub->test_list);
        spin_lock_init(&sub->test_lock);
        sub->desc.id = SPLAT_SUBSYSTEM_VNODE;

        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST1_NAME, SPLAT_VNODE_TEST1_DESC,
	                SPLAT_VNODE_TEST1_ID, splat_vnode_test1);
        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST2_NAME, SPLAT_VNODE_TEST2_DESC,
	                SPLAT_VNODE_TEST2_ID, splat_vnode_test2);
        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST3_NAME, SPLAT_VNODE_TEST3_DESC,
	                SPLAT_VNODE_TEST3_ID, splat_vnode_test3);
        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST4_NAME, SPLAT_VNODE_TEST4_DESC,
	                SPLAT_VNODE_TEST4_ID, splat_vnode_test4);
        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST5_NAME, SPLAT_VNODE_TEST5_DESC,
	                SPLAT_VNODE_TEST5_ID, splat_vnode_test5);
        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST6_NAME, SPLAT_VNODE_TEST6_DESC,
	                SPLAT_VNODE_TEST6_ID, splat_vnode_test6);
        SPLAT_TEST_INIT(sub, SPLAT_VNODE_TEST7_NAME, SPLAT_VNODE_TEST7_DESC,
	                SPLAT_VNODE_TEST7_ID, splat_vnode_test7);

        return sub;
} /* splat_vnode_init() */

void
splat_vnode_fini(splat_subsystem_t *sub)
{
        ASSERT(sub);

        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST7_ID);
        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST6_ID);
        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST5_ID);
        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST4_ID);
        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST3_ID);
        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST2_ID);
        SPLAT_TEST_FINI(sub, SPLAT_VNODE_TEST1_ID);

        kfree(sub);
} /* splat_vnode_fini() */

int
splat_vnode_id(void)
{
        return SPLAT_SUBSYSTEM_VNODE;
} /* splat_vnode_id() */