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zfs_debug: specific variant for userspace

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Just nice and simple, with room to grow.

Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #16492
This commit is contained in:
Rob Norris
2024-08-28 22:28:58 +10:00
committed by Brian Behlendorf
parent c22d56e3ed
commit e8ede2ba78
5 changed files with 118 additions and 82 deletions
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lib/libzpool/zfs_debug.c
+106
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
* Copyright (c) 2024, Rob Norris <robn@despairlabs.com>
*/
#include <sys/zfs_context.h>
typedef struct zfs_dbgmsg {
list_node_t zdm_node;
uint64_t zdm_timestamp;
uint_t zdm_size;
char zdm_msg[]; /* variable length allocation */
} zfs_dbgmsg_t;
static list_t zfs_dbgmsgs;
static kmutex_t zfs_dbgmsgs_lock;
int zfs_dbgmsg_enable = B_TRUE;
void
zfs_dbgmsg_init(void)
{
list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
offsetof(zfs_dbgmsg_t, zdm_node));
mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
}
void
zfs_dbgmsg_fini(void)
{
zfs_dbgmsg_t *zdm;
while ((zdm = list_remove_head(&zfs_dbgmsgs)))
umem_free(zdm, zdm->zdm_size);
mutex_destroy(&zfs_dbgmsgs_lock);
}
void
__set_error(const char *file, const char *func, int line, int err)
{
if (zfs_flags & ZFS_DEBUG_SET_ERROR)
__dprintf(B_FALSE, file, func, line, "error %lu",
(ulong_t)err);
}
void
__zfs_dbgmsg(char *buf)
{
uint_t size = sizeof (zfs_dbgmsg_t) + strlen(buf) + 1;
zfs_dbgmsg_t *zdm = umem_zalloc(size, KM_SLEEP);
zdm->zdm_size = size;
zdm->zdm_timestamp = gethrestime_sec();
strcpy(zdm->zdm_msg, buf);
mutex_enter(&zfs_dbgmsgs_lock);
list_insert_tail(&zfs_dbgmsgs, zdm);
mutex_exit(&zfs_dbgmsgs_lock);
}
void
zfs_dbgmsg_print(int fd, const char *tag)
{
ssize_t ret __attribute__((unused));
mutex_enter(&zfs_dbgmsgs_lock);
/*
* We use write() in this function instead of printf()
* so it is safe to call from a signal handler.
*/
ret = write(fd, "ZFS_DBGMSG(", 11);
ret = write(fd, tag, strlen(tag));
ret = write(fd, ") START:\n", 9);
for (zfs_dbgmsg_t *zdm = list_head(&zfs_dbgmsgs); zdm != NULL;
zdm = list_next(&zfs_dbgmsgs, zdm)) {
ret = write(fd, zdm->zdm_msg, strlen(zdm->zdm_msg));
ret = write(fd, "\n", 1);
}
ret = write(fd, "ZFS_DBGMSG(", 11);
ret = write(fd, tag, strlen(tag));
ret = write(fd, ") END\n", 6);
mutex_exit(&zfs_dbgmsgs_lock);
}