+++ /dev/null
-/*
- * 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 http://www.opensolaris.org/os/licensing.
- * 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.
- */
-
-#include <sys/zfs_context.h>
-#include <sys/kstat.h>
-
-list_t zfs_dbgmsgs;
-int zfs_dbgmsg_size = 0;
-kmutex_t zfs_dbgmsgs_lock;
-int zfs_dbgmsg_maxsize = 4<<20; /* 4MB */
-kstat_t *zfs_dbgmsg_kstat;
-
-/*
- * By default only enable the internal ZFS debug messages when running
- * in userspace (ztest). The kernel log must be manually enabled.
- *
- * # Enable the kernel debug message log.
- * echo 1 > /sys/module/zfs/parameters/zfs_dbgmsg_enable
- *
- * # Clear the kernel debug message log.
- * echo 0 >/proc/spl/kstat/zfs/dbgmsg
- */
-#if defined(_KERNEL) && !defined(ZFS_DEBUG)
-int zfs_dbgmsg_enable = 0;
-#else
-int zfs_dbgmsg_enable = 1;
-#endif
-
-static int
-zfs_dbgmsg_headers(char *buf, size_t size)
-{
- (void) snprintf(buf, size, "%-12s %-8s\n", "timestamp", "message");
-
- return (0);
-}
-
-static int
-zfs_dbgmsg_data(char *buf, size_t size, void *data)
-{
- zfs_dbgmsg_t *zdm = (zfs_dbgmsg_t *)data;
-
- (void) snprintf(buf, size, "%-12llu %-s\n",
- (u_longlong_t)zdm->zdm_timestamp, zdm->zdm_msg);
-
- return (0);
-}
-
-static void *
-zfs_dbgmsg_addr(kstat_t *ksp, loff_t n)
-{
- zfs_dbgmsg_t *zdm = (zfs_dbgmsg_t *)ksp->ks_private;
-
- ASSERT(MUTEX_HELD(&zfs_dbgmsgs_lock));
-
- if (n == 0)
- ksp->ks_private = list_head(&zfs_dbgmsgs);
- else if (zdm)
- ksp->ks_private = list_next(&zfs_dbgmsgs, zdm);
-
- return (ksp->ks_private);
-}
-
-static void
-zfs_dbgmsg_purge(int max_size)
-{
- zfs_dbgmsg_t *zdm;
- int size;
-
- ASSERT(MUTEX_HELD(&zfs_dbgmsgs_lock));
-
- while (zfs_dbgmsg_size > max_size) {
- zdm = list_remove_head(&zfs_dbgmsgs);
- if (zdm == NULL)
- return;
-
- size = zdm->zdm_size;
- kmem_free(zdm, size);
- zfs_dbgmsg_size -= size;
- }
-}
-
-static int
-zfs_dbgmsg_update(kstat_t *ksp, int rw)
-{
- if (rw == KSTAT_WRITE)
- zfs_dbgmsg_purge(0);
-
- return (0);
-}
-
-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);
-
- zfs_dbgmsg_kstat = kstat_create("zfs", 0, "dbgmsg", "misc",
- KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
- if (zfs_dbgmsg_kstat) {
- zfs_dbgmsg_kstat->ks_lock = &zfs_dbgmsgs_lock;
- zfs_dbgmsg_kstat->ks_ndata = UINT32_MAX;
- zfs_dbgmsg_kstat->ks_private = NULL;
- zfs_dbgmsg_kstat->ks_update = zfs_dbgmsg_update;
- kstat_set_raw_ops(zfs_dbgmsg_kstat, zfs_dbgmsg_headers,
- zfs_dbgmsg_data, zfs_dbgmsg_addr);
- kstat_install(zfs_dbgmsg_kstat);
- }
-}
-
-void
-zfs_dbgmsg_fini(void)
-{
- if (zfs_dbgmsg_kstat)
- kstat_delete(zfs_dbgmsg_kstat);
-
- mutex_enter(&zfs_dbgmsgs_lock);
- zfs_dbgmsg_purge(0);
- mutex_exit(&zfs_dbgmsgs_lock);
- mutex_destroy(&zfs_dbgmsgs_lock);
-}
-
-void
-__zfs_dbgmsg(char *buf)
-{
- zfs_dbgmsg_t *zdm;
- int size;
-
- size = sizeof (zfs_dbgmsg_t) + strlen(buf);
- zdm = kmem_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);
- zfs_dbgmsg_size += size;
- zfs_dbgmsg_purge(MAX(zfs_dbgmsg_maxsize, 0));
- mutex_exit(&zfs_dbgmsgs_lock);
-}
-
-void
-__set_error(const char *file, const char *func, int line, int err)
-{
- if (zfs_flags & ZFS_DEBUG_SET_ERROR)
- __dprintf(file, func, line, "error %lu", err);
-}
-
-#ifdef _KERNEL
-void
-__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
-{
- const char *newfile;
- va_list adx;
- size_t size;
- char *buf;
- char *nl;
- int i;
-
- if (!zfs_dbgmsg_enable &&
- !(zfs_flags & (ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SET_ERROR)))
- return;
-
- size = 1024;
- buf = kmem_alloc(size, KM_SLEEP);
-
- /*
- * Get rid of annoying prefix to filename.
- */
- newfile = strrchr(file, '/');
- if (newfile != NULL) {
- newfile = newfile + 1; /* Get rid of leading / */
- } else {
- newfile = file;
- }
-
- i = snprintf(buf, size, "%s:%d:%s(): ", newfile, line, func);
-
- if (i < size) {
- va_start(adx, fmt);
- (void) vsnprintf(buf + i, size - i, fmt, adx);
- va_end(adx);
- }
-
- /*
- * Get rid of trailing newline.
- */
- nl = strrchr(buf, '\n');
- if (nl != NULL)
- *nl = '\0';
-
- /*
- * To get this data enable the zfs__dprintf trace point as shown:
- *
- * # Enable zfs__dprintf tracepoint, clear the tracepoint ring buffer
- * $ echo 1 > /sys/module/zfs/parameters/zfs_flags
- * $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable
- * $ echo 0 > /sys/kernel/debug/tracing/trace
- *
- * # Dump the ring buffer.
- * $ cat /sys/kernel/debug/tracing/trace
- */
- if (zfs_flags & (ZFS_DEBUG_DPRINTF | ZFS_DEBUG_SET_ERROR))
- DTRACE_PROBE1(zfs__dprintf, char *, buf);
-
- /*
- * To get this data enable the zfs debug log as shown:
- *
- * # Set zfs_dbgmsg enable, clear the log buffer
- * $ echo 1 > /sys/module/zfs/parameters/zfs_dbgmsg_enable
- * $ echo 0 > /proc/spl/kstat/zfs/dbgmsg
- *
- * # Dump the log buffer.
- * $ cat /proc/spl/kstat/zfs/dbgmsg
- */
- if (zfs_dbgmsg_enable)
- __zfs_dbgmsg(buf);
-
- kmem_free(buf, size);
-}
-
-#else
-
-void
-zfs_dbgmsg_print(const char *tag)
-{
- zfs_dbgmsg_t *zdm;
-
- (void) printf("ZFS_DBGMSG(%s):\n", tag);
- mutex_enter(&zfs_dbgmsgs_lock);
- for (zdm = list_head(&zfs_dbgmsgs); zdm;
- zdm = list_next(&zfs_dbgmsgs, zdm))
- (void) printf("%s\n", zdm->zdm_msg);
- mutex_exit(&zfs_dbgmsgs_lock);
-}
-#endif /* _KERNEL */
-
-#ifdef _KERNEL
-module_param(zfs_dbgmsg_enable, int, 0644);
-MODULE_PARM_DESC(zfs_dbgmsg_enable, "Enable ZFS debug message log");
-
-module_param(zfs_dbgmsg_maxsize, int, 0644);
-MODULE_PARM_DESC(zfs_dbgmsg_maxsize, "Maximum ZFS debug log size");
-#endif
projects / mirror_ubuntu-bionic-kernel.git / blobdiff