02730c333c
Enable picky cstyle checks and resolve the new warnings. The vast majority of the changes needed were to handle minor issues with whitespace formatting. This patch contains no functional changes. Non-whitespace changes are as follows: * 8 times ; to { } in for/while loop * fix missing ; in cmd/zed/agents/zfs_diagnosis.c * comment (confim -> confirm) * change endline , to ; in cmd/zpool/zpool_main.c * a number of /* BEGIN CSTYLED */ /* END CSTYLED */ blocks * /* CSTYLED */ markers * change == 0 to ! * ulong to unsigned long in module/zfs/dsl_scan.c * rearrangement of module_param lines in module/zfs/metaslab.c * add { } block around statement after for_each_online_node Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Håkan Johansson <f96hajo@chalmers.se> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #5465
240 lines
5.6 KiB
C
240 lines
5.6 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/kstat.h>
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list_t zfs_dbgmsgs;
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int zfs_dbgmsg_size = 0;
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kmutex_t zfs_dbgmsgs_lock;
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int zfs_dbgmsg_maxsize = 4<<20; /* 4MB */
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kstat_t *zfs_dbgmsg_kstat;
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/*
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* By default only enable the internal ZFS debug messages when running
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* in userspace (ztest). The kernel log must be manually enabled.
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*
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* # Enable the kernel debug message log.
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* echo 1 > /sys/module/zfs/parameters/zfs_dbgmsg_enable
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*
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* # Clear the kernel debug message log.
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* echo 0 >/proc/spl/kstat/zfs/dbgmsg
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*/
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#if defined(_KERNEL)
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int zfs_dbgmsg_enable = 0;
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#else
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int zfs_dbgmsg_enable = 1;
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#endif
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static int
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zfs_dbgmsg_headers(char *buf, size_t size)
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{
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(void) snprintf(buf, size, "%-12s %-8s\n", "timestamp", "message");
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return (0);
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}
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static int
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zfs_dbgmsg_data(char *buf, size_t size, void *data)
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{
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zfs_dbgmsg_t *zdm = (zfs_dbgmsg_t *)data;
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(void) snprintf(buf, size, "%-12llu %-s\n",
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(u_longlong_t)zdm->zdm_timestamp, zdm->zdm_msg);
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return (0);
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}
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static void *
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zfs_dbgmsg_addr(kstat_t *ksp, loff_t n)
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{
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zfs_dbgmsg_t *zdm = (zfs_dbgmsg_t *)ksp->ks_private;
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ASSERT(MUTEX_HELD(&zfs_dbgmsgs_lock));
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if (n == 0)
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ksp->ks_private = list_head(&zfs_dbgmsgs);
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else if (zdm)
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ksp->ks_private = list_next(&zfs_dbgmsgs, zdm);
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return (ksp->ks_private);
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}
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static void
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zfs_dbgmsg_purge(int max_size)
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{
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zfs_dbgmsg_t *zdm;
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int size;
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ASSERT(MUTEX_HELD(&zfs_dbgmsgs_lock));
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while (zfs_dbgmsg_size > max_size) {
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zdm = list_remove_head(&zfs_dbgmsgs);
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if (zdm == NULL)
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return;
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size = zdm->zdm_size;
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kmem_free(zdm, size);
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zfs_dbgmsg_size -= size;
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}
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}
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static int
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zfs_dbgmsg_update(kstat_t *ksp, int rw)
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{
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if (rw == KSTAT_WRITE)
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zfs_dbgmsg_purge(0);
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return (0);
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}
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void
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zfs_dbgmsg_init(void)
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{
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list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
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offsetof(zfs_dbgmsg_t, zdm_node));
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mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
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zfs_dbgmsg_kstat = kstat_create("zfs", 0, "dbgmsg", "misc",
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KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
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if (zfs_dbgmsg_kstat) {
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zfs_dbgmsg_kstat->ks_lock = &zfs_dbgmsgs_lock;
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zfs_dbgmsg_kstat->ks_ndata = UINT32_MAX;
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zfs_dbgmsg_kstat->ks_private = NULL;
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zfs_dbgmsg_kstat->ks_update = zfs_dbgmsg_update;
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kstat_set_raw_ops(zfs_dbgmsg_kstat, zfs_dbgmsg_headers,
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zfs_dbgmsg_data, zfs_dbgmsg_addr);
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kstat_install(zfs_dbgmsg_kstat);
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}
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}
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void
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zfs_dbgmsg_fini(void)
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{
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if (zfs_dbgmsg_kstat)
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kstat_delete(zfs_dbgmsg_kstat);
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mutex_enter(&zfs_dbgmsgs_lock);
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zfs_dbgmsg_purge(0);
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mutex_exit(&zfs_dbgmsgs_lock);
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mutex_destroy(&zfs_dbgmsgs_lock);
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}
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void
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__zfs_dbgmsg(char *buf)
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{
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zfs_dbgmsg_t *zdm;
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int size;
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size = sizeof (zfs_dbgmsg_t) + strlen(buf);
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zdm = kmem_zalloc(size, KM_SLEEP);
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zdm->zdm_size = size;
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zdm->zdm_timestamp = gethrestime_sec();
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strcpy(zdm->zdm_msg, buf);
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mutex_enter(&zfs_dbgmsgs_lock);
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list_insert_tail(&zfs_dbgmsgs, zdm);
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zfs_dbgmsg_size += size;
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zfs_dbgmsg_purge(MAX(zfs_dbgmsg_maxsize, 0));
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mutex_exit(&zfs_dbgmsgs_lock);
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}
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#ifdef _KERNEL
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void
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__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
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{
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const char *newfile;
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va_list adx;
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size_t size;
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char *buf;
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char *nl;
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if (!zfs_dbgmsg_enable && !(zfs_flags & ZFS_DEBUG_DPRINTF))
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return;
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size = 1024;
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buf = kmem_alloc(size, KM_SLEEP);
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/*
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* Get rid of annoying prefix to filename.
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*/
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newfile = strrchr(file, '/');
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if (newfile != NULL) {
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newfile = newfile + 1; /* Get rid of leading / */
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} else {
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newfile = file;
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}
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va_start(adx, fmt);
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(void) vsnprintf(buf, size, fmt, adx);
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va_end(adx);
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/*
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* Get rid of trailing newline.
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*/
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nl = strrchr(buf, '\n');
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if (nl != NULL)
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*nl = '\0';
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/*
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* To get this data enable the zfs__dprintf trace point as shown:
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*
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* # Enable zfs__dprintf tracepoint, clear the tracepoint ring buffer
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* $ echo 1 > /sys/module/zfs/parameters/zfs_flags
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* $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable
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* $ echo 0 > /sys/kernel/debug/tracing/trace
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*
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* # Dump the ring buffer.
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* $ cat /sys/kernel/debug/tracing/trace
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*/
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if (zfs_flags & ZFS_DEBUG_DPRINTF)
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DTRACE_PROBE4(zfs__dprintf,
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char *, newfile, char *, func, int, line, char *, buf);
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/*
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* To get this data enable the zfs debug log as shown:
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*
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* # Set zfs_dbgmsg enable, clear the log buffer
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* $ echo 1 > /sys/module/zfs/parameters/zfs_dbgmsg_enable
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* $ echo 0 > /proc/spl/kstat/zfs/dbgmsg
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*
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* # Dump the log buffer.
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* $ cat /proc/spl/kstat/zfs/dbgmsg
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*/
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if (zfs_dbgmsg_enable)
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__zfs_dbgmsg(buf);
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kmem_free(buf, size);
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}
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#endif /* _KERNEL */
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#ifdef _KERNEL
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module_param(zfs_dbgmsg_enable, int, 0644);
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MODULE_PARM_DESC(zfs_dbgmsg_enable, "Enable ZFS debug message log");
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module_param(zfs_dbgmsg_maxsize, int, 0644);
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MODULE_PARM_DESC(zfs_dbgmsg_maxsize, "Maximum ZFS debug log size");
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#endif
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