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8d1489735b
Add nvlist_snprintf() to print a nvlist to a buffer. This is basically the snprintf() version of dump_nvlist(). Along with that, add a zfs_dbgmsg_nvlist() to print out an nvlist to dbgmsg. This will aid in debugging. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #17215
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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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 https://opensource.org/licenses/CDDL-1.0.
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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) 2025 by Lawrence Livermore National Security, LLC.
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*/
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/*
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* This file contains zfs_dbgmsg() specific functions that are not OS or
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* userspace specific.
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*/
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#if !defined(_KERNEL)
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#include <string.h>
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#endif
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#include <sys/zfs_context.h>
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#include <sys/zfs_debug.h>
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#include <sys/nvpair.h>
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/*
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* Given a multi-line string, print out one of the lines and return a pointer
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* to the next line. Lines are demarcated by '\n'. Note: this modifies the
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* input string (buf[]).
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*
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* This function is meant to be used in a loop like:
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* while (buf != NULL)
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* buf = kernel_print_one_line(buf);
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*
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* This function is useful for printing large, multi-line text buffers.
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*
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* Returns the pointer to the beginning of the next line in buf[], or NULL
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* if it's the last line, or nothing more to print.
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*/
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static char *
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zfs_dbgmsg_one_line(char *buf)
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{
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char *nl;
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if (!buf)
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return (NULL);
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nl = strchr(buf, '\n');
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if (nl == NULL) {
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__zfs_dbgmsg(buf);
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return (NULL); /* done */
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}
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*nl = '\0';
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__zfs_dbgmsg(buf);
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return (nl + 1);
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}
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/*
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* Dump an nvlist tree to dbgmsg.
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*
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* This is the zfs_dbgmsg version of userspace's dump_nvlist() from libnvpair.
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*/
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void
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__zfs_dbgmsg_nvlist(nvlist_t *nv)
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{
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int len;
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char *buf;
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len = nvlist_snprintf(NULL, 0, nv, 4);
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len++; /* Add null terminator */
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buf = vmem_alloc(len, KM_SLEEP);
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if (buf == NULL)
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return;
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(void) nvlist_snprintf(buf, len, nv, 4);
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while (buf != NULL)
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buf = zfs_dbgmsg_one_line(buf);
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vmem_free(buf, len);
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}
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#ifdef _KERNEL
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EXPORT_SYMBOL(__zfs_dbgmsg_nvlist);
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#endif
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