From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/md/dm-audit.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 drivers/md/dm-audit.c (limited to 'drivers/md/dm-audit.c') diff --git a/drivers/md/dm-audit.c b/drivers/md/dm-audit.c new file mode 100644 index 000000000..2e979eeb1 --- /dev/null +++ b/drivers/md/dm-audit.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Creating audit records for mapped devices. + * + * Copyright (C) 2021 Fraunhofer AISEC. All rights reserved. + * + * Authors: Michael Weiß + */ + +#include +#include +#include +#include +#include + +#include "dm-audit.h" +#include "dm-core.h" + +static struct audit_buffer *dm_audit_log_start(int audit_type, + const char *dm_msg_prefix, + const char *op) +{ + struct audit_buffer *ab; + + if (audit_enabled == AUDIT_OFF) + return NULL; + + ab = audit_log_start(audit_context(), GFP_KERNEL, audit_type); + if (unlikely(!ab)) + return NULL; + + audit_log_format(ab, "module=%s op=%s", dm_msg_prefix, op); + return ab; +} + +void dm_audit_log_ti(int audit_type, const char *dm_msg_prefix, const char *op, + struct dm_target *ti, int result) +{ + struct audit_buffer *ab = NULL; + struct mapped_device *md = dm_table_get_md(ti->table); + int dev_major = dm_disk(md)->major; + int dev_minor = dm_disk(md)->first_minor; + + switch (audit_type) { + case AUDIT_DM_CTRL: + ab = dm_audit_log_start(audit_type, dm_msg_prefix, op); + if (unlikely(!ab)) + return; + audit_log_task_info(ab); + audit_log_format(ab, " dev=%d:%d error_msg='%s'", dev_major, + dev_minor, !result ? ti->error : "success"); + break; + case AUDIT_DM_EVENT: + ab = dm_audit_log_start(audit_type, dm_msg_prefix, op); + if (unlikely(!ab)) + return; + audit_log_format(ab, " dev=%d:%d sector=?", dev_major, + dev_minor); + break; + default: /* unintended use */ + return; + } + + audit_log_format(ab, " res=%d", result); + audit_log_end(ab); +} +EXPORT_SYMBOL_GPL(dm_audit_log_ti); + +void dm_audit_log_bio(const char *dm_msg_prefix, const char *op, + struct bio *bio, sector_t sector, int result) +{ + struct audit_buffer *ab; + int dev_major = MAJOR(bio->bi_bdev->bd_dev); + int dev_minor = MINOR(bio->bi_bdev->bd_dev); + + ab = dm_audit_log_start(AUDIT_DM_EVENT, dm_msg_prefix, op); + if (unlikely(!ab)) + return; + + audit_log_format(ab, " dev=%d:%d sector=%llu res=%d", + dev_major, dev_minor, sector, result); + audit_log_end(ab); +} +EXPORT_SYMBOL_GPL(dm_audit_log_bio); -- cgit v1.3.1