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eb9098ed47
Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <robn@despairlabs.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
59 lines
2.0 KiB
C
59 lines
2.0 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) 2023, 2024, Klara Inc.
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* Copyright (c) 2024, Rob Norris <robn@despairlabs.com>
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*/
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#ifndef _ZFS_MM_COMPAT_H
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#define _ZFS_MM_COMPAT_H
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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/* 5.4 introduced page_size(). Older kernels can use a trivial macro instead */
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#ifndef HAVE_MM_PAGE_SIZE
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#define page_size(p) ((unsigned long)(PAGE_SIZE << compound_order(p)))
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#endif
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/* 6.11 removed page_mapping(). A simple wrapper around folio_mapping() works */
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#ifndef HAVE_MM_PAGE_MAPPING
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#define page_mapping(p) folio_mapping(page_folio(p))
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#endif
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/*
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* 6.12 removed PG_error, SetPageError and ClearPageError, with no direct
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* replacement, because page writeback errors are recorded elsewhere. Since we
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* only use the page cache to assist with mmap(), never directly backing it
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* with IO, it shouldn't be possible for this condition to occur on our pages
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* anyway, even if this is the right way to report it. So it should be safe
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* to remove, but for avoidance of doubt, we make it a no-op on 6.12 and leave
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* it for everything else.
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*/
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#ifndef HAVE_MM_PAGE_FLAG_ERROR
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#define SetPageError(p) do {} while (0)
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#define ClearPageError(p) do {} while (0)
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#endif
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#endif /* _ZFS_MM_COMPAT_H */
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