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dbf6108b4d
Implement support for Linux's RENAME_* flags (for renameat2). Aside from being quite useful for userspace (providing race-free ways to exchange paths and implement mv --no-clobber), they are used by overlayfs and are thus required in order to use overlayfs-on-ZFS. In order for us to represent the new renameat2(2) flags in the ZIL, we create two new transaction types for the two flags which need transactional-level support (RENAME_EXCHANGE and RENAME_WHITEOUT). RENAME_NOREPLACE does not need any ZIL support because we know that if the operation succeeded before creating the ZIL entry, there was no file to be clobbered and thus it can be treated as a regular TX_RENAME. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Pavel Snajdr <snajpa@snajpa.net> Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> Closes #12209 Closes #14070
216 lines
5.9 KiB
C
216 lines
5.9 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SPL_SYSMACROS_H
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#define _SPL_SYSMACROS_H
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/sched/rt.h>
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#include <linux/cpumask.h>
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#include <sys/debug.h>
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#include <sys/zone.h>
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#include <sys/signal.h>
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#include <asm/page.h>
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#ifndef _KERNEL
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#define _KERNEL __KERNEL__
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#endif
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#define FALSE 0
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#define TRUE 1
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#define INT8_MAX (127)
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#define INT8_MIN (-128)
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#define UINT8_MAX (255)
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#define UINT8_MIN (0)
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#define INT16_MAX (32767)
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#define INT16_MIN (-32768)
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#define UINT16_MAX (65535)
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#define UINT16_MIN (0)
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#define INT32_MAX INT_MAX
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#define INT32_MIN INT_MIN
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#define UINT32_MAX UINT_MAX
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#define UINT32_MIN UINT_MIN
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#define INT64_MAX LLONG_MAX
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#define INT64_MIN LLONG_MIN
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#define UINT64_MAX ULLONG_MAX
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#define UINT64_MIN ULLONG_MIN
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#define NBBY 8
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#define MAXMSGLEN 256
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#define MAXNAMELEN 256
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#define MAXPATHLEN 4096
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#define MAXOFFSET_T LLONG_MAX
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#define MAXBSIZE 8192
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#define DEV_BSIZE 512
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#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#define proc_pageout NULL
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#define curproc current
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#define max_ncpus num_possible_cpus()
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#define boot_ncpus num_online_cpus()
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#define CPU_SEQID smp_processor_id()
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#define CPU_SEQID_UNSTABLE raw_smp_processor_id()
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#define is_system_labeled() 0
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#ifndef RLIM64_INFINITY
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#define RLIM64_INFINITY (~0ULL)
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#endif
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/*
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* 0..MAX_PRIO-1: Process priority
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* 0..MAX_RT_PRIO-1: RT priority tasks
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* MAX_RT_PRIO..MAX_PRIO-1: SCHED_NORMAL tasks
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*
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* Treat shim tasks as SCHED_NORMAL tasks
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*/
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#define minclsyspri (MAX_PRIO-1)
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#define maxclsyspri (MAX_RT_PRIO)
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#define defclsyspri (DEFAULT_PRIO)
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#ifndef NICE_TO_PRIO
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#define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20)
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#endif
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#ifndef PRIO_TO_NICE
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#define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20)
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#endif
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/*
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* Missing macros
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*/
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#ifndef PAGESIZE
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#define PAGESIZE PAGE_SIZE
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#endif
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#ifndef PAGESHIFT
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#define PAGESHIFT PAGE_SHIFT
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#endif
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/* Missing globals */
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extern unsigned long spl_hostid;
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/* Missing misc functions */
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extern uint32_t zone_get_hostid(void *zone);
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extern void spl_setup(void);
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extern void spl_cleanup(void);
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/*
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* Only handles the first 4096 majors and first 256 minors. We don't have a
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* libc for the kernel module so we define this inline.
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*/
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static inline dev_t
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makedev(unsigned int major, unsigned int minor)
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{
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return ((major & 0xFFF) << 8) | (minor & 0xFF);
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}
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#define highbit(x) __fls(x)
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#define lowbit(x) __ffs(x)
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#define highbit64(x) fls64(x)
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#define makedevice(maj, min) makedev(maj, min)
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/* common macros */
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#ifndef MIN
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#endif
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#ifndef MAX
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#define MAX(a, b) ((a) < (b) ? (b) : (a))
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#endif
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#ifndef ABS
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#define ABS(a) ((a) < 0 ? -(a) : (a))
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#endif
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#ifndef DIV_ROUND_UP
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#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
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#endif
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#ifndef roundup
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#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
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#endif
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#ifndef howmany
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#define howmany(x, y) (((x) + ((y) - 1)) / (y))
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#endif
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/*
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* Compatibility macros/typedefs needed for Solaris -> Linux port
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*/
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#define P2ALIGN(x, align) ((x) & -(align))
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#define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
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#define P2ROUNDUP(x, align) ((((x) - 1) | ((align) - 1)) + 1)
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#define P2PHASE(x, align) ((x) & ((align) - 1))
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#define P2NPHASE(x, align) (-(x) & ((align) - 1))
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#define ISP2(x) (((x) & ((x) - 1)) == 0)
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#define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
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#define P2BOUNDARY(off, len, align) \
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(((off) ^ ((off) + (len) - 1)) > (align) - 1)
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/*
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* Typed version of the P2* macros. These macros should be used to ensure
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* that the result is correctly calculated based on the data type of (x),
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* which is passed in as the last argument, regardless of the data
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* type of the alignment. For example, if (x) is of type uint64_t,
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* and we want to round it up to a page boundary using "PAGESIZE" as
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* the alignment, we can do either
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*
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* P2ROUNDUP(x, (uint64_t)PAGESIZE)
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* or
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* P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
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*/
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#define P2ALIGN_TYPED(x, align, type) \
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((type)(x) & -(type)(align))
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#define P2PHASE_TYPED(x, align, type) \
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((type)(x) & ((type)(align) - 1))
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#define P2NPHASE_TYPED(x, align, type) \
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(-(type)(x) & ((type)(align) - 1))
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#define P2ROUNDUP_TYPED(x, align, type) \
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((((type)(x) - 1) | ((type)(align) - 1)) + 1)
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#define P2END_TYPED(x, align, type) \
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(-(~(type)(x) & -(type)(align)))
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#define P2PHASEUP_TYPED(x, align, phase, type) \
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((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
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#define P2CROSS_TYPED(x, y, align, type) \
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(((type)(x) ^ (type)(y)) > (type)(align) - 1)
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#define P2SAMEHIGHBIT_TYPED(x, y, type) \
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(((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
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#define SET_ERROR(err) \
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(__set_error(__FILE__, __func__, __LINE__, err), err)
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#include <linux/sort.h>
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#define qsort(base, num, size, cmp) \
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sort(base, num, size, cmp, NULL)
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#if !defined(_KMEMUSER) && !defined(offsetof)
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/* avoid any possibility of clashing with <stddef.h> version */
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#define offsetof(s, m) ((size_t)(&(((s *)0)->m)))
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#endif
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#endif /* _SPL_SYSMACROS_H */
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