188 lines
5.6 KiB
C
188 lines
5.6 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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* For details, see <http://zfsonlinux.org/>.
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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_KMEM_H
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#define _SPL_KMEM_H
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#include <sys/debug.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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extern int kmem_debugging(void);
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extern char *kmem_vasprintf(const char *fmt, va_list ap);
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extern char *kmem_asprintf(const char *fmt, ...);
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extern char *kmem_strdup(const char *str);
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extern void kmem_strfree(char *str);
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/*
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* Memory allocation interfaces
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*/
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#define KM_SLEEP 0x0000 /* can block for memory; success guaranteed */
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#define KM_NOSLEEP 0x0001 /* cannot block for memory; may fail */
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#define KM_PUSHPAGE 0x0004 /* can block for memory; may use reserve */
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#define KM_ZERO 0x1000 /* zero the allocation */
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#define KM_VMEM 0x2000 /* caller is vmem_* wrapper */
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#define KM_PUBLIC_MASK (KM_SLEEP | KM_NOSLEEP | KM_PUSHPAGE)
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static int spl_fstrans_check(void);
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/*
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* Convert a KM_* flags mask to its Linux GFP_* counterpart. The conversion
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* function is context aware which means that KM_SLEEP allocations can be
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* safely used in syncing contexts which have set PF_FSTRANS.
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*/
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static inline gfp_t
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kmem_flags_convert(int flags)
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{
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gfp_t lflags = __GFP_NOWARN | __GFP_COMP;
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if (flags & KM_NOSLEEP) {
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lflags |= GFP_ATOMIC | __GFP_NORETRY;
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} else {
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lflags |= GFP_KERNEL;
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if (spl_fstrans_check())
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lflags &= ~(__GFP_IO|__GFP_FS);
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}
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if (flags & KM_PUSHPAGE)
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lflags |= __GFP_HIGH;
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if (flags & KM_ZERO)
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lflags |= __GFP_ZERO;
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return (lflags);
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}
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typedef struct {
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struct task_struct *fstrans_thread;
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unsigned int saved_flags;
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} fstrans_cookie_t;
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/*
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* Introduced in Linux 3.9, however this cannot be solely relied on before
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* Linux 3.18 as it doesn't turn off __GFP_FS as it should.
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*/
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#ifdef PF_MEMALLOC_NOIO
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#define __SPL_PF_MEMALLOC_NOIO (PF_MEMALLOC_NOIO)
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#else
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#define __SPL_PF_MEMALLOC_NOIO (0)
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#endif
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/*
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* PF_FSTRANS is removed from Linux 4.12
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*/
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#ifdef PF_FSTRANS
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#define __SPL_PF_FSTRANS (PF_FSTRANS)
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#else
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#define __SPL_PF_FSTRANS (0)
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#endif
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#define SPL_FSTRANS (__SPL_PF_FSTRANS|__SPL_PF_MEMALLOC_NOIO)
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static inline fstrans_cookie_t
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spl_fstrans_mark(void)
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{
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fstrans_cookie_t cookie;
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BUILD_BUG_ON(SPL_FSTRANS == 0);
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cookie.fstrans_thread = current;
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cookie.saved_flags = current->flags & SPL_FSTRANS;
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current->flags |= SPL_FSTRANS;
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return (cookie);
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}
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static inline void
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spl_fstrans_unmark(fstrans_cookie_t cookie)
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{
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ASSERT3P(cookie.fstrans_thread, ==, current);
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ASSERT((current->flags & SPL_FSTRANS) == SPL_FSTRANS);
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current->flags &= ~SPL_FSTRANS;
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current->flags |= cookie.saved_flags;
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}
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static inline int
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spl_fstrans_check(void)
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{
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return (current->flags & SPL_FSTRANS);
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}
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/*
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* specifically used to check PF_FSTRANS flag, cannot be relied on for
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* checking spl_fstrans_mark().
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*/
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static inline int
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__spl_pf_fstrans_check(void)
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{
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return (current->flags & __SPL_PF_FSTRANS);
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}
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#ifdef HAVE_ATOMIC64_T
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#define kmem_alloc_used_add(size) atomic64_add(size, &kmem_alloc_used)
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#define kmem_alloc_used_sub(size) atomic64_sub(size, &kmem_alloc_used)
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#define kmem_alloc_used_read() atomic64_read(&kmem_alloc_used)
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#define kmem_alloc_used_set(size) atomic64_set(&kmem_alloc_used, size)
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extern atomic64_t kmem_alloc_used;
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extern unsigned long long kmem_alloc_max;
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#else /* HAVE_ATOMIC64_T */
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#define kmem_alloc_used_add(size) atomic_add(size, &kmem_alloc_used)
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#define kmem_alloc_used_sub(size) atomic_sub(size, &kmem_alloc_used)
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#define kmem_alloc_used_read() atomic_read(&kmem_alloc_used)
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#define kmem_alloc_used_set(size) atomic_set(&kmem_alloc_used, size)
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extern atomic_t kmem_alloc_used;
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extern unsigned long long kmem_alloc_max;
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#endif /* HAVE_ATOMIC64_T */
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extern unsigned int spl_kmem_alloc_warn;
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extern unsigned int spl_kmem_alloc_max;
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#define kmem_alloc(sz, fl) spl_kmem_alloc((sz), (fl), __func__, __LINE__)
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#define kmem_zalloc(sz, fl) spl_kmem_zalloc((sz), (fl), __func__, __LINE__)
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#define kmem_free(ptr, sz) spl_kmem_free((ptr), (sz))
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#define kmem_cache_reap_active spl_kmem_cache_reap_active
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extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line);
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extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line);
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extern void spl_kmem_free(const void *ptr, size_t sz);
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/*
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* The following functions are only available for internal use.
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*/
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extern void *spl_kmem_alloc_impl(size_t size, int flags, int node);
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extern void *spl_kmem_alloc_debug(size_t size, int flags, int node);
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extern void *spl_kmem_alloc_track(size_t size, int flags,
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const char *func, int line, int node);
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extern void spl_kmem_free_impl(const void *buf, size_t size);
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extern void spl_kmem_free_debug(const void *buf, size_t size);
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extern void spl_kmem_free_track(const void *buf, size_t size);
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extern int spl_kmem_init(void);
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extern void spl_kmem_fini(void);
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extern int spl_kmem_cache_reap_active(void);
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#endif /* _SPL_KMEM_H */
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