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/*
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SPL_KMEM_H
#define _SPL_KMEM_H
#include <sys/debug.h>
#include <linux/slab.h>
#include <linux/sched.h>
extern int kmem_debugging(void);
extern char *kmem_vasprintf(const char *fmt, va_list ap);
extern char *kmem_asprintf(const char *fmt, ...);
extern char *strdup(const char *str);
extern void strfree(char *str);
/*
* Memory allocation interfaces
*/
#define KM_SLEEP 0x0000 /* can block for memory; success guaranteed */
#define KM_NOSLEEP 0x0001 /* cannot block for memory; may fail */
#define KM_PUSHPAGE 0x0004 /* can block for memory; may use reserve */
#define KM_ZERO 0x1000 /* zero the allocation */
#define KM_VMEM 0x2000 /* caller is vmem_* wrapper */
#define KM_PUBLIC_MASK (KM_SLEEP | KM_NOSLEEP | KM_PUSHPAGE)
static int spl_fstrans_check(void);
/*
* Convert a KM_* flags mask to its Linux GFP_* counterpart. The conversion
* function is context aware which means that KM_SLEEP allocations can be
* safely used in syncing contexts which have set PF_FSTRANS.
*/
static inline gfp_t
kmem_flags_convert(int flags)
{
gfp_t lflags = __GFP_NOWARN | __GFP_COMP;
if (flags & KM_NOSLEEP) {
lflags |= GFP_ATOMIC | __GFP_NORETRY;
} else {
lflags |= GFP_KERNEL;
if (spl_fstrans_check())
lflags &= ~(__GFP_IO|__GFP_FS);
}
if (flags & KM_PUSHPAGE)
lflags |= __GFP_HIGH;
if (flags & KM_ZERO)
lflags |= __GFP_ZERO;
return (lflags);
}
typedef struct {
struct task_struct *fstrans_thread;
unsigned int saved_flags;
} fstrans_cookie_t;
/*
* Introduced in Linux 3.9, however this cannot be solely relied on before
* Linux 3.18 as it doesn't turn off __GFP_FS as it should.
*/
#ifdef PF_MEMALLOC_NOIO
#define __SPL_PF_MEMALLOC_NOIO (PF_MEMALLOC_NOIO)
#else
#define __SPL_PF_MEMALLOC_NOIO (0)
#endif
/*
* PF_FSTRANS is removed from Linux 4.12
*/
#ifdef PF_FSTRANS
#define __SPL_PF_FSTRANS (PF_FSTRANS)
#else
#define __SPL_PF_FSTRANS (0)
#endif
#define SPL_FSTRANS (__SPL_PF_FSTRANS|__SPL_PF_MEMALLOC_NOIO)
static inline fstrans_cookie_t
spl_fstrans_mark(void)
{
fstrans_cookie_t cookie;
BUILD_BUG_ON(SPL_FSTRANS == 0);
cookie.fstrans_thread = current;
cookie.saved_flags = current->flags & SPL_FSTRANS;
current->flags |= SPL_FSTRANS;
return (cookie);
}
static inline void
spl_fstrans_unmark(fstrans_cookie_t cookie)
{
ASSERT3P(cookie.fstrans_thread, ==, current);
ASSERT((current->flags & SPL_FSTRANS) == SPL_FSTRANS);
current->flags &= ~SPL_FSTRANS;
current->flags |= cookie.saved_flags;
}
static inline int
spl_fstrans_check(void)
{
return (current->flags & SPL_FSTRANS);
}
/*
* specifically used to check PF_FSTRANS flag, cannot be relied on for
* checking spl_fstrans_mark().
*/
static inline int
__spl_pf_fstrans_check(void)
{
return (current->flags & __SPL_PF_FSTRANS);
}
#ifdef HAVE_ATOMIC64_T
#define kmem_alloc_used_add(size) atomic64_add(size, &kmem_alloc_used)
#define kmem_alloc_used_sub(size) atomic64_sub(size, &kmem_alloc_used)
#define kmem_alloc_used_read() atomic64_read(&kmem_alloc_used)
#define kmem_alloc_used_set(size) atomic64_set(&kmem_alloc_used, size)
extern atomic64_t kmem_alloc_used;
extern unsigned long long kmem_alloc_max;
#else /* HAVE_ATOMIC64_T */
#define kmem_alloc_used_add(size) atomic_add(size, &kmem_alloc_used)
#define kmem_alloc_used_sub(size) atomic_sub(size, &kmem_alloc_used)
#define kmem_alloc_used_read() atomic_read(&kmem_alloc_used)
#define kmem_alloc_used_set(size) atomic_set(&kmem_alloc_used, size)
extern atomic_t kmem_alloc_used;
extern unsigned long long kmem_alloc_max;
#endif /* HAVE_ATOMIC64_T */
extern unsigned int spl_kmem_alloc_warn;
extern unsigned int spl_kmem_alloc_max;
#define kmem_alloc(sz, fl) spl_kmem_alloc((sz), (fl), __func__, __LINE__)
#define kmem_zalloc(sz, fl) spl_kmem_zalloc((sz), (fl), __func__, __LINE__)
#define kmem_free(ptr, sz) spl_kmem_free((ptr), (sz))
extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line);
extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line);
extern void spl_kmem_free(const void *ptr, size_t sz);
/*
* The following functions are only available for internal use.
*/
extern void *spl_kmem_alloc_impl(size_t size, int flags, int node);
extern void *spl_kmem_alloc_debug(size_t size, int flags, int node);
extern void *spl_kmem_alloc_track(size_t size, int flags,
const char *func, int line, int node);
extern void spl_kmem_free_impl(const void *buf, size_t size);
extern void spl_kmem_free_debug(const void *buf, size_t size);
extern void spl_kmem_free_track(const void *buf, size_t size);
extern int spl_kmem_init(void);
extern void spl_kmem_fini(void);
#endif /* _SPL_KMEM_H */
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