2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
9 * For details, see <http://zfsonlinux.org/>.
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
28 #include <sys/debug.h>
29 #include <linux/slab.h>
30 #include <linux/sched.h>
32 extern int kmem_debugging(void);
33 extern char *kmem_vasprintf(const char *fmt
, va_list ap
);
34 extern char *kmem_asprintf(const char *fmt
, ...);
35 extern char *strdup(const char *str
);
36 extern void strfree(char *str
);
39 * Memory allocation interfaces
41 #define KM_SLEEP 0x0000 /* can block for memory; success guaranteed */
42 #define KM_NOSLEEP 0x0001 /* cannot block for memory; may fail */
43 #define KM_PUSHPAGE 0x0004 /* can block for memory; may use reserve */
44 #define KM_ZERO 0x1000 /* zero the allocation */
45 #define KM_VMEM 0x2000 /* caller is vmem_* wrapper */
47 #define KM_PUBLIC_MASK (KM_SLEEP | KM_NOSLEEP | KM_PUSHPAGE)
50 * Convert a KM_* flags mask to its Linux GFP_* counterpart. The conversion
51 * function is context aware which means that KM_SLEEP allocations can be
52 * safely used in syncing contexts which have set PF_FSTRANS.
55 kmem_flags_convert(int flags
)
57 gfp_t lflags
= __GFP_NOWARN
| __GFP_COMP
;
59 if (flags
& KM_NOSLEEP
) {
60 lflags
|= GFP_ATOMIC
| __GFP_NORETRY
;
63 if ((current
->flags
& PF_FSTRANS
))
64 lflags
&= ~(__GFP_IO
|__GFP_FS
);
67 if (flags
& KM_PUSHPAGE
)
77 struct task_struct
*fstrans_thread
;
78 unsigned int saved_flags
;
81 static inline fstrans_cookie_t
82 spl_fstrans_mark(void)
84 fstrans_cookie_t cookie
;
86 cookie
.fstrans_thread
= current
;
87 cookie
.saved_flags
= current
->flags
& PF_FSTRANS
;
88 current
->flags
|= PF_FSTRANS
;
94 spl_fstrans_unmark(fstrans_cookie_t cookie
)
96 ASSERT3P(cookie
.fstrans_thread
, ==, current
);
97 ASSERT(current
->flags
& PF_FSTRANS
);
99 current
->flags
&= ~(PF_FSTRANS
);
100 current
->flags
|= cookie
.saved_flags
;
104 spl_fstrans_check(void)
106 return (current
->flags
& PF_FSTRANS
);
109 #ifdef HAVE_ATOMIC64_T
110 #define kmem_alloc_used_add(size) atomic64_add(size, &kmem_alloc_used)
111 #define kmem_alloc_used_sub(size) atomic64_sub(size, &kmem_alloc_used)
112 #define kmem_alloc_used_read() atomic64_read(&kmem_alloc_used)
113 #define kmem_alloc_used_set(size) atomic64_set(&kmem_alloc_used, size)
114 extern atomic64_t kmem_alloc_used
;
115 extern unsigned long long kmem_alloc_max
;
116 #else /* HAVE_ATOMIC64_T */
117 #define kmem_alloc_used_add(size) atomic_add(size, &kmem_alloc_used)
118 #define kmem_alloc_used_sub(size) atomic_sub(size, &kmem_alloc_used)
119 #define kmem_alloc_used_read() atomic_read(&kmem_alloc_used)
120 #define kmem_alloc_used_set(size) atomic_set(&kmem_alloc_used, size)
121 extern atomic_t kmem_alloc_used
;
122 extern unsigned long long kmem_alloc_max
;
123 #endif /* HAVE_ATOMIC64_T */
125 extern unsigned int spl_kmem_alloc_warn
;
126 extern unsigned int spl_kmem_alloc_max
;
128 #define kmem_alloc(sz, fl) spl_kmem_alloc((sz), (fl), __func__, __LINE__)
129 #define kmem_zalloc(sz, fl) spl_kmem_zalloc((sz), (fl), __func__, __LINE__)
130 #define kmem_free(ptr, sz) spl_kmem_free((ptr), (sz))
132 extern void *spl_kmem_alloc(size_t sz
, int fl
, const char *func
, int line
);
133 extern void *spl_kmem_zalloc(size_t sz
, int fl
, const char *func
, int line
);
134 extern void spl_kmem_free(const void *ptr
, size_t sz
);
137 * The following functions are only available for internal use.
139 extern void *spl_kmem_alloc_impl(size_t size
, int flags
, int node
);
140 extern void *spl_kmem_alloc_debug(size_t size
, int flags
, int node
);
141 extern void *spl_kmem_alloc_track(size_t size
, int flags
,
142 const char *func
, int line
, int node
);
143 extern void spl_kmem_free_impl(const void *buf
, size_t size
);
144 extern void spl_kmem_free_debug(const void *buf
, size_t size
);
145 extern void spl_kmem_free_track(const void *buf
, size_t size
);
147 extern int spl_kmem_init(void);
148 extern void spl_kmem_fini(void);
150 #endif /* _SPL_KMEM_H */