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Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include <linux/mm.h> |
1da177e4 | 19 | #include <linux/highmem.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
1da177e4 LT |
21 | #include <linux/swap.h> |
22 | #include <linux/blkdev.h> | |
3fcfab16 | 23 | #include <linux/backing-dev.h> |
1da177e4 LT |
24 | #include "time.h" |
25 | #include "kmem.h" | |
26 | ||
bdfb0430 CH |
27 | /* |
28 | * Greedy allocation. May fail and may return vmalloced memory. | |
29 | * | |
30 | * Must be freed using kmem_free_large. | |
31 | */ | |
32 | void * | |
33 | kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize) | |
34 | { | |
35 | void *ptr; | |
36 | size_t kmsize = maxsize; | |
37 | ||
38 | while (!(ptr = kmem_zalloc_large(kmsize))) { | |
39 | if ((kmsize >>= 1) <= minsize) | |
40 | kmsize = minsize; | |
41 | } | |
42 | if (ptr) | |
43 | *size = kmsize; | |
44 | return ptr; | |
45 | } | |
1da177e4 | 46 | |
1da177e4 | 47 | void * |
27496a8c | 48 | kmem_alloc(size_t size, unsigned int __nocast flags) |
1da177e4 | 49 | { |
27496a8c AV |
50 | int retries = 0; |
51 | gfp_t lflags = kmem_flags_convert(flags); | |
52 | void *ptr; | |
1da177e4 LT |
53 | |
54 | do { | |
bdfb0430 | 55 | ptr = kmalloc(size, lflags); |
1da177e4 LT |
56 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) |
57 | return ptr; | |
58 | if (!(++retries % 100)) | |
59 | printk(KERN_ERR "XFS: possible memory allocation " | |
60 | "deadlock in %s (mode:0x%x)\n", | |
34a622b2 | 61 | __func__, lflags); |
8aa7e847 | 62 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
63 | } while (1); |
64 | } | |
65 | ||
66 | void * | |
27496a8c | 67 | kmem_zalloc(size_t size, unsigned int __nocast flags) |
1da177e4 LT |
68 | { |
69 | void *ptr; | |
70 | ||
71 | ptr = kmem_alloc(size, flags); | |
72 | if (ptr) | |
73 | memset((char *)ptr, 0, (int)size); | |
74 | return ptr; | |
75 | } | |
76 | ||
77 | void | |
d3689d76 | 78 | kmem_free(const void *ptr) |
1da177e4 | 79 | { |
9e2779fa | 80 | if (!is_vmalloc_addr(ptr)) { |
1da177e4 LT |
81 | kfree(ptr); |
82 | } else { | |
83 | vfree(ptr); | |
84 | } | |
85 | } | |
86 | ||
87 | void * | |
d3689d76 | 88 | kmem_realloc(const void *ptr, size_t newsize, size_t oldsize, |
27496a8c | 89 | unsigned int __nocast flags) |
1da177e4 LT |
90 | { |
91 | void *new; | |
92 | ||
93 | new = kmem_alloc(newsize, flags); | |
94 | if (ptr) { | |
95 | if (new) | |
96 | memcpy(new, ptr, | |
97 | ((oldsize < newsize) ? oldsize : newsize)); | |
f0e2d93c | 98 | kmem_free(ptr); |
1da177e4 LT |
99 | } |
100 | return new; | |
101 | } | |
102 | ||
103 | void * | |
27496a8c | 104 | kmem_zone_alloc(kmem_zone_t *zone, unsigned int __nocast flags) |
1da177e4 | 105 | { |
27496a8c AV |
106 | int retries = 0; |
107 | gfp_t lflags = kmem_flags_convert(flags); | |
108 | void *ptr; | |
1da177e4 LT |
109 | |
110 | do { | |
111 | ptr = kmem_cache_alloc(zone, lflags); | |
112 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) | |
113 | return ptr; | |
114 | if (!(++retries % 100)) | |
115 | printk(KERN_ERR "XFS: possible memory allocation " | |
116 | "deadlock in %s (mode:0x%x)\n", | |
34a622b2 | 117 | __func__, lflags); |
8aa7e847 | 118 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
119 | } while (1); |
120 | } | |
121 | ||
122 | void * | |
27496a8c | 123 | kmem_zone_zalloc(kmem_zone_t *zone, unsigned int __nocast flags) |
1da177e4 LT |
124 | { |
125 | void *ptr; | |
126 | ||
127 | ptr = kmem_zone_alloc(zone, flags); | |
128 | if (ptr) | |
129 | memset((char *)ptr, 0, kmem_cache_size(zone)); | |
130 | return ptr; | |
131 | } |