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 | 24 | #include "kmem.h" |
4f10700a | 25 | #include "xfs_message.h" |
1da177e4 | 26 | |
bdfb0430 CH |
27 | /* |
28 | * Greedy allocation. May fail and may return vmalloced memory. | |
bdfb0430 CH |
29 | */ |
30 | void * | |
31 | kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize) | |
32 | { | |
33 | void *ptr; | |
34 | size_t kmsize = maxsize; | |
35 | ||
fdd3ccee | 36 | while (!(ptr = vzalloc(kmsize))) { |
bdfb0430 CH |
37 | if ((kmsize >>= 1) <= minsize) |
38 | kmsize = minsize; | |
39 | } | |
40 | if (ptr) | |
41 | *size = kmsize; | |
42 | return ptr; | |
43 | } | |
1da177e4 | 44 | |
1da177e4 | 45 | void * |
77ba7877 | 46 | kmem_alloc(size_t size, xfs_km_flags_t flags) |
1da177e4 | 47 | { |
27496a8c AV |
48 | int retries = 0; |
49 | gfp_t lflags = kmem_flags_convert(flags); | |
50 | void *ptr; | |
1da177e4 LT |
51 | |
52 | do { | |
bdfb0430 | 53 | ptr = kmalloc(size, lflags); |
1da177e4 LT |
54 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) |
55 | return ptr; | |
56 | if (!(++retries % 100)) | |
4f10700a | 57 | xfs_err(NULL, |
847f9f68 | 58 | "%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)", |
5bf97b1c | 59 | current->comm, current->pid, |
847f9f68 | 60 | (unsigned int)size, __func__, lflags); |
8aa7e847 | 61 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
62 | } while (1); |
63 | } | |
64 | ||
fdd3ccee DC |
65 | void * |
66 | kmem_zalloc_large(size_t size, xfs_km_flags_t flags) | |
67 | { | |
ae687e58 | 68 | unsigned noio_flag = 0; |
fdd3ccee | 69 | void *ptr; |
ae687e58 | 70 | gfp_t lflags; |
fdd3ccee DC |
71 | |
72 | ptr = kmem_zalloc(size, flags | KM_MAYFAIL); | |
73 | if (ptr) | |
74 | return ptr; | |
ae687e58 DC |
75 | |
76 | /* | |
77 | * __vmalloc() will allocate data pages and auxillary structures (e.g. | |
78 | * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context | |
79 | * here. Hence we need to tell memory reclaim that we are in such a | |
80 | * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering | |
81 | * the filesystem here and potentially deadlocking. | |
82 | */ | |
83 | if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) | |
84 | noio_flag = memalloc_noio_save(); | |
85 | ||
86 | lflags = kmem_flags_convert(flags); | |
87 | ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); | |
88 | ||
89 | if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) | |
90 | memalloc_noio_restore(noio_flag); | |
91 | ||
92 | return ptr; | |
fdd3ccee DC |
93 | } |
94 | ||
1da177e4 | 95 | void * |
d3689d76 | 96 | kmem_realloc(const void *ptr, size_t newsize, size_t oldsize, |
77ba7877 | 97 | xfs_km_flags_t flags) |
1da177e4 LT |
98 | { |
99 | void *new; | |
100 | ||
101 | new = kmem_alloc(newsize, flags); | |
102 | if (ptr) { | |
103 | if (new) | |
104 | memcpy(new, ptr, | |
105 | ((oldsize < newsize) ? oldsize : newsize)); | |
f0e2d93c | 106 | kmem_free(ptr); |
1da177e4 LT |
107 | } |
108 | return new; | |
109 | } | |
110 | ||
111 | void * | |
77ba7877 | 112 | kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) |
1da177e4 | 113 | { |
27496a8c AV |
114 | int retries = 0; |
115 | gfp_t lflags = kmem_flags_convert(flags); | |
116 | void *ptr; | |
1da177e4 LT |
117 | |
118 | do { | |
119 | ptr = kmem_cache_alloc(zone, lflags); | |
120 | if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) | |
121 | return ptr; | |
122 | if (!(++retries % 100)) | |
4f10700a | 123 | xfs_err(NULL, |
5bf97b1c TH |
124 | "%s(%u) possible memory allocation deadlock in %s (mode:0x%x)", |
125 | current->comm, current->pid, | |
126 | __func__, lflags); | |
8aa7e847 | 127 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
128 | } while (1); |
129 | } |