2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
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
7 * published by the Free Software Foundation.
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.
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
19 #include <linux/highmem.h>
20 #include <linux/slab.h>
21 #include <linux/swap.h>
22 #include <linux/blkdev.h>
23 #include <linux/backing-dev.h>
25 #include "xfs_message.h"
28 * Greedy allocation. May fail and may return vmalloced memory.
31 kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
34 size_t kmsize = maxsize;
36 while (!(ptr = vzalloc(kmsize))) {
37 if ((kmsize >>= 1) <= minsize)
46 kmem_alloc(size_t size, xfs_km_flags_t flags)
49 gfp_t lflags = kmem_flags_convert(flags);
53 ptr = kmalloc(size, lflags);
54 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
56 if (!(++retries % 100))
58 "possible memory allocation deadlock in %s (mode:0x%x)",
60 congestion_wait(BLK_RW_ASYNC, HZ/50);
65 kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
67 unsigned noio_flag = 0;
71 ptr = kmem_zalloc(size, flags | KM_MAYFAIL);
76 * __vmalloc() will allocate data pages and auxillary structures (e.g.
77 * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context
78 * here. Hence we need to tell memory reclaim that we are in such a
79 * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering
80 * the filesystem here and potentially deadlocking.
82 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
83 noio_flag = memalloc_noio_save();
85 lflags = kmem_flags_convert(flags);
86 ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
88 if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
89 memalloc_noio_restore(noio_flag);
95 kmem_realloc(const void *ptr, size_t newsize, size_t oldsize,
100 new = kmem_alloc(newsize, flags);
104 ((oldsize < newsize) ? oldsize : newsize));
111 kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
114 gfp_t lflags = kmem_flags_convert(flags);
118 ptr = kmem_cache_alloc(zone, lflags);
119 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
121 if (!(++retries % 100))
123 "possible memory allocation deadlock in %s (mode:0x%x)",
125 congestion_wait(BLK_RW_ASYNC, HZ/50);