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119 lines
2.9 KiB
119 lines
2.9 KiB
/* |
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* Copyright (c) 2000-2005 Silicon Graphics, Inc. |
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* All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it would be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <linux/mm.h> |
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#include <linux/highmem.h> |
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#include <linux/slab.h> |
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#include <linux/swap.h> |
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#include <linux/blkdev.h> |
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#include <linux/backing-dev.h> |
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#include "kmem.h" |
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#include "xfs_message.h" |
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void * |
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kmem_alloc(size_t size, xfs_km_flags_t flags) |
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{ |
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int retries = 0; |
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gfp_t lflags = kmem_flags_convert(flags); |
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void *ptr; |
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do { |
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ptr = kmalloc(size, lflags); |
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if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) |
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return ptr; |
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if (!(++retries % 100)) |
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xfs_err(NULL, |
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"possible memory allocation deadlock in %s (mode:0x%x)", |
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__func__, lflags); |
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congestion_wait(BLK_RW_ASYNC, HZ/50); |
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} while (1); |
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} |
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void * |
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kmem_zalloc_large(size_t size, xfs_km_flags_t flags) |
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{ |
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unsigned noio_flag = 0; |
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void *ptr; |
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gfp_t lflags; |
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ptr = kmem_zalloc(size, flags | KM_MAYFAIL); |
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if (ptr) |
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return ptr; |
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/* |
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* __vmalloc() will allocate data pages and auxillary structures (e.g. |
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* pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context |
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* here. Hence we need to tell memory reclaim that we are in such a |
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* context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering |
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* the filesystem here and potentially deadlocking. |
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*/ |
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if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) |
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noio_flag = memalloc_noio_save(); |
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lflags = kmem_flags_convert(flags); |
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ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); |
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if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) |
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memalloc_noio_restore(noio_flag); |
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return ptr; |
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} |
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void |
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kmem_free(const void *ptr) |
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{ |
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if (!is_vmalloc_addr(ptr)) { |
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kfree(ptr); |
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} else { |
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vfree(ptr); |
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} |
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} |
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void * |
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kmem_realloc(const void *ptr, size_t newsize, size_t oldsize, |
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xfs_km_flags_t flags) |
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{ |
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void *new; |
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new = kmem_alloc(newsize, flags); |
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if (ptr) { |
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if (new) |
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memcpy(new, ptr, |
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((oldsize < newsize) ? oldsize : newsize)); |
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kmem_free(ptr); |
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} |
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return new; |
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} |
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void * |
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kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) |
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{ |
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int retries = 0; |
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gfp_t lflags = kmem_flags_convert(flags); |
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void *ptr; |
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do { |
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ptr = kmem_cache_alloc(zone, lflags); |
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if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) |
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return ptr; |
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if (!(++retries % 100)) |
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xfs_err(NULL, |
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"possible memory allocation deadlock in %s (mode:0x%x)", |
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__func__, lflags); |
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congestion_wait(BLK_RW_ASYNC, HZ/50); |
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} while (1); |
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}
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