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TOMOYO Linux Cross Reference
Linux/fs/ntfs/malloc.h

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  1 /*
  2  * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
  3  *
  4  * Copyright (c) 2001-2005 Anton Altaparmakov
  5  *
  6  * This program/include file is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License as published
  8  * by the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program/include file is distributed in the hope that it will be
 12  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program (in the main directory of the Linux-NTFS
 18  * distribution in the file COPYING); if not, write to the Free Software
 19  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20  */
 21 
 22 #ifndef _LINUX_NTFS_MALLOC_H
 23 #define _LINUX_NTFS_MALLOC_H
 24 
 25 #include <linux/vmalloc.h>
 26 #include <linux/slab.h>
 27 #include <linux/highmem.h>
 28 
 29 /**
 30  * __ntfs_malloc - allocate memory in multiples of pages
 31  * @size:       number of bytes to allocate
 32  * @gfp_mask:   extra flags for the allocator
 33  *
 34  * Internal function.  You probably want ntfs_malloc_nofs()...
 35  *
 36  * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
 37  * returns a pointer to the allocated memory.
 38  *
 39  * If there was insufficient memory to complete the request, return NULL.
 40  * Depending on @gfp_mask the allocation may be guaranteed to succeed.
 41  */
 42 static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
 43 {
 44         if (likely(size <= PAGE_SIZE)) {
 45                 BUG_ON(!size);
 46                 /* kmalloc() has per-CPU caches so is faster for now. */
 47                 return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
 48                 /* return (void *)__get_free_page(gfp_mask); */
 49         }
 50         if (likely((size >> PAGE_SHIFT) < totalram_pages))
 51                 return __vmalloc(size, gfp_mask, PAGE_KERNEL);
 52         return NULL;
 53 }
 54 
 55 /**
 56  * ntfs_malloc_nofs - allocate memory in multiples of pages
 57  * @size:       number of bytes to allocate
 58  *
 59  * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
 60  * returns a pointer to the allocated memory.
 61  *
 62  * If there was insufficient memory to complete the request, return NULL.
 63  */
 64 static inline void *ntfs_malloc_nofs(unsigned long size)
 65 {
 66         return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
 67 }
 68 
 69 /**
 70  * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
 71  * @size:       number of bytes to allocate
 72  *
 73  * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
 74  * returns a pointer to the allocated memory.
 75  *
 76  * This function guarantees that the allocation will succeed.  It will sleep
 77  * for as long as it takes to complete the allocation.
 78  *
 79  * If there was insufficient memory to complete the request, return NULL.
 80  */
 81 static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
 82 {
 83         return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
 84 }
 85 
 86 static inline void ntfs_free(void *addr)
 87 {
 88         if (!is_vmalloc_addr(addr)) {
 89                 kfree(addr);
 90                 /* free_page((unsigned long)addr); */
 91                 return;
 92         }
 93         vfree(addr);
 94 }
 95 
 96 #endif /* _LINUX_NTFS_MALLOC_H */
 97 

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