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 kvfree(addr); 89 } 90 91 #endif /* _LINUX_NTFS_MALLOC_H */ 92