The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/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 */

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