FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/malloc.h

     /*
      * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
      *
      * Copyright (c) 2001-2005 Anton Altaparmakov
      *
      * This program/include file is free software; you can redistribute it and/or
      * modify it under the terms of the GNU General Public License as published
      * by the Free Software Foundation; either version 2 of the License, or
      * (at your option) any later version.
     *
     * This program/include file is distributed in the hope that it will be
     * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
     * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program (in the main directory of the Linux-NTFS
     * distribution in the file COPYING); if not, write to the Free Software
     * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     */
    
    #ifndef _LINUX_NTFS_MALLOC_H
    #define _LINUX_NTFS_MALLOC_H
    
    #include <linux/vmalloc.h>
    #include <linux/slab.h>
    #include <linux/highmem.h>
    
    /**
     * __ntfs_malloc - allocate memory in multiples of pages
     * @size:       number of bytes to allocate
     * @gfp_mask:   extra flags for the allocator
     *
     * Internal function.  You probably want ntfs_malloc_nofs()...
     *
     * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
     * returns a pointer to the allocated memory.
     *
     * If there was insufficient memory to complete the request, return NULL.
     * Depending on @gfp_mask the allocation may be guaranteed to succeed.
     */
    static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
    {
            if (likely(size <= PAGE_SIZE)) {
                    BUG_ON(!size);
                    /* kmalloc() has per-CPU caches so is faster for now. */
                    return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
                    /* return (void *)__get_free_page(gfp_mask); */
            }
            if (likely((size >> PAGE_SHIFT) < totalram_pages))
                    return __vmalloc(size, gfp_mask, PAGE_KERNEL);
            return NULL;
    }
    
    /**
     * ntfs_malloc_nofs - allocate memory in multiples of pages
     * @size:       number of bytes to allocate
     *
     * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
     * returns a pointer to the allocated memory.
     *
     * If there was insufficient memory to complete the request, return NULL.
     */
    static inline void *ntfs_malloc_nofs(unsigned long size)
    {
            return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
    }
    
    /**
     * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
     * @size:       number of bytes to allocate
     *
     * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
     * returns a pointer to the allocated memory.
     *
     * This function guarantees that the allocation will succeed.  It will sleep
     * for as long as it takes to complete the allocation.
     *
     * If there was insufficient memory to complete the request, return NULL.
     */
    static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
    {
            return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
    }
    
    static inline void ntfs_free(void *addr)
    {
            if (!is_vmalloc_addr(addr)) {
                    kfree(addr);
                    /* free_page((unsigned long)addr); */
                    return;
            }
            vfree(addr);
    }
    
    #endif /* _LINUX_NTFS_MALLOC_H */

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