2 * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
4 * Copyright (c) 2001-2005 Anton Altaparmakov
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.
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.
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
22 #ifndef _LINUX_NTFS_MALLOC_H
23 #define _LINUX_NTFS_MALLOC_H
25 #include <linux/vmalloc.h>
26 #include <linux/slab.h>
27 #include <linux/highmem.h>
30 * __ntfs_malloc - allocate memory in multiples of pages
31 * @size: number of bytes to allocate
32 * @gfp_mask: extra flags for the allocator
34 * Internal function. You probably want ntfs_malloc_nofs()...
36 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
37 * returns a pointer to the allocated memory.
39 * If there was insufficient memory to complete the request, return NULL.
40 * Depending on @gfp_mask the allocation may be guaranteed to succeed.
42 static inline void *__ntfs_malloc(unsigned long size
, gfp_t gfp_mask
)
44 if (likely(size
<= PAGE_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); */
50 if (likely(size
>> PAGE_SHIFT
< num_physpages
))
51 return __vmalloc(size
, gfp_mask
, PAGE_KERNEL
);
56 * ntfs_malloc_nofs - allocate memory in multiples of pages
57 * @size: number of bytes to allocate
59 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
60 * returns a pointer to the allocated memory.
62 * If there was insufficient memory to complete the request, return NULL.
64 static inline void *ntfs_malloc_nofs(unsigned long size
)
66 return __ntfs_malloc(size
, GFP_NOFS
| __GFP_HIGHMEM
);
70 * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
71 * @size: number of bytes to allocate
73 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
74 * returns a pointer to the allocated memory.
76 * This function guarantees that the allocation will succeed. It will sleep
77 * for as long as it takes to complete the allocation.
79 * If there was insufficient memory to complete the request, return NULL.
81 static inline void *ntfs_malloc_nofs_nofail(unsigned long size
)
83 return __ntfs_malloc(size
, GFP_NOFS
| __GFP_HIGHMEM
| __GFP_NOFAIL
);
86 static inline void ntfs_free(void *addr
)
88 if (!is_vmalloc_addr(addr
)) {
90 /* free_page((unsigned long)addr); */
96 #endif /* _LINUX_NTFS_MALLOC_H */
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